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diff --git a/Source/JavaScriptCore/runtime/LazyPropertyInlines.h b/Source/JavaScriptCore/runtime/LazyPropertyInlines.h
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+++ b/Source/JavaScriptCore/runtime/LazyPropertyInlines.h
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+/*
+ * Copyright (C) 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. 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 INC. 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.
+ */
+
+#pragma once
+
+#include "Heap.h"
+#include <wtf/StdLibExtras.h>
+
+namespace JSC {
+
+template<typename OwnerType, typename ElementType>
+void LazyProperty<OwnerType, ElementType>::Initializer::set(ElementType* value) const
+{
+    property.set(vm, owner, value);
+}
+
+template<typename OwnerType, typename ElementType>
+template<typename Func>
+void LazyProperty<OwnerType, ElementType>::initLater(const Func&)
+{
+    RELEASE_ASSERT(isStatelessLambda<Func>());
+    // Logically we just want to stuff the function pointer into m_pointer, but then we'd be sad
+    // because a function pointer is not guaranteed to be a multiple of anything. The tag bits
+    // may be used for things. We address this problem by indirecting through a global const
+    // variable. The "theFunc" variable is guaranteed to be native-aligned, i.e. at least a
+    // multiple of 4.
+    static const FuncType theFunc = callFunc<Func>;
+    m_pointer = lazyTag | bitwise_cast<uintptr_t>(&theFunc);
+}
+
+template<typename OwnerType, typename ElementType>
+void LazyProperty<OwnerType, ElementType>::setMayBeNull(VM& vm, const OwnerType* owner, ElementType* value)
+{
+    vm.heap.writeBarrier(owner, value);
+    m_pointer = bitwise_cast<uintptr_t>(value);
+    RELEASE_ASSERT(!(m_pointer & lazyTag));
+}
+
+template<typename OwnerType, typename ElementType>
+void LazyProperty<OwnerType, ElementType>::set(VM& vm, const OwnerType* owner, ElementType* value)
+{
+    RELEASE_ASSERT(value);
+    setMayBeNull(vm, owner, value);
+}
+
+template<typename OwnerType, typename ElementType>
+void LazyProperty<OwnerType, ElementType>::visit(SlotVisitor& visitor)
+{
+    if (m_pointer && !(m_pointer & lazyTag))
+        visitor.appendUnbarriered(bitwise_cast<ElementType*>(m_pointer));
+}
+
+template<typename OwnerType, typename ElementType>
+void LazyProperty<OwnerType, ElementType>::dump(PrintStream& out) const
+{
+    if (!m_pointer) {
+        out.print("<null>");
+        return;
+    }
+    if (m_pointer & lazyTag) {
+        out.print("Lazy:", RawPointer(bitwise_cast<void*>(m_pointer & ~lazyTag)));
+        if (m_pointer & initializingTag)
+            out.print("(Initializing)");
+        return;
+    }
+    out.print(RawPointer(bitwise_cast<void*>(m_pointer)));
+}
+
+template<typename OwnerType, typename ElementType>
+template<typename Func>
+ElementType* LazyProperty<OwnerType, ElementType>::callFunc(const Initializer& initializer)
+{
+    if (initializer.property.m_pointer & initializingTag)
+        return nullptr;
+    initializer.property.m_pointer |= initializingTag;
+    callStatelessLambda<void, Func>(initializer);
+    RELEASE_ASSERT(!(initializer.property.m_pointer & lazyTag));
+    RELEASE_ASSERT(!(initializer.property.m_pointer & initializingTag));
+    return bitwise_cast<ElementType*>(initializer.property.m_pointer);
+}
+
+} // namespace JSC