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* [binutils-gdb] [gdb/symtab] Handle named DW_TAG_unspecified_type DIE
@ 2022-09-16 15:14 Tom de Vries
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From: Tom de Vries @ 2022-09-16 15:14 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=80eaec735e36598a312f9b184ee4f32bd6c0bab4
commit 80eaec735e36598a312f9b184ee4f32bd6c0bab4
Author: Tom de Vries <tdevries@suse.de>
Date: Fri Sep 16 17:14:34 2022 +0200
[gdb/symtab] Handle named DW_TAG_unspecified_type DIE
With the test-case included in the patch, we run into:
...
(gdb) info types -q std::nullptr_t^M
During symbol reading: unsupported tag: 'DW_TAG_unspecified_type'^M
^M
File /usr/include/c++/7/x86_64-suse-linux/bits/c++config.h:^M
2198: typedef decltype(nullptr) std::nullptr_t;^M
(gdb) FAIL: gdb.dwarf2/nullptr_t.exp: info types -q std::nullptr_t \
without complaint
...
Fix the complaint by handling DW_TAG_unspecified_type in new_symbol, and verify
in the test-case using "maint print symbols" that the symbol exists.
Tested on x86_64-linux, with gcc 7.5.0 and clang 13.0.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=17271
Diff:
---
gdb/dwarf2/read.c | 1 +
gdb/testsuite/gdb.dwarf2/nullptr_t.cc | 29 +++++++++++++++++++++++++
gdb/testsuite/gdb.dwarf2/nullptr_t.exp | 39 ++++++++++++++++++++++++++++++++++
3 files changed, 69 insertions(+)
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 29ccd00a1da..0a3c29212b4 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -21066,6 +21066,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
case DW_TAG_base_type:
case DW_TAG_subrange_type:
case DW_TAG_generic_subrange:
+ case DW_TAG_unspecified_type:
sym->set_aclass_index (LOC_TYPEDEF);
sym->set_domain (VAR_DOMAIN);
list_to_add = cu->list_in_scope;
diff --git a/gdb/testsuite/gdb.dwarf2/nullptr_t.cc b/gdb/testsuite/gdb.dwarf2/nullptr_t.cc
new file mode 100644
index 00000000000..85fe801e193
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/nullptr_t.cc
@@ -0,0 +1,29 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2022 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/>. */
+
+#include <cstddef>
+
+void
+foo (std::nullptr_t)
+{
+}
+
+int
+main (void)
+{
+ foo (nullptr);
+}
diff --git a/gdb/testsuite/gdb.dwarf2/nullptr_t.exp b/gdb/testsuite/gdb.dwarf2/nullptr_t.exp
new file mode 100644
index 00000000000..c597c660a36
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/nullptr_t.exp
@@ -0,0 +1,39 @@
+# Copyright 2022 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/>.
+
+if {[skip_cplus_tests]} { continue }
+
+standard_testfile .cc
+
+if [prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}] {
+ return -1
+}
+
+set cmd "info types -q std::nullptr_t"
+
+set re \
+ [multi_line \
+ "$cmd" \
+ "" \
+ "File .*:" \
+ "$decimal:\ttypedef decltype\\(nullptr\\) std::nullptr_t;"]
+
+with_complaints 5 {
+ gdb_test $cmd $re "$cmd without complaints"
+}
+
+gdb_test "maint print symbols -source $srcfile" \
+ "typedef void decltype\\(nullptr\\); \r\n.*" \
+ "decltype(nullptr) symbol"
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