Thanks! What is the point of marking a map as stable? If there was a normalization isn't a new map created? So if types can't get mixed up after normalization, what is the point of marking a map as stable?
- Jann On Tuesday, December 31, 2019 at 1:33:36 AM UTC-6, Leszek Swirski wrote: > > Hi, > > A stable map is one from which a transition has never been observed, i.e. > it's the leaf of the transition tree and objects with that map can be > assumed to be "stable". Perhaps "is_leaf" or "never_transitioned_away_from" > could be alternative names but it's a subtle concept to name and naming is > hard anyway :) > > In the code you linked, I'm not 100% familiar with the reasoning but I > assume that the compiler assumes that inferred stable maps are a "safe bet" > as far as speculation is concerned, since they're a reliable end state, and > can be assumed to be a correct inference even if the data is unreliable. > That's mostly just a guess from the context though. > > - Leszek > > On Tue, 31 Dec 2019, 05:46 , <janngo...@gmail.com <javascript:>> wrote: > >> What is the difference between a stable and unstable map? >> >> Context: I'm trying to understand this line of code >> https://cs.chromium.org/chromium/src/v8/src/compiler/js-native-context-specialization.cc?l=3227&rcl=4c53f9a51444393133ff303952f1296603d44ab7 >> >> but can't seem to find any documentation about stable maps. Comments and >> diffs are sparse on the subject as well. >> >> -- >> -- >> v8-dev mailing list >> v8-...@googlegroups.com <javascript:> >> http://groups.google.com/group/v8-dev >> --- >> You received this message because you are subscribed to the Google Groups >> "v8-dev" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to v8-...@googlegroups.com <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/v8-dev/d8383180-787c-4bac-8ac3-d9295d400b2c%40googlegroups.com >> >> <https://groups.google.com/d/msgid/v8-dev/d8383180-787c-4bac-8ac3-d9295d400b2c%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- -- v8-dev mailing list v8-dev@googlegroups.com http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/b2064f2a-93ea-4354-ac53-150a8eb56f68%40googlegroups.com.
