/* Program and address space management, for GDB, the GNU debugger. Copyright (C) 2009-2020 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include "defs.h" #include "gdbcmd.h" #include "objfiles.h" #include "arch-utils.h" #include "gdbcore.h" #include "solib.h" #include "solist.h" #include "gdbthread.h" #include "inferior.h" #include /* The last program space number assigned. */ int last_program_space_num = 0; /* The head of the program spaces list. */ struct program_space *program_spaces; /* Pointer to the current program space. */ struct program_space *current_program_space; /* The last address space number assigned. */ static int highest_address_space_num; /* Keep a registry of per-program_space data-pointers required by other GDB modules. */ DEFINE_REGISTRY (program_space, REGISTRY_ACCESS_FIELD) /* Keep a registry of per-address_space data-pointers required by other GDB modules. */ DEFINE_REGISTRY (address_space, REGISTRY_ACCESS_FIELD) /* Create a new address space object, and add it to the list. */ struct address_space * new_address_space (void) { struct address_space *aspace; aspace = XCNEW (struct address_space); aspace->num = ++highest_address_space_num; address_space_alloc_data (aspace); return aspace; } /* Maybe create a new address space object, and add it to the list, or return a pointer to an existing address space, in case inferiors share an address space on this target system. */ struct address_space * maybe_new_address_space (void) { int shared_aspace = gdbarch_has_shared_address_space (target_gdbarch ()); if (shared_aspace) { /* Just return the first in the list. */ return program_spaces->aspace; } return new_address_space (); } static void free_address_space (struct address_space *aspace) { address_space_free_data (aspace); xfree (aspace); } int address_space_num (struct address_space *aspace) { return aspace->num; } /* Start counting over from scratch. */ static void init_address_spaces (void) { highest_address_space_num = 0; } /* Adds a new empty program space to the program space list, and binds it to ASPACE. Returns the pointer to the new object. */ program_space::program_space (address_space *aspace_) : num (++last_program_space_num), aspace (aspace_) { program_space_alloc_data (this); if (program_spaces == NULL) program_spaces = this; else { struct program_space *last; for (last = program_spaces; last->next != NULL; last = last->next) ; last->next = this; } } /* Releases program space PSPACE, and all its contents (shared libraries, objfiles, and any other references to the PSPACE in other modules). It is an internal error to call this when PSPACE is the current program space, since there should always be a program space. */ program_space::~program_space () { gdb_assert (this != current_program_space); scoped_restore_current_program_space restore_pspace; set_current_program_space (this); breakpoint_program_space_exit (this); no_shared_libraries (NULL, 0); exec_close (); free_all_objfiles (); if (!gdbarch_has_shared_address_space (target_gdbarch ())) free_address_space (this->aspace); clear_section_table (&this->target_sections); clear_program_space_solib_cache (this); /* Discard any data modules have associated with the PSPACE. */ program_space_free_data (this); } /* See progspace.h. */ void program_space::free_all_objfiles () { struct so_list *so; /* Any objfile reference would become stale. */ for (so = master_so_list (); so; so = so->next) gdb_assert (so->objfile == NULL); while (!objfiles_list.empty ()) objfiles_list.front ()->unlink (); clear_symtab_users (0); } /* See progspace.h. */ void program_space::add_objfile (std::shared_ptr &&objfile, struct objfile *before) { if (before == nullptr) objfiles_list.push_back (std::move (objfile)); else { auto iter = std::find_if (objfiles_list.begin (), objfiles_list.end (), [=] (const std::shared_ptr<::objfile> &objf) { return objf.get () == before; }); gdb_assert (iter != objfiles_list.end ()); objfiles_list.insert (iter, std::move (objfile)); } } /* See progspace.h. */ void program_space::remove_objfile (struct objfile *objfile) { auto iter = std::find_if (objfiles_list.begin (), objfiles_list.end (), [=] (const std::shared_ptr<::objfile> &objf) { return objf.get () == objfile; }); gdb_assert (iter != objfiles_list.end ()); objfiles_list.erase (iter); if (objfile == symfile_object_file) symfile_object_file = NULL; } /* Copies program space SRC to DEST. Copies the main executable file, and the main symbol file. Returns DEST. */ struct program_space * clone_program_space (struct program_space *dest, struct program_space *src) { scoped_restore_current_program_space restore_pspace; set_current_program_space (dest); if (src->pspace_exec_filename != NULL) exec_file_attach (src->pspace_exec_filename, 0); if (src->symfile_object_file != NULL) symbol_file_add_main (objfile_name (src->symfile_object_file), SYMFILE_DEFER_BP_RESET); return dest; } /* Sets PSPACE as the current program space. It is the caller's responsibility to make sure that the currently selected inferior/thread matches the selected program space. */ void set_current_program_space (struct program_space *pspace) { if (current_program_space == pspace) return; gdb_assert (pspace != NULL); current_program_space = pspace; /* Different symbols change our view of the frame chain. */ reinit_frame_cache (); } /* Returns true iff there's no inferior bound to PSPACE. */ int program_space_empty_p (struct program_space *pspace) { if (find_inferior_for_program_space (pspace) != NULL) return 0; return 1; } /* Remove a program space from the program spaces list and release it. It is an error to call this function while PSPACE is the current program space. */ void delete_program_space (struct program_space *pspace) { struct program_space *ss, **ss_link; gdb_assert (pspace != NULL); gdb_assert (pspace != current_program_space); ss = program_spaces; ss_link = &program_spaces; while (ss != NULL) { if (ss == pspace) { *ss_link = ss->next; break; } ss_link = &ss->next; ss = *ss_link; } delete pspace; } /* Prints the list of program spaces and their details on UIOUT. If REQUESTED is not -1, it's the ID of the pspace that should be printed. Otherwise, all spaces are printed. */ static void print_program_space (struct ui_out *uiout, int requested) { struct program_space *pspace; int count = 0; /* Compute number of pspaces we will print. */ ALL_PSPACES (pspace) { if (requested != -1 && pspace->num != requested) continue; ++count; } /* There should always be at least one. */ gdb_assert (count > 0); ui_out_emit_table table_emitter (uiout, 3, count, "pspaces"); uiout->table_header (1, ui_left, "current", ""); uiout->table_header (4, ui_left, "id", "Id"); uiout->table_header (17, ui_left, "exec", "Executable"); uiout->table_body (); ALL_PSPACES (pspace) { struct inferior *inf; int printed_header; if (requested != -1 && requested != pspace->num) continue; ui_out_emit_tuple tuple_emitter (uiout, NULL); if (pspace == current_program_space) uiout->field_string ("current", "*"); else uiout->field_skip ("current"); uiout->field_signed ("id", pspace->num); if (pspace->pspace_exec_filename) uiout->field_string ("exec", pspace->pspace_exec_filename); else uiout->field_skip ("exec"); /* Print extra info that doesn't really fit in tabular form. Currently, we print the list of inferiors bound to a pspace. There can be more than one inferior bound to the same pspace, e.g., both parent/child inferiors in a vfork, or, on targets that share pspaces between inferiors. */ printed_header = 0; for (inf = inferior_list; inf; inf = inf->next) if (inf->pspace == pspace) { if (!printed_header) { printed_header = 1; printf_filtered ("\n\tBound inferiors: ID %d (%s)", inf->num, target_pid_to_str (ptid_t (inf->pid)).c_str ()); } else printf_filtered (", ID %d (%s)", inf->num, target_pid_to_str (ptid_t (inf->pid)).c_str ()); } uiout->text ("\n"); } } /* Boolean test for an already-known program space id. */ static int valid_program_space_id (int num) { struct program_space *pspace; ALL_PSPACES (pspace) if (pspace->num == num) return 1; return 0; } /* If ARGS is NULL or empty, print information about all program spaces. Otherwise, ARGS is a text representation of a LONG indicating which the program space to print information about. */ static void maintenance_info_program_spaces_command (const char *args, int from_tty) { int requested = -1; if (args && *args) { requested = parse_and_eval_long (args); if (!valid_program_space_id (requested)) error (_("program space ID %d not known."), requested); } print_program_space (current_uiout, requested); } /* Simply returns the count of program spaces. */ int number_of_program_spaces (void) { struct program_space *pspace; int count = 0; ALL_PSPACES (pspace) count++; return count; } /* Update all program spaces matching to address spaces. The user may have created several program spaces, and loaded executables into them before connecting to the target interface that will create the inferiors. All that happens before GDB has a chance to know if the inferiors will share an address space or not. Call this after having connected to the target interface and having fetched the target description, to fixup the program/address spaces mappings. It is assumed that there are no bound inferiors yet, otherwise, they'd be left with stale referenced to released aspaces. */ void update_address_spaces (void) { int shared_aspace = gdbarch_has_shared_address_space (target_gdbarch ()); struct program_space *pspace; struct inferior *inf; init_address_spaces (); if (shared_aspace) { struct address_space *aspace = new_address_space (); free_address_space (current_program_space->aspace); ALL_PSPACES (pspace) pspace->aspace = aspace; } else ALL_PSPACES (pspace) { free_address_space (pspace->aspace); pspace->aspace = new_address_space (); } for (inf = inferior_list; inf; inf = inf->next) if (gdbarch_has_global_solist (target_gdbarch ())) inf->aspace = maybe_new_address_space (); else inf->aspace = inf->pspace->aspace; } /* See progspace.h. */ void clear_program_space_solib_cache (struct program_space *pspace) { pspace->added_solibs.clear (); pspace->deleted_solibs.clear (); } void initialize_progspace (void) { add_cmd ("program-spaces", class_maintenance, maintenance_info_program_spaces_command, _("Info about currently known program spaces."), &maintenanceinfolist); /* There's always one program space. Note that this function isn't an automatic _initialize_foo function, since other _initialize_foo routines may need to install their per-pspace data keys. We can only allocate a progspace when all those modules have done that. Do this before initialize_current_architecture, because that accesses exec_bfd, which in turn dereferences current_program_space. */ current_program_space = new program_space (new_address_space ()); }