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
| # RUN: llc -o - %s -mtriple=thumbv7-apple-ios -start-after=patchable-function | FileCheck %s
# RUN: llc -o - %s -mtriple=thumbv6-apple-ios -start-after=patchable-function | FileCheck %s
# struct A {
# A();
# virtual ~A();
# };
# struct B : A {
# B();
# virtual ~B();
# };
# B::B() {}
# CHECK: __ZN1BC1Ev:
# CHECK: .loc 1 9 0 prologue_end
# CHECK-NOT: .loc 1 0 0 prologue_end
#
# The location of the prologue_end marker should not be affected by the presence
# of CFI instructions.
--- |
%struct.B = type { %struct.A }
%struct.A = type { i32 (...)** }
@_ZTV1B = external unnamed_addr constant [4 x i8*]
; Function Attrs: nounwind
define %struct.B* @_ZN1BC2Ev(%struct.B* %this) unnamed_addr #0 align 2 !dbg !31 {
entry:
tail call void @llvm.dbg.value(metadata %struct.B* %this, metadata !33, metadata !DIExpression()), !dbg !35
%0 = bitcast %struct.B* %this to %struct.A*, !dbg !36
%call = tail call %struct.A* @_ZN1AC2Ev(%struct.A* %0) #0, !dbg !36
%1 = bitcast %struct.B* %this to i32 (...)***, !dbg !36
store i32 (...)** bitcast (i8** getelementptr inbounds ([4 x i8*], [4 x i8*]* @_ZTV1B, i32 0, i32 2) to i32 (...)**), i32 (...)*** %1, align 4, !dbg !36, !tbaa !37
ret %struct.B* %this, !dbg !36
}
declare %struct.A* @_ZN1AC2Ev(%struct.A*)
; Function Attrs: nounwind
define %struct.B* @_ZN1BC1Ev(%struct.B* %this) unnamed_addr #0 align 2 !dbg !40 {
entry:
tail call void @llvm.dbg.value(metadata %struct.B* %this, metadata !42, metadata !DIExpression()), !dbg !43
tail call void @llvm.dbg.value(metadata %struct.B* %this, metadata !33, metadata !DIExpression()) #0, !dbg !44
%0 = bitcast %struct.B* %this to %struct.A*, !dbg !46
%call.i = tail call %struct.A* @_ZN1AC2Ev(%struct.A* %0) #0, !dbg !46
%1 = bitcast %struct.B* %this to i32 (...)***, !dbg !46
store i32 (...)** bitcast (i8** getelementptr inbounds ([4 x i8*], [4 x i8*]* @_ZTV1B, i32 0, i32 2) to i32 (...)**), i32 (...)*** %1, align 4, !dbg !46, !tbaa !37
ret %struct.B* %this, !dbg !45
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
declare void @_Unwind_SjLj_Register({ i8*, i32, [4 x i32], i8*, i8*, [5 x i8*] }*)
declare void @_Unwind_SjLj_Unregister({ i8*, i32, [4 x i32], i8*, i8*, [5 x i8*] }*)
; Function Attrs: nounwind readnone
declare i8* @llvm.frameaddress(i32) #2
; Function Attrs: nounwind
declare i8* @llvm.stacksave() #0
; Function Attrs: nounwind
declare void @llvm.stackrestore(i8*) #0
; Function Attrs: nounwind
declare void @llvm.eh.sjlj.setup.dispatch() #0
; Function Attrs: nounwind readnone
declare i8* @llvm.eh.sjlj.lsda() #2
; Function Attrs: nounwind readnone
declare void @llvm.eh.sjlj.callsite(i32) #2
; Function Attrs: nounwind
declare void @llvm.eh.sjlj.functioncontext(i8*) #0
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**) #0
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!26, !27, !28, !29}
!llvm.ident = !{!30}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.6.0 (trunk 224279) (llvm/trunk 224283)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "<stdin>", directory: "")
!2 = !{}
!3 = !{!4, !8}
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "B", file: !5, line: 5, size: 32, align: 32, elements: !6, vtableHolder: !8, identifier: "_ZTS1B")
!5 = !DIFile(filename: "test1.cpp", directory: "")
!6 = !{!7, !21, !25}
!7 = !DIDerivedType(tag: DW_TAG_inheritance, scope: !4, baseType: !8)
!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !5, line: 1, size: 32, align: 32, elements: !9, vtableHolder: !8, identifier: "_ZTS1A")
!9 = !{!10, !16, !20}
!10 = !DIDerivedType(tag: DW_TAG_member, name: "_vptr$A", scope: !5, file: !5, baseType: !11, size: 32, flags: DIFlagArtificial)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 32)
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, name: "__vtbl_ptr_type", baseType: !13, size: 32)
!13 = !DISubroutineType(types: !14)
!14 = !{!15}
!15 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!16 = !DISubprogram(name: "A", scope: !8, file: !5, line: 2, type: !17, isLocal: false, isDefinition: false, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true)
!17 = !DISubroutineType(types: !18)
!18 = !{null, !19}
!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 32, align: 32, flags: DIFlagArtificial | DIFlagObjectPointer)
!20 = !DISubprogram(name: "~A", scope: !8, file: !5, line: 3, type: !17, isLocal: false, isDefinition: false, scopeLine: 3, containingType: !8, virtuality: DW_VIRTUALITY_virtual, virtualIndex: 0, flags: DIFlagPrototyped, isOptimized: true)
!21 = !DISubprogram(name: "B", scope: !4, file: !5, line: 6, type: !22, isLocal: false, isDefinition: false, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true)
!22 = !DISubroutineType(types: !23)
!23 = !{null, !24}
!24 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 32, align: 32, flags: DIFlagArtificial | DIFlagObjectPointer)
!25 = !DISubprogram(name: "~B", scope: !4, file: !5, line: 7, type: !22, isLocal: false, isDefinition: false, scopeLine: 7, containingType: !4, virtuality: DW_VIRTUALITY_virtual, virtualIndex: 0, flags: DIFlagPrototyped, isOptimized: true)
!26 = !{i32 2, !"Dwarf Version", i32 4}
!27 = !{i32 2, !"Debug Info Version", i32 3}
!28 = !{i32 1, !"wchar_size", i32 4}
!29 = !{i32 1, !"min_enum_size", i32 4}
!30 = !{!"clang version 3.6.0 (trunk 224279) (llvm/trunk 224283)"}
!31 = distinct !DISubprogram(name: "B", linkageName: "_ZN1BC2Ev", scope: !4, file: !5, line: 9, type: !22, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !21, retainedNodes: !32)
!32 = !{!33}
!33 = !DILocalVariable(name: "this", arg: 1, scope: !31, type: !34, flags: DIFlagArtificial | DIFlagObjectPointer)
!34 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 32, align: 32)
!35 = !DILocation(line: 0, scope: !31)
!36 = !DILocation(line: 9, scope: !31)
!37 = !{!38, !38, i64 0}
!38 = !{!"vtable pointer", !39, i64 0}
!39 = !{!"Simple C/C++ TBAA"}
!40 = distinct !DISubprogram(name: "B", linkageName: "_ZN1BC1Ev", scope: !4, file: !5, line: 9, type: !22, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !21, retainedNodes: !41)
!41 = !{!42}
!42 = !DILocalVariable(name: "this", arg: 1, scope: !40, type: !34, flags: DIFlagArtificial | DIFlagObjectPointer)
!43 = !DILocation(line: 0, scope: !40)
!44 = !DILocation(line: 0, scope: !31, inlinedAt: !45)
!45 = !DILocation(line: 9, scope: !40)
!46 = !DILocation(line: 9, scope: !31, inlinedAt: !45)
...
---
name: _ZN1BC2Ev
alignment: 2
liveins:
- { reg: '$r0' }
frameInfo:
stackSize: 8
maxAlignment: 4
adjustsStack: true
hasCalls: true
maxCallFrameSize: 0
stack:
- { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: default,
callee-saved-register: '$lr', callee-saved-restored: false }
- { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: default,
callee-saved-register: '$r4' }
body: |
bb.0.entry:
frame-setup tPUSH 14, $noreg, killed $r4, killed $lr, implicit-def $sp, implicit $sp
frame-setup CFI_INSTRUCTION def_cfa_offset 8
frame-setup CFI_INSTRUCTION offset $lr, -4
frame-setup CFI_INSTRUCTION offset $r4, -8
DBG_VALUE debug-use $r0, debug-use $noreg, !33, !DIExpression(), debug-location !35
$r4 = tMOVr $r0, 14, $noreg
DBG_VALUE debug-use $r4, debug-use $noreg, !33, !DIExpression(), debug-location !35
tBL 14, $noreg, @_ZN1AC2Ev, csr_ios, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def dead $r0, debug-location !36
$r0 = t2MOVi16_ga_pcrel target-flags(arm-lo16, arm-nonlazy) @_ZTV1B, 0, debug-location !36
$r0 = t2MOVTi16_ga_pcrel killed $r0, target-flags(arm-hi16, arm-nonlazy) @_ZTV1B, 0, debug-location !36
$r0 = tPICADD killed $r0, 0, debug-location !36
renamable $r0 = tLDRi killed renamable $r0, 0, 14, $noreg, debug-location !36 :: (load 4 from got)
renamable $r0, dead $cpsr = nuw tADDi8 killed renamable $r0, 8, 14, $noreg, debug-location !36
tSTRi killed renamable $r0, renamable $r4, 0, 14, $noreg, debug-location !36 :: (store 4 into %ir.1, !tbaa !37)
$r0 = tMOVr killed $r4, 14, $noreg, debug-location !36
tPOP_RET 14, $noreg, def $r4, def $pc, implicit killed $r0, debug-location !36
...
---
name: _ZN1BC1Ev
alignment: 2
liveins:
- { reg: '$r0' }
frameInfo:
stackSize: 8
maxAlignment: 4
adjustsStack: true
hasCalls: true
maxCallFrameSize: 0
stack:
- { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: default,
callee-saved-register: '$lr', callee-saved-restored: false }
- { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: default,
callee-saved-register: '$r4' }
body: |
bb.0.entry:
frame-setup tPUSH 14, $noreg, killed $r4, killed $lr, implicit-def $sp, implicit $sp
frame-setup CFI_INSTRUCTION def_cfa_offset 8
frame-setup CFI_INSTRUCTION offset $lr, -4
frame-setup CFI_INSTRUCTION offset $r4, -8
DBG_VALUE debug-use $r0, debug-use $noreg, !42, !DIExpression(), debug-location !43
DBG_VALUE debug-use $r0, debug-use $noreg, !33, !DIExpression(), debug-location !44
$r4 = tMOVr $r0, 14, $noreg
DBG_VALUE debug-use $r4, debug-use $noreg, !33, !DIExpression(), debug-location !44
DBG_VALUE debug-use $r4, debug-use $noreg, !42, !DIExpression(), debug-location !43
tBL 14, $noreg, @_ZN1AC2Ev, csr_ios, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def dead $r0, debug-location !46
$r0 = t2MOVi16_ga_pcrel target-flags(arm-lo16, arm-nonlazy) @_ZTV1B, 0, debug-location !46
$r0 = t2MOVTi16_ga_pcrel killed $r0, target-flags(arm-hi16, arm-nonlazy) @_ZTV1B, 0, debug-location !46
$r0 = tPICADD killed $r0, 0, debug-location !46
renamable $r0 = tLDRi killed renamable $r0, 0, 14, $noreg, debug-location !46 :: (load 4 from got)
renamable $r0, dead $cpsr = nuw tADDi8 killed renamable $r0, 8, 14, $noreg, debug-location !46
tSTRi killed renamable $r0, renamable $r4, 0, 14, $noreg, debug-location !46 :: (store 4 into %ir.1, !tbaa !37)
$r0 = tMOVr killed $r4, 14, $noreg, debug-location !45
tPOP_RET 14, $noreg, def $r4, def $pc, implicit killed $r0, debug-location !45
...
|