src/symlist.c

   1 /* Lists of symbols for Bison
   2
   3    Copyright (C) 2002 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    Bison 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 2, or (at your option)
  10    any later version.
  11
  12    Bison 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 Bison; see the file COPYING.  If not, write to
  19    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "system.h"
  23
  24 #include "complain.h"
  25 #include "symlist.h"
  26
  27
  28 /*--------------------------------------.
  29 | Create a list containing SYM at LOC.  |
  30 `--------------------------------------*/
  31
  32 symbol_list *
  33 symbol_list_new (symbol *sym, location loc)
  34 {
  35   symbol_list *res = xmalloc (sizeof *res);
  36   res->next = NULL;
  37   res->sym = sym;
  38   res->location = loc;
  39   res->action = NULL;
  40   res->ruleprec = NULL;
  41   res->dprec = 0;
  42   res->merger = 0;
  43   return res;
  44 }
  45
  46
  47 /*---------------------------------.
  48 | Prepend SYM at LOC to the LIST.  |
  49 `---------------------------------*/
  50
  51 symbol_list *
  52 symbol_list_prepend (symbol_list *list, symbol *sym, location loc)
  53 {
  54   symbol_list *res = symbol_list_new (sym, loc);
  55   res->next = list;
  56   return res;
  57 }
  58
  59
  60 /*-------------------------------------------------.
  61 | Free the LIST, but not the symbols it contains.  |
  62 `-------------------------------------------------*/
  63
  64 void
  65 symbol_list_free (symbol_list *list)
  66 {
  67   LIST_FREE (symbol_list, list);
  68 }
  69
  70
  71 /*--------------------.
  72 | Return its length.  |
  73 `--------------------*/
  74
  75 unsigned int
  76 symbol_list_length (symbol_list *list)
  77 {
  78   int res = 0;
  79   for (/* Nothing. */; list; list = list->next)
  80     ++res;
  81   return res;
  82 }
  83
  84
  85 /*--------------------------------------------------------------.
  86 | Get the data type (alternative in the union) of the value for |
  87 | symbol N in symbol list RP.                                   |
  88 `--------------------------------------------------------------*/
  89
  90 uniqstr
  91 symbol_list_n_type_name_get (symbol_list *rp, location loc, int n)
  92 {
  93   int i;
  94
  95   if (n < 0)
  96     {
  97       complain_at (loc, _("invalid $ value"));
  98       return NULL;
  99     }
 100
 101   i = 0;
 102
 103   while (i < n)
 104     {
 105       rp = rp->next;
 106       if (rp == NULL || rp->sym == NULL)
 107         {
 108           complain_at (loc, _("invalid $ value"));
 109           return NULL;
 110         }
 111       ++i;
 112     }
 113
 114   return rp->sym->type_name;
 115 }