From 7df89f5d180ddab85face93dfebe2be14b6f6bc8 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 5 Feb 2010 19:11:37 +0000
Subject: When we're parsing an expression that may have looked like a
 declaration, we can end up with template-id annotation tokens for types that
 have not been converted into type annotation tokens. When this is the case,
 translate the template-id into a type and parse as an expression.

llvm-svn: 95404
---
 clang/lib/Parse/ParseExpr.cpp | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

(limited to 'clang/lib/Parse/ParseExpr.cpp')

diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
index c6091367fd7..c763c2c6f65 100644
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -22,6 +22,7 @@
 #include "clang/Parse/Parser.h"
 #include "clang/Parse/DeclSpec.h"
 #include "clang/Parse/Scope.h"
+#include "clang/Parse/Template.h"
 #include "clang/Basic/PrettyStackTrace.h"
 #include "RAIIObjectsForParser.h"
 #include "llvm/ADT/SmallVector.h"
@@ -806,9 +807,44 @@ Parser::OwningExprResult Parser::ParseCastExpression(bool isUnaryExpression,
     return ParsePostfixExpressionSuffix(move(Res));
   }
 
-  case tok::annot_cxxscope: // [C++] id-expression: qualified-id
+  case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
+    Token Next = NextToken();
+    if (Next.is(tok::annot_template_id)) {
+      TemplateIdAnnotation *TemplateId
+        = static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue());
+      if (TemplateId->Kind == TNK_Type_template) {
+        // We have a qualified template-id that we know refers to a
+        // type, translate it into a type and continue parsing as a
+        // cast expression.
+        CXXScopeSpec SS;
+        ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
+        AnnotateTemplateIdTokenAsType(&SS);
+        return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
+                                   NotCastExpr, TypeOfCast);
+      }
+    }
+
+    // Parse as an id-expression.
+    Res = ParseCXXIdExpression(isAddressOfOperand);
+    return ParsePostfixExpressionSuffix(move(Res));
+  }
+
+  case tok::annot_template_id: { // [C++]          template-id
+    TemplateIdAnnotation *TemplateId
+      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
+    if (TemplateId->Kind == TNK_Type_template) {
+      // We have a template-id that we know refers to a type,
+      // translate it into a type and continue parsing as a cast
+      // expression.
+      AnnotateTemplateIdTokenAsType();
+      return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
+                                 NotCastExpr, TypeOfCast);
+    }
+
+    // Fall through to treat the template-id as an id-expression.
+  }
+
   case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
-  case tok::annot_template_id: // [C++]          template-id
     Res = ParseCXXIdExpression(isAddressOfOperand);
     return ParsePostfixExpressionSuffix(move(Res));
 
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