| /* |
| * Copyright (C) 2015 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(DFG_JIT) |
| |
| #include "InferredType.h" |
| #include <wtf/HashMap.h> |
| |
| namespace JSC { namespace DFG { |
| |
| // This documents the DFG's expectation for an InferredType: specifically, that we want it to have a live |
| // InferredType object and that this object has the type that we originally saw. |
| |
| class DesiredInferredType { |
| public: |
| DesiredInferredType() |
| : m_object(nullptr) |
| { |
| } |
| |
| DesiredInferredType(InferredType* object, const InferredType::Descriptor& expected) |
| : m_object(object) |
| , m_expected(expected) |
| { |
| } |
| |
| DesiredInferredType(WTF::HashTableDeletedValueType) |
| : m_object(nullptr) |
| , m_expected(InferredType::Top) |
| { |
| } |
| |
| explicit operator bool() const { return m_object && m_expected; } |
| |
| InferredType* object() const { return m_object; } |
| InferredType::Descriptor expected() const { return m_expected; } |
| |
| bool isStillValid() const |
| { |
| return m_object->canWatch(m_expected); |
| } |
| |
| void add(Watchpoint* watchpoint) const |
| { |
| m_object->addWatchpoint(watchpoint); |
| } |
| |
| bool operator==(const DesiredInferredType& other) const |
| { |
| return m_object == other.m_object |
| && m_expected == other.m_expected; |
| } |
| |
| bool operator!=(const DesiredInferredType& other) const |
| { |
| return !(*this == other); |
| } |
| |
| bool isHashTableDeletedValue() const |
| { |
| return !m_object && m_expected == InferredType::Top; |
| } |
| |
| unsigned hash() const |
| { |
| return WTF::PtrHash<InferredType*>::hash(m_object) + m_expected.hash() * 7; |
| } |
| |
| void dumpInContext(PrintStream& out, DumpContext* context) const |
| { |
| out.print(inContext(m_expected, context), " for ", RawPointer(m_object)); |
| } |
| |
| void dump(PrintStream& out) const |
| { |
| dumpInContext(out, nullptr); |
| } |
| |
| private: |
| InferredType* m_object; |
| InferredType::Descriptor m_expected; |
| }; |
| |
| struct DesiredInferredTypeHash { |
| static unsigned hash(const DesiredInferredType& key) { return key.hash(); } |
| static bool equal(const DesiredInferredType& a, const DesiredInferredType& b) { return a == b; } |
| static const bool safeToCompareToEmptyOrDeleted = true; |
| }; |
| |
| } } // namespace JSC::DFG |
| |
| namespace WTF { |
| |
| template<typename T> struct DefaultHash; |
| template<> struct DefaultHash<JSC::DFG::DesiredInferredType> { |
| typedef JSC::DFG::DesiredInferredTypeHash Hash; |
| }; |
| |
| template<typename T> struct HashTraits; |
| template<> struct HashTraits<JSC::DFG::DesiredInferredType> : SimpleClassHashTraits<JSC::DFG::DesiredInferredType> { }; |
| |
| } // namespace WTF |
| |
| #endif // ENABLE(DFG_JIT) |