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diff --git a/Source/JavaScriptCore/wasm/WASMFunctionB3IRGenerator.h b/Source/JavaScriptCore/wasm/WASMFunctionB3IRGenerator.h
new file mode 100644
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+++ b/Source/JavaScriptCore/wasm/WASMFunctionB3IRGenerator.h
@@ -0,0 +1,394 @@
+/*
+ * 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.
+ */
+
+#ifndef WASMFunctionB3IRGenerator_h
+#define WASMFunctionB3IRGenerator_h
+
+#if ENABLE(WEBASSEMBLY) && ENABLE(FTL_JIT)
+
+#include "FTLAbbreviatedTypes.h"
+
+#define UNUSED 0
+
+namespace JSC {
+
+using FTL::LBasicBlock;
+using FTL::LValue;
+
+class WASMFunctionB3IRGenerator {
+public:
+    typedef LValue Expression;
+    typedef int Statement;
+    typedef Vector<LValue> ExpressionList;
+    struct MemoryAddress {
+        MemoryAddress(void*) { }
+        MemoryAddress(LValue index, uint32_t offset)
+            : index(index)
+            , offset(offset)
+        {
+        }
+        LValue index;
+        uint32_t offset;
+    };
+    typedef LBasicBlock JumpTarget;
+    enum class JumpCondition { Zero, NonZero };
+
+    void startFunction(const Vector<WASMType>& arguments, uint32_t numberOfI32LocalVariables, uint32_t numberOfF32LocalVariables, uint32_t numberOfF64LocalVariables)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(arguments);
+        UNUSED_PARAM(numberOfI32LocalVariables);
+        UNUSED_PARAM(numberOfF32LocalVariables);
+        UNUSED_PARAM(numberOfF64LocalVariables);
+    }
+
+    void endFunction()
+    {
+        // FIXME: Implement this method.
+    }
+
+    LValue buildSetLocal(WASMOpKind opKind, uint32_t localIndex, LValue value, WASMType type)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(opKind);
+        UNUSED_PARAM(localIndex);
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(type);
+        return UNUSED;
+    }
+
+    LValue buildSetGlobal(WASMOpKind opKind, uint32_t globalIndex, LValue value, WASMType type)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(opKind);
+        UNUSED_PARAM(globalIndex);
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(type);
+        return UNUSED;
+    }
+
+    void buildReturn(LValue value, WASMExpressionType returnType)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(returnType);
+    }
+
+    LValue buildImmediateI32(uint32_t immediate)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(immediate);
+        return UNUSED;
+    }
+
+    LValue buildImmediateF32(float immediate)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(immediate);
+        return UNUSED;
+    }
+
+    LValue buildImmediateF64(double immediate)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(immediate);
+        return UNUSED;
+    }
+
+    LValue buildGetLocal(uint32_t localIndex, WASMType type)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(localIndex);
+        UNUSED_PARAM(type);
+        return UNUSED;
+    }
+
+    LValue buildGetGlobal(uint32_t globalIndex, WASMType type)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(globalIndex);
+        UNUSED_PARAM(type);
+        return UNUSED;
+    }
+
+    LValue buildConvertType(LValue value, WASMExpressionType fromType, WASMExpressionType toType, WASMTypeConversion conversion)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(fromType);
+        UNUSED_PARAM(toType);
+        UNUSED_PARAM(conversion);
+        return UNUSED;
+    }
+
+    LValue buildLoad(const MemoryAddress& memoryAddress, WASMExpressionType expressionType, WASMMemoryType memoryType, MemoryAccessConversion conversion)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(memoryAddress);
+        UNUSED_PARAM(expressionType);
+        UNUSED_PARAM(memoryType);
+        UNUSED_PARAM(conversion);
+        return UNUSED;
+    }
+
+    LValue buildStore(WASMOpKind opKind, const MemoryAddress& memoryAddress, WASMExpressionType expressionType, WASMMemoryType memoryType, LValue value)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(opKind);
+        UNUSED_PARAM(memoryAddress);
+        UNUSED_PARAM(expressionType);
+        UNUSED_PARAM(memoryType);
+        UNUSED_PARAM(value);
+        return UNUSED;
+    }
+
+    LValue buildUnaryI32(LValue value, WASMOpExpressionI32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildUnaryF32(LValue value, WASMOpExpressionF32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildUnaryF64(LValue value, WASMOpExpressionF64 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildBinaryI32(LValue left, LValue right, WASMOpExpressionI32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildBinaryF32(LValue left, LValue right, WASMOpExpressionF32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildBinaryF64(LValue left, LValue right, WASMOpExpressionF64 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildRelationalI32(LValue left, LValue right, WASMOpExpressionI32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildRelationalF32(LValue left, LValue right, WASMOpExpressionI32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildRelationalF64(LValue left, LValue right, WASMOpExpressionI32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildMinOrMaxI32(LValue left, LValue right, WASMOpExpressionI32 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildMinOrMaxF64(LValue left, LValue right, WASMOpExpressionF64 op)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(left);
+        UNUSED_PARAM(right);
+        UNUSED_PARAM(op);
+        return UNUSED;
+    }
+
+    LValue buildCallInternal(uint32_t functionIndex, const Vector<LValue>& argumentList, const WASMSignature& signature, WASMExpressionType returnType)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(functionIndex);
+        UNUSED_PARAM(argumentList);
+        UNUSED_PARAM(signature);
+        UNUSED_PARAM(returnType);
+        return UNUSED;
+    }
+
+    LValue buildCallIndirect(uint32_t functionPointerTableIndex, LValue index, const Vector<LValue>& argumentList, const WASMSignature& signature, WASMExpressionType returnType)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(functionPointerTableIndex);
+        UNUSED_PARAM(index);
+        UNUSED_PARAM(argumentList);
+        UNUSED_PARAM(signature);
+        UNUSED_PARAM(returnType);
+        return UNUSED;
+    }
+
+    LValue buildCallImport(uint32_t functionImportIndex, const Vector<LValue>& argumentList, const WASMSignature& signature, WASMExpressionType returnType)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(functionImportIndex);
+        UNUSED_PARAM(argumentList);
+        UNUSED_PARAM(signature);
+        UNUSED_PARAM(returnType);
+        return UNUSED;
+    }
+
+    void appendExpressionList(Vector<LValue>& expressionList, LValue value)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(expressionList);
+        UNUSED_PARAM(value);
+    }
+
+    void discard(LValue)
+    {
+    }
+
+    void linkTarget(LBasicBlock target)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(target);
+    }
+
+    void jumpToTarget(LBasicBlock target)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(target);
+    }
+
+    void jumpToTargetIf(JumpCondition, LValue value, LBasicBlock target)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(target);
+    }
+
+    void startLoop()
+    {
+        // FIXME: Implement this method.
+    }
+
+    void endLoop()
+    {
+        // FIXME: Implement this method.
+    }
+
+    void startSwitch()
+    {
+        // FIXME: Implement this method.
+    }
+
+    void endSwitch()
+    {
+        // FIXME: Implement this method.
+    }
+
+    void startLabel()
+    {
+        // FIXME: Implement this method.
+    }
+
+    void endLabel()
+    {
+        // FIXME: Implement this method.
+    }
+
+    LBasicBlock breakTarget()
+    {
+        // FIXME: Implement this method.
+        return UNUSED;
+    }
+
+    LBasicBlock continueTarget()
+    {
+        // FIXME: Implement this method.
+        return UNUSED;
+    }
+
+    LBasicBlock breakLabelTarget(uint32_t labelIndex)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(labelIndex);
+        return UNUSED;
+    }
+
+    LBasicBlock continueLabelTarget(uint32_t labelIndex)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(labelIndex);
+        return UNUSED;
+    }
+
+    void buildSwitch(LValue value, const Vector<int64_t>& cases, const Vector<LBasicBlock>& targets, LBasicBlock defaultTarget)
+    {
+        // FIXME: Implement this method.
+        UNUSED_PARAM(value);
+        UNUSED_PARAM(cases);
+        UNUSED_PARAM(targets);
+        UNUSED_PARAM(defaultTarget);
+    }
+};
+
+} // namespace JSC
+
+#endif // ENABLE(WEBASSEMBLY)
+
+#endif // WASMFunctionB3IRGenerator_h