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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/Serialization/ASTReaderDecl.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/Serialization/ASTReaderDecl.cpp')
| -rw-r--r-- | clang/lib/Serialization/ASTReaderDecl.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp index c54c5697e59..52019fcd328 100644 --- a/clang/lib/Serialization/ASTReaderDecl.cpp +++ b/clang/lib/Serialization/ASTReaderDecl.cpp @@ -904,7 +904,9 @@ void ASTDeclReader::VisitObjCMethodDecl(ObjCMethodDecl *MD) { void ASTDeclReader::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) { VisitTypedefNameDecl(D); + D->Variance = Record[Idx++]; D->Index = Record[Idx++]; + D->VarianceLoc = ReadSourceLocation(Record, Idx); D->ColonLoc = ReadSourceLocation(Record, Idx); } |
