/*
 *
 * Copyright (c) 2009-2012,
 *
 *  Galois, Inc. (Aaron Tomb <atomb@galois.com>, Rogan Creswick <creswick@galois.com>)
 *  Steve Suh    <suhsteve@gmail.com>
 *
 * 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 org.scandroid.domain.IFDSTaintDomain;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.ibm.wala.dataflow.IFDS.IFlowFunction;
import com.ibm.wala.dataflow.IFDS.IFlowFunctionMap;
import com.ibm.wala.dataflow.IFDS.IReversibleFlowFunction;
import com.ibm.wala.dataflow.IFDS.ISupergraph;
import com.ibm.wala.dataflow.IFDS.IUnaryFlowFunction;
import com.ibm.wala.dataflow.IFDS.IdentityFlowFunction;
import com.ibm.wala.ipa.callgraph.CGNode;
import com.ibm.wala.ipa.callgraph.propagation.PointerAnalysis;
import com.ibm.wala.ipa.cfg.BasicBlockInContext;
import com.ibm.wala.ssa.ISSABasicBlock;
import com.ibm.wala.util.intset.IntSet;
import com.ibm.wala.util.intset.SparseIntSet;


public class IDTransferFunctions <E extends ISSABasicBlock> implements
        IFlowFunctionMap<BasicBlockInContext<E>> {
	@SuppressWarnings("unused")
	private static final Logger logger = 
			LoggerFactory.getLogger(IDTransferFunctions.class);
	
	public static final IntSet EMPTY_SET = new SparseIntSet();
	public static final IntSet ZERO_SET = SparseIntSet.singleton(0);

    private static final IReversibleFlowFunction IDENTITY_FN = new IdentityFlowFunction();
    
    public IDTransferFunctions(IFDSTaintDomain<E> domain,
            ISupergraph<BasicBlockInContext<E>, CGNode> graph, 
            PointerAnalysis pa) {
    }

	@Override
	public IUnaryFlowFunction getNormalFlowFunction(BasicBlockInContext<E> src,
			BasicBlockInContext<E> dest) {
		return IDENTITY_FN;
	}

	@Override
	public IUnaryFlowFunction getCallFlowFunction(BasicBlockInContext<E> src,
			BasicBlockInContext<E> dest, BasicBlockInContext<E> ret) {
		return IDENTITY_FN;
	}

	@Override
	public IFlowFunction getReturnFlowFunction(BasicBlockInContext<E> call,
			BasicBlockInContext<E> src, BasicBlockInContext<E> dest) {
		return IDENTITY_FN;
	}

	@Override
	public IUnaryFlowFunction getCallToReturnFlowFunction(
			BasicBlockInContext<E> src, BasicBlockInContext<E> dest) {
		return IDENTITY_FN;
	}

	@Override
	public IUnaryFlowFunction getCallNoneToReturnFlowFunction(
			BasicBlockInContext<E> src, BasicBlockInContext<E> dest) {
		return IDENTITY_FN;
	}

}
