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

   1 # Copyright 2020 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 cpp-linkage-name.c cpp-linkage-name-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 srcdir subdir srcfile
  34
  35     lassign [function_range main ${srcdir}/${subdir}/${srcfile}] \
  36         main_start main_length
  37
  38     cu {} {
  39         DW_TAG_compile_unit {
  40             {DW_AT_language @DW_LANG_C_plus_plus}
  41             {DW_AT_name     ada-linkage-name.c}
  42             {DW_AT_comp_dir /tmp}
  43
  44         } {
  45             declare_labels a_l b_l
  46
  47             a_l: DW_TAG_base_type {
  48                 {DW_AT_byte_size 4 DW_FORM_sdata}
  49                 {DW_AT_encoding  @DW_ATE_signed}
  50                 {DW_AT_name      int}
  51             }
  52
  53             # To expose the bug that existed at one point this
  54             # structure must have a linkage name, but no name, and the
  55             # linkage name is something that doesn't demangle.
  56             b_l: DW_TAG_structure_type {
  57                 {DW_AT_byte_size 8 DW_FORM_sdata}
  58                 {DW_AT_encoding  @DW_ATE_signed}
  59                 {DW_AT_linkage_name <anon>}
  60             } {
  61                 member {
  62                     {name x}
  63                     {type :$a_l}
  64                     {data_member_location 0 data1}
  65                 }
  66                 member {
  67                     {name y}
  68                     {type :$a_l}
  69                     {data_member_location 0 data1}
  70                 }
  71             }
  72             DW_TAG_subprogram {
  73                 {name "main"}
  74                 {low_pc $main_start addr}
  75                 {high_pc "$main_start + $main_length" addr}
  76                 {type :$a_l}
  77             }
  78             DW_TAG_variable {
  79                 {type :$b_l}
  80                 {external 1 flag}
  81                 {DW_AT_name global_var}
  82                 {DW_AT_location {
  83                     DW_OP_addr [gdb_target_symbol global_var]
  84                 } SPECIAL_expr}
  85             }
  86         }
  87     }
  88 }
  89
  90 if { [prepare_for_testing "failed to prepare" ${testfile} \
  91           [list $srcfile $asm_file] {nodebug}] } {
  92     return -1
  93 }
  94
  95 gdb_assert [runto_main] "run to main"
  96 gdb_test "p global_var" " = {x = 0, y = 0}"