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| author | Douglas Gregor <dgregor@apple.com> | 2015-07-07 03:58:54 +0000 |
|---|---|---|
| committer | Douglas Gregor <dgregor@apple.com> | 2015-07-07 03:58:54 +0000 |
| commit | 1ac1b63c9ca898e66aae9775cca6045082907b9a (patch) | |
| tree | b9196b185b0185c84e60f99881aaffd69f4da93d /clang/lib/AST/ASTImporter.cpp | |
| parent | ab209d83be5dadff4f17364a71f323b89e3c63f8 (diff) | |
| download | bcm5719-llvm-1ac1b63c9ca898e66aae9775cca6045082907b9a.tar.gz bcm5719-llvm-1ac1b63c9ca898e66aae9775cca6045082907b9a.zip | |
Implement variance for Objective-C type parameters.
Introduce co- and contra-variance for Objective-C type parameters,
which allows us to express that (for example) an NSArray is covariant
in its type parameter. This means that NSArray<NSMutableString *> * is
a subtype of NSArray<NSString *> *, which is expected of the immutable
Foundation collections.
Type parameters can be annotated with __covariant or __contravariant
to make them co- or contra-variant, respectively. This feature can be
detected by __has_feature(objc_generics_variance). Implements
rdar://problem/20217490.
llvm-svn: 241549
Diffstat (limited to 'clang/lib/AST/ASTImporter.cpp')
| -rw-r--r-- | clang/lib/AST/ASTImporter.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp index d264e962beb..8460030b4b2 100644 --- a/clang/lib/AST/ASTImporter.cpp +++ b/clang/lib/AST/ASTImporter.cpp @@ -3452,6 +3452,8 @@ Decl *ASTNodeImporter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) { ObjCTypeParamDecl *Result = ObjCTypeParamDecl::Create( Importer.getToContext(), DC, + D->getVariance(), + Importer.Import(D->getVarianceLoc()), D->getIndex(), Importer.Import(D->getLocation()), Name.getAsIdentifierInfo(), |
