binutils-gdb/gdb/inferior.c

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/* Multi-process control for GDB, the GNU debugger.
Copyright (C) 2008, 2009, 2010 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 <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "exec.h"
#include "inferior.h"
#include "target.h"
#include "command.h"
#include "gdbcmd.h"
#include "gdbthread.h"
#include "ui-out.h"
#include "observer.h"
#include "gdbthread.h"
#include "gdbcore.h"
#include "symfile.h"
#include "environ.h"
void _initialize_inferiors (void);
static void inferior_alloc_data (struct inferior *inf);
static void inferior_free_data (struct inferior *inf);
struct inferior *inferior_list = NULL;
static int highest_inferior_num;
/* Print notices on inferior events (attach, detach, etc.), set with
`set print inferior-events'. */
static int print_inferior_events = 0;
/* The Current Inferior. */
static struct inferior *current_inferior_ = NULL;
struct inferior*
current_inferior (void)
{
return current_inferior_;
}
void
set_current_inferior (struct inferior *inf)
{
/* There's always an inferior. */
gdb_assert (inf != NULL);
current_inferior_ = inf;
}
/* A cleanups callback, helper for save_current_program_space
below. */
static void
restore_inferior (void *arg)
{
struct inferior *saved_inferior = arg;
set_current_inferior (saved_inferior);
}
/* Save the current program space so that it may be restored by a later
call to do_cleanups. Returns the struct cleanup pointer needed for
later doing the cleanup. */
struct cleanup *
save_current_inferior (void)
{
struct cleanup *old_chain = make_cleanup (restore_inferior,
current_inferior_);
return old_chain;
}
static void
free_inferior (struct inferior *inf)
{
discard_all_inferior_continuations (inf);
inferior_free_data (inf);
xfree (inf->args);
xfree (inf->terminal);
free_environ (inf->environment);
xfree (inf->private);
xfree (inf);
}
void
init_inferior_list (void)
{
struct inferior *inf, *infnext;
highest_inferior_num = 0;
if (!inferior_list)
return;
for (inf = inferior_list; inf; inf = infnext)
{
infnext = inf->next;
free_inferior (inf);
}
inferior_list = NULL;
}
struct inferior *
add_inferior_silent (int pid)
{
struct inferior *inf;
inf = xmalloc (sizeof (*inf));
memset (inf, 0, sizeof (*inf));
inf->pid = pid;
inf->stop_soon = NO_STOP_QUIETLY;
inf->num = ++highest_inferior_num;
inf->next = inferior_list;
inferior_list = inf;
inf->environment = make_environ ();
init_environ (inf->environment);
inferior_alloc_data (inf);
if (pid != 0)
inferior_appeared (inf, pid);
return inf;
}
struct inferior *
add_inferior (int pid)
{
struct inferior *inf = add_inferior_silent (pid);
if (print_inferior_events)
printf_unfiltered (_("[New inferior %d]\n"), pid);
return inf;
}
struct delete_thread_of_inferior_arg
{
int pid;
int silent;
};
static int
delete_thread_of_inferior (struct thread_info *tp, void *data)
{
struct delete_thread_of_inferior_arg *arg = data;
if (ptid_get_pid (tp->ptid) == arg->pid)
{
if (arg->silent)
delete_thread_silent (tp->ptid);
else
delete_thread (tp->ptid);
}
return 0;
}
void
delete_threads_of_inferior (int pid)
{
struct inferior *inf;
struct delete_thread_of_inferior_arg arg;
for (inf = inferior_list; inf; inf = inf->next)
if (inf->pid == pid)
break;
if (!inf)
return;
arg.pid = pid;
arg.silent = 1;
iterate_over_threads (delete_thread_of_inferior, &arg);
}
/* If SILENT then be quiet -- don't announce a inferior death, or the
exit of its threads. */
static void
delete_inferior_1 (struct inferior *todel, int silent)
{
struct inferior *inf, *infprev;
struct delete_thread_of_inferior_arg arg;
infprev = NULL;
for (inf = inferior_list; inf; infprev = inf, inf = inf->next)
if (inf == todel)
break;
if (!inf)
return;
arg.pid = inf->pid;
arg.silent = silent;
iterate_over_threads (delete_thread_of_inferior, &arg);
if (infprev)
infprev->next = inf->next;
else
inferior_list = inf->next;
free_inferior (inf);
}
void
delete_inferior (int pid)
{
struct inferior *inf = find_inferior_pid (pid);
delete_inferior_1 (inf, 0);
if (print_inferior_events)
printf_unfiltered (_("[Inferior %d exited]\n"), pid);
}
void
delete_inferior_silent (int pid)
{
struct inferior *inf = find_inferior_pid (pid);
delete_inferior_1 (inf, 1);
}
/* If SILENT then be quiet -- don't announce a inferior exit, or the
exit of its threads. */
static void
exit_inferior_1 (struct inferior *inftoex, int silent)
{
struct inferior *inf;
struct delete_thread_of_inferior_arg arg;
for (inf = inferior_list; inf; inf = inf->next)
if (inf == inftoex)
break;
if (!inf)
return;
arg.pid = inf->pid;
arg.silent = silent;
iterate_over_threads (delete_thread_of_inferior, &arg);
/* Notify the observers before removing the inferior from the list,
so that the observers have a chance to look it up. */
observer_notify_inferior_exit (inf->pid);
inf->pid = 0;
if (inf->vfork_parent != NULL)
{
inf->vfork_parent->vfork_child = NULL;
inf->vfork_parent = NULL;
}
}
void
exit_inferior (int pid)
{
struct inferior *inf = find_inferior_pid (pid);
exit_inferior_1 (inf, 0);
if (print_inferior_events)
printf_unfiltered (_("[Inferior %d exited]\n"), pid);
}
void
exit_inferior_silent (int pid)
{
struct inferior *inf = find_inferior_pid (pid);
exit_inferior_1 (inf, 1);
}
void
exit_inferior_num_silent (int num)
{
struct inferior *inf = find_inferior_id (num);
exit_inferior_1 (inf, 1);
}
void
detach_inferior (int pid)
{
struct inferior *inf = find_inferior_pid (pid);
exit_inferior_1 (inf, 1);
if (print_inferior_events)
printf_unfiltered (_("[Inferior %d detached]\n"), pid);
}
void
inferior_appeared (struct inferior *inf, int pid)
{
inf->pid = pid;
observer_notify_inferior_appeared (pid);
}
void
discard_all_inferiors (void)
{
struct inferior *inf;
for (inf = inferior_list; inf; inf = inf->next)
{
if (inf->pid != 0)
exit_inferior_silent (inf->pid);
}
}
struct inferior *
find_inferior_id (int num)
{
struct inferior *inf;
for (inf = inferior_list; inf; inf = inf->next)
if (inf->num == num)
return inf;
return NULL;
}
struct inferior *
find_inferior_pid (int pid)
{
struct inferior *inf;
/* Looking for inferior pid == 0 is always wrong, and indicative of
a bug somewhere else. There may be more than one with pid == 0,
for instance. */
gdb_assert (pid != 0);
for (inf = inferior_list; inf; inf = inf->next)
if (inf->pid == pid)
return inf;
return NULL;
}
/* Find an inferior bound to PSPACE. */
struct inferior *
find_inferior_for_program_space (struct program_space *pspace)
{
struct inferior *inf;
for (inf = inferior_list; inf != NULL; inf = inf->next)
{
if (inf->pspace == pspace)
return inf;
}
return NULL;
}
struct inferior *
iterate_over_inferiors (int (*callback) (struct inferior *, void *),
void *data)
{
struct inferior *inf, *infnext;
for (inf = inferior_list; inf; inf = infnext)
{
infnext = inf->next;
if ((*callback) (inf, data))
return inf;
}
return NULL;
}
int
valid_gdb_inferior_id (int num)
{
struct inferior *inf;
for (inf = inferior_list; inf; inf = inf->next)
if (inf->num == num)
return 1;
return 0;
}
int
pid_to_gdb_inferior_id (int pid)
{
struct inferior *inf;
for (inf = inferior_list; inf; inf = inf->next)
if (inf->pid == pid)
return inf->num;
return 0;
}
int
gdb_inferior_id_to_pid (int num)
{
struct inferior *inferior = find_inferior_id (num);
if (inferior)
return inferior->pid;
else
return -1;
}
int
in_inferior_list (int pid)
{
struct inferior *inf;
for (inf = inferior_list; inf; inf = inf->next)
if (inf->pid == pid)
return 1;
return 0;
}
int
have_inferiors (void)
{
struct inferior *inf;
for (inf = inferior_list; inf; inf = inf->next)
if (inf->pid != 0)
return 1;
return 0;
}
int
have_live_inferiors (void)
{
struct target_ops *t;
/* The check on stratum suffices, as GDB doesn't currently support
multiple target interfaces. */
if (have_inferiors ())
for (t = current_target.beneath; t != NULL; t = t->beneath)
if (t->to_stratum == process_stratum)
return 1;
return 0;
}
/* Prune away automatically added program spaces that aren't required
anymore. */
void
prune_inferiors (void)
{
struct inferior *ss, **ss_link;
struct inferior *current = current_inferior ();
ss = inferior_list;
ss_link = &inferior_list;
while (ss)
{
if (ss == current
|| !ss->removable
|| ss->pid != 0)
{
ss_link = &ss->next;
ss = *ss_link;
continue;
}
*ss_link = ss->next;
delete_inferior_1 (ss, 1);
ss = *ss_link;
}
prune_program_spaces ();
}
/* Simply returns the count of inferiors. */
int
number_of_inferiors (void)
{
struct inferior *inf;
int count = 0;
for (inf = inferior_list; inf != NULL; inf = inf->next)
count++;
return count;
}
/* Prints the list of inferiors and their details on UIOUT. This is a
version of 'info_inferior_command' suitable for use from MI.
If REQUESTED_INFERIOR is not -1, it's the GDB id of the inferior that
should be printed. Otherwise, all inferiors are printed. */
void
print_inferior (struct ui_out *uiout, int requested_inferior)
{
struct inferior *inf;
struct cleanup *old_chain;
int inf_count = 0;
/* Compute number of inferiors we will print. */
for (inf = inferior_list; inf; inf = inf->next)
{
struct cleanup *chain2;
if (requested_inferior != -1 && inf->num != requested_inferior)
continue;
++inf_count;
}
if (inf_count == 0)
{
ui_out_message (uiout, 0, "No inferiors.\n");
return;
}
old_chain = make_cleanup_ui_out_table_begin_end (uiout, 4, inf_count,
"inferiors");
ui_out_table_header (uiout, 1, ui_left, "current", "");
ui_out_table_header (uiout, 4, ui_left, "number", "Num");
ui_out_table_header (uiout, 17, ui_left, "target-id", "Description");
ui_out_table_header (uiout, 17, ui_left, "exec", "Executable");
ui_out_table_body (uiout);
for (inf = inferior_list; inf; inf = inf->next)
{
struct cleanup *chain2;
if (requested_inferior != -1 && inf->num != requested_inferior)
continue;
chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
if (inf == current_inferior ())
ui_out_field_string (uiout, "current", "*");
else
ui_out_field_skip (uiout, "current");
ui_out_field_int (uiout, "number", inf->num);
if (inf->pid)
ui_out_field_string (uiout, "target-id",
target_pid_to_str (pid_to_ptid (inf->pid)));
else
ui_out_field_string (uiout, "target-id", "<null>");
if (inf->pspace->ebfd)
ui_out_field_string (uiout, "exec",
bfd_get_filename (inf->pspace->ebfd));
else
ui_out_field_skip (uiout, "exec");
/* Print extra info that isn't really fit to always present in
tabular form. Currently we print the vfork parent/child
relationships, if any. */
if (inf->vfork_parent)
{
ui_out_text (uiout, _("\n\tis vfork child of inferior "));
ui_out_field_int (uiout, "vfork-parent", inf->vfork_parent->num);
}
if (inf->vfork_child)
{
ui_out_text (uiout, _("\n\tis vfork parent of inferior "));
ui_out_field_int (uiout, "vfork-child", inf->vfork_child->num);
}
ui_out_text (uiout, "\n");
do_cleanups (chain2);
}
do_cleanups (old_chain);
}
static void
detach_inferior_command (char *args, int from_tty)
{
int num, pid;
struct thread_info *tp;
if (!args || !*args)
error (_("Requires argument (inferior id to detach)"));
num = parse_and_eval_long (args);
if (!valid_gdb_inferior_id (num))
error (_("Inferior ID %d not known."), num);
pid = gdb_inferior_id_to_pid (num);
tp = any_thread_of_process (pid);
if (!tp)
error (_("Inferior has no threads."));
switch_to_thread (tp->ptid);
detach_command (NULL, from_tty);
}
static void
kill_inferior_command (char *args, int from_tty)
{
int num, pid;
struct thread_info *tp;
if (!args || !*args)
error (_("Requires argument (inferior id to kill)"));
num = parse_and_eval_long (args);
if (!valid_gdb_inferior_id (num))
error (_("Inferior ID %d not known."), num);
pid = gdb_inferior_id_to_pid (num);
tp = any_thread_of_process (pid);
if (!tp)
error (_("Inferior has no threads."));
switch_to_thread (tp->ptid);
target_kill ();
bfd_cache_close_all ();
}
static void
inferior_command (char *args, int from_tty)
{
struct inferior *inf;
int num;
num = parse_and_eval_long (args);
inf = find_inferior_id (num);
if (inf == NULL)
error (_("Inferior ID %d not known."), num);
printf_filtered (_("[Switching to inferior %d [%s] (%s)]\n"),
inf->num,
target_pid_to_str (pid_to_ptid (inf->pid)),
(inf->pspace->ebfd
? bfd_get_filename (inf->pspace->ebfd)
: _("<noexec>")));
if (inf->pid != 0)
{
if (inf->pid != ptid_get_pid (inferior_ptid))
{
struct thread_info *tp;
tp = any_thread_of_process (inf->pid);
if (!tp)
error (_("Inferior has no threads."));
switch_to_thread (tp->ptid);
}
printf_filtered (_("[Switching to thread %d (%s)] "),
pid_to_thread_id (inferior_ptid),
target_pid_to_str (inferior_ptid));
}
else
{
struct inferior *inf;
inf = find_inferior_id (num);
set_current_inferior (inf);
switch_to_thread (null_ptid);
set_current_program_space (inf->pspace);
}
if (inf->pid != 0 && is_running (inferior_ptid))
ui_out_text (uiout, "(running)\n");
else if (inf->pid != 0)
{
ui_out_text (uiout, "\n");
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
}
}
/* Print information about currently known inferiors. */
static void
info_inferiors_command (char *args, int from_tty)
{
int requested = -1;
if (args && *args)
{
requested = parse_and_eval_long (args);
if (!valid_gdb_inferior_id (requested))
error (_("Inferior ID %d not known."), requested);
}
print_inferior (uiout, requested);
}
/* remove-inferior ID */
void
remove_inferior_command (char *args, int from_tty)
{
int num;
struct inferior *inf;
num = parse_and_eval_long (args);
inf = find_inferior_id (num);
if (inf == NULL)
error (_("Inferior ID %d not known."), num);
if (inf == current_inferior ())
error (_("Can not remove current symbol inferior."));
delete_inferior_1 (inf, 1);
}
/* add-inferior [-copies N] [-exec FILENAME] */
void
add_inferior_command (char *args, int from_tty)
{
int i, copies = 1;
char *exec = NULL;
char **argv;
struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
if (args)
{
argv = gdb_buildargv (args);
make_cleanup_freeargv (argv);
for (; *argv != NULL; argv++)
{
if (**argv == '-')
{
if (strcmp (*argv, "-copies") == 0)
{
++argv;
if (!*argv)
error (_("No argument to -copies"));
copies = parse_and_eval_long (*argv);
}
else if (strcmp (*argv, "-exec") == 0)
{
++argv;
if (!*argv)
error (_("No argument to -exec"));
exec = *argv;
}
}
else
error (_("Invalid argument"));
}
}
save_current_space_and_thread ();
for (i = 0; i < copies; ++i)
{
struct address_space *aspace;
struct program_space *pspace;
struct inferior *inf;
/* If all inferiors share an address space on this system, this
doesn't really return a new address space; otherwise, it
really does. */
aspace = maybe_new_address_space ();
pspace = add_program_space (aspace);
inf = add_inferior (0);
inf->pspace = pspace;
inf->aspace = pspace->aspace;
printf_filtered (_("Added inferior %d\n"), inf->num);
if (exec != NULL)
{
/* Switch over temporarily, while reading executable and
symbols.q */
set_current_program_space (pspace);
set_current_inferior (inf);
switch_to_thread (null_ptid);
exec_file_attach (exec, from_tty);
symbol_file_add_main (exec, from_tty);
}
}
do_cleanups (old_chain);
}
/* clone-inferior [-copies N] [ID] */
void
clone_inferior_command (char *args, int from_tty)
{
int i, copies = 1;
char **argv;
struct inferior *orginf = NULL;
struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
if (args)
{
argv = gdb_buildargv (args);
make_cleanup_freeargv (argv);
for (; *argv != NULL; argv++)
{
if (**argv == '-')
{
if (strcmp (*argv, "-copies") == 0)
{
++argv;
if (!*argv)
error (_("No argument to -copies"));
copies = parse_and_eval_long (*argv);
if (copies < 0)
error (_("Invalid copies number"));
}
}
else
{
if (orginf == NULL)
{
int num;
/* The first non-option (-) argument specified the
program space ID. */
num = parse_and_eval_long (*argv);
orginf = find_inferior_id (num);
if (orginf == NULL)
error (_("Inferior ID %d not known."), num);
continue;
}
else
error (_("Invalid argument"));
}
}
}
/* If no inferior id was specified, then the user wants to clone the
current inferior. */
if (orginf == NULL)
orginf = current_inferior ();
save_current_space_and_thread ();
for (i = 0; i < copies; ++i)
{
struct address_space *aspace;
struct program_space *pspace;
struct inferior *inf;
/* If all inferiors share an address space on this system, this
doesn't really return a new address space; otherwise, it
really does. */
aspace = maybe_new_address_space ();
pspace = add_program_space (aspace);
inf = add_inferior (0);
inf->pspace = pspace;
inf->aspace = pspace->aspace;
printf_filtered (_("Added inferior %d.\n"), inf->num);
set_current_inferior (inf);
switch_to_thread (null_ptid);
clone_program_space (pspace, orginf->pspace);
}
do_cleanups (old_chain);
}
/* Print notices when new inferiors are created and die. */
static void
show_print_inferior_events (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Printing of inferior events is %s.\n"), value);
}
/* Keep a registry of per-inferior data-pointers required by other GDB
modules. */
struct inferior_data
{
unsigned index;
void (*cleanup) (struct inferior *, void *);
};
struct inferior_data_registration
{
struct inferior_data *data;
struct inferior_data_registration *next;
};
struct inferior_data_registry
{
struct inferior_data_registration *registrations;
unsigned num_registrations;
};
static struct inferior_data_registry inferior_data_registry
= { NULL, 0 };
const struct inferior_data *
register_inferior_data_with_cleanup
(void (*cleanup) (struct inferior *, void *))
{
struct inferior_data_registration **curr;
/* Append new registration. */
for (curr = &inferior_data_registry.registrations;
*curr != NULL; curr = &(*curr)->next);
*curr = XMALLOC (struct inferior_data_registration);
(*curr)->next = NULL;
(*curr)->data = XMALLOC (struct inferior_data);
(*curr)->data->index = inferior_data_registry.num_registrations++;
(*curr)->data->cleanup = cleanup;
return (*curr)->data;
}
const struct inferior_data *
register_inferior_data (void)
{
return register_inferior_data_with_cleanup (NULL);
}
static void
inferior_alloc_data (struct inferior *inf)
{
gdb_assert (inf->data == NULL);
inf->num_data = inferior_data_registry.num_registrations;
inf->data = XCALLOC (inf->num_data, void *);
}
static void
inferior_free_data (struct inferior *inf)
{
gdb_assert (inf->data != NULL);
clear_inferior_data (inf);
xfree (inf->data);
inf->data = NULL;
}
void
clear_inferior_data (struct inferior *inf)
{
struct inferior_data_registration *registration;
int i;
gdb_assert (inf->data != NULL);
for (registration = inferior_data_registry.registrations, i = 0;
i < inf->num_data;
registration = registration->next, i++)
if (inf->data[i] != NULL && registration->data->cleanup)
registration->data->cleanup (inf, inf->data[i]);
memset (inf->data, 0, inf->num_data * sizeof (void *));
}
void
set_inferior_data (struct inferior *inf,
const struct inferior_data *data,
void *value)
{
gdb_assert (data->index < inf->num_data);
inf->data[data->index] = value;
}
void *
inferior_data (struct inferior *inf, const struct inferior_data *data)
{
gdb_assert (data->index < inf->num_data);
return inf->data[data->index];
}
void
initialize_inferiors (void)
{
/* There's always one inferior. Note that this function isn't an
automatic _initialize_foo function, since other _initialize_foo
routines may need to install their per-inferior data keys. We
can only allocate an inferior when all those modules have done
that. Do this after initialize_progspace, due to the
current_program_space reference. */
current_inferior_ = add_inferior (0);
current_inferior_->pspace = current_program_space;
current_inferior_->aspace = current_program_space->aspace;
add_info ("inferiors", info_inferiors_command,
_("IDs of currently known inferiors."));
add_com ("add-inferior", no_class, add_inferior_command, _("\
Add a new inferior.\n\
Usage: add-inferior [-copies <N>] [-exec <FILENAME>]\n\
N is the optional number of inferior to add, default is 1.\n\
FILENAME is the file name of the executable to use\n\
as main program."));
add_com ("remove-inferior", no_class, remove_inferior_command, _("\
Remove inferior ID.\n\
Usage: remove-inferior ID"));
add_com ("clone-inferior", no_class, clone_inferior_command, _("\
Clone inferior ID.\n\
Usage: clone-inferior [-copies <N>] [ID]\n\
Add N copies of inferior ID. The new inferior has the same\n\
executable loaded as the copied inferior. If -copies is not specified,\n\
adds 1 copy. If ID is not specified, it is the current inferior\n\
that is cloned."));
add_cmd ("inferior", class_run, detach_inferior_command, _("\
Detach from inferior ID."),
&detachlist);
add_cmd ("inferior", class_run, kill_inferior_command, _("\
Kill inferior ID."),
&killlist);
add_cmd ("inferior", class_run, inferior_command, _("\
Use this command to switch between inferiors.\n\
The new inferior ID must be currently known."),
&cmdlist);
add_setshow_boolean_cmd ("inferior-events", no_class,
&print_inferior_events, _("\
Set printing of inferior events (e.g., inferior start and exit)."), _("\
Show printing of inferior events (e.g., inferior start and exit)."), NULL,
NULL,
show_print_inferior_events,
&setprintlist, &showprintlist);
}