Add a 'RawPath' parameter to the PPCallbacks interface. This allows

clients to observe the exact path through which an #included file was
located. This is very useful when trying to record and replay inclusion
operations without it beind influenced by the aggressive caching done
inside the FileManager to avoid redundant system calls and filesystem
operations.

The work to compute and return this is only done in the presence of
callbacks, so it should have no effect on normal compilation.

Patch by Manuel Klimek.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127742 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 1 deletions

diff --git a/include/clang/Lex/HeaderMap.h b/include/clang/Lex/HeaderMap.h
index 8a5c83ecf4..54c7eb47c8 100644
--- a/include/clang/Lex/HeaderMap.h
+++ b/include/clang/Lex/HeaderMap.h
@@ -17,6 +17,7 @@
 namespace llvm {
   class MemoryBuffer;
   class StringRef;
+  template <typename T> class SmallVectorImpl;
 }
 namespace clang {
   class FileEntry;
@@ -47,7 +48,12 @@ public:
 
   /// LookupFile - Check to see if the specified relative filename is located in
   /// this HeaderMap.  If so, open it and return its FileEntry.
-  const FileEntry *LookupFile(llvm::StringRef Filename, FileManager &FM) const;
+  /// If RawPath is not NULL and the file is found, RawPath will be set to the
+  /// raw path at which the file was found in the file system. For example,
+  /// for a search path ".." and a filename "../file.h" this would be
+  /// "../../file.h".
+  const FileEntry *LookupFile(llvm::StringRef Filename, FileManager &FM,
+                              llvm::SmallVectorImpl<char> *RawPath) const;
 
   /// getFileName - Return the filename of the headermap.
   const char *getFileName() const;