[Webkit-unassigned] [Bug 135305] New: CodeCache should not cache when the WebInspector is open

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135305

           Summary: CodeCache should not cache when the WebInspector is
                    open
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sbarati at apple.com
                CC: fpizlo at apple.com


The WebInspector often uses source code IDs to identify unique scripts. If CodeCache is turned on, it may determine two scripts are the same because their text contents are the same, when indeed the two scripts come from discreet websites, and when the cache returns a CodeBlock, it doesn't change it's originating source ID. This has an especially perverse effect when high fidelity type profiling is enabled because the type profiler uses source code IDs in JavaScriptCore to correlate the unique identity of scripts with the WebInspector. This also has another perverse effect that when type profiling is enabled then disabled: JavaScriptCore recompiles all scripts because type profiling is only enabled in the LLInt. If type profiling is enabled then disabled, and the CodeCache successfully caches a script that had this profiling enabled, but type profiling is currently disabled, it will try to tier up a CodeBlock to the baseline JIT that contains the opcodes for type profiling, and this 

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