Attachment 247012 Details for Bug 141859 – Patch

[patch] Patch

bug-141859-20150221094915.patch (text/plain), 174.20 KB, created by Yusuke Suzuki on 2015-02-20 16:49:22 PST

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Creator: Yusuke Suzuki

Created: 2015-02-20 16:49:22 PST

Size: 174.20 KB

patch

obsolete

>Subversion Revision: 180467
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 5f6c421a91e3f71d7358ca0b566e6a6f0d50b9bc..b2fe8a0f42c09efc902c5ec57375a37d41fba62e 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,151 @@
>+2015-02-20  Yusuke Suzuki  <utatane.tea@gmail.com>
>+
>+        REGRESSION(r179429): Can't type comments in Facebook
>+        https://bugs.webkit.org/show_bug.cgi?id=141859
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+		Revert a change because it breaks Facebook comment input.
>+
>+        * CMakeLists.txt:
>+        * DerivedSources.make:
>+        * JavaScriptCore.order:
>+        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
>+        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
>+        * JavaScriptCore.xcodeproj/project.pbxproj:
>+        * builtins/BuiltinExecutables.cpp:
>+        (JSC::BuiltinExecutables::createBuiltinExecutable):
>+        * builtins/BuiltinNames.h:
>+        * dfg/DFGOperations.cpp:
>+        (JSC::DFG::operationPutByValInternal):
>+        * inspector/JSInjectedScriptHost.cpp:
>+        (Inspector::JSInjectedScriptHost::subtype):
>+        * interpreter/Interpreter.cpp:
>+        * jit/JITOperations.cpp:
>+        (JSC::getByVal):
>+        * llint/LLIntData.cpp:
>+        (JSC::LLInt::Data::performAssertions):
>+        * llint/LLIntSlowPaths.cpp:
>+        (JSC::LLInt::getByVal):
>+        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
>+        * llint/LowLevelInterpreter.asm:
>+        * runtime/CommonIdentifiers.h:
>+        * runtime/CommonSlowPaths.cpp:
>+        (JSC::SLOW_PATH_DECL):
>+        * runtime/CommonSlowPaths.h:
>+        (JSC::CommonSlowPaths::opIn):
>+        * runtime/ExceptionHelpers.cpp:
>+        (JSC::createUndefinedVariableError):
>+        * runtime/JSCJSValue.cpp:
>+        (JSC::JSValue::synthesizePrototype):
>+        (JSC::JSValue::dumpInContextAssumingStructure):
>+        (JSC::JSValue::toStringSlowCase):
>+        * runtime/JSCJSValue.h:
>+        * runtime/JSCJSValueInlines.h:
>+        (JSC::JSValue::isPrimitive):
>+        (JSC::JSValue::getPropertySlot):
>+        (JSC::JSValue::get):
>+        (JSC::JSValue::equalSlowCaseInline):
>+        (JSC::JSValue::strictEqualSlowCaseInline):
>+        (JSC::JSValue::isSymbol): Deleted.
>+        (JSC::JSValue::toPropertyKey): Deleted.
>+        * runtime/JSCell.cpp:
>+        (JSC::JSCell::put):
>+        (JSC::JSCell::putByIndex):
>+        (JSC::JSCell::toPrimitive):
>+        (JSC::JSCell::getPrimitiveNumber):
>+        (JSC::JSCell::toNumber):
>+        (JSC::JSCell::toObject):
>+        * runtime/JSCell.h:
>+        * runtime/JSCellInlines.h:
>+        (JSC::JSCell::toBoolean):
>+        (JSC::JSCell::pureToBoolean):
>+        (JSC::JSCell::isSymbol): Deleted.
>+        * runtime/JSGlobalObject.cpp:
>+        (JSC::JSGlobalObject::init):
>+        (JSC::JSGlobalObject::visitChildren):
>+        * runtime/JSGlobalObject.h:
>+        (JSC::JSGlobalObject::symbolPrototype): Deleted.
>+        (JSC::JSGlobalObject::symbolObjectStructure): Deleted.
>+        * runtime/JSONObject.cpp:
>+        (JSC::Stringifier::Stringifier):
>+        * runtime/JSSymbolTableObject.cpp:
>+        (JSC::JSSymbolTableObject::getOwnNonIndexPropertyNames):
>+        * runtime/JSType.h:
>+        * runtime/JSTypeInfo.h:
>+        (JSC::TypeInfo::isName):
>+        * runtime/MapData.cpp:
>+        (JSC::MapData::find):
>+        (JSC::MapData::add):
>+        (JSC::MapData::remove):
>+        (JSC::MapData::replaceAndPackBackingStore):
>+        * runtime/MapData.h:
>+        (JSC::MapData::clear):
>+        * runtime/NameConstructor.cpp: Renamed from Source/JavaScriptCore/runtime/SymbolConstructor.cpp.
>+        (JSC::NameConstructor::NameConstructor):
>+        (JSC::NameConstructor::finishCreation):
>+        (JSC::constructPrivateName):
>+        (JSC::NameConstructor::getConstructData):
>+        (JSC::NameConstructor::getCallData):
>+        * runtime/NameConstructor.h: Renamed from Source/JavaScriptCore/runtime/SymbolConstructor.h.
>+        (JSC::NameConstructor::create):
>+        (JSC::NameConstructor::createStructure):
>+        * runtime/NameInstance.cpp: Copied from Source/JavaScriptCore/runtime/SymbolObject.cpp.
>+        (JSC::NameInstance::NameInstance):
>+        (JSC::NameInstance::destroy):
>+        * runtime/NameInstance.h: Copied from Source/JavaScriptCore/runtime/SymbolPrototype.h.
>+        (JSC::NameInstance::createStructure):
>+        (JSC::NameInstance::create):
>+        (JSC::NameInstance::privateName):
>+        (JSC::NameInstance::nameString):
>+        (JSC::NameInstance::finishCreation):
>+        (JSC::isName):
>+        * runtime/NamePrototype.cpp: Renamed from Source/JavaScriptCore/runtime/SymbolObject.cpp.
>+        (JSC::NamePrototype::NamePrototype):
>+        (JSC::NamePrototype::finishCreation):
>+        (JSC::NamePrototype::getOwnPropertySlot):
>+        (JSC::privateNameProtoFuncToString):
>+        * runtime/NamePrototype.h: Renamed from Source/JavaScriptCore/runtime/SymbolPrototype.h.
>+        (JSC::NamePrototype::create):
>+        (JSC::NamePrototype::createStructure):
>+        * runtime/ObjectConstructor.cpp:
>+        (JSC::objectConstructorGetOwnPropertyDescriptor):
>+        (JSC::objectConstructorDefineProperty):
>+        * runtime/ObjectPrototype.cpp:
>+        (JSC::objectProtoFuncHasOwnProperty):
>+        (JSC::objectProtoFuncDefineGetter):
>+        (JSC::objectProtoFuncDefineSetter):
>+        (JSC::objectProtoFuncLookupGetter):
>+        (JSC::objectProtoFuncLookupSetter):
>+        (JSC::objectProtoFuncPropertyIsEnumerable):
>+        * runtime/Operations.cpp:
>+        (JSC::jsTypeStringForValue):
>+        (JSC::jsIsObjectType):
>+        * runtime/PrivateName.h:
>+        (JSC::PrivateName::PrivateName):
>+        (JSC::PrivateName::operator==): Deleted.
>+        (JSC::PrivateName::operator!=): Deleted.
>+        * runtime/PropertyMapHashTable.h:
>+        (JSC::PropertyTable::find):
>+        (JSC::PropertyTable::get):
>+        * runtime/PropertyName.h:
>+        (JSC::PropertyName::PropertyName):
>+        (JSC::PropertyName::publicName):
>+        * runtime/SmallStrings.h:
>+        * runtime/StringConstructor.cpp:
>+        (JSC::callStringConstructor):
>+        * runtime/Structure.cpp:
>+        (JSC::Structure::getPropertyNamesFromStructure):
>+        * runtime/StructureInlines.h:
>+        (JSC::Structure::prototypeForLookup):
>+        * runtime/Symbol.cpp: Removed.
>+        * runtime/Symbol.h: Removed.
>+        * runtime/SymbolObject.h: Removed.
>+        * runtime/SymbolPrototype.cpp: Removed.
>+        * runtime/VM.cpp:
>+        (JSC::VM::VM):
>+        * runtime/VM.h:
>+
> 2015-02-20  Mark Lam  <mark.lam@apple.com>
> 
>         Refactor JSWrapperMap.mm to defer creation of the ObjC JSValue until the latest possible moment.
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index ee872041c93d32d1068980e4cf8dc17a703b5002..e71c1ebf493cafcbfd032f9193a876e2469545b0 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,28 @@
>+2015-02-20  Yusuke Suzuki  <utatane.tea@gmail.com>
>+
>+        REGRESSION(r179429): Can't type comments in Facebook
>+        https://bugs.webkit.org/show_bug.cgi?id=141859
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * wtf/text/AtomicString.h:
>+        (WTF::AtomicString::add):
>+        (WTF::AtomicString::addWithStringTableProvider):
>+        * wtf/text/StringImpl.cpp:
>+        (WTF::StringImpl::~StringImpl):
>+        (WTF::StringImpl::createUnique): Deleted.
>+        * wtf/text/StringImpl.h:
>+        (WTF::StringImpl::StringImpl):
>+        (WTF::StringImpl::createEmptyUnique):
>+        (WTF::StringImpl::isEmptyUnique):
>+        (WTF::StringImpl::setIsAtomic):
>+        (WTF::StringImpl::createUniqueEmpty): Deleted.
>+        (WTF::StringImpl::flagIsUnique): Deleted.
>+        (WTF::StringImpl::isUnique): Deleted.
>+        * wtf/text/StringStatics.cpp:
>+        (WTF::StringImpl::hashAndFlagsForEmptyUnique):
>+        (WTF::StringImpl::hashAndFlagsForUnique): Deleted.
>+
> 2015-02-20  Geoffrey Garen  <ggaren@apple.com>
> 
>         Remove TCMalloc
>diff --git a/Source/JavaScriptCore/CMakeLists.txt b/Source/JavaScriptCore/CMakeLists.txt
>index cb6d55e7379e23d42b3527c52adf656f53b3ed8a..fb2b677f2451a662a3e8a58ef45aac2edb92214e 100644
>--- a/Source/JavaScriptCore/CMakeLists.txt
>+++ b/Source/JavaScriptCore/CMakeLists.txt
>@@ -512,6 +512,9 @@ set(JavaScriptCore_RUNTIME_SOURCES
>     runtime/MathCommon.cpp
>     runtime/MathObject.cpp
>     runtime/MemoryStatistics.cpp
>+    runtime/NameConstructor.cpp
>+    runtime/NameInstance.cpp
>+    runtime/NamePrototype.cpp
>     runtime/NativeErrorConstructor.cpp
>     runtime/NativeErrorPrototype.cpp
>     runtime/NullGetterFunction.cpp
>@@ -552,10 +555,6 @@ set(JavaScriptCore_RUNTIME_SOURCES
>     runtime/StructureChain.cpp
>     runtime/StructureIDTable.cpp
>     runtime/StructureRareData.cpp
>-    runtime/Symbol.cpp
>-    runtime/SymbolObject.cpp
>-    runtime/SymbolPrototype.cpp
>-    runtime/SymbolConstructor.cpp
>     runtime/SymbolTable.cpp
>     runtime/TestRunnerUtils.cpp
>     runtime/TypeLocationCache.cpp
>@@ -589,6 +588,7 @@ set(JavaScriptCore_LUT_FILES
>     runtime/JSONObject.cpp
>     runtime/JSPromiseConstructor.cpp
>     runtime/JSPromisePrototype.cpp
>+    runtime/NamePrototype.cpp
>     runtime/NumberConstructor.cpp
>     runtime/NumberPrototype.cpp
>     runtime/ObjectConstructor.cpp
>@@ -596,7 +596,6 @@ set(JavaScriptCore_LUT_FILES
>     runtime/RegExpObject.cpp
>     runtime/RegExpPrototype.cpp
>     runtime/StringConstructor.cpp
>-    runtime/SymbolPrototype.cpp
> )
> 
> set(JavaScriptCore_LIBRARIES
>diff --git a/Source/JavaScriptCore/DerivedSources.make b/Source/JavaScriptCore/DerivedSources.make
>index 4a2623ef5c9c756d5da547f1d3d65cea9a17695a..12afea24a6ee56a60dc5b82efbf06c42ab30dc44 100644
>--- a/Source/JavaScriptCore/DerivedSources.make
>+++ b/Source/JavaScriptCore/DerivedSources.make
>@@ -48,6 +48,7 @@ all : \
>     JSPromiseConstructor.lut.h \
>     KeywordLookup.h \
>     Lexer.lut.h \
>+    NamePrototype.lut.h \
>     NumberConstructor.lut.h \
>     NumberPrototype.lut.h \
>     ObjectConstructor.lut.h \
>@@ -56,7 +57,6 @@ all : \
>     RegExpJitTables.h \
>     RegExpObject.lut.h \
>     StringConstructor.lut.h \
>-    SymbolPrototype.lut.h \
>     udis86_itab.h \
>     Bytecodes.h \
>     InitBytecodes.asm \
>diff --git a/Source/JavaScriptCore/JavaScriptCore.order b/Source/JavaScriptCore/JavaScriptCore.order
>index 26be0ee276e0ee5c86e610999f2d476b0dd806de..fd684f6f0039c5929d0b133a3057bac3cc916c0b 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.order
>+++ b/Source/JavaScriptCore/JavaScriptCore.order
>@@ -4599,8 +4599,14 @@ __ZN3JSCL24regExpConstructorDollar6EPNS_9ExecStateENS_7JSValueENS_12PropertyName
> __ZN3JSC5LexerIhE23parseIdentifierSlowCaseILb1EEENS_11JSTokenTypeEPNS_11JSTokenDataEjb
> __ZN3JSC4Yarr13YarrGeneratorILNS0_18YarrJITCompileModeE1EE33generatePatternCharacterNonGreedyEm
> __ZN3JSC4Yarr13YarrGeneratorILNS0_18YarrJITCompileModeE1EE34backtrackPatternCharacterNonGreedyEm
>+__ZN3JSC13NamePrototypeC1EPNS_9ExecStateEPNS_9StructureE
>+__ZN3JSC12NameInstanceC2ERNS_2VMEPNS_9StructureEPNS_8JSStringE
>+__ZN3JSC13NamePrototype14finishCreationEPNS_9ExecStateE
>+__ZN3JSC15NameConstructorC1EPNS_14JSGlobalObjectEPNS_9StructureE
>+__ZN3JSC15NameConstructor14finishCreationEPNS_9ExecStateEPNS_13NamePrototypeE
> _JSStringIsEqualToUTF8CString
> _JSStringIsEqual
>+__ZN3JSC12NameInstance7destroyEPNS_6JSCellE
> __ZN3WTF3MD5C1Ev
> __ZN3WTF3MD58addBytesEPKhm
> __ZN3WTFL12MD5TransformEPjPKj
>@@ -4750,7 +4756,9 @@ __ZN3JSC22createOutOfMemoryErrorEPNS_14JSGlobalObjectE
> __ZN3JSCL17mathProtoFuncACosEPNS_9ExecStateE
> __ZN3JSC11JSNameScope3putEPNS_6JSCellEPNS_9ExecStateENS_12PropertyNameENS_7JSValueERNS_15PutPropertySlotE
> __ZN3JSC14symbolTablePutINS_11JSNameScopeEEEbPT_PNS_9ExecStateENS_12PropertyNameENS_7JSValueEb
>+__ZN3JSC15NameConstructor11getCallDataEPNS_6JSCellERNS_8CallDataE
> __ZN3JSCL20constructPrivateNameEPNS_9ExecStateE
>+__ZN3JSC12NameInstanceC1ERNS_2VMEPNS_9StructureEPNS_8JSStringE
> __ZN3JSCL29objectProtoFuncToLocaleStringEPNS_9ExecStateE
> __ZN3JSC13JSNotAnObject24getOwnPropertyDescriptorEPNS_8JSObjectEPNS_9ExecStateENS_12PropertyNameERNS_18PropertyDescriptorE
> __ZN3JSCL20isNonLatin1IdentPartEi
>diff --git a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj
>index 41b2bd179d40bd04ab80b5ad7c03d7b56122951a..a21bf20247f9f8fbb938dec742329bc234d9531c 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj
>+++ b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj
>@@ -779,6 +779,9 @@
>     <ClCompile Include="..\runtime\MathCommon.cpp" />
>     <ClCompile Include="..\runtime\MathObject.cpp" />
>     <ClCompile Include="..\runtime\MemoryStatistics.cpp" />
>+    <ClCompile Include="..\runtime\NameConstructor.cpp" />
>+    <ClCompile Include="..\runtime\NameInstance.cpp" />
>+    <ClCompile Include="..\runtime\NamePrototype.cpp" />
>     <ClCompile Include="..\runtime\NativeErrorConstructor.cpp" />
>     <ClCompile Include="..\runtime\NativeErrorPrototype.cpp" />
>     <ClCompile Include="..\runtime\NullGetterFunction.cpp" />
>@@ -819,10 +822,6 @@
>     <ClCompile Include="..\runtime\StructureChain.cpp" />
>     <ClCompile Include="..\runtime\StructureIDTable.cpp" />
>     <ClCompile Include="..\runtime\StructureRareData.cpp" />
>-    <ClCompile Include="..\runtime\Symbol.cpp" />
>-    <ClCompile Include="..\runtime\SymbolConstructor.cpp" />
>-    <ClCompile Include="..\runtime\SymbolObject.cpp" />
>-    <ClCompile Include="..\runtime\SymbolPrototype.cpp" />
>     <ClCompile Include="..\runtime\SymbolTable.cpp" />
>     <ClCompile Include="..\runtime\TestRunnerUtils.cpp" />
>     <ClCompile Include="..\runtime\TypedArrayController.cpp" />
>@@ -871,6 +870,7 @@
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\JSPromisePrototype.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\KeywordLookup.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\Lexer.lut.h" />
>+    <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\NamePrototype.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\NumberConstructor.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\NumberPrototype.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\ObjectConstructor.lut.h" />
>@@ -879,7 +879,6 @@
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\RegExpObject.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\RegExpPrototype.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\StringConstructor.lut.h" />
>-    <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\SymbolPrototype.lut.h" />
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\JSCBuiltins.h" />
>   </ItemGroup>
>   <ItemGroup>
>@@ -1578,6 +1577,9 @@
>     <ClInclude Include="..\runtime\MathObject.h" />
>     <ClInclude Include="..\runtime\MemoryStatistics.h" />
>     <ClInclude Include="..\runtime\Microtask.h" />
>+    <ClInclude Include="..\runtime\NameConstructor.h" />
>+    <ClInclude Include="..\runtime\NameInstance.h" />
>+    <ClInclude Include="..\runtime\NamePrototype.h" />
>     <ClInclude Include="..\runtime\NativeErrorConstructor.h" />
>     <ClInclude Include="..\runtime\NativeErrorPrototype.h" />
>     <ClInclude Include="..\runtime\NullGetterFunction.h" />
>@@ -1632,10 +1634,6 @@
>     <ClInclude Include="..\runtime\StructureRareData.h" />
>     <ClInclude Include="..\runtime\StructureRareDataInlines.h" />
>     <ClInclude Include="..\runtime\StructureTransitionTable.h" />
>-    <ClInclude Include="..\runtime\Symbol.h" />
>-    <ClInclude Include="..\runtime\SymbolConstructor.h" />
>-    <ClInclude Include="..\runtime\SymbolObject.h" />
>-    <ClInclude Include="..\runtime\SymbolPrototype.h" />
>     <ClInclude Include="..\runtime\SymbolTable.h" />
>     <ClInclude Include="..\runtime\TestRunnerUtils.h" />
>     <ClInclude Include="..\runtime\Tracing.h" />
>diff --git a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>index 8048abe4716aa70360f51328559974f13258e500..7d8cdc4832e6752273306d5d0f0cd7b2c7c984c8 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>+++ b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>@@ -741,6 +741,15 @@
>     <ClCompile Include="..\runtime\MathObject.cpp">
>       <Filter>runtime</Filter>
>     </ClCompile>
>+    <ClCompile Include="..\runtime\NameConstructor.cpp">
>+      <Filter>runtime</Filter>
>+    </ClCompile>
>+    <ClCompile Include="..\runtime\NameInstance.cpp">
>+      <Filter>runtime</Filter>
>+    </ClCompile>
>+    <ClCompile Include="..\runtime\NamePrototype.cpp">
>+      <Filter>runtime</Filter>
>+    </ClCompile>
>     <ClCompile Include="..\runtime\NativeErrorConstructor.cpp">
>       <Filter>runtime</Filter>
>     </ClCompile>
>@@ -852,18 +861,6 @@
>     <ClCompile Include="..\runtime\StructureIDTable.cpp">
>       <Filter>runtime</Filter>
>     </ClCompile>
>-    <ClCompile Include="..\runtime\Symbol.cpp">
>-      <Filter>runtime</Filter>
>-    </ClCompile>
>-    <ClCompile Include="..\runtime\SymbolConstructor.cpp">
>-      <Filter>runtime</Filter>
>-    </ClCompile>
>-    <ClCompile Include="..\runtime\SymbolObject.cpp">
>-      <Filter>runtime</Filter>
>-    </ClCompile>
>-    <ClCompile Include="..\runtime\SymbolPrototype.cpp">
>-      <Filter>runtime</Filter>
>-    </ClCompile>
>     <ClCompile Include="..\runtime\SymbolTable.cpp">
>       <Filter>runtime</Filter>
>     </ClCompile>
>@@ -2766,6 +2763,15 @@
>     <ClInclude Include="..\runtime\MathObject.h">
>       <Filter>runtime</Filter>
>     </ClInclude>
>+    <ClInclude Include="..\runtime\NameConstructor.h">
>+      <Filter>runtime</Filter>
>+    </ClInclude>
>+    <ClInclude Include="..\runtime\NameInstance.h">
>+      <Filter>runtime</Filter>
>+    </ClInclude>
>+    <ClInclude Include="..\runtime\NamePrototype.h">
>+      <Filter>runtime</Filter>
>+    </ClInclude>
>     <ClInclude Include="..\runtime\NativeErrorConstructor.h">
>       <Filter>runtime</Filter>
>     </ClInclude>
>@@ -2901,18 +2907,6 @@
>     <ClInclude Include="..\runtime\StructureTransitionTable.h">
>       <Filter>runtime</Filter>
>     </ClInclude>
>-    <ClInclude Include="..\runtime\Symbol.h">
>-      <Filter>runtime</Filter>
>-    </ClInclude>
>-    <ClInclude Include="..\runtime\SymbolConstructor.h">
>-      <Filter>runtime</Filter>
>-    </ClInclude>
>-    <ClInclude Include="..\runtime\SymbolObject.h">
>-      <Filter>runtime</Filter>
>-    </ClInclude>
>-    <ClInclude Include="..\runtime\SymbolPrototype.h">
>-      <Filter>runtime</Filter>
>-    </ClInclude>
>     <ClInclude Include="..\runtime\SymbolTable.h">
>       <Filter>runtime</Filter>
>     </ClInclude>
>@@ -3259,7 +3253,7 @@
>     <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\RegExpObject.lut.h">
>       <Filter>Derived Sources</Filter>
>     </ClInclude>
>-    <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\SymbolPrototype.lut.h">
>+    <ClInclude Include="$(ConfigurationBuildDir)\obj$(PlatformArchitecture)\$(ProjectName)\DerivedSources\NamePrototype.lut.h">
>       <Filter>Derived Sources</Filter>
>     </ClInclude>
>     <ClInclude Include="..\heap\CodeBlockSet.h">
>diff --git a/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj b/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>index 2c01d6f10250b55b3f9c653dc0402002d8eeb488..369c0bc7f37cdb4cd4043587461c52adb4b2f149 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>+++ b/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>@@ -941,14 +941,6 @@
> 		65C0285D1717966800351E35 /* ARMv7DOpcode.h in Headers */ = {isa = PBXBuildFile; fileRef = 65C0285B1717966800351E35 /* ARMv7DOpcode.h */; };
> 		65FB5117184EEE7000C12B70 /* ProtoCallFrame.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 65FB5116184EE9BC00C12B70 /* ProtoCallFrame.cpp */; };
> 		6AD2CB4D19B9140100065719 /* DebuggerEvalEnabler.h in Headers */ = {isa = PBXBuildFile; fileRef = 6AD2CB4C19B9140100065719 /* DebuggerEvalEnabler.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		705B41AB1A6E501E00716757 /* Symbol.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 705B41A31A6E501E00716757 /* Symbol.cpp */; };
>-		705B41AC1A6E501E00716757 /* Symbol.h in Headers */ = {isa = PBXBuildFile; fileRef = 705B41A41A6E501E00716757 /* Symbol.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		705B41AD1A6E501E00716757 /* SymbolConstructor.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 705B41A51A6E501E00716757 /* SymbolConstructor.cpp */; };
>-		705B41AE1A6E501E00716757 /* SymbolConstructor.h in Headers */ = {isa = PBXBuildFile; fileRef = 705B41A61A6E501E00716757 /* SymbolConstructor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		705B41AF1A6E501E00716757 /* SymbolObject.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 705B41A71A6E501E00716757 /* SymbolObject.cpp */; };
>-		705B41B01A6E501E00716757 /* SymbolObject.h in Headers */ = {isa = PBXBuildFile; fileRef = 705B41A81A6E501E00716757 /* SymbolObject.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		705B41B11A6E501E00716757 /* SymbolPrototype.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 705B41A91A6E501E00716757 /* SymbolPrototype.cpp */; };
>-		705B41B21A6E501E00716757 /* SymbolPrototype.h in Headers */ = {isa = PBXBuildFile; fileRef = 705B41AA1A6E501E00716757 /* SymbolPrototype.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		7C008CD2186F8A9300955C24 /* JSPromiseFunctions.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7C008CD0186F8A9300955C24 /* JSPromiseFunctions.cpp */; };
> 		7C008CD3186F8A9300955C24 /* JSPromiseFunctions.h in Headers */ = {isa = PBXBuildFile; fileRef = 7C008CD1186F8A9300955C24 /* JSPromiseFunctions.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		7C008CDA187124BB00955C24 /* JSPromiseDeferred.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7C008CD8187124BB00955C24 /* JSPromiseDeferred.cpp */; };
>@@ -1034,6 +1026,12 @@
> 		86E3C61C167BABEE006D760A /* JSVirtualMachine.mm in Sources */ = {isa = PBXBuildFile; fileRef = 86E3C610167BAB87006D760A /* JSVirtualMachine.mm */; };
> 		86E3C61D167BABEE006D760A /* JSVirtualMachineInternal.h in Headers */ = {isa = PBXBuildFile; fileRef = 86E3C611167BAB87006D760A /* JSVirtualMachineInternal.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		86E85539111B9968001AF51E /* JSStringBuilder.h in Headers */ = {isa = PBXBuildFile; fileRef = 86E85538111B9968001AF51E /* JSStringBuilder.h */; };
>+		86EBF2FF1560F06A008E9222 /* NameConstructor.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 86EBF2F91560F036008E9222 /* NameConstructor.cpp */; };
>+		86EBF3001560F06A008E9222 /* NameConstructor.h in Headers */ = {isa = PBXBuildFile; fileRef = 86EBF2FA1560F036008E9222 /* NameConstructor.h */; };
>+		86EBF3011560F06A008E9222 /* NameInstance.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 86EBF2FB1560F036008E9222 /* NameInstance.cpp */; };
>+		86EBF3021560F06A008E9222 /* NameInstance.h in Headers */ = {isa = PBXBuildFile; fileRef = 86EBF2FC1560F036008E9222 /* NameInstance.h */; };
>+		86EBF3031560F06A008E9222 /* NamePrototype.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 86EBF2FD1560F036008E9222 /* NamePrototype.cpp */; };
>+		86EBF3041560F06A008E9222 /* NamePrototype.h in Headers */ = {isa = PBXBuildFile; fileRef = 86EBF2FE1560F036008E9222 /* NamePrototype.h */; };
> 		86EC9DC41328DF82002B2AD7 /* DFGByteCodeParser.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 86EC9DB41328DF82002B2AD7 /* DFGByteCodeParser.cpp */; };
> 		86EC9DC51328DF82002B2AD7 /* DFGByteCodeParser.h in Headers */ = {isa = PBXBuildFile; fileRef = 86EC9DB51328DF82002B2AD7 /* DFGByteCodeParser.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		86EC9DC61328DF82002B2AD7 /* DFGGenerationInfo.h in Headers */ = {isa = PBXBuildFile; fileRef = 86EC9DB61328DF82002B2AD7 /* DFGGenerationInfo.h */; settings = {ATTRIBUTES = (Private, ); }; };
>@@ -2620,14 +2618,6 @@
> 		65FB5116184EE9BC00C12B70 /* ProtoCallFrame.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ProtoCallFrame.cpp; sourceTree = "<group>"; };
> 		6AD2CB4C19B9140100065719 /* DebuggerEvalEnabler.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DebuggerEvalEnabler.h; sourceTree = "<group>"; };
> 		704FD35305697E6D003DBED9 /* BooleanObject.h */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 4; lastKnownFileType = sourcecode.c.h; path = BooleanObject.h; sourceTree = "<group>"; tabWidth = 8; };
>-		705B41A31A6E501E00716757 /* Symbol.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Symbol.cpp; sourceTree = "<group>"; };
>-		705B41A41A6E501E00716757 /* Symbol.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Symbol.h; sourceTree = "<group>"; };
>-		705B41A51A6E501E00716757 /* SymbolConstructor.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = SymbolConstructor.cpp; sourceTree = "<group>"; };
>-		705B41A61A6E501E00716757 /* SymbolConstructor.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SymbolConstructor.h; sourceTree = "<group>"; };
>-		705B41A71A6E501E00716757 /* SymbolObject.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = SymbolObject.cpp; sourceTree = "<group>"; };
>-		705B41A81A6E501E00716757 /* SymbolObject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SymbolObject.h; sourceTree = "<group>"; };
>-		705B41A91A6E501E00716757 /* SymbolPrototype.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = SymbolPrototype.cpp; sourceTree = "<group>"; };
>-		705B41AA1A6E501E00716757 /* SymbolPrototype.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SymbolPrototype.h; sourceTree = "<group>"; };
> 		7C008CD0186F8A9300955C24 /* JSPromiseFunctions.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; lineEnding = 0; path = JSPromiseFunctions.cpp; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.cpp; };
> 		7C008CD1186F8A9300955C24 /* JSPromiseFunctions.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSPromiseFunctions.h; sourceTree = "<group>"; };
> 		7C008CD8187124BB00955C24 /* JSPromiseDeferred.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSPromiseDeferred.cpp; sourceTree = "<group>"; };
>@@ -2725,6 +2715,12 @@
> 		86E3C610167BAB87006D760A /* JSVirtualMachine.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = JSVirtualMachine.mm; sourceTree = "<group>"; };
> 		86E3C611167BAB87006D760A /* JSVirtualMachineInternal.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSVirtualMachineInternal.h; sourceTree = "<group>"; };
> 		86E85538111B9968001AF51E /* JSStringBuilder.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSStringBuilder.h; sourceTree = "<group>"; };
>+		86EBF2F91560F036008E9222 /* NameConstructor.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = NameConstructor.cpp; sourceTree = "<group>"; };
>+		86EBF2FA1560F036008E9222 /* NameConstructor.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = NameConstructor.h; sourceTree = "<group>"; };
>+		86EBF2FB1560F036008E9222 /* NameInstance.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = NameInstance.cpp; sourceTree = "<group>"; };
>+		86EBF2FC1560F036008E9222 /* NameInstance.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = NameInstance.h; sourceTree = "<group>"; };
>+		86EBF2FD1560F036008E9222 /* NamePrototype.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = NamePrototype.cpp; sourceTree = "<group>"; };
>+		86EBF2FE1560F036008E9222 /* NamePrototype.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = NamePrototype.h; sourceTree = "<group>"; };
> 		86EC9DB41328DF82002B2AD7 /* DFGByteCodeParser.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = DFGByteCodeParser.cpp; path = dfg/DFGByteCodeParser.cpp; sourceTree = "<group>"; };
> 		86EC9DB51328DF82002B2AD7 /* DFGByteCodeParser.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DFGByteCodeParser.h; path = dfg/DFGByteCodeParser.h; sourceTree = "<group>"; };
> 		86EC9DB61328DF82002B2AD7 /* DFGGenerationInfo.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DFGGenerationInfo.h; path = dfg/DFGGenerationInfo.h; sourceTree = "<group>"; };
>@@ -4478,6 +4474,12 @@
> 				90213E3B123A40C200D422F3 /* MemoryStatistics.cpp */,
> 				90213E3C123A40C200D422F3 /* MemoryStatistics.h */,
> 				7C008CE5187631B600955C24 /* Microtask.h */,
>+				86EBF2F91560F036008E9222 /* NameConstructor.cpp */,
>+				86EBF2FA1560F036008E9222 /* NameConstructor.h */,
>+				86EBF2FB1560F036008E9222 /* NameInstance.cpp */,
>+				86EBF2FC1560F036008E9222 /* NameInstance.h */,
>+				86EBF2FD1560F036008E9222 /* NamePrototype.cpp */,
>+				86EBF2FE1560F036008E9222 /* NamePrototype.h */,
> 				BC02E9080E1839DB000F9297 /* NativeErrorConstructor.cpp */,
> 				BC02E9090E1839DB000F9297 /* NativeErrorConstructor.h */,
> 				BC02E90A0E1839DB000F9297 /* NativeErrorPrototype.cpp */,
>@@ -4575,14 +4577,6 @@
> 				C2FE18A316BAEC4000AF3061 /* StructureRareData.h */,
> 				C20BA92C16BB1C1500B3AEA2 /* StructureRareDataInlines.h */,
> 				BC9041470EB9250900FE26FA /* StructureTransitionTable.h */,
>-				705B41A31A6E501E00716757 /* Symbol.cpp */,
>-				705B41A41A6E501E00716757 /* Symbol.h */,
>-				705B41A51A6E501E00716757 /* SymbolConstructor.cpp */,
>-				705B41A61A6E501E00716757 /* SymbolConstructor.h */,
>-				705B41A71A6E501E00716757 /* SymbolObject.cpp */,
>-				705B41A81A6E501E00716757 /* SymbolObject.h */,
>-				705B41A91A6E501E00716757 /* SymbolPrototype.cpp */,
>-				705B41AA1A6E501E00716757 /* SymbolPrototype.h */,
> 				0F919D2715856770004A4E7D /* SymbolTable.cpp */,
> 				14A396A60CD2933100B5B4FF /* SymbolTable.h */,
> 				0FA2C17917D7CF84009D015F /* TestRunnerUtils.cpp */,
>@@ -6092,6 +6086,9 @@
> 				0F3D0BBD194A414300FC9CF9 /* ConstantStructureCheck.h in Headers */,
> 				7C008CE7187631B600955C24 /* Microtask.h in Headers */,
> 				86C568E211A213EE0007F7F0 /* MIPSAssembler.h in Headers */,
>+				86EBF3001560F06A008E9222 /* NameConstructor.h in Headers */,
>+				86EBF3021560F06A008E9222 /* NameInstance.h in Headers */,
>+				86EBF3041560F06A008E9222 /* NamePrototype.h in Headers */,
> 				BC02E9110E1839DB000F9297 /* NativeErrorConstructor.h in Headers */,
> 				BC02E9130E1839DB000F9297 /* NativeErrorPrototype.h in Headers */,
> 				99CC0B6318BE9950006CEBCC /* CodeGeneratorReplayInputs.py in Headers */,
>@@ -6251,10 +6248,6 @@
> 				BCCF0D080EF0AAB900413C8F /* StructureStubInfo.h in Headers */,
> 				BC9041480EB9250900FE26FA /* StructureTransitionTable.h in Headers */,
> 				C2DF44301707AC0100A5CA96 /* SuperRegion.h in Headers */,
>-				705B41AC1A6E501E00716757 /* Symbol.h in Headers */,
>-				705B41AE1A6E501E00716757 /* SymbolConstructor.h in Headers */,
>-				705B41B01A6E501E00716757 /* SymbolObject.h in Headers */,
>-				705B41B21A6E501E00716757 /* SymbolPrototype.h in Headers */,
> 				BC18C46B0E16F5CD00B34460 /* SymbolTable.h in Headers */,
> 				A784A26411D16622005776AC /* SyntaxChecker.h in Headers */,
> 				0F24E54F17EE274900ABB217 /* TempRegisterSet.h in Headers */,
>@@ -7227,6 +7220,9 @@
> 				14469DDF107EC7E700650446 /* MathObject.cpp in Sources */,
> 				90213E3D123A40C200D422F3 /* MemoryStatistics.cpp in Sources */,
> 				0FB5467D14F5CFD6002C2989 /* MethodOfGettingAValueProfile.cpp in Sources */,
>+				86EBF2FF1560F06A008E9222 /* NameConstructor.cpp in Sources */,
>+				86EBF3011560F06A008E9222 /* NameInstance.cpp in Sources */,
>+				86EBF3031560F06A008E9222 /* NamePrototype.cpp in Sources */,
> 				14469DE0107EC7E700650446 /* NativeErrorConstructor.cpp in Sources */,
> 				14469DE1107EC7E700650446 /* NativeErrorPrototype.cpp in Sources */,
> 				148F21B7107EC5470042EC2C /* Nodes.cpp in Sources */,
>@@ -7328,10 +7324,6 @@
> 				0F766D3815AE4A1C008F363E /* StructureStubClearingWatchpoint.cpp in Sources */,
> 				BCCF0D0C0EF0B8A500413C8F /* StructureStubInfo.cpp in Sources */,
> 				C2DF442F1707AC0100A5CA96 /* SuperRegion.cpp in Sources */,
>-				705B41AB1A6E501E00716757 /* Symbol.cpp in Sources */,
>-				705B41AD1A6E501E00716757 /* SymbolConstructor.cpp in Sources */,
>-				705B41AF1A6E501E00716757 /* SymbolObject.cpp in Sources */,
>-				705B41B11A6E501E00716757 /* SymbolPrototype.cpp in Sources */,
> 				0F919D2815856773004A4E7D /* SymbolTable.cpp in Sources */,
> 				0FC314131814559100033232 /* TempRegisterSet.cpp in Sources */,
> 				0FA2C17B17D7CF84009D015F /* TestRunnerUtils.cpp in Sources */,
>diff --git a/Source/JavaScriptCore/builtins/BuiltinExecutables.cpp b/Source/JavaScriptCore/builtins/BuiltinExecutables.cpp
>index 9fcdaa1e38dc6575bb791399a8e3aadc01913328..ef6737ee2c7e775bffd056a512dc3c23b0e885ed 100644
>--- a/Source/JavaScriptCore/builtins/BuiltinExecutables.cpp
>+++ b/Source/JavaScriptCore/builtins/BuiltinExecutables.cpp
>@@ -75,7 +75,7 @@ UnlinkedFunctionExecutable* BuiltinExecutables::createBuiltinExecutable(const So
>         
>         if (closedVariable == m_vm.propertyNames->undefinedKeyword.impl())
>             continue;
>-        RELEASE_ASSERT(closedVariable->isUnique());
>+        RELEASE_ASSERT(closedVariable->isEmptyUnique());
>     }
>     body->overrideName(name);
>     UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(&m_vm, source, body, UnlinkedBuiltinFunction);
>diff --git a/Source/JavaScriptCore/builtins/BuiltinNames.h b/Source/JavaScriptCore/builtins/BuiltinNames.h
>index 9b8896b968014913f46b32c480e057896379dfa4..67e1f563bca018d03209cf81052623601ba4405b 100644
>--- a/Source/JavaScriptCore/builtins/BuiltinNames.h
>+++ b/Source/JavaScriptCore/builtins/BuiltinNames.h
>@@ -31,7 +31,7 @@
> 
> namespace JSC {
>     
>-#define INITIALISE_BUILTIN_NAMES(name) , m_##name(vm, #name), m_##name##PrivateName(Identifier::from(PrivateName(ASCIILiteral("Symbol." #name))))
>+#define INITIALISE_BUILTIN_NAMES(name) , m_##name(vm, #name), m_##name##PrivateName(Identifier::from(PrivateName()))
> #define DECLARE_BUILTIN_NAMES(name) const Identifier m_##name; const Identifier m_##name##PrivateName;;
> #define DECLARE_BUILTIN_IDENTIFIER_ACCESSOR(name) \
>     const Identifier& name##PublicName() const { return m_##name; } \
>diff --git a/Source/JavaScriptCore/dfg/DFGOperations.cpp b/Source/JavaScriptCore/dfg/DFGOperations.cpp
>index 9c46fc976d314916187554ed450f9425a0199b75..dba62e1c9fffd4404c04d08537f49a1b9bb062e8 100644
>--- a/Source/JavaScriptCore/dfg/DFGOperations.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGOperations.cpp
>@@ -48,11 +48,11 @@
> #include "JSLexicalEnvironment.h"
> #include "VM.h"
> #include "JSNameScope.h"
>+#include "NameInstance.h"
> #include "ObjectConstructor.h"
> #include "JSCInlines.h"
> #include "Repatch.h"
> #include "StringConstructor.h"
>-#include "Symbol.h"
> #include "TypeProfilerLog.h"
> #include "TypedArrayInlines.h"
> #include <wtf/InlineASM.h>
>@@ -110,15 +110,25 @@ ALWAYS_INLINE static void JIT_OPERATION operationPutByValInternal(ExecState* exe
>         }
>     }
> 
>+    if (isName(property)) {
>+        PutPropertySlot slot(baseValue, strict);
>+        if (direct) {
>+            RELEASE_ASSERT(baseValue.isObject());
>+            asObject(baseValue)->putDirect(*vm, jsCast<NameInstance*>(property.asCell())->privateName(), value, slot);
>+        } else
>+            baseValue.put(exec, jsCast<NameInstance*>(property.asCell())->privateName(), value, slot);
>+        return;
>+    }
>+
>     // Don't put to an object if toString throws an exception.
>-    PropertyName propertyName = property.toPropertyKey(exec);
>+    Identifier ident = property.toString(exec)->toIdentifier(exec);
>     if (!vm->exception()) {
>         PutPropertySlot slot(baseValue, strict);
>         if (direct) {
>             RELEASE_ASSERT(baseValue.isObject());
>-            asObject(baseValue)->putDirect(*vm, propertyName, value, slot);
>+            asObject(baseValue)->putDirect(*vm, ident, value, slot);
>         } else
>-            baseValue.put(exec, propertyName, value, slot);
>+            baseValue.put(exec, ident, value, slot);
>     }
> }
> 
>@@ -296,8 +306,11 @@ EncodedJSValue JIT_OPERATION operationGetByVal(ExecState* exec, EncodedJSValue e
>         }
>     }
> 
>-    PropertyName propertyName = property.toPropertyKey(exec);
>-    return JSValue::encode(baseValue.get(exec, propertyName));
>+    if (isName(property))
>+        return JSValue::encode(baseValue.get(exec, jsCast<NameInstance*>(property.asCell())->privateName()));
>+
>+    Identifier ident = property.toString(exec)->toIdentifier(exec);
>+    return JSValue::encode(baseValue.get(exec, ident));
> }
> 
> EncodedJSValue JIT_OPERATION operationGetByValCell(ExecState* exec, JSCell* base, EncodedJSValue encodedProperty)
>@@ -324,8 +337,11 @@ EncodedJSValue JIT_OPERATION operationGetByValCell(ExecState* exec, JSCell* base
>         }
>     }
> 
>-    PropertyName propertyName = property.toPropertyKey(exec);
>-    return JSValue::encode(JSValue(base).get(exec, propertyName));
>+    if (isName(property))
>+        return JSValue::encode(JSValue(base).get(exec, jsCast<NameInstance*>(property.asCell())->privateName()));
>+
>+    Identifier ident = property.toString(exec)->toIdentifier(exec);
>+    return JSValue::encode(JSValue(base).get(exec, ident));
> }
> 
> ALWAYS_INLINE EncodedJSValue getByValCellInt(ExecState* exec, JSCell* base, int32_t index)
>diff --git a/Source/JavaScriptCore/inspector/JSInjectedScriptHost.cpp b/Source/JavaScriptCore/inspector/JSInjectedScriptHost.cpp
>index 5b3d3e6d3e155effabea3369d98b5e7d00f7d64c..f26b406a6f995478417fcf4ec52a7152a8cd8e1e 100644
>--- a/Source/JavaScriptCore/inspector/JSInjectedScriptHost.cpp
>+++ b/Source/JavaScriptCore/inspector/JSInjectedScriptHost.cpp
>@@ -126,8 +126,6 @@ JSValue JSInjectedScriptHost::subtype(ExecState* exec)
>         return exec->vm().smallStrings.booleanString();
>     if (value.isNumber())
>         return exec->vm().smallStrings.numberString();
>-    if (value.isSymbol())
>-        return exec->vm().smallStrings.symbolString();
> 
>     JSObject* object = asObject(value);
>     if (object && object->isErrorInstance())
>diff --git a/Source/JavaScriptCore/interpreter/Interpreter.cpp b/Source/JavaScriptCore/interpreter/Interpreter.cpp
>index febd0205398c0a42f954d049266939ac0b1843cc..ae762c0f95f63b8a0d366c785038b818eccc3b20 100644
>--- a/Source/JavaScriptCore/interpreter/Interpreter.cpp
>+++ b/Source/JavaScriptCore/interpreter/Interpreter.cpp
>@@ -54,6 +54,7 @@
> #include "LLIntThunks.h"
> #include "LegacyProfiler.h"
> #include "LiteralParser.h"
>+#include "NameInstance.h"
> #include "ObjectPrototype.h"
> #include "JSCInlines.h"
> #include "Parser.h"
>@@ -66,7 +67,6 @@
> #include "StackVisitor.h"
> #include "StrictEvalActivation.h"
> #include "StrongInlines.h"
>-#include "Symbol.h"
> #include "VMEntryScope.h"
> #include "VirtualRegister.h"
> 
>diff --git a/Source/JavaScriptCore/jit/JITOperations.cpp b/Source/JavaScriptCore/jit/JITOperations.cpp
>index 9b797c87ff0463303b35aa9ea096dfae8f0e03bd..4a200d11c0266d777d6a2476c9c95635f69c5757 100644
>--- a/Source/JavaScriptCore/jit/JITOperations.cpp
>+++ b/Source/JavaScriptCore/jit/JITOperations.cpp
>@@ -159,7 +159,7 @@ EncodedJSValue JIT_OPERATION operationGetByIdOptimize(ExecState* exec, Structure
> {
>     VM* vm = &exec->vm();
>     NativeCallFrameTracer tracer(vm, exec);
>-    Identifier ident = uid->isUnique() ? Identifier::from(PrivateName(uid)) : Identifier(vm, uid);
>+    Identifier ident = uid->isEmptyUnique() ? Identifier::from(PrivateName(uid)) : Identifier(vm, uid);
> 
>     JSValue baseValue = JSValue::decode(base);
>     PropertySlot slot(baseValue);
>@@ -466,8 +466,11 @@ static void putByVal(CallFrame* callFrame, JSValue baseValue, JSValue subscript,
>                 object->methodTable(vm)->putByIndex(object, callFrame, i, value, callFrame->codeBlock()->isStrictMode());
>         } else
>             baseValue.putByIndex(callFrame, i, value, callFrame->codeBlock()->isStrictMode());
>+    } else if (isName(subscript)) {
>+        PutPropertySlot slot(baseValue, callFrame->codeBlock()->isStrictMode());
>+        baseValue.put(callFrame, jsCast<NameInstance*>(subscript.asCell())->privateName(), value, slot);
>     } else {
>-        PropertyName property = subscript.toPropertyKey(callFrame);
>+        Identifier property = subscript.toString(callFrame)->toIdentifier(callFrame);
>         if (!callFrame->vm().exception()) { // Don't put to an object if toString threw an exception.
>             PutPropertySlot slot(baseValue, callFrame->codeBlock()->isStrictMode());
>             baseValue.put(callFrame, property, value, slot);
>@@ -480,8 +483,11 @@ static void directPutByVal(CallFrame* callFrame, JSObject* baseObject, JSValue s
>     if (LIKELY(subscript.isUInt32())) {
>         uint32_t i = subscript.asUInt32();
>         baseObject->putDirectIndex(callFrame, i, value);
>+    } else if (isName(subscript)) {
>+        PutPropertySlot slot(baseObject, callFrame->codeBlock()->isStrictMode());
>+        baseObject->putDirect(callFrame->vm(), jsCast<NameInstance*>(subscript.asCell())->privateName(), value, slot);
>     } else {
>-        PropertyName property = subscript.toPropertyKey(callFrame);
>+        Identifier property = subscript.toString(callFrame)->toIdentifier(callFrame);
>         if (!callFrame->vm().exception()) { // Don't put to an object if toString threw an exception.
>             PutPropertySlot slot(baseObject, callFrame->codeBlock()->isStrictMode());
>             baseObject->putDirect(callFrame->vm(), property, value, slot);
>@@ -1429,7 +1435,10 @@ static JSValue getByVal(ExecState* exec, JSValue baseValue, JSValue subscript, R
>         return baseValue.get(exec, i);
>     }
> 
>-    PropertyName property = subscript.toPropertyKey(exec);
>+    if (isName(subscript))
>+        return baseValue.get(exec, jsCast<NameInstance*>(subscript.asCell())->privateName());
>+
>+    Identifier property = subscript.toString(exec)->toIdentifier(exec);
>     return baseValue.get(exec, property);
> }
> 
>@@ -1564,8 +1573,10 @@ EncodedJSValue JIT_OPERATION operationGetByValString(ExecState* exec, EncodedJSV
>             if (!isJSString(baseValue))
>                 ctiPatchCallByReturnAddress(exec->codeBlock(), ReturnAddressPtr(OUR_RETURN_ADDRESS), FunctionPtr(operationGetByValDefault));
>         }
>-    } else {
>-        PropertyName property = subscript.toPropertyKey(exec);
>+    } else if (isName(subscript))
>+        result = baseValue.get(exec, jsCast<NameInstance*>(subscript.asCell())->privateName());
>+    else {
>+        Identifier property = subscript.toString(exec)->toIdentifier(exec);
>         result = baseValue.get(exec, property);
>     }
> 
>diff --git a/Source/JavaScriptCore/llint/LLIntData.cpp b/Source/JavaScriptCore/llint/LLIntData.cpp
>index ab01501b12917d9ee80ed31523f9258dc442da2e..997e3b98ff97f8684d07a117b7714fb10e96f541 100644
>--- a/Source/JavaScriptCore/llint/LLIntData.cpp
>+++ b/Source/JavaScriptCore/llint/LLIntData.cpp
>@@ -132,8 +132,8 @@ void Data::performAssertions(VM& vm)
>     ASSERT(maxFrameExtentForSlowPathCall == 64);
> #endif
>     ASSERT(StringType == 6);
>-    ASSERT(ObjectType == 18);
>-    ASSERT(FinalObjectType == 19);
>+    ASSERT(ObjectType == 17);
>+    ASSERT(FinalObjectType == 18);
>     ASSERT(MasqueradesAsUndefined == 1);
>     ASSERT(ImplementsHasInstance == 2);
>     ASSERT(ImplementsDefaultHasInstance == 8);
>diff --git a/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp b/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>index 83345a585e9f7f8c6886c0983d441dd308e021ff..40d68ba78e94d85734efd8297a5c0ace45742001 100644
>--- a/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>+++ b/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>@@ -745,7 +745,10 @@ inline JSValue getByVal(ExecState* exec, JSValue baseValue, JSValue subscript)
>         return baseValue.get(exec, i);
>     }
> 
>-    PropertyName property = subscript.toPropertyKey(exec);
>+    if (isName(subscript))
>+        return baseValue.get(exec, jsCast<NameInstance*>(subscript.asCell())->privateName());
>+    
>+    Identifier property = subscript.toString(exec)->toIdentifier(exec);
>     return baseValue.get(exec, property);
> }
> 
>@@ -795,7 +798,13 @@ inline JSValue getByVal(ExecState* exec, JSValue baseValue, JSValue subscript)
>         LLINT_END();
>     }
> 
>-    PropertyName property = subscript.toPropertyKey(exec);
>+    if (isName(subscript)) {
>+        PutPropertySlot slot(baseValue, exec->codeBlock()->isStrictMode());
>+        baseValue.put(exec, jsCast<NameInstance*>(subscript.asCell())->privateName(), value, slot);
>+        LLINT_END();
>+    }
>+
>+    Identifier property = subscript.toString(exec)->toIdentifier(exec);
>     LLINT_CHECK_EXCEPTION();
>     PutPropertySlot slot(baseValue, exec->codeBlock()->isStrictMode());
>     baseValue.put(exec, property, value, slot);
>@@ -814,8 +823,11 @@ inline JSValue getByVal(ExecState* exec, JSValue baseValue, JSValue subscript)
>     if (LIKELY(subscript.isUInt32())) {
>         uint32_t i = subscript.asUInt32();
>         baseObject->putDirectIndex(exec, i, value);
>+    } else if (isName(subscript)) {
>+        PutPropertySlot slot(baseObject, exec->codeBlock()->isStrictMode());
>+        baseObject->putDirect(exec->vm(), jsCast<NameInstance*>(subscript.asCell())->privateName(), value, slot);
>     } else {
>-        PropertyName property = subscript.toPropertyKey(exec);
>+        Identifier property = subscript.toString(exec)->toIdentifier(exec);
>         if (!exec->vm().exception()) { // Don't put to an object if toString threw an exception.
>             PutPropertySlot slot(baseObject, exec->codeBlock()->isStrictMode());
>             baseObject->putDirect(exec->vm(), property, value, slot);
>@@ -837,9 +849,11 @@ inline JSValue getByVal(ExecState* exec, JSValue baseValue, JSValue subscript)
>     uint32_t i;
>     if (subscript.getUInt32(i))
>         couldDelete = baseObject->methodTable()->deletePropertyByIndex(baseObject, exec, i);
>+    else if (isName(subscript))
>+        couldDelete = baseObject->methodTable()->deleteProperty(baseObject, exec, jsCast<NameInstance*>(subscript.asCell())->privateName());
>     else {
>         LLINT_CHECK_EXCEPTION();
>-        PropertyName property = subscript.toPropertyKey(exec);
>+        Identifier property = subscript.toString(exec)->toIdentifier(exec);
>         LLINT_CHECK_EXCEPTION();
>         couldDelete = baseObject->methodTable()->deleteProperty(baseObject, exec, property);
>     }
>diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
>index b7bdc03ee531035306587549472ea2389f9d1e83..1a8dac0e41048e82ce427eaec9b3c874e320f90b 100644
>--- a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
>+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
>@@ -156,8 +156,8 @@ const SlowPutArrayStorageShape = 30
> 
> # Type constants.
> const StringType = 6
>-const ObjectType = 18
>-const FinalObjectType = 19
>+const ObjectType = 17
>+const FinalObjectType = 18
> 
> # Type flags constants.
> const MasqueradesAsUndefined = 1
>diff --git a/Source/JavaScriptCore/runtime/CommonIdentifiers.h b/Source/JavaScriptCore/runtime/CommonIdentifiers.h
>index f111773f105574981e96877c4793e4e95adb5858..fca1eae699a5547564438f19c7887996016835e7 100644
>--- a/Source/JavaScriptCore/runtime/CommonIdentifiers.h
>+++ b/Source/JavaScriptCore/runtime/CommonIdentifiers.h
>@@ -52,7 +52,6 @@
>     macro(Set)\
>     macro(SetIterator)\
>     macro(String) \
>-    macro(Symbol) \
>     macro(SyntaxError) \
>     macro(TypeError) \
>     macro(URIError) \
>@@ -220,21 +219,8 @@
>     macro(with) \
>     macro(yield)
> 
>-#define JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(macro) \
>-    macro(hasInstance) \
>-    macro(isConcatSpreadable) \
>-    macro(iterator) \
>-    macro(match) \
>-    macro(replace) \
>-    macro(search) \
>-    macro(species) \
>-    macro(split) \
>-    macro(toPrimitive) \
>-    macro(toStringTag) \
>-    macro(unscopable)
>-
> #define JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(macro) \
>-    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(macro) \
>+    macro(iterator) \
>     macro(iteratorNext) \
>     macro(resolve) \
>     macro(reject) \
>diff --git a/Source/JavaScriptCore/runtime/CommonSlowPaths.cpp b/Source/JavaScriptCore/runtime/CommonSlowPaths.cpp
>index dfb94121690dc37e6015654bebad7404d1c363d7..08091a87e09d1f1ee98f4c0cc6b27bf50db15434 100644
>--- a/Source/JavaScriptCore/runtime/CommonSlowPaths.cpp
>+++ b/Source/JavaScriptCore/runtime/CommonSlowPaths.cpp
>@@ -486,9 +486,11 @@ static CommonSlowPaths::ArityCheckData* setupArityCheckData(VM& vm, int slotsToA
>     uint32_t i;
>     if (subscript.getUInt32(i))
>         couldDelete = baseObject->methodTable()->deletePropertyByIndex(baseObject, exec, i);
>+    else if (isName(subscript))
>+        couldDelete = baseObject->methodTable()->deleteProperty(baseObject, exec, jsCast<NameInstance*>(subscript.asCell())->privateName());
>     else {
>         CHECK_EXCEPTION();
>-        PropertyName property = subscript.toPropertyKey(exec);
>+        Identifier property = subscript.toString(exec)->toIdentifier(exec);
>         CHECK_EXCEPTION();
>         couldDelete = baseObject->methodTable()->deleteProperty(baseObject, exec, property);
>     }
>@@ -573,7 +575,7 @@ static CommonSlowPaths::ArityCheckData* setupArityCheckData(VM& vm, int slotsToA
>     JSValue baseValue = OP_C(2).jsValue();
>     JSValue property = OP(3).jsValue();
>     ASSERT(property.isString());
>-    RETURN(baseValue.get(exec, property.toPropertyKey(exec)));
>+    RETURN(baseValue.get(exec, property.toString(exec)->toIdentifier(exec)));
> }
> 
> SLOW_PATH_DECL(slow_path_get_structure_property_enumerator)
>diff --git a/Source/JavaScriptCore/runtime/CommonSlowPaths.h b/Source/JavaScriptCore/runtime/CommonSlowPaths.h
>index bfe483df6f98bf15c7df506e14f27fafd36a75a6..a56358cd6e0977743e87b3c165e2cea1aa47eda6 100644
>--- a/Source/JavaScriptCore/runtime/CommonSlowPaths.h
>+++ b/Source/JavaScriptCore/runtime/CommonSlowPaths.h
>@@ -30,8 +30,8 @@
> #include "CodeSpecializationKind.h"
> #include "ExceptionHelpers.h"
> #include "JSStackInlines.h"
>+#include "NameInstance.h"
> #include "StackAlignment.h"
>-#include "Symbol.h"
> #include "VM.h"
> #include <wtf/StdLibExtras.h>
> 
>@@ -82,7 +82,10 @@ inline bool opIn(ExecState* exec, JSValue propName, JSValue baseVal)
>     if (propName.getUInt32(i))
>         return baseObj->hasProperty(exec, i);
> 
>-    PropertyName property = propName.toPropertyKey(exec);
>+    if (isName(propName))
>+        return baseObj->hasProperty(exec, jsCast<NameInstance*>(propName.asCell())->privateName());
>+
>+    Identifier property = propName.toString(exec)->toIdentifier(exec);
>     if (exec->vm().exception())
>         return false;
>     return baseObj->hasProperty(exec, property);
>diff --git a/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp b/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp
>index 105aaef7f09aae152b85f3208b14bbf90a1f5ac3..5555395f32732582647bc9e57c62f0660da62ea3 100644
>--- a/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp
>+++ b/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp
>@@ -82,7 +82,7 @@ JSObject* createStackOverflowError(JSGlobalObject* globalObject)
> JSObject* createUndefinedVariableError(ExecState* exec, const Identifier& ident)
> {
>     
>-    if (ident.impl()->isUnique()) {
>+    if (ident.impl()->isEmptyUnique()) {
>         String message(makeString("Can't find private variable: @", exec->propertyNames().getPublicName(ident).string()));
>         return createReferenceError(exec, message);
>     }
>diff --git a/Source/JavaScriptCore/runtime/JSCJSValue.cpp b/Source/JavaScriptCore/runtime/JSCJSValue.cpp
>index 48756ba3b33f6cde8904e01f7f7b0934dd3e0ad7..c233f4c70021cd78532859e15b0cb63076c9e95a 100644
>--- a/Source/JavaScriptCore/runtime/JSCJSValue.cpp
>+++ b/Source/JavaScriptCore/runtime/JSCJSValue.cpp
>@@ -99,10 +99,8 @@ JSValue JSValue::toThisSlowCase(ExecState* exec, ECMAMode ecmaMode) const
> JSObject* JSValue::synthesizePrototype(ExecState* exec) const
> {
>     if (isCell()) {
>-        if (isString())
>-            return exec->lexicalGlobalObject()->stringPrototype();
>-        ASSERT(isSymbol());
>-        return exec->lexicalGlobalObject()->symbolPrototype();
>+        ASSERT(isString());
>+        return exec->lexicalGlobalObject()->stringPrototype();
>     }
> 
>     if (isNumber())
>@@ -233,7 +231,7 @@ void JSValue::dumpInContextAssumingStructure(
>                     out.print(" (atomic)");
>                 if (impl->isAtomic())
>                     out.print(" (identifier)");
>-                if (impl->isUnique())
>+                if (impl->isEmptyUnique())
>                     out.print(" (unique)");
>             } else
>                 out.print(" (unresolved)");
>@@ -366,10 +364,6 @@ JSString* JSValue::toStringSlowCase(ExecState* exec) const
>         return vm.smallStrings.nullString();
>     if (isUndefined())
>         return vm.smallStrings.undefinedString();
>-    if (isSymbol()) {
>-        throwTypeError(exec);
>-        return jsEmptyString(exec);
>-    }
> 
>     ASSERT(isCell());
>     JSValue value = asCell()->toPrimitive(exec, PreferString);
>diff --git a/Source/JavaScriptCore/runtime/JSCJSValue.h b/Source/JavaScriptCore/runtime/JSCJSValue.h
>index acab3fa6240a1112aa10e2931e6fdc115a03bdf1..c00cb5712d7c1c35fe2a882b579f02a2a68ae17c 100644
>--- a/Source/JavaScriptCore/runtime/JSCJSValue.h
>+++ b/Source/JavaScriptCore/runtime/JSCJSValue.h
>@@ -217,7 +217,6 @@ class JSValue {
>     bool isMachineInt() const;
>     bool isNumber() const;
>     bool isString() const;
>-    bool isSymbol() const;
>     bool isPrimitive() const;
>     bool isGetterSetter() const;
>     bool isCustomGetterSetter() const;
>@@ -243,7 +242,6 @@ class JSValue {
>     // been set in the ExecState already.
>     double toNumber(ExecState*) const;
>     JSString* toString(ExecState*) const;
>-    PropertyName toPropertyKey(ExecState*) const;
>     WTF::String toWTFString(ExecState*) const;
>     WTF::String toWTFStringInline(ExecState*) const;
>     JSObject* toObject(ExecState*) const;
>diff --git a/Source/JavaScriptCore/runtime/JSCJSValueInlines.h b/Source/JavaScriptCore/runtime/JSCJSValueInlines.h
>index d876dbe109e30f75245d8342ac7aa7fd4f04e842..1510b4185274e8a27e1d3bdf4ef8d8c713fa0ae8 100644
>--- a/Source/JavaScriptCore/runtime/JSCJSValueInlines.h
>+++ b/Source/JavaScriptCore/runtime/JSCJSValueInlines.h
>@@ -26,7 +26,6 @@
> #ifndef JSValueInlines_h
> #define JSValueInlines_h
> 
>-#include "Identifier.h"
> #include "InternalFunction.h"
> #include "JSCJSValue.h"
> #include "JSCellInlines.h"
>@@ -550,14 +549,9 @@ inline bool JSValue::isString() const
>     return isCell() && asCell()->isString();
> }
> 
>-inline bool JSValue::isSymbol() const
>-{
>-    return isCell() && asCell()->isSymbol();
>-}
>-
> inline bool JSValue::isPrimitive() const
> {
>-    return !isCell() || asCell()->isString() || asCell()->isSymbol();
>+    return !isCell() || asCell()->isString();
> }
> 
> inline bool JSValue::isGetterSetter() const
>@@ -610,17 +604,6 @@ ALWAYS_INLINE bool JSValue::getUInt32(uint32_t& v) const
>     return false;
> }
> 
>-ALWAYS_INLINE PropertyName JSValue::toPropertyKey(ExecState* exec) const
>-{
>-    if (isString())
>-        return asString(*this)->toIdentifier(exec);
>-
>-    JSValue primitive = toPrimitive(exec, PreferString);
>-    if (primitive.isSymbol())
>-        return asSymbol(primitive)->privateName();
>-    return primitive.toString(exec)->toIdentifier(exec);
>-}
>-
> inline JSValue JSValue::toPrimitive(ExecState* exec, PreferredPrimitiveType preferredType) const
> {
>     return isCell() ? asCell()->toPrimitive(exec, preferredType) : asValue();
>@@ -709,7 +692,7 @@ ALWAYS_INLINE bool JSValue::getPropertySlot(ExecState* exec, PropertyName proper
>     // and if it's a string there are special properties to check first.
>     JSObject* object;
>     if (UNLIKELY(!isObject())) {
>-        if (isString() && asString(*this)->getStringPropertySlot(exec, propertyName, slot))
>+        if (isCell() && asString(*this)->getStringPropertySlot(exec, propertyName, slot))
>             return true;
>         object = synthesizePrototype(exec);
>     } else
>@@ -730,7 +713,7 @@ ALWAYS_INLINE JSValue JSValue::get(ExecState* exec, unsigned propertyName, Prope
>     // and if it's a string there are special properties to check first.
>     JSObject* object;
>     if (UNLIKELY(!isObject())) {
>-        if (isString() && asString(*this)->getStringPropertySlot(exec, propertyName, slot))
>+        if (isCell() && asString(*this)->getStringPropertySlot(exec, propertyName, slot))
>             return slot.getValue(exec, propertyName);
>         object = synthesizePrototype(exec);
>     } else
>@@ -823,14 +806,6 @@ ALWAYS_INLINE bool JSValue::equalSlowCaseInline(ExecState* exec, JSValue v1, JSV
>             continue;
>         }
> 
>-        bool sym1 = v1.isSymbol();
>-        bool sym2 = v2.isSymbol();
>-        if (sym1 || sym2) {
>-            if (sym1 && sym2)
>-                return asSymbol(v1)->privateName() == asSymbol(v2)->privateName();
>-            return false;
>-        }
>-
>         if (s1 || s2) {
>             double d1 = v1.toNumber(exec);
>             double d2 = v2.toNumber(exec);
>@@ -856,8 +831,6 @@ ALWAYS_INLINE bool JSValue::strictEqualSlowCaseInline(ExecState* exec, JSValue v
> 
>     if (v1.asCell()->isString() && v2.asCell()->isString())
>         return WTF::equal(*asString(v1)->value(exec).impl(), *asString(v2)->value(exec).impl());
>-    if (v1.asCell()->isSymbol() && v2.asCell()->isSymbol())
>-        return asSymbol(v1)->privateName() == asSymbol(v2)->privateName();
> 
>     return v1 == v2;
> }
>diff --git a/Source/JavaScriptCore/runtime/JSCell.cpp b/Source/JavaScriptCore/runtime/JSCell.cpp
>index 2c403c813fb38568b0e60ce78989ddea4c953c12..694081db5f17784a54a48e085bad6e13d89f09c8 100644
>--- a/Source/JavaScriptCore/runtime/JSCell.cpp
>+++ b/Source/JavaScriptCore/runtime/JSCell.cpp
>@@ -96,7 +96,7 @@ ConstructType JSCell::getConstructData(JSCell*, ConstructData& constructData)
> 
> void JSCell::put(JSCell* cell, ExecState* exec, PropertyName identifier, JSValue value, PutPropertySlot& slot)
> {
>-    if (cell->isString() || cell->isSymbol()) {
>+    if (cell->isString()) {
>         JSValue(cell).putToPrimitive(exec, identifier, value, slot);
>         return;
>     }
>@@ -106,7 +106,7 @@ void JSCell::put(JSCell* cell, ExecState* exec, PropertyName identifier, JSValue
> 
> void JSCell::putByIndex(JSCell* cell, ExecState* exec, unsigned identifier, JSValue value, bool shouldThrow)
> {
>-    if (cell->isString() || cell->isSymbol()) {
>+    if (cell->isString()) {
>         PutPropertySlot slot(cell, shouldThrow);
>         JSValue(cell).putToPrimitive(exec, Identifier::from(exec, identifier), value, slot);
>         return;
>@@ -138,8 +138,6 @@ JSValue JSCell::toPrimitive(ExecState* exec, PreferredPrimitiveType preferredTyp
> {
>     if (isString())
>         return static_cast<const JSString*>(this)->toPrimitive(exec, preferredType);
>-    if (isSymbol())
>-        return static_cast<const Symbol*>(this)->toPrimitive(exec, preferredType);
>     return static_cast<const JSObject*>(this)->toPrimitive(exec, preferredType);
> }
> 
>@@ -147,8 +145,6 @@ bool JSCell::getPrimitiveNumber(ExecState* exec, double& number, JSValue& value)
> {
>     if (isString())
>         return static_cast<const JSString*>(this)->getPrimitiveNumber(exec, number, value);
>-    if (isSymbol())
>-        return static_cast<const Symbol*>(this)->getPrimitiveNumber(exec, number, value);
>     return static_cast<const JSObject*>(this)->getPrimitiveNumber(exec, number, value);
> }
> 
>@@ -156,8 +152,6 @@ double JSCell::toNumber(ExecState* exec) const
> { 
>     if (isString())
>         return static_cast<const JSString*>(this)->toNumber(exec);
>-    if (isSymbol())
>-        return static_cast<const Symbol*>(this)->toNumber(exec);
>     return static_cast<const JSObject*>(this)->toNumber(exec);
> }
> 
>@@ -165,8 +159,6 @@ JSObject* JSCell::toObject(ExecState* exec, JSGlobalObject* globalObject) const
> {
>     if (isString())
>         return static_cast<const JSString*>(this)->toObject(exec, globalObject);
>-    if (isSymbol())
>-        return static_cast<const Symbol*>(this)->toObject(exec, globalObject);
>     ASSERT(isObject());
>     return jsCast<JSObject*>(const_cast<JSCell*>(this));
> }
>diff --git a/Source/JavaScriptCore/runtime/JSCell.h b/Source/JavaScriptCore/runtime/JSCell.h
>index 4839f64fa1a820eeacb709f98c30b7af7c4e8194..f57a5c87995ca4c332e28a3657205a2d5c5e101e 100644
>--- a/Source/JavaScriptCore/runtime/JSCell.h
>+++ b/Source/JavaScriptCore/runtime/JSCell.h
>@@ -85,7 +85,6 @@ class JSCell {
> public:
>     // Querying the type.
>     bool isString() const;
>-    bool isSymbol() const;
>     bool isObject() const;
>     bool isGetterSetter() const;
>     bool isCustomGetterSetter() const;
>diff --git a/Source/JavaScriptCore/runtime/JSCellInlines.h b/Source/JavaScriptCore/runtime/JSCellInlines.h
>index b2fa4066bd2b50838f79b1ef6cad55b24ac6b7ed..151ae77adbd9003d974c0376fb6e2080d54cb75e 100644
>--- a/Source/JavaScriptCore/runtime/JSCellInlines.h
>+++ b/Source/JavaScriptCore/runtime/JSCellInlines.h
>@@ -35,7 +35,6 @@
> #include "JSString.h"
> #include "MarkedBlock.h"
> #include "Structure.h"
>-#include "Symbol.h"
> #include <wtf/CompilationThread.h>
> 
> namespace JSC {
>@@ -165,11 +164,6 @@ inline bool JSCell::isString() const
>     return m_type == StringType;
> }
> 
>-inline bool JSCell::isSymbol() const
>-{
>-    return m_type == SymbolType;
>-}
>-
> inline bool JSCell::isGetterSetter() const
> {
>     return m_type == GetterSetterType;
>@@ -253,19 +247,15 @@ inline const ClassInfo* JSCell::classInfo() const
> 
> inline bool JSCell::toBoolean(ExecState* exec) const
> {
>-    if (isString())
>+    if (isString()) 
>         return static_cast<const JSString*>(this)->toBoolean();
>-    if (isSymbol())
>-        return static_cast<const Symbol*>(this)->toBoolean();
>     return !structure()->masqueradesAsUndefined(exec->lexicalGlobalObject());
> }
> 
> inline TriState JSCell::pureToBoolean() const
> {
>-    if (isString())
>+    if (isString()) 
>         return static_cast<const JSString*>(this)->toBoolean() ? TrueTriState : FalseTriState;
>-    if (isSymbol())
>-        return static_cast<const Symbol*>(this)->toBoolean() ? TrueTriState : FalseTriState;
>     return MixedTriState;
> }
> 
>diff --git a/Source/JavaScriptCore/runtime/JSGlobalObject.cpp b/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
>index bb75492c5683ac65bbb9979dc0d885ae1c1608d8..db5e6b5dcbd1a55bc478b6578f0683352900707a 100644
>--- a/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
>+++ b/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
>@@ -95,6 +95,9 @@
> #include "MapPrototype.h"
> #include "MathObject.h"
> #include "Microtask.h"
>+#include "NameConstructor.h"
>+#include "NameInstance.h"
>+#include "NamePrototype.h"
> #include "NativeErrorConstructor.h"
> #include "NativeErrorPrototype.h"
> #include "NullGetterFunction.h"
>@@ -116,9 +119,6 @@
> #include "StrictEvalActivation.h"
> #include "StringConstructor.h"
> #include "StringPrototype.h"
>-#include "Symbol.h"
>-#include "SymbolConstructor.h"
>-#include "SymbolPrototype.h"
> #include "VariableWatchpointSetInlines.h"
> #include "WeakMapConstructor.h"
> #include "WeakMapPrototype.h"
>@@ -437,6 +437,15 @@ void JSGlobalObject::init(VM& vm)
>     JSConsole* consoleObject = JSConsole::create(vm, m_consoleStructure.get());
>     putDirectWithoutTransition(vm, Identifier(exec, "console"), consoleObject, DontEnum);
>     
>+    if (m_experimentsEnabled) {
>+        NamePrototype* privateNamePrototype = NamePrototype::create(exec, NamePrototype::createStructure(vm, this, m_objectPrototype.get()));
>+        m_privateNameStructure.set(vm, this, NameInstance::createStructure(vm, this, privateNamePrototype));
>+        
>+        JSCell* privateNameConstructor = NameConstructor::create(vm, NameConstructor::createStructure(vm, this, m_functionPrototype.get()), privateNamePrototype);
>+        privateNamePrototype->putDirectWithoutTransition(vm, vm.propertyNames->constructor, privateNameConstructor, DontEnum);
>+        putDirectWithoutTransition(vm, Identifier(exec, "Name"), privateNameConstructor, DontEnum);
>+    }
>+    
>     resetPrototype(vm, prototype());
> }
> 
>@@ -699,7 +708,7 @@ void JSGlobalObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
>     visitor.append(&thisObject->m_functionStructure);
>     visitor.append(&thisObject->m_boundFunctionStructure);
>     visitor.append(&thisObject->m_namedFunctionStructure);
>-    visitor.append(&thisObject->m_symbolObjectStructure);
>+    visitor.append(&thisObject->m_privateNameStructure);
>     visitor.append(&thisObject->m_regExpMatchesArrayStructure);
>     visitor.append(&thisObject->m_regExpStructure);
>     visitor.append(&thisObject->m_consoleStructure);
>diff --git a/Source/JavaScriptCore/runtime/JSGlobalObject.h b/Source/JavaScriptCore/runtime/JSGlobalObject.h
>index cac847089ad4e7afc7339338edaef5de15824eb8..b2d9b81c0a1ab9efaba0659f206c6224b6521c81 100644
>--- a/Source/JavaScriptCore/runtime/JSGlobalObject.h
>+++ b/Source/JavaScriptCore/runtime/JSGlobalObject.h
>@@ -35,7 +35,6 @@
> #include "StringPrototype.h"
> #include "StructureChain.h"
> #include "StructureRareDataInlines.h"
>-#include "SymbolPrototype.h"
> #include "VM.h"
> #include "Watchpoint.h"
> #include <JavaScriptCore/JSBase.h>
>@@ -92,7 +91,6 @@
>     macro(Map, map, map, JSMap, Map) \
>     macro(Date, date, date, DateInstance, Date) \
>     macro(String, string, stringObject, StringObject, String) \
>-    macro(Symbol, symbol, symbolObject, SymbolObject, Symbol) \
>     macro(Boolean, boolean, booleanObject, BooleanObject, Boolean) \
>     macro(Number, number, numberObject, NumberObject, Number) \
>     macro(Error, error, error, ErrorInstance, Error) \
>@@ -396,7 +394,6 @@ class JSGlobalObject : public JSSegmentedVariableObject {
>     ArrayPrototype* arrayPrototype() const { return m_arrayPrototype.get(); }
>     BooleanPrototype* booleanPrototype() const { return m_booleanPrototype.get(); }
>     StringPrototype* stringPrototype() const { return m_stringPrototype.get(); }
>-    SymbolPrototype* symbolPrototype() const { return m_symbolPrototype.get(); }
>     NumberPrototype* numberPrototype() const { return m_numberPrototype.get(); }
>     DatePrototype* datePrototype() const { return m_datePrototype.get(); }
>     RegExpPrototype* regExpPrototype() const { return m_regExpPrototype.get(); }
>@@ -456,7 +453,6 @@ class JSGlobalObject : public JSSegmentedVariableObject {
>     Structure* regExpStructure() const { return m_regExpStructure.get(); }
>     Structure* setStructure() const { return m_setStructure.get(); }
>     Structure* stringObjectStructure() const { return m_stringObjectStructure.get(); }
>-    Structure* symbolObjectStructure() const { return m_symbolObjectStructure.get(); }
>     Structure* iteratorResultStructure() const { return m_iteratorResultStructure.get(); }
>     static ptrdiff_t iteratorResultStructureOffset() { return OBJECT_OFFSETOF(JSGlobalObject, m_iteratorResultStructure); }
> 
>diff --git a/Source/JavaScriptCore/runtime/JSONObject.cpp b/Source/JavaScriptCore/runtime/JSONObject.cpp
>index 990743a558eea887993e227a6ed18e550c23e1a3..4974e882dc88ff2482d5a33d38ea02ac3140ad3b 100644
>--- a/Source/JavaScriptCore/runtime/JSONObject.cpp
>+++ b/Source/JavaScriptCore/runtime/JSONObject.cpp
>@@ -226,8 +226,7 @@ JSValue PropertyNameForFunctionCall::value(ExecState* exec) const
>             if (name.isObject()) {
>                 if (!asObject(name)->inherits(NumberObject::info()) && !asObject(name)->inherits(StringObject::info()))
>                     continue;
>-            } else if (!name.isNumber() && !name.isString())
>-                continue;
>+            }
> 
>             m_arrayReplacerPropertyNames.add(name.toString(exec)->toIdentifier(exec));
>         }
>diff --git a/Source/JavaScriptCore/runtime/JSSymbolTableObject.cpp b/Source/JavaScriptCore/runtime/JSSymbolTableObject.cpp
>index b8fb2282afae87ecc4110245ce9bb873e950f0ff..38d8b7fb30fa5185d006b645c5fe6d138f052c44 100644
>--- a/Source/JavaScriptCore/runtime/JSSymbolTableObject.cpp
>+++ b/Source/JavaScriptCore/runtime/JSSymbolTableObject.cpp
>@@ -61,7 +61,7 @@ void JSSymbolTableObject::getOwnNonIndexPropertyNames(JSObject* object, ExecStat
>         ConcurrentJITLocker locker(thisObject->symbolTable()->m_lock);
>         SymbolTable::Map::iterator end = thisObject->symbolTable()->end(locker);
>         for (SymbolTable::Map::iterator it = thisObject->symbolTable()->begin(locker); it != end; ++it) {
>-            if (it->key->isUnique())
>+            if (it->key->isEmptyUnique())
>                 continue;
>             if (!(it->value.getAttributes() & DontEnum) || shouldIncludeDontEnumProperties(mode))
>                 propertyNames.add(Identifier(exec, it->key.get()));
>diff --git a/Source/JavaScriptCore/runtime/JSType.h b/Source/JavaScriptCore/runtime/JSType.h
>index f86b54cf762d29bc3b78f5a247e912ed0688a325..ab14172b0c019fa2c58d67add68e9050a52eae2d 100644
>--- a/Source/JavaScriptCore/runtime/JSType.h
>+++ b/Source/JavaScriptCore/runtime/JSType.h
>@@ -33,7 +33,6 @@ enum JSType : uint8_t {
>     // The CellType value must come before any JSType that is a JSCell.
>     CellType,
>     StringType,
>-    SymbolType,
> 
>     GetterSetterType,
>     CustomGetterSetterType,
>@@ -53,6 +52,7 @@ enum JSType : uint8_t {
>     FinalObjectType,
>     JSCalleeType,
>     JSFunctionType,
>+    NameInstanceType,
>     NumberObjectType,
>     ErrorInstanceType,
>     PureForwardingProxyType,
>diff --git a/Source/JavaScriptCore/runtime/JSTypeInfo.h b/Source/JavaScriptCore/runtime/JSTypeInfo.h
>index f69596890922e5f426e11e57da2515962a6392d7..49118f34cb8111fc1798796bd4815884a6c7d024 100644
>--- a/Source/JavaScriptCore/runtime/JSTypeInfo.h
>+++ b/Source/JavaScriptCore/runtime/JSTypeInfo.h
>@@ -77,6 +77,7 @@ class TypeInfo {
>     static bool isObject(JSType type) { return type >= ObjectType; }
>     bool isFinalObject() const { return type() == FinalObjectType; }
>     bool isNumberObject() const { return type() == NumberObjectType; }
>+    bool isName() const { return type() == NameInstanceType; }
> 
>     unsigned flags() const { return (static_cast<unsigned>(m_flags2) << 8) | static_cast<unsigned>(m_flags); }
>     bool masqueradesAsUndefined() const { return isSetOnFlags1(MasqueradesAsUndefined); }
>diff --git a/Source/JavaScriptCore/runtime/MapData.cpp b/Source/JavaScriptCore/runtime/MapData.cpp
>index b05691c852ab2fd2bb3e547a4cdc09de36cb17fe..d7ca294e36db5a844183f4d39890b751cc3b95d6 100644
>--- a/Source/JavaScriptCore/runtime/MapData.cpp
>+++ b/Source/JavaScriptCore/runtime/MapData.cpp
>@@ -60,12 +60,6 @@
>             return 0;
>         return &m_entries[iter->value];
>     }
>-    if (key.value.isSymbol()) {
>-        auto iter = m_symbolKeyedTable.find(asSymbol(key.value)->privateName().uid());
>-        if (iter == m_symbolKeyedTable.end())
>-            return 0;
>-        return &m_entries[iter->value];
>-    }
>     if (key.value.isCell()) {
>         auto iter = m_cellKeyedTable.find(key.value.asCell());
>         if (iter == m_cellKeyedTable.end())
>@@ -113,8 +107,6 @@ void MapData::set(CallFrame* callFrame, KeyType key, JSValue value)
> {
>     if (key.value.isString())
>         return add(callFrame, m_stringKeyedTable, asString(key.value)->value(callFrame).impl(), key);
>-    if (key.value.isSymbol())
>-        return add(callFrame, m_symbolKeyedTable, asSymbol(key.value)->privateName().uid(), key);
>     if (key.value.isCell())
>         return add(callFrame, m_cellKeyedTable, key.value.asCell(), key);
>     return add(callFrame, m_valueKeyedTable, JSValue::encode(key.value), key);
>@@ -136,12 +128,6 @@ bool MapData::remove(CallFrame* callFrame, KeyType key)
>             return false;
>         location = iter->value;
>         m_stringKeyedTable.remove(iter);
>-    }  else if (key.value.isSymbol()) {
>-        auto iter = m_symbolKeyedTable.find(asSymbol(key.value)->privateName().uid());
>-        if (iter == m_symbolKeyedTable.end())
>-            return false;
>-        location = iter->value;
>-        m_symbolKeyedTable.remove(iter);
>     } else if (key.value.isCell()) {
>         auto iter = m_cellKeyedTable.find(key.value.asCell());
>         if (iter == m_cellKeyedTable.end())
>@@ -187,8 +173,6 @@ void MapData::replaceAndPackBackingStore(Entry* destination, int32_t newCapacity
>         ptr->value = m_entries[ptr->value].value.get().asInt32();
>     for (auto ptr = m_stringKeyedTable.begin(); ptr != m_stringKeyedTable.end(); ++ptr)
>         ptr->value = m_entries[ptr->value].value.get().asInt32();
>-    for (auto ptr = m_symbolKeyedTable.begin(); ptr != m_symbolKeyedTable.end(); ++ptr)
>-        ptr->value = m_entries[ptr->value].value.get().asInt32();
> 
>     ASSERT((m_size - newEnd) == m_deletedCount);
>     m_deletedCount = 0;
>diff --git a/Source/JavaScriptCore/runtime/MapData.h b/Source/JavaScriptCore/runtime/MapData.h
>index b1d5306296e5046bd4073ee99918ea6fe4fb1945..c0504a67599d262241d789636d017f56d854ee34 100644
>--- a/Source/JavaScriptCore/runtime/MapData.h
>+++ b/Source/JavaScriptCore/runtime/MapData.h
>@@ -112,7 +112,6 @@ class MapData : public JSCell {
>     typedef HashMap<JSCell*, int32_t, typename WTF::DefaultHash<JSCell*>::Hash, WTF::HashTraits<JSCell*>, IndexTraits> CellKeyedMap;
>     typedef HashMap<EncodedJSValue, int32_t, EncodedJSValueHash, EncodedJSValueHashTraits, IndexTraits> ValueKeyedMap;
>     typedef HashMap<StringImpl*, int32_t, typename WTF::DefaultHash<StringImpl*>::Hash, WTF::HashTraits<StringImpl*>, IndexTraits> StringKeyedMap;
>-    typedef HashMap<AtomicStringImpl*, int32_t, typename WTF::DefaultHash<AtomicStringImpl*>::Hash, WTF::HashTraits<AtomicStringImpl*>, IndexTraits> SymbolKeyedMap;
> 
>     size_t capacityInBytes() { return m_capacity * sizeof(Entry); }
> 
>@@ -135,7 +134,6 @@ class MapData : public JSCell {
>     CellKeyedMap m_cellKeyedTable;
>     ValueKeyedMap m_valueKeyedTable;
>     StringKeyedMap m_stringKeyedTable;
>-    SymbolKeyedMap m_symbolKeyedTable;
>     int32_t m_capacity;
>     int32_t m_size;
>     int32_t m_deletedCount;
>@@ -148,7 +146,6 @@ ALWAYS_INLINE void MapData::clear()
>     m_cellKeyedTable.clear();
>     m_valueKeyedTable.clear();
>     m_stringKeyedTable.clear();
>-    m_symbolKeyedTable.clear();
>     m_capacity = 0;
>     m_size = 0;
>     m_deletedCount = 0;
>diff --git a/Source/JavaScriptCore/runtime/NameConstructor.cpp b/Source/JavaScriptCore/runtime/NameConstructor.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..e497a96ecc37ada4918c4c03e822b59e4cf23255
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/NameConstructor.cpp
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2012 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.
>+ */
>+
>+#include "config.h"
>+#include "NameConstructor.h"
>+
>+#include "JSGlobalObject.h"
>+#include "NamePrototype.h"
>+#include "JSCInlines.h"
>+
>+namespace JSC {
>+
>+STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(NameConstructor);
>+
>+const ClassInfo NameConstructor::s_info = { "Function", &Base::s_info, 0, CREATE_METHOD_TABLE(NameConstructor) };
>+
>+NameConstructor::NameConstructor(VM& vm, Structure* structure)
>+    : InternalFunction(vm, structure)
>+{
>+}
>+
>+void NameConstructor::finishCreation(VM& vm, NamePrototype* prototype)
>+{
>+    Base::finishCreation(vm, prototype->classInfo()->className);
>+    putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
>+    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), DontDelete | ReadOnly | DontEnum);
>+}
>+
>+static EncodedJSValue JSC_HOST_CALL constructPrivateName(ExecState* exec)
>+{
>+    JSValue publicName = exec->argument(0);
>+    return JSValue::encode(NameInstance::create(exec->vm(), exec->lexicalGlobalObject()->privateNameStructure(), publicName.toString(exec)));
>+}
>+
>+ConstructType NameConstructor::getConstructData(JSCell*, ConstructData& constructData)
>+{
>+    constructData.native.function = constructPrivateName;
>+    return ConstructTypeHost;
>+}
>+
>+CallType NameConstructor::getCallData(JSCell*, CallData& callData)
>+{
>+    callData.native.function = constructPrivateName;
>+    return CallTypeHost;
>+}
>+
>+} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/NameConstructor.h b/Source/JavaScriptCore/runtime/NameConstructor.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..8e20f28fc88e5a06029463095a54c039551d4592
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/NameConstructor.h
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2012 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.
>+ */
>+
>+#ifndef NameConstructor_h
>+#define NameConstructor_h
>+
>+#include "InternalFunction.h"
>+#include "NameInstance.h"
>+
>+namespace JSC {
>+
>+class NamePrototype;
>+
>+class NameConstructor : public InternalFunction {
>+public:
>+    typedef InternalFunction Base;
>+
>+    static NameConstructor* create(VM& vm, Structure* structure, NamePrototype* prototype)
>+    {
>+        NameConstructor* constructor = new (NotNull, allocateCell<NameConstructor>(vm.heap)) NameConstructor(vm, structure);
>+        constructor->finishCreation(vm, prototype);
>+        return constructor;
>+    }
>+
>+    DECLARE_INFO;
>+
>+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype) 
>+    { 
>+        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info()); 
>+    }
>+
>+protected:
>+    void finishCreation(VM&, NamePrototype*);
>+    
>+private:
>+    NameConstructor(VM&, Structure*);
>+    static ConstructType getConstructData(JSCell*, ConstructData&);
>+    static CallType getCallData(JSCell*, CallData&);
>+};
>+
>+} // namespace JSC
>+
>+#endif // NameConstructor_h
>diff --git a/Source/JavaScriptCore/runtime/NameInstance.cpp b/Source/JavaScriptCore/runtime/NameInstance.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..f6d7f7808542194663ecc87eff5dfe770581b0f6
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/NameInstance.cpp
>@@ -0,0 +1,47 @@
>+/*
>+ * Copyright (C) 2012 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.
>+ */
>+
>+#include "config.h"
>+#include "NameInstance.h"
>+
>+#include "JSScope.h"
>+#include "JSCInlines.h"
>+
>+namespace JSC {
>+
>+const ClassInfo NameInstance::s_info = { "Name", &Base::s_info, 0, CREATE_METHOD_TABLE(NameInstance) };
>+
>+NameInstance::NameInstance(VM& vm, Structure* structure, JSString* nameString)
>+    : Base(vm, structure)
>+{
>+    m_nameString.set(vm, this, nameString);
>+}
>+
>+void NameInstance::destroy(JSCell* cell)
>+{
>+    static_cast<NameInstance*>(cell)->NameInstance::~NameInstance();
>+}
>+
>+} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/NameInstance.h b/Source/JavaScriptCore/runtime/NameInstance.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..55842d52b89d3de7082713ab1d8dee7b318c057c
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/NameInstance.h
>@@ -0,0 +1,77 @@
>+/*
>+ * Copyright (C) 2012 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.
>+ */
>+
>+#ifndef NameInstance_h
>+#define NameInstance_h
>+
>+#include "JSDestructibleObject.h"
>+#include "PrivateName.h"
>+
>+namespace JSC {
>+
>+class NameInstance : public JSDestructibleObject {
>+public:
>+    typedef JSDestructibleObject Base;
>+
>+    DECLARE_INFO;
>+
>+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>+    {
>+        return Structure::create(vm, globalObject, prototype, TypeInfo(NameInstanceType, StructureFlags), info());
>+    }
>+
>+    static NameInstance* create(VM& vm, Structure* structure, JSString* nameString)
>+    {
>+        NameInstance* name = new (NotNull, allocateCell<NameInstance>(vm.heap)) NameInstance(vm, structure, nameString);
>+        name->finishCreation(vm);
>+        return name;
>+    }
>+
>+    const PrivateName& privateName() { return m_privateName; }
>+    JSString* nameString() { return m_nameString.get(); }
>+
>+protected:
>+    static void destroy(JSCell*);
>+
>+    NameInstance(VM&, Structure*, JSString*);
>+
>+    void finishCreation(VM& vm)
>+    {
>+        Base::finishCreation(vm);
>+        ASSERT(inherits(info()));
>+    }
>+
>+    PrivateName m_privateName;
>+    WriteBarrier<JSString> m_nameString;
>+};
>+
>+inline bool isName(JSValue v)
>+{
>+    return v.isCell() && v.asCell()->type() == NameInstanceType;
>+}
>+
>+} // namespace JSC
>+
>+#endif // NameInstance_h
>diff --git a/Source/JavaScriptCore/runtime/NamePrototype.cpp b/Source/JavaScriptCore/runtime/NamePrototype.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..bf08d9aaea396932994f47e5f80d7b94f1521d1c
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/NamePrototype.cpp
>@@ -0,0 +1,81 @@
>+/*
>+ * Copyright (C) 2012 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.
>+ */
>+
>+#include "config.h"
>+#include "NamePrototype.h"
>+
>+#include "Error.h"
>+#include "JSCInlines.h"
>+
>+namespace JSC {
>+
>+static EncodedJSValue JSC_HOST_CALL privateNameProtoFuncToString(ExecState*);
>+
>+}
>+
>+#include "NamePrototype.lut.h"
>+
>+namespace JSC {
>+
>+const ClassInfo NamePrototype::s_info = { "Name", &Base::s_info, &privateNamePrototypeTable, CREATE_METHOD_TABLE(NamePrototype) };
>+
>+/* Source for NamePrototype.lut.h
>+@begin privateNamePrototypeTable
>+  toString          privateNameProtoFuncToString         DontEnum|Function 0
>+@end
>+*/
>+
>+NamePrototype::NamePrototype(ExecState* exec, Structure* structure)
>+    : Base(exec->vm(), structure, jsEmptyString(exec))
>+{
>+}
>+
>+void NamePrototype::finishCreation(VM& vm)
>+{
>+    Base::finishCreation(vm);
>+    ASSERT(inherits(info()));
>+}
>+
>+bool NamePrototype::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
>+{
>+    return getStaticFunctionSlot<Base>(exec, privateNamePrototypeTable, jsCast<NamePrototype*>(object), propertyName, slot);
>+}
>+
>+// ------------------------------ Functions ---------------------------
>+
>+EncodedJSValue JSC_HOST_CALL privateNameProtoFuncToString(ExecState* exec)
>+{
>+    JSValue thisValue = exec->thisValue();
>+    if (!thisValue.isObject())
>+        return throwVMTypeError(exec);
>+
>+    JSObject* thisObject = asObject(thisValue);
>+    if (!thisObject->inherits(NameInstance::info()))
>+        return throwVMTypeError(exec);
>+
>+    return JSValue::encode(jsCast<NameInstance*>(thisObject)->nameString());
>+}
>+
>+} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/NamePrototype.h b/Source/JavaScriptCore/runtime/NamePrototype.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..d4b947f72d3b03cfeaf0177f15d7e55b38aa6946
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/NamePrototype.h
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2012 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.
>+ */
>+
>+#ifndef NamePrototype_h
>+#define NamePrototype_h
>+
>+#include "NameInstance.h"
>+
>+namespace JSC {
>+
>+class NamePrototype : public NameInstance {
>+public:
>+    typedef NameInstance Base;
>+
>+    static NamePrototype* create(ExecState* exec, Structure* structure)
>+    {
>+        VM& vm = exec->vm();
>+        NamePrototype* prototype = new (NotNull, allocateCell<NamePrototype>(vm.heap)) NamePrototype(exec, structure);
>+        prototype->finishCreation(vm);
>+        return prototype;
>+    }
>+    
>+    DECLARE_INFO;
>+
>+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>+    {
>+        return Structure::create(vm, globalObject, prototype, TypeInfo(NameInstanceType, StructureFlags), info());
>+    }
>+
>+protected:
>+    NamePrototype(ExecState*, Structure*);
>+    void finishCreation(VM&);
>+
>+    static const unsigned StructureFlags = OverridesGetOwnPropertySlot | NameInstance::StructureFlags;
>+
>+private:
>+    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
>+};
>+
>+} // namespace JSC
>+
>+#endif // NamePrototype_h
>diff --git a/Source/JavaScriptCore/runtime/ObjectConstructor.cpp b/Source/JavaScriptCore/runtime/ObjectConstructor.cpp
>index 602e575289e16cdc16a0bba349785f2e27ef17dd..a87a4fc3cc906de05c0103083b25d3ddc2c8b2ba 100644
>--- a/Source/JavaScriptCore/runtime/ObjectConstructor.cpp
>+++ b/Source/JavaScriptCore/runtime/ObjectConstructor.cpp
>@@ -173,7 +173,7 @@ EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyDescriptor(ExecState
> {
>     if (!exec->argument(0).isObject())
>         return throwVMError(exec, createTypeError(exec, ASCIILiteral("Requested property descriptor of a value that is not an object.")));
>-    PropertyName propertyName = exec->argument(1).toPropertyKey(exec);
>+    Identifier propertyName = exec->argument(1).toString(exec)->toIdentifier(exec);
>     if (exec->hadException())
>         return JSValue::encode(jsNull());
>     JSObject* object = asObject(exec->argument(0));
>@@ -316,7 +316,7 @@ EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperty(ExecState* exec)
>     if (!exec->argument(0).isObject())
>         return throwVMError(exec, createTypeError(exec, ASCIILiteral("Properties can only be defined on Objects.")));
>     JSObject* O = asObject(exec->argument(0));
>-    PropertyName propertyName = exec->argument(1).toPropertyKey(exec);
>+    Identifier propertyName = exec->argument(1).toString(exec)->toIdentifier(exec);
>     if (exec->hadException())
>         return JSValue::encode(jsNull());
>     PropertyDescriptor descriptor;
>diff --git a/Source/JavaScriptCore/runtime/ObjectPrototype.cpp b/Source/JavaScriptCore/runtime/ObjectPrototype.cpp
>index a74b2a55fc4c96a7f23693fcd06107a6fb4a0688..33b4420fbccf8b4002d451f3a00db4948f5fb84c 100644
>--- a/Source/JavaScriptCore/runtime/ObjectPrototype.cpp
>+++ b/Source/JavaScriptCore/runtime/ObjectPrototype.cpp
>@@ -85,7 +85,7 @@ EncodedJSValue JSC_HOST_CALL objectProtoFuncValueOf(ExecState* exec)
> EncodedJSValue JSC_HOST_CALL objectProtoFuncHasOwnProperty(ExecState* exec)
> {
>     JSValue thisValue = exec->thisValue().toThis(exec, StrictMode);
>-    return JSValue::encode(jsBoolean(thisValue.toObject(exec)->hasOwnProperty(exec, exec->argument(0).toPropertyKey(exec))));
>+    return JSValue::encode(jsBoolean(thisValue.toObject(exec)->hasOwnProperty(exec, exec->argument(0).toString(exec)->toIdentifier(exec))));
> }
> 
> EncodedJSValue JSC_HOST_CALL objectProtoFuncIsPrototypeOf(ExecState* exec)
>@@ -122,7 +122,7 @@ EncodedJSValue JSC_HOST_CALL objectProtoFuncDefineGetter(ExecState* exec)
>     descriptor.setGetter(get);
>     descriptor.setEnumerable(true);
>     descriptor.setConfigurable(true);
>-    thisObject->methodTable(exec->vm())->defineOwnProperty(thisObject, exec, exec->argument(0).toPropertyKey(exec), descriptor, false);
>+    thisObject->methodTable(exec->vm())->defineOwnProperty(thisObject, exec, exec->argument(0).toString(exec)->toIdentifier(exec), descriptor, false);
> 
>     return JSValue::encode(jsUndefined());
> }
>@@ -142,7 +142,7 @@ EncodedJSValue JSC_HOST_CALL objectProtoFuncDefineSetter(ExecState* exec)
>     descriptor.setSetter(set);
>     descriptor.setEnumerable(true);
>     descriptor.setConfigurable(true);
>-    thisObject->methodTable(exec->vm())->defineOwnProperty(thisObject, exec, exec->argument(0).toPropertyKey(exec), descriptor, false);
>+    thisObject->methodTable(exec->vm())->defineOwnProperty(thisObject, exec, exec->argument(0).toString(exec)->toIdentifier(exec), descriptor, false);
> 
>     return JSValue::encode(jsUndefined());
> }
>@@ -154,7 +154,7 @@ EncodedJSValue JSC_HOST_CALL objectProtoFuncLookupGetter(ExecState* exec)
>         return JSValue::encode(jsUndefined());
> 
>     PropertySlot slot(thisObject);
>-    if (thisObject->getPropertySlot(exec, exec->argument(0).toPropertyKey(exec), slot)
>+    if (thisObject->getPropertySlot(exec, exec->argument(0).toString(exec)->toIdentifier(exec), slot)
>         && slot.isAccessor()) {
>         GetterSetter* getterSetter = slot.getterSetter();
>         return getterSetter->isGetterNull() ? JSValue::encode(jsUndefined()) : JSValue::encode(getterSetter->getter());
>@@ -170,7 +170,7 @@ EncodedJSValue JSC_HOST_CALL objectProtoFuncLookupSetter(ExecState* exec)
>         return JSValue::encode(jsUndefined());
> 
>     PropertySlot slot(thisObject);
>-    if (thisObject->getPropertySlot(exec, exec->argument(0).toPropertyKey(exec), slot)
>+    if (thisObject->getPropertySlot(exec, exec->argument(0).toString(exec)->toIdentifier(exec), slot)
>         && slot.isAccessor()) {
>         GetterSetter* getterSetter = slot.getterSetter();
>         return getterSetter->isSetterNull() ? JSValue::encode(jsUndefined()) : JSValue::encode(getterSetter->setter());
>@@ -182,7 +182,7 @@ EncodedJSValue JSC_HOST_CALL objectProtoFuncLookupSetter(ExecState* exec)
> EncodedJSValue JSC_HOST_CALL objectProtoFuncPropertyIsEnumerable(ExecState* exec)
> {
>     JSObject* thisObject = exec->thisValue().toThis(exec, StrictMode).toObject(exec);
>-    PropertyName propertyName = exec->argument(0).toPropertyKey(exec);
>+    Identifier propertyName = exec->argument(0).toString(exec)->toIdentifier(exec);
> 
>     PropertyDescriptor descriptor;
>     bool enumerable = thisObject->getOwnPropertyDescriptor(exec, propertyName, descriptor) && descriptor.enumerable();
>diff --git a/Source/JavaScriptCore/runtime/Operations.cpp b/Source/JavaScriptCore/runtime/Operations.cpp
>index 0c9ccb6e39dd12dc0ea60d9dcad38d846c4a18c7..36d832f4420b73e316ad81820c4fc34bb177146a 100644
>--- a/Source/JavaScriptCore/runtime/Operations.cpp
>+++ b/Source/JavaScriptCore/runtime/Operations.cpp
>@@ -65,8 +65,6 @@ JSValue jsTypeStringForValue(VM& vm, JSGlobalObject* globalObject, JSValue v)
>         return vm.smallStrings.numberString();
>     if (v.isString())
>         return vm.smallStrings.stringString();
>-    if (v.isSymbol())
>-        return vm.smallStrings.symbolString();
>     if (v.isObject()) {
>         // Return "undefined" for objects that should be treated
>         // as null when doing comparisons.
>@@ -91,7 +89,7 @@ bool jsIsObjectType(CallFrame* callFrame, JSValue v)
>         return v.isNull();
> 
>     JSType type = v.asCell()->type();
>-    if (type == StringType || type == SymbolType)
>+    if (type == StringType)
>         return false;
>     if (type >= ObjectType) {
>         if (asObject(v)->structure(callFrame->vm())->masqueradesAsUndefined(callFrame->lexicalGlobalObject()))
>diff --git a/Source/JavaScriptCore/runtime/PrivateName.h b/Source/JavaScriptCore/runtime/PrivateName.h
>index 21416446645c7fff03f7c82d178739ad5608bf64..55ee634d2a93a5952c71eb0ffd625c7581c0eb16 100644
>--- a/Source/JavaScriptCore/runtime/PrivateName.h
>+++ b/Source/JavaScriptCore/runtime/PrivateName.h
>@@ -33,26 +33,17 @@
> class PrivateName {
> public:
>     PrivateName()
>-        : m_impl(StringImpl::createUniqueEmpty())
>+        : m_impl(StringImpl::createEmptyUnique())
>     {
>-        ASSERT(m_impl->isUnique());
>-    }
>-    PrivateName(const String& description)
>-        : m_impl(StringImpl::createUnique(description.impl()))
>-    {
>-        ASSERT(m_impl->isUnique());
>     }
>     explicit PrivateName(StringImpl* uid)
>         : m_impl(uid)
>     {
>-        ASSERT(m_impl->isUnique());
>+        ASSERT(m_impl->isEmptyUnique());
>     }
> 
>     AtomicStringImpl* uid() const { return static_cast<AtomicStringImpl*>(m_impl.get()); }
> 
>-    bool operator==(const PrivateName& other) const { return uid() == other.uid(); }
>-    bool operator!=(const PrivateName& other) const { return uid() != other.uid(); }
>-
> private:
>     RefPtr<StringImpl> m_impl;
> };
>diff --git a/Source/JavaScriptCore/runtime/PropertyMapHashTable.h b/Source/JavaScriptCore/runtime/PropertyMapHashTable.h
>index 0370a3548da986d0411313e04dac2d15c6ba0904..d7334c0aedc0fea55ecd1743cf4e9281045b7616 100644
>--- a/Source/JavaScriptCore/runtime/PropertyMapHashTable.h
>+++ b/Source/JavaScriptCore/runtime/PropertyMapHashTable.h
>@@ -271,7 +271,7 @@ inline PropertyTable::const_iterator PropertyTable::end() const
> inline PropertyTable::find_iterator PropertyTable::find(const KeyType& key)
> {
>     ASSERT(key);
>-    ASSERT(key->isAtomic() || key->isUnique());
>+    ASSERT(key->isAtomic() || key->isEmptyUnique());
>     unsigned hash = key->existingHash();
>     unsigned step = 0;
> 
>@@ -305,7 +305,7 @@ inline PropertyTable::find_iterator PropertyTable::find(const KeyType& key)
> inline PropertyTable::ValueType* PropertyTable::get(const KeyType& key)
> {
>     ASSERT(key);
>-    ASSERT(key->isAtomic() || key->isUnique());
>+    ASSERT(key->isAtomic() || key->isEmptyUnique());
> 
>     if (!m_keyCount)
>         return nullptr;
>diff --git a/Source/JavaScriptCore/runtime/PropertyName.h b/Source/JavaScriptCore/runtime/PropertyName.h
>index 3074c72e1070133b97b03b1dff4a43de132fc0a6..22a8ff850fe04b6ed400a1edfdbe2bbfddad2e58 100644
>--- a/Source/JavaScriptCore/runtime/PropertyName.h
>+++ b/Source/JavaScriptCore/runtime/PropertyName.h
>@@ -93,7 +93,7 @@ class PropertyName {
>         : m_impl(static_cast<AtomicStringImpl*>(propertyName.uid()))
>     {
>         ASSERT(m_impl);
>-        ASSERT(m_impl->isUnique());
>+        ASSERT(m_impl->isEmptyUnique());
>         ASSERT(m_impl->isAtomic());
>     }
> 
>@@ -104,7 +104,7 @@ class PropertyName {
> 
>     AtomicStringImpl* publicName() const
>     {
>-        return m_impl->isUnique() ? nullptr : m_impl;
>+        return m_impl->isEmptyUnique() ? nullptr : m_impl;
>     }
> 
>     static const uint32_t NotAnIndex = UINT_MAX;
>diff --git a/Source/JavaScriptCore/runtime/SmallStrings.h b/Source/JavaScriptCore/runtime/SmallStrings.h
>index fd2b76a00befb665ba4f8e8ce512d38250d7640a..31b39f0282c0227b3c7320acfebb17948b6472b8 100644
>--- a/Source/JavaScriptCore/runtime/SmallStrings.h
>+++ b/Source/JavaScriptCore/runtime/SmallStrings.h
>@@ -38,7 +38,6 @@
>     macro(object) \
>     macro(undefined) \
>     macro(string) \
>-    macro(symbol) \
>     macro(true)
> 
> namespace WTF {
>diff --git a/Source/JavaScriptCore/runtime/StringConstructor.cpp b/Source/JavaScriptCore/runtime/StringConstructor.cpp
>index becacbe6559062ceff3b4fdd41aaf9849a341054..4bae9047a32e778bd1cc192f992bc1da32450cbf 100644
>--- a/Source/JavaScriptCore/runtime/StringConstructor.cpp
>+++ b/Source/JavaScriptCore/runtime/StringConstructor.cpp
>@@ -110,10 +110,7 @@ static EncodedJSValue JSC_HOST_CALL callStringConstructor(ExecState* exec)
> {
>     if (!exec->argumentCount())
>         return JSValue::encode(jsEmptyString(exec));
>-    JSValue argument = exec->uncheckedArgument(0);
>-    if (argument.isSymbol())
>-        return JSValue::encode(jsString(exec, asSymbol(argument)->descriptiveString()));
>-    return JSValue::encode(argument.toString(exec));
>+    return JSValue::encode(exec->uncheckedArgument(0).toString(exec));
> }
> 
> CallType StringConstructor::getCallData(JSCell*, CallData& callData)
>diff --git a/Source/JavaScriptCore/runtime/Structure.cpp b/Source/JavaScriptCore/runtime/Structure.cpp
>index c7690513d7aa703b7fb23d15c3f207a5c0eb1d27..6d756121c5bb662792b1531c04f8e5ec26fb7049 100644
>--- a/Source/JavaScriptCore/runtime/Structure.cpp
>+++ b/Source/JavaScriptCore/runtime/Structure.cpp
>@@ -947,7 +947,7 @@ void Structure::getPropertyNamesFromStructure(VM& vm, PropertyNameArray& propert
>     PropertyTable::iterator end = propertyTable()->end();
>     for (PropertyTable::iterator iter = propertyTable()->begin(); iter != end; ++iter) {
>         ASSERT(hasNonEnumerableProperties() || !(iter->attributes & DontEnum));
>-        if (!iter->key->isUnique() && (!(iter->attributes & DontEnum) || shouldIncludeDontEnumProperties(mode))) {
>+        if (!iter->key->isEmptyUnique() && (!(iter->attributes & DontEnum) || shouldIncludeDontEnumProperties(mode))) {
>             if (knownUnique)
>                 propertyNames.addKnownUnique(iter->key);
>             else
>diff --git a/Source/JavaScriptCore/runtime/StructureInlines.h b/Source/JavaScriptCore/runtime/StructureInlines.h
>index f17bc1b17a401c0dc8918c6db8339c5331085230..269292b7d3eac0408ccc79369c64d4e242231fd2 100644
>--- a/Source/JavaScriptCore/runtime/StructureInlines.h
>+++ b/Source/JavaScriptCore/runtime/StructureInlines.h
>@@ -168,8 +168,6 @@ inline JSValue Structure::prototypeForLookup(JSGlobalObject* globalObject) const
> {
>     if (isObject())
>         return m_prototype.get();
>-    if (typeInfo().type() == SymbolType)
>-        return globalObject->symbolPrototype();
> 
>     ASSERT(typeInfo().type() == StringType);
>     return globalObject->stringPrototype();
>diff --git a/Source/JavaScriptCore/runtime/Symbol.cpp b/Source/JavaScriptCore/runtime/Symbol.cpp
>deleted file mode 100644
>index 294f67e176d4384a28903dea55d63693fb21a16e..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/Symbol.cpp
>+++ /dev/null
>@@ -1,105 +0,0 @@
>-/*
>- * Copyright (C) 2012 Apple Inc. All rights reserved.
>- * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- * 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.
>- */
>-
>-#include "config.h"
>-#include "Symbol.h"
>-
>-#include "Error.h"
>-#include "JSCInlines.h"
>-#include "SymbolObject.h"
>-
>-namespace JSC {
>-
>-const ClassInfo Symbol::s_info = { "symbol", nullptr, nullptr, CREATE_METHOD_TABLE(Symbol) };
>-
>-Symbol::Symbol(VM& vm)
>-    : Base(vm, vm.symbolStructure.get())
>-    , m_privateName()
>-{
>-}
>-
>-Symbol::Symbol(VM& vm, const String& string)
>-    : Base(vm, vm.symbolStructure.get())
>-    , m_privateName(string)
>-{
>-}
>-
>-Symbol::Symbol(VM& vm, AtomicStringImpl* uid)
>-    : Base(vm, vm.symbolStructure.get())
>-    , m_privateName(uid)
>-{
>-}
>-
>-inline SymbolObject* SymbolObject::create(VM& vm, JSGlobalObject* globalObject, Symbol* symbol)
>-{
>-    SymbolObject* object = new (NotNull, allocateCell<SymbolObject>(vm.heap)) SymbolObject(vm, globalObject->symbolObjectStructure());
>-    object->finishCreation(vm, symbol);
>-    return object;
>-}
>-
>-JSValue Symbol::toPrimitive(ExecState*, PreferredPrimitiveType) const
>-{
>-    return const_cast<Symbol*>(this);
>-}
>-
>-bool Symbol::toBoolean() const
>-{
>-    return true;
>-}
>-
>-bool Symbol::getPrimitiveNumber(ExecState* exec, double& number, JSValue& result) const
>-{
>-    result = this;
>-    number = toNumber(exec);
>-    return true;
>-}
>-
>-JSObject* Symbol::toObject(ExecState* exec, JSGlobalObject* globalObject) const
>-{
>-    return SymbolObject::create(exec->vm(), globalObject, const_cast<Symbol*>(this));
>-}
>-
>-double Symbol::toNumber(ExecState* exec) const
>-{
>-    throwTypeError(exec);
>-    return 0.0;
>-}
>-
>-void Symbol::destroy(JSCell* cell)
>-{
>-    static_cast<Symbol*>(cell)->Symbol::~Symbol();
>-}
>-
>-String Symbol::descriptiveString() const
>-{
>-    StringBuilder builder;
>-    builder.appendLiteral("Symbol(");
>-    builder.append(privateName().uid());
>-    builder.append(')');
>-    return builder.toString();
>-}
>-
>-} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/Symbol.h b/Source/JavaScriptCore/runtime/Symbol.h
>deleted file mode 100644
>index 27b01fc450ba10986b923ff29d19a3ec4f8fba4d..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/Symbol.h
>+++ /dev/null
>@@ -1,111 +0,0 @@
>-/*
>- * Copyright (C) 2012 Apple Inc. All rights reserved.
>- * Copyright (C) 2014 Apple Inc. All rights reserved.
>- * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- * 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.
>- */
>-
>-#ifndef Symbol_h
>-#define Symbol_h
>-
>-#include "JSCell.h"
>-#include "JSString.h"
>-#include "PrivateName.h"
>-
>-namespace JSC {
>-
>-class Symbol : public JSCell {
>-public:
>-    typedef JSCell Base;
>-
>-    DECLARE_EXPORT_INFO;
>-
>-    static const bool needsDestruction = true;
>-    static const bool hasImmortalStructure = true;
>-
>-    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>-    {
>-        return Structure::create(vm, globalObject, prototype, TypeInfo(SymbolType, StructureFlags), info());
>-    }
>-
>-    static Symbol* create(VM& vm)
>-    {
>-        Symbol* symbol = new (NotNull, allocateCell<Symbol>(vm.heap)) Symbol(vm);
>-        symbol->finishCreation(vm);
>-        return symbol;
>-    }
>-
>-    static Symbol* create(ExecState* exec, JSString* description)
>-    {
>-        VM& vm = exec->vm();
>-        String desc = description->value(exec);
>-        Symbol* symbol = new (NotNull, allocateCell<Symbol>(vm.heap)) Symbol(vm, desc);
>-        symbol->finishCreation(vm);
>-        return symbol;
>-    }
>-
>-    static Symbol* create(VM& vm, AtomicStringImpl* uid)
>-    {
>-        Symbol* symbol = new (NotNull, allocateCell<Symbol>(vm.heap)) Symbol(vm, uid);
>-        symbol->finishCreation(vm);
>-        return symbol;
>-    }
>-
>-    const PrivateName& privateName() const { return m_privateName; }
>-    String descriptiveString() const;
>-
>-    JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;
>-    JS_EXPORT_PRIVATE bool toBoolean() const;
>-    bool getPrimitiveNumber(ExecState*, double& number, JSValue&) const;
>-    JSObject* toObject(ExecState*, JSGlobalObject*) const;
>-    double toNumber(ExecState*) const;
>-
>-protected:
>-    static const unsigned StructureFlags = OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | StructureIsImmortal;
>-
>-    static void destroy(JSCell*);
>-
>-    Symbol(VM&);
>-    Symbol(VM&, const String&);
>-    Symbol(VM&, AtomicStringImpl* uid);
>-
>-    void finishCreation(VM& vm)
>-    {
>-        Base::finishCreation(vm);
>-        ASSERT(inherits(info()));
>-    }
>-
>-    PrivateName m_privateName;
>-};
>-
>-Symbol* asSymbol(JSValue);
>-
>-inline Symbol* asSymbol(JSValue value)
>-{
>-    ASSERT(value.asCell()->isSymbol());
>-    return jsCast<Symbol*>(value.asCell());
>-}
>-
>-} // namespace JSC
>-
>-#endif // Symbol_h
>diff --git a/Source/JavaScriptCore/runtime/SymbolConstructor.cpp b/Source/JavaScriptCore/runtime/SymbolConstructor.cpp
>deleted file mode 100644
>index 99ce686274fd773928ddd59ff1f9caf4eebe211e..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/SymbolConstructor.cpp
>+++ /dev/null
>@@ -1,77 +0,0 @@
>-/*
>- * Copyright (C) 2012 Apple Inc. All rights reserved.
>- * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- * 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.
>- */
>-
>-#include "config.h"
>-#include "SymbolConstructor.h"
>-
>-#include "Error.h"
>-#include "JSCInlines.h"
>-#include "JSGlobalObject.h"
>-#include "SymbolPrototype.h"
>-
>-namespace JSC {
>-
>-STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(SymbolConstructor);
>-
>-const ClassInfo SymbolConstructor::s_info = { "Function", &Base::s_info, 0, CREATE_METHOD_TABLE(SymbolConstructor) };
>-
>-SymbolConstructor::SymbolConstructor(VM& vm, Structure* structure)
>-    : InternalFunction(vm, structure)
>-{
>-}
>-
>-#define INITIALIZE_WELL_KNOWN_SYMBOLS(name) \
>-    putDirectWithoutTransition(vm, Identifier(&vm, #name), Symbol::create(vm, vm.propertyNames->name##PrivateName.impl()), DontEnum | DontDelete | ReadOnly);
>-
>-void SymbolConstructor::finishCreation(VM& vm, SymbolPrototype* prototype)
>-{
>-    Base::finishCreation(vm, prototype->classInfo()->className);
>-    putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
>-    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(0), DontDelete | ReadOnly | DontEnum);
>-
>-    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_WELL_KNOWN_SYMBOLS)
>-}
>-
>-static EncodedJSValue JSC_HOST_CALL callSymbol(ExecState* exec)
>-{
>-    JSValue description = exec->argument(0);
>-    if (description.isUndefined())
>-        return JSValue::encode(Symbol::create(exec->vm()));
>-    return JSValue::encode(Symbol::create(exec, description.toString(exec)));
>-}
>-
>-ConstructType SymbolConstructor::getConstructData(JSCell*, ConstructData&)
>-{
>-    return ConstructTypeNone;
>-}
>-
>-CallType SymbolConstructor::getCallData(JSCell*, CallData& callData)
>-{
>-    callData.native.function = callSymbol;
>-    return CallTypeHost;
>-}
>-
>-} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/SymbolConstructor.h b/Source/JavaScriptCore/runtime/SymbolConstructor.h
>deleted file mode 100644
>index 0ae12d7fdd5c424bb69a26d1dc13ae08084a6839..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/SymbolConstructor.h
>+++ /dev/null
>@@ -1,66 +0,0 @@
>-/*
>- * Copyright (C) 2012 Apple Inc. All rights reserved.
>- * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- * 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.
>- */
>-
>-#ifndef SymbolConstructor_h
>-#define SymbolConstructor_h
>-
>-#include "InternalFunction.h"
>-#include "Symbol.h"
>-
>-namespace JSC {
>-
>-class SymbolPrototype;
>-
>-class SymbolConstructor : public InternalFunction {
>-public:
>-    typedef InternalFunction Base;
>-
>-    static SymbolConstructor* create(VM& vm, Structure* structure, SymbolPrototype* prototype)
>-    {
>-        SymbolConstructor* constructor = new (NotNull, allocateCell<SymbolConstructor>(vm.heap)) SymbolConstructor(vm, structure);
>-        constructor->finishCreation(vm, prototype);
>-        return constructor;
>-    }
>-
>-    DECLARE_INFO;
>-
>-    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>-    {
>-        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
>-    }
>-
>-protected:
>-    void finishCreation(VM&, SymbolPrototype*);
>-
>-private:
>-    SymbolConstructor(VM&, Structure*);
>-    static ConstructType getConstructData(JSCell*, ConstructData&);
>-    static CallType getCallData(JSCell*, CallData&);
>-};
>-
>-} // namespace JSC
>-
>-#endif // SymbolConstructor_h
>diff --git a/Source/JavaScriptCore/runtime/SymbolObject.cpp b/Source/JavaScriptCore/runtime/SymbolObject.cpp
>deleted file mode 100644
>index 9ab7a7ecbade1785929af3c44afbad22c719c3ca..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/SymbolObject.cpp
>+++ /dev/null
>@@ -1,56 +0,0 @@
>-/*
>- * Copyright (C) 2012 Apple Inc. All rights reserved.
>- * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- * 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.
>- */
>-
>-#include "config.h"
>-#include "SymbolObject.h"
>-
>-#include "JSCInlines.h"
>-
>-namespace JSC {
>-
>-STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(SymbolObject);
>-
>-const ClassInfo SymbolObject::s_info = { "Symbol", &JSWrapperObject::s_info, nullptr, CREATE_METHOD_TABLE(SymbolObject) };
>-
>-SymbolObject::SymbolObject(VM& vm, Structure* structure)
>-    : JSWrapperObject(vm, structure)
>-{
>-}
>-
>-void SymbolObject::finishCreation(VM& vm, Symbol* symbol)
>-{
>-    Base::finishCreation(vm);
>-    ASSERT(inherits(info()));
>-    setInternalValue(vm, symbol);
>-}
>-
>-JSValue SymbolObject::defaultValue(const JSObject* object, ExecState*, PreferredPrimitiveType)
>-{
>-    const SymbolObject* symbolObject = jsCast<const SymbolObject*>(object);
>-    return symbolObject->internalValue();
>-}
>-
>-} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/SymbolObject.h b/Source/JavaScriptCore/runtime/SymbolObject.h
>deleted file mode 100644
>index 46a0491702af0749ddce69d3db8bfda19bcfa0d9..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/SymbolObject.h
>+++ /dev/null
>@@ -1,67 +0,0 @@
>-/*
>- *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
>- *  Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
>- *  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- *  This library is free software; you can redistribute it and/or
>- *  modify it under the terms of the GNU Lesser General Public
>- *  License as published by the Free Software Foundation; either
>- *  version 2 of the License, or (at your option) any later version.
>- *
>- *  This library is distributed in the hope that it will be useful,
>- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
>- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>- *  Lesser General Public License for more details.
>- *
>- *  You should have received a copy of the GNU Lesser General Public
>- *  License along with this library; if not, write to the Free Software
>- *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
>- *
>- */
>-
>-#ifndef SymbolObject_h
>-#define SymbolObject_h
>-
>-#include "JSWrapperObject.h"
>-#include "Symbol.h"
>-
>-namespace JSC {
>-
>-class SymbolObject : public JSWrapperObject {
>-public:
>-    typedef JSWrapperObject Base;
>-
>-    static SymbolObject* create(VM& vm, Structure* structure)
>-    {
>-        Symbol* symbol = Symbol::create(vm);
>-        SymbolObject* object = new (NotNull, allocateCell<SymbolObject>(vm.heap)) SymbolObject(vm, structure);
>-        object->finishCreation(vm, symbol);
>-        return object;
>-    }
>-    static SymbolObject* create(VM& vm, Structure* structure, Symbol* symbol)
>-    {
>-        SymbolObject* object = new (NotNull, allocateCell<SymbolObject>(vm.heap)) SymbolObject(vm, structure);
>-        object->finishCreation(vm, symbol);
>-        return object;
>-    }
>-    static SymbolObject* create(VM&, JSGlobalObject*, Symbol*);
>-
>-    DECLARE_EXPORT_INFO;
>-
>-    Symbol* internalValue() const { return asSymbol(JSWrapperObject::internalValue());}
>-
>-    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>-    {
>-        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
>-    }
>-
>-    static JSValue defaultValue(const JSObject*, ExecState*, PreferredPrimitiveType);
>-
>-protected:
>-    JS_EXPORT_PRIVATE void finishCreation(VM&, Symbol*);
>-    JS_EXPORT_PRIVATE SymbolObject(VM&, Structure*);
>-};
>-
>-} // namespace JSC
>-
>-#endif // SymbolObject_h
>diff --git a/Source/JavaScriptCore/runtime/SymbolPrototype.cpp b/Source/JavaScriptCore/runtime/SymbolPrototype.cpp
>deleted file mode 100644
>index b8db16194ee95387f9896c09695392619c745247..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/SymbolPrototype.cpp
>+++ /dev/null
>@@ -1,105 +0,0 @@
>-/*
>- * Copyright (C) 2012 Apple Inc. All rights reserved.
>- * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- * 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.
>- */
>-
>-#include "config.h"
>-#include "SymbolPrototype.h"
>-
>-#include "Error.h"
>-#include "JSCInlines.h"
>-
>-namespace JSC {
>-
>-static EncodedJSValue JSC_HOST_CALL symbolProtoFuncToString(ExecState*);
>-static EncodedJSValue JSC_HOST_CALL symbolProtoFuncValueOf(ExecState*);
>-
>-}
>-
>-#include "SymbolPrototype.lut.h"
>-
>-namespace JSC {
>-
>-const ClassInfo SymbolPrototype::s_info = { "Symbol", &Base::s_info, &symbolPrototypeTable, CREATE_METHOD_TABLE(SymbolPrototype) };
>-
>-/* Source for SymbolPrototype.lut.h
>-@begin symbolPrototypeTable
>-  toString          symbolProtoFuncToString         DontEnum|Function 0
>-  valueOf           symbolProtoFuncValueOf          DontEnum|Function 0
>-@end
>-*/
>-
>-SymbolPrototype::SymbolPrototype(VM& vm, Structure* structure)
>-    : Base(vm, structure)
>-{
>-}
>-
>-void SymbolPrototype::finishCreation(VM& vm)
>-{
>-    Base::finishCreation(vm);
>-    ASSERT(inherits(info()));
>-}
>-
>-bool SymbolPrototype::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
>-{
>-    return getStaticFunctionSlot<Base>(exec, symbolPrototypeTable, jsCast<SymbolPrototype*>(object), propertyName, slot);
>-}
>-
>-// ------------------------------ Functions ---------------------------
>-
>-EncodedJSValue JSC_HOST_CALL symbolProtoFuncToString(ExecState* exec)
>-{
>-    JSValue thisValue = exec->thisValue();
>-    Symbol* symbol = nullptr;
>-    if (thisValue.isSymbol())
>-        symbol = asSymbol(thisValue);
>-    else if (!thisValue.isObject())
>-        return throwVMTypeError(exec);
>-    else {
>-        JSObject* thisObject = asObject(thisValue);
>-        if (!thisObject->inherits(SymbolObject::info()))
>-            return throwVMTypeError(exec);
>-        symbol = asSymbol(jsCast<SymbolObject*>(thisObject)->internalValue());
>-    }
>-
>-    return JSValue::encode(jsString(exec, symbol->descriptiveString()));
>-}
>-
>-EncodedJSValue JSC_HOST_CALL symbolProtoFuncValueOf(ExecState* exec)
>-{
>-    JSValue thisValue = exec->thisValue();
>-    if (thisValue.isSymbol())
>-        return JSValue::encode(thisValue);
>-
>-    if (!thisValue.isObject())
>-        return throwVMTypeError(exec);
>-
>-    JSObject* thisObject = asObject(thisValue);
>-    if (!thisObject->inherits(SymbolObject::info()))
>-        return throwVMTypeError(exec);
>-
>-    return JSValue::encode(jsCast<SymbolObject*>(thisObject)->internalValue());
>-}
>-
>-} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/SymbolPrototype.h b/Source/JavaScriptCore/runtime/SymbolPrototype.h
>deleted file mode 100644
>index 85a93d3bb07235fda1b9c67ee9b497730fafa32d..0000000000000000000000000000000000000000
>--- a/Source/JavaScriptCore/runtime/SymbolPrototype.h
>+++ /dev/null
>@@ -1,66 +0,0 @@
>-/*
>- * Copyright (C) 2012 Apple Inc. All rights reserved.
>- * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
>- *
>- * 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.
>- */
>-
>-#ifndef SymbolPrototype_h
>-#define SymbolPrototype_h
>-
>-#include "Symbol.h"
>-#include "SymbolObject.h"
>-
>-namespace JSC {
>-
>-// In the ES6 spec, Symbol.prototype object is an ordinary JS object, not one of the symbol wrapper object instance.
>-class SymbolPrototype : public JSDestructibleObject {
>-public:
>-    typedef JSDestructibleObject Base;
>-
>-    static SymbolPrototype* create(VM& vm, JSGlobalObject*, Structure* structure)
>-    {
>-        SymbolPrototype* prototype = new (NotNull, allocateCell<SymbolPrototype>(vm.heap)) SymbolPrototype(vm, structure);
>-        prototype->finishCreation(vm);
>-        return prototype;
>-    }
>-
>-    DECLARE_INFO;
>-
>-    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>-    {
>-        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
>-    }
>-
>-protected:
>-    SymbolPrototype(VM&, Structure*);
>-    void finishCreation(VM&);
>-
>-    static const unsigned StructureFlags = OverridesGetOwnPropertySlot | Base::StructureFlags;
>-
>-private:
>-    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
>-};
>-
>-} // namespace JSC
>-
>-#endif // SymbolPrototype_h
>diff --git a/Source/JavaScriptCore/runtime/VM.cpp b/Source/JavaScriptCore/runtime/VM.cpp
>index 0f73540f43596a7246e294242be052a1d4566df8..c532c27798f64a2c7544eca3e9deaa278cdc2e6c 100644
>--- a/Source/JavaScriptCore/runtime/VM.cpp
>+++ b/Source/JavaScriptCore/runtime/VM.cpp
>@@ -220,7 +220,6 @@ static bool enableAssembler(ExecutableAllocator& executableAllocator)
>     programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
>     functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
>     regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
>-    symbolStructure.set(*this, Symbol::createStructure(*this, 0, jsNull()));
>     symbolTableStructure.set(*this, SymbolTable::createStructure(*this, 0, jsNull()));
>     structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
>     sparseArrayValueMapStructure.set(*this, SparseArrayValueMap::createStructure(*this, 0, jsNull()));
>diff --git a/Source/JavaScriptCore/runtime/VM.h b/Source/JavaScriptCore/runtime/VM.h
>index 94c483b723602283ed40da55ded29553a0317825..e87ad95b53c4ebffceffa5aab4c7756e68303dec 100644
>--- a/Source/JavaScriptCore/runtime/VM.h
>+++ b/Source/JavaScriptCore/runtime/VM.h
>@@ -258,7 +258,6 @@ class VM : public ThreadSafeRefCounted<VM> {
>     Strong<Structure> programExecutableStructure;
>     Strong<Structure> functionExecutableStructure;
>     Strong<Structure> regExpStructure;
>-    Strong<Structure> symbolStructure;
>     Strong<Structure> symbolTableStructure;
>     Strong<Structure> structureChainStructure;
>     Strong<Structure> sparseArrayValueMapStructure;
>diff --git a/Source/WTF/wtf/text/AtomicString.h b/Source/WTF/wtf/text/AtomicString.h
>index bae9d362d2751e5a73ce0b1b7e2a411b01837f33..a79076c0ef3431e120f70673067ce3246772b61f 100644
>--- a/Source/WTF/wtf/text/AtomicString.h
>+++ b/Source/WTF/wtf/text/AtomicString.h
>@@ -184,7 +184,7 @@ class AtomicString {
>     ALWAYS_INLINE static RefPtr<StringImpl> add(StringImpl* string)
>     {
>         if (!string || string->isAtomic()) {
>-            ASSERT_WITH_MESSAGE(!string || !string->length() || string->isUnique() || isInAtomicStringTable(string), "The atomic string comes from an other thread!");
>+            ASSERT_WITH_MESSAGE(!string || !string->length() || isInAtomicStringTable(string), "The atomic string comes from an other thread!");
>             return string;
>         }
>         return addSlowCase(*string);
>@@ -198,7 +198,7 @@ class AtomicString {
>     ALWAYS_INLINE static RefPtr<StringImpl> addWithStringTableProvider(StringTableProvider& stringTableProvider, StringImpl* string)
>     {
>         if (!string || string->isAtomic()) {
>-            ASSERT_WITH_MESSAGE(!string || !string->length() || string->isUnique() || isInAtomicStringTable(string), "The atomic string comes from an other thread!");
>+            ASSERT_WITH_MESSAGE(!string || !string->length() || isInAtomicStringTable(string), "The atomic string comes from an other thread!");
>             return string;
>         }
>         return addSlowCase(*stringTableProvider.atomicStringTable(), *string);
>diff --git a/Source/WTF/wtf/text/StringImpl.cpp b/Source/WTF/wtf/text/StringImpl.cpp
>index c249f4d7ffd5dabee164064a621924dcf3457dc8..28a23b42398f98c035c183996357b8260f7bccc2 100644
>--- a/Source/WTF/wtf/text/StringImpl.cpp
>+++ b/Source/WTF/wtf/text/StringImpl.cpp
>@@ -109,7 +109,7 @@ void StringStats::printStats()
> 
>     STRING_STATS_REMOVE_STRING(*this);
> 
>-    if (isAtomic() && length() && !isUnique())
>+    if (isAtomic() && m_length)
>         AtomicString::remove(this);
> 
>     BufferOwnership ownership = bufferOwnership();
>@@ -286,16 +286,6 @@ void StringImpl::destroy(StringImpl* stringImpl)
>     return create(string, length);
> }
> 
>-Ref<StringImpl> StringImpl::createUnique(PassRefPtr<StringImpl> rep)
>-{
>-    unsigned length = rep->length();
>-    if (!length)
>-        return createUniqueEmpty();
>-    Ref<StringImpl> string = createSubstringSharingImpl(rep, 0, length);
>-    string->m_hashAndFlags = hashAndFlagsForUnique(string->m_hashAndFlags);
>-    return string;
>-}
>-
> bool StringImpl::containsOnlyWhitespace()
> {
>     // FIXME: The definition of whitespace here includes a number of characters
>diff --git a/Source/WTF/wtf/text/StringImpl.h b/Source/WTF/wtf/text/StringImpl.h
>index 266b97e4c88667bf1460e7b91bb051c4ba53897b..1fa295c1ad721293f8017b5cb4a0a47c044527ed 100644
>--- a/Source/WTF/wtf/text/StringImpl.h
>+++ b/Source/WTF/wtf/text/StringImpl.h
>@@ -280,7 +280,7 @@ class StringImpl {
>         // We expect m_length to be initialized to 0 as we use it
>         // to represent a null terminated buffer.
>         , m_data8(reinterpret_cast<const LChar*>(&m_length))
>-        , m_hashAndFlags(hashAndFlagsForUnique(s_hashFlag8BitBuffer | BufferInternal))
>+        , m_hashAndFlags(hashAndFlagsForEmptyUnique())
>     {
>         ASSERT(m_data8);
> 
>@@ -378,13 +378,11 @@ class StringImpl {
>         return constructInternal<T>(resultImpl, length);
>     }
> 
>-    ALWAYS_INLINE static Ref<StringImpl> createUniqueEmpty()
>+    static Ref<StringImpl> createEmptyUnique()
>     {
>         return adoptRef(*new StringImpl(CreateEmptyUnique));
>     }
> 
>-    WTF_EXPORT_STRING_API static Ref<StringImpl> createUnique(PassRefPtr<StringImpl> rep);
>-
>     // Reallocate the StringImpl. The originalString must be only owned by the PassRefPtr,
>     // and the buffer ownership must be BufferInternal. Just like the input pointer of realloc(),
>     // the originalString can't be used after this function.
>@@ -394,7 +392,6 @@ class StringImpl {
>     static unsigned flagsOffset() { return OBJECT_OFFSETOF(StringImpl, m_hashAndFlags); }
>     static unsigned flagIs8Bit() { return s_hashFlag8BitBuffer; }
>     static unsigned flagIsAtomic() { return s_hashFlagIsAtomic; }
>-    static unsigned flagIsUnique() { return s_hashFlagIsUnique; }
>     static unsigned dataOffset() { return OBJECT_OFFSETOF(StringImpl, m_data8); }
> 
>     template<typename CharType, size_t inlineCapacity, typename OverflowHandler>
>@@ -454,13 +451,16 @@ class StringImpl {
> 
>     WTF_EXPORT_STRING_API size_t sizeInBytes() const;
> 
>-    bool isUnique() const { return m_hashAndFlags & s_hashFlagIsUnique; }
>+    bool isEmptyUnique() const
>+    {
>+        return !length() && !isStatic();
>+    }
> 
>     bool isAtomic() const { return m_hashAndFlags & s_hashFlagIsAtomic; }
>     void setIsAtomic(bool isAtomic)
>     {
>         ASSERT(!isStatic());
>-        ASSERT(!isUnique());
>+        ASSERT(!isEmptyUnique());
>         if (isAtomic)
>             m_hashAndFlags |= s_hashFlagIsAtomic;
>         else
>@@ -772,18 +772,17 @@ class StringImpl {
>     template <typename CharType> static Ref<StringImpl> reallocateInternal(PassRefPtr<StringImpl>, unsigned, CharType*&);
>     template <typename CharType> static Ref<StringImpl> createInternal(const CharType*, unsigned);
>     WTF_EXPORT_PRIVATE NEVER_INLINE unsigned hashSlowCase() const;
>-    WTF_EXPORT_PRIVATE static unsigned hashAndFlagsForUnique(unsigned flags);
>+    WTF_EXPORT_PRIVATE unsigned hashAndFlagsForEmptyUnique();
> 
>     // The bottom bit in the ref count indicates a static (immortal) string.
>     static const unsigned s_refCountFlagIsStaticString = 0x1;
>     static const unsigned s_refCountIncrement = 0x2; // This allows us to ref / deref without disturbing the static string flag.
> 
>-    // The bottom 7 bits in the hash are flags.
>-    static const unsigned s_flagCount = 7;
>+    // The bottom 6 bits in the hash are flags.
>+    static const unsigned s_flagCount = 6;
>     static const unsigned s_flagMask = (1u << s_flagCount) - 1;
>     COMPILE_ASSERT(s_flagCount <= StringHasher::flagCount, StringHasher_reserves_enough_bits_for_StringImpl_flags);
> 
>-    static const unsigned s_hashFlagIsUnique = 1u << 6;
>     static const unsigned s_hashFlag8BitBuffer = 1u << 5;
>     static const unsigned s_hashFlagIsAtomic = 1u << 4;
>     static const unsigned s_hashFlagDidReportCost = 1u << 3;
>diff --git a/Source/WTF/wtf/text/StringStatics.cpp b/Source/WTF/wtf/text/StringStatics.cpp
>index 65bb6721d743fa1041c292b60f4d0329283d8e51..a234ffd2936e67e6a2fc8eeffae09b74195f37f9 100644
>--- a/Source/WTF/wtf/text/StringStatics.cpp
>+++ b/Source/WTF/wtf/text/StringStatics.cpp
>@@ -47,18 +47,17 @@ StringImpl* StringImpl::empty()
>     return &emptyString.get();
> }
> 
>-// Set the hash early, so that all unique StringImpls have a hash,
>+// Set the hash early, so that all empty unique StringImpls have a hash,
> // and don't use the normal hashing algorithm - the unique nature of these
> // keys means that we don't need them to match any other string (in fact,
> // that's exactly the oposite of what we want!), and the normal hash would
> // lead to lots of conflicts.
>-unsigned StringImpl::hashAndFlagsForUnique(unsigned flags)
>+unsigned StringImpl::hashAndFlagsForEmptyUnique()
> {
>-    static unsigned s_nextHashAndFlagsForUnique = 0;
>-    s_nextHashAndFlagsForUnique += 1 << s_flagCount;
>-    s_nextHashAndFlagsForUnique |= 1 << 31;
>-    unsigned flagsForUnique = (flags & s_flagMask) | s_hashFlagIsAtomic | s_hashFlagIsUnique;
>-    return s_nextHashAndFlagsForUnique | flagsForUnique;
>+    static unsigned s_nextHashAndFlagsForEmptyUnique = BufferInternal | s_hashFlag8BitBuffer | s_hashFlagIsAtomic;
>+    s_nextHashAndFlagsForEmptyUnique += 1 << s_flagCount;
>+    s_nextHashAndFlagsForEmptyUnique |= 1 << 31;
>+    return s_nextHashAndFlagsForEmptyUnique;
> }
> 
> WTF_EXPORTDATA DEFINE_GLOBAL(AtomicString, nullAtom)
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index d5c84abf9724238bfcd9c6b07b7a4afb112f7cbe..76b0be9a556402546784315484dc33904008a56a 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,36 @@
>+2015-02-20  Yusuke Suzuki  <utatane.tea@gmail.com>
>+
>+        REGRESSION(r179429): Can't type comments in Facebook
>+        https://bugs.webkit.org/show_bug.cgi?id=141859
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * js/names-expected.txt: Renamed from LayoutTests/js/symbols-expected.txt.
>+        * js/names.html: Renamed from LayoutTests/js/symbols.html.
>+        * js/script-tests/names.js: Renamed from LayoutTests/js/script-tests/symbols.js.
>+        (forIn):
>+        * js/script-tests/symbol-abstract-equality-comparison.js: Removed.
>+        * js/script-tests/symbol-abstract-relational-comparison.js: Removed.
>+        * js/script-tests/symbol-in-map.js: Removed.
>+        * js/script-tests/symbol-object.js: Removed.
>+        * js/script-tests/symbol-prototype-is-ordinary-object.js: Removed.
>+        * js/script-tests/symbol-strict-equality-comparison.js: Removed.
>+        * js/script-tests/symbol-tostring.js: Removed.
>+        * js/symbol-abstract-equality-comparison-expected.txt: Removed.
>+        * js/symbol-abstract-equality-comparison.html: Removed.
>+        * js/symbol-abstract-relational-comparison-expected.txt: Removed.
>+        * js/symbol-abstract-relational-comparison.html: Removed.
>+        * js/symbol-in-map-expected.txt: Removed.
>+        * js/symbol-in-map.html: Removed.
>+        * js/symbol-object-expected.txt: Removed.
>+        * js/symbol-object.html: Removed.
>+        * js/symbol-prototype-is-ordinary-object-expected.txt: Removed.
>+        * js/symbol-prototype-is-ordinary-object.html: Removed.
>+        * js/symbol-strict-equality-comparison-expected.txt: Removed.
>+        * js/symbol-strict-equality-comparison.html: Removed.
>+        * js/symbol-tostring-expected.txt: Removed.
>+        * js/symbol-tostring.html: Removed.
>+
> 2015-02-20  Zalan Bujtas  <zalan@apple.com>
> 
>         Invalid assert in CompositeEditCommand::insertNodeAfter/insertNodeBefore
>diff --git a/LayoutTests/js/names-expected.txt b/LayoutTests/js/names-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..f12be861636b3891d1856dd78ba69625ae880257
>--- /dev/null
>+++ b/LayoutTests/js/names-expected.txt
>@@ -0,0 +1,25 @@
>+This tests an early experimental implementation of ES6-esque private names.
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS prop in o is false
>+PASS 'prop' in o is false
>+PASS Object.getOwnPropertyNames(o).length is 0
>+PASS forIn(o) is []
>+PASS prop in o is true
>+PASS 'prop' in o is false
>+PASS Object.getOwnPropertyNames(o).length is 0
>+PASS forIn(o) is []
>+PASS o[prop] is 42
>+PASS o['prop'] is 101
>+PASS Object.getOwnPropertyNames(o).length is 1
>+PASS forIn(o) is ["prop"]
>+PASS prop in o is false
>+PASS 'prop' in o is true
>+PASS Object.getOwnPropertyNames(o).length is 1
>+PASS forIn(o) is ["prop"]
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/names.html b/LayoutTests/js/names.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..23aef4a9c613ce8d15962367bf9dbbe996cd6307
>--- /dev/null
>+++ b/LayoutTests/js/names.html
>@@ -0,0 +1,10 @@
>+<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>+<html>
>+<head>
>+<script src="../resources/js-test-pre.js"></script>
>+</head>
>+<body>
>+<script src="script-tests/names.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/script-tests/names.js b/LayoutTests/js/script-tests/names.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..14dc141660babeadb6c52ebc443e9dfad70f51c4
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/names.js
>@@ -0,0 +1,42 @@
>+description(
>+"This tests an early experimental implementation of ES6-esque private names."
>+);
>+
>+function forIn(o)
>+{
>+    var a = [];
>+    for (x in o)
>+        a.push(x);
>+    return a;
>+}
>+
>+var prop = Name("prop");
>+var o = {};
>+
>+shouldBeFalse("prop in o");
>+shouldBeFalse("'prop' in o");
>+shouldBe("Object.getOwnPropertyNames(o).length", '0');
>+shouldBe("forIn(o)", '[]');
>+
>+o[prop] = 42;
>+
>+shouldBeTrue("prop in o");
>+shouldBeFalse("'prop' in o");
>+shouldBe("Object.getOwnPropertyNames(o).length", '0');
>+shouldBe("forIn(o)", '[]');
>+
>+o['prop'] = 101;
>+
>+shouldBe("o[prop]", '42');
>+shouldBe("o['prop']", '101');
>+shouldBe("Object.getOwnPropertyNames(o).length", '1');
>+shouldBe("forIn(o)", '["prop"]');
>+
>+delete o[prop];
>+
>+shouldBeFalse("prop in o");
>+shouldBeTrue("'prop' in o");
>+shouldBe("Object.getOwnPropertyNames(o).length", '1');
>+shouldBe("forIn(o)", '["prop"]');
>+
>+successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbol-abstract-equality-comparison.js b/LayoutTests/js/script-tests/symbol-abstract-equality-comparison.js
>deleted file mode 100644
>index 1118f0f017d9da3b964ca0e7f5d0751f734d039d..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbol-abstract-equality-comparison.js
>+++ /dev/null
>@@ -1,49 +0,0 @@
>-description(
>-"This tests Abstract Equality Comparison results with Symbols."
>-);
>-
>-var symbol = Symbol("Cocoa");
>-var symbolObject = Object(symbol);
>-// Test Abstract Relational Comparison.
>-var relationalOperators = [
>-    "==", "!="
>-];
>-var object = {};
>-var array = [];
>-var date = new Date();
>-
>-function Pair(key, result) {
>-    return [ key, result ];
>-}
>-
>-relationalOperators.forEach(function (op) {
>-    var targets = [
>-        Pair("42", false),
>-        Pair("NaN", false),
>-        Pair("Infinity", false),
>-        Pair("true", false),
>-        Pair("false", false),
>-        Pair("null", false),
>-        Pair("undefined", false),
>-        Pair("'Cappuccino'", false),
>-        Pair("symbol", true),
>-        Pair("Symbol.iterator", false),
>-        Pair("object", false),
>-        Pair("array", false),
>-        Pair("date", false),
>-        Pair("symbolObject", true),
>-        Pair("Symbol('Cocoa')", false),
>-    ];
>-
>-    targets.forEach(function (pair) {
>-        var target = pair[0];
>-        var result = pair[1];
>-        if (op === "!=") {
>-            result = !result;
>-        }
>-        shouldBe(target + " " + op + " symbol", String(result));
>-        shouldBe("symbol " + op + " " + target, String(result));
>-    });
>-});
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbol-abstract-relational-comparison.js b/LayoutTests/js/script-tests/symbol-abstract-relational-comparison.js
>deleted file mode 100644
>index a2e775b126c4a21b3a601c5634057bda9a534cf3..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbol-abstract-relational-comparison.js
>+++ /dev/null
>@@ -1,37 +0,0 @@
>-description(
>-"This tests Abstract Relatioal Comparison results with Symbols."
>-);
>-
>-var symbol = Symbol("Cocoa");
>-// Test Abstract Relational Comparison.
>-var relationalOperators = [
>-    "<", "<=", ">", ">="
>-];
>-var object = {};
>-var array = [];
>-var date = new Date();
>-
>-relationalOperators.forEach(function (op) {
>-    var targets = [
>-        "42",
>-        "NaN",
>-        "Infinity",
>-        "true",
>-        "false",
>-        "null",
>-        "undefined",
>-        "'Cappuccino'",
>-        "symbol",
>-        "Symbol.iterator",
>-        "object",
>-        "array",
>-        "date",
>-    ];
>-
>-    targets.forEach(function (target) {
>-        shouldThrow(target + " " + op + " symbol", "'TypeError: Type error'");
>-        shouldThrow("symbol " + op + " " + target, "'TypeError: Type error'");
>-    });
>-});
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbol-in-map.js b/LayoutTests/js/script-tests/symbol-in-map.js
>deleted file mode 100644
>index f9df40fd7ac9a84bbc4a133b8caf98c2107b8109..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbol-in-map.js
>+++ /dev/null
>@@ -1,43 +0,0 @@
>-description(
>-"This tests Symbols work in ES6 Map."
>-);
>-
>-var symbol = Symbol("Cocoa");
>-var symbol2 = Symbol("Matcha");
>-var map = new Map();
>-
>-map.set(symbol, "Cappuccino");
>-shouldBe("map.size", "1");
>-shouldBeEqualToString("map.get(symbol)", "Cappuccino");
>-shouldBeFalse("map.has(Symbol('Cocoa'))");
>-shouldBe("map.get(Symbol('Cocoa'))", "undefined");
>-shouldBeFalse("map.has('Cocoa')");
>-shouldBe("map.get('Cocoa')", "undefined");
>-shouldBeFalse("map.has(symbol2)");
>-shouldBe("map.get(symbol2)", "undefined");
>-
>-map.set(symbol2, "Kilimanjaro");
>-shouldBe("map.size", "2");
>-shouldBeEqualToString("map.get(symbol)", "Cappuccino");
>-shouldBeEqualToString("map.get(symbol2)", "Kilimanjaro");
>-shouldBeFalse("map.has(Symbol('Matcha'))");
>-shouldBe("map.get(Symbol('Matcha'))", "undefined");
>-shouldBeFalse("map.has('Matcha')");
>-shouldBe("map.get('Matcha')", "undefined");
>-
>-map.delete(symbol2);
>-shouldBeFalse("map.has(symbol2)");
>-shouldBe("map.get(symbol2)", "undefined");
>-shouldBeTrue("map.has(symbol)");
>-shouldBeEqualToString("map.get(symbol)", "Cappuccino");
>-
>-shouldBe("map.size", "1");
>-var key, value;
>-map.forEach(function (v, k) {
>-    key = k;
>-    value = v;
>-});
>-shouldBe("key", "symbol");
>-shouldBeEqualToString("value", "Cappuccino");
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbol-object.js b/LayoutTests/js/script-tests/symbol-object.js
>deleted file mode 100644
>index 077c64e8d0995a0b95edecee231196c47daca14c..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbol-object.js
>+++ /dev/null
>@@ -1,34 +0,0 @@
>-description(
>-"This tests Symbol object behaviors."
>-);
>-
>-// Symbol constructor cannot be called with `new` style.
>-// To create Symbol object, call `Object(symbol)`.
>-shouldThrow("new Symbol", "\"TypeError: function is not a constructor (evaluating 'new Symbol')\"");
>-shouldThrow("new Symbol('Cappuccino')", "\"TypeError: function is not a constructor (evaluating 'new Symbol('Cappuccino')')\"");
>-
>-var symbolObject = Object(Symbol.iterator);
>-shouldBeTrue("symbolObject instanceof Symbol");
>-// Since Symbol object's @@toPrimitive returns Symbol value,
>-// ToString(symbol) will be called.
>-shouldThrow("String(symbolObject)", "'TypeError: Type error'");
>-shouldBeEqualToString("symbolObject.toString()", "Symbol(Symbol.iterator)");
>-
>-var object = {};
>-object[symbolObject] = 42;
>-// ToPropertyKey(symbolObject) will call toPrimitive(symbolObject), and toPrimitive(symbolObject) will return symbol primitive value. As a result, object[symbolObject] equals to object[symbol in the symbolObject].
>-shouldBe("object[symbolObject]", "42");
>-shouldBe("object['Symbol(Symbol.iterator)']", "undefined");
>-shouldBe("object[Symbol.iterator]", "42");
>-
>-var symbol = Symbol("Matcha");
>-object[symbol] = 'Cocoa';
>-shouldBeEqualToString("object[symbol]", "Cocoa");
>-shouldBeEqualToString("object[symbol.valueOf()]", "Cocoa");
>-shouldBeEqualToString("object[Object(symbol)]", "Cocoa");
>-shouldBe("object['Matcha']", "undefined");
>-
>-// ToObject will be called.
>-shouldBe("Symbol.iterator.hello", "undefined");
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbol-prototype-is-ordinary-object.js b/LayoutTests/js/script-tests/symbol-prototype-is-ordinary-object.js
>deleted file mode 100644
>index 9a8186e18e06c3e646eba03df0d75e8e71b48066..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbol-prototype-is-ordinary-object.js
>+++ /dev/null
>@@ -1,8 +0,0 @@
>-description(
>-"This tests that Symbol.prototype object is ordinary object (not Symbol wrapper object)."
>-);
>-
>-shouldThrow("Symbol.prototype.toString.call(Symbol.prototype)", "'TypeError: Type error'");
>-shouldBeEqualToString("Symbol.prototype.toString.call(Symbol.iterator)", "Symbol(Symbol.iterator)");
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbol-strict-equality-comparison.js b/LayoutTests/js/script-tests/symbol-strict-equality-comparison.js
>deleted file mode 100644
>index b26ff60b71171c0125dfe296dfd8bde672611d2d..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbol-strict-equality-comparison.js
>+++ /dev/null
>@@ -1,49 +0,0 @@
>-description(
>-"This tests Strict Equality Comparison results with Symbols."
>-);
>-
>-var symbol = Symbol("Cocoa");
>-var symbolObject = Object(symbol);
>-// Test Abstract Relational Comparison.
>-var relationalOperators = [
>-    "===", "!=="
>-];
>-var object = {};
>-var array = [];
>-var date = new Date();
>-
>-function Pair(key, result) {
>-    return [ key, result ];
>-}
>-
>-relationalOperators.forEach(function (op) {
>-    var targets = [
>-        Pair("42", false),
>-        Pair("NaN", false),
>-        Pair("Infinity", false),
>-        Pair("true", false),
>-        Pair("false", false),
>-        Pair("null", false),
>-        Pair("undefined", false),
>-        Pair("'Cappuccino'", false),
>-        Pair("symbol", true),
>-        Pair("Symbol.iterator", false),
>-        Pair("object", false),
>-        Pair("array", false),
>-        Pair("date", false),
>-        Pair("symbolObject", false),
>-        Pair("Symbol('Cocoa')", false),
>-    ];
>-
>-    targets.forEach(function (pair) {
>-        var target = pair[0];
>-        var result = pair[1];
>-        if (op === "!==") {
>-            result = !result;
>-        }
>-        shouldBe(target + " " + op + " symbol", String(result));
>-        shouldBe("symbol " + op + " " + target, String(result));
>-    });
>-});
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbol-tostring.js b/LayoutTests/js/script-tests/symbol-tostring.js
>deleted file mode 100644
>index 71836da3456d1f2802be1f162314fd48896f6371..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbol-tostring.js
>+++ /dev/null
>@@ -1,14 +0,0 @@
>-description(
>-"This tests that ToString(Symbol) behaviors."
>-);
>-
>-shouldBeEqualToString("String(Symbol.iterator)", "Symbol(Symbol.iterator)");
>-shouldThrow("String(Symbol.prototype)", "'TypeError: Type error'");
>-shouldBeEqualToString("Symbol.prototype.toString.call(Symbol.iterator)", "Symbol(Symbol.iterator)");
>-shouldBeEqualToString("Symbol.prototype.toString.call(Symbol('hello'))", "Symbol(hello)");
>-shouldBeEqualToString("Symbol.prototype.toString.call(Symbol())", "Symbol()");
>-shouldBeEqualToString("Object.prototype.toString.call(Symbol())", "[object Symbol]");
>-shouldBeEqualToString("Object.prototype.toString.call(Symbol.prototype)", "[object Symbol]");
>-shouldBeEqualToString("Object.prototype.toString.call(Symbol)", "[object Function]");
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/symbols.js b/LayoutTests/js/script-tests/symbols.js
>deleted file mode 100644
>index e47a0e2edc535db2f5f70af910ef865fd37d212e..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/script-tests/symbols.js
>+++ /dev/null
>@@ -1,42 +0,0 @@
>-description(
>-"This tests an early experimental implementation of ES6-esque Symbols."
>-);
>-
>-function forIn(o)
>-{
>-    var a = [];
>-    for (x in o)
>-        a.push(x);
>-    return a;
>-}
>-
>-var prop = Symbol("prop");
>-var o = {};
>-
>-shouldBeFalse("prop in o");
>-shouldBeFalse("'prop' in o");
>-shouldBe("Object.getOwnPropertyNames(o).length", '0');
>-shouldBe("forIn(o)", '[]');
>-
>-o[prop] = 42;
>-
>-shouldBeTrue("prop in o");
>-shouldBeFalse("'prop' in o");
>-shouldBe("Object.getOwnPropertyNames(o).length", '0');
>-shouldBe("forIn(o)", '[]');
>-
>-o['prop'] = 101;
>-
>-shouldBe("o[prop]", '42');
>-shouldBe("o['prop']", '101');
>-shouldBe("Object.getOwnPropertyNames(o).length", '1');
>-shouldBe("forIn(o)", '["prop"]');
>-
>-delete o[prop];
>-
>-shouldBeFalse("prop in o");
>-shouldBeTrue("'prop' in o");
>-shouldBe("Object.getOwnPropertyNames(o).length", '1');
>-shouldBe("forIn(o)", '["prop"]');
>-
>-successfullyParsed = true;
>diff --git a/LayoutTests/js/symbol-abstract-equality-comparison-expected.txt b/LayoutTests/js/symbol-abstract-equality-comparison-expected.txt
>deleted file mode 100644
>index 062b07e822992a049d783c0d124b2f0eadac84f3..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-abstract-equality-comparison-expected.txt
>+++ /dev/null
>@@ -1,69 +0,0 @@
>-This tests Abstract Equality Comparison results with Symbols.
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS 42 == symbol is false
>-PASS symbol == 42 is false
>-PASS NaN == symbol is false
>-PASS symbol == NaN is false
>-PASS Infinity == symbol is false
>-PASS symbol == Infinity is false
>-PASS true == symbol is false
>-PASS symbol == true is false
>-PASS false == symbol is false
>-PASS symbol == false is false
>-PASS null == symbol is false
>-PASS symbol == null is false
>-PASS undefined == symbol is false
>-PASS symbol == undefined is false
>-PASS 'Cappuccino' == symbol is false
>-PASS symbol == 'Cappuccino' is false
>-PASS symbol == symbol is true
>-PASS symbol == symbol is true
>-PASS Symbol.iterator == symbol is false
>-PASS symbol == Symbol.iterator is false
>-PASS object == symbol is false
>-PASS symbol == object is false
>-PASS array == symbol is false
>-PASS symbol == array is false
>-PASS date == symbol is false
>-PASS symbol == date is false
>-PASS symbolObject == symbol is true
>-PASS symbol == symbolObject is true
>-PASS Symbol('Cocoa') == symbol is false
>-PASS symbol == Symbol('Cocoa') is false
>-PASS 42 != symbol is true
>-PASS symbol != 42 is true
>-PASS NaN != symbol is true
>-PASS symbol != NaN is true
>-PASS Infinity != symbol is true
>-PASS symbol != Infinity is true
>-PASS true != symbol is true
>-PASS symbol != true is true
>-PASS false != symbol is true
>-PASS symbol != false is true
>-PASS null != symbol is true
>-PASS symbol != null is true
>-PASS undefined != symbol is true
>-PASS symbol != undefined is true
>-PASS 'Cappuccino' != symbol is true
>-PASS symbol != 'Cappuccino' is true
>-PASS symbol != symbol is false
>-PASS symbol != symbol is false
>-PASS Symbol.iterator != symbol is true
>-PASS symbol != Symbol.iterator is true
>-PASS object != symbol is true
>-PASS symbol != object is true
>-PASS array != symbol is true
>-PASS symbol != array is true
>-PASS date != symbol is true
>-PASS symbol != date is true
>-PASS symbolObject != symbol is false
>-PASS symbol != symbolObject is false
>-PASS Symbol('Cocoa') != symbol is true
>-PASS symbol != Symbol('Cocoa') is true
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbol-abstract-equality-comparison.html b/LayoutTests/js/symbol-abstract-equality-comparison.html
>deleted file mode 100644
>index e40a3068c6e48c32a299b57a14480d38e3206307..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-abstract-equality-comparison.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbol-abstract-equality-comparison.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>
>diff --git a/LayoutTests/js/symbol-abstract-relational-comparison-expected.txt b/LayoutTests/js/symbol-abstract-relational-comparison-expected.txt
>deleted file mode 100644
>index 79071d3111d2400218730400ae98b288e07ce214..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-abstract-relational-comparison-expected.txt
>+++ /dev/null
>@@ -1,113 +0,0 @@
>-This tests Abstract Relatioal Comparison results with Symbols.
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS 42 < symbol threw exception TypeError: Type error.
>-PASS symbol < 42 threw exception TypeError: Type error.
>-PASS NaN < symbol threw exception TypeError: Type error.
>-PASS symbol < NaN threw exception TypeError: Type error.
>-PASS Infinity < symbol threw exception TypeError: Type error.
>-PASS symbol < Infinity threw exception TypeError: Type error.
>-PASS true < symbol threw exception TypeError: Type error.
>-PASS symbol < true threw exception TypeError: Type error.
>-PASS false < symbol threw exception TypeError: Type error.
>-PASS symbol < false threw exception TypeError: Type error.
>-PASS null < symbol threw exception TypeError: Type error.
>-PASS symbol < null threw exception TypeError: Type error.
>-PASS undefined < symbol threw exception TypeError: Type error.
>-PASS symbol < undefined threw exception TypeError: Type error.
>-PASS 'Cappuccino' < symbol threw exception TypeError: Type error.
>-PASS symbol < 'Cappuccino' threw exception TypeError: Type error.
>-PASS symbol < symbol threw exception TypeError: Type error.
>-PASS symbol < symbol threw exception TypeError: Type error.
>-PASS Symbol.iterator < symbol threw exception TypeError: Type error.
>-PASS symbol < Symbol.iterator threw exception TypeError: Type error.
>-PASS object < symbol threw exception TypeError: Type error.
>-PASS symbol < object threw exception TypeError: Type error.
>-PASS array < symbol threw exception TypeError: Type error.
>-PASS symbol < array threw exception TypeError: Type error.
>-PASS date < symbol threw exception TypeError: Type error.
>-PASS symbol < date threw exception TypeError: Type error.
>-PASS 42 <= symbol threw exception TypeError: Type error.
>-PASS symbol <= 42 threw exception TypeError: Type error.
>-PASS NaN <= symbol threw exception TypeError: Type error.
>-PASS symbol <= NaN threw exception TypeError: Type error.
>-PASS Infinity <= symbol threw exception TypeError: Type error.
>-PASS symbol <= Infinity threw exception TypeError: Type error.
>-PASS true <= symbol threw exception TypeError: Type error.
>-PASS symbol <= true threw exception TypeError: Type error.
>-PASS false <= symbol threw exception TypeError: Type error.
>-PASS symbol <= false threw exception TypeError: Type error.
>-PASS null <= symbol threw exception TypeError: Type error.
>-PASS symbol <= null threw exception TypeError: Type error.
>-PASS undefined <= symbol threw exception TypeError: Type error.
>-PASS symbol <= undefined threw exception TypeError: Type error.
>-PASS 'Cappuccino' <= symbol threw exception TypeError: Type error.
>-PASS symbol <= 'Cappuccino' threw exception TypeError: Type error.
>-PASS symbol <= symbol threw exception TypeError: Type error.
>-PASS symbol <= symbol threw exception TypeError: Type error.
>-PASS Symbol.iterator <= symbol threw exception TypeError: Type error.
>-PASS symbol <= Symbol.iterator threw exception TypeError: Type error.
>-PASS object <= symbol threw exception TypeError: Type error.
>-PASS symbol <= object threw exception TypeError: Type error.
>-PASS array <= symbol threw exception TypeError: Type error.
>-PASS symbol <= array threw exception TypeError: Type error.
>-PASS date <= symbol threw exception TypeError: Type error.
>-PASS symbol <= date threw exception TypeError: Type error.
>-PASS 42 > symbol threw exception TypeError: Type error.
>-PASS symbol > 42 threw exception TypeError: Type error.
>-PASS NaN > symbol threw exception TypeError: Type error.
>-PASS symbol > NaN threw exception TypeError: Type error.
>-PASS Infinity > symbol threw exception TypeError: Type error.
>-PASS symbol > Infinity threw exception TypeError: Type error.
>-PASS true > symbol threw exception TypeError: Type error.
>-PASS symbol > true threw exception TypeError: Type error.
>-PASS false > symbol threw exception TypeError: Type error.
>-PASS symbol > false threw exception TypeError: Type error.
>-PASS null > symbol threw exception TypeError: Type error.
>-PASS symbol > null threw exception TypeError: Type error.
>-PASS undefined > symbol threw exception TypeError: Type error.
>-PASS symbol > undefined threw exception TypeError: Type error.
>-PASS 'Cappuccino' > symbol threw exception TypeError: Type error.
>-PASS symbol > 'Cappuccino' threw exception TypeError: Type error.
>-PASS symbol > symbol threw exception TypeError: Type error.
>-PASS symbol > symbol threw exception TypeError: Type error.
>-PASS Symbol.iterator > symbol threw exception TypeError: Type error.
>-PASS symbol > Symbol.iterator threw exception TypeError: Type error.
>-PASS object > symbol threw exception TypeError: Type error.
>-PASS symbol > object threw exception TypeError: Type error.
>-PASS array > symbol threw exception TypeError: Type error.
>-PASS symbol > array threw exception TypeError: Type error.
>-PASS date > symbol threw exception TypeError: Type error.
>-PASS symbol > date threw exception TypeError: Type error.
>-PASS 42 >= symbol threw exception TypeError: Type error.
>-PASS symbol >= 42 threw exception TypeError: Type error.
>-PASS NaN >= symbol threw exception TypeError: Type error.
>-PASS symbol >= NaN threw exception TypeError: Type error.
>-PASS Infinity >= symbol threw exception TypeError: Type error.
>-PASS symbol >= Infinity threw exception TypeError: Type error.
>-PASS true >= symbol threw exception TypeError: Type error.
>-PASS symbol >= true threw exception TypeError: Type error.
>-PASS false >= symbol threw exception TypeError: Type error.
>-PASS symbol >= false threw exception TypeError: Type error.
>-PASS null >= symbol threw exception TypeError: Type error.
>-PASS symbol >= null threw exception TypeError: Type error.
>-PASS undefined >= symbol threw exception TypeError: Type error.
>-PASS symbol >= undefined threw exception TypeError: Type error.
>-PASS 'Cappuccino' >= symbol threw exception TypeError: Type error.
>-PASS symbol >= 'Cappuccino' threw exception TypeError: Type error.
>-PASS symbol >= symbol threw exception TypeError: Type error.
>-PASS symbol >= symbol threw exception TypeError: Type error.
>-PASS Symbol.iterator >= symbol threw exception TypeError: Type error.
>-PASS symbol >= Symbol.iterator threw exception TypeError: Type error.
>-PASS object >= symbol threw exception TypeError: Type error.
>-PASS symbol >= object threw exception TypeError: Type error.
>-PASS array >= symbol threw exception TypeError: Type error.
>-PASS symbol >= array threw exception TypeError: Type error.
>-PASS date >= symbol threw exception TypeError: Type error.
>-PASS symbol >= date threw exception TypeError: Type error.
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbol-abstract-relational-comparison.html b/LayoutTests/js/symbol-abstract-relational-comparison.html
>deleted file mode 100644
>index 01b8bd35ddb1a888a8ba1fabfe2baf5f11dc7202..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-abstract-relational-comparison.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbol-abstract-relational-comparison.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>
>diff --git a/LayoutTests/js/symbol-in-map-expected.txt b/LayoutTests/js/symbol-in-map-expected.txt
>deleted file mode 100644
>index ed65e3b66806c58bf7b934136f48dcef156eccc1..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-in-map-expected.txt
>+++ /dev/null
>@@ -1,31 +0,0 @@
>-This tests Symbols work in ES6 Map.
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS map.size is 1
>-PASS map.get(symbol) is "Cappuccino"
>-PASS map.has(Symbol('Cocoa')) is false
>-PASS map.get(Symbol('Cocoa')) is undefined
>-PASS map.has('Cocoa') is false
>-PASS map.get('Cocoa') is undefined
>-PASS map.has(symbol2) is false
>-PASS map.get(symbol2) is undefined
>-PASS map.size is 2
>-PASS map.get(symbol) is "Cappuccino"
>-PASS map.get(symbol2) is "Kilimanjaro"
>-PASS map.has(Symbol('Matcha')) is false
>-PASS map.get(Symbol('Matcha')) is undefined
>-PASS map.has('Matcha') is false
>-PASS map.get('Matcha') is undefined
>-PASS map.has(symbol2) is false
>-PASS map.get(symbol2) is undefined
>-PASS map.has(symbol) is true
>-PASS map.get(symbol) is "Cappuccino"
>-PASS map.size is 1
>-PASS key is symbol
>-PASS value is "Cappuccino"
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbol-in-map.html b/LayoutTests/js/symbol-in-map.html
>deleted file mode 100644
>index 2bc15927a1ef3b55df18d16463fd0e40018f6def..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-in-map.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbol-in-map.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>
>diff --git a/LayoutTests/js/symbol-object-expected.txt b/LayoutTests/js/symbol-object-expected.txt
>deleted file mode 100644
>index 3d59d98d23682d4ebb7cdb68cfeb36edd4c08588..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-object-expected.txt
>+++ /dev/null
>@@ -1,22 +0,0 @@
>-This tests Symbol object behaviors.
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS new Symbol threw exception TypeError: function is not a constructor (evaluating 'new Symbol').
>-PASS new Symbol('Cappuccino') threw exception TypeError: function is not a constructor (evaluating 'new Symbol('Cappuccino')').
>-PASS symbolObject instanceof Symbol is true
>-PASS String(symbolObject) threw exception TypeError: Type error.
>-PASS symbolObject.toString() is "Symbol(Symbol.iterator)"
>-PASS object[symbolObject] is 42
>-PASS object['Symbol(Symbol.iterator)'] is undefined
>-PASS object[Symbol.iterator] is 42
>-PASS object[symbol] is "Cocoa"
>-PASS object[symbol.valueOf()] is "Cocoa"
>-PASS object[Object(symbol)] is "Cocoa"
>-PASS object['Matcha'] is undefined
>-PASS Symbol.iterator.hello is undefined
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbol-object.html b/LayoutTests/js/symbol-object.html
>deleted file mode 100644
>index 57109042877b1ed3e70baa395409d92af36a5e62..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-object.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbol-object.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>
>diff --git a/LayoutTests/js/symbol-prototype-is-ordinary-object-expected.txt b/LayoutTests/js/symbol-prototype-is-ordinary-object-expected.txt
>deleted file mode 100644
>index 8ff3c2b8bcccf6e635fc50f713354cd25bc53c2c..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-prototype-is-ordinary-object-expected.txt
>+++ /dev/null
>@@ -1,11 +0,0 @@
>-This tests that Symbol.prototype object is ordinary object (not Symbol wrapper object).
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS Symbol.prototype.toString.call(Symbol.prototype) threw exception TypeError: Type error.
>-PASS Symbol.prototype.toString.call(Symbol.iterator) is "Symbol(Symbol.iterator)"
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbol-prototype-is-ordinary-object.html b/LayoutTests/js/symbol-prototype-is-ordinary-object.html
>deleted file mode 100644
>index a2b100a1a31f31d7c033477db34fc62c2a3cce66..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-prototype-is-ordinary-object.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbol-prototype-is-ordinary-object.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>
>diff --git a/LayoutTests/js/symbol-strict-equality-comparison-expected.txt b/LayoutTests/js/symbol-strict-equality-comparison-expected.txt
>deleted file mode 100644
>index 9970ca985012d264626e63e5766ad0d02a15f900..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-strict-equality-comparison-expected.txt
>+++ /dev/null
>@@ -1,69 +0,0 @@
>-This tests Strict Equality Comparison results with Symbols.
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS 42 === symbol is false
>-PASS symbol === 42 is false
>-PASS NaN === symbol is false
>-PASS symbol === NaN is false
>-PASS Infinity === symbol is false
>-PASS symbol === Infinity is false
>-PASS true === symbol is false
>-PASS symbol === true is false
>-PASS false === symbol is false
>-PASS symbol === false is false
>-PASS null === symbol is false
>-PASS symbol === null is false
>-PASS undefined === symbol is false
>-PASS symbol === undefined is false
>-PASS 'Cappuccino' === symbol is false
>-PASS symbol === 'Cappuccino' is false
>-PASS symbol === symbol is true
>-PASS symbol === symbol is true
>-PASS Symbol.iterator === symbol is false
>-PASS symbol === Symbol.iterator is false
>-PASS object === symbol is false
>-PASS symbol === object is false
>-PASS array === symbol is false
>-PASS symbol === array is false
>-PASS date === symbol is false
>-PASS symbol === date is false
>-PASS symbolObject === symbol is false
>-PASS symbol === symbolObject is false
>-PASS Symbol('Cocoa') === symbol is false
>-PASS symbol === Symbol('Cocoa') is false
>-PASS 42 !== symbol is true
>-PASS symbol !== 42 is true
>-PASS NaN !== symbol is true
>-PASS symbol !== NaN is true
>-PASS Infinity !== symbol is true
>-PASS symbol !== Infinity is true
>-PASS true !== symbol is true
>-PASS symbol !== true is true
>-PASS false !== symbol is true
>-PASS symbol !== false is true
>-PASS null !== symbol is true
>-PASS symbol !== null is true
>-PASS undefined !== symbol is true
>-PASS symbol !== undefined is true
>-PASS 'Cappuccino' !== symbol is true
>-PASS symbol !== 'Cappuccino' is true
>-PASS symbol !== symbol is false
>-PASS symbol !== symbol is false
>-PASS Symbol.iterator !== symbol is true
>-PASS symbol !== Symbol.iterator is true
>-PASS object !== symbol is true
>-PASS symbol !== object is true
>-PASS array !== symbol is true
>-PASS symbol !== array is true
>-PASS date !== symbol is true
>-PASS symbol !== date is true
>-PASS symbolObject !== symbol is true
>-PASS symbol !== symbolObject is true
>-PASS Symbol('Cocoa') !== symbol is true
>-PASS symbol !== Symbol('Cocoa') is true
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbol-strict-equality-comparison.html b/LayoutTests/js/symbol-strict-equality-comparison.html
>deleted file mode 100644
>index cba86d6526392550d9f32fe2136abf3b62665db9..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-strict-equality-comparison.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbol-strict-equality-comparison.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>
>diff --git a/LayoutTests/js/symbol-tostring-expected.txt b/LayoutTests/js/symbol-tostring-expected.txt
>deleted file mode 100644
>index be39daf19c2ae3a439e305ccf5f5532e0134a06f..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-tostring-expected.txt
>+++ /dev/null
>@@ -1,17 +0,0 @@
>-This tests that ToString(Symbol) behaviors.
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS String(Symbol.iterator) is "Symbol(Symbol.iterator)"
>-PASS String(Symbol.prototype) threw exception TypeError: Type error.
>-PASS Symbol.prototype.toString.call(Symbol.iterator) is "Symbol(Symbol.iterator)"
>-PASS Symbol.prototype.toString.call(Symbol('hello')) is "Symbol(hello)"
>-PASS Symbol.prototype.toString.call(Symbol()) is "Symbol()"
>-PASS Object.prototype.toString.call(Symbol()) is "[object Symbol]"
>-PASS Object.prototype.toString.call(Symbol.prototype) is "[object Symbol]"
>-PASS Object.prototype.toString.call(Symbol) is "[object Function]"
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbol-tostring.html b/LayoutTests/js/symbol-tostring.html
>deleted file mode 100644
>index bcd176b92444194edd3da4925b2a16f6c593c36e..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbol-tostring.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbol-tostring.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>
>diff --git a/LayoutTests/js/symbols-expected.txt b/LayoutTests/js/symbols-expected.txt
>deleted file mode 100644
>index 0a84e70a00bc2b1d0af80a2a5affd9c059cfb885..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbols-expected.txt
>+++ /dev/null
>@@ -1,25 +0,0 @@
>-This tests an early experimental implementation of ES6-esque Symbols.
>-
>-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>-
>-
>-PASS prop in o is false
>-PASS 'prop' in o is false
>-PASS Object.getOwnPropertyNames(o).length is 0
>-PASS forIn(o) is []
>-PASS prop in o is true
>-PASS 'prop' in o is false
>-PASS Object.getOwnPropertyNames(o).length is 0
>-PASS forIn(o) is []
>-PASS o[prop] is 42
>-PASS o['prop'] is 101
>-PASS Object.getOwnPropertyNames(o).length is 1
>-PASS forIn(o) is ["prop"]
>-PASS prop in o is false
>-PASS 'prop' in o is true
>-PASS Object.getOwnPropertyNames(o).length is 1
>-PASS forIn(o) is ["prop"]
>-PASS successfullyParsed is true
>-
>-TEST COMPLETE
>-
>diff --git a/LayoutTests/js/symbols.html b/LayoutTests/js/symbols.html
>deleted file mode 100644
>index 4113455ea87725393c76cfee2b23876d52e595b1..0000000000000000000000000000000000000000
>--- a/LayoutTests/js/symbols.html
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
>-<html>
>-<head>
>-<script src="../resources/js-test-pre.js"></script>
>-</head>
>-<body>
>-<script src="script-tests/symbols.js"></script>
>-<script src="../resources/js-test-post.js"></script>
>-</body>
>-</html>

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Attachments on bug 141859: 247012 | 247022 | 247029 | 247043 | 247045 | 247113 | 247117 | 247120 | 247127 | 247208 | 247209 | 247210