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DBD-SQLite-SQLcipher/vdbeaux.c

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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 "sqlite3_stmt" 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.
**
** $Id: vdbeaux.c,v 1.430 2009/01/07 08:12:16 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include "vdbeInt.h"
/*
** When debugging the code generator in a symbolic debugger, one can
** set the sqlite3VdbeAddopTrace to 1 and all opcodes will be printed
** as they are added to the instruction stream.
*/
#ifdef SQLITE_DEBUG
int sqlite3VdbeAddopTrace = 0;
#endif
/*
** Create a new virtual database engine.
*/
Vdbe *sqlite3VdbeCreate(sqlite3 *db){
Vdbe *p;
p = sqlite3DbMallocZero(db, 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;
}
/*
** Remember the SQL string for a prepared statement.
*/
void sqlite3VdbeSetSql(Vdbe *p, const char *z, int n){
if( p==0 ) return;
assert( p->zSql==0 );
p->zSql = sqlite3DbStrNDup(p->db, z, n);
}
/*
** Return the SQL associated with a prepared statement
*/
const char *sqlite3_sql(sqlite3_stmt *pStmt){
return ((Vdbe *)pStmt)->zSql;
}
/*
** Swap all content between two VDBE structures.
*/
void sqlite3VdbeSwap(Vdbe *pA, Vdbe *pB){
Vdbe tmp, *pTmp;
char *zTmp;
int nTmp;
tmp = *pA;
*pA = *pB;
*pB = tmp;
pTmp = pA->pNext;
pA->pNext = pB->pNext;
pB->pNext = pTmp;
pTmp = pA->pPrev;
pA->pPrev = pB->pPrev;
pB->pPrev = pTmp;
zTmp = pA->zSql;
pA->zSql = pB->zSql;
pB->zSql = zTmp;
nTmp = pA->nSql;
pA->nSql = pB->nSql;
pB->nSql = nTmp;
}
#ifdef SQLITE_DEBUG
/*
** Turn tracing on or off
*/
void sqlite3VdbeTrace(Vdbe *p, FILE *trace){
p->trace = trace;
}
#endif
/*
** Resize the Vdbe.aOp array so that it is at least one op larger than
** it was.
**
** If an out-of-memory error occurs while resizing the array, return
** SQLITE_NOMEM. In this case Vdbe.aOp and Vdbe.nOpAlloc remain
** unchanged (this is so that any opcodes already allocated can be
** correctly deallocated along with the rest of the Vdbe).
*/
static int growOpArray(Vdbe *p){
VdbeOp *pNew;
int nNew = (p->nOpAlloc ? p->nOpAlloc*2 : (int)(1024/sizeof(Op)));
pNew = sqlite3DbRealloc(p->db, p->aOp, nNew*sizeof(Op));
if( pNew ){
p->nOpAlloc = nNew;
p->aOp = pNew;
}
return (pNew ? SQLITE_OK : SQLITE_NOMEM);
}
/*
** 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, p3 Operands
**
** Use the sqlite3VdbeResolveLabel() function to fix an address and
** the sqlite3VdbeChangeP4() function to change the value of the P4
** operand.
*/
int sqlite3VdbeAddOp3(Vdbe *p, int op, int p1, int p2, int p3){
int i;
VdbeOp *pOp;
i = p->nOp;
assert( p->magic==VDBE_MAGIC_INIT );
assert( op>0 && op<0xff );
if( p->nOpAlloc<=i ){
if( growOpArray(p) ){
return 0;
}
}
p->nOp++;
pOp = &p->aOp[i];
pOp->opcode = (u8)op;
pOp->p5 = 0;
pOp->p1 = p1;
pOp->p2 = p2;
pOp->p3 = p3;
pOp->p4.p = 0;
pOp->p4type = P4_NOTUSED;
p->expired = 0;
#ifdef SQLITE_DEBUG
pOp->zComment = 0;
if( sqlite3VdbeAddopTrace ) sqlite3VdbePrintOp(0, i, &p->aOp[i]);
#endif
#ifdef VDBE_PROFILE
pOp->cycles = 0;
pOp->cnt = 0;
#endif
return i;
}
int sqlite3VdbeAddOp0(Vdbe *p, int op){
return sqlite3VdbeAddOp3(p, op, 0, 0, 0);
}
int sqlite3VdbeAddOp1(Vdbe *p, int op, int p1){
return sqlite3VdbeAddOp3(p, op, p1, 0, 0);
}
int sqlite3VdbeAddOp2(Vdbe *p, int op, int p1, int p2){
return sqlite3VdbeAddOp3(p, op, p1, p2, 0);
}
/*
** Add an opcode that includes the p4 value as a pointer.
*/
int sqlite3VdbeAddOp4(
Vdbe *p, /* Add the opcode to this VM */
int op, /* The new opcode */
int p1, /* The P1 operand */
int p2, /* The P2 operand */
int p3, /* The P3 operand */
const char *zP4, /* The P4 operand */
int p4type /* P4 operand type */
){
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, zP4, p4type);
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.
**
** Zero is returned if a malloc() fails.
*/
int sqlite3VdbeMakeLabel(Vdbe *p){
int i;
i = p->nLabel++;
assert( p->magic==VDBE_MAGIC_INIT );
if( i>=p->nLabelAlloc ){
int n = p->nLabelAlloc*2 + 5;
p->aLabel = sqlite3DbReallocOrFree(p->db, p->aLabel,
n*sizeof(p->aLabel[0]));
p->nLabelAlloc = sqlite3DbMallocSize(p->db, p->aLabel)/sizeof(p->aLabel[0]);
}
if( p->aLabel ){
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 sqlite3VdbeMakeLabel().
*/
void sqlite3VdbeResolveLabel(Vdbe *p, int x){
int j = -1-x;
assert( p->magic==VDBE_MAGIC_INIT );
assert( j>=0 && j<p->nLabel );
if( p->aLabel ){
p->aLabel[j] = p->nOp;
}
}
/*
** Loop through the program looking for P2 values that are negative
** on jump instructions. Each such value is a label. Resolve the
** label by setting the P2 value to its correct non-zero value.
**
** This routine is called once after all opcodes have been inserted.
**
** Variable *pMaxFuncArgs is set to the maximum value of any P2 argument
** to an OP_Function, OP_AggStep or OP_VFilter opcode. This is used by
** sqlite3VdbeMakeReady() to size the Vdbe.apArg[] array.
**
** This routine also does the following optimization: It scans for
** instructions that might cause a statement rollback. Such instructions
** are:
**
** * OP_Halt with P1=SQLITE_CONSTRAINT and P2=OE_Abort.
** * OP_Destroy
** * OP_VUpdate
** * OP_VRename
**
** If no such instruction is found, then every Statement instruction
** is changed to a Noop. In this way, we avoid creating the statement
** journal file unnecessarily.
*/
static void resolveP2Values(Vdbe *p, int *pMaxFuncArgs){
int i;
int nMaxArgs = 0;
Op *pOp;
int *aLabel = p->aLabel;
int doesStatementRollback = 0;
int hasStatementBegin = 0;
p->readOnly = 1;
p->usesStmtJournal = 0;
for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++){
u8 opcode = pOp->opcode;
if( opcode==OP_Function || opcode==OP_AggStep ){
if( pOp->p5>nMaxArgs ) nMaxArgs = pOp->p5;
#ifndef SQLITE_OMIT_VIRTUALTABLE
}else if( opcode==OP_VUpdate ){
if( pOp->p2>nMaxArgs ) nMaxArgs = pOp->p2;
#endif
}
if( opcode==OP_Halt ){
if( pOp->p1==SQLITE_CONSTRAINT && pOp->p2==OE_Abort ){
doesStatementRollback = 1;
}
}else if( opcode==OP_Statement ){
hasStatementBegin = 1;
p->usesStmtJournal = 1;
}else if( opcode==OP_Destroy ){
doesStatementRollback = 1;
}else if( opcode==OP_Transaction && pOp->p2!=0 ){
p->readOnly = 0;
#ifndef SQLITE_OMIT_VIRTUALTABLE
}else if( opcode==OP_VUpdate || opcode==OP_VRename ){
doesStatementRollback = 1;
}else if( opcode==OP_VFilter ){
int n;
assert( p->nOp - i >= 3 );
assert( pOp[-1].opcode==OP_Integer );
n = pOp[-1].p1;
if( n>nMaxArgs ) nMaxArgs = n;
#endif
}
if( sqlite3VdbeOpcodeHasProperty(opcode, OPFLG_JUMP) && pOp->p2<0 ){
assert( -1-pOp->p2<p->nLabel );
pOp->p2 = aLabel[-1-pOp->p2];
}
}
sqlite3DbFree(p->db, p->aLabel);
p->aLabel = 0;
*pMaxFuncArgs = nMaxArgs;
/* If we never rollback a statement transaction, then statement
** transactions are not needed. So change every OP_Statement
** opcode into an OP_Noop. This avoid a call to sqlite3OsOpenExclusive()
** which can be expensive on some platforms.
*/
if( hasStatementBegin && !doesStatementRollback ){
p->usesStmtJournal = 0;
for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++){
if( pOp->opcode==OP_Statement ){
pOp->opcode = OP_Noop;
}
}
}
}
/*
** Return the address of the next instruction to be inserted.
*/
int sqlite3VdbeCurrentAddr(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 sqlite3VdbeAddOpList(Vdbe *p, int nOp, VdbeOpList const *aOp){
int addr;
assert( p->magic==VDBE_MAGIC_INIT );
if( p->nOp + nOp > p->nOpAlloc && growOpArray(p) ){
return 0;
}
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;
if( p2<0 && sqlite3VdbeOpcodeHasProperty(pOut->opcode, OPFLG_JUMP) ){
pOut->p2 = addr + ADDR(p2);
}else{
pOut->p2 = p2;
}
pOut->p3 = pIn->p3;
pOut->p4type = P4_NOTUSED;
pOut->p4.p = 0;
pOut->p5 = 0;
#ifdef SQLITE_DEBUG
pOut->zComment = 0;
if( sqlite3VdbeAddopTrace ){
sqlite3VdbePrintOp(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 sqlite3VdbeAddOpList but we want to make a
** few minor changes to the program.
*/
void sqlite3VdbeChangeP1(Vdbe *p, int addr, int val){
assert( p==0 || 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 sqlite3VdbeChangeP2(Vdbe *p, int addr, int val){
assert( p==0 || 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.
*/
void sqlite3VdbeChangeP3(Vdbe *p, int addr, int val){
assert( p==0 || p->magic==VDBE_MAGIC_INIT );
if( p && addr>=0 && p->nOp>addr && p->aOp ){
p->aOp[addr].p3 = val;
}
}
/*
** Change the value of the P5 operand for the most recently
** added operation.
*/
void sqlite3VdbeChangeP5(Vdbe *p, u8 val){
assert( p==0 || p->magic==VDBE_MAGIC_INIT );
if( p && p->aOp ){
assert( p->nOp>0 );
p->aOp[p->nOp-1].p5 = val;
}
}
/*
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
void sqlite3VdbeJumpHere(Vdbe *p, int addr){
sqlite3VdbeChangeP2(p, addr, p->nOp);
}
/*
** If the input FuncDef structure is ephemeral, then free it. If
** the FuncDef is not ephermal, then do nothing.
*/
static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef){
if( pDef && (pDef->flags & SQLITE_FUNC_EPHEM)!=0 ){
sqlite3DbFree(db, pDef);
}
}
/*
** Delete a P4 value if necessary.
*/
static void freeP4(sqlite3 *db, int p4type, void *p4){
if( p4 ){
switch( p4type ){
case P4_REAL:
case P4_INT64:
case P4_MPRINTF:
case P4_DYNAMIC:
case P4_KEYINFO:
case P4_INTARRAY:
case P4_KEYINFO_HANDOFF: {
sqlite3DbFree(db, p4);
break;
}
case P4_VDBEFUNC: {
VdbeFunc *pVdbeFunc = (VdbeFunc *)p4;
freeEphemeralFunction(db, pVdbeFunc->pFunc);
sqlite3VdbeDeleteAuxData(pVdbeFunc, 0);
sqlite3DbFree(db, pVdbeFunc);
break;
}
case P4_FUNCDEF: {
freeEphemeralFunction(db, (FuncDef*)p4);
break;
}
case P4_MEM: {
sqlite3ValueFree((sqlite3_value*)p4);
break;
}
}
}
}
/*
** Change N opcodes starting at addr to No-ops.
*/
void sqlite3VdbeChangeToNoop(Vdbe *p, int addr, int N){
if( p && p->aOp ){
VdbeOp *pOp = &p->aOp[addr];
sqlite3 *db = p->db;
while( N-- ){
freeP4(db, pOp->p4type, pOp->p4.p);
memset(pOp, 0, sizeof(pOp[0]));
pOp->opcode = OP_Noop;
pOp++;
}
}
}
/*
** Change the value of the P4 operand for a specific instruction.
** This routine is useful when a large program is loaded from a
** static array using sqlite3VdbeAddOpList but we want to make a
** few minor changes to the program.
**
** If n>=0 then the P4 operand is dynamic, meaning that a copy of
** the string is made into memory obtained from sqlite3_malloc().
** A value of n==0 means copy bytes of zP4 up to and including the
** first null byte. If n>0 then copy n+1 bytes of zP4.
**
** If n==P4_KEYINFO it means that zP4 is a pointer to a KeyInfo structure.
** A copy is made of the KeyInfo structure into memory obtained from
** sqlite3_malloc, to be freed when the Vdbe is finalized.
** n==P4_KEYINFO_HANDOFF indicates that zP4 points to a KeyInfo structure
** stored in memory that the caller has obtained from sqlite3_malloc. The
** caller should not free the allocation, it will be freed when the Vdbe is
** finalized.
**
** Other values of n (P4_STATIC, P4_COLLSEQ etc.) indicate that zP4 points
** to a string or structure that is guaranteed to exist for the lifetime of
** the Vdbe. In these cases we can just copy the pointer.
**
** If addr<0 then change P4 on the most recently inserted instruction.
*/
void sqlite3VdbeChangeP4(Vdbe *p, int addr, const char *zP4, int n){
Op *pOp;
sqlite3 *db;
assert( p!=0 );
db = p->db;
assert( p->magic==VDBE_MAGIC_INIT );
if( p->aOp==0 || db->mallocFailed ){
if (n != P4_KEYINFO) {
freeP4(db, n, (void*)*(char**)&zP4);
}
return;
}
assert( addr<p->nOp );
if( addr<0 ){
addr = p->nOp - 1;
if( addr<0 ) return;
}
pOp = &p->aOp[addr];
freeP4(db, pOp->p4type, pOp->p4.p);
pOp->p4.p = 0;
if( n==P4_INT32 ){
/* Note: this cast is safe, because the origin data point was an int
** that was cast to a (const char *). */
pOp->p4.i = SQLITE_PTR_TO_INT(zP4);
pOp->p4type = P4_INT32;
}else if( zP4==0 ){
pOp->p4.p = 0;
pOp->p4type = P4_NOTUSED;
}else if( n==P4_KEYINFO ){
KeyInfo *pKeyInfo;
int nField, nByte;
nField = ((KeyInfo*)zP4)->nField;
nByte = sizeof(*pKeyInfo) + (nField-1)*sizeof(pKeyInfo->aColl[0]) + nField;
pKeyInfo = sqlite3Malloc( nByte );
pOp->p4.pKeyInfo = pKeyInfo;
if( pKeyInfo ){
u8 *aSortOrder;
memcpy(pKeyInfo, zP4, nByte);
aSortOrder = pKeyInfo->aSortOrder;
if( aSortOrder ){
pKeyInfo->aSortOrder = (unsigned char*)&pKeyInfo->aColl[nField];
memcpy(pKeyInfo->aSortOrder, aSortOrder, nField);
}
pOp->p4type = P4_KEYINFO;
}else{
p->db->mallocFailed = 1;
pOp->p4type = P4_NOTUSED;
}
}else if( n==P4_KEYINFO_HANDOFF ){
pOp->p4.p = (void*)zP4;
pOp->p4type = P4_KEYINFO;
}else if( n<0 ){
pOp->p4.p = (void*)zP4;
pOp->p4type = (signed char)n;
}else{
if( n==0 ) n = sqlite3Strlen30(zP4);
pOp->p4.z = sqlite3DbStrNDup(p->db, zP4, n);
pOp->p4type = P4_DYNAMIC;
}
}
#ifndef NDEBUG
/*
** Change the comment on the the most recently coded instruction. Or
** insert a No-op and add the comment to that new instruction. This
** makes the code easier to read during debugging. None of this happens
** in a production build.
*/
void sqlite3VdbeComment(Vdbe *p, const char *zFormat, ...){
va_list ap;
assert( p->nOp>0 || p->aOp==0 );
assert( p->aOp==0 || p->aOp[p->nOp-1].zComment==0 || p->db->mallocFailed );
if( p->nOp ){
char **pz = &p->aOp[p->nOp-1].zComment;
va_start(ap, zFormat);
sqlite3DbFree(p->db, *pz);
*pz = sqlite3VMPrintf(p->db, zFormat, ap);
va_end(ap);
}
}
void sqlite3VdbeNoopComment(Vdbe *p, const char *zFormat, ...){
va_list ap;
sqlite3VdbeAddOp0(p, OP_Noop);
assert( p->nOp>0 || p->aOp==0 );
assert( p->aOp==0 || p->aOp[p->nOp-1].zComment==0 || p->db->mallocFailed );
if( p->nOp ){
char **pz = &p->aOp[p->nOp-1].zComment;
va_start(ap, zFormat);
sqlite3DbFree(p->db, *pz);
*pz = sqlite3VMPrintf(p->db, zFormat, ap);
va_end(ap);
}
}
#endif /* NDEBUG */
/*
** Return the opcode for a given address.
*/
VdbeOp *sqlite3VdbeGetOp(Vdbe *p, int addr){
assert( p->magic==VDBE_MAGIC_INIT );
assert( (addr>=0 && addr<p->nOp) || p->db->mallocFailed );
return ((addr>=0 && addr<p->nOp)?(&p->aOp[addr]):0);
}
#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
|| defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
/*
** Compute a string that describes the P4 parameter for an opcode.
** Use zTemp for any required temporary buffer space.
*/
static char *displayP4(Op *pOp, char *zTemp, int nTemp){
char *zP4 = zTemp;
assert( nTemp>=20 );
switch( pOp->p4type ){
case P4_KEYINFO_STATIC:
case P4_KEYINFO: {
int i, j;
KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
sqlite3_snprintf(nTemp, zTemp, "keyinfo(%d", pKeyInfo->nField);
i = sqlite3Strlen30(zTemp);
for(j=0; j<pKeyInfo->nField; j++){
CollSeq *pColl = pKeyInfo->aColl[j];
if( pColl ){
int n = sqlite3Strlen30(pColl->zName);
if( i+n>nTemp-6 ){
memcpy(&zTemp[i],",...",4);
break;
}
zTemp[i++] = ',';
if( pKeyInfo->aSortOrder && pKeyInfo->aSortOrder[j] ){
zTemp[i++] = '-';
}
memcpy(&zTemp[i], pColl->zName,n+1);
i += n;
}else if( i+4<nTemp-6 ){
memcpy(&zTemp[i],",nil",4);
i += 4;
}
}
zTemp[i++] = ')';
zTemp[i] = 0;
assert( i<nTemp );
break;
}
case P4_COLLSEQ: {
CollSeq *pColl = pOp->p4.pColl;
sqlite3_snprintf(nTemp, zTemp, "collseq(%.20s)", pColl->zName);
break;
}
case P4_FUNCDEF: {
FuncDef *pDef = pOp->p4.pFunc;
sqlite3_snprintf(nTemp, zTemp, "%s(%d)", pDef->zName, pDef->nArg);
break;
}
case P4_INT64: {
sqlite3_snprintf(nTemp, zTemp, "%lld", *pOp->p4.pI64);
break;
}
case P4_INT32: {
sqlite3_snprintf(nTemp, zTemp, "%d", pOp->p4.i);
break;
}
case P4_REAL: {
sqlite3_snprintf(nTemp, zTemp, "%.16g", *pOp->p4.pReal);
break;
}
case P4_MEM: {
Mem *pMem = pOp->p4.pMem;
assert( (pMem->flags & MEM_Null)==0 );
if( pMem->flags & MEM_Str ){
zP4 = pMem->z;
}else if( pMem->flags & MEM_Int ){
sqlite3_snprintf(nTemp, zTemp, "%lld", pMem->u.i);
}else if( pMem->flags & MEM_Real ){
sqlite3_snprintf(nTemp, zTemp, "%.16g", pMem->r);
}
break;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
case P4_VTAB: {
sqlite3_vtab *pVtab = pOp->p4.pVtab;
sqlite3_snprintf(nTemp, zTemp, "vtab:%p:%p", pVtab, pVtab->pModule);
break;
}
#endif
case P4_INTARRAY: {
sqlite3_snprintf(nTemp, zTemp, "intarray");
break;
}
default: {
zP4 = pOp->p4.z;
if( zP4==0 ){
zP4 = zTemp;
zTemp[0] = 0;
}
}
}
assert( zP4!=0 );
return zP4;
}
#endif
/*
** Declare to the Vdbe that the BTree object at db->aDb[i] is used.
**
*/
void sqlite3VdbeUsesBtree(Vdbe *p, int i){
int mask;
assert( i>=0 && i<p->db->nDb );
assert( i<(int)sizeof(p->btreeMask)*8 );
mask = 1<<i;
if( (p->btreeMask & mask)==0 ){
p->btreeMask |= mask;
sqlite3BtreeMutexArrayInsert(&p->aMutex, p->db->aDb[i].pBt);
}
}
#if defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
/*
** Print a single opcode. This routine is used for debugging only.
*/
void sqlite3VdbePrintOp(FILE *pOut, int pc, Op *pOp){
char *zP4;
char zPtr[50];
static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-4s %.2X %s\n";
if( pOut==0 ) pOut = stdout;
zP4 = displayP4(pOp, zPtr, sizeof(zPtr));
fprintf(pOut, zFormat1, pc,
sqlite3OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3, zP4, pOp->p5,
#ifdef SQLITE_DEBUG
pOp->zComment ? pOp->zComment : ""
#else
""
#endif
);
fflush(pOut);
}
#endif
/*
** Release an array of N Mem elements
*/
static void releaseMemArray(Mem *p, int N){
if( p && N ){
Mem *pEnd;
sqlite3 *db = p->db;
u8 malloc_failed = db->mallocFailed;
for(pEnd=&p[N]; p<pEnd; p++){
assert( (&p[1])==pEnd || p[0].db==p[1].db );
/* This block is really an inlined version of sqlite3VdbeMemRelease()
** that takes advantage of the fact that the memory cell value is
** being set to NULL after releasing any dynamic resources.
**
** The justification for duplicating code is that according to
** callgrind, this causes a certain test case to hit the CPU 4.7
** percent less (x86 linux, gcc version 4.1.2, -O6) than if
** sqlite3MemRelease() were called from here. With -O2, this jumps
** to 6.6 percent. The test case is inserting 1000 rows into a table
** with no indexes using a single prepared INSERT statement, bind()
** and reset(). Inserts are grouped into a transaction.
*/
if( p->flags&(MEM_Agg|MEM_Dyn) ){
sqlite3VdbeMemRelease(p);
}else if( p->zMalloc ){
sqlite3DbFree(db, p->zMalloc);
p->zMalloc = 0;
}
p->flags = MEM_Null;
}
db->mallocFailed = malloc_failed;
}
}
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
int sqlite3VdbeReleaseBuffers(Vdbe *p){
int ii;
int nFree = 0;
assert( sqlite3_mutex_held(p->db->mutex) );
for(ii=1; ii<=p->nMem; ii++){
Mem *pMem = &p->aMem[ii];
if( pMem->flags & MEM_RowSet ){
sqlite3RowSetClear(pMem->u.pRowSet);
}
if( pMem->z && pMem->flags&MEM_Dyn ){
assert( !pMem->xDel );
nFree += sqlite3DbMallocSize(pMem->db, pMem->z);
sqlite3VdbeMemRelease(pMem);
}
}
return nFree;
}
#endif
#ifndef SQLITE_OMIT_EXPLAIN
/*
** Give a listing of the program in the virtual machine.
**
** The interface is the same as sqlite3VdbeExec(). But instead of
** running the code, it invokes the callback once for each instruction.
** This feature is used to implement "EXPLAIN".
**
** When p->explain==1, each instruction is listed. When
** p->explain==2, only OP_Explain instructions are listed and these
** are shown in a different format. p->explain==2 is used to implement
** EXPLAIN QUERY PLAN.
*/
int sqlite3VdbeList(
Vdbe *p /* The VDBE */
){
sqlite3 *db = p->db;
int i;
int rc = SQLITE_OK;
Mem *pMem = p->pResultSet = &p->aMem[1];
assert( p->explain );
if( p->magic!=VDBE_MAGIC_RUN ) return SQLITE_MISUSE;
assert( db->magic==SQLITE_MAGIC_BUSY );
assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY || p->rc==SQLITE_NOMEM );
/* Even though this opcode does not use dynamic strings for
** the result, result columns may become dynamic if the user calls
** sqlite3_column_text16(), causing a translation to UTF-16 encoding.
*/
releaseMemArray(pMem, p->nMem);
if( p->rc==SQLITE_NOMEM ){
/* This happens if a malloc() inside a call to sqlite3_column_text() or
** sqlite3_column_text16() failed. */
db->mallocFailed = 1;
return SQLITE_ERROR;
}
do{
i = p->pc++;
}while( i<p->nOp && p->explain==2 && p->aOp[i].opcode!=OP_Explain );
if( i>=p->nOp ){
p->rc = SQLITE_OK;
rc = SQLITE_DONE;
}else if( db->u1.isInterrupted ){
p->rc = SQLITE_INTERRUPT;
rc = SQLITE_ERROR;
sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3ErrStr(p->rc));
}else{
char *z;
Op *pOp = &p->aOp[i];
if( p->explain==1 ){
pMem->flags = MEM_Int;
pMem->type = SQLITE_INTEGER;
pMem->u.i = i; /* Program counter */
pMem++;
pMem->flags = MEM_Static|MEM_Str|MEM_Term;
pMem->z = (char*)sqlite3OpcodeName(pOp->opcode); /* Opcode */
assert( pMem->z!=0 );
pMem->n = sqlite3Strlen30(pMem->z);
pMem->type = SQLITE_TEXT;
pMem->enc = SQLITE_UTF8;
pMem++;
}
pMem->flags = MEM_Int;
pMem->u.i = pOp->p1; /* P1 */
pMem->type = SQLITE_INTEGER;
pMem++;
pMem->flags = MEM_Int;
pMem->u.i = pOp->p2; /* P2 */
pMem->type = SQLITE_INTEGER;
pMem++;
if( p->explain==1 ){
pMem->flags = MEM_Int;
pMem->u.i = pOp->p3; /* P3 */
pMem->type = SQLITE_INTEGER;
pMem++;
}
if( sqlite3VdbeMemGrow(pMem, 32, 0) ){ /* P4 */
p->db->mallocFailed = 1;
return SQLITE_NOMEM;
}
pMem->flags = MEM_Dyn|MEM_Str|MEM_Term;
z = displayP4(pOp, pMem->z, 32);
if( z!=pMem->z ){
sqlite3VdbeMemSetStr(pMem, z, -1, SQLITE_UTF8, 0);
}else{
assert( pMem->z!=0 );
pMem->n = sqlite3Strlen30(pMem->z);
pMem->enc = SQLITE_UTF8;
}
pMem->type = SQLITE_TEXT;
pMem++;
if( p->explain==1 ){
if( sqlite3VdbeMemGrow(pMem, 4, 0) ){
p->db->mallocFailed = 1;
return SQLITE_NOMEM;
}
pMem->flags = MEM_Dyn|MEM_Str|MEM_Term;
pMem->n = 2;
sqlite3_snprintf(3, pMem->z, "%.2x", pOp->p5); /* P5 */
pMem->type = SQLITE_TEXT;
pMem->enc = SQLITE_UTF8;
pMem++;
#ifdef SQLITE_DEBUG
if( pOp->zComment ){
pMem->flags = MEM_Str|MEM_Term;
pMem->z = pOp->zComment;
pMem->n = sqlite3Strlen30(pMem->z);
pMem->enc = SQLITE_UTF8;
pMem->type = SQLITE_TEXT;
}else
#endif
{
pMem->flags = MEM_Null; /* Comment */
pMem->type = SQLITE_NULL;
}
}
p->nResColumn = 8 - 5*(p->explain-1);
p->rc = SQLITE_OK;
rc = SQLITE_ROW;
}
return rc;
}
#endif /* SQLITE_OMIT_EXPLAIN */
#ifdef SQLITE_DEBUG
/*
** Print the SQL that was used to generate a VDBE program.
*/
void sqlite3VdbePrintSql(Vdbe *p){
int nOp = p->nOp;
VdbeOp *pOp;
if( nOp<1 ) return;
pOp = &p->aOp[0];
if( pOp->opcode==OP_Trace && pOp->p4.z!=0 ){
const char *z = pOp->p4.z;
while( isspace(*(u8*)z) ) z++;
printf("SQL: [%s]\n", z);
}
}
#endif
#if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE)
/*
** Print an IOTRACE message showing SQL content.
*/
void sqlite3VdbeIOTraceSql(Vdbe *p){
int nOp = p->nOp;
VdbeOp *pOp;
if( sqlite3IoTrace==0 ) return;
if( nOp<1 ) return;
pOp = &p->aOp[0];
if( pOp->opcode==OP_Trace && pOp->p4.z!=0 ){
int i, j;
char z[1000];
sqlite3_snprintf(sizeof(z), z, "%s", pOp->p4.z);
for(i=0; isspace((unsigned char)z[i]); i++){}
for(j=0; z[i]; i++){
if( isspace((unsigned char)z[i]) ){
if( z[i-1]!=' ' ){
z[j++] = ' ';
}
}else{
z[j++] = z[i];
}
}
z[j] = 0;
sqlite3IoTrace("SQL %s\n", z);
}
}
#endif /* !SQLITE_OMIT_TRACE && SQLITE_ENABLE_IOTRACE */
/*
** 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 sqlite3VdbeExec().
**
** This is the only way to move a VDBE from VDBE_MAGIC_INIT to
** VDBE_MAGIC_RUN.
*/
void sqlite3VdbeMakeReady(
Vdbe *p, /* The VDBE */
int nVar, /* Number of '?' see in the SQL statement */
int nMem, /* Number of memory cells to allocate */
int nCursor, /* Number of cursors to allocate */
int isExplain /* True if the EXPLAIN keywords is present */
){
int n;
sqlite3 *db = p->db;
assert( p!=0 );
assert( p->magic==VDBE_MAGIC_INIT );
/* There should be at least one opcode.
*/
assert( p->nOp>0 );
/* Set the magic to VDBE_MAGIC_RUN sooner rather than later. */
p->magic = VDBE_MAGIC_RUN;
/* For each cursor required, also allocate a memory cell. Memory
** cells (nMem+1-nCursor)..nMem, inclusive, will never be used by
** the vdbe program. Instead they are used to allocate space for
** VdbeCursor/BtCursor structures. The blob of memory associated with
** cursor 0 is stored in memory cell nMem. Memory cell (nMem-1)
** stores the blob of memory associated with cursor 1, etc.
**
** See also: allocateCursor().
*/
nMem += nCursor;
/*
** Allocation space for registers.
*/
if( p->aMem==0 ){
int nArg; /* Maximum number of args passed to a user function. */
resolveP2Values(p, &nArg);
assert( nVar>=0 );
if( isExplain && nMem<10 ){
nMem = 10;
}
p->aMem = sqlite3DbMallocZero(db,
nMem*sizeof(Mem) /* aMem */
+ nVar*sizeof(Mem) /* aVar */
+ nArg*sizeof(Mem*) /* apArg */
+ nVar*sizeof(char*) /* azVar */
+ nCursor*sizeof(VdbeCursor*)+1 /* apCsr */
);
if( !db->mallocFailed ){
p->aMem--; /* aMem[] goes from 1..nMem */
p->nMem = nMem; /* not from 0..nMem-1 */
p->aVar = &p->aMem[nMem+1];
p->nVar = nVar;
p->okVar = 0;
p->apArg = (Mem**)&p->aVar[nVar];
p->azVar = (char**)&p->apArg[nArg];
p->apCsr = (VdbeCursor**)&p->azVar[nVar];
p->nCursor = nCursor;
for(n=0; n<nVar; n++){
p->aVar[n].flags = MEM_Null;
p->aVar[n].db = db;
}
for(n=1; n<=nMem; n++){
p->aMem[n].flags = MEM_Null;
p->aMem[n].db = db;
}
}
}
#ifdef SQLITE_DEBUG
for(n=1; n<p->nMem; n++){
assert( p->aMem[n].db==db );
}
#endif
p->pc = -1;
p->rc = SQLITE_OK;
p->uniqueCnt = 0;
p->errorAction = OE_Abort;
p->explain |= isExplain;
p->magic = VDBE_MAGIC_RUN;
p->nChange = 0;
p->cacheCtr = 1;
p->minWriteFileFormat = 255;
p->openedStatement = 0;
#ifdef VDBE_PROFILE
{
int i;
for(i=0; i<p->nOp; i++){
p->aOp[i].cnt = 0;
p->aOp[i].cycles = 0;
}
}
#endif
}
/*
** Close a VDBE cursor and release all the resources that cursor
** happens to hold.
*/
void sqlite3VdbeFreeCursor(Vdbe *p, VdbeCursor *pCx){
if( pCx==0 ){
return;
}
if( pCx->pBt ){
sqlite3BtreeClose(pCx->pBt);
/* The pCx->pCursor will be close automatically, if it exists, by
** the call above. */
}else if( pCx->pCursor ){
sqlite3BtreeCloseCursor(pCx->pCursor);
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( pCx->pVtabCursor ){
sqlite3_vtab_cursor *pVtabCursor = pCx->pVtabCursor;
const sqlite3_module *pModule = pCx->pModule;
p->inVtabMethod = 1;
(void)sqlite3SafetyOff(p->db);
pModule->xClose(pVtabCursor);
(void)sqlite3SafetyOn(p->db);
p->inVtabMethod = 0;
}
#endif
if( !pCx->ephemPseudoTable ){
sqlite3DbFree(p->db, pCx->pData);
}
}
/*
** Close all cursors except for VTab cursors that are currently
** in use.
*/
static void closeAllCursorsExceptActiveVtabs(Vdbe *p){
int i;
if( p->apCsr==0 ) return;
for(i=0; i<p->nCursor; i++){
VdbeCursor *pC = p->apCsr[i];
if( pC && (!p->inVtabMethod || !pC->pVtabCursor) ){
sqlite3VdbeFreeCursor(p, pC);
p->apCsr[i] = 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 aVar[] array.
*/
static void Cleanup(Vdbe *p){
int i;
sqlite3 *db = p->db;
Mem *pMem;
closeAllCursorsExceptActiveVtabs(p);
for(pMem=&p->aMem[1], i=1; i<=p->nMem; i++, pMem++){
if( pMem->flags & MEM_RowSet ){
sqlite3RowSetClear(pMem->u.pRowSet);
}
MemSetTypeFlag(pMem, MEM_Null);
}
releaseMemArray(&p->aMem[1], p->nMem);
if( p->contextStack ){
sqlite3DbFree(db, p->contextStack);
}
p->contextStack = 0;
p->contextStackDepth = 0;
p->contextStackTop = 0;
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
p->pResultSet = 0;
}
/*
** Set the number of result columns that will be returned by this SQL
** statement. This is now set at compile time, rather than during
** execution of the vdbe program so that sqlite3_column_count() can
** be called on an SQL statement before sqlite3_step().
*/
void sqlite3VdbeSetNumCols(Vdbe *p, int nResColumn){
Mem *pColName;
int n;
sqlite3 *db = p->db;
releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
sqlite3DbFree(db, p->aColName);
n = nResColumn*COLNAME_N;
p->nResColumn = nResColumn;
p->aColName = pColName = (Mem*)sqlite3DbMallocZero(db, sizeof(Mem)*n );
if( p->aColName==0 ) return;
while( n-- > 0 ){
pColName->flags = MEM_Null;
pColName->db = p->db;
pColName++;
}
}
/*
** Set the name of the idx'th column to be returned by the SQL statement.
** zName must be a pointer to a nul terminated string.
**
** This call must be made after a call to sqlite3VdbeSetNumCols().
**
** The final parameter, xDel, must be one of SQLITE_DYNAMIC, SQLITE_STATIC
** or SQLITE_TRANSIENT. If it is SQLITE_DYNAMIC, then the buffer pointed
** to by zName will be freed by sqlite3DbFree() when the vdbe is destroyed.
*/
int sqlite3VdbeSetColName(
Vdbe *p, /* Vdbe being configured */
int idx, /* Index of column zName applies to */
int var, /* One of the COLNAME_* constants */
const char *zName, /* Pointer to buffer containing name */
void (*xDel)(void*) /* Memory management strategy for zName */
){
int rc;
Mem *pColName;
assert( idx<p->nResColumn );
assert( var<COLNAME_N );
if( p->db->mallocFailed ){
assert( !zName || xDel!=SQLITE_DYNAMIC );
return SQLITE_NOMEM;
}
assert( p->aColName!=0 );
pColName = &(p->aColName[idx+var*p->nResColumn]);
rc = sqlite3VdbeMemSetStr(pColName, zName, -1, SQLITE_UTF8, xDel);
assert( rc!=0 || !zName || (pColName->flags&MEM_Term)!=0 );
return rc;
}
/*
** A read or write transaction may or may not be active on database handle
** db. If a transaction is active, commit it. If there is a
** write-transaction spanning more than one database file, this routine
** takes care of the master journal trickery.
*/
static int vdbeCommit(sqlite3 *db, Vdbe *p){
int i;
int nTrans = 0; /* Number of databases with an active write-transaction */
int rc = SQLITE_OK;
int needXcommit = 0;
/* Before doing anything else, call the xSync() callback for any
** virtual module tables written in this transaction. This has to
** be done before determining whether a master journal file is
** required, as an xSync() callback may add an attached database
** to the transaction.
*/
rc = sqlite3VtabSync(db, &p->zErrMsg);
if( rc!=SQLITE_OK ){
return rc;
}
/* This loop determines (a) if the commit hook should be invoked and
** (b) how many database files have open write transactions, not
** including the temp database. (b) is important because if more than
** one database file has an open write transaction, a master journal
** file is required for an atomic commit.
*/
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( sqlite3BtreeIsInTrans(pBt) ){
needXcommit = 1;
if( i!=1 ) nTrans++;
}
}
/* If there are any write-transactions at all, invoke the commit hook */
if( needXcommit && db->xCommitCallback ){
assert( (db->flags & SQLITE_CommitBusy)==0 );
db->flags |= SQLITE_CommitBusy;
(void)sqlite3SafetyOff(db);
rc = db->xCommitCallback(db->pCommitArg);
(void)sqlite3SafetyOn(db);
db->flags &= ~SQLITE_CommitBusy;
if( rc ){
return SQLITE_CONSTRAINT;
}
}
/* The simple case - no more than one database file (not counting the
** TEMP database) has a transaction active. There is no need for the
** master-journal.
**
** If the return value of sqlite3BtreeGetFilename() is a zero length
** string, it means the main database is :memory: or a temp file. In
** that case we do not support atomic multi-file commits, so use the
** simple case then too.
*/
if( 0==sqlite3Strlen30(sqlite3BtreeGetFilename(db->aDb[0].pBt))
|| nTrans<=1
){
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseOne(pBt, 0);
}
}
/* Do the commit only if all databases successfully complete phase 1.
** If one of the BtreeCommitPhaseOne() calls fails, this indicates an
** IO error while deleting or truncating a journal file. It is unlikely,
** but could happen. In this case abandon processing and return the error.
*/
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseTwo(pBt);
}
}
if( rc==SQLITE_OK ){
sqlite3VtabCommit(db);
}
}
/* The complex case - There is a multi-file write-transaction active.
** This requires a master journal file to ensure the transaction is
** committed atomicly.
*/
#ifndef SQLITE_OMIT_DISKIO
else{
sqlite3_vfs *pVfs = db->pVfs;
int needSync = 0;
char *zMaster = 0; /* File-name for the master journal */
char const *zMainFile = sqlite3BtreeGetFilename(db->aDb[0].pBt);
sqlite3_file *pMaster = 0;
i64 offset = 0;
int res;
/* Select a master journal file name */
do {
u32 iRandom;
sqlite3DbFree(db, zMaster);
sqlite3_randomness(sizeof(iRandom), &iRandom);
zMaster = sqlite3MPrintf(db, "%s-mj%08X", zMainFile, iRandom&0x7fffffff);
if( !zMaster ){
return SQLITE_NOMEM;
}
rc = sqlite3OsAccess(pVfs, zMaster, SQLITE_ACCESS_EXISTS, &res);
}while( rc==SQLITE_OK && res );
if( rc==SQLITE_OK ){
/* Open the master journal. */
rc = sqlite3OsOpenMalloc(pVfs, zMaster, &pMaster,
SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|
SQLITE_OPEN_EXCLUSIVE|SQLITE_OPEN_MASTER_JOURNAL, 0
);
}
if( rc!=SQLITE_OK ){
sqlite3DbFree(db, zMaster);
return rc;
}
/* Write the name of each database file in the transaction into the new
** master journal file. If an error occurs at this point close
** and delete the master journal file. All the individual journal files
** still have 'null' as the master journal pointer, so they will roll
** back independently if a failure occurs.
*/
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( i==1 ) continue; /* Ignore the TEMP database */
if( sqlite3BtreeIsInTrans(pBt) ){
char const *zFile = sqlite3BtreeGetJournalname(pBt);
if( zFile[0]==0 ) continue; /* Ignore :memory: databases */
if( !needSync && !sqlite3BtreeSyncDisabled(pBt) ){
needSync = 1;
}
rc = sqlite3OsWrite(pMaster, zFile, sqlite3Strlen30(zFile)+1, offset);
offset += sqlite3Strlen30(zFile)+1;
if( rc!=SQLITE_OK ){
sqlite3OsCloseFree(pMaster);
sqlite3OsDelete(pVfs, zMaster, 0);
sqlite3DbFree(db, zMaster);
return rc;
}
}
}
/* Sync the master journal file. If the IOCAP_SEQUENTIAL device
** flag is set this is not required.
*/
zMainFile = sqlite3BtreeGetDirname(db->aDb[0].pBt);
if( (needSync
&& (0==(sqlite3OsDeviceCharacteristics(pMaster)&SQLITE_IOCAP_SEQUENTIAL))
&& (rc=sqlite3OsSync(pMaster, SQLITE_SYNC_NORMAL))!=SQLITE_OK) ){
sqlite3OsCloseFree(pMaster);
sqlite3OsDelete(pVfs, zMaster, 0);
sqlite3DbFree(db, zMaster);
return rc;
}
/* Sync all the db files involved in the transaction. The same call
** sets the master journal pointer in each individual journal. If
** an error occurs here, do not delete the master journal file.
**
** If the error occurs during the first call to
** sqlite3BtreeCommitPhaseOne(), then there is a chance that the
** master journal file will be orphaned. But we cannot delete it,
** in case the master journal file name was written into the journal
** file before the failure occured.
*/
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseOne(pBt, zMaster);
}
}
sqlite3OsCloseFree(pMaster);
if( rc!=SQLITE_OK ){
sqlite3DbFree(db, zMaster);
return rc;
}
/* Delete the master journal file. This commits the transaction. After
** doing this the directory is synced again before any individual
** transaction files are deleted.
*/
rc = sqlite3OsDelete(pVfs, zMaster, 1);
sqlite3DbFree(db, zMaster);
zMaster = 0;
if( rc ){
return rc;
}
/* All files and directories have already been synced, so the following
** calls to sqlite3BtreeCommitPhaseTwo() are only closing files and
** deleting or truncating journals. If something goes wrong while
** this is happening we don't really care. The integrity of the
** transaction is already guaranteed, but some stray 'cold' journals
** may be lying around. Returning an error code won't help matters.
*/
disable_simulated_io_errors();
sqlite3BeginBenignMalloc();
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
sqlite3BtreeCommitPhaseTwo(pBt);
}
}
sqlite3EndBenignMalloc();
enable_simulated_io_errors();
sqlite3VtabCommit(db);
}
#endif
return rc;
}
/*
** This routine checks that the sqlite3.activeVdbeCnt count variable
** matches the number of vdbe's in the list sqlite3.pVdbe that are
** currently active. An assertion fails if the two counts do not match.
** This is an internal self-check only - it is not an essential processing
** step.
**
** This is a no-op if NDEBUG is defined.
*/
#ifndef NDEBUG
static void checkActiveVdbeCnt(sqlite3 *db){
Vdbe *p;
int cnt = 0;
int nWrite = 0;
p = db->pVdbe;
while( p ){
if( p->magic==VDBE_MAGIC_RUN && p->pc>=0 ){
cnt++;
if( p->readOnly==0 ) nWrite++;
}
p = p->pNext;
}
assert( cnt==db->activeVdbeCnt );
assert( nWrite==db->writeVdbeCnt );
}
#else
#define checkActiveVdbeCnt(x)
#endif
/*
** For every Btree that in database connection db which
** has been modified, "trip" or invalidate each cursor in
** that Btree might have been modified so that the cursor
** can never be used again. This happens when a rollback
*** occurs. We have to trip all the other cursors, even
** cursor from other VMs in different database connections,
** so that none of them try to use the data at which they
** were pointing and which now may have been changed due
** to the rollback.
**
** Remember that a rollback can delete tables complete and
** reorder rootpages. So it is not sufficient just to save
** the state of the cursor. We have to invalidate the cursor
** so that it is never used again.
*/
static void invalidateCursorsOnModifiedBtrees(sqlite3 *db){
int i;
for(i=0; i<db->nDb; i++){
Btree *p = db->aDb[i].pBt;
if( p && sqlite3BtreeIsInTrans(p) ){
sqlite3BtreeTripAllCursors(p, SQLITE_ABORT);
}
}
}
/*
** This routine is called the when a VDBE tries to halt. If the VDBE
** has made changes and is in autocommit mode, then commit those
** changes. If a rollback is needed, then do the rollback.
**
** This routine is the only way to move the state of a VM from
** SQLITE_MAGIC_RUN to SQLITE_MAGIC_HALT. It is harmless to
** call this on a VM that is in the SQLITE_MAGIC_HALT state.
**
** Return an error code. If the commit could not complete because of
** lock contention, return SQLITE_BUSY. If SQLITE_BUSY is returned, it
** means the close did not happen and needs to be repeated.
*/
int sqlite3VdbeHalt(Vdbe *p){
sqlite3 *db = p->db;
int i;
int (*xFunc)(Btree *pBt) = 0; /* Function to call on each btree backend */
int isSpecialError; /* Set to true if SQLITE_NOMEM or IOERR */
/* This function contains the logic that determines if a statement or
** transaction will be committed or rolled back as a result of the
** execution of this virtual machine.
**
** If any of the following errors occur:
**
** SQLITE_NOMEM
** SQLITE_IOERR
** SQLITE_FULL
** SQLITE_INTERRUPT
**
** Then the internal cache might have been left in an inconsistent
** state. We need to rollback the statement transaction, if there is
** one, or the complete transaction if there is no statement transaction.
*/
if( p->db->mallocFailed ){
p->rc = SQLITE_NOMEM;
}
closeAllCursorsExceptActiveVtabs(p);
if( p->magic!=VDBE_MAGIC_RUN ){
return SQLITE_OK;
}
checkActiveVdbeCnt(db);
/* No commit or rollback needed if the program never started */
if( p->pc>=0 ){
int mrc; /* Primary error code from p->rc */
/* Lock all btrees used by the statement */
sqlite3BtreeMutexArrayEnter(&p->aMutex);
/* Check for one of the special errors */
mrc = p->rc & 0xff;
isSpecialError = mrc==SQLITE_NOMEM || mrc==SQLITE_IOERR
|| mrc==SQLITE_INTERRUPT || mrc==SQLITE_FULL;
if( isSpecialError ){
/* If the query was read-only, we need do no rollback at all. Otherwise,
** proceed with the special handling.
*/
if( !p->readOnly || mrc!=SQLITE_INTERRUPT ){
if( p->rc==SQLITE_IOERR_BLOCKED && p->usesStmtJournal ){
xFunc = sqlite3BtreeRollbackStmt;
p->rc = SQLITE_BUSY;
}else if( (mrc==SQLITE_NOMEM || mrc==SQLITE_FULL)
&& p->usesStmtJournal ){
xFunc = sqlite3BtreeRollbackStmt;
}else{
/* We are forced to roll back the active transaction. Before doing
** so, abort any other statements this handle currently has active.
*/
invalidateCursorsOnModifiedBtrees(db);
sqlite3RollbackAll(db);
sqlite3CloseSavepoints(db);
db->autoCommit = 1;
}
}
}
/* If the auto-commit flag is set and this is the only active vdbe, then
** we do either a commit or rollback of the current transaction.
**
** Note: This block also runs if one of the special errors handled
** above has occurred.
*/
if( !sqlite3VtabInSync(db)
&& db->autoCommit
&& db->writeVdbeCnt==(p->readOnly==0)
&& (db->flags & SQLITE_CommitBusy)==0
){
if( p->rc==SQLITE_OK || (p->errorAction==OE_Fail && !isSpecialError) ){
/* The auto-commit flag is true, and the vdbe program was
** successful or hit an 'OR FAIL' constraint. This means a commit
** is required.
*/
int rc = vdbeCommit(db, p);
if( rc==SQLITE_BUSY ){
sqlite3BtreeMutexArrayLeave(&p->aMutex);
return SQLITE_BUSY;
}else if( rc!=SQLITE_OK ){
p->rc = rc;
sqlite3RollbackAll(db);
}else{
sqlite3CommitInternalChanges(db);
}
}else{
sqlite3RollbackAll(db);
}
}else if( !xFunc ){
if( p->rc==SQLITE_OK || p->errorAction==OE_Fail ){
if( p->openedStatement ){
xFunc = sqlite3BtreeCommitStmt;
}
}else if( p->errorAction==OE_Abort ){
xFunc = sqlite3BtreeRollbackStmt;
}else{
invalidateCursorsOnModifiedBtrees(db);
sqlite3RollbackAll(db);
sqlite3CloseSavepoints(db);
db->autoCommit = 1;
}
}
/* If xFunc is not NULL, then it is one of sqlite3BtreeRollbackStmt or
** sqlite3BtreeCommitStmt. Call it once on each backend. If an error occurs
** and the return code is still SQLITE_OK, set the return code to the new
** error value.
*/
assert(!xFunc ||
xFunc==sqlite3BtreeCommitStmt ||
xFunc==sqlite3BtreeRollbackStmt
);
for(i=0; xFunc && i<db->nDb; i++){
int rc;
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = xFunc(pBt);
if( rc && (p->rc==SQLITE_OK || p->rc==SQLITE_CONSTRAINT) ){
p->rc = rc;
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
}
}
}
/* If this was an INSERT, UPDATE or DELETE and the statement was committed,
** set the change counter.
*/
if( p->changeCntOn && p->pc>=0 ){
if( !xFunc || xFunc==sqlite3BtreeCommitStmt ){
sqlite3VdbeSetChanges(db, p->nChange);
}else{
sqlite3VdbeSetChanges(db, 0);
}
p->nChange = 0;
}
/* Rollback or commit any schema changes that occurred. */
if( p->rc!=SQLITE_OK && db->flags&SQLITE_InternChanges ){
sqlite3ResetInternalSchema(db, 0);
db->flags = (db->flags | SQLITE_InternChanges);
}
/* Release the locks */
sqlite3BtreeMutexArrayLeave(&p->aMutex);
}
/* We have successfully halted and closed the VM. Record this fact. */
if( p->pc>=0 ){
db->activeVdbeCnt--;
if( !p->readOnly ){
db->writeVdbeCnt--;
}
assert( db->activeVdbeCnt>=db->writeVdbeCnt );
}
p->magic = VDBE_MAGIC_HALT;
checkActiveVdbeCnt(db);
if( p->db->mallocFailed ){
p->rc = SQLITE_NOMEM;
}
return SQLITE_OK;
}
/*
** Each VDBE holds the result of the most recent sqlite3_step() call
** in p->rc. This routine sets that result back to SQLITE_OK.
*/
void sqlite3VdbeResetStepResult(Vdbe *p){
p->rc = SQLITE_OK;
}
/*
** 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.
**
** To look at it another way, this routine resets the state of the
** virtual machine from VDBE_MAGIC_RUN or VDBE_MAGIC_HALT back to
** VDBE_MAGIC_INIT.
*/
int sqlite3VdbeReset(Vdbe *p){
sqlite3 *db;
db = p->db;
/* If the VM did not run to completion or if it encountered an
** error, then it might not have been halted properly. So halt
** it now.
*/
(void)sqlite3SafetyOn(db);
sqlite3VdbeHalt(p);
(void)sqlite3SafetyOff(db);
/* If the VDBE has be run even partially, then transfer the error code
** and error message from the VDBE into the main database structure. But
** if the VDBE has just been set to run but has not actually executed any
** instructions yet, leave the main database error information unchanged.
*/
if( p->pc>=0 ){
if( p->zErrMsg ){
sqlite3BeginBenignMalloc();
sqlite3ValueSetStr(db->pErr,-1,p->zErrMsg,SQLITE_UTF8,SQLITE_TRANSIENT);
sqlite3EndBenignMalloc();
db->errCode = p->rc;
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
}else if( p->rc ){
sqlite3Error(db, p->rc, 0);
}else{
sqlite3Error(db, SQLITE_OK, 0);
}
}else if( p->rc && p->expired ){
/* The expired flag was set on the VDBE before the first call
** to sqlite3_step(). For consistency (since sqlite3_step() was
** called), set the database error in this case as well.
*/
sqlite3Error(db, p->rc, 0);
sqlite3ValueSetStr(db->pErr, -1, p->zErrMsg, SQLITE_UTF8, SQLITE_TRANSIENT);
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
}
/* Reclaim all memory used by the VDBE
*/
Cleanup(p);
/* Save profiling information from this VDBE run.
*/
#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
);
sqlite3VdbePrintOp(out, i, &p->aOp[i]);
}
fclose(out);
}
}
#endif
p->magic = VDBE_MAGIC_INIT;
return p->rc & db->errMask;
}
/*
** Clean up and delete a VDBE after execution. Return an integer which is
** the result code. Write any error message text into *pzErrMsg.
*/
int sqlite3VdbeFinalize(Vdbe *p){
int rc = SQLITE_OK;
if( p->magic==VDBE_MAGIC_RUN || p->magic==VDBE_MAGIC_HALT ){
rc = sqlite3VdbeReset(p);
assert( (rc & p->db->errMask)==rc );
}else if( p->magic!=VDBE_MAGIC_INIT ){
return SQLITE_MISUSE;
}
sqlite3VdbeDelete(p);
return rc;
}
/*
** Call the destructor for each auxdata entry in pVdbeFunc for which
** the corresponding bit in mask is clear. Auxdata entries beyond 31
** are always destroyed. To destroy all auxdata entries, call this
** routine with mask==0.
*/
void sqlite3VdbeDeleteAuxData(VdbeFunc *pVdbeFunc, int mask){
int i;
for(i=0; i<pVdbeFunc->nAux; i++){
struct AuxData *pAux = &pVdbeFunc->apAux[i];
if( (i>31 || !(mask&(1<<i))) && pAux->pAux ){
if( pAux->xDelete ){
pAux->xDelete(pAux->pAux);
}
pAux->pAux = 0;
}
}
}
/*
** Delete an entire VDBE.
*/
void sqlite3VdbeDelete(Vdbe *p){
int i;
sqlite3 *db;
if( p==0 ) return;
db = p->db;
if( p->pPrev ){
p->pPrev->pNext = p->pNext;
}else{
assert( db->pVdbe==p );
db->pVdbe = p->pNext;
}
if( p->pNext ){
p->pNext->pPrev = p->pPrev;
}
if( p->aOp ){
Op *pOp = p->aOp;
for(i=0; i<p->nOp; i++, pOp++){
freeP4(db, pOp->p4type, pOp->p4.p);
#ifdef SQLITE_DEBUG
sqlite3DbFree(db, pOp->zComment);
#endif
}
sqlite3DbFree(db, p->aOp);
}
releaseMemArray(p->aVar, p->nVar);
sqlite3DbFree(db, p->aLabel);
if( p->aMem ){
sqlite3DbFree(db, &p->aMem[1]);
}
releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
sqlite3DbFree(db, p->aColName);
sqlite3DbFree(db, p->zSql);
p->magic = VDBE_MAGIC_DEAD;
sqlite3DbFree(db, p);
}
/*
** 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 sqlite3VdbeCursorMoveto(VdbeCursor *p){
if( p->deferredMoveto ){
int res, rc;
#ifdef SQLITE_TEST
extern int sqlite3_search_count;
#endif
assert( p->isTable );
rc = sqlite3BtreeMovetoUnpacked(p->pCursor, 0, p->movetoTarget, 0, &res);
if( rc ) return rc;
p->lastRowid = keyToInt(p->movetoTarget);
p->rowidIsValid = res==0 ?1:0;
if( res<0 ){
rc = sqlite3BtreeNext(p->pCursor, &res);
if( rc ) return rc;
}
#ifdef SQLITE_TEST
sqlite3_search_count++;
#endif
p->deferredMoveto = 0;
p->cacheStatus = CACHE_STALE;
}else if( p->pCursor ){
int hasMoved;
int rc = sqlite3BtreeCursorHasMoved(p->pCursor, &hasMoved);
if( rc ) return rc;
if( hasMoved ){
p->cacheStatus = CACHE_STALE;
p->nullRow = 1;
}
}
return SQLITE_OK;
}
/*
** The following functions:
**
** sqlite3VdbeSerialType()
** sqlite3VdbeSerialTypeLen()
** sqlite3VdbeSerialLen()
** sqlite3VdbeSerialPut()
** sqlite3VdbeSerialGet()
**
** encapsulate the code that serializes values for storage in SQLite
** data and index records. Each serialized value consists of a
** 'serial-type' and a blob of data. The serial type is an 8-byte unsigned
** integer, stored as a varint.
**
** In an SQLite index record, the serial type is stored directly before
** the blob of data that it corresponds to. In a table record, all serial
** types are stored at the start of the record, and the blobs of data at
** the end. Hence these functions allow the caller to handle the
** serial-type and data blob seperately.
**
** The following table describes the various storage classes for data:
**
** serial type bytes of data type
** -------------- --------------- ---------------
** 0 0 NULL
** 1 1 signed integer
** 2 2 signed integer
** 3 3 signed integer
** 4 4 signed integer
** 5 6 signed integer
** 6 8 signed integer
** 7 8 IEEE float
** 8 0 Integer constant 0
** 9 0 Integer constant 1
** 10,11 reserved for expansion
** N>=12 and even (N-12)/2 BLOB
** N>=13 and odd (N-13)/2 text
**
** The 8 and 9 types were added in 3.3.0, file format 4. Prior versions
** of SQLite will not understand those serial types.
*/
/*
** Return the serial-type for the value stored in pMem.
*/
u32 sqlite3VdbeSerialType(Mem *pMem, int file_format){
int flags = pMem->flags;
int n;
if( flags&MEM_Null ){
return 0;
}
if( flags&MEM_Int ){
/* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */
# define MAX_6BYTE ((((i64)0x00008000)<<32)-1)
i64 i = pMem->u.i;
u64 u;
if( file_format>=4 && (i&1)==i ){
return 8+(u32)i;
}
u = i<0 ? -i : i;
if( u<=127 ) return 1;
if( u<=32767 ) return 2;
if( u<=8388607 ) return 3;
if( u<=2147483647 ) return 4;
if( u<=MAX_6BYTE ) return 5;
return 6;
}
if( flags&MEM_Real ){
return 7;
}
assert( pMem->db->mallocFailed || flags&(MEM_Str|MEM_Blob) );
n = pMem->n;
if( flags & MEM_Zero ){
n += pMem->u.nZero;
}
assert( n>=0 );
return ((n*2) + 12 + ((flags&MEM_Str)!=0));
}
/*
** Return the length of the data corresponding to the supplied serial-type.
*/
int sqlite3VdbeSerialTypeLen(u32 serial_type){
if( serial_type>=12 ){
return (serial_type-12)/2;
}else{
static const u8 aSize[] = { 0, 1, 2, 3, 4, 6, 8, 8, 0, 0, 0, 0 };
return aSize[serial_type];
}
}
/*
** If we are on an architecture with mixed-endian floating
** points (ex: ARM7) then swap the lower 4 bytes with the
** upper 4 bytes. Return the result.
**
** For most architectures, this is a no-op.
**
** (later): It is reported to me that the mixed-endian problem
** on ARM7 is an issue with GCC, not with the ARM7 chip. It seems
** that early versions of GCC stored the two words of a 64-bit
** float in the wrong order. And that error has been propagated
** ever since. The blame is not necessarily with GCC, though.
** GCC might have just copying the problem from a prior compiler.
** I am also told that newer versions of GCC that follow a different
** ABI get the byte order right.
**
** Developers using SQLite on an ARM7 should compile and run their
** application using -DSQLITE_DEBUG=1 at least once. With DEBUG
** enabled, some asserts below will ensure that the byte order of
** floating point values is correct.
**
** (2007-08-30) Frank van Vugt has studied this problem closely
** and has send his findings to the SQLite developers. Frank
** writes that some Linux kernels offer floating point hardware
** emulation that uses only 32-bit mantissas instead of a full
** 48-bits as required by the IEEE standard. (This is the
** CONFIG_FPE_FASTFPE option.) On such systems, floating point
** byte swapping becomes very complicated. To avoid problems,
** the necessary byte swapping is carried out using a 64-bit integer
** rather than a 64-bit float. Frank assures us that the code here
** works for him. We, the developers, have no way to independently
** verify this, but Frank seems to know what he is talking about
** so we trust him.
*/
#ifdef SQLITE_MIXED_ENDIAN_64BIT_FLOAT
static u64 floatSwap(u64 in){
union {
u64 r;
u32 i[2];
} u;
u32 t;
u.r = in;
t = u.i[0];
u.i[0] = u.i[1];
u.i[1] = t;
return u.r;
}
# define swapMixedEndianFloat(X) X = floatSwap(X)
#else
# define swapMixedEndianFloat(X)
#endif
/*
** Write the serialized data blob for the value stored in pMem into
** buf. It is assumed that the caller has allocated sufficient space.
** Return the number of bytes written.
**
** nBuf is the amount of space left in buf[]. nBuf must always be
** large enough to hold the entire field. Except, if the field is
** a blob with a zero-filled tail, then buf[] might be just the right
** size to hold everything except for the zero-filled tail. If buf[]
** is only big enough to hold the non-zero prefix, then only write that
** prefix into buf[]. But if buf[] is large enough to hold both the
** prefix and the tail then write the prefix and set the tail to all
** zeros.
**
** Return the number of bytes actually written into buf[]. The number
** of bytes in the zero-filled tail is included in the return value only
** if those bytes were zeroed in buf[].
*/
int sqlite3VdbeSerialPut(u8 *buf, int nBuf, Mem *pMem, int file_format){
u32 serial_type = sqlite3VdbeSerialType(pMem, file_format);
int len;
/* Integer and Real */
if( serial_type<=7 && serial_type>0 ){
u64 v;
int i;
if( serial_type==7 ){
assert( sizeof(v)==sizeof(pMem->r) );
memcpy(&v, &pMem->r, sizeof(v));
swapMixedEndianFloat(v);
}else{
v = pMem->u.i;
}
len = i = sqlite3VdbeSerialTypeLen(serial_type);
assert( len<=nBuf );
while( i-- ){
buf[i] = (u8)(v&0xFF);
v >>= 8;
}
return len;
}
/* String or blob */
if( serial_type>=12 ){
assert( pMem->n + ((pMem->flags & MEM_Zero)?pMem->u.nZero:0)
== sqlite3VdbeSerialTypeLen(serial_type) );
assert( pMem->n<=nBuf );
len = pMem->n;
memcpy(buf, pMem->z, len);
if( pMem->flags & MEM_Zero ){
len += pMem->u.nZero;
if( len>nBuf ){
len = nBuf;
}
memset(&buf[pMem->n], 0, len-pMem->n);
}
return len;
}
/* NULL or constants 0 or 1 */
return 0;
}
/*
** Deserialize the data blob pointed to by buf as serial type serial_type
** and store the result in pMem. Return the number of bytes read.
*/
int sqlite3VdbeSerialGet(
const unsigned char *buf, /* Buffer to deserialize from */
u32 serial_type, /* Serial type to deserialize */
Mem *pMem /* Memory cell to write value into */
){
switch( serial_type ){
case 10: /* Reserved for future use */
case 11: /* Reserved for future use */
case 0: { /* NULL */
pMem->flags = MEM_Null;
break;
}
case 1: { /* 1-byte signed integer */
pMem->u.i = (signed char)buf[0];
pMem->flags = MEM_Int;
return 1;
}
case 2: { /* 2-byte signed integer */
pMem->u.i = (((signed char)buf[0])<<8) | buf[1];
pMem->flags = MEM_Int;
return 2;
}
case 3: { /* 3-byte signed integer */
pMem->u.i = (((signed char)buf[0])<<16) | (buf[1]<<8) | buf[2];
pMem->flags = MEM_Int;
return 3;
}
case 4: { /* 4-byte signed integer */
pMem->u.i = (buf[0]<<24) | (buf[1]<<16) | (buf[2]<<8) | buf[3];
pMem->flags = MEM_Int;
return 4;
}
case 5: { /* 6-byte signed integer */
u64 x = (((signed char)buf[0])<<8) | buf[1];
u32 y = (buf[2]<<24) | (buf[3]<<16) | (buf[4]<<8) | buf[5];
x = (x<<32) | y;
pMem->u.i = *(i64*)&x;
pMem->flags = MEM_Int;
return 6;
}
case 6: /* 8-byte signed integer */
case 7: { /* IEEE floating point */
u64 x;
u32 y;
#if !defined(NDEBUG) && !defined(SQLITE_OMIT_FLOATING_POINT)
/* Verify that integers and floating point values use the same
** byte order. Or, that if SQLITE_MIXED_ENDIAN_64BIT_FLOAT is
** defined that 64-bit floating point values really are mixed
** endian.
*/
static const u64 t1 = ((u64)0x3ff00000)<<32;
static const double r1 = 1.0;
u64 t2 = t1;
swapMixedEndianFloat(t2);
assert( sizeof(r1)==sizeof(t2) && memcmp(&r1, &t2, sizeof(r1))==0 );
#endif
x = (buf[0]<<24) | (buf[1]<<16) | (buf[2]<<8) | buf[3];
y = (buf[4]<<24) | (buf[5]<<16) | (buf[6]<<8) | buf[7];
x = (x<<32) | y;
if( serial_type==6 ){
pMem->u.i = *(i64*)&x;
pMem->flags = MEM_Int;
}else{
assert( sizeof(x)==8 && sizeof(pMem->r)==8 );
swapMixedEndianFloat(x);
memcpy(&pMem->r, &x, sizeof(x));
pMem->flags = sqlite3IsNaN(pMem->r) ? MEM_Null : MEM_Real;
}
return 8;
}
case 8: /* Integer 0 */
case 9: { /* Integer 1 */
pMem->u.i = serial_type-8;
pMem->flags = MEM_Int;
return 0;
}
default: {
int len = (serial_type-12)/2;
pMem->z = (char *)buf;
pMem->n = len;
pMem->xDel = 0;
if( serial_type&0x01 ){
pMem->flags = MEM_Str | MEM_Ephem;
}else{
pMem->flags = MEM_Blob | MEM_Ephem;
}
return len;
}
}
return 0;
}
/*
** Given the nKey-byte encoding of a record in pKey[], parse the
** record into a UnpackedRecord structure. Return a pointer to
** that structure.
**
** The calling function might provide szSpace bytes of memory
** space at pSpace. This space can be used to hold the returned
** VDbeParsedRecord structure if it is large enough. If it is
** not big enough, space is obtained from sqlite3_malloc().
**
** The returned structure should be closed by a call to
** sqlite3VdbeDeleteUnpackedRecord().
*/
UnpackedRecord *sqlite3VdbeRecordUnpack(
KeyInfo *pKeyInfo, /* Information about the record format */
int nKey, /* Size of the binary record */
const void *pKey, /* The binary record */
UnpackedRecord *pSpace,/* Space available to hold resulting object */
int szSpace /* Size of pSpace[] in bytes */
){
const unsigned char *aKey = (const unsigned char *)pKey;
UnpackedRecord *p;
int nByte, d;
u32 idx;
u16 u; /* Unsigned loop counter */
u32 szHdr;
Mem *pMem;
assert( sizeof(Mem)>sizeof(*p) );
nByte = sizeof(Mem)*(pKeyInfo->nField+2);
if( nByte>szSpace ){
p = sqlite3DbMallocRaw(pKeyInfo->db, nByte);
if( p==0 ) return 0;
p->flags = UNPACKED_NEED_FREE | UNPACKED_NEED_DESTROY;
}else{
p = pSpace;
p->flags = UNPACKED_NEED_DESTROY;
}
p->pKeyInfo = pKeyInfo;
p->nField = pKeyInfo->nField + 1;
p->aMem = pMem = &((Mem*)p)[1];
idx = getVarint32(aKey, szHdr);
d = szHdr;
u = 0;
while( idx<szHdr && u<p->nField ){
u32 serial_type;
idx += getVarint32(&aKey[idx], serial_type);
if( d>=nKey && sqlite3VdbeSerialTypeLen(serial_type)>0 ) break;
pMem->enc = pKeyInfo->enc;
pMem->db = pKeyInfo->db;
pMem->flags = 0;
pMem->zMalloc = 0;
d += sqlite3VdbeSerialGet(&aKey[d], serial_type, pMem);
pMem++;
u++;
}
assert( u<=pKeyInfo->nField + 1 );
p->nField = u;
return (void*)p;
}
/*
** This routine destroys a UnpackedRecord object
*/
void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord *p){
if( p ){
if( p->flags & UNPACKED_NEED_DESTROY ){
int i;
Mem *pMem;
for(i=0, pMem=p->aMem; i<p->nField; i++, pMem++){
if( pMem->zMalloc ){
sqlite3VdbeMemRelease(pMem);
}
}
}
if( p->flags & UNPACKED_NEED_FREE ){
sqlite3DbFree(p->pKeyInfo->db, p);
}
}
}
/*
** This function compares the two table rows or index records
** specified by {nKey1, pKey1} and pPKey2. It returns a negative, zero
** or positive integer if key1 is less than, equal to or
** greater than key2. The {nKey1, pKey1} key must be a blob
** created by th OP_MakeRecord opcode of the VDBE. The pPKey2
** key must be a parsed key such as obtained from
** sqlite3VdbeParseRecord.
**
** Key1 and Key2 do not have to contain the same number of fields.
** The key with fewer fields is usually compares less than the
** longer key. However if the UNPACKED_INCRKEY flags in pPKey2 is set
** and the common prefixes are equal, then key1 is less than key2.
** Or if the UNPACKED_MATCH_PREFIX flag is set and the prefixes are
** equal, then the keys are considered to be equal and
** the parts beyond the common prefix are ignored.
**
** If the UNPACKED_IGNORE_ROWID flag is set, then the last byte of
** the header of pKey1 is ignored. It is assumed that pKey1 is
** an index key, and thus ends with a rowid value. The last byte
** of the header will therefore be the serial type of the rowid:
** one of 1, 2, 3, 4, 5, 6, 8, or 9 - the integer serial types.
** The serial type of the final rowid will always be a single byte.
** By ignoring this last byte of the header, we force the comparison
** to ignore the rowid at the end of key1.
*/
int sqlite3VdbeRecordCompare(
int nKey1, const void *pKey1, /* Left key */
UnpackedRecord *pPKey2 /* Right key */
){
int d1; /* Offset into aKey[] of next data element */
u32 idx1; /* Offset into aKey[] of next header element */
u32 szHdr1; /* Number of bytes in header */
int i = 0;
int nField;
int rc = 0;
const unsigned char *aKey1 = (const unsigned char *)pKey1;
KeyInfo *pKeyInfo;
Mem mem1;
pKeyInfo = pPKey2->pKeyInfo;
mem1.enc = pKeyInfo->enc;
mem1.db = pKeyInfo->db;
mem1.flags = 0;
mem1.zMalloc = 0;
idx1 = getVarint32(aKey1, szHdr1);
d1 = szHdr1;
if( pPKey2->flags & UNPACKED_IGNORE_ROWID ){
szHdr1--;
}
nField = pKeyInfo->nField;
while( idx1<szHdr1 && i<pPKey2->nField ){
u32 serial_type1;
/* Read the serial types for the next element in each key. */
idx1 += getVarint32( aKey1+idx1, serial_type1 );
if( d1>=nKey1 && sqlite3VdbeSerialTypeLen(serial_type1)>0 ) break;
/* Extract the values to be compared.
*/
d1 += sqlite3VdbeSerialGet(&aKey1[d1], serial_type1, &mem1);
/* Do the comparison
*/
rc = sqlite3MemCompare(&mem1, &pPKey2->aMem[i],
i<nField ? pKeyInfo->aColl[i] : 0);
if( rc!=0 ){
break;
}
i++;
}
if( mem1.zMalloc ) sqlite3VdbeMemRelease(&mem1);
if( rc==0 ){
/* rc==0 here means that one of the keys ran out of fields and
** all the fields up to that point were equal. If the UNPACKED_INCRKEY
** flag is set, then break the tie by treating key2 as larger.
** If the UPACKED_PREFIX_MATCH flag is set, then keys with common prefixes
** are considered to be equal. Otherwise, the longer key is the
** larger. As it happens, the pPKey2 will always be the longer
** if there is a difference.
*/
if( pPKey2->flags & UNPACKED_INCRKEY ){
rc = -1;
}else if( pPKey2->flags & UNPACKED_PREFIX_MATCH ){
/* Leave rc==0 */
}else if( idx1<szHdr1 ){
rc = 1;
}
}else if( pKeyInfo->aSortOrder && i<pKeyInfo->nField
&& pKeyInfo->aSortOrder[i] ){
rc = -rc;
}
return rc;
}
/*
** pCur points at an index entry created using the OP_MakeRecord opcode.
** Read the rowid (the last field in the record) and store it in *rowid.
** Return SQLITE_OK if everything works, or an error code otherwise.
**
** pCur might be pointing to text obtained from a corrupt database file.
** So the content cannot be trusted. Do appropriate checks on the content.
*/
int sqlite3VdbeIdxRowid(BtCursor *pCur, i64 *rowid){
i64 nCellKey = 0;
int rc;
u32 szHdr; /* Size of the header */
u32 typeRowid; /* Serial type of the rowid */
u32 lenRowid; /* Size of the rowid */
Mem m, v;
/* Get the size of the index entry. Only indices entries of less
** than 2GiB are support - anything large must be database corruption */
sqlite3BtreeKeySize(pCur, &nCellKey);
if( unlikely(nCellKey<=0 || nCellKey>0x7fffffff) ){
return SQLITE_CORRUPT_BKPT;
}
/* Read in the complete content of the index entry */
m.flags = 0;
m.db = 0;
m.zMalloc = 0;
rc = sqlite3VdbeMemFromBtree(pCur, 0, (int)nCellKey, 1, &m);
if( rc ){
return rc;
}
/* The index entry must begin with a header size */
(void)getVarint32((u8*)m.z, szHdr);
testcase( szHdr==2 );
testcase( szHdr==m.n );
if( unlikely(szHdr<2 || (int)szHdr>m.n) ){
goto idx_rowid_corruption;
}
/* The last field of the index should be an integer - the ROWID.
** Verify that the last entry really is an integer. */
(void)getVarint32((u8*)&m.z[szHdr-1], typeRowid);
testcase( typeRowid==1 );
testcase( typeRowid==2 );
testcase( typeRowid==3 );
testcase( typeRowid==4 );
testcase( typeRowid==5 );
testcase( typeRowid==6 );
testcase( typeRowid==8 );
testcase( typeRowid==9 );
if( unlikely(typeRowid<1 || typeRowid>9 || typeRowid==7) ){
goto idx_rowid_corruption;
}
lenRowid = sqlite3VdbeSerialTypeLen(typeRowid);
testcase( m.n-lenRowid==szHdr );
if( unlikely(m.n-lenRowid<szHdr) ){
goto idx_rowid_corruption;
}
/* Fetch the integer off the end of the index record */
sqlite3VdbeSerialGet((u8*)&m.z[m.n-lenRowid], typeRowid, &v);
*rowid = v.u.i;
sqlite3VdbeMemRelease(&m);
return SQLITE_OK;
/* Jump here if database corruption is detected after m has been
** allocated. Free the m object and return SQLITE_CORRUPT. */
idx_rowid_corruption:
testcase( m.zMalloc!=0 );
sqlite3VdbeMemRelease(&m);
return SQLITE_CORRUPT_BKPT;
}
/*
** Compare the key of the index entry that cursor pC is point to against
** the key string in pKey (of length nKey). Write into *pRes a number
** that is negative, zero, or positive if pC is less than, equal to,
** or greater than pKey. Return SQLITE_OK on success.
**
** pKey is either created without a rowid or is truncated so that it
** omits the rowid at the end. The rowid at the end of the index entry
** is ignored as well. Hence, this routine only compares the prefixes
** of the keys prior to the final rowid, not the entire key.
**
** pUnpacked may be an unpacked version of pKey,nKey. If pUnpacked is
** supplied it is used in place of pKey,nKey.
*/
int sqlite3VdbeIdxKeyCompare(
VdbeCursor *pC, /* The cursor to compare against */
UnpackedRecord *pUnpacked, /* Unpacked version of pKey and nKey */
int *res /* Write the comparison result here */
){
i64 nCellKey = 0;
int rc;
BtCursor *pCur = pC->pCursor;
Mem m;
sqlite3BtreeKeySize(pCur, &nCellKey);
if( nCellKey<=0 || nCellKey>0x7fffffff ){
*res = 0;
return SQLITE_OK;
}
m.db = 0;
m.flags = 0;
m.zMalloc = 0;
rc = sqlite3VdbeMemFromBtree(pC->pCursor, 0, (int)nCellKey, 1, &m);
if( rc ){
return rc;
}
assert( pUnpacked->flags & UNPACKED_IGNORE_ROWID );
*res = sqlite3VdbeRecordCompare(m.n, m.z, pUnpacked);
sqlite3VdbeMemRelease(&m);
return SQLITE_OK;
}
/*
** This routine sets the value to be returned by subsequent calls to
** sqlite3_changes() on the database handle 'db'.
*/
void sqlite3VdbeSetChanges(sqlite3 *db, int nChange){
assert( sqlite3_mutex_held(db->mutex) );
db->nChange = nChange;
db->nTotalChange += nChange;
}
/*
** Set a flag in the vdbe to update the change counter when it is finalised
** or reset.
*/
void sqlite3VdbeCountChanges(Vdbe *v){
v->changeCntOn = 1;
}
/*
** Mark every prepared statement associated with a database connection
** as expired.
**
** An expired statement means that recompilation of the statement is
** recommend. Statements expire when things happen that make their
** programs obsolete. Removing user-defined functions or collating
** sequences, or changing an authorization function are the types of
** things that make prepared statements obsolete.
*/
void sqlite3ExpirePreparedStatements(sqlite3 *db){
Vdbe *p;
for(p = db->pVdbe; p; p=p->pNext){
p->expired = 1;
}
}
/*
** Return the database associated with the Vdbe.
*/
sqlite3 *sqlite3VdbeDb(Vdbe *v){
return v->db;
}
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