URL
https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk
Subversion Repositories openrisc_me
[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [thread.c] - Rev 308
Go to most recent revision | Compare with Previous | Blame | View Log
/* Multi-process/thread control for GDB, the GNU debugger. Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008 Free Software Foundation, Inc. Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "symtab.h" #include "frame.h" #include "inferior.h" #include "environ.h" #include "value.h" #include "target.h" #include "gdbthread.h" #include "exceptions.h" #include "command.h" #include "gdbcmd.h" #include "regcache.h" #include "gdb.h" #include "gdb_string.h" #include <ctype.h> #include <sys/types.h> #include <signal.h> #include "ui-out.h" /* Definition of struct thread_info exported to gdbthread.h */ /* Prototypes for exported functions. */ void _initialize_thread (void); /* Prototypes for local functions. */ static struct thread_info *thread_list = NULL; static int highest_thread_num; static struct thread_info *find_thread_id (int num); static void thread_command (char *tidstr, int from_tty); static void thread_apply_all_command (char *, int); static int thread_alive (struct thread_info *); static void info_threads_command (char *, int); static void thread_apply_command (char *, int); static void restore_current_thread (ptid_t); static void prune_threads (void); static struct cleanup *make_cleanup_restore_current_thread (ptid_t, struct frame_id); void delete_step_resume_breakpoint (void *arg) { struct breakpoint **breakpointp = (struct breakpoint **) arg; struct thread_info *tp; if (*breakpointp != NULL) { delete_breakpoint (*breakpointp); for (tp = thread_list; tp; tp = tp->next) if (tp->step_resume_breakpoint == *breakpointp) tp->step_resume_breakpoint = NULL; *breakpointp = NULL; } } static void free_thread (struct thread_info *tp) { /* NOTE: this will take care of any left-over step_resume breakpoints, but not any user-specified thread-specific breakpoints. We can not delete the breakpoint straight-off, because the inferior might not be stopped at the moment. */ if (tp->step_resume_breakpoint) tp->step_resume_breakpoint->disposition = disp_del_at_next_stop; /* FIXME: do I ever need to call the back-end to give it a chance at this private data before deleting the thread? */ if (tp->private) xfree (tp->private); xfree (tp); } void init_thread_list (void) { struct thread_info *tp, *tpnext; highest_thread_num = 0; if (!thread_list) return; for (tp = thread_list; tp; tp = tpnext) { tpnext = tp->next; free_thread (tp); } thread_list = NULL; } struct thread_info * add_thread_silent (ptid_t ptid) { struct thread_info *tp; tp = (struct thread_info *) xmalloc (sizeof (*tp)); memset (tp, 0, sizeof (*tp)); tp->ptid = ptid; tp->num = ++highest_thread_num; tp->next = thread_list; thread_list = tp; return tp; } struct thread_info * add_thread (ptid_t ptid) { struct thread_info *result = add_thread_silent (ptid); if (print_thread_events) printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid)); return result; } void delete_thread (ptid_t ptid) { struct thread_info *tp, *tpprev; tpprev = NULL; for (tp = thread_list; tp; tpprev = tp, tp = tp->next) if (ptid_equal (tp->ptid, ptid)) break; if (!tp) return; if (tpprev) tpprev->next = tp->next; else thread_list = tp->next; free_thread (tp); } static struct thread_info * find_thread_id (int num) { struct thread_info *tp; for (tp = thread_list; tp; tp = tp->next) if (tp->num == num) return tp; return NULL; } /* Find a thread_info by matching PTID. */ struct thread_info * find_thread_pid (ptid_t ptid) { struct thread_info *tp; for (tp = thread_list; tp; tp = tp->next) if (ptid_equal (tp->ptid, ptid)) return tp; return NULL; } /* * Thread iterator function. * * Calls a callback function once for each thread, so long as * the callback function returns false. If the callback function * returns true, the iteration will end and the current thread * will be returned. This can be useful for implementing a * search for a thread with arbitrary attributes, or for applying * some operation to every thread. * * FIXME: some of the existing functionality, such as * "Thread apply all", might be rewritten using this functionality. */ struct thread_info * iterate_over_threads (int (*callback) (struct thread_info *, void *), void *data) { struct thread_info *tp; for (tp = thread_list; tp; tp = tp->next) if ((*callback) (tp, data)) return tp; return NULL; } int valid_thread_id (int num) { struct thread_info *tp; for (tp = thread_list; tp; tp = tp->next) if (tp->num == num) return 1; return 0; } int pid_to_thread_id (ptid_t ptid) { struct thread_info *tp; for (tp = thread_list; tp; tp = tp->next) if (ptid_equal (tp->ptid, ptid)) return tp->num; return 0; } ptid_t thread_id_to_pid (int num) { struct thread_info *thread = find_thread_id (num); if (thread) return thread->ptid; else return pid_to_ptid (-1); } int in_thread_list (ptid_t ptid) { struct thread_info *tp; for (tp = thread_list; tp; tp = tp->next) if (ptid_equal (tp->ptid, ptid)) return 1; return 0; /* Never heard of 'im */ } /* 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; prune_threads (); target_find_new_threads (); cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids"); for (tp = thread_list; tp; tp = tp->next) { num++; ui_out_field_int (uiout, "thread-id", tp->num); } do_cleanups (cleanup_chain); ui_out_field_int (uiout, "number-of-threads", num); return GDB_RC_OK; } /* Official gdblib interface function to get a list of thread ids and the total number. */ enum gdb_rc gdb_list_thread_ids (struct ui_out *uiout, char **error_message) { if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL, error_message, RETURN_MASK_ALL) < 0) return GDB_RC_FAIL; return GDB_RC_OK; } /* Load infrun state for the thread PID. */ void load_infrun_state (ptid_t ptid, CORE_ADDR *prev_pc, int *trap_expected, struct breakpoint **step_resume_breakpoint, CORE_ADDR *step_range_start, CORE_ADDR *step_range_end, struct frame_id *step_frame_id, int *handling_longjmp, int *stepping_over_breakpoint, int *stepping_through_solib_after_catch, bpstat *stepping_through_solib_catchpoints, int *current_line, struct symtab **current_symtab) { struct thread_info *tp; /* If we can't find the thread, then we're debugging a single threaded process. No need to do anything in that case. */ tp = find_thread_id (pid_to_thread_id (ptid)); if (tp == NULL) return; *prev_pc = tp->prev_pc; *trap_expected = tp->trap_expected; *step_resume_breakpoint = tp->step_resume_breakpoint; *step_range_start = tp->step_range_start; *step_range_end = tp->step_range_end; *step_frame_id = tp->step_frame_id; *handling_longjmp = tp->handling_longjmp; *stepping_over_breakpoint = tp->stepping_over_breakpoint; *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch; *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints; *current_line = tp->current_line; *current_symtab = tp->current_symtab; } /* Save infrun state for the thread PID. */ void save_infrun_state (ptid_t ptid, CORE_ADDR prev_pc, int trap_expected, struct breakpoint *step_resume_breakpoint, CORE_ADDR step_range_start, CORE_ADDR step_range_end, const struct frame_id *step_frame_id, int handling_longjmp, int stepping_over_breakpoint, int stepping_through_solib_after_catch, bpstat stepping_through_solib_catchpoints, int current_line, struct symtab *current_symtab) { struct thread_info *tp; /* If we can't find the thread, then we're debugging a single-threaded process. Nothing to do in that case. */ tp = find_thread_id (pid_to_thread_id (ptid)); if (tp == NULL) return; tp->prev_pc = prev_pc; tp->trap_expected = trap_expected; tp->step_resume_breakpoint = step_resume_breakpoint; tp->step_range_start = step_range_start; tp->step_range_end = step_range_end; tp->step_frame_id = (*step_frame_id); tp->handling_longjmp = handling_longjmp; tp->stepping_over_breakpoint = stepping_over_breakpoint; tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch; tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints; tp->current_line = current_line; tp->current_symtab = current_symtab; } /* Return true if TP is an active thread. */ static int thread_alive (struct thread_info *tp) { if (PIDGET (tp->ptid) == -1) return 0; if (!target_thread_alive (tp->ptid)) { tp->ptid = pid_to_ptid (-1); /* Mark it as dead */ return 0; } return 1; } static void prune_threads (void) { struct thread_info *tp, *next; for (tp = thread_list; tp; tp = next) { next = tp->next; if (!thread_alive (tp)) delete_thread (tp->ptid); } } /* Print information about currently known threads * Note: this has the drawback that it _really_ switches * threads, which frees the frame cache. A no-side * effects info-threads command would be nicer. */ static void info_threads_command (char *arg, int from_tty) { struct thread_info *tp; ptid_t current_ptid; struct frame_info *cur_frame; struct cleanup *old_chain; struct frame_id saved_frame_id; char *extra_info; /* Backup current thread and selected frame. */ saved_frame_id = get_frame_id (get_selected_frame (NULL)); old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id); prune_threads (); target_find_new_threads (); current_ptid = inferior_ptid; for (tp = thread_list; tp; tp = tp->next) { if (ptid_equal (tp->ptid, current_ptid)) printf_filtered ("* "); else printf_filtered (" "); printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid)); extra_info = target_extra_thread_info (tp); if (extra_info) printf_filtered (" (%s)", extra_info); puts_filtered (" "); /* That switch put us at the top of the stack (leaf frame). */ switch_to_thread (tp->ptid); print_stack_frame (get_selected_frame (NULL), 0, LOCATION); } /* Restores the current thread and the frame selected before the "info threads" command. */ do_cleanups (old_chain); /* If case we were not able to find the original frame, print the new selected frame. */ if (frame_find_by_id (saved_frame_id) == NULL) { warning (_("Couldn't restore frame in current thread, at frame 0")); print_stack_frame (get_selected_frame (NULL), 0, LOCATION); } } /* Switch from one thread to another. */ void switch_to_thread (ptid_t ptid) { if (ptid_equal (ptid, inferior_ptid)) return; inferior_ptid = ptid; reinit_frame_cache (); registers_changed (); stop_pc = read_pc (); } static void restore_current_thread (ptid_t ptid) { if (!ptid_equal (ptid, inferior_ptid)) { switch_to_thread (ptid); } } static void restore_selected_frame (struct frame_id a_frame_id) { struct frame_info *selected_frame_info = NULL; if (frame_id_eq (a_frame_id, null_frame_id)) return; if ((selected_frame_info = frame_find_by_id (a_frame_id)) != NULL) { select_frame (selected_frame_info); } } struct current_thread_cleanup { ptid_t inferior_ptid; struct frame_id selected_frame_id; }; static void do_restore_current_thread_cleanup (void *arg) { struct current_thread_cleanup *old = arg; restore_current_thread (old->inferior_ptid); restore_selected_frame (old->selected_frame_id); xfree (old); } static struct cleanup * make_cleanup_restore_current_thread (ptid_t inferior_ptid, struct frame_id a_frame_id) { struct current_thread_cleanup *old = xmalloc (sizeof (struct current_thread_cleanup)); old->inferior_ptid = inferior_ptid; old->selected_frame_id = a_frame_id; return make_cleanup (do_restore_current_thread_cleanup, old); } /* Apply a GDB command to a list of threads. List syntax is a whitespace seperated list of numbers, or ranges, or the keyword `all'. Ranges consist of two numbers seperated by a hyphen. Examples: thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9 thread apply all p x/i $pc Apply x/i $pc cmd to all threads */ static void thread_apply_all_command (char *cmd, int from_tty) { struct thread_info *tp; struct cleanup *old_chain; struct cleanup *saved_cmd_cleanup_chain; char *saved_cmd; struct frame_id saved_frame_id; ptid_t current_ptid; int thread_has_changed = 0; if (cmd == NULL || *cmd == '\000') error (_("Please specify a command following the thread ID list")); current_ptid = inferior_ptid; saved_frame_id = get_frame_id (get_selected_frame (NULL)); old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id); /* It is safe to update the thread list now, before traversing it for "thread apply all". MVS */ target_find_new_threads (); /* Save a copy of the command in case it is clobbered by execute_command */ saved_cmd = xstrdup (cmd); saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd); for (tp = thread_list; tp; tp = tp->next) if (thread_alive (tp)) { switch_to_thread (tp->ptid); printf_filtered (_("\nThread %d (%s):\n"), tp->num, target_tid_to_str (inferior_ptid)); execute_command (cmd, from_tty); strcpy (cmd, saved_cmd); /* Restore exact command used previously */ } if (!ptid_equal (current_ptid, inferior_ptid)) thread_has_changed = 1; do_cleanups (saved_cmd_cleanup_chain); do_cleanups (old_chain); /* Print stack frame only if we changed thread. */ if (thread_has_changed) print_stack_frame (get_current_frame (), 1, SRC_LINE); } static void thread_apply_command (char *tidlist, int from_tty) { char *cmd; char *p; struct cleanup *old_chain; struct cleanup *saved_cmd_cleanup_chain; char *saved_cmd; struct frame_id saved_frame_id; ptid_t current_ptid; int thread_has_changed = 0; if (tidlist == NULL || *tidlist == '\000') error (_("Please specify a thread ID list")); for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++); if (*cmd == '\000') error (_("Please specify a command following the thread ID list")); current_ptid = inferior_ptid; saved_frame_id = get_frame_id (get_selected_frame (NULL)); old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id); /* Save a copy of the command in case it is clobbered by execute_command */ saved_cmd = xstrdup (cmd); saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd); while (tidlist < cmd) { struct thread_info *tp; int start, end; start = strtol (tidlist, &p, 10); if (p == tidlist) error (_("Error parsing %s"), tidlist); tidlist = p; while (*tidlist == ' ' || *tidlist == '\t') tidlist++; if (*tidlist == '-') /* Got a range of IDs? */ { tidlist++; /* Skip the - */ end = strtol (tidlist, &p, 10); if (p == tidlist) error (_("Error parsing %s"), tidlist); tidlist = p; while (*tidlist == ' ' || *tidlist == '\t') tidlist++; } else end = start; for (; start <= end; start++) { tp = find_thread_id (start); if (!tp) warning (_("Unknown thread %d."), start); else if (!thread_alive (tp)) warning (_("Thread %d has terminated."), start); else { switch_to_thread (tp->ptid); printf_filtered (_("\nThread %d (%s):\n"), tp->num, target_tid_to_str (inferior_ptid)); execute_command (cmd, from_tty); strcpy (cmd, saved_cmd); /* Restore exact command used previously */ } } } if (!ptid_equal (current_ptid, inferior_ptid)) thread_has_changed = 1; do_cleanups (saved_cmd_cleanup_chain); do_cleanups (old_chain); /* Print stack frame only if we changed thread. */ if (thread_has_changed) print_stack_frame (get_current_frame (), 1, SRC_LINE); } /* Switch to the specified thread. Will dispatch off to thread_apply_command if prefix of arg is `apply'. */ static void thread_command (char *tidstr, int from_tty) { if (!tidstr) { /* Don't generate an error, just say which thread is current. */ if (target_has_stack) printf_filtered (_("[Current thread is %d (%s)]\n"), pid_to_thread_id (inferior_ptid), target_tid_to_str (inferior_ptid)); else error (_("No stack.")); return; } gdb_thread_select (uiout, tidstr, NULL); } /* Print notices when new threads are attached and detached. */ int print_thread_events = 1; static void show_print_thread_events (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { fprintf_filtered (file, _("\ Printing of thread events is %s.\n"), value); } static int do_captured_thread_select (struct ui_out *uiout, void *tidstr) { int num; struct thread_info *tp; num = value_as_long (parse_and_eval (tidstr)); tp = find_thread_id (num); if (!tp) error (_("Thread ID %d not known."), num); if (!thread_alive (tp)) error (_("Thread ID %d has terminated."), num); switch_to_thread (tp->ptid); ui_out_text (uiout, "[Switching to thread "); ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid)); ui_out_text (uiout, " ("); ui_out_text (uiout, target_tid_to_str (inferior_ptid)); ui_out_text (uiout, ")]"); print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); return GDB_RC_OK; } enum gdb_rc gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message) { if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr, error_message, RETURN_MASK_ALL) < 0) return GDB_RC_FAIL; return GDB_RC_OK; } /* Commands with a prefix of `thread'. */ struct cmd_list_element *thread_cmd_list = NULL; void _initialize_thread (void) { static struct cmd_list_element *thread_apply_list = NULL; add_info ("threads", info_threads_command, _("IDs of currently known threads.")); add_prefix_cmd ("thread", class_run, thread_command, _("\ Use this command to switch between threads.\n\ The new thread ID must be currently known."), &thread_cmd_list, "thread ", 1, &cmdlist); add_prefix_cmd ("apply", class_run, thread_apply_command, _("Apply a command to a list of threads."), &thread_apply_list, "thread apply ", 1, &thread_cmd_list); add_cmd ("all", class_run, thread_apply_all_command, _("Apply a command to all threads."), &thread_apply_list); if (!xdb_commands) add_com_alias ("t", "thread", class_run, 1); add_setshow_boolean_cmd ("thread-events", no_class, &print_thread_events, _("\ Set printing of thread events (e.g., thread start and exit)."), _("\ Show printing of thread events (e.g., thread start and exit)."), NULL, NULL, show_print_thread_events, &setprintlist, &showprintlist); }
Go to most recent revision | Compare with Previous | Blame | View Log