1# RUN: llvm-mc -filetype=obj -o %t -triple x86_64-apple-macosx10.15.0 %s 2# RUN: %lldb %t -o "target variable constant" -b | FileCheck %s 3 4# CHECK: (lldb) target variable constant 5# CHECK: (U) constant = { 6# CHECK: raw = 1688469761 7# CHECK: = (a = 1, b = 1, c = 36, d = 2, e = 36, f = 1) 8# CHECK: } 9 10# This is testing when how ValueObjectVariable handles the case where the 11# DWARFExpression holds the data that represents a constant value. 12# Compile at -O1 allows us to capture this case. Below is the code used 13# to generate the assembly: 14# 15# typedef union 16# { 17# unsigned raw; 18# struct 19# { 20# unsigned a : 8; 21# unsigned b : 8; 22# unsigned c : 6; 23# unsigned d : 2; 24# unsigned e : 6; 25# unsigned f : 2; 26# } ; 27# } U; 28# 29# static U __attribute__((used)) _type_anchor; 30# static const int constant = 0x64A40101; 31# 32# int g() { return constant; } 33# 34# int main() { 35# U u; 36# u.raw = 0x64A40101; 37# } 38# 39# Compiled as follows: 40# 41# clang -gdwarf-4 -O1 dw_at_const_value_bug.c -S -o dw_at_const_value_bug.s 42# 43# I was able to obtain a global of type U with DW_AT_const_value but was able 44# to using int. This required modifying the DW_AT_type of constant to be type 45# U. After that stripping as much of the assembly as possible to give us a 46# smaller reproducer. 47 48 49.zerofill __DATA,__bss,__type_anchor,4,2 ## @_type_anchor 50 .no_dead_strip __type_anchor 51 .section __DWARF,__debug_str,regular,debug 52Linfo_string: 53 .zero 90 54 .asciz "constant" ## string offset=90 55 .asciz "int" ## string offset=99 56 .asciz "_type_anchor" ## string offset=103 57 .asciz "U" ## string offset=116 58 .asciz "raw" ## string offset=118 59 .asciz "unsigned int" ## string offset=122 60 .asciz "a" ## string offset=135 61 .asciz "b" ## string offset=137 62 .asciz "c" ## string offset=139 63 .asciz "d" ## string offset=141 64 .asciz "e" ## string offset=143 65 .asciz "f" ## string offset=145 66 .asciz "g" ## string offset=147 67 .asciz "main" ## string offset=149 68 .asciz "u" ## string offset=154 69 .section __DWARF,__debug_abbrev,regular,debug 70Lsection_abbrev: 71 .byte 1 ## Abbreviation Code 72 .byte 17 ## DW_TAG_compile_unit 73 .byte 1 ## DW_CHILDREN_yes 74 .byte 37 ## DW_AT_producer 75 .byte 14 ## DW_FORM_strp 76 .byte 19 ## DW_AT_language 77 .byte 5 ## DW_FORM_data2 78 .byte 3 ## DW_AT_name 79 .byte 14 ## DW_FORM_strp 80 .byte 66 ## DW_AT_stmt_list 81 .byte 23 ## DW_FORM_sec_offset 82 .byte 27 ## DW_AT_comp_dir 83 .byte 14 ## DW_FORM_strp 84 .ascii "\264B" ## DW_AT_GNU_pubnames 85 .byte 25 ## DW_FORM_flag_present 86 .ascii "\341\177" ## DW_AT_APPLE_optimized 87 .byte 25 ## DW_FORM_flag_present 88 .byte 17 ## DW_AT_low_pc 89 .byte 1 ## DW_FORM_addr 90 .byte 18 ## DW_AT_high_pc 91 .byte 6 ## DW_FORM_data4 92 .byte 0 ## EOM(1) 93 .byte 0 ## EOM(2) 94 .byte 2 ## Abbreviation Code 95 .byte 52 ## DW_TAG_variable 96 .byte 0 ## DW_CHILDREN_no 97 .byte 3 ## DW_AT_name 98 .byte 14 ## DW_FORM_strp 99 .byte 73 ## DW_AT_type 100 .byte 19 ## DW_FORM_ref4 101 .byte 58 ## DW_AT_decl_file 102 .byte 11 ## DW_FORM_data1 103 .byte 59 ## DW_AT_decl_line 104 .byte 11 ## DW_FORM_data1 105 .byte 28 ## DW_AT_const_value 106 .byte 15 ## DW_FORM_udata 107 .byte 0 ## EOM(1) 108 .byte 0 ## EOM(2) 109 .byte 3 ## Abbreviation Code 110 .byte 38 ## DW_TAG_const_type 111 .byte 0 ## DW_CHILDREN_no 112 .byte 73 ## DW_AT_type 113 .byte 19 ## DW_FORM_ref4 114 .byte 0 ## EOM(1) 115 .byte 0 ## EOM(2) 116 .byte 4 ## Abbreviation Code 117 .byte 36 ## DW_TAG_base_type 118 .byte 0 ## DW_CHILDREN_no 119 .byte 3 ## DW_AT_name 120 .byte 14 ## DW_FORM_strp 121 .byte 62 ## DW_AT_encoding 122 .byte 11 ## DW_FORM_data1 123 .byte 11 ## DW_AT_byte_size 124 .byte 11 ## DW_FORM_data1 125 .byte 0 ## EOM(1) 126 .byte 0 ## EOM(2) 127 .byte 5 ## Abbreviation Code 128 .byte 52 ## DW_TAG_variable 129 .byte 0 ## DW_CHILDREN_no 130 .byte 3 ## DW_AT_name 131 .byte 14 ## DW_FORM_strp 132 .byte 73 ## DW_AT_type 133 .byte 19 ## DW_FORM_ref4 134 .byte 58 ## DW_AT_decl_file 135 .byte 11 ## DW_FORM_data1 136 .byte 59 ## DW_AT_decl_line 137 .byte 11 ## DW_FORM_data1 138 .byte 2 ## DW_AT_location 139 .byte 24 ## DW_FORM_exprloc 140 .byte 0 ## EOM(1) 141 .byte 0 ## EOM(2) 142 .byte 6 ## Abbreviation Code 143 .byte 22 ## DW_TAG_typedef 144 .byte 0 ## DW_CHILDREN_no 145 .byte 73 ## DW_AT_type 146 .byte 19 ## DW_FORM_ref4 147 .byte 3 ## DW_AT_name 148 .byte 14 ## DW_FORM_strp 149 .byte 58 ## DW_AT_decl_file 150 .byte 11 ## DW_FORM_data1 151 .byte 59 ## DW_AT_decl_line 152 .byte 11 ## DW_FORM_data1 153 .byte 0 ## EOM(1) 154 .byte 0 ## EOM(2) 155 .byte 7 ## Abbreviation Code 156 .byte 23 ## DW_TAG_union_type 157 .byte 1 ## DW_CHILDREN_yes 158 .byte 11 ## DW_AT_byte_size 159 .byte 11 ## DW_FORM_data1 160 .byte 58 ## DW_AT_decl_file 161 .byte 11 ## DW_FORM_data1 162 .byte 59 ## DW_AT_decl_line 163 .byte 11 ## DW_FORM_data1 164 .byte 0 ## EOM(1) 165 .byte 0 ## EOM(2) 166 .byte 8 ## Abbreviation Code 167 .byte 13 ## DW_TAG_member 168 .byte 0 ## DW_CHILDREN_no 169 .byte 3 ## DW_AT_name 170 .byte 14 ## DW_FORM_strp 171 .byte 73 ## DW_AT_type 172 .byte 19 ## DW_FORM_ref4 173 .byte 58 ## DW_AT_decl_file 174 .byte 11 ## DW_FORM_data1 175 .byte 59 ## DW_AT_decl_line 176 .byte 11 ## DW_FORM_data1 177 .byte 56 ## DW_AT_data_member_location 178 .byte 11 ## DW_FORM_data1 179 .byte 0 ## EOM(1) 180 .byte 0 ## EOM(2) 181 .byte 9 ## Abbreviation Code 182 .byte 13 ## DW_TAG_member 183 .byte 0 ## DW_CHILDREN_no 184 .byte 73 ## DW_AT_type 185 .byte 19 ## DW_FORM_ref4 186 .byte 58 ## DW_AT_decl_file 187 .byte 11 ## DW_FORM_data1 188 .byte 59 ## DW_AT_decl_line 189 .byte 11 ## DW_FORM_data1 190 .byte 56 ## DW_AT_data_member_location 191 .byte 11 ## DW_FORM_data1 192 .byte 0 ## EOM(1) 193 .byte 0 ## EOM(2) 194 .byte 10 ## Abbreviation Code 195 .byte 19 ## DW_TAG_structure_type 196 .byte 1 ## DW_CHILDREN_yes 197 .byte 11 ## DW_AT_byte_size 198 .byte 11 ## DW_FORM_data1 199 .byte 58 ## DW_AT_decl_file 200 .byte 11 ## DW_FORM_data1 201 .byte 59 ## DW_AT_decl_line 202 .byte 11 ## DW_FORM_data1 203 .byte 0 ## EOM(1) 204 .byte 0 ## EOM(2) 205 .byte 11 ## Abbreviation Code 206 .byte 13 ## DW_TAG_member 207 .byte 0 ## DW_CHILDREN_no 208 .byte 3 ## DW_AT_name 209 .byte 14 ## DW_FORM_strp 210 .byte 73 ## DW_AT_type 211 .byte 19 ## DW_FORM_ref4 212 .byte 58 ## DW_AT_decl_file 213 .byte 11 ## DW_FORM_data1 214 .byte 59 ## DW_AT_decl_line 215 .byte 11 ## DW_FORM_data1 216 .byte 13 ## DW_AT_bit_size 217 .byte 11 ## DW_FORM_data1 218 .byte 107 ## DW_AT_data_bit_offset 219 .byte 11 ## DW_FORM_data1 220 .byte 0 ## EOM(1) 221 .byte 0 ## EOM(2) 222 .byte 12 ## Abbreviation Code 223 .byte 46 ## DW_TAG_subprogram 224 .byte 0 ## DW_CHILDREN_no 225 .byte 17 ## DW_AT_low_pc 226 .byte 1 ## DW_FORM_addr 227 .byte 18 ## DW_AT_high_pc 228 .byte 6 ## DW_FORM_data4 229 .byte 64 ## DW_AT_frame_base 230 .byte 24 ## DW_FORM_exprloc 231 .byte 122 ## DW_AT_call_all_calls 232 .byte 25 ## DW_FORM_flag_present 233 .byte 3 ## DW_AT_name 234 .byte 14 ## DW_FORM_strp 235 .byte 58 ## DW_AT_decl_file 236 .byte 11 ## DW_FORM_data1 237 .byte 59 ## DW_AT_decl_line 238 .byte 11 ## DW_FORM_data1 239 .byte 73 ## DW_AT_type 240 .byte 19 ## DW_FORM_ref4 241 .byte 63 ## DW_AT_external 242 .byte 25 ## DW_FORM_flag_present 243 .ascii "\341\177" ## DW_AT_APPLE_optimized 244 .byte 25 ## DW_FORM_flag_present 245 .byte 0 ## EOM(1) 246 .byte 0 ## EOM(2) 247 .byte 13 ## Abbreviation Code 248 .byte 46 ## DW_TAG_subprogram 249 .byte 1 ## DW_CHILDREN_yes 250 .byte 17 ## DW_AT_low_pc 251 .byte 1 ## DW_FORM_addr 252 .byte 18 ## DW_AT_high_pc 253 .byte 6 ## DW_FORM_data4 254 .byte 64 ## DW_AT_frame_base 255 .byte 24 ## DW_FORM_exprloc 256 .byte 122 ## DW_AT_call_all_calls 257 .byte 25 ## DW_FORM_flag_present 258 .byte 3 ## DW_AT_name 259 .byte 14 ## DW_FORM_strp 260 .byte 58 ## DW_AT_decl_file 261 .byte 11 ## DW_FORM_data1 262 .byte 59 ## DW_AT_decl_line 263 .byte 11 ## DW_FORM_data1 264 .byte 73 ## DW_AT_type 265 .byte 19 ## DW_FORM_ref4 266 .byte 63 ## DW_AT_external 267 .byte 25 ## DW_FORM_flag_present 268 .ascii "\341\177" ## DW_AT_APPLE_optimized 269 .byte 25 ## DW_FORM_flag_present 270 .byte 0 ## EOM(1) 271 .byte 0 ## EOM(2) 272 .byte 14 ## Abbreviation Code 273 .byte 52 ## DW_TAG_variable 274 .byte 0 ## DW_CHILDREN_no 275 .byte 28 ## DW_AT_const_value 276 .byte 15 ## DW_FORM_udata 277 .byte 3 ## DW_AT_name 278 .byte 14 ## DW_FORM_strp 279 .byte 58 ## DW_AT_decl_file 280 .byte 11 ## DW_FORM_data1 281 .byte 59 ## DW_AT_decl_line 282 .byte 11 ## DW_FORM_data1 283 .byte 73 ## DW_AT_type 284 .byte 19 ## DW_FORM_ref4 285 .byte 0 ## EOM(1) 286 .byte 0 ## EOM(2) 287 .byte 0 ## EOM(3) 288 .section __DWARF,__debug_info,regular,debug 289Lsection_info: 290Lcu_begin0: 291.set Lset0, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit 292 .long Lset0 293Ldebug_info_start0: 294 .short 4 ## DWARF version number 295.set Lset1, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section 296 .long Lset1 297 .byte 8 ## Address Size (in bytes) 298 .byte 1 ## Abbrev [1] 0xb:0x112 DW_TAG_compile_unit 299 .long 0 ## DW_AT_producer 300 .short 12 ## DW_AT_language 301 .long 47 ## DW_AT_name 302 .long 0 ## DW_AT_stmt_list 303 .long 71 ## DW_AT_comp_dir 304 ## DW_AT_GNU_pubnames 305 ## DW_AT_APPLE_optimized 306 .quad 0 ## DW_AT_low_pc 307 .long 0 308 .byte 2 ## Abbrev [2] 0x2a:0x10 DW_TAG_variable 309 .long 90 ## DW_AT_name 310 .long 91 ## DW_AT_type 311 .byte 1 ## DW_AT_decl_file 312 .byte 16 ## DW_AT_decl_line 313 .ascii "\201\202\220\245\006" ## DW_AT_const_value 314 .byte 3 ## Abbrev [3] 0x3a:0x5 DW_TAG_const_type 315 .long 63 ## DW_AT_type 316 .byte 4 ## Abbrev [4] 0x3f:0x7 DW_TAG_base_type 317 .long 99 ## DW_AT_name 318 .byte 5 ## DW_AT_encoding 319 .byte 4 ## DW_AT_byte_size 320 .byte 5 ## Abbrev [5] 0x46:0x15 DW_TAG_variable 321 .long 103 ## DW_AT_name 322 .long 91 ## DW_AT_type 323 .byte 1 ## DW_AT_decl_file 324 .byte 15 ## DW_AT_decl_line 325 .byte 9 ## DW_AT_location 326 .byte 3 327 .quad __type_anchor 328 .byte 6 ## Abbrev [6] 0x5b:0xb DW_TAG_typedef 329 .long 102 ## DW_AT_type 330 .long 116 ## DW_AT_name 331 .byte 1 ## DW_AT_decl_file 332 .byte 13 ## DW_AT_decl_line 333 .byte 7 ## Abbrev [7] 0x66:0x6c DW_TAG_union_type 334 .byte 4 ## DW_AT_byte_size 335 .byte 1 ## DW_AT_decl_file 336 .byte 1 ## DW_AT_decl_line 337 .byte 8 ## Abbrev [8] 0x6a:0xc DW_TAG_member 338 .long 118 ## DW_AT_name 339 .long 210 ## DW_AT_type 340 .byte 1 ## DW_AT_decl_file 341 .byte 3 ## DW_AT_decl_line 342 .byte 0 ## DW_AT_data_member_location 343 .byte 9 ## Abbrev [9] 0x76:0x8 DW_TAG_member 344 .long 126 ## DW_AT_type 345 .byte 1 ## DW_AT_decl_file 346 .byte 4 ## DW_AT_decl_line 347 .byte 0 ## DW_AT_data_member_location 348 .byte 10 ## Abbrev [10] 0x7e:0x53 DW_TAG_structure_type 349 .byte 4 ## DW_AT_byte_size 350 .byte 1 ## DW_AT_decl_file 351 .byte 4 ## DW_AT_decl_line 352 .byte 11 ## Abbrev [11] 0x82:0xd DW_TAG_member 353 .long 135 ## DW_AT_name 354 .long 210 ## DW_AT_type 355 .byte 1 ## DW_AT_decl_file 356 .byte 6 ## DW_AT_decl_line 357 .byte 8 ## DW_AT_bit_size 358 .byte 0 ## DW_AT_data_bit_offset 359 .byte 11 ## Abbrev [11] 0x8f:0xd DW_TAG_member 360 .long 137 ## DW_AT_name 361 .long 210 ## DW_AT_type 362 .byte 1 ## DW_AT_decl_file 363 .byte 7 ## DW_AT_decl_line 364 .byte 8 ## DW_AT_bit_size 365 .byte 8 ## DW_AT_data_bit_offset 366 .byte 11 ## Abbrev [11] 0x9c:0xd DW_TAG_member 367 .long 139 ## DW_AT_name 368 .long 210 ## DW_AT_type 369 .byte 1 ## DW_AT_decl_file 370 .byte 8 ## DW_AT_decl_line 371 .byte 6 ## DW_AT_bit_size 372 .byte 16 ## DW_AT_data_bit_offset 373 .byte 11 ## Abbrev [11] 0xa9:0xd DW_TAG_member 374 .long 141 ## DW_AT_name 375 .long 210 ## DW_AT_type 376 .byte 1 ## DW_AT_decl_file 377 .byte 9 ## DW_AT_decl_line 378 .byte 2 ## DW_AT_bit_size 379 .byte 22 ## DW_AT_data_bit_offset 380 .byte 11 ## Abbrev [11] 0xb6:0xd DW_TAG_member 381 .long 143 ## DW_AT_name 382 .long 210 ## DW_AT_type 383 .byte 1 ## DW_AT_decl_file 384 .byte 10 ## DW_AT_decl_line 385 .byte 6 ## DW_AT_bit_size 386 .byte 24 ## DW_AT_data_bit_offset 387 .byte 11 ## Abbrev [11] 0xc3:0xd DW_TAG_member 388 .long 145 ## DW_AT_name 389 .long 210 ## DW_AT_type 390 .byte 1 ## DW_AT_decl_file 391 .byte 11 ## DW_AT_decl_line 392 .byte 2 ## DW_AT_bit_size 393 .byte 30 ## DW_AT_data_bit_offset 394 .byte 0 ## End Of Children Mark 395 .byte 0 ## End Of Children Mark 396 .byte 4 ## Abbrev [4] 0xd2:0x7 DW_TAG_base_type 397 .long 122 ## DW_AT_name 398 .byte 7 ## DW_AT_encoding 399 .byte 4 ## DW_AT_byte_size 400 .byte 14 ## Abbrev [14] 0x10b:0x10 DW_TAG_variable 401 .ascii "\201\202\220\245\006" ## DW_AT_const_value 402 .long 154 ## DW_AT_name 403 .byte 1 ## DW_AT_decl_file 404 .byte 21 ## DW_AT_decl_line 405 .long 91 ## DW_AT_type 406 .byte 0 ## End Of Children Mark 407 .byte 0 ## End Of Children Mark 408Ldebug_info_end0: 409