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diff --git a/Source/JavaScriptCore/dfg/DFGOSRExit.h b/Source/JavaScriptCore/dfg/DFGOSRExit.h
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+/*
+ * Copyright (C) 2011 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 DFGOSRExit_h
+#define DFGOSRExit_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+#include "CodeOrigin.h"
+#include "DFGCommon.h"
+#include "DFGCorrectableJumpPoint.h"
+#include "DFGExitProfile.h"
+#include "DFGGPRInfo.h"
+#include "DFGOperands.h"
+#include "MacroAssembler.h"
+#include "ValueProfile.h"
+#include "ValueRecovery.h"
+#include <wtf/Vector.h>
+
+namespace JSC { namespace DFG {
+
+class SpeculativeJIT;
+
+// This enum describes the types of additional recovery that
+// may need be performed should a speculation check fail.
+enum SpeculationRecoveryType {
+    SpeculativeAdd,
+    BooleanSpeculationCheck
+};
+
+// === SpeculationRecovery ===
+//
+// This class provides additional information that may be associated with a
+// speculation check - for example 
+class SpeculationRecovery {
+public:
+    SpeculationRecovery(SpeculationRecoveryType type, GPRReg dest, GPRReg src)
+        : m_type(type)
+        , m_dest(dest)
+        , m_src(src)
+    {
+    }
+
+    SpeculationRecoveryType type() { return m_type; }
+    GPRReg dest() { return m_dest; }
+    GPRReg src() { return m_src; }
+
+private:
+    // Indicates the type of additional recovery to be performed.
+    SpeculationRecoveryType m_type;
+    // different recovery types may required different additional information here.
+    GPRReg m_dest;
+    GPRReg m_src;
+};
+
+// === OSRExit ===
+//
+// This structure describes how to exit the speculative path by
+// going into baseline code.
+struct OSRExit {
+    OSRExit(ExitKind, JSValueSource, ValueProfile*, MacroAssembler::Jump, SpeculativeJIT*, unsigned recoveryIndex = 0);
+    
+    MacroAssemblerCodeRef m_code;
+    
+    JSValueSource m_jsValueSource;
+    ValueProfile* m_valueProfile;
+    
+    CorrectableJumpPoint m_check;
+    NodeIndex m_nodeIndex;
+    CodeOrigin m_codeOrigin;
+    
+    unsigned m_recoveryIndex;
+    
+    ExitKind m_kind;
+    uint32_t m_count;
+    
+    // Convenient way of iterating over ValueRecoveries while being
+    // generic over argument versus variable.
+    int numberOfRecoveries() const { return m_arguments.size() + m_variables.size(); }
+    const ValueRecovery& valueRecovery(int index) const
+    {
+        if (index < (int)m_arguments.size())
+            return m_arguments[index];
+        return m_variables[index - m_arguments.size()];
+    }
+    ValueRecovery& valueRecoveryForOperand(int operand)
+    {
+        if (operandIsArgument(operand))
+            return m_arguments[operandToArgument(operand)];
+        return m_variables[operand];
+    }
+    bool isArgument(int index) const { return index < (int)m_arguments.size(); }
+    bool isVariable(int index) const { return !isArgument(index); }
+    int argumentForIndex(int index) const
+    {
+        return index;
+    }
+    int variableForIndex(int index) const
+    {
+        return index - m_arguments.size();
+    }
+    int operandForIndex(int index) const
+    {
+        if (index < (int)m_arguments.size())
+            return operandToArgument(index);
+        return index - m_arguments.size();
+    }
+    
+    bool considerAddingAsFrequentExitSite(CodeBlock* dfgCodeBlock, CodeBlock* profiledCodeBlock)
+    {
+        if (!m_count || !exitKindIsCountable(m_kind))
+            return false;
+        return considerAddingAsFrequentExitSiteSlow(dfgCodeBlock, profiledCodeBlock);
+    }
+    
+#ifndef NDEBUG
+    void dump(FILE* out) const;
+#endif
+    
+    Vector<ValueRecovery, 0> m_arguments;
+    Vector<ValueRecovery, 0> m_variables;
+    int m_lastSetOperand;
+
+private:
+    bool considerAddingAsFrequentExitSiteSlow(CodeBlock* dfgCodeBlock, CodeBlock* profiledCodeBlock);
+};
+
+#if DFG_ENABLE(VERBOSE_SPECULATION_FAILURE)
+struct SpeculationFailureDebugInfo {
+    CodeBlock* codeBlock;
+    NodeIndex nodeIndex;
+};
+#endif
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGOSRExit_h
+