gdb/testsuite/gdb.dwarf2/cpp-linkage-name.exp

   1 # Copyright 2020-2023 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 # Some compilers give anonymous structures a linkage name, and that
  17 # linkage name doesn't demangle (within GDB calling gdb_demangle
  18 # return NULL).  At one point this caused GDB to crash due to
  19 # dereferencing a NULL pointer.
  20
  21 load_lib dwarf.exp
  22
  23 # This test can only be run on targets which support DWARF-2 and use gas.
  24 if {![dwarf2_support]} {
  25     return 0
  26 }
  27
  28 standard_testfile .c -debug.S
  29
  30 # Set up the DWARF for the test.
  31 set asm_file [standard_output_file $srcfile2]
  32 Dwarf::assemble $asm_file {
  33     global srcfile
  34
  35     cu {} {
  36         DW_TAG_compile_unit {
  37             {DW_AT_language @DW_LANG_C_plus_plus}
  38             {DW_AT_name     $srcfile}
  39             {DW_AT_comp_dir /tmp}
  40
  41         } {
  42             declare_labels a_l b_l
  43
  44             a_l: DW_TAG_base_type {
  45                 {DW_AT_byte_size 4 DW_FORM_sdata}
  46                 {DW_AT_encoding  @DW_ATE_signed}
  47                 {DW_AT_name      int}
  48             }
  49
  50             # To expose the bug that existed at one point this
  51             # structure must have a linkage name, but no name, and the
  52             # linkage name is something that doesn't demangle.
  53             b_l: DW_TAG_structure_type {
  54                 {DW_AT_byte_size 8 DW_FORM_sdata}
  55                 {DW_AT_encoding  @DW_ATE_signed}
  56                 {DW_AT_linkage_name <anon>}
  57             } {
  58                 member {
  59                     {name x}
  60                     {type :$a_l}
  61                     {data_member_location 0 data1}
  62                 }
  63                 member {
  64                     {name y}
  65                     {type :$a_l}
  66                     {data_member_location 0 data1}
  67                 }
  68             }
  69             DW_TAG_subprogram {
  70                 {MACRO_AT_func {main}}
  71                 {type :$a_l}
  72             }
  73             DW_TAG_variable {
  74                 {type :$b_l}
  75                 {external 1 flag}
  76                 {DW_AT_name global_var}
  77                 {DW_AT_location {
  78                     DW_OP_addr [gdb_target_symbol global_var]
  79                 } SPECIAL_expr}
  80             }
  81         }
  82     }
  83 }
  84
  85 if { [prepare_for_testing "failed to prepare" ${testfile} \
  86           [list $srcfile $asm_file] {nodebug}] } {
  87     return -1
  88 }
  89
  90 gdb_assert [runto_main] "run to main"
  91 gdb_test "p global_var" " = {x = 0, y = 0}"