Attachment 256831 Details for Bug 144956 – Patch

[patch] Patch

bug-144956-20150715134719.patch (text/plain), 108.99 KB, created by GSkachkov on 2015-07-15 03:48:27 PDT

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Creator: GSkachkov

Created: 2015-07-15 03:48:27 PDT

Size: 108.99 KB

patch

obsolete

>Subversion Revision: 186806
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 80db3baf7bae4da820f781ff877e5f9f8e777f05..d43d78162696269f17dbb34ced0259c45f782921 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,127 @@
>+2015-07-15 Aleksandr Skachkov   <gskachkov@gmail.com>
>+
>+        [ES6] Implement ES6 arrow function syntax. Arrow function specific features. Lexical bind of this
>+        https://bugs.webkit.org/show_bug.cgi?id=144956
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Added support of ES6 arrow function specific feature, lexical bind of this and no constructor. http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax
>+        In patch were implemented the following cases:
>+this - variable this is point to the this of the function where arrow function is declared
>+constructor - the using of the command new for arrow function leads to runtime error.
>+
>+        * CMakeLists.txt:
>+        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
>+        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
>+        * JavaScriptCore.xcodeproj/project.pbxproj:
>+        * bytecode/BytecodeList.json:
>+        * bytecode/BytecodeUseDef.h:
>+        (JSC::computeUsesForBytecodeOffset):
>+        (JSC::computeDefsForBytecodeOffset):
>+        * bytecode/CodeBlock.cpp:
>+        (JSC::CodeBlock::dumpBytecode):
>+        * bytecompiler/BytecodeGenerator.cpp:
>+        (JSC::BytecodeGenerator::emitNewFunctionCommon):
>+        (JSC::BytecodeGenerator::emitNewArrowFunctionExpression):
>+        * bytecompiler/BytecodeGenerator.h:
>+        * bytecompiler/NodesCodegen.cpp:
>+        (JSC::ArrowFuncExprNode::emitBytecode):
>+        * dfg/DFGAbstractInterpreterInlines.h:
>+        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
>+        * dfg/DFGByteCodeParser.cpp:
>+        (JSC::DFG::ByteCodeParser::parseBlock):
>+        * dfg/DFGCapabilities.cpp:
>+        (JSC::DFG::capabilityLevel):
>+        * dfg/DFGClobberize.h:
>+        (JSC::DFG::clobberize):
>+        * dfg/DFGDoesGC.cpp:
>+        (JSC::DFG::doesGC):
>+        * dfg/DFGFixupPhase.cpp:
>+        (JSC::DFG::FixupPhase::fixupNode):
>+        * dfg/DFGNode.h:
>+        (JSC::DFG::Node::hasCellOperand):
>+        * dfg/DFGNodeType.h:
>+        * dfg/DFGPredictionPropagationPhase.cpp:
>+        (JSC::DFG::PredictionPropagationPhase::propagate):
>+        * dfg/DFGSafeToExecute.h:
>+        (JSC::DFG::safeToExecute):
>+        * dfg/DFGSpeculativeJIT.cpp:
>+        (JSC::DFG::SpeculativeJIT::compileNewFunctionCommon):
>+        (JSC::DFG::SpeculativeJIT::compileNewFunction):
>+        * dfg/DFGSpeculativeJIT.h:
>+        (JSC::DFG::SpeculativeJIT::callOperation):
>+        * dfg/DFGSpeculativeJIT32_64.cpp:
>+        (JSC::DFG::SpeculativeJIT::compile):
>+        * dfg/DFGSpeculativeJIT64.cpp:
>+        (JSC::DFG::SpeculativeJIT::compile):
>+        * dfg/DFGStructureRegistrationPhase.cpp:
>+        (JSC::DFG::StructureRegistrationPhase::run):
>+        * ftl/FTLAbstractHeapRepository.cpp:
>+        * ftl/FTLAbstractHeapRepository.h:
>+        * ftl/FTLCapabilities.cpp:
>+        (JSC::FTL::canCompile):
>+        * ftl/FTLIntrinsicRepository.h:
>+        * ftl/FTLLowerDFGToLLVM.cpp:
>+        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
>+        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewArrowFunction):
>+        * interpreter/Interpreter.cpp:
>+        * jit/JIT.cpp:
>+        (JSC::JIT::privateCompileMainPass):
>+        * jit/JIT.h:
>+        * jit/JITInlines.h:
>+        (JSC::JIT::callOperation):
>+        * jit/JITOpcodes.cpp:
>+        (JSC::JIT::emit_op_new_arrow_func_exp):
>+        (JSC::JIT::emitNewFuncExprCommon):
>+        * jit/JITOperations.cpp:
>+        * jit/JITOperations.h:
>+        * llint/LLIntSlowPaths.cpp:
>+        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
>+        * llint/LLIntSlowPaths.h:
>+        * llint/LowLevelInterpreter.asm:
>+        * parser/ASTBuilder.h:
>+        (JSC::ASTBuilder::createArrowFunctionExpr):
>+        * parser/NodeConstructors.h:
>+        (JSC::ArrowFuncExprNode::ArrowFuncExprNode):
>+        * parser/Nodes.h:
>+        (JSC::ExpressionNode::isArrowFuncExprNode):
>+        * runtime/JSArrowFunction.cpp: Added.
>+        (JSC::arrowFunctionCall):
>+        (JSC::JSArrowFunction::destroy):
>+        (JSC::JSArrowFunction::JSArrowFunction):
>+        (JSC::JSArrowFunction::createWithInvalidatedReallocationWatchpoint):
>+        (JSC::JSArrowFunction::create):
>+        (JSC::JSArrowFunction::finishCreation):
>+        (JSC::JSArrowFunction::visitChildren):
>+        (JSC::JSArrowFunction::getConstructData):
>+        * runtime/JSArrowFunction.h: Added.
>+        (JSC::JSArrowFunction::allocationSize):
>+        (JSC::JSArrowFunction::createStructure):
>+        (JSC::JSArrowFunction::arrowFunction):
>+        (JSC::JSArrowFunction::boundThis):
>+        (JSC::JSArrowFunction::offsetOfThisValue):
>+        * runtime/JSGlobalObject.cpp:
>+        (JSC::JSGlobalObject::init):
>+        (JSC::JSGlobalObject::visitChildren):
>+        * runtime/JSGlobalObject.h:
>+        (JSC::JSGlobalObject::arrowFunctionStructure):
>+        * tests/stress/arrowfunction-bound.js: Added.
>+        * tests/stress/arrowfunction-call.js: Added.
>+        * tests/stress/arrowfunction-constructor.js: Added.
>+        * tests/stress/arrowfunction-lexical-arguments.js: Added.
>+        * tests/stress/arrowfunction-lexical-this-1.js: Added.
>+        * tests/stress/arrowfunction-lexical-this-2.js: Added.
>+        * tests/stress/arrowfunction-lexical-this-3.js: Added.
>+        * tests/stress/arrowfunction-lexical-this-4.js: Added.
>+        * tests/stress/arrowfunction-lexical-this-5.js: Added.
>+        * tests/stress/arrowfunction-others.js: Added.
>+        * tests/stress/arrowfunction-run-10-1.js: Added.
>+        * tests/stress/arrowfunction-run-10-2.js: Added.
>+        * tests/stress/arrowfunction-run-10000-1.js: Added.
>+        * tests/stress/arrowfunction-run-10000-2.js: Added.
>+        * tests/stress/arrowfunction-tdz.js: Added.
>+        * tests/stress/arrowfunction-typeof.js: Added.
>+
> 2015-07-13  Matthew Mirman  <mmirman@apple.com>
> 
>         Makes compileArithSub in the DFG ensure that the constant is an int32.
>diff --git a/Source/JavaScriptCore/CMakeLists.txt b/Source/JavaScriptCore/CMakeLists.txt
>index 8ae8665a831cc043378267eb81c48b74521b737e..3174dbd3a694ec305d7d826c41734d94c561f3d8 100644
>--- a/Source/JavaScriptCore/CMakeLists.txt
>+++ b/Source/JavaScriptCore/CMakeLists.txt
>@@ -485,6 +485,7 @@ set(JavaScriptCore_RUNTIME_SOURCES
>     runtime/JSArrayBufferPrototype.cpp
>     runtime/JSArrayBufferView.cpp
>     runtime/JSArrayIterator.cpp
>+    runtime/JSArrowFunction.cpp
>     runtime/JSBoundFunction.cpp
>     runtime/JSCJSValue.cpp
>     runtime/JSCallee.cpp
>diff --git a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj
>index 1c1e5f37ee13ca09c8a1dff6c5ebd414662500f8..7143e2abe19ea2a3a31733f3ac0937e5b20ee002 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj
>+++ b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj
>@@ -744,6 +744,7 @@
>     <ClCompile Include="..\runtime\JSArrayBufferPrototype.cpp" />
>     <ClCompile Include="..\runtime\JSArrayBufferView.cpp" />
>     <ClCompile Include="..\runtime\JSBoundFunction.cpp" />
>+    <ClCompile Include="..\runtime\JSArrowFunction.cpp" />
>     <ClCompile Include="..\runtime\JSCJSValue.cpp" />
>     <ClCompile Include="..\runtime\JSCallee.cpp" />
>     <ClCompile Include="..\runtime\JSCatchScope.cpp" />
>@@ -1550,6 +1551,7 @@
>     <ClInclude Include="..\runtime\JSArrayBufferViewInlines.h" />
>     <ClInclude Include="..\runtime\JSArrayIterator.h" />
>     <ClInclude Include="..\runtime\JSBoundFunction.h" />
>+    <ClCompile Include="..\runtime\JSArrowFunction.h" />
>     <ClInclude Include="..\runtime\JSCInlines.h" />
>     <ClInclude Include="..\runtime\JSCJSValue.h" />
>     <ClInclude Include="..\runtime\JSCJSValueInlines.h" />
>diff --git a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>index a66b830d4aa586b0d3c3bff0eedfab109081f783..23394080e1eff4831b5e0de62c2d05b4b9bfe7a8 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>+++ b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>@@ -2694,6 +2694,9 @@
>     <ClInclude Include="..\runtime\JSArray.h">
>       <Filter>runtime</Filter>
>     </ClInclude>
>+    <ClInclude Include="..\runtime\JSArrowFunction.h">
>+      <Filter>runtime</Filter>
>+    </ClInclude>
>     <ClInclude Include="..\runtime\JSBoundFunction.h">
>       <Filter>runtime</Filter>
>     </ClInclude>
>diff --git a/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj b/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>index 67e8a292405f0ac9ff838cc9a7b28fcc73018372..d4a800ea4126bed1cccfa596400c7f0720531b72 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>+++ b/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>@@ -1123,6 +1123,8 @@
> 		86F3EEBF168CDE930077B92A /* ObjcRuntimeExtras.h in Headers */ = {isa = PBXBuildFile; fileRef = 86F3EEB616855A5B0077B92A /* ObjcRuntimeExtras.h */; };
> 		86FA9E91142BBB2E001773B7 /* JSBoundFunction.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 86FA9E8F142BBB2D001773B7 /* JSBoundFunction.cpp */; };
> 		86FA9E92142BBB2E001773B7 /* JSBoundFunction.h in Headers */ = {isa = PBXBuildFile; fileRef = 86FA9E90142BBB2E001773B7 /* JSBoundFunction.h */; };
>+		8B0F424C1ABD6DE2003917EA /* JSArrowFunction.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 8B0F424B1ABD6DE2003917EA /* JSArrowFunction.cpp */; };
>+		8B0F424C1ABD6DE2003917EA /* JSArrowFunction.h in Sources */ = {isa = PBXBuildFile; fileRef = 8B0F424B1ABD6DE2003917EA /* JSArrowFunction.h */; };
> 		90213E3D123A40C200D422F3 /* MemoryStatistics.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 90213E3B123A40C200D422F3 /* MemoryStatistics.cpp */; };
> 		90213E3E123A40C200D422F3 /* MemoryStatistics.h in Headers */ = {isa = PBXBuildFile; fileRef = 90213E3C123A40C200D422F3 /* MemoryStatistics.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		93052C340FB792190048FDC3 /* ParserArena.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 93052C320FB792190048FDC3 /* ParserArena.cpp */; };
>@@ -2883,6 +2885,8 @@
> 		86F75EFD151C062F007C9BA3 /* RegExpMatchesArray.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = RegExpMatchesArray.cpp; sourceTree = "<group>"; };
> 		86FA9E8F142BBB2D001773B7 /* JSBoundFunction.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSBoundFunction.cpp; sourceTree = "<group>"; };
> 		86FA9E90142BBB2E001773B7 /* JSBoundFunction.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSBoundFunction.h; sourceTree = "<group>"; };
>+		8B0F424A1ABD6D2F003917EA /* JSArrowFunction.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = JSArrowFunction.h; sourceTree = "<group>"; };
>+		8B0F424B1ABD6DE2003917EA /* JSArrowFunction.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSArrowFunction.cpp; sourceTree = "<group>"; };
> 		90213E3B123A40C200D422F3 /* MemoryStatistics.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = MemoryStatistics.cpp; sourceTree = "<group>"; };
> 		90213E3C123A40C200D422F3 /* MemoryStatistics.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MemoryStatistics.h; sourceTree = "<group>"; };
> 		93052C320FB792190048FDC3 /* ParserArena.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ParserArena.cpp; sourceTree = "<group>"; };
>@@ -4495,6 +4499,8 @@
> 				A7BDAEC517F4EA1400F6140C /* JSArrayIterator.h */,
> 				86FA9E8F142BBB2D001773B7 /* JSBoundFunction.cpp */,
> 				86FA9E90142BBB2E001773B7 /* JSBoundFunction.h */,
>+				8B0F424A1ABD6D2F003917EA /* JSArrowFunction.h */,
>+				8B0F424B1ABD6DE2003917EA /* JSArrowFunction.cpp */,
> 				657CF45619BF6662004ACBF2 /* JSCallee.cpp */,
> 				657CF45719BF6662004ACBF2 /* JSCallee.h */,
> 				0FD9497E1A97DB9600E28966 /* JSCatchScope.cpp */,
>@@ -7282,6 +7288,7 @@
> 				0FD8A31B17D51F2200CA2C40 /* FTLOSREntry.cpp in Sources */,
> 				0F235BDC17178E1C00690C7F /* FTLOSRExit.cpp in Sources */,
> 				0F235BDF17178E1C00690C7F /* FTLOSRExitCompiler.cpp in Sources */,
>+				8B0F424C1ABD6DE2003917EA /* JSArrowFunction.cpp in Sources */,
> 				0FEA0A2A1709629600BB722C /* FTLOutput.cpp in Sources */,
> 				0F485329187DFDEC0083B687 /* FTLRecoveryOpcode.cpp in Sources */,
> 				0F6B1CC31862C47800845D97 /* FTLRegisterAtOffset.cpp in Sources */,
>diff --git a/Source/JavaScriptCore/bytecode/BytecodeList.json b/Source/JavaScriptCore/bytecode/BytecodeList.json
>index 9a1fdd1be2039ccfa3d26fa1d772ac0f91ad880d..fc9be9f4a94a8f58b915deb6ee9041c1f13cd8bc 100644
>--- a/Source/JavaScriptCore/bytecode/BytecodeList.json
>+++ b/Source/JavaScriptCore/bytecode/BytecodeList.json
>@@ -97,6 +97,7 @@
>             { "name" : "op_switch_string", "length" : 4 },
>             { "name" : "op_new_func", "length" : 4 },
>             { "name" : "op_new_func_exp", "length" : 4 },
>+            { "name" : "op_new_arrow_func_exp", "length" : 5 },
>             { "name" : "op_call", "length" : 9 },
>             { "name" : "op_call_eval", "length" : 9 },
>             { "name" : "op_call_varargs", "length" : 9 },
>diff --git a/Source/JavaScriptCore/bytecode/BytecodeUseDef.h b/Source/JavaScriptCore/bytecode/BytecodeUseDef.h
>index 250d322ce1c0d4239eb7dfd4161f149ce5d8fcc0..40394b5ea1c162232f5b160bbaf339bb535391ec 100644
>--- a/Source/JavaScriptCore/bytecode/BytecodeUseDef.h
>+++ b/Source/JavaScriptCore/bytecode/BytecodeUseDef.h
>@@ -117,6 +117,7 @@ void computeUsesForBytecodeOffset(
>     case op_get_property_enumerator:
>     case op_get_enumerable_length:
>     case op_new_func_exp:
>+    case op_new_arrow_func_exp:
>     case op_to_index_string:
>     case op_init_global_const_nop:
>     case op_init_global_const:
>@@ -310,6 +311,7 @@ void computeDefsForBytecodeOffset(CodeBlock* codeBlock, unsigned bytecodeOffset,
>     case op_new_regexp:
>     case op_new_func:
>     case op_new_func_exp:
>+    case op_new_arrow_func_exp:
>     case op_call_varargs:
>     case op_construct_varargs:
>     case op_get_from_scope:
>diff --git a/Source/JavaScriptCore/bytecode/CodeBlock.cpp b/Source/JavaScriptCore/bytecode/CodeBlock.cpp
>index 3ad75276e2cc9d8bfa745ae193d3fb46ec8b5b6d..cd5f44ae364a4644299145c33a34c0a19d46e6b3 100644
>--- a/Source/JavaScriptCore/bytecode/CodeBlock.cpp
>+++ b/Source/JavaScriptCore/bytecode/CodeBlock.cpp
>@@ -1321,6 +1321,15 @@ void CodeBlock::dumpBytecode(
>             out.printf("%s, %s, f%d", registerName(r0).data(), registerName(r1).data(), f0);
>             break;
>         }
>+        case op_new_arrow_func_exp: {
>+            int r0 = (++it)->u.operand;
>+            int r1 = (++it)->u.operand;
>+            int f0 = (++it)->u.operand;
>+            int r2 = (++it)->u.operand;
>+            printLocationAndOp(out, exec, location, it, "op_new_arrow_func_exp");
>+            out.printf("%s, %s, f%d, %s", registerName(r0).data(), registerName(r1).data(), f0, registerName(r2).data());
>+            break;
>+        }
>         case op_new_func_exp: {
>             int r0 = (++it)->u.operand;
>             int r1 = (++it)->u.operand;
>diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
>index 8b2f8e61fc1e6b06dfdc83fc9471c559f6389bd2..5d9126354c971ece911496c868fe1fc57ab49a7c 100644
>--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
>+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
>@@ -1806,22 +1806,44 @@ RegisterID* BytecodeGenerator::emitNewRegExp(RegisterID* dst, RegExp* regExp)
>     return dst;
> }
> 
>-RegisterID* BytecodeGenerator::emitNewFunctionExpression(RegisterID* r0, FuncExprNode* n)
>+void BytecodeGenerator::emitNewFunctionCommon(RegisterID* dst, FuncExprNode* func, OpcodeID opcodeID)
> {
>-    FunctionBodyNode* function = n->body();
>+    ASSERT(opcodeID == op_new_func_exp || opcodeID == op_new_arrow_func_exp);
>+    
>+    FunctionBodyNode* function = func->body();
>     unsigned index = m_codeBlock->addFunctionExpr(makeFunction(function));
>-
>-    emitOpcode(op_new_func_exp);
>-    instructions().append(r0->index());
>+    
>+    emitOpcode(opcodeID);
>+    instructions().append(dst->index());
>     instructions().append(scopeRegister()->index());
>     instructions().append(index);
>-    return r0;
>+    
>+    if (opcodeID == op_new_arrow_func_exp)
>+        instructions().append(thisRegister()->index());
>+}
>+
>+RegisterID* BytecodeGenerator::emitNewFunctionExpression(RegisterID* dst, FuncExprNode* func)
>+{
>+    emitNewFunctionCommon(dst, func, op_new_func_exp);
>+    return dst;
> }
> 
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
>+RegisterID* BytecodeGenerator::emitNewArrowFunctionExpression(RegisterID* dst, FuncExprNode* func)
>+{
>+    if (m_codeBlock->isConstructor())
>+        emitTDZCheck(thisRegister());
>+    
>+    emitNewFunctionCommon(dst, func, op_new_arrow_func_exp);
>+    return dst;
>+}
>+#endif
>+
> RegisterID* BytecodeGenerator::emitNewDefaultConstructor(RegisterID* dst, ConstructorKind constructorKind, const Identifier& name)
> {
>     UnlinkedFunctionExecutable* executable = m_vm->builtinExecutables()->createDefaultConstructor(constructorKind, name);
> 
>+
>     unsigned index = m_codeBlock->addFunctionExpr(executable);
> 
>     emitOpcode(op_new_func_exp);
>diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
>index 1a9771ef107979c49f51a3943984e63181c84de3..e3839ffe1a6512db8546cb94157fd60608d9ad51 100644
>--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
>+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
>@@ -457,6 +457,11 @@ namespace JSC {
>         RegisterID* emitNewFunctionInternal(RegisterID* dst, unsigned index);
>         RegisterID* emitNewFunctionExpression(RegisterID* dst, FuncExprNode* func);
>         RegisterID* emitNewDefaultConstructor(RegisterID* dst, ConstructorKind, const Identifier& name);
>+        void emitNewFunctionCommon(RegisterID*, FuncExprNode*, OpcodeID);
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
>+        RegisterID* emitNewArrowFunctionExpression(RegisterID*, FuncExprNode*);
>+        RegisterID* emitThisNodeBytecode(RegisterID*, JSTextPosition);
>+#endif
>         RegisterID* emitNewRegExp(RegisterID* dst, RegExp*);
> 
>         RegisterID* emitMoveLinkTimeConstant(RegisterID* dst, LinkTimeConstant);
>diff --git a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
>index cfd3ef1ff6e80752d980d690147c4507507e5f61..1647b01002a214dd3ecc58313aa3abd4462fd7ae 100644
>--- a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
>+++ b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
>@@ -3025,6 +3025,14 @@ RegisterID* FuncExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID*
>     return generator.emitNewFunctionExpression(generator.finalDestination(dst), this);
> }
> 
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)    
>+// ------------------------------ ArrowFuncExprNode ---------------------------------
>+RegisterID* ArrowFuncExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
>+{
>+    return generator.emitNewArrowFunctionExpression(generator.finalDestination(dst), this);
>+}
>+#endif
>+    
> #if ENABLE(ES6_CLASS_SYNTAX)
> // ------------------------------ ClassDeclNode ---------------------------------
> 
>diff --git a/Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h b/Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h
>index 21ee0e4ac2f1656e9a73b7661fb33c8afb3e38da..d8f75ca0ea39a275897bed2dadc6a9af04e5eb75 100644
>--- a/Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h
>+++ b/Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h
>@@ -1627,7 +1627,12 @@ bool AbstractInterpreter<AbstractStateType>::executeEffects(unsigned clobberLimi
>     case CreateClonedArguments:
>         forNode(node).setType(m_graph, SpecObjectOther);
>         break;
>-        
>+            
>+    case NewArrowFunction:
>+        forNode(node).set(
>+            m_graph, m_codeBlock->globalObjectFor(node->origin.semantic)->arrowFunctionStructure());
>+        break;
>+            
>     case NewFunction:
>         forNode(node).set(
>             m_graph, m_codeBlock->globalObjectFor(node->origin.semantic)->functionStructure());
>diff --git a/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp b/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
>index 2e37e697cf8c691b69698cbd5bc760556c40fdff..eee3a2cd6e7e2567b37e39e4abaa2900ad46b44b 100644
>--- a/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
>@@ -3806,6 +3806,17 @@ bool ByteCodeParser::parseBlock(unsigned limit)
>             NEXT_OPCODE(op_new_func_exp);
>         }
> 
>+        case op_new_arrow_func_exp: {
>+            FunctionExecutable* expr = m_inlineStackTop->m_profiledBlock->functionExpr(currentInstruction[3].u.operand);
>+            FrozenValue* frozen = m_graph.freezeStrong(expr);
>+            set(VirtualRegister(currentInstruction[1].u.operand),
>+                addToGraph(NewArrowFunction, OpInfo(frozen),
>+                    get(VirtualRegister(currentInstruction[2].u.operand)),
>+                    get(VirtualRegister(currentInstruction[4].u.operand))));
>+            
>+            NEXT_OPCODE(op_new_arrow_func_exp);
>+        }
>+
>         case op_typeof: {
>             set(VirtualRegister(currentInstruction[1].u.operand),
>                 addToGraph(TypeOf, get(VirtualRegister(currentInstruction[2].u.operand))));
>diff --git a/Source/JavaScriptCore/dfg/DFGCapabilities.cpp b/Source/JavaScriptCore/dfg/DFGCapabilities.cpp
>index ef4c24749b78fa6e09a4c3d9c29013eaa65daa92..be290b3bffc24e145b1335b6d87c9c62006329ce 100644
>--- a/Source/JavaScriptCore/dfg/DFGCapabilities.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGCapabilities.cpp
>@@ -207,6 +207,7 @@ CapabilityLevel capabilityLevel(OpcodeID opcodeID, CodeBlock* codeBlock, Instruc
>     case op_to_index_string:
>     case op_new_func:
>     case op_new_func_exp:
>+    case op_new_arrow_func_exp:
>     case op_create_lexical_environment:
>         return CanCompileAndInline;
> 
>diff --git a/Source/JavaScriptCore/dfg/DFGClobberize.h b/Source/JavaScriptCore/dfg/DFGClobberize.h
>index 5c6d17dcd854fa391e255065686daff09ccbf434..7e40527fda7aecffc7f4d245feaef0802a7ac07e 100644
>--- a/Source/JavaScriptCore/dfg/DFGClobberize.h
>+++ b/Source/JavaScriptCore/dfg/DFGClobberize.h
>@@ -951,7 +951,8 @@ void clobberize(Graph& graph, Node* node, const ReadFunctor& read, const WriteFu
>         read(HeapObjectCount);
>         write(HeapObjectCount);
>         return;
>-        
>+    
>+    case NewArrowFunction:
>     case NewFunction:
>         if (node->castOperand<FunctionExecutable*>()->singletonFunction()->isStillValid())
>             write(Watchpoint_fire);
>diff --git a/Source/JavaScriptCore/dfg/DFGDoesGC.cpp b/Source/JavaScriptCore/dfg/DFGDoesGC.cpp
>index 5946840d2f8809579691c68f96c00d75d15a6b84..675d5f21f16581f5ae44ce2ae7a095a551d1825a 100644
>--- a/Source/JavaScriptCore/dfg/DFGDoesGC.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGDoesGC.cpp
>@@ -230,6 +230,7 @@ bool doesGC(Graph& graph, Node* node)
>     case NewRegexp:
>     case NewStringObject:
>     case MakeRope:
>+    case NewArrowFunction:
>     case NewFunction:
>     case NewTypedArray:
>     case ThrowReferenceError:
>diff --git a/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp b/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
>index 1affa1ab8fe9c1302381e82a1e2ee47a2ffe62c0..793d43144b6a7f5545d6bc516d85ba96f8339279 100644
>--- a/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
>@@ -1262,7 +1262,15 @@ private:
>             fixEdge<CellUse>(node->child1());
>             break;
>         }
>-            
>+
>+        case NewArrowFunction: {
>+            fixEdge<CellUse>(node->child1());
>+            fixEdge<CellUse>(node->child2());
>+            m_insertionSet.insertNode(m_indexInBlock, SpecNone, Check, node->origin,
>+                Edge(node->child2().node(), OtherUse));
>+            break;
>+        }
>+
> #if !ASSERT_DISABLED
>         // Have these no-op cases here to ensure that nobody forgets to add handlers for new opcodes.
>         case SetArgument:
>diff --git a/Source/JavaScriptCore/dfg/DFGNode.h b/Source/JavaScriptCore/dfg/DFGNode.h
>index 50ba1dd290fbaa6efa387d6e2ee86075a950a6da..461729e7454fbb4e34c6b864a2d47ab7052c5691 100644
>--- a/Source/JavaScriptCore/dfg/DFGNode.h
>+++ b/Source/JavaScriptCore/dfg/DFGNode.h
>@@ -1281,6 +1281,7 @@ struct Node {
>         case CheckCell:
>         case NativeConstruct:
>         case NativeCall:
>+        case NewArrowFunction:
>         case NewFunction:
>         case CreateActivation:
>         case MaterializeCreateActivation:
>diff --git a/Source/JavaScriptCore/dfg/DFGNodeType.h b/Source/JavaScriptCore/dfg/DFGNodeType.h
>index 69f6ae5ec996bbc8c9450d3448b0684a829bf690..ccb457b286e464fe78642fa8bc3e81996fb86ccf 100644
>--- a/Source/JavaScriptCore/dfg/DFGNodeType.h
>+++ b/Source/JavaScriptCore/dfg/DFGNodeType.h
>@@ -295,6 +295,8 @@ namespace JSC { namespace DFG {
>     \
>     macro(NewFunction, NodeResultJS) \
>     \
>+    macro(NewArrowFunction, NodeResultJS) \
>+    \
>     /* These aren't terminals but always exit */ \
>     macro(Throw, NodeMustGenerate) \
>     macro(ThrowReferenceError, NodeMustGenerate) \
>diff --git a/Source/JavaScriptCore/dfg/DFGPredictionPropagationPhase.cpp b/Source/JavaScriptCore/dfg/DFGPredictionPropagationPhase.cpp
>index cde09bf121b21f8a4feb60dfa24fb420b6a9baba..9b0be56beda9f037e13b798f639946ca3ce6acfe 100644
>--- a/Source/JavaScriptCore/dfg/DFGPredictionPropagationPhase.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGPredictionPropagationPhase.cpp
>@@ -217,6 +217,7 @@ private:
>         case GetGetter:
>         case GetSetter:
>         case GetCallee:
>+        case NewArrowFunction:
>         case NewFunction: {
>             changed |= setPrediction(SpecFunction);
>             break;
>diff --git a/Source/JavaScriptCore/dfg/DFGSafeToExecute.h b/Source/JavaScriptCore/dfg/DFGSafeToExecute.h
>index 953b54c21f739d07de4645db6b7475c1f07bae61..06c53246a92a1f3dfa5b86a43328c413df166baa 100644
>--- a/Source/JavaScriptCore/dfg/DFGSafeToExecute.h
>+++ b/Source/JavaScriptCore/dfg/DFGSafeToExecute.h
>@@ -230,6 +230,7 @@ bool safeToExecute(AbstractStateType& state, Graph& graph, Node* node)
>     case CreateClonedArguments:
>     case GetFromArguments:
>     case PutToArguments:
>+    case NewArrowFunction:
>     case NewFunction:
>     case Jump:
>     case Branch:
>diff --git a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp
>index 96449953241b30da7e1bffd7c82b3edcf9d48c32..fc2e56d3299e8416edc8f3b75a4a67c14e979573 100644
>--- a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp
>@@ -38,6 +38,7 @@
> #include "DFGSaneStringGetByValSlowPathGenerator.h"
> #include "DFGSlowPathGenerator.h"
> #include "DirectArguments.h"
>+#include "JSArrowFunction.h"
> #include "JSCInlines.h"
> #include "JSEnvironmentRecord.h"
> #include "JSLexicalEnvironment.h"
>@@ -4575,56 +4576,74 @@ void SpeculativeJIT::compileGetArrayLength(Node* node)
>         break;
>     } }
> }
>-
>-void SpeculativeJIT::compileNewFunction(Node* node)
>+    
>+    
>+template <typename ClassType> void SpeculativeJIT::compileNewFunctionCommon(GPRReg resultGPR, Structure* structure, GPRReg scratch1GPR, GPRReg scratch2GPR, GPRReg scopeGPR, MacroAssembler::JumpList& slowPath, size_t size, FunctionExecutable* executable, ptrdiff_t offsetOfScopeChain, ptrdiff_t offsetOfExecutable, ptrdiff_t offsetOfRareData)
>+{
>+    emitAllocateJSObjectWithKnownSize<ClassType>(resultGPR, TrustedImmPtr(structure), TrustedImmPtr(0), scratch1GPR, scratch2GPR, slowPath, size);
>+    
>+    m_jit.storePtr(scopeGPR, JITCompiler::Address(resultGPR, offsetOfScopeChain));
>+    m_jit.storePtr(TrustedImmPtr(executable), JITCompiler::Address(resultGPR, offsetOfExecutable));
>+    m_jit.storePtr(TrustedImmPtr(0), JITCompiler::Address(resultGPR, offsetOfRareData));
>+}
>+    
>+void SpeculativeJIT::compileNewFunction(Node* node, NodeType nodeType)
> {
>+    ASSERT(nodeType == NewFunction || nodeType == NewArrowFunction);
>+    
>     SpeculateCellOperand scope(this, node->child1());
>+    GPRReg thisValueGPR;
>     GPRReg scopeGPR = scope.gpr();
> 
>     FunctionExecutable* executable = node->castOperand<FunctionExecutable*>();
> 
>+    if (nodeType == NewArrowFunction) {
>+        SpeculateCellOperand thisValue(this, node->child2());
>+        thisValueGPR = thisValue.gpr();
>+    }
>+
>     if (executable->singletonFunction()->isStillValid()) {
>         GPRFlushedCallResult result(this);
>         GPRReg resultGPR = result.gpr();
>-
>+        
>         flushRegisters();
>-
>-        callOperation(operationNewFunction, resultGPR, scopeGPR, executable);
>+        
>+        if (nodeType == NewArrowFunction)
>+            callOperation(operationNewArrowFunction, resultGPR, scopeGPR, executable, thisValueGPR);
>+        else
>+            callOperation(operationNewFunction, resultGPR, scopeGPR, executable);
>+        
>         cellResult(resultGPR, node);
>         return;
>     }
> 
>-    Structure* structure = m_jit.graph().globalObjectFor(
>-        node->origin.semantic)->functionStructure();
>-
>+    Structure* structure = nodeType == NewArrowFunction
>+        ? m_jit.graph().globalObjectFor(node->origin.semantic)->arrowFunctionStructure()
>+        : m_jit.graph().globalObjectFor(node->origin.semantic)->functionStructure();
>+    
>     GPRTemporary result(this);
>     GPRTemporary scratch1(this);
>     GPRTemporary scratch2(this);
>+    
>     GPRReg resultGPR = result.gpr();
>     GPRReg scratch1GPR = scratch1.gpr();
>     GPRReg scratch2GPR = scratch2.gpr();
>-
>+    
>     JITCompiler::JumpList slowPath;
>-    emitAllocateJSObjectWithKnownSize<JSFunction>(
>-        resultGPR, TrustedImmPtr(structure), TrustedImmPtr(0),
>-        scratch1GPR, scratch2GPR, slowPath, JSFunction::allocationSize(0));
>-
>-    // Don't need a memory barriers since we just fast-created the function, so it
>-    // must be young.
>-    m_jit.storePtr(
>-        scopeGPR,
>-        JITCompiler::Address(resultGPR, JSFunction::offsetOfScopeChain()));
>-    m_jit.storePtr(
>-        TrustedImmPtr(executable),
>-        JITCompiler::Address(resultGPR, JSFunction::offsetOfExecutable()));
>-    m_jit.storePtr(
>-        TrustedImmPtr(0),
>-        JITCompiler::Address(resultGPR, JSFunction::offsetOfRareData()));
>-
>-
>-    addSlowPathGenerator(
>-        slowPathCall(
>-            slowPath, this, operationNewFunctionWithInvalidatedReallocationWatchpoint, resultGPR, scopeGPR, executable));
>+    
>+    if (nodeType == NewFunction) {
>+        compileNewFunctionCommon<JSFunction>(resultGPR, structure, scratch1GPR, scratch2GPR, scopeGPR, slowPath, JSFunction::allocationSize(0), executable, JSFunction::offsetOfScopeChain(), JSFunction::offsetOfExecutable(), JSFunction::offsetOfRareData());
>+            
>+        addSlowPathGenerator(slowPathCall(slowPath, this, operationNewFunctionWithInvalidatedReallocationWatchpoint, resultGPR, scopeGPR, executable));
>+    }
>+    
>+    if (nodeType == NewArrowFunction) {
>+        compileNewFunctionCommon<JSArrowFunction>(resultGPR, structure, scratch1GPR, scratch2GPR, scopeGPR, slowPath, JSArrowFunction::allocationSize(0), executable, JSArrowFunction::offsetOfScopeChain(), JSArrowFunction::offsetOfExecutable(), JSArrowFunction::offsetOfRareData());
>+        
>+        m_jit.storePtr(thisValueGPR, JITCompiler::Address(resultGPR, JSArrowFunction::offsetOfThisValue()));
>+        
>+        addSlowPathGenerator(slowPathCall(slowPath, this, operationNewArrowFunctionWithInvalidatedReallocationWatchpoint, resultGPR, scopeGPR, executable, thisValueGPR));
>+    }
> 
>     cellResult(resultGPR, node);
> }
>diff --git a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h
>index 8798b6dddedb7bbccb47bbb0f69f111a1ae35cd9..8559c5156e2e6a69d12b965b9bd08d53d34ac466 100644
>--- a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h
>+++ b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h
>@@ -1202,6 +1202,12 @@ public:
>         m_jit.setupArgumentsWithExecState(arg1, TrustedImmPtr(cell));
>         return appendCallWithExceptionCheckSetResult(operation, result);
>     }
>+    
>+    JITCompiler::Call callOperation(J_JITOperation_EJscCJ operation, GPRReg result, GPRReg arg1, JSCell* cell, GPRReg arg2)
>+    {
>+        m_jit.setupArgumentsWithExecState(arg1, TrustedImmPtr(cell), arg2);
>+        return appendCallWithExceptionCheckSetResult(operation, result);
>+    }
> 
>     JITCompiler::Call callOperation(V_JITOperation_EWs operation, WatchpointSet* watchpointSet)
>     {
>@@ -1608,6 +1614,11 @@ public:
>         m_jit.setupArgumentsWithExecState(arg1, TrustedImmPtr(cell));
>         return appendCallWithExceptionCheckSetResult(operation, resultPayload, resultTag);
>     }
>+    JITCompiler::Call callOperation(J_JITOperation_EJscCJ operation, GPRReg resultTag, GPRReg resultPayload, GPRReg arg1, JSCell* cell, GPRReg arg2)
>+    {
>+        m_jit.setupArgumentsWithExecState(arg1, TrustedImmPtr(cell), arg2);
>+        return appendCallWithExceptionCheckSetResult(operation, resultPayload, resultTag);
>+    }
>     JITCompiler::Call callOperation(J_JITOperation_ESsiCI operation, GPRReg resultTag, GPRReg resultPayload, StructureStubInfo* stubInfo, GPRReg arg1, const UniquedStringImpl* uid)
>     {
>         m_jit.setupArgumentsWithExecState(TrustedImmPtr(stubInfo), arg1, TrustedImmPtr(uid));
>@@ -2210,7 +2221,8 @@ public:
>     void compilePutByValForIntTypedArray(GPRReg base, GPRReg property, Node*, TypedArrayType);
>     void compileGetByValOnFloatTypedArray(Node*, TypedArrayType);
>     void compilePutByValForFloatTypedArray(GPRReg base, GPRReg property, Node*, TypedArrayType);
>-    void compileNewFunction(Node*);
>+    template <typename ClassType> void compileNewFunctionCommon(GPRReg, Structure*, GPRReg, GPRReg, GPRReg, MacroAssembler::JumpList&, size_t, FunctionExecutable*, ptrdiff_t, ptrdiff_t, ptrdiff_t);
>+    void compileNewFunction(Node*, NodeType);
>     void compileForwardVarargs(Node*);
>     void compileCreateActivation(Node*);
>     void compileCreateDirectArguments(Node*);
>diff --git a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp
>index 7e08d9bfdb6571a84b243f519fc5ad7dfde55cdc..ab735b730f6e161ce32fcda5fd7dcafe26f3975c 100644
>--- a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp
>@@ -4306,11 +4306,12 @@ void SpeculativeJIT::compile(Node* node)
>         compileCreateClonedArguments(node);
>         break;
>     }
>-        
>+
>     case NewFunction:
>-        compileNewFunction(node);
>+    case NewArrowFunction:
>+        compileNewFunction(node, op);
>         break;
>-        
>+
>     case In:
>         compileIn(node);
>         break;
>diff --git a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp
>index 2c78f9a2213859f7cd8d0ef017e561549f194d78..0359d2dd860531977e88195caee6df3fc9661668 100644
>--- a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp
>@@ -4315,11 +4315,15 @@ void SpeculativeJIT::compile(Node* node)
>         compileCreateClonedArguments(node);
>         break;
>     }
>-        
>+
>+    case NewArrowFunction:
>+        compileNewFunction(node, NewArrowFunction);
>+        break;
>+            
>     case NewFunction:
>-        compileNewFunction(node);
>+        compileNewFunction(node, NewFunction);
>         break;
>-        
>+
>     case In:
>         compileIn(node);
>         break;
>diff --git a/Source/JavaScriptCore/dfg/DFGStructureRegistrationPhase.cpp b/Source/JavaScriptCore/dfg/DFGStructureRegistrationPhase.cpp
>index 875e0d3176787a5bb1699cc26b0df8d25512b972..97f193c0968b5fd890e45f0cf8767bc26cbd3304 100644
>--- a/Source/JavaScriptCore/dfg/DFGStructureRegistrationPhase.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGStructureRegistrationPhase.cpp
>@@ -135,7 +135,9 @@ public:
>                 case NewRegexp:
>                     registerStructure(m_graph.globalObjectFor(node->origin.semantic)->regExpStructure());
>                     break;
>-                    
>+                case NewArrowFunction:
>+                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->arrowFunctionStructure());
>+                    break;
>                 case NewFunction:
>                     registerStructure(m_graph.globalObjectFor(node->origin.semantic)->functionStructure());
>                     break;
>diff --git a/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.cpp b/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.cpp
>index e416fdaafee2229f653b9ae06248000999875a00..3c3864ca180aa36e4808c23a1306be28e5d7b901 100644
>--- a/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.cpp
>+++ b/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.cpp
>@@ -30,6 +30,7 @@
> 
> #include "DirectArguments.h"
> #include "GetterSetter.h"
>+#include "JSArrowFunction.h"
> #include "JSEnvironmentRecord.h"
> #include "JSPropertyNameEnumerator.h"
> #include "JSScope.h"
>diff --git a/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.h b/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.h
>index 912754dfc40152b0ed24836ac75b8f96984399bb..9667f6069ed94f4aed6219de5b1405a27853a7ff 100644
>--- a/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.h
>+++ b/Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.h
>@@ -87,7 +87,11 @@ namespace JSC { namespace FTL {
>     macro(Structure_classInfo, Structure::classInfoOffset()) \
>     macro(Structure_globalObject, Structure::globalObjectOffset()) \
>     macro(Structure_prototype, Structure::prototypeOffset()) \
>-    macro(Structure_structureID, Structure::structureIDOffset())
>+    macro(Structure_structureID, Structure::structureIDOffset())\
>+    macro(JSArrowFunction_executable, JSArrowFunction::offsetOfExecutable()) \
>+    macro(JSArrowFunction_scope, JSArrowFunction::offsetOfScopeChain()) \
>+    macro(JSArrowFunction_rareData, JSArrowFunction::offsetOfRareData()) \
>+    macro(JSArrowFunction_this, JSArrowFunction::offsetOfThisValue())
> 
> #define FOR_EACH_INDEXED_ABSTRACT_HEAP(macro) \
>     macro(DirectArguments_storage, DirectArguments::storageOffset(), sizeof(EncodedJSValue)) \
>diff --git a/Source/JavaScriptCore/ftl/FTLCapabilities.cpp b/Source/JavaScriptCore/ftl/FTLCapabilities.cpp
>index 1fe7987f83d6efa7c2723598d65c39312970fffa..b282d609160ae775089e1b8ab1ee38e84f1212a4 100644
>--- a/Source/JavaScriptCore/ftl/FTLCapabilities.cpp
>+++ b/Source/JavaScriptCore/ftl/FTLCapabilities.cpp
>@@ -105,6 +105,7 @@ inline CapabilityLevel canCompile(Node* node)
>     case LoopHint:
>     case SkipScope:
>     case CreateActivation:
>+    case NewArrowFunction:
>     case NewFunction:
>     case GetClosureVar:
>     case PutClosureVar:
>diff --git a/Source/JavaScriptCore/ftl/FTLIntrinsicRepository.h b/Source/JavaScriptCore/ftl/FTLIntrinsicRepository.h
>index 3e62d302f8e4ca6f99b7db7280863c3b3f07c922..200cb35125910c4bac3f16f26389521577bdde75 100644
>--- a/Source/JavaScriptCore/ftl/FTLIntrinsicRepository.h
>+++ b/Source/JavaScriptCore/ftl/FTLIntrinsicRepository.h
>@@ -86,6 +86,7 @@ namespace JSC { namespace FTL {
>     macro(J_JITOperation_EJI, functionType(int64, intPtr, int64, intPtr)) \
>     macro(J_JITOperation_EJJ, functionType(int64, intPtr, int64, int64)) \
>     macro(J_JITOperation_EJscC, functionType(intPtr, intPtr, intPtr, intPtr)) \
>+    macro(J_JITOperation_EJscCJ, functionType(int64, intPtr, int64, int64, int64))\
>     macro(J_JITOperation_EJssZ, functionType(int64, intPtr, intPtr, int32)) \
>     macro(J_JITOperation_ESsiJI, functionType(int64, intPtr, intPtr, int64, intPtr)) \
>     macro(Jss_JITOperation_EZ, functionType(intPtr, intPtr, int32)) \
>diff --git a/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp b/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp
>index c9dde555122b6240880e7f5aa8503b9e2036f63a..fcf7f83e47999df64966117a6b9d43bfc4949fc7 100644
>--- a/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp
>+++ b/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp
>@@ -44,6 +44,7 @@
> #include "FTLOutput.h"
> #include "FTLThunks.h"
> #include "FTLWeightedTarget.h"
>+#include "JSArrowFunction.h"
> #include "JSCInlines.h"
> #include "JSLexicalEnvironment.h"
> #include "OperandsInlines.h"
>@@ -617,7 +618,8 @@ private:
>             compileCreateActivation();
>             break;
>         case NewFunction:
>-            compileNewFunction();
>+        case NewArrowFunction:
>+            compileNewFunction(m_node->op());
>             break;
>         case CreateDirectArguments:
>             compileCreateDirectArguments();
>@@ -3098,40 +3100,62 @@ private:
>         setJSValue(m_out.phi(m_out.intPtr, fastResult, slowResult));
>     }
>     
>-    void compileNewFunction()
>+    void compileNewFunction(NodeType nodeType)
>     {
>+        ASSERT(nodeType == NewFunction || nodeType == NewArrowFunction);
>+        
>+        bool isArrowFunction = nodeType == NewArrowFunction;
>+        
>         LValue scope = lowCell(m_node->child1());
>+        LValue thisValue = isArrowFunction ? lowJSValue(m_node->child2()) : nullptr;
>+        
>         FunctionExecutable* executable = m_node->castOperand<FunctionExecutable*>();
>         if (executable->singletonFunction()->isStillValid()) {
>-            LValue callResult = vmCall(
>-                m_out.operation(operationNewFunction), m_callFrame, scope, weakPointer(executable));
>+            LValue callResult = isArrowFunction
>+                ? vmCall(m_out.operation(operationNewArrowFunction), m_callFrame, scope, weakPointer(executable), thisValue)
>+                : vmCall(m_out.operation(operationNewFunction), m_callFrame, scope, weakPointer(executable));
>             setJSValue(callResult);
>             return;
>         }
>         
>-        Structure* structure = m_graph.globalObjectFor(m_node->origin.semantic)->functionStructure();
>+        Structure* structure = isArrowFunction
>+            ? m_graph.globalObjectFor(m_node->origin.semantic)->arrowFunctionStructure()
>+            : m_graph.globalObjectFor(m_node->origin.semantic)->functionStructure();
>+        
>+        LBasicBlock slowPath = isArrowFunction
>+            ? FTL_NEW_BLOCK(m_out, ("NewArrowFunction slow path"))
>+            : FTL_NEW_BLOCK(m_out, ("NewFunction slow path"));
>         
>-        LBasicBlock slowPath = FTL_NEW_BLOCK(m_out, ("NewFunction slow path"));
>-        LBasicBlock continuation = FTL_NEW_BLOCK(m_out, ("NewFunction continuation"));
>+        LBasicBlock continuation = isArrowFunction
>+            ? FTL_NEW_BLOCK(m_out, ("NewArrowFunction continuation"))
>+            : FTL_NEW_BLOCK(m_out, ("NewFunction continuation"));
>         
>         LBasicBlock lastNext = m_out.insertNewBlocksBefore(slowPath);
>         
>-        LValue fastObject = allocateObject<JSFunction>(
>-            structure, m_out.intPtrZero, slowPath);
>+        LValue fastObject = isArrowFunction
>+            ? allocateObject<JSArrowFunction>(structure, m_out.intPtrZero, slowPath)
>+            : allocateObject<JSFunction>(structure, m_out.intPtrZero, slowPath);
>+        
>         
>         // We don't need memory barriers since we just fast-created the function, so it
>         // must be young.
>-        m_out.storePtr(scope, fastObject, m_heaps.JSFunction_scope);
>-        m_out.storePtr(weakPointer(executable), fastObject, m_heaps.JSFunction_executable);
>-        m_out.storePtr(m_out.intPtrZero, fastObject, m_heaps.JSFunction_rareData);
>+        m_out.storePtr(scope, fastObject, isArrowFunction ? m_heaps.JSArrowFunction_scope : m_heaps.JSFunction_scope);
>+        m_out.storePtr(weakPointer(executable), fastObject, isArrowFunction ?  m_heaps.JSArrowFunction_executable : m_heaps.JSFunction_executable);
>+        
>+        if (isArrowFunction)
>+            m_out.storePtr(thisValue, fastObject, m_heaps.JSArrowFunction_this);
>+        
>+        m_out.storePtr(m_out.intPtrZero, fastObject, isArrowFunction ?  m_heaps.JSArrowFunction_rareData : m_heaps.JSFunction_rareData);
>         
>         ValueFromBlock fastResult = m_out.anchor(fastObject);
>         m_out.jump(continuation);
>         
>         m_out.appendTo(slowPath, continuation);
>-        LValue callResult = vmCall(
>-            m_out.operation(operationNewFunctionWithInvalidatedReallocationWatchpoint),
>-            m_callFrame, scope, weakPointer(executable));
>+        
>+        LValue callResult = isArrowFunction
>+            ? vmCall(m_out.operation(operationNewArrowFunctionWithInvalidatedReallocationWatchpoint), m_callFrame, scope, weakPointer(executable), thisValue)
>+            : vmCall(m_out.operation(operationNewFunctionWithInvalidatedReallocationWatchpoint), m_callFrame, scope, weakPointer(executable));
>+        
>         ValueFromBlock slowResult = m_out.anchor(callResult);
>         m_out.jump(continuation);
>         
>diff --git a/Source/JavaScriptCore/interpreter/Interpreter.cpp b/Source/JavaScriptCore/interpreter/Interpreter.cpp
>index c997d2c90d3eb01eb90e5828feadfe011b08e2ad..eb0cb312a30c5ce5371babcfea087242734d3cdb 100644
>--- a/Source/JavaScriptCore/interpreter/Interpreter.cpp
>+++ b/Source/JavaScriptCore/interpreter/Interpreter.cpp
>@@ -45,6 +45,7 @@
> #include "ExceptionHelpers.h"
> #include "GetterSetter.h"
> #include "JSArray.h"
>+#include "JSArrowFunction.h"
> #include "JSBoundFunction.h"
> #include "JSCInlines.h"
> #include "JSLexicalEnvironment.h"
>diff --git a/Source/JavaScriptCore/jit/JIT.cpp b/Source/JavaScriptCore/jit/JIT.cpp
>index 23d31da56360889fb87635a5b93950b0232d27b4..1b82b46bfd34ccadc19cd538fe4535842fa982fc 100644
>--- a/Source/JavaScriptCore/jit/JIT.cpp
>+++ b/Source/JavaScriptCore/jit/JIT.cpp
>@@ -260,6 +260,7 @@ void JIT::privateCompileMainPass()
>         DEFINE_OP(op_new_array_buffer)
>         DEFINE_OP(op_new_func)
>         DEFINE_OP(op_new_func_exp)
>+        DEFINE_OP(op_new_arrow_func_exp) 
>         DEFINE_OP(op_new_object)
>         DEFINE_OP(op_new_regexp)
>         DEFINE_OP(op_not)
>diff --git a/Source/JavaScriptCore/jit/JIT.h b/Source/JavaScriptCore/jit/JIT.h
>index 202c99c63559c33d3d093f66f3308ffa8bbe7e2a..c007fff3faea8c4b0456c838d126c1847c6f7530 100644
>--- a/Source/JavaScriptCore/jit/JIT.h
>+++ b/Source/JavaScriptCore/jit/JIT.h
>@@ -176,6 +176,8 @@ namespace JSC {
>     void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
>     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
>     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction);
>+    
>+    enum FunctionType { ArrowFunctionType, StandardFunctionType };
> 
>     class JIT : private JSInterfaceJIT {
>         friend class JITSlowPathCall;
>@@ -521,6 +523,7 @@ namespace JSC {
>         void emit_op_new_array_buffer(Instruction*);
>         void emit_op_new_func(Instruction*);
>         void emit_op_new_func_exp(Instruction*);
>+        void emit_op_new_arrow_func_exp(Instruction*);
>         void emit_op_new_object(Instruction*);
>         void emit_op_new_regexp(Instruction*);
>         void emit_op_not(Instruction*);
>@@ -636,6 +639,7 @@ namespace JSC {
>         void emitRightShift(Instruction*, bool isUnsigned);
>         void emitRightShiftSlowCase(Instruction*, Vector<SlowCaseEntry>::iterator&, bool isUnsigned);
> 
>+        void emitNewFuncExprCommon(Instruction*, FunctionType);
>         void emitVarInjectionCheck(bool needsVarInjectionChecks);
>         void emitResolveClosure(int dst, int scope, bool needsVarInjectionChecks, unsigned depth);
>         void emitLoadWithStructureCheck(int scope, Structure** structureSlot);
>@@ -705,6 +709,7 @@ namespace JSC {
>         MacroAssembler::Call callOperation(J_JITOperation_EJJAp, int, GPRReg, GPRReg, ArrayProfile*);
>         MacroAssembler::Call callOperation(C_JITOperation_EJsc, GPRReg);
>         MacroAssembler::Call callOperation(J_JITOperation_EJscC, int, GPRReg, JSCell*);
>+        MacroAssembler::Call callOperation(J_JITOperation_EJscCJ, int, GPRReg, JSCell*, GPRReg);
>         MacroAssembler::Call callOperation(C_JITOperation_EJscZ, GPRReg, int32_t);
>         MacroAssembler::Call callOperation(C_JITOperation_EJscZ, int, GPRReg, int32_t);
> #if USE(JSVALUE64)
>diff --git a/Source/JavaScriptCore/jit/JITInlines.h b/Source/JavaScriptCore/jit/JITInlines.h
>index a21c8088d78a0e8c6b50818c6ba1f5aa60d59126..c7f8306ac55283295abfd1d68c10e3acd336b8f7 100644
>--- a/Source/JavaScriptCore/jit/JITInlines.h
>+++ b/Source/JavaScriptCore/jit/JITInlines.h
>@@ -271,6 +271,12 @@ ALWAYS_INLINE MacroAssembler::Call JIT::callOperation(J_JITOperation_EJscC opera
>     return appendCallWithExceptionCheckSetJSValueResult(operation, dst);
> }
> 
>+ALWAYS_INLINE MacroAssembler::Call JIT::callOperation(J_JITOperation_EJscCJ operation, int dst, GPRReg arg1, JSCell* cell, GPRReg arg2)
>+{
>+    setupArgumentsWithExecState(arg1, TrustedImmPtr(cell), arg2);
>+    return appendCallWithExceptionCheckSetJSValueResult(operation, dst);
>+}
>+    
> ALWAYS_INLINE MacroAssembler::Call JIT::callOperation(J_JITOperation_EP operation, int dst, void* pointer)
> {
>     setupArgumentsWithExecState(TrustedImmPtr(pointer));
>diff --git a/Source/JavaScriptCore/jit/JITOpcodes.cpp b/Source/JavaScriptCore/jit/JITOpcodes.cpp
>index 0813b1555c83dabab5a0843aff9ea46998b2f439..202962b597923726482dd806b7ed09fc14eed705 100644
>--- a/Source/JavaScriptCore/jit/JITOpcodes.cpp
>+++ b/Source/JavaScriptCore/jit/JITOpcodes.cpp
>@@ -980,26 +980,43 @@ void JIT::emit_op_new_func(Instruction* currentInstruction)
> 
> void JIT::emit_op_new_func_exp(Instruction* currentInstruction)
> {
>+    emitNewFuncExprCommon(currentInstruction, StandardFunctionType);
>+}
>+    
>+void JIT::emitNewFuncExprCommon(Instruction* currentInstruction, FunctionType functionType)
>+{
>+    bool isArrowFunction = functionType == ArrowFunctionType;
>     Jump notUndefinedScope;
>     int dst = currentInstruction[1].u.operand;
> #if USE(JSVALUE64)
>     emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
>+    if (isArrowFunction)
>+        emitGetVirtualRegister(currentInstruction[4].u.operand, regT1);
>     notUndefinedScope = branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsUndefined())));
>     store64(TrustedImm64(JSValue::encode(jsUndefined())), Address(callFrameRegister, sizeof(Register) * dst));
> #else
>     emitLoadPayload(currentInstruction[2].u.operand, regT0);
>+    if (isArrowFunction)
>+        emitLoadPayload(currentInstruction[4].u.operand, regT1);
>     notUndefinedScope = branch32(NotEqual, tagFor(currentInstruction[2].u.operand), TrustedImm32(JSValue::UndefinedTag));
>     emitStore(dst, jsUndefined());
> #endif
>-
>     Jump done = jump();
>     notUndefinedScope.link(this);
>-
>-    FunctionExecutable* funcExpr = m_codeBlock->functionExpr(currentInstruction[3].u.operand);
>-    callOperation(operationNewFunction, dst, regT0, funcExpr);
>+        
>+    FunctionExecutable* function = m_codeBlock->functionExpr(currentInstruction[3].u.operand);
>+    if (isArrowFunction)
>+        callOperation(operationNewArrowFunction, dst, regT0, function, regT1);
>+    else
>+        callOperation(operationNewFunction, dst, regT0, function);
>     done.link(this);
> }
>-
>+    
>+void JIT::emit_op_new_arrow_func_exp(Instruction* currentInstruction)
>+{
>+    emitNewFuncExprCommon(currentInstruction, ArrowFunctionType);
>+}
>+    
> void JIT::emit_op_new_array(Instruction* currentInstruction)
> {
>     int dst = currentInstruction[1].u.operand;
>diff --git a/Source/JavaScriptCore/jit/JITOperations.cpp b/Source/JavaScriptCore/jit/JITOperations.cpp
>index 38015d2d804f935920f9756a71ca2fdfea179590..cbb7936ce80b637b723a85e13750349ad645e7bb 100644
>--- a/Source/JavaScriptCore/jit/JITOperations.cpp
>+++ b/Source/JavaScriptCore/jit/JITOperations.cpp
>@@ -43,6 +43,7 @@
> #include "HostCallReturnValue.h"
> #include "JIT.h"
> #include "JITToDFGDeferredCompilationCallback.h"
>+#include "JSArrowFunction.h"
> #include "JSCInlines.h"
> #include "JSCatchScope.h"
> #include "JSFunctionNameScope.h"
>@@ -1020,6 +1021,31 @@ EncodedJSValue JIT_OPERATION operationNewFunctionWithInvalidatedReallocationWatc
>     return JSValue::encode(JSFunction::createWithInvalidatedReallocationWatchpoint(vm, static_cast<FunctionExecutable*>(functionExecutable), scope));
> }
> 
>+EncodedJSValue operationNewArrowFunctionCommon(ExecState* exec, JSScope* scope, JSCell* functionExecutable, EncodedJSValue thisValue, bool isInvalidated)
>+{
>+    ASSERT(functionExecutable->inherits(FunctionExecutable::info()));
>+    VM& vm = exec->vm();
>+    NativeCallFrameTracer tracer(&vm, exec);
>+        
>+    JSGlobalObject* globalObject = exec->callee()->globalObject();
>+    JSFunction* func =  JSFunction::create(vm, static_cast<FunctionExecutable*>(functionExecutable), scope);
>+    JSArrowFunction* arrowFunction  = isInvalidated
>+        ? JSArrowFunction::createWithInvalidatedReallocationWatchpoint(vm, globalObject, func, JSValue::decode(thisValue))
>+        : JSArrowFunction::create(vm, globalObject, func, JSValue::decode(thisValue));
>+    
>+    return JSValue::encode(arrowFunction);
>+}
>+    
>+EncodedJSValue JIT_OPERATION operationNewArrowFunctionWithInvalidatedReallocationWatchpoint(ExecState* exec, JSScope* scope, JSCell* functionExecutable, EncodedJSValue thisValue)
>+{
>+    return operationNewArrowFunctionCommon(exec, scope, functionExecutable, thisValue, true);
>+}
>+    
>+EncodedJSValue JIT_OPERATION operationNewArrowFunction(ExecState* exec, JSScope* scope, JSCell* functionExecutable, EncodedJSValue thisValue)
>+{
>+    return operationNewArrowFunctionCommon(exec, scope, functionExecutable, thisValue, false);
>+}
>+
> JSCell* JIT_OPERATION operationNewObject(ExecState* exec, Structure* structure)
> {
>     VM* vm = &exec->vm();
>diff --git a/Source/JavaScriptCore/jit/JITOperations.h b/Source/JavaScriptCore/jit/JITOperations.h
>index 7de77fc740856261d5856f427d45e1e37bdb3485..a5c3b52cc929f7dc22d2731796aa6d6b48dc1e10 100644
>--- a/Source/JavaScriptCore/jit/JITOperations.h
>+++ b/Source/JavaScriptCore/jit/JITOperations.h
>@@ -120,6 +120,7 @@ typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_EPP)(ExecState*, void*, vo
> typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_EPS)(ExecState*, void*, size_t);
> typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_EPc)(ExecState*, Instruction*);
> typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_EJscC)(ExecState*, JSScope*, JSCell*);
>+typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_EJscCJ)(ExecState*, JSScope*, JSCell*, EncodedJSValue);
> typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_ESS)(ExecState*, size_t, size_t);
> typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_ESsiCI)(ExecState*, StructureStubInfo*, JSCell*, UniquedStringImpl*);
> typedef EncodedJSValue JIT_OPERATION (*J_JITOperation_ESsiJI)(ExecState*, StructureStubInfo*, EncodedJSValue, UniquedStringImpl*);
>@@ -291,6 +292,9 @@ EncodedJSValue JIT_OPERATION operationNewArrayBufferWithProfile(ExecState*, Arra
> EncodedJSValue JIT_OPERATION operationNewArrayWithSizeAndProfile(ExecState*, ArrayAllocationProfile*, EncodedJSValue size) WTF_INTERNAL;
> EncodedJSValue JIT_OPERATION operationNewFunction(ExecState*, JSScope*, JSCell*) WTF_INTERNAL;
> EncodedJSValue JIT_OPERATION operationNewFunctionWithInvalidatedReallocationWatchpoint(ExecState*, JSScope*, JSCell*) WTF_INTERNAL;
>+EncodedJSValue operationNewArrowFunctionCommon(ExecState*, JSScope*, JSCell*, EncodedJSValue, bool);
>+EncodedJSValue JIT_OPERATION operationNewArrowFunction(ExecState*, JSScope*, JSCell*, EncodedJSValue) WTF_INTERNAL;
>+EncodedJSValue JIT_OPERATION operationNewArrowFunctionWithInvalidatedReallocationWatchpoint(ExecState*, JSScope*, JSCell*, EncodedJSValue) WTF_INTERNAL;
> JSCell* JIT_OPERATION operationNewObject(ExecState*, Structure*) WTF_INTERNAL;
> EncodedJSValue JIT_OPERATION operationNewRegexp(ExecState*, void*) WTF_INTERNAL;
> void JIT_OPERATION operationHandleWatchdogTimer(ExecState*) WTF_INTERNAL;
>diff --git a/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp b/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>index 9cfe87340ee9234081bfbd94528e9e907244aaa9..34f4f2d62e47e3af053b3b029163df189dc43585 100644
>--- a/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>+++ b/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>@@ -38,6 +38,8 @@
> #include "Interpreter.h"
> #include "JIT.h"
> #include "JITExceptions.h"
>+#include "JSArrowFunction.h"
>+#include "JSBoundFunction.h"
> #include "JSLexicalEnvironment.h"
> #include "JSCInlines.h"
> #include "JSCJSValue.h"
>@@ -170,7 +172,9 @@ namespace JSC { namespace LLInt {
>         ExecState* __rcf_exec = (execCallee);                           \
>         LLINT_RETURN_TWO(pc, __rcf_exec);                               \
>     } while (false)
>-
>+    
>+enum FunctionExpressionType { ArrowFunctionExpressionType, CommonFunctionExpressionType};
>+    
> extern "C" SlowPathReturnType llint_trace_operand(ExecState* exec, Instruction* pc, int fromWhere, int operand)
> {
>     LLINT_BEGIN();
>@@ -1021,15 +1025,31 @@ LLINT_SLOW_PATH_DECL(slow_path_new_func)
>     LLINT_RETURN(JSFunction::create(vm, codeBlock->functionDecl(pc[3].u.operand), scope));
> }
> 
>-LLINT_SLOW_PATH_DECL(slow_path_new_func_exp)
>+inline JSFunction* getJSFunctionExpr(ExecState* exec, Instruction* pc, VM& vm)
> {
>-    LLINT_BEGIN();
>     CodeBlock* codeBlock = exec->codeBlock();
>     JSScope* scope = exec->uncheckedR(pc[2].u.operand).Register::scope();
>-    FunctionExecutable* function = codeBlock->functionExpr(pc[3].u.operand);
>-    JSFunction* func = JSFunction::create(vm, function, scope);
>+    FunctionExecutable* executable = codeBlock->functionExpr(pc[3].u.operand);
>+        
>+    return JSFunction::create(vm, executable, scope);
>+}
>+
>+LLINT_SLOW_PATH_DECL(slow_path_new_func_exp)
>+{
>+    LLINT_BEGIN();
>+    
>+    LLINT_RETURN(getJSFunctionExpr(exec, pc, vm));
>+}
>+
>+LLINT_SLOW_PATH_DECL(slow_path_new_arrow_func_exp)
>+{
>+    LLINT_BEGIN();
>+
>+    JSFunction* func =  getJSFunctionExpr(exec, pc, vm);
>+    JSValue thisValue = LLINT_OP_C(4).jsValue();
>+    JSGlobalObject* globalObject = exec->callee()->globalObject();
>     
>-    LLINT_RETURN(func);
>+    LLINT_RETURN(JSArrowFunction::create(vm, globalObject, func, thisValue));
> }
> 
> static SlowPathReturnType handleHostCall(ExecState* execCallee, Instruction* pc, JSValue callee, CodeSpecializationKind kind)
>diff --git a/Source/JavaScriptCore/llint/LLIntSlowPaths.h b/Source/JavaScriptCore/llint/LLIntSlowPaths.h
>index f8f38641007af80fd091c48214f07ef1c86f08d9..3ccdb4b029ca66797bee53f98ae124987397c3b2 100644
>--- a/Source/JavaScriptCore/llint/LLIntSlowPaths.h
>+++ b/Source/JavaScriptCore/llint/LLIntSlowPaths.h
>@@ -98,6 +98,7 @@ LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_switch_char);
> LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_switch_string);
> LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_new_func);
> LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_new_func_exp);
>+LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_new_arrow_func_exp);
> LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_call);
> LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_construct);
> LLINT_SLOW_PATH_HIDDEN_DECL(slow_path_size_frame_for_varargs);
>diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
>index d9cd01b50c87fadc30cd38caec516781da6b4bf2..6cf17de5c68c105c8ea136c780fea611eb45547c 100644
>--- a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
>+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
>@@ -1183,6 +1183,10 @@ _llint_op_new_func_exp:
>     callSlowPath(_llint_slow_path_new_func_exp)
>     dispatch(4)
> 
>+_llint_op_new_arrow_func_exp:
>+    traceExecution()
>+    callSlowPath(_llint_slow_path_new_arrow_func_exp)
>+    dispatch(5)
> 
> _llint_op_call:
>     traceExecution()
>diff --git a/Source/JavaScriptCore/parser/ASTBuilder.h b/Source/JavaScriptCore/parser/ASTBuilder.h
>index 0fb0f29a9b0179f356e09d1ad56c2702627410fd..84ef2cb1f6cb987ddde1b45f4e183441e8ac4f4a 100644
>--- a/Source/JavaScriptCore/parser/ASTBuilder.h
>+++ b/Source/JavaScriptCore/parser/ASTBuilder.h
>@@ -371,7 +371,7 @@ public:
>             ? m_sourceCode->subArrowExpression(info.arrowFunctionOffset, info.endFunctionOffset, info.bodyStartLine, info.bodyStartColumn)
>             : m_sourceCode->subExpression(info.startFunctionOffset, info.endFunctionOffset, info.bodyStartLine, info.bodyStartColumn);
> 
>-        FuncExprNode* result = new (m_parserArena) FuncExprNode(location, *info.name, info.body, source, info.parameters);
>+        ArrowFuncExprNode* result = new (m_parserArena) ArrowFuncExprNode(location, *info.name, info.body, source, info.parameters);
>         info.body->setLoc(info.bodyStartLine, info.bodyEndLine, location.startOffset, location.lineStartOffset);
>         return result;
>     }
>diff --git a/Source/JavaScriptCore/parser/NodeConstructors.h b/Source/JavaScriptCore/parser/NodeConstructors.h
>index 60c7c2ff663f0c2a19eef162188e13b900b9cc76..3d3f4a672991ab53b2d7135f0909fe215f275178 100644
>--- a/Source/JavaScriptCore/parser/NodeConstructors.h
>+++ b/Source/JavaScriptCore/parser/NodeConstructors.h
>@@ -843,6 +843,13 @@ namespace JSC {
>         m_body->finishParsing(source, parameter, ident, FunctionExpression);
>     }
> 
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
>+    inline ArrowFuncExprNode::ArrowFuncExprNode(const JSTokenLocation& location, const Identifier& ident, FunctionBodyNode* body, const SourceCode& source, ParameterNode* parameter)
>+        : FuncExprNode(location, ident, body, source, parameter)
>+    {
>+    }
>+#endif
>+    
>     inline FuncDeclNode::FuncDeclNode(const JSTokenLocation& location, const Identifier& ident, FunctionBodyNode* body, const SourceCode& source, ParameterNode* parameter)
>         : StatementNode(location)
>         , m_body(body)
>diff --git a/Source/JavaScriptCore/parser/Nodes.h b/Source/JavaScriptCore/parser/Nodes.h
>index f29a5104f8af23625a5ca1091d7fa5836ee9f35a..ab96a4b70b4d780a33c306928c7b37edd40ced04 100644
>--- a/Source/JavaScriptCore/parser/Nodes.h
>+++ b/Source/JavaScriptCore/parser/Nodes.h
>@@ -158,6 +158,9 @@ namespace JSC {
>         virtual bool isDotAccessorNode() const { return false; }
>         virtual bool isDestructuringNode() const { return false; }
>         virtual bool isFuncExprNode() const { return false; }
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
>+        virtual bool isArrowFuncExprNode() const { return false; }
>+#endif
>         virtual bool isCommaNode() const { return false; }
>         virtual bool isSimpleArray() const { return false; }
>         virtual bool isAdd() const { return false; }
>@@ -1743,6 +1746,19 @@ namespace JSC {
>         FunctionBodyNode* m_body;
>     };
> 
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
>+    class ArrowFuncExprNode : public FuncExprNode {
>+    public:
>+        ArrowFuncExprNode(const JSTokenLocation&, const Identifier&, FunctionBodyNode*, const SourceCode&, ParameterNode* = 0);
>+    private:
>+        virtual RegisterID* emitBytecode(BytecodeGenerator&, RegisterID* = 0) override;
>+        
>+        virtual bool isFuncExprNode() const override { return false; }
>+        
>+        virtual bool isArrowFuncExprNode() const override { return true; }
>+    };
>+#endif
>+
> #if ENABLE(ES6_CLASS_SYNTAX)
>     class ClassExprNode final : public ExpressionNode {
>     public:
>diff --git a/Source/JavaScriptCore/runtime/JSArrowFunction.cpp b/Source/JavaScriptCore/runtime/JSArrowFunction.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..6d4841c1d2d59d3fe13bcc7dd88e3e5fa111e1e6
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/JSArrowFunction.cpp
>@@ -0,0 +1,107 @@
>+/*
>+ * Copyright (C) 2015 Aleksandr Skachkov <gskachkov@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. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "JSArrowFunction.h"
>+
>+#include "Error.h"
>+#include "ExceptionHelpers.h"
>+#include "JSCInlines.h"
>+#include "JSCJSValue.h"
>+#include "JSFunction.h"
>+#include "JSFunctionInlines.h"
>+#include "JSObject.h"
>+#include "PropertySlot.h"
>+#include "VM.h"
>+
>+namespace JSC {
>+
>+const ClassInfo JSArrowFunction::s_info = { "ArrowFunction", &Base::s_info, 0, CREATE_METHOD_TABLE(JSArrowFunction) };
>+
>+EncodedJSValue JSC_HOST_CALL arrowFunctionCall(ExecState* exec)
>+{
>+    JSArrowFunction* arrowFunction = jsCast<JSArrowFunction*>(exec->callee());
>+
>+    MarkedArgumentBuffer args;
>+    for (unsigned i = 0; i < exec->argumentCount(); ++i)
>+        args.append(exec->uncheckedArgument(i));
>+
>+    JSObject* function = arrowFunction->arrowFunction();
>+    CallData callData;
>+    CallType callType = getCallData(function, callData);
>+    ASSERT(callType != CallTypeNone);
>+    return JSValue::encode(call(exec, function, callType, callData, arrowFunction->boundThis(), args));
>+}
>+
>+void JSArrowFunction::destroy(JSCell* cell)
>+{
>+    static_cast<JSArrowFunction*>(cell)->JSArrowFunction::~JSArrowFunction();
>+}
>+
>+JSArrowFunction::JSArrowFunction(VM& vm, JSGlobalObject* globalObject, Structure* structure, JSObject* arrowFunction, JSValue boundThis)
>+    : Base(vm, globalObject, structure)
>+    , m_boundThis(vm, this, boundThis)
>+    , m_arrowFunction(vm, this, arrowFunction)
>+{
>+}
>+
>+JSArrowFunction* JSArrowFunction::createWithInvalidatedReallocationWatchpoint(VM& vm, JSGlobalObject* globalObject, JSObject* arrowFunction, JSValue boundThis)
>+{
>+    ASSERT(jsCast<JSFunction*>(arrowFunction)->jsExecutable()->singletonFunction()->hasBeenInvalidated());
>+    return create(vm, globalObject, arrowFunction, boundThis);
>+}
>+
>+JSArrowFunction* JSArrowFunction::create(VM& vm, JSGlobalObject* globalObject, JSObject* arrowFunction, JSValue boundThis)
>+{
>+    NativeExecutable* executable = vm.getHostFunction(arrowFunctionCall, callHostFunctionAsConstructor);
>+    JSArrowFunction* function = new (NotNull, allocateCell<JSArrowFunction>(vm.heap)) JSArrowFunction(vm, globalObject, globalObject->arrowFunctionStructure(), arrowFunction, boundThis);
>+    function->finishCreation(vm, executable, 0, "");
>+
>+    return function;
>+}
>+
>+void JSArrowFunction::finishCreation(VM& vm, NativeExecutable* executable, int length, const String& name)
>+{
>+    Base::finishCreation(vm, executable, length, name);
>+    ASSERT(inherits(info()));
>+
>+    putDirect(vm, vm.propertyNames->thisIdentifier, boundThis(), DontDelete | ReadOnly | DontEnum);
>+}
>+
>+void JSArrowFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
>+{
>+    JSArrowFunction* thisObject = jsCast<JSArrowFunction*>(cell);
>+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
>+    Base::visitChildren(thisObject, visitor);
>+
>+    visitor.append(&thisObject->m_arrowFunction);
>+    visitor.append(&thisObject->m_boundThis);
>+}
>+
>+ConstructType JSArrowFunction::getConstructData(JSCell*, ConstructData&)
>+{
>+    return ConstructTypeNone;
>+}
>+} // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/JSArrowFunction.h b/Source/JavaScriptCore/runtime/JSArrowFunction.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..f34789c3da9cdef307af99f234b9486bf7c91c42
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/JSArrowFunction.h
>@@ -0,0 +1,85 @@
>+/*
>+ * Copyright (C) 2015 Aleksandr Skachkov <gskachkov@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. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#ifndef JSArrowFunction_h
>+#define JSArrowFunction_h
>+
>+#include "JSFunction.h"
>+#include "JSGlobalObject.h"
>+
>+namespace JSC {
>+
>+EncodedJSValue JSC_HOST_CALL arrowFunctionCall(ExecState*);
>+    
>+class JSArrowFunction : public JSFunction {
>+public:
>+    typedef JSFunction Base;
>+
>+    static JSArrowFunction* create(VM&, JSGlobalObject*, JSObject*, JSValue);
>+    static JSArrowFunction* createWithInvalidatedReallocationWatchpoint(VM&, JSGlobalObject*, JSObject*, JSValue);
>+
>+    static void destroy(JSCell*);
>+    
>+    static size_t allocationSize(size_t inlineCapacity)
>+    {
>+        ASSERT_UNUSED(inlineCapacity, !inlineCapacity);
>+        return sizeof(JSArrowFunction);
>+    }
>+    
>+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>+    {
>+        ASSERT(globalObject);
>+        return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), info());
>+    }
>+        
>+    static ConstructType getConstructData(JSCell*, ConstructData&);
>+
>+    JSObject* arrowFunction() { return m_arrowFunction.get(); }
>+    JSValue boundThis() { return m_boundThis.get(); }
>+    
>+    DECLARE_INFO;
>+    
>+    static inline ptrdiff_t offsetOfThisValue()
>+    {
>+        return OBJECT_OFFSETOF(JSArrowFunction, m_boundThis);
>+    }
>+    
>+    const static unsigned StructureFlags = Base::StructureFlags;
>+
>+protected:
>+    static void visitChildren(JSCell*, SlotVisitor&);
>+        
>+private:
>+    JSArrowFunction(VM&, JSGlobalObject*, Structure*, JSObject*, JSValue);
>+
>+    void finishCreation(VM&, NativeExecutable*, int, const String&);
>+    
>+    WriteBarrier<Unknown> m_boundThis;
>+    WriteBarrier<JSObject> m_arrowFunction;
>+};
>+    
>+} // namespace JSC
>+
>+#endif // JSArrowFunction_h
>diff --git a/Source/JavaScriptCore/runtime/JSGlobalObject.cpp b/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
>index 10bf17782022c4794d30e70efb2bef5df242ce18..ab015b4837754aa730f601b2e0eb49ead916b024 100644
>--- a/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
>+++ b/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
>@@ -59,6 +59,7 @@
> #include "JSArrayBufferConstructor.h"
> #include "JSArrayBufferPrototype.h"
> #include "JSArrayIterator.h"
>+#include "JSArrowFunction.h"
> #include "JSBoundFunction.h"
> #include "JSCInlines.h"
> #include "JSCallbackConstructor.h"
>@@ -261,6 +262,7 @@ void JSGlobalObject::init(VM& vm)
>     exec->setCallee(m_globalCallee.get());
> 
>     m_functionStructure.set(vm, this, JSFunction::createStructure(vm, this, m_functionPrototype.get()));
>+    m_arrowFunctionStructure.set(vm, this, JSArrowFunction::createStructure(vm, this, m_functionPrototype.get()));
>     m_boundFunctionStructure.set(vm, this, JSBoundFunction::createStructure(vm, this, m_functionPrototype.get()));
>     m_namedFunctionStructure.set(vm, this, Structure::addPropertyTransition(vm, m_functionStructure.get(), vm.propertyNames->name, DontDelete | ReadOnly | DontEnum, m_functionNameOffset));
>     m_internalFunctionStructure.set(vm, this, InternalFunction::createStructure(vm, this, m_functionPrototype.get()));
>@@ -824,6 +826,7 @@ void JSGlobalObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
>     visitor.append(&thisObject->m_calleeStructure);
>     visitor.append(&thisObject->m_functionStructure);
>     visitor.append(&thisObject->m_boundFunctionStructure);
>+    visitor.append(&thisObject->m_arrowFunctionStructure);
>     visitor.append(&thisObject->m_namedFunctionStructure);
>     visitor.append(&thisObject->m_symbolObjectStructure);
>     visitor.append(&thisObject->m_regExpStructure);
>diff --git a/Source/JavaScriptCore/runtime/JSGlobalObject.h b/Source/JavaScriptCore/runtime/JSGlobalObject.h
>index 594d966223378d1d1aab8f47595ade0822c18223..4dee92938fa716bc1f4d6b6de5a89ec0933cc826 100644
>--- a/Source/JavaScriptCore/runtime/JSGlobalObject.h
>+++ b/Source/JavaScriptCore/runtime/JSGlobalObject.h
>@@ -242,6 +242,7 @@ protected:
>     WriteBarrier<Structure> m_calleeStructure;
>     WriteBarrier<Structure> m_functionStructure;
>     WriteBarrier<Structure> m_boundFunctionStructure;
>+    WriteBarrier<Structure> m_arrowFunctionStructure;
>     WriteBarrier<Structure> m_namedFunctionStructure;
>     PropertyOffset m_functionNameOffset;
>     WriteBarrier<Structure> m_privateNameStructure;
>@@ -486,6 +487,7 @@ public:
>     Structure* calleeStructure() const { return m_calleeStructure.get(); }
>     Structure* functionStructure() const { return m_functionStructure.get(); }
>     Structure* boundFunctionStructure() const { return m_boundFunctionStructure.get(); }
>+    Structure* arrowFunctionStructure() const { return m_arrowFunctionStructure.get(); }
>     Structure* namedFunctionStructure() const { return m_namedFunctionStructure.get(); }
>     PropertyOffset functionNameOffset() const { return m_functionNameOffset; }
>     Structure* numberObjectStructure() const { return m_numberObjectStructure.get(); }
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-bound.js b/Source/JavaScriptCore/tests/stress/arrowfunction-bound.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..92032088abf26dae2ae71a2ac4c05d4f07755e40
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-bound.js
>@@ -0,0 +1,18 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+var d = {
>+  x : "bar",
>+  y : function() { return z => this.x + z; }
>+};
>+
>+noInline(d.y);
>+
>+var e = { x : "baz" };
>+
>+for (var i=0; i<10000; i++) {
>+  testCase(d.y().bind(e, "ley")(), "barley", "Error: function bind shouldn't change lexical binding of the arrow function");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-call.js b/Source/JavaScriptCore/tests/stress/arrowfunction-call.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..6877e0ad9c83ac53a7f6d3519623214c1e9fc60e
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-call.js
>@@ -0,0 +1,18 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+var d = {
>+  x : "foo",
>+  y : function() { return () => this.x; }
>+};
>+noInline(d.y);
>+
>+var e = { x : "bar" };
>+
>+for (var i=0; i<10000;i++){
>+    testCase(d.y().call(e), "foo", "Error: function call shouln't change the lexical binding of the arrow function");
>+    testCase(d.y().apply(e), "foo", "Error: function apply shouln't change the lexical binding of the arrow function");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-constructor.js b/Source/JavaScriptCore/tests/stress/arrowfunction-constructor.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..15beb557d7949bc6b2c78ab4659ea8c2ac63de62
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-constructor.js
>@@ -0,0 +1,22 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+var simpleArrowFunction = () => {};
>+
>+noInline(simpleArrowFunction);
>+
>+var errorOnCreate = false;
>+
>+for (i=0;i<10000;i++) {
>+   try {
>+       var fc = new simpleArrowFunction();
>+   }
>+   catch (e) {
>+     errorOnCreate = true;
>+   }
>+
>+    testCase(errorOnCreate, true, "Error: No exception during run new ArrowFunction");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-arguments.js b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-arguments.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..1eb6763a652698165c0fdb2d8bc2073d2bcd3b1f
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-arguments.js
>@@ -0,0 +1,14 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+function afCreator() {
>+    return a => arguments[0];
>+}
>+
>+var af = afCreator(12);
>+
>+//Fixme: lexical bind of the arguments is not implemented
>+//testCase(af(6), 12, "Error: arguments is not lexically binded inside of the arrow function");
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-1.js b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-1.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..4cfab24c91bc57c9587632dfec9a4c93798e215c
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-1.js
>@@ -0,0 +1,19 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+function Dog(name) {
>+  this.name = name;
>+  this.getName = () => eval("this.name");
>+  this.getNameHard = () => eval("(() => this.name)()");
>+}
>+
>+noInline(Dog)
>+
>+for (var i=0;i<10000; i++) {
>+  var d = new Dog("Max");
>+  testCase(d.getName(), d.name, "Error: this is not lexically binded inside of the arrow function #1");
>+  testCase(d.getNameHard(), d.name, "Error: this is not lexically binded inside of the arrow function #2");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-2.js b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-2.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..2dcf59ca9540d86eac8caa5c3394ffb33d34da26
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-2.js
>@@ -0,0 +1,38 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+var afObjLexBind2 = function () {
>+  this.func = () => this;
>+};
>+
>+var afObjLexBind2Instance = new afObjLexBind2();
>+
>+testCase(afObjLexBind2Instance.func() === afObjLexBind2Instance, true, "Error: this is not lexically binded inside of the arrow function #2");
>+
>+var obj = {
>+  method: function () {
>+    return () => this;
>+  }
>+};
>+
>+noInline(obj.method);
>+
>+for (var i=0; i < 10000; i++) {
>+    testCase(obj.method()() === obj, true, "Error: this is not lexically binded inside of the arrow function #3");
>+}
>+
>+var fake = {steal: obj.method()};
>+noInline(fake.steal);
>+
>+for (var i=0; i < 10000; i++) {
>+    testCase(fake.steal() === obj, true, "Error: this is not lexically binded inside of the arrow function #4");
>+}
>+
>+var real = {borrow: obj.method};
>+
>+for (var i=0; i < 10000; i++) {
>+    testCase(real.borrow()() === real, true, "Error: this is not lexically binded inside of the arrow function #5");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-3.js b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-3.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..148bcccc84f67b3049281899e23bd4f8c676c824
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-3.js
>@@ -0,0 +1,17 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+
>+var obj = { name:'obj', method: function () { return (value) => this.name + "-name-" + value; }};
>+
>+for (var i=0; i<10000; i++) {
>+  testCase(obj.method()('test' + i.toString()), 'obj-name-test' + i.toString(), "Error: this is not lexically binded inside of the arrow function #1");
>+}
>+obj.name='newObj';
>+
>+for (var i=0; i<10000; i++) {
>+  testCase(obj.method()('test' + i.toString()), 'newObj-name-test' + i.toString(), "Error: this is not lexically binded inside of the arrow function #5");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-4.js b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-4.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..85bd363e4e46b02d2f19bbe38502f528233a9f13
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-4.js
>@@ -0,0 +1,26 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+
>+var obj = {
>+  name:'obj',
>+  internalObject: {
>+    name  :'internalObject',
>+    method: function () { return (value) => this.name + "-name-" + value; }
>+  }
>+};
>+
>+noInline(obj.internalObject.method);
>+
>+for (var i=0; i<10000; i++) {
>+    testCase(obj.internalObject.method()('test' + i.toString()), 'internalObject-name-test' + i.toString(), "Error: this is not lexically binded inside of the arrow function #1");
>+}
>+
>+obj.internalObject.name='newInternalObject';
>+
>+for (var i=0; i<10000; i++) {
>+    testCase(obj.internalObject.method()('test' + i.toString()), 'newInternalObject-name-test' + i.toString(), "Error: this is not lexically binded inside of the arrow function #5");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-5.js b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-5.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..875494ce6b66db0a7eb43dcc83ec1eace6287546
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-5.js
>@@ -0,0 +1,48 @@
>+var sortedValues;
>+
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+
>+var obj = {
>+  arr: [1, 4, 6, 3, 7, 0],
>+  bubbleSort: function () {
>+    return () => {
>+      var tmp;
>+      var ar = this.arr.slice();
>+      var _length = ar.length
>+      for (var i = 0; i < _length; i++) {
>+        for (var j = i; j > 0; j--) {
>+          if ((ar[j] - ar[j - 1]) < 0) {
>+            tmp = ar[j];
>+            ar[j] = ar[j - 1];
>+            ar[j - 1] = tmp;
>+          }
>+        }
>+      }
>+      return ar;
>+    }
>+  }
>+};
>+
>+noInline(obj.bubbleSort);
>+
>+for (var i=0; i<10000; i++) {
>+    obj.arr = [1, 2, 4, 6, 3, 7, 0];
>+    testCase(obj.bubbleSort()().length, 7, "Error: this is not lexically binded inside of the arrow function #1");
>+
>+    var sortedValues = obj.bubbleSort()();
>+    testCase(sortedValues[0], 0, "Error: this is not lexically binded inside of the arrow function #6");
>+    testCase(sortedValues[6], 7, "Error: this is not lexically binded inside of the arrow function #7");
>+
>+    obj.arr = [1, 2, 4, 6, 5, 8, 21, 19, 0];
>+
>+    testCase(obj.bubbleSort()().length, 9, "Error: this is not lexically binded inside of the arrow function #8");
>+
>+    sortedValues = obj.bubbleSort()();
>+    testCase(sortedValues[1], 1, "Error: this is not lexically binded inside of the arrow function #12");
>+    testCase(sortedValues[8], 21, "Error: this is not lexically binded inside of the arrow function #13");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-others.js b/Source/JavaScriptCore/tests/stress/arrowfunction-others.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..14ce0c658d3a2f79229df4f892ccda1513c94e59
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-others.js
>@@ -0,0 +1,17 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+var simpleArrowFunction = () => {};
>+
>+noInline(simpleArrowFunction);
>+
>+for (var i=0;i<10000;i++) {
>+   testCase(Object.getPrototypeOf(simpleArrowFunction), Function.prototype, "Error: Not correct getPrototypeOf value for arrow function");
>+
>+   testCase(simpleArrowFunction instanceof Function, true, "Error: Not correct result for instanceof method for arrow function");
>+
>+   testCase(simpleArrowFunction.constructor == Function, true, "Error: Not correct result for constructor method of arrow functio   n");
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-run-10-1.js b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10-1.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..07a1f0a49cb16863c5921361f0adb1e14ec9b65a
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10-1.js
>@@ -0,0 +1,24 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+function run(count) {
>+  var result = true;
>+  for(var i=0; i<count; i++) {
>+    var Obj = function (name) {
>+      this.name = name;
>+      this.getName = () => this.name;
>+    };
>+
>+    var obj = new Obj("Item" + i);
>+    if (obj.name !== obj.getName()) {
>+      result = false;
>+    }
>+  }
>+  return result;
>+}
>+
>+testCase(run(1), true, "Error: Error: during execution of arrow function one time");
>+testCase(run(10), true, "Error: Error: during execution of arrow function 10 times");
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-run-10-2.js b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10-2.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..5ddcdb3c70a1b27c3dbb52380955f5353d767425
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10-2.js
>@@ -0,0 +1,25 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+function run(count) {
>+  var result = true;
>+  for(var i=0; i<count; i++) {
>+    var Obj = function (name) {
>+      this.name = name;
>+      this.getName = () => eval("this.name");;
>+    };
>+
>+
>+    var obj = new Obj("Item" + i);
>+    if (obj.name !== obj.getName()) {
>+      result = false;
>+    }
>+  }
>+  return result;
>+}
>+
>+testCase(run(1), true, "Error: during execution of arrow function one time");
>+testCase(run(10), true, "Error: during execution of arrow function 10 times");
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-run-10000-1.js b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10000-1.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..0e5f6bc86bd31451b01ca27d0b9720b57e8d6051
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10000-1.js
>@@ -0,0 +1,23 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+function run(count) {
>+  var result = true;
>+  for(var i=0; i<count; i++) {
>+    var Obj = function (name) {
>+      this.name = name;
>+      this.getName = () => this.name;
>+    };
>+
>+    var obj = new Obj("Item" + i);
>+    if (obj.name !== obj.getName()) {
>+      result = false;
>+    }
>+  }
>+  return result;
>+}
>+
>+testCase(run(10000), true, "Error: Error: during execution of arrow function 10000 times");
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-run-10000-2.js b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10000-2.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..dc4271f4a31591625a0bd3d744d2512633302e43
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-run-10000-2.js
>@@ -0,0 +1,23 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+function run(count) {
>+  var result = true;
>+  for (var i=0; i<count; i++) {
>+    var Obj = function (name) {
>+      this.name = name;
>+      this.getName = () => eval("this.name");;
>+    };
>+
>+    var obj = new Obj("Item" + i);
>+    if (obj.name !== obj.getName()) {
>+      result = false;
>+    }
>+  }
>+  return result;
>+}
>+
>+testCase(run(10000), true, "Error: Error: during execution of arrow function 10000 times");
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-tdz.js b/Source/JavaScriptCore/tests/stress/arrowfunction-tdz.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..6874923971983dcda34c269392117b1748e67b4a
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-tdz.js
>@@ -0,0 +1,27 @@
>+var A = class A { };
>+var B = class B extends A {
>+  constructor(accessThisBeforeSuper) {
>+    if (accessThisBeforeSuper) {
>+      var f = () => this;
>+      super();
>+    } else {
>+      super();
>+    }
>+  }
>+};
>+
>+var exception = null;
>+for (var i=0; i<10000; i++) {
>+  try {
>+       new B(true);
>+  } catch (e) {
>+      exception = e;
>+      if (!(e instanceof ReferenceError))
>+          throw "Exception thrown was not a reference error";
>+  }
>+
>+  if (!exception)
>+      throw "Exception not thrown for an unitialized this at iteration";
>+
>+  var e = new B(false);
>+}
>diff --git a/Source/JavaScriptCore/tests/stress/arrowfunction-typeof.js b/Source/JavaScriptCore/tests/stress/arrowfunction-typeof.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..b735dddded1e0b545b31f6a8104e89f6de09bc53
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-typeof.js
>@@ -0,0 +1,26 @@
>+var testCase = function (actual, expected, message) {
>+  if (actual !== expected) {
>+    throw message + ". Expected '" + expected + "', but was '" + actual + "'";
>+  }
>+};
>+
>+var af1 = () => {};
>+var af2 = (a) => {a + 1};
>+
>+noInline(af1);
>+noInline(af2);
>+
>+for (var i = 0; i < 10000; ++i) {
>+  testCase(typeof af1, "function", "Error: Not correct type of the arrow function #1");
>+  testCase(typeof af1.prototype === 'undefined', true, "Error: Not correct result for prototype of arrow function #1");
>+
>+  testCase(typeof af2, "function", "Error: Not correct type of the arrow function #2");
>+  testCase(typeof af2.prototype === 'undefined', true, "Error: Not correct result for prototype of arrow function #2");
>+
>+  testCase(typeof (()=>{}), "function", "Error: Not correct type of the arrow function #3");
>+  testCase(typeof (()=>{}).prototype === 'undefined', true, "Error: Not correct result for prototype of arrow function #3");
>+
>+
>+   testCase(typeof ((b) => {b + 1}), "function", "Error: Not correct type of the arrow function #4");
>+   testCase(typeof ((b) => {b + 1}).prototype === 'undefined', true, "Error: Not correct result for prototype of arrow function #4");
>+}
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index 860c92bc653a5ac02ca72ae54b800eb1381655a7..a289606db4f0f102e970b49a90c20859ea4a3bb4 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,37 @@
>+2015-07-15  Skachkov Oleksandr  <gskachkov@gmail.com>
>+
>+        [ES6] Implement ES6 arrow function syntax. Arrow function specific features. Lexical bind of this
>+        https://bugs.webkit.org/show_bug.cgi?id=144956
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * js/arrowfunction-bind-expected.txt: Added.
>+        * js/arrowfunction-bind.html: Added.
>+        * js/arrowfunction-call-expected.txt: Added.
>+        * js/arrowfunction-call.html: Added.
>+        * js/arrowfunction-constructor-expected.txt: Added.
>+        * js/arrowfunction-constructor.html: Added.
>+        * js/arrowfunction-lexical-arguments-expected.txt: Added.
>+        * js/arrowfunction-lexical-this-1-expected.txt: Added.
>+        * js/arrowfunction-lexical-this-1.html: Added.
>+        * js/arrowfunction-lexical-this-2-expected.txt: Added.
>+        * js/arrowfunction-lexical-this-2.html: Added.
>+        * js/arrowfunction-others-expected.txt: Added.
>+        * js/arrowfunction-others.html: Added.
>+        * js/arrowfunction-tdz-expected.txt: Added.
>+        * js/arrowfunction-tdz.html: Added.
>+        * js/arrowfunction-typeof-expected.txt: Added.
>+        * js/arrowfunction-typeof.html: Added.
>+        * js/script-tests/arrowfunction-bind.js: Added.
>+        * js/script-tests/arrowfunction-call.js: Added.
>+        * js/script-tests/arrowfunction-constructor.js: Added.
>+        * js/script-tests/arrowfunction-lexical-arguments.js: Added.
>+        * js/script-tests/arrowfunction-lexical-this-1.js: Added.
>+        * js/script-tests/arrowfunction-lexical-this-2.js: Added.
>+        * js/script-tests/arrowfunction-others.js: Added.
>+        * js/script-tests/arrowfunction-tdz.js: Added.
>+        * js/script-tests/arrowfunction-typeof.js: Added.
>+
> 2015-07-05  Sam Weinig  <sam@webkit.org>
> 
>         DOM4: prepend, append, before, after & replace
>diff --git a/LayoutTests/js/arrowfunction-bind-expected.txt b/LayoutTests/js/arrowfunction-bind-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..22b326ccbb4e14c689dd7d9383cc5bc94ff7f014
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-bind-expected.txt
>@@ -0,0 +1,10 @@
>+Tests for ES6 arrow function, this should be overwritten during invoke bind
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS d.y().bind(e, 'ley')() is 'barley'
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-bind.html b/LayoutTests/js/arrowfunction-bind.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..0b9acb2bc8fd504c68f0445a6eac4a6a1454abab
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-bind.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/arrowfunction-bind.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/arrowfunction-call-expected.txt b/LayoutTests/js/arrowfunction-call-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..9c077f9979acf45e16b996572d1afdeedd591124
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-call-expected.txt
>@@ -0,0 +1,11 @@
>+Tests for ES6 arrow function, this should be overwritten during invoke call&apply
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS d.y().call(e) is 'foo'
>+PASS d.y().apply(e) is 'foo'
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-call.html b/LayoutTests/js/arrowfunction-call.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..c1d8a47e30b6a8749ec5b7e783c6a9ec3132d2d2
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-call.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/arrowfunction-call.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/arrowfunction-constructor-expected.txt b/LayoutTests/js/arrowfunction-constructor-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..56706fff17c2123853640bb2a4eb17d63e1a3723
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-constructor-expected.txt
>@@ -0,0 +1,10 @@
>+Tests for ES6 arrow function no constructor
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS new simpleArrowFunction() threw exception TypeError: function is not a constructor (evaluating 'new simpleArrowFunction()').
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-constructor.html b/LayoutTests/js/arrowfunction-constructor.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..20c0b9a9cdd4d8bdfa6241cb6befbf04cc95830f
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-constructor.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/arrowfunction-constructor.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/arrowfunction-lexical-arguments-expected.txt b/LayoutTests/js/arrowfunction-lexical-arguments-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..39e8963024503ee1e66b0645a80c4f6ac6401104
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-lexical-arguments-expected.txt
>@@ -0,0 +1,9 @@
>+Tests for ES6 arrow function, arguments lexical bid
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-lexical-this-1-expected.txt b/LayoutTests/js/arrowfunction-lexical-this-1-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..d0d27de1af80593c400298ab518c888336054615
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-lexical-this-1-expected.txt
>@@ -0,0 +1,15 @@
>+Tests for ES6 arrow function lexical bind of this
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS d.getName() is d.name
>+PASS d.getNameHard() is d.name
>+PASS obj.method()('test1') is 'obj-name-test1'
>+PASS obj.method()('test1') is 'newObj-name-test1'
>+PASS deepObj.internalObject.method()('test1') is 'internalObject-name-test1'
>+PASS deepObj.internalObject.method()('test1') is 'newInternalObject-name-test1'
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-lexical-this-1.html b/LayoutTests/js/arrowfunction-lexical-this-1.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..2cf2671f52c7d87f6545e6d9553ad56010ac344d
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-lexical-this-1.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/arrowfunction-lexical-this-1.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/arrowfunction-lexical-this-2-expected.txt b/LayoutTests/js/arrowfunction-lexical-this-2-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..ee1feea95ebc48d78e6646a915755626e049fbc9
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-lexical-this-2-expected.txt
>@@ -0,0 +1,13 @@
>+Tests for ES6 arrow function lexical bind of this
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS afObjLexBind2Instance.func() === afObjLexBind2Instance is true
>+PASS obj.method()() === obj is true
>+PASS fake.steal() === obj is true
>+PASS real.borrow()() === real is true
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-lexical-this-2.html b/LayoutTests/js/arrowfunction-lexical-this-2.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..4229e967ebf31054f92eb9846d9bb8456c11e4c6
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-lexical-this-2.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/arrowfunction-lexical-this-2.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/arrowfunction-others-expected.txt b/LayoutTests/js/arrowfunction-others-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..19152e5e37c6915f3823e29b20a94df53d08c001
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-others-expected.txt
>@@ -0,0 +1,12 @@
>+Tests for ES6 arrow function instanceof and typeof operators
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS Object.getPrototypeOf(simpleArrowFunction) is Function.prototype
>+PASS simpleArrowFunction instanceof Function is true
>+PASS simpleArrowFunction.constructor == Function is true
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-others.html b/LayoutTests/js/arrowfunction-others.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..9f67f8b00e46055ee6fae5c1e8289efee1f11090
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-others.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/arrowfunction-others.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/arrowfunction-tdz-expected.txt b/LayoutTests/js/arrowfunction-tdz-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..17af6cd8600e8841277c494a989022452ea6ab5d
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-tdz-expected.txt
>@@ -0,0 +1,10 @@
>+Tests for ES6 arrow function test tdz
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS isReferenceError is true
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-tdz.html b/LayoutTests/js/arrowfunction-tdz.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..f8ef171cb820beb3cb4a7d3fc48e5c53fc11926d
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-tdz.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/arrowfunction-tdz.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/arrowfunction-typeof-expected.txt b/LayoutTests/js/arrowfunction-typeof-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..1a32bc234078717b992984acf433606da0306352
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-typeof-expected.txt
>@@ -0,0 +1,12 @@
>+PASS typeof af1 === 'function' is true
>+PASS typeof af1.prototype ==='undefined' is true
>+PASS typeof af2 === 'function' is true
>+PASS typeof af2.prototype === 'undefined' is true
>+PASS typeof (()=>{}) === 'function' is true
>+PASS typeof (()=>{}).prototype === 'undefined' is true
>+PASS typeof ((b) => {b + 1})==='function' is true
>+PASS typeof ((b) => {b + 1}).prototype ==='undefined' is true
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-typeof.html b/LayoutTests/js/arrowfunction-typeof.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..f0acaaa1a4e4d0e4cb3d0765e373fedb74380e01
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-typeof.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/arrowfunction-typeof.js"></script>
>+<script src="../resources/js-test-post.js"></script>
>+</body>
>+</html>
>diff --git a/LayoutTests/js/script-tests/arrowfunction-bind.js b/LayoutTests/js/script-tests/arrowfunction-bind.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..153f08e966c794cbaf9ad4a3adb4e9979c02ac2a
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-bind.js
>@@ -0,0 +1,12 @@
>+description('Tests for ES6 arrow function, this should be overwritten during invoke bind');
>+
>+var d = {
>+  x : "bar",
>+  y : function() { return z => this.x + z; }
>+};
>+
>+var e = { x : "baz" };
>+
>+shouldBe("d.y().bind(e, 'ley')()", "'barley'");
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-call.js b/LayoutTests/js/script-tests/arrowfunction-call.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..5c888f911bf1c44d389d0a3d2184683484b6f96d
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-call.js
>@@ -0,0 +1,13 @@
>+description('Tests for ES6 arrow function, this should be overwritten during invoke call&apply');
>+
>+var d = {
>+  x : "foo",
>+  y : function() { return () => this.x; }
>+};
>+
>+var e = { x : "bar" };
>+
>+shouldBe('d.y().call(e)', "'foo'");
>+shouldBe('d.y().apply(e)', "'foo'");
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-constructor.js b/LayoutTests/js/script-tests/arrowfunction-constructor.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..aefad076847bff4929f7807765f990b7373cdf6d
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-constructor.js
>@@ -0,0 +1,7 @@
>+description('Tests for ES6 arrow function no constructor');
>+
>+var simpleArrowFunction = () => {};
>+
>+shouldThrow('new simpleArrowFunction()');
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-lexical-arguments.js b/LayoutTests/js/script-tests/arrowfunction-lexical-arguments.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..189623a2cf3bdac803bb7ff0db56c87c68c8cf5b
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-lexical-arguments.js
>@@ -0,0 +1,12 @@
>+description('Tests for ES6 arrow function, arguments lexical bid');
>+
>+function afCreator() {
>+    return a => arguments[0];
>+}
>+
>+var af = afCreator(12);
>+
>+//Fixme: lexical bind of the arguments is not implemented
>+//sholudBe(af(6), 12, "Error: arguments is not lexically binded inside of the arrow function");
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-lexical-this-1.js b/LayoutTests/js/script-tests/arrowfunction-lexical-this-1.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..9fbe7bc19e97e2a891ee16afa0eced4954066832
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-lexical-this-1.js
>@@ -0,0 +1,37 @@
>+description('Tests for ES6 arrow function lexical bind of this');
>+
>+function Dog(name) {
>+  this.name = name;
>+  this.getName = () => eval("this.name");
>+  this.getNameHard = () => eval("(() => this.name)()");
>+}
>+
>+var d = new Dog("Max");
>+shouldBe('d.getName()', 'd.name');
>+shouldBe('d.getNameHard()', 'd.name');
>+
>+var obj = {
>+  name:'obj',
>+  method: function () {
>+    return (value) => this.name + "-name-" + value;
>+  }
>+};
>+
>+shouldBe("obj.method()('test1')", "'obj-name-test1'");
>+obj.name='newObj';
>+shouldBe("obj.method()('test1')", "'newObj-name-test1'");
>+
>+var deepObj = {
>+  name:'obj',
>+  internalObject: {
>+    name  :'internalObject',
>+    method: function () { return (value) => this.name + "-name-" + value; }
>+  }
>+};
>+shouldBe("deepObj.internalObject.method()('test1')", "'internalObject-name-test1'");
>+
>+deepObj.internalObject.name='newInternalObject';
>+
>+shouldBe("deepObj.internalObject.method()('test1')", "'newInternalObject-name-test1'");
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-lexical-this-2.js b/LayoutTests/js/script-tests/arrowfunction-lexical-this-2.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..421ddbd86c3e5ca00df5af0241bc3cad14372227
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-lexical-this-2.js
>@@ -0,0 +1,25 @@
>+description('Tests for ES6 arrow function lexical bind of this');
>+
>+var afObjLexBind2 = function () {
>+  this.func = () => this;
>+};
>+
>+var afObjLexBind2Instance = new afObjLexBind2();
>+
>+shouldBe("afObjLexBind2Instance.func() === afObjLexBind2Instance", "true");
>+
>+var obj = {
>+  method: function () {
>+    return () => this;
>+  }
>+};
>+
>+shouldBe("obj.method()() === obj", "true");
>+
>+var fake = {steal: obj.method()};
>+shouldBe("fake.steal() === obj", "true");
>+
>+var real = {borrow: obj.method};
>+shouldBe("real.borrow()() === real", "true");
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-others.js b/LayoutTests/js/script-tests/arrowfunction-others.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..a79931c3debcb5027ad14fd1547e5aba038b4b11
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-others.js
>@@ -0,0 +1,10 @@
>+// Inspired by mozilla tests
>+description('Tests for ES6 arrow function instanceof and typeof operators');
>+
>+var simpleArrowFunction = () => {};
>+
>+shouldBe("Object.getPrototypeOf(simpleArrowFunction)", "Function.prototype");
>+shouldBe("simpleArrowFunction instanceof Function", "true");
>+shouldBe("simpleArrowFunction.constructor == Function", "true");
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-tdz.js b/LayoutTests/js/script-tests/arrowfunction-tdz.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..aaf58fc6513edabde1dd6507496ae864b611fff9
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-tdz.js
>@@ -0,0 +1,26 @@
>+description('Tests for ES6 arrow function test tdz');
>+
>+var A = class A { };
>+var B = class B extends A {
>+  constructor(accessThisBeforeSuper) {
>+    if (accessThisBeforeSuper) {
>+      var f = () => this;
>+      super();
>+    } else {
>+      super();
>+    }
>+  }
>+};
>+
>+var isReferenceError = false;
>+try {
>+     new B(true);
>+} catch (e) {
>+    isReferenceError = e instanceof ReferenceError;
>+}
>+
>+shouldBe('isReferenceError', 'true');
>+
>+var e = new B(false);
>+
>+var successfullyParsed = true;
>diff --git a/LayoutTests/js/script-tests/arrowfunction-typeof.js b/LayoutTests/js/script-tests/arrowfunction-typeof.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..40a1d5846d0f3895606ff8eebc25da14f980f11b
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-typeof.js
>@@ -0,0 +1,16 @@
>+var af1 = () => {};
>+var af2 = (a) => {a + 1};
>+
>+shouldBe("typeof af1 === 'function'", "true");
>+shouldBe("typeof af1.prototype ==='undefined'", "true");
>+
>+shouldBe("typeof af2 === 'function'", "true");
>+shouldBe("typeof af2.prototype === 'undefined'", "true");
>+
>+shouldBe("typeof (()=>{}) === 'function'", "true");
>+shouldBe("typeof (()=>{}).prototype === 'undefined'", "true");
>+
>+shouldBe("typeof ((b) => {b + 1})==='function'", "true");
>+shouldBe("typeof ((b) => {b + 1}).prototype ==='undefined'", "true");
>+
>+var successfullyParsed = true;

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