[antlr-interest] TinyC

[Bryan Ewbank]

> The program is crashing out on the call parser.funclist()
> More specifically its a problem with the "ASTFactory".
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x08063b50 in
> antlr::ASTFactory::create(antlr::TokenRefCount<antlr::Token>) ()

Looks like you are generating a tree, right (e.g., buildAST=true). 
For this, you need an instance of the factory class; this is described
(buried ;-) on page 112 of the antlrman.pdf file in the distro:

quoting...

   New as of ANTLR 2.7.2 is that if you supply the
         buildAST=true
   option to a parser then you have to set and initialize an ASTFactory
   for the parser and treewalkers that use the resulting AST.
         ASTFactory my_factory; // generates CommonAST per default..
         MyParser parser( some−lexer );
         // Do setup from the AST factory repeat this for all parsers
using the AST
         parser.initializeASTFactory( my_factory );
         parser.setASTFactory( );

In other words, you need to call the initialize and set methods on the
parser /before/ you attempt to build a tree by calling your
parser.funclist() method.  Also, that same factory should be used by
all TreeParser classes in your pipeline.

I use a hand-written constructor that takes a second argument - the
AST factory - to help prevent me from forgetting this:

class P extends Parser;
options {
   noConstructors = true;
}
{
   public:
      P(antlr::TokenStream &lexer, antlr::ASTFactory *my_factory)
      : antlr::LLkParser(lexer,2)            // copied from default
generated constructor
      , ... ......                                    // other c'tor
initializations here, as needed
      {
         initializeASTFactory(*my_factory);
         setASTFactory(my_factory);
      }
}