persistentstorage/sql/SQLite/vdbe.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 11:06:30 +0200
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/*
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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 1.135 2008/08/01 20:10:08 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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** The names of the following types declared in vdbeInt.h are required
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** for the VdbeOp definition.
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*/
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typedef struct VdbeFunc VdbeFunc;
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typedef struct Mem Mem;
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typedef struct UnpackedRecord UnpackedRecord;
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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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  signed char p4type; /* One of the P4_xxx constants for p4 */
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  u8 opflags;         /* Not currently used */
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  u8 p5;              /* Fifth parameter is an unsigned character */
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  int p1;             /* First operand */
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  int p2;             /* Second parameter (often the jump destination) */
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  int p3;             /* The third parameter */
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  union {             /* forth parameter */
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    int i;                 /* Integer value if p4type==P4_INT32 */
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    void *p;               /* Generic pointer */
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    char *z;               /* Pointer to data for string (char array) types */
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    i64 *pI64;             /* Used when p4type is P4_INT64 */
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    double *pReal;         /* Used when p4type is P4_REAL */
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    FuncDef *pFunc;        /* Used when p4type is P4_FUNCDEF */
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    VdbeFunc *pVdbeFunc;   /* Used when p4type is P4_VDBEFUNC */
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    CollSeq *pColl;        /* Used when p4type is P4_COLLSEQ */
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    Mem *pMem;             /* Used when p4type is P4_MEM */
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    sqlite3_vtab *pVtab;   /* Used when p4type is P4_VTAB */
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    KeyInfo *pKeyInfo;     /* Used when p4type is P4_KEYINFO */
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    int *ai;               /* Used when p4type is P4_INTARRAY */
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  } p4;
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#ifdef SQLITE_DEBUG
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  char *zComment;          /* Comment to improve readability */
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#endif
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#ifdef VDBE_PROFILE
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  int cnt;                 /* Number of times this instruction was executed */
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  u64 cycles;              /* Total time spent 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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  signed char p2;     /* Second parameter (often the jump destination) */
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  signed 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 P4_NOTUSED    0   /* The P4 parameter is not used */
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#define P4_DYNAMIC  (-1)  /* Pointer to a string obtained from sqliteMalloc() */
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#define P4_STATIC   (-2)  /* Pointer to a static string */
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#define P4_COLLSEQ  (-4)  /* P4 is a pointer to a CollSeq structure */
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#define P4_FUNCDEF  (-5)  /* P4 is a pointer to a FuncDef structure */
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#define P4_KEYINFO  (-6)  /* P4 is a pointer to a KeyInfo structure */
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#define P4_VDBEFUNC (-7)  /* P4 is a pointer to a VdbeFunc structure */
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#define P4_MEM      (-8)  /* P4 is a pointer to a Mem*    structure */
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#define P4_TRANSIENT (-9) /* P4 is a pointer to a transient string */
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#define P4_VTAB     (-10) /* P4 is a pointer to an sqlite3_vtab structure */
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#define P4_MPRINTF  (-11) /* P4 is a string obtained from sqlite3_mprintf() */
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#define P4_REAL     (-12) /* P4 is a 64-bit floating point value */
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#define P4_INT64    (-13) /* P4 is a 64-bit signed integer */
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#define P4_INT32    (-14) /* P4 is a 32-bit signed integer */
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#define P4_INTARRAY (-15) /* P4 is a vector of 32-bit integers */
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/* When adding a P4 argument using P4_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 P4_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 P4_KEYINFO_HANDOFF (-16)
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#define P4_KEYINFO_STATIC  (-17)
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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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#ifdef SQLITE_ENABLE_COLUMN_METADATA
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# define COLNAME_N        5      /* Number of COLNAME_xxx symbols */
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#else
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# ifdef SQLITE_OMIT_DECLTYPE
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#   define COLNAME_N      1      /* Store only the name */
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# else
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#   define COLNAME_N      2      /* Store the name and decltype */
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# endif
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#endif
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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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int sqlite3VdbeAddOp0(Vdbe*,int);
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int sqlite3VdbeAddOp1(Vdbe*,int,int);
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int sqlite3VdbeAddOp2(Vdbe*,int,int,int);
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int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int);
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int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,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 sqlite3VdbeChangeP3(Vdbe*, int addr, int P3);
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void sqlite3VdbeChangeP5(Vdbe*, u8 P5);
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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 sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
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void sqlite3VdbeUsesBtree(Vdbe*, int);
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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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#ifdef SQLITE_DEBUG
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  void sqlite3VdbeTrace(Vdbe*,FILE*);
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#endif
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void sqlite3VdbeResetStepResult(Vdbe*);
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int sqlite3VdbeReset(Vdbe*);
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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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void sqlite3VdbeSetSql(Vdbe*, const char *z, int n);
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void sqlite3VdbeSwap(Vdbe*,Vdbe*);
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#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
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int sqlite3VdbeReleaseMemory(int);
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#endif
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UnpackedRecord *sqlite3VdbeRecordUnpack(KeyInfo*,int,const void*,void*,int);
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void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord*);
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int sqlite3VdbeRecordCompare(int,const void*,UnpackedRecord*);
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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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  void sqlite3VdbeNoopComment(Vdbe*, const char*, ...);
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# define VdbeNoopComment(X)  sqlite3VdbeNoopComment X
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#else
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# define VdbeComment(X)
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# define VdbeNoopComment(X)
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#endif
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#endif