anylockcountanalysis.java

一个查找java程序里bug的程序的源代码,该程序本身也是java写的,对提高java编程水平很有用

/*
 * 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;

import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.MONITORENTER;
import org.apache.bcel.generic.MONITOREXIT;
import org.apache.bcel.generic.MethodGen;

public class AnyLockCountAnalysis extends LockCountAnalysis {

	public AnyLockCountAnalysis(MethodGen methodGen, ValueNumberDataflow vnaDataflow, DepthFirstSearch dfs) {
		super(methodGen, vnaDataflow, dfs);
	}

	public void initEntryFact(LockCount result) {
		if (methodGen.isSynchronized())
			result.setCount(1);
		else
			result.setCount(0);
	}

	public int getDelta(Instruction ins, ValueNumberFrame frame) throws DataflowAnalysisException {
		int delta = 0;
		if (ins instanceof MONITORENTER)
			++delta;
		else if (ins instanceof MONITOREXIT)
			--delta;
		return delta;
	}
}

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