483701 - TM: Remove _frags and all related fragment mapping code from Fragmento

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Comment 1

[Andreas Gal :gal]

The main tracer already uses a separate (ip, globalShape) => Fragment mapping. Fragmento's mapping is a binary search and is slow and not powerful enough. Only the regexp jit uses it at this point, and needs a separate fragmento (and code cache) due to that.

The attached patch does the following:
- gut fragmento, remove ip -> fragment mapping and lot of dead statistics code
- make regexp use its own regexp -> fragment mapping
- introduce js_InvalidateJITCache which will either immediately flush the JIT cache if possible (no native code is running, and no native code is on the stack), or it sets a flag to flush as soon as possible
- regexp now uses the main fragmento's code cache, but a separate lirbuf since we might compile regexps while recording a trace

Comment 2

[Andreas Gal :gal]

Attachment: patch

Comment 3

[Ryan VanderMeulen [:RyanVM]]

Obsolete with the removal of tracejit.