mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
/*
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* Copyright (C) 2012-2018 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 "JSCPtrTag.h"
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#include "JSFunction.h"
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#include "MacroAssemblerCodeRef.h"
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#include <wtf/SentinelLinkedList.h>
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namespace JSC {
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struct Instruction;
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class LLIntCallLinkInfo : public PackedRawSentinelNode<LLIntCallLinkInfo> {
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public:
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friend class LLIntOffsetsExtractor;
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static constexpr uintptr_t unlinkedBit = 0x1;
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LLIntCallLinkInfo() = default;
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~LLIntCallLinkInfo()
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{
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if (isOnList())
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remove();
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}
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bool isLinked() const { return !(m_calleeOrLastSeenCalleeWithLinkBit & unlinkedBit); }
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void link(VM& vm, JSCell* owner, JSObject* callee, MacroAssemblerCodePtr<JSEntryPtrTag> codePtr)
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{
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if (isOnList())
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remove();
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m_calleeOrLastSeenCalleeWithLinkBit = bitwise_cast<uintptr_t>(callee);
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vm.heap.writeBarrier(owner, callee);
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m_machineCodeTarget = codePtr;
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}
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void unlink()
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{
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// Make link invalidated. It works because LLInt tests the given callee with this pointer. But it is still valid as lastSeenCallee!
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m_calleeOrLastSeenCalleeWithLinkBit |= unlinkedBit;
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m_machineCodeTarget = MacroAssemblerCodePtr<JSEntryPtrTag>();
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if (isOnList())
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remove();
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}
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JSObject* callee() const
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{
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if (!isLinked())
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return nullptr;
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return bitwise_cast<JSObject*>(m_calleeOrLastSeenCalleeWithLinkBit);
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}
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JSObject* lastSeenCallee() const
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{
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return bitwise_cast<JSObject*>(m_calleeOrLastSeenCalleeWithLinkBit & ~unlinkedBit);
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}
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void clearLastSeenCallee()
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{
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m_calleeOrLastSeenCalleeWithLinkBit = unlinkedBit;
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}
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ArrayProfile m_arrayProfile;
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private:
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uintptr_t m_calleeOrLastSeenCalleeWithLinkBit { unlinkedBit };
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MacroAssemblerCodePtr<JSEntryPtrTag> m_machineCodeTarget;
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};
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} // namespace JSC
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