70 lines
2.8 KiB
C++
70 lines
2.8 KiB
C++
/*
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* Copyright (C) 2013-2021 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 "Handle.h"
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#include "TypedArrayController.h"
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#include "WeakHandleOwner.h"
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namespace JSC {
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// The default controller used for managing the relationship between
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// array buffers and their wrappers in JavaScriptCore. This isn't what
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// WebCore uses, but it is what JSC uses when running standalone. This
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// is pretty simple:
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//
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// - If the JSArrayBuffer is live, then the ArrayBuffer stays alive.
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//
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// - If there is a JSArrayBufferView that is holding an ArrayBuffer
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// then any existing wrapper for that ArrayBuffer will be kept
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// alive.
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//
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// - If you ask an ArrayBuffer for a JSArrayBuffer after one had
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// already been created and it didn't die, then you get the same
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// one.
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class SimpleTypedArrayController final : public TypedArrayController {
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public:
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JS_EXPORT_PRIVATE SimpleTypedArrayController(bool allowAtomicsWait = true);
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~SimpleTypedArrayController() final;
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JSArrayBuffer* toJS(JSGlobalObject*, JSGlobalObject*, ArrayBuffer*) final;
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void registerWrapper(JSGlobalObject*, ArrayBuffer*, JSArrayBuffer*) final;
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bool isAtomicsWaitAllowedOnCurrentThread() final;
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private:
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class JSArrayBufferOwner final : public WeakHandleOwner {
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public:
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bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, AbstractSlotVisitor&, const char** reason) final;
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void finalize(JSC::Handle<JSC::Unknown>, void* context) final;
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};
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JSArrayBufferOwner m_owner;
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bool m_allowAtomicsWait { false };
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};
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} // namespace JSC
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