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Fix ZEND_MATCH_ERROR misoptimization

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op1 of ZEND_MATCH_ERROR, which refers to the match expression, is not freed by
MATCH_ERROR itself. Instead, it is freed by ZEND_HANDLE_EXCEPTION. For normal
control flow, a FREE is placed at the end of the match expression.

Since FREE may appear after MATCH_ERROR in the opcode sequence, we need to
correctly handle op1 of MATCH_ERROR as alive.

Fixes GH-17106
Closes GH-17108
This commit is contained in:
Ilija Tovilo
2024-12-10 13:43:29 +01:00
parent 754aa7706b
commit cdfd960150
4 changed files with 27 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
NEWS
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@@ -2,6 +2,9 @@ PHP NEWS
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
?? ??? ????, PHP 8.3.16
- Core:
. Fixed bug GH-17106 (ZEND_MATCH_ERROR misoptimization). (ilutov)
- DBA:
. Skip test if inifile is disabled. (orlitzky)

2
Zend/Optimizer/zend_optimizer.c
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@@ -640,6 +640,7 @@ bool zend_optimizer_replace_by_const(zend_op_array *op_array,
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
case ZEND_MATCH_ERROR:
case ZEND_JMP_NULL: {
zend_op *end = op_array->opcodes + op_array->last;
while (opline < end) {
@@ -652,6 +653,7 @@ bool zend_optimizer_replace_by_const(zend_op_array *op_array,
&& opline->opcode != ZEND_SWITCH_LONG
&& opline->opcode != ZEND_SWITCH_STRING
&& opline->opcode != ZEND_MATCH
&& opline->opcode != ZEND_MATCH_ERROR
&& opline->opcode != ZEND_JMP_NULL
&& (opline->opcode != ZEND_FREE
|| opline->extended_value != ZEND_FREE_ON_RETURN);

1
Zend/zend_opcode.c
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@@ -877,6 +877,7 @@ static bool keeps_op1_alive(zend_op *opline) {
|| opline->opcode == ZEND_SWITCH_LONG
|| opline->opcode == ZEND_SWITCH_STRING
|| opline->opcode == ZEND_MATCH
|| opline->opcode == ZEND_MATCH_ERROR
|| opline->opcode == ZEND_FETCH_LIST_R
|| opline->opcode == ZEND_FETCH_LIST_W
|| opline->opcode == ZEND_COPY_TMP) {

21
ext/opcache/tests/gh17106.phpt Normal file
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@@ -0,0 +1,21 @@
--TEST--
GH-17106: ZEND_MATCH_ERROR misoptimization
--EXTENSIONS--
opcache
--INI--
opcache.enable_cli=1
opcache.optimization_level=-1
--FILE--
<?php
const X = 2;
var_dump(7 ?? match (X) {});
var_dump(null ?? match (X) { 2 => 2 });
var_dump(match (X) { 2 => 2 });
?>
--EXPECT--
int(7)
int(2)
int(2)