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, 13 insertions, 0 deletions

diff --git a/clang/lib/AST/TemplateBase.cpp b/clang/lib/AST/TemplateBase.cpp
index 94e1ca1e06e..18a574c89c2 100644
--- a/clang/lib/AST/TemplateBase.cpp
+++ b/clang/lib/AST/TemplateBase.cpp
@@ -58,6 +58,10 @@ void TemplateArgument::Profile(llvm::FoldingSetNodeID &ID,
     ID.AddPointer(getAsDecl()? getAsDecl()->getCanonicalDecl() : 0);
     break;
 
+  case Template:
+    ID.AddPointer(getAsTemplate().getAsVoidPointer());
+    break;
+      
   case Integral:
     getAsIntegral()->Profile(ID);
     getIntegralType().Profile(ID);
@@ -82,10 +86,19 @@ SourceRange TemplateArgumentLoc::getSourceRange() const {
   switch (Argument.getKind()) {
   case TemplateArgument::Expression:
     return getSourceExpression()->getSourceRange();
+      
   case TemplateArgument::Declaration:
     return getSourceDeclExpression()->getSourceRange();
+      
   case TemplateArgument::Type:
     return getSourceDeclaratorInfo()->getTypeLoc().getFullSourceRange();
+      
+  case TemplateArgument::Template:
+    if (getTemplateQualifierRange().isValid())
+      return SourceRange(getTemplateQualifierRange().getBegin(),
+                         getTemplateNameLoc());
+    return SourceRange(getTemplateNameLoc());
+      
   case TemplateArgument::Integral:
   case TemplateArgument::Pack:
   case TemplateArgument::Null: