On 1 Dec 2008, at 13:30, 山东 wrote:
...
I think it just uses the standard method as described in books like Aho, Sethi & Ullman, "Compilers..." (the "Dragon book"), an iteration until it stops. There is a more efficient method using Tarjan's SCC algorithm - search the archives for the Usenet newsgroup comp.compilers.
Hans _______________________________________________ help-bison@gnu.org http://lists.gnu.org/mailman/listinfo/help-bison