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/*
* Copyright (C) 2013, 2016 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 "ArrayBufferView.h"
#include "JSArrayBufferView.h"
#include "JSDataView.h"
namespace JSC {
inline bool JSArrayBufferView::isShared()
{
switch (m_mode) {
case WastefulTypedArray:
return existingBufferInButterfly()->isShared();
case DataViewMode:
return jsCast<JSDataView*>(this)->possiblySharedBuffer()->isShared();
default:
return false;
}
}
template<JSArrayBufferView::Requester requester>
inline ArrayBuffer* JSArrayBufferView::possiblySharedBufferImpl()
{
if (requester == ConcurrentThread)
ASSERT(m_mode != FastTypedArray && m_mode != OversizeTypedArray);
switch (m_mode) {
case WastefulTypedArray:
return existingBufferInButterfly();
case DataViewMode:
return jsCast<JSDataView*>(this)->possiblySharedBuffer();
case FastTypedArray:
case OversizeTypedArray:
return slowDownAndWasteMemory();
}
ASSERT_NOT_REACHED();
return nullptr;
}
inline ArrayBuffer* JSArrayBufferView::possiblySharedBuffer()
{
return possiblySharedBufferImpl<Mutator>();
}
inline ArrayBuffer* JSArrayBufferView::existingBufferInButterfly()
{
ASSERT(m_mode == WastefulTypedArray);
return butterfly()->indexingHeader()->arrayBuffer();
}
inline RefPtr<ArrayBufferView> JSArrayBufferView::unsharedImpl()
{
RefPtr<ArrayBufferView> result = possiblySharedImpl();
RELEASE_ASSERT(!result || !result->isShared());
return result;
}
template<JSArrayBufferView::Requester requester, typename ResultType>
inline ResultType JSArrayBufferView::byteOffsetImpl()
{
if (!hasArrayBuffer())
return 0;
if (requester == ConcurrentThread)
WTF::loadLoadFence();
ArrayBuffer* buffer = possiblySharedBufferImpl<requester>();
ASSERT(buffer);
if (requester == Mutator) {
ASSERT(!isCompilationThread());
ASSERT(!vector() == !buffer->data());
}
ptrdiff_t delta =
bitwise_cast<uint8_t*>(vectorWithoutPACValidation()) - static_cast<uint8_t*>(buffer->data());
unsigned result = static_cast<unsigned>(delta);
if (requester == Mutator)
ASSERT(static_cast<ptrdiff_t>(result) == delta);
else {
if (static_cast<ptrdiff_t>(result) != delta)
return { };
}
return result;
}
inline unsigned JSArrayBufferView::byteOffset()
{
return byteOffsetImpl<Mutator, unsigned>();
}
inline std::optional<unsigned> JSArrayBufferView::byteOffsetConcurrently()
{
return byteOffsetImpl<ConcurrentThread, std::optional<unsigned>>();
}
inline RefPtr<ArrayBufferView> JSArrayBufferView::toWrapped(VM& vm, JSValue value)
{
if (JSArrayBufferView* view = jsDynamicCast<JSArrayBufferView*>(vm, value)) {
if (!view->isShared())
return view->unsharedImpl();
}
return nullptr;
}
inline RefPtr<ArrayBufferView> JSArrayBufferView::toWrappedAllowShared(VM& vm, JSValue value)
{
if (JSArrayBufferView* view = jsDynamicCast<JSArrayBufferView*>(vm, value))
return view->possiblySharedImpl();
return nullptr;
}
} // namespace JSC
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