2004-09-01 Jeff Johnston <jjohnstn@redhat.com>

* observer.sh: Add struct so_list declaration.
        * Makefile.in: Add dependencies on observer.h for solib.c and
        breakpoint.c.
        * breakpoint.c (disable_breakpoints_in_unloaded_shlib): New
        function.
        (_initialize_breakpoint): Register
        disable_breakpoints_in_unloaded_shlib as an observer of the
        "solib unloaded" observation event.
        (re_enable_breakpoints_in_shlibs): For bp_shlib_disabled breakpoints,
        call decode_line_1 so unfound breakpoint errors are silent.
        * solib.c (update_solib_list): When a solib is discovered to have
        been unloaded by the program, notify all observers of the
        "solib unloaded" observation event.

gdb/ChangeLog

@@ -1,3 +1,19 @@
+2004-09-01  Jeff Johnston  <jjohnstn@redhat.com>
+
+	* observer.sh: Add struct so_list declaration.
+	* Makefile.in: Add dependencies on observer.h for solib.c and
+	breakpoint.c.
+	* breakpoint.c (disable_breakpoints_in_unloaded_shlib): New
+	function.
+	(_initialize_breakpoint): Register 
+	disable_breakpoints_in_unloaded_shlib as an observer of the 
+        "solib unloaded" observation event.
+	(re_enable_breakpoints_in_shlibs): For bp_shlib_disabled breakpoints,
+	call decode_line_1 so unfound breakpoint errors are silent.
+	* solib.c (update_solib_list): When a solib is discovered to have
+	been unloaded by the program, notify all observers of the
+	"solib unloaded" observation event.
+
 2004-09-01  Andrew Cagney  <cagney@gnu.org>
 
 	* frame.c: Include "objfiles.h".

gdb/Makefile.in

@@ -1719,7 +1719,7 @@ breakpoint.o: breakpoint.c $(defs_h) $(symtab_h) $(frame_h) $(breakpoint_h) \
 	$(gdb_string_h) $(demangle_h) $(annotate_h) $(symfile_h) \
 	$(objfiles_h) $(source_h) $(linespec_h) $(completer_h) $(gdb_h) \
 	$(ui_out_h) $(cli_script_h) $(gdb_assert_h) $(block_h) \
-	$(gdb_events_h)
+	$(gdb_events_h) $(observer_h) $(solist_h)
 bsd-kvm.o: bsd-kvm.c $(defs_h) $(cli_cmds_h) $(command_h) $(frame_h) \
 	$(regcache_h) $(target_h) $(value_h) $(gdb_assert_h) $(readline_h) \
 	$(bsd_kvm_h)
@@ -2451,7 +2451,8 @@ solib-aix5.o: solib-aix5.c $(defs_h) $(gdb_string_h) $(elf_external_h) \
 solib.o: solib.c $(defs_h) $(gdb_string_h) $(symtab_h) $(bfd_h) $(symfile_h) \
 	$(objfiles_h) $(gdbcore_h) $(command_h) $(target_h) $(frame_h) \
 	$(gdb_regex_h) $(inferior_h) $(environ_h) $(language_h) $(gdbcmd_h) \
-	$(completer_h) $(filenames_h) $(exec_h) $(solist_h) $(readline_h)
+	$(completer_h) $(filenames_h) $(exec_h) $(solist_h) $(readline_h) \
+	$(observer_h)
 solib-frv.o: solib-frv.c $(defs_h) $(gdb_string_h) $(inferior_h) \
 	$(gdbcore_h) $(solist_h) $(frv_tdep_h) $(objfiles_h) $(symtab_h) \
 	$(language_h) $(command_h) $(gdbcmd_h) $(elf_frv_h)

gdb/breakpoint.c

@@ -49,6 +49,8 @@
 #include "cli/cli-script.h"
 #include "gdb_assert.h"
 #include "block.h"
+#include "solist.h"
+#include "observer.h"
 
 #include "gdb-events.h"
 
@@ -4388,6 +4390,46 @@ disable_breakpoints_in_shlibs (int silent)
   }
 }
 
+/* Disable any breakpoints that are in in an unloaded shared library.  Only
+   apply to enabled breakpoints, disabled ones can just stay disabled.  */
+
+void
+disable_breakpoints_in_unloaded_shlib (struct so_list *solib)
+{
+  struct breakpoint *b;
+  int disabled_shlib_breaks = 0;
+
+#if defined (PC_SOLIB)
+  /* See also: insert_breakpoints, under DISABLE_UNSETTABLE_BREAK.  */
+  ALL_BREAKPOINTS (b)
+  {
+    if ((b->loc->loc_type == bp_loc_hardware_breakpoint
+	|| b->loc->loc_type == bp_loc_software_breakpoint)
+	&& breakpoint_enabled (b) 
+	&& !b->loc->duplicate)
+      {
+	char *so_name = PC_SOLIB (b->loc->address);
+	if (so_name 
+	    && !strcmp (so_name, solib->so_name))
+          {
+	    b->enable_state = bp_shlib_disabled;
+	    /* At this point, we cannot rely on remove_breakpoint
+	       succeeding so we must mark the breakpoint as not inserted
+	       to prevent future errors occurring in remove_breakpoints.  */
+	    b->loc->inserted = 0;
+	    if (!disabled_shlib_breaks)
+	      {
+		target_terminal_ours_for_output ();
+		warning ("Temporarily disabling breakpoints for unloaded shared library \"%s\"",
+			  so_name);
+	      }
+	    disabled_shlib_breaks = 1;
+	  }
+      }
+  }
+#endif
+}
+
 /* Try to reenable any breakpoints in shared libraries.  */
 void
 re_enable_breakpoints_in_shlibs (void)
@@ -7100,6 +7142,8 @@ breakpoint_re_set_one (void *bint)
   struct breakpoint *b = (struct breakpoint *) bint;
   struct value *mark;
   int i;
+  int not_found;
+  int *not_found_ptr = NULL;
   struct symtabs_and_lines sals;
   char *s;
   enum enable_state save_enable;
@@ -7150,11 +7194,19 @@ breakpoint_re_set_one (void *bint)
       save_enable = b->enable_state;
       if (b->enable_state != bp_shlib_disabled)
         b->enable_state = bp_disabled;
+      else
+	/* If resetting a shlib-disabled breakpoint, we don't want to
+	   see an error message if it is not found since we will expect
+	   this to occur until the shared library is finally reloaded.
+	   We accomplish this by giving decode_line_1 a pointer to use
+	   for silent notification that the symbol is not found.  */
+	not_found_ptr = &not_found;
 
       set_language (b->language);
       input_radix = b->input_radix;
       s = b->addr_string;
-      sals = decode_line_1 (&s, 1, (struct symtab *) NULL, 0, (char ***) NULL, NULL);
+      sals = decode_line_1 (&s, 1, (struct symtab *) NULL, 0, (char ***) NULL,
+		            not_found_ptr);
       for (i = 0; i < sals.nelts; i++)
 	{
 	  resolve_sal_pc (&sals.sals[i]);
@@ -7755,6 +7807,10 @@ _initialize_breakpoint (void)
   static struct cmd_list_element *breakpoint_show_cmdlist;
   struct cmd_list_element *c;
 
+#ifdef SOLIB_ADD
+  observer_attach_solib_unloaded (disable_breakpoints_in_unloaded_shlib);
+#endif
+
   breakpoint_chain = 0;
   /* Don't bother to call set_breakpoint_count.  $bpnum isn't useful
      before a breakpoint is set.  */

gdb/observer.sh

@@ -52,6 +52,7 @@ case $lang in
 
 struct observer;
 struct bpstats;
+struct so_list;
 EOF
         ;;
 esac

gdb/solib.c

@@ -42,6 +42,7 @@
 #include "filenames.h"		/* for DOSish file names */
 #include "exec.h"
 #include "solist.h"
+#include "observer.h"
 #include "readline/readline.h"
 
 /* external data declarations */
@@ -478,6 +479,10 @@ update_solib_list (int from_tty, struct target_ops *target)
       /* If it's not on the inferior's list, remove it from GDB's tables.  */
       else
 	{
+	  /* Notify any observer that the SO has been unloaded
+	     before we remove it from the gdb tables.  */
+	  observer_notify_solib_unloaded (gdb);
+
 	  *gdb_link = gdb->next;
 
 	  /* Unless the user loaded it explicitly, free SO's objfile.  */