diff --git a/include/llvm/DebugInfo/CodeView/Formatters.h b/include/llvm/DebugInfo/CodeView/Formatters.h
index 1fbb0dd6f9b..0842c1e373d 100644
--- a/include/llvm/DebugInfo/CodeView/Formatters.h
+++ b/include/llvm/DebugInfo/CodeView/Formatters.h
@@ -14,21 +14,27 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
 #include "llvm/Support/FormatAdapters.h"
-#include "llvm/Support/FormatProviders.h"
 #include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdint>
 
 namespace llvm {
+
 namespace codeview {
+
 namespace detail {
-class GuidAdapter final : public llvm::FormatAdapter<ArrayRef<uint8_t>> {
+
+class GuidAdapter final : public FormatAdapter<ArrayRef<uint8_t>> {
   ArrayRef<uint8_t> Guid;
 
 public:
   explicit GuidAdapter(ArrayRef<uint8_t> Guid);
   explicit GuidAdapter(StringRef Guid);
-  void format(llvm::raw_ostream &Stream, StringRef Style);
+
+  void format(raw_ostream &Stream, StringRef Style) override ;
 };
-}
+
+} // end namespace detail
 
 inline detail::GuidAdapter fmt_guid(StringRef Item) {
   return detail::GuidAdapter(Item);
@@ -37,11 +43,12 @@ inline detail::GuidAdapter fmt_guid(StringRef Item) {
 inline detail::GuidAdapter fmt_guid(ArrayRef<uint8_t> Item) {
   return detail::GuidAdapter(Item);
 }
-}
+
+} // end namespace codeview
 
 template <> struct format_provider<codeview::TypeIndex> {
 public:
-  static void format(const codeview::TypeIndex &V, llvm::raw_ostream &Stream,
+  static void format(const codeview::TypeIndex &V, raw_ostream &Stream,
                      StringRef Style) {
     if (V.isNoneType())
       Stream << "<no type>";
@@ -52,6 +59,7 @@ public:
     }
   }
 };
-}
 
-#endif
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_FORMATTERS_H
diff --git a/include/llvm/DebugInfo/CodeView/StringsAndChecksums.h b/include/llvm/DebugInfo/CodeView/StringsAndChecksums.h
index 708b317164f..1a838822466 100644
--- a/include/llvm/DebugInfo/CodeView/StringsAndChecksums.h
+++ b/include/llvm/DebugInfo/CodeView/StringsAndChecksums.h
@@ -7,23 +7,18 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DEBUGINFO_CODEVIEW_STRINGS_AND_CHECKSUMS_H
-#define LLVM_DEBUGINFO_CODEVIEW_STRINGS_AND_CHECKSUMS_H
+#ifndef LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
+#define LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
 
 #include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
+#include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
 #include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
-
 #include <memory>
 
 namespace llvm {
 namespace codeview {
 
-class DebugSubsectionRecord;
-class DebugChecksumsSubsectionRef;
-class DebugStringTableSubsectionRef;
-class DebugChecksumsSubsection;
-class DebugStringTableSubsection;
-
 class StringsAndChecksumsRef {
 public:
   // If no subsections are known about initially, we find as much as we can.
@@ -83,8 +78,9 @@ class StringsAndChecksums {
 public:
   using StringsPtr = std::shared_ptr<DebugStringTableSubsection>;
   using ChecksumsPtr = std::shared_ptr<DebugChecksumsSubsection>;
+
   // If no subsections are known about initially, we find as much as we can.
-  StringsAndChecksums() {}
+  StringsAndChecksums() = default;
 
   void setStrings(const StringsPtr &SP) { Strings = SP; }
   void setChecksums(const ChecksumsPtr &CP) { Checksums = CP; }
@@ -100,7 +96,7 @@ private:
   ChecksumsPtr Checksums;
 };
 
-} // namespace codeview
-} // namespace llvm
+} // end namespace codeview
+} // end namespace llvm
 
-#endif
+#endif // LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
diff --git a/include/llvm/DebugInfo/CodeView/SymbolSerializer.h b/include/llvm/DebugInfo/CodeView/SymbolSerializer.h
index 42adbdb4e20..b63ced5217b 100644
--- a/include/llvm/DebugInfo/CodeView/SymbolSerializer.h
+++ b/include/llvm/DebugInfo/CodeView/SymbolSerializer.h
@@ -1,4 +1,4 @@
-//===- symbolSerializer.h ---------------------------------------*- C++ -*-===//
+//===- SymbolSerializer.h ---------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -10,21 +10,20 @@
 #ifndef LLVM_DEBUGINFO_CODEVIEW_SYMBOLSERIALIZER_H
 #define LLVM_DEBUGINFO_CODEVIEW_SYMBOLSERIALIZER_H
 
+#include "llvm/ADT/Optional.h"
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/RecordSerialization.h"
+#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
 #include "llvm/DebugInfo/CodeView/SymbolRecordMapping.h"
 #include "llvm/DebugInfo/CodeView/SymbolVisitorCallbacks.h"
-
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/iterator_range.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/BinaryByteStream.h"
 #include "llvm/Support/BinaryStreamWriter.h"
 #include "llvm/Support/Error.h"
+#include <cstdint>
+#include <vector>
 
 namespace llvm {
-class BinaryStreamWriter;
 namespace codeview {
 
 class SymbolSerializer : public SymbolVisitorCallbacks {
@@ -45,6 +44,8 @@ class SymbolSerializer : public SymbolVisitorCallbacks {
   }
 
 public:
+  SymbolSerializer(BumpPtrAllocator &Storage, CodeViewContainer Container);
+
   template <typename SymType>
   static CVSymbol writeOneSymbol(SymType &Sym, BumpPtrAllocator &Storage,
                                  CodeViewContainer Container) {
@@ -57,13 +58,11 @@ public:
     return Result;
   }
 
-  SymbolSerializer(BumpPtrAllocator &Storage, CodeViewContainer Container);
-
-  virtual Error visitSymbolBegin(CVSymbol &Record) override;
-  virtual Error visitSymbolEnd(CVSymbol &Record) override;
+  Error visitSymbolBegin(CVSymbol &Record) override;
+  Error visitSymbolEnd(CVSymbol &Record) override;
 
 #define SYMBOL_RECORD(EnumName, EnumVal, Name)                                 \
-  virtual Error visitKnownRecord(CVSymbol &CVR, Name &Record) override {       \
+  Error visitKnownRecord(CVSymbol &CVR, Name &Record) override {               \
     return visitKnownRecordImpl(CVR, Record);                                  \
   }
 #define SYMBOL_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
@@ -75,7 +74,8 @@ private:
     return Mapping.visitKnownRecord(CVR, Record);
   }
 };
-}
-}
 
-#endif
+} // end namespace codeview
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_SYMBOLSERIALIZER_H
diff --git a/include/llvm/DebugInfo/CodeView/TypeServerHandler.h b/include/llvm/DebugInfo/CodeView/TypeServerHandler.h
index 35f06eaf6eb..e96baad9cea 100644
--- a/include/llvm/DebugInfo/CodeView/TypeServerHandler.h
+++ b/include/llvm/DebugInfo/CodeView/TypeServerHandler.h
@@ -10,16 +10,17 @@
 #ifndef LLVM_DEBUGINFO_CODEVIEW_TYPESERVERHANDLER_H
 #define LLVM_DEBUGINFO_CODEVIEW_TYPESERVERHANDLER_H
 
-#include "llvm/DebugInfo/CodeView/TypeRecord.h"
 #include "llvm/Support/Error.h"
 
 namespace llvm {
 namespace codeview {
+
+class TypeServer2Record;
 class TypeVisitorCallbacks;
 
 class TypeServerHandler {
 public:
-  virtual ~TypeServerHandler() {}
+  virtual ~TypeServerHandler() = default;
 
   /// Handle a TypeServer record.  If the implementation returns true
   /// the record will not be processed by the top-level visitor.  If
@@ -30,7 +31,8 @@ public:
     return false;
   }
 };
-}
-}
 
-#endif
+} // end namespace codeview
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_TYPESERVERHANDLER_H
diff --git a/include/llvm/DebugInfo/PDB/IPDBDataStream.h b/include/llvm/DebugInfo/PDB/IPDBDataStream.h
index 9594dc1591a..67b5a06d7c5 100644
--- a/include/llvm/DebugInfo/PDB/IPDBDataStream.h
+++ b/include/llvm/DebugInfo/PDB/IPDBDataStream.h
@@ -1,4 +1,4 @@
-//===- IPDBDataStream.h - base interface for child enumerator -*- C++ ---*-===//
+//===- IPDBDataStream.h - base interface for child enumerator ---*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -10,9 +10,10 @@
 #ifndef LLVM_DEBUGINFO_PDB_IPDBDATASTREAM_H
 #define LLVM_DEBUGINFO_PDB_IPDBDATASTREAM_H
 
-#include "PDBTypes.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
+#include <cstdint>
+#include <string>
 
 namespace llvm {
 namespace pdb {
@@ -22,18 +23,19 @@ namespace pdb {
 /// stream type.
 class IPDBDataStream {
 public:
-  typedef llvm::SmallVector<uint8_t, 32> RecordType;
+  using RecordType = SmallVector<uint8_t, 32>;
 
   virtual ~IPDBDataStream();
 
   virtual uint32_t getRecordCount() const = 0;
   virtual std::string getName() const = 0;
-  virtual llvm::Optional<RecordType> getItemAtIndex(uint32_t Index) const = 0;
+  virtual Optional<RecordType> getItemAtIndex(uint32_t Index) const = 0;
   virtual bool getNext(RecordType &Record) = 0;
   virtual void reset() = 0;
   virtual IPDBDataStream *clone() const = 0;
 };
-}
-}
 
-#endif
+} // end namespace pdb
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_IPDBDATASTREAM_H
diff --git a/include/llvm/DebugInfo/PDB/IPDBEnumChildren.h b/include/llvm/DebugInfo/PDB/IPDBEnumChildren.h
index e48dc250822..b6b7d95f628 100644
--- a/include/llvm/DebugInfo/PDB/IPDBEnumChildren.h
+++ b/include/llvm/DebugInfo/PDB/IPDBEnumChildren.h
@@ -18,8 +18,8 @@ namespace pdb {
 
 template <typename ChildType> class IPDBEnumChildren {
 public:
-  typedef std::unique_ptr<ChildType> ChildTypePtr;
-  typedef IPDBEnumChildren<ChildType> MyType;
+  using ChildTypePtr = std::unique_ptr<ChildType>;
+  using MyType = IPDBEnumChildren<ChildType>;
 
   virtual ~IPDBEnumChildren() = default;
 
diff --git a/include/llvm/DebugInfo/PDB/Native/DbiModuleList.h b/include/llvm/DebugInfo/PDB/Native/DbiModuleList.h
index 2885081628f..5f6e7ab92a9 100644
--- a/include/llvm/DebugInfo/PDB/Native/DbiModuleList.h
+++ b/include/llvm/DebugInfo/PDB/Native/DbiModuleList.h
@@ -7,22 +7,23 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DEBUGINFO_PDB_RAW_DBIMODULELIST_H
-#define LLVM_DEBUGINFO_PDB_RAW_DBIMODULELIST_H
+#ifndef LLVM_DEBUGINFO_PDB_NATIVE_DBIMODULELIST_H
+#define LLVM_DEBUGINFO_PDB_NATIVE_DBIMODULELIST_H
 
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator.h"
-#include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
+#include "llvm/ADT/iterator_range.h"
 #include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h"
 #include "llvm/Support/BinaryStreamArray.h"
 #include "llvm/Support/BinaryStreamRef.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
+#include <cstddef>
 #include <cstdint>
+#include <iterator>
 #include <vector>
 
 namespace llvm {
-namespace codeview {}
 namespace pdb {
 
 class DbiModuleList;
@@ -31,9 +32,9 @@ struct FileInfoSubstreamHeader;
 class DbiModuleSourceFilesIterator
     : public iterator_facade_base<DbiModuleSourceFilesIterator,
                                   std::random_access_iterator_tag, StringRef> {
-  typedef iterator_facade_base<DbiModuleSourceFilesIterator,
-                               std::random_access_iterator_tag, StringRef>
-      BaseType;
+  using BaseType =
+      iterator_facade_base<DbiModuleSourceFilesIterator,
+                           std::random_access_iterator_tag, StringRef>;
 
 public:
   DbiModuleSourceFilesIterator(const DbiModuleList &Modules, uint32_t Modi,
@@ -110,7 +111,8 @@ private:
   BinaryStreamRef FileInfoSubstream;
   BinaryStreamRef NamesBuffer;
 };
-}
-}
 
-#endif // LLVM_DEBUGINFO_PDB_RAW_DBIMODULELIST_H
\ No newline at end of file
+} // end namespace pdb
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_NATIVE_DBIMODULELIST_H
diff --git a/include/llvm/DebugInfo/PDB/Native/Hash.h b/include/llvm/DebugInfo/PDB/Native/Hash.h
index 0340554d7b0..1f11d43ecdd 100644
--- a/include/llvm/DebugInfo/PDB/Native/Hash.h
+++ b/include/llvm/DebugInfo/PDB/Native/Hash.h
@@ -7,19 +7,21 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DEBUGINFO_PDB_RAW_HASH_H
-#define LLVM_DEBUGINFO_PDB_RAW_HASH_H
+#ifndef LLVM_DEBUGINFO_PDB_NATIVE_HASH_H
+#define LLVM_DEBUGINFO_PDB_NATIVE_HASH_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
-#include <stdint.h>
+#include <cstdint>
 
 namespace llvm {
 namespace pdb {
+
 uint32_t hashStringV1(StringRef Str);
 uint32_t hashStringV2(StringRef Str);
 uint32_t hashBufferV8(ArrayRef<uint8_t> Data);
-}
-}
 
-#endif
+} // end namespace pdb
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_NATIVE_HASH_H
diff --git a/include/llvm/DebugInfo/PDB/Native/HashTable.h b/include/llvm/DebugInfo/PDB/Native/HashTable.h
index 46eefa968e5..05c70c4f217 100644
--- a/include/llvm/DebugInfo/PDB/Native/HashTable.h
+++ b/include/llvm/DebugInfo/PDB/Native/HashTable.h
@@ -7,36 +7,36 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DEBUGINFO_PDB_RAW_HASHTABLE_H
-#define LLVM_DEBUGINFO_PDB_RAW_HASHTABLE_H
+#ifndef LLVM_DEBUGINFO_PDB_NATIVE_HASHTABLE_H
+#define LLVM_DEBUGINFO_PDB_NATIVE_HASHTABLE_H
 
-#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SparseBitVector.h"
-#include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator.h"
-#include "llvm/Support/BinaryStreamArray.h"
-#include "llvm/Support/BinaryStreamReader.h"
-#include "llvm/Support/BinaryStreamWriter.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
-#include "llvm/Support/MathExtras.h"
-
 #include <cstdint>
+#include <iterator>
 #include <utility>
+#include <vector>
 
 namespace llvm {
+
+class BinaryStreamReader;
+class BinaryStreamWriter;
+
 namespace pdb {
 
 class HashTableIterator;
 
 class HashTable {
   friend class HashTableIterator;
+
   struct Header {
     support::ulittle32_t Size;
     support::ulittle32_t Capacity;
   };
 
-  typedef std::vector<std::pair<uint32_t, uint32_t>> BucketList;
+  using BucketList = std::vector<std::pair<uint32_t, uint32_t>>;
 
 public:
   HashTable();
@@ -63,6 +63,7 @@ public:
 protected:
   bool isPresent(uint32_t K) const { return Present.test(K); }
   bool isDeleted(uint32_t K) const { return Deleted.test(K); }
+
   BucketList Buckets;
   mutable SparseBitVector<> Present;
   mutable SparseBitVector<> Deleted;
@@ -81,6 +82,7 @@ class HashTableIterator
     : public iterator_facade_base<HashTableIterator, std::forward_iterator_tag,
                                   std::pair<uint32_t, uint32_t>> {
   friend class HashTable;
+
   HashTableIterator(const HashTable &Map, uint32_t Index, bool IsEnd);
 
 public:
@@ -101,6 +103,7 @@ private:
 };
 
 } // end namespace pdb
+
 } // end namespace llvm
 
-#endif // LLVM_DEBUGINFO_PDB_RAW_HASHTABLE_H
+#endif // LLVM_DEBUGINFO_PDB_NATIVE_HASHTABLE_H
diff --git a/include/llvm/DebugInfo/PDB/Native/ModuleDebugStream.h b/include/llvm/DebugInfo/PDB/Native/ModuleDebugStream.h
index 5565cd5582b..f413fd1b336 100644
--- a/include/llvm/DebugInfo/PDB/Native/ModuleDebugStream.h
+++ b/include/llvm/DebugInfo/PDB/Native/ModuleDebugStream.h
@@ -1,4 +1,4 @@
-//===- ModuleDebugStream.h - PDB Module Info Stream Access ----------------===//
+//===- ModuleDebugStream.h - PDB Module Info Stream Access ------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -7,26 +7,26 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DEBUGINFO_PDB_RAW_MODULEDEBUGSTREAM_H
-#define LLVM_DEBUGINFO_PDB_RAW_MODULEDEBUGSTREAM_H
+#ifndef LLVM_DEBUGINFO_PDB_NATIVE_MODULEDEBUGSTREAM_H
+#define LLVM_DEBUGINFO_PDB_NATIVE_MODULEDEBUGSTREAM_H
 
 #include "llvm/ADT/iterator_range.h"
-#include "llvm/DebugInfo/CodeView/CVRecord.h"
 #include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
 #include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
 #include "llvm/DebugInfo/MSF/MappedBlockStream.h"
-#include "llvm/Support/BinaryStreamArray.h"
 #include "llvm/Support/BinaryStreamRef.h"
 #include "llvm/Support/Error.h"
+#include <cstdint>
+#include <memory>
 
 namespace llvm {
 namespace pdb {
-class PDBFile;
+
 class DbiModuleDescriptor;
 
 class ModuleDebugStreamRef {
-  typedef codeview::DebugSubsectionArray::Iterator DebugSubsectionIterator;
+  using DebugSubsectionIterator = codeview::DebugSubsectionArray::Iterator;
 
 public:
   ModuleDebugStreamRef(const DbiModuleDescriptor &Module,
@@ -50,7 +50,7 @@ public:
 
   ModuleDebugStreamRef &operator=(ModuleDebugStreamRef &&Other) = default;
 
-  llvm::iterator_range<DebugSubsectionIterator> subsections() const;
+  iterator_range<DebugSubsectionIterator> subsections() const;
 
   bool hasDebugSubsections() const;
 
@@ -75,7 +75,8 @@ private:
 
   codeview::DebugSubsectionArray Subsections;
 };
-}
-}
 
-#endif
+} // end namespace pdb
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_NATIVE_MODULEDEBUGSTREAM_H
diff --git a/include/llvm/DebugInfo/PDB/Native/ModuleDebugStreamBuilder.h b/include/llvm/DebugInfo/PDB/Native/ModuleDebugStreamBuilder.h
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/include/llvm/DebugInfo/PDB/Native/NamedStreamMap.h b/include/llvm/DebugInfo/PDB/Native/NamedStreamMap.h
index d4206503e7d..25f66240a6a 100644
--- a/include/llvm/DebugInfo/PDB/Native/NamedStreamMap.h
+++ b/include/llvm/DebugInfo/PDB/Native/NamedStreamMap.h
@@ -7,27 +7,31 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DEBUGINFO_PDB_RAW_PDBNAMEDSTREAMMAP_H
-#define LLVM_DEBUGINFO_PDB_RAW_PDBNAMEDSTREAMMAP_H
+#ifndef LLVM_DEBUGINFO_PDB_NATIVE_NAMEDSTREAMMAP_H
+#define LLVM_DEBUGINFO_PDB_NATIVE_NAMEDSTREAMMAP_H
 
+#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/iterator_range.h"
 #include "llvm/DebugInfo/PDB/Native/HashTable.h"
 #include "llvm/Support/Error.h"
 #include <cstdint>
 
 namespace llvm {
+
 class BinaryStreamReader;
 class BinaryStreamWriter;
 
 namespace pdb {
-class NamedStreamMapBuilder;
+
 class NamedStreamMap {
+  friend class NamedStreamMapBuilder;
+
   struct FinalizationInfo {
     uint32_t StringDataBytes = 0;
     uint32_t SerializedLength = 0;
   };
-  friend NamedStreamMapBuilder;
 
 public:
   NamedStreamMap();
@@ -50,6 +54,7 @@ private:
 };
 
 } // end namespace pdb
+
 } // end namespace llvm
 
-#endif // LLVM_DEBUGINFO_PDB_RAW_PDBNAMEDSTREAMMAP_H
+#endif // LLVM_DEBUGINFO_PDB_NATIVE_NAMEDSTREAMMAP_H
diff --git a/include/llvm/DebugInfo/PDB/Native/NativeRawSymbol.h b/include/llvm/DebugInfo/PDB/Native/NativeRawSymbol.h
index 5e4aaafff1a..a24a972879d 100644
--- a/include/llvm/DebugInfo/PDB/Native/NativeRawSymbol.h
+++ b/include/llvm/DebugInfo/PDB/Native/NativeRawSymbol.h
@@ -1,4 +1,4 @@
-//===- NativeRawSymbol.h - Native implementation of IPDBRawSymbol - C++ -*-===//
+//==- NativeRawSymbol.h - Native implementation of IPDBRawSymbol -*- C++ -*-==//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -11,6 +11,8 @@
 #define LLVM_DEBUGINFO_PDB_NATIVE_NATIVERAWSYMBOL_H
 
 #include "llvm/DebugInfo/PDB/IPDBRawSymbol.h"
+#include <cstdint>
+#include <memory>
 
 namespace llvm {
 namespace pdb {
@@ -36,7 +38,7 @@ public:
   std::unique_ptr<IPDBEnumSymbols>
     findInlineFramesByRVA(uint32_t RVA) const override;
 
-  void getDataBytes(llvm::SmallVector<uint8_t, 32> &Bytes) const override;
+  void getDataBytes(SmallVector<uint8_t, 32> &Bytes) const override;
   void getFrontEndVersion(VersionInfo &Version) const override;
   void getBackEndVersion(VersionInfo &Version) const override;
   PDB_MemberAccess getAccess() const override;
@@ -206,7 +208,7 @@ protected:
   uint32_t SymbolId;
 };
 
-}
-}
+} // end namespace pdb
+} // end namespace llvm
 
-#endif
+#endif // LLVM_DEBUGINFO_PDB_NATIVE_NATIVERAWSYMBOL_H
diff --git a/include/llvm/DebugInfo/PDB/PDB.h b/include/llvm/DebugInfo/PDB/PDB.h
index 1f5a066b9a1..9f9da39ca6c 100644
--- a/include/llvm/DebugInfo/PDB/PDB.h
+++ b/include/llvm/DebugInfo/PDB/PDB.h
@@ -10,21 +10,23 @@
 #ifndef LLVM_DEBUGINFO_PDB_PDB_H
 #define LLVM_DEBUGINFO_PDB_PDB_H
 
-#include "PDBTypes.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/PDB/PDBTypes.h"
 #include "llvm/Support/Error.h"
 #include <memory>
-#include <system_error>
 
 namespace llvm {
-class StringRef;
-
 namespace pdb {
 
+class IPDBSession;
+
 Error loadDataForPDB(PDB_ReaderType Type, StringRef Path,
                      std::unique_ptr<IPDBSession> &Session);
 
 Error loadDataForEXE(PDB_ReaderType Type, StringRef Path,
                      std::unique_ptr<IPDBSession> &Session);
-}
-}
-#endif
+
+} // end namespace pdb
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_PDB_H
diff --git a/include/llvm/DebugInfo/PDB/PDBExtras.h b/include/llvm/DebugInfo/PDB/PDBExtras.h
index fc5787556a6..3a38f21b94c 100644
--- a/include/llvm/DebugInfo/PDB/PDBExtras.h
+++ b/include/llvm/DebugInfo/PDB/PDBExtras.h
@@ -1,4 +1,4 @@
-//===- PDBExtras.h - helper functions and classes for PDBs -------*- C++-*-===//
+//===- PDBExtras.h - helper functions and classes for PDBs ------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -10,15 +10,17 @@
 #ifndef LLVM_DEBUGINFO_PDB_PDBEXTRAS_H
 #define LLVM_DEBUGINFO_PDB_PDBEXTRAS_H
 
-#include "PDBTypes.h"
 #include "llvm/DebugInfo/CodeView/CodeView.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/DebugInfo/PDB/PDBTypes.h"
 #include <unordered_map>
 
 namespace llvm {
 
+class raw_ostream;
+
 namespace pdb {
-typedef std::unordered_map<PDB_SymType, int> TagStats;
+
+using TagStats = std::unordered_map<PDB_SymType, int>;
 
 raw_ostream &operator<<(raw_ostream &OS, const PDB_VariantType &Value);
 raw_ostream &operator<<(raw_ostream &OS, const PDB_CallingConv &Conv);
@@ -37,7 +39,9 @@ raw_ostream &operator<<(raw_ostream &OS, const PDB_Machine &Machine);
 raw_ostream &operator<<(raw_ostream &OS, const Variant &Value);
 raw_ostream &operator<<(raw_ostream &OS, const VersionInfo &Version);
 raw_ostream &operator<<(raw_ostream &OS, const TagStats &Stats);
-}
-}
 
-#endif
+} // end namespace pdb
+
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_PDBEXTRAS_H
diff --git a/include/llvm/DebugInfo/PDB/PDBTypes.h b/include/llvm/DebugInfo/PDB/PDBTypes.h
index dd2fc4f2c55..79ec7ce906d 100644
--- a/include/llvm/DebugInfo/PDB/PDBTypes.h
+++ b/include/llvm/DebugInfo/PDB/PDBTypes.h
@@ -1,4 +1,4 @@
-//===- PDBTypes.h - Defines enums for various fields contained in PDB ---*-===//
+//===- PDBTypes.h - Defines enums for various fields contained in PDB ----====//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -10,9 +10,10 @@
 #ifndef LLVM_DEBUGINFO_PDB_PDBTYPES_H
 #define LLVM_DEBUGINFO_PDB_PDBTYPES_H
 
-#include "llvm/Config/llvm-config.h"
 #include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
 #include "llvm/DebugInfo/PDB/Native/RawTypes.h"
+#include <cstddef>
 #include <cstdint>
 #include <cstring>
 #include <functional>
@@ -20,21 +21,11 @@
 namespace llvm {
 namespace pdb {
 
+class IPDBDataStream;
+class IPDBLineNumber;
+class IPDBSourceFile;
 class PDBSymDumper;
 class PDBSymbol;
-
-class IPDBDataStream;
-template <class T> class IPDBEnumChildren;
-class IPDBLineNumber;
-class IPDBRawSymbol;
-class IPDBSession;
-class IPDBSourceFile;
-
-typedef IPDBEnumChildren<PDBSymbol> IPDBEnumSymbols;
-typedef IPDBEnumChildren<IPDBSourceFile> IPDBEnumSourceFiles;
-typedef IPDBEnumChildren<IPDBDataStream> IPDBEnumDataStreams;
-typedef IPDBEnumChildren<IPDBLineNumber> IPDBEnumLineNumbers;
-
 class PDBSymbolExe;
 class PDBSymbolCompiland;
 class PDBSymbolCompilandDetails;
@@ -67,6 +58,11 @@ class PDBSymbolTypeManaged;
 class PDBSymbolTypeDimension;
 class PDBSymbolUnknown;
 
+using IPDBEnumSymbols = IPDBEnumChildren<PDBSymbol>;
+using IPDBEnumSourceFiles = IPDBEnumChildren<IPDBSourceFile>;
+using IPDBEnumDataStreams = IPDBEnumChildren<IPDBDataStream>;
+using IPDBEnumLineNumbers = IPDBEnumChildren<IPDBLineNumber>;
+
 /// Specifies which PDB reader implementation is to be used.  Only a value
 /// of PDB_ReaderType::DIA is currently supported, but Native is in the works.
 enum class PDB_ReaderType {
@@ -104,7 +100,7 @@ enum class PDB_Checksum { None = 0, MD5 = 1, SHA1 = 2 };
 
 /// These values correspond to the CV_CPU_TYPE_e enumeration, and are documented
 /// here: https://msdn.microsoft.com/en-us/library/b2fc64ek.aspx
-typedef codeview::CPUType PDB_Cpu;
+using PDB_Cpu = codeview::CPUType;
 
 enum class PDB_Machine {
   Invalid = 0xffff,
@@ -135,12 +131,11 @@ enum class PDB_Machine {
 /// at the following locations:
 ///   https://msdn.microsoft.com/en-us/library/b2fc64ek.aspx
 ///   https://msdn.microsoft.com/en-us/library/windows/desktop/ms680207(v=vs.85).aspx
-///
-typedef codeview::CallingConvention PDB_CallingConv;
+using PDB_CallingConv = codeview::CallingConvention;
 
 /// These values correspond to the CV_CFL_LANG enumeration, and are documented
 /// here: https://msdn.microsoft.com/en-us/library/bw3aekw6.aspx
-typedef codeview::SourceLanguage PDB_Lang;
+using PDB_Lang = codeview::SourceLanguage;
 
 /// These values correspond to the DataKind enumeration, and are documented
 /// here: https://msdn.microsoft.com/en-us/library/b2x2t313.aspx
@@ -273,9 +268,9 @@ enum PDB_VariantType {
 };
 
 struct Variant {
-  Variant() : Type(PDB_VariantType::Empty) {}
+  Variant() = default;
 
-  Variant(const Variant &Other) : Type(PDB_VariantType::Empty) {
+  Variant(const Variant &Other) {
     *this = Other;
   }
 
@@ -284,7 +279,7 @@ struct Variant {
       delete[] Value.String;
   }
 
-  PDB_VariantType Type;
+  PDB_VariantType Type = PDB_VariantType::Empty;
   union {
     bool Bool;
     int8_t Int8;
@@ -344,18 +339,20 @@ struct Variant {
   }
 };
 
+} // end namespace pdb
 } // end namespace llvm
-}
 
 namespace std {
+
 template <> struct hash<llvm::pdb::PDB_SymType> {
-  typedef llvm::pdb::PDB_SymType argument_type;
-  typedef std::size_t result_type;
+  using argument_type = llvm::pdb::PDB_SymType;
+  using result_type = std::size_t;
 
   result_type operator()(const argument_type &Arg) const {
     return std::hash<int>()(static_cast<int>(Arg));
   }
 };
+
 } // end namespace std
 
 #endif // LLVM_DEBUGINFO_PDB_PDBTYPES_H
diff --git a/include/llvm/DebugInfo/PDB/UDTLayout.h b/include/llvm/DebugInfo/PDB/UDTLayout.h
index 6bc3660fbe5..c4234c191e2 100644
--- a/include/llvm/DebugInfo/PDB/UDTLayout.h
+++ b/include/llvm/DebugInfo/PDB/UDTLayout.h
@@ -10,30 +10,26 @@
 #ifndef LLVM_DEBUGINFO_PDB_UDTLAYOUT_H
 #define LLVM_DEBUGINFO_PDB_UDTLAYOUT_H
 
-#include "PDBSymbol.h"
-#include "PDBTypes.h"
-
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/DenseMap.h"
-
-#include <list>
+#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/PDB/PDBSymbol.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolTypeBaseClass.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolTypeBuiltin.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolTypeVTable.h"
+#include "llvm/DebugInfo/PDB/PDBTypes.h"
+#include <cstdint>
 #include <memory>
+#include <string>
+#include <vector>
 
 namespace llvm {
-
-class raw_ostream;
-
 namespace pdb {
 
-class PDBSymTypeBaseClass;
-class PDBSymbolData;
-class PDBSymbolTypeUDT;
-class PDBSymbolTypeVTable;
-
-class ClassLayout;
 class BaseClassLayout;
-class LayoutItemBase;
+class ClassLayout;
 class UDTLayoutBase;
 
 class LayoutItemBase {
@@ -41,7 +37,7 @@ public:
   LayoutItemBase(const UDTLayoutBase *Parent, const PDBSymbol *Symbol,
                  const std::string &Name, uint32_t OffsetInParent,
                  uint32_t Size, bool IsElided);
-  virtual ~LayoutItemBase() {}
+  virtual ~LayoutItemBase() = default;
 
   uint32_t deepPaddingSize() const;
   virtual uint32_t immediatePadding() const { return 0; }
@@ -79,7 +75,8 @@ public:
   VBPtrLayoutItem(const UDTLayoutBase &Parent,
                   std::unique_ptr<PDBSymbolTypeBuiltin> Sym, uint32_t Offset,
                   uint32_t Size);
-  virtual bool isVBPtr() const { return true; }
+
+  bool isVBPtr() const override { return true; }
 
 private:
   std::unique_ptr<PDBSymbolTypeBuiltin> Type;
@@ -120,17 +117,12 @@ public:
                 bool IsElided);
 
   uint32_t tailPadding() const override;
-
   ArrayRef<LayoutItemBase *> layout_items() const { return LayoutItems; }
-
   ArrayRef<BaseClassLayout *> bases() const { return AllBases; }
   ArrayRef<BaseClassLayout *> regular_bases() const { return NonVirtualBases; }
   ArrayRef<BaseClassLayout *> virtual_bases() const { return VirtualBases; }
-
   uint32_t directVirtualBaseCount() const { return DirectVBaseCount; }
-
   ArrayRef<std::unique_ptr<PDBSymbolFunc>> funcs() const { return Funcs; }
-
   ArrayRef<std::unique_ptr<PDBSymbol>> other_items() const { return Other; }
 
 protected:
@@ -183,7 +175,8 @@ private:
   std::unique_ptr<PDBSymbolTypeUDT> OwnedStorage;
   const PDBSymbolTypeUDT &UDT;
 };
-}
-} // namespace llvm
+
+} // end namespace pdb
+} // end namespace llvm
 
 #endif // LLVM_DEBUGINFO_PDB_UDTLAYOUT_H
diff --git a/lib/DebugInfo/CodeView/Formatters.cpp b/lib/DebugInfo/CodeView/Formatters.cpp
index ef00bd8570f..1fa8d219d6a 100644
--- a/lib/DebugInfo/CodeView/Formatters.cpp
+++ b/lib/DebugInfo/CodeView/Formatters.cpp
@@ -1,4 +1,4 @@
-//===- Formatters.cpp -------------------------------------------*- C++ -*-===//
+//===- Formatters.cpp -----------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,6 +8,10 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/CodeView/Formatters.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
 
 using namespace llvm;
 using namespace llvm::codeview;
@@ -19,7 +23,7 @@ GuidAdapter::GuidAdapter(StringRef Guid)
 GuidAdapter::GuidAdapter(ArrayRef<uint8_t> Guid)
     : FormatAdapter(std::move(Guid)) {}
 
-void GuidAdapter::format(llvm::raw_ostream &Stream, StringRef Style) {
+void GuidAdapter::format(raw_ostream &Stream, StringRef Style) {
   static const char *Lookup = "0123456789ABCDEF";
 
   assert(Item.size() == 16 && "Expected 16-byte GUID");
diff --git a/lib/DebugInfo/CodeView/StringsAndChecksums.cpp b/lib/DebugInfo/CodeView/StringsAndChecksums.cpp
index 928bf8c94f7..306af1d1ef6 100644
--- a/lib/DebugInfo/CodeView/StringsAndChecksums.cpp
+++ b/lib/DebugInfo/CodeView/StringsAndChecksums.cpp
@@ -1,4 +1,4 @@
-//===- StringsAndChecksums.cpp ----------------------------------*- C++ -*-===//
+//===- StringsAndChecksums.cpp --------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,14 +8,18 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/CodeView/StringsAndChecksums.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/DebugInfo/CodeView/CodeView.h"
 #include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
 #include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
 #include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
+#include "llvm/Support/Error.h"
+#include <cassert>
 
 using namespace llvm;
 using namespace llvm::codeview;
 
-StringsAndChecksumsRef::StringsAndChecksumsRef() {}
+StringsAndChecksumsRef::StringsAndChecksumsRef() = default;
 
 StringsAndChecksumsRef::StringsAndChecksumsRef(
     const DebugStringTableSubsectionRef &Strings)
diff --git a/lib/DebugInfo/CodeView/SymbolSerializer.cpp b/lib/DebugInfo/CodeView/SymbolSerializer.cpp
index 9f2d619d1a1..9a2e776feb7 100644
--- a/lib/DebugInfo/CodeView/SymbolSerializer.cpp
+++ b/lib/DebugInfo/CodeView/SymbolSerializer.cpp
@@ -1,4 +1,4 @@
-//===- SymbolSerializer.cpp -------------------------------------*- C++ -*-===//
+//===- SymbolSerializer.cpp -----------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,6 +8,13 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/CodeView/SymbolSerializer.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include <cassert>
+#include <cstdint>
+#include <cstring>
 
 using namespace llvm;
 using namespace llvm::codeview;
@@ -15,7 +22,7 @@ using namespace llvm::codeview;
 SymbolSerializer::SymbolSerializer(BumpPtrAllocator &Allocator,
                                    CodeViewContainer Container)
     : Storage(Allocator), RecordBuffer(MaxRecordLength),
-      Stream(RecordBuffer, llvm::support::little), Writer(Stream),
+      Stream(RecordBuffer, support::little), Writer(Stream),
       Mapping(Writer, Container) {}
 
 Error SymbolSerializer::visitSymbolBegin(CVSymbol &Record) {
diff --git a/lib/DebugInfo/PDB/Native/DbiModuleList.cpp b/lib/DebugInfo/PDB/Native/DbiModuleList.cpp
index 434f775097e..eea70b229c6 100644
--- a/lib/DebugInfo/PDB/Native/DbiModuleList.cpp
+++ b/lib/DebugInfo/PDB/Native/DbiModuleList.cpp
@@ -1,4 +1,4 @@
-//===- DbiModuleList.cpp - PDB module information list ----------*- C++ -*-===//
+//===- DbiModuleList.cpp - PDB module information list --------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,10 +6,17 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-#include "llvm/DebugInfo/PDB/Native/DbiModuleList.h"
 
+#include "llvm/DebugInfo/PDB/Native/DbiModuleList.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/iterator_range.h"
 #include "llvm/DebugInfo/PDB/Native/RawError.h"
+#include "llvm/Support/BinaryStreamReader.h"
 #include "llvm/Support/Error.h"
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
 
 using namespace llvm;
 using namespace llvm::pdb;
diff --git a/lib/DebugInfo/PDB/Native/Hash.cpp b/lib/DebugInfo/PDB/Native/Hash.cpp
index 2ad3f55dc5c..61188ece2dc 100644
--- a/lib/DebugInfo/PDB/Native/Hash.cpp
+++ b/lib/DebugInfo/PDB/Native/Hash.cpp
@@ -8,10 +8,10 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/Native/Hash.h"
-
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/JamCRC.h"
+#include <cstdint>
 
 using namespace llvm;
 using namespace llvm::support;
diff --git a/lib/DebugInfo/PDB/Native/HashTable.cpp b/lib/DebugInfo/PDB/Native/HashTable.cpp
index ebf8c9c04db..439217f91d0 100644
--- a/lib/DebugInfo/PDB/Native/HashTable.cpp
+++ b/lib/DebugInfo/PDB/Native/HashTable.cpp
@@ -1,4 +1,4 @@
-//===- HashTable.cpp - PDB Hash Table ---------------------------*- C++ -*-===//
+//===- HashTable.cpp - PDB Hash Table -------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,12 +8,16 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/Native/HashTable.h"
-
 #include "llvm/ADT/Optional.h"
-#include "llvm/ADT/SparseBitVector.h"
 #include "llvm/DebugInfo/PDB/Native/RawError.h"
-
-#include <assert.h>
+#include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/BinaryStreamWriter.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MathExtras.h"
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+#include <utility>
 
 using namespace llvm;
 using namespace llvm::pdb;
@@ -106,9 +110,11 @@ void HashTable::clear() {
 }
 
 uint32_t HashTable::capacity() const { return Buckets.size(); }
+
 uint32_t HashTable::size() const { return Present.count(); }
 
 HashTableIterator HashTable::begin() const { return HashTableIterator(*this); }
+
 HashTableIterator HashTable::end() const {
   return HashTableIterator(*this, 0, true);
 }
diff --git a/lib/DebugInfo/PDB/Native/ModuleDebugStream.cpp b/lib/DebugInfo/PDB/Native/ModuleDebugStream.cpp
index 83c56574a16..2e1f61c7a25 100644
--- a/lib/DebugInfo/PDB/Native/ModuleDebugStream.cpp
+++ b/lib/DebugInfo/PDB/Native/ModuleDebugStream.cpp
@@ -9,11 +9,11 @@
 
 #include "llvm/DebugInfo/PDB/Native/ModuleDebugStream.h"
 #include "llvm/ADT/iterator_range.h"
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
 #include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h"
-#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
 #include "llvm/DebugInfo/PDB/Native/RawError.h"
-#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
 #include "llvm/Support/BinaryStreamReader.h"
 #include "llvm/Support/BinaryStreamRef.h"
 #include "llvm/Support/Error.h"
@@ -97,7 +97,7 @@ ModuleDebugStreamRef::symbols(bool *HadError) const {
   return make_range(SymbolArray.begin(HadError), SymbolArray.end());
 }
 
-llvm::iterator_range<ModuleDebugStreamRef::DebugSubsectionIterator>
+iterator_range<ModuleDebugStreamRef::DebugSubsectionIterator>
 ModuleDebugStreamRef::subsections() const {
   return make_range(Subsections.begin(), Subsections.end());
 }
diff --git a/lib/DebugInfo/PDB/Native/ModuleDebugStreamBuilder.cpp b/lib/DebugInfo/PDB/Native/ModuleDebugStreamBuilder.cpp
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/lib/DebugInfo/PDB/Native/NamedStreamMap.cpp b/lib/DebugInfo/PDB/Native/NamedStreamMap.cpp
index 4f90cd9cd8a..354b8c0e07f 100644
--- a/lib/DebugInfo/PDB/Native/NamedStreamMap.cpp
+++ b/lib/DebugInfo/PDB/Native/NamedStreamMap.cpp
@@ -1,4 +1,4 @@
-//===- NamedStreamMap.cpp - PDB Named Stream Map ----------------*- C++ -*-===//
+//===- NamedStreamMap.cpp - PDB Named Stream Map --------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,17 +8,20 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/Native/NamedStreamMap.h"
-
-#include "llvm/ADT/SparseBitVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/DebugInfo/PDB/Native/HashTable.h"
 #include "llvm/DebugInfo/PDB/Native/RawError.h"
 #include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/BinaryStreamRef.h"
+#include "llvm/Support/BinaryStreamWriter.h"
+#include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
 #include <algorithm>
+#include <cassert>
 #include <cstdint>
+#include <tuple>
 
 using namespace llvm;
 using namespace llvm::pdb;
diff --git a/lib/DebugInfo/PDB/Native/NativeRawSymbol.cpp b/lib/DebugInfo/PDB/Native/NativeRawSymbol.cpp
index ed6db63edba..b4f5c96ce66 100644
--- a/lib/DebugInfo/PDB/Native/NativeRawSymbol.cpp
+++ b/lib/DebugInfo/PDB/Native/NativeRawSymbol.cpp
@@ -1,4 +1,4 @@
-//===- NativeRawSymbol.cpp - Native implementation of IPDBRawSymbol -*- C++ -*-===//
+//===- NativeRawSymbol.cpp - Native implementation of IPDBRawSymbol -------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,16 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/Native/NativeRawSymbol.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
-#include "llvm/DebugInfo/PDB/Native/NativeSession.h"
-#include "llvm/DebugInfo/PDB/PDBExtras.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolTypeBuiltin.h"
-#include "llvm/DebugInfo/PDB/PDBSymbolTypeVTable.h"
-#include "llvm/DebugInfo/PDB/PDBSymbolTypeVTableShape.h"
-#include "llvm/Support/ConvertUTF.h"
-#include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 using namespace llvm::pdb;
@@ -49,7 +40,7 @@ NativeRawSymbol::findInlineFramesByRVA(uint32_t RVA) const {
   return nullptr;
 }
 
-void NativeRawSymbol::getDataBytes(llvm::SmallVector<uint8_t, 32> &bytes) const {
+void NativeRawSymbol::getDataBytes(SmallVector<uint8_t, 32> &bytes) const {
   bytes.clear();
 }
 
@@ -109,7 +100,7 @@ uint32_t NativeRawSymbol::getClassParentId() const {
 }
 
 std::string NativeRawSymbol::getCompilerName() const {
-  return 0;
+  return {};
 }
 
 uint32_t NativeRawSymbol::getCount() const {
@@ -136,7 +127,7 @@ uint32_t NativeRawSymbol::getLexicalParentId() const {
 }
 
 std::string NativeRawSymbol::getLibraryName() const {
-  return "";
+  return {};
 }
 
 uint32_t NativeRawSymbol::getLiveRangeStartAddressOffset() const {
@@ -164,7 +155,7 @@ uint32_t NativeRawSymbol::getMemorySpaceKind() const {
 }
 
 std::string NativeRawSymbol::getName() const {
-  return 0;
+  return {};
 }
 
 uint32_t NativeRawSymbol::getNumberOfAcceleratorPointerTags() const {
@@ -188,7 +179,7 @@ uint32_t NativeRawSymbol::getNumberOfRows() const {
 }
 
 std::string NativeRawSymbol::getObjectFileName() const {
-  return "";
+  return {};
 }
 
 uint32_t NativeRawSymbol::getOemId() const {
@@ -240,7 +231,7 @@ uint32_t NativeRawSymbol::getSlot() const {
 }
 
 std::string NativeRawSymbol::getSourceFileName() const {
-  return 0;
+  return {};
 }
 
 uint32_t NativeRawSymbol::getStride() const {
@@ -251,7 +242,7 @@ uint32_t NativeRawSymbol::getSubTypeId() const {
   return 0;
 }
 
-std::string NativeRawSymbol::getSymbolsFileName() const { return ""; }
+std::string NativeRawSymbol::getSymbolsFileName() const { return {}; }
 
 uint32_t NativeRawSymbol::getSymIndexId() const { return SymbolId; }
 
@@ -292,7 +283,7 @@ uint32_t NativeRawSymbol::getUavSlot() const {
 }
 
 std::string NativeRawSymbol::getUndecoratedName() const {
-  return 0;
+  return {};
 }
 
 uint32_t NativeRawSymbol::getUnmodifiedTypeId() const {
@@ -701,5 +692,5 @@ bool NativeRawSymbol::wasInlined() const {
 }
 
 std::string NativeRawSymbol::getUnused() const {
-  return "";
+  return {};
 }
diff --git a/lib/DebugInfo/PDB/PDB.cpp b/lib/DebugInfo/PDB/PDB.cpp
index 7e3acc1165f..501d4f5985b 100644
--- a/lib/DebugInfo/PDB/PDB.cpp
+++ b/lib/DebugInfo/PDB/PDB.cpp
@@ -1,4 +1,4 @@
-//===- PDB.cpp - base header file for creating a PDB reader -----*- C++ -*-===//
+//===- PDB.cpp - base header file for creating a PDB reader ---------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,18 +8,14 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/PDB.h"
-
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Config/config.h"
 #include "llvm/DebugInfo/PDB/GenericError.h"
-#include "llvm/DebugInfo/PDB/IPDBSession.h"
-#include "llvm/DebugInfo/PDB/PDB.h"
 #if LLVM_ENABLE_DIA_SDK
 #include "llvm/DebugInfo/PDB/DIA/DIASession.h"
 #endif
 #include "llvm/DebugInfo/PDB/Native/NativeSession.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Error.h"
 
 using namespace llvm;
 using namespace llvm::pdb;
@@ -33,7 +29,7 @@ Error llvm::pdb::loadDataForPDB(PDB_ReaderType Type, StringRef Path,
 #if LLVM_ENABLE_DIA_SDK
   return DIASession::createFromPdb(Path, Session);
 #else
-  return llvm::make_error<GenericError>("DIA is not installed on the system");
+  return make_error<GenericError>("DIA is not installed on the system");
 #endif
 }
 
@@ -46,6 +42,6 @@ Error llvm::pdb::loadDataForEXE(PDB_ReaderType Type, StringRef Path,
 #if LLVM_ENABLE_DIA_SDK
   return DIASession::createFromExe(Path, Session);
 #else
-  return llvm::make_error<GenericError>("DIA is not installed on the system");
+  return make_error<GenericError>("DIA is not installed on the system");
 #endif
 }
diff --git a/lib/DebugInfo/PDB/PDBExtras.cpp b/lib/DebugInfo/PDB/PDBExtras.cpp
index dc22a30faca..faf1142ddf1 100644
--- a/lib/DebugInfo/PDB/PDBExtras.cpp
+++ b/lib/DebugInfo/PDB/PDBExtras.cpp
@@ -1,4 +1,4 @@
-//===- PDBExtras.cpp - helper functions and classes for PDBs -----*- C++-*-===//
+//===- PDBExtras.cpp - helper functions and classes for PDBs --------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,9 +8,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/PDBExtras.h"
-
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/DebugInfo/CodeView/Formatters.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 using namespace llvm::pdb;
diff --git a/lib/DebugInfo/PDB/UDTLayout.cpp b/lib/DebugInfo/PDB/UDTLayout.cpp
index da353cb6977..5f4390bbaf1 100644
--- a/lib/DebugInfo/PDB/UDTLayout.cpp
+++ b/lib/DebugInfo/PDB/UDTLayout.cpp
@@ -1,4 +1,4 @@
-//===- UDTLayout.cpp --------------------------------------------*- C++ -*-===//
+//===- UDTLayout.cpp ------------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,20 +8,25 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/UDTLayout.h"
-
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/DebugInfo/PDB/IPDBRawSymbol.h"
 #include "llvm/DebugInfo/PDB/IPDBSession.h"
 #include "llvm/DebugInfo/PDB/PDBSymbol.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolData.h"
-#include "llvm/DebugInfo/PDB/PDBSymbolExe.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolTypeBaseClass.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolTypeBuiltin.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolTypePointer.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolTypeVTable.h"
-
-#include <utility>
+#include "llvm/DebugInfo/PDB/PDBTypes.h"
+#include "llvm/Support/Casting.h"
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+#include <memory>
 
 using namespace llvm;
 using namespace llvm::pdb;
@@ -176,7 +181,6 @@ void UDTLayoutBase::initializeChildren(const PDBSymbol &Sym) {
       else
         Bases.push_back(std::move(Base));
     }
-
     else if (auto Data = unique_dyn_cast<PDBSymbolData>(Child)) {
       if (Data->getDataKind() == PDB_DataKind::Member)
         Members.push_back(std::move(Data));
@@ -296,4 +300,4 @@ void UDTLayoutBase::addChildToLayout(std::unique_ptr<LayoutItemBase> Child) {
   }
 
   ChildStorage.push_back(std::move(Child));
-}
\ No newline at end of file
+}