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/****************************************************************************** |
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* Top contributors (to current version): |
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* Mathias Preiner, Andrew Reynolds |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Bit-blasting solver that supports multiple SAT back ends. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__THEORY__BV__BV_SOLVER_BITBLAST_H |
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#define CVC5__THEORY__BV__BV_SOLVER_BITBLAST_H |
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#include <unordered_map> |
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#include "context/cdqueue.h" |
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#include "proof/eager_proof_generator.h" |
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#include "prop/cnf_stream.h" |
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#include "prop/sat_solver.h" |
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#include "smt/env_obj.h" |
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#include "theory/bv/bitblast/node_bitblaster.h" |
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#include "theory/bv/bv_solver.h" |
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#include "theory/bv/proof_checker.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace bv { |
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class NotifyResetAssertions; |
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class BBRegistrar; |
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/** |
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* Bit-blasting solver with support for different SAT back ends. |
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*/ |
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class BVSolverBitblast : public BVSolver |
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{ |
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public: |
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BVSolverBitblast(Env& env, |
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TheoryState* state, |
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TheoryInferenceManager& inferMgr, |
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ProofNodeManager* pnm); |
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~BVSolverBitblast() = default; |
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bool needsEqualityEngine(EeSetupInfo& esi) override { return true; } |
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void preRegisterTerm(TNode n) override {} |
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void postCheck(Theory::Effort level) override; |
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bool preNotifyFact(TNode atom, |
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bool pol, |
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TNode fact, |
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bool isPrereg, |
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bool isInternal) override; |
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TrustNode explain(TNode n) override; |
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std::string identify() const override { return "BVSolverBitblast"; }; |
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void computeRelevantTerms(std::set<Node>& termSet) override; |
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bool collectModelValues(TheoryModel* m, |
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const std::set<Node>& termSet) override; |
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/** |
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* Get the current value of `node`. |
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* |
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* The `initialize` flag indicates whether bits should be zero-initialized |
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* if they were not bit-blasted yet. |
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*/ |
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Node getValue(TNode node, bool initialize) override; |
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private: |
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/** Initialize SAT solver and CNF stream. */ |
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void initSatSolver(); |
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/** |
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* Handle BITVECTOR_EAGER_ATOM atoms and assert/assume to CnfStream. |
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* |
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* @param assertFact: Indicates whether the fact should be asserted (true) or |
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* assumed (false). |
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*/ |
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void handleEagerAtom(TNode fact, bool assertFact); |
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/** Bit-blaster used to bit-blast atoms/terms. */ |
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std::unique_ptr<NodeBitblaster> d_bitblaster; |
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/** Used for initializing `d_cnfStream`. */ |
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std::unique_ptr<BBRegistrar> d_bbRegistrar; |
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std::unique_ptr<context::Context> d_nullContext; |
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/** SAT solver back end (configured via options::bvSatSolver. */ |
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std::unique_ptr<prop::SatSolver> d_satSolver; |
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/** CNF stream. */ |
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std::unique_ptr<prop::CnfStream> d_cnfStream; |
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/** |
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* Bit-blast queue for facts sent to this solver. |
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* |
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* Gets populated on preNotifyFact(). |
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*/ |
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context::CDQueue<Node> d_bbFacts; |
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/** |
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* Bit-blast queue for user-level 0 input facts sent to this solver. |
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* |
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* Get populated on preNotifyFact(). |
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*/ |
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context::CDQueue<Node> d_bbInputFacts; |
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/** Corresponds to the SAT literals of the currently asserted facts. */ |
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context::CDList<prop::SatLiteral> d_assumptions; |
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/** Stores the current input assertions. */ |
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context::CDList<Node> d_assertions; |
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/** Proof generator that manages proofs for lemmas generated by this class. */ |
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std::unique_ptr<EagerProofGenerator> d_epg; |
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BVProofRuleChecker d_bvProofChecker; |
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/** Stores the SatLiteral for a given fact. */ |
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context::CDHashMap<Node, prop::SatLiteral> d_factLiteralCache; |
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/** Reverse map of `d_factLiteralCache`. */ |
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context::CDHashMap<prop::SatLiteral, Node, prop::SatLiteralHashFunction> |
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d_literalFactCache; |
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/** Option to enable/disable bit-level propagation. */ |
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bool d_propagate; |
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/** Notifies when reset-assertion was called. */ |
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std::unique_ptr<NotifyResetAssertions> d_resetNotify; |
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}; |
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} // namespace bv |
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} // namespace theory |
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} // namespace cvc5 |
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#endif |