* [PATCH] Always emit =thread-exited notifications, even if silent
@ 2022-06-24 14:44 Pedro Alves
2022-07-11 18:50 ` Pedro Alves
0 siblings, 1 reply; 2+ messages in thread
From: Pedro Alves @ 2022-06-24 14:44 UTC (permalink / raw)
To: gdb-patches
[Note: the testcased added by this commit depends on
https://sourceware.org/pipermail/gdb-patches/2022-June/190259.html,
otherwise GDB just crashes when detaching the core]
Currently, in MI, =thread-created are always emitted, like:
=thread-group-started,id="i1",pid="195680"
=thread-created,id="1",group-id="i1"
...
but on teardown, if the target uses exit_inferior_silent, then you'll
only see the inferior exit notification (thread-group-exited), no
notification for threads.
The core target is one of the few targets that use
exit_inferior_silent. Here's an example session:
-target-select core $corefile
=thread-group-started,id="i1",pid="195680"
=thread-created,id="1",group-id="i1"
...
^connected,frame=....
(gdb)
-target-detach
=thread-group-exited,id="i1"
^done
(gdb)
This imbalance of emitting =thread-created but then not =thread-exited
seems off to me. (And, it complicates changes I want to do to
centralize emitting thread exit notifications for the CLI, which is
why I'm looking at this.)
And then, since most other targets use exit_inferior instead of
exit_inferior_silent, MI is already emitting =thread-exited
notifications when tearing down an inferior, for most targets.
This commit makes MI always emit the =thread-exited notifications,
even for exit_inferior_silent.
Afterwards, when debugging a core, MI outputs:
(gdb)
-target-detach
=thread-exited,id="1",group-id="i1" << new line
=thread-group-exited,id="i1"
^done
(gdb)
Surprisingly, there's no MI testcase debugging a core file. This
commit adds the first.
Change-Id: I5100501a46f07b6bbad3e04d120c2562a51c93a4
---
gdb/mi/mi-interp.c | 3 --
gdb/testsuite/gdb.mi/mi-corefile.c | 27 +++++++++++
gdb/testsuite/gdb.mi/mi-corefile.exp | 69 ++++++++++++++++++++++++++++
3 files changed, 96 insertions(+), 3 deletions(-)
create mode 100644 gdb/testsuite/gdb.mi/mi-corefile.c
create mode 100644 gdb/testsuite/gdb.mi/mi-corefile.exp
diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
index 8d6e0334a90..937a3d9d6f5 100644
--- a/gdb/mi/mi-interp.c
+++ b/gdb/mi/mi-interp.c
@@ -358,9 +358,6 @@ mi_new_thread (struct thread_info *t)
static void
mi_thread_exit (struct thread_info *t, int silent)
{
- if (silent)
- return;
-
SWITCH_THRU_ALL_UIS ()
{
struct mi_interp *mi = as_mi_interp (top_level_interpreter ());
diff --git a/gdb/testsuite/gdb.mi/mi-corefile.c b/gdb/testsuite/gdb.mi/mi-corefile.c
new file mode 100644
index 00000000000..58e6f35a61a
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/mi-corefile.c
@@ -0,0 +1,27 @@
+/* Copyright 2022 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Simple little program that just generates a core dump. */
+
+#include <stdlib.h>
+
+int
+main (int argc, char **argv)
+{
+ abort ();
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.mi/mi-corefile.exp b/gdb/testsuite/gdb.mi/mi-corefile.exp
new file mode 100644
index 00000000000..d8ca6b3b34f
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/mi-corefile.exp
@@ -0,0 +1,69 @@
+# Copyright 2022 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Test loading and unloading a core file.
+
+load_lib mi-support.exp
+set MIFLAGS "-i=mi"
+
+if ![isnative] then {
+ return
+}
+
+standard_testfile
+
+if {[build_executable $testfile.exp $testfile $srcfile debug] == -1} {
+ untested "failed to compile"
+ return -1
+}
+
+set corefile [core_find $binfile {}]
+if {$corefile == ""} {
+ return 0
+}
+
+if [mi_gdb_start] {
+ return
+}
+
+# Test loading and unloading a core file.
+
+proc test_core_file {} {
+ mi_delete_breakpoints
+ mi_gdb_reinitialize_dir $::srcdir/$::subdir
+ mi_gdb_load ${::binfile}
+
+ # This also tests that MI emits paired =thread-created and
+ # =thread-exited notifications when loading and unloading the
+ # core. At some point, GDB emitted =thread-created notifications,
+ # but not =thread-exited notifications.
+
+ mi_gdb_test \
+ "-target-select core $::corefile" \
+ [multi_line \
+ "=thread-group-started,id=\"i1\",.*" \
+ "=thread-created,id=\"1\",group-id=\"i1\"" \
+ ".*\\^connected,frame=.*"] \
+ "-target-select core \$corefile"
+
+ mi_gdb_test \
+ "-target-detach" \
+ [multi_line \
+ "=thread-exited,id=\"1\",group-id=\"i1\"" \
+ "=thread-group-exited,id=\"i1\"" \
+ ".*\\^done"]
+}
+
+test_core_file
base-commit: 9704b8b4bc58f4f464961cca97d362fd33740ce8
--
2.36.0
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] Always emit =thread-exited notifications, even if silent
2022-06-24 14:44 [PATCH] Always emit =thread-exited notifications, even if silent Pedro Alves
@ 2022-07-11 18:50 ` Pedro Alves
0 siblings, 0 replies; 2+ messages in thread
From: Pedro Alves @ 2022-07-11 18:50 UTC (permalink / raw)
To: gdb-patches
I've merged this to master now.
On 2022-06-24 3:44 p.m., Pedro Alves wrote:
> [Note: the testcased added by this commit depends on
> https://sourceware.org/pipermail/gdb-patches/2022-June/190259.html,
> otherwise GDB just crashes when detaching the core]
>
> Currently, in MI, =thread-created are always emitted, like:
>
> =thread-group-started,id="i1",pid="195680"
> =thread-created,id="1",group-id="i1"
> ...
>
> but on teardown, if the target uses exit_inferior_silent, then you'll
> only see the inferior exit notification (thread-group-exited), no
> notification for threads.
>
> The core target is one of the few targets that use
> exit_inferior_silent. Here's an example session:
>
> -target-select core $corefile
> =thread-group-started,id="i1",pid="195680"
> =thread-created,id="1",group-id="i1"
> ...
> ^connected,frame=....
> (gdb)
> -target-detach
> =thread-group-exited,id="i1"
> ^done
> (gdb)
>
> This imbalance of emitting =thread-created but then not =thread-exited
> seems off to me. (And, it complicates changes I want to do to
> centralize emitting thread exit notifications for the CLI, which is
> why I'm looking at this.)
>
> And then, since most other targets use exit_inferior instead of
> exit_inferior_silent, MI is already emitting =thread-exited
> notifications when tearing down an inferior, for most targets.
>
> This commit makes MI always emit the =thread-exited notifications,
> even for exit_inferior_silent.
>
> Afterwards, when debugging a core, MI outputs:
>
> (gdb)
> -target-detach
> =thread-exited,id="1",group-id="i1" << new line
> =thread-group-exited,id="i1"
> ^done
> (gdb)
>
> Surprisingly, there's no MI testcase debugging a core file. This
> commit adds the first.
>
> Change-Id: I5100501a46f07b6bbad3e04d120c2562a51c93a4
> ---
> gdb/mi/mi-interp.c | 3 --
> gdb/testsuite/gdb.mi/mi-corefile.c | 27 +++++++++++
> gdb/testsuite/gdb.mi/mi-corefile.exp | 69 ++++++++++++++++++++++++++++
> 3 files changed, 96 insertions(+), 3 deletions(-)
> create mode 100644 gdb/testsuite/gdb.mi/mi-corefile.c
> create mode 100644 gdb/testsuite/gdb.mi/mi-corefile.exp
>
> diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
> index 8d6e0334a90..937a3d9d6f5 100644
> --- a/gdb/mi/mi-interp.c
> +++ b/gdb/mi/mi-interp.c
> @@ -358,9 +358,6 @@ mi_new_thread (struct thread_info *t)
> static void
> mi_thread_exit (struct thread_info *t, int silent)
> {
> - if (silent)
> - return;
> -
> SWITCH_THRU_ALL_UIS ()
> {
> struct mi_interp *mi = as_mi_interp (top_level_interpreter ());
> diff --git a/gdb/testsuite/gdb.mi/mi-corefile.c b/gdb/testsuite/gdb.mi/mi-corefile.c
> new file mode 100644
> index 00000000000..58e6f35a61a
> --- /dev/null
> +++ b/gdb/testsuite/gdb.mi/mi-corefile.c
> @@ -0,0 +1,27 @@
> +/* Copyright 2022 Free Software Foundation, Inc.
> +
> + This file is part of GDB.
> +
> + This program is free software; you can redistribute it and/or modify
> + it under the terms of the GNU General Public License as published by
> + the Free Software Foundation; either version 3 of the License, or
> + (at your option) any later version.
> +
> + This program is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + GNU General Public License for more details.
> +
> + You should have received a copy of the GNU General Public License
> + along with this program. If not, see <http://www.gnu.org/licenses/>. */
> +
> +/* Simple little program that just generates a core dump. */
> +
> +#include <stdlib.h>
> +
> +int
> +main (int argc, char **argv)
> +{
> + abort ();
> + return 0;
> +}
> diff --git a/gdb/testsuite/gdb.mi/mi-corefile.exp b/gdb/testsuite/gdb.mi/mi-corefile.exp
> new file mode 100644
> index 00000000000..d8ca6b3b34f
> --- /dev/null
> +++ b/gdb/testsuite/gdb.mi/mi-corefile.exp
> @@ -0,0 +1,69 @@
> +# Copyright 2022 Free Software Foundation, Inc.
> +
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 3 of the License, or
> +# (at your option) any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program. If not, see <http://www.gnu.org/licenses/>.
> +
> +# Test loading and unloading a core file.
> +
> +load_lib mi-support.exp
> +set MIFLAGS "-i=mi"
> +
> +if ![isnative] then {
> + return
> +}
> +
> +standard_testfile
> +
> +if {[build_executable $testfile.exp $testfile $srcfile debug] == -1} {
> + untested "failed to compile"
> + return -1
> +}
> +
> +set corefile [core_find $binfile {}]
> +if {$corefile == ""} {
> + return 0
> +}
> +
> +if [mi_gdb_start] {
> + return
> +}
> +
> +# Test loading and unloading a core file.
> +
> +proc test_core_file {} {
> + mi_delete_breakpoints
> + mi_gdb_reinitialize_dir $::srcdir/$::subdir
> + mi_gdb_load ${::binfile}
> +
> + # This also tests that MI emits paired =thread-created and
> + # =thread-exited notifications when loading and unloading the
> + # core. At some point, GDB emitted =thread-created notifications,
> + # but not =thread-exited notifications.
> +
> + mi_gdb_test \
> + "-target-select core $::corefile" \
> + [multi_line \
> + "=thread-group-started,id=\"i1\",.*" \
> + "=thread-created,id=\"1\",group-id=\"i1\"" \
> + ".*\\^connected,frame=.*"] \
> + "-target-select core \$corefile"
> +
> + mi_gdb_test \
> + "-target-detach" \
> + [multi_line \
> + "=thread-exited,id=\"1\",group-id=\"i1\"" \
> + "=thread-group-exited,id=\"i1\"" \
> + ".*\\^done"]
> +}
> +
> +test_core_file
>
> base-commit: 9704b8b4bc58f4f464961cca97d362fd33740ce8
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-06-24 14:44 [PATCH] Always emit =thread-exited notifications, even if silent Pedro Alves
2022-07-11 18:50 ` Pedro Alves
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