1 ; REQUIRES: object-emission 2 3 ; RUN: %llc_dwarf -O2 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s 4 5 ; This is a test case that's as reduced as I can get it, though I haven't fully 6 ; understood the mechanisms by which this bug occurs, so perhaps there's further 7 ; simplification to be had (it's certainly a bit non-obvious what's going on). I 8 ; hesitate to hand-craft or otherwise simplify the IR compared to what Clang 9 ; generates as this is a particular tickling of optimizations and debug location 10 ; propagation I want a realistic example of. 11 12 ; Generated with clang-tot -cc1 -g -O2 -w -std=c++11 -fsanitize=address,use-after-return -fcxx-exceptions -fexceptions -x c++ incorrect-variable-debug-loc.cpp -emit-llvm 13 14 ; struct A { 15 ; int m_fn1(); 16 ; }; 17 ; 18 ; struct B { 19 ; void __attribute__((always_inline)) m_fn2() { i = 0; } 20 ; int i; 21 ; }; 22 ; 23 ; struct C { 24 ; void m_fn3(); 25 ; int j; 26 ; B b; 27 ; }; 28 ; 29 ; int fn1() { 30 ; C A; 31 ; A.b.m_fn2(); 32 ; A.m_fn3(); 33 ; } 34 ; void C::m_fn3() { 35 ; A().m_fn1(); 36 ; b.m_fn2(); 37 ; } 38 39 ; CHECK: DW_TAG_structure_type 40 ; CHECK-NEXT: DW_AT_name {{.*}} "C" 41 ; CHECK: DW_TAG_subprogram 42 ; CHECK-NOT: DW_TAG 43 ; CHECK: DW_AT_name {{.*}} "m_fn3" 44 45 ; CHECK: DW_AT_specification {{.*}} "_ZN1C5m_fn3Ev" 46 ; CHECK-NOT: DW_TAG 47 ; CHECK: DW_TAG_formal_parameter 48 ; CHECK-NOT: DW_TAG 49 ; CHECK: DW_AT_name {{.*}} "this" 50 51 %struct.C = type { i32, %struct.B } 52 %struct.B = type { i32 } 53 %struct.A = type { i8 } 54 55 @llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }] 56 @__asan_option_detect_stack_use_after_return = external global i32 57 @__asan_gen_ = private unnamed_addr constant [11 x i8] c"1 32 8 1 A\00", align 1 58 @__asan_gen_1 = private unnamed_addr constant [13 x i8] c"1 32 1 3 tmp\00", align 1 59 60 ; Function Attrs: noreturn sanitize_address 61 define i32 @_Z3fn1v() #0 { 62 entry: 63 %MyAlloca = alloca [64 x i8], align 32, !dbg !39 64 %0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !39 65 %1 = load i32, i32* @__asan_option_detect_stack_use_after_return, !dbg !39 66 %2 = icmp ne i32 %1, 0, !dbg !39 67 br i1 %2, label %3, label %5 68 69 ; <label>:3 ; preds = %entry 70 %4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !39 71 br label %5 72 73 ; <label>:5 ; preds = %entry, %3 74 %6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !39 75 %7 = add i64 %6, 32, !dbg !39 76 %8 = inttoptr i64 %7 to %struct.C*, !dbg !39 77 %9 = inttoptr i64 %6 to i64*, !dbg !39 78 store i64 1102416563, i64* %9, !dbg !39 79 %10 = add i64 %6, 8, !dbg !39 80 %11 = inttoptr i64 %10 to i64*, !dbg !39 81 store i64 ptrtoint ([11 x i8]* @__asan_gen_ to i64), i64* %11, !dbg !39 82 %12 = add i64 %6, 16, !dbg !39 83 %13 = inttoptr i64 %12 to i64*, !dbg !39 84 store i64 ptrtoint (i32 ()* @_Z3fn1v to i64), i64* %13, !dbg !39 85 %14 = lshr i64 %6, 3, !dbg !39 86 %15 = add i64 %14, 2147450880, !dbg !39 87 %16 = add i64 %15, 0, !dbg !39 88 %17 = inttoptr i64 %16 to i64*, !dbg !39 89 store i64 -868083117767659023, i64* %17, !dbg !39 90 %i.i = getelementptr inbounds %struct.C, %struct.C* %8, i64 0, i32 1, i32 0, !dbg !39 91 %18 = ptrtoint i32* %i.i to i64, !dbg !39 92 %19 = lshr i64 %18, 3, !dbg !39 93 %20 = add i64 %19, 2147450880, !dbg !39 94 %21 = inttoptr i64 %20 to i8*, !dbg !39 95 %22 = load i8, i8* %21, !dbg !39 96 %23 = icmp ne i8 %22, 0, !dbg !39 97 br i1 %23, label %24, label %30, !dbg !39 98 99 ; <label>:24 ; preds = %5 100 %25 = and i64 %18, 7, !dbg !39 101 %26 = add i64 %25, 3, !dbg !39 102 %27 = trunc i64 %26 to i8, !dbg !39 103 %28 = icmp sge i8 %27, %22, !dbg !39 104 br i1 %28, label %29, label %30 105 106 ; <label>:29 ; preds = %24 107 call void @__asan_report_store4(i64 %18), !dbg !39 108 call void asm sideeffect "", ""() 109 unreachable 110 111 ; <label>:30 ; preds = %24, %5 112 store i32 0, i32* %i.i, align 4, !dbg !39, !tbaa !41 113 tail call void @llvm.dbg.value(metadata %struct.C* %8, i64 0, metadata !27, metadata !MDExpression()), !dbg !46 114 call void @_ZN1C5m_fn3Ev(%struct.C* %8), !dbg !47 115 unreachable, !dbg !47 116 } 117 118 ; Function Attrs: sanitize_address 119 define void @_ZN1C5m_fn3Ev(%struct.C* nocapture %this) #1 align 2 { 120 entry: 121 %MyAlloca = alloca [64 x i8], align 32, !dbg !48 122 %0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !48 123 %1 = load i32, i32* @__asan_option_detect_stack_use_after_return, !dbg !48 124 %2 = icmp ne i32 %1, 0, !dbg !48 125 br i1 %2, label %3, label %5 126 127 ; <label>:3 ; preds = %entry 128 %4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !48 129 br label %5 130 131 ; <label>:5 ; preds = %entry, %3 132 %6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !48 133 %7 = add i64 %6, 32, !dbg !48 134 %8 = inttoptr i64 %7 to %struct.A*, !dbg !48 135 %9 = inttoptr i64 %6 to i64*, !dbg !48 136 store i64 1102416563, i64* %9, !dbg !48 137 %10 = add i64 %6, 8, !dbg !48 138 %11 = inttoptr i64 %10 to i64*, !dbg !48 139 store i64 ptrtoint ([13 x i8]* @__asan_gen_1 to i64), i64* %11, !dbg !48 140 %12 = add i64 %6, 16, !dbg !48 141 %13 = inttoptr i64 %12 to i64*, !dbg !48 142 store i64 ptrtoint (void (%struct.C*)* @_ZN1C5m_fn3Ev to i64), i64* %13, !dbg !48 143 %14 = lshr i64 %6, 3, !dbg !48 144 %15 = add i64 %14, 2147450880, !dbg !48 145 %16 = add i64 %15, 0, !dbg !48 146 %17 = inttoptr i64 %16 to i64*, !dbg !48 147 store i64 -868083113472691727, i64* %17, !dbg !48 148 tail call void @llvm.dbg.value(metadata %struct.C* %this, i64 0, metadata !30, metadata !MDExpression()), !dbg !48 149 %call = call i32 @_ZN1A5m_fn1Ev(%struct.A* %8), !dbg !49 150 %i.i = getelementptr inbounds %struct.C, %struct.C* %this, i64 0, i32 1, i32 0, !dbg !50 151 %18 = ptrtoint i32* %i.i to i64, !dbg !50 152 %19 = lshr i64 %18, 3, !dbg !50 153 %20 = add i64 %19, 2147450880, !dbg !50 154 %21 = inttoptr i64 %20 to i8*, !dbg !50 155 %22 = load i8, i8* %21, !dbg !50 156 %23 = icmp ne i8 %22, 0, !dbg !50 157 br i1 %23, label %24, label %30, !dbg !50 158 159 ; <label>:24 ; preds = %5 160 %25 = and i64 %18, 7, !dbg !50 161 %26 = add i64 %25, 3, !dbg !50 162 %27 = trunc i64 %26 to i8, !dbg !50 163 %28 = icmp sge i8 %27, %22, !dbg !50 164 br i1 %28, label %29, label %30 165 166 ; <label>:29 ; preds = %24 167 call void @__asan_report_store4(i64 %18), !dbg !50 168 call void asm sideeffect "", ""() 169 unreachable 170 171 ; <label>:30 ; preds = %24, %5 172 store i32 0, i32* %i.i, align 4, !dbg !50, !tbaa !41 173 store i64 1172321806, i64* %9, !dbg !52 174 %31 = icmp ne i64 %6, %0, !dbg !52 175 br i1 %31, label %32, label %39, !dbg !52 176 177 ; <label>:32 ; preds = %30 178 %33 = add i64 %15, 0, !dbg !52 179 %34 = inttoptr i64 %33 to i64*, !dbg !52 180 store i64 -723401728380766731, i64* %34, !dbg !52 181 %35 = add i64 %6, 56, !dbg !52 182 %36 = inttoptr i64 %35 to i64*, !dbg !52 183 %37 = load i64, i64* %36, !dbg !52 184 %38 = inttoptr i64 %37 to i8*, !dbg !52 185 store i8 0, i8* %38, !dbg !52 186 br label %42, !dbg !52 187 188 ; <label>:39 ; preds = %30 189 %40 = add i64 %15, 0, !dbg !52 190 %41 = inttoptr i64 %40 to i64*, !dbg !52 191 store i64 0, i64* %41, !dbg !52 192 br label %42, !dbg !52 193 194 ; <label>:42 ; preds = %39, %32 195 ret void, !dbg !52 196 } 197 198 declare i32 @_ZN1A5m_fn1Ev(%struct.A*) #2 199 200 ; Function Attrs: nounwind readnone 201 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3 202 203 define internal void @asan.module_ctor() { 204 tail call void @__asan_init_v3() 205 ret void 206 } 207 208 declare void @__asan_init_v3() 209 210 declare void @__asan_report_load1(i64) 211 212 declare void @__asan_load1(i64) 213 214 declare void @__asan_report_load2(i64) 215 216 declare void @__asan_load2(i64) 217 218 declare void @__asan_report_load4(i64) 219 220 declare void @__asan_load4(i64) 221 222 declare void @__asan_report_load8(i64) 223 224 declare void @__asan_load8(i64) 225 226 declare void @__asan_report_load16(i64) 227 228 declare void @__asan_load16(i64) 229 230 declare void @__asan_report_store1(i64) 231 232 declare void @__asan_store1(i64) 233 234 declare void @__asan_report_store2(i64) 235 236 declare void @__asan_store2(i64) 237 238 declare void @__asan_report_store4(i64) 239 240 declare void @__asan_store4(i64) 241 242 declare void @__asan_report_store8(i64) 243 244 declare void @__asan_store8(i64) 245 246 declare void @__asan_report_store16(i64) 247 248 declare void @__asan_store16(i64) 249 250 declare void @__asan_report_load_n(i64, i64) 251 252 declare void @__asan_report_store_n(i64, i64) 253 254 declare void @__asan_loadN(i64, i64) 255 256 declare void @__asan_storeN(i64, i64) 257 258 declare i8* @__asan_memmove(i8*, i8*, i64) 259 260 declare i8* @__asan_memcpy(i8*, i8*, i64) 261 262 declare i8* @__asan_memset(i8*, i32, i64) 263 264 declare void @__asan_handle_no_return() 265 266 declare void @__sanitizer_cov() 267 268 declare void @__sanitizer_ptr_cmp(i64, i64) 269 270 declare void @__sanitizer_ptr_sub(i64, i64) 271 272 declare i64 @__asan_stack_malloc_0(i64, i64) 273 274 declare void @__asan_stack_free_0(i64, i64, i64) 275 276 declare i64 @__asan_stack_malloc_1(i64, i64) 277 278 declare void @__asan_stack_free_1(i64, i64, i64) 279 280 declare i64 @__asan_stack_malloc_2(i64, i64) 281 282 declare void @__asan_stack_free_2(i64, i64, i64) 283 284 declare i64 @__asan_stack_malloc_3(i64, i64) 285 286 declare void @__asan_stack_free_3(i64, i64, i64) 287 288 declare i64 @__asan_stack_malloc_4(i64, i64) 289 290 declare void @__asan_stack_free_4(i64, i64, i64) 291 292 declare i64 @__asan_stack_malloc_5(i64, i64) 293 294 declare void @__asan_stack_free_5(i64, i64, i64) 295 296 declare i64 @__asan_stack_malloc_6(i64, i64) 297 298 declare void @__asan_stack_free_6(i64, i64, i64) 299 300 declare i64 @__asan_stack_malloc_7(i64, i64) 301 302 declare void @__asan_stack_free_7(i64, i64, i64) 303 304 declare i64 @__asan_stack_malloc_8(i64, i64) 305 306 declare void @__asan_stack_free_8(i64, i64, i64) 307 308 declare i64 @__asan_stack_malloc_9(i64, i64) 309 310 declare void @__asan_stack_free_9(i64, i64, i64) 311 312 declare i64 @__asan_stack_malloc_10(i64, i64) 313 314 declare void @__asan_stack_free_10(i64, i64, i64) 315 316 declare void @__asan_poison_stack_memory(i64, i64) 317 318 declare void @__asan_unpoison_stack_memory(i64, i64) 319 320 declare void @__asan_before_dynamic_init(i64) 321 322 declare void @__asan_after_dynamic_init() 323 324 declare void @__asan_register_globals(i64, i64) 325 326 declare void @__asan_unregister_globals(i64, i64) 327 328 declare void @__sanitizer_cov_module_init(i64) 329 330 attributes #0 = { noreturn sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 331 attributes #1 = { sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 332 attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 333 attributes #3 = { nounwind readnone } 334 335 !llvm.dbg.cu = !{!0} 336 !llvm.module.flags = !{!36, !37} 337 !llvm.ident = !{!38} 338 339 !0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !21, globals: !2, imports: !2) 340 !1 = !MDFile(filename: "<stdin>", directory: "/tmp/dbginfo") 341 !2 = !{} 342 !3 = !{!4, !14} 343 !4 = !MDCompositeType(tag: DW_TAG_structure_type, name: "C", line: 10, size: 64, align: 32, file: !5, elements: !6, identifier: "_ZTS1C") 344 !5 = !MDFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo") 345 !6 = !{!7, !9, !10} 346 !7 = !MDDerivedType(tag: DW_TAG_member, name: "j", line: 12, size: 32, align: 32, file: !5, scope: !"_ZTS1C", baseType: !8) 347 !8 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 348 !9 = !MDDerivedType(tag: DW_TAG_member, name: "b", line: 13, size: 32, align: 32, offset: 32, file: !5, scope: !"_ZTS1C", baseType: !"_ZTS1B") 349 !10 = !MDSubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 11, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 11, file: !5, scope: !"_ZTS1C", type: !11) 350 !11 = !MDSubroutineType(types: !12) 351 !12 = !{null, !13} 352 !13 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !"_ZTS1C") 353 !14 = !MDCompositeType(tag: DW_TAG_structure_type, name: "B", line: 5, size: 32, align: 32, file: !5, elements: !15, identifier: "_ZTS1B") 354 !15 = !{!16, !17} 355 !16 = !MDDerivedType(tag: DW_TAG_member, name: "i", line: 7, size: 32, align: 32, file: !5, scope: !"_ZTS1B", baseType: !8) 356 !17 = !MDSubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 6, file: !5, scope: !"_ZTS1B", type: !18) 357 !18 = !MDSubroutineType(types: !19) 358 !19 = !{null, !20} 359 !20 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !"_ZTS1B") 360 !21 = !{!22, !28, !32} 361 !22 = !MDSubprogram(name: "fn1", linkageName: "_Z3fn1v", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 16, file: !5, scope: !23, type: !24, function: i32 ()* @_Z3fn1v, variables: !26) 362 !23 = !MDFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo") 363 !24 = !MDSubroutineType(types: !25) 364 !25 = !{!8} 365 !26 = !{!27} 366 !27 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "A", line: 17, scope: !22, file: !23, type: !"_ZTS1C") 367 !28 = !MDSubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 21, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 21, file: !5, scope: !"_ZTS1C", type: !11, function: void (%struct.C*)* @_ZN1C5m_fn3Ev, declaration: !10, variables: !29) 368 !29 = !{!30} 369 !30 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !28, type: !31) 370 !31 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !"_ZTS1C") 371 !32 = !MDSubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 6, file: !5, scope: !"_ZTS1B", type: !18, declaration: !17, variables: !33) 372 !33 = !{!34} 373 !34 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !32, type: !35) 374 !35 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !"_ZTS1B") 375 !36 = !{i32 2, !"Dwarf Version", i32 4} 376 !37 = !{i32 2, !"Debug Info Version", i32 3} 377 !38 = !{!"clang version 3.5.0 "} 378 !39 = !MDLocation(line: 6, scope: !32, inlinedAt: !40) 379 !40 = !MDLocation(line: 18, scope: !22) 380 !41 = !{!42, !43, i64 0} 381 !42 = !{!"_ZTS1B", !43, i64 0} 382 !43 = !{!"int", !44, i64 0} 383 !44 = !{!"omnipotent char", !45, i64 0} 384 !45 = !{!"Simple C/C++ TBAA"} 385 !46 = !MDLocation(line: 17, scope: !22) 386 !47 = !MDLocation(line: 19, scope: !22) 387 !48 = !MDLocation(line: 0, scope: !28) 388 !49 = !MDLocation(line: 22, scope: !28) 389 !50 = !MDLocation(line: 6, scope: !32, inlinedAt: !51) 390 !51 = !MDLocation(line: 23, scope: !28) 391 !52 = !MDLocation(line: 24, scope: !28) 392
