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DEFINITIONS
This source file includes following definitions.
- sqliteVdbeCreate
- sqliteVdbeTrace
- sqliteVdbeAddOp
- sqliteVdbeOp3
- sqliteVdbeCode
- sqliteVdbeMakeLabel
- sqliteVdbeResolveLabel
- sqliteVdbeCurrentAddr
- sqliteVdbeAddOpList
- sqliteVdbeChangeP1
- sqliteVdbeChangeP2
- sqliteVdbeChangeP3
- sqliteVdbeDequoteP3
- sqliteVdbeCompressSpace
- sqliteVdbeFindOp
- sqliteVdbeGetOp
- sqlite_set_result_string
- sqlite_set_result_int
- sqlite_set_result_double
- sqlite_set_result_error
- sqlite_user_data
- sqlite_aggregate_context
- sqlite_aggregate_count
- sqliteVdbePrintOp
- sqliteVdbeList
- sqliteVdbeMakeReady
- sqliteVdbeSorterReset
- sqliteVdbeAggReset
- sqliteVdbeKeylistFree
- sqliteVdbeCleanupCursor
- closeAllCursors
- Cleanup
- sqliteVdbeReset
- sqliteVdbeFinalize
- sqlite_bind
- sqliteVdbeDelete
- sqliteVdbeByteSwap
- sqliteVdbeCursorMoveto
/*
** 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;
}