2011-08-03 Philippe Waroquiers <philippe.waroquiers@skynet.be>

	* breakpoint.c (update_global_location_list): Ensure
	invariant 'first loc marked not duplicated and inserted,
	following locs marked duplicated/not inserted' is respected
	for multiple locations at the same address.
	(unduplicated_should_be_inserted) New function.
	(swap_insertion) New function.

2011-08-03  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* gdb.base/break-always.exp: Complete the test
	with duplicated breakpoints and enabling/disabling them.

4 files changed, 78 insertions, 8 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6c5c594babe..358f5156482 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,12 @@
+2011-08-03  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
+
+	* breakpoint.c (update_global_location_list): Ensure
+	invariant 'first loc marked not duplicated and inserted,
+	following locs marked duplicated/not inserted' is respected
+	for multiple locations at the same address.
+	(unduplicated_should_be_inserted) New function.
+	(swap_insertion) New function.
+
 2011-08-03  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* stack.c (print_frame_arguments_choices): Comment typo fix.
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index e1c1a55787f..96d78ac173d 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -1571,6 +1571,21 @@ should_be_inserted (struct bp_location *bl)
   return 1;
 }
 
+/* Same as should_be_inserted but does the check assuming
+   that the location is not duplicated.  */
+
+static int
+unduplicated_should_be_inserted (struct bp_location *bl)
+{
+  int result;
+  const int save_duplicate = bl->duplicate;
+
+  bl->duplicate = 0;
+  result = should_be_inserted (bl);
+  bl->duplicate = save_duplicate;
+  return result;
+}
+
 /* Insert a low-level "breakpoint" of some type.  BL is the breakpoint
    location.  Any error messages are printed to TMP_ERROR_STREAM; and
    DISABLED_BREAKS, and HW_BREAKPOINT_ERROR are used to report problems.
@@ -10241,6 +10256,23 @@ bp_location_target_extensions_update (void)
     }
 }
 
+/* Swap the insertion/duplication state between two locations.  */
+
+static void
+swap_insertion (struct bp_location *left, struct bp_location *right)
+{
+  const int left_inserted = left->inserted;
+  const int left_duplicate = left->duplicate;
+  const struct bp_target_info left_target_info = left->target_info;
+
+  left->inserted = right->inserted;
+  left->duplicate = right->duplicate;
+  left->target_info = right->target_info;
+  right->inserted = left_inserted;
+  right->duplicate = left_duplicate;
+  right->target_info = left_target_info;
+}
+
 /* If SHOULD_INSERT is false, do not insert any breakpoint locations
    into the inferior, only remove already-inserted locations that no
    longer should be inserted.  Functions that delete a breakpoint or
@@ -10377,11 +10409,6 @@ update_global_location_list (int should_insert)
 
 		      if (breakpoint_locations_match (loc2, old_loc))
 			{
-			  /* For the sake of should_be_inserted.
-			     Duplicates check below will fix up this
-			     later.  */
-			  loc2->duplicate = 0;
-
 			  /* Read watchpoint locations are switched to
 			     access watchpoints, if the former are not
 			     supported, but the latter are.  */
@@ -10391,10 +10418,13 @@ update_global_location_list (int should_insert)
 			      loc2->watchpoint_type = old_loc->watchpoint_type;
 			    }
 
-			  if (loc2 != old_loc && should_be_inserted (loc2))
+			  /* loc2 is a duplicated location. We need to check
+			     if it should be inserted in case it will be
+			     unduplicated.  */
+			  if (loc2 != old_loc
+			      && unduplicated_should_be_inserted (loc2))
 			    {
-			      loc2->inserted = 1;
-			      loc2->target_info = old_loc->target_info;
+			      swap_insertion (old_loc, loc2);
 			      keep_in_target = 1;
 			      break;
 			    }
@@ -10541,6 +10571,12 @@ update_global_location_list (int should_insert)
 	  continue;
 	}
 
+
+      /* This and the above ensure the invariant that the first location
+	 is not duplicated, and is the inserted one.
+	 All following are marked as duplicated, and are not inserted.  */
+      if (loc->inserted)
+	swap_insertion (loc, *loc_first_p);
       loc->duplicate = 1;
 
       if ((*loc_first_p)->owner->enable_state == bp_permanent && loc->inserted
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index fb9cac85986..6db2298172d 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2011-08-03  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
+
+	* gdb.base/break-always.exp: Complete the test
+	with duplicated breakpoints and enabling/disabling them.
+
 2011-08-02  Tom Tromey  <tromey@redhat.com>
 
 	PR gdb/11289:
diff --git a/gdb/testsuite/gdb.base/break-always.exp b/gdb/testsuite/gdb.base/break-always.exp
index c6a46b11194..ce76af7c060 100644
--- a/gdb/testsuite/gdb.base/break-always.exp
+++ b/gdb/testsuite/gdb.base/break-always.exp
@@ -14,6 +14,8 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # Test that 'set breakpoint always-inserted 1' is not a brick
+# Also verifies that breakpoint enabling/disabling works properly
+# with duplicated breakpoints.
 
 if { [prepare_for_testing break-always.exp break-always break-always.c] } {
     return -1
@@ -29,6 +31,24 @@ gdb_test "show breakpoint always-inserted" "mode is on\." \
 runto foo
 
 gdb_test "break bar" "Breakpoint 2.*" "set breakpoint on bar"
+gdb_test "break bar" "Note: breakpoint 2 also set.*Breakpoint 3.*" "set 2nd breakpoint on bar"
+gdb_test "break bar" "Note: breakpoints 2 and 3 also set.*Breakpoint 4.*" "set 3rd breakpoint on bar"
+gdb_test "break bar" "Note: breakpoints 2, 3 and 4 also set.*Breakpoint 5.*" "set 4th breakpoint on bar"
+gdb_test "info breakpoints" "keep y.*keep y.*keep y.*keep y.*keep y.*" "initial check breakpoint state"
+gdb_test_no_output "disable" "initial disable all breakpoints"
+gdb_test_no_output "enable" "initial enable all breakpoints"
+gdb_test_no_output "disable" "re-disable all breakpoints"
+gdb_test_no_output "enable 3" "enable 3.A"
+gdb_test_no_output "disable 3" "disable 3.B"
+gdb_test_no_output "enable 3" "enable 3.C"
+gdb_test_no_output "enable 2" "enable 2.D"
+gdb_test_no_output "disable 2" "disable 2.E"
+gdb_test_no_output "disable 3" "disable 3.F"
+gdb_test_no_output "enable 3" "enable 3.G"
+gdb_test_no_output "enable 2" "enable 2.H"
+gdb_test_no_output "disable 2" "disable 2.I"
+gdb_test "info breakpoints" "keep n.*keep n.*keep y.*keep n.*keep n.*" "before re-enable check breakpoint state"
+gdb_test_no_output "enable" "re-enable all breakpoints"
 gdb_continue_to_breakpoint "bar" ".*break-always.c:$bar_location.*"