Introduce a new type, PackExpansionType, to capture types that are

pack expansions, e.g. given

  template<typename... Types> struct tuple;

  template<typename... Types>
  struct tuple_of_refs {
    typedef tuple<Types&...> types;
  };

the type of the "types" typedef is a PackExpansionType whose pattern
is Types&. 

This commit introduces support for creating pack expansions for
template type arguments, as above, but not for any other kind of pack
expansion, nor for any form of instantiation.

llvm-svn: 122223

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 26a54b1d55e..345cc8e74c7 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -298,6 +298,11 @@ ASTTypeWriter::VisitDependentTemplateSpecializationType(
   Code = TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION;
 }
 
+void ASTTypeWriter::VisitPackExpansionType(const PackExpansionType *T) {
+  Writer.AddTypeRef(T->getPattern(), Record);
+  Code = TYPE_PACK_EXPANSION;
+}
+
 void ASTTypeWriter::VisitParenType(const ParenType *T) {
   Writer.AddTypeRef(T->getInnerType(), Record);
   Code = TYPE_PAREN;
@@ -499,6 +504,9 @@ void TypeLocWriter::VisitDependentTemplateSpecializationTypeLoc(
     Writer.AddTemplateArgumentLocInfo(TL.getArgLoc(I).getArgument().getKind(),
                                       TL.getArgLoc(I).getLocInfo(), Record);
 }
+void TypeLocWriter::VisitPackExpansionTypeLoc(PackExpansionTypeLoc TL) {
+  Writer.AddSourceLocation(TL.getEllipsisLoc(), Record);
+}
 void TypeLocWriter::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
   Writer.AddSourceLocation(TL.getNameLoc(), Record);
 }