/*
 * 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 static com.sun.btrace.org.objectweb.asm.Opcodes.*;
import com.sun.btrace.util.LocalVariableHelper;

/**
 * This visitor helps in inserting code whenever an
 * exception is about to be thrown. The code to insert
 * on exception throw may be decided by derived class.
 * By default, this class inserts code to print stack
 * trace of the exception thrown.
 *
 * @author A. Sundararajan
 */
public class ThrowInstrumentor extends MethodInstrumentor {
    public ThrowInstrumentor(LocalVariableHelper mv, String parentClz, String superClz,
        int access, String name, String desc) {
        super(mv, parentClz, superClz, access, name, desc);
    }

    @Override
    public void visitInsn(int opcode) {
        if (opcode == ATHROW) {
            onThrow();
        }
        super.visitInsn(opcode);
    }

    protected void onThrow() {
        visitInsn(DUP);
        visitMethodInsn(INVOKEVIRTUAL,
                    "java/lang/Throwable",
                    "printStackTrace",
                    "()V",
                    false);
    }
}