1963431 - Add JS_StringifyWithLengthHint

Status: RESOLVED FIXED

(Core :: JavaScript Engine, task, P1)

Description

[Iain Ireland [:iain]]

To save tab state, we periodically serialize a state object in the parent process (using JSON.stringify) to send it to another thread, where it is written to disk. For particularly large states, stringifying the state object takes a long time, and much of that time is spent reallocating the vector underlying the StringBuilder.

There are lots of things that can be changed here (and probably should), but a quick and dirty way to speed things up is to allow the code calling JS_Stringify to pass a length hint, and use it to preallocate a buffer of the right size.

Comment 1

[Iain Ireland [:iain]]

Attachment: Bug 1963431: Add JS_StringifyWithLengthHint r=tcampbell

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/63538dac54ab
Add JS_StringifyWithLengthHint r=tcampbell

Comment 3

[pstanciu]

https://hg.mozilla.org/mozilla-central/rev/63538dac54ab