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diff --git a/Source/JavaScriptCore/interpreter/CallFrameInlines.h b/Source/JavaScriptCore/interpreter/CallFrameInlines.h
new file mode 100644
index 000000000..3f430ec31
--- /dev/null
+++ b/Source/JavaScriptCore/interpreter/CallFrameInlines.h
@@ -0,0 +1,158 @@
+/*
+ * 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. 
+ */
+
+#ifndef CallFrameInlines_h
+#define CallFrameInlines_h
+
+#include "CallFrame.h"
+#include "CodeBlock.h"
+
+namespace JSC  {
+
+inline uint32_t CallFrame::Location::encode(CallFrame::Location::TypeTag tag, uint32_t bits)
+{
+#if USE(JSVALUE64)
+    ASSERT(!(bits & s_shiftedMask));
+    ASSERT(!(tag & ~s_mask));
+    return bits | (tag << s_shift);
+#else
+    ASSERT(!(tag & ~s_mask));
+    if (tag & CodeOriginIndexTag)
+        bits = (bits << s_shift);
+    ASSERT(!(bits & s_mask));
+    bits |= tag;
+    return bits;
+#endif
+}
+
+inline uint32_t CallFrame::Location::decode(uint32_t bits)
+{
+#if USE(JSVALUE64)
+    return bits & ~s_shiftedMask;
+#else
+    if (isCodeOriginIndex(bits))
+        return bits >> s_shift;
+    return bits & ~s_mask;
+#endif
+}
+
+#if USE(JSVALUE64)
+inline uint32_t CallFrame::Location::encodeAsBytecodeOffset(uint32_t bits)
+{
+    uint32_t encodedBits = encode(BytecodeLocationTag, bits);
+    ASSERT(isBytecodeLocation(encodedBits));
+    return encodedBits;
+}
+#else
+inline uint32_t CallFrame::Location::encodeAsBytecodeInstruction(Instruction* instruction)
+{
+    uint32_t encodedBits = encode(BytecodeLocationTag, reinterpret_cast<uint32_t>(instruction));
+    ASSERT(isBytecodeLocation(encodedBits));
+    return encodedBits;
+}
+#endif
+
+inline uint32_t CallFrame::Location::encodeAsCodeOriginIndex(uint32_t bits)
+{
+    uint32_t encodedBits = encode(CodeOriginIndexTag, bits);
+    ASSERT(isCodeOriginIndex(encodedBits));
+    return encodedBits;
+}
+
+inline bool CallFrame::Location::isBytecodeLocation(uint32_t bits)
+{
+    return !isCodeOriginIndex(bits);
+}
+
+inline bool CallFrame::Location::isCodeOriginIndex(uint32_t bits)
+{
+#if USE(JSVALUE64)
+    TypeTag tag = static_cast<TypeTag>(bits >> s_shift);
+    return !!(tag & CodeOriginIndexTag);
+#else
+    return !!(bits & CodeOriginIndexTag);
+#endif
+}
+
+inline bool CallFrame::hasLocationAsBytecodeOffset() const
+{
+    return Location::isBytecodeLocation(locationAsRawBits());
+}
+
+inline bool CallFrame::hasLocationAsCodeOriginIndex() const
+{
+    return Location::isCodeOriginIndex(locationAsRawBits());
+}
+
+inline unsigned CallFrame::locationAsRawBits() const
+{
+    return this[JSStack::ArgumentCount].tag();
+}
+
+inline void CallFrame::setLocationAsRawBits(unsigned bits)
+{
+    this[JSStack::ArgumentCount].tag() = static_cast<int32_t>(bits);
+}
+
+#if USE(JSVALUE64)
+inline unsigned CallFrame::locationAsBytecodeOffset() const
+{
+    ASSERT(hasLocationAsBytecodeOffset());
+    ASSERT(codeBlock());
+    return Location::decode(locationAsRawBits());
+}
+
+inline void CallFrame::setLocationAsBytecodeOffset(unsigned offset)
+{
+    ASSERT(codeBlock());
+    setLocationAsRawBits(Location::encodeAsBytecodeOffset(offset));
+    ASSERT(hasLocationAsBytecodeOffset());
+}
+#endif // USE(JSVALUE64)
+
+inline unsigned CallFrame::locationAsCodeOriginIndex() const
+{
+    ASSERT(hasLocationAsCodeOriginIndex());
+    ASSERT(codeBlock());
+    return Location::decode(locationAsRawBits());
+}
+
+inline bool CallFrame::hasActivation() const
+{
+    JSValue activation = uncheckedActivation();
+    return !!activation && activation.isCell();
+}
+
+inline JSValue CallFrame::uncheckedActivation() const
+{
+    CodeBlock* codeBlock = this->codeBlock();
+    RELEASE_ASSERT(codeBlock->needsActivation());
+    VirtualRegister activationRegister = codeBlock->activationRegister();
+    return registers()[activationRegister.offset()].jsValue();
+}
+
+} // namespace JSC
+
+#endif // CallFrameInlines_h