X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Finferior.c;h=32b6db242cd8b6066713ebe04ea6731180e9a788;hb=112e8700a6fd2fed65ca70132c9cbed4132e8bd4;hp=ebe13bf51310fcf293b45b343e6074bbfce4c600;hpb=c82c0b55e7f5182e3822f3878b9bc67a241d4f21;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/inferior.c b/gdb/inferior.c
index ebe13bf513..32b6db242c 100644
--- a/gdb/inferior.c
+++ b/gdb/inferior.c
@@ -1,6 +1,6 @@
 /* Multi-process control for GDB, the GNU debugger.
 
-   Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+   Copyright (C) 2008-2016 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -22,20 +22,26 @@
 #include "inferior.h"
 #include "target.h"
 #include "command.h"
+#include "completer.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"
 #include "cli/cli-utils.h"
+#include "continuations.h"
+#include "arch-utils.h"
+#include "target-descriptions.h"
+#include "readline/tilde.h"
 
 void _initialize_inferiors (void);
 
-static void inferior_alloc_data (struct inferior *inf);
-static void inferior_free_data (struct inferior *inf);
+/* Keep a registry of per-inferior data-pointers required by other GDB
+   modules.  */
+
+DEFINE_REGISTRY (inferior, REGISTRY_ACCESS_FIELD)
 
 struct inferior *inferior_list = NULL;
 static int highest_inferior_num;
@@ -68,7 +74,7 @@ set_current_inferior (struct inferior *inf)
 static void
 restore_inferior (void *arg)
 {
-  struct inferior *saved_inferior = arg;
+  struct inferior *saved_inferior = (struct inferior *) arg;
 
   set_current_inferior (saved_inferior);
 }
@@ -94,7 +100,8 @@ free_inferior (struct inferior *inf)
   xfree (inf->args);
   xfree (inf->terminal);
   free_environ (inf->environment);
-  xfree (inf->private);
+  target_desc_info_free (inf->tdesc_info);
+  xfree (inf->priv);
   xfree (inf);
 }
 
@@ -121,15 +128,24 @@ add_inferior_silent (int pid)
 {
   struct inferior *inf;
 
-  inf = xmalloc (sizeof (*inf));
+  inf = XNEW (struct inferior);
   memset (inf, 0, sizeof (*inf));
   inf->pid = pid;
 
   inf->control.stop_soon = NO_STOP_QUIETLY;
 
   inf->num = ++highest_inferior_num;
-  inf->next = inferior_list;
-  inferior_list = inf;
+
+  if (inferior_list == NULL)
+    inferior_list = inf;
+  else
+    {
+      struct inferior *last;
+
+      for (last = inferior_list; last->next != NULL; last = last->next)
+	;
+      last->next = inf;
+    }
 
   inf->environment = make_environ ();
   init_environ (inf->environment);
@@ -164,7 +180,8 @@ struct delete_thread_of_inferior_arg
 static int
 delete_thread_of_inferior (struct thread_info *tp, void *data)
 {
-  struct delete_thread_of_inferior_arg *arg = data;
+  struct delete_thread_of_inferior_arg *arg
+    = (struct delete_thread_of_inferior_arg *) data;
 
   if (ptid_get_pid (tp->ptid) == arg->pid)
     {
@@ -178,29 +195,7 @@ delete_thread_of_inferior (struct thread_info *tp, void *data)
 }
 
 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.  */
-
-void
-delete_inferior_1 (struct inferior *todel, int silent)
+delete_inferior (struct inferior *todel)
 {
   struct inferior *inf, *infprev;
   struct delete_thread_of_inferior_arg arg;
@@ -215,7 +210,7 @@ delete_inferior_1 (struct inferior *todel, int silent)
     return;
 
   arg.pid = inf->pid;
-  arg.silent = silent;
+  arg.silent = 1;
 
   iterate_over_threads (delete_thread_of_inferior, &arg);
 
@@ -226,29 +221,13 @@ delete_inferior_1 (struct inferior *todel, int silent)
 
   observer_notify_inferior_removed (inf);
 
-  free_inferior (inf);
-}
-
-void
-delete_inferior (int pid)
-{
-  struct inferior *inf = find_inferior_pid (pid);
+  /* If this program space is rendered useless, remove it. */
+  if (program_space_empty_p (inf->pspace))
+    delete_program_space (inf->pspace);
 
-  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);
+  free_inferior (inf);
 }
 
-
 /* If SILENT then be quiet -- don't announce a inferior exit, or the
    exit of its threads.  */
 
@@ -270,16 +249,25 @@ exit_inferior_1 (struct inferior *inftoex, int 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);
 
   inf->pid = 0;
+  inf->fake_pid_p = 0;
+  xfree (inf->priv);
+  inf->priv = NULL;
+
   if (inf->vfork_parent != NULL)
     {
       inf->vfork_parent->vfork_child = NULL;
       inf->vfork_parent = NULL;
     }
+  if (inf->vfork_child != NULL)
+    {
+      inf->vfork_child->vfork_parent = NULL;
+      inf->vfork_child = NULL;
+    }
+
+  inf->pending_detach = 0;
 }
 
 void
@@ -314,7 +302,7 @@ detach_inferior (int pid)
 {
   struct inferior *inf = find_inferior_pid (pid);
 
-  exit_inferior_1 (inf, 1);
+  exit_inferior_1 (inf, 0);
 
   if (print_inferior_events)
     printf_unfiltered (_("[Inferior %d detached]\n"), pid);
@@ -324,6 +312,8 @@ void
 inferior_appeared (struct inferior *inf, int pid)
 {
   inf->pid = pid;
+  inf->has_exit_code = 0;
+  inf->exit_code = 0;
 
   observer_notify_inferior_appeared (inf);
 }
@@ -369,12 +359,23 @@ find_inferior_pid (int pid)
   return NULL;
 }
 
-/* Find an inferior bound to PSPACE.  */
+/* See inferior.h */
+
+struct inferior *
+find_inferior_ptid (ptid_t ptid)
+{
+  return find_inferior_pid (ptid_get_pid (ptid));
+}
+
+/* See inferior.h.  */
 
 struct inferior *
 find_inferior_for_program_space (struct program_space *pspace)
 {
-  struct inferior *inf;
+  struct inferior *inf = current_inferior ();
+
+  if (inf->pspace == pspace)
+    return inf;
 
   for (inf = inferior_list; inf != NULL; inf = inf->next)
     {
@@ -459,36 +460,45 @@ have_inferiors (void)
   return 0;
 }
 
+/* Return the number of live inferiors.  We account for the case
+   where an inferior might have a non-zero pid but no threads, as
+   in the middle of a 'mourn' operation.  */
+
 int
-have_live_inferiors (void)
+number_of_live_inferiors (void)
 {
-  struct cleanup *old_chain;
   struct inferior *inf;
-
-  old_chain = make_cleanup_restore_current_thread ();
+  int num_inf = 0;
 
   for (inf = inferior_list; inf; inf = inf->next)
     if (inf->pid != 0)
       {
 	struct thread_info *tp;
-	
-	tp = any_thread_of_process (inf->pid);
-	if (tp)
-	  {
-	    switch_to_thread (tp->ptid);
-
-	    if (target_has_execution)
-	      break;
-	  }
+
+	ALL_NON_EXITED_THREADS (tp)
+	 if (tp && ptid_get_pid (tp->ptid) == inf->pid)
+	   if (target_has_execution_1 (tp->ptid))
+	     {
+	       /* Found a live thread in this inferior, go to the next
+		  inferior.  */
+	       ++num_inf;
+	       break;
+	     }
       }
 
-  do_cleanups (old_chain);
+  return num_inf;
+}
+
+/* Return true if there is at least one live inferior.  */
 
-  return inf != NULL;
+int
+have_live_inferiors (void)
+{
+  return number_of_live_inferiors () > 0;
 }
 
-/* Prune away automatically added program spaces that aren't required
-   anymore.  */
+/* Prune away any unused inferiors, and then prune away no longer used
+   program spaces.  */
 
 void
 prune_inferiors (void)
@@ -510,11 +520,9 @@ prune_inferiors (void)
 	}
 
       *ss_link = ss->next;
-      delete_inferior_1 (ss, 1);
+      delete_inferior (ss);
       ss = *ss_link;
     }
-
-  prune_program_spaces ();
 }
 
 /* Simply returns the count of inferiors.  */
@@ -531,6 +539,33 @@ number_of_inferiors (void)
   return count;
 }
 
+/* Converts an inferior process id to a string.  Like
+   target_pid_to_str, but special cases the null process.  */
+
+static char *
+inferior_pid_to_str (int pid)
+{
+  if (pid != 0)
+    return target_pid_to_str (pid_to_ptid (pid));
+  else
+    return _("<null>");
+}
+
+/* See inferior.h.  */
+
+void
+print_selected_inferior (struct ui_out *uiout)
+{
+  struct inferior *inf = current_inferior ();
+  const char *filename = inf->pspace->pspace_exec_filename;
+
+  if (filename == NULL)
+    filename = _("<noexec>");
+
+  uiout->message (_("[Switching to inferior %d [%s] (%s)]\n"),
+		  inf->num, inferior_pid_to_str (inf->pid), filename);
+}
+
 /* Prints the list of inferiors and their details on UIOUT.  This is a
    version of 'info_inferior_command' suitable for use from MI.
 
@@ -556,18 +591,18 @@ print_inferior (struct ui_out *uiout, char *requested_inferiors)
 
   if (inf_count == 0)
     {
-      ui_out_message (uiout, 0, "No inferiors.\n");
+      uiout->message ("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");
+  uiout->table_header (1, ui_left, "current", "");
+  uiout->table_header (4, ui_left, "number", "Num");
+  uiout->table_header (17, ui_left, "target-id", "Description");
+  uiout->table_header (17, ui_left, "exec", "Executable");
 
-  ui_out_table_body (uiout);
+  uiout->table_body ();
   for (inf = inferior_list; inf; inf = inf->next)
     {
       struct cleanup *chain2;
@@ -578,39 +613,34 @@ print_inferior (struct ui_out *uiout, char *requested_inferiors)
       chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 
       if (inf == current_inferior ())
-	ui_out_field_string (uiout, "current", "*");
+	uiout->field_string ("current", "*");
       else
-	ui_out_field_skip (uiout, "current");
+	uiout->field_skip ("current");
 
-      ui_out_field_int (uiout, "number", inf->num);
+      uiout->field_int ("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>");
+      uiout->field_string ("target-id", inferior_pid_to_str (inf->pid));
 
-      if (inf->pspace->ebfd)
-	ui_out_field_string (uiout, "exec",
-			     bfd_get_filename (inf->pspace->ebfd));
+      if (inf->pspace->pspace_exec_filename != NULL)
+	uiout->field_string ("exec", inf->pspace->pspace_exec_filename);
       else
-	ui_out_field_skip (uiout, "exec");
+	uiout->field_skip ("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);
+	  uiout->text (_("\n\tis vfork child of inferior "));
+	  uiout->field_int ("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);
+	  uiout->text (_("\n\tis vfork parent of inferior "));
+	  uiout->field_int ("vfork-child", inf->vfork_child->num);
 	}
 
-      ui_out_text (uiout, "\n");
+      uiout->text ("\n");
       do_cleanups (chain2);
     }
 
@@ -620,51 +650,79 @@ print_inferior (struct ui_out *uiout, char *requested_inferiors)
 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)"));
+    error (_("Requires argument (inferior id(s) to detach)"));
 
-  num = parse_and_eval_long (args);
+  number_or_range_parser parser (args);
+  while (!parser.finished ())
+    {
+      int num = parser.get_number ();
 
-  if (!valid_gdb_inferior_id (num))
-    error (_("Inferior ID %d not known."), num);
+      if (!valid_gdb_inferior_id (num))
+	{
+	  warning (_("Inferior ID %d not known."), num);
+	  continue;
+	}
 
-  pid = gdb_inferior_id_to_pid (num);
+      int pid = gdb_inferior_id_to_pid (num);
+      if (pid == 0)
+	{
+	  warning (_("Inferior ID %d is not running."), num);
+	  continue;
+	}
 
-  tp = any_thread_of_process (pid);
-  if (!tp)
-    error (_("Inferior has no threads."));
+      tp = any_thread_of_process (pid);
+      if (!tp)
+	{
+	  warning (_("Inferior ID %d has no threads."), num);
+	  continue;
+	}
 
-  switch_to_thread (tp->ptid);
+      switch_to_thread (tp->ptid);
 
-  detach_command (NULL, from_tty);
+      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)"));
+    error (_("Requires argument (inferior id(s) to kill)"));
 
-  num = parse_and_eval_long (args);
+  number_or_range_parser parser (args);
+  while (!parser.finished ())
+    {
+      int num = parser.get_number ();
 
-  if (!valid_gdb_inferior_id (num))
-    error (_("Inferior ID %d not known."), num);
+      if (!valid_gdb_inferior_id (num))
+	{
+	  warning (_("Inferior ID %d not known."), num);
+	  continue;
+	}
 
-  pid = gdb_inferior_id_to_pid (num);
+      int pid = gdb_inferior_id_to_pid (num);
+      if (pid == 0)
+	{
+	  warning (_("Inferior ID %d is not running."), num);
+	  continue;
+	}
 
-  tp = any_thread_of_process (pid);
-  if (!tp)
-    error (_("Inferior has no threads."));
+      tp = any_thread_of_process (pid);
+      if (!tp)
+	{
+	  warning (_("Inferior ID %d has no threads."), num);
+	  continue;
+	}
 
-  switch_to_thread (tp->ptid);
+      switch_to_thread (tp->ptid);
 
-  target_kill ();
+      target_kill ();
+    }
 
   bfd_cache_close_all ();
 }
@@ -681,13 +739,6 @@ inferior_command (char *args, int from_tty)
   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))
@@ -701,26 +752,18 @@ inferior_command (char *args, int from_tty)
 	  switch_to_thread (tp->ptid);
 	}
 
-      printf_filtered (_("[Switching to thread %d (%s)] "),
-		       pid_to_thread_id (inferior_ptid),
-		       target_pid_to_str (inferior_ptid));
+      observer_notify_user_selected_context_changed
+	(USER_SELECTED_INFERIOR
+	 | USER_SELECTED_THREAD
+	 | USER_SELECTED_FRAME);
     }
   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);
+      observer_notify_user_selected_context_changed (USER_SELECTED_INFERIOR);
     }
 }
 
@@ -729,30 +772,43 @@ inferior_command (char *args, int from_tty)
 static void
 info_inferiors_command (char *args, int from_tty)
 {
-  print_inferior (uiout, args);
+  print_inferior (current_uiout, args);
 }
 
 /* remove-inferior ID */
 
-void
+static void
 remove_inferior_command (char *args, int from_tty)
 {
-  int num;
-  struct inferior *inf;
+  if (args == NULL || *args == '\0')
+    error (_("Requires an argument (inferior id(s) to remove)"));
 
-  num = parse_and_eval_long (args);
-  inf = find_inferior_id (num);
+  number_or_range_parser parser (args);
+  while (!parser.finished ())
+    {
+      int num = parser.get_number ();
+      struct inferior *inf = find_inferior_id (num);
 
-  if (inf == NULL)
-    error (_("Inferior ID %d not known."), num);
+      if (inf == NULL)
+	{
+	  warning (_("Inferior ID %d not known."), num);
+	  continue;
+	}
 
-  if (inf == current_inferior ())
-    error (_("Can not remove current symbol inferior."));
+      if (inf == current_inferior ())
+	{
+	  warning (_("Can not remove current inferior %d."), num);
+	  continue;
+	}
     
-  if (inf->pid != 0)
-    error (_("Can not remove an active inferior."));
+      if (inf->pid != 0)
+	{
+	  warning (_("Can not remove active inferior %d."), num);
+	  continue;
+	}
 
-  delete_inferior_1 (inf, 1);
+      delete_inferior (inf);
+    }
 }
 
 struct inferior *
@@ -761,6 +817,7 @@ add_inferior_with_spaces (void)
   struct address_space *aspace;
   struct program_space *pspace;
   struct inferior *inf;
+  struct gdbarch_info info;
 
   /* If all inferiors share an address space on this system, this
      doesn't really return a new address space; otherwise, it
@@ -771,19 +828,31 @@ add_inferior_with_spaces (void)
   inf->pspace = pspace;
   inf->aspace = pspace->aspace;
 
+  /* Setup the inferior's initial arch, based on information obtained
+     from the global "set ..." options.  */
+  gdbarch_info_init (&info);
+  inf->gdbarch = gdbarch_find_by_info (info);
+  /* The "set ..." options reject invalid settings, so we should
+     always have a valid arch by now.  */
+  gdb_assert (inf->gdbarch != NULL);
+
   return inf;
 }
 
 /* add-inferior [-copies N] [-exec FILENAME]  */
 
-void
+static void
 add_inferior_command (char *args, int from_tty)
 {
   int i, copies = 1;
   char *exec = NULL;
   char **argv;
+  symfile_add_flags add_flags = 0;
   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
 
+  if (from_tty)
+    add_flags |= SYMFILE_VERBOSE;
+
   if (args)
     {
       argv = gdb_buildargv (args);
@@ -805,7 +874,8 @@ add_inferior_command (char *args, int from_tty)
 		  ++argv;
 		  if (!*argv)
 		    error (_("No argument to -exec"));
-		  exec = *argv;
+		  exec = tilde_expand (*argv);
+		  make_cleanup (xfree, exec);
 		}
 	    }
 	  else
@@ -830,7 +900,7 @@ add_inferior_command (char *args, int from_tty)
 	  switch_to_thread (null_ptid);
 
 	  exec_file_attach (exec, from_tty);
-	  symbol_file_add_main (exec, from_tty);
+	  symbol_file_add_main (exec, add_flags);
 	}
     }
 
@@ -839,7 +909,7 @@ add_inferior_command (char *args, int from_tty)
 
 /* clone-inferior [-copies N] [ID] */
 
-void
+static void
 clone_inferior_command (char *args, int from_tty)
 {
   int i, copies = 1;
@@ -909,6 +979,12 @@ clone_inferior_command (char *args, int from_tty)
       inf = add_inferior (0);
       inf->pspace = pspace;
       inf->aspace = pspace->aspace;
+      inf->gdbarch = orginf->gdbarch;
+
+      /* If the original inferior had a user specified target
+	 description, make the clone use it too.  */
+      if (target_desc_info_from_user_p (inf->tdesc_info))
+	copy_inferior_target_desc_info (inf, orginf);
 
       printf_filtered (_("Added inferior %d.\n"), inf->num);
 
@@ -928,110 +1004,33 @@ show_print_inferior_events (struct ui_file *file, int from_tty,
   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);
-}
+/* Return a new value for the selected inferior's id.  */
 
-static void
-inferior_alloc_data (struct inferior *inf)
+static struct value *
+inferior_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
+			void *ignore)
 {
-  gdb_assert (inf->data == NULL);
-  inf->num_data = inferior_data_registry.num_registrations;
-  inf->data = XCALLOC (inf->num_data, void *);
-}
+  struct inferior *inf = current_inferior ();
 
-static void
-inferior_free_data (struct inferior *inf)
-{
-  gdb_assert (inf->data != NULL);
-  clear_inferior_data (inf);
-  xfree (inf->data);
-  inf->data = NULL;
+  return value_from_longest (builtin_type (gdbarch)->builtin_int, inf->num);
 }
 
-void
-clear_inferior_data (struct inferior *inf)
-{
-  struct inferior_data_registration *registration;
-  int i;
+/* Implementation of `$_inferior' variable.  */
 
-  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)
+static const struct internalvar_funcs inferior_funcs =
 {
-  gdb_assert (data->index < inf->num_data);
-  inf->data[data->index] = value;
-}
+  inferior_id_make_value,
+  NULL,
+  NULL
+};
 
-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)
 {
+  struct cmd_list_element *c = NULL;
+
   /* 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
@@ -1041,20 +1040,23 @@ initialize_inferiors (void)
   current_inferior_ = add_inferior (0);
   current_inferior_->pspace = current_program_space;
   current_inferior_->aspace = current_program_space->aspace;
+  /* The architecture will be initialized shortly, by
+     initialize_current_architecture.  */
 
   add_info ("inferiors", info_inferiors_command, 
 	    _("IDs of specified inferiors (all inferiors if no argument)."));
 
-  add_com ("add-inferior", no_class, add_inferior_command, _("\
+  c = 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\
+N is the optional number of inferiors to add, default is 1.\n\
 FILENAME is the file name of the executable to use\n\
 as main program."));
+  set_cmd_completer (c, filename_completer);
 
-  add_com ("remove-inferior", no_class, remove_inferior_command, _("\
-Remove inferior ID.\n\
-Usage: remove-inferior ID"));
+  add_com ("remove-inferiors", no_class, remove_inferior_command, _("\
+Remove inferior ID (or list of IDs).\n\
+Usage: remove-inferiors ID..."));
 
   add_com ("clone-inferior", no_class, clone_inferior_command, _("\
 Clone inferior ID.\n\
@@ -1064,12 +1066,12 @@ 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."),
+  add_cmd ("inferiors", class_run, detach_inferior_command, _("\
+Detach from inferior ID (or list of IDS)."),
 	   &detachlist);
 
-  add_cmd ("inferior", class_run, kill_inferior_command, _("\
-Kill inferior ID."),
+  add_cmd ("inferiors", class_run, kill_inferior_command, _("\
+Kill inferior ID (or list of IDs)."),
 	   &killlist);
 
   add_cmd ("inferior", class_run, inferior_command, _("\
@@ -1085,4 +1087,5 @@ Show printing of inferior events (e.g., inferior start and exit)."), NULL,
          show_print_inferior_events,
          &setprintlist, &showprintlist);
 
+  create_internalvar_type_lazy ("_inferior", &inferior_funcs, NULL);
 }