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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
58 lines
1.2 KiB
PHP
58 lines
1.2 KiB
PHP
--TEST--
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array_map(): foreach optimization - unused refcounted result
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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 stdClass() {
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return new stdClass();
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}
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$array = range(1, 10);
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array_map(stdClass(...), $array);
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?>
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--EXPECTF--
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$_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 INIT_FCALL 2 %d string("range")
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0001 SEND_VAL int(1) 1
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0002 SEND_VAL int(10) 2
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0003 T1 = DO_ICALL
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0004 ASSIGN CV0($array) T1
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0005 TYPE_ASSERT 131079 string("array_map") CV0($array)
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0006 T1 = INIT_ARRAY 0 (packed) NEXT
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0007 V2 = FE_RESET_R CV0($array) 0014
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0008 T4 = FE_FETCH_R V2 T3 0014
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0009 INIT_FCALL 1 %d string("stdclass")
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0010 SEND_VAL T3 1
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0011 T3 = DO_UCALL
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0012 T1 = ADD_ARRAY_ELEMENT T3 T4
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0013 JMP 0008
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0014 FE_FREE V2
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0015 FREE T1
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0016 RETURN int(1)
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LIVE RANGES:
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1: 0007 - 0015 (tmp/var)
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2: 0008 - 0014 (loop)
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3: 0009 - 0010 (tmp/var)
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4: 0009 - 0012 (tmp/var)
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stdClass:
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; (lines=3, args=0, vars=0, tmps=%d)
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; (after optimizer)
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; %s
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0000 T0 = NEW 0 string("stdClass")
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0001 DO_FCALL
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0002 RETURN T0
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LIVE RANGES:
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0: 0001 - 0002 (new)
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