Head

GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/theory/bv/theory_bv.cpp	Lines:	183	185	98.9 %
Date:	2021-09-19	Branches:	304	617	49.3 %


/******************************************************************************
 * Top contributors (to current version):
 *   Mathias Preiner, Andrew Reynolds, Haniel Barbosa
 *
 * 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.
 * ****************************************************************************
 *
 * Theory of bit-vectors.
 */

#include "theory/bv/theory_bv.h"

#include "options/bv_options.h"
#include "options/smt_options.h"
#include "proof/proof_checker.h"
#include "smt/smt_statistics_registry.h"
#include "theory/bv/bv_solver_bitblast.h"
#include "theory/bv/bv_solver_bitblast_internal.h"
#include "theory/bv/bv_solver_layered.h"
#include "theory/bv/theory_bv_utils.h"
#include "theory/ee_setup_info.h"
#include "theory/trust_substitutions.h"

namespace cvc5 {
namespace theory {
namespace bv {

TheoryBV::TheoryBV(Env& env,
                   OutputChannel& out,
                   Valuation valuation,
                   std::string name)
    : Theory(THEORY_BV, env, out, valuation, name),
      d_internal(nullptr),
      d_rewriter(),
      d_state(env, valuation),
      d_im(env, *this, d_state, nullptr, "theory::bv::"),
      d_notify(d_im),
      d_invalidateModelCache(context(), true),
      d_stats(statisticsRegistry(), "theory::bv::")
{
  switch (options().bv.bvSolver)
  {
    case options::BVSolver::BITBLAST:
      d_internal.reset(new BVSolverBitblast(env, &d_state, d_im, d_pnm));
      break;

    case options::BVSolver::LAYERED:
      d_internal.reset(new BVSolverLayered(
          env, *this, context(), userContext(), d_pnm, name));
      break;

    default:
      AlwaysAssert(options().bv.bvSolver == options::BVSolver::BITBLAST_INTERNAL);
      d_internal.reset(
          new BVSolverBitblastInternal(d_env, &d_state, d_im, d_pnm));
  }
  d_theoryState = &d_state;
  d_inferManager = &d_im;
}

TheoryBV::~TheoryBV() {}

TheoryRewriter* TheoryBV::getTheoryRewriter() { return &d_rewriter; }

ProofRuleChecker* TheoryBV::getProofChecker()
{
  if (options().bv.bvSolver == options::BVSolver::BITBLAST_INTERNAL)
  {
    return static_cast<BVSolverBitblastInternal*>(d_internal.get())
        ->getProofChecker();
  }
  return nullptr;
}

bool TheoryBV::needsEqualityEngine(EeSetupInfo& esi)
{
  bool need_ee = d_internal->needsEqualityEngine(esi);

  /* Set up default notify class for equality engine. */
  if (need_ee && esi.d_notify == nullptr)
  {
    esi.d_notify = &d_notify;
    esi.d_name = "theory::bv::ee";
  }

  return need_ee;
}

void TheoryBV::finishInit()
{
  // these kinds are semi-evaluated in getModelValue (applications of this
  // kind are treated as variables)
  getValuation().setSemiEvaluatedKind(kind::BITVECTOR_ACKERMANNIZE_UDIV);
  getValuation().setSemiEvaluatedKind(kind::BITVECTOR_ACKERMANNIZE_UREM);
  d_internal->finishInit();

  eq::EqualityEngine* ee = getEqualityEngine();
  if (ee)
  {
    // The kinds we are treating as function application in congruence
    ee->addFunctionKind(kind::BITVECTOR_CONCAT, true);
    //    ee->addFunctionKind(kind::BITVECTOR_AND);
    //    ee->addFunctionKind(kind::BITVECTOR_OR);
    //    ee->addFunctionKind(kind::BITVECTOR_XOR);
    //    ee->addFunctionKind(kind::BITVECTOR_NOT);
    //    ee->addFunctionKind(kind::BITVECTOR_NAND);
    //    ee->addFunctionKind(kind::BITVECTOR_NOR);
    //    ee->addFunctionKind(kind::BITVECTOR_XNOR);
    //    ee->addFunctionKind(kind::BITVECTOR_COMP);
    ee->addFunctionKind(kind::BITVECTOR_MULT, true);
    ee->addFunctionKind(kind::BITVECTOR_ADD, true);
    ee->addFunctionKind(kind::BITVECTOR_EXTRACT, true);
    //    ee->addFunctionKind(kind::BITVECTOR_SUB);
    //    ee->addFunctionKind(kind::BITVECTOR_NEG);
    //    ee->addFunctionKind(kind::BITVECTOR_UDIV);
    //    ee->addFunctionKind(kind::BITVECTOR_UREM);
    //    ee->addFunctionKind(kind::BITVECTOR_SDIV);
    //    ee->addFunctionKind(kind::BITVECTOR_SREM);
    //    ee->addFunctionKind(kind::BITVECTOR_SMOD);
    //    ee->addFunctionKind(kind::BITVECTOR_SHL);
    //    ee->addFunctionKind(kind::BITVECTOR_LSHR);
    //    ee->addFunctionKind(kind::BITVECTOR_ASHR);
    //    ee->addFunctionKind(kind::BITVECTOR_ULT);
    //    ee->addFunctionKind(kind::BITVECTOR_ULE);
    //    ee->addFunctionKind(kind::BITVECTOR_UGT);
    //    ee->addFunctionKind(kind::BITVECTOR_UGE);
    //    ee->addFunctionKind(kind::BITVECTOR_SLT);
    //    ee->addFunctionKind(kind::BITVECTOR_SLE);
    //    ee->addFunctionKind(kind::BITVECTOR_SGT);
    //    ee->addFunctionKind(kind::BITVECTOR_SGE);
    ee->addFunctionKind(kind::BITVECTOR_TO_NAT);
    ee->addFunctionKind(kind::INT_TO_BITVECTOR);
  }
}

void TheoryBV::preRegisterTerm(TNode node)
{
  d_internal->preRegisterTerm(node);

  eq::EqualityEngine* ee = getEqualityEngine();
  if (ee)
  {
    if (node.getKind() == kind::EQUAL)
    {
      ee->addTriggerPredicate(node);
    }
    else
    {
      ee->addTerm(node);
    }
  }
}

bool TheoryBV::preCheck(Effort e) { return d_internal->preCheck(e); }

void TheoryBV::postCheck(Effort e)
{
  d_invalidateModelCache = true;
  d_internal->postCheck(e);
}

bool TheoryBV::preNotifyFact(
    TNode atom, bool pol, TNode fact, bool isPrereg, bool isInternal)
{
  return d_internal->preNotifyFact(atom, pol, fact, isPrereg, isInternal);
}

void TheoryBV::notifyFact(TNode atom, bool pol, TNode fact, bool isInternal)
{
  d_internal->notifyFact(atom, pol, fact, isInternal);
}

bool TheoryBV::needsCheckLastEffort()
{
  return d_internal->needsCheckLastEffort();
}

void TheoryBV::computeRelevantTerms(std::set<Node>& termSet)
{
  return d_internal->computeRelevantTerms(termSet);
}

bool TheoryBV::collectModelValues(TheoryModel* m, const std::set<Node>& termSet)
{
  return d_internal->collectModelValues(m, termSet);
}

void TheoryBV::propagate(Effort e) { return d_internal->propagate(e); }

Theory::PPAssertStatus TheoryBV::ppAssert(
    TrustNode tin, TrustSubstitutionMap& outSubstitutions)
{
  TNode in = tin.getNode();
  Kind k = in.getKind();
  if (k == kind::EQUAL)
  {
    // Substitute variables
    if (in[0].isVar() && isLegalElimination(in[0], in[1]))
    {
      ++d_stats.d_solveSubstitutions;
      outSubstitutions.addSubstitutionSolved(in[0], in[1], tin);
      return Theory::PP_ASSERT_STATUS_SOLVED;
    }
    if (in[1].isVar() && isLegalElimination(in[1], in[0]))
    {
      ++d_stats.d_solveSubstitutions;
      outSubstitutions.addSubstitutionSolved(in[1], in[0], tin);
      return Theory::PP_ASSERT_STATUS_SOLVED;
    }
    /**
     * Eliminate extract over bit-vector variables.
     *
     * Given x[h:l] = c, where c is a constant and x is a variable.
     *
     * We rewrite to:
     *
     * x = sk1::c       if l == 0, where bw(sk1) = bw(x)-1-h
     * x = c::sk2       if h == bw(x)-1, where bw(sk2) = l
     * x = sk1::c::sk2  otherwise, where bw(sk1) = bw(x)-1-h and bw(sk2) = l
     */
    Node node = rewrite(in);
    if ((node[0].getKind() == kind::BITVECTOR_EXTRACT && node[1].isConst())
        || (node[1].getKind() == kind::BITVECTOR_EXTRACT
            && node[0].isConst()))
    {
      Node extract = node[0].isConst() ? node[1] : node[0];
      if (extract[0].isVar())
      {
        Node c = node[0].isConst() ? node[0] : node[1];

        uint32_t high = utils::getExtractHigh(extract);
        uint32_t low = utils::getExtractLow(extract);
        uint32_t var_bw = utils::getSize(extract[0]);
        std::vector<Node> children;

        // create sk1 with size bw(x)-1-h
        if (low == 0 || high != var_bw - 1)
        {
          Assert(high != var_bw - 1);
          uint32_t skolem_size = var_bw - high - 1;
          Node skolem = utils::mkVar(skolem_size);
          children.push_back(skolem);
        }

        children.push_back(c);

        // create sk2 with size l
        if (high == var_bw - 1 || low != 0)
        {
          Assert(low != 0);
          uint32_t skolem_size = low;
          Node skolem = utils::mkVar(skolem_size);
          children.push_back(skolem);
        }

        Node concat = utils::mkConcat(children);
        Assert(utils::getSize(concat) == utils::getSize(extract[0]));
        if (isLegalElimination(extract[0], concat))
        {
          outSubstitutions.addSubstitutionSolved(extract[0], concat, tin);
          return Theory::PP_ASSERT_STATUS_SOLVED;
        }
      }
    }
  }
  return Theory::PP_ASSERT_STATUS_UNSOLVED;
}

TrustNode TheoryBV::ppRewrite(TNode t, std::vector<SkolemLemma>& lems)
{
  // first, see if we need to expand definitions
  TrustNode texp = d_rewriter.expandDefinition(t);
  if (!texp.isNull())
  {
    return texp;
  }
  return d_internal->ppRewrite(t);
}

void TheoryBV::presolve() { d_internal->presolve(); }

EqualityStatus TheoryBV::getEqualityStatus(TNode a, TNode b)
{
  EqualityStatus status = d_internal->getEqualityStatus(a, b);

  if (status == EqualityStatus::EQUALITY_UNKNOWN)
  {
    Node value_a = getValue(a);
    Node value_b = getValue(b);

    if (value_a.isNull() || value_b.isNull())
    {
      return status;
    }

    if (value_a == value_b)
    {
      Debug("theory-bv") << EQUALITY_TRUE_IN_MODEL << std::endl;
      return EQUALITY_TRUE_IN_MODEL;
    }
    Debug("theory-bv") << EQUALITY_FALSE_IN_MODEL << std::endl;
    return EQUALITY_FALSE_IN_MODEL;
  }
  return status;
}

TrustNode TheoryBV::explain(TNode node) { return d_internal->explain(node); }

void TheoryBV::notifySharedTerm(TNode t)
{
  d_internal->notifySharedTerm(t);
}

void TheoryBV::ppStaticLearn(TNode in, NodeBuilder& learned)
{
  d_internal->ppStaticLearn(in, learned);
}

bool TheoryBV::applyAbstraction(const std::vector<Node>& assertions,
                                std::vector<Node>& new_assertions)
{
  return d_internal->applyAbstraction(assertions, new_assertions);
}

Node TheoryBV::getValue(TNode node)
{
  if (d_invalidateModelCache.get())
  {
    d_modelCache.clear();
  }
  d_invalidateModelCache.set(false);

  std::vector<TNode> visit;

  TNode cur;
  visit.push_back(node);
  do
  {
    cur = visit.back();
    visit.pop_back();

    auto it = d_modelCache.find(cur);
    if (it != d_modelCache.end() && !it->second.isNull())
    {
      continue;
    }

    if (cur.isConst())
    {
      d_modelCache[cur] = cur;
      continue;
    }

    Node value = d_internal->getValue(cur, false);
    if (value.isConst())
    {
      d_modelCache[cur] = value;
      continue;
    }

    if (Theory::isLeafOf(cur, theory::THEORY_BV))
    {
      value = d_internal->getValue(cur, true);
      d_modelCache[cur] = value;
      continue;
    }

    if (it == d_modelCache.end())
    {
      visit.push_back(cur);
      d_modelCache.emplace(cur, Node());
      visit.insert(visit.end(), cur.begin(), cur.end());
    }
    else if (it->second.isNull())
    {
      NodeBuilder nb(cur.getKind());
      if (cur.getMetaKind() == kind::metakind::PARAMETERIZED)
      {
        nb << cur.getOperator();
      }

      std::unordered_map<Node, Node>::iterator iit;
      for (const TNode& child : cur)
      {
        iit = d_modelCache.find(child);
        Assert(iit != d_modelCache.end());
        Assert(iit->second.isConst());
        nb << iit->second;
      }
      it->second = rewrite(nb.constructNode());
    }
  } while (!visit.empty());

  auto it = d_modelCache.find(node);
  Assert(it != d_modelCache.end());
  return it->second;
}

TheoryBV::Statistics::Statistics(StatisticsRegistry& reg,
                                 const std::string& name)
    : d_solveSubstitutions(reg.registerInt(name + "NumSolveSubstitutions"))
{
}

}  // namespace bv
}  // namespace theory
}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Mathias Preiner, Andrew Reynolds, Haniel Barbosa
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		* Theory of bit-vectors.
14		*/
15
16		#include "theory/bv/theory_bv.h"
17
18		#include "options/bv_options.h"
19		#include "options/smt_options.h"
20		#include "proof/proof_checker.h"
21		#include "smt/smt_statistics_registry.h"
22		#include "theory/bv/bv_solver_bitblast.h"
23		#include "theory/bv/bv_solver_bitblast_internal.h"
24		#include "theory/bv/bv_solver_layered.h"
25		#include "theory/bv/theory_bv_utils.h"
26		#include "theory/ee_setup_info.h"
27		#include "theory/trust_substitutions.h"
28
29		namespace cvc5 {
30		namespace theory {
31		namespace bv {
32
33	9942	TheoryBV::TheoryBV(Env& env,
34		OutputChannel& out,
35		Valuation valuation,
36	9942	std::string name)
37		: Theory(THEORY_BV, env, out, valuation, name),
38		d_internal(nullptr),
39		d_rewriter(),
40		d_state(env, valuation),
41		d_im(env, *this, d_state, nullptr, "theory::bv::"),
42		d_notify(d_im),
43		d_invalidateModelCache(context(), true),
44	9942	d_stats(statisticsRegistry(), "theory::bv::")
45		{
46	9942	switch (options().bv.bvSolver)
47		{
48	6160	case options::BVSolver::BITBLAST:
49	6160	d_internal.reset(new BVSolverBitblast(env, &d_state, d_im, d_pnm));
50	6160	break;
51
52	4	case options::BVSolver::LAYERED:
53	12	d_internal.reset(new BVSolverLayered(
54	8	env, *this, context(), userContext(), d_pnm, name));
55	4	break;
56
57	3778	default:
58	3778	AlwaysAssert(options().bv.bvSolver == options::BVSolver::BITBLAST_INTERNAL);
59	7556	d_internal.reset(
60	3778	new BVSolverBitblastInternal(d_env, &d_state, d_im, d_pnm));
61		}
62	9942	d_theoryState = &d_state;
63	9942	d_inferManager = &d_im;
64	9942	}
65
66	19878	TheoryBV::~TheoryBV() {}
67
68	9942	TheoryRewriter* TheoryBV::getTheoryRewriter() { return &d_rewriter; }
69
70	3796	ProofRuleChecker* TheoryBV::getProofChecker()
71		{
72	3796	if (options().bv.bvSolver == options::BVSolver::BITBLAST_INTERNAL)
73		{
74	3764	return static_cast<BVSolverBitblastInternal*>(d_internal.get())
75	3764	->getProofChecker();
76		}
77	32	return nullptr;
78		}
79
80	9942	bool TheoryBV::needsEqualityEngine(EeSetupInfo& esi)
81		{
82	9942	bool need_ee = d_internal->needsEqualityEngine(esi);
83
84		/* Set up default notify class for equality engine. */
85	9942	if (need_ee && esi.d_notify == nullptr)
86		{
87	9938	esi.d_notify = &d_notify;
88	9938	esi.d_name = "theory::bv::ee";
89		}
90
91	9942	return need_ee;
92		}
93
94	9942	void TheoryBV::finishInit()
95		{
96		// these kinds are semi-evaluated in getModelValue (applications of this
97		// kind are treated as variables)
98	9942	getValuation().setSemiEvaluatedKind(kind::BITVECTOR_ACKERMANNIZE_UDIV);
99	9942	getValuation().setSemiEvaluatedKind(kind::BITVECTOR_ACKERMANNIZE_UREM);
100	9942	d_internal->finishInit();
101
102	9942	eq::EqualityEngine* ee = getEqualityEngine();
103	9942	if (ee)
104		{
105		// The kinds we are treating as function application in congruence
106	9940	ee->addFunctionKind(kind::BITVECTOR_CONCAT, true);
107		// ee->addFunctionKind(kind::BITVECTOR_AND);
108		// ee->addFunctionKind(kind::BITVECTOR_OR);
109		// ee->addFunctionKind(kind::BITVECTOR_XOR);
110		// ee->addFunctionKind(kind::BITVECTOR_NOT);
111		// ee->addFunctionKind(kind::BITVECTOR_NAND);
112		// ee->addFunctionKind(kind::BITVECTOR_NOR);
113		// ee->addFunctionKind(kind::BITVECTOR_XNOR);
114		// ee->addFunctionKind(kind::BITVECTOR_COMP);
115	9940	ee->addFunctionKind(kind::BITVECTOR_MULT, true);
116	9940	ee->addFunctionKind(kind::BITVECTOR_ADD, true);
117	9940	ee->addFunctionKind(kind::BITVECTOR_EXTRACT, true);
118		// ee->addFunctionKind(kind::BITVECTOR_SUB);
119		// ee->addFunctionKind(kind::BITVECTOR_NEG);
120		// ee->addFunctionKind(kind::BITVECTOR_UDIV);
121		// ee->addFunctionKind(kind::BITVECTOR_UREM);
122		// ee->addFunctionKind(kind::BITVECTOR_SDIV);
123		// ee->addFunctionKind(kind::BITVECTOR_SREM);
124		// ee->addFunctionKind(kind::BITVECTOR_SMOD);
125		// ee->addFunctionKind(kind::BITVECTOR_SHL);
126		// ee->addFunctionKind(kind::BITVECTOR_LSHR);
127		// ee->addFunctionKind(kind::BITVECTOR_ASHR);
128		// ee->addFunctionKind(kind::BITVECTOR_ULT);
129		// ee->addFunctionKind(kind::BITVECTOR_ULE);
130		// ee->addFunctionKind(kind::BITVECTOR_UGT);
131		// ee->addFunctionKind(kind::BITVECTOR_UGE);
132		// ee->addFunctionKind(kind::BITVECTOR_SLT);
133		// ee->addFunctionKind(kind::BITVECTOR_SLE);
134		// ee->addFunctionKind(kind::BITVECTOR_SGT);
135		// ee->addFunctionKind(kind::BITVECTOR_SGE);
136	9940	ee->addFunctionKind(kind::BITVECTOR_TO_NAT);
137	9940	ee->addFunctionKind(kind::INT_TO_BITVECTOR);
138		}
139	9942	}
140
141	326831	void TheoryBV::preRegisterTerm(TNode node)
142		{
143	326831	d_internal->preRegisterTerm(node);
144
145	326831	eq::EqualityEngine* ee = getEqualityEngine();
146	326831	if (ee)
147		{
148	326831	if (node.getKind() == kind::EQUAL)
149		{
150	51149	ee->addTriggerPredicate(node);
151		}
152		else
153		{
154	275682	ee->addTerm(node);
155		}
156		}
157	326831	}
158
159	933055	bool TheoryBV::preCheck(Effort e) { return d_internal->preCheck(e); }
160
161	933055	void TheoryBV::postCheck(Effort e)
162		{
163	933055	d_invalidateModelCache = true;
164	933055	d_internal->postCheck(e);
165	933055	}
166
167	2694300	bool TheoryBV::preNotifyFact(
168		TNode atom, bool pol, TNode fact, bool isPrereg, bool isInternal)
169		{
170	2694300	return d_internal->preNotifyFact(atom, pol, fact, isPrereg, isInternal);
171		}
172
173	2694300	void TheoryBV::notifyFact(TNode atom, bool pol, TNode fact, bool isInternal)
174		{
175	2694300	d_internal->notifyFact(atom, pol, fact, isInternal);
176	2694300	}
177
178	8916	bool TheoryBV::needsCheckLastEffort()
179		{
180	8916	return d_internal->needsCheckLastEffort();
181		}
182
183	7570	void TheoryBV::computeRelevantTerms(std::set<Node>& termSet)
184		{
185	7570	return d_internal->computeRelevantTerms(termSet);
186		}
187
188	7570	bool TheoryBV::collectModelValues(TheoryModel* m, const std::set<Node>& termSet)
189		{
190	7570	return d_internal->collectModelValues(m, termSet);
191		}
192
193	1495298	void TheoryBV::propagate(Effort e) { return d_internal->propagate(e); }
194
195	4499	Theory::PPAssertStatus TheoryBV::ppAssert(
196		TrustNode tin, TrustSubstitutionMap& outSubstitutions)
197		{
198	8998	TNode in = tin.getNode();
199	4499	Kind k = in.getKind();
200	4499	if (k == kind::EQUAL)
201		{
202		// Substitute variables
203	1273	if (in[0].isVar() && isLegalElimination(in[0], in[1]))
204		{
205	282	++d_stats.d_solveSubstitutions;
206	282	outSubstitutions.addSubstitutionSolved(in[0], in[1], tin);
207	1114	return Theory::PP_ASSERT_STATUS_SOLVED;
208		}
209	991	if (in[1].isVar() && isLegalElimination(in[1], in[0]))
210		{
211	522	++d_stats.d_solveSubstitutions;
212	522	outSubstitutions.addSubstitutionSolved(in[1], in[0], tin);
213	522	return Theory::PP_ASSERT_STATUS_SOLVED;
214		}
215		/**
216		* Eliminate extract over bit-vector variables.
217		*
218		* Given x[h:l] = c, where c is a constant and x is a variable.
219		*
220		* We rewrite to:
221		*
222		* x = sk1::c if l == 0, where bw(sk1) = bw(x)-1-h
223		* x = c::sk2 if h == bw(x)-1, where bw(sk2) = l
224		* x = sk1::c::sk2 otherwise, where bw(sk1) = bw(x)-1-h and bw(sk2) = l
225		*/
226	910	Node node = rewrite(in);
227	1466	if ((node[0].getKind() == kind::BITVECTOR_EXTRACT && node[1].isConst())
228	2367	\|\| (node[1].getKind() == kind::BITVECTOR_EXTRACT
229	536	&& node[0].isConst()))
230		{
231	68	Node extract = node[0].isConst() ? node[1] : node[0];
232	48	if (extract[0].isVar())
233		{
234	28	Node c = node[0].isConst() ? node[0] : node[1];
235
236	28	uint32_t high = utils::getExtractHigh(extract);
237	28	uint32_t low = utils::getExtractLow(extract);
238	28	uint32_t var_bw = utils::getSize(extract[0]);
239	28	std::vector<Node> children;
240
241		// create sk1 with size bw(x)-1-h
242	28	if (low == 0 \|\| high != var_bw - 1)
243		{
244	24	Assert(high != var_bw - 1);
245	24	uint32_t skolem_size = var_bw - high - 1;
246	48	Node skolem = utils::mkVar(skolem_size);
247	24	children.push_back(skolem);
248		}
249
250	28	children.push_back(c);
251
252		// create sk2 with size l
253	28	if (high == var_bw - 1 \|\| low != 0)
254		{
255	6	Assert(low != 0);
256	6	uint32_t skolem_size = low;
257	12	Node skolem = utils::mkVar(skolem_size);
258	6	children.push_back(skolem);
259		}
260
261	28	Node concat = utils::mkConcat(children);
262	28	Assert(utils::getSize(concat) == utils::getSize(extract[0]));
263	28	if (isLegalElimination(extract[0], concat))
264		{
265	28	outSubstitutions.addSubstitutionSolved(extract[0], concat, tin);
266	28	return Theory::PP_ASSERT_STATUS_SOLVED;
267		}
268		}
269		}
270		}
271	3667	return Theory::PP_ASSERT_STATUS_UNSOLVED;
272		}
273
274	408746	TrustNode TheoryBV::ppRewrite(TNode t, std::vector<SkolemLemma>& lems)
275		{
276		// first, see if we need to expand definitions
277	817492	TrustNode texp = d_rewriter.expandDefinition(t);
278	408746	if (!texp.isNull())
279		{
280	96	return texp;
281		}
282	408650	return d_internal->ppRewrite(t);
283		}
284
285	15264	void TheoryBV::presolve() { d_internal->presolve(); }
286
287	28965	EqualityStatus TheoryBV::getEqualityStatus(TNode a, TNode b)
288		{
289	28965	EqualityStatus status = d_internal->getEqualityStatus(a, b);
290
291	28965	if (status == EqualityStatus::EQUALITY_UNKNOWN)
292		{
293	57930	Node value_a = getValue(a);
294	57930	Node value_b = getValue(b);
295
296	28965	if (value_a.isNull() \|\| value_b.isNull())
297		{
298		return status;
299		}
300
301	28965	if (value_a == value_b)
302		{
303	4172	Debug("theory-bv") << EQUALITY_TRUE_IN_MODEL << std::endl;
304	4172	return EQUALITY_TRUE_IN_MODEL;
305		}
306	24793	Debug("theory-bv") << EQUALITY_FALSE_IN_MODEL << std::endl;
307	24793	return EQUALITY_FALSE_IN_MODEL;
308		}
309		return status;
310		}
311
312	4990	TrustNode TheoryBV::explain(TNode node) { return d_internal->explain(node); }
313
314	92195	void TheoryBV::notifySharedTerm(TNode t)
315		{
316	92195	d_internal->notifySharedTerm(t);
317	92195	}
318
319	105462	void TheoryBV::ppStaticLearn(TNode in, NodeBuilder& learned)
320		{
321	105462	d_internal->ppStaticLearn(in, learned);
322	105462	}
323
324	4	bool TheoryBV::applyAbstraction(const std::vector<Node>& assertions,
325		std::vector<Node>& new_assertions)
326		{
327	4	return d_internal->applyAbstraction(assertions, new_assertions);
328		}
329
330	57930	Node TheoryBV::getValue(TNode node)
331		{
332	57930	if (d_invalidateModelCache.get())
333		{
334	248	d_modelCache.clear();
335		}
336	57930	d_invalidateModelCache.set(false);
337
338	115860	std::vector<TNode> visit;
339
340	115860	TNode cur;
341	57930	visit.push_back(node);
342	561	do
343		{
344	58491	cur = visit.back();
345	58491	visit.pop_back();
346
347	58491	auto it = d_modelCache.find(cur);
348	58491	if (it != d_modelCache.end() && !it->second.isNull())
349		{
350	115107	continue;
351		}
352
353	1722	if (cur.isConst())
354		{
355	281	d_modelCache[cur] = cur;
356	281	continue;
357		}
358
359	1594	Node value = d_internal->getValue(cur, false);
360	1639	if (value.isConst())
361		{
362	479	d_modelCache[cur] = value;
363	479	continue;
364		}
365
366	928	if (Theory::isLeafOf(cur, theory::THEORY_BV))
367		{
368	247	value = d_internal->getValue(cur, true);
369	247	d_modelCache[cur] = value;
370	247	continue;
371		}
372
373	434	if (it == d_modelCache.end())
374		{
375	217	visit.push_back(cur);
376	217	d_modelCache.emplace(cur, Node());
377	217	visit.insert(visit.end(), cur.begin(), cur.end());
378		}
379	217	else if (it->second.isNull())
380		{
381	434	NodeBuilder nb(cur.getKind());
382	217	if (cur.getMetaKind() == kind::metakind::PARAMETERIZED)
383		{
384	29	nb << cur.getOperator();
385		}
386
387	217	std::unordered_map<Node, Node>::iterator iit;
388	561	for (const TNode& child : cur)
389		{
390	344	iit = d_modelCache.find(child);
391	344	Assert(iit != d_modelCache.end());
392	344	Assert(iit->second.isConst());
393	344	nb << iit->second;
394		}
395	217	it->second = rewrite(nb.constructNode());
396		}
397	58491	} while (!visit.empty());
398
399	57930	auto it = d_modelCache.find(node);
400	57930	Assert(it != d_modelCache.end());
401	115860	return it->second;
402		}
403
404	9942	TheoryBV::Statistics::Statistics(StatisticsRegistry& reg,
405	9942	const std::string& name)
406	9942	: d_solveSubstitutions(reg.registerInt(name + "NumSolveSubstitutions"))
407		{
408	9942	}
409
410		} // namespace bv
411		} // namespace theory
412	29577	} // namespace cvc5