[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

2 files changed, 16 insertions, 0 deletions

diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 5d492417bae..a8517091acb 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2960,6 +2960,21 @@ unsigned clang_isFileMultipleIncludeGuarded(CXTranslationUnit tu, CXFile file) {
                                           .isFileMultipleIncludeGuarded(FEnt);
 }
 
+int clang_getFileUniqueID(CXFile file, CXFileUniqueID *outID) {
+  if (!file || !outID)
+    return 1;
+
+#ifdef LLVM_ON_WIN32
+  return 1; // inodes not supported on windows.
+#else
+  FileEntry *FEnt = static_cast<FileEntry *>(file);
+  outID->data[0] = FEnt->getDevice();
+  outID->data[1] = FEnt->getInode();
+  outID->data[2] = FEnt->getModificationTime();
+  return 0;
+#endif
+}
+
 } // end: extern "C"
 
 //===----------------------------------------------------------------------===//
diff --git a/clang/tools/libclang/libclang.exports b/clang/tools/libclang/libclang.exports
index 8f3c86318c7..616be4c635e 100644
--- a/clang/tools/libclang/libclang.exports
+++ b/clang/tools/libclang/libclang.exports
@@ -166,6 +166,7 @@ clang_getFile
 clang_getFileLocation
 clang_getFileName
 clang_getFileTime
+clang_getFileUniqueID
 clang_getFunctionTypeCallingConv
 clang_getIBOutletCollectionType
 clang_getIncludedFile