Head

GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/smt/smt_solver.cpp	Lines:	87	98	88.8 %
Date:	2021-08-19	Branches:	139	286	48.6 %


/******************************************************************************
 * Top contributors (to current version):
 *   Andrew Reynolds, Aina Niemetz, Morgan Deters
 *
 * 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.
 * ****************************************************************************
 *
 * The solver for SMT queries in an SmtEngine.
 */

#include "smt/smt_solver.h"

#include "options/smt_options.h"
#include "prop/prop_engine.h"
#include "smt/assertions.h"
#include "smt/env.h"
#include "smt/preprocessor.h"
#include "smt/smt_engine.h"
#include "smt/smt_engine_state.h"
#include "smt/smt_engine_stats.h"
#include "theory/logic_info.h"
#include "theory/theory_engine.h"
#include "theory/theory_traits.h"

using namespace std;

namespace cvc5 {
namespace smt {

SmtSolver::SmtSolver(Env& env,
                     SmtEngineState& state,
                     Preprocessor& pp,
                     SmtEngineStatistics& stats)
    : d_env(env),
      d_state(state),
      d_pp(pp),
      d_stats(stats),
      d_theoryEngine(nullptr),
      d_propEngine(nullptr)
{
}

SmtSolver::~SmtSolver() {}

void SmtSolver::finishInit(const LogicInfo& logicInfo)
{
  // We have mutual dependency here, so we add the prop engine to the theory
  // engine later (it is non-essential there)
  d_theoryEngine.reset(new TheoryEngine(d_env));

  // Add the theories
  for (theory::TheoryId id = theory::THEORY_FIRST; id < theory::THEORY_LAST;
       ++id)
  {
    theory::TheoryConstructor::addTheory(d_theoryEngine.get(), id);
  }
  // Add the proof checkers for each theory
  ProofNodeManager* pnm = d_env.getProofNodeManager();
  if (pnm)
  {
    d_theoryEngine->initializeProofChecker(pnm->getChecker());
  }
  Trace("smt-debug") << "Making prop engine..." << std::endl;
  /* force destruction of referenced PropEngine to enforce that statistics
   * are unregistered by the obsolete PropEngine object before registered
   * again by the new PropEngine object */
  d_propEngine.reset(nullptr);
  d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));

  Trace("smt-debug") << "Setting up theory engine..." << std::endl;
  d_theoryEngine->setPropEngine(getPropEngine());
  Trace("smt-debug") << "Finishing init for theory engine..." << std::endl;
  d_theoryEngine->finishInit();
  d_propEngine->finishInit();
}

void SmtSolver::resetAssertions()
{
  /* Create new PropEngine.
   * First force destruction of referenced PropEngine to enforce that
   * statistics are unregistered by the obsolete PropEngine object before
   * registered again by the new PropEngine object */
  d_propEngine.reset(nullptr);
  d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));
  d_theoryEngine->setPropEngine(getPropEngine());
  // Notice that we do not reset TheoryEngine, nor does it require calling
  // finishInit again. In particular, TheoryEngine::finishInit does not
  // depend on knowing the associated PropEngine.
  d_propEngine->finishInit();
}

void SmtSolver::interrupt()
{
  if (d_propEngine != nullptr)
  {
    d_propEngine->interrupt();
  }
  if (d_theoryEngine != nullptr)
  {
    d_theoryEngine->interrupt();
  }
}

void SmtSolver::shutdown()
{
  if (d_propEngine != nullptr)
  {
    d_propEngine->shutdown();
  }
  if (d_theoryEngine != nullptr)
  {
    d_theoryEngine->shutdown();
  }
}

Result SmtSolver::checkSatisfiability(Assertions& as,
                                      const std::vector<Node>& assumptions,
                                      bool isEntailmentCheck)
{
  // update the state to indicate we are about to run a check-sat
  bool hasAssumptions = !assumptions.empty();
  d_state.notifyCheckSat(hasAssumptions);

  // then, initialize the assertions
  as.initializeCheckSat(assumptions, isEntailmentCheck);

  // make the check, where notice smt engine should be fully inited by now

  Trace("smt") << "SmtSolver::check()" << endl;

  const std::string& filename = d_env.getFilename();
  ResourceManager* rm = d_env.getResourceManager();
  if (rm->out())
  {
    Result::UnknownExplanation why =
        rm->outOfResources() ? Result::RESOURCEOUT : Result::TIMEOUT;
    return Result(Result::ENTAILMENT_UNKNOWN, why, filename);
  }
  rm->beginCall();

  // Make sure the prop layer has all of the assertions
  Trace("smt") << "SmtSolver::check(): processing assertions" << endl;
  processAssertions(as);
  Trace("smt") << "SmtSolver::check(): done processing assertions" << endl;

  TimerStat::CodeTimer solveTimer(d_stats.d_solveTime);

  Chat() << "solving..." << endl;
  Trace("smt") << "SmtSolver::check(): running check" << endl;
  Result result = d_propEngine->checkSat();

  rm->endCall();
  Trace("limit") << "SmtSolver::check(): cumulative millis "
                 << rm->getTimeUsage() << ", resources "
                 << rm->getResourceUsage() << endl;

  if ((options::solveRealAsInt() || options::solveIntAsBV() > 0)
      && result.asSatisfiabilityResult().isSat() == Result::UNSAT)
  {
    result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
  }
  // flipped if we did a global negation
  if (as.isGlobalNegated())
  {
    Trace("smt") << "SmtSolver::process global negate " << result << std::endl;
    if (result.asSatisfiabilityResult().isSat() == Result::UNSAT)
    {
      result = Result(Result::SAT);
    }
    else if (result.asSatisfiabilityResult().isSat() == Result::SAT)
    {
      // Only can answer unsat if the theory is satisfaction complete. This
      // includes linear arithmetic and bitvectors, which are the primary
      // targets for the global negate option. Other logics are possible here
      // but not considered.
      LogicInfo logic = d_env.getLogicInfo();
      if ((logic.isPure(theory::THEORY_ARITH) && logic.isLinear()) ||
          logic.isPure(theory::THEORY_BV))
      {
        result = Result(Result::UNSAT);
      }
      else
      {
        result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
      }
    }
    Trace("smt") << "SmtSolver::global negate returned " << result << std::endl;
  }

  // set the filename on the result
  Result r = Result(result, filename);

  // notify our state of the check-sat result
  d_state.notifyCheckSatResult(hasAssumptions, r);

  return r;
}

void SmtSolver::processAssertions(Assertions& as)
{
  TimerStat::CodeTimer paTimer(d_stats.d_processAssertionsTime);
  d_env.getResourceManager()->spendResource(Resource::PreprocessStep);
  Assert(d_state.isFullyReady());

  preprocessing::AssertionPipeline& ap = as.getAssertionPipeline();

  if (ap.size() == 0)
  {
    // nothing to do
    return;
  }

  // process the assertions with the preprocessor
  d_pp.process(as);

  // end: INVARIANT to maintain: no reordering of assertions or
  // introducing new ones

  // Push the formula to SAT
  {
    Chat() << "converting to CNF..." << endl;
    const std::vector<Node>& assertions = ap.ref();
    // It is important to distinguish the input assertions from the skolem
    // definitions, as the decision justification heuristic treates the latter
    // specially.
    preprocessing::IteSkolemMap& ism = ap.getIteSkolemMap();
    d_propEngine->assertInputFormulas(assertions, ism);
  }

  // clear the current assertions
  as.clearCurrent();
}

TheoryEngine* SmtSolver::getTheoryEngine() { return d_theoryEngine.get(); }

prop::PropEngine* SmtSolver::getPropEngine() { return d_propEngine.get(); }

theory::QuantifiersEngine* SmtSolver::getQuantifiersEngine()
{
  Assert(d_theoryEngine != nullptr);
  return d_theoryEngine->getQuantifiersEngine();
}

Preprocessor* SmtSolver::getPreprocessor() { return &d_pp; }

}  // namespace smt
}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Andrew Reynolds, Aina Niemetz, Morgan Deters
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		* The solver for SMT queries in an SmtEngine.
14		*/
15
16		#include "smt/smt_solver.h"
17
18		#include "options/smt_options.h"
19		#include "prop/prop_engine.h"
20		#include "smt/assertions.h"
21		#include "smt/env.h"
22		#include "smt/preprocessor.h"
23		#include "smt/smt_engine.h"
24		#include "smt/smt_engine_state.h"
25		#include "smt/smt_engine_stats.h"
26		#include "theory/logic_info.h"
27		#include "theory/theory_engine.h"
28		#include "theory/theory_traits.h"
29
30		using namespace std;
31
32		namespace cvc5 {
33		namespace smt {
34
35	10498	SmtSolver::SmtSolver(Env& env,
36		SmtEngineState& state,
37		Preprocessor& pp,
38	10498	SmtEngineStatistics& stats)
39		: d_env(env),
40		d_state(state),
41		d_pp(pp),
42		d_stats(stats),
43		d_theoryEngine(nullptr),
44	10498	d_propEngine(nullptr)
45		{
46	10498	}
47
48	10498	SmtSolver::~SmtSolver() {}
49
50	9854	void SmtSolver::finishInit(const LogicInfo& logicInfo)
51		{
52		// We have mutual dependency here, so we add the prop engine to the theory
53		// engine later (it is non-essential there)
54	9854	d_theoryEngine.reset(new TheoryEngine(d_env));
55
56		// Add the theories
57	137956	for (theory::TheoryId id = theory::THEORY_FIRST; id < theory::THEORY_LAST;
58		++id)
59		{
60	128102	theory::TheoryConstructor::addTheory(d_theoryEngine.get(), id);
61		}
62		// Add the proof checkers for each theory
63	9854	ProofNodeManager* pnm = d_env.getProofNodeManager();
64	9854	if (pnm)
65		{
66	3769	d_theoryEngine->initializeProofChecker(pnm->getChecker());
67		}
68	9854	Trace("smt-debug") << "Making prop engine..." << std::endl;
69		/* force destruction of referenced PropEngine to enforce that statistics
70		* are unregistered by the obsolete PropEngine object before registered
71		* again by the new PropEngine object */
72	9854	d_propEngine.reset(nullptr);
73	9854	d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));
74
75	9854	Trace("smt-debug") << "Setting up theory engine..." << std::endl;
76	9854	d_theoryEngine->setPropEngine(getPropEngine());
77	9854	Trace("smt-debug") << "Finishing init for theory engine..." << std::endl;
78	9854	d_theoryEngine->finishInit();
79	9854	d_propEngine->finishInit();
80	9854	}
81
82	67	void SmtSolver::resetAssertions()
83		{
84		/* Create new PropEngine.
85		* First force destruction of referenced PropEngine to enforce that
86		* statistics are unregistered by the obsolete PropEngine object before
87		* registered again by the new PropEngine object */
88	67	d_propEngine.reset(nullptr);
89	67	d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));
90	67	d_theoryEngine->setPropEngine(getPropEngine());
91		// Notice that we do not reset TheoryEngine, nor does it require calling
92		// finishInit again. In particular, TheoryEngine::finishInit does not
93		// depend on knowing the associated PropEngine.
94	67	d_propEngine->finishInit();
95	67	}
96
97		void SmtSolver::interrupt()
98		{
99		if (d_propEngine != nullptr)
100		{
101		d_propEngine->interrupt();
102		}
103		if (d_theoryEngine != nullptr)
104		{
105		d_theoryEngine->interrupt();
106		}
107		}
108
109	10498	void SmtSolver::shutdown()
110		{
111	10498	if (d_propEngine != nullptr)
112		{
113	9854	d_propEngine->shutdown();
114		}
115	10498	if (d_theoryEngine != nullptr)
116		{
117	9854	d_theoryEngine->shutdown();
118		}
119	10498	}
120
121	15219	Result SmtSolver::checkSatisfiability(Assertions& as,
122		const std::vector<Node>& assumptions,
123		bool isEntailmentCheck)
124		{
125		// update the state to indicate we are about to run a check-sat
126	15219	bool hasAssumptions = !assumptions.empty();
127	15219	d_state.notifyCheckSat(hasAssumptions);
128
129		// then, initialize the assertions
130	15219	as.initializeCheckSat(assumptions, isEntailmentCheck);
131
132		// make the check, where notice smt engine should be fully inited by now
133
134	15219	Trace("smt") << "SmtSolver::check()" << endl;
135
136	15219	const std::string& filename = d_env.getFilename();
137	15219	ResourceManager* rm = d_env.getResourceManager();
138	15219	if (rm->out())
139		{
140		Result::UnknownExplanation why =
141		rm->outOfResources() ? Result::RESOURCEOUT : Result::TIMEOUT;
142		return Result(Result::ENTAILMENT_UNKNOWN, why, filename);
143		}
144	15219	rm->beginCall();
145
146		// Make sure the prop layer has all of the assertions
147	15219	Trace("smt") << "SmtSolver::check(): processing assertions" << endl;
148	15219	processAssertions(as);
149	15205	Trace("smt") << "SmtSolver::check(): done processing assertions" << endl;
150
151	30410	TimerStat::CodeTimer solveTimer(d_stats.d_solveTime);
152
153	15205	Chat() << "solving..." << endl;
154	15205	Trace("smt") << "SmtSolver::check(): running check" << endl;
155	30394	Result result = d_propEngine->checkSat();
156
157	15189	rm->endCall();
158	30378	Trace("limit") << "SmtSolver::check(): cumulative millis "
159	30378	<< rm->getTimeUsage() << ", resources "
160	15189	<< rm->getResourceUsage() << endl;
161
162	45554	if ((options::solveRealAsInt() \|\| options::solveIntAsBV() > 0)
163	30405	&& result.asSatisfiabilityResult().isSat() == Result::UNSAT)
164		{
165	6	result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
166		}
167		// flipped if we did a global negation
168	15189	if (as.isGlobalNegated())
169		{
170	6	Trace("smt") << "SmtSolver::process global negate " << result << std::endl;
171	6	if (result.asSatisfiabilityResult().isSat() == Result::UNSAT)
172		{
173	4	result = Result(Result::SAT);
174		}
175	2	else if (result.asSatisfiabilityResult().isSat() == Result::SAT)
176		{
177		// Only can answer unsat if the theory is satisfaction complete. This
178		// includes linear arithmetic and bitvectors, which are the primary
179		// targets for the global negate option. Other logics are possible here
180		// but not considered.
181	4	LogicInfo logic = d_env.getLogicInfo();
182	2	if ((logic.isPure(theory::THEORY_ARITH) && logic.isLinear()) \|\|
183		logic.isPure(theory::THEORY_BV))
184		{
185	2	result = Result(Result::UNSAT);
186		}
187		else
188		{
189		result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
190		}
191		}
192	6	Trace("smt") << "SmtSolver::global negate returned " << result << std::endl;
193		}
194
195		// set the filename on the result
196	30378	Result r = Result(result, filename);
197
198		// notify our state of the check-sat result
199	15189	d_state.notifyCheckSatResult(hasAssumptions, r);
200
201	15189	return r;
202		}
203
204	24192	void SmtSolver::processAssertions(Assertions& as)
205		{
206	37943	TimerStat::CodeTimer paTimer(d_stats.d_processAssertionsTime);
207	24192	d_env.getResourceManager()->spendResource(Resource::PreprocessStep);
208	24192	Assert(d_state.isFullyReady());
209
210	24192	preprocessing::AssertionPipeline& ap = as.getAssertionPipeline();
211
212	24192	if (ap.size() == 0)
213		{
214		// nothing to do
215	10441	return;
216		}
217
218		// process the assertions with the preprocessor
219	13751	d_pp.process(as);
220
221		// end: INVARIANT to maintain: no reordering of assertions or
222		// introducing new ones
223
224		// Push the formula to SAT
225		{
226	13741	Chat() << "converting to CNF..." << endl;
227	13741	const std::vector<Node>& assertions = ap.ref();
228		// It is important to distinguish the input assertions from the skolem
229		// definitions, as the decision justification heuristic treates the latter
230		// specially.
231	13741	preprocessing::IteSkolemMap& ism = ap.getIteSkolemMap();
232	13741	d_propEngine->assertInputFormulas(assertions, ism);
233		}
234
235		// clear the current assertions
236	13737	as.clearCurrent();
237		}
238
239	358823	TheoryEngine* SmtSolver::getTheoryEngine() { return d_theoryEngine.get(); }
240
241	66125	prop::PropEngine* SmtSolver::getPropEngine() { return d_propEngine.get(); }
242
243	374	theory::QuantifiersEngine* SmtSolver::getQuantifiersEngine()
244		{
245	374	Assert(d_theoryEngine != nullptr);
246	374	return d_theoryEngine->getQuantifiersEngine();
247		}
248
249		Preprocessor* SmtSolver::getPreprocessor() { return &d_pp; }
250
251		} // namespace smt
252	29349	} // namespace cvc5