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4543cd32ae
While JMPZNZ can avoid execution of a separate JMP opcode in some cases, it also prevents smart branch optimization, so creating JMPZNZ may actually have a negative effect. It also adds additional complexity for optimizations. Drop JMPZNZ in favor of JMPZ+JMP or JMPNZ+JMP. Closes GH-7857.
127 lines
5.5 KiB
C
127 lines
5.5 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine, CFG - Control Flow Graph |
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+----------------------------------------------------------------------+
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| Copyright (c) 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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| https://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@php.net> |
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+----------------------------------------------------------------------+
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*/
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#ifndef ZEND_CFG_H
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#define ZEND_CFG_H
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/* zend_basic_block.flags */
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#define ZEND_BB_START (1<<0) /* first block */
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#define ZEND_BB_FOLLOW (1<<1) /* follows the next block */
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#define ZEND_BB_TARGET (1<<2) /* jump target */
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#define ZEND_BB_EXIT (1<<3) /* without successors */
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#define ZEND_BB_ENTRY (1<<4) /* stackless entry */
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#define ZEND_BB_TRY (1<<5) /* start of try block */
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#define ZEND_BB_CATCH (1<<6) /* start of catch block */
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#define ZEND_BB_FINALLY (1<<7) /* start of finally block */
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#define ZEND_BB_FINALLY_END (1<<8) /* end of finally block */
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#define ZEND_BB_UNREACHABLE_FREE (1<<11) /* unreachable loop free */
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#define ZEND_BB_RECV_ENTRY (1<<12) /* RECV entry */
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#define ZEND_BB_LOOP_HEADER (1<<16)
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#define ZEND_BB_IRREDUCIBLE_LOOP (1<<17)
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#define ZEND_BB_REACHABLE (1U<<31)
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#define ZEND_BB_PROTECTED (ZEND_BB_ENTRY|ZEND_BB_RECV_ENTRY|ZEND_BB_TRY|ZEND_BB_CATCH|ZEND_BB_FINALLY|ZEND_BB_FINALLY_END|ZEND_BB_UNREACHABLE_FREE)
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typedef struct _zend_basic_block {
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int *successors; /* successor block indices */
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uint32_t flags;
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uint32_t start; /* first opcode number */
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uint32_t len; /* number of opcodes */
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int successors_count; /* number of successors */
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int predecessors_count; /* number of predecessors */
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int predecessor_offset; /* offset of 1-st predecessor */
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int idom; /* immediate dominator block */
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int loop_header; /* closest loop header, or -1 */
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int level; /* steps away from the entry in the dom. tree */
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int children; /* list of dominated blocks */
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int next_child; /* next dominated block */
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int successors_storage[2]; /* up to 2 successor blocks */
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} zend_basic_block;
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/*
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+------------+---+---+---+---+---+
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| |OP1|OP2|EXT| 0 | 1 |
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+------------+---+---+---+---+---+
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|JMP |ADR| | |OP1| - |
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|JMPZ | |ADR| |OP2|FOL|
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|JMPNZ | |ADR| |OP2|FOL|
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|JMPZ_EX | |ADR| |OP2|FOL|
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|JMPNZ_EX | |ADR| |OP2|FOL|
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|JMP_SET | |ADR| |OP2|FOL|
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|COALESCE | |ADR| |OP2|FOL|
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|ASSERT_CHK | |ADR| |OP2|FOL|
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|NEW | |ADR| |OP2|FOL|
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|DCL_ANON* |ADR| | |OP1|FOL|
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|FE_RESET_* | |ADR| |OP2|FOL|
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|FE_FETCH_* | | |ADR|EXT|FOL|
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|CATCH | | |ADR|EXT|FOL|
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|FAST_CALL |ADR| | |OP1|FOL|
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|FAST_RET | | | | - | - |
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|RETURN* | | | | - | - |
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|EXIT | | | | - | - |
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|THROW | | | | - | - |
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|* | | | |FOL| - |
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+------------+---+---+---+---+---+
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*/
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typedef struct _zend_cfg {
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int blocks_count; /* number of basic blocks */
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int edges_count; /* number of edges */
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zend_basic_block *blocks; /* array of basic blocks */
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int *predecessors;
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uint32_t *map;
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uint32_t flags;
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} zend_cfg;
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/* Build Flags */
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#define ZEND_CFG_STACKLESS (1<<30)
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#define ZEND_SSA_DEBUG_LIVENESS (1<<29)
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#define ZEND_SSA_DEBUG_PHI_PLACEMENT (1<<28)
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#define ZEND_SSA_RC_INFERENCE (1<<27)
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#define ZEND_CFG_NO_ENTRY_PREDECESSORS (1<<25)
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#define ZEND_CFG_RECV_ENTRY (1<<24)
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#define ZEND_CALL_TREE (1<<23)
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#define ZEND_SSA_USE_CV_RESULTS (1<<22)
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#define CRT_CONSTANT_EX(op_array, opline, node) \
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(((op_array)->fn_flags & ZEND_ACC_DONE_PASS_TWO) ? \
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RT_CONSTANT(opline, (node)) \
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: \
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CT_CONSTANT_EX(op_array, (node).constant) \
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)
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#define CRT_CONSTANT(node) \
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CRT_CONSTANT_EX(op_array, opline, node)
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#define RETURN_VALUE_USED(opline) \
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((opline)->result_type != IS_UNUSED)
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BEGIN_EXTERN_C()
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ZEND_API void zend_build_cfg(zend_arena **arena, const zend_op_array *op_array, uint32_t build_flags, zend_cfg *cfg);
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void zend_cfg_remark_reachable_blocks(const zend_op_array *op_array, zend_cfg *cfg);
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ZEND_API void zend_cfg_build_predecessors(zend_arena **arena, zend_cfg *cfg);
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ZEND_API void zend_cfg_compute_dominators_tree(const zend_op_array *op_array, zend_cfg *cfg);
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ZEND_API void zend_cfg_identify_loops(const zend_op_array *op_array, zend_cfg *cfg);
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END_EXTERN_C()
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#endif /* ZEND_CFG_H */
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