gdb/testsuite/gdb.dwarf2/negative-data-member-location.exp

   1 # Copyright 2021-2024 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # Test our workaround for a GCC 11 bug, where it sometimes puts a -1 value for
  17 # DW_AT_data_member_location:
  18 #
  19 #   Negative DW_AT_data_member_location
  20 #   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101378
  21
  22 load_lib dwarf.exp
  23
  24 # This test can only be run on targets which support DWARF-2 and use gas.
  25 require dwarf2_support
  26
  27 standard_testfile .c -dw.S
  28
  29 set asm_file [standard_output_file ${srcfile2}]
  30
  31 Dwarf::assemble ${asm_file} {
  32     cu {} {
  33         DW_TAG_compile_unit {
  34             {DW_AT_language @DW_LANG_C99}
  35             {DW_AT_producer "GNU C++17 11.1.0 -mtune=generic -march=x86-64 -g3 -O0"}
  36             {name ${::srcfile}}
  37         } {
  38             declare_labels int_label struct_label
  39
  40             int_label: DW_TAG_base_type {
  41                 {DW_AT_byte_size 4 DW_FORM_udata}
  42                 {DW_AT_encoding @DW_ATE_signed}
  43                 {DW_AT_name "int"}
  44             }
  45
  46             struct_label: DW_TAG_structure_type {
  47                 {DW_AT_name "the_struct"}
  48                 {DW_AT_byte_size 4 DW_FORM_udata}
  49             } {
  50                 DW_TAG_member {
  51                     {DW_AT_name "field"}
  52                     {DW_AT_type :$int_label}
  53                     {DW_AT_data_member_location -1 DW_FORM_sdata}
  54                 }
  55             }
  56
  57             DW_TAG_variable {
  58                 {DW_AT_name "s"}
  59                 {DW_AT_type :$struct_label}
  60                 {DW_AT_location {DW_OP_addr [gdb_target_symbol "s"]} SPECIAL_expr}
  61             }
  62         }
  63     }
  64 }
  65
  66 if { [prepare_for_testing "failed to prepare" ${testfile} [list $srcfile $asm_file] {nodebug}] } {
  67     return
  68 }
  69
  70 if { ![runto_main] } {
  71     return
  72 }
  73
  74 gdb_test "print /x s" " = {field = 0x11222211}"
  75 gdb_test "print /x s.field" " = 0x11222211"