mirror of
https://github.com/jerryscript-project/jerryscript.git
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129 lines
3.5 KiB
C++
129 lines
3.5 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-gc.h"
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#include "ecma-globals.h"
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#include "ecma-helpers.h"
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#include "ecma-lex-env.h"
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#include "ecma-reference.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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/**
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* \addtogroup references ECMA-Reference
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* @{
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*/
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/**
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* Resolve syntactic reference.
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*
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* @return if reference was resolved successfully,
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* pointer to lexical environment - reference's base,
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* else - NULL.
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*/
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ecma_object_t*
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ecma_op_resolve_reference_base (ecma_object_t *lex_env_p, /**< starting lexical environment */
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ecma_string_t *name_p) /**< identifier's name */
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{
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JERRY_ASSERT(lex_env_p != NULL);
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ecma_object_t *lex_env_iter_p = lex_env_p;
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while (lex_env_iter_p != NULL)
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{
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if (ecma_op_has_binding (lex_env_iter_p, name_p))
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{
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return lex_env_iter_p;
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}
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lex_env_iter_p = ecma_get_lex_env_outer_reference (lex_env_iter_p);
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}
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return NULL;
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} /* ecma_op_resolve_reference_base */
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/**
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* Resolve syntactic reference to ECMA-reference.
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*
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* @return ECMA-reference
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* Returned value must be freed through ecma_free_reference.
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*/
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ecma_reference_t
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ecma_op_get_identifier_reference (ecma_object_t *lex_env_p, /**< lexical environment */
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ecma_string_t *name_p, /**< identifier's name */
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bool is_strict) /**< strict reference flag */
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{
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JERRY_ASSERT(lex_env_p != NULL);
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ecma_object_t *base_lex_env_p = ecma_op_resolve_reference_base (lex_env_p, name_p);
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if (base_lex_env_p != NULL)
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{
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return ecma_make_reference (ecma_make_object_value (base_lex_env_p),
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name_p,
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is_strict);
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}
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else
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{
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return ecma_make_reference (ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED),
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name_p,
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is_strict);
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}
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} /* ecma_op_get_identifier_reference */
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/**
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* ECMA-reference constructor.
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*
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* @return ECMA-reference
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* Returned value must be freed through ecma_free_reference.
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*/
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ecma_reference_t
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ecma_make_reference (const ecma_value_t& base, /**< base value */
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ecma_string_t *name_p, /**< referenced name */
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bool is_strict) /**< strict reference flag */
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{
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name_p = ecma_copy_or_ref_ecma_string (name_p);
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ecma_reference_t ref;
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ref.base = ecma_copy_value (base, true);
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ref.is_strict = (is_strict != 0);
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ECMA_SET_POINTER (ref.referenced_name_cp, name_p);
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return ref;
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} /* ecma_make_reference */
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/**
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* Free specified ECMA-reference.
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*
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* Warning:
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* freeing invalidates all copies of the reference.
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*/
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void
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ecma_free_reference (ecma_reference_t ref) /**< reference */
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{
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ecma_free_value (ref.base, true);
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ecma_deref_ecma_string (ECMA_GET_NON_NULL_POINTER (ecma_string_t,
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ref.referenced_name_cp));
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} /* ecma_free_reference */
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/**
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* @}
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* @}
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*/
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