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 61define i32 @_Z3fn1v() #0 { 62entry: 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 119define void @_ZN1C5m_fn3Ev(%struct.C* nocapture %this) #1 align 2 { 120entry: 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 198declare i32 @_ZN1A5m_fn1Ev(%struct.A*) #2 199 200; Function Attrs: nounwind readnone 201declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3 202 203define internal void @asan.module_ctor() { 204 tail call void @__asan_init_v3() 205 ret void 206} 207 208declare void @__asan_init_v3() 209 210declare void @__asan_report_load1(i64) 211 212declare void @__asan_load1(i64) 213 214declare void @__asan_report_load2(i64) 215 216declare void @__asan_load2(i64) 217 218declare void @__asan_report_load4(i64) 219 220declare void @__asan_load4(i64) 221 222declare void @__asan_report_load8(i64) 223 224declare void @__asan_load8(i64) 225 226declare void @__asan_report_load16(i64) 227 228declare void @__asan_load16(i64) 229 230declare void @__asan_report_store1(i64) 231 232declare void @__asan_store1(i64) 233 234declare void @__asan_report_store2(i64) 235 236declare void @__asan_store2(i64) 237 238declare void @__asan_report_store4(i64) 239 240declare void @__asan_store4(i64) 241 242declare void @__asan_report_store8(i64) 243 244declare void @__asan_store8(i64) 245 246declare void @__asan_report_store16(i64) 247 248declare void @__asan_store16(i64) 249 250declare void @__asan_report_load_n(i64, i64) 251 252declare void @__asan_report_store_n(i64, i64) 253 254declare void @__asan_loadN(i64, i64) 255 256declare void @__asan_storeN(i64, i64) 257 258declare i8* @__asan_memmove(i8*, i8*, i64) 259 260declare i8* @__asan_memcpy(i8*, i8*, i64) 261 262declare i8* @__asan_memset(i8*, i32, i64) 263 264declare void @__asan_handle_no_return() 265 266declare void @__sanitizer_cov() 267 268declare void @__sanitizer_ptr_cmp(i64, i64) 269 270declare void @__sanitizer_ptr_sub(i64, i64) 271 272declare i64 @__asan_stack_malloc_0(i64, i64) 273 274declare void @__asan_stack_free_0(i64, i64, i64) 275 276declare i64 @__asan_stack_malloc_1(i64, i64) 277 278declare void @__asan_stack_free_1(i64, i64, i64) 279 280declare i64 @__asan_stack_malloc_2(i64, i64) 281 282declare void @__asan_stack_free_2(i64, i64, i64) 283 284declare i64 @__asan_stack_malloc_3(i64, i64) 285 286declare void @__asan_stack_free_3(i64, i64, i64) 287 288declare i64 @__asan_stack_malloc_4(i64, i64) 289 290declare void @__asan_stack_free_4(i64, i64, i64) 291 292declare i64 @__asan_stack_malloc_5(i64, i64) 293 294declare void @__asan_stack_free_5(i64, i64, i64) 295 296declare i64 @__asan_stack_malloc_6(i64, i64) 297 298declare void @__asan_stack_free_6(i64, i64, i64) 299 300declare i64 @__asan_stack_malloc_7(i64, i64) 301 302declare void @__asan_stack_free_7(i64, i64, i64) 303 304declare i64 @__asan_stack_malloc_8(i64, i64) 305 306declare void @__asan_stack_free_8(i64, i64, i64) 307 308declare i64 @__asan_stack_malloc_9(i64, i64) 309 310declare void @__asan_stack_free_9(i64, i64, i64) 311 312declare i64 @__asan_stack_malloc_10(i64, i64) 313 314declare void @__asan_stack_free_10(i64, i64, i64) 315 316declare void @__asan_poison_stack_memory(i64, i64) 317 318declare void @__asan_unpoison_stack_memory(i64, i64) 319 320declare void @__asan_before_dynamic_init(i64) 321 322declare void @__asan_after_dynamic_init() 323 324declare void @__asan_register_globals(i64, i64) 325 326declare void @__asan_unregister_globals(i64, i64) 327 328declare void @__sanitizer_cov_module_init(i64) 329 330attributes #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" } 331attributes #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" } 332attributes #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" } 333attributes #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