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