630370 - self-host Object.watch()

Status: RESOLVED DUPLICATE of bug 638054

(Core :: JavaScript Engine, defect)

Description

[Andreas Gal :gal]

watchpoints incur some nasty complexity in our code base and are non-standard. We might be able to self-host a mechanism that offers almost the same features but doesn't require any specialized runtime support in the VM.

Comment 1

[Luke Wagner [:luke]]

\o/

Comment 2

[Andreas Gal :gal]

Attachment: watch implementations in JS

This is not as powerful as the native watch and has a bunch of corner cases (most notably it is not persistent across property deletions), but maybe its enough to deprecate the real watch code?

Comment 3

[Jesse Ruderman]

See also bug 638054 for removing Object.prototype.watch.

Comment 4

[Till Schneidereit [:till]]

With the infrastructure tracked by bug 784288, we could implement this in a safe way.

Comment 5

[David Bruant]

Object.watch is on its way to being removed in favor of a debugger-only alternative (bug 638054), so it might not be worth investing a lot of effort on this bug unless the fate of Object.watch changes.

Comment 6

[André Bargull [:anba]]

watch() was removed in bug 638054.