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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/theory/quantifiers/quant_split.cpp	Lines:	99	101	98.0 %
Date:	2021-08-20	Branches:	197	372	53.0 %


/******************************************************************************
 * Top contributors (to current version):
 *   Andrew Reynolds, Mathias Preiner, Aina Niemetz
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 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.
 * ****************************************************************************
 *
 * Implementation of dynamic quantifiers splitting.
 */

#include "theory/quantifiers/quant_split.h"

#include "expr/dtype.h"
#include "expr/dtype_cons.h"
#include "theory/quantifiers/term_database.h"
#include "theory/quantifiers/first_order_model.h"
#include "options/quantifiers_options.h"

using namespace cvc5::kind;

namespace cvc5 {
namespace theory {
namespace quantifiers {

QuantDSplit::QuantDSplit(QuantifiersState& qs,
                         QuantifiersInferenceManager& qim,
                         QuantifiersRegistry& qr,
                         TermRegistry& tr)
    : QuantifiersModule(qs, qim, qr, tr), d_added_split(qs.getUserContext())
{
}

void QuantDSplit::checkOwnership(Node q)
{
  // If q is non-standard (marked as sygus, quantifier elimination, etc.), then
  // do no split it.
  QAttributes qa;
  QuantAttributes::computeQuantAttributes(q, qa);
  if (!qa.isStandard())
  {
    return;
  }
  bool takeOwnership = false;
  bool doSplit = false;
  QuantifiersBoundInference& qbi = d_qreg.getQuantifiersBoundInference();
  Trace("quant-dsplit-debug") << "Check split quantified formula : " << q << std::endl;
  for( unsigned i=0; i<q[0].getNumChildren(); i++ ){
    TypeNode tn = q[0][i].getType();
    if( tn.isDatatype() ){
      bool isFinite = d_qstate.isFiniteType(tn);
      const DType& dt = tn.getDType();
      if (dt.isRecursiveSingleton(tn))
      {
        Trace("quant-dsplit-debug") << "Datatype " << dt.getName() << " is recursive singleton." << std::endl;
      }
      else
      {
        if (options::quantDynamicSplit() == options::QuantDSplitMode::AGG)
        {
          // split if it is a finite datatype
          doSplit = isFinite;
        }
        else if (options::quantDynamicSplit()
                 == options::QuantDSplitMode::DEFAULT)
        {
          if (!qbi.isFiniteBound(q, q[0][i]))
          {
            if (isFinite)
            {
              // split if goes from being unhandled -> handled by finite
              // instantiation. An example is datatypes with uninterpreted sort
              // fields which are "interpreted finite" but not "finite".
              doSplit = true;
              // we additionally take ownership of this formula, in other words,
              // we mark it reduced.
              takeOwnership = true;
            }
            else if (dt.getNumConstructors() == 1 && !dt.isCodatatype())
            {
              // split if only one constructor
              doSplit = true;
            }
          }
        }
        if (doSplit)
        {
          // store the index to split
          d_quant_to_reduce[q] = i;
          Trace("quant-dsplit-debug")
              << "Split at index " << i << " based on datatype " << dt.getName()
              << std::endl;
          break;
        }
        Trace("quant-dsplit-debug")
            << "Do not split based on datatype " << dt.getName() << std::endl;
      }
    }
  }

  if (takeOwnership)
  {
    Trace("quant-dsplit-debug") << "Will take ownership." << std::endl;
    d_qreg.setOwner(q, this);
  }
  // Notice we may not take ownership in some cases, meaning that both the
  // original quantified formula and the split one are generated. This may
  // increase our ability to answer "unsat", since quantifier instantiation
  // heuristics may be more effective for one or the other (see issues #993
  // and 3481).
}

/* whether this module needs to check this round */
bool QuantDSplit::needsCheck( Theory::Effort e ) {
  return e>=Theory::EFFORT_FULL && !d_quant_to_reduce.empty();
}

bool QuantDSplit::checkCompleteFor( Node q ) {
  // true if we split q
  return d_added_split.find( q )!=d_added_split.end();
}

/* Call during quantifier engine's check */
void QuantDSplit::check(Theory::Effort e, QEffort quant_e)
{
  //add lemmas ASAP (they are a reduction)
  if (quant_e != QEFFORT_CONFLICT)
  {
    return;
  }
  Trace("quant-dsplit") << "QuantDSplit::check" << std::endl;
  NodeManager* nm = NodeManager::currentNM();
  FirstOrderModel* m = d_treg.getModel();
  std::vector<Node> lemmas;
  for (std::map<Node, int>::iterator it = d_quant_to_reduce.begin();
       it != d_quant_to_reduce.end();
       ++it)
  {
    Node q = it->first;
    Trace("quant-dsplit") << "- Split quantifier " << q << std::endl;
    if (m->isQuantifierAsserted(q) && m->isQuantifierActive(q)
        && d_added_split.find(q) == d_added_split.end())
    {
      d_added_split.insert(q);
      std::vector<Node> bvs;
      for (unsigned i = 0, nvars = q[0].getNumChildren(); i < nvars; i++)
      {
        if (static_cast<int>(i) != it->second)
        {
          bvs.push_back(q[0][i]);
        }
      }
      std::vector<Node> disj;
      disj.push_back(q.negate());
      TNode svar = q[0][it->second];
      TypeNode tn = svar.getType();
      Assert(tn.isDatatype());
      std::vector<Node> cons;
      const DType& dt = tn.getDType();
      for (unsigned j = 0, ncons = dt.getNumConstructors(); j < ncons; j++)
      {
        std::vector<Node> vars;
        for (unsigned k = 0, nargs = dt[j].getNumArgs(); k < nargs; k++)
        {
          TypeNode tns = dt[j][k].getRangeType();
          Node v = nm->mkBoundVar(tns);
          vars.push_back(v);
        }
        std::vector<Node> bvs_cmb;
        bvs_cmb.insert(bvs_cmb.end(), bvs.begin(), bvs.end());
        bvs_cmb.insert(bvs_cmb.end(), vars.begin(), vars.end());
        vars.insert(vars.begin(), dt[j].getConstructor());
        Node c = nm->mkNode(kind::APPLY_CONSTRUCTOR, vars);
        TNode ct = c;
        Node body = q[1].substitute(svar, ct);
        if (!bvs_cmb.empty())
        {
          Node bvl = nm->mkNode(kind::BOUND_VAR_LIST, bvs_cmb);
          std::vector<Node> children;
          children.push_back(bvl);
          children.push_back(body);
          if (q.getNumChildren() == 3)
          {
            Node ipls = q[2].substitute(svar, ct);
            children.push_back(ipls);
          }
          body = nm->mkNode(kind::FORALL, children);
        }
        cons.push_back(body);
      }
      Node conc = cons.size() == 1 ? cons[0] : nm->mkNode(kind::AND, cons);
      disj.push_back(conc);
      lemmas.push_back(disj.size() == 1 ? disj[0] : nm->mkNode(kind::OR, disj));
    }
  }

  // add lemmas to quantifiers engine
  for (const Node& lem : lemmas)
  {
    Trace("quant-dsplit") << "QuantDSplit lemma : " << lem << std::endl;
    d_qim.addPendingLemma(lem, InferenceId::QUANTIFIERS_DSPLIT);
  }
  Trace("quant-dsplit") << "QuantDSplit::check finished" << std::endl;
}

}  // namespace quantifiers
}  // namespace theory
}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Andrew Reynolds, Mathias Preiner, Aina Niemetz
4		*
5		* This file is part of the cvc5 project.
6		*
7		* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
8		* in the top-level source directory and their institutional affiliations.
9		* All rights reserved. See the file COPYING in the top-level source
10		* directory for licensing information.
11		* ****************************************************************************
12		*
13		* Implementation of dynamic quantifiers splitting.
14		*/
15
16		#include "theory/quantifiers/quant_split.h"
17
18		#include "expr/dtype.h"
19		#include "expr/dtype_cons.h"
20		#include "theory/quantifiers/term_database.h"
21		#include "theory/quantifiers/first_order_model.h"
22		#include "options/quantifiers_options.h"
23
24		using namespace cvc5::kind;
25
26		namespace cvc5 {
27		namespace theory {
28		namespace quantifiers {
29
30	5418	QuantDSplit::QuantDSplit(QuantifiersState& qs,
31		QuantifiersInferenceManager& qim,
32		QuantifiersRegistry& qr,
33	5418	TermRegistry& tr)
34	5418	: QuantifiersModule(qs, qim, qr, tr), d_added_split(qs.getUserContext())
35		{
36	5418	}
37
38	11327	void QuantDSplit::checkOwnership(Node q)
39		{
40		// If q is non-standard (marked as sygus, quantifier elimination, etc.), then
41		// do no split it.
42	21944	QAttributes qa;
43	11327	QuantAttributes::computeQuantAttributes(q, qa);
44	11327	if (!qa.isStandard())
45		{
46	710	return;
47		}
48	10617	bool takeOwnership = false;
49	10617	bool doSplit = false;
50	10617	QuantifiersBoundInference& qbi = d_qreg.getQuantifiersBoundInference();
51	10617	Trace("quant-dsplit-debug") << "Check split quantified formula : " << q << std::endl;
52	34178	for( unsigned i=0; i<q[0].getNumChildren(); i++ ){
53	48930	TypeNode tn = q[0][i].getType();
54	25369	if( tn.isDatatype() ){
55	4626	bool isFinite = d_qstate.isFiniteType(tn);
56	4626	const DType& dt = tn.getDType();
57	4626	if (dt.isRecursiveSingleton(tn))
58		{
59		Trace("quant-dsplit-debug") << "Datatype " << dt.getName() << " is recursive singleton." << std::endl;
60		}
61		else
62		{
63	4626	if (options::quantDynamicSplit() == options::QuantDSplitMode::AGG)
64		{
65		// split if it is a finite datatype
66		doSplit = isFinite;
67		}
68	9252	else if (options::quantDynamicSplit()
69	4626	== options::QuantDSplitMode::DEFAULT)
70		{
71	4626	if (!qbi.isFiniteBound(q, q[0][i]))
72		{
73	4491	if (isFinite)
74		{
75		// split if goes from being unhandled -> handled by finite
76		// instantiation. An example is datatypes with uninterpreted sort
77		// fields which are "interpreted finite" but not "finite".
78	898	doSplit = true;
79		// we additionally take ownership of this formula, in other words,
80		// we mark it reduced.
81	898	takeOwnership = true;
82		}
83	3593	else if (dt.getNumConstructors() == 1 && !dt.isCodatatype())
84		{
85		// split if only one constructor
86	910	doSplit = true;
87		}
88		}
89		}
90	4626	if (doSplit)
91		{
92		// store the index to split
93	1808	d_quant_to_reduce[q] = i;
94	3616	Trace("quant-dsplit-debug")
95	3616	<< "Split at index " << i << " based on datatype " << dt.getName()
96	1808	<< std::endl;
97	1808	break;
98		}
99	5636	Trace("quant-dsplit-debug")
100	2818	<< "Do not split based on datatype " << dt.getName() << std::endl;
101		}
102		}
103		}
104
105	10617	if (takeOwnership)
106		{
107	898	Trace("quant-dsplit-debug") << "Will take ownership." << std::endl;
108	898	d_qreg.setOwner(q, this);
109		}
110		// Notice we may not take ownership in some cases, meaning that both the
111		// original quantified formula and the split one are generated. This may
112		// increase our ability to answer "unsat", since quantifier instantiation
113		// heuristics may be more effective for one or the other (see issues #993
114		// and 3481).
115		}
116
117		/* whether this module needs to check this round */
118	48070	bool QuantDSplit::needsCheck( Theory::Effort e ) {
119	48070	return e>=Theory::EFFORT_FULL && !d_quant_to_reduce.empty();
120		}
121
122	197	bool QuantDSplit::checkCompleteFor( Node q ) {
123		// true if we split q
124	197	return d_added_split.find( q )!=d_added_split.end();
125		}
126
127		/* Call during quantifier engine's check */
128	3457	void QuantDSplit::check(Theory::Effort e, QEffort quant_e)
129		{
130		//add lemmas ASAP (they are a reduction)
131	3457	if (quant_e != QEFFORT_CONFLICT)
132		{
133	2295	return;
134		}
135	1162	Trace("quant-dsplit") << "QuantDSplit::check" << std::endl;
136	1162	NodeManager* nm = NodeManager::currentNM();
137	1162	FirstOrderModel* m = d_treg.getModel();
138	2324	std::vector<Node> lemmas;
139	28982	for (std::map<Node, int>::iterator it = d_quant_to_reduce.begin();
140	28982	it != d_quant_to_reduce.end();
141		++it)
142		{
143	55640	Node q = it->first;
144	27820	Trace("quant-dsplit") << "- Split quantifier " << q << std::endl;
145	110747	if (m->isQuantifierAsserted(q) && m->isQuantifierActive(q)
146	110747	&& d_added_split.find(q) == d_added_split.end())
147		{
148	1800	d_added_split.insert(q);
149	3600	std::vector<Node> bvs;
150	7518	for (unsigned i = 0, nvars = q[0].getNumChildren(); i < nvars; i++)
151		{
152	5718	if (static_cast<int>(i) != it->second)
153		{
154	3918	bvs.push_back(q[0][i]);
155		}
156		}
157	3600	std::vector<Node> disj;
158	1800	disj.push_back(q.negate());
159	3600	TNode svar = q[0][it->second];
160	3600	TypeNode tn = svar.getType();
161	1800	Assert(tn.isDatatype());
162	3600	std::vector<Node> cons;
163	1800	const DType& dt = tn.getDType();
164	4265	for (unsigned j = 0, ncons = dt.getNumConstructors(); j < ncons; j++)
165		{
166	4930	std::vector<Node> vars;
167	6055	for (unsigned k = 0, nargs = dt[j].getNumArgs(); k < nargs; k++)
168		{
169	7180	TypeNode tns = dt[j][k].getRangeType();
170	7180	Node v = nm->mkBoundVar(tns);
171	3590	vars.push_back(v);
172		}
173	4930	std::vector<Node> bvs_cmb;
174	2465	bvs_cmb.insert(bvs_cmb.end(), bvs.begin(), bvs.end());
175	2465	bvs_cmb.insert(bvs_cmb.end(), vars.begin(), vars.end());
176	2465	vars.insert(vars.begin(), dt[j].getConstructor());
177	4930	Node c = nm->mkNode(kind::APPLY_CONSTRUCTOR, vars);
178	4930	TNode ct = c;
179	4930	Node body = q[1].substitute(svar, ct);
180	2465	if (!bvs_cmb.empty())
181		{
182	4922	Node bvl = nm->mkNode(kind::BOUND_VAR_LIST, bvs_cmb);
183	4922	std::vector<Node> children;
184	2461	children.push_back(bvl);
185	2461	children.push_back(body);
186	2461	if (q.getNumChildren() == 3)
187		{
188	1782	Node ipls = q[2].substitute(svar, ct);
189	891	children.push_back(ipls);
190		}
191	2461	body = nm->mkNode(kind::FORALL, children);
192		}
193	2465	cons.push_back(body);
194		}
195	3600	Node conc = cons.size() == 1 ? cons[0] : nm->mkNode(kind::AND, cons);
196	1800	disj.push_back(conc);
197	1800	lemmas.push_back(disj.size() == 1 ? disj[0] : nm->mkNode(kind::OR, disj));
198		}
199		}
200
201		// add lemmas to quantifiers engine
202	2962	for (const Node& lem : lemmas)
203		{
204	1800	Trace("quant-dsplit") << "QuantDSplit lemma : " << lem << std::endl;
205	1800	d_qim.addPendingLemma(lem, InferenceId::QUANTIFIERS_DSPLIT);
206		}
207	1162	Trace("quant-dsplit") << "QuantDSplit::check finished" << std::endl;
208		}
209
210		} // namespace quantifiers
211		} // namespace theory
212	29358	} // namespace cvc5