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
|
# RUN: llc %s -o - -run-pass=livedebugvalues -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=CHECK
# RUN: llc %s -o - -start-before=livedebugvalues -filetype=obj -mtriple=x86_64-unknown-unknown | llvm-dwarfdump - | FileCheck %s --check-prefix=RANGES
# Check that livedebugvalues does the right thing when register and constant
# DBG_VALUEs interact, and that their ranges are correctly terminated by the
# debug printing backend.
--- |
; All these IR functions are duds, see the MIR below.
source_filename = "<stdin>"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define i32 @foo(i32* %bees, i32* %output) !dbg !4 {
entry:
br i1 undef, label %bb1, label %bb1
bb1:
br label %bb3
bb2:
br label %bb3
bb3:
ret i32 0
}
define i32 @bar(i32* %bees, i32* %output) !dbg !40 {
entry:
br i1 undef, label %bb1, label %bb1
bb1:
br label %bb3
bb2:
br label %bb3
bb3:
ret i32 0
}
define i32 @baz(i32* %bees, i32* %output) !dbg !80 {
entry:
br i1 undef, label %bb1, label %bb1
bb1:
br label %bb3
bb2:
br label %bb3
bb3:
ret i32 0
}
define i32 @qux(i32* %bees, i32* %output) !dbg !120 {
entry:
br i1 undef, label %bb1, label %bb1
bb1:
br label %bb3
bb2:
br label %bb3
bb3:
ret i32 0
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata)
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata)
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**)
!llvm.module.flags = !{!0, !100}
!llvm.dbg.cu = !{!1}
!100 = !{i32 2, !"Dwarf Version", i32 4}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "beards", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
!2 = !DIFile(filename: "bees.cpp", directory: ".")
!3 = !DILocalVariable(name: "flannel", scope: !4, file: !2, line: 1, type: !16)
!4 = distinct !DISubprogram(name: "nope", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
!5 = !DILocation(line: 0, scope: !4)
!6 = !DILocation(line: 1, scope: !4)
!7 = !DILocation(line: 2, scope: !4)
!8 = !DILocation(line: 4, scope: !4)
!9 = !DILocation(line: 5, scope: !4)
!10 = !DILocation(line: 6, scope: !4)
!11 = !DILocation(line: 7, scope: !4)
!12 = !DILocation(line: 8, scope: !4)
!13 = !{!3}
!14 = !DISubroutineType(types: !15)
!15 = !{!16}
!16 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!40 = distinct !DISubprogram(name: "bar", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
!41 = !DILocalVariable(name: "towel", scope: !40, file: !2, line: 1, type: !16)
!42 = !DILocation(line: 40, scope: !40)
!80 = distinct !DISubprogram(name: "baz", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
!81 = !DILocalVariable(name: "socks", scope: !80, file: !2, line: 1, type: !16)
!82 = !DILocation(line: 40, scope: !80)
!120 = distinct !DISubprogram(name: "qux", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
!121 = !DILocalVariable(name: "shoes", scope: !120, file: !2, line: 1, type: !16)
!122 = !DILocation(line: 40, scope: !120)
...
---
name: foo
alignment: 16
tracksRegLiveness: true
registers: []
liveins:
- { reg: '$rdi', virtual-reg: '' }
body: |
; Two DBG_VALUEs for eax merge into bb3, check that livedebugvalues propagates
; the location.
; CHECK-LABEL: name: foo
; CHECK-LABEL: bb.1.bb1
; CHECK: $eax = MOV32rr
; CHECK-NEXT: DBG_VALUE $eax
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.2.bb2
; CHECK: $eax = ADD32ri8
; CHECK-NEXT: DBG_VALUE $eax
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.3.bb3
; CHECK: DBG_VALUE $eax
; Test for there being a location-list gap between bb1 and bb2, as the
; variable does not have a location over the ADD32ri. The range should also
; extend over the final bb.
; RANGES-LABEL: DW_TAG_subprogram
; RANGES: DW_AT_high_pc (0x[[NOPEHIGHPC:[0-9a-f]+]])
; RANGES-LABEL: DW_AT_name ("nope")
; RANGES: DW_AT_location (0x{{[0-9a-f]+}}
; RANGES-NEXT: [0x{{[0-9a-f]+}}, 0x[[NOPEADDR:[0-9a-f]+]]): DW_OP_reg0 RAX
; RANGES-NEXT: [
; RANGES-NOT: 0x[[NOPEADDR]]
; RANGES-SAME: , 0x[[NOPEHIGHPC]]): DW_OP_reg0 RAX
bb.0.entry:
successors: %bb.1, %bb.2
liveins: $rdi
$ecx = XOR32rr undef $ecx, undef $ecx, implicit-def $eflags
JCC_1 %bb.1, 2, implicit killed $eflags
JMP_1 %bb.2
bb.1.bb1 (align 4):
successors: %bb.3
liveins: $ecx, $rdi
$eax = MOV32rr killed $ecx, implicit-def $rax
DBG_VALUE $eax, $noreg, !3, !DIExpression(), debug-location !8
JMP_1 %bb.3
bb.2.bb2:
successors: %bb.3
liveins: $rax
$eax = ADD32ri8 $eax, 3, implicit-def dead $eflags, implicit killed $rax, implicit-def $rax
DBG_VALUE $eax, $noreg, !3, !DIExpression(), debug-location !8
JMP_1 %bb.3
bb.3.bb3:
liveins: $rax
RET64 $eax, debug-location !9
...
---
name: bar
alignment: 16
tracksRegLiveness: true
registers: []
liveins:
- { reg: '$rdi', virtual-reg: '' }
body: |
; Two DBG_VALUEs, one for eax, the other for zero, merge into bb3. Check that
; livedebugvalues does not propagate anything.
; the location.
; CHECK-LABEL: name: bar
; CHECK-LABEL: bb.1.bb1
; CHECK: $eax = MOV32rr
; CHECK-NEXT: DBG_VALUE 0
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.2.bb2
; CHECK: $eax = ADD32ri8
; CHECK-NEXT: DBG_VALUE $eax
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.3.bb3
; CHECK-NOT: DBG_VALUE
; Test for there being a location-list gap between bb1 and bb2, the variable
; should not have a location over the ADD32ri. The range of the last entry
; should not cover the last block.
; RANGES-LABEL: DW_TAG_subprogram
; RANGES: DW_AT_high_pc (0x[[BARHIGHPC:[0-9a-f]+]])
; RANGES-LABEL: DW_AT_name ("bar")
; RANGES: DW_AT_location (0x{{[0-9a-f]+}}
; RANGES-NEXT: [0x{{[0-9a-f]+}}, 0x[[BARADDR:[0-9a-f]+]]): DW_OP_consts +0, DW_OP_stack_value
; RANGES-NEXT: [
; RANGES-NOT: 0x[[BARADDR]]
; RANGES-NOT: 0x[[BARHIGHPC]]
; RANGES-SAME: ): DW_OP_reg0 RAX
bb.0.entry:
successors: %bb.1, %bb.2
liveins: $rdi
$ecx = XOR32rr undef $ecx, undef $ecx, implicit-def $eflags
JCC_1 %bb.1, 2, implicit killed $eflags
JMP_1 %bb.2
bb.1.bb1 (align 4):
successors: %bb.3
liveins: $ecx, $rdi
$eax = MOV32rr killed $ecx, implicit-def $rax
DBG_VALUE 0, $noreg, !41, !DIExpression(), debug-location !42
JMP_1 %bb.3
bb.2.bb2:
successors: %bb.3
liveins: $rax
$eax = ADD32ri8 $eax, 3, implicit-def dead $eflags, implicit killed $rax, implicit-def $rax
DBG_VALUE $eax, $noreg, !41, !DIExpression(), debug-location !42
JMP_1 %bb.3
bb.3.bb3:
liveins: $rax
RET64 $eax, debug-location !42
...
---
name: baz
alignment: 16
tracksRegLiveness: true
registers: []
liveins:
- { reg: '$rdi', virtual-reg: '' }
body: |
; Two DBG_VALUEs, one for zero, the other for eax, merge into bb3. Check that
; livedebugvalues does not propagate anything.
; the location.
; CHECK-LABEL: name: baz
; CHECK-LABEL: bb.1.bb1
; CHECK: $eax = MOV32rr
; CHECK-NEXT: DBG_VALUE $eax
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.2.bb2
; CHECK: $eax = ADD32ri8
; CHECK-NEXT: DBG_VALUE 0
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.3.bb3
; CHECK-NOT: DBG_VALUE
; Test for there being a location-list gap between bb1 and bb2, the variable
; should not have a location over the ADD32ri. The range of the last item
; should not cover the last block.
; RANGES-LABEL: DW_TAG_subprogram
; RANGES: DW_AT_high_pc (0x[[BAZHIGHPC:[0-9a-f]+]])
; RANGES-LABEL: DW_AT_name ("baz")
; RANGES: DW_AT_location (0x{{[0-9a-f]+}}
; RANGES-NEXT: [0x{{[0-9a-f]+}}, 0x[[BAZADDR:[0-9a-f]+]]): DW_OP_reg0 RAX
; RANGES-NEXT: [
; RANGES-NOT: 0x[[BAZADDR]]
; RANGES-NOT: 0x[[BAZHIGHPC]]
; RANGES-SAME: ): DW_OP_consts +0, DW_OP_stack_value
bb.0.entry:
successors: %bb.1, %bb.2
liveins: $rdi
$ecx = XOR32rr undef $ecx, undef $ecx, implicit-def $eflags
JCC_1 %bb.1, 2, implicit killed $eflags
JMP_1 %bb.2
bb.1.bb1 (align 4):
successors: %bb.3
liveins: $ecx, $rdi
$eax = MOV32rr killed $ecx, implicit-def $rax
DBG_VALUE $eax, $noreg, !81, !DIExpression(), debug-location !82
JMP_1 %bb.3
bb.2.bb2:
successors: %bb.3
liveins: $rax
$eax = ADD32ri8 $eax, 3, implicit-def dead $eflags, implicit killed $rax, implicit-def $rax
DBG_VALUE 0, $noreg, !81, !DIExpression(), debug-location !82
JMP_1 %bb.3
bb.3.bb3:
liveins: $rax
RET64 $eax, debug-location !82
...
---
name: qux
alignment: 16
tracksRegLiveness: true
registers: []
liveins:
- { reg: '$rdi', virtual-reg: '' }
body: |
; Two DBG_VALUEs for zero merging into bb3, Check that livedebugvalues does
; propagate the zero into the merging block.
; CHECK-LABEL: name: qux
; CHECK-LABEL: bb.1.bb1
; CHECK: $eax = MOV32rr
; CHECK-NEXT: DBG_VALUE 0
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.2.bb2
; CHECK: $eax = ADD32ri8
; CHECK-NEXT: DBG_VALUE 0
; CHECK-NEXT: JMP_1 %bb.3
; CHECK-LABEL: bb.3.bb3
; CHECK: DBG_VALUE 0
; Test for there being a location-list gap between bb1 and bb2, the variable
; should not have a location over the ADD32ri. The final entry should cover
; the final block.
; RANGES-LABEL: DW_TAG_subprogram
; RANGES: DW_AT_high_pc (0x[[QUXHIGHPC:[0-9a-f]+]])
; RANGES-LABEL: DW_AT_name ("qux")
; RANGES: DW_AT_location (0x{{[0-9a-f]+}}
; RANGES-NEXT: [0x{{[0-9a-f]+}}, 0x[[QUXADDR:[0-9a-f]+]]): DW_OP_consts +0, DW_OP_stack_value
; RANGES-NOT: 0x[[QUXADDR]]
; RANGES-NEXT: [0x{{[0-9a-f]+}}, 0x[[QUXHIGHPC]]): DW_OP_consts +0, DW_OP_stack_value
bb.0.entry:
successors: %bb.1, %bb.2
liveins: $rdi
$ecx = XOR32rr undef $ecx, undef $ecx, implicit-def $eflags
JCC_1 %bb.1, 2, implicit killed $eflags
JMP_1 %bb.2
bb.1.bb1 (align 4):
successors: %bb.3
liveins: $ecx, $rdi
$eax = MOV32rr killed $ecx, implicit-def $rax
DBG_VALUE 0, $noreg, !121, !DIExpression(), debug-location !122
JMP_1 %bb.3
bb.2.bb2:
successors: %bb.3
liveins: $rax
$eax = ADD32ri8 $eax, 3, implicit-def dead $eflags, implicit killed $rax, implicit-def $rax
DBG_VALUE 0, $noreg, !121, !DIExpression(), debug-location !122
JMP_1 %bb.3
bb.3.bb3:
liveins: $rax
RET64 $eax, debug-location !122
...
|
