1 /* Program and address space management, for GDB, the GNU debugger.
3 Copyright (C) 2009-2019 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 /* Adds a new empty program space to the program space list, and binds
113 it to ASPACE. Returns the pointer to the new object. */
115 program_space::program_space (address_space
*aspace_
)
116 : num (++last_program_space_num
), aspace (aspace_
)
118 program_space_alloc_data (this);
120 if (program_spaces
== NULL
)
121 program_spaces
= this;
124 struct program_space
*last
;
126 for (last
= program_spaces
; last
->next
!= NULL
; last
= last
->next
)
132 /* Releases program space PSPACE, and all its contents (shared
133 libraries, objfiles, and any other references to the PSPACE in
134 other modules). It is an internal error to call this when PSPACE
135 is the current program space, since there should always be a
138 program_space::~program_space ()
140 gdb_assert (this != current_program_space
);
142 scoped_restore_current_program_space restore_pspace
;
144 set_current_program_space (this);
146 breakpoint_program_space_exit (this);
147 no_shared_libraries (NULL
, 0);
149 free_all_objfiles ();
150 if (!gdbarch_has_shared_address_space (target_gdbarch ()))
151 free_address_space (this->aspace
);
152 clear_section_table (&this->target_sections
);
153 clear_program_space_solib_cache (this);
154 /* Discard any data modules have associated with the PSPACE. */
155 program_space_free_data (this);
158 /* See progspace.h. */
161 program_space::free_all_objfiles ()
165 /* Any objfile reference would become stale. */
166 for (so
= master_so_list (); so
; so
= so
->next
)
167 gdb_assert (so
->objfile
== NULL
);
169 while (!objfiles_list
.empty ())
170 objfiles_list
.front ()->unlink ();
172 clear_symtab_users (0);
175 /* See progspace.h. */
178 program_space::add_objfile (struct objfile
*objfile
, struct objfile
*before
)
180 if (before
== nullptr)
181 objfiles_list
.push_back (objfile
);
184 auto iter
= std::find (objfiles_list
.begin (), objfiles_list
.end (),
186 gdb_assert (iter
!= objfiles_list
.end ());
187 objfiles_list
.insert (iter
, objfile
);
191 /* See progspace.h. */
194 program_space::remove_objfile (struct objfile
*objfile
)
196 auto iter
= std::find (objfiles_list
.begin (), objfiles_list
.end (),
198 gdb_assert (iter
!= objfiles_list
.end ());
199 objfiles_list
.erase (iter
);
201 if (objfile
== symfile_object_file
)
202 symfile_object_file
= NULL
;
205 /* Copies program space SRC to DEST. Copies the main executable file,
206 and the main symbol file. Returns DEST. */
208 struct program_space
*
209 clone_program_space (struct program_space
*dest
, struct program_space
*src
)
211 scoped_restore_current_program_space restore_pspace
;
213 set_current_program_space (dest
);
215 if (src
->pspace_exec_filename
!= NULL
)
216 exec_file_attach (src
->pspace_exec_filename
, 0);
218 if (src
->symfile_object_file
!= NULL
)
219 symbol_file_add_main (objfile_name (src
->symfile_object_file
),
220 SYMFILE_DEFER_BP_RESET
);
225 /* Sets PSPACE as the current program space. It is the caller's
226 responsibility to make sure that the currently selected
227 inferior/thread matches the selected program space. */
230 set_current_program_space (struct program_space
*pspace
)
232 if (current_program_space
== pspace
)
235 gdb_assert (pspace
!= NULL
);
237 current_program_space
= pspace
;
239 /* Different symbols change our view of the frame chain. */
240 reinit_frame_cache ();
243 /* Returns true iff there's no inferior bound to PSPACE. */
246 program_space_empty_p (struct program_space
*pspace
)
248 if (find_inferior_for_program_space (pspace
) != NULL
)
254 /* Remove a program space from the program spaces list and release it. It is
255 an error to call this function while PSPACE is the current program space. */
258 delete_program_space (struct program_space
*pspace
)
260 struct program_space
*ss
, **ss_link
;
261 gdb_assert (pspace
!= NULL
);
262 gdb_assert (pspace
!= current_program_space
);
265 ss_link
= &program_spaces
;
281 /* Prints the list of program spaces and their details on UIOUT. If
282 REQUESTED is not -1, it's the ID of the pspace that should be
283 printed. Otherwise, all spaces are printed. */
286 print_program_space (struct ui_out
*uiout
, int requested
)
288 struct program_space
*pspace
;
291 /* Compute number of pspaces we will print. */
294 if (requested
!= -1 && pspace
->num
!= requested
)
300 /* There should always be at least one. */
301 gdb_assert (count
> 0);
303 ui_out_emit_table
table_emitter (uiout
, 3, count
, "pspaces");
304 uiout
->table_header (1, ui_left
, "current", "");
305 uiout
->table_header (4, ui_left
, "id", "Id");
306 uiout
->table_header (17, ui_left
, "exec", "Executable");
307 uiout
->table_body ();
311 struct inferior
*inf
;
314 if (requested
!= -1 && requested
!= pspace
->num
)
317 ui_out_emit_tuple
tuple_emitter (uiout
, NULL
);
319 if (pspace
== current_program_space
)
320 uiout
->field_string ("current", "*");
322 uiout
->field_skip ("current");
324 uiout
->field_signed ("id", pspace
->num
);
326 if (pspace
->pspace_exec_filename
)
327 uiout
->field_string ("exec", pspace
->pspace_exec_filename
);
329 uiout
->field_skip ("exec");
331 /* Print extra info that doesn't really fit in tabular form.
332 Currently, we print the list of inferiors bound to a pspace.
333 There can be more than one inferior bound to the same pspace,
334 e.g., both parent/child inferiors in a vfork, or, on targets
335 that share pspaces between inferiors. */
337 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
338 if (inf
->pspace
== pspace
)
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 struct program_space
*pspace
;
365 if (pspace
->num
== num
)
371 /* If ARGS is NULL or empty, print information about all program
372 spaces. Otherwise, ARGS is a text representation of a LONG
373 indicating which the program space to print information about. */
376 maintenance_info_program_spaces_command (const char *args
, int from_tty
)
382 requested
= parse_and_eval_long (args
);
383 if (!valid_program_space_id (requested
))
384 error (_("program space ID %d not known."), requested
);
387 print_program_space (current_uiout
, requested
);
390 /* Simply returns the count of program spaces. */
393 number_of_program_spaces (void)
395 struct program_space
*pspace
;
404 /* Update all program spaces matching to address spaces. The user may
405 have created several program spaces, and loaded executables into
406 them before connecting to the target interface that will create the
407 inferiors. All that happens before GDB has a chance to know if the
408 inferiors will share an address space or not. Call this after
409 having connected to the target interface and having fetched the
410 target description, to fixup the program/address spaces mappings.
412 It is assumed that there are no bound inferiors yet, otherwise,
413 they'd be left with stale referenced to released aspaces. */
416 update_address_spaces (void)
418 int shared_aspace
= gdbarch_has_shared_address_space (target_gdbarch ());
419 struct program_space
*pspace
;
420 struct inferior
*inf
;
422 init_address_spaces ();
426 struct address_space
*aspace
= new_address_space ();
428 free_address_space (current_program_space
->aspace
);
430 pspace
->aspace
= aspace
;
435 free_address_space (pspace
->aspace
);
436 pspace
->aspace
= new_address_space ();
439 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
440 if (gdbarch_has_global_solist (target_gdbarch ()))
441 inf
->aspace
= maybe_new_address_space ();
443 inf
->aspace
= inf
->pspace
->aspace
;
448 /* See progspace.h. */
451 clear_program_space_solib_cache (struct program_space
*pspace
)
453 pspace
->added_solibs
.clear ();
454 pspace
->deleted_solibs
.clear ();
460 initialize_progspace (void)
462 add_cmd ("program-spaces", class_maintenance
,
463 maintenance_info_program_spaces_command
,
464 _("Info about currently known program spaces."),
465 &maintenanceinfolist
);
467 /* There's always one program space. Note that this function isn't
468 an automatic _initialize_foo function, since other
469 _initialize_foo routines may need to install their per-pspace
470 data keys. We can only allocate a progspace when all those
471 modules have done that. Do this before
472 initialize_current_architecture, because that accesses exec_bfd,
473 which in turn dereferences current_program_space. */
474 current_program_space
= new program_space (new_address_space ());