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diff --git a/Source/JavaScriptCore/b3/air/AirInsertionSet.h b/Source/JavaScriptCore/b3/air/AirInsertionSet.h
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+++ b/Source/JavaScriptCore/b3/air/AirInsertionSet.h
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+/*
+ * Copyright (C) 2015-2017 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 "AirInst.h"
+#include <wtf/Insertion.h>
+#include <wtf/Vector.h>
+
+namespace JSC { namespace B3 { namespace Air {
+
+class BasicBlock;
+class Code;
+
+typedef WTF::Insertion<Inst> Insertion;
+
+class InsertionSet {
+public:
+    InsertionSet(Code& code)
+        : m_code(code)
+    {
+    }
+
+    Code& code() { return m_code; }
+
+    template<typename T>
+    void appendInsertion(T&& insertion)
+    {
+        m_insertions.append(std::forward<T>(insertion));
+    }
+
+    template<typename Inst>
+    void insertInst(size_t index, Inst&& inst)
+    {
+        appendInsertion(Insertion(index, std::forward<Inst>(inst)));
+    }
+
+    template <typename InstVector>
+    void insertInsts(size_t index, const InstVector& insts)
+    {
+        for (const Inst& inst : insts)
+            insertInst(index, inst);
+    }
+    void insertInsts(size_t index, Vector<Inst>&&);
+    
+    template<typename... Arguments>
+    void insert(size_t index, Arguments&&... arguments)
+    {
+        insertInst(index, Inst(std::forward<Arguments>(arguments)...));
+    }
+
+    void execute(BasicBlock*);
+
+private:
+    Code& m_code;
+    Vector<Insertion, 8> m_insertions;
+};
+
+} } } // namespace JSC::B3::Air
+
+#endif // ENABLE(B3_JIT)