JavaScriptCore-1218.tar.gz

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

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+/*
+ * Copyright (C) 2012 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 CopyVisitor_h
+#define CopyVisitor_h
+
+#include "CopiedSpace.h"
+
+namespace JSC {
+
+class GCThreadSharedData;
+class JSCell;
+
+class CopyVisitor {
+public:
+    CopyVisitor(GCThreadSharedData&);
+
+    void copyFromShared();
+
+    void startCopying();
+    void doneCopying();
+
+    // Low-level API for copying, appropriate for cases where the object's heap references
+    // are discontiguous or if the object occurs frequently enough that you need to focus on
+    // performance. Use this with care as it is easy to shoot yourself in the foot.
+    bool checkIfShouldCopy(void*);
+    void* allocateNewSpace(size_t);
+    void didCopy(void*, size_t);
+
+private:
+    void* allocateNewSpaceSlow(size_t);
+    void visitCell(JSCell*);
+
+    GCThreadSharedData& m_shared;
+    CopiedAllocator m_copiedAllocator;
+};
+
+} // namespace JSC
+
+#endif