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
|
# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
# RUN: | llvm-dwarfdump -v --name local* --regex - | FileCheck %s
#
# Generated with opt -sroa, llc -stop-after=livedebugvalues, with some metadata
# removed by hand:
# long a, b, c;
# long funone() {
# unsigned localone;
# if (c)
# return b;
# // Location should start here.
# localone = 0;
# return a;
# }
#
# short funtwo() {
# union {
# char b[2];
# short c;
# } localtwo;
# {
# // Location should start here.
# memcpy(localtwo.b, 0, 2);
# }
# return localtwo.c;
# }
#
# Check that the local variables each have a location range which reflects the
# fact that they're both unavailable at the start of the functions.
#
# CHECK: DW_TAG_variable [
# CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset]
# CHECK-NEXT: [0x{{[0-9a-z]+}}, 0x{{[0-9a-z]+}})
# CHECK-NEXT: DW_AT_name {{.*}} = "localone"
#
# CHECK: DW_TAG_variable [
# CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset]
# CHECK-NEXT: [0x{{[0-9a-z]+}}, 0x{{[0-9a-z]+}})
# CHECK-NEXT: DW_AT_name {{.*}} = "localtwo"
--- |
target triple = "x86_64-unknown-linux-gnu"
@c = dso_local global i64 0, align 8, !dbg !0
@b = dso_local global i64 0, align 8, !dbg !9
@a = dso_local global i64 0, align 8, !dbg !6
define dso_local i64 @funone() !dbg !15 {
entry:
%0 = load i64, i64* @c, align 8, !dbg !21
%tobool = icmp ne i64 %0, 0, !dbg !21
br i1 %tobool, label %if.then, label %if.end, !dbg !27
if.then: ; preds = %entry
%1 = load i64, i64* @b, align 8, !dbg !21
br label %cleanup, !dbg !21
if.end: ; preds = %entry
call void @llvm.dbg.value(metadata i32 0, metadata !19, metadata !DIExpression()), !dbg !27
%2 = load i64, i64* @a, align 8, !dbg !27
br label %cleanup, !dbg !27
cleanup: ; preds = %if.end, %if.then
%retval.0 = phi i64 [ %1, %if.then ], [ %2, %if.end ], !dbg !27
ret i64 %retval.0, !dbg !27
}
define dso_local signext i16 @funtwo() !dbg !34 {
entry:
%localtwo.sroa.0.0.copyload = load i16, i16* null, align 1, !dbg !48
call void @llvm.dbg.value(metadata i16 %localtwo.sroa.0.0.copyload, metadata !39, metadata !DIExpression()), !dbg !51
ret i16 %localtwo.sroa.0.0.copyload, !dbg !51
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!11, !12, !13}
!llvm.ident = !{!14}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.c", directory: "/")
!4 = !{}
!5 = !{!6, !9, !0}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
!8 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
!10 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
!11 = !{i32 7, !"Dwarf Version", i32 4}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"wchar_size", i32 4}
!14 = !{!"clang version 11.0.0"}
!15 = distinct !DISubprogram(name: "funone", scope: !3, file: !3, line: 3, type: !16, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !18)
!16 = !DISubroutineType(types: !17)
!17 = !{!8}
!18 = !{!19}
!19 = !DILocalVariable(name: "localone", scope: !15, file: !3, line: 4, type: !20)
!20 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
!21 = !DILocation(line: 5, column: 7, scope: !22)
!22 = distinct !DILexicalBlock(scope: !15, file: !3, line: 5, column: 7)
!27 = !DILocation(line: 5, column: 7, scope: !15)
!34 = distinct !DISubprogram(name: "funtwo", scope: !3, file: !3, line: 13, type: !35, scopeLine: 13, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38)
!35 = !DISubroutineType(types: !36)
!36 = !{!37}
!37 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
!38 = !{!39}
!39 = !DILocalVariable(name: "localtwo", scope: !34, file: !3, line: 17, type: !40)
!40 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !34, file: !3, line: 14, size: 16, elements: !41)
!41 = !{!42, !47}
!42 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !40, file: !3, line: 15, baseType: !43, size: 16)
!43 = !DICompositeType(tag: DW_TAG_array_type, baseType: !44, size: 16, elements: !45)
!44 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!45 = !{!46}
!46 = !DISubrange(count: 2)
!47 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !40, file: !3, line: 16, baseType: !37, size: 16)
!48 = !DILocation(line: 20, column: 5, scope: !49)
!49 = distinct !DILexicalBlock(scope: !34, file: !3, line: 18, column: 3)
!51 = !DILocation(line: 22, column: 3, scope: !34)
...
---
name: funone
body: |
bb.0.entry:
successors: %bb.1(0x50000000), %bb.2(0x30000000)
CMP64mi8 $rip, 1, $noreg, @c, $noreg, 0, implicit-def $eflags, debug-location !21 :: (dereferenceable load (s64) from @c)
JCC_1 %bb.2, 4, implicit killed $eflags, debug-location !27
bb.1.if.then:
renamable $rax = MOV64rm $rip, 1, $noreg, @b, $noreg, debug-location !21 :: (dereferenceable load (s64) from @b)
RET64 $rax, debug-location !27
bb.2.if.end:
DBG_VALUE 0, $noreg, !19, !DIExpression(), debug-location !27
renamable $rax = MOV64rm $rip, 1, $noreg, @a, $noreg, debug-location !27 :: (dereferenceable load (s64) from @a)
RET64 $rax, debug-location !27
...
---
name: funtwo
body: |
bb.0.entry:
$eax = MOVZX32rm16 $noreg, 1, $noreg, 0, $noreg, debug-location !48 :: (load (s16) from `i16* null`, align 1)
DBG_VALUE $ax, $noreg, !39, !DIExpression(), debug-location !51
RET64 $ax, debug-location !51
...
|
