97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
/*
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* Copyright (C) 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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#if !ENABLE(C_LOOP)
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#include "RegisterSet.h"
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namespace JSC {
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class HashableRegisterSet : public RegisterSet {
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enum State {
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Normal,
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Empty,
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Deleted
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};
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public:
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constexpr HashableRegisterSet() { }
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template<typename... Regs>
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constexpr explicit HashableRegisterSet(Regs... regs)
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: RegisterSet(regs...)
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{
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}
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enum EmptyValueTag { EmptyValue };
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enum DeletedValueTag { DeletedValue };
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HashableRegisterSet(EmptyValueTag)
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: m_state(Empty)
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{
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}
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HashableRegisterSet(DeletedValueTag)
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: m_state(Deleted)
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{
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}
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bool isEmptyValue() const
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{
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return m_state == Empty;
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}
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bool isDeletedValue() const
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{
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return m_state == Deleted;
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}
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private:
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State m_state { Normal };
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};
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struct RegisterSetHash {
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static unsigned hash(const HashableRegisterSet& set) { return set.hash(); }
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static bool equal(const HashableRegisterSet& a, const HashableRegisterSet& b) { return a == b; }
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static constexpr bool safeToCompareToEmptyOrDeleted = false;
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};
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} // namespace JSC
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namespace WTF {
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template<typename T> struct DefaultHash;
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template<> struct DefaultHash<JSC::HashableRegisterSet> : JSC::RegisterSetHash { };
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template<typename T> struct HashTraits;
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template<> struct HashTraits<JSC::HashableRegisterSet> : public CustomHashTraits<JSC::HashableRegisterSet> { };
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} // namespace WTF
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#endif // !ENABLE(C_LOOP)
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