* doc/bison.texinfo (Stack Overflow): xref to Recursion.

[bison.git] / src / main.c

diff --git a/src/main.c b/src/main.c
index e27e1a547544a725f52e89edd68ef7ba6ecd4160..b5a8e0010cba635f13dead55b0e107927e6cb2b6 100644 (file)
--- a/src/main.c
+++ b/src/main.c
@@ -1,238 +1,181 @@
 /* Top level entry point of bison,
 /* Top level entry point of bison,

-   Copyright (C) 1984, 1986, 1989, 1992, 1995 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000, 2001, 2002
+   Free Software Foundation, Inc.

 
 

-This file is part of Bison, the GNU Compiler Compiler.
+   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 2, or (at your option)
-any later version.
+   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 2, 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.
+   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.  */
+   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, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */

 
 
 
 

-#include <stdio.h>

 #include "system.h"
 #include "system.h"

-#include "machine.h"   /* for MAXSHORT */
-
-extern int lineno;
-extern int verboseflag;
-
-/* Nonzero means failure has been detected; don't write a parser file.  */
-int failure;
+#include "bitset_stats.h"
+#include "bitset.h"
+#include "getargs.h"
+#include "symtab.h"
+#include "gram.h"
+#include "files.h"
+#include "complain.h"
+#include "derives.h"
+#include "tables.h"
+#include "output.h"
+#include "reader.h"
+#include "lalr.h"
+#include "reduce.h"
+#include "nullable.h"
+#include "print.h"
+#include "LR0.h"
+#include "conflicts.h"
+#include "print_graph.h"
+#include "muscle_tab.h"

 
 /* The name this program was run with, for messages.  */
 char *program_name;
 
 
 /* The name this program was run with, for messages.  */
 char *program_name;
 

-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();

 
 
 
 

-/* VMS complained about using `int'.  */
-

 int
 int

-main(argc, argv)
-     int argc;
-     char *argv[];
+main (int argc, char *argv[])

 {
   program_name = argv[0];
 {
   program_name = argv[0];

-  failure = 0;
-  lineno = 0;
-  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();
-  if (failure)
-       done(failure);
-
-  /* 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.
-     Also resolve s/r conflicts based on precedence declarations.  */
-  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);
-}
-\f
-/* functions to report errors which prevent a parser from being generated */
-
-
-/* Return a string containing a printable version of C:
-   either C itself, or the corresponding \DDD code.  */
-
-char *
-printable_version(c)
-     char c;
-{
-  static char buf[10];
-  if (c < ' ' || c >= '\177')
-    sprintf(buf, "\\%o", c);
-  else
-    {
-      buf[0] = c;
-      buf[1] = '\0';
-    }
-  return buf;
-}
-
-/* Generate a string from the integer I.
-   Return a ptr to internal memory containing the string.  */
-
-char *
-int_to_string(i)
-     int i;
-{
-  static char buf[20];
-  sprintf(buf, "%d", i);
-  return buf;
-}
-
-/* Print the message S for a fatal error.  */
-
-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);
-}
-
-
-/* Print a message for a fatal error.  Use FMT to construct the message
-   and incorporate string X1.  */
+  setlocale (LC_ALL, "");
+  (void) bindtextdomain (PACKAGE, LOCALEDIR);
+  (void) textdomain (PACKAGE);

 
 

-void
-fatals(fmt, x1)
-     char *fmt, *x1;
-{
-  char buffer[200];
-  sprintf(buffer, fmt, x1);
-  fatal(buffer);
-}
+  getargs (argc, argv);

 
 

-/* Print a warning message S.  */
+  time_report = trace_flag & trace_time;
+  init_timevar ();
+  timevar_start (TV_TOTAL);

 
 

-void
-warn(s)
-     char *s;
-{
-  extern char *infile;
+  if (trace_flag & trace_bitsets)
+    bitset_stats_enable ();

 
 

-  if (infile == 0)
-    fprintf(stderr, "error: %s\n", s);
-  else
-    fprintf(stderr, "(\"%s\", line %d) error: %s\n", 
-           infile, lineno, s);
+  muscle_init ();

 
 

-  failure = 1;
-}
+  /* 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.  */

 
 

-/* Print a warning message containing the string for the integer X1.
-   The message is given by the format FMT.  */
-
-void
-warni(fmt, x1)
-     char *fmt;
-     int x1;
-{
-  char buffer[200];
-  sprintf(buffer, fmt, x1);
-  warn(buffer);
-}
+  timevar_push (TV_READER);
+  reader ();
+  timevar_pop (TV_READER);

 
 

-/* Print a warning message containing the string X1.
-   The message is given by the format FMT.  */
+  if (complain_message_count)
+    exit (1);

 
 

-void
-warns(fmt, x1)
-     char *fmt, *x1;
-{
-  char buffer[200];
-  sprintf(buffer, fmt, x1);
-  warn(buffer);
-}
-
-/* Print a warning message containing the two strings X1 and X2.
-       The message is given by the format FMT.  */
-
-void
-warnss(fmt, x1, x2)
-     char *fmt, *x1, *x2;
-{
-  char buffer[200];
-  sprintf(buffer, fmt, x1, x2);
-  warn(buffer);
-}
+  /* Find useless nonterminals and productions and reduce the grammar. */
+  timevar_push (TV_REDUCE);
+  reduce_grammar ();
+  timevar_pop (TV_REDUCE);

 
 

-/* Print a warning message containing the 3 strings X1, X2, X3.
-   The message is given by the format FMT.  */
+  /* Record other info about the grammar.  In files derives and
+     nullable.  */
+  timevar_push (TV_SETS);
+  derives_compute ();
+  nullable_compute ();
+  timevar_pop (TV_SETS);

 
 

-void
-warnsss(fmt, x1, x2, x3)
-     char *fmt, *x1, *x2, *x3;
-{
-  char buffer[200];
-  sprintf(buffer, fmt, x1, x2, x3);
-  warn(buffer);
-}
-
-/* Print a message for the fatal occurence of more than MAXSHORT
-   instances of whatever is denoted by the string S.  */
+  /* Convert to nondeterministic finite state machine.  In file LR0.
+     See state.h for more info.  */
+  timevar_push (TV_LR0);
+  generate_states ();
+  timevar_pop (TV_LR0);

 
 

-void
-toomany(s)
-     char *s;
-{
-  char buffer[200];
-  sprintf(buffer, "limit of %d exceeded, too many %s", MAXSHORT, s);
-  fatal(buffer);
-}
+  /* make it deterministic.  In file lalr.  */
+  timevar_push (TV_LALR);
+  lalr ();
+  timevar_pop (TV_LALR);
+
+  /* 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 ();
+  conflicts_print ();
+  timevar_pop (TV_CONFLICTS);
+
+  /* Compute the parser tables.  */
+  timevar_push (TV_ACTIONS);
+  tables_generate ();
+  timevar_pop (TV_ACTIONS);
+
+  grammar_rules_never_reduced_report
+    (_("rule never reduced because of conflicts"));
+
+  /* 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);
+    }

 
 

-/* Abort for an internal error denoted by string S.  */
+  /* Output the VCG graph.  */
+  if (graph_flag)
+    {
+      timevar_push (TV_GRAPH);
+      print_graph ();
+      timevar_pop (TV_GRAPH);
+    }

 
 

-void
-berror(s)
-     char *s;
-{
-  fprintf(stderr, "internal error, %s\n", s);
-  abort();
+  /* Stop if there were errors, to avoid trashing previous output
+     files.  */
+  if (complain_message_count)
+    exit (1);
+
+  /* Lookaheads 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.  */
+  timevar_push (TV_PARSER);
+  output ();
+  timevar_pop (TV_PARSER);
+
+  timevar_push (TV_FREE);
+  nullable_free ();
+  derives_free ();
+  tables_free ();
+  states_free ();
+  reduce_free ();
+  conflicts_free ();
+  grammar_free ();
+
+  /* The scanner memory cannot be released right after parsing, as it
+     contains things such as user actions, prologue, epilogue etc.  */
+  scanner_free ();
+  muscle_free ();
+  /* If using alloca.c, flush the alloca'ed memory for the benefit of
+     people running Bison as a library in IDEs.  */
+#if C_ALLOCA
+  alloca (0);
+#endif
+  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);
+
+  return complain_message_count ? EXIT_FAILURE : EXIT_SUCCESS;

 }
 }