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/* +----------------------------------------------------------------------+ | Zend Engine, e-SSA based Type & Range Inference | +----------------------------------------------------------------------+ | 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 | +----------------------------------------------------------------------+ */ #ifndef ZEND_INFERENCE_H #define ZEND_INFERENCE_H #include "zend_optimizer.h" #include "zend_ssa.h" #include "zend_bitset.h" /* Bitmask for type inference (zend_ssa_var_info.type) */ #include "zend_type_info.h" #include #define MAY_BE_PACKED_GUARD (1<<27) /* needs packed array guard */ #define MAY_BE_CLASS_GUARD (1<<27) /* needs class guard */ #define MAY_BE_GUARD (1<<28) /* needs type guard */ #define MAY_HAVE_DTOR \ (MAY_BE_OBJECT|MAY_BE_RESOURCE \ |MAY_BE_ARRAY_OF_ARRAY|MAY_BE_ARRAY_OF_OBJECT|MAY_BE_ARRAY_OF_RESOURCE) #define DEFINE_SSA_OP_HAS_RANGE(opN) \ static zend_always_inline bool _ssa_##opN##_has_range(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op *ssa_op) \ { \ if (opline->opN##_type == IS_CONST) { \ zval *zv = CRT_CONSTANT(opline->opN); \ return (Z_TYPE_P(zv) == IS_LONG); \ } else { \ return (opline->opN##_type != IS_UNUSED && \ ssa->var_info && \ ssa_op->opN##_use >= 0 && \ ssa->var_info[ssa_op->opN##_use].has_range); \ } \ return 0; \ } \ #define DEFINE_SSA_OP_MIN_RANGE(opN) \ static zend_always_inline zend_long _ssa_##opN##_min_range(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op *ssa_op) \ { \ if (opline->opN##_type == IS_CONST) { \ zval *zv = CRT_CONSTANT(opline->opN); \ if (Z_TYPE_P(zv) == IS_LONG) { \ return Z_LVAL_P(zv); \ } \ } else if (opline->opN##_type != IS_UNUSED && \ ssa->var_info && \ ssa_op->opN##_use >= 0 && \ ssa->var_info[ssa_op->opN##_use].has_range) { \ return ssa->var_info[ssa_op->opN##_use].range.min; \ } \ return ZEND_LONG_MIN; \ } \ #define DEFINE_SSA_OP_MAX_RANGE(opN) \ static zend_always_inline zend_long _ssa_##opN##_max_range(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op *ssa_op) \ { \ if (opline->opN##_type == IS_CONST) { \ zval *zv = CRT_CONSTANT(opline->opN); \ if (Z_TYPE_P(zv) == IS_LONG) { \ return Z_LVAL_P(zv); \ } \ } else if (opline->opN##_type != IS_UNUSED && \ ssa->var_info && \ ssa_op->opN##_use >= 0 && \ ssa->var_info[ssa_op->opN##_use].has_range) { \ return ssa->var_info[ssa_op->opN##_use].range.max; \ } \ return ZEND_LONG_MAX; \ } \ #define DEFINE_SSA_OP_RANGE_UNDERFLOW(opN) \ static zend_always_inline char _ssa_##opN##_range_underflow(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op *ssa_op) \ { \ if (opline->opN##_type == IS_CONST) { \ zval *zv = CRT_CONSTANT(opline->opN); \ if (Z_TYPE_P(zv) == IS_LONG) { \ return 0; \ } \ } else if (opline->opN##_type != IS_UNUSED && \ ssa->var_info && \ ssa_op->opN##_use >= 0 && \ ssa->var_info[ssa_op->opN##_use].has_range) { \ return ssa->var_info[ssa_op->opN##_use].range.underflow; \ } \ return 1; \ } \ #define DEFINE_SSA_OP_RANGE_OVERFLOW(opN) \ static zend_always_inline char _ssa_##opN##_range_overflow(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op *ssa_op) \ { \ if (opline->opN##_type == IS_CONST) { \ zval *zv = CRT_CONSTANT(opline->opN); \ if (Z_TYPE_P(zv) == IS_LONG) { \ return 0; \ } \ } else if (opline->opN##_type != IS_UNUSED && \ ssa->var_info && \ ssa_op->opN##_use >= 0 && \ ssa->var_info[ssa_op->opN##_use].has_range) { \ return ssa->var_info[ssa_op->opN##_use].range.overflow; \ } \ return 1; \ } \ DEFINE_SSA_OP_HAS_RANGE(op1) DEFINE_SSA_OP_MIN_RANGE(op1) DEFINE_SSA_OP_MAX_RANGE(op1) DEFINE_SSA_OP_RANGE_UNDERFLOW(op1) DEFINE_SSA_OP_RANGE_OVERFLOW(op1) DEFINE_SSA_OP_HAS_RANGE(op2) DEFINE_SSA_OP_MIN_RANGE(op2) DEFINE_SSA_OP_MAX_RANGE(op2) DEFINE_SSA_OP_RANGE_UNDERFLOW(op2) DEFINE_SSA_OP_RANGE_OVERFLOW(op2) #define OP1_HAS_RANGE() (_ssa_op1_has_range (op_array, ssa, opline, ssa_op)) #define OP1_MIN_RANGE() (_ssa_op1_min_range (op_array, ssa, opline, ssa_op)) #define OP1_MAX_RANGE() (_ssa_op1_max_range (op_array, ssa, opline, ssa_op)) #define OP1_RANGE_UNDERFLOW() (_ssa_op1_range_underflow (op_array, ssa, opline, ssa_op)) #define OP1_RANGE_OVERFLOW() (_ssa_op1_range_overflow (op_array, ssa, opline, ssa_op)) #define OP2_HAS_RANGE() (_ssa_op2_has_range (op_array, ssa, opline, ssa_op)) #define OP2_MIN_RANGE() (_ssa_op2_min_range (op_array, ssa, opline, ssa_op)) #define OP2_MAX_RANGE() (_ssa_op2_max_range (op_array, ssa, opline, ssa_op)) #define OP2_RANGE_UNDERFLOW() (_ssa_op2_range_underflow (op_array, ssa, opline, ssa_op)) #define OP2_RANGE_OVERFLOW() (_ssa_op2_range_overflow (op_array, ssa, opline, ssa_op)) BEGIN_EXTERN_C() ZEND_API uint32_t ZEND_FASTCALL zend_array_type_info(const zval *zv); END_EXTERN_C() static zend_always_inline uint32_t _const_op_type(const zval *zv) { if (Z_TYPE_P(zv) == IS_CONSTANT_AST) { return MAY_BE_RC1 | MAY_BE_RCN | MAY_BE_ANY | MAY_BE_ARRAY_KEY_ANY | MAY_BE_ARRAY_OF_ANY; } else if (Z_TYPE_P(zv) == IS_ARRAY) { return zend_array_type_info(zv); } else { uint32_t tmp = (1 << Z_TYPE_P(zv)); if (Z_REFCOUNTED_P(zv)) { tmp |= MAY_BE_RC1 | MAY_BE_RCN; } else if (Z_TYPE_P(zv) == IS_STRING) { tmp |= MAY_BE_RCN; } return tmp; } } static zend_always_inline uint32_t get_ssa_var_info(const zend_ssa *ssa, int ssa_var_num) { if (ssa->var_info && ssa_var_num >= 0) { return ssa->var_info[ssa_var_num].type; } else { return MAY_BE_UNDEF | MAY_BE_RC1 | MAY_BE_RCN | MAY_BE_REF | MAY_BE_INDIRECT | MAY_BE_ANY | MAY_BE_ARRAY_KEY_ANY | MAY_BE_ARRAY_OF_ANY | MAY_BE_ARRAY_OF_REF; } } #define DEFINE_SSA_OP_INFO(opN) \ static zend_always_inline uint32_t _ssa_##opN##_info(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op *ssa_op) \ { \ if (opline->opN##_type == IS_CONST) { \ return _const_op_type(CRT_CONSTANT(opline->opN)); \ } else { \ return get_ssa_var_info(ssa, ssa->var_info ? ssa_op->opN##_use : -1); \ } \ } \ #define DEFINE_SSA_OP_DEF_INFO(opN) \ static zend_always_inline uint32_t _ssa_##opN##_def_info(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op *ssa_op) \ { \ return get_ssa_var_info(ssa, ssa->var_info ? ssa_op->opN##_def : -1); \ } \ DEFINE_SSA_OP_INFO(op1) DEFINE_SSA_OP_INFO(op2) DEFINE_SSA_OP_INFO(result) DEFINE_SSA_OP_DEF_INFO(op1) DEFINE_SSA_OP_DEF_INFO(op2) DEFINE_SSA_OP_DEF_INFO(result) #define OP1_INFO() (_ssa_op1_info(op_array, ssa, opline, ssa_op)) #define OP2_INFO() (_ssa_op2_info(op_array, ssa, opline, ssa_op)) #define OP1_DATA_INFO() (_ssa_op1_info(op_array, ssa, (opline+1), (ssa_op+1))) #define OP2_DATA_INFO() (_ssa_op2_info(op_array, ssa, (opline+1), (ssa_op+1))) #define RES_USE_INFO() (_ssa_result_info(op_array, ssa, opline, ssa_op)) #define OP1_DEF_INFO() (_ssa_op1_def_info(op_array, ssa, opline, ssa_op)) #define OP2_DEF_INFO() (_ssa_op2_def_info(op_array, ssa, opline, ssa_op)) #define OP1_DATA_DEF_INFO() (_ssa_op1_def_info(op_array, ssa, (opline+1), (ssa_op+1))) #define OP2_DATA_DEF_INFO() (_ssa_op2_def_info(op_array, ssa, (opline+1), (ssa_op+1))) #define RES_INFO() (_ssa_result_def_info(op_array, ssa, opline, ssa_op)) static zend_always_inline bool zend_add_will_overflow(zend_long a, zend_long b) { return (b > 0 && a > ZEND_LONG_MAX - b) || (b < 0 && a < ZEND_LONG_MIN - b); } static zend_always_inline bool zend_sub_will_overflow(zend_long a, zend_long b) { return (b > 0 && a < ZEND_LONG_MIN + b) || (b < 0 && a > ZEND_LONG_MAX + b); } BEGIN_EXTERN_C() ZEND_API void zend_ssa_find_false_dependencies(const zend_op_array *op_array, zend_ssa *ssa); ZEND_API void zend_ssa_find_sccs(const zend_op_array *op_array, zend_ssa *ssa); ZEND_API zend_result zend_ssa_inference(zend_arena **raena, const zend_op_array *op_array, const zend_script *script, zend_ssa *ssa, zend_long optimization_level); ZEND_API uint32_t zend_array_element_type(uint32_t t1, uint8_t op_type, int write, int insert); ZEND_API bool zend_inference_propagate_range(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op *opline, const zend_ssa_op* ssa_op, int var, zend_ssa_range *tmp); ZEND_API uint32_t zend_fetch_arg_info_type( const zend_script *script, const zend_arg_info *arg_info, zend_class_entry **pce); ZEND_API void zend_init_func_return_info( const zend_op_array *op_array, const zend_script *script, zend_ssa_var_info *ret); uint32_t zend_get_return_info_from_signature_only( const zend_function *func, const zend_script *script, zend_class_entry **ce, bool *ce_is_instanceof, bool use_tentative_return_info); ZEND_API bool zend_may_throw_ex(const zend_op *opline, const zend_ssa_op *ssa_op, const zend_op_array *op_array, const zend_ssa *ssa, uint32_t t1, uint32_t t2); ZEND_API bool zend_may_throw(const zend_op *opline, const zend_ssa_op *ssa_op, const zend_op_array *op_array, const zend_ssa *ssa); ZEND_API zend_result zend_update_type_info( const zend_op_array *op_array, zend_ssa *ssa, const zend_script *script, zend_op *opline, zend_ssa_op *ssa_op, const zend_op **ssa_opcodes, zend_long optimization_level); END_EXTERN_C() #endif /* ZEND_INFERENCE_H */