src/InadequacyList.c

   1 /* IELR's inadequacy list.
   2
   3    Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21 #include "system.h"
  22
  23 #include "InadequacyList.h"
  24
  25 ContributionIndex const ContributionIndex__none = -1;
  26 ContributionIndex const ContributionIndex__error_action = -2;
  27
  28 InadequacyList *
  29 InadequacyList__new_conflict (state *manifesting_state, symbol *token,
  30                               bitset actions,
  31                               InadequacyListNodeCount *node_count)
  32 {
  33   InadequacyList *result = xmalloc (sizeof *result);
  34   result->id = (*node_count)++;
  35   aver (*node_count != 0);
  36   result->next = NULL;
  37   result->manifestingState = manifesting_state;
  38   result->contributionCount = bitset_count (actions);
  39   result->inadequacy.conflict.token = token;
  40   result->inadequacy.conflict.actions = actions;
  41   return result;
  42 }
  43
  44 void
  45 InadequacyList__delete (InadequacyList *self)
  46 {
  47   while (self)
  48     {
  49       InadequacyList *node = self;
  50       self = self->next;
  51       bitset_free (node->inadequacy.conflict.actions);
  52       free (node);
  53     }
  54 }
  55
  56 ContributionIndex
  57 InadequacyList__getShiftContributionIndex (InadequacyList const *self)
  58 {
  59   if (!bitset_test (self->inadequacy.conflict.actions,
  60                     self->manifestingState->reductions->num))
  61     return ContributionIndex__none;
  62   return self->contributionCount - 1;
  63 }
  64
  65 symbol *
  66 InadequacyList__getContributionToken (InadequacyList const *self,
  67                                       ContributionIndex i)
  68 {
  69   aver (0 <= i && i < self->contributionCount);
  70   return self->inadequacy.conflict.token;
  71 }
  72
  73 void
  74 InadequacyList__prependTo (InadequacyList *self, InadequacyList **list)
  75 {
  76   InadequacyList *head_old = *list;
  77   *list = self;
  78   self->next = head_old;
  79 }