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diff --git a/Source/JavaScriptCore/runtime/CatchScope.h b/Source/JavaScriptCore/runtime/CatchScope.h
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+/*
+ * Copyright (C) 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
+
+#include "ExceptionScope.h"
+
+namespace JSC {
+    
+#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
+    
+// If a function can clear JS exceptions, it should declare a CatchScope at the
+// top of the function (as early as possible) using the DECLARE_CATCH_SCOPE macro.
+// Declaring a CatchScope in a function means that the function intends to clear
+// pending exceptions before returning to its caller.
+    
+class CatchScope : public ExceptionScope {
+public:
+    JS_EXPORT_PRIVATE CatchScope(VM&, ExceptionEventLocation);
+    CatchScope(const CatchScope&) = delete;
+    CatchScope(CatchScope&&) = default;
+
+    JS_EXPORT_PRIVATE ~CatchScope();
+
+    void clearException() { m_vm.clearException(); }
+};
+
+#define DECLARE_CATCH_SCOPE(vm__) \
+    JSC::CatchScope((vm__), JSC::ExceptionEventLocation(__FUNCTION__, __FILE__, __LINE__))
+
+#else // not ENABLE(EXCEPTION_SCOPE_VERIFICATION)
+
+class CatchScope : public ExceptionScope {
+public:
+    ALWAYS_INLINE CatchScope(VM& vm)
+        : ExceptionScope(vm)
+    { }
+    CatchScope(const CatchScope&) = delete;
+    CatchScope(CatchScope&&) = default;
+
+    ALWAYS_INLINE void clearException() { m_vm.clearException(); }
+};
+
+#define DECLARE_CATCH_SCOPE(vm__) \
+    JSC::CatchScope((vm__))
+
+#endif // ENABLE(EXCEPTION_SCOPE_VERIFICATION)
+
+} // namespace JSC