[antlr-interest] cgram and SEMI! usage

[jenlhunt2003]

When I run a simple one line program:

double d;

through StdCParser and GnuCTreeParser displaying the nodes in the tree parser I get:

...

   < initDecl()
  < initDeclList()
<AST>: unexpected AST node: <ASTNULL>
 < declaration()
<externalDef()

This appears to occur because in StdCParser.g we have:

declaration
        { ANTLR_USE_NAMESPACE(antlr)RefAST /*AST*/ ds1 = NULL; }
        :       ds:declSpecifiers       { ds1 = astFactory->dupList(#ds); }
                (                       
                    initDeclList[ds1]
                )?
                SEMI!
                                        { ## = #( #[NDeclaration], ##); }
        ;

Whereas in GnuCTreeParser.g we have:

declaration
        :       #( NDeclaration
                    declSpecifiers
                    (                   
                        initDeclList
                    )?
                    ( SEMI )+
                )
        ;

*************************

If I take out the ! after SEMI in the Parser .g file I don't get the error.
It would appear that the tree parser is expecting a SEMI AST, but the parser 
is not generating one.  Some other tree parser code that I've examined omits 
things like SEMI, so I'd appreciate some insight here.

Thank you in advance,

Henry








 

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