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/* Filename-seen cache for the GNU debugger, GDB.
Copyright (C) 1986-2017 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "common/function-view.h"
/* Cache to watch for file names already seen. */
class filename_seen_cache
{
public:
filename_seen_cache ();
~filename_seen_cache ();
/* Disable copy. */
filename_seen_cache (const filename_seen_cache &) = delete;
void operator= (const filename_seen_cache &) = delete;
/* Empty the cache, but do not delete it. */
void clear ();
/* If FILE is not already in the table of files in CACHE, add it and
return false; otherwise return true.
NOTE: We don't manage space for FILE, we assume FILE lives as
long as the caller needs. */
bool seen (const char *file);
/* Traverse all cache entries, calling CALLBACK on each. The
filename is passed as argument to CALLBACK. */
void traverse (gdb::function_view<void (const char *filename)> callback)
{
auto erased_cb = [] (void **slot, void *info) -> int
{
auto filename = (const char *) *slot;
auto restored_cb = (decltype (callback) *) info;
(*restored_cb) (filename);
return 1;
};
htab_traverse_noresize (m_tab, erased_cb, &callback);
}
private:
/* Table of files seen so far. */
htab_t m_tab;
};
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