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diff --git a/Source/JavaScriptCore/builtins/BuiltinNames.h b/Source/JavaScriptCore/builtins/BuiltinNames.h
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+++ b/Source/JavaScriptCore/builtins/BuiltinNames.h
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+/*
+ * Copyright (C) 2014, 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
+
+#include "BuiltinUtils.h"
+#include "BytecodeIntrinsicRegistry.h"
+#include "CommonIdentifiers.h"
+#include "JSCBuiltins.h"
+
+namespace JSC {
+
+#define JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(macro) \
+    JSC_COMMON_BYTECODE_INTRINSIC_FUNCTIONS_EACH_NAME(macro) \
+    JSC_COMMON_BYTECODE_INTRINSIC_CONSTANTS_EACH_NAME(macro) \
+    macro(arrayIteratorNextIndex) \
+    macro(arrayIterationKind) \
+    macro(arrayIteratorNext) \
+    macro(arrayIteratorIsDone) \
+    macro(arrayIteratorKind) \
+    macro(charCodeAt) \
+    macro(isView) \
+    macro(iteratedObject) \
+    macro(iteratedString) \
+    macro(stringIteratorNextIndex) \
+    macro(promise) \
+    macro(fulfillmentHandler) \
+    macro(rejectionHandler) \
+    macro(index) \
+    macro(deferred) \
+    macro(countdownHolder) \
+    macro(Object) \
+    macro(ownEnumerablePropertyKeys) \
+    macro(Number) \
+    macro(Array) \
+    macro(ArrayBuffer) \
+    macro(String) \
+    macro(RegExp) \
+    macro(Map) \
+    macro(Promise) \
+    macro(Reflect) \
+    macro(InternalPromise) \
+    macro(abs) \
+    macro(floor) \
+    macro(trunc) \
+    macro(create) \
+    macro(defineProperty) \
+    macro(getPrototypeOf) \
+    macro(getOwnPropertyDescriptor) \
+    macro(getOwnPropertyNames) \
+    macro(ownKeys) \
+    macro(Error) \
+    macro(RangeError) \
+    macro(TypeError) \
+    macro(typedArrayLength) \
+    macro(typedArraySort) \
+    macro(typedArrayGetOriginalConstructor) \
+    macro(typedArraySubarrayCreate) \
+    macro(BuiltinLog) \
+    macro(homeObject) \
+    macro(getTemplateObject) \
+    macro(templateRegistryKey) \
+    macro(enqueueJob) \
+    macro(promiseState) \
+    macro(promiseReactions) \
+    macro(promiseResult) \
+    macro(onFulfilled) \
+    macro(onRejected) \
+    macro(push) \
+    macro(repeatCharacter) \
+    macro(capabilities) \
+    macro(starDefault) \
+    macro(InspectorInstrumentation) \
+    macro(get) \
+    macro(set) \
+    macro(shift) \
+    macro(allocateTypedArray) \
+    macro(Int8Array) \
+    macro(Int16Array) \
+    macro(Int32Array) \
+    macro(Uint8Array) \
+    macro(Uint8ClampedArray) \
+    macro(Uint16Array) \
+    macro(Uint32Array) \
+    macro(Float32Array) \
+    macro(Float64Array) \
+    macro(exec) \
+    macro(generator) \
+    macro(generatorNext) \
+    macro(generatorState) \
+    macro(generatorFrame) \
+    macro(generatorValue) \
+    macro(generatorThis) \
+    macro(generatorResumeMode) \
+    macro(Collator) \
+    macro(DateTimeFormat) \
+    macro(NumberFormat) \
+    macro(intlSubstituteValue) \
+    macro(thisTimeValue) \
+    macro(thisNumberValue) \
+    macro(newTargetLocal) \
+    macro(derivedConstructor) \
+    macro(isTypedArrayView) \
+    macro(isBoundFunction) \
+    macro(hasInstanceBoundFunction) \
+    macro(instanceOf) \
+    macro(isArraySlow) \
+    macro(isArrayConstructor) \
+    macro(isConstructor) \
+    macro(isDerivedConstructor) \
+    macro(concatMemcpy) \
+    macro(appendMemcpy) \
+    macro(predictFinalLengthFromArgumunts) \
+    macro(print) \
+    macro(regExpCreate) \
+    macro(SetIterator) \
+    macro(setIteratorNext) \
+    macro(replaceUsingRegExp) \
+    macro(replaceUsingStringSearch) \
+    macro(MapIterator) \
+    macro(mapIteratorNext) \
+    macro(regExpBuiltinExec) \
+    macro(regExpMatchFast) \
+    macro(regExpProtoFlagsGetter) \
+    macro(regExpProtoGlobalGetter) \
+    macro(regExpProtoIgnoreCaseGetter) \
+    macro(regExpProtoMultilineGetter) \
+    macro(regExpProtoSourceGetter) \
+    macro(regExpProtoStickyGetter) \
+    macro(regExpProtoUnicodeGetter) \
+    macro(regExpPrototypeSymbolReplace) \
+    macro(regExpReplaceFast) \
+    macro(regExpSearchFast) \
+    macro(regExpSplitFast) \
+    macro(regExpTestFast) \
+    macro(stringIncludesInternal) \
+    macro(stringSplitFast) \
+    macro(stringSubstrInternal) \
+    macro(makeBoundFunction) \
+    macro(hasOwnLengthProperty) \
+    macro(importModule) \
+    macro(WebAssembly) \
+    macro(Module) \
+    macro(Instance) \
+    macro(Memory) \
+    macro(Table) \
+    macro(CompileError) \
+    macro(LinkError) \
+    macro(RuntimeError) \
+
+
+#define INITIALIZE_PRIVATE_TO_PUBLIC_ENTRY(name) m_privateToPublicMap.add(m_##name##PrivateName.impl(), &m_##name);
+#define INITIALIZE_PUBLIC_TO_PRIVATE_ENTRY(name) m_publicToPrivateMap.add(m_##name.impl(), &m_##name##PrivateName);
+
+// We commandeer the publicToPrivateMap to allow us to convert private symbol names into the appropriate symbol.
+// e.g. @iteratorSymbol points to Symbol.iterator in this map rather than to a an actual private name.
+// FIXME: This is a weird hack and we shouldn't need to do this.
+#define INITIALIZE_SYMBOL_PUBLIC_TO_PRIVATE_ENTRY(name) m_publicToPrivateMap.add(m_##name##SymbolPrivateIdentifier.impl(), &m_##name##Symbol);
+
+class BuiltinNames {
+    WTF_MAKE_NONCOPYABLE(BuiltinNames); WTF_MAKE_FAST_ALLOCATED;
+    
+public:
+    // We treat the dollarVM name as a special case below for $vm (because CommonIdentifiers does not
+    // yet support the $ character).
+
+    BuiltinNames(VM* vm, CommonIdentifiers* commonIdentifiers)
+        : m_emptyIdentifier(commonIdentifiers->emptyIdentifier)
+        JSC_FOREACH_BUILTIN_FUNCTION_NAME(INITIALIZE_BUILTIN_NAMES)
+        JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(INITIALIZE_BUILTIN_NAMES)
+        JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_BUILTIN_SYMBOLS)
+        , m_dollarVMName(Identifier::fromString(vm, "$vm"))
+        , m_dollarVMPrivateName(Identifier::fromUid(PrivateName(PrivateName::Description, ASCIILiteral("PrivateSymbol.$vm"))))
+    {
+        JSC_FOREACH_BUILTIN_FUNCTION_NAME(INITIALIZE_PRIVATE_TO_PUBLIC_ENTRY)
+        JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(INITIALIZE_PRIVATE_TO_PUBLIC_ENTRY)
+        JSC_FOREACH_BUILTIN_FUNCTION_NAME(INITIALIZE_PUBLIC_TO_PRIVATE_ENTRY)
+        JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(INITIALIZE_PUBLIC_TO_PRIVATE_ENTRY)
+        JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_SYMBOL_PUBLIC_TO_PRIVATE_ENTRY)
+        m_privateToPublicMap.add(m_dollarVMPrivateName.impl(), &m_dollarVMName);
+        m_publicToPrivateMap.add(m_dollarVMName.impl(), &m_dollarVMPrivateName);
+    }
+
+    bool isPrivateName(SymbolImpl& uid) const;
+    bool isPrivateName(UniquedStringImpl& uid) const;
+    bool isPrivateName(const Identifier&) const;
+    const Identifier* lookUpPrivateName(const Identifier&) const;
+    const Identifier& lookUpPublicName(const Identifier&) const;
+    
+    void appendExternalName(const Identifier& publicName, const Identifier& privateName);
+
+    JSC_FOREACH_BUILTIN_FUNCTION_NAME(DECLARE_BUILTIN_IDENTIFIER_ACCESSOR)
+    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(DECLARE_BUILTIN_IDENTIFIER_ACCESSOR)
+    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(DECLARE_BUILTIN_SYMBOL_ACCESSOR)
+    const JSC::Identifier& dollarVMPublicName() const { return m_dollarVMName; }
+    const JSC::Identifier& dollarVMPrivateName() const { return m_dollarVMPrivateName; }
+
+private:
+    Identifier m_emptyIdentifier;
+    JSC_FOREACH_BUILTIN_FUNCTION_NAME(DECLARE_BUILTIN_NAMES)
+    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(DECLARE_BUILTIN_NAMES)
+    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(DECLARE_BUILTIN_SYMBOLS)
+    const JSC::Identifier m_dollarVMName;
+    const JSC::Identifier m_dollarVMPrivateName;
+    typedef HashMap<RefPtr<UniquedStringImpl>, const Identifier*, IdentifierRepHash> BuiltinNamesMap;
+    BuiltinNamesMap m_publicToPrivateMap;
+    BuiltinNamesMap m_privateToPublicMap;
+};
+
+inline bool BuiltinNames::isPrivateName(SymbolImpl& uid) const
+{
+    return m_privateToPublicMap.contains(&uid);
+}
+
+inline bool BuiltinNames::isPrivateName(UniquedStringImpl& uid) const
+{
+    if (!uid.isSymbol())
+        return false;
+    return m_privateToPublicMap.contains(&uid);
+}
+
+inline bool BuiltinNames::isPrivateName(const Identifier& ident) const
+{
+    if (ident.isNull())
+        return false;
+    return isPrivateName(*ident.impl());
+}
+
+inline const Identifier* BuiltinNames::lookUpPrivateName(const Identifier& ident) const
+{
+    auto iter = m_publicToPrivateMap.find(ident.impl());
+    if (iter != m_publicToPrivateMap.end())
+        return iter->value;
+    return 0;
+}
+
+inline const Identifier& BuiltinNames::lookUpPublicName(const Identifier& ident) const
+{
+    auto iter = m_privateToPublicMap.find(ident.impl());
+    if (iter != m_privateToPublicMap.end())
+        return *iter->value;
+    return m_emptyIdentifier;
+}
+
+inline void BuiltinNames::appendExternalName(const Identifier& publicName, const Identifier& privateName)
+{
+#ifndef NDEBUG
+    for (const auto& key : m_publicToPrivateMap.keys())
+        ASSERT(publicName.string() != *key);
+#endif
+
+    m_privateToPublicMap.add(privateName.impl(), &publicName);
+    m_publicToPrivateMap.add(publicName.impl(), &privateName);
+}
+
+} // namespace JSC