gdb/gdbserver/inferiors.c

   1 /* Inferior process information for the remote server for GDB.
   2    Copyright (C) 2002-2017 Free Software Foundation, Inc.
   3
   4    Contributed by MontaVista Software.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "server.h"
  22 #include "gdbthread.h"
  23 #include "dll.h"
  24
  25 std::list<process_info *> all_processes;
  26 std::list<thread_info *> all_threads;
  27
  28 struct thread_info *current_thread;
  29
  30 /* The current working directory used to start the inferior.  */
  31 static const char *current_inferior_cwd = NULL;
  32
  33 thread_info *
  34 find_inferior (std::list<thread_info *> *thread_list,
  35                int (*func) (thread_info *, void *),
  36                void *arg)
  37 {
  38   gdb_assert (thread_list == &all_threads);
  39
  40   return find_thread ([&] (thread_info *thread) {
  41     return func (thread, arg);
  42   });
  43 }
  44
  45 thread_info *
  46 find_inferior_id (std::list<thread_info *> *thread_list, ptid_t id)
  47 {
  48   gdb_assert (thread_list == &all_threads);
  49
  50   return find_thread ([&] (thread_info *thread) {
  51     return thread->id == id;
  52   });
  53 }
  54
  55 thread_info *
  56 find_inferior_in_random (std::list<thread_info *> *thread_list,
  57                          int (*func) (thread_info *, void *),
  58                          void *arg)
  59 {
  60   gdb_assert (thread_list == &all_threads);
  61
  62   return find_thread_in_random ([&] (thread_info *thread) {
  63     return func (thread, arg);
  64   });
  65 }
  66
  67 void
  68 for_each_inferior (std::list<thread_info *> *thread_list,
  69                    void (*action) (thread_info *))
  70 {
  71   gdb_assert (thread_list == &all_threads);
  72
  73   for_each_thread ([&] (thread_info *thread) {
  74     action (thread);
  75   });
  76 }
  77
  78 void
  79 for_each_inferior_with_data (std::list<thread_info *> *thread_list,
  80                              void (*action) (thread_info *, void *),
  81                              void *data)
  82 {
  83   gdb_assert (thread_list == &all_threads);
  84
  85   for_each_thread ([&] (thread_info *thread) {
  86     action (thread, data);
  87   });
  88 }
  89
  90 struct thread_info *
  91 add_thread (ptid_t thread_id, void *target_data)
  92 {
  93   struct thread_info *new_thread = XCNEW (struct thread_info);
  94
  95   new_thread->id = thread_id;
  96   new_thread->last_resume_kind = resume_continue;
  97   new_thread->last_status.kind = TARGET_WAITKIND_IGNORE;
  98
  99   all_threads.push_back (new_thread);
 100
 101   if (current_thread == NULL)
 102     current_thread = new_thread;
 103
 104   new_thread->target_data = target_data;
 105
 106   return new_thread;
 107 }
 108
 109 /* See gdbthread.h.  */
 110
 111 struct thread_info *
 112 get_first_thread (void)
 113 {
 114   if (!all_threads.empty ())
 115     return all_threads.front ();
 116   else
 117     return NULL;
 118 }
 119
 120 struct thread_info *
 121 find_thread_ptid (ptid_t ptid)
 122 {
 123   return (struct thread_info *) find_inferior_id (&all_threads, ptid);
 124 }
 125
 126 /* Find a thread associated with the given PROCESS, or NULL if no
 127    such thread exists.  */
 128
 129 static struct thread_info *
 130 find_thread_process (const struct process_info *const process)
 131 {
 132   return find_any_thread_of_pid (process->pid);
 133 }
 134
 135 /* See gdbthread.h.  */
 136
 137 struct thread_info *
 138 find_any_thread_of_pid (int pid)
 139 {
 140   return find_thread (pid, [] (thread_info *thread) {
 141     return true;
 142   });
 143 }
 144
 145 static void
 146 free_one_thread (thread_info *thread)
 147 {
 148   free_register_cache (thread_regcache_data (thread));
 149   free (thread);
 150 }
 151
 152 void
 153 remove_thread (struct thread_info *thread)
 154 {
 155   if (thread->btrace != NULL)
 156     target_disable_btrace (thread->btrace);
 157
 158   discard_queued_stop_replies (ptid_of (thread));
 159   all_threads.remove (thread);
 160   free_one_thread (thread);
 161   if (current_thread == thread)
 162     current_thread = NULL;
 163 }
 164
 165 void *
 166 thread_target_data (struct thread_info *thread)
 167 {
 168   return thread->target_data;
 169 }
 170
 171 struct regcache *
 172 thread_regcache_data (struct thread_info *thread)
 173 {
 174   return thread->regcache_data;
 175 }
 176
 177 void
 178 set_thread_regcache_data (struct thread_info *thread, struct regcache *data)
 179 {
 180   thread->regcache_data = data;
 181 }
 182
 183 void
 184 clear_inferiors (void)
 185 {
 186   for_each_inferior (&all_threads, free_one_thread);
 187   all_threads.clear ();
 188
 189   clear_dlls ();
 190
 191   current_thread = NULL;
 192 }
 193
 194 struct process_info *
 195 add_process (int pid, int attached)
 196 {
 197   process_info *process = new process_info (pid, attached);
 198
 199   all_processes.push_back (process);
 200
 201   return process;
 202 }
 203
 204 /* Remove a process from the common process list and free the memory
 205    allocated for it.
 206    The caller is responsible for freeing private data first.  */
 207
 208 void
 209 remove_process (struct process_info *process)
 210 {
 211   clear_symbol_cache (&process->symbol_cache);
 212   free_all_breakpoints (process);
 213   gdb_assert (find_thread_process (process) == NULL);
 214   all_processes.remove (process);
 215   delete process;
 216 }
 217
 218 process_info *
 219 find_process_pid (int pid)
 220 {
 221   return find_process ([&] (process_info *process) {
 222     return process->pid == pid;
 223   });
 224 }
 225
 226 /* Get the first process in the process list, or NULL if the list is empty.  */
 227
 228 process_info *
 229 get_first_process (void)
 230 {
 231   if (!all_processes.empty ())
 232     return all_processes.front ();
 233   else
 234     return NULL;
 235 }
 236
 237 /* Return non-zero if there are any inferiors that we have created
 238    (as opposed to attached-to).  */
 239
 240 int
 241 have_started_inferiors_p (void)
 242 {
 243   return find_process ([] (process_info *process) {
 244     return !process->attached;
 245   }) != NULL;
 246 }
 247
 248 /* Return non-zero if there are any inferiors that we have attached to.  */
 249
 250 int
 251 have_attached_inferiors_p (void)
 252 {
 253   return find_process ([] (process_info *process) {
 254     return process->attached;
 255   }) != NULL;
 256 }
 257
 258 struct process_info *
 259 get_thread_process (const struct thread_info *thread)
 260 {
 261   return find_process_pid (thread->id.pid ());
 262 }
 263
 264 struct process_info *
 265 current_process (void)
 266 {
 267   gdb_assert (current_thread != NULL);
 268   return get_thread_process (current_thread);
 269 }
 270
 271 static void
 272 do_restore_current_thread_cleanup (void *arg)
 273 {
 274   current_thread = (struct thread_info *) arg;
 275 }
 276
 277 struct cleanup *
 278 make_cleanup_restore_current_thread (void)
 279 {
 280   return make_cleanup (do_restore_current_thread_cleanup, current_thread);
 281 }
 282
 283 /* See common/common-gdbthread.h.  */
 284
 285 void
 286 switch_to_thread (ptid_t ptid)
 287 {
 288   gdb_assert (ptid != minus_one_ptid);
 289   current_thread = find_thread_ptid (ptid);
 290 }
 291
 292 /* See common/common-inferior.h.  */
 293
 294 const char *
 295 get_inferior_cwd ()
 296 {
 297   return current_inferior_cwd;
 298 }
 299
 300 /* See common/common-inferior.h.  */
 301
 302 void
 303 set_inferior_cwd (const char *cwd)
 304 {
 305   xfree ((void *) current_inferior_cwd);
 306   if (cwd != NULL)
 307     current_inferior_cwd = xstrdup (cwd);
 308   else
 309     current_inferior_cwd = NULL;
 310 }