[Webkit-unassigned] [Bug 144577] New: Web Inspector: JS syntax errors are awkward to debug when "Pause on Uncaught Exceptions" is enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144577

            Bug ID: 144577
           Summary: Web Inspector: JS syntax errors are awkward to debug
                    when "Pause on Uncaught Exceptions" is enabled
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: burg at cs.washington.edu
                CC: graouts at webkit.org, joepeck at webkit.org,
                    jonowells at apple.com, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

Suppose you have some Foo class that consists of invalid JS. When you try to instantiate a Foo instance, JSC will complain that Foo doesn't exist, because it was never defined due to the syntax erorr.

If you have Pause on Uncaught Exceptions enabled, what happens is that it will pause on the constructor callsite without showing the parse error in the sidebar. Only once you continue will the actual error show up in the sidebar. I'm not sure if it's stuck in a nested runloop or what the cause is, but it makes debugging a parse error hard.

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