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 "complain.h"
  23 #include "symlist.h"
  24
  25
  26 /*----------------------------------------------.
  27 | Create a list containing SYMBOL at LOCATION.  |
  28 `----------------------------------------------*/
  29
  30 symbol_list_t *
  31 symbol_list_new (symbol_t *sym, location_t location)
  32 {
  33   symbol_list_t *res = XMALLOC (symbol_list_t, 1);
  34   res->next = NULL;
  35   res->sym = sym;
  36   res->location = location;
  37   res->action = NULL;
  38   res->ruleprec = NULL;
  39   return res;
  40 }
  41
  42
  43 /*-----------------------------------------.
  44 | Prepend SYMBOL at LOCATION to the LIST.  |
  45 `-----------------------------------------*/
  46
  47 symbol_list_t *
  48 symbol_list_prepend (symbol_list_t *list,
  49                      symbol_t *symbol, location_t location)
  50 {
  51   symbol_list_t *res = symbol_list_new (symbol, location);
  52   res->next = list;
  53   return res;
  54 }
  55
  56
  57 /*-------------------------------------------------.
  58 | Free the LIST, but not the symbols it contains.  |
  59 `-------------------------------------------------*/
  60
  61 void
  62 symbol_list_free (symbol_list_t *list)
  63 {
  64   LIST_FREE (symbol_list_t, list);
  65 }
  66
  67
  68 /*--------------------.
  69 | Return its length.  |
  70 `--------------------*/
  71
  72 unsigned int
  73 symbol_list_length (symbol_list_t *list)
  74 {
  75   int res = 0;
  76   for (/* Nothing. */; list; list = list->next)
  77     ++res;
  78   return res;
  79 }
  80
  81
  82 /*--------------------------------------------------------------.
  83 | Get the data type (alternative in the union) of the value for |
  84 | symbol N in rule RULE.                                        |
  85 `--------------------------------------------------------------*/
  86
  87 char *
  88 symbol_list_n_type_name_get (symbol_list_t *rule, location_t location, int n)
  89 {
  90   int i;
  91   symbol_list_t *rp;
  92
  93   if (n < 0)
  94     {
  95       complain_at (location, _("invalid $ value"));
  96       return NULL;
  97     }
  98
  99   rp = rule;
 100   i = 0;
 101
 102   while (i < n)
 103     {
 104       rp = rp->next;
 105       if (rp == NULL || rp->sym == NULL)
 106         {
 107           complain_at (location, _("invalid $ value"));
 108           return NULL;
 109         }
 110       ++i;
 111     }
 112
 113   return rp->sym->type_name;
 114 }