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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 1.43 2002/02/19 15:00:08 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_Last               28
#define OP_Rewind             29
#define OP_Next               30

#define OP_Destroy            31
#define OP_Clear              32
#define OP_CreateIndex        33
#define OP_CreateTable        34
#define OP_IntegrityCk        35

#define OP_IdxPut             36
#define OP_IdxDelete          37
#define OP_IdxRecno           38
#define OP_IdxGT              39
#define OP_IdxGE              40

#define OP_MemLoad            41
#define OP_MemStore           42

#define OP_ListWrite          43
#define OP_ListRewind         44
#define OP_ListRead           45
#define OP_ListReset          46

#define OP_SortPut            47
#define OP_SortMakeRec        48
#define OP_SortMakeKey        49
#define OP_Sort               50
#define OP_SortNext           51
#define OP_SortCallback       52
#define OP_SortReset          53

#define OP_FileOpen           54
#define OP_FileRead           55
#define OP_FileColumn         56

#define OP_AggReset           57
#define OP_AggFocus           58
#define OP_AggIncr            59
#define OP_AggNext            60
#define OP_AggSet             61
#define OP_AggGet             62

#define OP_SetInsert          63
#define OP_SetFound           64
#define OP_SetNotFound        65

#define OP_MakeRecord         66
#define OP_MakeKey            67
#define OP_MakeIdxKey         68
#define OP_IncrKey            69

#define OP_Goto               70
#define OP_If                 71
#define OP_Halt               72

#define OP_ColumnCount        73
#define OP_ColumnName         74
#define OP_Callback           75
#define OP_NullCallback       76

#define OP_Integer            77
#define OP_String             78
#define OP_Pop                79
#define OP_Dup                80
#define OP_Pull               81
#define OP_Push               82
#define OP_MustBeInt          83

#define OP_Add                84
#define OP_AddImm             85
#define OP_Subtract           86
#define OP_Multiply           87
#define OP_Divide             88
#define OP_Remainder          89
#define OP_BitAnd             90
#define OP_BitOr              91
#define OP_BitNot             92
#define OP_ShiftLeft          93
#define OP_ShiftRight         94
#define OP_AbsValue           95
#define OP_Precision          96
#define OP_Min                97
#define OP_Max                98
#define OP_Like               99
#define OP_Glob              100
#define OP_Eq                101
#define OP_Ne                102
#define OP_Lt                103
#define OP_Le                104
#define OP_Gt                105
#define OP_Ge                106
#define OP_IsNull            107
#define OP_NotNull           108
#define OP_Negative          109
#define OP_And               110
#define OP_Or                111
#define OP_Not               112
#define OP_Concat            113
#define OP_Noop              114

#define OP_Strlen            115
#define OP_Substr            116

#define OP_Limit             117

#define OP_MAX               117

/*
** 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