[patch] PR 15695, add missing check_typedef's

[Doug Evans <dje at google dot com>]

Hi.
This patch adds the missing calls to check_typedef
and adds a testcase to show the issue.

The PR is not closeable yet, but the remaining issues are more cleanups
than actual bug fixes.

Regression tested on amd64-linux.

I will check this in in a few days if there are no objections.

[The multiple calls to check_typedef (value_type (*argp)) are
bothersome, but the code is simpler this way, and I expect
resolving the rest of the issues in 15695 to potentially change this
code significantly.]

2013-07-19  Doug Evans  <dje@google.com>

	PR symtab/15695
	* valops.c (value_struct_elt): Add missing call to check_typedef.
	(value_find_oload_method_list): Ditto.
	* testsuite/gdb.base/func-ptr.exp: New file.
	* testsuite/gdb.base/func-ptr.c: New file.

Index: valops.c
===================================================================
RCS file: /cvs/src/src/gdb/valops.c,v
retrieving revision 1.314
diff -u -p -r1.314 valops.c
--- valops.c	18 Jul 2013 23:09:49 -0000	1.314
+++ valops.c	19 Jul 2013 20:49:26 -0000
@@ -2188,7 +2188,7 @@ value_struct_elt (struct value **argp, s
     {
       *argp = value_ind (*argp);
       /* Don't coerce fn pointer to fn and then back again!  */
-      if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
+      if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
 	*argp = coerce_array (*argp);
       t = check_typedef (value_type (*argp));
     }
@@ -2352,7 +2352,7 @@ value_find_oload_method_list (struct val
     {
       *argp = value_ind (*argp);
       /* Don't coerce fn pointer to fn and then back again!  */
-      if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
+      if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
 	*argp = coerce_array (*argp);
       t = check_typedef (value_type (*argp));
     }
Index: testsuite/gdb.base/func-ptr.c
===================================================================
RCS file: testsuite/gdb.base/func-ptr.c
diff -N testsuite/gdb.base/func-ptr.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ testsuite/gdb.base/func-ptr.c	19 Jul 2013 20:49:26 -0000
@@ -0,0 +1,30 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 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/>.  */
+
+void
+bar ()
+{
+}
+
+typedef void foo (void);
+foo *pbar = bar;
+
+int
+main ()
+{
+  return 0;
+}
Index: testsuite/gdb.base/func-ptr.exp
===================================================================
RCS file: testsuite/gdb.base/func-ptr.exp
diff -N testsuite/gdb.base/func-ptr.exp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ testsuite/gdb.base/func-ptr.exp	19 Jul 2013 20:49:26 -0000
@@ -0,0 +1,30 @@
+# Copyright 2013 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 testcase exercises bug 15695.
+# Trying to print foo->bar if foo is a pointer to a typedef of a pointer
+# to a function will put gdb into an infinite loop.
+
+if { [prepare_for_testing func-ptr.exp "func-ptr" {func-ptr.c} {debug}] } {
+    return -1
+}
+
+if ![runto_main] {
+    fail "Can't run to main"
+    return 0
+}
+
+# This would put gdb into an infinite loop.
+gdb_test "print pbar->baz" "Attempt to extract .*"