/*
** 2001 September 15
**
** 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.
**
*************************************************************************
** Header file for the Virtual DataBase Engine (VDBE)
**
** This header defines the interface to the virtual database engine
** or VDBE.  The VDBE implements an abstract machine that runs a
** simple program to access and modify the underlying database.
**
** $Id: vdbe.h,v 1.36 2001/11/08 00:45:22 drh Exp $
*/
#ifndef _SQLITE_VDBE_H_
#define _SQLITE_VDBE_H_
#include <stdio.h>

/*
** A single VDBE is an opaque structure named "Vdbe".  Only routines
** in the source file sqliteVdbe.c are allowed to see the insides
** of this structure.
*/
typedef struct Vdbe Vdbe;

/*
** A single instruction of the virtual machine has an opcode
** and as many as three operands.  The instruction is recorded
** as an instance of the following structure:
*/
struct VdbeOp {
  int opcode;         /* What operation to perform */
  int p1;             /* First operand */
  int p2;             /* Second parameter (often the jump destination) */
  char *p3;           /* Third parameter */
  int p3type;         /* P3_STATIC, P3_DYNAMIC or P3_POINTER */
};
typedef struct VdbeOp VdbeOp;

/*
** Allowed values of VdbeOp.p3type
*/
#define P3_NOTUSED    0   /* The P3 parameter is not used */
#define P3_DYNAMIC    1   /* Pointer to a string obtained from sqliteMalloc() */
#define P3_STATIC   (-1)  /* Pointer to a static string */
#define P3_POINTER  (-2)  /* P3 is a pointer to some structure or object */

/*
** The following macro converts a relative address in the p2 field
** of a VdbeOp structure into a negative number so that 
** sqliteVdbeAddOpList() knows that the address is relative.  Calling
** the macro again restores the address.
*/
#define ADDR(X)  (-1-(X))

/*
** These are the available opcodes.
**
** If any of the values changes or if opcodes are added or removed,
** be sure to also update the zOpName[] array in sqliteVdbe.c to
** mirror the change.
**
** The source tree contains an AWK script named renumberOps.awk that
** can be used to renumber these opcodes when new opcodes are inserted.
*/
#define OP_Transaction         1
#define OP_Commit              2
#define OP_Rollback            3

#define OP_ReadCookie          4
#define OP_SetCookie           5
#define OP_VerifyCookie        6

#define OP_Open                7
#define OP_OpenTemp            8
#define OP_OpenWrite           9
#define OP_OpenAux            10
#define OP_OpenWrAux          11
#define OP_Close              12
#define OP_MoveTo             13
#define OP_NewRecno           14
#define OP_Put                15
#define OP_Distinct           16
#define OP_Found              17
#define OP_NotFound           18
#define OP_Delete             19
#define OP_Column             20
#define OP_KeyAsData          21
#define OP_Recno              22
#define OP_FullKey            23
#define OP_Rewind             24
#define OP_Next               25

#define OP_Destroy            26
#define OP_Clear              27
#define OP_CreateIndex        28
#define OP_CreateTable        29
#define OP_Reorganize         30

#define OP_IdxPut             31
#define OP_IdxDelete          32
#define OP_IdxRecno           33
#define OP_IdxGT              34
#define OP_IdxGE              35

#define OP_MemLoad            36
#define OP_MemStore           37

#define OP_ListWrite          38
#define OP_ListRewind         39
#define OP_ListRead           40
#define OP_ListReset          41

#define OP_SortPut            42
#define OP_SortMakeRec        43
#define OP_SortMakeKey        44
#define OP_Sort               45
#define OP_SortNext           46
#define OP_SortCallback       47
#define OP_SortReset          48

#define OP_FileOpen           49
#define OP_FileRead           50
#define OP_FileColumn         51

#define OP_AggReset           52
#define OP_AggFocus           53
#define OP_AggIncr            54
#define OP_AggNext            55
#define OP_AggSet             56
#define OP_AggGet             57

#define OP_SetInsert          58
#define OP_SetFound           59
#define OP_SetNotFound        60

#define OP_MakeRecord         61
#define OP_MakeKey            62
#define OP_MakeIdxKey         63
#define OP_IncrKey            64

#define OP_Goto               65
#define OP_If                 66
#define OP_Halt               67

#define OP_ColumnCount        68
#define OP_ColumnName         69
#define OP_Callback           70
#define OP_NullCallback       71

#define OP_Integer            72
#define OP_String             73
#define OP_Pop                74
#define OP_Dup                75
#define OP_Pull               76

#define OP_Add                77
#define OP_AddImm             78
#define OP_Subtract           79
#define OP_Multiply           80
#define OP_Divide             81
#define OP_Remainder          82
#define OP_BitAnd             83
#define OP_BitOr              84
#define OP_BitNot             85
#define OP_ShiftLeft          86
#define OP_ShiftRight         87
#define OP_AbsValue           88
#define OP_Precision          89
#define OP_Min                90
#define OP_Max                91
#define OP_Like               92
#define OP_Glob               93
#define OP_Eq                 94
#define OP_Ne                 95
#define OP_Lt                 96
#define OP_Le                 97
#define OP_Gt                 98
#define OP_Ge                 99
#define OP_IsNull            100
#define OP_NotNull           101
#define OP_Negative          102
#define OP_And               103
#define OP_Or                104
#define OP_Not               105
#define OP_Concat            106
#define OP_Noop              107

#define OP_Strlen            108
#define OP_Substr            109

#define OP_Limit             110

#define OP_MAX               110

/*
** Prototypes for the VDBE interface.  See comments on the implementation
** for a description of what each of these routines does.
*/
Vdbe *sqliteVdbeCreate(sqlite*);
void sqliteVdbeCreateCallback(Vdbe*, int*);
int sqliteVdbeAddOp(Vdbe*,int,int,int);
int sqliteVdbeAddOpList(Vdbe*, int nOp, VdbeOp const *aOp);
void sqliteVdbeChangeP1(Vdbe*, int addr, int P1);
void sqliteVdbeChangeP3(Vdbe*, int addr, const char *zP1, int N);
void sqliteVdbeDequoteP3(Vdbe*, int addr);
int sqliteVdbeMakeLabel(Vdbe*);
void sqliteVdbeDelete(Vdbe*);
int sqliteVdbeOpcode(const char *zName);
int sqliteVdbeExec(Vdbe*,sqlite_callback,void*,char**,void*,
                   int(*)(void*,const char*,int));
int sqliteVdbeList(Vdbe*,sqlite_callback,void*,char**);
void sqliteVdbeResolveLabel(Vdbe*, int);
int sqliteVdbeCurrentAddr(Vdbe*);
void sqliteVdbeTrace(Vdbe*,FILE*);
void sqliteVdbeCompressSpace(Vdbe*,int);

#endif