Handle Objective-C type arguments.

Objective-C type arguments can be provided in angle brackets following
an Objective-C interface type. Syntactically, this is the same
position as one would provide protocol qualifiers (e.g.,
id<NSCopying>), so parse both together and let Sema sort out the
ambiguous cases. This applies both when parsing types and when parsing
the superclass of an Objective-C class, which can now be a specialized
type (e.g., NSMutableArray<T> inherits from NSArray<T>).

Check Objective-C type arguments against the type parameters of the
corresponding class. Verify the length of the type argument list and
that each type argument satisfies the corresponding bound.

Specializations of parameterized Objective-C classes are represented
in the type system as distinct types. Both specialized types (e.g.,
NSArray<NSString *> *) and unspecialized types (NSArray *) are
represented, separately.

llvm-svn: 241542

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Sema/DeclSpec.cpp b/clang/lib/Sema/DeclSpec.cpp
index d5c8871cac8..5c75536e94a 100644
--- a/clang/lib/Sema/DeclSpec.cpp
+++ b/clang/lib/Sema/DeclSpec.cpp
@@ -893,6 +893,7 @@ bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
   return false;
 }
 
+
 bool DeclSpec::SetConceptSpec(SourceLocation Loc, const char *&PrevSpec,
                               unsigned &DiagID) {
   if (Concept_specified) {
@@ -905,6 +906,16 @@ bool DeclSpec::SetConceptSpec(SourceLocation Loc, const char *&PrevSpec,
   return false;
 }
 
+void DeclSpec::setObjCTypeArgs(SourceLocation lAngleLoc,
+                               ArrayRef<ParsedType> args,
+                               SourceLocation rAngleLoc) {
+  ParsedType *argsCopy = new ParsedType[args.size()];
+  memcpy(argsCopy, args.data(), args.size() * sizeof(ParsedType));
+  ObjCTypeArgs = llvm::makeArrayRef(argsCopy, args.size());
+  ObjCTypeArgsLAngleLoc = lAngleLoc;
+  ObjCTypeArgsRAngleLoc = rAngleLoc;
+}
+
 void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
                                      unsigned NP,
                                      SourceLocation *ProtoLocs,