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/*
+----------------------------------------------------------------------+
| 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 */
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