[CodeView] Emit function options for subprogram and member functions

[asmith]

Summary

Use the newly added DebugInfo (DI) Trivial flag, which indicates if a C++ record is trivial or not, to determine Codeview::FunctionOptions.

Clang and MSVC generate slightly different Codeview for C++ records. For example, here is the C++ code for a class with a defaulted ctor,

class C {
public:
  C() = default;
};

Clang will produce a LF for the defaulted ctor while MSVC does not. For more details, refer to FIXMEs in the test cases in "function-options.ll" included with this set of changes.

[rnk]

I think we actually want the triviality marker on the DISubprogram, not the DICompositeType. If I understand, this patch will still emit LF_METHOD records for trivial, but user-defaulted constructors, like:

struct Foo { Foo() = default; };

[asmith]

There's no LF_METHOD generated by Clang. Take a look at C1Class in the included tests which is the same are your example.

class C1Class {
public:
  C1Class() = default; // FIXME: Clang generates defaulted ctor while MSVC doesn't.
                       // We won't check what clang yields in this test. (though FO is correct)
};

[rnk]

You're right, this patch does get the constructor member LF right, but it would be easier and more direct if the constructor itself were marked trivial or just omitted by clang.

[asmith]

Adding Aleksandr

[zturner]

I'll ask Reid to take another look at this next week. He's been on a long vacation.

[rnk]

It might be best to limit the scope of the patch to just CxxReturnUdt and we can fix the other flags incrementally.

CodeGen/AsmPrinter/CodeViewDebug.cpp

334 ↗

(On Diff #140543)

This isn't going to work. The frontend is going to need to tag classes with the information you want. Consider this example:

struct A {};
struct B : virtual A {
  B();
};
struct C : B {
  C();
};
C::C() {}

Clang will only emit a forward declaration for B, so you won't be able to walk the whole class hierarchy.

373 ↗

(On Diff #140543)

For constructors, what's the purpose of checking if the class is trivial?

[Hui]

CodeGen/AsmPrinter/CodeViewDebug.cpp

373 ↗

(On Diff #140543)

It is observed that MSVC does not emit FunctionOptions::Constructor for a trivial ctor. Checking triviality of ctor is to conform with MSVC.

[Hui]

CodeGen/AsmPrinter/CodeViewDebug.cpp

334 ↗

(On Diff #140543)

Yes. You are right. However it depends on whether Clang would like to emit complete type for B or not. This routine is transparent to incomplete/complete type of UDT.

clang only emts forwarded B.

Struct (0x1001) {
   TypeLeafKind: LF_STRUCTURE (0x1505)
   MemberCount: 0
   Properties [ (0x280)
     ForwardReference (0x80)
     HasUniqueName (0x200)
   ]
   FieldList: 0x0
   DerivedFrom: 0x0
   VShape: 0x0
   SizeOf: 0
   Name: B
   LinkageName: .?AUB@@
 }

MSVC emits both.

Struct (0x1001) {
   TypeLeafKind: LF_STRUCTURE (0x1505)
   MemberCount: 0
   Properties [ (0x280)
     ForwardReference (0x80)
     HasUniqueName (0x200)
   ]
   FieldList: 0x0
   DerivedFrom: 0x0
   VShape: 0x0
   SizeOf: 0
   Name: B
   LinkageName: .?AUB@@
 }

 Struct (0x101A) {
   TypeLeafKind: LF_STRUCTURE (0x1505)
   MemberCount: 6
   Properties [ (0x226)
     HasConstructorOrDestructor (0x2)
     HasOverloadedAssignmentOperator (0x20)
     HasOverloadedOperator (0x4)
     HasUniqueName (0x200)
   ]
   FieldList: <field list> (0x1019)
   DerivedFrom: 0x0
   VShape: 0x0
   SizeOf: 8
   Name: B
   LinkageName: .?AUB@@
 }

[rnk]

CodeGen/AsmPrinter/CodeViewDebug.cpp

334 ↗

(On Diff #140543)

Yes, this is by design. In order to get this right 100% of the time, we will need a new flag, and this code will not be needed. I would prefer not to add it in the first place. Please remove this and reduce the scope of the patch. You can leave a FIXME comment about setting FunctionOptions::ConstructorWithVBase later.

[asmith]

Limit the scope of the patch per feedback from RNK

[rnk]

lgtm, thanks!

test/DebugInfo/COFF/function-options.ll

71 ↗

(On Diff #167666)

In the future, you might find llvm-pdbutil dump -types to be a little more FileCheck-friendly. It's more concise, and it works on both object files and PDBs, so you only have to read one dumper format.

llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.h

codeview::TypeIndex lowerTypePointer(
       const DIDerivedType *Ty,
       codeview::PointerOptions PO = codeview::PointerOptions::None);
   codeview::TypeIndex lowerTypeMemberPointer(
       const DIDerivedType *Ty,
       codeview::PointerOptions PO = codeview::PointerOptions::None);
   codeview::TypeIndex lowerTypeModifier(const DIDerivedType *Ty);
   codeview::TypeIndex lowerTypeFunction(const DISubroutineType *Ty);
   codeview::TypeIndex lowerTypeVFTableShape(const DIDerivedType *Ty);
-  codeview::TypeIndex lowerTypeMemberFunction(const DISubroutineType *Ty,
-                                              const DIType *ClassTy,
-                                              int ThisAdjustment,
-                                              bool IsStaticMethod);
+  codeview::TypeIndex lowerTypeMemberFunction(
+      const DISubroutineType *Ty, const DIType *ClassTy, int ThisAdjustment,
+      bool IsStaticMethod,
+      codeview::FunctionOptions FO = codeview::FunctionOptions::None);
   codeview::TypeIndex lowerTypeEnum(const DICompositeType *Ty);
   codeview::TypeIndex lowerTypeClass(const DICompositeType *Ty);
   codeview::TypeIndex lowerTypeUnion(const DICompositeType *Ty);
 
   /// Symbol records should point to complete types, but type records should
   /// always point to incomplete types to avoid cycles in the type graph. Only
   /// use this entry point when generating symbol records. The complete and
   /// incomplete type indices only differ for record types. All other types use

llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp

if (const auto *Class = dyn_cast_or_null<DICompositeType>(Scope)) {
     TypeIndex ParentScope = getScopeIndex(Scope);
     FuncIdRecord FuncId(ParentScope, getTypeIndex(SP->getType()), DisplayName);
     TI = TypeTable.writeLeafType(FuncId);
   }
 
   return recordTypeIndexForDINode(SP, TI);
 }
 
+static bool isTrivial(const DICompositeType *DCTy) {
+  return ((DCTy->getFlags() & DINode::FlagTrivial) == DINode::FlagTrivial);
+}
+
+static FunctionOptions
+getFunctionOptions(const DISubroutineType *Ty,
+                   const DICompositeType *ClassTy = nullptr,
+                   StringRef SPName = StringRef("")) {
+  FunctionOptions FO = FunctionOptions::None;
+  const DIType *ReturnTy = nullptr;
+  if (auto TypeArray = Ty->getTypeArray()) {
+    if (TypeArray.size())
+      ReturnTy = TypeArray[0].resolve();
+  }
+
+  if (auto *ReturnDCTy = dyn_cast_or_null<DICompositeType>(ReturnTy)) {
+    if (!isTrivial(ReturnDCTy))
+      FO |= FunctionOptions::CxxReturnUdt;
+  }
+
+  // DISubroutineType is unnamed. Use DISubprogram's i.e. SPName in comparison.
+  if (ClassTy && !isTrivial(ClassTy) && SPName == ClassTy->getName()) {
+    FO |= FunctionOptions::Constructor;
+
+  // TODO: put the FunctionOptions::ConstructorWithVirtualBases flag.
+
+  }
+  return FO;
+}
+
 TypeIndex CodeViewDebug::getMemberFunctionType(const DISubprogram *SP,
                                                const DICompositeType *Class) {
   // Always use the method declaration as the key for the function type. The
   // method declaration contains the this adjustment.
   if (SP->getDeclaration())
     SP = SP->getDeclaration();
   assert(!SP->getDeclaration() && "should use declaration as key");
 
   // Key the MemberFunctionRecord into the map as {SP, Class}. It won't collide
   // with the MemberFuncIdRecord, which is keyed in as {SP, nullptr}.
   auto I = TypeIndices.find({SP, Class});
   if (I != TypeIndices.end())
     return I->second;
 
   // Make sure complete type info for the class is emitted *after* the member
   // function type, as the complete class type is likely to reference this
   // member function type.
   TypeLoweringScope S(*this);
   const bool IsStaticMethod = (SP->getFlags() & DINode::FlagStaticMember) != 0;
+
+  FunctionOptions FO = getFunctionOptions(SP->getType(), Class, SP->getName());
   TypeIndex TI = lowerTypeMemberFunction(
-      SP->getType(), Class, SP->getThisAdjustment(), IsStaticMethod);
+      SP->getType(), Class, SP->getThisAdjustment(), IsStaticMethod, FO);
   return recordTypeIndexForDINode(SP, TI, Class);
 }
 
 TypeIndex CodeViewDebug::recordTypeIndexForDINode(const DINode *Node,
                                                   TypeIndex TI,
                                                   const DIType *ClassTy) {
   auto InsertResult = TypeIndices.insert({{Node, ClassTy}, TI});
   (void)InsertResult;
if (!ReturnAndArgTypeIndices.empty()) {
     ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
   }
 
   ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
   TypeIndex ArgListIndex = TypeTable.writeLeafType(ArgListRec);
 
   CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
 
-  ProcedureRecord Procedure(ReturnTypeIndex, CC, FunctionOptions::None,
-                            ArgTypeIndices.size(), ArgListIndex);
+  FunctionOptions FO = getFunctionOptions(Ty);
+  ProcedureRecord Procedure(ReturnTypeIndex, CC, FO, ArgTypeIndices.size(),
+                            ArgListIndex);
   return TypeTable.writeLeafType(Procedure);
 }
 
 TypeIndex CodeViewDebug::lowerTypeMemberFunction(const DISubroutineType *Ty,
                                                  const DIType *ClassTy,
                                                  int ThisAdjustment,
-                                                 bool IsStaticMethod) {
+                                                 bool IsStaticMethod,
+                                                 FunctionOptions FO) {
   // Lower the containing class type.
   TypeIndex ClassType = getTypeIndex(ClassTy);
 
   SmallVector<TypeIndex, 8> ReturnAndArgTypeIndices;
   for (DITypeRef ArgTypeRef : Ty->getTypeArray())
     ReturnAndArgTypeIndices.push_back(getTypeIndex(ArgTypeRef));
 
   // MSVC uses type none for variadic argument.
if (!IsStaticMethod && !ArgTypeIndices.empty()) {
     ArgTypeIndices = ArgTypeIndices.drop_front();
   }
 
   ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
   TypeIndex ArgListIndex = TypeTable.writeLeafType(ArgListRec);
 
   CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
 
-  // TODO: Need to use the correct values for FunctionOptions.
-  MemberFunctionRecord MFR(ReturnTypeIndex, ClassType, ThisTypeIndex, CC,
-                           FunctionOptions::None, ArgTypeIndices.size(),
-                           ArgListIndex, ThisAdjustment);
+  MemberFunctionRecord MFR(ReturnTypeIndex, ClassType, ThisTypeIndex, CC, FO,
+                           ArgTypeIndices.size(), ArgListIndex, ThisAdjustment);
   return TypeTable.writeLeafType(MFR);
 }
 
 TypeIndex CodeViewDebug::lowerTypeVFTableShape(const DIDerivedType *Ty) {
   unsigned VSlotCount =
       Ty->getSizeInBits() / (8 * Asm->MAI->getCodePointerSize());
   SmallVector<VFTableSlotKind, 4> Slots(VSlotCount, VFTableSlotKind::Near);
 

llvm/trunk/test/DebugInfo/COFF/function-options.ll

+; RUN: llc < %s -filetype=obj | llvm-readobj - -codeview | FileCheck %s
+;
+; Command to generate function-options.ll
+; $ clang++ function-options.cpp -S -emit-llvm -g -gcodeview -o function-options.ll
+;
+;
+; #define DEFINE_FUNCTION(T) \
+;   T Func_##T(T &arg) { return arg; }
+;
+; class AClass {};
+; DEFINE_FUNCTION(AClass); // Expect: FO = None
+;
+; class BClass {
+; private:
+;   explicit BClass(); // Expect ctor: FO = Constructor
+; };
+; DEFINE_FUNCTION(BClass); // Expect: FO = CxxReturnUdt
+;
+; class C1Class {
+; public:
+;   C1Class() = default; // Note: Clang generates one defaulted ctor (FO = None) while MSVC doesn't.
+; };
+; DEFINE_FUNCTION(C1Class); // Expect: FO = None
+;
+; class C2Class { // Note: MSVC-specific dtor, i.e. __vecDelDtor won't be verified in this case.
+; public:
+;   ~C2Class() {} // Expect ~C2Class: FO = None
+; };
+; DEFINE_FUNCTION(C2Class); // Expect: FO = CxxReturnUdt
+;
+; class DClass : public BClass {}; // Note: MSVC yields one compiler-generated ctor for DClass while clang doesn't.
+; DEFINE_FUNCTION(DClass); // Expect: FO = CxxReturnUdt
+;
+; class FClass { static int x; };
+; DEFINE_FUNCTION(FClass); // Expect FO = None
+; 
+; struct AStruct {};
+; DEFINE_FUNCTION(AStruct); // Expect FO = None
+;
+; struct BStruct { BStruct(); }; // Expect ctor: FO = Constructor
+; DEFINE_FUNCTION(BStruct); // Expect FO = CxxReturnUdt
+;
+; union AUnion {};
+; DEFINE_FUNCTION(AUnion); // Expect FO = None
+;
+; union BUnion { BUnion() = default; }; // Note: Clang generates one defaulted ctor (FO = None) while MSVC does not.
+; DEFINE_FUNCTION(BUnion); // Expect FO = None
+
+
+; CHECK: Format: COFF-x86-64
+; CHECK: Arch: x86_64
+; CHECK: AddressSize: 64bit
+; CHECK: CodeViewTypes [
+; CHECK:   Section: .debug$T ({{.*}})
+; CHECK:   Magic: 0x4
+; CHECK:   Procedure ([[SP1:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: AClass ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (AClass&) ({{.*}})
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: AClass (AClass&) ([[SP1]])
+; CHECK:     Name: Func_AClass
+; CHECK:   }
+; CHECK:   Procedure ([[SP2:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: BClass ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x1)
+; CHECK:       CxxReturnUdt (0x1)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (BClass&) ({{.*}})
+; CHECK:   }
+; CHECK:   MemberFunction ([[MF1:.*]]) {
+; CHECK:     TypeLeafKind: LF_MFUNCTION (0x1009)
+; CHECK:     ReturnType: void (0x3)
+; CHECK:     ClassType: BClass ({{.*}})
+; CHECK:     ThisType: BClass* ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x2)
+; CHECK:       Constructor (0x2)
+; CHECK:     ]
+; CHECK:     NumParameters: 0
+; CHECK:     ArgListType: () ({{.*}})
+; CHECK:     ThisAdjustment: 0
+; CHECK:   }
+; CHECK:   FieldList ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FIELDLIST (0x1203)
+; CHECK:     OneMethod {
+; CHECK:       TypeLeafKind: LF_ONEMETHOD (0x1511)
+; CHECK:       AccessSpecifier: Private (0x1)
+; CHECK:       Type: void BClass::() ([[MF1]])
+; CHECK:       Name: BClass
+; CHECK:     }
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: BClass (BClass&) ([[SP2]])
+; CHECK:     Name: Func_BClass
+; CHECK:   }
+; CHECK:   Procedure ([[SP3:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: C1Class ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (C1Class&) ({{.*}})
+; CHECK:   }
+; CHECK:   MemberFunction ([[MF2:.*]]) {
+; CHECK:     TypeLeafKind: LF_MFUNCTION (0x1009)
+; CHECK:     ReturnType: void (0x3)
+; CHECK:     ClassType: C1Class ({{.*}})
+; CHECK:     ThisType: C1Class* ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 0
+; CHECK:     ArgListType: () ({{.*}})
+; CHECK:     ThisAdjustment: 0
+; CHECK:   }
+; CHECK:   FieldList ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FIELDLIST (0x1203)
+; CHECK:     OneMethod {
+; CHECK:       TypeLeafKind: LF_ONEMETHOD (0x1511)
+; CHECK:       AccessSpecifier: Public (0x3)
+; CHECK:       Type: void C1Class::() ([[MF2]])
+; CHECK:       Name: C1Class
+; CHECK:     }
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: C1Class (C1Class&) ([[SP3]])
+; CHECK:     Name: Func_C1Class
+; CHECK:   }
+; CHECK:   Procedure ([[SP4:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: C2Class ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x1)
+; CHECK:       CxxReturnUdt (0x1)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (C2Class&) ({{.*}})
+; CHECK:   }
+; CHECK:   MemberFunction ([[MF3:.*]]) {
+; CHECK:     TypeLeafKind: LF_MFUNCTION (0x1009)
+; CHECK:     ReturnType: void (0x3)
+; CHECK:     ClassType: C2Class ({{.*}})
+; CHECK:     ThisType: C2Class* ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 0
+; CHECK:     ArgListType: () ({{.*}})
+; CHECK:     ThisAdjustment: 0
+; CHECK:   }
+; CHECK:   FieldList ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FIELDLIST (0x1203)
+; CHECK:     OneMethod {
+; CHECK:       TypeLeafKind: LF_ONEMETHOD (0x1511)
+; CHECK:       AccessSpecifier: Public (0x3)
+; CHECK:       Type: void C2Class::() ([[MF3]])
+; CHECK:       Name: ~C2Class
+; CHECK:     }
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: C2Class (C2Class&) ([[SP4]])
+; CHECK:     Name: Func_C2Class
+; CHECK:   }
+; CHECK:   Procedure ([[SP5:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: DClass ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x1)
+; CHECK:       CxxReturnUdt (0x1)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (DClass&) ({{.*}})
+; CHECK:   }
+; CHECK:   FieldList ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FIELDLIST (0x1203)
+; CHECK:     BaseClass {
+; CHECK:       TypeLeafKind: LF_BCLASS (0x1400)
+; CHECK:       AccessSpecifier: Public (0x3)
+; CHECK:       BaseType: BClass ({{.*}})
+; CHECK:       BaseOffset: 0x0
+; CHECK:     }
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: DClass (DClass&) ([[SP5]])
+; CHECK:     Name: Func_DClass
+; CHECK:   }
+; CHECK:   Procedure ([[SP6:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: FClass ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (FClass&) ({{.*}})
+; CHECK:   }
+; CHECK:   FieldList ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FIELDLIST (0x1203)
+; CHECK:     StaticDataMember {
+; CHECK:       TypeLeafKind: LF_STMEMBER (0x150E)
+; CHECK:       AccessSpecifier: Private (0x1)
+; CHECK:       Type: int (0x74)
+; CHECK:       Name: x
+; CHECK:     }
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: FClass (FClass&) ([[SP6]])
+; CHECK:     Name: Func_FClass
+; CHECK:   }
+; CHECK:   Procedure ([[SP7:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: AStruct ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (AStruct&) ({{.*}})
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: AStruct (AStruct&) ([[SP7]])
+; CHECK:     Name: Func_AStruct
+; CHECK:   }
+; CHECK:   Procedure ([[SP8:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: BStruct ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x1)
+; CHECK:       CxxReturnUdt (0x1)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (BStruct&) ({{.*}})
+; CHECK:   }
+; CHECK:   MemberFunction ([[MF4:.*]]) {
+; CHECK:     TypeLeafKind: LF_MFUNCTION (0x1009)
+; CHECK:     ReturnType: void (0x3)
+; CHECK:     ClassType: BStruct ({{.*}})
+; CHECK:     ThisType: BStruct* ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x2)
+; CHECK:       Constructor (0x2)
+; CHECK:     ]
+; CHECK:     NumParameters: 0
+; CHECK:     ArgListType: () ({{.*}})
+; CHECK:     ThisAdjustment: 0
+; CHECK:   }
+; CHECK:   FieldList ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FIELDLIST (0x1203)
+; CHECK:     OneMethod {
+; CHECK:       TypeLeafKind: LF_ONEMETHOD (0x1511)
+; CHECK:       AccessSpecifier: Public (0x3)
+; CHECK:       Type: void BStruct::() ([[MF4]])
+; CHECK:       Name: BStruct
+; CHECK:     }
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: BStruct (BStruct&) ([[SP8]])
+; CHECK:     Name: Func_BStruct
+; CHECK:   }
+; CHECK:   Procedure ([[SP9:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: AUnion ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (AUnion&) ({{.*}})
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: AUnion (AUnion&) ([[SP9]])
+; CHECK:     Name: Func_AUnion
+; CHECK:   }
+; CHECK:   Procedure ([[SP10:.*]]) {
+; CHECK:     TypeLeafKind: LF_PROCEDURE (0x1008)
+; CHECK:     ReturnType: BUnion ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 1
+; CHECK:     ArgListType: (BUnion&) ({{.*}})
+; CHECK:   }
+; CHECK:   MemberFunction ([[MF5:.*]]) {
+; CHECK:     TypeLeafKind: LF_MFUNCTION (0x1009)
+; CHECK:     ReturnType: void (0x3)
+; CHECK:     ClassType: BUnion ({{.*}})
+; CHECK:     ThisType: BUnion* ({{.*}})
+; CHECK:     CallingConvention: NearC (0x0)
+; CHECK:     FunctionOptions [ (0x0)
+; CHECK:     ]
+; CHECK:     NumParameters: 0
+; CHECK:     ArgListType: () ({{.*}})
+; CHECK:     ThisAdjustment: 0
+; CHECK:   }
+; CHECK:   FieldList ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FIELDLIST (0x1203)
+; CHECK:     OneMethod {
+; CHECK:       TypeLeafKind: LF_ONEMETHOD (0x1511)
+; CHECK:       AccessSpecifier: Public (0x3)
+; CHECK:       Type: void BUnion::() ([[MF5]])
+; CHECK:       Name: BUnion
+; CHECK:     }
+; CHECK:   }
+; CHECK:   FuncId ({{.*}}) {
+; CHECK:     TypeLeafKind: LF_FUNC_ID (0x1601)
+; CHECK:     ParentScope: 0x0
+; CHECK:     FunctionType: BUnion (BUnion&) ([[SP10]])
+; CHECK:     Name: Func_BUnion
+; CHECK:   }
+; CHECK: ]
+
+
+; ModuleID = 'function-options.cpp'
+source_filename = "function-options.cpp"
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc19.15.26729"
+
+%class.AClass = type { i8 }
+%class.BClass = type { i8 }
+%class.C1Class = type { i8 }
+%class.C2Class = type { i8 }
+%class.DClass = type { i8 }
+%class.FClass = type { i8 }
+%struct.AStruct = type { i8 }
+%struct.BStruct = type { i8 }
+%union.AUnion = type { i8 }
+%union.BUnion = type { i8 }
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local i8 @"?Func_AClass@@YA?AVAClass@@AEAV1@@Z"(%class.AClass* dereferenceable(1) %arg) #0 !dbg !8 {
+entry:
+  %retval = alloca %class.AClass, align 1
+  %arg.addr = alloca %class.AClass*, align 8
+  store %class.AClass* %arg, %class.AClass** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %class.AClass** %arg.addr, metadata !14, metadata !DIExpression()), !dbg !15
+  %0 = load %class.AClass*, %class.AClass** %arg.addr, align 8, !dbg !15
+  %coerce.dive = getelementptr inbounds %class.AClass, %class.AClass* %retval, i32 0, i32 0, !dbg !15
+  %1 = load i8, i8* %coerce.dive, align 1, !dbg !15
+  ret i8 %1, !dbg !15
+}
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?Func_BClass@@YA?AVBClass@@AEAV1@@Z"(%class.BClass* noalias sret %agg.result, %class.BClass* dereferenceable(1) %arg) #0 !dbg !16 {
+entry:
+  %arg.addr = alloca %class.BClass*, align 8
+  store %class.BClass* %arg, %class.BClass** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %class.BClass** %arg.addr, metadata !26, metadata !DIExpression()), !dbg !27
+  %0 = load %class.BClass*, %class.BClass** %arg.addr, align 8, !dbg !27
+  ret void, !dbg !27
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?Func_C1Class@@YA?AVC1Class@@AEAV1@@Z"(%class.C1Class* noalias sret %agg.result, %class.C1Class* dereferenceable(1) %arg) #0 !dbg !28 {
+entry:
+  %arg.addr = alloca %class.C1Class*, align 8
+  store %class.C1Class* %arg, %class.C1Class** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %class.C1Class** %arg.addr, metadata !38, metadata !DIExpression()), !dbg !39
+  %0 = load %class.C1Class*, %class.C1Class** %arg.addr, align 8, !dbg !39
+  ret void, !dbg !39
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?Func_C2Class@@YA?AVC2Class@@AEAV1@@Z"(%class.C2Class* noalias sret %agg.result, %class.C2Class* dereferenceable(1) %arg) #0 !dbg !40 {
+entry:
+  %arg.addr = alloca %class.C2Class*, align 8
+  store %class.C2Class* %arg, %class.C2Class** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %class.C2Class** %arg.addr, metadata !50, metadata !DIExpression()), !dbg !51
+  %0 = load %class.C2Class*, %class.C2Class** %arg.addr, align 8, !dbg !51
+  ret void, !dbg !51
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?Func_DClass@@YA?AVDClass@@AEAV1@@Z"(%class.DClass* noalias sret %agg.result, %class.DClass* dereferenceable(1) %arg) #0 !dbg !52 {
+entry:
+  %arg.addr = alloca %class.DClass*, align 8
+  store %class.DClass* %arg, %class.DClass** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %class.DClass** %arg.addr, metadata !59, metadata !DIExpression()), !dbg !60
+  %0 = load %class.DClass*, %class.DClass** %arg.addr, align 8, !dbg !60
+  ret void, !dbg !60
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local i8 @"?Func_FClass@@YA?AVFClass@@AEAV1@@Z"(%class.FClass* dereferenceable(1) %arg) #0 !dbg !61 {
+entry:
+  %retval = alloca %class.FClass, align 1
+  %arg.addr = alloca %class.FClass*, align 8
+  store %class.FClass* %arg, %class.FClass** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %class.FClass** %arg.addr, metadata !69, metadata !DIExpression()), !dbg !70
+  %0 = load %class.FClass*, %class.FClass** %arg.addr, align 8, !dbg !70
+  %coerce.dive = getelementptr inbounds %class.FClass, %class.FClass* %retval, i32 0, i32 0, !dbg !70
+  %1 = load i8, i8* %coerce.dive, align 1, !dbg !70
+  ret i8 %1, !dbg !70
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local i8 @"?Func_AStruct@@YA?AUAStruct@@AEAU1@@Z"(%struct.AStruct* dereferenceable(1) %arg) #0 !dbg !71 {
+entry:
+  %retval = alloca %struct.AStruct, align 1
+  %arg.addr = alloca %struct.AStruct*, align 8
+  store %struct.AStruct* %arg, %struct.AStruct** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %struct.AStruct** %arg.addr, metadata !76, metadata !DIExpression()), !dbg !77
+  %0 = load %struct.AStruct*, %struct.AStruct** %arg.addr, align 8, !dbg !77
+  %coerce.dive = getelementptr inbounds %struct.AStruct, %struct.AStruct* %retval, i32 0, i32 0, !dbg !77
+  %1 = load i8, i8* %coerce.dive, align 1, !dbg !77
+  ret i8 %1, !dbg !77
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?Func_BStruct@@YA?AUBStruct@@AEAU1@@Z"(%struct.BStruct* noalias sret %agg.result, %struct.BStruct* dereferenceable(1) %arg) #0 !dbg !78 {
+entry:
+  %arg.addr = alloca %struct.BStruct*, align 8
+  store %struct.BStruct* %arg, %struct.BStruct** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %struct.BStruct** %arg.addr, metadata !88, metadata !DIExpression()), !dbg !89
+  %0 = load %struct.BStruct*, %struct.BStruct** %arg.addr, align 8, !dbg !89
+  ret void, !dbg !89
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local i8 @"?Func_AUnion@@YA?ATAUnion@@AEAT1@@Z"(%union.AUnion* dereferenceable(1) %arg) #0 !dbg !90 {
+entry:
+  %retval = alloca %union.AUnion, align 1
+  %arg.addr = alloca %union.AUnion*, align 8
+  store %union.AUnion* %arg, %union.AUnion** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %union.AUnion** %arg.addr, metadata !95, metadata !DIExpression()), !dbg !96
+  %0 = load %union.AUnion*, %union.AUnion** %arg.addr, align 8, !dbg !96
+  %coerce.dive = getelementptr inbounds %union.AUnion, %union.AUnion* %retval, i32 0, i32 0, !dbg !96
+  %1 = load i8, i8* %coerce.dive, align 1, !dbg !96
+  ret i8 %1, !dbg !96
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?Func_BUnion@@YA?ATBUnion@@AEAT1@@Z"(%union.BUnion* noalias sret %agg.result, %union.BUnion* dereferenceable(1) %arg) #0 !dbg !97 {
+entry:
+  %arg.addr = alloca %union.BUnion*, align 8
+  store %union.BUnion* %arg, %union.BUnion** %arg.addr, align 8
+  call void @llvm.dbg.declare(metadata %union.BUnion** %arg.addr, metadata !107, metadata !DIExpression()), !dbg !108
+  %0 = load %union.BUnion*, %union.BUnion** %arg.addr, align 8, !dbg !108
+  ret void, !dbg !108
+}
+
+attributes #0 = { noinline nounwind optnone 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" }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5, !6}
+!llvm.ident = !{!7}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 (https://github.com/llvm-mirror/clang.git 9884fc1d0881576784e9b50da9eb61a5eb427f1c) (https://github.com/llvm-mirror/llvm.git 33b1a96b81ba4e33cfc4a129ce43b5331e16936b)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "function-options.cpp", directory: "\5Ctest\5CDebugInfo\5CCOFF", checksumkind: CSK_MD5, checksum: "e73e74ea0bd81174051f0a4746343e00")
+!2 = !{}
+!3 = !{i32 2, !"CodeView", i32 1}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 2}
+!6 = !{i32 7, !"PIC Level", i32 2}
+!7 = !{!"clang version 8.0.0 (https://github.com/llvm-mirror/clang.git 9884fc1d0881576784e9b50da9eb61a5eb427f1c) (https://github.com/llvm-mirror/llvm.git 33b1a96b81ba4e33cfc4a129ce43b5331e16936b)"}
+!8 = distinct !DISubprogram(name: "Func_AClass", linkageName: "?Func_AClass@@YA?AVAClass@@AEAV1@@Z", scope: !9, file: !9, line: 6, type: !10, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!9 = !DIFile(filename: "function-options.cpp", directory: "D:\5Cupstream\5Cllvm\5Ctest\5CDebugInfo\5CCOFF")
+!10 = !DISubroutineType(types: !11)
+!11 = !{!12, !13}
+!12 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "AClass", file: !9, line: 5, size: 8, flags: DIFlagTypePassByValue | DIFlagTrivial, elements: !2, identifier: ".?AVAClass@@")
+!13 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !12, size: 64)
+!14 = !DILocalVariable(name: "arg", arg: 1, scope: !8, file: !9, line: 6, type: !13)
+!15 = !DILocation(line: 6, scope: !8)
+!16 = distinct !DISubprogram(name: "Func_BClass", linkageName: "?Func_BClass@@YA?AVBClass@@AEAV1@@Z", scope: !9, file: !9, line: 12, type: !17, isLocal: false, isDefinition: true, scopeLine: 12, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!17 = !DISubroutineType(types: !18)
+!18 = !{!19, !25}
+!19 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "BClass", file: !9, line: 8, size: 8, flags: DIFlagTypePassByValue, elements: !20, identifier: ".?AVBClass@@")
+!20 = !{!21}
+!21 = !DISubprogram(name: "BClass", scope: !19, file: !9, line: 10, type: !22, isLocal: false, isDefinition: false, scopeLine: 10, flags: DIFlagExplicit | DIFlagPrototyped, isOptimized: false)
+!22 = !DISubroutineType(types: !23)
+!23 = !{null, !24}
+!24 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!25 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !19, size: 64)
+!26 = !DILocalVariable(name: "arg", arg: 1, scope: !16, file: !9, line: 12, type: !25)
+!27 = !DILocation(line: 12, scope: !16)
+!28 = distinct !DISubprogram(name: "Func_C1Class", linkageName: "?Func_C1Class@@YA?AVC1Class@@AEAV1@@Z", scope: !9, file: !9, line: 18, type: !29, isLocal: false, isDefinition: true, scopeLine: 18, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!29 = !DISubroutineType(types: !30)
+!30 = !{!31, !37}
+!31 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "C1Class", file: !9, line: 14, size: 8, flags: DIFlagTypePassByValue | DIFlagTrivial, elements: !32, identifier: ".?AVC1Class@@")
+!32 = !{!33}
+!33 = !DISubprogram(name: "C1Class", scope: !31, file: !9, line: 16, type: !34, isLocal: false, isDefinition: false, scopeLine: 16, flags: DIFlagPublic | DIFlagPrototyped, isOptimized: false)
+!34 = !DISubroutineType(types: !35)
+!35 = !{null, !36}
+!36 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !31, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!37 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !31, size: 64)
+!38 = !DILocalVariable(name: "arg", arg: 1, scope: !28, file: !9, line: 18, type: !37)
+!39 = !DILocation(line: 18, scope: !28)
+!40 = distinct !DISubprogram(name: "Func_C2Class", linkageName: "?Func_C2Class@@YA?AVC2Class@@AEAV1@@Z", scope: !9, file: !9, line: 24, type: !41, isLocal: false, isDefinition: true, scopeLine: 24, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!41 = !DISubroutineType(types: !42)
+!42 = !{!43, !49}
+!43 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "C2Class", file: !9, line: 20, size: 8, flags: DIFlagTypePassByValue, elements: !44, identifier: ".?AVC2Class@@")
+!44 = !{!45}
+!45 = !DISubprogram(name: "~C2Class", scope: !43, file: !9, line: 22, type: !46, isLocal: false, isDefinition: false, scopeLine: 22, flags: DIFlagPublic | DIFlagPrototyped, isOptimized: false)
+!46 = !DISubroutineType(types: !47)
+!47 = !{null, !48}
+!48 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !43, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!49 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !43, size: 64)
+!50 = !DILocalVariable(name: "arg", arg: 1, scope: !40, file: !9, line: 24, type: !49)
+!51 = !DILocation(line: 24, scope: !40)
+!52 = distinct !DISubprogram(name: "Func_DClass", linkageName: "?Func_DClass@@YA?AVDClass@@AEAV1@@Z", scope: !9, file: !9, line: 27, type: !53, isLocal: false, isDefinition: true, scopeLine: 27, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!53 = !DISubroutineType(types: !54)
+!54 = !{!55, !58}
+!55 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "DClass", file: !9, line: 26, size: 8, flags: DIFlagTypePassByValue, elements: !56, identifier: ".?AVDClass@@")
+!56 = !{!57}
+!57 = !DIDerivedType(tag: DW_TAG_inheritance, scope: !55, baseType: !19, flags: DIFlagPublic, extraData: i32 0)
+!58 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !55, size: 64)
+!59 = !DILocalVariable(name: "arg", arg: 1, scope: !52, file: !9, line: 27, type: !58)
+!60 = !DILocation(line: 27, scope: !52)
+!61 = distinct !DISubprogram(name: "Func_FClass", linkageName: "?Func_FClass@@YA?AVFClass@@AEAV1@@Z", scope: !9, file: !9, line: 30, type: !62, isLocal: false, isDefinition: true, scopeLine: 30, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!62 = !DISubroutineType(types: !63)
+!63 = !{!64, !68}
+!64 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "FClass", file: !9, line: 29, size: 8, flags: DIFlagTypePassByValue | DIFlagTrivial, elements: !65, identifier: ".?AVFClass@@")
+!65 = !{!66}
+!66 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !64, file: !9, line: 29, baseType: !67, flags: DIFlagStaticMember)
+!67 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!68 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !64, size: 64)
+!69 = !DILocalVariable(name: "arg", arg: 1, scope: !61, file: !9, line: 30, type: !68)
+!70 = !DILocation(line: 30, scope: !61)
+!71 = distinct !DISubprogram(name: "Func_AStruct", linkageName: "?Func_AStruct@@YA?AUAStruct@@AEAU1@@Z", scope: !9, file: !9, line: 33, type: !72, isLocal: false, isDefinition: true, scopeLine: 33, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!72 = !DISubroutineType(types: !73)
+!73 = !{!74, !75}
+!74 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "AStruct", file: !9, line: 32, size: 8, flags: DIFlagTypePassByValue | DIFlagTrivial, elements: !2, identifier: ".?AUAStruct@@")
+!75 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !74, size: 64)
+!76 = !DILocalVariable(name: "arg", arg: 1, scope: !71, file: !9, line: 33, type: !75)
+!77 = !DILocation(line: 33, scope: !71)
+!78 = distinct !DISubprogram(name: "Func_BStruct", linkageName: "?Func_BStruct@@YA?AUBStruct@@AEAU1@@Z", scope: !9, file: !9, line: 36, type: !79, isLocal: false, isDefinition: true, scopeLine: 36, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!79 = !DISubroutineType(types: !80)
+!80 = !{!81, !87}
+!81 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "BStruct", file: !9, line: 35, size: 8, flags: DIFlagTypePassByValue, elements: !82, identifier: ".?AUBStruct@@")
+!82 = !{!83}
+!83 = !DISubprogram(name: "BStruct", scope: !81, file: !9, line: 35, type: !84, isLocal: false, isDefinition: false, scopeLine: 35, flags: DIFlagPrototyped, isOptimized: false)
+!84 = !DISubroutineType(types: !85)
+!85 = !{null, !86}
+!86 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !81, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!87 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !81, size: 64)
+!88 = !DILocalVariable(name: "arg", arg: 1, scope: !78, file: !9, line: 36, type: !87)
+!89 = !DILocation(line: 36, scope: !78)
+!90 = distinct !DISubprogram(name: "Func_AUnion", linkageName: "?Func_AUnion@@YA?ATAUnion@@AEAT1@@Z", scope: !9, file: !9, line: 39, type: !91, isLocal: false, isDefinition: true, scopeLine: 39, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!91 = !DISubroutineType(types: !92)
+!92 = !{!93, !94}
+!93 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "AUnion", file: !9, line: 38, size: 8, flags: DIFlagTypePassByValue | DIFlagTrivial, elements: !2, identifier: ".?ATAUnion@@")
+!94 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !93, size: 64)
+!95 = !DILocalVariable(name: "arg", arg: 1, scope: !90, file: !9, line: 39, type: !94)
+!96 = !DILocation(line: 39, scope: !90)
+!97 = distinct !DISubprogram(name: "Func_BUnion", linkageName: "?Func_BUnion@@YA?ATBUnion@@AEAT1@@Z", scope: !9, file: !9, line: 42, type: !98, isLocal: false, isDefinition: true, scopeLine: 42, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!98 = !DISubroutineType(types: !99)
+!99 = !{!100, !106}
+!100 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "BUnion", file: !9, line: 41, size: 8, flags: DIFlagTypePassByValue | DIFlagTrivial, elements: !101, identifier: ".?ATBUnion@@")
+!101 = !{!102}
+!102 = !DISubprogram(name: "BUnion", scope: !100, file: !9, line: 41, type: !103, isLocal: false, isDefinition: false, scopeLine: 41, flags: DIFlagPrototyped, isOptimized: false)
+!103 = !DISubroutineType(types: !104)
+!104 = !{null, !105}
+!105 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !100, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!106 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !100, size: 64)
+!107 = !DILocalVariable(name: "arg", arg: 1, scope: !97, file: !9, line: 42, type: !106)
+!108 = !DILocation(line: 42, scope: !97)

llvm/trunk/test/DebugInfo/COFF/global-type-hashes.ll

 ; YAML:         ArgList:
 ; YAML:           ArgIndices:      [ 116, 116 ]
 ; YAML:       - Kind:            LF_MFUNCTION
 ; YAML:         MemberFunction:
 ; YAML:           ReturnType:      3
 ; YAML:           ClassType:       4100
 ; YAML:           ThisType:        4101
 ; YAML:           CallConv:        ThisCall
-; YAML:           Options:         [ None ]
+; YAML:           Options:         [ None, Constructor ]
 ; YAML:           ParameterCount:  2
 ; YAML:           ArgumentList:    4102
 ; YAML:           ThisPointerAdjustment: 0
 ; YAML:       - Kind:            LF_ARGLIST
 ; YAML:         ArgList:
 ; YAML:           ArgIndices:      [  ]
 ; YAML:       - Kind:            LF_MFUNCTION
 ; YAML:         MemberFunction:

 ; YAML:       HashValues:
 ; YAML:         - 800309EE1ED8BB5B
 ; YAML:         - 5397319F1CC14E2C
 ; YAML:         - DF04AA3125BBC50E
 ; YAML:         - 95CEBA304A2C4493
 ; YAML:         - C324F82D24D22283
 ; YAML:         - 74698BE366891D3D
 ; YAML:         - DDE23757322DB7C3
-; YAML:         - 3C458A5105FEA7C1
+; YAML:         - 1692305447C3D360
 ; YAML:         - D341E2F9BE57A1C7
 ; YAML:         - 243F76AED6D8FB79
-; YAML:         - B038D36C0C67EEEA
-; YAML:         - C0A51CE268B50087
+; YAML:         - C75E2FD5D79D363D
+; YAML:         - 30FB9353B361B4B8
 ; YAML:         - 0634944401BCC520
-; YAML:         - 8CFC595FACFE1AB2
-; YAML:         - F1795EA10053AC52
+; YAML:         - DF0B7BE0B5AD5B4F
+; YAML:         - 0916E74F3860DA92
 ; YAML:         - 17D3CDC3384402DD
 ; ...
 
 
 ; ASM:      .section        .debug$H,"dr"
 ; ASM-NEXT: .p2align        2
 ; ASM-NEXT: .long   20171205                # Magic
 ; ASM-NEXT: .short  0                       # Section Version
 ; ASM-NEXT: .short  1                       # Hash Algorithm
 ; ASM-NEXT: .byte   0x80, 0x03, 0x09, 0xee  # 0x1000 [800309EE1ED8BB5B]
 ; ASM-NEXT: .byte   0x1e, 0xd8, 0xbb, 0x5b
 ; ASM-NEXT: .byte   0x53, 0x97, 0x31, 0x9f  # 0x1001 [5397319F1CC14E2C]
 ; ASM-NEXT: .byte   0x1c, 0xc1, 0x4e, 0x2c
 ; ASM-NEXT: .byte   0xdf, 0x04, 0xaa, 0x31  # 0x1002 [DF04AA3125BBC50E]