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Annotation of GNUtools/bison/main.c, revision 1.1.1.1

1.1       root        1: /* Top level entry point of bison,
                      2:    Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
                      3: 
                      4: This file is part of Bison, the GNU Compiler Compiler.
                      5: 
                      6: Bison is free software; you can redistribute it and/or modify
                      7: it under the terms of the GNU General Public License as published by
                      8: the Free Software Foundation; either version 2, or (at your option)
                      9: any later version.
                     10: 
                     11: Bison is distributed in the hope that it will be useful,
                     12: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     14: GNU General Public License for more details.
                     15: 
                     16: You should have received a copy of the GNU General Public License
                     17: along with Bison; see the file COPYING.  If not, write to
                     18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
                     19: 
                     20: 
                     21: #include <stdio.h>
                     22: #include "system.h"
                     23: #include "machine.h"   /* JF for MAXSHORT */
                     24: 
                     25: extern int lineno;
                     26: extern int verboseflag;
                     27: 
                     28: /* Nonzero means failure has been detected; don't write a parser file.  */
                     29: int failure;
                     30: 
                     31: /* The name this program was run with, for messages. */
                     32: char *program_name;
                     33: 
                     34: extern void getargs(), openfiles(), reader(), reduce_grammar();
                     35: extern void set_derives(), set_nullable(), generate_states();
                     36: extern void lalr(), initialize_conflicts(), verbose(), terse();
                     37: extern void output(), done();
                     38: 
                     39: 
                     40: /* VMS complained about using `int'.  */
                     41: int
                     42: main(argc, argv)
                     43: int argc;
                     44: char *argv[];
                     45: {
                     46:   program_name = argv[0];
                     47:   failure = 0;
                     48:   lineno = 0;
                     49:   getargs(argc, argv);
                     50:   openfiles();
                     51: 
                     52:   /* read the input.  Copy some parts of it to fguard, faction, ftable and fattrs.
                     53:      In file reader.c.
                     54:      The other parts are recorded in the grammar; see gram.h.  */
                     55:   reader();
                     56: 
                     57:   /* find useless nonterminals and productions and reduce the grammar.  In
                     58:      file reduce.c */
                     59:   reduce_grammar();
                     60: 
                     61:   /* record other info about the grammar.  In files derives and nullable.  */
                     62:   set_derives();
                     63:   set_nullable();
                     64: 
                     65:   /* convert to nondeterministic finite state machine.  In file LR0.
                     66:      See state.h for more info.  */
                     67:   generate_states();
                     68: 
                     69:   /* make it deterministic.  In file lalr.  */
                     70:   lalr();
                     71: 
                     72:   /* Find and record any conflicts: places where one token of lookahead is not
                     73:      enough to disambiguate the parsing.  In file conflicts.
                     74:      Currently this does not do anything to resolve them;
                     75:      the trivial form of conflict resolution that exists is done in output.  */
                     76:   initialize_conflicts();
                     77: 
                     78:   /* print information about results, if requested.  In file print. */
                     79:   if (verboseflag)
                     80:     verbose();
                     81:   else
                     82:     terse();
                     83: 
                     84:   /* output the tables and the parser to ftable.  In file output. */
                     85:   output();
                     86:   done(failure);
                     87: }
                     88: 
                     89: /* functions to report errors which prevent a parser from being generated */
                     90: 
                     91: void
                     92: fatal(s)
                     93: char *s;
                     94: {
                     95:   extern char *infile;
                     96: 
                     97:   if (infile == 0)
                     98:     fprintf(stderr, "fatal error: %s\n", s);
                     99:   else
                    100:     fprintf(stderr, "\"%s\", line %d: %s\n", infile, lineno, s);
                    101:   done(1);
                    102: }
                    103: 
                    104: 
                    105: /* JF changed to accept/deal with variable args.
                    106:    DO NOT change this to use varargs.  It will appear to work
                    107:    but will break on systems that don't have the necessary library
                    108:    functions.  This is the ONLY safe way to write such a function.  */
                    109: /*VARARGS1*/
                    110: 
                    111: void
                    112: fatals(fmt,x1,x2,x3,x4,x5,x6,x7,x8)
                    113: char *fmt;
                    114: {
                    115:   char buffer[200];
                    116: 
                    117:   sprintf(buffer, fmt, x1,x2,x3,x4,x5,x6,x7,x8);
                    118:   fatal(buffer);
                    119: }
                    120: 
                    121: 
                    122: void
                    123: toomany(s)
                    124: char *s;
                    125: {
                    126:   char buffer[200];
                    127: 
                    128:        /* JF new msg */
                    129:   sprintf(buffer, "limit of %d exceeded, too many %s", MAXSHORT, s);
                    130:   fatal(buffer);
                    131: }
                    132: 
                    133: 
                    134: void
                    135: berror(s)
                    136: char *s;
                    137: {
                    138:   fprintf(stderr, "internal error, %s\n", s);
                    139:   abort();
                    140: }

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