1 files changed, 38 insertions, 0 deletions
diff --git a/gnu/llvm/include/llvm/DebugInfo/PDB/Raw/IPDBStreamData.h b/gnu/llvm/include/llvm/DebugInfo/PDB/Raw/IPDBStreamData.h
new file mode 100644
index 00000000000..ab3c9f77075
--- /dev/null
+++ b/gnu/llvm/include/llvm/DebugInfo/PDB/Raw/IPDBStreamData.h
@@ -0,0 +1,38 @@
+//===- IPDBStreamData.h - Base interface for PDB Stream Data ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_PDB_RAW_IPDBSTREAMDATA_H
+#define LLVM_DEBUGINFO_PDB_RAW_IPDBSTREAMDATA_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Support/Endian.h"
+
+namespace llvm {
+namespace pdb {
+/// IPDBStream abstracts the notion of PDB stream data.  Although we already
+/// have another stream abstraction (namely in the form of StreamInterface
+/// and MappedBlockStream), they assume that the stream data is referenced
+/// the same way.  Namely, by looking in the directory to get the list of
+/// stream blocks, and by looking in the array of stream lengths to get the
+/// length.  This breaks down for the directory itself, however, since its
+/// length and list of blocks are stored elsewhere.  By abstracting the
+/// notion of stream data further, we can use a MappedBlockStream to read
+/// from the directory itself, or from an indexed stream which references
+/// the directory.
+class IPDBStreamData {
+public:
+  virtual ~IPDBStreamData() {}
+
+  virtual uint32_t getLength() = 0;
+  virtual ArrayRef<support::ulittle32_t> getStreamBlocks() = 0;
+};
+}
+}
+
+#endif