Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/src/tables.c

+/* Output the generated parsing program for Bison.
+
+   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006 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 <bitsetv.h>
+#include <quotearg.h>
+
+#include "complain.h"
+#include "conflicts.h"
+#include "files.h"
+#include "getargs.h"
+#include "gram.h"
+#include "lalr.h"
+#include "reader.h"
+#include "symtab.h"
+#include "tables.h"
+
+/* Several tables are indexed both by state and nonterminal numbers.
+   We call such an index a `vector'; i.e., a vector is either a state
+   or a nonterminal number.
+
+   Of course vector_number_t ought to be wide enough to contain
+   state_number and symbol_number.  */
+typedef int vector_number;
+
+#if 0 /* Not currently used.  */
+static inline vector_number
+state_number_to_vector_number (state_number s)
+{
+  return s;
+}
+#endif
+
+static inline vector_number
+symbol_number_to_vector_number (symbol_number sym)
+{
+  return state_number_as_int (nstates) + sym - ntokens;
+}
+
+int nvectors;
+
+
+/* FROMS and TOS are indexed by vector_number.
+
+   If VECTOR is a nonterminal, (FROMS[VECTOR], TOS[VECTOR]) form an
+   array of state numbers of the non defaulted GOTO on VECTOR.
+
+   If VECTOR is a state, TOS[VECTOR] is the array of actions to do on
+   the (array of) symbols FROMS[VECTOR].
+
+   In both cases, TALLY[VECTOR] is the size of the arrays
+   FROMS[VECTOR], TOS[VECTOR]; and WIDTH[VECTOR] =
+   (FROMS[VECTOR][SIZE] - FROMS[VECTOR][0] + 1) where SIZE =
+   TALLY[VECTOR].
+
+   FROMS therefore contains symbol_number and action_number,
+   TOS state_number and action_number,
+   TALLY sizes,
+   WIDTH differences of FROMS.
+
+   Let base_number be the type of FROMS, TOS, and WIDTH.  */
+#define BASE_MAXIMUM INT_MAX
+#define BASE_MINIMUM INT_MIN
+
+static base_number **froms;
+static base_number **tos;
+static unsigned int **conflict_tos;
+static int *tally;
+static base_number *width;
+
+
+/* For a given state, N = ACTROW[SYMBOL]:
+
+   If N = 0, stands for `run the default action'.
+   If N = MIN, stands for `raise a syntax error'.
+   If N > 0, stands for `shift SYMBOL and go to n'.
+   If N < 0, stands for `reduce -N'.  */
+typedef int action_number;
+#define ACTION_NUMBER_MINIMUM INT_MIN
+
+static action_number *actrow;
+
+/* FROMS and TOS are reordered to be compressed.  ORDER[VECTOR] is the
+   new vector number of VECTOR.  We skip `empty' vectors (i.e.,
+   TALLY[VECTOR] = 0), and call these `entries'.  */
+static vector_number *order;
+static int nentries;
+
+base_number *base = NULL;
+/* A distinguished value of BASE, negative infinite.  During the
+   computation equals to BASE_MINIMUM, later mapped to BASE_NINF to
+   keep parser tables small.  */
+base_number base_ninf = 0;
+static base_number *pos = NULL;
+
+static unsigned int *conflrow;
+unsigned int *conflict_table;
+unsigned int *conflict_list;
+int conflict_list_cnt;
+static int conflict_list_free;
+
+/* TABLE_SIZE is the allocated size of both TABLE and CHECK.  We start
+   with more or less the original hard-coded value (which was
+   SHRT_MAX).  */
+static int table_size = 32768;
+base_number *table;
+base_number *check;
+/* The value used in TABLE to denote explicit syntax errors
+   (%nonassoc), a negative infinite.  First defaults to ACTION_NUMBER_MININUM,
+   but in order to keep small tables, renumbered as TABLE_ERROR, which
+   is the smallest (non error) value minus 1.  */
+base_number table_ninf = 0;
+static int lowzero;
+int high;
+
+state_number *yydefgoto;
+rule_number *yydefact;
+
+/*----------------------------------------------------------------.
+| If TABLE (and CHECK) appear to be small to be addressed at      |
+| DESIRED, grow them.  Note that TABLE[DESIRED] is to be used, so |
+| the desired size is at least DESIRED + 1.                       |
+`----------------------------------------------------------------*/
+
+static void
+table_grow (int desired)
+{
+  int old_size = table_size;
+
+  while (table_size <= desired)
+    table_size *= 2;
+
+  if (trace_flag & trace_resource)
+    fprintf (stderr, "growing table and check from: %d to %d\n",
+             old_size, table_size);
+
+  table = xnrealloc (table, table_size, sizeof *table);
+  conflict_table = xnrealloc (conflict_table, table_size,
+                              sizeof *conflict_table);
+  check = xnrealloc (check, table_size, sizeof *check);
+
+  for (/* Nothing. */; old_size < table_size; ++old_size)
+    {
+      table[old_size] = 0;
+      conflict_table[old_size] = 0;
+      check[old_size] = -1;
+    }
+}
+
+
+
+
+/*-------------------------------------------------------------------.
+| For GLR parsers, for each conflicted token in S, as indicated      |
+| by non-zero entries in CONFLROW, create a list of possible         |
+| reductions that are alternatives to the shift or reduction         |
+| currently recorded for that token in S.  Store the alternative     |
+| reductions followed by a 0 in CONFLICT_LIST, updating              |
+| CONFLICT_LIST_CNT, and storing an index to the start of the list   |
+| back into CONFLROW.                                                |
+`-------------------------------------------------------------------*/
+
+static void
+conflict_row (state *s)
+{
+  int i, j;
+  reductions *reds = s->reductions;
+
+  if (!nondeterministic_parser)
+    return;
+
+  for (j = 0; j < ntokens; j += 1)
+    if (conflrow[j])
+      {
+        conflrow[j] = conflict_list_cnt;
+
+        /* Find all reductions for token J, and record all that do not
+           match ACTROW[J].  */
+        for (i = 0; i < reds->num; i += 1)
+          if (bitset_test (reds->lookahead_tokens[i], j)
+              && (actrow[j]
+                  != rule_number_as_item_number (reds->rules[i]->number)))
+            {
+              aver (0 < conflict_list_free);
+              conflict_list[conflict_list_cnt] = reds->rules[i]->number + 1;
+              conflict_list_cnt += 1;
+              conflict_list_free -= 1;
+            }
+
+        /* Leave a 0 at the end.  */
+        aver (0 < conflict_list_free);
+        conflict_list[conflict_list_cnt] = 0;
+        conflict_list_cnt += 1;
+        conflict_list_free -= 1;
+      }
+}
+
+
+/*------------------------------------------------------------------.
+| Decide what to do for each type of token if seen as the           |
+| lookahead 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       |
+| ACTION_NUMBER_MINIMUM, 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.                  |
+|                                                                   |
+| For GLR parsers, also sets CONFLROW[SYM] to an index into         |
+| CONFLICT_LIST iff there is an unresolved conflict (s/r or r/r)    |
+| with symbol SYM. The default reduction is not used for a symbol   |
+| that has any such conflicts.                                      |
+`------------------------------------------------------------------*/
+
+static rule *
+action_row (state *s)
+{
+  int i;
+  rule *default_rule = NULL;
+  reductions *reds = s->reductions;
+  transitions *trans = s->transitions;
+  errs *errp = s->errs;
+  /* Set to nonzero to inhibit having any default reduction.  */
+  bool nodefault = false;
+  bool conflicted = false;
+
+  for (i = 0; i < ntokens; i++)
+    actrow[i] = conflrow[i] = 0;
+
+  if (reds->lookahead_tokens)
+    {
+      int j;
+      bitset_iterator biter;
+      /* loop over all the rules available here which require
+         lookahead (in reverse order to give precedence to the first
+         rule) */
+      for (i = reds->num - 1; i >= 0; --i)
+        /* and find each token which the rule finds acceptable
+           to come next */
+        BITSET_FOR_EACH (biter, reds->lookahead_tokens[i], j, 0)
+        {
+          /* and record this rule as the rule to use if that
+             token follows.  */
+          if (actrow[j] != 0)
+            {
+              conflicted = true;
+              conflrow[j] = 1;
+            }
+          actrow[j] = rule_number_as_item_number (reds->rules[i]->number);
+        }
+    }
+
+  /* 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.  */
+  FOR_EACH_SHIFT (trans, i)
+    {
+      symbol_number sym = TRANSITION_SYMBOL (trans, i);
+      state *shift_state = trans->states[i];
+
+      if (actrow[sym] != 0)
+        {
+          conflicted = true;
+          conflrow[sym] = 1;
+        }
+      actrow[sym] = state_number_as_int (shift_state->number);
+
+      /* Do not use any default reduction if there is a shift for
+         error */
+      if (sym == errtoken->number)
+        nodefault = true;
+    }
+
+  /* See which tokens are an explicit error in this state (due to
+     %nonassoc).  For them, record ACTION_NUMBER_MINIMUM as the
+     action.  */
+  for (i = 0; i < errp->num; i++)
+    {
+      symbol *sym = errp->symbols[i];
+      actrow[sym->number] = ACTION_NUMBER_MINIMUM;
+    }
+
+  /* Now find the most common reduction and make it the default action
+     for this state.  */
+
+  if (reds->num >= 1 && !nodefault)
+    {
+      if (s->consistent)
+        default_rule = reds->rules[0];
+      else
+        {
+          int max = 0;
+          for (i = 0; i < reds->num; i++)
+            {
+              int count = 0;
+              rule *r = reds->rules[i];
+              symbol_number j;
+
+              for (j = 0; j < ntokens; j++)
+                if (actrow[j] == rule_number_as_item_number (r->number))
+                  count++;
+
+              if (count > max)
+                {
+                  max = count;
+                  default_rule = r;
+                }
+            }
+
+          /* GLR parsers need space for conflict lists, so we can't
+             default conflicted entries.  For non-conflicted entries
+             or as long as we are not building a GLR parser,
+             actions that match the default are replaced with zero,
+             which means "use the default". */
+
+          if (max > 0)
+            {
+              int j;
+              for (j = 0; j < ntokens; j++)
+                if (actrow[j] == rule_number_as_item_number (default_rule->number)
+                    && ! (nondeterministic_parser && conflrow[j]))
+                  actrow[j] = 0;
+            }
+        }
+    }
+
+  /* If have no default rule, the default is an error.
+     So replace any action which says "error" with "use default".  */
+
+  if (!default_rule)
+    for (i = 0; i < ntokens; i++)
+      if (actrow[i] == ACTION_NUMBER_MINIMUM)
+        actrow[i] = 0;
+
+  if (conflicted)
+    conflict_row (s);
+
+  return default_rule;
+}
+
+
+/*----------------------------------------.
+| Set FROMS, TOS, TALLY and WIDTH for S.  |
+`----------------------------------------*/
+
+static void
+save_row (state_number s)
+{
+  symbol_number i;
+  int count;
+  base_number *sp;
+  base_number *sp1;
+  base_number *sp2;
+  unsigned int *sp3;
+
+  /* Number of non default actions in S.  */
+  count = 0;
+  for (i = 0; i < ntokens; i++)
+    if (actrow[i] != 0)
+      count++;
+
+  if (count == 0)
+    return;
+
+  /* Allocate non defaulted actions.  */
+  froms[s] = sp = sp1 = xnmalloc (count, sizeof *sp1);
+  tos[s] = sp2 = xnmalloc (count, sizeof *sp2);
+  conflict_tos[s] = sp3 =
+    nondeterministic_parser ? xnmalloc (count, sizeof *sp3) : NULL;
+
+  /* Store non defaulted actions.  */
+  for (i = 0; i < ntokens; i++)
+    if (actrow[i] != 0)
+      {
+        *sp1++ = i;
+        *sp2++ = actrow[i];
+        if (nondeterministic_parser)
+          *sp3++ = conflrow[i];
+      }
+
+  tally[s] = count;
+  width[s] = sp1[-1] - sp[0] + 1;
+}
+
+
+/*------------------------------------------------------------------.
+| 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.                                       |
+`------------------------------------------------------------------*/
+
+static void
+token_actions (void)
+{
+  state_number i;
+  symbol_number j;
+  rule_number r;
+
+  int nconflict = nondeterministic_parser ? conflicts_total_count () : 0;
+
+  yydefact = xnmalloc (nstates, sizeof *yydefact);
+
+  actrow = xnmalloc (ntokens, sizeof *actrow);
+  conflrow = xnmalloc (ntokens, sizeof *conflrow);
+
+  conflict_list = xnmalloc (1 + 2 * nconflict, sizeof *conflict_list);
+  conflict_list_free = 2 * nconflict;
+  conflict_list_cnt = 1;
+
+  /* Find the rules which are reduced.  */
+  if (!nondeterministic_parser)
+    for (r = 0; r < nrules; ++r)
+      rules[r].useful = false;
+
+  for (i = 0; i < nstates; ++i)
+    {
+      rule *default_rule = action_row (states[i]);
+      yydefact[i] = default_rule ? default_rule->number + 1 : 0;
+      save_row (i);
+
+      /* Now that the parser was computed, we can find which rules are
+         really reduced, and which are not because of SR or RR
+         conflicts.  */
+      if (!nondeterministic_parser)
+        {
+          for (j = 0; j < ntokens; ++j)
+            if (actrow[j] < 0 && actrow[j] != ACTION_NUMBER_MINIMUM)
+              rules[item_number_as_rule_number (actrow[j])].useful = true;
+          if (yydefact[i])
+            rules[yydefact[i] - 1].useful = true;
+        }
+    }
+
+  free (actrow);
+  free (conflrow);
+}
+
+
+/*------------------------------------------------------------------.
+| Compute FROMS[VECTOR], TOS[VECTOR], TALLY[VECTOR], WIDTH[VECTOR], |
+| i.e., the information related to non defaulted GOTO on the nterm  |
+| SYM.                                                              |
+|                                                                   |
+| DEFAULT_STATE is the principal destination on SYM, i.e., the      |
+| default GOTO destination on SYM.                                  |
+`------------------------------------------------------------------*/
+
+static void
+save_column (symbol_number sym, state_number default_state)
+{
+  goto_number i;
+  base_number *sp;
+  base_number *sp1;
+  base_number *sp2;
+  int count;
+  vector_number symno = symbol_number_to_vector_number (sym);
+
+  goto_number begin = goto_map[sym - ntokens];
+  goto_number end = goto_map[sym - ntokens + 1];
+
+  /* Number of non default GOTO.  */
+  count = 0;
+  for (i = begin; i < end; i++)
+    if (to_state[i] != default_state)
+      count++;
+
+  if (count == 0)
+    return;
+
+  /* Allocate room for non defaulted gotos.  */
+  froms[symno] = sp = sp1 = xnmalloc (count, sizeof *sp1);
+  tos[symno] = sp2 = xnmalloc (count, sizeof *sp2);
+
+  /* Store the state numbers of the non defaulted gotos.  */
+  for (i = begin; i < end; 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;
+}
+
+
+/*-------------------------------------------------------------.
+| Return `the' most common destination GOTO on SYM (a nterm).  |
+`-------------------------------------------------------------*/
+
+static state_number
+default_goto (symbol_number sym, size_t state_count[])
+{
+  state_number s;
+  goto_number i;
+  goto_number m = goto_map[sym - ntokens];
+  goto_number n = goto_map[sym - ntokens + 1];
+  state_number default_state = -1;
+  size_t max = 0;
+
+  if (m == n)
+    return -1;
+
+  for (s = 0; s < nstates; s++)
+    state_count[s] = 0;
+
+  for (i = m; i < n; i++)
+    state_count[to_state[i]]++;
+
+  for (s = 0; s < nstates; s++)
+    if (state_count[s] > max)
+      {
+        max = state_count[s];
+        default_state = s;
+      }
+
+  return default_state;
+}
+
+
+/*-------------------------------------------------------------------.
+| 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.                                        |
+`-------------------------------------------------------------------*/
+
+static void
+goto_actions (void)
+{
+  symbol_number i;
+  size_t *state_count = xnmalloc (nstates, sizeof *state_count);
+  yydefgoto = xnmalloc (nvars, sizeof *yydefgoto);
+
+  /* For a given nterm I, STATE_COUNT[S] is the number of times there
+     is a GOTO to S on I.  */
+  for (i = ntokens; i < nsyms; ++i)
+    {
+      state_number default_state = default_goto (i, state_count);
+      save_column (i, default_state);
+      yydefgoto[i - ntokens] = default_state;
+    }
+  free (state_count);
+}
+
+
+/*------------------------------------------------------------------.
+| Compute ORDER, a reordering of vectors, in order to decide how to |
+| pack the actions and gotos information into yytable.              |
+`------------------------------------------------------------------*/
+
+static void
+sort_actions (void)
+{
+  int i;
+
+  nentries = 0;
+
+  for (i = 0; i < nvectors; i++)
+    if (tally[i] > 0)
+      {
+        int k;
+        int t = tally[i];
+        int w = width[i];
+        int 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++;
+      }
+}
+
+
+/* If VECTOR is a state which actions (reflected by FROMS, TOS, TALLY
+   and WIDTH of VECTOR) are common to a previous state, return this
+   state number.
+
+   In any other case, return -1.  */
+
+static state_number
+matching_state (vector_number vector)
+{
+  vector_number i = order[vector];
+  int t;
+  int w;
+  int prev;
+
+  /* If VECTOR is a nterm, return -1.  */
+  if (nstates <= i)
+    return -1;
+
+  t = tally[i];
+  w = width[i];
+
+  /* If VECTOR has GLR conflicts, return -1 */
+  if (conflict_tos[i] != NULL)
+    {
+      int j;
+      for (j = 0; j < t; j += 1)
+        if (conflict_tos[i][j] != 0)
+          return -1;
+    }
+
+  for (prev = vector - 1; prev >= 0; prev--)
+    {
+      vector_number j = order[prev];
+      int k;
+      int match = 1;
+
+      /* Given how ORDER was computed, if the WIDTH or TALLY is
+         different, there cannot be a matching state.  */
+      if (width[j] != w || tally[j] != t)
+        return -1;
+
+      for (k = 0; match && k < t; k++)
+        if (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k]
+            || (conflict_tos[j] != NULL && conflict_tos[j][k] != 0))
+          match = 0;
+
+      if (match)
+        return j;
+    }
+
+  return -1;
+}
+
+
+static base_number
+pack_vector (vector_number vector)
+{
+  vector_number i = order[vector];
+  int j;
+  int t = tally[i];
+  int loc = 0;
+  base_number *from = froms[i];
+  base_number *to = tos[i];
+  unsigned int *conflict_to = conflict_tos[i];
+
+  aver (t != 0);
+
+  for (j = lowzero - from[0]; ; j++)
+    {
+      int k;
+      bool ok = true;
+
+      aver (j < table_size);
+
+      for (k = 0; ok && k < t; k++)
+        {
+          loc = j + state_number_as_int (from[k]);
+          if (table_size <= loc)
+            table_grow (loc);
+
+          if (table[loc] != 0)
+            ok = false;
+        }
+
+      for (k = 0; ok && k < vector; k++)
+        if (pos[k] == j)
+          ok = false;
+
+      if (ok)
+        {
+          for (k = 0; k < t; k++)
+            {
+              loc = j + from[k];
+              table[loc] = to[k];
+              if (nondeterministic_parser && conflict_to != NULL)
+                conflict_table[loc] = conflict_to[k];
+              check[loc] = from[k];
+            }
+
+          while (table[lowzero] != 0)
+            lowzero++;
+
+          if (loc > high)
+            high = loc;
+
+          aver (BASE_MINIMUM <= j && j <= BASE_MAXIMUM);
+          return j;
+        }
+    }
+}
+
+
+/*-------------------------------------------------------------.
+| Remap the negative infinite in TAB from NINF to the greatest |
+| possible smallest value.  Return it.                         |
+|                                                              |
+| In most case this allows us to use shorts instead of ints in |
+| parsers.                                                     |
+`-------------------------------------------------------------*/
+
+static base_number
+table_ninf_remap (base_number tab[], int size, base_number ninf)
+{
+  base_number res = 0;
+  int i;
+
+  for (i = 0; i < size; i++)
+    if (tab[i] < res && tab[i] != ninf)
+      res = tab[i];
+
+  --res;
+
+  for (i = 0; i < size; i++)
+    if (tab[i] == ninf)
+      tab[i] = res;
+
+  return res;
+}
+
+static void
+pack_table (void)
+{
+  int i;
+
+  base = xnmalloc (nvectors, sizeof *base);
+  pos = xnmalloc (nentries, sizeof *pos);
+  table = xcalloc (table_size, sizeof *table);
+  conflict_table = xcalloc (table_size, sizeof *conflict_table);
+  check = xnmalloc (table_size, sizeof *check);
+
+  lowzero = 0;
+  high = 0;
+
+  for (i = 0; i < nvectors; i++)
+    base[i] = BASE_MINIMUM;
+
+  for (i = 0; i < table_size; i++)
+    check[i] = -1;
+
+  for (i = 0; i < nentries; i++)
+    {
+      state_number s = matching_state (i);
+      base_number place;
+
+      if (s < 0)
+        /* A new set of state actions, or a nonterminal.  */
+        place = pack_vector (i);
+      else
+        /* Action of I were already coded for S.  */
+        place = base[s];
+
+      pos[i] = place;
+      base[order[i]] = place;
+    }
+
+  /* Use the greatest possible negative infinites.  */
+  base_ninf = table_ninf_remap (base, nvectors, BASE_MINIMUM);
+  table_ninf = table_ninf_remap (table, high + 1, ACTION_NUMBER_MINIMUM);
+
+  free (pos);
+}
+
+
+
+/*-----------------------------------------------------------------.
+| Compute and output yydefact, yydefgoto, yypact, yypgoto, yytable |
+| and yycheck.                                                     |
+`-----------------------------------------------------------------*/
+
+void
+tables_generate (void)
+{
+  int i;
+
+  /* This is a poor way to make sure the sizes are properly
+     correlated.  In particular the signedness is not taken into
+     account.  But it's not useless.  */
+  verify (sizeof nstates <= sizeof nvectors
+          && sizeof nvars <= sizeof nvectors);
+
+  nvectors = state_number_as_int (nstates) + nvars;
+
+  froms = xcalloc (nvectors, sizeof *froms);
+  tos = xcalloc (nvectors, sizeof *tos);
+  conflict_tos = xcalloc (nvectors, sizeof *conflict_tos);
+  tally = xcalloc (nvectors, sizeof *tally);
+  width = xnmalloc (nvectors, sizeof *width);
+
+  token_actions ();
+
+  goto_actions ();
+  free (goto_map);
+  free (from_state);
+  free (to_state);
+
+  order = xcalloc (nvectors, sizeof *order);
+  sort_actions ();
+  pack_table ();
+  free (order);
+
+  free (tally);
+  free (width);
+
+  for (i = 0; i < nvectors; i++)
+    {
+      free (froms[i]);
+      free (tos[i]);
+      free (conflict_tos[i]);
+    }
+
+  free (froms);
+  free (tos);
+  free (conflict_tos);
+}
+
+
+/*-------------------------.
+| Free the parser tables.  |
+`-------------------------*/
+
+void
+tables_free (void)
+{
+  free (base);
+  free (conflict_table);
+  free (conflict_list);
+  free (table);
+  free (check);
+  free (yydefgoto);
+  free (yydefact);
+}