mirror of
https://github.com/jerryscript-project/jerryscript.git
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524 lines
14 KiB
C
524 lines
14 KiB
C
/* Copyright 2015-2016 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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/** \addtogroup ecma ECMA
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* @{
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*
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* \addtogroup ecmahelpers Helpers for operations with ECMA data types
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* @{
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*/
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#include "ecma-alloc.h"
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#include "ecma-gc.h"
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#include "ecma-globals.h"
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#include "ecma-helpers.h"
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#include "jrt.h"
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#include "jrt-bit-fields.h"
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#include "vm-defines.h"
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JERRY_STATIC_ASSERT (sizeof (ecma_value_t) * JERRY_BITSINBYTE >= ECMA_VALUE_SIZE,
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bits_in_ecma_value_t_must_be_greater_than_or_equal_to_ECMA_VALUE_SIZE);
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/**
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* Get type field of ecma value
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*
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* @return type field
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*/
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ecma_type_t __attr_pure___
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ecma_get_value_type_field (ecma_value_t value) /**< ecma value */
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{
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return (ecma_type_t) JRT_EXTRACT_BIT_FIELD (ecma_value_t, value,
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ECMA_VALUE_TYPE_POS,
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ECMA_VALUE_TYPE_WIDTH);
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} /* ecma_get_value_type_field */
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/**
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* Get value field of ecma value
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*
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* @return value field
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*/
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static uintptr_t __attr_pure___
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ecma_get_value_value_field (ecma_value_t value) /**< ecma value */
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{
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return (uintptr_t) JRT_EXTRACT_BIT_FIELD (ecma_value_t, value,
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ECMA_VALUE_VALUE_POS,
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ECMA_VALUE_VALUE_WIDTH);
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} /* ecma_get_value_value_field */
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/**
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* Set type field of ecma value
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*
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* @return ecma value with updated field
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*/
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static ecma_value_t __attr_pure___
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ecma_set_value_type_field (ecma_value_t value, /**< ecma value to set field in */
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ecma_type_t type_field) /**< new field value */
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{
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return JRT_SET_BIT_FIELD_VALUE (ecma_value_t, value,
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type_field,
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ECMA_VALUE_TYPE_POS,
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ECMA_VALUE_TYPE_WIDTH);
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} /* ecma_set_value_type_field */
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/**
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* Set value field of ecma value
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*
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* @return ecma value with updated field
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*/
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static ecma_value_t __attr_pure___
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ecma_set_value_value_field (ecma_value_t value, /**< ecma value to set field in */
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uintptr_t value_field) /**< new field value */
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{
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return JRT_SET_BIT_FIELD_VALUE (ecma_value_t, value,
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value_field,
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ECMA_VALUE_VALUE_POS,
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ECMA_VALUE_VALUE_WIDTH);
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} /* ecma_set_value_value_field */
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/**
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* Check if the value is empty.
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*
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* @return true - if the value contains implementation-defined empty simple value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_empty (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_SIMPLE
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&& ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_EMPTY);
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} /* ecma_is_value_empty */
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/**
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* Check if the value is undefined.
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*
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* @return true - if the value contains ecma-undefined simple value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_undefined (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_SIMPLE
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&& ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_UNDEFINED);
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} /* ecma_is_value_undefined */
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/**
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* Check if the value is null.
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*
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* @return true - if the value contains ecma-null simple value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_null (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_SIMPLE
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&& ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_NULL);
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} /* ecma_is_value_null */
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/**
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* Check if the value is boolean.
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*
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* @return true - if the value contains ecma-true or ecma-false simple values,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_boolean (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_SIMPLE
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&& (ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_TRUE
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|| ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_FALSE));
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} /* ecma_is_value_boolean */
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/**
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* Check if the value is true.
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*
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* @return true - if the value contains ecma-true simple value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_true (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_SIMPLE
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&& ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_TRUE);
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} /* ecma_is_value_true */
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/**
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* Check if the value is false.
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*
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* @return true - if the value contains ecma-false simple value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_false (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_SIMPLE
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&& ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_FALSE);
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} /* ecma_is_value_false */
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/**
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* Check if the value is array hole.
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*
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* @return true - if the value contains ecma-array-hole simple value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_array_hole (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_SIMPLE
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&& ecma_get_value_value_field (value) == ECMA_SIMPLE_VALUE_ARRAY_HOLE);
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} /* ecma_is_value_array_hole */
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/**
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* Check if the value is ecma-number.
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*
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* @return true - if the value contains ecma-number value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_number (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_NUMBER);
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} /* ecma_is_value_number */
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/**
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* Check if the value is ecma-string.
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*
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* @return true - if the value contains ecma-string value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_string (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_STRING);
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} /* ecma_is_value_string */
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/**
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* Check if the value is object.
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*
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* @return true - if the value contains object value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_object (ecma_value_t value) /**< ecma value */
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{
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return (ecma_get_value_type_field (value) == ECMA_TYPE_OBJECT);
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} /* ecma_is_value_object */
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/**
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* Check if the value is an error value.
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*
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* @return true - if the value contains an error value,
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* false - otherwise.
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*/
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bool __attr_pure___ __attr_always_inline___
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ecma_is_value_error (ecma_value_t value) /**< ecma value */
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{
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return (value & (1u << ECMA_VALUE_ERROR_POS)) != 0;
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} /* ecma_is_value_error */
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/**
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* Debug assertion that specified value's type is one of ECMA-defined
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* script-visible types, i.e.: undefined, null, boolean, number, string, object.
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*/
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void
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ecma_check_value_type_is_spec_defined (ecma_value_t value) /**< ecma value */
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{
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JERRY_ASSERT (ecma_is_value_undefined (value)
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|| ecma_is_value_null (value)
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|| ecma_is_value_boolean (value)
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|| ecma_is_value_number (value)
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|| ecma_is_value_string (value)
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|| ecma_is_value_object (value));
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} /* ecma_check_value_type_is_spec_defined */
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/**
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* Simple value constructor
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*/
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ecma_value_t __attr_const___ __attr_always_inline___
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ecma_make_simple_value (const ecma_simple_value_t value) /**< simple value */
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{
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ecma_value_t ret_value = 0;
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ret_value = ecma_set_value_type_field (ret_value, ECMA_TYPE_SIMPLE);
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ret_value = ecma_set_value_value_field (ret_value, value);
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return ret_value;
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} /* ecma_make_simple_value */
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/**
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* Number value constructor
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*/
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ecma_value_t __attr_const___
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ecma_make_number_value (const ecma_number_t *num_p) /**< number to reference in value */
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{
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JERRY_ASSERT (num_p != NULL);
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mem_cpointer_t num_cp;
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ECMA_SET_NON_NULL_POINTER (num_cp, num_p);
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ecma_value_t ret_value = 0;
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ret_value = ecma_set_value_type_field (ret_value, ECMA_TYPE_NUMBER);
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ret_value = ecma_set_value_value_field (ret_value, num_cp);
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return ret_value;
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} /* ecma_make_number_value */
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/**
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* String value constructor
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*/
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ecma_value_t __attr_const___
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ecma_make_string_value (const ecma_string_t *ecma_string_p) /**< string to reference in value */
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{
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JERRY_ASSERT (ecma_string_p != NULL);
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mem_cpointer_t string_cp;
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ECMA_SET_NON_NULL_POINTER (string_cp, ecma_string_p);
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ecma_value_t ret_value = 0;
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ret_value = ecma_set_value_type_field (ret_value, ECMA_TYPE_STRING);
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ret_value = ecma_set_value_value_field (ret_value, string_cp);
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return ret_value;
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} /* ecma_make_string_value */
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/**
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* Object value constructor
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*/
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ecma_value_t __attr_const___
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ecma_make_object_value (const ecma_object_t *object_p) /**< object to reference in value */
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{
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JERRY_ASSERT (object_p != NULL);
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mem_cpointer_t object_cp;
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ECMA_SET_NON_NULL_POINTER (object_cp, object_p);
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ecma_value_t ret_value = 0;
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ret_value = ecma_set_value_type_field (ret_value, ECMA_TYPE_OBJECT);
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ret_value = ecma_set_value_value_field (ret_value, object_cp);
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return ret_value;
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} /* ecma_make_object_value */
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/**
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* Error value constructor
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*/
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ecma_value_t __attr_const___
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ecma_make_error_value (ecma_value_t value) /**< original ecma value */
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{
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/* Error values cannot be converted. */
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JERRY_ASSERT (!ecma_is_value_error (value));
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return value | (1u << ECMA_VALUE_ERROR_POS);
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} /* ecma_make_error_value */
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/**
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* Error value constructor
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*/
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ecma_value_t __attr_const___
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ecma_make_error_obj_value (const ecma_object_t *object_p) /**< object to reference in value */
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{
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return ecma_make_error_value (ecma_make_object_value (object_p));
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} /* ecma_make_error_obj_value */
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/**
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* Get pointer to ecma-number from ecma value
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*
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* @return the pointer
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*/
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ecma_number_t *__attr_pure___
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ecma_get_number_from_value (ecma_value_t value) /**< ecma value */
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{
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JERRY_ASSERT (ecma_get_value_type_field (value) == ECMA_TYPE_NUMBER);
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return ECMA_GET_NON_NULL_POINTER (ecma_number_t,
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ecma_get_value_value_field (value));
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} /* ecma_get_number_from_value */
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/**
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* Get pointer to ecma-string from ecma value
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*
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* @return the pointer
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*/
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ecma_string_t *__attr_pure___
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ecma_get_string_from_value (ecma_value_t value) /**< ecma value */
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{
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JERRY_ASSERT (ecma_get_value_type_field (value) == ECMA_TYPE_STRING);
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return ECMA_GET_NON_NULL_POINTER (ecma_string_t,
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ecma_get_value_value_field (value));
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} /* ecma_get_string_from_value */
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/**
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* Get pointer to ecma-object from ecma value
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*
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* @return the pointer
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*/
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ecma_object_t *__attr_pure___
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ecma_get_object_from_value (ecma_value_t value) /**< ecma value */
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{
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JERRY_ASSERT (ecma_get_value_type_field (value) == ECMA_TYPE_OBJECT);
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return ECMA_GET_NON_NULL_POINTER (ecma_object_t,
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ecma_get_value_value_field (value));
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} /* ecma_get_object_from_value */
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/**
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* Get the value from an error ecma value
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*
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* @return ecma value
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*/
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ecma_value_t __attr_pure___
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ecma_get_value_from_error_value (ecma_value_t value) /**< ecma value */
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{
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JERRY_ASSERT (ecma_is_value_error (value));
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value = (ecma_value_t) (value & ~(1u << ECMA_VALUE_ERROR_POS));
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JERRY_ASSERT (!ecma_is_value_error (value));
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return value;
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} /* ecma_get_value_from_error_value */
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/**
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* Copy ecma value.
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*
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* Note:
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* Operation algorithm.
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* switch (valuetype)
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* case simple:
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* simply return the value as it was passed;
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* case number:
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* copy the number
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* and return new ecma value
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* pointing to copy of the number;
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* case string:
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* increase reference counter of the string
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* and return the value as it was passed.
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* case object;
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* increase reference counter of the object if do_ref_if_object is true
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* and return the value as it was passed.
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*
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* @return See note.
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*/
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ecma_value_t
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ecma_copy_value (ecma_value_t value, /**< ecma value */
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bool do_ref_if_object) /**< if the value is object value,
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increment reference counter of the object */
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{
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ecma_value_t value_copy = 0;
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switch (ecma_get_value_type_field (value))
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{
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case ECMA_TYPE_SIMPLE:
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{
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value_copy = value;
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break;
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}
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case ECMA_TYPE_NUMBER:
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{
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ecma_number_t *num_p = ecma_get_number_from_value (value);
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ecma_number_t *number_copy_p = ecma_alloc_number ();
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*number_copy_p = *num_p;
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value_copy = ecma_make_number_value (number_copy_p);
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break;
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}
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case ECMA_TYPE_STRING:
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{
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ecma_string_t *string_p = ecma_get_string_from_value (value);
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string_p = ecma_copy_or_ref_ecma_string (string_p);
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value_copy = ecma_make_string_value (string_p);
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break;
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}
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case ECMA_TYPE_OBJECT:
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{
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ecma_object_t *obj_p = ecma_get_object_from_value (value);
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if (do_ref_if_object)
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{
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ecma_ref_object (obj_p);
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}
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value_copy = value;
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break;
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}
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}
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return value_copy;
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} /* ecma_copy_value */
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/**
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* Free the ecma value
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*/
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void
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ecma_free_value (ecma_value_t value) /**< value description */
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{
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switch (ecma_get_value_type_field (value))
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{
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case ECMA_TYPE_SIMPLE:
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{
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/* doesn't hold additional memory */
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break;
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}
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case ECMA_TYPE_NUMBER:
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{
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ecma_number_t *number_p = ecma_get_number_from_value (value);
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ecma_dealloc_number (number_p);
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break;
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}
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case ECMA_TYPE_STRING:
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{
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ecma_string_t *string_p = ecma_get_string_from_value (value);
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ecma_deref_ecma_string (string_p);
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break;
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}
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case ECMA_TYPE_OBJECT:
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{
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ecma_deref_object (ecma_get_object_from_value (value));
|
|
break;
|
|
}
|
|
}
|
|
} /* ecma_free_value */
|
|
|
|
/**
|
|
* Free the ecma value if not an object
|
|
*/
|
|
void
|
|
ecma_free_value_if_not_object (ecma_value_t value) /**< value description */
|
|
{
|
|
if (ecma_get_value_type_field (value) != ECMA_TYPE_OBJECT)
|
|
{
|
|
ecma_free_value (value);
|
|
}
|
|
} /* ecma_free_value_if_not_object */
|
|
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|