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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "gdbthread.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
  62 thread_command PARAMS ((char * tidstr, int from_tty));
  63
  64 static void
  65 prune_threads PARAMS ((void));
  66
  67 static void
  68 switch_to_thread PARAMS ((int pid));
  69
  70 static struct thread_info *
  71 find_thread_id PARAMS ((int num));
  72
  73 static void
  74 info_threads_command PARAMS ((char *, int));
  75
  76 static void
  77 restore_current_thread PARAMS ((int));
  78
  79 static void
  80 thread_apply_all_command PARAMS ((char *, int));
  81
  82 static void
  83 thread_apply_command PARAMS ((char *, int));
  84
  85 void
  86 init_thread_list ()
  87 {
  88   struct thread_info *tp, *tpnext;
  89
  90   if (!thread_list)
  91     return;
  92
  93   for (tp = thread_list; tp; tp = tpnext)
  94     {
  95       tpnext = tp->next;
  96       free (tp);
  97     }
  98
  99   thread_list = NULL;
 100   highest_thread_num = 0;
 101 }
 102
 103 void
 104 add_thread (pid)
 105      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->next = thread_list;
 125   thread_list = tp;
 126 }
 127
 128 static struct thread_info *
 129 find_thread_id (num)
 130     int num;
 131 {
 132   struct thread_info *tp;
 133
 134   for (tp = thread_list; tp; tp = tp->next)
 135     if (tp->num == num)
 136       return tp;
 137
 138   return NULL;
 139 }
 140
 141 int
 142 valid_thread_id (num)
 143     int num;
 144 {
 145   struct thread_info *tp;
 146
 147   for (tp = thread_list; tp; tp = tp->next)
 148     if (tp->num == num)
 149       return 1;
 150
 151   return 0;
 152 }
 153
 154 int
 155 pid_to_thread_id (pid)
 156     int pid;
 157 {
 158   struct thread_info *tp;
 159
 160   for (tp = thread_list; tp; tp = tp->next)
 161     if (tp->pid == pid)
 162       return tp->num;
 163
 164   return 0;
 165 }
 166
 167 int
 168 thread_id_to_pid (num)
 169     int num;
 170 {
 171   struct thread_info *thread = find_thread_id (num);
 172   if (thread)
 173     return thread->pid;
 174   else
 175     return -1;
 176 }
 177
 178 int
 179 in_thread_list (pid)
 180     int pid;
 181 {
 182   struct thread_info *tp;
 183
 184   for (tp = thread_list; tp; tp = tp->next)
 185     if (tp->pid == pid)
 186       return 1;
 187
 188   return 0;                     /* Never heard of 'im */
 189 }
 190
 191 /* Load infrun state for the thread PID.  */
 192
 193 void load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 194                         trap_expected, step_resume_breakpoint,
 195                         through_sigtramp_breakpoint, step_range_start,
 196                         step_range_end, step_frame_address,
 197                         handling_longjmp, another_trap)
 198      int pid;
 199      CORE_ADDR *prev_pc;
 200      CORE_ADDR *prev_func_start;
 201      char **prev_func_name;
 202      int *trap_expected;
 203      struct breakpoint **step_resume_breakpoint;
 204      struct breakpoint **through_sigtramp_breakpoint;
 205      CORE_ADDR *step_range_start;
 206      CORE_ADDR *step_range_end;
 207      CORE_ADDR *step_frame_address;
 208      int *handling_longjmp;
 209      int *another_trap;
 210 {
 211   struct thread_info *tp;
 212
 213   /* If we can't find the thread, then we're debugging a single threaded
 214      process.  No need to do anything in that case.  */
 215   tp = find_thread_id (pid_to_thread_id (pid));
 216   if (tp == NULL)
 217     return;
 218
 219   *prev_pc = tp->prev_pc;
 220   *prev_func_start = tp->prev_func_start;
 221   *prev_func_name = tp->prev_func_name;
 222   *step_resume_breakpoint = tp->step_resume_breakpoint;
 223   *step_range_start = tp->step_range_start;
 224   *step_range_end = tp->step_range_end;
 225   *step_frame_address = tp->step_frame_address;
 226   *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
 227   *handling_longjmp = tp->handling_longjmp;
 228   *trap_expected = tp->trap_expected;
 229   *another_trap = tp->another_trap;
 230 }
 231
 232 /* Save infrun state for the thread PID.  */
 233
 234 void save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 235                         trap_expected, step_resume_breakpoint,
 236                         through_sigtramp_breakpoint, step_range_start,
 237                         step_range_end, step_frame_address,
 238                         handling_longjmp, another_trap)
 239      int pid;
 240      CORE_ADDR prev_pc;
 241      CORE_ADDR prev_func_start;
 242      char *prev_func_name;
 243      int trap_expected;
 244      struct breakpoint *step_resume_breakpoint;
 245      struct breakpoint *through_sigtramp_breakpoint;
 246      CORE_ADDR step_range_start;
 247      CORE_ADDR step_range_end;
 248      CORE_ADDR step_frame_address;
 249      int handling_longjmp;
 250      int another_trap;
 251 {
 252   struct thread_info *tp;
 253
 254   /* If we can't find the thread, then we're debugging a single-threaded
 255      process.  Nothing to do in that case.  */
 256   tp = find_thread_id (pid_to_thread_id (pid));
 257   if (tp == NULL)
 258     return;
 259
 260   tp->prev_pc = prev_pc;
 261   tp->prev_func_start = prev_func_start;
 262   tp->prev_func_name = prev_func_name;
 263   tp->step_resume_breakpoint = step_resume_breakpoint;
 264   tp->step_range_start = step_range_start;
 265   tp->step_range_end = step_range_end;
 266   tp->step_frame_address = step_frame_address;
 267   tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
 268   tp->handling_longjmp = handling_longjmp;
 269   tp->trap_expected = trap_expected;
 270   tp->another_trap = another_trap;
 271 }
 272
 273 static void
 274 prune_threads ()
 275 {
 276   struct thread_info *tp, *tpprev;
 277
 278   tpprev = 0;
 279
 280   for (tp = thread_list; tp; tp = tp->next)
 281     if (tp->pid == -1)
 282       {
 283         if (tpprev)
 284           tpprev->next = tp->next;
 285         else
 286           thread_list = NULL;
 287
 288         free (tp);
 289       }
 290     else
 291       tpprev = tp;
 292 }
 293
 294 /* Print information about currently known threads */
 295
 296 static void
 297 info_threads_command (arg, from_tty)
 298      char *arg;
 299      int from_tty;
 300 {
 301   struct thread_info *tp;
 302   int current_pid = inferior_pid;
 303
 304   /* Avoid coredumps which would happen if we tried to access a NULL
 305      selected_frame.  */
 306   if (!target_has_stack) error ("No stack.");
 307
 308   for (tp = thread_list; tp; tp = tp->next)
 309     {
 310       if (! target_thread_alive (tp->pid))
 311         {
 312           tp->pid = -1; /* Mark it as dead */
 313           continue;
 314         }
 315
 316       if (tp->pid == current_pid)
 317         printf_filtered ("* ");
 318       else
 319         printf_filtered ("  ");
 320
 321       printf_filtered ("%d %s  ", tp->num, target_pid_to_str (tp->pid));
 322
 323       switch_to_thread (tp->pid);
 324       print_stack_frame (selected_frame, -1, 0);
 325     }
 326
 327   switch_to_thread (current_pid);
 328   prune_threads ();
 329 }
 330
 331 /* Switch from one thread to another. */
 332
 333 static void
 334 switch_to_thread (pid)
 335      int pid;
 336 {
 337   if (pid == inferior_pid)
 338     return;
 339
 340   inferior_pid = pid;
 341   flush_cached_frames ();
 342   registers_changed ();
 343   stop_pc = read_pc();
 344   select_frame (get_current_frame (), 0);
 345 }
 346
 347 static void
 348 restore_current_thread (pid)
 349      int pid;
 350 {
 351   if (pid != inferior_pid)
 352     switch_to_thread (pid);
 353 }
 354
 355 /* Apply a GDB command to a list of threads.  List syntax is a whitespace
 356    seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
 357    of two numbers seperated by a hyphen.  Examples:
 358
 359         thread apply 1 2 7 4 backtrace  Apply backtrace cmd to threads 1,2,7,4
 360         thread apply 2-7 9 p foo(1)     Apply p foo(1) cmd to threads 2->7 & 9
 361         thread apply all p x/i $pc      Apply x/i $pc cmd to all threads
 362 */
 363
 364 static void
 365 thread_apply_all_command (cmd, from_tty)
 366      char *cmd;
 367      int from_tty;
 368 {
 369   struct thread_info *tp;
 370   struct cleanup *old_chain;
 371
 372   if (cmd == NULL || *cmd == '\000')
 373     error ("Please specify a command following the thread ID list");
 374
 375   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 376
 377   for (tp = thread_list; tp; tp = tp->next)
 378     {
 379       switch_to_thread (tp->pid);
 380       printf_filtered ("\nThread %d (%s):\n", tp->num,
 381                        target_pid_to_str (inferior_pid));
 382       execute_command (cmd, from_tty);
 383     }
 384 }
 385
 386 static void
 387 thread_apply_command (tidlist, from_tty)
 388      char *tidlist;
 389      int from_tty;
 390 {
 391   char *cmd;
 392   char *p;
 393   struct cleanup *old_chain;
 394
 395   if (tidlist == NULL || *tidlist == '\000')
 396     error ("Please specify a thread ID list");
 397
 398   for (cmd = tidlist; *cmd != '\000' && !isalpha(*cmd); cmd++);
 399
 400   if (*cmd == '\000')
 401     error ("Please specify a command following the thread ID list");
 402
 403   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 404
 405   while (tidlist < cmd)
 406     {
 407       struct thread_info *tp;
 408       int start, end;
 409
 410       start = strtol (tidlist, &p, 10);
 411       if (p == tidlist)
 412         error ("Error parsing %s", tidlist);
 413       tidlist = p;
 414
 415       while (*tidlist == ' ' || *tidlist == '\t')
 416         tidlist++;
 417
 418       if (*tidlist == '-')      /* Got a range of IDs? */
 419         {
 420           tidlist++;    /* Skip the - */
 421           end = strtol (tidlist, &p, 10);
 422           if (p == tidlist)
 423             error ("Error parsing %s", tidlist);
 424           tidlist = p;
 425
 426           while (*tidlist == ' ' || *tidlist == '\t')
 427             tidlist++;
 428         }
 429       else
 430         end = start;
 431
 432       for (; start <= end; start++)
 433         {
 434           tp = find_thread_id (start);
 435
 436           if (!tp)
 437             {
 438               warning ("Unknown thread %d.", start);
 439               continue;
 440             }
 441
 442           switch_to_thread (tp->pid);
 443           printf_filtered ("\nThread %d (%s):\n", tp->num,
 444                            target_pid_to_str (inferior_pid));
 445           execute_command (cmd, from_tty);
 446         }
 447     }
 448 }
 449
 450 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 451    if prefix of arg is `apply'.  */
 452
 453 static void
 454 thread_command (tidstr, from_tty)
 455      char *tidstr;
 456      int from_tty;
 457 {
 458   int num;
 459   struct thread_info *tp;
 460
 461   if (!tidstr)
 462     error ("Please specify a thread ID.  Use the \"info threads\" command to\n\
 463 see the IDs of currently known threads.");
 464
 465   num = atoi (tidstr);
 466
 467   tp = find_thread_id (num);
 468
 469   if (!tp)
 470     error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
 471 see the IDs of currently known threads.", num);
 472
 473   switch_to_thread (tp->pid);
 474
 475   printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
 476   print_stack_frame (selected_frame, selected_frame_level, 1);
 477 }
 478
 479 /* Commands with a prefix of `thread'.  */
 480 struct cmd_list_element *thread_cmd_list = NULL;
 481
 482 void
 483 _initialize_thread ()
 484 {
 485   static struct cmd_list_element *thread_apply_list = NULL;
 486   extern struct cmd_list_element *cmdlist;
 487
 488   add_info ("threads", info_threads_command,
 489             "IDs of currently known threads.");
 490
 491   add_prefix_cmd ("thread", class_run, thread_command,
 492                   "Use this command to switch between threads.\n\
 493 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
 494                   &cmdlist);
 495
 496   add_prefix_cmd ("apply", class_run, thread_apply_command,
 497                   "Apply a command to a list of threads.",
 498                   &thread_apply_list, "apply ", 1, &thread_cmd_list);
 499
 500   add_cmd ("all", class_run, thread_apply_all_command,
 501            "Apply a command to all threads.",
 502            &thread_apply_list);
 503
 504   add_com_alias ("t", "thread", class_run, 1);
 505 }