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zend_cfg.h
/* +----------------------------------------------------------------------+ | Zend Engine, CFG - Control Flow Graph | +----------------------------------------------------------------------+ | Copyright (c) The PHP Group | +----------------------------------------------------------------------+ | This source file is subject to version 3.01 of the PHP license, | | that is bundled with this package in the file LICENSE, and is | | available through the world-wide-web at the following url: | | https://www.php.net/license/3_01.txt | | If you did not receive a copy of the PHP license and are unable to | | obtain it through the world-wide-web, please send a note to | | license@php.net so we can mail you a copy immediately. | +----------------------------------------------------------------------+ | Authors: Dmitry Stogov <dmitry@php.net> | +----------------------------------------------------------------------+ */ #ifndef ZEND_CFG_H #define ZEND_CFG_H /* zend_basic_block.flags */ #define ZEND_BB_START (1<<0) /* first block */ #define ZEND_BB_FOLLOW (1<<1) /* follows the next block */ #define ZEND_BB_TARGET (1<<2) /* jump target */ #define ZEND_BB_EXIT (1<<3) /* without successors */ #define ZEND_BB_ENTRY (1<<4) /* stackless entry */ #define ZEND_BB_TRY (1<<5) /* start of try block */ #define ZEND_BB_CATCH (1<<6) /* start of catch block */ #define ZEND_BB_FINALLY (1<<7) /* start of finally block */ #define ZEND_BB_FINALLY_END (1<<8) /* end of finally block */ #define ZEND_BB_UNREACHABLE_FREE (1<<11) /* unreachable loop free */ #define ZEND_BB_RECV_ENTRY (1<<12) /* RECV entry */ #define ZEND_BB_LOOP_HEADER (1<<16) #define ZEND_BB_IRREDUCIBLE_LOOP (1<<17) #define ZEND_BB_REACHABLE (1U<<31) #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) typedef struct _zend_basic_block { int *successors; /* successor block indices */ uint32_t flags; uint32_t start; /* first opcode number */ uint32_t len; /* number of opcodes */ int successors_count; /* number of successors */ int predecessors_count; /* number of predecessors */ int predecessor_offset; /* offset of 1-st predecessor */ int idom; /* immediate dominator block */ int loop_header; /* closest loop header, or -1 */ int level; /* steps away from the entry in the dom. tree */ int children; /* list of dominated blocks */ int next_child; /* next dominated block */ int successors_storage[2]; /* up to 2 successor blocks */ } zend_basic_block; /* +------------+---+---+---+---+---+ | |OP1|OP2|EXT| 0 | 1 | +------------+---+---+---+---+---+ |JMP |ADR| | |OP1| - | |JMPZ | |ADR| |OP2|FOL| |JMPNZ | |ADR| |OP2|FOL| |JMPZ_EX | |ADR| |OP2|FOL| |JMPNZ_EX | |ADR| |OP2|FOL| |JMP_SET | |ADR| |OP2|FOL| |COALESCE | |ADR| |OP2|FOL| |ASSERT_CHK | |ADR| |OP2|FOL| |NEW | |ADR| |OP2|FOL| |DCL_ANON* |ADR| | |OP1|FOL| |FE_RESET_* | |ADR| |OP2|FOL| |FE_FETCH_* | | |ADR|EXT|FOL| |CATCH | | |ADR|EXT|FOL| |FAST_CALL |ADR| | |OP1|FOL| |FAST_RET | | | | - | - | |RETURN* | | | | - | - | |EXIT | | | | - | - | |THROW | | | | - | - | |* | | | |FOL| - | +------------+---+---+---+---+---+ */ typedef struct _zend_cfg { int blocks_count; /* number of basic blocks */ int edges_count; /* number of edges */ zend_basic_block *blocks; /* array of basic blocks */ int *predecessors; uint32_t *map; uint32_t flags; } zend_cfg; /* Build Flags */ #define ZEND_CFG_STACKLESS (1<<30) #define ZEND_SSA_DEBUG_LIVENESS (1<<29) #define ZEND_SSA_DEBUG_PHI_PLACEMENT (1<<28) #define ZEND_SSA_RC_INFERENCE (1<<27) #define ZEND_CFG_NO_ENTRY_PREDECESSORS (1<<25) #define ZEND_CFG_RECV_ENTRY (1<<24) #define ZEND_CALL_TREE (1<<23) #define ZEND_SSA_USE_CV_RESULTS (1<<22) #define CRT_CONSTANT_EX(op_array, opline, node) \ (((op_array)->fn_flags & ZEND_ACC_DONE_PASS_TWO) ? \ RT_CONSTANT(opline, (node)) \ : \ CT_CONSTANT_EX(op_array, (node).constant) \ ) #define CRT_CONSTANT(node) \ CRT_CONSTANT_EX(op_array, opline, node) #define RETURN_VALUE_USED(opline) \ ((opline)->result_type != IS_UNUSED) BEGIN_EXTERN_C() ZEND_API void zend_build_cfg(zend_arena **arena, const zend_op_array *op_array, uint32_t build_flags, zend_cfg *cfg); void zend_cfg_remark_reachable_blocks(const zend_op_array *op_array, zend_cfg *cfg); ZEND_API void zend_cfg_build_predecessors(zend_arena **arena, zend_cfg *cfg); ZEND_API void zend_cfg_compute_dominators_tree(const zend_op_array *op_array, zend_cfg *cfg); ZEND_API void zend_cfg_identify_loops(const zend_op_array *op_array, zend_cfg *cfg); END_EXTERN_C() #endif /* ZEND_CFG_H */