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Fix incorrect match default branch optimization

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Fixes GH-11134
Closes GH-11135
This commit is contained in:
Ilija Tovilo 2023-04-26 11:55:23 +02:00
parent 725f136f9a
commit 3a76f795f8
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GPG key ID: A4F5D403F118200A
3 changed files with 49 additions and 10 deletions
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2
NEWS
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@ -2,6 +2,8 @@ PHP NEWS
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
?? ??? ????, PHP 8.1.20
- Opcache:
. Fixed bug GH-11134 (Incorrect match default branch optimization). (ilutov)
11 May 2023, PHP 8.1.19

29
Zend/Optimizer/dfa_pass.c
View file

@ -1000,32 +1000,41 @@ optimize_jmpnz:
|| (opline->opcode == ZEND_SWITCH_STRING && type == IS_STRING)
|| (opline->opcode == ZEND_MATCH && (type == IS_LONG || type == IS_STRING));
if (!correct_type) {
/* Switch statements have a fallback chain for loose comparison. In those
* cases the SWITCH_* instruction is a NOP. Match does strict comparison and
* thus jumps to the default branch on mismatched types, so we need to
* convert MATCH to a jmp. */
if (!correct_type && opline->opcode != ZEND_MATCH) {
removed_ops++;
MAKE_NOP(opline);
opline->extended_value = 0;
take_successor_ex(ssa, block_num, block, block->successors[block->successors_count - 1]);
goto optimize_nop;
} else {
}
uint32_t target;
if (correct_type) {
HashTable *jmptable = Z_ARRVAL_P(CT_CONSTANT_EX(op_array, opline->op2.constant));
zval *jmp_zv = type == IS_LONG
? zend_hash_index_find(jmptable, Z_LVAL_P(zv))
: zend_hash_find(jmptable, Z_STR_P(zv));
uint32_t target;
if (jmp_zv) {
target = ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(jmp_zv));
} else {
target = ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value);
}
opline->opcode = ZEND_JMP;
opline->extended_value = 0;
SET_UNUSED(opline->op1);
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, op_array->opcodes + target);
SET_UNUSED(opline->op2);
take_successor_ex(ssa, block_num, block, ssa->cfg.map[target]);
goto optimize_jmp;
} else {
ZEND_ASSERT(opline->opcode == ZEND_MATCH);
target = ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value);
}
opline->opcode = ZEND_JMP;
opline->extended_value = 0;
SET_UNUSED(opline->op1);
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, op_array->opcodes + target);
SET_UNUSED(opline->op2);
take_successor_ex(ssa, block_num, block, ssa->cfg.map[target]);
goto optimize_jmp;
}
break;
case ZEND_NOP:

28
Zend/tests/match/gh11134.phpt Normal file
View file

@ -0,0 +1,28 @@
--TEST--
GH-11134: Incorrect match optimization
--FILE--
<?php
function testMatch() {
return match ($unset ?? null) {
'foo' => 'foo',
'bar' => 'bar',
default => 'baz',
};
}
function testSwitch() {
switch ($unset ?? null) {
case 'foo': return 'foo';
case 'bar': return 'bar';
default: return 'baz';
}
}
var_dump(testMatch());
var_dump(testSwitch());
?>
--EXPECT--
string(3) "baz"
string(3) "baz"