[ms-cxxabi] Handle template-template arguments

Template-template arguments appear to be a rather simple encoding of the
template's templated tag type.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187751 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/MicrosoftMangle.cpp b/lib/AST/MicrosoftMangle.cpp
index 68f57a9..fb3f87a 100644
--- a/lib/AST/MicrosoftMangle.cpp
+++ b/lib/AST/MicrosoftMangle.cpp
@@ -123,7 +123,7 @@
 #undef NON_CANONICAL_TYPE
 #undef TYPE
   
-  void mangleType(const TagType*);
+  void mangleType(const TagDecl *TD);
   void mangleDecayedArrayType(const ArrayType *T, bool IsGlobal);
   void mangleArrayType(const ArrayType *T);
   void mangleFunctionClass(const FunctionDecl *FD);
@@ -904,6 +904,9 @@
       mangleTemplateArg(TD, *I, ArgIndex);
     break;
   case TemplateArgument::Template:
+    mangleType(cast<TagDecl>(
+        TA.getAsTemplate().getAsTemplateDecl()->getTemplatedDecl()));
+    break;
   case TemplateArgument::TemplateExpansion: {
     // Issue a diagnostic.
     DiagnosticsEngine &Diags = Context.getDiags();
@@ -1407,13 +1410,13 @@
 // <class-type>  ::= V <name>
 // <enum-type>   ::= W <size> <name>
 void MicrosoftCXXNameMangler::mangleType(const EnumType *T, SourceRange) {
-  mangleType(cast<TagType>(T));
+  mangleType(cast<TagType>(T)->getDecl());
 }
 void MicrosoftCXXNameMangler::mangleType(const RecordType *T, SourceRange) {
-  mangleType(cast<TagType>(T));
+  mangleType(cast<TagType>(T)->getDecl());
 }
-void MicrosoftCXXNameMangler::mangleType(const TagType *T) {
-  switch (T->getDecl()->getTagKind()) {
+void MicrosoftCXXNameMangler::mangleType(const TagDecl *TD) {
+  switch (TD->getTagKind()) {
     case TTK_Union:
       Out << 'T';
       break;
@@ -1427,10 +1430,10 @@
     case TTK_Enum:
       Out << 'W';
       Out << getASTContext().getTypeSizeInChars(
-                cast<EnumDecl>(T->getDecl())->getIntegerType()).getQuantity();
+                cast<EnumDecl>(TD)->getIntegerType()).getQuantity();
       break;
   }
-  mangleName(T->getDecl());
+  mangleName(TD);
 }
 
 // <type>       ::= <array-type>