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29d058cec4
This patch implements ArrayBuffer and ArrayBuffer.prototype built-in objects. JerryScript-DCO-1.0-Signed-off-by: Zidong Jiang zidong.jiang@intel.com
124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
/* Copyright JS Foundation and other contributors, http://js.foundation
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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-arraybuffer-object.h"
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#include "ecma-conversion.h"
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#include "ecma-objects.h"
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#include "ecma-builtins.h"
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#include "ecma-exceptions.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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#ifndef CONFIG_DISABLE_ARRAYBUFFER_BUILTIN
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/** \addtogroup ecma ECMA
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* @{
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*
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* \addtogroup ecmaarraybufferobject ECMA ArrayBuffer object related routines
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* @{
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*/
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/**
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* ArrayBuffer object creation operation.
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*
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* See also: ES2015 24.1.1.1
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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_create_arraybuffer_object (const ecma_value_t *arguments_list_p, /**< list of arguments that
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* are passed to String constructor */
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ecma_length_t arguments_list_len) /**< length of the arguments' list */
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{
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JERRY_ASSERT (arguments_list_len == 0 || arguments_list_p != NULL);
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uint32_t length = 0;
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if (arguments_list_len > 0)
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{
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ecma_number_t num = ecma_get_number_from_value (ecma_op_to_number (arguments_list_p[0]));
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length = ecma_number_to_uint32 (num);
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if (num != ((ecma_number_t) length))
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{
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return ecma_raise_range_error (ECMA_ERR_MSG ("Invalid ArrayBuffer length."));
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}
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}
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ecma_object_t *object_p = ecma_arraybuffer_new_object (length);
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return ecma_make_object_value (object_p);
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} /* ecma_op_create_arraybuffer_object */
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/**
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* Helper function: create arraybuffer object based on the array length
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*
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* The struct of arraybuffer object:
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* ecma_object_t
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* extend_part
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* data buffer
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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_object_t *
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ecma_arraybuffer_new_object (ecma_length_t length) /**< length of the arraybuffer */
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{
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ecma_object_t *prototype_obj_p = ecma_builtin_get (ECMA_BUILTIN_ID_ARRAYBUFFER_PROTOTYPE);
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ecma_object_t *object_p = ecma_create_object (prototype_obj_p,
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sizeof (ecma_extended_object_t) + length,
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ECMA_OBJECT_TYPE_CLASS);
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ecma_deref_object (prototype_obj_p);
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ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
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ext_object_p->u.class_prop.class_id = LIT_MAGIC_STRING_ARRAY_BUFFER_UL;
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ext_object_p->u.class_prop.u.length = length;
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return object_p;
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} /* ecma_arraybuffer_new_object */
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/**
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* Helper function: return the length of the buffer inside the arraybuffer object
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*
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* @return ecma_length_t, the length of the arraybuffer
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*/
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inline ecma_length_t __attr_pure___ __attr_always_inline___
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ecma_arraybuffer_get_length (ecma_object_t *object_p) /**< pointer to the ArrayBuffer object */
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{
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JERRY_ASSERT (ecma_object_class_is (object_p, LIT_MAGIC_STRING_ARRAY_BUFFER_UL));
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ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
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return ext_object_p->u.class_prop.u.length;
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} /* ecma_arraybuffer_get_length */
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/**
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* Helper function: return the pointer to the data buffer inside the arraybuffer object
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*
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* @return pointer to the data buffer
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*/
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inline lit_utf8_byte_t * __attr_pure___ __attr_always_inline___
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ecma_arraybuffer_get_buffer (ecma_object_t *object_p) /**< pointer to the ArrayBuffer object */
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{
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JERRY_ASSERT (ecma_object_class_is (object_p, LIT_MAGIC_STRING_ARRAY_BUFFER_UL));
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ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
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return (lit_utf8_byte_t *) (ext_object_p + 1);
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} /* ecma_arraybuffer_get_buffer */
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/**
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* @}
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* @}
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*/
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#endif /* !CONFIG_DISABLE_ARRAYBUFFER_BUILTIN */
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