64c7036660
* m4/gccwarn.m4: Add the option. * bin/autfilt.cc, bin/common_output.hh, bin/dstar2tgba.cc, bin/ltl2tgba.cc, bin/ltl2tgta.cc, bin/ltlcross.cc, bin/ltldo.cc, bin/ltlfilt.cc, bin/ltlgrind.cc, spot/kripke/kripke.hh, spot/ltsmin/ltsmin.cc, spot/ta/ta.hh, spot/ta/tgtaproduct.hh, spot/taalgos/dot.cc, spot/taalgos/reachiter.hh, spot/taalgos/statessetbuilder.cc, spot/taalgos/stats.cc, spot/twa/twaproduct.cc, spot/twaalgos/emptiness.cc, spot/twaalgos/gtec/ce.cc, spot/twaalgos/lbtt.cc, spot/twaalgos/ndfs_result.hxx, spot/twaalgos/stats.hh, spot/twaalgos/tau03opt.cc, tests/core/ngraph.cc: Add suggested override qualifiers.
415 lines
11 KiB
C++
415 lines
11 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2009, 2011, 2012, 2014, 2015, 2016 Laboratoire de
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// Recherche et Développement de l'Epita (LRDE).
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// Copyright (C) 2003, 2004, 2006 Laboratoire d'Informatique de
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// Paris 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
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// Université Pierre et Marie Curie.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include <spot/twa/twaproduct.hh>
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#include <string>
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#include <cassert>
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#include <spot/misc/hashfunc.hh>
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#include <spot/kripke/kripke.hh>
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namespace spot
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{
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////////////////////////////////////////////////////////////
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// state_product
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state_product::~state_product()
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{
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left_->destroy();
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right_->destroy();
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}
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void
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state_product::destroy() const
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{
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if (--count_)
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return;
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fixed_size_pool* p = pool_;
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this->~state_product();
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p->deallocate(this);
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}
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int
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state_product::compare(const state* other) const
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{
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const state_product* o = down_cast<const state_product*>(other);
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assert(o);
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int res = left_->compare(o->left());
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if (res != 0)
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return res;
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return right_->compare(o->right());
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}
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size_t
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state_product::hash() const
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{
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// We assume that size_t is 32-bit wide.
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return wang32_hash(left_->hash()) ^ wang32_hash(right_->hash());
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}
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state_product*
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state_product::clone() const
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{
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++count_;
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return const_cast<state_product*>(this);
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}
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////////////////////////////////////////////////////////////
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// twa_succ_iterator_product
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namespace
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{
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class twa_succ_iterator_product_common: public twa_succ_iterator
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{
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public:
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twa_succ_iterator_product_common(twa_succ_iterator* left,
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twa_succ_iterator* right,
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const twa_product* prod,
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fixed_size_pool* pool)
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: left_(left), right_(right), prod_(prod), pool_(pool)
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{
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}
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void recycle(const const_twa_ptr& l, twa_succ_iterator* left,
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const_twa_ptr r, twa_succ_iterator* right)
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{
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l->release_iter(left_);
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left_ = left;
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r->release_iter(right_);
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right_ = right;
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}
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virtual ~twa_succ_iterator_product_common()
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{
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delete left_;
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delete right_;
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}
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virtual bool next_non_false_() = 0;
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bool first() override
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{
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if (!right_)
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return false;
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// If one of the two successor sets is empty initially, we
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// reset right_, so that done() can detect this situation
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// easily. (We choose to reset right_ because this variable
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// is already used by done().)
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if (!(left_->first() && right_->first()))
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{
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delete right_;
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right_ = nullptr;
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return false;
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}
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return next_non_false_();
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}
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bool done() const override
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{
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return !right_ || right_->done();
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}
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const state_product* dst() const override
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{
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return new(pool_->allocate()) state_product(left_->dst(),
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right_->dst(),
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pool_);
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}
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protected:
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twa_succ_iterator* left_;
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twa_succ_iterator* right_;
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const twa_product* prod_;
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fixed_size_pool* pool_;
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friend class spot::twa_product;
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};
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/// \brief Iterate over the successors of a product computed on the fly.
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class twa_succ_iterator_product final:
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public twa_succ_iterator_product_common
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{
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public:
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twa_succ_iterator_product(twa_succ_iterator* left,
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twa_succ_iterator* right,
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const twa_product* prod,
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fixed_size_pool* pool)
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: twa_succ_iterator_product_common(left, right, prod, pool)
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{
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}
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virtual ~twa_succ_iterator_product()
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{
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}
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bool step_()
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{
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if (left_->next())
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return true;
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left_->first();
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return right_->next();
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}
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bool next_non_false_() override
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{
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assert(!done());
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do
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{
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bdd l = left_->cond();
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bdd r = right_->cond();
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bdd current_cond = l & r;
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if (current_cond != bddfalse)
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{
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current_cond_ = current_cond;
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return true;
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}
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}
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while (step_());
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return false;
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}
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bool next() override
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{
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if (step_())
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return next_non_false_();
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return false;
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}
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bdd cond() const override
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{
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return current_cond_;
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}
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acc_cond::mark_t acc() const override
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{
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return left_->acc() | (right_->acc() << prod_->left_acc().num_sets());
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}
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protected:
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bdd current_cond_;
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};
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/// Iterate over the successors of a product computed on the fly.
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/// This one assumes that LEFT is an iterator over a Kripke structure
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class twa_succ_iterator_product_kripke final:
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public twa_succ_iterator_product_common
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{
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public:
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twa_succ_iterator_product_kripke(twa_succ_iterator* left,
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twa_succ_iterator* right,
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const twa_product* prod,
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fixed_size_pool* pool)
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: twa_succ_iterator_product_common(left, right, prod, pool)
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{
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}
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virtual ~twa_succ_iterator_product_kripke()
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{
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}
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bool next_non_false_() override
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{
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// All the transitions of left_ iterator have the
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// same label, because it is a Kripke structure.
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bdd l = left_->cond();
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assert(!right_->done());
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do
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{
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bdd r = right_->cond();
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bdd current_cond = l & r;
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if (current_cond != bddfalse)
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{
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current_cond_ = current_cond;
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return true;
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}
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}
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while (right_->next());
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return false;
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}
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bool next() override
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{
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if (left_->next())
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return true;
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left_->first();
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if (right_->next())
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return next_non_false_();
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return false;
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}
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bdd cond() const override
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{
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return current_cond_;
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}
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acc_cond::mark_t acc() const override
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{
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return right_->acc();
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}
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protected:
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bdd current_cond_;
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};
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} // anonymous
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////////////////////////////////////////////////////////////
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// twa_product
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twa_product::twa_product(const const_twa_ptr& left,
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const const_twa_ptr& right)
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: twa(left->get_dict()), left_(left), right_(right),
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pool_(sizeof(state_product))
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{
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if (left->get_dict() != right->get_dict())
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throw std::runtime_error("twa_product: left and right automata should "
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"share their bdd_dict");
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assert(get_dict() == right_->get_dict());
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// If one of the side is a Kripke structure, it is easier to deal
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// with (we don't have to fix the acceptance conditions, and
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// computing the successors can be improved a bit).
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if (dynamic_cast<const kripke*>(left_.get()))
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{
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left_kripke_ = true;
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}
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else if (dynamic_cast<const kripke*>(right_.get()))
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{
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std::swap(left_, right_);
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left_kripke_ = true;
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}
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else
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{
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left_kripke_ = false;
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}
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auto d = get_dict();
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d->register_all_propositions_of(&left_, this);
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d->register_all_propositions_of(&right_, this);
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assert(num_sets() == 0);
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auto left_num = left->num_sets();
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auto right_acc = right->get_acceptance() << left_num;
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right_acc &= left->get_acceptance();
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set_acceptance(left_num + right->num_sets(), right_acc);
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}
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twa_product::~twa_product()
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{
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// Make sure we delete the iterator cache before erasing the two
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// automata (by reference counting).
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delete iter_cache_;
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iter_cache_ = nullptr;
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}
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const state*
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twa_product::get_init_state() const
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{
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fixed_size_pool* p = const_cast<fixed_size_pool*>(&pool_);
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return new(p->allocate()) state_product(left_->get_init_state(),
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right_->get_init_state(), p);
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}
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twa_succ_iterator*
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twa_product::succ_iter(const state* state) const
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{
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const state_product* s = down_cast<const state_product*>(state);
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assert(s);
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twa_succ_iterator* li = left_->succ_iter(s->left());
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twa_succ_iterator* ri = right_->succ_iter(s->right());
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if (iter_cache_)
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{
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twa_succ_iterator_product_common* it =
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down_cast<twa_succ_iterator_product_common*>(iter_cache_);
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it->recycle(left_, li, right_, ri);
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iter_cache_ = nullptr;
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return it;
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}
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fixed_size_pool* p = const_cast<fixed_size_pool*>(&pool_);
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if (left_kripke_)
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return new twa_succ_iterator_product_kripke(li, ri, this, p);
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else
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return new twa_succ_iterator_product(li, ri, this, p);
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}
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const acc_cond& twa_product::left_acc() const
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{
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return left_->acc();
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}
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const acc_cond& twa_product::right_acc() const
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{
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return right_->acc();
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}
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std::string
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twa_product::format_state(const state* state) const
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{
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const state_product* s = down_cast<const state_product*>(state);
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assert(s);
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return (left_->format_state(s->left())
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+ " * "
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+ right_->format_state(s->right()));
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}
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state*
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twa_product::project_state(const state* s, const const_twa_ptr& t) const
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{
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const state_product* s2 = down_cast<const state_product*>(s);
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assert(s2);
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if (t.get() == this)
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return s2->clone();
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state* res = left_->project_state(s2->left(), t);
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if (res)
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return res;
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return right_->project_state(s2->right(), t);
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}
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//////////////////////////////////////////////////////////////////////
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// twa_product_init
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twa_product_init::twa_product_init(const const_twa_ptr& left,
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const const_twa_ptr& right,
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const state* left_init,
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const state* right_init)
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: twa_product(left, right),
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left_init_(left_init), right_init_(right_init)
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{
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if (left_ != left)
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std::swap(left_init_, right_init_);
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}
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const state*
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twa_product_init::get_init_state() const
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{
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fixed_size_pool* p = const_cast<fixed_size_pool*>(&pool_);
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return new(p->allocate()) state_product(left_init_->clone(),
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right_init_->clone(), p);
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}
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}
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