/********************* */
/*! \file theory_bv.cpp
** \verbatim
- ** Original author: Dejan Jovanovic
- ** Major contributors: Liana Hadarean
- ** Minor contributors (to current version): Tim King, Kshitij Bansal, Clark Barrett, Andrew Reynolds, Morgan Deters, Martin Brain <>
+ ** Top contributors (to current version):
+ ** Mathias Preiner, Andrew Reynolds, Martin Brain
** This file is part of the CVC4 project.
- ** Copyright (c) 2009-2014 New York University and The University of Iowa
- ** See the file COPYING in the top-level source directory for licensing
- ** information.\endverbatim
+ ** 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
**
** [[ Add lengthier description here ]]
** \todo document this file
#include "options/bv_options.h"
#include "options/smt_options.h"
-#include "theory/bv/abstraction.h"
-#include "theory/bv/bv_eager_solver.h"
-#include "theory/bv/bv_subtheory_algebraic.h"
-#include "theory/bv/bv_subtheory_bitblast.h"
-#include "theory/bv/bv_subtheory_core.h"
-#include "theory/bv/bv_subtheory_inequality.h"
-#include "theory/bv/slicer.h"
-#include "theory/bv/theory_bv_rewrite_rules_normalization.h"
-#include "theory/bv/theory_bv_rewrite_rules_simplification.h"
-#include "theory/bv/theory_bv_rewriter.h"
+#include "theory/bv/bv_solver_bitblast.h"
+#include "theory/bv/bv_solver_lazy.h"
+#include "theory/bv/bv_solver_simple.h"
#include "theory/bv/theory_bv_utils.h"
-#include "theory/theory_model.h"
-#include "theory/valuation.h"
-
-using namespace CVC4::context;
-using namespace CVC4::theory::bv::utils;
-using namespace std;
namespace CVC4 {
namespace theory {
namespace bv {
-TheoryBV::TheoryBV(context::Context* c, context::UserContext* u,
- OutputChannel& out, Valuation valuation,
- const LogicInfo& logicInfo, SmtGlobals* globals)
- : Theory(THEORY_BV, c, u, out, valuation, logicInfo, globals),
- d_context(c),
- d_alreadyPropagatedSet(c),
- d_sharedTermsSet(c),
- d_subtheories(),
- d_subtheoryMap(),
- d_statistics(),
- d_staticLearnCache(),
- d_lemmasAdded(c, false),
- d_conflict(c, false),
- d_invalidateModelCache(c, true),
- d_literalsToPropagate(c),
- d_literalsToPropagateIndex(c, 0),
- d_propagatedBy(c),
- d_eagerSolver(NULL),
- d_abstractionModule(new AbstractionModule()),
- d_isCoreTheory(false),
- d_calledPreregister(false)
+TheoryBV::TheoryBV(context::Context* c,
+ context::UserContext* u,
+ OutputChannel& out,
+ Valuation valuation,
+ const LogicInfo& logicInfo,
+ ProofNodeManager* pnm,
+ std::string name)
+ : Theory(THEORY_BV, c, u, out, valuation, logicInfo, pnm, name),
+ d_internal(nullptr),
+ d_ufDivByZero(),
+ d_ufRemByZero(),
+ d_rewriter(),
+ d_state(c, u, valuation),
+ d_im(*this, d_state, nullptr),
+ d_notify(d_im)
{
+ switch (options::bvSolver())
+ {
+ case options::BVSolver::BITBLAST:
+ d_internal.reset(new BVSolverBitblast(&d_state, d_im, pnm));
+ break;
+
+ case options::BVSolver::LAZY:
+ d_internal.reset(new BVSolverLazy(*this, c, u, pnm, name));
+ break;
+
+ default:
+ AlwaysAssert(options::bvSolver() == options::BVSolver::SIMPLE);
+ d_internal.reset(new BVSolverSimple(&d_state, d_im, pnm));
+ }
+ d_theoryState = &d_state;
+ d_inferManager = &d_im;
+}
- if (options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER) {
- d_eagerSolver = new EagerBitblastSolver(this);
- return;
- }
+TheoryBV::~TheoryBV() {}
- if (options::bitvectorEqualitySolver()) {
- SubtheorySolver* core_solver = new CoreSolver(c, this);
- d_subtheories.push_back(core_solver);
- d_subtheoryMap[SUB_CORE] = core_solver;
- }
+TheoryRewriter* TheoryBV::getTheoryRewriter() { return &d_rewriter; }
- if (options::bitvectorInequalitySolver()) {
- SubtheorySolver* ineq_solver = new InequalitySolver(c, this);
- d_subtheories.push_back(ineq_solver);
- d_subtheoryMap[SUB_INEQUALITY] = ineq_solver;
- }
+bool TheoryBV::needsEqualityEngine(EeSetupInfo& esi)
+{
+ bool need_ee = d_internal->needsEqualityEngine(esi);
- if (options::bitvectorAlgebraicSolver()) {
- SubtheorySolver* alg_solver = new AlgebraicSolver(c, this);
- d_subtheories.push_back(alg_solver);
- d_subtheoryMap[SUB_ALGEBRAIC] = alg_solver;
+ /* 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";
}
- BitblastSolver* bb_solver = new BitblastSolver(c, this);
- if (options::bvAbstraction()) {
- bb_solver->setAbstraction(d_abstractionModule);
- }
- d_subtheories.push_back(bb_solver);
- d_subtheoryMap[SUB_BITBLAST] = bb_solver;
+ return need_ee;
}
-
-TheoryBV::~TheoryBV() {
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- delete d_subtheories[i];
- }
- delete d_abstractionModule;
-}
-
-void TheoryBV::setMasterEqualityEngine(eq::EqualityEngine* eq) {
- if (options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER) {
- return;
- }
- if (options::bitvectorEqualitySolver()) {
- dynamic_cast<CoreSolver*>(d_subtheoryMap[SUB_CORE])->setMasterEqualityEngine(eq);
+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_PLUS, 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::spendResource(unsigned ammount) throw(UnsafeInterruptException) {
- getOutputChannel().spendResource(ammount);
-}
-
-TheoryBV::Statistics::Statistics():
- d_avgConflictSize("theory::bv::AvgBVConflictSize"),
- d_solveSubstitutions("theory::bv::NumberOfSolveSubstitutions", 0),
- d_solveTimer("theory::bv::solveTimer"),
- d_numCallsToCheckFullEffort("theory::bv::NumberOfFullCheckCalls", 0),
- d_numCallsToCheckStandardEffort("theory::bv::NumberOfStandardCheckCalls", 0),
- d_weightComputationTimer("theory::bv::weightComputationTimer"),
- d_numMultSlice("theory::bv::NumMultSliceApplied", 0)
+Node TheoryBV::getUFDivByZero(Kind k, unsigned width)
{
- StatisticsRegistry::registerStat(&d_avgConflictSize);
- StatisticsRegistry::registerStat(&d_solveSubstitutions);
- StatisticsRegistry::registerStat(&d_solveTimer);
- StatisticsRegistry::registerStat(&d_numCallsToCheckFullEffort);
- StatisticsRegistry::registerStat(&d_numCallsToCheckStandardEffort);
- StatisticsRegistry::registerStat(&d_weightComputationTimer);
- StatisticsRegistry::registerStat(&d_numMultSlice);
-}
-
-TheoryBV::Statistics::~Statistics() {
- StatisticsRegistry::unregisterStat(&d_avgConflictSize);
- StatisticsRegistry::unregisterStat(&d_solveSubstitutions);
- StatisticsRegistry::unregisterStat(&d_solveTimer);
- StatisticsRegistry::unregisterStat(&d_numCallsToCheckFullEffort);
- StatisticsRegistry::unregisterStat(&d_numCallsToCheckStandardEffort);
- StatisticsRegistry::unregisterStat(&d_weightComputationTimer);
- StatisticsRegistry::unregisterStat(&d_numMultSlice);
-}
-
-Node TheoryBV::getBVDivByZero(Kind k, unsigned width) {
NodeManager* nm = NodeManager::currentNM();
- if (k == kind::BITVECTOR_UDIV) {
- if (d_BVDivByZero.find(width) == d_BVDivByZero.end()) {
+ if (k == kind::BITVECTOR_UDIV)
+ {
+ if (d_ufDivByZero.find(width) == d_ufDivByZero.end())
+ {
// lazily create the function symbols
- ostringstream os;
+ std::ostringstream os;
os << "BVUDivByZero_" << width;
- Node divByZero = nm->mkSkolem(os.str(),
- nm->mkFunctionType(nm->mkBitVectorType(width), nm->mkBitVectorType(width)),
- "partial bvudiv", NodeManager::SKOLEM_EXACT_NAME);
- d_BVDivByZero[width] = divByZero;
+ Node divByZero =
+ nm->mkSkolem(os.str(),
+ nm->mkFunctionType(nm->mkBitVectorType(width),
+ nm->mkBitVectorType(width)),
+ "partial bvudiv",
+ NodeManager::SKOLEM_EXACT_NAME);
+ d_ufDivByZero[width] = divByZero;
}
- return d_BVDivByZero[width];
+ return d_ufDivByZero[width];
}
- else if (k == kind::BITVECTOR_UREM) {
- if (d_BVRemByZero.find(width) == d_BVRemByZero.end()) {
- ostringstream os;
+ else if (k == kind::BITVECTOR_UREM)
+ {
+ if (d_ufRemByZero.find(width) == d_ufRemByZero.end())
+ {
+ std::ostringstream os;
os << "BVURemByZero_" << width;
- Node divByZero = nm->mkSkolem(os.str(),
- nm->mkFunctionType(nm->mkBitVectorType(width), nm->mkBitVectorType(width)),
- "partial bvurem", NodeManager::SKOLEM_EXACT_NAME);
- d_BVRemByZero[width] = divByZero;
+ Node divByZero =
+ nm->mkSkolem(os.str(),
+ nm->mkFunctionType(nm->mkBitVectorType(width),
+ nm->mkBitVectorType(width)),
+ "partial bvurem",
+ NodeManager::SKOLEM_EXACT_NAME);
+ d_ufRemByZero[width] = divByZero;
}
- return d_BVRemByZero[width];
+ return d_ufRemByZero[width];
}
Unreachable();
}
+TrustNode TheoryBV::expandDefinition(Node node)
+{
+ Debug("bitvector-expandDefinition")
+ << "TheoryBV::expandDefinition(" << node << ")" << std::endl;
+
+ Node ret;
+ switch (node.getKind())
+ {
+ case kind::BITVECTOR_SDIV:
+ case kind::BITVECTOR_SREM:
+ case kind::BITVECTOR_SMOD:
+ ret = TheoryBVRewriter::eliminateBVSDiv(node);
+ break;
+
+ case kind::BITVECTOR_UDIV:
+ case kind::BITVECTOR_UREM:
+ {
+ NodeManager* nm = NodeManager::currentNM();
-void TheoryBV::collectNumerators(TNode term, TNodeSet& seen) {
- if (seen.find(term) != seen.end())
- return;
- if (term.getKind() == kind::BITVECTOR_ACKERMANIZE_UDIV) {
- unsigned size = utils::getSize(term[0]);
- if (d_BVDivByZeroAckerman.find(size) == d_BVDivByZeroAckerman.end()) {
- d_BVDivByZeroAckerman[size] = TNodeSet();
- }
- d_BVDivByZeroAckerman[size].insert(term[0]);
- seen.insert(term);
- } else if (term.getKind() == kind::BITVECTOR_ACKERMANIZE_UREM) {
- unsigned size = utils::getSize(term[0]);
- if (d_BVRemByZeroAckerman.find(size) == d_BVRemByZeroAckerman.end()) {
- d_BVRemByZeroAckerman[size] = TNodeSet();
- }
- d_BVRemByZeroAckerman[size].insert(term[0]);
- seen.insert(term);
- }
- for (unsigned i = 0; i < term.getNumChildren(); ++i) {
- collectNumerators(term[i], seen);
- }
- seen.insert(term);
-}
-
-void TheoryBV::mkAckermanizationAsssertions(std::vector<Node>& assertions) {
- Debug("bv-ackermanize") << "TheoryBV::mkAckermanizationAsssertions\n";
-
- Assert(options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER);
- AlwaysAssert(!options::incrementalSolving());
- TNodeSet seen;
- for (unsigned i = 0; i < assertions.size(); ++i) {
- collectNumerators(assertions[i], seen);
- }
-
- // process division UF
- Debug("bv-ackermanize") << "Process division UF...\n";
- for (WidthToNumerators::const_iterator it = d_BVDivByZeroAckerman.begin(); it != d_BVDivByZeroAckerman.end(); ++it) {
- const TNodeSet& numerators= it->second;
- for (TNodeSet::const_iterator i = numerators.begin(); i != numerators.end(); ++i) {
- TNodeSet::const_iterator j = i;
- j++;
- for (; j != numerators.end(); ++j) {
- TNode arg1 = *i;
- TNode arg2 = *j;
- TNode acker1 = utils::mkNode(kind::BITVECTOR_ACKERMANIZE_UDIV, arg1);
- TNode acker2 = utils::mkNode(kind::BITVECTOR_ACKERMANIZE_UDIV, arg2);
-
- Node arg_eq = utils::mkNode(kind::EQUAL, arg1, arg2);
- Node acker_eq = utils::mkNode(kind::EQUAL, acker1, acker2);
- Node lemma = utils::mkNode(kind::IMPLIES, arg_eq, acker_eq);
- Debug("bv-ackermanize") << " " << lemma << "\n";
- assertions.push_back(lemma);
- }
- }
- }
- // process remainder UF
- Debug("bv-ackermanize") << "Process remainder UF...\n";
- for (WidthToNumerators::const_iterator it = d_BVRemByZeroAckerman.begin(); it != d_BVRemByZeroAckerman.end(); ++it) {
- const TNodeSet& numerators= it->second;
- for (TNodeSet::const_iterator i = numerators.begin(); i != numerators.end(); ++i) {
- TNodeSet::const_iterator j = i;
- j++;
- for (; j != numerators.end(); ++j) {
- TNode arg1 = *i;
- TNode arg2 = *j;
- TNode acker1 = utils::mkNode(kind::BITVECTOR_ACKERMANIZE_UREM, arg1);
- TNode acker2 = utils::mkNode(kind::BITVECTOR_ACKERMANIZE_UREM, arg2);
-
- Node arg_eq = utils::mkNode(kind::EQUAL, arg1, arg2);
- Node acker_eq = utils::mkNode(kind::EQUAL, acker1, acker2);
- Node lemma = utils::mkNode(kind::IMPLIES, arg_eq, acker_eq);
- Debug("bv-ackermanize") << " " << lemma << "\n";
- assertions.push_back(lemma);
- }
- }
- }
-}
-
-Node TheoryBV::expandDefinition(LogicRequest &logicRequest, Node node) {
- Debug("bitvector-expandDefinition") << "TheoryBV::expandDefinition(" << node << ")" << std::endl;
-
- switch (node.getKind()) {
- case kind::BITVECTOR_SDIV:
- case kind::BITVECTOR_SREM:
- case kind::BITVECTOR_SMOD:
- return TheoryBVRewriter::eliminateBVSDiv(node);
- break;
-
- case kind::BITVECTOR_UDIV:
- case kind::BITVECTOR_UREM: {
- NodeManager* nm = NodeManager::currentNM();
- unsigned width = node.getType().getBitVectorSize();
-
- if (options::bitvectorDivByZeroConst()) {
- Kind kind = node.getKind() == kind::BITVECTOR_UDIV ? kind::BITVECTOR_UDIV_TOTAL : kind::BITVECTOR_UREM_TOTAL;
- return nm->mkNode(kind, node[0], node[1]);
- }
-
- TNode num = node[0], den = node[1];
- Node den_eq_0 = nm->mkNode(kind::EQUAL, den, nm->mkConst(BitVector(width, Integer(0))));
- Node divTotalNumDen = nm->mkNode(node.getKind() == kind::BITVECTOR_UDIV ? kind::BITVECTOR_UDIV_TOTAL :
- kind::BITVECTOR_UREM_TOTAL, num, den);
-
- if (options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER) {
- // Ackermanize UF if using eager bit-blasting
- Node ackerman_var = nm->mkNode(node.getKind() == kind::BITVECTOR_UDIV ? kind::BITVECTOR_ACKERMANIZE_UDIV : kind::BITVECTOR_ACKERMANIZE_UREM, num);
- node = nm->mkNode(kind::ITE, den_eq_0, ackerman_var, divTotalNumDen);
- return node;
- } else {
- Node divByZero = getBVDivByZero(node.getKind(), width);
- Node divByZeroNum = nm->mkNode(kind::APPLY_UF, divByZero, num);
- node = nm->mkNode(kind::ITE, den_eq_0, divByZeroNum, divTotalNumDen);
- logicRequest.widenLogic(THEORY_UF);
- return node;
+ Kind kind = node.getKind() == kind::BITVECTOR_UDIV
+ ? kind::BITVECTOR_UDIV_TOTAL
+ : kind::BITVECTOR_UREM_TOTAL;
+ ret = nm->mkNode(kind, node[0], node[1]);
+ break;
}
- }
break;
- default:
- return node;
- break;
+ default: break;
}
-
- Unreachable();
-}
-
-
-void TheoryBV::preRegisterTerm(TNode node) {
- d_calledPreregister = true;
- Debug("bitvector-preregister") << "TheoryBV::preRegister(" << node << ")" << std::endl;
-
- if (options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER) {
- // the aig bit-blaster option is set heuristically
- // if bv abstraction is not used
- if (!d_eagerSolver->isInitialized()) {
- d_eagerSolver->initialize();
- }
-
- if (node.getKind() == kind::BITVECTOR_EAGER_ATOM) {
- Node formula = node[0];
- d_eagerSolver->assertFormula(formula);
- }
- // nothing to do for the other terms
- return;
- }
-
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- d_subtheories[i]->preRegister(node);
+ if (!ret.isNull() && node != ret)
+ {
+ return TrustNode::mkTrustRewrite(node, ret, nullptr);
}
+ return TrustNode::null();
}
-void TheoryBV::sendConflict() {
- Assert(d_conflict);
- if (d_conflictNode.isNull()) {
- return;
- } else {
- Debug("bitvector") << indent() << "TheoryBV::check(): conflict " << d_conflictNode;
- d_out->conflict(d_conflictNode);
- d_statistics.d_avgConflictSize.addEntry(d_conflictNode.getNumChildren());
- d_conflictNode = Node::null();
- }
-}
-
-void TheoryBV::checkForLemma(TNode fact) {
- if (fact.getKind() == kind::EQUAL) {
- if (fact[0].getKind() == kind::BITVECTOR_UREM_TOTAL) {
- TNode urem = fact[0];
- TNode result = fact[1];
- TNode divisor = urem[1];
- Node result_ult_div = mkNode(kind::BITVECTOR_ULT, result, divisor);
- Node divisor_eq_0 = mkNode(kind::EQUAL,
- divisor,
- mkConst(BitVector(getSize(divisor), 0u)));
- Node split = utils::mkNode(kind::OR, divisor_eq_0, mkNode(kind::NOT, fact), result_ult_div);
- lemma(split);
- }
- if (fact[1].getKind() == kind::BITVECTOR_UREM_TOTAL) {
- TNode urem = fact[1];
- TNode result = fact[0];
- TNode divisor = urem[1];
- Node result_ult_div = mkNode(kind::BITVECTOR_ULT, result, divisor);
- Node divisor_eq_0 = mkNode(kind::EQUAL,
- divisor,
- mkConst(BitVector(getSize(divisor), 0u)));
- Node split = utils::mkNode(kind::OR, divisor_eq_0, mkNode(kind::NOT, fact), result_ult_div);
- lemma(split);
- }
- }
-}
-
-
-void TheoryBV::check(Effort e)
+void TheoryBV::preRegisterTerm(TNode node)
{
- if (done() && !fullEffort(e)) {
- return;
- }
- TimerStat::CodeTimer checkTimer(d_checkTime);
- Debug("bitvector") << "TheoryBV::check(" << e << ")" << std::endl;
- TimerStat::CodeTimer codeTimer(d_statistics.d_solveTimer);
- // we may be getting new assertions so the model cache may not be sound
- d_invalidateModelCache.set(true);
- // if we are using the eager solver
- if (options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER) {
- // this can only happen on an empty benchmark
- if (!d_eagerSolver->isInitialized()) {
- d_eagerSolver->initialize();
- }
- if (!Theory::fullEffort(e))
- return;
-
- std::vector<TNode> assertions;
- while (!done()) {
- TNode fact = get().assertion;
- Assert (fact.getKind() == kind::BITVECTOR_EAGER_ATOM);
- assertions.push_back(fact);
- }
- Assert (d_eagerSolver->hasAssertions(assertions));
-
- bool ok = d_eagerSolver->checkSat();
- if (!ok) {
- if (assertions.size() == 1) {
- d_out->conflict(assertions[0]);
- return;
- }
- Node conflict = NodeManager::currentNM()->mkNode(kind::AND, assertions);
- d_out->conflict(conflict);
- return;
- }
- return;
- }
-
-
- if (Theory::fullEffort(e)) {
- ++(d_statistics.d_numCallsToCheckFullEffort);
- } else {
- ++(d_statistics.d_numCallsToCheckStandardEffort);
- }
- // if we are already in conflict just return the conflict
- if (inConflict()) {
- sendConflict();
- return;
- }
+ d_internal->preRegisterTerm(node);
- while (!done()) {
- TNode fact = get().assertion;
-
- checkForLemma(fact);
-
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- d_subtheories[i]->assertFact(fact);
- }
- }
-
- bool ok = true;
- bool complete = false;
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- Assert (!inConflict());
- ok = d_subtheories[i]->check(e);
- complete = d_subtheories[i]->isComplete();
-
- if (!ok) {
- // if we are in a conflict no need to check with other theories
- Assert (inConflict());
- sendConflict();
- return;
- }
- if (complete) {
- // if the last subtheory was complete we stop
- return;
- }
- }
-}
-
-void TheoryBV::collectModelInfo( TheoryModel* m, bool fullModel ){
- Assert(!inConflict());
- if (options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER) {
- d_eagerSolver->collectModelInfo(m, fullModel);
- }
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- if (d_subtheories[i]->isComplete()) {
- d_subtheories[i]->collectModelInfo(m, fullModel);
- return;
- }
- }
-}
-
-Node TheoryBV::getModelValue(TNode var) {
- Assert(!inConflict());
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- if (d_subtheories[i]->isComplete()) {
- return d_subtheories[i]->getModelValue(var);
+ eq::EqualityEngine* ee = getEqualityEngine();
+ if (ee)
+ {
+ if (node.getKind() == kind::EQUAL)
+ {
+ ee->addTriggerPredicate(node);
}
- }
- Unreachable();
-}
-
-void TheoryBV::propagate(Effort e) {
- Debug("bitvector") << indent() << "TheoryBV::propagate()" << std::endl;
- if (options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER) {
- return;
- }
-
- if (inConflict()) {
- return;
- }
-
- // go through stored propagations
- bool ok = true;
- for (; d_literalsToPropagateIndex < d_literalsToPropagate.size() && ok; d_literalsToPropagateIndex = d_literalsToPropagateIndex + 1) {
- TNode literal = d_literalsToPropagate[d_literalsToPropagateIndex];
- // temporary fix for incremental bit-blasting
- if (d_valuation.isSatLiteral(literal)) {
- Debug("bitvector::propagate") << "TheoryBV:: propagating " << literal <<"\n";
- ok = d_out->propagate(literal);
+ else
+ {
+ ee->addTerm(node);
}
}
-
- if (!ok) {
- Debug("bitvector::propagate") << indent() << "TheoryBV::propagate(): conflict from theory engine" << std::endl;
- setConflict();
- }
}
+bool TheoryBV::preCheck(Effort e) { return d_internal->preCheck(e); }
-Theory::PPAssertStatus TheoryBV::ppAssert(TNode in, SubstitutionMap& outSubstitutions) {
- switch(in.getKind()) {
- case kind::EQUAL:
- {
- if (in[0].isVar() && !in[1].hasSubterm(in[0])) {
- ++(d_statistics.d_solveSubstitutions);
- outSubstitutions.addSubstitution(in[0], in[1]);
- return PP_ASSERT_STATUS_SOLVED;
- }
- if (in[1].isVar() && !in[0].hasSubterm(in[1])) {
- ++(d_statistics.d_solveSubstitutions);
- outSubstitutions.addSubstitution(in[1], in[0]);
- return PP_ASSERT_STATUS_SOLVED;
- }
- Node node = Rewriter::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].getKind() == kind::VARIABLE) {
- Node c = node[0].isConst() ? node[0] : node[1];
-
- unsigned high = utils::getExtractHigh(extract);
- unsigned low = utils::getExtractLow(extract);
- unsigned var_bitwidth = utils::getSize(extract[0]);
- std::vector<Node> children;
-
- if (low == 0) {
- Assert (high != var_bitwidth - 1);
- unsigned skolem_size = var_bitwidth - high - 1;
- Node skolem = utils::mkVar(skolem_size);
- children.push_back(skolem);
- children.push_back(c);
- } else if (high == var_bitwidth - 1) {
- unsigned skolem_size = low;
- Node skolem = utils::mkVar(skolem_size);
- children.push_back(c);
- children.push_back(skolem);
- } else {
- unsigned skolem1_size = low;
- unsigned skolem2_size = var_bitwidth - high - 1;
- Node skolem1 = utils::mkVar(skolem1_size);
- Node skolem2 = utils::mkVar(skolem2_size);
- children.push_back(skolem2);
- children.push_back(c);
- children.push_back(skolem1);
- }
- Node concat = utils::mkNode(kind::BITVECTOR_CONCAT, children);
- Assert (utils::getSize(concat) == utils::getSize(extract[0]));
- outSubstitutions.addSubstitution(extract[0], concat);
- return PP_ASSERT_STATUS_SOLVED;
- }
- }
- }
- break;
- case kind::BITVECTOR_ULT:
- case kind::BITVECTOR_SLT:
- case kind::BITVECTOR_ULE:
- case kind::BITVECTOR_SLE:
+void TheoryBV::postCheck(Effort e) { d_internal->postCheck(e); }
- default:
- // TODO other predicates
- break;
- }
- return PP_ASSERT_STATUS_UNSOLVED;
+bool TheoryBV::preNotifyFact(
+ TNode atom, bool pol, TNode fact, bool isPrereg, bool isInternal)
+{
+ return d_internal->preNotifyFact(atom, pol, fact, isPrereg, isInternal);
}
-Node TheoryBV::ppRewrite(TNode t)
+void TheoryBV::notifyFact(TNode atom, bool pol, TNode fact, bool isInternal)
{
- Debug("bv-pp-rewrite") << "TheoryBV::ppRewrite " << t << "\n";
- Node res = t;
- if (RewriteRule<BitwiseEq>::applies(t)) {
- Node result = RewriteRule<BitwiseEq>::run<false>(t);
- res = Rewriter::rewrite(result);
- } else if (d_isCoreTheory && t.getKind() == kind::EQUAL) {
- std::vector<Node> equalities;
- Slicer::splitEqualities(t, equalities);
- res = utils::mkAnd(equalities);
- } else if (RewriteRule<UltPlusOne>::applies(t)) {
- Node result = RewriteRule<UltPlusOne>::run<false>(t);
- res = Rewriter::rewrite(result);
- } else if( res.getKind() == kind::EQUAL &&
- ((res[0].getKind() == kind::BITVECTOR_PLUS &&
- RewriteRule<ConcatToMult>::applies(res[1])) ||
- (res[1].getKind() == kind::BITVECTOR_PLUS &&
- RewriteRule<ConcatToMult>::applies(res[0])))) {
- Node mult = RewriteRule<ConcatToMult>::applies(res[0])?
- RewriteRule<ConcatToMult>::run<false>(res[0]) :
- RewriteRule<ConcatToMult>::run<true>(res[1]);
- Node factor = mult[0];
- Node sum = RewriteRule<ConcatToMult>::applies(res[0])? res[1] : res[0];
- Node new_eq =utils::mkNode(kind::EQUAL, sum, mult);
- Node rewr_eq = RewriteRule<SolveEq>::run<true>(new_eq);
- if (rewr_eq[0].isVar() || rewr_eq[1].isVar()){
- res = Rewriter::rewrite(rewr_eq);
- } else {
- res = t;
- }
- }
-
-
- // if(t.getKind() == kind::EQUAL &&
- // ((t[0].getKind() == kind::BITVECTOR_MULT && t[1].getKind() == kind::BITVECTOR_PLUS) ||
- // (t[1].getKind() == kind::BITVECTOR_MULT && t[0].getKind() == kind::BITVECTOR_PLUS))) {
- // // if we have an equality between a multiplication and addition
- // // try to express multiplication in terms of addition
- // Node mult = t[0].getKind() == kind::BITVECTOR_MULT? t[0] : t[1];
- // Node add = t[0].getKind() == kind::BITVECTOR_PLUS? t[0] : t[1];
- // if (RewriteRule<MultSlice>::applies(mult)) {
- // Node new_mult = RewriteRule<MultSlice>::run<false>(mult);
- // Node new_eq = Rewriter::rewrite(utils::mkNode(kind::EQUAL, new_mult, add));
-
- // // the simplification can cause the formula to blow up
- // // only apply if formula reduced
- // if (d_subtheoryMap.find(SUB_BITBLAST) != d_subtheoryMap.end()) {
- // BitblastSolver* bv = (BitblastSolver*)d_subtheoryMap[SUB_BITBLAST];
- // uint64_t old_size = bv->computeAtomWeight(t);
- // Assert (old_size);
- // uint64_t new_size = bv->computeAtomWeight(new_eq);
- // double ratio = ((double)new_size)/old_size;
- // if (ratio <= 0.4) {
- // ++(d_statistics.d_numMultSlice);
- // return new_eq;
- // }
- // }
-
- // if (new_eq.getKind() == kind::CONST_BOOLEAN) {
- // ++(d_statistics.d_numMultSlice);
- // return new_eq;
- // }
- // }
- // }
-
- if (options::bvAbstraction() && t.getType().isBoolean()) {
- d_abstractionModule->addInputAtom(res);
- }
- Debug("bv-pp-rewrite") << "to " << res << "\n";
- return res;
+ d_internal->notifyFact(atom, pol, fact, isInternal);
}
-void TheoryBV::presolve() {
- Debug("bitvector") << "TheoryBV::presolve" << endl;
+bool TheoryBV::needsCheckLastEffort()
+{
+ return d_internal->needsCheckLastEffort();
}
-static int prop_count = 0;
-
-bool TheoryBV::storePropagation(TNode literal, SubTheory subtheory)
+bool TheoryBV::collectModelValues(TheoryModel* m, const std::set<Node>& termSet)
{
- Debug("bitvector::propagate") << indent() << getSatContext()->getLevel() << " " << "TheoryBV::storePropagation(" << literal << ", " << subtheory << ")" << std::endl;
- prop_count++;
-
- // If already in conflict, no more propagation
- if (d_conflict) {
- Debug("bitvector::propagate") << indent() << "TheoryBV::storePropagation(" << literal << ", " << subtheory << "): already in conflict" << std::endl;
- return false;
- }
-
- // If propagated already, just skip
- PropagatedMap::const_iterator find = d_propagatedBy.find(literal);
- if (find != d_propagatedBy.end()) {
- return true;
- } else {
- bool polarity = literal.getKind() != kind::NOT;
- Node negatedLiteral = polarity ? literal.notNode() : (Node) literal[0];
- find = d_propagatedBy.find(negatedLiteral);
- if (find != d_propagatedBy.end() && (*find).second != subtheory) {
- // Safe to ignore this one, subtheory should produce a conflict
- return true;
- }
-
- d_propagatedBy[literal] = subtheory;
- }
-
- // Propagate differs depending on the subtheory
- // * bitblaster needs to be left alone until it's done, otherwise it doesn't know how to explain
- // * equality engine can propagate eagerly
- bool ok = true;
- if (subtheory == SUB_CORE) {
- d_out->propagate(literal);
- if (!ok) {
- setConflict();
- }
- } else {
- d_literalsToPropagate.push_back(literal);
- }
- return ok;
-
-}/* TheoryBV::propagate(TNode) */
-
-
-void TheoryBV::explain(TNode literal, std::vector<TNode>& assumptions) {
- Assert (wasPropagatedBySubtheory(literal));
- SubTheory sub = getPropagatingSubtheory(literal);
- d_subtheoryMap[sub]->explain(literal, assumptions);
+ return d_internal->collectModelValues(m, termSet);
}
+void TheoryBV::propagate(Effort e) { return d_internal->propagate(e); }
-Node TheoryBV::explain(TNode node) {
- Debug("bitvector::explain") << "TheoryBV::explain(" << node << ")" << std::endl;
- std::vector<TNode> assumptions;
-
- // Ask for the explanation
- explain(node, assumptions);
- // this means that it is something true at level 0
- if (assumptions.size() == 0) {
- return utils::mkTrue();
- }
- // return the explanation
- Node explanation = utils::mkAnd(assumptions);
- Debug("bitvector::explain") << "TheoryBV::explain(" << node << ") => " << explanation << std::endl;
- return explanation;
+Theory::PPAssertStatus TheoryBV::ppAssert(
+ TrustNode tin, TrustSubstitutionMap& outSubstitutions)
+{
+ return d_internal->ppAssert(tin, outSubstitutions);
}
-
-void TheoryBV::addSharedTerm(TNode t) {
- Debug("bitvector::sharing") << indent() << "TheoryBV::addSharedTerm(" << t << ")" << std::endl;
- d_sharedTermsSet.insert(t);
- if (options::bitvectorEqualitySolver()) {
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- d_subtheories[i]->addSharedTerm(t);
- }
+TrustNode TheoryBV::ppRewrite(TNode t)
+{
+ // first, see if we need to expand definitions
+ TrustNode texp = 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)
{
- Assert (options::bitblastMode() == theory::bv::BITBLAST_MODE_LAZY);
- for (unsigned i = 0; i < d_subtheories.size(); ++i) {
- EqualityStatus status = d_subtheories[i]->getEqualityStatus(a, b);
- if (status != EQUALITY_UNKNOWN) {
- return status;
- }
- }
- return EQUALITY_UNKNOWN; ;
+ return d_internal->getEqualityStatus(a, b);
}
+TrustNode TheoryBV::explain(TNode node) { return d_internal->explain(node); }
-void TheoryBV::enableCoreTheorySlicer() {
- Assert (!d_calledPreregister);
- d_isCoreTheory = true;
- if (d_subtheoryMap.find(SUB_CORE) != d_subtheoryMap.end()) {
- CoreSolver* core = (CoreSolver*)d_subtheoryMap[SUB_CORE];
- core->enableSlicer();
- }
-}
-
-
-void TheoryBV::ppStaticLearn(TNode in, NodeBuilder<>& learned) {
- if(d_staticLearnCache.find(in) != d_staticLearnCache.end()){
- return;
- }
- d_staticLearnCache.insert(in);
-
- if (in.getKind() == kind::EQUAL) {
- if((in[0].getKind() == kind::BITVECTOR_PLUS && in[1].getKind() == kind::BITVECTOR_SHL) ||
- (in[1].getKind() == kind::BITVECTOR_PLUS && in[0].getKind() == kind::BITVECTOR_SHL)) {
- TNode p = in[0].getKind() == kind::BITVECTOR_PLUS ? in[0] : in[1];
- TNode s = in[0].getKind() == kind::BITVECTOR_PLUS ? in[1] : in[0];
-
- if(p.getNumChildren() == 2
- && p[0].getKind() == kind::BITVECTOR_SHL
- && p[1].getKind() == kind::BITVECTOR_SHL ){
- unsigned size = utils::getSize(s);
- Node one = utils::mkConst(size, 1u);
- if(s[0] == one && p[0][0] == one && p[1][0] == one){
- Node zero = utils::mkConst(size, 0u);
- TNode b = p[0];
- TNode c = p[1];
- // (s : 1 << S) = (b : 1 << B) + (c : 1 << C)
- Node b_eq_0 = b.eqNode(zero);
- Node c_eq_0 = c.eqNode(zero);
- Node b_eq_c = b.eqNode(c);
-
- Node dis = utils::mkNode(kind::OR, b_eq_0, c_eq_0, b_eq_c);
- Node imp = in.impNode(dis);
- learned << imp;
- }
- }
- }
- }else if(in.getKind() == kind::AND){
- for(size_t i = 0, N = in.getNumChildren(); i < N; ++i){
- ppStaticLearn(in[i], learned);
- }
- }
+void TheoryBV::notifySharedTerm(TNode t)
+{
+ d_internal->notifySharedTerm(t);
}
-bool TheoryBV::applyAbstraction(const std::vector<Node>& assertions, std::vector<Node>& new_assertions) {
- bool changed = d_abstractionModule->applyAbstraction(assertions, new_assertions);
- if (changed &&
- options::bitblastMode() == theory::bv::BITBLAST_MODE_EAGER &&
- options::bitvectorAig()) {
- // disable AIG mode
- AlwaysAssert (!d_eagerSolver->isInitialized());
- d_eagerSolver->turnOffAig();
- d_eagerSolver->initialize();
- }
- return changed;
+void TheoryBV::ppStaticLearn(TNode in, NodeBuilder<>& learned)
+{
+ d_internal->ppStaticLearn(in, learned);
}
-void TheoryBV::setConflict(Node conflict) {
- if (options::bvAbstraction()) {
- Node new_conflict = d_abstractionModule->simplifyConflict(conflict);
-
- std::vector<Node> lemmas;
- lemmas.push_back(new_conflict);
- d_abstractionModule->generalizeConflict(new_conflict, lemmas);
- for (unsigned i = 0; i < lemmas.size(); ++i) {
- lemma(utils::mkNode(kind::NOT, lemmas[i]));
- }
- }
- d_conflict = true;
- d_conflictNode = conflict;
+bool TheoryBV::applyAbstraction(const std::vector<Node>& assertions,
+ std::vector<Node>& new_assertions)
+{
+ return d_internal->applyAbstraction(assertions, new_assertions);
}
-} /* namespace CVC4::theory::bv */
-} /* namespace CVC4::theory */
-} /* namespace CVC4 */
+} // namespace bv
+} // namespace theory
+} // namespace CVC4
projects / cvc5.git / blobdiff