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package org.aspectj.apache.bcel.classfile;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
import org.aspectj.apache.bcel.Constants;
import java.io.*;
/**
* This class represents a table of line numbers for debugging
* purposes. This attribute is used by the Code attribute. It
* contains pairs of PCs and line numbers.
*
* @version $Id: LineNumberTable.java,v 1.5 2008/08/26 15:00:39 aclement Exp $
* @author M. Dahm
* @see Code
*
* changes:
* asc Feb06 Made unpacking lazy
*/
public final class LineNumberTable extends Attribute {
// if 'isInPackedState' then this data needs unpacking
private boolean isInPackedState = false;
private byte[] data;
private int line_number_table_length;
private LineNumber[] line_number_table; // Table of line/numbers pairs
/*
* Initialize from another object. Note that both objects use the same
* references (shallow copy). Use copy() for a physical copy.
*/
public LineNumberTable(LineNumberTable c) {
this(c.getNameIndex(), c.getLength(), c.getLineNumberTable(), c.getConstantPool());
}
/*
* @param name_index Index of name
* @param length Content length in bytes
* @param line_number_table Table of line/numbers pairs
* @param constant_pool Array of constants
*/
public LineNumberTable(int name_index, int length,
LineNumber[] line_number_table, ConstantPool constant_pool) {
super(Constants.ATTR_LINE_NUMBER_TABLE, name_index, length, constant_pool);
setLineNumberTable(line_number_table);
isInPackedState=false;
}
/**
* Construct object from file stream.
* @param name_index Index of name
* @param length Content length in bytes
* @param file Input stream
* @throws IOException
* @param constant_pool Array of constants
*/
LineNumberTable(int name_index, int length, DataInputStream file,
ConstantPool constant_pool) throws IOException
{
this(name_index, length, (LineNumber[])null, constant_pool);
data = new byte[length];
file.read(data);
isInPackedState = true;
// assert(bytesRead==length)
}
// Unpacks the byte array into the table
private void unpack() {
if (!isInPackedState) return;
try {
ByteArrayInputStream bs = new ByteArrayInputStream(data);
DataInputStream dis = new DataInputStream(bs);
line_number_table_length = (dis.readUnsignedShort());
line_number_table = new LineNumber[line_number_table_length];
for (int i=0; i < line_number_table_length; i++)
line_number_table[i] = new LineNumber(dis);
dis.close();
data = null; // throw it away now
} catch (IOException e) {
throw new RuntimeException("Unpacking of LineNumberTable attribute failed");
}
isInPackedState=false;
}
/**
* Called by objects that are traversing the nodes of the tree implicitely
* defined by the contents of a Java class. I.e., the hierarchy of methods,
* fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
public void accept(ClassVisitor v) {
unpack();
v.visitLineNumberTable(this);
}
/**
* Dump line number table attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
public final void dump(DataOutputStream file) throws IOException
{
super.dump(file);
if (isInPackedState) {
file.write(data);
} else {
file.writeShort(line_number_table_length);
for(int i=0; i < line_number_table_length; i++)
line_number_table[i].dump(file);
}
}
/**
* @return Array of (pc offset, line number) pairs.
*/
public final LineNumber[] getLineNumberTable() { unpack();return line_number_table; }
/**
* @param line_number_table.
*/
public final void setLineNumberTable(LineNumber[] line_number_table) {
this.data = null;
this.isInPackedState=false;
this.line_number_table = line_number_table;
line_number_table_length = (line_number_table == null)? 0 :
line_number_table.length;
}
/**
* @return String representation.
*/
public final String toString() {
unpack();
StringBuffer buf = new StringBuffer();
StringBuffer line = new StringBuffer();
for(int i=0; i < line_number_table_length; i++) {
line.append(line_number_table[i].toString());
if(i < line_number_table_length - 1)
line.append(", ");
if(line.length() > 72) {
line.append('\n');
buf.append(line);
line.setLength(0);
}
}
buf.append(line);
return buf.toString();
}
/**
* Map byte code positions to source code lines.
*
* @param pos byte code offset
* @return corresponding line in source code
*/
public int getSourceLine(int pos) {
unpack();
int l = 0, r = line_number_table_length-1;
if(r < 0) // array is empty
return -1;
int min_index = -1, min=-1;
/* Do a binary search since the array is ordered.
*/
do {
int i = (l + r) / 2;
int j = line_number_table[i].getStartPC();
if(j == pos)
return line_number_table[i].getLineNumber();
else if(pos < j) // else constrain search area
r = i - 1;
else // pos > j
l = i + 1;
/* If exact match can't be found (which is the most common case)
* return the line number that corresponds to the greatest index less
* than pos.
*/
if(j < pos && j > min) {
min = j;
min_index = i;
}
} while(l <= r);
/* It's possible that we did not find any valid entry for the bytecode
* offset we were looking for.
*/
if (min_index < 0)
return -1;
return line_number_table[min_index].getLineNumber();
}
/**
* @return deep copy of this attribute
*/
public Attribute copy(ConstantPool constant_pool) {
unpack();
LineNumberTable c = (LineNumberTable)clone();
c.line_number_table = new LineNumber[line_number_table_length];
for(int i=0; i < line_number_table_length; i++)
c.line_number_table[i] = line_number_table[i].copy();
c.constantPool = constant_pool;
return c;
}
public final int getTableLength() { unpack();return line_number_table_length; }
}
