/*******************************************************************************
* Copyright (c) 2002,2006 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package com.ibm.wala.shrikeCT;
/**
* This class builds serializable Exceptions attributes.
*/
public final class ExceptionsWriter extends ClassWriter.Element {
final private int attrID;
private int[] table;
/**
* Build an empty writer.
*
* @throws IllegalArgumentException if w is null
*/
public ExceptionsWriter(ClassWriter w) {
if (w == null) {
throw new IllegalArgumentException("w is null");
}
attrID = w.addCPUtf8("Exceptions");
}
@Override
public int getSize() {
return table == null ? 8 : 8 + table.length * 2;
}
@Override
public int copyInto(byte[] buf, int offset) throws IllegalArgumentException {
ClassWriter.setUShort(buf, offset, attrID);
ClassWriter.setInt(buf, offset + 2, getSize() - 6);
ClassWriter.setUShort(buf, offset + 6, table == null ? 0 : table.length);
offset += 8;
if (table != null) {
for (int i = 0; i < table.length; i++) {
ClassWriter.setUShort(buf, offset, table[i]);
offset += 2;
}
}
return offset;
}
/**
* Set the list of exceptions that can be thrown.
*
* @param exceptions an array of indices to constant pool Class entries
* @throws IllegalArgumentException if exceptions is null
*/
public void setRawTable(int[] exceptions) {
if (exceptions == null) {
throw new IllegalArgumentException("exceptions is null");
}
for (int i = 0; i < exceptions.length; i++) {
if (exceptions[i] < 1 || exceptions[i] > 0xFFFF) {
throw new IllegalArgumentException("Invalid CP index: " + exceptions[i]);
}
}
this.table = exceptions;
}
}