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_section_table (&this->target_sections
);
158 clear_program_space_solib_cache (this);
159 /* Discard any data modules have associated with the PSPACE. */
160 program_space_free_data (this);
163 /* See progspace.h. */
166 program_space::free_all_objfiles ()
168 /* Any objfile reference would become stale. */
169 for (struct so_list
*so
: current_program_space
->solibs ())
170 gdb_assert (so
->objfile
== NULL
);
172 while (!objfiles_list
.empty ())
173 objfiles_list
.front ()->unlink ();
176 /* See progspace.h. */
179 program_space::add_objfile (std::shared_ptr
<objfile
> &&objfile
,
180 struct objfile
*before
)
182 if (before
== nullptr)
183 objfiles_list
.push_back (std::move (objfile
));
186 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
187 [=] (const std::shared_ptr
<::objfile
> &objf
)
189 return objf
.get () == before
;
191 gdb_assert (iter
!= objfiles_list
.end ());
192 objfiles_list
.insert (iter
, std::move (objfile
));
196 /* See progspace.h. */
199 program_space::remove_objfile (struct objfile
*objfile
)
201 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
202 [=] (const std::shared_ptr
<::objfile
> &objf
)
204 return objf
.get () == objfile
;
206 gdb_assert (iter
!= objfiles_list
.end ());
207 objfiles_list
.erase (iter
);
209 if (objfile
== symfile_object_file
)
210 symfile_object_file
= NULL
;
213 /* See progspace.h. */
215 next_adapter
<struct so_list
>
216 program_space::solibs () const
218 return next_adapter
<struct so_list
> (this->so_list
);
221 /* Copies program space SRC to DEST. Copies the main executable file,
222 and the main symbol file. Returns DEST. */
224 struct program_space
*
225 clone_program_space (struct program_space
*dest
, struct program_space
*src
)
227 scoped_restore_current_program_space restore_pspace
;
229 set_current_program_space (dest
);
231 if (src
->pspace_exec_filename
!= NULL
)
232 exec_file_attach (src
->pspace_exec_filename
, 0);
234 if (src
->symfile_object_file
!= NULL
)
235 symbol_file_add_main (objfile_name (src
->symfile_object_file
),
236 SYMFILE_DEFER_BP_RESET
);
241 /* Sets PSPACE as the current program space. It is the caller's
242 responsibility to make sure that the currently selected
243 inferior/thread matches the selected program space. */
246 set_current_program_space (struct program_space
*pspace
)
248 if (current_program_space
== pspace
)
251 gdb_assert (pspace
!= NULL
);
253 current_program_space
= pspace
;
255 /* Different symbols change our view of the frame chain. */
256 reinit_frame_cache ();
259 /* Returns true iff there's no inferior bound to PSPACE. */
262 program_space_empty_p (struct program_space
*pspace
)
264 if (find_inferior_for_program_space (pspace
) != NULL
)
270 /* Prints the list of program spaces and their details on UIOUT. If
271 REQUESTED is not -1, it's the ID of the pspace that should be
272 printed. Otherwise, all spaces are printed. */
275 print_program_space (struct ui_out
*uiout
, int requested
)
279 /* Compute number of pspaces we will print. */
280 for (struct program_space
*pspace
: program_spaces
)
282 if (requested
!= -1 && pspace
->num
!= requested
)
288 /* There should always be at least one. */
289 gdb_assert (count
> 0);
291 ui_out_emit_table
table_emitter (uiout
, 3, count
, "pspaces");
292 uiout
->table_header (1, ui_left
, "current", "");
293 uiout
->table_header (4, ui_left
, "id", "Id");
294 uiout
->table_header (17, ui_left
, "exec", "Executable");
295 uiout
->table_body ();
297 for (struct program_space
*pspace
: program_spaces
)
299 struct inferior
*inf
;
302 if (requested
!= -1 && requested
!= pspace
->num
)
305 ui_out_emit_tuple
tuple_emitter (uiout
, NULL
);
307 if (pspace
== current_program_space
)
308 uiout
->field_string ("current", "*");
310 uiout
->field_skip ("current");
312 uiout
->field_signed ("id", pspace
->num
);
314 if (pspace
->pspace_exec_filename
)
315 uiout
->field_string ("exec", pspace
->pspace_exec_filename
);
317 uiout
->field_skip ("exec");
319 /* Print extra info that doesn't really fit in tabular form.
320 Currently, we print the list of inferiors bound to a pspace.
321 There can be more than one inferior bound to the same pspace,
322 e.g., both parent/child inferiors in a vfork, or, on targets
323 that share pspaces between inferiors. */
325 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
326 if (inf
->pspace
== pspace
)
331 printf_filtered ("\n\tBound inferiors: ID %d (%s)",
333 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
336 printf_filtered (", ID %d (%s)",
338 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
345 /* Boolean test for an already-known program space id. */
348 valid_program_space_id (int num
)
350 for (struct program_space
*pspace
: program_spaces
)
351 if (pspace
->num
== num
)
357 /* If ARGS is NULL or empty, print information about all program
358 spaces. Otherwise, ARGS is a text representation of a LONG
359 indicating which the program space to print information about. */
362 maintenance_info_program_spaces_command (const char *args
, int from_tty
)
368 requested
= parse_and_eval_long (args
);
369 if (!valid_program_space_id (requested
))
370 error (_("program space ID %d not known."), requested
);
373 print_program_space (current_uiout
, requested
);
376 /* Update all program spaces matching to address spaces. The user may
377 have created several program spaces, and loaded executables into
378 them before connecting to the target interface that will create the
379 inferiors. All that happens before GDB has a chance to know if the
380 inferiors will share an address space or not. Call this after
381 having connected to the target interface and having fetched the
382 target description, to fixup the program/address spaces mappings.
384 It is assumed that there are no bound inferiors yet, otherwise,
385 they'd be left with stale referenced to released aspaces. */
388 update_address_spaces (void)
390 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
391 struct inferior
*inf
;
393 init_address_spaces ();
397 struct address_space
*aspace
= new_address_space ();
399 free_address_space (current_program_space
->aspace
);
400 for (struct program_space
*pspace
: program_spaces
)
401 pspace
->aspace
= aspace
;
404 for (struct program_space
*pspace
: program_spaces
)
406 free_address_space (pspace
->aspace
);
407 pspace
->aspace
= new_address_space ();
410 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
411 if (gdbarch_has_global_solist (target_gdbarch ()))
412 inf
->aspace
= maybe_new_address_space ();
414 inf
->aspace
= inf
->pspace
->aspace
;
419 /* See progspace.h. */
422 clear_program_space_solib_cache (struct program_space
*pspace
)
424 pspace
->added_solibs
.clear ();
425 pspace
->deleted_solibs
.clear ();
431 initialize_progspace (void)
433 add_cmd ("program-spaces", class_maintenance
,
434 maintenance_info_program_spaces_command
,
435 _("Info about currently known program spaces."),
436 &maintenanceinfolist
);
438 /* There's always one program space. Note that this function isn't
439 an automatic _initialize_foo function, since other
440 _initialize_foo routines may need to install their per-pspace
441 data keys. We can only allocate a progspace when all those
442 modules have done that. Do this before
443 initialize_current_architecture, because that accesses exec_bfd,
444 which in turn dereferences current_program_space. */
445 current_program_space
= new program_space (new_address_space ());