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-/*
-** 2003 September 6
-**
-** 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.
-**
-*************************************************************************
-** This file contains code used for creating, destroying, and populating
-** a VDBE (or an "sqlite_vm" as it is known to the outside world.) Prior
-** to version 2.8.7, all this code was combined into the vdbe.c source file.
-** But that file was getting too big so this subroutines were split out.
-*/
-#include "sqliteInt.h"
-#include "os.h"
-#include <ctype.h>
-#include "vdbeInt.h"
-
-
-/*
-** When debugging the code generator in a symbolic debugger, one can
-** set the sqlite_vdbe_addop_trace to 1 and all opcodes will be printed
-** as they are added to the instruction stream.
-*/
-#ifndef NDEBUG
-int sqlite_vdbe_addop_trace = 0;
-#endif
-
-
-/*
-** Create a new virtual database engine.
-*/
-Vdbe *sqliteVdbeCreate(sqlite *db){
- Vdbe *p;
- p = sqliteMalloc( sizeof(Vdbe) );
- if( p==0 ) return 0;
- p->db = db;
- if( db->pVdbe ){
- db->pVdbe->pPrev = p;
- }
- p->pNext = db->pVdbe;
- p->pPrev = 0;
- db->pVdbe = p;
- p->magic = VDBE_MAGIC_INIT;
- return p;
-}
-
-/*
-** Turn tracing on or off
-*/
-void sqliteVdbeTrace(Vdbe *p, FILE *trace){
- p->trace = trace;
-}
-
-/*
-** Add a new instruction to the list of instructions current in the
-** VDBE. Return the address of the new instruction.
-**
-** Parameters:
-**
-** p Pointer to the VDBE
-**
-** op The opcode for this instruction
-**
-** p1, p2 First two of the three possible operands.
-**
-** Use the sqliteVdbeResolveLabel() function to fix an address and
-** the sqliteVdbeChangeP3() function to change the value of the P3
-** operand.
-*/
-int sqliteVdbeAddOp(Vdbe *p, int op, int p1, int p2){
- int i;
- VdbeOp *pOp;
-
- i = p->nOp;
- p->nOp++;
- assert( p->magic==VDBE_MAGIC_INIT );
- if( i>=p->nOpAlloc ){
- int oldSize = p->nOpAlloc;
- Op *aNew;
- p->nOpAlloc = p->nOpAlloc*2 + 100;
- aNew = sqliteRealloc(p->aOp, p->nOpAlloc*sizeof(Op));
- if( aNew==0 ){
- p->nOpAlloc = oldSize;
- return 0;
- }
- p->aOp = aNew;
- memset(&p->aOp[oldSize], 0, (p->nOpAlloc-oldSize)*sizeof(Op));
- }
- pOp = &p->aOp[i];
- pOp->opcode = op;
- pOp->p1 = p1;
- if( p2<0 && (-1-p2)<p->nLabel && p->aLabel[-1-p2]>=0 ){
- p2 = p->aLabel[-1-p2];
- }
- pOp->p2 = p2;
- pOp->p3 = 0;
- pOp->p3type = P3_NOTUSED;
-#ifndef NDEBUG
- if( sqlite_vdbe_addop_trace ) sqliteVdbePrintOp(0, i, &p->aOp[i]);
-#endif
- return i;
-}
-
-/*
-** Add an opcode that includes the p3 value.
-*/
-int sqliteVdbeOp3(Vdbe *p, int op, int p1, int p2, const char *zP3, int p3type){
- int addr = sqliteVdbeAddOp(p, op, p1, p2);
- sqliteVdbeChangeP3(p, addr, zP3, p3type);
- return addr;
-}
-
-/*
-** Add multiple opcodes. The list is terminated by an opcode of 0.
-*/
-int sqliteVdbeCode(Vdbe *p, ...){
- int addr;
- va_list ap;
- int opcode, p1, p2;
- va_start(ap, p);
- addr = p->nOp;
- while( (opcode = va_arg(ap,int))!=0 ){
- p1 = va_arg(ap,int);
- p2 = va_arg(ap,int);
- sqliteVdbeAddOp(p, opcode, p1, p2);
- }
- va_end(ap);
- return addr;
-}
-
-
-
-/*
-** Create a new symbolic label for an instruction that has yet to be
-** coded. The symbolic label is really just a negative number. The
-** label can be used as the P2 value of an operation. Later, when
-** the label is resolved to a specific address, the VDBE will scan
-** through its operation list and change all values of P2 which match
-** the label into the resolved address.
-**
-** The VDBE knows that a P2 value is a label because labels are
-** always negative and P2 values are suppose to be non-negative.
-** Hence, a negative P2 value is a label that has yet to be resolved.
-*/
-int sqliteVdbeMakeLabel(Vdbe *p){
- int i;
- i = p->nLabel++;
- assert( p->magic==VDBE_MAGIC_INIT );
- if( i>=p->nLabelAlloc ){
- int *aNew;
- p->nLabelAlloc = p->nLabelAlloc*2 + 10;
- aNew = sqliteRealloc( p->aLabel, p->nLabelAlloc*sizeof(p->aLabel[0]));
- if( aNew==0 ){
- sqliteFree(p->aLabel);
- }
- p->aLabel = aNew;
- }
- if( p->aLabel==0 ){
- p->nLabel = 0;
- p->nLabelAlloc = 0;
- return 0;
- }
- p->aLabel[i] = -1;
- return -1-i;
-}
-
-/*
-** Resolve label "x" to be the address of the next instruction to
-** be inserted. The parameter "x" must have been obtained from
-** a prior call to sqliteVdbeMakeLabel().
-*/
-void sqliteVdbeResolveLabel(Vdbe *p, int x){
- int j;
- assert( p->magic==VDBE_MAGIC_INIT );
- if( x<0 && (-x)<=p->nLabel && p->aOp ){
- if( p->aLabel[-1-x]==p->nOp ) return;
- assert( p->aLabel[-1-x]<0 );
- p->aLabel[-1-x] = p->nOp;
- for(j=0; j<p->nOp; j++){
- if( p->aOp[j].p2==x ) p->aOp[j].p2 = p->nOp;
- }
- }
-}
-
-/*
-** Return the address of the next instruction to be inserted.
-*/
-int sqliteVdbeCurrentAddr(Vdbe *p){
- assert( p->magic==VDBE_MAGIC_INIT );
- return p->nOp;
-}
-
-/*
-** Add a whole list of operations to the operation stack. Return the
-** address of the first operation added.
-*/
-int sqliteVdbeAddOpList(Vdbe *p, int nOp, VdbeOpList const *aOp){
- int addr;
- assert( p->magic==VDBE_MAGIC_INIT );
- if( p->nOp + nOp >= p->nOpAlloc ){
- int oldSize = p->nOpAlloc;
- Op *aNew;
- p->nOpAlloc = p->nOpAlloc*2 + nOp + 10;
- aNew = sqliteRealloc(p->aOp, p->nOpAlloc*sizeof(Op));
- if( aNew==0 ){
- p->nOpAlloc = oldSize;
- return 0;
- }
- p->aOp = aNew;
- memset(&p->aOp[oldSize], 0, (p->nOpAlloc-oldSize)*sizeof(Op));
- }
- addr = p->nOp;
- if( nOp>0 ){
- int i;
- VdbeOpList const *pIn = aOp;
- for(i=0; i<nOp; i++, pIn++){
- int p2 = pIn->p2;
- VdbeOp *pOut = &p->aOp[i+addr];
- pOut->opcode = pIn->opcode;
- pOut->p1 = pIn->p1;
- pOut->p2 = p2<0 ? addr + ADDR(p2) : p2;
- pOut->p3 = pIn->p3;
- pOut->p3type = pIn->p3 ? P3_STATIC : P3_NOTUSED;
-#ifndef NDEBUG
- if( sqlite_vdbe_addop_trace ){
- sqliteVdbePrintOp(0, i+addr, &p->aOp[i+addr]);
- }
-#endif
- }
- p->nOp += nOp;
- }
- return addr;
-}
-
-/*
-** Change the value of the P1 operand for a specific instruction.
-** This routine is useful when a large program is loaded from a
-** static array using sqliteVdbeAddOpList but we want to make a
-** few minor changes to the program.
-*/
-void sqliteVdbeChangeP1(Vdbe *p, int addr, int val){
- assert( p->magic==VDBE_MAGIC_INIT );
- if( p && addr>=0 && p->nOp>addr && p->aOp ){
- p->aOp[addr].p1 = val;
- }
-}
-
-/*
-** Change the value of the P2 operand for a specific instruction.
-** This routine is useful for setting a jump destination.
-*/
-void sqliteVdbeChangeP2(Vdbe *p, int addr, int val){
- assert( val>=0 );
- assert( p->magic==VDBE_MAGIC_INIT );
- if( p && addr>=0 && p->nOp>addr && p->aOp ){
- p->aOp[addr].p2 = val;
- }
-}
-
-/*
-** Change the value of the P3 operand for a specific instruction.
-** This routine is useful when a large program is loaded from a
-** static array using sqliteVdbeAddOpList but we want to make a
-** few minor changes to the program.
-**
-** If n>=0 then the P3 operand is dynamic, meaning that a copy of
-** the string is made into memory obtained from sqliteMalloc().
-** A value of n==0 means copy bytes of zP3 up to and including the
-** first null byte. If n>0 then copy n+1 bytes of zP3.
-**
-** If n==P3_STATIC it means that zP3 is a pointer to a constant static
-** string and we can just copy the pointer. n==P3_POINTER means zP3 is
-** a pointer to some object other than a string.
-**
-** If addr<0 then change P3 on the most recently inserted instruction.
-*/
-void sqliteVdbeChangeP3(Vdbe *p, int addr, const char *zP3, int n){
- Op *pOp;
- assert( p->magic==VDBE_MAGIC_INIT );
- if( p==0 || p->aOp==0 ) return;
- if( addr<0 || addr>=p->nOp ){
- addr = p->nOp - 1;
- if( addr<0 ) return;
- }
- pOp = &p->aOp[addr];
- if( pOp->p3 && pOp->p3type==P3_DYNAMIC ){
- sqliteFree(pOp->p3);
- pOp->p3 = 0;
- }
- if( zP3==0 ){
- pOp->p3 = 0;
- pOp->p3type = P3_NOTUSED;
- }else if( n<0 ){
- pOp->p3 = (char*)zP3;
- pOp->p3type = n;
- }else{
- sqliteSetNString(&pOp->p3, zP3, n, 0);
- pOp->p3type = P3_DYNAMIC;
- }
-}
-
-/*
-** If the P3 operand to the specified instruction appears
-** to be a quoted string token, then this procedure removes
-** the quotes.
-**
-** The quoting operator can be either a grave ascent (ASCII 0x27)
-** or a double quote character (ASCII 0x22). Two quotes in a row
-** resolve to be a single actual quote character within the string.
-*/
-void sqliteVdbeDequoteP3(Vdbe *p, int addr){
- Op *pOp;
- assert( p->magic==VDBE_MAGIC_INIT );
- if( p->aOp==0 ) return;
- if( addr<0 || addr>=p->nOp ){
- addr = p->nOp - 1;
- if( addr<0 ) return;
- }
- pOp = &p->aOp[addr];
- if( pOp->p3==0 || pOp->p3[0]==0 ) return;
- if( pOp->p3type==P3_POINTER ) return;
- if( pOp->p3type!=P3_DYNAMIC ){
- pOp->p3 = sqliteStrDup(pOp->p3);
- pOp->p3type = P3_DYNAMIC;
- }
- sqliteDequote(pOp->p3);
-}
-
-/*
-** On the P3 argument of the given instruction, change all
-** strings of whitespace characters into a single space and
-** delete leading and trailing whitespace.
-*/
-void sqliteVdbeCompressSpace(Vdbe *p, int addr){
- unsigned char *z;
- int i, j;
- Op *pOp;
- assert( p->magic==VDBE_MAGIC_INIT );
- if( p->aOp==0 || addr<0 || addr>=p->nOp ) return;
- pOp = &p->aOp[addr];
- if( pOp->p3type==P3_POINTER ){
- return;
- }
- if( pOp->p3type!=P3_DYNAMIC ){
- pOp->p3 = sqliteStrDup(pOp->p3);
- pOp->p3type = P3_DYNAMIC;
- }
- z = (unsigned char*)pOp->p3;
- if( z==0 ) return;
- i = j = 0;
- while( isspace(z[i]) ){ i++; }
- while( z[i] ){
- if( isspace(z[i]) ){
- z[j++] = ' ';
- while( isspace(z[++i]) ){}
- }else{
- z[j++] = z[i++];
- }
- }
- while( j>0 && isspace(z[j-1]) ){ j--; }
- z[j] = 0;
-}
-
-/*
-** Search for the current program for the given opcode and P2
-** value. Return the address plus 1 if found and 0 if not found.
-*/
-int sqliteVdbeFindOp(Vdbe *p, int op, int p2){
- int i;
- assert( p->magic==VDBE_MAGIC_INIT );
- for(i=0; i<p->nOp; i++){
- if( p->aOp[i].opcode==op && p->aOp[i].p2==p2 ) return i+1;
- }
- return 0;
-}
-
-/*
-** Return the opcode for a given address.
-*/
-VdbeOp *sqliteVdbeGetOp(Vdbe *p, int addr){
- assert( p->magic==VDBE_MAGIC_INIT );
- assert( addr>=0 && addr<p->nOp );
- return &p->aOp[addr];
-}
-
-/*
-** The following group or routines are employed by installable functions
-** to return their results.
-**
-** The sqlite_set_result_string() routine can be used to return a string
-** value or to return a NULL. To return a NULL, pass in NULL for zResult.
-** A copy is made of the string before this routine returns so it is safe
-** to pass in an ephemeral string.
-**
-** sqlite_set_result_error() works like sqlite_set_result_string() except
-** that it signals a fatal error. The string argument, if any, is the
-** error message. If the argument is NULL a generic substitute error message
-** is used.
-**
-** The sqlite_set_result_int() and sqlite_set_result_double() set the return
-** value of the user function to an integer or a double.
-**
-** These routines are defined here in vdbe.c because they depend on knowing
-** the internals of the sqlite_func structure which is only defined in
-** this source file.
-*/
-char *sqlite_set_result_string(sqlite_func *p, const char *zResult, int n){
- assert( !p->isStep );
- if( p->s.flags & MEM_Dyn ){
- sqliteFree(p->s.z);
- }
- if( zResult==0 ){
- p->s.flags = MEM_Null;
- n = 0;
- p->s.z = 0;
- p->s.n = 0;
- }else{
- if( n<0 ) n = strlen(zResult);
- if( n<NBFS-1 ){
- memcpy(p->s.zShort, zResult, n);
- p->s.zShort[n] = 0;
- p->s.flags = MEM_Str | MEM_Short;
- p->s.z = p->s.zShort;
- }else{
- p->s.z = sqliteMallocRaw( n+1 );
- if( p->s.z ){
- memcpy(p->s.z, zResult, n);
- p->s.z[n] = 0;
- }
- p->s.flags = MEM_Str | MEM_Dyn;
- }
- p->s.n = n+1;
- }
- return p->s.z;
-}
-void sqlite_set_result_int(sqlite_func *p, int iResult){
- assert( !p->isStep );
- if( p->s.flags & MEM_Dyn ){
- sqliteFree(p->s.z);
- }
- p->s.i = iResult;
- p->s.flags = MEM_Int;
-}
-void sqlite_set_result_double(sqlite_func *p, double rResult){
- assert( !p->isStep );
- if( p->s.flags & MEM_Dyn ){
- sqliteFree(p->s.z);
- }
- p->s.r = rResult;
- p->s.flags = MEM_Real;
-}
-void sqlite_set_result_error(sqlite_func *p, const char *zMsg, int n){
- assert( !p->isStep );
- sqlite_set_result_string(p, zMsg, n);
- p->isError = 1;
-}
-
-/*
-** Extract the user data from a sqlite_func structure and return a
-** pointer to it.
-*/
-void *sqlite_user_data(sqlite_func *p){
- assert( p && p->pFunc );
- return p->pFunc->pUserData;
-}
-
-/*
-** Allocate or return the aggregate context for a user function. A new
-** context is allocated on the first call. Subsequent calls return the
-** same context that was returned on prior calls.
-**
-** This routine is defined here in vdbe.c because it depends on knowing
-** the internals of the sqlite_func structure which is only defined in
-** this source file.
-*/
-void *sqlite_aggregate_context(sqlite_func *p, int nByte){
- assert( p && p->pFunc && p->pFunc->xStep );
- if( p->pAgg==0 ){
- if( nByte<=NBFS ){
- p->pAgg = (void*)p->s.z;
- memset(p->pAgg, 0, nByte);
- }else{
- p->pAgg = sqliteMalloc( nByte );
- }
- }
- return p->pAgg;
-}
-
-/*
-** Return the number of times the Step function of a aggregate has been
-** called.
-**
-** This routine is defined here in vdbe.c because it depends on knowing
-** the internals of the sqlite_func structure which is only defined in
-** this source file.
-*/
-int sqlite_aggregate_count(sqlite_func *p){
- assert( p && p->pFunc && p->pFunc->xStep );
- return p->cnt;
-}
-
-#if !defined(NDEBUG) || defined(VDBE_PROFILE)
-/*
-** Print a single opcode. This routine is used for debugging only.
-*/
-void sqliteVdbePrintOp(FILE *pOut, int pc, Op *pOp){
- char *zP3;
- char zPtr[40];
- if( pOp->p3type==P3_POINTER ){
- sprintf(zPtr, "ptr(%#lx)", (long)pOp->p3);
- zP3 = zPtr;
- }else{
- zP3 = pOp->p3;
- }
- if( pOut==0 ) pOut = stdout;
- fprintf(pOut,"%4d %-12s %4d %4d %s\n",
- pc, sqliteOpcodeNames[pOp->opcode], pOp->p1, pOp->p2, zP3 ? zP3 : "");
- fflush(pOut);
-}
-#endif
-
-/*
-** Give a listing of the program in the virtual machine.
-**
-** The interface is the same as sqliteVdbeExec(). But instead of
-** running the code, it invokes the callback once for each instruction.
-** This feature is used to implement "EXPLAIN".
-*/
-int sqliteVdbeList(
- Vdbe *p /* The VDBE */
-){
- sqlite *db = p->db;
- int i;
- int rc = SQLITE_OK;
- static char *azColumnNames[] = {
- "addr", "opcode", "p1", "p2", "p3",
- "int", "text", "int", "int", "text",
- 0
- };
-
- assert( p->popStack==0 );
- assert( p->explain );
- p->azColName = azColumnNames;
- p->azResColumn = p->zArgv;
- for(i=0; i<5; i++) p->zArgv[i] = p->aStack[i].zShort;
- i = p->pc;
- if( i>=p->nOp ){
- p->rc = SQLITE_OK;
- rc = SQLITE_DONE;
- }else if( db->flags & SQLITE_Interrupt ){
- db->flags &= ~SQLITE_Interrupt;
- if( db->magic!=SQLITE_MAGIC_BUSY ){
- p->rc = SQLITE_MISUSE;
- }else{
- p->rc = SQLITE_INTERRUPT;
- }
- rc = SQLITE_ERROR;
- sqliteSetString(&p->zErrMsg, sqlite_error_string(p->rc), (char*)0);
- }else{
- sprintf(p->zArgv[0],"%d",i);
- sprintf(p->zArgv[2],"%d", p->aOp[i].p1);
- sprintf(p->zArgv[3],"%d", p->aOp[i].p2);
- if( p->aOp[i].p3type==P3_POINTER ){
- sprintf(p->aStack[4].zShort, "ptr(%#lx)", (long)p->aOp[i].p3);
- p->zArgv[4] = p->aStack[4].zShort;
- }else{
- p->zArgv[4] = p->aOp[i].p3;
- }
- p->zArgv[1] = sqliteOpcodeNames[p->aOp[i].opcode];
- p->pc = i+1;
- p->azResColumn = p->zArgv;
- p->nResColumn = 5;
- p->rc = SQLITE_OK;
- rc = SQLITE_ROW;
- }
- return rc;
-}
-
-/*
-** Prepare a virtual machine for execution. This involves things such
-** as allocating stack space and initializing the program counter.
-** After the VDBE has be prepped, it can be executed by one or more
-** calls to sqliteVdbeExec().
-*/
-void sqliteVdbeMakeReady(
- Vdbe *p, /* The VDBE */
- int nVar, /* Number of '?' see in the SQL statement */
- int isExplain /* True if the EXPLAIN keywords is present */
-){
- int n;
-
- assert( p!=0 );
- assert( p->magic==VDBE_MAGIC_INIT );
-
- /* Add a HALT instruction to the very end of the program.
- */
- if( p->nOp==0 || (p->aOp && p->aOp[p->nOp-1].opcode!=OP_Halt) ){
- sqliteVdbeAddOp(p, OP_Halt, 0, 0);
- }
-
- /* No instruction ever pushes more than a single element onto the
- ** stack. And the stack never grows on successive executions of the
- ** same loop. So the total number of instructions is an upper bound
- ** on the maximum stack depth required.
- **
- ** Allocation all the stack space we will ever need.
- */
- if( p->aStack==0 ){
- p->nVar = nVar;
- assert( nVar>=0 );
- n = isExplain ? 10 : p->nOp;
- p->aStack = sqliteMalloc(
- n*(sizeof(p->aStack[0]) + 2*sizeof(char*)) /* aStack and zArgv */
- + p->nVar*(sizeof(char*)+sizeof(int)+1) /* azVar, anVar, abVar */
- );
- p->zArgv = (char**)&p->aStack[n];
- p->azColName = (char**)&p->zArgv[n];
- p->azVar = (char**)&p->azColName[n];
- p->anVar = (int*)&p->azVar[p->nVar];
- p->abVar = (u8*)&p->anVar[p->nVar];
- }
-
- sqliteHashInit(&p->agg.hash, SQLITE_HASH_BINARY, 0);
- p->agg.pSearch = 0;
-#ifdef MEMORY_DEBUG
- if( sqliteOsFileExists("vdbe_trace") ){
- p->trace = stdout;
- }
-#endif
- p->pTos = &p->aStack[-1];
- p->pc = 0;
- p->rc = SQLITE_OK;
- p->uniqueCnt = 0;
- p->returnDepth = 0;
- p->errorAction = OE_Abort;
- p->undoTransOnError = 0;
- p->popStack = 0;
- p->explain |= isExplain;
- p->magic = VDBE_MAGIC_RUN;
-#ifdef VDBE_PROFILE
- {
- int i;
- for(i=0; i<p->nOp; i++){
- p->aOp[i].cnt = 0;
- p->aOp[i].cycles = 0;
- }
- }
-#endif
-}
-
-
-/*
-** Remove any elements that remain on the sorter for the VDBE given.
-*/
-void sqliteVdbeSorterReset(Vdbe *p){
- while( p->pSort ){
- Sorter *pSorter = p->pSort;
- p->pSort = pSorter->pNext;
- sqliteFree(pSorter->zKey);
- sqliteFree(pSorter->pData);
- sqliteFree(pSorter);
- }
-}
-
-/*
-** Reset an Agg structure. Delete all its contents.
-**
-** For installable aggregate functions, if the step function has been
-** called, make sure the finalizer function has also been called. The
-** finalizer might need to free memory that was allocated as part of its
-** private context. If the finalizer has not been called yet, call it
-** now.
-*/
-void sqliteVdbeAggReset(Agg *pAgg){
- int i;
- HashElem *p;
- for(p = sqliteHashFirst(&pAgg->hash); p; p = sqliteHashNext(p)){
- AggElem *pElem = sqliteHashData(p);
- assert( pAgg->apFunc!=0 );
- for(i=0; i<pAgg->nMem; i++){
- Mem *pMem = &pElem->aMem[i];
- if( pAgg->apFunc[i] && (pMem->flags & MEM_AggCtx)!=0 ){
- sqlite_func ctx;
- ctx.pFunc = pAgg->apFunc[i];
- ctx.s.flags = MEM_Null;
- ctx.pAgg = pMem->z;
- ctx.cnt = pMem->i;
- ctx.isStep = 0;
- ctx.isError = 0;
- (*pAgg->apFunc[i]->xFinalize)(&ctx);
- if( pMem->z!=0 && pMem->z!=pMem->zShort ){
- sqliteFree(pMem->z);
- }
- if( ctx.s.flags & MEM_Dyn ){
- sqliteFree(ctx.s.z);
- }
- }else if( pMem->flags & MEM_Dyn ){
- sqliteFree(pMem->z);
- }
- }
- sqliteFree(pElem);
- }
- sqliteHashClear(&pAgg->hash);
- sqliteFree(pAgg->apFunc);
- pAgg->apFunc = 0;
- pAgg->pCurrent = 0;
- pAgg->pSearch = 0;
- pAgg->nMem = 0;
-}
-
-/*
-** Delete a keylist
-*/
-void sqliteVdbeKeylistFree(Keylist *p){
- while( p ){
- Keylist *pNext = p->pNext;
- sqliteFree(p);
- p = pNext;
- }
-}
-
-/*
-** Close a cursor and release all the resources that cursor happens
-** to hold.
-*/
-void sqliteVdbeCleanupCursor(Cursor *pCx){
- if( pCx->pCursor ){
- sqliteBtreeCloseCursor(pCx->pCursor);
- }
- if( pCx->pBt ){
- sqliteBtreeClose(pCx->pBt);
- }
- sqliteFree(pCx->pData);
- memset(pCx, 0, sizeof(Cursor));
-}
-
-/*
-** Close all cursors
-*/
-static void closeAllCursors(Vdbe *p){
- int i;
- for(i=0; i<p->nCursor; i++){
- sqliteVdbeCleanupCursor(&p->aCsr[i]);
- }
- sqliteFree(p->aCsr);
- p->aCsr = 0;
- p->nCursor = 0;
-}
-
-/*
-** Clean up the VM after execution.
-**
-** This routine will automatically close any cursors, lists, and/or
-** sorters that were left open. It also deletes the values of
-** variables in the azVariable[] array.
-*/
-static void Cleanup(Vdbe *p){
- int i;
- if( p->aStack ){
- Mem *pTos = p->pTos;
- while( pTos>=p->aStack ){
- if( pTos->flags & MEM_Dyn ){
- sqliteFree(pTos->z);
- }
- pTos--;
- }
- p->pTos = pTos;
- }
- closeAllCursors(p);
- if( p->aMem ){
- for(i=0; i<p->nMem; i++){
- if( p->aMem[i].flags & MEM_Dyn ){
- sqliteFree(p->aMem[i].z);
- }
- }
- }
- sqliteFree(p->aMem);
- p->aMem = 0;
- p->nMem = 0;
- if( p->pList ){
- sqliteVdbeKeylistFree(p->pList);
- p->pList = 0;
- }
- sqliteVdbeSorterReset(p);
- if( p->pFile ){
- if( p->pFile!=stdin ) fclose(p->pFile);
- p->pFile = 0;
- }
- if( p->azField ){
- sqliteFree(p->azField);
- p->azField = 0;
- }
- p->nField = 0;
- if( p->zLine ){
- sqliteFree(p->zLine);
- p->zLine = 0;
- }
- p->nLineAlloc = 0;
- sqliteVdbeAggReset(&p->agg);
- if( p->aSet ){
- for(i=0; i<p->nSet; i++){
- sqliteHashClear(&p->aSet[i].hash);
- }
- }
- sqliteFree(p->aSet);
- p->aSet = 0;
- p->nSet = 0;
- if( p->keylistStack ){
- int ii;
- for(ii = 0; ii < p->keylistStackDepth; ii++){
- sqliteVdbeKeylistFree(p->keylistStack[ii]);
- }
- sqliteFree(p->keylistStack);
- p->keylistStackDepth = 0;
- p->keylistStack = 0;
- }
- sqliteFree(p->contextStack);
- p->contextStack = 0;
- sqliteFree(p->zErrMsg);
- p->zErrMsg = 0;
-}
-
-/*
-** Clean up a VDBE after execution but do not delete the VDBE just yet.
-** Write any error messages into *pzErrMsg. Return the result code.
-**
-** After this routine is run, the VDBE should be ready to be executed
-** again.
-*/
-int sqliteVdbeReset(Vdbe *p, char **pzErrMsg){
- sqlite *db = p->db;
- int i;
-
- if( p->magic!=VDBE_MAGIC_RUN && p->magic!=VDBE_MAGIC_HALT ){
- sqliteSetString(pzErrMsg, sqlite_error_string(SQLITE_MISUSE), (char*)0);
- return SQLITE_MISUSE;
- }
- if( p->zErrMsg ){
- if( pzErrMsg && *pzErrMsg==0 ){
- *pzErrMsg = p->zErrMsg;
- }else{
- sqliteFree(p->zErrMsg);
- }
- p->zErrMsg = 0;
- }else if( p->rc ){
- sqliteSetString(pzErrMsg, sqlite_error_string(p->rc), (char*)0);
- }
- Cleanup(p);
- if( p->rc!=SQLITE_OK ){
- switch( p->errorAction ){
- case OE_Abort: {
- if( !p->undoTransOnError ){
- for(i=0; i<db->nDb; i++){
- if( db->aDb[i].pBt ){
- sqliteBtreeRollbackCkpt(db->aDb[i].pBt);
- }
- }
- break;
- }
- /* Fall through to ROLLBACK */
- }
- case OE_Rollback: {
- sqliteRollbackAll(db);
- db->flags &= ~SQLITE_InTrans;
- db->onError = OE_Default;
- break;
- }
- default: {
- if( p->undoTransOnError ){
- sqliteRollbackAll(db);
- db->flags &= ~SQLITE_InTrans;
- db->onError = OE_Default;
- }
- break;
- }
- }
- sqliteRollbackInternalChanges(db);
- }
- for(i=0; i<db->nDb; i++){
- if( db->aDb[i].pBt && db->aDb[i].inTrans==2 ){
- sqliteBtreeCommitCkpt(db->aDb[i].pBt);
- db->aDb[i].inTrans = 1;
- }
- }
- assert( p->pTos<&p->aStack[p->pc] || sqlite_malloc_failed==1 );
-#ifdef VDBE_PROFILE
- {
- FILE *out = fopen("vdbe_profile.out", "a");
- if( out ){
- int i;
- fprintf(out, "---- ");
- for(i=0; i<p->nOp; i++){
- fprintf(out, "%02x", p->aOp[i].opcode);
- }
- fprintf(out, "\n");
- for(i=0; i<p->nOp; i++){
- fprintf(out, "%6d %10lld %8lld ",
- p->aOp[i].cnt,
- p->aOp[i].cycles,
- p->aOp[i].cnt>0 ? p->aOp[i].cycles/p->aOp[i].cnt : 0
- );
- sqliteVdbePrintOp(out, i, &p->aOp[i]);
- }
- fclose(out);
- }
- }
-#endif
- p->magic = VDBE_MAGIC_INIT;
- return p->rc;
-}
-
-/*
-** Clean up and delete a VDBE after execution. Return an integer which is
-** the result code. Write any error message text into *pzErrMsg.
-*/
-int sqliteVdbeFinalize(Vdbe *p, char **pzErrMsg){
- int rc;
- sqlite *db;
-
- if( p->magic!=VDBE_MAGIC_RUN && p->magic!=VDBE_MAGIC_HALT ){
- sqliteSetString(pzErrMsg, sqlite_error_string(SQLITE_MISUSE), (char*)0);
- return SQLITE_MISUSE;
- }
- db = p->db;
- rc = sqliteVdbeReset(p, pzErrMsg);
- sqliteVdbeDelete(p);
- if( db->want_to_close && db->pVdbe==0 ){
- sqlite_close(db);
- }
- if( rc==SQLITE_SCHEMA ){
- sqliteResetInternalSchema(db, 0);
- }
- return rc;
-}
-
-/*
-** Set the values of all variables. Variable $1 in the original SQL will
-** be the string azValue[0]. $2 will have the value azValue[1]. And
-** so forth. If a value is out of range (for example $3 when nValue==2)
-** then its value will be NULL.
-**
-** This routine overrides any prior call.
-*/
-int sqlite_bind(sqlite_vm *pVm, int i, const char *zVal, int len, int copy){
- Vdbe *p = (Vdbe*)pVm;
- if( p->magic!=VDBE_MAGIC_RUN || p->pc!=0 ){
- return SQLITE_MISUSE;
- }
- if( i<1 || i>p->nVar ){
- return SQLITE_RANGE;
- }
- i--;
- if( p->abVar[i] ){
- sqliteFree(p->azVar[i]);
- }
- if( zVal==0 ){
- copy = 0;
- len = 0;
- }
- if( len<0 ){
- len = strlen(zVal)+1;
- }
- if( copy ){
- p->azVar[i] = sqliteMalloc( len );
- if( p->azVar[i] ) memcpy(p->azVar[i], zVal, len);
- }else{
- p->azVar[i] = (char*)zVal;
- }
- p->abVar[i] = copy;
- p->anVar[i] = len;
- return SQLITE_OK;
-}
-
-
-/*
-** Delete an entire VDBE.
-*/
-void sqliteVdbeDelete(Vdbe *p){
- int i;
- if( p==0 ) return;
- Cleanup(p);
- if( p->pPrev ){
- p->pPrev->pNext = p->pNext;
- }else{
- assert( p->db->pVdbe==p );
- p->db->pVdbe = p->pNext;
- }
- if( p->pNext ){
- p->pNext->pPrev = p->pPrev;
- }
- p->pPrev = p->pNext = 0;
- if( p->nOpAlloc==0 ){
- p->aOp = 0;
- p->nOp = 0;
- }
- for(i=0; i<p->nOp; i++){
- if( p->aOp[i].p3type==P3_DYNAMIC ){
- sqliteFree(p->aOp[i].p3);
- }
- }
- for(i=0; i<p->nVar; i++){
- if( p->abVar[i] ) sqliteFree(p->azVar[i]);
- }
- sqliteFree(p->aOp);
- sqliteFree(p->aLabel);
- sqliteFree(p->aStack);
- p->magic = VDBE_MAGIC_DEAD;
- sqliteFree(p);
-}
-
-/*
-** Convert an integer in between the native integer format and
-** the bigEndian format used as the record number for tables.
-**
-** The bigEndian format (most significant byte first) is used for
-** record numbers so that records will sort into the correct order
-** even though memcmp() is used to compare the keys. On machines
-** whose native integer format is little endian (ex: i486) the
-** order of bytes is reversed. On native big-endian machines
-** (ex: Alpha, Sparc, Motorola) the byte order is the same.
-**
-** This function is its own inverse. In other words
-**
-** X == byteSwap(byteSwap(X))
-*/
-int sqliteVdbeByteSwap(int x){
- union {
- char zBuf[sizeof(int)];
- int i;
- } ux;
- ux.zBuf[3] = x&0xff;
- ux.zBuf[2] = (x>>8)&0xff;
- ux.zBuf[1] = (x>>16)&0xff;
- ux.zBuf[0] = (x>>24)&0xff;
- return ux.i;
-}
-
-/*
-** If a MoveTo operation is pending on the given cursor, then do that
-** MoveTo now. Return an error code. If no MoveTo is pending, this
-** routine does nothing and returns SQLITE_OK.
-*/
-int sqliteVdbeCursorMoveto(Cursor *p){
- if( p->deferredMoveto ){
- int res;
- extern int sqlite_search_count;
- sqliteBtreeMoveto(p->pCursor, (char*)&p->movetoTarget, sizeof(int), &res);
- p->lastRecno = keyToInt(p->movetoTarget);
- p->recnoIsValid = res==0;
- if( res<0 ){
- sqliteBtreeNext(p->pCursor, &res);
- }
- sqlite_search_count++;
- p->deferredMoveto = 0;
- }
- return SQLITE_OK;
-}
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