Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 72 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/DebugInfo/PDB/Native/NamedStreamMap.h b/clang-r353983/include/llvm/DebugInfo/PDB/Native/NamedStreamMap.h
new file mode 100644
index 00000000..c49d7963
--- /dev/null
+++ b/clang-r353983/include/llvm/DebugInfo/PDB/Native/NamedStreamMap.h
@@ -0,0 +1,72 @@
+//===- NamedStreamMap.h - PDB Named Stream Map ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#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 NamedStreamMap;
+
+struct NamedStreamMapTraits {
+  NamedStreamMap *NS;
+
+  explicit NamedStreamMapTraits(NamedStreamMap &NS);
+  uint16_t hashLookupKey(StringRef S) const;
+  StringRef storageKeyToLookupKey(uint32_t Offset) const;
+  uint32_t lookupKeyToStorageKey(StringRef S);
+};
+
+class NamedStreamMap {
+  friend class NamedStreamMapBuilder;
+
+public:
+  NamedStreamMap();
+
+  Error load(BinaryStreamReader &Stream);
+  Error commit(BinaryStreamWriter &Writer) const;
+  uint32_t calculateSerializedLength() const;
+
+  uint32_t size() const;
+  bool get(StringRef Stream, uint32_t &StreamNo) const;
+  void set(StringRef Stream, uint32_t StreamNo);
+
+  uint32_t appendStringData(StringRef S);
+  StringRef getString(uint32_t Offset) const;
+  uint32_t hashString(uint32_t Offset) const;
+
+  StringMap<uint32_t> entries() const;
+
+private:
+  NamedStreamMapTraits HashTraits;
+  /// Closed hash table from Offset -> StreamNumber, where Offset is the offset
+  /// of the stream name in NamesBuffer.
+  HashTable<support::ulittle32_t, NamedStreamMapTraits> OffsetIndexMap;
+
+  /// Buffer of string data.
+  std::vector<char> NamesBuffer;
+};
+
+} // end namespace pdb
+
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_NATIVE_NAMEDSTREAMMAP_H