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diff --git a/Source/JavaScriptCore/b3/B3BasicBlock.cpp b/Source/JavaScriptCore/b3/B3BasicBlock.cpp
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+++ b/Source/JavaScriptCore/b3/B3BasicBlock.cpp
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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. 
+ */
+
+#include "config.h"
+#include "B3BasicBlock.h"
+
+#if ENABLE(B3_JIT)
+
+#include "B3BasicBlockInlines.h"
+#include "B3BasicBlockUtils.h"
+#include "B3Procedure.h"
+#include "B3ValueInlines.h"
+#include <wtf/ListDump.h>
+
+namespace JSC { namespace B3 {
+
+const char* const BasicBlock::dumpPrefix = "#";
+
+BasicBlock::BasicBlock(unsigned index, double frequency)
+    : m_index(index)
+    , m_frequency(frequency)
+{
+}
+
+BasicBlock::~BasicBlock()
+{
+}
+
+void BasicBlock::append(Value* value)
+{
+    m_values.append(value);
+    value->owner = this;
+}
+
+void BasicBlock::appendNonTerminal(Value* value)
+{
+    m_values.append(m_values.last());
+    m_values[m_values.size() - 1] = value;
+    value->owner = this;
+}
+
+void BasicBlock::removeLast(Procedure& proc)
+{
+    ASSERT(!m_values.isEmpty());
+    proc.deleteValue(m_values.takeLast());
+}
+
+void BasicBlock::replaceLast(Procedure& proc, Value* value)
+{
+    removeLast(proc);
+    append(value);
+}
+
+Value* BasicBlock::appendIntConstant(Procedure& proc, Origin origin, Type type, int64_t value)
+{
+    Value* result = proc.addIntConstant(origin, type, value);
+    append(result);
+    return result;
+}
+
+Value* BasicBlock::appendIntConstant(Procedure& proc, Value* likeValue, int64_t value)
+{
+    return appendIntConstant(proc, likeValue->origin(), likeValue->type(), value);
+}
+
+Value* BasicBlock::appendBoolConstant(Procedure& proc, Origin origin, bool value)
+{
+    return appendIntConstant(proc, origin, Int32, value ? 1 : 0);
+}
+
+void BasicBlock::clearSuccessors()
+{
+    m_successors.clear();
+}
+
+void BasicBlock::appendSuccessor(FrequentedBlock target)
+{
+    m_successors.append(target);
+}
+
+void BasicBlock::setSuccessors(FrequentedBlock target)
+{
+    m_successors.resize(1);
+    m_successors[0] = target;
+}
+
+void BasicBlock::setSuccessors(FrequentedBlock taken, FrequentedBlock notTaken)
+{
+    m_successors.resize(2);
+    m_successors[0] = taken;
+    m_successors[1] = notTaken;
+}
+
+bool BasicBlock::replaceSuccessor(BasicBlock* from, BasicBlock* to)
+{
+    bool result = false;
+    for (BasicBlock*& successor : successorBlocks()) {
+        if (successor == from) {
+            successor = to;
+            result = true;
+            
+            // Keep looping because a successor may be mentioned multiple times, like in a Switch.
+        }
+    }
+    return result;
+}
+
+bool BasicBlock::addPredecessor(BasicBlock* block)
+{
+    return B3::addPredecessor(this, block);
+}
+
+bool BasicBlock::removePredecessor(BasicBlock* block)
+{
+    return B3::removePredecessor(this, block);
+}
+
+bool BasicBlock::replacePredecessor(BasicBlock* from, BasicBlock* to)
+{
+    return B3::replacePredecessor(this, from, to);
+}
+
+void BasicBlock::updatePredecessorsAfter()
+{
+    B3::updatePredecessorsAfter(this);
+}
+
+void BasicBlock::dump(PrintStream& out) const
+{
+    out.print(dumpPrefix, m_index);
+}
+
+void BasicBlock::deepDump(const Procedure& proc, PrintStream& out) const
+{
+    out.print("BB", *this, ": ; frequency = ", m_frequency, "\n");
+    if (predecessors().size())
+        out.print("  Predecessors: ", pointerListDump(predecessors()), "\n");
+    for (Value* value : *this)
+        out.print("    ", B3::deepDump(proc, value), "\n");
+    if (!successors().isEmpty()) {
+        out.print("  Successors: ");
+        if (size())
+            last()->dumpSuccessors(this, out);
+        else
+            out.print(listDump(successors()));
+        out.print("\n");
+    }
+}
+
+Value* BasicBlock::appendNewControlValue(Procedure& proc, Opcode opcode, Origin origin)
+{
+    RELEASE_ASSERT(opcode == Oops || opcode == Return);
+    clearSuccessors();
+    return appendNew<Value>(proc, opcode, origin);
+}
+
+Value* BasicBlock::appendNewControlValue(Procedure& proc, Opcode opcode, Origin origin, Value* value)
+{
+    RELEASE_ASSERT(opcode == Return);
+    clearSuccessors();
+    return appendNew<Value>(proc, opcode, origin, value);
+}
+
+Value* BasicBlock::appendNewControlValue(Procedure& proc, Opcode opcode, Origin origin, const FrequentedBlock& target)
+{
+    RELEASE_ASSERT(opcode == Jump);
+    setSuccessors(target);
+    return appendNew<Value>(proc, opcode, origin);
+}
+
+Value* BasicBlock::appendNewControlValue(Procedure& proc, Opcode opcode, Origin origin, Value* predicate, const FrequentedBlock& taken, const FrequentedBlock& notTaken)
+{
+    RELEASE_ASSERT(opcode == Branch);
+    setSuccessors(taken, notTaken);
+    return appendNew<Value>(proc, opcode, origin, predicate);
+}
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)