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1; RUN: llc < %s -filetype=obj | llvm-readobj - --codeview | FileCheck %s2; RUN: llc < %s | llvm-mc -filetype=obj --triple=x86_64-windows | llvm-readobj - --codeview | FileCheck %s3;4; Verify CodeView emission does not emit forward references for unnamed5; structs/unions. If a forward reference is emitted for an unnamed composite6; type then Visual Studio will not be able to display the value.7;8; Previous values displayed by Visual Studio:9; local.unnamed_struct {...}10; local.unnamed_union {...}11;12; New values displayed by Visual Studio:13; local.unnamed_struct {m3=66 'B' }14; local.unnamed_union {m1=65 m2=65 'A' }15;16; The reproducer:17; $ cat unnamed.c18; struct named_struct {19; int id;20; union {21; int m1;22; char m2;23; } unnamed_union;24; struct {25; char m3;26; } unnamed_struct;27; };28; 29; int main()30; {31; struct named_struct local;32; 33; local.id = 1;34; local.unnamed_union.m1 = 65;35; local.unnamed_struct.m3 = 'B';36; 37; return 0;38; }39;40; To regenerate the IR below:41; $ clang unnamed.c -S -emit-llvm -g -gcodeview42;43; CHECK: FieldList ([[UnnamedUnionFieldList:.*]]) {44; CHECK-NEXT: TypeLeafKind: LF_FIELDLIST (0x1203)45; CHECK-NEXT: DataMember {46; CHECK-NEXT: TypeLeafKind: LF_MEMBER (0x150D)47; CHECK-NEXT: AccessSpecifier: Public (0x3)48; CHECK-NEXT: Type: int (0x74)49; CHECK-NEXT: FieldOffset: 0x050; CHECK-NEXT: Name: m151; CHECK-NEXT: }52; CHECK-NEXT: DataMember {53; CHECK-NEXT: TypeLeafKind: LF_MEMBER (0x150D)54; CHECK-NEXT: AccessSpecifier: Public (0x3)55; CHECK-NEXT: Type: char (0x70)56; CHECK-NEXT: FieldOffset: 0x057; CHECK-NEXT: Name: m258; CHECK-NEXT: }59; CHECK-NEXT: }60; CHECK: Union ([[UnnamedUnion:.*]]) {61; CHECK-NEXT: TypeLeafKind: LF_UNION (0x1506)62; CHECK-NEXT: MemberCount: 263; CHECK-NEXT: Properties [ (0x408)64; CHECK-NEXT: Nested (0x8)65; CHECK-NEXT: Sealed (0x400)66; CHECK-NEXT: ]67; CHECK-NEXT: FieldList: <field list> ([[UnnamedUnionFieldList]])68; CHECK-NEXT: SizeOf: 469; CHECK-NEXT: Name: named_struct::<unnamed-tag>70; CHECK-NEXT: }71; CHECK: FieldList ([[UnnamedStructFieldList:.*]]) {72; CHECK-NEXT: TypeLeafKind: LF_FIELDLIST (0x1203)73; CHECK-NEXT: DataMember {74; CHECK-NEXT: TypeLeafKind: LF_MEMBER (0x150D)75; CHECK-NEXT: AccessSpecifier: Public (0x3)76; CHECK-NEXT: Type: char (0x70)77; CHECK-NEXT: FieldOffset: 0x078; CHECK-NEXT: Name: m379; CHECK-NEXT: }80; CHECK-NEXT: }81; CHECK: Struct ([[UnnamedStruct:.*]]) {82; CHECK-NEXT: TypeLeafKind: LF_STRUCTURE (0x1505)83; CHECK-NEXT: MemberCount: 184; CHECK-NEXT: Properties [ (0x8)85; CHECK-NEXT: Nested (0x8)86; CHECK-NEXT: ]87; CHECK-NEXT: FieldList: <field list> ([[UnnamedStructFieldList]])88; CHECK-NEXT: DerivedFrom: 0x089; CHECK-NEXT: VShape: 0x090; CHECK-NEXT: SizeOf: 191; CHECK-NEXT: Name: named_struct::<unnamed-tag>92; CHECK-NEXT: }93; CHECK: FieldList ([[NamedStructFieldList:.*]]) {94; CHECK-NEXT: TypeLeafKind: LF_FIELDLIST (0x1203)95; CHECK-NEXT: DataMember {96; CHECK-NEXT: TypeLeafKind: LF_MEMBER (0x150D)97; CHECK-NEXT: AccessSpecifier: Public (0x3)98; CHECK-NEXT: Type: int (0x74)99; CHECK-NEXT: FieldOffset: 0x0100; CHECK-NEXT: Name: id101; CHECK-NEXT: }102; CHECK-NEXT: DataMember {103; CHECK-NEXT: TypeLeafKind: LF_MEMBER (0x150D)104; CHECK-NEXT: AccessSpecifier: Public (0x3)105; CHECK-NEXT: Type: named_struct::<unnamed-tag> ([[UnnamedUnion]])106; CHECK-NEXT: FieldOffset: 0x4107; CHECK-NEXT: Name: unnamed_union108; CHECK-NEXT: }109; CHECK-NEXT: DataMember {110; CHECK-NEXT: TypeLeafKind: LF_MEMBER (0x150D)111; CHECK-NEXT: AccessSpecifier: Public (0x3)112; CHECK-NEXT: Type: named_struct::<unnamed-tag> ([[UnnamedStruct]])113; CHECK-NEXT: FieldOffset: 0x8114; CHECK-NEXT: Name: unnamed_struct115; CHECK-NEXT: }116; CHECK-NEXT: }117; CHECK: Struct ({{.*}}) {118; CHECK-NEXT: TypeLeafKind: LF_STRUCTURE (0x1505)119; CHECK-NEXT: MemberCount: 3120; CHECK-NEXT: Properties [ (0x0)121; CHECK-NEXT: ]122; CHECK-NEXT: FieldList: <field list> ([[NamedStructFieldList]])123; CHECK-NEXT: DerivedFrom: 0x0124; CHECK-NEXT: VShape: 0x0125; CHECK-NEXT: SizeOf: 12126; CHECK-NEXT: Name: named_struct127; CHECK-NEXT: }128 129; ModuleID = 'unnamed.c'130source_filename = "unnamed.c"131target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"132target triple = "x86_64-pc-windows-msvc19.0.24210"133 134%struct.named_struct = type { i32, %union.anon, %struct.anon }135%union.anon = type { i32 }136%struct.anon = type { i8 }137 138; Function Attrs: noinline nounwind uwtable139define i32 @main() #0 !dbg !7 {140entry:141 %retval = alloca i32, align 4142 %local = alloca %struct.named_struct, align 4143 store i32 0, ptr %retval, align 4144 call void @llvm.dbg.declare(metadata ptr %local, metadata !11, metadata !25), !dbg !26145 store i32 1, ptr %local, align 4, !dbg !28146 %unnamed_union = getelementptr inbounds %struct.named_struct, ptr %local, i32 0, i32 1, !dbg !29147 store i32 65, ptr %unnamed_union, align 4, !dbg !31148 %unnamed_struct = getelementptr inbounds %struct.named_struct, ptr %local, i32 0, i32 2, !dbg !32149 store i8 66, ptr %unnamed_struct, align 4, !dbg !34150 ret i32 0, !dbg !35151}152 153; Function Attrs: nounwind readnone154declare void @llvm.dbg.declare(metadata, metadata, metadata) #1155 156attributes #0 = { noinline nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "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" "use-soft-float"="false" }157attributes #1 = { nounwind readnone }158 159!llvm.dbg.cu = !{!0}160!llvm.module.flags = !{!3, !4, !5}161!llvm.ident = !{!6}162 163!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)164!1 = !DIFile(filename: "unnamed.c", directory: "C:\5Cpath\5Cto\5Cdirectory", checksumkind: CSK_MD5, checksum: "a1874da39665a126d6949d929fbd4818")165!2 = !{}166!3 = !{i32 2, !"CodeView", i32 1}167!4 = !{i32 2, !"Debug Info Version", i32 3}168!5 = !{i32 1, !"PIC Level", i32 2}169!6 = !{!"clang version 5.0.0 (trunk)"}170!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)171!8 = !DISubroutineType(types: !9)172!9 = !{!10}173!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)174!11 = !DILocalVariable(name: "local", scope: !7, file: !1, line: 14, type: !12)175!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "named_struct", file: !1, line: 1, size: 96, elements: !13)176!13 = !{!14, !15, !21}177!14 = !DIDerivedType(tag: DW_TAG_member, name: "id", scope: !12, file: !1, line: 2, baseType: !10, size: 32)178!15 = !DIDerivedType(tag: DW_TAG_member, name: "unnamed_union", scope: !12, file: !1, line: 6, baseType: !16, size: 32, offset: 32)179!16 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !12, file: !1, line: 3, size: 32, elements: !17)180!17 = !{!18, !19}181!18 = !DIDerivedType(tag: DW_TAG_member, name: "m1", scope: !16, file: !1, line: 4, baseType: !10, size: 32)182!19 = !DIDerivedType(tag: DW_TAG_member, name: "m2", scope: !16, file: !1, line: 5, baseType: !20, size: 8)183!20 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)184!21 = !DIDerivedType(tag: DW_TAG_member, name: "unnamed_struct", scope: !12, file: !1, line: 9, baseType: !22, size: 8, offset: 64)185!22 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !12, file: !1, line: 7, size: 8, elements: !23)186!23 = !{!24}187!24 = !DIDerivedType(tag: DW_TAG_member, name: "m3", scope: !22, file: !1, line: 8, baseType: !20, size: 8)188!25 = !DIExpression()189!26 = !DILocation(line: 14, column: 23, scope: !7)190!27 = !DILocation(line: 16, column: 9, scope: !7)191!28 = !DILocation(line: 16, column: 12, scope: !7)192!29 = !DILocation(line: 17, column: 9, scope: !7)193!30 = !DILocation(line: 17, column: 23, scope: !7)194!31 = !DILocation(line: 17, column: 26, scope: !7)195!32 = !DILocation(line: 18, column: 9, scope: !7)196!33 = !DILocation(line: 18, column: 24, scope: !7)197!34 = !DILocation(line: 18, column: 27, scope: !7)198!35 = !DILocation(line: 20, column: 3, scope: !7)199