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- /* Top level entry point of bison,
- Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
-
- This file is part of Bison, the GNU Compiler Compiler.
-
- Bison is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- Bison is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bison; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
- #include <stdio.h>
- #include "system.h"
- #include "machine.h" /* JF for MAXSHORT */
-
- #ifdef THINK_C
- #include <console.h>
- #endif
-
- extern int lineno;
- extern int verboseflag;
-
- /* Nonzero means failure has been detected; don't write a parser file. */
- int failure;
-
- extern void getargs(), openfiles(), reader(), reduce_grammar();
- extern void set_derives(), set_nullable(), generate_states();
- extern void lalr(), initialize_conflicts(), verbose(), terse();
- extern void output(), done(), abort();
-
-
- void
- main(argc, argv)
- int argc;
- char *argv[];
- {
- failure = 0;
- lineno = 0;
- #ifdef THINK_C
- argc = ccommand (&argv); /* simulate command-line arguments */
- #endif
- getargs(argc, argv);
- openfiles();
-
- /* read the input. Copy some parts of it to fguard, faction, ftable and fattrs.
- In file reader.c.
- The other parts are recorded in the grammar; see gram.h. */
- reader();
-
- /* find useless nonterminals and productions and reduce the grammar. In
- file reduce.c */
- reduce_grammar();
-
- /* record other info about the grammar. In files derives and nullable. */
- set_derives();
- set_nullable();
-
- /* convert to nondeterministic finite state machine. In file LR0.
- See state.h for more info. */
- generate_states();
-
- /* make it deterministic. In file lalr. */
- lalr();
-
- /* Find and record any conflicts: places where one token of lookahead is not
- enough to disambiguate the parsing. In file conflicts.
- Currently this does not do anything to resolve them;
- the trivial form of conflict resolution that exists is done in output. */
- initialize_conflicts();
-
- /* print information about results, if requested. In file print. */
- if (verboseflag)
- verbose();
- else
- terse();
-
- /* output the tables and the parser to ftable. In file output. */
- output();
- done(failure);
- }
-
- /* functions to report errors which prevent a parser from being generated */
-
- void
- fatal(s)
- char *s;
- {
- extern char *infile;
-
- if (infile == 0)
- fprintf(stderr, "fatal error: %s\n", s);
- else
- fprintf(stderr, "\"%s\", line %d: %s\n", infile, lineno, s);
- done(1);
- }
-
-
- /* JF changed to accept/deal with variable args. Is a real kludge since
- we don't support _doprnt calls */
- /*VARARGS1*/
-
- void
- fatals(fmt,x1,x2,x3,x4,x5,x6,x7,x8)
- char *fmt;
- {
- char buffer[200];
-
- sprintf(buffer, fmt, x1,x2,x3,x4,x5,x6,x7,x8);
- fatal(buffer);
- }
-
-
- void
- toomany(s)
- char *s;
- {
- char buffer[200];
-
- /* JF new msg */
- sprintf(buffer, "limit of %d exceeded, too many %s", MAXSHORT, s);
- fatal(buffer);
- }
-
-
- void
- berror(s)
- char *s;
- {
- fprintf(stderr, "internal error, %s\n", s);
- abort();
- }
-