[Webkit-unassigned] [Bug 99674] New: Web Inspector: [JSC] SourceProvider reuses IDs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=99674

           Summary: Web Inspector: [JSC] SourceProvider reuses IDs
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: timothy at apple.com
                CC: ggaren at apple.com, oliver at apple.com, keishi at webkit.org,
                    pmuellr at yahoo.com, pfeldman at chromium.org,
                    yurys at chromium.org, apavlov at chromium.org,
                    loislo at chromium.org, vsevik at chromium.org,
                    webkit-bug-importer at group.apple.com, fpizlo at apple.com,
                    web-inspector-bugs at googlegroups.com


JSC::SourceProvider provides an ID to identify scripts. This ID is simply this cast to an intptr_t. If SourceProvider is freed another one can be allocated in the same location and cause the same ID to be reported to the Debugger.

I am able to get the same SourceProvider ID on apple.com by reloading a few times. The IDs a reused during the same page load, so it can really confuse the Inspector given that we use these IDs to identify scripts (especially scripts without URLs.)

Either someone needs to retain the SourceProvider (maybe ScriptDebugListener::Script?) so the ID can't be reused or SourceProvider needs a new thread safe unique ID assigned when SourceProvider is created.

<rdar://problem/12517297>

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