gdb/filename-seen-cache.c

   1 /* Filename-seen cache for the GNU debugger, GDB.
   2
   3    Copyright (C) 1986-2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program 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 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "filename-seen-cache.h"
  22 #include "filenames.h"
  23
  24   /* Initial size of the table.  It automagically grows from here.  */
  25 #define INITIAL_FILENAME_SEEN_CACHE_SIZE 100
  26
  27 /* filename_seen_cache constructor.  */
  28
  29 filename_seen_cache::filename_seen_cache ()
  30 {
  31   m_tab = htab_create_alloc (INITIAL_FILENAME_SEEN_CACHE_SIZE,
  32                              filename_hash, filename_eq,
  33                              NULL, xcalloc, xfree);
  34 }
  35
  36 /* See filename-seen-cache.h.  */
  37
  38 void
  39 filename_seen_cache::clear ()
  40 {
  41   htab_empty (m_tab);
  42 }
  43
  44 /* See filename-seen-cache.h.  */
  45
  46 filename_seen_cache::~filename_seen_cache ()
  47 {
  48   htab_delete (m_tab);
  49 }
  50
  51 /* See filename-seen-cache.h.  */
  52
  53 bool
  54 filename_seen_cache::seen (const char *file)
  55 {
  56   void **slot;
  57
  58   /* Is FILE in tab?  */
  59   slot = htab_find_slot (m_tab, file, INSERT);
  60   if (*slot != NULL)
  61     return true;
  62
  63   /* No; add it to tab.  */
  64   *slot = (char *) file;
  65   return false;
  66 }