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diff --git a/Source/JavaScriptCore/dfg/DFGCommonData.cpp b/Source/JavaScriptCore/dfg/DFGCommonData.cpp
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+++ b/Source/JavaScriptCore/dfg/DFGCommonData.cpp
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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. 
+ */
+
+#include "config.h"
+#include "DFGCommonData.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "CodeBlock.h"
+#include "DFGNode.h"
+#include "DFGPlan.h"
+#include "InlineCallFrame.h"
+#include "JSCInlines.h"
+#include "TrackedReferences.h"
+#include "VM.h"
+
+namespace JSC { namespace DFG {
+
+void CommonData::notifyCompilingStructureTransition(Plan& plan, CodeBlock* codeBlock, Node* node)
+{
+    plan.transitions.addLazily(
+        codeBlock,
+        node->origin.semantic.codeOriginOwner(),
+        node->transition()->previous,
+        node->transition()->next);
+}
+
+CallSiteIndex CommonData::addCodeOrigin(CodeOrigin codeOrigin)
+{
+    if (codeOrigins.isEmpty()
+        || codeOrigins.last() != codeOrigin)
+        codeOrigins.append(codeOrigin);
+    unsigned index = codeOrigins.size() - 1;
+    ASSERT(codeOrigins[index] == codeOrigin);
+    return CallSiteIndex(index);
+}
+
+CallSiteIndex CommonData::addUniqueCallSiteIndex(CodeOrigin codeOrigin)
+{
+    if (callSiteIndexFreeList.size())
+        return CallSiteIndex(callSiteIndexFreeList.takeAny());
+
+    codeOrigins.append(codeOrigin);
+    unsigned index = codeOrigins.size() - 1;
+    ASSERT(codeOrigins[index] == codeOrigin);
+    return CallSiteIndex(index);
+}
+
+CallSiteIndex CommonData::lastCallSite() const
+{
+    RELEASE_ASSERT(codeOrigins.size());
+    return CallSiteIndex(codeOrigins.size() - 1);
+}
+
+void CommonData::removeCallSiteIndex(CallSiteIndex callSite)
+{
+    RELEASE_ASSERT(callSite.bits() < codeOrigins.size());
+    callSiteIndexFreeList.add(callSite.bits());
+}
+
+void CommonData::shrinkToFit()
+{
+    codeOrigins.shrinkToFit();
+    weakReferences.shrinkToFit();
+    transitions.shrinkToFit();
+}
+
+bool CommonData::invalidate()
+{
+    if (!isStillValid)
+        return false;
+    for (unsigned i = jumpReplacements.size(); i--;)
+        jumpReplacements[i].fire();
+    isStillValid = false;
+    return true;
+}
+
+void CommonData::validateReferences(const TrackedReferences& trackedReferences)
+{
+    if (InlineCallFrameSet* set = inlineCallFrames.get()) {
+        for (InlineCallFrame* inlineCallFrame : *set) {
+            for (ValueRecovery& recovery : inlineCallFrame->arguments) {
+                if (recovery.isConstant())
+                    trackedReferences.check(recovery.constant());
+            }
+            
+            if (CodeBlock* baselineCodeBlock = inlineCallFrame->baselineCodeBlock.get())
+                trackedReferences.check(baselineCodeBlock);
+            
+            if (inlineCallFrame->calleeRecovery.isConstant())
+                trackedReferences.check(inlineCallFrame->calleeRecovery.constant());
+        }
+    }
+    
+    for (AdaptiveStructureWatchpoint* watchpoint : adaptiveStructureWatchpoints)
+        watchpoint->key().validateReferences(trackedReferences);
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+