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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/theory/bv/bv_solver_bitblast.cpp	Lines:	157	165	95.2 %
Date:	2021-11-05	Branches:	292	606	48.2 %


/******************************************************************************
 * Top contributors (to current version):
 *   Mathias Preiner, Gereon Kremer, Andres Noetzli
 *
 * 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.
 * ****************************************************************************
 *
 * Bit-blasting solver that supports multiple SAT backends.
 */

#include "theory/bv/bv_solver_bitblast.h"

#include "options/bv_options.h"
#include "prop/sat_solver_factory.h"
#include "smt/smt_statistics_registry.h"
#include "theory/bv/theory_bv.h"
#include "theory/bv/theory_bv_utils.h"
#include "theory/theory_model.h"

namespace cvc5 {
namespace theory {
namespace bv {

/**
 * Notifies the BV solver when assertions were reset.
 *
 * This class is notified after every user-context pop and maintains a flag
 * that indicates whether assertions have been reset. If the user-context level
 * reaches level 0 it means that the assertions were reset.
 */
class NotifyResetAssertions : public context::ContextNotifyObj
{
 public:
  NotifyResetAssertions(context::Context* c)
      : context::ContextNotifyObj(c, false),
        d_context(c),
        d_doneResetAssertions(false)
  {
  }

  bool doneResetAssertions() { return d_doneResetAssertions; }

  void reset() { d_doneResetAssertions = false; }

 protected:
  void contextNotifyPop() override
  {
    // If the user-context level reaches 0 it means that reset-assertions was
    // called.
    if (d_context->getLevel() == 0)
    {
      d_doneResetAssertions = true;
    }
  }

 private:
  /** The user-context. */
  context::Context* d_context;

  /** Flag to notify whether reset assertions was called. */
  bool d_doneResetAssertions;
};

/**
 * Bit-blasting registrar.
 *
 * The CnfStream calls preRegister() if it encounters a theory atom.
 * This registrar bit-blasts given atom and remembers which bit-vector atoms
 * were bit-blasted.
 *
 * This registrar is needed when --bitblast=eager is enabled.
 */
class BBRegistrar : public prop::Registrar
{
 public:
  BBRegistrar(NodeBitblaster* bb) : d_bitblaster(bb) {}

  void preRegister(Node n) override
  {
    if (d_registeredAtoms.find(n) != d_registeredAtoms.end())
    {
      return;
    }
    /* We are only interested in bit-vector atoms. */
    if ((n.getKind() == kind::EQUAL && n[0].getType().isBitVector())
        || n.getKind() == kind::BITVECTOR_ULT
        || n.getKind() == kind::BITVECTOR_ULE
        || n.getKind() == kind::BITVECTOR_SLT
        || n.getKind() == kind::BITVECTOR_SLE)
    {
      d_registeredAtoms.insert(n);
      d_bitblaster->bbAtom(n);
    }
  }

  std::unordered_set<TNode>& getRegisteredAtoms() { return d_registeredAtoms; }

 private:
  /** The bitblaster used. */
  NodeBitblaster* d_bitblaster;

  /** Stores bit-vector atoms encounterd on preRegister(). */
  std::unordered_set<TNode> d_registeredAtoms;
};

BVSolverBitblast::BVSolverBitblast(Env& env,
                                   TheoryState* s,
                                   TheoryInferenceManager& inferMgr,
                                   ProofNodeManager* pnm)
    : BVSolver(env, *s, inferMgr),
      d_bitblaster(new NodeBitblaster(env, s)),
      d_bbRegistrar(new BBRegistrar(d_bitblaster.get())),
      d_nullContext(new context::Context()),
      d_bbFacts(context()),
      d_bbInputFacts(context()),
      d_assumptions(context()),
      d_assertions(context()),
      d_epg(pnm ? new EagerProofGenerator(pnm, userContext(), "")
                : nullptr),
      d_factLiteralCache(context()),
      d_literalFactCache(context()),
      d_propagate(options().bv.bitvectorPropagate),
      d_resetNotify(new NotifyResetAssertions(userContext()))
{
  if (pnm != nullptr)
  {
    d_bvProofChecker.registerTo(pnm->getChecker());
  }

  initSatSolver();
}

void BVSolverBitblast::postCheck(Theory::Effort level)
{
  if (level != Theory::Effort::EFFORT_FULL)
  {
    /* Do bit-level propagation only if the SAT solver supports it. */
    if (!d_propagate || !d_satSolver->setPropagateOnly())
    {
      return;
    }
  }

  // If we permanently added assertions to the SAT solver and the assertions
  // were reset, we have to reset the SAT solver and the CNF stream.
  if (options().bv.bvAssertInput && d_resetNotify->doneResetAssertions())
  {
    d_satSolver.reset(nullptr);
    d_cnfStream.reset(nullptr);
    initSatSolver();
    d_resetNotify->reset();
  }

  NodeManager* nm = NodeManager::currentNM();

  /* Process input assertions bit-blast queue. */
  while (!d_bbInputFacts.empty())
  {
    Node fact = d_bbInputFacts.front();
    d_bbInputFacts.pop();
    /* Bit-blast fact and cache literal. */
    if (d_factLiteralCache.find(fact) == d_factLiteralCache.end())
    {
      if (fact.getKind() == kind::BITVECTOR_EAGER_ATOM)
      {
        handleEagerAtom(fact, true);
      }
      else
      {
        d_bitblaster->bbAtom(fact);
        Node bb_fact = d_bitblaster->getStoredBBAtom(fact);
        d_cnfStream->convertAndAssert(bb_fact, false, false);
      }
    }
    d_assertions.push_back(fact);
  }

  /* Process bit-blast queue and store SAT literals. */
  while (!d_bbFacts.empty())
  {
    Node fact = d_bbFacts.front();
    d_bbFacts.pop();
    /* Bit-blast fact and cache literal. */
    if (d_factLiteralCache.find(fact) == d_factLiteralCache.end())
    {
      prop::SatLiteral lit;
      if (fact.getKind() == kind::BITVECTOR_EAGER_ATOM)
      {
        handleEagerAtom(fact, false);
        lit = d_cnfStream->getLiteral(fact[0]);
      }
      else
      {
        d_bitblaster->bbAtom(fact);
        Node bb_fact = d_bitblaster->getStoredBBAtom(fact);
        d_cnfStream->ensureLiteral(bb_fact);
        lit = d_cnfStream->getLiteral(bb_fact);
      }
      d_factLiteralCache[fact] = lit;
      d_literalFactCache[lit] = fact;
    }
    d_assumptions.push_back(d_factLiteralCache[fact]);
  }

  std::vector<prop::SatLiteral> assumptions(d_assumptions.begin(),
                                            d_assumptions.end());
  prop::SatValue val = d_satSolver->solve(assumptions);

  if (val == prop::SatValue::SAT_VALUE_FALSE)
  {
    std::vector<prop::SatLiteral> unsat_assumptions;
    d_satSolver->getUnsatAssumptions(unsat_assumptions);

    Node conflict;
    // Unsat assumptions produce conflict.
    if (unsat_assumptions.size() > 0)
    {
      std::vector<Node> conf;
      for (const prop::SatLiteral& lit : unsat_assumptions)
      {
        conf.push_back(d_literalFactCache[lit]);
        Debug("bv-bitblast")
            << "unsat assumption (" << lit << "): " << conf.back() << std::endl;
      }
      conflict = nm->mkAnd(conf);
    }
    else  // Input assertions produce conflict.
    {
      std::vector<Node> assertions(d_assertions.begin(), d_assertions.end());
      conflict = nm->mkAnd(assertions);
    }
    d_im.conflict(conflict, InferenceId::BV_BITBLAST_CONFLICT);
  }
}

bool BVSolverBitblast::preNotifyFact(
    TNode atom, bool pol, TNode fact, bool isPrereg, bool isInternal)
{
  Valuation& val = d_state.getValuation();

  /**
   * Check whether `fact` is an input assertion on user-level 0.
   *
   * If this is the case we can assert `fact` to the SAT solver instead of
   * using assumptions.
   */
  if (options().bv.bvAssertInput && val.isSatLiteral(fact)
      && val.getDecisionLevel(fact) == 0 && val.getIntroLevel(fact) == 0)
  {
    Assert(!val.isDecision(fact));
    d_bbInputFacts.push_back(fact);
  }
  else
  {
    d_bbFacts.push_back(fact);
  }

  return false;  // Return false to enable equality engine reasoning in Theory.
}

TrustNode BVSolverBitblast::explain(TNode n)
{
  Debug("bv-bitblast") << "explain called on " << n << std::endl;
  return d_im.explainLit(n);
}

void BVSolverBitblast::computeRelevantTerms(std::set<Node>& termSet)
{
  /* BITVECTOR_EAGER_ATOM wraps input assertions that may also contain
   * equalities. As a result, these equalities are not handled by the equality
   * engine and terms below these equalities do not appear in `termSet`.
   * We need to make sure that we compute model values for all relevant terms
   * in BitblastMode::EAGER and therefore add all variables from the
   * bit-blaster to `termSet`.
   */
  if (options().bv.bitblastMode == options::BitblastMode::EAGER)
  {
    d_bitblaster->computeRelevantTerms(termSet);
  }
}

bool BVSolverBitblast::collectModelValues(TheoryModel* m,
                                          const std::set<Node>& termSet)
{
  for (const auto& term : termSet)
  {
    if (!d_bitblaster->isVariable(term))
    {
      continue;
    }

    Node value = getValue(term, true);
    Assert(value.isConst());
    if (!m->assertEquality(term, value, true))
    {
      return false;
    }
  }

  // In eager bitblast mode we also have to collect the model values for
  // Boolean variables in the CNF stream.
  if (options().bv.bitblastMode == options::BitblastMode::EAGER)
  {
    NodeManager* nm = NodeManager::currentNM();
    std::vector<TNode> vars;
    d_cnfStream->getBooleanVariables(vars);
    for (TNode var : vars)
    {
      Assert(d_cnfStream->hasLiteral(var));
      prop::SatLiteral bit = d_cnfStream->getLiteral(var);
      prop::SatValue value = d_satSolver->value(bit);
      Assert(value != prop::SAT_VALUE_UNKNOWN);
      if (!m->assertEquality(
              var, nm->mkConst(value == prop::SAT_VALUE_TRUE), true))
      {
        return false;
      }
    }
  }

  return true;
}

void BVSolverBitblast::initSatSolver()
{
  switch (options().bv.bvSatSolver)
  {
    case options::SatSolverMode::CRYPTOMINISAT:
      d_satSolver.reset(prop::SatSolverFactory::createCryptoMinisat(
          smtStatisticsRegistry(), "theory::bv::BVSolverBitblast::"));
      break;
    default:
      d_satSolver.reset(prop::SatSolverFactory::createCadical(
          smtStatisticsRegistry(), "theory::bv::BVSolverBitblast::"));
  }
  d_cnfStream.reset(new prop::CnfStream(d_satSolver.get(),
                                        d_bbRegistrar.get(),
                                        d_nullContext.get(),
                                        nullptr,
                                        d_env.getResourceManager(),
                                        prop::FormulaLitPolicy::INTERNAL,
                                        "theory::bv::BVSolverBitblast"));
}

Node BVSolverBitblast::getValue(TNode node, bool initialize)
{
  if (node.isConst())
  {
    return node;
  }

  if (!d_bitblaster->hasBBTerm(node))
  {
    return initialize ? utils::mkConst(utils::getSize(node), 0u) : Node();
  }

  std::vector<Node> bits;
  d_bitblaster->getBBTerm(node, bits);
  Integer value(0), one(1), zero(0), bit;
  for (size_t i = 0, size = bits.size(), j = size - 1; i < size; ++i, --j)
  {
    if (d_cnfStream->hasLiteral(bits[j]))
    {
      prop::SatLiteral lit = d_cnfStream->getLiteral(bits[j]);
      prop::SatValue val = d_satSolver->modelValue(lit);
      bit = val == prop::SatValue::SAT_VALUE_TRUE ? one : zero;
    }
    else
    {
      if (!initialize) return Node();
      bit = zero;
    }
    value = value * 2 + bit;
  }
  return utils::mkConst(bits.size(), value);
}

void BVSolverBitblast::handleEagerAtom(TNode fact, bool assertFact)
{
  Assert(fact.getKind() == kind::BITVECTOR_EAGER_ATOM);

  if (assertFact)
  {
    d_cnfStream->convertAndAssert(fact[0], false, false);
  }
  else
  {
    d_cnfStream->ensureLiteral(fact[0]);
  }

  /* convertAndAssert() does not make the connection between the bit-vector
   * atom and it's bit-blasted form (it only calls preRegister() from the
   * registrar). Thus, we add the equalities now. */
  auto& registeredAtoms = d_bbRegistrar->getRegisteredAtoms();
  for (auto atom : registeredAtoms)
  {
    Node bb_atom = d_bitblaster->getStoredBBAtom(atom);
    d_cnfStream->convertAndAssert(atom.eqNode(bb_atom), false, false);
  }
  // Clear cache since we only need to do this once per bit-blasted atom.
  registeredAtoms.clear();
}

}  // 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, Gereon Kremer, Andres Noetzli
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		* Bit-blasting solver that supports multiple SAT backends.
14		*/
15
16		#include "theory/bv/bv_solver_bitblast.h"
17
18		#include "options/bv_options.h"
19		#include "prop/sat_solver_factory.h"
20		#include "smt/smt_statistics_registry.h"
21		#include "theory/bv/theory_bv.h"
22		#include "theory/bv/theory_bv_utils.h"
23		#include "theory/theory_model.h"
24
25		namespace cvc5 {
26		namespace theory {
27		namespace bv {
28
29		/**
30		* Notifies the BV solver when assertions were reset.
31		*
32		* This class is notified after every user-context pop and maintains a flag
33		* that indicates whether assertions have been reset. If the user-context level
34		* reaches level 0 it means that the assertions were reset.
35		*/
36	14568	class NotifyResetAssertions : public context::ContextNotifyObj
37		{
38		public:
39	7289	NotifyResetAssertions(context::Context* c)
40	7289	: context::ContextNotifyObj(c, false),
41		d_context(c),
42	7289	d_doneResetAssertions(false)
43		{
44	7289	}
45
46	6	bool doneResetAssertions() { return d_doneResetAssertions; }
47
48	2	void reset() { d_doneResetAssertions = false; }
49
50		protected:
51	10511	void contextNotifyPop() override
52		{
53		// If the user-context level reaches 0 it means that reset-assertions was
54		// called.
55	10511	if (d_context->getLevel() == 0)
56		{
57	7329	d_doneResetAssertions = true;
58		}
59	10511	}
60
61		private:
62		/** The user-context. */
63		context::Context* d_context;
64
65		/** Flag to notify whether reset assertions was called. */
66		bool d_doneResetAssertions;
67		};
68
69		/**
70		* Bit-blasting registrar.
71		*
72		* The CnfStream calls preRegister() if it encounters a theory atom.
73		* This registrar bit-blasts given atom and remembers which bit-vector atoms
74		* were bit-blasted.
75		*
76		* This registrar is needed when --bitblast=eager is enabled.
77		*/
78	14568	class BBRegistrar : public prop::Registrar
79		{
80		public:
81	7289	BBRegistrar(NodeBitblaster* bb) : d_bitblaster(bb) {}
82
83	153686	void preRegister(Node n) override
84		{
85	153686	if (d_registeredAtoms.find(n) != d_registeredAtoms.end())
86		{
87		return;
88		}
89		/* We are only interested in bit-vector atoms. */
90	307540	if ((n.getKind() == kind::EQUAL && n[0].getType().isBitVector())
91	153518	\|\| n.getKind() == kind::BITVECTOR_ULT
92	153479	\|\| n.getKind() == kind::BITVECTOR_ULE
93	153479	\|\| n.getKind() == kind::BITVECTOR_SLT
94	460851	\|\| n.getKind() == kind::BITVECTOR_SLE)
95		{
96	207	d_registeredAtoms.insert(n);
97	207	d_bitblaster->bbAtom(n);
98		}
99		}
100
101	96	std::unordered_set<TNode>& getRegisteredAtoms() { return d_registeredAtoms; }
102
103		private:
104		/** The bitblaster used. */
105		NodeBitblaster* d_bitblaster;
106
107		/** Stores bit-vector atoms encounterd on preRegister(). */
108		std::unordered_set<TNode> d_registeredAtoms;
109		};
110
111	7289	BVSolverBitblast::BVSolverBitblast(Env& env,
112		TheoryState* s,
113		TheoryInferenceManager& inferMgr,
114	7289	ProofNodeManager* pnm)
115		: BVSolver(env, *s, inferMgr),
116	7289	d_bitblaster(new NodeBitblaster(env, s)),
117	7289	d_bbRegistrar(new BBRegistrar(d_bitblaster.get())),
118	7289	d_nullContext(new context::Context()),
119		d_bbFacts(context()),
120		d_bbInputFacts(context()),
121		d_assumptions(context()),
122		d_assertions(context()),
123	12	d_epg(pnm ? new EagerProofGenerator(pnm, userContext(), "")
124		: nullptr),
125		d_factLiteralCache(context()),
126		d_literalFactCache(context()),
127	7289	d_propagate(options().bv.bitvectorPropagate),
128	36457	d_resetNotify(new NotifyResetAssertions(userContext()))
129		{
130	7289	if (pnm != nullptr)
131		{
132	6	d_bvProofChecker.registerTo(pnm->getChecker());
133		}
134
135	7289	initSatSolver();
136	7289	}
137
138	780972	void BVSolverBitblast::postCheck(Theory::Effort level)
139		{
140	780972	if (level != Theory::Effort::EFFORT_FULL)
141		{
142		/* Do bit-level propagation only if the SAT solver supports it. */
143	744699	if (!d_propagate \|\| !d_satSolver->setPropagateOnly())
144		{
145	744699	return;
146		}
147		}
148
149		// If we permanently added assertions to the SAT solver and the assertions
150		// were reset, we have to reset the SAT solver and the CNF stream.
151	36273	if (options().bv.bvAssertInput && d_resetNotify->doneResetAssertions())
152		{
153	2	d_satSolver.reset(nullptr);
154	2	d_cnfStream.reset(nullptr);
155	2	initSatSolver();
156	2	d_resetNotify->reset();
157		}
158
159	36273	NodeManager* nm = NodeManager::currentNM();
160
161		/* Process input assertions bit-blast queue. */
162	36289	while (!d_bbInputFacts.empty())
163		{
164	16	Node fact = d_bbInputFacts.front();
165	8	d_bbInputFacts.pop();
166		/* Bit-blast fact and cache literal. */
167	8	if (d_factLiteralCache.find(fact) == d_factLiteralCache.end())
168		{
169	8	if (fact.getKind() == kind::BITVECTOR_EAGER_ATOM)
170		{
171		handleEagerAtom(fact, true);
172		}
173		else
174		{
175	8	d_bitblaster->bbAtom(fact);
176	16	Node bb_fact = d_bitblaster->getStoredBBAtom(fact);
177	8	d_cnfStream->convertAndAssert(bb_fact, false, false);
178		}
179		}
180	8	d_assertions.push_back(fact);
181		}
182
183		/* Process bit-blast queue and store SAT literals. */
184	5389299	while (!d_bbFacts.empty())
185		{
186	5353026	Node fact = d_bbFacts.front();
187	2676513	d_bbFacts.pop();
188		/* Bit-blast fact and cache literal. */
189	2676513	if (d_factLiteralCache.find(fact) == d_factLiteralCache.end())
190		{
191	2676513	prop::SatLiteral lit;
192	2676513	if (fact.getKind() == kind::BITVECTOR_EAGER_ATOM)
193		{
194	96	handleEagerAtom(fact, false);
195	96	lit = d_cnfStream->getLiteral(fact[0]);
196		}
197		else
198		{
199	2676417	d_bitblaster->bbAtom(fact);
200	5352834	Node bb_fact = d_bitblaster->getStoredBBAtom(fact);
201	2676417	d_cnfStream->ensureLiteral(bb_fact);
202	2676417	lit = d_cnfStream->getLiteral(bb_fact);
203		}
204	2676513	d_factLiteralCache[fact] = lit;
205	2676513	d_literalFactCache[lit] = fact;
206		}
207	2676513	d_assumptions.push_back(d_factLiteralCache[fact]);
208		}
209
210		std::vector<prop::SatLiteral> assumptions(d_assumptions.begin(),
211	72546	d_assumptions.end());
212	36273	prop::SatValue val = d_satSolver->solve(assumptions);
213
214	36273	if (val == prop::SatValue::SAT_VALUE_FALSE)
215		{
216	29944	std::vector<prop::SatLiteral> unsat_assumptions;
217	14972	d_satSolver->getUnsatAssumptions(unsat_assumptions);
218
219	29944	Node conflict;
220		// Unsat assumptions produce conflict.
221	14972	if (unsat_assumptions.size() > 0)
222		{
223	29944	std::vector<Node> conf;
224	127296	for (const prop::SatLiteral& lit : unsat_assumptions)
225		{
226	112324	conf.push_back(d_literalFactCache[lit]);
227	224648	Debug("bv-bitblast")
228	112324	<< "unsat assumption (" << lit << "): " << conf.back() << std::endl;
229		}
230	14972	conflict = nm->mkAnd(conf);
231		}
232		else // Input assertions produce conflict.
233		{
234		std::vector<Node> assertions(d_assertions.begin(), d_assertions.end());
235		conflict = nm->mkAnd(assertions);
236		}
237	14972	d_im.conflict(conflict, InferenceId::BV_BITBLAST_CONFLICT);
238		}
239		}
240
241	1302326	bool BVSolverBitblast::preNotifyFact(
242		TNode atom, bool pol, TNode fact, bool isPrereg, bool isInternal)
243		{
244	1302326	Valuation& val = d_state.getValuation();
245
246		/**
247		* Check whether `fact` is an input assertion on user-level 0.
248		*
249		* If this is the case we can assert `fact` to the SAT solver instead of
250		* using assumptions.
251		*/
252	2604660	if (options().bv.bvAssertInput && val.isSatLiteral(fact)
253	2604660	&& val.getDecisionLevel(fact) == 0 && val.getIntroLevel(fact) == 0)
254		{
255	8	Assert(!val.isDecision(fact));
256	8	d_bbInputFacts.push_back(fact);
257		}
258		else
259		{
260	1302318	d_bbFacts.push_back(fact);
261		}
262
263	1302326	return false; // Return false to enable equality engine reasoning in Theory.
264		}
265
266	4806	TrustNode BVSolverBitblast::explain(TNode n)
267		{
268	4806	Debug("bv-bitblast") << "explain called on " << n << std::endl;
269	4806	return d_im.explainLit(n);
270		}
271
272	7318	void BVSolverBitblast::computeRelevantTerms(std::set<Node>& termSet)
273		{
274		/* BITVECTOR_EAGER_ATOM wraps input assertions that may also contain
275		* equalities. As a result, these equalities are not handled by the equality
276		* engine and terms below these equalities do not appear in `termSet`.
277		* We need to make sure that we compute model values for all relevant terms
278		* in BitblastMode::EAGER and therefore add all variables from the
279		* bit-blaster to `termSet`.
280		*/
281	7318	if (options().bv.bitblastMode == options::BitblastMode::EAGER)
282		{
283	10	d_bitblaster->computeRelevantTerms(termSet);
284		}
285	7318	}
286
287	7318	bool BVSolverBitblast::collectModelValues(TheoryModel* m,
288		const std::set<Node>& termSet)
289		{
290	262811	for (const auto& term : termSet)
291		{
292	255493	if (!d_bitblaster->isVariable(term))
293		{
294	216705	continue;
295		}
296
297	77576	Node value = getValue(term, true);
298	38788	Assert(value.isConst());
299	38788	if (!m->assertEquality(term, value, true))
300		{
301		return false;
302		}
303		}
304
305		// In eager bitblast mode we also have to collect the model values for
306		// Boolean variables in the CNF stream.
307	7318	if (options().bv.bitblastMode == options::BitblastMode::EAGER)
308		{
309	10	NodeManager* nm = NodeManager::currentNM();
310	20	std::vector<TNode> vars;
311	10	d_cnfStream->getBooleanVariables(vars);
312	12	for (TNode var : vars)
313		{
314	2	Assert(d_cnfStream->hasLiteral(var));
315	2	prop::SatLiteral bit = d_cnfStream->getLiteral(var);
316	2	prop::SatValue value = d_satSolver->value(bit);
317	2	Assert(value != prop::SAT_VALUE_UNKNOWN);
318	4	if (!m->assertEquality(
319	4	var, nm->mkConst(value == prop::SAT_VALUE_TRUE), true))
320		{
321		return false;
322		}
323		}
324		}
325
326	7318	return true;
327		}
328
329	7291	void BVSolverBitblast::initSatSolver()
330		{
331	7291	switch (options().bv.bvSatSolver)
332		{
333	4	case options::SatSolverMode::CRYPTOMINISAT:
334	4	d_satSolver.reset(prop::SatSolverFactory::createCryptoMinisat(
335		smtStatisticsRegistry(), "theory::bv::BVSolverBitblast::"));
336	4	break;
337	7287	default:
338	7287	d_satSolver.reset(prop::SatSolverFactory::createCadical(
339		smtStatisticsRegistry(), "theory::bv::BVSolverBitblast::"));
340		}
341	21873	d_cnfStream.reset(new prop::CnfStream(d_satSolver.get(),
342	7291	d_bbRegistrar.get(),
343	7291	d_nullContext.get(),
344		nullptr,
345	7291	d_env.getResourceManager(),
346		prop::FormulaLitPolicy::INTERNAL,
347	7291	"theory::bv::BVSolverBitblast"));
348	7291	}
349
350	39904	Node BVSolverBitblast::getValue(TNode node, bool initialize)
351		{
352	39904	if (node.isConst())
353		{
354		return node;
355		}
356
357	39904	if (!d_bitblaster->hasBBTerm(node))
358		{
359	654	return initialize ? utils::mkConst(utils::getSize(node), 0u) : Node();
360		}
361
362	78500	std::vector<Node> bits;
363	39250	d_bitblaster->getBBTerm(node, bits);
364	78500	Integer value(0), one(1), zero(0), bit;
365	962851	for (size_t i = 0, size = bits.size(), j = size - 1; i < size; ++i, --j)
366		{
367	923691	if (d_cnfStream->hasLiteral(bits[j]))
368		{
369	916787	prop::SatLiteral lit = d_cnfStream->getLiteral(bits[j]);
370	916787	prop::SatValue val = d_satSolver->modelValue(lit);
371	916787	bit = val == prop::SatValue::SAT_VALUE_TRUE ? one : zero;
372		}
373		else
374		{
375	6904	if (!initialize) return Node();
376	6814	bit = zero;
377		}
378	923601	value = value * 2 + bit;
379		}
380	39160	return utils::mkConst(bits.size(), value);
381		}
382
383	96	void BVSolverBitblast::handleEagerAtom(TNode fact, bool assertFact)
384		{
385	96	Assert(fact.getKind() == kind::BITVECTOR_EAGER_ATOM);
386
387	96	if (assertFact)
388		{
389		d_cnfStream->convertAndAssert(fact[0], false, false);
390		}
391		else
392		{
393	96	d_cnfStream->ensureLiteral(fact[0]);
394		}
395
396		/* convertAndAssert() does not make the connection between the bit-vector
397		* atom and it's bit-blasted form (it only calls preRegister() from the
398		* registrar). Thus, we add the equalities now. */
399	96	auto& registeredAtoms = d_bbRegistrar->getRegisteredAtoms();
400	303	for (auto atom : registeredAtoms)
401		{
402	414	Node bb_atom = d_bitblaster->getStoredBBAtom(atom);
403	207	d_cnfStream->convertAndAssert(atom.eqNode(bb_atom), false, false);
404		}
405		// Clear cache since we only need to do this once per bit-blasted atom.
406	96	registeredAtoms.clear();
407	96	}
408
409		} // namespace bv
410		} // namespace theory
411	31125	} // namespace cvc5