| /* |
| * Copyright (C) 2021 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 |
| |
| #if !ENABLE(C_LOOP) |
| |
| #include "RegisterSet.h" |
| |
| namespace JSC { |
| |
| class HashableRegisterSet : public RegisterSet { |
| enum State { |
| Normal, |
| Empty, |
| Deleted |
| }; |
| |
| public: |
| constexpr HashableRegisterSet() { } |
| |
| template<typename... Regs> |
| constexpr explicit HashableRegisterSet(Regs... regs) |
| : RegisterSet(regs...) |
| { |
| } |
| |
| enum EmptyValueTag { EmptyValue }; |
| enum DeletedValueTag { DeletedValue }; |
| |
| HashableRegisterSet(EmptyValueTag) |
| : m_state(Empty) |
| { |
| } |
| |
| HashableRegisterSet(DeletedValueTag) |
| : m_state(Deleted) |
| { |
| } |
| |
| bool isEmptyValue() const |
| { |
| return m_state == Empty; |
| } |
| |
| bool isDeletedValue() const |
| { |
| return m_state == Deleted; |
| } |
| |
| private: |
| State m_state { Normal }; |
| }; |
| |
| struct RegisterSetHash { |
| static unsigned hash(const HashableRegisterSet& set) { return set.hash(); } |
| static bool equal(const HashableRegisterSet& a, const HashableRegisterSet& b) { return a == b; } |
| static constexpr bool safeToCompareToEmptyOrDeleted = false; |
| }; |
| |
| } // namespace JSC |
| |
| namespace WTF { |
| |
| template<typename T> struct DefaultHash; |
| template<> struct DefaultHash<JSC::HashableRegisterSet> : JSC::RegisterSetHash { }; |
| |
| template<typename T> struct HashTraits; |
| template<> struct HashTraits<JSC::HashableRegisterSet> : public CustomHashTraits<JSC::HashableRegisterSet> { }; |
| |
| } // namespace WTF |
| |
| #endif // !ENABLE(C_LOOP) |
| |