1 /* Program and address space management, for GDB, the GNU debugger.
3 Copyright (C) 2009-2020 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"
27 #include "gdbthread.h"
31 /* The last program space number assigned. */
32 int last_program_space_num
= 0;
34 /* The head of the program spaces list. */
35 std::vector
<struct program_space
*> program_spaces
;
37 /* Pointer to the current program space. */
38 struct program_space
*current_program_space
;
40 /* The last address space number assigned. */
41 static int highest_address_space_num
;
45 /* Keep a registry of per-program_space data-pointers required by other GDB
48 DEFINE_REGISTRY (program_space
, REGISTRY_ACCESS_FIELD
)
50 /* Keep a registry of per-address_space data-pointers required by other GDB
53 DEFINE_REGISTRY (address_space
, REGISTRY_ACCESS_FIELD
)
57 /* Create a new address space object, and add it to the list. */
59 struct address_space
*
60 new_address_space (void)
62 struct address_space
*aspace
;
64 aspace
= XCNEW (struct address_space
);
65 aspace
->num
= ++highest_address_space_num
;
66 address_space_alloc_data (aspace
);
71 /* Maybe create a new address space object, and add it to the list, or
72 return a pointer to an existing address space, in case inferiors
73 share an address space on this target system. */
75 struct address_space
*
76 maybe_new_address_space (void)
78 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
82 /* Just return the first in the list. */
83 return program_spaces
[0]->aspace
;
86 return new_address_space ();
90 free_address_space (struct address_space
*aspace
)
92 address_space_free_data (aspace
);
97 address_space_num (struct address_space
*aspace
)
102 /* Start counting over from scratch. */
105 init_address_spaces (void)
107 highest_address_space_num
= 0;
112 /* Remove a program space from the program spaces list. */
115 remove_program_space (program_space
*pspace
)
117 gdb_assert (pspace
!= NULL
);
119 auto iter
= std::find (program_spaces
.begin (), program_spaces
.end (),
121 gdb_assert (iter
!= program_spaces
.end ());
122 program_spaces
.erase (iter
);
125 /* See progspace.h. */
127 program_space::program_space (address_space
*aspace_
)
128 : num (++last_program_space_num
),
131 program_space_alloc_data (this);
133 program_spaces
.push_back (this);
136 /* See progspace.h. */
138 program_space::~program_space ()
140 gdb_assert (this != current_program_space
);
142 remove_program_space (this);
144 scoped_restore_current_program_space restore_pspace
;
146 set_current_program_space (this);
148 breakpoint_program_space_exit (this);
149 no_shared_libraries (NULL
, 0);
151 free_all_objfiles ();
152 /* Defer breakpoint re-set because we don't want to create new
153 locations for this pspace which we're tearing down. */
154 clear_symtab_users (SYMFILE_DEFER_BP_RESET
);
155 if (!gdbarch_has_shared_address_space (target_gdbarch ()))
156 free_address_space (this->aspace
);
157 clear_program_space_solib_cache (this);
158 /* Discard any data modules have associated with the PSPACE. */
159 program_space_free_data (this);
162 /* See progspace.h. */
165 program_space::free_all_objfiles ()
167 /* Any objfile reference would become stale. */
168 for (struct so_list
*so
: current_program_space
->solibs ())
169 gdb_assert (so
->objfile
== NULL
);
171 while (!objfiles_list
.empty ())
172 objfiles_list
.front ()->unlink ();
175 /* See progspace.h. */
178 program_space::add_objfile (std::shared_ptr
<objfile
> &&objfile
,
179 struct objfile
*before
)
181 if (before
== nullptr)
182 objfiles_list
.push_back (std::move (objfile
));
185 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
186 [=] (const std::shared_ptr
<::objfile
> &objf
)
188 return objf
.get () == before
;
190 gdb_assert (iter
!= objfiles_list
.end ());
191 objfiles_list
.insert (iter
, std::move (objfile
));
195 /* See progspace.h. */
198 program_space::remove_objfile (struct objfile
*objfile
)
200 /* Removing an objfile from the objfile list invalidates any frame
201 that was built using frame info found in the objfile. Reinit the
202 frame cache to get rid of any frame that might otherwise
203 reference stale info. */
204 reinit_frame_cache ();
206 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
207 [=] (const std::shared_ptr
<::objfile
> &objf
)
209 return objf
.get () == objfile
;
211 gdb_assert (iter
!= objfiles_list
.end ());
212 objfiles_list
.erase (iter
);
214 if (objfile
== symfile_object_file
)
215 symfile_object_file
= NULL
;
218 /* See progspace.h. */
220 next_adapter
<struct so_list
>
221 program_space::solibs () const
223 return next_adapter
<struct so_list
> (this->so_list
);
226 /* Copies program space SRC to DEST. Copies the main executable file,
227 and the main symbol file. Returns DEST. */
229 struct program_space
*
230 clone_program_space (struct program_space
*dest
, struct program_space
*src
)
232 scoped_restore_current_program_space restore_pspace
;
234 set_current_program_space (dest
);
236 if (src
->exec_filename
!= NULL
)
237 exec_file_attach (src
->exec_filename
.get (), 0);
239 if (src
->symfile_object_file
!= NULL
)
240 symbol_file_add_main (objfile_name (src
->symfile_object_file
),
241 SYMFILE_DEFER_BP_RESET
);
246 /* Sets PSPACE as the current program space. It is the caller's
247 responsibility to make sure that the currently selected
248 inferior/thread matches the selected program space. */
251 set_current_program_space (struct program_space
*pspace
)
253 if (current_program_space
== pspace
)
256 gdb_assert (pspace
!= NULL
);
258 current_program_space
= pspace
;
260 /* Different symbols change our view of the frame chain. */
261 reinit_frame_cache ();
264 /* Returns true iff there's no inferior bound to PSPACE. */
267 program_space_empty_p (struct program_space
*pspace
)
269 if (find_inferior_for_program_space (pspace
) != NULL
)
275 /* Prints the list of program spaces and their details on UIOUT. If
276 REQUESTED is not -1, it's the ID of the pspace that should be
277 printed. Otherwise, all spaces are printed. */
280 print_program_space (struct ui_out
*uiout
, int requested
)
284 /* Compute number of pspaces we will print. */
285 for (struct program_space
*pspace
: program_spaces
)
287 if (requested
!= -1 && pspace
->num
!= requested
)
293 /* There should always be at least one. */
294 gdb_assert (count
> 0);
296 ui_out_emit_table
table_emitter (uiout
, 3, count
, "pspaces");
297 uiout
->table_header (1, ui_left
, "current", "");
298 uiout
->table_header (4, ui_left
, "id", "Id");
299 uiout
->table_header (17, ui_left
, "exec", "Executable");
300 uiout
->table_body ();
302 for (struct program_space
*pspace
: program_spaces
)
306 if (requested
!= -1 && requested
!= pspace
->num
)
309 ui_out_emit_tuple
tuple_emitter (uiout
, NULL
);
311 if (pspace
== current_program_space
)
312 uiout
->field_string ("current", "*");
314 uiout
->field_skip ("current");
316 uiout
->field_signed ("id", pspace
->num
);
318 if (pspace
->exec_filename
!= nullptr)
319 uiout
->field_string ("exec", pspace
->exec_filename
.get ());
321 uiout
->field_skip ("exec");
323 /* Print extra info that doesn't really fit in tabular form.
324 Currently, we print the list of inferiors bound to a pspace.
325 There can be more than one inferior bound to the same pspace,
326 e.g., both parent/child inferiors in a vfork, or, on targets
327 that share pspaces between inferiors. */
330 /* We're going to switch inferiors. */
331 scoped_restore_current_thread restore_thread
;
333 for (inferior
*inf
: all_inferiors ())
334 if (inf
->pspace
== pspace
)
336 /* Switch to inferior in order to call target methods. */
337 switch_to_inferior_no_thread (inf
);
342 printf_filtered ("\n\tBound inferiors: ID %d (%s)",
344 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
347 printf_filtered (", ID %d (%s)",
349 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
356 /* Boolean test for an already-known program space id. */
359 valid_program_space_id (int num
)
361 for (struct program_space
*pspace
: program_spaces
)
362 if (pspace
->num
== num
)
368 /* If ARGS is NULL or empty, print information about all program
369 spaces. Otherwise, ARGS is a text representation of a LONG
370 indicating which the program space to print information about. */
373 maintenance_info_program_spaces_command (const char *args
, int from_tty
)
379 requested
= parse_and_eval_long (args
);
380 if (!valid_program_space_id (requested
))
381 error (_("program space ID %d not known."), requested
);
384 print_program_space (current_uiout
, requested
);
387 /* Update all program spaces matching to address spaces. The user may
388 have created several program spaces, and loaded executables into
389 them before connecting to the target interface that will create the
390 inferiors. All that happens before GDB has a chance to know if the
391 inferiors will share an address space or not. Call this after
392 having connected to the target interface and having fetched the
393 target description, to fixup the program/address spaces mappings.
395 It is assumed that there are no bound inferiors yet, otherwise,
396 they'd be left with stale referenced to released aspaces. */
399 update_address_spaces (void)
401 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
402 struct inferior
*inf
;
404 init_address_spaces ();
408 struct address_space
*aspace
= new_address_space ();
410 free_address_space (current_program_space
->aspace
);
411 for (struct program_space
*pspace
: program_spaces
)
412 pspace
->aspace
= aspace
;
415 for (struct program_space
*pspace
: program_spaces
)
417 free_address_space (pspace
->aspace
);
418 pspace
->aspace
= new_address_space ();
421 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
422 if (gdbarch_has_global_solist (target_gdbarch ()))
423 inf
->aspace
= maybe_new_address_space ();
425 inf
->aspace
= inf
->pspace
->aspace
;
430 /* See progspace.h. */
433 clear_program_space_solib_cache (struct program_space
*pspace
)
435 pspace
->added_solibs
.clear ();
436 pspace
->deleted_solibs
.clear ();
442 initialize_progspace (void)
444 add_cmd ("program-spaces", class_maintenance
,
445 maintenance_info_program_spaces_command
,
446 _("Info about currently known program spaces."),
447 &maintenanceinfolist
);
449 /* There's always one program space. Note that this function isn't
450 an automatic _initialize_foo function, since other
451 _initialize_foo routines may need to install their per-pspace
452 data keys. We can only allocate a progspace when all those
453 modules have done that. Do this before
454 initialize_current_architecture, because that accesses exec_bfd,
455 which in turn dereferences current_program_space. */
456 current_program_space
= new program_space (new_address_space ());