[Webkit-unassigned] [Bug 144011] New: Give the heap object iterators the ability to return early.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144011

            Bug ID: 144011
           Summary: Give the heap object iterators the ability to return
                    early.
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

JSDollarVMPrototype::isValidCell() uses a heap object iterator to validate candidate cell pointers, and, when in use, is called a lot more often than the normal way those iterators are used.  As a result, I see my instrumented VM killed with a SIGXCPU (CPU time limit exceeded).  This patch gives the callback functor the ability to tell the iterators to return early when the functor no longer needs to continue iterating.  With this, my instrumented VM is useful again for debugging.

Since heap iteration is not something that we do in a typical fast path, I don’t expect this to have any noticeable impact on performance.

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