macro_table.c

   1 /*
   2  * sparse/macro_table.c
   3  *
   4  * Copyright (C) 2010 Dan Carpenter.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include "lib.h"
  29 #include "parse.h"
  30 #include "cwchash/hashtable.h"
  31
  32 static struct hashtable *macro_table;
  33
  34 static DEFINE_HASHTABLE_INSERT(do_insert_macro, struct position, char);
  35 static DEFINE_HASHTABLE_SEARCH(do_search_macro, struct position, char);
  36
  37 static inline unsigned int position_hash(void *_pos)
  38 {
  39         struct position *pos = _pos;
  40
  41         return pos->line | (pos->pos << 22) | (pos->stream << 18);
  42 }
  43
  44 static inline int equalkeys(void *_pos1, void *_pos2)
  45 {
  46         struct position *pos1 = _pos1;
  47         struct position *pos2 = _pos2;
  48
  49         return pos1->line == pos2->line && pos1->pos == pos2->pos &&
  50                 pos1->stream == pos2->stream;
  51 }
  52
  53 void store_macro_pos(struct token *token)
  54 {
  55         if (!macro_table)
  56                 macro_table = create_hashtable(5000, position_hash, equalkeys);
  57
  58         if (get_macro_name(token->pos))
  59                 return;
  60
  61         do_insert_macro(macro_table, &token->pos, token->ident->name);
  62 }
  63
  64 char *get_macro_name(struct position pos)
  65 {
  66         return do_search_macro(macro_table, &pos);
  67 }