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XPCShell currently overrides all the JSContexts whose creation it observes with its own custom error reporter. This reporter does all sorts of funny things which we try to clean up for the most part. But there are a few very intricate considerations at play. First, the old xpcshell error reporter does some mumbo jumbo with the XPCCallContext stack to try to guess whether some other code might catch the exception. This is total garbage on a number of fronts, particularly because the XPCCallContext stack has no concept of saved frame chains, nested event loops, sandbox boundaries, origin boundaries, or any of the myriad of complicating factors that determine whether or not an exception will propagate. So we get rid of it. But this causes some crazy debugger tests to fail, because they rely on an exception from uriloader/exthandler/nsHandlerService.js getting squelched, and can't handle anybody reporting errors to the console service at the particular moment of contortionism when the exception is raised. So we need to introduce an explicit mechanism to disable the error reporter here to keep things running. Second, we have to be very careful about tracking the return status of the xpcshell binary. The old code would simply flag an error code if the error handler was invoked, and we can mostly continue to do that. But there are some complications. See the comments. Finally, we don't anything analogous in XPCShellEnvironment, because I have patches in bug 889714 to remove its state-dependence on the error reporter. I'll switch it to SystemErrorReporter in that bug. |
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