* [PATCH] Avoid crash with Ada and -fdata-sections
@ 2023-08-23 15:08 Tom Tromey
2023-09-05 15:48 ` Tom Tromey
0 siblings, 1 reply; 2+ messages in thread
From: Tom Tromey @ 2023-08-23 15:08 UTC (permalink / raw)
To: gdb-patches; +Cc: Tom Tromey
A user noticed that gdb would crash when showing a backtrace.
Investigation showed this to be a crash in the DWARF reader when
handling a "pragma export" symbol. The bug here is that earlier code
decides to eliminate the symbol, but the export code tries to add it
anyway -- but to a NULL list.
---
gdb/dwarf2/read.c | 3 +-
gdb/testsuite/gdb.ada/data-sections.exp | 34 ++++++++++++++++++++
gdb/testsuite/gdb.ada/data-sections/main.adb | 19 +++++++++++
3 files changed, 55 insertions(+), 1 deletion(-)
create mode 100644 gdb/testsuite/gdb.ada/data-sections.exp
create mode 100644 gdb/testsuite/gdb.ada/data-sections/main.adb
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index eb4cb9ba72e..a46b9b62a37 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -19224,7 +19224,8 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
else
list_to_add = cu->list_in_scope;
- if (is_ada_import_or_export (cu, name, linkagename))
+ if (list_to_add != nullptr
+ && is_ada_import_or_export (cu, name, linkagename))
{
/* This is a Pragma Export. A Pragma Import won't
be seen here, because it will not have a location
diff --git a/gdb/testsuite/gdb.ada/data-sections.exp b/gdb/testsuite/gdb.ada/data-sections.exp
new file mode 100644
index 00000000000..9cc6023686b
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/data-sections.exp
@@ -0,0 +1,34 @@
+# Copyright 2023 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/>.
+
+load_lib "ada.exp"
+
+require allow_ada_tests
+
+standard_ada_testfile main
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable \
+ {debug additional_flags=-fdata-sections ldflags=-Wl,--gc-sections}] \
+ != ""} {
+ return -1
+}
+
+# The bug was that the DWARF reader would crash when processing a
+# certain symbol.
+save_vars {GDBFLAGS} {
+ append GDBFLAGS " --readnow"
+
+ clean_restart ${testfile}
+}
diff --git a/gdb/testsuite/gdb.ada/data-sections/main.adb b/gdb/testsuite/gdb.ada/data-sections/main.adb
new file mode 100644
index 00000000000..a4ca8b6fb57
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/data-sections/main.adb
@@ -0,0 +1,19 @@
+-- Copyright 2023 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/>.
+
+procedure Main is
+begin
+ null;
+end Main;
--
2.40.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] Avoid crash with Ada and -fdata-sections
2023-08-23 15:08 [PATCH] Avoid crash with Ada and -fdata-sections Tom Tromey
@ 2023-09-05 15:48 ` Tom Tromey
0 siblings, 0 replies; 2+ messages in thread
From: Tom Tromey @ 2023-09-05 15:48 UTC (permalink / raw)
To: Tom Tromey via Gdb-patches; +Cc: Tom Tromey
>>>>> "Tom" == Tom Tromey via Gdb-patches <gdb-patches@sourceware.org> writes:
Tom> A user noticed that gdb would crash when showing a backtrace.
Tom> Investigation showed this to be a crash in the DWARF reader when
Tom> handling a "pragma export" symbol. The bug here is that earlier code
Tom> decides to eliminate the symbol, but the export code tries to add it
Tom> anyway -- but to a NULL list.
I'm checking this in.
Tom
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-09-05 15:48 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-08-23 15:08 [PATCH] Avoid crash with Ada and -fdata-sections Tom Tromey
2023-09-05 15:48 ` Tom Tromey
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).