1 /* Program and address space management, for GDB, the GNU debugger.
3 Copyright (C) 2009-2018 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "arch-utils.h"
26 #include "gdbthread.h"
28 /* The last program space number assigned. */
29 int last_program_space_num = 0;
31 /* The head of the program spaces list. */
32 struct program_space *program_spaces;
34 /* Pointer to the current program space. */
35 struct program_space *current_program_space;
37 /* The last address space number assigned. */
38 static int highest_address_space_num;
42 /* Keep a registry of per-program_space data-pointers required by other GDB
45 DEFINE_REGISTRY (program_space, REGISTRY_ACCESS_FIELD)
47 /* Keep a registry of per-address_space data-pointers required by other GDB
50 DEFINE_REGISTRY (address_space, REGISTRY_ACCESS_FIELD)
54 /* Create a new address space object, and add it to the list. */
56 struct address_space *
57 new_address_space (void)
59 struct address_space *aspace;
61 aspace = XCNEW (struct address_space);
62 aspace->num = ++highest_address_space_num;
63 address_space_alloc_data (aspace);
68 /* Maybe create a new address space object, and add it to the list, or
69 return a pointer to an existing address space, in case inferiors
70 share an address space on this target system. */
72 struct address_space *
73 maybe_new_address_space (void)
75 int shared_aspace = gdbarch_has_shared_address_space (target_gdbarch ());
79 /* Just return the first in the list. */
80 return program_spaces->aspace;
83 return new_address_space ();
87 free_address_space (struct address_space *aspace)
89 address_space_free_data (aspace);
94 address_space_num (struct address_space *aspace)
99 /* Start counting over from scratch. */
102 init_address_spaces (void)
104 highest_address_space_num = 0;
109 /* Adds a new empty program space to the program space list, and binds
110 it to ASPACE. Returns the pointer to the new object. */
112 program_space::program_space (address_space *aspace_)
113 : num (++last_program_space_num), aspace (aspace_)
115 program_space_alloc_data (this);
117 if (program_spaces == NULL)
118 program_spaces = this;
121 struct program_space *last;
123 for (last = program_spaces; last->next != NULL; last = last->next)
129 /* Releases program space PSPACE, and all its contents (shared
130 libraries, objfiles, and any other references to the PSPACE in
131 other modules). It is an internal error to call this when PSPACE
132 is the current program space, since there should always be a
135 program_space::~program_space ()
137 gdb_assert (this != current_program_space);
139 scoped_restore_current_program_space restore_pspace;
141 set_current_program_space (this);
143 breakpoint_program_space_exit (this);
144 no_shared_libraries (NULL, 0);
146 free_all_objfiles ();
147 if (!gdbarch_has_shared_address_space (target_gdbarch ()))
148 free_address_space (this->aspace);
149 clear_section_table (&this->target_sections);
150 clear_program_space_solib_cache (this);
151 /* Discard any data modules have associated with the PSPACE. */
152 program_space_free_data (this);
155 /* Copies program space SRC to DEST. Copies the main executable file,
156 and the main symbol file. Returns DEST. */
158 struct program_space *
159 clone_program_space (struct program_space *dest, struct program_space *src)
161 scoped_restore_current_program_space restore_pspace;
163 set_current_program_space (dest);
165 if (src->pspace_exec_filename != NULL)
166 exec_file_attach (src->pspace_exec_filename, 0);
168 if (src->symfile_object_file != NULL)
169 symbol_file_add_main (objfile_name (src->symfile_object_file), 0);
174 /* Sets PSPACE as the current program space. It is the caller's
175 responsibility to make sure that the currently selected
176 inferior/thread matches the selected program space. */
179 set_current_program_space (struct program_space *pspace)
181 if (current_program_space == pspace)
184 gdb_assert (pspace != NULL);
186 current_program_space = pspace;
188 /* Different symbols change our view of the frame chain. */
189 reinit_frame_cache ();
192 /* Returns true iff there's no inferior bound to PSPACE. */
195 program_space_empty_p (struct program_space *pspace)
197 if (find_inferior_for_program_space (pspace) != NULL)
203 /* Remove a program space from the program spaces list and release it. It is
204 an error to call this function while PSPACE is the current program space. */
207 delete_program_space (struct program_space *pspace)
209 struct program_space *ss, **ss_link;
210 gdb_assert (pspace != NULL);
211 gdb_assert (pspace != current_program_space);
214 ss_link = &program_spaces;
230 /* Prints the list of program spaces and their details on UIOUT. If
231 REQUESTED is not -1, it's the ID of the pspace that should be
232 printed. Otherwise, all spaces are printed. */
235 print_program_space (struct ui_out *uiout, int requested)
237 struct program_space *pspace;
240 /* Compute number of pspaces we will print. */
243 if (requested != -1 && pspace->num != requested)
249 /* There should always be at least one. */
250 gdb_assert (count > 0);
252 ui_out_emit_table table_emitter (uiout, 3, count, "pspaces");
253 uiout->table_header (1, ui_left, "current", "");
254 uiout->table_header (4, ui_left, "id", "Id");
255 uiout->table_header (17, ui_left, "exec", "Executable");
256 uiout->table_body ();
260 struct inferior *inf;
263 if (requested != -1 && requested != pspace->num)
266 ui_out_emit_tuple tuple_emitter (uiout, NULL);
268 if (pspace == current_program_space)
269 uiout->field_string ("current", "*");
271 uiout->field_skip ("current");
273 uiout->field_int ("id", pspace->num);
275 if (pspace->pspace_exec_filename)
276 uiout->field_string ("exec", pspace->pspace_exec_filename);
278 uiout->field_skip ("exec");
280 /* Print extra info that doesn't really fit in tabular form.
281 Currently, we print the list of inferiors bound to a pspace.
282 There can be more than one inferior bound to the same pspace,
283 e.g., both parent/child inferiors in a vfork, or, on targets
284 that share pspaces between inferiors. */
286 for (inf = inferior_list; inf; inf = inf->next)
287 if (inf->pspace == pspace)
292 printf_filtered ("\n\tBound inferiors: ID %d (%s)",
294 target_pid_to_str (pid_to_ptid (inf->pid)));
297 printf_filtered (", ID %d (%s)",
299 target_pid_to_str (pid_to_ptid (inf->pid)));
306 /* Boolean test for an already-known program space id. */
309 valid_program_space_id (int num)
311 struct program_space *pspace;
314 if (pspace->num == num)
320 /* If ARGS is NULL or empty, print information about all program
321 spaces. Otherwise, ARGS is a text representation of a LONG
322 indicating which the program space to print information about. */
325 maintenance_info_program_spaces_command (const char *args, int from_tty)
331 requested = parse_and_eval_long (args);
332 if (!valid_program_space_id (requested))
333 error (_("program space ID %d not known."), requested);
336 print_program_space (current_uiout, requested);
339 /* Simply returns the count of program spaces. */
342 number_of_program_spaces (void)
344 struct program_space *pspace;
353 /* Update all program spaces matching to address spaces. The user may
354 have created several program spaces, and loaded executables into
355 them before connecting to the target interface that will create the
356 inferiors. All that happens before GDB has a chance to know if the
357 inferiors will share an address space or not. Call this after
358 having connected to the target interface and having fetched the
359 target description, to fixup the program/address spaces mappings.
361 It is assumed that there are no bound inferiors yet, otherwise,
362 they'd be left with stale referenced to released aspaces. */
365 update_address_spaces (void)
367 int shared_aspace = gdbarch_has_shared_address_space (target_gdbarch ());
368 struct program_space *pspace;
369 struct inferior *inf;
371 init_address_spaces ();
375 struct address_space *aspace = new_address_space ();
377 free_address_space (current_program_space->aspace);
379 pspace->aspace = aspace;
384 free_address_space (pspace->aspace);
385 pspace->aspace = new_address_space ();
388 for (inf = inferior_list; inf; inf = inf->next)
389 if (gdbarch_has_global_solist (target_gdbarch ()))
390 inf->aspace = maybe_new_address_space ();
392 inf->aspace = inf->pspace->aspace;
397 /* See progspace.h. */
400 clear_program_space_solib_cache (struct program_space *pspace)
402 VEC_free (so_list_ptr, pspace->added_solibs);
404 pspace->deleted_solibs.clear ();
410 initialize_progspace (void)
412 add_cmd ("program-spaces", class_maintenance,
413 maintenance_info_program_spaces_command,
414 _("Info about currently known program spaces."),
415 &maintenanceinfolist);
417 /* There's always one program space. Note that this function isn't
418 an automatic _initialize_foo function, since other
419 _initialize_foo routines may need to install their per-pspace
420 data keys. We can only allocate a progspace when all those
421 modules have done that. Do this before
422 initialize_current_architecture, because that accesses exec_bfd,
423 which in turn dereferences current_program_space. */
424 current_program_space = new program_space (new_address_space ());