bw-reducing-solver/ExprSimplifier.h at master · martinjonas/bw-reducing-solver · GitHub

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#ifndef EXPRSIMPLIFIER_H
#define EXPRSIMPLIFIER_H
#include "z3++.h"
#include <map>
#include <vector>
#include <set>

enum Polarity { POSITIVE, NEGATIVE, BOTH_POLARITIES };

class ExprSimplifier
{
public:
    ExprSimplifier(z3::context &ctx) : propagateUnconstrained(false), goalUnconstrained(false)
    {
      this->context = &ctx;
    }

    ExprSimplifier(z3::context &ctx, bool propagateUnconstrained) : propagateUnconstrained(propagateUnconstrained), goalUnconstrained(false)
    {
      this->context = &ctx;
    }

    ExprSimplifier(z3::context &ctx, bool propagateUnconstrained, bool goalUnconstrained) : propagateUnconstrained(propagateUnconstrained), goalUnconstrained(goalUnconstrained)
    {
      this->context = &ctx;
    }

    z3::expr Simplify (z3::expr);
    z3::expr ApplyConstantEqualities(const z3::expr&);
    z3::expr PushQuantifierIrrelevantSubformulas(const z3::expr&);
    z3::expr RefinedPushQuantifierIrrelevantSubformulas(const z3::expr&);
    z3::expr negate(const z3::expr&);
    bool isSentence(const z3::expr&);
    z3::expr PushNegations(const z3::expr&);
    z3::expr CanonizeBoundVariables(const z3::expr&);
    z3::expr DeCanonizeBoundVariables(const z3::expr&);
    z3::expr StripToplevelExistentials(z3::expr, bool isPositive);
    z3::expr RemoveExistentials(z3::expr);
    z3::expr SubstituteExistentials(z3::expr, std::map<std::string, z3::expr>& model, std::vector<std::string>& boundVars);
    z3::expr ReduceDivRem(const z3::expr&);

private:
    enum BoundType { EXISTENTIAL, UNIVERSAL };

    struct Var
    {
	std::string name;
	BoundType boundType;
	z3::expr expr;

    Var(std::string name, BoundType boundType, z3::expr e) :
	name(name), boundType(boundType), expr(e)
	    {  }
    };

    std::map<const Z3_ast, z3::expr> refinedPushIrrelevantCache;
    std::map<const Z3_ast, z3::expr> pushIrrelevantCache;
    std::map<std::tuple<const Z3_ast, int, int>, z3::expr> decreaseDeBruijnCache;
    std::map<std::tuple<const Z3_ast, int, int>, bool> isRelevantCache;
    std::map<const Z3_ast, z3::expr> pushNegationsCache;
    std::map<std::string, std::string> canonizeVariableRenaming;
    std::map<const Z3_ast, bool> isSentenceCache;
    std::map<const Z3_ast, z3::expr> reduceDivRemCache;
    void clearCaches();

    z3::context* context;
    bool getSubstitutableEquality(const z3::expr&, z3::expr*, z3::expr*);
    z3::expr decreaseDeBruijnIndices(const z3::expr&, int, int);
    bool isRelevant(const z3::expr&, int, int);
    z3::expr mk_or(const z3::expr_vector&) const;
    z3::expr mk_and(const z3::expr_vector&) const ;
    z3::expr modifyQuantifierBody(const z3::expr& quantifierExpr, const z3::expr& newBody) const;
    z3::expr flipQuantifierAndModifyBody(const z3::expr& quantifierExpr, const z3::expr& newBody) const;
    z3::expr applyDer(const z3::expr&) const;

    std::set< std::tuple< const Z3_ast, bool > > processedPolaritiesCache;
    std::map< std::string, Polarity > variablePolarities;
    void getVariablePolarities(const z3::expr&, bool);

    z3::expr EliminatePureLiterals(z3::expr&);

    bool isVar(const z3::expr&) const;
    bool propagateUnconstrained;
    bool goalUnconstrained;

    int lastBound = 0;
};


#endif // EXPRSIMPLIFIER_H