IRGen: Remove StructorType; thread GlobalDecl through more code. NFCI.

[pcc]

Summary

This should make it easier to add more structor variants.

[rjmccall]

LGTM.

clang/include/clang/AST/GlobalDecl.h

public:
   }
 
   GlobalDecl getWithDecl(const Decl *D) {
     GlobalDecl Result(*this);
     Result.Value.setPointer(D);
     return Result;
   }
 
+  GlobalDecl getWithCtorType(CXXCtorType Type) {
+    assert(isa<CXXConstructorDecl>(getDecl()));
+    GlobalDecl Result(*this);
+    Result.Value.setInt(Type);
+    return Result;
+  }
+
+  GlobalDecl getWithDtorType(CXXDtorType Type) {
+    assert(isa<CXXDestructorDecl>(getDecl()));
+    GlobalDecl Result(*this);
+    Result.Value.setInt(Type);
+    return Result;
+  }
+
   GlobalDecl getWithMultiVersionIndex(unsigned Index) {
     assert(isa<FunctionDecl>(getDecl()) &&
            !isa<CXXConstructorDecl>(getDecl()) &&
            !isa<CXXDestructorDecl>(getDecl()) &&
            "Decl is not a plain FunctionDecl!");
     GlobalDecl Result(*this);
     Result.MultiVersionIndex = Index;
     return Result;

clang/lib/CodeGen/CGCXX.cpp

bool CodeGenModule::TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D) {
   }
 
   // Finally, set up the alias with its proper name and attributes.
   SetCommonAttributes(AliasDecl, Alias);
 
   return false;
 }
 
-llvm::Function *CodeGenModule::codegenCXXStructor(const CXXMethodDecl *MD,
-                                                  StructorType Type) {
-  const CGFunctionInfo &FnInfo =
-      getTypes().arrangeCXXStructorDeclaration(MD, Type);
+llvm::Function *CodeGenModule::codegenCXXStructor(GlobalDecl GD) {
+  const CGFunctionInfo &FnInfo = getTypes().arrangeCXXStructorDeclaration(GD);
   auto *Fn = cast<llvm::Function>(
-      getAddrOfCXXStructor(MD, Type, &FnInfo, /*FnType=*/nullptr,
+      getAddrOfCXXStructor(GD, &FnInfo, /*FnType=*/nullptr,
                            /*DontDefer=*/true, ForDefinition));
 
-  GlobalDecl GD;
-  if (const auto *DD = dyn_cast<CXXDestructorDecl>(MD)) {
-    GD = GlobalDecl(DD, toCXXDtorType(Type));
-  } else {
-    const auto *CD = cast<CXXConstructorDecl>(MD);
-    GD = GlobalDecl(CD, toCXXCtorType(Type));
-  }
-
   setFunctionLinkage(GD, Fn);
 
   CodeGenFunction(*this).GenerateCode(GD, Fn, FnInfo);
   setNonAliasAttributes(GD, Fn);
-  SetLLVMFunctionAttributesForDefinition(MD, Fn);
+  SetLLVMFunctionAttributesForDefinition(cast<CXXMethodDecl>(GD.getDecl()), Fn);
   return Fn;
 }
 
 llvm::FunctionCallee CodeGenModule::getAddrAndTypeOfCXXStructor(
-    const CXXMethodDecl *MD, StructorType Type, const CGFunctionInfo *FnInfo,
-    llvm::FunctionType *FnType, bool DontDefer,
-    ForDefinition_t IsForDefinition) {
-
-  GlobalDecl GD;
-  if (auto *CD = dyn_cast<CXXConstructorDecl>(MD)) {
-    GD = GlobalDecl(CD, toCXXCtorType(Type));
-  } else {
+    GlobalDecl GD, const CGFunctionInfo *FnInfo, llvm::FunctionType *FnType,
+    bool DontDefer, ForDefinition_t IsForDefinition) {
+  auto *MD = cast<CXXMethodDecl>(GD.getDecl());
+
+  if (auto *DD = dyn_cast<CXXDestructorDecl>(MD)) {
     // Always alias equivalent complete destructors to base destructors in the
     // MS ABI.
     if (getTarget().getCXXABI().isMicrosoft() &&
-        Type == StructorType::Complete && MD->getParent()->getNumVBases() == 0)
-      Type = StructorType::Base;
-    GD = GlobalDecl(cast<CXXDestructorDecl>(MD), toCXXDtorType(Type));
+        GD.getDtorType() == Dtor_Complete &&
+        MD->getParent()->getNumVBases() == 0)
+      GD = GD.getWithDtorType(Dtor_Base);
   }
 
   if (!FnType) {
     if (!FnInfo)
-      FnInfo = &getTypes().arrangeCXXStructorDeclaration(MD, Type);
+      FnInfo = &getTypes().arrangeCXXStructorDeclaration(GD);
     FnType = getTypes().GetFunctionType(*FnInfo);
   }
 
   llvm::Constant *Ptr = GetOrCreateLLVMFunction(
       getMangledName(GD), FnType, GD, /*ForVTable=*/false, DontDefer,
       /*isThunk=*/false, /*ExtraAttrs=*/llvm::AttributeList(), IsForDefinition);
   return {FnType, Ptr};
 }

 CGCallee
 CodeGenFunction::BuildAppleKextVirtualDestructorCall(
                                             const CXXDestructorDecl *DD,
                                             CXXDtorType Type,
                                             const CXXRecordDecl *RD) {
   assert(DD->isVirtual() && Type != Dtor_Base);
   // Compute the function type we're calling.
   const CGFunctionInfo &FInfo = CGM.getTypes().arrangeCXXStructorDeclaration(
-      DD, StructorType::Complete);
+      GlobalDecl(DD, Dtor_Complete));
   llvm::Type *Ty = CGM.getTypes().GetFunctionType(FInfo);
   return ::BuildAppleKextVirtualCall(*this, GlobalDecl(DD, Type), Ty, RD);
 }

clang/lib/CodeGen/CGCXXABI.h

struct AddedStructorArgs {
     static AddedStructorArgs prefix(unsigned N) { return {N, 0}; }
     static AddedStructorArgs suffix(unsigned N) { return {0, N}; }
   };
 
   /// Build the signature of the given constructor or destructor variant by
   /// adding any required parameters.  For convenience, ArgTys has been
   /// initialized with the type of 'this'.
   virtual AddedStructorArgs
-  buildStructorSignature(const CXXMethodDecl *MD, StructorType T,
+  buildStructorSignature(GlobalDecl GD,
                          SmallVectorImpl<CanQualType> &ArgTys) = 0;
 
   /// Returns true if the given destructor type should be emitted as a linkonce
   /// delegating thunk, regardless of whether the dtor is defined in this TU or
   /// not.
   virtual bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor,
                                       CXXDtorType DT) const = 0;
 
public:
   /// triggering the initialization of all thread_local variables in its
   /// translation unit).
   virtual LValue EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF,
                                               const VarDecl *VD,
                                               QualType LValType) = 0;
 
   /// Emit a single constructor/destructor with the given type from a C++
   /// constructor Decl.
-  virtual void emitCXXStructor(const CXXMethodDecl *MD, StructorType Type) = 0;
+  virtual void emitCXXStructor(GlobalDecl GD) = 0;
 
   /// Load a vtable from This, an object of polymorphic type RD, or from one of
   /// its virtual bases if it does not have its own vtable. Returns the vtable
   /// and the class from which the vtable was loaded.
   virtual std::pair<llvm::Value *, const CXXRecordDecl *>
   LoadVTablePtr(CodeGenFunction &CGF, Address This,
                 const CXXRecordDecl *RD) = 0;
 };

clang/lib/CodeGen/CGCall.cpp

 
 bool CodeGenTypes::inheritingCtorHasParams(
     const InheritedConstructor &Inherited, CXXCtorType Type) {
   // Parameters are unnecessary if we're constructing a base class subobject
   // and the inherited constructor lives in a virtual base.
   return Type == Ctor_Complete ||
          !Inherited.getShadowDecl()->constructsVirtualBase() ||
          !Target.getCXXABI().hasConstructorVariants();
-  }
 
 const CGFunctionInfo &
-CodeGenTypes::arrangeCXXStructorDeclaration(const CXXMethodDecl *MD,
-                                            StructorType Type) {
+CodeGenTypes::arrangeCXXStructorDeclaration(GlobalDecl GD) {
+  auto *MD = cast<CXXMethodDecl>(GD.getDecl());
 
   SmallVector<CanQualType, 16> argTypes;
   SmallVector<FunctionProtoType::ExtParameterInfo, 16> paramInfos;
   argTypes.push_back(DeriveThisType(MD->getParent(), MD));
 
   bool PassParams = true;
 
-  GlobalDecl GD;
   if (auto *CD = dyn_cast<CXXConstructorDecl>(MD)) {
-    GD = GlobalDecl(CD, toCXXCtorType(Type));
-
     // A base class inheriting constructor doesn't get forwarded arguments
     // needed to construct a virtual base (or base class thereof).
     if (auto Inherited = CD->getInheritedConstructor())
-      PassParams = inheritingCtorHasParams(Inherited, toCXXCtorType(Type));
-  } else {
-    auto *DD = dyn_cast<CXXDestructorDecl>(MD);
-    GD = GlobalDecl(DD, toCXXDtorType(Type));
+      PassParams = inheritingCtorHasParams(Inherited, GD.getCtorType());
   }
 
   CanQual<FunctionProtoType> FTP = GetFormalType(MD);
 
   // Add the formal parameters.
   if (PassParams)
     appendParameterTypes(*this, argTypes, paramInfos, FTP);
 
   CGCXXABI::AddedStructorArgs AddedArgs =
-      TheCXXABI.buildStructorSignature(MD, Type, argTypes);
+      TheCXXABI.buildStructorSignature(GD, argTypes);
   if (!paramInfos.empty()) {
     // Note: prefix implies after the first param.
     if (AddedArgs.Prefix)
       paramInfos.insert(paramInfos.begin() + 1, AddedArgs.Prefix,
                         FunctionProtoType::ExtParameterInfo{});
     if (AddedArgs.Suffix)
       paramInfos.append(AddedArgs.Suffix,
                         FunctionProtoType::ExtParameterInfo{});
return arrangeLLVMFunctionInfo(
       /*chainCall=*/false, argTypes, einfo, {}, RequiredArgs::All);
 }
 
 const CGFunctionInfo &
 CodeGenTypes::arrangeGlobalDeclaration(GlobalDecl GD) {
   // FIXME: Do we need to handle ObjCMethodDecl?
   const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
 
-  if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD))
-    return arrangeCXXStructorDeclaration(CD, getFromCtorType(GD.getCtorType()));
-
-  if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD))
-    return arrangeCXXStructorDeclaration(DD, getFromDtorType(GD.getDtorType()));
+  if (isa<CXXConstructorDecl>(GD.getDecl()) ||
+      isa<CXXDestructorDecl>(GD.getDecl()))
+    return arrangeCXXStructorDeclaration(GD);
 
   return arrangeFunctionDeclaration(FD);
 }
 
 /// Arrange a thunk that takes 'this' as the first parameter followed by
 /// varargs.  Return a void pointer, regardless of the actual return type.
 /// The body of the thunk will end in a musttail call to a function of the
 /// correct type, and the caller will bitcast the function to the correct

 
 llvm::Type *CodeGenTypes::GetFunctionTypeForVTable(GlobalDecl GD) {
   const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
   const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
 
   if (!isFuncTypeConvertible(FPT))
     return llvm::StructType::get(getLLVMContext());
 
-  const CGFunctionInfo *Info;
-  if (isa<CXXDestructorDecl>(MD))
-    Info =
-        &arrangeCXXStructorDeclaration(MD, getFromDtorType(GD.getDtorType()));
-  else
-    Info = &arrangeCXXMethodDeclaration(MD);
-  return GetFunctionType(*Info);
+  return GetFunctionType(GD);
 }
 
 static void AddAttributesFromFunctionProtoType(ASTContext &Ctx,
                                                llvm::AttrBuilder &FuncAttrs,
                                                const FunctionProtoType *FPT) {
   if (!FPT)
     return;
 

clang/lib/CodeGen/CGClass.cpp

void CodeGenFunction::EmitCXXConstructorCall(const CXXConstructorDecl *D,
   }
 
   // Insert any ABI-specific implicit constructor arguments.
   CGCXXABI::AddedStructorArgs ExtraArgs =
       CGM.getCXXABI().addImplicitConstructorArgs(*this, D, Type, ForVirtualBase,
                                                  Delegating, Args);
 
   // Emit the call.
-  llvm::Constant *CalleePtr =
-    CGM.getAddrOfCXXStructor(D, getFromCtorType(Type));
+  llvm::Constant *CalleePtr = CGM.getAddrOfCXXStructor(GlobalDecl(D, Type));
   const CGFunctionInfo &Info = CGM.getTypes().arrangeCXXConstructorCall(
       Args, D, Type, ExtraArgs.Prefix, ExtraArgs.Suffix, PassPrototypeArgs);
   CGCallee Callee = CGCallee::forDirect(CalleePtr, GlobalDecl(D, Type));
   EmitCall(Info, Callee, ReturnValueSlot(), Args);
 
   // Generate vtable assumptions if we're constructing a complete object
   // with a vtable.  We don't do this for base subobjects for two reasons:
   // first, it's incorrect for classes with virtual bases, and second, we're

clang/lib/CodeGen/CGDeclCXX.cpp

static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D,
   // If __cxa_atexit is disabled via a flag, a different helper function is
   // generated elsewhere which uses atexit instead, and it takes the destructor
   // directly.
   bool UsingExternalHelper = !CGM.getCodeGenOpts().CXAAtExit;
   if (Record && (CanRegisterDestructor || UsingExternalHelper)) {
     assert(!Record->hasTrivialDestructor());
     CXXDestructorDecl *Dtor = Record->getDestructor();
 
-    Func = CGM.getAddrAndTypeOfCXXStructor(Dtor, StructorType::Complete);
+    Func = CGM.getAddrAndTypeOfCXXStructor(GlobalDecl(Dtor, Dtor_Complete));
     Argument = llvm::ConstantExpr::getBitCast(
         Addr.getPointer(), CGF.getTypes().ConvertType(Type)->getPointerTo());
 
   // Otherwise, the standard logic requires a helper function.
   } else {
     Func = CodeGenFunction(CGM)
            .generateDestroyHelper(Addr, Type, CGF.getDestroyer(DtorKind),
                                   CGF.needsEHCleanup(DtorKind), &D);

clang/lib/CodeGen/CGExpr.cpp

case SD_Thread: {
     llvm::Constant *CleanupArg;
     if (E->getType()->isArrayType()) {
       CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
           ReferenceTemporary, E->getType(),
           CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
           dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
       CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
     } else {
-      CleanupFn = CGF.CGM.getAddrAndTypeOfCXXStructor(ReferenceTemporaryDtor,
-                                                      StructorType::Complete);
+      CleanupFn = CGF.CGM.getAddrAndTypeOfCXXStructor(
+          GlobalDecl(ReferenceTemporaryDtor, Dtor_Complete));
       CleanupArg = cast<llvm::Constant>(ReferenceTemporary.getPointer());
     }
     CGF.CGM.getCXXABI().registerGlobalDtor(
         CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
     break;
   }
 
   case SD_FullExpression:

clang/lib/CodeGen/CGExprCXX.cpp

MemberCallInfo CallInfo = commonEmitCXXMemberOrOperatorCall(
       *this, MD, This, ImplicitParam, ImplicitParamTy, CE, Args, RtlArgs);
   auto &FnInfo = CGM.getTypes().arrangeCXXMethodCall(
       Args, FPT, CallInfo.ReqArgs, CallInfo.PrefixSize);
   return EmitCall(FnInfo, Callee, ReturnValue, Args, nullptr,
                   CE ? CE->getExprLoc() : SourceLocation());
 }
 
 RValue CodeGenFunction::EmitCXXDestructorCall(
-    const CXXDestructorDecl *DD, const CGCallee &Callee, llvm::Value *This,
-    llvm::Value *ImplicitParam, QualType ImplicitParamTy, const CallExpr *CE,
-    StructorType Type) {
+    GlobalDecl Dtor, const CGCallee &Callee, llvm::Value *This,
+    llvm::Value *ImplicitParam, QualType ImplicitParamTy, const CallExpr *CE) {
   CallArgList Args;
-  commonEmitCXXMemberOrOperatorCall(*this, DD, This, ImplicitParam,
-                                    ImplicitParamTy, CE, Args, nullptr);
-  return EmitCall(CGM.getTypes().arrangeCXXStructorDeclaration(DD, Type),
-                  Callee, ReturnValueSlot(), Args);
+  commonEmitCXXMemberOrOperatorCall(*this, cast<CXXMethodDecl>(Dtor.getDecl()),
+                                    This, ImplicitParam, ImplicitParamTy, CE,
+                                    Args, nullptr);
+  return EmitCall(CGM.getTypes().arrangeCXXStructorDeclaration(Dtor), Callee,
+                  ReturnValueSlot(), Args);
 }
 
 RValue CodeGenFunction::EmitCXXPseudoDestructorExpr(
                                             const CXXPseudoDestructorExpr *E) {
   QualType DestroyedType = E->getDestroyedType();
   if (DestroyedType.hasStrongOrWeakObjCLifetime()) {
     // Automatic Reference Counting:
     //   If the pseudo-expression names a retainable object with weak or
RValue CodeGenFunction::EmitCXXMemberOrOperatorMemberCallExpr(
   }
 
   // Compute the function type we're calling.
   const CXXMethodDecl *CalleeDecl =
       DevirtualizedMethod ? DevirtualizedMethod : MD;
   const CGFunctionInfo *FInfo = nullptr;
   if (const auto *Dtor = dyn_cast<CXXDestructorDecl>(CalleeDecl))
     FInfo = &CGM.getTypes().arrangeCXXStructorDeclaration(
-        Dtor, StructorType::Complete);
+        GlobalDecl(Dtor, Dtor_Complete));
   else
     FInfo = &CGM.getTypes().arrangeCXXMethodDeclaration(CalleeDecl);
 
   llvm::FunctionType *Ty = CGM.getTypes().GetFunctionType(*FInfo);
 
   // C++11 [class.mfct.non-static]p2:
   //   If a non-static member function of a class X is called for an object that
   //   is not of type X, or of a type derived from X, the behavior is undefined.
if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(CalleeDecl)) {
     assert(CE->arg_begin() == CE->arg_end() &&
            "Destructor shouldn't have explicit parameters");
     assert(ReturnValue.isNull() && "Destructor shouldn't have return value");
     if (UseVirtualCall) {
       CGM.getCXXABI().EmitVirtualDestructorCall(
           *this, Dtor, Dtor_Complete, This.getAddress(),
           cast<CXXMemberCallExpr>(CE));
     } else {
+      GlobalDecl GD(Dtor, Dtor_Complete);
       CGCallee Callee;
       if (getLangOpts().AppleKext && Dtor->isVirtual() && HasQualifier)
         Callee = BuildAppleKextVirtualCall(Dtor, Qualifier, Ty);
       else if (!DevirtualizedMethod)
-        Callee = CGCallee::forDirect(
-            CGM.getAddrOfCXXStructor(Dtor, StructorType::Complete, FInfo, Ty),
-            GlobalDecl(Dtor, Dtor_Complete));
+        Callee =
+            CGCallee::forDirect(CGM.getAddrOfCXXStructor(GD, FInfo, Ty), GD);
       else {
-        Callee = CGCallee::forDirect(
-            CGM.GetAddrOfFunction(GlobalDecl(Dtor, Dtor_Complete), Ty),
-            GlobalDecl(Dtor, Dtor_Complete));
+        Callee = CGCallee::forDirect(CGM.GetAddrOfFunction(GD, Ty), GD);
       }
 
-      EmitCXXDestructorCall(Dtor, Callee, This.getPointer(),
+      EmitCXXDestructorCall(GD, Callee, This.getPointer(),
                             /*ImplicitParam=*/nullptr,
-                            /*ImplicitParamTy=*/QualType(), nullptr,
-                            getFromDtorType(Dtor_Complete));
+                            /*ImplicitParamTy=*/QualType(), nullptr);
     }
     return RValue::get(nullptr);
   }
 
   // FIXME: Uses of 'MD' past this point need to be audited. We may need to use
   // 'CalleeDecl' instead.
 
   CGCallee Callee;

clang/lib/CodeGen/CodeGenFunction.h

public:
 
   RValue
   EmitCXXMemberOrOperatorCall(const CXXMethodDecl *Method,
                               const CGCallee &Callee,
                               ReturnValueSlot ReturnValue, llvm::Value *This,
                               llvm::Value *ImplicitParam,
                               QualType ImplicitParamTy, const CallExpr *E,
                               CallArgList *RtlArgs);
-  RValue EmitCXXDestructorCall(const CXXDestructorDecl *DD,
+  RValue EmitCXXDestructorCall(GlobalDecl Dtor,
                                const CGCallee &Callee,
                                llvm::Value *This, llvm::Value *ImplicitParam,
-                               QualType ImplicitParamTy, const CallExpr *E,
-                               StructorType Type);
+                               QualType ImplicitParamTy, const CallExpr *E);
   RValue EmitCXXMemberCallExpr(const CXXMemberCallExpr *E,
                                ReturnValueSlot ReturnValue);
   RValue EmitCXXMemberOrOperatorMemberCallExpr(const CallExpr *CE,
                                                const CXXMethodDecl *MD,
                                                ReturnValueSlot ReturnValue,
                                                bool HasQualifier,
                                                NestedNameSpecifier *Qualifier,
                                                bool IsArrow, const Expr *Base);

clang/lib/CodeGen/CodeGenModule.h

public:
 
   /// Retrieve the record type that describes the state of an
   /// Objective-C fast enumeration loop (for..in).
   QualType getObjCFastEnumerationStateType();
 
   // Produce code for this constructor/destructor. This method doesn't try
   // to apply any ABI rules about which other constructors/destructors
   // are needed or if they are alias to each other.
-  llvm::Function *codegenCXXStructor(const CXXMethodDecl *MD,
-                                     StructorType Type);
+  llvm::Function *codegenCXXStructor(GlobalDecl GD);
 
   /// Return the address of the constructor/destructor of the given type.
   llvm::Constant *
-  getAddrOfCXXStructor(const CXXMethodDecl *MD, StructorType Type,
-                       const CGFunctionInfo *FnInfo = nullptr,
+  getAddrOfCXXStructor(GlobalDecl GD, const CGFunctionInfo *FnInfo = nullptr,
                        llvm::FunctionType *FnType = nullptr,
                        bool DontDefer = false,
                        ForDefinition_t IsForDefinition = NotForDefinition) {
-    return cast<llvm::Constant>(getAddrAndTypeOfCXXStructor(MD, Type, FnInfo,
-                                                            FnType, DontDefer,
+    return cast<llvm::Constant>(getAddrAndTypeOfCXXStructor(GD, FnInfo, FnType,
+                                                            DontDefer,
                                                             IsForDefinition)
                                     .getCallee());
   }
 
   llvm::FunctionCallee getAddrAndTypeOfCXXStructor(
-      const CXXMethodDecl *MD, StructorType Type,
-      const CGFunctionInfo *FnInfo = nullptr,
+      GlobalDecl GD, const CGFunctionInfo *FnInfo = nullptr,
       llvm::FunctionType *FnType = nullptr, bool DontDefer = false,
       ForDefinition_t IsForDefinition = NotForDefinition);
 
   /// Given a builtin id for a function like "__builtin_fabsf", return a
   /// Function* for "fabsf".
   llvm::Constant *getBuiltinLibFunction(const FunctionDecl *FD,
                                         unsigned BuiltinID);
 

clang/lib/CodeGen/CodeGenModule.cpp

if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
     // At -O0, don't generate IR for functions with available_externally
     // linkage.
     if (!shouldEmitFunction(GD))
       return;
 
     if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
       // Make sure to emit the definition(s) before we emit the thunks.
       // This is necessary for the generation of certain thunks.
-      if (const auto *CD = dyn_cast<CXXConstructorDecl>(Method))
-        ABI->emitCXXStructor(CD, getFromCtorType(GD.getCtorType()));
-      else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Method))
-        ABI->emitCXXStructor(DD, getFromDtorType(GD.getDtorType()));
+      if (isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method))
+        ABI->emitCXXStructor(GD);
       else if (FD->isMultiVersion())
         EmitMultiVersionFunctionDefinition(GD, GV);
       else
         EmitGlobalFunctionDefinition(GD, GV);
 
       if (Method->isVirtual())
         getVTables().EmitThunks(GD);
 
CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
 
   return GV;
 }
 
 llvm::Constant *
 CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
                                ForDefinition_t IsForDefinition) {
   const Decl *D = GD.getDecl();
-  if (isa<CXXConstructorDecl>(D))
-    return getAddrOfCXXStructor(cast<CXXConstructorDecl>(D),
-                                getFromCtorType(GD.getCtorType()),
-                                /*FnInfo=*/nullptr, /*FnType=*/nullptr,
-                                /*DontDefer=*/false, IsForDefinition);
-  else if (isa<CXXDestructorDecl>(D))
-    return getAddrOfCXXStructor(cast<CXXDestructorDecl>(D),
-                                getFromDtorType(GD.getDtorType()),
-                                /*FnInfo=*/nullptr, /*FnType=*/nullptr,
+  if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
+    return getAddrOfCXXStructor(GD, /*FnInfo=*/nullptr, /*FnType=*/nullptr,
                                 /*DontDefer=*/false, IsForDefinition);
   else if (isa<CXXMethodDecl>(D)) {
     auto FInfo = &getTypes().arrangeCXXMethodDeclaration(
         cast<CXXMethodDecl>(D));
     auto Ty = getTypes().GetFunctionType(*FInfo);
     return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
                              IsForDefinition);
   } else if (isa<FunctionDecl>(D)) {

clang/lib/CodeGen/CodeGenTypes.h

 
 namespace CodeGen {
 class ABIInfo;
 class CGCXXABI;
 class CGRecordLayout;
 class CodeGenModule;
 class RequiredArgs;
 
-enum class StructorType {
-  Complete, // constructor or destructor
-  Base,     // constructor or destructor
-  Deleting  // destructor only
-};
-
-inline CXXCtorType toCXXCtorType(StructorType T) {
-  switch (T) {
-  case StructorType::Complete:
-    return Ctor_Complete;
-  case StructorType::Base:
-    return Ctor_Base;
-  case StructorType::Deleting:
-    llvm_unreachable("cannot have a deleting ctor");
-  }
-  llvm_unreachable("not a StructorType");
-}
-
-inline StructorType getFromCtorType(CXXCtorType T) {
-  switch (T) {
-  case Ctor_Complete:
-    return StructorType::Complete;
-  case Ctor_Base:
-    return StructorType::Base;
-  case Ctor_Comdat:
-    llvm_unreachable("not expecting a COMDAT");
-  case Ctor_CopyingClosure:
-  case Ctor_DefaultClosure:
-    llvm_unreachable("not expecting a closure");
-  }
-  llvm_unreachable("not a CXXCtorType");
-}
-
-inline CXXDtorType toCXXDtorType(StructorType T) {
-  switch (T) {
-  case StructorType::Complete:
-    return Dtor_Complete;
-  case StructorType::Base:
-    return Dtor_Base;
-  case StructorType::Deleting:
-    return Dtor_Deleting;
-  }
-  llvm_unreachable("not a StructorType");
-}
-
-inline StructorType getFromDtorType(CXXDtorType T) {
-  switch (T) {
-  case Dtor_Deleting:
-    return StructorType::Deleting;
-  case Dtor_Complete:
-    return StructorType::Complete;
-  case Dtor_Base:
-    return StructorType::Base;
-  case Dtor_Comdat:
-    llvm_unreachable("not expecting a COMDAT");
-  }
-  llvm_unreachable("not a CXXDtorType");
-}
-
 /// This class organizes the cross-module state that is used while lowering
 /// AST types to LLVM types.
 class CodeGenTypes {
   CodeGenModule &CGM;
   // Some of this stuff should probably be left on the CGM.
   ASTContext &Context;
   llvm::Module &TheModule;
   const TargetInfo &Target;
public:
   const CGFunctionInfo &arrangeBlockFunctionDeclaration(
                                                  const FunctionProtoType *type,
                                                  const FunctionArgList &args);
   const CGFunctionInfo &arrangeBlockFunctionCall(const CallArgList &args,
                                                  const FunctionType *type);
 
   /// C++ methods have some special rules and also have implicit parameters.
   const CGFunctionInfo &arrangeCXXMethodDeclaration(const CXXMethodDecl *MD);
-  const CGFunctionInfo &arrangeCXXStructorDeclaration(const CXXMethodDecl *MD,
-                                                      StructorType Type);
+  const CGFunctionInfo &arrangeCXXStructorDeclaration(GlobalDecl GD);
   const CGFunctionInfo &arrangeCXXConstructorCall(const CallArgList &Args,
                                                   const CXXConstructorDecl *D,
                                                   CXXCtorType CtorKind,
                                                   unsigned ExtraPrefixArgs,
                                                   unsigned ExtraSuffixArgs,
                                                   bool PassProtoArgs = true);
 
   const CGFunctionInfo &arrangeCXXMethodCall(const CallArgList &args,

clang/lib/CodeGen/ItaniumCXXABI.cpp

public:
   llvm::Value *
     GetVirtualBaseClassOffset(CodeGenFunction &CGF, Address This,
                               const CXXRecordDecl *ClassDecl,
                               const CXXRecordDecl *BaseClassDecl) override;
 
   void EmitCXXConstructors(const CXXConstructorDecl *D) override;
 
   AddedStructorArgs
-  buildStructorSignature(const CXXMethodDecl *MD, StructorType T,
+  buildStructorSignature(GlobalDecl GD,
                          SmallVectorImpl<CanQualType> &ArgTys) override;
 
   bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor,
                               CXXDtorType DT) const override {
     // Itanium does not emit any destructor variant as an inline thunk.
     // Delegating may occur as an optimization, but all variants are either
     // emitted with external linkage or as linkonce if they are inline and used.
     return false;
public:
 
   /// Return the required visibility status for the given type and linkage in
   /// the current ABI.
   RTTIUniquenessKind
   classifyRTTIUniqueness(QualType CanTy,
                          llvm::GlobalValue::LinkageTypes Linkage) const;
   friend class ItaniumRTTIBuilder;
 
-  void emitCXXStructor(const CXXMethodDecl *MD, StructorType Type) override;
+  void emitCXXStructor(GlobalDecl GD) override;
 
   std::pair<llvm::Value *, const CXXRecordDecl *>
   LoadVTablePtr(CodeGenFunction &CGF, Address This,
                 const CXXRecordDecl *RD) override;
 
  private:
    bool hasAnyUnusedVirtualInlineFunction(const CXXRecordDecl *RD) const {
      const auto &VtableLayout =
void ItaniumCXXABI::emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) {
 
   // The address of the destructor.  If the exception type has a
   // trivial destructor (or isn't a record), we just pass null.
   llvm::Constant *Dtor = nullptr;
   if (const RecordType *RecordTy = ThrowType->getAs<RecordType>()) {
     CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordTy->getDecl());
     if (!Record->hasTrivialDestructor()) {
       CXXDestructorDecl *DtorD = Record->getDestructor();
-      Dtor = CGM.getAddrOfCXXStructor(DtorD, StructorType::Complete);
+      Dtor = CGM.getAddrOfCXXStructor(GlobalDecl(DtorD, Dtor_Complete));
       Dtor = llvm::ConstantExpr::getBitCast(Dtor, CGM.Int8PtrTy);
     }
   }
   if (!Dtor) Dtor = llvm::Constant::getNullValue(CGM.Int8PtrTy);
 
   llvm::Value *args[] = { ExceptionPtr, TypeInfo, Dtor };
   CGF.EmitNoreturnRuntimeCallOrInvoke(getThrowFn(CGM), args);
 }
void ItaniumCXXABI::EmitCXXConstructors(const CXXConstructorDecl *D) {
   // constructs the virtual bases, then calls the base constructor.
   if (!D->getParent()->isAbstract()) {
     // We don't need to emit the complete ctor if the class is abstract.
     CGM.EmitGlobal(GlobalDecl(D, Ctor_Complete));
   }
 }
 
 CGCXXABI::AddedStructorArgs
-ItaniumCXXABI::buildStructorSignature(const CXXMethodDecl *MD, StructorType T,
+ItaniumCXXABI::buildStructorSignature(GlobalDecl GD,
                                       SmallVectorImpl<CanQualType> &ArgTys) {
   ASTContext &Context = getContext();
 
   // All parameters are already in place except VTT, which goes after 'this'.
   // These are Clang types, so we don't need to worry about sret yet.
 
   // Check if we need to add a VTT parameter (which has type void **).
-  if (T == StructorType::Base && MD->getParent()->getNumVBases() != 0) {
+  if ((isa<CXXConstructorDecl>(GD.getDecl()) ? GD.getCtorType() == Ctor_Base
+                                             : GD.getDtorType() == Dtor_Base) &&
+      cast<CXXMethodDecl>(GD.getDecl())->getParent()->getNumVBases() != 0) {
     ArgTys.insert(ArgTys.begin() + 1,
                   Context.getPointerType(Context.VoidPtrTy));
     return AddedStructorArgs::prefix(1);
   }
   return AddedStructorArgs{};
 }
 
 void ItaniumCXXABI::EmitCXXDestructors(const CXXDestructorDecl *D) {
void ItaniumCXXABI::EmitDestructorCall(CodeGenFunction &CGF,
   llvm::Value *VTT = CGF.GetVTTParameter(GD, ForVirtualBase, Delegating);
   QualType VTTTy = getContext().getPointerType(getContext().VoidPtrTy);
 
   CGCallee Callee;
   if (getContext().getLangOpts().AppleKext &&
       Type != Dtor_Base && DD->isVirtual())
     Callee = CGF.BuildAppleKextVirtualDestructorCall(DD, Type, DD->getParent());
   else
-    Callee = CGCallee::forDirect(
-        CGM.getAddrOfCXXStructor(DD, getFromDtorType(Type)), GD);
+    Callee = CGCallee::forDirect(CGM.getAddrOfCXXStructor(GD), GD);
 
-  CGF.EmitCXXDestructorCall(DD, Callee, This.getPointer(), VTT, VTTTy, nullptr,
-                            getFromDtorType(Type));
+  CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(), VTT, VTTTy, nullptr);
 }
 
 void ItaniumCXXABI::emitVTableDefinitions(CodeGenVTables &CGVT,
                                           const CXXRecordDecl *RD) {
   llvm::GlobalVariable *VTable = getAddrOfVTable(RD, CharUnits());
   if (VTable->hasInitializer())
     return;
 

 }
 
 llvm::Value *ItaniumCXXABI::EmitVirtualDestructorCall(
     CodeGenFunction &CGF, const CXXDestructorDecl *Dtor, CXXDtorType DtorType,
     Address This, const CXXMemberCallExpr *CE) {
   assert(CE == nullptr || CE->arg_begin() == CE->arg_end());
   assert(DtorType == Dtor_Deleting || DtorType == Dtor_Complete);
 
-  const CGFunctionInfo *FInfo = &CGM.getTypes().arrangeCXXStructorDeclaration(
-      Dtor, getFromDtorType(DtorType));
+  GlobalDecl GD(Dtor, DtorType);
+  const CGFunctionInfo *FInfo =
+      &CGM.getTypes().arrangeCXXStructorDeclaration(GD);
   llvm::FunctionType *Ty = CGF.CGM.getTypes().GetFunctionType(*FInfo);
-  CGCallee Callee =
-      CGCallee::forVirtual(CE, GlobalDecl(Dtor, DtorType), This, Ty);
+  CGCallee Callee = CGCallee::forVirtual(CE, GD, This, Ty);
 
-  CGF.EmitCXXDestructorCall(Dtor, Callee, This.getPointer(), nullptr,
-                            QualType(), nullptr, getFromDtorType(DtorType));
+  CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(), nullptr, QualType(),
+                            nullptr);
   return nullptr;
 }
 
 void ItaniumCXXABI::emitVirtualInheritanceTables(const CXXRecordDecl *RD) {
   CodeGenVTables &VTables = CGM.getVTables();
   llvm::GlobalVariable *VTT = VTables.GetAddrOfVTT(RD);
   VTables.EmitVTTDefinition(VTT, CGM.getVTableLinkage(RD), RD);
 }
static void emitConstructorDestructorAlias(CodeGenModule &CGM,
   } else {
     Alias->setName(MangledName);
   }
 
   // Finally, set up the alias with its proper name and attributes.
   CGM.SetCommonAttributes(AliasDecl, Alias);
 }
 
-void ItaniumCXXABI::emitCXXStructor(const CXXMethodDecl *MD,
-                                    StructorType Type) {
+void ItaniumCXXABI::emitCXXStructor(GlobalDecl GD) {
+  auto *MD = cast<CXXMethodDecl>(GD.getDecl());
   auto *CD = dyn_cast<CXXConstructorDecl>(MD);
   const CXXDestructorDecl *DD = CD ? nullptr : cast<CXXDestructorDecl>(MD);
 
   StructorCodegen CGType = getCodegenToUse(CGM, MD);
 
-  if (Type == StructorType::Complete) {
-    GlobalDecl CompleteDecl;
+  if (CD ? GD.getCtorType() == Ctor_Complete
+         : GD.getDtorType() == Dtor_Complete) {
     GlobalDecl BaseDecl;
-    if (CD) {
-      CompleteDecl = GlobalDecl(CD, Ctor_Complete);
-      BaseDecl = GlobalDecl(CD, Ctor_Base);
-    } else {
-      CompleteDecl = GlobalDecl(DD, Dtor_Complete);
-      BaseDecl = GlobalDecl(DD, Dtor_Base);
-    }
+    if (CD)
+      BaseDecl = GD.getWithCtorType(Ctor_Base);
+    else
+      BaseDecl = GD.getWithDtorType(Dtor_Base);
 
     if (CGType == StructorCodegen::Alias || CGType == StructorCodegen::COMDAT) {
-      emitConstructorDestructorAlias(CGM, CompleteDecl, BaseDecl);
+      emitConstructorDestructorAlias(CGM, GD, BaseDecl);
       return;
     }
 
     if (CGType == StructorCodegen::RAUW) {
-      StringRef MangledName = CGM.getMangledName(CompleteDecl);
+      StringRef MangledName = CGM.getMangledName(GD);
       auto *Aliasee = CGM.GetAddrOfGlobal(BaseDecl);
       CGM.addReplacement(MangledName, Aliasee);
       return;
     }
   }
 
   // The base destructor is equivalent to the base destructor of its
   // base class if there is exactly one non-virtual base class with a
   // non-trivial destructor, there are no fields with a non-trivial
   // destructor, and the body of the destructor is trivial.
-  if (DD && Type == StructorType::Base && CGType != StructorCodegen::COMDAT &&
+  if (DD && GD.getDtorType() == Dtor_Base &&
+      CGType != StructorCodegen::COMDAT &&
       !CGM.TryEmitBaseDestructorAsAlias(DD))
     return;
 
   // FIXME: The deleting destructor is equivalent to the selected operator
   // delete if:
   //  * either the delete is a destroying operator delete or the destructor
   //    would be trivial if it weren't virtual,
   //  * the conversion from the 'this' parameter to the first parameter of the
   //    destructor is equivalent to a bitcast,
   //  * the destructor does not have an implicit "this" return, and
   //  * the operator delete has the same calling convention and IR function type
   //    as the destructor.
   // In such cases we should try to emit the deleting dtor as an alias to the
   // selected 'operator delete'.
 
-  llvm::Function *Fn = CGM.codegenCXXStructor(MD, Type);
+  llvm::Function *Fn = CGM.codegenCXXStructor(GD);
 
   if (CGType == StructorCodegen::COMDAT) {
     SmallString<256> Buffer;
     llvm::raw_svector_ostream Out(Buffer);
     if (DD)
       getMangleContext().mangleCXXDtorComdat(DD, Out);
     else
       getMangleContext().mangleCXXCtorComdat(CD, Out);

clang/lib/CodeGen/MicrosoftCXXABI.cpp

public:
   //
   // A TU defining a non-inline destructor is only guaranteed to emit a base
   // destructor, and all of the other variants are emitted on an as-needed basis
   // in COMDATs.  Because a non-base destructor can be emitted in a TU that
   // lacks a definition for the destructor, non-base destructors must always
   // delegate to or alias the base destructor.
 
   AddedStructorArgs
-  buildStructorSignature(const CXXMethodDecl *MD, StructorType T,
+  buildStructorSignature(GlobalDecl GD,
                          SmallVectorImpl<CanQualType> &ArgTys) override;
 
   /// Non-base dtors should be emitted as delegating thunks in this ABI.
   bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor,
                               CXXDtorType DT) const override {
     return DT != Dtor_Base;
   }
 
llvm::Constant *EmitMemberPointerConversion(
       CastExpr::path_const_iterator PathEnd, llvm::Constant *Src);
 
   CGCallee
   EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF, const Expr *E,
                                   Address This, llvm::Value *&ThisPtrForCall,
                                   llvm::Value *MemPtr,
                                   const MemberPointerType *MPT) override;
 
-  void emitCXXStructor(const CXXMethodDecl *MD, StructorType Type) override;
+  void emitCXXStructor(GlobalDecl GD) override;
 
   llvm::StructType *getCatchableTypeType() {
     if (CatchableTypeType)
       return CatchableTypeType;
     llvm::Type *FieldTypes[] = {
         CGM.IntTy,                           // Flags
         getImageRelativeType(CGM.Int8PtrTy), // TypeDescriptor
         CGM.IntTy,                           // NonVirtualAdjustment
llvm::Value *GVPtr =
         CGF.Builder.CreateConstInBoundsGEP2_32(GV->getValueType(), GV, 0, 0);
     VBPtr = CGF.Builder.CreateElementBitCast(VBPtr, GVPtr->getType(),
                                       "vbptr." + VBT->ObjectWithVPtr->getName());
     CGF.Builder.CreateStore(GVPtr, VBPtr);
   }
 }
 
 CGCXXABI::AddedStructorArgs
-MicrosoftCXXABI::buildStructorSignature(const CXXMethodDecl *MD, StructorType T,
+MicrosoftCXXABI::buildStructorSignature(GlobalDecl GD,
                                         SmallVectorImpl<CanQualType> &ArgTys) {
   AddedStructorArgs Added;
   // TODO: 'for base' flag
-  if (T == StructorType::Deleting) {
+  if (isa<CXXDestructorDecl>(GD.getDecl()) &&
+      GD.getDtorType() == Dtor_Deleting) {
     // The scalar deleting destructor takes an implicit int parameter.
     ArgTys.push_back(getContext().IntTy);
     ++Added.Suffix;
   }
-  auto *CD = dyn_cast<CXXConstructorDecl>(MD);
+  auto *CD = dyn_cast<CXXConstructorDecl>(GD.getDecl());
   if (!CD)
     return Added;
 
   // All parameters are already in place except is_most_derived, which goes
   // after 'this' if it's variadic and last if it's not.
 
   const CXXRecordDecl *Class = CD->getParent();
   const FunctionProtoType *FPT = CD->getType()->castAs<FunctionProtoType>();
void MicrosoftCXXABI::EmitDestructorCall(CodeGenFunction &CGF,
                                          CXXDtorType Type, bool ForVirtualBase,
                                          bool Delegating, Address This) {
   // Use the base destructor variant in place of the complete destructor variant
   // if the class has no virtual bases. This effectively implements some of the
   // -mconstructor-aliases optimization, but as part of the MS C++ ABI.
   if (Type == Dtor_Complete && DD->getParent()->getNumVBases() == 0)
     Type = Dtor_Base;
 
-  CGCallee Callee =
-      CGCallee::forDirect(CGM.getAddrOfCXXStructor(DD, getFromDtorType(Type)),
-                          GlobalDecl(DD, Type));
+  GlobalDecl GD(DD, Type);
+  CGCallee Callee = CGCallee::forDirect(CGM.getAddrOfCXXStructor(GD), GD);
 
   if (DD->isVirtual()) {
     assert(Type != CXXDtorType::Dtor_Deleting &&
            "The deleting destructor should only be called via a virtual call");
     This = adjustThisArgumentForVirtualFunctionCall(CGF, GlobalDecl(DD, Type),
                                                     This, false);
   }
 
   llvm::BasicBlock *BaseDtorEndBB = nullptr;
   if (ForVirtualBase && isa<CXXConstructorDecl>(CGF.CurCodeDecl)) {
     BaseDtorEndBB = EmitDtorCompleteObjectHandler(CGF);
   }
 
-  CGF.EmitCXXDestructorCall(DD, Callee, This.getPointer(),
+  CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(),
                             /*ImplicitParam=*/nullptr,
-                            /*ImplicitParamTy=*/QualType(), nullptr,
-                            getFromDtorType(Type));
+                            /*ImplicitParamTy=*/QualType(), nullptr);
   if (BaseDtorEndBB) {
     // Complete object handler should continue to be the remaining
     CGF.Builder.CreateBr(BaseDtorEndBB);
     CGF.EmitBlock(BaseDtorEndBB);
   }
 }
 
 void MicrosoftCXXABI::emitVTableTypeMetadata(const VPtrInfo &Info,
llvm::Value *MicrosoftCXXABI::EmitVirtualDestructorCall(
     CodeGenFunction &CGF, const CXXDestructorDecl *Dtor, CXXDtorType DtorType,
     Address This, const CXXMemberCallExpr *CE) {
   assert(CE == nullptr || CE->arg_begin() == CE->arg_end());
   assert(DtorType == Dtor_Deleting || DtorType == Dtor_Complete);
 
   // We have only one destructor in the vftable but can get both behaviors
   // by passing an implicit int parameter.
   GlobalDecl GD(Dtor, Dtor_Deleting);
-  const CGFunctionInfo *FInfo = &CGM.getTypes().arrangeCXXStructorDeclaration(
-      Dtor, StructorType::Deleting);
+  const CGFunctionInfo *FInfo =
+      &CGM.getTypes().arrangeCXXStructorDeclaration(GD);
   llvm::FunctionType *Ty = CGF.CGM.getTypes().GetFunctionType(*FInfo);
   CGCallee Callee = CGCallee::forVirtual(CE, GD, This, Ty);
 
   ASTContext &Context = getContext();
   llvm::Value *ImplicitParam = llvm::ConstantInt::get(
       llvm::IntegerType::getInt32Ty(CGF.getLLVMContext()),
       DtorType == Dtor_Deleting);
 
   This = adjustThisArgumentForVirtualFunctionCall(CGF, GD, This, true);
-  RValue RV =
-      CGF.EmitCXXDestructorCall(Dtor, Callee, This.getPointer(), ImplicitParam,
-                                Context.IntTy, CE, StructorType::Deleting);
+  RValue RV = CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(),
+                                        ImplicitParam, Context.IntTy, CE);
   return RV.getScalarVal();
 }
 
 const VBTableGlobals &
 MicrosoftCXXABI::enumerateVBTables(const CXXRecordDecl *RD) {
   // At this layer, we can key the cache off of a single class, which is much
   // easier than caching each vbtable individually.
   llvm::DenseMap<const CXXRecordDecl*, VBTableGlobals>::iterator Entry;

 
 /// Gets or a creates a Microsoft CompleteObjectLocator.
 llvm::GlobalVariable *
 MicrosoftCXXABI::getMSCompleteObjectLocator(const CXXRecordDecl *RD,
                                             const VPtrInfo &Info) {
   return MSRTTIBuilder(*this, RD).getCompleteObjectLocator(Info);
 }
 
-static void emitCXXConstructor(CodeGenModule &CGM,
-                               const CXXConstructorDecl *ctor,
-                               StructorType ctorType) {
+void MicrosoftCXXABI::emitCXXStructor(GlobalDecl GD) {
+  if (auto *ctor = dyn_cast<CXXConstructorDecl>(GD.getDecl())) {
     // There are no constructor variants, always emit the complete destructor.
-  llvm::Function *Fn = CGM.codegenCXXStructor(ctor, StructorType::Complete);
+    llvm::Function *Fn =
+        CGM.codegenCXXStructor(GD.getWithCtorType(Ctor_Complete));
     CGM.maybeSetTrivialComdat(*ctor, *Fn);
+    return;
   }
 
-static void emitCXXDestructor(CodeGenModule &CGM, const CXXDestructorDecl *dtor,
-                              StructorType dtorType) {
+  auto *dtor = cast<CXXDestructorDecl>(GD.getDecl());
+
   // Emit the base destructor if the base and complete (vbase) destructors are
   // equivalent. This effectively implements -mconstructor-aliases as part of
   // the ABI.
-  if (dtorType == StructorType::Complete &&
+  if (GD.getDtorType() == Dtor_Complete &&
       dtor->getParent()->getNumVBases() == 0)
-    dtorType = StructorType::Base;
+    GD = GD.getWithDtorType(Dtor_Base);
 
   // The base destructor is equivalent to the base destructor of its
   // base class if there is exactly one non-virtual base class with a
   // non-trivial destructor, there are no fields with a non-trivial
   // destructor, and the body of the destructor is trivial.
-  if (dtorType == StructorType::Base && !CGM.TryEmitBaseDestructorAsAlias(dtor))
+  if (GD.getDtorType() == Dtor_Base && !CGM.TryEmitBaseDestructorAsAlias(dtor))
     return;
 
-  llvm::Function *Fn = CGM.codegenCXXStructor(dtor, dtorType);
+  llvm::Function *Fn = CGM.codegenCXXStructor(GD);
   if (Fn->isWeakForLinker())
     Fn->setComdat(CGM.getModule().getOrInsertComdat(Fn->getName()));
 }
 
-void MicrosoftCXXABI::emitCXXStructor(const CXXMethodDecl *MD,
-                                      StructorType Type) {
-  if (auto *CD = dyn_cast<CXXConstructorDecl>(MD)) {
-    emitCXXConstructor(CGM, CD, Type);
-    return;
-  }
-  emitCXXDestructor(CGM, cast<CXXDestructorDecl>(MD), Type);
-}
-
 llvm::Function *
 MicrosoftCXXABI::getAddrOfCXXCtorClosure(const CXXConstructorDecl *CD,
                                          CXXCtorType CT) {
   assert(CT == Ctor_CopyingClosure || CT == Ctor_DefaultClosure);
 
   // Calculate the mangled name.
   SmallString<256> ThunkName;
   llvm::raw_svector_ostream Out(ThunkName);
MicrosoftCXXABI::getAddrOfCXXCtorClosure(const CXXConstructorDecl *CD,
 
   // Insert any ABI-specific implicit constructor arguments.
   AddedStructorArgs ExtraArgs =
       addImplicitConstructorArgs(CGF, CD, Ctor_Complete,
                                  /*ForVirtualBase=*/false,
                                  /*Delegating=*/false, Args);
   // Call the destructor with our arguments.
   llvm::Constant *CalleePtr =
-    CGM.getAddrOfCXXStructor(CD, StructorType::Complete);
+      CGM.getAddrOfCXXStructor(GlobalDecl(CD, Ctor_Complete));
   CGCallee Callee =
       CGCallee::forDirect(CalleePtr, GlobalDecl(CD, Ctor_Complete));
   const CGFunctionInfo &CalleeInfo = CGM.getTypes().arrangeCXXConstructorCall(
       Args, CD, Ctor_Complete, ExtraArgs.Prefix, ExtraArgs.Suffix);
   CGF.EmitCall(CalleeInfo, Callee, ReturnValueSlot(), Args);
 
   Cleanups.ForceCleanup();
 
llvm::Constant *MicrosoftCXXABI::getCatchableType(QualType T,
 
   // The runtime is responsible for calling the copy constructor if the
   // exception is caught by value.
   llvm::Constant *CopyCtor;
   if (CD) {
     if (CT == Ctor_CopyingClosure)
       CopyCtor = getAddrOfCXXCtorClosure(CD, Ctor_CopyingClosure);
     else
-      CopyCtor = CGM.getAddrOfCXXStructor(CD, StructorType::Complete);
+      CopyCtor = CGM.getAddrOfCXXStructor(GlobalDecl(CD, Ctor_Complete));
 
     CopyCtor = llvm::ConstantExpr::getBitCast(CopyCtor, CGM.Int8PtrTy);
   } else {
     CopyCtor = llvm::Constant::getNullValue(CGM.Int8PtrTy);
   }
   CopyCtor = getImageRelativeConstant(CopyCtor);
 
   bool IsScalar = !RD;
llvm::GlobalVariable *MicrosoftCXXABI::getThrowInfo(QualType T) {
 
   // The cleanup-function (a destructor) must be called when the exception
   // object's lifetime ends.
   llvm::Constant *CleanupFn = llvm::Constant::getNullValue(CGM.Int8PtrTy);
   if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
     if (CXXDestructorDecl *DtorD = RD->getDestructor())
       if (!DtorD->isTrivial())
         CleanupFn = llvm::ConstantExpr::getBitCast(
-            CGM.getAddrOfCXXStructor(DtorD, StructorType::Complete),
+            CGM.getAddrOfCXXStructor(GlobalDecl(DtorD, Dtor_Complete)),
             CGM.Int8PtrTy);
   // This is unused as far as we can tell, initialize it to null.
   llvm::Constant *ForwardCompat =
       getImageRelativeConstant(llvm::Constant::getNullValue(CGM.Int8PtrTy));
   llvm::Constant *PointerToCatchableTypes = getImageRelativeConstant(
       llvm::ConstantExpr::getBitCast(CTA, CGM.Int8PtrTy));
   llvm::StructType *TIType = getThrowInfoType();
   llvm::Constant *Fields[] = {