[Webkit-unassigned] [Bug 149654] New: Allow an object's marking state to track The Three Colors

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Sep 29 20:43:27 PDT 2015


https://bugs.webkit.org/show_bug.cgi?id=149654

            Bug ID: 149654
           Summary: Allow an object's marking state to track The Three
                    Colors
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Currently, each object not only knows if it's marked in this GC, but also whether it's a survivor of a prior GC and whether it's in a remembered set.  When we add concurrent GC, we'll also want to differentiate between being on the GC worklist (i.e. "grey") and having already been marked (i.e. "black").  But we also want to know if an object is grey the first time (and so should be allowed to trigger copying) or a subsequent time (and so should not trigger copying).

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