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 thread_switch 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 in_thread_list (pid)
 169     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 1;
 176
 177   return 0;                     /* Never heard of 'im */
 178 }
 179
 180 /* Load infrun state for the thread PID.  */
 181
 182 void load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 183                         trap_expected, step_resume_breakpoint,
 184                         through_sigtramp_breakpoint, step_range_start,
 185                         step_range_end, step_frame_address,
 186                         handling_longjmp, another_trap)
 187      int pid;
 188      CORE_ADDR *prev_pc;
 189      CORE_ADDR *prev_func_start;
 190      char **prev_func_name;
 191      int *trap_expected;
 192      struct breakpoint **step_resume_breakpoint;
 193      struct breakpoint **through_sigtramp_breakpoint;
 194      CORE_ADDR *step_range_start;
 195      CORE_ADDR *step_range_end;
 196      CORE_ADDR *step_frame_address;
 197      int *handling_longjmp;
 198      int *another_trap;
 199 {
 200   struct thread_info *tp;
 201
 202   /* If we can't find the thread, then we're debugging a single threaded
 203      process.  No need to do anything in that case.  */
 204   tp = find_thread_id (pid_to_thread_id (pid));
 205   if (tp == NULL)
 206     return;
 207
 208   *prev_pc = tp->prev_pc;
 209   *prev_func_start = tp->prev_func_start;
 210   *prev_func_name = tp->prev_func_name;
 211   *step_resume_breakpoint = tp->step_resume_breakpoint;
 212   *step_range_start = tp->step_range_start;
 213   *step_range_end = tp->step_range_end;
 214   *step_frame_address = tp->step_frame_address;
 215   *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
 216   *handling_longjmp = tp->handling_longjmp;
 217   *trap_expected = tp->trap_expected;
 218   *another_trap = tp->another_trap;
 219 }
 220
 221 /* Save infrun state for the thread PID.  */
 222
 223 void save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 224                         trap_expected, step_resume_breakpoint,
 225                         through_sigtramp_breakpoint, step_range_start,
 226                         step_range_end, step_frame_address,
 227                         handling_longjmp, another_trap)
 228      int pid;
 229      CORE_ADDR prev_pc;
 230      CORE_ADDR prev_func_start;
 231      char *prev_func_name;
 232      int trap_expected;
 233      struct breakpoint *step_resume_breakpoint;
 234      struct breakpoint *through_sigtramp_breakpoint;
 235      CORE_ADDR step_range_start;
 236      CORE_ADDR step_range_end;
 237      CORE_ADDR step_frame_address;
 238      int handling_longjmp;
 239      int another_trap;
 240 {
 241   struct thread_info *tp;
 242
 243   /* If we can't find the thread, then we're debugging a single-threaded
 244      process.  Nothing to do in that case.  */
 245   tp = find_thread_id (pid_to_thread_id (pid));
 246   if (tp == NULL)
 247     return;
 248
 249   tp->prev_pc = prev_pc;
 250   tp->prev_func_start = prev_func_start;
 251   tp->prev_func_name = prev_func_name;
 252   tp->step_resume_breakpoint = step_resume_breakpoint;
 253   tp->step_range_start = step_range_start;
 254   tp->step_range_end = step_range_end;
 255   tp->step_frame_address = step_frame_address;
 256   tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
 257   tp->handling_longjmp = handling_longjmp;
 258   tp->trap_expected = trap_expected;
 259   tp->another_trap = another_trap;
 260 }
 261
 262 static void
 263 prune_threads ()
 264 {
 265   struct thread_info *tp, *tpprev;
 266
 267   tpprev = 0;
 268
 269   for (tp = thread_list; tp; tp = tp->next)
 270     if (tp->pid == -1)
 271       {
 272         if (tpprev)
 273           tpprev->next = tp->next;
 274         else
 275           thread_list = NULL;
 276
 277         free (tp);
 278       }
 279     else
 280       tpprev = tp;
 281 }
 282
 283 /* Print information about currently known threads */
 284
 285 static void
 286 info_threads_command (arg, from_tty)
 287      char *arg;
 288      int from_tty;
 289 {
 290   struct thread_info *tp;
 291   int current_pid = inferior_pid;
 292
 293   /* Avoid coredumps which would happen if we tried to access a NULL
 294      selected_frame.  */
 295   if (!target_has_stack) error ("No stack.");
 296
 297   for (tp = thread_list; tp; tp = tp->next)
 298     {
 299       if (! target_thread_alive (tp->pid))
 300         {
 301           tp->pid = -1; /* Mark it as dead */
 302           continue;
 303         }
 304
 305       if (tp->pid == current_pid)
 306         printf_filtered ("* ");
 307       else
 308         printf_filtered ("  ");
 309
 310       printf_filtered ("%d %s  ", tp->num, target_pid_to_str (tp->pid));
 311
 312       thread_switch (tp->pid);
 313       print_stack_frame (selected_frame, -1, 0);
 314     }
 315
 316   thread_switch (current_pid);
 317   prune_threads ();
 318 }
 319
 320 /* Switch from one thread to another. */
 321
 322 static void
 323 thread_switch (pid)
 324      int pid;
 325 {
 326   if (pid == inferior_pid)
 327     return;
 328
 329   inferior_pid = pid;
 330   flush_cached_frames ();
 331   registers_changed ();
 332   stop_pc = read_pc();
 333   select_frame (get_current_frame (), 0);
 334 }
 335
 336 static void
 337 restore_current_thread (pid)
 338      int pid;
 339 {
 340   if (pid != inferior_pid)
 341     thread_switch (pid);
 342 }
 343
 344 /* Apply a GDB command to a list of threads.  List syntax is a whitespace
 345    seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
 346    of two numbers seperated by a hyphen.  Examples:
 347
 348         thread apply 1 2 7 4 backtrace  Apply backtrace cmd to threads 1,2,7,4
 349         thread apply 2-7 9 p foo(1)     Apply p foo(1) cmd to threads 2->7 & 9
 350         thread apply all p x/i $pc      Apply x/i $pc cmd to all threads
 351 */
 352
 353 static void
 354 thread_apply_all_command (cmd, from_tty)
 355      char *cmd;
 356      int from_tty;
 357 {
 358   struct thread_info *tp;
 359   struct cleanup *old_chain;
 360
 361   if (cmd == NULL || *cmd == '\000')
 362     error ("Please specify a command following the thread ID list");
 363
 364   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 365
 366   for (tp = thread_list; tp; tp = tp->next)
 367     {
 368       thread_switch (tp->pid);
 369       printf_filtered ("\nThread %d (%s):\n", tp->num,
 370                        target_pid_to_str (inferior_pid));
 371       execute_command (cmd, from_tty);
 372     }
 373 }
 374
 375 static void
 376 thread_apply_command (tidlist, from_tty)
 377      char *tidlist;
 378      int from_tty;
 379 {
 380   char *cmd;
 381   char *p;
 382   struct cleanup *old_chain;
 383
 384   if (tidlist == NULL || *tidlist == '\000')
 385     error ("Please specify a thread ID list");
 386
 387   for (cmd = tidlist; *cmd != '\000' && !isalpha(*cmd); cmd++);
 388
 389   if (*cmd == '\000')
 390     error ("Please specify a command following the thread ID list");
 391
 392   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 393
 394   while (tidlist < cmd)
 395     {
 396       struct thread_info *tp;
 397       int start, end;
 398
 399       start = 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       if (*tidlist == '-')      /* Got a range of IDs? */
 408         {
 409           tidlist++;    /* Skip the - */
 410           end = 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       else
 419         end = start;
 420
 421       for (; start <= end; start++)
 422         {
 423           tp = find_thread_id (start);
 424
 425           if (!tp)
 426             {
 427               warning ("Unknown thread %d.", start);
 428               continue;
 429             }
 430
 431           thread_switch (tp->pid);
 432           printf_filtered ("\nThread %d (%s):\n", tp->num,
 433                            target_pid_to_str (inferior_pid));
 434           execute_command (cmd, from_tty);
 435         }
 436     }
 437 }
 438
 439 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 440    if prefix of arg is `apply'.  */
 441
 442 static void
 443 thread_command (tidstr, from_tty)
 444      char *tidstr;
 445      int from_tty;
 446 {
 447   int num;
 448   struct thread_info *tp;
 449
 450   if (!tidstr)
 451     error ("Please specify a thread ID.  Use the \"info threads\" command to\n\
 452 see the IDs of currently known threads.");
 453
 454   num = atoi (tidstr);
 455
 456   tp = find_thread_id (num);
 457
 458   if (!tp)
 459     error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
 460 see the IDs of currently known threads.", num);
 461
 462   thread_switch (tp->pid);
 463
 464   printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
 465   print_stack_frame (selected_frame, selected_frame_level, 1);
 466 }
 467
 468 void
 469 _initialize_thread ()
 470 {
 471   static struct cmd_list_element *thread_cmd_list = NULL;
 472   static struct cmd_list_element *thread_apply_list = NULL;
 473   extern struct cmd_list_element *cmdlist;
 474
 475   add_info ("threads", info_threads_command,
 476             "IDs of currently known threads.");
 477
 478   add_prefix_cmd ("thread", class_run, thread_command,
 479                   "Use this command to switch between threads.\n\
 480 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
 481                   &cmdlist);
 482
 483   add_prefix_cmd ("apply", class_run, thread_apply_command,
 484                   "Apply a command to a list of threads.",
 485                   &thread_apply_list, "apply ", 1, &thread_cmd_list);
 486
 487   add_cmd ("all", class_run, thread_apply_all_command,
 488            "Apply a command to all threads.",
 489            &thread_apply_list);
 490
 491   add_com_alias ("t", "thread", class_run, 1);
 492 }