/*
 * 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
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 */

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);
    }
}