1610206 - Restrict functions returned by Function#caller

Status: RESOLVED FIXED

(Core :: JavaScript Engine, task, P2)

Description

[Tom S]

There is a TC39 proposal for specifying Function#caller. This proposal restricts the functions that can be returned. Currently we already throw for strict functions. The proposal changes this to returning null for strict, async or generator functions. Furthermore cross-realm functions are also disallowed. I suggest we implement that change in a separate bug, because this restriction is currently not enforced by any browser.

Comment 1

[Tom S]

Attachment: Bug 1610206 - Restrict functions returned by Function#caller. r?jorendorff

Comment 2

[Tom S]

I just realized this proposal is at stage 0. So I think we should wait at least till the first presentation of this proposal at the next meeting.

Comment 3

[Florian Scholz (Open Web Docs)]

See also https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/caller

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/d0226991e792
Restrict functions returned by Function#caller. r=jorendorff

Comment 5

[Cristina Coroiu [:ccoroiu]]

https://hg.mozilla.org/mozilla-central/rev/d0226991e792

Comment 6

[Kohei Yoshino]

Posted site compatibility note for web developers.

Comment 8

[Florian Scholz (Open Web Docs)]

Release notes: https://wiki.developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/75#JavaScript
Reference docs: https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/caller