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/********************* */
/*! \file model_manager.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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.\endverbatim
**
** \brief Abstract management of models for TheoryEngine.
**/
#include "theory/model_manager.h"
#include "options/theory_options.h"
#include "theory/quantifiers_engine.h"
#include "theory/theory_engine.h"
namespace CVC4 {
namespace theory {
ModelManager::ModelManager(TheoryEngine& te, EqEngineManager& eem)
: d_te(te),
d_logicInfo(te.getLogicInfo()),
d_eem(eem),
d_modelEqualityEngine(nullptr),
d_modelEqualityEngineAlloc(nullptr),
d_model(nullptr),
d_modelBuilder(nullptr),
d_modelBuilt(false),
d_modelBuiltSuccess(false)
{
}
ModelManager::~ModelManager() {}
void ModelManager::finishInit(eq::EqualityEngineNotify* notify)
{
// construct the model
const LogicInfo& logicInfo = d_te.getLogicInfo();
// Initialize the model and model builder.
if (logicInfo.isQuantified())
{
QuantifiersEngine* qe = d_te.getQuantifiersEngine();
Assert(qe != nullptr);
d_modelBuilder = qe->getModelBuilder();
d_model = qe->getModel();
}
else
{
context::Context* u = d_te.getUserContext();
d_alocModel.reset(
new TheoryModel(u, "DefaultModel", options::assignFunctionValues()));
d_model = d_alocModel.get();
}
// make the default builder, e.g. in the case that the quantifiers engine does
// not have a model builder
if (d_modelBuilder == nullptr)
{
d_alocModelBuilder.reset(new TheoryEngineModelBuilder(&d_te));
d_modelBuilder = d_alocModelBuilder.get();
}
// notice that the equality engine of the model has yet to be assigned.
initializeModelEqEngine(notify);
}
void ModelManager::resetModel()
{
d_modelBuilt = false;
d_modelBuiltSuccess = false;
// Reset basic information on the model object
d_model->reset();
}
bool ModelManager::buildModel()
{
if (d_modelBuilt)
{
// already computed
return d_modelBuiltSuccess;
}
// reset the flags now
d_modelBuilt = true;
d_modelBuiltSuccess = false;
// prepare the model, which is specific to the manager
if (!prepareModel())
{
Trace("model-builder") << "ModelManager: fail prepare model" << std::endl;
return false;
}
// now, finish building the model
d_modelBuiltSuccess = finishBuildModel();
return d_modelBuiltSuccess;
}
bool ModelManager::isModelBuilt() const { return d_modelBuilt; }
void ModelManager::postProcessModel(bool incomplete)
{
if (!d_modelBuilt)
{
// model not built, nothing to do
return;
}
Trace("model-builder") << "ModelManager: post-process model..." << std::endl;
// model construction should always succeed unless lemmas were added
AlwaysAssert(d_modelBuiltSuccess);
if (!options::produceModels())
{
return;
}
// Do post-processing of model from the theories (used for THEORY_SEP
// to construct heap model)
for (TheoryId theoryId = theory::THEORY_FIRST; theoryId < theory::THEORY_LAST;
++theoryId)
{
Theory* t = d_te.theoryOf(theoryId);
if (t == nullptr)
{
// theory not active, skip
continue;
}
Trace("model-builder-debug")
<< " PostProcessModel on theory: " << theoryId << std::endl;
t->postProcessModel(d_model);
}
// also call the model builder's post-process model
d_modelBuilder->postProcessModel(incomplete, d_model);
}
theory::TheoryModel* ModelManager::getModel() { return d_model; }
bool ModelManager::collectModelBooleanVariables()
{
Trace("model-builder") << " CollectModelInfo boolean variables" << std::endl;
// Get value of the Boolean variables
prop::PropEngine* propEngine = d_te.getPropEngine();
std::vector<TNode> boolVars;
propEngine->getBooleanVariables(boolVars);
std::vector<TNode>::iterator it, iend = boolVars.end();
bool hasValue, value;
for (it = boolVars.begin(); it != iend; ++it)
{
TNode var = *it;
hasValue = propEngine->hasValue(var, value);
// Should we assert that hasValue is true?
if (!hasValue)
{
Trace("model-builder-assertions")
<< " has no value : " << var << std::endl;
value = false;
}
Trace("model-builder-assertions")
<< "(assert" << (value ? " " : " (not ") << var
<< (value ? ");" : "));") << std::endl;
if (!d_model->assertPredicate(var, value))
{
return false;
}
}
return true;
}
void ModelManager::collectAssertedTerms(TheoryId tid,
std::set<Node>& termSet,
bool includeShared) const
{
Theory* t = d_te.theoryOf(tid);
// Collect all terms appearing in assertions
context::CDList<Assertion>::const_iterator assert_it = t->facts_begin(),
assert_it_end = t->facts_end();
for (; assert_it != assert_it_end; ++assert_it)
{
collectTerms(tid, *assert_it, termSet);
}
if (includeShared)
{
// Add terms that are shared terms
context::CDList<TNode>::const_iterator shared_it = t->shared_terms_begin(),
shared_it_end =
t->shared_terms_end();
for (; shared_it != shared_it_end; ++shared_it)
{
collectTerms(tid, *shared_it, termSet);
}
}
}
void ModelManager::collectTerms(TheoryId tid,
TNode n,
std::set<Node>& termSet) const
{
const std::set<Kind>& irrKinds = d_model->getIrrelevantKinds();
std::vector<TNode> visit;
TNode cur;
visit.push_back(n);
do
{
cur = visit.back();
visit.pop_back();
if (termSet.find(cur) != termSet.end())
{
// already visited
continue;
}
Kind k = cur.getKind();
// only add to term set if a relevant kind
if (irrKinds.find(k) == irrKinds.end())
{
termSet.insert(cur);
}
// traverse owned terms, don't go under quantifiers
if ((k == kind::NOT || k == kind::EQUAL || Theory::theoryOf(cur) == tid)
&& !cur.isClosure())
{
visit.insert(visit.end(), cur.begin(), cur.end());
}
} while (!visit.empty());
}
} // namespace theory
} // namespace CVC4
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