1; RUN: llc < %s -filetype=obj | llvm-readobj - --codeview | FileCheck %s 2; RUN: llc < %s | llvm-mc -filetype=obj --triple=x86_64-windows | llvm-readobj - --codeview | FileCheck %s 3 4; This test ensures that circular type references through pointer types don't 5; cause infinite recursion. It also tests that we always refer to the forward 6; declaration type index in field lists and pointer types, which is consistent 7; with what MSVC does. It ensures that these records get merged when merging 8; streams even if the complete record types differ slightly due to ODR 9; violations, i.e. methods that only exist ifndef NDEBUG. 10 11; C++ source to regenerate: 12; $ cat t.cpp 13; struct B; 14; struct A { B *b; }; 15; struct B { A a; }; 16; void f() { 17; A a; 18; B b; 19; } 20; $ clang t.cpp -S -emit-llvm -g -gcodeview -o t.ll 21 22; CHECK: CodeViewTypes [ 23; CHECK: Section: .debug$T (6) 24; CHECK: Magic: 0x4 25; CHECK: ArgList (0x1000) { 26; CHECK: TypeLeafKind: LF_ARGLIST (0x1201) 27; CHECK: NumArgs: 0 28; CHECK: Arguments [ 29; CHECK: ] 30; CHECK: } 31; CHECK: Procedure (0x1001) { 32; CHECK: TypeLeafKind: LF_PROCEDURE (0x1008) 33; CHECK: ReturnType: void (0x3) 34; CHECK: CallingConvention: NearC (0x0) 35; CHECK: FunctionOptions [ (0x0) 36; CHECK: ] 37; CHECK: NumParameters: 0 38; CHECK: ArgListType: () (0x1000) 39; CHECK: } 40; CHECK: FuncId (0x1002) { 41; CHECK: TypeLeafKind: LF_FUNC_ID (0x1601) 42; CHECK: ParentScope: 0x0 43; CHECK: FunctionType: void () (0x1001) 44; CHECK: Name: f 45; CHECK: } 46; CHECK: Struct (0x1003) { 47; CHECK: TypeLeafKind: LF_STRUCTURE (0x1505) 48; CHECK: MemberCount: 0 49; CHECK: Properties [ (0x80) 50; CHECK: ForwardReference (0x80) 51; CHECK: ] 52; CHECK: FieldList: 0x0 53; CHECK: DerivedFrom: 0x0 54; CHECK: VShape: 0x0 55; CHECK: SizeOf: 0 56; CHECK: Name: A 57; CHECK: } 58; CHECK: Struct (0x1004) { 59; CHECK: TypeLeafKind: LF_STRUCTURE (0x1505) 60; CHECK: MemberCount: 0 61; CHECK: Properties [ (0x80) 62; CHECK: ForwardReference (0x80) 63; CHECK: ] 64; CHECK: FieldList: 0x0 65; CHECK: DerivedFrom: 0x0 66; CHECK: VShape: 0x0 67; CHECK: SizeOf: 0 68; CHECK: Name: B 69; CHECK: } 70; CHECK: Pointer (0x1005) { 71; CHECK: TypeLeafKind: LF_POINTER (0x1002) 72; CHECK: PointeeType: B (0x1004) 73; CHECK: PtrType: Near64 (0xC) 74; CHECK: PtrMode: Pointer (0x0) 75; CHECK: IsFlat: 0 76; CHECK: IsConst: 0 77; CHECK: IsVolatile: 0 78; CHECK: IsUnaligned: 0 79; CHECK: } 80; CHECK: FieldList (0x1006) { 81; CHECK: TypeLeafKind: LF_FIELDLIST (0x1203) 82; CHECK: DataMember { 83; CHECK: AccessSpecifier: Public (0x3) 84; CHECK: Type: B* (0x1005) 85; CHECK: FieldOffset: 0x0 86; CHECK: Name: b 87; CHECK: } 88; CHECK: } 89; CHECK: Struct (0x1007) { 90; CHECK: TypeLeafKind: LF_STRUCTURE (0x1505) 91; CHECK: MemberCount: 1 92; CHECK: Properties [ (0x0) 93; CHECK: ] 94; CHECK: FieldList: <field list> (0x1006) 95; CHECK: DerivedFrom: 0x0 96; CHECK: VShape: 0x0 97; CHECK: SizeOf: 8 98; CHECK: Name: A 99; CHECK: } 100; CHECK: StringId (0x1008) { 101; CHECK: TypeLeafKind: LF_STRING_ID (0x1605) 102; CHECK: Id: 0x0 103; CHECK: StringData: D:\src\llvm\build\t.cpp 104; CHECK: } 105; CHECK: UdtSourceLine (0x1009) { 106; CHECK: TypeLeafKind: LF_UDT_SRC_LINE (0x1606) 107; CHECK: UDT: A (0x1007) 108; CHECK: SourceFile: D:\src\llvm\build\t.cpp (0x1008) 109; CHECK: LineNumber: 2 110; CHECK: } 111; CHECK: FieldList (0x100A) { 112; CHECK: TypeLeafKind: LF_FIELDLIST (0x1203) 113; CHECK: DataMember { 114; CHECK: AccessSpecifier: Public (0x3) 115; CHECK: Type: A (0x1003) 116; CHECK: FieldOffset: 0x0 117; CHECK: Name: a 118; CHECK: } 119; CHECK: } 120; CHECK: Struct (0x100B) { 121; CHECK: TypeLeafKind: LF_STRUCTURE (0x1505) 122; CHECK: MemberCount: 1 123; CHECK: Properties [ (0x0) 124; CHECK: ] 125; CHECK: FieldList: <field list> (0x100A) 126; CHECK: DerivedFrom: 0x0 127; CHECK: VShape: 0x0 128; CHECK: SizeOf: 8 129; CHECK: Name: B 130; CHECK: } 131; CHECK: UdtSourceLine (0x100C) { 132; CHECK: TypeLeafKind: LF_UDT_SRC_LINE (0x1606) 133; CHECK: UDT: B (0x100B) 134; CHECK: SourceFile: D:\src\llvm\build\t.cpp (0x1008) 135; CHECK: LineNumber: 3 136; CHECK: } 137; CHECK: ] 138 139; ModuleID = 't.cpp' 140source_filename = "t.cpp" 141target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" 142target triple = "x86_64-pc-windows-msvc19.0.23918" 143 144%struct.A = type { %struct.B* } 145%struct.B = type { %struct.A } 146 147; Function Attrs: nounwind uwtable 148define void @"\01?f@@YAXXZ"() #0 !dbg !7 { 149entry: 150 %a = alloca %struct.A, align 8 151 %b = alloca %struct.B, align 8 152 call void @llvm.dbg.declare(metadata %struct.A* %a, metadata !10, metadata !18), !dbg !19 153 call void @llvm.dbg.declare(metadata %struct.B* %b, metadata !20, metadata !18), !dbg !21 154 ret void, !dbg !22 155} 156 157; Function Attrs: nounwind readnone 158declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 159 160attributes #0 = { nounwind uwtable "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" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } 161attributes #1 = { nounwind readnone } 162 163!llvm.dbg.cu = !{!0} 164!llvm.module.flags = !{!3, !4, !5} 165!llvm.ident = !{!6} 166 167!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 168!1 = !DIFile(filename: "t.cpp", directory: "D:\5Csrc\5Cllvm\5Cbuild") 169!2 = !{} 170!3 = !{i32 2, !"CodeView", i32 1} 171!4 = !{i32 2, !"Debug Info Version", i32 3} 172!5 = !{i32 1, !"PIC Level", i32 2} 173!6 = !{!"clang version 3.9.0 "} 174!7 = distinct !DISubprogram(name: "f", linkageName: "\01?f@@YAXXZ", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 175!8 = !DISubroutineType(types: !9) 176!9 = !{null} 177!10 = !DILocalVariable(name: "a", scope: !7, file: !1, line: 5, type: !11) 178!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !1, line: 2, size: 64, align: 64, elements: !12) 179!12 = !{!13} 180!13 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !11, file: !1, line: 2, baseType: !14, size: 64, align: 64) 181!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64, align: 64) 182!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "B", file: !1, line: 3, size: 64, align: 64, elements: !16) 183!16 = !{!17} 184!17 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !15, file: !1, line: 3, baseType: !11, size: 64, align: 64) 185!18 = !DIExpression() 186!19 = !DILocation(line: 5, column: 5, scope: !7) 187!20 = !DILocalVariable(name: "b", scope: !7, file: !1, line: 6, type: !15) 188!21 = !DILocation(line: 6, column: 5, scope: !7) 189!22 = !DILocation(line: 7, column: 1, scope: !7) 190