[Webkit-unassigned] [Bug 25745] New: JSC exposes unused offsets and sourceId on every exception

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=25745

           Summary: JSC exposes unused offsets and sourceId on every
                    exception
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: eric at webkit.org
                CC: mjs at apple.com, ggaren at apple.com, jparent at google.com,
                    ojan at chromium.org, arv at chromium.org


JSC exposes unused offsets and sourceId on every exception


Currently JSC exposes the following "non-standard" properties on every
exception:

sourceId
expressionBeginOffset
expressionCaretOffset
expressionEndOffset

Talking to oliver, they were original intended for the Inspector, but they
aren't used there.  These could be really useful, but they aren't quite.

sourceId is only useful for the inspector, since random web pages have no way
to get the actual script source from a sourceId handle.

expression*Offset would be *really* useful to web pages (for printing where in
the line the actual erroring expression is) except that they're relative to the
start of the sourceId source, instead of the start of the sourceURL resource.

This bug is asking for 2 things:
1.  remove these unused properties from exception (since we shouldn't really be
exposing them).
2.  Add some *offset properties which are either relative to the line or
relative to the source document (both of which a web page could use to figure
out where exactly the error is ocurring).


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