Implement the semantics of the injected-class-name within a class

template. The injected-class-name is either a type or a template,
depending on whether a '<' follows it. As a type, the
injected-class-name's template argument list contains its template
parameters in declaration order.

As part of this, add logic for canonicalizing declarations, and be
sure to canonicalize declarations used in template names and template
arguments. 

A TagType is dependent if the declaration it references is dependent.

I'm not happy about the rather complicated protocol needed to use
ASTContext::getTemplateSpecializationType.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71408 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
index 9aba33c943..621145f1af 100644
--- a/lib/AST/Decl.cpp
+++ b/lib/AST/Decl.cpp
@@ -14,6 +14,7 @@
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclTemplate.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Stmt.h"
 #include "clang/AST/Expr.h"
@@ -505,6 +506,18 @@ OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
 // TagDecl Implementation
 //===----------------------------------------------------------------------===//
 
+bool TagDecl::isDependentType() const {
+  if (isa<TemplateDecl>(this))
+    return true;
+
+  if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(getDeclContext()))
+    return TD->isDependentType();
+
+  // FIXME: Tag types declared function templates are dependent types.
+  // FIXME: Look through block scopes.
+  return false;
+}
+
 void TagDecl::startDefinition() {
   TagType *TagT = const_cast<TagType *>(TypeForDecl->getAsTagType());
   TagT->decl.setPointer(this);