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diff --git a/Source/JavaScriptCore/b3/B3Compilation.h b/Source/JavaScriptCore/b3/B3Compilation.h
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+++ b/Source/JavaScriptCore/b3/B3Compilation.h
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+/*
+ * Copyright (C) 2015-2016 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. 
+ */
+
+#pragma once
+
+#if ENABLE(B3_JIT)
+
+#include "MacroAssemblerCodeRef.h"
+#include <wtf/FastMalloc.h>
+#include <wtf/Noncopyable.h>
+
+namespace JSC {
+
+class VM;
+
+namespace B3 {
+
+class OpaqueByproducts;
+class Procedure;
+
+// This class is a way to keep the result of a B3 compilation alive
+// and runnable.
+
+class Compilation {
+    WTF_MAKE_NONCOPYABLE(Compilation);
+    WTF_MAKE_FAST_ALLOCATED;
+
+public:
+    JS_EXPORT_PRIVATE Compilation(MacroAssemblerCodeRef, std::unique_ptr<OpaqueByproducts>);
+    JS_EXPORT_PRIVATE Compilation(Compilation&&);
+    JS_EXPORT_PRIVATE ~Compilation();
+
+    MacroAssemblerCodePtr code() const { return m_codeRef.code(); }
+    MacroAssemblerCodeRef codeRef() const { return m_codeRef; }
+    
+    CString disassembly() const { return m_codeRef.disassembly(); }
+
+private:
+    MacroAssemblerCodeRef m_codeRef;
+    std::unique_ptr<OpaqueByproducts> m_byproducts;
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)