Attachment 257377 Details for Bug 144956 – Patch

[patch] Patch

bug-144956-20150724000926.patch (text/plain), 149.11 KB, created by GSkachkov on 2015-07-23 14:10:41 PDT

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Creator: GSkachkov

Created: 2015-07-23 14:10:41 PDT

Size: 149.11 KB

patch

obsolete

>Subversion Revision: 187032
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 910e31b573c46e9c5057c031f8448946e0c3dc1b..8997d495562f121c7c83ab1b1a3b71b51fa9feec 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,171 @@
>+2015-07-23 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. Lexical bind of |this|
>+           constructor - the using of the command |new| for arrow function leads to runtime error
>+           call(), apply(), bind()  - methods can only pass in arguments, but has no effect on |this| 
>+
>+
>+        * 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):
>+        * bytecode/UnlinkedCodeBlock.cpp:
>+        (JSC::generateFunctionCodeBlock):
>+        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
>+        (JSC::UnlinkedFunctionExecutable::codeBlockFor):
>+        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
>+        * bytecode/UnlinkedCodeBlock.h:
>+        (JSC::ExecutableInfo::ExecutableInfo):
>+        (JSC::ExecutableInfo::isArrowFunction):
>+        (JSC::UnlinkedCodeBlock::isArrowFunction):
>+        * bytecompiler/BytecodeGenerator.cpp:
>+        (JSC::BytecodeGenerator::BytecodeGenerator):
>+        (JSC::BytecodeGenerator::emitNewFunctionCommon):
>+        (JSC::BytecodeGenerator::emitNewFunctionExpression):
>+        (JSC::BytecodeGenerator::emitNewArrowFunctionExpression):
>+        (JSC::BytecodeGenerator::emitNewDefaultConstructor):
>+        (JSC::BytecodeGenerator::emitLoadArrowFunctionThis):
>+        * bytecompiler/BytecodeGenerator.h:
>+        (JSC::BytecodeGenerator::arrowFunctionThisRegister):
>+        (JSC::BytecodeGenerator::makeFunction):
>+        * 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/DFGMayExit.cpp:
>+        (JSC::DFG::mayExit):
>+        * dfg/DFGNode.h:
>+        (JSC::DFG::Node::convertToPhantomNewFunction):
>+        (JSC::DFG::Node::hasCellOperand):
>+        * dfg/DFGNodeType.h:
>+        * dfg/DFGObjectAllocationSinkingPhase.cpp:
>+        * dfg/DFGPredictionPropagationPhase.cpp:
>+        (JSC::DFG::PredictionPropagationPhase::propagate):
>+        * dfg/DFGPromoteHeapAccess.h:
>+        (JSC::DFG::promoteHeapAccess):
>+        * dfg/DFGSafeToExecute.h:
>+        (JSC::DFG::safeToExecute):
>+        * dfg/DFGSpeculativeJIT.cpp:
>+        (JSC::DFG::SpeculativeJIT::compileLoadArrowFunctionThis):
>+        (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/DFGStoreBarrierInsertionPhase.cpp:
>+        * 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::compileNewFunction):
>+        (JSC::FTL::DFG::LowerDFGToLLVM::compileLoadArrowFunctionThis):
>+        * interpreter/Interpreter.cpp:
>+        * interpreter/Interpreter.h:
>+        * jit/JIT.cpp:
>+        (JSC::JIT::privateCompileMainPass):
>+        * jit/JIT.h:
>+        * jit/JITInlines.h:
>+        (JSC::JIT::callOperation):
>+        * jit/JITOpcodes.cpp:
>+        (JSC::JIT::emit_op_load_arrowfunction_this):
>+        (JSC::JIT::emit_op_new_func_exp):
>+        (JSC::JIT::emitNewFuncExprCommon):
>+        (JSC::JIT::emit_op_new_arrow_func_exp):
>+        * jit/JITOpcodes32_64.cpp:
>+        (JSC::JIT::emit_op_load_arrowfunction_this):
>+        * jit/JITOperations.cpp:
>+        * jit/JITOperations.h:
>+        * jsc.cpp:
>+        (functionHasBasicBlockExecuted):
>+        * llint/LLIntOffsetsExtractor.cpp:
>+        * llint/LLIntSlowPaths.cpp:
>+        (JSC::LLInt::getJSFunctionExpr):
>+        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
>+        (JSC::LLInt::setUpCall):
>+        * llint/LLIntSlowPaths.h:
>+        * llint/LowLevelInterpreter.asm:
>+        * llint/LowLevelInterpreter32_64.asm:
>+        * llint/LowLevelInterpreter64.asm:
>+        * parser/ASTBuilder.h:
>+        (JSC::ASTBuilder::createArrowFunctionExpr):
>+        * parser/NodeConstructors.h:
>+        (JSC::ArrowFuncExprNode::ArrowFuncExprNode):
>+        * parser/Nodes.h:
>+        (JSC::ExpressionNode::isArrowFuncExprNode):
>+        * runtime/Executable.cpp:
>+        (JSC::ScriptExecutable::newCodeBlockFor):
>+        * runtime/Executable.h:
>+        * runtime/JSArrowFunction.cpp: Added.
>+        (JSC::JSArrowFunction::destroy):
>+        (JSC::JSArrowFunction::create):
>+        (JSC::JSArrowFunction::JSArrowFunction):
>+        (JSC::JSArrowFunction::createWithInvalidatedReallocationWatchpoint):
>+        (JSC::JSArrowFunction::finishCreation):
>+        (JSC::JSArrowFunction::visitChildren):
>+        (JSC::JSArrowFunction::getConstructData):
>+        * runtime/JSArrowFunction.h: Added.
>+        (JSC::JSArrowFunction::allocationSize):
>+        (JSC::JSArrowFunction::createImpl):
>+        (JSC::JSArrowFunction::boundThis):
>+        (JSC::JSArrowFunction::createStructure):
>+        (JSC::JSArrowFunction::offsetOfThisValue):
>+        * runtime/JSFunction.h:
>+        * runtime/JSFunctionInlines.h:
>+        (JSC::JSFunction::JSFunction):
>+        * 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.
>+        (testCase):
>+
> 2015-07-18  Filip Pizlo  <fpizlo@apple.com>
> 
>         REGRESSION(186691): OSR entry is broken on loop headers that have no live variables
>diff --git a/Source/JavaScriptCore/CMakeLists.txt b/Source/JavaScriptCore/CMakeLists.txt
>index 94326d9a10248b1407bbd792507b9f81d01183ac..50eecb4d4c972c73eba01a6cf1aa5f73bb934f4f 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 74efa9d345d0cd07c6d3840f92da0982e0f46457..9b0d6e03a39fa813b0a478880937520d53f2e479 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 aaf3256296143f71bce56db9ea3c523a2ca1a438..405aef184391f5c090024ca547f89238f19e76c2 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>+++ b/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters
>@@ -2700,6 +2700,9 @@
>     <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 08f0d0f4c7f24a7eeee46cbb4a459de804e36b40..59c57ca541182663767af368e681ef38d089432b 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>+++ b/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>@@ -1125,6 +1125,8 @@
> 		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 */; };
>@@ -2885,6 +2887,8 @@
> 		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>"; };
>@@ -4497,6 +4501,8 @@
> 				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 1b6fa8de5b47daeb2e4cd562ad57e60889c349f9..52d1e80e9c93d56d3f5cbe4c02e75d30bf0af6be 100644
>--- a/Source/JavaScriptCore/bytecode/BytecodeList.json
>+++ b/Source/JavaScriptCore/bytecode/BytecodeList.json
>@@ -94,6 +94,7 @@
>             { "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 },
>@@ -128,7 +129,8 @@
>             { "name" : "op_get_property_enumerator", "length" : 3 },
>             { "name" : "op_enumerator_structure_pname", "length" : 4 },
>             { "name" : "op_enumerator_generic_pname", "length" : 4 },
>-            { "name" : "op_to_index_string", "length" : 3 }
>+            { "name" : "op_to_index_string", "length" : 3 },
>+            { "name" : "op_load_arrowfunction_this", "length" : 2 }
>         ]
>     },
>     {
>diff --git a/Source/JavaScriptCore/bytecode/BytecodeUseDef.h b/Source/JavaScriptCore/bytecode/BytecodeUseDef.h
>index 67c83b3116081e97a25738021030497e0c9cca9e..de5d57ac1d978c24b1fb2f1c5277d41b8f13ea2a 100644
>--- a/Source/JavaScriptCore/bytecode/BytecodeUseDef.h
>+++ b/Source/JavaScriptCore/bytecode/BytecodeUseDef.h
>@@ -55,6 +55,7 @@ void computeUsesForBytecodeOffset(
>     case op_create_out_of_band_arguments:
>         return;
>     case op_get_scope:
>+    case op_load_arrowfunction_this:
>     case op_to_this:
>     case op_check_tdz:
>     case op_profile_will_call:
>@@ -115,6 +116,7 @@ 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_push_name_scope:
>     case op_push_with_scope:
>@@ -307,6 +309,7 @@ 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:
>@@ -360,6 +363,7 @@ void computeDefsForBytecodeOffset(CodeBlock* codeBlock, unsigned bytecodeOffset,
>     case op_to_this:
>     case op_check_tdz:
>     case op_get_scope:
>+    case op_load_arrowfunction_this:
>     case op_create_direct_arguments:
>     case op_create_scoped_arguments:
>     case op_create_out_of_band_arguments:
>diff --git a/Source/JavaScriptCore/bytecode/CodeBlock.cpp b/Source/JavaScriptCore/bytecode/CodeBlock.cpp
>index d1124a748567ba82a6eb6afad7c100de5ca2af65..cf9b7473d835eb7366aa15897e022927a87fbce9 100644
>--- a/Source/JavaScriptCore/bytecode/CodeBlock.cpp
>+++ b/Source/JavaScriptCore/bytecode/CodeBlock.cpp
>@@ -768,6 +768,11 @@ void CodeBlock::dumpBytecode(
>             printLocationOpAndRegisterOperand(out, exec, location, it, "get_scope", r0);
>             break;
>         }
>+        case op_load_arrowfunction_this: {
>+            int r0 = (++it)->u.operand;
>+            printLocationOpAndRegisterOperand(out, exec, location, it, "load_arrowfunction_this", r0);
>+            break;
>+        }
>         case op_create_direct_arguments: {
>             int r0 = (++it)->u.operand;
>             printLocationAndOp(out, exec, location, it, "create_direct_arguments");
>@@ -1297,6 +1302,15 @@ 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/bytecode/UnlinkedCodeBlock.cpp b/Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.cpp
>index 0e1c8fb6886d561f9b414d9a30555f44cf3c2151..4f9f14189ce774b60a3114e626be02d8fffe2284 100644
>--- a/Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.cpp
>+++ b/Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.cpp
>@@ -55,7 +55,7 @@ const ClassInfo UnlinkedFunctionCodeBlock::s_info = { "UnlinkedFunctionCodeBlock
> static UnlinkedFunctionCodeBlock* generateFunctionCodeBlock(
>     VM& vm, UnlinkedFunctionExecutable* executable, const SourceCode& source,
>     CodeSpecializationKind kind, DebuggerMode debuggerMode, ProfilerMode profilerMode,
>-    UnlinkedFunctionKind functionKind, ParserError& error)
>+    UnlinkedFunctionKind functionKind, ParserError& error, bool isArrowFunction)
> {
>     JSParserBuiltinMode builtinMode = executable->isBuiltinFunction() ? JSParserBuiltinMode::Builtin : JSParserBuiltinMode::NotBuiltin;
>     JSParserStrictMode strictMode = executable->isInStrictContext() ? JSParserStrictMode::Strict : JSParserStrictMode::NotStrict;
>@@ -72,7 +72,7 @@ static UnlinkedFunctionCodeBlock* generateFunctionCodeBlock(
>     executable->recordParse(function->features(), function->hasCapturedVariables());
>     
>     UnlinkedFunctionCodeBlock* result = UnlinkedFunctionCodeBlock::create(&vm, FunctionCode,
>-        ExecutableInfo(function->needsActivation(), function->usesEval(), function->isStrictMode(), kind == CodeForConstruct, functionKind == UnlinkedBuiltinFunction, executable->constructorKind()));
>+        ExecutableInfo(function->needsActivation(), function->usesEval(), function->isStrictMode(), kind == CodeForConstruct, functionKind == UnlinkedBuiltinFunction, executable->constructorKind(), isArrowFunction));
>     auto generator(std::make_unique<BytecodeGenerator>(vm, function.get(), result, debuggerMode, profilerMode, executable->parentScopeTDZVariables()));
>     error = generator->generate();
>     if (error.isValid())
>@@ -80,7 +80,7 @@ static UnlinkedFunctionCodeBlock* generateFunctionCodeBlock(
>     return result;
> }
> 
>-UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(VM* vm, Structure* structure, const SourceCode& source, RefPtr<SourceProvider>&& sourceOverride, FunctionBodyNode* node, UnlinkedFunctionKind kind, VariableEnvironment& parentScopeTDZVariables)
>+UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(VM* vm, Structure* structure, const SourceCode& source, RefPtr<SourceProvider>&& sourceOverride, FunctionBodyNode* node, UnlinkedFunctionKind kind, VariableEnvironment& parentScopeTDZVariables, bool isArrowFunction)
>     : Base(*vm, structure)
>     , m_name(node->ident())
>     , m_inferredName(node->inferredName())
>@@ -103,6 +103,7 @@ UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(VM* vm, Structure* struct
>     , m_isBuiltinFunction(kind == UnlinkedBuiltinFunction)
>     , m_constructorKind(static_cast<unsigned>(node->constructorKind()))
>     , m_functionMode(node->functionMode())
>+    , m_isArrowFunction(isArrowFunction)
> {
>     ASSERT(m_constructorKind == static_cast<unsigned>(node->constructorKind()));
>     m_parentScopeTDZVariables.swap(parentScopeTDZVariables);
>@@ -185,7 +186,7 @@ UnlinkedFunctionExecutable* UnlinkedFunctionExecutable::fromGlobalCode(
> 
> UnlinkedFunctionCodeBlock* UnlinkedFunctionExecutable::codeBlockFor(
>     VM& vm, const SourceCode& source, CodeSpecializationKind specializationKind, 
>-    DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
>+    DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error, bool isArrowFunction)
> {
>     switch (specializationKind) {
>     case CodeForCall:
>@@ -201,7 +202,7 @@ UnlinkedFunctionCodeBlock* UnlinkedFunctionExecutable::codeBlockFor(
>     UnlinkedFunctionCodeBlock* result = generateFunctionCodeBlock(
>         vm, this, source, specializationKind, debuggerMode, profilerMode, 
>         isBuiltinFunction() ? UnlinkedBuiltinFunction : UnlinkedNormalFunction, 
>-        error);
>+        error, isArrowFunction);
>     
>     if (error.isValid())
>         return nullptr;
>@@ -233,6 +234,7 @@ UnlinkedCodeBlock::UnlinkedCodeBlock(VM* vm, Structure* structure, CodeType code
>     , m_hasCapturedVariables(false)
>     , m_isBuiltinFunction(info.isBuiltinFunction())
>     , m_constructorKind(static_cast<unsigned>(info.constructorKind()))
>+    , m_isArrowFunction(info.isArrowFunction())
>     , m_firstLine(0)
>     , m_lineCount(0)
>     , m_endColumn(UINT_MAX)
>diff --git a/Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.h b/Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.h
>index 550a024cb7c41f4627663abdc687d9981c290c45..beade90d3c297bf305b9927aec15f0d9998494fa 100644
>--- a/Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.h
>+++ b/Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.h
>@@ -66,13 +66,14 @@ typedef unsigned UnlinkedObjectAllocationProfile;
> typedef unsigned UnlinkedLLIntCallLinkInfo;
> 
> struct ExecutableInfo {
>-    ExecutableInfo(bool needsActivation, bool usesEval, bool isStrictMode, bool isConstructor, bool isBuiltinFunction, ConstructorKind constructorKind)
>+    ExecutableInfo(bool needsActivation, bool usesEval, bool isStrictMode, bool isConstructor, bool isBuiltinFunction, ConstructorKind constructorKind, bool isArrowFunction)
>         : m_needsActivation(needsActivation)
>         , m_usesEval(usesEval)
>         , m_isStrictMode(isStrictMode)
>         , m_isConstructor(isConstructor)
>         , m_isBuiltinFunction(isBuiltinFunction)
>         , m_constructorKind(static_cast<unsigned>(constructorKind))
>+        , m_isArrowFunction(isArrowFunction)
>     {
>         ASSERT(m_constructorKind == static_cast<unsigned>(constructorKind));
>     }
>@@ -82,6 +83,7 @@ struct ExecutableInfo {
>     bool isStrictMode() const { return m_isStrictMode; }
>     bool isConstructor() const { return m_isConstructor; }
>     bool isBuiltinFunction() const { return m_isBuiltinFunction; }
>+    bool isArrowFunction()  const { return m_isArrowFunction; }
>     ConstructorKind constructorKind() const { return static_cast<ConstructorKind>(m_constructorKind); }
> 
> private:
>@@ -91,6 +93,7 @@ private:
>     unsigned m_isConstructor : 1;
>     unsigned m_isBuiltinFunction : 1;
>     unsigned m_constructorKind : 2;
>+    unsigned m_isArrowFunction : 1;
> };
> 
> enum UnlinkedFunctionKind {
>@@ -107,10 +110,10 @@ public:
>     typedef JSCell Base;
>     static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
> 
>-    static UnlinkedFunctionExecutable* create(VM* vm, const SourceCode& source, FunctionBodyNode* node, UnlinkedFunctionKind unlinkedFunctionKind, VariableEnvironment& parentScopeTDZVariables, RefPtr<SourceProvider>&& sourceOverride = nullptr)
>+    static UnlinkedFunctionExecutable* create(VM* vm, const SourceCode& source, FunctionBodyNode* node, UnlinkedFunctionKind unlinkedFunctionKind, VariableEnvironment& parentScopeTDZVariables, RefPtr<SourceProvider>&& sourceOverride = nullptr, bool isArrowFunction = false)
>     {
>         UnlinkedFunctionExecutable* instance = new (NotNull, allocateCell<UnlinkedFunctionExecutable>(vm->heap))
>-            UnlinkedFunctionExecutable(vm, vm->unlinkedFunctionExecutableStructure.get(), source, WTF::move(sourceOverride), node, unlinkedFunctionKind, parentScopeTDZVariables);
>+            UnlinkedFunctionExecutable(vm, vm->unlinkedFunctionExecutableStructure.get(), source, WTF::move(sourceOverride), node, unlinkedFunctionKind, parentScopeTDZVariables, isArrowFunction);
>         instance->finishCreation(*vm);
>         return instance;
>     }
>@@ -139,7 +142,7 @@ public:
> 
>     UnlinkedFunctionCodeBlock* codeBlockFor(
>         VM&, const SourceCode&, CodeSpecializationKind, DebuggerMode, ProfilerMode, 
>-        ParserError&);
>+        ParserError&, bool);
> 
>     static UnlinkedFunctionExecutable* fromGlobalCode(
>         const Identifier&, ExecState&, const SourceCode&, JSObject*& exception, 
>@@ -170,9 +173,11 @@ public:
>     bool isBuiltinFunction() const { return m_isBuiltinFunction; }
>     bool isClassConstructorFunction() const { return constructorKind() != ConstructorKind::None; }
>     const VariableEnvironment* parentScopeTDZVariables() const { return &m_parentScopeTDZVariables; }
>+    bool isArrowFunction() const { return m_isArrowFunction; }
> 
> private:
>-    UnlinkedFunctionExecutable(VM*, Structure*, const SourceCode&, RefPtr<SourceProvider>&& sourceOverride, FunctionBodyNode*, UnlinkedFunctionKind, VariableEnvironment&);
>+    UnlinkedFunctionExecutable(VM*, Structure*, const SourceCode&, RefPtr<SourceProvider>&& sourceOverride, FunctionBodyNode*, UnlinkedFunctionKind, VariableEnvironment&, bool);
>+
>     WriteBarrier<UnlinkedFunctionCodeBlock> m_codeBlockForCall;
>     WriteBarrier<UnlinkedFunctionCodeBlock> m_codeBlockForConstruct;
> 
>@@ -203,6 +208,7 @@ private:
>     unsigned m_isBuiltinFunction : 1;
>     unsigned m_constructorKind : 2;
>     unsigned m_functionMode : 1; // FunctionMode
>+    unsigned m_isArrowFunction : 1;
> 
> protected:
>     void finishCreation(VM& vm)
>@@ -272,6 +278,7 @@ public:
>     bool isConstructor() const { return m_isConstructor; }
>     bool isStrictMode() const { return m_isStrictMode; }
>     bool usesEval() const { return m_usesEval; }
>+    bool isArrowFunction() const { return m_isArrowFunction; }
> 
>     bool needsFullScopeChain() const { return m_needsFullScopeChain; }
> 
>@@ -550,6 +557,7 @@ private:
>     unsigned m_hasCapturedVariables : 1;
>     unsigned m_isBuiltinFunction : 1;
>     unsigned m_constructorKind : 2;
>+    unsigned m_isArrowFunction : 1;
> 
>     unsigned m_firstLine;
>     unsigned m_lineCount;
>diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
>index 1940d943668037216b54e1b648e23ba38f97dd7d..8a6721e4a8293123112dd1fe032add9fc977fa36 100644
>--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
>+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
>@@ -501,7 +501,7 @@ BytecodeGenerator::BytecodeGenerator(VM& vm, FunctionNode* functionNode, Unlinke
>         }
>     }
>     
>-    if (isConstructor()) {
>+    if (isConstructor() && !codeBlock->isArrowFunction()) {
>         if (constructorKind() == ConstructorKind::Derived) {
>             m_newTargetRegister = addVar();
>             emitMove(m_newTargetRegister, &m_thisRegister);
>@@ -522,6 +522,10 @@ BytecodeGenerator::BytecodeGenerator(VM& vm, FunctionNode* functionNode, Unlinke
>         pushScopedControlFlowContext();
>     m_symbolTableStack.append(SymbolTableStackEntry{ Strong<SymbolTable>(*m_vm, m_symbolTable), m_lexicalEnvironmentRegister, false, symbolTableConstantIndex });
>     m_TDZStack.append(std::make_pair(*parentScopeTDZVariables, false));
>+    if (codeBlock->isArrowFunction()) {
>+        emitLoadArrowFunctionThis();
>+        emitMove(&m_thisRegister, m_arrowFunctionThisRegister);
>+    }
> }
> 
> BytecodeGenerator::BytecodeGenerator(VM& vm, EvalNode* evalNode, UnlinkedEvalCodeBlock* codeBlock, DebuggerMode debuggerMode, ProfilerMode profilerMode, const VariableEnvironment* parentScopeTDZVariables)
>@@ -2080,22 +2084,44 @@ 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();
>-    unsigned index = m_codeBlock->addFunctionExpr(makeFunction(function));
>-
>-    emitOpcode(op_new_func_exp);
>-    instructions().append(r0->index());
>+    ASSERT(opcodeID == op_new_func_exp || opcodeID == op_new_arrow_func_exp);
>+    
>+    FunctionBodyNode* function = func->body();
>+    unsigned index = m_codeBlock->addFunctionExpr(makeFunction(function, opcodeID == op_new_arrow_func_exp));
>+    
>+    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);
>@@ -2654,6 +2680,14 @@ void BytecodeGenerator::allocateAndEmitScope()
>     emitGetScope();
> }
> 
>+void BytecodeGenerator::emitLoadArrowFunctionThis()
>+{
>+    m_arrowFunctionThisRegister = addVar();
>+    m_arrowFunctionThisRegister->ref();
>+    emitOpcode(op_load_arrowfunction_this);
>+    instructions().append(arrowFunctionThisRegister()->index());
>+}
>+    
> void BytecodeGenerator::emitComplexPopScopes(RegisterID* scope, ControlFlowContext* topScope, ControlFlowContext* bottomScope)
> {
>     while (topScope > bottomScope) {
>diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
>index e3a93978604a4e9e83c5b850a0743cddd8d44a99..1108151338045e6575a13242367bc988d684fb4c 100644
>--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
>+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
>@@ -300,6 +300,9 @@ namespace JSC {
>         RegisterID* newTarget() { return m_newTargetRegister; }
> 
>         RegisterID* scopeRegister() { return m_scopeRegister; }
>+        
>+        RegisterID* arrowFunctionThisRegister() { return m_arrowFunctionThisRegister; }
>+        
> 
>         // Returns the next available temporary register. Registers returned by
>         // newTemporary require a modified form of reference counting: any
>@@ -474,6 +477,11 @@ 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);
>@@ -648,6 +656,7 @@ namespace JSC {
>         ALWAYS_INLINE void rewindUnaryOp();
> 
>         void allocateAndEmitScope();
>+        void emitLoadArrowFunctionThis();
>         void emitComplexPopScopes(RegisterID*, ControlFlowContext* topScope, ControlFlowContext* bottomScope);
> 
>         typedef HashMap<double, JSValue> NumberMap;
>@@ -697,11 +706,12 @@ namespace JSC {
> 
>         unsigned addConstantBuffer(unsigned length);
>         
>-        UnlinkedFunctionExecutable* makeFunction(FunctionBodyNode* body)
>+        UnlinkedFunctionExecutable* makeFunction(FunctionBodyNode* body, bool isArrowFunction = false)
>         {
>             VariableEnvironment variablesUnderTDZ;
>             getVariablesUnderTDZ(variablesUnderTDZ);
>-            return UnlinkedFunctionExecutable::create(m_vm, m_scopeNode->source(), body, isBuiltinFunction() ? UnlinkedBuiltinFunction : UnlinkedNormalFunction, variablesUnderTDZ);
>+            return UnlinkedFunctionExecutable::create(m_vm, m_scopeNode->source(), body, isBuiltinFunction() ? UnlinkedBuiltinFunction : UnlinkedNormalFunction, variablesUnderTDZ, nullptr, isArrowFunction);
>+
>         }
> 
>         void getVariablesUnderTDZ(VariableEnvironment&);
>@@ -745,6 +755,7 @@ namespace JSC {
>         RegisterID m_thisRegister;
>         RegisterID m_calleeRegister;
>         RegisterID* m_scopeRegister { nullptr };
>+        RegisterID* m_arrowFunctionThisRegister { nullptr };
>         RegisterID* m_argumentsRegister { nullptr };
>         RegisterID* m_lexicalEnvironmentRegister { nullptr };
>         RegisterID* m_emptyValueRegister { nullptr };
>diff --git a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
>index 27a846887091a1e2d6fa05a78db79ecd4f0a9dab..1e9b165422bb6b61ec23031bfd16818589a551dd 100644
>--- a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
>+++ b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
>@@ -3057,6 +3057,14 @@ 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..df43616ef27cb5a46eac3234fbaccac31d0084c2 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());
>@@ -1688,6 +1693,16 @@ bool AbstractInterpreter<AbstractStateType>::executeEffects(unsigned clobberLimi
>         forNode(node).setType(m_graph, SpecObjectOther);
>         break;
> 
>+    case LoadArrowFunctionThis:
>+        if (JSValue base = forNode(node->child1()).m_value) {
>+            if (JSArrowFunction* function = jsDynamicCast<JSArrowFunction*>(base)) {
>+                setConstant(node, *m_graph.freeze(function->boundThis()));
>+                break;
>+            }
>+        }
>+        forNode(node).setType(m_graph, SpecFinalObject);
>+        break;
>+            
>     case SkipScope: {
>         JSValue child = forNode(node->child1()).value();
>         if (child) {
>diff --git a/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp b/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
>index 99a34b91365bbf609c6981c8a6b0ad235e87104f..f7d251ed3bcfdfa2b4803b12e66f15d319eeb2c9 100644
>--- a/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
>@@ -3746,6 +3746,17 @@ bool ByteCodeParser::parseBlock(unsigned limit)
>             set(VirtualRegister(currentInstruction[1].u.operand), result);
>             NEXT_OPCODE(op_get_scope);
>         }
>+
>+        case op_load_arrowfunction_this: {
>+            Node* callee = get(VirtualRegister(JSStack::Callee));
>+            Node* result;
>+            if (JSArrowFunction* function = callee->dynamicCastConstant<JSArrowFunction*>())
>+                result = weakJSConstant(function->boundThis());
>+            else
>+                result = addToGraph(LoadArrowFunctionThis, callee);
>+            set(VirtualRegister(currentInstruction[1].u.operand), result);
>+            NEXT_OPCODE(op_load_arrowfunction_this);
>+        }
>             
>         case op_create_direct_arguments: {
>             noticeArgumentsUse();
>@@ -3803,6 +3814,18 @@ 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 f9b5e7755bb05a383c96be27c681a9366d5a62ee..7f54308485291593fb75f6bbc069baa3b6cd1325 100644
>--- a/Source/JavaScriptCore/dfg/DFGCapabilities.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGCapabilities.cpp
>@@ -193,6 +193,7 @@ CapabilityLevel capabilityLevel(OpcodeID opcodeID, CodeBlock* codeBlock, Instruc
>     case op_switch_char:
>     case op_in:
>     case op_get_scope:
>+    case op_load_arrowfunction_this:
>     case op_get_from_scope:
>     case op_get_enumerable_length:
>     case op_has_generic_property:
>@@ -205,6 +206,7 @@ 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:
>     case op_get_parent_scope:
>         return CanCompileAndInline;
>diff --git a/Source/JavaScriptCore/dfg/DFGClobberize.h b/Source/JavaScriptCore/dfg/DFGClobberize.h
>index 5c6d17dcd854fa391e255065686daff09ccbf434..4ea224ab77cbcec629cd9bca4ef77d6482c3ff42 100644
>--- a/Source/JavaScriptCore/dfg/DFGClobberize.h
>+++ b/Source/JavaScriptCore/dfg/DFGClobberize.h
>@@ -139,6 +139,7 @@ void clobberize(Graph& graph, Node* node, const ReadFunctor& read, const WriteFu
>     case ArithCos:
>     case ArithLog:
>     case GetScope:
>+    case LoadArrowFunctionThis:
>     case SkipScope:
>     case StringCharCodeAt:
>     case StringFromCharCode:
>@@ -951,7 +952,8 @@ 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..8d97415730c78c5fed4c1a962d1713654c2a47b1 100644
>--- a/Source/JavaScriptCore/dfg/DFGDoesGC.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGDoesGC.cpp
>@@ -99,6 +99,7 @@ bool doesGC(Graph& graph, Node* node)
>     case GetButterfly:
>     case CheckArray:
>     case GetScope:
>+    case LoadArrowFunctionThis:
>     case SkipScope:
>     case GetClosureVar:
>     case PutClosureVar:
>@@ -230,6 +231,7 @@ 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..c82816d5c421071ba3fc6d08a267b890e97d9605 100644
>--- a/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
>@@ -948,7 +948,13 @@ private:
>             speculateForBarrier(node->child2());
>             break;
>         }
>-            
>+
>+        case LoadArrowFunctionThis: {
>+            fixEdge<FinalObjectUse>(node->child1());
>+            node->convertToIdentity();
>+            break;
>+        }
>+
>         case SkipScope:
>         case GetScope:
>         case GetGetter:
>@@ -1262,7 +1268,15 @@ 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/DFGMayExit.cpp b/Source/JavaScriptCore/dfg/DFGMayExit.cpp
>index 4631ecd561c78bd489eddadc8ffe57f989d9b7fc..b18f7e2ef1ac16daa8c7641de382dfde5cbd8efc 100644
>--- a/Source/JavaScriptCore/dfg/DFGMayExit.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGMayExit.cpp
>@@ -108,6 +108,7 @@ bool mayExit(Graph& graph, Node* node)
>     case GetCallee:
>     case GetArgumentCount:
>     case GetScope:
>+    case LoadArrowFunctionThis:
>     case PhantomLocal:
>     case CountExecution:
>     case Jump:
>diff --git a/Source/JavaScriptCore/dfg/DFGNode.h b/Source/JavaScriptCore/dfg/DFGNode.h
>index 109a5a6cc4f73d30f8df6eebc34d7a2f977ce36e..44be6991879893fa340e8c339c7d248dcc273631 100644
>--- a/Source/JavaScriptCore/dfg/DFGNode.h
>+++ b/Source/JavaScriptCore/dfg/DFGNode.h
>@@ -1287,6 +1287,7 @@ 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..5ba9693dcccac850456f468aad0dd7216f24a1bc 100644
>--- a/Source/JavaScriptCore/dfg/DFGNodeType.h
>+++ b/Source/JavaScriptCore/dfg/DFGNodeType.h
>@@ -197,6 +197,7 @@ namespace JSC { namespace DFG {
>     macro(MultiPutByOffset, NodeMustGenerate) \
>     macro(GetArrayLength, NodeResultInt32) \
>     macro(GetTypedArrayByteOffset, NodeResultInt32) \
>+    macro(LoadArrowFunctionThis, NodeResultJS) \
>     macro(GetScope, NodeResultJS) \
>     macro(SkipScope, NodeResultJS) \
>     macro(GetClosureVar, NodeResultJS) \
>@@ -295,6 +296,8 @@ 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/DFGObjectAllocationSinkingPhase.cpp b/Source/JavaScriptCore/dfg/DFGObjectAllocationSinkingPhase.cpp
>index 41976ad30926cd6f4ea096f3c17ebf1d24a2e918..fab8de7e098489db26ba6062acf5b5765701d311 100644
>--- a/Source/JavaScriptCore/dfg/DFGObjectAllocationSinkingPhase.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGObjectAllocationSinkingPhase.cpp
>@@ -839,7 +839,8 @@ private:
>             }
>             break;
>         }
>-
>+            
>+        case NewArrowFunction: 
>         case NewFunction: {
>             if (node->castOperand<FunctionExecutable*>()->singletonFunction()->isStillValid()) {
>                 m_heap.escape(node->child1().node());
>@@ -981,6 +982,14 @@ private:
>                 m_heap.escape(node->child1().node());
>             break;
> 
>+        /*TODO: Double check if it works correct. This wasn't reached during debug*/
>+        case LoadArrowFunctionThis:
>+            target = m_heap.onlyLocalAllocation(node->child1().node());
>+            if (target && target->isFunctionAllocation())
>+                exactRead = FunctionActivationPLoc;
>+            else
>+                m_heap.escape(node->child1().node());
>+            break;
>         case GetScope:
>             target = m_heap.onlyLocalAllocation(node->child1().node());
>             if (target && target->isFunctionAllocation())
>diff --git a/Source/JavaScriptCore/dfg/DFGPredictionPropagationPhase.cpp b/Source/JavaScriptCore/dfg/DFGPredictionPropagationPhase.cpp
>index cde09bf121b21f8a4feb60dfa24fb420b6a9baba..5cbd03d3b1b47bf46ebc90e6b715fd253c1ecee0 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;
>@@ -587,11 +588,12 @@ private:
>             // These don't get inserted until we go into SSA.
>             RELEASE_ASSERT_NOT_REACHED();
>             break;
>-
>+    
>         case GetScope:
>+        case LoadArrowFunctionThis:
>             changed |= setPrediction(SpecObjectOther);
>             break;
>-            
>+
>         case In:
>             changed |= setPrediction(SpecBoolean);
>             break;
>diff --git a/Source/JavaScriptCore/dfg/DFGPromoteHeapAccess.h b/Source/JavaScriptCore/dfg/DFGPromoteHeapAccess.h
>index 2bf2875c1ce5861bf46c6cbbb2c4e497dd6aba64..5c7ac9fd4ea71af2429e211ad1605196451647fb 100644
>--- a/Source/JavaScriptCore/dfg/DFGPromoteHeapAccess.h
>+++ b/Source/JavaScriptCore/dfg/DFGPromoteHeapAccess.h
>@@ -69,7 +69,12 @@ void promoteHeapAccess(Node* node, const WriteFunctor& write, const ReadFunctor&
>         if (node->child1()->isPhantomActivationAllocation())
>             read(PromotedHeapLocation(ActivationScopePLoc, node->child1()));
>         break;
>-
>+    
>+    /*TODO: Has to be checked. This code was reached during debug*/
>+    case LoadArrowFunctionThis:
>+        if (node->child1()->isPhantomFunctionAllocation())
>+            read(PromotedHeapLocation(FunctionActivationPLoc, node->child1()));
>+        break;
>     case GetScope:
>         if (node->child1()->isPhantomFunctionAllocation())
>             read(PromotedHeapLocation(FunctionActivationPLoc, node->child1()));
>diff --git a/Source/JavaScriptCore/dfg/DFGSafeToExecute.h b/Source/JavaScriptCore/dfg/DFGSafeToExecute.h
>index 953b54c21f739d07de4645db6b7475c1f07bae61..b7e91408181eab3cb8b82b384e382e33b7d79eb7 100644
>--- a/Source/JavaScriptCore/dfg/DFGSafeToExecute.h
>+++ b/Source/JavaScriptCore/dfg/DFGSafeToExecute.h
>@@ -172,6 +172,7 @@ bool safeToExecute(AbstractStateType& state, Graph& graph, Node* node)
>     case Arrayify:
>     case ArrayifyToStructure:
>     case GetScope:
>+    case LoadArrowFunctionThis:
>     case SkipScope:
>     case GetClosureVar:
>     case PutClosureVar:
>@@ -230,6 +231,7 @@ 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 f3f8af7a52d50f9a2e71c4f90199847bf0500d5e..f149298bee30d156766f08ae76785c56c8ce0dd5 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"
>@@ -4471,6 +4472,15 @@ void SpeculativeJIT::compileGetScope(Node* node)
>     cellResult(result.gpr(), node);
> }
> 
>+    
>+void SpeculativeJIT::compileLoadArrowFunctionThis(Node* node)
>+{
>+    SpeculateCellOperand function(this, node->child1());
>+    GPRTemporary result(this, Reuse, function);
>+    m_jit.loadPtr(JITCompiler::Address(function.gpr(), JSArrowFunction::offsetOfThisValue()), result.gpr());
>+    cellResult(result.gpr(), node);
>+}
>+    
> void SpeculativeJIT::compileSkipScope(Node* node)
> {
>     SpeculateCellOperand scope(this, node->child1());
>@@ -4575,56 +4585,74 @@ 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 a5c44547da64bc2b63f073a1711e6a11806f595b..1bbb86b5833d51850920c41e884acbc1246a00f8 100644
>--- a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h
>+++ b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h
>@@ -1211,6 +1211,12 @@ 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)
>     {
>@@ -1617,6 +1623,11 @@ 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));
>@@ -2188,6 +2199,7 @@ public:
>     void compileGetByValOnScopedArguments(Node*);
>     
>     void compileGetScope(Node*);
>+    void compileLoadArrowFunctionThis(Node*);
>     void compileSkipScope(Node*);
> 
>     void compileGetArrayLength(Node*);
>@@ -2219,7 +2231,8 @@ 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..6c5cd7d61d19f587777b7d46d36320d9e7621780 100644
>--- a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp
>@@ -3665,7 +3665,11 @@ void SpeculativeJIT::compile(Node* node)
>     case GetScope:
>         compileGetScope(node);
>         break;
>-        
>+
>+    case LoadArrowFunctionThis:
>+        compileLoadArrowFunctionThis(node);
>+        break;
>+            
>     case SkipScope:
>         compileSkipScope(node);
>         break;
>@@ -4306,11 +4310,12 @@ 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..949d5e62ec509584090996bb55a88ef0e715779b 100644
>--- a/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp
>@@ -3712,7 +3712,11 @@ void SpeculativeJIT::compile(Node* node)
>     case GetScope:
>         compileGetScope(node);
>         break;
>-        
>+            
>+    case LoadArrowFunctionThis:
>+        compileLoadArrowFunctionThis(node);
>+        break;
>+            
>     case SkipScope:
>         compileSkipScope(node);
>         break;
>@@ -4315,11 +4319,15 @@ 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/DFGStoreBarrierInsertionPhase.cpp b/Source/JavaScriptCore/dfg/DFGStoreBarrierInsertionPhase.cpp
>index 66acda29b64f8381a06975b92b8320ca86998a3b..d20c5ddfc65982043da6120bd19e56a3e6743e47 100644
>--- a/Source/JavaScriptCore/dfg/DFGStoreBarrierInsertionPhase.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGStoreBarrierInsertionPhase.cpp
>@@ -300,6 +300,7 @@ private:
>             case CreateDirectArguments:
>             case CreateScopedArguments:
>             case CreateClonedArguments:
>+            case NewArrowFunction:
>             case NewFunction:
>                 // Nodes that allocate get to set their epoch because for those nodes we know
>                 // that they will be the newest object in the heap.
>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..375dfd2177c0ab5455743bda9492b65279c3d79b 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:
>@@ -142,6 +143,7 @@ inline CapabilityLevel canCompile(Node* node)
>     case CountExecution:
>     case GetExecutable:
>     case GetScope:
>+    case LoadArrowFunctionThis:
>     case GetCallee:
>     case GetArgumentCount:
>     case ToString:
>diff --git a/Source/JavaScriptCore/ftl/FTLIntrinsicRepository.h b/Source/JavaScriptCore/ftl/FTLIntrinsicRepository.h
>index 9b3441417e16166d0ec1fd3f6ce96f7945f228b4..125e4feca36c58e216256a7c59b2844ec85f08ad 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 0e1ec09d510909f45bb17349d56c89d8c67fd337..7023124cf1389cd6042ae495d72568b61c59492d 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();
>@@ -702,6 +704,9 @@ private:
>         case GetScope:
>             compileGetScope();
>             break;
>+        case LoadArrowFunctionThis:
>+            compileLoadArrowFunctionThis();
>+            break;
>         case SkipScope:
>             compileSkipScope();
>             break;
>@@ -3099,40 +3104,62 @@ 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);
>         
>@@ -4057,6 +4084,11 @@ private:
>         setJSValue(m_out.loadPtr(lowCell(m_node->child1()), m_heaps.JSFunction_scope));
>     }
>     
>+    void compileLoadArrowFunctionThis()
>+    {
>+        setJSValue(m_out.loadPtr(lowCell(m_node->child1()), m_heaps.JSArrowFunction_this));
>+    }
>+    
>     void compileSkipScope()
>     {
>         setJSValue(m_out.loadPtr(lowCell(m_node->child1()), m_heaps.JSScope_next));
>diff --git a/Source/JavaScriptCore/interpreter/Interpreter.cpp b/Source/JavaScriptCore/interpreter/Interpreter.cpp
>index 687140e695c970655996d9e886f1241a623f21f3..8de524b7b1d3023e535ae7b2ba77fd6b87e8bb8a 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/interpreter/Interpreter.h b/Source/JavaScriptCore/interpreter/Interpreter.h
>index ef4ec0d66c04dd28fc9dc054448830c7690f5243..caee458952cec92fbcf74c3e9923d0f0dc7834b6 100644
>--- a/Source/JavaScriptCore/interpreter/Interpreter.h
>+++ b/Source/JavaScriptCore/interpreter/Interpreter.h
>@@ -31,6 +31,7 @@
> #define Interpreter_h
> 
> #include "ArgList.h"
>+#include "JSArrowFunction.h"
> #include "JSCJSValue.h"
> #include "JSCell.h"
> #include "JSObject.h"
>@@ -50,6 +51,7 @@ namespace JSC {
>     class ExecutableBase;
>     class FunctionExecutable;
>     class VM;
>+    class JSArrowFunction;
>     class JSFunction;
>     class JSGlobalObject;
>     class LLIntOffsetsExtractor;
>diff --git a/Source/JavaScriptCore/jit/JIT.cpp b/Source/JavaScriptCore/jit/JIT.cpp
>index 9af332eb78e189ae6a53b22350af77b5f9d7eb2b..17b1de626cc2ec23803139b724ed08787d2a818e 100644
>--- a/Source/JavaScriptCore/jit/JIT.cpp
>+++ b/Source/JavaScriptCore/jit/JIT.cpp
>@@ -219,6 +219,7 @@ void JIT::privateCompileMainPass()
>         DEFINE_OP(op_end)
>         DEFINE_OP(op_enter)
>         DEFINE_OP(op_get_scope)
>+        DEFINE_OP(op_load_arrowfunction_this)
>         DEFINE_OP(op_eq)
>         DEFINE_OP(op_eq_null)
>         case op_get_by_id_out_of_line:
>@@ -259,6 +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 02139634b1dfed610562decb578db38d6b16034e..ac24a614f18ca12d541bbed6a1156d4c29d2c959 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;
>@@ -479,6 +481,7 @@ namespace JSC {
>         void emit_op_end(Instruction*);
>         void emit_op_enter(Instruction*);
>         void emit_op_get_scope(Instruction*);
>+        void emit_op_load_arrowfunction_this(Instruction*);
>         void emit_op_eq(Instruction*);
>         void emit_op_eq_null(Instruction*);
>         void emit_op_get_by_id(Instruction*);
>@@ -520,6 +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*);
>@@ -635,6 +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);
>@@ -704,6 +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 a49484a3e803bc8a475926514b10b0f1fe198073..71f6a8d8ce1fd7e1da1f3ce3bd928c022389667d 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 c85871b249b0d31eb778fd7f20ba3d91ef143ce7..81461b9521f1418c47a74499d6445e6b3c2e1479 100644
>--- a/Source/JavaScriptCore/jit/JITOpcodes.cpp
>+++ b/Source/JavaScriptCore/jit/JITOpcodes.cpp
>@@ -35,6 +35,7 @@
> #include "Heap.h"
> #include "JITInlines.h"
> #include "JSArray.h"
>+#include "JSArrowFunction.h"
> #include "JSCell.h"
> #include "JSFunction.h"
> #include "JSNameScope.h"
>@@ -687,6 +688,14 @@ void JIT::emit_op_get_scope(Instruction* currentInstruction)
>     loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT0);
>     emitStoreCell(dst, regT0);
> }
>+    
>+void JIT::emit_op_load_arrowfunction_this(Instruction* currentInstruction)
>+{
>+    int dst = currentInstruction[1].u.operand;
>+    emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
>+    loadPtr(Address(regT0, JSArrowFunction::offsetOfThisValue()), regT0);
>+    emitStoreCell(dst, regT0);
>+}
> 
> void JIT::emit_op_to_this(Instruction* currentInstruction)
> {
>@@ -976,26 +985,43 @@ 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/JITOpcodes32_64.cpp b/Source/JavaScriptCore/jit/JITOpcodes32_64.cpp
>index 932657fcdf0201c3b265337bc7275f8de92b23c0..2b5384360936ffd672afcbd71d0d4aab03802cdf 100644
>--- a/Source/JavaScriptCore/jit/JITOpcodes32_64.cpp
>+++ b/Source/JavaScriptCore/jit/JITOpcodes32_64.cpp
>@@ -35,6 +35,7 @@
> #include "Exception.h"
> #include "JITInlines.h"
> #include "JSArray.h"
>+#include "JSArrowFunction.h"
> #include "JSCell.h"
> #include "JSEnvironmentRecord.h"
> #include "JSFunction.h"
>@@ -937,6 +938,14 @@ void JIT::emit_op_get_scope(Instruction* currentInstruction)
>     emitStoreCell(dst, regT0);
> }
> 
>+void JIT::emit_op_load_arrowfunction_this(Instruction* currentInstruction)
>+{
>+    int dst = currentInstruction[1].u.operand;
>+    emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
>+    loadPtr(Address(regT0, JSArrowFunction::offsetOfThisValue()), regT0);
>+    emitStoreCell(dst, regT0);
>+}
>+
> void JIT::emit_op_create_this(Instruction* currentInstruction)
> {
>     int callee = currentInstruction[2].u.operand;
>diff --git a/Source/JavaScriptCore/jit/JITOperations.cpp b/Source/JavaScriptCore/jit/JITOperations.cpp
>index e84e9342971cbd51ffb695729e8fe922b64c0d29..314c469a47933d5f5da08e2aab5fe92ce84ae75d 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"
>@@ -783,7 +784,7 @@ inline char* linkFor(
>     else {
>         FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
> 
>-        if (!isCall(kind) && functionExecutable->isBuiltinFunction()) {
>+        if (!isCall(kind) && (functionExecutable->isBuiltinFunction() || functionExecutable->isArrowFunction())) {
>             exec->vm().throwException(exec, createNotAConstructorError(exec, callee));
>             return reinterpret_cast<char*>(vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress());
>         }
>@@ -847,8 +848,7 @@ inline char* virtualForWithFunction(
>     ExecutableBase* executable = function->executable();
>     if (UNLIKELY(!executable->hasJITCodeFor(kind))) {
>         FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
>-
>-        if (!isCall(kind) && functionExecutable->isBuiltinFunction()) {
>+        if (!isCall(kind) && (functionExecutable->isBuiltinFunction() || functionExecutable->isArrowFunction())) {
>             exec->vm().throwException(exec, createNotAConstructorError(exec, function));
>             return reinterpret_cast<char*>(vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress());
>         }
>@@ -1020,6 +1020,30 @@ 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()));
>+    FunctionExecutable* executable = static_cast<FunctionExecutable*>(functionExecutable);
>+    VM& vm = exec->vm();
>+    NativeCallFrameTracer tracer(&vm, exec);
>+        
>+    JSArrowFunction* arrowFunction  = isInvalidated
>+        ? JSArrowFunction::createWithInvalidatedReallocationWatchpoint(vm, executable, scope, JSValue::decode(thisValue))
>+        : JSArrowFunction::create(vm, executable, scope, 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 64df4f39110afce7edc7ec35c040c8dd2c32c4a7..5e2ce7ce0a4bf13b621e9eecdadc214edc5edce2 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*);
>@@ -292,6 +293,9 @@ 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/jsc.cpp b/Source/JavaScriptCore/jsc.cpp
>index 57af6ae93a7f06d7d3d21307a298c0e9191f13d9..fef33f414b0eb65f777b087189f071f44a36c896 100644
>--- a/Source/JavaScriptCore/jsc.cpp
>+++ b/Source/JavaScriptCore/jsc.cpp
>@@ -37,6 +37,7 @@
> #include "Interpreter.h"
> #include "JSArray.h"
> #include "JSArrayBuffer.h"
>+#include "JSArrowFunction.h"
> #include "JSCInlines.h"
> #include "JSFunction.h"
> #include "JSLock.h"
>@@ -1166,7 +1167,7 @@ EncodedJSValue JSC_HOST_CALL functionHasBasicBlockExecuted(ExecState* exec)
>     JSValue functionValue = exec->argument(0);
>     RELEASE_ASSERT(functionValue.isFunction());
>     FunctionExecutable* executable = (jsDynamicCast<JSFunction*>(functionValue.asCell()->getObject()))->jsExecutable();
>-
>+    
>     RELEASE_ASSERT(exec->argument(1).isString());
>     String substring = exec->argument(1).getString(exec);
>     String sourceCodeText = executable->source().toString();
>diff --git a/Source/JavaScriptCore/llint/LLIntOffsetsExtractor.cpp b/Source/JavaScriptCore/llint/LLIntOffsetsExtractor.cpp
>index 5e16174405a8316d7b0181b8a115b035633ceb92..8ec9d34d7e10c36b9da22735aac0752928948a52 100644
>--- a/Source/JavaScriptCore/llint/LLIntOffsetsExtractor.cpp
>+++ b/Source/JavaScriptCore/llint/LLIntOffsetsExtractor.cpp
>@@ -36,6 +36,7 @@
> #include "Interpreter.h"
> #include "JITStubs.h"
> #include "JSArray.h"
>+#include "JSArrowFunction.h"
> #include "JSCell.h"
> #include "JSFunction.h"
> #include "VM.h"
>diff --git a/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp b/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>index 1934e570438e3cbec9a48a16f730d453eefb65b4..b9c3698fbe60e57afc4c8de8f4514aabb4cb8a13 100644
>--- a/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>+++ b/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp
>@@ -39,6 +39,8 @@
> #include "Interpreter.h"
> #include "JIT.h"
> #include "JITExceptions.h"
>+#include "JSArrowFunction.h"
>+#include "JSBoundFunction.h"
> #include "JSLexicalEnvironment.h"
> #include "JSCInlines.h"
> #include "JSCJSValue.h"
>@@ -171,7 +173,9 @@ 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();
>@@ -1010,15 +1014,32 @@ LLINT_SLOW_PATH_DECL(slow_path_new_func)
>     LLINT_RETURN(JSFunction::create(vm, codeBlock->functionDecl(pc[3].u.operand), scope));
> }
> 
>+inline JSFunction* getJSFunctionExpr(ExecState* exec, Instruction* pc, VM& vm)
>+{
>+    CodeBlock* codeBlock = exec->codeBlock();
>+    JSScope* scope = exec->uncheckedR(pc[2].u.operand).Register::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();
>+
>+    JSValue thisValue = LLINT_OP_C(4).jsValue();
>     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);
>     
>-    LLINT_RETURN(func);
>+    LLINT_RETURN(JSArrowFunction::create(vm, executable, scope, thisValue));
> }
> 
> static SlowPathReturnType handleHostCall(ExecState* execCallee, Instruction* pc, JSValue callee, CodeSpecializationKind kind)
>@@ -1096,7 +1117,7 @@ inline SlowPathReturnType setUpCall(ExecState* execCallee, Instruction* pc, Code
>     JSScope* scope = callee->scopeUnchecked();
>     VM& vm = *scope->vm();
>     ExecutableBase* executable = callee->executable();
>-    
>+
>     MacroAssemblerCodePtr codePtr;
>     CodeBlock* codeBlock = 0;
>     if (executable->isHostFunction())
>@@ -1104,7 +1125,7 @@ inline SlowPathReturnType setUpCall(ExecState* execCallee, Instruction* pc, Code
>     else {
>         FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
> 
>-        if (!isCall(kind) && functionExecutable->isBuiltinFunction())
>+        if (!isCall(kind) && (functionExecutable->isBuiltinFunction() || functionExecutable->isArrowFunction()))
>             LLINT_CALL_THROW(exec, createNotAConstructorError(exec, callee));
> 
>         JSObject* error = functionExecutable->prepareForExecution(execCallee, callee, scope, kind);
>diff --git a/Source/JavaScriptCore/llint/LLIntSlowPaths.h b/Source/JavaScriptCore/llint/LLIntSlowPaths.h
>index 7b2b75366ccb7a796790847c664f2ef1726ab013..608202db53fc7700d11cb7788b542a841d14eb7c 100644
>--- a/Source/JavaScriptCore/llint/LLIntSlowPaths.h
>+++ b/Source/JavaScriptCore/llint/LLIntSlowPaths.h
>@@ -97,6 +97,7 @@ 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 52785b25b4c6f1f47055a2732aa45ece8cc17cee..a5b59fed73c71158e6bc45112383ea4267df07ac 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/llint/LowLevelInterpreter32_64.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
>index b66a99d4e49fd85a2481ee9cbe85c42bb751448b..d5d65a1e519a8211d0557f8847744435b2093575 100644
>--- a/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
>+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
>@@ -2371,3 +2371,12 @@ _llint_op_profile_type:
> 
> .opProfileTypeDone:
>     dispatch(6)
>+
>+_llint_op_load_arrowfunction_this:
>+    traceExecution()
>+    loadi Callee + PayloadOffset[cfr], t0
>+    loadi JSArrowFunction::m_boundThis[t0], t0
>+    loadisFromInstruction(1, t1)
>+    storei CellTag, TagOffset[cfr, t1, 8]
>+    storei t0, PayloadOffset[cfr, t1, 8]
>+    dispatch(2)
>\ No newline at end of file
>diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
>index f5af818f9147e80eb0599f4d26c0997b68fa86db..cafbf345ab0be38aa0db5a24c43cc4fcffb5049c 100644
>--- a/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
>+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
>@@ -2225,3 +2225,11 @@ _llint_op_profile_type:
> 
> .opProfileTypeDone:
>     dispatch(6)
>+
>+_llint_op_load_arrowfunction_this:
>+    traceExecution()
>+    loadp Callee[cfr], t0
>+    loadp JSArrowFunction::m_boundThis[t0], t0
>+    loadisFromInstruction(1, t1)
>+    storeq t0, [cfr, t1, 8]
>+    dispatch(2)
>\ No newline at end of file
>diff --git a/Source/JavaScriptCore/parser/ASTBuilder.h b/Source/JavaScriptCore/parser/ASTBuilder.h
>index b0c99784547dbeeacc0e6a2aa69a42788983fd88..8c90bddc73b47ba5999ed441e365e635f8710243 100644
>--- a/Source/JavaScriptCore/parser/ASTBuilder.h
>+++ b/Source/JavaScriptCore/parser/ASTBuilder.h
>@@ -364,8 +364,7 @@ public:
>     ExpressionNode* createArrowFunctionExpr(const JSTokenLocation& location, const ParserFunctionInfo<ASTBuilder>& functionInfo)
>     {
>         SourceCode source = m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.endOffset, functionInfo.startLine, functionInfo.bodyStartColumn);
>-
>-        FuncExprNode* result = new (m_parserArena) FuncExprNode(location, *functionInfo.name, functionInfo.body, source);
>+        ArrowFuncExprNode* result = new (m_parserArena) ArrowFuncExprNode(location, *functionInfo.name, functionInfo.body, source);
>         functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);
>         return result;
>     }
>diff --git a/Source/JavaScriptCore/parser/NodeConstructors.h b/Source/JavaScriptCore/parser/NodeConstructors.h
>index 1167e82ebe83f4fa648b7493f9f435ed5db7e4c6..3c5db20fadec62492acaf4b3433e82a06a238412 100644
>--- a/Source/JavaScriptCore/parser/NodeConstructors.h
>+++ b/Source/JavaScriptCore/parser/NodeConstructors.h
>@@ -840,6 +840,13 @@ namespace JSC {
>         m_body->finishParsing(source, ident, FunctionDeclaration);
>     }
> 
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
>+    inline ArrowFuncExprNode::ArrowFuncExprNode(const JSTokenLocation& location, const Identifier& ident, FunctionBodyNode* body, const SourceCode& source)
>+        : FuncExprNode(location, ident, body, source)
>+    {
>+    }
>+#endif
>+
> #if ENABLE(ES6_CLASS_SYNTAX)
>     inline ClassDeclNode::ClassDeclNode(const JSTokenLocation& location, ExpressionNode* classDeclaration)
>         : StatementNode(location)
>diff --git a/Source/JavaScriptCore/parser/Nodes.h b/Source/JavaScriptCore/parser/Nodes.h
>index 7265c8cf114e15ebdceff25108ce738abd5826bd..35eea64a490a56f2d863db18931d57ac093c922a 100644
>--- a/Source/JavaScriptCore/parser/Nodes.h
>+++ b/Source/JavaScriptCore/parser/Nodes.h
>@@ -164,6 +164,9 @@ 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; }
>@@ -1720,6 +1723,19 @@ namespace JSC {
>         FunctionBodyNode* m_body;
>     };
> 
>+#if ENABLE(ES6_ARROWFUNCTION_SYNTAX)
>+    class ArrowFuncExprNode : public FuncExprNode {
>+    public:
>+        ArrowFuncExprNode(const JSTokenLocation&, const Identifier&, FunctionBodyNode*, const SourceCode&);
>+    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/Executable.cpp b/Source/JavaScriptCore/runtime/Executable.cpp
>index e117ab6e31078be17cb2078055aa8427494ba3e1..4d1b5908e54394bcde93eeb4dc965dcc164dac20 100644
>--- a/Source/JavaScriptCore/runtime/Executable.cpp
>+++ b/Source/JavaScriptCore/runtime/Executable.cpp
>@@ -237,8 +237,7 @@ RefPtr<CodeBlock> ScriptExecutable::newCodeBlockFor(
>     DebuggerMode debuggerMode = globalObject->hasDebugger() ? DebuggerOn : DebuggerOff;
>     ProfilerMode profilerMode = globalObject->hasProfiler() ? ProfilerOn : ProfilerOff;
>     UnlinkedFunctionCodeBlock* unlinkedCodeBlock =
>-        executable->m_unlinkedExecutable->codeBlockFor(
>-            *vm, executable->m_source, kind, debuggerMode, profilerMode, error);
>+    executable->m_unlinkedExecutable->codeBlockFor(*vm, executable->m_source, kind, debuggerMode, profilerMode, error, executable->isArrowFunction());
>     recordParse(executable->m_unlinkedExecutable->features(), executable->m_unlinkedExecutable->hasCapturedVariables(), firstLine(), lastLine(), startColumn(), endColumn()); 
>     if (!unlinkedCodeBlock) {
>         exception = vm->throwException(
>diff --git a/Source/JavaScriptCore/runtime/Executable.h b/Source/JavaScriptCore/runtime/Executable.h
>index 4a0db566b32cca2c120ceb6496a495242f2ea90f..1c92b1d31703296f21776a7ff9001b3bf751a1c6 100644
>--- a/Source/JavaScriptCore/runtime/Executable.h
>+++ b/Source/JavaScriptCore/runtime/Executable.h
>@@ -472,7 +472,7 @@ public:
> 
>     void clearCode();
> 
>-    ExecutableInfo executableInfo() const { return ExecutableInfo(needsActivation(), usesEval(), isStrictMode(), false, false, ConstructorKind::None); }
>+    ExecutableInfo executableInfo() const { return ExecutableInfo(needsActivation(), usesEval(), isStrictMode(), false, false, ConstructorKind::None, false); }
> 
>     unsigned numVariables() { return m_unlinkedEvalCodeBlock->numVariables(); }
>     unsigned numberOfFunctionDecls() { return m_unlinkedEvalCodeBlock->numberOfFunctionDecls(); }
>@@ -528,7 +528,7 @@ public:
> 
>     void clearCode();
> 
>-    ExecutableInfo executableInfo() const { return ExecutableInfo(needsActivation(), usesEval(), isStrictMode(), false, false, ConstructorKind::None); }
>+    ExecutableInfo executableInfo() const { return ExecutableInfo(needsActivation(), usesEval(), isStrictMode(), false, false, ConstructorKind::None, false); }
> 
> private:
>     friend class ScriptExecutable;
>@@ -630,6 +630,7 @@ public:
>         
>     FunctionMode functionMode() { return m_unlinkedExecutable->functionMode(); }
>     bool isBuiltinFunction() const { return m_unlinkedExecutable->isBuiltinFunction(); }
>+    bool isArrowFunction() const { return m_unlinkedExecutable->isArrowFunction(); }
>     bool isClassConstructorFunction() const { return m_unlinkedExecutable->isClassConstructorFunction(); }
>     const Identifier& name() { return m_unlinkedExecutable->name(); }
>     const Identifier& inferredName() { return m_unlinkedExecutable->inferredName(); }
>diff --git a/Source/JavaScriptCore/runtime/JSArrowFunction.cpp b/Source/JavaScriptCore/runtime/JSArrowFunction.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..51116b1a7bc4ee47761f6d29819ad554610fdc9e
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/JSArrowFunction.cpp
>@@ -0,0 +1,86 @@
>+/*
>+ * 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) };
>+
>+void JSArrowFunction::destroy(JSCell* cell)
>+{
>+    static_cast<JSArrowFunction*>(cell)->JSArrowFunction::~JSArrowFunction();
>+}
>+
>+JSArrowFunction* JSArrowFunction::create(VM& vm, FunctionExecutable* executable, JSScope* scope, JSValue boundThis)
>+{
>+    JSArrowFunction* result = createImpl(vm, executable, scope, boundThis);
>+    executable->singletonFunction()->notifyWrite(vm, result, "Allocating a arrow function");
>+    return result;
>+}
>+
>+JSArrowFunction::JSArrowFunction(VM& vm, FunctionExecutable* executable, JSScope* scope, JSValue boundThis)
>+    : Base(vm, executable, scope, scope->globalObject()->arrowFunctionStructure())
>+    , m_boundThis(vm, this, boundThis)
>+{
>+}
>+
>+JSArrowFunction* JSArrowFunction::createWithInvalidatedReallocationWatchpoint(VM& vm, FunctionExecutable* executable, JSScope* scope, JSValue boundThis)
>+{
>+    ASSERT(executable->singletonFunction()->hasBeenInvalidated());
>+    return create(vm, executable, scope, boundThis);
>+}
>+
>+void JSArrowFunction::finishCreation(VM& vm)
>+{
>+    Base::finishCreation(vm);
>+    putDirect(vm, vm.propertyNames->prototype, jsUndefined(), 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_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..90808285562d5bea55d33de7aa0eef715d3b94dd
>--- /dev/null
>+++ b/Source/JavaScriptCore/runtime/JSArrowFunction.h
>@@ -0,0 +1,101 @@
>+/*
>+ * 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 {
>+    
>+class JSGlobalObject;
>+class LLIntOffsetsExtractor;
>+class LLIntDesiredOffsets;
>+    
>+class JSArrowFunction : public JSFunction {
>+    friend class JIT;
>+#if ENABLE(DFG_JIT)
>+    friend class DFG::SpeculativeJIT;
>+    friend class DFG::JITCompiler;
>+#endif
>+    friend class VM;
>+public:
>+    typedef JSFunction Base;
>+
>+    static JSArrowFunction* create(VM&, FunctionExecutable*, JSScope*, JSValue);
>+    static JSArrowFunction* createWithInvalidatedReallocationWatchpoint(VM&, FunctionExecutable*, JSScope*, JSValue);
>+
>+    static void destroy(JSCell*);
>+    
>+    static size_t allocationSize(size_t inlineCapacity)
>+    {
>+        ASSERT_UNUSED(inlineCapacity, !inlineCapacity);
>+        return sizeof(JSArrowFunction);
>+    }
>+    
>+    static JSArrowFunction* createImpl(VM& vm, FunctionExecutable* executable, JSScope* scope, JSValue boundThis)
>+    {
>+        JSArrowFunction* function = new (NotNull, allocateCell<JSArrowFunction>(vm.heap)) JSArrowFunction(vm, executable, scope, boundThis);
>+        ASSERT(function->structure()->globalObject());
>+        function->finishCreation(vm);
>+        return function;
>+    }
>+    
>+    static ConstructType getConstructData(JSCell*, ConstructData&);
>+
>+    JSValue boundThis() { return m_boundThis.get(); }
>+    
>+    DECLARE_EXPORT_INFO;
>+    
>+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
>+    {
>+        ASSERT(globalObject);
>+        return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), 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&, FunctionExecutable*, JSScope*, JSValue);
>+
>+    void finishCreation(VM&);
>+    
>+friend class LLIntOffsetsExtractor;
>+    
>+    WriteBarrier<Unknown> m_boundThis;
>+};
>+    
>+} // namespace JSC
>+
>+#endif // JSArrowFunction_h
>diff --git a/Source/JavaScriptCore/runtime/JSFunction.h b/Source/JavaScriptCore/runtime/JSFunction.h
>index 0b87d75c91450c5af1aaed27a61a748ef80f093e..928350e2478c45f7bf7e8aa84c9ec3a4e252a86e 100644
>--- a/Source/JavaScriptCore/runtime/JSFunction.h
>+++ b/Source/JavaScriptCore/runtime/JSFunction.h
>@@ -141,6 +141,7 @@ public:
> protected:
>     JS_EXPORT_PRIVATE JSFunction(VM&, JSGlobalObject*, Structure*);
>     JSFunction(VM&, FunctionExecutable*, JSScope*);
>+    JSFunction(VM&, FunctionExecutable*, JSScope*, Structure*);
> 
>     void finishCreation(VM&, NativeExecutable*, int length, const String& name);
>     using Base::finishCreation;
>diff --git a/Source/JavaScriptCore/runtime/JSFunctionInlines.h b/Source/JavaScriptCore/runtime/JSFunctionInlines.h
>index f6c6d58ec6e5c1164cb27fa5e41618b4b8142f02..f059584cf07d7fd69ea2dcfe27b63b644a884413 100644
>--- a/Source/JavaScriptCore/runtime/JSFunctionInlines.h
>+++ b/Source/JavaScriptCore/runtime/JSFunctionInlines.h
>@@ -44,6 +44,13 @@ inline JSFunction::JSFunction(VM& vm, FunctionExecutable* executable, JSScope* s
>     , m_rareData()
> {
> }
>+    
>+inline JSFunction::JSFunction(VM& vm, FunctionExecutable* executable, JSScope* scope, Structure* structure)
>+    : Base(vm, scope, structure)
>+    , m_executable(vm, this, executable)
>+    , m_rareData()
>+{
>+}
> 
> inline FunctionExecutable* JSFunction::jsExecutable() const
> {
>diff --git a/Source/JavaScriptCore/runtime/JSGlobalObject.cpp b/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
>index 419c1b27799428b6f6af59582219df9b3f15183f..3e905a362144276c04f5fdb4d9f75d38a0d013ca 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()));
>@@ -821,6 +823,7 @@ 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 337bb746a32ae035602e77cc7d219648da8f3c0d..3762c404f4e95ab4113dd5ffcd21ebeeab63a372 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;
>@@ -481,6 +482,7 @@ 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..2782a53f3c8e18dadd466c62d0370390e2a7ad61
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-2.js
>@@ -0,0 +1,39 @@
>+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};
>+noInline(real.borrow);
>+
>+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..1019086d58479c4bd4fe0f527b3a7bb8939c092d
>--- /dev/null
>+++ b/Source/JavaScriptCore/tests/stress/arrowfunction-lexical-this-3.js
>@@ -0,0 +1,28 @@
>+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");
>+}
>+
>+for (var i=0; i<10000; i++) {
>+  var result1 = obj.method()('test' + i.toString());
>+  testCase(result1, '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");
>+}
>+
>+for (var i=0; i<10000; i++) {
>+  var result2 = obj.method()('test' + i.toString());
>+  testCase(result2, '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 2f10edd5226e9c1121fbea05762e08f55951dfc9..af7e1036b162346d0c0b0d0ecbebe1adf04bf274 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,40 @@
>+2015-07-23  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-lexical-this-3-expected.txt: Added.
>+        * js/arrowfunction-lexical-this-3.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-lexical-this-3.js: Added.
>+        * js/script-tests/arrowfunction-others.js: Added.
>+        * js/script-tests/arrowfunction-tdz.js: Added.
>+        * js/script-tests/arrowfunction-typeof.js: Added.
>+
> 2015-07-20  Andreas Kling  <akling@apple.com>
> 
>         Improve behavior of media elements in page cache.
>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-lexical-this-3-expected.txt b/LayoutTests/js/arrowfunction-lexical-this-3-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..2685998ded492a88ae7d7c100d65f669848647be
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-lexical-this-3-expected.txt
>@@ -0,0 +1,11 @@
>+Tests for ES6 arrow function lexical bind of this
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS f('-this') is "right-this"
>+PASS obj.func('-this') is "right-this"
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/js/arrowfunction-lexical-this-3.html b/LayoutTests/js/arrowfunction-lexical-this-3.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..6d2fe183472313b2d9e663cac253243b49bf9de5
>--- /dev/null
>+++ b/LayoutTests/js/arrowfunction-lexical-this-3.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-3.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..6a997c9bef014c1fcafd9ddc4cb3bf0f49b4b74a
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-lexical-this-2.js
>@@ -0,0 +1,21 @@
>+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-lexical-this-3.js b/LayoutTests/js/script-tests/arrowfunction-lexical-this-3.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..65ab2c1c584f8e0ff5fb7c7d1d44831b1f37d0c7
>--- /dev/null
>+++ b/LayoutTests/js/script-tests/arrowfunction-lexical-this-3.js
>@@ -0,0 +1,9 @@
>+description('Tests for ES6 arrow function lexical bind of this');
>+
>+var f = { x : "right", func : function() { return z => this.x + z; }}.func();
>+var obj = { x : "wrong", func : f };
>+
>+shouldBe("f('-this')", '"right-this"');
>+shouldBe("obj.func('-this')", '"right-this"');
>+
>+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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