!IFNDEF SQLITE3H
SQLITE3H = sqlite3.h
!ENDIF

# This is the name to use for the SQLite dynamic link library (DLL).
#
!IFNDEF SQLITE3DLL



SQLITE3DLL = sqlite3.dll

!ENDIF

# This is the name to use for the SQLite import library (LIB).
#
!IFNDEF SQLITE3LIB



SQLITE3LIB = sqlite3.lib

!ENDIF

# This is the name to use for the SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXE



SQLITE3EXE = sqlite3.exe

!ENDIF

# This is the argument used to set the program database (PDB) file for the
# SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXEPDB



SQLITE3EXEPDB = /pdb:sqlite3sh.pdb

!ENDIF

# These are the "standard" SQLite compilation options used when compiling for
# the Windows platform.
#
!IFNDEF OPT_FEATURE_FLAGS
OPT_FEATURE_FLAGS = $(OPT_FEATURE_FLAGS) -DSQLITE_ENABLE_FTS3=1
................................................................................
!ELSE
TCC = $(CC) -nologo -W3 $(CCOPTS) $(TCCOPTS)
!ENDIF

TCC = $(TCC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) -I$(TOP)\src -fp:precise
RCC = $(RC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) -I$(TOP)\src $(RCOPTS) $(RCCOPTS)

# Adjust the names of the primary targets for use with Windows 10.
#
!IF $(FOR_WIN10)!=0
SQLITE3DLL = winsqlite3.dll
SQLITE3LIB = winsqlite3.lib
SQLITE3EXE = winsqlite3shell.exe
SQLITE3EXEPDB =
!ENDIF

# Check if we want to use the "stdcall" calling convention when compiling.
# This is not supported by the compilers for non-x86 platforms.  It should
# also be noted here that building any target with these "stdcall" options
# will most likely fail if the Tcl library is also required.  This is due
# to how the Tcl library functions are declared and exported (i.e. without
# an explicit calling convention, which results in "cdecl").
#
................................................................................
#
dll: $(SQLITE3DLL)

# Shell executable.
#
shell: $(SQLITE3EXE)


libsqlite3.lib:	$(LIBOBJ)
	$(LTLIB) $(LTLIBOPTS) /OUT:$@ $(LIBOBJ) $(TLIBS)

# <<mark>>
libtclsqlite3.lib:	tclsqlite.lo libsqlite3.lib
	$(LTLIB) $(LTLIBOPTS) $(LTLIBPATHS) /OUT:$@ tclsqlite.lo libsqlite3.lib $(LIBTCLSTUB) $(TLIBS)
# <</mark>>

$(SQLITE3DLL): $(LIBOBJ) $(LIBRESOBJS) $(CORE_LINK_DEP)
	$(LD) $(LDFLAGS) $(LTLINKOPTS) $(LTLIBPATHS) /DLL $(CORE_LINK_OPTS) /OUT:$@ $(LIBOBJ) $(LIBRESOBJS) $(LTLIBS) $(TLIBS)

................................................................................
rbu.exe: $(TOP)\ext\rbu\rbu.c $(TOP)\ext\rbu\sqlite3rbu.c $(SQLITE3C) $(SQLITE3H)
	$(LTLINK) $(NO_WARN) -DSQLITE_ENABLE_RBU -Fe$@ \
		$(TOP)\ext\rbu\rbu.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)
# <</mark>>

clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.cod *.da *.bb *.bbg *.vc gmon.out 2>NUL

# <<mark>>
	del /Q $(SQLITE3C) $(SQLITE3H) opcodes.c opcodes.h 2>NUL
	del /Q lemon.* lempar.c parse.* 2>NUL
	del /Q mkkeywordhash.* keywordhash.h 2>NUL
	del /Q notasharedlib.* 2>NUL
	-rmdir /Q/S .deps 2>NUL
	-rmdir /Q/S .libs 2>NUL
................................................................................
	del /Q tclsqlite3.exe 2>NUL
	del /Q testloadext.dll 2>NUL
	del /Q testfixture.exe test.db 2>NUL
	del /Q LogEst.exe fts3view.exe rollback-test.exe showdb.exe 2>NUL
	del /Q changeset.exe 2>NUL
	del /Q showjournal.exe showstat4.exe showwal.exe speedtest1.exe 2>NUL
	del /Q mptester.exe wordcount.exe rbu.exe srcck1.exe 2>NUL
	del /Q $(SQLITE3EXE) $(SQLITE3DLL) sqlite3.def 2>NUL
	del /Q sqlite3.c sqlite3-*.c 2>NUL
	del /Q sqlite3rc.h 2>NUL
	del /Q shell.c sqlite3ext.h 2>NUL
	del /Q sqlite3_analyzer.exe sqlite3_analyzer.c 2>NUL
	del /Q sqlite-*-output.vsix 2>NUL
	del /Q fuzzershell.exe fuzzcheck.exe sqldiff.exe 2>NUL
	del /Q fts5.* fts5parse.* 2>NUL
# <</mark>>

!IFNDEF SQLITE3H
SQLITE3H = sqlite3.h
!ENDIF

# This is the name to use for the SQLite dynamic link library (DLL).
#
!IFNDEF SQLITE3DLL
!IF $(FOR_WIN10)!=0
SQLITE3DLL = winsqlite3.dll
!ELSE
SQLITE3DLL = sqlite3.dll
!ENDIF
!ENDIF

# This is the name to use for the SQLite import library (LIB).
#
!IFNDEF SQLITE3LIB
!IF $(FOR_WIN10)!=0
SQLITE3LIB = winsqlite3.lib
!ELSE
SQLITE3LIB = sqlite3.lib
!ENDIF
!ENDIF

# This is the name to use for the SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXE
!IF $(FOR_WIN10)!=0
SQLITE3EXE = winsqlite3shell.exe
!ELSE
SQLITE3EXE = sqlite3.exe
!ENDIF
!ENDIF

# This is the argument used to set the program database (PDB) file for the
# SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXEPDB
!IF $(FOR_WIN10)!=0
SQLITE3EXEPDB =
!ELSE
SQLITE3EXEPDB = /pdb:sqlite3sh.pdb
!ENDIF
!ENDIF

# These are the "standard" SQLite compilation options used when compiling for
# the Windows platform.
#
!IFNDEF OPT_FEATURE_FLAGS
OPT_FEATURE_FLAGS = $(OPT_FEATURE_FLAGS) -DSQLITE_ENABLE_FTS3=1
................................................................................
!ELSE
TCC = $(CC) -nologo -W3 $(CCOPTS) $(TCCOPTS)
!ENDIF

TCC = $(TCC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) -I$(TOP)\src -fp:precise
RCC = $(RC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) -I$(TOP)\src $(RCOPTS) $(RCCOPTS)










# Check if we want to use the "stdcall" calling convention when compiling.
# This is not supported by the compilers for non-x86 platforms.  It should
# also be noted here that building any target with these "stdcall" options
# will most likely fail if the Tcl library is also required.  This is due
# to how the Tcl library functions are declared and exported (i.e. without
# an explicit calling convention, which results in "cdecl").
#
................................................................................
#
dll: $(SQLITE3DLL)

# Shell executable.
#
shell: $(SQLITE3EXE)

# <<mark>>
libsqlite3.lib:	$(LIBOBJ)
	$(LTLIB) $(LTLIBOPTS) /OUT:$@ $(LIBOBJ) $(TLIBS)


libtclsqlite3.lib:	tclsqlite.lo libsqlite3.lib
	$(LTLIB) $(LTLIBOPTS) $(LTLIBPATHS) /OUT:$@ tclsqlite.lo libsqlite3.lib $(LIBTCLSTUB) $(TLIBS)
# <</mark>>

$(SQLITE3DLL): $(LIBOBJ) $(LIBRESOBJS) $(CORE_LINK_DEP)
	$(LD) $(LDFLAGS) $(LTLINKOPTS) $(LTLIBPATHS) /DLL $(CORE_LINK_OPTS) /OUT:$@ $(LIBOBJ) $(LIBRESOBJS) $(LTLIBS) $(TLIBS)

................................................................................
rbu.exe: $(TOP)\ext\rbu\rbu.c $(TOP)\ext\rbu\sqlite3rbu.c $(SQLITE3C) $(SQLITE3H)
	$(LTLINK) $(NO_WARN) -DSQLITE_ENABLE_RBU -Fe$@ \
		$(TOP)\ext\rbu\rbu.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)
# <</mark>>

clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.def *.cod *.da *.bb *.bbg *.vc gmon.out 2>NUL
	del /Q $(SQLITE3EXE) $(SQLITE3DLL) 2>NUL
# <<mark>>
	del /Q $(SQLITE3C) $(SQLITE3H) opcodes.c opcodes.h 2>NUL
	del /Q lemon.* lempar.c parse.* 2>NUL
	del /Q mkkeywordhash.* keywordhash.h 2>NUL
	del /Q notasharedlib.* 2>NUL
	-rmdir /Q/S .deps 2>NUL
	-rmdir /Q/S .libs 2>NUL
................................................................................
	del /Q tclsqlite3.exe 2>NUL
	del /Q testloadext.dll 2>NUL
	del /Q testfixture.exe test.db 2>NUL
	del /Q LogEst.exe fts3view.exe rollback-test.exe showdb.exe 2>NUL
	del /Q changeset.exe 2>NUL
	del /Q showjournal.exe showstat4.exe showwal.exe speedtest1.exe 2>NUL
	del /Q mptester.exe wordcount.exe rbu.exe srcck1.exe 2>NUL

	del /Q sqlite3.c sqlite3-*.c 2>NUL
	del /Q sqlite3rc.h 2>NUL
	del /Q shell.c sqlite3ext.h 2>NUL
	del /Q sqlite3_analyzer.exe sqlite3_analyzer.c 2>NUL
	del /Q sqlite-*-output.vsix 2>NUL
	del /Q fuzzershell.exe fuzzcheck.exe sqldiff.exe 2>NUL
	del /Q fts5.* fts5parse.* 2>NUL
# <</mark>>

3.11.0

3.12.0

!IFNDEF SQLITE3H
SQLITE3H = sqlite3.h
!ENDIF

# This is the name to use for the SQLite dynamic link library (DLL).
#
!IFNDEF SQLITE3DLL



SQLITE3DLL = sqlite3.dll

!ENDIF

# This is the name to use for the SQLite import library (LIB).
#
!IFNDEF SQLITE3LIB



SQLITE3LIB = sqlite3.lib

!ENDIF

# This is the name to use for the SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXE



SQLITE3EXE = sqlite3.exe

!ENDIF

# This is the argument used to set the program database (PDB) file for the
# SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXEPDB



SQLITE3EXEPDB = /pdb:sqlite3sh.pdb

!ENDIF

# These are the "standard" SQLite compilation options used when compiling for
# the Windows platform.
#
!IFNDEF OPT_FEATURE_FLAGS
OPT_FEATURE_FLAGS = $(OPT_FEATURE_FLAGS) -DSQLITE_ENABLE_FTS3=1
................................................................................
!ELSE
TCC = $(CC) -nologo -W3 $(CCOPTS) $(TCCOPTS)
!ENDIF

TCC = $(TCC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) -fp:precise
RCC = $(RC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) $(RCOPTS) $(RCCOPTS)

# Adjust the names of the primary targets for use with Windows 10.
#
!IF $(FOR_WIN10)!=0
SQLITE3DLL = winsqlite3.dll
SQLITE3LIB = winsqlite3.lib
SQLITE3EXE = winsqlite3shell.exe
SQLITE3EXEPDB =
!ENDIF

# Check if we want to use the "stdcall" calling convention when compiling.
# This is not supported by the compilers for non-x86 platforms.  It should
# also be noted here that building any target with these "stdcall" options
# will most likely fail if the Tcl library is also required.  This is due
# to how the Tcl library functions are declared and exported (i.e. without
# an explicit calling convention, which results in "cdecl").
#
................................................................................
SHELL_COMPILE_OPTS = $(SHELL_COMPILE_OPTS) -DSQLITE_SHELL_JSON1 -DSQLITE_ENABLE_FTS4 -DSQLITE_ENABLE_EXPLAIN_COMMENTS
!ENDIF


# This is the default Makefile target.  The objects listed here
# are what get build when you type just "make" with no arguments.
#
all:	dll libsqlite3.lib shell

# Dynamic link library section.
#
dll: $(SQLITE3DLL)

# Shell executable.
#
shell: $(SQLITE3EXE)

libsqlite3.lib:	$(LIBOBJ)
	$(LTLIB) $(LTLIBOPTS) /OUT:$@ $(LIBOBJ) $(TLIBS)


$(SQLITE3DLL): $(LIBOBJ) $(LIBRESOBJS) $(CORE_LINK_DEP)
	$(LD) $(LDFLAGS) $(LTLINKOPTS) $(LTLIBPATHS) /DLL $(CORE_LINK_OPTS) /OUT:$@ $(LIBOBJ) $(LIBRESOBJS) $(LTLIBS) $(TLIBS)


$(SQLITE3EXE):	$(TOP)\shell.c $(SHELL_CORE_DEP) $(LIBRESOBJS) $(SHELL_CORE_SRC) $(SQLITE3H)
	$(LTLINK) $(SHELL_COMPILE_OPTS) $(READLINE_FLAGS) $(TOP)\shell.c $(SHELL_CORE_SRC) \
................................................................................
	echo #endif >> sqlite3rc.h
	$(LTRCOMPILE) -fo $(LIBRESOBJS) -DRC_VERONLY $(TOP)\sqlite3.rc
!ENDIF


clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.cod *.da *.bb *.bbg *.vc gmon.out 2>NUL

!IFNDEF SQLITE3H
SQLITE3H = sqlite3.h
!ENDIF

# This is the name to use for the SQLite dynamic link library (DLL).
#
!IFNDEF SQLITE3DLL
!IF $(FOR_WIN10)!=0
SQLITE3DLL = winsqlite3.dll
!ELSE
SQLITE3DLL = sqlite3.dll
!ENDIF
!ENDIF

# This is the name to use for the SQLite import library (LIB).
#
!IFNDEF SQLITE3LIB
!IF $(FOR_WIN10)!=0
SQLITE3LIB = winsqlite3.lib
!ELSE
SQLITE3LIB = sqlite3.lib
!ENDIF
!ENDIF

# This is the name to use for the SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXE
!IF $(FOR_WIN10)!=0
SQLITE3EXE = winsqlite3shell.exe
!ELSE
SQLITE3EXE = sqlite3.exe
!ENDIF
!ENDIF

# This is the argument used to set the program database (PDB) file for the
# SQLite shell executable (EXE).
#
!IFNDEF SQLITE3EXEPDB
!IF $(FOR_WIN10)!=0
SQLITE3EXEPDB =
!ELSE
SQLITE3EXEPDB = /pdb:sqlite3sh.pdb
!ENDIF
!ENDIF

# These are the "standard" SQLite compilation options used when compiling for
# the Windows platform.
#
!IFNDEF OPT_FEATURE_FLAGS
OPT_FEATURE_FLAGS = $(OPT_FEATURE_FLAGS) -DSQLITE_ENABLE_FTS3=1
................................................................................
!ELSE
TCC = $(CC) -nologo -W3 $(CCOPTS) $(TCCOPTS)
!ENDIF

TCC = $(TCC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) -fp:precise
RCC = $(RC) -DSQLITE_OS_WIN=1 -I. -I$(TOP) $(RCOPTS) $(RCCOPTS)










# Check if we want to use the "stdcall" calling convention when compiling.
# This is not supported by the compilers for non-x86 platforms.  It should
# also be noted here that building any target with these "stdcall" options
# will most likely fail if the Tcl library is also required.  This is due
# to how the Tcl library functions are declared and exported (i.e. without
# an explicit calling convention, which results in "cdecl").
#
................................................................................
SHELL_COMPILE_OPTS = $(SHELL_COMPILE_OPTS) -DSQLITE_SHELL_JSON1 -DSQLITE_ENABLE_FTS4 -DSQLITE_ENABLE_EXPLAIN_COMMENTS
!ENDIF


# This is the default Makefile target.  The objects listed here
# are what get build when you type just "make" with no arguments.
#
all:	dll shell

# Dynamic link library section.
#
dll: $(SQLITE3DLL)

# Shell executable.
#
shell: $(SQLITE3EXE)





$(SQLITE3DLL): $(LIBOBJ) $(LIBRESOBJS) $(CORE_LINK_DEP)
	$(LD) $(LDFLAGS) $(LTLINKOPTS) $(LTLIBPATHS) /DLL $(CORE_LINK_OPTS) /OUT:$@ $(LIBOBJ) $(LIBRESOBJS) $(LTLIBS) $(TLIBS)


$(SQLITE3EXE):	$(TOP)\shell.c $(SHELL_CORE_DEP) $(LIBRESOBJS) $(SHELL_CORE_SRC) $(SQLITE3H)
	$(LTLINK) $(SHELL_COMPILE_OPTS) $(READLINE_FLAGS) $(TOP)\shell.c $(SHELL_CORE_SRC) \
................................................................................
	echo #endif >> sqlite3rc.h
	$(LTRCOMPILE) -fo $(LIBRESOBJS) -DRC_VERONLY $(TOP)\sqlite3.rc
!ENDIF


clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.def *.cod *.da *.bb *.bbg *.vc gmon.out 2>NUL
	del /Q $(SQLITE3EXE) $(SQLITE3DLL) 2>NUL

#! /bin/sh
# Guess values for system-dependent variables and create Makefiles.
# Generated by GNU Autoconf 2.69 for sqlite 3.11.0.
#
#
# Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
#
#
# This configure script is free software; the Free Software Foundation
# gives unlimited permission to copy, distribute and modify it.
................................................................................
subdirs=
MFLAGS=
MAKEFLAGS=

# Identity of this package.
PACKAGE_NAME='sqlite'
PACKAGE_TARNAME='sqlite'
PACKAGE_VERSION='3.11.0'
PACKAGE_STRING='sqlite 3.11.0'
PACKAGE_BUGREPORT=''
PACKAGE_URL=''

# Factoring default headers for most tests.
ac_includes_default="\
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
................................................................................
#
# Report the --help message.
#
if test "$ac_init_help" = "long"; then
  # Omit some internal or obsolete options to make the list less imposing.
  # This message is too long to be a string in the A/UX 3.1 sh.
  cat <<_ACEOF
\`configure' configures sqlite 3.11.0 to adapt to many kinds of systems.

Usage: $0 [OPTION]... [VAR=VALUE]...

To assign environment variables (e.g., CC, CFLAGS...), specify them as
VAR=VALUE.  See below for descriptions of some of the useful variables.

Defaults for the options are specified in brackets.
................................................................................
  --build=BUILD     configure for building on BUILD [guessed]
  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
_ACEOF
fi

if test -n "$ac_init_help"; then
  case $ac_init_help in
     short | recursive ) echo "Configuration of sqlite 3.11.0:";;
   esac
  cat <<\_ACEOF

Optional Features:
  --disable-option-checking  ignore unrecognized --enable/--with options
  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
................................................................................
    cd "$ac_pwd" || { ac_status=$?; break; }
  done
fi

test -n "$ac_init_help" && exit $ac_status
if $ac_init_version; then
  cat <<\_ACEOF
sqlite configure 3.11.0
generated by GNU Autoconf 2.69

Copyright (C) 2012 Free Software Foundation, Inc.
This configure script is free software; the Free Software Foundation
gives unlimited permission to copy, distribute and modify it.
_ACEOF
  exit
................................................................................
  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno

} # ac_fn_c_check_header_mongrel
cat >config.log <<_ACEOF
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by sqlite $as_me 3.11.0, which was
generated by GNU Autoconf 2.69.  Invocation command line was

  $ $0 $@

_ACEOF
exec 5>>config.log
{
................................................................................
test $as_write_fail = 0 && chmod +x $CONFIG_STATUS || ac_write_fail=1

cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
# Save the log message, to keep $0 and so on meaningful, and to
# report actual input values of CONFIG_FILES etc. instead of their
# values after options handling.
ac_log="
This file was extended by sqlite $as_me 3.11.0, which was
generated by GNU Autoconf 2.69.  Invocation command line was

  CONFIG_FILES    = $CONFIG_FILES
  CONFIG_HEADERS  = $CONFIG_HEADERS
  CONFIG_LINKS    = $CONFIG_LINKS
  CONFIG_COMMANDS = $CONFIG_COMMANDS
  $ $0 $@
................................................................................

Report bugs to the package provider."

_ACEOF
cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
ac_cs_version="\\
sqlite config.status 3.11.0
configured by $0, generated by GNU Autoconf 2.69,
  with options \\"\$ac_cs_config\\"

Copyright (C) 2012 Free Software Foundation, Inc.
This config.status script is free software; the Free Software Foundation
gives unlimited permission to copy, distribute and modify it."

#! /bin/sh
# Guess values for system-dependent variables and create Makefiles.
# Generated by GNU Autoconf 2.69 for sqlite 3.12.0.
#
#
# Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
#
#
# This configure script is free software; the Free Software Foundation
# gives unlimited permission to copy, distribute and modify it.
................................................................................
subdirs=
MFLAGS=
MAKEFLAGS=

# Identity of this package.
PACKAGE_NAME='sqlite'
PACKAGE_TARNAME='sqlite'
PACKAGE_VERSION='3.12.0'
PACKAGE_STRING='sqlite 3.12.0'
PACKAGE_BUGREPORT=''
PACKAGE_URL=''

# Factoring default headers for most tests.
ac_includes_default="\
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
................................................................................
#
# Report the --help message.
#
if test "$ac_init_help" = "long"; then
  # Omit some internal or obsolete options to make the list less imposing.
  # This message is too long to be a string in the A/UX 3.1 sh.
  cat <<_ACEOF
\`configure' configures sqlite 3.12.0 to adapt to many kinds of systems.

Usage: $0 [OPTION]... [VAR=VALUE]...

To assign environment variables (e.g., CC, CFLAGS...), specify them as
VAR=VALUE.  See below for descriptions of some of the useful variables.

Defaults for the options are specified in brackets.
................................................................................
  --build=BUILD     configure for building on BUILD [guessed]
  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
_ACEOF
fi

if test -n "$ac_init_help"; then
  case $ac_init_help in
     short | recursive ) echo "Configuration of sqlite 3.12.0:";;
   esac
  cat <<\_ACEOF

Optional Features:
  --disable-option-checking  ignore unrecognized --enable/--with options
  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
................................................................................
    cd "$ac_pwd" || { ac_status=$?; break; }
  done
fi

test -n "$ac_init_help" && exit $ac_status
if $ac_init_version; then
  cat <<\_ACEOF
sqlite configure 3.12.0
generated by GNU Autoconf 2.69

Copyright (C) 2012 Free Software Foundation, Inc.
This configure script is free software; the Free Software Foundation
gives unlimited permission to copy, distribute and modify it.
_ACEOF
  exit
................................................................................
  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno

} # ac_fn_c_check_header_mongrel
cat >config.log <<_ACEOF
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by sqlite $as_me 3.12.0, which was
generated by GNU Autoconf 2.69.  Invocation command line was

  $ $0 $@

_ACEOF
exec 5>>config.log
{
................................................................................
test $as_write_fail = 0 && chmod +x $CONFIG_STATUS || ac_write_fail=1

cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
# Save the log message, to keep $0 and so on meaningful, and to
# report actual input values of CONFIG_FILES etc. instead of their
# values after options handling.
ac_log="
This file was extended by sqlite $as_me 3.12.0, which was
generated by GNU Autoconf 2.69.  Invocation command line was

  CONFIG_FILES    = $CONFIG_FILES
  CONFIG_HEADERS  = $CONFIG_HEADERS
  CONFIG_LINKS    = $CONFIG_LINKS
  CONFIG_COMMANDS = $CONFIG_COMMANDS
  $ $0 $@
................................................................................

Report bugs to the package provider."

_ACEOF
cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
ac_cs_version="\\
sqlite config.status 3.12.0
configured by $0, generated by GNU Autoconf 2.69,
  with options \\"\$ac_cs_config\\"

Copyright (C) 2012 Free Software Foundation, Inc.
This config.status script is free software; the Free Software Foundation
gives unlimited permission to copy, distribute and modify it."

the type of the third argument is integer, but the grammar will
usually redefine this type to be some kind of structure.
Typically the second argument will be a broad category of tokens
such as ``identifier'' or ``number'' and the third argument will
be the name of the identifier or the value of the number.</p>

<p>The Parse() function may have either three or four arguments,
depending on the grammar.  If the grammar specification file request

it, the Parse() function will have a fourth parameter that can be
of any type chosen by the programmer.  The parser doesn't do anything
with this argument except to pass it through to action routines.
This is a convenient mechanism for passing state information down
to the action routines without having to use global variables.</p>

<p>A typical use of a Lemon parser might look something like the
following:
................................................................................
<li>Lemon allows multiple parsers to be running simultaneously.  Yacc
    and bison do not.
</ul>
These differences may cause some initial confusion for programmers
with prior yacc and bison experience.
But after years of experience using Lemon, I firmly
believe that the Lemon way of doing things is better.</p>







<h2>Input File Syntax</h2>

<p>The main purpose of the grammar specification file for Lemon is
to define the grammar for the parser.  But the input file also
specifies additional information Lemon requires to do its job.
Most of the work in using Lemon is in writing an appropriate
................................................................................
the destructor is not called in this circumstance.</p>

<p>By appropriate use of destructors, it is possible to
build a parser using Lemon that can be used within a long-running
program, such as a GUI, that will not leak memory or other resources.
To do the same using yacc or bison is much more difficult.</p>


<h4>The <tt>%extra_argument</tt> directive</h4>

The %extra_argument directive instructs Lemon to add a 4th parameter
to the parameter list of the Parse() function it generates.  Lemon
doesn't do anything itself with this extra argument, but it does
make the argument available to C-code action routines, destructors,
and so forth.  For example, if the grammar file contains:</p>

the type of the third argument is integer, but the grammar will
usually redefine this type to be some kind of structure.
Typically the second argument will be a broad category of tokens
such as ``identifier'' or ``number'' and the third argument will
be the name of the identifier or the value of the number.</p>

<p>The Parse() function may have either three or four arguments,
depending on the grammar.  If the grammar specification file requests
it (via the <a href='#extraarg'><tt>extra_argument</tt> directive</a>),
the Parse() function will have a fourth parameter that can be
of any type chosen by the programmer.  The parser doesn't do anything
with this argument except to pass it through to action routines.
This is a convenient mechanism for passing state information down
to the action routines without having to use global variables.</p>

<p>A typical use of a Lemon parser might look something like the
following:
................................................................................
<li>Lemon allows multiple parsers to be running simultaneously.  Yacc
    and bison do not.
</ul>
These differences may cause some initial confusion for programmers
with prior yacc and bison experience.
But after years of experience using Lemon, I firmly
believe that the Lemon way of doing things is better.</p>

<p><i>Updated as of 2016-02-16:</i>
The text above was written in the 1990s.
We are told that Bison has lately been enhanced to support the
tokenizer-calls-parser paradigm used by Lemon, and to obviate the
need for global variables.</p>

<h2>Input File Syntax</h2>

<p>The main purpose of the grammar specification file for Lemon is
to define the grammar for the parser.  But the input file also
specifies additional information Lemon requires to do its job.
Most of the work in using Lemon is in writing an appropriate
................................................................................
the destructor is not called in this circumstance.</p>

<p>By appropriate use of destructors, it is possible to
build a parser using Lemon that can be used within a long-running
program, such as a GUI, that will not leak memory or other resources.
To do the same using yacc or bison is much more difficult.</p>

<a name="extraarg"></a>
<h4>The <tt>%extra_argument</tt> directive</h4>

The %extra_argument directive instructs Lemon to add a 4th parameter
to the parameter list of the Parse() function it generates.  Lemon
doesn't do anything itself with this extra argument, but it does
make the argument available to C-code action routines, destructors,
and so forth.  For example, if the grammar file contains:</p>

  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifdef SQLITE_ENABLE_FTS3
  char aBuf[24];
  int rc;
  Tcl_WideInt w, w2;

  int nByte, nByte2;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "INTEGER");
    return TCL_ERROR;
  }

  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifdef SQLITE_ENABLE_FTS3
  char aBuf[24];
  int rc;
  Tcl_WideInt w;
  sqlite3_int64 w2;
  int nByte, nByte2;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "INTEGER");
    return TCL_ERROR;
  }

    pRet->nRef = 1;
    pRet->nLevel = nLevel;
    pRet->nSegment = nSegment;
    i += sqlite3Fts5GetVarint(&pData[i], &pRet->nWriteCounter);

    for(iLvl=0; rc==SQLITE_OK && iLvl<nLevel; iLvl++){
      Fts5StructureLevel *pLvl = &pRet->aLevel[iLvl];
      int nTotal;
      int iSeg;

      if( i>=nData ){
        rc = FTS5_CORRUPT;
      }else{
        i += fts5GetVarint32(&pData[i], pLvl->nMerge);
        i += fts5GetVarint32(&pData[i], nTotal);

    pRet->nRef = 1;
    pRet->nLevel = nLevel;
    pRet->nSegment = nSegment;
    i += sqlite3Fts5GetVarint(&pData[i], &pRet->nWriteCounter);

    for(iLvl=0; rc==SQLITE_OK && iLvl<nLevel; iLvl++){
      Fts5StructureLevel *pLvl = &pRet->aLevel[iLvl];
      int nTotal = 0;
      int iSeg;

      if( i>=nData ){
        rc = FTS5_CORRUPT;
      }else{
        i += fts5GetVarint32(&pData[i], pLvl->nMerge);
        i += fts5GetVarint32(&pData[i], nTotal);

    }
    if( rc==SQLITE_OK ){
      rc = sqlite3_create_function(
          db, "fts5_source_id", 0, SQLITE_UTF8, p, fts5SourceIdFunc, 0, 0
      );
    }
  }











  return rc;
}

/*
** The following functions are used to register the module with SQLite. If
** this module is being built as part of the SQLite core (SQLITE_CORE is
** defined), then sqlite3_open() will call sqlite3Fts5Init() directly.

    }
    if( rc==SQLITE_OK ){
      rc = sqlite3_create_function(
          db, "fts5_source_id", 0, SQLITE_UTF8, p, fts5SourceIdFunc, 0, 0
      );
    }
  }

  /* If SQLITE_FTS5_ENABLE_TEST_MI is defined, assume that the file
  ** fts5_test_mi.c is compiled and linked into the executable. And call
  ** its entry point to enable the matchinfo() demo.  */
#ifdef SQLITE_FTS5_ENABLE_TEST_MI
  if( rc==SQLITE_OK ){
    extern int sqlite3Fts5TestRegisterMatchinfo(sqlite3*);
    rc = sqlite3Fts5TestRegisterMatchinfo(db);
  }
#endif

  return rc;
}

/*
** The following functions are used to register the module with SQLite. If
** this module is being built as part of the SQLite core (SQLITE_CORE is
** defined), then sqlite3_open() will call sqlite3Fts5Init() directly.

** This file exports a single function that may be called to register the
** matchinfo() implementation with a database handle:
**
**   int sqlite3Fts5TestRegisterMatchinfo(sqlite3 *db);
*/


#ifdef SQLITE_TEST
#ifdef SQLITE_ENABLE_FTS5

#include "fts5.h"
#include <tcl.h>
#include <assert.h>
#include <string.h>

typedef struct Fts5MatchinfoCtx Fts5MatchinfoCtx;


typedef unsigned int u32;


struct Fts5MatchinfoCtx {
  int nCol;                       /* Number of cols in FTS5 table */
  int nPhrase;                    /* Number of phrases in FTS5 query */
  char *zArg;                     /* nul-term'd copy of 2nd arg */
  int nRet;                       /* Number of elements in aRet[] */
  u32 *aRet;                      /* Array of 32-bit unsigned ints to return */
................................................................................
      for(iPhrase=0; iPhrase<p->nPhrase; iPhrase++){
        Fts5PhraseIter iter;
        int iOff, iCol;
        for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff); 
            iOff>=0; 
            pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
        ){
          if( f=='b' ){
            aOut[iPhrase * ((p->nCol+31)/32) + iCol/32] |= ((u32)1 << iCol%32);
          }else{
            aOut[nMul * (iCol + iPhrase * p->nCol)]++;
          }
        }
      }

      break;
    }

    case 'l': {
................................................................................
  pApi = fts5_api_from_db(db);

  /* If fts5_api_from_db() returns NULL, then either FTS5 is not registered
  ** with this database handle, or an error (OOM perhaps?) has occurred.
  **
  ** Also check that the fts5_api object is version 2 or newer.  
  */ 
  if( pApi==0 || pApi->iVersion<1 ){
    return SQLITE_ERROR;
  }

  /* Register the implementation of matchinfo() */
  rc = pApi->xCreateFunction(pApi, "matchinfo", 0, fts5MatchinfoFunc, 0);

  return rc;
}

#endif /* SQLITE_ENABLE_FTS5 */
#endif /* SQLITE_TEST */

** This file exports a single function that may be called to register the
** matchinfo() implementation with a database handle:
**
**   int sqlite3Fts5TestRegisterMatchinfo(sqlite3 *db);
*/



#ifdef SQLITE_ENABLE_FTS5

#include "fts5.h"

#include <assert.h>
#include <string.h>

typedef struct Fts5MatchinfoCtx Fts5MatchinfoCtx;

#ifndef SQLITE_AMALGAMATION
typedef unsigned int u32;
#endif

struct Fts5MatchinfoCtx {
  int nCol;                       /* Number of cols in FTS5 table */
  int nPhrase;                    /* Number of phrases in FTS5 query */
  char *zArg;                     /* nul-term'd copy of 2nd arg */
  int nRet;                       /* Number of elements in aRet[] */
  u32 *aRet;                      /* Array of 32-bit unsigned ints to return */
................................................................................
      for(iPhrase=0; iPhrase<p->nPhrase; iPhrase++){
        Fts5PhraseIter iter;
        int iOff, iCol;
        for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff); 
            iOff>=0; 
            pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
        ){



          aOut[nMul * (iCol + iPhrase * p->nCol)]++;

        }
      }

      break;
    }

    case 'l': {
................................................................................
  pApi = fts5_api_from_db(db);

  /* If fts5_api_from_db() returns NULL, then either FTS5 is not registered
  ** with this database handle, or an error (OOM perhaps?) has occurred.
  **
  ** Also check that the fts5_api object is version 2 or newer.  
  */ 
  if( pApi==0 || pApi->iVersion<2 ){
    return SQLITE_ERROR;
  }

  /* Register the implementation of matchinfo() */
  rc = pApi->xCreateFunction(pApi, "matchinfo", 0, fts5MatchinfoFunc, 0);

  return rc;
}

#endif /* SQLITE_ENABLE_FTS5 */

%syntax_error {
  UNUSED_PARAM(yymajor); /* Silence a compiler warning */
  sqlite3Fts5ParseError(
    pParse, "fts5: syntax error near \"%.*s\"",TOKEN.n,TOKEN.p
  );
}
%stack_overflow {
  UNUSED_PARAM(yypMinor); /* Silence a compiler warning */
  sqlite3Fts5ParseError(pParse, "fts5: parser stack overflow");
}

// The name of the generated procedure that implements the parser
// is as follows:
%name sqlite3Fts5Parser

%syntax_error {
  UNUSED_PARAM(yymajor); /* Silence a compiler warning */
  sqlite3Fts5ParseError(
    pParse, "fts5: syntax error near \"%.*s\"",TOKEN.n,TOKEN.p
  );
}
%stack_overflow {

  sqlite3Fts5ParseError(pParse, "fts5: parser stack overflow");
}

// The name of the generated procedure that implements the parser
// is as follows:
%name sqlite3Fts5Parser

# 2016 February 17
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
#
# This file is focused on OOM errors.
#

source [file join [file dirname [info script]] fts5_common.tcl]
source $testdir/malloc_common.tcl
set testprefix fts5faultB

# If SQLITE_ENABLE_FTS3 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

proc mit {blob} {
  set scan(littleEndian) i*
  set scan(bigEndian) I*
  binary scan $blob $scan($::tcl_platform(byteOrder)) r
  return $r
}
db func mit mit


#-------------------------------------------------------------------------
# Errors while registering the matchinfo() demo function.
#
do_faultsim_test 1 -faults oom* -prep {
  sqlite3 db test.db
} -body {
  sqlite3_fts5_register_matchinfo db
} -test {
  faultsim_test_result {0 {}} {1 SQLITE_ERROR} {1 SQLITE_NOMEM}
}


#-------------------------------------------------------------------------
# Errors while executing the matchinfo() demo function.
#
reset_db
sqlite3_fts5_register_matchinfo db
db func mit mit
do_execsql_test 2 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b);
  INSERT INTO t1 VALUES('x y z', '1 2 3');
  INSERT INTO t1 VALUES('x', '1 2 3 4 5 6 7');
}

do_faultsim_test 2.1 -faults oom* -body {
  execsql { SELECT mit(matchinfo(t1, 'a')) FROM t1('x') }
} -test {
  faultsim_test_result {0 {{2 5} {2 5}}} 
}

do_faultsim_test 2.2 -faults oom* -body {
  execsql { SELECT mit(matchinfo(t1, 'l')) FROM t1('x') }
} -test {
  faultsim_test_result {0 {{3 3} {1 7}}} 
}

do_execsql_test 2.3 {
  INSERT INTO t1 VALUES('a b c d e f', 'a b d e f c');
  INSERT INTO t1 VALUES('l m b c a', 'n o a b c z');
}

do_faultsim_test 2.4 -faults oom* -body {
  execsql { SELECT mit(matchinfo(t1, 's')) FROM t1('a b c') }
} -test {
  faultsim_test_result {0 {{3 2} {2 3}}} 
}


finish_test

do_execsql_test 12.1 {
  INSERT INTO tt (rowid, c4, c45) VALUES(1, 'abc', 'abc');
  SELECT mit(matchinfo(tt, 'b')) FROM tt WHERE tt MATCH 'abc';
} [list [list [expr 1<<4] [expr 1<<(45-32)]]]

} ;# foreach_detail_mode

























finish_test

do_execsql_test 12.1 {
  INSERT INTO tt (rowid, c4, c45) VALUES(1, 'abc', 'abc');
  SELECT mit(matchinfo(tt, 'b')) FROM tt WHERE tt MATCH 'abc';
} [list [list [expr 1<<4] [expr 1<<(45-32)]]]

} ;# foreach_detail_mode

#-------------------------------------------------------------------------
# Test that a bad fts5() return is detected
#
reset_db
proc xyz {} {}
db func fts5 -argcount 0 xyz
do_test 13.1 {
  list [catch { sqlite3_fts5_register_matchinfo db } msg] $msg
} {1 SQLITE_ERROR}

#-------------------------------------------------------------------------
# Test that an invalid matchinfo() flag is detected
#
reset_db
sqlite3_fts5_register_matchinfo db
do_execsql_test 14.1 {
  CREATE VIRTUAL TABLE x1 USING fts5(z);
  INSERT INTO x1 VALUES('a b c a b c a b c');
} {}

do_catchsql_test 14.2 {
  SELECT matchinfo(x1, 'd') FROM x1('a b c');
} {1 {unrecognized matchinfo flag: d}}

finish_test

** either the xOpen() or xAccess() VFS method, return a pointer to the
** file-handle opened by the same database connection on the corresponding
** database file.
*/
static rbu_file *rbuFindMaindb(rbu_vfs *pRbuVfs, const char *zWal){
  rbu_file *pDb;
  sqlite3_mutex_enter(pRbuVfs->mutex);
  for(pDb=pRbuVfs->pMain; pDb && pDb->zWal!=zWal; pDb=pDb->pMainNext);
  sqlite3_mutex_leave(pRbuVfs->mutex);
  return pDb;
}

/*
** Open an rbu file handle.
*/

** either the xOpen() or xAccess() VFS method, return a pointer to the
** file-handle opened by the same database connection on the corresponding
** database file.
*/
static rbu_file *rbuFindMaindb(rbu_vfs *pRbuVfs, const char *zWal){
  rbu_file *pDb;
  sqlite3_mutex_enter(pRbuVfs->mutex);
  for(pDb=pRbuVfs->pMain; pDb && pDb->zWal!=zWal; pDb=pDb->pMainNext){}
  sqlite3_mutex_leave(pRbuVfs->mutex);
  return pDb;
}

/*
** Open an rbu file handle.
*/

}
#endif   /* !SQLITE_OMIT_TRIGGER */

/*
** Register built-in functions used to help implement ALTER TABLE
*/
void sqlite3AlterFunctions(void){
  static SQLITE_WSD FuncDef aAlterTableFuncs[] = {
    FUNCTION(sqlite_rename_table,   2, 0, 0, renameTableFunc),
#ifndef SQLITE_OMIT_TRIGGER
    FUNCTION(sqlite_rename_trigger, 2, 0, 0, renameTriggerFunc),
#endif
#ifndef SQLITE_OMIT_FOREIGN_KEY
    FUNCTION(sqlite_rename_parent,  3, 0, 0, renameParentFunc),
#endif
  };
  int i;
  FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
  FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aAlterTableFuncs);

  for(i=0; i<ArraySize(aAlterTableFuncs); i++){
    sqlite3FuncDefInsert(pHash, &aFunc[i]);
  }
}

/*
** This function is used to create the text of expressions of the form:
**
**   name=<constant1> OR name=<constant2> OR ...
**

}
#endif   /* !SQLITE_OMIT_TRIGGER */

/*
** Register built-in functions used to help implement ALTER TABLE
*/
void sqlite3AlterFunctions(void){
  static FuncDef aAlterTableFuncs[] = {
    FUNCTION(sqlite_rename_table,   2, 0, 0, renameTableFunc),
#ifndef SQLITE_OMIT_TRIGGER
    FUNCTION(sqlite_rename_trigger, 2, 0, 0, renameTriggerFunc),
#endif
#ifndef SQLITE_OMIT_FOREIGN_KEY
    FUNCTION(sqlite_rename_parent,  3, 0, 0, renameParentFunc),
#endif
  };




  sqlite3InsertBuiltinFuncs(aAlterTableFuncs, ArraySize(aAlterTableFuncs));


}

/*
** This function is used to create the text of expressions of the form:
**
**   name=<constant1> OR name=<constant2> OR ...
**

  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xSFunc */
  0,               /* xFinalize */
  "stat_init",     /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

#ifdef SQLITE_ENABLE_STAT4
/*
** pNew and pOld are both candidate non-periodic samples selected for 
** the same column (pNew->iCol==pOld->iCol). Ignoring this column and 
** considering only any trailing columns and the sample hash value, this
................................................................................
  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statPush,        /* xSFunc */
  0,               /* xFinalize */
  "stat_push",     /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

#define STAT_GET_STAT1 0          /* "stat" column of stat1 table */
#define STAT_GET_ROWID 1          /* "rowid" column of stat[34] entry */
#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */
................................................................................
  1+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statGet,         /* xSFunc */
  0,               /* xFinalize */
  "stat_get",      /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

static void callStatGet(Vdbe *v, int regStat4, int iParam, int regOut){
  assert( regOut!=regStat4 && regOut!=regStat4+1 );
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  sqlite3VdbeAddOp2(v, OP_Integer, iParam, regStat4+1);
#elif SQLITE_DEBUG
................................................................................
  char *zSql;                   /* Text of the SQL statement */
  Index *pPrevIdx = 0;          /* Previous index in the loop */
  IndexSample *pSample;         /* A slot in pIdx->aSample[] */

  assert( db->lookaside.bDisable );
  zSql = sqlite3MPrintf(db, zSql1, zDb);
  if( !zSql ){
    return SQLITE_NOMEM;
  }
  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
  sqlite3DbFree(db, zSql);
  if( rc ) return rc;

  while( sqlite3_step(pStmt)==SQLITE_ROW ){
    int nIdxCol = 1;              /* Number of columns in stat4 records */
................................................................................
    nByte = sizeof(IndexSample) * nSample;
    nByte += sizeof(tRowcnt) * nIdxCol * 3 * nSample;
    nByte += nIdxCol * sizeof(tRowcnt);     /* Space for Index.aAvgEq[] */

    pIdx->aSample = sqlite3DbMallocZero(db, nByte);
    if( pIdx->aSample==0 ){
      sqlite3_finalize(pStmt);
      return SQLITE_NOMEM;
    }
    pSpace = (tRowcnt*)&pIdx->aSample[nSample];
    pIdx->aAvgEq = pSpace; pSpace += nIdxCol;
    for(i=0; i<nSample; i++){
      pIdx->aSample[i].anEq = pSpace; pSpace += nIdxCol;
      pIdx->aSample[i].anLt = pSpace; pSpace += nIdxCol;
      pIdx->aSample[i].anDLt = pSpace; pSpace += nIdxCol;
................................................................................
    assert( ((u8*)pSpace)-nByte==(u8*)(pIdx->aSample) );
  }
  rc = sqlite3_finalize(pStmt);
  if( rc ) return rc;

  zSql = sqlite3MPrintf(db, zSql2, zDb);
  if( !zSql ){
    return SQLITE_NOMEM;
  }
  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
  sqlite3DbFree(db, zSql);
  if( rc ) return rc;

  while( sqlite3_step(pStmt)==SQLITE_ROW ){
    char *zIndex;                 /* Index name */
................................................................................
    ** end of the allocated buffer before it realizes it is dealing with
    ** a corrupt record. Adding the two 0x00 bytes prevents this from causing
    ** a buffer overread.  */
    pSample->n = sqlite3_column_bytes(pStmt, 4);
    pSample->p = sqlite3DbMallocZero(db, pSample->n + 2);
    if( pSample->p==0 ){
      sqlite3_finalize(pStmt);
      return SQLITE_NOMEM;
    }
    memcpy(pSample->p, sqlite3_column_blob(pStmt, 4), pSample->n);
    pIdx->nSample++;
  }
  rc = sqlite3_finalize(pStmt);
  if( rc==SQLITE_OK ) initAvgEq(pPrevIdx);
  return rc;
................................................................................
    return SQLITE_ERROR;
  }

  /* Load new statistics out of the sqlite_stat1 table */
  zSql = sqlite3MPrintf(db, 
      "SELECT tbl,idx,stat FROM %Q.sqlite_stat1", sInfo.zDatabase);
  if( zSql==0 ){
    rc = SQLITE_NOMEM;
  }else{
    rc = sqlite3_exec(db, zSql, analysisLoader, &sInfo, 0);
    sqlite3DbFree(db, zSql);
  }


  /* Load the statistics from the sqlite_stat4 table. */

  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xSFunc */
  0,               /* xFinalize */
  "stat_init",     /* zName */
  {0}

};

#ifdef SQLITE_ENABLE_STAT4
/*
** pNew and pOld are both candidate non-periodic samples selected for 
** the same column (pNew->iCol==pOld->iCol). Ignoring this column and 
** considering only any trailing columns and the sample hash value, this
................................................................................
  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statPush,        /* xSFunc */
  0,               /* xFinalize */
  "stat_push",     /* zName */
  {0}

};

#define STAT_GET_STAT1 0          /* "stat" column of stat1 table */
#define STAT_GET_ROWID 1          /* "rowid" column of stat[34] entry */
#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */
................................................................................
  1+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statGet,         /* xSFunc */
  0,               /* xFinalize */
  "stat_get",      /* zName */
  {0}

};

static void callStatGet(Vdbe *v, int regStat4, int iParam, int regOut){
  assert( regOut!=regStat4 && regOut!=regStat4+1 );
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  sqlite3VdbeAddOp2(v, OP_Integer, iParam, regStat4+1);
#elif SQLITE_DEBUG
................................................................................
  char *zSql;                   /* Text of the SQL statement */
  Index *pPrevIdx = 0;          /* Previous index in the loop */
  IndexSample *pSample;         /* A slot in pIdx->aSample[] */

  assert( db->lookaside.bDisable );
  zSql = sqlite3MPrintf(db, zSql1, zDb);
  if( !zSql ){
    return SQLITE_NOMEM_BKPT;
  }
  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
  sqlite3DbFree(db, zSql);
  if( rc ) return rc;

  while( sqlite3_step(pStmt)==SQLITE_ROW ){
    int nIdxCol = 1;              /* Number of columns in stat4 records */
................................................................................
    nByte = sizeof(IndexSample) * nSample;
    nByte += sizeof(tRowcnt) * nIdxCol * 3 * nSample;
    nByte += nIdxCol * sizeof(tRowcnt);     /* Space for Index.aAvgEq[] */

    pIdx->aSample = sqlite3DbMallocZero(db, nByte);
    if( pIdx->aSample==0 ){
      sqlite3_finalize(pStmt);
      return SQLITE_NOMEM_BKPT;
    }
    pSpace = (tRowcnt*)&pIdx->aSample[nSample];
    pIdx->aAvgEq = pSpace; pSpace += nIdxCol;
    for(i=0; i<nSample; i++){
      pIdx->aSample[i].anEq = pSpace; pSpace += nIdxCol;
      pIdx->aSample[i].anLt = pSpace; pSpace += nIdxCol;
      pIdx->aSample[i].anDLt = pSpace; pSpace += nIdxCol;
................................................................................
    assert( ((u8*)pSpace)-nByte==(u8*)(pIdx->aSample) );
  }
  rc = sqlite3_finalize(pStmt);
  if( rc ) return rc;

  zSql = sqlite3MPrintf(db, zSql2, zDb);
  if( !zSql ){
    return SQLITE_NOMEM_BKPT;
  }
  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
  sqlite3DbFree(db, zSql);
  if( rc ) return rc;

  while( sqlite3_step(pStmt)==SQLITE_ROW ){
    char *zIndex;                 /* Index name */
................................................................................
    ** end of the allocated buffer before it realizes it is dealing with
    ** a corrupt record. Adding the two 0x00 bytes prevents this from causing
    ** a buffer overread.  */
    pSample->n = sqlite3_column_bytes(pStmt, 4);
    pSample->p = sqlite3DbMallocZero(db, pSample->n + 2);
    if( pSample->p==0 ){
      sqlite3_finalize(pStmt);
      return SQLITE_NOMEM_BKPT;
    }
    memcpy(pSample->p, sqlite3_column_blob(pStmt, 4), pSample->n);
    pIdx->nSample++;
  }
  rc = sqlite3_finalize(pStmt);
  if( rc==SQLITE_OK ) initAvgEq(pPrevIdx);
  return rc;
................................................................................
    return SQLITE_ERROR;
  }

  /* Load new statistics out of the sqlite_stat1 table */
  zSql = sqlite3MPrintf(db, 
      "SELECT tbl,idx,stat FROM %Q.sqlite_stat1", sInfo.zDatabase);
  if( zSql==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }else{
    rc = sqlite3_exec(db, zSql, analysisLoader, &sInfo, 0);
    sqlite3DbFree(db, zSql);
  }


  /* Load the statistics from the sqlite_stat4 table. */

  if( rc==SQLITE_CONSTRAINT ){
    rc = SQLITE_ERROR;
    zErrDyn = sqlite3MPrintf(db, "database is already attached");
  }else if( rc==SQLITE_OK ){
    Pager *pPager;
    aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt);
    if( !aNew->pSchema ){
      rc = SQLITE_NOMEM;
    }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){
      zErrDyn = sqlite3MPrintf(db, 
        "attached databases must use the same text encoding as main database");
      rc = SQLITE_ERROR;
    }
    sqlite3BtreeEnter(aNew->pBt);
    pPager = sqlite3BtreePager(aNew->pBt);
................................................................................
                      PAGER_SYNCHRONOUS_FULL | (db->flags & PAGER_FLAGS_MASK));
#endif
    sqlite3BtreeLeave(aNew->pBt);
  }
  aNew->safety_level = 3;
  aNew->zName = sqlite3DbStrDup(db, zName);
  if( rc==SQLITE_OK && aNew->zName==0 ){
    rc = SQLITE_NOMEM;
  }


#ifdef SQLITE_HAS_CODEC
  if( rc==SQLITE_OK ){
    extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
    extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
................................................................................
    1,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    detachFunc,       /* xSFunc */
    0,                /* xFinalize */
    "sqlite_detach",  /* zName */
    0,                /* pHash */
    0                 /* pDestructor */
  };
  codeAttach(pParse, SQLITE_DETACH, &detach_func, pDbname, 0, 0, pDbname);
}

/*
** Called by the parser to compile an ATTACH statement.
**
................................................................................
    3,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    attachFunc,       /* xSFunc */
    0,                /* xFinalize */
    "sqlite_attach",  /* zName */
    0,                /* pHash */
    0                 /* pDestructor */
  };
  codeAttach(pParse, SQLITE_ATTACH, &attach_func, p, p, pDbname, pKey);
}
#endif /* SQLITE_OMIT_ATTACH */

/*
** Initialize a DbFixer structure.  This routine must be called prior

  if( rc==SQLITE_CONSTRAINT ){
    rc = SQLITE_ERROR;
    zErrDyn = sqlite3MPrintf(db, "database is already attached");
  }else if( rc==SQLITE_OK ){
    Pager *pPager;
    aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt);
    if( !aNew->pSchema ){
      rc = SQLITE_NOMEM_BKPT;
    }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){
      zErrDyn = sqlite3MPrintf(db, 
        "attached databases must use the same text encoding as main database");
      rc = SQLITE_ERROR;
    }
    sqlite3BtreeEnter(aNew->pBt);
    pPager = sqlite3BtreePager(aNew->pBt);
................................................................................
                      PAGER_SYNCHRONOUS_FULL | (db->flags & PAGER_FLAGS_MASK));
#endif
    sqlite3BtreeLeave(aNew->pBt);
  }
  aNew->safety_level = 3;
  aNew->zName = sqlite3DbStrDup(db, zName);
  if( rc==SQLITE_OK && aNew->zName==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }


#ifdef SQLITE_HAS_CODEC
  if( rc==SQLITE_OK ){
    extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
    extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
................................................................................
    1,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    detachFunc,       /* xSFunc */
    0,                /* xFinalize */
    "sqlite_detach",  /* zName */
    {0}

  };
  codeAttach(pParse, SQLITE_DETACH, &detach_func, pDbname, 0, 0, pDbname);
}

/*
** Called by the parser to compile an ATTACH statement.
**
................................................................................
    3,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    attachFunc,       /* xSFunc */
    0,                /* xFinalize */
    "sqlite_attach",  /* zName */
    {0}

  };
  codeAttach(pParse, SQLITE_ATTACH, &attach_func, p, p, pDbname, pKey);
}
#endif /* SQLITE_OMIT_ATTACH */

/*
** Initialize a DbFixer structure.  This routine must be called prior

  if( i==1 ){
    Parse *pParse;
    int rc = 0;
    pParse = sqlite3StackAllocZero(pErrorDb, sizeof(*pParse));
    if( pParse==0 ){
      sqlite3ErrorWithMsg(pErrorDb, SQLITE_NOMEM, "out of memory");
      rc = SQLITE_NOMEM;
    }else{
      pParse->db = pDb;
      if( sqlite3OpenTempDatabase(pParse) ){
        sqlite3ErrorWithMsg(pErrorDb, pParse->rc, "%s", pParse->zErrMsg);
        rc = SQLITE_ERROR;
      }
      sqlite3DbFree(pErrorDb, pParse->zErrMsg);
................................................................................
  }else {
    /* Allocate space for a new sqlite3_backup object...
    ** EVIDENCE-OF: R-64852-21591 The sqlite3_backup object is created by a
    ** call to sqlite3_backup_init() and is destroyed by a call to
    ** sqlite3_backup_finish(). */
    p = (sqlite3_backup *)sqlite3MallocZero(sizeof(sqlite3_backup));
    if( !p ){
      sqlite3Error(pDestDb, SQLITE_NOMEM);
    }
  }

  /* If the allocation succeeded, populate the new object. */
  if( p ){
    p->pSrc = findBtree(pDestDb, pSrcDb, zSrcDb);
    p->pDest = findBtree(pDestDb, pDestDb, zDestDb);
................................................................................
      TESTONLY( int rc2 );
      TESTONLY( rc2  = ) sqlite3BtreeCommitPhaseOne(p->pSrc, 0);
      TESTONLY( rc2 |= ) sqlite3BtreeCommitPhaseTwo(p->pSrc, 0);
      assert( rc2==SQLITE_OK );
    }
  
    if( rc==SQLITE_IOERR_NOMEM ){
      rc = SQLITE_NOMEM;
    }
    p->rc = rc;
  }
  if( p->pDestDb ){
    sqlite3_mutex_leave(p->pDestDb->mutex);
  }
  sqlite3BtreeLeave(p->pSrc);

  if( i==1 ){
    Parse *pParse;
    int rc = 0;
    pParse = sqlite3StackAllocZero(pErrorDb, sizeof(*pParse));
    if( pParse==0 ){
      sqlite3ErrorWithMsg(pErrorDb, SQLITE_NOMEM, "out of memory");
      rc = SQLITE_NOMEM_BKPT;
    }else{
      pParse->db = pDb;
      if( sqlite3OpenTempDatabase(pParse) ){
        sqlite3ErrorWithMsg(pErrorDb, pParse->rc, "%s", pParse->zErrMsg);
        rc = SQLITE_ERROR;
      }
      sqlite3DbFree(pErrorDb, pParse->zErrMsg);
................................................................................
  }else {
    /* Allocate space for a new sqlite3_backup object...
    ** EVIDENCE-OF: R-64852-21591 The sqlite3_backup object is created by a
    ** call to sqlite3_backup_init() and is destroyed by a call to
    ** sqlite3_backup_finish(). */
    p = (sqlite3_backup *)sqlite3MallocZero(sizeof(sqlite3_backup));
    if( !p ){
      sqlite3Error(pDestDb, SQLITE_NOMEM_BKPT);
    }
  }

  /* If the allocation succeeded, populate the new object. */
  if( p ){
    p->pSrc = findBtree(pDestDb, pSrcDb, zSrcDb);
    p->pDest = findBtree(pDestDb, pDestDb, zDestDb);
................................................................................
      TESTONLY( int rc2 );
      TESTONLY( rc2  = ) sqlite3BtreeCommitPhaseOne(p->pSrc, 0);
      TESTONLY( rc2 |= ) sqlite3BtreeCommitPhaseTwo(p->pSrc, 0);
      assert( rc2==SQLITE_OK );
    }
  
    if( rc==SQLITE_IOERR_NOMEM ){
      rc = SQLITE_NOMEM_BKPT;
    }
    p->rc = rc;
  }
  if( p->pDestDb ){
    sqlite3_mutex_leave(p->pDestDb->mutex);
  }
  sqlite3BtreeLeave(p->pSrc);

  assert( i<=p->iSize );
  i--;
  while((p->iSize > BITVEC_NBIT) && p->iDivisor) {
    u32 bin = i/p->iDivisor;
    i = i%p->iDivisor;
    if( p->u.apSub[bin]==0 ){
      p->u.apSub[bin] = sqlite3BitvecCreate( p->iDivisor );
      if( p->u.apSub[bin]==0 ) return SQLITE_NOMEM;
    }
    p = p->u.apSub[bin];
  }
  if( p->iSize<=BITVEC_NBIT ){
    p->u.aBitmap[i/BITVEC_SZELEM] |= 1 << (i&(BITVEC_SZELEM-1));
    return SQLITE_OK;
  }
................................................................................
  /* make our hash too "full".  */
bitvec_set_rehash:
  if( p->nSet>=BITVEC_MXHASH ){
    unsigned int j;
    int rc;
    u32 *aiValues = sqlite3StackAllocRaw(0, sizeof(p->u.aHash));
    if( aiValues==0 ){
      return SQLITE_NOMEM;
    }else{
      memcpy(aiValues, p->u.aHash, sizeof(p->u.aHash));
      memset(p->u.apSub, 0, sizeof(p->u.apSub));
      p->iDivisor = (p->iSize + BITVEC_NPTR - 1)/BITVEC_NPTR;
      rc = sqlite3BitvecSet(p, i);
      for(j=0; j<BITVEC_NINT; j++){
        if( aiValues[j] ) rc |= sqlite3BitvecSet(p, aiValues[j]);

  assert( i<=p->iSize );
  i--;
  while((p->iSize > BITVEC_NBIT) && p->iDivisor) {
    u32 bin = i/p->iDivisor;
    i = i%p->iDivisor;
    if( p->u.apSub[bin]==0 ){
      p->u.apSub[bin] = sqlite3BitvecCreate( p->iDivisor );
      if( p->u.apSub[bin]==0 ) return SQLITE_NOMEM_BKPT;
    }
    p = p->u.apSub[bin];
  }
  if( p->iSize<=BITVEC_NBIT ){
    p->u.aBitmap[i/BITVEC_SZELEM] |= 1 << (i&(BITVEC_SZELEM-1));
    return SQLITE_OK;
  }
................................................................................
  /* make our hash too "full".  */
bitvec_set_rehash:
  if( p->nSet>=BITVEC_MXHASH ){
    unsigned int j;
    int rc;
    u32 *aiValues = sqlite3StackAllocRaw(0, sizeof(p->u.aHash));
    if( aiValues==0 ){
      return SQLITE_NOMEM_BKPT;
    }else{
      memcpy(aiValues, p->u.aHash, sizeof(p->u.aHash));
      memset(p->u.apSub, 0, sizeof(p->u.apSub));
      p->iDivisor = (p->iSize + BITVEC_NPTR - 1)/BITVEC_NPTR;
      rc = sqlite3BitvecSet(p, i);
      for(j=0; j<BITVEC_NINT; j++){
        if( aiValues[j] ) rc |= sqlite3BitvecSet(p, aiValues[j]);

  /* If the above search did not find a BtLock struct associating Btree p
  ** with table iTable, allocate one and link it into the list.
  */
  if( !pLock ){
    pLock = (BtLock *)sqlite3MallocZero(sizeof(BtLock));
    if( !pLock ){
      return SQLITE_NOMEM;
    }
    pLock->iTable = iTable;
    pLock->pBtree = p;
    pLock->pNext = pBt->pLock;
    pBt->pLock = pLock;
  }

................................................................................
*/
static int btreeSetHasContent(BtShared *pBt, Pgno pgno){
  int rc = SQLITE_OK;
  if( !pBt->pHasContent ){
    assert( pgno<=pBt->nPage );
    pBt->pHasContent = sqlite3BitvecCreate(pBt->nPage);
    if( !pBt->pHasContent ){
      rc = SQLITE_NOMEM;
    }
  }
  if( rc==SQLITE_OK && pgno<=sqlite3BitvecSize(pBt->pHasContent) ){
    rc = sqlite3BitvecSet(pBt->pHasContent, pgno);
  }
  return rc;
}
................................................................................
      rc = sqlite3BtreeKey(pCur, 0, (int)pCur->nKey, pKey);
      if( rc==SQLITE_OK ){
        pCur->pKey = pKey;
      }else{
        sqlite3_free(pKey);
      }
    }else{
      rc = SQLITE_NOMEM;
    }
  }
  assert( !pCur->curIntKey || !pCur->pKey );
  return rc;
}

/*
................................................................................
  char *pFree = 0;

  if( pKey ){
    assert( nKey==(i64)(int)nKey );
    pIdxKey = sqlite3VdbeAllocUnpackedRecord(
        pCur->pKeyInfo, aSpace, sizeof(aSpace), &pFree
    );
    if( pIdxKey==0 ) return SQLITE_NOMEM;
    sqlite3VdbeRecordUnpack(pCur->pKeyInfo, (int)nKey, pKey, pIdxKey);
    if( pIdxKey->nField==0 ){
      sqlite3DbFree(pCur->pKeyInfo->db, pFree);
      return SQLITE_CORRUPT_BKPT;
    }
  }else{
    pIdxKey = 0;
................................................................................
    flags |= BTREE_MEMORY;
  }
  if( (vfsFlags & SQLITE_OPEN_MAIN_DB)!=0 && (isMemdb || isTempDb) ){
    vfsFlags = (vfsFlags & ~SQLITE_OPEN_MAIN_DB) | SQLITE_OPEN_TEMP_DB;
  }
  p = sqlite3MallocZero(sizeof(Btree));
  if( !p ){
    return SQLITE_NOMEM;
  }
  p->inTrans = TRANS_NONE;
  p->db = db;
#ifndef SQLITE_OMIT_SHARED_CACHE
  p->lock.pBtree = p;
  p->lock.iTable = 1;
#endif
................................................................................
      int nFullPathname = pVfs->mxPathname+1;
      char *zFullPathname = sqlite3Malloc(MAX(nFullPathname,nFilename));
      MUTEX_LOGIC( sqlite3_mutex *mutexShared; )

      p->sharable = 1;
      if( !zFullPathname ){
        sqlite3_free(p);
        return SQLITE_NOMEM;
      }
      if( isMemdb ){
        memcpy(zFullPathname, zFilename, nFilename);
      }else{
        rc = sqlite3OsFullPathname(pVfs, zFilename,
                                   nFullPathname, zFullPathname);
        if( rc ){
................................................................................
    assert( sizeof(u64)==8 );
    assert( sizeof(u32)==4 );
    assert( sizeof(u16)==2 );
    assert( sizeof(Pgno)==4 );
  
    pBt = sqlite3MallocZero( sizeof(*pBt) );
    if( pBt==0 ){
      rc = SQLITE_NOMEM;
      goto btree_open_out;
    }
    rc = sqlite3PagerOpen(pVfs, &pBt->pPager, zFilename,
                          EXTRA_SIZE, flags, vfsFlags, pageReinit);
    if( rc==SQLITE_OK ){
      sqlite3PagerSetMmapLimit(pBt->pPager, db->szMmap);
      rc = sqlite3PagerReadFileheader(pBt->pPager,sizeof(zDbHeader),zDbHeader);
................................................................................
    if( p->sharable ){
      MUTEX_LOGIC( sqlite3_mutex *mutexShared; )
      pBt->nRef = 1;
      MUTEX_LOGIC( mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);)
      if( SQLITE_THREADSAFE && sqlite3GlobalConfig.bCoreMutex ){
        pBt->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_FAST);
        if( pBt->mutex==0 ){
          rc = SQLITE_NOMEM;
          goto btree_open_out;
        }
      }
      sqlite3_mutex_enter(mutexShared);
      pBt->pNext = GLOBAL(BtShared*,sqlite3SharedCacheList);
      GLOBAL(BtShared*,sqlite3SharedCacheList) = pBt;
      sqlite3_mutex_leave(mutexShared);
................................................................................
  sqlite3BtreeEnter(p);
  sqlite3PagerSetFlags(pBt->pPager, pgFlags);
  sqlite3BtreeLeave(p);
  return SQLITE_OK;
}
#endif

/*
** Return TRUE if the given btree is set to safety level 1.  In other
** words, return TRUE if no sync() occurs on the disk files.
*/
int sqlite3BtreeSyncDisabled(Btree *p){
  BtShared *pBt = p->pBt;
  int rc;
  assert( sqlite3_mutex_held(p->db->mutex) );  
  sqlite3BtreeEnter(p);
  assert( pBt && pBt->pPager );
  rc = sqlite3PagerNosync(pBt->pPager);
  sqlite3BtreeLeave(p);
  return rc;
}

/*
** Change the default pages size and the number of reserved bytes per page.
** Or, if the page size has already been fixed, return SQLITE_READONLY 
** without changing anything.
**
** The page size must be a power of 2 between 512 and 65536.  If the page
** size supplied does not meet this constraint then the page size is not
................................................................................
  assert( p->inTrans>TRANS_NONE );
  assert( wrFlag==0 || p->inTrans==TRANS_WRITE );
  assert( pBt->pPage1 && pBt->pPage1->aData );
  assert( wrFlag==0 || (pBt->btsFlags & BTS_READ_ONLY)==0 );

  if( wrFlag ){
    allocateTempSpace(pBt);
    if( pBt->pTmpSpace==0 ) return SQLITE_NOMEM;
  }
  if( iTable==1 && btreePagecount(pBt)==0 ){
    assert( wrFlag==0 );
    iTable = 0;
  }

  /* Now that no other errors can occur, finish filling in the BtCursor
................................................................................
    if( eOp!=2 && (pCur->curFlags & BTCF_ValidOvfl)==0 ){
      int nOvfl = (pCur->info.nPayload-pCur->info.nLocal+ovflSize-1)/ovflSize;
      if( nOvfl>pCur->nOvflAlloc ){
        Pgno *aNew = (Pgno*)sqlite3Realloc(
            pCur->aOverflow, nOvfl*2*sizeof(Pgno)
        );
        if( aNew==0 ){
          rc = SQLITE_NOMEM;
        }else{
          pCur->nOvflAlloc = nOvfl*2;
          pCur->aOverflow = aNew;
        }
      }
      if( rc==SQLITE_OK ){
        memset(pCur->aOverflow, 0, nOvfl*sizeof(Pgno));
................................................................................
          testcase( nCell==2 );  /* Minimum legal index key size */
          if( nCell<2 ){
            rc = SQLITE_CORRUPT_BKPT;
            goto moveto_finish;
          }
          pCellKey = sqlite3Malloc( nCell+18 );
          if( pCellKey==0 ){
            rc = SQLITE_NOMEM;
            goto moveto_finish;
          }
          pCur->aiIdx[pCur->iPage] = (u16)idx;
          rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 2);
          if( rc ){
            sqlite3_free(pCellKey);
            goto moveto_finish;
................................................................................
  ** index iParentIdx. This scenario comes about when this function
  ** is called (indirectly) from sqlite3BtreeDelete().
  */
  assert( pParent->nOverflow==0 || pParent->nOverflow==1 );
  assert( pParent->nOverflow==0 || pParent->aiOvfl[0]==iParentIdx );

  if( !aOvflSpace ){
    return SQLITE_NOMEM;
  }

  /* Find the sibling pages to balance. Also locate the cells in pParent 
  ** that divide the siblings. An attempt is made to find NN siblings on 
  ** either side of pPage. More siblings are taken from one side, however, 
  ** if there are fewer than NN siblings on the other side. If pParent
  ** has NB or fewer children then all children of pParent are taken.  
................................................................................
     + pBt->pageSize;                              /* aSpace1 */

  /* EVIDENCE-OF: R-28375-38319 SQLite will never request a scratch buffer
  ** that is more than 6 times the database page size. */
  assert( szScratch<=6*(int)pBt->pageSize );
  b.apCell = sqlite3ScratchMalloc( szScratch ); 
  if( b.apCell==0 ){
    rc = SQLITE_NOMEM;
    goto balance_cleanup;
  }
  b.szCell = (u16*)&b.apCell[nMaxCells];
  aSpace1 = (u8*)&b.szCell[nMaxCells];
  assert( EIGHT_BYTE_ALIGNMENT(aSpace1) );

  /*

  /* If the above search did not find a BtLock struct associating Btree p
  ** with table iTable, allocate one and link it into the list.
  */
  if( !pLock ){
    pLock = (BtLock *)sqlite3MallocZero(sizeof(BtLock));
    if( !pLock ){
      return SQLITE_NOMEM_BKPT;
    }
    pLock->iTable = iTable;
    pLock->pBtree = p;
    pLock->pNext = pBt->pLock;
    pBt->pLock = pLock;
  }

................................................................................
*/
static int btreeSetHasContent(BtShared *pBt, Pgno pgno){
  int rc = SQLITE_OK;
  if( !pBt->pHasContent ){
    assert( pgno<=pBt->nPage );
    pBt->pHasContent = sqlite3BitvecCreate(pBt->nPage);
    if( !pBt->pHasContent ){
      rc = SQLITE_NOMEM_BKPT;
    }
  }
  if( rc==SQLITE_OK && pgno<=sqlite3BitvecSize(pBt->pHasContent) ){
    rc = sqlite3BitvecSet(pBt->pHasContent, pgno);
  }
  return rc;
}
................................................................................
      rc = sqlite3BtreeKey(pCur, 0, (int)pCur->nKey, pKey);
      if( rc==SQLITE_OK ){
        pCur->pKey = pKey;
      }else{
        sqlite3_free(pKey);
      }
    }else{
      rc = SQLITE_NOMEM_BKPT;
    }
  }
  assert( !pCur->curIntKey || !pCur->pKey );
  return rc;
}

/*
................................................................................
  char *pFree = 0;

  if( pKey ){
    assert( nKey==(i64)(int)nKey );
    pIdxKey = sqlite3VdbeAllocUnpackedRecord(
        pCur->pKeyInfo, aSpace, sizeof(aSpace), &pFree
    );
    if( pIdxKey==0 ) return SQLITE_NOMEM_BKPT;
    sqlite3VdbeRecordUnpack(pCur->pKeyInfo, (int)nKey, pKey, pIdxKey);
    if( pIdxKey->nField==0 ){
      sqlite3DbFree(pCur->pKeyInfo->db, pFree);
      return SQLITE_CORRUPT_BKPT;
    }
  }else{
    pIdxKey = 0;
................................................................................
    flags |= BTREE_MEMORY;
  }
  if( (vfsFlags & SQLITE_OPEN_MAIN_DB)!=0 && (isMemdb || isTempDb) ){
    vfsFlags = (vfsFlags & ~SQLITE_OPEN_MAIN_DB) | SQLITE_OPEN_TEMP_DB;
  }
  p = sqlite3MallocZero(sizeof(Btree));
  if( !p ){
    return SQLITE_NOMEM_BKPT;
  }
  p->inTrans = TRANS_NONE;
  p->db = db;
#ifndef SQLITE_OMIT_SHARED_CACHE
  p->lock.pBtree = p;
  p->lock.iTable = 1;
#endif
................................................................................
      int nFullPathname = pVfs->mxPathname+1;
      char *zFullPathname = sqlite3Malloc(MAX(nFullPathname,nFilename));
      MUTEX_LOGIC( sqlite3_mutex *mutexShared; )

      p->sharable = 1;
      if( !zFullPathname ){
        sqlite3_free(p);
        return SQLITE_NOMEM_BKPT;
      }
      if( isMemdb ){
        memcpy(zFullPathname, zFilename, nFilename);
      }else{
        rc = sqlite3OsFullPathname(pVfs, zFilename,
                                   nFullPathname, zFullPathname);
        if( rc ){
................................................................................
    assert( sizeof(u64)==8 );
    assert( sizeof(u32)==4 );
    assert( sizeof(u16)==2 );
    assert( sizeof(Pgno)==4 );
  
    pBt = sqlite3MallocZero( sizeof(*pBt) );
    if( pBt==0 ){
      rc = SQLITE_NOMEM_BKPT;
      goto btree_open_out;
    }
    rc = sqlite3PagerOpen(pVfs, &pBt->pPager, zFilename,
                          EXTRA_SIZE, flags, vfsFlags, pageReinit);
    if( rc==SQLITE_OK ){
      sqlite3PagerSetMmapLimit(pBt->pPager, db->szMmap);
      rc = sqlite3PagerReadFileheader(pBt->pPager,sizeof(zDbHeader),zDbHeader);
................................................................................
    if( p->sharable ){
      MUTEX_LOGIC( sqlite3_mutex *mutexShared; )
      pBt->nRef = 1;
      MUTEX_LOGIC( mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);)
      if( SQLITE_THREADSAFE && sqlite3GlobalConfig.bCoreMutex ){
        pBt->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_FAST);
        if( pBt->mutex==0 ){
          rc = SQLITE_NOMEM_BKPT;
          goto btree_open_out;
        }
      }
      sqlite3_mutex_enter(mutexShared);
      pBt->pNext = GLOBAL(BtShared*,sqlite3SharedCacheList);
      GLOBAL(BtShared*,sqlite3SharedCacheList) = pBt;
      sqlite3_mutex_leave(mutexShared);
................................................................................
  sqlite3BtreeEnter(p);
  sqlite3PagerSetFlags(pBt->pPager, pgFlags);
  sqlite3BtreeLeave(p);
  return SQLITE_OK;
}
#endif
















/*
** Change the default pages size and the number of reserved bytes per page.
** Or, if the page size has already been fixed, return SQLITE_READONLY 
** without changing anything.
**
** The page size must be a power of 2 between 512 and 65536.  If the page
** size supplied does not meet this constraint then the page size is not
................................................................................
  assert( p->inTrans>TRANS_NONE );
  assert( wrFlag==0 || p->inTrans==TRANS_WRITE );
  assert( pBt->pPage1 && pBt->pPage1->aData );
  assert( wrFlag==0 || (pBt->btsFlags & BTS_READ_ONLY)==0 );

  if( wrFlag ){
    allocateTempSpace(pBt);
    if( pBt->pTmpSpace==0 ) return SQLITE_NOMEM_BKPT;
  }
  if( iTable==1 && btreePagecount(pBt)==0 ){
    assert( wrFlag==0 );
    iTable = 0;
  }

  /* Now that no other errors can occur, finish filling in the BtCursor
................................................................................
    if( eOp!=2 && (pCur->curFlags & BTCF_ValidOvfl)==0 ){
      int nOvfl = (pCur->info.nPayload-pCur->info.nLocal+ovflSize-1)/ovflSize;
      if( nOvfl>pCur->nOvflAlloc ){
        Pgno *aNew = (Pgno*)sqlite3Realloc(
            pCur->aOverflow, nOvfl*2*sizeof(Pgno)
        );
        if( aNew==0 ){
          rc = SQLITE_NOMEM_BKPT;
        }else{
          pCur->nOvflAlloc = nOvfl*2;
          pCur->aOverflow = aNew;
        }
      }
      if( rc==SQLITE_OK ){
        memset(pCur->aOverflow, 0, nOvfl*sizeof(Pgno));
................................................................................
          testcase( nCell==2 );  /* Minimum legal index key size */
          if( nCell<2 ){
            rc = SQLITE_CORRUPT_BKPT;
            goto moveto_finish;
          }
          pCellKey = sqlite3Malloc( nCell+18 );
          if( pCellKey==0 ){
            rc = SQLITE_NOMEM_BKPT;
            goto moveto_finish;
          }
          pCur->aiIdx[pCur->iPage] = (u16)idx;
          rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 2);
          if( rc ){
            sqlite3_free(pCellKey);
            goto moveto_finish;
................................................................................
  ** index iParentIdx. This scenario comes about when this function
  ** is called (indirectly) from sqlite3BtreeDelete().
  */
  assert( pParent->nOverflow==0 || pParent->nOverflow==1 );
  assert( pParent->nOverflow==0 || pParent->aiOvfl[0]==iParentIdx );

  if( !aOvflSpace ){
    return SQLITE_NOMEM_BKPT;
  }

  /* Find the sibling pages to balance. Also locate the cells in pParent 
  ** that divide the siblings. An attempt is made to find NN siblings on 
  ** either side of pPage. More siblings are taken from one side, however, 
  ** if there are fewer than NN siblings on the other side. If pParent
  ** has NB or fewer children then all children of pParent are taken.  
................................................................................
     + pBt->pageSize;                              /* aSpace1 */

  /* EVIDENCE-OF: R-28375-38319 SQLite will never request a scratch buffer
  ** that is more than 6 times the database page size. */
  assert( szScratch<=6*(int)pBt->pageSize );
  b.apCell = sqlite3ScratchMalloc( szScratch ); 
  if( b.apCell==0 ){
    rc = SQLITE_NOMEM_BKPT;
    goto balance_cleanup;
  }
  b.szCell = (u16*)&b.apCell[nMaxCells];
  aSpace1 = (u8*)&b.szCell[nMaxCells];
  assert( EIGHT_BYTE_ALIGNMENT(aSpace1) );

  /*

int sqlite3BtreeClose(Btree*);
int sqlite3BtreeSetCacheSize(Btree*,int);
int sqlite3BtreeSetSpillSize(Btree*,int);
#if SQLITE_MAX_MMAP_SIZE>0
  int sqlite3BtreeSetMmapLimit(Btree*,sqlite3_int64);
#endif
int sqlite3BtreeSetPagerFlags(Btree*,unsigned);
int sqlite3BtreeSyncDisabled(Btree*);
int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
int sqlite3BtreeGetPageSize(Btree*);
int sqlite3BtreeMaxPageCount(Btree*,int);
u32 sqlite3BtreeLastPage(Btree*);
int sqlite3BtreeSecureDelete(Btree*,int);
int sqlite3BtreeGetOptimalReserve(Btree*);
int sqlite3BtreeGetReserveNoMutex(Btree *p);

int sqlite3BtreeClose(Btree*);
int sqlite3BtreeSetCacheSize(Btree*,int);
int sqlite3BtreeSetSpillSize(Btree*,int);
#if SQLITE_MAX_MMAP_SIZE>0
  int sqlite3BtreeSetMmapLimit(Btree*,sqlite3_int64);
#endif
int sqlite3BtreeSetPagerFlags(Btree*,unsigned);

int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
int sqlite3BtreeGetPageSize(Btree*);
int sqlite3BtreeMaxPageCount(Btree*,int);
u32 sqlite3BtreeLastPage(Btree*);
int sqlite3BtreeSecureDelete(Btree*,int);
int sqlite3BtreeGetOptimalReserve(Btree*);
int sqlite3BtreeGetReserveNoMutex(Btree *p);

** function returns the index of the named database in db->aDb[], or
** -1 if the named db cannot be found.
*/
int sqlite3FindDbName(sqlite3 *db, const char *zName){
  int i = -1;         /* Database number */
  if( zName ){
    Db *pDb;
    int n = sqlite3Strlen30(zName);
    for(i=(db->nDb-1), pDb=&db->aDb[i]; i>=0; i--, pDb--){
      if( (!OMIT_TEMPDB || i!=1 ) && n==sqlite3Strlen30(pDb->zName) && 
          0==sqlite3StrICmp(pDb->zName, zName) ){
        break;
      }
    }
  }
  return i;
}

/*
** The token *pName contains the name of a database (either "main" or
................................................................................
      goto begin_table_error;
    }
  }

  pTable = sqlite3DbMallocZero(db, sizeof(Table));
  if( pTable==0 ){
    assert( db->mallocFailed );
    pParse->rc = SQLITE_NOMEM;
    pParse->nErr++;
    goto begin_table_error;
  }
  pTable->zName = zName;
  pTable->iPKey = -1;
  pTable->pSchema = db->aDb[iDb].pSchema;
  pTable->nRef = 1;
................................................................................
static int resizeIndexObject(sqlite3 *db, Index *pIdx, int N){
  char *zExtra;
  int nByte;
  if( pIdx->nColumn>=N ) return SQLITE_OK;
  assert( pIdx->isResized==0 );
  nByte = (sizeof(char*) + sizeof(i16) + 1)*N;
  zExtra = sqlite3DbMallocZero(db, nByte);
  if( zExtra==0 ) return SQLITE_NOMEM;
  memcpy(zExtra, pIdx->azColl, sizeof(char*)*pIdx->nColumn);
  pIdx->azColl = (const char**)zExtra;
  zExtra += sizeof(char*)*N;
  memcpy(zExtra, pIdx->aiColumn, sizeof(i16)*pIdx->nColumn);
  pIdx->aiColumn = (i16*)zExtra;
  zExtra += sizeof(i16)*N;
  memcpy(zExtra, pIdx->aSortOrder, pIdx->nColumn);
................................................................................
    assert( i==pIndex->nColumn );
  }else{
    pIndex->aiColumn[i] = XN_ROWID;
    pIndex->azColl[i] = sqlite3StrBINARY;
  }
  sqlite3DefaultRowEst(pIndex);
  if( pParse->pNewTable==0 ) estimateIndexWidth(pIndex);















  if( pTab==pParse->pNewTable ){
    /* This routine has been called to create an automatic index as a
    ** result of a PRIMARY KEY or UNIQUE clause on a column definition, or
    ** a PRIMARY KEY or UNIQUE clause following the column definitions.
    ** i.e. one of:
    **
................................................................................
      for(k=0; k<pIdx->nKeyCol; k++){
        const char *z1;
        const char *z2;
        assert( pIdx->aiColumn[k]>=0 );
        if( pIdx->aiColumn[k]!=pIndex->aiColumn[k] ) break;
        z1 = pIdx->azColl[k];
        z2 = pIndex->azColl[k];
        if( z1!=z2 && sqlite3StrICmp(z1, z2) ) break;
      }
      if( k==pIdx->nKeyCol ){
        if( pIdx->onError!=pIndex->onError ){
          /* This constraint creates the same index as a previous
          ** constraint specified somewhere in the CREATE TABLE statement.
          ** However the ON CONFLICT clauses are different. If both this 
          ** constraint and the previous equivalent constraint have explicit

** function returns the index of the named database in db->aDb[], or
** -1 if the named db cannot be found.
*/
int sqlite3FindDbName(sqlite3 *db, const char *zName){
  int i = -1;         /* Database number */
  if( zName ){
    Db *pDb;

    for(i=(db->nDb-1), pDb=&db->aDb[i]; i>=0; i--, pDb--){

      if( 0==sqlite3StrICmp(pDb->zName, zName) ) break;


    }
  }
  return i;
}

/*
** The token *pName contains the name of a database (either "main" or
................................................................................
      goto begin_table_error;
    }
  }

  pTable = sqlite3DbMallocZero(db, sizeof(Table));
  if( pTable==0 ){
    assert( db->mallocFailed );
    pParse->rc = SQLITE_NOMEM_BKPT;
    pParse->nErr++;
    goto begin_table_error;
  }
  pTable->zName = zName;
  pTable->iPKey = -1;
  pTable->pSchema = db->aDb[iDb].pSchema;
  pTable->nRef = 1;
................................................................................
static int resizeIndexObject(sqlite3 *db, Index *pIdx, int N){
  char *zExtra;
  int nByte;
  if( pIdx->nColumn>=N ) return SQLITE_OK;
  assert( pIdx->isResized==0 );
  nByte = (sizeof(char*) + sizeof(i16) + 1)*N;
  zExtra = sqlite3DbMallocZero(db, nByte);
  if( zExtra==0 ) return SQLITE_NOMEM_BKPT;
  memcpy(zExtra, pIdx->azColl, sizeof(char*)*pIdx->nColumn);
  pIdx->azColl = (const char**)zExtra;
  zExtra += sizeof(char*)*N;
  memcpy(zExtra, pIdx->aiColumn, sizeof(i16)*pIdx->nColumn);
  pIdx->aiColumn = (i16*)zExtra;
  zExtra += sizeof(i16)*N;
  memcpy(zExtra, pIdx->aSortOrder, pIdx->nColumn);
................................................................................
    assert( i==pIndex->nColumn );
  }else{
    pIndex->aiColumn[i] = XN_ROWID;
    pIndex->azColl[i] = sqlite3StrBINARY;
  }
  sqlite3DefaultRowEst(pIndex);
  if( pParse->pNewTable==0 ) estimateIndexWidth(pIndex);

  /* If this index contains every column of its table, then mark
  ** it as a covering index */
  assert( HasRowid(pTab) 
      || pTab->iPKey<0 || sqlite3ColumnOfIndex(pIndex, pTab->iPKey)>=0 );
  if( pTblName!=0 && pIndex->nColumn>=pTab->nCol ){
    pIndex->isCovering = 1;
    for(j=0; j<pTab->nCol; j++){
      if( j==pTab->iPKey ) continue;
      if( sqlite3ColumnOfIndex(pIndex,j)>=0 ) continue;
      pIndex->isCovering = 0;
      break;
    }
  }

  if( pTab==pParse->pNewTable ){
    /* This routine has been called to create an automatic index as a
    ** result of a PRIMARY KEY or UNIQUE clause on a column definition, or
    ** a PRIMARY KEY or UNIQUE clause following the column definitions.
    ** i.e. one of:
    **
................................................................................
      for(k=0; k<pIdx->nKeyCol; k++){
        const char *z1;
        const char *z2;
        assert( pIdx->aiColumn[k]>=0 );
        if( pIdx->aiColumn[k]!=pIndex->aiColumn[k] ) break;
        z1 = pIdx->azColl[k];
        z2 = pIndex->azColl[k];
        if( sqlite3StrICmp(z1, z2) ) break;
      }
      if( k==pIdx->nKeyCol ){
        if( pIdx->onError!=pIndex->onError ){
          /* This constraint creates the same index as a previous
          ** constraint specified somewhere in the CREATE TABLE statement.
          ** However the ON CONFLICT clauses are different. If both this 
          ** constraint and the previous equivalent constraint have explicit

}

/*
** Search a FuncDefHash for a function with the given name.  Return
** a pointer to the matching FuncDef if found, or 0 if there is no match.
*/
static FuncDef *functionSearch(
  FuncDefHash *pHash,  /* Hash table to search */
  int h,               /* Hash of the name */
  const char *zFunc,   /* Name of function */
  int nFunc            /* Number of bytes in zFunc */
){
  FuncDef *p;
  for(p=pHash->a[h]; p; p=p->pHash){
    if( sqlite3StrNICmp(p->zName, zFunc, nFunc)==0 && p->zName[nFunc]==0 ){


      return p;
    }
  }
  return 0;
}

/*
** Insert a new FuncDef into a FuncDefHash hash table.
*/
void sqlite3FuncDefInsert(
  FuncDefHash *pHash,  /* The hash table into which to insert */
  FuncDef *pDef        /* The function definition to insert */
){


  FuncDef *pOther;

  int nName = sqlite3Strlen30(pDef->zName);
  u8 c1 = (u8)pDef->zName[0];
  int h = (sqlite3UpperToLower[c1] + nName) % ArraySize(pHash->a);
  pOther = functionSearch(pHash, h, pDef->zName, nName);
  if( pOther ){
    assert( pOther!=pDef && pOther->pNext!=pDef );

    pDef->pNext = pOther->pNext;
    pOther->pNext = pDef;
  }else{
    pDef->pNext = 0;
    pDef->pHash = pHash->a[h];
    pHash->a[h] = pDef;



  }
}
  
  

/*
** Locate a user function given a name, a number of arguments and a flag
................................................................................
**
** If createFlag is false, then a function with the required name and
** number of arguments may be returned even if the eTextRep flag does not
** match that requested.
*/
FuncDef *sqlite3FindFunction(
  sqlite3 *db,       /* An open database */
  const char *zName, /* Name of the function.  Not null-terminated */
  int nName,         /* Number of characters in the name */
  int nArg,          /* Number of arguments.  -1 means any number */
  u8 enc,            /* Preferred text encoding */
  u8 createFlag      /* Create new entry if true and does not otherwise exist */
){
  FuncDef *p;         /* Iterator variable */
  FuncDef *pBest = 0; /* Best match found so far */
  int bestScore = 0;  /* Score of best match */
  int h;              /* Hash value */


  assert( nArg>=(-2) );
  assert( nArg>=(-1) || createFlag==0 );
  h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % ArraySize(db->aFunc.a);

  /* First search for a match amongst the application-defined functions.
  */
  p = functionSearch(&db->aFunc, h, zName, nName);
  while( p ){
    int score = matchQuality(p, nArg, enc);
    if( score>bestScore ){
      pBest = p;
      bestScore = score;
    }
    p = p->pNext;
................................................................................
  ** Except, if createFlag is true, that means that we are trying to
  ** install a new function.  Whatever FuncDef structure is returned it will
  ** have fields overwritten with new information appropriate for the
  ** new function.  But the FuncDefs for built-in functions are read-only.
  ** So we must not search for built-ins when creating a new function.
  */ 
  if( !createFlag && (pBest==0 || (db->flags & SQLITE_PreferBuiltin)!=0) ){
    FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
    bestScore = 0;
    p = functionSearch(pHash, h, zName, nName);
    while( p ){
      int score = matchQuality(p, nArg, enc);
      if( score>bestScore ){
        pBest = p;
        bestScore = score;
      }
      p = p->pNext;
................................................................................

  /* If the createFlag parameter is true and the search did not reveal an
  ** exact match for the name, number of arguments and encoding, then add a
  ** new entry to the hash table and return it.
  */
  if( createFlag && bestScore<FUNC_PERFECT_MATCH && 
      (pBest = sqlite3DbMallocZero(db, sizeof(*pBest)+nName+1))!=0 ){

    pBest->zName = (char *)&pBest[1];
    pBest->nArg = (u16)nArg;
    pBest->funcFlags = enc;
    memcpy(pBest->zName, zName, nName);
    pBest->zName[nName] = 0;
    sqlite3FuncDefInsert(&db->aFunc, pBest);







  }

  if( pBest && (pBest->xSFunc || createFlag) ){
    return pBest;
  }
  return 0;
}

}

/*
** Search a FuncDefHash for a function with the given name.  Return
** a pointer to the matching FuncDef if found, or 0 if there is no match.
*/
static FuncDef *functionSearch(

  int h,               /* Hash of the name */
  const char *zFunc    /* Name of function */

){
  FuncDef *p;


  for(p=sqlite3BuiltinFunctions.a[h]; p; p=p->u.pHash){
    if( sqlite3StrICmp(p->zName, zFunc)==0 ){
      return p;
    }
  }
  return 0;
}

/*
** Insert a new FuncDef into a FuncDefHash hash table.
*/
void sqlite3InsertBuiltinFuncs(
  FuncDef *aDef,      /* List of global functions to be inserted */
  int nDef            /* Length of the apDef[] list */
){
  int i;
  for(i=0; i<nDef; i++){
    FuncDef *pOther;
    const char *zName = aDef[i].zName;
    int nName = sqlite3Strlen30(zName);

    int h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % SQLITE_FUNC_HASH_SZ;
    pOther = functionSearch(h, zName);
    if( pOther ){

      assert( pOther!=&aDef[i] && pOther->pNext!=&aDef[i] );
      aDef[i].pNext = pOther->pNext;
      pOther->pNext = &aDef[i];
    }else{
      aDef[i].pNext = 0;


      aDef[i].u.pHash = sqlite3BuiltinFunctions.a[h];
      sqlite3BuiltinFunctions.a[h] = &aDef[i];
    }
  }
}
  
  

/*
** Locate a user function given a name, a number of arguments and a flag
................................................................................
**
** If createFlag is false, then a function with the required name and
** number of arguments may be returned even if the eTextRep flag does not
** match that requested.
*/
FuncDef *sqlite3FindFunction(
  sqlite3 *db,       /* An open database */
  const char *zName, /* Name of the function.  zero-terminated */

  int nArg,          /* Number of arguments.  -1 means any number */
  u8 enc,            /* Preferred text encoding */
  u8 createFlag      /* Create new entry if true and does not otherwise exist */
){
  FuncDef *p;         /* Iterator variable */
  FuncDef *pBest = 0; /* Best match found so far */
  int bestScore = 0;  /* Score of best match */
  int h;              /* Hash value */
  int nName;          /* Length of the name */

  assert( nArg>=(-2) );
  assert( nArg>=(-1) || createFlag==0 );
  nName = sqlite3Strlen30(zName);

  /* First search for a match amongst the application-defined functions.
  */
  p = (FuncDef*)sqlite3HashFind(&db->aFunc, zName);
  while( p ){
    int score = matchQuality(p, nArg, enc);
    if( score>bestScore ){
      pBest = p;
      bestScore = score;
    }
    p = p->pNext;
................................................................................
  ** Except, if createFlag is true, that means that we are trying to
  ** install a new function.  Whatever FuncDef structure is returned it will
  ** have fields overwritten with new information appropriate for the
  ** new function.  But the FuncDefs for built-in functions are read-only.
  ** So we must not search for built-ins when creating a new function.
  */ 
  if( !createFlag && (pBest==0 || (db->flags & SQLITE_PreferBuiltin)!=0) ){
    bestScore = 0;
    h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % SQLITE_FUNC_HASH_SZ;
    p = functionSearch(h, zName);
    while( p ){
      int score = matchQuality(p, nArg, enc);
      if( score>bestScore ){
        pBest = p;
        bestScore = score;
      }
      p = p->pNext;
................................................................................

  /* If the createFlag parameter is true and the search did not reveal an
  ** exact match for the name, number of arguments and encoding, then add a
  ** new entry to the hash table and return it.
  */
  if( createFlag && bestScore<FUNC_PERFECT_MATCH && 
      (pBest = sqlite3DbMallocZero(db, sizeof(*pBest)+nName+1))!=0 ){
    FuncDef *pOther;
    pBest->zName = (const char*)&pBest[1];
    pBest->nArg = (u16)nArg;
    pBest->funcFlags = enc;
    memcpy((char*)&pBest[1], zName, nName+1);

    pOther = (FuncDef*)sqlite3HashInsert(&db->aFunc, pBest->zName, pBest);
    if( pOther==pBest ){
      sqlite3DbFree(db, pBest);
      sqlite3OomFault(db);
      return 0;
    }else{
      pBest->pNext = pOther;
    }
  }

  if( pBest && (pBest->xSFunc || createFlag) ){
    return pBest;
  }
  return 0;
}

#endif
  pVal = sqlite3ValueNew(0);
  sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
  zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
  if( zSql8 ){
    rc = sqlite3_complete(zSql8);
  }else{
    rc = SQLITE_NOMEM;
  }
  sqlite3ValueFree(pVal);
  return rc & 0xff;
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_OMIT_COMPLETE */

#endif
  pVal = sqlite3ValueNew(0);
  sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
  zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
  if( zSql8 ){
    rc = sqlite3_complete(zSql8);
  }else{
    rc = SQLITE_NOMEM_BKPT;
  }
  sqlite3ValueFree(pVal);
  return rc & 0xff;
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_OMIT_COMPLETE */

/*
** This function registered all of the above C functions as SQL
** functions.  This should be the only routine in this file with
** external linkage.
*/
void sqlite3RegisterDateTimeFunctions(void){
  static SQLITE_WSD FuncDef aDateTimeFuncs[] = {
#ifndef SQLITE_OMIT_DATETIME_FUNCS
    DFUNCTION(julianday,        -1, 0, 0, juliandayFunc ),
    DFUNCTION(date,             -1, 0, 0, dateFunc      ),
    DFUNCTION(time,             -1, 0, 0, timeFunc      ),
    DFUNCTION(datetime,         -1, 0, 0, datetimeFunc  ),
    DFUNCTION(strftime,         -1, 0, 0, strftimeFunc  ),
    DFUNCTION(current_time,      0, 0, 0, ctimeFunc     ),
................................................................................
    DFUNCTION(current_date,      0, 0, 0, cdateFunc     ),
#else
    STR_FUNCTION(current_time,      0, "%H:%M:%S",          0, currentTimeFunc),
    STR_FUNCTION(current_date,      0, "%Y-%m-%d",          0, currentTimeFunc),
    STR_FUNCTION(current_timestamp, 0, "%Y-%m-%d %H:%M:%S", 0, currentTimeFunc),
#endif
  };
  int i;
  FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
  FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aDateTimeFuncs);

  for(i=0; i<ArraySize(aDateTimeFuncs); i++){
    sqlite3FuncDefInsert(pHash, &aFunc[i]);
  }
}

/*
** This function registered all of the above C functions as SQL
** functions.  This should be the only routine in this file with
** external linkage.
*/
void sqlite3RegisterDateTimeFunctions(void){
  static FuncDef aDateTimeFuncs[] = {
#ifndef SQLITE_OMIT_DATETIME_FUNCS
    DFUNCTION(julianday,        -1, 0, 0, juliandayFunc ),
    DFUNCTION(date,             -1, 0, 0, dateFunc      ),
    DFUNCTION(time,             -1, 0, 0, timeFunc      ),
    DFUNCTION(datetime,         -1, 0, 0, datetimeFunc  ),
    DFUNCTION(strftime,         -1, 0, 0, strftimeFunc  ),
    DFUNCTION(current_time,      0, 0, 0, ctimeFunc     ),
................................................................................
    DFUNCTION(current_date,      0, 0, 0, cdateFunc     ),
#else
    STR_FUNCTION(current_time,      0, "%H:%M:%S",          0, currentTimeFunc),
    STR_FUNCTION(current_date,      0, "%Y-%m-%d",          0, currentTimeFunc),
    STR_FUNCTION(current_timestamp, 0, "%Y-%m-%d %H:%M:%S", 0, currentTimeFunc),
#endif
  };




  sqlite3InsertBuiltinFuncs(aDateTimeFuncs, ArraySize(aDateTimeFuncs));

}

    }
  }else{
    iDb = 0;
  }
  rc = sqlite3_declare_vtab(db, VTAB_SCHEMA);
  if( rc==SQLITE_OK ){
    pTab = (StatTable *)sqlite3_malloc64(sizeof(StatTable));
    if( pTab==0 ) rc = SQLITE_NOMEM;
  }

  assert( rc==SQLITE_OK || pTab==0 );
  if( rc==SQLITE_OK ){
    memset(pTab, 0, sizeof(StatTable));
    pTab->db = db;
    pTab->iDb = iDb;
................................................................................
*/
static int statOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
  StatTable *pTab = (StatTable *)pVTab;
  StatCursor *pCsr;

  pCsr = (StatCursor *)sqlite3_malloc64(sizeof(StatCursor));
  if( pCsr==0 ){
    return SQLITE_NOMEM;
  }else{
    memset(pCsr, 0, sizeof(StatCursor));
    pCsr->base.pVtab = pVTab;
    pCsr->iDb = pTab->iDb;
  }

  *ppCursor = (sqlite3_vtab_cursor *)pCsr;
................................................................................
    int i;                        /* Used to iterate through cells */
    int nUsable;                  /* Usable bytes per page */

    sqlite3BtreeEnter(pBt);
    nUsable = szPage - sqlite3BtreeGetReserveNoMutex(pBt);
    sqlite3BtreeLeave(pBt);
    p->aCell = sqlite3_malloc64((p->nCell+1) * sizeof(StatCell));
    if( p->aCell==0 ) return SQLITE_NOMEM;
    memset(p->aCell, 0, (p->nCell+1) * sizeof(StatCell));

    for(i=0; i<p->nCell; i++){
      StatCell *pCell = &p->aCell[i];

      iOff = get2byte(&aData[nHdr+i*2]);
      if( !isLeaf ){
................................................................................
        assert( nLocal<=(nUsable-35) );
        if( nPayload>(u32)nLocal ){
          int j;
          int nOvfl = ((nPayload - nLocal) + nUsable-4 - 1) / (nUsable - 4);
          pCell->nLastOvfl = (nPayload-nLocal) - (nOvfl-1) * (nUsable-4);
          pCell->nOvfl = nOvfl;
          pCell->aOvfl = sqlite3_malloc64(sizeof(u32)*nOvfl);
          if( pCell->aOvfl==0 ) return SQLITE_NOMEM;
          pCell->aOvfl[0] = sqlite3Get4byte(&aData[iOff+nLocal]);
          for(j=1; j<nOvfl; j++){
            int rc;
            u32 iPrev = pCell->aOvfl[j-1];
            DbPage *pPg = 0;
            rc = sqlite3PagerGet(sqlite3BtreePager(pBt), iPrev, &pPg, 0);
            if( rc!=SQLITE_OK ){
................................................................................
        return sqlite3_reset(pCsr->pStmt);
      }
      rc = sqlite3PagerGet(pPager, iRoot, &pCsr->aPage[0].pPg, 0);
      pCsr->aPage[0].iPgno = iRoot;
      pCsr->aPage[0].iCell = 0;
      pCsr->aPage[0].zPath = z = sqlite3_mprintf("/");
      pCsr->iPage = 0;
      if( z==0 ) rc = SQLITE_NOMEM;
    }else{
      pCsr->isEof = 1;
      return sqlite3_reset(pCsr->pStmt);
    }
  }else{

    /* Page p itself has already been visited. */
................................................................................
          pCsr->nPayload = nUsable - 4;
        }else{
          pCsr->nPayload = pCell->nLastOvfl;
          pCsr->nUnused = nUsable - 4 - pCsr->nPayload;
        }
        pCell->iOvfl++;
        statSizeAndOffset(pCsr);
        return z==0 ? SQLITE_NOMEM : SQLITE_OK;
      }
      if( p->iRightChildPg ) break;
      p->iCell++;
    }

    if( !p->iRightChildPg || p->iCell>p->nCell ){
      statClearPage(p);
................................................................................
    }else{
      p[1].iPgno = p->aCell[p->iCell].iChildPg;
    }
    rc = sqlite3PagerGet(pPager, p[1].iPgno, &p[1].pPg, 0);
    p[1].iCell = 0;
    p[1].zPath = z = sqlite3_mprintf("%s%.3x/", p->zPath, p->iCell);
    p->iCell++;
    if( z==0 ) rc = SQLITE_NOMEM;
  }


  /* Populate the StatCursor fields with the values to be returned
  ** by the xColumn() and xRowid() methods.
  */
  if( rc==SQLITE_OK ){
................................................................................
          pCsr->zPagetype = "corrupted";
          break;
      }
      pCsr->nCell = p->nCell;
      pCsr->nUnused = p->nUnused;
      pCsr->nMxPayload = p->nMxPayload;
      pCsr->zPath = z = sqlite3_mprintf("%s", p->zPath);
      if( z==0 ) rc = SQLITE_NOMEM;
      nPayload = 0;
      for(i=0; i<p->nCell; i++){
        nPayload += p->aCell[i].nLocal;
      }
      pCsr->nPayload = nPayload;
    }
  }
................................................................................

  if( idxNum==1 ){
    const char *zDbase = (const char*)sqlite3_value_text(argv[0]);
    pCsr->iDb = sqlite3FindDbName(pTab->db, zDbase);
    if( pCsr->iDb<0 ){
      sqlite3_free(pCursor->pVtab->zErrMsg);
      pCursor->pVtab->zErrMsg = sqlite3_mprintf("no such schema: %s", zDbase);
      return pCursor->pVtab->zErrMsg ? SQLITE_ERROR : SQLITE_NOMEM;
    }
  }else{
    pCsr->iDb = pTab->iDb;
  }
  statResetCsr(pCsr);
  sqlite3_finalize(pCsr->pStmt);
  pCsr->pStmt = 0;
................................................................................
  zSql = sqlite3_mprintf(
      "SELECT 'sqlite_master' AS name, 1 AS rootpage, 'table' AS type"
      "  UNION ALL  "
      "SELECT name, rootpage, type"
      "  FROM \"%w\".%s WHERE rootpage!=0"
      "  ORDER BY name", pTab->db->aDb[pCsr->iDb].zName, zMaster);
  if( zSql==0 ){
    return SQLITE_NOMEM;
  }else{
    rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pCsr->pStmt, 0);
    sqlite3_free(zSql);
  }

  if( rc==SQLITE_OK ){
    rc = statNext(pCursor);

    }
  }else{
    iDb = 0;
  }
  rc = sqlite3_declare_vtab(db, VTAB_SCHEMA);
  if( rc==SQLITE_OK ){
    pTab = (StatTable *)sqlite3_malloc64(sizeof(StatTable));
    if( pTab==0 ) rc = SQLITE_NOMEM_BKPT;
  }

  assert( rc==SQLITE_OK || pTab==0 );
  if( rc==SQLITE_OK ){
    memset(pTab, 0, sizeof(StatTable));
    pTab->db = db;
    pTab->iDb = iDb;
................................................................................
*/
static int statOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
  StatTable *pTab = (StatTable *)pVTab;
  StatCursor *pCsr;

  pCsr = (StatCursor *)sqlite3_malloc64(sizeof(StatCursor));
  if( pCsr==0 ){
    return SQLITE_NOMEM_BKPT;
  }else{
    memset(pCsr, 0, sizeof(StatCursor));
    pCsr->base.pVtab = pVTab;
    pCsr->iDb = pTab->iDb;
  }

  *ppCursor = (sqlite3_vtab_cursor *)pCsr;
................................................................................
    int i;                        /* Used to iterate through cells */
    int nUsable;                  /* Usable bytes per page */

    sqlite3BtreeEnter(pBt);
    nUsable = szPage - sqlite3BtreeGetReserveNoMutex(pBt);
    sqlite3BtreeLeave(pBt);
    p->aCell = sqlite3_malloc64((p->nCell+1) * sizeof(StatCell));
    if( p->aCell==0 ) return SQLITE_NOMEM_BKPT;
    memset(p->aCell, 0, (p->nCell+1) * sizeof(StatCell));

    for(i=0; i<p->nCell; i++){
      StatCell *pCell = &p->aCell[i];

      iOff = get2byte(&aData[nHdr+i*2]);
      if( !isLeaf ){
................................................................................
        assert( nLocal<=(nUsable-35) );
        if( nPayload>(u32)nLocal ){
          int j;
          int nOvfl = ((nPayload - nLocal) + nUsable-4 - 1) / (nUsable - 4);
          pCell->nLastOvfl = (nPayload-nLocal) - (nOvfl-1) * (nUsable-4);
          pCell->nOvfl = nOvfl;
          pCell->aOvfl = sqlite3_malloc64(sizeof(u32)*nOvfl);
          if( pCell->aOvfl==0 ) return SQLITE_NOMEM_BKPT;
          pCell->aOvfl[0] = sqlite3Get4byte(&aData[iOff+nLocal]);
          for(j=1; j<nOvfl; j++){
            int rc;
            u32 iPrev = pCell->aOvfl[j-1];
            DbPage *pPg = 0;
            rc = sqlite3PagerGet(sqlite3BtreePager(pBt), iPrev, &pPg, 0);
            if( rc!=SQLITE_OK ){
................................................................................
        return sqlite3_reset(pCsr->pStmt);
      }
      rc = sqlite3PagerGet(pPager, iRoot, &pCsr->aPage[0].pPg, 0);
      pCsr->aPage[0].iPgno = iRoot;
      pCsr->aPage[0].iCell = 0;
      pCsr->aPage[0].zPath = z = sqlite3_mprintf("/");
      pCsr->iPage = 0;
      if( z==0 ) rc = SQLITE_NOMEM_BKPT;
    }else{
      pCsr->isEof = 1;
      return sqlite3_reset(pCsr->pStmt);
    }
  }else{

    /* Page p itself has already been visited. */
................................................................................
          pCsr->nPayload = nUsable - 4;
        }else{
          pCsr->nPayload = pCell->nLastOvfl;
          pCsr->nUnused = nUsable - 4 - pCsr->nPayload;
        }
        pCell->iOvfl++;
        statSizeAndOffset(pCsr);
        return z==0 ? SQLITE_NOMEM_BKPT : SQLITE_OK;
      }
      if( p->iRightChildPg ) break;
      p->iCell++;
    }

    if( !p->iRightChildPg || p->iCell>p->nCell ){
      statClearPage(p);
................................................................................
    }else{
      p[1].iPgno = p->aCell[p->iCell].iChildPg;
    }
    rc = sqlite3PagerGet(pPager, p[1].iPgno, &p[1].pPg, 0);
    p[1].iCell = 0;
    p[1].zPath = z = sqlite3_mprintf("%s%.3x/", p->zPath, p->iCell);
    p->iCell++;
    if( z==0 ) rc = SQLITE_NOMEM_BKPT;
  }


  /* Populate the StatCursor fields with the values to be returned
  ** by the xColumn() and xRowid() methods.
  */
  if( rc==SQLITE_OK ){
................................................................................
          pCsr->zPagetype = "corrupted";
          break;
      }
      pCsr->nCell = p->nCell;
      pCsr->nUnused = p->nUnused;
      pCsr->nMxPayload = p->nMxPayload;
      pCsr->zPath = z = sqlite3_mprintf("%s", p->zPath);
      if( z==0 ) rc = SQLITE_NOMEM_BKPT;
      nPayload = 0;
      for(i=0; i<p->nCell; i++){
        nPayload += p->aCell[i].nLocal;
      }
      pCsr->nPayload = nPayload;
    }
  }
................................................................................

  if( idxNum==1 ){
    const char *zDbase = (const char*)sqlite3_value_text(argv[0]);
    pCsr->iDb = sqlite3FindDbName(pTab->db, zDbase);
    if( pCsr->iDb<0 ){
      sqlite3_free(pCursor->pVtab->zErrMsg);
      pCursor->pVtab->zErrMsg = sqlite3_mprintf("no such schema: %s", zDbase);
      return pCursor->pVtab->zErrMsg ? SQLITE_ERROR : SQLITE_NOMEM_BKPT;
    }
  }else{
    pCsr->iDb = pTab->iDb;
  }
  statResetCsr(pCsr);
  sqlite3_finalize(pCsr->pStmt);
  pCsr->pStmt = 0;
................................................................................
  zSql = sqlite3_mprintf(
      "SELECT 'sqlite_master' AS name, 1 AS rootpage, 'table' AS type"
      "  UNION ALL  "
      "SELECT name, rootpage, type"
      "  FROM \"%w\".%s WHERE rootpage!=0"
      "  ORDER BY name", pTab->db->aDb[pCsr->iDb].zName, zMaster);
  if( zSql==0 ){
    return SQLITE_NOMEM_BKPT;
  }else{
    rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pCsr->pStmt, 0);
    sqlite3_free(zSql);
  }

  if( rc==SQLITE_OK ){
    rc = statNext(pCursor);

      }
      break;
    }
    case TK_FUNCTION: {
      ExprList *pFarg;       /* List of function arguments */
      int nFarg;             /* Number of function arguments */
      FuncDef *pDef;         /* The function definition object */
      int nId;               /* Length of the function name in bytes */
      const char *zId;       /* The function name */
      u32 constMask = 0;     /* Mask of function arguments that are constant */
      int i;                 /* Loop counter */
      u8 enc = ENC(db);      /* The text encoding used by this database */
      CollSeq *pColl = 0;    /* A collating sequence */

      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
................................................................................
        pFarg = 0;
      }else{
        pFarg = pExpr->x.pList;
      }
      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(db, zId, nId, nFarg, enc, 0);
      if( pDef==0 || pDef->xFinalize!=0 ){
        sqlite3ErrorMsg(pParse, "unknown function: %.*s()", nId, zId);
        break;
      }

      /* Attempt a direct implementation of the built-in COALESCE() and
      ** IFNULL() functions.  This avoids unnecessary evaluation of
      ** arguments past the first non-NULL argument.
      */
................................................................................
          if( i>=0 ){
            assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
            pItem = &pAggInfo->aFunc[i];
            pItem->pExpr = pExpr;
            pItem->iMem = ++pParse->nMem;
            assert( !ExprHasProperty(pExpr, EP_IntValue) );
            pItem->pFunc = sqlite3FindFunction(pParse->db,
                   pExpr->u.zToken, sqlite3Strlen30(pExpr->u.zToken),
                   pExpr->x.pList ? pExpr->x.pList->nExpr : 0, enc, 0);
            if( pExpr->flags & EP_Distinct ){
              pItem->iDistinct = pParse->nTab++;
            }else{
              pItem->iDistinct = -1;
            }
          }

      }
      break;
    }
    case TK_FUNCTION: {
      ExprList *pFarg;       /* List of function arguments */
      int nFarg;             /* Number of function arguments */
      FuncDef *pDef;         /* The function definition object */

      const char *zId;       /* The function name */
      u32 constMask = 0;     /* Mask of function arguments that are constant */
      int i;                 /* Loop counter */
      u8 enc = ENC(db);      /* The text encoding used by this database */
      CollSeq *pColl = 0;    /* A collating sequence */

      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
................................................................................
        pFarg = 0;
      }else{
        pFarg = pExpr->x.pList;
      }
      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;

      pDef = sqlite3FindFunction(db, zId, nFarg, enc, 0);
      if( pDef==0 || pDef->xFinalize!=0 ){
        sqlite3ErrorMsg(pParse, "unknown function: %s()", zId);
        break;
      }

      /* Attempt a direct implementation of the built-in COALESCE() and
      ** IFNULL() functions.  This avoids unnecessary evaluation of
      ** arguments past the first non-NULL argument.
      */
................................................................................
          if( i>=0 ){
            assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
            pItem = &pAggInfo->aFunc[i];
            pItem->pExpr = pExpr;
            pItem->iMem = ++pParse->nMem;
            assert( !ExprHasProperty(pExpr, EP_IntValue) );
            pItem->pFunc = sqlite3FindFunction(pParse->db,
                   pExpr->u.zToken, 
                   pExpr->x.pList ? pExpr->x.pList->nExpr : 0, enc, 0);
            if( pExpr->flags & EP_Distinct ){
              pItem->iDistinct = pParse->nTab++;
            }else{
              pItem->iDistinct = -1;
            }
          }

}

/*
** This routine does per-connection function registration.  Most
** of the built-in functions above are part of the global function set.
** This routine only deals with those that are not global.
*/
void sqlite3RegisterBuiltinFunctions(sqlite3 *db){
  int rc = sqlite3_overload_function(db, "MATCH", 2);
  assert( rc==SQLITE_NOMEM || rc==SQLITE_OK );
  if( rc==SQLITE_NOMEM ){
    sqlite3OomFault(db);
  }
}

/*
** Set the LIKEOPT flag on the 2-argument function with the given name.
*/
static void setLikeOptFlag(sqlite3 *db, const char *zName, u8 flagVal){
  FuncDef *pDef;
  pDef = sqlite3FindFunction(db, zName, sqlite3Strlen30(zName),
                             2, SQLITE_UTF8, 0);
  if( ALWAYS(pDef) ){
    pDef->funcFlags |= flagVal;
  }
}

/*
** Register the built-in LIKE and GLOB functions.  The caseSensitive
................................................................................
  if( pExpr->op!=TK_FUNCTION 
   || !pExpr->x.pList 
   || pExpr->x.pList->nExpr!=2
  ){
    return 0;
  }
  assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
  pDef = sqlite3FindFunction(db, pExpr->u.zToken, 
                             sqlite3Strlen30(pExpr->u.zToken),
                             2, SQLITE_UTF8, 0);
  if( NEVER(pDef==0) || (pDef->funcFlags & SQLITE_FUNC_LIKE)==0 ){
    return 0;
  }

  /* The memcpy() statement assumes that the wildcard characters are
  ** the first three statements in the compareInfo structure.  The
  ** asserts() that follow verify that assumption
................................................................................
/*
** All of the FuncDef structures in the aBuiltinFunc[] array above
** to the global function hash table.  This occurs at start-time (as
** a consequence of calling sqlite3_initialize()).
**
** After this routine runs
*/
void sqlite3RegisterGlobalFunctions(void){
  /*
  ** The following array holds FuncDef structures for all of the functions
  ** defined in this file.
  **
  ** The array cannot be constant since changes are made to the
  ** FuncDef.pHash elements at start-time.  The elements of this array
  ** are read-only after initialization is complete.


  */
  static SQLITE_WSD FuncDef aBuiltinFunc[] = {

















    FUNCTION(ltrim,              1, 1, 0, trimFunc         ),
    FUNCTION(ltrim,              2, 1, 0, trimFunc         ),
    FUNCTION(rtrim,              1, 2, 0, trimFunc         ),
    FUNCTION(rtrim,              2, 2, 0, trimFunc         ),
    FUNCTION(trim,               1, 3, 0, trimFunc         ),
    FUNCTION(trim,               2, 3, 0, trimFunc         ),
    FUNCTION(min,               -1, 0, 1, minmaxFunc       ),
................................................................................
    FUNCTION(max,               -1, 1, 1, minmaxFunc       ),
    FUNCTION(max,                0, 1, 1, 0                ),
    AGGREGATE2(max,              1, 1, 1, minmaxStep,      minMaxFinalize,
                                          SQLITE_FUNC_MINMAX ),
    FUNCTION2(typeof,            1, 0, 0, typeofFunc,  SQLITE_FUNC_TYPEOF),
    FUNCTION2(length,            1, 0, 0, lengthFunc,  SQLITE_FUNC_LENGTH),
    FUNCTION(instr,              2, 0, 0, instrFunc        ),
    FUNCTION(substr,             2, 0, 0, substrFunc       ),
    FUNCTION(substr,             3, 0, 0, substrFunc       ),
    FUNCTION(printf,            -1, 0, 0, printfFunc       ),
    FUNCTION(unicode,            1, 0, 0, unicodeFunc      ),
    FUNCTION(char,              -1, 0, 0, charFunc         ),
    FUNCTION(abs,                1, 0, 0, absFunc          ),
#ifndef SQLITE_OMIT_FLOATING_POINT
    FUNCTION(round,              1, 0, 0, roundFunc        ),
    FUNCTION(round,              2, 0, 0, roundFunc        ),
#endif
    FUNCTION(upper,              1, 0, 0, upperFunc        ),
    FUNCTION(lower,              1, 0, 0, lowerFunc        ),
    FUNCTION(coalesce,           1, 0, 0, 0                ),
    FUNCTION(coalesce,           0, 0, 0, 0                ),
    FUNCTION2(coalesce,         -1, 0, 0, noopFunc,  SQLITE_FUNC_COALESCE),
    FUNCTION(hex,                1, 0, 0, hexFunc          ),
    FUNCTION2(ifnull,            2, 0, 0, noopFunc,  SQLITE_FUNC_COALESCE),
    FUNCTION2(unlikely,          1, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    FUNCTION2(likelihood,        2, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    FUNCTION2(likely,            1, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    VFUNCTION(random,            0, 0, 0, randomFunc       ),
    VFUNCTION(randomblob,        1, 0, 0, randomBlob       ),
    FUNCTION(nullif,             2, 0, 1, nullifFunc       ),
    DFUNCTION(sqlite_version,    0, 0, 0, versionFunc      ),
    DFUNCTION(sqlite_source_id,  0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
#if SQLITE_USER_AUTHENTICATION
    FUNCTION(sqlite_crypt,       2, 0, 0, sqlite3CryptFunc ),
#endif
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
    DFUNCTION(sqlite_compileoption_used,1, 0, 0, compileoptionusedFunc  ),
    DFUNCTION(sqlite_compileoption_get, 1, 0, 0, compileoptiongetFunc  ),
#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
    FUNCTION(quote,              1, 0, 0, quoteFunc        ),
    VFUNCTION(last_insert_rowid, 0, 0, 0, last_insert_rowid),
    VFUNCTION(changes,           0, 0, 0, changes          ),
    VFUNCTION(total_changes,     0, 0, 0, total_changes    ),
    FUNCTION(replace,            3, 0, 0, replaceFunc      ),
    FUNCTION(zeroblob,           1, 0, 0, zeroblobFunc     ),
  #ifdef SQLITE_SOUNDEX
    FUNCTION(soundex,            1, 0, 0, soundexFunc      ),
  #endif
  #ifndef SQLITE_OMIT_LOAD_EXTENSION
    VFUNCTION(load_extension,    1, 0, 0, loadExt          ),
    VFUNCTION(load_extension,    2, 0, 0, loadExt          ),
  #endif
    AGGREGATE(sum,               1, 0, 0, sumStep,         sumFinalize    ),
    AGGREGATE(total,             1, 0, 0, sumStep,         totalFinalize    ),
    AGGREGATE(avg,               1, 0, 0, sumStep,         avgFinalize    ),
    AGGREGATE2(count,            0, 0, 0, countStep,       countFinalize,
               SQLITE_FUNC_COUNT  ),
    AGGREGATE(count,             1, 0, 0, countStep,       countFinalize  ),
    AGGREGATE(group_concat,      1, 0, 0, groupConcatStep, groupConcatFinalize),
................................................................................
  #ifdef SQLITE_CASE_SENSITIVE_LIKE
    LIKEFUNC(like, 2, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
    LIKEFUNC(like, 3, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
  #else
    LIKEFUNC(like, 2, &likeInfoNorm, SQLITE_FUNC_LIKE),
    LIKEFUNC(like, 3, &likeInfoNorm, SQLITE_FUNC_LIKE),
  #endif
  };



  int i;
  FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
  FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aBuiltinFunc);

  for(i=0; i<ArraySize(aBuiltinFunc); i++){
    sqlite3FuncDefInsert(pHash, &aFunc[i]);
  }
  sqlite3RegisterDateTimeFunctions();
#ifndef SQLITE_OMIT_ALTERTABLE
  sqlite3AlterFunctions();
#endif
#if defined(SQLITE_ENABLE_STAT3) || defined(SQLITE_ENABLE_STAT4)
  sqlite3AnalyzeFunctions();
#endif


}

}

/*
** This routine does per-connection function registration.  Most
** of the built-in functions above are part of the global function set.
** This routine only deals with those that are not global.
*/
void sqlite3RegisterPerConnectionBuiltinFunctions(sqlite3 *db){
  int rc = sqlite3_overload_function(db, "MATCH", 2);
  assert( rc==SQLITE_NOMEM || rc==SQLITE_OK );
  if( rc==SQLITE_NOMEM ){
    sqlite3OomFault(db);
  }
}

/*
** Set the LIKEOPT flag on the 2-argument function with the given name.
*/
static void setLikeOptFlag(sqlite3 *db, const char *zName, u8 flagVal){
  FuncDef *pDef;
  pDef = sqlite3FindFunction(db, zName, 2, SQLITE_UTF8, 0);

  if( ALWAYS(pDef) ){
    pDef->funcFlags |= flagVal;
  }
}

/*
** Register the built-in LIKE and GLOB functions.  The caseSensitive
................................................................................
  if( pExpr->op!=TK_FUNCTION 
   || !pExpr->x.pList 
   || pExpr->x.pList->nExpr!=2
  ){
    return 0;
  }
  assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
  pDef = sqlite3FindFunction(db, pExpr->u.zToken, 2, SQLITE_UTF8, 0);


  if( NEVER(pDef==0) || (pDef->funcFlags & SQLITE_FUNC_LIKE)==0 ){
    return 0;
  }

  /* The memcpy() statement assumes that the wildcard characters are
  ** the first three statements in the compareInfo structure.  The
  ** asserts() that follow verify that assumption
................................................................................
/*
** All of the FuncDef structures in the aBuiltinFunc[] array above
** to the global function hash table.  This occurs at start-time (as
** a consequence of calling sqlite3_initialize()).
**
** After this routine runs
*/
void sqlite3RegisterBuiltinFunctions(void){
  /*
  ** The following array holds FuncDef structures for all of the functions
  ** defined in this file.
  **
  ** The array cannot be constant since changes are made to the
  ** FuncDef.pHash elements at start-time.  The elements of this array
  ** are read-only after initialization is complete.
  **
  ** For peak efficiency, put the most frequently used function last.
  */
  static FuncDef aBuiltinFunc[] = {
#ifdef SQLITE_SOUNDEX
    FUNCTION(soundex,            1, 0, 0, soundexFunc      ),
#endif
#ifndef SQLITE_OMIT_LOAD_EXTENSION
    VFUNCTION(load_extension,    1, 0, 0, loadExt          ),
    VFUNCTION(load_extension,    2, 0, 0, loadExt          ),
#endif
#if SQLITE_USER_AUTHENTICATION
    FUNCTION(sqlite_crypt,       2, 0, 0, sqlite3CryptFunc ),
#endif
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
    DFUNCTION(sqlite_compileoption_used,1, 0, 0, compileoptionusedFunc  ),
    DFUNCTION(sqlite_compileoption_get, 1, 0, 0, compileoptiongetFunc  ),
#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
    FUNCTION2(unlikely,          1, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    FUNCTION2(likelihood,        2, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    FUNCTION2(likely,            1, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    FUNCTION(ltrim,              1, 1, 0, trimFunc         ),
    FUNCTION(ltrim,              2, 1, 0, trimFunc         ),
    FUNCTION(rtrim,              1, 2, 0, trimFunc         ),
    FUNCTION(rtrim,              2, 2, 0, trimFunc         ),
    FUNCTION(trim,               1, 3, 0, trimFunc         ),
    FUNCTION(trim,               2, 3, 0, trimFunc         ),
    FUNCTION(min,               -1, 0, 1, minmaxFunc       ),
................................................................................
    FUNCTION(max,               -1, 1, 1, minmaxFunc       ),
    FUNCTION(max,                0, 1, 1, 0                ),
    AGGREGATE2(max,              1, 1, 1, minmaxStep,      minMaxFinalize,
                                          SQLITE_FUNC_MINMAX ),
    FUNCTION2(typeof,            1, 0, 0, typeofFunc,  SQLITE_FUNC_TYPEOF),
    FUNCTION2(length,            1, 0, 0, lengthFunc,  SQLITE_FUNC_LENGTH),
    FUNCTION(instr,              2, 0, 0, instrFunc        ),


    FUNCTION(printf,            -1, 0, 0, printfFunc       ),
    FUNCTION(unicode,            1, 0, 0, unicodeFunc      ),
    FUNCTION(char,              -1, 0, 0, charFunc         ),
    FUNCTION(abs,                1, 0, 0, absFunc          ),
#ifndef SQLITE_OMIT_FLOATING_POINT
    FUNCTION(round,              1, 0, 0, roundFunc        ),
    FUNCTION(round,              2, 0, 0, roundFunc        ),
#endif
    FUNCTION(upper,              1, 0, 0, upperFunc        ),
    FUNCTION(lower,              1, 0, 0, lowerFunc        ),



    FUNCTION(hex,                1, 0, 0, hexFunc          ),
    FUNCTION2(ifnull,            2, 0, 0, noopFunc,  SQLITE_FUNC_COALESCE),



    VFUNCTION(random,            0, 0, 0, randomFunc       ),
    VFUNCTION(randomblob,        1, 0, 0, randomBlob       ),
    FUNCTION(nullif,             2, 0, 1, nullifFunc       ),
    DFUNCTION(sqlite_version,    0, 0, 0, versionFunc      ),
    DFUNCTION(sqlite_source_id,  0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),







    FUNCTION(quote,              1, 0, 0, quoteFunc        ),
    VFUNCTION(last_insert_rowid, 0, 0, 0, last_insert_rowid),
    VFUNCTION(changes,           0, 0, 0, changes          ),
    VFUNCTION(total_changes,     0, 0, 0, total_changes    ),
    FUNCTION(replace,            3, 0, 0, replaceFunc      ),
    FUNCTION(zeroblob,           1, 0, 0, zeroblobFunc     ),
    FUNCTION(substr,             2, 0, 0, substrFunc       ),
    FUNCTION(substr,             3, 0, 0, substrFunc       ),





    AGGREGATE(sum,               1, 0, 0, sumStep,         sumFinalize    ),
    AGGREGATE(total,             1, 0, 0, sumStep,         totalFinalize    ),
    AGGREGATE(avg,               1, 0, 0, sumStep,         avgFinalize    ),
    AGGREGATE2(count,            0, 0, 0, countStep,       countFinalize,
               SQLITE_FUNC_COUNT  ),
    AGGREGATE(count,             1, 0, 0, countStep,       countFinalize  ),
    AGGREGATE(group_concat,      1, 0, 0, groupConcatStep, groupConcatFinalize),
................................................................................
  #ifdef SQLITE_CASE_SENSITIVE_LIKE
    LIKEFUNC(like, 2, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
    LIKEFUNC(like, 3, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
  #else
    LIKEFUNC(like, 2, &likeInfoNorm, SQLITE_FUNC_LIKE),
    LIKEFUNC(like, 3, &likeInfoNorm, SQLITE_FUNC_LIKE),
  #endif


    FUNCTION(coalesce,           1, 0, 0, 0                ),
    FUNCTION(coalesce,           0, 0, 0, 0                ),
    FUNCTION2(coalesce,         -1, 0, 0, noopFunc,  SQLITE_FUNC_COALESCE),





  };

#ifndef SQLITE_OMIT_ALTERTABLE
  sqlite3AlterFunctions();
#endif
#if defined(SQLITE_ENABLE_STAT3) || defined(SQLITE_ENABLE_STAT4)
  sqlite3AnalyzeFunctions();
#endif
  sqlite3RegisterDateTimeFunctions();
  sqlite3InsertBuiltinFuncs(aBuiltinFunc, ArraySize(aBuiltinFunc));

#if 0  /* Enable to print out how the built-in functions are hashed */
  {
    int i;
    FuncDef *p;
    for(i=0; i<SQLITE_FUNC_HASH_SZ; i++){
      printf("FUNC-HASH %02d:", i);
      for(p=sqlite3BuiltinFunctions.a[i]; p; p=p->u.pHash){
        int n = sqlite3Strlen30(p->zName);
        int h = p->zName[0] + n;
        printf(" %s(%d)", p->zName, h);
      }
      printf("\n");
    }
  }
#endif
}

};

/*
** Hash table for global functions - functions common to all
** database connections.  After initialization, this table is
** read-only.
*/
SQLITE_WSD FuncDefHash sqlite3GlobalFunctions;

/*
** Constant tokens for values 0 and 1.
*/
const Token sqlite3IntTokens[] = {
   { "0", 1 },
   { "1", 1 }

};

/*
** Hash table for global functions - functions common to all
** database connections.  After initialization, this table is
** read-only.
*/
FuncDefHash sqlite3BuiltinFunctions;

/*
** Constant tokens for values 0 and 1.
*/
const Token sqlite3IntTokens[] = {
   { "0", 1 },
   { "1", 1 }

  int nBuf                   /* Bytes buffered before opening the file */
){
  JournalFile *p = (JournalFile *)pJfd;
  memset(p, 0, sqlite3JournalSize(pVfs));
  if( nBuf>0 ){
    p->zBuf = sqlite3MallocZero(nBuf);
    if( !p->zBuf ){
      return SQLITE_NOMEM;
    }
  }else{
    return sqlite3OsOpen(pVfs, zName, pJfd, flags, 0);
  }
  p->pMethod = &JournalFileMethods;
  p->nBuf = nBuf;
  p->flags = flags;

  int nBuf                   /* Bytes buffered before opening the file */
){
  JournalFile *p = (JournalFile *)pJfd;
  memset(p, 0, sqlite3JournalSize(pVfs));
  if( nBuf>0 ){
    p->zBuf = sqlite3MallocZero(nBuf);
    if( !p->zBuf ){
      return SQLITE_NOMEM_BKPT;
    }
  }else{
    return sqlite3OsOpen(pVfs, zName, pJfd, flags, 0);
  }
  p->pMethod = &JournalFileMethods;
  p->nBuf = nBuf;
  p->flags = flags;

  rc = sqlite3ApiExit(db, rc);
  if( rc!=SQLITE_OK && pzErrMsg ){
    int nErrMsg = 1 + sqlite3Strlen30(sqlite3_errmsg(db));
    *pzErrMsg = sqlite3Malloc(nErrMsg);
    if( *pzErrMsg ){
      memcpy(*pzErrMsg, sqlite3_errmsg(db), nErrMsg);
    }else{
      rc = SQLITE_NOMEM;
      sqlite3Error(db, SQLITE_NOMEM);
    }
  }else if( pzErrMsg ){
    *pzErrMsg = 0;
  }

  assert( (rc&db->errMask)==rc );
  sqlite3_mutex_leave(db->mutex);
  return rc;
}

  rc = sqlite3ApiExit(db, rc);
  if( rc!=SQLITE_OK && pzErrMsg ){
    int nErrMsg = 1 + sqlite3Strlen30(sqlite3_errmsg(db));
    *pzErrMsg = sqlite3Malloc(nErrMsg);
    if( *pzErrMsg ){
      memcpy(*pzErrMsg, sqlite3_errmsg(db), nErrMsg);
    }else{
      rc = SQLITE_NOMEM_BKPT;
      sqlite3Error(db, SQLITE_NOMEM);
    }
  }else if( pzErrMsg ){
    *pzErrMsg = 0;
  }

  assert( (rc&db->errMask)==rc );
  sqlite3_mutex_leave(db->mutex);
  return rc;
}

  zEntry = zProc ? zProc : "sqlite3_extension_init";

  handle = sqlite3OsDlOpen(pVfs, zFile);
#if SQLITE_OS_UNIX || SQLITE_OS_WIN
  for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){
    char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]);
    if( zAltFile==0 ) return SQLITE_NOMEM;
    handle = sqlite3OsDlOpen(pVfs, zAltFile);
    sqlite3_free(zAltFile);
  }
#endif
  if( handle==0 ){
    if( pzErrMsg ){
      *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);
................................................................................
  */
  if( xInit==0 && zProc==0 ){
    int iFile, iEntry, c;
    int ncFile = sqlite3Strlen30(zFile);
    zAltEntry = sqlite3_malloc64(ncFile+30);
    if( zAltEntry==0 ){
      sqlite3OsDlClose(pVfs, handle);
      return SQLITE_NOMEM;
    }
    memcpy(zAltEntry, "sqlite3_", 8);
    for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){}
    iFile++;
    if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3;
    for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){
      if( sqlite3Isalpha(c) ){
................................................................................
    sqlite3OsDlClose(pVfs, handle);
    return SQLITE_ERROR;
  }

  /* Append the new shared library handle to the db->aExtension array. */
  aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1));
  if( aHandle==0 ){
    return SQLITE_NOMEM;
  }
  if( db->nExtension>0 ){
    memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension);
  }
  sqlite3DbFree(db, db->aExtension);
  db->aExtension = aHandle;

................................................................................
      if( wsdAutoext.aExt[i]==xInit ) break;
    }
    if( i==wsdAutoext.nExt ){
      u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]);
      void (**aNew)(void);
      aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte);
      if( aNew==0 ){
        rc = SQLITE_NOMEM;
      }else{
        wsdAutoext.aExt = aNew;
        wsdAutoext.aExt[wsdAutoext.nExt] = xInit;
        wsdAutoext.nExt++;
      }
    }
    sqlite3_mutex_leave(mutex);

  zEntry = zProc ? zProc : "sqlite3_extension_init";

  handle = sqlite3OsDlOpen(pVfs, zFile);
#if SQLITE_OS_UNIX || SQLITE_OS_WIN
  for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){
    char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]);
    if( zAltFile==0 ) return SQLITE_NOMEM_BKPT;
    handle = sqlite3OsDlOpen(pVfs, zAltFile);
    sqlite3_free(zAltFile);
  }
#endif
  if( handle==0 ){
    if( pzErrMsg ){
      *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);
................................................................................
  */
  if( xInit==0 && zProc==0 ){
    int iFile, iEntry, c;
    int ncFile = sqlite3Strlen30(zFile);
    zAltEntry = sqlite3_malloc64(ncFile+30);
    if( zAltEntry==0 ){
      sqlite3OsDlClose(pVfs, handle);
      return SQLITE_NOMEM_BKPT;
    }
    memcpy(zAltEntry, "sqlite3_", 8);
    for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){}
    iFile++;
    if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3;
    for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){
      if( sqlite3Isalpha(c) ){
................................................................................
    sqlite3OsDlClose(pVfs, handle);
    return SQLITE_ERROR;
  }

  /* Append the new shared library handle to the db->aExtension array. */
  aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1));
  if( aHandle==0 ){
    return SQLITE_NOMEM_BKPT;
  }
  if( db->nExtension>0 ){
    memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension);
  }
  sqlite3DbFree(db, db->aExtension);
  db->aExtension = aHandle;

................................................................................
      if( wsdAutoext.aExt[i]==xInit ) break;
    }
    if( i==wsdAutoext.nExt ){
      u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]);
      void (**aNew)(void);
      aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte);
      if( aNew==0 ){
        rc = SQLITE_NOMEM_BKPT;
      }else{
        wsdAutoext.aExt = aNew;
        wsdAutoext.aExt[wsdAutoext.nExt] = xInit;
        wsdAutoext.nExt++;
      }
    }
    sqlite3_mutex_leave(mutex);

  }
  if( rc==SQLITE_OK ){
    sqlite3GlobalConfig.isMallocInit = 1;
    if( !sqlite3GlobalConfig.pInitMutex ){
      sqlite3GlobalConfig.pInitMutex =
           sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
      if( sqlite3GlobalConfig.bCoreMutex && !sqlite3GlobalConfig.pInitMutex ){
        rc = SQLITE_NOMEM;
      }
    }
  }
  if( rc==SQLITE_OK ){
    sqlite3GlobalConfig.nRefInitMutex++;
  }
  sqlite3_mutex_leave(pMaster);
................................................................................
  **
  ** The following mutex is what serializes access to the appdef pcache xInit
  ** methods.  The sqlite3_pcache_methods.xInit() all is embedded in the
  ** call to sqlite3PcacheInitialize().
  */
  sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex);
  if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){
    FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
    sqlite3GlobalConfig.inProgress = 1;
#ifdef SQLITE_ENABLE_SQLLOG
    {
      extern void sqlite3_init_sqllog(void);
      sqlite3_init_sqllog();
    }
#endif
    memset(pHash, 0, sizeof(sqlite3GlobalFunctions));
    sqlite3RegisterGlobalFunctions();
    if( sqlite3GlobalConfig.isPCacheInit==0 ){
      rc = sqlite3PcacheInitialize();
    }
    if( rc==SQLITE_OK ){
      sqlite3GlobalConfig.isPCacheInit = 1;
      rc = sqlite3OsInit();
    }
................................................................................
/*
** Invoke the destructor function associated with FuncDef p, if any. Except,
** if this is not the last copy of the function, do not invoke it. Multiple
** copies of a single function are created when create_function() is called
** with SQLITE_ANY as the encoding.
*/
static void functionDestroy(sqlite3 *db, FuncDef *p){
  FuncDestructor *pDestructor = p->pDestructor;
  if( pDestructor ){
    pDestructor->nRef--;
    if( pDestructor->nRef==0 ){
      pDestructor->xDestroy(pDestructor->pUserData);
      sqlite3DbFree(db, pDestructor);
    }
  }
................................................................................
  assert( db->aDb==db->aDbStatic );

  /* Tell the code in notify.c that the connection no longer holds any
  ** locks and does not require any further unlock-notify callbacks.
  */
  sqlite3ConnectionClosed(db);

  for(j=0; j<ArraySize(db->aFunc.a); j++){
    FuncDef *pNext, *pHash, *p;
    for(p=db->aFunc.a[j]; p; p=pHash){
      pHash = p->pHash;
      while( p ){

        functionDestroy(db, p);
        pNext = p->pNext;
        sqlite3DbFree(db, p);
        p = pNext;

      }
    }
  }

  for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){
    CollSeq *pColl = (CollSeq *)sqliteHashData(i);
    /* Invoke any destructors registered for collation sequence user data. */
    for(j=0; j<3; j++){
      if( pColl[j].xDel ){
        pColl[j].xDel(pColl[j].pUser);
      }
................................................................................
#endif
  
  /* Check if an existing function is being overridden or deleted. If so,
  ** and there are active VMs, then return SQLITE_BUSY. If a function
  ** is being overridden/deleted but there are no active VMs, allow the
  ** operation to continue but invalidate all precompiled statements.
  */
  p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 0);
  if( p && (p->funcFlags & SQLITE_FUNC_ENCMASK)==enc && p->nArg==nArg ){
    if( db->nVdbeActive ){
      sqlite3ErrorWithMsg(db, SQLITE_BUSY, 
        "unable to delete/modify user-function due to active statements");
      assert( !db->mallocFailed );
      return SQLITE_BUSY;
    }else{
      sqlite3ExpirePreparedStatements(db);
    }
  }

  p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 1);
  assert(p || db->mallocFailed);
  if( !p ){
    return SQLITE_NOMEM;
  }

  /* If an older version of the function with a configured destructor is
  ** being replaced invoke the destructor function here. */
  functionDestroy(db, p);

  if( pDestructor ){
    pDestructor->nRef++;
  }
  p->pDestructor = pDestructor;
  p->funcFlags = (p->funcFlags & SQLITE_FUNC_ENCMASK) | extraFlags;
  testcase( p->funcFlags & SQLITE_DETERMINISTIC );
  p->xSFunc = xSFunc ? xSFunc : xStep;
  p->xFinalize = xFinal;
  p->pUserData = pUserData;
  p->nArg = (u16)nArg;
  return SQLITE_OK;
................................................................................
** properly.
*/
int sqlite3_overload_function(
  sqlite3 *db,
  const char *zName,
  int nArg
){
  int nName = sqlite3Strlen30(zName);
  int rc = SQLITE_OK;

#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) || zName==0 || nArg<-2 ){
    return SQLITE_MISUSE_BKPT;
  }
#endif
  sqlite3_mutex_enter(db->mutex);
  if( sqlite3FindFunction(db, zName, nName, nArg, SQLITE_UTF8, 0)==0 ){
    rc = sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
                           0, sqlite3InvalidFunction, 0, 0, 0);
  }
  rc = sqlite3ApiExit(db, rc);
  sqlite3_mutex_leave(db->mutex);
  return rc;
}
................................................................................
/*
** Return UTF-8 encoded English language explanation of the most recent
** error.
*/
const char *sqlite3_errmsg(sqlite3 *db){
  const char *z;
  if( !db ){
    return sqlite3ErrStr(SQLITE_NOMEM);
  }
  if( !sqlite3SafetyCheckSickOrOk(db) ){
    return sqlite3ErrStr(SQLITE_MISUSE_BKPT);
  }
  sqlite3_mutex_enter(db->mutex);
  if( db->mallocFailed ){
    z = sqlite3ErrStr(SQLITE_NOMEM);
  }else{
    testcase( db->pErr==0 );
    z = (char*)sqlite3_value_text(db->pErr);
    assert( !db->mallocFailed );
    if( z==0 ){
      z = sqlite3ErrStr(db->errCode);
    }
................................................................................
** passed to this function, we assume a malloc() failed during sqlite3_open().
*/
int sqlite3_errcode(sqlite3 *db){
  if( db && !sqlite3SafetyCheckSickOrOk(db) ){
    return SQLITE_MISUSE_BKPT;
  }
  if( !db || db->mallocFailed ){
    return SQLITE_NOMEM;
  }
  return db->errCode & db->errMask;
}
int sqlite3_extended_errcode(sqlite3 *db){
  if( db && !sqlite3SafetyCheckSickOrOk(db) ){
    return SQLITE_MISUSE_BKPT;
  }
  if( !db || db->mallocFailed ){
    return SQLITE_NOMEM;
  }
  return db->errCode;
}

/*
** Return a string that describes the kind of error specified in the
** argument.  For now, this simply calls the internal sqlite3ErrStr()
................................................................................
          p->xCmp = 0;
        }
      }
    }
  }

  pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 1);
  if( pColl==0 ) return SQLITE_NOMEM;
  pColl->xCmp = xCompare;
  pColl->pUser = pCtx;
  pColl->xDel = xDel;
  pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED));
  sqlite3Error(db, SQLITE_OK);
  return SQLITE_OK;
}
................................................................................
#endif
#if SQLITE_MAX_COMPOUND_SELECT<2
# error SQLITE_MAX_COMPOUND_SELECT must be at least 2
#endif
#if SQLITE_MAX_VDBE_OP<40
# error SQLITE_MAX_VDBE_OP must be at least 40
#endif
#if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>1000
# error SQLITE_MAX_FUNCTION_ARG must be between 0 and 1000
#endif
#if SQLITE_MAX_ATTACHED<0 || SQLITE_MAX_ATTACHED>125
# error SQLITE_MAX_ATTACHED must be between 0 and 125
#endif
#if SQLITE_MAX_LIKE_PATTERN_LENGTH<1
# error SQLITE_MAX_LIKE_PATTERN_LENGTH must be at least 1
#endif
................................................................................

    /* Make sure the SQLITE_OPEN_URI flag is set to indicate to the VFS xOpen 
    ** method that there may be extra parameters following the file-name.  */
    flags |= SQLITE_OPEN_URI;

    for(iIn=0; iIn<nUri; iIn++) nByte += (zUri[iIn]=='&');
    zFile = sqlite3_malloc64(nByte);
    if( !zFile ) return SQLITE_NOMEM;

    iIn = 5;
#ifdef SQLITE_ALLOW_URI_AUTHORITY
    if( strncmp(zUri+5, "///", 3)==0 ){
      iIn = 7;
      /* The following condition causes URIs with five leading / characters
      ** like file://///host/path to be converted into UNCs like //host/path.
................................................................................
      }

      zOpt = &zVal[nVal+1];
    }

  }else{
    zFile = sqlite3_malloc64(nUri+2);
    if( !zFile ) return SQLITE_NOMEM;
    memcpy(zFile, zUri, nUri);
    zFile[nUri] = '\0';
    zFile[nUri+1] = '\0';
    flags &= ~SQLITE_OPEN_URI;
  }

  *ppVfs = sqlite3_vfs_find(zVfs);
................................................................................
  }

  /* Open the backend database driver */
  rc = sqlite3BtreeOpen(db->pVfs, zOpen, db, &db->aDb[0].pBt, 0,
                        flags | SQLITE_OPEN_MAIN_DB);
  if( rc!=SQLITE_OK ){
    if( rc==SQLITE_IOERR_NOMEM ){
      rc = SQLITE_NOMEM;
    }
    sqlite3Error(db, rc);
    goto opendb_out;
  }
  sqlite3BtreeEnter(db->aDb[0].pBt);
  db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
  if( !db->mallocFailed ) ENC(db) = SCHEMA_ENC(db);
  sqlite3BtreeLeave(db->aDb[0].pBt);
  db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);

  /* The default safety_level for the main database is 'full'; for the temp
  ** database it is 'NONE'. This matches the pager layer defaults.  
  */
  db->aDb[0].zName = "main";
  db->aDb[0].safety_level = 3;
  db->aDb[1].zName = "temp";
  db->aDb[1].safety_level = 1;

  db->magic = SQLITE_MAGIC_OPEN;
  if( db->mallocFailed ){
    goto opendb_out;
  }

  /* Register all built-in functions, but do not attempt to read the
  ** database schema yet. This is delayed until the first time the database
  ** is accessed.
  */
  sqlite3Error(db, SQLITE_OK);
  sqlite3RegisterBuiltinFunctions(db);

  /* Load automatic extensions - extensions that have been registered
  ** using the sqlite3_automatic_extension() API.
  */
  rc = sqlite3_errcode(db);
  if( rc==SQLITE_OK ){
    sqlite3AutoLoadExtensions(db);
................................................................................
    rc = openDatabase(zFilename8, ppDb,
                      SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
    assert( *ppDb || rc==SQLITE_NOMEM );
    if( rc==SQLITE_OK && !DbHasProperty(*ppDb, 0, DB_SchemaLoaded) ){
      SCHEMA_ENC(*ppDb) = ENC(*ppDb) = SQLITE_UTF16NATIVE;
    }
  }else{
    rc = SQLITE_NOMEM;
  }
  sqlite3ValueFree(pVal);

  return rc & 0xff;
}
#endif /* SQLITE_OMIT_UTF16 */

................................................................................
  }
#endif
  return db->autoCommit;
}

/*
** The following routines are substitutes for constants SQLITE_CORRUPT,
** SQLITE_MISUSE, SQLITE_CANTOPEN, SQLITE_IOERR and possibly other error
** constants.  They serve two purposes:
**
**   1.  Serve as a convenient place to set a breakpoint in a debugger
**       to detect when version error conditions occurs.
**
**   2.  Invoke sqlite3_log() to provide the source code location where
**       a low-level error is first detected.
*/
int sqlite3CorruptError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  sqlite3_log(SQLITE_CORRUPT,
              "database corruption at line %d of [%.10s]",
              lineno, 20+sqlite3_sourceid());
  return SQLITE_CORRUPT;


}
int sqlite3MisuseError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  sqlite3_log(SQLITE_MISUSE, 
              "misuse at line %d of [%.10s]",
              lineno, 20+sqlite3_sourceid());
  return SQLITE_MISUSE;
}
int sqlite3CantopenError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  sqlite3_log(SQLITE_CANTOPEN, 
              "cannot open file at line %d of [%.10s]",
              lineno, 20+sqlite3_sourceid());

  return SQLITE_CANTOPEN;



}






#ifndef SQLITE_OMIT_DEPRECATED
/*
** This is a convenience routine that makes sure that all thread-specific
** data for this thread has been deallocated.
**
** SQLite no longer uses thread-specific data so this routine is now a

  }
  if( rc==SQLITE_OK ){
    sqlite3GlobalConfig.isMallocInit = 1;
    if( !sqlite3GlobalConfig.pInitMutex ){
      sqlite3GlobalConfig.pInitMutex =
           sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
      if( sqlite3GlobalConfig.bCoreMutex && !sqlite3GlobalConfig.pInitMutex ){
        rc = SQLITE_NOMEM_BKPT;
      }
    }
  }
  if( rc==SQLITE_OK ){
    sqlite3GlobalConfig.nRefInitMutex++;
  }
  sqlite3_mutex_leave(pMaster);
................................................................................
  **
  ** The following mutex is what serializes access to the appdef pcache xInit
  ** methods.  The sqlite3_pcache_methods.xInit() all is embedded in the
  ** call to sqlite3PcacheInitialize().
  */
  sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex);
  if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){

    sqlite3GlobalConfig.inProgress = 1;
#ifdef SQLITE_ENABLE_SQLLOG
    {
      extern void sqlite3_init_sqllog(void);
      sqlite3_init_sqllog();
    }
#endif
    memset(&sqlite3BuiltinFunctions, 0, sizeof(sqlite3BuiltinFunctions));
    sqlite3RegisterBuiltinFunctions();
    if( sqlite3GlobalConfig.isPCacheInit==0 ){
      rc = sqlite3PcacheInitialize();
    }
    if( rc==SQLITE_OK ){
      sqlite3GlobalConfig.isPCacheInit = 1;
      rc = sqlite3OsInit();
    }
................................................................................
/*
** Invoke the destructor function associated with FuncDef p, if any. Except,
** if this is not the last copy of the function, do not invoke it. Multiple
** copies of a single function are created when create_function() is called
** with SQLITE_ANY as the encoding.
*/
static void functionDestroy(sqlite3 *db, FuncDef *p){
  FuncDestructor *pDestructor = p->u.pDestructor;
  if( pDestructor ){
    pDestructor->nRef--;
    if( pDestructor->nRef==0 ){
      pDestructor->xDestroy(pDestructor->pUserData);
      sqlite3DbFree(db, pDestructor);
    }
  }
................................................................................
  assert( db->aDb==db->aDbStatic );

  /* Tell the code in notify.c that the connection no longer holds any
  ** locks and does not require any further unlock-notify callbacks.
  */
  sqlite3ConnectionClosed(db);

  for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){
    FuncDef *pNext, *p;
    p = sqliteHashData(i);


    do{
      functionDestroy(db, p);
      pNext = p->pNext;
      sqlite3DbFree(db, p);
      p = pNext;
    }while( p );
  }


  sqlite3HashClear(&db->aFunc);
  for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){
    CollSeq *pColl = (CollSeq *)sqliteHashData(i);
    /* Invoke any destructors registered for collation sequence user data. */
    for(j=0; j<3; j++){
      if( pColl[j].xDel ){
        pColl[j].xDel(pColl[j].pUser);
      }
................................................................................
#endif
  
  /* Check if an existing function is being overridden or deleted. If so,
  ** and there are active VMs, then return SQLITE_BUSY. If a function
  ** is being overridden/deleted but there are no active VMs, allow the
  ** operation to continue but invalidate all precompiled statements.
  */
  p = sqlite3FindFunction(db, zFunctionName, nArg, (u8)enc, 0);
  if( p && (p->funcFlags & SQLITE_FUNC_ENCMASK)==enc && p->nArg==nArg ){
    if( db->nVdbeActive ){
      sqlite3ErrorWithMsg(db, SQLITE_BUSY, 
        "unable to delete/modify user-function due to active statements");
      assert( !db->mallocFailed );
      return SQLITE_BUSY;
    }else{
      sqlite3ExpirePreparedStatements(db);
    }
  }

  p = sqlite3FindFunction(db, zFunctionName, nArg, (u8)enc, 1);
  assert(p || db->mallocFailed);
  if( !p ){
    return SQLITE_NOMEM_BKPT;
  }

  /* If an older version of the function with a configured destructor is
  ** being replaced invoke the destructor function here. */
  functionDestroy(db, p);

  if( pDestructor ){
    pDestructor->nRef++;
  }
  p->u.pDestructor = pDestructor;
  p->funcFlags = (p->funcFlags & SQLITE_FUNC_ENCMASK) | extraFlags;
  testcase( p->funcFlags & SQLITE_DETERMINISTIC );
  p->xSFunc = xSFunc ? xSFunc : xStep;
  p->xFinalize = xFinal;
  p->pUserData = pUserData;
  p->nArg = (u16)nArg;
  return SQLITE_OK;
................................................................................
** properly.
*/
int sqlite3_overload_function(
  sqlite3 *db,
  const char *zName,
  int nArg
){

  int rc = SQLITE_OK;

#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) || zName==0 || nArg<-2 ){
    return SQLITE_MISUSE_BKPT;
  }
#endif
  sqlite3_mutex_enter(db->mutex);
  if( sqlite3FindFunction(db, zName, nArg, SQLITE_UTF8, 0)==0 ){
    rc = sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
                           0, sqlite3InvalidFunction, 0, 0, 0);
  }
  rc = sqlite3ApiExit(db, rc);
  sqlite3_mutex_leave(db->mutex);
  return rc;
}
................................................................................
/*
** Return UTF-8 encoded English language explanation of the most recent
** error.
*/
const char *sqlite3_errmsg(sqlite3 *db){
  const char *z;
  if( !db ){
    return sqlite3ErrStr(SQLITE_NOMEM_BKPT);
  }
  if( !sqlite3SafetyCheckSickOrOk(db) ){
    return sqlite3ErrStr(SQLITE_MISUSE_BKPT);
  }
  sqlite3_mutex_enter(db->mutex);
  if( db->mallocFailed ){
    z = sqlite3ErrStr(SQLITE_NOMEM_BKPT);
  }else{
    testcase( db->pErr==0 );
    z = (char*)sqlite3_value_text(db->pErr);
    assert( !db->mallocFailed );
    if( z==0 ){
      z = sqlite3ErrStr(db->errCode);
    }
................................................................................
** passed to this function, we assume a malloc() failed during sqlite3_open().
*/
int sqlite3_errcode(sqlite3 *db){
  if( db && !sqlite3SafetyCheckSickOrOk(db) ){
    return SQLITE_MISUSE_BKPT;
  }
  if( !db || db->mallocFailed ){
    return SQLITE_NOMEM_BKPT;
  }
  return db->errCode & db->errMask;
}
int sqlite3_extended_errcode(sqlite3 *db){
  if( db && !sqlite3SafetyCheckSickOrOk(db) ){
    return SQLITE_MISUSE_BKPT;
  }
  if( !db || db->mallocFailed ){
    return SQLITE_NOMEM_BKPT;
  }
  return db->errCode;
}

/*
** Return a string that describes the kind of error specified in the
** argument.  For now, this simply calls the internal sqlite3ErrStr()
................................................................................
          p->xCmp = 0;
        }
      }
    }
  }

  pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 1);
  if( pColl==0 ) return SQLITE_NOMEM_BKPT;
  pColl->xCmp = xCompare;
  pColl->pUser = pCtx;
  pColl->xDel = xDel;
  pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED));
  sqlite3Error(db, SQLITE_OK);
  return SQLITE_OK;
}
................................................................................
#endif
#if SQLITE_MAX_COMPOUND_SELECT<2
# error SQLITE_MAX_COMPOUND_SELECT must be at least 2
#endif
#if SQLITE_MAX_VDBE_OP<40
# error SQLITE_MAX_VDBE_OP must be at least 40
#endif
#if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>127
# error SQLITE_MAX_FUNCTION_ARG must be between 0 and 127
#endif
#if SQLITE_MAX_ATTACHED<0 || SQLITE_MAX_ATTACHED>125
# error SQLITE_MAX_ATTACHED must be between 0 and 125
#endif
#if SQLITE_MAX_LIKE_PATTERN_LENGTH<1
# error SQLITE_MAX_LIKE_PATTERN_LENGTH must be at least 1
#endif
................................................................................

    /* Make sure the SQLITE_OPEN_URI flag is set to indicate to the VFS xOpen 
    ** method that there may be extra parameters following the file-name.  */
    flags |= SQLITE_OPEN_URI;

    for(iIn=0; iIn<nUri; iIn++) nByte += (zUri[iIn]=='&');
    zFile = sqlite3_malloc64(nByte);
    if( !zFile ) return SQLITE_NOMEM_BKPT;

    iIn = 5;
#ifdef SQLITE_ALLOW_URI_AUTHORITY
    if( strncmp(zUri+5, "///", 3)==0 ){
      iIn = 7;
      /* The following condition causes URIs with five leading / characters
      ** like file://///host/path to be converted into UNCs like //host/path.
................................................................................
      }

      zOpt = &zVal[nVal+1];
    }

  }else{
    zFile = sqlite3_malloc64(nUri+2);
    if( !zFile ) return SQLITE_NOMEM_BKPT;
    memcpy(zFile, zUri, nUri);
    zFile[nUri] = '\0';
    zFile[nUri+1] = '\0';
    flags &= ~SQLITE_OPEN_URI;
  }

  *ppVfs = sqlite3_vfs_find(zVfs);
................................................................................
  }

  /* Open the backend database driver */
  rc = sqlite3BtreeOpen(db->pVfs, zOpen, db, &db->aDb[0].pBt, 0,
                        flags | SQLITE_OPEN_MAIN_DB);
  if( rc!=SQLITE_OK ){
    if( rc==SQLITE_IOERR_NOMEM ){
      rc = SQLITE_NOMEM_BKPT;
    }
    sqlite3Error(db, rc);
    goto opendb_out;
  }
  sqlite3BtreeEnter(db->aDb[0].pBt);
  db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
  if( !db->mallocFailed ) ENC(db) = SCHEMA_ENC(db);
  sqlite3BtreeLeave(db->aDb[0].pBt);
  db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);

  /* The default safety_level for the main database is FULL; for the temp
  ** database it is OFF. This matches the pager layer defaults.  
  */
  db->aDb[0].zName = "main";
  db->aDb[0].safety_level = PAGER_SYNCHRONOUS_FULL;
  db->aDb[1].zName = "temp";
  db->aDb[1].safety_level = PAGER_SYNCHRONOUS_OFF;

  db->magic = SQLITE_MAGIC_OPEN;
  if( db->mallocFailed ){
    goto opendb_out;
  }

  /* Register all built-in functions, but do not attempt to read the
  ** database schema yet. This is delayed until the first time the database
  ** is accessed.
  */
  sqlite3Error(db, SQLITE_OK);
  sqlite3RegisterPerConnectionBuiltinFunctions(db);

  /* Load automatic extensions - extensions that have been registered
  ** using the sqlite3_automatic_extension() API.
  */
  rc = sqlite3_errcode(db);
  if( rc==SQLITE_OK ){
    sqlite3AutoLoadExtensions(db);
................................................................................
    rc = openDatabase(zFilename8, ppDb,
                      SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
    assert( *ppDb || rc==SQLITE_NOMEM );
    if( rc==SQLITE_OK && !DbHasProperty(*ppDb, 0, DB_SchemaLoaded) ){
      SCHEMA_ENC(*ppDb) = ENC(*ppDb) = SQLITE_UTF16NATIVE;
    }
  }else{
    rc = SQLITE_NOMEM_BKPT;
  }
  sqlite3ValueFree(pVal);

  return rc & 0xff;
}
#endif /* SQLITE_OMIT_UTF16 */

................................................................................
  }
#endif
  return db->autoCommit;
}

/*
** The following routines are substitutes for constants SQLITE_CORRUPT,
** SQLITE_MISUSE, SQLITE_CANTOPEN, SQLITE_NOMEM and possibly other error
** constants.  They serve two purposes:
**
**   1.  Serve as a convenient place to set a breakpoint in a debugger
**       to detect when version error conditions occurs.
**
**   2.  Invoke sqlite3_log() to provide the source code location where
**       a low-level error is first detected.
*/
static int reportError(int iErr, int lineno, const char *zType){
  sqlite3_log(iErr, "%s at line %d of [%.10s]",
              zType, lineno, 20+sqlite3_sourceid());
  return iErr;
}
int sqlite3CorruptError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return reportError(SQLITE_CORRUPT, lineno, "database corruption");
}
int sqlite3MisuseError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return reportError(SQLITE_MISUSE, lineno, "misuse");



}
int sqlite3CantopenError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return reportError(SQLITE_CANTOPEN, lineno, "cannot open file");


}
#ifdef SQLITE_DEBUG
int sqlite3NomemError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return reportError(SQLITE_NOMEM, lineno, "OOM");
}
int sqlite3IoerrnomemError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return reportError(SQLITE_IOERR_NOMEM, lineno, "I/O OOM error");
}
#endif

#ifndef SQLITE_OMIT_DEPRECATED
/*
** This is a convenience routine that makes sure that all thread-specific
** data for this thread has been deallocated.
**
** SQLite no longer uses thread-specific data so this routine is now a

/*
** Take actions at the end of an API call to indicate an OOM error
*/
static SQLITE_NOINLINE int apiOomError(sqlite3 *db){
  sqlite3OomClear(db);
  sqlite3Error(db, SQLITE_NOMEM);
  return SQLITE_NOMEM;
}

/*
** This function must be called before exiting any API function (i.e. 
** returning control to the user) that has called sqlite3_malloc or
** sqlite3_realloc.
**

/*
** Take actions at the end of an API call to indicate an OOM error
*/
static SQLITE_NOINLINE int apiOomError(sqlite3 *db){
  sqlite3OomClear(db);
  sqlite3Error(db, SQLITE_NOMEM);
  return SQLITE_NOMEM_BKPT;
}

/*
** This function must be called before exiting any API function (i.e. 
** returning control to the user) that has called sqlite3_malloc or
** sqlite3_realloc.
**

    int iChunkOffset = (int)(p->endpoint.iOffset%JOURNAL_CHUNKSIZE);
    int iSpace = MIN(nWrite, JOURNAL_CHUNKSIZE - iChunkOffset);

    if( iChunkOffset==0 ){
      /* New chunk is required to extend the file. */
      FileChunk *pNew = sqlite3_malloc(sizeof(FileChunk));
      if( !pNew ){
        return SQLITE_IOERR_NOMEM;
      }
      pNew->pNext = 0;
      if( pChunk ){
        assert( p->pFirst );
        pChunk->pNext = pNew;
      }else{
        assert( !p->pFirst );

    int iChunkOffset = (int)(p->endpoint.iOffset%JOURNAL_CHUNKSIZE);
    int iSpace = MIN(nWrite, JOURNAL_CHUNKSIZE - iChunkOffset);

    if( iChunkOffset==0 ){
      /* New chunk is required to extend the file. */
      FileChunk *pNew = sqlite3_malloc(sizeof(FileChunk));
      if( !pNew ){
        return SQLITE_IOERR_NOMEM_BKPT;
      }
      pNew->pNext = 0;
      if( pChunk ){
        assert( p->pFirst );
        pChunk->pNext = pNew;
      }else{
        assert( !p->pFirst );

**
*/
#if defined(SQLITE_TEST)
int sqlite3_memdebug_vfs_oom_test = 1;
  #define DO_OS_MALLOC_TEST(x)                                       \
  if (sqlite3_memdebug_vfs_oom_test && (!x || !sqlite3IsMemJournal(x))) {  \
    void *pTstAlloc = sqlite3Malloc(10);                             \
    if (!pTstAlloc) return SQLITE_IOERR_NOMEM;                       \
    sqlite3_free(pTstAlloc);                                         \
  }
#else
  #define DO_OS_MALLOC_TEST(x)
#endif

/*
................................................................................
int sqlite3OsOpenMalloc(
  sqlite3_vfs *pVfs,
  const char *zFile,
  sqlite3_file **ppFile,
  int flags,
  int *pOutFlags
){
  int rc = SQLITE_NOMEM;
  sqlite3_file *pFile;
  pFile = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile);
  if( pFile ){
    rc = sqlite3OsOpen(pVfs, zFile, pFile, flags, pOutFlags);
    if( rc!=SQLITE_OK ){
      sqlite3_free(pFile);
    }else{
      *ppFile = pFile;
    }


  }
  return rc;
}
int sqlite3OsCloseFree(sqlite3_file *pFile){
  int rc = SQLITE_OK;
  assert( pFile );
  rc = sqlite3OsClose(pFile);
................................................................................
** This function is a wrapper around the OS specific implementation of
** sqlite3_os_init(). The purpose of the wrapper is to provide the
** ability to simulate a malloc failure, so that the handling of an
** error in sqlite3_os_init() by the upper layers can be tested.
*/
int sqlite3OsInit(void){
  void *p = sqlite3_malloc(10);
  if( p==0 ) return SQLITE_NOMEM;
  sqlite3_free(p);
  return sqlite3_os_init();
}

/*
** The list of all registered VFS implementations.
*/

**
*/
#if defined(SQLITE_TEST)
int sqlite3_memdebug_vfs_oom_test = 1;
  #define DO_OS_MALLOC_TEST(x)                                       \
  if (sqlite3_memdebug_vfs_oom_test && (!x || !sqlite3IsMemJournal(x))) {  \
    void *pTstAlloc = sqlite3Malloc(10);                             \
    if (!pTstAlloc) return SQLITE_IOERR_NOMEM_BKPT;                  \
    sqlite3_free(pTstAlloc);                                         \
  }
#else
  #define DO_OS_MALLOC_TEST(x)
#endif

/*
................................................................................
int sqlite3OsOpenMalloc(
  sqlite3_vfs *pVfs,
  const char *zFile,
  sqlite3_file **ppFile,
  int flags,
  int *pOutFlags
){
  int rc;
  sqlite3_file *pFile;
  pFile = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile);
  if( pFile ){
    rc = sqlite3OsOpen(pVfs, zFile, pFile, flags, pOutFlags);
    if( rc!=SQLITE_OK ){
      sqlite3_free(pFile);
    }else{
      *ppFile = pFile;
    }
  }else{
    rc = SQLITE_NOMEM_BKPT;
  }
  return rc;
}
int sqlite3OsCloseFree(sqlite3_file *pFile){
  int rc = SQLITE_OK;
  assert( pFile );
  rc = sqlite3OsClose(pFile);
................................................................................
** This function is a wrapper around the OS specific implementation of
** sqlite3_os_init(). The purpose of the wrapper is to provide the
** ability to simulate a malloc failure, so that the handling of an
** error in sqlite3_os_init() by the upper layers can be tested.
*/
int sqlite3OsInit(void){
  void *p = sqlite3_malloc(10);
  if( p==0 ) return SQLITE_NOMEM_BKPT;
  sqlite3_free(p);
  return sqlite3_os_init();
}

/*
** The list of all registered VFS implementations.
*/

  pInode = inodeList;
  while( pInode && memcmp(&fileId, &pInode->fileId, sizeof(fileId)) ){
    pInode = pInode->pNext;
  }
  if( pInode==0 ){
    pInode = sqlite3_malloc64( sizeof(*pInode) );
    if( pInode==0 ){
      return SQLITE_NOMEM;
    }
    memset(pInode, 0, sizeof(*pInode));
    memcpy(&pInode->fileId, &fileId, sizeof(fileId));
    pInode->nRef = 1;
    pInode->pNext = inodeList;
    pInode->pPrev = 0;
    if( inodeList ) inodeList->pPrev = pInode;
................................................................................
  int rc;                         /* Result code */
  unixInodeInfo *pInode;          /* The inode of fd */
  char *zShmFilename;             /* Name of the file used for SHM */
  int nShmFilename;               /* Size of the SHM filename in bytes */

  /* Allocate space for the new unixShm object. */
  p = sqlite3_malloc64( sizeof(*p) );
  if( p==0 ) return SQLITE_NOMEM;
  memset(p, 0, sizeof(*p));
  assert( pDbFd->pShm==0 );

  /* Check to see if a unixShmNode object already exists. Reuse an existing
  ** one if present. Create a new one if necessary.
  */
  unixEnterMutex();
................................................................................
#ifdef SQLITE_SHM_DIRECTORY
    nShmFilename = sizeof(SQLITE_SHM_DIRECTORY) + 31;
#else
    nShmFilename = 6 + (int)strlen(zBasePath);
#endif
    pShmNode = sqlite3_malloc64( sizeof(*pShmNode) + nShmFilename );
    if( pShmNode==0 ){
      rc = SQLITE_NOMEM;
      goto shm_open_err;
    }
    memset(pShmNode, 0, sizeof(*pShmNode)+nShmFilename);
    zShmFilename = pShmNode->zFilename = (char*)&pShmNode[1];
#ifdef SQLITE_SHM_DIRECTORY
    sqlite3_snprintf(nShmFilename, zShmFilename, 
                     SQLITE_SHM_DIRECTORY "/sqlite-shm-%x-%x",
................................................................................
    sqlite3FileSuffix3(pDbFd->zPath, zShmFilename);
#endif
    pShmNode->h = -1;
    pDbFd->pInode->pShmNode = pShmNode;
    pShmNode->pInode = pDbFd->pInode;
    pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
    if( pShmNode->mutex==0 ){
      rc = SQLITE_NOMEM;
      goto shm_open_err;
    }

    if( pInode->bProcessLock==0 ){
      int openFlags = O_RDWR | O_CREAT;
      if( sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
        openFlags = O_RDONLY;
................................................................................
    }

    /* Map the requested memory region into this processes address space. */
    apNew = (char **)sqlite3_realloc(
        pShmNode->apRegion, nReqRegion*sizeof(char *)
    );
    if( !apNew ){
      rc = SQLITE_IOERR_NOMEM;
      goto shmpage_out;
    }
    pShmNode->apRegion = apNew;
    while( pShmNode->nRegion<nReqRegion ){
      int nMap = szRegion*nShmPerMap;
      int i;
      void *pMem;
................................................................................
        if( pMem==MAP_FAILED ){
          rc = unixLogError(SQLITE_IOERR_SHMMAP, "mmap", pShmNode->zFilename);
          goto shmpage_out;
        }
      }else{
        pMem = sqlite3_malloc64(szRegion);
        if( pMem==0 ){
          rc = SQLITE_NOMEM;
          goto shmpage_out;
        }
        memset(pMem, 0, szRegion);
      }

      for(i=0; i<nShmPerMap; i++){
        pShmNode->apRegion[pShmNode->nRegion+i] = &((char*)pMem)[szRegion*i];
................................................................................
    pNew->ctrlFlags |= UNIXFILE_EXCL;
  }

#if OS_VXWORKS
  pNew->pId = vxworksFindFileId(zFilename);
  if( pNew->pId==0 ){
    ctrlFlags |= UNIXFILE_NOLOCK;
    rc = SQLITE_NOMEM;
  }
#endif

  if( ctrlFlags & UNIXFILE_NOLOCK ){
    pLockingStyle = &nolockIoMethods;
  }else{
    pLockingStyle = (**(finder_type*)pVfs->pAppData)(zFilename, pNew);
................................................................................
  else if( pLockingStyle == &afpIoMethods ){
    /* AFP locking uses the file path so it needs to be included in
    ** the afpLockingContext.
    */
    afpLockingContext *pCtx;
    pNew->lockingContext = pCtx = sqlite3_malloc64( sizeof(*pCtx) );
    if( pCtx==0 ){
      rc = SQLITE_NOMEM;
    }else{
      /* NB: zFilename exists and remains valid until the file is closed
      ** according to requirement F11141.  So we do not need to make a
      ** copy of the filename. */
      pCtx->dbPath = zFilename;
      pCtx->reserved = 0;
      srandomdev();
................................................................................
    */
    char *zLockFile;
    int nFilename;
    assert( zFilename!=0 );
    nFilename = (int)strlen(zFilename) + 6;
    zLockFile = (char *)sqlite3_malloc64(nFilename);
    if( zLockFile==0 ){
      rc = SQLITE_NOMEM;
    }else{
      sqlite3_snprintf(nFilename, zLockFile, "%s" DOTLOCK_SUFFIX, zFilename);
    }
    pNew->lockingContext = zLockFile;
  }

#if OS_VXWORKS
................................................................................
      int n;
      sqlite3_snprintf(MAX_PATHNAME, zSemName, "/%s.sem",
                       pNew->pId->zCanonicalName);
      for( n=1; zSemName[n]; n++ )
        if( zSemName[n]=='/' ) zSemName[n] = '_';
      pNew->pInode->pSem = sem_open(zSemName, O_CREAT, 0666, 1);
      if( pNew->pInode->pSem == SEM_FAILED ){
        rc = SQLITE_NOMEM;
        pNew->pInode->aSemName[0] = '\0';
      }
    }
    unixLeaveMutex();
  }
#endif
  
................................................................................
    UnixUnusedFd *pUnused;
    pUnused = findReusableFd(zName, flags);
    if( pUnused ){
      fd = pUnused->fd;
    }else{
      pUnused = sqlite3_malloc64(sizeof(*pUnused));
      if( !pUnused ){
        return SQLITE_NOMEM;
      }
    }
    p->pUnused = pUnused;

    /* Database filenames are double-zero terminated if they are not
    ** URIs with parameters.  Hence, they can always be passed into
    ** sqlite3_uri_parameter(). */
................................................................................
  if( isDelete ){
#if OS_VXWORKS
    zPath = zName;
#elif defined(SQLITE_UNLINK_AFTER_CLOSE)
    zPath = sqlite3_mprintf("%s", zName);
    if( zPath==0 ){
      robust_close(p, fd, __LINE__);
      return SQLITE_NOMEM;
    }
#else
    osUnlink(zName);
#endif
  }
#if SQLITE_ENABLE_LOCKING_STYLE
  else{
................................................................................
    }else{
      bLink = S_ISLNK(buf.st_mode);
    }

    if( bLink ){
      if( zDel==0 ){
        zDel = sqlite3_malloc(nOut);
        if( zDel==0 ) rc = SQLITE_NOMEM;
      }else if( ++nLink>SQLITE_MAX_SYMLINKS ){
        rc = SQLITE_CANTOPEN_BKPT;
      }

      if( rc==SQLITE_OK ){
        nByte = osReadlink(zIn, zDel, nOut-1);
        if( nByte<0 ){
................................................................................
  */
  pUnused = findReusableFd(path, openFlags);
  if( pUnused ){
    fd = pUnused->fd;
  }else{
    pUnused = sqlite3_malloc64(sizeof(*pUnused));
    if( !pUnused ){
      return SQLITE_NOMEM;
    }
  }
  if( fd<0 ){
    fd = robust_open(path, openFlags, 0);
    terrno = errno;
    if( fd<0 && errno==ENOENT && islockfile ){
      if( proxyCreateLockPath(path) == SQLITE_OK ){
................................................................................
      default:
        return SQLITE_CANTOPEN_BKPT;
    }
  }
  
  pNew = (unixFile *)sqlite3_malloc64(sizeof(*pNew));
  if( pNew==NULL ){
    rc = SQLITE_NOMEM;
    goto end_create_proxy;
  }
  memset(pNew, 0, sizeof(unixFile));
  pNew->openFlags = openFlags;
  memset(&dummyVfs, 0, sizeof(dummyVfs));
  dummyVfs.pAppData = (void*)&autolockIoFinder;
  dummyVfs.zName = "dummy";
................................................................................
      if( rc==SQLITE_OK ){
        /* Need to make a copy of path if we extracted the value
         ** from the conch file or the path was allocated on the stack
         */
        if( tempLockPath ){
          pCtx->lockProxyPath = sqlite3DbStrDup(0, tempLockPath);
          if( !pCtx->lockProxyPath ){
            rc = SQLITE_NOMEM;
          }
        }
      }
      if( rc==SQLITE_OK ){
        pCtx->conchHeld = 1;
        
        if( pCtx->lockProxy->pMethod == &afpIoMethods ){
................................................................................
  int len = (int)strlen(dbPath); /* Length of database filename - dbPath */
  char *conchPath;              /* buffer in which to construct conch name */

  /* Allocate space for the conch filename and initialize the name to
  ** the name of the original database file. */  
  *pConchPath = conchPath = (char *)sqlite3_malloc64(len + 8);
  if( conchPath==0 ){
    return SQLITE_NOMEM;
  }
  memcpy(conchPath, dbPath, len+1);
  
  /* now insert a "." before the last / character */
  for( i=(len-1); i>=0; i-- ){
    if( conchPath[i]=='/' ){
      i++;
................................................................................
  }
  
  OSTRACE(("TRANSPROXY  %d for %s pid=%d\n", pFile->h,
           (lockPath ? lockPath : ":auto:"), osGetpid(0)));

  pCtx = sqlite3_malloc64( sizeof(*pCtx) );
  if( pCtx==0 ){
    return SQLITE_NOMEM;
  }
  memset(pCtx, 0, sizeof(*pCtx));

  rc = proxyCreateConchPathname(dbPath, &pCtx->conchFilePath);
  if( rc==SQLITE_OK ){
    rc = proxyCreateUnixFile(pCtx->conchFilePath, &pCtx->conchFile, 0);
    if( rc==SQLITE_CANTOPEN && ((pFile->openFlags&O_RDWR) == 0) ){
................................................................................
  if( rc==SQLITE_OK && lockPath ){
    pCtx->lockProxyPath = sqlite3DbStrDup(0, lockPath);
  }

  if( rc==SQLITE_OK ){
    pCtx->dbPath = sqlite3DbStrDup(0, dbPath);
    if( pCtx->dbPath==NULL ){
      rc = SQLITE_NOMEM;
    }
  }
  if( rc==SQLITE_OK ){
    /* all memory is allocated, proxys are created and assigned, 
    ** switch the locking context and pMethod then return.
    */
    pCtx->oldLockingContext = pFile->lockingContext;

  pInode = inodeList;
  while( pInode && memcmp(&fileId, &pInode->fileId, sizeof(fileId)) ){
    pInode = pInode->pNext;
  }
  if( pInode==0 ){
    pInode = sqlite3_malloc64( sizeof(*pInode) );
    if( pInode==0 ){
      return SQLITE_NOMEM_BKPT;
    }
    memset(pInode, 0, sizeof(*pInode));
    memcpy(&pInode->fileId, &fileId, sizeof(fileId));
    pInode->nRef = 1;
    pInode->pNext = inodeList;
    pInode->pPrev = 0;
    if( inodeList ) inodeList->pPrev = pInode;
................................................................................
  int rc;                         /* Result code */
  unixInodeInfo *pInode;          /* The inode of fd */
  char *zShmFilename;             /* Name of the file used for SHM */
  int nShmFilename;               /* Size of the SHM filename in bytes */

  /* Allocate space for the new unixShm object. */
  p = sqlite3_malloc64( sizeof(*p) );
  if( p==0 ) return SQLITE_NOMEM_BKPT;
  memset(p, 0, sizeof(*p));
  assert( pDbFd->pShm==0 );

  /* Check to see if a unixShmNode object already exists. Reuse an existing
  ** one if present. Create a new one if necessary.
  */
  unixEnterMutex();
................................................................................
#ifdef SQLITE_SHM_DIRECTORY
    nShmFilename = sizeof(SQLITE_SHM_DIRECTORY) + 31;
#else
    nShmFilename = 6 + (int)strlen(zBasePath);
#endif
    pShmNode = sqlite3_malloc64( sizeof(*pShmNode) + nShmFilename );
    if( pShmNode==0 ){
      rc = SQLITE_NOMEM_BKPT;
      goto shm_open_err;
    }
    memset(pShmNode, 0, sizeof(*pShmNode)+nShmFilename);
    zShmFilename = pShmNode->zFilename = (char*)&pShmNode[1];
#ifdef SQLITE_SHM_DIRECTORY
    sqlite3_snprintf(nShmFilename, zShmFilename, 
                     SQLITE_SHM_DIRECTORY "/sqlite-shm-%x-%x",
................................................................................
    sqlite3FileSuffix3(pDbFd->zPath, zShmFilename);
#endif
    pShmNode->h = -1;
    pDbFd->pInode->pShmNode = pShmNode;
    pShmNode->pInode = pDbFd->pInode;
    pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
    if( pShmNode->mutex==0 ){
      rc = SQLITE_NOMEM_BKPT;
      goto shm_open_err;
    }

    if( pInode->bProcessLock==0 ){
      int openFlags = O_RDWR | O_CREAT;
      if( sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
        openFlags = O_RDONLY;
................................................................................
    }

    /* Map the requested memory region into this processes address space. */
    apNew = (char **)sqlite3_realloc(
        pShmNode->apRegion, nReqRegion*sizeof(char *)
    );
    if( !apNew ){
      rc = SQLITE_IOERR_NOMEM_BKPT;
      goto shmpage_out;
    }
    pShmNode->apRegion = apNew;
    while( pShmNode->nRegion<nReqRegion ){
      int nMap = szRegion*nShmPerMap;
      int i;
      void *pMem;
................................................................................
        if( pMem==MAP_FAILED ){
          rc = unixLogError(SQLITE_IOERR_SHMMAP, "mmap", pShmNode->zFilename);
          goto shmpage_out;
        }
      }else{
        pMem = sqlite3_malloc64(szRegion);
        if( pMem==0 ){
          rc = SQLITE_NOMEM_BKPT;
          goto shmpage_out;
        }
        memset(pMem, 0, szRegion);
      }

      for(i=0; i<nShmPerMap; i++){
        pShmNode->apRegion[pShmNode->nRegion+i] = &((char*)pMem)[szRegion*i];
................................................................................
    pNew->ctrlFlags |= UNIXFILE_EXCL;
  }

#if OS_VXWORKS
  pNew->pId = vxworksFindFileId(zFilename);
  if( pNew->pId==0 ){
    ctrlFlags |= UNIXFILE_NOLOCK;
    rc = SQLITE_NOMEM_BKPT;
  }
#endif

  if( ctrlFlags & UNIXFILE_NOLOCK ){
    pLockingStyle = &nolockIoMethods;
  }else{
    pLockingStyle = (**(finder_type*)pVfs->pAppData)(zFilename, pNew);
................................................................................
  else if( pLockingStyle == &afpIoMethods ){
    /* AFP locking uses the file path so it needs to be included in
    ** the afpLockingContext.
    */
    afpLockingContext *pCtx;
    pNew->lockingContext = pCtx = sqlite3_malloc64( sizeof(*pCtx) );
    if( pCtx==0 ){
      rc = SQLITE_NOMEM_BKPT;
    }else{
      /* NB: zFilename exists and remains valid until the file is closed
      ** according to requirement F11141.  So we do not need to make a
      ** copy of the filename. */
      pCtx->dbPath = zFilename;
      pCtx->reserved = 0;
      srandomdev();
................................................................................
    */
    char *zLockFile;
    int nFilename;
    assert( zFilename!=0 );
    nFilename = (int)strlen(zFilename) + 6;
    zLockFile = (char *)sqlite3_malloc64(nFilename);
    if( zLockFile==0 ){
      rc = SQLITE_NOMEM_BKPT;
    }else{
      sqlite3_snprintf(nFilename, zLockFile, "%s" DOTLOCK_SUFFIX, zFilename);
    }
    pNew->lockingContext = zLockFile;
  }

#if OS_VXWORKS
................................................................................
      int n;
      sqlite3_snprintf(MAX_PATHNAME, zSemName, "/%s.sem",
                       pNew->pId->zCanonicalName);
      for( n=1; zSemName[n]; n++ )
        if( zSemName[n]=='/' ) zSemName[n] = '_';
      pNew->pInode->pSem = sem_open(zSemName, O_CREAT, 0666, 1);
      if( pNew->pInode->pSem == SEM_FAILED ){
        rc = SQLITE_NOMEM_BKPT;
        pNew->pInode->aSemName[0] = '\0';
      }
    }
    unixLeaveMutex();
  }
#endif
  
................................................................................
    UnixUnusedFd *pUnused;
    pUnused = findReusableFd(zName, flags);
    if( pUnused ){
      fd = pUnused->fd;
    }else{
      pUnused = sqlite3_malloc64(sizeof(*pUnused));
      if( !pUnused ){
        return SQLITE_NOMEM_BKPT;
      }
    }
    p->pUnused = pUnused;

    /* Database filenames are double-zero terminated if they are not
    ** URIs with parameters.  Hence, they can always be passed into
    ** sqlite3_uri_parameter(). */
................................................................................
  if( isDelete ){
#if OS_VXWORKS
    zPath = zName;
#elif defined(SQLITE_UNLINK_AFTER_CLOSE)
    zPath = sqlite3_mprintf("%s", zName);
    if( zPath==0 ){
      robust_close(p, fd, __LINE__);
      return SQLITE_NOMEM_BKPT;
    }
#else
    osUnlink(zName);
#endif
  }
#if SQLITE_ENABLE_LOCKING_STYLE
  else{
................................................................................
    }else{
      bLink = S_ISLNK(buf.st_mode);
    }

    if( bLink ){
      if( zDel==0 ){
        zDel = sqlite3_malloc(nOut);
        if( zDel==0 ) rc = SQLITE_NOMEM_BKPT;
      }else if( ++nLink>SQLITE_MAX_SYMLINKS ){
        rc = SQLITE_CANTOPEN_BKPT;
      }

      if( rc==SQLITE_OK ){
        nByte = osReadlink(zIn, zDel, nOut-1);
        if( nByte<0 ){
................................................................................
  */
  pUnused = findReusableFd(path, openFlags);
  if( pUnused ){
    fd = pUnused->fd;
  }else{
    pUnused = sqlite3_malloc64(sizeof(*pUnused));
    if( !pUnused ){
      return SQLITE_NOMEM_BKPT;
    }
  }
  if( fd<0 ){
    fd = robust_open(path, openFlags, 0);
    terrno = errno;
    if( fd<0 && errno==ENOENT && islockfile ){
      if( proxyCreateLockPath(path) == SQLITE_OK ){
................................................................................
      default:
        return SQLITE_CANTOPEN_BKPT;
    }
  }
  
  pNew = (unixFile *)sqlite3_malloc64(sizeof(*pNew));
  if( pNew==NULL ){
    rc = SQLITE_NOMEM_BKPT;
    goto end_create_proxy;
  }
  memset(pNew, 0, sizeof(unixFile));
  pNew->openFlags = openFlags;
  memset(&dummyVfs, 0, sizeof(dummyVfs));
  dummyVfs.pAppData = (void*)&autolockIoFinder;
  dummyVfs.zName = "dummy";
................................................................................
      if( rc==SQLITE_OK ){
        /* Need to make a copy of path if we extracted the value
         ** from the conch file or the path was allocated on the stack
         */
        if( tempLockPath ){
          pCtx->lockProxyPath = sqlite3DbStrDup(0, tempLockPath);
          if( !pCtx->lockProxyPath ){
            rc = SQLITE_NOMEM_BKPT;
          }
        }
      }
      if( rc==SQLITE_OK ){
        pCtx->conchHeld = 1;
        
        if( pCtx->lockProxy->pMethod == &afpIoMethods ){
................................................................................
  int len = (int)strlen(dbPath); /* Length of database filename - dbPath */
  char *conchPath;              /* buffer in which to construct conch name */

  /* Allocate space for the conch filename and initialize the name to
  ** the name of the original database file. */  
  *pConchPath = conchPath = (char *)sqlite3_malloc64(len + 8);
  if( conchPath==0 ){
    return SQLITE_NOMEM_BKPT;
  }
  memcpy(conchPath, dbPath, len+1);
  
  /* now insert a "." before the last / character */
  for( i=(len-1); i>=0; i-- ){
    if( conchPath[i]=='/' ){
      i++;
................................................................................
  }
  
  OSTRACE(("TRANSPROXY  %d for %s pid=%d\n", pFile->h,
           (lockPath ? lockPath : ":auto:"), osGetpid(0)));

  pCtx = sqlite3_malloc64( sizeof(*pCtx) );
  if( pCtx==0 ){
    return SQLITE_NOMEM_BKPT;
  }
  memset(pCtx, 0, sizeof(*pCtx));

  rc = proxyCreateConchPathname(dbPath, &pCtx->conchFilePath);
  if( rc==SQLITE_OK ){
    rc = proxyCreateUnixFile(pCtx->conchFilePath, &pCtx->conchFile, 0);
    if( rc==SQLITE_CANTOPEN && ((pFile->openFlags&O_RDWR) == 0) ){
................................................................................
  if( rc==SQLITE_OK && lockPath ){
    pCtx->lockProxyPath = sqlite3DbStrDup(0, lockPath);
  }

  if( rc==SQLITE_OK ){
    pCtx->dbPath = sqlite3DbStrDup(0, dbPath);
    if( pCtx->dbPath==NULL ){
      rc = SQLITE_NOMEM_BKPT;
    }
  }
  if( rc==SQLITE_OK ){
    /* all memory is allocated, proxys are created and assigned, 
    ** switch the locking context and pMethod then return.
    */
    pCtx->oldLockingContext = pFile->lockingContext;

#endif
#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT
  if( (nLargest=osHeapCompact(hHeap, SQLITE_WIN32_HEAP_FLAGS))==0 ){
    DWORD lastErrno = osGetLastError();
    if( lastErrno==NO_ERROR ){
      sqlite3_log(SQLITE_NOMEM, "failed to HeapCompact (no space), heap=%p",
                  (void*)hHeap);
      rc = SQLITE_NOMEM;
    }else{
      sqlite3_log(SQLITE_ERROR, "failed to HeapCompact (%lu), heap=%p",
                  osGetLastError(), (void*)hHeap);
      rc = SQLITE_ERROR;
    }
  }
#else
................................................................................
    pWinMemData->hHeap = osHeapCreate(SQLITE_WIN32_HEAP_FLAGS,
                                      dwInitialSize, dwMaximumSize);
    if( !pWinMemData->hHeap ){
      sqlite3_log(SQLITE_NOMEM,
          "failed to HeapCreate (%lu), flags=%u, initSize=%lu, maxSize=%lu",
          osGetLastError(), SQLITE_WIN32_HEAP_FLAGS, dwInitialSize,
          dwMaximumSize);
      return SQLITE_NOMEM;
    }
    pWinMemData->bOwned = TRUE;
    assert( pWinMemData->bOwned );
  }
#else
  pWinMemData->hHeap = osGetProcessHeap();
  if( !pWinMemData->hHeap ){
    sqlite3_log(SQLITE_NOMEM,
        "failed to GetProcessHeap (%lu)", osGetLastError());
    return SQLITE_NOMEM;
  }
  pWinMemData->bOwned = FALSE;
  assert( !pWinMemData->bOwned );
#endif
  assert( pWinMemData->hHeap!=0 );
  assert( pWinMemData->hHeap!=INVALID_HANDLE_VALUE );
#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
................................................................................
  );
  assert( !ppDirectory || sqlite3MemdebugHasType(*ppDirectory, MEMTYPE_HEAP) );
  if( ppDirectory ){
    char *zValueUtf8 = 0;
    if( zValue && zValue[0] ){
      zValueUtf8 = winUnicodeToUtf8(zValue);
      if ( zValueUtf8==0 ){
        return SQLITE_NOMEM;
      }
    }
    sqlite3_free(*ppDirectory);
    *ppDirectory = zValueUtf8;
    return SQLITE_OK;
  }
  return SQLITE_ERROR;
................................................................................
  DWORD lastErrno;
  BOOL bLogged = FALSE;
  BOOL bInit = TRUE;

  zName = winUtf8ToUnicode(zFilename);
  if( zName==0 ){
    /* out of memory */
    return SQLITE_IOERR_NOMEM;
  }

  /* Initialize the local lockdata */
  memset(&pFile->local, 0, sizeof(pFile->local));

  /* Replace the backslashes from the filename and lowercase it
  ** to derive a mutex name. */
................................................................................

  assert( pDbFd->pShm==0 );    /* Not previously opened */

  /* Allocate space for the new sqlite3_shm object.  Also speculatively
  ** allocate space for a new winShmNode and filename.
  */
  p = sqlite3MallocZero( sizeof(*p) );
  if( p==0 ) return SQLITE_IOERR_NOMEM;
  nName = sqlite3Strlen30(pDbFd->zPath);
  pNew = sqlite3MallocZero( sizeof(*pShmNode) + nName + 17 );
  if( pNew==0 ){
    sqlite3_free(p);
    return SQLITE_IOERR_NOMEM;
  }
  pNew->zFilename = (char*)&pNew[1];
  sqlite3_snprintf(nName+15, pNew->zFilename, "%s-shm", pDbFd->zPath);
  sqlite3FileSuffix3(pDbFd->zPath, pNew->zFilename);

  /* Look to see if there is an existing winShmNode that can be used.
  ** If no matching winShmNode currently exists, create a new one.
................................................................................
    pNew = 0;
    ((winFile*)(&pShmNode->hFile))->h = INVALID_HANDLE_VALUE;
    pShmNode->pNext = winShmNodeList;
    winShmNodeList = pShmNode;

    pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
    if( pShmNode->mutex==0 ){
      rc = SQLITE_IOERR_NOMEM;
      goto shm_open_err;
    }

    rc = winOpen(pDbFd->pVfs,
                 pShmNode->zFilename,             /* Name of the file (UTF-8) */
                 (sqlite3_file*)&pShmNode->hFile,  /* File handle here */
                 SQLITE_OPEN_WAL | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
................................................................................
    }

    /* Map the requested memory region into this processes address space. */
    apNew = (struct ShmRegion *)sqlite3_realloc64(
        pShmNode->aRegion, (iRegion+1)*sizeof(apNew[0])
    );
    if( !apNew ){
      rc = SQLITE_IOERR_NOMEM;
      goto shmpage_out;
    }
    pShmNode->aRegion = apNew;

    while( pShmNode->nRegion<=iRegion ){
      HANDLE hMap = NULL;         /* file-mapping handle */
      void *pMap = 0;             /* Mapped memory region */
................................................................................
  /* Allocate a temporary buffer to store the fully qualified file
  ** name for the temporary file.  If this fails, we cannot continue.
  */
  nMax = pVfs->mxPathname; nBuf = nMax + 2;
  zBuf = sqlite3MallocZero( nBuf );
  if( !zBuf ){
    OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
    return SQLITE_IOERR_NOMEM;
  }

  /* Figure out the effective temporary directory.  First, check if one
  ** has been explicitly set by the application; otherwise, use the one
  ** configured by the operating system.
  */
  nDir = nMax - (nPre + 15);
................................................................................
      ** prior to using it.
      */
      if( winIsDriveLetterAndColon(zDir) ){
        zConverted = winConvertFromUtf8Filename(zDir);
        if( !zConverted ){
          sqlite3_free(zBuf);
          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
          return SQLITE_IOERR_NOMEM;
        }
        if( winIsDir(zConverted) ){
          sqlite3_snprintf(nMax, zBuf, "%s", zDir);
          sqlite3_free(zConverted);
          break;
        }
        sqlite3_free(zConverted);
      }else{
        zConverted = sqlite3MallocZero( nMax+1 );
        if( !zConverted ){
          sqlite3_free(zBuf);
          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
          return SQLITE_IOERR_NOMEM;
        }
        if( cygwin_conv_path(
                osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A, zDir,
                zConverted, nMax+1)<0 ){
          sqlite3_free(zConverted);
          sqlite3_free(zBuf);
          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_CONVPATH\n"));
................................................................................
          ** its name into UTF-8 (i.e. if it is UTF-16 right now).
          */
          char *zUtf8 = winConvertToUtf8Filename(zConverted);
          if( !zUtf8 ){
            sqlite3_free(zConverted);
            sqlite3_free(zBuf);
            OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
            return SQLITE_IOERR_NOMEM;
          }
          sqlite3_snprintf(nMax, zBuf, "%s", zUtf8);
          sqlite3_free(zUtf8);
          sqlite3_free(zConverted);
          break;
        }
        sqlite3_free(zConverted);
................................................................................
#elif !SQLITE_OS_WINRT && !defined(__CYGWIN__)
  else if( osIsNT() ){
    char *zMulti;
    LPWSTR zWidePath = sqlite3MallocZero( nMax*sizeof(WCHAR) );
    if( !zWidePath ){
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM;
    }
    if( osGetTempPathW(nMax, zWidePath)==0 ){
      sqlite3_free(zWidePath);
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_GETTEMPPATH\n"));
      return winLogError(SQLITE_IOERR_GETTEMPPATH, osGetLastError(),
                         "winGetTempname2", 0);
................................................................................
      sqlite3_snprintf(nMax, zBuf, "%s", zMulti);
      sqlite3_free(zMulti);
      sqlite3_free(zWidePath);
    }else{
      sqlite3_free(zWidePath);
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM;
    }
  }
#ifdef SQLITE_WIN32_HAS_ANSI
  else{
    char *zUtf8;
    char *zMbcsPath = sqlite3MallocZero( nMax );
    if( !zMbcsPath ){
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM;
    }
    if( osGetTempPathA(nMax, zMbcsPath)==0 ){
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_GETTEMPPATH\n"));
      return winLogError(SQLITE_IOERR_GETTEMPPATH, osGetLastError(),
                         "winGetTempname3", 0);
    }
................................................................................
    zUtf8 = sqlite3_win32_mbcs_to_utf8(zMbcsPath);
    if( zUtf8 ){
      sqlite3_snprintf(nMax, zBuf, "%s", zUtf8);
      sqlite3_free(zUtf8);
    }else{
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM;
    }
  }
#endif /* SQLITE_WIN32_HAS_ANSI */
#endif /* !SQLITE_OS_WINRT */

  /*
  ** Check to make sure the temporary directory ends with an appropriate
................................................................................
       zUtf8Name[sqlite3Strlen30(zUtf8Name)+1]==0 );

  /* Convert the filename to the system encoding. */
  zConverted = winConvertFromUtf8Filename(zUtf8Name);
  if( zConverted==0 ){
    sqlite3_free(zTmpname);
    OSTRACE(("OPEN name=%s, rc=SQLITE_IOERR_NOMEM", zUtf8Name));
    return SQLITE_IOERR_NOMEM;
  }

  if( winIsDir(zConverted) ){
    sqlite3_free(zConverted);
    sqlite3_free(zTmpname);
    OSTRACE(("OPEN name=%s, rc=SQLITE_CANTOPEN_ISDIR", zUtf8Name));
    return SQLITE_CANTOPEN_ISDIR;
................................................................................

  SimulateIOError(return SQLITE_IOERR_DELETE);
  OSTRACE(("DELETE name=%s, syncDir=%d\n", zFilename, syncDir));

  zConverted = winConvertFromUtf8Filename(zFilename);
  if( zConverted==0 ){
    OSTRACE(("DELETE name=%s, rc=SQLITE_IOERR_NOMEM\n", zFilename));
    return SQLITE_IOERR_NOMEM;
  }
  if( osIsNT() ){
    do {
#if SQLITE_OS_WINRT
      WIN32_FILE_ATTRIBUTE_DATA sAttrData;
      memset(&sAttrData, 0, sizeof(sAttrData));
      if ( osGetFileAttributesExW(zConverted, GetFileExInfoStandard,
................................................................................
  SimulateIOError( return SQLITE_IOERR_ACCESS; );
  OSTRACE(("ACCESS name=%s, flags=%x, pResOut=%p\n",
           zFilename, flags, pResOut));

  zConverted = winConvertFromUtf8Filename(zFilename);
  if( zConverted==0 ){
    OSTRACE(("ACCESS name=%s, rc=SQLITE_IOERR_NOMEM\n", zFilename));
    return SQLITE_IOERR_NOMEM;
  }
  if( osIsNT() ){
    int cnt = 0;
    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
    memset(&sAttrData, 0, sizeof(sAttrData));
    while( !(rc = osGetFileAttributesExW((LPCWSTR)zConverted,
                             GetFileExInfoStandard,
................................................................................
    ** NOTE: We are dealing with a relative path name and the data
    **       directory has been set.  Therefore, use it as the basis
    **       for converting the relative path name to an absolute
    **       one by prepending the data directory and a slash.
    */
    char *zOut = sqlite3MallocZero( pVfs->mxPathname+1 );
    if( !zOut ){
      return SQLITE_IOERR_NOMEM;
    }
    if( cygwin_conv_path(
            (osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A) |
            CCP_RELATIVE, zRelative, zOut, pVfs->mxPathname+1)<0 ){
      sqlite3_free(zOut);
      return winLogError(SQLITE_CANTOPEN_CONVPATH, (DWORD)errno,
                         "winFullPathname1", zRelative);
    }else{
      char *zUtf8 = winConvertToUtf8Filename(zOut);
      if( !zUtf8 ){
        sqlite3_free(zOut);
        return SQLITE_IOERR_NOMEM;
      }
      sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s%c%s",
                       sqlite3_data_directory, winGetDirSep(), zUtf8);
      sqlite3_free(zUtf8);
      sqlite3_free(zOut);
    }
  }else{
    char *zOut = sqlite3MallocZero( pVfs->mxPathname+1 );
    if( !zOut ){
      return SQLITE_IOERR_NOMEM;
    }
    if( cygwin_conv_path(
            (osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A),
            zRelative, zOut, pVfs->mxPathname+1)<0 ){
      sqlite3_free(zOut);
      return winLogError(SQLITE_CANTOPEN_CONVPATH, (DWORD)errno,
                         "winFullPathname2", zRelative);
    }else{
      char *zUtf8 = winConvertToUtf8Filename(zOut);
      if( !zUtf8 ){
        sqlite3_free(zOut);
        return SQLITE_IOERR_NOMEM;
      }
      sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s", zUtf8);
      sqlite3_free(zUtf8);
      sqlite3_free(zOut);
    }
  }
  return SQLITE_OK;
................................................................................
    */
    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s%c%s",
                     sqlite3_data_directory, winGetDirSep(), zRelative);
    return SQLITE_OK;
  }
  zConverted = winConvertFromUtf8Filename(zRelative);
  if( zConverted==0 ){
    return SQLITE_IOERR_NOMEM;
  }
  if( osIsNT() ){
    LPWSTR zTemp;
    nByte = osGetFullPathNameW((LPCWSTR)zConverted, 0, 0, 0);
    if( nByte==0 ){
      sqlite3_free(zConverted);
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname1", zRelative);
    }
    nByte += 3;
    zTemp = sqlite3MallocZero( nByte*sizeof(zTemp[0]) );
    if( zTemp==0 ){
      sqlite3_free(zConverted);
      return SQLITE_IOERR_NOMEM;
    }
    nByte = osGetFullPathNameW((LPCWSTR)zConverted, nByte, zTemp, 0);
    if( nByte==0 ){
      sqlite3_free(zConverted);
      sqlite3_free(zTemp);
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname2", zRelative);
................................................................................
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname3", zRelative);
    }
    nByte += 3;
    zTemp = sqlite3MallocZero( nByte*sizeof(zTemp[0]) );
    if( zTemp==0 ){
      sqlite3_free(zConverted);
      return SQLITE_IOERR_NOMEM;
    }
    nByte = osGetFullPathNameA((char*)zConverted, nByte, zTemp, 0);
    if( nByte==0 ){
      sqlite3_free(zConverted);
      sqlite3_free(zTemp);
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname4", zRelative);
................................................................................
  }
#endif
  if( zOut ){
    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s", zOut);
    sqlite3_free(zOut);
    return SQLITE_OK;
  }else{
    return SQLITE_IOERR_NOMEM;
  }
#endif
}

#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Interfaces for opening a shared library, finding entry points
................................................................................
#else /* if SQLITE_OMIT_LOAD_EXTENSION is defined: */
  #define winDlOpen  0
  #define winDlError 0
  #define winDlSym   0
  #define winDlClose 0
#endif























/*
** Write up to nBuf bytes of randomness into zBuf.
*/
static int winRandomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
  int n = 0;
  UNUSED_PARAMETER(pVfs);
#if defined(SQLITE_TEST) || defined(SQLITE_OMIT_RANDOMNESS)
  n = nBuf;
  memset(zBuf, 0, nBuf);

#else

  if( sizeof(SYSTEMTIME)<=nBuf-n ){









    SYSTEMTIME x;
    osGetSystemTime(&x);
    memcpy(&zBuf[n], &x, sizeof(x));
    n += sizeof(x);

  }
  if( sizeof(DWORD)<=nBuf-n ){

    DWORD pid = osGetCurrentProcessId();
    memcpy(&zBuf[n], &pid, sizeof(pid));
    n += sizeof(pid);

  }
#if SQLITE_OS_WINRT
  if( sizeof(ULONGLONG)<=nBuf-n ){

    ULONGLONG cnt = osGetTickCount64();
    memcpy(&zBuf[n], &cnt, sizeof(cnt));
    n += sizeof(cnt);

  }
#else
  if( sizeof(DWORD)<=nBuf-n ){

    DWORD cnt = osGetTickCount();
    memcpy(&zBuf[n], &cnt, sizeof(cnt));
    n += sizeof(cnt);

  }
#endif
  if( sizeof(LARGE_INTEGER)<=nBuf-n ){


    LARGE_INTEGER i;
    osQueryPerformanceCounter(&i);
    memcpy(&zBuf[n], &i, sizeof(i));
    n += sizeof(i);

  }
#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID
  if( sizeof(UUID)<=nBuf-n ){

    UUID id;
    memset(&id, 0, sizeof(UUID));
    osUuidCreate(&id);
    memcpy(&zBuf[n], &id, sizeof(UUID));
    n += sizeof(UUID);
  }
  if( sizeof(UUID)<=nBuf-n ){
    UUID id;
    memset(&id, 0, sizeof(UUID));
    osUuidCreateSequential(&id);
    memcpy(&zBuf[n], &id, sizeof(UUID));
    n += sizeof(UUID);
  }
#endif


#endif /* defined(SQLITE_TEST) || defined(SQLITE_ZERO_PRNG_SEED) */
  return n;
}


/*
** Sleep for a little while.  Return the amount of time slept.
*/
static int winSleep(sqlite3_vfs *pVfs, int microsec){

#endif
#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT
  if( (nLargest=osHeapCompact(hHeap, SQLITE_WIN32_HEAP_FLAGS))==0 ){
    DWORD lastErrno = osGetLastError();
    if( lastErrno==NO_ERROR ){
      sqlite3_log(SQLITE_NOMEM, "failed to HeapCompact (no space), heap=%p",
                  (void*)hHeap);
      rc = SQLITE_NOMEM_BKPT;
    }else{
      sqlite3_log(SQLITE_ERROR, "failed to HeapCompact (%lu), heap=%p",
                  osGetLastError(), (void*)hHeap);
      rc = SQLITE_ERROR;
    }
  }
#else
................................................................................
    pWinMemData->hHeap = osHeapCreate(SQLITE_WIN32_HEAP_FLAGS,
                                      dwInitialSize, dwMaximumSize);
    if( !pWinMemData->hHeap ){
      sqlite3_log(SQLITE_NOMEM,
          "failed to HeapCreate (%lu), flags=%u, initSize=%lu, maxSize=%lu",
          osGetLastError(), SQLITE_WIN32_HEAP_FLAGS, dwInitialSize,
          dwMaximumSize);
      return SQLITE_NOMEM_BKPT;
    }
    pWinMemData->bOwned = TRUE;
    assert( pWinMemData->bOwned );
  }
#else
  pWinMemData->hHeap = osGetProcessHeap();
  if( !pWinMemData->hHeap ){
    sqlite3_log(SQLITE_NOMEM,
        "failed to GetProcessHeap (%lu)", osGetLastError());
    return SQLITE_NOMEM_BKPT;
  }
  pWinMemData->bOwned = FALSE;
  assert( !pWinMemData->bOwned );
#endif
  assert( pWinMemData->hHeap!=0 );
  assert( pWinMemData->hHeap!=INVALID_HANDLE_VALUE );
#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
................................................................................
  );
  assert( !ppDirectory || sqlite3MemdebugHasType(*ppDirectory, MEMTYPE_HEAP) );
  if( ppDirectory ){
    char *zValueUtf8 = 0;
    if( zValue && zValue[0] ){
      zValueUtf8 = winUnicodeToUtf8(zValue);
      if ( zValueUtf8==0 ){
        return SQLITE_NOMEM_BKPT;
      }
    }
    sqlite3_free(*ppDirectory);
    *ppDirectory = zValueUtf8;
    return SQLITE_OK;
  }
  return SQLITE_ERROR;
................................................................................
  DWORD lastErrno;
  BOOL bLogged = FALSE;
  BOOL bInit = TRUE;

  zName = winUtf8ToUnicode(zFilename);
  if( zName==0 ){
    /* out of memory */
    return SQLITE_IOERR_NOMEM_BKPT;
  }

  /* Initialize the local lockdata */
  memset(&pFile->local, 0, sizeof(pFile->local));

  /* Replace the backslashes from the filename and lowercase it
  ** to derive a mutex name. */
................................................................................

  assert( pDbFd->pShm==0 );    /* Not previously opened */

  /* Allocate space for the new sqlite3_shm object.  Also speculatively
  ** allocate space for a new winShmNode and filename.
  */
  p = sqlite3MallocZero( sizeof(*p) );
  if( p==0 ) return SQLITE_IOERR_NOMEM_BKPT;
  nName = sqlite3Strlen30(pDbFd->zPath);
  pNew = sqlite3MallocZero( sizeof(*pShmNode) + nName + 17 );
  if( pNew==0 ){
    sqlite3_free(p);
    return SQLITE_IOERR_NOMEM_BKPT;
  }
  pNew->zFilename = (char*)&pNew[1];
  sqlite3_snprintf(nName+15, pNew->zFilename, "%s-shm", pDbFd->zPath);
  sqlite3FileSuffix3(pDbFd->zPath, pNew->zFilename);

  /* Look to see if there is an existing winShmNode that can be used.
  ** If no matching winShmNode currently exists, create a new one.
................................................................................
    pNew = 0;
    ((winFile*)(&pShmNode->hFile))->h = INVALID_HANDLE_VALUE;
    pShmNode->pNext = winShmNodeList;
    winShmNodeList = pShmNode;

    pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
    if( pShmNode->mutex==0 ){
      rc = SQLITE_IOERR_NOMEM_BKPT;
      goto shm_open_err;
    }

    rc = winOpen(pDbFd->pVfs,
                 pShmNode->zFilename,             /* Name of the file (UTF-8) */
                 (sqlite3_file*)&pShmNode->hFile,  /* File handle here */
                 SQLITE_OPEN_WAL | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
................................................................................
    }

    /* Map the requested memory region into this processes address space. */
    apNew = (struct ShmRegion *)sqlite3_realloc64(
        pShmNode->aRegion, (iRegion+1)*sizeof(apNew[0])
    );
    if( !apNew ){
      rc = SQLITE_IOERR_NOMEM_BKPT;
      goto shmpage_out;
    }
    pShmNode->aRegion = apNew;

    while( pShmNode->nRegion<=iRegion ){
      HANDLE hMap = NULL;         /* file-mapping handle */
      void *pMap = 0;             /* Mapped memory region */
................................................................................
  /* Allocate a temporary buffer to store the fully qualified file
  ** name for the temporary file.  If this fails, we cannot continue.
  */
  nMax = pVfs->mxPathname; nBuf = nMax + 2;
  zBuf = sqlite3MallocZero( nBuf );
  if( !zBuf ){
    OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
    return SQLITE_IOERR_NOMEM_BKPT;
  }

  /* Figure out the effective temporary directory.  First, check if one
  ** has been explicitly set by the application; otherwise, use the one
  ** configured by the operating system.
  */
  nDir = nMax - (nPre + 15);
................................................................................
      ** prior to using it.
      */
      if( winIsDriveLetterAndColon(zDir) ){
        zConverted = winConvertFromUtf8Filename(zDir);
        if( !zConverted ){
          sqlite3_free(zBuf);
          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
          return SQLITE_IOERR_NOMEM_BKPT;
        }
        if( winIsDir(zConverted) ){
          sqlite3_snprintf(nMax, zBuf, "%s", zDir);
          sqlite3_free(zConverted);
          break;
        }
        sqlite3_free(zConverted);
      }else{
        zConverted = sqlite3MallocZero( nMax+1 );
        if( !zConverted ){
          sqlite3_free(zBuf);
          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
          return SQLITE_IOERR_NOMEM_BKPT;
        }
        if( cygwin_conv_path(
                osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A, zDir,
                zConverted, nMax+1)<0 ){
          sqlite3_free(zConverted);
          sqlite3_free(zBuf);
          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_CONVPATH\n"));
................................................................................
          ** its name into UTF-8 (i.e. if it is UTF-16 right now).
          */
          char *zUtf8 = winConvertToUtf8Filename(zConverted);
          if( !zUtf8 ){
            sqlite3_free(zConverted);
            sqlite3_free(zBuf);
            OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
            return SQLITE_IOERR_NOMEM_BKPT;
          }
          sqlite3_snprintf(nMax, zBuf, "%s", zUtf8);
          sqlite3_free(zUtf8);
          sqlite3_free(zConverted);
          break;
        }
        sqlite3_free(zConverted);
................................................................................
#elif !SQLITE_OS_WINRT && !defined(__CYGWIN__)
  else if( osIsNT() ){
    char *zMulti;
    LPWSTR zWidePath = sqlite3MallocZero( nMax*sizeof(WCHAR) );
    if( !zWidePath ){
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM_BKPT;
    }
    if( osGetTempPathW(nMax, zWidePath)==0 ){
      sqlite3_free(zWidePath);
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_GETTEMPPATH\n"));
      return winLogError(SQLITE_IOERR_GETTEMPPATH, osGetLastError(),
                         "winGetTempname2", 0);
................................................................................
      sqlite3_snprintf(nMax, zBuf, "%s", zMulti);
      sqlite3_free(zMulti);
      sqlite3_free(zWidePath);
    }else{
      sqlite3_free(zWidePath);
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM_BKPT;
    }
  }
#ifdef SQLITE_WIN32_HAS_ANSI
  else{
    char *zUtf8;
    char *zMbcsPath = sqlite3MallocZero( nMax );
    if( !zMbcsPath ){
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM_BKPT;
    }
    if( osGetTempPathA(nMax, zMbcsPath)==0 ){
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_GETTEMPPATH\n"));
      return winLogError(SQLITE_IOERR_GETTEMPPATH, osGetLastError(),
                         "winGetTempname3", 0);
    }
................................................................................
    zUtf8 = sqlite3_win32_mbcs_to_utf8(zMbcsPath);
    if( zUtf8 ){
      sqlite3_snprintf(nMax, zBuf, "%s", zUtf8);
      sqlite3_free(zUtf8);
    }else{
      sqlite3_free(zBuf);
      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
      return SQLITE_IOERR_NOMEM_BKPT;
    }
  }
#endif /* SQLITE_WIN32_HAS_ANSI */
#endif /* !SQLITE_OS_WINRT */

  /*
  ** Check to make sure the temporary directory ends with an appropriate
................................................................................
       zUtf8Name[sqlite3Strlen30(zUtf8Name)+1]==0 );

  /* Convert the filename to the system encoding. */
  zConverted = winConvertFromUtf8Filename(zUtf8Name);
  if( zConverted==0 ){
    sqlite3_free(zTmpname);
    OSTRACE(("OPEN name=%s, rc=SQLITE_IOERR_NOMEM", zUtf8Name));
    return SQLITE_IOERR_NOMEM_BKPT;
  }

  if( winIsDir(zConverted) ){
    sqlite3_free(zConverted);
    sqlite3_free(zTmpname);
    OSTRACE(("OPEN name=%s, rc=SQLITE_CANTOPEN_ISDIR", zUtf8Name));
    return SQLITE_CANTOPEN_ISDIR;
................................................................................

  SimulateIOError(return SQLITE_IOERR_DELETE);
  OSTRACE(("DELETE name=%s, syncDir=%d\n", zFilename, syncDir));

  zConverted = winConvertFromUtf8Filename(zFilename);
  if( zConverted==0 ){
    OSTRACE(("DELETE name=%s, rc=SQLITE_IOERR_NOMEM\n", zFilename));
    return SQLITE_IOERR_NOMEM_BKPT;
  }
  if( osIsNT() ){
    do {
#if SQLITE_OS_WINRT
      WIN32_FILE_ATTRIBUTE_DATA sAttrData;
      memset(&sAttrData, 0, sizeof(sAttrData));
      if ( osGetFileAttributesExW(zConverted, GetFileExInfoStandard,
................................................................................
  SimulateIOError( return SQLITE_IOERR_ACCESS; );
  OSTRACE(("ACCESS name=%s, flags=%x, pResOut=%p\n",
           zFilename, flags, pResOut));

  zConverted = winConvertFromUtf8Filename(zFilename);
  if( zConverted==0 ){
    OSTRACE(("ACCESS name=%s, rc=SQLITE_IOERR_NOMEM\n", zFilename));
    return SQLITE_IOERR_NOMEM_BKPT;
  }
  if( osIsNT() ){
    int cnt = 0;
    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
    memset(&sAttrData, 0, sizeof(sAttrData));
    while( !(rc = osGetFileAttributesExW((LPCWSTR)zConverted,
                             GetFileExInfoStandard,
................................................................................
    ** NOTE: We are dealing with a relative path name and the data
    **       directory has been set.  Therefore, use it as the basis
    **       for converting the relative path name to an absolute
    **       one by prepending the data directory and a slash.
    */
    char *zOut = sqlite3MallocZero( pVfs->mxPathname+1 );
    if( !zOut ){
      return SQLITE_IOERR_NOMEM_BKPT;
    }
    if( cygwin_conv_path(
            (osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A) |
            CCP_RELATIVE, zRelative, zOut, pVfs->mxPathname+1)<0 ){
      sqlite3_free(zOut);
      return winLogError(SQLITE_CANTOPEN_CONVPATH, (DWORD)errno,
                         "winFullPathname1", zRelative);
    }else{
      char *zUtf8 = winConvertToUtf8Filename(zOut);
      if( !zUtf8 ){
        sqlite3_free(zOut);
        return SQLITE_IOERR_NOMEM_BKPT;
      }
      sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s%c%s",
                       sqlite3_data_directory, winGetDirSep(), zUtf8);
      sqlite3_free(zUtf8);
      sqlite3_free(zOut);
    }
  }else{
    char *zOut = sqlite3MallocZero( pVfs->mxPathname+1 );
    if( !zOut ){
      return SQLITE_IOERR_NOMEM_BKPT;
    }
    if( cygwin_conv_path(
            (osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A),
            zRelative, zOut, pVfs->mxPathname+1)<0 ){
      sqlite3_free(zOut);
      return winLogError(SQLITE_CANTOPEN_CONVPATH, (DWORD)errno,
                         "winFullPathname2", zRelative);
    }else{
      char *zUtf8 = winConvertToUtf8Filename(zOut);
      if( !zUtf8 ){
        sqlite3_free(zOut);
        return SQLITE_IOERR_NOMEM_BKPT;
      }
      sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s", zUtf8);
      sqlite3_free(zUtf8);
      sqlite3_free(zOut);
    }
  }
  return SQLITE_OK;
................................................................................
    */
    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s%c%s",
                     sqlite3_data_directory, winGetDirSep(), zRelative);
    return SQLITE_OK;
  }
  zConverted = winConvertFromUtf8Filename(zRelative);
  if( zConverted==0 ){
    return SQLITE_IOERR_NOMEM_BKPT;
  }
  if( osIsNT() ){
    LPWSTR zTemp;
    nByte = osGetFullPathNameW((LPCWSTR)zConverted, 0, 0, 0);
    if( nByte==0 ){
      sqlite3_free(zConverted);
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname1", zRelative);
    }
    nByte += 3;
    zTemp = sqlite3MallocZero( nByte*sizeof(zTemp[0]) );
    if( zTemp==0 ){
      sqlite3_free(zConverted);
      return SQLITE_IOERR_NOMEM_BKPT;
    }
    nByte = osGetFullPathNameW((LPCWSTR)zConverted, nByte, zTemp, 0);
    if( nByte==0 ){
      sqlite3_free(zConverted);
      sqlite3_free(zTemp);
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname2", zRelative);
................................................................................
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname3", zRelative);
    }
    nByte += 3;
    zTemp = sqlite3MallocZero( nByte*sizeof(zTemp[0]) );
    if( zTemp==0 ){
      sqlite3_free(zConverted);
      return SQLITE_IOERR_NOMEM_BKPT;
    }
    nByte = osGetFullPathNameA((char*)zConverted, nByte, zTemp, 0);
    if( nByte==0 ){
      sqlite3_free(zConverted);
      sqlite3_free(zTemp);
      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
                         "winFullPathname4", zRelative);
................................................................................
  }
#endif
  if( zOut ){
    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s", zOut);
    sqlite3_free(zOut);
    return SQLITE_OK;
  }else{
    return SQLITE_IOERR_NOMEM_BKPT;
  }
#endif
}

#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Interfaces for opening a shared library, finding entry points
................................................................................
#else /* if SQLITE_OMIT_LOAD_EXTENSION is defined: */
  #define winDlOpen  0
  #define winDlError 0
  #define winDlSym   0
  #define winDlClose 0
#endif

/* State information for the randomness gatherer. */
typedef struct EntropyGatherer EntropyGatherer;
struct EntropyGatherer {
  unsigned char *a;   /* Gather entropy into this buffer */
  int na;             /* Size of a[] in bytes */
  int i;              /* XOR next input into a[i] */
  int nXor;           /* Number of XOR operations done */
};

#if !defined(SQLITE_TEST) && !defined(SQLITE_OMIT_RANDOMNESS)
/* Mix sz bytes of entropy into p. */
static void xorMemory(EntropyGatherer *p, unsigned char *x, int sz){
  int j, k;
  for(j=0, k=p->i; j<sz; j++){
    p->a[k++] ^= x[j];
    if( k>=p->na ) k = 0;
  }
  p->i = k;
  p->nXor += sz;
}
#endif /* !defined(SQLITE_TEST) && !defined(SQLITE_OMIT_RANDOMNESS) */

/*
** Write up to nBuf bytes of randomness into zBuf.
*/
static int winRandomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
#if defined(SQLITE_TEST) || defined(SQLITE_OMIT_RANDOMNESS)
  UNUSED_PARAMETER(pVfs);


  memset(zBuf, 0, nBuf);
  return nBuf;
#else
  EntropyGatherer e;
  UNUSED_PARAMETER(pVfs);
  memset(zBuf, 0, nBuf);
#if defined(_MSC_VER) && _MSC_VER>=1400
  rand_s((int*)zBuf); /* rand_s() is not available with MinGW */
#endif /* defined(_MSC_VER) && _MSC_VER>=1400 */
  e.a = (unsigned char*)zBuf;
  e.na = nBuf;
  e.nXor = 0;
  e.i = 0;
  {
    SYSTEMTIME x;
    osGetSystemTime(&x);


    xorMemory(&e, (unsigned char*)&x, sizeof(SYSTEMTIME));
  }

  {
    DWORD pid = osGetCurrentProcessId();


    xorMemory(&e, (unsigned char*)&pid, sizeof(DWORD));
  }
#if SQLITE_OS_WINRT

  {
    ULONGLONG cnt = osGetTickCount64();


    xorMemory(&e, (unsigned char*)&cnt, sizeof(ULONGLONG));
  }
#else

  {
    DWORD cnt = osGetTickCount();


    xorMemory(&e, (unsigned char*)&cnt, sizeof(DWORD));
  }


#endif /* SQLITE_OS_WINRT */
  {
    LARGE_INTEGER i;
    osQueryPerformanceCounter(&i);


    xorMemory(&e, (unsigned char*)&i, sizeof(LARGE_INTEGER));
  }
#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID

  {
    UUID id;
    memset(&id, 0, sizeof(UUID));
    osUuidCreate(&id);

    xorMemory(&e, (unsigned char*)&id, sizeof(UUID));



    memset(&id, 0, sizeof(UUID));
    osUuidCreateSequential(&id);

    xorMemory(&e, (unsigned char*)&id, sizeof(UUID));
  }

#endif /* !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID */
  return e.nXor>nBuf ? nBuf : e.nXor;
#endif /* defined(SQLITE_TEST) || defined(SQLITE_OMIT_RANDOMNESS) */

}


/*
** Sleep for a little while.  Return the amount of time slept.
*/
static int winSleep(sqlite3_vfs *pVfs, int microsec){

    testcase( !isSavepnt && pPg!=0 && (pPg->flags&PGHDR_NEED_SYNC)!=0 );
    assert( !pagerUseWal(pPager) );
    rc = sqlite3OsWrite(pPager->fd, (u8 *)aData, pPager->pageSize, ofst);
    if( pgno>pPager->dbFileSize ){
      pPager->dbFileSize = pgno;
    }
    if( pPager->pBackup ){
      CODEC1(pPager, aData, pgno, 3, rc=SQLITE_NOMEM);
      sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
      CODEC2(pPager, aData, pgno, 7, rc=SQLITE_NOMEM, aData);
    }
  }else if( !isMainJrnl && pPg==0 ){
    /* If this is a rollback of a savepoint and data was not written to
    ** the database and the page is not in-memory, there is a potential
    ** problem. When the page is next fetched by the b-tree layer, it 
    ** will be read from the database file, which may or may not be 
    ** current. 
................................................................................
    /* If this was page 1, then restore the value of Pager.dbFileVers.
    ** Do this before any decoding. */
    if( pgno==1 ){
      memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
    }

    /* Decode the page just read from disk */
    CODEC1(pPager, pData, pPg->pgno, 3, rc=SQLITE_NOMEM);
    sqlite3PcacheRelease(pPg);
  }
  return rc;
}

/*
** Parameter zMaster is the name of a master journal file. A single journal
................................................................................

  /* Allocate space for both the pJournal and pMaster file descriptors.
  ** If successful, open the master journal file for reading.
  */
  pMaster = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile * 2);
  pJournal = (sqlite3_file *)(((u8 *)pMaster) + pVfs->szOsFile);
  if( !pMaster ){
    rc = SQLITE_NOMEM;
  }else{
    const int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_MASTER_JOURNAL);
    rc = sqlite3OsOpen(pVfs, zMaster, pMaster, flags, 0);
  }
  if( rc!=SQLITE_OK ) goto delmaster_out;

  /* Load the entire master journal file into space obtained from
................................................................................
  ** journal files extracted from regular rollback-journals.
  */
  rc = sqlite3OsFileSize(pMaster, &nMasterJournal);
  if( rc!=SQLITE_OK ) goto delmaster_out;
  nMasterPtr = pVfs->mxPathname+1;
  zMasterJournal = sqlite3Malloc(nMasterJournal + nMasterPtr + 1);
  if( !zMasterJournal ){
    rc = SQLITE_NOMEM;
    goto delmaster_out;
  }
  zMasterPtr = &zMasterJournal[nMasterJournal+1];
  rc = sqlite3OsRead(pMaster, zMasterJournal, (int)nMasterJournal, 0);
  if( rc!=SQLITE_OK ) goto delmaster_out;
  zMasterJournal[nMasterJournal] = 0;

................................................................................
      */
      memset(pPager->dbFileVers, 0xff, sizeof(pPager->dbFileVers));
    }else{
      u8 *dbFileVers = &((u8*)pPg->pData)[24];
      memcpy(&pPager->dbFileVers, dbFileVers, sizeof(pPager->dbFileVers));
    }
  }
  CODEC1(pPager, pPg->pData, pgno, 3, rc = SQLITE_NOMEM);

  PAGER_INCR(sqlite3_pager_readdb_count);
  PAGER_INCR(pPager->nRead);
  IOTRACE(("PGIN %p %d\n", pPager, pgno));
  PAGERTRACE(("FETCH %d page %d hash(%08x)\n",
               PAGERID(pPager), pgno, pager_pagehash(pPg)));

................................................................................
  assert( pPager->eState!=PAGER_ERROR );
  assert( pPager->eState>=PAGER_WRITER_LOCKED );

  /* Allocate a bitvec to use to store the set of pages rolled back */
  if( pSavepoint ){
    pDone = sqlite3BitvecCreate(pSavepoint->nOrig);
    if( !pDone ){
      return SQLITE_NOMEM;
    }
  }

  /* Set the database size back to the value it was before the savepoint 
  ** being reverted was opened.
  */
  pPager->dbSize = pSavepoint ? pSavepoint->nOrig : pPager->dbOrigSize;
................................................................................
    i64 nByte = 0;

    if( pPager->eState>PAGER_OPEN && isOpen(pPager->fd) ){
      rc = sqlite3OsFileSize(pPager->fd, &nByte);
    }
    if( rc==SQLITE_OK ){
      pNew = (char *)sqlite3PageMalloc(pageSize);
      if( !pNew ) rc = SQLITE_NOMEM;
    }

    if( rc==SQLITE_OK ){
      pager_reset(pPager);
      rc = sqlite3PcacheSetPageSize(pPager->pPCache, pageSize);
    }
    if( rc==SQLITE_OK ){
................................................................................
    pPager->pMmapFreelist = p->pDirty;
    p->pDirty = 0;
    memset(p->pExtra, 0, pPager->nExtra);
  }else{
    *ppPage = p = (PgHdr *)sqlite3MallocZero(sizeof(PgHdr) + pPager->nExtra);
    if( p==0 ){
      sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1) * pPager->pageSize, pData);
      return SQLITE_NOMEM;
    }
    p->pExtra = (void *)&p[1];
    p->flags = PGHDR_MMAP;
    p->nRef = 1;
    p->pPager = pPager;
  }

................................................................................
      i64 offset = (pgno-1)*(i64)pPager->pageSize;   /* Offset to write */
      char *pData;                                   /* Data to write */    

      assert( (pList->flags&PGHDR_NEED_SYNC)==0 );
      if( pList->pgno==1 ) pager_write_changecounter(pList);

      /* Encode the database */
      CODEC2(pPager, pList->pData, pgno, 6, return SQLITE_NOMEM, pData);

      /* Write out the page data. */
      rc = sqlite3OsWrite(pPager->fd, pData, pPager->pageSize, offset);

      /* If page 1 was just written, update Pager.dbFileVers to match
      ** the value now stored in the database file. If writing this 
      ** page caused the database file to grow, update dbFileSize. 
................................................................................
    /* If the sub-journal was opened successfully (or was already open),
    ** write the journal record into the file.  */
    if( rc==SQLITE_OK ){
      void *pData = pPg->pData;
      i64 offset = (i64)pPager->nSubRec*(4+pPager->pageSize);
      char *pData2;
  
      CODEC2(pPager, pData, pPg->pgno, 7, return SQLITE_NOMEM, pData2);
      PAGERTRACE(("STMT-JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno));
      rc = write32bits(pPager->sjfd, offset, pPg->pgno);
      if( rc==SQLITE_OK ){
        rc = sqlite3OsWrite(pPager->sjfd, pData2, pPager->pageSize, offset+4);
      }
    }
  }
................................................................................
  *ppPager = 0;

#ifndef SQLITE_OMIT_MEMORYDB
  if( flags & PAGER_MEMORY ){
    memDb = 1;
    if( zFilename && zFilename[0] ){
      zPathname = sqlite3DbStrDup(0, zFilename);
      if( zPathname==0  ) return SQLITE_NOMEM;
      nPathname = sqlite3Strlen30(zPathname);
      zFilename = 0;
    }
  }
#endif

  /* Compute and store the full pathname in an allocated buffer pointed
................................................................................
  ** leave both nPathname and zPathname set to 0.
  */
  if( zFilename && zFilename[0] ){
    const char *z;
    nPathname = pVfs->mxPathname+1;
    zPathname = sqlite3DbMallocRaw(0, nPathname*2);
    if( zPathname==0 ){
      return SQLITE_NOMEM;
    }
    zPathname[0] = 0; /* Make sure initialized even if FullPathname() fails */
    rc = sqlite3OsFullPathname(pVfs, zFilename, nPathname, zPathname);
    nPathname = sqlite3Strlen30(zPathname);
    z = zUri = &zFilename[sqlite3Strlen30(zFilename)+1];
    while( *z ){
      z += sqlite3Strlen30(z)+1;
................................................................................
#ifndef SQLITE_OMIT_WAL
    + nPathname + 4 + 2            /* zWal */
#endif
  );
  assert( EIGHT_BYTE_ALIGNMENT(SQLITE_INT_TO_PTR(journalFileSize)) );
  if( !pPtr ){
    sqlite3DbFree(0, zPathname);
    return SQLITE_NOMEM;
  }
  pPager =              (Pager*)(pPtr);
  pPager->pPCache =    (PCache*)(pPtr += ROUND8(sizeof(*pPager)));
  pPager->fd =   (sqlite3_file*)(pPtr += ROUND8(pcacheSize));
  pPager->sjfd = (sqlite3_file*)(pPtr += ROUND8(pVfs->szOsFile));
  pPager->jfd =  (sqlite3_file*)(pPtr += journalFileSize);
  pPager->zFilename =    (char*)(pPtr += journalFileSize);
................................................................................
      sqlite3_pcache_page *pBase;
      pBase = sqlite3PcacheFetch(pPager->pPCache, pgno, 3);
      if( pBase==0 ){
        rc = sqlite3PcacheFetchStress(pPager->pPCache, pgno, &pBase);
        if( rc!=SQLITE_OK ) goto pager_acquire_err;
        if( pBase==0 ){
          pPg = *ppPage = 0;
          rc = SQLITE_NOMEM;
          goto pager_acquire_err;
        }
      }
      pPg = *ppPage = sqlite3PcacheFetchFinish(pPager->pPCache, pgno, pBase);
      assert( pPg!=0 );
    }
  }
................................................................................
  ** the other hand, this routine is never called if we are already in
  ** an error state. */
  if( NEVER(pPager->errCode) ) return pPager->errCode;

  if( !pagerUseWal(pPager) && pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
    pPager->pInJournal = sqlite3BitvecCreate(pPager->dbSize);
    if( pPager->pInJournal==0 ){
      return SQLITE_NOMEM;
    }
  
    /* Open the journal file if it is not already open. */
    if( !isOpen(pPager->jfd) ){
      if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ){
        sqlite3MemJournalOpen(pPager->jfd);
      }else{
................................................................................

  /* We should never write to the journal file the page that
  ** contains the database locks.  The following assert verifies
  ** that we do not. */
  assert( pPg->pgno!=PAGER_MJ_PGNO(pPager) );

  assert( pPager->journalHdr<=pPager->journalOff );
  CODEC2(pPager, pPg->pData, pPg->pgno, 7, return SQLITE_NOMEM, pData2);
  cksum = pager_cksum(pPager, (u8*)pData2);

  /* Even if an IO or diskfull error occurs while journalling the
  ** page in the block above, set the need-sync flag for the page.
  ** Otherwise, when the transaction is rolled back, the logic in
  ** playback_one_page() will think that the page needs to be restored
  ** in the database file. And if an IO error occurs while doing so,
................................................................................
      /* Actually do the update of the change counter */
      pager_write_changecounter(pPgHdr);

      /* If running in direct mode, write the contents of page 1 to the file. */
      if( DIRECT_MODE ){
        const void *zBuf;
        assert( pPager->dbFileSize>0 );
        CODEC2(pPager, pPgHdr->pData, 1, 6, rc=SQLITE_NOMEM, zBuf);
        if( rc==SQLITE_OK ){
          rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
          pPager->aStat[PAGER_STAT_WRITE]++;
        }
        if( rc==SQLITE_OK ){
          /* Update the pager's copy of the change-counter. Otherwise, the
          ** next time a read transaction is opened the cache will be
................................................................................
  ** if the allocation fails. Otherwise, zero the new portion in case a 
  ** malloc failure occurs while populating it in the for(...) loop below.
  */
  aNew = (PagerSavepoint *)sqlite3Realloc(
      pPager->aSavepoint, sizeof(PagerSavepoint)*nSavepoint
  );
  if( !aNew ){
    return SQLITE_NOMEM;
  }
  memset(&aNew[nCurrent], 0, (nSavepoint-nCurrent) * sizeof(PagerSavepoint));
  pPager->aSavepoint = aNew;

  /* Populate the PagerSavepoint structures just allocated. */
  for(ii=nCurrent; ii<nSavepoint; ii++){
    aNew[ii].nOrig = pPager->dbSize;
................................................................................
      aNew[ii].iOffset = pPager->journalOff;
    }else{
      aNew[ii].iOffset = JOURNAL_HDR_SZ(pPager);
    }
    aNew[ii].iSubRec = pPager->nSubRec;
    aNew[ii].pInSavepoint = sqlite3BitvecCreate(pPager->dbSize);
    if( !aNew[ii].pInSavepoint ){
      return SQLITE_NOMEM;
    }
    if( pagerUseWal(pPager) ){
      sqlite3WalSavepoint(pPager->pWal, aNew[ii].aWalData);
    }
    pPager->nSavepoint = ii+1;
  }
  assert( pPager->nSavepoint==nSavepoint );
................................................................................
/*
** Return the full pathname of the journal file.
*/
const char *sqlite3PagerJournalname(Pager *pPager){
  return pPager->zJournal;
}

/*
** Return true if fsync() calls are disabled for this pager.  Return FALSE
** if fsync()s are executed normally.
*/
int sqlite3PagerNosync(Pager *pPager){
  return pPager->noSync;
}

#ifdef SQLITE_HAS_CODEC
/*
** Set or retrieve the codec for this pager
*/
void sqlite3PagerSetCodec(
  Pager *pPager,
  void *(*xCodec)(void*,void*,Pgno,int),

    testcase( !isSavepnt && pPg!=0 && (pPg->flags&PGHDR_NEED_SYNC)!=0 );
    assert( !pagerUseWal(pPager) );
    rc = sqlite3OsWrite(pPager->fd, (u8 *)aData, pPager->pageSize, ofst);
    if( pgno>pPager->dbFileSize ){
      pPager->dbFileSize = pgno;
    }
    if( pPager->pBackup ){
      CODEC1(pPager, aData, pgno, 3, rc=SQLITE_NOMEM_BKPT);
      sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
      CODEC2(pPager, aData, pgno, 7, rc=SQLITE_NOMEM_BKPT, aData);
    }
  }else if( !isMainJrnl && pPg==0 ){
    /* If this is a rollback of a savepoint and data was not written to
    ** the database and the page is not in-memory, there is a potential
    ** problem. When the page is next fetched by the b-tree layer, it 
    ** will be read from the database file, which may or may not be 
    ** current. 
................................................................................
    /* If this was page 1, then restore the value of Pager.dbFileVers.
    ** Do this before any decoding. */
    if( pgno==1 ){
      memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
    }

    /* Decode the page just read from disk */
    CODEC1(pPager, pData, pPg->pgno, 3, rc=SQLITE_NOMEM_BKPT);
    sqlite3PcacheRelease(pPg);
  }
  return rc;
}

/*
** Parameter zMaster is the name of a master journal file. A single journal
................................................................................

  /* Allocate space for both the pJournal and pMaster file descriptors.
  ** If successful, open the master journal file for reading.
  */
  pMaster = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile * 2);
  pJournal = (sqlite3_file *)(((u8 *)pMaster) + pVfs->szOsFile);
  if( !pMaster ){
    rc = SQLITE_NOMEM_BKPT;
  }else{
    const int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_MASTER_JOURNAL);
    rc = sqlite3OsOpen(pVfs, zMaster, pMaster, flags, 0);
  }
  if( rc!=SQLITE_OK ) goto delmaster_out;

  /* Load the entire master journal file into space obtained from
................................................................................
  ** journal files extracted from regular rollback-journals.
  */
  rc = sqlite3OsFileSize(pMaster, &nMasterJournal);
  if( rc!=SQLITE_OK ) goto delmaster_out;
  nMasterPtr = pVfs->mxPathname+1;
  zMasterJournal = sqlite3Malloc(nMasterJournal + nMasterPtr + 1);
  if( !zMasterJournal ){
    rc = SQLITE_NOMEM_BKPT;
    goto delmaster_out;
  }
  zMasterPtr = &zMasterJournal[nMasterJournal+1];
  rc = sqlite3OsRead(pMaster, zMasterJournal, (int)nMasterJournal, 0);
  if( rc!=SQLITE_OK ) goto delmaster_out;
  zMasterJournal[nMasterJournal] = 0;

................................................................................
      */
      memset(pPager->dbFileVers, 0xff, sizeof(pPager->dbFileVers));
    }else{
      u8 *dbFileVers = &((u8*)pPg->pData)[24];
      memcpy(&pPager->dbFileVers, dbFileVers, sizeof(pPager->dbFileVers));
    }
  }
  CODEC1(pPager, pPg->pData, pgno, 3, rc = SQLITE_NOMEM_BKPT);

  PAGER_INCR(sqlite3_pager_readdb_count);
  PAGER_INCR(pPager->nRead);
  IOTRACE(("PGIN %p %d\n", pPager, pgno));
  PAGERTRACE(("FETCH %d page %d hash(%08x)\n",
               PAGERID(pPager), pgno, pager_pagehash(pPg)));

................................................................................
  assert( pPager->eState!=PAGER_ERROR );
  assert( pPager->eState>=PAGER_WRITER_LOCKED );

  /* Allocate a bitvec to use to store the set of pages rolled back */
  if( pSavepoint ){
    pDone = sqlite3BitvecCreate(pSavepoint->nOrig);
    if( !pDone ){
      return SQLITE_NOMEM_BKPT;
    }
  }

  /* Set the database size back to the value it was before the savepoint 
  ** being reverted was opened.
  */
  pPager->dbSize = pSavepoint ? pSavepoint->nOrig : pPager->dbOrigSize;
................................................................................
    i64 nByte = 0;

    if( pPager->eState>PAGER_OPEN && isOpen(pPager->fd) ){
      rc = sqlite3OsFileSize(pPager->fd, &nByte);
    }
    if( rc==SQLITE_OK ){
      pNew = (char *)sqlite3PageMalloc(pageSize);
      if( !pNew ) rc = SQLITE_NOMEM_BKPT;
    }

    if( rc==SQLITE_OK ){
      pager_reset(pPager);
      rc = sqlite3PcacheSetPageSize(pPager->pPCache, pageSize);
    }
    if( rc==SQLITE_OK ){
................................................................................
    pPager->pMmapFreelist = p->pDirty;
    p->pDirty = 0;
    memset(p->pExtra, 0, pPager->nExtra);
  }else{
    *ppPage = p = (PgHdr *)sqlite3MallocZero(sizeof(PgHdr) + pPager->nExtra);
    if( p==0 ){
      sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1) * pPager->pageSize, pData);
      return SQLITE_NOMEM_BKPT;
    }
    p->pExtra = (void *)&p[1];
    p->flags = PGHDR_MMAP;
    p->nRef = 1;
    p->pPager = pPager;
  }

................................................................................
      i64 offset = (pgno-1)*(i64)pPager->pageSize;   /* Offset to write */
      char *pData;                                   /* Data to write */    

      assert( (pList->flags&PGHDR_NEED_SYNC)==0 );
      if( pList->pgno==1 ) pager_write_changecounter(pList);

      /* Encode the database */
      CODEC2(pPager, pList->pData, pgno, 6, return SQLITE_NOMEM_BKPT, pData);

      /* Write out the page data. */
      rc = sqlite3OsWrite(pPager->fd, pData, pPager->pageSize, offset);

      /* If page 1 was just written, update Pager.dbFileVers to match
      ** the value now stored in the database file. If writing this 
      ** page caused the database file to grow, update dbFileSize. 
................................................................................
    /* If the sub-journal was opened successfully (or was already open),
    ** write the journal record into the file.  */
    if( rc==SQLITE_OK ){
      void *pData = pPg->pData;
      i64 offset = (i64)pPager->nSubRec*(4+pPager->pageSize);
      char *pData2;
  
      CODEC2(pPager, pData, pPg->pgno, 7, return SQLITE_NOMEM_BKPT, pData2);
      PAGERTRACE(("STMT-JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno));
      rc = write32bits(pPager->sjfd, offset, pPg->pgno);
      if( rc==SQLITE_OK ){
        rc = sqlite3OsWrite(pPager->sjfd, pData2, pPager->pageSize, offset+4);
      }
    }
  }
................................................................................
  *ppPager = 0;

#ifndef SQLITE_OMIT_MEMORYDB
  if( flags & PAGER_MEMORY ){
    memDb = 1;
    if( zFilename && zFilename[0] ){
      zPathname = sqlite3DbStrDup(0, zFilename);
      if( zPathname==0  ) return SQLITE_NOMEM_BKPT;
      nPathname = sqlite3Strlen30(zPathname);
      zFilename = 0;
    }
  }
#endif

  /* Compute and store the full pathname in an allocated buffer pointed
................................................................................
  ** leave both nPathname and zPathname set to 0.
  */
  if( zFilename && zFilename[0] ){
    const char *z;
    nPathname = pVfs->mxPathname+1;
    zPathname = sqlite3DbMallocRaw(0, nPathname*2);
    if( zPathname==0 ){
      return SQLITE_NOMEM_BKPT;
    }
    zPathname[0] = 0; /* Make sure initialized even if FullPathname() fails */
    rc = sqlite3OsFullPathname(pVfs, zFilename, nPathname, zPathname);
    nPathname = sqlite3Strlen30(zPathname);
    z = zUri = &zFilename[sqlite3Strlen30(zFilename)+1];
    while( *z ){
      z += sqlite3Strlen30(z)+1;
................................................................................
#ifndef SQLITE_OMIT_WAL
    + nPathname + 4 + 2            /* zWal */
#endif
  );
  assert( EIGHT_BYTE_ALIGNMENT(SQLITE_INT_TO_PTR(journalFileSize)) );
  if( !pPtr ){
    sqlite3DbFree(0, zPathname);
    return SQLITE_NOMEM_BKPT;
  }
  pPager =              (Pager*)(pPtr);
  pPager->pPCache =    (PCache*)(pPtr += ROUND8(sizeof(*pPager)));
  pPager->fd =   (sqlite3_file*)(pPtr += ROUND8(pcacheSize));
  pPager->sjfd = (sqlite3_file*)(pPtr += ROUND8(pVfs->szOsFile));
  pPager->jfd =  (sqlite3_file*)(pPtr += journalFileSize);
  pPager->zFilename =    (char*)(pPtr += journalFileSize);
................................................................................
      sqlite3_pcache_page *pBase;
      pBase = sqlite3PcacheFetch(pPager->pPCache, pgno, 3);
      if( pBase==0 ){
        rc = sqlite3PcacheFetchStress(pPager->pPCache, pgno, &pBase);
        if( rc!=SQLITE_OK ) goto pager_acquire_err;
        if( pBase==0 ){
          pPg = *ppPage = 0;
          rc = SQLITE_NOMEM_BKPT;
          goto pager_acquire_err;
        }
      }
      pPg = *ppPage = sqlite3PcacheFetchFinish(pPager->pPCache, pgno, pBase);
      assert( pPg!=0 );
    }
  }
................................................................................
  ** the other hand, this routine is never called if we are already in
  ** an error state. */
  if( NEVER(pPager->errCode) ) return pPager->errCode;

  if( !pagerUseWal(pPager) && pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
    pPager->pInJournal = sqlite3BitvecCreate(pPager->dbSize);
    if( pPager->pInJournal==0 ){
      return SQLITE_NOMEM_BKPT;
    }
  
    /* Open the journal file if it is not already open. */
    if( !isOpen(pPager->jfd) ){
      if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ){
        sqlite3MemJournalOpen(pPager->jfd);
      }else{
................................................................................

  /* We should never write to the journal file the page that
  ** contains the database locks.  The following assert verifies
  ** that we do not. */
  assert( pPg->pgno!=PAGER_MJ_PGNO(pPager) );

  assert( pPager->journalHdr<=pPager->journalOff );
  CODEC2(pPager, pPg->pData, pPg->pgno, 7, return SQLITE_NOMEM_BKPT, pData2);
  cksum = pager_cksum(pPager, (u8*)pData2);

  /* Even if an IO or diskfull error occurs while journalling the
  ** page in the block above, set the need-sync flag for the page.
  ** Otherwise, when the transaction is rolled back, the logic in
  ** playback_one_page() will think that the page needs to be restored
  ** in the database file. And if an IO error occurs while doing so,
................................................................................
      /* Actually do the update of the change counter */
      pager_write_changecounter(pPgHdr);

      /* If running in direct mode, write the contents of page 1 to the file. */
      if( DIRECT_MODE ){
        const void *zBuf;
        assert( pPager->dbFileSize>0 );
        CODEC2(pPager, pPgHdr->pData, 1, 6, rc=SQLITE_NOMEM_BKPT, zBuf);
        if( rc==SQLITE_OK ){
          rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
          pPager->aStat[PAGER_STAT_WRITE]++;
        }
        if( rc==SQLITE_OK ){
          /* Update the pager's copy of the change-counter. Otherwise, the
          ** next time a read transaction is opened the cache will be
................................................................................
  ** if the allocation fails. Otherwise, zero the new portion in case a 
  ** malloc failure occurs while populating it in the for(...) loop below.
  */
  aNew = (PagerSavepoint *)sqlite3Realloc(
      pPager->aSavepoint, sizeof(PagerSavepoint)*nSavepoint
  );
  if( !aNew ){
    return SQLITE_NOMEM_BKPT;
  }
  memset(&aNew[nCurrent], 0, (nSavepoint-nCurrent) * sizeof(PagerSavepoint));
  pPager->aSavepoint = aNew;

  /* Populate the PagerSavepoint structures just allocated. */
  for(ii=nCurrent; ii<nSavepoint; ii++){
    aNew[ii].nOrig = pPager->dbSize;
................................................................................
      aNew[ii].iOffset = pPager->journalOff;
    }else{
      aNew[ii].iOffset = JOURNAL_HDR_SZ(pPager);
    }
    aNew[ii].iSubRec = pPager->nSubRec;
    aNew[ii].pInSavepoint = sqlite3BitvecCreate(pPager->dbSize);
    if( !aNew[ii].pInSavepoint ){
      return SQLITE_NOMEM_BKPT;
    }
    if( pagerUseWal(pPager) ){
      sqlite3WalSavepoint(pPager->pWal, aNew[ii].aWalData);
    }
    pPager->nSavepoint = ii+1;
  }
  assert( pPager->nSavepoint==nSavepoint );
................................................................................
/*
** Return the full pathname of the journal file.
*/
const char *sqlite3PagerJournalname(Pager *pPager){
  return pPager->zJournal;
}









#ifdef SQLITE_HAS_CODEC
/*
** Set or retrieve the codec for this pager
*/
void sqlite3PagerSetCodec(
  Pager *pPager,
  void *(*xCodec)(void*,void*,Pgno,int),

#endif
int sqlite3PagerMemUsed(Pager*);
const char *sqlite3PagerFilename(Pager*, int);
sqlite3_vfs *sqlite3PagerVfs(Pager*);
sqlite3_file *sqlite3PagerFile(Pager*);
sqlite3_file *sqlite3PagerJrnlFile(Pager*);
const char *sqlite3PagerJournalname(Pager*);
int sqlite3PagerNosync(Pager*);
void *sqlite3PagerTempSpace(Pager*);
int sqlite3PagerIsMemdb(Pager*);
void sqlite3PagerCacheStat(Pager *, int, int, int *);
void sqlite3PagerClearCache(Pager *);
int sqlite3SectorSize(sqlite3_file *);

/* Functions used to truncate the database file. */

#endif
int sqlite3PagerMemUsed(Pager*);
const char *sqlite3PagerFilename(Pager*, int);
sqlite3_vfs *sqlite3PagerVfs(Pager*);
sqlite3_file *sqlite3PagerFile(Pager*);
sqlite3_file *sqlite3PagerJrnlFile(Pager*);
const char *sqlite3PagerJournalname(Pager*);

void *sqlite3PagerTempSpace(Pager*);
int sqlite3PagerIsMemdb(Pager*);
void sqlite3PagerCacheStat(Pager *, int, int, int *);
void sqlite3PagerClearCache(Pager *);
int sqlite3SectorSize(sqlite3_file *);

/* Functions used to truncate the database file. */

//
%syntax_error {
  UNUSED_PARAMETER(yymajor);  /* Silence some compiler warnings */
  assert( TOKEN.z[0] );  /* The tokenizer always gives us a token */
  sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &TOKEN);
}
%stack_overflow {
  UNUSED_PARAMETER(yypMinor); /* Silence some compiler warnings */
  sqlite3ErrorMsg(pParse, "parser stack overflow");
}

// The name of the generated procedure that implements the parser
// is as follows:
%name sqlite3Parser

................................................................................

cmd ::= BEGIN transtype(Y) trans_opt.  {sqlite3BeginTransaction(pParse, Y);}
trans_opt ::= .
trans_opt ::= TRANSACTION.
trans_opt ::= TRANSACTION nm.
%type transtype {int}
transtype(A) ::= .             {A = TK_DEFERRED;}
transtype(A) ::= DEFERRED(X).  {A = @X;}
transtype(A) ::= IMMEDIATE(X). {A = @X;}
transtype(A) ::= EXCLUSIVE(X). {A = @X;}
cmd ::= COMMIT trans_opt.      {sqlite3CommitTransaction(pParse);}
cmd ::= END trans_opt.         {sqlite3CommitTransaction(pParse);}
cmd ::= ROLLBACK trans_opt.    {sqlite3RollbackTransaction(pParse);}

savepoint_opt ::= SAVEPOINT.
savepoint_opt ::= .
cmd ::= SAVEPOINT nm(X). {
................................................................................

///////////////////// The CREATE TABLE statement ////////////////////////////
//
cmd ::= create_table create_table_args.
create_table ::= createkw temp(T) TABLE ifnotexists(E) nm(Y) dbnm(Z). {
   sqlite3StartTable(pParse,&Y,&Z,T,0,0,E);
}
createkw(A) ::= CREATE(X).  {
  disableLookaside(pParse);
  A = X;
}
%type ifnotexists {int}
ifnotexists(A) ::= .              {A = 0;}
ifnotexists(A) ::= IF NOT EXISTS. {A = 1;}
%type temp {int}
%ifndef SQLITE_OMIT_TEMPDB
temp(A) ::= TEMP.  {A = 1;}
%endif  SQLITE_OMIT_TEMPDB
................................................................................
columnlist ::= column.

// A "column" is a complete description of a single column in a
// CREATE TABLE statement.  This includes the column name, its
// datatype, and other keywords such as PRIMARY KEY, UNIQUE, REFERENCES,
// NOT NULL and so forth.
//
column(A) ::= columnid(X) type carglist. {
  A.z = X.z;
  A.n = (int)(pParse->sLastToken.z-X.z) + pParse->sLastToken.n;
}
columnid(A) ::= nm(X). {
  sqlite3AddColumn(pParse,&X);
  A = X;
  pParse->constraintName.n = 0;
}


// An IDENTIFIER can be a generic identifier, or one of several
// keywords.  Any non-standard keyword can also be an identifier.
//
................................................................................
// And "ids" is an identifer-or-string.
//
%token_class ids  ID|STRING.

// The name of a column or table can be any of the following:
//
%type nm {Token}
nm(A) ::= id(X).         {A = X;}
nm(A) ::= STRING(X).     {A = X;}
nm(A) ::= JOIN_KW(X).    {A = X;}

// A typetoken is really one or more tokens that form a type name such
// as can be found after the column name in a CREATE TABLE statement.
// Multiple tokens are concatenated to form the value of the typetoken.
//
%type typetoken {Token}
type ::= .
type ::= typetoken(X).                   {sqlite3AddColumnType(pParse,&X);}
typetoken(A) ::= typename(X).   {A = X;}
typetoken(A) ::= typename(X) LP signed RP(Y). {
  A.z = X.z;
  A.n = (int)(&Y.z[Y.n] - X.z);
}
typetoken(A) ::= typename(X) LP signed COMMA signed RP(Y). {
  A.z = X.z;
  A.n = (int)(&Y.z[Y.n] - X.z);
}
%type typename {Token}
typename(A) ::= ids(X).             {A = X;}
typename(A) ::= typename(X) ids(Y). {A.z=X.z; A.n=Y.n+(int)(Y.z-X.z);}
signed ::= plus_num.
signed ::= minus_num.

// "carglist" is a list of additional constraints that come after the
// column name and column type in a CREATE TABLE statement.
//
carglist ::= carglist ccons.
................................................................................
  v.pExpr = sqlite3PExpr(pParse, TK_UMINUS, X.pExpr, 0, 0);
  v.zStart = A.z;
  v.zEnd = X.zEnd;
  sqlite3AddDefaultValue(pParse,&v);
}
ccons ::= DEFAULT id(X).              {
  ExprSpan v;
  spanExpr(&v, pParse, TK_STRING, &X);
  sqlite3AddDefaultValue(pParse,&v);
}

// In addition to the type name, we also care about the primary key and
// UNIQUE constraints.
//
ccons ::= NULL onconf.
................................................................................
// The next group of rules parses the arguments to a REFERENCES clause
// that determine if the referential integrity checking is deferred or
// or immediate and which determine what action to take if a ref-integ
// check fails.
//
%type refargs {int}
refargs(A) ::= .                  { A = OE_None*0x0101; /* EV: R-19803-45884 */}
refargs(A) ::= refargs(X) refarg(Y). { A = (X & ~Y.mask) | Y.value; }
%type refarg {struct {int value; int mask;}}
refarg(A) ::= MATCH nm.              { A.value = 0;     A.mask = 0x000000; }
refarg(A) ::= ON INSERT refact.      { A.value = 0;     A.mask = 0x000000; }
refarg(A) ::= ON DELETE refact(X).   { A.value = X;     A.mask = 0x0000ff; }
refarg(A) ::= ON UPDATE refact(X).   { A.value = X<<8;  A.mask = 0x00ff00; }
%type refact {int}
refact(A) ::= SET NULL.              { A = OE_SetNull;  /* EV: R-33326-45252 */}
................................................................................
defer_subclause(A) ::= DEFERRABLE init_deferred_pred_opt(X).      {A = X;}
%type init_deferred_pred_opt {int}
init_deferred_pred_opt(A) ::= .                       {A = 0;}
init_deferred_pred_opt(A) ::= INITIALLY DEFERRED.     {A = 1;}
init_deferred_pred_opt(A) ::= INITIALLY IMMEDIATE.    {A = 0;}

conslist_opt(A) ::= .                         {A.n = 0; A.z = 0;}
conslist_opt(A) ::= COMMA(X) conslist.        {A = X;}
conslist ::= conslist tconscomma tcons.
conslist ::= tcons.
tconscomma ::= COMMA.            {pParse->constraintName.n = 0;}
tconscomma ::= .
tcons ::= CONSTRAINT nm(X).      {pParse->constraintName = X;}
tcons ::= PRIMARY KEY LP sortlist(X) autoinc(I) RP onconf(R).
                                 {sqlite3AddPrimaryKey(pParse,X,R,I,0);}
................................................................................
tcons ::= FOREIGN KEY LP eidlist(FA) RP
          REFERENCES nm(T) eidlist_opt(TA) refargs(R) defer_subclause_opt(D). {
    sqlite3CreateForeignKey(pParse, FA, &T, TA, R);
    sqlite3DeferForeignKey(pParse, D);
}
%type defer_subclause_opt {int}
defer_subclause_opt(A) ::= .                    {A = 0;}
defer_subclause_opt(A) ::= defer_subclause(X).  {A = X;}

// The following is a non-standard extension that allows us to declare the
// default behavior when there is a constraint conflict.
//
%type onconf {int}
%type orconf {int}
%type resolvetype {int}
onconf(A) ::= .                              {A = OE_Default;}
onconf(A) ::= ON CONFLICT resolvetype(X).    {A = X;}
orconf(A) ::= .                              {A = OE_Default;}
orconf(A) ::= OR resolvetype(X).             {A = X;}
resolvetype(A) ::= raisetype(X).             {A = X;}
resolvetype(A) ::= IGNORE.                   {A = OE_Ignore;}
resolvetype(A) ::= REPLACE.                  {A = OE_Replace;}

////////////////////////// The DROP TABLE /////////////////////////////////////
//
cmd ::= DROP TABLE ifexists(E) fullname(X). {
  sqlite3DropTable(pParse, X, 0, E);
................................................................................
  Select *p = X;
  if( p ){
    p->pWith = W;
    parserDoubleLinkSelect(pParse, p);
  }else{
    sqlite3WithDelete(pParse->db, W);
  }
  A = p;
}

selectnowith(A) ::= oneselect(X).                      {A = X;}
%ifndef SQLITE_OMIT_COMPOUND_SELECT
selectnowith(A) ::= selectnowith(X) multiselect_op(Y) oneselect(Z).  {
  Select *pRhs = Z;
  Select *pLhs = X;
  if( pRhs && pRhs->pPrior ){
    SrcList *pFrom;
    Token x;
    x.n = 0;
    parserDoubleLinkSelect(pParse, pRhs);
    pFrom = sqlite3SrcListAppendFromTerm(pParse,0,0,0,&x,pRhs,0,0);
    pRhs = sqlite3SelectNew(pParse,0,pFrom,0,0,0,0,0,0,0);
................................................................................
    if( Y!=TK_ALL ) pParse->hasCompound = 1;
  }else{
    sqlite3SelectDelete(pParse->db, pLhs);
  }
  A = pRhs;
}
%type multiselect_op {int}
multiselect_op(A) ::= UNION(OP).             {A = @OP;}
multiselect_op(A) ::= UNION ALL.             {A = TK_ALL;}
multiselect_op(A) ::= EXCEPT|INTERSECT(OP).  {A = @OP;}
%endif SQLITE_OMIT_COMPOUND_SELECT
oneselect(A) ::= SELECT(S) distinct(D) selcollist(W) from(X) where_opt(Y)
                 groupby_opt(P) having_opt(Q) orderby_opt(Z) limit_opt(L). {



  A = sqlite3SelectNew(pParse,W,X,Y,P,Q,Z,D,L.pLimit,L.pOffset);
#if SELECTTRACE_ENABLED
  /* Populate the Select.zSelName[] string that is used to help with
  ** query planner debugging, to differentiate between multiple Select
  ** objects in a complex query.
  **
  ** If the SELECT keyword is immediately followed by a C-style comment
  ** then extract the first few alphanumeric characters from within that
  ** comment to be the zSelName value.  Otherwise, the label is #N where
  ** is an integer that is incremented with each SELECT statement seen.
  */
  if( A!=0 ){
    const char *z = S.z+6;
    int i;
    sqlite3_snprintf(sizeof(A->zSelName), A->zSelName, "#%d",
                     ++pParse->nSelect);
    while( z[0]==' ' ) z++;
    if( z[0]=='/' && z[1]=='*' ){
      z += 2;
      while( z[0]==' ' ) z++;
      for(i=0; sqlite3Isalnum(z[i]); i++){}
      sqlite3_snprintf(sizeof(A->zSelName), A->zSelName, "%.*s", i, z);
    }
  }
#endif /* SELECTRACE_ENABLED */
}
oneselect(A) ::= values(X).    {A = X;}

%type values {Select*}
%destructor values {sqlite3SelectDelete(pParse->db, $$);}
values(A) ::= VALUES LP nexprlist(X) RP. {
  A = sqlite3SelectNew(pParse,X,0,0,0,0,0,SF_Values,0,0);
}
values(A) ::= values(X) COMMA LP exprlist(Y) RP. {
  Select *pRight, *pLeft = X;
  pRight = sqlite3SelectNew(pParse,Y,0,0,0,0,0,SF_Values|SF_MultiValue,0,0);
  if( ALWAYS(pLeft) ) pLeft->selFlags &= ~SF_MultiValue;
  if( pRight ){
    pRight->op = TK_ALL;
    pLeft = X;
    pRight->pPrior = pLeft;
    A = pRight;
  }else{
    A = pLeft;
  }
}

................................................................................
// "SELECT * FROM ..." is encoded as a special expression with an
// opcode of TK_ASTERISK.
//
%type selcollist {ExprList*}
%destructor selcollist {sqlite3ExprListDelete(pParse->db, $$);}
%type sclp {ExprList*}
%destructor sclp {sqlite3ExprListDelete(pParse->db, $$);}
sclp(A) ::= selcollist(X) COMMA.             {A = X;}
sclp(A) ::= .                                {A = 0;}
selcollist(A) ::= sclp(P) expr(X) as(Y).     {
   A = sqlite3ExprListAppend(pParse, P, X.pExpr);
   if( Y.n>0 ) sqlite3ExprListSetName(pParse, A, &Y, 1);
   sqlite3ExprListSetSpan(pParse,A,&X);
}
selcollist(A) ::= sclp(P) STAR. {
  Expr *p = sqlite3Expr(pParse->db, TK_ASTERISK, 0);
  A = sqlite3ExprListAppend(pParse, P, p);
}
selcollist(A) ::= sclp(P) nm(X) DOT STAR(Y). {
  Expr *pRight = sqlite3PExpr(pParse, TK_ASTERISK, 0, 0, &Y);
  Expr *pLeft = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *pDot = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight, 0);
  A = sqlite3ExprListAppend(pParse,P, pDot);
}

// An option "AS <id>" phrase that can follow one of the expressions that
// define the result set, or one of the tables in the FROM clause.
//
%type as {Token}
as(X) ::= AS nm(Y).    {X = Y;}
as(X) ::= ids(Y).      {X = Y;}
as(X) ::= .            {X.n = 0;}


%type seltablist {SrcList*}
%destructor seltablist {sqlite3SrcListDelete(pParse->db, $$);}
%type stl_prefix {SrcList*}
%destructor stl_prefix {sqlite3SrcListDelete(pParse->db, $$);}
................................................................................
  A = X;
  sqlite3SrcListShiftJoinType(A);
}

// "seltablist" is a "Select Table List" - the content of the FROM clause
// in a SELECT statement.  "stl_prefix" is a prefix of this list.
//
stl_prefix(A) ::= seltablist(X) joinop(Y).    {
   A = X;
   if( ALWAYS(A && A->nSrc>0) ) A->a[A->nSrc-1].fg.jointype = (u8)Y;
}
stl_prefix(A) ::= .                           {A = 0;}
seltablist(A) ::= stl_prefix(X) nm(Y) dbnm(D) as(Z) indexed_opt(I)
                  on_opt(N) using_opt(U). {
  A = sqlite3SrcListAppendFromTerm(pParse,X,&Y,&D,&Z,0,N,U);
  sqlite3SrcListIndexedBy(pParse, A, &I);
}
seltablist(A) ::= stl_prefix(X) nm(Y) dbnm(D) LP exprlist(E) RP as(Z)
                  on_opt(N) using_opt(U). {
  A = sqlite3SrcListAppendFromTerm(pParse,X,&Y,&D,&Z,0,N,U);
  sqlite3SrcListFuncArgs(pParse, A, E);
}
%ifndef SQLITE_OMIT_SUBQUERY
  seltablist(A) ::= stl_prefix(X) LP select(S) RP
                    as(Z) on_opt(N) using_opt(U). {
    A = sqlite3SrcListAppendFromTerm(pParse,X,0,0,&Z,S,N,U);
  }
  seltablist(A) ::= stl_prefix(X) LP seltablist(F) RP
                    as(Z) on_opt(N) using_opt(U). {
    if( X==0 && Z.n==0 && N==0 && U==0 ){
      A = F;
    }else if( F->nSrc==1 ){
      A = sqlite3SrcListAppendFromTerm(pParse,X,0,0,&Z,0,N,U);
      if( A ){
        struct SrcList_item *pNew = &A->a[A->nSrc-1];
        struct SrcList_item *pOld = F->a;
        pNew->zName = pOld->zName;
        pNew->zDatabase = pOld->zDatabase;
        pNew->pSelect = pOld->pSelect;
        pOld->zName = pOld->zDatabase = 0;
................................................................................
        pOld->pSelect = 0;
      }
      sqlite3SrcListDelete(pParse->db, F);
    }else{
      Select *pSubquery;
      sqlite3SrcListShiftJoinType(F);
      pSubquery = sqlite3SelectNew(pParse,0,F,0,0,0,0,SF_NestedFrom,0,0);
      A = sqlite3SrcListAppendFromTerm(pParse,X,0,0,&Z,pSubquery,N,U);
    }
  }
%endif  SQLITE_OMIT_SUBQUERY

%type dbnm {Token}
dbnm(A) ::= .          {A.z=0; A.n=0;}
dbnm(A) ::= DOT nm(X). {A = X;}

%type fullname {SrcList*}
%destructor fullname {sqlite3SrcListDelete(pParse->db, $$);}

fullname(A) ::= nm(X) dbnm(Y).  {A = sqlite3SrcListAppend(pParse->db,0,&X,&Y);}

%type joinop {int}
joinop(X) ::= COMMA|JOIN.              { X = JT_INNER; }
joinop(X) ::= JOIN_KW(A) JOIN.         { X = sqlite3JoinType(pParse,&A,0,0); }

joinop(X) ::= JOIN_KW(A) nm(B) JOIN.   { X = sqlite3JoinType(pParse,&A,&B,0); }

joinop(X) ::= JOIN_KW(A) nm(B) nm(C) JOIN.
                                       { X = sqlite3JoinType(pParse,&A,&B,&C); }

%type on_opt {Expr*}
%destructor on_opt {sqlite3ExprDelete(pParse->db, $$);}
on_opt(N) ::= ON expr(E).   {N = E.pExpr;}
on_opt(N) ::= .             {N = 0;}

// Note that this block abuses the Token type just a little. If there is
................................................................................
// sort order.
//
%type sortlist {ExprList*}
%destructor sortlist {sqlite3ExprListDelete(pParse->db, $$);}

orderby_opt(A) ::= .                          {A = 0;}
orderby_opt(A) ::= ORDER BY sortlist(X).      {A = X;}
sortlist(A) ::= sortlist(X) COMMA expr(Y) sortorder(Z). {
  A = sqlite3ExprListAppend(pParse,X,Y.pExpr);
  sqlite3ExprListSetSortOrder(A,Z);
}
sortlist(A) ::= expr(Y) sortorder(Z). {
  A = sqlite3ExprListAppend(pParse,0,Y.pExpr);
  sqlite3ExprListSetSortOrder(A,Z);
}

%type sortorder {int}

sortorder(A) ::= ASC.           {A = SQLITE_SO_ASC;}
sortorder(A) ::= DESC.          {A = SQLITE_SO_DESC;}
................................................................................
  sqlite3Update(pParse,X,Y,W,R);
}
%endif

%type setlist {ExprList*}
%destructor setlist {sqlite3ExprListDelete(pParse->db, $$);}

setlist(A) ::= setlist(Z) COMMA nm(X) EQ expr(Y). {
  A = sqlite3ExprListAppend(pParse, Z, Y.pExpr);
  sqlite3ExprListSetName(pParse, A, &X, 1);
}
setlist(A) ::= nm(X) EQ expr(Y). {
  A = sqlite3ExprListAppend(pParse, 0, Y.pExpr);
  sqlite3ExprListSetName(pParse, A, &X, 1);
}

................................................................................
%type idlist_opt {IdList*}
%destructor idlist_opt {sqlite3IdListDelete(pParse->db, $$);}
%type idlist {IdList*}
%destructor idlist {sqlite3IdListDelete(pParse->db, $$);}

idlist_opt(A) ::= .                       {A = 0;}
idlist_opt(A) ::= LP idlist(X) RP.    {A = X;}
idlist(A) ::= idlist(X) COMMA nm(Y).
    {A = sqlite3IdListAppend(pParse->db,X,&Y);}
idlist(A) ::= nm(Y).
    {A = sqlite3IdListAppend(pParse->db,0,&Y);}

/////////////////////////// Expression Processing /////////////////////////////
//

%type expr {ExprSpan}
%destructor expr {sqlite3ExprDelete(pParse->db, $$.pExpr);}
%type term {ExprSpan}
................................................................................
    pOut->zEnd = &pEnd->z[pEnd->n];
  }

  /* Construct a new Expr object from a single identifier.  Use the
  ** new Expr to populate pOut.  Set the span of pOut to be the identifier
  ** that created the expression.
  */
  static void spanExpr(ExprSpan *pOut, Parse *pParse, int op, Token *pValue){
    pOut->pExpr = sqlite3PExpr(pParse, op, 0, 0, pValue);
    pOut->zStart = pValue->z;
    pOut->zEnd = &pValue->z[pValue->n];
  }
}

expr(A) ::= term(X).             {A = X;}
expr(A) ::= LP(B) expr(X) RP(E). {A.pExpr = X.pExpr; spanSet(&A,&B,&E);}

term(A) ::= NULL(X).             {spanExpr(&A, pParse, @X, &X);}
expr(A) ::= id(X).               {spanExpr(&A, pParse, TK_ID, &X);}
expr(A) ::= JOIN_KW(X).          {spanExpr(&A, pParse, TK_ID, &X);}
expr(A) ::= nm(X) DOT nm(Y). {
  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Y);

  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp2, 0);
  spanSet(&A,&X,&Y);
}
expr(A) ::= nm(X) DOT nm(Y) DOT nm(Z). {
  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Y);
  Expr *temp3 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Z);
  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);

  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);
  spanSet(&A,&X,&Z);
}
term(A) ::= INTEGER|FLOAT|BLOB(X).  {spanExpr(&A, pParse, @X, &X);}
term(A) ::= STRING(X).              {spanExpr(&A, pParse, @X, &X);}
expr(A) ::= VARIABLE(X).     {

  if( X.n>=2 && X.z[0]=='#' && sqlite3Isdigit(X.z[1]) ){
    /* When doing a nested parse, one can include terms in an expression
    ** that look like this:   #1 #2 ...  These terms refer to registers
    ** in the virtual machine.  #N is the N-th register. */

    if( pParse->nested==0 ){
      sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &X);
      A.pExpr = 0;
    }else{
      A.pExpr = sqlite3PExpr(pParse, TK_REGISTER, 0, 0, &X);
      if( A.pExpr ) sqlite3GetInt32(&X.z[1], &A.pExpr->iTable);
    }
  }else{
    spanExpr(&A, pParse, TK_VARIABLE, &X);
    sqlite3ExprAssignVarNumber(pParse, A.pExpr);
  }
  spanSet(&A, &X, &X);
}
expr(A) ::= expr(E) COLLATE ids(C). {
  A.pExpr = sqlite3ExprAddCollateToken(pParse, E.pExpr, &C, 1);
  A.zStart = E.zStart;
  A.zEnd = &C.z[C.n];
}
%ifndef SQLITE_OMIT_CAST
expr(A) ::= CAST(X) LP expr(E) AS typetoken(T) RP(Y). {

  A.pExpr = sqlite3PExpr(pParse, TK_CAST, E.pExpr, 0, &T);
  spanSet(&A,&X,&Y);
}
%endif  SQLITE_OMIT_CAST
expr(A) ::= id(X) LP distinct(D) exprlist(Y) RP(E). {
  if( Y && Y->nExpr>pParse->db->aLimit[SQLITE_LIMIT_FUNCTION_ARG] ){
    sqlite3ErrorMsg(pParse, "too many arguments on function %T", &X);
  }
  A.pExpr = sqlite3ExprFunction(pParse, Y, &X);
................................................................................
}

%include {
  /* This routine constructs a binary expression node out of two ExprSpan
  ** objects and uses the result to populate a new ExprSpan object.
  */
  static void spanBinaryExpr(
    ExprSpan *pOut,     /* Write the result here */
    Parse *pParse,      /* The parsing context.  Errors accumulate here */
    int op,             /* The binary operation */
    ExprSpan *pLeft,    /* The left operand */
    ExprSpan *pRight    /* The right operand */
  ){
    pOut->pExpr = sqlite3PExpr(pParse, op, pLeft->pExpr, pRight->pExpr, 0);
    pOut->zStart = pLeft->zStart;
    pOut->zEnd = pRight->zEnd;
  }

  /* If doNot is true, then add a TK_NOT Expr-node wrapper around the
  ** outside of *ppExpr.
  */
  static void exprNot(Parse *pParse, int doNot, Expr **ppExpr){

    if( doNot ) *ppExpr = sqlite3PExpr(pParse, TK_NOT, *ppExpr, 0, 0);
  }
}


expr(A) ::= expr(X) AND(OP) expr(Y).    {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) OR(OP) expr(Y).     {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) LT|GT|GE|LE(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) EQ|NE(OP) expr(Y).  {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) BITAND|BITOR|LSHIFT|RSHIFT(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) PLUS|MINUS(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) STAR|SLASH|REM(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) CONCAT(OP) expr(Y). {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
%type likeop {struct LikeOp}
likeop(A) ::= LIKE_KW|MATCH(X).     {A.eOperator = X; A.bNot = 0;}
likeop(A) ::= NOT LIKE_KW|MATCH(X). {A.eOperator = X; A.bNot = 1;}
expr(A) ::= expr(X) likeop(OP) expr(Y).  [LIKE_KW]  {
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, X.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  exprNot(pParse, OP.bNot, &A.pExpr);
  A.zStart = X.zStart;
  A.zEnd = Y.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}
expr(A) ::= expr(X) likeop(OP) expr(Y) ESCAPE expr(E).  [LIKE_KW]  {
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, X.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, E.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  exprNot(pParse, OP.bNot, &A.pExpr);
  A.zStart = X.zStart;
  A.zEnd = E.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}

%include {
  /* Construct an expression node for a unary postfix operator
  */
  static void spanUnaryPostfix(
    ExprSpan *pOut,        /* Write the new expression node here */
    Parse *pParse,         /* Parsing context to record errors */
    int op,                /* The operator */
    ExprSpan *pOperand,    /* The operand */
    Token *pPostOp         /* The operand token for setting the span */
  ){
    pOut->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0, 0);
    pOut->zStart = pOperand->zStart;
    pOut->zEnd = &pPostOp->z[pPostOp->n];
  }                           
}

expr(A) ::= expr(X) ISNULL|NOTNULL(E).   {spanUnaryPostfix(&A,pParse,@E,&X,&E);}
expr(A) ::= expr(X) NOT NULL(E). {spanUnaryPostfix(&A,pParse,TK_NOTNULL,&X,&E);}

%include {
  /* A routine to convert a binary TK_IS or TK_ISNOT expression into a
  ** unary TK_ISNULL or TK_NOTNULL expression. */
  static void binaryToUnaryIfNull(Parse *pParse, Expr *pY, Expr *pA, int op){
    sqlite3 *db = pParse->db;
    if( pA && pY && pY->op==TK_NULL ){
................................................................................

//    expr1 IS expr2
//    expr1 IS NOT expr2
//
// If expr2 is NULL then code as TK_ISNULL or TK_NOTNULL.  If expr2
// is any other expression, code as TK_IS or TK_ISNOT.
// 
expr(A) ::= expr(X) IS expr(Y).     {
  spanBinaryExpr(&A,pParse,TK_IS,&X,&Y);
  binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_ISNULL);
}
expr(A) ::= expr(X) IS NOT expr(Y). {
  spanBinaryExpr(&A,pParse,TK_ISNOT,&X,&Y);
  binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_NOTNULL);
}

%include {
  /* Construct an expression node for a unary prefix operator
  */
  static void spanUnaryPrefix(
    ExprSpan *pOut,        /* Write the new expression node here */
    Parse *pParse,         /* Parsing context to record errors */
    int op,                /* The operator */
    ExprSpan *pOperand,    /* The operand */
    Token *pPreOp         /* The operand token for setting the span */
  ){
    pOut->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0, 0);
    pOut->zStart = pPreOp->z;

    pOut->zEnd = pOperand->zEnd;
  }
}




expr(A) ::= NOT(B) expr(X).    {spanUnaryPrefix(&A,pParse,@B,&X,&B);}
expr(A) ::= BITNOT(B) expr(X). {spanUnaryPrefix(&A,pParse,@B,&X,&B);}

expr(A) ::= MINUS(B) expr(X). [BITNOT]
                               {spanUnaryPrefix(&A,pParse,TK_UMINUS,&X,&B);}
expr(A) ::= PLUS(B) expr(X). [BITNOT]
                               {spanUnaryPrefix(&A,pParse,TK_UPLUS,&X,&B);}

%type between_op {int}
between_op(A) ::= BETWEEN.     {A = 0;}
between_op(A) ::= NOT BETWEEN. {A = 1;}
expr(A) ::= expr(W) between_op(N) expr(X) AND expr(Y). [BETWEEN] {
  ExprList *pList = sqlite3ExprListAppend(pParse,0, X.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, Y.pExpr);
  A.pExpr = sqlite3PExpr(pParse, TK_BETWEEN, W.pExpr, 0, 0);
  if( A.pExpr ){
    A.pExpr->x.pList = pList;
  }else{
    sqlite3ExprListDelete(pParse->db, pList);
  } 
  exprNot(pParse, N, &A.pExpr);
  A.zStart = W.zStart;
  A.zEnd = Y.zEnd;
}
%ifndef SQLITE_OMIT_SUBQUERY
  %type in_op {int}
  in_op(A) ::= IN.      {A = 0;}
  in_op(A) ::= NOT IN.  {A = 1;}
  expr(A) ::= expr(X) in_op(N) LP exprlist(Y) RP(E). [IN] {
    if( Y==0 ){
      /* Expressions of the form
      **
      **      expr1 IN ()
      **      expr1 NOT IN ()
      **
      ** simplify to constants 0 (false) and 1 (true), respectively,
      ** regardless of the value of expr1.
      */

      A.pExpr = sqlite3PExpr(pParse, TK_INTEGER, 0, 0, &sqlite3IntTokens[N]);
      sqlite3ExprDelete(pParse->db, X.pExpr);
    }else if( Y->nExpr==1 ){
      /* Expressions of the form:
      **
      **      expr1 IN (?1)
      **      expr1 NOT IN (?2)
      **
      ** with exactly one value on the RHS can be simplified to something
................................................................................
      sqlite3ExprListDelete(pParse->db, Y);
      /* pRHS cannot be NULL because a malloc error would have been detected
      ** before now and control would have never reached this point */
      if( ALWAYS(pRHS) ){
        pRHS->flags &= ~EP_Collate;
        pRHS->flags |= EP_Generic;
      }
      A.pExpr = sqlite3PExpr(pParse, N ? TK_NE : TK_EQ, X.pExpr, pRHS, 0);
    }else{
      A.pExpr = sqlite3PExpr(pParse, TK_IN, X.pExpr, 0, 0);
      if( A.pExpr ){
        A.pExpr->x.pList = Y;
        sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
      }else{
        sqlite3ExprListDelete(pParse->db, Y);
      }
      exprNot(pParse, N, &A.pExpr);
    }
    A.zStart = X.zStart;
    A.zEnd = &E.z[E.n];
  }
  expr(A) ::= LP(B) select(X) RP(E). {

    A.pExpr = sqlite3PExpr(pParse, TK_SELECT, 0, 0, 0);
    if( A.pExpr ){
      A.pExpr->x.pSelect = X;
      ExprSetProperty(A.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
    }else{
      sqlite3SelectDelete(pParse->db, X);
    }
    A.zStart = B.z;
    A.zEnd = &E.z[E.n];
  }
  expr(A) ::= expr(X) in_op(N) LP select(Y) RP(E).  [IN] {
    A.pExpr = sqlite3PExpr(pParse, TK_IN, X.pExpr, 0, 0);
    if( A.pExpr ){
      A.pExpr->x.pSelect = Y;
      ExprSetProperty(A.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
    }else{
      sqlite3SelectDelete(pParse->db, Y);
    }
    exprNot(pParse, N, &A.pExpr);
    A.zStart = X.zStart;
    A.zEnd = &E.z[E.n];
  }
  expr(A) ::= expr(X) in_op(N) nm(Y) dbnm(Z). [IN] {
    SrcList *pSrc = sqlite3SrcListAppend(pParse->db, 0,&Y,&Z);
    A.pExpr = sqlite3PExpr(pParse, TK_IN, X.pExpr, 0, 0);
    if( A.pExpr ){
      A.pExpr->x.pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0,0);
      ExprSetProperty(A.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
    }else{
      sqlite3SrcListDelete(pParse->db, pSrc);
    }
    exprNot(pParse, N, &A.pExpr);
    A.zStart = X.zStart;
    A.zEnd = Z.z ? &Z.z[Z.n] : &Y.z[Y.n];
  }
  expr(A) ::= EXISTS(B) LP select(Y) RP(E). {


    Expr *p = A.pExpr = sqlite3PExpr(pParse, TK_EXISTS, 0, 0, 0);
    if( p ){
      p->x.pSelect = Y;
      ExprSetProperty(p, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, p);
    }else{
      sqlite3SelectDelete(pParse->db, Y);
    }
    A.zStart = B.z;
    A.zEnd = &E.z[E.n];
  }
%endif SQLITE_OMIT_SUBQUERY

/* CASE expressions */
expr(A) ::= CASE(C) case_operand(X) case_exprlist(Y) case_else(Z) END(E). {

  A.pExpr = sqlite3PExpr(pParse, TK_CASE, X, 0, 0);
  if( A.pExpr ){
    A.pExpr->x.pList = Z ? sqlite3ExprListAppend(pParse,Y,Z) : Y;
    sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
  }else{
    sqlite3ExprListDelete(pParse->db, Y);
    sqlite3ExprDelete(pParse->db, Z);
  }
  A.zStart = C.z;
  A.zEnd = &E.z[E.n];
}
%type case_exprlist {ExprList*}
%destructor case_exprlist {sqlite3ExprListDelete(pParse->db, $$);}
case_exprlist(A) ::= case_exprlist(X) WHEN expr(Y) THEN expr(Z). {
  A = sqlite3ExprListAppend(pParse,X, Y.pExpr);
  A = sqlite3ExprListAppend(pParse,A, Z.pExpr);
}
case_exprlist(A) ::= WHEN expr(Y) THEN expr(Z). {
  A = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  A = sqlite3ExprListAppend(pParse,A, Z.pExpr);
}
%type case_else {Expr*}
%destructor case_else {sqlite3ExprDelete(pParse->db, $$);}
case_else(A) ::=  ELSE expr(X).         {A = X.pExpr;}
case_else(A) ::=  .                     {A = 0;} 
%type case_operand {Expr*}
%destructor case_operand {sqlite3ExprDelete(pParse->db, $$);}
case_operand(A) ::= expr(X).            {A = X.pExpr;} 
case_operand(A) ::= .                   {A = 0;} 

%type exprlist {ExprList*}
%destructor exprlist {sqlite3ExprListDelete(pParse->db, $$);}
%type nexprlist {ExprList*}
%destructor nexprlist {sqlite3ExprListDelete(pParse->db, $$);}

exprlist(A) ::= nexprlist(X).                {A = X;}
exprlist(A) ::= .                            {A = 0;}
nexprlist(A) ::= nexprlist(X) COMMA expr(Y).
    {A = sqlite3ExprListAppend(pParse,X,Y.pExpr);}
nexprlist(A) ::= expr(Y).
    {A = sqlite3ExprListAppend(pParse,0,Y.pExpr);}


///////////////////////////// The CREATE INDEX command ///////////////////////
//
cmd ::= createkw(S) uniqueflag(U) INDEX ifnotexists(NE) nm(X) dbnm(D)
        ON nm(Y) LP sortlist(Z) RP where_opt(W). {
  sqlite3CreateIndex(pParse, &X, &D, 
................................................................................
    sqlite3ExprListSetName(pParse, p, pIdToken, 1);
    return p;
  }
} // end %include

eidlist_opt(A) ::= .                         {A = 0;}
eidlist_opt(A) ::= LP eidlist(X) RP.         {A = X;}
eidlist(A) ::= eidlist(X) COMMA nm(Y) collate(C) sortorder(Z).  {
  A = parserAddExprIdListTerm(pParse, X, &Y, C, Z);
}
eidlist(A) ::= nm(Y) collate(C) sortorder(Z). {
  A = parserAddExprIdListTerm(pParse, 0, &Y, C, Z);
}

%type collate {int}
collate(C) ::= .              {C = 0;}
collate(C) ::= COLLATE ids.   {C = 1;}


................................................................................
cmd ::= PRAGMA nm(X) dbnm(Z) EQ nmnum(Y).    {sqlite3Pragma(pParse,&X,&Z,&Y,0);}
cmd ::= PRAGMA nm(X) dbnm(Z) LP nmnum(Y) RP. {sqlite3Pragma(pParse,&X,&Z,&Y,0);}
cmd ::= PRAGMA nm(X) dbnm(Z) EQ minus_num(Y). 
                                             {sqlite3Pragma(pParse,&X,&Z,&Y,1);}
cmd ::= PRAGMA nm(X) dbnm(Z) LP minus_num(Y) RP.
                                             {sqlite3Pragma(pParse,&X,&Z,&Y,1);}

nmnum(A) ::= plus_num(X).             {A = X;}
nmnum(A) ::= nm(X).                   {A = X;}
nmnum(A) ::= ON(X).                   {A = X;}
nmnum(A) ::= DELETE(X).               {A = X;}
nmnum(A) ::= DEFAULT(X).              {A = X;}
%endif SQLITE_OMIT_PRAGMA
%token_class number INTEGER|FLOAT.
plus_num(A) ::= PLUS number(X).       {A = X;}
plus_num(A) ::= number(X).            {A = X;}
minus_num(A) ::= MINUS number(X).     {A = X;}
//////////////////////////// The CREATE TRIGGER command /////////////////////

%ifndef SQLITE_OMIT_TRIGGER

cmd ::= createkw trigger_decl(A) BEGIN trigger_cmd_list(S) END(Z). {
  Token all;
................................................................................
  sqlite3FinishTrigger(pParse, S, &all);
}

trigger_decl(A) ::= temp(T) TRIGGER ifnotexists(NOERR) nm(B) dbnm(Z) 
                    trigger_time(C) trigger_event(D)
                    ON fullname(E) foreach_clause when_clause(G). {
  sqlite3BeginTrigger(pParse, &B, &Z, C, D.a, D.b, E, G, T, NOERR);
  A = (Z.n==0?B:Z);
}

%type trigger_time {int}
trigger_time(A) ::= BEFORE.      { A = TK_BEFORE; }
trigger_time(A) ::= AFTER.       { A = TK_AFTER;  }
trigger_time(A) ::= INSTEAD OF.  { A = TK_INSTEAD;}
trigger_time(A) ::= .            { A = TK_BEFORE; }

%type trigger_event {struct TrigEvent}
%destructor trigger_event {sqlite3IdListDelete(pParse->db, $$.b);}
trigger_event(A) ::= DELETE|INSERT(OP).       {A.a = @OP; A.b = 0;}
trigger_event(A) ::= UPDATE(OP).              {A.a = @OP; A.b = 0;}
trigger_event(A) ::= UPDATE OF idlist(X). {A.a = TK_UPDATE; A.b = X;}

foreach_clause ::= .
foreach_clause ::= FOR EACH ROW.

%type when_clause {Expr*}
%destructor when_clause {sqlite3ExprDelete(pParse->db, $$);}
when_clause(A) ::= .             { A = 0; }
when_clause(A) ::= WHEN expr(X). { A = X.pExpr; }

%type trigger_cmd_list {TriggerStep*}
%destructor trigger_cmd_list {sqlite3DeleteTriggerStep(pParse->db, $$);}
trigger_cmd_list(A) ::= trigger_cmd_list(Y) trigger_cmd(X) SEMI. {
  assert( Y!=0 );
  Y->pLast->pNext = X;
  Y->pLast = X;
  A = Y;
}
trigger_cmd_list(A) ::= trigger_cmd(X) SEMI. { 
  assert( X!=0 );
  X->pLast = X;
  A = X;
}

// Disallow qualified table names on INSERT, UPDATE, and DELETE statements
// within a trigger.  The table to INSERT, UPDATE, or DELETE is always in 
// the same database as the table that the trigger fires on.
//
%type trnm {Token}
trnm(A) ::= nm(X).   {A = X;}
trnm(A) ::= nm DOT nm(X). {
  A = X;
  sqlite3ErrorMsg(pParse, 
        "qualified table names are not allowed on INSERT, UPDATE, and DELETE "
        "statements within triggers");
}

................................................................................


%type trigger_cmd {TriggerStep*}
%destructor trigger_cmd {sqlite3DeleteTriggerStep(pParse->db, $$);}
// UPDATE 
trigger_cmd(A) ::=
   UPDATE orconf(R) trnm(X) tridxby SET setlist(Y) where_opt(Z).  
   { A = sqlite3TriggerUpdateStep(pParse->db, &X, Y, Z, R); }

// INSERT
trigger_cmd(A) ::= insert_cmd(R) INTO trnm(X) idlist_opt(F) select(S).
               {A = sqlite3TriggerInsertStep(pParse->db, &X, F, S, R);}

// DELETE
trigger_cmd(A) ::= DELETE FROM trnm(X) tridxby where_opt(Y).
               {A = sqlite3TriggerDeleteStep(pParse->db, &X, Y);}

// SELECT

trigger_cmd(A) ::= select(X).  {A = sqlite3TriggerSelectStep(pParse->db, X); }

// The special RAISE expression that may occur in trigger programs
expr(A) ::= RAISE(X) LP IGNORE RP(Y).  {

  A.pExpr = sqlite3PExpr(pParse, TK_RAISE, 0, 0, 0); 
  if( A.pExpr ){
    A.pExpr->affinity = OE_Ignore;
  }
  A.zStart = X.z;
  A.zEnd = &Y.z[Y.n];
}
expr(A) ::= RAISE(X) LP raisetype(T) COMMA nm(Z) RP(Y).  {

  A.pExpr = sqlite3PExpr(pParse, TK_RAISE, 0, 0, &Z); 
  if( A.pExpr ) {
    A.pExpr->affinity = (char)T;
  }
  A.zStart = X.z;
  A.zEnd = &Y.z[Y.n];
}
%endif  !SQLITE_OMIT_TRIGGER

%type raisetype {int}
raisetype(A) ::= ROLLBACK.  {A = OE_Rollback;}
raisetype(A) ::= ABORT.     {A = OE_Abort;}
raisetype(A) ::= FAIL.      {A = OE_Fail;}
................................................................................

with(A) ::= . {A = 0;}
%ifndef SQLITE_OMIT_CTE
with(A) ::= WITH wqlist(W).              { A = W; }
with(A) ::= WITH RECURSIVE wqlist(W).    { A = W; }

wqlist(A) ::= nm(X) eidlist_opt(Y) AS LP select(Z) RP. {
  A = sqlite3WithAdd(pParse, 0, &X, Y, Z);
}
wqlist(A) ::= wqlist(W) COMMA nm(X) eidlist_opt(Y) AS LP select(Z) RP. {
  A = sqlite3WithAdd(pParse, W, &X, Y, Z);
}
%endif  SQLITE_OMIT_CTE

//
%syntax_error {
  UNUSED_PARAMETER(yymajor);  /* Silence some compiler warnings */
  assert( TOKEN.z[0] );  /* The tokenizer always gives us a token */
  sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &TOKEN);
}
%stack_overflow {

  sqlite3ErrorMsg(pParse, "parser stack overflow");
}

// The name of the generated procedure that implements the parser
// is as follows:
%name sqlite3Parser

................................................................................

cmd ::= BEGIN transtype(Y) trans_opt.  {sqlite3BeginTransaction(pParse, Y);}
trans_opt ::= .
trans_opt ::= TRANSACTION.
trans_opt ::= TRANSACTION nm.
%type transtype {int}
transtype(A) ::= .             {A = TK_DEFERRED;}
transtype(A) ::= DEFERRED(X).  {A = @X; /*A-overwrites-X*/}
transtype(A) ::= IMMEDIATE(X). {A = @X; /*A-overwrites-X*/}
transtype(A) ::= EXCLUSIVE(X). {A = @X; /*A-overwrites-X*/}
cmd ::= COMMIT trans_opt.      {sqlite3CommitTransaction(pParse);}
cmd ::= END trans_opt.         {sqlite3CommitTransaction(pParse);}
cmd ::= ROLLBACK trans_opt.    {sqlite3RollbackTransaction(pParse);}

savepoint_opt ::= SAVEPOINT.
savepoint_opt ::= .
cmd ::= SAVEPOINT nm(X). {
................................................................................

///////////////////// The CREATE TABLE statement ////////////////////////////
//
cmd ::= create_table create_table_args.
create_table ::= createkw temp(T) TABLE ifnotexists(E) nm(Y) dbnm(Z). {
   sqlite3StartTable(pParse,&Y,&Z,T,0,0,E);
}

createkw(A) ::= CREATE(A).  {disableLookaside(pParse);}


%type ifnotexists {int}
ifnotexists(A) ::= .              {A = 0;}
ifnotexists(A) ::= IF NOT EXISTS. {A = 1;}
%type temp {int}
%ifndef SQLITE_OMIT_TEMPDB
temp(A) ::= TEMP.  {A = 1;}
%endif  SQLITE_OMIT_TEMPDB
................................................................................
columnlist ::= column.

// A "column" is a complete description of a single column in a
// CREATE TABLE statement.  This includes the column name, its
// datatype, and other keywords such as PRIMARY KEY, UNIQUE, REFERENCES,
// NOT NULL and so forth.
//
column(A) ::= columnid(A) type carglist. {

  A.n = (int)(pParse->sLastToken.z-A.z) + pParse->sLastToken.n;
}
columnid(A) ::= nm(A). {
  sqlite3AddColumn(pParse,&A);

  pParse->constraintName.n = 0;
}


// An IDENTIFIER can be a generic identifier, or one of several
// keywords.  Any non-standard keyword can also be an identifier.
//
................................................................................
// And "ids" is an identifer-or-string.
//
%token_class ids  ID|STRING.

// The name of a column or table can be any of the following:
//
%type nm {Token}
nm(A) ::= id(A).
nm(A) ::= STRING(A).
nm(A) ::= JOIN_KW(A).

// A typetoken is really one or more tokens that form a type name such
// as can be found after the column name in a CREATE TABLE statement.
// Multiple tokens are concatenated to form the value of the typetoken.
//
%type typetoken {Token}
type ::= .
type ::= typetoken(X).                   {sqlite3AddColumnType(pParse,&X);}
typetoken(A) ::= typename(A).
typetoken(A) ::= typename(A) LP signed RP(Y). {

  A.n = (int)(&Y.z[Y.n] - A.z);
}
typetoken(A) ::= typename(A) LP signed COMMA signed RP(Y). {

  A.n = (int)(&Y.z[Y.n] - A.z);
}
%type typename {Token}
typename(A) ::= ids(A).
typename(A) ::= typename(A) ids(Y). {A.n=Y.n+(int)(Y.z-A.z);}
signed ::= plus_num.
signed ::= minus_num.

// "carglist" is a list of additional constraints that come after the
// column name and column type in a CREATE TABLE statement.
//
carglist ::= carglist ccons.
................................................................................
  v.pExpr = sqlite3PExpr(pParse, TK_UMINUS, X.pExpr, 0, 0);
  v.zStart = A.z;
  v.zEnd = X.zEnd;
  sqlite3AddDefaultValue(pParse,&v);
}
ccons ::= DEFAULT id(X).              {
  ExprSpan v;
  spanExpr(&v, pParse, TK_STRING, X);
  sqlite3AddDefaultValue(pParse,&v);
}

// In addition to the type name, we also care about the primary key and
// UNIQUE constraints.
//
ccons ::= NULL onconf.
................................................................................
// The next group of rules parses the arguments to a REFERENCES clause
// that determine if the referential integrity checking is deferred or
// or immediate and which determine what action to take if a ref-integ
// check fails.
//
%type refargs {int}
refargs(A) ::= .                  { A = OE_None*0x0101; /* EV: R-19803-45884 */}
refargs(A) ::= refargs(A) refarg(Y). { A = (A & ~Y.mask) | Y.value; }
%type refarg {struct {int value; int mask;}}
refarg(A) ::= MATCH nm.              { A.value = 0;     A.mask = 0x000000; }
refarg(A) ::= ON INSERT refact.      { A.value = 0;     A.mask = 0x000000; }
refarg(A) ::= ON DELETE refact(X).   { A.value = X;     A.mask = 0x0000ff; }
refarg(A) ::= ON UPDATE refact(X).   { A.value = X<<8;  A.mask = 0x00ff00; }
%type refact {int}
refact(A) ::= SET NULL.              { A = OE_SetNull;  /* EV: R-33326-45252 */}
................................................................................
defer_subclause(A) ::= DEFERRABLE init_deferred_pred_opt(X).      {A = X;}
%type init_deferred_pred_opt {int}
init_deferred_pred_opt(A) ::= .                       {A = 0;}
init_deferred_pred_opt(A) ::= INITIALLY DEFERRED.     {A = 1;}
init_deferred_pred_opt(A) ::= INITIALLY IMMEDIATE.    {A = 0;}

conslist_opt(A) ::= .                         {A.n = 0; A.z = 0;}
conslist_opt(A) ::= COMMA(A) conslist.
conslist ::= conslist tconscomma tcons.
conslist ::= tcons.
tconscomma ::= COMMA.            {pParse->constraintName.n = 0;}
tconscomma ::= .
tcons ::= CONSTRAINT nm(X).      {pParse->constraintName = X;}
tcons ::= PRIMARY KEY LP sortlist(X) autoinc(I) RP onconf(R).
                                 {sqlite3AddPrimaryKey(pParse,X,R,I,0);}
................................................................................
tcons ::= FOREIGN KEY LP eidlist(FA) RP
          REFERENCES nm(T) eidlist_opt(TA) refargs(R) defer_subclause_opt(D). {
    sqlite3CreateForeignKey(pParse, FA, &T, TA, R);
    sqlite3DeferForeignKey(pParse, D);
}
%type defer_subclause_opt {int}
defer_subclause_opt(A) ::= .                    {A = 0;}
defer_subclause_opt(A) ::= defer_subclause(A).

// The following is a non-standard extension that allows us to declare the
// default behavior when there is a constraint conflict.
//
%type onconf {int}
%type orconf {int}
%type resolvetype {int}
onconf(A) ::= .                              {A = OE_Default;}
onconf(A) ::= ON CONFLICT resolvetype(X).    {A = X;}
orconf(A) ::= .                              {A = OE_Default;}
orconf(A) ::= OR resolvetype(X).             {A = X;}
resolvetype(A) ::= raisetype(A).
resolvetype(A) ::= IGNORE.                   {A = OE_Ignore;}
resolvetype(A) ::= REPLACE.                  {A = OE_Replace;}

////////////////////////// The DROP TABLE /////////////////////////////////////
//
cmd ::= DROP TABLE ifexists(E) fullname(X). {
  sqlite3DropTable(pParse, X, 0, E);
................................................................................
  Select *p = X;
  if( p ){
    p->pWith = W;
    parserDoubleLinkSelect(pParse, p);
  }else{
    sqlite3WithDelete(pParse->db, W);
  }
  A = p; /*A-overwrites-W*/
}

selectnowith(A) ::= oneselect(A).
%ifndef SQLITE_OMIT_COMPOUND_SELECT
selectnowith(A) ::= selectnowith(A) multiselect_op(Y) oneselect(Z).  {
  Select *pRhs = Z;
  Select *pLhs = A;
  if( pRhs && pRhs->pPrior ){
    SrcList *pFrom;
    Token x;
    x.n = 0;
    parserDoubleLinkSelect(pParse, pRhs);
    pFrom = sqlite3SrcListAppendFromTerm(pParse,0,0,0,&x,pRhs,0,0);
    pRhs = sqlite3SelectNew(pParse,0,pFrom,0,0,0,0,0,0,0);
................................................................................
    if( Y!=TK_ALL ) pParse->hasCompound = 1;
  }else{
    sqlite3SelectDelete(pParse->db, pLhs);
  }
  A = pRhs;
}
%type multiselect_op {int}
multiselect_op(A) ::= UNION(OP).             {A = @OP; /*A-overwrites-OP*/}
multiselect_op(A) ::= UNION ALL.             {A = TK_ALL;}
multiselect_op(A) ::= EXCEPT|INTERSECT(OP).  {A = @OP; /*A-overwrites-OP*/}
%endif SQLITE_OMIT_COMPOUND_SELECT
oneselect(A) ::= SELECT(S) distinct(D) selcollist(W) from(X) where_opt(Y)
                 groupby_opt(P) having_opt(Q) orderby_opt(Z) limit_opt(L). {
#if SELECTTRACE_ENABLED
  Token s = S; /*A-overwrites-S*/
#endif
  A = sqlite3SelectNew(pParse,W,X,Y,P,Q,Z,D,L.pLimit,L.pOffset);
#if SELECTTRACE_ENABLED
  /* Populate the Select.zSelName[] string that is used to help with
  ** query planner debugging, to differentiate between multiple Select
  ** objects in a complex query.
  **
  ** If the SELECT keyword is immediately followed by a C-style comment
  ** then extract the first few alphanumeric characters from within that
  ** comment to be the zSelName value.  Otherwise, the label is #N where
  ** is an integer that is incremented with each SELECT statement seen.
  */
  if( A!=0 ){
    const char *z = s.z+6;
    int i;
    sqlite3_snprintf(sizeof(A->zSelName), A->zSelName, "#%d",
                     ++pParse->nSelect);
    while( z[0]==' ' ) z++;
    if( z[0]=='/' && z[1]=='*' ){
      z += 2;
      while( z[0]==' ' ) z++;
      for(i=0; sqlite3Isalnum(z[i]); i++){}
      sqlite3_snprintf(sizeof(A->zSelName), A->zSelName, "%.*s", i, z);
    }
  }
#endif /* SELECTRACE_ENABLED */
}
oneselect(A) ::= values(A).

%type values {Select*}
%destructor values {sqlite3SelectDelete(pParse->db, $$);}
values(A) ::= VALUES LP nexprlist(X) RP. {
  A = sqlite3SelectNew(pParse,X,0,0,0,0,0,SF_Values,0,0);
}
values(A) ::= values(A) COMMA LP exprlist(Y) RP. {
  Select *pRight, *pLeft = A;
  pRight = sqlite3SelectNew(pParse,Y,0,0,0,0,0,SF_Values|SF_MultiValue,0,0);
  if( ALWAYS(pLeft) ) pLeft->selFlags &= ~SF_MultiValue;
  if( pRight ){
    pRight->op = TK_ALL;

    pRight->pPrior = pLeft;
    A = pRight;
  }else{
    A = pLeft;
  }
}

................................................................................
// "SELECT * FROM ..." is encoded as a special expression with an
// opcode of TK_ASTERISK.
//
%type selcollist {ExprList*}
%destructor selcollist {sqlite3ExprListDelete(pParse->db, $$);}
%type sclp {ExprList*}
%destructor sclp {sqlite3ExprListDelete(pParse->db, $$);}
sclp(A) ::= selcollist(A) COMMA.
sclp(A) ::= .                                {A = 0;}
selcollist(A) ::= sclp(A) expr(X) as(Y).     {
   A = sqlite3ExprListAppend(pParse, A, X.pExpr);
   if( Y.n>0 ) sqlite3ExprListSetName(pParse, A, &Y, 1);
   sqlite3ExprListSetSpan(pParse,A,&X);
}
selcollist(A) ::= sclp(A) STAR. {
  Expr *p = sqlite3Expr(pParse->db, TK_ASTERISK, 0);
  A = sqlite3ExprListAppend(pParse, A, p);
}
selcollist(A) ::= sclp(A) nm(X) DOT STAR(Y). {
  Expr *pRight = sqlite3PExpr(pParse, TK_ASTERISK, 0, 0, &Y);
  Expr *pLeft = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *pDot = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight, 0);
  A = sqlite3ExprListAppend(pParse,A, pDot);
}

// An option "AS <id>" phrase that can follow one of the expressions that
// define the result set, or one of the tables in the FROM clause.
//
%type as {Token}
as(X) ::= AS nm(Y).    {X = Y;}
as(X) ::= ids(X).
as(X) ::= .            {X.n = 0;}


%type seltablist {SrcList*}
%destructor seltablist {sqlite3SrcListDelete(pParse->db, $$);}
%type stl_prefix {SrcList*}
%destructor stl_prefix {sqlite3SrcListDelete(pParse->db, $$);}
................................................................................
  A = X;
  sqlite3SrcListShiftJoinType(A);
}

// "seltablist" is a "Select Table List" - the content of the FROM clause
// in a SELECT statement.  "stl_prefix" is a prefix of this list.
//
stl_prefix(A) ::= seltablist(A) joinop(Y).    {

   if( ALWAYS(A && A->nSrc>0) ) A->a[A->nSrc-1].fg.jointype = (u8)Y;
}
stl_prefix(A) ::= .                           {A = 0;}
seltablist(A) ::= stl_prefix(A) nm(Y) dbnm(D) as(Z) indexed_opt(I)
                  on_opt(N) using_opt(U). {
  A = sqlite3SrcListAppendFromTerm(pParse,A,&Y,&D,&Z,0,N,U);
  sqlite3SrcListIndexedBy(pParse, A, &I);
}
seltablist(A) ::= stl_prefix(A) nm(Y) dbnm(D) LP exprlist(E) RP as(Z)
                  on_opt(N) using_opt(U). {
  A = sqlite3SrcListAppendFromTerm(pParse,A,&Y,&D,&Z,0,N,U);
  sqlite3SrcListFuncArgs(pParse, A, E);
}
%ifndef SQLITE_OMIT_SUBQUERY
  seltablist(A) ::= stl_prefix(A) LP select(S) RP
                    as(Z) on_opt(N) using_opt(U). {
    A = sqlite3SrcListAppendFromTerm(pParse,A,0,0,&Z,S,N,U);
  }
  seltablist(A) ::= stl_prefix(A) LP seltablist(F) RP
                    as(Z) on_opt(N) using_opt(U). {
    if( A==0 && Z.n==0 && N==0 && U==0 ){
      A = F;
    }else if( F->nSrc==1 ){
      A = sqlite3SrcListAppendFromTerm(pParse,A,0,0,&Z,0,N,U);
      if( A ){
        struct SrcList_item *pNew = &A->a[A->nSrc-1];
        struct SrcList_item *pOld = F->a;
        pNew->zName = pOld->zName;
        pNew->zDatabase = pOld->zDatabase;
        pNew->pSelect = pOld->pSelect;
        pOld->zName = pOld->zDatabase = 0;
................................................................................
        pOld->pSelect = 0;
      }
      sqlite3SrcListDelete(pParse->db, F);
    }else{
      Select *pSubquery;
      sqlite3SrcListShiftJoinType(F);
      pSubquery = sqlite3SelectNew(pParse,0,F,0,0,0,0,SF_NestedFrom,0,0);
      A = sqlite3SrcListAppendFromTerm(pParse,A,0,0,&Z,pSubquery,N,U);
    }
  }
%endif  SQLITE_OMIT_SUBQUERY

%type dbnm {Token}
dbnm(A) ::= .          {A.z=0; A.n=0;}
dbnm(A) ::= DOT nm(X). {A = X;}

%type fullname {SrcList*}
%destructor fullname {sqlite3SrcListDelete(pParse->db, $$);}
fullname(A) ::= nm(X) dbnm(Y).  
   {A = sqlite3SrcListAppend(pParse->db,0,&X,&Y); /*A-overwrites-X*/}

%type joinop {int}
joinop(X) ::= COMMA|JOIN.              { X = JT_INNER; }
joinop(X) ::= JOIN_KW(A) JOIN.
                  {X = sqlite3JoinType(pParse,&A,0,0);  /*X-overwrites-A*/}
joinop(X) ::= JOIN_KW(A) nm(B) JOIN.
                  {X = sqlite3JoinType(pParse,&A,&B,0); /*X-overwrites-A*/}
joinop(X) ::= JOIN_KW(A) nm(B) nm(C) JOIN.
                  {X = sqlite3JoinType(pParse,&A,&B,&C);/*X-overwrites-A*/}

%type on_opt {Expr*}
%destructor on_opt {sqlite3ExprDelete(pParse->db, $$);}
on_opt(N) ::= ON expr(E).   {N = E.pExpr;}
on_opt(N) ::= .             {N = 0;}

// Note that this block abuses the Token type just a little. If there is
................................................................................
// sort order.
//
%type sortlist {ExprList*}
%destructor sortlist {sqlite3ExprListDelete(pParse->db, $$);}

orderby_opt(A) ::= .                          {A = 0;}
orderby_opt(A) ::= ORDER BY sortlist(X).      {A = X;}
sortlist(A) ::= sortlist(A) COMMA expr(Y) sortorder(Z). {
  A = sqlite3ExprListAppend(pParse,A,Y.pExpr);
  sqlite3ExprListSetSortOrder(A,Z);
}
sortlist(A) ::= expr(Y) sortorder(Z). {
  A = sqlite3ExprListAppend(pParse,0,Y.pExpr); /*A-overwrites-Y*/
  sqlite3ExprListSetSortOrder(A,Z);
}

%type sortorder {int}

sortorder(A) ::= ASC.           {A = SQLITE_SO_ASC;}
sortorder(A) ::= DESC.          {A = SQLITE_SO_DESC;}
................................................................................
  sqlite3Update(pParse,X,Y,W,R);
}
%endif

%type setlist {ExprList*}
%destructor setlist {sqlite3ExprListDelete(pParse->db, $$);}

setlist(A) ::= setlist(A) COMMA nm(X) EQ expr(Y). {
  A = sqlite3ExprListAppend(pParse, A, Y.pExpr);
  sqlite3ExprListSetName(pParse, A, &X, 1);
}
setlist(A) ::= nm(X) EQ expr(Y). {
  A = sqlite3ExprListAppend(pParse, 0, Y.pExpr);
  sqlite3ExprListSetName(pParse, A, &X, 1);
}

................................................................................
%type idlist_opt {IdList*}
%destructor idlist_opt {sqlite3IdListDelete(pParse->db, $$);}
%type idlist {IdList*}
%destructor idlist {sqlite3IdListDelete(pParse->db, $$);}

idlist_opt(A) ::= .                       {A = 0;}
idlist_opt(A) ::= LP idlist(X) RP.    {A = X;}
idlist(A) ::= idlist(A) COMMA nm(Y).
    {A = sqlite3IdListAppend(pParse->db,A,&Y);}
idlist(A) ::= nm(Y).
    {A = sqlite3IdListAppend(pParse->db,0,&Y); /*A-overwrites-Y*/}

/////////////////////////// Expression Processing /////////////////////////////
//

%type expr {ExprSpan}
%destructor expr {sqlite3ExprDelete(pParse->db, $$.pExpr);}
%type term {ExprSpan}
................................................................................
    pOut->zEnd = &pEnd->z[pEnd->n];
  }

  /* Construct a new Expr object from a single identifier.  Use the
  ** new Expr to populate pOut.  Set the span of pOut to be the identifier
  ** that created the expression.
  */
  static void spanExpr(ExprSpan *pOut, Parse *pParse, int op, Token t){
    pOut->pExpr = sqlite3PExpr(pParse, op, 0, 0, &t);
    pOut->zStart = t.z;
    pOut->zEnd = &t.z[t.n];
  }
}

expr(A) ::= term(A).
expr(A) ::= LP(B) expr(X) RP(E).
            {spanSet(&A,&B,&E); /*A-overwrites-B*/  A.pExpr = X.pExpr;}
term(A) ::= NULL(X).        {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
expr(A) ::= id(X).          {spanExpr(&A,pParse,TK_ID,X); /*A-overwrites-X*/}
expr(A) ::= JOIN_KW(X).     {spanExpr(&A,pParse,TK_ID,X); /*A-overwrites-X*/}
expr(A) ::= nm(X) DOT nm(Y). {
  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Y);
  spanSet(&A,&X,&Y); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp2, 0);

}
expr(A) ::= nm(X) DOT nm(Y) DOT nm(Z). {
  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Y);
  Expr *temp3 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Z);
  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);
  spanSet(&A,&X,&Z); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);

}
term(A) ::= INTEGER|FLOAT|BLOB(X). {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
term(A) ::= STRING(X).             {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
expr(A) ::= VARIABLE(X).     {
  Token t = X; /*A-overwrites-X*/
  if( t.n>=2 && t.z[0]=='#' && sqlite3Isdigit(t.z[1]) ){
    /* When doing a nested parse, one can include terms in an expression
    ** that look like this:   #1 #2 ...  These terms refer to registers
    ** in the virtual machine.  #N is the N-th register. */
    spanSet(&A, &t, &t);
    if( pParse->nested==0 ){
      sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &t);
      A.pExpr = 0;
    }else{
      A.pExpr = sqlite3PExpr(pParse, TK_REGISTER, 0, 0, &t);
      if( A.pExpr ) sqlite3GetInt32(&t.z[1], &A.pExpr->iTable);
    }
  }else{
    spanExpr(&A, pParse, TK_VARIABLE, t);
    sqlite3ExprAssignVarNumber(pParse, A.pExpr);
  }

}
expr(A) ::= expr(A) COLLATE ids(C). {
  A.pExpr = sqlite3ExprAddCollateToken(pParse, A.pExpr, &C, 1);

  A.zEnd = &C.z[C.n];
}
%ifndef SQLITE_OMIT_CAST
expr(A) ::= CAST(X) LP expr(E) AS typetoken(T) RP(Y). {
  spanSet(&A,&X,&Y); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_CAST, E.pExpr, 0, &T);

}
%endif  SQLITE_OMIT_CAST
expr(A) ::= id(X) LP distinct(D) exprlist(Y) RP(E). {
  if( Y && Y->nExpr>pParse->db->aLimit[SQLITE_LIMIT_FUNCTION_ARG] ){
    sqlite3ErrorMsg(pParse, "too many arguments on function %T", &X);
  }
  A.pExpr = sqlite3ExprFunction(pParse, Y, &X);
................................................................................
}

%include {
  /* This routine constructs a binary expression node out of two ExprSpan
  ** objects and uses the result to populate a new ExprSpan object.
  */
  static void spanBinaryExpr(

    Parse *pParse,      /* The parsing context.  Errors accumulate here */
    int op,             /* The binary operation */
    ExprSpan *pLeft,    /* The left operand, and output */
    ExprSpan *pRight    /* The right operand */
  ){
    pLeft->pExpr = sqlite3PExpr(pParse, op, pLeft->pExpr, pRight->pExpr, 0);

    pLeft->zEnd = pRight->zEnd;
  }

  /* If doNot is true, then add a TK_NOT Expr-node wrapper around the
  ** outside of *ppExpr.
  */
  static void exprNot(Parse *pParse, int doNot, ExprSpan *pSpan){
    if( doNot ){
      pSpan->pExpr = sqlite3PExpr(pParse, TK_NOT, pSpan->pExpr, 0, 0);
    }
  }
}

expr(A) ::= expr(A) AND(OP) expr(Y).    {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) OR(OP) expr(Y).     {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) LT|GT|GE|LE(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) EQ|NE(OP) expr(Y).  {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) BITAND|BITOR|LSHIFT|RSHIFT(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) PLUS|MINUS(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) STAR|SLASH|REM(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) CONCAT(OP) expr(Y). {spanBinaryExpr(pParse,@OP,&A,&Y);}
%type likeop {struct LikeOp}
likeop(A) ::= LIKE_KW|MATCH(X). {A.eOperator = X; A.bNot = 0;/*A-overwrites-X*/}
likeop(A) ::= NOT LIKE_KW|MATCH(X). {A.eOperator = X; A.bNot = 1;}
expr(A) ::= expr(A) likeop(OP) expr(Y).  [LIKE_KW]  {
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, A.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  exprNot(pParse, OP.bNot, &A);

  A.zEnd = Y.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}
expr(A) ::= expr(A) likeop(OP) expr(Y) ESCAPE expr(E).  [LIKE_KW]  {
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, A.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, E.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  exprNot(pParse, OP.bNot, &A);

  A.zEnd = E.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}

%include {
  /* Construct an expression node for a unary postfix operator
  */
  static void spanUnaryPostfix(

    Parse *pParse,         /* Parsing context to record errors */
    int op,                /* The operator */
    ExprSpan *pOperand,    /* The operand, and output */
    Token *pPostOp         /* The operand token for setting the span */
  ){
    pOperand->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0, 0);

    pOperand->zEnd = &pPostOp->z[pPostOp->n];
  }                           
}

expr(A) ::= expr(A) ISNULL|NOTNULL(E).   {spanUnaryPostfix(pParse,@E,&A,&E);}
expr(A) ::= expr(A) NOT NULL(E). {spanUnaryPostfix(pParse,TK_NOTNULL,&A,&E);}

%include {
  /* A routine to convert a binary TK_IS or TK_ISNOT expression into a
  ** unary TK_ISNULL or TK_NOTNULL expression. */
  static void binaryToUnaryIfNull(Parse *pParse, Expr *pY, Expr *pA, int op){
    sqlite3 *db = pParse->db;
    if( pA && pY && pY->op==TK_NULL ){
................................................................................

//    expr1 IS expr2
//    expr1 IS NOT expr2
//
// If expr2 is NULL then code as TK_ISNULL or TK_NOTNULL.  If expr2
// is any other expression, code as TK_IS or TK_ISNOT.
// 
expr(A) ::= expr(A) IS expr(Y).     {
  spanBinaryExpr(pParse,TK_IS,&A,&Y);
  binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_ISNULL);
}
expr(A) ::= expr(A) IS NOT expr(Y). {
  spanBinaryExpr(pParse,TK_ISNOT,&A,&Y);
  binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_NOTNULL);
}

%include {
  /* Construct an expression node for a unary prefix operator
  */
  static void spanUnaryPrefix(
    ExprSpan *pOut,        /* Write the new expression node here */
    Parse *pParse,         /* Parsing context to record errors */
    int op,                /* The operator */
    ExprSpan *pOperand,    /* The operand */
    Token *pPreOp         /* The operand token for setting the span */
  ){

    pOut->zStart = pPreOp->z;
    pOut->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0, 0);
    pOut->zEnd = pOperand->zEnd;
  }
}



expr(A) ::= NOT(B) expr(X).  
              {spanUnaryPrefix(&A,pParse,@B,&X,&B);/*A-overwrites-B*/}
expr(A) ::= BITNOT(B) expr(X).
              {spanUnaryPrefix(&A,pParse,@B,&X,&B);/*A-overwrites-B*/}
expr(A) ::= MINUS(B) expr(X). [BITNOT]
              {spanUnaryPrefix(&A,pParse,TK_UMINUS,&X,&B);/*A-overwrites-B*/}
expr(A) ::= PLUS(B) expr(X). [BITNOT]
              {spanUnaryPrefix(&A,pParse,TK_UPLUS,&X,&B);/*A-overwrites-B*/}

%type between_op {int}
between_op(A) ::= BETWEEN.     {A = 0;}
between_op(A) ::= NOT BETWEEN. {A = 1;}
expr(A) ::= expr(A) between_op(N) expr(X) AND expr(Y). [BETWEEN] {
  ExprList *pList = sqlite3ExprListAppend(pParse,0, X.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, Y.pExpr);
  A.pExpr = sqlite3PExpr(pParse, TK_BETWEEN, A.pExpr, 0, 0);
  if( A.pExpr ){
    A.pExpr->x.pList = pList;
  }else{
    sqlite3ExprListDelete(pParse->db, pList);
  } 
  exprNot(pParse, N, &A);

  A.zEnd = Y.zEnd;
}
%ifndef SQLITE_OMIT_SUBQUERY
  %type in_op {int}
  in_op(A) ::= IN.      {A = 0;}
  in_op(A) ::= NOT IN.  {A = 1;}
  expr(A) ::= expr(A) in_op(N) LP exprlist(Y) RP(E). [IN] {
    if( Y==0 ){
      /* Expressions of the form
      **
      **      expr1 IN ()
      **      expr1 NOT IN ()
      **
      ** simplify to constants 0 (false) and 1 (true), respectively,
      ** regardless of the value of expr1.
      */
      sqlite3ExprDelete(pParse->db, A.pExpr);
      A.pExpr = sqlite3PExpr(pParse, TK_INTEGER, 0, 0, &sqlite3IntTokens[N]);

    }else if( Y->nExpr==1 ){
      /* Expressions of the form:
      **
      **      expr1 IN (?1)
      **      expr1 NOT IN (?2)
      **
      ** with exactly one value on the RHS can be simplified to something
................................................................................
      sqlite3ExprListDelete(pParse->db, Y);
      /* pRHS cannot be NULL because a malloc error would have been detected
      ** before now and control would have never reached this point */
      if( ALWAYS(pRHS) ){
        pRHS->flags &= ~EP_Collate;
        pRHS->flags |= EP_Generic;
      }
      A.pExpr = sqlite3PExpr(pParse, N ? TK_NE : TK_EQ, A.pExpr, pRHS, 0);
    }else{
      A.pExpr = sqlite3PExpr(pParse, TK_IN, A.pExpr, 0, 0);
      if( A.pExpr ){
        A.pExpr->x.pList = Y;
        sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
      }else{
        sqlite3ExprListDelete(pParse->db, Y);
      }
      exprNot(pParse, N, &A);
    }

    A.zEnd = &E.z[E.n];
  }
  expr(A) ::= LP(B) select(X) RP(E). {
    spanSet(&A,&B,&E); /*A-overwrites-B*/
    A.pExpr = sqlite3PExpr(pParse, TK_SELECT, 0, 0, 0);
    if( A.pExpr ){
      A.pExpr->x.pSelect = X;
      ExprSetProperty(A.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
    }else{
      sqlite3SelectDelete(pParse->db, X);
    }


  }
  expr(A) ::= expr(A) in_op(N) LP select(Y) RP(E).  [IN] {
    A.pExpr = sqlite3PExpr(pParse, TK_IN, A.pExpr, 0, 0);
    if( A.pExpr ){
      A.pExpr->x.pSelect = Y;
      ExprSetProperty(A.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
    }else{
      sqlite3SelectDelete(pParse->db, Y);
    }
    exprNot(pParse, N, &A);

    A.zEnd = &E.z[E.n];
  }
  expr(A) ::= expr(A) in_op(N) nm(Y) dbnm(Z). [IN] {
    SrcList *pSrc = sqlite3SrcListAppend(pParse->db, 0,&Y,&Z);
    A.pExpr = sqlite3PExpr(pParse, TK_IN, A.pExpr, 0, 0);
    if( A.pExpr ){
      A.pExpr->x.pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0,0);
      ExprSetProperty(A.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
    }else{
      sqlite3SrcListDelete(pParse->db, pSrc);
    }
    exprNot(pParse, N, &A);

    A.zEnd = Z.z ? &Z.z[Z.n] : &Y.z[Y.n];
  }
  expr(A) ::= EXISTS(B) LP select(Y) RP(E). {
    Expr *p;
    spanSet(&A,&B,&E); /*A-overwrites-B*/
    p = A.pExpr = sqlite3PExpr(pParse, TK_EXISTS, 0, 0, 0);
    if( p ){
      p->x.pSelect = Y;
      ExprSetProperty(p, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, p);
    }else{
      sqlite3SelectDelete(pParse->db, Y);
    }


  }
%endif SQLITE_OMIT_SUBQUERY

/* CASE expressions */
expr(A) ::= CASE(C) case_operand(X) case_exprlist(Y) case_else(Z) END(E). {
  spanSet(&A,&C,&E);  /*A-overwrites-C*/
  A.pExpr = sqlite3PExpr(pParse, TK_CASE, X, 0, 0);
  if( A.pExpr ){
    A.pExpr->x.pList = Z ? sqlite3ExprListAppend(pParse,Y,Z) : Y;
    sqlite3ExprSetHeightAndFlags(pParse, A.pExpr);
  }else{
    sqlite3ExprListDelete(pParse->db, Y);
    sqlite3ExprDelete(pParse->db, Z);
  }


}
%type case_exprlist {ExprList*}
%destructor case_exprlist {sqlite3ExprListDelete(pParse->db, $$);}
case_exprlist(A) ::= case_exprlist(A) WHEN expr(Y) THEN expr(Z). {
  A = sqlite3ExprListAppend(pParse,A, Y.pExpr);
  A = sqlite3ExprListAppend(pParse,A, Z.pExpr);
}
case_exprlist(A) ::= WHEN expr(Y) THEN expr(Z). {
  A = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  A = sqlite3ExprListAppend(pParse,A, Z.pExpr);
}
%type case_else {Expr*}
%destructor case_else {sqlite3ExprDelete(pParse->db, $$);}
case_else(A) ::=  ELSE expr(X).         {A = X.pExpr;}
case_else(A) ::=  .                     {A = 0;} 
%type case_operand {Expr*}
%destructor case_operand {sqlite3ExprDelete(pParse->db, $$);}
case_operand(A) ::= expr(X).            {A = X.pExpr; /*A-overwrites-X*/} 
case_operand(A) ::= .                   {A = 0;} 

%type exprlist {ExprList*}
%destructor exprlist {sqlite3ExprListDelete(pParse->db, $$);}
%type nexprlist {ExprList*}
%destructor nexprlist {sqlite3ExprListDelete(pParse->db, $$);}

exprlist(A) ::= nexprlist(A).
exprlist(A) ::= .                            {A = 0;}
nexprlist(A) ::= nexprlist(A) COMMA expr(Y).
    {A = sqlite3ExprListAppend(pParse,A,Y.pExpr);}
nexprlist(A) ::= expr(Y).
    {A = sqlite3ExprListAppend(pParse,0,Y.pExpr); /*A-overwrites-Y*/}


///////////////////////////// The CREATE INDEX command ///////////////////////
//
cmd ::= createkw(S) uniqueflag(U) INDEX ifnotexists(NE) nm(X) dbnm(D)
        ON nm(Y) LP sortlist(Z) RP where_opt(W). {
  sqlite3CreateIndex(pParse, &X, &D, 
................................................................................
    sqlite3ExprListSetName(pParse, p, pIdToken, 1);
    return p;
  }
} // end %include

eidlist_opt(A) ::= .                         {A = 0;}
eidlist_opt(A) ::= LP eidlist(X) RP.         {A = X;}
eidlist(A) ::= eidlist(A) COMMA nm(Y) collate(C) sortorder(Z).  {
  A = parserAddExprIdListTerm(pParse, A, &Y, C, Z);
}
eidlist(A) ::= nm(Y) collate(C) sortorder(Z). {
  A = parserAddExprIdListTerm(pParse, 0, &Y, C, Z); /*A-overwrites-Y*/
}

%type collate {int}
collate(C) ::= .              {C = 0;}
collate(C) ::= COLLATE ids.   {C = 1;}


................................................................................
cmd ::= PRAGMA nm(X) dbnm(Z) EQ nmnum(Y).    {sqlite3Pragma(pParse,&X,&Z,&Y,0);}
cmd ::= PRAGMA nm(X) dbnm(Z) LP nmnum(Y) RP. {sqlite3Pragma(pParse,&X,&Z,&Y,0);}
cmd ::= PRAGMA nm(X) dbnm(Z) EQ minus_num(Y). 
                                             {sqlite3Pragma(pParse,&X,&Z,&Y,1);}
cmd ::= PRAGMA nm(X) dbnm(Z) LP minus_num(Y) RP.
                                             {sqlite3Pragma(pParse,&X,&Z,&Y,1);}

nmnum(A) ::= plus_num(A).
nmnum(A) ::= nm(A).
nmnum(A) ::= ON(A).
nmnum(A) ::= DELETE(A).
nmnum(A) ::= DEFAULT(A).
%endif SQLITE_OMIT_PRAGMA
%token_class number INTEGER|FLOAT.
plus_num(A) ::= PLUS number(X).       {A = X;}
plus_num(A) ::= number(A).
minus_num(A) ::= MINUS number(X).     {A = X;}
//////////////////////////// The CREATE TRIGGER command /////////////////////

%ifndef SQLITE_OMIT_TRIGGER

cmd ::= createkw trigger_decl(A) BEGIN trigger_cmd_list(S) END(Z). {
  Token all;
................................................................................
  sqlite3FinishTrigger(pParse, S, &all);
}

trigger_decl(A) ::= temp(T) TRIGGER ifnotexists(NOERR) nm(B) dbnm(Z) 
                    trigger_time(C) trigger_event(D)
                    ON fullname(E) foreach_clause when_clause(G). {
  sqlite3BeginTrigger(pParse, &B, &Z, C, D.a, D.b, E, G, T, NOERR);
  A = (Z.n==0?B:Z); /*A-overwrites-T*/
}

%type trigger_time {int}
trigger_time(A) ::= BEFORE.      { A = TK_BEFORE; }
trigger_time(A) ::= AFTER.       { A = TK_AFTER;  }
trigger_time(A) ::= INSTEAD OF.  { A = TK_INSTEAD;}
trigger_time(A) ::= .            { A = TK_BEFORE; }

%type trigger_event {struct TrigEvent}
%destructor trigger_event {sqlite3IdListDelete(pParse->db, $$.b);}
trigger_event(A) ::= DELETE|INSERT(X).   {A.a = @X; /*A-overwrites-X*/ A.b = 0;}
trigger_event(A) ::= UPDATE(X).          {A.a = @X; /*A-overwrites-X*/ A.b = 0;}
trigger_event(A) ::= UPDATE OF idlist(X).{A.a = TK_UPDATE; A.b = X;}

foreach_clause ::= .
foreach_clause ::= FOR EACH ROW.

%type when_clause {Expr*}
%destructor when_clause {sqlite3ExprDelete(pParse->db, $$);}
when_clause(A) ::= .             { A = 0; }
when_clause(A) ::= WHEN expr(X). { A = X.pExpr; }

%type trigger_cmd_list {TriggerStep*}
%destructor trigger_cmd_list {sqlite3DeleteTriggerStep(pParse->db, $$);}
trigger_cmd_list(A) ::= trigger_cmd_list(A) trigger_cmd(X) SEMI. {
  assert( A!=0 );
  A->pLast->pNext = X;
  A->pLast = X;

}
trigger_cmd_list(A) ::= trigger_cmd(A) SEMI. { 
  assert( A!=0 );
  A->pLast = A;

}

// Disallow qualified table names on INSERT, UPDATE, and DELETE statements
// within a trigger.  The table to INSERT, UPDATE, or DELETE is always in 
// the same database as the table that the trigger fires on.
//
%type trnm {Token}
trnm(A) ::= nm(A).
trnm(A) ::= nm DOT nm(X). {
  A = X;
  sqlite3ErrorMsg(pParse, 
        "qualified table names are not allowed on INSERT, UPDATE, and DELETE "
        "statements within triggers");
}

................................................................................


%type trigger_cmd {TriggerStep*}
%destructor trigger_cmd {sqlite3DeleteTriggerStep(pParse->db, $$);}
// UPDATE 
trigger_cmd(A) ::=
   UPDATE orconf(R) trnm(X) tridxby SET setlist(Y) where_opt(Z).  
   {A = sqlite3TriggerUpdateStep(pParse->db, &X, Y, Z, R);}

// INSERT
trigger_cmd(A) ::= insert_cmd(R) INTO trnm(X) idlist_opt(F) select(S).
   {A = sqlite3TriggerInsertStep(pParse->db, &X, F, S, R);/*A-overwrites-R*/}

// DELETE
trigger_cmd(A) ::= DELETE FROM trnm(X) tridxby where_opt(Y).
   {A = sqlite3TriggerDeleteStep(pParse->db, &X, Y);}

// SELECT
trigger_cmd(A) ::= select(X).
   {A = sqlite3TriggerSelectStep(pParse->db, X); /*A-overwrites-X*/}

// The special RAISE expression that may occur in trigger programs
expr(A) ::= RAISE(X) LP IGNORE RP(Y).  {
  spanSet(&A,&X,&Y);  /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_RAISE, 0, 0, 0); 
  if( A.pExpr ){
    A.pExpr->affinity = OE_Ignore;
  }


}
expr(A) ::= RAISE(X) LP raisetype(T) COMMA nm(Z) RP(Y).  {
  spanSet(&A,&X,&Y);  /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_RAISE, 0, 0, &Z); 
  if( A.pExpr ) {
    A.pExpr->affinity = (char)T;
  }


}
%endif  !SQLITE_OMIT_TRIGGER

%type raisetype {int}
raisetype(A) ::= ROLLBACK.  {A = OE_Rollback;}
raisetype(A) ::= ABORT.     {A = OE_Abort;}
raisetype(A) ::= FAIL.      {A = OE_Fail;}
................................................................................

with(A) ::= . {A = 0;}
%ifndef SQLITE_OMIT_CTE
with(A) ::= WITH wqlist(W).              { A = W; }
with(A) ::= WITH RECURSIVE wqlist(W).    { A = W; }

wqlist(A) ::= nm(X) eidlist_opt(Y) AS LP select(Z) RP. {
  A = sqlite3WithAdd(pParse, 0, &X, Y, Z); /*A-overwrites-X*/
}
wqlist(A) ::= wqlist(A) COMMA nm(X) eidlist_opt(Y) AS LP select(Z) RP. {
  A = sqlite3WithAdd(pParse, A, &X, Y, Z);
}
%endif  SQLITE_OMIT_CTE

  assert( pCache->nRefSum==0 && pCache->pDirty==0 );
  if( pCache->szPage ){
    sqlite3_pcache *pNew;
    pNew = sqlite3GlobalConfig.pcache2.xCreate(
                szPage, pCache->szExtra + ROUND8(sizeof(PgHdr)),
                pCache->bPurgeable
    );
    if( pNew==0 ) return SQLITE_NOMEM;
    sqlite3GlobalConfig.pcache2.xCachesize(pNew, numberOfCachePages(pCache));
    if( pCache->pCache ){
      sqlite3GlobalConfig.pcache2.xDestroy(pCache->pCache);
    }
    pCache->pCache = pNew;
    pCache->szPage = szPage;
  }
................................................................................
      rc = pCache->xStress(pCache->pStress, pPg);
      if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
        return rc;
      }
    }
  }
  *ppPage = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, 2);
  return *ppPage==0 ? SQLITE_NOMEM : SQLITE_OK;
}

/*
** This is a helper routine for sqlite3PcacheFetchFinish()
**
** In the uncommon case where the page being fetched has not been
** initialized, this routine is invoked to do the initialization.

  assert( pCache->nRefSum==0 && pCache->pDirty==0 );
  if( pCache->szPage ){
    sqlite3_pcache *pNew;
    pNew = sqlite3GlobalConfig.pcache2.xCreate(
                szPage, pCache->szExtra + ROUND8(sizeof(PgHdr)),
                pCache->bPurgeable
    );
    if( pNew==0 ) return SQLITE_NOMEM_BKPT;
    sqlite3GlobalConfig.pcache2.xCachesize(pNew, numberOfCachePages(pCache));
    if( pCache->pCache ){
      sqlite3GlobalConfig.pcache2.xDestroy(pCache->pCache);
    }
    pCache->pCache = pNew;
    pCache->szPage = szPage;
  }
................................................................................
      rc = pCache->xStress(pCache->pStress, pPg);
      if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
        return rc;
      }
    }
  }
  *ppPage = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, 2);
  return *ppPage==0 ? SQLITE_NOMEM_BKPT : SQLITE_OK;
}

/*
** This is a helper routine for sqlite3PcacheFetchFinish()
**
** In the uncommon case where the page being fetched has not been
** initialized, this routine is invoked to do the initialization.

    char *z;
    if( zObj==0 ) zObj = "?";
    z = sqlite3MPrintf(db, "malformed database schema (%s)", zObj);
    if( zExtra ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra);
    sqlite3DbFree(db, *pData->pzErrMsg);
    *pData->pzErrMsg = z;
  }
  pData->rc = db->mallocFailed ? SQLITE_NOMEM : SQLITE_CORRUPT_BKPT;
}

/*
** This is the callback routine for the code that initializes the
** database.  See sqlite3Init() below for additional information.
** This routine is also called from the OP_ParseSchema opcode of the VDBE.
**
................................................................................
#ifndef SQLITE_OMIT_ANALYZE
    if( rc==SQLITE_OK ){
      sqlite3AnalysisLoad(db, iDb);
    }
#endif
  }
  if( db->mallocFailed ){
    rc = SQLITE_NOMEM;
    sqlite3ResetAllSchemasOfConnection(db);
  }
  if( rc==SQLITE_OK || (db->flags&SQLITE_RecoveryMode)){
    /* Black magic: If the SQLITE_RecoveryMode flag is set, then consider
    ** the schema loaded, even if errors occurred. In this situation the 
    ** current sqlite3_prepare() operation will fail, but the following one
    ** will attempt to compile the supplied statement against whatever subset
................................................................................
  char *zErrMsg = 0;        /* Error message */
  int rc = SQLITE_OK;       /* Result code */
  int i;                    /* Loop counter */

  /* Allocate the parsing context */
  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
  if( pParse==0 ){
    rc = SQLITE_NOMEM;
    goto end_prepare;
  }
  pParse->pReprepare = pReprepare;
  assert( ppStmt && *ppStmt==0 );
  /* assert( !db->mallocFailed ); // not true with SQLITE_USE_ALLOCA */
  assert( sqlite3_mutex_held(db->mutex) );

................................................................................
  assert( 0==pParse->nQueryLoop );

  if( pParse->rc==SQLITE_DONE ) pParse->rc = SQLITE_OK;
  if( pParse->checkSchema ){
    schemaIsValid(pParse);
  }
  if( db->mallocFailed ){
    pParse->rc = SQLITE_NOMEM;
  }
  if( pzTail ){
    *pzTail = pParse->zTail;
  }
  rc = pParse->rc;

#ifndef SQLITE_OMIT_EXPLAIN

    char *z;
    if( zObj==0 ) zObj = "?";
    z = sqlite3MPrintf(db, "malformed database schema (%s)", zObj);
    if( zExtra ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra);
    sqlite3DbFree(db, *pData->pzErrMsg);
    *pData->pzErrMsg = z;
  }
  pData->rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_CORRUPT_BKPT;
}

/*
** This is the callback routine for the code that initializes the
** database.  See sqlite3Init() below for additional information.
** This routine is also called from the OP_ParseSchema opcode of the VDBE.
**
................................................................................
#ifndef SQLITE_OMIT_ANALYZE
    if( rc==SQLITE_OK ){
      sqlite3AnalysisLoad(db, iDb);
    }
#endif
  }
  if( db->mallocFailed ){
    rc = SQLITE_NOMEM_BKPT;
    sqlite3ResetAllSchemasOfConnection(db);
  }
  if( rc==SQLITE_OK || (db->flags&SQLITE_RecoveryMode)){
    /* Black magic: If the SQLITE_RecoveryMode flag is set, then consider
    ** the schema loaded, even if errors occurred. In this situation the 
    ** current sqlite3_prepare() operation will fail, but the following one
    ** will attempt to compile the supplied statement against whatever subset
................................................................................
  char *zErrMsg = 0;        /* Error message */
  int rc = SQLITE_OK;       /* Result code */
  int i;                    /* Loop counter */

  /* Allocate the parsing context */
  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
  if( pParse==0 ){
    rc = SQLITE_NOMEM_BKPT;
    goto end_prepare;
  }
  pParse->pReprepare = pReprepare;
  assert( ppStmt && *ppStmt==0 );
  /* assert( !db->mallocFailed ); // not true with SQLITE_USE_ALLOCA */
  assert( sqlite3_mutex_held(db->mutex) );

................................................................................
  assert( 0==pParse->nQueryLoop );

  if( pParse->rc==SQLITE_DONE ) pParse->rc = SQLITE_OK;
  if( pParse->checkSchema ){
    schemaIsValid(pParse);
  }
  if( db->mallocFailed ){
    pParse->rc = SQLITE_NOMEM_BKPT;
  }
  if( pzTail ){
    *pzTail = pParse->zTail;
  }
  rc = pParse->rc;

#ifndef SQLITE_OMIT_EXPLAIN

      FuncDef *pDef;              /* Information about the function */
      u8 enc = ENC(pParse->db);   /* The database encoding */

      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      notValid(pParse, pNC, "functions", NC_PartIdx);
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(pParse->db, zId, nId, n, enc, 0);
      if( pDef==0 ){
        pDef = sqlite3FindFunction(pParse->db, zId, nId, -2, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
        }else{
          wrong_num_args = 1;
        }
      }else{
        is_agg = pDef->xFinalize!=0;

      FuncDef *pDef;              /* Information about the function */
      u8 enc = ENC(pParse->db);   /* The database encoding */

      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      notValid(pParse, pNC, "functions", NC_PartIdx);
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(pParse->db, zId, n, enc, 0);
      if( pDef==0 ){
        pDef = sqlite3FindFunction(pParse->db, zId, -2, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
        }else{
          wrong_num_args = 1;
        }
      }else{
        is_agg = pDef->xFinalize!=0;

  Parse *pParse,        /* Parsing context */
  ExprList *pEList,     /* which columns to include in the result */
  SrcList *pSrc,        /* the FROM clause -- which tables to scan */
  Expr *pWhere,         /* the WHERE clause */
  ExprList *pGroupBy,   /* the GROUP BY clause */
  Expr *pHaving,        /* the HAVING clause */
  ExprList *pOrderBy,   /* the ORDER BY clause */
  u16 selFlags,         /* Flag parameters, such as SF_Distinct */
  Expr *pLimit,         /* LIMIT value.  NULL means not used */
  Expr *pOffset         /* OFFSET value.  NULL means no offset */
){
  Select *pNew;
  Select standin;
  sqlite3 *db = pParse->db;
  pNew = sqlite3DbMallocRawNN(db, sizeof(*pNew) );
................................................................................
  if( db->mallocFailed ){
    for(j=0; j<i; j++){
      sqlite3DbFree(db, aCol[j].zName);
    }
    sqlite3DbFree(db, aCol);
    *paCol = 0;
    *pnCol = 0;
    return SQLITE_NOMEM;
  }
  return SQLITE_OK;
}

/*
** Add type and collation information to a column list based on
** a SELECT statement.
................................................................................
    v = sqlite3GetVdbe(pParse);
    assert( v!=0 );
    if( sqlite3ExprIsInteger(p->pLimit, &n) ){
      sqlite3VdbeAddOp2(v, OP_Integer, n, iLimit);
      VdbeComment((v, "LIMIT counter"));
      if( n==0 ){
        sqlite3VdbeGoto(v, iBreak);
      }else if( n>=0 && p->nSelectRow>(u64)n ){
        p->nSelectRow = n;

      }
    }else{
      sqlite3ExprCode(pParse, p->pLimit, iLimit);
      sqlite3VdbeAddOp1(v, OP_MustBeInt, iLimit); VdbeCoverage(v);
      VdbeComment((v, "LIMIT counter"));
      sqlite3VdbeAddOp2(v, OP_IfNot, iLimit, iBreak); VdbeCoverage(v);
    }
................................................................................
        }
      }
      explainSetInteger(iSub2, pParse->iNextSelectId);
      rc = sqlite3Select(pParse, p, &dest);
      testcase( rc!=SQLITE_OK );
      pDelete = p->pPrior;
      p->pPrior = pPrior;
      p->nSelectRow += pPrior->nSelectRow;
      if( pPrior->pLimit
       && sqlite3ExprIsInteger(pPrior->pLimit, &nLimit)
       && nLimit>0 && p->nSelectRow > (u64)nLimit 
      ){
        p->nSelectRow = nLimit;
      }
      if( addr ){
        sqlite3VdbeJumpHere(v, addr);
      }
      break;
    }
    case TK_EXCEPT:
................................................................................
      testcase( rc!=SQLITE_OK );
      /* Query flattening in sqlite3Select() might refill p->pOrderBy.
      ** Be sure to delete p->pOrderBy, therefore, to avoid a memory leak. */
      sqlite3ExprListDelete(db, p->pOrderBy);
      pDelete = p->pPrior;
      p->pPrior = pPrior;
      p->pOrderBy = 0;
      if( p->op==TK_UNION ) p->nSelectRow += pPrior->nSelectRow;


      sqlite3ExprDelete(db, p->pLimit);
      p->pLimit = pLimit;
      p->pOffset = pOffset;
      p->iLimit = 0;
      p->iOffset = 0;

      /* Convert the data in the temporary table into whatever form
................................................................................
    CollSeq **apColl;             /* For looping through pKeyInfo->aColl[] */
    int nCol;                     /* Number of columns in result set */

    assert( p->pNext==0 );
    nCol = p->pEList->nExpr;
    pKeyInfo = sqlite3KeyInfoAlloc(db, nCol, 1);
    if( !pKeyInfo ){
      rc = SQLITE_NOMEM;
      goto multi_select_end;
    }
    for(i=0, apColl=pKeyInfo->aColl; i<nCol; i++, apColl++){
      *apColl = multiSelectCollSeq(pParse, p, i);
      if( 0==*apColl ){
        *apColl = db->pDfltColl;
      }
................................................................................
      struct ExprList_item *pItem;
      for(j=0, pItem=pOrderBy->a; j<nOrderBy; j++, pItem++){
        assert( pItem->u.x.iOrderByCol>0 );
        if( pItem->u.x.iOrderByCol==i ) break;
      }
      if( j==nOrderBy ){
        Expr *pNew = sqlite3Expr(db, TK_INTEGER, 0);
        if( pNew==0 ) return SQLITE_NOMEM;
        pNew->flags |= EP_IntValue;
        pNew->u.iValue = i;
        pOrderBy = sqlite3ExprListAppend(pParse, pOrderBy, pNew);
        if( pOrderBy ) pOrderBy->a[nOrderBy++].u.x.iOrderByCol = (u16)i;
      }
    }
  }
................................................................................
    addrEofA_noB = addrEofA = labelEnd;
  }else{  
    VdbeNoopComment((v, "eof-A subroutine"));
    addrEofA = sqlite3VdbeAddOp2(v, OP_Gosub, regOutB, addrOutB);
    addrEofA_noB = sqlite3VdbeAddOp2(v, OP_Yield, regAddrB, labelEnd);
                                     VdbeCoverage(v);
    sqlite3VdbeGoto(v, addrEofA);
    p->nSelectRow += pPrior->nSelectRow;
  }

  /* Generate a subroutine to run when the results from select B
  ** are exhausted and only data in select A remains.
  */
  if( op==TK_INTERSECT ){
    addrEofB = addrEofA;
................................................................................
    if( pTab==0 ) return WRC_Abort;
    pTab->nRef = 1;
    pTab->zName = sqlite3DbStrDup(db, pCte->zName);
    pTab->iPKey = -1;
    pTab->nRowLogEst = 200; assert( 200==sqlite3LogEst(1048576) );
    pTab->tabFlags |= TF_Ephemeral | TF_NoVisibleRowid;
    pFrom->pSelect = sqlite3SelectDup(db, pCte->pSelect, 0);
    if( db->mallocFailed ) return SQLITE_NOMEM;
    assert( pFrom->pSelect );

    /* Check if this is a recursive CTE. */
    pSel = pFrom->pSelect;
    bMayRecursive = ( pSel->op==TK_ALL || pSel->op==TK_UNION );
    if( bMayRecursive ){
      int i;
................................................................................
      pItem->regReturn = ++pParse->nMem;
      sqlite3VdbeAddOp3(v, OP_InitCoroutine, pItem->regReturn, 0, addrTop);
      VdbeComment((v, "%s", pItem->pTab->zName));
      pItem->addrFillSub = addrTop;
      sqlite3SelectDestInit(&dest, SRT_Coroutine, pItem->regReturn);
      explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);
      sqlite3Select(pParse, pSub, &dest);
      pItem->pTab->nRowLogEst = sqlite3LogEst(pSub->nSelectRow);
      pItem->fg.viaCoroutine = 1;
      pItem->regResult = dest.iSdst;
      sqlite3VdbeEndCoroutine(v, pItem->regReturn);
      sqlite3VdbeJumpHere(v, addrTop-1);
      sqlite3ClearTempRegCache(pParse);
    }else{
      /* Generate a subroutine that will fill an ephemeral table with
................................................................................
        VdbeComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }else{
        VdbeNoopComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }
      sqlite3SelectDestInit(&dest, SRT_EphemTab, pItem->iCursor);
      explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);
      sqlite3Select(pParse, pSub, &dest);
      pItem->pTab->nRowLogEst = sqlite3LogEst(pSub->nSelectRow);
      if( onceAddr ) sqlite3VdbeJumpHere(v, onceAddr);
      retAddr = sqlite3VdbeAddOp1(v, OP_Return, pItem->regReturn);
      VdbeComment((v, "end %s", pItem->pTab->zName));
      sqlite3VdbeChangeP1(v, topAddr, retAddr);
      sqlite3ClearTempRegCache(pParse);
    }
    if( db->mallocFailed ) goto select_end;
................................................................................
  if( pDest->eDest==SRT_EphemTab ){
    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pDest->iSDParm, pEList->nExpr);
  }

  /* Set the limiter.
  */
  iEnd = sqlite3VdbeMakeLabel(v);
  p->nSelectRow = LARGEST_INT64;
  computeLimitRegisters(pParse, p, iEnd);
  if( p->iLimit==0 && sSort.addrSortIndex>=0 ){
    sqlite3VdbeChangeOpcode(v, sSort.addrSortIndex, OP_SorterOpen);
    sSort.sortFlags |= SORTFLAG_UseSorter;
  }

  /* Open an ephemeral index to use for the distinct set.
................................................................................
  }else{
    sDistinct.eTnctType = WHERE_DISTINCT_NOOP;
  }

  if( !isAgg && pGroupBy==0 ){
    /* No aggregate functions and no GROUP BY clause */
    u16 wctrlFlags = (sDistinct.isTnct ? WHERE_WANT_DISTINCT : 0);



    /* Begin the database scan. */
    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, sSort.pOrderBy,
                               p->pEList, wctrlFlags, 0);
    if( pWInfo==0 ) goto select_end;
    if( sqlite3WhereOutputRowCount(pWInfo) < p->nSelectRow ){
      p->nSelectRow = sqlite3WhereOutputRowCount(pWInfo);
    }
    if( sDistinct.isTnct && sqlite3WhereIsDistinct(pWInfo) ){
      sDistinct.eTnctType = sqlite3WhereIsDistinct(pWInfo);
    }
................................................................................

      for(k=p->pEList->nExpr, pItem=p->pEList->a; k>0; k--, pItem++){
        pItem->u.x.iAlias = 0;
      }
      for(k=pGroupBy->nExpr, pItem=pGroupBy->a; k>0; k--, pItem++){
        pItem->u.x.iAlias = 0;
      }

      if( p->nSelectRow>100 ) p->nSelectRow = 100;
    }else{

      p->nSelectRow = 1;
    }

    /* If there is both a GROUP BY and an ORDER BY clause and they are
    ** identical, then it may be possible to disable the ORDER BY clause 
    ** on the grounds that the GROUP BY will cause elements to come out 
    ** in the correct order. It also may not - the GROUP BY might use a
    ** database index that causes rows to be grouped together as required

  Parse *pParse,        /* Parsing context */
  ExprList *pEList,     /* which columns to include in the result */
  SrcList *pSrc,        /* the FROM clause -- which tables to scan */
  Expr *pWhere,         /* the WHERE clause */
  ExprList *pGroupBy,   /* the GROUP BY clause */
  Expr *pHaving,        /* the HAVING clause */
  ExprList *pOrderBy,   /* the ORDER BY clause */
  u32 selFlags,         /* Flag parameters, such as SF_Distinct */
  Expr *pLimit,         /* LIMIT value.  NULL means not used */
  Expr *pOffset         /* OFFSET value.  NULL means no offset */
){
  Select *pNew;
  Select standin;
  sqlite3 *db = pParse->db;
  pNew = sqlite3DbMallocRawNN(db, sizeof(*pNew) );
................................................................................
  if( db->mallocFailed ){
    for(j=0; j<i; j++){
      sqlite3DbFree(db, aCol[j].zName);
    }
    sqlite3DbFree(db, aCol);
    *paCol = 0;
    *pnCol = 0;
    return SQLITE_NOMEM_BKPT;
  }
  return SQLITE_OK;
}

/*
** Add type and collation information to a column list based on
** a SELECT statement.
................................................................................
    v = sqlite3GetVdbe(pParse);
    assert( v!=0 );
    if( sqlite3ExprIsInteger(p->pLimit, &n) ){
      sqlite3VdbeAddOp2(v, OP_Integer, n, iLimit);
      VdbeComment((v, "LIMIT counter"));
      if( n==0 ){
        sqlite3VdbeGoto(v, iBreak);
      }else if( n>=0 && p->nSelectRow>sqlite3LogEst((u64)n) ){
        p->nSelectRow = sqlite3LogEst((u64)n);
        p->selFlags |= SF_FixedLimit;
      }
    }else{
      sqlite3ExprCode(pParse, p->pLimit, iLimit);
      sqlite3VdbeAddOp1(v, OP_MustBeInt, iLimit); VdbeCoverage(v);
      VdbeComment((v, "LIMIT counter"));
      sqlite3VdbeAddOp2(v, OP_IfNot, iLimit, iBreak); VdbeCoverage(v);
    }
................................................................................
        }
      }
      explainSetInteger(iSub2, pParse->iNextSelectId);
      rc = sqlite3Select(pParse, p, &dest);
      testcase( rc!=SQLITE_OK );
      pDelete = p->pPrior;
      p->pPrior = pPrior;
      p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
      if( pPrior->pLimit
       && sqlite3ExprIsInteger(pPrior->pLimit, &nLimit)
       && nLimit>0 && p->nSelectRow > sqlite3LogEst((u64)nLimit) 
      ){
        p->nSelectRow = sqlite3LogEst((u64)nLimit);
      }
      if( addr ){
        sqlite3VdbeJumpHere(v, addr);
      }
      break;
    }
    case TK_EXCEPT:
................................................................................
      testcase( rc!=SQLITE_OK );
      /* Query flattening in sqlite3Select() might refill p->pOrderBy.
      ** Be sure to delete p->pOrderBy, therefore, to avoid a memory leak. */
      sqlite3ExprListDelete(db, p->pOrderBy);
      pDelete = p->pPrior;
      p->pPrior = pPrior;
      p->pOrderBy = 0;
      if( p->op==TK_UNION ){
        p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
      }
      sqlite3ExprDelete(db, p->pLimit);
      p->pLimit = pLimit;
      p->pOffset = pOffset;
      p->iLimit = 0;
      p->iOffset = 0;

      /* Convert the data in the temporary table into whatever form
................................................................................
    CollSeq **apColl;             /* For looping through pKeyInfo->aColl[] */
    int nCol;                     /* Number of columns in result set */

    assert( p->pNext==0 );
    nCol = p->pEList->nExpr;
    pKeyInfo = sqlite3KeyInfoAlloc(db, nCol, 1);
    if( !pKeyInfo ){
      rc = SQLITE_NOMEM_BKPT;
      goto multi_select_end;
    }
    for(i=0, apColl=pKeyInfo->aColl; i<nCol; i++, apColl++){
      *apColl = multiSelectCollSeq(pParse, p, i);
      if( 0==*apColl ){
        *apColl = db->pDfltColl;
      }
................................................................................
      struct ExprList_item *pItem;
      for(j=0, pItem=pOrderBy->a; j<nOrderBy; j++, pItem++){
        assert( pItem->u.x.iOrderByCol>0 );
        if( pItem->u.x.iOrderByCol==i ) break;
      }
      if( j==nOrderBy ){
        Expr *pNew = sqlite3Expr(db, TK_INTEGER, 0);
        if( pNew==0 ) return SQLITE_NOMEM_BKPT;
        pNew->flags |= EP_IntValue;
        pNew->u.iValue = i;
        pOrderBy = sqlite3ExprListAppend(pParse, pOrderBy, pNew);
        if( pOrderBy ) pOrderBy->a[nOrderBy++].u.x.iOrderByCol = (u16)i;
      }
    }
  }
................................................................................
    addrEofA_noB = addrEofA = labelEnd;
  }else{  
    VdbeNoopComment((v, "eof-A subroutine"));
    addrEofA = sqlite3VdbeAddOp2(v, OP_Gosub, regOutB, addrOutB);
    addrEofA_noB = sqlite3VdbeAddOp2(v, OP_Yield, regAddrB, labelEnd);
                                     VdbeCoverage(v);
    sqlite3VdbeGoto(v, addrEofA);
    p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
  }

  /* Generate a subroutine to run when the results from select B
  ** are exhausted and only data in select A remains.
  */
  if( op==TK_INTERSECT ){
    addrEofB = addrEofA;
................................................................................
    if( pTab==0 ) return WRC_Abort;
    pTab->nRef = 1;
    pTab->zName = sqlite3DbStrDup(db, pCte->zName);
    pTab->iPKey = -1;
    pTab->nRowLogEst = 200; assert( 200==sqlite3LogEst(1048576) );
    pTab->tabFlags |= TF_Ephemeral | TF_NoVisibleRowid;
    pFrom->pSelect = sqlite3SelectDup(db, pCte->pSelect, 0);
    if( db->mallocFailed ) return SQLITE_NOMEM_BKPT;
    assert( pFrom->pSelect );

    /* Check if this is a recursive CTE. */
    pSel = pFrom->pSelect;
    bMayRecursive = ( pSel->op==TK_ALL || pSel->op==TK_UNION );
    if( bMayRecursive ){
      int i;
................................................................................
      pItem->regReturn = ++pParse->nMem;
      sqlite3VdbeAddOp3(v, OP_InitCoroutine, pItem->regReturn, 0, addrTop);
      VdbeComment((v, "%s", pItem->pTab->zName));
      pItem->addrFillSub = addrTop;
      sqlite3SelectDestInit(&dest, SRT_Coroutine, pItem->regReturn);
      explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);
      sqlite3Select(pParse, pSub, &dest);
      pItem->pTab->nRowLogEst = pSub->nSelectRow;
      pItem->fg.viaCoroutine = 1;
      pItem->regResult = dest.iSdst;
      sqlite3VdbeEndCoroutine(v, pItem->regReturn);
      sqlite3VdbeJumpHere(v, addrTop-1);
      sqlite3ClearTempRegCache(pParse);
    }else{
      /* Generate a subroutine that will fill an ephemeral table with
................................................................................
        VdbeComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }else{
        VdbeNoopComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }
      sqlite3SelectDestInit(&dest, SRT_EphemTab, pItem->iCursor);
      explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);
      sqlite3Select(pParse, pSub, &dest);
      pItem->pTab->nRowLogEst = pSub->nSelectRow;
      if( onceAddr ) sqlite3VdbeJumpHere(v, onceAddr);
      retAddr = sqlite3VdbeAddOp1(v, OP_Return, pItem->regReturn);
      VdbeComment((v, "end %s", pItem->pTab->zName));
      sqlite3VdbeChangeP1(v, topAddr, retAddr);
      sqlite3ClearTempRegCache(pParse);
    }
    if( db->mallocFailed ) goto select_end;
................................................................................
  if( pDest->eDest==SRT_EphemTab ){
    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pDest->iSDParm, pEList->nExpr);
  }

  /* Set the limiter.
  */
  iEnd = sqlite3VdbeMakeLabel(v);
  p->nSelectRow = 320;  /* 4 billion rows */
  computeLimitRegisters(pParse, p, iEnd);
  if( p->iLimit==0 && sSort.addrSortIndex>=0 ){
    sqlite3VdbeChangeOpcode(v, sSort.addrSortIndex, OP_SorterOpen);
    sSort.sortFlags |= SORTFLAG_UseSorter;
  }

  /* Open an ephemeral index to use for the distinct set.
................................................................................
  }else{
    sDistinct.eTnctType = WHERE_DISTINCT_NOOP;
  }

  if( !isAgg && pGroupBy==0 ){
    /* No aggregate functions and no GROUP BY clause */
    u16 wctrlFlags = (sDistinct.isTnct ? WHERE_WANT_DISTINCT : 0);
    assert( WHERE_USE_LIMIT==SF_FixedLimit );
    wctrlFlags |= p->selFlags & SF_FixedLimit;

    /* Begin the database scan. */
    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, sSort.pOrderBy,
                               p->pEList, wctrlFlags, p->nSelectRow);
    if( pWInfo==0 ) goto select_end;
    if( sqlite3WhereOutputRowCount(pWInfo) < p->nSelectRow ){
      p->nSelectRow = sqlite3WhereOutputRowCount(pWInfo);
    }
    if( sDistinct.isTnct && sqlite3WhereIsDistinct(pWInfo) ){
      sDistinct.eTnctType = sqlite3WhereIsDistinct(pWInfo);
    }
................................................................................

      for(k=p->pEList->nExpr, pItem=p->pEList->a; k>0; k--, pItem++){
        pItem->u.x.iAlias = 0;
      }
      for(k=pGroupBy->nExpr, pItem=pGroupBy->a; k>0; k--, pItem++){
        pItem->u.x.iAlias = 0;
      }
      assert( 66==sqlite3LogEst(100) );
      if( p->nSelectRow>66 ) p->nSelectRow = 66;
    }else{
      assert( 0==sqlite3LogEst(1) );
      p->nSelectRow = 0;
    }

    /* If there is both a GROUP BY and an ORDER BY clause and they are
    ** identical, then it may be possible to disable the ORDER BY clause 
    ** on the grounds that the GROUP BY will cause elements to come out 
    ** in the correct order. It also may not - the GROUP BY might use a
    ** database index that causes rows to be grouped together as required

    nByte = strlen30(zSql);
    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    import_append_char(&sCtx, 0);    /* To ensure sCtx.z is allocated */
    if( rc && sqlite3_strglob("no such table: *", sqlite3_errmsg(p->db))==0 ){
      char *zCreate = sqlite3_mprintf("CREATE TABLE %s", zTable);
      char cSep = '(';
      while( xRead(&sCtx) ){
        zCreate = sqlite3_mprintf("%z%c\n  \"%s\" TEXT", zCreate, cSep, sCtx.z);
        cSep = ',';
        if( sCtx.cTerm!=sCtx.cColSep ) break;
      }
      if( cSep=='(' ){
        sqlite3_free(zCreate);
        sqlite3_free(sCtx.z);
        xCloser(sCtx.in);

    nByte = strlen30(zSql);
    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    import_append_char(&sCtx, 0);    /* To ensure sCtx.z is allocated */
    if( rc && sqlite3_strglob("no such table: *", sqlite3_errmsg(p->db))==0 ){
      char *zCreate = sqlite3_mprintf("CREATE TABLE %s", zTable);
      char cSep = '(';
      while( xRead(&sCtx) ){
        zCreate = sqlite3_mprintf("%z%c\n  \"%w\" TEXT", zCreate, cSep, sCtx.z);
        cSep = ',';
        if( sCtx.cTerm!=sCtx.cColSep ) break;
      }
      if( cSep=='(' ){
        sqlite3_free(zCreate);
        sqlite3_free(sCtx.z);
        xCloser(sCtx.in);

** are undefined.
**
** A single database handle may have at most a single write-ahead log callback 
** registered at one time. ^Calling [sqlite3_wal_hook()] replaces any
** previously registered write-ahead log callback. ^Note that the
** [sqlite3_wal_autocheckpoint()] interface and the
** [wal_autocheckpoint pragma] both invoke [sqlite3_wal_hook()] and will
** those overwrite any prior [sqlite3_wal_hook()] settings.
*/
void *sqlite3_wal_hook(
  sqlite3*, 
  int(*)(void *,sqlite3*,const char*,int),
  void*
);

** are undefined.
**
** A single database handle may have at most a single write-ahead log callback 
** registered at one time. ^Calling [sqlite3_wal_hook()] replaces any
** previously registered write-ahead log callback. ^Note that the
** [sqlite3_wal_autocheckpoint()] interface and the
** [wal_autocheckpoint pragma] both invoke [sqlite3_wal_hook()] and will
** overwrite any prior [sqlite3_wal_hook()] settings.
*/
void *sqlite3_wal_hook(
  sqlite3*, 
  int(*)(void *,sqlite3*,const char*,int),
  void*
);

*************************************************************************
** Internal interface definitions for SQLite.
**
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_









/*
** Include the header file used to customize the compiler options for MSVC.
** This should be done first so that it can successfully prevent spurious
** compiler warnings due to subsequent content in this file and other files
** that are included by this file.
*/
#include "msvc.h"
................................................................................

/*
** The following macros are used to cast pointers to integers and
** integers to pointers.  The way you do this varies from one compiler
** to the next, so we have developed the following set of #if statements
** to generate appropriate macros for a wide range of compilers.
**
** The correct "ANSI" way to do this is to use the intptr_t type. 
** Unfortunately, that typedef is not available on all compilers, or
** if it is available, it requires an #include of specific headers
** that vary from one machine to the next.
**
** Ticket #3860:  The llvm-gcc-4.2 compiler from Apple chokes on
** the ((void*)&((char*)0)[X]) construct.  But MSVC chokes on ((void*)(X)).
** So we have to define the macros in different ways depending on the
................................................................................
**
** Setting NDEBUG makes the code smaller and faster by disabling the
** assert() statements in the code.  So we want the default action
** to be for NDEBUG to be set and NDEBUG to be undefined only if SQLITE_DEBUG
** is set.  Thus NDEBUG becomes an opt-in rather than an opt-out
** feature.
*/
#if !defined(NDEBUG) && !defined(SQLITE_DEBUG) 
# define NDEBUG 1
#endif
#if defined(NDEBUG) && defined(SQLITE_DEBUG)
# undef NDEBUG
#endif

/*
................................................................................
** Enable SQLITE_ENABLE_EXPLAIN_COMMENTS if SQLITE_DEBUG is turned on.
*/
#if !defined(SQLITE_ENABLE_EXPLAIN_COMMENTS) && defined(SQLITE_DEBUG)
# define SQLITE_ENABLE_EXPLAIN_COMMENTS 1
#endif

/*
** The testcase() macro is used to aid in coverage testing.  When 
** doing coverage testing, the condition inside the argument to
** testcase() must be evaluated both true and false in order to
** get full branch coverage.  The testcase() macro is inserted
** to help ensure adequate test coverage in places where simple
** condition/decision coverage is inadequate.  For example, testcase()
** can be used to make sure boundary values are tested.  For
** bitmask tests, testcase() can be used to make sure each bit
................................................................................
#ifndef NDEBUG
# define VVA_ONLY(X)  X
#else
# define VVA_ONLY(X)
#endif

/*
** The ALWAYS and NEVER macros surround boolean expressions which 
** are intended to always be true or false, respectively.  Such
** expressions could be omitted from the code completely.  But they
** are included in a few cases in order to enhance the resilience
** of SQLite to unexpected behavior - to make the code "self-healing"
** or "ductile" rather than being "brittle" and crashing at the first
** hint of unplanned behavior.
**
................................................................................
#endif
#ifndef SQLITE_BIG_DBL
# define SQLITE_BIG_DBL (1e99)
#endif

/*
** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0
** afterward. Having this macro allows us to cause the C compiler 
** to omit code used by TEMP tables without messy #ifndef statements.
*/
#ifdef SQLITE_OMIT_TEMPDB
#define OMIT_TEMPDB 1
#else
#define OMIT_TEMPDB 0
#endif
................................................................................
#ifndef SQLITE_TEMP_STORE
# define SQLITE_TEMP_STORE 1
# define SQLITE_TEMP_STORE_xc 1  /* Exclude from ctime.c */
#endif

/*
** If no value has been provided for SQLITE_MAX_WORKER_THREADS, or if
** SQLITE_TEMP_STORE is set to 3 (never use temporary files), set it 
** to zero.
*/
#if SQLITE_TEMP_STORE==3 || SQLITE_THREADSAFE==0
# undef SQLITE_MAX_WORKER_THREADS
# define SQLITE_MAX_WORKER_THREADS 0
#endif
#ifndef SQLITE_MAX_WORKER_THREADS
................................................................................
** Examples:
**      1 -> 0              20 -> 43          10000 -> 132
**      2 -> 10             25 -> 46          25000 -> 146
**      3 -> 16            100 -> 66        1000000 -> 199
**      4 -> 20           1000 -> 99        1048576 -> 200
**     10 -> 33           1024 -> 100    4294967296 -> 320
**
** The LogEst can be negative to indicate fractional values. 
** Examples:
**
**    0.5 -> -10           0.1 -> -33        0.0625 -> -40
*/
typedef INT16_TYPE LogEst;

/*
................................................................................
** Constants for the largest and smallest possible 64-bit signed integers.
** These macros are designed to work correctly on both 32-bit and 64-bit
** compilers.
*/
#define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)

/* 
** Round up a number to the next larger multiple of 8.  This is used
** to force 8-byte alignment on 64-bit architectures.
*/
#define ROUND8(x)     (((x)+7)&~7)

/*
** Round down to the nearest multiple of 8
................................................................................
# define SELECTTRACE_ENABLED 1
#else
# define SELECTTRACE_ENABLED 0
#endif

/*
** An instance of the following structure is used to store the busy-handler
** callback for a given sqlite handle. 
**
** The sqlite.busyHandler member of the sqlite struct contains the busy
** callback for the database handle. Each pager opened via the sqlite
** handle is passed a pointer to sqlite.busyHandler. The busy-handler
** callback is currently invoked only from within pager.c.
*/
typedef struct BusyHandler BusyHandler;
................................................................................
/*
** Determine if the argument is a power of two
*/
#define IsPowerOfTwo(X) (((X)&((X)-1))==0)

/*
** The following value as a destructor means to use sqlite3DbFree().
** The sqlite3DbFree() routine requires two parameters instead of the 
** one parameter that destructors normally want.  So we have to introduce 
** this magic value that the code knows to handle differently.  Any 
** pointer will work here as long as it is distinct from SQLITE_STATIC
** and SQLITE_TRANSIENT.
*/
#define SQLITE_DYNAMIC   ((sqlite3_destructor_type)sqlite3MallocSize)

/*
** When SQLITE_OMIT_WSD is defined, it means that the target platform does
................................................................................
#ifdef SQLITE_OMIT_WSD
  #define SQLITE_WSD const
  #define GLOBAL(t,v) (*(t*)sqlite3_wsd_find((void*)&(v), sizeof(v)))
  #define sqlite3GlobalConfig GLOBAL(struct Sqlite3Config, sqlite3Config)
  int sqlite3_wsd_init(int N, int J);
  void *sqlite3_wsd_find(void *K, int L);
#else
  #define SQLITE_WSD 
  #define GLOBAL(t,v) v
  #define sqlite3GlobalConfig sqlite3Config
#endif

/*
** The following macros are used to suppress compiler warnings and to
** make it clear to human readers when a function parameter is deliberately 
** left unused within the body of a function. This usually happens when
** a function is called via a function pointer. For example the 
** implementation of an SQL aggregate step callback may not use the
** parameter indicating the number of arguments passed to the aggregate,
** if it knows that this is enforced elsewhere.
**
** When a function parameter is not used at all within the body of a function,
** it is generally named "NotUsed" or "NotUsed2" to make things even clearer.
** However, these macros may also be used to suppress warnings related to
................................................................................
typedef struct VTable VTable;
typedef struct VtabCtx VtabCtx;
typedef struct Walker Walker;
typedef struct WhereInfo WhereInfo;
typedef struct With With;

/*
** Defer sourcing vdbe.h and btree.h until after the "u8" and 
** "BusyHandler" typedefs. vdbe.h also requires a few of the opaque
** pointer types (i.e. FuncDef) defined above.
*/
#include "btree.h"
#include "vdbe.h"
#include "pager.h"
#include "pcache.h"
................................................................................
/*
** An instance of the following structure stores a database schema.
**
** Most Schema objects are associated with a Btree.  The exception is
** the Schema for the TEMP databaes (sqlite3.aDb[1]) which is free-standing.
** In shared cache mode, a single Schema object can be shared by multiple
** Btrees that refer to the same underlying BtShared object.
** 
** Schema objects are automatically deallocated when the last Btree that
** references them is destroyed.   The TEMP Schema is manually freed by
** sqlite3_close().
*
** A thread must be holding a mutex on the corresponding Btree in order
** to access Schema content.  This implies that the thread must also be
** holding a mutex on the sqlite3 connection pointer that owns the Btree.
................................................................................
  u8 file_format;      /* Schema format version for this file */
  u8 enc;              /* Text encoding used by this database */
  u16 schemaFlags;     /* Flags associated with this schema */
  int cache_size;      /* Number of pages to use in the cache */
};

/*
** These macros can be used to test, set, or clear bits in the 
** Db.pSchema->flags field.
*/
#define DbHasProperty(D,I,P)     (((D)->aDb[I].pSchema->schemaFlags&(P))==(P))
#define DbHasAnyProperty(D,I,P)  (((D)->aDb[I].pSchema->schemaFlags&(P))!=0)
#define DbSetProperty(D,I,P)     (D)->aDb[I].pSchema->schemaFlags|=(P)
#define DbClearProperty(D,I,P)   (D)->aDb[I].pSchema->schemaFlags&=~(P)

................................................................................
  void *pEnd;             /* First byte past end of available space */
};
struct LookasideSlot {
  LookasideSlot *pNext;    /* Next buffer in the list of free buffers */
};

/*
** A hash table for function definitions.

**
** Hash each FuncDef structure into one of the FuncDefHash.a[] slots.
** Collisions are on the FuncDef.pHash chain.
*/

struct FuncDefHash {
  FuncDef *a[23];       /* Hash table for functions */
};

#ifdef SQLITE_USER_AUTHENTICATION
/*
** Information held in the "sqlite3" database connection object and used
** to manage user authentication.
*/
................................................................................
  int nVDestroy;                /* Number of active OP_VDestroy operations */
  int nExtension;               /* Number of loaded extensions */
  void **aExtension;            /* Array of shared library handles */
  void (*xTrace)(void*,const char*);        /* Trace function */
  void *pTraceArg;                          /* Argument to the trace function */
  void (*xProfile)(void*,const char*,u64);  /* Profiling function */
  void *pProfileArg;                        /* Argument to profile function */
  void *pCommitArg;                 /* Argument to xCommitCallback() */   
  int (*xCommitCallback)(void*);    /* Invoked at every commit. */
  void *pRollbackArg;               /* Argument to xRollbackCallback() */   
  void (*xRollbackCallback)(void*); /* Invoked at every commit. */
  void *pUpdateArg;
  void (*xUpdateCallback)(void*,int, const char*,const char*,sqlite_int64);
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
  void *pPreUpdateArg;          /* First argument to xPreUpdateCallback */
  void (*xPreUpdateCallback)(   /* Registered using sqlite3_preupdate_hook() */
    void*,sqlite3*,int,char const*,char const*,sqlite3_int64,sqlite3_int64
................................................................................
#ifndef SQLITE_OMIT_VIRTUALTABLE
  int nVTrans;                  /* Allocated size of aVTrans */
  Hash aModule;                 /* populated by sqlite3_create_module() */
  VtabCtx *pVtabCtx;            /* Context for active vtab connect/create */
  VTable **aVTrans;             /* Virtual tables with open transactions */
  VTable *pDisconnect;    /* Disconnect these in next sqlite3_prepare() */
#endif
  FuncDefHash aFunc;            /* Hash table of connection functions */
  Hash aCollSeq;                /* All collating sequences */
  BusyHandler busyHandler;      /* Busy callback */
  Db aDbStatic[2];              /* Static space for the 2 default backends */
  Savepoint *pSavepoint;        /* List of active savepoints */
  int busyTimeout;              /* Busy handler timeout, in msec */
  int nSavepoint;               /* Number of non-transaction savepoints */
  int nStatement;               /* Number of nested statement-transactions  */
  i64 nDeferredCons;            /* Net deferred constraints this transaction. */
  i64 nDeferredImmCons;         /* Net deferred immediate constraints */
  int *pnBytesFreed;            /* If not NULL, increment this in DbFree() */
#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
  /* The following variables are all protected by the STATIC_MASTER 
  ** mutex, not by sqlite3.mutex. They are used by code in notify.c. 
  **
  ** When X.pUnlockConnection==Y, that means that X is waiting for Y to
  ** unlock so that it can proceed.
  **
  ** When X.pBlockingConnection==Y, that means that something that X tried
  ** tried to do recently failed with an SQLITE_LOCKED error due to locks
  ** held by Y.
................................................................................
#define SQLITE_MAGIC_SICK     0x4b771290  /* Error and awaiting close */
#define SQLITE_MAGIC_BUSY     0xf03b7906  /* Database currently in use */
#define SQLITE_MAGIC_ERROR    0xb5357930  /* An SQLITE_MISUSE error occurred */
#define SQLITE_MAGIC_ZOMBIE   0x64cffc7f  /* Close with last statement close */

/*
** Each SQL function is defined by an instance of the following

** structure.  A pointer to this structure is stored in the sqlite.aFunc
** hash table.  When multiple functions have the same name, the hash table
** points to a linked list of these structures.




*/
struct FuncDef {
  i16 nArg;            /* Number of arguments.  -1 means unlimited */
  u16 funcFlags;       /* Some combination of SQLITE_FUNC_* */
  void *pUserData;     /* User data parameter */
  FuncDef *pNext;      /* Next function with same name */
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**); /* func or agg-step */
  void (*xFinalize)(sqlite3_context*);                  /* Agg finalizer */
  char *zName;         /* SQL name of the function. */

  FuncDef *pHash;      /* Next with a different name but the same hash */
  FuncDestructor *pDestructor;   /* Reference counted destructor function */

};

/*
** This structure encapsulates a user-function destructor callback (as
** configured using create_function_v2()) and a reference counter. When
** create_function_v2() is called to create a function with a destructor,
** a single object of this type is allocated. FuncDestructor.nRef is set to 
** the number of FuncDef objects created (either 1 or 3, depending on whether
** or not the specified encoding is SQLITE_ANY). The FuncDef.pDestructor
** member of each of the new FuncDef objects is set to point to the allocated
** FuncDestructor.
**
** Thereafter, when one of the FuncDef objects is deleted, the reference
** count on this object is decremented. When it reaches 0, the destructor
................................................................................
                                    ** single query - might change over time */

/*
** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
** used to create the initializers for the FuncDef structures.
**
**   FUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Used to create a scalar function definition of a function zName 
**     implemented by C function xFunc that accepts nArg arguments. The
**     value passed as iArg is cast to a (void*) and made available
**     as the user-data (sqlite3_user_data()) for the function. If 
**     argument bNC is true, then the SQLITE_FUNC_NEEDCOLL flag is set.
**
**   VFUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag.
**
**   DFUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag and
................................................................................
**   AGGREGATE(zName, nArg, iArg, bNC, xStep, xFinal)
**     Used to create an aggregate function definition implemented by
**     the C functions xStep and xFinal. The first four parameters
**     are interpreted in the same way as the first 4 parameters to
**     FUNCTION().
**
**   LIKEFUNC(zName, nArg, pArg, flags)
**     Used to create a scalar function definition of a function zName 
**     that accepts nArg arguments and is implemented by a call to C 
**     function likeFunc. Argument pArg is cast to a (void *) and made
**     available as the function user-data (sqlite3_user_data()). The
**     FuncDef.flags variable is set to the value passed as the flags
**     parameter.
*/
#define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define VFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
  {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   pArg, 0, xFunc, 0, #zName, 0, 0}
#define LIKEFUNC(zName, nArg, arg, flags) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \
   (void *)arg, 0, likeFunc, 0, #zName, 0, 0}
#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName,0,0}
#define AGGREGATE2(zName, nArg, arg, nc, xStep, xFinal, extraFlags) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL)|extraFlags, \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName,0,0}

/*
** All current savepoints are stored in a linked list starting at
** sqlite3.pSavepoint. The first element in the list is the most recently
** opened savepoint. Savepoints are added to the list by the vdbe
** OP_Savepoint instruction.
*/
................................................................................
#define SQLITE_SO_UNDEFINED -1 /* No sort order specified */

/*
** Column affinity types.
**
** These used to have mnemonic name like 'i' for SQLITE_AFF_INTEGER and
** 't' for SQLITE_AFF_TEXT.  But we can save a little space and improve
** the speed a little by numbering the values consecutively.  
**
** But rather than start with 0 or 1, we begin with 'A'.  That way,
** when multiple affinity types are concatenated into a string and
** used as the P4 operand, they will be more readable.
**
** Note also that the numeric types are grouped together so that testing
** for a numeric type is a single comparison.  And the BLOB type is first.
................................................................................
#define SQLITE_AFF_INTEGER  'D'
#define SQLITE_AFF_REAL     'E'

#define sqlite3IsNumericAffinity(X)  ((X)>=SQLITE_AFF_NUMERIC)

/*
** The SQLITE_AFF_MASK values masks off the significant bits of an
** affinity value. 
*/
#define SQLITE_AFF_MASK     0x47

/*
** Additional bit values that can be ORed with an affinity without
** changing the affinity.
**
................................................................................
#define SQLITE_JUMPIFNULL   0x10  /* jumps if either operand is NULL */
#define SQLITE_STOREP2      0x20  /* Store result in reg[P2] rather than jump */
#define SQLITE_NULLEQ       0x80  /* NULL=NULL */
#define SQLITE_NOTNULL      0x90  /* Assert that operands are never NULL */

/*
** An object of this type is created for each virtual table present in
** the database schema. 
**
** If the database schema is shared, then there is one instance of this
** structure for each database connection (sqlite3*) that uses the shared
** schema. This is because each database connection requires its own unique
** instance of the sqlite3_vtab* handle used to access the virtual table 
** implementation. sqlite3_vtab* handles can not be shared between 
** database connections, even when the rest of the in-memory database 
** schema is shared, as the implementation often stores the database
** connection handle passed to it via the xConnect() or xCreate() method
** during initialization internally. This database connection handle may
** then be used by the virtual table implementation to access real tables 
** within the database. So that they appear as part of the callers 
** transaction, these accesses need to be made via the same database 
** connection as that used to execute SQL operations on the virtual table.
**
** All VTable objects that correspond to a single table in a shared
** database schema are initially stored in a linked-list pointed to by
** the Table.pVTable member variable of the corresponding Table object.
** When an sqlite3_prepare() operation is required to access the virtual
** table, it searches the list for the VTable that corresponds to the
** database connection doing the preparing so as to use the correct
** sqlite3_vtab* handle in the compiled query.
**
** When an in-memory Table object is deleted (for example when the
** schema is being reloaded for some reason), the VTable objects are not 
** deleted and the sqlite3_vtab* handles are not xDisconnect()ed 
** immediately. Instead, they are moved from the Table.pVTable list to
** another linked list headed by the sqlite3.pDisconnect member of the
** corresponding sqlite3 structure. They are then deleted/xDisconnected 
** next time a statement is prepared using said sqlite3*. This is done
** to avoid deadlock issues involving multiple sqlite3.mutex mutexes.
** Refer to comments above function sqlite3VtabUnlockList() for an
** explanation as to why it is safe to add an entry to an sqlite3.pDisconnect
** list without holding the corresponding sqlite3.mutex mutex.
**
** The memory for objects of this type is always allocated by 
** sqlite3DbMalloc(), using the connection handle stored in VTable.db as 
** the first argument.
*/
struct VTable {
  sqlite3 *db;              /* Database connection associated with this table */
  Module *pMod;             /* Pointer to module implementation */
  sqlite3_vtab *pVtab;      /* Pointer to vtab instance */
  int nRef;                 /* Number of pointers to this structure */
................................................................................
**
** RESTRICT, SETNULL, and CASCADE actions apply only to foreign keys.
** RESTRICT is the same as ABORT for IMMEDIATE foreign keys and the
** same as ROLLBACK for DEFERRED keys.  SETNULL means that the foreign
** key is set to NULL.  CASCADE means that a DELETE or UPDATE of the
** referenced table row is propagated into the row that holds the
** foreign key.
** 
** The following symbolic values are used to record which type
** of action to take.
*/
#define OE_None     0   /* There is no constraint to check */
#define OE_Rollback 1   /* Fail the operation and rollback the transaction */
#define OE_Abort    2   /* Back out changes but do no rollback transaction */
#define OE_Fail     3   /* Stop the operation but leave all prior changes */
................................................................................
#define OE_Cascade  9   /* Cascade the changes */

#define OE_Default  10  /* Do whatever the default action is */


/*
** An instance of the following structure is passed as the first
** argument to sqlite3VdbeKeyCompare and is used to control the 
** comparison of the two index keys.
**
** Note that aSortOrder[] and aColl[] have nField+1 slots.  There
** are nField slots for the columns of an index then one extra slot
** for the rowid at the end.
*/
struct KeyInfo {
................................................................................
** or greater than a key in the btree, respectively.  These are normally
** -1 and +1 respectively, but might be inverted to +1 and -1 if the b-tree
** is in DESC order.
**
** The key comparison functions actually return default_rc when they find
** an equals comparison.  default_rc can be -1, 0, or +1.  If there are
** multiple entries in the b-tree with the same key (when only looking
** at the first pKeyInfo->nFields,) then default_rc can be set to -1 to 
** cause the search to find the last match, or +1 to cause the search to
** find the first match.
**
** The key comparison functions will set eqSeen to true if they ever
** get and equal results when comparing this structure to a b-tree record.
** When default_rc!=0, the search might end up on the record immediately
** before the first match or immediately after the last match.  The
................................................................................
**
**     CREATE TABLE Ex1(c1 int, c2 int, c3 text);
**     CREATE INDEX Ex2 ON Ex1(c3,c1);
**
** In the Table structure describing Ex1, nCol==3 because there are
** three columns in the table.  In the Index structure describing
** Ex2, nColumn==2 since 2 of the 3 columns of Ex1 are indexed.
** The value of aiColumn is {2, 0}.  aiColumn[0]==2 because the 
** first column to be indexed (c3) has an index of 2 in Ex1.aCol[].
** The second column to be indexed (c1) has an index of 0 in
** Ex1.aCol[], hence Ex2.aiColumn[1]==0.
**
** The Index.onError field determines whether or not the indexed columns
** must be unique and what to do if they are not.  When Index.onError=OE_None,
** it means this is not a unique index.  Otherwise it is a unique index
** and the value of Index.onError indicate the which conflict resolution 
** algorithm to employ whenever an attempt is made to insert a non-unique
** element.
**
** While parsing a CREATE TABLE or CREATE INDEX statement in order to
** generate VDBE code (as opposed to parsing one read from an sqlite_master
** table as part of parsing an existing database schema), transient instances
** of this structure may be created. In this case the Index.tnum variable is
................................................................................
/* The Index.aiColumn[] values are normally positive integer.  But
** there are some negative values that have special meaning:
*/
#define XN_ROWID     (-1)     /* Indexed column is the rowid */
#define XN_EXPR      (-2)     /* Indexed column is an expression */

/*
** Each sample stored in the sqlite_stat3 table is represented in memory 
** using a structure of this type.  See documentation at the top of the
** analyze.c source file for additional information.
*/
struct IndexSample {
  void *p;          /* Pointer to sampled record */
  int n;            /* Size of record in bytes */
  tRowcnt *anEq;    /* Est. number of rows where the key equals this sample */
................................................................................
**
** Expr.op is the opcode. The integer parser token codes are reused
** as opcodes here. For example, the parser defines TK_GE to be an integer
** code representing the ">=" operator. This same integer code is reused
** to represent the greater-than-or-equal-to operator in the expression
** tree.
**
** If the expression is an SQL literal (TK_INTEGER, TK_FLOAT, TK_BLOB, 
** or TK_STRING), then Expr.token contains the text of the SQL literal. If
** the expression is a variable (TK_VARIABLE), then Expr.token contains the 
** variable name. Finally, if the expression is an SQL function (TK_FUNCTION),
** then Expr.token contains the name of the function.
**
** Expr.pRight and Expr.pLeft are the left and right subexpressions of a
** binary operator. Either or both may be NULL.
**
** Expr.x.pList is a list of arguments if the expression is an SQL function,
** a CASE expression or an IN expression of the form "<lhs> IN (<y>, <z>...)".
** Expr.x.pSelect is used if the expression is a sub-select or an expression of
** the form "<lhs> IN (SELECT ...)". If the EP_xIsSelect bit is set in the
** Expr.flags mask, then Expr.x.pSelect is valid. Otherwise, Expr.x.pList is 
** valid.
**
** An expression of the form ID or ID.ID refers to a column in a table.
** For such expressions, Expr.op is set to TK_COLUMN and Expr.iTable is
** the integer cursor number of a VDBE cursor pointing to that table and
** Expr.iColumn is the column number for the specific column.  If the
** expression is used as a result in an aggregate SELECT, then the
** value is also stored in the Expr.iAgg column in the aggregate so that
** it can be accessed after all aggregates are computed.
**
** If the expression is an unbound variable marker (a question mark 
** character '?' in the original SQL) then the Expr.iTable holds the index 
** number for that variable.
**
** If the expression is a subquery then Expr.iColumn holds an integer
** register number containing the result of the subquery.  If the
** subquery gives a constant result, then iTable is -1.  If the subquery
** gives a different answer at different times during statement processing
** then iTable is the address of a subroutine that computes the subquery.
................................................................................
  union {
    char *zToken;          /* Token value. Zero terminated and dequoted */
    int iValue;            /* Non-negative integer value if EP_IntValue */
  } u;

  /* If the EP_TokenOnly flag is set in the Expr.flags mask, then no
  ** space is allocated for the fields below this point. An attempt to
  ** access them will result in a segfault or malfunction. 
  *********************************************************************/

  Expr *pLeft;           /* Left subnode */
  Expr *pRight;          /* Right subnode */
  union {
    ExprList *pList;     /* op = IN, EXISTS, SELECT, CASE, FUNCTION, BETWEEN */
    Select *pSelect;     /* EP_xIsSelect and op = IN, EXISTS, SELECT */
................................................................................

/*
** Combinations of two or more EP_* flags
*/
#define EP_Propagate (EP_Collate|EP_Subquery) /* Propagate these bits up tree */

/*
** These macros can be used to test, set, or clear bits in the 
** Expr.flags field.
*/
#define ExprHasProperty(E,P)     (((E)->flags&(P))!=0)
#define ExprHasAllProperty(E,P)  (((E)->flags&(P))==(P))
#define ExprSetProperty(E,P)     (E)->flags|=(P)
#define ExprClearProperty(E,P)   (E)->flags&=~(P)

................................................................................
#ifdef SQLITE_DEBUG
# define ExprSetVVAProperty(E,P)  (E)->flags|=(P)
#else
# define ExprSetVVAProperty(E,P)
#endif

/*
** Macros to determine the number of bytes required by a normal Expr 
** struct, an Expr struct with the EP_Reduced flag set in Expr.flags 
** and an Expr struct with the EP_TokenOnly flag set.
*/
#define EXPR_FULLSIZE           sizeof(Expr)           /* Full size */
#define EXPR_REDUCEDSIZE        offsetof(Expr,iTable)  /* Common features */
#define EXPR_TOKENONLYSIZE      offsetof(Expr,pLeft)   /* Fewer features */

/*
** Flags passed to the sqlite3ExprDup() function. See the header comment 
** above sqlite3ExprDup() for details.
*/
#define EXPRDUP_REDUCE         0x0001  /* Used reduced-size Expr nodes */

/*
** A list of expressions.  Each expression may optionally have a
** name.  An expr/name combination can be used in several ways, such
................................................................................
/*
** The bitmask datatype defined below is used for various optimizations.
**
** Changing this from a 64-bit to a 32-bit type limits the number of
** tables in a join to 32 instead of 64.  But it also reduces the size
** of the library by 738 bytes on ix86.
*/



typedef u64 Bitmask;


/*
** The number of bits in a Bitmask.  "BMS" means "BitMask Size".
*/
#define BMS  ((int)(sizeof(Bitmask)*8))

/*
................................................................................
#define WHERE_NO_AUTOINDEX     0x0080 /* Disallow automatic indexes */
#define WHERE_GROUPBY          0x0100 /* pOrderBy is really a GROUP BY */
#define WHERE_DISTINCTBY       0x0200 /* pOrderby is really a DISTINCT clause */
#define WHERE_WANT_DISTINCT    0x0400 /* All output needs to be distinct */
#define WHERE_SORTBYGROUP      0x0800 /* Support sqlite3WhereIsSorted() */
#define WHERE_REOPEN_IDX       0x1000 /* Try to use OP_ReopenIdx */
#define WHERE_ONEPASS_MULTIROW 0x2000 /* ONEPASS is ok with multiple rows */


/* Allowed return values from sqlite3WhereIsDistinct()
*/
#define WHERE_DISTINCT_NOOP      0  /* DISTINCT keyword not used */
#define WHERE_DISTINCT_UNIQUE    1  /* No duplicates */
#define WHERE_DISTINCT_ORDERED   2  /* All duplicates are adjacent */
#define WHERE_DISTINCT_UNORDERED 3  /* Duplicates are scattered */
................................................................................
** names.  The context consists of a list of tables (the pSrcList) field and
** a list of named expression (pEList).  The named expression list may
** be NULL.  The pSrc corresponds to the FROM clause of a SELECT or
** to the table being operated on by INSERT, UPDATE, or DELETE.  The
** pEList corresponds to the result set of a SELECT and is NULL for
** other statements.
**
** NameContexts can be nested.  When resolving names, the inner-most 
** context is searched first.  If no match is found, the next outer
** context is checked.  If there is still no match, the next context
** is checked.  This process continues until either a match is found
** or all contexts are check.  When a match is found, the nRef member of
** the context containing the match is incremented. 
**
** Each subquery gets a new NameContext.  The pNext field points to the
** NameContext in the parent query.  Thus the process of scanning the
** NameContext list corresponds to searching through successively outer
** subqueries looking for a match.
*/
struct NameContext {
................................................................................
};

/*
** Allowed values for the NameContext, ncFlags field.
**
** Note:  NC_MinMaxAgg must have the same value as SF_MinMaxAgg and
** SQLITE_FUNC_MINMAX.
** 
*/
#define NC_AllowAgg  0x0001  /* Aggregate functions are allowed here */
#define NC_HasAgg    0x0002  /* One or more aggregate functions seen */
#define NC_IsCheck   0x0004  /* True if resolving names in a CHECK constraint */
#define NC_InAggFunc 0x0008  /* True if analyzing arguments to an agg func */
#define NC_PartIdx   0x0010  /* True if resolving a partial index WHERE */
#define NC_IdxExpr   0x0020  /* True if resolving columns of CREATE INDEX */
................................................................................
** The KeyInfo for addrOpenTran[0] and [1] contains collating sequences
** for the result set.  The KeyInfo for addrOpenEphm[2] contains collating
** sequences for the ORDER BY clause.
*/
struct Select {
  ExprList *pEList;      /* The fields of the result */
  u8 op;                 /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */

  u16 selFlags;          /* Various SF_* values */
  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
#if SELECTTRACE_ENABLED
  char zSelName[12];     /* Symbolic name of this SELECT use for debugging */
#endif
  int addrOpenEphm[2];   /* OP_OpenEphem opcodes related to this select */
  u64 nSelectRow;        /* Estimated number of result rows */
  SrcList *pSrc;         /* The FROM clause */
  Expr *pWhere;          /* The WHERE clause */
  ExprList *pGroupBy;    /* The GROUP BY clause */
  Expr *pHaving;         /* The HAVING clause */
  ExprList *pOrderBy;    /* The ORDER BY clause */
  Select *pPrior;        /* Prior select in a compound select statement */
  Select *pNext;         /* Next select to the left in a compound */
................................................................................
  With *pWith;           /* WITH clause attached to this select. Or NULL. */
};

/*
** Allowed values for Select.selFlags.  The "SF" prefix stands for
** "Select Flag".
*/
#define SF_Distinct        0x0001  /* Output should be DISTINCT */
#define SF_All             0x0002  /* Includes the ALL keyword */
#define SF_Resolved        0x0004  /* Identifiers have been resolved */
#define SF_Aggregate       0x0008  /* Contains aggregate functions */
#define SF_UsesEphemeral   0x0010  /* Uses the OpenEphemeral opcode */
#define SF_Expanded        0x0020  /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo     0x0040  /* FROM subqueries have Table metadata */
#define SF_Compound        0x0080  /* Part of a compound query */
#define SF_Values          0x0100  /* Synthesized from VALUES clause */
#define SF_MultiValue      0x0200  /* Single VALUES term with multiple rows */
#define SF_NestedFrom      0x0400  /* Part of a parenthesized FROM clause */
#define SF_MaybeConvert    0x0800  /* Need convertCompoundSelectToSubquery() */
#define SF_MinMaxAgg       0x1000  /* Aggregate containing min() or max() */
#define SF_Recursive       0x2000  /* The recursive part of a recursive CTE */

#define SF_Converted       0x4000  /* By convertCompoundSelectToSubquery() */
#define SF_IncludeHidden   0x8000  /* Include hidden columns in output */


/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
**     SRT_Union       Store results as a key in a temporary index 
**                     identified by pDest->iSDParm.
**
**     SRT_Except      Remove results from the temporary index pDest->iSDParm.
**
**     SRT_Exists      Store a 1 in memory cell pDest->iSDParm if the result
**                     set is not empty.
**
................................................................................
**
**     SRT_Mem         Only valid if the result is a single column.
**                     Store the first column of the first result row
**                     in register pDest->iSDParm then abandon the rest
**                     of the query.  This destination implies "LIMIT 1".
**
**     SRT_Set         The result must be a single column.  Store each
**                     row of result as the key in table pDest->iSDParm. 
**                     Apply the affinity pDest->affSdst before storing
**                     results.  Used to implement "IN (SELECT ...)".
**
**     SRT_EphemTab    Create an temporary table pDest->iSDParm and store
**                     the result there. The cursor is left open after
**                     returning.  This is like SRT_Table except that
**                     this destination uses OP_OpenEphemeral to create
................................................................................
  int iSDParm;         /* A parameter used by the eDest disposal method */
  int iSdst;           /* Base register where results are written */
  int nSdst;           /* Number of registers allocated */
  ExprList *pOrderBy;  /* Key columns for SRT_Queue and SRT_DistQueue */
};

/*
** During code generation of statements that do inserts into AUTOINCREMENT 
** tables, the following information is attached to the Table.u.autoInc.p
** pointer of each autoincrement table to record some side information that
** the code generator needs.  We have to keep per-table autoincrement
** information in case inserts are done within triggers.  Triggers do not
** normally coordinate their activities, but we do need to coordinate the
** loading and saving of autoincrement information.
*/
................................................................................
** Size of the column cache
*/
#ifndef SQLITE_N_COLCACHE
# define SQLITE_N_COLCACHE 10
#endif

/*
** At least one instance of the following structure is created for each 
** trigger that may be fired while parsing an INSERT, UPDATE or DELETE
** statement. All such objects are stored in the linked list headed at
** Parse.pTriggerPrg and deleted once statement compilation has been
** completed.
**
** A Vdbe sub-program that implements the body and WHEN clause of trigger
** TriggerPrg.pTrigger, assuming a default ON CONFLICT clause of
** TriggerPrg.orconf, is stored in the TriggerPrg.pProgram variable.
** The Parse.pTriggerPrg list never contains two entries with the same
** values for both pTrigger and orconf.
**
** The TriggerPrg.aColmask[0] variable is set to a mask of old.* columns
** accessed (or set to 0 for triggers fired as a result of INSERT 
** statements). Similarly, the TriggerPrg.aColmask[1] variable is set to
** a mask of new.* columns used by the program.
*/
struct TriggerPrg {
  Trigger *pTrigger;      /* Trigger this program was coded from */
  TriggerPrg *pNext;      /* Next entry in Parse.pTriggerPrg list */
  SubProgram *pProgram;   /* Program implementing pTrigger/orconf */
................................................................................
** carry around information that is global to the entire parse.
**
** The structure is divided into two parts.  When the parser and code
** generate call themselves recursively, the first part of the structure
** is constant but the second part is reset at the beginning and end of
** each recursion.
**
** The nTableLock and aTableLock variables are only used if the shared-cache 
** feature is enabled (if sqlite3Tsd()->useSharedData is true). They are
** used to store the set of table-locks required by the statement being
** compiled. Function sqlite3TableLock() is used to add entries to the
** list.
*/
struct Parse {
  sqlite3 *db;         /* The main database structure */
................................................................................
#define OPFLAG_P2ISREG       0x10    /* P2 to OP_Open** is a register number */
#define OPFLAG_PERMUTE       0x01    /* OP_Compare: use the permutation */
#define OPFLAG_SAVEPOSITION  0x02    /* OP_Delete: keep cursor position */
#define OPFLAG_AUXDELETE     0x04    /* OP_Delete: index in a DELETE op */

/*
 * Each trigger present in the database schema is stored as an instance of
 * struct Trigger. 
 *
 * Pointers to instances of struct Trigger are stored in two ways.
 * 1. In the "trigHash" hash table (part of the sqlite3* that represents the 
 *    database). This allows Trigger structures to be retrieved by name.
 * 2. All triggers associated with a single table form a linked list, using the
 *    pNext member of struct Trigger. A pointer to the first element of the
 *    linked list is stored as the "pTrigger" member of the associated
 *    struct Table.
 *
 * The "step_list" member points to the first element of a linked list
................................................................................
  Schema *pTabSchema;     /* Schema containing the table */
  TriggerStep *step_list; /* Link list of trigger program steps             */
  Trigger *pNext;         /* Next trigger associated with the table */
};

/*
** A trigger is either a BEFORE or an AFTER trigger.  The following constants
** determine which. 
**
** If there are multiple triggers, you might of some BEFORE and some AFTER.
** In that cases, the constants below can be ORed together.
*/
#define TRIGGER_BEFORE  1
#define TRIGGER_AFTER   2

/*
 * An instance of struct TriggerStep is used to store a single SQL statement
 * that is a part of a trigger-program. 
 *
 * Instances of struct TriggerStep are stored in a singly linked list (linked
 * using the "pNext" member) referenced by the "step_list" member of the 
 * associated struct Trigger instance. The first element of the linked list is
 * the first step of the trigger-program.
 * 
 * The "op" member indicates whether this is a "DELETE", "INSERT", "UPDATE" or
 * "SELECT" statement. The meanings of the other members is determined by the 
 * value of "op" as follows:
 *
 * (op == TK_INSERT)
 * orconf    -> stores the ON CONFLICT algorithm
 * pSelect   -> If this is an INSERT INTO ... SELECT ... statement, then
 *              this stores a pointer to the SELECT statement. Otherwise NULL.
 * zTarget   -> Dequoted name of the table to insert into.
 * pExprList -> If this is an INSERT INTO ... VALUES ... statement, then
 *              this stores values to be inserted. Otherwise NULL.
 * pIdList   -> If this is an INSERT INTO ... (<column-names>) VALUES ... 
 *              statement, then this stores the column-names to be
 *              inserted into.
 *
 * (op == TK_DELETE)
 * zTarget   -> Dequoted name of the table to delete from.
 * pWhere    -> The WHERE clause of the DELETE statement if one is specified.
 *              Otherwise NULL.
 * 
 * (op == TK_UPDATE)
 * zTarget   -> Dequoted name of the table to update.
 * pWhere    -> The WHERE clause of the UPDATE statement if one is specified.
 *              Otherwise NULL.
 * pExprList -> A list of the columns to update and the expressions to update
 *              them to. See sqlite3Update() documentation of "pChanges"
 *              argument.
 * 
 */
struct TriggerStep {
  u8 op;               /* One of TK_DELETE, TK_UPDATE, TK_INSERT, TK_SELECT */
  u8 orconf;           /* OE_Rollback etc. */
  Trigger *pTrig;      /* The trigger that this step is a part of */
  Select *pSelect;     /* SELECT statement or RHS of INSERT INTO SELECT ... */
  char *zTarget;       /* Target table for DELETE, UPDATE, INSERT */
................................................................................
  TriggerStep *pNext;  /* Next in the link-list */
  TriggerStep *pLast;  /* Last element in link-list. Valid for 1st elem only */
};

/*
** The following structure contains information used by the sqliteFix...
** routines as they walk the parse tree to make database references
** explicit.  
*/
typedef struct DbFixer DbFixer;
struct DbFixer {
  Parse *pParse;      /* The parsing context.  Error messages written here */
  Schema *pSchema;    /* Fix items to this schema */
  int bVarOnly;       /* Check for variable references only */
  const char *zDb;    /* Make sure all objects are contained in this database */
................................................................................
*/
int sqlite3CorruptError(int);
int sqlite3MisuseError(int);
int sqlite3CantopenError(int);
#define SQLITE_CORRUPT_BKPT sqlite3CorruptError(__LINE__)
#define SQLITE_MISUSE_BKPT sqlite3MisuseError(__LINE__)
#define SQLITE_CANTOPEN_BKPT sqlite3CantopenError(__LINE__)










/*
** FTS3 and FTS4 both require virtual table support
*/
#if defined(SQLITE_OMIT_VIRTUALTABLE)
# undef SQLITE_ENABLE_FTS3
# undef SQLITE_ENABLE_FTS4
................................................................................
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
int sqlite3IsIdChar(u8);
#endif

/*
** Internal function prototypes
*/
#define sqlite3StrICmp sqlite3_stricmp
int sqlite3Strlen30(const char*);
#define sqlite3StrNICmp sqlite3_strnicmp

int sqlite3MallocInit(void);
void sqlite3MallocEnd(void);
void *sqlite3Malloc(u64);
void *sqlite3MallocZero(u64);
................................................................................
**
** The alloca() routine never returns NULL.  This will cause code paths
** that deal with sqlite3StackAlloc() failures to be unreachable.
*/
#ifdef SQLITE_USE_ALLOCA
# define sqlite3StackAllocRaw(D,N)   alloca(N)
# define sqlite3StackAllocZero(D,N)  memset(alloca(N), 0, N)
# define sqlite3StackFree(D,P)       
#else
# define sqlite3StackAllocRaw(D,N)   sqlite3DbMallocRaw(D,N)
# define sqlite3StackAllocZero(D,N)  sqlite3DbMallocZero(D,N)
# define sqlite3StackFree(D,P)       sqlite3DbFree(D,P)
#endif

#ifdef SQLITE_ENABLE_MEMSYS3
................................................................................
void sqlite3SrcListDelete(sqlite3*, SrcList*);
Index *sqlite3AllocateIndexObject(sqlite3*,i16,int,char**);
Index *sqlite3CreateIndex(Parse*,Token*,Token*,SrcList*,ExprList*,int,Token*,
                          Expr*, int, int);
void sqlite3DropIndex(Parse*, SrcList*, int);
int sqlite3Select(Parse*, Select*, SelectDest*);
Select *sqlite3SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*,
                         Expr*,ExprList*,u16,Expr*,Expr*);
void sqlite3SelectDelete(sqlite3*, Select*);
Table *sqlite3SrcListLookup(Parse*, SrcList*);
int sqlite3IsReadOnly(Parse*, Table*, int);
void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);
#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
Expr *sqlite3LimitWhere(Parse*,SrcList*,Expr*,ExprList*,Expr*,Expr*,char*);
#endif
void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqlite3WhereBegin(Parse*,SrcList*,Expr*,ExprList*,ExprList*,u16,int);
void sqlite3WhereEnd(WhereInfo*);
u64 sqlite3WhereOutputRowCount(WhereInfo*);
int sqlite3WhereIsDistinct(WhereInfo*);
int sqlite3WhereIsOrdered(WhereInfo*);
int sqlite3WhereIsSorted(WhereInfo*);
int sqlite3WhereContinueLabel(WhereInfo*);
int sqlite3WhereBreakLabel(WhereInfo*);
int sqlite3WhereOkOnePass(WhereInfo*, int*);
#define ONEPASS_OFF      0        /* Use of ONEPASS not allowed */
................................................................................
IdList *sqlite3IdListDup(sqlite3*,IdList*);
Select *sqlite3SelectDup(sqlite3*,Select*,int);
#if SELECTTRACE_ENABLED
void sqlite3SelectSetName(Select*,const char*);
#else
# define sqlite3SelectSetName(A,B)
#endif
void sqlite3FuncDefInsert(FuncDefHash*, FuncDef*);
FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,int,u8,u8);
void sqlite3RegisterBuiltinFunctions(sqlite3*);
void sqlite3RegisterDateTimeFunctions(void);
void sqlite3RegisterGlobalFunctions(void);
int sqlite3SafetyCheckOk(sqlite3*);
int sqlite3SafetyCheckSickOrOk(sqlite3*);
void sqlite3ChangeCookie(Parse*, int);

#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
void sqlite3MaterializeView(Parse*, Table*, Expr*, int);
#endif
................................................................................
#else
# define sqlite3FileSuffix3(X,Y)
#endif
u8 sqlite3GetBoolean(const char *z,u8);

const void *sqlite3ValueText(sqlite3_value*, u8);
int sqlite3ValueBytes(sqlite3_value*, u8);
void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8, 
                        void(*)(void*));
void sqlite3ValueSetNull(sqlite3_value*);
void sqlite3ValueFree(sqlite3_value*);
sqlite3_value *sqlite3ValueNew(sqlite3 *);
char *sqlite3Utf16to8(sqlite3 *, const void*, int, u8);
int sqlite3ValueFromExpr(sqlite3 *, Expr *, u8, u8, sqlite3_value **);
void sqlite3ValueApplyAffinity(sqlite3_value *, u8, u8);
................................................................................
#ifndef SQLITE_AMALGAMATION
extern const unsigned char sqlite3OpcodeProperty[];
extern const char sqlite3StrBINARY[];
extern const unsigned char sqlite3UpperToLower[];
extern const unsigned char sqlite3CtypeMap[];
extern const Token sqlite3IntTokens[];
extern SQLITE_WSD struct Sqlite3Config sqlite3Config;
extern SQLITE_WSD FuncDefHash sqlite3GlobalFunctions;
#ifndef SQLITE_OMIT_WSD
extern int sqlite3PendingByte;
#endif
#endif
void sqlite3RootPageMoved(sqlite3*, int, int, int);
void sqlite3Reindex(Parse*, Token*, Token*);
void sqlite3AlterFunctions(void);
................................................................................
KeyInfo *sqlite3KeyInfoAlloc(sqlite3*,int,int);
void sqlite3KeyInfoUnref(KeyInfo*);
KeyInfo *sqlite3KeyInfoRef(KeyInfo*);
KeyInfo *sqlite3KeyInfoOfIndex(Parse*, Index*);
#ifdef SQLITE_DEBUG
int sqlite3KeyInfoIsWriteable(KeyInfo*);
#endif
int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *, 
  void (*)(sqlite3_context*,int,sqlite3_value **),
  void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*),
  FuncDestructor *pDestructor
);
void sqlite3OomFault(sqlite3*);
void sqlite3OomClear(sqlite3*);
int sqlite3ApiExit(sqlite3 *db, int);
................................................................................

#ifdef SQLITE_OMIT_VIRTUALTABLE
#  define sqlite3VtabClear(Y)
#  define sqlite3VtabSync(X,Y) SQLITE_OK
#  define sqlite3VtabRollback(X)
#  define sqlite3VtabCommit(X)
#  define sqlite3VtabInSync(db) 0
#  define sqlite3VtabLock(X) 
#  define sqlite3VtabUnlock(X)
#  define sqlite3VtabUnlockList(X)
#  define sqlite3VtabSavepoint(X, Y, Z) SQLITE_OK
#  define sqlite3GetVTable(X,Y)  ((VTable*)0)
#else
   void sqlite3VtabClear(sqlite3 *db, Table*);
   void sqlite3VtabDisconnect(sqlite3 *db, Table *p);
................................................................................
#define sqlite3WithDelete(x,y)
#endif

/* Declarations for functions in fkey.c. All of these are replaced by
** no-op macros if OMIT_FOREIGN_KEY is defined. In this case no foreign
** key functionality is available. If OMIT_TRIGGER is defined but
** OMIT_FOREIGN_KEY is not, only some of the functions are no-oped. In
** this case foreign keys are parsed, but no other functionality is 
** provided (enforcement of FK constraints requires the triggers sub-system).
*/
#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
  void sqlite3FkCheck(Parse*, Table*, int, int, int*, int);
  void sqlite3FkDropTable(Parse*, SrcList *, Table*);
  void sqlite3FkActions(Parse*, Table*, ExprList*, int, int*, int);
  int sqlite3FkRequired(Parse*, Table*, int*, int);
................................................................................
#ifdef SQLITE_DEBUG
  void sqlite3ParserTrace(FILE*, char *);
#endif

/*
** If the SQLITE_ENABLE IOTRACE exists then the global variable
** sqlite3IoTrace is a pointer to a printf-like routine used to
** print I/O tracing messages. 
*/
#ifdef SQLITE_ENABLE_IOTRACE
# define IOTRACE(A)  if( sqlite3IoTrace ){ sqlite3IoTrace A; }
  void sqlite3VdbeIOTraceSql(Vdbe*);
SQLITE_API SQLITE_EXTERN void (SQLITE_CDECL *sqlite3IoTrace)(const char*,...);
#else
# define IOTRACE(A)
................................................................................
** Perhaps the most important point is the difference between MEMTYPE_HEAP
** and MEMTYPE_LOOKASIDE.  If an allocation is MEMTYPE_LOOKASIDE, that means
** it might have been allocated by lookaside, except the allocation was
** too large or lookaside was already full.  It is important to verify
** that allocations that might have been satisfied by lookaside are not
** passed back to non-lookaside free() routines.  Asserts such as the
** example above are placed on the non-lookaside free() routines to verify
** this constraint. 
**
** All of this is no-op for a production build.  It only comes into
** play when the SQLITE_MEMDEBUG compile-time option is used.
*/
#ifdef SQLITE_MEMDEBUG
  void sqlite3MemdebugSetType(void*,u8);
  int sqlite3MemdebugHasType(void*,u8);

*************************************************************************
** Internal interface definitions for SQLite.
**
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Make sure that rand_s() is available on Windows systems with MSVC 2005
** or higher.
*/
#if defined(_MSC_VER) && _MSC_VER>=1400
#  define _CRT_RAND_S
#endif

/*
** Include the header file used to customize the compiler options for MSVC.
** This should be done first so that it can successfully prevent spurious
** compiler warnings due to subsequent content in this file and other files
** that are included by this file.
*/
#include "msvc.h"
................................................................................

/*
** The following macros are used to cast pointers to integers and
** integers to pointers.  The way you do this varies from one compiler
** to the next, so we have developed the following set of #if statements
** to generate appropriate macros for a wide range of compilers.
**
** The correct "ANSI" way to do this is to use the intptr_t type.
** Unfortunately, that typedef is not available on all compilers, or
** if it is available, it requires an #include of specific headers
** that vary from one machine to the next.
**
** Ticket #3860:  The llvm-gcc-4.2 compiler from Apple chokes on
** the ((void*)&((char*)0)[X]) construct.  But MSVC chokes on ((void*)(X)).
** So we have to define the macros in different ways depending on the
................................................................................
**
** Setting NDEBUG makes the code smaller and faster by disabling the
** assert() statements in the code.  So we want the default action
** to be for NDEBUG to be set and NDEBUG to be undefined only if SQLITE_DEBUG
** is set.  Thus NDEBUG becomes an opt-in rather than an opt-out
** feature.
*/
#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
# define NDEBUG 1
#endif
#if defined(NDEBUG) && defined(SQLITE_DEBUG)
# undef NDEBUG
#endif

/*
................................................................................
** Enable SQLITE_ENABLE_EXPLAIN_COMMENTS if SQLITE_DEBUG is turned on.
*/
#if !defined(SQLITE_ENABLE_EXPLAIN_COMMENTS) && defined(SQLITE_DEBUG)
# define SQLITE_ENABLE_EXPLAIN_COMMENTS 1
#endif

/*
** The testcase() macro is used to aid in coverage testing.  When
** doing coverage testing, the condition inside the argument to
** testcase() must be evaluated both true and false in order to
** get full branch coverage.  The testcase() macro is inserted
** to help ensure adequate test coverage in places where simple
** condition/decision coverage is inadequate.  For example, testcase()
** can be used to make sure boundary values are tested.  For
** bitmask tests, testcase() can be used to make sure each bit
................................................................................
#ifndef NDEBUG
# define VVA_ONLY(X)  X
#else
# define VVA_ONLY(X)
#endif

/*
** The ALWAYS and NEVER macros surround boolean expressions which
** are intended to always be true or false, respectively.  Such
** expressions could be omitted from the code completely.  But they
** are included in a few cases in order to enhance the resilience
** of SQLite to unexpected behavior - to make the code "self-healing"
** or "ductile" rather than being "brittle" and crashing at the first
** hint of unplanned behavior.
**
................................................................................
#endif
#ifndef SQLITE_BIG_DBL
# define SQLITE_BIG_DBL (1e99)
#endif

/*
** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0
** afterward. Having this macro allows us to cause the C compiler
** to omit code used by TEMP tables without messy #ifndef statements.
*/
#ifdef SQLITE_OMIT_TEMPDB
#define OMIT_TEMPDB 1
#else
#define OMIT_TEMPDB 0
#endif
................................................................................
#ifndef SQLITE_TEMP_STORE
# define SQLITE_TEMP_STORE 1
# define SQLITE_TEMP_STORE_xc 1  /* Exclude from ctime.c */
#endif

/*
** If no value has been provided for SQLITE_MAX_WORKER_THREADS, or if
** SQLITE_TEMP_STORE is set to 3 (never use temporary files), set it
** to zero.
*/
#if SQLITE_TEMP_STORE==3 || SQLITE_THREADSAFE==0
# undef SQLITE_MAX_WORKER_THREADS
# define SQLITE_MAX_WORKER_THREADS 0
#endif
#ifndef SQLITE_MAX_WORKER_THREADS
................................................................................
** Examples:
**      1 -> 0              20 -> 43          10000 -> 132
**      2 -> 10             25 -> 46          25000 -> 146
**      3 -> 16            100 -> 66        1000000 -> 199
**      4 -> 20           1000 -> 99        1048576 -> 200
**     10 -> 33           1024 -> 100    4294967296 -> 320
**
** The LogEst can be negative to indicate fractional values.
** Examples:
**
**    0.5 -> -10           0.1 -> -33        0.0625 -> -40
*/
typedef INT16_TYPE LogEst;

/*
................................................................................
** Constants for the largest and smallest possible 64-bit signed integers.
** These macros are designed to work correctly on both 32-bit and 64-bit
** compilers.
*/
#define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)

/*
** Round up a number to the next larger multiple of 8.  This is used
** to force 8-byte alignment on 64-bit architectures.
*/
#define ROUND8(x)     (((x)+7)&~7)

/*
** Round down to the nearest multiple of 8
................................................................................
# define SELECTTRACE_ENABLED 1
#else
# define SELECTTRACE_ENABLED 0
#endif

/*
** An instance of the following structure is used to store the busy-handler
** callback for a given sqlite handle.
**
** The sqlite.busyHandler member of the sqlite struct contains the busy
** callback for the database handle. Each pager opened via the sqlite
** handle is passed a pointer to sqlite.busyHandler. The busy-handler
** callback is currently invoked only from within pager.c.
*/
typedef struct BusyHandler BusyHandler;
................................................................................
/*
** Determine if the argument is a power of two
*/
#define IsPowerOfTwo(X) (((X)&((X)-1))==0)

/*
** The following value as a destructor means to use sqlite3DbFree().
** The sqlite3DbFree() routine requires two parameters instead of the
** one parameter that destructors normally want.  So we have to introduce
** this magic value that the code knows to handle differently.  Any
** pointer will work here as long as it is distinct from SQLITE_STATIC
** and SQLITE_TRANSIENT.
*/
#define SQLITE_DYNAMIC   ((sqlite3_destructor_type)sqlite3MallocSize)

/*
** When SQLITE_OMIT_WSD is defined, it means that the target platform does
................................................................................
#ifdef SQLITE_OMIT_WSD
  #define SQLITE_WSD const
  #define GLOBAL(t,v) (*(t*)sqlite3_wsd_find((void*)&(v), sizeof(v)))
  #define sqlite3GlobalConfig GLOBAL(struct Sqlite3Config, sqlite3Config)
  int sqlite3_wsd_init(int N, int J);
  void *sqlite3_wsd_find(void *K, int L);
#else
  #define SQLITE_WSD
  #define GLOBAL(t,v) v
  #define sqlite3GlobalConfig sqlite3Config
#endif

/*
** The following macros are used to suppress compiler warnings and to
** make it clear to human readers when a function parameter is deliberately
** left unused within the body of a function. This usually happens when
** a function is called via a function pointer. For example the
** implementation of an SQL aggregate step callback may not use the
** parameter indicating the number of arguments passed to the aggregate,
** if it knows that this is enforced elsewhere.
**
** When a function parameter is not used at all within the body of a function,
** it is generally named "NotUsed" or "NotUsed2" to make things even clearer.
** However, these macros may also be used to suppress warnings related to
................................................................................
typedef struct VTable VTable;
typedef struct VtabCtx VtabCtx;
typedef struct Walker Walker;
typedef struct WhereInfo WhereInfo;
typedef struct With With;

/*
** Defer sourcing vdbe.h and btree.h until after the "u8" and
** "BusyHandler" typedefs. vdbe.h also requires a few of the opaque
** pointer types (i.e. FuncDef) defined above.
*/
#include "btree.h"
#include "vdbe.h"
#include "pager.h"
#include "pcache.h"
................................................................................
/*
** An instance of the following structure stores a database schema.
**
** Most Schema objects are associated with a Btree.  The exception is
** the Schema for the TEMP databaes (sqlite3.aDb[1]) which is free-standing.
** In shared cache mode, a single Schema object can be shared by multiple
** Btrees that refer to the same underlying BtShared object.
**
** Schema objects are automatically deallocated when the last Btree that
** references them is destroyed.   The TEMP Schema is manually freed by
** sqlite3_close().
*
** A thread must be holding a mutex on the corresponding Btree in order
** to access Schema content.  This implies that the thread must also be
** holding a mutex on the sqlite3 connection pointer that owns the Btree.
................................................................................
  u8 file_format;      /* Schema format version for this file */
  u8 enc;              /* Text encoding used by this database */
  u16 schemaFlags;     /* Flags associated with this schema */
  int cache_size;      /* Number of pages to use in the cache */
};

/*
** These macros can be used to test, set, or clear bits in the
** Db.pSchema->flags field.
*/
#define DbHasProperty(D,I,P)     (((D)->aDb[I].pSchema->schemaFlags&(P))==(P))
#define DbHasAnyProperty(D,I,P)  (((D)->aDb[I].pSchema->schemaFlags&(P))!=0)
#define DbSetProperty(D,I,P)     (D)->aDb[I].pSchema->schemaFlags|=(P)
#define DbClearProperty(D,I,P)   (D)->aDb[I].pSchema->schemaFlags&=~(P)

................................................................................
  void *pEnd;             /* First byte past end of available space */
};
struct LookasideSlot {
  LookasideSlot *pNext;    /* Next buffer in the list of free buffers */
};

/*
** A hash table for built-in function definitions.  (Application-defined
** functions use a regular table table from hash.h.)
**
** Hash each FuncDef structure into one of the FuncDefHash.a[] slots.
** Collisions are on the FuncDef.u.pHash chain.
*/
#define SQLITE_FUNC_HASH_SZ 23
struct FuncDefHash {
  FuncDef *a[SQLITE_FUNC_HASH_SZ];       /* Hash table for functions */
};

#ifdef SQLITE_USER_AUTHENTICATION
/*
** Information held in the "sqlite3" database connection object and used
** to manage user authentication.
*/
................................................................................
  int nVDestroy;                /* Number of active OP_VDestroy operations */
  int nExtension;               /* Number of loaded extensions */
  void **aExtension;            /* Array of shared library handles */
  void (*xTrace)(void*,const char*);        /* Trace function */
  void *pTraceArg;                          /* Argument to the trace function */
  void (*xProfile)(void*,const char*,u64);  /* Profiling function */
  void *pProfileArg;                        /* Argument to profile function */
  void *pCommitArg;                 /* Argument to xCommitCallback() */
  int (*xCommitCallback)(void*);    /* Invoked at every commit. */
  void *pRollbackArg;               /* Argument to xRollbackCallback() */
  void (*xRollbackCallback)(void*); /* Invoked at every commit. */
  void *pUpdateArg;
  void (*xUpdateCallback)(void*,int, const char*,const char*,sqlite_int64);
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
  void *pPreUpdateArg;          /* First argument to xPreUpdateCallback */
  void (*xPreUpdateCallback)(   /* Registered using sqlite3_preupdate_hook() */
    void*,sqlite3*,int,char const*,char const*,sqlite3_int64,sqlite3_int64
................................................................................
#ifndef SQLITE_OMIT_VIRTUALTABLE
  int nVTrans;                  /* Allocated size of aVTrans */
  Hash aModule;                 /* populated by sqlite3_create_module() */
  VtabCtx *pVtabCtx;            /* Context for active vtab connect/create */
  VTable **aVTrans;             /* Virtual tables with open transactions */
  VTable *pDisconnect;    /* Disconnect these in next sqlite3_prepare() */
#endif
  Hash aFunc;                   /* Hash table of connection functions */
  Hash aCollSeq;                /* All collating sequences */
  BusyHandler busyHandler;      /* Busy callback */
  Db aDbStatic[2];              /* Static space for the 2 default backends */
  Savepoint *pSavepoint;        /* List of active savepoints */
  int busyTimeout;              /* Busy handler timeout, in msec */
  int nSavepoint;               /* Number of non-transaction savepoints */
  int nStatement;               /* Number of nested statement-transactions  */
  i64 nDeferredCons;            /* Net deferred constraints this transaction. */
  i64 nDeferredImmCons;         /* Net deferred immediate constraints */
  int *pnBytesFreed;            /* If not NULL, increment this in DbFree() */
#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
  /* The following variables are all protected by the STATIC_MASTER
  ** mutex, not by sqlite3.mutex. They are used by code in notify.c.
  **
  ** When X.pUnlockConnection==Y, that means that X is waiting for Y to
  ** unlock so that it can proceed.
  **
  ** When X.pBlockingConnection==Y, that means that something that X tried
  ** tried to do recently failed with an SQLITE_LOCKED error due to locks
  ** held by Y.
................................................................................
#define SQLITE_MAGIC_SICK     0x4b771290  /* Error and awaiting close */
#define SQLITE_MAGIC_BUSY     0xf03b7906  /* Database currently in use */
#define SQLITE_MAGIC_ERROR    0xb5357930  /* An SQLITE_MISUSE error occurred */
#define SQLITE_MAGIC_ZOMBIE   0x64cffc7f  /* Close with last statement close */

/*
** Each SQL function is defined by an instance of the following
** structure.  For global built-in functions (ex: substr(), max(), count())
** a pointer to this structure is held in the sqlite3BuiltinFunctions object.

** For per-connection application-defined functions, a pointer to this
** structure is held in the db->aHash hash table.
**
** The u.pHash field is used by the global built-ins.  The u.pDestructor
** field is used by per-connection app-def functions.
*/
struct FuncDef {
  i8 nArg;             /* Number of arguments.  -1 means unlimited */
  u16 funcFlags;       /* Some combination of SQLITE_FUNC_* */
  void *pUserData;     /* User data parameter */
  FuncDef *pNext;      /* Next function with same name */
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**); /* func or agg-step */
  void (*xFinalize)(sqlite3_context*);                  /* Agg finalizer */
  const char *zName;   /* SQL name of the function. */
  union {
    FuncDef *pHash;      /* Next with a different name but the same hash */
    FuncDestructor *pDestructor;   /* Reference counted destructor function */
  } u;
};

/*
** This structure encapsulates a user-function destructor callback (as
** configured using create_function_v2()) and a reference counter. When
** create_function_v2() is called to create a function with a destructor,
** a single object of this type is allocated. FuncDestructor.nRef is set to
** the number of FuncDef objects created (either 1 or 3, depending on whether
** or not the specified encoding is SQLITE_ANY). The FuncDef.pDestructor
** member of each of the new FuncDef objects is set to point to the allocated
** FuncDestructor.
**
** Thereafter, when one of the FuncDef objects is deleted, the reference
** count on this object is decremented. When it reaches 0, the destructor
................................................................................
                                    ** single query - might change over time */

/*
** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
** used to create the initializers for the FuncDef structures.
**
**   FUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Used to create a scalar function definition of a function zName
**     implemented by C function xFunc that accepts nArg arguments. The
**     value passed as iArg is cast to a (void*) and made available
**     as the user-data (sqlite3_user_data()) for the function. If
**     argument bNC is true, then the SQLITE_FUNC_NEEDCOLL flag is set.
**
**   VFUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag.
**
**   DFUNCTION(zName, nArg, iArg, bNC, xFunc)
**     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag and
................................................................................
**   AGGREGATE(zName, nArg, iArg, bNC, xStep, xFinal)
**     Used to create an aggregate function definition implemented by
**     the C functions xStep and xFinal. The first four parameters
**     are interpreted in the same way as the first 4 parameters to
**     FUNCTION().
**
**   LIKEFUNC(zName, nArg, pArg, flags)
**     Used to create a scalar function definition of a function zName
**     that accepts nArg arguments and is implemented by a call to C
**     function likeFunc. Argument pArg is cast to a (void *) and made
**     available as the function user-data (sqlite3_user_data()). The
**     FuncDef.flags variable is set to the value passed as the flags
**     parameter.
*/
#define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, {0} }
#define VFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, {0} }
#define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, {0} }
#define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
  {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, {0} }
#define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   pArg, 0, xFunc, 0, #zName, }
#define LIKEFUNC(zName, nArg, arg, flags) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \
   (void *)arg, 0, likeFunc, 0, #zName, {0} }
#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName, {0}}
#define AGGREGATE2(zName, nArg, arg, nc, xStep, xFinal, extraFlags) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL)|extraFlags, \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName, {0}}

/*
** All current savepoints are stored in a linked list starting at
** sqlite3.pSavepoint. The first element in the list is the most recently
** opened savepoint. Savepoints are added to the list by the vdbe
** OP_Savepoint instruction.
*/
................................................................................
#define SQLITE_SO_UNDEFINED -1 /* No sort order specified */

/*
** Column affinity types.
**
** These used to have mnemonic name like 'i' for SQLITE_AFF_INTEGER and
** 't' for SQLITE_AFF_TEXT.  But we can save a little space and improve
** the speed a little by numbering the values consecutively.
**
** But rather than start with 0 or 1, we begin with 'A'.  That way,
** when multiple affinity types are concatenated into a string and
** used as the P4 operand, they will be more readable.
**
** Note also that the numeric types are grouped together so that testing
** for a numeric type is a single comparison.  And the BLOB type is first.
................................................................................
#define SQLITE_AFF_INTEGER  'D'
#define SQLITE_AFF_REAL     'E'

#define sqlite3IsNumericAffinity(X)  ((X)>=SQLITE_AFF_NUMERIC)

/*
** The SQLITE_AFF_MASK values masks off the significant bits of an
** affinity value.
*/
#define SQLITE_AFF_MASK     0x47

/*
** Additional bit values that can be ORed with an affinity without
** changing the affinity.
**
................................................................................
#define SQLITE_JUMPIFNULL   0x10  /* jumps if either operand is NULL */
#define SQLITE_STOREP2      0x20  /* Store result in reg[P2] rather than jump */
#define SQLITE_NULLEQ       0x80  /* NULL=NULL */
#define SQLITE_NOTNULL      0x90  /* Assert that operands are never NULL */

/*
** An object of this type is created for each virtual table present in
** the database schema.
**
** If the database schema is shared, then there is one instance of this
** structure for each database connection (sqlite3*) that uses the shared
** schema. This is because each database connection requires its own unique
** instance of the sqlite3_vtab* handle used to access the virtual table
** implementation. sqlite3_vtab* handles can not be shared between
** database connections, even when the rest of the in-memory database
** schema is shared, as the implementation often stores the database
** connection handle passed to it via the xConnect() or xCreate() method
** during initialization internally. This database connection handle may
** then be used by the virtual table implementation to access real tables
** within the database. So that they appear as part of the callers
** transaction, these accesses need to be made via the same database
** connection as that used to execute SQL operations on the virtual table.
**
** All VTable objects that correspond to a single table in a shared
** database schema are initially stored in a linked-list pointed to by
** the Table.pVTable member variable of the corresponding Table object.
** When an sqlite3_prepare() operation is required to access the virtual
** table, it searches the list for the VTable that corresponds to the
** database connection doing the preparing so as to use the correct
** sqlite3_vtab* handle in the compiled query.
**
** When an in-memory Table object is deleted (for example when the
** schema is being reloaded for some reason), the VTable objects are not
** deleted and the sqlite3_vtab* handles are not xDisconnect()ed
** immediately. Instead, they are moved from the Table.pVTable list to
** another linked list headed by the sqlite3.pDisconnect member of the
** corresponding sqlite3 structure. They are then deleted/xDisconnected
** next time a statement is prepared using said sqlite3*. This is done
** to avoid deadlock issues involving multiple sqlite3.mutex mutexes.
** Refer to comments above function sqlite3VtabUnlockList() for an
** explanation as to why it is safe to add an entry to an sqlite3.pDisconnect
** list without holding the corresponding sqlite3.mutex mutex.
**
** The memory for objects of this type is always allocated by
** sqlite3DbMalloc(), using the connection handle stored in VTable.db as
** the first argument.
*/
struct VTable {
  sqlite3 *db;              /* Database connection associated with this table */
  Module *pMod;             /* Pointer to module implementation */
  sqlite3_vtab *pVtab;      /* Pointer to vtab instance */
  int nRef;                 /* Number of pointers to this structure */
................................................................................
**
** RESTRICT, SETNULL, and CASCADE actions apply only to foreign keys.
** RESTRICT is the same as ABORT for IMMEDIATE foreign keys and the
** same as ROLLBACK for DEFERRED keys.  SETNULL means that the foreign
** key is set to NULL.  CASCADE means that a DELETE or UPDATE of the
** referenced table row is propagated into the row that holds the
** foreign key.
**
** The following symbolic values are used to record which type
** of action to take.
*/
#define OE_None     0   /* There is no constraint to check */
#define OE_Rollback 1   /* Fail the operation and rollback the transaction */
#define OE_Abort    2   /* Back out changes but do no rollback transaction */
#define OE_Fail     3   /* Stop the operation but leave all prior changes */
................................................................................
#define OE_Cascade  9   /* Cascade the changes */

#define OE_Default  10  /* Do whatever the default action is */


/*
** An instance of the following structure is passed as the first
** argument to sqlite3VdbeKeyCompare and is used to control the
** comparison of the two index keys.
**
** Note that aSortOrder[] and aColl[] have nField+1 slots.  There
** are nField slots for the columns of an index then one extra slot
** for the rowid at the end.
*/
struct KeyInfo {
................................................................................
** or greater than a key in the btree, respectively.  These are normally
** -1 and +1 respectively, but might be inverted to +1 and -1 if the b-tree
** is in DESC order.
**
** The key comparison functions actually return default_rc when they find
** an equals comparison.  default_rc can be -1, 0, or +1.  If there are
** multiple entries in the b-tree with the same key (when only looking
** at the first pKeyInfo->nFields,) then default_rc can be set to -1 to
** cause the search to find the last match, or +1 to cause the search to
** find the first match.
**
** The key comparison functions will set eqSeen to true if they ever
** get and equal results when comparing this structure to a b-tree record.
** When default_rc!=0, the search might end up on the record immediately
** before the first match or immediately after the last match.  The
................................................................................
**
**     CREATE TABLE Ex1(c1 int, c2 int, c3 text);
**     CREATE INDEX Ex2 ON Ex1(c3,c1);
**
** In the Table structure describing Ex1, nCol==3 because there are
** three columns in the table.  In the Index structure describing
** Ex2, nColumn==2 since 2 of the 3 columns of Ex1 are indexed.
** The value of aiColumn is {2, 0}.  aiColumn[0]==2 because the
** first column to be indexed (c3) has an index of 2 in Ex1.aCol[].
** The second column to be indexed (c1) has an index of 0 in
** Ex1.aCol[], hence Ex2.aiColumn[1]==0.
**
** The Index.onError field determines whether or not the indexed columns
** must be unique and what to do if they are not.  When Index.onError=OE_None,
** it means this is not a unique index.  Otherwise it is a unique index
** and the value of Index.onError indicate the which conflict resolution
** algorithm to employ whenever an attempt is made to insert a non-unique
** element.
**
** While parsing a CREATE TABLE or CREATE INDEX statement in order to
** generate VDBE code (as opposed to parsing one read from an sqlite_master
** table as part of parsing an existing database schema), transient instances
** of this structure may be created. In this case the Index.tnum variable is
................................................................................
/* The Index.aiColumn[] values are normally positive integer.  But
** there are some negative values that have special meaning:
*/
#define XN_ROWID     (-1)     /* Indexed column is the rowid */
#define XN_EXPR      (-2)     /* Indexed column is an expression */

/*
** Each sample stored in the sqlite_stat3 table is represented in memory
** using a structure of this type.  See documentation at the top of the
** analyze.c source file for additional information.
*/
struct IndexSample {
  void *p;          /* Pointer to sampled record */
  int n;            /* Size of record in bytes */
  tRowcnt *anEq;    /* Est. number of rows where the key equals this sample */
................................................................................
**
** Expr.op is the opcode. The integer parser token codes are reused
** as opcodes here. For example, the parser defines TK_GE to be an integer
** code representing the ">=" operator. This same integer code is reused
** to represent the greater-than-or-equal-to operator in the expression
** tree.
**
** If the expression is an SQL literal (TK_INTEGER, TK_FLOAT, TK_BLOB,
** or TK_STRING), then Expr.token contains the text of the SQL literal. If
** the expression is a variable (TK_VARIABLE), then Expr.token contains the
** variable name. Finally, if the expression is an SQL function (TK_FUNCTION),
** then Expr.token contains the name of the function.
**
** Expr.pRight and Expr.pLeft are the left and right subexpressions of a
** binary operator. Either or both may be NULL.
**
** Expr.x.pList is a list of arguments if the expression is an SQL function,
** a CASE expression or an IN expression of the form "<lhs> IN (<y>, <z>...)".
** Expr.x.pSelect is used if the expression is a sub-select or an expression of
** the form "<lhs> IN (SELECT ...)". If the EP_xIsSelect bit is set in the
** Expr.flags mask, then Expr.x.pSelect is valid. Otherwise, Expr.x.pList is
** valid.
**
** An expression of the form ID or ID.ID refers to a column in a table.
** For such expressions, Expr.op is set to TK_COLUMN and Expr.iTable is
** the integer cursor number of a VDBE cursor pointing to that table and
** Expr.iColumn is the column number for the specific column.  If the
** expression is used as a result in an aggregate SELECT, then the
** value is also stored in the Expr.iAgg column in the aggregate so that
** it can be accessed after all aggregates are computed.
**
** If the expression is an unbound variable marker (a question mark
** character '?' in the original SQL) then the Expr.iTable holds the index
** number for that variable.
**
** If the expression is a subquery then Expr.iColumn holds an integer
** register number containing the result of the subquery.  If the
** subquery gives a constant result, then iTable is -1.  If the subquery
** gives a different answer at different times during statement processing
** then iTable is the address of a subroutine that computes the subquery.
................................................................................
  union {
    char *zToken;          /* Token value. Zero terminated and dequoted */
    int iValue;            /* Non-negative integer value if EP_IntValue */
  } u;

  /* If the EP_TokenOnly flag is set in the Expr.flags mask, then no
  ** space is allocated for the fields below this point. An attempt to
  ** access them will result in a segfault or malfunction.
  *********************************************************************/

  Expr *pLeft;           /* Left subnode */
  Expr *pRight;          /* Right subnode */
  union {
    ExprList *pList;     /* op = IN, EXISTS, SELECT, CASE, FUNCTION, BETWEEN */
    Select *pSelect;     /* EP_xIsSelect and op = IN, EXISTS, SELECT */
................................................................................

/*
** Combinations of two or more EP_* flags
*/
#define EP_Propagate (EP_Collate|EP_Subquery) /* Propagate these bits up tree */

/*
** These macros can be used to test, set, or clear bits in the
** Expr.flags field.
*/
#define ExprHasProperty(E,P)     (((E)->flags&(P))!=0)
#define ExprHasAllProperty(E,P)  (((E)->flags&(P))==(P))
#define ExprSetProperty(E,P)     (E)->flags|=(P)
#define ExprClearProperty(E,P)   (E)->flags&=~(P)

................................................................................
#ifdef SQLITE_DEBUG
# define ExprSetVVAProperty(E,P)  (E)->flags|=(P)
#else
# define ExprSetVVAProperty(E,P)
#endif

/*
** Macros to determine the number of bytes required by a normal Expr
** struct, an Expr struct with the EP_Reduced flag set in Expr.flags
** and an Expr struct with the EP_TokenOnly flag set.
*/
#define EXPR_FULLSIZE           sizeof(Expr)           /* Full size */
#define EXPR_REDUCEDSIZE        offsetof(Expr,iTable)  /* Common features */
#define EXPR_TOKENONLYSIZE      offsetof(Expr,pLeft)   /* Fewer features */

/*
** Flags passed to the sqlite3ExprDup() function. See the header comment
** above sqlite3ExprDup() for details.
*/
#define EXPRDUP_REDUCE         0x0001  /* Used reduced-size Expr nodes */

/*
** A list of expressions.  Each expression may optionally have a
** name.  An expr/name combination can be used in several ways, such
................................................................................
/*
** The bitmask datatype defined below is used for various optimizations.
**
** Changing this from a 64-bit to a 32-bit type limits the number of
** tables in a join to 32 instead of 64.  But it also reduces the size
** of the library by 738 bytes on ix86.
*/
#ifdef SQLITE_BITMASK_TYPE
  typedef SQLITE_BITMASK_TYPE Bitmask;
#else
  typedef u64 Bitmask;
#endif

/*
** The number of bits in a Bitmask.  "BMS" means "BitMask Size".
*/
#define BMS  ((int)(sizeof(Bitmask)*8))

/*
................................................................................
#define WHERE_NO_AUTOINDEX     0x0080 /* Disallow automatic indexes */
#define WHERE_GROUPBY          0x0100 /* pOrderBy is really a GROUP BY */
#define WHERE_DISTINCTBY       0x0200 /* pOrderby is really a DISTINCT clause */
#define WHERE_WANT_DISTINCT    0x0400 /* All output needs to be distinct */
#define WHERE_SORTBYGROUP      0x0800 /* Support sqlite3WhereIsSorted() */
#define WHERE_REOPEN_IDX       0x1000 /* Try to use OP_ReopenIdx */
#define WHERE_ONEPASS_MULTIROW 0x2000 /* ONEPASS is ok with multiple rows */
#define WHERE_USE_LIMIT        0x4000 /* There is a constant LIMIT clause */

/* Allowed return values from sqlite3WhereIsDistinct()
*/
#define WHERE_DISTINCT_NOOP      0  /* DISTINCT keyword not used */
#define WHERE_DISTINCT_UNIQUE    1  /* No duplicates */
#define WHERE_DISTINCT_ORDERED   2  /* All duplicates are adjacent */
#define WHERE_DISTINCT_UNORDERED 3  /* Duplicates are scattered */
................................................................................
** names.  The context consists of a list of tables (the pSrcList) field and
** a list of named expression (pEList).  The named expression list may
** be NULL.  The pSrc corresponds to the FROM clause of a SELECT or
** to the table being operated on by INSERT, UPDATE, or DELETE.  The
** pEList corresponds to the result set of a SELECT and is NULL for
** other statements.
**
** NameContexts can be nested.  When resolving names, the inner-most
** context is searched first.  If no match is found, the next outer
** context is checked.  If there is still no match, the next context
** is checked.  This process continues until either a match is found
** or all contexts are check.  When a match is found, the nRef member of
** the context containing the match is incremented.
**
** Each subquery gets a new NameContext.  The pNext field points to the
** NameContext in the parent query.  Thus the process of scanning the
** NameContext list corresponds to searching through successively outer
** subqueries looking for a match.
*/
struct NameContext {
................................................................................
};

/*
** Allowed values for the NameContext, ncFlags field.
**
** Note:  NC_MinMaxAgg must have the same value as SF_MinMaxAgg and
** SQLITE_FUNC_MINMAX.
**
*/
#define NC_AllowAgg  0x0001  /* Aggregate functions are allowed here */
#define NC_HasAgg    0x0002  /* One or more aggregate functions seen */
#define NC_IsCheck   0x0004  /* True if resolving names in a CHECK constraint */
#define NC_InAggFunc 0x0008  /* True if analyzing arguments to an agg func */
#define NC_PartIdx   0x0010  /* True if resolving a partial index WHERE */
#define NC_IdxExpr   0x0020  /* True if resolving columns of CREATE INDEX */
................................................................................
** The KeyInfo for addrOpenTran[0] and [1] contains collating sequences
** for the result set.  The KeyInfo for addrOpenEphm[2] contains collating
** sequences for the ORDER BY clause.
*/
struct Select {
  ExprList *pEList;      /* The fields of the result */
  u8 op;                 /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */
  LogEst nSelectRow;     /* Estimated number of result rows */
  u32 selFlags;          /* Various SF_* values */
  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
#if SELECTTRACE_ENABLED
  char zSelName[12];     /* Symbolic name of this SELECT use for debugging */
#endif
  int addrOpenEphm[2];   /* OP_OpenEphem opcodes related to this select */

  SrcList *pSrc;         /* The FROM clause */
  Expr *pWhere;          /* The WHERE clause */
  ExprList *pGroupBy;    /* The GROUP BY clause */
  Expr *pHaving;         /* The HAVING clause */
  ExprList *pOrderBy;    /* The ORDER BY clause */
  Select *pPrior;        /* Prior select in a compound select statement */
  Select *pNext;         /* Next select to the left in a compound */
................................................................................
  With *pWith;           /* WITH clause attached to this select. Or NULL. */
};

/*
** Allowed values for Select.selFlags.  The "SF" prefix stands for
** "Select Flag".
*/
#define SF_Distinct       0x00001  /* Output should be DISTINCT */
#define SF_All            0x00002  /* Includes the ALL keyword */
#define SF_Resolved       0x00004  /* Identifiers have been resolved */
#define SF_Aggregate      0x00008  /* Contains aggregate functions */
#define SF_UsesEphemeral  0x00010  /* Uses the OpenEphemeral opcode */
#define SF_Expanded       0x00020  /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo    0x00040  /* FROM subqueries have Table metadata */
#define SF_Compound       0x00080  /* Part of a compound query */
#define SF_Values         0x00100  /* Synthesized from VALUES clause */
#define SF_MultiValue     0x00200  /* Single VALUES term with multiple rows */
#define SF_NestedFrom     0x00400  /* Part of a parenthesized FROM clause */
#define SF_MaybeConvert   0x00800  /* Need convertCompoundSelectToSubquery() */
#define SF_MinMaxAgg      0x01000  /* Aggregate containing min() or max() */
#define SF_Recursive      0x02000  /* The recursive part of a recursive CTE */
#define SF_FixedLimit     0x04000  /* nSelectRow set by a constant LIMIT */
#define SF_Converted      0x08000  /* By convertCompoundSelectToSubquery() */
#define SF_IncludeHidden  0x10000  /* Include hidden columns in output */


/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
**     SRT_Union       Store results as a key in a temporary index
**                     identified by pDest->iSDParm.
**
**     SRT_Except      Remove results from the temporary index pDest->iSDParm.
**
**     SRT_Exists      Store a 1 in memory cell pDest->iSDParm if the result
**                     set is not empty.
**
................................................................................
**
**     SRT_Mem         Only valid if the result is a single column.
**                     Store the first column of the first result row
**                     in register pDest->iSDParm then abandon the rest
**                     of the query.  This destination implies "LIMIT 1".
**
**     SRT_Set         The result must be a single column.  Store each
**                     row of result as the key in table pDest->iSDParm.
**                     Apply the affinity pDest->affSdst before storing
**                     results.  Used to implement "IN (SELECT ...)".
**
**     SRT_EphemTab    Create an temporary table pDest->iSDParm and store
**                     the result there. The cursor is left open after
**                     returning.  This is like SRT_Table except that
**                     this destination uses OP_OpenEphemeral to create
................................................................................
  int iSDParm;         /* A parameter used by the eDest disposal method */
  int iSdst;           /* Base register where results are written */
  int nSdst;           /* Number of registers allocated */
  ExprList *pOrderBy;  /* Key columns for SRT_Queue and SRT_DistQueue */
};

/*
** During code generation of statements that do inserts into AUTOINCREMENT
** tables, the following information is attached to the Table.u.autoInc.p
** pointer of each autoincrement table to record some side information that
** the code generator needs.  We have to keep per-table autoincrement
** information in case inserts are done within triggers.  Triggers do not
** normally coordinate their activities, but we do need to coordinate the
** loading and saving of autoincrement information.
*/
................................................................................
** Size of the column cache
*/
#ifndef SQLITE_N_COLCACHE
# define SQLITE_N_COLCACHE 10
#endif

/*
** At least one instance of the following structure is created for each
** trigger that may be fired while parsing an INSERT, UPDATE or DELETE
** statement. All such objects are stored in the linked list headed at
** Parse.pTriggerPrg and deleted once statement compilation has been
** completed.
**
** A Vdbe sub-program that implements the body and WHEN clause of trigger
** TriggerPrg.pTrigger, assuming a default ON CONFLICT clause of
** TriggerPrg.orconf, is stored in the TriggerPrg.pProgram variable.
** The Parse.pTriggerPrg list never contains two entries with the same
** values for both pTrigger and orconf.
**
** The TriggerPrg.aColmask[0] variable is set to a mask of old.* columns
** accessed (or set to 0 for triggers fired as a result of INSERT
** statements). Similarly, the TriggerPrg.aColmask[1] variable is set to
** a mask of new.* columns used by the program.
*/
struct TriggerPrg {
  Trigger *pTrigger;      /* Trigger this program was coded from */
  TriggerPrg *pNext;      /* Next entry in Parse.pTriggerPrg list */
  SubProgram *pProgram;   /* Program implementing pTrigger/orconf */
................................................................................
** carry around information that is global to the entire parse.
**
** The structure is divided into two parts.  When the parser and code
** generate call themselves recursively, the first part of the structure
** is constant but the second part is reset at the beginning and end of
** each recursion.
**
** The nTableLock and aTableLock variables are only used if the shared-cache
** feature is enabled (if sqlite3Tsd()->useSharedData is true). They are
** used to store the set of table-locks required by the statement being
** compiled. Function sqlite3TableLock() is used to add entries to the
** list.
*/
struct Parse {
  sqlite3 *db;         /* The main database structure */
................................................................................
#define OPFLAG_P2ISREG       0x10    /* P2 to OP_Open** is a register number */
#define OPFLAG_PERMUTE       0x01    /* OP_Compare: use the permutation */
#define OPFLAG_SAVEPOSITION  0x02    /* OP_Delete: keep cursor position */
#define OPFLAG_AUXDELETE     0x04    /* OP_Delete: index in a DELETE op */

/*
 * Each trigger present in the database schema is stored as an instance of
 * struct Trigger.
 *
 * Pointers to instances of struct Trigger are stored in two ways.
 * 1. In the "trigHash" hash table (part of the sqlite3* that represents the
 *    database). This allows Trigger structures to be retrieved by name.
 * 2. All triggers associated with a single table form a linked list, using the
 *    pNext member of struct Trigger. A pointer to the first element of the
 *    linked list is stored as the "pTrigger" member of the associated
 *    struct Table.
 *
 * The "step_list" member points to the first element of a linked list
................................................................................
  Schema *pTabSchema;     /* Schema containing the table */
  TriggerStep *step_list; /* Link list of trigger program steps             */
  Trigger *pNext;         /* Next trigger associated with the table */
};

/*
** A trigger is either a BEFORE or an AFTER trigger.  The following constants
** determine which.
**
** If there are multiple triggers, you might of some BEFORE and some AFTER.
** In that cases, the constants below can be ORed together.
*/
#define TRIGGER_BEFORE  1
#define TRIGGER_AFTER   2

/*
 * An instance of struct TriggerStep is used to store a single SQL statement
 * that is a part of a trigger-program.
 *
 * Instances of struct TriggerStep are stored in a singly linked list (linked
 * using the "pNext" member) referenced by the "step_list" member of the
 * associated struct Trigger instance. The first element of the linked list is
 * the first step of the trigger-program.
 *
 * The "op" member indicates whether this is a "DELETE", "INSERT", "UPDATE" or
 * "SELECT" statement. The meanings of the other members is determined by the
 * value of "op" as follows:
 *
 * (op == TK_INSERT)
 * orconf    -> stores the ON CONFLICT algorithm
 * pSelect   -> If this is an INSERT INTO ... SELECT ... statement, then
 *              this stores a pointer to the SELECT statement. Otherwise NULL.
 * zTarget   -> Dequoted name of the table to insert into.
 * pExprList -> If this is an INSERT INTO ... VALUES ... statement, then
 *              this stores values to be inserted. Otherwise NULL.
 * pIdList   -> If this is an INSERT INTO ... (<column-names>) VALUES ...
 *              statement, then this stores the column-names to be
 *              inserted into.
 *
 * (op == TK_DELETE)
 * zTarget   -> Dequoted name of the table to delete from.
 * pWhere    -> The WHERE clause of the DELETE statement if one is specified.
 *              Otherwise NULL.
 *
 * (op == TK_UPDATE)
 * zTarget   -> Dequoted name of the table to update.
 * pWhere    -> The WHERE clause of the UPDATE statement if one is specified.
 *              Otherwise NULL.
 * pExprList -> A list of the columns to update and the expressions to update
 *              them to. See sqlite3Update() documentation of "pChanges"
 *              argument.
 *
 */
struct TriggerStep {
  u8 op;               /* One of TK_DELETE, TK_UPDATE, TK_INSERT, TK_SELECT */
  u8 orconf;           /* OE_Rollback etc. */
  Trigger *pTrig;      /* The trigger that this step is a part of */
  Select *pSelect;     /* SELECT statement or RHS of INSERT INTO SELECT ... */
  char *zTarget;       /* Target table for DELETE, UPDATE, INSERT */
................................................................................
  TriggerStep *pNext;  /* Next in the link-list */
  TriggerStep *pLast;  /* Last element in link-list. Valid for 1st elem only */
};

/*
** The following structure contains information used by the sqliteFix...
** routines as they walk the parse tree to make database references
** explicit.
*/
typedef struct DbFixer DbFixer;
struct DbFixer {
  Parse *pParse;      /* The parsing context.  Error messages written here */
  Schema *pSchema;    /* Fix items to this schema */
  int bVarOnly;       /* Check for variable references only */
  const char *zDb;    /* Make sure all objects are contained in this database */
................................................................................
*/
int sqlite3CorruptError(int);
int sqlite3MisuseError(int);
int sqlite3CantopenError(int);
#define SQLITE_CORRUPT_BKPT sqlite3CorruptError(__LINE__)
#define SQLITE_MISUSE_BKPT sqlite3MisuseError(__LINE__)
#define SQLITE_CANTOPEN_BKPT sqlite3CantopenError(__LINE__)
#ifdef SQLITE_DEBUG
  int sqlite3NomemError(int);
  int sqlite3IoerrnomemError(int);
# define SQLITE_NOMEM_BKPT sqlite3NomemError(__LINE__)
# define SQLITE_IOERR_NOMEM_BKPT sqlite3IoerrnomemError(__LINE__)
#else
# define SQLITE_NOMEM_BKPT SQLITE_NOMEM
# define SQLITE_IOERR_NOMEM_BKPT SQLITE_IOERR_NOMEM
#endif

/*
** FTS3 and FTS4 both require virtual table support
*/
#if defined(SQLITE_OMIT_VIRTUALTABLE)
# undef SQLITE_ENABLE_FTS3
# undef SQLITE_ENABLE_FTS4
................................................................................
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
int sqlite3IsIdChar(u8);
#endif

/*
** Internal function prototypes
*/
int sqlite3StrICmp(const char*,const char*);
int sqlite3Strlen30(const char*);
#define sqlite3StrNICmp sqlite3_strnicmp

int sqlite3MallocInit(void);
void sqlite3MallocEnd(void);
void *sqlite3Malloc(u64);
void *sqlite3MallocZero(u64);
................................................................................
**
** The alloca() routine never returns NULL.  This will cause code paths
** that deal with sqlite3StackAlloc() failures to be unreachable.
*/
#ifdef SQLITE_USE_ALLOCA
# define sqlite3StackAllocRaw(D,N)   alloca(N)
# define sqlite3StackAllocZero(D,N)  memset(alloca(N), 0, N)
# define sqlite3StackFree(D,P)
#else
# define sqlite3StackAllocRaw(D,N)   sqlite3DbMallocRaw(D,N)
# define sqlite3StackAllocZero(D,N)  sqlite3DbMallocZero(D,N)
# define sqlite3StackFree(D,P)       sqlite3DbFree(D,P)
#endif

#ifdef SQLITE_ENABLE_MEMSYS3
................................................................................
void sqlite3SrcListDelete(sqlite3*, SrcList*);
Index *sqlite3AllocateIndexObject(sqlite3*,i16,int,char**);
Index *sqlite3CreateIndex(Parse*,Token*,Token*,SrcList*,ExprList*,int,Token*,
                          Expr*, int, int);
void sqlite3DropIndex(Parse*, SrcList*, int);
int sqlite3Select(Parse*, Select*, SelectDest*);
Select *sqlite3SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*,
                         Expr*,ExprList*,u32,Expr*,Expr*);
void sqlite3SelectDelete(sqlite3*, Select*);
Table *sqlite3SrcListLookup(Parse*, SrcList*);
int sqlite3IsReadOnly(Parse*, Table*, int);
void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);
#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
Expr *sqlite3LimitWhere(Parse*,SrcList*,Expr*,ExprList*,Expr*,Expr*,char*);
#endif
void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqlite3WhereBegin(Parse*,SrcList*,Expr*,ExprList*,ExprList*,u16,int);
void sqlite3WhereEnd(WhereInfo*);
LogEst sqlite3WhereOutputRowCount(WhereInfo*);
int sqlite3WhereIsDistinct(WhereInfo*);
int sqlite3WhereIsOrdered(WhereInfo*);
int sqlite3WhereIsSorted(WhereInfo*);
int sqlite3WhereContinueLabel(WhereInfo*);
int sqlite3WhereBreakLabel(WhereInfo*);
int sqlite3WhereOkOnePass(WhereInfo*, int*);
#define ONEPASS_OFF      0        /* Use of ONEPASS not allowed */
................................................................................
IdList *sqlite3IdListDup(sqlite3*,IdList*);
Select *sqlite3SelectDup(sqlite3*,Select*,int);
#if SELECTTRACE_ENABLED
void sqlite3SelectSetName(Select*,const char*);
#else
# define sqlite3SelectSetName(A,B)
#endif
void sqlite3InsertBuiltinFuncs(FuncDef*,int);
FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,u8,u8);
void sqlite3RegisterBuiltinFunctions(void);
void sqlite3RegisterDateTimeFunctions(void);
void sqlite3RegisterPerConnectionBuiltinFunctions(sqlite3*);
int sqlite3SafetyCheckOk(sqlite3*);
int sqlite3SafetyCheckSickOrOk(sqlite3*);
void sqlite3ChangeCookie(Parse*, int);

#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
void sqlite3MaterializeView(Parse*, Table*, Expr*, int);
#endif
................................................................................
#else
# define sqlite3FileSuffix3(X,Y)
#endif
u8 sqlite3GetBoolean(const char *z,u8);

const void *sqlite3ValueText(sqlite3_value*, u8);
int sqlite3ValueBytes(sqlite3_value*, u8);
void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8,
                        void(*)(void*));
void sqlite3ValueSetNull(sqlite3_value*);
void sqlite3ValueFree(sqlite3_value*);
sqlite3_value *sqlite3ValueNew(sqlite3 *);
char *sqlite3Utf16to8(sqlite3 *, const void*, int, u8);
int sqlite3ValueFromExpr(sqlite3 *, Expr *, u8, u8, sqlite3_value **);
void sqlite3ValueApplyAffinity(sqlite3_value *, u8, u8);
................................................................................
#ifndef SQLITE_AMALGAMATION
extern const unsigned char sqlite3OpcodeProperty[];
extern const char sqlite3StrBINARY[];
extern const unsigned char sqlite3UpperToLower[];
extern const unsigned char sqlite3CtypeMap[];
extern const Token sqlite3IntTokens[];
extern SQLITE_WSD struct Sqlite3Config sqlite3Config;
extern FuncDefHash sqlite3BuiltinFunctions;
#ifndef SQLITE_OMIT_WSD
extern int sqlite3PendingByte;
#endif
#endif
void sqlite3RootPageMoved(sqlite3*, int, int, int);
void sqlite3Reindex(Parse*, Token*, Token*);
void sqlite3AlterFunctions(void);
................................................................................
KeyInfo *sqlite3KeyInfoAlloc(sqlite3*,int,int);
void sqlite3KeyInfoUnref(KeyInfo*);
KeyInfo *sqlite3KeyInfoRef(KeyInfo*);
KeyInfo *sqlite3KeyInfoOfIndex(Parse*, Index*);
#ifdef SQLITE_DEBUG
int sqlite3KeyInfoIsWriteable(KeyInfo*);
#endif
int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *,
  void (*)(sqlite3_context*,int,sqlite3_value **),
  void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*),
  FuncDestructor *pDestructor
);
void sqlite3OomFault(sqlite3*);
void sqlite3OomClear(sqlite3*);
int sqlite3ApiExit(sqlite3 *db, int);
................................................................................

#ifdef SQLITE_OMIT_VIRTUALTABLE
#  define sqlite3VtabClear(Y)
#  define sqlite3VtabSync(X,Y) SQLITE_OK
#  define sqlite3VtabRollback(X)
#  define sqlite3VtabCommit(X)
#  define sqlite3VtabInSync(db) 0
#  define sqlite3VtabLock(X)
#  define sqlite3VtabUnlock(X)
#  define sqlite3VtabUnlockList(X)
#  define sqlite3VtabSavepoint(X, Y, Z) SQLITE_OK
#  define sqlite3GetVTable(X,Y)  ((VTable*)0)
#else
   void sqlite3VtabClear(sqlite3 *db, Table*);
   void sqlite3VtabDisconnect(sqlite3 *db, Table *p);
................................................................................
#define sqlite3WithDelete(x,y)
#endif

/* Declarations for functions in fkey.c. All of these are replaced by
** no-op macros if OMIT_FOREIGN_KEY is defined. In this case no foreign
** key functionality is available. If OMIT_TRIGGER is defined but
** OMIT_FOREIGN_KEY is not, only some of the functions are no-oped. In
** this case foreign keys are parsed, but no other functionality is
** provided (enforcement of FK constraints requires the triggers sub-system).
*/
#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
  void sqlite3FkCheck(Parse*, Table*, int, int, int*, int);
  void sqlite3FkDropTable(Parse*, SrcList *, Table*);
  void sqlite3FkActions(Parse*, Table*, ExprList*, int, int*, int);
  int sqlite3FkRequired(Parse*, Table*, int*, int);
................................................................................
#ifdef SQLITE_DEBUG
  void sqlite3ParserTrace(FILE*, char *);
#endif

/*
** If the SQLITE_ENABLE IOTRACE exists then the global variable
** sqlite3IoTrace is a pointer to a printf-like routine used to
** print I/O tracing messages.
*/
#ifdef SQLITE_ENABLE_IOTRACE
# define IOTRACE(A)  if( sqlite3IoTrace ){ sqlite3IoTrace A; }
  void sqlite3VdbeIOTraceSql(Vdbe*);
SQLITE_API SQLITE_EXTERN void (SQLITE_CDECL *sqlite3IoTrace)(const char*,...);
#else
# define IOTRACE(A)
................................................................................
** Perhaps the most important point is the difference between MEMTYPE_HEAP
** and MEMTYPE_LOOKASIDE.  If an allocation is MEMTYPE_LOOKASIDE, that means
** it might have been allocated by lookaside, except the allocation was
** too large or lookaside was already full.  It is important to verify
** that allocations that might have been satisfied by lookaside are not
** passed back to non-lookaside free() routines.  Asserts such as the
** example above are placed on the non-lookaside free() routines to verify
** this constraint.
**
** All of this is no-op for a production build.  It only comes into
** play when the SQLITE_MEMDEBUG compile-time option is used.
*/
#ifdef SQLITE_MEMDEBUG
  void sqlite3MemdebugSetType(void*,u8);
  int sqlite3MemdebugHasType(void*,u8);

      p->azResult[p->nData++] = z;
    }
    p->nRow++;
  }
  return 0;

malloc_failed:
  p->rc = SQLITE_NOMEM;
  return 1;
}

/*
** Query the database.  But instead of invoking a callback for each row,
** malloc() for space to hold the result and return the entire results
** at the conclusion of the call.
................................................................................
  res.nColumn = 0;
  res.nData = 1;
  res.nAlloc = 20;
  res.rc = SQLITE_OK;
  res.azResult = sqlite3_malloc64(sizeof(char*)*res.nAlloc );
  if( res.azResult==0 ){
     db->errCode = SQLITE_NOMEM;
     return SQLITE_NOMEM;
  }
  res.azResult[0] = 0;
  rc = sqlite3_exec(db, zSql, sqlite3_get_table_cb, &res, pzErrMsg);
  assert( sizeof(res.azResult[0])>= sizeof(res.nData) );
  res.azResult[0] = SQLITE_INT_TO_PTR(res.nData);
  if( (rc&0xff)==SQLITE_ABORT ){
    sqlite3_free_table(&res.azResult[1]);
................................................................................
  }
  if( res.nAlloc>res.nData ){
    char **azNew;
    azNew = sqlite3_realloc64( res.azResult, sizeof(char*)*res.nData );
    if( azNew==0 ){
      sqlite3_free_table(&res.azResult[1]);
      db->errCode = SQLITE_NOMEM;
      return SQLITE_NOMEM;
    }
    res.azResult = azNew;
  }
  *pazResult = &res.azResult[1];
  if( pnColumn ) *pnColumn = res.nColumn;
  if( pnRow ) *pnRow = res.nRow;
  return rc;

      p->azResult[p->nData++] = z;
    }
    p->nRow++;
  }
  return 0;

malloc_failed:
  p->rc = SQLITE_NOMEM_BKPT;
  return 1;
}

/*
** Query the database.  But instead of invoking a callback for each row,
** malloc() for space to hold the result and return the entire results
** at the conclusion of the call.
................................................................................
  res.nColumn = 0;
  res.nData = 1;
  res.nAlloc = 20;
  res.rc = SQLITE_OK;
  res.azResult = sqlite3_malloc64(sizeof(char*)*res.nAlloc );
  if( res.azResult==0 ){
     db->errCode = SQLITE_NOMEM;
     return SQLITE_NOMEM_BKPT;
  }
  res.azResult[0] = 0;
  rc = sqlite3_exec(db, zSql, sqlite3_get_table_cb, &res, pzErrMsg);
  assert( sizeof(res.azResult[0])>= sizeof(res.nData) );
  res.azResult[0] = SQLITE_INT_TO_PTR(res.nData);
  if( (rc&0xff)==SQLITE_ABORT ){
    sqlite3_free_table(&res.azResult[1]);
................................................................................
  }
  if( res.nAlloc>res.nData ){
    char **azNew;
    azNew = sqlite3_realloc64( res.azResult, sizeof(char*)*res.nData );
    if( azNew==0 ){
      sqlite3_free_table(&res.azResult[1]);
      db->errCode = SQLITE_NOMEM;
      return SQLITE_NOMEM_BKPT;
    }
    res.azResult = azNew;
  }
  *pazResult = &res.azResult[1];
  if( pnColumn ) *pnColumn = res.nColumn;
  if( pnRow ) *pnRow = res.nRow;
  return rc;

  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  i64 n;
  int rc;

  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 1, objv, "STMT IDX N");
    return TCL_ERROR;
  }

  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  Tcl_WideInt n;
  int rc;

  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 1, objv, "STMT IDX N");
    return TCL_ERROR;
  }

  int objc,                       /* Number of arguments */
  Tcl_Obj *CONST objv[]           /* Command arguments */
){
  sqlite3 *db;
  const char *zDb;
  const char *zTable;
  const char *zColumn;
  sqlite_int64 iRowid;
  int flags;
  const char *zVarname;
  int nVarname;

  sqlite3_blob *pBlob = (sqlite3_blob*)0xFFFFFFFF;
  int rc;

  int objc,                       /* Number of arguments */
  Tcl_Obj *CONST objv[]           /* Command arguments */
){
  sqlite3 *db;
  const char *zDb;
  const char *zTable;
  const char *zColumn;
  Tcl_WideInt iRowid;
  int flags;
  const char *zVarname;
  int nVarname;

  sqlite3_blob *pBlob = (sqlite3_blob*)0xFFFFFFFF;
  int rc;

  int nPrefix;
  const char *zDir;
  int nDir;
  char aWild[2] = { '\0', '\0' };

#if SQLITE_OS_WIN
  zRoot = sqlite3_mprintf("%s%c", getenv("SystemDrive"), '/');
  nRoot = strlen(zRoot);
  zPrefix = sqlite3_mprintf("%s", getenv("SystemDrive"));
  nPrefix = strlen(zPrefix);
#else
  zRoot = "/";
  nRoot = 1;
  zPrefix = "";
  nPrefix = 0;
#endif

  int nPrefix;
  const char *zDir;
  int nDir;
  char aWild[2] = { '\0', '\0' };

#if SQLITE_OS_WIN
  zRoot = sqlite3_mprintf("%s%c", getenv("SystemDrive"), '/');
  nRoot = sqlite3Strlen30(zRoot);
  zPrefix = sqlite3_mprintf("%s", getenv("SystemDrive"));
  nPrefix = sqlite3Strlen30(zPrefix);
#else
  zRoot = "/";
  nRoot = 1;
  zPrefix = "";
  nPrefix = 0;
#endif

  assert( ppThread!=0 );
  assert( xTask!=0 );
  /* This routine is never used in single-threaded mode */
  assert( sqlite3GlobalConfig.bCoreMutex!=0 );

  *ppThread = 0;
  p = sqlite3Malloc(sizeof(*p));
  if( p==0 ) return SQLITE_NOMEM;
  memset(p, 0, sizeof(*p));
  p->xTask = xTask;
  p->pIn = pIn;
  /* If the SQLITE_TESTCTRL_FAULT_INSTALL callback is registered to a 
  ** function that returns SQLITE_ERROR when passed the argument 200, that
  ** forces worker threads to run sequentially and deterministically 
  ** for testing purposes. */
................................................................................
}

/* Get the results of the thread */
int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){
  int rc;

  assert( ppOut!=0 );
  if( NEVER(p==0) ) return SQLITE_NOMEM;
  if( p->done ){
    *ppOut = p->pOut;
    rc = SQLITE_OK;
  }else{
    rc = pthread_join(p->tid, ppOut) ? SQLITE_ERROR : SQLITE_OK;
  }
  sqlite3_free(p);
................................................................................
){
  SQLiteThread *p;

  assert( ppThread!=0 );
  assert( xTask!=0 );
  *ppThread = 0;
  p = sqlite3Malloc(sizeof(*p));
  if( p==0 ) return SQLITE_NOMEM;
  /* If the SQLITE_TESTCTRL_FAULT_INSTALL callback is registered to a 
  ** function that returns SQLITE_ERROR when passed the argument 200, that
  ** forces worker threads to run sequentially and deterministically 
  ** (via the sqlite3FaultSim() term of the conditional) for testing
  ** purposes. */
  if( sqlite3GlobalConfig.bCoreMutex==0 || sqlite3FaultSim(200) ){
    memset(p, 0, sizeof(*p));
................................................................................

/* Get the results of the thread */
int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){
  DWORD rc;
  BOOL bRc;

  assert( ppOut!=0 );
  if( NEVER(p==0) ) return SQLITE_NOMEM;
  if( p->xTask==0 ){
    /* assert( p->id==GetCurrentThreadId() ); */
    rc = WAIT_OBJECT_0;
    assert( p->tid==0 );
  }else{
    assert( p->id!=0 && p->id!=GetCurrentThreadId() );
    rc = sqlite3Win32Wait((HANDLE)p->tid);
................................................................................
){
  SQLiteThread *p;

  assert( ppThread!=0 );
  assert( xTask!=0 );
  *ppThread = 0;
  p = sqlite3Malloc(sizeof(*p));
  if( p==0 ) return SQLITE_NOMEM;
  if( (SQLITE_PTR_TO_INT(p)/17)&1 ){
    p->xTask = xTask;
    p->pIn = pIn;
  }else{
    p->xTask = 0;
    p->pResult = xTask(pIn);
  }
................................................................................
  return SQLITE_OK;
}

/* Get the results of the thread */
int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){

  assert( ppOut!=0 );
  if( NEVER(p==0) ) return SQLITE_NOMEM;
  if( p->xTask ){
    *ppOut = p->xTask(p->pIn);
  }else{
    *ppOut = p->pResult;
  }
  sqlite3_free(p);

#if defined(SQLITE_TEST)
  {
    void *pTstAlloc = sqlite3Malloc(10);
    if (!pTstAlloc) return SQLITE_NOMEM;
    sqlite3_free(pTstAlloc);
  }
#endif

  return SQLITE_OK;
}

#endif /* !defined(SQLITE_THREADS_IMPLEMENTED) */
/****************************** End Single-Threaded *************************/
#endif /* SQLITE_MAX_WORKER_THREADS>0 */

  assert( ppThread!=0 );
  assert( xTask!=0 );
  /* This routine is never used in single-threaded mode */
  assert( sqlite3GlobalConfig.bCoreMutex!=0 );

  *ppThread = 0;
  p = sqlite3Malloc(sizeof(*p));
  if( p==0 ) return SQLITE_NOMEM_BKPT;
  memset(p, 0, sizeof(*p));
  p->xTask = xTask;
  p->pIn = pIn;
  /* If the SQLITE_TESTCTRL_FAULT_INSTALL callback is registered to a 
  ** function that returns SQLITE_ERROR when passed the argument 200, that
  ** forces worker threads to run sequentially and deterministically 
  ** for testing purposes. */
................................................................................
}

/* Get the results of the thread */
int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){
  int rc;

  assert( ppOut!=0 );
  if( NEVER(p==0) ) return SQLITE_NOMEM_BKPT;
  if( p->done ){
    *ppOut = p->pOut;
    rc = SQLITE_OK;
  }else{
    rc = pthread_join(p->tid, ppOut) ? SQLITE_ERROR : SQLITE_OK;
  }
  sqlite3_free(p);
................................................................................
){
  SQLiteThread *p;

  assert( ppThread!=0 );
  assert( xTask!=0 );
  *ppThread = 0;
  p = sqlite3Malloc(sizeof(*p));
  if( p==0 ) return SQLITE_NOMEM_BKPT;
  /* If the SQLITE_TESTCTRL_FAULT_INSTALL callback is registered to a 
  ** function that returns SQLITE_ERROR when passed the argument 200, that
  ** forces worker threads to run sequentially and deterministically 
  ** (via the sqlite3FaultSim() term of the conditional) for testing
  ** purposes. */
  if( sqlite3GlobalConfig.bCoreMutex==0 || sqlite3FaultSim(200) ){
    memset(p, 0, sizeof(*p));
................................................................................

/* Get the results of the thread */
int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){
  DWORD rc;
  BOOL bRc;

  assert( ppOut!=0 );
  if( NEVER(p==0) ) return SQLITE_NOMEM_BKPT;
  if( p->xTask==0 ){
    /* assert( p->id==GetCurrentThreadId() ); */
    rc = WAIT_OBJECT_0;
    assert( p->tid==0 );
  }else{
    assert( p->id!=0 && p->id!=GetCurrentThreadId() );
    rc = sqlite3Win32Wait((HANDLE)p->tid);
................................................................................
){
  SQLiteThread *p;

  assert( ppThread!=0 );
  assert( xTask!=0 );
  *ppThread = 0;
  p = sqlite3Malloc(sizeof(*p));
  if( p==0 ) return SQLITE_NOMEM_BKPT;
  if( (SQLITE_PTR_TO_INT(p)/17)&1 ){
    p->xTask = xTask;
    p->pIn = pIn;
  }else{
    p->xTask = 0;
    p->pResult = xTask(pIn);
  }
................................................................................
  return SQLITE_OK;
}

/* Get the results of the thread */
int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){

  assert( ppOut!=0 );
  if( NEVER(p==0) ) return SQLITE_NOMEM_BKPT;
  if( p->xTask ){
    *ppOut = p->xTask(p->pIn);
  }else{
    *ppOut = p->pResult;
  }
  sqlite3_free(p);

#if defined(SQLITE_TEST)
  {
    void *pTstAlloc = sqlite3Malloc(10);
    if (!pTstAlloc) return SQLITE_NOMEM_BKPT;
    sqlite3_free(pTstAlloc);
  }
#endif

  return SQLITE_OK;
}

#endif /* !defined(SQLITE_THREADS_IMPLEMENTED) */
/****************************** End Single-Threaded *************************/
#endif /* SQLITE_MAX_WORKER_THREADS>0 */

        *tokenType = TK_GT;
        return 1;
      }
    }
    case CC_BANG: {
      if( z[1]!='=' ){
        *tokenType = TK_ILLEGAL;
        return 2;
      }else{
        *tokenType = TK_NE;
        return 2;
      }
    }
    case CC_PIPE: {
      if( z[1]!='|' ){
................................................................................
        ** be an identifier instead */
        i++;
        break;
      }
      *tokenType = TK_ID;
      return keywordCode((char*)z, i, tokenType);
    }
#ifndef SQLITE_OMIT_BLOB_LITERAL
    case CC_X: {

      testcase( z[0]=='x' ); testcase( z[0]=='X' );
      if( z[1]=='\'' ){
        *tokenType = TK_BLOB;
        for(i=2; sqlite3Isxdigit(z[i]); i++){}
        if( z[i]!='\'' || i%2 ){
          *tokenType = TK_ILLEGAL;
          while( z[i] && z[i]!='\'' ){ i++; }
        }
        if( z[i] ) i++;
        return i;
      }

      /* If it is not a BLOB literal, then it must be an ID, since no
      ** SQL keywords start with the letter 'x'.  Fall through */
    }
#endif
    case CC_ID: {
      i = 1;
      break;
    }
    default: {
      *tokenType = TK_ILLEGAL;
      return 1;
................................................................................
  pParse->zTail = zSql;
  i = 0;
  assert( pzErrMsg!=0 );
  /* sqlite3ParserTrace(stdout, "parser: "); */
  pEngine = sqlite3ParserAlloc(sqlite3Malloc);
  if( pEngine==0 ){
    sqlite3OomFault(db);
    return SQLITE_NOMEM;
  }
  assert( pParse->pNewTable==0 );
  assert( pParse->pNewTrigger==0 );
  assert( pParse->nVar==0 );
  assert( pParse->nzVar==0 );
  assert( pParse->azVar==0 );
  while( zSql[i]!=0 ){
................................................................................
      }
      if( tokenType==TK_ILLEGAL ){
        sqlite3ErrorMsg(pParse, "unrecognized token: \"%T\"",
                        &pParse->sLastToken);
        break;
      }
    }else{
      if( tokenType==TK_SEMI ) pParse->zTail = &zSql[i];
      sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse);
      lastTokenParsed = tokenType;
      if( pParse->rc!=SQLITE_OK || db->mallocFailed ) break;
    }
  }
  assert( nErr==0 );

  if( pParse->rc==SQLITE_OK && db->mallocFailed==0 ){
    assert( zSql[i]==0 );
    if( lastTokenParsed!=TK_SEMI ){
      sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
      pParse->zTail = &zSql[i];
    }
    if( pParse->rc==SQLITE_OK && db->mallocFailed==0 ){
      sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
    }
  }
#ifdef YYTRACKMAXSTACKDEPTH
  sqlite3_mutex_enter(sqlite3MallocMutex());
................................................................................
  sqlite3StatusHighwater(SQLITE_STATUS_PARSER_STACK,
      sqlite3ParserStackPeak(pEngine)
  );
  sqlite3_mutex_leave(sqlite3MallocMutex());
#endif /* YYDEBUG */
  sqlite3ParserFree(pEngine, sqlite3_free);
  if( db->mallocFailed ){
    pParse->rc = SQLITE_NOMEM;
  }
  if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
    pParse->zErrMsg = sqlite3MPrintf(db, "%s", sqlite3ErrStr(pParse->rc));
  }
  assert( pzErrMsg!=0 );
  if( pParse->zErrMsg ){
    *pzErrMsg = pParse->zErrMsg;

        *tokenType = TK_GT;
        return 1;
      }
    }
    case CC_BANG: {
      if( z[1]!='=' ){
        *tokenType = TK_ILLEGAL;
        return 1;
      }else{
        *tokenType = TK_NE;
        return 2;
      }
    }
    case CC_PIPE: {
      if( z[1]!='|' ){
................................................................................
        ** be an identifier instead */
        i++;
        break;
      }
      *tokenType = TK_ID;
      return keywordCode((char*)z, i, tokenType);
    }

    case CC_X: {
#ifndef SQLITE_OMIT_BLOB_LITERAL
      testcase( z[0]=='x' ); testcase( z[0]=='X' );
      if( z[1]=='\'' ){
        *tokenType = TK_BLOB;
        for(i=2; sqlite3Isxdigit(z[i]); i++){}
        if( z[i]!='\'' || i%2 ){
          *tokenType = TK_ILLEGAL;
          while( z[i] && z[i]!='\'' ){ i++; }
        }
        if( z[i] ) i++;
        return i;
      }
#endif
      /* If it is not a BLOB literal, then it must be an ID, since no
      ** SQL keywords start with the letter 'x'.  Fall through */
    }

    case CC_ID: {
      i = 1;
      break;
    }
    default: {
      *tokenType = TK_ILLEGAL;
      return 1;
................................................................................
  pParse->zTail = zSql;
  i = 0;
  assert( pzErrMsg!=0 );
  /* sqlite3ParserTrace(stdout, "parser: "); */
  pEngine = sqlite3ParserAlloc(sqlite3Malloc);
  if( pEngine==0 ){
    sqlite3OomFault(db);
    return SQLITE_NOMEM_BKPT;
  }
  assert( pParse->pNewTable==0 );
  assert( pParse->pNewTrigger==0 );
  assert( pParse->nVar==0 );
  assert( pParse->nzVar==0 );
  assert( pParse->azVar==0 );
  while( zSql[i]!=0 ){
................................................................................
      }
      if( tokenType==TK_ILLEGAL ){
        sqlite3ErrorMsg(pParse, "unrecognized token: \"%T\"",
                        &pParse->sLastToken);
        break;
      }
    }else{

      sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse);
      lastTokenParsed = tokenType;
      if( pParse->rc!=SQLITE_OK || db->mallocFailed ) break;
    }
  }
  assert( nErr==0 );
  pParse->zTail = &zSql[i];
  if( pParse->rc==SQLITE_OK && db->mallocFailed==0 ){
    assert( zSql[i]==0 );
    if( lastTokenParsed!=TK_SEMI ){
      sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);

    }
    if( pParse->rc==SQLITE_OK && db->mallocFailed==0 ){
      sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
    }
  }
#ifdef YYTRACKMAXSTACKDEPTH
  sqlite3_mutex_enter(sqlite3MallocMutex());
................................................................................
  sqlite3StatusHighwater(SQLITE_STATUS_PARSER_STACK,
      sqlite3ParserStackPeak(pEngine)
  );
  sqlite3_mutex_leave(sqlite3MallocMutex());
#endif /* YYDEBUG */
  sqlite3ParserFree(pEngine, sqlite3_free);
  if( db->mallocFailed ){
    pParse->rc = SQLITE_NOMEM_BKPT;
  }
  if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
    pParse->zErrMsg = sqlite3MPrintf(db, "%s", sqlite3ErrStr(pParse->rc));
  }
  assert( pzErrMsg!=0 );
  if( pParse->zErrMsg ){
    *pzErrMsg = pParse->zErrMsg;

  pView = sqlite3TreeViewPush(pView, moreToFollow);
  if( p->pWith ){
    sqlite3TreeViewWith(pView, p->pWith, 1);
    cnt = 1;
    sqlite3TreeViewPush(pView, 1);
  }
  do{
    sqlite3TreeViewLine(pView, "SELECT%s%s (0x%p) selFlags=0x%x",
      ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
      ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""), p, p->selFlags

    );
    if( cnt++ ) sqlite3TreeViewPop(pView);
    if( p->pPrior ){
      n = 1000;
    }else{
      n = 0;
      if( p->pSrc && p->pSrc->nSrc ) n++;

  pView = sqlite3TreeViewPush(pView, moreToFollow);
  if( p->pWith ){
    sqlite3TreeViewWith(pView, p->pWith, 1);
    cnt = 1;
    sqlite3TreeViewPush(pView, 1);
  }
  do{
    sqlite3TreeViewLine(pView, "SELECT%s%s (0x%p) selFlags=0x%x nSelectRow=%d",
      ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
      ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""), p, p->selFlags,
      (int)p->nSelectRow
    );
    if( cnt++ ) sqlite3TreeViewPop(pView);
    if( p->pPrior ){
      n = 1000;
    }else{
      n = 0;
      if( p->pSrc && p->pSrc->nSrc ) n++;

  */
  if( pMem->enc!=SQLITE_UTF8 && desiredEnc!=SQLITE_UTF8 ){
    u8 temp;
    int rc;
    rc = sqlite3VdbeMemMakeWriteable(pMem);
    if( rc!=SQLITE_OK ){
      assert( rc==SQLITE_NOMEM );
      return SQLITE_NOMEM;
    }
    zIn = (u8*)pMem->z;
    zTerm = &zIn[pMem->n&~1];
    while( zIn<zTerm ){
      temp = *zIn;
      *zIn = *(zIn+1);
      zIn++;
................................................................................
  ** Variable zOut is set to point at the output buffer, space obtained
  ** from sqlite3_malloc().
  */
  zIn = (u8*)pMem->z;
  zTerm = &zIn[pMem->n];
  zOut = sqlite3DbMallocRaw(pMem->db, len);
  if( !zOut ){
    return SQLITE_NOMEM;
  }
  z = zOut;

  if( pMem->enc==SQLITE_UTF8 ){
    if( desiredEnc==SQLITE_UTF16LE ){
      /* UTF-8 -> UTF-16 Little-endian */
      while( zIn<zTerm ){

  */
  if( pMem->enc!=SQLITE_UTF8 && desiredEnc!=SQLITE_UTF8 ){
    u8 temp;
    int rc;
    rc = sqlite3VdbeMemMakeWriteable(pMem);
    if( rc!=SQLITE_OK ){
      assert( rc==SQLITE_NOMEM );
      return SQLITE_NOMEM_BKPT;
    }
    zIn = (u8*)pMem->z;
    zTerm = &zIn[pMem->n&~1];
    while( zIn<zTerm ){
      temp = *zIn;
      *zIn = *(zIn+1);
      zIn++;
................................................................................
  ** Variable zOut is set to point at the output buffer, space obtained
  ** from sqlite3_malloc().
  */
  zIn = (u8*)pMem->z;
  zTerm = &zIn[pMem->n];
  zOut = sqlite3DbMallocRaw(pMem->db, len);
  if( !zOut ){
    return SQLITE_NOMEM_BKPT;
  }
  z = zOut;

  if( pMem->enc==SQLITE_UTF8 ){
    if( desiredEnc==SQLITE_UTF16LE ){
      /* UTF-8 -> UTF-16 Little-endian */
      while( zIn<zTerm ){

** IMPLEMENTATION-OF: R-30243-02494 The sqlite3_stricmp() and
** sqlite3_strnicmp() APIs allow applications and extensions to compare
** the contents of two buffers containing UTF-8 strings in a
** case-independent fashion, using the same definition of "case
** independence" that SQLite uses internally when comparing identifiers.
*/
int sqlite3_stricmp(const char *zLeft, const char *zRight){
  register unsigned char *a, *b;
  if( zLeft==0 ){
    return zRight ? -1 : 0;
  }else if( zRight==0 ){
    return 1;
  }





  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;
  while( *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }

  return UpperToLower[*a] - UpperToLower[*b];





}
int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){
  register unsigned char *a, *b;
  if( zLeft==0 ){
    return zRight ? -1 : 0;
  }else if( zRight==0 ){
    return 1;
................................................................................
  testcase( p[0]&0x80 );
  return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
#endif
}
void sqlite3Put4byte(unsigned char *p, u32 v){
#if SQLITE_BYTEORDER==4321
  memcpy(p,&v,4);

#elif SQLITE_BYTEORDER==1234 && defined(__GNUC__) && GCC_VERSION>=4003000
  u32 x = __builtin_bswap32(v);
  memcpy(p,&x,4);

#elif SQLITE_BYTEORDER==1234 && defined(_MSC_VER) && _MSC_VER>=1300
  u32 x = _byteswap_ulong(v);
  memcpy(p,&x,4);
#else
  p[0] = (u8)(v>>24);
  p[1] = (u8)(v>>16);
  p[2] = (u8)(v>>8);
  p[3] = (u8)v;

** IMPLEMENTATION-OF: R-30243-02494 The sqlite3_stricmp() and
** sqlite3_strnicmp() APIs allow applications and extensions to compare
** the contents of two buffers containing UTF-8 strings in a
** case-independent fashion, using the same definition of "case
** independence" that SQLite uses internally when comparing identifiers.
*/
int sqlite3_stricmp(const char *zLeft, const char *zRight){

  if( zLeft==0 ){
    return zRight ? -1 : 0;
  }else if( zRight==0 ){
    return 1;
  }
  return sqlite3StrICmp(zLeft, zRight);
}
int sqlite3StrICmp(const char *zLeft, const char *zRight){
  unsigned char *a, *b;
  int c;
  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;

  for(;;){
    c = (int)UpperToLower[*a] - (int)UpperToLower[*b];
    if( c || *a==0 ) break;
    a++;
    b++;
  }
  return c;
}
int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){
  register unsigned char *a, *b;
  if( zLeft==0 ){
    return zRight ? -1 : 0;
  }else if( zRight==0 ){
    return 1;
................................................................................
  testcase( p[0]&0x80 );
  return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
#endif
}
void sqlite3Put4byte(unsigned char *p, u32 v){
#if SQLITE_BYTEORDER==4321
  memcpy(p,&v,4);
#elif SQLITE_BYTEORDER==1234 && !defined(SQLITE_DISABLE_INTRINSIC) \
    && defined(__GNUC__) && GCC_VERSION>=4003000
  u32 x = __builtin_bswap32(v);
  memcpy(p,&x,4);
#elif SQLITE_BYTEORDER==1234 && !defined(SQLITE_DISABLE_INTRINSIC) \
    && defined(_MSC_VER) && _MSC_VER>=1300
  u32 x = _byteswap_ulong(v);
  memcpy(p,&x,4);
#else
  p[0] = (u8)(v>>24);
  p[1] = (u8)(v>>16);
  p[2] = (u8)(v>>8);
  p[3] = (u8)v;

/*
** Execute zSql on database db. Return an error code.
*/
static int execSql(sqlite3 *db, char **pzErrMsg, const char *zSql){
  sqlite3_stmt *pStmt;
  VVA_ONLY( int rc; )
  if( !zSql ){
    return SQLITE_NOMEM;
  }
  if( SQLITE_OK!=sqlite3_prepare(db, zSql, -1, &pStmt, 0) ){
    sqlite3SetString(pzErrMsg, db, sqlite3_errmsg(db));
    return sqlite3_errcode(db);
  }
  VVA_ONLY( rc = ) sqlite3_step(pStmt);
  assert( rc!=SQLITE_ROW || (db->flags&SQLITE_CountRows) );
................................................................................
    db->nextPagesize = 0;
  }

  if( sqlite3BtreeSetPageSize(pTemp, sqlite3BtreeGetPageSize(pMain), nRes, 0)
   || (!isMemDb && sqlite3BtreeSetPageSize(pTemp, db->nextPagesize, nRes, 0))
   || NEVER(db->mallocFailed)
  ){
    rc = SQLITE_NOMEM;
    goto end_of_vacuum;
  }

#ifndef SQLITE_OMIT_AUTOVACUUM
  sqlite3BtreeSetAutoVacuum(pTemp, db->nextAutovac>=0 ? db->nextAutovac :
                                           sqlite3BtreeGetAutoVacuum(pMain));
#endif

/*
** Execute zSql on database db. Return an error code.
*/
static int execSql(sqlite3 *db, char **pzErrMsg, const char *zSql){
  sqlite3_stmt *pStmt;
  VVA_ONLY( int rc; )
  if( !zSql ){
    return SQLITE_NOMEM_BKPT;
  }
  if( SQLITE_OK!=sqlite3_prepare(db, zSql, -1, &pStmt, 0) ){
    sqlite3SetString(pzErrMsg, db, sqlite3_errmsg(db));
    return sqlite3_errcode(db);
  }
  VVA_ONLY( rc = ) sqlite3_step(pStmt);
  assert( rc!=SQLITE_ROW || (db->flags&SQLITE_CountRows) );
................................................................................
    db->nextPagesize = 0;
  }

  if( sqlite3BtreeSetPageSize(pTemp, sqlite3BtreeGetPageSize(pMain), nRes, 0)
   || (!isMemDb && sqlite3BtreeSetPageSize(pTemp, db->nextPagesize, nRes, 0))
   || NEVER(db->mallocFailed)
  ){
    rc = SQLITE_NOMEM_BKPT;
    goto end_of_vacuum;
  }

#ifndef SQLITE_OMIT_AUTOVACUUM
  sqlite3BtreeSetAutoVacuum(pTemp, db->nextAutovac>=0 ? db->nextAutovac :
                                           sqlite3BtreeGetAutoVacuum(pMain));
#endif

        }
      }
    }
    if( p->db->flags & SQLITE_VdbeTrace )  printf("VDBE Trace:\n");
  }
  sqlite3EndBenignMalloc();
#endif
  for(pOp=&aOp[p->pc]; rc==SQLITE_OK; pOp++){




    assert( pOp>=aOp && pOp<&aOp[p->nOp]);
#ifdef VDBE_PROFILE
    start = sqlite3Hwtime();
#endif
    nVmStep++;
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
    if( p->anExec ) p->anExec[(int)(pOp-aOp)]++;
................................................................................
  ** a return code SQLITE_ABORT.
  */
  if( db->xProgress!=0 && nVmStep>=nProgressLimit ){
    assert( db->nProgressOps!=0 );
    nProgressLimit = nVmStep + db->nProgressOps - (nVmStep%db->nProgressOps);
    if( db->xProgress(db->pProgressArg) ){
      rc = SQLITE_INTERRUPT;
      goto vdbe_error_halt;
    }
  }
#endif
  
  break;
}

................................................................................
  pOut = out2Prerelease(p, pOp);
  pOp->opcode = OP_String;
  pOp->p1 = sqlite3Strlen30(pOp->p4.z);

#ifndef SQLITE_OMIT_UTF16
  if( encoding!=SQLITE_UTF8 ){
    rc = sqlite3VdbeMemSetStr(pOut, pOp->p4.z, -1, SQLITE_UTF8, SQLITE_STATIC);


    if( rc==SQLITE_TOOBIG ) goto too_big;

    if( SQLITE_OK!=sqlite3VdbeChangeEncoding(pOut, encoding) ) goto no_mem;
    assert( pOut->szMalloc>0 && pOut->zMalloc==pOut->z );
    assert( VdbeMemDynamic(pOut)==0 );
    pOut->szMalloc = 0;
    pOut->flags |= MEM_Static;
    if( pOp->p4type==P4_DYNAMIC ){
      sqlite3DbFree(db, pOp->p4.z);
................................................................................
  /* Run the progress counter just before returning.
  */
  if( db->xProgress!=0
   && nVmStep>=nProgressLimit
   && db->xProgress(db->pProgressArg)!=0
  ){
    rc = SQLITE_INTERRUPT;
    goto vdbe_error_halt;
  }
#endif

  /* If this statement has violated immediate foreign key constraints, do
  ** not return the number of rows modified. And do not RELEASE the statement
  ** transaction. It needs to be rolled back.  */
  if( SQLITE_OK!=(rc = sqlite3VdbeCheckFk(p, 0)) ){
    assert( db->flags&SQLITE_CountRows );
    assert( p->usesStmtJournal );
    break;
  }

  /* If the SQLITE_CountRows flag is set in sqlite3.flags mask, then 
  ** DML statements invoke this opcode to return the number of rows 
  ** modified to the user. This is the only way that a VM that
  ** opens a statement transaction may invoke this opcode.
  **
................................................................................
  ** may lead to overlapping statement transactions.
  **
  ** The statement transaction is never a top-level transaction.  Hence
  ** the RELEASE call below can never fail.
  */
  assert( p->iStatement==0 || db->flags&SQLITE_CountRows );
  rc = sqlite3VdbeCloseStatement(p, SAVEPOINT_RELEASE);
  if( NEVER(rc!=SQLITE_OK) ){
    break;
  }

  /* Invalidate all ephemeral cursor row caches */
  p->cacheCtr = (p->cacheCtr + 2)|1;

  /* Make sure the results of the current row are \000 terminated
  ** and have an assigned type.  The results are de-ephemeralized as
  ** a side effect.
................................................................................

  /* If the function returned an error, throw an exception */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(pCtx->pOut));
      rc = pCtx->isError;
    }
    sqlite3VdbeDeleteAuxData(p, pCtx->iOp, pOp->p1);

  }

  /* Copy the result of the function into register P3 */
  if( pOut->flags & (MEM_Str|MEM_Blob) ){
    sqlite3VdbeChangeEncoding(pCtx->pOut, encoding);
    if( sqlite3VdbeMemTooBig(pCtx->pOut) ) goto too_big;
  }
................................................................................
  testcase( pOp->p2==SQLITE_AFF_INTEGER );
  testcase( pOp->p2==SQLITE_AFF_REAL );
  pIn1 = &aMem[pOp->p1];
  memAboutToChange(p, pIn1);
  rc = ExpandBlob(pIn1);
  sqlite3VdbeMemCast(pIn1, pOp->p2, encoding);
  UPDATE_MAX_BLOBSIZE(pIn1);

  break;
}
#endif /* SQLITE_OMIT_CAST */

/* Opcode: Lt P1 P2 P3 P4 P5
** Synopsis: if r[P1]<r[P3] goto P2
**
................................................................................
      ** types use so much data space that there can only be 4096 and 32 of
      ** them, respectively.  So the maximum header length results from a
      ** 3-byte type for each of the maximum of 32768 columns plus three
      ** extra bytes for the header length itself.  32768*3 + 3 = 98307.
      */
      if( offset > 98307 || offset > pC->payloadSize ){
        rc = SQLITE_CORRUPT_BKPT;
        goto op_column_error;
      }
    }

    /* The following goto is an optimization.  It can be omitted and
    ** everything will still work.  But OP_Column is measurably faster
    ** by skipping the subsequent conditional, which is always true.
    */
................................................................................
    */
    op_column_read_header:
    if( pC->iHdrOffset<aOffset[0] ){
      /* Make sure zData points to enough of the record to cover the header. */
      if( pC->aRow==0 ){
        memset(&sMem, 0, sizeof(sMem));
        rc = sqlite3VdbeMemFromBtree(pCrsr, 0, aOffset[0], !pC->isTable, &sMem);
        if( rc!=SQLITE_OK ) goto op_column_error;
        zData = (u8*)sMem.z;
      }else{
        zData = pC->aRow;
      }
  
      /* Fill in pC->aType[i] and aOffset[i] values through the p2-th field. */
      i = pC->nHdrParsed;
................................................................................
      ** (2) the entire header was used but not all data was used
      ** (3) the end of the data extends beyond the end of the record.
      */
      if( (zHdr>=zEndHdr && (zHdr>zEndHdr || offset64!=pC->payloadSize))
       || (offset64 > pC->payloadSize)
      ){
        rc = SQLITE_CORRUPT_BKPT;
        goto op_column_error;
      }
    }else{
      t = 0;
    }

    /* If after trying to extract new entries from the header, nHdrParsed is
    ** still not up to p2, that means that the record has fewer than p2
................................................................................
      ** So we might as well use bogus content rather than reading
      ** content from disk. */
      static u8 aZero[8];  /* This is the bogus content */
      sqlite3VdbeSerialGet(aZero, t, pDest);
    }else{
      rc = sqlite3VdbeMemFromBtree(pCrsr, aOffset[p2], len, !pC->isTable,
                                   pDest);
      if( rc==SQLITE_OK ){
        sqlite3VdbeSerialGet((const u8*)pDest->z, t, pDest);
        pDest->flags &= ~MEM_Ephem;
      }
    }
  }

op_column_out:
op_column_error:
  UPDATE_MAX_BLOBSIZE(pDest);
  REGISTER_TRACE(pOp->p3, pDest);
  break;
}

/* Opcode: Affinity P1 P2 * P4 *
** Synopsis: affinity(r[P1@P2])
................................................................................
  BtCursor *pCrsr;

  assert( p->apCsr[pOp->p1]->eCurType==CURTYPE_BTREE );
  pCrsr = p->apCsr[pOp->p1]->uc.pCursor;
  assert( pCrsr );
  nEntry = 0;  /* Not needed.  Only used to silence a warning. */
  rc = sqlite3BtreeCount(pCrsr, &nEntry);

  pOut = out2Prerelease(p, pOp);
  pOut->u.i = nEntry;
  break;
}
#endif

/* Opcode: Savepoint P1 * * P4 *
................................................................................

      if( !isTransaction || p1==SAVEPOINT_ROLLBACK ){
        rc = sqlite3VtabSavepoint(db, p1, iSavepoint);
        if( rc!=SQLITE_OK ) goto abort_due_to_error;
      }
    }
  }


  break;
}

/* Opcode: AutoCommit P1 P2 * * *
**
** Set the database auto-commit flag to P1 (1 or 0). If P2 is true, roll
................................................................................
    }else if( desiredAutoCommit && db->nVdbeWrite>0 ){
      /* If this instruction implements a COMMIT and other VMs are writing
      ** return an error indicating that the other VMs must complete first. 
      */
      sqlite3VdbeError(p, "cannot commit transaction - "
                          "SQL statements in progress");
      rc = SQLITE_BUSY;
      break;
    }else if( (rc = sqlite3VdbeCheckFk(p, 1))!=SQLITE_OK ){
      goto vdbe_return;
    }else{
      db->autoCommit = (u8)desiredAutoCommit;
    }
    if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
      p->pc = (int)(pOp - aOp);
................................................................................
  }else{
    sqlite3VdbeError(p,
        (!desiredAutoCommit)?"cannot start a transaction within a transaction":(
        (iRollback)?"cannot rollback - no transaction is active":
                   "cannot commit - no transaction is active"));
         
    rc = SQLITE_ERROR;

  }
  break;
}

/* Opcode: Transaction P1 P2 P3 P4 P5
**
** Begin a transaction on database P1 if a transaction is not already
................................................................................
    */
    if( db->aDb[pOp->p1].pSchema->schema_cookie!=iMeta ){
      sqlite3ResetOneSchema(db, pOp->p1);
    }
    p->expired = 1;
    rc = SQLITE_SCHEMA;
  }

  break;
}

/* Opcode: ReadCookie P1 P2 P3 * *
**
** Read cookie number P3 from database P1 and write it into register P2.
** P3==1 is the schema version.  P3==2 is the database format.
................................................................................
  }
  if( pOp->p1==1 ){
    /* Invalidate all prepared statements whenever the TEMP database
    ** schema is changed.  Ticket #1644 */
    sqlite3ExpirePreparedStatements(db);
    p->expired = 0;
  }

  break;
}

/* Opcode: OpenRead P1 P2 P3 P4 P5
** Synopsis: root=P2 iDb=P3
**
** Open a read-only cursor for the database table whose root page is
................................................................................
  assert( pOp->opcode==OP_OpenWrite || pOp->p5==0 || pOp->p5==OPFLAG_SEEKEQ );
  assert( p->bIsReader );
  assert( pOp->opcode==OP_OpenRead || pOp->opcode==OP_ReopenIdx
          || p->readOnly==0 );

  if( p->expired ){
    rc = SQLITE_ABORT_ROLLBACK;
    break;
  }

  nField = 0;
  pKeyInfo = 0;
  p2 = pOp->p2;
  iDb = pOp->p3;
  assert( iDb>=0 && iDb<db->nDb );
................................................................................
    assert( (pIn2->flags & MEM_Int)!=0 );
    sqlite3VdbeMemIntegerify(pIn2);
    p2 = (int)pIn2->u.i;
    /* The p2 value always comes from a prior OP_CreateTable opcode and
    ** that opcode will always set the p2 value to 2 or more or else fail.
    ** If there were a failure, the prepared statement would have halted
    ** before reaching this instruction. */
    if( NEVER(p2<2) ) {
      rc = SQLITE_CORRUPT_BKPT;
      goto abort_due_to_error;
    }
  }
  if( pOp->p4type==P4_KEYINFO ){
    pKeyInfo = pOp->p4.pKeyInfo;
    assert( pKeyInfo->enc==ENC(db) );
    assert( pKeyInfo->db==db );
    nField = pKeyInfo->nField+pKeyInfo->nXField;
  }else if( pOp->p4type==P4_INT32 ){
................................................................................
  assert( OPFLAG_SEEKEQ==BTREE_SEEK_EQ );
  testcase( pOp->p5 & OPFLAG_BULKCSR );
#ifdef SQLITE_ENABLE_CURSOR_HINTS
  testcase( pOp->p2 & OPFLAG_SEEKEQ );
#endif
  sqlite3BtreeCursorHintFlags(pCur->uc.pCursor,
                               (pOp->p5 & (OPFLAG_BULKCSR|OPFLAG_SEEKEQ)));

  break;
}

/* Opcode: OpenEphemeral P1 P2 * P4 P5
** Synopsis: nColumn=P2
**
** Open a new cursor P1 to a transient table.
................................................................................
      pCx->isTable = 0;
    }else{
      rc = sqlite3BtreeCursor(pCx->pBt, MASTER_ROOT, BTREE_WRCSR,
                              0, pCx->uc.pCursor);
      pCx->isTable = 1;
    }
  }

  pCx->isOrdered = (pOp->p5!=BTREE_UNORDERED);
  break;
}

/* Opcode: SorterOpen P1 P2 P3 P4 *
**
** This opcode works like OP_OpenEphemeral except that it opens
................................................................................
  assert( pOp->p2>=0 );
  pCx = allocateCursor(p, pOp->p1, pOp->p2, -1, CURTYPE_SORTER);
  if( pCx==0 ) goto no_mem;
  pCx->pKeyInfo = pOp->p4.pKeyInfo;
  assert( pCx->pKeyInfo->db==db );
  assert( pCx->pKeyInfo->enc==ENC(db) );
  rc = sqlite3VdbeSorterInit(db, pOp->p3, pCx);

  break;
}

/* Opcode: SequenceTest P1 P2 * * *
** Synopsis: if( cursor[P1].ctr++ ) pc = P2
**
** P1 is a sorter cursor. If the sequence counter is currently zero, jump
................................................................................
        break;
      }
    }
  }
  rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, pIdxKey, 0, 0, &res);
  sqlite3DbFree(db, pFree);
  if( rc!=SQLITE_OK ){
    break;
  }
  pC->seekResult = res;
  alreadyExists = (res==0);
  pC->nullRow = 1-alreadyExists;
  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  if( pOp->opcode==OP_Found ){
................................................................................
    assert( rc==SQLITE_OK );
    if( pOp->p2==0 ){
      rc = SQLITE_CORRUPT_BKPT;
    }else{
      goto jump_to_p2;
    }
  }

  break;
}

/* Opcode: Sequence P1 P2 * * *
** Synopsis: r[P2]=cursor[P1].ctr++
**
** Find the next available sequence number for cursor P1.
................................................................................
      do{
        sqlite3_randomness(sizeof(v), &v);
        v &= (MAX_ROWID>>1); v++;  /* Ensure that v is greater than zero */
      }while(  ((rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)v,
                                                 0, &res))==SQLITE_OK)
            && (res==0)
            && (++cnt<100));

      if( rc==SQLITE_OK && res==0 ){
        rc = SQLITE_FULL;   /* IMP: R-38219-53002 */
        goto abort_due_to_error;
      }
      assert( v>0 );  /* EV: R-40812-03570 */
    }
    pC->deferredMoveto = 0;
    pC->cacheStatus = CACHE_STALE;
................................................................................
                          pData->z, pData->n, nZero,
                          (pOp->p5 & OPFLAG_APPEND)!=0, seekResult
  );
  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;

  /* Invoke the update-hook if required. */

  if( rc==SQLITE_OK && db->xUpdateCallback && op && HasRowid(pTab) ){
    db->xUpdateCallback(db->pUpdateArg, op, zDb, pTab->zName, iKey);
  }
  break;
}

/* Opcode: Delete P1 P2 P3 P4 P5
**
................................................................................
      nExtraDelete--;
    }
  }
#endif

  rc = sqlite3BtreeDelete(pC->uc.pCursor, pOp->p5);
  pC->cacheStatus = CACHE_STALE;


  /* Invoke the update-hook if required. */
  if( opflags & OPFLAG_NCHANGE ){
    p->nChange++;
    if( rc==SQLITE_OK && db->xUpdateCallback && HasRowid(pTab) ){
      db->xUpdateCallback(db->pUpdateArg, SQLITE_DELETE, zDb, pTab->zName,
          pC->movetoTarget);
................................................................................
  assert( isSorter(pC) );
  assert( pOp->p4type==P4_INT32 );
  pIn3 = &aMem[pOp->p3];
  nKeyCol = pOp->p4.i;
  res = 0;
  rc = sqlite3VdbeSorterCompare(pC, pIn3, nKeyCol, &res);
  VdbeBranchTaken(res!=0,2);

  if( res ) goto jump_to_p2;
  break;
};

/* Opcode: SorterData P1 P2 P3 * *
** Synopsis: r[P2]=data
**
................................................................................

  pOut = &aMem[pOp->p2];
  pC = p->apCsr[pOp->p1];
  assert( isSorter(pC) );
  rc = sqlite3VdbeSorterRowkey(pC, pOut);
  assert( rc!=SQLITE_OK || (pOut->flags & MEM_Blob) );
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );

  p->apCsr[pOp->p3]->cacheStatus = CACHE_STALE;
  break;
}

/* Opcode: RowData P1 P2 * * *
** Synopsis: r[P2]=data
**
................................................................................
  pOut->n = n;
  MemSetTypeFlag(pOut, MEM_Blob);
  if( pC->isTable==0 ){
    rc = sqlite3BtreeKey(pCrsr, 0, n, pOut->z);
  }else{
    rc = sqlite3BtreeData(pCrsr, 0, n, pOut->z);
  }

  pOut->enc = SQLITE_UTF8;  /* In case the blob is ever cast to text */
  UPDATE_MAX_BLOBSIZE(pOut);
  REGISTER_TRACE(pOp->p2, pOut);
  break;
}

/* Opcode: Rowid P1 P2 * * *
................................................................................
  }else if( pC->eCurType==CURTYPE_VTAB ){
    assert( pC->uc.pVCur!=0 );
    pVtab = pC->uc.pVCur->pVtab;
    pModule = pVtab->pModule;
    assert( pModule->xRowid );
    rc = pModule->xRowid(pC->uc.pVCur, &v);
    sqlite3VtabImportErrmsg(p, pVtab);

#endif /* SQLITE_OMIT_VIRTUALTABLE */
  }else{
    assert( pC->eCurType==CURTYPE_BTREE );
    assert( pC->uc.pCursor!=0 );
    rc = sqlite3VdbeCursorRestore(pC);
    if( rc ) goto abort_due_to_error;
    if( pC->nullRow ){
................................................................................
  pC->nullRow = (u8)res;
  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  pC->seekResult = pOp->p3;
#ifdef SQLITE_DEBUG
  pC->seekOp = OP_Last;
#endif

  if( pOp->p2>0 ){
    VdbeBranchTaken(res!=0,2);
    if( res ) goto jump_to_p2;
  }
  break;
}

................................................................................
    assert( pC->eCurType==CURTYPE_BTREE );
    pCrsr = pC->uc.pCursor;
    assert( pCrsr );
    rc = sqlite3BtreeFirst(pCrsr, &res);
    pC->deferredMoveto = 0;
    pC->cacheStatus = CACHE_STALE;
  }

  pC->nullRow = (u8)res;
  assert( pOp->p2>0 && pOp->p2<p->nOp );
  VdbeBranchTaken(res!=0,2);
  if( res ) goto jump_to_p2;
  break;
}

................................................................................
       || pC->seekOp==OP_SeekLT || pC->seekOp==OP_SeekLE
       || pC->seekOp==OP_Last );

  rc = pOp->p4.xAdvance(pC->uc.pCursor, &res);
next_tail:
  pC->cacheStatus = CACHE_STALE;
  VdbeBranchTaken(res==0,2);

  if( res==0 ){
    pC->nullRow = 0;
    p->aCounter[pOp->p5]++;
#ifdef SQLITE_TEST
    sqlite3_search_count++;
#endif
    goto jump_to_p2_and_check_for_interrupt;
................................................................................
  assert( isSorter(pC)==(pOp->opcode==OP_SorterInsert) );
  pIn2 = &aMem[pOp->p2];
  assert( pIn2->flags & MEM_Blob );
  if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++;
  assert( pC->eCurType==CURTYPE_BTREE || pOp->opcode==OP_SorterInsert );
  assert( pC->isTable==0 );
  rc = ExpandBlob(pIn2);
  if( rc==SQLITE_OK ){
    if( pOp->opcode==OP_SorterInsert ){
      rc = sqlite3VdbeSorterWrite(pC, pIn2);
    }else{
      nKey = pIn2->n;
      zKey = pIn2->z;
      rc = sqlite3BtreeInsert(pC->uc.pCursor, zKey, nKey, "", 0, 0, pOp->p3, 
          ((pOp->p5 & OPFLAG_USESEEKRESULT) ? pC->seekResult : 0)
          );
      assert( pC->deferredMoveto==0 );
      pC->cacheStatus = CACHE_STALE;
    }
  }

  break;
}

/* Opcode: IdxDelete P1 P2 P3 * *
** Synopsis: key=r[P2@P3]
**
** The content of P3 registers starting at register P2 form
................................................................................
  assert( pCrsr!=0 );
  assert( pOp->p5==0 );
  r.pKeyInfo = pC->pKeyInfo;
  r.nField = (u16)pOp->p3;
  r.default_rc = 0;
  r.aMem = &aMem[pOp->p2];
  rc = sqlite3BtreeMovetoUnpacked(pCrsr, &r, 0, 0, &res);

  if( rc==SQLITE_OK && res==0 ){
    rc = sqlite3BtreeDelete(pCrsr, BTREE_AUXDELETE);

  }
  assert( pC->deferredMoveto==0 );
  pC->cacheStatus = CACHE_STALE;
  break;
}

/* Opcode: Seek P1 * P3 P4 *
................................................................................
    assert( pOp->opcode==OP_IdxLE || pOp->opcode==OP_IdxLT );
    res = -res;
  }else{
    assert( pOp->opcode==OP_IdxGE || pOp->opcode==OP_IdxGT );
    res++;
  }
  VdbeBranchTaken(res>0,2);

  if( res>0 ) goto jump_to_p2;
  break;
}

/* Opcode: Destroy P1 P2 P3 * *
**
** Delete an entire database table or index whose root page in the database
................................................................................
  assert( p->readOnly==0 );
  assert( pOp->p1>1 );
  pOut = out2Prerelease(p, pOp);
  pOut->flags = MEM_Null;
  if( db->nVdbeRead > db->nVDestroy+1 ){
    rc = SQLITE_LOCKED;
    p->errorAction = OE_Abort;

  }else{
    iDb = pOp->p3;
    assert( DbMaskTest(p->btreeMask, iDb) );
    iMoved = 0;  /* Not needed.  Only to silence a warning. */
    rc = sqlite3BtreeDropTable(db->aDb[iDb].pBt, pOp->p1, &iMoved);
    pOut->flags = MEM_Int;
    pOut->u.i = iMoved;

#ifndef SQLITE_OMIT_AUTOVACUUM
    if( rc==SQLITE_OK && iMoved!=0 ){
      sqlite3RootPageMoved(db, iDb, iMoved, pOp->p1);
      /* All OP_Destroy operations occur on the same btree */
      assert( resetSchemaOnFault==0 || resetSchemaOnFault==iDb+1 );
      resetSchemaOnFault = iDb+1;
    }
#endif
  }
................................................................................
    p->nChange += nChange;
    if( pOp->p3>0 ){
      assert( memIsValid(&aMem[pOp->p3]) );
      memAboutToChange(p, &aMem[pOp->p3]);
      aMem[pOp->p3].u.i += nChange;
    }
  }

  break;
}

/* Opcode: ResetSorter P1 * * * *
**
** Delete all contents from the ephemeral table or sorter
** that is open on cursor P1.
................................................................................
  assert( pC!=0 );
  if( isSorter(pC) ){
    sqlite3VdbeSorterReset(db, pC->uc.pSorter);
  }else{
    assert( pC->eCurType==CURTYPE_BTREE );
    assert( pC->isEphemeral );
    rc = sqlite3BtreeClearTableOfCursor(pC->uc.pCursor);

  }
  break;
}

/* Opcode: CreateTable P1 P2 * * *
** Synopsis: r[P2]=root iDb=P1
**
................................................................................
  if( pOp->opcode==OP_CreateTable ){
    /* flags = BTREE_INTKEY; */
    flags = BTREE_INTKEY;
  }else{
    flags = BTREE_BLOBKEY;
  }
  rc = sqlite3BtreeCreateTable(pDb->pBt, &pgno, flags);

  pOut->u.i = pgno;
  break;
}

/* Opcode: ParseSchema P1 * * P4 *
**
** Read and parse all entries from the SQLITE_MASTER table of database P1
................................................................................
    initData.db = db;
    initData.iDb = pOp->p1;
    initData.pzErrMsg = &p->zErrMsg;
    zSql = sqlite3MPrintf(db,
       "SELECT name, rootpage, sql FROM '%q'.%s WHERE %s ORDER BY rowid",
       db->aDb[iDb].zName, zMaster, pOp->p4.z);
    if( zSql==0 ){
      rc = SQLITE_NOMEM;
    }else{
      assert( db->init.busy==0 );
      db->init.busy = 1;
      initData.rc = SQLITE_OK;
      assert( !db->mallocFailed );
      rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0);
      if( rc==SQLITE_OK ) rc = initData.rc;
      sqlite3DbFree(db, zSql);
      db->init.busy = 0;
    }
  }

  if( rc ) sqlite3ResetAllSchemasOfConnection(db);
  if( rc==SQLITE_NOMEM ){
    goto no_mem;


  }
  break;  
}

#if !defined(SQLITE_OMIT_ANALYZE)
/* Opcode: LoadAnalysis P1 * * * *
**
................................................................................
** Read the sqlite_stat1 table for database P1 and load the content
** of that table into the internal index hash table.  This will cause
** the analysis to be used when preparing all subsequent queries.
*/
case OP_LoadAnalysis: {
  assert( pOp->p1>=0 && pOp->p1<db->nDb );
  rc = sqlite3AnalysisLoad(db, pOp->p1);

  break;  
}
#endif /* !defined(SQLITE_OMIT_ANALYZE) */

/* Opcode: DropTable P1 * * P4 *
**
** Remove the internal (in-memory) data structures that describe
................................................................................
    for(pFrame=p->pFrame; pFrame && pFrame->token!=t; pFrame=pFrame->pParent);
    if( pFrame ) break;
  }

  if( p->nFrame>=db->aLimit[SQLITE_LIMIT_TRIGGER_DEPTH] ){
    rc = SQLITE_ERROR;
    sqlite3VdbeError(p, "too many levels of trigger recursion");
    break;
  }

  /* Register pRt is used to store the memory required to save the state
  ** of the current program, and the memory required at runtime to execute
  ** the trigger program. If this trigger has been fired before, then pRt 
  ** is already allocated. Otherwise, it must be initialized.  */
  if( (pRt->flags&MEM_Frame)==0 ){
................................................................................
  }

  p->nFrame++;
  pFrame->pParent = p->pFrame;
  pFrame->lastRowid = lastRowid;
  pFrame->nChange = p->nChange;
  pFrame->nDbChange = p->db->nChange;



  p->nChange = 0;
  p->pFrame = pFrame;
  p->aMem = aMem = &VdbeFrameMem(pFrame)[-1];
  p->nMem = pFrame->nChildMem;
  p->nCursor = (u16)pFrame->nChildCsr;
  p->apCsr = (VdbeCursor **)&aMem[p->nMem+1];
  p->aOp = aOp = pProgram->aOp;
................................................................................
  (pCtx->pFunc->xSFunc)(pCtx,pCtx->argc,pCtx->argv); /* IMP: R-24505-23230 */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(&t));
      rc = pCtx->isError;
    }
    sqlite3VdbeMemRelease(&t);

  }else{
    assert( t.flags==MEM_Null );
  }
  if( pCtx->skipFlag ){
    assert( pOp[-1].opcode==OP_CollSeq );
    i = pOp[-1].p1;
    if( i ) sqlite3VdbeMemSetInt64(&aMem[i], 1);
................................................................................
  Mem *pMem;
  assert( pOp->p1>0 && pOp->p1<=(p->nMem-p->nCursor) );
  pMem = &aMem[pOp->p1];
  assert( (pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
  rc = sqlite3VdbeMemFinalize(pMem, pOp->p4.pFunc);
  if( rc ){
    sqlite3VdbeError(p, "%s", sqlite3_value_text(pMem));

  }
  sqlite3VdbeChangeEncoding(pMem, encoding);
  UPDATE_MAX_BLOBSIZE(pMem);
  if( sqlite3VdbeMemTooBig(pMem) ){
    goto too_big;
  }
  break;
................................................................................
  aRes[1] = aRes[2] = -1;
  assert( pOp->p2==SQLITE_CHECKPOINT_PASSIVE
       || pOp->p2==SQLITE_CHECKPOINT_FULL
       || pOp->p2==SQLITE_CHECKPOINT_RESTART
       || pOp->p2==SQLITE_CHECKPOINT_TRUNCATE
  );
  rc = sqlite3Checkpoint(db, pOp->p1, pOp->p2, &aRes[1], &aRes[2]);

  if( rc==SQLITE_BUSY ){
    rc = SQLITE_OK;
    aRes[0] = 1;
  }
  for(i=0, pMem = &aMem[pOp->p3]; i<3; i++, pMem++){
    sqlite3VdbeMemSetInt64(pMem, (i64)aRes[i]);
  }    
  break;
................................................................................
  ){
    if( !db->autoCommit || db->nVdbeRead>1 ){
      rc = SQLITE_ERROR;
      sqlite3VdbeError(p,
          "cannot change %s wal mode from within a transaction",
          (eNew==PAGER_JOURNALMODE_WAL ? "into" : "out of")
      );
      break;
    }else{
 
      if( eOld==PAGER_JOURNALMODE_WAL ){
        /* If leaving WAL mode, close the log file. If successful, the call
        ** to PagerCloseWal() checkpoints and deletes the write-ahead-log 
        ** file. An EXCLUSIVE lock may still be held on the database file 
        ** after a successful return. 
................................................................................
      if( rc==SQLITE_OK ){
        rc = sqlite3BtreeSetVersion(pBt, (eNew==PAGER_JOURNALMODE_WAL ? 2 : 1));
      }
    }
  }
#endif /* ifndef SQLITE_OMIT_WAL */

  if( rc ){
    eNew = eOld;
  }
  eNew = sqlite3PagerSetJournalMode(pPager, eNew);

  pOut->flags = MEM_Str|MEM_Static|MEM_Term;
  pOut->z = (char *)sqlite3JournalModename(eNew);
  pOut->n = sqlite3Strlen30(pOut->z);
  pOut->enc = SQLITE_UTF8;
  sqlite3VdbeChangeEncoding(pOut, encoding);

  break;
};
#endif /* SQLITE_OMIT_PRAGMA */

#if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH)
/* Opcode: Vacuum * * * * *
**
................................................................................
** Vacuum the entire database.  This opcode will cause other virtual
** machines to be created and run.  It may not be called from within
** a transaction.
*/
case OP_Vacuum: {
  assert( p->readOnly==0 );
  rc = sqlite3RunVacuum(&p->zErrMsg, db);

  break;
}
#endif

#if !defined(SQLITE_OMIT_AUTOVACUUM)
/* Opcode: IncrVacuum P1 P2 * * *
**
................................................................................

  assert( pOp->p1>=0 && pOp->p1<db->nDb );
  assert( DbMaskTest(p->btreeMask, pOp->p1) );
  assert( p->readOnly==0 );
  pBt = db->aDb[pOp->p1].pBt;
  rc = sqlite3BtreeIncrVacuum(pBt);
  VdbeBranchTaken(rc==SQLITE_DONE,2);

  if( rc==SQLITE_DONE ){
    rc = SQLITE_OK;
    goto jump_to_p2;
  }
  break;
}
#endif

................................................................................
  u8 isWriteLock = (u8)pOp->p3;
  if( isWriteLock || 0==(db->flags&SQLITE_ReadUncommitted) ){
    int p1 = pOp->p1; 
    assert( p1>=0 && p1<db->nDb );
    assert( DbMaskTest(p->btreeMask, p1) );
    assert( isWriteLock==0 || isWriteLock==1 );
    rc = sqlite3BtreeLockTable(db->aDb[p1].pBt, pOp->p2, isWriteLock);

    if( (rc&0xFF)==SQLITE_LOCKED ){
      const char *z = pOp->p4.z;
      sqlite3VdbeError(p, "database table is locked: %s", z);


    }
  }
  break;
}
#endif /* SQLITE_OMIT_SHARED_CACHE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
................................................................................
** code will be set to SQLITE_LOCKED.
*/
case OP_VBegin: {
  VTable *pVTab;
  pVTab = pOp->p4.pVtab;
  rc = sqlite3VtabBegin(db, pVTab);
  if( pVTab ) sqlite3VtabImportErrmsg(p, pVTab->pVtab);

  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VCreate P1 P2 * * *
**
................................................................................
  assert( rc==SQLITE_OK );
  zTab = (const char*)sqlite3_value_text(&sMem);
  assert( zTab || db->mallocFailed );
  if( zTab ){
    rc = sqlite3VtabCallCreate(db, pOp->p1, zTab, &p->zErrMsg);
  }
  sqlite3VdbeMemRelease(&sMem);

  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VDestroy P1 * * P4 *
**
................................................................................
** P4 is the name of a virtual table in database P1.  Call the xDestroy method
** of that table.
*/
case OP_VDestroy: {
  db->nVDestroy++;
  rc = sqlite3VtabCallDestroy(db, pOp->p1, pOp->p4.z);
  db->nVDestroy--;

  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VOpen P1 * * P4 *
**
................................................................................

  assert( p->bIsReader );
  pCur = 0;
  pVCur = 0;
  pVtab = pOp->p4.pVtab->pVtab;
  if( pVtab==0 || NEVER(pVtab->pModule==0) ){
    rc = SQLITE_LOCKED;
    break;
  }
  pModule = pVtab->pModule;
  rc = pModule->xOpen(pVtab, &pVCur);
  sqlite3VtabImportErrmsg(p, pVtab);
  if( SQLITE_OK==rc ){

    /* Initialize sqlite3_vtab_cursor base class */
    pVCur->pVtab = pVtab;

    /* Initialize vdbe cursor object */
    pCur = allocateCursor(p, pOp->p1, 0, -1, CURTYPE_VTAB);
    if( pCur ){
      pCur->uc.pVCur = pVCur;
      pVtab->nRef++;
    }else{
      assert( db->mallocFailed );
      pModule->xClose(pVCur);
      goto no_mem;
    }
  }
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VFilter P1 P2 P3 P4 *
................................................................................
  res = 0;
  apArg = p->apArg;
  for(i = 0; i<nArg; i++){
    apArg[i] = &pArgc[i+1];
  }
  rc = pModule->xFilter(pVCur, iQuery, pOp->p4.z, nArg, apArg);
  sqlite3VtabImportErrmsg(p, pVtab);
  if( rc==SQLITE_OK ){
    res = pModule->xEof(pVCur);
  }
  pCur->nullRow = 0;
  VdbeBranchTaken(res!=0,2);
  if( res ) goto jump_to_p2;
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

................................................................................
  sqlite3VdbeChangeEncoding(pDest, encoding);
  REGISTER_TRACE(pOp->p3, pDest);
  UPDATE_MAX_BLOBSIZE(pDest);

  if( sqlite3VdbeMemTooBig(pDest) ){
    goto too_big;
  }

  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VNext P1 P2 * * *
**
................................................................................
  ** underlying implementation to return an error if one occurs during
  ** xNext(). Instead, if an error occurs, true is returned (indicating that 
  ** data is available) and the error code returned when xColumn or
  ** some other method is next invoked on the save virtual table cursor.
  */
  rc = pModule->xNext(pCur->uc.pVCur);
  sqlite3VtabImportErrmsg(p, pVtab);
  if( rc==SQLITE_OK ){
    res = pModule->xEof(pCur->uc.pVCur);
  }
  VdbeBranchTaken(!res,2);
  if( !res ){
    /* If there is data, jump to P2 */
    goto jump_to_p2_and_check_for_interrupt;
  }
  goto check_for_interrupt;
}
................................................................................
  assert( p->readOnly==0 );
  REGISTER_TRACE(pOp->p1, pName);
  assert( pName->flags & MEM_Str );
  testcase( pName->enc==SQLITE_UTF8 );
  testcase( pName->enc==SQLITE_UTF16BE );
  testcase( pName->enc==SQLITE_UTF16LE );
  rc = sqlite3VdbeChangeEncoding(pName, SQLITE_UTF8);
  if( rc==SQLITE_OK ){
    rc = pVtab->pModule->xRename(pVtab, pName->z);
    sqlite3VtabImportErrmsg(p, pVtab);
    p->expired = 0;
  }

  break;
}
#endif

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VUpdate P1 P2 P3 P4 P5
** Synopsis: data=r[P3@P2]
................................................................................
  assert( pOp->p2==1        || pOp->p5==OE_Fail   || pOp->p5==OE_Rollback 
       || pOp->p5==OE_Abort || pOp->p5==OE_Ignore || pOp->p5==OE_Replace
  );
  assert( p->readOnly==0 );
  pVtab = pOp->p4.pVtab->pVtab;
  if( pVtab==0 || NEVER(pVtab->pModule==0) ){
    rc = SQLITE_LOCKED;
    break;
  }
  pModule = pVtab->pModule;
  nArg = pOp->p2;
  assert( pOp->p4type==P4_VTAB );
  if( ALWAYS(pModule->xUpdate) ){
    u8 vtabOnConflict = db->vtabOnConflict;
    apArg = p->apArg;
................................................................................
        rc = SQLITE_OK;
      }else{
        p->errorAction = ((pOp->p5==OE_Replace) ? OE_Abort : pOp->p5);
      }
    }else{
      p->nChange++;
    }

  }
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef  SQLITE_OMIT_PAGER_PRAGMAS
/* Opcode: Pagecount P1 P2 * * *
................................................................................
#endif  /* SQLITE_DEBUG */
#endif  /* NDEBUG */
  }  /* The end of the for(;;) loop the loops through opcodes */

  /* If we reach this point, it means that execution is finished with
  ** an error of some kind.
  */
vdbe_error_halt:

  assert( rc );



  p->rc = rc;
  testcase( sqlite3GlobalConfig.xLog!=0 );
  sqlite3_log(rc, "statement aborts at %d: [%s] %s", 
                   (int)(pOp - aOp), p->zSql, p->zErrMsg);
  sqlite3VdbeHalt(p);
  if( rc==SQLITE_IOERR_NOMEM ) sqlite3OomFault(db);
  rc = SQLITE_ERROR;
................................................................................

  /* Jump to here if a string or blob larger than SQLITE_MAX_LENGTH
  ** is encountered.
  */
too_big:
  sqlite3VdbeError(p, "string or blob too big");
  rc = SQLITE_TOOBIG;
  goto vdbe_error_halt;

  /* Jump to here if a malloc() fails.
  */
no_mem:
  sqlite3OomFault(db);
  sqlite3VdbeError(p, "out of memory");
  rc = SQLITE_NOMEM;
  goto vdbe_error_halt;

  /* Jump to here for any other kind of fatal error.  The "rc" variable
  ** should hold the error number.
  */
abort_due_to_error:
  assert( p->zErrMsg==0 );
  if( db->mallocFailed ) rc = SQLITE_NOMEM;
  if( rc!=SQLITE_IOERR_NOMEM ){
    sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));
  }
  goto vdbe_error_halt;

  /* Jump to here if the sqlite3_interrupt() API sets the interrupt
  ** flag.
  */
abort_due_to_interrupt:
  assert( db->u1.isInterrupted );
  rc = db->mallocFailed ? SQLITE_NOMEM : SQLITE_INTERRUPT;
  p->rc = rc;
  sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));
  goto vdbe_error_halt;
}

        }
      }
    }
    if( p->db->flags & SQLITE_VdbeTrace )  printf("VDBE Trace:\n");
  }
  sqlite3EndBenignMalloc();
#endif
  for(pOp=&aOp[p->pc]; 1; pOp++){
    /* Errors are detected by individual opcodes, with an immediate
    ** jumps to abort_due_to_error. */
    assert( rc==SQLITE_OK );

    assert( pOp>=aOp && pOp<&aOp[p->nOp]);
#ifdef VDBE_PROFILE
    start = sqlite3Hwtime();
#endif
    nVmStep++;
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
    if( p->anExec ) p->anExec[(int)(pOp-aOp)]++;
................................................................................
  ** a return code SQLITE_ABORT.
  */
  if( db->xProgress!=0 && nVmStep>=nProgressLimit ){
    assert( db->nProgressOps!=0 );
    nProgressLimit = nVmStep + db->nProgressOps - (nVmStep%db->nProgressOps);
    if( db->xProgress(db->pProgressArg) ){
      rc = SQLITE_INTERRUPT;
      goto abort_due_to_error;
    }
  }
#endif
  
  break;
}

................................................................................
  pOut = out2Prerelease(p, pOp);
  pOp->opcode = OP_String;
  pOp->p1 = sqlite3Strlen30(pOp->p4.z);

#ifndef SQLITE_OMIT_UTF16
  if( encoding!=SQLITE_UTF8 ){
    rc = sqlite3VdbeMemSetStr(pOut, pOp->p4.z, -1, SQLITE_UTF8, SQLITE_STATIC);
    if( rc ){
      assert( rc==SQLITE_TOOBIG ); /* This is the only possible error here */
      goto too_big;
    }
    if( SQLITE_OK!=sqlite3VdbeChangeEncoding(pOut, encoding) ) goto no_mem;
    assert( pOut->szMalloc>0 && pOut->zMalloc==pOut->z );
    assert( VdbeMemDynamic(pOut)==0 );
    pOut->szMalloc = 0;
    pOut->flags |= MEM_Static;
    if( pOp->p4type==P4_DYNAMIC ){
      sqlite3DbFree(db, pOp->p4.z);
................................................................................
  /* Run the progress counter just before returning.
  */
  if( db->xProgress!=0
   && nVmStep>=nProgressLimit
   && db->xProgress(db->pProgressArg)!=0
  ){
    rc = SQLITE_INTERRUPT;
    goto abort_due_to_error;
  }
#endif

  /* If this statement has violated immediate foreign key constraints, do
  ** not return the number of rows modified. And do not RELEASE the statement
  ** transaction. It needs to be rolled back.  */
  if( SQLITE_OK!=(rc = sqlite3VdbeCheckFk(p, 0)) ){
    assert( db->flags&SQLITE_CountRows );
    assert( p->usesStmtJournal );
    goto abort_due_to_error;
  }

  /* If the SQLITE_CountRows flag is set in sqlite3.flags mask, then 
  ** DML statements invoke this opcode to return the number of rows 
  ** modified to the user. This is the only way that a VM that
  ** opens a statement transaction may invoke this opcode.
  **
................................................................................
  ** may lead to overlapping statement transactions.
  **
  ** The statement transaction is never a top-level transaction.  Hence
  ** the RELEASE call below can never fail.
  */
  assert( p->iStatement==0 || db->flags&SQLITE_CountRows );
  rc = sqlite3VdbeCloseStatement(p, SAVEPOINT_RELEASE);
  assert( rc==SQLITE_OK );



  /* Invalidate all ephemeral cursor row caches */
  p->cacheCtr = (p->cacheCtr + 2)|1;

  /* Make sure the results of the current row are \000 terminated
  ** and have an assigned type.  The results are de-ephemeralized as
  ** a side effect.
................................................................................

  /* If the function returned an error, throw an exception */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(pCtx->pOut));
      rc = pCtx->isError;
    }
    sqlite3VdbeDeleteAuxData(db, &p->pAuxData, pCtx->iOp, pOp->p1);
    if( rc ) goto abort_due_to_error;
  }

  /* Copy the result of the function into register P3 */
  if( pOut->flags & (MEM_Str|MEM_Blob) ){
    sqlite3VdbeChangeEncoding(pCtx->pOut, encoding);
    if( sqlite3VdbeMemTooBig(pCtx->pOut) ) goto too_big;
  }
................................................................................
  testcase( pOp->p2==SQLITE_AFF_INTEGER );
  testcase( pOp->p2==SQLITE_AFF_REAL );
  pIn1 = &aMem[pOp->p1];
  memAboutToChange(p, pIn1);
  rc = ExpandBlob(pIn1);
  sqlite3VdbeMemCast(pIn1, pOp->p2, encoding);
  UPDATE_MAX_BLOBSIZE(pIn1);
  if( rc ) goto abort_due_to_error;
  break;
}
#endif /* SQLITE_OMIT_CAST */

/* Opcode: Lt P1 P2 P3 P4 P5
** Synopsis: if r[P1]<r[P3] goto P2
**
................................................................................
      ** types use so much data space that there can only be 4096 and 32 of
      ** them, respectively.  So the maximum header length results from a
      ** 3-byte type for each of the maximum of 32768 columns plus three
      ** extra bytes for the header length itself.  32768*3 + 3 = 98307.
      */
      if( offset > 98307 || offset > pC->payloadSize ){
        rc = SQLITE_CORRUPT_BKPT;
        goto abort_due_to_error;
      }
    }

    /* The following goto is an optimization.  It can be omitted and
    ** everything will still work.  But OP_Column is measurably faster
    ** by skipping the subsequent conditional, which is always true.
    */
................................................................................
    */
    op_column_read_header:
    if( pC->iHdrOffset<aOffset[0] ){
      /* Make sure zData points to enough of the record to cover the header. */
      if( pC->aRow==0 ){
        memset(&sMem, 0, sizeof(sMem));
        rc = sqlite3VdbeMemFromBtree(pCrsr, 0, aOffset[0], !pC->isTable, &sMem);
        if( rc!=SQLITE_OK ) goto abort_due_to_error;
        zData = (u8*)sMem.z;
      }else{
        zData = pC->aRow;
      }
  
      /* Fill in pC->aType[i] and aOffset[i] values through the p2-th field. */
      i = pC->nHdrParsed;
................................................................................
      ** (2) the entire header was used but not all data was used
      ** (3) the end of the data extends beyond the end of the record.
      */
      if( (zHdr>=zEndHdr && (zHdr>zEndHdr || offset64!=pC->payloadSize))
       || (offset64 > pC->payloadSize)
      ){
        rc = SQLITE_CORRUPT_BKPT;
        goto abort_due_to_error;
      }
    }else{
      t = 0;
    }

    /* If after trying to extract new entries from the header, nHdrParsed is
    ** still not up to p2, that means that the record has fewer than p2
................................................................................
      ** So we might as well use bogus content rather than reading
      ** content from disk. */
      static u8 aZero[8];  /* This is the bogus content */
      sqlite3VdbeSerialGet(aZero, t, pDest);
    }else{
      rc = sqlite3VdbeMemFromBtree(pCrsr, aOffset[p2], len, !pC->isTable,
                                   pDest);
      if( rc!=SQLITE_OK ) goto abort_due_to_error;
      sqlite3VdbeSerialGet((const u8*)pDest->z, t, pDest);
      pDest->flags &= ~MEM_Ephem;

    }
  }

op_column_out:

  UPDATE_MAX_BLOBSIZE(pDest);
  REGISTER_TRACE(pOp->p3, pDest);
  break;
}

/* Opcode: Affinity P1 P2 * P4 *
** Synopsis: affinity(r[P1@P2])
................................................................................
  BtCursor *pCrsr;

  assert( p->apCsr[pOp->p1]->eCurType==CURTYPE_BTREE );
  pCrsr = p->apCsr[pOp->p1]->uc.pCursor;
  assert( pCrsr );
  nEntry = 0;  /* Not needed.  Only used to silence a warning. */
  rc = sqlite3BtreeCount(pCrsr, &nEntry);
  if( rc ) goto abort_due_to_error;
  pOut = out2Prerelease(p, pOp);
  pOut->u.i = nEntry;
  break;
}
#endif

/* Opcode: Savepoint P1 * * P4 *
................................................................................

      if( !isTransaction || p1==SAVEPOINT_ROLLBACK ){
        rc = sqlite3VtabSavepoint(db, p1, iSavepoint);
        if( rc!=SQLITE_OK ) goto abort_due_to_error;
      }
    }
  }
  if( rc ) goto abort_due_to_error;

  break;
}

/* Opcode: AutoCommit P1 P2 * * *
**
** Set the database auto-commit flag to P1 (1 or 0). If P2 is true, roll
................................................................................
    }else if( desiredAutoCommit && db->nVdbeWrite>0 ){
      /* If this instruction implements a COMMIT and other VMs are writing
      ** return an error indicating that the other VMs must complete first. 
      */
      sqlite3VdbeError(p, "cannot commit transaction - "
                          "SQL statements in progress");
      rc = SQLITE_BUSY;
      goto abort_due_to_error;
    }else if( (rc = sqlite3VdbeCheckFk(p, 1))!=SQLITE_OK ){
      goto vdbe_return;
    }else{
      db->autoCommit = (u8)desiredAutoCommit;
    }
    if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
      p->pc = (int)(pOp - aOp);
................................................................................
  }else{
    sqlite3VdbeError(p,
        (!desiredAutoCommit)?"cannot start a transaction within a transaction":(
        (iRollback)?"cannot rollback - no transaction is active":
                   "cannot commit - no transaction is active"));
         
    rc = SQLITE_ERROR;
    goto abort_due_to_error;
  }
  break;
}

/* Opcode: Transaction P1 P2 P3 P4 P5
**
** Begin a transaction on database P1 if a transaction is not already
................................................................................
    */
    if( db->aDb[pOp->p1].pSchema->schema_cookie!=iMeta ){
      sqlite3ResetOneSchema(db, pOp->p1);
    }
    p->expired = 1;
    rc = SQLITE_SCHEMA;
  }
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: ReadCookie P1 P2 P3 * *
**
** Read cookie number P3 from database P1 and write it into register P2.
** P3==1 is the schema version.  P3==2 is the database format.
................................................................................
  }
  if( pOp->p1==1 ){
    /* Invalidate all prepared statements whenever the TEMP database
    ** schema is changed.  Ticket #1644 */
    sqlite3ExpirePreparedStatements(db);
    p->expired = 0;
  }
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: OpenRead P1 P2 P3 P4 P5
** Synopsis: root=P2 iDb=P3
**
** Open a read-only cursor for the database table whose root page is
................................................................................
  assert( pOp->opcode==OP_OpenWrite || pOp->p5==0 || pOp->p5==OPFLAG_SEEKEQ );
  assert( p->bIsReader );
  assert( pOp->opcode==OP_OpenRead || pOp->opcode==OP_ReopenIdx
          || p->readOnly==0 );

  if( p->expired ){
    rc = SQLITE_ABORT_ROLLBACK;
    goto abort_due_to_error;
  }

  nField = 0;
  pKeyInfo = 0;
  p2 = pOp->p2;
  iDb = pOp->p3;
  assert( iDb>=0 && iDb<db->nDb );
................................................................................
    assert( (pIn2->flags & MEM_Int)!=0 );
    sqlite3VdbeMemIntegerify(pIn2);
    p2 = (int)pIn2->u.i;
    /* The p2 value always comes from a prior OP_CreateTable opcode and
    ** that opcode will always set the p2 value to 2 or more or else fail.
    ** If there were a failure, the prepared statement would have halted
    ** before reaching this instruction. */
    assert( p2>=2 );



  }
  if( pOp->p4type==P4_KEYINFO ){
    pKeyInfo = pOp->p4.pKeyInfo;
    assert( pKeyInfo->enc==ENC(db) );
    assert( pKeyInfo->db==db );
    nField = pKeyInfo->nField+pKeyInfo->nXField;
  }else if( pOp->p4type==P4_INT32 ){
................................................................................
  assert( OPFLAG_SEEKEQ==BTREE_SEEK_EQ );
  testcase( pOp->p5 & OPFLAG_BULKCSR );
#ifdef SQLITE_ENABLE_CURSOR_HINTS
  testcase( pOp->p2 & OPFLAG_SEEKEQ );
#endif
  sqlite3BtreeCursorHintFlags(pCur->uc.pCursor,
                               (pOp->p5 & (OPFLAG_BULKCSR|OPFLAG_SEEKEQ)));
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: OpenEphemeral P1 P2 * P4 P5
** Synopsis: nColumn=P2
**
** Open a new cursor P1 to a transient table.
................................................................................
      pCx->isTable = 0;
    }else{
      rc = sqlite3BtreeCursor(pCx->pBt, MASTER_ROOT, BTREE_WRCSR,
                              0, pCx->uc.pCursor);
      pCx->isTable = 1;
    }
  }
  if( rc ) goto abort_due_to_error;
  pCx->isOrdered = (pOp->p5!=BTREE_UNORDERED);
  break;
}

/* Opcode: SorterOpen P1 P2 P3 P4 *
**
** This opcode works like OP_OpenEphemeral except that it opens
................................................................................
  assert( pOp->p2>=0 );
  pCx = allocateCursor(p, pOp->p1, pOp->p2, -1, CURTYPE_SORTER);
  if( pCx==0 ) goto no_mem;
  pCx->pKeyInfo = pOp->p4.pKeyInfo;
  assert( pCx->pKeyInfo->db==db );
  assert( pCx->pKeyInfo->enc==ENC(db) );
  rc = sqlite3VdbeSorterInit(db, pOp->p3, pCx);
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: SequenceTest P1 P2 * * *
** Synopsis: if( cursor[P1].ctr++ ) pc = P2
**
** P1 is a sorter cursor. If the sequence counter is currently zero, jump
................................................................................
        break;
      }
    }
  }
  rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, pIdxKey, 0, 0, &res);
  sqlite3DbFree(db, pFree);
  if( rc!=SQLITE_OK ){
    goto abort_due_to_error;
  }
  pC->seekResult = res;
  alreadyExists = (res==0);
  pC->nullRow = 1-alreadyExists;
  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  if( pOp->opcode==OP_Found ){
................................................................................
    assert( rc==SQLITE_OK );
    if( pOp->p2==0 ){
      rc = SQLITE_CORRUPT_BKPT;
    }else{
      goto jump_to_p2;
    }
  }
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: Sequence P1 P2 * * *
** Synopsis: r[P2]=cursor[P1].ctr++
**
** Find the next available sequence number for cursor P1.
................................................................................
      do{
        sqlite3_randomness(sizeof(v), &v);
        v &= (MAX_ROWID>>1); v++;  /* Ensure that v is greater than zero */
      }while(  ((rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)v,
                                                 0, &res))==SQLITE_OK)
            && (res==0)
            && (++cnt<100));
      if( rc ) goto abort_due_to_error;
      if( res==0 ){
        rc = SQLITE_FULL;   /* IMP: R-38219-53002 */
        goto abort_due_to_error;
      }
      assert( v>0 );  /* EV: R-40812-03570 */
    }
    pC->deferredMoveto = 0;
    pC->cacheStatus = CACHE_STALE;
................................................................................
                          pData->z, pData->n, nZero,
                          (pOp->p5 & OPFLAG_APPEND)!=0, seekResult
  );
  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;

  /* Invoke the update-hook if required. */
  if( rc ) goto abort_due_to_error;
  if( db->xUpdateCallback && op && HasRowid(pTab) ){
    db->xUpdateCallback(db->pUpdateArg, op, zDb, pTab->zName, iKey);
  }
  break;
}

/* Opcode: Delete P1 P2 P3 P4 P5
**
................................................................................
      nExtraDelete--;
    }
  }
#endif

  rc = sqlite3BtreeDelete(pC->uc.pCursor, pOp->p5);
  pC->cacheStatus = CACHE_STALE;
  if( rc ) goto abort_due_to_error;

  /* Invoke the update-hook if required. */
  if( opflags & OPFLAG_NCHANGE ){
    p->nChange++;
    if( rc==SQLITE_OK && db->xUpdateCallback && HasRowid(pTab) ){
      db->xUpdateCallback(db->pUpdateArg, SQLITE_DELETE, zDb, pTab->zName,
          pC->movetoTarget);
................................................................................
  assert( isSorter(pC) );
  assert( pOp->p4type==P4_INT32 );
  pIn3 = &aMem[pOp->p3];
  nKeyCol = pOp->p4.i;
  res = 0;
  rc = sqlite3VdbeSorterCompare(pC, pIn3, nKeyCol, &res);
  VdbeBranchTaken(res!=0,2);
  if( rc ) goto abort_due_to_error;
  if( res ) goto jump_to_p2;
  break;
};

/* Opcode: SorterData P1 P2 P3 * *
** Synopsis: r[P2]=data
**
................................................................................

  pOut = &aMem[pOp->p2];
  pC = p->apCsr[pOp->p1];
  assert( isSorter(pC) );
  rc = sqlite3VdbeSorterRowkey(pC, pOut);
  assert( rc!=SQLITE_OK || (pOut->flags & MEM_Blob) );
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  if( rc ) goto abort_due_to_error;
  p->apCsr[pOp->p3]->cacheStatus = CACHE_STALE;
  break;
}

/* Opcode: RowData P1 P2 * * *
** Synopsis: r[P2]=data
**
................................................................................
  pOut->n = n;
  MemSetTypeFlag(pOut, MEM_Blob);
  if( pC->isTable==0 ){
    rc = sqlite3BtreeKey(pCrsr, 0, n, pOut->z);
  }else{
    rc = sqlite3BtreeData(pCrsr, 0, n, pOut->z);
  }
  if( rc ) goto abort_due_to_error;
  pOut->enc = SQLITE_UTF8;  /* In case the blob is ever cast to text */
  UPDATE_MAX_BLOBSIZE(pOut);
  REGISTER_TRACE(pOp->p2, pOut);
  break;
}

/* Opcode: Rowid P1 P2 * * *
................................................................................
  }else if( pC->eCurType==CURTYPE_VTAB ){
    assert( pC->uc.pVCur!=0 );
    pVtab = pC->uc.pVCur->pVtab;
    pModule = pVtab->pModule;
    assert( pModule->xRowid );
    rc = pModule->xRowid(pC->uc.pVCur, &v);
    sqlite3VtabImportErrmsg(p, pVtab);
    if( rc ) goto abort_due_to_error;
#endif /* SQLITE_OMIT_VIRTUALTABLE */
  }else{
    assert( pC->eCurType==CURTYPE_BTREE );
    assert( pC->uc.pCursor!=0 );
    rc = sqlite3VdbeCursorRestore(pC);
    if( rc ) goto abort_due_to_error;
    if( pC->nullRow ){
................................................................................
  pC->nullRow = (u8)res;
  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  pC->seekResult = pOp->p3;
#ifdef SQLITE_DEBUG
  pC->seekOp = OP_Last;
#endif
  if( rc ) goto abort_due_to_error;
  if( pOp->p2>0 ){
    VdbeBranchTaken(res!=0,2);
    if( res ) goto jump_to_p2;
  }
  break;
}

................................................................................
    assert( pC->eCurType==CURTYPE_BTREE );
    pCrsr = pC->uc.pCursor;
    assert( pCrsr );
    rc = sqlite3BtreeFirst(pCrsr, &res);
    pC->deferredMoveto = 0;
    pC->cacheStatus = CACHE_STALE;
  }
  if( rc ) goto abort_due_to_error;
  pC->nullRow = (u8)res;
  assert( pOp->p2>0 && pOp->p2<p->nOp );
  VdbeBranchTaken(res!=0,2);
  if( res ) goto jump_to_p2;
  break;
}

................................................................................
       || pC->seekOp==OP_SeekLT || pC->seekOp==OP_SeekLE
       || pC->seekOp==OP_Last );

  rc = pOp->p4.xAdvance(pC->uc.pCursor, &res);
next_tail:
  pC->cacheStatus = CACHE_STALE;
  VdbeBranchTaken(res==0,2);
  if( rc ) goto abort_due_to_error;
  if( res==0 ){
    pC->nullRow = 0;
    p->aCounter[pOp->p5]++;
#ifdef SQLITE_TEST
    sqlite3_search_count++;
#endif
    goto jump_to_p2_and_check_for_interrupt;
................................................................................
  assert( isSorter(pC)==(pOp->opcode==OP_SorterInsert) );
  pIn2 = &aMem[pOp->p2];
  assert( pIn2->flags & MEM_Blob );
  if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++;
  assert( pC->eCurType==CURTYPE_BTREE || pOp->opcode==OP_SorterInsert );
  assert( pC->isTable==0 );
  rc = ExpandBlob(pIn2);
  if( rc ) goto abort_due_to_error;
  if( pOp->opcode==OP_SorterInsert ){
    rc = sqlite3VdbeSorterWrite(pC, pIn2);
  }else{
    nKey = pIn2->n;
    zKey = pIn2->z;
    rc = sqlite3BtreeInsert(pC->uc.pCursor, zKey, nKey, "", 0, 0, pOp->p3, 
        ((pOp->p5 & OPFLAG_USESEEKRESULT) ? pC->seekResult : 0)
        );
    assert( pC->deferredMoveto==0 );
    pC->cacheStatus = CACHE_STALE;
  }

  if( rc) goto abort_due_to_error;
  break;
}

/* Opcode: IdxDelete P1 P2 P3 * *
** Synopsis: key=r[P2@P3]
**
** The content of P3 registers starting at register P2 form
................................................................................
  assert( pCrsr!=0 );
  assert( pOp->p5==0 );
  r.pKeyInfo = pC->pKeyInfo;
  r.nField = (u16)pOp->p3;
  r.default_rc = 0;
  r.aMem = &aMem[pOp->p2];
  rc = sqlite3BtreeMovetoUnpacked(pCrsr, &r, 0, 0, &res);
  if( rc ) goto abort_due_to_error;
  if( res==0 ){
    rc = sqlite3BtreeDelete(pCrsr, BTREE_AUXDELETE);
    if( rc ) goto abort_due_to_error;
  }
  assert( pC->deferredMoveto==0 );
  pC->cacheStatus = CACHE_STALE;
  break;
}

/* Opcode: Seek P1 * P3 P4 *
................................................................................
    assert( pOp->opcode==OP_IdxLE || pOp->opcode==OP_IdxLT );
    res = -res;
  }else{
    assert( pOp->opcode==OP_IdxGE || pOp->opcode==OP_IdxGT );
    res++;
  }
  VdbeBranchTaken(res>0,2);
  if( rc ) goto abort_due_to_error;
  if( res>0 ) goto jump_to_p2;
  break;
}

/* Opcode: Destroy P1 P2 P3 * *
**
** Delete an entire database table or index whose root page in the database
................................................................................
  assert( p->readOnly==0 );
  assert( pOp->p1>1 );
  pOut = out2Prerelease(p, pOp);
  pOut->flags = MEM_Null;
  if( db->nVdbeRead > db->nVDestroy+1 ){
    rc = SQLITE_LOCKED;
    p->errorAction = OE_Abort;
    goto abort_due_to_error;
  }else{
    iDb = pOp->p3;
    assert( DbMaskTest(p->btreeMask, iDb) );
    iMoved = 0;  /* Not needed.  Only to silence a warning. */
    rc = sqlite3BtreeDropTable(db->aDb[iDb].pBt, pOp->p1, &iMoved);
    pOut->flags = MEM_Int;
    pOut->u.i = iMoved;
    if( rc ) goto abort_due_to_error;
#ifndef SQLITE_OMIT_AUTOVACUUM
    if( iMoved!=0 ){
      sqlite3RootPageMoved(db, iDb, iMoved, pOp->p1);
      /* All OP_Destroy operations occur on the same btree */
      assert( resetSchemaOnFault==0 || resetSchemaOnFault==iDb+1 );
      resetSchemaOnFault = iDb+1;
    }
#endif
  }
................................................................................
    p->nChange += nChange;
    if( pOp->p3>0 ){
      assert( memIsValid(&aMem[pOp->p3]) );
      memAboutToChange(p, &aMem[pOp->p3]);
      aMem[pOp->p3].u.i += nChange;
    }
  }
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: ResetSorter P1 * * * *
**
** Delete all contents from the ephemeral table or sorter
** that is open on cursor P1.
................................................................................
  assert( pC!=0 );
  if( isSorter(pC) ){
    sqlite3VdbeSorterReset(db, pC->uc.pSorter);
  }else{
    assert( pC->eCurType==CURTYPE_BTREE );
    assert( pC->isEphemeral );
    rc = sqlite3BtreeClearTableOfCursor(pC->uc.pCursor);
    if( rc ) goto abort_due_to_error;
  }
  break;
}

/* Opcode: CreateTable P1 P2 * * *
** Synopsis: r[P2]=root iDb=P1
**
................................................................................
  if( pOp->opcode==OP_CreateTable ){
    /* flags = BTREE_INTKEY; */
    flags = BTREE_INTKEY;
  }else{
    flags = BTREE_BLOBKEY;
  }
  rc = sqlite3BtreeCreateTable(pDb->pBt, &pgno, flags);
  if( rc ) goto abort_due_to_error;
  pOut->u.i = pgno;
  break;
}

/* Opcode: ParseSchema P1 * * P4 *
**
** Read and parse all entries from the SQLITE_MASTER table of database P1
................................................................................
    initData.db = db;
    initData.iDb = pOp->p1;
    initData.pzErrMsg = &p->zErrMsg;
    zSql = sqlite3MPrintf(db,
       "SELECT name, rootpage, sql FROM '%q'.%s WHERE %s ORDER BY rowid",
       db->aDb[iDb].zName, zMaster, pOp->p4.z);
    if( zSql==0 ){
      rc = SQLITE_NOMEM_BKPT;
    }else{
      assert( db->init.busy==0 );
      db->init.busy = 1;
      initData.rc = SQLITE_OK;
      assert( !db->mallocFailed );
      rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0);
      if( rc==SQLITE_OK ) rc = initData.rc;
      sqlite3DbFree(db, zSql);
      db->init.busy = 0;
    }
  }
  if( rc ){
    sqlite3ResetAllSchemasOfConnection(db);
    if( rc==SQLITE_NOMEM ){
      goto no_mem;
    }
    goto abort_due_to_error;
  }
  break;  
}

#if !defined(SQLITE_OMIT_ANALYZE)
/* Opcode: LoadAnalysis P1 * * * *
**
................................................................................
** Read the sqlite_stat1 table for database P1 and load the content
** of that table into the internal index hash table.  This will cause
** the analysis to be used when preparing all subsequent queries.
*/
case OP_LoadAnalysis: {
  assert( pOp->p1>=0 && pOp->p1<db->nDb );
  rc = sqlite3AnalysisLoad(db, pOp->p1);
  if( rc ) goto abort_due_to_error;
  break;  
}
#endif /* !defined(SQLITE_OMIT_ANALYZE) */

/* Opcode: DropTable P1 * * P4 *
**
** Remove the internal (in-memory) data structures that describe
................................................................................
    for(pFrame=p->pFrame; pFrame && pFrame->token!=t; pFrame=pFrame->pParent);
    if( pFrame ) break;
  }

  if( p->nFrame>=db->aLimit[SQLITE_LIMIT_TRIGGER_DEPTH] ){
    rc = SQLITE_ERROR;
    sqlite3VdbeError(p, "too many levels of trigger recursion");
    goto abort_due_to_error;
  }

  /* Register pRt is used to store the memory required to save the state
  ** of the current program, and the memory required at runtime to execute
  ** the trigger program. If this trigger has been fired before, then pRt 
  ** is already allocated. Otherwise, it must be initialized.  */
  if( (pRt->flags&MEM_Frame)==0 ){
................................................................................
  }

  p->nFrame++;
  pFrame->pParent = p->pFrame;
  pFrame->lastRowid = lastRowid;
  pFrame->nChange = p->nChange;
  pFrame->nDbChange = p->db->nChange;
  assert( pFrame->pAuxData==0 );
  pFrame->pAuxData = p->pAuxData;
  p->pAuxData = 0;
  p->nChange = 0;
  p->pFrame = pFrame;
  p->aMem = aMem = &VdbeFrameMem(pFrame)[-1];
  p->nMem = pFrame->nChildMem;
  p->nCursor = (u16)pFrame->nChildCsr;
  p->apCsr = (VdbeCursor **)&aMem[p->nMem+1];
  p->aOp = aOp = pProgram->aOp;
................................................................................
  (pCtx->pFunc->xSFunc)(pCtx,pCtx->argc,pCtx->argv); /* IMP: R-24505-23230 */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(&t));
      rc = pCtx->isError;
    }
    sqlite3VdbeMemRelease(&t);
    if( rc ) goto abort_due_to_error;
  }else{
    assert( t.flags==MEM_Null );
  }
  if( pCtx->skipFlag ){
    assert( pOp[-1].opcode==OP_CollSeq );
    i = pOp[-1].p1;
    if( i ) sqlite3VdbeMemSetInt64(&aMem[i], 1);
................................................................................
  Mem *pMem;
  assert( pOp->p1>0 && pOp->p1<=(p->nMem-p->nCursor) );
  pMem = &aMem[pOp->p1];
  assert( (pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
  rc = sqlite3VdbeMemFinalize(pMem, pOp->p4.pFunc);
  if( rc ){
    sqlite3VdbeError(p, "%s", sqlite3_value_text(pMem));
    goto abort_due_to_error;
  }
  sqlite3VdbeChangeEncoding(pMem, encoding);
  UPDATE_MAX_BLOBSIZE(pMem);
  if( sqlite3VdbeMemTooBig(pMem) ){
    goto too_big;
  }
  break;
................................................................................
  aRes[1] = aRes[2] = -1;
  assert( pOp->p2==SQLITE_CHECKPOINT_PASSIVE
       || pOp->p2==SQLITE_CHECKPOINT_FULL
       || pOp->p2==SQLITE_CHECKPOINT_RESTART
       || pOp->p2==SQLITE_CHECKPOINT_TRUNCATE
  );
  rc = sqlite3Checkpoint(db, pOp->p1, pOp->p2, &aRes[1], &aRes[2]);
  if( rc ){
    if( rc!=SQLITE_BUSY ) goto abort_due_to_error;
    rc = SQLITE_OK;
    aRes[0] = 1;
  }
  for(i=0, pMem = &aMem[pOp->p3]; i<3; i++, pMem++){
    sqlite3VdbeMemSetInt64(pMem, (i64)aRes[i]);
  }    
  break;
................................................................................
  ){
    if( !db->autoCommit || db->nVdbeRead>1 ){
      rc = SQLITE_ERROR;
      sqlite3VdbeError(p,
          "cannot change %s wal mode from within a transaction",
          (eNew==PAGER_JOURNALMODE_WAL ? "into" : "out of")
      );
      goto abort_due_to_error;
    }else{
 
      if( eOld==PAGER_JOURNALMODE_WAL ){
        /* If leaving WAL mode, close the log file. If successful, the call
        ** to PagerCloseWal() checkpoints and deletes the write-ahead-log 
        ** file. An EXCLUSIVE lock may still be held on the database file 
        ** after a successful return. 
................................................................................
      if( rc==SQLITE_OK ){
        rc = sqlite3BtreeSetVersion(pBt, (eNew==PAGER_JOURNALMODE_WAL ? 2 : 1));
      }
    }
  }
#endif /* ifndef SQLITE_OMIT_WAL */


  if( rc ) eNew = eOld;

  eNew = sqlite3PagerSetJournalMode(pPager, eNew);

  pOut->flags = MEM_Str|MEM_Static|MEM_Term;
  pOut->z = (char *)sqlite3JournalModename(eNew);
  pOut->n = sqlite3Strlen30(pOut->z);
  pOut->enc = SQLITE_UTF8;
  sqlite3VdbeChangeEncoding(pOut, encoding);
  if( rc ) goto abort_due_to_error;
  break;
};
#endif /* SQLITE_OMIT_PRAGMA */

#if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH)
/* Opcode: Vacuum * * * * *
**
................................................................................
** Vacuum the entire database.  This opcode will cause other virtual
** machines to be created and run.  It may not be called from within
** a transaction.
*/
case OP_Vacuum: {
  assert( p->readOnly==0 );
  rc = sqlite3RunVacuum(&p->zErrMsg, db);
  if( rc ) goto abort_due_to_error;
  break;
}
#endif

#if !defined(SQLITE_OMIT_AUTOVACUUM)
/* Opcode: IncrVacuum P1 P2 * * *
**
................................................................................

  assert( pOp->p1>=0 && pOp->p1<db->nDb );
  assert( DbMaskTest(p->btreeMask, pOp->p1) );
  assert( p->readOnly==0 );
  pBt = db->aDb[pOp->p1].pBt;
  rc = sqlite3BtreeIncrVacuum(pBt);
  VdbeBranchTaken(rc==SQLITE_DONE,2);
  if( rc ){
    if( rc!=SQLITE_DONE ) goto abort_due_to_error;
    rc = SQLITE_OK;
    goto jump_to_p2;
  }
  break;
}
#endif

................................................................................
  u8 isWriteLock = (u8)pOp->p3;
  if( isWriteLock || 0==(db->flags&SQLITE_ReadUncommitted) ){
    int p1 = pOp->p1; 
    assert( p1>=0 && p1<db->nDb );
    assert( DbMaskTest(p->btreeMask, p1) );
    assert( isWriteLock==0 || isWriteLock==1 );
    rc = sqlite3BtreeLockTable(db->aDb[p1].pBt, pOp->p2, isWriteLock);
    if( rc ){
      if( (rc&0xFF)==SQLITE_LOCKED ){
        const char *z = pOp->p4.z;
        sqlite3VdbeError(p, "database table is locked: %s", z);
      }
      goto abort_due_to_error;
    }
  }
  break;
}
#endif /* SQLITE_OMIT_SHARED_CACHE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
................................................................................
** code will be set to SQLITE_LOCKED.
*/
case OP_VBegin: {
  VTable *pVTab;
  pVTab = pOp->p4.pVtab;
  rc = sqlite3VtabBegin(db, pVTab);
  if( pVTab ) sqlite3VtabImportErrmsg(p, pVTab->pVtab);
  if( rc ) goto abort_due_to_error;
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VCreate P1 P2 * * *
**
................................................................................
  assert( rc==SQLITE_OK );
  zTab = (const char*)sqlite3_value_text(&sMem);
  assert( zTab || db->mallocFailed );
  if( zTab ){
    rc = sqlite3VtabCallCreate(db, pOp->p1, zTab, &p->zErrMsg);
  }
  sqlite3VdbeMemRelease(&sMem);
  if( rc ) goto abort_due_to_error;
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VDestroy P1 * * P4 *
**
................................................................................
** P4 is the name of a virtual table in database P1.  Call the xDestroy method
** of that table.
*/
case OP_VDestroy: {
  db->nVDestroy++;
  rc = sqlite3VtabCallDestroy(db, pOp->p1, pOp->p4.z);
  db->nVDestroy--;
  if( rc ) goto abort_due_to_error;
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VOpen P1 * * P4 *
**
................................................................................

  assert( p->bIsReader );
  pCur = 0;
  pVCur = 0;
  pVtab = pOp->p4.pVtab->pVtab;
  if( pVtab==0 || NEVER(pVtab->pModule==0) ){
    rc = SQLITE_LOCKED;
    goto abort_due_to_error;
  }
  pModule = pVtab->pModule;
  rc = pModule->xOpen(pVtab, &pVCur);
  sqlite3VtabImportErrmsg(p, pVtab);
  if( rc ) goto abort_due_to_error;

  /* Initialize sqlite3_vtab_cursor base class */
  pVCur->pVtab = pVtab;

  /* Initialize vdbe cursor object */
  pCur = allocateCursor(p, pOp->p1, 0, -1, CURTYPE_VTAB);
  if( pCur ){
    pCur->uc.pVCur = pVCur;
    pVtab->nRef++;
  }else{
    assert( db->mallocFailed );
    pModule->xClose(pVCur);
    goto no_mem;

  }
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VFilter P1 P2 P3 P4 *
................................................................................
  res = 0;
  apArg = p->apArg;
  for(i = 0; i<nArg; i++){
    apArg[i] = &pArgc[i+1];
  }
  rc = pModule->xFilter(pVCur, iQuery, pOp->p4.z, nArg, apArg);
  sqlite3VtabImportErrmsg(p, pVtab);
  if( rc ) goto abort_due_to_error;
  res = pModule->xEof(pVCur);

  pCur->nullRow = 0;
  VdbeBranchTaken(res!=0,2);
  if( res ) goto jump_to_p2;
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

................................................................................
  sqlite3VdbeChangeEncoding(pDest, encoding);
  REGISTER_TRACE(pOp->p3, pDest);
  UPDATE_MAX_BLOBSIZE(pDest);

  if( sqlite3VdbeMemTooBig(pDest) ){
    goto too_big;
  }
  if( rc ) goto abort_due_to_error;
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VNext P1 P2 * * *
**
................................................................................
  ** underlying implementation to return an error if one occurs during
  ** xNext(). Instead, if an error occurs, true is returned (indicating that 
  ** data is available) and the error code returned when xColumn or
  ** some other method is next invoked on the save virtual table cursor.
  */
  rc = pModule->xNext(pCur->uc.pVCur);
  sqlite3VtabImportErrmsg(p, pVtab);
  if( rc ) goto abort_due_to_error;
  res = pModule->xEof(pCur->uc.pVCur);

  VdbeBranchTaken(!res,2);
  if( !res ){
    /* If there is data, jump to P2 */
    goto jump_to_p2_and_check_for_interrupt;
  }
  goto check_for_interrupt;
}
................................................................................
  assert( p->readOnly==0 );
  REGISTER_TRACE(pOp->p1, pName);
  assert( pName->flags & MEM_Str );
  testcase( pName->enc==SQLITE_UTF8 );
  testcase( pName->enc==SQLITE_UTF16BE );
  testcase( pName->enc==SQLITE_UTF16LE );
  rc = sqlite3VdbeChangeEncoding(pName, SQLITE_UTF8);
  if( rc ) goto abort_due_to_error;
  rc = pVtab->pModule->xRename(pVtab, pName->z);
  sqlite3VtabImportErrmsg(p, pVtab);
  p->expired = 0;

  if( rc ) goto abort_due_to_error;
  break;
}
#endif

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Opcode: VUpdate P1 P2 P3 P4 P5
** Synopsis: data=r[P3@P2]
................................................................................
  assert( pOp->p2==1        || pOp->p5==OE_Fail   || pOp->p5==OE_Rollback 
       || pOp->p5==OE_Abort || pOp->p5==OE_Ignore || pOp->p5==OE_Replace
  );
  assert( p->readOnly==0 );
  pVtab = pOp->p4.pVtab->pVtab;
  if( pVtab==0 || NEVER(pVtab->pModule==0) ){
    rc = SQLITE_LOCKED;
    goto abort_due_to_error;
  }
  pModule = pVtab->pModule;
  nArg = pOp->p2;
  assert( pOp->p4type==P4_VTAB );
  if( ALWAYS(pModule->xUpdate) ){
    u8 vtabOnConflict = db->vtabOnConflict;
    apArg = p->apArg;
................................................................................
        rc = SQLITE_OK;
      }else{
        p->errorAction = ((pOp->p5==OE_Replace) ? OE_Abort : pOp->p5);
      }
    }else{
      p->nChange++;
    }
    if( rc ) goto abort_due_to_error;
  }
  break;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifndef  SQLITE_OMIT_PAGER_PRAGMAS
/* Opcode: Pagecount P1 P2 * * *
................................................................................
#endif  /* SQLITE_DEBUG */
#endif  /* NDEBUG */
  }  /* The end of the for(;;) loop the loops through opcodes */

  /* If we reach this point, it means that execution is finished with
  ** an error of some kind.
  */
abort_due_to_error:
  if( db->mallocFailed ) rc = SQLITE_NOMEM_BKPT;
  assert( rc );
  if( p->zErrMsg==0 && rc!=SQLITE_IOERR_NOMEM ){
    sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));
  }
  p->rc = rc;
  testcase( sqlite3GlobalConfig.xLog!=0 );
  sqlite3_log(rc, "statement aborts at %d: [%s] %s", 
                   (int)(pOp - aOp), p->zSql, p->zErrMsg);
  sqlite3VdbeHalt(p);
  if( rc==SQLITE_IOERR_NOMEM ) sqlite3OomFault(db);
  rc = SQLITE_ERROR;
................................................................................

  /* Jump to here if a string or blob larger than SQLITE_MAX_LENGTH
  ** is encountered.
  */
too_big:
  sqlite3VdbeError(p, "string or blob too big");
  rc = SQLITE_TOOBIG;
  goto abort_due_to_error;

  /* Jump to here if a malloc() fails.
  */
no_mem:
  sqlite3OomFault(db);
  sqlite3VdbeError(p, "out of memory");
  rc = SQLITE_NOMEM_BKPT;





  goto abort_due_to_error;







  /* Jump to here if the sqlite3_interrupt() API sets the interrupt
  ** flag.
  */
abort_due_to_interrupt:
  assert( db->u1.isInterrupted );
  rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_INTERRUPT;
  p->rc = rc;
  sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));
  goto abort_due_to_error;
}

  Op *aOp;                /* Program instructions for parent frame */
  i64 *anExec;            /* Event counters from parent frame */
  Mem *aMem;              /* Array of memory cells for parent frame */
  u8 *aOnceFlag;          /* Array of OP_Once flags for parent frame */
  VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
  void *token;            /* Copy of SubProgram.token */
  i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */

  int nCursor;            /* Number of entries in apCsr */
  int pc;                 /* Program Counter in parent (calling) frame */
  int nOp;                /* Size of aOp array */
  int nMem;               /* Number of entries in aMem */
  int nOnceFlag;          /* Number of entries in aOnceFlag */
  int nChildMem;          /* Number of memory cells for child frame */
  int nChildCsr;          /* Number of cursors for child frame */
................................................................................
void sqlite3VdbePrintOp(FILE*, int, Op*);
#endif
u32 sqlite3VdbeSerialTypeLen(u32);
u8 sqlite3VdbeOneByteSerialTypeLen(u8);
u32 sqlite3VdbeSerialType(Mem*, int, u32*);
u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
void sqlite3VdbeDeleteAuxData(Vdbe*, int, int);

int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
int sqlite3VdbeExec(Vdbe*);
int sqlite3VdbeList(Vdbe*);
int sqlite3VdbeHalt(Vdbe*);

  Op *aOp;                /* Program instructions for parent frame */
  i64 *anExec;            /* Event counters from parent frame */
  Mem *aMem;              /* Array of memory cells for parent frame */
  u8 *aOnceFlag;          /* Array of OP_Once flags for parent frame */
  VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
  void *token;            /* Copy of SubProgram.token */
  i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
  AuxData *pAuxData;      /* Linked list of auxdata allocations */
  int nCursor;            /* Number of entries in apCsr */
  int pc;                 /* Program Counter in parent (calling) frame */
  int nOp;                /* Size of aOp array */
  int nMem;               /* Number of entries in aMem */
  int nOnceFlag;          /* Number of entries in aOnceFlag */
  int nChildMem;          /* Number of memory cells for child frame */
  int nChildCsr;          /* Number of cursors for child frame */
................................................................................
void sqlite3VdbePrintOp(FILE*, int, Op*);
#endif
u32 sqlite3VdbeSerialTypeLen(u32);
u8 sqlite3VdbeOneByteSerialTypeLen(u8);
u32 sqlite3VdbeSerialType(Mem*, int, u32*);
u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
void sqlite3VdbeDeleteAuxData(sqlite3*, AuxData**, int, int);

int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
int sqlite3VdbeExec(Vdbe*);
int sqlite3VdbeList(Vdbe*);
int sqlite3VdbeHalt(Vdbe*);

                       SQLITE_UTF8, SQLITE_STATIC);
}

/* An SQLITE_NOMEM error. */
void sqlite3_result_error_nomem(sqlite3_context *pCtx){
  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
  sqlite3VdbeMemSetNull(pCtx->pOut);
  pCtx->isError = SQLITE_NOMEM;
  pCtx->fErrorOrAux = 1;
  sqlite3OomFault(pCtx->pOut->db);
}

/*
** This function is called after a transaction has been committed. It 
** invokes callbacks registered with sqlite3_wal_hook() as required.
................................................................................
#endif
  }

  /* Check that malloc() has not failed. If it has, return early. */
  db = p->db;
  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM;
    return SQLITE_NOMEM;
  }

  if( p->pc<=0 && p->expired ){
    p->rc = SQLITE_SCHEMA;
    rc = SQLITE_ERROR;
    goto end_of_step;
  }
................................................................................
    if( p->rc!=SQLITE_OK ){
      rc = SQLITE_ERROR;
    }
  }

  db->errCode = rc;
  if( SQLITE_NOMEM==sqlite3ApiExit(p->db, p->rc) ){
    p->rc = SQLITE_NOMEM;
  }
end_of_step:
  /* At this point local variable rc holds the value that should be 
  ** returned if this statement was compiled using the legacy 
  ** sqlite3_prepare() interface. According to the docs, this can only
  ** be one of the values in the first assert() below. Variable p->rc 
  ** contains the value that would be returned if sqlite3_finalize() 
................................................................................
    const char *zErr = (const char *)sqlite3_value_text(db->pErr); 
    sqlite3DbFree(db, v->zErrMsg);
    if( !db->mallocFailed ){
      v->zErrMsg = sqlite3DbStrDup(db, zErr);
      v->rc = rc2;
    } else {
      v->zErrMsg = 0;
      v->rc = rc = SQLITE_NOMEM;
    }
  }
  rc = sqlite3ApiExit(db, rc);
  sqlite3_mutex_leave(db->mutex);
  return rc;
}

................................................................................
int sqlite3_bind_blob(
  sqlite3_stmt *pStmt, 
  int i, 
  const void *zData, 
  int nData, 
  void (*xDel)(void*)
){



  return bindText(pStmt, i, zData, nData, xDel, 0);
}
int sqlite3_bind_blob64(
  sqlite3_stmt *pStmt, 
  int i, 
  const void *zData, 
  sqlite3_uint64 nData, 

                       SQLITE_UTF8, SQLITE_STATIC);
}

/* An SQLITE_NOMEM error. */
void sqlite3_result_error_nomem(sqlite3_context *pCtx){
  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
  sqlite3VdbeMemSetNull(pCtx->pOut);
  pCtx->isError = SQLITE_NOMEM_BKPT;
  pCtx->fErrorOrAux = 1;
  sqlite3OomFault(pCtx->pOut->db);
}

/*
** This function is called after a transaction has been committed. It 
** invokes callbacks registered with sqlite3_wal_hook() as required.
................................................................................
#endif
  }

  /* Check that malloc() has not failed. If it has, return early. */
  db = p->db;
  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM;
    return SQLITE_NOMEM_BKPT;
  }

  if( p->pc<=0 && p->expired ){
    p->rc = SQLITE_SCHEMA;
    rc = SQLITE_ERROR;
    goto end_of_step;
  }
................................................................................
    if( p->rc!=SQLITE_OK ){
      rc = SQLITE_ERROR;
    }
  }

  db->errCode = rc;
  if( SQLITE_NOMEM==sqlite3ApiExit(p->db, p->rc) ){
    p->rc = SQLITE_NOMEM_BKPT;
  }
end_of_step:
  /* At this point local variable rc holds the value that should be 
  ** returned if this statement was compiled using the legacy 
  ** sqlite3_prepare() interface. According to the docs, this can only
  ** be one of the values in the first assert() below. Variable p->rc 
  ** contains the value that would be returned if sqlite3_finalize() 
................................................................................
    const char *zErr = (const char *)sqlite3_value_text(db->pErr); 
    sqlite3DbFree(db, v->zErrMsg);
    if( !db->mallocFailed ){
      v->zErrMsg = sqlite3DbStrDup(db, zErr);
      v->rc = rc2;
    } else {
      v->zErrMsg = 0;
      v->rc = rc = SQLITE_NOMEM_BKPT;
    }
  }
  rc = sqlite3ApiExit(db, rc);
  sqlite3_mutex_leave(db->mutex);
  return rc;
}

................................................................................
int sqlite3_bind_blob(
  sqlite3_stmt *pStmt, 
  int i, 
  const void *zData, 
  int nData, 
  void (*xDel)(void*)
){
#ifdef SQLITE_ENABLE_API_ARMOR
  if( nData<0 ) return SQLITE_MISUSE_BKPT;
#endif
  return bindText(pStmt, i, zData, nData, xDel, 0);
}
int sqlite3_bind_blob64(
  sqlite3_stmt *pStmt, 
  int i, 
  const void *zData, 
  sqlite3_uint64 nData, 

  assert( nNew>=(p->nOpAlloc+nOp) );
  pNew = sqlite3DbRealloc(p->db, v->aOp, nNew*sizeof(Op));
  if( pNew ){
    p->szOpAlloc = sqlite3DbMallocSize(p->db, pNew);
    p->nOpAlloc = p->szOpAlloc/sizeof(Op);
    v->aOp = pNew;
  }
  return (pNew ? SQLITE_OK : SQLITE_NOMEM);
}

#ifdef SQLITE_DEBUG
/* This routine is just a convenient place to set a breakpoint that will
** fire after each opcode is inserted and displayed using
** "PRAGMA vdbe_addoptrace=on".
*/
................................................................................
  int i;
  Mem *aMem = VdbeFrameMem(p);
  VdbeCursor **apCsr = (VdbeCursor **)&aMem[p->nChildMem];
  for(i=0; i<p->nChildCsr; i++){
    sqlite3VdbeFreeCursor(p->v, apCsr[i]);
  }
  releaseMemArray(aMem, p->nChildMem);

  sqlite3DbFree(p->v->db, p);
}

#ifndef SQLITE_OMIT_EXPLAIN
/*
** Give a listing of the program in the virtual machine.
**
................................................................................
  /* Even though this opcode does not use dynamic strings for
  ** the result, result columns may become dynamic if the user calls
  ** sqlite3_column_text16(), causing a translation to UTF-16 encoding.
  */
  releaseMemArray(pMem, 8);
  p->pResultSet = 0;

  if( p->rc==SQLITE_NOMEM ){
    /* This happens if a malloc() inside a call to sqlite3_column_text() or
    ** sqlite3_column_text16() failed.  */
    sqlite3OomFault(db);
    return SQLITE_ERROR;
  }

  /* When the number of output rows reaches nRow, that means the
................................................................................
  v->aMem = pFrame->aMem;
  v->nMem = pFrame->nMem;
  v->apCsr = pFrame->apCsr;
  v->nCursor = pFrame->nCursor;
  v->db->lastRowid = pFrame->lastRowid;
  v->nChange = pFrame->nChange;
  v->db->nChange = pFrame->nDbChange;



  return pFrame->pc;
}

/*
** Close all cursors.
**
** Also release any dynamic memory held by the VM in the Vdbe.aMem memory 
................................................................................
  while( p->pDelFrame ){
    VdbeFrame *pDel = p->pDelFrame;
    p->pDelFrame = pDel->pParent;
    sqlite3VdbeFrameDelete(pDel);
  }

  /* Delete any auxdata allocations made by the VM */
  if( p->pAuxData ) sqlite3VdbeDeleteAuxData(p, -1, 0);
  assert( p->pAuxData==0 );
}

/*
** Clean up the VM after a single run.
*/
static void Cleanup(Vdbe *p){
................................................................................
){
  int rc;
  Mem *pColName;
  assert( idx<p->nResColumn );
  assert( var<COLNAME_N );
  if( p->db->mallocFailed ){
    assert( !zName || xDel!=SQLITE_DYNAMIC );
    return SQLITE_NOMEM;
  }
  assert( p->aColName!=0 );
  pColName = &(p->aColName[idx+var*p->nResColumn]);
  rc = sqlite3VdbeMemSetStr(pColName, zName, -1, SQLITE_UTF8, xDel);
  assert( rc!=0 || !zName || (pColName->flags&MEM_Term)!=0 );
  return rc;
}
................................................................................
** A read or write transaction may or may not be active on database handle
** db. If a transaction is active, commit it. If there is a
** write-transaction spanning more than one database file, this routine
** takes care of the master journal trickery.
*/
static int vdbeCommit(sqlite3 *db, Vdbe *p){
  int i;
  int nTrans = 0;  /* Number of databases with an active write-transaction */


  int rc = SQLITE_OK;
  int needXcommit = 0;

#ifdef SQLITE_OMIT_VIRTUALTABLE
  /* With this option, sqlite3VtabSync() is defined to be simply 
  ** SQLITE_OK so p is not used. 
  */
................................................................................
  ** including the temp database. (b) is important because if more than 
  ** one database file has an open write transaction, a master journal
  ** file is required for an atomic commit.
  */ 
  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){ 
    Btree *pBt = db->aDb[i].pBt;
    if( sqlite3BtreeIsInTrans(pBt) ){












      needXcommit = 1;
      if( i!=1 ) nTrans++;
      sqlite3BtreeEnter(pBt);







      rc = sqlite3PagerExclusiveLock(sqlite3BtreePager(pBt));
      sqlite3BtreeLeave(pBt);
    }
  }
  if( rc!=SQLITE_OK ){
    return rc;
  }

................................................................................
  /* The complex case - There is a multi-file write-transaction active.
  ** This requires a master journal file to ensure the transaction is
  ** committed atomically.
  */
#ifndef SQLITE_OMIT_DISKIO
  else{
    sqlite3_vfs *pVfs = db->pVfs;
    int needSync = 0;
    char *zMaster = 0;   /* File-name for the master journal */
    char const *zMainFile = sqlite3BtreeGetFilename(db->aDb[0].pBt);
    sqlite3_file *pMaster = 0;
    i64 offset = 0;
    int res;
    int retryCount = 0;
    int nMainFile;

    /* Select a master journal file name */
    nMainFile = sqlite3Strlen30(zMainFile);
    zMaster = sqlite3MPrintf(db, "%s-mjXXXXXX9XXz", zMainFile);
    if( zMaster==0 ) return SQLITE_NOMEM;
    do {
      u32 iRandom;
      if( retryCount ){
        if( retryCount>100 ){
          sqlite3_log(SQLITE_FULL, "MJ delete: %s", zMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          break;
................................................................................
      Btree *pBt = db->aDb[i].pBt;
      if( sqlite3BtreeIsInTrans(pBt) ){
        char const *zFile = sqlite3BtreeGetJournalname(pBt);
        if( zFile==0 ){
          continue;  /* Ignore TEMP and :memory: databases */
        }
        assert( zFile[0]!=0 );
        if( !needSync && !sqlite3BtreeSyncDisabled(pBt) ){
          needSync = 1;
        }
        rc = sqlite3OsWrite(pMaster, zFile, sqlite3Strlen30(zFile)+1, offset);
        offset += sqlite3Strlen30(zFile)+1;
        if( rc!=SQLITE_OK ){
          sqlite3OsCloseFree(pMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          sqlite3DbFree(db, zMaster);
          return rc;
................................................................................
        }
      }
    }

    /* Sync the master journal file. If the IOCAP_SEQUENTIAL device
    ** flag is set this is not required.
    */
    if( needSync 
     && 0==(sqlite3OsDeviceCharacteristics(pMaster)&SQLITE_IOCAP_SEQUENTIAL)
     && SQLITE_OK!=(rc = sqlite3OsSync(pMaster, SQLITE_SYNC_NORMAL))
    ){
      sqlite3OsCloseFree(pMaster);
      sqlite3OsDelete(pVfs, zMaster, 0);
      sqlite3DbFree(db, zMaster);
      return rc;
    }
................................................................................
      return rc;
    }

    /* Delete the master journal file. This commits the transaction. After
    ** doing this the directory is synced again before any individual
    ** transaction files are deleted.
    */
    rc = sqlite3OsDelete(pVfs, zMaster, needSync);
    sqlite3DbFree(db, zMaster);
    zMaster = 0;
    if( rc ){
      return rc;
    }

    /* All files and directories have already been synced, so the following
................................................................................
  **
  ** Then the internal cache might have been left in an inconsistent
  ** state.  We need to rollback the statement transaction, if there is
  ** one, or the complete transaction if there is no statement transaction.
  */

  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM;
  }
  if( p->aOnceFlag ) memset(p->aOnceFlag, 0, p->nOnceFlag);
  closeAllCursors(p);
  if( p->magic!=VDBE_MAGIC_RUN ){
    return SQLITE_OK;
  }
  checkActiveVdbeCnt(db);
................................................................................
    assert( db->nVdbeActive>=db->nVdbeRead );
    assert( db->nVdbeRead>=db->nVdbeWrite );
    assert( db->nVdbeWrite>=0 );
  }
  p->magic = VDBE_MAGIC_HALT;
  checkActiveVdbeCnt(db);
  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM;
  }

  /* If the auto-commit flag is set to true, then any locks that were held
  ** by connection db have now been released. Call sqlite3ConnectionUnlocked() 
  ** to invoke any required unlock-notify callbacks.
  */
  if( db->autoCommit ){
................................................................................
**
**    * the associated function parameter is the 32nd or later (counting
**      from left to right), or
**
**    * the corresponding bit in argument mask is clear (where the first
**      function parameter corresponds to bit 0 etc.).
*/
void sqlite3VdbeDeleteAuxData(Vdbe *pVdbe, int iOp, int mask){
  AuxData **pp = &pVdbe->pAuxData;
  while( *pp ){
    AuxData *pAux = *pp;
    if( (iOp<0)
     || (pAux->iOp==iOp && (pAux->iArg>31 || !(mask & MASKBIT32(pAux->iArg))))
    ){
      testcase( pAux->iArg==31 );
      if( pAux->xDelete ){
        pAux->xDelete(pAux->pAux);
      }
      *pp = pAux->pNext;
      sqlite3DbFree(pVdbe->db, pAux);
    }else{
      pp= &pAux->pNext;
    }
  }
}

/*
................................................................................
    sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
    sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
    v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
    n1 = v1==0 ? 0 : c1.n;
    v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
    n2 = v2==0 ? 0 : c2.n;
    rc = pColl->xCmp(pColl->pUser, n1, v1, n2, v2);
    if( (v1==0 || v2==0) && prcErr ) *prcErr = SQLITE_NOMEM;
    sqlite3VdbeMemRelease(&c1);
    sqlite3VdbeMemRelease(&c2);
    return rc;
  }
}

/*

  assert( nNew>=(p->nOpAlloc+nOp) );
  pNew = sqlite3DbRealloc(p->db, v->aOp, nNew*sizeof(Op));
  if( pNew ){
    p->szOpAlloc = sqlite3DbMallocSize(p->db, pNew);
    p->nOpAlloc = p->szOpAlloc/sizeof(Op);
    v->aOp = pNew;
  }
  return (pNew ? SQLITE_OK : SQLITE_NOMEM_BKPT);
}

#ifdef SQLITE_DEBUG
/* This routine is just a convenient place to set a breakpoint that will
** fire after each opcode is inserted and displayed using
** "PRAGMA vdbe_addoptrace=on".
*/
................................................................................
  int i;
  Mem *aMem = VdbeFrameMem(p);
  VdbeCursor **apCsr = (VdbeCursor **)&aMem[p->nChildMem];
  for(i=0; i<p->nChildCsr; i++){
    sqlite3VdbeFreeCursor(p->v, apCsr[i]);
  }
  releaseMemArray(aMem, p->nChildMem);
  sqlite3VdbeDeleteAuxData(p->v->db, &p->pAuxData, -1, 0);
  sqlite3DbFree(p->v->db, p);
}

#ifndef SQLITE_OMIT_EXPLAIN
/*
** Give a listing of the program in the virtual machine.
**
................................................................................
  /* Even though this opcode does not use dynamic strings for
  ** the result, result columns may become dynamic if the user calls
  ** sqlite3_column_text16(), causing a translation to UTF-16 encoding.
  */
  releaseMemArray(pMem, 8);
  p->pResultSet = 0;

  if( p->rc==SQLITE_NOMEM_BKPT ){
    /* This happens if a malloc() inside a call to sqlite3_column_text() or
    ** sqlite3_column_text16() failed.  */
    sqlite3OomFault(db);
    return SQLITE_ERROR;
  }

  /* When the number of output rows reaches nRow, that means the
................................................................................
  v->aMem = pFrame->aMem;
  v->nMem = pFrame->nMem;
  v->apCsr = pFrame->apCsr;
  v->nCursor = pFrame->nCursor;
  v->db->lastRowid = pFrame->lastRowid;
  v->nChange = pFrame->nChange;
  v->db->nChange = pFrame->nDbChange;
  sqlite3VdbeDeleteAuxData(v->db, &v->pAuxData, -1, 0);
  v->pAuxData = pFrame->pAuxData;
  pFrame->pAuxData = 0;
  return pFrame->pc;
}

/*
** Close all cursors.
**
** Also release any dynamic memory held by the VM in the Vdbe.aMem memory 
................................................................................
  while( p->pDelFrame ){
    VdbeFrame *pDel = p->pDelFrame;
    p->pDelFrame = pDel->pParent;
    sqlite3VdbeFrameDelete(pDel);
  }

  /* Delete any auxdata allocations made by the VM */
  if( p->pAuxData ) sqlite3VdbeDeleteAuxData(p->db, &p->pAuxData, -1, 0);
  assert( p->pAuxData==0 );
}

/*
** Clean up the VM after a single run.
*/
static void Cleanup(Vdbe *p){
................................................................................
){
  int rc;
  Mem *pColName;
  assert( idx<p->nResColumn );
  assert( var<COLNAME_N );
  if( p->db->mallocFailed ){
    assert( !zName || xDel!=SQLITE_DYNAMIC );
    return SQLITE_NOMEM_BKPT;
  }
  assert( p->aColName!=0 );
  pColName = &(p->aColName[idx+var*p->nResColumn]);
  rc = sqlite3VdbeMemSetStr(pColName, zName, -1, SQLITE_UTF8, xDel);
  assert( rc!=0 || !zName || (pColName->flags&MEM_Term)!=0 );
  return rc;
}
................................................................................
** A read or write transaction may or may not be active on database handle
** db. If a transaction is active, commit it. If there is a
** write-transaction spanning more than one database file, this routine
** takes care of the master journal trickery.
*/
static int vdbeCommit(sqlite3 *db, Vdbe *p){
  int i;
  int nTrans = 0;  /* Number of databases with an active write-transaction
                   ** that are candidates for a two-phase commit using a
                   ** master-journal */
  int rc = SQLITE_OK;
  int needXcommit = 0;

#ifdef SQLITE_OMIT_VIRTUALTABLE
  /* With this option, sqlite3VtabSync() is defined to be simply 
  ** SQLITE_OK so p is not used. 
  */
................................................................................
  ** including the temp database. (b) is important because if more than 
  ** one database file has an open write transaction, a master journal
  ** file is required for an atomic commit.
  */ 
  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){ 
    Btree *pBt = db->aDb[i].pBt;
    if( sqlite3BtreeIsInTrans(pBt) ){
      /* Whether or not a database might need a master journal depends upon
      ** its journal mode (among other things).  This matrix determines which
      ** journal modes use a master journal and which do not */
      static const u8 aMJNeeded[] = {
        /* DELETE   */  1,
        /* PERSIST   */ 1,
        /* OFF       */ 0,
        /* TRUNCATE  */ 1,
        /* MEMORY    */ 0,
        /* WAL       */ 0
      };
      Pager *pPager;   /* Pager associated with pBt */
      needXcommit = 1;

      sqlite3BtreeEnter(pBt);
      pPager = sqlite3BtreePager(pBt);
      if( db->aDb[i].safety_level!=PAGER_SYNCHRONOUS_OFF
       && aMJNeeded[sqlite3PagerGetJournalMode(pPager)]
      ){ 
        assert( i!=1 );
        nTrans++;
      }
      rc = sqlite3PagerExclusiveLock(pPager);
      sqlite3BtreeLeave(pBt);
    }
  }
  if( rc!=SQLITE_OK ){
    return rc;
  }

................................................................................
  /* The complex case - There is a multi-file write-transaction active.
  ** This requires a master journal file to ensure the transaction is
  ** committed atomically.
  */
#ifndef SQLITE_OMIT_DISKIO
  else{
    sqlite3_vfs *pVfs = db->pVfs;

    char *zMaster = 0;   /* File-name for the master journal */
    char const *zMainFile = sqlite3BtreeGetFilename(db->aDb[0].pBt);
    sqlite3_file *pMaster = 0;
    i64 offset = 0;
    int res;
    int retryCount = 0;
    int nMainFile;

    /* Select a master journal file name */
    nMainFile = sqlite3Strlen30(zMainFile);
    zMaster = sqlite3MPrintf(db, "%s-mjXXXXXX9XXz", zMainFile);
    if( zMaster==0 ) return SQLITE_NOMEM_BKPT;
    do {
      u32 iRandom;
      if( retryCount ){
        if( retryCount>100 ){
          sqlite3_log(SQLITE_FULL, "MJ delete: %s", zMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          break;
................................................................................
      Btree *pBt = db->aDb[i].pBt;
      if( sqlite3BtreeIsInTrans(pBt) ){
        char const *zFile = sqlite3BtreeGetJournalname(pBt);
        if( zFile==0 ){
          continue;  /* Ignore TEMP and :memory: databases */
        }
        assert( zFile[0]!=0 );



        rc = sqlite3OsWrite(pMaster, zFile, sqlite3Strlen30(zFile)+1, offset);
        offset += sqlite3Strlen30(zFile)+1;
        if( rc!=SQLITE_OK ){
          sqlite3OsCloseFree(pMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          sqlite3DbFree(db, zMaster);
          return rc;
................................................................................
        }
      }
    }

    /* Sync the master journal file. If the IOCAP_SEQUENTIAL device
    ** flag is set this is not required.
    */

    if( 0==(sqlite3OsDeviceCharacteristics(pMaster)&SQLITE_IOCAP_SEQUENTIAL)
     && SQLITE_OK!=(rc = sqlite3OsSync(pMaster, SQLITE_SYNC_NORMAL))
    ){
      sqlite3OsCloseFree(pMaster);
      sqlite3OsDelete(pVfs, zMaster, 0);
      sqlite3DbFree(db, zMaster);
      return rc;
    }
................................................................................
      return rc;
    }

    /* Delete the master journal file. This commits the transaction. After
    ** doing this the directory is synced again before any individual
    ** transaction files are deleted.
    */
    rc = sqlite3OsDelete(pVfs, zMaster, 1);
    sqlite3DbFree(db, zMaster);
    zMaster = 0;
    if( rc ){
      return rc;
    }

    /* All files and directories have already been synced, so the following
................................................................................
  **
  ** Then the internal cache might have been left in an inconsistent
  ** state.  We need to rollback the statement transaction, if there is
  ** one, or the complete transaction if there is no statement transaction.
  */

  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM_BKPT;
  }
  if( p->aOnceFlag ) memset(p->aOnceFlag, 0, p->nOnceFlag);
  closeAllCursors(p);
  if( p->magic!=VDBE_MAGIC_RUN ){
    return SQLITE_OK;
  }
  checkActiveVdbeCnt(db);
................................................................................
    assert( db->nVdbeActive>=db->nVdbeRead );
    assert( db->nVdbeRead>=db->nVdbeWrite );
    assert( db->nVdbeWrite>=0 );
  }
  p->magic = VDBE_MAGIC_HALT;
  checkActiveVdbeCnt(db);
  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM_BKPT;
  }

  /* If the auto-commit flag is set to true, then any locks that were held
  ** by connection db have now been released. Call sqlite3ConnectionUnlocked() 
  ** to invoke any required unlock-notify callbacks.
  */
  if( db->autoCommit ){
................................................................................
**
**    * the associated function parameter is the 32nd or later (counting
**      from left to right), or
**
**    * the corresponding bit in argument mask is clear (where the first
**      function parameter corresponds to bit 0 etc.).
*/
void sqlite3VdbeDeleteAuxData(sqlite3 *db, AuxData **pp, int iOp, int mask){

  while( *pp ){
    AuxData *pAux = *pp;
    if( (iOp<0)
     || (pAux->iOp==iOp && (pAux->iArg>31 || !(mask & MASKBIT32(pAux->iArg))))
    ){
      testcase( pAux->iArg==31 );
      if( pAux->xDelete ){
        pAux->xDelete(pAux->pAux);
      }
      *pp = pAux->pNext;
      sqlite3DbFree(db, pAux);
    }else{
      pp= &pAux->pNext;
    }
  }
}

/*
................................................................................
    sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
    sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
    v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
    n1 = v1==0 ? 0 : c1.n;
    v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
    n2 = v2==0 ? 0 : c2.n;
    rc = pColl->xCmp(pColl->pUser, n1, v1, n2, v2);
    if( (v1==0 || v2==0) && prcErr ) *prcErr = SQLITE_NOMEM_BKPT;
    sqlite3VdbeMemRelease(&c1);
    sqlite3VdbeMemRelease(&c2);
    return rc;
  }
}

/*

      if( pMem->szMalloc>0 ) sqlite3DbFree(pMem->db, pMem->zMalloc);
      pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, n);
    }
    if( pMem->zMalloc==0 ){
      sqlite3VdbeMemSetNull(pMem);
      pMem->z = 0;
      pMem->szMalloc = 0;
      return SQLITE_NOMEM;
    }else{
      pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->zMalloc);
    }
  }

  if( bPreserve && pMem->z && pMem->z!=pMem->zMalloc ){
    memcpy(pMem->zMalloc, pMem->z, pMem->n);
................................................................................
  int f;
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  assert( (pMem->flags&MEM_RowSet)==0 );
  ExpandBlob(pMem);
  f = pMem->flags;
  if( (f&(MEM_Str|MEM_Blob)) && (pMem->szMalloc==0 || pMem->z!=pMem->zMalloc) ){
    if( sqlite3VdbeMemGrow(pMem, pMem->n + 2, 1) ){
      return SQLITE_NOMEM;
    }
    pMem->z[pMem->n] = 0;
    pMem->z[pMem->n+1] = 0;
    pMem->flags |= MEM_Term;
  }
  pMem->flags &= ~MEM_Ephem;
#ifdef SQLITE_DEBUG
................................................................................

    /* Set nByte to the number of bytes required to store the expanded blob. */
    nByte = pMem->n + pMem->u.nZero;
    if( nByte<=0 ){
      nByte = 1;
    }
    if( sqlite3VdbeMemGrow(pMem, nByte, 1) ){
      return SQLITE_NOMEM;
    }

    memset(&pMem->z[pMem->n], 0, pMem->u.nZero);
    pMem->n += pMem->u.nZero;
    pMem->flags &= ~(MEM_Zero|MEM_Term);
  }
  return SQLITE_OK;
................................................................................

/*
** It is already known that pMem contains an unterminated string.
** Add the zero terminator.
*/
static SQLITE_NOINLINE int vdbeMemAddTerminator(Mem *pMem){
  if( sqlite3VdbeMemGrow(pMem, pMem->n+2, 1) ){
    return SQLITE_NOMEM;
  }
  pMem->z[pMem->n] = 0;
  pMem->z[pMem->n+1] = 0;
  pMem->flags |= MEM_Term;
  return SQLITE_OK;
}

................................................................................
  assert( !(fg&(MEM_Str|MEM_Blob)) );
  assert( fg&(MEM_Int|MEM_Real) );
  assert( (pMem->flags&MEM_RowSet)==0 );
  assert( EIGHT_BYTE_ALIGNMENT(pMem) );


  if( sqlite3VdbeMemClearAndResize(pMem, nByte) ){
    return SQLITE_NOMEM;
  }

  /* For a Real or Integer, use sqlite3_snprintf() to produce the UTF-8
  ** string representation of the value. Then, if the required encoding
  ** is UTF-16le or UTF-16be do a translation.
  ** 
  ** FIX ME: It would be better if sqlite3_snprintf() could do UTF-16.
................................................................................
    if( nByte>iLimit ){
      return SQLITE_TOOBIG;
    }
    testcase( nAlloc==0 );
    testcase( nAlloc==31 );
    testcase( nAlloc==32 );
    if( sqlite3VdbeMemClearAndResize(pMem, MAX(nAlloc,32)) ){
      return SQLITE_NOMEM;
    }
    memcpy(pMem->z, z, nAlloc);
  }else if( xDel==SQLITE_DYNAMIC ){
    sqlite3VdbeMemRelease(pMem);
    pMem->zMalloc = pMem->z = (char *)z;
    pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->zMalloc);
  }else{
................................................................................

  pMem->n = nByte;
  pMem->flags = flags;
  pMem->enc = (enc==0 ? SQLITE_UTF8 : enc);

#ifndef SQLITE_OMIT_UTF16
  if( pMem->enc!=SQLITE_UTF8 && sqlite3VdbeMemHandleBom(pMem) ){
    return SQLITE_NOMEM;
  }
#endif

  if( nByte>iLimit ){
    return SQLITE_TOOBIG;
  }

................................................................................
){
  sqlite3_context ctx;            /* Context object for function invocation */
  sqlite3_value **apVal = 0;      /* Function arguments */
  int nVal = 0;                   /* Size of apVal[] array */
  FuncDef *pFunc = 0;             /* Function definition */
  sqlite3_value *pVal = 0;        /* New value */
  int rc = SQLITE_OK;             /* Return code */
  int nName;                      /* Size of function name in bytes */
  ExprList *pList = 0;            /* Function arguments */
  int i;                          /* Iterator variable */

  assert( pCtx!=0 );
  assert( (p->flags & EP_TokenOnly)==0 );
  pList = p->x.pList;
  if( pList ) nVal = pList->nExpr;
  nName = sqlite3Strlen30(p->u.zToken);
  pFunc = sqlite3FindFunction(db, p->u.zToken, nName, nVal, enc, 0);
  assert( pFunc );
  if( (pFunc->funcFlags & (SQLITE_FUNC_CONSTANT|SQLITE_FUNC_SLOCHNG))==0 
   || (pFunc->funcFlags & SQLITE_FUNC_NEEDCOLL)
  ){
    return SQLITE_OK;
  }

  if( pList ){
    apVal = (sqlite3_value**)sqlite3DbMallocZero(db, sizeof(apVal[0]) * nVal);
    if( apVal==0 ){
      rc = SQLITE_NOMEM;
      goto value_from_function_out;
    }
    for(i=0; i<nVal; i++){
      rc = sqlite3ValueFromExpr(db, pList->a[i].pExpr, enc, aff, &apVal[i]);
      if( apVal[i]==0 || rc!=SQLITE_OK ) goto value_from_function_out;
    }
  }

  pVal = valueNew(db, pCtx);
  if( pVal==0 ){
    rc = SQLITE_NOMEM;
    goto value_from_function_out;
  }

  assert( pCtx->pParse->rc==SQLITE_OK );
  memset(&ctx, 0, sizeof(ctx));
  ctx.pOut = pVal;
  ctx.pFunc = pFunc;
................................................................................
  sqlite3DbFree(db, zVal);
  assert( *ppVal==0 );
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  if( pCtx==0 ) sqlite3ValueFree(pVal);
#else
  assert( pCtx==0 ); sqlite3ValueFree(pVal);
#endif
  return SQLITE_NOMEM;
}

/*
** Create a new sqlite3_value object, containing the value of pExpr.
**
** This only works for very simple expressions that consist of one constant
** token (i.e. "5", "5.1", "'a string'"). If the expression can
................................................................................
  }
}

/*
** Register built-in functions used to help read ANALYZE data.
*/
void sqlite3AnalyzeFunctions(void){
  static SQLITE_WSD FuncDef aAnalyzeTableFuncs[] = {
    FUNCTION(sqlite_record,   1, 0, 0, recordFunc),
  };
  int i;
  FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
  FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aAnalyzeTableFuncs);
  for(i=0; i<ArraySize(aAnalyzeTableFuncs); i++){
    sqlite3FuncDefInsert(pHash, &aFunc[i]);
  }
}

/*
** Attempt to extract a value from pExpr and use it to construct *ppVal.
**
** If pAlloc is not NULL, then an UnpackedRecord object is created for
** pAlloc if one does not exist and the new value is added to the
................................................................................
    iField += szField;
  }
  testcase( iField==nRec );
  testcase( iField==nRec+1 );
  if( iField>nRec ) return SQLITE_CORRUPT_BKPT;
  if( pMem==0 ){
    pMem = *ppVal = sqlite3ValueNew(db);
    if( pMem==0 ) return SQLITE_NOMEM;
  }
  sqlite3VdbeSerialGet(&a[iField-szField], t, pMem);
  pMem->enc = ENC(db);
  return SQLITE_OK;
}

/*

      if( pMem->szMalloc>0 ) sqlite3DbFree(pMem->db, pMem->zMalloc);
      pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, n);
    }
    if( pMem->zMalloc==0 ){
      sqlite3VdbeMemSetNull(pMem);
      pMem->z = 0;
      pMem->szMalloc = 0;
      return SQLITE_NOMEM_BKPT;
    }else{
      pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->zMalloc);
    }
  }

  if( bPreserve && pMem->z && pMem->z!=pMem->zMalloc ){
    memcpy(pMem->zMalloc, pMem->z, pMem->n);
................................................................................
  int f;
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  assert( (pMem->flags&MEM_RowSet)==0 );
  ExpandBlob(pMem);
  f = pMem->flags;
  if( (f&(MEM_Str|MEM_Blob)) && (pMem->szMalloc==0 || pMem->z!=pMem->zMalloc) ){
    if( sqlite3VdbeMemGrow(pMem, pMem->n + 2, 1) ){
      return SQLITE_NOMEM_BKPT;
    }
    pMem->z[pMem->n] = 0;
    pMem->z[pMem->n+1] = 0;
    pMem->flags |= MEM_Term;
  }
  pMem->flags &= ~MEM_Ephem;
#ifdef SQLITE_DEBUG
................................................................................

    /* Set nByte to the number of bytes required to store the expanded blob. */
    nByte = pMem->n + pMem->u.nZero;
    if( nByte<=0 ){
      nByte = 1;
    }
    if( sqlite3VdbeMemGrow(pMem, nByte, 1) ){
      return SQLITE_NOMEM_BKPT;
    }

    memset(&pMem->z[pMem->n], 0, pMem->u.nZero);
    pMem->n += pMem->u.nZero;
    pMem->flags &= ~(MEM_Zero|MEM_Term);
  }
  return SQLITE_OK;
................................................................................

/*
** It is already known that pMem contains an unterminated string.
** Add the zero terminator.
*/
static SQLITE_NOINLINE int vdbeMemAddTerminator(Mem *pMem){
  if( sqlite3VdbeMemGrow(pMem, pMem->n+2, 1) ){
    return SQLITE_NOMEM_BKPT;
  }
  pMem->z[pMem->n] = 0;
  pMem->z[pMem->n+1] = 0;
  pMem->flags |= MEM_Term;
  return SQLITE_OK;
}

................................................................................
  assert( !(fg&(MEM_Str|MEM_Blob)) );
  assert( fg&(MEM_Int|MEM_Real) );
  assert( (pMem->flags&MEM_RowSet)==0 );
  assert( EIGHT_BYTE_ALIGNMENT(pMem) );


  if( sqlite3VdbeMemClearAndResize(pMem, nByte) ){
    return SQLITE_NOMEM_BKPT;
  }

  /* For a Real or Integer, use sqlite3_snprintf() to produce the UTF-8
  ** string representation of the value. Then, if the required encoding
  ** is UTF-16le or UTF-16be do a translation.
  ** 
  ** FIX ME: It would be better if sqlite3_snprintf() could do UTF-16.
................................................................................
    if( nByte>iLimit ){
      return SQLITE_TOOBIG;
    }
    testcase( nAlloc==0 );
    testcase( nAlloc==31 );
    testcase( nAlloc==32 );
    if( sqlite3VdbeMemClearAndResize(pMem, MAX(nAlloc,32)) ){
      return SQLITE_NOMEM_BKPT;
    }
    memcpy(pMem->z, z, nAlloc);
  }else if( xDel==SQLITE_DYNAMIC ){
    sqlite3VdbeMemRelease(pMem);
    pMem->zMalloc = pMem->z = (char *)z;
    pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->zMalloc);
  }else{
................................................................................

  pMem->n = nByte;
  pMem->flags = flags;
  pMem->enc = (enc==0 ? SQLITE_UTF8 : enc);

#ifndef SQLITE_OMIT_UTF16
  if( pMem->enc!=SQLITE_UTF8 && sqlite3VdbeMemHandleBom(pMem) ){
    return SQLITE_NOMEM_BKPT;
  }
#endif

  if( nByte>iLimit ){
    return SQLITE_TOOBIG;
  }

................................................................................
){
  sqlite3_context ctx;            /* Context object for function invocation */
  sqlite3_value **apVal = 0;      /* Function arguments */
  int nVal = 0;                   /* Size of apVal[] array */
  FuncDef *pFunc = 0;             /* Function definition */
  sqlite3_value *pVal = 0;        /* New value */
  int rc = SQLITE_OK;             /* Return code */

  ExprList *pList = 0;            /* Function arguments */
  int i;                          /* Iterator variable */

  assert( pCtx!=0 );
  assert( (p->flags & EP_TokenOnly)==0 );
  pList = p->x.pList;
  if( pList ) nVal = pList->nExpr;

  pFunc = sqlite3FindFunction(db, p->u.zToken, nVal, enc, 0);
  assert( pFunc );
  if( (pFunc->funcFlags & (SQLITE_FUNC_CONSTANT|SQLITE_FUNC_SLOCHNG))==0 
   || (pFunc->funcFlags & SQLITE_FUNC_NEEDCOLL)
  ){
    return SQLITE_OK;
  }

  if( pList ){
    apVal = (sqlite3_value**)sqlite3DbMallocZero(db, sizeof(apVal[0]) * nVal);
    if( apVal==0 ){
      rc = SQLITE_NOMEM_BKPT;
      goto value_from_function_out;
    }
    for(i=0; i<nVal; i++){
      rc = sqlite3ValueFromExpr(db, pList->a[i].pExpr, enc, aff, &apVal[i]);
      if( apVal[i]==0 || rc!=SQLITE_OK ) goto value_from_function_out;
    }
  }

  pVal = valueNew(db, pCtx);
  if( pVal==0 ){
    rc = SQLITE_NOMEM_BKPT;
    goto value_from_function_out;
  }

  assert( pCtx->pParse->rc==SQLITE_OK );
  memset(&ctx, 0, sizeof(ctx));
  ctx.pOut = pVal;
  ctx.pFunc = pFunc;
................................................................................
  sqlite3DbFree(db, zVal);
  assert( *ppVal==0 );
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  if( pCtx==0 ) sqlite3ValueFree(pVal);
#else
  assert( pCtx==0 ); sqlite3ValueFree(pVal);
#endif
  return SQLITE_NOMEM_BKPT;
}

/*
** Create a new sqlite3_value object, containing the value of pExpr.
**
** This only works for very simple expressions that consist of one constant
** token (i.e. "5", "5.1", "'a string'"). If the expression can
................................................................................
  }
}

/*
** Register built-in functions used to help read ANALYZE data.
*/
void sqlite3AnalyzeFunctions(void){
  static FuncDef aAnalyzeTableFuncs[] = {
    FUNCTION(sqlite_record,   1, 0, 0, recordFunc),
  };



  sqlite3InsertBuiltinFuncs(aAnalyzeTableFuncs, ArraySize(aAnalyzeTableFuncs));


}

/*
** Attempt to extract a value from pExpr and use it to construct *ppVal.
**
** If pAlloc is not NULL, then an UnpackedRecord object is created for
** pAlloc if one does not exist and the new value is added to the
................................................................................
    iField += szField;
  }
  testcase( iField==nRec );
  testcase( iField==nRec+1 );
  if( iField>nRec ) return SQLITE_CORRUPT_BKPT;
  if( pMem==0 ){
    pMem = *ppVal = sqlite3ValueNew(db);
    if( pMem==0 ) return SQLITE_NOMEM_BKPT;
  }
  sqlite3VdbeSerialGet(&a[iField-szField], t, pMem);
  pMem->enc = ENC(db);
  return SQLITE_OK;
}

/*

    /* Extend the p->aAlloc[] allocation if required. */
    if( p->nAlloc<nByte ){
      u8 *aNew;
      int nNew = MAX(128, p->nAlloc*2);
      while( nByte>nNew ) nNew = nNew*2;
      aNew = sqlite3Realloc(p->aAlloc, nNew);
      if( !aNew ) return SQLITE_NOMEM;
      p->nAlloc = nNew;
      p->aAlloc = aNew;
    }

    /* Copy as much data as is available in the buffer into the start of
    ** p->aAlloc[].  */
    memcpy(p->aAlloc, &p->aBuffer[iBuf], nAvail);
................................................................................

  rc = vdbeSorterMapFile(pTask, pFile, &pReadr->aMap);
  if( rc==SQLITE_OK && pReadr->aMap==0 ){
    int pgsz = pTask->pSorter->pgsz;
    int iBuf = pReadr->iReadOff % pgsz;
    if( pReadr->aBuffer==0 ){
      pReadr->aBuffer = (u8*)sqlite3Malloc(pgsz);
      if( pReadr->aBuffer==0 ) rc = SQLITE_NOMEM;
      pReadr->nBuffer = pgsz;
    }
    if( rc==SQLITE_OK && iBuf ){
      int nRead = pgsz - iBuf;
      if( (pReadr->iReadOff + nRead) > pReadr->iEof ){
        nRead = (int)(pReadr->iEof - pReadr->iReadOff);
      }
................................................................................
  assert( pCsr->eCurType==CURTYPE_SORTER );
  szKeyInfo = sizeof(KeyInfo) + (pCsr->pKeyInfo->nField-1)*sizeof(CollSeq*);
  sz = sizeof(VdbeSorter) + nWorker * sizeof(SortSubtask);

  pSorter = (VdbeSorter*)sqlite3DbMallocZero(db, sz + szKeyInfo);
  pCsr->uc.pSorter = pSorter;
  if( pSorter==0 ){
    rc = SQLITE_NOMEM;
  }else{
    pSorter->pKeyInfo = pKeyInfo = (KeyInfo*)((u8*)pSorter + sz);
    memcpy(pKeyInfo, pCsr->pKeyInfo, szKeyInfo);
    pKeyInfo->db = 0;
    if( nField && nWorker==0 ){
      pKeyInfo->nXField += (pKeyInfo->nField - nField);
      pKeyInfo->nField = nField;
................................................................................
      ** scratch memory using SQLITE_CONFIG_SCRATCH, SQLite avoids unnecessary
      ** large heap allocations.
      */
      if( sqlite3GlobalConfig.pScratch==0 ){
        assert( pSorter->iMemory==0 );
        pSorter->nMemory = pgsz;
        pSorter->list.aMemory = (u8*)sqlite3Malloc(pgsz);
        if( !pSorter->list.aMemory ) rc = SQLITE_NOMEM;
      }
    }

    if( (pKeyInfo->nField+pKeyInfo->nXField)<13 
     && (pKeyInfo->aColl[0]==0 || pKeyInfo->aColl[0]==db->pDfltColl)
    ){
      pSorter->typeMask = SORTER_TYPE_INTEGER | SORTER_TYPE_TEXT;
................................................................................
static int vdbeSortAllocUnpacked(SortSubtask *pTask){
  if( pTask->pUnpacked==0 ){
    char *pFree;
    pTask->pUnpacked = sqlite3VdbeAllocUnpackedRecord(
        pTask->pSorter->pKeyInfo, 0, 0, &pFree
    );
    assert( pTask->pUnpacked==(UnpackedRecord*)pFree );
    if( pFree==0 ) return SQLITE_NOMEM;
    pTask->pUnpacked->nField = pTask->pSorter->pKeyInfo->nField;
    pTask->pUnpacked->errCode = 0;
  }
  return SQLITE_OK;
}


................................................................................
  if( rc!=SQLITE_OK ) return rc;

  p = pList->pList;
  pTask->xCompare = vdbeSorterGetCompare(pTask->pSorter);

  aSlot = (SorterRecord **)sqlite3MallocZero(64 * sizeof(SorterRecord *));
  if( !aSlot ){
    return SQLITE_NOMEM;
  }

  while( p ){
    SorterRecord *pNext;
    if( pList->aMemory ){
      if( (u8*)p==pList->aMemory ){
        pNext = 0;
................................................................................
  PmaWriter *p,                   /* Object to populate */
  int nBuf,                       /* Buffer size */
  i64 iStart                      /* Offset of pFd to begin writing at */
){
  memset(p, 0, sizeof(PmaWriter));
  p->aBuffer = (u8*)sqlite3Malloc(nBuf);
  if( !p->aBuffer ){
    p->eFWErr = SQLITE_NOMEM;
  }else{
    p->iBufEnd = p->iBufStart = (iStart % nBuf);
    p->iWriteOff = iStart - p->iBufStart;
    p->nBuffer = nBuf;
    p->pFd = pFd;
  }
}
................................................................................
      pSorter->list.pList = 0;
      pSorter->list.szPMA = 0;
      if( aMem ){
        pSorter->list.aMemory = aMem;
        pSorter->nMemory = sqlite3MallocSize(aMem);
      }else if( pSorter->list.aMemory ){
        pSorter->list.aMemory = sqlite3Malloc(pSorter->nMemory);
        if( !pSorter->list.aMemory ) return SQLITE_NOMEM;
      }

      rc = vdbeSorterCreateThread(pTask, vdbeSorterFlushThread, pCtx);
    }
  }

  return rc;
................................................................................
      int iListOff = (u8*)pSorter->list.pList - pSorter->list.aMemory;
      int nNew = pSorter->nMemory * 2;
      while( nNew < nMin ) nNew = nNew*2;
      if( nNew > pSorter->mxPmaSize ) nNew = pSorter->mxPmaSize;
      if( nNew < nMin ) nNew = nMin;

      aNew = sqlite3Realloc(pSorter->list.aMemory, nNew);
      if( !aNew ) return SQLITE_NOMEM;
      pSorter->list.pList = (SorterRecord*)&aNew[iListOff];
      pSorter->list.aMemory = aNew;
      pSorter->nMemory = nNew;
    }

    pNew = (SorterRecord*)&pSorter->list.aMemory[pSorter->iMemory];
    pSorter->iMemory += ROUND8(nReq);
    if( pSorter->list.pList ){
      pNew->u.iNext = (int)((u8*)(pSorter->list.pList) - pSorter->list.aMemory);
    }
  }else{
    pNew = (SorterRecord *)sqlite3Malloc(nReq);
    if( pNew==0 ){
      return SQLITE_NOMEM;
    }
    pNew->u.pNext = pSorter->list.pList;
  }

  memcpy(SRVAL(pNew), pVal->z, pVal->n);
  pNew->nVal = pVal->n;
  pSorter->list.pList = pNew;
................................................................................
  if( pIncr ){
    pIncr->pMerger = pMerger;
    pIncr->pTask = pTask;
    pIncr->mxSz = MAX(pTask->pSorter->mxKeysize+9,pTask->pSorter->mxPmaSize/2);
    pTask->file2.iEof += pIncr->mxSz;
  }else{
    vdbeMergeEngineFree(pMerger);
    rc = SQLITE_NOMEM;
  }
  return rc;
}

#if SQLITE_MAX_WORKER_THREADS>0
/*
** Set the "use-threads" flag on object pIncr.
................................................................................
){
  MergeEngine *pNew;              /* Merge engine to return */
  i64 iOff = *piOffset;
  int i;
  int rc = SQLITE_OK;

  *ppOut = pNew = vdbeMergeEngineNew(nPMA);
  if( pNew==0 ) rc = SQLITE_NOMEM;

  for(i=0; i<nPMA && rc==SQLITE_OK; i++){
    i64 nDummy;
    PmaReader *pReadr = &pNew->aReadr[i];
    rc = vdbePmaReaderInit(pTask, &pTask->file, iOff, pReadr, &nDummy);
    iOff = pReadr->iEof;
  }

  if( rc!=SQLITE_OK ){
    vdbeMergeEngineFree(pNew);
................................................................................
  for(i=1; i<nDepth && rc==SQLITE_OK; i++){
    int iIter = (iSeq / nDiv) % SORTER_MAX_MERGE_COUNT;
    PmaReader *pReadr = &p->aReadr[iIter];

    if( pReadr->pIncr==0 ){
      MergeEngine *pNew = vdbeMergeEngineNew(SORTER_MAX_MERGE_COUNT);
      if( pNew==0 ){
        rc = SQLITE_NOMEM;
      }else{
        rc = vdbeIncrMergerNew(pTask, pNew, &pReadr->pIncr);
      }
    }
    if( rc==SQLITE_OK ){
      p = pReadr->pIncr->pMerger;
      nDiv = nDiv / SORTER_MAX_MERGE_COUNT;
................................................................................
#if SQLITE_MAX_WORKER_THREADS>0
  /* If the sorter uses more than one task, then create the top-level 
  ** MergeEngine here. This MergeEngine will read data from exactly 
  ** one PmaReader per sub-task.  */
  assert( pSorter->bUseThreads || pSorter->nTask==1 );
  if( pSorter->nTask>1 ){
    pMain = vdbeMergeEngineNew(pSorter->nTask);
    if( pMain==0 ) rc = SQLITE_NOMEM;
  }
#endif

  for(iTask=0; rc==SQLITE_OK && iTask<pSorter->nTask; iTask++){
    SortSubtask *pTask = &pSorter->aTask[iTask];
    assert( pTask->nPMA>0 || SQLITE_MAX_WORKER_THREADS>0 );
    if( SQLITE_MAX_WORKER_THREADS==0 || pTask->nPMA ){
................................................................................

      if( pTask->nPMA<=SORTER_MAX_MERGE_COUNT ){
        rc = vdbeMergeEngineLevel0(pTask, pTask->nPMA, &iReadOff, &pRoot);
      }else{
        int i;
        int iSeq = 0;
        pRoot = vdbeMergeEngineNew(SORTER_MAX_MERGE_COUNT);
        if( pRoot==0 ) rc = SQLITE_NOMEM;
        for(i=0; i<pTask->nPMA && rc==SQLITE_OK; i += SORTER_MAX_MERGE_COUNT){
          MergeEngine *pMerger = 0; /* New level-0 PMA merger */
          int nReader;              /* Number of level-0 PMAs to merge */

          nReader = MIN(pTask->nPMA - i, SORTER_MAX_MERGE_COUNT);
          rc = vdbeMergeEngineLevel0(pTask, nReader, &iReadOff, &pMerger);
          if( rc==SQLITE_OK ){
................................................................................
      int iTask;
      PmaReader *pReadr = 0;
      SortSubtask *pLast = &pSorter->aTask[pSorter->nTask-1];
      rc = vdbeSortAllocUnpacked(pLast);
      if( rc==SQLITE_OK ){
        pReadr = (PmaReader*)sqlite3DbMallocZero(db, sizeof(PmaReader));
        pSorter->pReader = pReadr;
        if( pReadr==0 ) rc = SQLITE_NOMEM;
      }
      if( rc==SQLITE_OK ){
        rc = vdbeIncrMergerNew(pLast, pMain, &pReadr->pIncr);
        if( rc==SQLITE_OK ){
          vdbeIncrMergerSetThreads(pReadr->pIncr);
          for(iTask=0; iTask<(pSorter->nTask-1); iTask++){
            IncrMerger *pIncr;
................................................................................
  VdbeSorter *pSorter;
  void *pKey; int nKey;           /* Sorter key to copy into pOut */

  assert( pCsr->eCurType==CURTYPE_SORTER );
  pSorter = pCsr->uc.pSorter;
  pKey = vdbeSorterRowkey(pSorter, &nKey);
  if( sqlite3VdbeMemClearAndResize(pOut, nKey) ){
    return SQLITE_NOMEM;
  }
  pOut->n = nKey;
  MemSetTypeFlag(pOut, MEM_Blob);
  memcpy(pOut->z, pKey, nKey);

  return SQLITE_OK;
}
................................................................................
  pSorter = pCsr->uc.pSorter;
  r2 = pSorter->pUnpacked;
  pKeyInfo = pCsr->pKeyInfo;
  if( r2==0 ){
    char *p;
    r2 = pSorter->pUnpacked = sqlite3VdbeAllocUnpackedRecord(pKeyInfo,0,0,&p);
    assert( pSorter->pUnpacked==(UnpackedRecord*)p );
    if( r2==0 ) return SQLITE_NOMEM;
    r2->nField = nKeyCol;
  }
  assert( r2->nField==nKeyCol );

  pKey = vdbeSorterRowkey(pSorter, &nKey);
  sqlite3VdbeRecordUnpack(pKeyInfo, nKey, pKey, r2);
  for(i=0; i<nKeyCol; i++){

    /* Extend the p->aAlloc[] allocation if required. */
    if( p->nAlloc<nByte ){
      u8 *aNew;
      int nNew = MAX(128, p->nAlloc*2);
      while( nByte>nNew ) nNew = nNew*2;
      aNew = sqlite3Realloc(p->aAlloc, nNew);
      if( !aNew ) return SQLITE_NOMEM_BKPT;
      p->nAlloc = nNew;
      p->aAlloc = aNew;
    }

    /* Copy as much data as is available in the buffer into the start of
    ** p->aAlloc[].  */
    memcpy(p->aAlloc, &p->aBuffer[iBuf], nAvail);
................................................................................

  rc = vdbeSorterMapFile(pTask, pFile, &pReadr->aMap);
  if( rc==SQLITE_OK && pReadr->aMap==0 ){
    int pgsz = pTask->pSorter->pgsz;
    int iBuf = pReadr->iReadOff % pgsz;
    if( pReadr->aBuffer==0 ){
      pReadr->aBuffer = (u8*)sqlite3Malloc(pgsz);
      if( pReadr->aBuffer==0 ) rc = SQLITE_NOMEM_BKPT;
      pReadr->nBuffer = pgsz;
    }
    if( rc==SQLITE_OK && iBuf ){
      int nRead = pgsz - iBuf;
      if( (pReadr->iReadOff + nRead) > pReadr->iEof ){
        nRead = (int)(pReadr->iEof - pReadr->iReadOff);
      }
................................................................................
  assert( pCsr->eCurType==CURTYPE_SORTER );
  szKeyInfo = sizeof(KeyInfo) + (pCsr->pKeyInfo->nField-1)*sizeof(CollSeq*);
  sz = sizeof(VdbeSorter) + nWorker * sizeof(SortSubtask);

  pSorter = (VdbeSorter*)sqlite3DbMallocZero(db, sz + szKeyInfo);
  pCsr->uc.pSorter = pSorter;
  if( pSorter==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }else{
    pSorter->pKeyInfo = pKeyInfo = (KeyInfo*)((u8*)pSorter + sz);
    memcpy(pKeyInfo, pCsr->pKeyInfo, szKeyInfo);
    pKeyInfo->db = 0;
    if( nField && nWorker==0 ){
      pKeyInfo->nXField += (pKeyInfo->nField - nField);
      pKeyInfo->nField = nField;
................................................................................
      ** scratch memory using SQLITE_CONFIG_SCRATCH, SQLite avoids unnecessary
      ** large heap allocations.
      */
      if( sqlite3GlobalConfig.pScratch==0 ){
        assert( pSorter->iMemory==0 );
        pSorter->nMemory = pgsz;
        pSorter->list.aMemory = (u8*)sqlite3Malloc(pgsz);
        if( !pSorter->list.aMemory ) rc = SQLITE_NOMEM_BKPT;
      }
    }

    if( (pKeyInfo->nField+pKeyInfo->nXField)<13 
     && (pKeyInfo->aColl[0]==0 || pKeyInfo->aColl[0]==db->pDfltColl)
    ){
      pSorter->typeMask = SORTER_TYPE_INTEGER | SORTER_TYPE_TEXT;
................................................................................
static int vdbeSortAllocUnpacked(SortSubtask *pTask){
  if( pTask->pUnpacked==0 ){
    char *pFree;
    pTask->pUnpacked = sqlite3VdbeAllocUnpackedRecord(
        pTask->pSorter->pKeyInfo, 0, 0, &pFree
    );
    assert( pTask->pUnpacked==(UnpackedRecord*)pFree );
    if( pFree==0 ) return SQLITE_NOMEM_BKPT;
    pTask->pUnpacked->nField = pTask->pSorter->pKeyInfo->nField;
    pTask->pUnpacked->errCode = 0;
  }
  return SQLITE_OK;
}


................................................................................
  if( rc!=SQLITE_OK ) return rc;

  p = pList->pList;
  pTask->xCompare = vdbeSorterGetCompare(pTask->pSorter);

  aSlot = (SorterRecord **)sqlite3MallocZero(64 * sizeof(SorterRecord *));
  if( !aSlot ){
    return SQLITE_NOMEM_BKPT;
  }

  while( p ){
    SorterRecord *pNext;
    if( pList->aMemory ){
      if( (u8*)p==pList->aMemory ){
        pNext = 0;
................................................................................
  PmaWriter *p,                   /* Object to populate */
  int nBuf,                       /* Buffer size */
  i64 iStart                      /* Offset of pFd to begin writing at */
){
  memset(p, 0, sizeof(PmaWriter));
  p->aBuffer = (u8*)sqlite3Malloc(nBuf);
  if( !p->aBuffer ){
    p->eFWErr = SQLITE_NOMEM_BKPT;
  }else{
    p->iBufEnd = p->iBufStart = (iStart % nBuf);
    p->iWriteOff = iStart - p->iBufStart;
    p->nBuffer = nBuf;
    p->pFd = pFd;
  }
}
................................................................................
      pSorter->list.pList = 0;
      pSorter->list.szPMA = 0;
      if( aMem ){
        pSorter->list.aMemory = aMem;
        pSorter->nMemory = sqlite3MallocSize(aMem);
      }else if( pSorter->list.aMemory ){
        pSorter->list.aMemory = sqlite3Malloc(pSorter->nMemory);
        if( !pSorter->list.aMemory ) return SQLITE_NOMEM_BKPT;
      }

      rc = vdbeSorterCreateThread(pTask, vdbeSorterFlushThread, pCtx);
    }
  }

  return rc;
................................................................................
      int iListOff = (u8*)pSorter->list.pList - pSorter->list.aMemory;
      int nNew = pSorter->nMemory * 2;
      while( nNew < nMin ) nNew = nNew*2;
      if( nNew > pSorter->mxPmaSize ) nNew = pSorter->mxPmaSize;
      if( nNew < nMin ) nNew = nMin;

      aNew = sqlite3Realloc(pSorter->list.aMemory, nNew);
      if( !aNew ) return SQLITE_NOMEM_BKPT;
      pSorter->list.pList = (SorterRecord*)&aNew[iListOff];
      pSorter->list.aMemory = aNew;
      pSorter->nMemory = nNew;
    }

    pNew = (SorterRecord*)&pSorter->list.aMemory[pSorter->iMemory];
    pSorter->iMemory += ROUND8(nReq);
    if( pSorter->list.pList ){
      pNew->u.iNext = (int)((u8*)(pSorter->list.pList) - pSorter->list.aMemory);
    }
  }else{
    pNew = (SorterRecord *)sqlite3Malloc(nReq);
    if( pNew==0 ){
      return SQLITE_NOMEM_BKPT;
    }
    pNew->u.pNext = pSorter->list.pList;
  }

  memcpy(SRVAL(pNew), pVal->z, pVal->n);
  pNew->nVal = pVal->n;
  pSorter->list.pList = pNew;
................................................................................
  if( pIncr ){
    pIncr->pMerger = pMerger;
    pIncr->pTask = pTask;
    pIncr->mxSz = MAX(pTask->pSorter->mxKeysize+9,pTask->pSorter->mxPmaSize/2);
    pTask->file2.iEof += pIncr->mxSz;
  }else{
    vdbeMergeEngineFree(pMerger);
    rc = SQLITE_NOMEM_BKPT;
  }
  return rc;
}

#if SQLITE_MAX_WORKER_THREADS>0
/*
** Set the "use-threads" flag on object pIncr.
................................................................................
){
  MergeEngine *pNew;              /* Merge engine to return */
  i64 iOff = *piOffset;
  int i;
  int rc = SQLITE_OK;

  *ppOut = pNew = vdbeMergeEngineNew(nPMA);
  if( pNew==0 ) rc = SQLITE_NOMEM_BKPT;

  for(i=0; i<nPMA && rc==SQLITE_OK; i++){
    i64 nDummy = 0;
    PmaReader *pReadr = &pNew->aReadr[i];
    rc = vdbePmaReaderInit(pTask, &pTask->file, iOff, pReadr, &nDummy);
    iOff = pReadr->iEof;
  }

  if( rc!=SQLITE_OK ){
    vdbeMergeEngineFree(pNew);
................................................................................
  for(i=1; i<nDepth && rc==SQLITE_OK; i++){
    int iIter = (iSeq / nDiv) % SORTER_MAX_MERGE_COUNT;
    PmaReader *pReadr = &p->aReadr[iIter];

    if( pReadr->pIncr==0 ){
      MergeEngine *pNew = vdbeMergeEngineNew(SORTER_MAX_MERGE_COUNT);
      if( pNew==0 ){
        rc = SQLITE_NOMEM_BKPT;
      }else{
        rc = vdbeIncrMergerNew(pTask, pNew, &pReadr->pIncr);
      }
    }
    if( rc==SQLITE_OK ){
      p = pReadr->pIncr->pMerger;
      nDiv = nDiv / SORTER_MAX_MERGE_COUNT;
................................................................................
#if SQLITE_MAX_WORKER_THREADS>0
  /* If the sorter uses more than one task, then create the top-level 
  ** MergeEngine here. This MergeEngine will read data from exactly 
  ** one PmaReader per sub-task.  */
  assert( pSorter->bUseThreads || pSorter->nTask==1 );
  if( pSorter->nTask>1 ){
    pMain = vdbeMergeEngineNew(pSorter->nTask);
    if( pMain==0 ) rc = SQLITE_NOMEM_BKPT;
  }
#endif

  for(iTask=0; rc==SQLITE_OK && iTask<pSorter->nTask; iTask++){
    SortSubtask *pTask = &pSorter->aTask[iTask];
    assert( pTask->nPMA>0 || SQLITE_MAX_WORKER_THREADS>0 );
    if( SQLITE_MAX_WORKER_THREADS==0 || pTask->nPMA ){
................................................................................

      if( pTask->nPMA<=SORTER_MAX_MERGE_COUNT ){
        rc = vdbeMergeEngineLevel0(pTask, pTask->nPMA, &iReadOff, &pRoot);
      }else{
        int i;
        int iSeq = 0;
        pRoot = vdbeMergeEngineNew(SORTER_MAX_MERGE_COUNT);
        if( pRoot==0 ) rc = SQLITE_NOMEM_BKPT;
        for(i=0; i<pTask->nPMA && rc==SQLITE_OK; i += SORTER_MAX_MERGE_COUNT){
          MergeEngine *pMerger = 0; /* New level-0 PMA merger */
          int nReader;              /* Number of level-0 PMAs to merge */

          nReader = MIN(pTask->nPMA - i, SORTER_MAX_MERGE_COUNT);
          rc = vdbeMergeEngineLevel0(pTask, nReader, &iReadOff, &pMerger);
          if( rc==SQLITE_OK ){
................................................................................
      int iTask;
      PmaReader *pReadr = 0;
      SortSubtask *pLast = &pSorter->aTask[pSorter->nTask-1];
      rc = vdbeSortAllocUnpacked(pLast);
      if( rc==SQLITE_OK ){
        pReadr = (PmaReader*)sqlite3DbMallocZero(db, sizeof(PmaReader));
        pSorter->pReader = pReadr;
        if( pReadr==0 ) rc = SQLITE_NOMEM_BKPT;
      }
      if( rc==SQLITE_OK ){
        rc = vdbeIncrMergerNew(pLast, pMain, &pReadr->pIncr);
        if( rc==SQLITE_OK ){
          vdbeIncrMergerSetThreads(pReadr->pIncr);
          for(iTask=0; iTask<(pSorter->nTask-1); iTask++){
            IncrMerger *pIncr;
................................................................................
  VdbeSorter *pSorter;
  void *pKey; int nKey;           /* Sorter key to copy into pOut */

  assert( pCsr->eCurType==CURTYPE_SORTER );
  pSorter = pCsr->uc.pSorter;
  pKey = vdbeSorterRowkey(pSorter, &nKey);
  if( sqlite3VdbeMemClearAndResize(pOut, nKey) ){
    return SQLITE_NOMEM_BKPT;
  }
  pOut->n = nKey;
  MemSetTypeFlag(pOut, MEM_Blob);
  memcpy(pOut->z, pKey, nKey);

  return SQLITE_OK;
}
................................................................................
  pSorter = pCsr->uc.pSorter;
  r2 = pSorter->pUnpacked;
  pKeyInfo = pCsr->pKeyInfo;
  if( r2==0 ){
    char *p;
    r2 = pSorter->pUnpacked = sqlite3VdbeAllocUnpackedRecord(pKeyInfo,0,0,&p);
    assert( pSorter->pUnpacked==(UnpackedRecord*)p );
    if( r2==0 ) return SQLITE_NOMEM_BKPT;
    r2->nField = nKeyCol;
  }
  assert( r2->nField==nKeyCol );

  pKey = vdbeSorterRowkey(pSorter, &nKey);
  sqlite3VdbeRecordUnpack(pKeyInfo, nKey, pKey, r2);
  for(i=0; i<nKeyCol; i++){

      );
      return SQLITE_LOCKED;
    }
  }

  zModuleName = sqlite3MPrintf(db, "%s", pTab->zName);
  if( !zModuleName ){
    return SQLITE_NOMEM;
  }

  pVTable = sqlite3DbMallocZero(db, sizeof(VTable));
  if( !pVTable ){
    sqlite3DbFree(db, zModuleName);
    return SQLITE_NOMEM;
  }
  pVTable->db = db;
  pVTable->pMod = pMod;

  iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
  pTab->azModuleArg[1] = db->aDb[iDb].zName;

................................................................................

  /* Grow the sqlite3.aVTrans array if required */
  if( (db->nVTrans%ARRAY_INCR)==0 ){
    VTable **aVTrans;
    int nBytes = sizeof(sqlite3_vtab *) * (db->nVTrans + ARRAY_INCR);
    aVTrans = sqlite3DbRealloc(db, (void *)db->aVTrans, nBytes);
    if( !aVTrans ){
      return SQLITE_NOMEM;
    }
    memset(&aVTrans[db->nVTrans], 0, sizeof(sqlite3_vtab *)*ARRAY_INCR);
    db->aVTrans = aVTrans;
  }

  return SQLITE_OK;
}
................................................................................
    return SQLITE_MISUSE_BKPT;
  }
  pTab = pCtx->pTab;
  assert( (pTab->tabFlags & TF_Virtual)!=0 );

  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
  if( pParse==0 ){
    rc = SQLITE_NOMEM;
  }else{
    pParse->declareVtab = 1;
    pParse->db = db;
    pParse->nQueryLoop = 1;
  
    if( SQLITE_OK==sqlite3RunParser(pParse, zCreateTable, &zErr) 
     && pParse->pNewTable
................................................................................
  ** function */
  pNew = sqlite3DbMallocZero(db, sizeof(*pNew)
                             + sqlite3Strlen30(pDef->zName) + 1);
  if( pNew==0 ){
    return pDef;
  }
  *pNew = *pDef;
  pNew->zName = (char *)&pNew[1];
  memcpy(pNew->zName, pDef->zName, sqlite3Strlen30(pDef->zName)+1);
  pNew->xSFunc = xSFunc;
  pNew->pUserData = pArg;
  pNew->funcFlags |= SQLITE_FUNC_EPHEM;
  return pNew;
}

/*

      );
      return SQLITE_LOCKED;
    }
  }

  zModuleName = sqlite3MPrintf(db, "%s", pTab->zName);
  if( !zModuleName ){
    return SQLITE_NOMEM_BKPT;
  }

  pVTable = sqlite3DbMallocZero(db, sizeof(VTable));
  if( !pVTable ){
    sqlite3DbFree(db, zModuleName);
    return SQLITE_NOMEM_BKPT;
  }
  pVTable->db = db;
  pVTable->pMod = pMod;

  iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
  pTab->azModuleArg[1] = db->aDb[iDb].zName;

................................................................................

  /* Grow the sqlite3.aVTrans array if required */
  if( (db->nVTrans%ARRAY_INCR)==0 ){
    VTable **aVTrans;
    int nBytes = sizeof(sqlite3_vtab *) * (db->nVTrans + ARRAY_INCR);
    aVTrans = sqlite3DbRealloc(db, (void *)db->aVTrans, nBytes);
    if( !aVTrans ){
      return SQLITE_NOMEM_BKPT;
    }
    memset(&aVTrans[db->nVTrans], 0, sizeof(sqlite3_vtab *)*ARRAY_INCR);
    db->aVTrans = aVTrans;
  }

  return SQLITE_OK;
}
................................................................................
    return SQLITE_MISUSE_BKPT;
  }
  pTab = pCtx->pTab;
  assert( (pTab->tabFlags & TF_Virtual)!=0 );

  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
  if( pParse==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }else{
    pParse->declareVtab = 1;
    pParse->db = db;
    pParse->nQueryLoop = 1;
  
    if( SQLITE_OK==sqlite3RunParser(pParse, zCreateTable, &zErr) 
     && pParse->pNewTable
................................................................................
  ** function */
  pNew = sqlite3DbMallocZero(db, sizeof(*pNew)
                             + sqlite3Strlen30(pDef->zName) + 1);
  if( pNew==0 ){
    return pDef;
  }
  *pNew = *pDef;
  pNew->zName = (const char*)&pNew[1];
  memcpy((char*)&pNew[1], pDef->zName, sqlite3Strlen30(pDef->zName)+1);
  pNew->xSFunc = xSFunc;
  pNew->pUserData = pArg;
  pNew->funcFlags |= SQLITE_FUNC_EPHEM;
  return pNew;
}

/*

  /* Enlarge the pWal->apWiData[] array if required */
  if( pWal->nWiData<=iPage ){
    int nByte = sizeof(u32*)*(iPage+1);
    volatile u32 **apNew;
    apNew = (volatile u32 **)sqlite3_realloc64((void *)pWal->apWiData, nByte);
    if( !apNew ){
      *ppPage = 0;
      return SQLITE_NOMEM;
    }
    memset((void*)&apNew[pWal->nWiData], 0,
           sizeof(u32*)*(iPage+1-pWal->nWiData));
    pWal->apWiData = apNew;
    pWal->nWiData = iPage+1;
  }

  /* Request a pointer to the required page from the VFS */
  if( pWal->apWiData[iPage]==0 ){
    if( pWal->exclusiveMode==WAL_HEAPMEMORY_MODE ){
      pWal->apWiData[iPage] = (u32 volatile *)sqlite3MallocZero(WALINDEX_PGSZ);
      if( !pWal->apWiData[iPage] ) rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3OsShmMap(pWal->pDbFd, iPage, WALINDEX_PGSZ, 
          pWal->writeLock, (void volatile **)&pWal->apWiData[iPage]
      );
      if( rc==SQLITE_READONLY ){
        pWal->readOnly |= WAL_SHM_RDONLY;
        rc = SQLITE_OK;
................................................................................
      goto finished;
    }

    /* Malloc a buffer to read frames into. */
    szFrame = szPage + WAL_FRAME_HDRSIZE;
    aFrame = (u8 *)sqlite3_malloc64(szFrame);
    if( !aFrame ){
      rc = SQLITE_NOMEM;
      goto recovery_error;
    }
    aData = &aFrame[WAL_FRAME_HDRSIZE];

    /* Read all frames from the log file. */
    iFrame = 0;
    for(iOffset=WAL_HDRSIZE; (iOffset+szFrame)<=nSize; iOffset+=szFrame){
................................................................................
#endif


  /* Allocate an instance of struct Wal to return. */
  *ppWal = 0;
  pRet = (Wal*)sqlite3MallocZero(sizeof(Wal) + pVfs->szOsFile);
  if( !pRet ){
    return SQLITE_NOMEM;
  }

  pRet->pVfs = pVfs;
  pRet->pWalFd = (sqlite3_file *)&pRet[1];
  pRet->pDbFd = pDbFd;
  pRet->readLock = -1;
  pRet->mxWalSize = mxWalSize;
................................................................................
  /* Allocate space for the WalIterator object. */
  nSegment = walFramePage(iLast) + 1;
  nByte = sizeof(WalIterator) 
        + (nSegment-1)*sizeof(struct WalSegment)
        + iLast*sizeof(ht_slot);
  p = (WalIterator *)sqlite3_malloc64(nByte);
  if( !p ){
    return SQLITE_NOMEM;
  }
  memset(p, 0, nByte);
  p->nSegment = nSegment;

  /* Allocate temporary space used by the merge-sort routine. This block
  ** of memory will be freed before this function returns.
  */
  aTmp = (ht_slot *)sqlite3_malloc64(
      sizeof(ht_slot) * (iLast>HASHTABLE_NPAGE?HASHTABLE_NPAGE:iLast)
  );
  if( !aTmp ){
    rc = SQLITE_NOMEM;
  }

  for(i=0; rc==SQLITE_OK && i<nSegment; i++){
    volatile ht_slot *aHash;
    u32 iZero;
    volatile u32 *aPgno;

................................................................................
  int nTruncate,              /* The commit flag.  Usually 0.  >0 for commit */
  sqlite3_int64 iOffset       /* Byte offset at which to write */
){
  int rc;                         /* Result code from subfunctions */
  void *pData;                    /* Data actually written */
  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-header in */
#if defined(SQLITE_HAS_CODEC)
  if( (pData = sqlite3PagerCodec(pPage))==0 ) return SQLITE_NOMEM;
#else
  pData = pPage->pData;
#endif
  walEncodeFrame(p->pWal, pPage->pgno, nTruncate, pData, aFrame);
  rc = walWriteToLog(p, aFrame, sizeof(aFrame), iOffset);
  if( rc ) return rc;
  /* Write the page data */
................................................................................
  int rc = SQLITE_OK;             /* Return code */
  u8 *aBuf;                       /* Buffer to load data from wal file into */
  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-headers in */
  u32 iRead;                      /* Next frame to read from wal file */
  i64 iCksumOff;

  aBuf = sqlite3_malloc(szPage + WAL_FRAME_HDRSIZE);
  if( aBuf==0 ) return SQLITE_NOMEM;

  /* Find the checksum values to use as input for the recalculating the
  ** first checksum. If the first frame is frame 1 (implying that the current
  ** transaction restarted the wal file), these values must be read from the
  ** wal-file header. Otherwise, read them from the frame header of the
  ** previous frame.  */
  assert( pWal->iReCksum>0 );
................................................................................
  int rc = SQLITE_OK;
  WalIndexHdr *pRet;

  assert( pWal->readLock>=0 && pWal->writeLock==0 );

  pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr));
  if( pRet==0 ){
    rc = SQLITE_NOMEM;
  }else{
    memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr));
    *ppSnapshot = (sqlite3_snapshot*)pRet;
  }

  return rc;
}

  /* Enlarge the pWal->apWiData[] array if required */
  if( pWal->nWiData<=iPage ){
    int nByte = sizeof(u32*)*(iPage+1);
    volatile u32 **apNew;
    apNew = (volatile u32 **)sqlite3_realloc64((void *)pWal->apWiData, nByte);
    if( !apNew ){
      *ppPage = 0;
      return SQLITE_NOMEM_BKPT;
    }
    memset((void*)&apNew[pWal->nWiData], 0,
           sizeof(u32*)*(iPage+1-pWal->nWiData));
    pWal->apWiData = apNew;
    pWal->nWiData = iPage+1;
  }

  /* Request a pointer to the required page from the VFS */
  if( pWal->apWiData[iPage]==0 ){
    if( pWal->exclusiveMode==WAL_HEAPMEMORY_MODE ){
      pWal->apWiData[iPage] = (u32 volatile *)sqlite3MallocZero(WALINDEX_PGSZ);
      if( !pWal->apWiData[iPage] ) rc = SQLITE_NOMEM_BKPT;
    }else{
      rc = sqlite3OsShmMap(pWal->pDbFd, iPage, WALINDEX_PGSZ, 
          pWal->writeLock, (void volatile **)&pWal->apWiData[iPage]
      );
      if( rc==SQLITE_READONLY ){
        pWal->readOnly |= WAL_SHM_RDONLY;
        rc = SQLITE_OK;
................................................................................
      goto finished;
    }

    /* Malloc a buffer to read frames into. */
    szFrame = szPage + WAL_FRAME_HDRSIZE;
    aFrame = (u8 *)sqlite3_malloc64(szFrame);
    if( !aFrame ){
      rc = SQLITE_NOMEM_BKPT;
      goto recovery_error;
    }
    aData = &aFrame[WAL_FRAME_HDRSIZE];

    /* Read all frames from the log file. */
    iFrame = 0;
    for(iOffset=WAL_HDRSIZE; (iOffset+szFrame)<=nSize; iOffset+=szFrame){
................................................................................
#endif


  /* Allocate an instance of struct Wal to return. */
  *ppWal = 0;
  pRet = (Wal*)sqlite3MallocZero(sizeof(Wal) + pVfs->szOsFile);
  if( !pRet ){
    return SQLITE_NOMEM_BKPT;
  }

  pRet->pVfs = pVfs;
  pRet->pWalFd = (sqlite3_file *)&pRet[1];
  pRet->pDbFd = pDbFd;
  pRet->readLock = -1;
  pRet->mxWalSize = mxWalSize;
................................................................................
  /* Allocate space for the WalIterator object. */
  nSegment = walFramePage(iLast) + 1;
  nByte = sizeof(WalIterator) 
        + (nSegment-1)*sizeof(struct WalSegment)
        + iLast*sizeof(ht_slot);
  p = (WalIterator *)sqlite3_malloc64(nByte);
  if( !p ){
    return SQLITE_NOMEM_BKPT;
  }
  memset(p, 0, nByte);
  p->nSegment = nSegment;

  /* Allocate temporary space used by the merge-sort routine. This block
  ** of memory will be freed before this function returns.
  */
  aTmp = (ht_slot *)sqlite3_malloc64(
      sizeof(ht_slot) * (iLast>HASHTABLE_NPAGE?HASHTABLE_NPAGE:iLast)
  );
  if( !aTmp ){
    rc = SQLITE_NOMEM_BKPT;
  }

  for(i=0; rc==SQLITE_OK && i<nSegment; i++){
    volatile ht_slot *aHash;
    u32 iZero;
    volatile u32 *aPgno;

................................................................................
  int nTruncate,              /* The commit flag.  Usually 0.  >0 for commit */
  sqlite3_int64 iOffset       /* Byte offset at which to write */
){
  int rc;                         /* Result code from subfunctions */
  void *pData;                    /* Data actually written */
  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-header in */
#if defined(SQLITE_HAS_CODEC)
  if( (pData = sqlite3PagerCodec(pPage))==0 ) return SQLITE_NOMEM_BKPT;
#else
  pData = pPage->pData;
#endif
  walEncodeFrame(p->pWal, pPage->pgno, nTruncate, pData, aFrame);
  rc = walWriteToLog(p, aFrame, sizeof(aFrame), iOffset);
  if( rc ) return rc;
  /* Write the page data */
................................................................................
  int rc = SQLITE_OK;             /* Return code */
  u8 *aBuf;                       /* Buffer to load data from wal file into */
  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-headers in */
  u32 iRead;                      /* Next frame to read from wal file */
  i64 iCksumOff;

  aBuf = sqlite3_malloc(szPage + WAL_FRAME_HDRSIZE);
  if( aBuf==0 ) return SQLITE_NOMEM_BKPT;

  /* Find the checksum values to use as input for the recalculating the
  ** first checksum. If the first frame is frame 1 (implying that the current
  ** transaction restarted the wal file), these values must be read from the
  ** wal-file header. Otherwise, read them from the frame header of the
  ** previous frame.  */
  assert( pWal->iReCksum>0 );
................................................................................
  int rc = SQLITE_OK;
  WalIndexHdr *pRet;

  assert( pWal->readLock>=0 && pWal->writeLock==0 );

  pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr));
  if( pRet==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }else{
    memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr));
    *ppSnapshot = (sqlite3_snapshot*)pRet;
  }

  return rc;
}

/***/ int sqlite3WhereTrace = 0;
#endif


/*
** Return the estimated number of output rows from a WHERE clause
*/
u64 sqlite3WhereOutputRowCount(WhereInfo *pWInfo){
  return sqlite3LogEstToInt(pWInfo->nRowOut);
}

/*
** Return one of the WHERE_DISTINCT_xxxxx values to indicate how this
** WHERE clause returns outputs for DISTINCT processing.
*/
int sqlite3WhereIsDistinct(WhereInfo *pWInfo){
................................................................................
** Increase the memory allocation for pLoop->aLTerm[] to be at least n.
*/
static int whereLoopResize(sqlite3 *db, WhereLoop *p, int n){
  WhereTerm **paNew;
  if( p->nLSlot>=n ) return SQLITE_OK;
  n = (n+7)&~7;
  paNew = sqlite3DbMallocRawNN(db, sizeof(p->aLTerm[0])*n);
  if( paNew==0 ) return SQLITE_NOMEM;
  memcpy(paNew, p->aLTerm, sizeof(p->aLTerm[0])*p->nLSlot);
  if( p->aLTerm!=p->aLTermSpace ) sqlite3DbFree(db, p->aLTerm);
  p->aLTerm = paNew;
  p->nLSlot = n;
  return SQLITE_OK;
}

................................................................................
/*
** Transfer content from the second pLoop into the first.
*/
static int whereLoopXfer(sqlite3 *db, WhereLoop *pTo, WhereLoop *pFrom){
  whereLoopClearUnion(db, pTo);
  if( whereLoopResize(db, pTo, pFrom->nLTerm) ){
    memset(&pTo->u, 0, sizeof(pTo->u));
    return SQLITE_NOMEM;
  }
  memcpy(pTo, pFrom, WHERE_LOOP_XFER_SZ);
  memcpy(pTo->aLTerm, pFrom->aLTerm, pTo->nLTerm*sizeof(pTo->aLTerm[0]));
  if( pFrom->wsFlags & WHERE_VIRTUALTABLE ){
    pFrom->u.vtab.needFree = 0;
  }else if( (pFrom->wsFlags & WHERE_AUTO_INDEX)!=0 ){
    pFrom->u.btree.pIndex = 0;
................................................................................
    sqlite3DebugPrintf("    add: ");
    whereLoopPrint(pTemplate, pBuilder->pWC);
  }
#endif
  if( p==0 ){
    /* Allocate a new WhereLoop to add to the end of the list */
    *ppPrev = p = sqlite3DbMallocRawNN(db, sizeof(WhereLoop));
    if( p==0 ) return SQLITE_NOMEM;
    whereLoopInit(p);
    p->pNextLoop = 0;
  }else{
    /* We will be overwriting WhereLoop p[].  But before we do, first
    ** go through the rest of the list and delete any other entries besides
    ** p[] that are also supplated by pTemplate */
    WhereLoop **ppTail = &p->pNextLoop;
................................................................................
  LogEst saved_nOut;              /* Original value of pNew->nOut */
  int rc = SQLITE_OK;             /* Return code */
  LogEst rSize;                   /* Number of rows in the table */
  LogEst rLogSize;                /* Logarithm of table size */
  WhereTerm *pTop = 0, *pBtm = 0; /* Top and bottom range constraints */

  pNew = pBuilder->pNew;
  if( db->mallocFailed ) return SQLITE_NOMEM;

  assert( (pNew->wsFlags & WHERE_VIRTUALTABLE)==0 );
  assert( (pNew->wsFlags & WHERE_TOP_LIMIT)==0 );
  if( pNew->wsFlags & WHERE_BTM_LIMIT ){
    opMask = WO_LT|WO_LE;
  }else if( /*pProbe->tnum<=0 ||*/ (pSrc->fg.jointype & JT_LEFT)!=0 ){
    opMask = WO_EQ|WO_IN|WO_GT|WO_GE|WO_LT|WO_LE;
................................................................................
  db = pParse->db;
  pWC = pBuilder->pWC;
  pNew = pBuilder->pNew;
  pSrc = &pWInfo->pTabList->a[pNew->iTab];
  pTab = pSrc->pTab;
  assert( IsVirtual(pTab) );
  pIdxInfo = allocateIndexInfo(pParse, pWC, mUnusable, pSrc,pBuilder->pOrderBy);
  if( pIdxInfo==0 ) return SQLITE_NOMEM;
  pNew->prereq = 0;
  pNew->rSetup = 0;
  pNew->wsFlags = WHERE_VIRTUALTABLE;
  pNew->nLTerm = 0;
  pNew->u.vtab.needFree = 0;
  pUsage = pIdxInfo->aConstraintUsage;
  nConstraint = pIdxInfo->nConstraint;
  if( whereLoopResize(db, pNew, nConstraint) ){
    sqlite3DbFree(db, pIdxInfo);
    return SQLITE_NOMEM;
  }

  for(iPhase=0; iPhase<=3; iPhase++){
    if( !seenIn && (iPhase&1)!=0 ){
      iPhase++;
      if( iPhase>3 ) break;
    }
................................................................................

/*
** Return the cost of sorting nRow rows, assuming that the keys have 
** nOrderby columns and that the first nSorted columns are already in
** order.
*/
static LogEst whereSortingCost(

  LogEst nRow,
  int nOrderBy,
  int nSorted
){
  /* TUNING: Estimated cost of a full external sort, where N is 
  ** the number of rows to sort is:
  **
................................................................................
  **   cost = (3.0 * N * log(N)) * (Y/X)
  **
  ** The (Y/X) term is implemented using stack variable rScale
  ** below.  */
  LogEst rScale, rSortCost;
  assert( nOrderBy>0 && 66==sqlite3LogEst(100) );
  rScale = sqlite3LogEst((nOrderBy-nSorted)*100/nOrderBy) - 66;
  rSortCost = nRow + estLog(nRow) + rScale + 16;








  return rSortCost;
}

/*
** Given the list of WhereLoop objects at pWInfo->pLoops, this routine
** attempts to find the lowest cost path that visits each WhereLoop
** once.  This path is then loaded into the pWInfo->a[].pWLoop fields.
................................................................................
    nOrderBy = pWInfo->pOrderBy->nExpr;
  }

  /* Allocate and initialize space for aTo, aFrom and aSortCost[] */
  nSpace = (sizeof(WherePath)+sizeof(WhereLoop*)*nLoop)*mxChoice*2;
  nSpace += sizeof(LogEst) * nOrderBy;
  pSpace = sqlite3DbMallocRawNN(db, nSpace);
  if( pSpace==0 ) return SQLITE_NOMEM;
  aTo = (WherePath*)pSpace;
  aFrom = aTo+mxChoice;
  memset(aFrom, 0, sizeof(aFrom[0]));
  pX = (WhereLoop**)(aFrom+mxChoice);
  for(ii=mxChoice*2, pFrom=aTo; ii>0; ii--, pFrom++, pX += nLoop){
    pFrom->aLoop = pX;
  }
................................................................................
        LogEst rUnsorted;                 /* Unsorted cost of (pFrom+pWLoop) */
        i8 isOrdered = pFrom->isOrdered;  /* isOrdered for (pFrom+pWLoop) */
        Bitmask maskNew;                  /* Mask of src visited by (..) */
        Bitmask revMask = 0;              /* Mask of rev-order loops for (..) */

        if( (pWLoop->prereq & ~pFrom->maskLoop)!=0 ) continue;
        if( (pWLoop->maskSelf & pFrom->maskLoop)!=0 ) continue;






        /* At this point, pWLoop is a candidate to be the next loop. 
        ** Compute its cost */
        rUnsorted = sqlite3LogEstAdd(pWLoop->rSetup,pWLoop->rRun + pFrom->nRow);
        rUnsorted = sqlite3LogEstAdd(rUnsorted, pFrom->rUnsorted);
        nOut = pFrom->nRow + pWLoop->nOut;
        maskNew = pFrom->maskLoop | pWLoop->maskSelf;
        if( isOrdered<0 ){
................................................................................
                       iLoop, pWLoop, &revMask);
        }else{
          revMask = pFrom->revLoop;
        }
        if( isOrdered>=0 && isOrdered<nOrderBy ){
          if( aSortCost[isOrdered]==0 ){
            aSortCost[isOrdered] = whereSortingCost(
                nRowEst, nOrderBy, isOrdered
            );
          }
          rCost = sqlite3LogEstAdd(rUnsorted, aSortCost[isOrdered]);

          WHERETRACE(0x002,
              ("---- sort cost=%-3d (%d/%d) increases cost %3d to %-3d\n",
               aSortCost[isOrdered], (nOrderBy-isOrdered), nOrderBy, 
................................................................................
WhereInfo *sqlite3WhereBegin(
  Parse *pParse,        /* The parser context */
  SrcList *pTabList,    /* FROM clause: A list of all tables to be scanned */
  Expr *pWhere,         /* The WHERE clause */
  ExprList *pOrderBy,   /* An ORDER BY (or GROUP BY) clause, or NULL */
  ExprList *pResultSet, /* Result set of the query */
  u16 wctrlFlags,       /* One of the WHERE_* flags defined in sqliteInt.h */
  int iIdxCur           /* If WHERE_ONETABLE_ONLY is set, index cursor number */

){
  int nByteWInfo;            /* Num. bytes allocated for WhereInfo struct */
  int nTabList;              /* Number of elements in pTabList */
  WhereInfo *pWInfo;         /* Will become the return value of this function */
  Vdbe *v = pParse->pVdbe;   /* The virtual database engine */
  Bitmask notReady;          /* Cursors that are not yet positioned */
  WhereLoopBuilder sWLB;     /* The WhereLoop builder */
................................................................................
  int rc;                    /* Return code */
  u8 bFordelete = 0;         /* OPFLAG_FORDELETE or zero, as appropriate */

  assert( (wctrlFlags & WHERE_ONEPASS_MULTIROW)==0 || (
        (wctrlFlags & WHERE_ONEPASS_DESIRED)!=0 
     && (wctrlFlags & WHERE_OMIT_OPEN_CLOSE)==0 
  ));





  /* Variable initialization */
  db = pParse->db;
  memset(&sWLB, 0, sizeof(sWLB));

  /* An ORDER/GROUP BY clause of more than 63 terms cannot be optimized */
  testcase( pOrderBy && pOrderBy->nExpr==BMS-1 );
................................................................................
  pWInfo->nLevel = nTabList;
  pWInfo->pParse = pParse;
  pWInfo->pTabList = pTabList;
  pWInfo->pOrderBy = pOrderBy;
  pWInfo->pResultSet = pResultSet;
  pWInfo->iBreak = pWInfo->iContinue = sqlite3VdbeMakeLabel(v);
  pWInfo->wctrlFlags = wctrlFlags;

  pWInfo->savedNQueryLoop = pParse->nQueryLoop;
  assert( pWInfo->eOnePass==ONEPASS_OFF );  /* ONEPASS defaults to OFF */
  pMaskSet = &pWInfo->sMaskSet;
  sWLB.pWInfo = pWInfo;
  sWLB.pWC = &pWInfo->sWC;
  sWLB.pNew = (WhereLoop*)(((char*)pWInfo)+nByteWInfo);
  assert( EIGHT_BYTE_ALIGNMENT(sWLB.pNew) );
................................................................................
      /* Try to ORDER BY the result set to make distinct processing easier */
      pWInfo->wctrlFlags |= WHERE_DISTINCTBY;
      pWInfo->pOrderBy = pResultSet;
    }
  }

  /* Construct the WhereLoop objects */


  WHERETRACE(0xffff,("*** Optimizer Start *** (wctrlFlags: 0x%x)\n",
             wctrlFlags));
#if defined(WHERETRACE_ENABLED)




  if( sqlite3WhereTrace & 0x100 ){ /* Display all terms of the WHERE clause */
    int i;
    for(i=0; i<sWLB.pWC->nTerm; i++){
      whereTermPrint(&sWLB.pWC->a[i], i);
    }
  }
#endif
................................................................................
    }else{
      sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
    }
    if( pLoop->wsFlags & WHERE_INDEXED ){
      Index *pIx = pLoop->u.btree.pIndex;
      int iIndexCur;
      int op = OP_OpenRead;
      /* iIdxCur is always set if to a positive value if ONEPASS is possible */
      assert( iIdxCur!=0 || (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0 );
      if( !HasRowid(pTab) && IsPrimaryKeyIndex(pIx)
       && (wctrlFlags & WHERE_ONETABLE_ONLY)!=0
      ){
        /* This is one term of an OR-optimization using the PRIMARY KEY of a
        ** WITHOUT ROWID table.  No need for a separate index */
        iIndexCur = pLevel->iTabCur;
        op = 0;
      }else if( pWInfo->eOnePass!=ONEPASS_OFF ){
        Index *pJ = pTabItem->pTab->pIndex;
        iIndexCur = iIdxCur;
        assert( wctrlFlags & WHERE_ONEPASS_DESIRED );
        while( ALWAYS(pJ) && pJ!=pIx ){
          iIndexCur++;
          pJ = pJ->pNext;
        }
        op = OP_OpenWrite;
        pWInfo->aiCurOnePass[1] = iIndexCur;
      }else if( iIdxCur && (wctrlFlags & WHERE_ONETABLE_ONLY)!=0 ){
        iIndexCur = iIdxCur;
        if( wctrlFlags & WHERE_REOPEN_IDX ) op = OP_ReopenIdx;
      }else{
        iIndexCur = pParse->nTab++;
      }
      pLevel->iIdxCur = iIndexCur;
      assert( pIx->pSchema==pTab->pSchema );
      assert( iIndexCur>=0 );

/***/ int sqlite3WhereTrace = 0;
#endif


/*
** Return the estimated number of output rows from a WHERE clause
*/
LogEst sqlite3WhereOutputRowCount(WhereInfo *pWInfo){
  return pWInfo->nRowOut;
}

/*
** Return one of the WHERE_DISTINCT_xxxxx values to indicate how this
** WHERE clause returns outputs for DISTINCT processing.
*/
int sqlite3WhereIsDistinct(WhereInfo *pWInfo){
................................................................................
** Increase the memory allocation for pLoop->aLTerm[] to be at least n.
*/
static int whereLoopResize(sqlite3 *db, WhereLoop *p, int n){
  WhereTerm **paNew;
  if( p->nLSlot>=n ) return SQLITE_OK;
  n = (n+7)&~7;
  paNew = sqlite3DbMallocRawNN(db, sizeof(p->aLTerm[0])*n);
  if( paNew==0 ) return SQLITE_NOMEM_BKPT;
  memcpy(paNew, p->aLTerm, sizeof(p->aLTerm[0])*p->nLSlot);
  if( p->aLTerm!=p->aLTermSpace ) sqlite3DbFree(db, p->aLTerm);
  p->aLTerm = paNew;
  p->nLSlot = n;
  return SQLITE_OK;
}

................................................................................
/*
** Transfer content from the second pLoop into the first.
*/
static int whereLoopXfer(sqlite3 *db, WhereLoop *pTo, WhereLoop *pFrom){
  whereLoopClearUnion(db, pTo);
  if( whereLoopResize(db, pTo, pFrom->nLTerm) ){
    memset(&pTo->u, 0, sizeof(pTo->u));
    return SQLITE_NOMEM_BKPT;
  }
  memcpy(pTo, pFrom, WHERE_LOOP_XFER_SZ);
  memcpy(pTo->aLTerm, pFrom->aLTerm, pTo->nLTerm*sizeof(pTo->aLTerm[0]));
  if( pFrom->wsFlags & WHERE_VIRTUALTABLE ){
    pFrom->u.vtab.needFree = 0;
  }else if( (pFrom->wsFlags & WHERE_AUTO_INDEX)!=0 ){
    pFrom->u.btree.pIndex = 0;
................................................................................
    sqlite3DebugPrintf("    add: ");
    whereLoopPrint(pTemplate, pBuilder->pWC);
  }
#endif
  if( p==0 ){
    /* Allocate a new WhereLoop to add to the end of the list */
    *ppPrev = p = sqlite3DbMallocRawNN(db, sizeof(WhereLoop));
    if( p==0 ) return SQLITE_NOMEM_BKPT;
    whereLoopInit(p);
    p->pNextLoop = 0;
  }else{
    /* We will be overwriting WhereLoop p[].  But before we do, first
    ** go through the rest of the list and delete any other entries besides
    ** p[] that are also supplated by pTemplate */
    WhereLoop **ppTail = &p->pNextLoop;
................................................................................
  LogEst saved_nOut;              /* Original value of pNew->nOut */
  int rc = SQLITE_OK;             /* Return code */
  LogEst rSize;                   /* Number of rows in the table */
  LogEst rLogSize;                /* Logarithm of table size */
  WhereTerm *pTop = 0, *pBtm = 0; /* Top and bottom range constraints */

  pNew = pBuilder->pNew;
  if( db->mallocFailed ) return SQLITE_NOMEM_BKPT;

  assert( (pNew->wsFlags & WHERE_VIRTUALTABLE)==0 );
  assert( (pNew->wsFlags & WHERE_TOP_LIMIT)==0 );
  if( pNew->wsFlags & WHERE_BTM_LIMIT ){
    opMask = WO_LT|WO_LE;
  }else if( /*pProbe->tnum<=0 ||*/ (pSrc->fg.jointype & JT_LEFT)!=0 ){
    opMask = WO_EQ|WO_IN|WO_GT|WO_GE|WO_LT|WO_LE;
................................................................................
  db = pParse->db;
  pWC = pBuilder->pWC;
  pNew = pBuilder->pNew;
  pSrc = &pWInfo->pTabList->a[pNew->iTab];
  pTab = pSrc->pTab;
  assert( IsVirtual(pTab) );
  pIdxInfo = allocateIndexInfo(pParse, pWC, mUnusable, pSrc,pBuilder->pOrderBy);
  if( pIdxInfo==0 ) return SQLITE_NOMEM_BKPT;
  pNew->prereq = 0;
  pNew->rSetup = 0;
  pNew->wsFlags = WHERE_VIRTUALTABLE;
  pNew->nLTerm = 0;
  pNew->u.vtab.needFree = 0;
  pUsage = pIdxInfo->aConstraintUsage;
  nConstraint = pIdxInfo->nConstraint;
  if( whereLoopResize(db, pNew, nConstraint) ){
    sqlite3DbFree(db, pIdxInfo);
    return SQLITE_NOMEM_BKPT;
  }

  for(iPhase=0; iPhase<=3; iPhase++){
    if( !seenIn && (iPhase&1)!=0 ){
      iPhase++;
      if( iPhase>3 ) break;
    }
................................................................................

/*
** Return the cost of sorting nRow rows, assuming that the keys have 
** nOrderby columns and that the first nSorted columns are already in
** order.
*/
static LogEst whereSortingCost(
  WhereInfo *pWInfo,
  LogEst nRow,
  int nOrderBy,
  int nSorted
){
  /* TUNING: Estimated cost of a full external sort, where N is 
  ** the number of rows to sort is:
  **
................................................................................
  **   cost = (3.0 * N * log(N)) * (Y/X)
  **
  ** The (Y/X) term is implemented using stack variable rScale
  ** below.  */
  LogEst rScale, rSortCost;
  assert( nOrderBy>0 && 66==sqlite3LogEst(100) );
  rScale = sqlite3LogEst((nOrderBy-nSorted)*100/nOrderBy) - 66;
  rSortCost = nRow + rScale + 16;

  /* Multiple by log(M) where M is the number of output rows.
  ** Use the LIMIT for M if it is smaller */
  if( (pWInfo->wctrlFlags & WHERE_USE_LIMIT)!=0 ){
    LogEst m = sqlite3LogEst(pWInfo->iLimit);
    if( m<nRow ) nRow = m;
  }
  rSortCost += estLog(nRow);
  return rSortCost;
}

/*
** Given the list of WhereLoop objects at pWInfo->pLoops, this routine
** attempts to find the lowest cost path that visits each WhereLoop
** once.  This path is then loaded into the pWInfo->a[].pWLoop fields.
................................................................................
    nOrderBy = pWInfo->pOrderBy->nExpr;
  }

  /* Allocate and initialize space for aTo, aFrom and aSortCost[] */
  nSpace = (sizeof(WherePath)+sizeof(WhereLoop*)*nLoop)*mxChoice*2;
  nSpace += sizeof(LogEst) * nOrderBy;
  pSpace = sqlite3DbMallocRawNN(db, nSpace);
  if( pSpace==0 ) return SQLITE_NOMEM_BKPT;
  aTo = (WherePath*)pSpace;
  aFrom = aTo+mxChoice;
  memset(aFrom, 0, sizeof(aFrom[0]));
  pX = (WhereLoop**)(aFrom+mxChoice);
  for(ii=mxChoice*2, pFrom=aTo; ii>0; ii--, pFrom++, pX += nLoop){
    pFrom->aLoop = pX;
  }
................................................................................
        LogEst rUnsorted;                 /* Unsorted cost of (pFrom+pWLoop) */
        i8 isOrdered = pFrom->isOrdered;  /* isOrdered for (pFrom+pWLoop) */
        Bitmask maskNew;                  /* Mask of src visited by (..) */
        Bitmask revMask = 0;              /* Mask of rev-order loops for (..) */

        if( (pWLoop->prereq & ~pFrom->maskLoop)!=0 ) continue;
        if( (pWLoop->maskSelf & pFrom->maskLoop)!=0 ) continue;
        if( (pWLoop->wsFlags & WHERE_AUTO_INDEX)!=0 && pFrom->nRow<10 ){
          /* Do not use an automatic index if the this loop is expected
          ** to run less than 2 times. */
          assert( 10==sqlite3LogEst(2) );
          continue;
        }
        /* At this point, pWLoop is a candidate to be the next loop. 
        ** Compute its cost */
        rUnsorted = sqlite3LogEstAdd(pWLoop->rSetup,pWLoop->rRun + pFrom->nRow);
        rUnsorted = sqlite3LogEstAdd(rUnsorted, pFrom->rUnsorted);
        nOut = pFrom->nRow + pWLoop->nOut;
        maskNew = pFrom->maskLoop | pWLoop->maskSelf;
        if( isOrdered<0 ){
................................................................................
                       iLoop, pWLoop, &revMask);
        }else{
          revMask = pFrom->revLoop;
        }
        if( isOrdered>=0 && isOrdered<nOrderBy ){
          if( aSortCost[isOrdered]==0 ){
            aSortCost[isOrdered] = whereSortingCost(
                pWInfo, nRowEst, nOrderBy, isOrdered
            );
          }
          rCost = sqlite3LogEstAdd(rUnsorted, aSortCost[isOrdered]);

          WHERETRACE(0x002,
              ("---- sort cost=%-3d (%d/%d) increases cost %3d to %-3d\n",
               aSortCost[isOrdered], (nOrderBy-isOrdered), nOrderBy, 
................................................................................
WhereInfo *sqlite3WhereBegin(
  Parse *pParse,        /* The parser context */
  SrcList *pTabList,    /* FROM clause: A list of all tables to be scanned */
  Expr *pWhere,         /* The WHERE clause */
  ExprList *pOrderBy,   /* An ORDER BY (or GROUP BY) clause, or NULL */
  ExprList *pResultSet, /* Result set of the query */
  u16 wctrlFlags,       /* One of the WHERE_* flags defined in sqliteInt.h */
  int iAuxArg           /* If WHERE_ONETABLE_ONLY is set, index cursor number,
                        ** If WHERE_USE_LIMIT, then the limit amount */
){
  int nByteWInfo;            /* Num. bytes allocated for WhereInfo struct */
  int nTabList;              /* Number of elements in pTabList */
  WhereInfo *pWInfo;         /* Will become the return value of this function */
  Vdbe *v = pParse->pVdbe;   /* The virtual database engine */
  Bitmask notReady;          /* Cursors that are not yet positioned */
  WhereLoopBuilder sWLB;     /* The WhereLoop builder */
................................................................................
  int rc;                    /* Return code */
  u8 bFordelete = 0;         /* OPFLAG_FORDELETE or zero, as appropriate */

  assert( (wctrlFlags & WHERE_ONEPASS_MULTIROW)==0 || (
        (wctrlFlags & WHERE_ONEPASS_DESIRED)!=0 
     && (wctrlFlags & WHERE_OMIT_OPEN_CLOSE)==0 
  ));

  /* Only one of WHERE_ONETABLE_ONLY or WHERE_USE_LIMIT */
  assert( (wctrlFlags & WHERE_ONETABLE_ONLY)==0
            || (wctrlFlags & WHERE_USE_LIMIT)==0 );

  /* Variable initialization */
  db = pParse->db;
  memset(&sWLB, 0, sizeof(sWLB));

  /* An ORDER/GROUP BY clause of more than 63 terms cannot be optimized */
  testcase( pOrderBy && pOrderBy->nExpr==BMS-1 );
................................................................................
  pWInfo->nLevel = nTabList;
  pWInfo->pParse = pParse;
  pWInfo->pTabList = pTabList;
  pWInfo->pOrderBy = pOrderBy;
  pWInfo->pResultSet = pResultSet;
  pWInfo->iBreak = pWInfo->iContinue = sqlite3VdbeMakeLabel(v);
  pWInfo->wctrlFlags = wctrlFlags;
  pWInfo->iLimit = iAuxArg;
  pWInfo->savedNQueryLoop = pParse->nQueryLoop;
  assert( pWInfo->eOnePass==ONEPASS_OFF );  /* ONEPASS defaults to OFF */
  pMaskSet = &pWInfo->sMaskSet;
  sWLB.pWInfo = pWInfo;
  sWLB.pWC = &pWInfo->sWC;
  sWLB.pNew = (WhereLoop*)(((char*)pWInfo)+nByteWInfo);
  assert( EIGHT_BYTE_ALIGNMENT(sWLB.pNew) );
................................................................................
      /* Try to ORDER BY the result set to make distinct processing easier */
      pWInfo->wctrlFlags |= WHERE_DISTINCTBY;
      pWInfo->pOrderBy = pResultSet;
    }
  }

  /* Construct the WhereLoop objects */
#if defined(WHERETRACE_ENABLED)
  if( sqlite3WhereTrace & 0xffff ){
    sqlite3DebugPrintf("*** Optimizer Start *** (wctrlFlags: 0x%x",wctrlFlags);
    if( wctrlFlags & WHERE_USE_LIMIT ){

      sqlite3DebugPrintf(", limit: %d", iAuxArg);
    }
    sqlite3DebugPrintf(")\n");
  }
  if( sqlite3WhereTrace & 0x100 ){ /* Display all terms of the WHERE clause */
    int i;
    for(i=0; i<sWLB.pWC->nTerm; i++){
      whereTermPrint(&sWLB.pWC->a[i], i);
    }
  }
#endif
................................................................................
    }else{
      sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
    }
    if( pLoop->wsFlags & WHERE_INDEXED ){
      Index *pIx = pLoop->u.btree.pIndex;
      int iIndexCur;
      int op = OP_OpenRead;
      /* iAuxArg is always set if to a positive value if ONEPASS is possible */
      assert( iAuxArg!=0 || (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0 );
      if( !HasRowid(pTab) && IsPrimaryKeyIndex(pIx)
       && (wctrlFlags & WHERE_ONETABLE_ONLY)!=0
      ){
        /* This is one term of an OR-optimization using the PRIMARY KEY of a
        ** WITHOUT ROWID table.  No need for a separate index */
        iIndexCur = pLevel->iTabCur;
        op = 0;
      }else if( pWInfo->eOnePass!=ONEPASS_OFF ){
        Index *pJ = pTabItem->pTab->pIndex;
        iIndexCur = iAuxArg;
        assert( wctrlFlags & WHERE_ONEPASS_DESIRED );
        while( ALWAYS(pJ) && pJ!=pIx ){
          iIndexCur++;
          pJ = pJ->pNext;
        }
        op = OP_OpenWrite;
        pWInfo->aiCurOnePass[1] = iIndexCur;
      }else if( iAuxArg && (wctrlFlags & WHERE_ONETABLE_ONLY)!=0 ){
        iIndexCur = iAuxArg;
        if( wctrlFlags & WHERE_REOPEN_IDX ) op = OP_ReopenIdx;
      }else{
        iIndexCur = pParse->nTab++;
      }
      pLevel->iIdxCur = iIndexCur;
      assert( pIx->pSchema==pTab->pSchema );
      assert( iIndexCur>=0 );

  Parse *pParse;            /* Parsing and code generating context */
  SrcList *pTabList;        /* List of tables in the join */
  ExprList *pOrderBy;       /* The ORDER BY clause or NULL */
  ExprList *pResultSet;     /* Result set. DISTINCT operates on these */
  WhereLoop *pLoops;        /* List of all WhereLoop objects */
  Bitmask revMask;          /* Mask of ORDER BY terms that need reversing */
  LogEst nRowOut;           /* Estimated number of output rows */

  u16 wctrlFlags;           /* Flags originally passed to sqlite3WhereBegin() */
  i8 nOBSat;                /* Number of ORDER BY terms satisfied by indices */
  u8 sorted;                /* True if really sorted (not just grouped) */
  u8 eOnePass;              /* ONEPASS_OFF, or _SINGLE, or _MULTI */
  u8 untestedTerms;         /* Not all WHERE terms resolved by outer loop */
  u8 eDistinct;             /* One of the WHERE_DISTINCT_* values below */
  u8 nLevel;                /* Number of nested loop */

  Parse *pParse;            /* Parsing and code generating context */
  SrcList *pTabList;        /* List of tables in the join */
  ExprList *pOrderBy;       /* The ORDER BY clause or NULL */
  ExprList *pResultSet;     /* Result set. DISTINCT operates on these */
  WhereLoop *pLoops;        /* List of all WhereLoop objects */
  Bitmask revMask;          /* Mask of ORDER BY terms that need reversing */
  LogEst nRowOut;           /* Estimated number of output rows */
  LogEst iLimit;            /* LIMIT if wctrlFlags has WHERE_USE_LIMIT */
  u16 wctrlFlags;           /* Flags originally passed to sqlite3WhereBegin() */
  i8 nOBSat;                /* Number of ORDER BY terms satisfied by indices */
  u8 sorted;                /* True if really sorted (not just grouped) */
  u8 eOnePass;              /* ONEPASS_OFF, or _SINGLE, or _MULTI */
  u8 untestedTerms;         /* Not all WHERE terms resolved by outer loop */
  u8 eDistinct;             /* One of the WHERE_DISTINCT_* values below */
  u8 nLevel;                /* Number of nested loop */

    }else if( bSeekPastNull ){
      sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nEq);
      nConstraint++;
      startEq = 0;
      start_constraints = 1;
    }
    codeApplyAffinity(pParse, regBase, nConstraint - bSeekPastNull, zStartAff);





    op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
    assert( op!=0 );
    sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
    VdbeCoverage(v);
    VdbeCoverageIf(v, op==OP_Rewind);  testcase( op==OP_Rewind );
    VdbeCoverageIf(v, op==OP_Last);    testcase( op==OP_Last );
    VdbeCoverageIf(v, op==OP_SeekGT);  testcase( op==OP_SeekGT );
    VdbeCoverageIf(v, op==OP_SeekGE);  testcase( op==OP_SeekGE );
    VdbeCoverageIf(v, op==OP_SeekLE);  testcase( op==OP_SeekLE );
    VdbeCoverageIf(v, op==OP_SeekLT);  testcase( op==OP_SeekLT );


    /* Load the value for the inequality constraint at the end of the
    ** range (if any).
    */
    nConstraint = nEq;
    if( pRangeEnd ){
      Expr *pRight = pRangeEnd->pExpr->pRight;

    }else if( bSeekPastNull ){
      sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nEq);
      nConstraint++;
      startEq = 0;
      start_constraints = 1;
    }
    codeApplyAffinity(pParse, regBase, nConstraint - bSeekPastNull, zStartAff);
    if( pLoop->nSkip>0 && nConstraint==pLoop->nSkip ){
      /* The skip-scan logic inside the call to codeAllEqualityConstraints()
      ** above has already left the cursor sitting on the correct row,
      ** so no further seeking is needed */
    }else{
      op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
      assert( op!=0 );
      sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
      VdbeCoverage(v);
      VdbeCoverageIf(v, op==OP_Rewind);  testcase( op==OP_Rewind );
      VdbeCoverageIf(v, op==OP_Last);    testcase( op==OP_Last );
      VdbeCoverageIf(v, op==OP_SeekGT);  testcase( op==OP_SeekGT );
      VdbeCoverageIf(v, op==OP_SeekGE);  testcase( op==OP_SeekGE );
      VdbeCoverageIf(v, op==OP_SeekLE);  testcase( op==OP_SeekLE );
      VdbeCoverageIf(v, op==OP_SeekLT);  testcase( op==OP_SeekLT );
    }

    /* Load the value for the inequality constraint at the end of the
    ** range (if any).
    */
    nConstraint = nEq;
    if( pRangeEnd ){
      Expr *pRight = pRangeEnd->pExpr->pRight;

  */
  assert( (pTerm->wtFlags & (TERM_DYNAMIC|TERM_ORINFO|TERM_ANDINFO))==0 );
  assert( pExpr->op==TK_OR );
  pTerm->u.pOrInfo = pOrInfo = sqlite3DbMallocZero(db, sizeof(*pOrInfo));
  if( pOrInfo==0 ) return;
  pTerm->wtFlags |= TERM_ORINFO;
  pOrWc = &pOrInfo->wc;

  sqlite3WhereClauseInit(pOrWc, pWInfo);
  sqlite3WhereSplit(pOrWc, pExpr, TK_OR);
  sqlite3WhereExprAnalyze(pSrc, pOrWc);
  if( db->mallocFailed ) return;
  assert( pOrWc->nTerm>=2 );

  /*
................................................................................
        WhereTerm *pAndTerm;
        int j;
        Bitmask b = 0;
        pOrTerm->u.pAndInfo = pAndInfo;
        pOrTerm->wtFlags |= TERM_ANDINFO;
        pOrTerm->eOperator = WO_AND;
        pAndWC = &pAndInfo->wc;

        sqlite3WhereClauseInit(pAndWC, pWC->pWInfo);
        sqlite3WhereSplit(pAndWC, pOrTerm->pExpr, TK_AND);
        sqlite3WhereExprAnalyze(pSrc, pAndWC);
        pAndWC->pOuter = pWC;
        if( !db->mallocFailed ){
          for(j=0, pAndTerm=pAndWC->a; j<pAndWC->nTerm; j++, pAndTerm++){
            assert( pAndTerm->pExpr );

  */
  assert( (pTerm->wtFlags & (TERM_DYNAMIC|TERM_ORINFO|TERM_ANDINFO))==0 );
  assert( pExpr->op==TK_OR );
  pTerm->u.pOrInfo = pOrInfo = sqlite3DbMallocZero(db, sizeof(*pOrInfo));
  if( pOrInfo==0 ) return;
  pTerm->wtFlags |= TERM_ORINFO;
  pOrWc = &pOrInfo->wc;
  memset(pOrWc->aStatic, 0, sizeof(pOrWc->aStatic));
  sqlite3WhereClauseInit(pOrWc, pWInfo);
  sqlite3WhereSplit(pOrWc, pExpr, TK_OR);
  sqlite3WhereExprAnalyze(pSrc, pOrWc);
  if( db->mallocFailed ) return;
  assert( pOrWc->nTerm>=2 );

  /*
................................................................................
        WhereTerm *pAndTerm;
        int j;
        Bitmask b = 0;
        pOrTerm->u.pAndInfo = pAndInfo;
        pOrTerm->wtFlags |= TERM_ANDINFO;
        pOrTerm->eOperator = WO_AND;
        pAndWC = &pAndInfo->wc;
        memset(pAndWC->aStatic, 0, sizeof(pAndWC->aStatic));
        sqlite3WhereClauseInit(pAndWC, pWC->pWInfo);
        sqlite3WhereSplit(pAndWC, pOrTerm->pExpr, TK_AND);
        sqlite3WhereExprAnalyze(pSrc, pAndWC);
        pAndWC->pOuter = pWC;
        if( !db->mallocFailed ){
          for(j=0, pAndTerm=pAndWC->a; j<pAndWC->nTerm; j++, pAndTerm++){
            assert( pAndTerm->pExpr );

  WHERE
     t1.ptime > 1393520400
     AND param3<>9001
     AND t3.flg7 = 1
     AND t1.did = t2.did
     AND t2.uid = t3.uid
  ORDER BY t1.ptime desc LIMIT 500;
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1x1 (ptime>?)} 0 1 1 {SEARCH TABLE t2 USING INDEX t2x0 (did=?)} 0 2 2 {SEARCH TABLE t3 USING INDEX t3x0 (uid=?)}}
#
# ^^^--- Before being fixed, the above was using an automatic covering
# on t3 and reordering the tables so that t3 was in the outer loop and
# implementing the ORDER BY clause using a B-Tree.






finish_test

  WHERE
     t1.ptime > 1393520400
     AND param3<>9001
     AND t3.flg7 = 1
     AND t1.did = t2.did
     AND t2.uid = t3.uid
  ORDER BY t1.ptime desc LIMIT 500;
} {~/AUTO/}
#
# ^^^--- Before being fixed, the above was using an automatic covering
# on t3 and reordering the tables so that t3 was in the outer loop and
# implementing the ORDER BY clause using a B-Tree.
#
# This test is sanitized data received from a user.  The original unsanitized
# data and STAT4 data is found in the th3private test repository.  See one of
# the th3private check-ins on 2016-02-25.  The test is much more accurate when
# STAT4 data is used.

finish_test

} {3 4 5}
do_test 4.2 {
  db eval {SELECT a, c FROM t1}
} {5 3 4 2 3 1}
do_test 4.3 {
  db eval {SELECT b FROM t1}
} {2 4 8}

































finish_test

} {3 4 5}
do_test 4.2 {
  db eval {SELECT a, c FROM t1}
} {5 3 4 2 3 1}
do_test 4.3 {
  db eval {SELECT b FROM t1}
} {2 4 8}

#-------------------------------------------------------------------------
# Test that indexes with large numbers of columns can be correctly 
# identified as covering indexes.
reset_db
set L [list]
for {set i 1} {$i<120} {incr i} {
  lappend L "c$i"
}
set cols [join $L ,]

do_execsql_test 5.1.0 "
  CREATE TABLE t1(a, b, c, $cols, PRIMARY KEY(a, b, c)) WITHOUT ROWID;
  CREATE INDEX i1 ON t1($cols);

  CREATE TABLE t2(i INTEGER PRIMARY KEY, $cols);
  CREATE INDEX i2 ON t2($cols);
"

do_eqp_test 5.1.1 {
  SELECT * FROM t1 ORDER BY c1, c2;
} {
  0 0 0 {SCAN TABLE t1 USING COVERING INDEX i1}
}

do_eqp_test 5.1.2 {
  SELECT * FROM t2 ORDER BY c1, c2;
} {
  0 0 0 {SCAN TABLE t2 USING COVERING INDEX i2}
}



finish_test

*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include "sqlite3.h"

#define ISSPACE(X) isspace((unsigned char)(X))
#define ISDIGIT(X) isdigit((unsigned char)(X))


#ifdef __unix__
# include <signal.h>
# include <unistd.h>
................................................................................
  VFile *pNew = findVFile(zName);
  int i;
  if( pNew ) return pNew;
  for(i=0; i<MX_FILE && g.aFile[i].sz>=0; i++){}
  if( i>=MX_FILE ) return 0;
  pNew = &g.aFile[i];
  if( zName ){

    pNew->zFilename = safe_realloc(0, strlen(zName)+1);
    memcpy(pNew->zFilename, zName, strlen(zName)+1);
  }else{
    pNew->zFilename = 0;
  }
  pNew->nRef = 0;
  pNew->sz = sz;
  pNew->a = safe_realloc(0, sz);
  if( sz>0 ) memcpy(pNew->a, pData, sz);
................................................................................

/*
** Run multiple commands of SQL.  Similar to sqlite3_exec(), but does not
** stop if an error is encountered.
*/
static void runSql(sqlite3 *db, const char *zSql, unsigned  runFlags){
  const char *zMore;

  sqlite3_stmt *pStmt;

  while( zSql && zSql[0] ){
    zMore = 0;
    pStmt = 0;
    sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zMore);

    if( zMore==zSql ) break;
    if( runFlags & SQL_TRACE ){
      const char *z = zSql;
      int n;
      while( z<zMore && ISSPACE(z[0]) ) z++;
      n = (int)(zMore - z);
      while( n>0 && ISSPACE(z[n-1]) ) n--;
................................................................................
"each database, checking for crashes and memory leaks.\n"
"Options:\n"
"  --cell-size-check     Set the PRAGMA cell_size_check=ON\n"
"  --dbid N              Use only the database where dbid=N\n"
"  --export-db DIR       Write databases to files(s) in DIR. Works with --dbid\n"
"  --export-sql DIR      Write SQL to file(s) in DIR. Also works with --sqlid\n"
"  --help                Show this help text\n"
"  -q                    Reduced output\n"
"  --quiet               Reduced output\n"
"  --limit-mem N         Limit memory used by test SQLite instance to N bytes\n"
"  --limit-vdbe          Panic if an sync SQL runs for more than 100,000 cycles\n"
"  --load-sql ARGS...    Load SQL scripts fro files into SOURCE-DB\n"
"  --load-db ARGS...     Load template databases from files into SOURCE_DB\n"
"  -m TEXT               Add a description to the database\n"
"  --native-vfs          Use the native VFS for initially empty database files\n"
"  --rebuild             Rebuild and vacuum the database file\n"
"  --result-trace        Show the results of each SQL command\n"
"  --sqlid N             Use only SQL where sqlid=N\n"
"  --timeout N           Abort if any single test case needs more than N seconds\n"
"  -v                    Increased output\n"
"  --verbose             Increased output\n"
  );
}

int main(int argc, char **argv){
  sqlite3_int64 iBegin;        /* Start time of this program */
  int quietFlag = 0;           /* True if --quiet or -q */
  int verboseFlag = 0;         /* True if --verbose or -v */
................................................................................
        timeoutTest = 1;
#ifndef __unix__
        fatalError("timeout is not available on non-unix systems");
#endif
      }else
      if( strcmp(z,"verbose")==0 || strcmp(z,"v")==0 ){
        quietFlag = 0;
        verboseFlag = 1;
        runFlags |= SQL_TRACE;
      }else
      {
        fatalError("unknown option: %s", argv[i]);
      }
    }else{
      nSrcDb++;
      azSrcDb = safe_realloc(azSrcDb, nSrcDb*sizeof(azSrcDb[0]));
................................................................................
      g.nDb = 1;
      sqlFuzz = 1;
    }
  
    /* Print the description, if there is one */
    if( !quietFlag ){
      zDbName = azSrcDb[iSrcDb];
      i = strlen(zDbName) - 1;
      while( i>0 && zDbName[i-1]!='/' && zDbName[i-1]!='\\' ){ i--; }
      zDbName += i;
      sqlite3_prepare_v2(db, "SELECT msg FROM readme", -1, &pStmt, 0);
      if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
        printf("%s: %s\n", zDbName, sqlite3_column_text(pStmt,0));
      }
      sqlite3_finalize(pStmt);

*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include "sqlite3.h"
#include <assert.h>
#define ISSPACE(X) isspace((unsigned char)(X))
#define ISDIGIT(X) isdigit((unsigned char)(X))


#ifdef __unix__
# include <signal.h>
# include <unistd.h>
................................................................................
  VFile *pNew = findVFile(zName);
  int i;
  if( pNew ) return pNew;
  for(i=0; i<MX_FILE && g.aFile[i].sz>=0; i++){}
  if( i>=MX_FILE ) return 0;
  pNew = &g.aFile[i];
  if( zName ){
    int nName = (int)strlen(zName)+1;
    pNew->zFilename = safe_realloc(0, nName);
    memcpy(pNew->zFilename, zName, nName);
  }else{
    pNew->zFilename = 0;
  }
  pNew->nRef = 0;
  pNew->sz = sz;
  pNew->a = safe_realloc(0, sz);
  if( sz>0 ) memcpy(pNew->a, pData, sz);
................................................................................

/*
** Run multiple commands of SQL.  Similar to sqlite3_exec(), but does not
** stop if an error is encountered.
*/
static void runSql(sqlite3 *db, const char *zSql, unsigned  runFlags){
  const char *zMore;
  const char *zEnd = &zSql[strlen(zSql)];
  sqlite3_stmt *pStmt;

  while( zSql && zSql[0] ){
    zMore = 0;
    pStmt = 0;
    sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zMore);
    assert( zMore<=zEnd );
    if( zMore==zSql ) break;
    if( runFlags & SQL_TRACE ){
      const char *z = zSql;
      int n;
      while( z<zMore && ISSPACE(z[0]) ) z++;
      n = (int)(zMore - z);
      while( n>0 && ISSPACE(z[n-1]) ) n--;
................................................................................
"each database, checking for crashes and memory leaks.\n"
"Options:\n"
"  --cell-size-check     Set the PRAGMA cell_size_check=ON\n"
"  --dbid N              Use only the database where dbid=N\n"
"  --export-db DIR       Write databases to files(s) in DIR. Works with --dbid\n"
"  --export-sql DIR      Write SQL to file(s) in DIR. Also works with --sqlid\n"
"  --help                Show this help text\n"
"  -q|--quiet            Reduced output\n"

"  --limit-mem N         Limit memory used by test SQLite instance to N bytes\n"
"  --limit-vdbe          Panic if an sync SQL runs for more than 100,000 cycles\n"
"  --load-sql ARGS...    Load SQL scripts fro files into SOURCE-DB\n"
"  --load-db ARGS...     Load template databases from files into SOURCE_DB\n"
"  -m TEXT               Add a description to the database\n"
"  --native-vfs          Use the native VFS for initially empty database files\n"
"  --rebuild             Rebuild and vacuum the database file\n"
"  --result-trace        Show the results of each SQL command\n"
"  --sqlid N             Use only SQL where sqlid=N\n"
"  --timeout N           Abort if any single test case needs more than N seconds\n"
"  -v|--verbose          Increased output.  Repeat for more output.\n"

  );
}

int main(int argc, char **argv){
  sqlite3_int64 iBegin;        /* Start time of this program */
  int quietFlag = 0;           /* True if --quiet or -q */
  int verboseFlag = 0;         /* True if --verbose or -v */
................................................................................
        timeoutTest = 1;
#ifndef __unix__
        fatalError("timeout is not available on non-unix systems");
#endif
      }else
      if( strcmp(z,"verbose")==0 || strcmp(z,"v")==0 ){
        quietFlag = 0;
        verboseFlag++;
        if( verboseFlag>1 ) runFlags |= SQL_TRACE;
      }else
      {
        fatalError("unknown option: %s", argv[i]);
      }
    }else{
      nSrcDb++;
      azSrcDb = safe_realloc(azSrcDb, nSrcDb*sizeof(azSrcDb[0]));
................................................................................
      g.nDb = 1;
      sqlFuzz = 1;
    }
  
    /* Print the description, if there is one */
    if( !quietFlag ){
      zDbName = azSrcDb[iSrcDb];
      i = (int)strlen(zDbName) - 1;
      while( i>0 && zDbName[i-1]!='/' && zDbName[i-1]!='\\' ){ i--; }
      zDbName += i;
      sqlite3_prepare_v2(db, "SELECT msg FROM readme", -1, &pStmt, 0);
      if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
        printf("%s: %s\n", zDbName, sqlite3_column_text(pStmt,0));
      }
      sqlite3_finalize(pStmt);

do_test main-3.1 {
  catch {db close}
  foreach f [glob -nocomplain testdb/*] {forcedelete $f}
  forcedelete testdb
  sqlite3 db testdb
  set v [catch {execsql {SELECT * from T1 where x!!5}} msg]
  lappend v $msg
} {1 {unrecognized token: "!!"}}
do_test main-3.2 {
  catch {db close}
  foreach f [glob -nocomplain testdb/*] {forcedelete $f}
  forcedelete testdb
  sqlite3 db testdb
  set v [catch {execsql {SELECT * from T1 where ^x}} msg]
  lappend v $msg

do_test main-3.1 {
  catch {db close}
  foreach f [glob -nocomplain testdb/*] {forcedelete $f}
  forcedelete testdb
  sqlite3 db testdb
  set v [catch {execsql {SELECT * from T1 where x!!5}} msg]
  lappend v $msg
} {1 {unrecognized token: "!"}}
do_test main-3.2 {
  catch {db close}
  foreach f [glob -nocomplain testdb/*] {forcedelete $f}
  forcedelete testdb
  sqlite3 db testdb
  set v [catch {execsql {SELECT * from T1 where ^x}} msg]
  lappend v $msg

# At one point, running this would read one byte passed the end of a 
# buffer, upsetting valgrind.
#
do_test misc1-24.0 {
  list [catch { sqlite3_prepare_v2 db ! -1 dummy } msg] $msg
} {1 {(1) unrecognized token: "!}}

# The following query (provided by Kostya Serebryany) used to take 25
# minutes to prepare.  This has been speeded up to about 250 milliseconds.
#
do_catchsql_test misc1-25.0 {
SELECT-1 UNION  SELECT 5 UNION SELECT 0 UNION SElECT*from(SELECT-5) UNION SELECT*from(SELECT-0) UNION  SELECT:SELECT-0 UNION SELECT-1 UNION SELECT 1 UNION SELECT 1 ORDER BY S  in(WITH K AS(WITH K AS(select'CREINDERcharREADEVIRTUL5TABLECONFLICT !1 USIN'' MFtOR(b38q,eWITH K AS(selectCREATe TABLE t0(a,b,c,d,e, PRIMARY KEY(a,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,b,c,d,c,a,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d'CEIl,k'',ab, g, a,b,o11b, i'nEX/charREDE IVT LR!VABLt5SG',N  ,N in rement,l_vacuum,M&U,'te3(''5l' a,bB,b,l*e)SELECT:SELECT, *,*,*from(( SELECT
$group,:conc ap0,1)fro,(select"",:PBAG,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,c,d,c,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d, foreign_keysc,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,c,d,c,a,b,d,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,bb,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,c,d,c,a,b,d,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,MAato_aecSELEC,+?b," "O,"i","a",""b  ,5 ))KEY)SELECT*FROM((k()reaC,k,K) eA,k '' )t ,K  M);
} {1 {'k' is not a function}}


finish_test

# At one point, running this would read one byte passed the end of a 
# buffer, upsetting valgrind.
#
do_test misc1-24.0 {
  list [catch { sqlite3_prepare_v2 db ! -1 dummy } msg] $msg
} {1 {(1) unrecognized token: "!"}}

# The following query (provided by Kostya Serebryany) used to take 25
# minutes to prepare.  This has been speeded up to about 250 milliseconds.
#
do_catchsql_test misc1-25.0 {
SELECT-1 UNION  SELECT 5 UNION SELECT 0 UNION SElECT*from(SELECT-5) UNION SELECT*from(SELECT-0) UNION  SELECT:SELECT-0 UNION SELECT-1 UNION SELECT 1 UNION SELECT 1 ORDER BY S  in(WITH K AS(WITH K AS(select'CREINDERcharREADEVIRTUL5TABLECONFLICT !1 USIN'' MFtOR(b38q,eWITH K AS(selectCREATe TABLE t0(a,b,c,d,e, PRIMARY KEY(a,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,b,c,d,c,a,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d'CEIl,k'',ab, g, a,b,o11b, i'nEX/charREDE IVT LR!VABLt5SG',N  ,N in rement,l_vacuum,M&U,'te3(''5l' a,bB,b,l*e)SELECT:SELECT, *,*,*from(( SELECT
$group,:conc ap0,1)fro,(select"",:PBAG,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,c,d,c,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d, foreign_keysc,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,c,d,c,a,b,d,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,c,a,b,b,c,d,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,d,c,e,d,d,c,a,b,b,c,c,a,b,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,bb,b,E,d,c,d,c,b,c,d,c,d,c,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,a,b,c,e,d,d,c,a,b,b,c,d,d,c,a,b,c,e,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,c,d,c,a,b,d,d,c,a,a,b,d,d,c,a,b,b,c,d,c,a,b,e,e,d,b,c,d,c,a,b,b,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,c,a,b,c,e,d,d,c,a,b,b,c,d,c,d,c,a,b,c,e,c,d,c,a,b,b,c,d,MAato_aecSELEC,+?b," "O,"i","a",""b  ,5 ))KEY)SELECT*FROM((k()reaC,k,K) eA,k '' )t ,K  M);
} {1 {'k' is not a function}}


finish_test

# file-system is saved just before the xDelete() call to remove the 
# master journal file from the file-system.
#
set pwd [get_pwd]
testvfs tv -default 1
tv script copy_on_mj_delete
set ::mj_filename_length 0

proc copy_on_mj_delete {method filename args} {
  if {[string match *mj* [file tail $filename]]} { 
    #
    # NOTE: Is the file name relative?  If so, add the length of the current
    #       directory.
    #
    if {[is_relative_file $filename]} {
      set ::mj_filename_length \
        [expr {[string length $filename] + [string length $::pwd]}]
    } else {
      set ::mj_filename_length [string length $filename]
    }
    faultsim_save 

  }
  return SQLITE_OK
}

foreach {tn1 tcl} {
  1 { set prefix "test.db" }
  2 { 
................................................................................
    }

    set padding [string repeat x [expr $nPadding %32]]
    set prefix "test.db${padding}"
  }
} {
  eval $tcl
  foreach {tn2 sql} {
    o { 
      PRAGMA main.synchronous=OFF;
      PRAGMA aux.synchronous=OFF;
      PRAGMA journal_mode = DELETE;
    }
    o512 { 
      PRAGMA main.synchronous=OFF;
      PRAGMA aux.synchronous=OFF;
      PRAGMA main.page_size = 512;
      PRAGMA aux.page_size = 512;
      PRAGMA journal_mode = DELETE;
    }
    n { 
      PRAGMA main.synchronous=NORMAL;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA journal_mode = DELETE;
    }
    f { 
      PRAGMA main.synchronous=FULL;
      PRAGMA aux.synchronous=FULL;
      PRAGMA journal_mode = DELETE;
    }







































  } {

    set tn "${tn1}.${tn2}"
  
    # Set up a connection to have two databases, test.db (main) and 
    # test.db2 (aux). Then run a multi-file transaction on them. The
    # VFS will snapshot the file-system just before the master-journal
    # file is deleted to commit the transaction.
    #
    tv filter xDelete
    do_test pager1-4.4.$tn.1 {

      faultsim_delete_and_reopen $prefix
      execsql "
        ATTACH '${prefix}2' AS aux;
        $sql
        CREATE TABLE a(x);
        CREATE TABLE aux.b(x);
        INSERT INTO a VALUES('double-you');
................................................................................
        BEGIN;
          INSERT INTO a SELECT * FROM b WHERE rowid<=3;
          INSERT INTO b SELECT * FROM a WHERE rowid<=3;
        COMMIT;
      }
    } {}
    tv filter {}







    
    # Check that the transaction was committed successfully.
    #
    do_execsql_test pager1-4.4.$tn.2 {
      SELECT * FROM a
    } {double-you why zed won too free}
    do_execsql_test pager1-4.4.$tn.3 {
      SELECT * FROM b
    } {won too free double-you why zed}
    

    # Restore the file-system and reopen the databases. Check that it now
    # appears that the transaction was not committed (because the file-system
    # was restored to the state where it had not been).
    #
    do_test pager1-4.4.$tn.4 {
      faultsim_restore_and_reopen $prefix
      execsql "ATTACH '${prefix}2' AS aux"
    } {}
    do_execsql_test pager1-4.4.$tn.5 {SELECT * FROM a} {double-you why zed}
    do_execsql_test pager1-4.4.$tn.6 {SELECT * FROM b} {won too free}

    
    # Restore the file-system again. This time, before reopening the databases,
    # delete the master-journal file from the file-system. It now appears that
    # the transaction was committed (no master-journal file == no rollback).
    #
    do_test pager1-4.4.$tn.7 {

      faultsim_restore_and_reopen $prefix
      foreach f [glob ${prefix}-mj*] { forcedelete $f }




      execsql "ATTACH '${prefix}2' AS aux"

    } {}
    do_execsql_test pager1-4.4.$tn.8 {
      SELECT * FROM a
    } {double-you why zed won too free}
    do_execsql_test pager1-4.4.$tn.9 {
      SELECT * FROM b
    } {won too free double-you why zed}
................................................................................
  }

  cd $pwd
}
db close
tv delete
forcedelete $dirname


# Set up a VFS to make a copy of the file-system just before deleting a
# journal file to commit a transaction. The transaction modifies exactly
# two database pages (and page 1 - the change counter).
#
testvfs tv -default 1
tv sectorsize 512

# file-system is saved just before the xDelete() call to remove the 
# master journal file from the file-system.
#
set pwd [get_pwd]
testvfs tv -default 1
tv script copy_on_mj_delete
set ::mj_filename_length 0
set ::mj_delete_cnt 0
proc copy_on_mj_delete {method filename args} {
  if {[string match *mj* [file tail $filename]]} { 
    #
    # NOTE: Is the file name relative?  If so, add the length of the current
    #       directory.
    #
    if {[is_relative_file $filename]} {
      set ::mj_filename_length \
        [expr {[string length $filename] + [string length $::pwd]}]
    } else {
      set ::mj_filename_length [string length $filename]
    }
    faultsim_save 
    incr ::mj_delete_cnt
  }
  return SQLITE_OK
}

foreach {tn1 tcl} {
  1 { set prefix "test.db" }
  2 { 
................................................................................
    }

    set padding [string repeat x [expr $nPadding %32]]
    set prefix "test.db${padding}"
  }
} {
  eval $tcl
  foreach {tn2 sql usesMJ} {
    o { 
      PRAGMA main.synchronous=OFF;
      PRAGMA aux.synchronous=OFF;
      PRAGMA journal_mode = DELETE;
    } 0
    o512 { 
      PRAGMA main.synchronous=OFF;
      PRAGMA aux.synchronous=OFF;
      PRAGMA main.page_size = 512;
      PRAGMA aux.page_size = 512;
      PRAGMA journal_mode = DELETE;
    } 0
    n { 
      PRAGMA main.synchronous=NORMAL;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA journal_mode = DELETE;
    } 1
    f { 
      PRAGMA main.synchronous=FULL;
      PRAGMA aux.synchronous=FULL;
      PRAGMA journal_mode = DELETE;
    } 1
    w1 { 
      PRAGMA main.synchronous=NORMAL;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA journal_mode = WAL;
    } 0
    w2 { 
      PRAGMA main.synchronous=NORMAL;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA main.journal_mode=DELETE;
      PRAGMA aux.journal_mode=WAL;
    } 0
    o1a { 
      PRAGMA main.synchronous=FULL;
      PRAGMA aux.synchronous=OFF;
      PRAGMA journal_mode=DELETE;
    } 0
    o1b { 
      PRAGMA main.synchronous=OFF;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA journal_mode=DELETE;
    } 0
    m1 { 
      PRAGMA main.synchronous=NORMAL;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA main.journal_mode=DELETE;
      PRAGMA aux.journal_mode = MEMORY;
    } 0
    t1 { 
      PRAGMA main.synchronous=NORMAL;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA main.journal_mode=DELETE;
      PRAGMA aux.journal_mode = TRUNCATE;
    } 1
    p1 { 
      PRAGMA main.synchronous=NORMAL;
      PRAGMA aux.synchronous=NORMAL;
      PRAGMA main.journal_mode=DELETE;
      PRAGMA aux.journal_mode = PERSIST;
    } 1
  } {

    set tn "${tn1}.${tn2}"
  
    # Set up a connection to have two databases, test.db (main) and 
    # test.db2 (aux). Then run a multi-file transaction on them. The
    # VFS will snapshot the file-system just before the master-journal
    # file is deleted to commit the transaction.
    #
    tv filter xDelete
    do_test pager1-4.4.$tn.1 {
      set ::mj_delete_cnt 0
      faultsim_delete_and_reopen $prefix
      execsql "
        ATTACH '${prefix}2' AS aux;
        $sql
        CREATE TABLE a(x);
        CREATE TABLE aux.b(x);
        INSERT INTO a VALUES('double-you');
................................................................................
        BEGIN;
          INSERT INTO a SELECT * FROM b WHERE rowid<=3;
          INSERT INTO b SELECT * FROM a WHERE rowid<=3;
        COMMIT;
      }
    } {}
    tv filter {}

    # Verify that a master journal was deleted only for those cases where
    # master journals really ought to be used
    #
    do_test pager1-4.4.$tn.1b {
      set ::mj_delete_cnt
    } $usesMJ
    
    # Check that the transaction was committed successfully.
    #
    do_execsql_test pager1-4.4.$tn.2 {
      SELECT * FROM a
    } {double-you why zed won too free}
    do_execsql_test pager1-4.4.$tn.3 {
      SELECT * FROM b
    } {won too free double-you why zed}
    
    if {$usesMJ} {
      # Restore the file-system and reopen the databases. Check that it now
      # appears that the transaction was not committed (because the file-system
      # was restored to the state where it had not been).
      #
      do_test pager1-4.4.$tn.4 {
        faultsim_restore_and_reopen $prefix
        execsql "ATTACH '${prefix}2' AS aux"
      } {}
      do_execsql_test pager1-4.4.$tn.5 {SELECT * FROM a} {double-you why zed}
      do_execsql_test pager1-4.4.$tn.6 {SELECT * FROM b} {won too free}
    }
    
    # Restore the file-system again. This time, before reopening the databases,
    # delete the master-journal file from the file-system. It now appears that
    # the transaction was committed (no master-journal file == no rollback).
    #
    do_test pager1-4.4.$tn.7 {
      if {$::mj_delete_cnt>0} {
        faultsim_restore_and_reopen $prefix
        foreach f [glob ${prefix}-mj*] { forcedelete $f }
      } else {
        db close
        sqlite3 db $prefix
      }
      execsql "ATTACH '${prefix}2' AS aux"
      glob -nocomplain ${prefix}-mj*
    } {}
    do_execsql_test pager1-4.4.$tn.8 {
      SELECT * FROM a
    } {double-you why zed won too free}
    do_execsql_test pager1-4.4.$tn.9 {
      SELECT * FROM b
    } {won too free double-you why zed}
................................................................................
  }

  cd $pwd
}
db close
tv delete
forcedelete $dirname


# Set up a VFS to make a copy of the file-system just before deleting a
# journal file to commit a transaction. The transaction modifies exactly
# two database pages (and page 1 - the change counter).
#
testvfs tv -default 1
tv sectorsize 512

# 2016 February 19
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# 
# This file implements tests for the REGEXP operator in ext/misc/regexp.c.
# It focuses on the use of the sqlite3_set_auxdata()/get_auxdata() APIs.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix regexp2

load_static_extension db regexp

#-------------------------------------------------------------------------
# Test that triggers do not become confused and use aux-data created by
# a different trigger for a different REGEXP invocation.
#
do_execsql_test 1.0 {
  CREATE TABLE t1(a, b, c);
  CREATE TABLE x1(x, y, z);
  CREATE TABLE x2(x, y, z);

  CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN
    INSERT INTO x1 VALUES(
        new.a REGEXP 'abc',
        new.b REGEXP 'abc',
        new.c REGEXP 'abc'
    );
  END;

  CREATE TRIGGER tr2 AFTER INSERT ON t1 BEGIN
    INSERT INTO x2 VALUES(
        new.a REGEXP 'def',
        new.b REGEXP 'def',
        new.c REGEXP 'def'
    );
  END;

  INSERT INTO t1 VALUES('abc', 'def', 'abc');
  SELECT * FROM t1;
} {abc def abc}

do_execsql_test 1.1 { SELECT * FROM x1 } {1 0 1}
do_execsql_test 1.2 { SELECT * FROM x2 } {0 1 0}

#-------------------------------------------------------------------------
# Test that if an exception is thrown several triggers deep, all aux-data
# objects are cleaned up correctly.
#
proc sql_error {} {
  error "SQL error!"
}
db func error sql_error
do_execsql_test 2.0 {
  CREATE TABLE t2(a, b);
  CREATE TABLE t3(c, d);
  CREATE TABLE t4(e, f);

  CREATE TRIGGER t2_tr1 AFTER UPDATE ON t2 BEGIN
    UPDATE t3 SET d = new.b WHERE c = old.a;
  END;

  CREATE TRIGGER t3_tr1 AFTER UPDATE ON t3 BEGIN
    UPDATE t4 SET f = new.d WHERE e = old.c AND new.d REGEXP 'a.*';
  END;

  CREATE TRIGGER t4_tr1 AFTER UPDATE ON t4 BEGIN
    SELECT CASE WHEN new.f REGEXP '.*y.*' THEN error() ELSE 1 END;
  END;

  INSERT INTO t2 VALUES(1, 'a_x_1');
  INSERT INTO t2 VALUES(2, 'a_y_1');

  INSERT INTO t3 VALUES(1, 'b1');
  INSERT INTO t3 VALUES(2, 'b2');

  INSERT INTO t4 VALUES(1, 'b1');
  INSERT INTO t4 VALUES(2, 'b2');
} {}

do_catchsql_test 2.1 {
  UPDATE t2 SET a=a+1 WHERE b REGEXP 'a.*' AND b REGEXP '.*1';
} {1 {SQL error!}}

# Test that the triggers used in the test above work as expected.
#
do_execsql_test 2.2 {
  UPDATE t2 SET b = 'a_abc_1';
} {}
do_execsql_test 2.3 {
  SELECT * FROM t2;
  SELECT * FROM t3;
  SELECT * FROM t4;
} {1 a_abc_1 2 a_abc_1 1 a_abc_1 2 a_abc_1 1 a_abc_1 2 a_abc_1}

#-------------------------------------------------------------------------
# Test that trigger parameters (i.e. new.* and old.*) refs are not 
# considered to be constant across separate invocations of the trigger.
#
do_execsql_test 3.0 {
  CREATE TABLE t5(a);
  CREATE TABLE t6(x);

  CREATE TRIGGER t5tr AFTER DELETE ON t5 BEGIN
    DELETE FROM t6 WHERE t6.x REGEXP old.a;
  END;

  INSERT INTO t5 VALUES ('^a.*'), ('^b.*'), ('^c.*');
  INSERT INTO t6 VALUES ('eab'), ('abc'), ('bcd'), ('cde'), ('dea');

  DELETE FROM t5;
  SELECT * FROM t6;
} {eab dea}


finish_test

  void *pLook = 0;              /* Allocated lookaside space */
  void *pPCache = 0;            /* Allocated storage for pcache */
  void *pScratch = 0;           /* Allocated storage for scratch */
  int iCur, iHi;                /* Stats values, current and "highwater" */
  int i;                        /* Loop counter */
  int rc;                       /* API return code */




  /* Process command-line arguments */
  g.zWR = "";
  g.zNN = "";
  g.zPK = "UNIQUE";
  g.szTest = 100;
  for(i=1; i<argc; i++){
    const char *z = argv[i];

  void *pLook = 0;              /* Allocated lookaside space */
  void *pPCache = 0;            /* Allocated storage for pcache */
  void *pScratch = 0;           /* Allocated storage for scratch */
  int iCur, iHi;                /* Stats values, current and "highwater" */
  int i;                        /* Loop counter */
  int rc;                       /* API return code */

  /* Display the version of SQLite being tested */
  printf("Speedtest1 for SQLite %s %.50s\n", sqlite3_libversion(), sqlite3_sourceid());

  /* Process command-line arguments */
  g.zWR = "";
  g.zNN = "";
  g.zPK = "UNIQUE";
  g.szTest = 100;
  for(i=1; i<argc; i++){
    const char *z = argv[i];

# This command should be called after loading tester.tcl from within
# all test scripts that are incompatible with encryption codecs.
#
proc do_not_use_codec {} {
  set ::do_not_use_codec 1
  reset_db
}
















# The following block only runs the first time this file is sourced. It
# does not run in slave interpreters (since the ::cmdlinearg array is
# populated before the test script is run in slave interpreters).
#
if {[info exists cmdlinearg]==0} {

................................................................................
        foreach {dummy cmdlinearg(verbose)} [split $a =] break
        if {$cmdlinearg(verbose)=="file"} {
          set cmdlinearg(verbose) 2
        } elseif {[string is boolean -strict $cmdlinearg(verbose)]==0} {
          error "option --verbose= must be set to a boolean or to \"file\""
        }
      }








      default {
        lappend leftover $a
      }
    }
  }
  set argv $leftover

# This command should be called after loading tester.tcl from within
# all test scripts that are incompatible with encryption codecs.
#
proc do_not_use_codec {} {
  set ::do_not_use_codec 1
  reset_db
}

# Print a HELP message and exit
#
proc print_help_and_quit {} {
  puts {Options:
  --pause                  Wait for user input before continuing
  --soft-heap-limit=N      Set the soft-heap-limit to N
  --maxerror=N             Quit after N errors
  --verbose=(0|1)          Control the amount of output.  Default '1'
  --output=FILE            set --verbose=2 and output to FILE.  Implies -q
  -q                       Shorthand for --verbose=0
  --help                   This message
}
  exit 1
}

# The following block only runs the first time this file is sourced. It
# does not run in slave interpreters (since the ::cmdlinearg array is
# populated before the test script is run in slave interpreters).
#
if {[info exists cmdlinearg]==0} {

................................................................................
        foreach {dummy cmdlinearg(verbose)} [split $a =] break
        if {$cmdlinearg(verbose)=="file"} {
          set cmdlinearg(verbose) 2
        } elseif {[string is boolean -strict $cmdlinearg(verbose)]==0} {
          error "option --verbose= must be set to a boolean or to \"file\""
        }
      }
      {.*help.*} {
         print_help_and_quit
      }
      {^-q$} {
        set cmdlinearg(output) test-out.txt
        set cmdlinearg(verbose) 2
      }

      default {
        lappend leftover $a
      }
    }
  }
  set argv $leftover

REM name of an existing directory to be used as the final destination directory
REM for the generated output files, which will be placed in sub-directories
REM created therein.  Ideally, the directory specified should be empty.
REM
REM Example:
REM
REM                        CD /D C:\dev\sqlite\core
REM                        tool\build-all-msvc.bat C:\Temp
REM
REM In the example above, "C:\dev\sqlite\core" represents the root of the
REM source tree for SQLite and "C:\Temp" represents the final destination
REM directory for the generated output files.
REM
REM Please note that the SQLite build process performed by the Makefile
REM associated with this batch script requires a Tcl shell to be present
................................................................................
REM may be necessary, depending on the platforms to be built.  These values in
REM these three variables should be surrounded by double quotes if they contain
REM spaces.
REM
REM There are a few other environment variables that impact the build process
REM when set ^(to anything^), they are:
REM





REM                        NOCLEAN
REM
REM When set, the "clean" target will not be used during each build iteration.
REM However, the target binaries, if any, will still be deleted manually prior
REM to being rebuilt.  Setting this environment variable is only rarely needed
REM and could cause issues in some circumstances; therefore, setting it is not
REM recommended.
................................................................................
REM
REM                        NOSYMBOLS
REM
REM When set, copying of symbol files ^(*.pdb^) created during the build will
REM be skipped and they will not appear in the final destination directory.
REM Setting this environment variable is never strictly needed and could cause
REM issues in some circumstances; therefore, setting it is not recommended.





REM
REM                        BUILD_ALL_SHELL
REM
REM When set, the command line shell will be built for each selected platform
REM and configuration as well.  In addition, the command line shell binaries
REM will be copied, with their symbols, to the final destination directory.
REM
................................................................................
REM                        USE_WINV100_NSDKLIBPATH
REM
REM When set, modifies how the NSDKLIBPATH environment variable is built, based
REM on the WindowsSdkDir environment variable.  It causes this batch script to
REM assume the Windows 10.0 SDK location should be used.
REM
REM                        NMAKE_ARGS


REM
REM When set, the value is expanded and passed to the NMAKE command line, after
REM its other arguments.  This is used to specify additional NMAKE options, for
REM example:
REM
REM                        SET NMAKE_ARGS=FOR_WINRT=1


REM
REM Using the above command before running this tool will cause the compiled
REM binaries to target the WinRT environment, which provides a subset of the
REM Win32 API.









REM
SETLOCAL

REM SET __ECHO=ECHO
REM SET __ECHO2=ECHO
REM SET __ECHO3=ECHO
IF NOT DEFINED _AECHO (SET _AECHO=REM)
................................................................................
%_VECHO% Configurations = '%CONFIGURATIONS%'

REM
REM NOTE: If the command used to invoke NMAKE is not already set, use the
REM       default.
REM
IF NOT DEFINED NMAKE_CMD (



  SET NMAKE_CMD=nmake -B -f Makefile.msc

)

%_VECHO% NmakeCmd = '%NMAKE_CMD%'
%_VECHO% NmakeArgs = '%NMAKE_ARGS%'



REM
REM NOTE: Setup environment variables to translate between the MSVC platform
REM       names and the names to be used for the platform-specific binary
REM       directories.
REM
SET amd64_NAME=x64
................................................................................
REM NOTE: A Tcl shell executable is required during the SQLite build process
REM       unless a pre-existing amalgamation file is used.
REM
IF NOT DEFINED %TCLSH_FILE%_PATH (
  ECHO The Tcl shell executable "%TCLSH_FILE%" is required to be in the PATH.
  GOTO errors
)

























REM
REM NOTE: Set the TOOLPATH variable to contain all the directories where the
REM       external tools were found in the search above.
REM
CALL :fn_CopyVariable %TCLSH_FILE%_PATH TOOLPATH

................................................................................
        REM
        SET DEBUG=3

        REM
        REM NOTE: Setting this to non-zero should enable the SQLITE_MEMDEBUG
        REM       define.
        REM

        SET MEMDEBUG=1

      ) ELSE (
        CALL :fn_UnsetVariable DEBUG
        CALL :fn_UnsetVariable MEMDEBUG
      )







      REM
      REM NOTE: Launch a nested command shell to perform the following steps:
      REM
      REM       1. Setup the MSVC environment for this platform using the
      REM          official batch file.
      REM
      REM       2. Make sure that no stale build output files are present.
................................................................................
        REM
        REM NOTE: Unless prevented from doing so, invoke NMAKE with the MSVC
        REM       makefile to clean any stale build output from previous
        REM       iterations of this loop and/or previous runs of this batch
        REM       file, etc.
        REM
        IF NOT DEFINED NOCLEAN (
          %__ECHO% %NMAKE_CMD% clean

          IF ERRORLEVEL 1 (
            ECHO Failed to clean for platform %%P.
            GOTO errors
          )
        ) ELSE (
          REM
          REM NOTE: Even when the cleaning step has been disabled, we still
          REM       need to remove the build output for all the files we are
          REM       specifically wanting to build for each platform.
          REM
          %_AECHO% Cleaning final core library output files only...
          %__ECHO% DEL /Q *.lo sqlite3.dll sqlite3.lib sqlite3.pdb 2%REDIRECT% NUL
        )

        REM
        REM NOTE: Call NMAKE with the MSVC makefile to build the "sqlite3.dll"
        REM       binary.  The x86 compiler will be used to compile the native
        REM       command line tools needed during the build process itself.
        REM       Also, disable looking for and/or linking to the native Tcl
        REM       runtime library.
        REM
        %__ECHO% %NMAKE_CMD% sqlite3.dll XCOMPILE=1 USE_NATIVE_LIBPATHS=1 NO_TCL=1 %NMAKE_ARGS%

        IF ERRORLEVEL 1 (
          ECHO Failed to build %%B "sqlite3.dll" for platform %%P.
          GOTO errors
        )

        REM
        REM NOTE: Copy the "sqlite3.dll" file to the appropriate directory for
        REM       the build and platform beneath the binary directory.
        REM
        %__ECHO% XCOPY sqlite3.dll "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

        IF ERRORLEVEL 1 (
          ECHO Failed to copy "sqlite3.dll" to "%BINARYDIRECTORY%\%%B\%%D\".
          GOTO errors
        )

        REM
        REM NOTE: Copy the "sqlite3.lib" file to the appropriate directory for
        REM       the build and platform beneath the binary directory.
        REM
        %__ECHO% XCOPY sqlite3.lib "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

        IF ERRORLEVEL 1 (
          ECHO Failed to copy "sqlite3.lib" to "%BINARYDIRECTORY%\%%B\%%D\".
          GOTO errors
        )

        REM
        REM NOTE: Copy the "sqlite3.pdb" file to the appropriate directory for
        REM       the build and platform beneath the binary directory unless we
        REM       are prevented from doing so.
        REM
        IF NOT DEFINED NOSYMBOLS (
          %__ECHO% XCOPY sqlite3.pdb "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

          IF ERRORLEVEL 1 (
            ECHO Failed to copy "sqlite3.pdb" to "%BINARYDIRECTORY%\%%B\%%D\".
            GOTO errors
          )
        )

        REM
        REM NOTE: If requested, also build the shell executable.
        REM
................................................................................
          IF DEFINED NOCLEAN (
            REM
            REM NOTE: Even when the cleaning step has been disabled, we still
            REM       need to remove the build output for all the files we are
            REM       specifically wanting to build for each platform.
            REM
            %_AECHO% Cleaning final shell executable output files only...
            %__ECHO% DEL /Q sqlite3.exe sqlite3sh.pdb 2%REDIRECT% NUL
          )

          REM
          REM NOTE: Call NMAKE with the MSVC makefile to build the "sqlite3.exe"
          REM       binary.  The x86 compiler will be used to compile the native
          REM       command line tools needed during the build process itself.
          REM       Also, disable looking for and/or linking to the native Tcl
          REM       runtime library.
          REM
          %__ECHO% %NMAKE_CMD% sqlite3.exe XCOMPILE=1 USE_NATIVE_LIBPATHS=1 NO_TCL=1 %NMAKE_ARGS%

          IF ERRORLEVEL 1 (
            ECHO Failed to build %%B "sqlite3.exe" for platform %%P.
            GOTO errors
          )

          REM
          REM NOTE: Copy the "sqlite3.exe" file to the appropriate directory
          REM       for the build and platform beneath the binary directory.
          REM
          %__ECHO% XCOPY sqlite3.exe "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

          IF ERRORLEVEL 1 (
            ECHO Failed to copy "sqlite3.exe" to "%BINARYDIRECTORY%\%%B\%%D\".
            GOTO errors
          )

          REM
          REM NOTE: Copy the "sqlite3sh.pdb" file to the appropriate directory
          REM       for the build and platform beneath the binary directory
          REM       unless we are prevented from doing so.
          REM
          IF NOT DEFINED NOSYMBOLS (
            %__ECHO% XCOPY sqlite3sh.pdb "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

            IF ERRORLEVEL 1 (
              ECHO Failed to copy "sqlite3sh.pdb" to "%BINARYDIRECTORY%\%%B\%%D\".
              GOTO errors
            )
          )
        )
      )
    )
  )
................................................................................
  GOTO errors
)

REM
REM NOTE: If we get to this point, we have succeeded.
REM
GOTO no_errors













:fn_ShowVariable
  SETLOCAL
  SET __ECHO_CMD=ECHO %%%2%%
  FOR /F "delims=" %%V IN ('%__ECHO_CMD%') DO (
    IF NOT "%%V" == "" (
      IF NOT "%%V" == "%%%2%%" (

REM name of an existing directory to be used as the final destination directory
REM for the generated output files, which will be placed in sub-directories
REM created therein.  Ideally, the directory specified should be empty.
REM
REM Example:
REM
REM                        CD /D C:\dev\sqlite\core
REM                        CALL tool\build-all-msvc.bat C:\Temp
REM
REM In the example above, "C:\dev\sqlite\core" represents the root of the
REM source tree for SQLite and "C:\Temp" represents the final destination
REM directory for the generated output files.
REM
REM Please note that the SQLite build process performed by the Makefile
REM associated with this batch script requires a Tcl shell to be present
................................................................................
REM may be necessary, depending on the platforms to be built.  These values in
REM these three variables should be surrounded by double quotes if they contain
REM spaces.
REM
REM There are a few other environment variables that impact the build process
REM when set ^(to anything^), they are:
REM
REM                        USE_AUTOCONF_MAKEFILE
REM
REM When set, the "autoconf" Makefile for MSVC will be used instead of the main
REM Makefile for MSVC.  It must exist at "%ROOT%\autoconf\Makefile.msc".
REM
REM                        NOCLEAN
REM
REM When set, the "clean" target will not be used during each build iteration.
REM However, the target binaries, if any, will still be deleted manually prior
REM to being rebuilt.  Setting this environment variable is only rarely needed
REM and could cause issues in some circumstances; therefore, setting it is not
REM recommended.
................................................................................
REM
REM                        NOSYMBOLS
REM
REM When set, copying of symbol files ^(*.pdb^) created during the build will
REM be skipped and they will not appear in the final destination directory.
REM Setting this environment variable is never strictly needed and could cause
REM issues in some circumstances; therefore, setting it is not recommended.
REM
REM                        NOMEMDEBUG
REM
REM When set, disables use of MEMDEBUG when building binaries for the "Debug"
REM configuration.
REM
REM                        BUILD_ALL_SHELL
REM
REM When set, the command line shell will be built for each selected platform
REM and configuration as well.  In addition, the command line shell binaries
REM will be copied, with their symbols, to the final destination directory.
REM
................................................................................
REM                        USE_WINV100_NSDKLIBPATH
REM
REM When set, modifies how the NSDKLIBPATH environment variable is built, based
REM on the WindowsSdkDir environment variable.  It causes this batch script to
REM assume the Windows 10.0 SDK location should be used.
REM
REM                        NMAKE_ARGS
REM                        NMAKE_ARGS_DEBUG
REM                        NMAKE_ARGS_RETAIL
REM
REM When set, these values are expanded and passed to the NMAKE command line,
REM after its other arguments.  These may be used to specify additional NMAKE
REM options, for example:
REM
REM                        SET NMAKE_ARGS=FOR_WINRT=1
REM                        SET NMAKE_ARGS_DEBUG=MEMDEBUG=1
REM                        SET NMAKE_ARGS_RETAIL=WIN32HEAP=1
REM
REM Using the above command before running this tool will cause the compiled
REM binaries to target the WinRT environment, which provides a subset of the
REM Win32 API.
REM
REM                        DLL_FILE_NAME
REM                        DLL_PDB_FILE_NAME
REM                        LIB_FILE_NAME
REM                        EXE_FILE_NAME
REM                        EXE_PDB_FILE_NAME
REM
REM When set, these values will override the associated target file name used
REM for the build.
REM
SETLOCAL

REM SET __ECHO=ECHO
REM SET __ECHO2=ECHO
REM SET __ECHO3=ECHO
IF NOT DEFINED _AECHO (SET _AECHO=REM)
................................................................................
%_VECHO% Configurations = '%CONFIGURATIONS%'

REM
REM NOTE: If the command used to invoke NMAKE is not already set, use the
REM       default.
REM
IF NOT DEFINED NMAKE_CMD (
  IF DEFINED USE_AUTOCONF_MAKEFILE (
    SET NMAKE_CMD=nmake -B -f autoconf\Makefile.msc
  ) ELSE (
    SET NMAKE_CMD=nmake -B -f Makefile.msc
  )
)

%_VECHO% NmakeCmd = '%NMAKE_CMD%'
%_VECHO% NmakeArgs = '%NMAKE_ARGS%'
%_VECHO% NmakeArgsDebug = '%NMAKE_ARGS_DEBUG%'
%_VECHO% NmakeArgsRetail = '%NMAKE_ARGS_RETAIL%'

REM
REM NOTE: Setup environment variables to translate between the MSVC platform
REM       names and the names to be used for the platform-specific binary
REM       directories.
REM
SET amd64_NAME=x64
................................................................................
REM NOTE: A Tcl shell executable is required during the SQLite build process
REM       unless a pre-existing amalgamation file is used.
REM
IF NOT DEFINED %TCLSH_FILE%_PATH (
  ECHO The Tcl shell executable "%TCLSH_FILE%" is required to be in the PATH.
  GOTO errors
)

REM
REM NOTE: Setup the default names for the build targets we are creating.  Any
REM       ^(or all^) of these may end up being overridden.
REM
IF NOT DEFINED DLL_FILE_NAME (
  SET DLL_FILE_NAME=sqlite3.dll
)

IF NOT DEFINED DLL_PDB_FILE_NAME (
  SET DLL_PDB_FILE_NAME=sqlite3.pdb
)

IF NOT DEFINED LIB_FILE_NAME (
  SET LIB_FILE_NAME=sqlite3.lib
)

IF NOT DEFINED EXE_FILE_NAME (
  SET EXE_FILE_NAME=sqlite3.exe
)

IF NOT DEFINED EXE_PDB_FILE_NAME (
  SET EXE_PDB_FILE_NAME=sqlite3sh.pdb
)

REM
REM NOTE: Set the TOOLPATH variable to contain all the directories where the
REM       external tools were found in the search above.
REM
CALL :fn_CopyVariable %TCLSH_FILE%_PATH TOOLPATH

................................................................................
        REM
        SET DEBUG=3

        REM
        REM NOTE: Setting this to non-zero should enable the SQLITE_MEMDEBUG
        REM       define.
        REM
        IF NOT DEFINED NOMEMDEBUG (
          SET MEMDEBUG=1
        )
      ) ELSE (
        CALL :fn_UnsetVariable DEBUG
        CALL :fn_UnsetVariable MEMDEBUG
      )

      REM
      REM NOTE: Copy the extra NMAKE arguments for this configuration into the
      REM       common variable used by the actual commands.
      REM
      CALL :fn_CopyVariable NMAKE_ARGS_%%B NMAKE_ARGS_CFG

      REM
      REM NOTE: Launch a nested command shell to perform the following steps:
      REM
      REM       1. Setup the MSVC environment for this platform using the
      REM          official batch file.
      REM
      REM       2. Make sure that no stale build output files are present.
................................................................................
        REM
        REM NOTE: Unless prevented from doing so, invoke NMAKE with the MSVC
        REM       makefile to clean any stale build output from previous
        REM       iterations of this loop and/or previous runs of this batch
        REM       file, etc.
        REM
        IF NOT DEFINED NOCLEAN (
          CALL :fn_MakeClean %%D

          IF ERRORLEVEL 1 (
            ECHO Failed to clean for platform %%P.
            GOTO errors
          )
        ) ELSE (
          REM
          REM NOTE: Even when the cleaning step has been disabled, we still
          REM       need to remove the build output for all the files we are
          REM       specifically wanting to build for each platform.
          REM
          %_AECHO% Cleaning final core library output files only...
          %__ECHO% DEL /Q *.lo "%DLL_FILE_NAME%" "%LIB_FILE_NAME%" "%DLL_PDB_FILE_NAME%" 2%REDIRECT% NUL
        )

        REM
        REM NOTE: Call NMAKE with the MSVC makefile to build the "sqlite3.dll"
        REM       binary.  The x86 compiler will be used to compile the native
        REM       command line tools needed during the build process itself.
        REM       Also, disable looking for and/or linking to the native Tcl
        REM       runtime library.
        REM
        CALL :fn_MakeDll %%D

        IF ERRORLEVEL 1 (
          ECHO Failed to build %%B "%DLL_FILE_NAME%" for platform %%P.
          GOTO errors
        )

        REM
        REM NOTE: Copy the "sqlite3.dll" file to the appropriate directory for
        REM       the build and platform beneath the binary directory.
        REM
        %__ECHO% XCOPY "%DLL_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

        IF ERRORLEVEL 1 (
          ECHO Failed to copy "%DLL_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
          GOTO errors
        )

        REM
        REM NOTE: Copy the "sqlite3.lib" file to the appropriate directory for
        REM       the build and platform beneath the binary directory.
        REM
        %__ECHO% XCOPY "%LIB_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

        IF ERRORLEVEL 1 (
          ECHO Failed to copy "%LIB_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
          GOTO errors
        )

        REM
        REM NOTE: Copy the "sqlite3.pdb" file to the appropriate directory for
        REM       the build and platform beneath the binary directory unless we
        REM       are prevented from doing so.
        REM
        IF NOT DEFINED NOSYMBOLS (
          %__ECHO% XCOPY "%DLL_PDB_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

          IF ERRORLEVEL 1 (
            ECHO Failed to copy "%DLL_PDB_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
            GOTO errors
          )
        )

        REM
        REM NOTE: If requested, also build the shell executable.
        REM
................................................................................
          IF DEFINED NOCLEAN (
            REM
            REM NOTE: Even when the cleaning step has been disabled, we still
            REM       need to remove the build output for all the files we are
            REM       specifically wanting to build for each platform.
            REM
            %_AECHO% Cleaning final shell executable output files only...
            %__ECHO% DEL /Q "%EXE_FILE_NAME%" "%EXE_PDB_FILE_NAME%" 2%REDIRECT% NUL
          )

          REM
          REM NOTE: Call NMAKE with the MSVC makefile to build the "sqlite3.exe"
          REM       binary.  The x86 compiler will be used to compile the native
          REM       command line tools needed during the build process itself.
          REM       Also, disable looking for and/or linking to the native Tcl
          REM       runtime library.
          REM
          CALL :fn_MakeExe %%D

          IF ERRORLEVEL 1 (
            ECHO Failed to build %%B "%EXE_FILE_NAME%" for platform %%P.
            GOTO errors
          )

          REM
          REM NOTE: Copy the "sqlite3.exe" file to the appropriate directory
          REM       for the build and platform beneath the binary directory.
          REM
          %__ECHO% XCOPY "%EXE_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

          IF ERRORLEVEL 1 (
            ECHO Failed to copy "%EXE_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
            GOTO errors
          )

          REM
          REM NOTE: Copy the "sqlite3sh.pdb" file to the appropriate directory
          REM       for the build and platform beneath the binary directory
          REM       unless we are prevented from doing so.
          REM
          IF NOT DEFINED NOSYMBOLS (
            %__ECHO% XCOPY "%EXE_PDB_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%

            IF ERRORLEVEL 1 (
              ECHO Failed to copy "%EXE_PDB_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
              GOTO errors
            )
          )
        )
      )
    )
  )
................................................................................
  GOTO errors
)

REM
REM NOTE: If we get to this point, we have succeeded.
REM
GOTO no_errors

:fn_MakeClean
  %__ECHO% %NMAKE_CMD% clean "PLATFORM=%1" XCOMPILE=1 USE_NATIVE_LIBPATHS=1 NO_TCL=1 %NMAKE_ARGS% %NMAKE_ARGS_CFG%
  GOTO :EOF

:fn_MakeDll
  %__ECHO% %NMAKE_CMD% "%DLL_FILE_NAME%" "PLATFORM=%1" XCOMPILE=1 USE_NATIVE_LIBPATHS=1 NO_TCL=1 %NMAKE_ARGS% %NMAKE_ARGS_CFG%
  GOTO :EOF

:fn_MakeExe
  %__ECHO% %NMAKE_CMD% "%EXE_FILE_NAME%" "PLATFORM=%1" XCOMPILE=1 USE_NATIVE_LIBPATHS=1 NO_TCL=1 %NMAKE_ARGS% %NMAKE_ARGS_CFG%
  GOTO :EOF

:fn_ShowVariable
  SETLOCAL
  SET __ECHO_CMD=ECHO %%%2%%
  FOR /F "delims=" %%V IN ('%__ECHO_CMD%') DO (
    IF NOT "%%V" == "" (
      IF NOT "%%V" == "%%%2%%" (

  int lhsStart;            /* True if left-hand side is the start symbol */
  int ruleline;            /* Line number for the rule */
  int nrhs;                /* Number of RHS symbols */
  struct symbol **rhs;     /* The RHS symbols */
  const char **rhsalias;   /* An alias for each RHS symbol (NULL if none) */
  int line;                /* Line number at which code begins */
  const char *code;        /* The code executed when this rule is reduced */


  struct symbol *precsym;  /* Precedence symbol for this rule */
  int index;               /* An index number for this rule */
  Boolean canReduce;       /* True if this rule is ever reduced */
  struct rule *nextlhs;    /* Next rule with the same LHS */
  struct rule *next;       /* Next rule in the global list */
};

................................................................................
  static char empty[1] = { 0 };
  static char *z = 0;
  static int alloced = 0;
  static int used = 0;
  int c;
  char zInt[40];
  if( zText==0 ){

    used = 0;
    return z;
  }
  if( n<=0 ){
    if( n<0 ){
      used += n;
      assert( used>=0 );
................................................................................
  return z;
}

/*
** zCode is a string that is the action associated with a rule.  Expand
** the symbols in this string so that the refer to elements of the parser
** stack.



*/
PRIVATE void translate_code(struct lemon *lemp, struct rule *rp){
  char *cp, *xp;
  int i;



  char lhsused = 0;    /* True if the LHS element has been used */

  char used[MAXRHS];   /* True for each RHS element which is used */



  for(i=0; i<rp->nrhs; i++) used[i] = 0;
  lhsused = 0;

  if( rp->code==0 ){
    static char newlinestr[2] = { '\n', '\0' };
    rp->code = newlinestr;
    rp->line = rp->ruleline;
  }













  append_str(0,0,0,0);






































  /* This const cast is wrong but harmless, if we're careful. */
  for(cp=(char *)rp->code; *cp; cp++){






    if( ISALPHA(*cp) && (cp==rp->code || (!ISALNUM(cp[-1]) && cp[-1]!='_')) ){
      char saved;
      for(xp= &cp[1]; ISALNUM(*xp) || *xp=='_'; xp++);
      saved = *xp;
      *xp = 0;
      if( rp->lhsalias && strcmp(cp,rp->lhsalias)==0 ){
        append_str("yygotominor.yy%d",0,rp->lhs->dtnum,0);
        cp = xp;
        lhsused = 1;
      }else{
        for(i=0; i<rp->nrhs; i++){
          if( rp->rhsalias[i] && strcmp(cp,rp->rhsalias[i])==0 ){





            if( cp!=rp->code && cp[-1]=='@' ){
              /* If the argument is of the form @X then substituted
              ** the token number of X, not the value of X */
              append_str("yymsp[%d].major",-1,i-rp->nrhs+1,0);
            }else{
              struct symbol *sp = rp->rhs[i];
              int dtnum;
              if( sp->type==MULTITERMINAL ){
................................................................................
          }
        }
      }
      *xp = saved;
    }
    append_str(cp, 1, 0, 0);
  } /* End loop */






  /* Check to make sure the LHS has been used */
  if( rp->lhsalias && !lhsused ){
    ErrorMsg(lemp->filename,rp->ruleline,
      "Label \"%s\" for \"%s(%s)\" is never used.",
        rp->lhsalias,rp->lhs->name,rp->lhsalias);
    lemp->errorcnt++;
  }

  /* Generate destructor code for RHS symbols which are not used in the
  ** reduce code */

  for(i=0; i<rp->nrhs; i++){
    if( rp->rhsalias[i] && !used[i] ){



      ErrorMsg(lemp->filename,rp->ruleline,

















        "Label %s for \"%s(%s)\" is never used.",
        rp->rhsalias[i],rp->rhs[i]->name,rp->rhsalias[i]);
      lemp->errorcnt++;
    }else if( rp->rhsalias[i]==0 ){

      if( has_destructor(rp->rhs[i],lemp) ){
        append_str("  yy_destructor(yypParser,%d,&yymsp[%d].minor);\n", 0,
           rp->rhs[i]->index,i-rp->nrhs+1);
      }else{
        /* No destructor defined for this term */
      }
    }
  }
  if( rp->code ){









    cp = append_str(0,0,0,0);
    rp->code = Strsafe(cp?cp:"");
  }

}

/* 
** Generate code which executes when the rule "rp" is reduced.  Write
** the code to "out".  Make sure lineno stays up-to-date.
*/
PRIVATE void emit_code(
  FILE *out,
  struct rule *rp,
  struct lemon *lemp,
  int *lineno
){
 const char *cp;







 /* Generate code to do the reduce action */
 if( rp->code ){
   if( !lemp->nolinenosflag ){
     (*lineno)++;
     tplt_linedir(out,rp->line,lemp->filename);
   }
   fprintf(out,"{%s",rp->code);
   for(cp=rp->code; *cp; cp++){
     if( *cp=='\n' ) (*lineno)++;
   } /* End loop */
   fprintf(out,"}\n"); (*lineno)++;
   if( !lemp->nolinenosflag ){
     (*lineno)++;
     tplt_linedir(out,*lineno,lemp->outname);
   }








 } /* End if( rp->code ) */



 return;
}

/*
** Print the definition of the union used for the parser's data stack.
** This union contains fields for every possible data type for tokens
................................................................................
  */
  for(rp=lemp->rule; rp; rp=rp->next){
    fprintf(out,"  { %d, %d },\n",rp->lhs->index,rp->nrhs); lineno++;
  }
  tplt_xfer(lemp->name,in,out,&lineno);

  /* Generate code which execution during each REDUCE action */

  for(rp=lemp->rule; rp; rp=rp->next){
    translate_code(lemp, rp);



  }
  /* First output rules other than the default: rule */
  for(rp=lemp->rule; rp; rp=rp->next){
    struct rule *rp2;               /* Other rules with the same action */
    if( rp->code==0 ) continue;
    if( rp->code[0]=='\n' && rp->code[1]==0 ) continue; /* Will be default: */
    fprintf(out,"      case %d: /* ", rp->index);

  int lhsStart;            /* True if left-hand side is the start symbol */
  int ruleline;            /* Line number for the rule */
  int nrhs;                /* Number of RHS symbols */
  struct symbol **rhs;     /* The RHS symbols */
  const char **rhsalias;   /* An alias for each RHS symbol (NULL if none) */
  int line;                /* Line number at which code begins */
  const char *code;        /* The code executed when this rule is reduced */
  const char *codePrefix;  /* Setup code before code[] above */
  const char *codeSuffix;  /* Breakdown code after code[] above */
  struct symbol *precsym;  /* Precedence symbol for this rule */
  int index;               /* An index number for this rule */
  Boolean canReduce;       /* True if this rule is ever reduced */
  struct rule *nextlhs;    /* Next rule with the same LHS */
  struct rule *next;       /* Next rule in the global list */
};

................................................................................
  static char empty[1] = { 0 };
  static char *z = 0;
  static int alloced = 0;
  static int used = 0;
  int c;
  char zInt[40];
  if( zText==0 ){
    if( used==0 && z!=0 ) z[0] = 0;
    used = 0;
    return z;
  }
  if( n<=0 ){
    if( n<0 ){
      used += n;
      assert( used>=0 );
................................................................................
  return z;
}

/*
** zCode is a string that is the action associated with a rule.  Expand
** the symbols in this string so that the refer to elements of the parser
** stack.
**
** Return 1 if the expanded code requires that "yylhsminor" local variable
** to be defined.
*/
PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
  char *cp, *xp;
  int i;
  int rc = 0;            /* True if yylhsminor is used */
  int dontUseRhs0 = 0;   /* If true, use of left-most RHS label is illegal */
  const char *zSkip = 0; /* The zOvwrt comment within rp->code, or NULL */
  char lhsused = 0;      /* True if the LHS element has been used */
  char lhsdirect;        /* True if LHS writes directly into stack */
  char used[MAXRHS];     /* True for each RHS element which is used */
  char zLhs[50];         /* Convert the LHS symbol into this string */
  char zOvwrt[900];      /* Comment that to allow LHS to overwrite RHS */

  for(i=0; i<rp->nrhs; i++) used[i] = 0;
  lhsused = 0;

  if( rp->code==0 ){
    static char newlinestr[2] = { '\n', '\0' };
    rp->code = newlinestr;
    rp->line = rp->ruleline;
  }


  if( rp->lhsalias==0 ){
    /* There is no LHS value symbol. */
    lhsdirect = 1;
  }else if( rp->nrhs==0 ){
    /* If there are no RHS symbols, then writing directly to the LHS is ok */
    lhsdirect = 1;
  }else if( rp->rhsalias[0]==0 ){
    /* The left-most RHS symbol has not value.  LHS direct is ok.  But
    ** we have to call the distructor on the RHS symbol first. */
    lhsdirect = 1;
    if( has_destructor(rp->rhs[0],lemp) ){
      append_str(0,0,0,0);
      append_str("  yy_destructor(yypParser,%d,&yymsp[%d].minor);\n", 0,
                 rp->rhs[0]->index,1-rp->nrhs);
      rp->codePrefix = Strsafe(append_str(0,0,0,0));
    }
  }else if( strcmp(rp->lhsalias,rp->rhsalias[0])==0 ){
    /* The LHS symbol and the left-most RHS symbol are the same, so 
    ** direct writing is allowed */
    lhsdirect = 1;
    lhsused = 1;
    used[0] = 1;
    if( rp->lhs->dtnum!=rp->rhs[0]->dtnum ){
      ErrorMsg(lemp->filename,rp->ruleline,
        "%s(%s) and %s(%s) share the same label but have "
        "different datatypes.",
        rp->lhs->name, rp->lhsalias, rp->rhs[0]->name, rp->rhsalias[0]);
      lemp->errorcnt++;
    }    
  }else{
    lemon_sprintf(zOvwrt, "/*%s-overwrites-%s*/",
                  rp->lhsalias, rp->rhsalias[0]);
    zSkip = strstr(rp->code, zOvwrt);
    if( zSkip!=0 ){
      /* The code contains a special comment that indicates that it is safe
      ** for the LHS label to overwrite left-most RHS label. */
      lhsdirect = 1;
    }else{
      lhsdirect = 0;
    }
  }
  if( lhsdirect ){
    sprintf(zLhs, "yymsp[%d].minor.yy%d",1-rp->nrhs,rp->lhs->dtnum);
  }else{
    rc = 1;
    sprintf(zLhs, "yylhsminor.yy%d",rp->lhs->dtnum);
  }

  append_str(0,0,0,0);

  /* This const cast is wrong but harmless, if we're careful. */
  for(cp=(char *)rp->code; *cp; cp++){
    if( cp==zSkip ){
      append_str(zOvwrt,0,0,0);
      cp += lemonStrlen(zOvwrt)-1;
      dontUseRhs0 = 1;
      continue;
    }
    if( ISALPHA(*cp) && (cp==rp->code || (!ISALNUM(cp[-1]) && cp[-1]!='_')) ){
      char saved;
      for(xp= &cp[1]; ISALNUM(*xp) || *xp=='_'; xp++);
      saved = *xp;
      *xp = 0;
      if( rp->lhsalias && strcmp(cp,rp->lhsalias)==0 ){
        append_str(zLhs,0,0,0);
        cp = xp;
        lhsused = 1;
      }else{
        for(i=0; i<rp->nrhs; i++){
          if( rp->rhsalias[i] && strcmp(cp,rp->rhsalias[i])==0 ){
            if( i==0 && dontUseRhs0 ){
              ErrorMsg(lemp->filename,rp->ruleline,
                 "Label %s used after '%s'.",
                 rp->rhsalias[0], zOvwrt);
              lemp->errorcnt++;
            }else if( cp!=rp->code && cp[-1]=='@' ){
              /* If the argument is of the form @X then substituted
              ** the token number of X, not the value of X */
              append_str("yymsp[%d].major",-1,i-rp->nrhs+1,0);
            }else{
              struct symbol *sp = rp->rhs[i];
              int dtnum;
              if( sp->type==MULTITERMINAL ){
................................................................................
          }
        }
      }
      *xp = saved;
    }
    append_str(cp, 1, 0, 0);
  } /* End loop */

  /* Main code generation completed */
  cp = append_str(0,0,0,0);
  if( cp && cp[0] ) rp->code = Strsafe(cp);
  append_str(0,0,0,0);

  /* Check to make sure the LHS has been used */
  if( rp->lhsalias && !lhsused ){
    ErrorMsg(lemp->filename,rp->ruleline,
      "Label \"%s\" for \"%s(%s)\" is never used.",
        rp->lhsalias,rp->lhs->name,rp->lhsalias);
    lemp->errorcnt++;
  }

  /* Generate destructor code for RHS minor values which are not referenced.
  ** Generate error messages for unused labels and duplicate labels.
  */
  for(i=0; i<rp->nrhs; i++){
    if( rp->rhsalias[i] ){
      if( i>0 ){
        int j;
        if( rp->lhsalias && strcmp(rp->lhsalias,rp->rhsalias[i])==0 ){
          ErrorMsg(lemp->filename,rp->ruleline,
            "%s(%s) has the same label as the LHS but is not the left-most "
            "symbol on the RHS.",
            rp->rhs[i]->name, rp->rhsalias);
          lemp->errorcnt++;
        }
        for(j=0; j<i; j++){
          if( rp->rhsalias[j] && strcmp(rp->rhsalias[j],rp->rhsalias[i])==0 ){
            ErrorMsg(lemp->filename,rp->ruleline,
              "Label %s used for multiple symbols on the RHS of a rule.",
              rp->rhsalias[i]);
            lemp->errorcnt++;
            break;
          }
        }
      }
      if( !used[i] ){
        ErrorMsg(lemp->filename,rp->ruleline,
          "Label %s for \"%s(%s)\" is never used.",
          rp->rhsalias[i],rp->rhs[i]->name,rp->rhsalias[i]);
        lemp->errorcnt++;

      }
    }else if( i>0 && has_destructor(rp->rhs[i],lemp) ){
      append_str("  yy_destructor(yypParser,%d,&yymsp[%d].minor);\n", 0,
         rp->rhs[i]->index,i-rp->nrhs+1);


    }
  }


  /* If unable to write LHS values directly into the stack, write the
  ** saved LHS value now. */
  if( lhsdirect==0 ){
    append_str("  yymsp[%d].minor.yy%d = ", 0, 1-rp->nrhs, rp->lhs->dtnum);
    append_str(zLhs, 0, 0, 0);
    append_str(";\n", 0, 0, 0);
  }

  /* Suffix code generation complete */
  cp = append_str(0,0,0,0);
  if( cp ) rp->codeSuffix = Strsafe(cp);

  return rc;
}

/* 
** Generate code which executes when the rule "rp" is reduced.  Write
** the code to "out".  Make sure lineno stays up-to-date.
*/
PRIVATE void emit_code(
  FILE *out,
  struct rule *rp,
  struct lemon *lemp,
  int *lineno
){
 const char *cp;

 /* Setup code prior to the #line directive */
 if( rp->codePrefix && rp->codePrefix[0] ){
   fprintf(out, "{%s", rp->codePrefix);
   for(cp=rp->codePrefix; *cp; cp++){ if( *cp=='\n' ) (*lineno)++; }
 }

 /* Generate code to do the reduce action */
 if( rp->code ){
   if( !lemp->nolinenosflag ){
     (*lineno)++;
     tplt_linedir(out,rp->line,lemp->filename);
   }
   fprintf(out,"{%s",rp->code);
   for(cp=rp->code; *cp; cp++){ if( *cp=='\n' ) (*lineno)++; }


   fprintf(out,"}\n"); (*lineno)++;
   if( !lemp->nolinenosflag ){
     (*lineno)++;
     tplt_linedir(out,*lineno,lemp->outname);
   }
 }

 /* Generate breakdown code that occurs after the #line directive */
 if( rp->codeSuffix && rp->codeSuffix[0] ){
   fprintf(out, "%s", rp->codeSuffix);
   for(cp=rp->codeSuffix; *cp; cp++){ if( *cp=='\n' ) (*lineno)++; }
 }

 if( rp->codePrefix ){
   fprintf(out, "}\n"); (*lineno)++;
 }

 return;
}

/*
** Print the definition of the union used for the parser's data stack.
** This union contains fields for every possible data type for tokens
................................................................................
  */
  for(rp=lemp->rule; rp; rp=rp->next){
    fprintf(out,"  { %d, %d },\n",rp->lhs->index,rp->nrhs); lineno++;
  }
  tplt_xfer(lemp->name,in,out,&lineno);

  /* Generate code which execution during each REDUCE action */
  i = 0;
  for(rp=lemp->rule; rp; rp=rp->next){
    i += translate_code(lemp, rp);
  }
  if( i ){
    fprintf(out,"        YYMINORTYPE yylhsminor;\n"); lineno++;
  }
  /* First output rules other than the default: rule */
  for(rp=lemp->rule; rp; rp=rp->next){
    struct rule *rp2;               /* Other rules with the same action */
    if( rp->code==0 ) continue;
    if( rp->code[0]=='\n' && rp->code[1]==0 ) continue; /* Will be default: */
    fprintf(out,"      case %d: /* ", rp->index);

#ifndef INTERFACE
# define INTERFACE 1
#endif
/************* Begin control #defines *****************************************/
%%
/************* End control #defines *******************************************/

/* The yyzerominor constant is used to initialize instances of
** YYMINORTYPE objects to zero. */
static const YYMINORTYPE yyzerominor = { 0 };

/* Define the yytestcase() macro to be a no-op if is not already defined
** otherwise.
**
** Applications can choose to define yytestcase() in the %include section
** to a macro that can assist in verifying code coverage.  For production
** code the yytestcase() macro should be turned off.  But it is useful
** for testing.
................................................................................
/* The state of the parser is completely contained in an instance of
** the following structure */
struct yyParser {
  int yyidx;                    /* Index of top element in stack */
#ifdef YYTRACKMAXSTACKDEPTH
  int yyidxMax;                 /* Maximum value of yyidx */
#endif

  int yyerrcnt;                 /* Shifts left before out of the error */

  ParseARG_SDECL                /* A place to hold %extra_argument */
#if YYSTACKDEPTH<=0
  int yystksz;                  /* Current side of the stack */
  yyStackEntry *yystack;        /* The parser's stack */
#else
  yyStackEntry yystack[YYSTACKDEPTH];  /* The parser's stack */
#endif
................................................................................
#endif
  return yy_action[i];
}

/*
** The following routine is called if the stack overflows.
*/
static void yyStackOverflow(yyParser *yypParser, YYMINORTYPE *yypMinor){
   ParseARG_FETCH;
   yypParser->yyidx--;
#ifndef NDEBUG
   if( yyTraceFILE ){
     fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
   }
#endif
................................................................................
/*
** Perform a shift action.
*/
static void yy_shift(
  yyParser *yypParser,          /* The parser to be shifted */
  int yyNewState,               /* The new state to shift in */
  int yyMajor,                  /* The major token to shift in */
  YYMINORTYPE *yypMinor         /* Pointer to the minor token to shift in */
){
  yyStackEntry *yytos;
  yypParser->yyidx++;
#ifdef YYTRACKMAXSTACKDEPTH
  if( yypParser->yyidx>yypParser->yyidxMax ){
    yypParser->yyidxMax = yypParser->yyidx;
  }
#endif
#if YYSTACKDEPTH>0 
  if( yypParser->yyidx>=YYSTACKDEPTH ){
    yyStackOverflow(yypParser, yypMinor);
    return;
  }
#else
  if( yypParser->yyidx>=yypParser->yystksz ){
    yyGrowStack(yypParser);
    if( yypParser->yyidx>=yypParser->yystksz ){
      yyStackOverflow(yypParser, yypMinor);
      return;
    }
  }
#endif
  yytos = &yypParser->yystack[yypParser->yyidx];
  yytos->stateno = (YYACTIONTYPE)yyNewState;
  yytos->major = (YYCODETYPE)yyMajor;
  yytos->minor = *yypMinor;
  yyTraceShift(yypParser, yyNewState);
}

/* The following table contains information about every rule that
** is used during the reduce.
*/
static const struct {
................................................................................
*/
static void yy_reduce(
  yyParser *yypParser,         /* The parser */
  int yyruleno                 /* Number of the rule by which to reduce */
){
  int yygoto;                     /* The next state */
  int yyact;                      /* The next action */
  YYMINORTYPE yygotominor;        /* The LHS of the rule reduced */
  yyStackEntry *yymsp;            /* The top of the parser's stack */
  int yysize;                     /* Amount to pop the stack */
  ParseARG_FETCH;
  yymsp = &yypParser->yystack[yypParser->yyidx];
#ifndef NDEBUG
  if( yyTraceFILE && yyruleno>=0 
        && yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) ){
    yysize = yyRuleInfo[yyruleno].nrhs;
    fprintf(yyTraceFILE, "%sReduce [%s], go to state %d.\n", yyTracePrompt,
      yyRuleName[yyruleno], yymsp[-yysize].stateno);
  }
#endif /* NDEBUG */
  yygotominor = yyzerominor;


























  switch( yyruleno ){
  /* Beginning here are the reduction cases.  A typical example
  ** follows:
  **   case 0:
  **  #line <lineno> <grammarfile>
  **     {