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/tmp/gdb-8.1/gdb/filename-seen-cache.h
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1 /* Filename-seen cache for the GNU debugger, GDB.
2
3 Copyright (C) 1986-2018 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 "common/function-view.h"
22
23 /* Cache to watch for file names already seen. */
24
25 class filename_seen_cache
26 {
27 public:
28 filename_seen_cache ();
29 ~filename_seen_cache ();
30
31 DISABLE_COPY_AND_ASSIGN (filename_seen_cache);
32
33 /* Empty the cache, but do not delete it. */
34 void clear ();
35
36 /* If FILE is not already in the table of files in CACHE, add it and
37 return false; otherwise return true.
38
39 NOTE: We don't manage space for FILE, we assume FILE lives as
40 long as the caller needs. */
41 bool seen (const char *file);
42
43 /* Traverse all cache entries, calling CALLBACK on each. The
44 filename is passed as argument to CALLBACK. */
45 void traverse (gdb::function_view<void (const char *filename)> callback)
46 {
47 auto erased_cb = [] (void **slot, void *info) -> int
48 {
49 auto filename = (const char *) *slot;
50 auto restored_cb = (decltype (callback) *) info;
51 (*restored_cb) (filename);
52 return 1;
53 };
54
55 htab_traverse_noresize (m_tab, erased_cb, &callback);
56 }
57
58 private:
59 /* Table of files seen so far. */
60 htab_t m_tab;
61 };
filename_seen_cache::filename_seen_cache
filename_seen_cache()
Definition: filename-seen-cache.c:29
function-view.h
filename_seen_cache::DISABLE_COPY_AND_ASSIGN
DISABLE_COPY_AND_ASSIGN(filename_seen_cache)
filename_seen_cache::traverse
void traverse(gdb::function_view< void(const char *filename)> callback)
Definition: filename-seen-cache.h:45
defs.h
filename_seen_cache::~filename_seen_cache
~filename_seen_cache()
Definition: filename-seen-cache.c:46
filename_seen_cache
Definition: filename-seen-cache.h:25
gdb::function_view
Definition: function-view.h:177
filename_seen_cache::seen
bool seen(const char *file)
Definition: filename-seen-cache.c:54
filename_seen_cache::clear
void clear()
Definition: filename-seen-cache.c:39
filename_seen_cache::m_tab
htab_t m_tab
Definition: filename-seen-cache.h:60