[antlr-interest] How to define multi and div?

[=?GB2312?B?0MLC8g==?=]

I'm studing the expression parsing.
here I define the multi expr and div expr.

multiExpr
     :     (parenExpr | divExpr) (MULTI^ parenExpr)+
     ;
divExpr
      :    (parenExpr | multiExpr) (DIV^ parenExpr)+
      ;


this define raised recurse error. thoe in fact, the left of  multi expr can
be div expr.and each other.

can you give me some suggest ?
thanks~
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