mirror of
https://github.com/jerryscript-project/jerryscript.git
synced 2025-12-15 16:29:21 +00:00
6f33ab3e8f
The implementation is simplified and optimized resulting the removal a large amount of code. JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
406 lines
11 KiB
C
406 lines
11 KiB
C
/* Copyright 2014-2015 Samsung Electronics Co., Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ecma-comparison.h"
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#include "ecma-conversion.h"
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#include "ecma-globals.h"
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#include "ecma-try-catch-macro.h"
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#include "jrt.h"
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/** \addtogroup ecma ECMA
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* @{
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*
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* \addtogroup ecmacomparison ECMA comparison
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* @{
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*/
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/**
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* ECMA abstract equality comparison routine.
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*
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* See also: ECMA-262 v5, 11.9.3
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*
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* @return true - if values are equal,
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* false - otherwise.
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*/
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ecma_value_t
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ecma_op_abstract_equality_compare (ecma_value_t x, /**< first operand */
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ecma_value_t y) /**< second operand */
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{
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if (x == y)
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{
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return ecma_make_simple_value (ECMA_SIMPLE_VALUE_TRUE);
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}
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if (ecma_are_values_integer_numbers (x, y))
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{
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/* Note: the (x == y) comparison captures the true case. */
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return ecma_make_simple_value (ECMA_SIMPLE_VALUE_FALSE);
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}
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if (ecma_is_value_number (x))
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{
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if (ecma_is_value_number (y))
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{
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// 1.c
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ecma_number_t x_num = ecma_get_number_from_value (x);
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ecma_number_t y_num = ecma_get_number_from_value (y);
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bool is_x_equal_to_y = (x_num == y_num);
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#ifndef JERRY_NDEBUG
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bool is_x_equal_to_y_check;
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if (ecma_number_is_nan (x_num)
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|| ecma_number_is_nan (y_num))
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{
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is_x_equal_to_y_check = false;
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}
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else if (x_num == y_num
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|| (ecma_number_is_zero (x_num)
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&& ecma_number_is_zero (y_num)))
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{
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is_x_equal_to_y_check = true;
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}
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else
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{
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is_x_equal_to_y_check = false;
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}
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JERRY_ASSERT (is_x_equal_to_y == is_x_equal_to_y_check);
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#endif /* !JERRY_NDEBUG */
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return ecma_make_simple_value (is_x_equal_to_y ? ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
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}
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/* Swap values. */
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ecma_value_t tmp = x;
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x = y;
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y = tmp;
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}
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if (ecma_is_value_string (x))
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{
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if (ecma_is_value_string (y))
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{
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// 1., d.
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ecma_string_t *x_str_p = ecma_get_string_from_value (x);
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ecma_string_t *y_str_p = ecma_get_string_from_value (y);
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bool is_equal = ecma_compare_ecma_strings (x_str_p, y_str_p);
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return ecma_make_simple_value (is_equal ? ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
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}
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if (ecma_is_value_number (y))
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{
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// 4.
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ecma_value_t x_num_value = ecma_op_to_number (x);
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if (ecma_is_value_error (x_num_value))
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{
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return x_num_value;
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}
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ecma_value_t compare_result = ecma_op_abstract_equality_compare (x_num_value, y);
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ecma_free_value (x_num_value);
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return compare_result;
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}
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/* Swap values. */
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ecma_value_t tmp = x;
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x = y;
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y = tmp;
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}
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if (ecma_is_value_boolean (y))
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{
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if (ecma_is_value_boolean (x))
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{
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// 1., e.
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/* Note: the (x == y) comparison captures the true case. */
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return ecma_make_simple_value (ECMA_SIMPLE_VALUE_FALSE);
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}
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// 7.
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return ecma_op_abstract_equality_compare (x, ecma_make_integer_value (ecma_is_value_true (y) ? 1 : 0));
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}
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if (ecma_is_value_object (x))
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{
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if (ecma_is_value_string (y)
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|| ecma_is_value_number (y))
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{
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// 9.
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ecma_value_t x_prim_value = ecma_op_to_primitive (x, ECMA_PREFERRED_TYPE_NO);
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if (ecma_is_value_error (x_prim_value))
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{
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return x_prim_value;
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}
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ecma_value_t compare_result = ecma_op_abstract_equality_compare (x_prim_value, y);
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ecma_free_value (x_prim_value);
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return compare_result;
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}
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// 1., f.
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/* Note: the (x == y) comparison captures the true case. */
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return ecma_make_simple_value (ECMA_SIMPLE_VALUE_FALSE);
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}
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if (ecma_is_value_boolean (x))
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{
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// 6.
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return ecma_op_abstract_equality_compare (ecma_make_integer_value (ecma_is_value_true (x) ? 1 : 0), y);
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}
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if (ecma_is_value_undefined (x)
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|| ecma_is_value_null (x))
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{
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// 1. a., b.
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// 2., 3.
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bool is_equal = ecma_is_value_undefined (y) || ecma_is_value_null (y);
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return ecma_make_simple_value (is_equal ? ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
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}
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return ecma_make_simple_value (ECMA_SIMPLE_VALUE_FALSE);
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} /* ecma_op_abstract_equality_compare */
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/**
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* ECMA strict equality comparison routine.
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*
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* See also: ECMA-262 v5, 11.9.6
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*
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* @return true - if values are strict equal,
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* false - otherwise.
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*/
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bool
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ecma_op_strict_equality_compare (ecma_value_t x, /**< first operand */
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ecma_value_t y) /**< second operand */
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{
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if (ecma_is_value_direct (x)
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|| ecma_is_value_direct (y)
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|| ecma_is_value_object (x)
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|| ecma_is_value_object (y))
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{
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JERRY_ASSERT (!ecma_is_value_direct (x)
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|| ecma_is_value_undefined (x)
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|| ecma_is_value_null (x)
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|| ecma_is_value_boolean (x)
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|| ecma_is_value_integer_number (x));
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JERRY_ASSERT (!ecma_is_value_direct (y)
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|| ecma_is_value_undefined (y)
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|| ecma_is_value_null (y)
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|| ecma_is_value_boolean (y)
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|| ecma_is_value_integer_number (y));
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if ((x != ecma_make_integer_value (0) || !ecma_is_value_float_number (y))
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&& (y != ecma_make_integer_value (0) || !ecma_is_value_float_number (x)))
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{
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return (x == y);
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}
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/* The +0 === -0 case handled below. */
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}
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JERRY_ASSERT (ecma_is_value_number (x) || ecma_is_value_string (x));
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JERRY_ASSERT (ecma_is_value_number (y) || ecma_is_value_string (y));
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if (ecma_is_value_string (x))
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{
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if (!ecma_is_value_string (y))
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{
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return false;
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}
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ecma_string_t *x_str_p = ecma_get_string_from_value (x);
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ecma_string_t *y_str_p = ecma_get_string_from_value (y);
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return ecma_compare_ecma_strings (x_str_p, y_str_p);
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}
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if (!ecma_is_value_number (y))
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{
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return false;
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}
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ecma_number_t x_num = ecma_get_number_from_value (x);
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ecma_number_t y_num = ecma_get_number_from_value (y);
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bool is_x_equal_to_y = (x_num == y_num);
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#ifndef JERRY_NDEBUG
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bool is_x_equal_to_y_check;
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if (ecma_number_is_nan (x_num)
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|| ecma_number_is_nan (y_num))
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{
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is_x_equal_to_y_check = false;
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}
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else if (x_num == y_num
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|| (ecma_number_is_zero (x_num)
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&& ecma_number_is_zero (y_num)))
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{
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is_x_equal_to_y_check = true;
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}
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else
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{
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is_x_equal_to_y_check = false;
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}
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JERRY_ASSERT (is_x_equal_to_y == is_x_equal_to_y_check);
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#endif /* !JERRY_NDEBUG */
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return is_x_equal_to_y;
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} /* ecma_op_strict_equality_compare */
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/**
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* ECMA abstract relational comparison routine.
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*
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* See also: ECMA-262 v5, 11.8.5
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*
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* @return ecma value
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* Returned value must be freed with ecma_free_value
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*/
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ecma_value_t
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ecma_op_abstract_relational_compare (ecma_value_t x, /**< first operand */
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ecma_value_t y, /**< second operand */
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bool left_first) /**< 'LeftFirst' flag */
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{
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ecma_value_t ret_value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
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// 1., 2.
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ECMA_TRY_CATCH (prim_first_converted_value,
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ecma_op_to_primitive (x, ECMA_PREFERRED_TYPE_NUMBER),
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ret_value);
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ECMA_TRY_CATCH (prim_second_converted_value,
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ecma_op_to_primitive (y, ECMA_PREFERRED_TYPE_NUMBER),
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ret_value);
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const ecma_value_t px = left_first ? prim_first_converted_value : prim_second_converted_value;
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const ecma_value_t py = left_first ? prim_second_converted_value : prim_first_converted_value;
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const bool is_px_string = ecma_is_value_string (px);
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const bool is_py_string = ecma_is_value_string (py);
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if (!(is_px_string && is_py_string))
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{
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// 3.
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// a.
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ECMA_OP_TO_NUMBER_TRY_CATCH (nx, px, ret_value);
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ECMA_OP_TO_NUMBER_TRY_CATCH (ny, py, ret_value);
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// b.
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if (ecma_number_is_nan (nx)
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|| ecma_number_is_nan (ny))
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{
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// c., d.
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ret_value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
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}
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else
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{
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bool is_x_less_than_y = (nx < ny);
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#ifndef JERRY_NDEBUG
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bool is_x_less_than_y_check;
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if (nx == ny
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|| (ecma_number_is_zero (nx)
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&& ecma_number_is_zero (ny)))
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{
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// e., f., g.
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is_x_less_than_y_check = false;
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}
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else if (ecma_number_is_infinity (nx)
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&& !ecma_number_is_negative (nx))
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{
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// h.
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is_x_less_than_y_check = false;
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}
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else if (ecma_number_is_infinity (ny)
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&& !ecma_number_is_negative (ny))
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{
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// i.
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is_x_less_than_y_check = true;
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}
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else if (ecma_number_is_infinity (ny)
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&& ecma_number_is_negative (ny))
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{
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// j.
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is_x_less_than_y_check = false;
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}
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else if (ecma_number_is_infinity (nx)
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&& ecma_number_is_negative (nx))
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{
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// k.
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is_x_less_than_y_check = true;
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}
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else
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{
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// l.
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JERRY_ASSERT (!ecma_number_is_nan (nx)
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&& !ecma_number_is_infinity (nx));
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JERRY_ASSERT (!ecma_number_is_nan (ny)
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&& !ecma_number_is_infinity (ny));
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JERRY_ASSERT (!(ecma_number_is_zero (nx)
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&& ecma_number_is_zero (ny)));
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if (nx < ny)
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{
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is_x_less_than_y_check = true;
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}
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else
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{
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is_x_less_than_y_check = false;
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}
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}
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JERRY_ASSERT (is_x_less_than_y_check == is_x_less_than_y);
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#endif /* !JERRY_NDEBUG */
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ret_value = ecma_make_simple_value (is_x_less_than_y ? ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
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}
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ECMA_OP_TO_NUMBER_FINALIZE (ny);
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ECMA_OP_TO_NUMBER_FINALIZE (nx);
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}
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else
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{ // 4.
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JERRY_ASSERT (is_px_string && is_py_string);
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ecma_string_t *str_x_p = ecma_get_string_from_value (px);
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ecma_string_t *str_y_p = ecma_get_string_from_value (py);
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bool is_px_less = ecma_compare_ecma_strings_relational (str_x_p, str_y_p);
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ret_value = ecma_make_simple_value (is_px_less ? ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
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}
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ECMA_FINALIZE (prim_second_converted_value);
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ECMA_FINALIZE (prim_first_converted_value);
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return ret_value;
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} /* ecma_op_abstract_relational_compare */
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/**
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* @}
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* @}
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*/
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