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Diffstat (limited to 'src/sqlite/vdbe.h')
-rw-r--r-- | src/sqlite/vdbe.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/src/sqlite/vdbe.h b/src/sqlite/vdbe.h new file mode 100644 index 0000000..ff27df5 --- /dev/null +++ b/src/sqlite/vdbe.h @@ -0,0 +1,132 @@ +/* +** 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 1.1.1.1 2006/02/03 20:35:15 hoganrobert 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 { + u8 opcode; /* What operation to perform */ + int p1; /* First operand */ + int p2; /* Second parameter (often the jump destination) */ + char *p3; /* Third parameter */ + int p3type; /* One of the P3_xxx constants defined below */ +#ifdef VDBE_PROFILE + int cnt; /* Number of times this instruction was executed */ + long long cycles; /* Total time spend executing this instruction */ +#endif +}; +typedef struct VdbeOp VdbeOp; + +/* +** A smaller version of VdbeOp used for the VdbeAddOpList() function because +** it takes up less space. +*/ +struct VdbeOpList { + u8 opcode; /* What operation to perform */ + signed char p1; /* First operand */ + short int p2; /* Second parameter (often the jump destination) */ + char *p3; /* Third parameter */ +}; +typedef struct VdbeOpList VdbeOpList; + +/* +** 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 (-2) /* Pointer to a static string */ +#define P3_COLLSEQ (-4) /* P3 is a pointer to a CollSeq structure */ +#define P3_FUNCDEF (-5) /* P3 is a pointer to a FuncDef structure */ +#define P3_KEYINFO (-6) /* P3 is a pointer to a KeyInfo structure */ +#define P3_VDBEFUNC (-7) /* P3 is a pointer to a VdbeFunc structure */ +#define P3_MEM (-8) /* P3 is a pointer to a Mem* structure */ + +/* When adding a P3 argument using P3_KEYINFO, a copy of the KeyInfo structure +** is made. That copy is freed when the Vdbe is finalized. But if the +** argument is P3_KEYINFO_HANDOFF, the passed in pointer is used. It still +** gets freed when the Vdbe is finalized so it still should be obtained +** from a single sqliteMalloc(). But no copy is made and the calling +** function should *not* try to free the KeyInfo. +*/ +#define P3_KEYINFO_HANDOFF (-9) + +/* +** The following macro converts a relative address in the p2 field +** of a VdbeOp structure into a negative number so that +** sqlite3VdbeAddOpList() knows that the address is relative. Calling +** the macro again restores the address. +*/ +#define ADDR(X) (-1-(X)) + +/* +** The makefile scans the vdbe.c source file and creates the "opcodes.h" +** header file that defines a number for each opcode used by the VDBE. +*/ +#include "opcodes.h" + +/* +** Prototypes for the VDBE interface. See comments on the implementation +** for a description of what each of these routines does. +*/ +Vdbe *sqlite3VdbeCreate(sqlite3*); +void sqlite3VdbeCreateCallback(Vdbe*, int*); +int sqlite3VdbeAddOp(Vdbe*,int,int,int); +int sqlite3VdbeOp3(Vdbe*,int,int,int,const char *zP3,int); +int sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp); +void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1); +void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2); +void sqlite3VdbeChangeP3(Vdbe*, int addr, const char *zP1, int N); +void sqlite3VdbeDequoteP3(Vdbe*, int addr); +int sqlite3VdbeFindOp(Vdbe*, int, int, int); +VdbeOp *sqlite3VdbeGetOp(Vdbe*, int); +int sqlite3VdbeMakeLabel(Vdbe*); +void sqlite3VdbeDelete(Vdbe*); +void sqlite3VdbeMakeReady(Vdbe*,int,int,int,int,int); +int sqlite3VdbeFinalize(Vdbe*); +void sqlite3VdbeResolveLabel(Vdbe*, int); +int sqlite3VdbeCurrentAddr(Vdbe*); +void sqlite3VdbeTrace(Vdbe*,FILE*); +int sqlite3VdbeReset(Vdbe*); +int sqliteVdbeSetVariables(Vdbe*,int,const char**); +void sqlite3VdbeSetNumCols(Vdbe*,int); +int sqlite3VdbeSetColName(Vdbe*, int, const char *, int); +void sqlite3VdbeCountChanges(Vdbe*); +sqlite3 *sqlite3VdbeDb(Vdbe*); + +#ifndef NDEBUG + void sqlite3VdbeComment(Vdbe*, const char*, ...); +# define VdbeComment(X) sqlite3VdbeComment X +#else +# define VdbeComment(X) +#endif + +#endif |