SQLite4  Check-in [035df9b1de]

**
** (Historical note:  There used to be several other options, but we've
** pared it down to just these three.)
**
** If none of the above are defined, then set SQLITE4_SYSTEM_MALLOC as
** the default.
*/
#if defined(SQLITE4_SYSTEM_MALLOC)+defined(SQLITE4_WIN32_MALLOC)+defined(SQLITE4_MEMDEBUG)>1

# error "At most one of the following compile-time configuration options\
 is allows: SQLITE4_SYSTEM_MALLOC, SQLITE4_WIN32_MALLOC, SQLITE4_MEMDEBUG"
#endif
#if defined(SQLITE4_SYSTEM_MALLOC)+defined(SQLITE4_WIN32_MALLOC)+defined(SQLITE4_MEMDEBUG)==0

# define SQLITE4_SYSTEM_MALLOC 1
#endif

/*
** If SQLITE4_MALLOC_SOFT_LIMIT is not zero, then try to keep the
** sizes of memory allocations below this value where possible.
*/

** Later we learn that _XOPEN_SOURCE is poorly or incorrectly
** implemented on some systems.  So we avoid defining it at all
** if it is already defined or if it is unneeded because we are
** not doing a threadsafe build.  Ticket #2681.
**
** See also ticket #2741.
*/
#if !defined(_XOPEN_SOURCE) && !defined(__DARWIN__) && !defined(__APPLE__) && SQLITE4_THREADSAFE

#  define _XOPEN_SOURCE 500  /* Needed to enable pthread recursive mutexes */
#endif

/*
** The TCL headers are only needed when compiling the TCL bindings.
*/
#if defined(SQLITE4_TCL) || defined(TCLSH)

#define SQLITE4_VdbeAddopTrace 0x00001000  /* Trace sqlite4VdbeAddOp() calls */
#define SQLITE4_InternChanges  0x00010000  /* Uncommitted Hash table changes */
#define SQLITE4_WriteSchema    0x00020000  /* OK to update SQLITE4_MASTER */
#define SQLITE4_IgnoreChecks   0x00040000  /* Dont enforce check constraints */
#define SQLITE4_RecoveryMode   0x00080000  /* Ignore schema errors */
#define SQLITE4_ReverseOrder   0x01000000  /* Reverse unordered SELECTs */
#define SQLITE4_RecTriggers    0x02000000  /* Enable recursive triggers */
#define SQLITE4_ForeignKeys    0x04000000  /* Enforce foreign key constraints  */
#define SQLITE4_AutoIndex      0x08000000  /* Enable automatic indexes */
#define SQLITE4_PreferBuiltin  0x10000000  /* Preference to built-in funcs */
#define SQLITE4_EnableTrigger  0x40000000  /* True to enable triggers */

/*
** Bits of the sqlite4.flags field that are used by the
** sqlite4_test_control(SQLITE4_TESTCTRL_OPTIMIZATIONS,...) interface.
** These must be the low-order bits of the flags field.
*/
#define SQLITE4_QueryFlattener 0x01        /* Disable query flattening */
#define SQLITE4_ColumnCache    0x02        /* Disable the column cache */
#define SQLITE4_IndexSort      0x04        /* Disable indexes for sorting */
#define SQLITE4_IndexSearch    0x08        /* Disable indexes for searching */
#define SQLITE4_IndexCover     0x10        /* Disable index covering table */
#define SQLITE4_GroupByOrder   0x20        /* Disable GROUPBY cover of ORDERBY */
#define SQLITE4_FactorOutConst 0x40        /* Disable factoring out constants */
#define SQLITE4_IdxRealAsInt   0x80        /* Store REAL as INT in indices */
#define SQLITE4_DistinctOpt    0x80        /* DISTINCT using indexes */
#define SQLITE4_OptMask        0xff        /* Mask of all disablable opts */

/*
** Possible values for the sqlite.magic field.
** The numbers are obtained at random and have no special meaning, other
** than being distinct from one another.
*/
#define SQLITE4_MAGIC_OPEN     0xa029a697  /* Database is open */
#define SQLITE4_MAGIC_CLOSED   0x9f3c2d33  /* Database is closed */
#define SQLITE4_MAGIC_SICK     0x4b771290  /* Error and awaiting close */
#define SQLITE4_MAGIC_BUSY     0xf03b7906  /* Database currently in use */
#define SQLITE4_MAGIC_ERROR    0xb5357930  /* An SQLITE4_MISUSE error occurred */

/*
** 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

*/
#define SQLITE4_FUNC_LIKE     0x01 /* Candidate for the LIKE optimization */
#define SQLITE4_FUNC_CASE     0x02 /* Case-sensitive LIKE-type function */
#define SQLITE4_FUNC_EPHEM    0x04 /* Ephemeral.  Delete with VDBE */
#define SQLITE4_FUNC_NEEDCOLL 0x08 /* sqlite4GetFuncCollSeq() might be called */
#define SQLITE4_FUNC_PRIVATE  0x10 /* Allowed for internal use only */
#define SQLITE4_FUNC_COUNT    0x20 /* Built-in count(*) aggregate */
#define SQLITE4_FUNC_COALESCE 0x40 /* Built-in coalesce() or ifnull() function */

/*
** 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 

*/
#define SQLITE4_AFF_MASK     0x67

/*
** Additional bit values that can be ORed with an affinity without
** changing the affinity.
*/
#define SQLITE4_JUMPIFNULL   0x08  /* jumps if either operand is NULL */
#define SQLITE4_STOREP2      0x10  /* Store result in reg[P2] rather than jump */
#define SQLITE4_NULLEQ       0x80  /* NULL=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 (sqlite4*) that uses the shared

  int nOnce;           /* Number of OP_Once instructions so far */
  int ckBase;          /* Base register of data during check constraints */
  int iCacheLevel;     /* ColCache valid when aColCache[].iLevel<=iCacheLevel */
  int iCacheCnt;       /* Counter used to generate aColCache[].lru values */
  int iNewidxReg;      /* First argument to OP_NewIdxid */
  u8 nColCache;        /* Number of entries in aColCache[] */
  u8 iColCache;        /* Next entry in aColCache[] to replace */
  ParseYColCache aColCache[SQLITE4_N_COLCACHE]; /* One for each column cache entry */
  yDbMask writeMask;   /* Start a write transaction on these databases */
  yDbMask cookieMask;  /* Bitmask of schema verified databases */
  u8 isMultiWrite;     /* True if statement may affect/insert multiple rows */
  u8 mayAbort;         /* True if statement may throw an ABORT exception */
  int cookieGoto;      /* Address of OP_Goto to cookie verifier subroutine */
  int cookieValue[SQLITE4_MAX_ATTACHED+2];  /* Values of cookies to verify */
  int regRowid;        /* Register holding rowid of CREATE TABLE entry */

int sqlite4Select(Parse*, Select*, SelectDest*);
Select *sqlite4SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*,
                         Expr*,ExprList*,int,Expr*,Expr*);
void sqlite4SelectDelete(sqlite4*, Select*);
Table *sqlite4SrcListLookup(Parse*, SrcList*);
int sqlite4IsReadOnly(Parse*, Table*, int);
void sqlite4OpenTable(Parse*, int iCur, int iDb, Table*, int);
#if defined(SQLITE4_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE4_OMIT_SUBQUERY)

Expr *sqlite4LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *, char *);
#endif
void sqlite4DeleteFrom(Parse*, SrcList*, Expr*);
void sqlite4Update(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqlite4WhereBegin(Parse*, SrcList*, Expr*, ExprList**,ExprList*,u16);
void sqlite4WhereEnd(WhereInfo*);
int sqlite4ExprCodeGetColumn(Parse*, Table*, int, int, int);
void sqlite4ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);

**     x = sqlite4GetVarint32( A, &B );
**     x = sqlite4PutVarint32( A, B );
**
**     x = getVarint32( A, B );
**     x = putVarint32( A, B );
**
*/
#define getVarint32(A,B)  (u8)((*(A)<(u8)0x80) ? ((B) = (u32)*(A)),1 : sqlite4GetVarint32((A), (u32 *)&(B)))

#define putVarint32(A,B)  (u8)(((u32)(B)<(u32)0x80) ? (*(A) = (unsigned char)(B)),1 : sqlite4PutVarint32((A), (B)))


#define getVarint    sqlite4GetVarint
#define putVarint    sqlite4PutVarint


const char *sqlite4IndexAffinityStr(Vdbe *, Index *);
void sqlite4TableAffinityStr(Vdbe *, Table *);
char sqlite4CompareAffinity(Expr *pExpr, char aff2);