Additional Parameter to a Push and Pure Parser

[Flavius Aspra]

Hi

How can I pass one aditional parameter (not the token minor of type 
YYSTYPE) to the yypush_parse() function?

The parser is indeed reentrant, but this one aditional variable is 
crucial for the thread-safety of the application I need to integrate my 
parser in (it's a PHP extension, so we're talking about TSRM [1] - it 
allows me to create userland-attached variables in the action code).

I cannot just get rid of that parameter because inside the action code 
I'm going to call functions which will generate an AST in a 
userland-accessible form.

I've tried to hack around YYPUSH_DECLS and it works as far as declaring 
the function is concerned, BUT a few thousand LOCs down comes the 
implementation of yypush_parse, and I can't see any way to overwrite the 
function signature where the implementation of yypush_parse starts.

YYPARSE_PARAM is only used when the parser is not a push one (as far as 
I can tell), but in my case I NEED it be push because of the things I 
have to do in the processing loop, after lexing and prior to adding a 
new token to the parsing stack.

So I am wondering if there's a %directive or something that may help.

On the other side, I really think YYPARSE_PARAM should be used as far as 
it's defined, no matter what type of parser it is. It's a pity it's not.

Semantically speaking, the name YYPARSER_PARAM itself suggests that.

Thank you in advance,
Flavius

[1] http://devzone.zend.com/article/1021

--
Flavius Aspra

Student of Informatics | TU Graz