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/*
* Copyright (C) 2016-2019 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. AND ITS CONTRIBUTORS ``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 ITS 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>
#include <wtf/PrintStream.h>
namespace JSC {
class JSCell;
class VisitRaceKey {
public:
VisitRaceKey() { }
VisitRaceKey(JSCell* cell, const char* raceName)
: m_cell(cell)
, m_raceName(raceName)
{
}
VisitRaceKey(WTF::HashTableDeletedValueType)
: m_raceName(m_deletedValueRaceName)
{
}
friend bool operator==(const VisitRaceKey&, const VisitRaceKey&) = default;
explicit operator bool() const
{
return *this != VisitRaceKey();
}
void dump(PrintStream& out) const;
JSCell* cell() const { return m_cell; }
const char* raceName() const { return m_raceName; }
bool isHashTableDeletedValue() const
{
return *this == VisitRaceKey(WTF::HashTableDeletedValue);
}
unsigned hash() const
{
return WTF::PtrHash<JSCell*>::hash(m_cell) ^ WTF::PtrHash<const char*>::hash(m_raceName);
}
private:
static const char* const m_deletedValueRaceName;
JSCell* m_cell { nullptr };
const char* m_raceName { nullptr };
};
struct VisitRaceKeyHash {
static unsigned hash(const VisitRaceKey& key) { return key.hash(); }
static bool equal(const VisitRaceKey& a, const VisitRaceKey& b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
} // namespace JSC
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::VisitRaceKey> : JSC::VisitRaceKeyHash { };
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::VisitRaceKey> : SimpleClassHashTraits<JSC::VisitRaceKey> { };
} // namespace WTF
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