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 /* See progspace.h. */
229 program_space::exec_close ()
233 gdb_bfd_unref (ebfd
);
235 /* Removing target sections may close the exec_ops target.
236 Clear exec_bfd before doing so to prevent recursion. */
240 remove_target_sections (&ebfd
);
242 exec_filename
.reset (nullptr);
246 /* Copies program space SRC to DEST. Copies the main executable file,
247 and the main symbol file. Returns DEST. */
249 struct program_space
*
250 clone_program_space (struct program_space
*dest
, struct program_space
*src
)
252 scoped_restore_current_program_space restore_pspace
;
254 set_current_program_space (dest
);
256 if (src
->exec_filename
!= NULL
)
257 exec_file_attach (src
->exec_filename
.get (), 0);
259 if (src
->symfile_object_file
!= NULL
)
260 symbol_file_add_main (objfile_name (src
->symfile_object_file
),
261 SYMFILE_DEFER_BP_RESET
);
266 /* Sets PSPACE as the current program space. It is the caller's
267 responsibility to make sure that the currently selected
268 inferior/thread matches the selected program space. */
271 set_current_program_space (struct program_space
*pspace
)
273 if (current_program_space
== pspace
)
276 gdb_assert (pspace
!= NULL
);
278 current_program_space
= pspace
;
280 /* Different symbols change our view of the frame chain. */
281 reinit_frame_cache ();
284 /* Returns true iff there's no inferior bound to PSPACE. */
287 program_space_empty_p (struct program_space
*pspace
)
289 if (find_inferior_for_program_space (pspace
) != NULL
)
295 /* Prints the list of program spaces and their details on UIOUT. If
296 REQUESTED is not -1, it's the ID of the pspace that should be
297 printed. Otherwise, all spaces are printed. */
300 print_program_space (struct ui_out
*uiout
, int requested
)
304 /* Compute number of pspaces we will print. */
305 for (struct program_space
*pspace
: program_spaces
)
307 if (requested
!= -1 && pspace
->num
!= requested
)
313 /* There should always be at least one. */
314 gdb_assert (count
> 0);
316 ui_out_emit_table
table_emitter (uiout
, 3, count
, "pspaces");
317 uiout
->table_header (1, ui_left
, "current", "");
318 uiout
->table_header (4, ui_left
, "id", "Id");
319 uiout
->table_header (17, ui_left
, "exec", "Executable");
320 uiout
->table_body ();
322 for (struct program_space
*pspace
: program_spaces
)
326 if (requested
!= -1 && requested
!= pspace
->num
)
329 ui_out_emit_tuple
tuple_emitter (uiout
, NULL
);
331 if (pspace
== current_program_space
)
332 uiout
->field_string ("current", "*");
334 uiout
->field_skip ("current");
336 uiout
->field_signed ("id", pspace
->num
);
338 if (pspace
->exec_filename
!= nullptr)
339 uiout
->field_string ("exec", pspace
->exec_filename
.get ());
341 uiout
->field_skip ("exec");
343 /* Print extra info that doesn't really fit in tabular form.
344 Currently, we print the list of inferiors bound to a pspace.
345 There can be more than one inferior bound to the same pspace,
346 e.g., both parent/child inferiors in a vfork, or, on targets
347 that share pspaces between inferiors. */
350 /* We're going to switch inferiors. */
351 scoped_restore_current_thread restore_thread
;
353 for (inferior
*inf
: all_inferiors ())
354 if (inf
->pspace
== pspace
)
356 /* Switch to inferior in order to call target methods. */
357 switch_to_inferior_no_thread (inf
);
362 printf_filtered ("\n\tBound inferiors: ID %d (%s)",
364 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
367 printf_filtered (", ID %d (%s)",
369 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
376 /* Boolean test for an already-known program space id. */
379 valid_program_space_id (int num
)
381 for (struct program_space
*pspace
: program_spaces
)
382 if (pspace
->num
== num
)
388 /* If ARGS is NULL or empty, print information about all program
389 spaces. Otherwise, ARGS is a text representation of a LONG
390 indicating which the program space to print information about. */
393 maintenance_info_program_spaces_command (const char *args
, int from_tty
)
399 requested
= parse_and_eval_long (args
);
400 if (!valid_program_space_id (requested
))
401 error (_("program space ID %d not known."), requested
);
404 print_program_space (current_uiout
, requested
);
407 /* Update all program spaces matching to address spaces. The user may
408 have created several program spaces, and loaded executables into
409 them before connecting to the target interface that will create the
410 inferiors. All that happens before GDB has a chance to know if the
411 inferiors will share an address space or not. Call this after
412 having connected to the target interface and having fetched the
413 target description, to fixup the program/address spaces mappings.
415 It is assumed that there are no bound inferiors yet, otherwise,
416 they'd be left with stale referenced to released aspaces. */
419 update_address_spaces (void)
421 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
422 struct inferior
*inf
;
424 init_address_spaces ();
428 struct address_space
*aspace
= new_address_space ();
430 free_address_space (current_program_space
->aspace
);
431 for (struct program_space
*pspace
: program_spaces
)
432 pspace
->aspace
= aspace
;
435 for (struct program_space
*pspace
: program_spaces
)
437 free_address_space (pspace
->aspace
);
438 pspace
->aspace
= new_address_space ();
441 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
442 if (gdbarch_has_global_solist (target_gdbarch ()))
443 inf
->aspace
= maybe_new_address_space ();
445 inf
->aspace
= inf
->pspace
->aspace
;
450 /* See progspace.h. */
453 clear_program_space_solib_cache (struct program_space
*pspace
)
455 pspace
->added_solibs
.clear ();
456 pspace
->deleted_solibs
.clear ();
462 initialize_progspace (void)
464 add_cmd ("program-spaces", class_maintenance
,
465 maintenance_info_program_spaces_command
,
466 _("Info about currently known program spaces."),
467 &maintenanceinfolist
);
469 /* There's always one program space. Note that this function isn't
470 an automatic _initialize_foo function, since other
471 _initialize_foo routines may need to install their per-pspace
472 data keys. We can only allocate a progspace when all those
473 modules have done that. Do this before
474 initialize_current_architecture, because that accesses exec_bfd,
475 which in turn dereferences current_program_space. */
476 current_program_space
= new program_space (new_address_space ());