102 lines
3.9 KiB
C++
102 lines
3.9 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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ThrowCompletionOr<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.is_error())
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return global_object.vm().throw_completion<RangeError>(global_object, ErrorType::NotEnoughMemoryToAllocate, byte_length);
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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, move(buffer), *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.is_error())
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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(block.release_value());
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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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// 25.1.2.4 CloneArrayBuffer ( srcBuffer, srcByteOffset, srcLength, cloneConstructor ), https://tc39.es/ecma262/#sec-clonearraybuffer
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ThrowCompletionOr<ArrayBuffer*> clone_array_buffer(GlobalObject& global_object, ArrayBuffer& source_buffer, size_t source_byte_offset, size_t source_length, FunctionObject& clone_constructor)
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{
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auto& vm = global_object.vm();
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// 1. Let targetBuffer be ? AllocateArrayBuffer(cloneConstructor, srcLength).
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auto* target_buffer = TRY(allocate_array_buffer(global_object, clone_constructor, source_length));
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// 2. If IsDetachedBuffer(srcBuffer) is true, throw a TypeError exception.
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if (source_buffer.is_detached())
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return vm.throw_completion<TypeError>(global_object, ErrorType::DetachedArrayBuffer);
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// 3. Let srcBlock be srcBuffer.[[ArrayBufferData]].
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auto& source_block = source_buffer.buffer();
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// 4. Let targetBlock be targetBuffer.[[ArrayBufferData]].
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auto& target_block = target_buffer->buffer();
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// 5. Perform CopyDataBlockBytes(targetBlock, 0, srcBlock, srcByteOffset, srcLength).
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// FIXME: This is only correct for ArrayBuffers, once SharedArrayBuffer is implemented, the AO has to be implemented
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target_block.overwrite(0, source_block.offset_pointer(source_byte_offset), source_length);
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// 6. Return targetBuffer.
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return target_buffer;
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}
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}
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