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145 lines
5.1 KiB
C
145 lines
5.1 KiB
C
/*
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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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** $Id$
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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; /* One of the P3_xxx constants defined below */
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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_COLLSEQ (-4) /* P3 is a pointer to a CollSeq structure */
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#define P3_FUNCDEF (-5) /* P3 is a pointer to a FuncDef structure */
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#define P3_KEYINFO (-6) /* P3 is a pointer to a KeyInfo structure */
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#define P3_VDBEFUNC (-7) /* P3 is a pointer to a VdbeFunc structure */
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#define P3_MEM (-8) /* P3 is a pointer to a Mem* structure */
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#define P3_TRANSIENT (-9) /* P3 is a pointer to a transient string */
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/* When adding a P3 argument using P3_KEYINFO, a copy of the KeyInfo structure
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** is made. That copy is freed when the Vdbe is finalized. But if the
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** argument is P3_KEYINFO_HANDOFF, the passed in pointer is used. It still
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** gets freed when the Vdbe is finalized so it still should be obtained
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** from a single sqliteMalloc(). But no copy is made and the calling
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** function should *not* try to free the KeyInfo.
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*/
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#define P3_KEYINFO_HANDOFF (-9)
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/*
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** The Vdbe.aColName array contains 5n Mem structures, where n is the
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** number of columns of data returned by the statement.
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*/
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#define COLNAME_NAME 0
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#define COLNAME_DECLTYPE 1
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#define COLNAME_DATABASE 2
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#define COLNAME_TABLE 3
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#define COLNAME_COLUMN 4
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#define COLNAME_N 5 /* Number of COLNAME_xxx symbols */
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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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** sqlite3VdbeAddOpList() 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 *sqlite3VdbeCreate(sqlite3*);
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void sqlite3VdbeCreateCallback(Vdbe*, int*);
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int sqlite3VdbeAddOp(Vdbe*,int,int,int);
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int sqlite3VdbeOp3(Vdbe*,int,int,int,const char *zP3,int);
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int sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp);
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void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1);
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void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2);
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void sqlite3VdbeJumpHere(Vdbe*, int addr);
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void sqlite3VdbeChangeToNoop(Vdbe*, int addr, int N);
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void sqlite3VdbeChangeP3(Vdbe*, int addr, const char *zP1, int N);
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VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
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int sqlite3VdbeMakeLabel(Vdbe*);
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void sqlite3VdbeDelete(Vdbe*);
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void sqlite3VdbeMakeReady(Vdbe*,int,int,int,int);
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int sqlite3VdbeFinalize(Vdbe*);
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void sqlite3VdbeResolveLabel(Vdbe*, int);
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int sqlite3VdbeCurrentAddr(Vdbe*);
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void sqlite3VdbeTrace(Vdbe*,FILE*);
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int sqlite3VdbeReset(Vdbe*);
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int sqliteVdbeSetVariables(Vdbe*,int,const char**);
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void sqlite3VdbeSetNumCols(Vdbe*,int);
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int sqlite3VdbeSetColName(Vdbe*, int, int, const char *, int);
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void sqlite3VdbeCountChanges(Vdbe*);
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sqlite3 *sqlite3VdbeDb(Vdbe*);
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#ifndef NDEBUG
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void sqlite3VdbeComment(Vdbe*, const char*, ...);
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# define VdbeComment(X) sqlite3VdbeComment X
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#else
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# define VdbeComment(X)
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#endif
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#endif
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