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/* Top level entry point of Bison.
Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000-2002, 2004-2015,
2018-2020 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "system.h"
#include <bitset.h>
#include <bitset/stats.h>
#include <closeout.h>
#include <configmake.h>
#include <progname.h>
#include <quote.h>
#include <quotearg.h>
#include <relocatable.h> /* relocate2 */
#include <timevar.h>
#include "complain.h"
#include "conflicts.h"
#include "derives.h"
#include "files.h"
#include "fixits.h"
#include "getargs.h"
#include "gram.h"
#include "ielr.h"
#include "lalr.h"
#include "lr0.h"
#include "muscle-tab.h"
#include "nullable.h"
#include "output.h"
#include "print-graph.h"
#include "print-xml.h"
#include "print.h"
#include "reader.h"
#include "reduce.h"
#include "scan-code.h"
#include "scan-gram.h"
#include "scan-skel.h"
#include "symtab.h"
#include "tables.h"
#include "uniqstr.h"
int
main (int argc, char *argv[])
{
#define DEPENDS_ON_LIBINTL 1
set_program_name (argv[0]);
setlocale (LC_ALL, "");
{
char const *cp = getenv ("LC_CTYPE");
if (cp && STREQ (cp, "C"))
set_custom_quoting ("e_quoting_options, "'", "'");
else
set_quoting_style ("e_quoting_options, locale_quoting_style);
}
atexit (close_stdout);
uniqstrs_new ();
muscle_init ();
complain_init ();
getargs (argc, argv);
timevar_enabled = trace_flag & trace_time;
timevar_init ();
timevar_start (tv_total);
if (trace_flag & trace_bitsets)
bitset_stats_enable ();
/* 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. */
timevar_push (tv_reader);
reader (grammar_file);
timevar_pop (tv_reader);
if (complaint_status == status_complaint)
goto finish;
/* Find useless nonterminals and productions and reduce the grammar. */
timevar_push (tv_reduce);
reduce_grammar ();
timevar_pop (tv_reduce);
/* Record other info about the grammar. In files derives and
nullable. */
timevar_push (tv_sets);
derives_compute ();
nullable_compute ();
timevar_pop (tv_sets);
/* Compute LR(0) parser states. See state.h for more info. */
timevar_push (tv_lr0);
generate_states ();
timevar_pop (tv_lr0);
/* Add lookahead sets to parser states. Except when LALR(1) is
requested, split states to eliminate LR(1)-relative
inadequacies. */
ielr ();
/* Find and record any conflicts: places where one token of
lookahead is not enough to disambiguate the parsing. In file
conflicts. Also resolve s/r conflicts based on precedence
declarations. */
timevar_push (tv_conflicts);
conflicts_solve ();
if (!muscle_percent_define_flag_if ("lr.keep-unreachable-state"))
{
state_number *old_to_new = xnmalloc (nstates, sizeof *old_to_new);
state_number nstates_old = nstates;
state_remove_unreachable_states (old_to_new);
lalr_update_state_numbers (old_to_new, nstates_old);
conflicts_update_state_numbers (old_to_new, nstates_old);
free (old_to_new);
}
conflicts_print ();
timevar_pop (tv_conflicts);
/* Compute the parser tables. */
timevar_push (tv_actions);
tables_generate ();
timevar_pop (tv_actions);
grammar_rules_useless_report (_("rule useless in parser due to conflicts"));
print_precedence_warnings ();
/* Whether to generate output files. */
bool generate = !(feature_flag & feature_syntax_only);
if (generate)
{
/* Output file names. */
compute_output_file_names ();
/* Output the detailed report on the grammar. */
if (report_flag)
{
timevar_push (tv_report);
print_results ();
timevar_pop (tv_report);
}
/* Output the graph. */
if (graph_flag)
{
timevar_push (tv_graph);
print_graph ();
timevar_pop (tv_graph);
}
/* Output xml. */
if (xml_flag)
{
timevar_push (tv_xml);
print_xml ();
timevar_pop (tv_xml);
}
}
/* Stop if there were errors, to avoid trashing previous output
files. */
if (complaint_status == status_complaint)
goto finish;
/* Lookahead tokens are no longer needed. */
timevar_push (tv_free);
lalr_free ();
timevar_pop (tv_free);
/* Output the tables and the parser to ftable. In file output. */
if (generate)
{
timevar_push (tv_parser);
output ();
timevar_pop (tv_parser);
}
finish:
timevar_push (tv_free);
nullable_free ();
derives_free ();
tables_free ();
states_free ();
reduce_free ();
conflicts_free ();
grammar_free ();
output_file_names_free ();
/* The scanner memory cannot be released right after parsing, as it
contains things such as user actions, prologue, epilogue etc. */
gram_scanner_free ();
muscle_free ();
code_scanner_free ();
skel_scanner_free ();
timevar_pop (tv_free);
if (trace_flag & trace_bitsets)
bitset_stats_dump (stderr);
/* Stop timing and print the times. */
timevar_stop (tv_total);
timevar_print (stderr);
/* Fix input file now, even if there are errors: that's less
warnings in the following runs. */
if (!fixits_empty ())
{
if (update_flag)
fixits_run ();
else
complain (NULL, Wother,
_("fix-its can be applied. Rerun with option '--update'."));
fixits_free ();
}
uniqstrs_free ();
complain_free ();
quotearg_free ();
return complaint_status ? EXIT_FAILURE : EXIT_SUCCESS;
}
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