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Get rid of the OP_Undef and OP_IsUndef opcodes in favor of higher-level

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OP_InitCoroutine and OP_EndCoroutine.

FossilOrigin-Name: 1ec0e9dd4b26d9f597adc8e062317d4866c5a6a6
This commit is contained in:
drh
2014-02-07 18:27:53 +00:00
parent a5750cfe01
commit 81cf13ec7b
6 changed files with 97 additions and 123 deletions
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5
src/where.c
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@@ -2785,10 +2785,9 @@ static Bitmask codeOneLoopStart(
/* Special case of a FROM clause subquery implemented as a co-routine */
if( pTabItem->viaCoroutine ){
int regYield = pTabItem->regReturn;
sqlite3VdbeAddOp2(v, OP_Integer, pTabItem->addrFillSub-1, regYield);
pLevel->p2 = sqlite3VdbeAddOp1(v, OP_Yield, regYield);
sqlite3VdbeAddOp2(v, OP_InitCoroutine, regYield, pTabItem->addrFillSub);
pLevel->p2 = sqlite3VdbeAddOp2(v, OP_Yield, regYield, addrBrk);
VdbeComment((v, "next row of co-routine %s", pTabItem->pTab->zName));
sqlite3VdbeAddOp2(v, OP_If, regYield+1, addrBrk);
pLevel->op = OP_Goto;
}else