JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / heap / GCThreadSharedData.h

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+/*
+ * Copyright (C) 2009, 2011 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. 
+ */
+
+#ifndef GCThreadSharedData_h
+#define GCThreadSharedData_h
+
+#include "ListableHandler.h"
+#include "MarkStack.h"
+#include "MarkedBlock.h"
+#include "UnconditionalFinalizer.h"
+#include "WeakReferenceHarvester.h"
+#include <wtf/HashSet.h>
+#include <wtf/TCSpinLock.h>
+#include <wtf/Threading.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class GCThread;
+class VM;
+class CopiedSpace;
+class CopyVisitor;
+
+enum GCPhase {
+    NoPhase,
+    Mark,
+    Copy,
+    Exit
+};
+
+class GCThreadSharedData {
+public:
+    GCThreadSharedData(VM*);
+    ~GCThreadSharedData();
+    
+    void reset();
+
+    void didStartMarking();
+    void didFinishMarking();
+    void didStartCopying();
+    void didFinishCopying();
+
+#if ENABLE(PARALLEL_GC)
+    void resetChildren();
+    size_t childVisitCount();
+    size_t childDupStrings();
+#endif
+    
+private:
+    friend class GCThread;
+    friend class SlotVisitor;
+    friend class CopyVisitor;
+
+    void getNextBlocksToCopy(size_t&, size_t&);
+    void startNextPhase(GCPhase);
+    void endCurrentPhase();
+
+    VM* m_vm;
+    CopiedSpace* m_copiedSpace;
+    
+    bool m_shouldHashCons;
+
+    Vector<GCThread*> m_gcThreads;
+
+    Mutex m_markingLock;
+    ThreadCondition m_markingCondition;
+    MarkStackArray m_sharedMarkStack;
+    unsigned m_numberOfActiveParallelMarkers;
+    bool m_parallelMarkersShouldExit;
+
+    Mutex m_opaqueRootsLock;
+    HashSet<void*> m_opaqueRoots;
+
+    SpinLock m_copyLock;
+    Vector<CopiedBlock*> m_blocksToCopy;
+    size_t m_copyIndex;
+    static const size_t s_blockFragmentLength = 32;
+
+    Mutex m_phaseLock;
+    ThreadCondition m_phaseCondition;
+    ThreadCondition m_activityCondition;
+    unsigned m_numberOfActiveGCThreads;
+    bool m_gcThreadsShouldWait;
+    GCPhase m_currentPhase;
+
+    ListableHandler<WeakReferenceHarvester>::List m_weakReferenceHarvesters;
+    ListableHandler<UnconditionalFinalizer>::List m_unconditionalFinalizers;
+};
+
+inline void GCThreadSharedData::getNextBlocksToCopy(size_t& start, size_t& end)
+{
+    SpinLockHolder locker(&m_copyLock);
+    start = m_copyIndex;
+    end = std::min(m_blocksToCopy.size(), m_copyIndex + s_blockFragmentLength);
+    m_copyIndex = end;
+}
+
+} // namespace JSC
+
+#endif