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/*
* Copyright (C) 2013-2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "DataView.h"
#include "JSArrayBufferView.h"
namespace JSC {
class JSDataView : public JSArrayBufferView {
public:
using Base = JSArrayBufferView;
static constexpr unsigned StructureFlags = Base::StructureFlags;
static constexpr unsigned elementSize = 1;
static constexpr TypedArrayContentType contentType = TypedArrayContentType::None;
template<typename CellType, SubspaceAccess mode>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return vm.dataViewSpace<mode>();
}
JS_EXPORT_PRIVATE static JSDataView* create(JSGlobalObject*, Structure*, RefPtr<ArrayBuffer>&&, size_t byteOffset, std::optional<size_t> byteLength);
// Dummy methods, which don't actually work; these are just in place to
// placate some template specialization we do elsewhere.
static JSDataView* createUninitialized(JSGlobalObject*, Structure*, size_t length);
static JSDataView* create(JSGlobalObject*, Structure*, size_t length);
bool setFromTypedArray(JSGlobalObject*, size_t offset, JSArrayBufferView*, size_t objectOffset, size_t length, CopyType);
bool setFromArrayLike(JSGlobalObject*, size_t offset, JSObject*, size_t objectOffset, size_t length);
bool setIndex(JSGlobalObject*, size_t, JSValue);
template<typename Getter>
std::optional<size_t> viewByteLength(Getter& getter)
{
// https://tc39.es/proposal-resizablearraybuffer/#sec-isviewoutofbounds
// https://tc39.es/proposal-resizablearraybuffer/#sec-getviewbytelength
if (UNLIKELY(isDetached()))
return std::nullopt;
if (LIKELY(canUseRawFieldsDirectly()))
return byteLengthRaw();
RefPtr<ArrayBuffer> buffer = possiblySharedBuffer();
if (!buffer)
return 0;
size_t bufferByteLength = getter(*buffer);
size_t byteOffset = byteOffsetRaw();
size_t byteLength = byteLengthRaw() + byteOffset; // Keep in mind that byteLengthRaw returns 0 for AutoLength TypedArray.
if (byteLength > bufferByteLength)
return std::nullopt;
if (isAutoLength())
return bufferByteLength - byteOffset;
return byteLengthRaw();
}
ArrayBuffer* possiblySharedBuffer() const { return m_buffer; }
ArrayBuffer* unsharedBuffer() const
{
RELEASE_ASSERT(!m_buffer->isShared());
return m_buffer;
}
static constexpr ptrdiff_t offsetOfBuffer() { return OBJECT_OFFSETOF(JSDataView, m_buffer); }
RefPtr<DataView> possiblySharedTypedImpl();
RefPtr<DataView> unsharedTypedImpl();
static constexpr TypedArrayType TypedArrayStorageType = TypeDataView;
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
DECLARE_EXPORT_INFO;
private:
JSDataView(VM&, ConstructionContext&, ArrayBuffer*);
ArrayBuffer* m_buffer;
};
class JSResizableOrGrowableSharedDataView final : public JSDataView {
public:
using Base = JSDataView;
using Base::StructureFlags;
static constexpr bool isResizableOrGrowableSharedTypedArray = true;
DECLARE_EXPORT_INFO;
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
};
} // namespace JSC
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