[pdb] added support for dumping globals stream

[inglorion]

Summary

This adds support for dumping the globals stream from PDB files using llvm-pdbdump, similar to the support we have for the publics stream.

[ruiu]

Overall looking good, a few nits.

include/llvm/DebugInfo/PDB/Raw/GlobalsStream.h

12

nit: for include guards, CamelCase is usually converted to CAMEL_CASE, so s/GLOBALSSTREAM/GLOBALS_STREAM/

19

Remove this blank line.

28

Ditto

lib/DebugInfo/PDB/Raw/GSI.cpp

77–78

If (auto EC = ...)

lib/DebugInfo/PDB/Raw/GSI.h

19

Nice comment!

[zturner]

include/llvm/DebugInfo/PDB/Raw/GlobalsStream.h

30

Can you mark this explicit

lib/DebugInfo/PDB/Raw/GlobalsStream.cpp

33

AFAICT this class seems almost identical to PublicsStream. Can we merge them and just have one class that handles both stream types?

lib/DebugInfo/PDB/Raw/PublicsStream.cpp

27

Headers should go under include/llvm/DebugInfo/PDB/Raw, and then this directive will need to be updated to show the whole path.

[inglorion]

@ruiu's comments (thanks!)

[inglorion]

lib/DebugInfo/PDB/Raw/GSI.h

19

I knew you would like it. ;-)

[inglorion]

added missing "explicit" - thanks @zturner

[inglorion]

lib/DebugInfo/PDB/Raw/GlobalsStream.cpp

33

There are some structures that are common to both, but the streams don't have the same format. In particular, the publics stream has another header at the front, and a couple of maps at the end that do not occur in the globals stream. I decided to give each stream type its own class, but factor out the functionality for parsing the common structures so that they can share it. Ok to keep it that way?

lib/DebugInfo/PDB/Raw/PublicsStream.cpp

27

I thought of it more as an implementation detail - it's just there so that GlobalsStream.cpp and PublicsStream.cpp can get the declarations they need for the common code. Can I keep it this way and move it to include if we ever decide we want this to be a more public API?

[inglorion]

added missing "-globals" in pdbdump-headers.test

[inglorion]

Is this good to go now?

include/llvm/DebugInfo/PDB/Raw/GlobalsStream.h

+//===- GlobalsStream.h - PDB Index of Symbols by Name ------ ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_PDB_RAW_GLOBALS_STREAM_H
+#define LLVM_DEBUGINFO_PDB_RAW_GLOBALS_STREAM_H
+
+#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
+#include "llvm/DebugInfo/MSF/StreamArray.h"
+#include "llvm/DebugInfo/PDB/PDBTypes.h"
+#include "llvm/DebugInfo/PDB/Raw/RawConstants.h"
+#include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
+#include "llvm/Support/Error.h"
+
+namespace llvm {
+namespace pdb {
+class DbiStream;
+class PDBFile;
+
+class GlobalsStream {
+public:
+  GlobalsStream(std::unique_ptr<msf::MappedBlockStream> Stream);
+  ~GlobalsStream();
+  Error commit();
+  msf::FixedStreamArray<support::ulittle32_t> getHashBuckets() const {
+    return HashBuckets;
+  }
+  uint32_t getNumBuckets() const { return NumBuckets; }
+  Error reload();
+
+private:
+  msf::FixedStreamArray<support::ulittle32_t> HashBuckets;
+  msf::FixedStreamArray<PSHashRecord> HashRecords;
+  uint32_t NumBuckets;
+  std::unique_ptr<msf::MappedBlockStream> Stream;
+};
+}
+}
+
+#endif

include/llvm/DebugInfo/PDB/Raw/PDBFile.h

 
 namespace msf {
 class MappedBlockStream;
 class WritableStream;
 }
 
 namespace pdb {
 class DbiStream;
+class GlobalsStream;
 class InfoStream;
 class NameHashTable;
 class PDBFileBuilder;
 class PublicsStream;
 class SymbolStream;
 class TpiStream;
 
 class PDBFile : public msf::IMSFFile {
public:
 
   ArrayRef<support::ulittle32_t> getDirectoryBlockArray() const;
 
   Error parseFileHeaders();
   Error parseStreamData();
 
   Expected<InfoStream &> getPDBInfoStream();
   Expected<DbiStream &> getPDBDbiStream();
+  Expected<GlobalsStream &> getPDBGlobalsStream();
   Expected<TpiStream &> getPDBTpiStream();
   Expected<TpiStream &> getPDBIpiStream();
   Expected<PublicsStream &> getPDBPublicsStream();
   Expected<SymbolStream &> getPDBSymbolStream();
   Expected<NameHashTable &> getStringTable();
 
   BumpPtrAllocator &getAllocator() { return Allocator; }
 
 private:
   BumpPtrAllocator &Allocator;
 
   std::unique_ptr<msf::ReadableStream> Buffer;
 
   std::vector<uint32_t> FpmPages;
   msf::MSFLayout ContainerLayout;
 
+  std::unique_ptr<GlobalsStream> Globals;
   std::unique_ptr<InfoStream> Info;
   std::unique_ptr<DbiStream> Dbi;
   std::unique_ptr<TpiStream> Tpi;
   std::unique_ptr<TpiStream> Ipi;
   std::unique_ptr<PublicsStream> Publics;
   std::unique_ptr<SymbolStream> Symbols;
   std::unique_ptr<msf::MappedBlockStream> DirectoryStream;
   std::unique_ptr<msf::MappedBlockStream> StringTableStream;
   std::unique_ptr<NameHashTable> StringTable;
 };
 }
 }
 
 #endif

include/llvm/DebugInfo/PDB/Raw/PublicsStream.h

 #include "llvm/DebugInfo/PDB/Raw/RawConstants.h"
 #include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
 
 #include "llvm/Support/Error.h"
 
 namespace llvm {
 namespace pdb {
 class DbiStream;
+struct GSIHashHeader;
 class PDBFile;
 
 class PublicsStream {
-  struct GSIHashHeader;
   struct HeaderInfo;
 
 public:
   PublicsStream(PDBFile &File, std::unique_ptr<msf::MappedBlockStream> Stream);
   ~PublicsStream();
   Error reload();
 
   uint32_t getSymHash() const;

lib/DebugInfo/PDB/CMakeLists.txt

add_pdb_impl_folder(DIA
 
     set(LIBPDB_ADDITIONAL_HEADER_DIRS "${LLVM_MAIN_INCLUDE_DIR}/llvm/DebugInfo/PDB/DIA")
 endif()
 
 add_pdb_impl_folder(Raw
   Raw/DbiStream.cpp
   Raw/DbiStreamBuilder.cpp
   Raw/EnumTables.cpp
+  Raw/GlobalsStream.cpp
+  Raw/GSI.cpp
   Raw/Hash.cpp
   Raw/InfoStream.cpp
   Raw/InfoStreamBuilder.cpp
   Raw/ModInfo.cpp
   Raw/ModStream.cpp
   Raw/NameHashTable.cpp
   Raw/NameMap.cpp
   Raw/NameMapBuilder.cpp

lib/DebugInfo/PDB/Raw/GSI.h

+//===- GSI.h - Common Declarations for GlobalsStream and PublicsStream ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// The data structures defined in this file are based on the reference
+// implementation which is available at
+// https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.h
+//
+// When you are reading the reference source code, you'd find the
+// information below useful.
+//
+//  - ppdb1->m_fMinimalDbgInfo seems to be always true.
+//  - SMALLBUCKETS macro is defined.
+//
+// The reference doesn't compile, so I learned just by reading code.
+// It's not guaranteed to be correct.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_DEBUGINFO_PDB_RAW_GSI_H
+#define LLVM_LIB_DEBUGINFO_PDB_RAW_GSI_H
+
+#include "llvm/DebugInfo/MSF/StreamArray.h"
+#include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
+
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+
+namespace llvm {
+
+namespace msf {
+class StreamReader;
+}
+
+namespace pdb {
+
+/// From https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.cpp
+static const unsigned IPHR_HASH = 4096;
+
+/// Header of the hash tables found in the globals and publics sections.
+/// Based on GSIHashHeader in
+/// https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.h
+struct GSIHashHeader {
+  enum : unsigned {
+    HdrSignature = ~0U,
+    HdrVersion = 0xeffe0000 + 19990810,
+  };
+  support::ulittle32_t VerSignature;
+  support::ulittle32_t VerHdr;
+  support::ulittle32_t HrSize;
+  support::ulittle32_t NumBuckets;
+};
+
+Error readGSIHashBuckets(
+    msf::FixedStreamArray<support::ulittle32_t> &HashBuckets,
+    const GSIHashHeader *HashHdr, msf::StreamReader &Reader);
+Error readGSIHashHeader(const GSIHashHeader *&HashHdr,
+                        msf::StreamReader &Reader);
+Error readGSIHashRecords(msf::FixedStreamArray<PSHashRecord> &HashRecords,
+                         const GSIHashHeader *HashHdr,
+                         msf::StreamReader &Reader);
+}
+}
+
+#endif

lib/DebugInfo/PDB/Raw/GSI.cpp

+//===- GSI.cpp - Common Functions for GlobalsStream and PublicsStream  ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "GSI.h"
+
+#include "llvm/DebugInfo/MSF/StreamArray.h"
+#include "llvm/DebugInfo/MSF/StreamReader.h"
+#include "llvm/DebugInfo/PDB/Raw/RawError.h"
+#include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
+
+#include "llvm/Support/Error.h"
+
+namespace llvm {
+namespace pdb {
+
+static Error checkHashHdrVersion(const GSIHashHeader *HashHdr) {
+  if (HashHdr->VerHdr != GSIHashHeader::HdrVersion)
+    return make_error<RawError>(
+        raw_error_code::feature_unsupported,
+        "Encountered unsupported globals stream version.");
+
+  return Error::success();
+}
+
+Error readGSIHashBuckets(
+    msf::FixedStreamArray<support::ulittle32_t> &HashBuckets,
+    const GSIHashHeader *HashHdr, msf::StreamReader &Reader) {
+  if (auto EC = checkHashHdrVersion(HashHdr))
+    return EC;
+
+  // Before the actual hash buckets, there is a bitmap of length determined by
+  // IPHR_HASH.
+  ArrayRef<uint8_t> Bitmap;
+  size_t BitmapSizeInBits = alignTo(IPHR_HASH + 1, 32);
+  uint32_t NumBitmapEntries = BitmapSizeInBits / 8;
+  if (auto EC = Reader.readBytes(Bitmap, NumBitmapEntries))
+    return joinErrors(std::move(EC),
+                      make_error<RawError>(raw_error_code::corrupt_file,
+                                           "Could not read a bitmap."));
+  uint32_t NumBuckets = 0;
+  for (uint8_t B : Bitmap)
+    NumBuckets += countPopulation(B);
+
+  // Hash buckets follow.
+  if (auto EC = Reader.readArray(HashBuckets, NumBuckets))
+    return joinErrors(std::move(EC),
+                      make_error<RawError>(raw_error_code::corrupt_file,
+                                           "Hash buckets corrupted."));
+
+  return Error::success();
+}
+
+Error readGSIHashHeader(const GSIHashHeader *&HashHdr,
+                        msf::StreamReader &Reader) {
+  if (Reader.readObject(HashHdr))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Stream does not contain a GSIHashHeader.");
+
+  if (HashHdr->VerSignature != GSIHashHeader::HdrSignature)
+    return make_error<RawError>(
+        raw_error_code::feature_unsupported,
+        "GSIHashHeader signature (0xffffffff) not found.");
+
+  return Error::success();
+}
+
+Error readGSIHashRecords(msf::FixedStreamArray<PSHashRecord> &HashRecords,
+                         const GSIHashHeader *HashHdr,
+                         msf::StreamReader &Reader) {
+  if (auto EC = checkHashHdrVersion(HashHdr))
+    return EC;
+
+  // HashHdr->HrSize specifies the number of bytes of PSHashRecords we have.
+  // Verify that we can read them all.
+  if (HashHdr->HrSize % sizeof(PSHashRecord))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Invalid HR array size.");
+  uint32_t NumHashRecords = HashHdr->HrSize / sizeof(PSHashRecord);
+  if (auto EC = Reader.readArray(HashRecords, NumHashRecords))
+    return joinErrors(std::move(EC),
+                      make_error<RawError>(raw_error_code::corrupt_file,
+                                           "Error reading hash records."));
+
+  return Error::success();
+}
+}
+}

lib/DebugInfo/PDB/Raw/GlobalsStream.cpp

+//===- GlobalsStream.cpp - PDB Index of Symbols by Name ---- ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/Raw/GlobalsStream.h"
+
+#include "GSI.h"
+#include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
+#include "llvm/DebugInfo/PDB/Raw/RawError.h"
+#include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
+
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+
+using namespace llvm;
+using namespace llvm::msf;
+using namespace llvm::pdb;
+
+GlobalsStream::GlobalsStream(std::unique_ptr<MappedBlockStream> Stream)
+    : Stream(std::move(Stream)) {}
+
+GlobalsStream::~GlobalsStream() {}
+
+Error GlobalsStream::reload() {
+  StreamReader Reader(*Stream);
+
+  const GSIHashHeader *HashHdr;
+  if (auto EC = readGSIHashHeader(HashHdr, Reader))
+    return EC;
+
+  if (auto EC = readGSIHashRecords(HashRecords, HashHdr, Reader))
+    return EC;
+
+  if (auto EC = readGSIHashBuckets(HashBuckets, HashHdr, Reader))
+    return EC;
+  NumBuckets = HashBuckets.size();
+
+  return Error::success();
+}
+
+Error GlobalsStream::commit() { return Error::success(); }

lib/DebugInfo/PDB/Raw/PDBFile.cpp

 #include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/DebugInfo/MSF/StreamArray.h"
 #include "llvm/DebugInfo/MSF/StreamInterface.h"
 #include "llvm/DebugInfo/MSF/StreamReader.h"
 #include "llvm/DebugInfo/MSF/StreamWriter.h"
 #include "llvm/DebugInfo/PDB/Raw/DbiStream.h"
+#include "llvm/DebugInfo/PDB/Raw/GlobalsStream.h"
 #include "llvm/DebugInfo/PDB/Raw/InfoStream.h"
 #include "llvm/DebugInfo/PDB/Raw/NameHashTable.h"
 #include "llvm/DebugInfo/PDB/Raw/PublicsStream.h"
 #include "llvm/DebugInfo/PDB/Raw/RawError.h"
 #include "llvm/DebugInfo/PDB/Raw/SymbolStream.h"
 #include "llvm/DebugInfo/PDB/Raw/TpiStream.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/FileOutputBuffer.h"
Error PDBFile::parseStreamData() {
   DirectoryStream = std::move(DS);
   return Error::success();
 }
 
 llvm::ArrayRef<support::ulittle32_t> PDBFile::getDirectoryBlockArray() const {
   return ContainerLayout.DirectoryBlocks;
 }
 
+Expected<GlobalsStream &> PDBFile::getPDBGlobalsStream() {
+  if (!Globals) {
+    auto DbiS = getPDBDbiStream();
+    if (!DbiS)
+      return DbiS.takeError();
+
+    auto GlobalS = MappedBlockStream::createIndexedStream(
+        ContainerLayout, *Buffer, DbiS->getGlobalSymbolStreamIndex());
+    auto TempGlobals = llvm::make_unique<GlobalsStream>(std::move(GlobalS));
+    if (auto EC = TempGlobals->reload())
+      return std::move(EC);
+    Globals = std::move(TempGlobals);
+  }
+  return *Globals;
+}
+
 Expected<InfoStream &> PDBFile::getPDBInfoStream() {
   if (!Info) {
     auto InfoS = MappedBlockStream::createIndexedStream(ContainerLayout,
                                                         *Buffer, StreamPDB);
     auto TempInfo = llvm::make_unique<InfoStream>(std::move(InfoS));
     if (auto EC = TempInfo->reload())
       return std::move(EC);
     Info = std::move(TempInfo);

lib/DebugInfo/PDB/Raw/PublicsStream.cpp

 //
 // The reference doesn't compile, so I learned just by reading code.
 // It's not guaranteed to be correct.
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/PDB/Raw/PublicsStream.h"
 
+#include "GSI.h"
 #include "llvm/DebugInfo/CodeView/CodeView.h"
 #include "llvm/DebugInfo/CodeView/TypeRecord.h"
 #include "llvm/DebugInfo/MSF/MappedBlockStream.h"
 #include "llvm/DebugInfo/MSF/StreamReader.h"
 #include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
 #include "llvm/DebugInfo/PDB/Raw/RawConstants.h"
 #include "llvm/DebugInfo/PDB/Raw/RawError.h"
 #include "llvm/DebugInfo/PDB/Raw/SymbolStream.h"
 
 #include "llvm/ADT/BitVector.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/MathExtras.h"
 
 using namespace llvm;
 using namespace llvm::msf;
 using namespace llvm::support;
 using namespace llvm::pdb;
 
 
-static const unsigned IPHR_HASH = 4096;
-
 // This is PSGSIHDR struct defined in
 // https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.h
 struct PublicsStream::HeaderInfo {
   ulittle32_t SymHash;
   ulittle32_t AddrMap;
   ulittle32_t NumThunks;
   ulittle32_t SizeOfThunk;
   ulittle16_t ISectThunkTable;
   char Padding[2];
   ulittle32_t OffThunkTable;
   ulittle32_t NumSections;
 };
 
-// This is GSIHashHdr.
-struct PublicsStream::GSIHashHeader {
-  enum : unsigned {
-    HdrSignature = ~0U,
-    HdrVersion = 0xeffe0000 + 19990810,
-  };
-  ulittle32_t VerSignature;
-  ulittle32_t VerHdr;
-  ulittle32_t HrSize;
-  ulittle32_t NumBuckets;
-};
-
 PublicsStream::PublicsStream(PDBFile &File,
                              std::unique_ptr<MappedBlockStream> Stream)
     : Pdb(File), Stream(std::move(Stream)) {}
 
 PublicsStream::~PublicsStream() {}
 
 uint32_t PublicsStream::getSymHash() const { return Header->SymHash; }
 uint32_t PublicsStream::getAddrMap() const { return Header->AddrMap; }
if (Reader.bytesRemaining() < sizeof(HeaderInfo) + sizeof(GSIHashHeader))
     return make_error<RawError>(raw_error_code::corrupt_file,
                                 "Publics Stream does not contain a header.");
 
   // Read PSGSIHDR and GSIHashHdr structs.
   if (Reader.readObject(Header))
     return make_error<RawError>(raw_error_code::corrupt_file,
                                 "Publics Stream does not contain a header.");
 
-  if (Reader.readObject(HashHdr))
-    return make_error<RawError>(raw_error_code::corrupt_file,
-                                "Publics Stream does not contain a header.");
-
-  // An array of HashRecord follows. Read them.
-  if (HashHdr->HrSize % sizeof(PSHashRecord))
-    return make_error<RawError>(raw_error_code::corrupt_file,
-                                "Invalid HR array size.");
-  uint32_t NumHashRecords = HashHdr->HrSize / sizeof(PSHashRecord);
-  if (auto EC = Reader.readArray(HashRecords, NumHashRecords))
-    return joinErrors(std::move(EC),
-                      make_error<RawError>(raw_error_code::corrupt_file,
-                                           "Could not read an HR array"));
+  if (auto EC = readGSIHashHeader(HashHdr, Reader))
+    return EC;
 
-  // A bitmap of a fixed length follows.
-  size_t BitmapSizeInBits = alignTo(IPHR_HASH + 1, 32);
-  uint32_t NumBitmapEntries = BitmapSizeInBits / 8;
-  if (auto EC = Reader.readBytes(Bitmap, NumBitmapEntries))
-    return joinErrors(std::move(EC),
-                      make_error<RawError>(raw_error_code::corrupt_file,
-                                           "Could not read a bitmap."));
-  for (uint8_t B : Bitmap)
-    NumBuckets += countPopulation(B);
-
-  // We don't yet understand the following data structures completely,
-  // but we at least know the types and sizes. Here we are trying
-  // to read the stream till end so that we at least can detect
-  // corrupted streams.
+  if (auto EC = readGSIHashRecords(HashRecords, HashHdr, Reader))
+    return EC;
 
-  // Hash buckets follow.
-  if (auto EC = Reader.readArray(HashBuckets, NumBuckets))
-    return joinErrors(std::move(EC),
-                      make_error<RawError>(raw_error_code::corrupt_file,
-                                           "Hash buckets corrupted."));
+  if (auto EC = readGSIHashBuckets(HashBuckets, HashHdr, Reader))
+    return EC;
+  NumBuckets = HashBuckets.size();
 
   // Something called "address map" follows.
   uint32_t NumAddressMapEntries = Header->AddrMap / sizeof(uint32_t);
   if (auto EC = Reader.readArray(AddressMap, NumAddressMapEntries))
     return joinErrors(std::move(EC),
                       make_error<RawError>(raw_error_code::corrupt_file,
                                            "Could not read an address map."));
 

test/DebugInfo/PDB/pdbdump-headers.test

 ; EMPTY-NEXT:     Group: 0
 ; EMPTY-NEXT:     Frame: 0
 ; EMPTY-NEXT:     SecName: 65535
 ; EMPTY-NEXT:     ClassName: 65535
 ; EMPTY-NEXT:     Offset: 0
 ; EMPTY-NEXT:     SecByteLength: 4294967295
 ; EMPTY-NEXT:   }
 ; EMPTY-NEXT: ]
-; EMPTY:      Publics Stream {
+; EMPTY-NEXT: Globals Stream {
+; EMPTY-NEXT:   Stream number: 6
+; EMPTY-NEXT:   Number of buckets: 2
+; EMPTY-NEXT:   Hash Buckets: [0, 12]
+; EMPTY-NEXT: }
+; EMPTY-NEXT: Publics Stream {
 ; EMPTY-NEXT:   Stream number: 7
 ; EMPTY-NEXT:   SymHash: 556
 ; EMPTY-NEXT:   AddrMap: 8
 ; EMPTY-NEXT:   Number of buckets: 2
 ; EMPTY-NEXT:   Hash Buckets: [0, 12]
 ; EMPTY-NEXT:   Address Map: [36, 0]
 ; EMPTY-NEXT:   Thunk Map: [4112]
 ; EMPTY-NEXT:   Section Offsets: [4096, 1]

 ; ALL:     Group: 0
 ; ALL:     Frame: 0
 ; ALL:     SecName: 65535
 ; ALL:     ClassName: 65535
 ; ALL:     Offset: 0
 ; ALL:     SecByteLength: 4294967295
 ; ALL:   }
 ; ALL: ]
+; ALL: Globals Stream {
+; ALL:   Stream number: 6
+; ALL:   Number of buckets: 2
+; ALL:   Hash Buckets: [0, 12]
+; ALL: }
 ; ALL: Publics Stream {
 ; ALL:   Stream number: 7
 ; ALL:   SymHash: 556
 ; ALL:   AddrMap: 8
 ; ALL:   Number of buckets: 2
 ; ALL:   Hash Buckets: [0, 12]
 ; ALL:   Address Map: [36, 0]
 ; ALL:   Thunk Map: [4112]

tools/llvm-pdbdump/LLVMOutputStyle.h

 
 private:
   void discoverStreamPurposes();
 
   Error dumpFileHeaders();
   Error dumpStreamSummary();
   Error dumpFreePageMap();
   Error dumpBlockRanges();
+  Error dumpGlobalsStream();
   Error dumpStreamBytes();
   Error dumpStreamBlocks();
   Error dumpInfoStream();
   Error dumpTpiStream(uint32_t StreamIdx);
   Error dumpDbiStream();
   Error dumpSectionContribs();
   Error dumpSectionMap();
   Error dumpPublicsStream();

tools/llvm-pdbdump/LLVMOutputStyle.cpp

 #include "llvm/DebugInfo/CodeView/EnumTables.h"
 #include "llvm/DebugInfo/CodeView/ModuleSubstreamVisitor.h"
 #include "llvm/DebugInfo/CodeView/SymbolDumper.h"
 #include "llvm/DebugInfo/MSF/MappedBlockStream.h"
 #include "llvm/DebugInfo/MSF/StreamReader.h"
 #include "llvm/DebugInfo/PDB/PDBExtras.h"
 #include "llvm/DebugInfo/PDB/Raw/DbiStream.h"
 #include "llvm/DebugInfo/PDB/Raw/EnumTables.h"
+#include "llvm/DebugInfo/PDB/Raw/GlobalsStream.h"
 #include "llvm/DebugInfo/PDB/Raw/ISectionContribVisitor.h"
 #include "llvm/DebugInfo/PDB/Raw/InfoStream.h"
 #include "llvm/DebugInfo/PDB/Raw/ModInfo.h"
 #include "llvm/DebugInfo/PDB/Raw/ModStream.h"
 #include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
 #include "llvm/DebugInfo/PDB/Raw/PublicsStream.h"
 #include "llvm/DebugInfo/PDB/Raw/RawError.h"
 #include "llvm/DebugInfo/PDB/Raw/TpiStream.h"
if (auto EC = dumpDbiStream())
     return EC;
 
   if (auto EC = dumpSectionContribs())
     return EC;
 
   if (auto EC = dumpSectionMap())
     return EC;
 
+  if (auto EC = dumpGlobalsStream())
+    return EC;
+
   if (auto EC = dumpPublicsStream())
     return EC;
 
   if (auto EC = dumpSectionHeaders())
     return EC;
 
   if (auto EC = dumpFpoStream())
     return EC;

 void LLVMOutputStyle::dumpBitVector(StringRef Name, const BitVector &V) {
   std::vector<uint32_t> Vec;
   for (uint32_t I = 0, E = V.size(); I != E; ++I)
     if (V[I])
       Vec.push_back(I);
   P.printList(Name, Vec);
 }
 
+Error LLVMOutputStyle::dumpGlobalsStream() {
+  if (!opts::raw::DumpGlobals)
+    return Error::success();
+
+  DictScope D(P, "Globals Stream");
+  auto Globals = File.getPDBGlobalsStream();
+  if (!Globals)
+    return Globals.takeError();
+
+  auto Dbi = File.getPDBDbiStream();
+  if (!Dbi)
+    return Dbi.takeError();
+
+  P.printNumber("Stream number", Dbi->getGlobalSymbolStreamIndex());
+  P.printNumber("Number of buckets", Globals->getNumBuckets());
+  P.printList("Hash Buckets", Globals->getHashBuckets());
+
+  return Error::success();
+}
+
 Error LLVMOutputStyle::dumpStreamBlocks() {
   if (!opts::raw::DumpStreamBlocks)
     return Error::success();
 
   ListScope L(P, "StreamBlocks");
   uint32_t StreamCount = File.getNumStreams();
   for (uint32_t StreamIdx = 0; StreamIdx < StreamCount; ++StreamIdx) {
     std::string Name("Stream ");

tools/llvm-pdbdump/llvm-pdbdump.h

 struct BlockRange {
   uint32_t Min;
   llvm::Optional<uint32_t> Max;
 };
 
 extern llvm::Optional<BlockRange> DumpBlockRange;
 extern llvm::cl::list<uint32_t> DumpStreamData;
 
+extern llvm::cl::opt<bool> DumpGlobals;
 extern llvm::cl::opt<bool> DumpHeaders;
 extern llvm::cl::opt<bool> DumpStreamBlocks;
 extern llvm::cl::opt<bool> DumpStreamSummary;
 extern llvm::cl::opt<bool> DumpPageStats;
 extern llvm::cl::opt<bool> DumpTpiHash;
 extern llvm::cl::opt<bool> DumpTpiRecordBytes;
 extern llvm::cl::opt<bool> DumpTpiRecords;
 extern llvm::cl::opt<bool> DumpIpiRecords;

tools/llvm-pdbdump/llvm-pdbdump.cpp

cl::opt<bool> DumpModules("modules", cl::desc("dump compiland information"),
                           cl::cat(FileOptions), cl::sub(RawSubcommand));
 cl::opt<bool> DumpModuleFiles("module-files", cl::desc("dump file information"),
                               cl::cat(FileOptions), cl::sub(RawSubcommand));
 cl::opt<bool> DumpLineInfo("line-info",
                            cl::desc("dump file and line information"),
                            cl::cat(FileOptions), cl::sub(RawSubcommand));
 
 // SYMBOL OPTIONS
+cl::opt<bool> DumpGlobals("globals", cl::desc("dump globals stream data"),
+                          cl::cat(SymbolOptions), cl::sub(RawSubcommand));
 cl::opt<bool> DumpModuleSyms("module-syms", cl::desc("dump module symbols"),
                              cl::cat(SymbolOptions), cl::sub(RawSubcommand));
 cl::opt<bool> DumpPublics("publics", cl::desc("dump Publics stream data"),
                           cl::cat(SymbolOptions), cl::sub(RawSubcommand));
 cl::opt<bool>
     DumpSymRecordBytes("sym-record-bytes",
                        cl::desc("dump CodeView symbol record raw bytes"),
                        cl::cat(SymbolOptions), cl::sub(RawSubcommand));
if (!opts::raw::DumpBlockRangeOpt.empty()) {
     }
   }
 
   if (opts::RawSubcommand && opts::raw::RawAll) {
     opts::raw::DumpHeaders = true;
     opts::raw::DumpModules = true;
     opts::raw::DumpModuleFiles = true;
     opts::raw::DumpModuleSyms = true;
+    opts::raw::DumpGlobals = true;
     opts::raw::DumpPublics = true;
     opts::raw::DumpSectionHeaders = true;
     opts::raw::DumpStreamSummary = true;
     opts::raw::DumpPageStats = true;
     opts::raw::DumpStreamBlocks = true;
     opts::raw::DumpTpiRecords = true;
     opts::raw::DumpTpiHash = true;
     opts::raw::DumpIpiRecords = true;