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Re: Major revision for error handling in the interpreter

From: Pantxo
Subject: Re: Major revision for error handling in the interpreter
Date: Sun, 6 Oct 2019 16:39:31 -0500 (CDT)

John W. Eaton wrote
> With the changeset
>    http://hg.savannah.gnu.org/hgweb/octave/rev/fd32c1a9b1bd
> the "error" function (and similar functions that ultimately call it), 
> simply throws an exception that contains information about the error 
> (message, id, stack info) instead of printing an error message 
> immediately and then throwing an exception.
> It is now the responsibility of any code that catches an execution 
> exception to determine whether and when to display error messages.  I 
> believe that I have made all the necessary changes so that errors are 
> still displayed where they should be, but I may have missed something. 
> If you notice that error messages are not displayed correctly, please 
> submit a bug report for the problem.
> The new approach is more flexible and allows for some simplification of 
> the error message routines as they no longer need feedback from the 
> interpreter to know when to display or buffer messages.
> jwe

I have tried to call "error" from the GUI thread, namely in
gl2ps_renderer::draw_axes, and this now crashes Octave. Does this mean that
we need to redo the mechanism for rethrowing exceptions in
octave_qapplication::notify and GLCanvas::do_print?


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