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 (symbol_list *l, FILE *f)
  53 {
  54   for (/* Nothing. */; l && l->sym; l = l->next)
  55     {
  56       symbol_print (l->sym, f);
  57       if (l && l->sym)
  58         fputc (' ', f);
  59     }
  60 }
  61
  62
  63 /*---------------------------------.
  64 | Prepend SYM at LOC to the LIST.  |
  65 `---------------------------------*/
  66
  67 symbol_list *
  68 symbol_list_prepend (symbol_list *list, symbol *sym, location loc)
  69 {
  70   symbol_list *res = symbol_list_new (sym, loc);
  71   res->next = list;
  72   return res;
  73 }
  74
  75
  76 /*-------------------------------------------------.
  77 | Free the LIST, but not the symbols it contains.  |
  78 `-------------------------------------------------*/
  79
  80 void
  81 symbol_list_free (symbol_list *list)
  82 {
  83   LIST_FREE (symbol_list, list);
  84 }
  85
  86
  87 /*--------------------.
  88 | Return its length.  |
  89 `--------------------*/
  90
  91 unsigned int
  92 symbol_list_length (symbol_list *list)
  93 {
  94   int res = 0;
  95   for (/* Nothing. */; list; list = list->next)
  96     ++res;
  97   return res;
  98 }
  99
 100
 101 /*--------------------------------------------------------------.
 102 | Get the data type (alternative in the union) of the value for |
 103 | symbol N in symbol list RP.                                   |
 104 `--------------------------------------------------------------*/
 105
 106 uniqstr
 107 symbol_list_n_type_name_get (symbol_list *rp, location loc, int n)
 108 {
 109   int i;
 110
 111   if (n < 0)
 112     {
 113       complain_at (loc, _("invalid $ value: $%d"), n);
 114       return NULL;
 115     }
 116
 117   i = 0;
 118
 119   while (i < n)
 120     {
 121       rp = rp->next;
 122       if (rp == NULL || rp->sym == NULL)
 123         {
 124           complain_at (loc, _("invalid $ value: $%d"), n);
 125           return NULL;
 126         }
 127       ++i;
 128     }
 129
 130   return rp->sym->type_name;
 131 }