libclang: Allow callers of clang_saveTranslationUnit() to distinguish

between different classes of errors. Addresses most of
<rdar://problem/9660328>.

llvm-svn: 134495

2 files changed, 29 insertions, 5 deletions

diff --git a/clang/tools/c-index-test/c-index-test.c b/clang/tools/c-index-test/c-index-test.c
index 837fc8929e5..d1bdf96e710 100644
--- a/clang/tools/c-index-test/c-index-test.c
+++ b/clang/tools/c-index-test/c-index-test.c
@@ -1517,12 +1517,36 @@ int write_pch_file(const char *filename, int argc, const char *argv[]) {
     return 1;
   }
 
-  if (clang_saveTranslationUnit(TU, filename, clang_defaultSaveOptions(TU)))
-    fprintf(stderr, "Unable to write PCH file %s\n", filename);
+  int result = 0;
+  
+  switch (clang_saveTranslationUnit(TU, filename, 
+                                    clang_defaultSaveOptions(TU))) {
+  case CXSaveError_None:
+    break;
+
+  case CXSaveError_TranslationErrors:
+    fprintf(stderr, "Unable to write PCH file %s: translation errors\n", 
+            filename);
+    result = 2;    
+    break;
+
+  case CXSaveError_InvalidTU:
+    fprintf(stderr, "Unable to write PCH file %s: invalid translation unit\n", 
+            filename);
+    result = 3;    
+    break;
+
+  case CXSaveError_Unknown:
+  default:
+    fprintf(stderr, "Unable to write PCH file %s: unknown error \n", filename);
+    result = 1;
+    break;
+  }
+  
   clang_disposeTranslationUnit(TU);
   free_remapped_files(unsaved_files, num_unsaved_files);
   clang_disposeIndex(Idx);
-  return 0;  
+  return result;
 }
 
 /******************************************************************************/
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index fc331d077a9..b75850dd25d 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2594,9 +2594,9 @@ unsigned clang_defaultSaveOptions(CXTranslationUnit TU) {
 int clang_saveTranslationUnit(CXTranslationUnit TU, const char *FileName,
                               unsigned options) {
   if (!TU)
-    return 1;
+    return CXSaveError_InvalidTU;
   
-  int result = static_cast<ASTUnit *>(TU->TUData)->Save(FileName);
+  CXSaveError result = static_cast<ASTUnit *>(TU->TUData)->Save(FileName);
   if (getenv("LIBCLANG_RESOURCE_USAGE"))
     PrintLibclangResourceUsage(TU);
   return result;