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 /* Removing an objfile from the objfile list invalidates any frame
202 that was built using frame info found in the objfile. Reinit the
203 frame cache to get rid of any frame that might otherwise
204 reference stale info. */
205 reinit_frame_cache ();
207 auto iter
= std::find_if (objfiles_list
.begin (), objfiles_list
.end (),
208 [=] (const std::shared_ptr
<::objfile
> &objf
)
210 return objf
.get () == objfile
;
212 gdb_assert (iter
!= objfiles_list
.end ());
213 objfiles_list
.erase (iter
);
215 if (objfile
== symfile_object_file
)
216 symfile_object_file
= NULL
;
219 /* See progspace.h. */
221 next_adapter
<struct so_list
>
222 program_space::solibs () const
224 return next_adapter
<struct so_list
> (this->so_list
);
227 /* Copies program space SRC to DEST. Copies the main executable file,
228 and the main symbol file. Returns DEST. */
230 struct program_space
*
231 clone_program_space (struct program_space
*dest
, struct program_space
*src
)
233 scoped_restore_current_program_space restore_pspace
;
235 set_current_program_space (dest
);
237 if (src
->pspace_exec_filename
!= NULL
)
238 exec_file_attach (src
->pspace_exec_filename
, 0);
240 if (src
->symfile_object_file
!= NULL
)
241 symbol_file_add_main (objfile_name (src
->symfile_object_file
),
242 SYMFILE_DEFER_BP_RESET
);
247 /* Sets PSPACE as the current program space. It is the caller's
248 responsibility to make sure that the currently selected
249 inferior/thread matches the selected program space. */
252 set_current_program_space (struct program_space
*pspace
)
254 if (current_program_space
== pspace
)
257 gdb_assert (pspace
!= NULL
);
259 current_program_space
= pspace
;
261 /* Different symbols change our view of the frame chain. */
262 reinit_frame_cache ();
265 /* Returns true iff there's no inferior bound to PSPACE. */
268 program_space_empty_p (struct program_space
*pspace
)
270 if (find_inferior_for_program_space (pspace
) != NULL
)
276 /* Prints the list of program spaces and their details on UIOUT. If
277 REQUESTED is not -1, it's the ID of the pspace that should be
278 printed. Otherwise, all spaces are printed. */
281 print_program_space (struct ui_out
*uiout
, int requested
)
285 /* Compute number of pspaces we will print. */
286 for (struct program_space
*pspace
: program_spaces
)
288 if (requested
!= -1 && pspace
->num
!= requested
)
294 /* There should always be at least one. */
295 gdb_assert (count
> 0);
297 ui_out_emit_table
table_emitter (uiout
, 3, count
, "pspaces");
298 uiout
->table_header (1, ui_left
, "current", "");
299 uiout
->table_header (4, ui_left
, "id", "Id");
300 uiout
->table_header (17, ui_left
, "exec", "Executable");
301 uiout
->table_body ();
303 for (struct program_space
*pspace
: program_spaces
)
307 if (requested
!= -1 && requested
!= pspace
->num
)
310 ui_out_emit_tuple
tuple_emitter (uiout
, NULL
);
312 if (pspace
== current_program_space
)
313 uiout
->field_string ("current", "*");
315 uiout
->field_skip ("current");
317 uiout
->field_signed ("id", pspace
->num
);
319 if (pspace
->pspace_exec_filename
)
320 uiout
->field_string ("exec", pspace
->pspace_exec_filename
);
322 uiout
->field_skip ("exec");
324 /* Print extra info that doesn't really fit in tabular form.
325 Currently, we print the list of inferiors bound to a pspace.
326 There can be more than one inferior bound to the same pspace,
327 e.g., both parent/child inferiors in a vfork, or, on targets
328 that share pspaces between inferiors. */
331 /* We're going to switch inferiors. */
332 scoped_restore_current_thread restore_thread
;
334 for (inferior
*inf
: all_inferiors ())
335 if (inf
->pspace
== pspace
)
337 /* Switch to inferior in order to call target methods. */
338 switch_to_inferior_no_thread (inf
);
343 printf_filtered ("\n\tBound inferiors: ID %d (%s)",
345 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
348 printf_filtered (", ID %d (%s)",
350 target_pid_to_str (ptid_t (inf
->pid
)).c_str ());
357 /* Boolean test for an already-known program space id. */
360 valid_program_space_id (int num
)
362 for (struct program_space
*pspace
: program_spaces
)
363 if (pspace
->num
== num
)
369 /* If ARGS is NULL or empty, print information about all program
370 spaces. Otherwise, ARGS is a text representation of a LONG
371 indicating which the program space to print information about. */
374 maintenance_info_program_spaces_command (const char *args
, int from_tty
)
380 requested
= parse_and_eval_long (args
);
381 if (!valid_program_space_id (requested
))
382 error (_("program space ID %d not known."), requested
);
385 print_program_space (current_uiout
, requested
);
388 /* Update all program spaces matching to address spaces. The user may
389 have created several program spaces, and loaded executables into
390 them before connecting to the target interface that will create the
391 inferiors. All that happens before GDB has a chance to know if the
392 inferiors will share an address space or not. Call this after
393 having connected to the target interface and having fetched the
394 target description, to fixup the program/address spaces mappings.
396 It is assumed that there are no bound inferiors yet, otherwise,
397 they'd be left with stale referenced to released aspaces. */
400 update_address_spaces (void)
402 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
403 struct inferior
*inf
;
405 init_address_spaces ();
409 struct address_space
*aspace
= new_address_space ();
411 free_address_space (current_program_space
->aspace
);
412 for (struct program_space
*pspace
: program_spaces
)
413 pspace
->aspace
= aspace
;
416 for (struct program_space
*pspace
: program_spaces
)
418 free_address_space (pspace
->aspace
);
419 pspace
->aspace
= new_address_space ();
422 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
423 if (gdbarch_has_global_solist (target_gdbarch ()))
424 inf
->aspace
= maybe_new_address_space ();
426 inf
->aspace
= inf
->pspace
->aspace
;
431 /* See progspace.h. */
434 clear_program_space_solib_cache (struct program_space
*pspace
)
436 pspace
->added_solibs
.clear ();
437 pspace
->deleted_solibs
.clear ();
443 initialize_progspace (void)
445 add_cmd ("program-spaces", class_maintenance
,
446 maintenance_info_program_spaces_command
,
447 _("Info about currently known program spaces."),
448 &maintenanceinfolist
);
450 /* There's always one program space. Note that this function isn't
451 an automatic _initialize_foo function, since other
452 _initialize_foo routines may need to install their per-pspace
453 data keys. We can only allocate a progspace when all those
454 modules have done that. Do this before
455 initialize_current_architecture, because that accesses exec_bfd,
456 which in turn dereferences current_program_space. */
457 current_program_space
= new program_space (new_address_space ());