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Overview
| Comment: | Save CPU cycles in sqlite3Prepare() by, among other things, shifting the EXPLAIN column label logic over to sqlite3VdbeMakeReady(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
1ca5ef84506aac3e2f08baa36095b3be |
| User & Date: | drh 2019-10-09 01:19:07 |
Context
|
2019-10-09
| ||
| 15:00 | Change sqlite3SelectDup() to always return NULL if an OOM has occurred. check-in: 01ba4641 user: drh tags: trunk | |
| 13:12 | Remove the obsolete "fastfuzztest" target from the makefiles. check-in: 3d44f1ee user: drh tags: makefile-cleanup | |
| 01:19 | Save CPU cycles in sqlite3Prepare() by, among other things, shifting the EXPLAIN column label logic over to sqlite3VdbeMakeReady(). check-in: 1ca5ef84 user: drh tags: trunk | |
|
2019-10-08
| ||
| 13:34 | Fix problems with using the fts5 'rebuild' command inside a transaction that contains other updates of the same table. Fix for [e258f008]. check-in: 238e0835 user: dan tags: trunk | |
Changes
Changes to src/prepare.c.
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sParse.zTail = &zSql[nBytes];
}
}else{
sqlite3RunParser(&sParse, zSql, &zErrMsg);
}
assert( 0==sParse.nQueryLoop );
if( sParse.rc==SQLITE_DONE ) sParse.rc = SQLITE_OK;
if( sParse.checkSchema ){
schemaIsValid(&sParse);
}
if( db->mallocFailed ){
sParse.rc = SQLITE_NOMEM_BKPT;
}
if( pzTail ){
*pzTail = sParse.zTail;
}
rc = sParse.rc;
#ifndef SQLITE_OMIT_EXPLAIN
/* Justification for the ALWAYS(): The only way for rc to be SQLITE_OK and
** sParse.pVdbe to be NULL is if the input SQL is an empty string, but in
** that case, sParse.explain will be false. */
if( sParse.explain && rc==SQLITE_OK && ALWAYS(sParse.pVdbe) ){
static const char * const azColName[] = {
"addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
"id", "parent", "notused", "detail"
};
int iFirst, mx;
if( sParse.explain==2 ){
sqlite3VdbeSetNumCols(sParse.pVdbe, 4);
iFirst = 8;
mx = 12;
}else{
sqlite3VdbeSetNumCols(sParse.pVdbe, 8);
iFirst = 0;
mx = 8;
}
for(i=iFirst; i<mx; i++){
sqlite3VdbeSetColName(sParse.pVdbe, i-iFirst, COLNAME_NAME,
azColName[i], SQLITE_STATIC);
}
}
#endif
if( db->init.busy==0 ){
sqlite3VdbeSetSql(sParse.pVdbe, zSql, (int)(sParse.zTail-zSql), prepFlags);
}
if( rc!=SQLITE_OK || db->mallocFailed ){
if( sParse.pVdbe ) sqlite3VdbeFinalize(sParse.pVdbe);
assert(!(*ppStmt));
}else{
*ppStmt = (sqlite3_stmt*)sParse.pVdbe;
}
if( zErrMsg ){
|
| > > < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | > > > > |
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sParse.zTail = &zSql[nBytes];
}
}else{
sqlite3RunParser(&sParse, zSql, &zErrMsg);
}
assert( 0==sParse.nQueryLoop );
if( sParse.rc==SQLITE_DONE ){
sParse.rc = SQLITE_OK;
}
if( sParse.checkSchema ){
schemaIsValid(&sParse);
}
if( pzTail ){
*pzTail = sParse.zTail;
}
if( db->init.busy==0 ){
sqlite3VdbeSetSql(sParse.pVdbe, zSql, (int)(sParse.zTail-zSql), prepFlags);
}
if( db->mallocFailed ){
sParse.rc = SQLITE_NOMEM_BKPT;
}
rc = sParse.rc;
if( rc!=SQLITE_OK ){
if( sParse.pVdbe ) sqlite3VdbeFinalize(sParse.pVdbe);
assert(!(*ppStmt));
}else{
*ppStmt = (sqlite3_stmt*)sParse.pVdbe;
}
if( zErrMsg ){
|
Changes to src/vdbeaux.c.
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assert( EIGHT_BYTE_ALIGNMENT(x.pSpace) );
x.nFree = ROUNDDOWN8(pParse->szOpAlloc - n); /* Bytes of unused memory */
assert( x.nFree>=0 );
assert( EIGHT_BYTE_ALIGNMENT(&x.pSpace[x.nFree]) );
resolveP2Values(p, &nArg);
p->usesStmtJournal = (u8)(pParse->isMultiWrite && pParse->mayAbort);
if( pParse->explain && nMem<10 ){
nMem = 10;
}
p->expired = 0;
/* Memory for registers, parameters, cursor, etc, is allocated in one or two
** passes. On the first pass, we try to reuse unused memory at the
** end of the opcode array. If we are unable to satisfy all memory
** requirements by reusing the opcode array tail, then the second
|
| > > > > > | > > > > > > > > > > > > > |
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assert( EIGHT_BYTE_ALIGNMENT(x.pSpace) );
x.nFree = ROUNDDOWN8(pParse->szOpAlloc - n); /* Bytes of unused memory */
assert( x.nFree>=0 );
assert( EIGHT_BYTE_ALIGNMENT(&x.pSpace[x.nFree]) );
resolveP2Values(p, &nArg);
p->usesStmtJournal = (u8)(pParse->isMultiWrite && pParse->mayAbort);
if( pParse->explain ){
static const char * const azColName[] = {
"addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
"id", "parent", "notused", "detail"
};
int iFirst, mx, i;
if( nMem<10 ) nMem = 10;
if( pParse->explain==2 ){
sqlite3VdbeSetNumCols(p, 4);
iFirst = 8;
mx = 12;
}else{
sqlite3VdbeSetNumCols(p, 8);
iFirst = 0;
mx = 8;
}
for(i=iFirst; i<mx; i++){
sqlite3VdbeSetColName(p, i-iFirst, COLNAME_NAME,
azColName[i], SQLITE_STATIC);
}
}
p->expired = 0;
/* Memory for registers, parameters, cursor, etc, is allocated in one or two
** passes. On the first pass, we try to reuse unused memory at the
** end of the opcode array. If we are unable to satisfy all memory
** requirements by reusing the opcode array tail, then the second
|