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https://sourceware.org/ml/gdb-patches/2013-07/msg00469.html
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Hi.
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This patch adds the missing calls to check_typedef
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and adds a testcase to show the issue.
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The PR is not closeable yet, but the remaining issues are more cleanups
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than actual bug fixes.
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Regression tested on amd64-linux.
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I will check this in in a few days if there are no objections.
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[The multiple calls to check_typedef (value_type (*argp)) are
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bothersome, but the code is simpler this way, and I expect
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resolving the rest of the issues in 15695 to potentially change this
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code significantly.]
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---
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commit cbb25189b69e501ddca64917d810b54bb1466c93
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Author: Doug Evans <dje@google.com>
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Date: Thu Aug 1 23:59:47 2013 +0000
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PR symtab/15695
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* valops.c (value_struct_elt): Add missing call to check_typedef.
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(value_find_oload_method_list): Ditto.
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testsuite/
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* gdb.base/func-ptr.exp: New file.
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* gdb.base/func-ptr.c: New file.
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2013-08-01 Doug Evans <dje@google.com>
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PR symtab/15695
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* valops.c (value_struct_elt): Add missing call to check_typedef.
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(value_find_oload_method_list): Ditto.
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2013-08-01 Doug Evans <dje@google.com>
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PR symtab/15695
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* gdb.base/func-ptr.exp: New file.
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* gdb.base/func-ptr.c: New file.
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Index: gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.c
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===================================================================
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--- /dev/null
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+++ gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.c
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@@ -0,0 +1,30 @@
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+/* This testcase is part of GDB, the GNU debugger.
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+
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+ Copyright 2013 Free Software Foundation, Inc.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 3 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
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+
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+void
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+bar ()
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+{
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+}
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+
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+typedef void foo (void);
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+foo *pbar = bar;
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+
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+int
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+main ()
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+{
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+ return 0;
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+}
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Index: gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.exp
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===================================================================
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--- /dev/null
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+++ gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.exp
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@@ -0,0 +1,30 @@
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+# Copyright 2013 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+# This testcase exercises bug 15695.
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+# Trying to print foo->bar if foo is a pointer to a typedef of a pointer
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+# to a function will put gdb into an infinite loop.
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+
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+if { [prepare_for_testing func-ptr.exp "func-ptr" {func-ptr.c} {debug}] } {
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+ return -1
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+}
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+
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+if ![runto_main] {
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+ fail "Can't run to main"
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+ return 0
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+}
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+
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+# This would put gdb into an infinite loop.
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+gdb_test "print pbar->baz" "Attempt to extract .*"
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Index: gdb-7.6.1/gdb/valops.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/valops.c
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+++ gdb-7.6.1/gdb/valops.c
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@@ -2450,7 +2450,7 @@ value_struct_elt (struct value **argp, s
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{
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*argp = value_ind (*argp);
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/* Don't coerce fn pointer to fn and then back again! */
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- if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
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+ if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
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*argp = coerce_array (*argp);
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t = check_typedef (value_type (*argp));
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}
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@@ -2614,7 +2614,7 @@ value_find_oload_method_list (struct val
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{
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*argp = value_ind (*argp);
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/* Don't coerce fn pointer to fn and then back again! */
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- if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
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+ if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
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*argp = coerce_array (*argp);
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t = check_typedef (value_type (*argp));
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}
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