Go to file
Tom de Vries 5b151607e1 [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 <jan.kratochvil@redhat.com>

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26910
2021-10-28 10:43:34 +02:00
bfd asan: mmo: NULL dereferenc in mmo_xore_32 2021-10-28 13:25:57 +10:30
binutils binutils, ld: make objdump --ctf's parameter optional 2021-10-25 11:17:03 +01:00
config Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
contrib
cpu Re: opcodes: constify & local meps macros 2021-07-05 21:40:49 +09:30
elfcpp PATCH [4/4] arm: Add Tag_PACRET_use build attribute 2021-08-17 14:49:42 +02:00
etc etc: switch to automake 2021-09-09 23:30:12 -04:00
gas RISC-V: Tidy riscv assembler and disassembler. 2021-10-27 21:22:26 +08:00
gdb [gdb/symtab] Handle DW_AT_string_length with location list 2021-10-28 10:43:34 +02:00
gdbserver gdbserver: make target_pid_to_str return std::string 2021-10-25 14:33:55 -04:00
gdbsupport gdbsupport: add assertions in array_view 2021-10-25 14:51:44 -04:00
gnulib gnulib: import various network functions 2021-09-08 17:48:09 -04:00
gold gold: Place .note.gnu.property section before other note sections 2021-10-26 16:24:24 -07:00
gprof configure: regenerate in all projects that use libtool.m4 2021-09-27 20:31:24 +01:00
include LoongArch opcodes support 2021-10-24 21:36:31 +10:30
intl Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
ld ASSERT in empty output section with address 2021-10-28 10:51:03 +10:30
libbacktrace Copy in libbacktrace from gcc 2021-09-28 12:21:21 +01:00
libctf libctf, ld: handle nonrepresentable types better 2021-10-25 11:17:05 +01:00
libdecnumber
libiberty Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
opcodes ubsan: arm: undefined shift 2021-10-28 07:40:49 +10:30
readline
sim sim: add --info-target for listing supported BFD targets 2021-10-04 02:19:58 -04:00
texinfo
zlib configure: regenerate in all projects that use libtool.m4 2021-09-27 20:31:24 +01:00
.cvsignore
.gitattributes
.gitignore
ar-lib
ChangeLog src-release.sh: add libbacktrace to GDB_SUPPORT_DIRS 2021-09-28 12:21:21 +01:00
compile
config-ml.in
config.guess
config.rpath
config.sub
configure top-level configure: setup target_configdirs based on repository 2021-09-28 12:21:21 +01:00
configure.ac top-level configure: setup target_configdirs based on repository 2021-09-28 12:21:21 +01:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4 libtool.m4: fix nm BSD flag detection 2021-09-27 20:31:23 +01:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def gdb: Add a dependency between gdb and libbacktrace 2021-09-28 12:21:21 +01:00
Makefile.in gdb: Add a dependency between gdb and libbacktrace 2021-09-28 12:21:21 +01:00
Makefile.tpl
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am
README
README-maintainer-mode
setup.com
src-release.sh src-release.sh: add libbacktrace to GDB_SUPPORT_DIRS 2021-09-28 12:21:21 +01:00
symlink-tree
test-driver
ylwrap

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.