gdb/thread.c

   1 /* Multi-process/thread control for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1988, 1993
   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  22
  23 #include "defs.h"
  24 #include "symtab.h"
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "environ.h"
  28 #include "value.h"
  29 #include "target.h"
  30 #include "thread.h"
  31 #include "command.h"
  32 #include "gdbcmd.h"
  33
  34 #include <ctype.h>
  35 #include <sys/types.h>
  36 #include <signal.h>
  37
  38 /*#include "lynxos-core.h"*/
  39
  40 struct thread_info
  41 {
  42   struct thread_info *next;
  43   int pid;                      /* Actual process id */
  44   int num;                      /* Convenient handle */
  45   CORE_ADDR prev_pc;            /* State from wait_for_inferior */
  46   CORE_ADDR prev_func_start;
  47   char *prev_func_name;
  48   struct breakpoint *step_resume_breakpoint;
  49   struct breakpoint *through_sigtramp_breakpoint;
  50   CORE_ADDR step_range_start;
  51   CORE_ADDR step_range_end;
  52   CORE_ADDR step_frame_address;
  53   int trap_expected;
  54   int handling_longjmp;
  55   int another_trap;
  56 };
  57
  58 static struct thread_info *thread_list = NULL;
  59 static int highest_thread_num;
  60
  61 static void thread_command PARAMS ((char * tidstr, int from_tty));
  62
  63 static void prune_threads PARAMS ((void));
  64
  65 static void thread_switch PARAMS ((int pid));
  66
  67 static struct thread_info * find_thread_id PARAMS ((int num));
  68
  69 void
  70 init_thread_list ()
  71 {
  72   struct thread_info *tp, *tpnext;
  73
  74   if (!thread_list)
  75     return;
  76
  77   for (tp = thread_list; tp; tp = tpnext)
  78     {
  79       tpnext = tp->next;
  80       free (tp);
  81     }
  82
  83   thread_list = NULL;
  84   highest_thread_num = 0;
  85 }
  86
  87 void
  88 add_thread (pid)
  89      int pid;
  90 {
  91   struct thread_info *tp;
  92
  93   tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
  94
  95   tp->pid = pid;
  96   tp->num = ++highest_thread_num;
  97   tp->prev_pc = 0;
  98   tp->prev_func_start = 0;
  99   tp->prev_func_name = NULL;
 100   tp->step_range_start = 0;
 101   tp->step_range_end = 0;
 102   tp->step_frame_address =0;
 103   tp->step_resume_breakpoint = 0;
 104   tp->through_sigtramp_breakpoint = 0;
 105   tp->handling_longjmp = 0;
 106   tp->trap_expected = 0;
 107   tp->another_trap = 0;
 108   tp->next = thread_list;
 109   thread_list = tp;
 110 }
 111
 112 static struct thread_info *
 113 find_thread_id (num)
 114     int num;
 115 {
 116   struct thread_info *tp;
 117
 118   for (tp = thread_list; tp; tp = tp->next)
 119     if (tp->num == num)
 120       return tp;
 121
 122   return NULL;
 123 }
 124
 125 int
 126 valid_thread_id (num)
 127     int num;
 128 {
 129   struct thread_info *tp;
 130
 131   for (tp = thread_list; tp; tp = tp->next)
 132     if (tp->num == num)
 133       return 1;
 134
 135   return 0;
 136 }
 137
 138 int
 139 pid_to_thread_id (pid)
 140     int pid;
 141 {
 142   struct thread_info *tp;
 143
 144   for (tp = thread_list; tp; tp = tp->next)
 145     if (tp->pid == pid)
 146       return tp->num;
 147
 148   return 0;
 149 }
 150
 151 int
 152 in_thread_list (pid)
 153     int pid;
 154 {
 155   struct thread_info *tp;
 156
 157   for (tp = thread_list; tp; tp = tp->next)
 158     if (tp->pid == pid)
 159       return 1;
 160
 161   return 0;                     /* Never heard of 'im */
 162 }
 163
 164 /* Load infrun state for the thread PID.  */
 165
 166 void load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 167                         trap_expected, step_resume_breakpoint,
 168                         through_sigtramp_breakpoint, step_range_start,
 169                         step_range_end, step_frame_address,
 170                         handling_longjmp, another_trap)
 171      int pid;
 172      CORE_ADDR *prev_pc;
 173      CORE_ADDR *prev_func_start;
 174      char **prev_func_name;
 175      int *trap_expected;
 176      struct breakpoint **step_resume_breakpoint;
 177      struct breakpoint **through_sigtramp_breakpoint;
 178      CORE_ADDR *step_range_start;
 179      CORE_ADDR *step_range_end;
 180      CORE_ADDR *step_frame_address;
 181      int *handling_longjmp;
 182      int *another_trap;
 183 {
 184   struct thread_info *tp;
 185
 186   /* If we can't find the thread, then we're debugging a single threaded
 187      process.  No need to do anything in that case.  */
 188   tp = find_thread_id (pid_to_thread_id (pid));
 189   if (tp == NULL)
 190     return;
 191
 192   *prev_pc = tp->prev_pc;
 193   *prev_func_start = tp->prev_func_start;
 194   *prev_func_name = tp->prev_func_name;
 195   *step_resume_breakpoint = tp->step_resume_breakpoint;
 196   *step_range_start = tp->step_range_start;
 197   *step_range_end = tp->step_range_end;
 198   *step_frame_address = tp->step_frame_address;
 199   *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
 200   *handling_longjmp = tp->handling_longjmp;
 201   *trap_expected = tp->trap_expected;
 202   *another_trap = tp->another_trap;
 203 }
 204
 205 /* Save infrun state for the thread PID.  */
 206
 207 void save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 208                         trap_expected, step_resume_breakpoint,
 209                         through_sigtramp_breakpoint, step_range_start,
 210                         step_range_end, step_frame_address,
 211                         handling_longjmp, another_trap)
 212      int pid;
 213      CORE_ADDR prev_pc;
 214      CORE_ADDR prev_func_start;
 215      char *prev_func_name;
 216      int trap_expected;
 217      struct breakpoint *step_resume_breakpoint;
 218      struct breakpoint *through_sigtramp_breakpoint;
 219      CORE_ADDR step_range_start;
 220      CORE_ADDR step_range_end;
 221      CORE_ADDR step_frame_address;
 222      int handling_longjmp;
 223      int another_trap;
 224 {
 225   struct thread_info *tp;
 226
 227   /* If we can't find the thread, then we're debugging a single-threaded
 228      process.  Nothing to do in that case.  */
 229   tp = find_thread_id (pid_to_thread_id (pid));
 230   if (tp == NULL)
 231     return;
 232
 233   tp->prev_pc = prev_pc;
 234   tp->prev_func_start = prev_func_start;
 235   tp->prev_func_name = prev_func_name;
 236   tp->step_resume_breakpoint = step_resume_breakpoint;
 237   tp->step_range_start = step_range_start;
 238   tp->step_range_end = step_range_end;
 239   tp->step_frame_address = step_frame_address;
 240   tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
 241   tp->handling_longjmp = handling_longjmp;
 242   tp->trap_expected = trap_expected;
 243   tp->another_trap = another_trap;
 244 }
 245
 246 static void
 247 prune_threads ()
 248 {
 249   struct thread_info *tp, *tpprev;
 250
 251   tpprev = 0;
 252
 253   for (tp = thread_list; tp; tp = tp->next)
 254     if (tp->pid == -1)
 255       {
 256         if (tpprev)
 257           tpprev->next = tp->next;
 258         else
 259           thread_list = NULL;
 260
 261         free (tp);
 262       }
 263     else
 264       tpprev = tp;
 265 }
 266
 267 /* Print information about currently known threads */
 268
 269 static void
 270 info_threads_command (arg, from_tty)
 271      char *arg;
 272      int from_tty;
 273 {
 274   struct thread_info *tp;
 275   int current_pid = inferior_pid;
 276
 277   /* Avoid coredumps which would happen if we tried to access a NULL
 278      selected_frame.  */
 279   if (!target_has_stack) error ("No stack.");
 280
 281   for (tp = thread_list; tp; tp = tp->next)
 282     {
 283       /* FIXME: need to figure out a way to do this for remote too,
 284          or else the print_stack_frame below will fail with a bogus
 285          thread ID.  */
 286       if (!STREQ (current_target.to_shortname, "remote")
 287           && target_has_execution
 288           && kill (tp->pid, 0) == -1)
 289         {
 290           tp->pid = -1; /* Mark it as dead */
 291           continue;
 292         }
 293
 294       if (tp->pid == current_pid)
 295         printf_filtered ("* ");
 296       else
 297         printf_filtered ("  ");
 298
 299       printf_filtered ("%d %s  ", tp->num, target_pid_to_str (tp->pid));
 300
 301       thread_switch (tp->pid);
 302       print_stack_frame (selected_frame, -1, 0);
 303     }
 304
 305   thread_switch (current_pid);
 306   prune_threads ();
 307 }
 308
 309 /* Switch from one thread to another. */
 310
 311 static void
 312 thread_switch (pid)
 313      int pid;
 314 {
 315   if (pid == inferior_pid)
 316     return;
 317
 318   inferior_pid = pid;
 319   flush_cached_frames ();
 320   registers_changed ();
 321   stop_pc = read_pc();
 322   select_frame (get_current_frame (), 0);
 323 }
 324
 325 static void
 326 restore_current_thread (pid)
 327      int pid;
 328 {
 329   if (pid != inferior_pid)
 330     thread_switch (pid);
 331 }
 332
 333 /* Apply a GDB command to a list of threads.  List syntax is a whitespace
 334    seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
 335    of two numbers seperated by a hyphen.  Examples:
 336
 337         thread apply 1 2 7 4 backtrace  Apply backtrace cmd to threads 1,2,7,4
 338         thread apply 2-7 9 p foo(1)     Apply p foo(1) cmd to threads 2->7 & 9
 339         thread apply all p x/i $pc      Apply x/i $pc cmd to all threads
 340 */
 341
 342 static void
 343 thread_apply_all_command (cmd, from_tty)
 344      char *cmd;
 345      int from_tty;
 346 {
 347   struct thread_info *tp;
 348   struct cleanup *old_chain;
 349
 350   if (cmd == NULL || *cmd == '\000')
 351     error ("Please specify a command following the thread ID list");
 352
 353   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 354
 355   for (tp = thread_list; tp; tp = tp->next)
 356     {
 357       thread_switch (tp->pid);
 358       printf_filtered ("\nThread %d (%s):\n", tp->num,
 359                        target_pid_to_str (inferior_pid));
 360       execute_command (cmd, from_tty);
 361     }
 362 }
 363
 364 static void
 365 thread_apply_command (tidlist, from_tty)
 366      char *tidlist;
 367      int from_tty;
 368 {
 369   char *cmd;
 370   char *p;
 371   struct cleanup *old_chain;
 372
 373   if (tidlist == NULL || *tidlist == '\000')
 374     error ("Please specify a thread ID list");
 375
 376   for (cmd = tidlist; *cmd != '\000' && !isalpha(*cmd); cmd++);
 377
 378   if (*cmd == '\000')
 379     error ("Please specify a command following the thread ID list");
 380
 381   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 382
 383   while (tidlist < cmd)
 384     {
 385       struct thread_info *tp;
 386       int start, end;
 387
 388       start = strtol (tidlist, &p, 10);
 389       if (p == tidlist)
 390         error ("Error parsing %s", tidlist);
 391       tidlist = p;
 392
 393       while (*tidlist == ' ' || *tidlist == '\t')
 394         tidlist++;
 395
 396       if (*tidlist == '-')      /* Got a range of IDs? */
 397         {
 398           tidlist++;    /* Skip the - */
 399           end = strtol (tidlist, &p, 10);
 400           if (p == tidlist)
 401             error ("Error parsing %s", tidlist);
 402           tidlist = p;
 403
 404           while (*tidlist == ' ' || *tidlist == '\t')
 405             tidlist++;
 406         }
 407       else
 408         end = start;
 409
 410       for (; start <= end; start++)
 411         {
 412           tp = find_thread_id (start);
 413
 414           if (!tp)
 415             {
 416               warning ("Unknown thread %d.", start);
 417               continue;
 418             }
 419
 420           thread_switch (tp->pid);
 421           printf_filtered ("\nThread %d (%s):\n", tp->num,
 422                            target_pid_to_str (inferior_pid));
 423           execute_command (cmd, from_tty);
 424         }
 425     }
 426 }
 427
 428 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 429    if prefix of arg is `apply'.  */
 430
 431 static void
 432 thread_command (tidstr, from_tty)
 433      char *tidstr;
 434      int from_tty;
 435 {
 436   int num;
 437   struct thread_info *tp;
 438
 439   if (!tidstr)
 440     error ("Please specify a thread ID.  Use the \"info threads\" command to\n\
 441 see the IDs of currently known threads.");
 442
 443   num = atoi (tidstr);
 444
 445   tp = find_thread_id (num);
 446
 447   if (!tp)
 448     error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
 449 see the IDs of currently known threads.", num);
 450
 451   thread_switch (tp->pid);
 452
 453   printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
 454   print_stack_frame (selected_frame, selected_frame_level, 1);
 455 }
 456
 457 void
 458 _initialize_thread ()
 459 {
 460   static struct cmd_list_element *thread_cmd_list = NULL;
 461   static struct cmd_list_element *thread_apply_list = NULL;
 462   extern struct cmd_list_element *cmdlist;
 463
 464   add_info ("threads", info_threads_command,
 465             "IDs of currently known threads.");
 466
 467   add_prefix_cmd ("thread", class_run, thread_command,
 468                   "Use this command to switch between threads.\n\
 469 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
 470                   &cmdlist);
 471
 472   add_prefix_cmd ("apply", class_run, thread_apply_command,
 473                   "Apply a command to a list of threads.",
 474                   &thread_apply_list, "apply ", 1, &thread_cmd_list);
 475
 476   add_cmd ("all", class_run, thread_apply_all_command,
 477            "Apply a command to all threads.",
 478            &thread_apply_list);
 479
 480   add_com_alias ("t", "thread", class_run, 1);
 481 }