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diff --git a/Source/JavaScriptCore/runtime/InitializeThreading.cpp b/Source/JavaScriptCore/runtime/InitializeThreading.cpp
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+++ b/Source/JavaScriptCore/runtime/InitializeThreading.cpp
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+/*
+ * Copyright (C) 2008, 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. 
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "InitializeThreading.h"
+
+#include "ExecutableAllocator.h"
+#include "Heap.h"
+#include "HeapStatistics.h"
+#include "Options.h"
+#include "Identifier.h"
+#include "JSDateMath.h"
+#include "JSGlobalObject.h"
+#include "JSLock.h"
+#include "LLIntData.h"
+#include "StructureIDTable.h"
+#include "WriteBarrier.h"
+#include <mutex>
+#include <wtf/dtoa.h>
+#include <wtf/Threading.h>
+#include <wtf/dtoa/cached-powers.h>
+
+using namespace WTF;
+
+namespace JSC {
+
+void initializeThreading()
+{
+    static std::once_flag initializeThreadingOnceFlag;
+
+    std::call_once(initializeThreadingOnceFlag, []{
+        WTF::double_conversion::initialize();
+        WTF::initializeThreading();
+        Options::initialize();
+        if (Options::recordGCPauseTimes())
+            HeapStatistics::initialize();
+#if ENABLE(WRITE_BARRIER_PROFILING)
+        WriteBarrierCounters::initialize();
+#endif
+#if ENABLE(ASSEMBLER)
+        ExecutableAllocator::initializeAllocator();
+#endif
+        LLInt::initialize();
+#ifndef NDEBUG
+        DisallowGC::initialize();
+#endif
+        WTFThreadData& threadData = wtfThreadData();
+        threadData.setSavedLastStackTop(threadData.stack().origin());
+    });
+}
+
+} // namespace JSC