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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) 2000, 2009 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.aspectj.org.eclipse.jdt.internal.core.util;

import org.aspectj.org.eclipse.jdt.core.util.ClassFormatException;
import org.aspectj.org.eclipse.jdt.core.util.IConstantPool;
import org.aspectj.org.eclipse.jdt.core.util.IStackMapFrame;
import org.aspectj.org.eclipse.jdt.core.util.IStackMapAttribute;
/**
 * Default implementation of IStackMapAttribute.
 * @see IStackMapAttribute
 */
public class StackMapAttribute
	extends ClassFileAttribute
	implements IStackMapAttribute {

	private static final IStackMapFrame[] NO_FRAMES = new IStackMapFrame[0];
	private static final byte[] NO_ENTRIES = new byte[0];

	private int numberOfEntries;
	private IStackMapFrame[] frames;

	private byte[] bytes;

	/**
	 * Constructor for LineNumberAttribute.
	 * @param classFileBytes
	 * @param constantPool
	 * @param offset
	 * @throws ClassFormatException
	 */
	public StackMapAttribute(
			byte[] classFileBytes,
			IConstantPool constantPool,
			int offset)
			throws ClassFormatException {
		super(classFileBytes, constantPool, offset);

		final int length = u2At(classFileBytes, 6, offset);
		this.numberOfEntries = length;
		if (length != 0) {
			int readOffset = 8;
			this.frames = new IStackMapFrame[length];
			for (int i = 0; i < length; i++) {
				DefaultStackMapFrame frame = new DefaultStackMapFrame(classFileBytes, constantPool, offset + readOffset);
				this.frames[i] = frame;
				readOffset += frame.sizeInBytes();
			}
		} else {
			this.frames = NO_FRAMES;
		}
		final int byteLength = (int) u4At(classFileBytes, 2, offset);

		if (length != 0) {
			System.arraycopy(classFileBytes, offset + 6, this.bytes = new byte[byteLength], 0, byteLength);
		} else {
			this.bytes = NO_ENTRIES;
		}
	}

	@Override
	public int getNumberOfEntries() {
		return this.numberOfEntries;
	}

	@Override
	public IStackMapFrame[] getStackMapFrame() {
		return this.frames;
	}

	/**
	 */
	public byte[] getBytes() {
		return this.bytes;
	}
}