Bug 152570 – [ES6] Arrow function. Arrow function should raise exception ReferenceError only when access to 'arguments' on top level

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[GSkachkov]

Arrow function should raise exception ReferenceError only when access to 'arguments' in strict mode in top level arrow function. 

'use strict';

var arr = (error) => {
    if (error) {
       return arguments; 
    } else {
       return [];
    } 
};

arr(false) === [];

arr(true); // ReferenceError

[GSkachkov]

It seems that it is not important is this strict mode or not, just arrow function on top level.

[GSkachkov]

Created attachment 271441 [details]
Patch

Added tests

[Saam Barati]

Comment on attachment 271441 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=271441&action=review

> LayoutTests/js/script-tests/arrowfunction-lexical-bind-arguments-top-level.js:2
> +// Ignore this test in run-jsc-stress-tests, but run in run-webkit-tests
> +//@ skip

Why?

[GSkachkov]

Comment on attachment 271441 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=271441&action=review

>> LayoutTests/js/script-tests/arrowfunction-lexical-bind-arguments-top-level.js:2
>> +//@ skip
> 
> Why?

jsc always has arguments http://trac.webkit.org/browser/trunk/Source/JavaScriptCore/jsc.cpp#L758 so I skip tests in jsc
But in browser we do not have arguments, so I'm checking only for browser.

[Saam Barati]

Comment on attachment 271441 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=271441&action=review

>>> LayoutTests/js/script-tests/arrowfunction-lexical-bind-arguments-top-level.js:2
>>> +//@ skip
>> 
>> Why?
> 
> jsc always has arguments http://trac.webkit.org/browser/trunk/Source/JavaScriptCore/jsc.cpp#L758 so I skip tests in jsc
> But in browser we do not have arguments, so I'm checking only for browser.

Ok. Can you add that to your comment in the test?

[GSkachkov]

Created attachment 271572 [details]
Patch

Fix comments

[GSkachkov]

(In reply to comment #5)
> Comment on attachment 271441 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=271441&action=review
> 
> >>> LayoutTests/js/script-tests/arrowfunction-lexical-bind-arguments-top-level.js:2
> >>> +//@ skip
> >> 
> >> Why?
> > 
> > jsc always has arguments http://trac.webkit.org/browser/trunk/Source/JavaScriptCore/jsc.cpp#L758 so I skip tests in jsc
> > But in browser we do not have arguments, so I'm checking only for browser.
> 
> Ok. Can you add that to your comment in the test?

Fixed

[WebKit Commit Bot]

Comment on attachment 271572 [details]
Patch

Clearing flags on attachment: 271572

Committed r196718: <http://trac.webkit.org/changeset/196718>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.