gdb/testsuite/gdb.dwarf2/dw2-unusual-field-names.exp

   1 # Copyright 2018-2020 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 # Test that GDB can support accesing fields of a structure if the
  17 # fields have non-standard names.  Specifically, if the names are
  18 # reserved C type names like 'double', 'float', 'int', etc.
  19 #
  20 # We don't expect to that such structures should be seen in real C
  21 # code, but in some cases GDB will generate artificial structures, and
  22 # in some cases, these type names are the obvious choice for field
  23 # names.
  24 #
  25 # One specific example is RISC-V, the 64-bit floating point registers
  26 # are represented as a structure with the field names 'float' and
  27 # 'double'.
  28
  29 load_lib dwarf.exp
  30
  31 # This test can only be run on targets which support DWARF-2 and use
  32 # gas.
  33 if {![dwarf2_support]} {
  34     return 0
  35 }
  36
  37 standard_testfile dw2-unusual-field-names.c dw2-unusual-field-names.S
  38 set asm_file [standard_output_file $srcfile2]
  39
  40 # We need to know the size of integer and address types in order to
  41 # write some of the debugging info we'd like to generate.
  42 #
  43 # For that, we ask GDB by debugging our test program.  Any program
  44 # would do, but since we already have one specifically for this
  45 # testcase, might as well use that.
  46 if [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] {
  47     return -1
  48 }
  49 set int_size [get_sizeof "int" -1]
  50
  51 # Rebuild the test binary with the single field within the structure
  52 # renamed to FIELD_NAME, then test that we can access the field
  53 # through '.' and through '->'.
  54 proc run_test { field_name } {
  55     global asm_file testfile srcfile subdir srcdir
  56     global int_size
  57
  58     Dwarf::assemble $asm_file {
  59         global srcdir subdir srcfile
  60         global field_name int_size
  61
  62         cu {} {
  63             DW_TAG_compile_unit {
  64                 {DW_AT_language @DW_LANG_C}
  65                 {DW_AT_name     dw2-unusual-field-names.c}
  66                 {DW_AT_comp_dir /tmp}
  67             } {
  68                 declare_labels itype ptype stype
  69
  70                 itype: DW_TAG_base_type {
  71                     {DW_AT_byte_size $int_size DW_FORM_sdata}
  72                     {DW_AT_encoding  @DW_ATE_signed}
  73                     {DW_AT_name int}
  74                 }
  75
  76                 stype: DW_TAG_structure_type {
  77                     {DW_AT_name "foo"}
  78                     {DW_AT_byte_size $int_size DW_FORM_sdata}
  79                 } {
  80                     member {
  81                         {name $field_name}
  82                         {type :$itype}
  83                         {data_member_location 0 data1}
  84                     }
  85                 }
  86
  87                 ptype: DW_TAG_pointer_type {
  88                     {DW_AT_type :$stype}
  89                 }
  90
  91                 DW_TAG_variable {
  92                     {DW_AT_name obj}
  93                     {DW_AT_type :$stype}
  94                     {DW_AT_location {
  95                         DW_OP_addr [gdb_target_symbol obj]
  96                     } SPECIAL_expr}
  97                     {external 1 flag}
  98                 }
  99
 100                 DW_TAG_variable {
 101                     {DW_AT_name ptr}
 102                     {DW_AT_type :$ptype}
 103                     {DW_AT_location {
 104                         DW_OP_addr [gdb_target_symbol ptr]
 105                     } SPECIAL_expr}
 106                     {external 1 flag}
 107                 }
 108             }
 109         }
 110     }
 111
 112     if { [prepare_for_testing "failed to prepare" ${testfile} \
 113               [list $srcfile $asm_file] {nodebug}] } {
 114         return -1
 115     }
 116
 117     if ![runto_main] {
 118         return -1
 119     }
 120
 121     gdb_test "p obj.$field_name" " = 0" \
 122         "access a field named '$field_name' directly"
 123
 124     gdb_test "p ptr->$field_name" " = 0" \
 125         "access a field named '$field_name' through a pointer"
 126
 127     gdb_exit
 128 }
 129
 130 foreach field_name { double float char byte long int short unsigned signed } {
 131     run_test $field_name
 132 }