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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: [[M_FN3_DECL:.*]]:  DW_TAG_subprogram
42; CHECK-NOT: {{DW_TAG|NULL}}
43; CHECK: DW_AT_name {{.*}} "m_fn3"
44
45; CHECK: DW_AT_specification {{.*}} {[[M_FN3_DECL]]}
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 !dbg !22 {
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 !DIExpression(DW_OP_deref)), !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 !dbg !28 {
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 !DIExpression()), !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 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
340!1 = !DIFile(filename: "<stdin>", directory: "/tmp/dbginfo")
341!2 = !{}
342!3 = !{!4, !14}
343!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "C", line: 10, size: 64, align: 32, file: !5, elements: !6, identifier: "_ZTS1C")
344!5 = !DIFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo")
345!6 = !{!7, !9, !10}
346!7 = !DIDerivedType(tag: DW_TAG_member, name: "j", line: 12, size: 32, align: 32, file: !5, scope: !4, baseType: !8)
347!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
348!9 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 13, size: 32, align: 32, offset: 32, file: !5, scope: !4, baseType: !14)
349!10 = !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 11, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 11, file: !5, scope: !4, type: !11)
350!11 = !DISubroutineType(types: !12)
351!12 = !{null, !13}
352!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !4)
353!14 = !DICompositeType(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 = !DIDerivedType(tag: DW_TAG_member, name: "i", line: 7, size: 32, align: 32, file: !5, scope: !14, baseType: !8)
356!17 = !DISubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 6, file: !5, scope: !14, type: !18)
357!18 = !DISubroutineType(types: !19)
358!19 = !{null, !20}
359!20 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !14)
360!22 = distinct !DISubprogram(name: "fn1", linkageName: "_Z3fn1v", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 16, file: !5, scope: !23, type: !24, variables: !26)
361!23 = !DIFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo")
362!24 = !DISubroutineType(types: !25)
363!25 = !{!8}
364!26 = !{!27}
365!27 = !DILocalVariable(name: "A", line: 17, scope: !22, file: !23, type: !4)
366!28 = distinct !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 21, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 21, file: !5, scope: !4, type: !11, declaration: !10, variables: !29)
367!29 = !{!30}
368!30 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !28, type: !31)
369!31 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !4)
370!32 = distinct !DISubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 6, file: !5, scope: !14, type: !18, declaration: !17, variables: !33)
371!33 = !{!34}
372!34 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !32, type: !35)
373!35 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !14)
374!36 = !{i32 2, !"Dwarf Version", i32 4}
375!37 = !{i32 2, !"Debug Info Version", i32 3}
376!38 = !{!"clang version 3.5.0 "}
377!39 = !DILocation(line: 6, scope: !32, inlinedAt: !40)
378!40 = !DILocation(line: 18, scope: !22)
379!41 = !{!42, !43, i64 0}
380!42 = !{!14, !43, i64 0}
381!43 = !{!"int", !44, i64 0}
382!44 = !{!"omnipotent char", !45, i64 0}
383!45 = !{!"Simple C/C++ TBAA"}
384!46 = !DILocation(line: 17, scope: !22)
385!47 = !DILocation(line: 19, scope: !22)
386!48 = !DILocation(line: 0, scope: !28)
387!49 = !DILocation(line: 22, scope: !28)
388!50 = !DILocation(line: 6, scope: !32, inlinedAt: !51)
389!51 = !DILocation(line: 23, scope: !28)
390!52 = !DILocation(line: 24, scope: !28)
391