Introduce a new representation for template template

parameters. Rather than storing them as either declarations (for the
non-dependent case) or expressions (for the dependent case), we now
(always) store them as TemplateNames. 

The primary change here is to add a new kind of TemplateArgument,
which stores a TemplateName. However, making that change ripples to
every switch on a TemplateArgument's kind, also affecting
TemplateArgumentLocInfo/TemplateArgumentLoc, default template
arguments for template template parameters, type-checking of template
template arguments, etc.

This change is light on testing. It should fix several pre-existing
problems with template template parameters, such as:
  - the inability to use dependent template names as template template
  arguments
  - template template parameter default arguments cannot be
  instantiation

However, there are enough pieces missing that more implementation is
required before we can adequately test template template parameters. 

llvm-svn: 86777

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Frontend/PCHWriter.cpp b/clang/lib/Frontend/PCHWriter.cpp
index 82922a93b59..2dcb8b0ceec 100644
--- a/clang/lib/Frontend/PCHWriter.cpp
+++ b/clang/lib/Frontend/PCHWriter.cpp
@@ -2122,6 +2122,12 @@ void PCHWriter::AddTemplateArgumentLoc(const TemplateArgumentLoc &Arg,
   case TemplateArgument::Type:
     AddDeclaratorInfo(Arg.getLocInfo().getAsDeclaratorInfo(), Record);
     break;
+  case TemplateArgument::Template:
+    Record.push_back(
+                   Arg.getTemplateQualifierRange().getBegin().getRawEncoding());
+    Record.push_back(Arg.getTemplateQualifierRange().getEnd().getRawEncoding());
+    Record.push_back(Arg.getTemplateNameLoc().getRawEncoding());
+    break;
   case TemplateArgument::Null:
   case TemplateArgument::Integral:
   case TemplateArgument::Declaration: