1385 lines
34 KiB
C
1385 lines
34 KiB
C
/* Multi-process/thread control for GDB, the GNU debugger.
|
|
|
|
Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
|
|
2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
|
|
Free Software Foundation, Inc.
|
|
|
|
Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
|
|
|
|
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/>. */
|
|
|
|
#include "defs.h"
|
|
#include "symtab.h"
|
|
#include "frame.h"
|
|
#include "inferior.h"
|
|
#include "environ.h"
|
|
#include "value.h"
|
|
#include "target.h"
|
|
#include "gdbthread.h"
|
|
#include "exceptions.h"
|
|
#include "command.h"
|
|
#include "gdbcmd.h"
|
|
#include "regcache.h"
|
|
#include "gdb.h"
|
|
#include "gdb_string.h"
|
|
|
|
#include <ctype.h>
|
|
#include <sys/types.h>
|
|
#include <signal.h>
|
|
#include "ui-out.h"
|
|
#include "observer.h"
|
|
#include "annotate.h"
|
|
#include "cli/cli-decode.h"
|
|
|
|
/* Definition of struct thread_info exported to gdbthread.h. */
|
|
|
|
/* Prototypes for exported functions. */
|
|
|
|
void _initialize_thread (void);
|
|
|
|
/* Prototypes for local functions. */
|
|
|
|
static struct thread_info *thread_list = NULL;
|
|
static int highest_thread_num;
|
|
|
|
static void thread_command (char *tidstr, int from_tty);
|
|
static void thread_apply_all_command (char *, int);
|
|
static int thread_alive (struct thread_info *);
|
|
static void info_threads_command (char *, int);
|
|
static void thread_apply_command (char *, int);
|
|
static void restore_current_thread (ptid_t);
|
|
static void prune_threads (void);
|
|
|
|
/* Frontend view of the thread state. Possible extensions: stepping,
|
|
finishing, until(ling),... */
|
|
enum thread_state
|
|
{
|
|
THREAD_STOPPED,
|
|
THREAD_RUNNING,
|
|
THREAD_EXITED,
|
|
};
|
|
|
|
struct thread_info*
|
|
inferior_thread (void)
|
|
{
|
|
struct thread_info *tp = find_thread_ptid (inferior_ptid);
|
|
gdb_assert (tp);
|
|
return tp;
|
|
}
|
|
|
|
void
|
|
delete_step_resume_breakpoint (struct thread_info *tp)
|
|
{
|
|
if (tp && tp->control.step_resume_breakpoint)
|
|
{
|
|
delete_breakpoint (tp->control.step_resume_breakpoint);
|
|
tp->control.step_resume_breakpoint = NULL;
|
|
}
|
|
}
|
|
|
|
void
|
|
delete_exception_resume_breakpoint (struct thread_info *tp)
|
|
{
|
|
if (tp && tp->control.exception_resume_breakpoint)
|
|
{
|
|
delete_breakpoint (tp->control.exception_resume_breakpoint);
|
|
tp->control.exception_resume_breakpoint = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
clear_thread_inferior_resources (struct thread_info *tp)
|
|
{
|
|
/* NOTE: this will take care of any left-over step_resume breakpoints,
|
|
but not any user-specified thread-specific breakpoints. We can not
|
|
delete the breakpoint straight-off, because the inferior might not
|
|
be stopped at the moment. */
|
|
if (tp->control.step_resume_breakpoint)
|
|
{
|
|
tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop;
|
|
tp->control.step_resume_breakpoint = NULL;
|
|
}
|
|
|
|
if (tp->control.exception_resume_breakpoint)
|
|
{
|
|
tp->control.exception_resume_breakpoint->disposition
|
|
= disp_del_at_next_stop;
|
|
tp->control.exception_resume_breakpoint = NULL;
|
|
}
|
|
|
|
bpstat_clear (&tp->control.stop_bpstat);
|
|
|
|
discard_all_intermediate_continuations_thread (tp);
|
|
discard_all_continuations_thread (tp);
|
|
|
|
delete_longjmp_breakpoint (tp->num);
|
|
}
|
|
|
|
static void
|
|
free_thread (struct thread_info *tp)
|
|
{
|
|
clear_thread_inferior_resources (tp);
|
|
|
|
if (tp->private)
|
|
{
|
|
if (tp->private_dtor)
|
|
tp->private_dtor (tp->private);
|
|
else
|
|
xfree (tp->private);
|
|
}
|
|
|
|
xfree (tp);
|
|
}
|
|
|
|
void
|
|
init_thread_list (void)
|
|
{
|
|
struct thread_info *tp, *tpnext;
|
|
|
|
highest_thread_num = 0;
|
|
|
|
if (!thread_list)
|
|
return;
|
|
|
|
for (tp = thread_list; tp; tp = tpnext)
|
|
{
|
|
tpnext = tp->next;
|
|
free_thread (tp);
|
|
}
|
|
|
|
thread_list = NULL;
|
|
}
|
|
|
|
/* Allocate a new thread with target id PTID and add it to the thread
|
|
list. */
|
|
|
|
static struct thread_info *
|
|
new_thread (ptid_t ptid)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
tp = xcalloc (1, sizeof (*tp));
|
|
|
|
tp->ptid = ptid;
|
|
tp->num = ++highest_thread_num;
|
|
tp->next = thread_list;
|
|
thread_list = tp;
|
|
|
|
/* Nothing to follow yet. */
|
|
tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
|
|
tp->state_ = THREAD_STOPPED;
|
|
|
|
return tp;
|
|
}
|
|
|
|
struct thread_info *
|
|
add_thread_silent (ptid_t ptid)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
tp = find_thread_ptid (ptid);
|
|
if (tp)
|
|
/* Found an old thread with the same id. It has to be dead,
|
|
otherwise we wouldn't be adding a new thread with the same id.
|
|
The OS is reusing this id --- delete it, and recreate a new
|
|
one. */
|
|
{
|
|
/* In addition to deleting the thread, if this is the current
|
|
thread, then we need to take care that delete_thread doesn't
|
|
really delete the thread if it is inferior_ptid. Create a
|
|
new template thread in the list with an invalid ptid, switch
|
|
to it, delete the original thread, reset the new thread's
|
|
ptid, and switch to it. */
|
|
|
|
if (ptid_equal (inferior_ptid, ptid))
|
|
{
|
|
tp = new_thread (null_ptid);
|
|
|
|
/* Make switch_to_thread not read from the thread. */
|
|
tp->state_ = THREAD_EXITED;
|
|
switch_to_thread (null_ptid);
|
|
|
|
/* Now we can delete it. */
|
|
delete_thread (ptid);
|
|
|
|
/* Now reset its ptid, and reswitch inferior_ptid to it. */
|
|
tp->ptid = ptid;
|
|
tp->state_ = THREAD_STOPPED;
|
|
switch_to_thread (ptid);
|
|
|
|
observer_notify_new_thread (tp);
|
|
|
|
/* All done. */
|
|
return tp;
|
|
}
|
|
else
|
|
/* Just go ahead and delete it. */
|
|
delete_thread (ptid);
|
|
}
|
|
|
|
tp = new_thread (ptid);
|
|
observer_notify_new_thread (tp);
|
|
|
|
return tp;
|
|
}
|
|
|
|
struct thread_info *
|
|
add_thread_with_info (ptid_t ptid, struct private_thread_info *private)
|
|
{
|
|
struct thread_info *result = add_thread_silent (ptid);
|
|
|
|
result->private = private;
|
|
|
|
if (print_thread_events)
|
|
printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
|
|
|
|
annotate_new_thread ();
|
|
return result;
|
|
}
|
|
|
|
struct thread_info *
|
|
add_thread (ptid_t ptid)
|
|
{
|
|
return add_thread_with_info (ptid, NULL);
|
|
}
|
|
|
|
/* Delete thread PTID. If SILENT, don't notify the observer of this
|
|
exit. */
|
|
static void
|
|
delete_thread_1 (ptid_t ptid, int silent)
|
|
{
|
|
struct thread_info *tp, *tpprev;
|
|
|
|
tpprev = NULL;
|
|
|
|
for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
|
|
if (ptid_equal (tp->ptid, ptid))
|
|
break;
|
|
|
|
if (!tp)
|
|
return;
|
|
|
|
/* If this is the current thread, or there's code out there that
|
|
relies on it existing (refcount > 0) we can't delete yet. Mark
|
|
it as exited, and notify it. */
|
|
if (tp->refcount > 0
|
|
|| ptid_equal (tp->ptid, inferior_ptid))
|
|
{
|
|
if (tp->state_ != THREAD_EXITED)
|
|
{
|
|
observer_notify_thread_exit (tp, silent);
|
|
|
|
/* Tag it as exited. */
|
|
tp->state_ = THREAD_EXITED;
|
|
|
|
/* Clear breakpoints, etc. associated with this thread. */
|
|
clear_thread_inferior_resources (tp);
|
|
}
|
|
|
|
/* Will be really deleted some other time. */
|
|
return;
|
|
}
|
|
|
|
if (tpprev)
|
|
tpprev->next = tp->next;
|
|
else
|
|
thread_list = tp->next;
|
|
|
|
/* Notify thread exit, but only if we haven't already. */
|
|
if (tp->state_ != THREAD_EXITED)
|
|
observer_notify_thread_exit (tp, silent);
|
|
|
|
free_thread (tp);
|
|
}
|
|
|
|
/* Delete thread PTID and notify of thread exit. If this is
|
|
inferior_ptid, don't actually delete it, but tag it as exited and
|
|
do the notification. If PTID is the user selected thread, clear
|
|
it. */
|
|
void
|
|
delete_thread (ptid_t ptid)
|
|
{
|
|
delete_thread_1 (ptid, 0 /* not silent */);
|
|
}
|
|
|
|
void
|
|
delete_thread_silent (ptid_t ptid)
|
|
{
|
|
delete_thread_1 (ptid, 1 /* silent */);
|
|
}
|
|
|
|
struct thread_info *
|
|
find_thread_id (int num)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (tp->num == num)
|
|
return tp;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Find a thread_info by matching PTID. */
|
|
struct thread_info *
|
|
find_thread_ptid (ptid_t ptid)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (ptid_equal (tp->ptid, ptid))
|
|
return tp;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Thread iterator function.
|
|
*
|
|
* Calls a callback function once for each thread, so long as
|
|
* the callback function returns false. If the callback function
|
|
* returns true, the iteration will end and the current thread
|
|
* will be returned. This can be useful for implementing a
|
|
* search for a thread with arbitrary attributes, or for applying
|
|
* some operation to every thread.
|
|
*
|
|
* FIXME: some of the existing functionality, such as
|
|
* "Thread apply all", might be rewritten using this functionality.
|
|
*/
|
|
|
|
struct thread_info *
|
|
iterate_over_threads (int (*callback) (struct thread_info *, void *),
|
|
void *data)
|
|
{
|
|
struct thread_info *tp, *next;
|
|
|
|
for (tp = thread_list; tp; tp = next)
|
|
{
|
|
next = tp->next;
|
|
if ((*callback) (tp, data))
|
|
return tp;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
thread_count (void)
|
|
{
|
|
int result = 0;
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
++result;
|
|
|
|
return result;
|
|
}
|
|
|
|
int
|
|
valid_thread_id (int num)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (tp->num == num)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pid_to_thread_id (ptid_t ptid)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (ptid_equal (tp->ptid, ptid))
|
|
return tp->num;
|
|
|
|
return 0;
|
|
}
|
|
|
|
ptid_t
|
|
thread_id_to_pid (int num)
|
|
{
|
|
struct thread_info *thread = find_thread_id (num);
|
|
|
|
if (thread)
|
|
return thread->ptid;
|
|
else
|
|
return pid_to_ptid (-1);
|
|
}
|
|
|
|
int
|
|
in_thread_list (ptid_t ptid)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (ptid_equal (tp->ptid, ptid))
|
|
return 1;
|
|
|
|
return 0; /* Never heard of 'im. */
|
|
}
|
|
|
|
/* Finds the first thread of the inferior given by PID. If PID is -1,
|
|
return the first thread in the list. */
|
|
|
|
struct thread_info *
|
|
first_thread_of_process (int pid)
|
|
{
|
|
struct thread_info *tp, *ret = NULL;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (pid == -1 || ptid_get_pid (tp->ptid) == pid)
|
|
if (ret == NULL || tp->num < ret->num)
|
|
ret = tp;
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct thread_info *
|
|
any_thread_of_process (int pid)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (ptid_get_pid (tp->ptid) == pid)
|
|
return tp;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct thread_info *
|
|
any_live_thread_of_process (int pid)
|
|
{
|
|
struct thread_info *tp;
|
|
struct thread_info *tp_running = NULL;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (ptid_get_pid (tp->ptid) == pid)
|
|
{
|
|
if (tp->state_ == THREAD_STOPPED)
|
|
return tp;
|
|
else if (tp->state_ == THREAD_RUNNING)
|
|
tp_running = tp;
|
|
}
|
|
|
|
return tp_running;
|
|
}
|
|
|
|
/* Print a list of thread ids currently known, and the total number of
|
|
threads. To be used from within catch_errors. */
|
|
static int
|
|
do_captured_list_thread_ids (struct ui_out *uiout, void *arg)
|
|
{
|
|
struct thread_info *tp;
|
|
int num = 0;
|
|
struct cleanup *cleanup_chain;
|
|
int current_thread = -1;
|
|
|
|
update_thread_list ();
|
|
|
|
cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
{
|
|
if (tp->state_ == THREAD_EXITED)
|
|
continue;
|
|
|
|
if (ptid_equal (tp->ptid, inferior_ptid))
|
|
current_thread = tp->num;
|
|
|
|
num++;
|
|
ui_out_field_int (uiout, "thread-id", tp->num);
|
|
}
|
|
|
|
do_cleanups (cleanup_chain);
|
|
|
|
if (current_thread != -1)
|
|
ui_out_field_int (uiout, "current-thread-id", current_thread);
|
|
ui_out_field_int (uiout, "number-of-threads", num);
|
|
return GDB_RC_OK;
|
|
}
|
|
|
|
/* Official gdblib interface function to get a list of thread ids and
|
|
the total number. */
|
|
enum gdb_rc
|
|
gdb_list_thread_ids (struct ui_out *uiout, char **error_message)
|
|
{
|
|
if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
|
|
error_message, RETURN_MASK_ALL) < 0)
|
|
return GDB_RC_FAIL;
|
|
return GDB_RC_OK;
|
|
}
|
|
|
|
/* Return true if TP is an active thread. */
|
|
static int
|
|
thread_alive (struct thread_info *tp)
|
|
{
|
|
if (tp->state_ == THREAD_EXITED)
|
|
return 0;
|
|
if (!target_thread_alive (tp->ptid))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
prune_threads (void)
|
|
{
|
|
struct thread_info *tp, *next;
|
|
|
|
for (tp = thread_list; tp; tp = next)
|
|
{
|
|
next = tp->next;
|
|
if (!thread_alive (tp))
|
|
delete_thread (tp->ptid);
|
|
}
|
|
}
|
|
|
|
void
|
|
thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid)
|
|
{
|
|
struct inferior *inf;
|
|
struct thread_info *tp;
|
|
|
|
/* It can happen that what we knew as the target inferior id
|
|
changes. E.g, target remote may only discover the remote process
|
|
pid after adding the inferior to GDB's list. */
|
|
inf = find_inferior_pid (ptid_get_pid (old_ptid));
|
|
inf->pid = ptid_get_pid (new_ptid);
|
|
|
|
tp = find_thread_ptid (old_ptid);
|
|
tp->ptid = new_ptid;
|
|
|
|
observer_notify_thread_ptid_changed (old_ptid, new_ptid);
|
|
}
|
|
|
|
void
|
|
set_running (ptid_t ptid, int running)
|
|
{
|
|
struct thread_info *tp;
|
|
int all = ptid_equal (ptid, minus_one_ptid);
|
|
|
|
/* We try not to notify the observer if no thread has actually changed
|
|
the running state -- merely to reduce the number of messages to
|
|
frontend. Frontend is supposed to handle multiple *running just fine. */
|
|
if (all || ptid_is_pid (ptid))
|
|
{
|
|
int any_started = 0;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
|
|
{
|
|
if (tp->state_ == THREAD_EXITED)
|
|
continue;
|
|
if (running && tp->state_ == THREAD_STOPPED)
|
|
any_started = 1;
|
|
tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
|
|
}
|
|
if (any_started)
|
|
observer_notify_target_resumed (ptid);
|
|
}
|
|
else
|
|
{
|
|
int started = 0;
|
|
|
|
tp = find_thread_ptid (ptid);
|
|
gdb_assert (tp);
|
|
gdb_assert (tp->state_ != THREAD_EXITED);
|
|
if (running && tp->state_ == THREAD_STOPPED)
|
|
started = 1;
|
|
tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
|
|
if (started)
|
|
observer_notify_target_resumed (ptid);
|
|
}
|
|
}
|
|
|
|
static int
|
|
is_thread_state (ptid_t ptid, enum thread_state state)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
tp = find_thread_ptid (ptid);
|
|
gdb_assert (tp);
|
|
return tp->state_ == state;
|
|
}
|
|
|
|
int
|
|
is_stopped (ptid_t ptid)
|
|
{
|
|
return is_thread_state (ptid, THREAD_STOPPED);
|
|
}
|
|
|
|
int
|
|
is_exited (ptid_t ptid)
|
|
{
|
|
return is_thread_state (ptid, THREAD_EXITED);
|
|
}
|
|
|
|
int
|
|
is_running (ptid_t ptid)
|
|
{
|
|
return is_thread_state (ptid, THREAD_RUNNING);
|
|
}
|
|
|
|
int
|
|
any_running (void)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (tp->state_ == THREAD_RUNNING)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
is_executing (ptid_t ptid)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
tp = find_thread_ptid (ptid);
|
|
gdb_assert (tp);
|
|
return tp->executing_;
|
|
}
|
|
|
|
void
|
|
set_executing (ptid_t ptid, int executing)
|
|
{
|
|
struct thread_info *tp;
|
|
int all = ptid_equal (ptid, minus_one_ptid);
|
|
|
|
if (all || ptid_is_pid (ptid))
|
|
{
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
|
|
tp->executing_ = executing;
|
|
}
|
|
else
|
|
{
|
|
tp = find_thread_ptid (ptid);
|
|
gdb_assert (tp);
|
|
tp->executing_ = executing;
|
|
}
|
|
}
|
|
|
|
void
|
|
set_stop_requested (ptid_t ptid, int stop)
|
|
{
|
|
struct thread_info *tp;
|
|
int all = ptid_equal (ptid, minus_one_ptid);
|
|
|
|
if (all || ptid_is_pid (ptid))
|
|
{
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
|
|
tp->stop_requested = stop;
|
|
}
|
|
else
|
|
{
|
|
tp = find_thread_ptid (ptid);
|
|
gdb_assert (tp);
|
|
tp->stop_requested = stop;
|
|
}
|
|
|
|
/* Call the stop requested observer so other components of GDB can
|
|
react to this request. */
|
|
if (stop)
|
|
observer_notify_thread_stop_requested (ptid);
|
|
}
|
|
|
|
void
|
|
finish_thread_state (ptid_t ptid)
|
|
{
|
|
struct thread_info *tp;
|
|
int all;
|
|
int any_started = 0;
|
|
|
|
all = ptid_equal (ptid, minus_one_ptid);
|
|
|
|
if (all || ptid_is_pid (ptid))
|
|
{
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
{
|
|
if (tp->state_ == THREAD_EXITED)
|
|
continue;
|
|
if (all || ptid_get_pid (ptid) == ptid_get_pid (tp->ptid))
|
|
{
|
|
if (tp->executing_ && tp->state_ == THREAD_STOPPED)
|
|
any_started = 1;
|
|
tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tp = find_thread_ptid (ptid);
|
|
gdb_assert (tp);
|
|
if (tp->state_ != THREAD_EXITED)
|
|
{
|
|
if (tp->executing_ && tp->state_ == THREAD_STOPPED)
|
|
any_started = 1;
|
|
tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
|
|
}
|
|
}
|
|
|
|
if (any_started)
|
|
observer_notify_target_resumed (ptid);
|
|
}
|
|
|
|
void
|
|
finish_thread_state_cleanup (void *arg)
|
|
{
|
|
ptid_t *ptid_p = arg;
|
|
|
|
gdb_assert (arg);
|
|
|
|
finish_thread_state (*ptid_p);
|
|
}
|
|
|
|
/* Prints the list of threads and their details on UIOUT.
|
|
This is a version of 'info_thread_command' suitable for
|
|
use from MI.
|
|
If REQUESTED_THREAD is not -1, it's the GDB id of the thread
|
|
that should be printed. Otherwise, all threads are
|
|
printed.
|
|
If PID is not -1, only print threads from the process PID.
|
|
Otherwise, threads from all attached PIDs are printed.
|
|
If both REQUESTED_THREAD and PID are not -1, then the thread
|
|
is printed if it belongs to the specified process. Otherwise,
|
|
an error is raised. */
|
|
void
|
|
print_thread_info (struct ui_out *uiout, int requested_thread, int pid)
|
|
{
|
|
struct thread_info *tp;
|
|
ptid_t current_ptid;
|
|
struct cleanup *old_chain;
|
|
char *extra_info;
|
|
int current_thread = -1;
|
|
|
|
update_thread_list ();
|
|
current_ptid = inferior_ptid;
|
|
|
|
/* We'll be switching threads temporarily. */
|
|
old_chain = make_cleanup_restore_current_thread ();
|
|
|
|
/* For backward compatibility, we make a list for MI. A table is
|
|
preferable for the CLI, though, because it shows table
|
|
headers. */
|
|
if (ui_out_is_mi_like_p (uiout))
|
|
make_cleanup_ui_out_list_begin_end (uiout, "threads");
|
|
else
|
|
{
|
|
int n_threads = 0;
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
{
|
|
if (requested_thread != -1 && tp->num != requested_thread)
|
|
continue;
|
|
|
|
if (pid != -1 && PIDGET (tp->ptid) != pid)
|
|
continue;
|
|
|
|
if (tp->state_ == THREAD_EXITED)
|
|
continue;
|
|
|
|
++n_threads;
|
|
}
|
|
|
|
if (n_threads == 0)
|
|
{
|
|
if (requested_thread == -1)
|
|
ui_out_message (uiout, 0, _("No threads.\n"));
|
|
else
|
|
ui_out_message (uiout, 0, _("No thread %d.\n"), requested_thread);
|
|
do_cleanups (old_chain);
|
|
return;
|
|
}
|
|
|
|
make_cleanup_ui_out_table_begin_end (uiout, 5, n_threads, "threads");
|
|
|
|
ui_out_table_header (uiout, 1, ui_left, "current", "");
|
|
ui_out_table_header (uiout, 4, ui_left, "id", "Id");
|
|
ui_out_table_header (uiout, 17, ui_left, "target-id", "Target Id");
|
|
ui_out_table_header (uiout, 1, ui_noalign, "details", "");
|
|
ui_out_table_header (uiout, 1, ui_left, "frame", "Frame");
|
|
ui_out_table_body (uiout);
|
|
}
|
|
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
{
|
|
struct cleanup *chain2;
|
|
int core;
|
|
|
|
if (requested_thread != -1 && tp->num != requested_thread)
|
|
continue;
|
|
|
|
if (pid != -1 && PIDGET (tp->ptid) != pid)
|
|
{
|
|
if (requested_thread != -1)
|
|
error (_("Requested thread not found in requested process"));
|
|
continue;
|
|
}
|
|
|
|
if (ptid_equal (tp->ptid, current_ptid))
|
|
current_thread = tp->num;
|
|
|
|
if (tp->state_ == THREAD_EXITED)
|
|
continue;
|
|
|
|
chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
|
|
|
|
if (ui_out_is_mi_like_p (uiout))
|
|
{
|
|
/* Compatibility. */
|
|
if (ptid_equal (tp->ptid, current_ptid))
|
|
ui_out_text (uiout, "* ");
|
|
else
|
|
ui_out_text (uiout, " ");
|
|
}
|
|
else
|
|
{
|
|
if (ptid_equal (tp->ptid, current_ptid))
|
|
ui_out_field_string (uiout, "current", "*");
|
|
else
|
|
ui_out_field_skip (uiout, "current");
|
|
}
|
|
|
|
ui_out_field_int (uiout, "id", tp->num);
|
|
ui_out_field_string (uiout, "target-id", target_pid_to_str (tp->ptid));
|
|
|
|
extra_info = target_extra_thread_info (tp);
|
|
if (extra_info)
|
|
{
|
|
ui_out_text (uiout, " (");
|
|
ui_out_field_string (uiout, "details", extra_info);
|
|
ui_out_text (uiout, ")");
|
|
}
|
|
else if (! ui_out_is_mi_like_p (uiout))
|
|
ui_out_field_skip (uiout, "details");
|
|
|
|
if (tp->state_ == THREAD_RUNNING)
|
|
ui_out_text (uiout, "(running)\n");
|
|
else
|
|
{
|
|
/* The switch below puts us at the top of the stack (leaf
|
|
frame). */
|
|
switch_to_thread (tp->ptid);
|
|
print_stack_frame (get_selected_frame (NULL),
|
|
/* For MI output, print frame level. */
|
|
ui_out_is_mi_like_p (uiout),
|
|
LOCATION);
|
|
}
|
|
|
|
if (ui_out_is_mi_like_p (uiout))
|
|
{
|
|
char *state = "stopped";
|
|
|
|
if (tp->state_ == THREAD_RUNNING)
|
|
state = "running";
|
|
ui_out_field_string (uiout, "state", state);
|
|
}
|
|
|
|
core = target_core_of_thread (tp->ptid);
|
|
if (ui_out_is_mi_like_p (uiout) && core != -1)
|
|
ui_out_field_int (uiout, "core", core);
|
|
|
|
do_cleanups (chain2);
|
|
}
|
|
|
|
/* Restores the current thread and the frame selected before
|
|
the "info threads" command. */
|
|
do_cleanups (old_chain);
|
|
|
|
if (pid == -1 && requested_thread == -1)
|
|
{
|
|
gdb_assert (current_thread != -1
|
|
|| !thread_list
|
|
|| ptid_equal (inferior_ptid, null_ptid));
|
|
if (current_thread != -1 && ui_out_is_mi_like_p (uiout))
|
|
ui_out_field_int (uiout, "current-thread-id", current_thread);
|
|
|
|
if (current_thread != -1 && is_exited (current_ptid))
|
|
ui_out_message (uiout, 0, "\n\
|
|
The current thread <Thread ID %d> has terminated. See `help thread'.\n",
|
|
current_thread);
|
|
else if (thread_list
|
|
&& current_thread == -1
|
|
&& ptid_equal (current_ptid, null_ptid))
|
|
ui_out_message (uiout, 0, "\n\
|
|
No selected thread. See `help thread'.\n");
|
|
}
|
|
}
|
|
|
|
|
|
/* Print information about currently known threads
|
|
|
|
* Note: this has the drawback that it _really_ switches
|
|
* threads, which frees the frame cache. A no-side
|
|
* effects info-threads command would be nicer.
|
|
*/
|
|
|
|
static void
|
|
info_threads_command (char *arg, int from_tty)
|
|
{
|
|
print_thread_info (uiout, -1, -1);
|
|
}
|
|
|
|
/* Switch from one thread to another. */
|
|
|
|
void
|
|
switch_to_thread (ptid_t ptid)
|
|
{
|
|
/* Switch the program space as well, if we can infer it from the now
|
|
current thread. Otherwise, it's up to the caller to select the
|
|
space it wants. */
|
|
if (!ptid_equal (ptid, null_ptid))
|
|
{
|
|
struct inferior *inf;
|
|
|
|
inf = find_inferior_pid (ptid_get_pid (ptid));
|
|
gdb_assert (inf != NULL);
|
|
set_current_program_space (inf->pspace);
|
|
set_current_inferior (inf);
|
|
}
|
|
|
|
if (ptid_equal (ptid, inferior_ptid))
|
|
return;
|
|
|
|
inferior_ptid = ptid;
|
|
reinit_frame_cache ();
|
|
registers_changed ();
|
|
|
|
/* We don't check for is_stopped, because we're called at times
|
|
while in the TARGET_RUNNING state, e.g., while handling an
|
|
internal event. */
|
|
if (!ptid_equal (inferior_ptid, null_ptid)
|
|
&& !is_exited (ptid)
|
|
&& !is_executing (ptid))
|
|
stop_pc = regcache_read_pc (get_thread_regcache (ptid));
|
|
else
|
|
stop_pc = ~(CORE_ADDR) 0;
|
|
}
|
|
|
|
static void
|
|
restore_current_thread (ptid_t ptid)
|
|
{
|
|
switch_to_thread (ptid);
|
|
}
|
|
|
|
static void
|
|
restore_selected_frame (struct frame_id a_frame_id, int frame_level)
|
|
{
|
|
struct frame_info *frame = NULL;
|
|
int count;
|
|
|
|
gdb_assert (frame_level >= 0);
|
|
|
|
/* Restore by level first, check if the frame id is the same as
|
|
expected. If that fails, try restoring by frame id. If that
|
|
fails, nothing to do, just warn the user. */
|
|
|
|
count = frame_level;
|
|
frame = find_relative_frame (get_current_frame (), &count);
|
|
if (count == 0
|
|
&& frame != NULL
|
|
/* The frame ids must match - either both valid or both outer_frame_id.
|
|
The latter case is not failsafe, but since it's highly unlikely
|
|
the search by level finds the wrong frame, it's 99.9(9)% of
|
|
the time (for all practical purposes) safe. */
|
|
&& frame_id_eq (get_frame_id (frame), a_frame_id))
|
|
{
|
|
/* Cool, all is fine. */
|
|
select_frame (frame);
|
|
return;
|
|
}
|
|
|
|
frame = frame_find_by_id (a_frame_id);
|
|
if (frame != NULL)
|
|
{
|
|
/* Cool, refound it. */
|
|
select_frame (frame);
|
|
return;
|
|
}
|
|
|
|
/* Nothing else to do, the frame layout really changed. Select the
|
|
innermost stack frame. */
|
|
select_frame (get_current_frame ());
|
|
|
|
/* Warn the user. */
|
|
if (frame_level > 0 && !ui_out_is_mi_like_p (uiout))
|
|
{
|
|
warning (_("Couldn't restore frame #%d in "
|
|
"current thread, at reparsed frame #0\n"),
|
|
frame_level);
|
|
/* For MI, we should probably have a notification about
|
|
current frame change. But this error is not very
|
|
likely, so don't bother for now. */
|
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_LINE);
|
|
}
|
|
}
|
|
|
|
struct current_thread_cleanup
|
|
{
|
|
ptid_t inferior_ptid;
|
|
struct frame_id selected_frame_id;
|
|
int selected_frame_level;
|
|
int was_stopped;
|
|
int inf_id;
|
|
};
|
|
|
|
static void
|
|
do_restore_current_thread_cleanup (void *arg)
|
|
{
|
|
struct thread_info *tp;
|
|
struct current_thread_cleanup *old = arg;
|
|
|
|
tp = find_thread_ptid (old->inferior_ptid);
|
|
|
|
/* If the previously selected thread belonged to a process that has
|
|
in the mean time been deleted (due to normal exit, detach, etc.),
|
|
then don't revert back to it, but instead simply drop back to no
|
|
thread selected. */
|
|
if (tp
|
|
&& find_inferior_pid (ptid_get_pid (tp->ptid)) != NULL)
|
|
restore_current_thread (old->inferior_ptid);
|
|
else
|
|
{
|
|
restore_current_thread (null_ptid);
|
|
set_current_inferior (find_inferior_id (old->inf_id));
|
|
}
|
|
|
|
/* The running state of the originally selected thread may have
|
|
changed, so we have to recheck it here. */
|
|
if (!ptid_equal (inferior_ptid, null_ptid)
|
|
&& old->was_stopped
|
|
&& is_stopped (inferior_ptid)
|
|
&& target_has_registers
|
|
&& target_has_stack
|
|
&& target_has_memory)
|
|
restore_selected_frame (old->selected_frame_id,
|
|
old->selected_frame_level);
|
|
}
|
|
|
|
static void
|
|
restore_current_thread_cleanup_dtor (void *arg)
|
|
{
|
|
struct current_thread_cleanup *old = arg;
|
|
struct thread_info *tp;
|
|
|
|
tp = find_thread_ptid (old->inferior_ptid);
|
|
if (tp)
|
|
tp->refcount--;
|
|
xfree (old);
|
|
}
|
|
|
|
struct cleanup *
|
|
make_cleanup_restore_current_thread (void)
|
|
{
|
|
struct thread_info *tp;
|
|
struct frame_info *frame;
|
|
struct current_thread_cleanup *old;
|
|
|
|
old = xmalloc (sizeof (struct current_thread_cleanup));
|
|
old->inferior_ptid = inferior_ptid;
|
|
old->inf_id = current_inferior ()->num;
|
|
|
|
if (!ptid_equal (inferior_ptid, null_ptid))
|
|
{
|
|
old->was_stopped = is_stopped (inferior_ptid);
|
|
if (old->was_stopped
|
|
&& target_has_registers
|
|
&& target_has_stack
|
|
&& target_has_memory)
|
|
frame = get_selected_frame (NULL);
|
|
else
|
|
frame = NULL;
|
|
|
|
old->selected_frame_id = get_frame_id (frame);
|
|
old->selected_frame_level = frame_relative_level (frame);
|
|
|
|
tp = find_thread_ptid (inferior_ptid);
|
|
if (tp)
|
|
tp->refcount++;
|
|
}
|
|
|
|
return make_cleanup_dtor (do_restore_current_thread_cleanup, old,
|
|
restore_current_thread_cleanup_dtor);
|
|
}
|
|
|
|
/* Apply a GDB command to a list of threads. List syntax is a whitespace
|
|
seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
|
|
of two numbers seperated by a hyphen. Examples:
|
|
|
|
thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
|
|
thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
|
|
thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
|
|
|
|
static void
|
|
thread_apply_all_command (char *cmd, int from_tty)
|
|
{
|
|
struct thread_info *tp;
|
|
struct cleanup *old_chain;
|
|
char *saved_cmd;
|
|
|
|
if (cmd == NULL || *cmd == '\000')
|
|
error (_("Please specify a command following the thread ID list"));
|
|
|
|
update_thread_list ();
|
|
|
|
old_chain = make_cleanup_restore_current_thread ();
|
|
|
|
/* Save a copy of the command in case it is clobbered by
|
|
execute_command. */
|
|
saved_cmd = xstrdup (cmd);
|
|
make_cleanup (xfree, saved_cmd);
|
|
for (tp = thread_list; tp; tp = tp->next)
|
|
if (thread_alive (tp))
|
|
{
|
|
switch_to_thread (tp->ptid);
|
|
|
|
printf_filtered (_("\nThread %d (%s):\n"),
|
|
tp->num, target_pid_to_str (inferior_ptid));
|
|
execute_command (cmd, from_tty);
|
|
strcpy (cmd, saved_cmd); /* Restore exact command used
|
|
previously. */
|
|
}
|
|
|
|
do_cleanups (old_chain);
|
|
}
|
|
|
|
static void
|
|
thread_apply_command (char *tidlist, int from_tty)
|
|
{
|
|
char *cmd;
|
|
char *p;
|
|
struct cleanup *old_chain;
|
|
char *saved_cmd;
|
|
|
|
if (tidlist == NULL || *tidlist == '\000')
|
|
error (_("Please specify a thread ID list"));
|
|
|
|
for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
|
|
|
|
if (*cmd == '\000')
|
|
error (_("Please specify a command following the thread ID list"));
|
|
|
|
/* Save a copy of the command in case it is clobbered by
|
|
execute_command. */
|
|
saved_cmd = xstrdup (cmd);
|
|
old_chain = make_cleanup (xfree, saved_cmd);
|
|
while (tidlist < cmd)
|
|
{
|
|
struct thread_info *tp;
|
|
int start, end;
|
|
|
|
start = strtol (tidlist, &p, 10);
|
|
if (p == tidlist)
|
|
error (_("Error parsing %s"), tidlist);
|
|
tidlist = p;
|
|
|
|
while (*tidlist == ' ' || *tidlist == '\t')
|
|
tidlist++;
|
|
|
|
if (*tidlist == '-') /* Got a range of IDs? */
|
|
{
|
|
tidlist++; /* Skip the - */
|
|
end = strtol (tidlist, &p, 10);
|
|
if (p == tidlist)
|
|
error (_("Error parsing %s"), tidlist);
|
|
tidlist = p;
|
|
|
|
while (*tidlist == ' ' || *tidlist == '\t')
|
|
tidlist++;
|
|
}
|
|
else
|
|
end = start;
|
|
|
|
make_cleanup_restore_current_thread ();
|
|
|
|
for (; start <= end; start++)
|
|
{
|
|
tp = find_thread_id (start);
|
|
|
|
if (!tp)
|
|
warning (_("Unknown thread %d."), start);
|
|
else if (!thread_alive (tp))
|
|
warning (_("Thread %d has terminated."), start);
|
|
else
|
|
{
|
|
switch_to_thread (tp->ptid);
|
|
|
|
printf_filtered (_("\nThread %d (%s):\n"), tp->num,
|
|
target_pid_to_str (inferior_ptid));
|
|
execute_command (cmd, from_tty);
|
|
|
|
/* Restore exact command used previously. */
|
|
strcpy (cmd, saved_cmd);
|
|
}
|
|
}
|
|
}
|
|
|
|
do_cleanups (old_chain);
|
|
}
|
|
|
|
/* Switch to the specified thread. Will dispatch off to thread_apply_command
|
|
if prefix of arg is `apply'. */
|
|
|
|
static void
|
|
thread_command (char *tidstr, int from_tty)
|
|
{
|
|
if (!tidstr)
|
|
{
|
|
if (ptid_equal (inferior_ptid, null_ptid))
|
|
error (_("No thread selected"));
|
|
|
|
if (target_has_stack)
|
|
{
|
|
if (is_exited (inferior_ptid))
|
|
printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
|
|
pid_to_thread_id (inferior_ptid),
|
|
target_pid_to_str (inferior_ptid));
|
|
else
|
|
printf_filtered (_("[Current thread is %d (%s)]\n"),
|
|
pid_to_thread_id (inferior_ptid),
|
|
target_pid_to_str (inferior_ptid));
|
|
}
|
|
else
|
|
error (_("No stack."));
|
|
return;
|
|
}
|
|
|
|
gdb_thread_select (uiout, tidstr, NULL);
|
|
}
|
|
|
|
/* Print notices when new threads are attached and detached. */
|
|
int print_thread_events = 1;
|
|
static void
|
|
show_print_thread_events (struct ui_file *file, int from_tty,
|
|
struct cmd_list_element *c, const char *value)
|
|
{
|
|
fprintf_filtered (file,
|
|
_("Printing of thread events is %s.\n"),
|
|
value);
|
|
}
|
|
|
|
static int
|
|
do_captured_thread_select (struct ui_out *uiout, void *tidstr)
|
|
{
|
|
int num;
|
|
struct thread_info *tp;
|
|
|
|
num = value_as_long (parse_and_eval (tidstr));
|
|
|
|
tp = find_thread_id (num);
|
|
|
|
if (!tp)
|
|
error (_("Thread ID %d not known."), num);
|
|
|
|
if (!thread_alive (tp))
|
|
error (_("Thread ID %d has terminated."), num);
|
|
|
|
switch_to_thread (tp->ptid);
|
|
|
|
annotate_thread_changed ();
|
|
|
|
ui_out_text (uiout, "[Switching to thread ");
|
|
ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
|
|
ui_out_text (uiout, " (");
|
|
ui_out_text (uiout, target_pid_to_str (inferior_ptid));
|
|
ui_out_text (uiout, ")]");
|
|
|
|
/* Note that we can't reach this with an exited thread, due to the
|
|
thread_alive check above. */
|
|
if (tp->state_ == THREAD_RUNNING)
|
|
ui_out_text (uiout, "(running)\n");
|
|
else
|
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
|
|
|
|
/* Since the current thread may have changed, see if there is any
|
|
exited thread we can now delete. */
|
|
prune_threads ();
|
|
|
|
return GDB_RC_OK;
|
|
}
|
|
|
|
enum gdb_rc
|
|
gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
|
|
{
|
|
if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
|
|
error_message, RETURN_MASK_ALL) < 0)
|
|
return GDB_RC_FAIL;
|
|
return GDB_RC_OK;
|
|
}
|
|
|
|
void
|
|
update_thread_list (void)
|
|
{
|
|
prune_threads ();
|
|
target_find_new_threads ();
|
|
}
|
|
|
|
/* Return a new value for the selected thread's id. Return a value of 0 if
|
|
no thread is selected, or no threads exist. */
|
|
|
|
static struct value *
|
|
thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var)
|
|
{
|
|
struct thread_info *tp = find_thread_ptid (inferior_ptid);
|
|
|
|
return value_from_longest (builtin_type (gdbarch)->builtin_int,
|
|
(tp ? tp->num : 0));
|
|
}
|
|
|
|
/* Commands with a prefix of `thread'. */
|
|
struct cmd_list_element *thread_cmd_list = NULL;
|
|
|
|
void
|
|
_initialize_thread (void)
|
|
{
|
|
static struct cmd_list_element *thread_apply_list = NULL;
|
|
|
|
add_info ("threads", info_threads_command,
|
|
_("IDs of currently known threads."));
|
|
|
|
add_prefix_cmd ("thread", class_run, thread_command, _("\
|
|
Use this command to switch between threads.\n\
|
|
The new thread ID must be currently known."),
|
|
&thread_cmd_list, "thread ", 1, &cmdlist);
|
|
|
|
add_prefix_cmd ("apply", class_run, thread_apply_command,
|
|
_("Apply a command to a list of threads."),
|
|
&thread_apply_list, "thread apply ", 1, &thread_cmd_list);
|
|
|
|
add_cmd ("all", class_run, thread_apply_all_command,
|
|
_("Apply a command to all threads."), &thread_apply_list);
|
|
|
|
if (!xdb_commands)
|
|
add_com_alias ("t", "thread", class_run, 1);
|
|
|
|
add_setshow_boolean_cmd ("thread-events", no_class,
|
|
&print_thread_events, _("\
|
|
Set printing of thread events (such as thread start and exit)."), _("\
|
|
Show printing of thread events (such as thread start and exit)."), NULL,
|
|
NULL,
|
|
show_print_thread_events,
|
|
&setprintlist, &showprintlist);
|
|
|
|
create_internalvar_type_lazy ("_thread", thread_id_make_value);
|
|
}
|