Re: [PATCH][gdb] Only force INTERP_CONSOLE ui_out for breakpoint commands in MI mode

Tom de Vries
2019-10-03T13:51:14Z

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On 03-10-19 14:10, Pedro Alves wrote:
> On 10/3/19 11:01 AM, Tom de Vries wrote:
>> The problem is that the '#0 main () at test.c:19' ends up in the gdb output
>> output rather than in gdb.txt. This is due to the fact that the redirect is
>> setup for the current ui_out (which is tui->interp_ui_out ()), while the
>> backtrace output is printed to the INTERP_CONSOLE ui_out.
>>
>> Fix this by limiting switching to INTERP_CONSOLE ui_out to when INTERP_MI is
>> active.
>
>> --- a/gdb/cli/cli-script.c
>> +++ b/gdb/cli/cli-script.c
>> @@ -697,6 +697,9 @@ execute_control_command_1 (struct command_line *cmd, int from_tty)
>> enum command_control_type
>> execute_control_command (struct command_line *cmd, int from_tty)
>> {
>> + if (!current_interp_named_p (INTERP_MI))
>> + return execute_control_command_1 (cmd, from_tty);
>
> Wouldn't we need to handle INTERP_MI1/INTERP_MI2/INTERP_MI3 as well?
>
> Would
>
> if (current_uiout->is_mi_like_p ())
>
> instead work?

Yep, that works as well. Patch updated accordingly and re-tested.

OK for trunk?

Thanks,
- Tom

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[gdb] Only force INTERP_CONSOLE ui_out for breakpoint commands in MI mode

The problem reported in PR mi/25055 is that the output of the backtrace
command, when executed as breakpoint command does not show when executing
using the MI interpreter:
...
$ gdb a.out
Reading symbols from a.out...
(gdb) break main
Breakpoint 1 at 0x4003c0: file test.c, line 19.
(gdb) commands
Type commands for breakpoint(s) 1, one per line.
End with a line saying just "end".
>bt
>end
(gdb) interpreter-exec mi "-exec-run"
^done

Breakpoint 1, main () at test.c:19
19 return foo (4);
(gdb)
...

Interestingly, the function print_frame is called twice during -exec-run:
- once during tui_on_normal_stop where the ui_out is temporarily set to
tui->interp_ui_out (), resulting in the part after the comma in
"Breakpoint 1, main () at test.c:19"
- once during execute_control_command, where the ui_out is the default for the
current interpreter: mi_ui_out, which ignores calls to output text.

The commit 3a87ae656c2 "Use console uiout when executing breakpoint commands"
fixes the problem by temporarily switching to the ui_out of INTERP_CONSOLE in
execute_control_command.

This however caused a regression in redirection (escaping '#' using '\' for
git commit message convenience):
...
$ rm -f gdb.txt; gdb a.out
Reading symbols from a.out...
(gdb) break main
Breakpoint 1 at 0x4003c0: file test.c, line 19.
(gdb) commands
Type commands for breakpoint(s) 1, one per line.
End with a line saying just "end".
>bt
>end
(gdb) set logging redirect on
(gdb) set logging on
Redirecting output to gdb.txt.
Copying debug output to gdb.txt.
(gdb) run
\#0 main () at test.c:19
(gdb) q
A debugging session is active.

Inferior 1 [process 22428] will be killed.

Quit anyway? (y or n) y
$ cat gdb.txt
Starting program: /data/gdb_versions/devel/a.out

Breakpoint 1, main () at test.c:19
19 return foo (4);
...

The problem is that the '#0 main () at test.c:19' ends up in the gdb output
output rather than in gdb.txt. This is due to the fact that the redirect is
setup for the current ui_out (which is tui->interp_ui_out ()), while the
backtrace output is printed to the INTERP_CONSOLE ui_out.

Fix this by limiting switching to INTERP_CONSOLE ui_out to when INTERP_MI is
active.

Tested on x86_64-linux.

gdb/ChangeLog:

2019-10-02 Tom de Vries <tdevries@suse.de>

PR gdb/24956
* cli/cli-script.c (execute_control_command): Only switch to
INTERP_CONSOLE's ui_out when INTERP_MI is active.

gdb/testsuite/ChangeLog:

2019-10-02 Tom de Vries <tdevries@suse.de>

PR gdb/24956
* gdb.base/ui-redirect.exp: Test output of user-defined command.

---
gdb/cli/cli-script.c | 3 +++
gdb/testsuite/gdb.base/ui-redirect.exp | 21 +++++++++++++++++++++
2 files changed, 24 insertions(+)

diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index 4fc9c70259c..c460792daff 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -697,6 +697,9 @@ execute_control_command_1 (struct command_line *cmd, int from_tty)
enum command_control_type
execute_control_command (struct command_line *cmd, int from_tty)
{
+ if (!current_uiout->is_mi_like_p ())
+ return execute_control_command_1 (cmd, from_tty);
+
/* Make sure we use the console uiout. It's possible that we are executing
breakpoint commands while running the MI interpreter. */
interp *console = interp_lookup (current_ui, INTERP_CONSOLE);
diff --git a/gdb/testsuite/gdb.base/ui-redirect.exp b/gdb/testsuite/gdb.base/ui-redirect.exp
index efcac14b7cc..932c74af4b5 100644
--- a/gdb/testsuite/gdb.base/ui-redirect.exp
+++ b/gdb/testsuite/gdb.base/ui-redirect.exp
@@ -57,6 +57,24 @@ set cmds "$cmds\n"
set outdir [standard_output_file {}]
set cmds_file "$outdir/cmds.txt"

+with_test_prefix "userdefined" {
+ set test "define userdefined"
+ gdb_test_multiple $test $test {
+ -re "End with a line saying just \"end\"\\.\r\n>$" {
+ pass $test
+ }
+ }
+
+ set test "bt"
+ gdb_test_multiple $test $test {
+ -re "\r\n>$" {
+ pass $test
+ }
+ }
+
+ gdb_test_no_output "end"
+}
+
with_test_prefix "logging" {
gdb_test_no_output "set logging file /dev/null"
gdb_test "set logging on" \
@@ -64,6 +82,7 @@ with_test_prefix "logging" {
gdb_test "save breakpoints $cmds_file" "Saved to file '$cmds_file'\\." \
"save breakpoints cmds.txt"
cmp_file_string "$cmds_file" "$cmds" "cmds.txt"
+ gdb_test "userdefined" "#0 main ().*"
gdb_test "set logging off" "Done logging to /dev/null\\."
gdb_test "help" "List of classes of commands:.*"
}
@@ -74,6 +93,7 @@ with_test_prefix "redirect" {
"Redirecting output to /dev/null.*Copying debug output to /dev/null\\."
gdb_test_no_output "save breakpoints $cmds_file" "save breakpoints cmds.txt"
cmp_file_string "$cmds_file" "$cmds" "cmds.txt"
+ gdb_test_no_output "userdefined"
gdb_test "set logging off" "Done logging to /dev/null\\."
gdb_test "help" "List of classes of commands:.*"
}
@@ -87,6 +107,7 @@ with_test_prefix "redirect while already logging" {
gdb_test "save breakpoints $cmds_file" "Saved to file '$cmds_file'\\." \
"save breakpoints cmds.txt"
cmp_file_string "$cmds_file" "$cmds" "cmds.txt"
+ gdb_test "userdefined" "#0 main ().*"
gdb_test "set logging off" "Done logging to /dev/null\\."
gdb_test "help" "List of classes of commands:.*"
gdb_test_no_output "set logging redirect off"