1 files changed, 50 insertions, 0 deletions
diff --git a/lib/DebugInfo/PDB/Raw/NameMapBuilder.cpp b/lib/DebugInfo/PDB/Raw/NameMapBuilder.cpp
new file mode 100644
index 000000000000..41c6c2cd810a
--- /dev/null
+++ b/lib/DebugInfo/PDB/Raw/NameMapBuilder.cpp
@@ -0,0 +1,50 @@
+//===- NameMapBuilder.cpp - PDB Name Map Builder ----------------*- 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/NameMapBuilder.h"
+
+#include "llvm/DebugInfo/PDB/Raw/NameMap.h"
+#include "llvm/Support/Endian.h"
+
+using namespace llvm;
+using namespace llvm::pdb;
+
+NameMapBuilder::NameMapBuilder() {}
+
+void NameMapBuilder::addMapping(StringRef Name, uint32_t Mapping) {
+  StringDataBytes += Name.size() + 1;
+  Map.insert({Name, Mapping});
+}
+
+Expected<std::unique_ptr<NameMap>> NameMapBuilder::build() {
+  auto Result = llvm::make_unique<NameMap>();
+  Result->Mapping = Map;
+  return std::move(Result);
+}
+
+uint32_t NameMapBuilder::calculateSerializedLength() const {
+  uint32_t TotalLength = 0;
+
+  TotalLength += sizeof(support::ulittle32_t); // StringDataBytes value
+  TotalLength += StringDataBytes;              // actual string data
+
+  TotalLength += sizeof(support::ulittle32_t); // Hash Size
+  TotalLength += sizeof(support::ulittle32_t); // Max Number of Strings
+  TotalLength += sizeof(support::ulittle32_t); // Num Present Words
+  // One bitmask word for each present entry
+  TotalLength += Map.size() * sizeof(support::ulittle32_t);
+  TotalLength += sizeof(support::ulittle32_t); // Num Deleted Words
+
+  // For each present word, which we are treating as equivalent to the number of
+  // entries in the table, we have a pair of integers.  An offset into the
+  // string data, and a corresponding stream number.
+  TotalLength += Map.size() * 2 * sizeof(support::ulittle32_t);
+
+  return TotalLength;
+}