gdb/
2009-05-28 Pedro Alves <pedro@codesourcery.com> * infrun.c (handle_inferior_event): When thread hoping, switch inferior_ptid to the event thread before removing breakpoints from the target. If not stopping, also try to revert back to a thread that was doing a "next". Check if that thread still exists before resuming. (currently_stepping_thread): Delete and merge with ... (currently_stepping): ... this. (currently_stepping_callback): Rename to ... (currently_stepping_or_nexting_callback): ... this, and also return true if the thread was stepping over a call (has a step-resume breakpoint). gdb/testsuite/ 2009-05-28 Pedro Alves <pedro@codesourcery.com> * gdb.threads/threxit-hop-specific.c: New. * gdb.threads/threxit-hop-specific.exp: New. * gdb.threads/thread-execl.c: New. * gdb.threads/thread-execl.exp: New.
This commit is contained in:
Pedro Alves
parent
8f5008704e
commit
b3444185bd
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@ -1,3 +1,17 @@
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2009-05-28 Pedro Alves <pedro@codesourcery.com>
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* infrun.c (handle_inferior_event): When thread hoping, switch
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inferior_ptid to the event thread before removing breakpoints from
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the target. If not stopping, also try to revert back to a thread
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that was doing a "next". Check if that thread still exists before
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resuming.
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(currently_stepping_thread): Delete and merge with ...
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(currently_stepping): ... this.
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(currently_stepping_callback): Rename to ...
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(currently_stepping_or_nexting_callback): ... this, and also
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return true if the thread was stepping over a call (has a
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step-resume breakpoint).
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2009-05-28 Tom Tromey <tromey@redhat.com>
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* python/python.c (gdbpy_parameter): Rename. Fix error message.
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65
gdb/infrun.c
65
gdb/infrun.c
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@ -75,7 +75,8 @@ static void set_schedlock_func (char *args, int from_tty,
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static int currently_stepping (struct thread_info *tp);
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static int currently_stepping_callback (struct thread_info *tp, void *data);
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static int currently_stepping_or_nexting_callback (struct thread_info *tp,
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void *data);
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static void xdb_handle_command (char *args, int from_tty);
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@ -2896,6 +2897,11 @@ targets should add new threads to the thread list themselves in non-stop mode.")
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if (debug_infrun)
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fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n");
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/* Switch context before touching inferior memory, the
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previous thread may have exited. */
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if (!ptid_equal (inferior_ptid, ecs->ptid))
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context_switch (ecs->ptid);
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/* Saw a breakpoint, but it was hit by the wrong thread.
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Just continue. */
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@ -2922,9 +2928,6 @@ targets should add new threads to the thread list themselves in non-stop mode.")
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error (_("Cannot step over breakpoint hit in wrong thread"));
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else
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{ /* Single step */
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if (!ptid_equal (inferior_ptid, ecs->ptid))
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context_switch (ecs->ptid);
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if (!non_stop)
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{
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/* Only need to require the next event from this
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@ -3483,7 +3486,7 @@ infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
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if (!non_stop)
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{
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struct thread_info *tp;
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tp = iterate_over_threads (currently_stepping_callback,
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tp = iterate_over_threads (currently_stepping_or_nexting_callback,
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ecs->event_thread);
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if (tp)
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{
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@ -3498,6 +3501,21 @@ infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
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return;
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}
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/* If the stepping thread exited, then don't try reverting
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back to it, just keep going. We need to query the target
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in case it doesn't support thread exit events. */
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if (is_exited (tp->ptid)
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|| !target_thread_alive (tp->ptid))
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{
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if (debug_infrun)
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fprintf_unfiltered (gdb_stdlog, "\
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infrun: not switching back to stepped thread, it has vanished\n");
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delete_thread (tp->ptid);
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keep_going (ecs);
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return;
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}
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/* Otherwise, we no longer expect a trap in the current thread.
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Clear the trap_expected flag before switching back -- this is
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what keep_going would do as well, if we called it. */
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@ -3931,28 +3949,29 @@ infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
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keep_going (ecs);
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}
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/* Are we in the middle of stepping? */
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static int
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currently_stepping_thread (struct thread_info *tp)
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{
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return (tp->step_range_end && tp->step_resume_breakpoint == NULL)
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|| tp->trap_expected
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|| tp->stepping_through_solib_after_catch;
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}
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static int
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currently_stepping_callback (struct thread_info *tp, void *data)
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{
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/* Return true if any thread *but* the one passed in "data" is
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in the middle of stepping. */
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return tp != data && currently_stepping_thread (tp);
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}
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/* Is thread TP in the middle of single-stepping? */
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static int
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currently_stepping (struct thread_info *tp)
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{
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return currently_stepping_thread (tp) || bpstat_should_step ();
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return ((tp->step_range_end && tp->step_resume_breakpoint == NULL)
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|| tp->trap_expected
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|| tp->stepping_through_solib_after_catch
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|| bpstat_should_step ());
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}
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/* Returns true if any thread *but* the one passed in "data" is in the
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middle of stepping or of handling a "next". */
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static int
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currently_stepping_or_nexting_callback (struct thread_info *tp, void *data)
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{
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if (tp == data)
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return 0;
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return (tp->step_range_end
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|| tp->trap_expected
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|| tp->stepping_through_solib_after_catch);
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}
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/* Inferior has stepped into a subroutine call with source code that
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@ -1,3 +1,10 @@
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2009-05-28 Pedro Alves <pedro@codesourcery.com>
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* gdb.threads/threxit-hop-specific.c: New.
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* gdb.threads/threxit-hop-specific.exp: New.
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* gdb.threads/thread-execl.c: New.
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* gdb.threads/thread-execl.exp: New.
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2009-05-27 Tom Tromey <tromey@redhat.com>
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Thiago Jung Bauermann <bauerman@br.ibm.com>
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@ -0,0 +1,48 @@
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <pthread.h>
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#include <unistd.h>
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#include <stdlib.h>
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static const char *image;
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void *
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thread_execler (void *arg)
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{
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/* Exec ourselves again. */
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if (execl (image, image, NULL) == -1)
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{
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perror ("execl");
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abort ();
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}
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return NULL;
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}
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int
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main (int argc, char **argv)
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{
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pthread_t thread;
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image = argv[0];
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pthread_create (&thread, NULL, thread_execler, NULL);
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pthread_join (thread, NULL);
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return 0;
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}
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@ -0,0 +1,53 @@
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# Copyright (C) 2009 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test that GDB doesn't get stuck when stepping over an exec call done
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# by a thread other than the main thread.
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# There's no support for exec events in the remote protocol.
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if { [is_remote target] } {
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return 0
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}
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set testfile "thread-execl"
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set srcfile ${testfile}.c
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set binfile ${objdir}/${subdir}/${testfile}
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if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
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executable [list debug "incdir=${objdir}"]] != "" } {
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return -1
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}
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# Start with a fresh gdb.
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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runto_main
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# Get ourselves to the thread that execs
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gdb_breakpoint "thread_execler"
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gdb_test "continue" ".*thread_execler.*" "continue to thread start"
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# Now set a breakpoint at `main', and step over the execl call. The
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# breakpoint at main should be reached. GDB should not try to revert
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# back to the old thread from the old image and resume stepping it
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# (since it is gone).
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gdb_breakpoint "main"
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gdb_test "next" ".*main.*" "get to main in new image"
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return 0
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@ -0,0 +1,48 @@
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <pthread.h>
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#include <unistd.h>
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#include <stdlib.h>
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void *
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thread_function (void *arg)
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{
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/* We'll next over this, with scheduler-locking off. */
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pthread_exit (NULL);
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}
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void
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hop_me (void)
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{
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}
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int
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main (int argc, char **argv)
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{
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pthread_t thread;
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pthread_create (&thread, NULL, thread_function, NULL);
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pthread_join (thread, NULL); /* wait for exit */
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/* The main thread should be able to hop over the breakpoint set
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here... */
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hop_me (); /* set thread specific breakpoint here */
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/* ... and reach here. */
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exit (0); /* set exit breakpoint here */
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}
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@ -0,0 +1,59 @@
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# Copyright (C) 2009 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test that GDB doesn't get stuck when thread hoping over a thread
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# specific breakpoint when the selected thread has gone away.
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set testfile "threxit-hop-specific"
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set srcfile ${testfile}.c
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set binfile ${objdir}/${subdir}/${testfile}
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if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
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executable [list debug "incdir=${objdir}"]] != "" } {
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return -1
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}
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# Start with a fresh gdb.
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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runto_main
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# Get ourselves to the thread that exits
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gdb_breakpoint "thread_function"
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gdb_test "continue" ".*thread_function.*" "continue to thread start"
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# Set a thread specific breakpoint somewhere the main thread will pass
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# by, but make it specific to the thread that is going to exit. Step
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# over the pthread_exit call. GDB should still be able to step over
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# the thread specific breakpoint, and reach the other breakpoint,
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# which is not thread specific.
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set bpthrline [gdb_get_line_number "set thread specific breakpoint here"]
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gdb_test "break $bpthrline thread 2" \
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"Breakpoint .*$srcfile.*$bpthrline.*" \
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"set thread specific breakpoint"
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set bpexitline [gdb_get_line_number "set exit breakpoint here"]
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gdb_breakpoint "$bpexitline"
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gdb_test "next" \
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".*set exit breakpoint here.*" \
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"get past the thread specific breakpoint"
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return 0
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