Fix GH-21691: OPcache CFG optimizer eliminates QM_ASSIGN feeding JMPZ with VAR operand#27
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Fix GH-21691: OPcache CFG optimizer eliminates QM_ASSIGN feeding JMPZ with VAR operand#27
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…MPZ with VAR operand The CFG optimizer (pass 5) removed a QM_ASSIGN that converted IS_VAR to IS_TMP_VAR before JMPZ. JMPZ has no handler for IS_VAR operands, producing "Invalid opcode 43/4/0." This occurred when ASSIGN_REF (which produces IS_VAR) fed into a conditional via QM_ASSIGN. Skip the QM_ASSIGN elimination when the source operand is IS_VAR. Closes phpGH-21691
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Submitted upstream as php#21696 |
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Fixes php#21691
The CFG optimizer (pass 5) removed a
QM_ASSIGNthat convertedIS_VARtoIS_TMP_VARbeforeJMPZ. SinceJMPZhas no handler forIS_VARoperands, this produced "Invalid opcode 43/4/0." The pattern occurs whenASSIGN_REF(which producesIS_VAR) feeds into a conditional viaQM_ASSIGN.Skips the
QM_ASSIGNelimination when the source operand isIS_VAR.Note: the reporter's analysis pointed at
DO_UCALLandzend_get_call_op, but the actual crash is inblock_pass.cwhere the CFG optimizer strips the type-convertingQM_ASSIGN.