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Change the OP_Trace opcode to OP_Init and give it the ability to jump to the

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initialization code at the bottom of the program, thus avoiding the need for
an extra OP_Goto.

FossilOrigin-Name: 192dea97316144f15f6dd0eabff08a0bf9ef203e
This commit is contained in:
drh
2014-02-08 01:40:27 +00:00
parent 642364a48b
commit aceb31b120
10 changed files with 61 additions and 117 deletions
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18
src/vdbe.c
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@@ -6144,16 +6144,26 @@ case OP_MaxPgcnt: { /* out2-prerelease */
#endif
#ifndef SQLITE_OMIT_TRACE
/* Opcode: Trace * * * P4 *
/* Opcode: Init * P2 * P4 *
** Synopsis: Start at P2
**
** Programs contain a single instance of this opcode as the very first
** opcode.
**
** If tracing is enabled (by the sqlite3_trace()) interface, then
** the UTF-8 string contained in P4 is emitted on the trace callback.
** Or if P4 is blank, use the string returned by sqlite3_sql().
**
** If P2 is not zero, jump to instruction P2.
*/
case OP_Trace: {
case OP_Init: { /* jump */
char *zTrace;
char *z;
if( pOp->p2 ){
pc = pOp->p2 - 1;
}
#ifndef SQLITE_OMIT_TRACE
if( db->xTrace
&& !p->doingRerun
&& (zTrace = (pOp->p4.z ? pOp->p4.z : p->zSql))!=0
@@ -6179,9 +6189,9 @@ case OP_Trace: {
sqlite3DebugPrintf("SQL-trace: %s\n", zTrace);
}
#endif /* SQLITE_DEBUG */
#endif /* SQLITE_OMIT_TRACE */
break;
}
#endif
/* Opcode: Noop * * * * *