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filename-seen-cache.h
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1/* Filename-seen cache for the GNU debugger, GDB.
2
3 Copyright (C) 1986-2023 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#ifndef FILENAME_SEEN_CACHE_H
21#define FILENAME_SEEN_CACHE_H
22
23#include "defs.h"
24#include "gdbsupport/function-view.h"
25#include "gdbsupport/gdb-hashtab.h"
26
27/* Cache to watch for file names already seen. */
28
30{
31public:
33
35
36 /* Empty the cache, but do not delete it. */
37 void clear ();
38
39 /* If FILE is not already in the table of files in CACHE, add it and
40 return false; otherwise return true.
41
42 NOTE: We don't manage space for FILE, we assume FILE lives as
43 long as the caller needs. */
44 bool seen (const char *file);
45
46 /* Traverse all cache entries, calling CALLBACK on each. The
47 filename is passed as argument to CALLBACK. */
48 void traverse (gdb::function_view<void (const char *filename)> callback)
49 {
50 auto erased_cb = [] (void **slot, void *info) -> int
51 {
52 auto filename = (const char *) *slot;
53 auto restored_cb = (decltype (callback) *) info;
54 (*restored_cb) (filename);
55 return 1;
56 };
57
58 htab_traverse_noresize (m_tab.get (), erased_cb, &callback);
59 }
60
61private:
62 /* Table of files seen so far. */
63 htab_up m_tab;
64};
65
66#endif /* FILENAME_SEEN_CACHE_H */
void traverse(gdb::function_view< void(const char *filename)> callback)
bool seen(const char *file)
DISABLE_COPY_AND_ASSIGN(filename_seen_cache)