JavaScriptCore-7600.1.4.9.tar.gz

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

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+/*
+ * Copyright (C) 2013 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 WriteBarrierBuffer_h
+#define WriteBarrierBuffer_h
+
+#include <wtf/FastMalloc.h>
+
+namespace JSC {
+
+class Heap;
+class JSCell;
+
+namespace FTL { class LowerDFGToLLVM; }
+
+class WriteBarrierBuffer {
+    friend class FTL::LowerDFGToLLVM;
+public:
+    WriteBarrierBuffer(unsigned capacity);
+    ~WriteBarrierBuffer();
+
+    void add(JSCell*);
+    void flush(Heap&);
+    void reset();
+
+    static ptrdiff_t currentIndexOffset()
+    {
+        return OBJECT_OFFSETOF(WriteBarrierBuffer, m_currentIndex);
+    }
+
+    static ptrdiff_t capacityOffset()
+    {
+        return OBJECT_OFFSETOF(WriteBarrierBuffer, m_capacity);
+    }
+
+    static ptrdiff_t bufferOffset()
+    {
+        return OBJECT_OFFSETOF(WriteBarrierBuffer, m_buffer);
+    }
+
+private:
+    unsigned m_currentIndex;
+    unsigned m_capacity;
+    JSCell** m_buffer;
+};
+
+} // namespace JSC
+
+#endif // WriteBarrierBuffer_h