[llvm-pdbdump] Decipher the remaining PDB streams.

We know at least know the meaning of every stream of the
PDB file.  Yay!

llvm-svn: 270669

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp b/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
index 2cc2a73a0d1..6b5cd212ed9 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
@@ -302,3 +302,15 @@ Error DbiStream::initializeFileInfo() {
 
   return Error::success();
 }
+
+uint32_t DbiStream::getDebugStreamIndex(DbgHeaderType Type) const {
+  ArrayRef<uint8_t> DbgData;
+  if (auto EC = DbgHeader.getArrayRef(0, DbgData, DbgHeader.getLength())) {
+    consumeError(std::move(EC));
+    return uint32_t(-1);
+  }
+  ArrayRef<ulittle16_t> DebugStreams(
+      reinterpret_cast<const ulittle16_t *>(DbgData.data()),
+      DbgData.size() / sizeof(ulittle16_t));
+  return DebugStreams[static_cast<uint16_t>(Type)];
+}