src/symlist.c

   1 /* Lists of symbols for Bison
   2
   3    Copyright (C) 2002, 2005-2007, 2009-2012 Free Software Foundation,
   4    Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include <config.h>
  22 #include "system.h"
  23
  24 #include "complain.h"
  25 #include "symlist.h"
  26
  27 /*--------------------------------------.
  28 | Create a list containing SYM at LOC.  |
  29 `--------------------------------------*/
  30
  31 symbol_list *
  32 symbol_list_sym_new (symbol *sym, location loc)
  33 {
  34   symbol_list *res = xmalloc (sizeof *res);
  35
  36   res->content_type = SYMLIST_SYMBOL;
  37   res->content.sym = sym;
  38   res->location = res->sym_loc = loc;
  39
  40   res->midrule = NULL;
  41   res->midrule_parent_rule = NULL;
  42   res->midrule_parent_rhs_index = 0;
  43
  44   code_props_none_init (&res->action_props);
  45
  46   res->ruleprec = NULL;
  47   res->dprec = 0;
  48   res->merger = 0;
  49
  50   res->named_ref = NULL;
  51
  52   res->next = NULL;
  53
  54   return res;
  55 }
  56
  57
  58 /*--------------------------------------------.
  59 | Create a list containing TYPE_NAME at LOC.  |
  60 `--------------------------------------------*/
  61
  62 symbol_list *
  63 symbol_list_type_new (uniqstr type_name, location loc)
  64 {
  65   symbol_list *res = xmalloc (sizeof *res);
  66
  67   res->content_type = SYMLIST_TYPE;
  68   res->content.sem_type = xmalloc (sizeof (semantic_type));
  69   res->content.sem_type->tag = type_name;
  70   res->content.sem_type->location = loc;
  71   res->content.sem_type->status = undeclared;
  72
  73   res->location = res->sym_loc = loc;
  74   res->named_ref = NULL;
  75   res->next = NULL;
  76
  77   return res;
  78 }
  79
  80
  81 /*-----------------------------------------------------------------------.
  82 | Print this list, for which every content_type must be SYMLIST_SYMBOL.  |
  83 `-----------------------------------------------------------------------*/
  84
  85 void
  86 symbol_list_syms_print (const symbol_list *l, FILE *f)
  87 {
  88   for (/* Nothing. */; l && l->content.sym; l = l->next)
  89     {
  90       symbol_print (l->content.sym, f);
  91       fprintf (stderr, l->action_props.is_value_used ? " used" : " unused");
  92       if (l && l->content.sym)
  93         fprintf (f, ", ");
  94     }
  95 }
  96
  97
  98 /*---------------------------.
  99 | Prepend NODE to the LIST.  |
 100 `---------------------------*/
 101
 102 symbol_list *
 103 symbol_list_prepend (symbol_list *list, symbol_list *node)
 104 {
 105   node->next = list;
 106   return node;
 107 }
 108
 109
 110 /*-----------------------------------------------.
 111 | Free the LIST, but not the items it contains.  |
 112 `-----------------------------------------------*/
 113
 114 void
 115 symbol_list_free (symbol_list *list)
 116 {
 117   symbol_list *node, *next;
 118   for (node = list; node; node = next)
 119     {
 120       next = node->next;
 121       named_ref_free (node->named_ref);
 122       if (node->content_type == SYMLIST_TYPE)
 123         free (node->content.sem_type);
 124       free (node);
 125     }
 126 }
 127
 128
 129 /*--------------------.
 130 | Return its length.  |
 131 `--------------------*/
 132
 133 int
 134 symbol_list_length (symbol_list const *l)
 135 {
 136   int res = 0;
 137   for (/* Nothing. */;
 138        l && !(l->content_type == SYMLIST_SYMBOL && l->content.sym == NULL);
 139        l = l->next)
 140     ++res;
 141   return res;
 142 }
 143
 144
 145 /*------------------------------.
 146 | Get item N in symbol list L.  |
 147 `------------------------------*/
 148
 149 symbol_list *
 150 symbol_list_n_get (symbol_list *l, int n)
 151 {
 152   int i;
 153
 154   if (n < 0)
 155     return NULL;
 156
 157   for (i = 0; i < n; ++i)
 158     {
 159       l = l->next;
 160       if (l == NULL
 161           || (l->content_type == SYMLIST_SYMBOL && l->content.sym == NULL))
 162         return NULL;
 163     }
 164
 165   return l;
 166 }
 167
 168
 169 /*--------------------------------------------------------------.
 170 | Get the data type (alternative in the union) of the value for |
 171 | symbol N in symbol list L.                                    |
 172 `--------------------------------------------------------------*/
 173
 174 uniqstr
 175 symbol_list_n_type_name_get (symbol_list *l, location loc, int n)
 176 {
 177   l = symbol_list_n_get (l, n);
 178   if (!l)
 179     {
 180       complain (&loc, complaint, _("invalid $ value: $%d"), n);
 181       return NULL;
 182     }
 183   aver (l->content_type == SYMLIST_SYMBOL);
 184   return l->content.sym->type_name;
 185 }
 186
 187 bool
 188 symbol_list_null (symbol_list *node)
 189 {
 190   return !node ||
 191     (node->content_type == SYMLIST_SYMBOL && !(node->content.sym));
 192 }
 193
 194 void
 195 symbol_list_code_props_set (symbol_list *node, code_props_type kind,
 196                             code_props const *cprops)
 197 {
 198   switch (node->content_type)
 199     {
 200     case SYMLIST_SYMBOL:
 201       symbol_code_props_set (node->content.sym, kind, cprops);
 202       if (node->content.sym->status == undeclared)
 203         node->content.sym->status = used;
 204       break;
 205     case SYMLIST_TYPE:
 206       semantic_type_code_props_set
 207         (semantic_type_get (node->content.sem_type->tag,
 208                             &node->content.sem_type->location),
 209          kind, cprops);
 210       if (node->content.sem_type->status == undeclared)
 211         node->content.sem_type->status = used;
 212       break;
 213     }
 214 }