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/*
** 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 1.57 2002/06/21 23:01:50 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_Checkpoint          2
#define OP_Commit              3
#define OP_Rollback            4

#define OP_ReadCookie          5
#define OP_SetCookie           6
#define OP_VerifyCookie        7

#define OP_Open                8
#define OP_OpenTemp            9
#define OP_OpenWrite          10
#define OP_OpenAux            11
#define OP_OpenWrAux          12
#define OP_Close              13
#define OP_MoveTo             14
#define OP_NewRecno           15
#define OP_PutIntKey          16
#define OP_PutStrKey          17
#define OP_Distinct           18
#define OP_Found              19
#define OP_NotFound           20
#define OP_IsUnique           21
#define OP_NotExists          22
#define OP_Delete             23
#define OP_Column             24
#define OP_KeyAsData          25
#define OP_Recno              26
#define OP_FullKey            27
#define OP_NullRow            28
#define OP_Last               29
#define OP_Rewind             30
#define OP_Next               31

#define OP_Destroy            32
#define OP_Clear              33
#define OP_CreateIndex        34
#define OP_CreateTable        35
#define OP_IntegrityCk        36

#define OP_IdxPut             37
#define OP_IdxDelete          38
#define OP_IdxRecno           39
#define OP_IdxGT              40
#define OP_IdxGE              41

#define OP_MemLoad            42
#define OP_MemStore           43
#define OP_MemIncr            44

#define OP_ListWrite          45
#define OP_ListRewind         46
#define OP_ListRead           47
#define OP_ListReset          48
#define OP_ListPush           49
#define OP_ListPop            50

#define OP_SortPut            51
#define OP_SortMakeRec        52
#define OP_SortMakeKey        53
#define OP_Sort               54
#define OP_SortNext           55
#define OP_SortCallback       56
#define OP_SortReset          57

#define OP_FileOpen           58
#define OP_FileRead           59
#define OP_FileColumn         60

#define OP_AggReset           61
#define OP_AggFocus           62
#define OP_AggNext            63
#define OP_AggSet             64
#define OP_AggGet             65
#define OP_AggFunc            66
#define OP_AggInit            67
#define OP_AggPush            68
#define OP_AggPop             69

#define OP_SetInsert          70
#define OP_SetFound           71
#define OP_SetNotFound        72
#define OP_SetFirst           73
#define OP_SetNext            74

#define OP_MakeRecord         75
#define OP_MakeKey            76
#define OP_MakeIdxKey         77
#define OP_IncrKey            78

#define OP_Goto               79
#define OP_If                 80
#define OP_IfNot              81
#define OP_Halt               82

#define OP_ColumnCount        83
#define OP_ColumnName         84
#define OP_Callback           85
#define OP_NullCallback       86

#define OP_Integer            87
#define OP_String             88
#define OP_Pop                89
#define OP_Dup                90
#define OP_Pull               91
#define OP_Push               92
#define OP_MustBeInt          93

#define OP_Add                94
#define OP_AddImm             95
#define OP_Subtract           96
#define OP_Multiply           97
#define OP_Divide             98
#define OP_Remainder          99
#define OP_BitAnd            100
#define OP_BitOr             101
#define OP_BitNot            102
#define OP_ShiftLeft         103
#define OP_ShiftRight        104
#define OP_AbsValue          105

/* Note: The code generator assumes that OP_XX+6==OP_StrXX */
#define OP_Eq                106
#define OP_Ne                107
#define OP_Lt                108
#define OP_Le                109
#define OP_Gt                110
#define OP_Ge                111
#define OP_StrEq             112
#define OP_StrNe             113
#define OP_StrLt             114
#define OP_StrLe             115
#define OP_StrGt             116
#define OP_StrGe             117
/* Note: the code generator assumes that OP_XX+6==OP_StrXX */

#define OP_IsNull            118
#define OP_NotNull           119
#define OP_Negative          120
#define OP_And               121
#define OP_Or                122
#define OP_Not               123
#define OP_Concat            124
#define OP_Noop              125
#define OP_Function          126

#define OP_MAX               126

/*
** 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 sqliteVdbeChangeP2(Vdbe*, int addr, int P2);
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