DiagnoseUnknownTypename always emits a diagnostic and returns true

Make it return void and delete the dead code in the parser that handled
the case where it might return false.  This has been dead since 2010
when John deleted Action.h.

llvm-svn: 211248

clang/include/clang/Basic/DiagnosticParseKinds.td

@@ -333,8 +333,6 @@ def warn_vector_long_decl_spec_combination : Warning<
   "Use of 'long' with '__vector' is deprecated">, InGroup<Deprecated>;
 def err_friend_invalid_in_context : Error<
   "'friend' used outside of class">;
-def err_unknown_typename : Error<
-  "unknown type name %0">;
 def err_use_of_tag_name_without_tag : Error<
   "must use '%1' tag to refer to type %0%select{| in this scope}2">;
 def err_templated_using_directive : Error<

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -6828,6 +6828,8 @@ def warn_direct_ivar_access : Warning<"instance variable %0 is being "
   "directly accessed">, InGroup<DiagGroup<"direct-ivar-access">>, DefaultIgnore;
 
 // Spell-checking diagnostics
+def err_unknown_typename : Error<
+  "unknown type name %0">;
 def err_unknown_type_or_class_name_suggest : Error<
   "unknown %select{type|class}1 name %0; did you mean %2?">;
 def err_unknown_typename_suggest : Error<

clang/include/clang/Sema/Sema.h

@@ -1408,7 +1408,7 @@ public:
                          IdentifierInfo **CorrectedII = nullptr);
   TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
   bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
-  bool DiagnoseUnknownTypeName(IdentifierInfo *&II,
+  void DiagnoseUnknownTypeName(IdentifierInfo *&II,
                                SourceLocation IILoc,
                                Scope *S,
                                CXXScopeSpec *SS,

clang/lib/Parse/ParseDecl.cpp

@@ -2170,42 +2170,33 @@ bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
     }
   }
 
-  // This is almost certainly an invalid type name. Let the action emit a
-  // diagnostic and attempt to recover.
+  // This is almost certainly an invalid type name. Let Sema emit a diagnostic
+  // and attempt to recover.
   ParsedType T;
   IdentifierInfo *II = Tok.getIdentifierInfo();
-  if (Actions.DiagnoseUnknownTypeName(II, Loc, getCurScope(), SS, T,
-                                      getLangOpts().CPlusPlus &&
-                                          NextToken().is(tok::less))) {
-    // The action emitted a diagnostic, so we don't have to.
-    if (T) {
-      // The action has suggested that the type T could be used. Set that as
-      // the type in the declaration specifiers, consume the would-be type
-      // name token, and we're done.
-      const char *PrevSpec;
-      unsigned DiagID;
-      DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
-                         Actions.getASTContext().getPrintingPolicy());
-      DS.SetRangeEnd(Tok.getLocation());
-      ConsumeToken();
-      // There may be other declaration specifiers after this.
-      return true;
-    } else if (II != Tok.getIdentifierInfo()) {
-      // If no type was suggested, the correction is to a keyword
-      Tok.setKind(II->getTokenID());
-      // There may be other declaration specifiers after this.
-      return true;
-    }
-
-    // Fall through; the action had no suggestion for us.
-  } else {
-    // The action did not emit a diagnostic, so emit one now.
-    SourceRange R;
-    if (SS) R = SS->getRange();
-    Diag(Loc, diag::err_unknown_typename) << Tok.getIdentifierInfo() << R;
+  Actions.DiagnoseUnknownTypeName(II, Loc, getCurScope(), SS, T,
+                                  getLangOpts().CPlusPlus &&
+                                      NextToken().is(tok::less));
+  if (T) {
+    // The action has suggested that the type T could be used. Set that as
+    // the type in the declaration specifiers, consume the would-be type
+    // name token, and we're done.
+    const char *PrevSpec;
+    unsigned DiagID;
+    DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
+                       Actions.getASTContext().getPrintingPolicy());
+    DS.SetRangeEnd(Tok.getLocation());
+    ConsumeToken();
+    // There may be other declaration specifiers after this.
+    return true;
+  } else if (II != Tok.getIdentifierInfo()) {
+    // If no type was suggested, the correction is to a keyword
+    Tok.setKind(II->getTokenID());
+    // There may be other declaration specifiers after this.
+    return true;
   }
 
-  // Mark this as an error.
+  // Otherwise, the action had no suggestion for us.  Mark this as an error.
   DS.SetTypeSpecError();
   DS.SetRangeEnd(Tok.getLocation());
   ConsumeToken();

clang/lib/Sema/SemaDecl.cpp

@@ -438,7 +438,7 @@ bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
   return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
 }
 
-bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
+void Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
                                    SourceLocation IILoc,
                                    Scope *S,
                                    CXXScopeSpec *SS,
@@ -483,7 +483,7 @@ bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
                                   /*IsCtorOrDtorName=*/false,
                                   /*NonTrivialTypeSourceInfo=*/true);
     }
-    return true;
+    return;
   }
 
   if (getLangOpts().CPlusPlus) {
@@ -502,7 +502,7 @@ bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
         Diag(TplDecl->getLocation(), diag::note_template_decl_here)
           << TplDecl->getTemplateParameters()->getSourceRange();
       }
-      return true;
+      return;
     }
   }
 
@@ -529,8 +529,6 @@ bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
     assert(SS && SS->isInvalid() && 
            "Invalid scope specifier has already been diagnosed");
   }
-  
-  return true;
 }
 
 /// \brief Determine whether the given result set contains either a type name