/*
* JBoss, Home of Professional Open Source
* Copyright 2008-10 Red Hat and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*
* @authors Andrew Dinn
*/
package org.jboss.byteman.agent.adapter;
import org.objectweb.asm.*;
import org.jboss.byteman.agent.TransformContext;
/**
* asm Adapter class used to check that the target method for a rule exists in a class
*/
public class ThrowCheckAdapter extends RuleCheckAdapter
{
public ThrowCheckAdapter(ClassVisitor cv, TransformContext transformContext, String exceptionClass, int count)
{
super(cv, transformContext);
this.exceptionClass = exceptionClass;
this.count = count;
this.visitedCount = 0;
}
public MethodVisitor visitMethod(
final int access,
final String name,
final String desc,
final String signature,
final String[] exceptions)
{
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
if (matchTargetMethod(access, name, desc)) {
setVisited();
return new ThrowCheckMethodAdapter(mv, getTransformContext(), access, name, desc, signature, exceptions);
}
return mv;
}
/**
* a method visitor used to add a rule event trigger call to a method
*/
private class ThrowCheckMethodAdapter extends RuleCheckMethodAdapter
{
private int access;
private String name;
private String descriptor;
private String signature;
private String[] exceptions;
private boolean visited;
ThrowCheckMethodAdapter(MethodVisitor mv, TransformContext transformContext, int access, String name, String descriptor, String signature, String[] exceptions)
{
super(mv, transformContext, access, name, descriptor);
this.access = access;
this.name = name;
this.descriptor = descriptor;
this.signature = signature;
this.exceptions = exceptions;
visitedCount = 0;
}
public void visitInsn(final int opcode) {
if (opcode == Opcodes.ATHROW) {
// ok, we have hit a throw -- for now we just count any throw
// later we will try to match the exception class
if (count == 0 || visitedCount < count) {
visitedCount++;
if (count == 0 || visitedCount == count) {
// and we have enough occurences to match the count
setTriggerPoint();
}
}
}
super.visitInsn(opcode);
}
}
private String exceptionClass;
private int count;
private int visitedCount;
}