src/symlist.c

   1 /* Lists of symbols for Bison
   2
   3    Copyright (C) 2002, 2005, 2006 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 <config.h>
  23 #include "system.h"
  24
  25 #include "complain.h"
  26 #include "symlist.h"
  27
  28
  29 /*--------------------------------------.
  30 | Create a list containing SYM at LOC.  |
  31 `--------------------------------------*/
  32
  33 symbol_list *
  34 symbol_list_sym_new (symbol *sym, location loc)
  35 {
  36   symbol_list *res = xmalloc (sizeof *res);
  37
  38   res->content_type = SYMLIST_SYMBOL;
  39   res->content.sym = sym;
  40   res->location = loc;
  41
  42   res->midrule = NULL;
  43   res->midrule_parent_rule = NULL;
  44   res->midrule_parent_rhs_index = 0;
  45
  46   res->action = NULL;
  47   res->used = false;
  48
  49   res->ruleprec = NULL;
  50   res->dprec = 0;
  51   res->merger = 0;
  52
  53   res->next = NULL;
  54
  55   return res;
  56 }
  57
  58
  59 /*--------------------------------------------.
  60 | Create a list containing TYPE_NAME at LOC.  |
  61 `--------------------------------------------*/
  62
  63 symbol_list *
  64 symbol_list_type_new (uniqstr type_name, location loc)
  65 {
  66   symbol_list *res = xmalloc (sizeof *res);
  67
  68   res->content_type = SYMLIST_TYPE;
  69   res->content.type_name = type_name;
  70   res->location = loc;
  71   res->next = NULL;
  72
  73   return res;
  74 }
  75
  76
  77 /*----------------------------------------------------.
  78 | Create a list containing a %symbol-default at LOC.  |
  79 `----------------------------------------------------*/
  80
  81 symbol_list *
  82 symbol_list_default_new (location loc)
  83 {
  84   symbol_list *res = xmalloc (sizeof *res);
  85
  86   res->content_type = SYMLIST_DEFAULT;
  87   res->location = loc;
  88   res->next = NULL;
  89
  90   return res;
  91 }
  92
  93
  94 /*-----------------------------------------------------------------------.
  95 | Print this list, for which every content_type must be SYMLIST_SYMBOL.  |
  96 `-----------------------------------------------------------------------*/
  97
  98 void
  99 symbol_list_syms_print (const symbol_list *l, FILE *f)
 100 {
 101   for (/* Nothing. */; l && l->content.sym; l = l->next)
 102     {
 103       symbol_print (l->content.sym, f);
 104       fprintf (stderr, l->used ? " used" : " unused");
 105       if (l && l->content.sym)
 106         fprintf (f, ", ");
 107     }
 108 }
 109
 110
 111 /*---------------------------.
 112 | Prepend NODE to the LIST.  |
 113 `---------------------------*/
 114
 115 symbol_list *
 116 symbol_list_prepend (symbol_list *list, symbol_list *node)
 117 {
 118   node->next = list;
 119   return node;
 120 }
 121
 122
 123 /*-----------------------------------------------.
 124 | Free the LIST, but not the items it contains.  |
 125 `-----------------------------------------------*/
 126
 127 void
 128 symbol_list_free (symbol_list *list)
 129 {
 130   LIST_FREE (symbol_list, list);
 131 }
 132
 133
 134 /*--------------------.
 135 | Return its length.  |
 136 `--------------------*/
 137
 138 int
 139 symbol_list_length (symbol_list const *l)
 140 {
 141   int res = 0;
 142   for (/* Nothing. */;
 143        l && !(l->content_type == SYMLIST_SYMBOL && l->content.sym == NULL);
 144        l = l->next)
 145     ++res;
 146   return res;
 147 }
 148
 149
 150 /*------------------------------.
 151 | Get item N in symbol list L.  |
 152 `------------------------------*/
 153
 154 symbol_list *
 155 symbol_list_n_get (symbol_list *l, int n)
 156 {
 157   int i;
 158
 159   if (n < 0)
 160     return NULL;
 161
 162   for (i = 0; i < n; ++i)
 163     {
 164       l = l->next;
 165       if (l == NULL
 166           || (l->content_type == SYMLIST_SYMBOL && l->content.sym == NULL))
 167         return NULL;
 168     }
 169
 170   return l;
 171 }
 172
 173
 174 /*--------------------------------------------------------------.
 175 | Get the data type (alternative in the union) of the value for |
 176 | symbol N in symbol list L.                                    |
 177 `--------------------------------------------------------------*/
 178
 179 uniqstr
 180 symbol_list_n_type_name_get (symbol_list *l, location loc, int n)
 181 {
 182   l = symbol_list_n_get (l, n);
 183   if (!l)
 184     {
 185       complain_at (loc, _("invalid $ value: $%d"), n);
 186       return NULL;
 187     }
 188   aver (l->content_type == SYMLIST_SYMBOL);
 189   return l->content.sym->type_name;
 190 }
 191
 192
 193 /*--------------------------------------.
 194 | The item N in symbol list L is USED.  |
 195 `--------------------------------------*/
 196
 197 void
 198 symbol_list_n_used_set (symbol_list *l, int n, bool used)
 199 {
 200   l = symbol_list_n_get (l, n);
 201   if (l)
 202     l->used = used;
 203 }
 204
 205 void
 206 symbol_list_destructor_set (symbol_list *node, const char *destructor,
 207                             location loc)
 208 {
 209   switch (node->content_type)
 210     {
 211       case SYMLIST_SYMBOL:
 212         symbol_destructor_set (node->content.sym, destructor, loc);
 213         break;
 214       case SYMLIST_TYPE:
 215         semantic_type_destructor_set (
 216           semantic_type_get (node->content.type_name), destructor, loc);
 217         break;
 218       case SYMLIST_DEFAULT:
 219         default_destructor_set (destructor, loc);
 220         break;
 221     }
 222 }
 223
 224 void
 225 symbol_list_printer_set (symbol_list *node, const char *printer, location loc)
 226 {
 227   switch (node->content_type)
 228     {
 229       case SYMLIST_SYMBOL:
 230         symbol_printer_set (node->content.sym, printer, loc);
 231         break;
 232       case SYMLIST_TYPE:
 233         semantic_type_printer_set (
 234           semantic_type_get (node->content.type_name), printer, loc);
 235         break;
 236       case SYMLIST_DEFAULT:
 237         default_printer_set (printer, loc);
 238         break;
 239     }
 240 }