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244 lines
8.0 KiB
244 lines
8.0 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.classfile;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import java.io.*;
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/**
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* This class represents a table of line numbers for debugging
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* purposes. This attribute is used by the <em>Code</em> attribute. It
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* contains pairs of PCs and line numbers.
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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* @see Code
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* @see LineNumber
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*/
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public final class LineNumberTable extends Attribute {
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private int line_number_table_length;
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private LineNumber[] line_number_table; // Table of line/numbers pairs
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/*
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* Initialize from another object. Note that both objects use the same
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* references (shallow copy). Use copy() for a physical copy.
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*/
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public LineNumberTable(LineNumberTable c) {
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this(c.getNameIndex(), c.getLength(), c.getLineNumberTable(),
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c.getConstantPool());
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}
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/*
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* @param name_index Index of name
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* @param length Content length in bytes
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* @param line_number_table Table of line/numbers pairs
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* @param constant_pool Array of constants
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*/
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public LineNumberTable(int name_index, int length,
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LineNumber[] line_number_table,
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ConstantPool constant_pool)
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{
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super(Constants.ATTR_LINE_NUMBER_TABLE, name_index, length, constant_pool);
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setLineNumberTable(line_number_table);
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}
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/**
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* Construct object from file stream.
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* @param name_index Index of name
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* @param length Content length in bytes
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* @param file Input stream
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* @throws IOException
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* @param constant_pool Array of constants
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*/
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LineNumberTable(int name_index, int length, DataInputStream file,
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ConstantPool constant_pool) throws IOException
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{
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this(name_index, length, (LineNumber[])null, constant_pool);
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line_number_table_length = (file.readUnsignedShort());
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line_number_table = new LineNumber[line_number_table_length];
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for(int i=0; i < line_number_table_length; i++)
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line_number_table[i] = new LineNumber(file);
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}
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/**
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* Called by objects that are traversing the nodes of the tree implicitely
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* defined by the contents of a Java class. I.e., the hierarchy of methods,
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* fields, attributes, etc. spawns a tree of objects.
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*
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* @param v Visitor object
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*/
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public void accept(Visitor v) {
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v.visitLineNumberTable(this);
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}
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/**
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* Dump line number table attribute to file stream in binary format.
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*
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* @param file Output file stream
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* @throws IOException
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*/
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public final void dump(DataOutputStream file) throws IOException
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{
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super.dump(file);
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file.writeShort(line_number_table_length);
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for(int i=0; i < line_number_table_length; i++)
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line_number_table[i].dump(file);
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}
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/**
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* @return Array of (pc offset, line number) pairs.
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*/
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public final LineNumber[] getLineNumberTable() { return line_number_table; }
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/**
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* @param line_number_table.
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*/
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public final void setLineNumberTable(LineNumber[] line_number_table) {
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this.line_number_table = line_number_table;
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line_number_table_length = (line_number_table == null)? 0 :
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line_number_table.length;
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}
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/**
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* @return String representation.
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*/
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public final String toString() {
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StringBuffer buf = new StringBuffer();
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StringBuffer line = new StringBuffer();
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for(int i=0; i < line_number_table_length; i++) {
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line.append(line_number_table[i].toString());
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if(i < line_number_table_length - 1)
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line.append(", ");
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if(line.length() > 72) {
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line.append('\n');
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buf.append(line);
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line.setLength(0);
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}
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}
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buf.append(line);
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return buf.toString();
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}
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/**
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* Map byte code positions to source code lines.
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*
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* @param pos byte code offset
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* @return corresponding line in source code
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*/
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public int getSourceLine(int pos) {
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int l = 0, r = line_number_table_length-1;
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if(r < 0) // array is empty
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return -1;
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int min_index = -1, min=-1;
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/* Do a binary search since the array is ordered.
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*/
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do {
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int i = (l + r) / 2;
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int j = line_number_table[i].getStartPC();
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if(j == pos)
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return line_number_table[i].getLineNumber();
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else if(pos < j) // else constrain search area
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r = i - 1;
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else // pos > j
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l = i + 1;
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/* If exact match can't be found (which is the most common case)
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* return the line number that corresponds to the greatest index less
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* than pos.
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*/
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if(j < pos && j > min) {
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min = j;
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min_index = i;
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}
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} while(l <= r);
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/* It's possible that we did not find any valid entry for the bytecode
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* offset we were looking for.
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*/
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if (min_index < 0)
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return -1;
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return line_number_table[min_index].getLineNumber();
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}
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/**
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* @return deep copy of this attribute
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*/
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public Attribute copy(ConstantPool constant_pool) {
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LineNumberTable c = (LineNumberTable)clone();
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c.line_number_table = new LineNumber[line_number_table_length];
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for(int i=0; i < line_number_table_length; i++)
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c.line_number_table[i] = line_number_table[i].copy();
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c.constant_pool = constant_pool;
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return c;
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}
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public final int getTableLength() { return line_number_table_length; }
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}
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