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1fba5ca8c3
This should be used instead of ArrayBuffer::create() in most places, as it uses OrdinaryCreateFromConstructor to allow for a custom prototype. The data block (ByteBuffer) is allocated separately and attached afterwards, if we didn't fail due to OOM.
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/ArrayBuffer.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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ArrayBuffer* ArrayBuffer::create(GlobalObject& global_object, size_t byte_length)
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{
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auto buffer = ByteBuffer::create_zeroed(byte_length);
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if (!buffer.has_value()) {
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global_object.vm().throw_exception<RangeError>(global_object, ErrorType::NotEnoughMemoryToAllocate, byte_length);
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return nullptr;
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}
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return global_object.heap().allocate<ArrayBuffer>(global_object, buffer.release_value(), *global_object.array_buffer_prototype());
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}
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ArrayBuffer* ArrayBuffer::create(GlobalObject& global_object, ByteBuffer* buffer)
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{
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return global_object.heap().allocate<ArrayBuffer>(global_object, buffer, *global_object.array_buffer_prototype());
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}
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ArrayBuffer::ArrayBuffer(ByteBuffer buffer, Object& prototype)
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: Object(prototype)
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, m_buffer(move(buffer))
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, m_detach_key(js_undefined())
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{
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}
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ArrayBuffer::ArrayBuffer(ByteBuffer* buffer, Object& prototype)
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: Object(prototype)
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, m_buffer(buffer)
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, m_detach_key(js_undefined())
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{
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}
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ArrayBuffer::~ArrayBuffer()
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{
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}
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void ArrayBuffer::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_detach_key);
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}
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// 25.1.2.1 AllocateArrayBuffer ( constructor, byteLength ), https://tc39.es/ecma262/#sec-allocatearraybuffer
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ThrowCompletionOr<ArrayBuffer*> allocate_array_buffer(GlobalObject& global_object, FunctionObject& constructor, size_t byte_length)
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{
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// 1. Let obj be ? OrdinaryCreateFromConstructor(constructor, "%ArrayBuffer.prototype%", « [[ArrayBufferData]], [[ArrayBufferByteLength]], [[ArrayBufferDetachKey]] »).
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auto* obj = TRY(ordinary_create_from_constructor<ArrayBuffer>(global_object, constructor, &GlobalObject::array_buffer_prototype, nullptr));
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// 2. Let block be ? CreateByteDataBlock(byteLength).
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auto block = ByteBuffer::create_zeroed(byte_length);
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if (!block.has_value())
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return global_object.vm().throw_completion<RangeError>(global_object, ErrorType::NotEnoughMemoryToAllocate, byte_length);
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// 3. Set obj.[[ArrayBufferData]] to block.
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obj->set_buffer(move(*block));
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// 4. Set obj.[[ArrayBufferByteLength]] to byteLength.
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// 5. Return obj.
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return obj;
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}
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}
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