/*
* FindBugs - Find bugs in Java programs
* Copyright (C) 2003-2005 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.detect;
import org.apache.bcel.classfile.Code;
import edu.umd.cs.findbugs.BugAccumulator;
import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.BytecodeScanningDetector;
import edu.umd.cs.findbugs.StatelessDetector;
import edu.umd.cs.findbugs.ba.Hierarchy;
public class FindRunInvocations extends BytecodeScanningDetector implements StatelessDetector {
private final BugReporter bugReporter;
private final BugAccumulator bugAccumulator;
private boolean alreadySawStart;
public FindRunInvocations(BugReporter bugReporter) {
this.bugReporter = bugReporter;
this.bugAccumulator = new BugAccumulator(bugReporter);
}
private boolean isThread(String clazz) {
try {
return Hierarchy.isSubtype(clazz, "java.lang.Thread");
} catch (ClassNotFoundException e) {
bugReporter.reportMissingClass(e);
return false;
}
}
@Override
public void visit(Code obj) {
alreadySawStart = false;
super.visit(obj);
bugAccumulator.reportAccumulatedBugs();
}
@Override
public void sawOpcode(int seen) {
if (alreadySawStart)
return;
if ((seen == INVOKEVIRTUAL || seen == INVOKEINTERFACE) && getSigConstantOperand().equals("()V")
&& isThread(getDottedClassConstantOperand())) {
if (getNameConstantOperand().equals("start"))
alreadySawStart = true;
else {
boolean isJustThread = !getDottedClassConstantOperand().equals("java.lang.Thread");
if (amVisitingMainMethod() && getPC() == getCode().getLength() - 4 && isJustThread)
return;
else if (getNameConstantOperand().equals("run"))
bugAccumulator.accumulateBug(new BugInstance(this, "RU_INVOKE_RUN", isJustThread ? HIGH_PRIORITY
: NORMAL_PRIORITY).addClassAndMethod(this), this);
}
}
}
}