| /* Multi-process/thread control for GDB, the GNU debugger. |
| |
| Copyright (C) 1986-2017 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 "command.h" |
| #include "gdbcmd.h" |
| #include "regcache.h" |
| #include "gdb.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 "thread-fsm.h" |
| #include "tid-parse.h" |
| #include "user-selection.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; |
| |
| /* True if any thread is, or may be executing. We need to track this |
| separately because until we fully sync the thread list, we won't |
| know whether the target is fully stopped, even if we see stop |
| events for all known threads, because any of those threads may have |
| spawned new threads we haven't heard of yet. */ |
| static int threads_executing; |
| |
| 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); |
| |
| /* 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; |
| } |
| |
| /* Delete the breakpoint pointed at by BP_P, if there's one. */ |
| |
| static void |
| delete_thread_breakpoint (struct breakpoint **bp_p) |
| { |
| if (*bp_p != NULL) |
| { |
| delete_breakpoint (*bp_p); |
| *bp_p = NULL; |
| } |
| } |
| |
| void |
| delete_step_resume_breakpoint (struct thread_info *tp) |
| { |
| if (tp != NULL) |
| delete_thread_breakpoint (&tp->control.step_resume_breakpoint); |
| } |
| |
| void |
| delete_exception_resume_breakpoint (struct thread_info *tp) |
| { |
| if (tp != NULL) |
| delete_thread_breakpoint (&tp->control.exception_resume_breakpoint); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| delete_single_step_breakpoints (struct thread_info *tp) |
| { |
| if (tp != NULL) |
| delete_thread_breakpoint (&tp->control.single_step_breakpoints); |
| } |
| |
| /* Delete the breakpoint pointed at by BP_P at the next stop, if |
| there's one. */ |
| |
| static void |
| delete_at_next_stop (struct breakpoint **bp) |
| { |
| if (*bp != NULL) |
| { |
| (*bp)->disposition = disp_del_at_next_stop; |
| *bp = NULL; |
| } |
| } |
| |
| /* See gdbthread.h. */ |
| |
| int |
| thread_has_single_step_breakpoints_set (struct thread_info *tp) |
| { |
| return tp->control.single_step_breakpoints != NULL; |
| } |
| |
| /* See gdbthread.h. */ |
| |
| int |
| thread_has_single_step_breakpoint_here (struct thread_info *tp, |
| struct address_space *aspace, |
| CORE_ADDR addr) |
| { |
| struct breakpoint *ss_bps = tp->control.single_step_breakpoints; |
| |
| return (ss_bps != NULL |
| && breakpoint_has_location_inserted_here (ss_bps, aspace, addr)); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| thread_cancel_execution_command (struct thread_info *thr) |
| { |
| if (thr->thread_fsm != NULL) |
| { |
| thread_fsm_clean_up (thr->thread_fsm, thr); |
| thread_fsm_delete (thr->thread_fsm); |
| thr->thread_fsm = 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. */ |
| delete_at_next_stop (&tp->control.step_resume_breakpoint); |
| delete_at_next_stop (&tp->control.exception_resume_breakpoint); |
| delete_at_next_stop (&tp->control.single_step_breakpoints); |
| |
| delete_longjmp_breakpoint_at_next_stop (tp->global_num); |
| |
| bpstat_clear (&tp->control.stop_bpstat); |
| |
| btrace_teardown (tp); |
| |
| thread_cancel_execution_command (tp); |
| } |
| |
| static void |
| free_thread (struct thread_info *tp) |
| { |
| if (tp->priv) |
| { |
| if (tp->private_dtor) |
| tp->private_dtor (tp->priv); |
| else |
| xfree (tp->priv); |
| } |
| |
| 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; |
| threads_executing = 0; |
| } |
| |
| /* Allocate a new thread of inferior INF with target id PTID and add |
| it to the thread list. */ |
| |
| static struct thread_info * |
| new_thread (struct inferior *inf, ptid_t ptid) |
| { |
| struct thread_info *tp; |
| |
| gdb_assert (inf != NULL); |
| |
| tp = XCNEW (struct thread_info); |
| |
| tp->ptid = ptid; |
| tp->global_num = ++highest_thread_num; |
| tp->inf = inf; |
| tp->per_inf_num = ++inf->highest_thread_num; |
| |
| if (thread_list == NULL) |
| thread_list = tp; |
| else |
| { |
| struct thread_info *last; |
| |
| for (last = thread_list; last->next != NULL; last = last->next) |
| ; |
| last->next = tp; |
| } |
| |
| /* Nothing to follow yet. */ |
| tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| tp->state = THREAD_STOPPED; |
| tp->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; |
| |
| return tp; |
| } |
| |
| struct thread_info * |
| add_thread_silent (ptid_t ptid) |
| { |
| struct thread_info *tp; |
| struct inferior *inf = find_inferior_ptid (ptid); |
| gdb_assert (inf != NULL); |
| |
| 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 (tp == global_user_selection ()->thread ()) |
| global_user_selection ()->select_thread (NULL, false); |
| |
| if (ptid_equal (inferior_ptid, ptid)) |
| { |
| tp = new_thread (inf, 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 (inf, ptid); |
| observer_notify_new_thread (tp); |
| |
| return tp; |
| } |
| |
| struct thread_info * |
| add_thread_with_info (ptid_t ptid, struct private_thread_info *priv) |
| { |
| struct thread_info *result = add_thread_silent (ptid); |
| |
| result->priv = priv; |
| |
| 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); |
| } |
| |
| /* Add TP to the end of the step-over chain LIST_P. */ |
| |
| static void |
| step_over_chain_enqueue (struct thread_info **list_p, struct thread_info *tp) |
| { |
| gdb_assert (tp->step_over_next == NULL); |
| gdb_assert (tp->step_over_prev == NULL); |
| |
| if (*list_p == NULL) |
| { |
| *list_p = tp; |
| tp->step_over_prev = tp->step_over_next = tp; |
| } |
| else |
| { |
| struct thread_info *head = *list_p; |
| struct thread_info *tail = head->step_over_prev; |
| |
| tp->step_over_prev = tail; |
| tp->step_over_next = head; |
| head->step_over_prev = tp; |
| tail->step_over_next = tp; |
| } |
| } |
| |
| /* Remove TP from step-over chain LIST_P. */ |
| |
| static void |
| step_over_chain_remove (struct thread_info **list_p, struct thread_info *tp) |
| { |
| gdb_assert (tp->step_over_next != NULL); |
| gdb_assert (tp->step_over_prev != NULL); |
| |
| if (*list_p == tp) |
| { |
| if (tp == tp->step_over_next) |
| *list_p = NULL; |
| else |
| *list_p = tp->step_over_next; |
| } |
| |
| tp->step_over_prev->step_over_next = tp->step_over_next; |
| tp->step_over_next->step_over_prev = tp->step_over_prev; |
| tp->step_over_prev = tp->step_over_next = NULL; |
| } |
| |
| /* See gdbthread.h. */ |
| |
| struct thread_info * |
| thread_step_over_chain_next (struct thread_info *tp) |
| { |
| struct thread_info *next = tp->step_over_next; |
| |
| return (next == step_over_queue_head ? NULL : next); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| int |
| thread_is_in_step_over_chain (struct thread_info *tp) |
| { |
| return (tp->step_over_next != NULL); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| thread_step_over_chain_enqueue (struct thread_info *tp) |
| { |
| step_over_chain_enqueue (&step_over_queue_head, tp); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| thread_step_over_chain_remove (struct thread_info *tp) |
| { |
| step_over_chain_remove (&step_over_queue_head, tp); |
| } |
| |
| /* 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; |
| |
| /* Dead threads don't need to step-over. Remove from queue. */ |
| if (tp->step_over_next != NULL) |
| thread_step_over_chain_remove (tp); |
| |
| /* 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_global_id (int global_id) |
| { |
| struct thread_info *tp; |
| |
| for (tp = thread_list; tp; tp = tp->next) |
| if (tp->global_num == global_id) |
| return tp; |
| |
| return NULL; |
| } |
| |
| static struct thread_info * |
| find_thread_id (struct inferior *inf, int thr_num) |
| { |
| struct thread_info *tp; |
| |
| for (tp = thread_list; tp; tp = tp->next) |
| if (tp->inf == inf && tp->per_inf_num == thr_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 (thread_callback_func callback, |
| 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_global_thread_id (int global_id) |
| { |
| struct thread_info *tp; |
| |
| for (tp = thread_list; tp; tp = tp->next) |
| if (tp->global_num == global_id) |
| return 1; |
| |
| return 0; |
| } |
| |
| int |
| ptid_to_global_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->global_num; |
| |
| return 0; |
| } |
| |
| ptid_t |
| global_thread_id_to_ptid (int global_id) |
| { |
| struct thread_info *thread = find_thread_global_id (global_id); |
| |
| if (thread) |
| return thread->ptid; |
| else |
| return minus_one_ptid; |
| } |
| |
| 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->global_num < ret->global_num) |
| ret = tp; |
| |
| return ret; |
| } |
| |
| struct thread_info * |
| any_thread_of_process (int pid) |
| { |
| struct thread_info *tp; |
| |
| gdb_assert (pid != 0); |
| |
| /* Prefer the current thread. */ |
| if (ptid_get_pid (inferior_ptid) == pid) |
| return inferior_thread (); |
| |
| ALL_NON_EXITED_THREADS (tp) |
| if (ptid_get_pid (tp->ptid) == pid) |
| return tp; |
| |
| return NULL; |
| } |
| |
| struct thread_info * |
| any_live_thread_of_process (int pid) |
| { |
| struct thread_info *curr_tp = NULL; |
| struct thread_info *tp; |
| struct thread_info *tp_executing = NULL; |
| |
| gdb_assert (pid != 0); |
| |
| /* Prefer the current thread if it's not executing. */ |
| if (ptid_get_pid (inferior_ptid) == pid) |
| { |
| /* If the current thread is dead, forget it. If it's not |
| executing, use it. Otherwise, still choose it (below), but |
| only if no other non-executing thread is found. */ |
| curr_tp = inferior_thread (); |
| if (curr_tp->state == THREAD_EXITED) |
| curr_tp = NULL; |
| else if (!curr_tp->executing) |
| return curr_tp; |
| } |
| |
| ALL_NON_EXITED_THREADS (tp) |
| if (ptid_get_pid (tp->ptid) == pid) |
| { |
| if (!tp->executing) |
| return tp; |
| |
| tp_executing = tp; |
| } |
| |
| /* If both the current thread and all live threads are executing, |
| prefer the current thread. */ |
| if (curr_tp != NULL) |
| return curr_tp; |
| |
| /* Otherwise, just return an executing thread, if any. */ |
| 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->global_num; |
| |
| num++; |
| uiout->field_int ("thread-id", tp->global_num); |
| } |
| |
| do_cleanups (cleanup_chain); |
| |
| if (current_thread != -1) |
| uiout->field_int ("current-thread-id", current_thread); |
| uiout->field_int ("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; |
| } |
| |
| /* See gdbthreads.h. */ |
| |
| void |
| prune_threads (void) |
| { |
| struct thread_info *tp, *tmp; |
| |
| ALL_THREADS_SAFE (tp, tmp) |
| { |
| if (!thread_alive (tp)) |
| delete_thread (tp->ptid); |
| } |
| } |
| |
| /* See gdbthreads.h. */ |
| |
| void |
| delete_exited_threads (void) |
| { |
| struct thread_info *tp, *tmp; |
| |
| ALL_THREADS_SAFE (tp, tmp) |
| { |
| if (tp->state == THREAD_EXITED) |
| delete_thread (tp->ptid); |
| } |
| } |
| |
| /* Disable storing stack temporaries for the thread whose id is |
| stored in DATA. */ |
| |
| static void |
| disable_thread_stack_temporaries (void *data) |
| { |
| ptid_t *pd = (ptid_t *) data; |
| struct thread_info *tp = find_thread_ptid (*pd); |
| |
| if (tp != NULL) |
| { |
| tp->stack_temporaries_enabled = 0; |
| VEC_free (value_ptr, tp->stack_temporaries); |
| } |
| |
| xfree (pd); |
| } |
| |
| /* Enable storing stack temporaries for thread with id PTID and return a |
| cleanup which can disable and clear the stack temporaries. */ |
| |
| struct cleanup * |
| enable_thread_stack_temporaries (ptid_t ptid) |
| { |
| struct thread_info *tp = find_thread_ptid (ptid); |
| ptid_t *data; |
| struct cleanup *c; |
| |
| gdb_assert (tp != NULL); |
| |
| tp->stack_temporaries_enabled = 1; |
| tp->stack_temporaries = NULL; |
| data = XNEW (ptid_t); |
| *data = ptid; |
| c = make_cleanup (disable_thread_stack_temporaries, data); |
| |
| return c; |
| } |
| |
| /* Return non-zero value if stack temporaies are enabled for the thread |
| with id PTID. */ |
| |
| int |
| thread_stack_temporaries_enabled_p (ptid_t ptid) |
| { |
| struct thread_info *tp = find_thread_ptid (ptid); |
| |
| if (tp == NULL) |
| return 0; |
| else |
| return tp->stack_temporaries_enabled; |
| } |
| |
| /* Push V on to the stack temporaries of the thread with id PTID. */ |
| |
| void |
| push_thread_stack_temporary (ptid_t ptid, struct value *v) |
| { |
| struct thread_info *tp = find_thread_ptid (ptid); |
| |
| gdb_assert (tp != NULL && tp->stack_temporaries_enabled); |
| VEC_safe_push (value_ptr, tp->stack_temporaries, v); |
| } |
| |
| /* Return 1 if VAL is among the stack temporaries of the thread |
| with id PTID. Return 0 otherwise. */ |
| |
| int |
| value_in_thread_stack_temporaries (struct value *val, ptid_t ptid) |
| { |
| struct thread_info *tp = find_thread_ptid (ptid); |
| |
| gdb_assert (tp != NULL && tp->stack_temporaries_enabled); |
| if (!VEC_empty (value_ptr, tp->stack_temporaries)) |
| { |
| struct value *v; |
| int i; |
| |
| for (i = 0; VEC_iterate (value_ptr, tp->stack_temporaries, i, v); i++) |
| if (v == val) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Return the last of the stack temporaries for thread with id PTID. |
| Return NULL if there are no stack temporaries for the thread. */ |
| |
| struct value * |
| get_last_thread_stack_temporary (ptid_t ptid) |
| { |
| struct value *lastval = NULL; |
| struct thread_info *tp = find_thread_ptid (ptid); |
| |
| gdb_assert (tp != NULL); |
| if (!VEC_empty (value_ptr, tp->stack_temporaries)) |
| lastval = VEC_last (value_ptr, tp->stack_temporaries); |
| |
| return lastval; |
| } |
| |
| 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_ptid (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); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| set_resumed (ptid_t ptid, int resumed) |
| { |
| 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->resumed = resumed; |
| } |
| else |
| { |
| tp = find_thread_ptid (ptid); |
| gdb_assert (tp != NULL); |
| tp->resumed = resumed; |
| } |
| } |
| |
| /* Helper for set_running, that marks one thread either running or |
| stopped. */ |
| |
| static int |
| set_running_thread (struct thread_info *tp, int running) |
| { |
| int started = 0; |
| |
| if (running && tp->state == THREAD_STOPPED) |
| started = 1; |
| tp->state = running ? THREAD_RUNNING : THREAD_STOPPED; |
| |
| if (!running) |
| { |
| /* If the thread is now marked stopped, remove it from |
| the step-over queue, so that we don't try to resume |
| it until the user wants it to. */ |
| if (tp->step_over_next != NULL) |
| thread_step_over_chain_remove (tp); |
| } |
| |
| return started; |
| } |
| |
| void |
| set_running (ptid_t ptid, int running) |
| { |
| struct thread_info *tp; |
| int all = ptid_equal (ptid, minus_one_ptid); |
| int any_started = 0; |
| |
| /* 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)) |
| { |
| 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 (set_running_thread (tp, running)) |
| any_started = 1; |
| } |
| } |
| else |
| { |
| tp = find_thread_ptid (ptid); |
| gdb_assert (tp != NULL); |
| gdb_assert (tp->state != THREAD_EXITED); |
| if (set_running_thread (tp, running)) |
| any_started = 1; |
| } |
| if (any_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); |
| } |
| |
| bool |
| is_stopped (struct thread_info *thread) |
| { |
| return thread->state == THREAD_STOPPED; |
| } |
| |
| int |
| is_exited (ptid_t ptid) |
| { |
| return is_thread_state (ptid, THREAD_EXITED); |
| } |
| |
| bool |
| is_exited (struct thread_info *thread) |
| { |
| return thread->state == THREAD_EXITED; |
| } |
| |
| int |
| is_running (ptid_t ptid) |
| { |
| return is_thread_state (ptid, THREAD_RUNNING); |
| } |
| |
| 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; |
| } |
| |
| /* It only takes one running thread to spawn more threads.*/ |
| if (executing) |
| threads_executing = 1; |
| /* Only clear the flag if the caller is telling us everything is |
| stopped. */ |
| else if (ptid_equal (minus_one_ptid, ptid)) |
| threads_executing = 0; |
| } |
| |
| /* See gdbthread.h. */ |
| |
| int |
| threads_are_executing (void) |
| { |
| return threads_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 (set_running_thread (tp, tp->executing)) |
| any_started = 1; |
| } |
| } |
| } |
| else |
| { |
| tp = find_thread_ptid (ptid); |
| gdb_assert (tp); |
| if (tp->state != THREAD_EXITED) |
| { |
| if (set_running_thread (tp, tp->executing)) |
| any_started = 1; |
| } |
| } |
| |
| if (any_started) |
| observer_notify_target_resumed (ptid); |
| } |
| |
| void |
| finish_thread_state_cleanup (void *arg) |
| { |
| ptid_t *ptid_p = (ptid_t *) arg; |
| |
| gdb_assert (arg); |
| |
| finish_thread_state (*ptid_p); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| validate_registers_access (void) |
| { |
| /* No selected thread, no registers. */ |
| if (ptid_equal (inferior_ptid, null_ptid)) |
| error (_("No thread selected.")); |
| |
| /* Don't try to read from a dead thread. */ |
| if (is_exited (inferior_ptid)) |
| error (_("The current thread has terminated")); |
| |
| /* ... or from a spinning thread. FIXME: This isn't actually fully |
| correct. It'll allow an user-requested access (e.g., "print $pc" |
| at the prompt) when a thread is not executing for some internal |
| reason, but is marked running from the user's perspective. E.g., |
| the thread is waiting for its turn in the step-over queue. */ |
| if (is_executing (inferior_ptid)) |
| error (_("Selected thread is running.")); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| bool |
| can_access_registers_ptid (ptid_t ptid) |
| { |
| /* No thread, no registers. */ |
| if (ptid_equal (ptid, null_ptid)) |
| return false; |
| |
| /* Don't try to read from a dead thread. */ |
| if (is_exited (ptid)) |
| return false; |
| |
| /* ... or from a spinning thread. FIXME: see validate_registers_access. */ |
| if (is_executing (ptid)) |
| return false; |
| |
| return true; |
| } |
| |
| 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); |
| } |
| |
| /* Helper for print_thread_info. Returns true if THR should be |
| printed. If REQUESTED_THREADS, a list of GDB ids/ranges, is not |
| NULL, only print THR if its ID is included in the list. GLOBAL_IDS |
| is true if REQUESTED_THREADS is list of global IDs, false if a list |
| of per-inferior thread ids. If PID is not -1, only print THR if it |
| is a thread from the process PID. Otherwise, threads from all |
| attached PIDs are printed. If both REQUESTED_THREADS is not NULL |
| and PID is not -1, then the thread is printed if it belongs to the |
| specified process. Otherwise, an error is raised. */ |
| |
| static int |
| should_print_thread (const char *requested_threads, int default_inf_num, |
| int global_ids, int pid, struct thread_info *thr) |
| { |
| if (requested_threads != NULL && *requested_threads != '\0') |
| { |
| int in_list; |
| |
| if (global_ids) |
| in_list = number_is_in_list (requested_threads, thr->global_num); |
| else |
| in_list = tid_is_in_list (requested_threads, default_inf_num, |
| thr->inf->num, thr->per_inf_num); |
| if (!in_list) |
| return 0; |
| } |
| |
| if (pid != -1 && ptid_get_pid (thr->ptid) != pid) |
| { |
| if (requested_threads != NULL && *requested_threads != '\0') |
| error (_("Requested thread not found in requested process")); |
| return 0; |
| } |
| |
| if (thr->state == THREAD_EXITED) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* Like print_thread_info, but in addition, GLOBAL_IDS indicates |
| whether REQUESTED_THREADS is a list of global or per-inferior |
| thread ids. */ |
| |
| static void |
| print_thread_info_1 (struct ui_out *uiout, char *requested_threads, |
| int global_ids, int pid, |
| int show_global_ids) |
| { |
| struct thread_info *tp; |
| const struct thread_info *current_thread |
| = global_user_selection ()->thread (); |
| struct cleanup *old_chain; |
| const char *extra_info, *name, *target_id; |
| struct inferior *inf; |
| int default_inf_num = current_inferior ()->num; |
| |
| update_thread_list (); |
| |
| /* 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 (uiout->is_mi_like_p ()) |
| make_cleanup_ui_out_list_begin_end (uiout, "threads"); |
| else |
| { |
| int n_threads = 0; |
| |
| for (tp = thread_list; tp; tp = tp->next) |
| { |
| if (!should_print_thread (requested_threads, default_inf_num, |
| global_ids, pid, tp)) |
| continue; |
| |
| ++n_threads; |
| } |
| |
| if (n_threads == 0) |
| { |
| if (requested_threads == NULL || *requested_threads == '\0') |
| uiout->message (_("No threads.\n")); |
| else |
| uiout->message (_("No threads match '%s'.\n"), |
| requested_threads); |
| do_cleanups (old_chain); |
| return; |
| } |
| |
| if (show_global_ids || uiout->is_mi_like_p ()) |
| make_cleanup_ui_out_table_begin_end (uiout, 5, n_threads, "threads"); |
| else |
| make_cleanup_ui_out_table_begin_end (uiout, 4, n_threads, "threads"); |
| |
| uiout->table_header (1, ui_left, "current", ""); |
| |
| if (!uiout->is_mi_like_p ()) |
| uiout->table_header (4, ui_left, "id-in-tg", "Id"); |
| if (show_global_ids || uiout->is_mi_like_p ()) |
| uiout->table_header (4, ui_left, "id", "GId"); |
| uiout->table_header (17, ui_left, "target-id", "Target Id"); |
| uiout->table_header (1, ui_left, "frame", "Frame"); |
| uiout->table_body (); |
| } |
| |
| ALL_THREADS_BY_INFERIOR (inf, tp) |
| { |
| struct cleanup *chain2; |
| int core; |
| |
| if (!should_print_thread (requested_threads, default_inf_num, |
| global_ids, pid, tp)) |
| continue; |
| |
| chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); |
| |
| if (uiout->is_mi_like_p ()) |
| { |
| /* Compatibility. */ |
| if (tp == current_thread) |
| uiout->text ("* "); |
| else |
| uiout->text (" "); |
| } |
| else |
| { |
| if (tp == current_thread) |
| uiout->field_string ("current", "*"); |
| else |
| uiout->field_skip ("current"); |
| } |
| |
| if (!uiout->is_mi_like_p ()) |
| uiout->field_string ("id-in-tg", print_thread_id (tp)); |
| |
| if (show_global_ids || uiout->is_mi_like_p ()) |
| uiout->field_int ("id", tp->global_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 (uiout->is_mi_like_p ()) |
| { |
| uiout->field_string ("target-id", target_id); |
| if (extra_info) |
| uiout->field_string ("details", extra_info); |
| if (name) |
| uiout->field_string ("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); |
| |
| uiout->field_string ("target-id", contents); |
| do_cleanups (str_cleanup); |
| } |
| |
| if (tp->state == THREAD_RUNNING) |
| uiout->text ("(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. */ |
| uiout->is_mi_like_p (), |
| LOCATION, 0); |
| } |
| |
| if (uiout->is_mi_like_p ()) |
| { |
| char *state = "stopped"; |
| |
| if (tp->state == THREAD_RUNNING) |
| state = "running"; |
| uiout->field_string ("state", state); |
| } |
| |
| core = target_core_of_thread (tp->ptid); |
| if (uiout->is_mi_like_p () && core != -1) |
| uiout->field_int ("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) |
| { |
| if (uiout->is_mi_like_p () |
| && !ptid_equal (inferior_ptid, null_ptid)) |
| { |
| int num = ptid_to_global_thread_id (inferior_ptid); |
| |
| gdb_assert (num != 0); |
| uiout->field_int ("current-thread-id", num); |
| } |
| |
| if (!ptid_equal (inferior_ptid, null_ptid) && is_exited (inferior_ptid)) |
| uiout->message ("\n\ |
| The current thread <Thread ID %s> has terminated. See `help thread'.\n", |
| print_thread_id (inferior_thread ())); |
| else if (thread_list != NULL |
| && ptid_equal (inferior_ptid, null_ptid)) |
| uiout->message ("\n\ |
| No selected thread. See `help thread'.\n"); |
| } |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| print_thread_info (struct ui_out *uiout, char *requested_threads, int pid) |
| { |
| print_thread_info_1 (uiout, requested_threads, 1, pid, 0); |
| } |
| |
| /* Implementation of the "info threads" command. |
| |
| 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) |
| { |
| int show_global_ids = 0; |
| |
| if (arg != NULL |
| && check_for_argument (&arg, "-gid", sizeof ("-gid") - 1)) |
| { |
| arg = skip_spaces (arg); |
| show_global_ids = 1; |
| } |
| |
| print_thread_info_1 (current_uiout, arg, 0, -1, show_global_ids); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| void |
| switch_to_thread_no_regs (struct thread_info *thread) |
| { |
| struct inferior *inf; |
| |
| inf = find_inferior_ptid (thread->ptid); |
| gdb_assert (inf != NULL); |
| set_current_program_space (inf->pspace); |
| set_current_inferior (inf); |
| |
| inferior_ptid = thread->ptid; |
| stop_pc = ~(CORE_ADDR) 0; |
| } |
| |
| /* 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_ptid (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 && !current_uiout->is_mi_like_p ()) |
| { |
| 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); |
| } |
| } |
| |
| /* Data used by the cleanup installed by |
| 'make_cleanup_restore_current_thread'. */ |
| |
| struct current_thread_cleanup |
| { |
| /* Next in list of currently installed 'struct |
| current_thread_cleanup' cleanups. See |
| 'current_thread_cleanup_chain' below. */ |
| struct current_thread_cleanup *next; |
| |
| ptid_t inferior_ptid; |
| struct frame_id selected_frame_id; |
| int selected_frame_level; |
| int was_stopped; |
| int inf_id; |
| int was_removable; |
| }; |
| |
| /* A chain of currently installed 'struct current_thread_cleanup' |
| cleanups. Restoring the previously selected thread looks up the |
| old thread in the thread list by ptid. If the thread changes ptid, |
| we need to update the cleanup's thread structure so the look up |
| succeeds. */ |
| static struct current_thread_cleanup *current_thread_cleanup_chain; |
| |
| /* A thread_ptid_changed observer. Update all currently installed |
| current_thread_cleanup cleanups that want to switch back to |
| OLD_PTID to switch back to NEW_PTID instead. */ |
| |
| static void |
| restore_current_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) |
| { |
| struct current_thread_cleanup *it; |
| |
| for (it = current_thread_cleanup_chain; it != NULL; it = it->next) |
| { |
| if (ptid_equal (it->inferior_ptid, old_ptid)) |
| it->inferior_ptid = new_ptid; |
| } |
| } |
| |
| static void |
| do_restore_current_thread_cleanup (void *arg) |
| { |
| struct thread_info *tp; |
| struct current_thread_cleanup *old = (struct current_thread_cleanup *) 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_ptid (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 = (struct current_thread_cleanup *) arg; |
| struct thread_info *tp; |
| struct inferior *inf; |
| |
| current_thread_cleanup_chain = current_thread_cleanup_chain->next; |
| |
| tp = find_thread_ptid (old->inferior_ptid); |
| if (tp) |
| tp->put (); |
| |
| 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 |
| = (struct thread_array_cleanup *) data; |
| |
| for (k = 0; k != ta_cleanup->count; k++) |
| ta_cleanup->tp_array[k]->put (); |
| } |
| |
| struct cleanup * |
| make_cleanup_restore_current_thread (void) |
| { |
| struct thread_info *tp; |
| struct frame_info *frame; |
| struct current_thread_cleanup *old = XNEW (struct current_thread_cleanup); |
| |
| old->inferior_ptid = inferior_ptid; |
| old->inf_id = current_inferior ()->num; |
| old->was_removable = current_inferior ()->removable; |
| |
| old->next = current_thread_cleanup_chain; |
| current_thread_cleanup_chain = old; |
| |
| 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->get (); |
| } |
| |
| current_inferior ()->removable = 0; |
| |
| return make_cleanup_dtor (do_restore_current_thread_cleanup, old, |
| restore_current_thread_cleanup_dtor); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| int |
| show_thread_that_caused_stop (void) |
| { |
| return highest_thread_num > 1; |
| } |
| |
| /* See gdbthread.h. */ |
| |
| int |
| show_inferior_qualified_tids (void) |
| { |
| return (inferior_list->next != NULL || inferior_list->num != 1); |
| } |
| |
| /* See gdbthread.h. */ |
| |
| const char * |
| print_thread_id (struct thread_info *thr) |
| { |
| char *s = get_print_cell (); |
| |
| if (show_inferior_qualified_tids ()) |
| xsnprintf (s, PRINT_CELL_SIZE, "%d.%d", thr->inf->num, thr->per_inf_num); |
| else |
| xsnprintf (s, PRINT_CELL_SIZE, "%d", thr->per_inf_num); |
| return s; |
| } |
| |
| /* If non-zero tp_array_compar should sort in ascending order, otherwise in |
| descending order. */ |
| |
| static int tp_array_compar_ascending; |
| |
| /* Sort an array for struct thread_info pointers by thread ID (first |
| by inferior number, and then by per-inferior thread number). The |
| order is determined by TP_ARRAY_COMPAR_ASCENDING. */ |
| |
| static int |
| tp_array_compar (const void *ap_voidp, const void *bp_voidp) |
| { |
| const struct thread_info *a = *(const struct thread_info * const *) ap_voidp; |
| const struct thread_info *b = *(const struct thread_info * const *) bp_voidp; |
| |
| if (a->inf->num != b->inf->num) |
| { |
| return (((a->inf->num > b->inf->num) - (a->inf->num < b->inf->num)) |
| * (tp_array_compar_ascending ? +1 : -1)); |
| } |
| |
| return (((a->per_inf_num > b->per_inf_num) |
| - (a->per_inf_num < b->per_inf_num)) |
| * (tp_array_compar_ascending ? +1 : -1)); |
| } |
| |
| /* 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; |
| |
| tp_array_compar_ascending = 0; |
| if (cmd != NULL |
| && check_for_argument (&cmd, "-ascending", strlen ("-ascending"))) |
| { |
| cmd = skip_spaces (cmd); |
| tp_array_compar_ascending = 1; |
| } |
| |
| 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); |
| |
| /* Note this includes exited threads. */ |
| tc = thread_count (); |
| if (tc != 0) |
| { |
| 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 = XNEWVEC (struct thread_info *, tc); |
| make_cleanup (xfree, tp_array); |
| |
| ALL_NON_EXITED_THREADS (tp) |
| { |
| tp_array[i] = tp; |
| tp->get (); |
| i++; |
| } |
| /* Because we skipped exited threads, we may end up with fewer |
| threads in the array than the total count of threads. */ |
| gdb_assert (i <= tc); |
| |
| if (i != 0) |
| qsort (tp_array, i, sizeof (*tp_array), tp_array_compar); |
| |
| ta_cleanup.tp_array = tp_array; |
| ta_cleanup.count = 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 %s (%s):\n"), |
| print_thread_id (tp_array[k]), |
| target_pid_to_str (inferior_ptid)); |
| execute_command (cmd, from_tty); |
| |
| /* Restore exact command used previously. */ |
| strcpy (cmd, saved_cmd); |
| } |
| } |
| |
| do_cleanups (old_chain); |
| } |
| |
| /* Implementation of the "thread apply" command. */ |
| |
| static void |
| thread_apply_command (char *tidlist, int from_tty) |
| { |
| char *cmd = NULL; |
| struct cleanup *old_chain; |
| char *saved_cmd; |
| tid_range_parser parser; |
| |
| if (tidlist == NULL || *tidlist == '\000') |
| error (_("Please specify a thread ID list")); |
| |
| parser.init (tidlist, current_inferior ()->num); |
| while (!parser.finished ()) |
| { |
| int inf_num, thr_start, thr_end; |
| |
| if (!parser.get_tid_range (&inf_num, &thr_start, &thr_end)) |
| { |
| cmd = (char *) parser.cur_tok (); |
| break; |
| } |
| } |
| |
| if (cmd == NULL) |
| error (_("Please specify a command following the thread ID list")); |
| |
| if (tidlist == cmd || !isalpha (cmd[0])) |
| invalid_thread_id_error (cmd); |
| |
| /* 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); |
| |
| make_cleanup_restore_current_thread (); |
| |
| parser.init (tidlist, current_inferior ()->num); |
| while (!parser.finished () && parser.cur_tok () < cmd) |
| { |
| struct thread_info *tp = NULL; |
| struct inferior *inf; |
| int inf_num, thr_num; |
| |
| parser.get_tid (&inf_num, &thr_num); |
| inf = find_inferior_id (inf_num); |
| if (inf != NULL) |
| tp = find_thread_id (inf, thr_num); |
| |
| if (parser.in_star_range ()) |
| { |
| if (inf == NULL) |
| { |
| warning (_("Unknown inferior %d"), inf_num); |
| parser.skip_range (); |
| continue; |
| } |
| |
| /* No use looking for threads past the highest thread number |
| the inferior ever had. */ |
| if (thr_num >= inf->highest_thread_num) |
| parser.skip_range (); |
| |
| /* Be quiet about unknown threads numbers. */ |
| if (tp == NULL) |
| continue; |
| } |
| |
| if (tp == NULL) |
| { |
| if (show_inferior_qualified_tids () || parser.tid_is_qualified ()) |
| warning (_("Unknown thread %d.%d"), inf_num, thr_num); |
| else |
| warning (_("Unknown thread %d"), thr_num); |
| continue; |
| } |
| |
| if (!thread_alive (tp)) |
| { |
| warning (_("Thread %s has terminated."), print_thread_id (tp)); |
| continue; |
| } |
| |
| switch_to_thread (tp->ptid); |
| |
| printf_filtered (_("\nThread %s (%s):\n"), print_thread_id (tp), |
| 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'. */ |
| |
| void |
| thread_command (char *tidstr, int from_tty) |
| { |
| user_selection *us = global_user_selection (); |
| |
| if (tidstr == NULL) |
| { |
| struct thread_info *thread = us->thread (); |
| |
| if (thread == nullptr) |
| error (_("No thread selected")); |
| |
| if (target_has_stack) |
| { |
| if (is_exited (thread)) |
| printf_filtered (_("[Current thread is %s (%s) (exited)]\n"), |
| print_thread_id (thread), |
| target_pid_to_str (thread->ptid)); |
| else |
| printf_filtered (_("[Current thread is %s (%s)]\n"), |
| print_thread_id (thread), |
| target_pid_to_str (thread->ptid)); |
| } |
| else |
| error (_("No stack.")); |
| } |
| else |
| { |
| if (!thread_select (tidstr, true)) |
| print_selected_thread_frame (current_uiout, us, |
| USER_SELECTED_THREAD | USER_SELECTED_FRAME); |
| } |
| } |
| |
| /* 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; |
| const 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 %s has name '%s'\n"), |
| print_thread_id (tp), tp->name); |
| match++; |
| } |
| |
| tmp = target_thread_name (tp); |
| if (tmp != NULL && re_exec (tmp)) |
| { |
| printf_filtered (_("Thread %s has target name '%s'\n"), |
| print_thread_id (tp), tmp); |
| match++; |
| } |
| |
| tmp = target_pid_to_str (tp->ptid); |
| if (tmp != NULL && re_exec (tmp)) |
| { |
| printf_filtered (_("Thread %s has target id '%s'\n"), |
| print_thread_id (tp), tmp); |
| match++; |
| } |
| |
| tmp = target_extra_thread_info (tp); |
| if (tmp != NULL && re_exec (tmp)) |
| { |
| printf_filtered (_("Thread %s has extra info '%s'\n"), |
| print_thread_id (tp), 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); |
| } |
| |
| bool |
| thread_select (const char *tidstr, bool tid_is_qualified) |
| { |
| struct thread_info *thread; |
| |
| if (tid_is_qualified) |
| { |
| thread = parse_thread_id (tidstr, NULL); |
| |
| /* parse_thread_id is not supposed to return NULL. */ |
| gdb_assert (thread != NULL); |
| } |
| else |
| { |
| int num = value_as_long (parse_and_eval (tidstr)); |
| |
| thread = find_thread_global_id (num); |
| if (thread == NULL) |
| error (_("Thread ID %d not known."), num); |
| } |
| |
| if (!thread_alive (thread)) |
| error (_("Thread ID %s has terminated."), tidstr); |
| |
| annotate_thread_changed (); |
| |
| if (global_user_selection ()->select_thread (thread, true)) |
| { |
| /* Since the current thread may have changed, see if there is any |
| exited thread we can now delete. */ |
| prune_threads (); |
| |
| return true; |
| } |
| else |
| return false; |
| } |
| |
| /* Print thread and frame switch command response. */ |
| |
| void |
| print_selected_thread_frame (struct ui_out *uiout, |
| user_selection *us, |
| user_selected_what selection) |
| { |
| struct inferior *inf = us->inferior (); |
| struct thread_info *thread = us->thread (); |
| |
| if (thread == nullptr) |
| return; |
| |
| if (selection & USER_SELECTED_THREAD) |
| { |
| if (uiout->is_mi_like_p ()) |
| { |
| uiout->field_int ("new-thread-id", |
| inferior_thread ()->global_num); |
| } |
| else |
| { |
| const char *thread_id = print_thread_id (thread); |
| const char *pid_str = target_pid_to_str (thread->ptid); |
| const char *running_str |
| = thread->state == THREAD_RUNNING ? " (running)" : ""; |
| |
| uiout->field_fmt (NULL, "[Switching to thread %s (%s)]%s\n", |
| thread_id, pid_str, running_str); |
| } |
| } |
| |
| if ((selection & USER_SELECTED_FRAME) |
| && thread->state == THREAD_STOPPED) |
| { |
| struct frame_info *frame = us->frame (); |
| |
| if (frame != nullptr) |
| print_stack_frame_to_uiout (uiout, frame, 1, SRC_AND_LOC, 1); |
| else |
| uiout->message (_("No selected frame.\n")); |
| } |
| } |
| |
| /* Update the 'threads_executing' global based on the threads we know |
| about right now. */ |
| |
| static void |
| update_threads_executing (void) |
| { |
| struct thread_info *tp; |
| |
| threads_executing = 0; |
| ALL_NON_EXITED_THREADS (tp) |
| { |
| if (tp->executing) |
| { |
| threads_executing = 1; |
| break; |
| } |
| } |
| } |
| |
| void |
| update_thread_list (void) |
| { |
| target_update_thread_list (); |
| update_threads_executing (); |
| } |
| |
| /* Return a new value for the selected thread's id. Return a value of |
| 0 if no thread is selected. If GLOBAL is true, return the thread's |
| global number. Otherwise return the per-inferior number. */ |
| |
| static struct value * |
| thread_num_make_value_helper (struct gdbarch *gdbarch, int global) |
| { |
| struct thread_info *tp = find_thread_ptid (inferior_ptid); |
| int int_val; |
| |
| if (tp == NULL) |
| int_val = 0; |
| else if (global) |
| int_val = tp->global_num; |
| else |
| int_val = tp->per_inf_num; |
| |
| return value_from_longest (builtin_type (gdbarch)->builtin_int, int_val); |
| } |
| |
| /* Return a new value for the selected thread's per-inferior thread |
| number. Return a value of 0 if no thread is selected, or no |
| threads exist. */ |
| |
| static struct value * |
| thread_id_per_inf_num_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
| void *ignore) |
| { |
| return thread_num_make_value_helper (gdbarch, 0); |
| } |
| |
| /* Return a new value for the selected thread's global id. Return a |
| value of 0 if no thread is selected, or no threads exist. */ |
| |
| static struct value * |
| global_thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
| void *ignore) |
| { |
| return thread_num_make_value_helper (gdbarch, 1); |
| } |
| |
| /* 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_per_inf_num_make_value, |
| NULL, |
| NULL |
| }; |
| |
| /* Implementation of `gthread' variable. */ |
| |
| static const struct internalvar_funcs gthread_funcs = |
| { |
| global_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 [-gid] [ID]...\n\ |
| -gid: Show global thread IDs.\n\ |
| If ID is given, it is a space-separated list of IDs of threads to display.\n\ |
| Otherwise, 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.\n\ |
| \n\ |
| Usage: thread apply all [-ascending] <command>\n\ |
| -ascending: Call <command> for all threads in ascending order.\n\ |
| The default is descending order.\ |
| "), |
| &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); |
| |
| 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); |
| create_internalvar_type_lazy ("_gthread", >hread_funcs, NULL); |
| |
| observer_attach_thread_ptid_changed (restore_current_thread_ptid_changed); |
| } |