JavaScriptCore-1097.3.tar.gz

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

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+/*
+ * Copyright (C) 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. 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.
+ */
+
+#ifndef SlotVisitor_h
+#define SlotVisitor_h
+
+#include "CopiedSpace.h"
+#include "MarkStack.h"
+
+namespace JSC {
+
+class Heap;
+
+class SlotVisitor : public MarkStack {
+    friend class HeapRootVisitor;
+public:
+    SlotVisitor(MarkStackThreadSharedData&);
+
+    void donate()
+    {
+        ASSERT(m_isInParallelMode);
+        if (Options::numberOfGCMarkers == 1)
+            return;
+        
+        donateKnownParallel();
+    }
+    
+    void drain();
+    
+    void donateAndDrain()
+    {
+        donate();
+        drain();
+    }
+    
+    enum SharedDrainMode { SlaveDrain, MasterDrain };
+    void drainFromShared(SharedDrainMode);
+
+    void harvestWeakReferences();
+    void finalizeUnconditionalFinalizers();
+
+    void startCopying();
+    void copyAndAppend(void**, size_t, JSValue*, unsigned);
+    void doneCopying(); 
+        
+private:
+    void* allocateNewSpace(void*, size_t);
+
+    void donateSlow();
+    
+    void donateKnownParallel()
+    {
+        if (!m_stack.canDonateSomeCells())
+            return;
+        donateSlow();
+    }
+    
+    CopiedBlock* m_copyBlock;
+};
+
+inline SlotVisitor::SlotVisitor(MarkStackThreadSharedData& shared)
+    : MarkStack(shared)
+    , m_copyBlock(0)
+{
+}
+
+} // namespace JSC
+
+#endif // SlotVisitor_h