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526 lines
13 KiB
C
526 lines
13 KiB
C
/* Program and address space management, for GDB, the GNU debugger.
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Copyright (C) 2009-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "arch-utils.h"
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#include "gdbcore.h"
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#include "solib.h"
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#include "gdbthread.h"
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/* The last program space number assigned. */
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int last_program_space_num = 0;
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/* The head of the program spaces list. */
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struct program_space *program_spaces;
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/* Pointer to the current program space. */
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struct program_space *current_program_space;
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/* The last address space number assigned. */
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static int highest_address_space_num;
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/* Keep a registry of per-program_space data-pointers required by other GDB
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modules. */
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DEFINE_REGISTRY (program_space, REGISTRY_ACCESS_FIELD)
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/* An address space. It is used for comparing if pspaces/inferior/threads
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see the same address space and for associating caches to each address
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space. */
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struct address_space
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{
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int num;
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/* Per aspace data-pointers required by other GDB modules. */
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REGISTRY_FIELDS;
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};
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/* Keep a registry of per-address_space data-pointers required by other GDB
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modules. */
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DEFINE_REGISTRY (address_space, REGISTRY_ACCESS_FIELD)
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/* Create a new address space object, and add it to the list. */
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struct address_space *
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new_address_space (void)
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{
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struct address_space *aspace;
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aspace = XCNEW (struct address_space);
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aspace->num = ++highest_address_space_num;
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address_space_alloc_data (aspace);
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return aspace;
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}
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/* Maybe create a new address space object, and add it to the list, or
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return a pointer to an existing address space, in case inferiors
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share an address space on this target system. */
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struct address_space *
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maybe_new_address_space (void)
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{
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int shared_aspace = gdbarch_has_shared_address_space (target_gdbarch ());
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if (shared_aspace)
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{
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/* Just return the first in the list. */
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return program_spaces->aspace;
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}
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return new_address_space ();
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}
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static void
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free_address_space (struct address_space *aspace)
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{
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address_space_free_data (aspace);
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xfree (aspace);
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}
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int
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address_space_num (struct address_space *aspace)
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{
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return aspace->num;
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}
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/* Start counting over from scratch. */
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static void
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init_address_spaces (void)
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{
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highest_address_space_num = 0;
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}
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/* Adds a new empty program space to the program space list, and binds
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it to ASPACE. Returns the pointer to the new object. */
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struct program_space *
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add_program_space (struct address_space *aspace)
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{
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struct program_space *pspace;
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pspace = XCNEW (struct program_space);
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pspace->num = ++last_program_space_num;
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pspace->aspace = aspace;
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program_space_alloc_data (pspace);
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pspace->next = program_spaces;
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program_spaces = pspace;
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return pspace;
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}
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/* Releases program space PSPACE, and all its contents (shared
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libraries, objfiles, and any other references to the PSPACE in
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other modules). It is an internal error to call this when PSPACE
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is the current program space, since there should always be a
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program space. */
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static void
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release_program_space (struct program_space *pspace)
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{
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struct cleanup *old_chain = save_current_program_space ();
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gdb_assert (pspace != current_program_space);
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set_current_program_space (pspace);
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breakpoint_program_space_exit (pspace);
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no_shared_libraries (NULL, 0);
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exec_close ();
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free_all_objfiles ();
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if (!gdbarch_has_shared_address_space (target_gdbarch ()))
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free_address_space (pspace->aspace);
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resize_section_table (&pspace->target_sections,
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-resize_section_table (&pspace->target_sections, 0));
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clear_program_space_solib_cache (pspace);
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/* Discard any data modules have associated with the PSPACE. */
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program_space_free_data (pspace);
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xfree (pspace);
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do_cleanups (old_chain);
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}
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/* Copies program space SRC to DEST. Copies the main executable file,
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and the main symbol file. Returns DEST. */
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struct program_space *
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clone_program_space (struct program_space *dest, struct program_space *src)
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{
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struct cleanup *old_chain;
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old_chain = save_current_program_space ();
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set_current_program_space (dest);
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if (src->pspace_exec_filename != NULL)
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exec_file_attach (src->pspace_exec_filename, 0);
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if (src->symfile_object_file != NULL)
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symbol_file_add_main (objfile_name (src->symfile_object_file), 0);
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do_cleanups (old_chain);
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return dest;
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}
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/* Sets PSPACE as the current program space. It is the caller's
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responsibility to make sure that the currently selected
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inferior/thread matches the selected program space. */
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void
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set_current_program_space (struct program_space *pspace)
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{
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if (current_program_space == pspace)
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return;
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gdb_assert (pspace != NULL);
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current_program_space = pspace;
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/* Different symbols change our view of the frame chain. */
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reinit_frame_cache ();
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}
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/* A cleanups callback, helper for save_current_program_space
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below. */
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static void
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restore_program_space (void *arg)
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{
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struct program_space *saved_pspace = arg;
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set_current_program_space (saved_pspace);
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}
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/* Save the current program space so that it may be restored by a later
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call to do_cleanups. Returns the struct cleanup pointer needed for
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later doing the cleanup. */
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struct cleanup *
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save_current_program_space (void)
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{
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struct cleanup *old_chain = make_cleanup (restore_program_space,
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current_program_space);
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return old_chain;
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}
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/* Returns true iff there's no inferior bound to PSPACE. */
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static int
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pspace_empty_p (struct program_space *pspace)
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{
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if (find_inferior_for_program_space (pspace) != NULL)
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return 0;
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return 1;
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}
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/* Prune away automatically added program spaces that aren't required
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anymore. */
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void
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prune_program_spaces (void)
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{
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struct program_space *ss, **ss_link;
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struct program_space *current = current_program_space;
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ss = program_spaces;
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ss_link = &program_spaces;
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while (ss)
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{
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if (ss == current || !pspace_empty_p (ss))
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{
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ss_link = &ss->next;
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ss = *ss_link;
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continue;
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}
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*ss_link = ss->next;
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release_program_space (ss);
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ss = *ss_link;
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}
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}
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/* Prints the list of program spaces and their details on UIOUT. If
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REQUESTED is not -1, it's the ID of the pspace that should be
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printed. Otherwise, all spaces are printed. */
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static void
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print_program_space (struct ui_out *uiout, int requested)
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{
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struct program_space *pspace;
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int count = 0;
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struct cleanup *old_chain;
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/* Might as well prune away unneeded ones, so the user doesn't even
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seem them. */
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prune_program_spaces ();
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/* Compute number of pspaces we will print. */
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ALL_PSPACES (pspace)
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{
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if (requested != -1 && pspace->num != requested)
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continue;
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++count;
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}
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/* There should always be at least one. */
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gdb_assert (count > 0);
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old_chain = make_cleanup_ui_out_table_begin_end (uiout, 3, count, "pspaces");
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ui_out_table_header (uiout, 1, ui_left, "current", "");
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ui_out_table_header (uiout, 4, ui_left, "id", "Id");
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ui_out_table_header (uiout, 17, ui_left, "exec", "Executable");
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ui_out_table_body (uiout);
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ALL_PSPACES (pspace)
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{
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struct cleanup *chain2;
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struct inferior *inf;
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int printed_header;
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if (requested != -1 && requested != pspace->num)
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continue;
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chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
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if (pspace == current_program_space)
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ui_out_field_string (uiout, "current", "*");
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else
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ui_out_field_skip (uiout, "current");
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ui_out_field_int (uiout, "id", pspace->num);
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if (pspace->pspace_exec_filename)
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ui_out_field_string (uiout, "exec", pspace->pspace_exec_filename);
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else
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ui_out_field_skip (uiout, "exec");
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/* Print extra info that doesn't really fit in tabular form.
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Currently, we print the list of inferiors bound to a pspace.
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There can be more than one inferior bound to the same pspace,
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e.g., both parent/child inferiors in a vfork, or, on targets
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that share pspaces between inferiors. */
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printed_header = 0;
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for (inf = inferior_list; inf; inf = inf->next)
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if (inf->pspace == pspace)
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{
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if (!printed_header)
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{
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printed_header = 1;
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printf_filtered ("\n\tBound inferiors: ID %d (%s)",
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inf->num,
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target_pid_to_str (pid_to_ptid (inf->pid)));
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}
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else
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printf_filtered (", ID %d (%s)",
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inf->num,
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target_pid_to_str (pid_to_ptid (inf->pid)));
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}
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ui_out_text (uiout, "\n");
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do_cleanups (chain2);
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}
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do_cleanups (old_chain);
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}
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/* Boolean test for an already-known program space id. */
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static int
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valid_program_space_id (int num)
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{
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struct program_space *pspace;
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ALL_PSPACES (pspace)
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if (pspace->num == num)
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return 1;
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return 0;
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}
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/* If ARGS is NULL or empty, print information about all program
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spaces. Otherwise, ARGS is a text representation of a LONG
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indicating which the program space to print information about. */
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static void
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maintenance_info_program_spaces_command (char *args, int from_tty)
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{
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int requested = -1;
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if (args && *args)
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{
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requested = parse_and_eval_long (args);
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if (!valid_program_space_id (requested))
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error (_("program space ID %d not known."), requested);
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}
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print_program_space (current_uiout, requested);
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}
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/* Simply returns the count of program spaces. */
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int
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number_of_program_spaces (void)
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{
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struct program_space *pspace;
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int count = 0;
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ALL_PSPACES (pspace)
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count++;
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return count;
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}
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/* Update all program spaces matching to address spaces. The user may
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have created several program spaces, and loaded executables into
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them before connecting to the target interface that will create the
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inferiors. All that happens before GDB has a chance to know if the
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inferiors will share an address space or not. Call this after
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having connected to the target interface and having fetched the
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target description, to fixup the program/address spaces mappings.
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It is assumed that there are no bound inferiors yet, otherwise,
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they'd be left with stale referenced to released aspaces. */
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void
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update_address_spaces (void)
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{
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int shared_aspace = gdbarch_has_shared_address_space (target_gdbarch ());
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struct program_space *pspace;
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struct inferior *inf;
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init_address_spaces ();
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if (shared_aspace)
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{
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struct address_space *aspace = new_address_space ();
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free_address_space (current_program_space->aspace);
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ALL_PSPACES (pspace)
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pspace->aspace = aspace;
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}
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else
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ALL_PSPACES (pspace)
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{
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free_address_space (pspace->aspace);
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pspace->aspace = new_address_space ();
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}
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for (inf = inferior_list; inf; inf = inf->next)
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if (gdbarch_has_global_solist (target_gdbarch ()))
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inf->aspace = maybe_new_address_space ();
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else
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inf->aspace = inf->pspace->aspace;
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}
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/* Save the current program space so that it may be restored by a later
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call to do_cleanups. Returns the struct cleanup pointer needed for
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later doing the cleanup. */
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struct cleanup *
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save_current_space_and_thread (void)
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{
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struct cleanup *old_chain;
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/* If restoring to null thread, we need to restore the pspace as
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well, hence, we need to save the current program space first. */
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old_chain = save_current_program_space ();
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/* There's no need to save the current inferior here.
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That is handled by make_cleanup_restore_current_thread. */
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make_cleanup_restore_current_thread ();
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return old_chain;
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}
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/* Switches full context to program space PSPACE. Switches to the
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first thread found bound to PSPACE. */
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void
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switch_to_program_space_and_thread (struct program_space *pspace)
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{
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struct inferior *inf;
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inf = find_inferior_for_program_space (pspace);
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if (inf != NULL)
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{
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struct thread_info *tp;
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tp = any_live_thread_of_process (inf->pid);
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if (tp != NULL)
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{
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switch_to_thread (tp->ptid);
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/* Switching thread switches pspace implicitly. We're
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done. */
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return;
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}
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}
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switch_to_thread (null_ptid);
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set_current_program_space (pspace);
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}
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/* See progspace.h. */
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void
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clear_program_space_solib_cache (struct program_space *pspace)
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{
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VEC_free (so_list_ptr, pspace->added_solibs);
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free_char_ptr_vec (pspace->deleted_solibs);
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pspace->deleted_solibs = NULL;
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}
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void
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initialize_progspace (void)
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{
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add_cmd ("program-spaces", class_maintenance,
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maintenance_info_program_spaces_command,
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_("Info about currently known program spaces."),
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&maintenanceinfolist);
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/* There's always one program space. Note that this function isn't
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an automatic _initialize_foo function, since other
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_initialize_foo routines may need to install their per-pspace
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data keys. We can only allocate a progspace when all those
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modules have done that. Do this before
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initialize_current_architecture, because that accesses exec_bfd,
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which in turn dereferences current_program_space. */
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current_program_space = add_program_space (new_address_space ());
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}
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