gdb/testsuite/gdb.dwarf2/variant.exp

   1 # Copyright 2018-2022 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 DW_TAG_variant_part and DW_TAG_variant.
  17
  18 load_lib dwarf.exp
  19
  20 # This test can only be run on targets which support DWARF-2 and use
  21 # gas.
  22 if {![dwarf2_support]} {
  23     return 0
  24 }
  25
  26 standard_testfile .c .S
  27
  28 # Make some DWARF for the test.
  29 set asm_file [standard_output_file $srcfile2]
  30 Dwarf::assemble $asm_file {
  31     upvar cu_lang cu_lang
  32
  33     declare_labels uinteger_label float_label int8_label
  34     declare_labels discr_1_label discr_2_label discr_3_label
  35     declare_labels one_label two_label
  36
  37     # Creating a CU with 4-byte addresses lets this test link on
  38     # both 32- and 64-bit machines.
  39     cu { addr_size 4 } {
  40         compile_unit {
  41             {name file1.txt}
  42             {language @DW_LANG_Rust}
  43         } {
  44             uinteger_label: DW_TAG_base_type {
  45                 {DW_AT_byte_size 4 DW_FORM_sdata}
  46                 {DW_AT_encoding  @DW_ATE_unsigned}
  47                 {DW_AT_name      {unsigned integer}}
  48             }
  49
  50             int8_label: DW_TAG_base_type {
  51                 {DW_AT_byte_size 1 DW_FORM_sdata}
  52                 {DW_AT_encoding  @DW_ATE_signed}
  53                 {DW_AT_name      i8}
  54             }
  55
  56             float_label: base_type {
  57                 {name float}
  58                 {encoding @DW_ATE_float}
  59                 {byte_size 4 DW_FORM_sdata}
  60             }
  61
  62             one_label: structure_type {
  63                 {name One}
  64                 {byte_size 4 DW_FORM_sdata}
  65             } {
  66                 member {
  67                     {name __0}
  68                     {type :$uinteger_label}
  69                     {data_member_location 0 data1}
  70                 }
  71             }
  72
  73             two_label: structure_type {
  74                 {name Two}
  75                 {byte_size 4 DW_FORM_sdata}
  76             } {
  77                 member {
  78                     {name __0}
  79                     {type :$float_label}
  80                     {data_member_location 0 data1}
  81                 }
  82             }
  83
  84             structure_type {
  85                 {name Simple}
  86                 {byte_size 8 DW_FORM_sdata}
  87             } {
  88                 variant_part {
  89                     {discr :$discr_1_label DW_FORM_ref4}
  90                 } {
  91                     discr_1_label: member {
  92                         {type :$uinteger_label}
  93                         {data_member_location 0 data1}
  94                         {artificial 1 DW_FORM_flag_present}
  95                     }
  96
  97                     variant {
  98                         {discr_value 23 udata}
  99                     } {
 100                         member {
 101                             {type :$one_label}
 102                             {data_member_location 4 data1}
 103                         }
 104                     }
 105
 106                     variant {
 107                         {discr_value 1 udata}
 108                     } {
 109                         member {
 110                             {type :$two_label}
 111                             {data_member_location 4 data1}
 112                         }
 113                     }
 114                 }
 115             }
 116
 117             structure_type {
 118                 {name Defaulted}
 119                 {byte_size 8 DW_FORM_sdata}
 120             } {
 121                 variant_part {
 122                     {discr :$discr_2_label DW_FORM_ref4}
 123                 } {
 124                     discr_2_label: member {
 125                         {type :$uinteger_label}
 126                         {data_member_location 0 data1}
 127                         {artificial 1 DW_FORM_flag_present}
 128                     }
 129
 130                     variant {
 131                     } {
 132                         member {
 133                             {type :$one_label}
 134                             {data_member_location 4 data1}
 135                         }
 136                     }
 137
 138                     variant {
 139                         {discr_value 1 udata}
 140                     } {
 141                         member {
 142                             {type :$two_label}
 143                             {data_member_location 4 data1}
 144                         }
 145                     }
 146                 }
 147             }
 148
 149             structure_type {
 150                 {name Univariant}
 151                 {byte_size 8 DW_FORM_sdata}
 152             } {
 153                 variant_part {
 154                 } {
 155                     variant {
 156                     } {
 157                         member {
 158                             {type :$one_label}
 159                             {data_member_location 4 data1}
 160                         }
 161                     }
 162                 }
 163             }
 164
 165             # Rust won't emit a negative discriminant like this, but
 166             # we want to test the code path anyway.
 167             structure_type {
 168                 {name Negative}
 169                 {byte_size 8 DW_FORM_sdata}
 170             } {
 171                 variant_part {
 172                     {discr :$discr_3_label DW_FORM_ref4}
 173                 } {
 174                     discr_3_label: member {
 175                         {type :$int8_label}
 176                         {data_member_location 0 data1}
 177                         {artificial 1 DW_FORM_flag_present}
 178                     }
 179
 180                     variant {
 181                         {discr_value -1 sdata}
 182                     } {
 183                         member {
 184                             {type :$one_label}
 185                             {data_member_location 4 data1}
 186                         }
 187                     }
 188
 189                     # Make this the default value so we'll see an
 190                     # incorrect result if we mishandle signed
 191                     # discriminants.
 192                     variant {
 193                     } {
 194                         member {
 195                             {type :$two_label}
 196                             {data_member_location 4 data1}
 197                         }
 198                     }
 199                 }
 200             }
 201         }
 202     }
 203 }
 204
 205 if { [prepare_for_testing "failed to prepare" ${testfile} \
 206           [list $srcfile $asm_file] debug] } {
 207     return -1
 208 }
 209
 210 if ![runto func] {
 211     return -1
 212 }
 213
 214 # Get the values into history so we can use it from Rust.
 215 gdb_test "print (void *) buffer" "\\\$1 = .void .. $hex .buffer."
 216 gdb_test "print (void *) buffer2" "\\\$2 = .void .. $hex .buffer2."
 217
 218 gdb_test "set language rust"
 219 gdb_test "print *(\$1 as *mut Simple)" " = One\\(23\\)" \
 220     "print as Simple"
 221 gdb_test "print *(\$1 as *mut Defaulted)" " = One\\(23\\)" \
 222     "print as Defaulted"
 223 gdb_test "print *(\$1 as *mut Univariant)" " = One\\(23\\)" \
 224     "print as Univariant"
 225
 226 gdb_test "print *(\$2 as *mut Negative)" " = One\\(23\\)" \
 227     "print as Negative"