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diff --git a/Source/JavaScriptCore/dfg/DFGJITCode.h b/Source/JavaScriptCore/dfg/DFGJITCode.h
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+/*
+ * Copyright (C) 2013-2015 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 DFGJITCode_h
+#define DFGJITCode_h
+
+#if ENABLE(DFG_JIT)
+
+#include "CodeBlock.h"
+#include "CompilationResult.h"
+#include "DFGCommonData.h"
+#include "DFGMinifiedGraph.h"
+#include "DFGOSREntry.h"
+#include "DFGOSRExit.h"
+#include "DFGVariableEventStream.h"
+#include "ExecutionCounter.h"
+#include "JITCode.h"
+#include <wtf/SegmentedVector.h>
+
+namespace JSC {
+
+class TrackedReferences;
+
+namespace DFG {
+
+class JITCompiler;
+
+class JITCode : public DirectJITCode {
+public:
+    JITCode();
+    virtual ~JITCode();
+    
+    virtual CommonData* dfgCommon() override;
+    virtual JITCode* dfg() override;
+    
+    OSREntryData* appendOSREntryData(unsigned bytecodeIndex, unsigned machineCodeOffset)
+    {
+        DFG::OSREntryData entry;
+        entry.m_bytecodeIndex = bytecodeIndex;
+        entry.m_machineCodeOffset = machineCodeOffset;
+        osrEntry.append(entry);
+        return &osrEntry.last();
+    }
+    
+    OSREntryData* osrEntryDataForBytecodeIndex(unsigned bytecodeIndex)
+    {
+        return tryBinarySearch<OSREntryData, unsigned>(
+            osrEntry, osrEntry.size(), bytecodeIndex,
+            getOSREntryDataBytecodeIndex);
+    }
+    
+    unsigned appendOSRExit(const OSRExit& exit)
+    {
+        unsigned result = osrExit.size();
+        osrExit.append(exit);
+        return result;
+    }
+    
+    OSRExit& lastOSRExit()
+    {
+        return osrExit.last();
+    }
+    
+    unsigned appendSpeculationRecovery(const SpeculationRecovery& recovery)
+    {
+        unsigned result = speculationRecovery.size();
+        speculationRecovery.append(recovery);
+        return result;
+    }
+    
+    void reconstruct(
+        CodeBlock*, CodeOrigin, unsigned streamIndex, Operands<ValueRecovery>& result);
+    
+    // This is only applicable if we're at a point where all values are spilled to the
+    // stack. Currently, it also has the restriction that the values must be in their
+    // bytecode-designated stack slots.
+    void reconstruct(
+        ExecState*, CodeBlock*, CodeOrigin, unsigned streamIndex, Operands<JSValue>& result);
+
+#if ENABLE(FTL_JIT)
+    // NB. All of these methods take CodeBlock* because they may want to use
+    // CodeBlock's logic about scaling thresholds. It should be a DFG CodeBlock.
+    
+    bool checkIfOptimizationThresholdReached(CodeBlock*);
+    void optimizeNextInvocation(CodeBlock*);
+    void dontOptimizeAnytimeSoon(CodeBlock*);
+    void optimizeAfterWarmUp(CodeBlock*);
+    void optimizeSoon(CodeBlock*);
+    void forceOptimizationSlowPathConcurrently(CodeBlock*);
+    void setOptimizationThresholdBasedOnCompilationResult(CodeBlock*, CompilationResult);
+#endif // ENABLE(FTL_JIT)
+    
+    void validateReferences(const TrackedReferences&) override;
+    
+    void shrinkToFit();
+
+    RegisterSet liveRegistersToPreserveAtExceptionHandlingCallSite(CodeBlock*, CallSiteIndex) override;
+#if ENABLE(FTL_JIT)
+    CodeBlock* osrEntryBlock() { return m_osrEntryBlock.get(); }
+    void setOSREntryBlock(VM& vm, const JSCell* owner, CodeBlock* osrEntryBlock) { m_osrEntryBlock.set(vm, owner, osrEntryBlock); }
+    void clearOSREntryBlock() { m_osrEntryBlock.clear(); }
+#endif
+
+    static ptrdiff_t commonDataOffset() { return OBJECT_OFFSETOF(JITCode, common); }
+
+    Optional<CodeOrigin> findPC(CodeBlock*, void* pc) override;
+    
+private:
+    friend class JITCompiler; // Allow JITCompiler to call setCodeRef().
+
+public:
+    CommonData common;
+    Vector<DFG::OSREntryData> osrEntry;
+    SegmentedVector<DFG::OSRExit, 8> osrExit;
+    Vector<DFG::SpeculationRecovery> speculationRecovery;
+    DFG::VariableEventStream variableEventStream;
+    DFG::MinifiedGraph minifiedDFG;
+#if ENABLE(FTL_JIT)
+    uint8_t nestedTriggerIsSet { 0 };
+    uint8_t neverExecutedEntry { 1 };
+    UpperTierExecutionCounter tierUpCounter;
+    WriteBarrier<CodeBlock> m_osrEntryBlock;
+    unsigned osrEntryRetry;
+    bool abandonOSREntry;
+#endif // ENABLE(FTL_JIT)
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGJITCode_h
+