/* ** 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 /* ** 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 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 */ 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 */ int (*xAdvance)(BtCursor *, int *); } p4; #ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS 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 #ifdef SQLITE_VDBE_COVERAGE int iSrcLine; /* Source-code line that generated this opcode */ #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 */ int nOnce; /* Number of OP_Once instructions */ 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_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 */ #define P4_ADVANCE (-19) /* P4 is a pointer to BtreeNext() or BtreePrev() */ /* Error message codes for OP_Halt */ #define P5_ConstraintNotNull 1 #define P5_ConstraintUnique 2 #define P5_ConstraintCheck 3 #define P5_ConstraintFK 4 /* ** 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(Parse*); 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, int iLineno); void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*); void sqlite3VdbeChangeP1(Vdbe*, u32 addr, int P1); void sqlite3VdbeChangeP2(Vdbe*, u32 addr, int P2); void sqlite3VdbeChangeP3(Vdbe*, u32 addr, int P3); void sqlite3VdbeChangeP5(Vdbe*, u8 P5); void sqlite3VdbeJumpHere(Vdbe*, int addr); void sqlite3VdbeChangeToNoop(Vdbe*, int addr); int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op); void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N); void sqlite3VdbeSetP4KeyInfo(Parse*, Index*); void sqlite3VdbeUsesBtree(Vdbe*, int); VdbeOp *sqlite3VdbeGetOp(Vdbe*, int); int sqlite3VdbeMakeLabel(Vdbe*); void sqlite3VdbeRunOnlyOnce(Vdbe*); void sqlite3VdbeDelete(Vdbe*); void sqlite3VdbeClearObject(sqlite3*,Vdbe*); void sqlite3VdbeMakeReady(Vdbe*,Parse*); int sqlite3VdbeFinalize(Vdbe*); void sqlite3VdbeResolveLabel(Vdbe*, int); int sqlite3VdbeCurrentAddr(Vdbe*); #ifdef SQLITE_DEBUG int sqlite3VdbeAssertMayAbort(Vdbe *, int); #endif void sqlite3VdbeResetStepResult(Vdbe*); void sqlite3VdbeRewind(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 *sqlite3VdbeGetBoundValue(Vdbe*, int, u8); void sqlite3VdbeSetVarmask(Vdbe*, int); #ifndef SQLITE_OMIT_TRACE char *sqlite3VdbeExpandSql(Vdbe*, const char*); #endif void sqlite3VdbeRecordUnpack(KeyInfo*,int,const void*,UnpackedRecord*); int sqlite3VdbeRecordCompare(int,const void*,UnpackedRecord*); UnpackedRecord *sqlite3VdbeAllocUnpackedRecord(KeyInfo *, char *, int, char **); #ifndef SQLITE_OMIT_TRIGGER void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *); #endif /* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on ** each VDBE opcode. ** ** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op ** comments in VDBE programs that show key decision points in the code ** generator. */ #ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS void sqlite3VdbeComment(Vdbe*, const char*, ...); # define VdbeComment(X) sqlite3VdbeComment X void sqlite3VdbeNoopComment(Vdbe*, const char*, ...); # define VdbeNoopComment(X) sqlite3VdbeNoopComment X # ifdef SQLITE_ENABLE_MODULE_COMMENTS # define VdbeModuleComment(X) sqlite3VdbeNoopComment X # else # define VdbeModuleComment(X) # endif #else # define VdbeComment(X) # define VdbeNoopComment(X) # define VdbeModuleComment(X) #endif /* ** The VdbeCoverage macros are used to set a coverage testing point ** for VDBE branch instructions. The coverage testing points are line ** numbers in the sqlite3.c source file. VDBE branch coverage testing ** only works with an amalagmation build. That's ok since a VDBE branch ** coverage build designed for testing the test suite only. No application ** should ever ship with VDBE branch coverage measuring turned on. ** ** VdbeCoverage(v) // Mark the previously coded instruction ** // as a branch ** ** VdbeCoverageIf(v, conditional) // Mark previous if conditional true ** ** VdbeCoverageAlwaysTaken(v) // Previous branch is always taken ** ** VdbeCoverageNeverTaken(v) // Previous branch is never taken ** ** Every VDBE branch operation must be tagged with one of the macros above. ** If not, then when "make test" is run with -DSQLITE_VDBE_COVERAGE and ** -DSQLITE_DEBUG then an ALWAYS() will fail in the vdbeTakeBranch() ** routine in vdbe.c, alerting the developer to the missed tag. */ #ifdef SQLITE_VDBE_COVERAGE void sqlite3VdbeSetLineNumber(Vdbe*,int); # define VdbeCoverage(v) sqlite3VdbeSetLineNumber(v,__LINE__) # define VdbeCoverageIf(v,x) if(x)sqlite3VdbeSetLineNumber(v,__LINE__) # define VdbeCoverageAlwaysTaken(v) sqlite3VdbeSetLineNumber(v,2); # define VdbeCoverageNeverTaken(v) sqlite3VdbeSetLineNumber(v,1); #else # define VdbeCoverage(v) # define VdbeCoverageIf(v,x) # define VdbeCoverageAlwaysTaken(v) # define VdbeCoverageNeverTaken(v) #endif #endif