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diff --git a/Source/JavaScriptCore/dfg/DFGPredictionInjectionPhase.cpp b/Source/JavaScriptCore/dfg/DFGPredictionInjectionPhase.cpp
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+++ b/Source/JavaScriptCore/dfg/DFGPredictionInjectionPhase.cpp
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+/*
+ * Copyright (C) 2013 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 "DFGPredictionInjectionPhase.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGBasicBlockInlines.h"
+#include "DFGGraph.h"
+#include "DFGPhase.h"
+#include "Operations.h"
+
+namespace JSC { namespace DFG {
+
+class PredictionInjectionPhase : public Phase {
+public:
+    PredictionInjectionPhase(Graph& graph)
+        : Phase(graph, "prediction injection")
+    {
+    }
+    
+    bool run()
+    {
+        ASSERT(m_graph.m_form == ThreadedCPS);
+        ASSERT(m_graph.m_unificationState == GloballyUnified);
+        
+        ASSERT(codeBlock()->numParameters() >= 1);
+        for (size_t arg = 0; arg < static_cast<size_t>(codeBlock()->numParameters()); ++arg) {
+            ValueProfile* profile = profiledBlock()->valueProfileForArgument(arg);
+            if (!profile)
+                continue;
+            
+            m_graph.m_arguments[arg]->variableAccessData()->predict(profile->computeUpdatedPrediction());
+            
+#if DFG_ENABLE(DEBUG_VERBOSE)
+            dataLog(
+                "Argument [", arg, "] prediction: ",
+                SpeculationDump(m_graph.m_arguments[arg]->variableAccessData()->prediction()), "\n");
+#endif
+        }
+        
+        for (BlockIndex blockIndex = 0; blockIndex < m_graph.m_blocks.size(); ++blockIndex) {
+            BasicBlock* block = m_graph.m_blocks[blockIndex].get();
+            if (!block)
+                continue;
+            if (!block->isOSRTarget)
+                continue;
+            if (block->bytecodeBegin != m_graph.m_osrEntryBytecodeIndex)
+                continue;
+            for (size_t i = 0; i < m_graph.m_mustHandleValues.size(); ++i) {
+                Node* node = block->variablesAtHead.operand(
+                    m_graph.m_mustHandleValues.operandForIndex(i));
+                if (!node)
+                    continue;
+                ASSERT(node->hasLocal());
+                node->variableAccessData()->predict(
+                    speculationFromValue(m_graph.m_mustHandleValues[i]));
+            }
+        }
+        
+        return true;
+    }
+};
+
+bool performPredictionInjection(Graph& graph)
+{
+    SamplingRegion samplingRegion("DFG Prediction Injection Phase");
+    return runPhase<PredictionInjectionPhase>(graph);
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+