/*
* 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.
*
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*/
package com.sun.btrace.runtime.instr;
import com.sun.btrace.org.objectweb.asm.*;
import com.sun.btrace.util.LocalVariableHelper;
/**
* This visitor helps in inserting code whenever a source
* line is reached. The code to insert on line number may
* be decided by derived class. By default, this class
* inserts code to print the line.
*
* @author A. Sundararajan
*/
public class LineNumberInstrumentor extends MethodInstrumentor {
private int lastLine;
public LineNumberInstrumentor(LocalVariableHelper mv, String parentClz, String superClz,
int access, String name, String desc) {
super(mv, parentClz, superClz, access, name, desc);
}
@Override
public void visitLineNumber(int line, Label start) {
if (lastLine != 0) {
onAfterLine(line - 1);
}
onBeforeLine(line);
lastLine = line;
super.visitLineNumber(line, start);
}
protected void onBeforeLine(int line) {
asm.println("before line " + line);
}
protected void onAfterLine(int line) {
asm.println("after line " + line);
}
}