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a5944f8dd5
For live-variable analysis it does not matter if def includes variables that are previously use in the same block, the data flow equations still have the same result. As such there is no need to compute separate gen & def sets. I'm keeping the name "def", because use of "gen" in this context is pretty confusing (gen is usually the use set, not the def set).
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine, DFG - Data Flow Graph |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2016 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Dmitry Stogov <dmitry@zend.com> |
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+----------------------------------------------------------------------+
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*/
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#ifndef ZEND_DFG_H
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#define ZEND_DFG_H
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#include "zend_bitset.h"
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#include "zend_cfg.h"
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typedef struct _zend_dfg {
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int vars;
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uint32_t size;
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zend_bitset tmp;
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zend_bitset def;
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zend_bitset use;
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zend_bitset in;
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zend_bitset out;
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} zend_dfg;
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#define DFG_BITSET(set, set_size, block_num) \
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((set) + ((block_num) * (set_size)))
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#define DFG_SET(set, set_size, block_num, var_num) \
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zend_bitset_incl(DFG_BITSET(set, set_size, block_num), (var_num))
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#define DFG_ISSET(set, set_size, block_num, var_num) \
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zend_bitset_in(DFG_BITSET(set, set_size, block_num), (var_num))
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BEGIN_EXTERN_C()
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int zend_build_dfg(const zend_op_array *op_array, const zend_cfg *cfg, zend_dfg *dfg, uint32_t build_flags);
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END_EXTERN_C()
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#endif /* ZEND_DFG_H */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* indent-tabs-mode: t
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* End:
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*/
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