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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Morgan Deters, Aina Niemetz |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Implementation of quantifier utilities |
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*/ |
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#include "theory/quantifiers/quant_util.h" |
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#include "theory/quantifiers/term_util.h" |
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using namespace cvc5::kind; |
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namespace cvc5 { |
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namespace theory { |
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QuantifiersUtil::QuantifiersUtil(Env& env) : EnvObj(env) {} |
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QuantPhaseReq::QuantPhaseReq( Node n, bool computeEq ){ |
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initialize( n, computeEq ); |
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} |
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void QuantPhaseReq::initialize( Node n, bool computeEq ){ |
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std::map< Node, int > phaseReqs2; |
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computePhaseReqs( n, false, phaseReqs2 ); |
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for( std::map< Node, int >::iterator it = phaseReqs2.begin(); it != phaseReqs2.end(); ++it ){ |
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if( it->second==1 ){ |
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d_phase_reqs[ it->first ] = true; |
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}else if( it->second==-1 ){ |
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d_phase_reqs[ it->first ] = false; |
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} |
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} |
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Debug("inst-engine-phase-req") << "Phase requirements for " << n << ":" << std::endl; |
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//now, compute if any patterns are equality required |
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if( computeEq ){ |
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for( std::map< Node, bool >::iterator it = d_phase_reqs.begin(); it != d_phase_reqs.end(); ++it ){ |
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Debug("inst-engine-phase-req") << " " << it->first << " -> " << it->second << std::endl; |
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if( it->first.getKind()==EQUAL ){ |
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if( quantifiers::TermUtil::hasInstConstAttr(it->first[0]) ){ |
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if( !quantifiers::TermUtil::hasInstConstAttr(it->first[1]) ){ |
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d_phase_reqs_equality_term[ it->first[0] ] = it->first[1]; |
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d_phase_reqs_equality[ it->first[0] ] = it->second; |
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Debug("inst-engine-phase-req") << " " << it->first[0] << ( it->second ? " == " : " != " ) << it->first[1] << std::endl; |
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} |
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}else if( quantifiers::TermUtil::hasInstConstAttr(it->first[1]) ){ |
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d_phase_reqs_equality_term[ it->first[1] ] = it->first[0]; |
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d_phase_reqs_equality[ it->first[1] ] = it->second; |
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Debug("inst-engine-phase-req") << " " << it->first[1] << ( it->second ? " == " : " != " ) << it->first[0] << std::endl; |
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} |
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} |
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} |
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} |
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} |
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void QuantPhaseReq::computePhaseReqs( Node n, bool polarity, std::map< Node, int >& phaseReqs ){ |
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bool newReqPol = false; |
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bool newPolarity; |
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if( n.getKind()==NOT ){ |
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newReqPol = true; |
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newPolarity = !polarity; |
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}else if( n.getKind()==OR || n.getKind()==IMPLIES ){ |
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if( !polarity ){ |
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newReqPol = true; |
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newPolarity = false; |
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} |
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}else if( n.getKind()==AND ){ |
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if( polarity ){ |
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newReqPol = true; |
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newPolarity = true; |
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} |
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}else{ |
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int val = polarity ? 1 : -1; |
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if( phaseReqs.find( n )==phaseReqs.end() ){ |
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phaseReqs[n] = val; |
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}else if( val!=phaseReqs[n] ){ |
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phaseReqs[n] = 0; |
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} |
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} |
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if( newReqPol ){ |
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for( int i=0; i<(int)n.getNumChildren(); i++ ){ |
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if( n.getKind()==IMPLIES && i==0 ){ |
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computePhaseReqs( n[i], !newPolarity, phaseReqs ); |
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}else{ |
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computePhaseReqs( n[i], newPolarity, phaseReqs ); |
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} |
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} |
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} |
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} |
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void QuantPhaseReq::getPolarity( |
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Node n, size_t child, bool hasPol, bool pol, bool& newHasPol, bool& newPol) |
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{ |
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if( n.getKind()==AND || n.getKind()==OR || n.getKind()==SEP_STAR ){ |
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newHasPol = hasPol; |
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newPol = pol; |
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}else if( n.getKind()==IMPLIES ){ |
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newHasPol = hasPol; |
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newPol = child==0 ? !pol : pol; |
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}else if( n.getKind()==NOT ){ |
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newHasPol = hasPol; |
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newPol = !pol; |
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}else if( n.getKind()==ITE ){ |
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newHasPol = (child!=0) && hasPol; |
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newPol = pol; |
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}else if( n.getKind()==FORALL ){ |
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newHasPol = (child==1) && hasPol; |
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newPol = pol; |
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}else{ |
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newHasPol = false; |
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newPol = false; |
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} |
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} |
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void QuantPhaseReq::getEntailPolarity( |
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Node n, size_t child, bool hasPol, bool pol, bool& newHasPol, bool& newPol) |
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{ |
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if( n.getKind()==AND || n.getKind()==OR || n.getKind()==SEP_STAR ){ |
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newHasPol = hasPol && pol!=( n.getKind()==OR ); |
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newPol = pol; |
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}else if( n.getKind()==IMPLIES ){ |
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newHasPol = hasPol && !pol; |
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newPol = child==0 ? !pol : pol; |
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}else if( n.getKind()==NOT ){ |
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newHasPol = hasPol; |
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newPol = !pol; |
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}else{ |
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newHasPol = false; |
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newPol = false; |
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} |
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} |
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} // namespace theory |
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} // namespace cvc5 |