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 "scan-code.h"
  27 #include "symlist.h"
  28
  29
  30 /*--------------------------------------.
  31 | Create a list containing SYM at LOC.  |
  32 `--------------------------------------*/
  33
  34 symbol_list *
  35 symbol_list_sym_new (symbol *sym, location loc)
  36 {
  37   symbol_list *res = xmalloc (sizeof *res);
  38
  39   res->content_type = SYMLIST_SYMBOL;
  40   res->content.sym = sym;
  41   res->location = loc;
  42
  43   res->midrule = NULL;
  44   res->midrule_parent_rule = NULL;
  45   res->midrule_parent_rhs_index = 0;
  46
  47   code_props_none_init (&res->action_props);
  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 <*> at LOC.  |
  79 `----------------------------------------*/
  80
  81 symbol_list *
  82 symbol_list_default_tagged_new (location loc)
  83 {
  84   symbol_list *res = xmalloc (sizeof *res);
  85
  86   res->content_type = SYMLIST_DEFAULT_TAGGED;
  87   res->location = loc;
  88   res->next = NULL;
  89
  90   return res;
  91 }
  92
  93
  94 /*----------------------------------------.
  95 | Create a list containing a <!> at LOC.  |
  96 `----------------------------------------*/
  97
  98 symbol_list *
  99 symbol_list_default_tagless_new (location loc)
 100 {
 101   symbol_list *res = xmalloc (sizeof *res);
 102
 103   res->content_type = SYMLIST_DEFAULT_TAGLESS;
 104   res->location = loc;
 105   res->next = NULL;
 106
 107   return res;
 108 }
 109
 110
 111 /*-----------------------------------------------------------------------.
 112 | Print this list, for which every content_type must be SYMLIST_SYMBOL.  |
 113 `-----------------------------------------------------------------------*/
 114
 115 void
 116 symbol_list_syms_print (const symbol_list *l, FILE *f)
 117 {
 118   for (/* Nothing. */; l && l->content.sym; l = l->next)
 119     {
 120       symbol_print (l->content.sym, f);
 121       fprintf (stderr,
 122                code_props_is_value_used (l->action_props)
 123                ? " used" : " unused");
 124       if (l && l->content.sym)
 125         fprintf (f, ", ");
 126     }
 127 }
 128
 129
 130 /*---------------------------.
 131 | Prepend NODE to the LIST.  |
 132 `---------------------------*/
 133
 134 symbol_list *
 135 symbol_list_prepend (symbol_list *list, symbol_list *node)
 136 {
 137   node->next = list;
 138   return node;
 139 }
 140
 141
 142 /*-----------------------------------------------.
 143 | Free the LIST, but not the items it contains.  |
 144 `-----------------------------------------------*/
 145
 146 void
 147 symbol_list_free (symbol_list *list)
 148 {
 149   LIST_FREE (symbol_list, list);
 150 }
 151
 152
 153 /*--------------------.
 154 | Return its length.  |
 155 `--------------------*/
 156
 157 int
 158 symbol_list_length (symbol_list const *l)
 159 {
 160   int res = 0;
 161   for (/* Nothing. */;
 162        l && !(l->content_type == SYMLIST_SYMBOL && l->content.sym == NULL);
 163        l = l->next)
 164     ++res;
 165   return res;
 166 }
 167
 168
 169 /*------------------------------.
 170 | Get item N in symbol list L.  |
 171 `------------------------------*/
 172
 173 symbol_list *
 174 symbol_list_n_get (symbol_list *l, int n)
 175 {
 176   int i;
 177
 178   if (n < 0)
 179     return NULL;
 180
 181   for (i = 0; i < n; ++i)
 182     {
 183       l = l->next;
 184       if (l == NULL
 185           || (l->content_type == SYMLIST_SYMBOL && l->content.sym == NULL))
 186         return NULL;
 187     }
 188
 189   return l;
 190 }
 191
 192
 193 /*--------------------------------------------------------------.
 194 | Get the data type (alternative in the union) of the value for |
 195 | symbol N in symbol list L.                                    |
 196 `--------------------------------------------------------------*/
 197
 198 uniqstr
 199 symbol_list_n_type_name_get (symbol_list *l, location loc, int n)
 200 {
 201   l = symbol_list_n_get (l, n);
 202   if (!l)
 203     {
 204       complain_at (loc, _("invalid $ value: $%d"), n);
 205       return NULL;
 206     }
 207   aver (l->content_type == SYMLIST_SYMBOL);
 208   return l->content.sym->type_name;
 209 }
 210
 211
 212 void
 213 symbol_list_destructor_set (symbol_list *node, const char *code, location loc)
 214 {
 215   code_props destructor;
 216   code_props_symbol_action_init (&destructor, code, loc);
 217   code_props_translate_code (&destructor);
 218   switch (node->content_type)
 219     {
 220       case SYMLIST_SYMBOL:
 221         symbol_destructor_set (node->content.sym, destructor);
 222         break;
 223       case SYMLIST_TYPE:
 224         semantic_type_destructor_set (
 225           semantic_type_get (node->content.type_name), destructor);
 226         break;
 227       case SYMLIST_DEFAULT_TAGGED:
 228         default_tagged_destructor_set (destructor);
 229         break;
 230       case SYMLIST_DEFAULT_TAGLESS:
 231         default_tagless_destructor_set (destructor);
 232         break;
 233     }
 234 }
 235
 236 void
 237 symbol_list_printer_set (symbol_list *node, const char *code, location loc)
 238 {
 239   code_props printer;
 240   code_props_symbol_action_init (&printer, code, loc);
 241   code_props_translate_code (&printer);
 242   switch (node->content_type)
 243     {
 244       case SYMLIST_SYMBOL:
 245         symbol_printer_set (node->content.sym, printer);
 246         break;
 247       case SYMLIST_TYPE:
 248         semantic_type_printer_set (
 249           semantic_type_get (node->content.type_name), printer);
 250         break;
 251       case SYMLIST_DEFAULT_TAGGED:
 252         default_tagged_printer_set (printer);
 253         break;
 254       case SYMLIST_DEFAULT_TAGLESS:
 255         default_tagless_printer_set (printer);
 256         break;
 257     }
 258 }