/* * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the Classpath exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.btrace.runtime.instr; import java.util.Map; import java.util.HashMap; import com.sun.btrace.org.objectweb.asm.Label; import com.sun.btrace.util.LocalVariableHelper; /** * This visitor helps in inserting code whenever an exception * is caught or finally block is reached. The code to insert on * exception catch or finally may be decided by derived class. * By default, this class inserts code to print a message. * * @author A. Sundararajan */ public class CatchInstrumentor extends MethodInstrumentor { private Map<Label, String> handlers = new HashMap<Label, String>(); public CatchInstrumentor(LocalVariableHelper mv, String parentClz, String superClz, int access, String name, String desc) { super(mv, parentClz, superClz, access, name, desc); } @Override public void visitLabel(Label label) { super.visitLabel(label); String catchType = handlers.get(label); if (catchType != null) { onCatch(catchType); } } @Override public void visitTryCatchBlock(Label start, Label end, Label handler, String type) { if (type != null) { handlers.put(handler, type); } super.visitTryCatchBlock(start, end, handler, type); } protected void onCatch(String type) { asm.println("catching " + type); } }