| /* |
| * Copyright (C) 2017-2019 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 |
| |
| #include <wtf/HashTable.h> |
| |
| namespace JSC { |
| |
| class FunctionExecutable; |
| class JSGlobalObject; |
| class JSObject; |
| |
| class PrototypeKey { |
| public: |
| PrototypeKey() { } |
| |
| PrototypeKey(JSObject* prototype, FunctionExecutable* executable, unsigned inlineCapacity, const ClassInfo* classInfo, JSGlobalObject* globalObject) |
| : m_prototype(prototype) |
| , m_executable(executable) |
| , m_inlineCapacity(inlineCapacity) |
| , m_classInfo(classInfo) |
| , m_globalObject(globalObject) |
| { |
| } |
| |
| PrototypeKey(WTF::HashTableDeletedValueType) |
| : m_inlineCapacity(1) |
| { |
| } |
| |
| JSObject* prototype() const { return m_prototype; } |
| FunctionExecutable* executable() const { return m_executable; } |
| unsigned inlineCapacity() const { return m_inlineCapacity; } |
| const ClassInfo* classInfo() const { return m_classInfo; } |
| JSGlobalObject* globalObject() const { return m_globalObject; } |
| |
| bool operator==(const PrototypeKey& other) const |
| { |
| return m_prototype == other.m_prototype |
| && m_executable == other.m_executable |
| && m_inlineCapacity == other.m_inlineCapacity |
| && m_classInfo == other.m_classInfo |
| && m_globalObject == other.m_globalObject; |
| } |
| |
| bool operator!=(const PrototypeKey& other) const { return !(*this == other); } |
| explicit operator bool() const { return *this != PrototypeKey(); } |
| bool isHashTableDeletedValue() const { return *this == PrototypeKey(WTF::HashTableDeletedValue); } |
| |
| unsigned hash() const |
| { |
| return WTF::IntHash<uintptr_t>::hash(bitwise_cast<uintptr_t>(m_prototype) ^ bitwise_cast<uintptr_t>(m_executable) ^ bitwise_cast<uintptr_t>(m_classInfo) ^ bitwise_cast<uintptr_t>(m_globalObject)) + m_inlineCapacity; |
| } |
| |
| private: |
| // WARNING: We require all of these default values to be zero. Otherwise, you'll need to add |
| // "static constexpr bool emptyValueIsZero = false;" to the HashTraits at the bottom of this file. |
| JSObject* m_prototype { nullptr }; |
| FunctionExecutable* m_executable { nullptr }; |
| unsigned m_inlineCapacity { 0 }; |
| const ClassInfo* m_classInfo { nullptr }; |
| JSGlobalObject* m_globalObject { nullptr }; |
| }; |
| |
| struct PrototypeKeyHash { |
| static unsigned hash(const PrototypeKey& key) { return key.hash(); } |
| static bool equal(const PrototypeKey& a, const PrototypeKey& b) { return a == b; } |
| static constexpr bool safeToCompareToEmptyOrDeleted = true; |
| }; |
| |
| } // namespace JSC |
| |
| namespace WTF { |
| |
| template<typename T> struct DefaultHash; |
| template<> struct DefaultHash<JSC::PrototypeKey> { |
| typedef JSC::PrototypeKeyHash Hash; |
| }; |
| |
| template<typename T> struct HashTraits; |
| template<> struct HashTraits<JSC::PrototypeKey> : SimpleClassHashTraits<JSC::PrototypeKey> { }; |
| |
| } // namespace WTF |
| |