639598 - Consider caching the return value of mozResponseArrayBuffer

Status: RESOLVED DUPLICATE of bug 658683

(Core :: DOM: Core & HTML, defect)

Description

[Boris Zbarsky [:bzbarsky]]

It's a matter of time before someone writes silly code that gets this property over and over...

For .responseText we use a shareable string buffer, so once we compute it once every get is just an addref.

For .mozResponseArrayBuffer, could we cache the actual JSObject?  If not, could we cache the backing store?

Note that we have to be careful here because unlike strings typed arrays are _mutable_.  So if we did cache we'd need to somehow invalidate the cache on writes from JS too... or something.

Maybe this isn't very doable.

Comment 1

[Masatoshi Kimura [:emk]]

.mozResponseArrayBuffer has been changed to .response with .responseType="arraybuffer", and property value caching has been implemented in bug 658683.