gt:     int result = natSetBitCount();
context: /* gnu.java.math.GMP -- Arbitary precision integers using GMP
     Copyright (C) 2006 Free Software Foundation, Inc.
  
  This file is part of GNU Classpath.
  
  GNU Classpath is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2, or (at your option)
  any later version.
   
  GNU Classpath is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with GNU Classpath; see the file COPYING.  If not, write to the
  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301 USA.
  
  Linking this library statically or dynamically with other modules is
  making a combined work based on this library.  Thus, the terms and
  conditions of the GNU General Public License cover the whole
  combination.
  
  As a special exception, the copyright holders of this library give you
  permission to link this library with independent modules to produce an
  executable, regardless of the license terms of these independent
  modules, and to copy and distribute the resulting executable under
  terms of your choice, provided that you also meet, for each linked
  independent module, the terms and conditions of the license of that
  module.  An independent module is a module which is not derived from
  or based on this library.  If you modify this library, you may extend
  this exception to your version of the library, but you are not
  obligated to do so.  If you do not wish to do so, delete this
  exception statement from your version. */
  
  
  package gnu.java.math;
  
  import gnu.classpath.Pointer;
  
  /**
   * Implement BigInteger using GMP
   */
  public final class GMP
  {
    private Pointer native_ptr;
    private int refCount = 1;
    
    public GMP()
    {
      super();
      
      natInitialize();
    }
  
    private synchronized void acquireRef()
    {
      refCount++;
    }
    
    private synchronized void releaseRef()
    {
      refCount--;
      if (refCount == 0)
        {
  	natFinalize();
  	native_ptr = null;
        }
    }
    
    protected void finalize()
    {
      releaseRef();
    }
    
    
    public void fromByteArray(byte[] v)
    {
      acquireRef();
      natFromByteArray(v);
      releaseRef();
    }
    
    public void fromBI(GMP x)
    {
      acquireRef();
      x.acquireRef();
      natFromBI(x.native_ptr);
      x.releaseRef();
      releaseRef();
    }
    
    public void fromLong(long n)
    {
      acquireRef();
      natFromLong(n);
      releaseRef();
    }
    
    public int fromString(String s, int rdx)
    {
      acquireRef();
      int result = natFromString(s, rdx);
      releaseRef();
      return result;
    }
    
    public void fromSignedMagnitude(byte[] m, boolean isNegative)
    {
      acquireRef();
      natFromSignedMagnitude(m, isNegative);
      releaseRef();
    }
    
    public String toString(int b)
    {
      acquireRef();
      String result = natToString(b);
      releaseRef();
      return result;
    }
    
    public void toByteArray(byte[] r)
    {
      acquireRef();
      natToByteArray(r);
      releaseRef();
    }
    
    public double doubleValue()
    {
      acquireRef();
      double result = natDoubleValue();
      releaseRef();
      return result;
    }
    
    public int absIntValue()
    {
      acquireRef();
      int result = natAbsIntValue();
      releaseRef();
      return result;
    }
    
    public int compare(GMP x)
    {
      acquireRef();
      x.acquireRef();
      int result = natCompare(x.native_ptr);
      x.releaseRef();
      releaseRef();
      return result;
    }
    
    public void add(GMP x, GMP r)
    {
      acquireRef();
      x.acquireRef();
      r.acquireRef();
      natAdd(x.native_ptr, r.native_ptr);
      r.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void subtract(GMP x, GMP r)
    {
      acquireRef();
      x.acquireRef();
      r.acquireRef();
      natSubtract(x.native_ptr, r.native_ptr);
      r.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void multiply(GMP x, GMP r)
    {
      acquireRef();
      x.acquireRef();
      r.acquireRef();
      natMultiply(x.native_ptr, r.native_ptr);
      r.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void quotient(GMP x, GMP r)
    {
      acquireRef();
      x.acquireRef();
      r.acquireRef();
      natQuotient(x.native_ptr, r.native_ptr);
      r.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void remainder(GMP x, GMP r)
    {
      acquireRef();
      x.acquireRef();
      r.acquireRef();
      natRemainder(x.native_ptr, r.native_ptr);
      r.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void quotientAndRemainder(GMP x, GMP q, GMP r)
    {
      acquireRef();
      x.acquireRef();
      q.acquireRef();
      r.acquireRef();
      natQuotientAndRemainder(x.native_ptr, q.native_ptr, r.native_ptr);
      r.releaseRef();
      q.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void modulo(GMP x, GMP r)
    {
      acquireRef();
      x.acquireRef();
      r.acquireRef();
      natModulo(x.native_ptr, r.native_ptr);
      r.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void pow(int n, GMP r)
    {
      acquireRef();
      r.acquireRef();
      natPow(n, r.native_ptr);
      r.releaseRef();
      releaseRef();
    }
    
    public void modPow(GMP e, GMP m, GMP r)
    {
      acquireRef();
      e.acquireRef();
      m.acquireRef();
      r.acquireRef();
      natModPow(e.native_ptr, m.native_ptr, r.native_ptr);
      r.releaseRef();
      m.releaseRef();
      e.releaseRef();
      releaseRef();
    }
    
    public void modInverse(GMP m, GMP r)
    {
      acquireRef();
      m.acquireRef();
      r.acquireRef();
      natModInverse(m.native_ptr, r.native_ptr);
      r.releaseRef();
      m.releaseRef();
      releaseRef();
    }
  
    public void gcd(GMP x, GMP r)
    {
      acquireRef();
      x.acquireRef();
      r.acquireRef();
      natGCD(x.native_ptr, r.native_ptr);
      r.releaseRef();
      x.releaseRef();
      releaseRef();
    }
    
    public void shiftLeft(int n, GMP r)
    {
      acquireRef();
      r.acquireRef();
      natShiftLeft(n, r.native_ptr);
      r.releaseRef();
      releaseRef();
    }
    
    public void shiftRight(int n, GMP r)
    {
      acquireRef();
      r.acquireRef();
      natShiftRight(n, r.native_ptr);
      r.releaseRef();
      releaseRef();
    }
    
    public void abs(GMP r)
    {
      acquireRef();
      r.acquireRef();
      natAbs(r.native_ptr);
      r.releaseRef();
      releaseRef();
    }
    
    public void negate(GMP r)
    {
      acquireRef();
      r.acquireRef();
      natNegate(r.native_ptr);
      r.releaseRef();
      releaseRef();
    }
    
    public int bitLength()
    {
      acquireRef();
      int result = natBitLength();
      releaseRef();
      return result;
    }
    
    public int bitCount()
    {
      acquireRef();
  