src/symlist.c

   1 /* Lists of symbols for Bison
   2
   3    Copyright (C) 2002, 2005 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, 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 | Print this list.  |
  49 `------------------*/
  50
  51 void
  52 symbol_list_print (FILE *f, symbol_list *l)
  53 {
  54   for (/* Nothing. */; l; l = l->next)
  55     symbol_print (f, l->sym);
  56 }
  57
  58
  59 /*---------------------------------.
  60 | Prepend SYM at LOC to the LIST.  |
  61 `---------------------------------*/
  62
  63 symbol_list *
  64 symbol_list_prepend (symbol_list *list, symbol *sym, location loc)
  65 {
  66   symbol_list *res = symbol_list_new (sym, loc);
  67   res->next = list;
  68   return res;
  69 }
  70
  71
  72 /*-------------------------------------------------.
  73 | Free the LIST, but not the symbols it contains.  |
  74 `-------------------------------------------------*/
  75
  76 void
  77 symbol_list_free (symbol_list *list)
  78 {
  79   LIST_FREE (symbol_list, list);
  80 }
  81
  82
  83 /*--------------------.
  84 | Return its length.  |
  85 `--------------------*/
  86
  87 unsigned int
  88 symbol_list_length (symbol_list *list)
  89 {
  90   int res = 0;
  91   for (/* Nothing. */; list; list = list->next)
  92     ++res;
  93   return res;
  94 }
  95
  96
  97 /*--------------------------------------------------------------.
  98 | Get the data type (alternative in the union) of the value for |
  99 | symbol N in symbol list RP.                                   |
 100 `--------------------------------------------------------------*/
 101
 102 uniqstr
 103 symbol_list_n_type_name_get (symbol_list *rp, location loc, int n)
 104 {
 105   int i;
 106
 107   if (n < 0)
 108     {
 109       complain_at (loc, _("invalid $ value: $%d"), n);
 110       return NULL;
 111     }
 112
 113   i = 0;
 114
 115   while (i < n)
 116     {
 117       rp = rp->next;
 118       if (rp == NULL || rp->sym == NULL)
 119         {
 120           complain_at (loc, _("invalid $ value: $%d"), n);
 121           return NULL;
 122         }
 123       ++i;
 124     }
 125
 126   return rp->sym->type_name;
 127 }