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diff --git a/Source/JavaScriptCore/dfg/DFGNodeOrigin.h b/Source/JavaScriptCore/dfg/DFGNodeOrigin.h
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+++ b/Source/JavaScriptCore/dfg/DFGNodeOrigin.h
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+/*
+ * Copyright (C) 2014, 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 DFGNodeOrigin_h
+#define DFGNodeOrigin_h
+
+#if ENABLE(DFG_JIT)
+
+#include "CodeOrigin.h"
+#include "DFGClobbersExitState.h"
+
+namespace JSC { namespace DFG {
+
+class Graph;
+struct Node;
+
+struct NodeOrigin {
+    NodeOrigin() { }
+    
+    NodeOrigin(CodeOrigin semantic, CodeOrigin forExit, bool exitOK)
+        : semantic(semantic)
+        , forExit(forExit)
+        , exitOK(exitOK)
+    {
+    }
+
+    bool isSet() const
+    {
+        ASSERT(semantic.isSet() == forExit.isSet());
+        return semantic.isSet();
+    }
+    
+    NodeOrigin withSemantic(CodeOrigin semantic) const
+    {
+        if (!isSet())
+            return NodeOrigin();
+        
+        NodeOrigin result = *this;
+        if (semantic.isSet())
+            result.semantic = semantic;
+        return result;
+    }
+
+    NodeOrigin withForExitAndExitOK(CodeOrigin forExit, bool exitOK) const
+    {
+        if (!isSet())
+            return NodeOrigin();
+        
+        NodeOrigin result = *this;
+        if (forExit.isSet())
+            result.forExit = forExit;
+        result.exitOK = exitOK;
+        return result;
+    }
+
+    NodeOrigin withExitOK(bool value) const
+    {
+        NodeOrigin result = *this;
+        result.exitOK = value;
+        return result;
+    }
+
+    NodeOrigin withInvalidExit() const
+    {
+        return withExitOK(false);
+    }
+
+    NodeOrigin takeValidExit(bool& canExit) const
+    {
+        return withExitOK(exitOK & std::exchange(canExit, false));
+    }
+    
+    NodeOrigin forInsertingAfter(Graph& graph, Node* node) const
+    {
+        NodeOrigin result = *this;
+        if (exitOK && clobbersExitState(graph, node))
+            result.exitOK = false;
+        return result;
+    }
+
+    bool operator==(const NodeOrigin& other) const
+    {
+        return semantic == other.semantic
+            && forExit == other.forExit
+            && exitOK == other.exitOK;
+    }
+
+    bool operator!=(const NodeOrigin& other) const
+    {
+        return !(*this == other);
+    }
+
+    void dump(PrintStream&) const;
+
+    // Used for determining what bytecode this came from. This is important for
+    // debugging, exceptions, and even basic execution semantics.
+    CodeOrigin semantic;
+    // Code origin for where the node exits to.
+    CodeOrigin forExit;
+    // Whether or not it is legal to exit here.
+    bool exitOK { false };
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGNodeOrigin_h
+