X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Finferior.c;h=9188f72e35d2a10f7c094fbdb1fac7549d018362;hb=328d42d87e97c75d6e52800bfd4bc1bfdfb745d2;hp=abfef700c386f0a11c17e4619beebf50dbeb46df;hpb=66452beb773568c7f60dbc6b7c70f671a8c9cf4b;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/inferior.c b/gdb/inferior.c
index abfef700c3..9188f72e35 100644
--- a/gdb/inferior.c
+++ b/gdb/inferior.c
@@ -1,6 +1,6 @@
 /* Multi-process control for GDB, the GNU debugger.
 
-   Copyright (C) 2008-2019 Free Software Foundation, Inc.
+   Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -29,7 +29,7 @@
 #include "observable.h"
 #include "gdbcore.h"
 #include "symfile.h"
-#include "common/environ.h"
+#include "gdbsupport/environ.h"
 #include "cli/cli-utils.h"
 #include "continuations.h"
 #include "arch-utils.h"
@@ -46,17 +46,17 @@ struct inferior *inferior_list = NULL;
 static int highest_inferior_num;
 
 /* See inferior.h.  */
-int print_inferior_events = 1;
+bool print_inferior_events = true;
 
 /* The Current Inferior.  This is a strong reference.  I.e., whenever
    an inferior is the current inferior, its refcount is
    incremented.  */
-static struct inferior *current_inferior_ = NULL;
+static inferior_ref current_inferior_;
 
 struct inferior*
 current_inferior (void)
 {
-  return current_inferior_;
+  return current_inferior_.get ();
 }
 
 void
@@ -65,9 +65,7 @@ set_current_inferior (struct inferior *inf)
   /* There's always an inferior.  */
   gdb_assert (inf != NULL);
 
-  inf->incref ();
-  current_inferior_->decref ();
-  current_inferior_ = inf;
+  current_inferior_ = inferior_ref::new_reference (inf);
 }
 
 private_inferior::~private_inferior () = default;
@@ -79,7 +77,6 @@ inferior::~inferior ()
   discard_all_inferior_continuations (inf);
   inferior_free_data (inf);
   xfree (inf->args);
-  xfree (inf->terminal);
   target_desc_info_free (inf->tdesc_info);
 }
 
@@ -90,6 +87,23 @@ inferior::inferior (int pid_)
     registry_data ()
 {
   inferior_alloc_data (this);
+
+  m_target_stack.push (get_dummy_target ());
+}
+
+void
+inferior::set_tty (const char *terminal_name)
+{
+  if (terminal_name != nullptr && *terminal_name != '\0')
+    m_terminal = make_unique_xstrdup (terminal_name);
+  else
+    m_terminal = NULL;
+}
+
+const char *
+inferior::tty ()
+{
+  return m_terminal.get ();
 }
 
 struct inferior *
@@ -159,8 +173,8 @@ delete_inferior (struct inferior *todel)
   gdb::observers::inferior_removed.notify (inf);
 
   /* If this program space is rendered useless, remove it. */
-  if (program_space_empty_p (inf->pspace))
-    delete_program_space (inf->pspace);
+  if (inf->pspace->empty ())
+    delete inf->pspace;
 
   delete inf;
 }
@@ -220,14 +234,6 @@ exit_inferior (inferior *inf)
   exit_inferior_1 (inf, 0);
 }
 
-void
-exit_inferior_silent (int pid)
-{
-  struct inferior *inf = find_inferior_pid (pid);
-
-  exit_inferior_1 (inf, 1);
-}
-
 void
 exit_inferior_silent (inferior *inf)
 {
@@ -255,6 +261,7 @@ inferior_appeared (struct inferior *inf, int pid)
 {
   /* If this is the first inferior with threads, reset the global
      thread id.  */
+  delete_exited_threads ();
   if (!any_thread_p ())
     init_thread_list ();
 
@@ -265,13 +272,6 @@ inferior_appeared (struct inferior *inf, int pid)
   gdb::observers::inferior_appeared.notify (inf);
 }
 
-void
-discard_all_inferiors (void)
-{
-  for (inferior *inf : all_non_exited_inferiors ())
-    exit_inferior_silent (inf);
-}
-
 struct inferior *
 find_inferior_id (int num)
 {
@@ -283,14 +283,14 @@ find_inferior_id (int num)
 }
 
 struct inferior *
-find_inferior_pid (int pid)
+find_inferior_pid (process_stratum_target *targ, int pid)
 {
   /* 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 (inferior *inf : all_inferiors ())
+  for (inferior *inf : all_inferiors (targ))
     if (inf->pid == pid)
       return inf;
 
@@ -300,9 +300,9 @@ find_inferior_pid (int pid)
 /* See inferior.h */
 
 struct inferior *
-find_inferior_ptid (ptid_t ptid)
+find_inferior_ptid (process_stratum_target *targ, ptid_t ptid)
 {
-  return find_inferior_pid (ptid.pid ());
+  return find_inferior_pid (targ, ptid.pid ());
 }
 
 /* See inferior.h.  */
@@ -322,17 +322,6 @@ find_inferior_for_program_space (struct program_space *pspace)
   return NULL;
 }
 
-struct inferior *
-iterate_over_inferiors (int (*callback) (struct inferior *, void *),
-			void *data)
-{
-  for (inferior *inf : all_inferiors_safe ())
-    if ((*callback) (inf, data))
-      return inf;
-
-  return NULL;
-}
-
 int
 have_inferiors (void)
 {
@@ -347,12 +336,12 @@ have_inferiors (void)
    in the middle of a 'mourn' operation.  */
 
 int
-number_of_live_inferiors (void)
+number_of_live_inferiors (process_stratum_target *proc_target)
 {
   int num_inf = 0;
 
-  for (inferior *inf : all_non_exited_inferiors ())
-    if (target_has_execution_1 (ptid_t (inf->pid)))
+  for (inferior *inf : all_non_exited_inferiors (proc_target))
+    if (inf->has_execution ())
       for (thread_info *tp ATTRIBUTE_UNUSED : inf->non_exited_threads ())
 	{
 	  /* Found a live thread in this inferior, go to the next
@@ -369,7 +358,7 @@ number_of_live_inferiors (void)
 int
 have_live_inferiors (void)
 {
-  return number_of_live_inferiors () > 0;
+  return number_of_live_inferiors (NULL) > 0;
 }
 
 /* Prune away any unused inferiors, and then prune away no longer used
@@ -378,24 +367,22 @@ have_live_inferiors (void)
 void
 prune_inferiors (void)
 {
-  struct inferior *ss, **ss_link;
+  inferior *ss;
 
   ss = inferior_list;
-  ss_link = &inferior_list;
   while (ss)
     {
       if (!ss->deletable ()
 	  || !ss->removable
 	  || ss->pid != 0)
 	{
-	  ss_link = &ss->next;
-	  ss = *ss_link;
+	  ss = ss->next;
 	  continue;
 	}
 
-      *ss_link = ss->next;
+      inferior *ss_next = ss->next;
       delete_inferior (ss);
-      ss = *ss_link;
+      ss = ss_next;
     }
 }
 
@@ -426,7 +413,7 @@ void
 print_selected_inferior (struct ui_out *uiout)
 {
   struct inferior *inf = current_inferior ();
-  const char *filename = inf->pspace->pspace_exec_filename;
+  const char *filename = inf->pspace->exec_filename.get ();
 
   if (filename == NULL)
     filename = _("<noexec>");
@@ -435,6 +422,31 @@ print_selected_inferior (struct ui_out *uiout)
 		  inf->num, inferior_pid_to_str (inf->pid).c_str (), filename);
 }
 
+/* Helper for print_inferior.  Returns the 'connection-id' string for
+   PROC_TARGET.  */
+
+static std::string
+uiout_field_connection (process_stratum_target *proc_target)
+{
+  if (proc_target == NULL)
+    {
+      return {};
+    }
+  else if (proc_target->connection_string () != NULL)
+    {
+      return string_printf ("%d (%s %s)",
+			    proc_target->connection_number,
+			    proc_target->shortname (),
+			    proc_target->connection_string ());
+    }
+  else
+    {
+      return string_printf ("%d (%s)",
+			    proc_target->connection_number,
+			    proc_target->shortname ());
+    }
+}
+
 /* Prints the list of inferiors and their details on UIOUT.  This is a
    version of 'info_inferior_command' suitable for use from MI.
 
@@ -446,6 +458,7 @@ static void
 print_inferior (struct ui_out *uiout, const char *requested_inferiors)
 {
   int inf_count = 0;
+  size_t connection_id_len = 20;
 
   /* Compute number of inferiors we will print.  */
   for (inferior *inf : all_inferiors ())
@@ -453,6 +466,10 @@ print_inferior (struct ui_out *uiout, const char *requested_inferiors)
       if (!number_is_in_list (requested_inferiors, inf->num))
 	continue;
 
+      std::string conn = uiout_field_connection (inf->process_target ());
+      if (connection_id_len < conn.size ())
+	connection_id_len = conn.size ();
+
       ++inf_count;
     }
 
@@ -462,13 +479,20 @@ print_inferior (struct ui_out *uiout, const char *requested_inferiors)
       return;
     }
 
-  ui_out_emit_table table_emitter (uiout, 4, inf_count, "inferiors");
+  ui_out_emit_table table_emitter (uiout, 5, inf_count, "inferiors");
   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 (connection_id_len, ui_left,
+		       "connection-id", "Connection");
   uiout->table_header (17, ui_left, "exec", "Executable");
 
   uiout->table_body ();
+
+  /* Restore the current thread after the loop because we switch the
+     inferior in the loop.  */
+  scoped_restore_current_pspace_and_thread restore_pspace_thread;
+  inferior *current_inf = current_inferior ();
   for (inferior *inf : all_inferiors ())
     {
       if (!number_is_in_list (requested_inferiors, inf->num))
@@ -476,17 +500,24 @@ print_inferior (struct ui_out *uiout, const char *requested_inferiors)
 
       ui_out_emit_tuple tuple_emitter (uiout, NULL);
 
-      if (inf == current_inferior ())
+      if (inf == current_inf)
 	uiout->field_string ("current", "*");
       else
 	uiout->field_skip ("current");
 
-      uiout->field_int ("number", inf->num);
+      uiout->field_signed ("number", inf->num);
+
+      /* Because target_pid_to_str uses the current inferior,
+	 switch the inferior.  */
+      switch_to_inferior_no_thread (inf);
 
       uiout->field_string ("target-id", inferior_pid_to_str (inf->pid));
 
-      if (inf->pspace->pspace_exec_filename != NULL)
-	uiout->field_string ("exec", inf->pspace->pspace_exec_filename);
+      std::string conn = uiout_field_connection (inf->process_target ());
+      uiout->field_string ("connection-id", conn.c_str ());
+
+      if (inf->pspace->exec_filename != nullptr)
+	uiout->field_string ("exec", inf->pspace->exec_filename.get ());
       else
 	uiout->field_skip ("exec");
 
@@ -496,12 +527,12 @@ print_inferior (struct ui_out *uiout, const char *requested_inferiors)
       if (inf->vfork_parent)
 	{
 	  uiout->text (_("\n\tis vfork child of inferior "));
-	  uiout->field_int ("vfork-parent", inf->vfork_parent->num);
+	  uiout->field_signed ("vfork-parent", inf->vfork_parent->num);
 	}
       if (inf->vfork_child)
 	{
 	  uiout->text (_("\n\tis vfork parent of inferior "));
-	  uiout->field_int ("vfork-child", inf->vfork_child->num);
+	  uiout->field_signed ("vfork-child", inf->vfork_child->num);
 	}
 
       uiout->text ("\n");
@@ -514,6 +545,8 @@ detach_inferior_command (const char *args, int from_tty)
   if (!args || !*args)
     error (_("Requires argument (inferior id(s) to detach)"));
 
+  scoped_restore_current_thread restore_thread;
+
   number_or_range_parser parser (args);
   while (!parser.finished ())
     {
@@ -551,6 +584,8 @@ kill_inferior_command (const char *args, int from_tty)
   if (!args || !*args)
     error (_("Requires argument (inferior id(s) to kill)"));
 
+  scoped_restore_current_thread restore_thread;
+
   number_or_range_parser parser (args);
   while (!parser.finished ())
     {
@@ -584,42 +619,66 @@ kill_inferior_command (const char *args, int from_tty)
   bfd_cache_close_all ();
 }
 
+/* See inferior.h.  */
+
+void
+switch_to_inferior_no_thread (inferior *inf)
+{
+  set_current_inferior (inf);
+  switch_to_no_thread ();
+  set_current_program_space (inf->pspace);
+}
+
 static void
 inferior_command (const 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);
-
-  if (inf->pid != 0)
+  if (args == nullptr)
     {
-      if (inf != current_inferior ())
-	{
-	  thread_info *tp = any_thread_of_inferior (inf);
-	  if (tp == NULL)
-	    error (_("Inferior has no threads."));
+      inf = current_inferior ();
+      gdb_assert (inf != nullptr);
+      const char *filename = inf->pspace->exec_filename.get ();
 
-	  switch_to_thread (tp);
-	}
+      if (filename == nullptr)
+	filename = _("<noexec>");
 
-      gdb::observers::user_selected_context_changed.notify
-	(USER_SELECTED_INFERIOR
-	 | USER_SELECTED_THREAD
-	 | USER_SELECTED_FRAME);
+      printf_filtered (_("[Current inferior is %d [%s] (%s)]\n"),
+		       inf->num, inferior_pid_to_str (inf->pid).c_str (),
+		       filename);
     }
   else
     {
-      set_current_inferior (inf);
-      switch_to_no_thread ();
-      set_current_program_space (inf->pspace);
+      num = parse_and_eval_long (args);
+
+      inf = find_inferior_id (num);
+      if (inf == NULL)
+	error (_("Inferior ID %d not known."), num);
+
+      if (inf->pid != 0)
+	{
+	  if (inf != current_inferior ())
+	    {
+	      thread_info *tp = any_thread_of_inferior (inf);
+	      if (tp == NULL)
+		error (_("Inferior has no threads."));
+
+	      switch_to_thread (tp);
+	    }
+
+	  gdb::observers::user_selected_context_changed.notify
+	    (USER_SELECTED_INFERIOR
+	     | USER_SELECTED_THREAD
+	     | USER_SELECTED_FRAME);
+	}
+      else
+	{
+	  switch_to_inferior_no_thread (inf);
 
-      gdb::observers::user_selected_context_changed.notify
-	(USER_SELECTED_INFERIOR);
+	  gdb::observers::user_selected_context_changed.notify
+	    (USER_SELECTED_INFERIOR);
+	}
     }
 }
 
@@ -695,7 +754,41 @@ add_inferior_with_spaces (void)
   return inf;
 }
 
-/* add-inferior [-copies N] [-exec FILENAME]  */
+/* Switch to inferior NEW_INF, a new inferior, and unless
+   NO_CONNECTION is true, push the process_stratum_target of ORG_INF
+   to NEW_INF.  */
+
+static void
+switch_to_inferior_and_push_target (inferior *new_inf,
+				    bool no_connection, inferior *org_inf)
+{
+  process_stratum_target *proc_target = org_inf->process_target ();
+
+  /* Switch over temporarily, while reading executable and
+     symbols.  */
+  switch_to_inferior_no_thread (new_inf);
+
+  /* Reuse the target for new inferior.  */
+  if (!no_connection && proc_target != NULL)
+    {
+      new_inf->push_target (proc_target);
+      if (proc_target->connection_string () != NULL)
+	printf_filtered (_("Added inferior %d on connection %d (%s %s)\n"),
+			 new_inf->num,
+			 proc_target->connection_number,
+			 proc_target->shortname (),
+			 proc_target->connection_string ());
+      else
+	printf_filtered (_("Added inferior %d on connection %d (%s)\n"),
+			 new_inf->num,
+			 proc_target->connection_number,
+			 proc_target->shortname ());
+    }
+  else
+    printf_filtered (_("Added inferior %d\n"), new_inf->num);
+}
+
+/* add-inferior [-copies N] [-exec FILENAME] [-no-connection] */
 
 static void
 add_inferior_command (const char *args, int from_tty)
@@ -703,6 +796,7 @@ add_inferior_command (const char *args, int from_tty)
   int i, copies = 1;
   gdb::unique_xmalloc_ptr<char> exec;
   symfile_add_flags add_flags = 0;
+  bool no_connection = false;
 
   if (from_tty)
     add_flags |= SYMFILE_VERBOSE;
@@ -722,6 +816,8 @@ add_inferior_command (const char *args, int from_tty)
 		    error (_("No argument to -copies"));
 		  copies = parse_and_eval_long (*argv);
 		}
+	      else if (strcmp (*argv, "-no-connection") == 0)
+		no_connection = true;
 	      else if (strcmp (*argv, "-exec") == 0)
 		{
 		  ++argv;
@@ -735,35 +831,32 @@ add_inferior_command (const char *args, int from_tty)
 	}
     }
 
+  inferior *orginf = current_inferior ();
+
   scoped_restore_current_pspace_and_thread restore_pspace_thread;
 
   for (i = 0; i < copies; ++i)
     {
-      struct inferior *inf = add_inferior_with_spaces ();
+      inferior *inf = add_inferior_with_spaces ();
 
-      printf_filtered (_("Added inferior %d\n"), inf->num);
+      switch_to_inferior_and_push_target (inf, no_connection, orginf);
 
       if (exec != NULL)
 	{
-	  /* Switch over temporarily, while reading executable and
-	     symbols.q.  */
-	  set_current_program_space (inf->pspace);
-	  set_current_inferior (inf);
-	  switch_to_no_thread ();
-
 	  exec_file_attach (exec.get (), from_tty);
 	  symbol_file_add_main (exec.get (), add_flags);
 	}
     }
 }
 
-/* clone-inferior [-copies N] [ID] */
+/* clone-inferior [-copies N] [ID] [-no-connection] */
 
 static void
 clone_inferior_command (const char *args, int from_tty)
 {
   int i, copies = 1;
   struct inferior *orginf = NULL;
+  bool no_connection = false;
 
   if (args)
     {
@@ -784,6 +877,8 @@ clone_inferior_command (const char *args, int from_tty)
 		  if (copies < 0)
 		    error (_("Invalid copies number"));
 		}
+	      else if (strcmp (*argv, "-no-connection") == 0)
+		no_connection = true;
 	    }
 	  else
 	    {
@@ -829,15 +924,13 @@ clone_inferior_command (const char *args, int from_tty)
       inf->aspace = pspace->aspace;
       inf->gdbarch = orginf->gdbarch;
 
+      switch_to_inferior_and_push_target (inf, no_connection, orginf);
+
       /* 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);
-
-      set_current_inferior (inf);
-      switch_to_no_thread ();
       clone_program_space (pspace, orginf->pspace);
     }
 }
@@ -883,8 +976,7 @@ initialize_inferiors (void)
      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_silent (0);
-  current_inferior_->incref ();
+  set_current_inferior (add_inferior_silent (0));
   current_inferior_->pspace = current_program_space;
   current_inferior_->aspace = current_program_space->aspace;
   /* The architecture will be initialized shortly, by
@@ -898,10 +990,13 @@ By default all inferiors are displayed."));
 
   c = add_com ("add-inferior", no_class, add_inferior_command, _("\
 Add a new inferior.\n\
-Usage: add-inferior [-copies N] [-exec FILENAME]\n\
+Usage: add-inferior [-copies N] [-exec FILENAME] [-no-connection]\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."));
+as main program.\n\
+By default, the new inferior inherits the current inferior's connection.\n\
+If -no-connection is specified, the new inferior begins with\n\
+no target connection yet."));
   set_cmd_completer (c, filename_completer);
 
   add_com ("remove-inferiors", no_class, remove_inferior_command, _("\
@@ -910,11 +1005,14 @@ Usage: remove-inferiors 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\
+Usage: clone-inferior [-copies N] [-no-connection] [ID]\n\
+Add N copies of inferior ID.  The new inferiors have 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."));
+that is cloned.\n\
+By default, the new inferiors inherit the copied inferior's connection.\n\
+If -no-connection is specified, the new inferiors begin with\n\
+no target connection yet."));
 
   add_cmd ("inferiors", class_run, detach_inferior_command, _("\
 Detach from inferior ID (or list of IDS).\n\
@@ -933,12 +1031,12 @@ The new inferior ID must be currently known."),
 	   &cmdlist);
 
   add_setshow_boolean_cmd ("inferior-events", no_class,
-         &print_inferior_events, _("\
+	 &print_inferior_events, _("\
 Set printing of inferior events (such as inferior start and exit)."), _("\
 Show printing of inferior events (such as inferior start and exit)."), NULL,
-         NULL,
-         show_print_inferior_events,
-         &setprintlist, &showprintlist);
+	 NULL,
+	 show_print_inferior_events,
+	 &setprintlist, &showprintlist);
 
   create_internalvar_type_lazy ("_inferior", &inferior_funcs, NULL);
 }