/*
* FindBugs - Find bugs in Java programs
* Copyright (C) 2004-2008 University of Maryland
* Copyright (C) 2008 Google
*
* 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 java.util.Iterator;
import java.util.Set;
import org.apache.bcel.Constants;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.INVOKESTATIC;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.InstructionHandle;
import org.apache.bcel.generic.InvokeInstruction;
import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.Detector;
import edu.umd.cs.findbugs.Priorities;
import edu.umd.cs.findbugs.ba.AnalysisContext;
import edu.umd.cs.findbugs.ba.CFG;
import edu.umd.cs.findbugs.ba.CFGBuilderException;
import edu.umd.cs.findbugs.ba.ClassContext;
import edu.umd.cs.findbugs.ba.DataflowAnalysisException;
import edu.umd.cs.findbugs.ba.Hierarchy2;
import edu.umd.cs.findbugs.ba.Location;
import edu.umd.cs.findbugs.ba.MethodUnprofitableException;
import edu.umd.cs.findbugs.ba.XClass;
import edu.umd.cs.findbugs.ba.XMethod;
import edu.umd.cs.findbugs.ba.type.TypeDataflow;
import edu.umd.cs.findbugs.ba.type.TypeFrame;
import edu.umd.cs.findbugs.bcel.BCELUtil;
public class CallToUnsupportedMethod implements Detector {
BugReporter bugReporter;
public CallToUnsupportedMethod(BugReporter bugReporter) {
this.bugReporter = bugReporter;
}
@Override
public void visitClassContext(ClassContext classContext) {
JavaClass javaClass = classContext.getJavaClass();
Method[] methodList = javaClass.getMethods();
for (Method method : methodList) {
if (method.getCode() == null) {
continue;
}
try {
analyzeMethod(classContext, method);
} catch (MethodUnprofitableException e) {
assert true; // move along; nothing to see
} catch (CFGBuilderException e) {
String msg = "Detector " + this.getClass().getName() + " caught exception while analyzing "
+ javaClass.getClassName() + "." + method.getName() + " : " + method.getSignature();
bugReporter.logError(msg, e);
} catch (DataflowAnalysisException e) {
String msg = "Detector " + this.getClass().getName() + " caught exception while analyzing "
+ javaClass.getClassName() + "." + method.getName() + " : " + method.getSignature();
bugReporter.logError(msg, e);
}
}
}
/**
* @param classContext
* @param method
*/
private void analyzeMethod(ClassContext classContext, Method method) throws MethodUnprofitableException, CFGBuilderException,
DataflowAnalysisException {
if (BCELUtil.isSynthetic(method)|| (method.getAccessFlags() & Constants.ACC_BRIDGE) == Constants.ACC_BRIDGE) {
return;
}
CFG cfg = classContext.getCFG(method);
TypeDataflow typeDataflow = classContext.getTypeDataflow(method);
ConstantPoolGen constantPoolGen = classContext.getConstantPoolGen();
locationLoop: for (Iterator<Location> iter = cfg.locationIterator(); iter.hasNext();) {
Location location = iter.next();
InstructionHandle handle = location.getHandle();
Instruction ins = handle.getInstruction();
// Only consider invoke instructions
if (!(ins instanceof InvokeInstruction)) {
continue;
}
if (ins instanceof INVOKEINTERFACE) {
continue;
}
InvokeInstruction inv = (InvokeInstruction) ins;
TypeFrame frame = typeDataflow.getFactAtLocation(location);
String methodName = inv.getMethodName(constantPoolGen);
if (methodName.toLowerCase().indexOf("unsupported") >= 0) {
continue;
}
String methodSig = inv.getSignature(constantPoolGen);
if (methodSig.equals("()Ljava/lang/UnsupportedOperationException;")) {
continue;
}
Set<XMethod> targets;
try {
targets = Hierarchy2.resolveMethodCallTargets(inv, frame, constantPoolGen);
} catch (ClassNotFoundException e) {
AnalysisContext.reportMissingClass(e);
continue locationLoop;
}
if (targets.isEmpty()) {
continue locationLoop;
}
int priority = targets.size() == 1 ? Priorities.HIGH_PRIORITY : Priorities.NORMAL_PRIORITY;
for (XMethod m : targets) {
if (!m.isUnsupported()) {
continue locationLoop;
}
XClass xc = AnalysisContext.currentXFactory().getXClass(m.getClassDescriptor());
if (!(inv instanceof INVOKESTATIC) && !(m.isFinal() || xc.isFinal())) {
priority = Priorities.NORMAL_PRIORITY;
}
if (xc == null || xc.isAbstract()) {
try {
if (!AnalysisContext.currentAnalysisContext().getSubtypes2().hasSubtypes(m.getClassDescriptor())) {
continue locationLoop;
}
} catch (ClassNotFoundException e) {
AnalysisContext.reportMissingClass(e);
continue locationLoop;
}
}
}
BugInstance bug = new BugInstance(this, "DMI_UNSUPPORTED_METHOD", priority)
.addClassAndMethod(classContext.getJavaClass(), method).addCalledMethod(constantPoolGen, inv)
.addSourceLine(classContext, method, location);
bugReporter.reportBug(bug);
}
}
/*
* (non-Javadoc)
*
* @see edu.umd.cs.findbugs.Detector#report()
*/
@Override
public void report() {
// TODO Auto-generated method stub
}
}