* Hacking Parsing to be re-entrant
@ 2007-03-30 13:30 Joel Reymont
0 siblings, 0 replies; only message in thread
From: Joel Reymont @ 2007-03-30 13:30 UTC (permalink / raw)
To: Caml List
Folks,
It seems that the global state in the Parsing module is confined to
let env =
{ s_stack = Array.create 100 0;
v_stack = Array.create 100 (Obj.repr ());
symb_start_stack = Array.create 100 dummy_pos;
symb_end_stack = Array.create 100 dummy_pos;
stacksize = 100;
stackbase = 0;
curr_char = 0;
lval = Obj.repr ();
symb_start = dummy_pos;
symb_end = dummy_pos;
asp = 0;
rule_len = 0;
rule_number = 0;
sp = 0;
state = 0;
errflag = 0 }
To make a parser generated by ocamlyacc re-entrant one would need to
pass env as argument to any function that uses it (a handful) as well
as make ocamlyacc include it in the parser entry function together
with yytables, etc.
let program (lexfun : Lexing.lexbuf -> token) (lexbuf : Lexing.lexbuf) =
(Parsing.yyparse yytables 1 lexfun lexbuf : Easy.program)
Am I missing something crucial here or is this an easy hack?
Thanks, Joel
--
http://wagerlabs.com/
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