src/symlist.c

   1 /* Lists of symbols for Bison
   2    Copyright (C) 2002  Free Software Foundation, Inc.
   3
   4    This file is part of Bison, the GNU Compiler Compiler.
   5
   6    Bison is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    Bison is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with Bison; see the file COPYING.  If not, write to
  18    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "system.h"
  22 #include "symlist.h"
  23
  24
  25 /*----------------------------------------------.
  26 | Create a list containing SYMBOL at LOCATION.  |
  27 `----------------------------------------------*/
  28
  29 symbol_list_t *
  30 symbol_list_new (symbol_t *sym, location_t location)
  31 {
  32   symbol_list_t *res = XMALLOC (symbol_list_t, 1);
  33   res->next = NULL;
  34   res->sym = sym;
  35   res->location = location;
  36   res->action = NULL;
  37   res->ruleprec = NULL;
  38   return res;
  39 }
  40
  41
  42 /*-----------------------------------------.
  43 | Prepend SYMBOL at LOCATION to the LIST.  |
  44 `-----------------------------------------*/
  45
  46 symbol_list_t *
  47 symbol_list_prepend (symbol_list_t *list,
  48                      symbol_t *symbol, location_t location)
  49 {
  50   symbol_list_t *res = symbol_list_new (symbol, location);
  51   res->next = list;
  52   return res;
  53 }
  54
  55
  56 /*-------------------------------------------------.
  57 | Free the LIST, but not the symbols it contains.  |
  58 `-------------------------------------------------*/
  59
  60 void
  61 symbol_list_free (symbol_list_t *list)
  62 {
  63   LIST_FREE (symbol_list_t, list);
  64 }
  65
  66
  67 /*--------------------.
  68 | Return its length.  |
  69 `--------------------*/
  70
  71 unsigned int
  72 symbol_list_length (symbol_list_t *list)
  73 {
  74   int res = 0;
  75   for (/* Nothing. */; list; list = list->next)
  76     ++res;
  77   return res;
  78 }
  79
  80
  81 /*--------------------------------------------------------------.
  82 | Get the data type (alternative in the union) of the value for |
  83 | symbol N in rule RULE.                                        |
  84 `--------------------------------------------------------------*/
  85
  86 char *
  87 symbol_list_n_type_name_get (symbol_list_t *rule, location_t location, int n)
  88 {
  89   int i;
  90   symbol_list_t *rp;
  91
  92   if (n < 0)
  93     {
  94       complain_at (location, _("invalid $ value"));
  95       return NULL;
  96     }
  97
  98   rp = rule;
  99   i = 0;
 100
 101   while (i < n)
 102     {
 103       rp = rp->next;
 104       if (rp == NULL || rp->sym == NULL)
 105         {
 106           complain_at (location, _("invalid $ value"));
 107           return NULL;
 108         }
 109       ++i;
 110     }
 111
 112   return rp->sym->type_name;
 113 }