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);
150 free_all_objfiles ();
151 /* Defer breakpoint re-set because we don't want to create new
152 locations for this pspace which we're tearing down. */
153 clear_symtab_users (SYMFILE_DEFER_BP_RESET
);
154 if (!gdbarch_has_shared_address_space (target_gdbarch ()))
155 free_address_space (this->aspace
);
156 /* Discard any data modules have associated with the PSPACE. */
157 program_space_free_data (this);
160 /* See progspace.h. */
163 program_space::free_all_objfiles ()
165 /* Any objfile reference would become stale. */
166 for (struct so_list
*so
: current_program_space
->solibs ())
167 gdb_assert (so
->objfile
== NULL
);
169 while (!objfiles_list
.empty ())
170 objfiles_list
.front ()->unlink ();
173 /* See progspace.h. */
176 program_space::add_objfile (std::shared_ptr
<objfile
> &&objfile
,
177 struct objfile
*before
)
179 if (before
== nullptr)
180 objfiles_list
.push_back (std::move (objfile
));
183 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
184 [=] (const std::shared_ptr
<::objfile
> &objf
)
186 return objf
.get () == before
;
188 gdb_assert (iter
!= objfiles_list
.end ());
189 objfiles_list
.insert (iter
, std::move (objfile
));
193 /* See progspace.h. */
196 program_space::remove_objfile (struct objfile
*objfile
)
198 /* Removing an objfile from the objfile list invalidates any frame
199 that was built using frame info found in the objfile. Reinit the
200 frame cache to get rid of any frame that might otherwise
201 reference stale info. */
202 reinit_frame_cache ();
204 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
205 [=] (const std::shared_ptr
<::objfile
> &objf
)
207 return objf
.get () == objfile
;
209 gdb_assert (iter
!= objfiles_list
.end ());
210 objfiles_list
.erase (iter
);
212 if (objfile
== symfile_object_file
)
213 symfile_object_file
= NULL
;
216 /* See progspace.h. */
218 next_adapter
<struct so_list
>
219 program_space::solibs () const
221 return next_adapter
<struct so_list
> (this->so_list
);
224 /* See progspace.h. */
227 program_space::exec_close ()
231 /* Removing target sections may close the exec_ops target.
232 Clear ebfd before doing so to prevent recursion. */
233 ebfd
.reset (nullptr);
236 remove_target_sections (&ebfd
);
238 exec_filename
.reset (nullptr);
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
->exec_filename
!= NULL
)
253 exec_file_attach (src
->exec_filename
.get (), 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 ()
285 return find_inferior_for_program_space (this) == nullptr;
288 /* Prints the list of program spaces and their details on UIOUT. If
289 REQUESTED is not -1, it's the ID of the pspace that should be
290 printed. Otherwise, all spaces are printed. */
293 print_program_space (struct ui_out
*uiout
, int requested
)
297 /* Compute number of pspaces we will print. */
298 for (struct program_space
*pspace
: program_spaces
)
300 if (requested
!= -1 && pspace
->num
!= requested
)
306 /* There should always be at least one. */
307 gdb_assert (count
> 0);
309 ui_out_emit_table
table_emitter (uiout
, 3, count
, "pspaces");
310 uiout
->table_header (1, ui_left
, "current", "");
311 uiout
->table_header (4, ui_left
, "id", "Id");
312 uiout
->table_header (17, ui_left
, "exec", "Executable");
313 uiout
->table_body ();
315 for (struct program_space
*pspace
: program_spaces
)
319 if (requested
!= -1 && requested
!= pspace
->num
)
322 ui_out_emit_tuple
tuple_emitter (uiout
, NULL
);
324 if (pspace
== current_program_space
)
325 uiout
->field_string ("current", "*");
327 uiout
->field_skip ("current");
329 uiout
->field_signed ("id", pspace
->num
);
331 if (pspace
->exec_filename
!= nullptr)
332 uiout
->field_string ("exec", pspace
->exec_filename
.get ());
334 uiout
->field_skip ("exec");
336 /* Print extra info that doesn't really fit in tabular form.
337 Currently, we print the list of inferiors bound to a pspace.
338 There can be more than one inferior bound to the same pspace,
339 e.g., both parent/child inferiors in a vfork, or, on targets
340 that share pspaces between inferiors. */
343 /* We're going to switch inferiors. */
344 scoped_restore_current_thread restore_thread
;
346 for (inferior
*inf
: all_inferiors ())
347 if (inf
->pspace
== pspace
)
349 /* Switch to inferior in order to call target methods. */
350 switch_to_inferior_no_thread (inf
);
355 printf_filtered ("\n\tBound inferiors: ID %d (%s)",
357 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
360 printf_filtered (", ID %d (%s)",
362 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
369 /* Boolean test for an already-known program space id. */
372 valid_program_space_id (int num
)
374 for (struct program_space
*pspace
: program_spaces
)
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 /* Update all program spaces matching to address spaces. The user may
401 have created several program spaces, and loaded executables into
402 them before connecting to the target interface that will create the
403 inferiors. All that happens before GDB has a chance to know if the
404 inferiors will share an address space or not. Call this after
405 having connected to the target interface and having fetched the
406 target description, to fixup the program/address spaces mappings.
408 It is assumed that there are no bound inferiors yet, otherwise,
409 they'd be left with stale referenced to released aspaces. */
412 update_address_spaces (void)
414 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
415 struct inferior
*inf
;
417 init_address_spaces ();
421 struct address_space
*aspace
= new_address_space ();
423 free_address_space (current_program_space
->aspace
);
424 for (struct program_space
*pspace
: program_spaces
)
425 pspace
->aspace
= aspace
;
428 for (struct program_space
*pspace
: program_spaces
)
430 free_address_space (pspace
->aspace
);
431 pspace
->aspace
= new_address_space ();
434 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
435 if (gdbarch_has_global_solist (target_gdbarch ()))
436 inf
->aspace
= maybe_new_address_space ();
438 inf
->aspace
= inf
->pspace
->aspace
;
443 /* See progspace.h. */
446 program_space::clear_solib_cache ()
448 added_solibs
.clear ();
449 deleted_solibs
.clear ();
455 initialize_progspace (void)
457 add_cmd ("program-spaces", class_maintenance
,
458 maintenance_info_program_spaces_command
,
459 _("Info about currently known program spaces."),
460 &maintenanceinfolist
);
462 /* There's always one program space. Note that this function isn't
463 an automatic _initialize_foo function, since other
464 _initialize_foo routines may need to install their per-pspace
465 data keys. We can only allocate a progspace when all those
466 modules have done that. Do this before
467 initialize_current_architecture, because that accesses the ebfd
468 of current_program_space. */
469 current_program_space
= new program_space (new_address_space ());