|
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242 |
- 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 collection of local variables in a method. This attribute is contained in the <em>Code</em> attribute.
- *
- * @version $Id: LocalVariableTable.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
- * @see LocalVariable Updates: Andy 14Feb06 - Made unpacking of the data lazy, depending on someone actually asking for it.
- */
- public class LocalVariableTable extends Attribute {
-
- // if 'isInPackedState' then this data needs unpacking
- private boolean isInPackedState = false;
- private byte[] data;
-
- private int localVariableTableLength;
- private LocalVariable[] localVariableTable;
-
- /**
- * Initialize from another object. Note that both objects use the same references (shallow copy). Use copy() for a physical
- * copy.
- */
- public LocalVariableTable(LocalVariableTable c) {
- this(c.getNameIndex(), c.getLength(), c.getLocalVariableTable(), c.getConstantPool());
- }
-
- /**
- * @param name_index Index in constant pool to `LocalVariableTable'
- * @param length Content length in bytes
- * @param local_variable_table Table of local variables
- * @param constant_pool Array of constants
- */
- public LocalVariableTable(int name_index, int length, LocalVariable[] local_variable_table, ConstantPool constant_pool) {
- super(Constants.ATTR_LOCAL_VARIABLE_TABLE, name_index, length, constant_pool);
- setLocalVariableTable(local_variable_table);
- }
-
- /**
- * Construct object from file stream.
- *
- * @param name_index Index in constant pool
- * @param length Content length in bytes
- * @param file Input stream
- * @param constant_pool Array of constants
- * @throws IOException
- */
- LocalVariableTable(int name_index, int length, DataInputStream file, ConstantPool constant_pool) throws IOException {
- super(Constants.ATTR_LOCAL_VARIABLE_TABLE, name_index, length, constant_pool);
- data = new byte[length];
- file.readFully(data);
- isInPackedState = true;
- // assert(bytesRead==length)
- }
-
- /**
- * 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.visitLocalVariableTable(this);
- }
-
- /**
- * Dump local variable table attribute to file stream in binary format.
- *
- * @param file Output file stream
- * @throws IOException
- */
- @Override
- public final synchronized void dump(DataOutputStream file) throws IOException {
- super.dump(file);
- if (isInPackedState) {
- file.write(data);
- } else {
- file.writeShort(localVariableTableLength);
- for (int i = 0; i < localVariableTableLength; i++)
- localVariableTable[i].dump(file);
- }
- }
-
- /**
- * @return Array of local variables of method.
- */
- public final LocalVariable[] getLocalVariableTable() {
- unpack();
- return localVariableTable;
- }
-
- /**
- * @return first matching variable using index
- */
- public final LocalVariable getLocalVariable(int index) {
- unpack();
- for (int i = 0; i < localVariableTableLength; i++) {
- if (localVariableTable[i] != null && localVariableTable[i].getIndex() == index) {
- return localVariableTable[i];
- }
- }
- return null;
- }
-
- public synchronized final void setLocalVariableTable(LocalVariable[] local_variable_table) {
- data = null;
- isInPackedState = false;
- this.localVariableTable = local_variable_table;
- localVariableTableLength = (local_variable_table == null) ? 0 : local_variable_table.length;
- }
-
- /**
- * @return String representation.
- */
- @Override
- public final String toString() {
- StringBuilder buf = new StringBuilder("");
- unpack();
- for (int i = 0; i < localVariableTableLength; i++) {
- buf.append(localVariableTable[i].toString());
-
- if (i < localVariableTableLength - 1)
- buf.append('\n');
- }
-
- return buf.toString();
- }
-
- /**
- * Returns copy of this attribute using same packed state. Used in unit tests.
- */
- public synchronized LocalVariableTable copyFromPackedState() {
- if (!isInPackedState) throw new IllegalStateException("No in packed state");
- try {
- return new LocalVariableTable(nameIndex, length, new DataInputStream(new ByteArrayInputStream(data)), getConstantPool());
- } catch (IOException e) {
- throw new RuntimeException("Failed to unpack clone", e);
- }
- }
-
- /**
- * @return deep copy of this attribute
- */
- // public Attribute copy(ConstantPool constant_pool) {
- // unpack();
- // LocalVariableTable c = (LocalVariableTable) clone();
- //
- // c.localVariableTable = new LocalVariable[localVariableTableLength];
- // for (int i = 0; i < localVariableTableLength; i++)
- // c.localVariableTable[i] = localVariableTable[i].copy();
- //
- // c.cpool = constant_pool;
- // return c;
- // }
- public final int getTableLength() {
- unpack();
- return localVariableTableLength;
- }
-
- // ---
- // Unpacks the byte array into the table
- private synchronized void unpack() {
- if (!isInPackedState)
- return;
- try {
- ByteArrayInputStream bs = new ByteArrayInputStream(data);
- DataInputStream dis = new DataInputStream(bs);
- localVariableTableLength = (dis.readUnsignedShort());
- localVariableTable = new LocalVariable[localVariableTableLength];
- for (int i = 0; i < localVariableTableLength; i++)
- localVariableTable[i] = new LocalVariable(dis, cpool);
- dis.close();
- data = null; // throw it away now
- } catch (IOException e) {
- throw new RuntimeException("Unpacking of LocalVariableTable attribute failed", e);
- }
- isInPackedState = false;
- }
- }
|