[RFC/RFA] new command: maintenance print target-stack

[Joel Brobecker <brobecker@adacore.com>]

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Hello,

While working to "auto-solib-add", I found that I was very frequently
in need to dumping the current target stack (I just need the names),
to see if the multi-thread layer has been pushed or not. So I
implemented a new "maintenance" command, hoping that others might
find it useful.

        (gdb) maintenance print target-stack 
        The current target stack is:
          - multi-thread (multi-threaded child process.)
          - child (Unix child process)
          - exec (Local exec file)
          - None (None)

Opinions? Eventually, we might want to actually dump more
information if that's useful to others, but that's a start.

2006-10-17  Joel Brobecker  <brobecker@adacore.com>

        * target.c (maintenance_print_target_stack): New function.
        (initialize_targets): Add new "maintenance print target-stack"
        command.

Tested on x86-linux just to make sure, no regression. I will of course
provide documentation for this if the idea is accepted.

-- 
Joel

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Index: target.c
===================================================================
RCS file: /cvs/src/src/gdb/target.c,v
retrieving revision 1.127
diff -u -p -r1.127 target.c
--- target.c	10 Oct 2006 03:17:53 -0000	1.127
+++ target.c	17 Oct 2006 22:41:16 -0000
@@ -2689,6 +2689,21 @@ do_monitor_command (char *cmd,
   target_rcmd (cmd, gdb_stdtarg);
 }
 
+/* Print the name of each layers of our target stack.  */
+
+static void
+maintenance_print_target_stack (char *cmd, int from_tty)
+{
+  struct target_ops *t;
+
+  printf_filtered (_("The current target stack is:\n"));
+
+  for (t = target_stack; t != NULL; t = t->beneath)
+    {
+      printf_filtered ("  - %s (%s)\n", t->to_shortname, t->to_longname);
+    }
+}
+
 void
 initialize_targets (void)
 {
@@ -2722,5 +2737,9 @@ result in significant performance improv
   add_com ("monitor", class_obscure, do_monitor_command,
 	   _("Send a command to the remote monitor (remote targets only)."));
 
+  add_cmd ("target-stack", class_maintenance, maintenance_print_target_stack,
+           _("Print the name of each layer of the internal target stack."),
+           &maintenanceprintlist);
+
   target_dcache = dcache_init ();
 }