[PATCH] D44449: [Parser] Fix assertion-on-invalid for unexpected typename.

[Volodymyr Sapsai via Phabricator via cfe-commits]

vsapsai created this revision.
vsapsai added reviewers: rsmith, arphaman.
Herald added a subscriber: jkorous-apple.

In `ParseDeclarationSpecifiers` for the code

  class A typename A;

we were able to annotate token `kw_typename` because it refers to
existing type. But later during processing token `annot_typename` we
failed to `SetTypeSpecType` and exited switch statement leaving
annotation token unconsumed. The code after the switch statement failed
because it didn't expect a special token.

The fix is not to assume that switch statement consumes all special
tokens and consume any token, not just non-special.

rdar://problem/37099386


https://reviews.llvm.org/D44449

Files:
  clang/lib/Parse/ParseDecl.cpp
  clang/test/Parser/cxx-decl.cpp


Index: clang/test/Parser/cxx-decl.cpp
===================================================================
--- clang/test/Parser/cxx-decl.cpp
+++ clang/test/Parser/cxx-decl.cpp
@@ -298,6 +298,11 @@
   }
 }
 
+namespace rdar37099386 {
+  class A typename A; // expected-error {{expected a qualified name after 'typename'}}
+  // expected-error at -1 {{cannot combine with previous 'class' declaration specifier}}
+}
+
 // PR8380
 extern ""      // expected-error {{unknown linkage language}}
 test6a { ;// expected-error {{C++ requires a type specifier for all declarations}}
Index: clang/lib/Parse/ParseDecl.cpp
===================================================================
--- clang/lib/Parse/ParseDecl.cpp
+++ clang/lib/Parse/ParseDecl.cpp
@@ -3799,7 +3799,7 @@
 
     DS.SetRangeEnd(Tok.getLocation());
     if (DiagID != diag::err_bool_redeclaration)
-      ConsumeToken();
+      ConsumeAnyToken();
 
     AttrsLastTime = false;
   }


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