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diff --git a/Source/JavaScriptCore/bytecode/ExitKind.h b/Source/JavaScriptCore/bytecode/ExitKind.h
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+++ b/Source/JavaScriptCore/bytecode/ExitKind.h
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+/*
+ * Copyright (C) 2012-2015 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 ExitKind_h
+#define ExitKind_h
+
+namespace JSC {
+
+enum ExitKind : uint8_t {
+    ExitKindUnset,
+    BadType, // We exited because a type prediction was wrong.
+    BadCell, // We exited because we made an incorrect assumption about what cell we would see. Usually used for function checks.
+    BadIdent, // We exited because we made an incorrect assumption about what identifier we would see. Usually used for cached Id check in get_by_val.
+    BadExecutable, // We exited because we made an incorrect assumption about what executable we would see.
+    BadCache, // We exited because an inline cache was wrong.
+    BadConstantCache, // We exited because a cache on a weak constant (usually a prototype) was wrong.
+    BadIndexingType, // We exited because an indexing type was wrong.
+    Overflow, // We exited because of overflow.
+    NegativeZero, // We exited because we encountered negative zero.
+    Int52Overflow, // We exited because of an Int52 overflow.
+    StoreToHole, // We had a store to a hole.
+    LoadFromHole, // We had a load from a hole.
+    OutOfBounds, // We had an out-of-bounds access to an array.
+    InadequateCoverage, // We exited because we ended up in code that didn't have profiling coverage.
+    ArgumentsEscaped, // We exited because arguments escaped but we didn't expect them to.
+    ExoticObjectMode, // We exited because some exotic object that we were accessing was in an exotic mode (like Arguments with slow arguments).
+    NotStringObject, // We exited because we shouldn't have attempted to optimize string object access.
+    VarargsOverflow, // We exited because a varargs call passed more arguments than we expected.
+    TDZFailure, // We exited because we were in the TDZ and accessed the variable.
+    Uncountable, // We exited for none of the above reasons, and we should not count it. Most uses of this should be viewed as a FIXME.
+    UncountableInvalidation, // We exited because the code block was invalidated; this means that we've already counted the reasons why the code block was invalidated.
+    WatchdogTimerFired, // We exited because we need to service the watchdog timer.
+    DebuggerEvent // We exited because we need to service the debugger.
+};
+
+const char* exitKindToString(ExitKind);
+bool exitKindIsCountable(ExitKind);
+
+} // namespace JSC
+
+namespace WTF {
+
+class PrintStream;
+void printInternal(PrintStream&, JSC::ExitKind);
+
+} // namespace WTF
+
+#endif // ExitKind_h
+