/*
* FindBugs - Find bugs in Java programs
* Copyright (C) 2004-2006 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 edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.OpcodeStack;
import edu.umd.cs.findbugs.OpcodeStack.Item;
import edu.umd.cs.findbugs.ba.AnalysisContext;
import edu.umd.cs.findbugs.ba.ClassContext;
import edu.umd.cs.findbugs.ba.interproc.ParameterProperty;
import edu.umd.cs.findbugs.bcel.OpcodeStackDetector;
import edu.umd.cs.findbugs.visitclass.PreorderVisitor;
public class IntCast2LongAsInstant extends OpcodeStackDetector {
final BugReporter bugReporter;
int lastConstantForSIPUSH;
TrainLongInstantfParams.LongInstantParameterDatabase database = new TrainLongInstantfParams.LongInstantParameterDatabase();
public IntCast2LongAsInstant(BugReporter bugReporter) {
this.bugReporter = bugReporter;
AnalysisContext.currentAnalysisContext().loadPropertyDatabaseFromResource(database, "longInstant.db",
"long instant database");
}
@Override
public void sawOpcode(int seen) {
if (seen == SIPUSH) {
lastConstantForSIPUSH = getIntConstant();
}
if (seen == INVOKEINTERFACE || seen == INVOKEVIRTUAL || seen == INVOKESPECIAL || seen == INVOKESTATIC) {
String signature = getSigConstantOperand();
int numberArguments = PreorderVisitor.getNumberArguments(signature);
for (int i = 0; i < numberArguments; i++) {
Item item = stack.getStackItem(numberArguments - 1 - i);
if (item.getSpecialKind() == OpcodeStack.Item.RESULT_OF_I2L) {
ParameterProperty property = database.getProperty(getMethodDescriptorOperand());
if (property != null && property.hasProperty(i)) {
int priority = NORMAL_PRIORITY;
if (getPrevOpcode(1) == I2L && getPrevOpcode(2) == IMUL && getPrevOpcode(3) == SIPUSH
&& lastConstantForSIPUSH == 1000) {
priority = HIGH_PRIORITY;
} else if (getPrevOpcode(1) == I2L && getPrevOpcode(2) == IMUL && getPrevOpcode(4) == SIPUSH
&& lastConstantForSIPUSH == 1000) {
priority = HIGH_PRIORITY;
}
BugInstance bug = new BugInstance(this, "ICAST_INT_2_LONG_AS_INSTANT", priority).addClassAndMethod(this)
.addCalledMethod(this).addValueSource(item, this).addSourceLine(this);
bugReporter.reportBug(bug);
}
}
}
}
}
/*
* (non-Javadoc)
*
* @see edu.umd.cs.findbugs.Detector#report()
*/
@Override
public void report() {
}
@Override
public void visitClassContext(ClassContext classContext) {
classContext.getJavaClass().accept(this);
}
}