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diff --git a/Source/JavaScriptCore/b3/air/AirBasicBlock.h b/Source/JavaScriptCore/b3/air/AirBasicBlock.h
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+++ b/Source/JavaScriptCore/b3/air/AirBasicBlock.h
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+/*
+ * Copyright (C) 2015-2016 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 "AirFrequentedBlock.h"
+#include "AirInst.h"
+#include "B3SuccessorCollection.h"
+#include <wtf/FastMalloc.h>
+#include <wtf/Noncopyable.h>
+
+namespace JSC { namespace B3 { namespace Air {
+
+class BlockInsertionSet;
+class Code;
+class InsertionSet;
+
+class BasicBlock {
+    WTF_MAKE_NONCOPYABLE(BasicBlock);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static const char* const dumpPrefix;
+
+    typedef Vector<Inst> InstList;
+    typedef Vector<BasicBlock*, 2> PredecessorList;
+    typedef Vector<FrequentedBlock, 2> SuccessorList;
+
+    unsigned index() const { return m_index; }
+
+    // This method is exposed for phases that mess with the layout of basic blocks. Currently that means just
+    // optimizeBlockOrder().
+    void setIndex(unsigned index) { m_index = index; }
+    
+    unsigned size() const { return m_insts.size(); }
+    InstList::iterator begin() { return m_insts.begin(); }
+    InstList::iterator end() { return m_insts.end(); }
+    InstList::const_iterator begin() const { return m_insts.begin(); }
+    InstList::const_iterator end() const { return m_insts.end(); }
+
+    const Inst& at(unsigned index) const { return m_insts[index]; }
+    Inst& at(unsigned index) { return m_insts[index]; }
+
+    Inst* get(unsigned index)
+    {
+        return index < size() ? &at(index) : nullptr;
+    }
+
+    const Inst& last() const { return m_insts.last(); }
+    Inst& last() { return m_insts.last(); }
+
+    void resize(unsigned size) { m_insts.resize(size); }
+
+    const InstList& insts() const { return m_insts; }
+    InstList& insts() { return m_insts; }
+
+    template<typename Inst>
+    Inst& appendInst(Inst&& inst)
+    {
+        m_insts.append(std::forward<Inst>(inst));
+        return m_insts.last();
+    }
+
+    template<typename... Arguments>
+    Inst& append(Arguments&&... arguments)
+    {
+        m_insts.append(Inst(std::forward<Arguments>(arguments)...));
+        return m_insts.last();
+    }
+
+    // The "0" case is the case to which the branch jumps, so the "then" case. The "1" case is the
+    // "else" case, and is used to represent the fall-through of a conditional branch.
+    unsigned numSuccessors() const { return m_successors.size(); }
+    FrequentedBlock successor(unsigned index) const { return m_successors[index]; }
+    FrequentedBlock& successor(unsigned index) { return m_successors[index]; }
+    const SuccessorList& successors() const { return m_successors; }
+    SuccessorList& successors() { return m_successors; }
+
+    BasicBlock* successorBlock(unsigned index) const { return successor(index).block(); }
+    BasicBlock*& successorBlock(unsigned index) { return successor(index).block(); }
+    SuccessorCollection<BasicBlock, SuccessorList> successorBlocks()
+    {
+        return SuccessorCollection<BasicBlock, SuccessorList>(m_successors);
+    }
+    SuccessorCollection<const BasicBlock, const SuccessorList> successorBlocks() const
+    {
+        return SuccessorCollection<const BasicBlock, const SuccessorList>(m_successors);
+    }
+
+    unsigned numPredecessors() const { return m_predecessors.size(); }
+    BasicBlock* predecessor(unsigned index) const { return m_predecessors[index]; }
+    BasicBlock*& predecessor(unsigned index) { return m_predecessors[index]; }
+    const PredecessorList& predecessors() const { return m_predecessors; }
+    PredecessorList& predecessors() { return m_predecessors; }
+
+    bool addPredecessor(BasicBlock*);
+    bool removePredecessor(BasicBlock*);
+    bool replacePredecessor(BasicBlock* from, BasicBlock* to);
+    bool containsPredecessor(BasicBlock* predecessor) const { return m_predecessors.contains(predecessor); }
+
+    double frequency() const { return m_frequency; }
+
+    void dump(PrintStream&) const;
+    void deepDump(PrintStream&) const;
+
+    void dumpHeader(PrintStream&) const;
+    void dumpFooter(PrintStream&) const;
+
+private:
+    friend class BlockInsertionSet;
+    friend class Code;
+    friend class InsertionSet;
+    
+    BasicBlock(unsigned index, double frequency);
+
+    unsigned m_index;
+    InstList m_insts;
+    SuccessorList m_successors;
+    PredecessorList m_predecessors;
+    double m_frequency;
+};
+
+class DeepBasicBlockDump {
+public:
+    DeepBasicBlockDump(const BasicBlock* block)
+        : m_block(block)
+    {
+    }
+
+    void dump(PrintStream& out) const
+    {
+        if (m_block)
+            m_block->deepDump(out);
+        else
+            out.print("<null>");
+    }
+
+private:
+    const BasicBlock* m_block;
+};
+
+inline DeepBasicBlockDump deepDump(const BasicBlock* block)
+{
+    return DeepBasicBlockDump(block);
+}
+
+} } } // namespace JSC::B3::Air
+
+#endif // ENABLE(B3_JIT)