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Re: [GNU bison 1.75b] testsuite.log: 14 failures
From: |
Akim Demaille |
Subject: |
Re: [GNU bison 1.75b] testsuite.log: 14 failures |
Date: |
Thu, 09 Jan 2003 18:51:20 +0100 |
User-agent: |
Gnus/5.090008 (Oort Gnus v0.08) Emacs/21.2 (i386-pc-linux-gnu) |
>> I see no incompatibility with Bison 1.35 (the last "old" version of
>> Bison), since any grammar that works with Bison 1.35 must lack
>> %parse-param, so Bison 1.50 and later will still generate C code that
>> invokes yyerror with just one argument.
Bruce> Certainly 1.33 and IIRC earlier versions had the ability to generate
Bruce> reentrant parsers (though with a mechanism different than a %-option)
Bruce> with additional parameters but with no change to the yyerror calling
Bruce> convention. Indeed, the mechanisms used in those versions still appear
Bruce> to work with 1.75b in lieu of %parse-param (which is incompatible with
Bruce> earlier versions of bison).
Hi Bruce,
Yes, indeed, one can use #define macros to have a pseudo reentrant
parser by adding new arguements to yyparse, and new argument to
yylex. But this was far from being satisfying and led to many people
#defining yyerror to steal internal variables. So a new scheme had to
be found, into which _real_ reentrancy could be acheived, whatever the
programming language, whatever the type of parser. This is lex-param
and parse-param.
Now, as far as error-param is concerned, parse-param was sufficient
for the cases I and others faced. I'm not inclined to add yet another
primitive.
- Re: [GNU bison 1.75b] testsuite.log: 14 failures,
Akim Demaille <=