webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 107 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/heap/VisitRaceKey.h b/Source/JavaScriptCore/heap/VisitRaceKey.h
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+++ b/Source/JavaScriptCore/heap/VisitRaceKey.h
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+/*
+ * Copyright (C) 2016 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)
+    {
+    }
+    
+    bool operator==(const VisitRaceKey& other) const
+    {
+        return m_cell == other.m_cell
+            && m_raceName == other.m_raceName;
+    }
+    
+    bool operator!=(const VisitRaceKey& other) const
+    {
+        return !(*this == other);
+    }
+    
+    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* 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 const bool safeToCompareToEmptyOrDeleted = true;
+};
+
+} // namespace JSC
+
+namespace WTF {
+
+template<typename T> struct DefaultHash;
+template<> struct DefaultHash<JSC::VisitRaceKey> {
+    typedef JSC::VisitRaceKeyHash Hash;
+};
+
+template<typename T> struct HashTraits;
+template<> struct HashTraits<JSC::VisitRaceKey> : SimpleClassHashTraits<JSC::VisitRaceKey> { };
+
+} // namespace WTF
+