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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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/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2016-17 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 (https://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 [email protected].
 *
 * 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
 * .
 */
package org.aspectj.apache.bcel.classfile;

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

import org.aspectj.apache.bcel.Constants;

/**
 * This class is derived from Attribute and represents the module
 * information captured in a class file.
 * https://cr.openjdk.java.net/~mr/jigsaw/spec/lang-vm.html
 * https://cr.openjdk.java.net/~mr/jigsaw/spec/java-se-9-jvms-diffs.pdf 4.7.25
 *
 * @author Andy Clement
 */
public final class Module extends Attribute {

	private static final String[] NO_MODULE_NAMES = {};

	private int moduleNameIndex;    // u2 module_name_index
	private int moduleFlags;        // u2 module_flags
	private int moduleVersionIndex; // u2 module_version_index
	private Require[] requires;
	private Export[] exports;
	private Open[] opens;
	private Uses[] uses;
	private Provide[] provides;

	private byte[] moduleInfo;
	private int ptr;
	private boolean unpacked = false;

	public Module(Module module) {
		super(module.getTag(), module.getNameIndex(), module.getLength(), module.getConstantPool());
		moduleInfo = module.getBytes();
	}

	public Module(int nameIndex, int length, byte[] data, ConstantPool cp) {
		super(Constants.ATTR_MODULE, nameIndex, length, cp);
	}

	Module(int nameIndex, int length, DataInputStream stream, ConstantPool cp) throws IOException {
		this(nameIndex, length, (byte[])null, cp);
		moduleInfo = new byte[length];
		stream.read(moduleInfo);
		unpacked = false;
	}

	public class Require {

		private final int moduleIndex;
		private final int flags;
		private final int versionIndex;

		public Require(int moduleIndex, int flags, int versionIndex) {
			this.moduleIndex = moduleIndex;
			this.flags = flags;
			this.versionIndex = versionIndex;
		}

		public String getModuleName() {
			return cpool.getModuleName(moduleIndex);
		}

		public int getFlags() {
			return flags;
		}

		public int getVersionIndex() {
			return versionIndex;
		}

		public String getVersionString() {
			if (versionIndex == 0) {
				return null;
			} else {
				return cpool.getConstantUtf8(versionIndex).getValue();
			}
		}

		public String getFlagsAsString() {
			StringBuilder s = new StringBuilder();
			if ((flags & Constants.MODULE_ACC_TRANSITIVE)!=0) {
				s.append(" transitive");
			}
			if ((flags & Constants.MODULE_ACC_STATIC_PHASE)!=0) {
				s.append(" static");
			}
			if ((flags & Constants.MODULE_ACC_SYNTHETIC)!=0) {
				s.append(" synthetic");
			}
			if ((flags & Constants.MODULE_ACC_MANDATED)!=0) {
				s.append(" mandated");
			}
			return s.toString();
		}

		public String toString() {
			return "requires"+getFlagsAsString()+" "+getModuleName()+(versionIndex==0?"":" "+getVersionString());
		}
	}


	public class Export {

		private final int packageIndex;
		private final int flags;
		private final int[] toModuleIndices;

		public Export(int packageIndex, int flags, int[] toModuleIndices) {
			this.packageIndex = packageIndex;
			this.flags = flags;
			this.toModuleIndices = toModuleIndices;
		}

		public int getPackageIndex() {
			return packageIndex;
		}

		public int getFlags() {
			return flags;
		}

		public int[] getToModuleIndices() {
			return toModuleIndices;
		}

		public String getPackage() {
			return cpool.getPackageName(packageIndex);
		}

		public String getFlagsAsString() {
			StringBuilder s = new StringBuilder();
			if ((flags & Constants.MODULE_ACC_SYNTHETIC)!=0) {
				s.append(" synthetic");
			}
			if ((flags & Constants.MODULE_ACC_MANDATED)!=0) {
				s.append(" synthetic");
			}
			return s.toString();
		}

		public String[] getToModuleNames() {
			if (toModuleIndices==null) {
				return NO_MODULE_NAMES;
			}
			String[] toModuleNames = new String[toModuleIndices.length];
			for (int i=0;i0) {
						s.append(", ");
					}
					s.append(toModules[i]);
				}
			}
			return s.toString().trim();
		}
	}


	public class Open {

		private final int packageIndex;
		private final int flags;
		private final int[] toModuleIndices;

		public Open(int packageIndex, int flags, int[] toModuleIndices) {
			this.packageIndex = packageIndex;
			this.flags = flags;
			this.toModuleIndices = toModuleIndices;
		}

		public int getPackageIndex() {
			return packageIndex;
		}

		public int getFlags() {
			return flags;
		}

		public int[] getToModuleIndices() {
			return toModuleIndices;
		}

		public String getPackage() {
			return cpool.getPackageName(packageIndex);
		}

		public String getFlagsAsString() {
			StringBuilder s = new StringBuilder();
			if ((flags & Constants.MODULE_ACC_SYNTHETIC)!=0) {
				s.append(" synthetic");
			}
			if ((flags & Constants.MODULE_ACC_MANDATED)!=0) {
				s.append(" synthetic");
			}
			return s.toString();
		}

		public String[] getToModuleNames() {
			if (toModuleIndices==null) {
				return NO_MODULE_NAMES;
			}
			String[] toModuleNames = new String[toModuleIndices.length];
			for (int i=0;i0) {
						s.append(", ");
					}
					s.append(toModules[i]);
				}
			}
			return s.toString().trim();
		}
	}

	public class Provide {
		private final int providedTypeIndex;
		private final int[] withTypeIndices;

		public Provide(int providedTypeIndex, int[] withTypeIndices) {
			this.providedTypeIndex = providedTypeIndex;
			this.withTypeIndices = withTypeIndices;
		}

		public String getProvidedType() {
			return cpool.getConstantString_CONSTANTClass(providedTypeIndex);
		}

		public int getProvidedTypeIndex() {
			return providedTypeIndex;
		}

		public String[] getWithTypeStrings() {
			String[] result = new String[withTypeIndices.length];
			for (int i=0;i0) s.append(",");
				s.append(withtypes[i].replace('/','.'));
			}
			return s.toString();
		}
	}

	public class Uses {
		private final int typeNameIndex;

		public Uses(int typeNameIndex) {
			this.typeNameIndex = typeNameIndex;
		}

		public String getTypeName() {
			return  cpool.getConstantString_CONSTANTClass(typeNameIndex);
		}

		public int getTypeNameIndex() {
			return typeNameIndex;
		}

		public String toString() {
			StringBuilder s =new StringBuilder();
			s.append("uses ").append(getTypeName().replace('/', '.'));
			return s.toString().trim();
		}
	}

	private final int readInt() {
		return ((moduleInfo[ptr++] & 0xFF) << 24) + ((moduleInfo[ptr++] & 0xFF) << 16)
				+ ((moduleInfo[ptr++] & 0xFF) << 8) + (moduleInfo[ptr++] & 0xFF);
	}

	private final int readUnsignedShort() {
		return ((moduleInfo[ptr++] & 0xff) << 8) + (moduleInfo[ptr++] & 0xff);
	}

	private final int readUnsignedShort(int offset) {
		return ((moduleInfo[offset++] & 0xff) << 8) + (moduleInfo[offset] & 0xff);
	}

	// Format: https://cr.openjdk.java.net/~mr/jigsaw/spec/java-se-9-jvms-diffs.pdf 4.7.25
	private void ensureUnpacked() {
		if (!unpacked) {
			ptr = 0;
			moduleNameIndex = readUnsignedShort();
			moduleFlags = readUnsignedShort();
			moduleVersionIndex = readUnsignedShort();

			int count = readUnsignedShort();
			requires = new Require[count];
			for (int i = 0; i < count; i++) {
				requires[i] = new Require(readUnsignedShort(), readUnsignedShort(), readUnsignedShort());
			}

			count = readUnsignedShort();
			exports = new Export[count];
			for (int i = 0; i < count; i++) {
				int index = readUnsignedShort();
				int flags = readUnsignedShort();
				int toCount = readUnsignedShort();
				int[] to = new int[toCount];
				for (int j = 0; j < toCount; j++) {
					to[j] = readUnsignedShort();
				}
				exports[i] = new Export(index, flags, to);
			}

			count = readUnsignedShort();
			opens = new Open[count];
			for (int i = 0; i < count; i++) {
				int index = readUnsignedShort();
				int flags = readUnsignedShort();
				int toCount = readUnsignedShort();
				int[] to = new int[toCount];
				for (int j = 0; j < toCount; j++) {
					to[j] = readUnsignedShort();
				}
				opens[i] = new Open(index, flags, to);
			}
			count = readUnsignedShort();
			uses = new Uses[count];
			for (int i = 0; i < count; i++) {
				uses[i] = new Uses(readUnsignedShort());
			}
			count = readUnsignedShort();
			provides = new Provide[count];
			for (int i = 0; i < count; i++) {
				int index = readUnsignedShort();
				int toCount = readUnsignedShort();
				int[] to = new int[toCount];
				for (int j = 0; j < toCount; j++) {
					to[j] = readUnsignedShort();
				}
				provides[i] = new Provide(index, to);
			}
			unpacked = true;
		}
	}

	@Override
	public final void dump(DataOutputStream file) throws IOException {
		super.dump(file);
		if (!unpacked) {
			file.write(moduleInfo);
		} else {

			file.writeShort(moduleNameIndex);
			file.writeShort(moduleFlags);
			file.writeShort(moduleVersionIndex);

			file.writeShort(requires.length);
			for (Require require : requires) {
				file.writeShort(require.moduleIndex);
				file.writeShort(require.flags);
				file.writeShort(require.versionIndex);
			}
			file.writeShort(exports.length);
			for (Export export : exports) {
				file.writeShort(export.packageIndex);
				int[] toIndices = export.toModuleIndices;
				file.writeShort(toIndices.length);
				for (int index : toIndices) {
					file.writeShort(index);
				}
			}
			file.writeShort(opens.length);
			for (Open open : opens) {
				file.writeShort(open.packageIndex);
				int[] toIndices = open.toModuleIndices;
				file.writeShort(toIndices.length);
				for (int index : toIndices) {
					file.writeShort(index);
				}
			}
			file.writeShort(uses.length);
			for (Uses use : uses) {
				file.writeShort(use.getTypeNameIndex());
			}
			file.writeShort(provides.length);
			for (Provide provide : provides) {
				file.writeShort(provide.providedTypeIndex);
				int[] toIndices = provide.withTypeIndices;
				file.writeShort(toIndices.length);
				for (int index : toIndices) {
					file.writeShort(index);
				}
			}
		}
	}

	public String toStringRequires() {
		StringBuilder s = new StringBuilder();
		s.append('#').append(requires.length);
		if (requires.length > 0) {
			for (Require require : requires) {
				s.append(' ');
				s.append(require.moduleIndex).append(':').append(require.flags);
			}
		}
		return s.toString();
	}

	public String toStringExports() {
		StringBuilder s = new StringBuilder();
		s.append('#').append(exports.length);
		if (exports.length > 0) {
			for (Export export : exports) {
				s.append(' ');
				s.append(export.packageIndex).append(":[");
				int[] toIndices = export.toModuleIndices;
				for (int i = 0; i < toIndices.length; i++) {
					if (i > 0)
						s.append(',');
					s.append(toIndices[i]);
				}
				s.append("]");
			}
		}
		return s.toString();
	}

	public String toStringOpens() {
		StringBuilder s = new StringBuilder();
		s.append('#').append(opens.length);
		if (opens.length > 0) {
			for (Open open : opens) {
				s.append(' ');
				s.append(open.packageIndex).append(":[");
				int[] toIndices = open.toModuleIndices;
				for (int i = 0; i < toIndices.length; i++) {
					if (i > 0)
						s.append(',');
					s.append(toIndices[i]);
				}
				s.append("]");
			}
		}
		return s.toString();
	}

	public String toStringUses() {
		StringBuilder s = new StringBuilder();
		s.append('#').append(uses.length);
		if (uses.length > 0) {
			for (Uses use : uses) {
				s.append(' ');
				s.append(use.getTypeName());
			}
		}
		return s.toString();
	}

	public String toStringProvides() {
		StringBuilder s = new StringBuilder();
		s.append('#').append(provides.length);
		if (provides.length > 0) {
			for (Provide provide : provides) {
				s.append(' ');
				s.append(provide.providedTypeIndex).append(":[");
				int[] indices = provide.withTypeIndices;
				for (int i = 0; i < indices.length; i++) {
					if (i > 0)
						s.append(',');
					s.append(indices[i]);
				}
				s.append("]");
			}
		}
		return s.toString();
	}

	@Override
	public final String toString() {
		StringBuilder s = new StringBuilder();
		ensureUnpacked();
		s.append("Module(");
		if (requires.length != 0) {
			s.append("requires=");
			s.append(toStringRequires());
			s.append(" ");
		}
		if (exports.length != 0) {
			s.append("exports=");
			s.append(toStringExports());
			s.append(" ");
		}
		if (opens.length != 0) {
			s.append("opens=");
			s.append(toStringOpens());
			s.append(" ");
		}
		if (uses.length != 0) {
			s.append("uses=");
			s.append(toStringUses());
			s.append(" ");
		}
		if (provides.length != 0) {
			s.append("provides=");
			s.append(toStringProvides());
			s.append(" ");
		}
		return s.toString().trim()+")";
	}

	/**
	 * @return deep copy of this attribute //
	 */
//	 @Override
//	 public Attribute copy(ConstantPool constant_pool) {
//		 return (Module) clone();
//	 }

	@Override
	public void accept(ClassVisitor v) {
		v.visitModule(this);
	}

	public Require[] getRequires() {
		ensureUnpacked();
		return requires;
	}

	public String[] getRequiredModuleNames() {
		ensureUnpacked();
		String[] results = new String[requires.length];
		for (int i=0;i




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