[Webkit-unassigned] [Bug 138726] New: Web Inspector: Provide $e in the console for the thrown exception value

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138726

            Bug ID: 138726
           Summary: Web Inspector: Provide $e in the console for the
                    thrown exception value
    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: joepeck at webkit.org
                CC: burg at cs.washington.edu, graouts at webkit.org,
                    joepeck at webkit.org, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

* SUMMARY
When pausing on exceptions it can be difficult or impossible to interact with the actual thrown exception object. For example breaking on an uncaught exception, there is no named reference to the thrown value that would otherwise have been available in "catch (e)". We can provide a named reference in the console, such as "$e".

* TEST

    <button id="x">Click Me</button>
    <script>
    var times = 0;
    document.getElementById('x').addEventListener('click', function() {
        times++;
        if (times === 1)
            [].x.x;
        if (times === 2)
            throw "string error";
        if (times === 3)
            throw null;
        if (times === 4)
            throw document;
    });
    </script>

* STEPS TO REPRODUCE
1. Inspect test page
2. Enable break on all exceptions
3. Click the button on the page to trigger exceptions
  => should be able to get the different thrown values (Errors / objects) via "$e" in the console.

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