/* Multi-process/thread control for GDB, the GNU debugger. Copyright (C) 1986-2018 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 . */ #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 "btrace.h" #include #include #include #include "ui-out.h" #include "observable.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 #include "common/gdb_optional.h" /* Definition of struct thread_info exported to gdbthread.h. */ /* 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 int thread_alive (struct thread_info *); /* RAII type used to increase / decrease the refcount of each thread in a given list of threads. */ class scoped_inc_dec_ref { public: explicit scoped_inc_dec_ref (const std::vector &thrds) : m_thrds (thrds) { for (thread_info *thr : m_thrds) thr->incref (); } ~scoped_inc_dec_ref () { for (thread_info *thr : m_thrds) thr->decref (); } private: const std::vector &m_thrds; }; 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, const 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); } /* Set the TP's state as exited. */ static void set_thread_exited (thread_info *tp, int silent) { /* Dead threads don't need to step-over. Remove from queue. */ if (tp->step_over_next != NULL) thread_step_over_chain_remove (tp); if (tp->state != THREAD_EXITED) { gdb::observers::thread_exit.notify (tp, silent); /* Tag it as exited. */ tp->state = THREAD_EXITED; /* Clear breakpoints, etc. associated with this thread. */ clear_thread_inferior_resources (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; if (tp->deletable ()) delete tp; else set_thread_exited (tp, 1); } 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) { thread_info *tp = new thread_info (inf, ptid); 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; } 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 (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); gdb::observers::new_thread.notify (tp); /* All done. */ return tp; } else /* Just go ahead and delete it. */ delete_thread (ptid); } tp = new_thread (inf, ptid); gdb::observers::new_thread.notify (tp); return tp; } struct thread_info * add_thread_with_info (ptid_t ptid, private_thread_info *priv) { struct thread_info *result = add_thread_silent (ptid); result->priv.reset (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); } private_thread_info::~private_thread_info () = default; thread_info::thread_info (struct inferior *inf_, ptid_t ptid_) : ptid (ptid_), inf (inf_) { gdb_assert (inf_ != NULL); this->global_num = ++highest_thread_num; this->per_inf_num = ++inf_->highest_thread_num; /* Nothing to follow yet. */ memset (&this->pending_follow, 0, sizeof (this->pending_follow)); this->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; this->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; } thread_info::~thread_info () { xfree (this->name); } /* 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 (tp->ptid == ptid) break; if (!tp) return; set_thread_exited (tp, silent); if (!tp->deletable ()) { /* Will be really deleted some other time. */ return; } if (tpprev) tpprev->next = tp->next; else thread_list = tp->next; delete 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 (tp->ptid == ptid) return tp; return NULL; } /* See gdbthread.h. */ struct thread_info * find_thread_by_handle (struct value *thread_handle, struct inferior *inf) { return target_thread_handle_to_thread_info (value_contents_all (thread_handle), TYPE_LENGTH (value_type (thread_handle)), inf); } /* * 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; } /* Return the number of non-exited threads in the thread list. */ static int live_threads_count (void) { int result = 0; struct thread_info *tp; ALL_NON_EXITED_THREADS (tp) ++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 (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 (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; } /* 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); } } /* Return true value if stack temporaies are enabled for the thread with id PTID. */ bool thread_stack_temporaries_enabled_p (ptid_t ptid) { struct thread_info *tp = find_thread_ptid (ptid); if (tp == NULL) return false; 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); tp->stack_temporaries.push_back (v); } /* Return true if VAL is among the stack temporaries of the thread with id PTID. Return false otherwise. */ bool 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); for (struct value *v : tp->stack_temporaries) if (v == val) return true; return false; } /* 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 (!tp->stack_temporaries.empty ()) lastval = tp->stack_temporaries.back (); 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; gdb::observers::thread_ptid_changed.notify (old_ptid, new_ptid); } /* See gdbthread.h. */ void set_resumed (ptid_t ptid, int resumed) { struct thread_info *tp; int all = 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 == 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) gdb::observers::target_resumed.notify (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 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 == 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 (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 == 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) gdb::observers::thread_stop_requested.notify (ptid); } void finish_thread_state (ptid_t ptid) { struct thread_info *tp; int all; int any_started = 0; all = 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) gdb::observers::target_resumed.notify (ptid); } /* See gdbthread.h. */ void validate_registers_access (void) { /* No selected thread, no registers. */ if (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 == 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, const char *requested_threads, int global_ids, int pid, int show_global_ids) { struct thread_info *tp; ptid_t current_ptid; const char *extra_info, *name, *target_id; struct inferior *inf; int default_inf_num = current_inferior ()->num; update_thread_list (); current_ptid = inferior_ptid; { /* For backward compatibility, we make a list for MI. A table is preferable for the CLI, though, because it shows table headers. */ gdb::optional list_emitter; gdb::optional table_emitter; if (uiout->is_mi_like_p ()) list_emitter.emplace (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); return; } table_emitter.emplace (uiout, show_global_ids ? 5 : 4, n_threads, "threads"); uiout->table_header (1, ui_left, "current", ""); uiout->table_header (4, ui_left, "id-in-tg", "Id"); if (show_global_ids) 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 (); } /* We'll be switching threads temporarily. */ scoped_restore_current_thread restore_thread; ALL_THREADS_BY_INFERIOR (inf, tp) { int core; if (!should_print_thread (requested_threads, default_inf_num, global_ids, pid, tp)) continue; ui_out_emit_tuple tuple_emitter (uiout, NULL); if (!uiout->is_mi_like_p ()) { if (tp->ptid == current_ptid) uiout->field_string ("current", "*"); else uiout->field_skip ("current"); 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 { std::string contents; if (extra_info && name) contents = string_printf ("%s \"%s\" (%s)", target_id, name, extra_info); else if (extra_info) contents = string_printf ("%s (%s)", target_id, extra_info); else if (name) contents = string_printf ("%s \"%s\"", target_id, name); else contents = target_id; uiout->field_string ("target-id", contents.c_str ()); } 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 ()) { const 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); } /* This end scope restores the current thread and the frame selected before the "info threads" command, and it finishes the ui-out list or table. */ } if (pid == -1 && requested_threads == NULL) { if (uiout->is_mi_like_p () && 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 (inferior_ptid != null_ptid && is_exited (inferior_ptid)) uiout->message ("\n\ The current thread has terminated. See `help thread'.\n", print_thread_id (inferior_thread ())); else if (thread_list != NULL && 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 (const 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 = thread->inf; set_current_program_space (inf->pspace); set_current_inferior (inf); inferior_ptid = thread->ptid; stop_pc = ~(CORE_ADDR) 0; } /* Switch to no thread selected. */ static void switch_to_no_thread () { if (inferior_ptid == null_ptid) return; inferior_ptid = null_ptid; reinit_frame_cache (); stop_pc = ~(CORE_ADDR) 0; } /* Switch from one thread to another. */ static void switch_to_thread (thread_info *thr) { gdb_assert (thr != NULL); if (inferior_ptid == thr->ptid) return; switch_to_thread_no_regs (thr); 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 (thr->state != THREAD_EXITED && !thr->executing) stop_pc = regcache_read_pc (get_thread_regcache (thr->ptid)); } /* See gdbthread.h. */ void switch_to_thread (ptid_t ptid) { if (ptid == null_ptid) switch_to_no_thread (); else switch_to_thread (find_thread_ptid (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); } } scoped_restore_current_thread::~scoped_restore_current_thread () { /* If an entry of thread_info was previously selected, it won't be deleted because we've increased its refcount. The thread represented by this thread_info entry may have already exited (due to normal exit, detach, etc), so the thread_info.state is THREAD_EXITED. */ if (m_thread != NULL /* If the previously selected thread belonged to a process that has in the mean time exited (or killed, detached, etc.), then don't revert back to it, but instead simply drop back to no thread selected. */ && m_inf->pid != 0) switch_to_thread (m_thread); else { switch_to_no_thread (); set_current_inferior (m_inf); } /* The running state of the originally selected thread may have changed, so we have to recheck it here. */ if (inferior_ptid != null_ptid && m_was_stopped && is_stopped (inferior_ptid) && target_has_registers && target_has_stack && target_has_memory) restore_selected_frame (m_selected_frame_id, m_selected_frame_level); if (m_thread != NULL) m_thread->decref (); m_inf->decref (); } scoped_restore_current_thread::scoped_restore_current_thread () { m_thread = NULL; m_inf = current_inferior (); if (inferior_ptid != null_ptid) { thread_info *tp = find_thread_ptid (inferior_ptid); struct frame_info *frame; gdb_assert (tp != NULL); m_was_stopped = tp->state == THREAD_STOPPED; if (m_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; m_selected_frame_id = get_frame_id (frame); m_selected_frame_level = frame_relative_level (frame); tp->incref (); m_thread = tp; } m_inf->incref (); } /* 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 true, tp_array_compar should sort in ascending order, otherwise in descending order. */ static bool 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 bool tp_array_compar (const thread_info *a, const thread_info *b) { if (a->inf->num != b->inf->num) { if (tp_array_compar_ascending) return a->inf->num < b->inf->num; else return a->inf->num > b->inf->num; } if (tp_array_compar_ascending) return (a->per_inf_num < b->per_inf_num); else return (a->per_inf_num > b->per_inf_num); } /* Apply a GDB command to a list of threads. List syntax is a whitespace separated list of numbers, or ranges, or the keyword `all'. Ranges consist of two numbers separated 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 x/i $pc Apply x/i $pc cmd to all threads. */ static void thread_apply_all_command (const char *cmd, int from_tty) { tp_array_compar_ascending = false; if (cmd != NULL && check_for_argument (&cmd, "-ascending", strlen ("-ascending"))) { cmd = skip_spaces (cmd); tp_array_compar_ascending = true; } if (cmd == NULL || *cmd == '\000') error (_("Please specify a command following the thread ID list")); update_thread_list (); int tc = live_threads_count (); if (tc != 0) { /* Save a copy of the thread list and increment each thread's refcount while executing the command in the context of each thread, in case the command is one that wipes threads. E.g., detach, kill, disconnect, etc., or even normally continuing over an inferior or thread exit. */ std::vector thr_list_cpy; thr_list_cpy.reserve (tc); { thread_info *tp; ALL_NON_EXITED_THREADS (tp) { thr_list_cpy.push_back (tp); } gdb_assert (thr_list_cpy.size () == tc); } /* Increment the refcounts, and restore them back on scope exit. */ scoped_inc_dec_ref inc_dec_ref (thr_list_cpy); std::sort (thr_list_cpy.begin (), thr_list_cpy.end (), tp_array_compar); scoped_restore_current_thread restore_thread; for (thread_info *thr : thr_list_cpy) if (thread_alive (thr)) { switch_to_thread (thr->ptid); printf_filtered (_("\nThread %s (%s):\n"), print_thread_id (thr), target_pid_to_str (inferior_ptid)); execute_command (cmd, from_tty); } } } /* Implementation of the "thread apply" command. */ static void thread_apply_command (const char *tidlist, int from_tty) { const char *cmd = NULL; 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 = 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); scoped_restore_current_thread restore_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); } } /* Switch to the specified thread, or print the current thread. */ void thread_command (const char *tidstr, int from_tty) { if (tidstr == NULL) { if (inferior_ptid == null_ptid) error (_("No thread selected")); if (target_has_stack) { struct thread_info *tp = inferior_thread (); if (is_exited (inferior_ptid)) printf_filtered (_("[Current thread is %s (%s) (exited)]\n"), print_thread_id (tp), target_pid_to_str (inferior_ptid)); else printf_filtered (_("[Current thread is %s (%s)]\n"), print_thread_id (tp), target_pid_to_str (inferior_ptid)); } else error (_("No stack.")); } else { ptid_t previous_ptid = inferior_ptid; thread_select (tidstr, parse_thread_id (tidstr, NULL)); /* Print if the thread has not changed, otherwise an event will be sent. */ if (inferior_ptid == previous_ptid) { print_selected_thread_frame (current_uiout, USER_SELECTED_THREAD | USER_SELECTED_FRAME); } else { gdb::observers::user_selected_context_changed.notify (USER_SELECTED_THREAD | USER_SELECTED_FRAME); } } } /* Implementation of `thread name'. */ static void thread_name_command (const char *arg, int from_tty) { struct thread_info *info; if (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 (const 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); } /* See gdbthread.h. */ void thread_select (const char *tidstr, thread_info *tp) { if (!thread_alive (tp)) error (_("Thread ID %s has terminated."), tidstr); switch_to_thread (tp->ptid); annotate_thread_changed (); /* Since the current thread may have changed, see if there is any exited thread we can now delete. */ prune_threads (); } /* Print thread and frame switch command response. */ void print_selected_thread_frame (struct ui_out *uiout, user_selected_what selection) { struct thread_info *tp = inferior_thread (); if (selection & USER_SELECTED_THREAD) { if (uiout->is_mi_like_p ()) { uiout->field_int ("new-thread-id", inferior_thread ()->global_num); } else { uiout->text ("[Switching to thread "); uiout->field_string ("new-thread-id", print_thread_id (tp)); uiout->text (" ("); uiout->text (target_pid_to_str (inferior_ptid)); uiout->text (")]"); } } if (tp->state == THREAD_RUNNING) { if (selection & USER_SELECTED_THREAD) uiout->text ("(running)\n"); } else if (selection & USER_SELECTED_FRAME) { if (selection & USER_SELECTED_THREAD) uiout->text ("\n"); if (has_stack_frames ()) print_stack_frame_to_uiout (uiout, get_selected_frame (NULL), 1, SRC_AND_LOC, 1); } } /* 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] \n\ -ascending: Call 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); }