[bison.git] / src / output.c

/* Output the generated parsing program for bison,
   Copyright (C) 1984, 1986, 1989, 1992 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 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.

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.  */


/* functions to output parsing data to various files.  Entries are:

  output_headers ()

Output constant strings to the beginning of certain files.

  output_trailers()

Output constant strings to the ends of certain files.

  output ()

Output the parsing tables and the parser code to ftable.

The parser tables consist of these tables.
Starred ones needed only for the semantic parser.
Double starred are output only if switches are set.

yytranslate = vector mapping yylex's token numbers into bison's token numbers.

** yytname = vector of string-names indexed by bison token number

** yytoknum = vector of yylex token numbers corresponding to entries in yytname

yyrline = vector of line-numbers of all rules.  For yydebug printouts.

yyrhs = vector of items of all rules.
        This is exactly what ritems contains.  For yydebug and for semantic
        parser.

yyprhs[r] = index in yyrhs of first item for rule r.

yyr1[r] = symbol number of symbol that rule r derives.

yyr2[r] = number of symbols composing right hand side of rule r.

* yystos[s] = the symbol number of the symbol that leads to state s.

yydefact[s] = default rule to reduce with in state s,
              when yytable doesn't specify something else to do.
              Zero means the default is an error.

yydefgoto[i] = default state to go to after a reduction of a rule that
               generates variable ntokens + i, except when yytable
               specifies something else to do.

yypact[s] = index in yytable of the portion describing state s.
            The lookahead token's type is used to index that portion
            to find out what to do.

            If the value in yytable is positive,
            we shift the token and go to that state.

            If the value is negative, it is minus a rule number to reduce by.

            If the value is zero, the default action from yydefact[s] is used.

yypgoto[i] = the index in yytable of the portion describing 
             what to do after reducing a rule that derives variable i + ntokens.
             This portion is indexed by the parser state number, s,
             as of before the text for this nonterminal was read.
             The value from yytable is the state to go to if 
             the corresponding value in yycheck is s.

yytable = a vector filled with portions for different uses,
          found via yypact and yypgoto.

yycheck = a vector indexed in parallel with yytable.
          It indicates, in a roundabout way, the bounds of the
          portion you are trying to examine.

          Suppose that the portion of yytable starts at index p
          and the index to be examined within the portion is i.
          Then if yycheck[p+i] != i, i is outside the bounds
          of what is actually allocated, and the default
          (from yydefact or yydefgoto) should be used.
          Otherwise, yytable[p+i] should be used.

YYFINAL = the state number of the termination state.
YYFLAG = most negative short int.  Used to flag ??
YYNTBASE = ntokens.

*/

#include <stdio.h>
#include "system.h"
#include "machine.h"
#include "alloc.h"
#include "files.h"
#include "gram.h"
#include "state.h"


extern int debugflag;
extern int nolinesflag;
extern int noparserflag;
extern int toknumflag;

extern char **tags;
extern int *user_toknums;
extern int tokensetsize;
extern int final_state;
extern core **state_table;
extern shifts **shift_table;
extern errs **err_table;
extern reductions **reduction_table;
extern short *accessing_symbol;
extern unsigned *LA;
extern short *LAruleno;
extern short *lookaheads;
extern char *consistent;
extern short *goto_map;
extern short *from_state;
extern short *to_state;
extern int lineno;

void output_headers PARAMS((void));
void output_trailers PARAMS((void));
void output PARAMS((void));
void output_token_translations PARAMS((void));
void output_gram PARAMS((void));
void output_stos PARAMS((void));
void output_rule_data PARAMS((void));
void output_defines PARAMS((void));
void output_actions PARAMS((void));
void token_actions PARAMS((void));
void save_row PARAMS((int));
void goto_actions PARAMS((void));
void save_column PARAMS((int, int));
void sort_actions PARAMS((void));
void pack_table PARAMS((void));
void output_base PARAMS((void));
void output_table PARAMS((void));
void output_check PARAMS((void));
void output_parser PARAMS((void));
void output_program PARAMS((void));
void free_shifts PARAMS((void));
void free_reductions PARAMS((void));
void free_itemsets PARAMS((void));
int action_row PARAMS((int));
int default_goto PARAMS((int));
int matching_state PARAMS((int));
int pack_vector PARAMS((int));

extern void berror PARAMS((char *));
extern void fatals PARAMS((char *, char *));
extern char *int_to_string PARAMS((int));
extern void reader_output_yylsp PARAMS((FILE *));

static int nvectors;
static int nentries;
static short **froms;
static short **tos;
static short *tally;
static short *width;
static short *actrow;
static short *state_count;
static short *order;
static short *base;
static short *pos;
static short *table;
static short *check;
static int lowzero;
static int high;



#define GUARDSTR        "\n#include \"%s\"\nextern int yyerror;\n\
extern int yycost;\nextern char * yymsg;\nextern YYSTYPE yyval;\n\n\
yyguard(n, yyvsp, yylsp)\nregister int n;\nregister YYSTYPE *yyvsp;\n\
register YYLTYPE *yylsp;\n\
{\n  yyerror = 0;\nyycost = 0;\n  yymsg = 0;\nswitch (n)\n    {"

#define ACTSTR          "\n#include \"%s\"\nextern YYSTYPE yyval;\
\nextern int yychar;\
yyaction(n, yyvsp, yylsp)\nregister int n;\nregister YYSTYPE *yyvsp;\n\
register YYLTYPE *yylsp;\n{\n  switch (n)\n{"

#define ACTSTR_SIMPLE   "\n  switch (yyn) {\n"


void
output_headers (void)
{
  if (semantic_parser)
    fprintf(fguard, GUARDSTR, attrsfile);

  if (noparserflag)
        return;

  fprintf(faction, (semantic_parser ? ACTSTR : ACTSTR_SIMPLE), attrsfile);
/*  if (semantic_parser)        JF moved this below
    fprintf(ftable, "#include \"%s\"\n", attrsfile);
  fprintf(ftable, "#include <stdio.h>\n\n");
*/

  /* Rename certain symbols if -p was specified.  */
  if (spec_name_prefix)
    {
      fprintf(ftable, "#define yyparse %sparse\n", spec_name_prefix);
      fprintf(ftable, "#define yylex %slex\n", spec_name_prefix);
      fprintf(ftable, "#define yyerror %serror\n", spec_name_prefix);
      fprintf(ftable, "#define yylval %slval\n", spec_name_prefix);
      fprintf(ftable, "#define yychar %schar\n", spec_name_prefix);
      fprintf(ftable, "#define yydebug %sdebug\n", spec_name_prefix);
      fprintf(ftable, "#define yynerrs %snerrs\n", spec_name_prefix);
    }
}


void
output_trailers (void)
{
  if (semantic_parser)
      fprintf(fguard, "\n    }\n}\n");

  fprintf(faction, "\n");
  
  if (noparserflag) 
      return;

  if (semantic_parser)
      fprintf(faction, "    }\n");
  fprintf(faction, "}\n");
}


void
output (void)
{
  int c;

  /* output_token_defines(ftable);      / * JF put out token defines FIRST */
  if (!semantic_parser)         /* JF Put out other stuff */
    {
      rewind(fattrs);
      while ((c=getc(fattrs))!=EOF)
        putc(c,ftable);
    }
  reader_output_yylsp(ftable);
  if (debugflag)
    fprintf(ftable, "#ifndef YYDEBUG\n#define YYDEBUG %d\n#endif\n\n",
            !!debugflag);

  if (semantic_parser)
    fprintf(ftable, "#include \"%s\"\n", attrsfile);

  if (! noparserflag)
    fprintf(ftable, "#include <stdio.h>\n\n");

  /* Make "const" do nothing if not in ANSI C.  */
  fprintf (ftable, "#ifndef __cplusplus\n#ifndef __STDC__\n#define const\n#endif\n#endif\n\n");

  free_itemsets();
  output_defines();
  output_token_translations();
/*   if (semantic_parser) */
  /* This is now unconditional because debugging printouts can use it.  */
  output_gram();
  FREE(ritem);
  if (semantic_parser)
    output_stos();
  output_rule_data();
  output_actions();
  if (! noparserflag)
    output_parser();
  output_program();
}


void
output_token_translations (void)
{
  register int i, j;
/*   register short *sp; JF unused */

  if (translations)
    {
      fprintf(ftable,
              "\n#define YYTRANSLATE(x) ((unsigned)(x) <= %d ? yytranslate[x] : %d)\n",
              max_user_token_number, nsyms);
    
      if (ntokens < 127)  /* play it very safe; check maximum element value.  */
        fprintf(ftable, "\nstatic const char yytranslate[] = {     0");
      else
        fprintf(ftable, "\nstatic const short yytranslate[] = {     0");
    
      j = 10;
      for (i = 1; i <= max_user_token_number; i++)
        {
          putc(',', ftable);
    
          if (j >= 10)
            {
              putc('\n', ftable);
              j = 1;
            }
          else
            {
              j++;
            }
    
          fprintf(ftable, "%6d", token_translations[i]);
        }
    
      fprintf(ftable, "\n};\n");
    }
  else
    {
      fprintf(ftable, "\n#define YYTRANSLATE(x) (x)\n");
    } 
}


void
output_gram (void)
{
  register int i;
  register int j;
  register short *sp;

  /* With the ordinary parser, 
     yyprhs and yyrhs are needed only for yydebug. */
  /* With the noparser option, all tables are generated */
  if (! semantic_parser  && ! noparserflag)
    fprintf(ftable, "\n#if YYDEBUG != 0");

  fprintf(ftable, "\nstatic const short yyprhs[] = {     0");

  j = 10;
  for (i = 1; i <= nrules; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", rrhs[i]);
    }

  fprintf(ftable, "\n};\n");

  fprintf(ftable, "\nstatic const short yyrhs[] = {%6d", ritem[0]);

  j = 10;
  for (sp = ritem + 1; *sp; sp++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      if (*sp > 0)
        fprintf(ftable, "%6d", *sp);
      else
        fprintf(ftable, "     0");
    }

  fprintf(ftable, "\n};\n");

  if (! semantic_parser  && ! noparserflag)
    fprintf(ftable, "\n#endif\n");
}


void
output_stos (void)
{
  register int i;
  register int j;

  fprintf(ftable, "\nstatic const short yystos[] = {     0");

  j = 10;
  for (i = 1; i < nstates; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", accessing_symbol[i]);
    }

  fprintf(ftable, "\n};\n");
}


void
output_rule_data (void)
{
  register int i;
  register int j;

  fprintf(ftable, "\n#if YYDEBUG != 0\n");
  fprintf(ftable, "static const short yyrline[] = { 0");

  j = 10;
  for (i = 1; i <= nrules; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", rline[i]);
    }
  fprintf(ftable, "\n};\n#endif\n\n");

  if (toknumflag || noparserflag)
    {
      fprintf(ftable, "#define YYNTOKENS %d\n", ntokens);
      fprintf(ftable, "#define YYNNTS %d\n", nvars);
      fprintf(ftable, "#define YYNRULES %d\n", nrules);
      fprintf(ftable, "#define YYNSTATES %d\n", nstates);
      fprintf(ftable, "#define YYMAXUTOK %d\n\n", max_user_token_number);
    }

  if (! toknumflag  && ! noparserflag)
    fprintf(ftable, "\n#if YYDEBUG != 0 || defined (YYERROR_VERBOSE)\n\n");

  /* Output the table of symbol names.  */

  fprintf(ftable,
          "static const char * const yytname[] = {   \"%s\"",
          tags[0]);

  j = strlen (tags[0]) + 44;
  for (i = 1; i < nsyms; i++)
                /* this used to be i<=nsyms, but that output a final "" symbol
                        almost by accident */
    {
      register char *p;
      putc(',', ftable);
      j++;

      if (j > 75)
        {
          putc('\n', ftable);
          j = 0;
        }

      putc ('\"', ftable);
      j++;

      for (p = tags[i]; p && *p; p++)
        {
          if (*p == '"' || *p == '\\')
            {
              fprintf(ftable, "\\%c", *p);
              j += 2;
            }
          else if (*p == '\n')
            {
              fprintf(ftable, "\\n");
              j += 2;
            }
          else if (*p == '\t')
            {
              fprintf(ftable, "\\t");
              j += 2;
            }
          else if (*p == '\b')
            {
              fprintf(ftable, "\\b");
              j += 2;
            }
          else if (*p < 040 || *p >= 0177)
            {
              fprintf(ftable, "\\%03o", *p);
              j += 4;
            }
          else
            {
              putc(*p, ftable);
              j++;
            }
        }

      putc ('\"', ftable);
      j++;
    }
    fprintf(ftable, ", NULL\n};\n");    /* add a NULL entry to list of tokens */

  if (! toknumflag  && ! noparserflag)
    fprintf(ftable, "#endif\n\n");

  if (toknumflag) 
    {
      fprintf(ftable, "static const short yytoknum[] = { 0");
      j = 10;
      for (i = 1; i <= ntokens; i++) {
          putc(',', ftable);
          if (j >= 10) 
            {
              putc('\n', ftable);
              j = 1;
            }
          else
            j++;
          fprintf(ftable, "%6d", user_toknums[i]);
      }
      fprintf(ftable, "\n};\n\n");
    }

  fprintf(ftable, "static const short yyr1[] = {     0");

  j = 10;
  for (i = 1; i <= nrules; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", rlhs[i]);
    }

  FREE(rlhs + 1);

  fprintf(ftable, "\n};\n\nstatic const short yyr2[] = {     0");

  j = 10;
  for (i = 1; i < nrules; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", rrhs[i + 1] - rrhs[i] - 1);
    }

  putc(',', ftable);
  if (j >= 10)
    putc('\n', ftable);

  fprintf(ftable, "%6d\n};\n", nitems - rrhs[nrules] - 1);
  FREE(rrhs + 1);
}


void
output_defines (void)
{
  fprintf(ftable, "\n\n#define\tYYFINAL\t\t%d\n", final_state);
  fprintf(ftable, "#define\tYYFLAG\t\t%d\n", MINSHORT);
  fprintf(ftable, "#define\tYYNTBASE\t%d\n", ntokens);
}



/* compute and output yydefact, yydefgoto, yypact, yypgoto, yytable and yycheck.  */

void
output_actions (void)
{
  nvectors = nstates + nvars;

  froms = NEW2(nvectors, short *);
  tos = NEW2(nvectors, short *);
  tally = NEW2(nvectors, short);
  width = NEW2(nvectors, short);

  token_actions();
  free_shifts();
  free_reductions();
  FREE(lookaheads);
  FREE(LA);
  FREE(LAruleno);
  FREE(accessing_symbol);

  goto_actions();
  FREE(goto_map + ntokens);
  FREE(from_state);
  FREE(to_state);

  sort_actions();
  pack_table();
  output_base();
  output_table();
  output_check();
}



/* figure out the actions for the specified state, indexed by lookahead token type.

   The yydefact table is output now.  The detailed info
   is saved for putting into yytable later.  */

void
token_actions (void)
{
  register int i;
  register int j;
  register int k;

  actrow = NEW2(ntokens, short);

  k = action_row(0);
  fprintf(ftable, "\nstatic const short yydefact[] = {%6d", k);
  save_row(0);

  j = 10;
  for (i = 1; i < nstates; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      k = action_row(i);
      fprintf(ftable, "%6d", k);
      save_row(i);
    }

  fprintf(ftable, "\n};\n");
  FREE(actrow);
}



/* Decide what to do for each type of token if seen as the lookahead token in specified state.
   The value returned is used as the default action (yydefact) for the state.
   In addition, actrow is filled with what to do for each kind of token,
   index by symbol number, with zero meaning do the default action.
   The value MINSHORT, a very negative number, means this situation
   is an error.  The parser recognizes this value specially.

   This is where conflicts are resolved.  The loop over lookahead rules
   considered lower-numbered rules last, and the last rule considered that likes
   a token gets to handle it.  */

int
action_row (int state)
{
  register int i;
  register int j;
  register int k;
  register int m;
  register int n;
  register int count;
  register int default_rule;
  register int nreds;
  register int max;
  register int rule;
  register int shift_state;
  register int symbol;
  register unsigned mask;
  register unsigned *wordp;
  register reductions *redp;
  register shifts *shiftp;
  register errs *errp;
  int nodefault = 0;  /* set nonzero to inhibit having any default reduction */

  for (i = 0; i < ntokens; i++)
    actrow[i] = 0;

  default_rule = 0;
  nreds = 0;
  redp = reduction_table[state];

  if (redp)
    {
      nreds = redp->nreds;

      if (nreds >= 1)
        {
          /* loop over all the rules available here which require lookahead */
          m = lookaheads[state];
          n = lookaheads[state + 1];

          for (i = n - 1; i >= m; i--)
            {
              rule = - LAruleno[i];
              wordp = LA + i * tokensetsize;
              mask = 1;

              /* and find each token which the rule finds acceptable to come next */
              for (j = 0; j < ntokens; j++)
                {
                  /* and record this rule as the rule to use if that token follows.  */
                  if (mask & *wordp)
                    actrow[j] = rule;

                  mask <<= 1;
                  if (mask == 0)
                    {
                      mask = 1;
                      wordp++;
                    }
                }
            }
        }
    }

  shiftp = shift_table[state];

  /* now see which tokens are allowed for shifts in this state.
     For them, record the shift as the thing to do.  So shift is preferred to reduce.  */

  if (shiftp)
    {
      k = shiftp->nshifts;

      for (i = 0; i < k; i++)
        {
          shift_state = shiftp->shifts[i];
          if (! shift_state) continue;

          symbol = accessing_symbol[shift_state];

          if (ISVAR(symbol))
            break;

          actrow[symbol] = shift_state;

          /* do not use any default reduction if there is a shift for error */

          if (symbol == error_token_number) nodefault = 1;
        }
    }

  errp = err_table[state];

  /* See which tokens are an explicit error in this state
     (due to %nonassoc).  For them, record MINSHORT as the action.  */

  if (errp)
    {
      k = errp->nerrs;

      for (i = 0; i < k; i++)
        {
          symbol = errp->errs[i];
          actrow[symbol] = MINSHORT;
        }
    }

  /* now find the most common reduction and make it the default action for this state.  */

  if (nreds >= 1 && ! nodefault)
    {
      if (consistent[state])
        default_rule = redp->rules[0];
      else
        {
          max = 0;
          for (i = m; i < n; i++)
            {
              count = 0;
              rule = - LAruleno[i];
    
              for (j = 0; j < ntokens; j++)
                {
                  if (actrow[j] == rule)
                    count++;
                }
    
              if (count > max)
                {
                  max = count;
                  default_rule = rule;
                }
            }
    
          /* actions which match the default are replaced with zero,
             which means "use the default" */
    
          if (max > 0)
            {
              for (j = 0; j < ntokens; j++)
                {
                  if (actrow[j] == default_rule)
                    actrow[j] = 0;
                }
    
              default_rule = - default_rule;
            }
        }
    }

  /* If have no default rule, the default is an error.
     So replace any action which says "error" with "use default".  */

  if (default_rule == 0)
    for (j = 0; j < ntokens; j++)
      {
        if (actrow[j] == MINSHORT)
          actrow[j] = 0;
      }

  return (default_rule);
}


void
save_row (int state)
{
  register int i;
  register int count;
  register short *sp;
  register short *sp1;
  register short *sp2;

  count = 0;
  for (i = 0; i < ntokens; i++)
    {
      if (actrow[i] != 0)
        count++;
    }

  if (count == 0)
    return;

  froms[state] = sp1 = sp = NEW2(count, short);
  tos[state] = sp2 = NEW2(count, short);

  for (i = 0; i < ntokens; i++)
    {
      if (actrow[i] != 0)
        {
          *sp1++ = i;
          *sp2++ = actrow[i];
        }
    }

  tally[state] = count;
  width[state] = sp1[-1] - sp[0] + 1;
}



/* figure out what to do after reducing with each rule,
   depending on the saved state from before the beginning
   of parsing the data that matched this rule.

   The yydefgoto table is output now.  The detailed info
   is saved for putting into yytable later.  */

void
goto_actions (void)
{
  register int i;
  register int j;
  register int k;

  state_count = NEW2(nstates, short);

  k = default_goto(ntokens);
  fprintf(ftable, "\nstatic const short yydefgoto[] = {%6d", k);
  save_column(ntokens, k);

  j = 10;
  for (i = ntokens + 1; i < nsyms; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      k = default_goto(i);
      fprintf(ftable, "%6d", k);
      save_column(i, k);
    }

  fprintf(ftable, "\n};\n");
  FREE(state_count);
}



int
default_goto (int symbol)
{
  register int i;
  register int m;
  register int n;
  register int default_state;
  register int max;

  m = goto_map[symbol];
  n = goto_map[symbol + 1];

  if (m == n)
    return (-1);

  for (i = 0; i < nstates; i++)
    state_count[i] = 0;

  for (i = m; i < n; i++)
    state_count[to_state[i]]++;

  max = 0;
  default_state = -1;

  for (i = 0; i < nstates; i++)
    {
      if (state_count[i] > max)
        {
          max = state_count[i];
          default_state = i;
        }
    }

  return (default_state);
}


void
save_column (int symbol, int default_state)
{
  register int i;
  register int m;
  register int n;
  register short *sp;
  register short *sp1;
  register short *sp2;
  register int count;
  register int symno;

  m = goto_map[symbol];
  n = goto_map[symbol + 1];

  count = 0;
  for (i = m; i < n; i++)
    {
      if (to_state[i] != default_state)
        count++;
    }

  if (count == 0)
    return;

  symno = symbol - ntokens + nstates;

  froms[symno] = sp1 = sp = NEW2(count, short);
  tos[symno] = sp2 = NEW2(count, short);

  for (i = m; i < n; i++)
    {
      if (to_state[i] != default_state)
        {
          *sp1++ = from_state[i];
          *sp2++ = to_state[i];
        }
    }

  tally[symno] = count;
  width[symno] = sp1[-1] - sp[0] + 1;
}



/* the next few functions decide how to pack 
   the actions and gotos information into yytable. */

void
sort_actions (void)
{
  register int i;
  register int j;
  register int k;
  register int t;
  register int w;

  order = NEW2(nvectors, short);
  nentries = 0;

  for (i = 0; i < nvectors; i++)
    {
      if (tally[i] > 0)
        {
          t = tally[i];
          w = width[i];
          j = nentries - 1;

          while (j >= 0 && (width[order[j]] < w))
            j--;

          while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t))
            j--;

          for (k = nentries - 1; k > j; k--)
            order[k + 1] = order[k];

          order[j + 1] = i;
          nentries++;
        }
    }
}


void
pack_table (void)
{
  register int i;
  register int place;
  register int state;

  base = NEW2(nvectors, short);
  pos = NEW2(nentries, short);
  table = NEW2(MAXTABLE, short);
  check = NEW2(MAXTABLE, short);

  lowzero = 0;
  high = 0;

  for (i = 0; i < nvectors; i++)
    base[i] = MINSHORT;

  for (i = 0; i < MAXTABLE; i++)
    check[i] = -1;

  for (i = 0; i < nentries; i++)
    {
      state = matching_state(i);

      if (state < 0)
        place = pack_vector(i);
      else
        place = base[state];

      pos[i] = place;
      base[order[i]] = place;
    }

  for (i = 0; i < nvectors; i++)
    {
      if (froms[i])
        FREE(froms[i]);
      if (tos[i])
        FREE(tos[i]);
    }

  FREE(froms);
  FREE(tos);
  FREE(pos);
}



int
matching_state (int vector)
{
  register int i;
  register int j;
  register int k;
  register int t;
  register int w;
  register int match;
  register int prev;

  i = order[vector];
  if (i >= nstates)
    return (-1);

  t = tally[i];
  w = width[i];

  for (prev = vector - 1; prev >= 0; prev--)
    {
      j = order[prev];
      if (width[j] != w || tally[j] != t)
        return (-1);

      match = 1;
      for (k = 0; match && k < t; k++)
        {
          if (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k])
            match = 0;
        }

      if (match)
        return (j);
    }

  return (-1);
}



int
pack_vector (int vector)
{
  register int i;
  register int j;
  register int k;
  register int t;
  register int loc;
  register int ok;
  register short *from;
  register short *to;

  i = order[vector];
  t = tally[i];

  if (t == 0)
    berror("pack_vector");

  from = froms[i];
  to = tos[i];

  for (j = lowzero - from[0]; j < MAXTABLE; j++)
    {
      ok = 1;

      for (k = 0; ok && k < t; k++)
        {
          loc = j + from[k];
          if (loc > MAXTABLE)
            fatals(_("maximum table size (%s) exceeded"), int_to_string(MAXTABLE));

          if (table[loc] != 0)
            ok = 0;
        }

      for (k = 0; ok && k < vector; k++)
        {
          if (pos[k] == j)
            ok = 0;
        }

      if (ok)
        {
          for (k = 0; k < t; k++)
            {
              loc = j + from[k];
              table[loc] = to[k];
              check[loc] = from[k];
            }

          while (table[lowzero] != 0)
            lowzero++;

          if (loc > high)
            high = loc;

          return (j);
        }
    }

  berror("pack_vector");
  return 0;     /* JF keep lint happy */
}



/* the following functions output yytable, yycheck
   and the vectors whose elements index the portion starts */

void
output_base (void)
{
  register int i;
  register int j;

  fprintf(ftable, "\nstatic const short yypact[] = {%6d", base[0]);

  j = 10;
  for (i = 1; i < nstates; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", base[i]);
    }

  fprintf(ftable, "\n};\n\nstatic const short yypgoto[] = {%6d", base[nstates]);

  j = 10;
  for (i = nstates + 1; i < nvectors; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", base[i]);
    }

  fprintf(ftable, "\n};\n");
  FREE(base);
}


void
output_table (void)
{
  register int i;
  register int j;

  fprintf(ftable, "\n\n#define\tYYLAST\t\t%d\n\n", high);
  fprintf(ftable, "\nstatic const short yytable[] = {%6d", table[0]);

  j = 10;
  for (i = 1; i <= high; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", table[i]);
    }

  fprintf(ftable, "\n};\n");
  FREE(table);
}


void
output_check (void)
{
  register int i;
  register int j;

  fprintf(ftable, "\nstatic const short yycheck[] = {%6d", check[0]);

  j = 10;
  for (i = 1; i <= high; i++)
    {
      putc(',', ftable);

      if (j >= 10)
        {
          putc('\n', ftable);
          j = 1;
        }
      else
        {
          j++;
        }

      fprintf(ftable, "%6d", check[i]);
    }

  fprintf(ftable, "\n};\n");
  FREE(check);
}



/* copy the parser code into the ftable file at the end.  */

void
output_parser (void)
{
  register int c;
#ifdef DONTDEF
  FILE *fpars;
#else
#define fpars fparser
#endif

  if (pure_parser)
    fprintf(ftable, "#define YYPURE 1\n\n");

#ifdef DONTDEF  /* JF no longer needed 'cuz open_extra_files changes the
                   currently open parser from bison.simple to bison.hairy */
  if (semantic_parser)
    fpars = fparser;
  else fpars = fparser1;
#endif

  /* Loop over lines in the standard parser file.  */

  while (1)
    {
      int write_line = 1;

      c = getc(fpars);

      /* See if the line starts with `#line.
         If so, set write_line to 0.  */
      if (nolinesflag)
        if (c == '#') 
          {
            c = getc(fpars);
            if (c == 'l')
              {
                c = getc(fpars);
                if (c == 'i')
                  {
                    c = getc(fpars);
                    if (c == 'n')
                      {
                        c = getc(fpars);
                        if (c == 'e')
                          write_line = 0;
                        else
                          fprintf(ftable, "#lin");
                      }
                    else
                      fprintf(ftable, "#li");
                  }
                else
                  fprintf(ftable, "#l");
              }
            else
              fprintf(ftable, "#");
          }

      /* now write out the line... */
      for (; c != '\n' && c != EOF; c = getc(fpars))
        if (write_line) {
          if (c == '$')
            {
              /* `$' in the parser file indicates where to put the actions.
                 Copy them in at this point.  */
              rewind(faction);
              for(c=getc(faction);c!=EOF;c=getc(faction))
                putc(c,ftable);
            }
          else
            putc(c, ftable);
        }
      if (c == EOF)
        break;
      putc(c, ftable);
    }
}

void
output_program (void)
{
  register int c;

  if (!nolinesflag)
    fprintf(ftable, "#line %d \"%s\"\n", lineno, infile);

  c = getc(finput);
  while (c != EOF)
    {
      putc(c, ftable);
      c = getc(finput);
    }
}


void
free_itemsets (void)
{
  register core *cp,*cptmp;

  FREE(state_table);

  for (cp = first_state; cp; cp = cptmp) {
    cptmp=cp->next;
    FREE(cp);
  }
}


void
free_shifts (void)
{
  register shifts *sp,*sptmp;/* JF derefrenced freed ptr */

  FREE(shift_table);

  for (sp = first_shift; sp; sp = sptmp) {
    sptmp=sp->next;
    FREE(sp);
  }
}


void
free_reductions (void)
{
  register reductions *rp,*rptmp;/* JF fixed freed ptr */

  FREE(reduction_table);

  for (rp = first_reduction; rp; rp = rptmp) {
    rptmp=rp->next;
    FREE(rp);
  }
}