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/*
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html.
 *
 * This file is a derivative of code released under the terms listed below.
 *
 */
/*
 * Copyright (c) 2009-2012,
 *
 * Galois, Inc. (Aaron Tomb , Rogan Creswick , Adam
 * Foltzer ) Steve Suh 
 *
 * 
All rights reserved.
 *
 * 
Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 
1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 
2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 
3. The names of the contributors may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.scandroid.flow.functions;

import com.ibm.wala.dataflow.IFDS.IUnaryFlowFunction;
import com.ibm.wala.ssa.ISSABasicBlock;
import com.ibm.wala.util.intset.IntSet;
import com.ibm.wala.util.intset.SparseIntSet;
import org.scandroid.domain.DomainElement;
import org.scandroid.domain.IFDSTaintDomain;
import org.scandroid.domain.LocalElement;

/**
 * Flow function that only permits globals - and the zero element - to flow through
 *
 * @author creswick
 */
public class GlobalIdentityFunction implements IUnaryFlowFunction {

  private final IFDSTaintDomain domain;

  public GlobalIdentityFunction(IFDSTaintDomain domain) {
    this.domain = domain;
  }

  /* (non-Javadoc)
   * @see com.ibm.wala.dataflow.IFDS.IUnaryFlowFunction#getTargets(int)
   */
  @Override
  public IntSet getTargets(int d1) {
    if (0 == d1) {
      return TaintTransferFunctions.ZERO_SET;
    }

    DomainElement de = domain.getMappedObject(d1);
    if (de.codeElement instanceof LocalElement) {
      // if the query domain element is a local, then it is /not/ passed through.

      return TaintTransferFunctions.EMPTY_SET;
    } else {
      return SparseIntSet.singleton(d1);
    }
  }
}