Re: Help with bison

Steve Horne <stephenhorne100@aol.com>
Fri, 27 Jul 2007 02:13:11 -0700

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Related articles
Help with bison drewpvogel@gmail.com (2007-07-26)
Re: Help with bison gene.ressler@gmail.com (Gene) (2007-07-26)
Re: Help with bison stephenhorne100@aol.com (Steve Horne) (2007-07-27)
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From: Steve Horne <stephenhorne100@aol.com>
Newsgroups: comp.compilers
Date: Fri, 27 Jul 2007 02:13:11 -0700
Organization: Compilers Central
References: 07-07-091
Keywords: yacc

drewpvo...@gmail.com wrote:


> The pertinent portion of Simple.y is:
> %union semrec /* The Semantic


I think that's your problem. You are only supposed to have one %union,
and Bison gives that the name YYSTYPE automatically. You have tried to
give it a name yourself, and so it ends up with two names.


A typical %union declaration might look like...


%union {
int m_Int_Result;
float m_Float_Result;
}


If you want to define other unions, just use the normal C syntax in
the %{ ... %} section.


For more complex parsers, it is more normal to define YYSTYPE as
either a base-class pointer or a simple integer (a key to access some
external data structure).


I don't think there's any way to give YYSTYPE another name. Section
3.8 of the manual (version 2.3) claims there's never any need.


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