1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
|
; REQUIRES: object-emission
; RUN: %llc_dwarf -O2 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; This is a test case that's as reduced as I can get it, though I haven't fully
; understood the mechanisms by which this bug occurs, so perhaps there's further
; simplification to be had (it's certainly a bit non-obvious what's going on). I
; hesitate to hand-craft or otherwise simplify the IR compared to what Clang
; generates as this is a particular tickling of optimizations and debug location
; propagation I want a realistic example of.
; 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
; struct A {
; int m_fn1();
; };
;
; struct B {
; void __attribute__((always_inline)) m_fn2() { i = 0; }
; int i;
; };
;
; struct C {
; void m_fn3();
; int j;
; B b;
; };
;
; int fn1() {
; C A;
; A.b.m_fn2();
; A.m_fn3();
; }
; void C::m_fn3() {
; A().m_fn1();
; b.m_fn2();
; }
; CHECK: DW_TAG_structure_type
; CHECK-NEXT: DW_AT_name {{.*}} "C"
; CHECK: [[FN3_DECL:.*]]: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "m_fn3"
; CHECK: DW_AT_specification {{.*}} {[[FN3_DECL]]}
; CHECK-NOT: DW_TAG
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "this"
%struct.C = type { i32, %struct.B }
%struct.B = type { i32 }
%struct.A = type { i8 }
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
@__asan_option_detect_stack_use_after_return = external global i32
@__asan_gen_ = private unnamed_addr constant [11 x i8] c"1 32 8 1 A\00", align 1
@__asan_gen_1 = private unnamed_addr constant [13 x i8] c"1 32 1 3 tmp\00", align 1
; Function Attrs: noreturn sanitize_address
define i32 @_Z3fn1v() #0 {
entry:
%MyAlloca = alloca [64 x i8], align 32, !dbg !39
%0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !39
%1 = load i32* @__asan_option_detect_stack_use_after_return, !dbg !39
%2 = icmp ne i32 %1, 0, !dbg !39
br i1 %2, label %3, label %5
; <label>:3 ; preds = %entry
%4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !39
br label %5
; <label>:5 ; preds = %entry, %3
%6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !39
%7 = add i64 %6, 32, !dbg !39
%8 = inttoptr i64 %7 to %struct.C*, !dbg !39
%9 = inttoptr i64 %6 to i64*, !dbg !39
store i64 1102416563, i64* %9, !dbg !39
%10 = add i64 %6, 8, !dbg !39
%11 = inttoptr i64 %10 to i64*, !dbg !39
store i64 ptrtoint ([11 x i8]* @__asan_gen_ to i64), i64* %11, !dbg !39
%12 = add i64 %6, 16, !dbg !39
%13 = inttoptr i64 %12 to i64*, !dbg !39
store i64 ptrtoint (i32 ()* @_Z3fn1v to i64), i64* %13, !dbg !39
%14 = lshr i64 %6, 3, !dbg !39
%15 = add i64 %14, 2147450880, !dbg !39
%16 = add i64 %15, 0, !dbg !39
%17 = inttoptr i64 %16 to i64*, !dbg !39
store i64 -868083117767659023, i64* %17, !dbg !39
%i.i = getelementptr inbounds %struct.C* %8, i64 0, i32 1, i32 0, !dbg !39
%18 = ptrtoint i32* %i.i to i64, !dbg !39
%19 = lshr i64 %18, 3, !dbg !39
%20 = add i64 %19, 2147450880, !dbg !39
%21 = inttoptr i64 %20 to i8*, !dbg !39
%22 = load i8* %21, !dbg !39
%23 = icmp ne i8 %22, 0, !dbg !39
br i1 %23, label %24, label %30, !dbg !39
; <label>:24 ; preds = %5
%25 = and i64 %18, 7, !dbg !39
%26 = add i64 %25, 3, !dbg !39
%27 = trunc i64 %26 to i8, !dbg !39
%28 = icmp sge i8 %27, %22, !dbg !39
br i1 %28, label %29, label %30
; <label>:29 ; preds = %24
call void @__asan_report_store4(i64 %18), !dbg !39
call void asm sideeffect "", ""()
unreachable
; <label>:30 ; preds = %24, %5
store i32 0, i32* %i.i, align 4, !dbg !39, !tbaa !41
tail call void @llvm.dbg.value(metadata !{%struct.C* %8}, i64 0, metadata !27), !dbg !46
call void @_ZN1C5m_fn3Ev(%struct.C* %8), !dbg !47
unreachable, !dbg !47
}
; Function Attrs: sanitize_address
define void @_ZN1C5m_fn3Ev(%struct.C* nocapture %this) #1 align 2 {
entry:
%MyAlloca = alloca [64 x i8], align 32, !dbg !48
%0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !48
%1 = load i32* @__asan_option_detect_stack_use_after_return, !dbg !48
%2 = icmp ne i32 %1, 0, !dbg !48
br i1 %2, label %3, label %5
; <label>:3 ; preds = %entry
%4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !48
br label %5
; <label>:5 ; preds = %entry, %3
%6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !48
%7 = add i64 %6, 32, !dbg !48
%8 = inttoptr i64 %7 to %struct.A*, !dbg !48
%9 = inttoptr i64 %6 to i64*, !dbg !48
store i64 1102416563, i64* %9, !dbg !48
%10 = add i64 %6, 8, !dbg !48
%11 = inttoptr i64 %10 to i64*, !dbg !48
store i64 ptrtoint ([13 x i8]* @__asan_gen_1 to i64), i64* %11, !dbg !48
%12 = add i64 %6, 16, !dbg !48
%13 = inttoptr i64 %12 to i64*, !dbg !48
store i64 ptrtoint (void (%struct.C*)* @_ZN1C5m_fn3Ev to i64), i64* %13, !dbg !48
%14 = lshr i64 %6, 3, !dbg !48
%15 = add i64 %14, 2147450880, !dbg !48
%16 = add i64 %15, 0, !dbg !48
%17 = inttoptr i64 %16 to i64*, !dbg !48
store i64 -868083113472691727, i64* %17, !dbg !48
tail call void @llvm.dbg.value(metadata !{%struct.C* %this}, i64 0, metadata !30), !dbg !48
%call = call i32 @_ZN1A5m_fn1Ev(%struct.A* %8), !dbg !49
%i.i = getelementptr inbounds %struct.C* %this, i64 0, i32 1, i32 0, !dbg !50
%18 = ptrtoint i32* %i.i to i64, !dbg !50
%19 = lshr i64 %18, 3, !dbg !50
%20 = add i64 %19, 2147450880, !dbg !50
%21 = inttoptr i64 %20 to i8*, !dbg !50
%22 = load i8* %21, !dbg !50
%23 = icmp ne i8 %22, 0, !dbg !50
br i1 %23, label %24, label %30, !dbg !50
; <label>:24 ; preds = %5
%25 = and i64 %18, 7, !dbg !50
%26 = add i64 %25, 3, !dbg !50
%27 = trunc i64 %26 to i8, !dbg !50
%28 = icmp sge i8 %27, %22, !dbg !50
br i1 %28, label %29, label %30
; <label>:29 ; preds = %24
call void @__asan_report_store4(i64 %18), !dbg !50
call void asm sideeffect "", ""()
unreachable
; <label>:30 ; preds = %24, %5
store i32 0, i32* %i.i, align 4, !dbg !50, !tbaa !41
store i64 1172321806, i64* %9, !dbg !52
%31 = icmp ne i64 %6, %0, !dbg !52
br i1 %31, label %32, label %39, !dbg !52
; <label>:32 ; preds = %30
%33 = add i64 %15, 0, !dbg !52
%34 = inttoptr i64 %33 to i64*, !dbg !52
store i64 -723401728380766731, i64* %34, !dbg !52
%35 = add i64 %6, 56, !dbg !52
%36 = inttoptr i64 %35 to i64*, !dbg !52
%37 = load i64* %36, !dbg !52
%38 = inttoptr i64 %37 to i8*, !dbg !52
store i8 0, i8* %38, !dbg !52
br label %42, !dbg !52
; <label>:39 ; preds = %30
%40 = add i64 %15, 0, !dbg !52
%41 = inttoptr i64 %40 to i64*, !dbg !52
store i64 0, i64* %41, !dbg !52
br label %42, !dbg !52
; <label>:42 ; preds = %39, %32
ret void, !dbg !52
}
declare i32 @_ZN1A5m_fn1Ev(%struct.A*) #2
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata) #3
define internal void @asan.module_ctor() {
tail call void @__asan_init_v3()
ret void
}
declare void @__asan_init_v3()
declare void @__asan_report_load1(i64)
declare void @__asan_load1(i64)
declare void @__asan_report_load2(i64)
declare void @__asan_load2(i64)
declare void @__asan_report_load4(i64)
declare void @__asan_load4(i64)
declare void @__asan_report_load8(i64)
declare void @__asan_load8(i64)
declare void @__asan_report_load16(i64)
declare void @__asan_load16(i64)
declare void @__asan_report_store1(i64)
declare void @__asan_store1(i64)
declare void @__asan_report_store2(i64)
declare void @__asan_store2(i64)
declare void @__asan_report_store4(i64)
declare void @__asan_store4(i64)
declare void @__asan_report_store8(i64)
declare void @__asan_store8(i64)
declare void @__asan_report_store16(i64)
declare void @__asan_store16(i64)
declare void @__asan_report_load_n(i64, i64)
declare void @__asan_report_store_n(i64, i64)
declare void @__asan_loadN(i64, i64)
declare void @__asan_storeN(i64, i64)
declare i8* @__asan_memmove(i8*, i8*, i64)
declare i8* @__asan_memcpy(i8*, i8*, i64)
declare i8* @__asan_memset(i8*, i32, i64)
declare void @__asan_handle_no_return()
declare void @__sanitizer_cov()
declare void @__sanitizer_ptr_cmp(i64, i64)
declare void @__sanitizer_ptr_sub(i64, i64)
declare i64 @__asan_stack_malloc_0(i64, i64)
declare void @__asan_stack_free_0(i64, i64, i64)
declare i64 @__asan_stack_malloc_1(i64, i64)
declare void @__asan_stack_free_1(i64, i64, i64)
declare i64 @__asan_stack_malloc_2(i64, i64)
declare void @__asan_stack_free_2(i64, i64, i64)
declare i64 @__asan_stack_malloc_3(i64, i64)
declare void @__asan_stack_free_3(i64, i64, i64)
declare i64 @__asan_stack_malloc_4(i64, i64)
declare void @__asan_stack_free_4(i64, i64, i64)
declare i64 @__asan_stack_malloc_5(i64, i64)
declare void @__asan_stack_free_5(i64, i64, i64)
declare i64 @__asan_stack_malloc_6(i64, i64)
declare void @__asan_stack_free_6(i64, i64, i64)
declare i64 @__asan_stack_malloc_7(i64, i64)
declare void @__asan_stack_free_7(i64, i64, i64)
declare i64 @__asan_stack_malloc_8(i64, i64)
declare void @__asan_stack_free_8(i64, i64, i64)
declare i64 @__asan_stack_malloc_9(i64, i64)
declare void @__asan_stack_free_9(i64, i64, i64)
declare i64 @__asan_stack_malloc_10(i64, i64)
declare void @__asan_stack_free_10(i64, i64, i64)
declare void @__asan_poison_stack_memory(i64, i64)
declare void @__asan_unpoison_stack_memory(i64, i64)
declare void @__asan_before_dynamic_init(i64)
declare void @__asan_after_dynamic_init()
declare void @__asan_register_globals(i64, i64)
declare void @__asan_unregister_globals(i64, i64)
declare void @__sanitizer_cov_module_init(i64)
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" }
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" }
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" }
attributes #3 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!36, !37}
!llvm.ident = !{!38}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 true, metadata !"", i32 0, metadata !2, metadata !3, metadata !21, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/<stdin>] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"<stdin>", metadata !"/tmp/dbginfo"}
!2 = metadata !{}
!3 = metadata !{metadata !4, metadata !14}
!4 = metadata !{i32 786451, metadata !5, null, metadata !"C", i32 10, i64 64, i64 32, i32 0, i32 0, null, metadata !6, i32 0, null, null, metadata !"_ZTS1C"} ; [ DW_TAG_structure_type ] [C] [line 10, size 64, align 32, offset 0] [def] [from ]
!5 = metadata !{metadata !"incorrect-variable-debug-loc.cpp", metadata !"/tmp/dbginfo"}
!6 = metadata !{metadata !7, metadata !9, metadata !10}
!7 = metadata !{i32 786445, metadata !5, metadata !"_ZTS1C", metadata !"j", i32 12, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [j] [line 12, size 32, align 32, offset 0] [from int]
!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!9 = metadata !{i32 786445, metadata !5, metadata !"_ZTS1C", metadata !"b", i32 13, i64 32, i64 32, i64 32, i32 0, metadata !"_ZTS1B"} ; [ DW_TAG_member ] [b] [line 13, size 32, align 32, offset 32] [from _ZTS1B]
!10 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1C", metadata !"m_fn3", metadata !"m_fn3", metadata !"_ZN1C5m_fn3Ev", i32 11, metadata !11, i1 false, i1 false, i32 0, i32 0, null, i32 256, i1 true, null, null, i32 0, null, i32 11} ; [ DW_TAG_subprogram ] [line 11] [m_fn3]
!11 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !12, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!12 = metadata !{null, metadata !13}
!13 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 1088, metadata !"_ZTS1C"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from _ZTS1C]
!14 = metadata !{i32 786451, metadata !5, null, metadata !"B", i32 5, i64 32, i64 32, i32 0, i32 0, null, metadata !15, i32 0, null, null, metadata !"_ZTS1B"} ; [ DW_TAG_structure_type ] [B] [line 5, size 32, align 32, offset 0] [def] [from ]
!15 = metadata !{metadata !16, metadata !17}
!16 = metadata !{i32 786445, metadata !5, metadata !"_ZTS1B", metadata !"i", i32 7, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [i] [line 7, size 32, align 32, offset 0] [from int]
!17 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1B", metadata !"m_fn2", metadata !"m_fn2", metadata !"_ZN1B5m_fn2Ev", i32 6, metadata !18, i1 false, i1 false, i32 0, i32 0, null, i32 256, i1 true, null, null, i32 0, null, i32 6} ; [ DW_TAG_subprogram ] [line 6] [m_fn2]
!18 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !19, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!19 = metadata !{null, metadata !20}
!20 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 1088, metadata !"_ZTS1B"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from _ZTS1B]
!21 = metadata !{metadata !22, metadata !28, metadata !32}
!22 = metadata !{i32 786478, metadata !5, metadata !23, metadata !"fn1", metadata !"fn1", metadata !"_Z3fn1v", i32 16, metadata !24, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 ()* @_Z3fn1v, null, null, metadata !26, i32 16} ; [ DW_TAG_subprogram ] [line 16] [def] [fn1]
!23 = metadata !{i32 786473, metadata !5} ; [ DW_TAG_file_type ] [/tmp/dbginfo/incorrect-variable-debug-loc.cpp]
!24 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !25, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!25 = metadata !{metadata !8}
!26 = metadata !{metadata !27}
!27 = metadata !{i32 786688, metadata !22, metadata !"A", metadata !23, i32 17, metadata !"_ZTS1C", i32 0, i32 0} ; [ DW_TAG_auto_variable ] [A] [line 17]
!28 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1C", metadata !"m_fn3", metadata !"m_fn3", metadata !"_ZN1C5m_fn3Ev", i32 21, metadata !11, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void (%struct.C*)* @_ZN1C5m_fn3Ev, null, metadata !10, metadata !29, i32 21} ; [ DW_TAG_subprogram ] [line 21] [def] [m_fn3]
!29 = metadata !{metadata !30}
!30 = metadata !{i32 786689, metadata !28, metadata !"this", null, i32 16777216, metadata !31, i32 1088, i32 0} ; [ DW_TAG_arg_variable ] [this] [line 0]
!31 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !"_ZTS1C"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from _ZTS1C]
!32 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1B", metadata !"m_fn2", metadata !"m_fn2", metadata !"_ZN1B5m_fn2Ev", i32 6, metadata !18, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, null, null, metadata !17, metadata !33, i32 6} ; [ DW_TAG_subprogram ] [line 6] [def] [m_fn2]
!33 = metadata !{metadata !34}
!34 = metadata !{i32 786689, metadata !32, metadata !"this", null, i32 16777216, metadata !35, i32 1088, i32 0} ; [ DW_TAG_arg_variable ] [this] [line 0]
!35 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !"_ZTS1B"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from _ZTS1B]
!36 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!37 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
!38 = metadata !{metadata !"clang version 3.5.0 "}
!39 = metadata !{i32 6, i32 0, metadata !32, metadata !40}
!40 = metadata !{i32 18, i32 0, metadata !22, null}
!41 = metadata !{metadata !42, metadata !43, i64 0}
!42 = metadata !{metadata !"_ZTS1B", metadata !43, i64 0}
!43 = metadata !{metadata !"int", metadata !44, i64 0}
!44 = metadata !{metadata !"omnipotent char", metadata !45, i64 0}
!45 = metadata !{metadata !"Simple C/C++ TBAA"}
!46 = metadata !{i32 17, i32 0, metadata !22, null}
!47 = metadata !{i32 19, i32 0, metadata !22, null}
!48 = metadata !{i32 0, i32 0, metadata !28, null}
!49 = metadata !{i32 22, i32 0, metadata !28, null}
!50 = metadata !{i32 6, i32 0, metadata !32, metadata !51}
!51 = metadata !{i32 23, i32 0, metadata !28, null}
!52 = metadata !{i32 24, i32 0, metadata !28, null}
|
