macro_table.c

   1 /*
   2  * smatch/macro_table.c
   3  *
   4  * Copyright (C) 2010 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include "lib.h"
  14 #include "parse.h"
  15 #include "cwchash/hashtable.h"
  16
  17 static struct hashtable *macro_table;
  18
  19 static DEFINE_HASHTABLE_INSERT(do_insert_macro, struct position, char);
  20 static DEFINE_HASHTABLE_SEARCH(do_search_macro, struct position, char);
  21
  22 static inline unsigned int position_hash(void *_pos)
  23 {
  24         struct position *pos = _pos;
  25
  26         return pos->line | (pos->pos << 22) | (pos->stream << 18);
  27 }
  28
  29 static inline int equalkeys(void *_pos1, void *_pos2)
  30 {
  31         struct position *pos1 = _pos1;
  32         struct position *pos2 = _pos2;
  33
  34         return pos1->line == pos2->line && pos1->pos == pos2->pos &&
  35                 pos1->stream == pos2->stream;
  36 }
  37
  38 void store_macro_pos(struct token *token)
  39 {
  40         if (!macro_table)
  41                 macro_table = create_hashtable(5000, position_hash, equalkeys);
  42
  43         if (get_macro_name(token->pos))
  44                 return;
  45
  46         do_insert_macro(macro_table, &token->pos, token->ident->name);
  47 }
  48
  49 char *get_macro_name(struct position pos)
  50 {
  51         return do_search_macro(macro_table, &pos);
  52 }