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6173a9a109
The aim of this PR is twofold:
- Reduce the number of highly similar TMP|VAR handlers
- Avoid ZVAL_DEREF in most of these cases
This is achieved by guaranteeing that all zend_compile_expr() calls, as well as
all other compile calls with BP_VAR_{R,IS}, will result in a TMP variable. This
implies that the result will not contain an IS_INDIRECT or IS_REFERENCE value,
which was mostly already the case, with two exceptions:
- Calls to return-by-reference functions. Because return-by-reference functions
are quite rare, this is solved by delegating the DEREF to the RETURN_BY_REF
handler, which will examine the stack to check whether the caller expects a
VAR or TMP to understand whether the DEREF is needed. Internal functions will
also need to adjust by calling the zend_return_unwrap_ref() function.
- By-reference assignments, including both $a = &$b, as well as $a = [&$b]. When
the result of these expressions is used in a BP_VAR_R context, the reference
is unwrapped via a ZEND_QM_ASSIGN opcode beforehand. This is exceptionally
rare.
Closes GH-20628
74 lines
1.2 KiB
PHP
74 lines
1.2 KiB
PHP
--TEST--
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array_map(): foreach optimization - const array
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--EXTENSIONS--
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opcache
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--INI--
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opcache.enable=1
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opcache.enable_cli=1
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opcache.opt_debug_level=0x20000
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--FILE--
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<?php
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function plus1($x) {
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return $x + 1;
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}
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$foo = array_map(plus1(...), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
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var_dump($foo);
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?>
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--EXPECTF--
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$_main:
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; (lines=%d, args=0, vars=%d, tmps=%d)
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; (after optimizer)
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; %s
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0000 TYPE_ASSERT 131079 string("array_map") array(...)
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0001 T1 = INIT_ARRAY 0 (packed) NEXT
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0002 V2 = FE_RESET_R array(...) 0009
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0003 T4 = FE_FETCH_R V2 T3 0009
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0004 INIT_FCALL 1 %d string("plus1")
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0005 SEND_VAL T3 1
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0006 T3 = DO_UCALL
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0007 T1 = ADD_ARRAY_ELEMENT T3 T4
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0008 JMP 0003
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0009 FE_FREE V2
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0010 ASSIGN CV0($foo) T1
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0011 INIT_FCALL 1 %d string("var_dump")
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0012 SEND_VAR CV0($foo) 1
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0013 DO_ICALL
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0014 RETURN int(1)
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LIVE RANGES:
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1: 0002 - 0010 (tmp/var)
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2: 0003 - 0009 (loop)
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plus1:
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; (lines=3, args=1, vars=1, tmps=%d)
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; (after optimizer)
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; %s
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0000 CV0($x) = RECV 1
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0001 T1 = ADD CV0($x) int(1)
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0002 RETURN T1
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array(10) {
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[0]=>
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int(2)
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[1]=>
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int(3)
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[2]=>
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int(4)
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[3]=>
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int(5)
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[4]=>
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int(6)
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[5]=>
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int(7)
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[6]=>
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int(8)
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[7]=>
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int(9)
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[8]=>
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int(10)
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[9]=>
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int(11)
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}
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