/*
 * Bytecode Analysis Framework
 * Copyright (C) 2003,2004 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.ba.vna;

import java.util.HashMap;
import java.util.Map;

import javax.annotation.CheckForNull;

import org.apache.bcel.classfile.Method;

import edu.umd.cs.findbugs.ba.AbstractDataflow;
import edu.umd.cs.findbugs.ba.CFG;
import edu.umd.cs.findbugs.ba.SignatureParser;
import edu.umd.cs.findbugs.internalAnnotations.DottedClassName;

public class ValueNumberDataflow extends AbstractDataflow<ValueNumberFrame, ValueNumberAnalysis> {
    public ValueNumberDataflow(CFG cfg, ValueNumberAnalysis analysis) {
        super(cfg, analysis);
    }

    /**
     * Build map of value numbers to param indices. The first parameter has
     * index 0, the second has index 1, etc.
     *
     * @param method
     *            the method analyzed by the ValueNumberAnalysis
     * @return the value number to parameter index map
     */
    public Map<ValueNumber, Integer> getValueNumberToParamMap(Method method) {
        return getValueNumberToParamMap(method.getSignature(), method.isStatic());
    }

    /**
     * Build map of value numbers to param indices. The first parameter has
     * index 0, the second has index 1, etc.
     *
     * @param methodSignature
     *            signature of the method analyzed by the ValueNumberAnalysis
     * @param isStatic
     *            true if the method is static, false if not
     * @return the value number to parameter index map
     */
    public Map<ValueNumber, Integer> getValueNumberToParamMap(String methodSignature, boolean isStatic) {
        HashMap<ValueNumber, Integer> valueNumberToParamMap = new HashMap<ValueNumber, Integer>();

        ValueNumberFrame frameAtEntry = getStartFact(getCFG().getEntry());

        int numParams = new SignatureParser(methodSignature).getNumParameters();
        int shift = isStatic ? 0 : 1;
        for (int i = 0; i < numParams; ++i) {
            valueNumberToParamMap.put(frameAtEntry.getValue(i + shift), i);
        }

        return valueNumberToParamMap;
    }

    public @CheckForNull
    @DottedClassName
    String getClassName(ValueNumber v) {
        return getAnalysis().getClassName(v);

    }
}

