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* [Bug gdb/29968] New: [gdb/dap] silent exceptions when using DAP
@ 2023-01-06 13:53 vries at gcc dot gnu.org
  2023-01-06 14:04 ` [Bug gdb/29968] " vries at gcc dot gnu.org
  2023-01-06 19:34 ` tromey at sourceware dot org
  0 siblings, 2 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2023-01-06 13:53 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=29968

            Bug ID: 29968
           Summary: [gdb/dap] silent exceptions when using DAP
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

When reproducing the problem fixed by commit 954a1f9183c ("[gdb/python] Avoid
queue.SimpleQueue for python 3.6"), by reverting the commit, I get:
...
$ gdb -q -i dap
$
...
So gdb, just exits.

By echoing the exit status I get confirmation that indeed something is wrong:
...
$ gdb -q -i dap; echo $?
1
$
...

Only by debugging and doing catch throw do I find out that I'm running into a
python exception.

It would be nice if gdb would somehow print exceptions.

By doing catch catch do I see that indeed exception_print is called in
gdb_main:
...
1329          exception_print (gdb_stderr, ex);
...
with the exception ex containing the desired message, but that seems to have no
visible effect.

I tried some obvious-looking things after executing the exception_print, trying
to get the printed text to somehow appear:
...
(gdb) call (void)fflush (0)
(gdb) call gdb_flush (*current_ui_gdb_stderr_ptr ())
(gdb) call gdb_flush (*current_ui_gdb_stdout_ptr ())
(gdb) call (void)fflush (0)
...
but no luck.

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* [Bug gdb/29968] [gdb/dap] silent exceptions when using DAP
  2023-01-06 13:53 [Bug gdb/29968] New: [gdb/dap] silent exceptions when using DAP vries at gcc dot gnu.org
@ 2023-01-06 14:04 ` vries at gcc dot gnu.org
  2023-01-06 19:34 ` tromey at sourceware dot org
  1 sibling, 0 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2023-01-06 14:04 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=29968

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

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^ permalink raw reply	[flat|nested] 3+ messages in thread

* [Bug gdb/29968] [gdb/dap] silent exceptions when using DAP
  2023-01-06 13:53 [Bug gdb/29968] New: [gdb/dap] silent exceptions when using DAP vries at gcc dot gnu.org
  2023-01-06 14:04 ` [Bug gdb/29968] " vries at gcc dot gnu.org
@ 2023-01-06 19:34 ` tromey at sourceware dot org
  1 sibling, 0 replies; 3+ messages in thread
From: tromey at sourceware dot org @ 2023-01-06 19:34 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=29968

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I don't think gdb can really print anything, because
the output has to follow the JSON-RPC protocol.
Previously I had this mode not redirect stderr,
but that turned out not to work with the client we're using.
There is a logging setting that the test suite uses though.

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^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2023-01-06 19:34 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-01-06 13:53 [Bug gdb/29968] New: [gdb/dap] silent exceptions when using DAP vries at gcc dot gnu.org
2023-01-06 14:04 ` [Bug gdb/29968] " vries at gcc dot gnu.org
2023-01-06 19:34 ` tromey at sourceware dot org

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