| /* Multi-process/thread control for GDB, the GNU debugger. |
| |
| Copyright (C) 1986-2014 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 <string.h> |
| #include "btrace.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" |
| #include "gdb_regex.h" |
| #include "cli/cli-utils.h" |
| #include "continuations.h" |
| |
| /* Definition of struct thread_info exported to gdbthread.h. */ |
| |
| /* Prototypes for exported functions. */ |
| |
| void _initialize_thread (void); |
| |
| /* Prototypes for local functions. */ |
| |
| 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); |
| |
| /* Data to cleanup thread array. */ |
| |
| struct thread_array_cleanup |
| { |
| /* Array of thread pointers used to set |
| reference count. */ |
| struct thread_info **tp_array; |
| |
| /* Thread count in the array. */ |
| int count; |
| }; |
| |
| |
| 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; |
| } |
| |
| delete_longjmp_breakpoint_at_next_stop (tp->num); |
| |
| bpstat_clear (&tp->control.stop_bpstat); |
| |
| btrace_teardown (tp); |
| |
| do_all_intermediate_continuations_thread (tp, 1); |
| do_all_continuations_thread (tp, 1); |
| } |
| |
| static void |
| free_thread (struct thread_info *tp) |
| { |
| if (tp->private) |
| { |
| if (tp->private_dtor) |
| tp->private_dtor (tp->private); |
| else |
| xfree (tp->private); |
| } |
| |
| xfree (tp->name); |
| 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; |
| } |
| |
| /* Notify thread exit, but only if we haven't already. */ |
| if (tp->state != THREAD_EXITED) |
| observer_notify_thread_exit (tp, silent); |
| |
| /* Tag it as exited. */ |
| tp->state = THREAD_EXITED; |
| clear_thread_inferior_resources (tp); |
| |
| if (tpprev) |
| tpprev->next = tp->next; |
| else |
| thread_list = tp->next; |
| |
| 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_executing = NULL; |
| |
| for (tp = thread_list; tp; tp = tp->next) |
| if (tp->state != THREAD_EXITED && ptid_get_pid (tp->ptid) == pid) |
| { |
| if (tp->executing) |
| tp_executing = tp; |
| else |
| return tp; |
| } |
| |
| return tp_executing; |
| } |
| |
| /* 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); |
| } |
| |
| int |
| pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread) |
| { |
| return (pc >= thread->control.step_range_start |
| && pc < thread->control.step_range_end); |
| } |
| |
| /* Prints the list of threads and their details on UIOUT. |
| This is a version of 'info_threads_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, char *requested_threads, int pid) |
| { |
| struct thread_info *tp; |
| ptid_t current_ptid; |
| struct cleanup *old_chain; |
| char *extra_info, *name, *target_id; |
| 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 (!number_is_in_list (requested_threads, tp->num)) |
| continue; |
| |
| if (pid != -1 && ptid_get_pid (tp->ptid) != pid) |
| continue; |
| |
| if (tp->state == THREAD_EXITED) |
| continue; |
| |
| ++n_threads; |
| } |
| |
| if (n_threads == 0) |
| { |
| if (requested_threads == NULL || *requested_threads == '\0') |
| ui_out_message (uiout, 0, _("No threads.\n")); |
| else |
| ui_out_message (uiout, 0, _("No threads match '%s'.\n"), |
| requested_threads); |
| do_cleanups (old_chain); |
| return; |
| } |
| |
| make_cleanup_ui_out_table_begin_end (uiout, 4, 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_left, "frame", "Frame"); |
| ui_out_table_body (uiout); |
| } |
| |
| for (tp = thread_list; tp; tp = tp->next) |
| { |
| struct cleanup *chain2; |
| int core; |
| |
| if (!number_is_in_list (requested_threads, tp->num)) |
| continue; |
| |
| if (pid != -1 && ptid_get_pid (tp->ptid) != pid) |
| { |
| if (requested_threads != NULL && *requested_threads != '\0') |
| 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); |
| |
| /* For the CLI, we stuff everything into the target-id field. |
| This is a gross hack to make the output come out looking |
| correct. The underlying problem here is that ui-out has no |
| way to specify that a field's space allocation should be |
| shared by several fields. For MI, we do the right thing |
| instead. */ |
| |
| target_id = target_pid_to_str (tp->ptid); |
| extra_info = target_extra_thread_info (tp); |
| name = tp->name ? tp->name : target_thread_name (tp); |
| |
| if (ui_out_is_mi_like_p (uiout)) |
| { |
| ui_out_field_string (uiout, "target-id", target_id); |
| if (extra_info) |
| ui_out_field_string (uiout, "details", extra_info); |
| if (name) |
| ui_out_field_string (uiout, "name", name); |
| } |
| else |
| { |
| struct cleanup *str_cleanup; |
| char *contents; |
| |
| if (extra_info && name) |
| contents = xstrprintf ("%s \"%s\" (%s)", target_id, |
| name, extra_info); |
| else if (extra_info) |
| contents = xstrprintf ("%s (%s)", target_id, extra_info); |
| else if (name) |
| contents = xstrprintf ("%s \"%s\"", target_id, name); |
| else |
| contents = xstrdup (target_id); |
| str_cleanup = make_cleanup (xfree, contents); |
| |
| ui_out_field_string (uiout, "target-id", contents); |
| do_cleanups (str_cleanup); |
| } |
| |
| 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, 0); |
| } |
| |
| 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_threads == NULL) |
| { |
| 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 |
| |
| Optional ARG is a thread id, or list of thread ids. |
| |
| 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 (current_uiout, arg, -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 (); |
| |
| /* 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; |
| |
| /* This means there was no selected frame. */ |
| if (frame_level == -1) |
| { |
| select_frame (NULL); |
| return; |
| } |
| |
| 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 (current_uiout)) |
| { |
| warning (_("Couldn't restore frame #%d in " |
| "current thread. Bottom (innermost) frame selected:"), |
| 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_AND_LOC, 1); |
| } |
| } |
| |
| struct current_thread_cleanup |
| { |
| ptid_t inferior_ptid; |
| struct frame_id selected_frame_id; |
| int selected_frame_level; |
| int was_stopped; |
| int inf_id; |
| int was_removable; |
| }; |
| |
| 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; |
| struct inferior *inf; |
| |
| tp = find_thread_ptid (old->inferior_ptid); |
| if (tp) |
| tp->refcount--; |
| inf = find_inferior_id (old->inf_id); |
| if (inf != NULL) |
| inf->removable = old->was_removable; |
| xfree (old); |
| } |
| |
| /* Set the thread reference count. */ |
| |
| static void |
| set_thread_refcount (void *data) |
| { |
| int k; |
| struct thread_array_cleanup *ta_cleanup = data; |
| |
| for (k = 0; k != ta_cleanup->count; k++) |
| ta_cleanup->tp_array[k]->refcount--; |
| } |
| |
| 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; |
| old->was_removable = current_inferior ()->removable; |
| |
| 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) |
| { |
| /* When processing internal events, there might not be a |
| selected frame. If we naively call get_selected_frame |
| here, then we can end up reading debuginfo for the |
| current frame, but we don't generally need the debuginfo |
| at this point. */ |
| frame = get_selected_frame_if_set (); |
| } |
| 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++; |
| } |
| |
| current_inferior ()->removable = 0; |
| |
| 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 cleanup *old_chain; |
| char *saved_cmd; |
| int tc; |
| struct thread_array_cleanup ta_cleanup; |
| |
| 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); |
| tc = thread_count (); |
| |
| if (tc) |
| { |
| struct thread_info **tp_array; |
| struct thread_info *tp; |
| int i = 0, k; |
| |
| /* Save a copy of the thread_list in case we execute detach |
| command. */ |
| tp_array = xmalloc (sizeof (struct thread_info *) * tc); |
| make_cleanup (xfree, tp_array); |
| ta_cleanup.tp_array = tp_array; |
| ta_cleanup.count = tc; |
| |
| ALL_THREADS (tp) |
| { |
| tp_array[i] = tp; |
| tp->refcount++; |
| i++; |
| } |
| |
| make_cleanup (set_thread_refcount, &ta_cleanup); |
| |
| for (k = 0; k != i; k++) |
| if (thread_alive (tp_array[k])) |
| { |
| switch_to_thread (tp_array[k]->ptid); |
| printf_filtered (_("\nThread %d (%s):\n"), |
| tp_array[k]->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); |
| } |
| |
| static void |
| thread_apply_command (char *tidlist, int from_tty) |
| { |
| char *cmd; |
| struct cleanup *old_chain; |
| char *saved_cmd; |
| struct get_number_or_range_state state; |
| |
| 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); |
| |
| init_number_or_range (&state, tidlist); |
| while (!state.finished && state.string < cmd) |
| { |
| struct thread_info *tp; |
| int start; |
| |
| start = get_number_or_range (&state); |
| |
| make_cleanup_restore_current_thread (); |
| |
| 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 (current_uiout, tidstr, NULL); |
| } |
| |
| /* Implementation of `thread name'. */ |
| |
| static void |
| thread_name_command (char *arg, int from_tty) |
| { |
| struct thread_info *info; |
| |
| if (ptid_equal (inferior_ptid, null_ptid)) |
| error (_("No thread selected")); |
| |
| arg = skip_spaces (arg); |
| |
| info = inferior_thread (); |
| xfree (info->name); |
| info->name = arg ? xstrdup (arg) : NULL; |
| } |
| |
| /* Find thread ids with a name, target pid, or extra info matching ARG. */ |
| |
| static void |
| thread_find_command (char *arg, int from_tty) |
| { |
| struct thread_info *tp; |
| char *tmp; |
| unsigned long match = 0; |
| |
| if (arg == NULL || *arg == '\0') |
| error (_("Command requires an argument.")); |
| |
| tmp = re_comp (arg); |
| if (tmp != 0) |
| error (_("Invalid regexp (%s): %s"), tmp, arg); |
| |
| update_thread_list (); |
| for (tp = thread_list; tp; tp = tp->next) |
| { |
| if (tp->name != NULL && re_exec (tp->name)) |
| { |
| printf_filtered (_("Thread %d has name '%s'\n"), |
| tp->num, tp->name); |
| match++; |
| } |
| |
| tmp = target_thread_name (tp); |
| if (tmp != NULL && re_exec (tmp)) |
| { |
| printf_filtered (_("Thread %d has target name '%s'\n"), |
| tp->num, tmp); |
| match++; |
| } |
| |
| tmp = target_pid_to_str (tp->ptid); |
| if (tmp != NULL && re_exec (tmp)) |
| { |
| printf_filtered (_("Thread %d has target id '%s'\n"), |
| tp->num, tmp); |
| match++; |
| } |
| |
| tmp = target_extra_thread_info (tp); |
| if (tmp != NULL && re_exec (tmp)) |
| { |
| printf_filtered (_("Thread %d has extra info '%s'\n"), |
| tp->num, tmp); |
| match++; |
| } |
| } |
| if (!match) |
| printf_filtered (_("No threads match '%s'\n"), arg); |
| } |
| |
| /* 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 |
| { |
| ui_out_text (uiout, "\n"); |
| print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); |
| } |
| |
| /* 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, |
| void *ignore) |
| { |
| 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; |
| |
| /* Implementation of `thread' variable. */ |
| |
| static const struct internalvar_funcs thread_funcs = |
| { |
| thread_id_make_value, |
| NULL, |
| NULL |
| }; |
| |
| void |
| _initialize_thread (void) |
| { |
| static struct cmd_list_element *thread_apply_list = NULL; |
| |
| add_info ("threads", info_threads_command, |
| _("Display currently known threads.\n\ |
| Usage: info threads [ID]...\n\ |
| Optional arguments are thread IDs with spaces between.\n\ |
| If no arguments, all threads are displayed.")); |
| |
| 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); |
| |
| add_cmd ("name", class_run, thread_name_command, |
| _("Set the current thread's name.\n\ |
| Usage: thread name [NAME]\n\ |
| If NAME is not given, then any existing name is removed."), &thread_cmd_list); |
| |
| add_cmd ("find", class_run, thread_find_command, _("\ |
| Find threads that match a regular expression.\n\ |
| Usage: thread find REGEXP\n\ |
| Will display thread ids whose name, target ID, or extra info matches REGEXP."), |
| &thread_cmd_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_funcs, NULL); |
| } |