| /* |
| ** 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. |
| */ |
| #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; |
| |
| /* |
| ** The names of the following types declared in vdbeInt.h are required |
| ** for the VdbeOp definition. |
| */ |
| typedef struct VdbeFunc VdbeFunc; |
| typedef struct Mem Mem; |
| typedef struct SubProgram SubProgram; |
| |
| /* |
| ** 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 */ |
| signed char p4type; /* One of the P4_xxx constants for p4 */ |
| u8 opflags; /* Mask of the OPFLG_* flags in opcodes.h */ |
| u8 p5; /* Fifth parameter is an unsigned character */ |
| int p1; /* First operand */ |
| int p2; /* Second parameter (often the jump destination) */ |
| int p3; /* The third parameter */ |
| union { /* fourth parameter */ |
| int i; /* Integer value if p4type==P4_INT32 */ |
| void *p; /* Generic pointer */ |
| char *z; /* Pointer to data for string (char array) types */ |
| i64 *pI64; /* Used when p4type is P4_INT64 */ |
| double *pReal; /* Used when p4type is P4_REAL */ |
| FuncDef *pFunc; /* Used when p4type is P4_FUNCDEF */ |
| VdbeFunc *pVdbeFunc; /* Used when p4type is P4_VDBEFUNC */ |
| CollSeq *pColl; /* Used when p4type is P4_COLLSEQ */ |
| Mem *pMem; /* Used when p4type is P4_MEM */ |
| VTable *pVtab; /* Used when p4type is P4_VTAB */ |
| KeyInfo *pKeyInfo; /* Used when p4type is P4_KEYINFO */ |
| int *ai; /* Used when p4type is P4_INTARRAY */ |
| SubProgram *pProgram; /* Used when p4type is P4_SUBPROGRAM */ |
| } p4; |
| #ifdef SQLITE_DEBUG |
| char *zComment; /* Comment to improve readability */ |
| #endif |
| #ifdef VDBE_PROFILE |
| int cnt; /* Number of times this instruction was executed */ |
| u64 cycles; /* Total time spent executing this instruction */ |
| #endif |
| }; |
| typedef struct VdbeOp VdbeOp; |
| |
| |
| /* |
| ** A sub-routine used to implement a trigger program. |
| */ |
| struct SubProgram { |
| VdbeOp *aOp; /* Array of opcodes for sub-program */ |
| int nOp; /* Elements in aOp[] */ |
| int nMem; /* Number of memory cells required */ |
| int nCsr; /* Number of cursors required */ |
| void *token; /* id that may be used to recursive triggers */ |
| SubProgram *pNext; /* Next sub-program already visited */ |
| }; |
| |
| /* |
| ** 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 */ |
| signed char p2; /* Second parameter (often the jump destination) */ |
| signed char p3; /* Third parameter */ |
| }; |
| typedef struct VdbeOpList VdbeOpList; |
| |
| /* |
| ** Allowed values of VdbeOp.p4type |
| */ |
| #define P4_NOTUSED 0 /* The P4 parameter is not used */ |
| #define P4_DYNAMIC (-1) /* Pointer to a string obtained from sqliteMalloc() */ |
| #define P4_STATIC (-2) /* Pointer to a static string */ |
| #define P4_COLLSEQ (-4) /* P4 is a pointer to a CollSeq structure */ |
| #define P4_FUNCDEF (-5) /* P4 is a pointer to a FuncDef structure */ |
| #define P4_KEYINFO (-6) /* P4 is a pointer to a KeyInfo structure */ |
| #define P4_VDBEFUNC (-7) /* P4 is a pointer to a VdbeFunc structure */ |
| #define P4_MEM (-8) /* P4 is a pointer to a Mem* structure */ |
| #define P4_TRANSIENT 0 /* P4 is a pointer to a transient string */ |
| #define P4_VTAB (-10) /* P4 is a pointer to an sqlite3_vtab structure */ |
| #define P4_MPRINTF (-11) /* P4 is a string obtained from sqlite3_mprintf() */ |
| #define P4_REAL (-12) /* P4 is a 64-bit floating point value */ |
| #define P4_INT64 (-13) /* P4 is a 64-bit signed integer */ |
| #define P4_INT32 (-14) /* P4 is a 32-bit signed integer */ |
| #define P4_INTARRAY (-15) /* P4 is a vector of 32-bit integers */ |
| #define P4_SUBPROGRAM (-18) /* P4 is a pointer to a SubProgram structure */ |
| |
| /* When adding a P4 argument using P4_KEYINFO, a copy of the KeyInfo structure |
| ** is made. That copy is freed when the Vdbe is finalized. But if the |
| ** argument is P4_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 P4_KEYINFO_HANDOFF (-16) |
| #define P4_KEYINFO_STATIC (-17) |
| |
| /* |
| ** The Vdbe.aColName array contains 5n Mem structures, where n is the |
| ** number of columns of data returned by the statement. |
| */ |
| #define COLNAME_NAME 0 |
| #define COLNAME_DECLTYPE 1 |
| #define COLNAME_DATABASE 2 |
| #define COLNAME_TABLE 3 |
| #define COLNAME_COLUMN 4 |
| #ifdef SQLITE_ENABLE_COLUMN_METADATA |
| # define COLNAME_N 5 /* Number of COLNAME_xxx symbols */ |
| #else |
| # ifdef SQLITE_OMIT_DECLTYPE |
| # define COLNAME_N 1 /* Store only the name */ |
| # else |
| # define COLNAME_N 2 /* Store the name and decltype */ |
| # endif |
| #endif |
| |
| /* |
| ** 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*); |
| int sqlite3VdbeAddOp0(Vdbe*,int); |
| int sqlite3VdbeAddOp1(Vdbe*,int,int); |
| int sqlite3VdbeAddOp2(Vdbe*,int,int,int); |
| int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int); |
| int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int); |
| int sqlite3VdbeAddOp4Int(Vdbe*,int,int,int,int,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, int P3); |
| void sqlite3VdbeChangeP5(Vdbe*, u8 P5); |
| void sqlite3VdbeJumpHere(Vdbe*, int addr); |
| void sqlite3VdbeChangeToNoop(Vdbe*, int addr, int N); |
| void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N); |
| void sqlite3VdbeUsesBtree(Vdbe*, int); |
| VdbeOp *sqlite3VdbeGetOp(Vdbe*, int); |
| int sqlite3VdbeMakeLabel(Vdbe*); |
| void sqlite3VdbeRunOnlyOnce(Vdbe*); |
| void sqlite3VdbeDelete(Vdbe*); |
| void sqlite3VdbeDeleteObject(sqlite3*,Vdbe*); |
| void sqlite3VdbeMakeReady(Vdbe*,int,int,int,int,int,int); |
| int sqlite3VdbeFinalize(Vdbe*); |
| void sqlite3VdbeResolveLabel(Vdbe*, int); |
| int sqlite3VdbeCurrentAddr(Vdbe*); |
| #ifdef SQLITE_DEBUG |
| int sqlite3VdbeAssertMayAbort(Vdbe *, int); |
| void sqlite3VdbeTrace(Vdbe*,FILE*); |
| #endif |
| void sqlite3VdbeResetStepResult(Vdbe*); |
| int sqlite3VdbeReset(Vdbe*); |
| void sqlite3VdbeSetNumCols(Vdbe*,int); |
| int sqlite3VdbeSetColName(Vdbe*, int, int, const char *, void(*)(void*)); |
| void sqlite3VdbeCountChanges(Vdbe*); |
| sqlite3 *sqlite3VdbeDb(Vdbe*); |
| void sqlite3VdbeSetSql(Vdbe*, const char *z, int n, int); |
| void sqlite3VdbeSwap(Vdbe*,Vdbe*); |
| VdbeOp *sqlite3VdbeTakeOpArray(Vdbe*, int*, int*); |
| sqlite3_value *sqlite3VdbeGetValue(Vdbe*, int, u8); |
| void sqlite3VdbeSetVarmask(Vdbe*, int); |
| #ifndef SQLITE_OMIT_TRACE |
| char *sqlite3VdbeExpandSql(Vdbe*, const char*); |
| #endif |
| |
| UnpackedRecord *sqlite3VdbeRecordUnpack(KeyInfo*,int,const void*,char*,int); |
| void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord*); |
| int sqlite3VdbeRecordCompare(int,const void*,UnpackedRecord*); |
| |
| #ifndef SQLITE_OMIT_TRIGGER |
| void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *); |
| #endif |
| |
| |
| #ifndef NDEBUG |
| void sqlite3VdbeComment(Vdbe*, const char*, ...); |
| # define VdbeComment(X) sqlite3VdbeComment X |
| void sqlite3VdbeNoopComment(Vdbe*, const char*, ...); |
| # define VdbeNoopComment(X) sqlite3VdbeNoopComment X |
| #else |
| # define VdbeComment(X) |
| # define VdbeNoopComment(X) |
| #endif |
| |
| #endif |
