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diff --git a/Source/JavaScriptCore/ftl/FTLSlowPathCall.h b/Source/JavaScriptCore/ftl/FTLSlowPathCall.h
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+++ b/Source/JavaScriptCore/ftl/FTLSlowPathCall.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 FTLSlowPathCall_h
+#define FTLSlowPathCall_h
+
+#if ENABLE(FTL_JIT)
+
+#include "CCallHelpers.h"
+#include "FTLSlowPathCallKey.h"
+#include "JITOperations.h"
+#include "StructureStubInfo.h"
+
+namespace JSC { namespace FTL {
+
+class State;
+
+class SlowPathCall {
+public:
+    SlowPathCall() { }
+    
+    SlowPathCall(MacroAssembler::Call call, const SlowPathCallKey& key)
+        : m_call(call)
+        , m_key(key)
+    {
+    }
+    
+    MacroAssembler::Call call() const { return m_call; }
+    SlowPathCallKey key() const { return m_key; }
+    
+private:
+    MacroAssembler::Call m_call;
+    SlowPathCallKey m_key;
+};
+
+// This will be an RAII thingy that will set up the necessary stack sizes and offsets and such.
+class SlowPathCallContext {
+public:
+    SlowPathCallContext(RegisterSet usedRegisters, CCallHelpers&, unsigned numArgs, GPRReg returnRegister);
+    ~SlowPathCallContext();
+
+    // NOTE: The call that this returns is already going to be linked by the JIT using addLinkTask(),
+    // so there is no need for you to link it yourself.
+    SlowPathCall makeCall(void* callTarget);
+
+private:
+    SlowPathCallKey keyWithTarget(void* callTarget) const;
+    
+    RegisterSet m_argumentRegisters;
+    RegisterSet m_callingConventionRegisters;
+    CCallHelpers& m_jit;
+    unsigned m_numArgs;
+    GPRReg m_returnRegister;
+    size_t m_offsetToSavingArea;
+    size_t m_stackBytesNeeded;
+    RegisterSet m_thunkSaveSet;
+    ptrdiff_t m_offset;
+};
+
+template<typename... ArgumentTypes>
+SlowPathCall callOperation(
+    const RegisterSet& usedRegisters, CCallHelpers& jit, CCallHelpers::JumpList* exceptionTarget,
+    FunctionPtr function, GPRReg resultGPR, ArgumentTypes... arguments)
+{
+    SlowPathCall call;
+    {
+        SlowPathCallContext context(usedRegisters, jit, sizeof...(ArgumentTypes) + 1, resultGPR);
+        jit.setupArgumentsWithExecState(arguments...);
+        call = context.makeCall(function.value());
+    }
+    if (exceptionTarget)
+        exceptionTarget->append(jit.emitExceptionCheck());
+    return call;
+}
+
+template<typename... ArgumentTypes>
+SlowPathCall callOperation(
+    const RegisterSet& usedRegisters, CCallHelpers& jit, CallSiteIndex callSiteIndex,
+    CCallHelpers::JumpList* exceptionTarget, FunctionPtr function, GPRReg resultGPR,
+    ArgumentTypes... arguments)
+{
+    if (callSiteIndex) {
+        jit.store32(
+            CCallHelpers::TrustedImm32(callSiteIndex.bits()),
+            CCallHelpers::tagFor(JSStack::ArgumentCount));
+    }
+    return callOperation(usedRegisters, jit, exceptionTarget, function, resultGPR, arguments...);
+}
+
+CallSiteIndex callSiteIndexForCodeOrigin(State&, CodeOrigin);
+
+template<typename... ArgumentTypes>
+SlowPathCall callOperation(
+    State& state, const RegisterSet& usedRegisters, CCallHelpers& jit, CodeOrigin codeOrigin,
+    CCallHelpers::JumpList* exceptionTarget, FunctionPtr function, GPRReg result, ArgumentTypes... arguments)
+{
+    return callOperation(
+        usedRegisters, jit, callSiteIndexForCodeOrigin(state, codeOrigin), exceptionTarget, function,
+        result, arguments...);
+}
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+
+#endif // FTLSlowPathCall_h
+