From 5b151607e1faf27238e9dce6d3124741779dcc3a Mon Sep 17 00:00:00 2001 From: Tom de Vries Date: Thu, 28 Oct 2021 10:43:34 +0200 Subject: [gdb/symtab] Handle DW_AT_string_length with location list Consider a fortran routine where a string variable s is modified: ... subroutine f(s) character*(*) s print *, s s(1:3) = 'oof' print *, s end subroutine f ... When compiling with optimization level -O1 and printing the type of variable s we get: ... $ gdb -q -batch outputs/gdb.opt/fortran-string/fortran-string \ -ex "b f" \ -ex run \ -ex "ptype s" Breakpoint 1 at 0x4006f7: file fortran-string.f90, line 21. Breakpoint 1, f (s=..., _s=_s@entry=3) at fortran-string.f90:21 21 subroutine f(s) type = character*1 ... while with -O0 we have instead: ... type = character (3) ... The problem is that the type of s is: ... <1><2d6>: Abbrev Number: 21 (DW_TAG_string_type) <2d7> DW_AT_string_length: 0xbf (location list) <2db> DW_AT_byte_size : 4 ... where the DW_AT_string_length is a location list, a case that is not handled by attr_to_dynamic_prop. Fix this by handling attr->form_is_section_offset () in attr_to_dynamic_prop. Tested on x86_64-linux. The test-case is based on gdb.opt/fortran-string.exp from https://src.fedoraproject.org/rpms/gdb/raw/f32/f/gdb-archer-vla-tests.patch . I've updated the copyrights to stretch to 2021. [ I've tried to create a dwarf assembly test-case for this, but didn't manage. ] Co-Authored-By: Jan Kratochvil Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26910 --- gdb/testsuite/gdb.opt/fortran-string.f90 | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 gdb/testsuite/gdb.opt/fortran-string.f90 (limited to 'gdb/testsuite/gdb.opt/fortran-string.f90') diff --git a/gdb/testsuite/gdb.opt/fortran-string.f90 b/gdb/testsuite/gdb.opt/fortran-string.f90 new file mode 100644 index 0000000..71b6bae --- /dev/null +++ b/gdb/testsuite/gdb.opt/fortran-string.f90 @@ -0,0 +1,27 @@ +! Copyright 2009-2021 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 . + +subroutine f(s) + character*(*) s + print *, s + s(1:3) = 'oof' + print *, s +end subroutine f + +program main + character*3 s; + s = 'foo' + call f (s) +end program main -- cgit v1.1