mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
141 lines
4.3 KiB
C++
141 lines
4.3 KiB
C++
/*
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* Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "ArrayBufferView.h"
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#include "JSArrayBufferView.h"
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#include "JSDataView.h"
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namespace JSC {
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inline bool JSArrayBufferView::isShared()
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{
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switch (m_mode) {
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case WastefulTypedArray:
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return existingBufferInButterfly()->isShared();
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case DataViewMode:
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return jsCast<JSDataView*>(this)->possiblySharedBuffer()->isShared();
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default:
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return false;
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}
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}
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template<JSArrayBufferView::Requester requester>
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inline ArrayBuffer* JSArrayBufferView::possiblySharedBufferImpl()
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{
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if (requester == ConcurrentThread)
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ASSERT(m_mode != FastTypedArray && m_mode != OversizeTypedArray);
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switch (m_mode) {
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case WastefulTypedArray:
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return existingBufferInButterfly();
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case DataViewMode:
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return jsCast<JSDataView*>(this)->possiblySharedBuffer();
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case FastTypedArray:
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case OversizeTypedArray:
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return slowDownAndWasteMemory();
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}
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ASSERT_NOT_REACHED();
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return nullptr;
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}
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inline ArrayBuffer* JSArrayBufferView::possiblySharedBuffer()
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{
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return possiblySharedBufferImpl<Mutator>();
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}
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inline ArrayBuffer* JSArrayBufferView::existingBufferInButterfly()
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{
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ASSERT(m_mode == WastefulTypedArray);
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return butterfly()->indexingHeader()->arrayBuffer();
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}
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inline RefPtr<ArrayBufferView> JSArrayBufferView::unsharedImpl()
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{
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RefPtr<ArrayBufferView> result = possiblySharedImpl();
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RELEASE_ASSERT(!result->isShared());
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return result;
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}
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template<JSArrayBufferView::Requester requester, typename ResultType>
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inline ResultType JSArrayBufferView::byteOffsetImpl()
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{
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if (!hasArrayBuffer())
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return 0;
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if (requester == ConcurrentThread)
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WTF::loadLoadFence();
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ArrayBuffer* buffer = possiblySharedBufferImpl<requester>();
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ASSERT(buffer);
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if (requester == Mutator) {
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ASSERT(!isCompilationThread());
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ASSERT(!vector() == !buffer->data());
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}
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ptrdiff_t delta =
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bitwise_cast<uint8_t*>(vector()) - static_cast<uint8_t*>(buffer->data());
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unsigned result = static_cast<unsigned>(delta);
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if (requester == Mutator)
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ASSERT(static_cast<ptrdiff_t>(result) == delta);
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else {
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if (static_cast<ptrdiff_t>(result) != delta)
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return { };
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}
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return result;
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}
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inline unsigned JSArrayBufferView::byteOffset()
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{
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return byteOffsetImpl<Mutator, unsigned>();
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}
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inline Optional<unsigned> JSArrayBufferView::byteOffsetConcurrently()
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{
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return byteOffsetImpl<ConcurrentThread, Optional<unsigned>>();
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}
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inline RefPtr<ArrayBufferView> JSArrayBufferView::toWrapped(VM& vm, JSValue value)
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{
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if (JSArrayBufferView* view = jsDynamicCast<JSArrayBufferView*>(vm, value)) {
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if (!view->isShared())
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return view->unsharedImpl();
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}
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return nullptr;
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}
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inline RefPtr<ArrayBufferView> JSArrayBufferView::toWrappedAllowShared(VM& vm, JSValue value)
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{
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if (JSArrayBufferView* view = jsDynamicCast<JSArrayBufferView*>(vm, value))
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return view->possiblySharedImpl();
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return nullptr;
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}
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} // namespace JSC
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