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/********************* */
/*! \file inst_propagator.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds, Mathias Preiner
** This file is part of the CVC4 project.
** Copyright (c) 2009-2018 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Propagate mechanism for instantiations
**/
#include "cvc4_private.h"
#ifndef __CVC4__QUANTIFIERS_INST_PROPAGATOR_H
#define __CVC4__QUANTIFIERS_INST_PROPAGATOR_H
#include <iostream>
#include <map>
#include <string>
#include <vector>
#include "expr/node.h"
#include "expr/node_trie.h"
#include "expr/type_node.h"
#include "theory/quantifiers/instantiate.h"
#include "theory/quantifiers_engine.h"
namespace CVC4 {
namespace theory {
namespace quantifiers {
class EqualityQueryInstProp : public EqualityQuery {
private:
/** pointer to quantifiers engine */
QuantifiersEngine* d_qe;
public:
EqualityQueryInstProp( QuantifiersEngine* qe );
~EqualityQueryInstProp(){};
/** reset */
bool reset(Theory::Effort e) override;
/* Called for new quantifiers */
void registerQuantifier(Node q) override {}
/** identify */
std::string identify() const override { return "EqualityQueryInstProp"; }
/** extends engine */
bool extendsEngine() override { return true; }
/** contains term */
bool hasTerm(Node a) override;
/** get the representative of the equivalence class of a */
Node getRepresentative(Node a) override;
/** returns true if a and b are equal in the current context */
bool areEqual(Node a, Node b) override;
/** returns true is a and b are disequal in the current context */
bool areDisequal(Node a, Node b) override;
/** get the equality engine associated with this query */
eq::EqualityEngine* getEngine() override;
/** get the equivalence class of a */
void getEquivalenceClass(Node a, std::vector<Node>& eqc) override;
/** get congruent term */
TNode getCongruentTerm(Node f, std::vector<TNode>& args) override;
public:
/** get the representative of the equivalence class of a, with explanation */
Node getRepresentativeExp( Node a, std::vector< Node >& exp );
/** returns true if a and b are equal in the current context */
bool areEqualExp( Node a, Node b, std::vector< Node >& exp );
/** returns true is a and b are disequal in the current context */
bool areDisequalExp( Node a, Node b, std::vector< Node >& exp );
/** get congruent term */
TNode getCongruentTermExp( Node f, std::vector< TNode >& args, std::vector< Node >& exp );
private:
/** term index */
std::map<Node, TNodeTrie> d_uf_func_map_trie;
/** union find for terms beyond what is stored in equality engine */
std::map<Node, Node> d_uf;
std::map<Node, std::vector<Node> > d_uf_exp;
Node getUfRepresentative(Node a, std::vector<Node>& exp);
/** disequality list, stores explanations */
std::map<Node, std::map<Node, std::vector<Node> > > d_diseq_list;
/** add arg */
void addArgument(Node n,
std::vector<Node>& args,
std::vector<Node>& watch,
bool is_watch);
/** register term */
void registerUfTerm(TNode n);
public:
enum {
STATUS_CONFLICT,
STATUS_MERGED_KNOWN,
STATUS_MERGED_UNKNOWN,
STATUS_NONE,
};
/** set equal */
int setEqual( Node& a, Node& b, bool pol, std::vector< Node >& reason );
Node d_true;
Node d_false;
public:
//for explanations
static void merge_exp( std::vector< Node >& v, std::vector< Node >& v_to_merge, int up_to_size = -1 );
//for watch list
static void setWatchList( Node n, std::vector< Node >& watch, std::map< Node, std::vector< Node > >& watch_list_out );
static void collectWatchList( Node n, std::map< Node, std::vector< Node > >& watch_list_out, std::vector< Node >& watch_list );
Node evaluateTermExp( Node n, std::vector< Node >& exp, std::map< int, std::map< Node, Node > >& visited,
bool hasPol, bool pol, std::map< Node, std::vector< Node > >& watch_list_out, std::vector< Node >& props );
bool isPropagateLiteral( Node n );
};
class InstPropagator : public QuantifiersUtil {
private:
/** pointer to quantifiers engine */
QuantifiersEngine* d_qe;
/** notify class */
class InstantiationNotifyInstPropagator : public InstantiationNotify {
InstPropagator& d_ip;
public:
InstantiationNotifyInstPropagator(InstPropagator& ip): d_ip(ip) {}
bool notifyInstantiation(QuantifiersModule::QEffort quant_e,
Node q,
Node lem,
std::vector<Node>& terms,
Node body) override
{
return d_ip.notifyInstantiation( quant_e, q, lem, terms, body );
}
void filterInstantiations() override { d_ip.filterInstantiations(); }
};
InstantiationNotifyInstPropagator d_notify;
/** notify instantiation method */
bool notifyInstantiation(QuantifiersModule::QEffort quant_e,
Node q,
Node lem,
std::vector<Node>& terms,
Node body);
/** remove instance ids */
void filterInstantiations();
/** allocate instantiation */
unsigned allocateInstantiation( Node q, Node lem, std::vector< Node >& terms, Node body );
/** equality query */
EqualityQueryInstProp d_qy;
class InstInfo {
public:
bool d_active;
Node d_q;
Node d_lem;
std::vector< Node > d_terms;
// the current entailed body
Node d_curr;
//explanation for current entailed body
std::vector< Node > d_curr_exp;
void init( Node q, Node lem, std::vector< Node >& terms, Node body );
};
/** instantiation count/info */
unsigned d_icount;
std::map< unsigned, InstInfo > d_ii;
std::map< Node, unsigned > d_conc_to_id[2];
/** are we in conflict */
bool d_conflict;
/** watch list */
std::map< Node, std::map< unsigned, bool > > d_watch_list;
/** update list */
std::vector< unsigned > d_update_list;
/** relevant instances */
std::map< unsigned, bool > d_relevant_inst;
bool d_has_relevant_inst;
private:
bool update( unsigned id, InstInfo& i, bool firstTime = false );
void propagate( Node a, Node b, bool pol, std::vector< Node >& exp );
void conflict( std::vector< Node >& exp );
bool cacheConclusion( unsigned id, Node body, int prop_index = 0 );
void addRelevantInstances( std::vector< Node >& exp, const char * c );
void debugPrintExplanation( std::vector< Node >& exp, const char * c );
public:
InstPropagator( QuantifiersEngine* qe );
~InstPropagator(){}
/** reset */
bool reset(Theory::Effort e) override;
/* Called for new quantifiers */
void registerQuantifier(Node q) override {}
/** identify */
std::string identify() const override { return "InstPropagator"; }
/** get the notify mechanism */
InstantiationNotify* getInstantiationNotify() { return &d_notify; }
};
}
}
}
#endif
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