org.aspectj.weaver/source/org/aspectj/apache/bcel/classfile/LineNumberTable.java - ajdt/org.eclipse.ajdt - Git at Google

 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 apache@apache.org.
  *
  * 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
  * <http://www.apache.org/>.
  */

 import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;

 import org.aspectj.apache.bcel.Constants;

 /**
  * This class represents a table of line numbers for debugging purposes. This attribute is used by the <em>Code</em> attribute. It
  * contains pairs of PCs and line numbers.
  *
  * @version $Id: LineNumberTable.java,v 1.8 2009/09/15 19:40:12 aclement Exp $
  * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
  * @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; // discarded once unpacked

 	private int tableLength;
 	private LineNumber[] table;

 	/*
 	 * 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());
 	}

 	public LineNumberTable(int nameIndex, int length, LineNumber[] lineNumberTable, ConstantPool constantPool) {
 		super(Constants.ATTR_LINE_NUMBER_TABLE, nameIndex, length, constantPool);
 		setLineNumberTable(lineNumberTable);
 		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.readFully(data);
 		isInPackedState = true;
 		// assert(bytesRead==length)
 	}

 	// Unpacks the byte array into the table
 	private void unpack() {
 		if (isInPackedState) {
 			try {
 				ByteArrayInputStream bs = new ByteArrayInputStream(data);
 				DataInputStream dis = new DataInputStream(bs);
 				tableLength = (dis.readUnsignedShort());
 				table = new LineNumber[tableLength];
 				for (int i = 0; i < tableLength; i++) {
 					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
 	 */
 	@Override
 	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
 	 */
 	@Override
 	public final void dump(DataOutputStream file) throws IOException {
 		super.dump(file);
 		if (isInPackedState) {
 			file.write(data);
 		} else {
 			file.writeShort(tableLength);
 			for (int i = 0; i < tableLength; i++) {
 				table[i].dump(file);
 			}
 		}
 	}

 	/**
 	 * @return Array of (pc offset, line number) pairs.
 	 */
 	public final LineNumber[] getLineNumberTable() {
 		unpack();
 		return table;
 	}

 	/**
 	 * @param line_number_table.
 	 */
 	public final void setLineNumberTable(LineNumber[] line_number_table) {
 		this.data = null;
 		this.isInPackedState = false;
 		this.table = line_number_table;
 		this.tableLength = (line_number_table == null) ? 0 : line_number_table.length;
 	}

 	/**
 	 * @return String representation.
 	 */
 	@Override
 	public final String toString() {
 		unpack();
 		StringBuffer buf = new StringBuffer();
 		StringBuffer line = new StringBuffer();

 		for (int i = 0; i < tableLength; i++) {
 			line.append(table[i].toString());

 			if (i < tableLength - 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 = tableLength - 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 = table[i].getStartPC();

 			if (j == pos)
 				return 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 table[min_index].getLineNumber();
 	}

 	/**
 	 * @return deep copy of this attribute
 	 */
 	// @Override
 	// public Attribute copy(ConstantPool constant_pool) {
 	// unpack();
 	// LineNumberTable newTable = (LineNumberTable) clone();
 	// newTable.table = new LineNumber[tableLength];
 	// for (int i = 0; i < tableLength; i++) {
 	// newTable.table[i] = table[i].copy();
 	// }
 	// newTable.cpool = constant_pool;
 	// return newTable;
 	// }
 	public final int getTableLength() {
 		unpack();
 		return tableLength;
 	}
 }
	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 apache@apache.org.
	*
	* 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
	* <http://www.apache.org/>.
	*/

	import java.io.ByteArrayInputStream;
	import java.io.DataInputStream;
	import java.io.DataOutputStream;
	import java.io.IOException;

	import org.aspectj.apache.bcel.Constants;

	/**
	* This class represents a table of line numbers for debugging purposes. This attribute is used by the <em>Code</em> attribute. It
	* contains pairs of PCs and line numbers.
	*
	* @version $Id: LineNumberTable.java,v 1.8 2009/09/15 19:40:12 aclement Exp $
	* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
	* @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; // discarded once unpacked

	private int tableLength;
	private LineNumber[] table;

	/*
	* 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());
	}

	public LineNumberTable(int nameIndex, int length, LineNumber[] lineNumberTable, ConstantPool constantPool) {
	super(Constants.ATTR_LINE_NUMBER_TABLE, nameIndex, length, constantPool);
	setLineNumberTable(lineNumberTable);
	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.readFully(data);
	isInPackedState = true;
	// assert(bytesRead==length)
	}

	// Unpacks the byte array into the table
	private void unpack() {
	if (isInPackedState) {
	try {
	ByteArrayInputStream bs = new ByteArrayInputStream(data);
	DataInputStream dis = new DataInputStream(bs);
	tableLength = (dis.readUnsignedShort());
	table = new LineNumber[tableLength];
	for (int i = 0; i < tableLength; i++) {
	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
	*/
	@Override
	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
	*/
	@Override
	public final void dump(DataOutputStream file) throws IOException {
	super.dump(file);
	if (isInPackedState) {
	file.write(data);
	} else {
	file.writeShort(tableLength);
	for (int i = 0; i < tableLength; i++) {
	table[i].dump(file);
	}
	}
	}

	/**
	* @return Array of (pc offset, line number) pairs.
	*/
	public final LineNumber[] getLineNumberTable() {
	unpack();
	return table;
	}

	/**
	* @param line_number_table.
	*/
	public final void setLineNumberTable(LineNumber[] line_number_table) {
	this.data = null;
	this.isInPackedState = false;
	this.table = line_number_table;
	this.tableLength = (line_number_table == null) ? 0 : line_number_table.length;
	}

	/**
	* @return String representation.
	*/
	@Override
	public final String toString() {
	unpack();
	StringBuffer buf = new StringBuffer();
	StringBuffer line = new StringBuffer();

	for (int i = 0; i < tableLength; i++) {
	line.append(table[i].toString());

	if (i < tableLength - 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 = tableLength - 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 = table[i].getStartPC();

	if (j == pos)
	return 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 table[min_index].getLineNumber();
	}

	/**
	* @return deep copy of this attribute
	*/
	// @Override
	// public Attribute copy(ConstantPool constant_pool) {
	// unpack();
	// LineNumberTable newTable = (LineNumberTable) clone();
	// newTable.table = new LineNumber[tableLength];
	// for (int i = 0; i < tableLength; i++) {
	// newTable.table[i] = table[i].copy();
	// }
	// newTable.cpool = constant_pool;
	// return newTable;
	// }
	public final int getTableLength() {
	unpack();
	return tableLength;
	}
	}