Could you show a sample patch that uses this? On Mon, Apr 25, 2016 at 10:19 AM, Nick Fitzgerald <nfitzger...@mozilla.com> wrote:
> Hi everyone! > > Friendly PSA: sometimes you're debugging a "leak" where the GC considers > something reachable and therefore won't collect it, and this happens at an > inopportune time for using the devtools memory panel (eg right before a > DESTROY_RUNTIME collection), so you can't use the nice GUI for visualizing > the GC's retaining paths. > > Fear not! You can use `JS::ubi::dumpPaths` to log retaining paths of any GC > thing from within GDB, or you can compile it in as you might do with a > tactically placed printf. > > The signature is `void JS::ubi::dumpPaths(JSRuntime* rt, JS::ubi::Node > node, maxRetainingPaths = 10)`. The `rt` should be the runtime that the > thing belongs to, `node` is the thing (JS::ubi::Node constructs from raw GC > pointers as well as Rooted and Handle), and `maxRetainingPaths` is the > number of retaining paths to dump. > > Include the "js/UbiNodeShortestPaths.h" header to get `JS::ubi::dumpPaths`. > > Happy bug hunting! > > Example output: > > Path 0: > 0x7fff5fbfec10 JS::ubi::RootList > | > | > '<no edge name>' > | > V > 0x115c49d80 JSObject > | > | > 'shape' > | > V > 0x12ac4db50 js::Shape > | > | > 'base' > | > V > 0x116244e70 js::BaseShape > | > | > 'ShapeTable shape' > | > V > 0x116289120 js::Shape > | > | > 'getter' > | > V > 0x11627b3a0 JSObject > | > | > 'private' > | > V > 0x11855d940 JSObject > | > | > 'script' > | > V > 0x113290bf0 JSScript > | > | > 'sourceObject' > | > V > 0x1132763c0 JSObject > > Full output: https://pastebin.mozilla.org/8868795 > _______________________________________________ > dev-developer-tools mailing list > dev-developer-to...@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-developer-tools > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
