gdb/testsuite/gdb.dwarf2/nonvar-access.exp

   1 # Copyright 2016 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 accessing "non-variable" variables, i.e., variables which are
  17 # optimized to a constant DWARF location expression and/or
  18 # partially/fully optimized out.
  19
  20 load_lib dwarf.exp
  21
  22 if {![dwarf2_support]} { return 0 }
  23
  24 standard_testfile main.c nonvar-access-dw.S
  25
  26 # Make some DWARF for the test.
  27 set asm_file [standard_output_file $srcfile2]
  28
  29 Dwarf::assemble $asm_file {
  30     cu {} {
  31         compile_unit {
  32             {DW_AT_name main.c}
  33         } {
  34             declare_labels int_type_label short_type_label
  35             declare_labels struct_s_label struct_t_label
  36
  37             int_type_label: base_type {
  38                 {name "int"}
  39                 {encoding @DW_ATE_signed}
  40                 {byte_size 4 DW_FORM_sdata}
  41             }
  42
  43             struct_s_label: structure_type {
  44                 {name s}
  45                 {byte_size 4 DW_FORM_sdata}
  46             } {
  47                 member {
  48                     {name a}
  49                     {type :$int_type_label}
  50                     {data_member_location 0 DW_FORM_udata}
  51                     {bit_size 8 DW_FORM_udata}
  52                 }
  53                 member {
  54                     {name b}
  55                     {type :$int_type_label}
  56                     {data_bit_offset 8 DW_FORM_udata}
  57                     {bit_size 24 DW_FORM_udata}
  58                 }
  59             }
  60
  61             struct_t_label: structure_type {
  62                 {name t}
  63                 {byte_size 4 DW_FORM_sdata}
  64             } {
  65                 member {
  66                     {name a}
  67                     {type :$int_type_label}
  68                     {data_member_location 0 DW_FORM_udata}
  69                     {bit_size 9 DW_FORM_udata}
  70                 }
  71                 member {
  72                     {name b}
  73                     {type :$int_type_label}
  74                     {data_bit_offset 9 DW_FORM_udata}
  75                     {bit_size 23 DW_FORM_udata}
  76                 }
  77             }
  78
  79             DW_TAG_subprogram {
  80                 {name main}
  81                 {DW_AT_external 1 flag}
  82                 {low_pc [gdb_target_symbol main] DW_FORM_addr}
  83                 {high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
  84             } {
  85                 DW_TAG_variable {
  86                     {name undef_int}
  87                     {type :$int_type_label}
  88                 }
  89                 DW_TAG_variable {
  90                     {name undef_s}
  91                     {type :$struct_s_label}
  92                 }
  93                 DW_TAG_variable {
  94                     {name def_s}
  95                     {type :$struct_s_label}
  96                     {location {
  97                         const1u 0
  98                         stack_value
  99                         bit_piece 8 0
 100                         const1s -1
 101                         stack_value
 102                         bit_piece 24 0
 103                     } SPECIAL_expr}
 104                 }
 105                 DW_TAG_variable {
 106                     {name def_t}
 107                     {type :$struct_t_label}
 108                     {location {
 109                         const1u 0
 110                         stack_value
 111                         bit_piece 9 0
 112                         const1s -1
 113                         stack_value
 114                         bit_piece 23 0
 115                     } SPECIAL_expr}
 116                 }
 117             }
 118         }
 119     }
 120 }
 121
 122 if { [prepare_for_testing "failed to prepare" ${testfile} \
 123           [list $srcfile $asm_file] {nodebug}] } {
 124     return -1
 125 }
 126
 127 if ![runto_main] {
 128     return -1
 129 }
 130
 131 gdb_test "print def_s" " = \\{a = 0, b = -1\\}"
 132 gdb_test "print def_t" " = \\{a = 0, b = -1\\}"
 133 gdb_test "print undef_int" " = <optimized out>"
 134 gdb_test "print undef_s.a" " = <optimized out>"