1; RUN: llc < %s -filetype=obj | llvm-readobj - -codeview | FileCheck %s
2;
3; Verify CodeView emission does not emit forward references for unnamed
4; structs/unions.  If a forward reference is emitted for an unnamed composite
5; type then Visual Studio will not be able to display the value.
6;
7;   Previous values displayed by Visual Studio:
8;      local.unnamed_struct    {...}
9;      local.unnamed_union     {...}
10;
11;   New values displayed by Visual Studio:
12;      local.unnamed_struct    {m3=66 'B' }
13;      local.unnamed_union     {m1=65 m2=65 'A' }
14;
15; The reproducer:
16;   $ cat unnamed.c
17;   struct named_struct {
18;     int    id;
19;     union {
20;       int  m1;
21;       char m2;
22;     } unnamed_union;
23;     struct {
24;       char m3;
25;     } unnamed_struct;
26;   };
27;
28;   int main()
29;   {
30;     struct named_struct local;
31;
32;     local.id = 1;
33;     local.unnamed_union.m1 = 65;
34;     local.unnamed_struct.m3 = 'B';
35;
36;     return 0;
37;   }
38;
39; To regenerate the IR below:
40;   $ clang unnamed.c -S -emit-llvm -g -gcodeview
41;
42; CHECK:      FieldList ([[UnnamedUnionFieldList:.*]]) {
43; CHECK-NEXT:   TypeLeafKind: LF_FIELDLIST (0x1203)
44; CHECK-NEXT:   DataMember {
45; CHECK-NEXT:     TypeLeafKind: LF_MEMBER (0x150D)
46; CHECK-NEXT:     AccessSpecifier: Public (0x3)
47; CHECK-NEXT:     Type: int (0x74)
48; CHECK-NEXT:     FieldOffset: 0x0
49; CHECK-NEXT:     Name: m1
50; CHECK-NEXT:   }
51; CHECK-NEXT:   DataMember {
52; CHECK-NEXT:     TypeLeafKind: LF_MEMBER (0x150D)
53; CHECK-NEXT:     AccessSpecifier: Public (0x3)
54; CHECK-NEXT:     Type: char (0x70)
55; CHECK-NEXT:     FieldOffset: 0x0
56; CHECK-NEXT:     Name: m2
57; CHECK-NEXT:   }
58; CHECK-NEXT: }
59; CHECK:      Union ([[UnnamedUnion:.*]]) {
60; CHECK-NEXT:   TypeLeafKind: LF_UNION (0x1506)
61; CHECK-NEXT:   MemberCount: 2
62; CHECK-NEXT:   Properties [ (0x408)
63; CHECK-NEXT:     Nested (0x8)
64; CHECK-NEXT:     Sealed (0x400)
65; CHECK-NEXT:   ]
66; CHECK-NEXT:   FieldList: <field list> ([[UnnamedUnionFieldList]])
67; CHECK-NEXT:   SizeOf: 4
68; CHECK-NEXT:   Name: named_struct::<unnamed-tag>
69; CHECK-NEXT: }
70; CHECK:      FieldList ([[UnnamedStructFieldList:.*]]) {
71; CHECK-NEXT:   TypeLeafKind: LF_FIELDLIST (0x1203)
72; CHECK-NEXT:   DataMember {
73; CHECK-NEXT:     TypeLeafKind: LF_MEMBER (0x150D)
74; CHECK-NEXT:     AccessSpecifier: Public (0x3)
75; CHECK-NEXT:     Type: char (0x70)
76; CHECK-NEXT:     FieldOffset: 0x0
77; CHECK-NEXT:     Name: m3
78; CHECK-NEXT:   }
79; CHECK-NEXT: }
80; CHECK:      Struct ([[UnnamedStruct:.*]]) {
81; CHECK-NEXT:   TypeLeafKind: LF_STRUCTURE (0x1505)
82; CHECK-NEXT:   MemberCount: 1
83; CHECK-NEXT:   Properties [ (0x8)
84; CHECK-NEXT:     Nested (0x8)
85; CHECK-NEXT:   ]
86; CHECK-NEXT:   FieldList: <field list> ([[UnnamedStructFieldList]])
87; CHECK-NEXT:   DerivedFrom: 0x0
88; CHECK-NEXT:   VShape: 0x0
89; CHECK-NEXT:   SizeOf: 1
90; CHECK-NEXT:   Name: named_struct::<unnamed-tag>
91; CHECK-NEXT: }
92; CHECK:      FieldList ([[NamedStructFieldList:.*]]) {
93; CHECK-NEXT:   TypeLeafKind: LF_FIELDLIST (0x1203)
94; CHECK-NEXT:   DataMember {
95; CHECK-NEXT:     TypeLeafKind: LF_MEMBER (0x150D)
96; CHECK-NEXT:     AccessSpecifier: Public (0x3)
97; CHECK-NEXT:     Type: int (0x74)
98; CHECK-NEXT:     FieldOffset: 0x0
99; CHECK-NEXT:     Name: id
100; CHECK-NEXT:   }
101; CHECK-NEXT:   DataMember {
102; CHECK-NEXT:     TypeLeafKind: LF_MEMBER (0x150D)
103; CHECK-NEXT:     AccessSpecifier: Public (0x3)
104; CHECK-NEXT:     Type: named_struct::<unnamed-tag> ([[UnnamedUnion]])
105; CHECK-NEXT:     FieldOffset: 0x4
106; CHECK-NEXT:     Name: unnamed_union
107; CHECK-NEXT:   }
108; CHECK-NEXT:   DataMember {
109; CHECK-NEXT:     TypeLeafKind: LF_MEMBER (0x150D)
110; CHECK-NEXT:     AccessSpecifier: Public (0x3)
111; CHECK-NEXT:     Type: named_struct::<unnamed-tag> ([[UnnamedStruct]])
112; CHECK-NEXT:     FieldOffset: 0x8
113; CHECK-NEXT:     Name: unnamed_struct
114; CHECK-NEXT:   }
115; CHECK-NEXT: }
116; CHECK:      Struct ({{.*}}) {
117; CHECK-NEXT:   TypeLeafKind: LF_STRUCTURE (0x1505)
118; CHECK-NEXT:   MemberCount: 3
119; CHECK-NEXT:   Properties [ (0x0)
120; CHECK-NEXT:   ]
121; CHECK-NEXT:   FieldList: <field list> ([[NamedStructFieldList]])
122; CHECK-NEXT:   DerivedFrom: 0x0
123; CHECK-NEXT:   VShape: 0x0
124; CHECK-NEXT:   SizeOf: 12
125; CHECK-NEXT:   Name: named_struct
126; CHECK-NEXT: }
127
128; ModuleID = 'unnamed.c'
129source_filename = "unnamed.c"
130target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
131target triple = "x86_64-pc-windows-msvc19.0.24210"
132
133%struct.named_struct = type { i32, %union.anon, %struct.anon }
134%union.anon = type { i32 }
135%struct.anon = type { i8 }
136
137; Function Attrs: noinline nounwind uwtable
138define i32 @main() #0 !dbg !7 {
139entry:
140  %retval = alloca i32, align 4
141  %local = alloca %struct.named_struct, align 4
142  store i32 0, i32* %retval, align 4
143  call void @llvm.dbg.declare(metadata %struct.named_struct* %local, metadata !11, metadata !25), !dbg !26
144  %id = getelementptr inbounds %struct.named_struct, %struct.named_struct* %local, i32 0, i32 0, !dbg !27
145  store i32 1, i32* %id, align 4, !dbg !28
146  %unnamed_union = getelementptr inbounds %struct.named_struct, %struct.named_struct* %local, i32 0, i32 1, !dbg !29
147  %m1 = bitcast %union.anon* %unnamed_union to i32*, !dbg !30
148  store i32 65, i32* %m1, align 4, !dbg !31
149  %unnamed_struct = getelementptr inbounds %struct.named_struct, %struct.named_struct* %local, i32 0, i32 2, !dbg !32
150  %m3 = getelementptr inbounds %struct.anon, %struct.anon* %unnamed_struct, i32 0, i32 0, !dbg !33
151  store i8 66, i8* %m3, align 4, !dbg !34
152  ret i32 0, !dbg !35
153}
154
155; Function Attrs: nounwind readnone
156declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
157
158attributes #0 = { noinline nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
159attributes #1 = { nounwind readnone }
160
161!llvm.dbg.cu = !{!0}
162!llvm.module.flags = !{!3, !4, !5}
163!llvm.ident = !{!6}
164
165!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
166!1 = !DIFile(filename: "unnamed.c", directory: "C:\5Cpath\5Cto\5Cdirectory", checksumkind: CSK_MD5, checksum: "a1874da39665a126d6949d929fbd4818")
167!2 = !{}
168!3 = !{i32 2, !"CodeView", i32 1}
169!4 = !{i32 2, !"Debug Info Version", i32 3}
170!5 = !{i32 1, !"PIC Level", i32 2}
171!6 = !{!"clang version 5.0.0 (trunk)"}
172!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 12, type: !8, isLocal: false, isDefinition: true, scopeLine: 13, isOptimized: false, unit: !0, retainedNodes: !2)
173!8 = !DISubroutineType(types: !9)
174!9 = !{!10}
175!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
176!11 = !DILocalVariable(name: "local", scope: !7, file: !1, line: 14, type: !12)
177!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "named_struct", file: !1, line: 1, size: 96, elements: !13)
178!13 = !{!14, !15, !21}
179!14 = !DIDerivedType(tag: DW_TAG_member, name: "id", scope: !12, file: !1, line: 2, baseType: !10, size: 32)
180!15 = !DIDerivedType(tag: DW_TAG_member, name: "unnamed_union", scope: !12, file: !1, line: 6, baseType: !16, size: 32, offset: 32)
181!16 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !12, file: !1, line: 3, size: 32, elements: !17)
182!17 = !{!18, !19}
183!18 = !DIDerivedType(tag: DW_TAG_member, name: "m1", scope: !16, file: !1, line: 4, baseType: !10, size: 32)
184!19 = !DIDerivedType(tag: DW_TAG_member, name: "m2", scope: !16, file: !1, line: 5, baseType: !20, size: 8)
185!20 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
186!21 = !DIDerivedType(tag: DW_TAG_member, name: "unnamed_struct", scope: !12, file: !1, line: 9, baseType: !22, size: 8, offset: 64)
187!22 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !12, file: !1, line: 7, size: 8, elements: !23)
188!23 = !{!24}
189!24 = !DIDerivedType(tag: DW_TAG_member, name: "m3", scope: !22, file: !1, line: 8, baseType: !20, size: 8)
190!25 = !DIExpression()
191!26 = !DILocation(line: 14, column: 23, scope: !7)
192!27 = !DILocation(line: 16, column: 9, scope: !7)
193!28 = !DILocation(line: 16, column: 12, scope: !7)
194!29 = !DILocation(line: 17, column: 9, scope: !7)
195!30 = !DILocation(line: 17, column: 23, scope: !7)
196!31 = !DILocation(line: 17, column: 26, scope: !7)
197!32 = !DILocation(line: 18, column: 9, scope: !7)
198!33 = !DILocation(line: 18, column: 24, scope: !7)
199!34 = !DILocation(line: 18, column: 27, scope: !7)
200!35 = !DILocation(line: 20, column: 3, scope: !7)
201