lean2/src/library/definitions_cache.h

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/*
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include "util/thread.h"
#include "util/name_map.h"
#include "util/optional.h"
#include "kernel/expr.h"
namespace lean {
/** \brief Cache for mapping definitions (type, value) before elaboration to (level_names, type, value)
after elaboration.
*/
class definitions_cache {
typedef std::tuple<expr, expr, level_param_names, expr, expr> entry;
mutex m_mutex;
name_map<entry> m_definitions;
void add_core(name const & n, expr const & pre_type, expr const & pre_value, level_param_names const & ls,
expr const & type, expr const & value);
public:
definitions_cache();
/** \brief Add the cache entry (n, pre_type, pre_value) -> (ls, type, value) */
void add(name const & n, expr const & pre_type, expr const & pre_value, level_param_names const & ls, expr const & type, expr const & value);
/** \brief Return (if available) elaborated (level_names, type, value) for (n, pre_type, pre_value).
The pre_type and pre_value are compared modulo placeholders names if the cached values.
In principle, we could have compared only the name and pre_type, but we only want to use cached values if the
user intent (captured by pre_value) did not change.
*/
optional<std::tuple<level_param_names, expr, expr>> find(name const & n, expr const & pre_type, expr const & pre_value);
/** \brief Store the cache content into the given stream */
void save(std::ostream & out);
/** \brief Load the cache content from the given stream */
void load(std::istream & in);
/** \brief Remove the entry named \c n from the cache. */
void erase(name const & n) { m_definitions.erase(n); }
};
}