| /* Multi-process/thread control for GDB, the GNU debugger. |
| |
| Copyright 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, |
| 1999, 2000, 2001, 2002, 2003 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #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 "gdb_string.h" |
| |
| #include <ctype.h> |
| #include <sys/types.h> |
| #include <signal.h> |
| #include "ui-out.h" |
| |
| /*#include "lynxos-core.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 switch_to_thread (ptid_t ptid); |
| static void prune_threads (void); |
| |
| 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. */ |
| if (tp->step_resume_breakpoint) |
| delete_breakpoint (tp->step_resume_breakpoint); |
| |
| /* 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; |
| } |
| |
| /* add_thread now returns a pointer to the new thread_info, |
| so that back_ends can initialize their private data. */ |
| |
| struct thread_info * |
| add_thread (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; |
| } |
| |
| 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) |
| { |
| return catch_exceptions (uiout, do_captured_list_thread_ids, NULL, |
| NULL, RETURN_MASK_ALL); |
| } |
| |
| /* 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, |
| struct breakpoint **through_sigtramp_breakpoint, |
| CORE_ADDR *step_range_start, |
| CORE_ADDR *step_range_end, |
| struct frame_id *step_frame_id, |
| int *handling_longjmp, |
| int *another_trap, |
| int *stepping_through_solib_after_catch, |
| bpstat *stepping_through_solib_catchpoints, |
| int *stepping_through_sigtramp, |
| int *current_line, |
| struct symtab **current_symtab, CORE_ADDR *step_sp) |
| { |
| 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; |
| *through_sigtramp_breakpoint = tp->through_sigtramp_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; |
| *another_trap = tp->another_trap; |
| *stepping_through_solib_after_catch = |
| tp->stepping_through_solib_after_catch; |
| *stepping_through_solib_catchpoints = |
| tp->stepping_through_solib_catchpoints; |
| *stepping_through_sigtramp = tp->stepping_through_sigtramp; |
| *current_line = tp->current_line; |
| *current_symtab = tp->current_symtab; |
| *step_sp = tp->step_sp; |
| } |
| |
| /* 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, |
| struct breakpoint *through_sigtramp_breakpoint, |
| CORE_ADDR step_range_start, |
| CORE_ADDR step_range_end, |
| const struct frame_id *step_frame_id, |
| int handling_longjmp, |
| int another_trap, |
| int stepping_through_solib_after_catch, |
| bpstat stepping_through_solib_catchpoints, |
| int stepping_through_sigtramp, |
| int current_line, |
| struct symtab *current_symtab, CORE_ADDR step_sp) |
| { |
| 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->through_sigtramp_breakpoint = through_sigtramp_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->another_trap = another_trap; |
| tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch; |
| tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints; |
| tp->stepping_through_sigtramp = stepping_through_sigtramp; |
| tp->current_line = current_line; |
| tp->current_symtab = current_symtab; |
| tp->step_sp = step_sp; |
| } |
| |
| /* 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; |
| int saved_frame_level = frame_relative_level (deprecated_selected_frame); |
| int counter; |
| char *extra_info; |
| |
| /* Avoid coredumps which would happen if we tried to access a NULL |
| deprecated_selected_frame. */ |
| if (!target_has_stack) |
| error ("No stack."); |
| |
| 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 (" "); |
| |
| #ifdef HPUXHPPA |
| printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid)); |
| #else |
| printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->ptid)); |
| #endif |
| |
| extra_info = target_extra_thread_info (tp); |
| if (extra_info) |
| printf_filtered (" (%s)", extra_info); |
| puts_filtered (" "); |
| |
| switch_to_thread (tp->ptid); |
| if (deprecated_selected_frame) |
| print_stack_frame (deprecated_selected_frame, -1, 0); |
| else |
| printf_filtered ("[No stack.]\n"); |
| } |
| |
| switch_to_thread (current_ptid); |
| |
| /* Code below copied from "up_silently_base" in "stack.c". |
| * It restores the frame set by the user before the "info threads" |
| * command. We have finished the info-threads display by switching |
| * back to the current thread. That switch has put us at the top |
| * of the stack (leaf frame). |
| */ |
| counter = saved_frame_level; |
| cur_frame = find_relative_frame (deprecated_selected_frame, &counter); |
| if (counter != 0) |
| { |
| /* Ooops, can't restore, tell user where we are. */ |
| warning ("Couldn't restore frame in current thread, at frame 0"); |
| print_stack_frame (deprecated_selected_frame, -1, 0); |
| } |
| else |
| { |
| select_frame (cur_frame); |
| } |
| |
| /* re-show current frame. */ |
| show_stack_frame (cur_frame); |
| } |
| |
| /* Switch from one thread to another. */ |
| |
| static void |
| switch_to_thread (ptid_t ptid) |
| { |
| if (ptid_equal (ptid, inferior_ptid)) |
| return; |
| |
| inferior_ptid = ptid; |
| flush_cached_frames (); |
| registers_changed (); |
| stop_pc = read_pc (); |
| select_frame (get_current_frame ()); |
| } |
| |
| static void |
| restore_current_thread (ptid_t ptid) |
| { |
| if (!ptid_equal (ptid, inferior_ptid)) |
| { |
| switch_to_thread (ptid); |
| print_stack_frame (get_current_frame (), 0, -1); |
| } |
| } |
| |
| struct current_thread_cleanup |
| { |
| ptid_t inferior_ptid; |
| }; |
| |
| static void |
| do_restore_current_thread_cleanup (void *arg) |
| { |
| struct current_thread_cleanup *old = arg; |
| restore_current_thread (old->inferior_ptid); |
| xfree (old); |
| } |
| |
| static struct cleanup * |
| make_cleanup_restore_current_thread (ptid_t inferior_ptid) |
| { |
| struct current_thread_cleanup *old |
| = xmalloc (sizeof (struct current_thread_cleanup)); |
| old->inferior_ptid = inferior_ptid; |
| 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; |
| |
| if (cmd == NULL || *cmd == '\000') |
| error ("Please specify a command following the thread ID list"); |
| |
| old_chain = make_cleanup_restore_current_thread (inferior_ptid); |
| |
| /* 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); |
| #ifdef HPUXHPPA |
| printf_filtered ("\nThread %d (%s):\n", |
| tp->num, target_tid_to_str (inferior_ptid)); |
| #else |
| printf_filtered ("\nThread %d (%s):\n", tp->num, |
| target_pid_to_str (inferior_ptid)); |
| #endif |
| execute_command (cmd, from_tty); |
| strcpy (cmd, saved_cmd); /* Restore exact command used previously */ |
| } |
| |
| do_cleanups (saved_cmd_cleanup_chain); |
| do_cleanups (old_chain); |
| } |
| |
| 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; |
| |
| 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"); |
| |
| old_chain = make_cleanup_restore_current_thread (inferior_ptid); |
| |
| /* 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); |
| #ifdef HPUXHPPA |
| printf_filtered ("\nThread %d (%s):\n", tp->num, |
| target_tid_to_str (inferior_ptid)); |
| #else |
| printf_filtered ("\nThread %d (%s):\n", tp->num, |
| target_pid_to_str (inferior_ptid)); |
| #endif |
| execute_command (cmd, from_tty); |
| strcpy (cmd, saved_cmd); /* Restore exact command used previously */ |
| } |
| } |
| } |
| |
| do_cleanups (saved_cmd_cleanup_chain); |
| do_cleanups (old_chain); |
| } |
| |
| /* Switch to the specified thread. Will dispatch off to thread_apply_command |
| if prefix of arg is `apply'. */ |
| |
| static void |
| thread_command (char *tidstr, int from_tty) |
| { |
| if (!tidstr) |
| { |
| /* 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), |
| #if defined(HPUXHPPA) |
| target_tid_to_str (inferior_ptid) |
| #else |
| target_pid_to_str (inferior_ptid) |
| #endif |
| ); |
| else |
| error ("No stack."); |
| return; |
| } |
| |
| gdb_thread_select (uiout, tidstr); |
| } |
| |
| 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.\n", 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, " ("); |
| #if defined(HPUXHPPA) |
| ui_out_text (uiout, target_tid_to_str (inferior_ptid)); |
| #else |
| ui_out_text (uiout, target_pid_to_str (inferior_ptid)); |
| #endif |
| ui_out_text (uiout, ")]"); |
| |
| print_stack_frame (deprecated_selected_frame, |
| frame_relative_level (deprecated_selected_frame), 1); |
| return GDB_RC_OK; |
| } |
| |
| enum gdb_rc |
| gdb_thread_select (struct ui_out *uiout, char *tidstr) |
| { |
| return catch_exceptions (uiout, do_captured_thread_select, tidstr, |
| NULL, RETURN_MASK_ALL); |
| } |
| |
| /* 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, "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); |
| } |