src/InadequacyList.c

   1 /* IELR's inadequacy list.
   2
   3    Copyright (C) 2009 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 {
  32   InadequacyList *result = xmalloc (sizeof *result);
  33   result->next = NULL;
  34   result->manifestingState = manifesting_state;
  35   result->contributionCount = bitset_count (actions);
  36   result->inadequacy.conflict.token = token;
  37   result->inadequacy.conflict.actions = actions;
  38   return result;
  39 }
  40
  41 void
  42 InadequacyList__delete (InadequacyList *self)
  43 {
  44   while (self)
  45     {
  46       InadequacyList *node = self;
  47       self = self->next;
  48       bitset_free (node->inadequacy.conflict.actions);
  49       free (node);
  50     }
  51 }
  52
  53 ContributionIndex
  54 InadequacyList__getShiftContributionIndex (InadequacyList const *self)
  55 {
  56   if (!bitset_test (self->inadequacy.conflict.actions,
  57                     self->manifestingState->reductions->num))
  58     return ContributionIndex__none;
  59   return self->contributionCount - 1;
  60 }
  61
  62 symbol *
  63 InadequacyList__getContributionToken (InadequacyList const *self,
  64                                       ContributionIndex i)
  65 {
  66   aver (0 <= i && i < self->contributionCount);
  67   return self->inadequacy.conflict.token;
  68 }
  69
  70 void
  71 InadequacyList__prependTo (InadequacyList *self, InadequacyList **list)
  72 {
  73   InadequacyList *head_old = *list;
  74   *list = self;
  75   self->next = head_old;
  76 }