2013-11-21 01:02:41 +00:00
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/*
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Copyright (c) 2013 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 <algorithm>
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2013-11-22 02:39:33 +00:00
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#include <utility>
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2013-11-21 18:44:53 +00:00
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#include <memory>
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2013-11-21 20:34:37 +00:00
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#include <mutex>
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#include "util/lazy_list.h"
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2013-11-21 23:51:29 +00:00
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#include "library/io_state.h"
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#include "library/tactic/proof_state.h"
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namespace lean {
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typedef lazy_list<proof_state> proof_state_seq;
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class tactic_cell {
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void dealloc() { delete this; }
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MK_LEAN_RC();
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public:
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tactic_cell():m_rc(0) {}
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virtual ~tactic_cell() {}
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virtual proof_state_seq operator()(environment const & env, io_state const & io, proof_state const & s) = 0;
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};
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class tactic {
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protected:
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tactic_cell * m_ptr;
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public:
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explicit tactic(tactic_cell * ptr):m_ptr(ptr) { if (m_ptr) m_ptr->inc_ref(); }
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tactic(tactic const & s):m_ptr(s.m_ptr) { if (m_ptr) m_ptr->inc_ref(); }
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tactic(tactic && s):m_ptr(s.m_ptr) { s.m_ptr = nullptr; }
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~tactic() { if (m_ptr) m_ptr->dec_ref(); }
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friend void swap(tactic & a, tactic & b) { std::swap(a.m_ptr, b.m_ptr); }
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tactic & operator=(tactic const & s);
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tactic & operator=(tactic && s);
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proof_state_seq operator()(environment const & env, io_state const & io, proof_state const & s) { return m_ptr->operator()(env, io, s); }
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expr solve(environment const & env, io_state const & io, proof_state const & s);
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2013-11-22 01:25:19 +00:00
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expr solve(environment const & env, io_state const & io, context const & ctx, expr const & t);
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};
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2013-11-21 23:31:55 +00:00
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template<typename F>
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class simple_tactic_cell : public tactic_cell {
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F m_f;
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public:
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simple_tactic_cell(F && f):m_f(f) {}
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virtual proof_state_seq operator()(environment const & env, io_state const & io, proof_state const & s) {
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return m_f(env, io, s);
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}
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};
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2013-11-23 00:15:03 +00:00
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/**
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\brief Create a tactic using the given functor.
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The functor must contain the operator:
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<code>
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proof_state_seq operator()(environment const & env, io_state const & io, proof_state const & s)
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</code>
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*/
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template<typename F>
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tactic mk_tactic(F && f) { return tactic(new simple_tactic_cell<F>(std::forward<F>(f))); }
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2013-11-23 00:15:03 +00:00
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/**
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\brief Return a "do nothing" tactic (aka skip).
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*/
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tactic id_tactic();
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/**
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\brief Return a tactic the always fails.
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*/
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tactic fail_tactic();
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/**
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\brief Return a tactic that fails if there are unsolved goals.
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*/
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tactic now_tactic();
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/**
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\brief Return a tactic that solves any goal of the form <tt>..., H : A, ... |- A</tt>.
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*/
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tactic assumption_tactic();
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/**
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\brief Return a tactic that performs \c t1 followed by \c t2.
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*/
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tactic then(tactic t1, tactic t2);
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/**
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\brief Return a tactic that applies \c t1, and if \c t1 returns the empty sequence of states,
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then applies \c t2.
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*/
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tactic orelse(tactic t1, tactic t2);
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/**
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\brief Return a tactic that tries the tactic \c t for at most \c ms milliseconds.
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If the tactic does not terminate in \c ms milliseconds, then the empty
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sequence is returned.
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\remark the tactic \c t is executed in a separate execution thread.
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\remark \c check_ms is how often the main thread checks whether the child
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thread finished.
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*/
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2013-11-22 23:51:17 +00:00
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tactic try_for(tactic t, unsigned ms, unsigned check_ms = 1);
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2013-11-23 00:15:03 +00:00
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/**
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\brief Execute both tactics and and combines their results.
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The results produced by tactic \c t1 are listed before the ones
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from tactic \c t2.
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*/
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tactic append(tactic t1, tactic t2);
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/**
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\brief Execute both tactics and and combines their results.
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The results produced by tactics \c t1 and \c t2 are interleaved
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to guarantee fairness.
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*/
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tactic interleave(tactic t1, tactic t2);
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/**
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\brief Return a tactic that executs \c t1 and \c t2 in parallel.
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It returns the sequence produced by the first to terminate.
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\remark \c check_ms is how often the main thread checks whether the children
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threads finished.
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*/
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tactic par(tactic t1, tactic t2, unsigned check_ms = 1);
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2013-11-22 02:39:33 +00:00
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tactic repeat(tactic t1);
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2013-11-21 20:34:37 +00:00
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}
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