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diff --git a/Source/JavaScriptCore/b3/air/AirCCallSpecial.h b/Source/JavaScriptCore/b3/air/AirCCallSpecial.h
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+++ b/Source/JavaScriptCore/b3/air/AirCCallSpecial.h
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+/*
+ * Copyright (C) 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. 
+ */
+
+#pragma once
+
+#if ENABLE(B3_JIT)
+
+#include "AirSpecial.h"
+
+namespace JSC { namespace B3 { namespace Air {
+
+// Use this special for constructing a C call. Arg 0 is of course a Special arg that refers to the
+// CCallSpecial object. Arg 1 is the callee, and it can be an ImmPtr, a register, or an address. The
+// next three args - arg 2, arg 3, and arg 4 - hold the return value GPRs and FPR. The remaining args
+// are just the set of argument registers used by this call. For arguments that go to the stack, you
+// have to do the grunt work of doing those stack stores. In fact, the only reason why we specify the
+// argument registers as arguments to a call is so that the liveness analysis can see that they get
+// used here. It would be wrong to automagically report all argument registers as being used because
+// if we had a call that didn't pass them, then they'd appear to be live until some clobber point or
+// the prologue, whichever happened sooner.
+
+class CCallSpecial : public Special {
+public:
+    CCallSpecial();
+    ~CCallSpecial();
+
+    // You cannot use this register to pass arguments. It just so happens that this register is not
+    // used for arguments in the C calling convention. By the way, this is the only thing that causes
+    // this special to be specific to C calls.
+    static const GPRReg scratchRegister = GPRInfo::nonArgGPR0;
+
+protected:
+    void forEachArg(Inst&, const ScopedLambda<Inst::EachArgCallback>&) override;
+    bool isValid(Inst&) override;
+    bool admitsStack(Inst&, unsigned argIndex) override;
+    void reportUsedRegisters(Inst&, const RegisterSet&) override;
+    CCallHelpers::Jump generate(Inst&, CCallHelpers&, GenerationContext&) override;
+    RegisterSet extraEarlyClobberedRegs(Inst&) override;
+    RegisterSet extraClobberedRegs(Inst&) override;
+
+    void dumpImpl(PrintStream&) const override;
+    void deepDumpImpl(PrintStream&) const override;
+
+private:
+    static const unsigned specialArgOffset = 0;
+    static const unsigned numSpecialArgs = 1;
+    static const unsigned calleeArgOffset = numSpecialArgs;
+    static const unsigned numCalleeArgs = 1;
+    static const unsigned returnGPArgOffset = numSpecialArgs + numCalleeArgs;
+    static const unsigned numReturnGPArgs = 2;
+    static const unsigned returnFPArgOffset = numSpecialArgs + numCalleeArgs + numReturnGPArgs;
+    static const unsigned numReturnFPArgs = 1;
+    static const unsigned argArgOffset =
+        numSpecialArgs + numCalleeArgs + numReturnGPArgs + numReturnFPArgs;
+    
+    RegisterSet m_clobberedRegs;
+    RegisterSet m_emptyRegs;
+};
+
+} } } // namespace JSC::B3::Air
+
+#endif // ENABLE(B3_JIT)