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diff --git a/Source/JavaScriptCore/disassembler/Disassembler.h b/Source/JavaScriptCore/disassembler/Disassembler.h
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+++ b/Source/JavaScriptCore/disassembler/Disassembler.h
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+/*
+ * Copyright (C) 2012, 2013, 2015 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 Disassembler_h
+#define Disassembler_h
+
+#include "JSExportMacros.h"
+#include <functional>
+#include <wtf/PrintStream.h>
+#include <wtf/text/CString.h>
+
+namespace JSC {
+
+class MacroAssemblerCodePtr;
+class MacroAssemblerCodeRef;
+
+enum InstructionSubsetHint { MacroAssemblerSubset, LLVMSubset };
+
+#if ENABLE(DISASSEMBLER)
+bool tryToDisassemble(const MacroAssemblerCodePtr&, size_t, const char* prefix, PrintStream&, InstructionSubsetHint = MacroAssemblerSubset);
+#else
+inline bool tryToDisassemble(const MacroAssemblerCodePtr&, size_t, const char*, PrintStream&, InstructionSubsetHint = MacroAssemblerSubset)
+{
+    return false;
+}
+#endif
+
+// Prints either the disassembly, or a line of text indicating that disassembly failed and
+// the range of machine code addresses.
+void disassemble(const MacroAssemblerCodePtr&, size_t, const char* prefix, PrintStream& out, InstructionSubsetHint = MacroAssemblerSubset);
+
+// Asynchronous disassembly. This happens on another thread, and calls the provided
+// callback when the disassembly is done.
+void disassembleAsynchronously(
+    const CString& header, const MacroAssemblerCodeRef&, size_t, const char* prefix,
+    InstructionSubsetHint = MacroAssemblerSubset);
+
+JS_EXPORT_PRIVATE void waitForAsynchronousDisassembly();
+
+} // namespace JSC
+
+#endif // Disassembler_h
+