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Filename : zend_inference.h
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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 <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

#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"

#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_BE_IN_REG               (1<<29) /* deprecated and not used */

#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 || Z_TYPE_P(zv) == IS_TRUE || Z_TYPE_P(zv) == IS_FALSE || Z_TYPE_P(zv) == IS_NULL); \
		} 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 (Z_TYPE_P(zv) == IS_TRUE) { \
				return 1; \
			} else if (Z_TYPE_P(zv) == IS_FALSE) { \
				return 0; \
			} else if (Z_TYPE_P(zv) == IS_NULL) { \
				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.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 (Z_TYPE_P(zv) == IS_TRUE) { \
				return 1; \
			} else if (Z_TYPE_P(zv) == IS_FALSE) { \
				return 0; \
			} else if (Z_TYPE_P(zv) == IS_NULL) { \
				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.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 || Z_TYPE_P(zv) == IS_TRUE || Z_TYPE_P(zv) == IS_FALSE || Z_TYPE_P(zv) == IS_NULL) { \
				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 || Z_TYPE_P(zv) == IS_TRUE || Z_TYPE_P(zv) == IS_FALSE || Z_TYPE_P(zv) == IS_NULL) { \
				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))

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) {
		HashTable *ht = Z_ARRVAL_P(zv);
		uint32_t tmp = MAY_BE_ARRAY;
		zend_string *str;
		zval *val;

		if (Z_REFCOUNTED_P(zv)) {
			tmp |= MAY_BE_RC1 | MAY_BE_RCN;
		} else {
			tmp |= MAY_BE_RCN;
		}

		ZEND_HASH_FOREACH_STR_KEY_VAL(ht, str, val) {
			if (str) {
				tmp |= MAY_BE_ARRAY_KEY_STRING;
			} else {
				tmp |= MAY_BE_ARRAY_KEY_LONG;
			}
			tmp |= 1 << (Z_TYPE_P(val) + MAY_BE_ARRAY_SHIFT);
		} ZEND_HASH_FOREACH_END();
		if (HT_IS_PACKED(ht)) {
			tmp &= ~(MAY_BE_ARRAY_NUMERIC_HASH|MAY_BE_ARRAY_STRING_HASH);
		}
		return tmp;
	} 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 int zend_ssa_find_false_dependencies(const zend_op_array *op_array, zend_ssa *ssa);
ZEND_API int zend_ssa_find_sccs(const zend_op_array *op_array, zend_ssa *ssa);
ZEND_API int 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, zend_uchar op_type, int write, int insert);

ZEND_API int zend_inference_propagate_range(const zend_op_array *op_array, zend_ssa *ssa, zend_op *opline, zend_ssa_op* ssa_op, int var, zend_ssa_range *tmp);

ZEND_API uint32_t zend_fetch_arg_info_type(
	const zend_script *script, 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 int zend_may_throw_ex(const zend_op *opline, const zend_ssa_op *ssa_op, const zend_op_array *op_array, zend_ssa *ssa, uint32_t t1, uint32_t t2);
ZEND_API int zend_may_throw(const zend_op *opline, const zend_ssa_op *ssa_op, const zend_op_array *op_array, zend_ssa *ssa);

ZEND_API int 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 */