1 files changed, 78 insertions, 0 deletions
diff --git a/llvm/lib/DebugInfo/PDB/Raw/NamedStreamMap.cpp b/llvm/lib/DebugInfo/PDB/Raw/NamedStreamMap.cpp
new file mode 100644
index 00000000000..77077bc3738
--- /dev/null
+++ b/llvm/lib/DebugInfo/PDB/Raw/NamedStreamMap.cpp
@@ -0,0 +1,78 @@
+//===- NamedStreamMap.cpp - PDB Named Stream Map ----------------*- 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/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/MSF/StreamReader.h"
+#include "llvm/DebugInfo/PDB/Raw/HashTable.h"
+#include "llvm/DebugInfo/PDB/Raw/RawError.h"
+#include "llvm/Support/Error.h"
+#include <algorithm>
+#include <cstdint>
+
+using namespace llvm;
+using namespace llvm::msf;
+using namespace llvm::pdb;
+
+NamedStreamMap::NamedStreamMap() = default;
+
+Error NamedStreamMap::load(StreamReader &Stream) {
+  uint32_t StringBufferSize;
+  if (auto EC = Stream.readInteger(StringBufferSize))
+    return joinErrors(std::move(EC),
+                      make_error<RawError>(raw_error_code::corrupt_file,
+                                           "Expected string buffer size"));
+
+  msf::ReadableStreamRef StringsBuffer;
+  if (auto EC = Stream.readStreamRef(StringsBuffer, StringBufferSize))
+    return EC;
+
+  HashTable OffsetIndexMap;
+  if (auto EC = OffsetIndexMap.load(Stream))
+    return EC;
+
+  uint32_t NameOffset;
+  uint32_t NameIndex;
+  for (const auto &Entry : OffsetIndexMap) {
+    std::tie(NameOffset, NameIndex) = Entry;
+
+    // Compute the offset of the start of the string relative to the stream.
+    msf::StreamReader NameReader(StringsBuffer);
+    NameReader.setOffset(NameOffset);
+    // Pump out our c-string from the stream.
+    StringRef Str;
+    if (auto EC = NameReader.readZeroString(Str))
+      return joinErrors(std::move(EC),
+                        make_error<RawError>(raw_error_code::corrupt_file,
+                                             "Expected name map name"));
+
+    // Add this to a string-map from name to stream number.
+    Mapping.insert({Str, NameIndex});
+  }
+
+  return Error::success();
+}
+
+iterator_range<StringMapConstIterator<uint32_t>>
+NamedStreamMap::entries() const {
+  return make_range<StringMapConstIterator<uint32_t>>(Mapping.begin(),
+                                                      Mapping.end());
+}
+
+bool NamedStreamMap::tryGetValue(StringRef Name, uint32_t &Value) const {
+  auto Iter = Mapping.find(Name);
+  if (Iter == Mapping.end())
+    return false;
+  Value = Iter->second;
+  return true;
+}