[ASTImporter] Propagate errors during import of overridden methods.

Summary:
If importing overridden methods fails for a method it can be seen
incorrectly as non-virtual. To avoid this inconsistency the method
is marked with import error to avoid later use of it.

Reviewers: martong, a.sidorin, shafik, a_sidorin

Reviewed By: martong, shafik

Subscribers: rnkovacs, dkrupp, Szelethus, gamesh411, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D66933

llvm-svn: 370457

1 files changed, 11 insertions, 5 deletions

diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 19321fd0747..30ec1374ae4 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -639,7 +639,8 @@ namespace clang {
       return ImportArrayChecked(InContainer.begin(), InContainer.end(), Obegin);
     }
 
-    void ImportOverrides(CXXMethodDecl *ToMethod, CXXMethodDecl *FromMethod);
+    Error ImportOverriddenMethods(CXXMethodDecl *ToMethod,
+                                  CXXMethodDecl *FromMethod);
 
     Expected<FunctionDecl *> FindFunctionTemplateSpecialization(
         FunctionDecl *FromFD);
@@ -3370,7 +3371,9 @@ ExpectedDecl ASTNodeImporter::VisitFunctionDecl(FunctionDecl *D) {
   }
 
   if (auto *FromCXXMethod = dyn_cast<CXXMethodDecl>(D))
-    ImportOverrides(cast<CXXMethodDecl>(ToFunction), FromCXXMethod);
+    if (Error Err = ImportOverriddenMethods(cast<CXXMethodDecl>(ToFunction),
+                                            FromCXXMethod))
+      return std::move(Err);
 
   // Import the rest of the chain. I.e. import all subsequent declarations.
   for (++RedeclIt; RedeclIt != Redecls.end(); ++RedeclIt) {
@@ -7804,15 +7807,18 @@ ExpectedStmt ASTNodeImporter::VisitCXXTypeidExpr(CXXTypeidExpr *E) {
       *ToTypeOrErr, *ToExprOperandOrErr, *ToSourceRangeOrErr);
 }
 
-void ASTNodeImporter::ImportOverrides(CXXMethodDecl *ToMethod,
-                                      CXXMethodDecl *FromMethod) {
+Error ASTNodeImporter::ImportOverriddenMethods(CXXMethodDecl *ToMethod,
+                                               CXXMethodDecl *FromMethod) {
+  Error ImportErrors = Error::success();
   for (auto *FromOverriddenMethod : FromMethod->overridden_methods()) {
     if (auto ImportedOrErr = import(FromOverriddenMethod))
       ToMethod->getCanonicalDecl()->addOverriddenMethod(cast<CXXMethodDecl>(
           (*ImportedOrErr)->getCanonicalDecl()));
     else
-      consumeError(ImportedOrErr.takeError());
+      ImportErrors =
+          joinErrors(std::move(ImportErrors), ImportedOrErr.takeError());
   }
+  return ImportErrors;
 }
 
 ASTImporter::ASTImporter(ASTContext &ToContext, FileManager &ToFileManager,