[PATCH][gdb] Make INTERP_TUI's default ui_out the INTERP_CONSOLE ui_out

Tom de Vries
2019-09-05T09:58:29Z

Hi,

When calling the bt command using a user-defined command while logging with
redirect (escaping '#' using '\' for git commit message convenience):
...
$ gdb -q a.out
Reading symbols from a.out...
(gdb) define mybt
Type commands for definition of "mybt".
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) start
(gdb) mybt
\#0 main () at hello.c:9
...
we get the bt output (the '#0 main () at hello.c:9' above) in the gdb
output rather than in the log file gdb.txt:
...
$ cat gdb.txt
Temporary breakpoint 1 at 0x40053b: file hello.c, line 9.
Starting program: /data/gdb_versions/devel/a.out

Temporary breakpoint 1, main () at hello.c:9
9 printf ("hello\n");
...

If we do the same using "bt" instead of "mybt", the output does end up in the
log file, and not in the gdb output, as expected.

Also, if we build gdb with --disable-tui, the problem disappears.

The problem is caused by:
- the fact that INTERP_TUI maintains two ui_outs, one for TUI mode disabled
(called the default ui_out) and one for TUI mode enabled, combined with
- the fact that the user-defined commands are interpreted by INTERP_CONSOLE,
which has its own ui_out.

With --disable-tui, the main interpreter is INTERP_CONSOLE, so the logging
redirect is setup for INTERP_CONSOLE's ui_out, and the redirect has effect
when interpreting the mybt command.

With --enable-tui, the main interpreter is INTERP_TUI, so the logging
redirect is setup for INTERP_TUI's default ui_out, and the redirect has no
effect when interpreting the mybt command using INTERP_CONSOLE.

Fix this by making INTERP_TUI's default ui_out the console ui_out.

Tested on x86_64-linux.

OK for trunk?

Thanks,
- Tom

[gdb] Make INTERP_TUI's default ui_out the INTERP_CONSOLE ui_out

gdb/ChangeLog:

2019-09-05 Tom de Vries <tdevries@suse.de>

PR gdb/24956
* tui/tui-io.c (tui_initialize_io): Make default ui_out the console
ui_out.

gdb/testsuite/ChangeLog:

2019-09-05 Tom de Vries <tdevries@suse.de>

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

---
gdb/testsuite/gdb.base/ui-redirect.exp | 21 +++++++++++++++++++++
gdb/tui/tui-io.c | 5 ++++-
2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/ui-redirect.exp b/gdb/testsuite/gdb.base/ui-redirect.exp
index 4507ac51a2..a1a81aecac 100644
--- a/gdb/testsuite/gdb.base/ui-redirect.exp
+++ b/gdb/testsuite/gdb.base/ui-redirect.exp
@@ -47,11 +47,30 @@ if ![runto_main] {
gdb_breakpoint "foo"
gdb_breakpoint "bar"

+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" \
"Copying output to /dev/null.*Copying debug output to /dev/null\\."
gdb_test "save breakpoints /dev/null" "Saved to file '/dev/null'\\."
+ gdb_test "userdefined" "#0 main ().*"
gdb_test "set logging off" "Done logging to /dev/null\\."
gdb_test "help" "List of classes of commands:.*"
}
@@ -61,6 +80,7 @@ with_test_prefix "redirect" {
gdb_test "set logging on" \
"Redirecting output to /dev/null.*Copying debug output to /dev/null\\."
gdb_test_no_output "save breakpoints /dev/null"
+ gdb_test_no_output "userdefined"
gdb_test "set logging off" "Done logging to /dev/null\\."
gdb_test "help" "List of classes of commands:.*"
}
@@ -72,6 +92,7 @@ with_test_prefix "redirect while already logging" {
gdb_test "set logging redirect on" \
".*warning: Currently logging .*Turn the logging off and on to make the new setting effective.*"
gdb_test "save breakpoints /dev/null" "Saved to file '/dev/null'\\."
+ 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"
diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index ee581a2ff6..eab894325a 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -43,6 +43,7 @@
#include "gdbsupport/filestuff.h"
#include "completer.h"
#include "gdb_curses.h"
+#include "interps.h"
#include

/* This redefines CTRL if it is not already defined, so it must come
@@ -870,7 +871,9 @@ tui_initialize_io (void)
tui_out = tui_out_new (tui_stdout);

/* Create the default UI. */
- tui_old_uiout = cli_out_new (gdb_stdout);
+ struct interp *interp = interp_lookup (current_ui, "console");
+ tui_old_uiout = dynamic_cast<cli_ui_out *> (interp->interp_ui_out());
+ gdb_assert (tui_old_uiout != nullptr);

#ifdef TUI_USE_PIPE_FOR_READLINE
/* Temporary solution for readline writing to stdout: redirect