Step #1 in adding headermap support to clang.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@45089 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 37 insertions, 0 deletions

diff --git a/include/clang/Lex/HeaderMap.h b/include/clang/Lex/HeaderMap.h
new file mode 100644
index 0000000000..7c79fe0447
--- /dev/null
+++ b/include/clang/Lex/HeaderMap.h
@@ -0,0 +1,37 @@
+//===--- HeaderMap.h - A file that acts like dir of symlinks ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the HeaderMap interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LEX_HEADERMAP_H
+#define LLVM_CLANG_LEX_HEADERMAP_H
+
+namespace clang {
+
+/// This class represents an Apple concept known as a 'header map'.  To the
+/// #include file resolution process, it basically acts like a directory of
+/// symlinks to files.  Its advantages are that it is dense and more efficient
+/// to create and process than a directory of symlinks.
+class HeaderMap {
+public:
+  /// HeaderMap::Create - This attempts to load the specified file as a header
+  /// map.  If it doesn't look like a HeaderMap, it gives up and returns null.
+  /// If it looks like a HeaderMap but is obviously corrupted, it puts a reason
+  /// into the string error argument and returns null.
+  static const HeaderMap *Create(const FileEntry *FE, std::string &ErrorInfo) { 
+    // FIXME: woot!
+    return 0; 
+  }
+};
+
+} // end namespace clang.
+
+#endif
\ No newline at end of file