examples/api/extract.cpp

   1 /*********************                                                        */
   2 /*! \file extract.cpp
   3  ** \verbatim
   4  ** Top contributors (to current version):
   5  **   Clark Barrett
   6  ** This file is part of the CVC4 project.
   7  ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
   8  ** in the top-level source directory) and their institutional affiliations.
   9  ** All rights reserved.  See the file COPYING in the top-level source
  10  ** directory for licensing information.\endverbatim
  11  **
  12  ** \brief A simple demonstration of the solving capabilities of the CVC4
  13  ** bit-vector solver.
  14  **
  15  **/
  16
  17 #include <iostream>
  18
  19 #include <cvc4/cvc4.h>
  20
  21 using namespace std;
  22 using namespace CVC4;
  23
  24 int main() {
  25   ExprManager em;
  26   SmtEngine smt(&em);
  27   smt.setLogic("QF_BV"); // Set the logic
  28
  29   Type bitvector32 = em.mkBitVectorType(32);
  30
  31   Expr x = em.mkVar("a", bitvector32);
  32
  33   Expr ext_31_1 = em.mkConst(CVC4::BitVectorExtract(31,1));
  34   Expr x_31_1 = em.mkExpr(ext_31_1, x);
  35
  36   Expr ext_30_0 = em.mkConst(CVC4::BitVectorExtract(30,0));
  37   Expr x_30_0 = em.mkExpr(ext_30_0, x);
  38
  39   Expr ext_31_31 = em.mkConst(CVC4::BitVectorExtract(31,31));
  40   Expr x_31_31 = em.mkExpr(ext_31_31, x);
  41
  42   Expr ext_0_0 = em.mkConst(CVC4::BitVectorExtract(0,0));
  43   Expr x_0_0 = em.mkExpr(ext_0_0, x);
  44
  45   Expr eq = em.mkExpr(kind::EQUAL, x_31_1, x_30_0);
  46   cout << " Asserting: " << eq << endl;
  47   smt.assertFormula(eq);
  48
  49   Expr eq2 = em.mkExpr(kind::EQUAL, x_31_31, x_0_0);
  50   cout << " Querying: " << eq2 << endl;
  51   cout << " Expect entailed. " << endl;
  52   cout << " CVC4: " << smt.checkEntailed(eq2) << endl;
  53
  54   return 0;
  55 }