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diff --git a/Source/JavaScriptCore/dfg/DFGArrayifySlowPathGenerator.h b/Source/JavaScriptCore/dfg/DFGArrayifySlowPathGenerator.h
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+/*
+ * Copyright (C) 2012, 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. 
+ */
+
+#ifndef DFGArrayifySlowPathGenerator_h
+#define DFGArrayifySlowPathGenerator_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGArrayMode.h"
+#include "DFGCommon.h"
+#include "DFGOSRExitJumpPlaceholder.h"
+#include "DFGOperations.h"
+#include "DFGSlowPathGenerator.h"
+#include "DFGSpeculativeJIT.h"
+#include <wtf/Vector.h>
+
+namespace JSC { namespace DFG {
+
+class ArrayifySlowPathGenerator : public JumpingSlowPathGenerator<MacroAssembler::JumpList> {
+public:
+    ArrayifySlowPathGenerator(
+        const MacroAssembler::JumpList& from, SpeculativeJIT* jit, Node* node, GPRReg baseGPR,
+        GPRReg propertyGPR, GPRReg tempGPR, GPRReg structureGPR)
+        : JumpingSlowPathGenerator<MacroAssembler::JumpList>(from, jit)
+        , m_op(node->op())
+        , m_arrayMode(node->arrayMode())
+        , m_structure(node->op() == ArrayifyToStructure ? node->structure() : 0)
+        , m_baseGPR(baseGPR)
+        , m_propertyGPR(propertyGPR)
+        , m_tempGPR(tempGPR)
+        , m_structureGPR(structureGPR)
+    {
+        ASSERT(m_op == Arrayify || m_op == ArrayifyToStructure);
+        
+        jit->silentSpillAllRegistersImpl(false, m_plans, InvalidGPRReg);
+        
+        if (m_propertyGPR != InvalidGPRReg) {
+            switch (m_arrayMode.type()) {
+            case Array::Int32:
+            case Array::Double:
+            case Array::Contiguous:
+                m_badPropertyJump = jit->speculationCheck(Uncountable, JSValueRegs(), 0);
+                break;
+            default:
+                break;
+            }
+        }
+        m_badIndexingTypeJump = jit->speculationCheck(BadIndexingType, JSValueSource::unboxedCell(m_baseGPR), 0);
+    }
+    
+protected:
+    virtual void generateInternal(SpeculativeJIT* jit) override
+    {
+        linkFrom(jit);
+        
+        ASSERT(m_op == Arrayify || m_op == ArrayifyToStructure);
+        
+        if (m_propertyGPR != InvalidGPRReg) {
+            switch (m_arrayMode.type()) {
+            case Array::Int32:
+            case Array::Double:
+            case Array::Contiguous:
+                m_badPropertyJump.fill(jit, jit->m_jit.branch32(
+                    MacroAssembler::AboveOrEqual, m_propertyGPR,
+                    MacroAssembler::TrustedImm32(MIN_SPARSE_ARRAY_INDEX)));
+                break;
+            default:
+                break;
+            }
+        }
+        
+        for (unsigned i = 0; i < m_plans.size(); ++i)
+            jit->silentSpill(m_plans[i]);
+        switch (m_arrayMode.type()) {
+        case Array::Int32:
+            jit->callOperation(operationEnsureInt32, m_tempGPR, m_baseGPR);
+            break;
+        case Array::Double:
+            jit->callOperation(operationEnsureDouble, m_tempGPR, m_baseGPR);
+            break;
+        case Array::Contiguous:
+            jit->callOperation(operationEnsureContiguous, m_tempGPR, m_baseGPR);
+            break;
+        case Array::ArrayStorage:
+        case Array::SlowPutArrayStorage:
+            jit->callOperation(operationEnsureArrayStorage, m_tempGPR, m_baseGPR);
+            break;
+        default:
+            CRASH();
+            break;
+        }
+        for (unsigned i = m_plans.size(); i--;)
+            jit->silentFill(m_plans[i], GPRInfo::regT0);
+        
+        if (m_op == ArrayifyToStructure) {
+            ASSERT(m_structure);
+            m_badIndexingTypeJump.fill(
+                jit, jit->m_jit.branchWeakStructure(MacroAssembler::NotEqual, MacroAssembler::Address(m_baseGPR, JSCell::structureIDOffset()), m_structure));
+        } else {
+            // Finally, check that we have the kind of array storage that we wanted to get.
+            // Note that this is a backwards speculation check, which will result in the 
+            // bytecode operation corresponding to this arrayification being reexecuted.
+            // That's fine, since arrayification is not user-visible.
+            jit->m_jit.load8(
+                MacroAssembler::Address(m_baseGPR, JSCell::indexingTypeOffset()), m_structureGPR);
+            m_badIndexingTypeJump.fill(
+                jit, jit->jumpSlowForUnwantedArrayMode(m_structureGPR, m_arrayMode));
+        }
+        
+        jumpTo(jit);
+    }
+    
+private:
+    NodeType m_op;
+    ArrayMode m_arrayMode;
+    Structure* m_structure;
+    GPRReg m_baseGPR;
+    GPRReg m_propertyGPR;
+    GPRReg m_tempGPR;
+    GPRReg m_structureGPR;
+    OSRExitJumpPlaceholder m_badPropertyJump;
+    OSRExitJumpPlaceholder m_badIndexingTypeJump;
+    Vector<SilentRegisterSavePlan, 2> m_plans;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGArrayifySlowPathGenerator_h
+