+2013-10-06 Sergio Durigan Junior <sergiodj@redhat.com>
+
+ * NEWS: Mention new convenience variable $_exitsignal.
+ * corelow.c (core_open): Reset exit convenience variables. Set
+ $_exitsignal to the uncaught signal which generated the corefile.
+ * infrun.c (handle_inferior_event): Reset exit convenience
+ variables. Set $_exitsignal for TARGET_WAITKIND_SIGNALLED.
+ (clear_exit_convenience_vars): New function.
+ * inferior.h (clear_exit_convenience_vars): New prototype.
+
2013-10-06 Yao Qi <yao@codesourcery.com>
* varobj.h: Add comments to enum varobj_languages.
* The exception-related catchpoints, like "catch throw", now accept a
regular expression which can be used to filter exceptions by type.
+* The new convenience variable $_exitsignal is automatically set to
+ the terminating signal number when the program being debugged dies
+ due to an uncaught signal.
+
* MI changes
** The -trace-save MI command can optionally save trace buffer in Common
if (p)
printf_filtered (_("Core was generated by `%s'.\n"), p);
+ /* Clearing any previous state of convenience variables. */
+ clear_exit_convenience_vars ();
+
siggy = bfd_core_file_failing_signal (core_bfd);
if (siggy > 0)
{
printf_filtered (_("Program terminated with signal %s, %s.\n"),
gdb_signal_to_name (sig), gdb_signal_to_string (sig));
+
+ /* Set the value of the internal variable $_exitsignal,
+ which holds the signal uncaught by the inferior. */
+ set_internalvar_integer (lookup_internalvar ("_exitsignal"),
+ siggy);
}
/* Fetch all registers from core file. */
+2013-10-06 Sergio Durigan Junior <sergiodj@redhat.com>
+
+ * gdb.texinfo (Convenience Variables): Document $_exitsignal.
+ Update entry for $_exitcode.
+
2013-10-04 Joel Brobecker <brobecker@adacore.com>
* gdb.texinfo (GDB/MI Program Execution): Document "-exec-run"'s
@item $_exitcode
@vindex $_exitcode@r{, convenience variable}
-The variable @code{$_exitcode} is automatically set to the exit code when
-the program being debugged terminates.
+When the program being debugged terminates normally, @value{GDBN}
+automatically sets this variable to the exit code of the program, and
+resets @code{$_exitsignal} to @code{void}.
+
+@item $_exitsignal
+@vindex $_exitsignal@r{, convenience variable}
+When the program being debugged dies due to an uncaught signal,
+@value{GDBN} automatically sets this variable to that signal's number,
+and resets @code{$_exitcode} to @code{void}.
+
+To distinguish between whether the program being debugged has exited
+(i.e., @code{$_exitcode} is not @code{void}) or signalled (i.e.,
+@code{$_exitsignal} is not @code{void}), the convenience function
+@code{$_isvoid} can be used (@pxref{Convenience Funs,, Convenience
+Functions}). For example, considering the following source code:
+
+@smallexample
+#include <signal.h>
+
+int
+main (int argc, char *argv[])
+@{
+ raise (SIGALRM);
+ return 0;
+@}
+@end smallexample
+
+A valid way of telling whether the program being debugged has exited
+or signalled would be:
+
+@smallexample
+(@value{GDBP}) define has_exited_or_signalled
+Type commands for definition of ``has_exited_or_signalled''.
+End with a line saying just ``end''.
+>if $_isvoid ($_exitsignal)
+ >echo The program has exited\n
+ >else
+ >echo The program has signalled\n
+ >end
+>end
+(@value{GDBP}) run
+Starting program:
+
+Program terminated with signal SIGALRM, Alarm clock.
+The program no longer exists.
+(@value{GDBP}) has_exited_or_signalled
+The program has signalled
+@end smallexample
+
+As can be seen, @value{GDBN} correctly informs that the program being
+debugged has signalled, since it calls @code{raise} and raises a
+@code{SIGALRM} signal. If the program being debugged had not called
+@code{raise}, then @value{GDBN} would report a normal exit:
+
+@smallexample
+(@value{GDBP}) has_exited_or_signalled
+The program has exited
+@end smallexample
@item $_exception
The variable @code{$_exception} is set to the exception object being
void set_step_info (struct frame_info *frame, struct symtab_and_line sal);
+/* Clear the convenience variables associated with the exit of the
+ inferior. Currently, those variables are $_exitcode and
+ $_exitsignal. */
+
+extern void clear_exit_convenience_vars (void);
+
/* From infcmd.c */
extern void post_create_inferior (struct target_ops *, int);
handle_vfork_child_exec_or_exit (0);
target_terminal_ours (); /* Must do this before mourn anyway. */
+ /* Clearing any previous state of convenience variables. */
+ clear_exit_convenience_vars ();
+
if (ecs->ws.kind == TARGET_WAITKIND_EXITED)
{
/* Record the exit code in the convenience variable $_exitcode, so
print_exited_reason (ecs->ws.value.integer);
}
else
- print_signal_exited_reason (ecs->ws.value.sig);
+ {
+ struct regcache *regcache = get_thread_regcache (ecs->ptid);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+
+ if (gdbarch_gdb_signal_to_target_p (gdbarch))
+ {
+ /* Set the value of the internal variable $_exitsignal,
+ which holds the signal uncaught by the inferior. */
+ set_internalvar_integer (lookup_internalvar ("_exitsignal"),
+ gdbarch_gdb_signal_to_target (gdbarch,
+ ecs->ws.value.sig));
+ }
+ else
+ {
+ /* We don't have access to the target's method used for
+ converting between signal numbers (GDB's internal
+ representation <-> target's representation).
+ Therefore, we cannot do a good job at displaying this
+ information to the user. It's better to just warn
+ her about it (if infrun debugging is enabled), and
+ give up. */
+ if (debug_infrun)
+ fprintf_filtered (gdb_stdlog, _("\
+Cannot fill $_exitsignal with the correct signal number.\n"));
+ }
+
+ print_signal_exited_reason (ecs->ws.value.sig);
+ }
gdb_flush (gdb_stdout);
target_mourn_inferior ();
*saved_ptid_ptr = inferior_ptid;
return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
}
+
+/* See inferior.h. */
+
+void
+clear_exit_convenience_vars (void)
+{
+ clear_internalvar (lookup_internalvar ("_exitsignal"));
+ clear_internalvar (lookup_internalvar ("_exitcode"));
+}
\f
/* User interface for reverse debugging:
+2013-10-06 Sergio Durigan Junior <sergiodj@redhat.com>
+
+ * gdb.base/corefile.exp: Test whether $_exitsignal is set and
+ $_exitcode is void when opening a corefile.
+ * gdb.base/exitsignal.exp: New file.
+ * gdb.base/segv.c: Likewise.
+ * gdb.base/normal.c: Likewise.
+
2013-10-04 Joel Brobecker <brobecker@adacore.com>
* gdb.mi/mi-start.c, gdb.mi/mi-start.exp: New files.
gdb_test "print func2::coremaker_local" "\\\$$decimal = \\{0, 1, 2, 3, 4\\}"
+# Test the presence and the correct values of $_exitsignal and
+# $_exitcode variables. The corefile is generated with a SIGABRT,
+# which is "6" in the Linux kernel.
+
+gdb_test "print \$_exitsignal" " = 6" \
+ "\$_exitsignal prints SIGABRT (6)"
+
+gdb_test "print \$_exitcode" " = void" \
+ "\$_exitcode is void"
+
# Somehow we better test the ability to read the registers out of the core
# file correctly. I don't think the other tests do this.
--- /dev/null
+# Copyright 2013 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/>.
+
+# This test checks both $_exitcode and $_exitsignal variables. The
+# purpose of this checking is to ensure that the variables are
+# mutually exclusive, i.e., that when $_exitsignal is set, $_exitcode
+# is not, and vice-versa. This mutual exclusion happens because if an
+# inferior exited (either successfuly or not), it certainly was not
+# killed by a signal. However, if it was killed by an uncaught
+# signal, then there is no way for it to have exited.
+
+if { [target_info exists gdb,nosignals] } {
+ verbose "Skipping exitsignal.exp because of nosignals."
+ continue
+}
+
+standard_testfile segv.c
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
+ return -1
+}
+
+# Run to main
+if { ![runto_main] } {
+ return -1
+}
+
+# Print $_exitsignal. It should be void now, because nothing
+# happened.
+gdb_test "print \$_exitsignal" " = void" \
+ "\$_exitsignal is void before running"
+
+# Just to guarantee, making sure that $_exitcode is also void.
+gdb_test "print \$_exitcode" " = void" \
+ "\$_exitcode is void before running"
+
+# Trigger SIGSEGV.
+gdb_test "continue" "Program received signal SIGSEGV.*" "trigger SIGSEGV"
+
+# Continue until the end.
+gdb_test "continue" "Program terminated with signal SIGSEGV.*" \
+ "program terminated with SIGSEGV"
+
+# Now, print $_exitsignal again. It should be 11 (SIGSEGV).
+gdb_test "print \$_exitsignal" " = 11" \
+ "\$_exitsignal is 11 (SIGSEGV) after SIGSEGV."
+
+# And $_exitcode should still be void, since the inferior died because
+# of a signal, and did not return.
+gdb_test "print \$_exitcode" " = void" \
+ "\$_exitcode is still void after SIGSEGV"
+
+# Re-run to main, i.e., restart the executable.
+rerun_to_main
+
+# Print the $_exitsignal again. Even in this normal scenario, it
+# should still contain the signal triggered in the other run.
+gdb_test "print \$_exitsignal" " = 11" \
+ "\$_exitsignal is 11 (SIGSEGV) after restarting the inferior"
+
+# And, again, print $_exitcode.
+gdb_test "print \$_exitcode" " = void" \
+ "\$_exitcode is still void after restarting the inferior"
+
+# Now we test the behaviour of $_exit{code,signal} during a normal
+# inferior execution.
+standard_testfile normal.c
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
+ return -1
+}
+
+# Checking $_exitsignal and $_exitcode, both should be void before the
+# inferior is executed.
+gdb_test "print \$_exitsignal" " = void" \
+ "\$_exitsignal is void before normal inferior is executed"
+gdb_test "print \$_exitcode" " = void" \
+ "\$_exitcode is void before normal inferior is executed"
+
+# Run the inferior until the end.
+if { ![runto_main] } {
+ return -1
+}
+
+gdb_continue_to_end
+
+# Checking $_exitcode. It should be 0.
+gdb_test "print \$_exitcode" " = 0" \
+ "\$_exitcode is zero after normal inferior is executed"
+
+# Checking $_exitsignal. It should still be void, since the inferior
+# has not received any signal.
+gdb_test "print \$_exitsignal" " = void" \
+ "\$_exitsignal is still void after normal inferior is executed"
--- /dev/null
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013 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/>. */
+
+/* This test is just a normal return 0. */
+
+int
+main (int argc, char *argv[])
+{
+ return 0;
+}
--- /dev/null
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013 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/>. */
+
+/* This test can be used just to generate a SIGSEGV. */
+
+#include <signal.h>
+
+int
+main (int argc, char *argv[])
+{
+ /* Generating a SIGSEGV. */
+ raise (SIGSEGV);
+
+ return 0;
+}
projects / binutils-gdb.git / commitdiff