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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/* *******************************************************************
 * Copyright (c) 2013 VMware
 *
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *    Andy Clement     initial implementation
 * ******************************************************************/
package org.aspectj.apache.bcel.classfile;

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

import org.aspectj.apache.bcel.Constants;

// see https://cr.openjdk.java.net/~abuckley/8misc.pdf
public class MethodParameters extends Attribute {

	public final static int[] NO_PARAMETER_NAME_INDEXES = new int[0];
	public final static int[] NO_PARAMETER_ACCESS_FLAGS = new int[0];

	public final static int ACCESS_FLAGS_FINAL     = 0x0010;
	public final static int ACCESS_FLAGS_SYNTHETIC = 0x1000;
	public final static int ACCESS_FLAGS_MANDATED  = 0x8000;

	// if 'isInPackedState' then this data needs unpacking
	private boolean isInPackedState = false;
	private byte[] data;
	private int[] names;
	private int[] accessFlags;

	public MethodParameters(int index, int length, DataInputStream dis, ConstantPool cpool) throws IOException {
		super(Constants.ATTR_METHOD_PARAMETERS,index,length,cpool);
		data = new byte[length];
		dis.readFully(data,0,length);
		isInPackedState = true;
	}

	private void ensureInflated() {
		if (names!=null) return;
		try {
			DataInputStream dis = new DataInputStream(new ByteArrayInputStream(data));
			int parametersCount = dis.readUnsignedByte();
			if (parametersCount == 0) {
				names = NO_PARAMETER_NAME_INDEXES;
				accessFlags = NO_PARAMETER_ACCESS_FLAGS;
			} else {
				names = new int[parametersCount];
				accessFlags = new int[parametersCount];
				for (int i=0;i