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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 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();
- StringBuilder buf = new StringBuilder();
- StringBuilder line = new StringBuilder();
-
- 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;
- }
- }
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