Create new file regcache.h. Update all uses.
[deliverable/binutils-gdb.git] / gdb / thread.c
1 /* Multi-process/thread control for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1988, 1993, 1998, 1999, 2000, 2001
3
4 Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
5 Free Software Foundation, Inc.
6
7 This file is part of GDB.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
23
24 #include "defs.h"
25 #include "symtab.h"
26 #include "frame.h"
27 #include "inferior.h"
28 #include "environ.h"
29 #include "value.h"
30 #include "target.h"
31 #include "gdbthread.h"
32 #include "command.h"
33 #include "gdbcmd.h"
34 #include "regcache.h"
35
36 #include <ctype.h>
37 #include <sys/types.h>
38 #include <signal.h>
39 #ifdef UI_OUT
40 #include "ui-out.h"
41 #endif
42
43 /*#include "lynxos-core.h" */
44
45 /* Definition of struct thread_info exported to gdbthread.h */
46
47 /* Prototypes for exported functions. */
48
49 void _initialize_thread (void);
50
51 /* Prototypes for local functions. */
52
53 static struct thread_info *thread_list = NULL;
54 static int highest_thread_num;
55
56 static struct thread_info *find_thread_id (int num);
57
58 static void thread_command (char *tidstr, int from_tty);
59 static void thread_apply_all_command (char *, int);
60 static int thread_alive (struct thread_info *);
61 static void info_threads_command (char *, int);
62 static void thread_apply_command (char *, int);
63 static void restore_current_thread (int);
64 static void switch_to_thread (int pid);
65 static void prune_threads (void);
66
67 static void
68 free_thread (struct thread_info *tp)
69 {
70 /* NOTE: this will take care of any left-over step_resume breakpoints,
71 but not any user-specified thread-specific breakpoints. */
72 if (tp->step_resume_breakpoint)
73 delete_breakpoint (tp->step_resume_breakpoint);
74
75 /* FIXME: do I ever need to call the back-end to give it a
76 chance at this private data before deleting the thread? */
77 if (tp->private)
78 xfree (tp->private);
79
80 xfree (tp);
81 }
82
83 void
84 init_thread_list (void)
85 {
86 struct thread_info *tp, *tpnext;
87
88 highest_thread_num = 0;
89 if (!thread_list)
90 return;
91
92 for (tp = thread_list; tp; tp = tpnext)
93 {
94 tpnext = tp->next;
95 free_thread (tp);
96 }
97
98 thread_list = NULL;
99 }
100
101 /* add_thread now returns a pointer to the new thread_info,
102 so that back_ends can initialize their private data. */
103
104 struct thread_info *
105 add_thread (int pid)
106 {
107 struct thread_info *tp;
108
109 tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
110
111 tp->pid = pid;
112 tp->num = ++highest_thread_num;
113 tp->prev_pc = 0;
114 tp->prev_func_start = 0;
115 tp->prev_func_name = NULL;
116 tp->step_range_start = 0;
117 tp->step_range_end = 0;
118 tp->step_frame_address = 0;
119 tp->step_resume_breakpoint = 0;
120 tp->through_sigtramp_breakpoint = 0;
121 tp->handling_longjmp = 0;
122 tp->trap_expected = 0;
123 tp->another_trap = 0;
124 tp->stepping_through_solib_after_catch = 0;
125 tp->stepping_through_solib_catchpoints = NULL;
126 tp->stepping_through_sigtramp = 0;
127 tp->next = thread_list;
128 tp->private = NULL;
129 thread_list = tp;
130 return tp;
131 }
132
133 void
134 delete_thread (int pid)
135 {
136 struct thread_info *tp, *tpprev;
137
138 tpprev = NULL;
139
140 for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
141 if (tp->pid == pid)
142 break;
143
144 if (!tp)
145 return;
146
147 if (tpprev)
148 tpprev->next = tp->next;
149 else
150 thread_list = tp->next;
151
152 free_thread (tp);
153 }
154
155 static struct thread_info *
156 find_thread_id (int num)
157 {
158 struct thread_info *tp;
159
160 for (tp = thread_list; tp; tp = tp->next)
161 if (tp->num == num)
162 return tp;
163
164 return NULL;
165 }
166
167 /* Find a thread_info by matching 'pid'. */
168 struct thread_info *
169 find_thread_pid (int pid)
170 {
171 struct thread_info *tp;
172
173 for (tp = thread_list; tp; tp = tp->next)
174 if (tp->pid == pid)
175 return tp;
176
177 return NULL;
178 }
179
180 /*
181 * Thread iterator function.
182 *
183 * Calls a callback function once for each thread, so long as
184 * the callback function returns false. If the callback function
185 * returns true, the iteration will end and the current thread
186 * will be returned. This can be useful for implementing a
187 * search for a thread with arbitrary attributes, or for applying
188 * some operation to every thread.
189 *
190 * FIXME: some of the existing functionality, such as
191 * "Thread apply all", might be rewritten using this functionality.
192 */
193
194 struct thread_info *
195 iterate_over_threads (int (*callback) (struct thread_info *, void *),
196 void *data)
197 {
198 struct thread_info *tp;
199
200 for (tp = thread_list; tp; tp = tp->next)
201 if ((*callback) (tp, data))
202 return tp;
203
204 return NULL;
205 }
206
207 int
208 valid_thread_id (int num)
209 {
210 struct thread_info *tp;
211
212 for (tp = thread_list; tp; tp = tp->next)
213 if (tp->num == num)
214 return 1;
215
216 return 0;
217 }
218
219 int
220 pid_to_thread_id (int pid)
221 {
222 struct thread_info *tp;
223
224 for (tp = thread_list; tp; tp = tp->next)
225 if (tp->pid == pid)
226 return tp->num;
227
228 return 0;
229 }
230
231 int
232 thread_id_to_pid (int num)
233 {
234 struct thread_info *thread = find_thread_id (num);
235 if (thread)
236 return thread->pid;
237 else
238 return -1;
239 }
240
241 int
242 in_thread_list (int pid)
243 {
244 struct thread_info *tp;
245
246 for (tp = thread_list; tp; tp = tp->next)
247 if (tp->pid == pid)
248 return 1;
249
250 return 0; /* Never heard of 'im */
251 }
252 #ifdef UI_OUT
253 /* Print a list of thread ids currently known, and the total number of
254 threads. To be used from within catch_errors. */
255 static int
256 do_captured_list_thread_ids (void *arg)
257 {
258 struct thread_info *tp;
259 int num = 0;
260
261 ui_out_list_begin (uiout, "thread-ids");
262
263 for (tp = thread_list; tp; tp = tp->next)
264 {
265 num++;
266 ui_out_field_int (uiout, "thread-id", tp->num);
267 }
268
269 ui_out_list_end (uiout);
270 ui_out_field_int (uiout, "number-of-threads", num);
271 return GDB_RC_OK;
272 }
273
274 /* Official gdblib interface function to get a list of thread ids and
275 the total number. */
276 enum gdb_rc
277 gdb_list_thread_ids (/* output object */)
278 {
279 return catch_errors (do_captured_list_thread_ids, NULL,
280 NULL, RETURN_MASK_ALL);
281 }
282 #endif
283
284 /* Load infrun state for the thread PID. */
285
286 void
287 load_infrun_state (int pid, CORE_ADDR *prev_pc, CORE_ADDR *prev_func_start,
288 char **prev_func_name, int *trap_expected,
289 struct breakpoint **step_resume_breakpoint,
290 struct breakpoint **through_sigtramp_breakpoint,
291 CORE_ADDR *step_range_start, CORE_ADDR *step_range_end,
292 CORE_ADDR *step_frame_address, int *handling_longjmp,
293 int *another_trap, int *stepping_through_solib_after_catch,
294 bpstat *stepping_through_solib_catchpoints,
295 int *stepping_through_sigtramp)
296 {
297 struct thread_info *tp;
298
299 /* If we can't find the thread, then we're debugging a single threaded
300 process. No need to do anything in that case. */
301 tp = find_thread_id (pid_to_thread_id (pid));
302 if (tp == NULL)
303 return;
304
305 *prev_pc = tp->prev_pc;
306 *prev_func_start = tp->prev_func_start;
307 *prev_func_name = tp->prev_func_name;
308 *step_resume_breakpoint = tp->step_resume_breakpoint;
309 *step_range_start = tp->step_range_start;
310 *step_range_end = tp->step_range_end;
311 *step_frame_address = tp->step_frame_address;
312 *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
313 *handling_longjmp = tp->handling_longjmp;
314 *trap_expected = tp->trap_expected;
315 *another_trap = tp->another_trap;
316 *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;
317 *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;
318 *stepping_through_sigtramp = tp->stepping_through_sigtramp;
319 }
320
321 /* Save infrun state for the thread PID. */
322
323 void
324 save_infrun_state (int pid, CORE_ADDR prev_pc, CORE_ADDR prev_func_start,
325 char *prev_func_name, int trap_expected,
326 struct breakpoint *step_resume_breakpoint,
327 struct breakpoint *through_sigtramp_breakpoint,
328 CORE_ADDR step_range_start, CORE_ADDR step_range_end,
329 CORE_ADDR step_frame_address, int handling_longjmp,
330 int another_trap, int stepping_through_solib_after_catch,
331 bpstat stepping_through_solib_catchpoints,
332 int stepping_through_sigtramp)
333 {
334 struct thread_info *tp;
335
336 /* If we can't find the thread, then we're debugging a single-threaded
337 process. Nothing to do in that case. */
338 tp = find_thread_id (pid_to_thread_id (pid));
339 if (tp == NULL)
340 return;
341
342 tp->prev_pc = prev_pc;
343 tp->prev_func_start = prev_func_start;
344 tp->prev_func_name = prev_func_name;
345 tp->step_resume_breakpoint = step_resume_breakpoint;
346 tp->step_range_start = step_range_start;
347 tp->step_range_end = step_range_end;
348 tp->step_frame_address = step_frame_address;
349 tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
350 tp->handling_longjmp = handling_longjmp;
351 tp->trap_expected = trap_expected;
352 tp->another_trap = another_trap;
353 tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
354 tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
355 tp->stepping_through_sigtramp = stepping_through_sigtramp;
356 }
357
358 /* Return true if TP is an active thread. */
359 static int
360 thread_alive (struct thread_info *tp)
361 {
362 if (tp->pid == -1)
363 return 0;
364 if (!target_thread_alive (tp->pid))
365 {
366 tp->pid = -1; /* Mark it as dead */
367 return 0;
368 }
369 return 1;
370 }
371
372 static void
373 prune_threads (void)
374 {
375 struct thread_info *tp, *next;
376
377 for (tp = thread_list; tp; tp = next)
378 {
379 next = tp->next;
380 if (!thread_alive (tp))
381 delete_thread (tp->pid);
382 }
383 }
384
385 /* Print information about currently known threads
386
387 * Note: this has the drawback that it _really_ switches
388 * threads, which frees the frame cache. A no-side
389 * effects info-threads command would be nicer.
390 */
391
392 static void
393 info_threads_command (char *arg, int from_tty)
394 {
395 struct thread_info *tp;
396 int current_pid;
397 struct frame_info *cur_frame;
398 int saved_frame_level = selected_frame_level;
399 int counter;
400 char *extra_info;
401
402 /* Avoid coredumps which would happen if we tried to access a NULL
403 selected_frame. */
404 if (!target_has_stack)
405 error ("No stack.");
406
407 prune_threads ();
408 target_find_new_threads ();
409 current_pid = inferior_pid;
410 for (tp = thread_list; tp; tp = tp->next)
411 {
412 if (tp->pid == current_pid)
413 printf_filtered ("* ");
414 else
415 printf_filtered (" ");
416
417 #ifdef HPUXHPPA
418 printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->pid));
419 #else
420 printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->pid));
421 #endif
422
423 extra_info = target_extra_thread_info (tp);
424 if (extra_info)
425 printf_filtered (" (%s)", extra_info);
426 puts_filtered (" ");
427
428 switch_to_thread (tp->pid);
429 if (selected_frame)
430 print_only_stack_frame (selected_frame, -1, 0);
431 else
432 printf_filtered ("[No stack.]\n");
433 }
434
435 switch_to_thread (current_pid);
436
437 /* Code below copied from "up_silently_base" in "stack.c".
438 * It restores the frame set by the user before the "info threads"
439 * command. We have finished the info-threads display by switching
440 * back to the current thread. That switch has put us at the top
441 * of the stack (leaf frame).
442 */
443 counter = saved_frame_level;
444 cur_frame = find_relative_frame (selected_frame, &counter);
445 if (counter != 0)
446 {
447 /* Ooops, can't restore, tell user where we are. */
448 warning ("Couldn't restore frame in current thread, at frame 0");
449 print_stack_frame (selected_frame, -1, 0);
450 }
451 else
452 {
453 select_frame (cur_frame, saved_frame_level);
454 }
455
456 /* re-show current frame. */
457 show_stack_frame (cur_frame);
458 }
459
460 /* Switch from one thread to another. */
461
462 static void
463 switch_to_thread (int pid)
464 {
465 if (pid == inferior_pid)
466 return;
467
468 inferior_pid = pid;
469 flush_cached_frames ();
470 registers_changed ();
471 stop_pc = read_pc ();
472 select_frame (get_current_frame (), 0);
473 }
474
475 static void
476 restore_current_thread (int pid)
477 {
478 if (pid != inferior_pid)
479 {
480 switch_to_thread (pid);
481 print_stack_frame (get_current_frame (), 0, -1);
482 }
483 }
484
485 struct current_thread_cleanup
486 {
487 int inferior_pid;
488 };
489
490 static void
491 do_restore_current_thread_cleanup (void *arg)
492 {
493 struct current_thread_cleanup *old = arg;
494 restore_current_thread (old->inferior_pid);
495 xfree (old);
496 }
497
498 static struct cleanup *
499 make_cleanup_restore_current_thread (int inferior_pid)
500 {
501 struct current_thread_cleanup *old
502 = xmalloc (sizeof (struct current_thread_cleanup));
503 old->inferior_pid = inferior_pid;
504 return make_cleanup (do_restore_current_thread_cleanup, old);
505 }
506
507 /* Apply a GDB command to a list of threads. List syntax is a whitespace
508 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
509 of two numbers seperated by a hyphen. Examples:
510
511 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
512 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
513 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
514 */
515
516 static void
517 thread_apply_all_command (char *cmd, int from_tty)
518 {
519 struct thread_info *tp;
520 struct cleanup *old_chain;
521 struct cleanup *saved_cmd_cleanup_chain;
522 char *saved_cmd;
523
524 if (cmd == NULL || *cmd == '\000')
525 error ("Please specify a command following the thread ID list");
526
527 old_chain = make_cleanup_restore_current_thread (inferior_pid);
528
529 /* It is safe to update the thread list now, before
530 traversing it for "thread apply all". MVS */
531 target_find_new_threads ();
532
533 /* Save a copy of the command in case it is clobbered by
534 execute_command */
535 saved_cmd = xstrdup (cmd);
536 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
537 for (tp = thread_list; tp; tp = tp->next)
538 if (thread_alive (tp))
539 {
540 switch_to_thread (tp->pid);
541 #ifdef HPUXHPPA
542 printf_filtered ("\nThread %d (%s):\n",
543 tp->num,
544 target_tid_to_str (inferior_pid));
545 #else
546 printf_filtered ("\nThread %d (%s):\n", tp->num,
547 target_pid_to_str (inferior_pid));
548 #endif
549 execute_command (cmd, from_tty);
550 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
551 }
552
553 do_cleanups (saved_cmd_cleanup_chain);
554 do_cleanups (old_chain);
555 }
556
557 static void
558 thread_apply_command (char *tidlist, int from_tty)
559 {
560 char *cmd;
561 char *p;
562 struct cleanup *old_chain;
563 struct cleanup *saved_cmd_cleanup_chain;
564 char *saved_cmd;
565
566 if (tidlist == NULL || *tidlist == '\000')
567 error ("Please specify a thread ID list");
568
569 for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
570
571 if (*cmd == '\000')
572 error ("Please specify a command following the thread ID list");
573
574 old_chain = make_cleanup_restore_current_thread (inferior_pid);
575
576 /* Save a copy of the command in case it is clobbered by
577 execute_command */
578 saved_cmd = xstrdup (cmd);
579 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
580 while (tidlist < cmd)
581 {
582 struct thread_info *tp;
583 int start, end;
584
585 start = strtol (tidlist, &p, 10);
586 if (p == tidlist)
587 error ("Error parsing %s", tidlist);
588 tidlist = p;
589
590 while (*tidlist == ' ' || *tidlist == '\t')
591 tidlist++;
592
593 if (*tidlist == '-') /* Got a range of IDs? */
594 {
595 tidlist++; /* Skip the - */
596 end = strtol (tidlist, &p, 10);
597 if (p == tidlist)
598 error ("Error parsing %s", tidlist);
599 tidlist = p;
600
601 while (*tidlist == ' ' || *tidlist == '\t')
602 tidlist++;
603 }
604 else
605 end = start;
606
607 for (; start <= end; start++)
608 {
609 tp = find_thread_id (start);
610
611 if (!tp)
612 warning ("Unknown thread %d.", start);
613 else if (!thread_alive (tp))
614 warning ("Thread %d has terminated.", start);
615 else
616 {
617 switch_to_thread (tp->pid);
618 #ifdef HPUXHPPA
619 printf_filtered ("\nThread %d (%s):\n", tp->num,
620 target_tid_to_str (inferior_pid));
621 #else
622 printf_filtered ("\nThread %d (%s):\n", tp->num,
623 target_pid_to_str (inferior_pid));
624 #endif
625 execute_command (cmd, from_tty);
626 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
627 }
628 }
629 }
630
631 do_cleanups (saved_cmd_cleanup_chain);
632 do_cleanups (old_chain);
633 }
634
635 /* Switch to the specified thread. Will dispatch off to thread_apply_command
636 if prefix of arg is `apply'. */
637
638 static void
639 thread_command (char *tidstr, int from_tty)
640 {
641 if (!tidstr)
642 {
643 /* Don't generate an error, just say which thread is current. */
644 if (target_has_stack)
645 printf_filtered ("[Current thread is %d (%s)]\n",
646 pid_to_thread_id (inferior_pid),
647 #if defined(HPUXHPPA)
648 target_tid_to_str (inferior_pid)
649 #else
650 target_pid_to_str (inferior_pid)
651 #endif
652 );
653 else
654 error ("No stack.");
655 return;
656 }
657
658 gdb_thread_select (tidstr);
659 }
660
661 static int
662 do_captured_thread_select (void *tidstr)
663 {
664 int num;
665 struct thread_info *tp;
666
667 num = atoi ((char *)tidstr);
668
669 tp = find_thread_id (num);
670
671 #ifdef UI_OUT
672 if (!tp)
673 error ("Thread ID %d not known.", num);
674 #else
675 if (!tp)
676 error ("Thread ID %d not known. Use the \"info threads\" command to\n\
677 see the IDs of currently known threads.", num);
678 #endif
679
680 if (!thread_alive (tp))
681 error ("Thread ID %d has terminated.\n", num);
682
683 switch_to_thread (tp->pid);
684
685 #ifdef UI_OUT
686 ui_out_text (uiout, "[Switching to thread ");
687 ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_pid));
688 ui_out_text (uiout, " (");
689 #if defined(HPUXHPPA)
690 ui_out_text (uiout, target_tid_to_str (inferior_pid));
691 #else
692 ui_out_text (uiout, target_pid_to_str (inferior_pid));
693 #endif
694 ui_out_text (uiout, ")]");
695 #else /* UI_OUT */
696 printf_filtered ("[Switching to thread %d (%s)]\n",
697 pid_to_thread_id (inferior_pid),
698 #if defined(HPUXHPPA)
699 target_tid_to_str (inferior_pid)
700 #else
701 target_pid_to_str (inferior_pid)
702 #endif
703 );
704 #endif /* UI_OUT */
705
706 print_stack_frame (selected_frame, selected_frame_level, 1);
707 return GDB_RC_OK;
708 }
709
710 enum gdb_rc
711 gdb_thread_select (char *tidstr)
712 {
713 return catch_errors (do_captured_thread_select, tidstr,
714 NULL, RETURN_MASK_ALL);
715 }
716
717 /* Commands with a prefix of `thread'. */
718 struct cmd_list_element *thread_cmd_list = NULL;
719
720 void
721 _initialize_thread (void)
722 {
723 static struct cmd_list_element *thread_apply_list = NULL;
724
725 add_info ("threads", info_threads_command,
726 "IDs of currently known threads.");
727
728 add_prefix_cmd ("thread", class_run, thread_command,
729 "Use this command to switch between threads.\n\
730 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
731 &cmdlist);
732
733 add_prefix_cmd ("apply", class_run, thread_apply_command,
734 "Apply a command to a list of threads.",
735 &thread_apply_list, "apply ", 1, &thread_cmd_list);
736
737 add_cmd ("all", class_run, thread_apply_all_command,
738 "Apply a command to all threads.",
739 &thread_apply_list);
740
741 if (!xdb_commands)
742 add_com_alias ("t", "thread", class_run, 1);
743 }
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