1 files changed, 13 insertions, 12 deletions
diff --git a/lib/Serialization/GlobalModuleIndex.cpp b/lib/Serialization/GlobalModuleIndex.cpp
index 9858122..4791388 100644
--- a/lib/Serialization/GlobalModuleIndex.cpp
+++ b/lib/Serialization/GlobalModuleIndex.cpp
@@ -122,11 +122,10 @@ typedef llvm::OnDiskIterableChainedHashTable<IdentifierIndexReaderTrait>
 
 }
 
-GlobalModuleIndex::GlobalModuleIndex(llvm::MemoryBuffer *Buffer,
+GlobalModuleIndex::GlobalModuleIndex(std::unique_ptr<llvm::MemoryBuffer> Buffer,
                                      llvm::BitstreamCursor Cursor)
-  : Buffer(Buffer), IdentifierIndex(),
-    NumIdentifierLookups(), NumIdentifierLookupHits()
-{
+    : Buffer(std::move(Buffer)), IdentifierIndex(), NumIdentifierLookups(),
+      NumIdentifierLookupHits() {
   // Read the global index.
   bool InGlobalIndexBlock = false;
   bool Done = false;
@@ -260,7 +259,7 @@ GlobalModuleIndex::readIndex(StringRef Path) {
     return std::make_pair(nullptr, EC_IOError);
   }
 
-  return std::make_pair(new GlobalModuleIndex(Buffer.release(), Cursor),
+  return std::make_pair(new GlobalModuleIndex(std::move(Buffer), Cursor),
                         EC_None);
 }
 
@@ -494,19 +493,17 @@ namespace {
 
 bool GlobalModuleIndexBuilder::loadModuleFile(const FileEntry *File) {
   // Open the module file.
-  std::unique_ptr<llvm::MemoryBuffer> Buffer;
-  std::string ErrorStr;
-  Buffer.reset(FileMgr.getBufferForFile(File, &ErrorStr, /*isVolatile=*/true));
+
+  auto Buffer = FileMgr.getBufferForFile(File, /*isVolatile=*/true);
   if (!Buffer) {
     return true;
   }
 
   // Initialize the input stream
   llvm::BitstreamReader InStreamFile;
-  llvm::BitstreamCursor InStream;
-  InStreamFile.init((const unsigned char *)Buffer->getBufferStart(),
-                  (const unsigned char *)Buffer->getBufferEnd());
-  InStream.init(InStreamFile);
+  InStreamFile.init((const unsigned char *)(*Buffer)->getBufferStart(),
+                    (const unsigned char *)(*Buffer)->getBufferEnd());
+  llvm::BitstreamCursor InStream(InStreamFile);
 
   // Sniff for the signature.
   if (InStream.Read(8) != 'C' ||
@@ -591,6 +588,10 @@ bool GlobalModuleIndexBuilder::loadModuleFile(const FileEntry *File) {
         off_t StoredSize = (off_t)Record[Idx++];
         time_t StoredModTime = (time_t)Record[Idx++];
 
+        // Skip the stored signature.
+        // FIXME: we could read the signature out of the import and validate it.
+        Idx++;
+
         // Retrieve the imported file name.
         unsigned Length = Record[Idx++];
         SmallString<128> ImportedFile(Record.begin() + Idx,