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/********************* */
/*! \file simple_bitblaster.h
** \verbatim
** Top contributors (to current version):
** Mathias Preiner
** This file is part of the CVC4 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.\endverbatim
**
** \brief Bitblaster for simple BV solver.
**
**/
#include "cvc4_private.h"
#ifndef CVC5__THEORY__BV__BITBLAST_SIMPLE_BITBLASTER_H
#define CVC5__THEORY__BV__BITBLAST_SIMPLE_BITBLASTER_H
#include "theory/bv/bitblast/bitblaster.h"
namespace cvc5 {
namespace theory {
namespace bv {
/**
* Implementation of a simple Node-based bit-blaster.
*
* Implements the bare minimum to bit-blast bit-vector atoms/terms.
*/
class BBSimple : public TBitblaster<Node>
{
using Bits = std::vector<Node>;
public:
BBSimple(TheoryState* state);
~BBSimple() = default;
/** Bit-blast term 'node' and return bit-blasted 'bits'. */
void bbTerm(TNode node, Bits& bits) override;
/** Bit-blast atom 'node'. */
void bbAtom(TNode node) override;
/** Get bit-blasted atom, returns 'atom' itself since it's Boolean. */
Node getBBAtom(TNode atom) const override;
/** Store Boolean node representing the bit-blasted atom. */
void storeBBAtom(TNode atom, Node atom_bb) override;
/** Store bits of bit-blasted term. */
void storeBBTerm(TNode node, const Bits& bits) override;
/** Check if atom was already bit-blasted. */
bool hasBBAtom(TNode atom) const override;
/** Get bit-blasted node stored for atom. */
Node getStoredBBAtom(TNode node);
/** Create 'bits' for variable 'var'. */
void makeVariable(TNode var, Bits& bits) override;
/** Collect model values for all relevant terms given in 'relevantTerms'. */
bool collectModelValues(TheoryModel* m, const std::set<Node>& relevantTerms);
prop::SatSolver* getSatSolver() override { Unreachable(); }
/** Checks whether node is a variable introduced via `makeVariable`.*/
bool isVariable(TNode node);
private:
/** Query SAT solver for assignment of node 'a'. */
Node getModelFromSatSolver(TNode a, bool fullModel) override;
/** Caches variables for which we already created bits. */
TNodeSet d_variables;
/** Stores bit-blasted atoms. */
std::unordered_map<Node, Node, NodeHashFunction> d_bbAtoms;
/** Theory state. */
TheoryState* d_state;
};
} // namespace bv
} // namespace theory
} // namespace cvc5
#endif
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