Fix for PR 9399 gdb can't call or print a const function that uses virtual inheritance

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2009-12-10  Chris Moller  <cmoller@redhat.com>
+
+	PR gdb/9399
+	* valops.c (value_cast_structs): Added test to return NULL if no
+        casting needed.
+
 2009-12-10  Oza Pawandeep <paawan1982@yahoo.com>
 
 	* i386-tdep.c:  Support for floating point recording.

gdb/MAINTAINERS

@@ -487,7 +487,7 @@ Randolph Chung					tausq@debian.org
 Nick Clifton					nickc@redhat.com
 J.T. Conklin					jtc@acorntoolworks.com
 Brendan Conoboy					blc@redhat.com
-Ludovic Courtès					ludo@gnu.org
+Ludovic Courtès					ludo@gnu.org
 DJ Delorie					dj@redhat.com
 Chris Demetriou					cgd@google.com
 Philippe De Muyter				phdm@macqel.be
@@ -553,6 +553,7 @@ Mark Mitchell					mark@codesourcery.com
 Marko Mlinar                                    markom@opencores.org
 Alan Modra					amodra@bigpond.net.au
 Jason Molenda					jmolenda@apple.com
+Chris Moller					cmoller@redhat.com
 Phil Muldoon					pmuldoon@redhat.com
 Pierre Muller					muller@sourceware.org
 Gaius Mulley                                    gaius@glam.ac.uk

gdb/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2009-12-10  Chris Moller  <moller@mollerware.com>
+
+	PR gdb/9399
+	* gdb.cp/virtfunc2.exp: New tests
+	* gdb.cp/virtfunc2.cc: New tests
+	* gdb.cp/Makefile.in: Added tests to EXECUTABLES
+
 2009-12-10  Oza Pawandeep (paawan1982@yahoo.com
 
 	* gdb.reverse/i387-env-reverse.c: New file.

gdb/testsuite/gdb.cp/Makefile.in

@@ -4,7 +4,7 @@ srcdir = @srcdir@
 EXECUTABLES = ambiguous annota2 anon-union cplusfuncs cttiadd \
 	derivation inherit local member-ptr method misc \
         overload ovldbreak ref-typ ref-typ2 templates userdef virtfunc namespace \
-	ref-types ref-params method2 pr9594 gdb2495
+	ref-types ref-params method2 pr9594 gdb2495 virtfunc2
 
 all info install-info dvi install uninstall installcheck check:
 	@echo "Nothing to be done for $@..."

gdb/testsuite/gdb.cp/virtfunc2.cc

@@ -0,0 +1,40 @@
+ /* This test script is part of GDB, the GNU debugger.
+
+   Copyright 2009
+   Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+   */
+
+class interface
+{
+  virtual int do_print3() { return 111111; }
+};
+ 
+class Obj : virtual public interface
+{
+public:
+  virtual int do_print() { return 123456; }
+};
+
+class Obj2 : Obj,  virtual public interface
+{
+  virtual int do_print2() { return 654321; }
+};
+
+int main(int argc, char** argv) {
+  Obj o;
+  Obj2 o2;
+  return 0;	// marker 1
+}

gdb/testsuite/gdb.cp/virtfunc2.exp

@@ -0,0 +1,59 @@
+# Copyright 2009 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file was written by Chris Moller <moller@redhat.com> based on
+# virtfunc.exp
+
+set nl		"\[\r\n\]+"
+
+if { [skip_cplus_tests] } { continue }
+
+load_lib "cp-support.exp"
+
+set testfile "virtfunc2"
+set srcfile ${testfile}.cc
+set binfile ${objdir}/${subdir}/${testfile}
+
+if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {c++ debug}] != "" } {
+     untested virtfunc2.exp
+     return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+if ![runto_main] then {
+    perror "couldn't run to breakpoint"
+    continue
+}
+
+# set a breakpoint at the return stmt
+
+gdb_breakpoint [gdb_get_line_number "marker 1"]
+gdb_continue_to_breakpoint "marker 1"
+
+gdb_test "print o.do_print()"  "\\$\[0-9\]+ = 123456"
+gdb_test "print o.do_print3()"  "\\$\[0-9\]+ = 111111"
+
+gdb_test "print o2.do_print()"  "\\$\[0-9\]+ = 123456"
+gdb_test "print o2.do_print2()"  "\\$\[0-9\]+ = 654321"
+gdb_test "print o2.do_print3()"  "\\$\[0-9\]+ = 111111"
+
+
+gdb_exit
+return 0
+

gdb/valops.c

@@ -232,6 +232,11 @@ value_cast_structs (struct type *type, struct value *v2)
 	       || TYPE_CODE (t2) == TYPE_CODE_UNION)
 	      && !!"Precondition is that value is of STRUCT or UNION kind");
 
+  if (TYPE_NAME (t1) != NULL
+      && TYPE_NAME (t2) != NULL
+      && !strcmp (TYPE_NAME (t1), TYPE_NAME (t2)))
+    return NULL;
+
   /* Upcasting: look in the type of the source to see if it contains the
      type of the target as a superclass.  If so, we'll need to
      offset the pointer rather than just change its type.  */