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Re: $$ in parse.y question(c++)
- To: Andreas Schwab <schwab at suse dot de>
- Subject: Re: $$ in parse.y question(c++)
- From: Gerald Pfeifer <pfeifer at dbai dot tuwien dot ac dot at>
- Date: Tue, 9 Jan 2001 02:39:52 +0100 (CET)
- cc: Dave Raggett <dave_raggett at hotmail dot com>, <gcc at gcc dot gnu dot org>
On 6 Jan 2001, Andreas Schwab wrote:
> "Dave Raggett" <dave_raggett@hotmail.com> writes:
>|> In parse.y(gcc/cp/parse.y),I find such code:
>|> expr_no_commas:
>|> | expr_no_commas '+' expr_no_commas
>|> { $$ = build_x_binary_op ($2, $$, $3); }
>|>
>|> why not { $$ = build_x_binary_op ($2, $1, $3); }??
> Because Bison implicitly prepends "$$ = $1" to every action.
This is not really, well, intuitive, is it?
Dave, would you be willing to submit a patch to clean this up?
Gerald
--
Gerald "Jerry" pfeifer@dbai.tuwien.ac.at http://www.dbai.tuwien.ac.at/~pfeifer/