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/* Helper class for deferring path creation until a diagnostic is emitted.
Copyright (C) 2024 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>
This file is part of GCC.
GCC 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, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_LAZY_DIAGNOSTIC_PATH_H
#define GCC_LAZY_DIAGNOSTIC_PATH_H
#include "diagnostic-path.h"
/* An implementation of diagnostic_path which has a trivial ctor
and lazily creates another diagnostic_path the first time the path
is queried, deferring to this inner path for all queries.
Use this to avoid expensive path creation logic when creating
rich_location instances, so that expense can be deferred until the path
is actually used by a diagnostic, and thus avoided for warnings that
are disabled. */
class lazy_diagnostic_path : public diagnostic_path
{
public:
virtual ~lazy_diagnostic_path () {}
unsigned num_events () const final override;
const diagnostic_event & get_event (int idx) const final override;
unsigned num_threads () const final override;
const diagnostic_thread &
get_thread (diagnostic_thread_id_t) const final override;
bool
same_function_p (int event_idx_a,
int event_idx_b) const final override;
bool generated_p () const { return m_inner_path != nullptr; }
private:
void lazily_generate_path () const;
virtual std::unique_ptr<diagnostic_path> make_inner_path () const = 0;
mutable std::unique_ptr<diagnostic_path> m_inner_path;
};
#endif /* ! GCC_LAZY_DIAGNOSTIC_PATH_H */
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