| 1 | # Copyright 2016-2017 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 $asm_file { |
| 30 | cu {} { |
| 31 | compile_unit { |
| 32 | {DW_AT_name main.c} |
| 33 | } { |
| 34 | declare_labels int_type_label char_type_label \ |
| 35 | struct_s_label struct_t_label array_a9_label \ |
| 36 | char_ptr_label implicit_a_label stack_b_label |
| 37 | |
| 38 | int_type_label: base_type { |
| 39 | {name "int"} |
| 40 | {encoding @DW_ATE_signed} |
| 41 | {byte_size 4 DW_FORM_sdata} |
| 42 | } |
| 43 | char_type_label: base_type { |
| 44 | {name "char"} |
| 45 | {encoding @DW_ATE_unsigned} |
| 46 | {byte_size 1 DW_FORM_sdata} |
| 47 | } |
| 48 | char_ptr_label: pointer_type { |
| 49 | {type :$char_type_label} |
| 50 | } |
| 51 | |
| 52 | struct_s_label: structure_type { |
| 53 | {name s} |
| 54 | {byte_size 4 DW_FORM_sdata} |
| 55 | } { |
| 56 | member { |
| 57 | {name a} |
| 58 | {type :$int_type_label} |
| 59 | {data_member_location 0 DW_FORM_udata} |
| 60 | {bit_size 8 DW_FORM_udata} |
| 61 | } |
| 62 | member { |
| 63 | {name b} |
| 64 | {type :$int_type_label} |
| 65 | {data_bit_offset 8 DW_FORM_udata} |
| 66 | {bit_size 24 DW_FORM_udata} |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | struct_t_label: structure_type { |
| 71 | {name t} |
| 72 | {byte_size 4 DW_FORM_sdata} |
| 73 | } { |
| 74 | member { |
| 75 | {name a} |
| 76 | {type :$int_type_label} |
| 77 | {data_member_location 0 DW_FORM_udata} |
| 78 | {bit_size 9 DW_FORM_udata} |
| 79 | } |
| 80 | member { |
| 81 | {name b} |
| 82 | {type :$int_type_label} |
| 83 | {data_bit_offset 9 DW_FORM_udata} |
| 84 | {bit_size 23 DW_FORM_udata} |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | array_a9_label: array_type { |
| 89 | {type :$char_type_label} |
| 90 | } { |
| 91 | subrange_type { |
| 92 | {type :$int_type_label} |
| 93 | {upper_bound 8 DW_FORM_udata} |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | DW_TAG_subprogram { |
| 98 | {name main} |
| 99 | {DW_AT_external 1 flag} |
| 100 | {low_pc [gdb_target_symbol main] DW_FORM_addr} |
| 101 | {high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr} |
| 102 | } { |
| 103 | # Simple variable without location. |
| 104 | DW_TAG_variable { |
| 105 | {name undef_int} |
| 106 | {type :$int_type_label} |
| 107 | } |
| 108 | # Struct variable without location. |
| 109 | DW_TAG_variable { |
| 110 | {name undef_s} |
| 111 | {type :$struct_s_label} |
| 112 | } |
| 113 | # Composite location: byte-aligned pieces. |
| 114 | DW_TAG_variable { |
| 115 | {name def_s} |
| 116 | {type :$struct_s_label} |
| 117 | {location { |
| 118 | const1u 0 |
| 119 | stack_value |
| 120 | bit_piece 8 0 |
| 121 | const1s -1 |
| 122 | stack_value |
| 123 | bit_piece 24 0 |
| 124 | } SPECIAL_expr} |
| 125 | } |
| 126 | # Composite location: non-byte-aligned pieces. |
| 127 | DW_TAG_variable { |
| 128 | {name def_t} |
| 129 | {type :$struct_t_label} |
| 130 | {location { |
| 131 | const2s -184 |
| 132 | stack_value |
| 133 | bit_piece 9 0 |
| 134 | const4u 1752286 |
| 135 | stack_value |
| 136 | bit_piece 23 0 |
| 137 | } SPECIAL_expr} |
| 138 | } |
| 139 | # Composite location with some empty pieces. |
| 140 | DW_TAG_variable { |
| 141 | {name part_def_a} |
| 142 | {type :$array_a9_label} |
| 143 | {location { |
| 144 | piece 3 |
| 145 | const4u 0xf1927314 |
| 146 | stack_value |
| 147 | piece 4 |
| 148 | piece 2 |
| 149 | } SPECIAL_expr} |
| 150 | } |
| 151 | # Implicit location: immediate value. |
| 152 | DW_TAG_variable { |
| 153 | {name def_implicit_s} |
| 154 | {type :$struct_s_label} |
| 155 | {location { |
| 156 | implicit_value 0x12 0x34 0x56 0x78 |
| 157 | } SPECIAL_expr} |
| 158 | } |
| 159 | # Implicit location: immediate value for whole array, with |
| 160 | # excess bytes. |
| 161 | implicit_a_label: DW_TAG_variable { |
| 162 | {name def_implicit_a} |
| 163 | {type :$array_a9_label} |
| 164 | {location { |
| 165 | implicit_value 0x1 0x12 0x23 0x34 0x45 \ |
| 166 | 0x56 0x67 0x78 0x89 0x9a 0xab |
| 167 | } SPECIAL_expr} |
| 168 | } |
| 169 | # Implicit pointer into immediate value. |
| 170 | DW_TAG_variable { |
| 171 | {name implicit_a_ptr} |
| 172 | {type :$char_ptr_label} |
| 173 | {location { |
| 174 | implicit_pointer $implicit_a_label 5 |
| 175 | } SPECIAL_expr} |
| 176 | } |
| 177 | # Stack-value location. |
| 178 | stack_b_label: DW_TAG_variable { |
| 179 | {name def_stack_b} |
| 180 | {type :$struct_t_label} |
| 181 | {location { |
| 182 | const4u 0x1a2b3c4d |
| 183 | stack_value |
| 184 | } SPECIAL_expr} |
| 185 | } |
| 186 | # Implicit pointer into stack value. |
| 187 | DW_TAG_variable { |
| 188 | {name implicit_b_ptr} |
| 189 | {type :$char_ptr_label} |
| 190 | {location { |
| 191 | implicit_pointer $stack_b_label 1 |
| 192 | } SPECIAL_expr} |
| 193 | } |
| 194 | } |
| 195 | } |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | if { [prepare_for_testing "failed to prepare" ${testfile} \ |
| 200 | [list $srcfile $asm_file] {nodebug}] } { |
| 201 | return -1 |
| 202 | } |
| 203 | |
| 204 | if ![runto_main] { |
| 205 | return -1 |
| 206 | } |
| 207 | |
| 208 | # Determine byte order. |
| 209 | set endian [get_endianness] |
| 210 | |
| 211 | # Byte-aligned objects with simple location descriptions. |
| 212 | switch $endian { big {set val 0x345678} little {set val 0x785634} } |
| 213 | gdb_test "print/x def_implicit_s" " = \\{a = 0x12, b = $val\\}" |
| 214 | gdb_test "print/x def_implicit_s.b" " = $val" |
| 215 | gdb_test "print/x def_implicit_a" \ |
| 216 | " = \\{0x1, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89\\}" |
| 217 | gdb_test "print/x def_implicit_a\[5\]" " = 0x56" |
| 218 | gdb_test "print/x *(char (*)\[5\]) implicit_a_ptr" \ |
| 219 | " = \\{0x56, 0x67, 0x78, 0x89, 0x9a\\}" |
| 220 | switch $endian { |
| 221 | big {set val "a = 52, b = 2833485"} |
| 222 | little {set val "a = 77, b = 857502"} |
| 223 | } |
| 224 | gdb_test "print def_stack_b" " = \\{$val\\}" |
| 225 | switch $endian {big {set val 0x2b} little {set val 0x3c}} |
| 226 | gdb_test "print/x *implicit_b_ptr" " = $val" |
| 227 | |
| 228 | # Byte-aligned fields, pieced together from DWARF stack values. |
| 229 | gdb_test "print def_s" " = \\{a = 0, b = -1\\}" |
| 230 | switch $endian { big {set val 0x92} little {set val 0x73} } |
| 231 | gdb_test "print/x part_def_a\[4\]" " = $val" |
| 232 | gdb_test "print/x part_def_a\[8\]" " = <optimized out>" |
| 233 | |
| 234 | # Non-byte-aligned fields, pieced together from DWARF stack values. |
| 235 | gdb_test "print def_t" " = \\{a = -184, b = 1752286\\}" |
| 236 | |
| 237 | # Simple variable without location. |
| 238 | gdb_test "print undef_int" " = <optimized out>" |
| 239 | |
| 240 | # Member of a structure without location. |
| 241 | gdb_test "print undef_s.a" " = <optimized out>" |