1 files changed, 77 insertions, 0 deletions
diff --git a/include/llvm/DebugInfo/PDB/Raw/InfoStream.h b/include/llvm/DebugInfo/PDB/Raw/InfoStream.h
new file mode 100644
index 000000000000..1980bec7153e
--- /dev/null
+++ b/include/llvm/DebugInfo/PDB/Raw/InfoStream.h
@@ -0,0 +1,77 @@
+//===- InfoStream.h - PDB Info Stream (Stream 1) Access ---------*- 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_PDBINFOSTREAM_H
+#define LLVM_DEBUGINFO_PDB_RAW_PDBINFOSTREAM_H
+
+#include "llvm/ADT/StringMap.h"
+#include "llvm/DebugInfo/PDB/PDBTypes.h"
+#include "llvm/DebugInfo/PDB/Raw/MappedBlockStream.h"
+#include "llvm/DebugInfo/PDB/Raw/NameMap.h"
+#include "llvm/DebugInfo/PDB/Raw/RawConstants.h"
+
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+
+namespace llvm {
+namespace pdb {
+class InfoStreamBuilder;
+class PDBFile;
+
+class InfoStream {
+  friend class InfoStreamBuilder;
+
+  struct HeaderInfo {
+    support::ulittle32_t Version;
+    support::ulittle32_t Signature;
+    support::ulittle32_t Age;
+    PDB_UniqueId Guid;
+  };
+
+public:
+  InfoStream(std::unique_ptr<MappedBlockStream> Stream);
+
+  Error reload();
+  Error commit();
+
+  PdbRaw_ImplVer getVersion() const;
+  uint32_t getSignature() const;
+  uint32_t getAge() const;
+  PDB_UniqueId getGuid() const;
+
+  uint32_t getNamedStreamIndex(llvm::StringRef Name) const;
+  iterator_range<StringMapConstIterator<uint32_t>> named_streams() const;
+
+private:
+  std::unique_ptr<MappedBlockStream> Stream;
+
+  // PDB file format version.  We only support VC70.  See the enumeration
+  // `PdbRaw_ImplVer` for the other possible values.
+  uint32_t Version;
+
+  // A 32-bit signature unique across all PDBs.  This is generated with
+  // a call to time() when the PDB is written, but obviously this is not
+  // universally unique.
+  uint32_t Signature;
+
+  // The number of times the PDB has been written.  Might also be used to
+  // ensure that the PDB matches the executable.
+  uint32_t Age;
+
+  // Due to the aforementioned limitations with `Signature`, this is a new
+  // signature present on VC70 and higher PDBs which is guaranteed to be
+  // universally unique.
+  PDB_UniqueId Guid;
+
+  NameMap NamedStreams;
+};
+}
+}
+
+#endif