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 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
->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 /* Add a program space from the program spaces list. */
115 add_program_space (program_space
*pspace
)
117 if (program_spaces
== NULL
)
118 program_spaces
= pspace
;
123 for (last
= program_spaces
; last
->next
!= NULL
; last
= last
->next
)
129 /* Remove a program space from the program spaces list. */
132 remove_program_space (program_space
*pspace
)
134 program_space
*ss
, **ss_link
;
135 gdb_assert (pspace
!= NULL
);
138 ss_link
= &program_spaces
;
152 /* See progspace.h. */
154 program_space::program_space (address_space
*aspace_
)
155 : num (++last_program_space_num
),
158 program_space_alloc_data (this);
160 add_program_space (this);
163 /* See progspace.h. */
165 program_space::~program_space ()
167 gdb_assert (this != current_program_space
);
169 remove_program_space (this);
171 scoped_restore_current_program_space restore_pspace
;
173 set_current_program_space (this);
175 breakpoint_program_space_exit (this);
176 no_shared_libraries (NULL
, 0);
178 free_all_objfiles ();
179 /* Defer breakpoint re-set because we don't want to create new
180 locations for this pspace which we're tearing down. */
181 clear_symtab_users (SYMFILE_DEFER_BP_RESET
);
182 if (!gdbarch_has_shared_address_space (target_gdbarch ()))
183 free_address_space (this->aspace
);
184 clear_section_table (&this->target_sections
);
185 clear_program_space_solib_cache (this);
186 /* Discard any data modules have associated with the PSPACE. */
187 program_space_free_data (this);
190 /* See progspace.h. */
193 program_space::free_all_objfiles ()
197 /* Any objfile reference would become stale. */
198 for (so
= master_so_list (); so
; so
= so
->next
)
199 gdb_assert (so
->objfile
== NULL
);
201 while (!objfiles_list
.empty ())
202 objfiles_list
.front ()->unlink ();
205 /* See progspace.h. */
208 program_space::add_objfile (std::shared_ptr
<objfile
> &&objfile
,
209 struct objfile
*before
)
211 if (before
== nullptr)
212 objfiles_list
.push_back (std::move (objfile
));
215 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
216 [=] (const std::shared_ptr
<::objfile
> &objf
)
218 return objf
.get () == before
;
220 gdb_assert (iter
!= objfiles_list
.end ());
221 objfiles_list
.insert (iter
, std::move (objfile
));
225 /* See progspace.h. */
228 program_space::remove_objfile (struct objfile
*objfile
)
230 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
231 [=] (const std::shared_ptr
<::objfile
> &objf
)
233 return objf
.get () == objfile
;
235 gdb_assert (iter
!= objfiles_list
.end ());
236 objfiles_list
.erase (iter
);
238 if (objfile
== symfile_object_file
)
239 symfile_object_file
= NULL
;
242 /* Copies program space SRC to DEST. Copies the main executable file,
243 and the main symbol file. Returns DEST. */
245 struct program_space
*
246 clone_program_space (struct program_space
*dest
, struct program_space
*src
)
248 scoped_restore_current_program_space restore_pspace
;
250 set_current_program_space (dest
);
252 if (src
->pspace_exec_filename
!= NULL
)
253 exec_file_attach (src
->pspace_exec_filename
, 0);
255 if (src
->symfile_object_file
!= NULL
)
256 symbol_file_add_main (objfile_name (src
->symfile_object_file
),
257 SYMFILE_DEFER_BP_RESET
);
262 /* Sets PSPACE as the current program space. It is the caller's
263 responsibility to make sure that the currently selected
264 inferior/thread matches the selected program space. */
267 set_current_program_space (struct program_space
*pspace
)
269 if (current_program_space
== pspace
)
272 gdb_assert (pspace
!= NULL
);
274 current_program_space
= pspace
;
276 /* Different symbols change our view of the frame chain. */
277 reinit_frame_cache ();
280 /* Returns true iff there's no inferior bound to PSPACE. */
283 program_space_empty_p (struct program_space
*pspace
)
285 if (find_inferior_for_program_space (pspace
) != NULL
)
291 /* Prints the list of program spaces and their details on UIOUT. If
292 REQUESTED is not -1, it's the ID of the pspace that should be
293 printed. Otherwise, all spaces are printed. */
296 print_program_space (struct ui_out
*uiout
, int requested
)
298 struct program_space
*pspace
;
301 /* Compute number of pspaces we will print. */
304 if (requested
!= -1 && pspace
->num
!= requested
)
310 /* There should always be at least one. */
311 gdb_assert (count
> 0);
313 ui_out_emit_table
table_emitter (uiout
, 3, count
, "pspaces");
314 uiout
->table_header (1, ui_left
, "current", "");
315 uiout
->table_header (4, ui_left
, "id", "Id");
316 uiout
->table_header (17, ui_left
, "exec", "Executable");
317 uiout
->table_body ();
321 struct inferior
*inf
;
324 if (requested
!= -1 && requested
!= pspace
->num
)
327 ui_out_emit_tuple
tuple_emitter (uiout
, NULL
);
329 if (pspace
== current_program_space
)
330 uiout
->field_string ("current", "*");
332 uiout
->field_skip ("current");
334 uiout
->field_signed ("id", pspace
->num
);
336 if (pspace
->pspace_exec_filename
)
337 uiout
->field_string ("exec", pspace
->pspace_exec_filename
);
339 uiout
->field_skip ("exec");
341 /* Print extra info that doesn't really fit in tabular form.
342 Currently, we print the list of inferiors bound to a pspace.
343 There can be more than one inferior bound to the same pspace,
344 e.g., both parent/child inferiors in a vfork, or, on targets
345 that share pspaces between inferiors. */
347 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
348 if (inf
->pspace
== pspace
)
353 printf_filtered ("\n\tBound inferiors: ID %d (%s)",
355 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
358 printf_filtered (", ID %d (%s)",
360 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
367 /* Boolean test for an already-known program space id. */
370 valid_program_space_id (int num
)
372 struct program_space
*pspace
;
375 if (pspace
->num
== num
)
381 /* If ARGS is NULL or empty, print information about all program
382 spaces. Otherwise, ARGS is a text representation of a LONG
383 indicating which the program space to print information about. */
386 maintenance_info_program_spaces_command (const char *args
, int from_tty
)
392 requested
= parse_and_eval_long (args
);
393 if (!valid_program_space_id (requested
))
394 error (_("program space ID %d not known."), requested
);
397 print_program_space (current_uiout
, requested
);
400 /* Simply returns the count of program spaces. */
403 number_of_program_spaces (void)
405 struct program_space
*pspace
;
414 /* Update all program spaces matching to address spaces. The user may
415 have created several program spaces, and loaded executables into
416 them before connecting to the target interface that will create the
417 inferiors. All that happens before GDB has a chance to know if the
418 inferiors will share an address space or not. Call this after
419 having connected to the target interface and having fetched the
420 target description, to fixup the program/address spaces mappings.
422 It is assumed that there are no bound inferiors yet, otherwise,
423 they'd be left with stale referenced to released aspaces. */
426 update_address_spaces (void)
428 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
429 struct program_space
*pspace
;
430 struct inferior
*inf
;
432 init_address_spaces ();
436 struct address_space
*aspace
= new_address_space ();
438 free_address_space (current_program_space
->aspace
);
440 pspace
->aspace
= aspace
;
445 free_address_space (pspace
->aspace
);
446 pspace
->aspace
= new_address_space ();
449 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
450 if (gdbarch_has_global_solist (target_gdbarch ()))
451 inf
->aspace
= maybe_new_address_space ();
453 inf
->aspace
= inf
->pspace
->aspace
;
458 /* See progspace.h. */
461 clear_program_space_solib_cache (struct program_space
*pspace
)
463 pspace
->added_solibs
.clear ();
464 pspace
->deleted_solibs
.clear ();
470 initialize_progspace (void)
472 add_cmd ("program-spaces", class_maintenance
,
473 maintenance_info_program_spaces_command
,
474 _("Info about currently known program spaces."),
475 &maintenanceinfolist
);
477 /* There's always one program space. Note that this function isn't
478 an automatic _initialize_foo function, since other
479 _initialize_foo routines may need to install their per-pspace
480 data keys. We can only allocate a progspace when all those
481 modules have done that. Do this before
482 initialize_current_architecture, because that accesses exec_bfd,
483 which in turn dereferences current_program_space. */
484 current_program_space
= new program_space (new_address_space ());