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/********************* */
/*! \file synth_engine.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds, Mathias Preiner, Morgan Deters
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 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 The quantifiers module for managing all approaches to synthesis,
** in particular, those described in Reynolds et al CAV 2015.
**/
#include "cvc4_private.h"
#ifndef CVC4__THEORY__QUANTIFIERS__SYNTH_ENGINE_H
#define CVC4__THEORY__QUANTIFIERS__SYNTH_ENGINE_H
#include "context/cdhashmap.h"
#include "theory/quantifiers/quant_util.h"
#include "theory/quantifiers/sygus/synth_conjecture.h"
namespace CVC4 {
namespace theory {
namespace quantifiers {
class SynthEngine : public QuantifiersModule
{
typedef context::CDHashMap<Node, bool, NodeHashFunction> NodeBoolMap;
private:
/** the conjecture formula(s) we are waiting to assign */
std::vector<Node> d_waiting_conj;
/** The synthesis conjectures that this class is managing. */
std::vector<std::unique_ptr<SynthConjecture> > d_conjs;
/**
* The first conjecture in the above vector. We track this conjecture
* so that a synthesis conjecture can be preregistered during a call to
* preregisterAssertion.
*/
SynthConjecture* d_conj;
/** assign quantified formula q as a conjecture
*
* This method either assigns q to a synthesis conjecture object in d_conjs,
* or otherwise reduces q to an equivalent form. This method does the latter
* if this class determines that it would rather rewrite q to an equivalent
* form r (in which case this method returns the lemma q <=> r). An example of
* this is the quantifier elimination step option::sygusQePreproc().
*/
void assignConjecture(Node q);
/** check conjecture
*
* This method returns true if the conjecture is finished processing solutions
* for this call to SynthEngine::check().
*/
bool checkConjecture(SynthConjecture* conj);
public:
SynthEngine(QuantifiersEngine* qe, context::Context* c);
~SynthEngine();
bool needsCheck(Theory::Effort e) override;
QEffort needsModel(Theory::Effort e) override;
/* Call during quantifier engine's check */
void check(Theory::Effort e, QEffort quant_e) override;
/* Called for new quantifiers */
void registerQuantifier(Node q) override;
/** Identify this module (for debugging, dynamic configuration, etc..) */
std::string identify() const override { return "SynthEngine"; }
/** print solution for synthesis conjectures */
void printSynthSolution(std::ostream& out);
/** get synth solutions
*
* This function adds entries to sol_map that map functions-to-synthesize
* with their solutions, for all active conjectures (currently just the one
* assigned to d_conj). This should be called immediately after the solver
* answers unsat for sygus input.
*
* For details on what is added to sol_map, see
* SynthConjecture::getSynthSolutions.
*/
void getSynthSolutions(std::map<Node, Node>& sol_map);
/** preregister assertion (before rewrite)
*
* The purpose of this method is to inform the solution reconstruction
* techniques within the single invocation module that n is an original
* assertion. This is used as a heuristic to remember terms that are likely
* to help when trying to reconstruct a solution that fits a given input
* syntax.
*/
void preregisterAssertion(Node n);
public:
class Statistics
{
public:
IntStat d_cegqi_lemmas_ce;
IntStat d_cegqi_lemmas_refine;
IntStat d_cegqi_si_lemmas;
IntStat d_solutions;
IntStat d_filtered_solutions;
IntStat d_candidate_rewrites_print;
Statistics();
~Statistics();
}; /* class SynthEngine::Statistics */
Statistics d_statistics;
}; /* class SynthEngine */
} // namespace quantifiers
} // namespace theory
} /* namespace CVC4 */
#endif
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