[Webkit-unassigned] [Bug 153981] [ES6] Arrow function syntax. Emit loading&putting this/super only if they are used in arrow function

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Feb 26 13:08:34 PST 2016


https://bugs.webkit.org/show_bug.cgi?id=153981

--- Comment #38 from GSkachkov <gskachkov at gmail.com> ---
(In reply to comment #36)
> Comment on attachment 272326 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=272326&action=review
> 
> > Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp:575
> > +    if (SourceParseMode::ArrowFunctionMode == parseMode && (functionNode->usesThis() || isThisUsedInInnerArrowFunction()))
> 
> Is this change here correct?
> Does it work for:
> class A { getValue() { ... } }
> class B extends A { constructor() { arr = ()=>super.getValue(); arr();
> super(); }}

It should work, we emit TDZ always when access to the super. 
https://trac.webkit.org/browser/trunk/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp#L922

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