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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) 2004, 2008 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.IVerificationTypeInfo;

/**
 * Default implementation of IStackMapFrame
 */
public class DefaultStackMapFrame extends ClassFileStruct implements IStackMapFrame {
	private static final IVerificationTypeInfo[] EMPTY_LOCALS_OR_STACK_ITEMS = new IVerificationTypeInfo[0];

	private int readOffset;
	private final int numberOfLocals;
	private final int numberOfStackItems;
	private IVerificationTypeInfo[] locals;
	private IVerificationTypeInfo[] stackItems;
	private final int offsetDelta;

	/**
	 * Constructor for StackMapFrame.
	 */
	public DefaultStackMapFrame(
			byte[] classFileBytes,
			IConstantPool constantPool,
			int offset) throws ClassFormatException {
		// FULL_FRAME
		this.offsetDelta = u2At(classFileBytes, 0, offset);
		int tempLocals = u2At(classFileBytes, 2, offset);
		this.numberOfLocals = tempLocals;
		this.readOffset = 4;
		if (tempLocals != 0) {
			this.locals = new IVerificationTypeInfo[tempLocals];
			for (int i = 0; i < tempLocals; i++) {
				VerificationInfo verificationInfo = new VerificationInfo(classFileBytes, constantPool, offset + this.readOffset);
				this.locals[i] = verificationInfo;
				this.readOffset += verificationInfo.sizeInBytes();
			}
		} else {
			this.locals = EMPTY_LOCALS_OR_STACK_ITEMS;
		}
		int tempStackItems = u2At(classFileBytes, this.readOffset, offset);
		this.readOffset += 2;
		this.numberOfStackItems = tempStackItems;
		if (tempStackItems != 0) {
			this.stackItems = new IVerificationTypeInfo[tempStackItems];
			for (int i = 0; i < tempStackItems; i++) {
				VerificationInfo verificationInfo = new VerificationInfo(classFileBytes, constantPool, offset + this.readOffset);
				this.stackItems[i] = verificationInfo;
				this.readOffset += verificationInfo.sizeInBytes();
			}
		} else {
			this.stackItems = EMPTY_LOCALS_OR_STACK_ITEMS;
		}
	}
	int sizeInBytes() {
		return this.readOffset;
	}
	@Override
	public int getFrameType() {
		return 255; // full_frame
	}
	@Override
	public IVerificationTypeInfo[] getLocals() {
		return this.locals;
	}
	@Override
	public int getNumberOfLocals() {
		return this.numberOfLocals;
	}
	@Override
	public int getNumberOfStackItems() {
		return this.numberOfStackItems;
	}
	@Override
	public int getOffsetDelta() {
		return this.offsetDelta;
	}
	@Override
	public IVerificationTypeInfo[] getStackItems() {
		return this.stackItems;
	}
}