[clang][llvm] generate accessibility metadata for type aliases

[J-Camilleri]

Summary

The accessibility level of a typedef or using declaration in a
struct or class was being lost when producing debug information.

[J-Camilleri]

The premerge checks have failed but the only message I can see is HTTP 28 in the log. I am not sure where to look for more information about the failure, Can someone please point me in the right direction?

[dblaikie]

Looks pretty good to me - few things to clean up/simplify.

clang/lib/CodeGen/CGDebugInfo.cpp

1331–1333 ↗

(On Diff #461813)

https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements

clang/test/CodeGenCXX/debug-info-access.cpp

23–27 ↗

(On Diff #461813)

Arguably/I'd be fine with testing just one case here - since the implementation of choosing when to put an access modifier, which modifier to put, etc, is is already implemented and tested for other cases - so we might not need to duplicate that testing for this case.

But I don't mind too much either way.

llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp

793–795

This piece and the llvm test case should go in a separate commit (it can be committed before or after the clang-centric commit (probably before makes more sense)) but we can review it all together.

llvm/lib/IR/DIBuilder.cpp

351 ↗

(On Diff #461813)

While we usually split llvm & clang commits, in this case since it changes an API used by clang, this part of the llvm change should go along with the clang change.

llvm/test/DebugInfo/X86/debug-info-access.ll

12–32

Probably don't need all this test coverage - since most of this is motivated by the features up in clang - on the LLVM side we just need one case that demonstrates that if we put an access specifier in the flags, that gets emitted.

[J-Camilleri]

Addressing reviewer comments: Comply to offical style, Simplify test cases

[J-Camilleri]

clang/test/CodeGenCXX/debug-info-access.cpp

23–27 ↗

(On Diff #461813)

I agree with your assesment. I changed the test to just check that type aliases emit the flag not the logic of which flag is emitted.

llvm/lib/IR/DIBuilder.cpp

351 ↗

(On Diff #461813)

Regarding this and the previous comment about separating the llvm commit.

Am I to have 2 commits as follows?

1. change llvm to emit flag + test case
2. modify llvm interface + change clang to emit flag + test case

I do not have merge rights so I will ask for this when I get to the merge stage.

Thanks for the review.

llvm/test/DebugInfo/X86/debug-info-access.ll

12–32

I left the llvm to be the same as generated by the cpp file but changed the CHECK to just verify that the accessibility flag is emitted for a typedef.

[dblaikie]

I'll commit this shortly.

llvm/lib/IR/DIBuilder.cpp

351 ↗

(On Diff #461813)

If you don't have commit rights, no worries - I can sort this out when I commit this on your behalf.
But yes, your list of the two steps/order/pieces is correct.

llvm/test/DebugInfo/X86/debug-info-access.ll

12–32

Ah, makes sense - thanks!

[J-Camilleri]

In D134339#3808998, @dblaikie wrote:

I'll commit this shortly.

Ok, thanks for your time.

llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp

if (Size && Tag != dwarf::DW_TAG_pointer_type
            && Tag != dwarf::DW_TAG_ptr_to_member_type
            && Tag != dwarf::DW_TAG_reference_type
            && Tag != dwarf::DW_TAG_rvalue_reference_type)
     addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
 
   if (Tag == dwarf::DW_TAG_ptr_to_member_type)
     addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
                 *getOrCreateTypeDIE(cast<DIDerivedType>(DTy)->getClassType()));
+
+  addAccess(Buffer, DTy->getFlags());
+
   // Add source line info if available and TyDesc is not a forward declaration.
   if (!DTy->isForwardDecl())
     addSourceLine(Buffer, DTy);
 
   // If DWARF address space value is other than None, add it.  The IR
   // verifier checks that DWARF address space only exists for pointer
   // or reference types.
   if (DTy->getDWARFAddressSpace())

llvm/test/DebugInfo/X86/debug-info-access.ll

 ; RUN: llc -mtriple=x86_64-apple-darwin %s -o %t -filetype=obj
 ; RUN: llvm-dwarfdump -debug-info %t | FileCheck %s
 
 ; Test the DW_AT_accessibility DWARF attribute.
 
 ; Regenerate me:
 ; clang++ -g tools/clang/test/CodeGenCXX/debug-info-access.cpp -S -emit-llvm -o -
 ;
 ;   struct A {
 ;     void pub_default();
 ;     static int pub_default_static;
 ;   };
 ;
 ;   class B : public A {
 ;   public:
 ;     void pub();
 ;     static int public_static;
+;
 ;   protected:
+;     typedef int prot_typedef;
+;     using prot_using = prot_typedef;
+;     prot_using prot_member;
+;
 ;     void prot();
+;
 ;   private:
 ;     void priv_default();
 ;   };
 ;
 ;   class C {
 ;   public:
 ;     struct D {
 ;     };
 ;   protected:
 ;     union E {
 ;     };
+;   private:
+;     struct J {
+;     };
 ;   public:
 ;     D d;
 ;     E e;
+;     J j;
 ;   };
 ;
 ;   struct F {
 ;   private:
 ;     union G {
 ;     };
 ;   public:
 ;     G g;

 ;   union U {
 ;     void union_pub_default();
 ;   private:
 ;     int union_priv;
 ;   };
 ;
 ;   void free() {}
 ;
+;   U u;
 ;   A a;
 ;   B b;
-;   U u;
 ;   C c;
 ;   F f;
 ;   H h;
 
 ; CHECK: DW_TAG_member
 ; CHECK:     DW_AT_name {{.*}}"union_priv")
 ; CHECK-NOT: DW_TAG
 ; CHECK:     DW_AT_accessibility {{.*}}(DW_ACCESS_private)

 ; CHECK-NOT: DW_TAG
 ; CHECK:     DW_AT_accessibility {{.*}}(DW_ACCESS_public)
 
 ; CHECK: DW_TAG_member
 ; CHECK:     DW_AT_name {{.*}}"public_static")
 ; CHECK-NOT: DW_TAG
 ; CHECK:     DW_AT_accessibility {{.*}}(DW_ACCESS_public)
 
+; CHECK: DW_TAG_member
+; CHECK:     DW_AT_name {{.*}}"prot_member")
+
+; CHECK: DW_TAG_typedef
+; CHECK:     DW_AT_name {{.*}}"prot_using")
+; CHECK-NOT: DW_TAG
+; CHECK:     DW_AT_accessibility {{.*}}(DW_ACCESS_protected)
+
 ; CHECK: DW_TAG_subprogram
 ; CHECK:     DW_AT_name {{.*}}"pub")
 ; CHECK-NOT: DW_TAG
 ; CHECK:     DW_AT_accessibility {{.*}}(DW_ACCESS_public)
 
 ; CHECK: DW_TAG_subprogram
 ; CHECK:     DW_AT_name {{.*}}"prot")
 ; CHECK-NOT: DW_TAG

 ; CHECK:     DW_AT_accessibility (DW_ACCESS_private)
 
 ; CHECK: DW_TAG_subprogram
 ; CHECK:     DW_AT_name {{.*}}"free")
 ; CHECK-NOT: DW_AT_accessibility
 
 %union.U = type { i32 }
 %struct.A = type { i8 }
-%class.B = type { i8 }
-%class.C = type { %"struct.C::D", %"union.C::E" }
+%class.B = type { i32 }
+%class.C = type { %"struct.C::D", %"union.C::E", %"struct.C::J" }
 %"struct.C::D" = type { i8 }
 %"union.C::E" = type { i8 }
+%"struct.C::J" = type { i8 }
 %struct.F = type { %"union.F::G" }
 %"union.F::G" = type { i8 }
 %union.H = type { %"class.H::I" }
 %"class.H::I" = type { i8 }
 
-@u = global %union.U zeroinitializer, align 4, !dbg !0
-@a = global %struct.A zeroinitializer, align 1, !dbg !5
-@b = global %class.B zeroinitializer, align 1, !dbg !16
-@c = global %class.C zeroinitializer, align 1, !dbg !28
-@f = global %struct.F zeroinitializer, align 1, !dbg !37
-@h = global %union.H zeroinitializer, align 1, !dbg !43
+@u = dso_local global %union.U zeroinitializer, align 4, !dbg !0
+@a = dso_local global %struct.A zeroinitializer, align 1, !dbg !5
+@b = dso_local global %class.B zeroinitializer, align 4, !dbg !16
+@c = dso_local global %class.C zeroinitializer, align 1, !dbg !31
+@f = dso_local global %struct.F zeroinitializer, align 1, !dbg !42
+@h = dso_local global %union.H zeroinitializer, align 1, !dbg !48
 
-; Function Attrs: mustprogress noinline nounwind optnone
-define dso_local void @_Z4freev() #0 !dbg !59 {
+; Function Attrs: mustprogress noinline nounwind optnone uwtable
+define dso_local void @_Z4freev() #0 !dbg !69 {
 entry:
-  ret void, !dbg !62
+  ret void, !dbg !72
 }
 
-attributes #0 = { mustprogress noinline nounwind optnone "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-features"="+cx8,+mmx,+sse,+sse2,+x87" }
+attributes #0 = { mustprogress noinline nounwind optnone uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 
 !llvm.dbg.cu = !{!2}
-!llvm.module.flags = !{!56, !57}
-!llvm.ident = !{!58}
+!llvm.module.flags = !{!61, !62, !63, !64, !65, !66, !67}
+!llvm.ident = !{!68}
 
 !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
-!1 = distinct !DIGlobalVariable(name: "u", scope: !2, file: !7, line: 73, type: !49, isLocal: false, isDefinition: true)
-!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 14.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)
-!3 = !DIFile(filename: "clang/test/CodeGenCXX/<stdin>", directory: "")
-!4 = !{!0, !5, !16, !28, !37, !43}
+!1 = distinct !DIGlobalVariable(name: "u", scope: !2, file: !7, line: 86, type: !54, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 16.0.0 (https://github.com/llvm/llvm-project.git 113a643a597b6a8f68099fedbeb7509449d4bd50)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "/home/jon/sources/llvm-project/clang/test/CodeGenCXX/debug-info-access.cpp", directory: "/home/jon/sources/llvm-project/build/testing", checksumkind: CSK_MD5, checksum: "98644ed3fc3955a9b5fefee27d5c16ef")
+!4 = !{!0, !5, !16, !31, !42, !48}
 !5 = !DIGlobalVariableExpression(var: !6, expr: !DIExpression())
-!6 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !7, line: 74, type: !8, isLocal: false, isDefinition: true)
-!7 = !DIFile(filename: "clang/test/CodeGenCXX/debug-info-access.cpp", directory: "")
+!6 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !7, line: 87, type: !8, isLocal: false, isDefinition: true)
+!7 = !DIFile(filename: "clang/test/CodeGenCXX/debug-info-access.cpp", directory: "/home/jon/sources/llvm-project", checksumkind: CSK_MD5, checksum: "98644ed3fc3955a9b5fefee27d5c16ef")
 !8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !7, line: 3, size: 8, flags: DIFlagTypePassByValue, elements: !9, identifier: "_ZTS1A")
 !9 = !{!10, !12}
 !10 = !DIDerivedType(tag: DW_TAG_member, name: "pub_default_static", scope: !8, file: !7, line: 9, baseType: !11, flags: DIFlagStaticMember)
 !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
 !12 = !DISubprogram(name: "pub_default", linkageName: "_ZN1A11pub_defaultEv", scope: !8, file: !7, line: 7, type: !13, scopeLine: 7, flags: DIFlagPrototyped, spFlags: 0)
 !13 = !DISubroutineType(types: !14)
 !14 = !{null, !15}
 !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
 !16 = !DIGlobalVariableExpression(var: !17, expr: !DIExpression())
-!17 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !7, line: 75, type: !18, isLocal: false, isDefinition: true)
-!18 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "B", file: !7, line: 14, size: 8, flags: DIFlagTypePassByValue, elements: !19, identifier: "_ZTS1B")
-!19 = !{!20, !21, !22, !26, !27}
+!17 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !7, line: 88, type: !18, isLocal: false, isDefinition: true)
+!18 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "B", file: !7, line: 13, size: 32, flags: DIFlagTypePassByValue, elements: !19, identifier: "_ZTS1B")
+!19 = !{!20, !21, !22, !25, !29, !30}
 !20 = !DIDerivedType(tag: DW_TAG_inheritance, scope: !18, baseType: !8, flags: DIFlagPublic, extraData: i32 0)
-!21 = !DIDerivedType(tag: DW_TAG_member, name: "public_static", scope: !18, file: !7, line: 19, baseType: !11, flags: DIFlagPublic | DIFlagStaticMember)
-!22 = !DISubprogram(name: "pub", linkageName: "_ZN1B3pubEv", scope: !18, file: !7, line: 17, type: !23, scopeLine: 17, flags: DIFlagPublic | DIFlagPrototyped, spFlags: 0)
-!23 = !DISubroutineType(types: !24)
-!24 = !{null, !25}
-!25 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
-!26 = !DISubprogram(name: "prot", linkageName: "_ZN1B4protEv", scope: !18, file: !7, line: 22, type: !23, scopeLine: 22, flags: DIFlagProtected | DIFlagPrototyped, spFlags: 0)
-!27 = !DISubprogram(name: "priv_default", linkageName: "_ZN1B12priv_defaultEv", scope: !18, file: !7, line: 25, type: !23, scopeLine: 25, flags: DIFlagPrototyped, spFlags: 0)
-!28 = !DIGlobalVariableExpression(var: !29, expr: !DIExpression())
-!29 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !7, line: 76, type: !30, isLocal: false, isDefinition: true)
-!30 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "C", file: !7, line: 28, size: 16, flags: DIFlagTypePassByValue, elements: !31, identifier: "_ZTS1C")
-!31 = !{!32, !35}
-!32 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !30, file: !7, line: 38, baseType: !33, size: 8, flags: DIFlagPublic)
-!33 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "D", scope: !30, file: !7, line: 31, size: 8, flags: DIFlagPublic | DIFlagTypePassByValue, elements: !34, identifier: "_ZTSN1C1DE")
-!34 = !{}
-!35 = !DIDerivedType(tag: DW_TAG_member, name: "e", scope: !30, file: !7, line: 39, baseType: !36, size: 8, offset: 8, flags: DIFlagPublic)
-!36 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "E", scope: !30, file: !7, line: 35, size: 8, flags: DIFlagProtected | DIFlagTypePassByValue, elements: !34, identifier: "_ZTSN1C1EE")
-!37 = !DIGlobalVariableExpression(var: !38, expr: !DIExpression())
-!38 = distinct !DIGlobalVariable(name: "f", scope: !2, file: !7, line: 77, type: !39, isLocal: false, isDefinition: true)
-!39 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "F", file: !7, line: 42, size: 8, flags: DIFlagTypePassByValue, elements: !40, identifier: "_ZTS1F")
-!40 = !{!41}
-!41 = !DIDerivedType(tag: DW_TAG_member, name: "g", scope: !39, file: !7, line: 48, baseType: !42, size: 8)
-!42 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "G", scope: !39, file: !7, line: 45, size: 8, flags: DIFlagPrivate | DIFlagTypePassByValue, elements: !34, identifier: "_ZTSN1F1GE")
-!43 = !DIGlobalVariableExpression(var: !44, expr: !DIExpression())
-!44 = distinct !DIGlobalVariable(name: "h", scope: !2, file: !7, line: 78, type: !45, isLocal: false, isDefinition: true)
-!45 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "H", file: !7, line: 51, size: 8, flags: DIFlagTypePassByValue, elements: !46, identifier: "_ZTS1H")
-!46 = !{!47}
-!47 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !45, file: !7, line: 57, baseType: !48, size: 8)
-!48 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "I", scope: !45, file: !7, line: 54, size: 8, flags: DIFlagPrivate | DIFlagTypePassByValue, elements: !34, identifier: "_ZTSN1H1IE")
-!49 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "U", file: !7, line: 60, size: 32, flags: DIFlagTypePassByValue, elements: !50, identifier: "_ZTS1U")
-!50 = !{!51, !52}
-!51 = !DIDerivedType(tag: DW_TAG_member, name: "union_priv", scope: !49, file: !7, line: 65, baseType: !11, size: 32, flags: DIFlagPrivate)
-!52 = !DISubprogram(name: "union_pub_default", linkageName: "_ZN1U17union_pub_defaultEv", scope: !49, file: !7, line: 62, type: !53, scopeLine: 62, flags: DIFlagPrototyped, spFlags: 0)
-!53 = !DISubroutineType(types: !54)
-!54 = !{null, !55}
-!55 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !49, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
-!56 = !{i32 2, !"Debug Info Version", i32 3}
-!57 = !{i32 1, !"wchar_size", i32 4}
-!58 = !{!"clang version 14.0.0"}
-!59 = distinct !DISubprogram(name: "free", linkageName: "_Z4freev", scope: !7, file: !7, line: 71, type: !60, scopeLine: 71, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !34)
-!60 = !DISubroutineType(types: !61)
-!61 = !{null}
-!62 = !DILocation(line: 71, column: 14, scope: !59)
+!21 = !DIDerivedType(tag: DW_TAG_member, name: "public_static", scope: !18, file: !7, line: 18, baseType: !11, flags: DIFlagPublic | DIFlagStaticMember)
+!22 = !DIDerivedType(tag: DW_TAG_member, name: "prot_member", scope: !18, file: !7, line: 25, baseType: !23, size: 32, flags: DIFlagProtected)
+!23 = !DIDerivedType(tag: DW_TAG_typedef, name: "prot_using", scope: !18, file: !7, line: 24, baseType: !24, flags: DIFlagProtected)
+!24 = !DIDerivedType(tag: DW_TAG_typedef, name: "prot_typedef", scope: !18, file: !7, line: 22, baseType: !11, flags: DIFlagProtected)
+!25 = !DISubprogram(name: "pub", linkageName: "_ZN1B3pubEv", scope: !18, file: !7, line: 16, type: !26, scopeLine: 16, flags: DIFlagPublic | DIFlagPrototyped, spFlags: 0)
+!26 = !DISubroutineType(types: !27)
+!27 = !{null, !28}
+!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!29 = !DISubprogram(name: "prot", linkageName: "_ZN1B4protEv", scope: !18, file: !7, line: 29, type: !26, scopeLine: 29, flags: DIFlagProtected | DIFlagPrototyped, spFlags: 0)
+!30 = !DISubprogram(name: "priv_default", linkageName: "_ZN1B12priv_defaultEv", scope: !18, file: !7, line: 33, type: !26, scopeLine: 33, flags: DIFlagPrototyped, spFlags: 0)
+!31 = !DIGlobalVariableExpression(var: !32, expr: !DIExpression())
+!32 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !7, line: 89, type: !33, isLocal: false, isDefinition: true)
+!33 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "C", file: !7, line: 36, size: 24, flags: DIFlagTypePassByValue, elements: !34, identifier: "_ZTS1C")
+!34 = !{!35, !38, !40}
+!35 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !33, file: !7, line: 50, baseType: !36, size: 8, flags: DIFlagPublic)
+!36 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "D", scope: !33, file: !7, line: 39, size: 8, flags: DIFlagPublic | DIFlagTypePassByValue, elements: !37, identifier: "_ZTSN1C1DE")
+!37 = !{}
+!38 = !DIDerivedType(tag: DW_TAG_member, name: "e", scope: !33, file: !7, line: 51, baseType: !39, size: 8, offset: 8, flags: DIFlagPublic)
+!39 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "E", scope: !33, file: !7, line: 43, size: 8, flags: DIFlagProtected | DIFlagTypePassByValue, elements: !37, identifier: "_ZTSN1C1EE")
+!40 = !DIDerivedType(tag: DW_TAG_member, name: "j", scope: !33, file: !7, line: 52, baseType: !41, size: 8, offset: 16, flags: DIFlagPublic)
+!41 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "J", scope: !33, file: !7, line: 47, size: 8, flags: DIFlagTypePassByValue, elements: !37, identifier: "_ZTSN1C1JE")
+!42 = !DIGlobalVariableExpression(var: !43, expr: !DIExpression())
+!43 = distinct !DIGlobalVariable(name: "f", scope: !2, file: !7, line: 90, type: !44, isLocal: false, isDefinition: true)
+!44 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "F", file: !7, line: 55, size: 8, flags: DIFlagTypePassByValue, elements: !45, identifier: "_ZTS1F")
+!45 = !{!46}
+!46 = !DIDerivedType(tag: DW_TAG_member, name: "g", scope: !44, file: !7, line: 61, baseType: !47, size: 8)
+!47 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "G", scope: !44, file: !7, line: 58, size: 8, flags: DIFlagPrivate | DIFlagTypePassByValue, elements: !37, identifier: "_ZTSN1F1GE")
+!48 = !DIGlobalVariableExpression(var: !49, expr: !DIExpression())
+!49 = distinct !DIGlobalVariable(name: "h", scope: !2, file: !7, line: 91, type: !50, isLocal: false, isDefinition: true)
+!50 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "H", file: !7, line: 64, size: 8, flags: DIFlagTypePassByValue, elements: !51, identifier: "_ZTS1H")
+!51 = !{!52}
+!52 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !50, file: !7, line: 70, baseType: !53, size: 8)
+!53 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "I", scope: !50, file: !7, line: 67, size: 8, flags: DIFlagPrivate | DIFlagTypePassByValue, elements: !37, identifier: "_ZTSN1H1IE")
+!54 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "U", file: !7, line: 73, size: 32, flags: DIFlagTypePassByValue, elements: !55, identifier: "_ZTS1U")
+!55 = !{!56, !57}
+!56 = !DIDerivedType(tag: DW_TAG_member, name: "union_priv", scope: !54, file: !7, line: 78, baseType: !11, size: 32, flags: DIFlagPrivate)
+!57 = !DISubprogram(name: "union_pub_default", linkageName: "_ZN1U17union_pub_defaultEv", scope: !54, file: !7, line: 75, type: !58, scopeLine: 75, flags: DIFlagPrototyped, spFlags: 0)
+!58 = !DISubroutineType(types: !59)
+!59 = !{null, !60}
+!60 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !54, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!61 = !{i32 7, !"Dwarf Version", i32 5}
+!62 = !{i32 2, !"Debug Info Version", i32 3}
+!63 = !{i32 1, !"wchar_size", i32 4}
+!64 = !{i32 8, !"PIC Level", i32 2}
+!65 = !{i32 7, !"PIE Level", i32 2}
+!66 = !{i32 7, !"uwtable", i32 2}
+!67 = !{i32 7, !"frame-pointer", i32 2}
+!68 = !{!"clang version 16.0.0 (https://github.com/llvm/llvm-project.git 113a643a597b6a8f68099fedbeb7509449d4bd50)"}
+!69 = distinct !DISubprogram(name: "free", linkageName: "_Z4freev", scope: !7, file: !7, line: 84, type: !70, scopeLine: 84, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !37)
+!70 = !DISubroutineType(types: !71)
+!71 = !{null}
+!72 = !DILocation(line: 84, column: 14, scope: !69)