1 files changed, 17 insertions, 13 deletions
diff --git a/lib/DebugInfo/PDB/Native/DbiModuleDescriptorBuilder.cpp b/lib/DebugInfo/PDB/Native/DbiModuleDescriptorBuilder.cpp
index b97f1e90bcf..12df042c4eb 100644
--- a/lib/DebugInfo/PDB/Native/DbiModuleDescriptorBuilder.cpp
+++ b/lib/DebugInfo/PDB/Native/DbiModuleDescriptorBuilder.cpp
@@ -19,7 +19,6 @@
 #include "llvm/DebugInfo/PDB/Native/GSIStreamBuilder.h"
 #include "llvm/DebugInfo/PDB/Native/RawConstants.h"
 #include "llvm/DebugInfo/PDB/Native/RawError.h"
-#include "llvm/Support/BinaryItemStream.h"
 #include "llvm/Support/BinaryStreamWriter.h"
 
 using namespace llvm;
@@ -66,12 +65,22 @@ void DbiModuleDescriptorBuilder::setFirstSectionContrib(
 }
 
 void DbiModuleDescriptorBuilder::addSymbol(CVSymbol Symbol) {
-  Symbols.push_back(Symbol);
-  // Symbols written to a PDB file are required to be 4 byte aligned.  The same
+  // Defer to the bulk API. It does the same thing.
+  addSymbolsInBulk(Symbol.data());
+}
+
+void DbiModuleDescriptorBuilder::addSymbolsInBulk(
+    ArrayRef<uint8_t> BulkSymbols) {
+  // Do nothing for empty runs of symbols.
+  if (BulkSymbols.empty())
+    return;
+
+  Symbols.push_back(BulkSymbols);
+  // Symbols written to a PDB file are required to be 4 byte aligned. The same
   // is not true of object files.
-  assert(Symbol.length() % alignOf(CodeViewContainer::Pdb) == 0 &&
+  assert(BulkSymbols.size() % alignOf(CodeViewContainer::Pdb) == 0 &&
          "Invalid Symbol alignment!");
-  SymbolByteSize += Symbol.length();
+  SymbolByteSize += BulkSymbols.size();
 }
 
 void DbiModuleDescriptorBuilder::addSourceFile(StringRef Path) {
@@ -145,16 +154,11 @@ Error DbiModuleDescriptorBuilder::commit(BinaryStreamWriter &ModiWriter,
     if (auto EC =
             SymbolWriter.writeInteger<uint32_t>(COFF::DEBUG_SECTION_MAGIC))
       return EC;
-    BinaryItemStream<CVSymbol> Records(llvm::support::endianness::little);
-    Records.setItems(Symbols);
-    BinaryStreamRef RecordsRef(Records);
-    if (auto EC = SymbolWriter.writeStreamRef(RecordsRef))
-      return EC;
-    if (auto EC = SymbolWriter.padToAlignment(4))
-      return EC;
-    // TODO: Write C11 Line data
+    for (ArrayRef<uint8_t> Syms : Symbols)
+      SymbolWriter.writeBytes(Syms);
     assert(SymbolWriter.getOffset() % alignOf(CodeViewContainer::Pdb) == 0 &&
            "Invalid debug section alignment!");
+    // TODO: Write C11 Line data
     for (const auto &Builder : C13Builders) {
       assert(Builder && "Empty C13 Fragment Builder!");
       if (auto EC = Builder->commit(SymbolWriter))