[CodeGen] Split CGDebugInfo into CGDebugInfo and CGDebugDwarf

[rnk]

Summary

The DWARF part contains all the logic for dealing with DITypes.

The split isn't very clean, there are a large number of places where
DISubprogram generation calls into type info generation. All of these
places currently have protected virtual methods to allow calling into
the dwarf specific code without changing it too heavily. Later these
call sites will be cleaned up to behave appropriately for CV and DWARF.

[rnk]

• Further minimize diff

[aprantl]

lib/CodeGen/CodeGenModule.h

292

This could be a separate useful NFC commit.

[echristo]

lib/CodeGen/CodeGenModule.h

292

And can you fix the formatting of the stuff above it while you're at "useful NFC commits"?

[rnk]

lib/CodeGen/CodeGenModule.h

292

r266263

[rnk]

• Rebase over unique_ptr change

[rnk]

ping

[aprantl]

lib/CodeGen/CGDebugInfo.h

97

Why does this need to be virtual?

298

As you said, this isn't very clean. Can you outline how this can be improved later? Will CodeView still need some form of DISubroutineTypes?

348

Should this be part of CGDebugInfoDwarf?

350

1. Why does retainType need to be virtual?
2. I assume that the list of retained types is meaningless for CodeView? Could this be moved to CGDebugInfoDwarf instead?

354–356

redundant private.

[rnk]

lib/CodeGen/CGDebugInfo.h

97

I guess it adjusts the CU, which is shared. OK, I'll move it back to CGDebugInfo. It just felt fairly dwarf-specific.

298

I think the parameters are right for CodeView and DWARF, but the return type will have to be DITypeRef so that I can get a DITypeIndex out of here. My next patch changes this and a few other return types.

348

The implementation directly uses DIBuilder to make a DICompositeType. If we wanted to make this logic common, we would have to first build a synthetic clang AST RecordDecl and then send that through getOrCreateType.

350

1. Yes, I intend to keep retainType as a no-op for CodeView. If a type makes it to the stream, it's up to the linker to decide whether it keeps it or not.
2. Are you asking if I can sink all the callers of this method down into CGDebugDwarf? Possibly, but EmitGlobalVariable directly references it, and I would expect that to be part of CGDebugInfo. We could come up with a different level of indirection, such as getOrCreateGlobalVariableType, similar to getOrCreateFunctionType and sink that logic to DWARF.

[rnk]

• Rebase, move setDwoId back to CGDebugInfo

[echristo]

As a note I'm going to want to review this before it goes in.

[echristo]

This appears to be a different direction from what we'd agreed upon. Please
update the original thread with discussion and your intentions and a
breakdown of costs, long-term maintainability, and your plans here.

Thanks.

lib/CodeGen/CGDebugDwarf.h

-//===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===//
+//===--- CGDebugDwarf.h - DebugInfo for LLVM CodeGen ------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This is the source-level debug info generator for llvm translation.
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
-#define LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
+#ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGDWARF_H
+#define LLVM_CLANG_LIB_CODEGEN_CGDEBUGDWARF_H
 
+#include "CGDebugDwarf.h"
 #include "CGBuilder.h"
+#include "CGDebugInfo.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Frontend/CodeGenOptions.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/IR/DIBuilder.h"

 namespace CodeGen {
 class CodeGenModule;
 class CodeGenFunction;
 class CGBlockInfo;
 
 /// This class gathers all debug information during compilation and is
 /// responsible for emitting to llvm globals or pass directly to the
 /// backend.
-class CGDebugInfo {
-  friend class ApplyDebugLocation;
-  friend class SaveAndRestoreLocation;
-  CodeGenModule &CGM;
-  const codegenoptions::DebugInfoKind DebugKind;
+class CGDebugDwarf final : public CGDebugInfo {
   bool DebugTypeExtRefs;
-  llvm::DIBuilder DBuilder;
-  llvm::DICompileUnit *TheCU = nullptr;
-  ModuleMap *ClangModuleMap = nullptr;
-  ExternalASTSource::ASTSourceDescriptor PCHDescriptor;
-  SourceLocation CurLoc;
   llvm::DIType *VTablePtrType = nullptr;
   llvm::DIType *ClassTy = nullptr;
   llvm::DICompositeType *ObjTy = nullptr;
   llvm::DIType *SelTy = nullptr;
 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
   llvm::DIType *SingletonId = nullptr;
 #include "clang/AST/OpenCLImageTypes.def"
   llvm::DIType *OCLEventDITy = nullptr;
   llvm::DIType *OCLClkEventDITy = nullptr;
   llvm::DIType *OCLQueueDITy = nullptr;
   llvm::DIType *OCLNDRangeDITy = nullptr;
   llvm::DIType *OCLReserveIDDITy = nullptr;
 
   /// Cache of previously constructed Types.
   llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
 
-  llvm::SmallDenseMap<llvm::StringRef, llvm::StringRef> DebugPrefixMap;
+  /// List of interfaces we want to keep even if orphaned.
+  std::vector<void *> RetainedTypes;
+
+  /// Cache of forward declared types to RAUW at the end of
+  /// compilation.
+  std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
 
   struct ObjCInterfaceCacheEntry {
     const ObjCInterfaceType *Type;
     llvm::DIType *Decl;
     llvm::DIFile *Unit;
     ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl,
                             llvm::DIFile *Unit)
         : Type(Type), Decl(Decl), Unit(Unit) {}
   };
 
   /// Cache of previously constructed interfaces which may change.
   llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
 
   /// Cache of references to clang modules and precompiled headers.
   llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache;
 
-  /// List of interfaces we want to keep even if orphaned.
-  std::vector<void *> RetainedTypes;
-
-  /// Cache of forward declared types to RAUW at the end of
-  /// compilation.
-  std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
-
-  /// Cache of replaceable forward declarations (functions and
-  /// variables) to RAUW at the end of compilation.
-  std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
-      FwdDeclReplaceMap;
-
-  /// Keep track of our current nested lexical block.
-  std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
-  llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
-  /// Keep track of LexicalBlockStack counter at the beginning of a
-  /// function. This is used to pop unbalanced regions at the end of a
-  /// function.
-  std::vector<unsigned> FnBeginRegionCount;
-
-  /// This is a storage for names that are constructed on demand. For
-  /// example, C++ destructors, C++ operators etc..
-  llvm::BumpPtrAllocator DebugInfoNames;
-  StringRef CWDName;
-
-  llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
-  llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
   /// Cache declarations relevant to DW_TAG_imported_declarations (C++
   /// using declarations) that aren't covered by other more specific caches.
-  llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
   llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NameSpaceCache;
   llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
       NamespaceAliasCache;
   llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>>
       StaticDataMemberCache;
 
   /// Helper functions for getOrCreateType.
   /// @{
#include "clang/AST/OpenCLImageTypes.def"
   llvm::DIType *CreateEnumType(const EnumType *Ty);
   llvm::DIType *CreateTypeDefinition(const EnumType *Ty);
   /// Look up the completed type for a self pointer in the TypeCache and
   /// create a copy of it with the ObjectPointer and Artificial flags
   /// set. If the type is not cached, a new one is created. This should
   /// never happen though, since creating a type for the implicit self
   /// argument implies that we already parsed the interface definition
   /// and the ivar declarations in the implementation.
-  llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty);
+  llvm::DIType *CreateSelfType(const QualType &QualTy,
+                               llvm::DIType *Ty) override;
   /// @}
 
   /// Get the type from the cache or return null type if it doesn't
   /// exist.
   llvm::DIType *getTypeOrNull(const QualType);
   /// Return the debug type for a C++ method.
   /// \arg CXXMethodDecl is of FunctionType. This function type is
   /// not updated to include implicit \c this pointer. Use this routine
   /// to get a method type which includes \c this pointer.
   llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
                                                 llvm::DIFile *F);
   llvm::DISubroutineType *
   getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
                                 llvm::DIFile *Unit);
-  llvm::DISubroutineType *
-  getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F);
+
+  llvm::DISubroutineType *getOrCreateFunctionType(const Decl *D,
+                                                  QualType FnType,
+                                                  llvm::DIFile *F) override;
+
   /// \return debug info descriptor for vtable.
   llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F);
-  /// \return namespace descriptor for the given namespace decl.
-  llvm::DINamespace *getOrCreateNameSpace(const NamespaceDecl *N);
   llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty,
                                       QualType PointeeTy, llvm::DIFile *F);
   llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache);
 
   /// A helper function to create a subprogram for a single member
   /// function GlobalDecl.
   llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method,
                                               llvm::DIFile *F,
-                                              llvm::DIType *RecordTy);
+                                              llvm::DIType *RecordTy) override;
 
   /// A helper function to collect debug info for C++ member
   /// functions. This is used while creating debug info entry for a
   /// Record.
   void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F,
                                  SmallVectorImpl<llvm::Metadata *> &E,
                                  llvm::DIType *T);
 
   /// A helper function to collect debug info for C++ base
   /// classes. This is used while creating debug info entry for a
   /// Record.
   void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F,
                        SmallVectorImpl<llvm::Metadata *> &EltTys,
                        llvm::DIType *RecordTy);
 
   /// A helper function to collect template parameters.
   llvm::DINodeArray CollectTemplateParams(const TemplateParameterList *TPList,
                                           ArrayRef<TemplateArgument> TAList,
                                           llvm::DIFile *Unit);
+
   /// A helper function to collect debug info for function template
   /// parameters.
   llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD,
-                                                  llvm::DIFile *Unit);
+                                                  llvm::DIFile *Unit) override;
 
   /// A helper function to collect debug info for template
   /// parameters.
   llvm::DINodeArray
   CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
                            llvm::DIFile *F);
 
   llvm::DIType *createFieldType(StringRef name, QualType type,
void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F,
                            llvm::DICompositeType *RecordTy);
 
   /// If the C++ class has vtable info then insert appropriate debug
   /// info entry in EltTys vector.
   void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F,
                          SmallVectorImpl<llvm::Metadata *> &EltTys);
   /// @}
 
-  /// Create a new lexical block node and push it on the stack.
-  void CreateLexicalBlock(SourceLocation Loc);
-
 public:
-  CGDebugInfo(CodeGenModule &CGM);
-  ~CGDebugInfo();
+  CGDebugDwarf(CodeGenModule &CGM);
+  ~CGDebugDwarf() override;
 
-  void finalize();
+  void finalize() override;
 
-  /// Module debugging: Support for building PCMs.
-  /// @{
   /// Set the main CU's DwoId field to \p Signature.
-  void setDwoId(uint64_t Signature);
+  void setDwoId(uint64_t Signature) override;
 
-  /// When generating debug information for a clang module or
-  /// precompiled header, this module map will be used to determine
-  /// the module of origin of each Decl.
-  void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; }
-
-  /// When generating debug information for a clang module or
-  /// precompiled header, this module map will be used to determine
-  /// the module of origin of each Decl.
-  void setPCHDescriptor(ExternalASTSource::ASTSourceDescriptor PCH) {
-    PCHDescriptor = PCH;
+  /// Ensure that the type representing the passed in opaque Decl is retained
+  /// even if it is otherwise unreferenced.
+  void retainType(void *OpaqueDecl) override {
+    RetainedTypes.push_back(OpaqueDecl);
   }
-  /// @}
-
-  /// Update the current source location. If \arg loc is invalid it is
-  /// ignored.
-  void setLocation(SourceLocation Loc);
-
-  /// Emit metadata to indicate a change in line/column information in
-  /// the source file. If the location is invalid, the previous
-  /// location will be reused.
-  void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);
-
-  /// Emit a call to llvm.dbg.function.start to indicate
-  /// start of a new function.
-  /// \param Loc       The location of the function header.
-  /// \param ScopeLoc  The location of the function body.
-  void EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
-                         SourceLocation ScopeLoc, QualType FnType,
-                         llvm::Function *Fn, CGBuilderTy &Builder);
-
-  /// Emit debug info for a function declaration.
-  void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, QualType FnType);
-
-  /// Constructs the debug code for exiting a function.
-  void EmitFunctionEnd(CGBuilderTy &Builder);
-
-  /// Emit metadata to indicate the beginning of a new lexical block
-  /// and push the block onto the stack.
-  void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
-
-  /// Emit metadata to indicate the end of a new lexical block and pop
-  /// the current block.
-  void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
-
-  /// Emit call to \c llvm.dbg.declare for an automatic variable
-  /// declaration.
-  void EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
-                                 CGBuilderTy &Builder);
-
-  /// Emit call to \c llvm.dbg.declare for an imported variable
-  /// declaration in a block.
-  void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
-                                         llvm::Value *storage,
-                                         CGBuilderTy &Builder,
-                                         const CGBlockInfo &blockInfo,
-                                         llvm::Instruction *InsertPoint = nullptr);
-
-  /// Emit call to \c llvm.dbg.declare for an argument variable
-  /// declaration.
-  void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
-                                unsigned ArgNo, CGBuilderTy &Builder);
 
   /// Emit call to \c llvm.dbg.declare for the block-literal argument
   /// to a block invocation function.
   void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
                                             llvm::Value *Arg, unsigned ArgNo,
                                             llvm::Value *LocalAddr,
-                                            CGBuilderTy &Builder);
-
-  /// Emit information about a global variable.
-  void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
-
-  /// Emit global variable's debug info.
-  void EmitGlobalVariable(const ValueDecl *VD, llvm::Constant *Init);
+                                            CGBuilderTy &Builder) override;
 
   /// Emit C++ using directive.
-  void EmitUsingDirective(const UsingDirectiveDecl &UD);
+  void EmitUsingDirective(const UsingDirectiveDecl &UD) override;
 
   /// Emit the type explicitly casted to.
-  void EmitExplicitCastType(QualType Ty);
+  void EmitExplicitCastType(QualType Ty) override;
 
   /// Emit C++ using declaration.
-  void EmitUsingDecl(const UsingDecl &UD);
+  void EmitUsingDecl(const UsingDecl &UD) override;
 
   /// Emit an @import declaration.
-  void EmitImportDecl(const ImportDecl &ID);
+  void EmitImportDecl(const ImportDecl &ID) override;
 
   /// Emit C++ namespace alias.
-  llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA);
+  llvm::DIImportedEntity *
+  EmitNamespaceAlias(const NamespaceAliasDecl &NA) override;
 
   /// Emit record type's standalone debug info.
-  llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L);
+  llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L) override;
 
   /// Emit an Objective-C interface type standalone debug info.
-  llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);
+  llvm::DIType *getOrCreateInterfaceType(QualType Ty,
+                                         SourceLocation Loc) override;
 
   /// Emit standalone debug info for a type.
-  llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc);
+  llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc) override;
 
-  void completeType(const EnumDecl *ED);
-  void completeType(const RecordDecl *RD);
-  void completeRequiredType(const RecordDecl *RD);
-  void completeClassData(const RecordDecl *RD);
+  void completeType(const EnumDecl *ED) override;
+  void completeType(const RecordDecl *RD) override;
+  void completeRequiredType(const RecordDecl *RD) override;
+  void completeClassData(const RecordDecl *RD) override;
 
-  void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
+  void completeTemplateDefinition(
+      const ClassTemplateSpecializationDecl &SD) override;
 
 private:
-  /// Emit call to llvm.dbg.declare for a variable declaration.
-  void EmitDeclare(const VarDecl *decl, llvm::Value *AI,
-                   llvm::Optional<unsigned> ArgNo, CGBuilderTy &Builder);
-
   /// Build up structure info for the byref.  See \a BuildByRefType.
   llvm::DIType *EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
-                                             uint64_t *OffSet);
-
-  /// Get context info for the DeclContext of \p Decl.
-  llvm::DIScope *getDeclContextDescriptor(const Decl *D);
-  /// Get context info for a given DeclContext \p Decl.
-  llvm::DIScope *getContextDescriptor(const Decl *Context,
-                                      llvm::DIScope *Default);
-
-  llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);
-
-  /// Create a forward decl for a RecordType in a given context.
-  llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
-                                                  llvm::DIScope *);
-
-  /// Return current directory name.
-  StringRef getCurrentDirname();
-
-  /// Create new compile unit.
-  void CreateCompileUnit();
-
-  /// Remap a given path with the current debug prefix map
-  std::string remapDIPath(StringRef) const;
-
-  /// Get the file debug info descriptor for the input location.
-  llvm::DIFile *getOrCreateFile(SourceLocation Loc);
-
-  /// Get the file info for main compile unit.
-  llvm::DIFile *getOrCreateMainFile();
-
-  /// Get the type from the cache or create a new type if necessary.
-  llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg);
+                                             uint64_t *OffSet) override;
 
   /// Get a reference to a clang module.  If \p CreateSkeletonCU is true,
   /// this also creates a split dwarf skeleton compile unit.
   llvm::DIModule *
   getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
                        bool CreateSkeletonCU);
 
+  /// \return namespace descriptor for the given namespace decl.
+  llvm::DINamespace *getOrCreateNameSpace(const NamespaceDecl *N) override;
+
   /// DebugTypeExtRefs: If \p D originated in a clang module, return it.
-  llvm::DIModule *getParentModuleOrNull(const Decl *D);
+  llvm::DIModule *getParentModuleOrNull(const Decl *D) override;
+
+  /// Get the type from the cache or create a new type if necessary.
+  llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg) override;
+
+  /// Create a forward decl for a RecordType in a given context.
+  llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
+                                                  llvm::DIScope *);
 
   /// Get the type from the cache or create a new partial type if
   /// necessary.
   llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty,
                                                 llvm::DIFile *F);
 
   /// Create type metadata for a source language type.
   llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg);
 
   /// Create new member and increase Offset by FType's size.
   llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType,
                                  StringRef Name, uint64_t *Offset);
 
-  /// Retrieve the DIDescriptor, if any, for the canonical form of this
-  /// declaration.
-  llvm::DINode *getDeclarationOrDefinition(const Decl *D);
-
-  /// \return debug info descriptor to describe method
-  /// declaration for the given method definition.
-  llvm::DISubprogram *getFunctionDeclaration(const Decl *D);
-
   /// \return debug info descriptor to describe in-class static data
   /// member declaration for the given out-of-class definition.  If D
   /// is an out-of-class definition of a static data member of a
   /// class, find its corresponding in-class declaration.
   llvm::DIDerivedType *
-  getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
-
-  /// Create a subprogram describing the forward declaration
-  /// represented in the given FunctionDecl.
-  llvm::DISubprogram *getFunctionForwardDeclaration(const FunctionDecl *FD);
+  getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) override;
 
   /// Create a global variable describing the forward decalration
   /// represented in the given VarDecl.
   llvm::DIGlobalVariable *
   getGlobalVariableForwardDeclaration(const VarDecl *VD);
 
   /// \brief Return a global variable that represents one of the
   /// collection of global variables created for an anonmyous union.
   ///
   /// Recursively collect all of the member fields of a global
   /// anonymous decl and create static variables for them. The first
   /// time this is called it needs to be on a union and then from
   /// there we can have additional unnamed fields.
   llvm::DIGlobalVariable *
   CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
                          unsigned LineNo, StringRef LinkageName,
-                         llvm::GlobalVariable *Var, llvm::DIScope *DContext);
-
-  /// Get function name for the given FunctionDecl. If the name is
-  /// constructed on demand (e.g., C++ destructor) then the name is
-  /// stored on the side.
-  StringRef getFunctionName(const FunctionDecl *FD);
-
-  /// Returns the unmangled name of an Objective-C method.
-  /// This is the display name for the debugging info.
-  StringRef getObjCMethodName(const ObjCMethodDecl *FD);
-
-  /// Return selector name. This is used for debugging
-  /// info.
-  StringRef getSelectorName(Selector S);
-
-  /// Get class name including template argument list.
-  StringRef getClassName(const RecordDecl *RD);
-
-  /// Get the vtable name for the given class.
-  StringRef getVTableName(const CXXRecordDecl *Decl);
-
-  /// Get line number for the location. If location is invalid
-  /// then use current location.
-  unsigned getLineNumber(SourceLocation Loc);
-
-  /// Get column number for the location. If location is
-  /// invalid then use current location.
-  /// \param Force  Assume DebugColumnInfo option is true.
-  unsigned getColumnNumber(SourceLocation Loc, bool Force = false);
-
-  /// Collect various properties of a FunctionDecl.
-  /// \param GD  A GlobalDecl whose getDecl() must return a FunctionDecl.
-  void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
-                                StringRef &Name, StringRef &LinkageName,
-                                llvm::DIScope *&FDContext,
-                                llvm::DINodeArray &TParamsArray,
-                                unsigned &Flags);
-
-  /// Collect various properties of a VarDecl.
-  void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
-                           unsigned &LineNo, QualType &T, StringRef &Name,
-                           StringRef &LinkageName, llvm::DIScope *&VDContext);
-
-  /// Allocate a copy of \p A using the DebugInfoNames allocator
-  /// and return a reference to it. If multiple arguments are given the strings
-  /// are concatenated.
-  StringRef internString(StringRef A, StringRef B = StringRef()) {
-    char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
-    if (!A.empty())
-      std::memcpy(Data, A.data(), A.size());
-    if (!B.empty())
-      std::memcpy(Data + A.size(), B.data(), B.size());
-    return StringRef(Data, A.size() + B.size());
-  }
-};
-
-/// A scoped helper to set the current debug location to the specified
-/// location or preferred location of the specified Expr.
-class ApplyDebugLocation {
-private:
-  void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false);
-  ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty,
-                     SourceLocation TemporaryLocation);
-
-  llvm::DebugLoc OriginalLocation;
-  CodeGenFunction *CGF;
-
-public:
-  /// Set the location to the (valid) TemporaryLocation.
-  ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation);
-  ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
-  ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
-  ApplyDebugLocation(ApplyDebugLocation &&Other) : CGF(Other.CGF) {
-    Other.CGF = nullptr;
-  }
-
-  ~ApplyDebugLocation();
-
-  /// \brief Apply TemporaryLocation if it is valid. Otherwise switch
-  /// to an artificial debug location that has a valid scope, but no
-  /// line information.
-  ///
-  /// Artificial locations are useful when emitting compiler-generated
-  /// helper functions that have no source location associated with
-  /// them. The DWARF specification allows the compiler to use the
-  /// special line number 0 to indicate code that can not be
-  /// attributed to any source location. Note that passing an empty
-  /// SourceLocation to CGDebugInfo::setLocation() will result in the
-  /// last valid location being reused.
-  static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF) {
-    return ApplyDebugLocation(CGF, false, SourceLocation());
-  }
-  /// \brief Apply TemporaryLocation if it is valid. Otherwise switch
-  /// to an artificial debug location that has a valid scope, but no
-  /// line information.
-  static ApplyDebugLocation
-  CreateDefaultArtificial(CodeGenFunction &CGF,
-                          SourceLocation TemporaryLocation) {
-    return ApplyDebugLocation(CGF, false, TemporaryLocation);
-  }
-
-  /// Set the IRBuilder to not attach debug locations.  Note that
-  /// passing an empty SourceLocation to \a CGDebugInfo::setLocation()
-  /// will result in the last valid location being reused.  Note that
-  /// all instructions that do not have a location at the beginning of
-  /// a function are counted towards to function prologue.
-  static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF) {
-    return ApplyDebugLocation(CGF, true, SourceLocation());
-  }
-
+                         llvm::GlobalVariable *Var,
+                         llvm::DIScope *DContext) override;
 };
 
 } // namespace CodeGen
 } // namespace clang
 
-#endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
+#endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGDWARF_H

lib/CodeGen/CGDebugDwarf.cpp

-//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
+//===--- CGDebugDwarf.cpp - Emit Debug Information for a Module -----------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This coordinates the debug information generation while generating code.
 //
 //===----------------------------------------------------------------------===//
 
-#include "CGDebugInfo.h"
+#include "CGDebugDwarf.h"
 #include "CGBlocks.h"
 #include "CGCXXABI.h"
 #include "CGObjCRuntime.h"
 #include "CodeGenFunction.h"
 #include "CodeGenModule.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclFriend.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/SourceManager.h"
-#include "clang/Basic/Version.h"
 #include "clang/Frontend/CodeGenOptions.h"
 #include "clang/Lex/HeaderSearchOptions.h"
 #include "clang/Lex/ModuleMap.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/IR/Constants.h"
+#include "llvm/IR/DIBuilder.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
+
 using namespace clang;
 using namespace clang::CodeGen;
 
-CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
-    : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
-      DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
-      DBuilder(CGM.getModule()) {
-  for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
-    DebugPrefixMap[KV.first] = KV.second;
-  CreateCompileUnit();
-}
-
-CGDebugInfo::~CGDebugInfo() {
-  assert(LexicalBlockStack.empty() &&
-         "Region stack mismatch, stack not empty!");
-}
-
-ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
-                                       SourceLocation TemporaryLocation)
-    : CGF(&CGF) {
-  init(TemporaryLocation);
-}
-
-ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
-                                       bool DefaultToEmpty,
-                                       SourceLocation TemporaryLocation)
-    : CGF(&CGF) {
-  init(TemporaryLocation, DefaultToEmpty);
-}
-
-void ApplyDebugLocation::init(SourceLocation TemporaryLocation,
-                              bool DefaultToEmpty) {
-  auto *DI = CGF->getDebugInfo();
-  if (!DI) {
-    CGF = nullptr;
-    return;
-  }
-
-  OriginalLocation = CGF->Builder.getCurrentDebugLocation();
-  if (TemporaryLocation.isValid()) {
-    DI->EmitLocation(CGF->Builder, TemporaryLocation);
-    return;
-  }
-
-  if (DefaultToEmpty) {
-    CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc());
-    return;
-  }
-
-  // Construct a location that has a valid scope, but no line info.
-  assert(!DI->LexicalBlockStack.empty());
-  CGF->Builder.SetCurrentDebugLocation(
-      llvm::DebugLoc::get(0, 0, DI->LexicalBlockStack.back()));
-}
-
-ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
-    : CGF(&CGF) {
-  init(E->getExprLoc());
-}
-
-ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
-    : CGF(&CGF) {
-  if (!CGF.getDebugInfo()) {
-    this->CGF = nullptr;
-    return;
-  }
-  OriginalLocation = CGF.Builder.getCurrentDebugLocation();
-  if (Loc)
-    CGF.Builder.SetCurrentDebugLocation(std::move(Loc));
-}
-
-ApplyDebugLocation::~ApplyDebugLocation() {
-  // Query CGF so the location isn't overwritten when location updates are
-  // temporarily disabled (for C++ default function arguments)
-  if (CGF)
-    CGF->Builder.SetCurrentDebugLocation(std::move(OriginalLocation));
-}
-
-void CGDebugInfo::setLocation(SourceLocation Loc) {
-  // If the new location isn't valid return.
-  if (Loc.isInvalid())
-    return;
-
-  CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
-
-  // If we've changed files in the middle of a lexical scope go ahead
-  // and create a new lexical scope with file node if it's different
-  // from the one in the scope.
-  if (LexicalBlockStack.empty())
-    return;
-
-  SourceManager &SM = CGM.getContext().getSourceManager();
-  auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
-  PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
-
-  if (PCLoc.isInvalid() || Scope->getFilename() == PCLoc.getFilename())
-    return;
-
-  if (auto *LBF = dyn_cast<llvm::DILexicalBlockFile>(Scope)) {
-    LexicalBlockStack.pop_back();
-    LexicalBlockStack.emplace_back(DBuilder.createLexicalBlockFile(
-        LBF->getScope(), getOrCreateFile(CurLoc)));
-  } else if (isa<llvm::DILexicalBlock>(Scope) ||
-             isa<llvm::DISubprogram>(Scope)) {
-    LexicalBlockStack.pop_back();
-    LexicalBlockStack.emplace_back(
-        DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc)));
-  }
-}
-
-llvm::DIScope *CGDebugInfo::getDeclContextDescriptor(const Decl *D) {
-  llvm::DIScope *Mod = getParentModuleOrNull(D);
-  return getContextDescriptor(cast<Decl>(D->getDeclContext()),
-                              Mod ? Mod : TheCU);
-}
-
-llvm::DIScope *CGDebugInfo::getContextDescriptor(const Decl *Context,
-                                                 llvm::DIScope *Default) {
-  if (!Context)
-    return Default;
-
-  auto I = RegionMap.find(Context);
-  if (I != RegionMap.end()) {
-    llvm::Metadata *V = I->second;
-    return dyn_cast_or_null<llvm::DIScope>(V);
-  }
-
-  // Check namespace.
-  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
-    return getOrCreateNameSpace(NSDecl);
-
-  if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context))
-    if (!RDecl->isDependentType())
-      return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
-                             getOrCreateMainFile());
-  return Default;
-}
-
-StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
-  assert(FD && "Invalid FunctionDecl!");
-  IdentifierInfo *FII = FD->getIdentifier();
-  FunctionTemplateSpecializationInfo *Info =
-      FD->getTemplateSpecializationInfo();
-
-  if (!Info && FII && !CGM.getCodeGenOpts().EmitCodeView)
-    return FII->getName();
-
-  // Otherwise construct human readable name for debug info.
-  SmallString<128> NS;
-  llvm::raw_svector_ostream OS(NS);
-  PrintingPolicy Policy(CGM.getLangOpts());
-
-  if (CGM.getCodeGenOpts().EmitCodeView) {
-    // Print a fully qualified name like MSVC would.
-    Policy.MSVCFormatting = true;
-    FD->printQualifiedName(OS, Policy);
-  } else {
-    // Print the unqualified name with some template arguments. This is what
-    // DWARF-based debuggers expect.
-    FD->printName(OS);
-    // Add any template specialization args.
-    if (Info) {
-      const TemplateArgumentList *TArgs = Info->TemplateArguments;
-      const TemplateArgument *Args = TArgs->data();
-      unsigned NumArgs = TArgs->size();
-      TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
-                                                            Policy);
-    }
-  }
-
-  // Copy this name on the side and use its reference.
-  return internString(OS.str());
-}
-
-StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
-  SmallString<256> MethodName;
-  llvm::raw_svector_ostream OS(MethodName);
-  OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
-  const DeclContext *DC = OMD->getDeclContext();
-  if (const ObjCImplementationDecl *OID =
-          dyn_cast<const ObjCImplementationDecl>(DC)) {
-    OS << OID->getName();
-  } else if (const ObjCInterfaceDecl *OID =
-                 dyn_cast<const ObjCInterfaceDecl>(DC)) {
-    OS << OID->getName();
-  } else if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(DC)) {
-    if (OC->IsClassExtension()) {
-      OS << OC->getClassInterface()->getName();
-    } else {
-      OS << ((const NamedDecl *)OC)->getIdentifier()->getNameStart() << '('
-         << OC->getIdentifier()->getNameStart() << ')';
-    }
-  } else if (const ObjCCategoryImplDecl *OCD =
-                 dyn_cast<const ObjCCategoryImplDecl>(DC)) {
-    OS << ((const NamedDecl *)OCD)->getIdentifier()->getNameStart() << '('
-       << OCD->getIdentifier()->getNameStart() << ')';
-  } else if (isa<ObjCProtocolDecl>(DC)) {
-    // We can extract the type of the class from the self pointer.
-    if (ImplicitParamDecl *SelfDecl = OMD->getSelfDecl()) {
-      QualType ClassTy =
-          cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
-      ClassTy.print(OS, PrintingPolicy(LangOptions()));
-    }
-  }
-  OS << ' ' << OMD->getSelector().getAsString() << ']';
-
-  return internString(OS.str());
-}
-
-StringRef CGDebugInfo::getSelectorName(Selector S) {
-  return internString(S.getAsString());
-}
-
-StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
-  // quick optimization to avoid having to intern strings that are already
-  // stored reliably elsewhere
-  if (!isa<ClassTemplateSpecializationDecl>(RD))
-    return RD->getName();
-
-  SmallString<128> Name;
-  {
-    llvm::raw_svector_ostream OS(Name);
-    RD->getNameForDiagnostic(OS, CGM.getContext().getPrintingPolicy(),
-                             /*Qualified*/ false);
-  }
-
-  // Copy this name on the side and use its reference.
-  return internString(Name);
-}
-
-llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
-  if (!Loc.isValid())
-    // If Location is not valid then use main input file.
-    return DBuilder.createFile(remapDIPath(TheCU->getFilename()),
-                               remapDIPath(TheCU->getDirectory()));
-
-  SourceManager &SM = CGM.getContext().getSourceManager();
-  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
-
-  if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
-    // If the location is not valid then use main input file.
-    return DBuilder.createFile(remapDIPath(TheCU->getFilename()),
-                               remapDIPath(TheCU->getDirectory()));
-
-  // Cache the results.
-  const char *fname = PLoc.getFilename();
-  auto it = DIFileCache.find(fname);
-
-  if (it != DIFileCache.end()) {
-    // Verify that the information still exists.
-    if (llvm::Metadata *V = it->second)
-      return cast<llvm::DIFile>(V);
-  }
+CGDebugDwarf::CGDebugDwarf(CodeGenModule &CGM)
+    : CGDebugInfo(CGM),
+      DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs) {}
 
-  llvm::DIFile *F = DBuilder.createFile(remapDIPath(PLoc.getFilename()),
-                                        remapDIPath(getCurrentDirname()));
+CGDebugDwarf::~CGDebugDwarf() {}
 
-  DIFileCache[fname].reset(F);
-  return F;
-}
-
-llvm::DIFile *CGDebugInfo::getOrCreateMainFile() {
-  return DBuilder.createFile(remapDIPath(TheCU->getFilename()),
-                             remapDIPath(TheCU->getDirectory()));
-}
-
-std::string CGDebugInfo::remapDIPath(StringRef Path) const {
-  for (const auto &Entry : DebugPrefixMap)
-    if (Path.startswith(Entry.first))
-      return (Twine(Entry.second) + Path.substr(Entry.first.size())).str();
-  return Path.str();
-}
-
-unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
-  if (Loc.isInvalid() && CurLoc.isInvalid())
-    return 0;
-  SourceManager &SM = CGM.getContext().getSourceManager();
-  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
-  return PLoc.isValid() ? PLoc.getLine() : 0;
-}
-
-unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
-  // We may not want column information at all.
-  if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
-    return 0;
-
-  // If the location is invalid then use the current column.
-  if (Loc.isInvalid() && CurLoc.isInvalid())
-    return 0;
-  SourceManager &SM = CGM.getContext().getSourceManager();
-  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
-  return PLoc.isValid() ? PLoc.getColumn() : 0;
-}
-
-StringRef CGDebugInfo::getCurrentDirname() {
-  if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
-    return CGM.getCodeGenOpts().DebugCompilationDir;
-
-  if (!CWDName.empty())
-    return CWDName;
-  SmallString<256> CWD;
-  llvm::sys::fs::current_path(CWD);
-  return CWDName = internString(CWD);
-}
-
-void CGDebugInfo::CreateCompileUnit() {
-
-  // Should we be asking the SourceManager for the main file name, instead of
-  // accepting it as an argument? This just causes the main file name to
-  // mismatch with source locations and create extra lexical scopes or
-  // mismatched debug info (a CU with a DW_AT_file of "-", because that's what
-  // the driver passed, but functions/other things have DW_AT_file of "<stdin>"
-  // because that's what the SourceManager says)
-
-  // Get absolute path name.
-  SourceManager &SM = CGM.getContext().getSourceManager();
-  std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
-  if (MainFileName.empty())
-    MainFileName = "<stdin>";
-
-  // The main file name provided via the "-main-file-name" option contains just
-  // the file name itself with no path information. This file name may have had
-  // a relative path, so we look into the actual file entry for the main
-  // file to determine the real absolute path for the file.
-  std::string MainFileDir;
-  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
-    MainFileDir = remapDIPath(MainFile->getDir()->getName());
-    if (MainFileDir != ".") {
-      llvm::SmallString<1024> MainFileDirSS(MainFileDir);
-      llvm::sys::path::append(MainFileDirSS, MainFileName);
-      MainFileName = MainFileDirSS.str();
-    }
-  }
-
-  llvm::dwarf::SourceLanguage LangTag;
-  const LangOptions &LO = CGM.getLangOpts();
-  if (LO.CPlusPlus) {
-    if (LO.ObjC1)
-      LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
-    else
-      LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
-  } else if (LO.ObjC1) {
-    LangTag = llvm::dwarf::DW_LANG_ObjC;
-  } else if (LO.C99) {
-    LangTag = llvm::dwarf::DW_LANG_C99;
-  } else {
-    LangTag = llvm::dwarf::DW_LANG_C89;
-  }
-
-  std::string Producer = getClangFullVersion();
-
-  // Figure out which version of the ObjC runtime we have.
-  unsigned RuntimeVers = 0;
-  if (LO.ObjC1)
-    RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
-
-  llvm::DICompileUnit::DebugEmissionKind EmissionKind;
-  switch (DebugKind) {
-  case codegenoptions::NoDebugInfo:
-  case codegenoptions::LocTrackingOnly:
-    EmissionKind = llvm::DICompileUnit::NoDebug;
-    break;
-  case codegenoptions::DebugLineTablesOnly:
-    EmissionKind = llvm::DICompileUnit::LineTablesOnly;
-    break;
-  case codegenoptions::LimitedDebugInfo:
-  case codegenoptions::FullDebugInfo:
-    EmissionKind = llvm::DICompileUnit::FullDebug;
-    break;
-  }
-
-  // Create new compile unit.
-  // FIXME - Eliminate TheCU.
-  TheCU = DBuilder.createCompileUnit(
-      LangTag, remapDIPath(MainFileName), remapDIPath(getCurrentDirname()),
-      Producer, LO.Optimize, CGM.getCodeGenOpts().DwarfDebugFlags, RuntimeVers,
-      CGM.getCodeGenOpts().SplitDwarfFile, EmissionKind, 0 /* DWOid */);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
+llvm::DIType *CGDebugDwarf::CreateType(const BuiltinType *BT) {
   llvm::dwarf::TypeKind Encoding;
   StringRef BTName;
   switch (BT->getKind()) {
 #define BUILTIN_TYPE(Id, SingletonId)
 #define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
 #include "clang/AST/BuiltinTypes.def"
   case BuiltinType::Dependent:
     llvm_unreachable("Unexpected builtin type");
default:
     break;
   }
   // Bit size, align and offset of the type.
   uint64_t Size = CGM.getContext().getTypeSize(BT);
   uint64_t Align = CGM.getContext().getTypeAlign(BT);
   return DBuilder.createBasicType(BTName, Size, Align, Encoding);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
+llvm::DIType *CGDebugDwarf::CreateType(const ComplexType *Ty) {
   // Bit size, align and offset of the type.
   llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
   if (Ty->isComplexIntegerType())
     Encoding = llvm::dwarf::DW_ATE_lo_user;
 
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
   uint64_t Align = CGM.getContext().getTypeAlign(Ty);
   return DBuilder.createBasicType("complex", Size, Align, Encoding);
 }
 
-llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
+llvm::DIType *CGDebugDwarf::CreateQualifiedType(QualType Ty,
                                                 llvm::DIFile *Unit) {
   QualifierCollector Qc;
   const Type *T = Qc.strip(Ty);
 
   // Ignore these qualifiers for now.
   Qc.removeObjCGCAttr();
   Qc.removeAddressSpace();
   Qc.removeObjCLifetime();
 
llvm::DIType *CGDebugDwarf::CreateQualifiedType(QualType Ty,
 
   auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
 
   // No need to fill in the Name, Line, Size, Alignment, Offset in case of
   // CVR derived types.
   return DBuilder.createQualifiedType(Tag, FromTy);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const ObjCObjectPointerType *Ty,
                                        llvm::DIFile *Unit) {
 
   // The frontend treats 'id' as a typedef to an ObjCObjectType,
   // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
   // debug info, we want to emit 'id' in both cases.
   if (Ty->isObjCQualifiedIdType())
     return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
 
   return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
                                Ty->getPointeeType(), Unit);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const PointerType *Ty,
                                        llvm::DIFile *Unit) {
   return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
                                Ty->getPointeeType(), Unit);
 }
 
 /// \return whether a C++ mangling exists for the type defined by TD.
 static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
   switch (TheCU->getSourceLanguage()) {
   case llvm::dwarf::DW_LANG_C_plus_plus:
else {
     // than C++ class type, but needs llvm metadata changes first.
     assert(RD->isClass());
     Tag = llvm::dwarf::DW_TAG_class_type;
   }
   return Tag;
 }
 
 llvm::DICompositeType *
-CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
+CGDebugDwarf::getOrCreateRecordFwdDecl(const RecordType *Ty,
                                        llvm::DIScope *Ctx) {
   const RecordDecl *RD = Ty->getDecl();
   if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
     return cast<llvm::DICompositeType>(T);
   llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
   unsigned Line = getLineNumber(RD->getLocation());
   StringRef RDName = getClassName(RD);
 
   uint64_t Size = 0;
llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
       getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
       llvm::DINode::FlagFwdDecl, FullName);
   ReplaceMap.emplace_back(
       std::piecewise_construct, std::make_tuple(Ty),
       std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
   return RetTy;
 }
 
-llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
+llvm::DIType *CGDebugDwarf::CreatePointerLikeType(llvm::dwarf::Tag Tag,
                                                   const Type *Ty,
                                                   QualType PointeeTy,
                                                   llvm::DIFile *Unit) {
   // Bit size, align and offset of the type.
   // Size is always the size of a pointer. We can't use getTypeSize here
   // because that does not return the correct value for references.
   unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
   uint64_t Size = CGM.getTarget().getPointerWidth(AS);
   uint64_t Align = CGM.getContext().getTypeAlign(Ty);
 
   if (Tag == llvm::dwarf::DW_TAG_reference_type ||
       Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
     return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
                                         Size, Align);
   else
     return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
                                       Align);
 }
 
-llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
+llvm::DIType *CGDebugDwarf::getOrCreateStructPtrType(StringRef Name,
                                                      llvm::DIType *&Cache) {
   if (Cache)
     return Cache;
   Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
                                      TheCU, getOrCreateMainFile(), 0);
   unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
   Cache = DBuilder.createPointerType(Cache, Size);
   return Cache;
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const BlockPointerType *Ty,
                                        llvm::DIFile *Unit) {
   SmallVector<llvm::Metadata *, 8> EltTys;
   QualType FType;
   uint64_t FieldSize, FieldOffset;
   unsigned FieldAlign;
   llvm::DINodeArray Elements;
 
   FieldOffset = 0;
   FType = CGM.getContext().UnsignedLongTy;
llvm::DIType *CGDebugDwarf::CreateType(const BlockPointerType *Ty,
   // them without a name or a location.
   EltTy =
       DBuilder.createStructType(Unit, "", nullptr, LineNo,
                                 FieldOffset, 0, Flags, nullptr, Elements);
 
   return DBuilder.createPointerType(EltTy, Size);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const TemplateSpecializationType *Ty,
                                        llvm::DIFile *Unit) {
   assert(Ty->isTypeAlias());
   llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);
 
   SmallString<128> NS;
   llvm::raw_svector_ostream OS(NS);
   Ty->getTemplateName().print(OS, CGM.getContext().getPrintingPolicy(),
                               /*qualified*/ false);
 
   TemplateSpecializationType::PrintTemplateArgumentList(
       OS, Ty->getArgs(), Ty->getNumArgs(),
       CGM.getContext().getPrintingPolicy());
 
   TypeAliasDecl *AliasDecl = cast<TypeAliasTemplateDecl>(
       Ty->getTemplateName().getAsTemplateDecl())->getTemplatedDecl();
 
   SourceLocation Loc = AliasDecl->getLocation();
   return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
                                 getLineNumber(Loc),
                                 getDeclContextDescriptor(AliasDecl));
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const TypedefType *Ty,
                                        llvm::DIFile *Unit) {
   // We don't set size information, but do specify where the typedef was
   // declared.
   SourceLocation Loc = Ty->getDecl()->getLocation();
 
   // Typedefs are derived from some other type.
   return DBuilder.createTypedef(
       getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
       Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
       getDeclContextDescriptor(Ty->getDecl()));
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const FunctionType *Ty,
                                        llvm::DIFile *Unit) {
   SmallVector<llvm::Metadata *, 16> EltTys;
 
   // Add the result type at least.
   EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
 
   // Set up remainder of arguments if there is a prototype.
   // otherwise emit it as a variadic function.
   if (isa<FunctionNoProtoType>(Ty))
static unsigned getAccessFlag(AccessSpecifier Access, const RecordDecl *RD) {
   case clang::AS_public:
     return llvm::DINode::FlagPublic;
   case clang::AS_none:
     return 0;
   }
   llvm_unreachable("unexpected access enumerator");
 }
 
-llvm::DIType *CGDebugInfo::createFieldType(
+llvm::DIType *CGDebugDwarf::createFieldType(
     StringRef name, QualType type, uint64_t sizeInBitsOverride,
     SourceLocation loc, AccessSpecifier AS, uint64_t offsetInBits,
     llvm::DIFile *tunit, llvm::DIScope *scope, const RecordDecl *RD) {
   llvm::DIType *debugType = getOrCreateType(type, tunit);
 
   // Get the location for the field.
   llvm::DIFile *file = getOrCreateFile(loc);
   unsigned line = getLineNumber(loc);
if (sizeInBitsOverride)
       SizeInBits = sizeInBitsOverride;
   }
 
   unsigned flags = getAccessFlag(AS, RD);
   return DBuilder.createMemberType(scope, name, file, line, SizeInBits,
                                    AlignInBits, offsetInBits, flags, debugType);
 }
 
-void CGDebugInfo::CollectRecordLambdaFields(
+void CGDebugDwarf::CollectRecordLambdaFields(
     const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
     llvm::DIType *RecordTy) {
   // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
   // has the name and the location of the variable so we should iterate over
   // both concurrently.
   const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
   RecordDecl::field_iterator Field = CXXDecl->field_begin();
   unsigned fieldno = 0;
if (C.capturesVariable()) {
           "this", type, 0, f->getLocation(), f->getAccess(),
           layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
 
       elements.push_back(fieldType);
     }
   }
 }
 
-llvm::DIDerivedType *
-CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
-                                     const RecordDecl *RD) {
+llvm::DIDerivedType *CGDebugDwarf::CreateRecordStaticField(
+    const VarDecl *Var, llvm::DIType *RecordTy, const RecordDecl *RD) {
   // Create the descriptor for the static variable, with or without
   // constant initializers.
   Var = Var->getCanonicalDecl();
   llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
   llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);
 
   unsigned LineNumber = getLineNumber(Var->getLocation());
   StringRef VName = Var->getName();
llvm::DIDerivedType *CGDebugDwarf::CreateRecordStaticField(
 
   unsigned Flags = getAccessFlag(Var->getAccess(), RD);
   llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
       RecordTy, VName, VUnit, LineNumber, VTy, Flags, C);
   StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
   return GV;
 }
 
-void CGDebugInfo::CollectRecordNormalField(
+void CGDebugDwarf::CollectRecordNormalField(
     const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
     SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
     const RecordDecl *RD) {
   StringRef name = field->getName();
   QualType type = field->getType();
 
   // Ignore unnamed fields unless they're anonymous structs/unions.
   if (name.empty() && !type->isRecordType())
     return;
 
   uint64_t SizeInBitsOverride = 0;
   if (field->isBitField()) {
     SizeInBitsOverride = field->getBitWidthValue(CGM.getContext());
     assert(SizeInBitsOverride && "found named 0-width bitfield");
   }
 
   llvm::DIType *fieldType =
       createFieldType(name, type, SizeInBitsOverride, field->getLocation(),
                       field->getAccess(), OffsetInBits, tunit, RecordTy, RD);
 
   elements.push_back(fieldType);
 }
 
-void CGDebugInfo::CollectRecordFields(
+void CGDebugDwarf::CollectRecordFields(
     const RecordDecl *record, llvm::DIFile *tunit,
     SmallVectorImpl<llvm::Metadata *> &elements,
     llvm::DICompositeType *RecordTy) {
   const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(record);
 
   if (CXXDecl && CXXDecl->isLambda())
     CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
   else {
for (const auto *I : record->decls())
 
         // Bump field number for next field.
         ++fieldNo;
       }
   }
 }
 
 llvm::DISubroutineType *
-CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
+CGDebugDwarf::getOrCreateMethodType(const CXXMethodDecl *Method,
                                     llvm::DIFile *Unit) {
   const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
   if (Method->isStatic())
     return cast_or_null<llvm::DISubroutineType>(
         getOrCreateType(QualType(Func, 0), Unit));
   return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
                                        Func, Unit);
 }
 
-llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
+llvm::DISubroutineType *CGDebugDwarf::getOrCreateInstanceMethodType(
     QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile *Unit) {
   // Add "this" pointer.
   llvm::DITypeRefArray Args(
       cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
           ->getTypeArray());
   assert(Args.size() && "Invalid number of arguments!");
 
   SmallVector<llvm::Metadata *, 16> Elts;

 static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
   if (const CXXRecordDecl *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
     return isFunctionLocalClass(NRD);
   if (isa<FunctionDecl>(RD->getDeclContext()))
     return true;
   return false;
 }
 
-llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
+llvm::DISubprogram *CGDebugDwarf::CreateCXXMemberFunction(
     const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
   bool IsCtorOrDtor =
       isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
 
   StringRef MethodName = getFunctionName(Method);
   llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit);
 
   // Since a single ctor/dtor corresponds to multiple functions, it doesn't
llvm::DISubprogram *SP = DBuilder.createMethod(
       /* isDefinition=*/false, Virtuality, VIndex, ContainingType, Flags,
       CGM.getLangOpts().Optimize, TParamsArray.get());
 
   SPCache[Method->getCanonicalDecl()].reset(SP);
 
   return SP;
 }
 
-void CGDebugInfo::CollectCXXMemberFunctions(
+void CGDebugDwarf::CollectCXXMemberFunctions(
     const CXXRecordDecl *RD, llvm::DIFile *Unit,
     SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {
 
   // Since we want more than just the individual member decls if we
   // have templated functions iterate over every declaration to gather
   // the functions.
   for (const auto *I : RD->decls()) {
     const auto *Method = dyn_cast<CXXMethodDecl>(I);
for (const auto *I : RD->decls()) {
     // implicit members are emitted in a non-vtable TU.
     auto MI = SPCache.find(Method->getCanonicalDecl());
     EltTys.push_back(MI == SPCache.end()
                          ? CreateCXXMemberFunction(Method, Unit, RecordTy)
                          : static_cast<llvm::Metadata *>(MI->second));
   }
 }
 
-void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
+void CGDebugDwarf::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
                                    SmallVectorImpl<llvm::Metadata *> &EltTys,
                                    llvm::DIType *RecordTy) {
   const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
   for (const auto &BI : RD->bases()) {
     unsigned BFlags = 0;
     uint64_t BaseOffset;
 
     const CXXRecordDecl *Base =
         cast<CXXRecordDecl>(BI.getType()->getAs<RecordType>()->getDecl());
 
for (const auto &BI : RD->bases()) {
     BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
     llvm::DIType *DTy = DBuilder.createInheritance(
         RecordTy, getOrCreateType(BI.getType(), Unit), BaseOffset, BFlags);
     EltTys.push_back(DTy);
   }
 }
 
 llvm::DINodeArray
-CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
+CGDebugDwarf::CollectTemplateParams(const TemplateParameterList *TPList,
                                     ArrayRef<TemplateArgument> TAList,
                                     llvm::DIFile *Unit) {
   SmallVector<llvm::Metadata *, 16> TemplateParams;
   for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
     const TemplateArgument &TA = TAList[i];
     StringRef Name;
     if (TPList)
       Name = TPList->getParam(i)->getName();
     switch (TA.getKind()) {
     case TemplateArgument::Type: {
case TemplateArgument::Null:
       llvm_unreachable(
           "These argument types shouldn't exist in concrete types");
     }
   }
   return DBuilder.getOrCreateArray(TemplateParams);
 }
 
 llvm::DINodeArray
-CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
+CGDebugDwarf::CollectFunctionTemplateParams(const FunctionDecl *FD,
                                             llvm::DIFile *Unit) {
   if (FD->getTemplatedKind() ==
       FunctionDecl::TK_FunctionTemplateSpecialization) {
     const TemplateParameterList *TList = FD->getTemplateSpecializationInfo()
                                              ->getTemplate()
                                              ->getTemplateParameters();
     return CollectTemplateParams(
         TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
   }
   return llvm::DINodeArray();
 }
 
-llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
+llvm::DINodeArray CGDebugDwarf::CollectCXXTemplateParams(
     const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
   // Always get the full list of parameters, not just the ones from
   // the specialization.
   TemplateParameterList *TPList =
       TSpecial->getSpecializedTemplate()->getTemplateParameters();
   const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
   return CollectTemplateParams(TPList, TAList.asArray(), Unit);
 }
 
-llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
+llvm::DIType *CGDebugDwarf::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
   if (VTablePtrType)
     return VTablePtrType;
 
   ASTContext &Context = CGM.getContext();
 
   /* Function type */
   llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
   llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
   llvm::DIType *SubTy = DBuilder.createSubroutineType(SElements);
   unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
   llvm::DIType *vtbl_ptr_type =
       DBuilder.createPointerType(SubTy, Size, 0, "__vtbl_ptr_type");
   VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
   return VTablePtrType;
 }
 
-StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
-  // Copy the gdb compatible name on the side and use its reference.
-  return internString("_vptr$", RD->getNameAsString());
-}
-
-void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
-                                    SmallVectorImpl<llvm::Metadata *> &EltTys) {
+void CGDebugDwarf::CollectVTableInfo(
+    const CXXRecordDecl *RD, llvm::DIFile *Unit,
   const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
 
   // If there is a primary base then it will hold vtable info.
   if (RL.getPrimaryBase())
     return;
 
   // If this class is not dynamic then there is not any vtable info to collect.
   if (!RD->isDynamicClass())
     return;
 
   unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
   llvm::DIType *VPTR = DBuilder.createMemberType(
       Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
       llvm::DINode::FlagArtificial, getOrCreateVTablePtrType(Unit));
   EltTys.push_back(VPTR);
 }
 
-llvm::DIType *CGDebugInfo::getOrCreateRecordType(QualType RTy,
+llvm::DIType *CGDebugDwarf::getOrCreateRecordType(QualType RTy,
                                                   SourceLocation Loc) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
   return T;
 }
 
-llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
+llvm::DIType *CGDebugDwarf::getOrCreateInterfaceType(QualType D,
                                                      SourceLocation Loc) {
   return getOrCreateStandaloneType(D, Loc);
 }
 
-llvm::DIType *CGDebugInfo::getOrCreateStandaloneType(QualType D,
+llvm::DIType *CGDebugDwarf::getOrCreateStandaloneType(QualType D,
                                                       SourceLocation Loc) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   assert(!D.isNull() && "null type");
   llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
   assert(T && "could not create debug info for type");
 
   // Composite types with UIDs were already retained by DIBuilder
   // because they are only referenced by name in the IR.
   if (auto *CTy = dyn_cast<llvm::DICompositeType>(T))
     if (!CTy->getIdentifier().empty())
       return T;
   RetainedTypes.push_back(D.getAsOpaquePtr());
   return T;
 }
 
-void CGDebugInfo::completeType(const EnumDecl *ED) {
+void CGDebugDwarf::completeType(const EnumDecl *ED) {
   if (DebugKind <= codegenoptions::DebugLineTablesOnly)
     return;
   QualType Ty = CGM.getContext().getEnumType(ED);
   void *TyPtr = Ty.getAsOpaquePtr();
   auto I = TypeCache.find(TyPtr);
   if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
     return;
   llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
   assert(!Res->isForwardDecl());
   TypeCache[TyPtr].reset(Res);
 }
 
-void CGDebugInfo::completeType(const RecordDecl *RD) {
+void CGDebugDwarf::completeType(const RecordDecl *RD) {
   if (DebugKind > codegenoptions::LimitedDebugInfo ||
       !CGM.getLangOpts().CPlusPlus)
     completeRequiredType(RD);
 }
 
-void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
+void CGDebugDwarf::completeRequiredType(const RecordDecl *RD) {
   if (DebugKind <= codegenoptions::DebugLineTablesOnly)
     return;
 
   if (const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
     if (CXXDecl->isDynamicClass())
       return;
 
   if (DebugTypeExtRefs && RD->isFromASTFile())
     return;
 
   QualType Ty = CGM.getContext().getRecordType(RD);
   llvm::DIType *T = getTypeOrNull(Ty);
   if (T && T->isForwardDecl())
     completeClassData(RD);
 }
 
-void CGDebugInfo::completeClassData(const RecordDecl *RD) {
+void CGDebugDwarf::completeClassData(const RecordDecl *RD) {
   if (DebugKind <= codegenoptions::DebugLineTablesOnly)
     return;
   QualType Ty = CGM.getContext().getRecordType(RD);
   void *TyPtr = Ty.getAsOpaquePtr();
   auto I = TypeCache.find(TyPtr);
   if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
     return;
   llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
static bool shouldOmitDefinition(codegenoptions::DebugInfoKind DebugKind,
   if (Spec == TSK_ExplicitInstantiationDeclaration &&
       hasExplicitMemberDefinition(CXXDecl->method_begin(),
                                   CXXDecl->method_end()))
     return true;
 
   return false;
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
+llvm::DIType *CGDebugDwarf::CreateType(const RecordType *Ty) {
   RecordDecl *RD = Ty->getDecl();
   llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
   if (T || shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD,
                                 CGM.getLangOpts())) {
     if (!T)
       T = getOrCreateRecordFwdDecl(Ty, getDeclContextDescriptor(RD));
     return T;
   }
 
   return CreateTypeDefinition(Ty);
 }
 
-llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
+llvm::DIType *CGDebugDwarf::CreateTypeDefinition(const RecordType *Ty) {
   RecordDecl *RD = Ty->getDecl();
 
   // Get overall information about the record type for the debug info.
   llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
 
   // Records and classes and unions can all be recursive.  To handle them, we
   // first generate a debug descriptor for the struct as a forward declaration.
   // Then (if it is a definition) we go through and get debug info for all of
llvm::DIType *CGDebugDwarf::CreateTypeDefinition(const RecordType *Ty) {
   if (FwdDecl->isTemporary())
     FwdDecl =
         llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));
 
   RegionMap[Ty->getDecl()].reset(FwdDecl);
   return FwdDecl;
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const ObjCObjectType *Ty,
                                        llvm::DIFile *Unit) {
   // Ignore protocols.
   return getOrCreateType(Ty->getBaseType(), Unit);
 }
 
 /// \return true if Getter has the default name for the property PD.
 static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
                                  const ObjCMethodDecl *Getter) {
   assert(PD);
static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
   if (!Setter)
     return true;
 
   assert(Setter->getDeclName().isObjCOneArgSelector());
   return SelectorTable::constructSetterName(PD->getName()) ==
          Setter->getDeclName().getObjCSelector().getNameForSlot(0);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const ObjCInterfaceType *Ty,
                                        llvm::DIFile *Unit) {
   ObjCInterfaceDecl *ID = Ty->getDecl();
   if (!ID)
     return nullptr;
 
   // Return a forward declaration if this type was imported from a clang module.
   if (DebugTypeExtRefs && ID->isFromASTFile() && ID->getDefinition())
     return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
                                       ID->getName(),
if (!Def || !Def->getImplementation()) {
     ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
     return FwdDecl;
   }
 
   return CreateTypeDefinition(Ty, Unit);
 }
 
 llvm::DIModule *
-CGDebugInfo::getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
+CGDebugDwarf::getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
                                    bool CreateSkeletonCU) {
   // Use the Module pointer as the key into the cache. This is a
   // nullptr if the "Module" is a PCH, which is safe because we don't
   // support chained PCH debug info, so there can only be a single PCH.
   const Module *M = Mod.getModuleOrNull();
   auto ModRef = ModuleCache.find(M);
   if (ModRef != ModuleCache.end())
     return cast<llvm::DIModule>(ModRef->second);
 
llvm::DIModule *Parent =
                          CreateSkeletonCU);
   llvm::DIModule *DIMod =
       DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
                             Mod.getPath(), CGM.getHeaderSearchOpts().Sysroot);
   ModuleCache[M].reset(DIMod);
   return DIMod;
 }
 
-llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
+llvm::DIType *CGDebugDwarf::CreateTypeDefinition(const ObjCInterfaceType *Ty,
                                                  llvm::DIFile *Unit) {
   ObjCInterfaceDecl *ID = Ty->getDecl();
   llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
   unsigned Line = getLineNumber(ID->getLocation());
   unsigned RuntimeLang = TheCU->getSourceLanguage();
 
   // Bit size, align and offset of the type.
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
   uint64_t Align = CGM.getContext().getTypeAlign(Ty);
llvm::DIType *CGDebugDwarf::CreateTypeDefinition(const ObjCInterfaceType *Ty,
 
   llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
   DBuilder.replaceArrays(RealDecl, Elements);
 
   LexicalBlockStack.pop_back();
   return RealDecl;
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const VectorType *Ty,
                                        llvm::DIFile *Unit) {
   llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
   int64_t Count = Ty->getNumElements();
   if (Count == 0)
     // If number of elements are not known then this is an unbounded array.
     // Use Count == -1 to express such arrays.
     Count = -1;
 
   llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(0, Count);
   llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
 
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
   uint64_t Align = CGM.getContext().getTypeAlign(Ty);
 
   return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
+llvm::DIType *CGDebugDwarf::CreateType(const ArrayType *Ty,
+                                       llvm::DIFile *Unit) {
   uint64_t Size;
   uint64_t Align;
 
   // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
   if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
     Size = 0;
     Align =
         CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
llvm::DIType *CGDebugDwarf::CreateType(const ArrayType *Ty,
   }
 
   llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
 
   return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
                                   SubscriptArray);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const LValueReferenceType *Ty,
                                        llvm::DIFile *Unit) {
   return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
                                Ty->getPointeeType(), Unit);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const RValueReferenceType *Ty,
                                        llvm::DIFile *Unit) {
   return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
                                Ty->getPointeeType(), Unit);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
+llvm::DIType *CGDebugDwarf::CreateType(const MemberPointerType *Ty,
                                        llvm::DIFile *U) {
   uint64_t Size =
       !Ty->isIncompleteType() ? CGM.getContext().getTypeSize(Ty) : 0;
   llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
   if (Ty->isMemberDataPointerType())
     return DBuilder.createMemberPointerType(
         getOrCreateType(Ty->getPointeeType(), U), ClassType, Size);
 
   const FunctionProtoType *FPT =
       Ty->getPointeeType()->getAs<FunctionProtoType>();
   return DBuilder.createMemberPointerType(
       getOrCreateInstanceMethodType(CGM.getContext().getPointerType(QualType(
                                         Ty->getClass(), FPT->getTypeQuals())),
                                     FPT, U),
       ClassType, Size);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
+llvm::DIType *CGDebugDwarf::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
   // Ignore the atomic wrapping
   // FIXME: What is the correct representation?
   return getOrCreateType(Ty->getValueType(), U);
 }
 
-llvm::DIType* CGDebugInfo::CreateType(const PipeType *Ty,
-                                     llvm::DIFile *U) {
+llvm::DIType *CGDebugDwarf::CreateType(const PipeType *Ty, llvm::DIFile *U) {
   return getOrCreateType(Ty->getElementType(), U);
 }
 
-llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
+llvm::DIType *CGDebugDwarf::CreateEnumType(const EnumType *Ty) {
   const EnumDecl *ED = Ty->getDecl();
 
   uint64_t Size = 0;
   uint64_t Align = 0;
   if (!ED->getTypeForDecl()->isIncompleteType()) {
     Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
     Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
   }
ReplaceMap.emplace_back(
         std::piecewise_construct, std::make_tuple(Ty),
         std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
     return RetTy;
   }
 
   return CreateTypeDefinition(Ty);
 }
 
-llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
+llvm::DIType *CGDebugDwarf::CreateTypeDefinition(const EnumType *Ty) {
   const EnumDecl *ED = Ty->getDecl();
   uint64_t Size = 0;
   uint64_t Align = 0;
   if (!ED->getTypeForDecl()->isIncompleteType()) {
     Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
     Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
   }
 
case Type::Auto:
       break;
     }
 
     assert(T != LastT && "Type unwrapping failed to unwrap!");
     (void)LastT;
   } while (true);
 }
 
-llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
+llvm::DIType *CGDebugDwarf::getTypeOrNull(QualType Ty) {
 
   // Unwrap the type as needed for debug information.
   Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
 
   auto it = TypeCache.find(Ty.getAsOpaquePtr());
   if (it != TypeCache.end()) {
     // Verify that the debug info still exists.
     if (llvm::Metadata *V = it->second)
       return cast<llvm::DIType>(V);
   }
 
   return nullptr;
 }
 
-void CGDebugInfo::completeTemplateDefinition(
+void CGDebugDwarf::completeTemplateDefinition(
     const ClassTemplateSpecializationDecl &SD) {
   if (DebugKind <= codegenoptions::DebugLineTablesOnly)
     return;
 
   completeClassData(&SD);
   // In case this type has no member function definitions being emitted, ensure
   // it is retained
-  RetainedTypes.push_back(CGM.getContext().getRecordType(&SD).getAsOpaquePtr());
+  retainType(CGM.getContext().getRecordType(&SD).getAsOpaquePtr());
 }
 
-llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
+llvm::DIType *CGDebugDwarf::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
   if (Ty.isNull())
     return nullptr;
 
   // Unwrap the type as needed for debug information.
   Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
 
   if (auto *T = getTypeOrNull(Ty))
     return T;
 
   llvm::DIType *Res = CreateTypeNode(Ty, Unit);
   void* TyPtr = Ty.getAsOpaquePtr();
 
   // And update the type cache.
   TypeCache[TyPtr].reset(Res);
 
   return Res;
 }
 
-llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
+llvm::DIModule *CGDebugDwarf::getParentModuleOrNull(const Decl *D) {
   // A forward declaration inside a module header does not belong to the module.
   if (isa<RecordDecl>(D) && !cast<RecordDecl>(D)->getDefinition())
     return nullptr;
   if (DebugTypeExtRefs && D->isFromASTFile()) {
     // Record a reference to an imported clang module or precompiled header.
     auto *Reader = CGM.getContext().getExternalSource();
     auto Idx = D->getOwningModuleID();
     auto Info = Reader->getSourceDescriptor(Idx);
if (Module *M = ClangModuleMap->inferModuleFromLocation(Loc)) {
       // This the precompiled header being built.
       return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
     }
   }
 
   return nullptr;
 }
 
-llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
+llvm::DIType *CGDebugDwarf::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
   // Handle qualifiers, which recursively handles what they refer to.
   if (Ty.hasLocalQualifiers())
     return CreateQualifiedType(Ty, Unit);
 
   // Work out details of type.
   switch (Ty->getTypeClass()) {
 #define TYPE(Class, Base)
 #define ABSTRACT_TYPE(Class, Base)
#include "clang/AST/TypeNodes.def"
   case Type::UnaryTransform:
   case Type::PackExpansion:
     break;
   }
 
   llvm_unreachable("type should have been unwrapped!");
 }
 
-llvm::DICompositeType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
-                                                           llvm::DIFile *Unit) {
+llvm::DICompositeType *
+CGDebugDwarf::getOrCreateLimitedType(const RecordType *Ty, llvm::DIFile *Unit) {
   QualType QTy(Ty, 0);
 
   auto *T = cast_or_null<llvm::DICompositeType>(getTypeOrNull(QTy));
 
   // We may have cached a forward decl when we could have created
   // a non-forward decl. Go ahead and create a non-forward decl
   // now.
   if (T && !T->isForwardDecl())
     return T;
 
   // Otherwise create the type.
   llvm::DICompositeType *Res = CreateLimitedType(Ty);
 
   // Propagate members from the declaration to the definition
   // CreateType(const RecordType*) will overwrite this with the members in the
   // correct order if the full type is needed.
   DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());
 
   // And update the type cache.
   TypeCache[QTy.getAsOpaquePtr()].reset(Res);
   return Res;
 }
 
 // TODO: Currently used for context chains when limiting debug info.
-llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
+llvm::DICompositeType *CGDebugDwarf::CreateLimitedType(const RecordType *Ty) {
   RecordDecl *RD = Ty->getDecl();
 
   // Get overall information about the record type for the debug info.
   llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
   unsigned Line = getLineNumber(RD->getLocation());
   StringRef RDName = getClassName(RD);
 
   llvm::DIScope *RDContext = getDeclContextDescriptor(RD);
llvm::DICompositeType *CGDebugDwarf::CreateLimitedType(const RecordType *Ty) {
 
   if (const ClassTemplateSpecializationDecl *TSpecial =
           dyn_cast<ClassTemplateSpecializationDecl>(RD))
     DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
                            CollectCXXTemplateParams(TSpecial, DefUnit));
   return RealDecl;
 }
 
-void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
+void CGDebugDwarf::CollectContainingType(const CXXRecordDecl *RD,
                                          llvm::DICompositeType *RealDecl) {
   // A class's primary base or the class itself contains the vtable.
   llvm::DICompositeType *ContainingType = nullptr;
   const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
   if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
     // Seek non-virtual primary base root.
     while (1) {
       const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
       const CXXRecordDecl *PBT = BRL.getPrimaryBase();
       if (PBT && !BRL.isPrimaryBaseVirtual())
         PBase = PBT;
       else
         break;
     }
     ContainingType = cast<llvm::DICompositeType>(
         getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
                         getOrCreateFile(RD->getLocation())));
   } else if (RD->isDynamicClass())
     ContainingType = RealDecl;
 
   DBuilder.replaceVTableHolder(RealDecl, ContainingType);
 }
 
-llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
+llvm::DIType *CGDebugDwarf::CreateMemberType(llvm::DIFile *Unit, QualType FType,
                                              StringRef Name, uint64_t *Offset) {
-  llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
+  llvm::DIType *FieldTy = CGDebugDwarf::getOrCreateType(FType, Unit);
   uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
   unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
   llvm::DIType *Ty = DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize,
                                                FieldAlign, *Offset, 0, FieldTy);
   *Offset += FieldSize;
   return Ty;
 }
 
-void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
-                                           StringRef &Name,
-                                           StringRef &LinkageName,
-                                           llvm::DIScope *&FDContext,
-                                           llvm::DINodeArray &TParamsArray,
-                                           unsigned &Flags) {
-  const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
-  Name = getFunctionName(FD);
-  // Use mangled name as linkage name for C/C++ functions.
-  if (FD->hasPrototype()) {
-    LinkageName = CGM.getMangledName(GD);
-    Flags |= llvm::DINode::FlagPrototyped;
-  }
-  // No need to replicate the linkage name if it isn't different from the
-  // subprogram name, no need to have it at all unless coverage is enabled or
-  // debug is set to more than just line tables.
-  if (LinkageName == Name || (!CGM.getCodeGenOpts().EmitGcovArcs &&
-                              !CGM.getCodeGenOpts().EmitGcovNotes &&
-                              DebugKind <= codegenoptions::DebugLineTablesOnly))
-    LinkageName = StringRef();
-
-  if (DebugKind >= codegenoptions::LimitedDebugInfo) {
-    if (const NamespaceDecl *NSDecl =
-        dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
-      FDContext = getOrCreateNameSpace(NSDecl);
-    else if (const RecordDecl *RDecl =
-             dyn_cast_or_null<RecordDecl>(FD->getDeclContext())) {
-      llvm::DIScope *Mod = getParentModuleOrNull(RDecl);
-      FDContext = getContextDescriptor(RDecl, Mod ? Mod : TheCU);
-    }
-    // Collect template parameters.
-    TParamsArray = CollectFunctionTemplateParams(FD, Unit);
-  }
-}
-
-void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
-                                      unsigned &LineNo, QualType &T,
-                                      StringRef &Name, StringRef &LinkageName,
-                                      llvm::DIScope *&VDContext) {
-  Unit = getOrCreateFile(VD->getLocation());
-  LineNo = getLineNumber(VD->getLocation());
-
-  setLocation(VD->getLocation());
-
-  T = VD->getType();
-  if (T->isIncompleteArrayType()) {
-    // CodeGen turns int[] into int[1] so we'll do the same here.
-    llvm::APInt ConstVal(32, 1);
-    QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
-
-    T = CGM.getContext().getConstantArrayType(ET, ConstVal,
-                                              ArrayType::Normal, 0);
-  }
-
-  Name = VD->getName();
-  if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
-      !isa<ObjCMethodDecl>(VD->getDeclContext()))
-    LinkageName = CGM.getMangledName(VD);
-  if (LinkageName == Name)
-    LinkageName = StringRef();
-
-  // Since we emit declarations (DW_AT_members) for static members, place the
-  // definition of those static members in the namespace they were declared in
-  // in the source code (the lexical decl context).
-  // FIXME: Generalize this for even non-member global variables where the
-  // declaration and definition may have different lexical decl contexts, once
-  // we have support for emitting declarations of (non-member) global variables.
-  const DeclContext *DC = VD->isStaticDataMember() ? VD->getLexicalDeclContext()
-                                                   : VD->getDeclContext();
-  // When a record type contains an in-line initialization of a static data
-  // member, and the record type is marked as __declspec(dllexport), an implicit
-  // definition of the member will be created in the record context.  DWARF
-  // doesn't seem to have a nice way to describe this in a form that consumers
-  // are likely to understand, so fake the "normal" situation of a definition
-  // outside the class by putting it in the global scope.
-  if (DC->isRecord())
-    DC = CGM.getContext().getTranslationUnitDecl();
-
- llvm::DIScope *Mod = getParentModuleOrNull(VD);
- VDContext = getContextDescriptor(cast<Decl>(DC), Mod ? Mod : TheCU);
-}
-
-llvm::DISubprogram *
-CGDebugInfo::getFunctionForwardDeclaration(const FunctionDecl *FD) {
-  llvm::DINodeArray TParamsArray;
-  StringRef Name, LinkageName;
-  unsigned Flags = 0;
-  SourceLocation Loc = FD->getLocation();
-  llvm::DIFile *Unit = getOrCreateFile(Loc);
-  llvm::DIScope *DContext = Unit;
-  unsigned Line = getLineNumber(Loc);
-
-  collectFunctionDeclProps(FD, Unit, Name, LinkageName, DContext,
-                           TParamsArray, Flags);
-  // Build function type.
-  SmallVector<QualType, 16> ArgTypes;
-  for (const ParmVarDecl *Parm: FD->parameters())
-    ArgTypes.push_back(Parm->getType());
-  QualType FnType =
-    CGM.getContext().getFunctionType(FD->getReturnType(), ArgTypes,
-                                     FunctionProtoType::ExtProtoInfo());
-  llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
-      DContext, Name, LinkageName, Unit, Line,
-      getOrCreateFunctionType(FD, FnType, Unit), !FD->isExternallyVisible(),
-      /* isDefinition = */ false, 0, Flags, CGM.getLangOpts().Optimize,
-      TParamsArray.get(), getFunctionDeclaration(FD));
-  const FunctionDecl *CanonDecl = cast<FunctionDecl>(FD->getCanonicalDecl());
-  FwdDeclReplaceMap.emplace_back(std::piecewise_construct,
-                                 std::make_tuple(CanonDecl),
-                                 std::make_tuple(SP));
-  return SP;
-}
-
-llvm::DIGlobalVariable *
-CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
-  QualType T;
-  StringRef Name, LinkageName;
-  SourceLocation Loc = VD->getLocation();
-  llvm::DIFile *Unit = getOrCreateFile(Loc);
-  llvm::DIScope *DContext = Unit;
-  unsigned Line = getLineNumber(Loc);
-
-  collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, DContext);
-  auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
-      DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
-      !VD->isExternallyVisible(), nullptr, nullptr);
-  FwdDeclReplaceMap.emplace_back(
-      std::piecewise_construct,
-      std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
-      std::make_tuple(static_cast<llvm::Metadata *>(GV)));
-  return GV;
-}
-
-llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
-  // We only need a declaration (not a definition) of the type - so use whatever
-  // we would otherwise do to get a type for a pointee. (forward declarations in
-  // limited debug info, full definitions (if the type definition is available)
-  // in unlimited debug info)
-  if (const TypeDecl *TD = dyn_cast<TypeDecl>(D))
-    return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
-                           getOrCreateFile(TD->getLocation()));
-  auto I = DeclCache.find(D->getCanonicalDecl());
-
-  if (I != DeclCache.end())
-    return dyn_cast_or_null<llvm::DINode>(I->second);
-
-  // No definition for now. Emit a forward definition that might be
-  // merged with a potential upcoming definition.
-  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
-    return getFunctionForwardDeclaration(FD);
-  else if (const auto *VD = dyn_cast<VarDecl>(D))
-    return getGlobalVariableForwardDeclaration(VD);
-
-  return nullptr;
-}
-
-llvm::DISubprogram *CGDebugInfo::getFunctionDeclaration(const Decl *D) {
-  if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
-    return nullptr;
-
-  const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
-  if (!FD)
-    return nullptr;
-
-  // Setup context.
-  auto *S = getDeclContextDescriptor(D);
-
-  auto MI = SPCache.find(FD->getCanonicalDecl());
-  if (MI == SPCache.end()) {
-    if (const CXXMethodDecl *MD =
-            dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
-      return CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()),
-                                     cast<llvm::DICompositeType>(S));
-    }
-  }
-  if (MI != SPCache.end()) {
-    auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
-    if (SP && !SP->isDefinition())
-      return SP;
-  }
-
-  for (auto NextFD : FD->redecls()) {
-    auto MI = SPCache.find(NextFD->getCanonicalDecl());
-    if (MI != SPCache.end()) {
-      auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
-      if (SP && !SP->isDefinition())
-        return SP;
-    }
-  }
-  return nullptr;
-}
-
 // getOrCreateFunctionType - Construct type. If it is a c++ method, include
 // implicit parameter "this".
-llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
+llvm::DISubroutineType *CGDebugDwarf::getOrCreateFunctionType(const Decl *D,
                                                               QualType FnType,
                                                               llvm::DIFile *F) {
   if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
     // Create fake but valid subroutine type. Otherwise -verify would fail, and
     // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
     return DBuilder.createSubroutineType(DBuilder.getOrCreateTypeArray(None));
 
   if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
     return getOrCreateMethodType(Method, F);
   if (const ObjCMethodDecl *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
if (FD->isVariadic()) {
       EltTys.push_back(DBuilder.createUnspecifiedParameter());
       llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
       return DBuilder.createSubroutineType(EltTypeArray);
     }
 
   return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
 }
 
-void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
-                                    SourceLocation ScopeLoc, QualType FnType,
-                                    llvm::Function *Fn, CGBuilderTy &Builder) {
-
-  StringRef Name;
-  StringRef LinkageName;
-
-  FnBeginRegionCount.push_back(LexicalBlockStack.size());
-
-  const Decl *D = GD.getDecl();
-  bool HasDecl = (D != nullptr);
-
-  unsigned Flags = 0;
-  llvm::DIFile *Unit = getOrCreateFile(Loc);
-  llvm::DIScope *FDContext = Unit;
-  llvm::DINodeArray TParamsArray;
-  if (!HasDecl) {
-    // Use llvm function name.
-    LinkageName = Fn->getName();
-  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
-    // If there is a subprogram for this function available then use it.
-    auto FI = SPCache.find(FD->getCanonicalDecl());
-    if (FI != SPCache.end()) {
-      auto *SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
-      if (SP && SP->isDefinition()) {
-        LexicalBlockStack.emplace_back(SP);
-        RegionMap[D].reset(SP);
-        return;
-      }
-    }
-    collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
-                             TParamsArray, Flags);
-  } else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {
-    Name = getObjCMethodName(OMD);
-    Flags |= llvm::DINode::FlagPrototyped;
-  } else {
-    // Use llvm function name.
-    Name = Fn->getName();
-    Flags |= llvm::DINode::FlagPrototyped;
-  }
-  if (!Name.empty() && Name[0] == '\01')
-    Name = Name.substr(1);
-
-  if (!HasDecl || D->isImplicit()) {
-    Flags |= llvm::DINode::FlagArtificial;
-    // Artificial functions without a location should not silently reuse CurLoc.
-    if (Loc.isInvalid())
-      CurLoc = SourceLocation();
-  }
-  unsigned LineNo = getLineNumber(Loc);
-  unsigned ScopeLine = getLineNumber(ScopeLoc);
-
-  // FIXME: The function declaration we're constructing here is mostly reusing
-  // declarations from CXXMethodDecl and not constructing new ones for arbitrary
-  // FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
-  // all subprograms instead of the actual context since subprogram definitions
-  // are emitted as CU level entities by the backend.
-  llvm::DISubprogram *SP = DBuilder.createFunction(
-      FDContext, Name, LinkageName, Unit, LineNo,
-      getOrCreateFunctionType(D, FnType, Unit), Fn->hasInternalLinkage(),
-      true /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize,
-      TParamsArray.get(), getFunctionDeclaration(D));
-  Fn->setSubprogram(SP);
-  // We might get here with a VarDecl in the case we're generating
-  // code for the initialization of globals. Do not record these decls
-  // as they will overwrite the actual VarDecl Decl in the cache.
-  if (HasDecl && isa<FunctionDecl>(D))
-    DeclCache[D->getCanonicalDecl()].reset(static_cast<llvm::Metadata *>(SP));
-
-  // Push the function onto the lexical block stack.
-  LexicalBlockStack.emplace_back(SP);
-
-  if (HasDecl)
-    RegionMap[D].reset(SP);
-}
-
-void CGDebugInfo::EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
-                                   QualType FnType) {
-  StringRef Name;
-  StringRef LinkageName;
-
-  const Decl *D = GD.getDecl();
-  if (!D)
-    return;
-
-  unsigned Flags = 0;
-  llvm::DIFile *Unit = getOrCreateFile(Loc);
-  llvm::DIScope *FDContext = getDeclContextDescriptor(D);
-  llvm::DINodeArray TParamsArray;
-  if (isa<FunctionDecl>(D)) {
-    // If there is a DISubprogram for this function available then use it.
-    collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
-                             TParamsArray, Flags);
-  } else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {
-    Name = getObjCMethodName(OMD);
-    Flags |= llvm::DINode::FlagPrototyped;
-  } else {
-    llvm_unreachable("not a function or ObjC method");
-  }
-  if (!Name.empty() && Name[0] == '\01')
-    Name = Name.substr(1);
-
-  if (D->isImplicit()) {
-    Flags |= llvm::DINode::FlagArtificial;
-    // Artificial functions without a location should not silently reuse CurLoc.
-    if (Loc.isInvalid())
-      CurLoc = SourceLocation();
-  }
-  unsigned LineNo = getLineNumber(Loc);
-  unsigned ScopeLine = 0;
-
-  DBuilder.createFunction(FDContext, Name, LinkageName, Unit, LineNo,
-                          getOrCreateFunctionType(D, FnType, Unit),
-                          false /*internalLinkage*/, true /*definition*/,
-                          ScopeLine, Flags, CGM.getLangOpts().Optimize,
-                          TParamsArray.get(), getFunctionDeclaration(D));
-}
-
-void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
-  // Update our current location
-  setLocation(Loc);
-
-  if (CurLoc.isInvalid() || CurLoc.isMacroID())
-    return;
-
-  llvm::MDNode *Scope = LexicalBlockStack.back();
-  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
-      getLineNumber(CurLoc), getColumnNumber(CurLoc), Scope));
-}
-
-void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
-  llvm::MDNode *Back = nullptr;
-  if (!LexicalBlockStack.empty())
-    Back = LexicalBlockStack.back().get();
-  LexicalBlockStack.emplace_back(DBuilder.createLexicalBlock(
-      cast<llvm::DIScope>(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
-      getColumnNumber(CurLoc)));
-}
-
-void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
-                                        SourceLocation Loc) {
-  // Set our current location.
-  setLocation(Loc);
-
-  // Emit a line table change for the current location inside the new scope.
-  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
-      getLineNumber(Loc), getColumnNumber(Loc), LexicalBlockStack.back()));
-
-  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
-    return;
-
-  // Create a new lexical block and push it on the stack.
-  CreateLexicalBlock(Loc);
-}
-
-void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
-                                      SourceLocation Loc) {
-  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
-
-  // Provide an entry in the line table for the end of the block.
-  EmitLocation(Builder, Loc);
-
-  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
-    return;
-
-  LexicalBlockStack.pop_back();
-}
-
-void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
-  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
-  unsigned RCount = FnBeginRegionCount.back();
-  assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
-
-  // Pop all regions for this function.
-  while (LexicalBlockStack.size() != RCount) {
-    // Provide an entry in the line table for the end of the block.
-    EmitLocation(Builder, CurLoc);
-    LexicalBlockStack.pop_back();
-  }
-  FnBeginRegionCount.pop_back();
-}
-
-llvm::DIType *CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
+llvm::DIType *CGDebugDwarf::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
                                                          uint64_t *XOffset) {
 
   SmallVector<llvm::Metadata *, 5> EltTys;
   QualType FType;
   uint64_t FieldSize, FieldOffset;
   unsigned FieldAlign;
 
   llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
   QualType Type = VD->getType();
llvm::DIType *CGDebugDwarf::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
   llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
 
   unsigned Flags = llvm::DINode::FlagBlockByrefStruct;
 
   return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
                                    nullptr, Elements);
 }
 
-void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::Value *Storage,
-                              llvm::Optional<unsigned> ArgNo,
-                              CGBuilderTy &Builder) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
-
-  bool Unwritten =
-      VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
-                           cast<Decl>(VD->getDeclContext())->isImplicit());
-  llvm::DIFile *Unit = nullptr;
-  if (!Unwritten)
-    Unit = getOrCreateFile(VD->getLocation());
-  llvm::DIType *Ty;
-  uint64_t XOffset = 0;
-  if (VD->hasAttr<BlocksAttr>())
-    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
-  else
-    Ty = getOrCreateType(VD->getType(), Unit);
-
-  // If there is no debug info for this type then do not emit debug info
-  // for this variable.
-  if (!Ty)
-    return;
-
-  // Get location information.
-  unsigned Line = 0;
-  unsigned Column = 0;
-  if (!Unwritten) {
-    Line = getLineNumber(VD->getLocation());
-    Column = getColumnNumber(VD->getLocation());
-  }
-  SmallVector<int64_t, 9> Expr;
-  unsigned Flags = 0;
-  if (VD->isImplicit())
-    Flags |= llvm::DINode::FlagArtificial;
-  // If this is the first argument and it is implicit then
-  // give it an object pointer flag.
-  // FIXME: There has to be a better way to do this, but for static
-  // functions there won't be an implicit param at arg1 and
-  // otherwise it is 'self' or 'this'.
-  if (isa<ImplicitParamDecl>(VD) && ArgNo && *ArgNo == 1)
-    Flags |= llvm::DINode::FlagObjectPointer;
-  if (llvm::Argument *Arg = dyn_cast<llvm::Argument>(Storage))
-    if (Arg->getType()->isPointerTy() && !Arg->hasByValAttr() &&
-        !VD->getType()->isPointerType())
-      Expr.push_back(llvm::dwarf::DW_OP_deref);
-
-  auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
-
-  StringRef Name = VD->getName();
-  if (!Name.empty()) {
-    if (VD->hasAttr<BlocksAttr>()) {
-      CharUnits offset = CharUnits::fromQuantity(32);
-      Expr.push_back(llvm::dwarf::DW_OP_plus);
-      // offset of __forwarding field
-      offset = CGM.getContext().toCharUnitsFromBits(
-          CGM.getTarget().getPointerWidth(0));
-      Expr.push_back(offset.getQuantity());
-      Expr.push_back(llvm::dwarf::DW_OP_deref);
-      Expr.push_back(llvm::dwarf::DW_OP_plus);
-      // offset of x field
-      offset = CGM.getContext().toCharUnitsFromBits(XOffset);
-      Expr.push_back(offset.getQuantity());
-
-      // Create the descriptor for the variable.
-      auto *D = ArgNo
-                    ? DBuilder.createParameterVariable(Scope, VD->getName(),
-                                                       *ArgNo, Unit, Line, Ty)
-                    : DBuilder.createAutoVariable(Scope, VD->getName(), Unit,
-                                                  Line, Ty);
-
-      // Insert an llvm.dbg.declare into the current block.
-      DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
-                             llvm::DebugLoc::get(Line, Column, Scope),
-                             Builder.GetInsertBlock());
-      return;
-    } else if (isa<VariableArrayType>(VD->getType()))
-      Expr.push_back(llvm::dwarf::DW_OP_deref);
-  } else if (const RecordType *RT = dyn_cast<RecordType>(VD->getType())) {
-    // If VD is an anonymous union then Storage represents value for
-    // all union fields.
-    const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
-    if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
-      // GDB has trouble finding local variables in anonymous unions, so we emit
-      // artifical local variables for each of the members.
-      //
-      // FIXME: Remove this code as soon as GDB supports this.
-      // The debug info verifier in LLVM operates based on the assumption that a
-      // variable has the same size as its storage and we had to disable the check
-      // for artificial variables.
-      for (const auto *Field : RD->fields()) {
-        llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
-        StringRef FieldName = Field->getName();
-
-        // Ignore unnamed fields. Do not ignore unnamed records.
-        if (FieldName.empty() && !isa<RecordType>(Field->getType()))
-          continue;
-
-        // Use VarDecl's Tag, Scope and Line number.
-        auto *D = DBuilder.createAutoVariable(
-            Scope, FieldName, Unit, Line, FieldTy, CGM.getLangOpts().Optimize,
-            Flags | llvm::DINode::FlagArtificial);
-
-        // Insert an llvm.dbg.declare into the current block.
-        DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
-                               llvm::DebugLoc::get(Line, Column, Scope),
-                               Builder.GetInsertBlock());
-      }
-    }
-  }
-
-  // Create the descriptor for the variable.
-  auto *D =
-      ArgNo
-          ? DBuilder.createParameterVariable(Scope, Name, *ArgNo, Unit, Line,
-                                             Ty, CGM.getLangOpts().Optimize,
-                                             Flags)
-          : DBuilder.createAutoVariable(Scope, Name, Unit, Line, Ty,
-                                        CGM.getLangOpts().Optimize, Flags);
-
-  // Insert an llvm.dbg.declare into the current block.
-  DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
-                         llvm::DebugLoc::get(Line, Column, Scope),
-                         Builder.GetInsertBlock());
-}
-
-void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
-                                            llvm::Value *Storage,
-                                            CGBuilderTy &Builder) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  EmitDeclare(VD, Storage, llvm::None, Builder);
-}
-
-llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
+llvm::DIType *CGDebugDwarf::CreateSelfType(const QualType &QualTy,
                                            llvm::DIType *Ty) {
   llvm::DIType *CachedTy = getTypeOrNull(QualTy);
   if (CachedTy)
     Ty = CachedTy;
   return DBuilder.createObjectPointerType(Ty);
 }
 
-void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
-    const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
-    const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
-
-  if (Builder.GetInsertBlock() == nullptr)
-    return;
-
-  bool isByRef = VD->hasAttr<BlocksAttr>();
-
-  uint64_t XOffset = 0;
-  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
-  llvm::DIType *Ty;
-  if (isByRef)
-    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
-  else
-    Ty = getOrCreateType(VD->getType(), Unit);
-
-  // Self is passed along as an implicit non-arg variable in a
-  // block. Mark it as the object pointer.
-  if (isa<ImplicitParamDecl>(VD) && VD->getName() == "self")
-    Ty = CreateSelfType(VD->getType(), Ty);
-
-  // Get location information.
-  unsigned Line = getLineNumber(VD->getLocation());
-  unsigned Column = getColumnNumber(VD->getLocation());
-
-  const llvm::DataLayout &target = CGM.getDataLayout();
-
-  CharUnits offset = CharUnits::fromQuantity(
-      target.getStructLayout(blockInfo.StructureType)
-          ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
-
-  SmallVector<int64_t, 9> addr;
-  if (isa<llvm::AllocaInst>(Storage))
-    addr.push_back(llvm::dwarf::DW_OP_deref);
-  addr.push_back(llvm::dwarf::DW_OP_plus);
-  addr.push_back(offset.getQuantity());
-  if (isByRef) {
-    addr.push_back(llvm::dwarf::DW_OP_deref);
-    addr.push_back(llvm::dwarf::DW_OP_plus);
-    // offset of __forwarding field
-    offset =
-        CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
-    addr.push_back(offset.getQuantity());
-    addr.push_back(llvm::dwarf::DW_OP_deref);
-    addr.push_back(llvm::dwarf::DW_OP_plus);
-    // offset of x field
-    offset = CGM.getContext().toCharUnitsFromBits(XOffset);
-    addr.push_back(offset.getQuantity());
-  }
-
-  // Create the descriptor for the variable.
-  auto *D = DBuilder.createAutoVariable(
-      cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
-      Line, Ty);
-
-  // Insert an llvm.dbg.declare into the current block.
-  auto DL = llvm::DebugLoc::get(Line, Column, LexicalBlockStack.back());
-  if (InsertPoint)
-    DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr), DL,
-                           InsertPoint);
-  else
-    DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr), DL,
-                           Builder.GetInsertBlock());
-}
-
-void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
-                                           unsigned ArgNo,
-                                           CGBuilderTy &Builder) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  EmitDeclare(VD, AI, ArgNo, Builder);
-}
-
 namespace {
 struct BlockLayoutChunk {
   uint64_t OffsetInBits;
   const BlockDecl::Capture *Capture;
 };
 bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
   return l.OffsetInBits < r.OffsetInBits;
 }
 }
 
-void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
-                                                       llvm::Value *Arg,
-                                                       unsigned ArgNo,
-                                                       llvm::Value *LocalAddr,
-                                                       CGBuilderTy &Builder) {
+void CGDebugDwarf::EmitDeclareOfBlockLiteralArgVariable(
+    const CGBlockInfo &block, llvm::Value *Arg, unsigned ArgNo,
+    llvm::Value *LocalAddr, CGBuilderTy &Builder) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   ASTContext &C = CGM.getContext();
   const BlockDecl *blockDecl = block.getBlockDecl();
 
   // Collect some general information about the block's location.
   SourceLocation loc = blockDecl->getCaretLocation();
   llvm::DIFile *tunit = getOrCreateFile(loc);
   unsigned line = getLineNumber(loc);
void CGDebugDwarf::EmitDeclareOfBlockLiteralArgVariable(
 
   // Insert an llvm.dbg.declare into the current block.
   DBuilder.insertDeclare(Arg, debugVar, DBuilder.createExpression(),
                          llvm::DebugLoc::get(line, column, scope),
                          Builder.GetInsertBlock());
 }
 
 llvm::DIDerivedType *
-CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
+CGDebugDwarf::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
   if (!D->isStaticDataMember())
     return nullptr;
 
   auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
   if (MI != StaticDataMemberCache.end()) {
     assert(MI->second && "Static data member declaration should still exist");
     return MI->second;
   }
 
   // If the member wasn't found in the cache, lazily construct and add it to the
   // type (used when a limited form of the type is emitted).
   auto DC = D->getDeclContext();
   auto *Ctxt = cast<llvm::DICompositeType>(getDeclContextDescriptor(D));
   return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
 }
 
-llvm::DIGlobalVariable *CGDebugInfo::CollectAnonRecordDecls(
+llvm::DIGlobalVariable *CGDebugDwarf::CollectAnonRecordDecls(
     const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
     StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
   llvm::DIGlobalVariable *GV = nullptr;
 
   for (const auto *Field : RD->fields()) {
     llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
     StringRef FieldName = Field->getName();
 
     // Ignore unnamed fields, but recurse into anonymous records.
     if (FieldName.empty()) {
       const RecordType *RT = dyn_cast<RecordType>(Field->getType());
       if (RT)
         GV = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
                                     Var, DContext);
       continue;
     }
     // Use VarDecl's Tag, Scope and Line number.
     GV = DBuilder.createGlobalVariable(DContext, FieldName, LinkageName, Unit,
                                        LineNo, FieldTy,
                                        Var->hasInternalLinkage(), Var, nullptr);
   }
   return GV;
 }
 
-void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
-                                     const VarDecl *D) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  // Create global variable debug descriptor.
-  llvm::DIFile *Unit = nullptr;
-  llvm::DIScope *DContext = nullptr;
-  unsigned LineNo;
-  StringRef DeclName, LinkageName;
-  QualType T;
-  collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName, DContext);
-
-  // Attempt to store one global variable for the declaration - even if we
-  // emit a lot of fields.
-  llvm::DIGlobalVariable *GV = nullptr;
-
-  // If this is an anonymous union then we'll want to emit a global
-  // variable for each member of the anonymous union so that it's possible
-  // to find the name of any field in the union.
-  if (T->isUnionType() && DeclName.empty()) {
-    const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
-    assert(RD->isAnonymousStructOrUnion() &&
-           "unnamed non-anonymous struct or union?");
-    GV = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
-  } else {
-    GV = DBuilder.createGlobalVariable(
-        DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
-        Var->hasInternalLinkage(), Var,
-        getOrCreateStaticDataMemberDeclarationOrNull(D));
-  }
-  DeclCache[D->getCanonicalDecl()].reset(static_cast<llvm::Metadata *>(GV));
-}
-
-void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
-                                     llvm::Constant *Init) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  // Create the descriptor for the variable.
-  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
-  StringRef Name = VD->getName();
-  llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);
-  if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(VD)) {
-    const EnumDecl *ED = cast<EnumDecl>(ECD->getDeclContext());
-    assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
-    Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
-  }
-  // Do not use global variables for enums.
-  //
-  // FIXME: why not?
-  if (Ty->getTag() == llvm::dwarf::DW_TAG_enumeration_type)
-    return;
-  // Do not emit separate definitions for function local const/statics.
-  if (isa<FunctionDecl>(VD->getDeclContext()))
-    return;
-  VD = cast<ValueDecl>(VD->getCanonicalDecl());
-  auto *VarD = cast<VarDecl>(VD);
-  if (VarD->isStaticDataMember()) {
-    auto *RD = cast<RecordDecl>(VarD->getDeclContext());
-    getDeclContextDescriptor(VarD);
-    // Ensure that the type is retained even though it's otherwise unreferenced.
-    RetainedTypes.push_back(
-        CGM.getContext().getRecordType(RD).getAsOpaquePtr());
-    return;
-  }
-
-  llvm::DIScope *DContext = getDeclContextDescriptor(VD);
-
-  auto &GV = DeclCache[VD];
-  if (GV)
-    return;
-  GV.reset(DBuilder.createGlobalVariable(
-      DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
-      true, Init, getOrCreateStaticDataMemberDeclarationOrNull(VarD)));
-}
-
-llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
-  if (!LexicalBlockStack.empty())
-    return LexicalBlockStack.back();
-  llvm::DIScope *Mod = getParentModuleOrNull(D);
-  return getContextDescriptor(D, Mod ? Mod : TheCU);
-}
-
-void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
+void CGDebugDwarf::EmitUsingDirective(const UsingDirectiveDecl &UD) {
   if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
     return;
   const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
   if (!NSDecl->isAnonymousNamespace() || 
       CGM.getCodeGenOpts().DebugExplicitImport) { 
     DBuilder.createImportedModule(
         getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
         getOrCreateNameSpace(NSDecl),
         getLineNumber(UD.getLocation()));
   }
 }
 
-void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
+void CGDebugDwarf::EmitUsingDecl(const UsingDecl &UD) {
   if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
     return;
   assert(UD.shadow_size() &&
          "We shouldn't be codegening an invalid UsingDecl containing no decls");
   // Emitting one decl is sufficient - debuggers can detect that this is an
   // overloaded name & provide lookup for all the overloads.
   const UsingShadowDecl &USD = **UD.shadow_begin();
   if (llvm::DINode *Target =
           getDeclarationOrDefinition(USD.getUnderlyingDecl()))
     DBuilder.createImportedDeclaration(
         getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
         getLineNumber(USD.getLocation()));
 }
 
-void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
+void CGDebugDwarf::EmitImportDecl(const ImportDecl &ID) {
   if (Module *M = ID.getImportedModule()) {
     auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
     DBuilder.createImportedDeclaration(
         getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
         getOrCreateModuleRef(Info, DebugTypeExtRefs),
         getLineNumber(ID.getLocation()));
   }
 }
 
 llvm::DIImportedEntity *
-CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
+CGDebugDwarf::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
   if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
     return nullptr;
   auto &VH = NamespaceAliasCache[&NA];
   if (VH)
     return cast<llvm::DIImportedEntity>(VH);
   llvm::DIImportedEntity *R;
   if (const NamespaceAliasDecl *Underlying =
           dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
     // This could cache & dedup here rather than relying on metadata deduping.
     R = DBuilder.createImportedDeclaration(
         getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
         EmitNamespaceAlias(*Underlying), getLineNumber(NA.getLocation()),
         NA.getName());
   else
     R = DBuilder.createImportedDeclaration(
         getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
         getOrCreateNameSpace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
         getLineNumber(NA.getLocation()), NA.getName());
   VH.reset(R);
   return R;
 }
 
 llvm::DINamespace *
-CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
+CGDebugDwarf::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
   NSDecl = NSDecl->getCanonicalDecl();
   auto I = NameSpaceCache.find(NSDecl);
   if (I != NameSpaceCache.end())
     return cast<llvm::DINamespace>(I->second);
 
   unsigned LineNo = getLineNumber(NSDecl->getLocation());
   llvm::DIFile *FileD = getOrCreateFile(NSDecl->getLocation());
   llvm::DIScope *Context = getDeclContextDescriptor(NSDecl);
   llvm::DINamespace *NS =
       DBuilder.createNameSpace(Context, NSDecl->getName(), FileD, LineNo);
   NameSpaceCache[NSDecl].reset(NS);
   return NS;
 }
 
-void CGDebugInfo::setDwoId(uint64_t Signature) {
+void CGDebugDwarf::setDwoId(uint64_t Signature) {
   assert(TheCU && "no main compile unit");
   TheCU->setDWOId(Signature);
 }
 
-
-void CGDebugInfo::finalize() {
+void CGDebugDwarf::finalize() {
   // Creating types might create further types - invalidating the current
   // element and the size(), so don't cache/reference them.
   for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
     ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
     llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
                            ? CreateTypeDefinition(E.Type, E.Unit)
                            : E.Decl;
     DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
   }
 
   for (auto p : ReplaceMap) {
     assert(p.second);
     auto *Ty = cast<llvm::DIType>(p.second);
     assert(Ty->isForwardDecl());
 
     auto it = TypeCache.find(p.first);
     assert(it != TypeCache.end());
     assert(it->second);
 
     DBuilder.replaceTemporary(llvm::TempDIType(Ty),
                               cast<llvm::DIType>(it->second));
   }
 
-  for (const auto &p : FwdDeclReplaceMap) {
-    assert(p.second);
-    llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(p.second));
-    llvm::Metadata *Repl;
-
-    auto it = DeclCache.find(p.first);
-    // If there has been no definition for the declaration, call RAUW
-    // with ourselves, that will destroy the temporary MDNode and
-    // replace it with a standard one, avoiding leaking memory.
-    if (it == DeclCache.end())
-      Repl = p.second;
-    else
-      Repl = it->second;
-
-    DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
-  }
-
   // We keep our own list of retained types, because we need to look
   // up the final type in the type cache.
   for (auto &RT : RetainedTypes)
     if (auto MD = TypeCache[RT])
       DBuilder.retainType(cast<llvm::DIType>(MD));
 
-  DBuilder.finalize();
+  // Do format-neutral finalization.
+  CGDebugInfo::finalize();
 }
 
-void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
+void CGDebugDwarf::EmitExplicitCastType(QualType Ty) {
   if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
     return;
 
   if (auto *DieTy = getOrCreateType(Ty, getOrCreateMainFile()))
     // Don't ignore in case of explicit cast where it is referenced indirectly.
     DBuilder.retainType(DieTy);
 }

lib/CodeGen/CGDebugInfo.h

 #include "clang/Frontend/CodeGenOptions.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/IR/DIBuilder.h"
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/ValueHandle.h"
 #include "llvm/Support/Allocator.h"
 
-namespace llvm {
-class MDNode;
-}
-
 namespace clang {
 class CXXMethodDecl;
 class ClassTemplateSpecializationDecl;
 class GlobalDecl;
 class ModuleMap;
 class ObjCInterfaceDecl;
 class ObjCIvarDecl;
 class UsingDecl;
 class VarDecl;
 
 namespace CodeGen {
 class CodeGenModule;
 class CodeGenFunction;
 class CGBlockInfo;
 
 /// This class gathers all debug information during compilation and is
 /// responsible for emitting to llvm globals or pass directly to the
 /// backend.
 class CGDebugInfo {
   friend class ApplyDebugLocation;
   friend class SaveAndRestoreLocation;
+protected:
   CodeGenModule &CGM;
   const codegenoptions::DebugInfoKind DebugKind;
-  bool DebugTypeExtRefs;
   llvm::DIBuilder DBuilder;
   llvm::DICompileUnit *TheCU = nullptr;
   ModuleMap *ClangModuleMap = nullptr;
   ExternalASTSource::ASTSourceDescriptor PCHDescriptor;
-  SourceLocation CurLoc;
-  llvm::DIType *VTablePtrType = nullptr;
-  llvm::DIType *ClassTy = nullptr;
-  llvm::DICompositeType *ObjTy = nullptr;
-  llvm::DIType *SelTy = nullptr;
-#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
-  llvm::DIType *SingletonId = nullptr;
-#include "clang/AST/OpenCLImageTypes.def"
-  llvm::DIType *OCLEventDITy = nullptr;
-  llvm::DIType *OCLClkEventDITy = nullptr;
-  llvm::DIType *OCLQueueDITy = nullptr;
-  llvm::DIType *OCLNDRangeDITy = nullptr;
-  llvm::DIType *OCLReserveIDDITy = nullptr;
 
-  /// Cache of previously constructed Types.
-  llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
+  /// Current source location. Controlled by ApplyDebugLocation.
+  SourceLocation CurLoc;
 
   llvm::SmallDenseMap<llvm::StringRef, llvm::StringRef> DebugPrefixMap;
 
-  struct ObjCInterfaceCacheEntry {
-    const ObjCInterfaceType *Type;
-    llvm::DIType *Decl;
-    llvm::DIFile *Unit;
-    ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl,
-                            llvm::DIFile *Unit)
-        : Type(Type), Decl(Decl), Unit(Unit) {}
-  };
-
-  /// Cache of previously constructed interfaces which may change.
-  llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
-
-  /// Cache of references to clang modules and precompiled headers.
-  llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache;
-
-  /// List of interfaces we want to keep even if orphaned.
-  std::vector<void *> RetainedTypes;
-
-  /// Cache of forward declared types to RAUW at the end of
-  /// compilation.
-  std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
-
   /// Cache of replaceable forward declarations (functions and
   /// variables) to RAUW at the end of compilation.
   std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
       FwdDeclReplaceMap;
 
   /// Keep track of our current nested lexical block.
   std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
   llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
   /// Keep track of LexicalBlockStack counter at the beginning of a
   /// function. This is used to pop unbalanced regions at the end of a
   /// function.
   std::vector<unsigned> FnBeginRegionCount;
 
   /// This is a storage for names that are constructed on demand. For
   /// example, C++ destructors, C++ operators etc..
   llvm::BumpPtrAllocator DebugInfoNames;
   StringRef CWDName;
 
   llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
   llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
   /// Cache declarations relevant to DW_TAG_imported_declarations (C++
   /// using declarations) that aren't covered by other more specific caches.
   llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
-  llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NameSpaceCache;
-  llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
-      NamespaceAliasCache;
-  llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>>
-      StaticDataMemberCache;
-
-  /// Helper functions for getOrCreateType.
-  /// @{
-  /// Currently the checksum of an interface includes the number of
-  /// ivars and property accessors.
-  llvm::DIType *CreateType(const BuiltinType *Ty);
-  llvm::DIType *CreateType(const ComplexType *Ty);
-  llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg);
-  llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg);
-  llvm::DIType *CreateType(const TemplateSpecializationType *Ty,
-                           llvm::DIFile *Fg);
-  llvm::DIType *CreateType(const ObjCObjectPointerType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F);
-  /// Get structure or union type.
-  llvm::DIType *CreateType(const RecordType *Tyg);
-  llvm::DIType *CreateTypeDefinition(const RecordType *Ty);
-  llvm::DICompositeType *CreateLimitedType(const RecordType *Ty);
-  void CollectContainingType(const CXXRecordDecl *RD,
-                             llvm::DICompositeType *CT);
-  /// Get Objective-C interface type.
-  llvm::DIType *CreateType(const ObjCInterfaceType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateTypeDefinition(const ObjCInterfaceType *Ty,
-                                     llvm::DIFile *F);
-  /// Get Objective-C object type.
-  llvm::DIType *CreateType(const ObjCObjectType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const VectorType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const ArrayType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const LValueReferenceType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const RValueReferenceType *Ty, llvm::DIFile *Unit);
-  llvm::DIType *CreateType(const MemberPointerType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const AtomicType *Ty, llvm::DIFile *F);
-  llvm::DIType *CreateType(const PipeType *Ty, llvm::DIFile *F);
-  /// Get enumeration type.
-  llvm::DIType *CreateEnumType(const EnumType *Ty);
-  llvm::DIType *CreateTypeDefinition(const EnumType *Ty);
-  /// Look up the completed type for a self pointer in the TypeCache and
-  /// create a copy of it with the ObjectPointer and Artificial flags
-  /// set. If the type is not cached, a new one is created. This should
-  /// never happen though, since creating a type for the implicit self
-  /// argument implies that we already parsed the interface definition
-  /// and the ivar declarations in the implementation.
-  llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty);
-  /// @}
-
-  /// Get the type from the cache or return null type if it doesn't
-  /// exist.
-  llvm::DIType *getTypeOrNull(const QualType);
-  /// Return the debug type for a C++ method.
-  /// \arg CXXMethodDecl is of FunctionType. This function type is
-  /// not updated to include implicit \c this pointer. Use this routine
-  /// to get a method type which includes \c this pointer.
-  llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
-                                                llvm::DIFile *F);
-  llvm::DISubroutineType *
-  getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
-                                llvm::DIFile *Unit);
-  llvm::DISubroutineType *
-  getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F);
-  /// \return debug info descriptor for vtable.
-  llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F);
-  /// \return namespace descriptor for the given namespace decl.
-  llvm::DINamespace *getOrCreateNameSpace(const NamespaceDecl *N);
-  llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty,
-                                      QualType PointeeTy, llvm::DIFile *F);
-  llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache);
-
-  /// A helper function to create a subprogram for a single member
-  /// function GlobalDecl.
-  llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method,
-                                              llvm::DIFile *F,
-                                              llvm::DIType *RecordTy);
-
-  /// A helper function to collect debug info for C++ member
-  /// functions. This is used while creating debug info entry for a
-  /// Record.
-  void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F,
-                                 SmallVectorImpl<llvm::Metadata *> &E,
-                                 llvm::DIType *T);
-
-  /// A helper function to collect debug info for C++ base
-  /// classes. This is used while creating debug info entry for a
-  /// Record.
-  void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F,
-                       SmallVectorImpl<llvm::Metadata *> &EltTys,
-                       llvm::DIType *RecordTy);
-
-  /// A helper function to collect template parameters.
-  llvm::DINodeArray CollectTemplateParams(const TemplateParameterList *TPList,
-                                          ArrayRef<TemplateArgument> TAList,
-                                          llvm::DIFile *Unit);
-  /// A helper function to collect debug info for function template
-  /// parameters.
-  llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD,
-                                                  llvm::DIFile *Unit);
-
-  /// A helper function to collect debug info for template
-  /// parameters.
-  llvm::DINodeArray
-  CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
-                           llvm::DIFile *F);
-
-  llvm::DIType *createFieldType(StringRef name, QualType type,
-                                uint64_t sizeInBitsOverride, SourceLocation loc,
-                                AccessSpecifier AS, uint64_t offsetInBits,
-                                llvm::DIFile *tunit, llvm::DIScope *scope,
-                                const RecordDecl *RD = nullptr);
-
-  /// Helpers for collecting fields of a record.
-  /// @{
-  void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
-                                 SmallVectorImpl<llvm::Metadata *> &E,
-                                 llvm::DIType *RecordTy);
-  llvm::DIDerivedType *CreateRecordStaticField(const VarDecl *Var,
-                                               llvm::DIType *RecordTy,
-                                               const RecordDecl *RD);
-  void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
-                                llvm::DIFile *F,
-                                SmallVectorImpl<llvm::Metadata *> &E,
-                                llvm::DIType *RecordTy, const RecordDecl *RD);
-  void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F,
-                           SmallVectorImpl<llvm::Metadata *> &E,
-                           llvm::DICompositeType *RecordTy);
-
-  /// If the C++ class has vtable info then insert appropriate debug
-  /// info entry in EltTys vector.
-  void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F,
-                         SmallVectorImpl<llvm::Metadata *> &EltTys);
-  /// @}
-
-  /// Create a new lexical block node and push it on the stack.
-  void CreateLexicalBlock(SourceLocation Loc);
 
 public:
   CGDebugInfo(CodeGenModule &CGM);
-  ~CGDebugInfo();
+  virtual ~CGDebugInfo();
 
-  void finalize();
+  virtual void finalize();
 
   /// Module debugging: Support for building PCMs.
   /// @{
   /// Set the main CU's DwoId field to \p Signature.
-  void setDwoId(uint64_t Signature);
+  virtual void setDwoId(uint64_t Signature) = 0;
 
   /// When generating debug information for a clang module or
   /// precompiled header, this module map will be used to determine
   /// the module of origin of each Decl.
   void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; }
 
   /// When generating debug information for a clang module or
   /// precompiled header, this module map will be used to determine
public:
 
   /// Emit call to \c llvm.dbg.declare for an argument variable
   /// declaration.
   void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
                                 unsigned ArgNo, CGBuilderTy &Builder);
 
   /// Emit call to \c llvm.dbg.declare for the block-literal argument
   /// to a block invocation function.
-  void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
-                                            llvm::Value *Arg, unsigned ArgNo,
+  virtual void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
+                                                    llvm::Value *Arg,
+                                                    unsigned ArgNo,
                                                     llvm::Value *LocalAddr,
-                                            CGBuilderTy &Builder);
+                                                    CGBuilderTy &Builder) = 0;
 
   /// Emit information about a global variable.
   void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
 
   /// Emit global variable's debug info.
   void EmitGlobalVariable(const ValueDecl *VD, llvm::Constant *Init);
 
   /// Emit C++ using directive.
-  void EmitUsingDirective(const UsingDirectiveDecl &UD);
+  virtual void EmitUsingDirective(const UsingDirectiveDecl &UD) = 0;
 
   /// Emit the type explicitly casted to.
-  void EmitExplicitCastType(QualType Ty);
+  virtual void EmitExplicitCastType(QualType Ty) = 0;
 
   /// Emit C++ using declaration.
-  void EmitUsingDecl(const UsingDecl &UD);
+  virtual void EmitUsingDecl(const UsingDecl &UD) = 0;
 
   /// Emit an @import declaration.
-  void EmitImportDecl(const ImportDecl &ID);
+  virtual void EmitImportDecl(const ImportDecl &ID) = 0;
 
   /// Emit C++ namespace alias.
-  llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA);
+  virtual llvm::DIImportedEntity *
+  EmitNamespaceAlias(const NamespaceAliasDecl &NA) = 0;
 
   /// Emit record type's standalone debug info.
-  llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L);
+  virtual llvm::DIType *getOrCreateRecordType(QualType Ty,
+                                              SourceLocation L) = 0;
 
   /// Emit an Objective-C interface type standalone debug info.
-  llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);
+  virtual llvm::DIType *getOrCreateInterfaceType(QualType Ty,
+                                                 SourceLocation Loc) = 0;
 
   /// Emit standalone debug info for a type.
-  llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc);
-
-  void completeType(const EnumDecl *ED);
-  void completeType(const RecordDecl *RD);
-  void completeRequiredType(const RecordDecl *RD);
-  void completeClassData(const RecordDecl *RD);
+  virtual llvm::DIType *getOrCreateStandaloneType(QualType Ty,
+                                                  SourceLocation Loc) = 0;
 
-  void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
+  virtual void completeType(const EnumDecl *ED) = 0;
+  virtual void completeType(const RecordDecl *RD) = 0;
+  virtual void completeRequiredType(const RecordDecl *RD) = 0;
+  virtual void completeClassData(const RecordDecl *RD) = 0;
 
-private:
-  /// Emit call to llvm.dbg.declare for a variable declaration.
-  void EmitDeclare(const VarDecl *decl, llvm::Value *AI,
-                   llvm::Optional<unsigned> ArgNo, CGBuilderTy &Builder);
-
-  /// Build up structure info for the byref.  See \a BuildByRefType.
-  llvm::DIType *EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
-                                             uint64_t *OffSet);
-
-  /// Get context info for the DeclContext of \p Decl.
-  llvm::DIScope *getDeclContextDescriptor(const Decl *D);
-  /// Get context info for a given DeclContext \p Decl.
-  llvm::DIScope *getContextDescriptor(const Decl *Context,
-                                      llvm::DIScope *Default);
-
-  llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);
-
-  /// Create a forward decl for a RecordType in a given context.
-  llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
-                                                  llvm::DIScope *);
+  virtual void
+  completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD) = 0;
 
+protected:
   /// Return current directory name.
   StringRef getCurrentDirname();
 
-  /// Create new compile unit.
-  void CreateCompileUnit();
-
   /// Remap a given path with the current debug prefix map
   std::string remapDIPath(StringRef) const;
 
   /// Get the file debug info descriptor for the input location.
   llvm::DIFile *getOrCreateFile(SourceLocation Loc);
 
   /// Get the file info for main compile unit.
   llvm::DIFile *getOrCreateMainFile();
 
-  /// Get the type from the cache or create a new type if necessary.
-  llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg);
-
-  /// Get a reference to a clang module.  If \p CreateSkeletonCU is true,
-  /// this also creates a split dwarf skeleton compile unit.
-  llvm::DIModule *
-  getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
-                       bool CreateSkeletonCU);
-
-  /// DebugTypeExtRefs: If \p D originated in a clang module, return it.
-  llvm::DIModule *getParentModuleOrNull(const Decl *D);
-
-  /// Get the type from the cache or create a new partial type if
-  /// necessary.
-  llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty,
-                                                llvm::DIFile *F);
-
-  /// Create type metadata for a source language type.
-  llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg);
-
-  /// Create new member and increase Offset by FType's size.
-  llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType,
-                                 StringRef Name, uint64_t *Offset);
-
-  /// Retrieve the DIDescriptor, if any, for the canonical form of this
-  /// declaration.
-  llvm::DINode *getDeclarationOrDefinition(const Decl *D);
-
-  /// \return debug info descriptor to describe method
-  /// declaration for the given method definition.
-  llvm::DISubprogram *getFunctionDeclaration(const Decl *D);
-
-  /// \return debug info descriptor to describe in-class static data
-  /// member declaration for the given out-of-class definition.  If D
-  /// is an out-of-class definition of a static data member of a
-  /// class, find its corresponding in-class declaration.
-  llvm::DIDerivedType *
-  getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
+  /// Get line number for the location. If location is invalid
+  /// then use current location.
+  unsigned getLineNumber(SourceLocation Loc);
 
-  /// Create a subprogram describing the forward declaration
-  /// represented in the given FunctionDecl.
-  llvm::DISubprogram *getFunctionForwardDeclaration(const FunctionDecl *FD);
+  /// Get column number for the location. If location is
+  /// invalid then use current location.
+  /// \param Force  Assume DebugColumnInfo option is true.
+  unsigned getColumnNumber(SourceLocation Loc, bool Force = false);
 
-  /// Create a global variable describing the forward decalration
-  /// represented in the given VarDecl.
-  llvm::DIGlobalVariable *
-  getGlobalVariableForwardDeclaration(const VarDecl *VD);
+  /// Get context info for the DeclContext of \p Decl.
+  llvm::DIScope *getDeclContextDescriptor(const Decl *D);
+  /// Get context info for a given DeclContext \p Decl.
+  llvm::DIScope *getContextDescriptor(const Decl *Context,
+                                      llvm::DIScope *Default);
 
-  /// \brief Return a global variable that represents one of the
-  /// collection of global variables created for an anonmyous union.
-  ///
-  /// Recursively collect all of the member fields of a global
-  /// anonymous decl and create static variables for them. The first
-  /// time this is called it needs to be on a union and then from
-  /// there we can have additional unnamed fields.
-  llvm::DIGlobalVariable *
-  CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
-                         unsigned LineNo, StringRef LinkageName,
-                         llvm::GlobalVariable *Var, llvm::DIScope *DContext);
+  llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);
 
   /// Get function name for the given FunctionDecl. If the name is
   /// constructed on demand (e.g., C++ destructor) then the name is
   /// stored on the side.
   StringRef getFunctionName(const FunctionDecl *FD);
 
   /// Returns the unmangled name of an Objective-C method.
   /// This is the display name for the debugging info.
   StringRef getObjCMethodName(const ObjCMethodDecl *FD);
 
   /// Return selector name. This is used for debugging
   /// info.
   StringRef getSelectorName(Selector S);
 
   /// Get class name including template argument list.
   StringRef getClassName(const RecordDecl *RD);
 
   /// Get the vtable name for the given class.
   StringRef getVTableName(const CXXRecordDecl *Decl);
 
-  /// Get line number for the location. If location is invalid
-  /// then use current location.
-  unsigned getLineNumber(SourceLocation Loc);
+  /// Retrieve the DIDescriptor, if any, for the canonical form of this
+  /// declaration.
+  llvm::DINode *getDeclarationOrDefinition(const Decl *D);
 
-  /// Get column number for the location. If location is
-  /// invalid then use current location.
-  /// \param Force  Assume DebugColumnInfo option is true.
-  unsigned getColumnNumber(SourceLocation Loc, bool Force = false);
+  /// \return debug info descriptor to describe method
+  /// declaration for the given method definition.
+  llvm::DISubprogram *getFunctionDeclaration(const Decl *D);
+
+  /// Create a subprogram describing the forward declaration
+  /// represented in the given FunctionDecl.
+  llvm::DISubprogram *getFunctionForwardDeclaration(const FunctionDecl *FD);
+
+  /// Create a global variable describing the forward decalration
+  /// represented in the given VarDecl.
+  llvm::DIGlobalVariable *
+  getGlobalVariableForwardDeclaration(const VarDecl *VD);
 
   /// Collect various properties of a FunctionDecl.
   /// \param GD  A GlobalDecl whose getDecl() must return a FunctionDecl.
   void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
                                 StringRef &Name, StringRef &LinkageName,
                                 llvm::DIScope *&FDContext,
                                 llvm::DINodeArray &TParamsArray,
                                 unsigned &Flags);
 
   /// Collect various properties of a VarDecl.
   void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
                            unsigned &LineNo, QualType &T, StringRef &Name,
                            StringRef &LinkageName, llvm::DIScope *&VDContext);
 
+private:
+  /// Format-specific "type" creation methods.
+  /// @{
+
+  /// Get the type from the cache or create a new type if necessary.
+  virtual llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg) = 0;
+
+  virtual llvm::DISubroutineType *
+  getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F) = 0;
+
+  /// Look up the completed type for a self pointer in the TypeCache and
+  /// create a copy of it with the ObjectPointer and Artificial flags
+  /// set. If the type is not cached, a new one is created. This should
+  /// never happen though, since creating a type for the implicit self
+  /// argument implies that we already parsed the interface definition
+  /// and the ivar declarations in the implementation.
+  virtual llvm::DIType *CreateSelfType(const QualType &QualTy,
+                                       llvm::DIType *Ty) = 0;
+
+  /// A helper function to create a subprogram for a single member
+  /// function GlobalDecl.
+  virtual llvm::DISubprogram *
+  CreateCXXMemberFunction(const CXXMethodDecl *Method, llvm::DIFile *F,
+                          llvm::DIType *RecordTy) = 0;
+
+  /// DebugTypeExtRefs: If \p D originated in a clang module, return it.
+  virtual llvm::DIModule *getParentModuleOrNull(const Decl *D) = 0;
+
+  /// \return namespace descriptor for the given namespace decl.
+  virtual llvm::DINamespace *getOrCreateNameSpace(const NamespaceDecl *N) = 0;
+
+  /// A helper function to collect debug info for function template
+  /// parameters.
+  virtual llvm::DINodeArray
+  CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile *Unit) = 0;
+
+  /// \brief Return a global variable that represents one of the
+  /// collection of global variables created for an anonmyous union.
+  ///
+  /// Recursively collect all of the member fields of a global
+  /// anonymous decl and create static variables for them. The first
+  /// time this is called it needs to be on a union and then from
+  /// there we can have additional unnamed fields.
+  virtual llvm::DIGlobalVariable *
+  CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
+                         unsigned LineNo, StringRef LinkageName,
+                         llvm::GlobalVariable *Var,
+                         llvm::DIScope *DContext) = 0;
+
+  /// \return debug info descriptor to describe in-class static data
+  /// member declaration for the given out-of-class definition.  If D
+  /// is an out-of-class definition of a static data member of a
+  /// class, find its corresponding in-class declaration.
+  virtual llvm::DIDerivedType *
+  getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) = 0;
+
+  /// Build up structure info for the byref.  See \a BuildByRefType.
+  virtual llvm::DIType *EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
+                                                     uint64_t *OffSet) = 0;
+
+  virtual void retainType(void *OpaqueDecl) {};
+
+  /// @}
+
+private:
+  /// Create new compile unit.
+  void CreateCompileUnit();
+
+  /// Create a new lexical block node and push it on the stack.
+  void CreateLexicalBlock(SourceLocation Loc);
+
+  /// Emit call to llvm.dbg.declare for a variable declaration.
+  void EmitDeclare(const VarDecl *decl, llvm::Value *AI,
+                   llvm::Optional<unsigned> ArgNo, CGBuilderTy &Builder);
+
   /// Allocate a copy of \p A using the DebugInfoNames allocator
   /// and return a reference to it. If multiple arguments are given the strings
   /// are concatenated.
   StringRef internString(StringRef A, StringRef B = StringRef()) {
     char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
     if (!A.empty())
       std::memcpy(Data, A.data(), A.size());
     if (!B.empty())

lib/CodeGen/CGDebugInfo.cpp

 //===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This coordinates the debug information generation while generating code.
 //
 //===----------------------------------------------------------------------===//
 
 #include "CGDebugInfo.h"
 #include "CGBlocks.h"
-#include "CGCXXABI.h"
-#include "CGObjCRuntime.h"
 #include "CodeGenFunction.h"
 #include "CodeGenModule.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclFriend.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/Expr.h"
-#include "clang/AST/RecordLayout.h"
-#include "clang/Basic/FileManager.h"
-#include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Version.h"
-#include "clang/Frontend/CodeGenOptions.h"
-#include "clang/Lex/HeaderSearchOptions.h"
-#include "clang/Lex/ModuleMap.h"
-#include "clang/Lex/PreprocessorOptions.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Intrinsics.h"
-#include "llvm/IR/Module.h"
+#include "llvm/IR/DIBuilder.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
+
 using namespace clang;
 using namespace clang::CodeGen;
 
 CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
     : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
-      DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
       DBuilder(CGM.getModule()) {
   for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
     DebugPrefixMap[KV.first] = KV.second;
   CreateCompileUnit();
 }
 
 CGDebugInfo::~CGDebugInfo() {
   assert(LexicalBlockStack.empty() &&
void CGDebugInfo::CreateCompileUnit() {
   // Create new compile unit.
   // FIXME - Eliminate TheCU.
   TheCU = DBuilder.createCompileUnit(
       LangTag, remapDIPath(MainFileName), remapDIPath(getCurrentDirname()),
       Producer, LO.Optimize, CGM.getCodeGenOpts().DwarfDebugFlags, RuntimeVers,
       CGM.getCodeGenOpts().SplitDwarfFile, EmissionKind, 0 /* DWOid */);
 }
 
-llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
-  llvm::dwarf::TypeKind Encoding;
-  StringRef BTName;
-  switch (BT->getKind()) {
-#define BUILTIN_TYPE(Id, SingletonId)
-#define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
-#include "clang/AST/BuiltinTypes.def"
-  case BuiltinType::Dependent:
-    llvm_unreachable("Unexpected builtin type");
-  case BuiltinType::NullPtr:
-    return DBuilder.createNullPtrType();
-  case BuiltinType::Void:
-    return nullptr;
-  case BuiltinType::ObjCClass:
-    if (!ClassTy)
-      ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
-                                           "objc_class", TheCU,
-                                           getOrCreateMainFile(), 0);
-    return ClassTy;
-  case BuiltinType::ObjCId: {
-    // typedef struct objc_class *Class;
-    // typedef struct objc_object {
-    //  Class isa;
-    // } *id;
-
-    if (ObjTy)
-      return ObjTy;
-
-    if (!ClassTy)
-      ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
-                                           "objc_class", TheCU,
-                                           getOrCreateMainFile(), 0);
-
-    unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
-
-    auto *ISATy = DBuilder.createPointerType(ClassTy, Size);
-
-    ObjTy =
-        DBuilder.createStructType(TheCU, "objc_object", getOrCreateMainFile(),
-                                  0, 0, 0, 0, nullptr, llvm::DINodeArray());
-
-    DBuilder.replaceArrays(
-        ObjTy,
-        DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
-            ObjTy, "isa", getOrCreateMainFile(), 0, Size, 0, 0, 0, ISATy)));
-    return ObjTy;
-  }
-  case BuiltinType::ObjCSel: {
-    if (!SelTy)
-      SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
-                                         "objc_selector", TheCU,
-                                         getOrCreateMainFile(), 0);
-    return SelTy;
-  }
-
-#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
-  case BuiltinType::Id: \
-    return getOrCreateStructPtrType("opencl_" #ImgType "_" #Suffix "_t", \
-                                    SingletonId);
-#include "clang/AST/OpenCLImageTypes.def"
-  case BuiltinType::OCLSampler:
-    return DBuilder.createBasicType(
-        "opencl_sampler_t", CGM.getContext().getTypeSize(BT),
-        CGM.getContext().getTypeAlign(BT), llvm::dwarf::DW_ATE_unsigned);
-  case BuiltinType::OCLEvent:
-    return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
-  case BuiltinType::OCLClkEvent:
-    return getOrCreateStructPtrType("opencl_clk_event_t", OCLClkEventDITy);
-  case BuiltinType::OCLQueue:
-    return getOrCreateStructPtrType("opencl_queue_t", OCLQueueDITy);
-  case BuiltinType::OCLNDRange:
-    return getOrCreateStructPtrType("opencl_ndrange_t", OCLNDRangeDITy);
-  case BuiltinType::OCLReserveID:
-    return getOrCreateStructPtrType("opencl_reserve_id_t", OCLReserveIDDITy);
-
-  case BuiltinType::UChar:
-  case BuiltinType::Char_U:
-    Encoding = llvm::dwarf::DW_ATE_unsigned_char;
-    break;
-  case BuiltinType::Char_S:
-  case BuiltinType::SChar:
-    Encoding = llvm::dwarf::DW_ATE_signed_char;
-    break;
-  case BuiltinType::Char16:
-  case BuiltinType::Char32:
-    Encoding = llvm::dwarf::DW_ATE_UTF;
-    break;
-  case BuiltinType::UShort:
-  case BuiltinType::UInt:
-  case BuiltinType::UInt128:
-  case BuiltinType::ULong:
-  case BuiltinType::WChar_U:
-  case BuiltinType::ULongLong:
-    Encoding = llvm::dwarf::DW_ATE_unsigned;
-    break;
-  case BuiltinType::Short:
-  case BuiltinType::Int:
-  case BuiltinType::Int128:
-  case BuiltinType::Long:
-  case BuiltinType::WChar_S:
-  case BuiltinType::LongLong:
-    Encoding = llvm::dwarf::DW_ATE_signed;
-    break;
-  case BuiltinType::Bool:
-    Encoding = llvm::dwarf::DW_ATE_boolean;
-    break;
-  case BuiltinType::Half:
-  case BuiltinType::Float:
-  case BuiltinType::LongDouble:
-  case BuiltinType::Double:
-    Encoding = llvm::dwarf::DW_ATE_float;
-    break;
-  }
-
-  switch (BT->getKind()) {
-  case BuiltinType::Long:
-    BTName = "long int";
-    break;
-  case BuiltinType::LongLong:
-    BTName = "long long int";
-    break;
-  case BuiltinType::ULong:
-    BTName = "long unsigned int";
-    break;
-  case BuiltinType::ULongLong:
-    BTName = "long long unsigned int";
-    break;
-  default:
-    BTName = BT->getName(CGM.getLangOpts());
-    break;
-  }
-  // Bit size, align and offset of the type.
-  uint64_t Size = CGM.getContext().getTypeSize(BT);
-  uint64_t Align = CGM.getContext().getTypeAlign(BT);
-  return DBuilder.createBasicType(BTName, Size, Align, Encoding);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
-  // Bit size, align and offset of the type.
-  llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
-  if (Ty->isComplexIntegerType())
-    Encoding = llvm::dwarf::DW_ATE_lo_user;
-
-  uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
-  return DBuilder.createBasicType("complex", Size, Align, Encoding);
-}
-
-llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
-                                               llvm::DIFile *Unit) {
-  QualifierCollector Qc;
-  const Type *T = Qc.strip(Ty);
-
-  // Ignore these qualifiers for now.
-  Qc.removeObjCGCAttr();
-  Qc.removeAddressSpace();
-  Qc.removeObjCLifetime();
-
-  // We will create one Derived type for one qualifier and recurse to handle any
-  // additional ones.
-  llvm::dwarf::Tag Tag;
-  if (Qc.hasConst()) {
-    Tag = llvm::dwarf::DW_TAG_const_type;
-    Qc.removeConst();
-  } else if (Qc.hasVolatile()) {
-    Tag = llvm::dwarf::DW_TAG_volatile_type;
-    Qc.removeVolatile();
-  } else if (Qc.hasRestrict()) {
-    Tag = llvm::dwarf::DW_TAG_restrict_type;
-    Qc.removeRestrict();
-  } else {
-    assert(Qc.empty() && "Unknown type qualifier for debug info");
-    return getOrCreateType(QualType(T, 0), Unit);
-  }
-
-  auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
-
-  // No need to fill in the Name, Line, Size, Alignment, Offset in case of
-  // CVR derived types.
-  return DBuilder.createQualifiedType(Tag, FromTy);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
-                                      llvm::DIFile *Unit) {
-
-  // The frontend treats 'id' as a typedef to an ObjCObjectType,
-  // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
-  // debug info, we want to emit 'id' in both cases.
-  if (Ty->isObjCQualifiedIdType())
-    return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
-
-  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
-                               Ty->getPointeeType(), Unit);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
-                                      llvm::DIFile *Unit) {
-  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
-                               Ty->getPointeeType(), Unit);
-}
-
-/// \return whether a C++ mangling exists for the type defined by TD.
-static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
-  switch (TheCU->getSourceLanguage()) {
-  case llvm::dwarf::DW_LANG_C_plus_plus:
-    return true;
-  case llvm::dwarf::DW_LANG_ObjC_plus_plus:
-    return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
-  default:
-    return false;
-  }
-}
-
-/// In C++ mode, types have linkage, so we can rely on the ODR and
-/// on their mangled names, if they're external.
-static SmallString<256> getUniqueTagTypeName(const TagType *Ty,
-                                             CodeGenModule &CGM,
-                                             llvm::DICompileUnit *TheCU) {
-  SmallString<256> FullName;
-  const TagDecl *TD = Ty->getDecl();
-
-  if (!hasCXXMangling(TD, TheCU) || !TD->isExternallyVisible())
-    return FullName;
-
-  // Microsoft Mangler does not have support for mangleCXXRTTIName yet.
-  if (CGM.getTarget().getCXXABI().isMicrosoft())
-    return FullName;
-
-  // TODO: This is using the RTTI name. Is there a better way to get
-  // a unique string for a type?
-  llvm::raw_svector_ostream Out(FullName);
-  CGM.getCXXABI().getMangleContext().mangleCXXRTTIName(QualType(Ty, 0), Out);
-  return FullName;
-}
-
-/// \return the approproate DWARF tag for a composite type.
-static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD) {
-   llvm::dwarf::Tag Tag;
-  if (RD->isStruct() || RD->isInterface())
-    Tag = llvm::dwarf::DW_TAG_structure_type;
-  else if (RD->isUnion())
-    Tag = llvm::dwarf::DW_TAG_union_type;
-  else {
-    // FIXME: This could be a struct type giving a default visibility different
-    // than C++ class type, but needs llvm metadata changes first.
-    assert(RD->isClass());
-    Tag = llvm::dwarf::DW_TAG_class_type;
-  }
-  return Tag;
-}
-
-llvm::DICompositeType *
-CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
-                                      llvm::DIScope *Ctx) {
-  const RecordDecl *RD = Ty->getDecl();
-  if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
-    return cast<llvm::DICompositeType>(T);
-  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
-  unsigned Line = getLineNumber(RD->getLocation());
-  StringRef RDName = getClassName(RD);
-
-  uint64_t Size = 0;
-  uint64_t Align = 0;
-
-  const RecordDecl *D = RD->getDefinition();
-  if (D && D->isCompleteDefinition()) {
-    Size = CGM.getContext().getTypeSize(Ty);
-    Align = CGM.getContext().getTypeAlign(Ty);
-  }
-
-  // Create the type.
-  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
-  llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
-      getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
-      llvm::DINode::FlagFwdDecl, FullName);
-  ReplaceMap.emplace_back(
-      std::piecewise_construct, std::make_tuple(Ty),
-      std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
-  return RetTy;
-}
-
-llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
-                                                 const Type *Ty,
-                                                 QualType PointeeTy,
-                                                 llvm::DIFile *Unit) {
-  // Bit size, align and offset of the type.
-  // Size is always the size of a pointer. We can't use getTypeSize here
-  // because that does not return the correct value for references.
-  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
-  uint64_t Size = CGM.getTarget().getPointerWidth(AS);
-  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
-
-  if (Tag == llvm::dwarf::DW_TAG_reference_type ||
-      Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
-    return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
-                                        Size, Align);
-  else
-    return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
-                                      Align);
-}
-
-llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
-                                                    llvm::DIType *&Cache) {
-  if (Cache)
-    return Cache;
-  Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
-                                     TheCU, getOrCreateMainFile(), 0);
-  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
-  Cache = DBuilder.createPointerType(Cache, Size);
-  return Cache;
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
-                                      llvm::DIFile *Unit) {
-  SmallVector<llvm::Metadata *, 8> EltTys;
-  QualType FType;
-  uint64_t FieldSize, FieldOffset;
-  unsigned FieldAlign;
-  llvm::DINodeArray Elements;
-
-  FieldOffset = 0;
-  FType = CGM.getContext().UnsignedLongTy;
-  EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
-  EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
-
-  Elements = DBuilder.getOrCreateArray(EltTys);
-  EltTys.clear();
-
-  unsigned Flags = llvm::DINode::FlagAppleBlock;
-  unsigned LineNo = 0;
-
-  auto *EltTy =
-      DBuilder.createStructType(Unit, "__block_descriptor", nullptr, LineNo,
-                                FieldOffset, 0, Flags, nullptr, Elements);
-
-  // Bit size, align and offset of the type.
-  uint64_t Size = CGM.getContext().getTypeSize(Ty);
-
-  auto *DescTy = DBuilder.createPointerType(EltTy, Size);
-
-  FieldOffset = 0;
-  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
-  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
-  FType = CGM.getContext().IntTy;
-  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
-  EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
-  FType = CGM.getContext().getPointerType(Ty->getPointeeType());
-  EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
-
-  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
-  FieldSize = CGM.getContext().getTypeSize(Ty);
-  FieldAlign = CGM.getContext().getTypeAlign(Ty);
-  EltTys.push_back(DBuilder.createMemberType(Unit, "__descriptor", nullptr, LineNo,
-                                             FieldSize, FieldAlign, FieldOffset,
-                                             0, DescTy));
-
-  FieldOffset += FieldSize;
-  Elements = DBuilder.getOrCreateArray(EltTys);
-
-  // The __block_literal_generic structs are marked with a special
-  // DW_AT_APPLE_BLOCK attribute and are an implementation detail only
-  // the debugger needs to know about. To allow type uniquing, emit
-  // them without a name or a location.
-  EltTy =
-      DBuilder.createStructType(Unit, "", nullptr, LineNo,
-                                FieldOffset, 0, Flags, nullptr, Elements);
-
-  return DBuilder.createPointerType(EltTy, Size);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
-                                      llvm::DIFile *Unit) {
-  assert(Ty->isTypeAlias());
-  llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);
-
-  SmallString<128> NS;
-  llvm::raw_svector_ostream OS(NS);
-  Ty->getTemplateName().print(OS, CGM.getContext().getPrintingPolicy(),
-                              /*qualified*/ false);
-
-  TemplateSpecializationType::PrintTemplateArgumentList(
-      OS, Ty->getArgs(), Ty->getNumArgs(),
-      CGM.getContext().getPrintingPolicy());
-
-  TypeAliasDecl *AliasDecl = cast<TypeAliasTemplateDecl>(
-      Ty->getTemplateName().getAsTemplateDecl())->getTemplatedDecl();
-
-  SourceLocation Loc = AliasDecl->getLocation();
-  return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
-                                getLineNumber(Loc),
-                                getDeclContextDescriptor(AliasDecl));
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
-                                      llvm::DIFile *Unit) {
-  // We don't set size information, but do specify where the typedef was
-  // declared.
-  SourceLocation Loc = Ty->getDecl()->getLocation();
-
-  // Typedefs are derived from some other type.
-  return DBuilder.createTypedef(
-      getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
-      Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
-      getDeclContextDescriptor(Ty->getDecl()));
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
-                                      llvm::DIFile *Unit) {
-  SmallVector<llvm::Metadata *, 16> EltTys;
-
-  // Add the result type at least.
-  EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
-
-  // Set up remainder of arguments if there is a prototype.
-  // otherwise emit it as a variadic function.
-  if (isa<FunctionNoProtoType>(Ty))
-    EltTys.push_back(DBuilder.createUnspecifiedParameter());
-  else if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) {
-    for (unsigned i = 0, e = FPT->getNumParams(); i != e; ++i)
-      EltTys.push_back(getOrCreateType(FPT->getParamType(i), Unit));
-    if (FPT->isVariadic())
-      EltTys.push_back(DBuilder.createUnspecifiedParameter());
-  }
-
-  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
-  return DBuilder.createSubroutineType(EltTypeArray);
-}
-
-/// Convert an AccessSpecifier into the corresponding DINode flag.
-/// As an optimization, return 0 if the access specifier equals the
-/// default for the containing type.
-static unsigned getAccessFlag(AccessSpecifier Access, const RecordDecl *RD) {
-  AccessSpecifier Default = clang::AS_none;
-  if (RD && RD->isClass())
-    Default = clang::AS_private;
-  else if (RD && (RD->isStruct() || RD->isUnion()))
-    Default = clang::AS_public;
-
-  if (Access == Default)
-    return 0;
-
-  switch (Access) {
-  case clang::AS_private:
-    return llvm::DINode::FlagPrivate;
-  case clang::AS_protected:
-    return llvm::DINode::FlagProtected;
-  case clang::AS_public:
-    return llvm::DINode::FlagPublic;
-  case clang::AS_none:
-    return 0;
-  }
-  llvm_unreachable("unexpected access enumerator");
-}
-
-llvm::DIType *CGDebugInfo::createFieldType(
-    StringRef name, QualType type, uint64_t sizeInBitsOverride,
-    SourceLocation loc, AccessSpecifier AS, uint64_t offsetInBits,
-    llvm::DIFile *tunit, llvm::DIScope *scope, const RecordDecl *RD) {
-  llvm::DIType *debugType = getOrCreateType(type, tunit);
-
-  // Get the location for the field.
-  llvm::DIFile *file = getOrCreateFile(loc);
-  unsigned line = getLineNumber(loc);
-
-  uint64_t SizeInBits = 0;
-  unsigned AlignInBits = 0;
-  if (!type->isIncompleteArrayType()) {
-    TypeInfo TI = CGM.getContext().getTypeInfo(type);
-    SizeInBits = TI.Width;
-    AlignInBits = TI.Align;
-
-    if (sizeInBitsOverride)
-      SizeInBits = sizeInBitsOverride;
-  }
-
-  unsigned flags = getAccessFlag(AS, RD);
-  return DBuilder.createMemberType(scope, name, file, line, SizeInBits,
-                                   AlignInBits, offsetInBits, flags, debugType);
-}
-
-void CGDebugInfo::CollectRecordLambdaFields(
-    const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
-    llvm::DIType *RecordTy) {
-  // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
-  // has the name and the location of the variable so we should iterate over
-  // both concurrently.
-  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
-  RecordDecl::field_iterator Field = CXXDecl->field_begin();
-  unsigned fieldno = 0;
-  for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
-                                             E = CXXDecl->captures_end();
-       I != E; ++I, ++Field, ++fieldno) {
-    const LambdaCapture &C = *I;
-    if (C.capturesVariable()) {
-      VarDecl *V = C.getCapturedVar();
-      llvm::DIFile *VUnit = getOrCreateFile(C.getLocation());
-      StringRef VName = V->getName();
-      uint64_t SizeInBitsOverride = 0;
-      if (Field->isBitField()) {
-        SizeInBitsOverride = Field->getBitWidthValue(CGM.getContext());
-        assert(SizeInBitsOverride && "found named 0-width bitfield");
-      }
-      llvm::DIType *fieldType = createFieldType(
-          VName, Field->getType(), SizeInBitsOverride, C.getLocation(),
-          Field->getAccess(), layout.getFieldOffset(fieldno), VUnit, RecordTy,
-          CXXDecl);
-      elements.push_back(fieldType);
-    } else if (C.capturesThis()) {
-      // TODO: Need to handle 'this' in some way by probably renaming the
-      // this of the lambda class and having a field member of 'this' or
-      // by using AT_object_pointer for the function and having that be
-      // used as 'this' for semantic references.
-      FieldDecl *f = *Field;
-      llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
-      QualType type = f->getType();
-      llvm::DIType *fieldType = createFieldType(
-          "this", type, 0, f->getLocation(), f->getAccess(),
-          layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
-
-      elements.push_back(fieldType);
-    }
-  }
-}
-
-llvm::DIDerivedType *
-CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
-                                     const RecordDecl *RD) {
-  // Create the descriptor for the static variable, with or without
-  // constant initializers.
-  Var = Var->getCanonicalDecl();
-  llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
-  llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);
-
-  unsigned LineNumber = getLineNumber(Var->getLocation());
-  StringRef VName = Var->getName();
-  llvm::Constant *C = nullptr;
-  if (Var->getInit()) {
-    const APValue *Value = Var->evaluateValue();
-    if (Value) {
-      if (Value->isInt())
-        C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
-      if (Value->isFloat())
-        C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
-    }
-  }
-
-  unsigned Flags = getAccessFlag(Var->getAccess(), RD);
-  llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
-      RecordTy, VName, VUnit, LineNumber, VTy, Flags, C);
-  StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
-  return GV;
-}
-
-void CGDebugInfo::CollectRecordNormalField(
-    const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
-    SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
-    const RecordDecl *RD) {
-  StringRef name = field->getName();
-  QualType type = field->getType();
-
-  // Ignore unnamed fields unless they're anonymous structs/unions.
-  if (name.empty() && !type->isRecordType())
-    return;
-
-  uint64_t SizeInBitsOverride = 0;
-  if (field->isBitField()) {
-    SizeInBitsOverride = field->getBitWidthValue(CGM.getContext());
-    assert(SizeInBitsOverride && "found named 0-width bitfield");
-  }
-
-  llvm::DIType *fieldType =
-      createFieldType(name, type, SizeInBitsOverride, field->getLocation(),
-                      field->getAccess(), OffsetInBits, tunit, RecordTy, RD);
-
-  elements.push_back(fieldType);
-}
-
-void CGDebugInfo::CollectRecordFields(
-    const RecordDecl *record, llvm::DIFile *tunit,
-    SmallVectorImpl<llvm::Metadata *> &elements,
-    llvm::DICompositeType *RecordTy) {
-  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(record);
-
-  if (CXXDecl && CXXDecl->isLambda())
-    CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
-  else {
-    const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
-
-    // Field number for non-static fields.
-    unsigned fieldNo = 0;
-
-    // Static and non-static members should appear in the same order as
-    // the corresponding declarations in the source program.
-    for (const auto *I : record->decls())
-      if (const auto *V = dyn_cast<VarDecl>(I)) {
-        // Reuse the existing static member declaration if one exists
-        auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
-        if (MI != StaticDataMemberCache.end()) {
-          assert(MI->second &&
-                 "Static data member declaration should still exist");
-          elements.push_back(MI->second);
-        } else {
-          auto Field = CreateRecordStaticField(V, RecordTy, record);
-          elements.push_back(Field);
-        }
-      } else if (const auto *field = dyn_cast<FieldDecl>(I)) {
-        CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
-                                 elements, RecordTy, record);
-
-        // Bump field number for next field.
-        ++fieldNo;
-      }
-  }
-}
-
-llvm::DISubroutineType *
-CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
-                                   llvm::DIFile *Unit) {
-  const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
-  if (Method->isStatic())
-    return cast_or_null<llvm::DISubroutineType>(
-        getOrCreateType(QualType(Func, 0), Unit));
-  return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
-                                       Func, Unit);
-}
-
-llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
-    QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile *Unit) {
-  // Add "this" pointer.
-  llvm::DITypeRefArray Args(
-      cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
-          ->getTypeArray());
-  assert(Args.size() && "Invalid number of arguments!");
-
-  SmallVector<llvm::Metadata *, 16> Elts;
-
-  // First element is always return type. For 'void' functions it is NULL.
-  Elts.push_back(Args[0]);
-
-  // "this" pointer is always first argument.
-  const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
-  if (isa<ClassTemplateSpecializationDecl>(RD)) {
-    // Create pointer type directly in this case.
-    const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
-    QualType PointeeTy = ThisPtrTy->getPointeeType();
-    unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
-    uint64_t Size = CGM.getTarget().getPointerWidth(AS);
-    uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
-    llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
-    llvm::DIType *ThisPtrType =
-        DBuilder.createPointerType(PointeeType, Size, Align);
-    TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
-    // TODO: This and the artificial type below are misleading, the
-    // types aren't artificial the argument is, but the current
-    // metadata doesn't represent that.
-    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
-    Elts.push_back(ThisPtrType);
-  } else {
-    llvm::DIType *ThisPtrType = getOrCreateType(ThisPtr, Unit);
-    TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
-    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
-    Elts.push_back(ThisPtrType);
-  }
-
-  // Copy rest of the arguments.
-  for (unsigned i = 1, e = Args.size(); i != e; ++i)
-    Elts.push_back(Args[i]);
-
-  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
-
-  unsigned Flags = 0;
-  if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
-    Flags |= llvm::DINode::FlagLValueReference;
-  if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
-    Flags |= llvm::DINode::FlagRValueReference;
-
-  return DBuilder.createSubroutineType(EltTypeArray, Flags);
-}
-
-/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
-/// inside a function.
-static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
-  if (const CXXRecordDecl *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
-    return isFunctionLocalClass(NRD);
-  if (isa<FunctionDecl>(RD->getDeclContext()))
-    return true;
-  return false;
-}
-
-llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
-    const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
-  bool IsCtorOrDtor =
-      isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
-
-  StringRef MethodName = getFunctionName(Method);
-  llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit);
-
-  // Since a single ctor/dtor corresponds to multiple functions, it doesn't
-  // make sense to give a single ctor/dtor a linkage name.
-  StringRef MethodLinkageName;
-  if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
-    MethodLinkageName = CGM.getMangledName(Method);
-
-  // Get the location for the method.
-  llvm::DIFile *MethodDefUnit = nullptr;
-  unsigned MethodLine = 0;
-  if (!Method->isImplicit()) {
-    MethodDefUnit = getOrCreateFile(Method->getLocation());
-    MethodLine = getLineNumber(Method->getLocation());
-  }
-
-  // Collect virtual method info.
-  llvm::DIType *ContainingType = nullptr;
-  unsigned Virtuality = 0;
-  unsigned VIndex = 0;
-
-  if (Method->isVirtual()) {
-    if (Method->isPure())
-      Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
-    else
-      Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
-
-    // It doesn't make sense to give a virtual destructor a vtable index,
-    // since a single destructor has two entries in the vtable.
-    // FIXME: Add proper support for debug info for virtual calls in
-    // the Microsoft ABI, where we may use multiple vptrs to make a vftable
-    // lookup if we have multiple or virtual inheritance.
-    if (!isa<CXXDestructorDecl>(Method) &&
-        !CGM.getTarget().getCXXABI().isMicrosoft())
-      VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
-    ContainingType = RecordTy;
-  }
-
-  unsigned Flags = 0;
-  if (Method->isImplicit())
-    Flags |= llvm::DINode::FlagArtificial;
-  Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
-  if (const CXXConstructorDecl *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
-    if (CXXC->isExplicit())
-      Flags |= llvm::DINode::FlagExplicit;
-  } else if (const CXXConversionDecl *CXXC =
-                 dyn_cast<CXXConversionDecl>(Method)) {
-    if (CXXC->isExplicit())
-      Flags |= llvm::DINode::FlagExplicit;
-  }
-  if (Method->hasPrototype())
-    Flags |= llvm::DINode::FlagPrototyped;
-  if (Method->getRefQualifier() == RQ_LValue)
-    Flags |= llvm::DINode::FlagLValueReference;
-  if (Method->getRefQualifier() == RQ_RValue)
-    Flags |= llvm::DINode::FlagRValueReference;
-
-  llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
-  llvm::DISubprogram *SP = DBuilder.createMethod(
-      RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
-      MethodTy, /*isLocalToUnit=*/false,
-      /* isDefinition=*/false, Virtuality, VIndex, ContainingType, Flags,
-      CGM.getLangOpts().Optimize, TParamsArray.get());
-
-  SPCache[Method->getCanonicalDecl()].reset(SP);
-
-  return SP;
-}
-
-void CGDebugInfo::CollectCXXMemberFunctions(
-    const CXXRecordDecl *RD, llvm::DIFile *Unit,
-    SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {
-
-  // Since we want more than just the individual member decls if we
-  // have templated functions iterate over every declaration to gather
-  // the functions.
-  for (const auto *I : RD->decls()) {
-    const auto *Method = dyn_cast<CXXMethodDecl>(I);
-    // If the member is implicit, don't add it to the member list. This avoids
-    // the member being added to type units by LLVM, while still allowing it
-    // to be emitted into the type declaration/reference inside the compile
-    // unit.
-    // Ditto 'nodebug' methods, for consistency with CodeGenFunction.cpp.
-    // FIXME: Handle Using(Shadow?)Decls here to create
-    // DW_TAG_imported_declarations inside the class for base decls brought into
-    // derived classes. GDB doesn't seem to notice/leverage these when I tried
-    // it, so I'm not rushing to fix this. (GCC seems to produce them, if
-    // referenced)
-    if (!Method || Method->isImplicit() || Method->hasAttr<NoDebugAttr>())
-      continue;
-
-    if (Method->getType()->getAs<FunctionProtoType>()->getContainedAutoType())
-      continue;
-
-    // Reuse the existing member function declaration if it exists.
-    // It may be associated with the declaration of the type & should be
-    // reused as we're building the definition.
-    //
-    // This situation can arise in the vtable-based debug info reduction where
-    // implicit members are emitted in a non-vtable TU.
-    auto MI = SPCache.find(Method->getCanonicalDecl());
-    EltTys.push_back(MI == SPCache.end()
-                         ? CreateCXXMemberFunction(Method, Unit, RecordTy)
-                         : static_cast<llvm::Metadata *>(MI->second));
-  }
-}
-
-void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
-                                  SmallVectorImpl<llvm::Metadata *> &EltTys,
-                                  llvm::DIType *RecordTy) {
-  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
-  for (const auto &BI : RD->bases()) {
-    unsigned BFlags = 0;
-    uint64_t BaseOffset;
-
-    const CXXRecordDecl *Base =
-        cast<CXXRecordDecl>(BI.getType()->getAs<RecordType>()->getDecl());
-
-    if (BI.isVirtual()) {
-      if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
-        // virtual base offset offset is -ve. The code generator emits dwarf
-        // expression where it expects +ve number.
-        BaseOffset = 0 - CGM.getItaniumVTableContext()
-                             .getVirtualBaseOffsetOffset(RD, Base)
-                             .getQuantity();
-      } else {
-        // In the MS ABI, store the vbtable offset, which is analogous to the
-        // vbase offset offset in Itanium.
-        BaseOffset =
-            4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
-      }
-      BFlags = llvm::DINode::FlagVirtual;
-    } else
-      BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
-    // FIXME: Inconsistent units for BaseOffset. It is in bytes when
-    // BI->isVirtual() and bits when not.
-
-    BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
-    llvm::DIType *DTy = DBuilder.createInheritance(
-        RecordTy, getOrCreateType(BI.getType(), Unit), BaseOffset, BFlags);
-    EltTys.push_back(DTy);
-  }
-}
-
-llvm::DINodeArray
-CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
-                                   ArrayRef<TemplateArgument> TAList,
-                                   llvm::DIFile *Unit) {
-  SmallVector<llvm::Metadata *, 16> TemplateParams;
-  for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
-    const TemplateArgument &TA = TAList[i];
-    StringRef Name;
-    if (TPList)
-      Name = TPList->getParam(i)->getName();
-    switch (TA.getKind()) {
-    case TemplateArgument::Type: {
-      llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);
-      TemplateParams.push_back(
-          DBuilder.createTemplateTypeParameter(TheCU, Name, TTy));
-    } break;
-    case TemplateArgument::Integral: {
-      llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
-      TemplateParams.push_back(DBuilder.createTemplateValueParameter(
-          TheCU, Name, TTy,
-          llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral())));
-    } break;
-    case TemplateArgument::Declaration: {
-      const ValueDecl *D = TA.getAsDecl();
-      QualType T = TA.getParamTypeForDecl().getDesugaredType(CGM.getContext());
-      llvm::DIType *TTy = getOrCreateType(T, Unit);
-      llvm::Constant *V = nullptr;
-      const CXXMethodDecl *MD;
-      // Variable pointer template parameters have a value that is the address
-      // of the variable.
-      if (const auto *VD = dyn_cast<VarDecl>(D))
-        V = CGM.GetAddrOfGlobalVar(VD);
-      // Member function pointers have special support for building them, though
-      // this is currently unsupported in LLVM CodeGen.
-      else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
-        V = CGM.getCXXABI().EmitMemberFunctionPointer(MD);
-      else if (const auto *FD = dyn_cast<FunctionDecl>(D))
-        V = CGM.GetAddrOfFunction(FD);
-      // Member data pointers have special handling too to compute the fixed
-      // offset within the object.
-      else if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr())) {
-        // These five lines (& possibly the above member function pointer
-        // handling) might be able to be refactored to use similar code in
-        // CodeGenModule::getMemberPointerConstant
-        uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
-        CharUnits chars =
-            CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
-        V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
-      }
-      TemplateParams.push_back(DBuilder.createTemplateValueParameter(
-          TheCU, Name, TTy,
-          cast_or_null<llvm::Constant>(V->stripPointerCasts())));
-    } break;
-    case TemplateArgument::NullPtr: {
-      QualType T = TA.getNullPtrType();
-      llvm::DIType *TTy = getOrCreateType(T, Unit);
-      llvm::Constant *V = nullptr;
-      // Special case member data pointer null values since they're actually -1
-      // instead of zero.
-      if (const MemberPointerType *MPT =
-              dyn_cast<MemberPointerType>(T.getTypePtr()))
-        // But treat member function pointers as simple zero integers because
-        // it's easier than having a special case in LLVM's CodeGen. If LLVM
-        // CodeGen grows handling for values of non-null member function
-        // pointers then perhaps we could remove this special case and rely on
-        // EmitNullMemberPointer for member function pointers.
-        if (MPT->isMemberDataPointer())
-          V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
-      if (!V)
-        V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
-      TemplateParams.push_back(DBuilder.createTemplateValueParameter(
-          TheCU, Name, TTy, cast<llvm::Constant>(V)));
-    } break;
-    case TemplateArgument::Template:
-      TemplateParams.push_back(DBuilder.createTemplateTemplateParameter(
-          TheCU, Name, nullptr,
-          TA.getAsTemplate().getAsTemplateDecl()->getQualifiedNameAsString()));
-      break;
-    case TemplateArgument::Pack:
-      TemplateParams.push_back(DBuilder.createTemplateParameterPack(
-          TheCU, Name, nullptr,
-          CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit)));
-      break;
-    case TemplateArgument::Expression: {
-      const Expr *E = TA.getAsExpr();
-      QualType T = E->getType();
-      if (E->isGLValue())
-        T = CGM.getContext().getLValueReferenceType(T);
-      llvm::Constant *V = CGM.EmitConstantExpr(E, T);
-      assert(V && "Expression in template argument isn't constant");
-      llvm::DIType *TTy = getOrCreateType(T, Unit);
-      TemplateParams.push_back(DBuilder.createTemplateValueParameter(
-          TheCU, Name, TTy, cast<llvm::Constant>(V->stripPointerCasts())));
-    } break;
-    // And the following should never occur:
-    case TemplateArgument::TemplateExpansion:
-    case TemplateArgument::Null:
-      llvm_unreachable(
-          "These argument types shouldn't exist in concrete types");
-    }
-  }
-  return DBuilder.getOrCreateArray(TemplateParams);
-}
-
-llvm::DINodeArray
-CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
-                                           llvm::DIFile *Unit) {
-  if (FD->getTemplatedKind() ==
-      FunctionDecl::TK_FunctionTemplateSpecialization) {
-    const TemplateParameterList *TList = FD->getTemplateSpecializationInfo()
-                                             ->getTemplate()
-                                             ->getTemplateParameters();
-    return CollectTemplateParams(
-        TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
-  }
-  return llvm::DINodeArray();
-}
-
-llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
-    const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
-  // Always get the full list of parameters, not just the ones from
-  // the specialization.
-  TemplateParameterList *TPList =
-      TSpecial->getSpecializedTemplate()->getTemplateParameters();
-  const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
-  return CollectTemplateParams(TPList, TAList.asArray(), Unit);
-}
-
-llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
-  if (VTablePtrType)
-    return VTablePtrType;
-
-  ASTContext &Context = CGM.getContext();
-
-  /* Function type */
-  llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
-  llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
-  llvm::DIType *SubTy = DBuilder.createSubroutineType(SElements);
-  unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
-  llvm::DIType *vtbl_ptr_type =
-      DBuilder.createPointerType(SubTy, Size, 0, "__vtbl_ptr_type");
-  VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
-  return VTablePtrType;
-}
-
 StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
   // Copy the gdb compatible name on the side and use its reference.
   return internString("_vptr$", RD->getNameAsString());
 }
 
-void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
-                                    SmallVectorImpl<llvm::Metadata *> &EltTys) {
-  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
-
-  // If there is a primary base then it will hold vtable info.
-  if (RL.getPrimaryBase())
-    return;
-
-  // If this class is not dynamic then there is not any vtable info to collect.
-  if (!RD->isDynamicClass())
-    return;
-
-  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
-  llvm::DIType *VPTR = DBuilder.createMemberType(
-      Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
-      llvm::DINode::FlagArtificial, getOrCreateVTablePtrType(Unit));
-  EltTys.push_back(VPTR);
-}
-
-llvm::DIType *CGDebugInfo::getOrCreateRecordType(QualType RTy,
-                                                 SourceLocation Loc) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
-  return T;
-}
-
-llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
-                                                    SourceLocation Loc) {
-  return getOrCreateStandaloneType(D, Loc);
-}
-
-llvm::DIType *CGDebugInfo::getOrCreateStandaloneType(QualType D,
-                                                     SourceLocation Loc) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  assert(!D.isNull() && "null type");
-  llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
-  assert(T && "could not create debug info for type");
-
-  // Composite types with UIDs were already retained by DIBuilder
-  // because they are only referenced by name in the IR.
-  if (auto *CTy = dyn_cast<llvm::DICompositeType>(T))
-    if (!CTy->getIdentifier().empty())
-      return T;
-  RetainedTypes.push_back(D.getAsOpaquePtr());
-  return T;
-}
-
-void CGDebugInfo::completeType(const EnumDecl *ED) {
-  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
-    return;
-  QualType Ty = CGM.getContext().getEnumType(ED);
-  void *TyPtr = Ty.getAsOpaquePtr();
-  auto I = TypeCache.find(TyPtr);
-  if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
-    return;
-  llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
-  assert(!Res->isForwardDecl());
-  TypeCache[TyPtr].reset(Res);
-}
-
-void CGDebugInfo::completeType(const RecordDecl *RD) {
-  if (DebugKind > codegenoptions::LimitedDebugInfo ||
-      !CGM.getLangOpts().CPlusPlus)
-    completeRequiredType(RD);
-}
-
-void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
-  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
-    return;
-
-  if (const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
-    if (CXXDecl->isDynamicClass())
-      return;
-
-  if (DebugTypeExtRefs && RD->isFromASTFile())
-    return;
-
-  QualType Ty = CGM.getContext().getRecordType(RD);
-  llvm::DIType *T = getTypeOrNull(Ty);
-  if (T && T->isForwardDecl())
-    completeClassData(RD);
-}
-
-void CGDebugInfo::completeClassData(const RecordDecl *RD) {
-  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
-    return;
-  QualType Ty = CGM.getContext().getRecordType(RD);
-  void *TyPtr = Ty.getAsOpaquePtr();
-  auto I = TypeCache.find(TyPtr);
-  if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
-    return;
-  llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
-  assert(!Res->isForwardDecl());
-  TypeCache[TyPtr].reset(Res);
-}
-
-static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I,
-                                        CXXRecordDecl::method_iterator End) {
-  for (; I != End; ++I)
-    if (FunctionDecl *Tmpl = I->getInstantiatedFromMemberFunction())
-      if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
-          !I->getMemberSpecializationInfo()->isExplicitSpecialization())
-        return true;
-  return false;
-}
-
-static bool shouldOmitDefinition(codegenoptions::DebugInfoKind DebugKind,
-                                 bool DebugTypeExtRefs, const RecordDecl *RD,
-                                 const LangOptions &LangOpts) {
-  // Does the type exist in an imported clang module?
-  if (DebugTypeExtRefs && RD->isFromASTFile() && RD->getDefinition() &&
-      (RD->isExternallyVisible() || !RD->getName().empty()))
-    return true;
-
-  if (DebugKind > codegenoptions::LimitedDebugInfo)
-    return false;
-
-  if (!LangOpts.CPlusPlus)
-    return false;
-
-  if (!RD->isCompleteDefinitionRequired())
-    return true;
-
-  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
-
-  if (!CXXDecl)
-    return false;
-
-  if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass())
-    return true;
-
-  TemplateSpecializationKind Spec = TSK_Undeclared;
-  if (const ClassTemplateSpecializationDecl *SD =
-          dyn_cast<ClassTemplateSpecializationDecl>(RD))
-    Spec = SD->getSpecializationKind();
-
-  if (Spec == TSK_ExplicitInstantiationDeclaration &&
-      hasExplicitMemberDefinition(CXXDecl->method_begin(),
-                                  CXXDecl->method_end()))
-    return true;
-
-  return false;
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
-  RecordDecl *RD = Ty->getDecl();
-  llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
-  if (T || shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD,
-                                CGM.getLangOpts())) {
-    if (!T)
-      T = getOrCreateRecordFwdDecl(Ty, getDeclContextDescriptor(RD));
-    return T;
-  }
-
-  return CreateTypeDefinition(Ty);
-}
-
-llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
-  RecordDecl *RD = Ty->getDecl();
-
-  // Get overall information about the record type for the debug info.
-  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
-
-  // Records and classes and unions can all be recursive.  To handle them, we
-  // first generate a debug descriptor for the struct as a forward declaration.
-  // Then (if it is a definition) we go through and get debug info for all of
-  // its members.  Finally, we create a descriptor for the complete type (which
-  // may refer to the forward decl if the struct is recursive) and replace all
-  // uses of the forward declaration with the final definition.
-  llvm::DICompositeType *FwdDecl = getOrCreateLimitedType(Ty, DefUnit);
-
-  const RecordDecl *D = RD->getDefinition();
-  if (!D || !D->isCompleteDefinition())
-    return FwdDecl;
-
-  if (const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
-    CollectContainingType(CXXDecl, FwdDecl);
-
-  // Push the struct on region stack.
-  LexicalBlockStack.emplace_back(&*FwdDecl);
-  RegionMap[Ty->getDecl()].reset(FwdDecl);
-
-  // Convert all the elements.
-  SmallVector<llvm::Metadata *, 16> EltTys;
-  // what about nested types?
-
-  // Note: The split of CXXDecl information here is intentional, the
-  // gdb tests will depend on a certain ordering at printout. The debug
-  // information offsets are still correct if we merge them all together
-  // though.
-  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
-  if (CXXDecl) {
-    CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
-    CollectVTableInfo(CXXDecl, DefUnit, EltTys);
-  }
-
-  // Collect data fields (including static variables and any initializers).
-  CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
-  if (CXXDecl)
-    CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
-
-  LexicalBlockStack.pop_back();
-  RegionMap.erase(Ty->getDecl());
-
-  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
-  DBuilder.replaceArrays(FwdDecl, Elements);
-
-  if (FwdDecl->isTemporary())
-    FwdDecl =
-        llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));
-
-  RegionMap[Ty->getDecl()].reset(FwdDecl);
-  return FwdDecl;
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
-                                      llvm::DIFile *Unit) {
-  // Ignore protocols.
-  return getOrCreateType(Ty->getBaseType(), Unit);
-}
-
-/// \return true if Getter has the default name for the property PD.
-static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
-                                 const ObjCMethodDecl *Getter) {
-  assert(PD);
-  if (!Getter)
-    return true;
-
-  assert(Getter->getDeclName().isObjCZeroArgSelector());
-  return PD->getName() ==
-         Getter->getDeclName().getObjCSelector().getNameForSlot(0);
-}
-
-/// \return true if Setter has the default name for the property PD.
-static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
-                                 const ObjCMethodDecl *Setter) {
-  assert(PD);
-  if (!Setter)
-    return true;
-
-  assert(Setter->getDeclName().isObjCOneArgSelector());
-  return SelectorTable::constructSetterName(PD->getName()) ==
-         Setter->getDeclName().getObjCSelector().getNameForSlot(0);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
-                                      llvm::DIFile *Unit) {
-  ObjCInterfaceDecl *ID = Ty->getDecl();
-  if (!ID)
-    return nullptr;
-
-  // Return a forward declaration if this type was imported from a clang module.
-  if (DebugTypeExtRefs && ID->isFromASTFile() && ID->getDefinition())
-    return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
-                                      ID->getName(),
-                                      getDeclContextDescriptor(ID), Unit, 0);
-
-  // Get overall information about the record type for the debug info.
-  llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
-  unsigned Line = getLineNumber(ID->getLocation());
-  auto RuntimeLang =
-      static_cast<llvm::dwarf::SourceLanguage>(TheCU->getSourceLanguage());
-
-  // If this is just a forward declaration return a special forward-declaration
-  // debug type since we won't be able to lay out the entire type.
-  ObjCInterfaceDecl *Def = ID->getDefinition();
-  if (!Def || !Def->getImplementation()) {
-    llvm::DIScope *Mod = getParentModuleOrNull(ID);
-    llvm::DIType *FwdDecl = DBuilder.createReplaceableCompositeType(
-        llvm::dwarf::DW_TAG_structure_type, ID->getName(), Mod ? Mod : TheCU,
-        DefUnit, Line, RuntimeLang);
-    ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
-    return FwdDecl;
-  }
-
-  return CreateTypeDefinition(Ty, Unit);
-}
-
-llvm::DIModule *
-CGDebugInfo::getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
-                                  bool CreateSkeletonCU) {
-  // Use the Module pointer as the key into the cache. This is a
-  // nullptr if the "Module" is a PCH, which is safe because we don't
-  // support chained PCH debug info, so there can only be a single PCH.
-  const Module *M = Mod.getModuleOrNull();
-  auto ModRef = ModuleCache.find(M);
-  if (ModRef != ModuleCache.end())
-    return cast<llvm::DIModule>(ModRef->second);
-
-  // Macro definitions that were defined with "-D" on the command line.
-  SmallString<128> ConfigMacros;
-  {
-    llvm::raw_svector_ostream OS(ConfigMacros);
-    const auto &PPOpts = CGM.getPreprocessorOpts();
-    unsigned I = 0;
-    // Translate the macro definitions back into a commmand line.
-    for (auto &M : PPOpts.Macros) {
-      if (++I > 1)
-        OS << " ";
-      const std::string &Macro = M.first;
-      bool Undef = M.second;
-      OS << "\"-" << (Undef ? 'U' : 'D');
-      for (char c : Macro)
-        switch (c) {
-        case '\\' : OS << "\\\\"; break;
-        case '"'  : OS << "\\\""; break;
-        default: OS << c;
-        }
-      OS << '\"';
-    }
-  }
-
-  bool IsRootModule = M ? !M->Parent : true;
-  if (CreateSkeletonCU && IsRootModule) {
-    // PCH files don't have a signature field in the control block,
-    // but LLVM detects skeleton CUs by looking for a non-zero DWO id.
-    uint64_t Signature = Mod.getSignature() ? Mod.getSignature() : ~1ULL;
-    llvm::DIBuilder DIB(CGM.getModule());
-    DIB.createCompileUnit(TheCU->getSourceLanguage(), Mod.getModuleName(),
-                          Mod.getPath(), TheCU->getProducer(), true,
-                          StringRef(), 0, Mod.getASTFile(),
-                          llvm::DICompileUnit::FullDebug, Signature);
-    DIB.finalize();
-  }
-  llvm::DIModule *Parent =
-      IsRootModule ? nullptr
-                   : getOrCreateModuleRef(
-                         ExternalASTSource::ASTSourceDescriptor(*M->Parent),
-                         CreateSkeletonCU);
-  llvm::DIModule *DIMod =
-      DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
-                            Mod.getPath(), CGM.getHeaderSearchOpts().Sysroot);
-  ModuleCache[M].reset(DIMod);
-  return DIMod;
-}
-
-llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
-                                                llvm::DIFile *Unit) {
-  ObjCInterfaceDecl *ID = Ty->getDecl();
-  llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
-  unsigned Line = getLineNumber(ID->getLocation());
-  unsigned RuntimeLang = TheCU->getSourceLanguage();
-
-  // Bit size, align and offset of the type.
-  uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
-
-  unsigned Flags = 0;
-  if (ID->getImplementation())
-    Flags |= llvm::DINode::FlagObjcClassComplete;
-
-  llvm::DIScope *Mod = getParentModuleOrNull(ID);
-  llvm::DICompositeType *RealDecl = DBuilder.createStructType(
-      Mod ? Mod : Unit, ID->getName(), DefUnit, Line, Size, Align, Flags,
-      nullptr, llvm::DINodeArray(), RuntimeLang);
-
-  QualType QTy(Ty, 0);
-  TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
-
-  // Push the struct on region stack.
-  LexicalBlockStack.emplace_back(RealDecl);
-  RegionMap[Ty->getDecl()].reset(RealDecl);
-
-  // Convert all the elements.
-  SmallVector<llvm::Metadata *, 16> EltTys;
-
-  ObjCInterfaceDecl *SClass = ID->getSuperClass();
-  if (SClass) {
-    llvm::DIType *SClassTy =
-        getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
-    if (!SClassTy)
-      return nullptr;
-
-    llvm::DIType *InhTag = DBuilder.createInheritance(RealDecl, SClassTy, 0, 0);
-    EltTys.push_back(InhTag);
-  }
-
-  // Create entries for all of the properties.
-  auto AddProperty = [&](const ObjCPropertyDecl *PD) {
-    SourceLocation Loc = PD->getLocation();
-    llvm::DIFile *PUnit = getOrCreateFile(Loc);
-    unsigned PLine = getLineNumber(Loc);
-    ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
-    ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
-    llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
-        PD->getName(), PUnit, PLine,
-        hasDefaultGetterName(PD, Getter) ? ""
-                                         : getSelectorName(PD->getGetterName()),
-        hasDefaultSetterName(PD, Setter) ? ""
-                                         : getSelectorName(PD->getSetterName()),
-        PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
-    EltTys.push_back(PropertyNode);
-  };
-  {
-    llvm::SmallPtrSet<const IdentifierInfo*, 16> PropertySet;
-    for (const ObjCCategoryDecl *ClassExt : ID->known_extensions())
-      for (auto *PD : ClassExt->properties()) {
-        PropertySet.insert(PD->getIdentifier());
-        AddProperty(PD);
-      }
-    for (const auto *PD : ID->properties()) {
-      // Don't emit duplicate metadata for properties that were already in a
-      // class extension.
-      if (!PropertySet.insert(PD->getIdentifier()).second)
-        continue;
-      AddProperty(PD);
-    }
-  }
-
-  const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
-  unsigned FieldNo = 0;
-  for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
-       Field = Field->getNextIvar(), ++FieldNo) {
-    llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
-    if (!FieldTy)
-      return nullptr;
-
-    StringRef FieldName = Field->getName();
-
-    // Ignore unnamed fields.
-    if (FieldName.empty())
-      continue;
-
-    // Get the location for the field.
-    llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
-    unsigned FieldLine = getLineNumber(Field->getLocation());
-    QualType FType = Field->getType();
-    uint64_t FieldSize = 0;
-    unsigned FieldAlign = 0;
-
-    if (!FType->isIncompleteArrayType()) {
-
-      // Bit size, align and offset of the type.
-      FieldSize = Field->isBitField()
-                      ? Field->getBitWidthValue(CGM.getContext())
-                      : CGM.getContext().getTypeSize(FType);
-      FieldAlign = CGM.getContext().getTypeAlign(FType);
-    }
-
-    uint64_t FieldOffset;
-    if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
-      // We don't know the runtime offset of an ivar if we're using the
-      // non-fragile ABI.  For bitfields, use the bit offset into the first
-      // byte of storage of the bitfield.  For other fields, use zero.
-      if (Field->isBitField()) {
-        FieldOffset =
-            CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
-        FieldOffset %= CGM.getContext().getCharWidth();
-      } else {
-        FieldOffset = 0;
-      }
-    } else {
-      FieldOffset = RL.getFieldOffset(FieldNo);
-    }
-
-    unsigned Flags = 0;
-    if (Field->getAccessControl() == ObjCIvarDecl::Protected)
-      Flags = llvm::DINode::FlagProtected;
-    else if (Field->getAccessControl() == ObjCIvarDecl::Private)
-      Flags = llvm::DINode::FlagPrivate;
-    else if (Field->getAccessControl() == ObjCIvarDecl::Public)
-      Flags = llvm::DINode::FlagPublic;
-
-    llvm::MDNode *PropertyNode = nullptr;
-    if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
-      if (ObjCPropertyImplDecl *PImpD =
-              ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
-        if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
-          SourceLocation Loc = PD->getLocation();
-          llvm::DIFile *PUnit = getOrCreateFile(Loc);
-          unsigned PLine = getLineNumber(Loc);
-          ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
-          ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
-          PropertyNode = DBuilder.createObjCProperty(
-              PD->getName(), PUnit, PLine,
-              hasDefaultGetterName(PD, Getter) ? "" : getSelectorName(
-                                                          PD->getGetterName()),
-              hasDefaultSetterName(PD, Setter) ? "" : getSelectorName(
-                                                          PD->getSetterName()),
-              PD->getPropertyAttributes(),
-              getOrCreateType(PD->getType(), PUnit));
-        }
-      }
-    }
-    FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
-                                      FieldSize, FieldAlign, FieldOffset, Flags,
-                                      FieldTy, PropertyNode);
-    EltTys.push_back(FieldTy);
-  }
-
-  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
-  DBuilder.replaceArrays(RealDecl, Elements);
-
-  LexicalBlockStack.pop_back();
-  return RealDecl;
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
-                                      llvm::DIFile *Unit) {
-  llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
-  int64_t Count = Ty->getNumElements();
-  if (Count == 0)
-    // If number of elements are not known then this is an unbounded array.
-    // Use Count == -1 to express such arrays.
-    Count = -1;
-
-  llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(0, Count);
-  llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
-
-  uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
-
-  return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
-  uint64_t Size;
-  uint64_t Align;
-
-  // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
-  if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
-    Size = 0;
-    Align =
-        CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
-  } else if (Ty->isIncompleteArrayType()) {
-    Size = 0;
-    if (Ty->getElementType()->isIncompleteType())
-      Align = 0;
-    else
-      Align = CGM.getContext().getTypeAlign(Ty->getElementType());
-  } else if (Ty->isIncompleteType()) {
-    Size = 0;
-    Align = 0;
-  } else {
-    // Size and align of the whole array, not the element type.
-    Size = CGM.getContext().getTypeSize(Ty);
-    Align = CGM.getContext().getTypeAlign(Ty);
-  }
-
-  // Add the dimensions of the array.  FIXME: This loses CV qualifiers from
-  // interior arrays, do we care?  Why aren't nested arrays represented the
-  // obvious/recursive way?
-  SmallVector<llvm::Metadata *, 8> Subscripts;
-  QualType EltTy(Ty, 0);
-  while ((Ty = dyn_cast<ArrayType>(EltTy))) {
-    // If the number of elements is known, then count is that number. Otherwise,
-    // it's -1. This allows us to represent a subrange with an array of 0
-    // elements, like this:
-    //
-    //   struct foo {
-    //     int x[0];
-    //   };
-    int64_t Count = -1; // Count == -1 is an unbounded array.
-    if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
-      Count = CAT->getSize().getZExtValue();
-
-    // FIXME: Verify this is right for VLAs.
-    Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
-    EltTy = Ty->getElementType();
-  }
-
-  llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
-
-  return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
-                                  SubscriptArray);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
-                                      llvm::DIFile *Unit) {
-  return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
-                               Ty->getPointeeType(), Unit);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
-                                      llvm::DIFile *Unit) {
-  return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
-                               Ty->getPointeeType(), Unit);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
-                                      llvm::DIFile *U) {
-  uint64_t Size =
-      !Ty->isIncompleteType() ? CGM.getContext().getTypeSize(Ty) : 0;
-  llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
-  if (Ty->isMemberDataPointerType())
-    return DBuilder.createMemberPointerType(
-        getOrCreateType(Ty->getPointeeType(), U), ClassType, Size);
-
-  const FunctionProtoType *FPT =
-      Ty->getPointeeType()->getAs<FunctionProtoType>();
-  return DBuilder.createMemberPointerType(
-      getOrCreateInstanceMethodType(CGM.getContext().getPointerType(QualType(
-                                        Ty->getClass(), FPT->getTypeQuals())),
-                                    FPT, U),
-      ClassType, Size);
-}
-
-llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
-  // Ignore the atomic wrapping
-  // FIXME: What is the correct representation?
-  return getOrCreateType(Ty->getValueType(), U);
-}
-
-llvm::DIType* CGDebugInfo::CreateType(const PipeType *Ty,
-                                     llvm::DIFile *U) {
-  return getOrCreateType(Ty->getElementType(), U);
-}
-
-llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
-  const EnumDecl *ED = Ty->getDecl();
-
-  uint64_t Size = 0;
-  uint64_t Align = 0;
-  if (!ED->getTypeForDecl()->isIncompleteType()) {
-    Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
-    Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
-  }
-
-  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
-
-  bool isImportedFromModule =
-      DebugTypeExtRefs && ED->isFromASTFile() && ED->getDefinition();
-
-  // If this is just a forward declaration, construct an appropriately
-  // marked node and just return it.
-  if (isImportedFromModule || !ED->getDefinition()) {
-    // Note that it is possible for enums to be created as part of
-    // their own declcontext. In this case a FwdDecl will be created
-    // twice. This doesn't cause a problem because both FwdDecls are
-    // entered into the ReplaceMap: finalize() will replace the first
-    // FwdDecl with the second and then replace the second with
-    // complete type.
-    llvm::DIScope *EDContext = getDeclContextDescriptor(ED);
-    llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
-    llvm::TempDIScope TmpContext(DBuilder.createReplaceableCompositeType(
-        llvm::dwarf::DW_TAG_enumeration_type, "", TheCU, DefUnit, 0));
-
-    unsigned Line = getLineNumber(ED->getLocation());
-    StringRef EDName = ED->getName();
-    llvm::DIType *RetTy = DBuilder.createReplaceableCompositeType(
-        llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
-        0, Size, Align, llvm::DINode::FlagFwdDecl, FullName);
-
-    ReplaceMap.emplace_back(
-        std::piecewise_construct, std::make_tuple(Ty),
-        std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
-    return RetTy;
-  }
-
-  return CreateTypeDefinition(Ty);
-}
-
-llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
-  const EnumDecl *ED = Ty->getDecl();
-  uint64_t Size = 0;
-  uint64_t Align = 0;
-  if (!ED->getTypeForDecl()->isIncompleteType()) {
-    Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
-    Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
-  }
-
-  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
-
-  // Create elements for each enumerator.
-  SmallVector<llvm::Metadata *, 16> Enumerators;
-  ED = ED->getDefinition();
-  for (const auto *Enum : ED->enumerators()) {
-    Enumerators.push_back(DBuilder.createEnumerator(
-        Enum->getName(), Enum->getInitVal().getSExtValue()));
-  }
-
-  // Return a CompositeType for the enum itself.
-  llvm::DINodeArray EltArray = DBuilder.getOrCreateArray(Enumerators);
-
-  llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
-  unsigned Line = getLineNumber(ED->getLocation());
-  llvm::DIScope *EnumContext = getDeclContextDescriptor(ED);
-  llvm::DIType *ClassTy =
-      ED->isFixed() ? getOrCreateType(ED->getIntegerType(), DefUnit) : nullptr;
-  return DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit,
-                                        Line, Size, Align, EltArray, ClassTy,
-                                        FullName);
-}
-
-static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
-  Qualifiers Quals;
-  do {
-    Qualifiers InnerQuals = T.getLocalQualifiers();
-    // Qualifiers::operator+() doesn't like it if you add a Qualifier
-    // that is already there.
-    Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
-    Quals += InnerQuals;
-    QualType LastT = T;
-    switch (T->getTypeClass()) {
-    default:
-      return C.getQualifiedType(T.getTypePtr(), Quals);
-    case Type::TemplateSpecialization: {
-      const auto *Spec = cast<TemplateSpecializationType>(T);
-      if (Spec->isTypeAlias())
-        return C.getQualifiedType(T.getTypePtr(), Quals);
-      T = Spec->desugar();
-      break;
-    }
-    case Type::TypeOfExpr:
-      T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
-      break;
-    case Type::TypeOf:
-      T = cast<TypeOfType>(T)->getUnderlyingType();
-      break;
-    case Type::Decltype:
-      T = cast<DecltypeType>(T)->getUnderlyingType();
-      break;
-    case Type::UnaryTransform:
-      T = cast<UnaryTransformType>(T)->getUnderlyingType();
-      break;
-    case Type::Attributed:
-      T = cast<AttributedType>(T)->getEquivalentType();
-      break;
-    case Type::Elaborated:
-      T = cast<ElaboratedType>(T)->getNamedType();
-      break;
-    case Type::Paren:
-      T = cast<ParenType>(T)->getInnerType();
-      break;
-    case Type::SubstTemplateTypeParm:
-      T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
-      break;
-    case Type::Auto:
-      QualType DT = cast<AutoType>(T)->getDeducedType();
-      assert(!DT.isNull() && "Undeduced types shouldn't reach here.");
-      T = DT;
-      break;
-    }
-
-    assert(T != LastT && "Type unwrapping failed to unwrap!");
-    (void)LastT;
-  } while (true);
-}
-
-llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
-
-  // Unwrap the type as needed for debug information.
-  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
-
-  auto it = TypeCache.find(Ty.getAsOpaquePtr());
-  if (it != TypeCache.end()) {
-    // Verify that the debug info still exists.
-    if (llvm::Metadata *V = it->second)
-      return cast<llvm::DIType>(V);
-  }
-
-  return nullptr;
-}
-
-void CGDebugInfo::completeTemplateDefinition(
-    const ClassTemplateSpecializationDecl &SD) {
-  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
-    return;
-
-  completeClassData(&SD);
-  // In case this type has no member function definitions being emitted, ensure
-  // it is retained
-  RetainedTypes.push_back(CGM.getContext().getRecordType(&SD).getAsOpaquePtr());
-}
-
-llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
-  if (Ty.isNull())
-    return nullptr;
-
-  // Unwrap the type as needed for debug information.
-  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
-
-  if (auto *T = getTypeOrNull(Ty))
-    return T;
-
-  llvm::DIType *Res = CreateTypeNode(Ty, Unit);
-  void* TyPtr = Ty.getAsOpaquePtr();
-
-  // And update the type cache.
-  TypeCache[TyPtr].reset(Res);
-
-  return Res;
-}
-
-llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
-  // A forward declaration inside a module header does not belong to the module.
-  if (isa<RecordDecl>(D) && !cast<RecordDecl>(D)->getDefinition())
-    return nullptr;
-  if (DebugTypeExtRefs && D->isFromASTFile()) {
-    // Record a reference to an imported clang module or precompiled header.
-    auto *Reader = CGM.getContext().getExternalSource();
-    auto Idx = D->getOwningModuleID();
-    auto Info = Reader->getSourceDescriptor(Idx);
-    if (Info)
-      return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
-  } else if (ClangModuleMap) {
-    // We are building a clang module or a precompiled header.
-    //
-    // TODO: When D is a CXXRecordDecl or a C++ Enum, the ODR applies
-    // and it wouldn't be necessary to specify the parent scope
-    // because the type is already unique by definition (it would look
-    // like the output of -fno-standalone-debug). On the other hand,
-    // the parent scope helps a consumer to quickly locate the object
-    // file where the type's definition is located, so it might be
-    // best to make this behavior a command line or debugger tuning
-    // option.
-    FullSourceLoc Loc(D->getLocation(), CGM.getContext().getSourceManager());
-    if (Module *M = ClangModuleMap->inferModuleFromLocation(Loc)) {
-      // This is a (sub-)module.
-      auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
-      return getOrCreateModuleRef(Info, /*SkeletonCU=*/false);
-    } else {
-      // This the precompiled header being built.
-      return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
-    }
-  }
-
-  return nullptr;
-}
-
-llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
-  // Handle qualifiers, which recursively handles what they refer to.
-  if (Ty.hasLocalQualifiers())
-    return CreateQualifiedType(Ty, Unit);
-
-  // Work out details of type.
-  switch (Ty->getTypeClass()) {
-#define TYPE(Class, Base)
-#define ABSTRACT_TYPE(Class, Base)
-#define NON_CANONICAL_TYPE(Class, Base)
-#define DEPENDENT_TYPE(Class, Base) case Type::Class:
-#include "clang/AST/TypeNodes.def"
-    llvm_unreachable("Dependent types cannot show up in debug information");
-
-  case Type::ExtVector:
-  case Type::Vector:
-    return CreateType(cast<VectorType>(Ty), Unit);
-  case Type::ObjCObjectPointer:
-    return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
-  case Type::ObjCObject:
-    return CreateType(cast<ObjCObjectType>(Ty), Unit);
-  case Type::ObjCInterface:
-    return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
-  case Type::Builtin:
-    return CreateType(cast<BuiltinType>(Ty));
-  case Type::Complex:
-    return CreateType(cast<ComplexType>(Ty));
-  case Type::Pointer:
-    return CreateType(cast<PointerType>(Ty), Unit);
-  case Type::Adjusted:
-  case Type::Decayed:
-    // Decayed and adjusted types use the adjusted type in LLVM and DWARF.
-    return CreateType(
-        cast<PointerType>(cast<AdjustedType>(Ty)->getAdjustedType()), Unit);
-  case Type::BlockPointer:
-    return CreateType(cast<BlockPointerType>(Ty), Unit);
-  case Type::Typedef:
-    return CreateType(cast<TypedefType>(Ty), Unit);
-  case Type::Record:
-    return CreateType(cast<RecordType>(Ty));
-  case Type::Enum:
-    return CreateEnumType(cast<EnumType>(Ty));
-  case Type::FunctionProto:
-  case Type::FunctionNoProto:
-    return CreateType(cast<FunctionType>(Ty), Unit);
-  case Type::ConstantArray:
-  case Type::VariableArray:
-  case Type::IncompleteArray:
-    return CreateType(cast<ArrayType>(Ty), Unit);
-
-  case Type::LValueReference:
-    return CreateType(cast<LValueReferenceType>(Ty), Unit);
-  case Type::RValueReference:
-    return CreateType(cast<RValueReferenceType>(Ty), Unit);
-
-  case Type::MemberPointer:
-    return CreateType(cast<MemberPointerType>(Ty), Unit);
-
-  case Type::Atomic:
-    return CreateType(cast<AtomicType>(Ty), Unit);
-
-  case Type::Pipe:
-    return CreateType(cast<PipeType>(Ty), Unit);
-
-  case Type::TemplateSpecialization:
-    return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
-
-  case Type::Auto:
-  case Type::Attributed:
-  case Type::Elaborated:
-  case Type::Paren:
-  case Type::SubstTemplateTypeParm:
-  case Type::TypeOfExpr:
-  case Type::TypeOf:
-  case Type::Decltype:
-  case Type::UnaryTransform:
-  case Type::PackExpansion:
-    break;
-  }
-
-  llvm_unreachable("type should have been unwrapped!");
-}
-
-llvm::DICompositeType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
-                                                           llvm::DIFile *Unit) {
-  QualType QTy(Ty, 0);
-
-  auto *T = cast_or_null<llvm::DICompositeType>(getTypeOrNull(QTy));
-
-  // We may have cached a forward decl when we could have created
-  // a non-forward decl. Go ahead and create a non-forward decl
-  // now.
-  if (T && !T->isForwardDecl())
-    return T;
-
-  // Otherwise create the type.
-  llvm::DICompositeType *Res = CreateLimitedType(Ty);
-
-  // Propagate members from the declaration to the definition
-  // CreateType(const RecordType*) will overwrite this with the members in the
-  // correct order if the full type is needed.
-  DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());
-
-  // And update the type cache.
-  TypeCache[QTy.getAsOpaquePtr()].reset(Res);
-  return Res;
-}
-
-// TODO: Currently used for context chains when limiting debug info.
-llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
-  RecordDecl *RD = Ty->getDecl();
-
-  // Get overall information about the record type for the debug info.
-  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
-  unsigned Line = getLineNumber(RD->getLocation());
-  StringRef RDName = getClassName(RD);
-
-  llvm::DIScope *RDContext = getDeclContextDescriptor(RD);
-
-  // If we ended up creating the type during the context chain construction,
-  // just return that.
-  auto *T = cast_or_null<llvm::DICompositeType>(
-      getTypeOrNull(CGM.getContext().getRecordType(RD)));
-  if (T && (!T->isForwardDecl() || !RD->getDefinition()))
-    return T;
-
-  // If this is just a forward or incomplete declaration, construct an
-  // appropriately marked node and just return it.
-  const RecordDecl *D = RD->getDefinition();
-  if (!D || !D->isCompleteDefinition())
-    return getOrCreateRecordFwdDecl(Ty, RDContext);
-
-  uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
-
-  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
-
-  llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
-      getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align, 0,
-      FullName);
-
-  RegionMap[Ty->getDecl()].reset(RealDecl);
-  TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);
-
-  if (const ClassTemplateSpecializationDecl *TSpecial =
-          dyn_cast<ClassTemplateSpecializationDecl>(RD))
-    DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
-                           CollectCXXTemplateParams(TSpecial, DefUnit));
-  return RealDecl;
-}
-
-void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
-                                        llvm::DICompositeType *RealDecl) {
-  // A class's primary base or the class itself contains the vtable.
-  llvm::DICompositeType *ContainingType = nullptr;
-  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
-  if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
-    // Seek non-virtual primary base root.
-    while (1) {
-      const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
-      const CXXRecordDecl *PBT = BRL.getPrimaryBase();
-      if (PBT && !BRL.isPrimaryBaseVirtual())
-        PBase = PBT;
-      else
-        break;
-    }
-    ContainingType = cast<llvm::DICompositeType>(
-        getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
-                        getOrCreateFile(RD->getLocation())));
-  } else if (RD->isDynamicClass())
-    ContainingType = RealDecl;
-
-  DBuilder.replaceVTableHolder(RealDecl, ContainingType);
-}
-
-llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
-                                            StringRef Name, uint64_t *Offset) {
-  llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
-  uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
-  unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
-  llvm::DIType *Ty = DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize,
-                                               FieldAlign, *Offset, 0, FieldTy);
-  *Offset += FieldSize;
-  return Ty;
-}
-
 void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
                                            StringRef &Name,
                                            StringRef &LinkageName,
                                            llvm::DIScope *&FDContext,
                                            llvm::DINodeArray &TParamsArray,
                                            unsigned &Flags) {
   const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
   Name = getFunctionName(FD);
if (MI != SPCache.end()) {
       auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
       if (SP && !SP->isDefinition())
         return SP;
     }
   }
   return nullptr;
 }
 
-// getOrCreateFunctionType - Construct type. If it is a c++ method, include
-// implicit parameter "this".
-llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
-                                                             QualType FnType,
-                                                             llvm::DIFile *F) {
-  if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
-    // Create fake but valid subroutine type. Otherwise -verify would fail, and
-    // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
-    return DBuilder.createSubroutineType(DBuilder.getOrCreateTypeArray(None));
-
-  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
-    return getOrCreateMethodType(Method, F);
-  if (const ObjCMethodDecl *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
-    // Add "self" and "_cmd"
-    SmallVector<llvm::Metadata *, 16> Elts;
-
-    // First element is always return type. For 'void' functions it is NULL.
-    QualType ResultTy = OMethod->getReturnType();
-
-    // Replace the instancetype keyword with the actual type.
-    if (ResultTy == CGM.getContext().getObjCInstanceType())
-      ResultTy = CGM.getContext().getPointerType(
-          QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
-
-    Elts.push_back(getOrCreateType(ResultTy, F));
-    // "self" pointer is always first argument.
-    QualType SelfDeclTy;
-    if (auto *SelfDecl = OMethod->getSelfDecl())
-      SelfDeclTy = SelfDecl->getType();
-    else if (auto *FPT = dyn_cast<FunctionProtoType>(FnType))
-      if (FPT->getNumParams() > 1)
-        SelfDeclTy = FPT->getParamType(0);
-    if (!SelfDeclTy.isNull())
-      Elts.push_back(CreateSelfType(SelfDeclTy, getOrCreateType(SelfDeclTy, F)));
-    // "_cmd" pointer is always second argument.
-    Elts.push_back(DBuilder.createArtificialType(
-        getOrCreateType(CGM.getContext().getObjCSelType(), F)));
-    // Get rest of the arguments.
-    for (const auto *PI : OMethod->params())
-      Elts.push_back(getOrCreateType(PI->getType(), F));
-    // Variadic methods need a special marker at the end of the type list.
-    if (OMethod->isVariadic())
-      Elts.push_back(DBuilder.createUnspecifiedParameter());
-
-    llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
-    return DBuilder.createSubroutineType(EltTypeArray);
-  }
-
-  // Handle variadic function types; they need an additional
-  // unspecified parameter.
-  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
-    if (FD->isVariadic()) {
-      SmallVector<llvm::Metadata *, 16> EltTys;
-      EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
-      if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FnType))
-        for (unsigned i = 0, e = FPT->getNumParams(); i != e; ++i)
-          EltTys.push_back(getOrCreateType(FPT->getParamType(i), F));
-      EltTys.push_back(DBuilder.createUnspecifiedParameter());
-      llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
-      return DBuilder.createSubroutineType(EltTypeArray);
-    }
-
-  return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
-}
-
 void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
                                      SourceLocation ScopeLoc, QualType FnType,
                                      llvm::Function *Fn, CGBuilderTy &Builder) {
 
   StringRef Name;
   StringRef LinkageName;
 
   FnBeginRegionCount.push_back(LexicalBlockStack.size());
 
   const Decl *D = GD.getDecl();
   bool HasDecl = (D != nullptr);
void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
   while (LexicalBlockStack.size() != RCount) {
     // Provide an entry in the line table for the end of the block.
     EmitLocation(Builder, CurLoc);
     LexicalBlockStack.pop_back();
   }
   FnBeginRegionCount.pop_back();
 }
 
-llvm::DIType *CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
-                                                        uint64_t *XOffset) {
-
-  SmallVector<llvm::Metadata *, 5> EltTys;
-  QualType FType;
-  uint64_t FieldSize, FieldOffset;
-  unsigned FieldAlign;
-
-  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
-  QualType Type = VD->getType();
-
-  FieldOffset = 0;
-  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
-  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
-  EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
-  FType = CGM.getContext().IntTy;
-  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
-  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
-
-  bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
-  if (HasCopyAndDispose) {
-    FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
-    EltTys.push_back(
-        CreateMemberType(Unit, FType, "__copy_helper", &FieldOffset));
-    EltTys.push_back(
-        CreateMemberType(Unit, FType, "__destroy_helper", &FieldOffset));
-  }
-  bool HasByrefExtendedLayout;
-  Qualifiers::ObjCLifetime Lifetime;
-  if (CGM.getContext().getByrefLifetime(Type, Lifetime,
-                                        HasByrefExtendedLayout) &&
-      HasByrefExtendedLayout) {
-    FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
-    EltTys.push_back(
-        CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
-  }
-
-  CharUnits Align = CGM.getContext().getDeclAlign(VD);
-  if (Align > CGM.getContext().toCharUnitsFromBits(
-                  CGM.getTarget().getPointerAlign(0))) {
-    CharUnits FieldOffsetInBytes =
-        CGM.getContext().toCharUnitsFromBits(FieldOffset);
-    CharUnits AlignedOffsetInBytes = FieldOffsetInBytes.alignTo(Align);
-    CharUnits NumPaddingBytes = AlignedOffsetInBytes - FieldOffsetInBytes;
-
-    if (NumPaddingBytes.isPositive()) {
-      llvm::APInt pad(32, NumPaddingBytes.getQuantity());
-      FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
-                                                    pad, ArrayType::Normal, 0);
-      EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
-    }
-  }
-
-  FType = Type;
-  llvm::DIType *FieldTy = getOrCreateType(FType, Unit);
-  FieldSize = CGM.getContext().getTypeSize(FType);
-  FieldAlign = CGM.getContext().toBits(Align);
-
-  *XOffset = FieldOffset;
-  FieldTy = DBuilder.createMemberType(Unit, VD->getName(), Unit, 0, FieldSize,
-                                      FieldAlign, FieldOffset, 0, FieldTy);
-  EltTys.push_back(FieldTy);
-  FieldOffset += FieldSize;
-
-  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
-
-  unsigned Flags = llvm::DINode::FlagBlockByrefStruct;
-
-  return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
-                                   nullptr, Elements);
-}
-
 void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::Value *Storage,
                               llvm::Optional<unsigned> ArgNo,
                               CGBuilderTy &Builder) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
 
   bool Unwritten =
       VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&

 
 void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
                                             llvm::Value *Storage,
                                             CGBuilderTy &Builder) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   EmitDeclare(VD, Storage, llvm::None, Builder);
 }
 
-llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
-                                          llvm::DIType *Ty) {
-  llvm::DIType *CachedTy = getTypeOrNull(QualTy);
-  if (CachedTy)
-    Ty = CachedTy;
-  return DBuilder.createObjectPointerType(Ty);
-}
-
 void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
     const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
     const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
 
   if (Builder.GetInsertBlock() == nullptr)
     return;

 
 void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
                                            unsigned ArgNo,
                                            CGBuilderTy &Builder) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   EmitDeclare(VD, AI, ArgNo, Builder);
 }
 
-namespace {
-struct BlockLayoutChunk {
-  uint64_t OffsetInBits;
-  const BlockDecl::Capture *Capture;
-};
-bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
-  return l.OffsetInBits < r.OffsetInBits;
-}
-}
-
-void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
-                                                       llvm::Value *Arg,
-                                                       unsigned ArgNo,
-                                                       llvm::Value *LocalAddr,
-                                                       CGBuilderTy &Builder) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  ASTContext &C = CGM.getContext();
-  const BlockDecl *blockDecl = block.getBlockDecl();
-
-  // Collect some general information about the block's location.
-  SourceLocation loc = blockDecl->getCaretLocation();
-  llvm::DIFile *tunit = getOrCreateFile(loc);
-  unsigned line = getLineNumber(loc);
-  unsigned column = getColumnNumber(loc);
-
-  // Build the debug-info type for the block literal.
-  getDeclContextDescriptor(blockDecl);
-
-  const llvm::StructLayout *blockLayout =
-      CGM.getDataLayout().getStructLayout(block.StructureType);
-
-  SmallVector<llvm::Metadata *, 16> fields;
-  fields.push_back(createFieldType("__isa", C.VoidPtrTy, 0, loc, AS_public,
-                                   blockLayout->getElementOffsetInBits(0),
-                                   tunit, tunit));
-  fields.push_back(createFieldType("__flags", C.IntTy, 0, loc, AS_public,
-                                   blockLayout->getElementOffsetInBits(1),
-                                   tunit, tunit));
-  fields.push_back(createFieldType("__reserved", C.IntTy, 0, loc, AS_public,
-                                   blockLayout->getElementOffsetInBits(2),
-                                   tunit, tunit));
-  auto *FnTy = block.getBlockExpr()->getFunctionType();
-  auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
-  fields.push_back(createFieldType("__FuncPtr", FnPtrType, 0, loc, AS_public,
-                                   blockLayout->getElementOffsetInBits(3),
-                                   tunit, tunit));
-  fields.push_back(createFieldType(
-      "__descriptor", C.getPointerType(block.NeedsCopyDispose
-                                           ? C.getBlockDescriptorExtendedType()
-                                           : C.getBlockDescriptorType()),
-      0, loc, AS_public, blockLayout->getElementOffsetInBits(4), tunit, tunit));
-
-  // We want to sort the captures by offset, not because DWARF
-  // requires this, but because we're paranoid about debuggers.
-  SmallVector<BlockLayoutChunk, 8> chunks;
-
-  // 'this' capture.
-  if (blockDecl->capturesCXXThis()) {
-    BlockLayoutChunk chunk;
-    chunk.OffsetInBits =
-        blockLayout->getElementOffsetInBits(block.CXXThisIndex);
-    chunk.Capture = nullptr;
-    chunks.push_back(chunk);
-  }
-
-  // Variable captures.
-  for (const auto &capture : blockDecl->captures()) {
-    const VarDecl *variable = capture.getVariable();
-    const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
-
-    // Ignore constant captures.
-    if (captureInfo.isConstant())
-      continue;
-
-    BlockLayoutChunk chunk;
-    chunk.OffsetInBits =
-        blockLayout->getElementOffsetInBits(captureInfo.getIndex());
-    chunk.Capture = &capture;
-    chunks.push_back(chunk);
-  }
-
-  // Sort by offset.
-  llvm::array_pod_sort(chunks.begin(), chunks.end());
-
-  for (SmallVectorImpl<BlockLayoutChunk>::iterator i = chunks.begin(),
-                                                   e = chunks.end();
-       i != e; ++i) {
-    uint64_t offsetInBits = i->OffsetInBits;
-    const BlockDecl::Capture *capture = i->Capture;
-
-    // If we have a null capture, this must be the C++ 'this' capture.
-    if (!capture) {
-      const CXXMethodDecl *method =
-          cast<CXXMethodDecl>(blockDecl->getNonClosureContext());
-      QualType type = method->getThisType(C);
-
-      fields.push_back(createFieldType("this", type, 0, loc, AS_public,
-                                       offsetInBits, tunit, tunit));
-      continue;
-    }
-
-    const VarDecl *variable = capture->getVariable();
-    StringRef name = variable->getName();
-
-    llvm::DIType *fieldType;
-    if (capture->isByRef()) {
-      TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
-
-      // FIXME: this creates a second copy of this type!
-      uint64_t xoffset;
-      fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
-      fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
-      fieldType =
-          DBuilder.createMemberType(tunit, name, tunit, line, PtrInfo.Width,
-                                    PtrInfo.Align, offsetInBits, 0, fieldType);
-    } else {
-      fieldType = createFieldType(name, variable->getType(), 0, loc, AS_public,
-                                  offsetInBits, tunit, tunit);
-    }
-    fields.push_back(fieldType);
-  }
-
-  SmallString<36> typeName;
-  llvm::raw_svector_ostream(typeName) << "__block_literal_"
-                                      << CGM.getUniqueBlockCount();
-
-  llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);
-
-  llvm::DIType *type = DBuilder.createStructType(
-      tunit, typeName.str(), tunit, line,
-      CGM.getContext().toBits(block.BlockSize),
-      CGM.getContext().toBits(block.BlockAlign), 0, nullptr, fieldsArray);
-  type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
-
-  // Get overall information about the block.
-  unsigned flags = llvm::DINode::FlagArtificial;
-  auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());
-
-  // Create the descriptor for the parameter.
-  auto *debugVar = DBuilder.createParameterVariable(
-      scope, Arg->getName(), ArgNo, tunit, line, type,
-      CGM.getLangOpts().Optimize, flags);
-
-  if (LocalAddr) {
-    // Insert an llvm.dbg.value into the current block.
-    DBuilder.insertDbgValueIntrinsic(
-        LocalAddr, 0, debugVar, DBuilder.createExpression(),
-        llvm::DebugLoc::get(line, column, scope), Builder.GetInsertBlock());
-  }
-
-  // Insert an llvm.dbg.declare into the current block.
-  DBuilder.insertDeclare(Arg, debugVar, DBuilder.createExpression(),
-                         llvm::DebugLoc::get(line, column, scope),
-                         Builder.GetInsertBlock());
-}
-
-llvm::DIDerivedType *
-CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
-  if (!D->isStaticDataMember())
-    return nullptr;
-
-  auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
-  if (MI != StaticDataMemberCache.end()) {
-    assert(MI->second && "Static data member declaration should still exist");
-    return MI->second;
-  }
-
-  // If the member wasn't found in the cache, lazily construct and add it to the
-  // type (used when a limited form of the type is emitted).
-  auto DC = D->getDeclContext();
-  auto *Ctxt = cast<llvm::DICompositeType>(getDeclContextDescriptor(D));
-  return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
-}
-
-llvm::DIGlobalVariable *CGDebugInfo::CollectAnonRecordDecls(
-    const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
-    StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
-  llvm::DIGlobalVariable *GV = nullptr;
-
-  for (const auto *Field : RD->fields()) {
-    llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
-    StringRef FieldName = Field->getName();
-
-    // Ignore unnamed fields, but recurse into anonymous records.
-    if (FieldName.empty()) {
-      const RecordType *RT = dyn_cast<RecordType>(Field->getType());
-      if (RT)
-        GV = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
-                                    Var, DContext);
-      continue;
-    }
-    // Use VarDecl's Tag, Scope and Line number.
-    GV = DBuilder.createGlobalVariable(DContext, FieldName, LinkageName, Unit,
-                                       LineNo, FieldTy,
-                                       Var->hasInternalLinkage(), Var, nullptr);
-  }
-  return GV;
-}
-
 void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
                                      const VarDecl *D) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   // Create global variable debug descriptor.
   llvm::DIFile *Unit = nullptr;
   llvm::DIScope *DContext = nullptr;
   unsigned LineNo;
   StringRef DeclName, LinkageName;
void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
   if (isa<FunctionDecl>(VD->getDeclContext()))
     return;
   VD = cast<ValueDecl>(VD->getCanonicalDecl());
   auto *VarD = cast<VarDecl>(VD);
   if (VarD->isStaticDataMember()) {
     auto *RD = cast<RecordDecl>(VarD->getDeclContext());
     getDeclContextDescriptor(VarD);
     // Ensure that the type is retained even though it's otherwise unreferenced.
-    RetainedTypes.push_back(
-        CGM.getContext().getRecordType(RD).getAsOpaquePtr());
+    retainType(CGM.getContext().getRecordType(RD).getAsOpaquePtr());
     return;
   }
 
   llvm::DIScope *DContext = getDeclContextDescriptor(VD);
 
   auto &GV = DeclCache[VD];
   if (GV)
     return;
   GV.reset(DBuilder.createGlobalVariable(
       DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
       true, Init, getOrCreateStaticDataMemberDeclarationOrNull(VarD)));
 }
 
 llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
   if (!LexicalBlockStack.empty())
     return LexicalBlockStack.back();
   llvm::DIScope *Mod = getParentModuleOrNull(D);
   return getContextDescriptor(D, Mod ? Mod : TheCU);
 }
 
-void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
-  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
-    return;
-  const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
-  if (!NSDecl->isAnonymousNamespace() || 
-      CGM.getCodeGenOpts().DebugExplicitImport) { 
-    DBuilder.createImportedModule(
-        getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
-        getOrCreateNameSpace(NSDecl),
-        getLineNumber(UD.getLocation()));
-  }
-}
-
-void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
-  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
-    return;
-  assert(UD.shadow_size() &&
-         "We shouldn't be codegening an invalid UsingDecl containing no decls");
-  // Emitting one decl is sufficient - debuggers can detect that this is an
-  // overloaded name & provide lookup for all the overloads.
-  const UsingShadowDecl &USD = **UD.shadow_begin();
-  if (llvm::DINode *Target =
-          getDeclarationOrDefinition(USD.getUnderlyingDecl()))
-    DBuilder.createImportedDeclaration(
-        getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
-        getLineNumber(USD.getLocation()));
-}
-
-void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
-  if (Module *M = ID.getImportedModule()) {
-    auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
-    DBuilder.createImportedDeclaration(
-        getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
-        getOrCreateModuleRef(Info, DebugTypeExtRefs),
-        getLineNumber(ID.getLocation()));
-  }
-}
-
-llvm::DIImportedEntity *
-CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
-  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
-    return nullptr;
-  auto &VH = NamespaceAliasCache[&NA];
-  if (VH)
-    return cast<llvm::DIImportedEntity>(VH);
-  llvm::DIImportedEntity *R;
-  if (const NamespaceAliasDecl *Underlying =
-          dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
-    // This could cache & dedup here rather than relying on metadata deduping.
-    R = DBuilder.createImportedDeclaration(
-        getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
-        EmitNamespaceAlias(*Underlying), getLineNumber(NA.getLocation()),
-        NA.getName());
-  else
-    R = DBuilder.createImportedDeclaration(
-        getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
-        getOrCreateNameSpace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
-        getLineNumber(NA.getLocation()), NA.getName());
-  VH.reset(R);
-  return R;
-}
-
-llvm::DINamespace *
-CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
-  NSDecl = NSDecl->getCanonicalDecl();
-  auto I = NameSpaceCache.find(NSDecl);
-  if (I != NameSpaceCache.end())
-    return cast<llvm::DINamespace>(I->second);
-
-  unsigned LineNo = getLineNumber(NSDecl->getLocation());
-  llvm::DIFile *FileD = getOrCreateFile(NSDecl->getLocation());
-  llvm::DIScope *Context = getDeclContextDescriptor(NSDecl);
-  llvm::DINamespace *NS =
-      DBuilder.createNameSpace(Context, NSDecl->getName(), FileD, LineNo);
-  NameSpaceCache[NSDecl].reset(NS);
-  return NS;
-}
-
-void CGDebugInfo::setDwoId(uint64_t Signature) {
-  assert(TheCU && "no main compile unit");
-  TheCU->setDWOId(Signature);
-}
-
-
 void CGDebugInfo::finalize() {
-  // Creating types might create further types - invalidating the current
-  // element and the size(), so don't cache/reference them.
-  for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
-    ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
-    llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
-                           ? CreateTypeDefinition(E.Type, E.Unit)
-                           : E.Decl;
-    DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
-  }
-
-  for (auto p : ReplaceMap) {
-    assert(p.second);
-    auto *Ty = cast<llvm::DIType>(p.second);
-    assert(Ty->isForwardDecl());
-
-    auto it = TypeCache.find(p.first);
-    assert(it != TypeCache.end());
-    assert(it->second);
-
-    DBuilder.replaceTemporary(llvm::TempDIType(Ty),
-                              cast<llvm::DIType>(it->second));
-  }
-
   for (const auto &p : FwdDeclReplaceMap) {
     assert(p.second);
     llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(p.second));
     llvm::Metadata *Repl;
 
     auto it = DeclCache.find(p.first);
     // If there has been no definition for the declaration, call RAUW
     // with ourselves, that will destroy the temporary MDNode and
     // replace it with a standard one, avoiding leaking memory.
     if (it == DeclCache.end())
       Repl = p.second;
     else
       Repl = it->second;
 
     DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
   }
 
-  // We keep our own list of retained types, because we need to look
-  // up the final type in the type cache.
-  for (auto &RT : RetainedTypes)
-    if (auto MD = TypeCache[RT])
-      DBuilder.retainType(cast<llvm::DIType>(MD));
-
   DBuilder.finalize();
 }
-
-void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
-  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
-    return;
-
-  if (auto *DieTy = getOrCreateType(Ty, getOrCreateMainFile()))
-    // Don't ignore in case of explicit cast where it is referenced indirectly.
-    DBuilder.retainType(DieTy);
-}

lib/CodeGen/CMakeLists.txt

add_clang_library(clangCodeGen
   CGCUDABuiltin.cpp
   CGCUDANV.cpp
   CGCUDARuntime.cpp
   CGCXX.cpp
   CGCXXABI.cpp
   CGCall.cpp
   CGClass.cpp
   CGCleanup.cpp
+  CGDebugDwarf.cpp
   CGDebugInfo.cpp
   CGDecl.cpp
   CGDeclCXX.cpp
   CGException.cpp
   CGExpr.cpp
   CGExprAgg.cpp
   CGExprCXX.cpp
   CGExprComplex.cpp

lib/CodeGen/CodeGenModule.h

private:
  
   /// Holds information about C++ vtables.
   CodeGenVTables VTables;
 
   CGObjCRuntime* ObjCRuntime;
   CGOpenCLRuntime* OpenCLRuntime;
   CGOpenMPRuntime* OpenMPRuntime;
   CGCUDARuntime* CUDARuntime;
-  CGDebugInfo* DebugInfo;
+  std::unique_ptr<CGDebugInfo> DebugInfo;
   ObjCEntrypoints *ObjCData;
   llvm::MDNode *NoObjCARCExceptionsMetadata;
   std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader;
   InstrProfStats PGOStats;
   std::unique_ptr<llvm::SanitizerStatReport> SanStats;
 
   // A set of references that have only been seen via a weakref so far. This is
   // used to remove the weak of the reference if we ever see a direct reference
public:
 
   llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
     return TypeDescriptorMap[Ty];
   }
   void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
     TypeDescriptorMap[Ty] = C;
   }
 
-  CGDebugInfo *getModuleDebugInfo() { return DebugInfo; }
+  CGDebugInfo *getModuleDebugInfo() { return DebugInfo.get(); }
 
   llvm::MDNode *getNoObjCARCExceptionsMetadata() {
     if (!NoObjCARCExceptionsMetadata)
       NoObjCARCExceptionsMetadata = llvm::MDNode::get(getLLVMContext(), None);
     return NoObjCARCExceptionsMetadata;
   }
 
   ASTContext &getContext() const { return Context; }

lib/CodeGen/CodeGenModule.cpp

 //
 //===----------------------------------------------------------------------===//
 
 #include "CodeGenModule.h"
 #include "CGBlocks.h"
 #include "CGCUDARuntime.h"
 #include "CGCXXABI.h"
 #include "CGCall.h"
+#include "CGDebugDwarf.h"
 #include "CGDebugInfo.h"
 #include "CGObjCRuntime.h"
 #include "CGOpenCLRuntime.h"
 #include "CGOpenMPRuntime.h"
 #include "CGOpenMPRuntimeNVPTX.h"
 #include "CodeGenFunction.h"
 #include "CodeGenPGO.h"
 #include "CodeGenTBAA.h"
if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
       (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
     TBAA = new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
                            getCXXABI().getMangleContext());
 
   // If debug info or coverage generation is enabled, create the CGDebugInfo
   // object.
   if (CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo ||
       CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes)
-    DebugInfo = new CGDebugInfo(*this);
+    DebugInfo.reset(new CGDebugDwarf(*this));
 
   Block.GlobalUniqueCount = 0;
 
   if (C.getLangOpts().ObjC1)
     ObjCData = new ObjCEntrypoints();
 
   if (CodeGenOpts.hasProfileClangUse()) {
     auto ReaderOrErr = llvm::IndexedInstrProfReader::create(

 
 CodeGenModule::~CodeGenModule() {
   delete ObjCRuntime;
   delete OpenCLRuntime;
   delete OpenMPRuntime;
   delete CUDARuntime;
   delete TheTargetCodeGenInfo;
   delete TBAA;
-  delete DebugInfo;
   delete ObjCData;
 }
 
 void CodeGenModule::createObjCRuntime() {
   // This is just isGNUFamily(), but we want to force implementors of
   // new ABIs to decide how best to do this.
   switch (LangOpts.ObjCRuntime.getKind()) {
   case ObjCRuntime::GNUstep: