[libclang] Introduce clang_getFileUniqueID which returns a struct

for a CXFile containing device/inode/modification time.

Intended to be useful as a key associated with a unique file across
an indexing session.

rdar://13091837

llvm-svn: 173559

1 files changed, 19 insertions, 1 deletions

diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
index 6fa8296bdfb..2a66e7a798e 100644
--- a/clang/include/clang-c/Index.h
+++ b/clang/include/clang-c/Index.h
@@ -32,7 +32,7 @@
  * compatible, thus CINDEX_VERSION_MAJOR is expected to remain stable.
  */
 #define CINDEX_VERSION_MAJOR 0
-#define CINDEX_VERSION_MINOR 10
+#define CINDEX_VERSION_MINOR 11
 
 #define CINDEX_VERSION_ENCODE(major, minor) ( \
       ((major) * 10000)                       \
@@ -297,6 +297,24 @@ CINDEX_LINKAGE CXString clang_getFileName(CXFile SFile);
 CINDEX_LINKAGE time_t clang_getFileTime(CXFile SFile);
 
 /**
+ * \brief Uniquely identifies a CXFile, that refers to the same underlying file,
+ * across an indexing session.
+ */
+typedef struct {
+  unsigned long long data[3];
+} CXFileUniqueID;
+
+/**
+ * \brief Retrieve the unique ID for the given \c file.
+ *
+ * \param file the file to get the ID for.
+ * \param outID stores the returned CXFileUniqueID.
+ * \returns If there was a failure getting the unique ID, returns non-zero,
+ * otherwise returns 0.
+*/
+CINDEX_LINKAGE int clang_getFileUniqueID(CXFile file, CXFileUniqueID *outID);
+
+/**
  * \brief Determine whether the given header is guarded against
  * multiple inclusions, either with the conventional
  * \#ifndef/\#define/\#endif macro guards or with \#pragma once.