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* [binutils-gdb] Always emit =thread-exited notifications, even if silent
@ 2022-07-11 18:50 Pedro Alves
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From: Pedro Alves @ 2022-07-11 18:50 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a78ef8757418105c35685c5d82b9fdf79459321b
commit a78ef8757418105c35685c5d82b9fdf79459321b
Author: Pedro Alves <pedro@palves.net>
Date: Wed Jun 22 18:10:00 2022 +0100
Always emit =thread-exited notifications, even if silent
[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
Diff:
---
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(-)
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
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