Bitcode streaming

include/llvm/Support/BitcodeStream.h

Index: include/llvm/Support/BitcodeStream.h
diff --git a/include/llvm/Support/BitcodeStream.h b/include/llvm/Support/BitcodeStream.h
new file mode 100644
index 0000000000000000000000000000000000000000..58af6f6b9626187e68e3abe883ea0ab30a7f6659
--- /dev/null
+++ b/include/llvm/Support/BitcodeStream.h
@@ -0,0 +1,39 @@
+//===---- llvm/Bitcode/BitcodeStream.h - Lazy bitcode streaming -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header defines BitcodeStreamer, which fetches bytes of bitcode from
+// a stream source. It provides support for streaming (lazy reading) of
+// bitcode.
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef LLVM_SUPPORT_BITCODESTREAM_H_
+#define LLVM_SUPPORT_BITCODESTREAM_H_
+
+#include <string>
+
+namespace llvm {
+class MemoryBuffer;
+
+class BitcodeStreamer {
+public:
+  /// Fetch bytes [start-end) from the bitcode stream, and write them to the
+  /// buffer pointed to by buf. Returns the number of bytes actually written.
+  virtual size_t GetBytes(unsigned char *buf, size_t len) = 0;
+
+  virtual ~BitcodeStreamer();
+};
+
+BitcodeStreamer *getBitcodeFileStreamer(const std::string &Filename,
+                                        std::string *Err);
+
+}
+
+#endif  // LLVM_SUPPORT_BITCODESTREAM_H_