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. 



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86777 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index 5cee9884ce..394d35891d 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -2185,6 +2185,14 @@ PCHReader::GetTemplateArgumentLocInfo(TemplateArgument::ArgKind Kind,
     return ReadDeclExpr();
   case TemplateArgument::Type:
     return GetDeclaratorInfo(Record, Index);
+  case TemplateArgument::Template: {
+    SourceLocation 
+      QualStart = SourceLocation::getFromRawEncoding(Record[Index++]),
+      QualEnd = SourceLocation::getFromRawEncoding(Record[Index++]),
+      TemplateNameLoc = SourceLocation::getFromRawEncoding(Record[Index++]);
+    return TemplateArgumentLocInfo(SourceRange(QualStart, QualEnd),
+                                   TemplateNameLoc);
+  }
   case TemplateArgument::Null:
   case TemplateArgument::Integral:
   case TemplateArgument::Declaration: