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bbf2f4df PA |
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 "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. */ | |
32 | filename_seen_cache (const filename_seen_cache &) = delete; | |
33 | void operator= (const filename_seen_cache &) = delete; | |
34 | ||
35 | /* Empty the cache, but do not delete it. */ | |
36 | void clear (); | |
37 | ||
38 | /* If FILE is not already in the table of files in CACHE, add it and | |
39 | return false; otherwise return true. | |
40 | ||
41 | NOTE: We don't manage space for FILE, we assume FILE lives as | |
42 | long as the caller needs. */ | |
43 | bool seen (const char *file); | |
44 | ||
45 | /* Traverse all cache entries, calling CALLBACK on each. The | |
46 | filename is passed as argument to CALLBACK. */ | |
47 | void traverse (gdb::function_view<void (const char *filename)> callback) | |
48 | { | |
49 | auto erased_cb = [] (void **slot, void *info) -> int | |
50 | { | |
51 | auto filename = (const char *) *slot; | |
52 | auto restored_cb = (decltype (callback) *) info; | |
53 | (*restored_cb) (filename); | |
54 | return 1; | |
55 | }; | |
56 | ||
57 | htab_traverse_noresize (m_tab, erased_cb, &callback); | |
58 | } | |
59 | ||
60 | private: | |
61 | /* Table of files seen so far. */ | |
62 | htab_t m_tab; | |
63 | }; |