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113 lines
3.8 KiB
113 lines
3.8 KiB
/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** Header file for the Virtual DataBase Engine (VDBE)
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**
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** This header defines the interface to the virtual database engine
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** or VDBE. The VDBE implements an abstract machine that runs a
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** simple program to access and modify the underlying database.
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**
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** $Id: vdbe.h,v 1.71 2004/02/22 20:05:02 drh Exp $
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*/
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#ifndef _SQLITE_VDBE_H_
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#define _SQLITE_VDBE_H_
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#include <stdio.h>
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/*
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** A single VDBE is an opaque structure named "Vdbe". Only routines
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** in the source file sqliteVdbe.c are allowed to see the insides
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** of this structure.
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*/
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typedef struct Vdbe Vdbe;
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/*
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** A single instruction of the virtual machine has an opcode
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** and as many as three operands. The instruction is recorded
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** as an instance of the following structure:
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*/
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struct VdbeOp {
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u8 opcode; /* What operation to perform */
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int p1; /* First operand */
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int p2; /* Second parameter (often the jump destination) */
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char *p3; /* Third parameter */
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int p3type; /* P3_STATIC, P3_DYNAMIC or P3_POINTER */
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#ifdef VDBE_PROFILE
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int cnt; /* Number of times this instruction was executed */
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long long cycles; /* Total time spend executing this instruction */
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#endif
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};
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typedef struct VdbeOp VdbeOp;
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/*
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** A smaller version of VdbeOp used for the VdbeAddOpList() function because
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** it takes up less space.
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*/
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struct VdbeOpList {
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u8 opcode; /* What operation to perform */
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signed char p1; /* First operand */
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short int p2; /* Second parameter (often the jump destination) */
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char *p3; /* Third parameter */
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};
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typedef struct VdbeOpList VdbeOpList;
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/*
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** Allowed values of VdbeOp.p3type
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*/
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#define P3_NOTUSED 0 /* The P3 parameter is not used */
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#define P3_DYNAMIC (-1) /* Pointer to a string obtained from sqliteMalloc() */
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#define P3_STATIC (-2) /* Pointer to a static string */
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#define P3_POINTER (-3) /* P3 is a pointer to some structure or object */
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/*
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** The following macro converts a relative address in the p2 field
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** of a VdbeOp structure into a negative number so that
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** sqliteVdbeAddOpList() knows that the address is relative. Calling
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** the macro again restores the address.
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*/
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#define ADDR(X) (-1-(X))
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/*
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** The makefile scans the vdbe.c source file and creates the "opcodes.h"
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** header file that defines a number for each opcode used by the VDBE.
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*/
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#include "opcodes.h"
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/*
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** Prototypes for the VDBE interface. See comments on the implementation
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** for a description of what each of these routines does.
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*/
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Vdbe *sqliteVdbeCreate(sqlite*);
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void sqliteVdbeCreateCallback(Vdbe*, int*);
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int sqliteVdbeAddOp(Vdbe*,int,int,int);
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int sqliteVdbeOp3(Vdbe*,int,int,int,const char *zP3,int);
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int sqliteVdbeCode(Vdbe*,...);
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int sqliteVdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp);
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void sqliteVdbeChangeP1(Vdbe*, int addr, int P1);
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void sqliteVdbeChangeP2(Vdbe*, int addr, int P2);
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void sqliteVdbeChangeP3(Vdbe*, int addr, const char *zP1, int N);
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void sqliteVdbeDequoteP3(Vdbe*, int addr);
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int sqliteVdbeFindOp(Vdbe*, int, int);
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VdbeOp *sqliteVdbeGetOp(Vdbe*, int);
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int sqliteVdbeMakeLabel(Vdbe*);
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void sqliteVdbeDelete(Vdbe*);
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void sqliteVdbeMakeReady(Vdbe*,int,int);
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int sqliteVdbeExec(Vdbe*);
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int sqliteVdbeList(Vdbe*);
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int sqliteVdbeFinalize(Vdbe*,char**);
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void sqliteVdbeResolveLabel(Vdbe*, int);
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int sqliteVdbeCurrentAddr(Vdbe*);
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void sqliteVdbeTrace(Vdbe*,FILE*);
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void sqliteVdbeCompressSpace(Vdbe*,int);
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int sqliteVdbeReset(Vdbe*,char **);
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int sqliteVdbeSetVariables(Vdbe*,int,const char**);
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#endif
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