path: root/org.aspectj.matcher/src/org/aspectj/weaver/World.java

/* *******************************************************************
 * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
 *               2005 Contributors
 * 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: 
 *     PARC     initial implementation
 *     Adrian Colyer, Andy Clement, overhaul for generics, Abraham Nevado 
 * ******************************************************************/

package org.aspectj.weaver;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.WeakHashMap;

import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.IMessage.Kind;
import org.aspectj.bridge.IMessageHandler;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.bridge.Message;
import org.aspectj.bridge.MessageUtil;
import org.aspectj.bridge.context.PinpointingMessageHandler;
import org.aspectj.util.IStructureModel;
import org.aspectj.weaver.UnresolvedType.TypeKind;
import org.aspectj.weaver.patterns.Declare;
import org.aspectj.weaver.patterns.DeclareAnnotation;
import org.aspectj.weaver.patterns.DeclareParents;
import org.aspectj.weaver.patterns.DeclarePrecedence;
import org.aspectj.weaver.patterns.DeclareSoft;
import org.aspectj.weaver.patterns.DeclareTypeErrorOrWarning;
import org.aspectj.weaver.patterns.Pointcut;
import org.aspectj.weaver.patterns.TypePattern;
import org.aspectj.weaver.tools.PointcutDesignatorHandler;
import org.aspectj.weaver.tools.Trace;
import org.aspectj.weaver.tools.TraceFactory;

/**
 * A World is a collection of known types and crosscutting members.
 */
public abstract class World implements Dump.INode {
	/** handler for any messages produced during resolution etc. */
	private IMessageHandler messageHandler = IMessageHandler.SYSTEM_ERR;

	/**
	 * handler for cross-reference information produced during the weaving process
	 */
	private ICrossReferenceHandler xrefHandler = null;

	/**
	 * Currently 'active' scope in which to lookup (resolve) typevariable references
	 */
	private TypeVariableDeclaringElement typeVariableLookupScope;

	/** The heart of the world, a map from type signatures to resolved types */
	protected TypeMap typeMap = new TypeMap(this); // Signature to ResolvedType

	/** New pointcut designators this world supports */
	private Set<PointcutDesignatorHandler> pointcutDesignators;

	// see pr145963
	/** Should we create the hierarchy for binary classes and aspects */
	public static boolean createInjarHierarchy = true;

	/** Calculator for working out aspect precedence */
	private final AspectPrecedenceCalculator precedenceCalculator;

	/** All of the type and shadow mungers known to us */
	private final CrosscuttingMembersSet crosscuttingMembersSet = new CrosscuttingMembersSet(this);

	/** The structure model for the compilation */
	private IStructureModel model = null;

	/** for processing Xlint messages */
	private Lint lint = new Lint(this);

	/** XnoInline option setting passed down to weaver */
	private boolean XnoInline;

	/** XlazyTjp option setting passed down to weaver */
	private boolean XlazyTjp;

	/** XhasMember option setting passed down to weaver */
	private boolean XhasMember = false;

	/**
	 * Xpinpoint controls whether we put out developer info showing the source of messages
	 */
	private boolean Xpinpoint = false;

	/** When behaving in a Java 5 way autoboxing is considered */
	private boolean behaveInJava5Way = false;

	/** Should timing information be reported (as info messages)? */
	private boolean timing = false;
	private boolean timingPeriodically = true;

	/** Determines if this world could be used for multiple compiles */
	private boolean incrementalCompileCouldFollow = false;

	/** The level of the aspectjrt.jar the code we generate needs to run on */
	private String targetAspectjRuntimeLevel = Constants.RUNTIME_LEVEL_DEFAULT;

	/** Flags for the new joinpoints that are 'optional' */
	private boolean optionalJoinpoint_ArrayConstruction = false; // Command line
	// flag:
	// "-Xjoinpoints:arrayconstruction"
	private boolean optionalJoinpoint_Synchronization = false; // Command line
	// flag:
	// "-Xjoinpoints:synchronization"

	private boolean addSerialVerUID = false;

	private Properties extraConfiguration = null;
	private boolean checkedAdvancedConfiguration = false;
	private boolean synchronizationPointcutsInUse = false;
	// Xset'table options
	private boolean runMinimalMemory = false;
	private boolean runMinimalMemorySet = false;
	private boolean shouldPipelineCompilation = true;
	private boolean shouldGenerateStackMaps = false;
	protected boolean bcelRepositoryCaching = xsetBCEL_REPOSITORY_CACHING_DEFAULT.equalsIgnoreCase("true");
	private boolean fastMethodPacking = false;
	private int itdVersion = 2; // defaults to 2nd generation itds

	// Minimal Model controls whether model entities that are not involved in relationships are deleted post-build
	private boolean minimalModel = false;
	private boolean targettingRuntime1_6_10 = false;

	private boolean completeBinaryTypes = false;
	private boolean overWeaving = false;
	public boolean forDEBUG_structuralChangesCode = false;
	public boolean forDEBUG_bridgingCode = false;
	public boolean optimizedMatching = true;
	protected long timersPerJoinpoint = 25000;
	protected long timersPerType = 250;

	public int infoMessagesEnabled = 0; // 0=uninitialized, 1=no, 2=yes

	private static Trace trace = TraceFactory.getTraceFactory().getTrace(World.class);

	private long errorThreshold;
	private long warningThreshold;

	/**
	 * A list of RuntimeExceptions containing full stack information for every type we couldn't find.
	 */
	private List<RuntimeException> dumpState_cantFindTypeExceptions = null;

	/**
	 * Play God. On the first day, God created the primitive types and put them in the type map.
	 */
	protected World() {
		super();
		if (trace.isTraceEnabled()) {
			trace.enter("<init>", this);
		}
		// Dump.registerNode(this.getClass(), this);
		typeMap.put("B", ResolvedType.BYTE);
		typeMap.put("S", ResolvedType.SHORT);
		typeMap.put("I", ResolvedType.INT);
		typeMap.put("J", ResolvedType.LONG);
		typeMap.put("F", ResolvedType.FLOAT);
		typeMap.put("D", ResolvedType.DOUBLE);
		typeMap.put("C", ResolvedType.CHAR);
		typeMap.put("Z", ResolvedType.BOOLEAN);
		typeMap.put("V", ResolvedType.VOID);
		precedenceCalculator = new AspectPrecedenceCalculator(this);
		if (trace.isTraceEnabled()) {
			trace.exit("<init>");
		}
	}

	/**
	 * Dump processing when a fatal error occurs
	 */
	public void accept(Dump.IVisitor visitor) {
		// visitor.visitObject("Extra configuration:");
		// visitor.visitList(extraConfiguration.);
		visitor.visitObject("Shadow mungers:");
		visitor.visitList(crosscuttingMembersSet.getShadowMungers());
		visitor.visitObject("Type mungers:");
		visitor.visitList(crosscuttingMembersSet.getTypeMungers());
		visitor.visitObject("Late Type mungers:");
		visitor.visitList(crosscuttingMembersSet.getLateTypeMungers());
		if (dumpState_cantFindTypeExceptions != null) {
			visitor.visitObject("Cant find type problems:");
			visitor.visitList(dumpState_cantFindTypeExceptions);
			dumpState_cantFindTypeExceptions = null;
		}
	}

	// ==========================================================================
	// ===
	// T Y P E R E S O L U T I O N
	// ==========================================================================
	// ===

	/**
	 * Resolve a type that we require to be present in the world
	 */
	public ResolvedType resolve(UnresolvedType ty) {
		return resolve(ty, false);
	}

	/**
	 * Attempt to resolve a type - the source location gives you some context in which resolution is taking place. In the case of an
	 * error where we can't find the type - we can then at least report why (source location) we were trying to resolve it.
	 */
	public ResolvedType resolve(UnresolvedType ty, ISourceLocation isl) {
		ResolvedType ret = resolve(ty, true);
		if (ResolvedType.isMissing(ty)) {
			// IMessage msg = null;
			getLint().cantFindType.signal(WeaverMessages.format(WeaverMessages.CANT_FIND_TYPE, ty.getName()), isl);
			// if (isl!=null) {
			// msg = MessageUtil.error(WeaverMessages.format(WeaverMessages.
			// CANT_FIND_TYPE,ty.getName()),isl);
			// } else {
			// msg = MessageUtil.error(WeaverMessages.format(WeaverMessages.
			// CANT_FIND_TYPE,ty.getName()));
			// }
			// messageHandler.handleMessage(msg);
		}
		return ret;
	}

	/**
	 * Convenience method for resolving an array of unresolved types in one hit. Useful for e.g. resolving type parameters in
	 * signatures.
	 */
	public ResolvedType[] resolve(UnresolvedType[] types) {
		if (types == null) {
			return ResolvedType.NONE;
		}

		ResolvedType[] ret = new ResolvedType[types.length];
		for (int i = 0; i < types.length; i++) {
			ret[i] = resolve(types[i]);
		}
		return ret;
	}

	/**
	 * Resolve a type. This the hub of type resolution. The resolved type is added to the type map by signature.
	 */
	public ResolvedType resolve(UnresolvedType ty, boolean allowMissing) {

		// special resolution processing for already resolved types.
		if (ty instanceof ResolvedType) {
			ResolvedType rty = (ResolvedType) ty;
			rty = resolve(rty);
			return rty;
		}

		// dispatch back to the type variable reference to resolve its
		// constituent parts
		// don't do this for other unresolved types otherwise you'll end up in a
		// loop
		if (ty.isTypeVariableReference()) {
			return ty.resolve(this);
		}

		// if we've already got a resolved type for the signature, just return
		// it
		// after updating the world
		String signature = ty.getSignature();
		ResolvedType ret = typeMap.get(signature);
		if (ret != null) {
			ret.world = this; // Set the world for the RTX
			return ret;
		} else if (signature.equals("?") || signature.equals("*")) {
			// might be a problem here, not sure '?' should make it to here as a
			// signature, the
			// proper signature for wildcard '?' is '*'
			// fault in generic wildcard, can't be done earlier because of init
			// issues
			// TODO ought to be shared single instance representing this
			ResolvedType something = getWildcard();
			typeMap.put("?", something);
			return something;
		}

		// no existing resolved type, create one
		if (ty.isArray()) {
			ResolvedType componentType = resolve(ty.getComponentType(), allowMissing);
			// String brackets =
			// signature.substring(0,signature.lastIndexOf("[")+1);
			ret = new ArrayReferenceType(signature, "[" + componentType.getErasureSignature(), this, componentType);
		} else {
			ret = resolveToReferenceType(ty, allowMissing);
			if (!allowMissing && ret.isMissing()) {
				ret = handleRequiredMissingTypeDuringResolution(ty);
			}
			if (completeBinaryTypes) {
				completeBinaryType(ret);
			}
		}

		// Pulling in the type may have already put the right entry in the map
		ResolvedType result = typeMap.get(signature);
		if (result == null && !ret.isMissing()) {
			ret = ensureRawTypeIfNecessary(ret);
			typeMap.put(signature, ret);
			return ret;
		}
		if (result == null) {
			return ret;
		} else {
			return result;
		}
	}

	// Only need one representation of '?' in a world - can be shared
	private BoundedReferenceType wildcard;

	private BoundedReferenceType getWildcard() {
		if (wildcard == null) {
			wildcard = new BoundedReferenceType(this);
		}
		return wildcard;
	}

	/**
	 * Called when a type is resolved - enables its type hierarchy to be finished off before we proceed
	 */
	protected void completeBinaryType(ResolvedType ret) {
	}

	/**
	 * Return true if the classloader relating to this world is definetly the one that will define the specified class. Return false
	 * otherwise or we don't know for certain.
	 */
	public boolean isLocallyDefined(String classname) {
		return false;
	}

	/**
	 * We tried to resolve a type and couldn't find it...
	 */
	private ResolvedType handleRequiredMissingTypeDuringResolution(UnresolvedType ty) {
		// defer the message until someone asks a question of the type that we
		// can't answer
		// just from the signature.
		// MessageUtil.error(messageHandler,
		// WeaverMessages.format(WeaverMessages.CANT_FIND_TYPE,ty.getName()));
		if (dumpState_cantFindTypeExceptions == null) {
			dumpState_cantFindTypeExceptions = new ArrayList<RuntimeException>();
		}
		if (dumpState_cantFindTypeExceptions.size() < 100) { // limit growth
			dumpState_cantFindTypeExceptions.add(new RuntimeException("Can't find type " + ty.getName()));
		}
		return new MissingResolvedTypeWithKnownSignature(ty.getSignature(), this);
	}

	/**
	 * Some TypeFactory operations create resolved types directly, but these won't be in the typeMap - this resolution process puts
	 * them there. Resolved types are also told their world which is needed for the special autoboxing resolved types.
	 */
	public ResolvedType resolve(ResolvedType ty) {
		if (ty.isTypeVariableReference()) {
			return ty; // until type variables have proper sigs...
		}
		ResolvedType resolved = typeMap.get(ty.getSignature());
		if (resolved == null) {
			resolved = ensureRawTypeIfNecessary(ty);
			typeMap.put(ty.getSignature(), resolved);
			resolved = ty;
		}
		resolved.world = this;
		return resolved;
	}

	/**
	 * When the world is operating in 1.5 mode, the TypeMap should only contain RAW types and never directly generic types. The RAW
	 * type will contain a reference to the generic type.
	 * 
	 * @param type a possibly generic type for which the raw needs creating as it is not currently in the world
	 * @return a type suitable for putting into the world
	 */
	private ResolvedType ensureRawTypeIfNecessary(ResolvedType type) {
		if (!isInJava5Mode() || type.isRawType()) {
			return type;
		}
		// Key requirement here is if it is generic, create a RAW entry to be put in the map that points to it
		if (type instanceof ReferenceType && ((ReferenceType) type).getDelegate() != null && type.isGenericType()) {
			ReferenceType rawType = new ReferenceType(type.getSignature(), this);
			rawType.typeKind = UnresolvedType.TypeKind.RAW;
			ReferenceTypeDelegate delegate = ((ReferenceType) type).getDelegate();
			rawType.setDelegate(delegate);
			rawType.setGenericType((ReferenceType) type);
			return rawType;
		}
		// probably parameterized...
		return type;
	}

	/**
	 * Convenience method for finding a type by name and resolving it in one step.
	 */
	public ResolvedType resolve(String name) {
		// trace.enter("resolve", this, new Object[] {name});
		ResolvedType ret = resolve(UnresolvedType.forName(name));
		// trace.exit("resolve", ret);
		return ret;
	}

	public ReferenceType resolveToReferenceType(String name) {
		return (ReferenceType) resolve(name);
	}

	public ResolvedType resolve(String name, boolean allowMissing) {
		return resolve(UnresolvedType.forName(name), allowMissing);
	}

	/**
	 * Resolve to a ReferenceType - simple, raw, parameterized, or generic. Raw, parameterized, and generic versions of a type share
	 * a delegate.
	 */
	private final ResolvedType resolveToReferenceType(UnresolvedType ty, boolean allowMissing) {
		if (ty.isParameterizedType()) {
			// ======= parameterized types ================
			ResolvedType rt = resolveGenericTypeFor(ty, allowMissing);
			if (rt.isMissing()) {
				return rt;
			}
			ReferenceType genericType = (ReferenceType) rt;
			ReferenceType parameterizedType = TypeFactory.createParameterizedType(genericType, ty.typeParameters, this);
			return parameterizedType;

		} else if (ty.isGenericType()) {
			// ======= generic types ======================
			ResolvedType rt = resolveGenericTypeFor(ty, false);
			ReferenceType genericType = (ReferenceType) rt;
			return genericType;

		} else if (ty.isGenericWildcard()) {
			// ======= generic wildcard types =============
			return resolveGenericWildcardFor((WildcardedUnresolvedType) ty);
		} else {
			// ======= simple and raw types ===============
			String erasedSignature = ty.getErasureSignature();
			ReferenceType simpleOrRawType = new ReferenceType(erasedSignature, this);
			if (ty.needsModifiableDelegate()) {
				simpleOrRawType.setNeedsModifiableDelegate(true);
			}
			ReferenceTypeDelegate delegate = resolveDelegate(simpleOrRawType);
			// 117854
			// if (delegate == null) return ResolvedType.MISSING;
			if (delegate == null) {
				return new MissingResolvedTypeWithKnownSignature(ty.getSignature(), erasedSignature, this);// ResolvedType
				// .
				// MISSING
				// ;
			}

			if (delegate.isGeneric() && behaveInJava5Way) {
				// ======== raw type ===========
				simpleOrRawType.typeKind = TypeKind.RAW;
				ReferenceType genericType = makeGenericTypeFrom(delegate, simpleOrRawType);
				// name =
				// ReferenceType.fromTypeX(UnresolvedType.forRawTypeNames(
				// ty.getName()),this);
				simpleOrRawType.setDelegate(delegate);
				genericType.setDelegate(delegate);
				simpleOrRawType.setGenericType(genericType);
				return simpleOrRawType;

			} else {
				// ======== simple type =========
				simpleOrRawType.setDelegate(delegate);
				return simpleOrRawType;
			}
		}
	}

	/**
	 * Attempt to resolve a type that should be a generic type.
	 */
	public ResolvedType resolveGenericTypeFor(UnresolvedType anUnresolvedType, boolean allowMissing) {
		// Look up the raw type by signature
		String rawSignature = anUnresolvedType.getRawType().getSignature();
		ResolvedType rawType = typeMap.get(rawSignature);
		if (rawType == null) {
			rawType = resolve(UnresolvedType.forSignature(rawSignature), allowMissing);
			typeMap.put(rawSignature, rawType);
		}
		if (rawType.isMissing()) {
			return rawType;
		}

		// Does the raw type know its generic form? (It will if we created the
		// raw type from a source type, it won't if its been created just
		// through
		// being referenced, e.g. java.util.List
		ResolvedType genericType = rawType.getGenericType();

		// There is a special case to consider here (testGenericsBang_pr95993
		// highlights it)
		// You may have an unresolvedType for a parameterized type but it
		// is backed by a simple type rather than a generic type. This occurs
		// for
		// inner types of generic types that inherit their enclosing types
		// type variables.
		if (rawType.isSimpleType() && (anUnresolvedType.typeParameters == null || anUnresolvedType.typeParameters.length == 0)) {
			rawType.world = this;
			return rawType;
		}

		if (genericType != null) {
			genericType.world = this;
			return genericType;
		} else {
			// Fault in the generic that underpins the raw type ;)
			ReferenceTypeDelegate delegate = resolveDelegate((ReferenceType) rawType);
			ReferenceType genericRefType = makeGenericTypeFrom(delegate, ((ReferenceType) rawType));
			((ReferenceType) rawType).setGenericType(genericRefType);
			genericRefType.setDelegate(delegate);
			((ReferenceType) rawType).setDelegate(delegate);
			return genericRefType;
		}
	}

	private ReferenceType makeGenericTypeFrom(ReferenceTypeDelegate delegate, ReferenceType rawType) {
		String genericSig = delegate.getDeclaredGenericSignature();
		if (genericSig != null) {
			return new ReferenceType(UnresolvedType.forGenericTypeSignature(rawType.getSignature(),
					delegate.getDeclaredGenericSignature()), this);
		} else {
			return new ReferenceType(UnresolvedType.forGenericTypeVariables(rawType.getSignature(), delegate.getTypeVariables()),
					this);
		}
	}

	/**
	 * Go from an unresolved generic wildcard (represented by UnresolvedType) to a resolved version (BoundedReferenceType).
	 */
	private ReferenceType resolveGenericWildcardFor(WildcardedUnresolvedType aType) {
		BoundedReferenceType ret = null;
		// FIXME asc doesnt take account of additional interface bounds (e.g. ?
		// super R & Serializable - can you do that?)
		if (aType.isExtends()) {
			ReferenceType upperBound = (ReferenceType) resolve(aType.getUpperBound());
			ret = new BoundedReferenceType(upperBound, true, this);
		} else if (aType.isSuper()) {
			ReferenceType lowerBound = (ReferenceType) resolve(aType.getLowerBound());
			ret = new BoundedReferenceType(lowerBound, false, this);
		} else {
			// must be ? on its own!
			ret = getWildcard();
		}
		return ret;
	}

	/**
	 * Find the ReferenceTypeDelegate behind this reference type so that it can fulfill its contract.
	 */
	protected abstract ReferenceTypeDelegate resolveDelegate(ReferenceType ty);

	/**
	 * Special resolution for "core" types like OBJECT. These are resolved just like any other type, but if they are not found it is
	 * more serious and we issue an error message immediately.
	 */
	// OPTIMIZE streamline path for core types? They are just simple types,
	// could look straight in the typemap?
	public ResolvedType getCoreType(UnresolvedType tx) {
		ResolvedType coreTy = resolve(tx, true);
		if (coreTy.isMissing()) {
			MessageUtil.error(messageHandler, WeaverMessages.format(WeaverMessages.CANT_FIND_CORE_TYPE, tx.getName()));
		}
		return coreTy;
	}

	/**
	 * Lookup a type by signature, if not found then build one and put it in the map.
	 */
	public ReferenceType lookupOrCreateName(UnresolvedType ty) {
		String signature = ty.getSignature();
		ReferenceType ret = lookupBySignature(signature);
		if (ret == null) {
			ret = ReferenceType.fromTypeX(ty, this);
			typeMap.put(signature, ret);
		}
		return ret;
	}

	/**
	 * Lookup a reference type in the world by its signature. Returns null if not found.
	 */
	public ReferenceType lookupBySignature(String signature) {
		return (ReferenceType) typeMap.get(signature);
	}

	// ==========================================================================
	// ===
	// T Y P E R E S O L U T I O N -- E N D
	// ==========================================================================
	// ===

	/**
	 * Member resolution is achieved by resolving the declaring type and then looking up the member in the resolved declaring type.
	 */
	public ResolvedMember resolve(Member member) {
		ResolvedType declaring = member.getDeclaringType().resolve(this);
		if (declaring.isRawType()) {
			declaring = declaring.getGenericType();
		}
		ResolvedMember ret;
		if (member.getKind() == Member.FIELD) {
			ret = declaring.lookupField(member);
		} else {
			ret = declaring.lookupMethod(member);
		}

		if (ret != null) {
			return ret;
		}

		return declaring.lookupSyntheticMember(member);
	}

	private boolean allLintIgnored = false;

	public void setAllLintIgnored() {
		allLintIgnored = true;
	}

	public boolean areAllLintIgnored() {
		return allLintIgnored;
	}

	public abstract IWeavingSupport getWeavingSupport();

	/**
	 * Create an advice shadow munger from the given advice attribute
	 */
	// public abstract Advice createAdviceMunger(AjAttribute.AdviceAttribute
	// attribute, Pointcut pointcut, Member signature);
	/**
	 * Create an advice shadow munger for the given advice kind
	 */
	public final Advice createAdviceMunger(AdviceKind kind, Pointcut p, Member signature, int extraParameterFlags,
			IHasSourceLocation loc, ResolvedType declaringAspect) {
		AjAttribute.AdviceAttribute attribute = new AjAttribute.AdviceAttribute(kind, p, extraParameterFlags, loc.getStart(),
				loc.getEnd(), loc.getSourceContext());
		return getWeavingSupport().createAdviceMunger(attribute, p, signature, declaringAspect);
	}

	/**
	 * Same signature as org.aspectj.util.PartialOrder.PartialComparable.compareTo
	 */
	public int compareByPrecedence(ResolvedType aspect1, ResolvedType aspect2) {
		return precedenceCalculator.compareByPrecedence(aspect1, aspect2);
	}

	public Integer getPrecedenceIfAny(ResolvedType aspect1, ResolvedType aspect2) {
		return precedenceCalculator.getPrecedenceIfAny(aspect1, aspect2);
	}

	/**
	 * compares by precedence with the additional rule that a super-aspect is sorted before its sub-aspects
	 */
	public int compareByPrecedenceAndHierarchy(ResolvedType aspect1, ResolvedType aspect2) {
		return precedenceCalculator.compareByPrecedenceAndHierarchy(aspect1, aspect2);
	}

	// simple property getter and setters
	// ===========================================================

	/**
	 * Nobody should hold onto a copy of this message handler, or setMessageHandler won't work right.
	 */
	public IMessageHandler getMessageHandler() {
		return messageHandler;
	}

	public void setMessageHandler(IMessageHandler messageHandler) {
		if (this.isInPinpointMode()) {
			this.messageHandler = new PinpointingMessageHandler(messageHandler);
		} else {
			this.messageHandler = messageHandler;
		}
	}

	/**
	 * convenenience method for creating and issuing messages via the message handler - if you supply two locations you will get two
	 * messages.
	 */
	public void showMessage(Kind kind, String message, ISourceLocation loc1, ISourceLocation loc2) {
		if (loc1 != null) {
			messageHandler.handleMessage(new Message(message, kind, null, loc1));
			if (loc2 != null) {
				messageHandler.handleMessage(new Message(message, kind, null, loc2));
			}
		} else {
			messageHandler.handleMessage(new Message(message, kind, null, loc2));
		}
	}

	public void setCrossReferenceHandler(ICrossReferenceHandler xrefHandler) {
		this.xrefHandler = xrefHandler;
	}

	/**
	 * Get the cross-reference handler for the world, may be null.
	 */
	public ICrossReferenceHandler getCrossReferenceHandler() {
		return xrefHandler;
	}

	public void setTypeVariableLookupScope(TypeVariableDeclaringElement scope) {
		typeVariableLookupScope = scope;
	}

	public TypeVariableDeclaringElement getTypeVariableLookupScope() {
		return typeVariableLookupScope;
	}

	public List<DeclareParents> getDeclareParents() {
		return crosscuttingMembersSet.getDeclareParents();
	}

	public List<DeclareAnnotation> getDeclareAnnotationOnTypes() {
		return crosscuttingMembersSet.getDeclareAnnotationOnTypes();
	}

	public List<DeclareAnnotation> getDeclareAnnotationOnFields() {
		return crosscuttingMembersSet.getDeclareAnnotationOnFields();
	}

	public List<DeclareAnnotation> getDeclareAnnotationOnMethods() {
		return crosscuttingMembersSet.getDeclareAnnotationOnMethods();
	}

	public List<DeclareTypeErrorOrWarning> getDeclareTypeEows() {
		return crosscuttingMembersSet.getDeclareTypeEows();
	}

	public List<DeclareSoft> getDeclareSoft() {
		return crosscuttingMembersSet.getDeclareSofts();
	}

	public CrosscuttingMembersSet getCrosscuttingMembersSet() {
		return crosscuttingMembersSet;
	}

	public IStructureModel getModel() {
		return model;
	}

	public void setModel(IStructureModel model) {
		this.model = model;
	}

	public Lint getLint() {
		return lint;
	}

	public void setLint(Lint lint) {
		this.lint = lint;
	}

	public boolean isXnoInline() {
		return XnoInline;
	}

	public void setXnoInline(boolean xnoInline) {
		XnoInline = xnoInline;
	}

	public boolean isXlazyTjp() {
		return XlazyTjp;
	}

	public void setXlazyTjp(boolean b) {
		XlazyTjp = b;
	}

	public boolean isHasMemberSupportEnabled() {
		return XhasMember;
	}

	public void setXHasMemberSupportEnabled(boolean b) {
		XhasMember = b;
	}

	public boolean isInPinpointMode() {
		return Xpinpoint;
	}

	public void setPinpointMode(boolean b) {
		Xpinpoint = b;
	}

	public boolean isMinimalModel() {
		ensureAdvancedConfigurationProcessed();
		return minimalModel;
	}

	public boolean isTargettingRuntime1_6_10() {
		ensureAdvancedConfigurationProcessed();
		return targettingRuntime1_6_10;
	}

	public void setBehaveInJava5Way(boolean b) {
		behaveInJava5Way = b;
	}

	/**
	 * Set the timing option (whether to collect timing info), this will also need INFO messages turned on for the message handler
	 * being used. The reportPeriodically flag should be set to false under AJDT so numbers just come out at the end.
	 */
	public void setTiming(boolean timersOn, boolean reportPeriodically) {
		timing = timersOn;
		timingPeriodically = reportPeriodically;
	}

	/**
	 * Set the error and warning threashold which can be taken from CompilerOptions (see bug 129282)
	 * 
	 * @param errorThreshold
	 * @param warningThreshold
	 */
	public void setErrorAndWarningThreshold(long errorThreshold, long warningThreshold) {
		this.errorThreshold = errorThreshold;
		this.warningThreshold = warningThreshold;
	}

	/**
	 * @return true if ignoring the UnusedDeclaredThrownException and false if this compiler option is set to error or warning
	 */
	public boolean isIgnoringUnusedDeclaredThrownException() {
		// the 0x800000 is CompilerOptions.UnusedDeclaredThrownException
		// which is ASTNode.bit24
		if ((errorThreshold & 0x800000) != 0 || (warningThreshold & 0x800000) != 0) {
			return false;
		}
		return true;
	}

	public void performExtraConfiguration(String config) {
		if (config == null) {
			return;
		}
		// Bunch of name value pairs to split
		extraConfiguration = new Properties();
		int pos = -1;
		while ((pos = config.indexOf(",")) != -1) {
			String nvpair = config.substring(0, pos);
			int pos2 = nvpair.indexOf("=");
			if (pos2 != -1) {
				String n = nvpair.substring(0, pos2);
				String v = nvpair.substring(pos2 + 1);
				extraConfiguration.setProperty(n, v);
			}
			config = config.substring(pos + 1);
		}
		if (config.length() > 0) {
			int pos2 = config.indexOf("=");
			if (pos2 != -1) {
				String n = config.substring(0, pos2);
				String v = config.substring(pos2 + 1);
				extraConfiguration.setProperty(n, v);
			}
		}
		ensureAdvancedConfigurationProcessed();
	}

	public boolean areInfoMessagesEnabled() {
		if (infoMessagesEnabled == 0) {
			infoMessagesEnabled = (messageHandler.isIgnoring(IMessage.INFO) ? 1 : 2);
		}
		return infoMessagesEnabled == 2;
	}

	/**
	 * may return null
	 */
	public Properties getExtraConfiguration() {
		return extraConfiguration;
	}

	public final static String xsetWEAVE_JAVA_PACKAGES = "weaveJavaPackages"; // default
	// false
	// -
	// controls
	// LTW
	public final static String xsetWEAVE_JAVAX_PACKAGES = "weaveJavaxPackages"; // default
	// false
	// -
	// controls
	// LTW
	public final static String xsetCAPTURE_ALL_CONTEXT = "captureAllContext"; // default
	// false
	public final static String xsetRUN_MINIMAL_MEMORY = "runMinimalMemory"; // default
	// true
	public final static String xsetDEBUG_STRUCTURAL_CHANGES_CODE = "debugStructuralChangesCode"; // default
	// false
	public final static String xsetDEBUG_BRIDGING = "debugBridging"; // default
	// false
	public final static String xsetBCEL_REPOSITORY_CACHING = "bcelRepositoryCaching";
	public final static String xsetPIPELINE_COMPILATION = "pipelineCompilation";
	public final static String xsetGENERATE_STACKMAPS = "generateStackMaps";
	public final static String xsetPIPELINE_COMPILATION_DEFAULT = "true";
	public final static String xsetCOMPLETE_BINARY_TYPES = "completeBinaryTypes";
	public final static String xsetCOMPLETE_BINARY_TYPES_DEFAULT = "false";
	public final static String xsetTYPE_DEMOTION = "typeDemotion";
	public final static String xsetTYPE_DEMOTION_DEBUG = "typeDemotionDebug";
	public final static String xsetTYPE_REFS = "useWeakTypeRefs";
	public final static String xsetBCEL_REPOSITORY_CACHING_DEFAULT = "true";
	public final static String xsetFAST_PACK_METHODS = "fastPackMethods"; // default true
	public final static String xsetOVERWEAVING = "overWeaving";
	public final static String xsetOPTIMIZED_MATCHING = "optimizedMatching";
	public final static String xsetTIMERS_PER_JOINPOINT = "timersPerJoinpoint";
	public final static String xsetTIMERS_PER_FASTMATCH_CALL = "timersPerFastMatchCall";
	public final static String xsetITD_VERSION = "itdVersion";
	public final static String xsetITD_VERSION_ORIGINAL = "1";
	public final static String xsetITD_VERSION_2NDGEN = "2";
	public final static String xsetITD_VERSION_DEFAULT = xsetITD_VERSION_2NDGEN;
	public final static String xsetMINIMAL_MODEL = "minimalModel";
	public final static String xsetTARGETING_RUNTIME_1610 = "targetRuntime1_6_10";

	public boolean isInJava5Mode() {
		return behaveInJava5Way;
	}

	public boolean isTimingEnabled() {
		return timing;
	}

	public void setTargetAspectjRuntimeLevel(String s) {
		targetAspectjRuntimeLevel = s;
	}

	public void setOptionalJoinpoints(String jps) {
		if (jps == null) {
			return;
		}
		if (jps.indexOf("arrayconstruction") != -1) {
			optionalJoinpoint_ArrayConstruction = true;
		}
		if (jps.indexOf("synchronization") != -1) {
			optionalJoinpoint_Synchronization = true;
		}
	}

	public boolean isJoinpointArrayConstructionEnabled() {
		return optionalJoinpoint_ArrayConstruction;
	}

	public boolean isJoinpointSynchronizationEnabled() {
		return optionalJoinpoint_Synchronization;
	}

	public String getTargetAspectjRuntimeLevel() {
		return targetAspectjRuntimeLevel;
	}

	// OPTIMIZE are users falling foul of not supplying -1.5 and so targetting
	// the old runtime?
	public boolean isTargettingAspectJRuntime12() {
		boolean b = false; // pr116679
		if (!isInJava5Mode()) {
			b = true;
		} else {
			b = getTargetAspectjRuntimeLevel().equals(org.aspectj.weaver.Constants.RUNTIME_LEVEL_12);
		}
		// System.err.println("Asked if targetting runtime 1.2 , returning: "+b);
		return b;
	}

	/*
	 * Map of types in the world, can have 'references' to expendable ones which can be garbage collected to recover memory. An
	 * expendable type is a reference type that is not exposed to the weaver (ie just pulled in for type resolution purposes).
	 */
	public static class TypeMap {

		// Strategy for entries in the expendable map
		public final static int DONT_USE_REFS = 0; // Hang around forever
		public final static int USE_WEAK_REFS = 1; // Collected asap
		public final static int USE_SOFT_REFS = 2; // Collected when short on memory

		public List<String> addedSinceLastDemote;
		public List<String> writtenClasses;

		private static boolean debug = false;
		public static boolean useExpendableMap = true; // configurable for reliable testing
		private boolean demotionSystemActive;
		private boolean debugDemotion = false;

		public int policy = USE_WEAK_REFS;

		// Map of types that never get thrown away
		final Map<String, ResolvedType> tMap = new HashMap<String, ResolvedType>();

		// Map of types that may be ejected from the cache if we need space
		final Map<String, Reference<ResolvedType>> expendableMap = Collections
				.synchronizedMap(new WeakHashMap<String, Reference<ResolvedType>>());

		private final World w;

		// profiling tools...
		private boolean memoryProfiling = false;
		private int maxExpendableMapSize = -1;
		private int collectedTypes = 0;
		private final ReferenceQueue<ResolvedType> rq = new ReferenceQueue<ResolvedType>();

		// private static Trace trace = TraceFactory.getTraceFactory().getTrace(World.TypeMap.class);

		TypeMap(World w) {
			// Demotion activated when switched on and loadtime weaving or in AJDT
			demotionSystemActive = w.isDemotionActive() && (w.isLoadtimeWeaving() || w.couldIncrementalCompileFollow());
			addedSinceLastDemote = new ArrayList<String>();
			writtenClasses = new ArrayList<String>();
			this.w = w;
			memoryProfiling = false;// !w.getMessageHandler().isIgnoring(Message.
			// INFO);
		}

		// For testing
		public Map<String, Reference<ResolvedType>> getExpendableMap() {
			return expendableMap;
		}

		// For testing
		public Map<String, ResolvedType> getMainMap() {
			return tMap;
		}

		public int demote() {
			return demote(false);
		}

		/**
		 * Go through any types added during the previous file weave. If any are suitable for demotion, then put them in the
		 * expendable map where GC can claim them at some point later. Demotion means: the type is not an aspect, the type is not
		 * java.lang.Object, the type is not primitive and the type is not affected by type mungers in any way. Further refinements
		 * of these conditions may allow for more demotions.
		 * 
		 * @return number of types demoted
		 */
		public int demote(boolean atEndOfCompile) {
			if (!demotionSystemActive) {
				return 0;
			}
			if (debugDemotion) {
				System.out.println("Demotion running " + addedSinceLastDemote);
			}
			boolean isLtw = w.isLoadtimeWeaving();
			int demotionCounter = 0;
			if (isLtw) {
				// Loadtime weaving demotion strategy
				for (String key : addedSinceLastDemote) {
					ResolvedType type = tMap.get(key);
					if (type != null && !type.isAspect() && !type.equals(UnresolvedType.OBJECT) && !type.isPrimitiveType()) {
						List<ConcreteTypeMunger> typeMungers = type.getInterTypeMungers();
						if (typeMungers == null || typeMungers.size() == 0) {
							tMap.remove(key);
							insertInExpendableMap(key, type);
							demotionCounter++;
						}
					}
				}
				addedSinceLastDemote.clear();
			} else {
				// Compile time demotion strategy
				List<String> forRemoval = new ArrayList<String>();
				for (String key : addedSinceLastDemote) {
					ResolvedType type = tMap.get(key);
					if (type == null) {
						// TODO not 100% sure why it is not there, where did it go?
						forRemoval.add(key);
						continue;
					}
					if (!writtenClasses.contains(type.getName())) { // COSTLY
						continue;
					}
					if (type != null && !type.isAspect() && !type.equals(UnresolvedType.OBJECT) && !type.isPrimitiveType()) {
						List<ConcreteTypeMunger> typeMungers = type.getInterTypeMungers();
						if (typeMungers == null || typeMungers.size() == 0) {
							/*
							 * if (type.isNested()) { try { ReferenceType rt = (ReferenceType) w.resolve(type.getOutermostType());
							 * if (!rt.isMissing()) { ReferenceTypeDelegate delegate = ((ReferenceType) type).getDelegate(); boolean
							 * isWeavable = delegate == null ? false : delegate.isExposedToWeaver(); boolean hasBeenWoven = delegate
							 * == null ? false : delegate.hasBeenWoven(); if (isWeavable && !hasBeenWoven) { // skip demotion of
							 * this inner type for now continue; } } } catch (ClassCastException cce) { cce.printStackTrace();
							 * System.out.println("outer of " + key + " is not a reftype? " + type.getOutermostType()); // throw new
							 * IllegalStateException(cce); } }
							 */
							ReferenceTypeDelegate delegate = ((ReferenceType) type).getDelegate();
							boolean isWeavable = delegate == null ? false : delegate.isExposedToWeaver();
							boolean hasBeenWoven = delegate == null ? false : delegate.hasBeenWoven();
							if (!isWeavable || hasBeenWoven) {
								if (debugDemotion) {
									System.out.println("Demoting " + key);
								}
								forRemoval.add(key);
								tMap.remove(key);
								insertInExpendableMap(key, type);
								demotionCounter++;
							}
						} else {
							// no need to try this again, it will never be demoted
							writtenClasses.remove(type.getName());
							forRemoval.add(key);
						}
					} else {
						writtenClasses.remove(type.getName());
						// no need to try this again, it will never be demoted
						forRemoval.add(key);
					}
				}
				addedSinceLastDemote.removeAll(forRemoval);
			}
			if (debugDemotion) {
				System.out.println("Demoted " + demotionCounter + " types.  Types remaining in fixed set #" + tMap.keySet().size()
						+ ".  addedSinceLastDemote size is " + addedSinceLastDemote.size());
				System.out.println("writtenClasses.size() = " + writtenClasses.size() + ": " + writtenClasses);
			}
			if (atEndOfCompile) {
				if (debugDemotion) {
					System.out.println("Clearing writtenClasses");
				}
				writtenClasses.clear();
			}
			return demotionCounter;
		}

		private void insertInExpendableMap(String key, ResolvedType type) {
			if (useExpendableMap) {
				if (!expendableMap.containsKey(key)) {
					if (policy == USE_SOFT_REFS) {
						expendableMap.put(key, new SoftReference<ResolvedType>(type));
					} else {
						expendableMap.put(key, new WeakReference<ResolvedType>(type));
					}
				}
			}
		}

		/**
		 * Add a new type into the map, the key is the type signature. Some types do *not* go in the map, these are ones involving
		 * *member* type variables. The reason is that when all you have is the signature which gives you a type variable name, you
		 * cannot guarantee you are using the type variable in the same way as someone previously working with a similarly named
		 * type variable. So, these do not go into the map: - TypeVariableReferenceType. - ParameterizedType where a member type
		 * variable is involved. - BoundedReferenceType when one of the bounds is a type variable.
		 * 
		 * definition: "member type variables" - a tvar declared on a generic method/ctor as opposed to those you see declared on a
		 * generic type.
		 */
		public ResolvedType put(String key, ResolvedType type) {
			if (!type.isCacheable()) {
				return type;
			}
			if (type.isParameterizedType() && type.isParameterizedWithTypeVariable()) {
				if (debug) {
					System.err
							.println("Not putting a parameterized type that utilises member declared type variables into the typemap: key="
									+ key + " type=" + type);
				}
				return type;
			}
			if (type.isTypeVariableReference()) {
				if (debug) {
					System.err.println("Not putting a type variable reference type into the typemap: key=" + key + " type=" + type);
				}
				return type;
			}
			// this test should be improved - only avoid putting them in if one
			// of the
			// bounds is a member type variable
			if (type instanceof BoundedReferenceType) {
				if (debug) {
					System.err.println("Not putting a bounded reference type into the typemap: key=" + key + " type=" + type);
				}
				return type;
			}
			if (type instanceof MissingResolvedTypeWithKnownSignature) {
				if (debug) {
					System.err.println("Not putting a missing type into the typemap: key=" + key + " type=" + type);
				}
				return type;
			}

			if ((type instanceof ReferenceType) && (((ReferenceType) type).getDelegate() == null) && w.isExpendable(type)) {
				if (debug) {
					System.err.println("Not putting expendable ref type with null delegate into typemap: key=" + key + " type="
							+ type);
				}
				return type;
			}

			// TODO should this be in as a permanent assertion?
			/*
			 * if ((type instanceof ReferenceType) && type.getWorld().isInJava5Mode() && (((ReferenceType) type).getDelegate() !=
			 * null) && type.isGenericType()) { throw new BCException("Attempt to add generic type to typemap " + type.toString() +
			 * " (should be raw)"); }
			 */

			if (w.isExpendable(type)) {
				if (useExpendableMap) {
					// Dont use reference queue for tracking if not profiling...
					if (policy == USE_WEAK_REFS) {
						if (memoryProfiling) {
							expendableMap.put(key, new WeakReference<ResolvedType>(type, rq));
						} else {
							expendableMap.put(key, new WeakReference<ResolvedType>(type));
						}
					} else if (policy == USE_SOFT_REFS) {
						if (memoryProfiling) {
							expendableMap.put(key, new SoftReference<ResolvedType>(type, rq));
						} else {
							expendableMap.put(key, new SoftReference<ResolvedType>(type));
						}
						// } else {
						// expendableMap.put(key, type);
					}
				}
				if (memoryProfiling && expendableMap.size() > maxExpendableMapSize) {
					maxExpendableMapSize = expendableMap.size();
				}
				return type;
			} else {

				if (demotionSystemActive) {
					// System.out.println("Added since last demote " + key);
					addedSinceLastDemote.add(key);
				}

				return tMap.put(key, type);
			}
		}

		public void report() {
			if (!memoryProfiling) {
				return;
			}
			checkq();
			w.getMessageHandler().handleMessage(
					MessageUtil.info("MEMORY: world expendable type map reached maximum size of #" + maxExpendableMapSize
							+ " entries"));
			w.getMessageHandler().handleMessage(
					MessageUtil.info("MEMORY: types collected through garbage collection #" + collectedTypes + " entries"));
		}

		public void checkq() {
			if (!memoryProfiling) {
				return;
			}
			while (rq.poll() != null) {
				collectedTypes++;
			}
		}

		/**
		 * Lookup a type by its signature, always look in the real map before the expendable map
		 */
		public ResolvedType get(String key) {
			checkq();
			ResolvedType ret = tMap.get(key);
			if (ret == null) {
				if (policy == USE_WEAK_REFS) {
					WeakReference<ResolvedType> ref = (WeakReference<ResolvedType>) expendableMap.get(key);
					if (ref != null) {
						ret = ref.get();
					}
				} else if (policy == USE_SOFT_REFS) {
					SoftReference<ResolvedType> ref = (SoftReference<ResolvedType>) expendableMap.get(key);
					if (ref != null) {
						ret = ref.get();
					}
					// } else {
					// return (ResolvedType) expendableMap.get(key);
				}
			}
			return ret;
		}

		/** Remove a type from the map */
		public ResolvedType remove(String key) {
			ResolvedType ret = tMap.remove(key);
			if (ret == null) {
				if (policy == USE_WEAK_REFS) {
					WeakReference<ResolvedType> wref = (WeakReference<ResolvedType>) expendableMap.remove(key);
					if (wref != null) {
						ret = wref.get();
					}
				} else if (policy == USE_SOFT_REFS) {
					SoftReference<ResolvedType> wref = (SoftReference<ResolvedType>) expendableMap.remove(key);
					if (wref != null) {
						ret = wref.get();
					}
					// } else {
					// ret = (ResolvedType) expendableMap.remove(key);
				}
			}
			return ret;
		}

		public void classWriteEvent(String classname) {
			// that is a name com.Foo and not a signature Lcom/Foo; boooooooooo!
			if (demotionSystemActive) {
				writtenClasses.add(classname);
			}
			if (debugDemotion) {
				System.out.println("Class write event for " + classname);
			}
		}

		// public ResolvedType[] getAllTypes() {
		// List/* ResolvedType */results = new ArrayList();
		//
		// collectTypes(expendableMap, results);
		// collectTypes(tMap, results);
		// return (ResolvedType[]) results.toArray(new
		// ResolvedType[results.size()]);
		// }
		//
		// private void collectTypes(Map map, List/* ResolvedType */results) {
		// for (Iterator iterator = map.keySet().iterator();
		// iterator.hasNext();) {
		// String key = (String) iterator.next();
		// ResolvedType type = get(key);
		// if (type != null)
		// results.add(type);
		// else
		// System.err.println("null!:" + key);
		// }
		// }

	}

	/**
	 * This class is used to compute and store precedence relationships between aspects.
	 */
	private static class AspectPrecedenceCalculator {

		private final World world;
		private final Map<PrecedenceCacheKey, Integer> cachedResults;

		public AspectPrecedenceCalculator(World forSomeWorld) {
			world = forSomeWorld;
			cachedResults = new HashMap<PrecedenceCacheKey, Integer>();
		}

		/**
		 * Ask every declare precedence in the world to order the two aspects. If more than one declare precedence gives an
		 * ordering, and the orderings conflict, then that's an error.
		 */
		public int compareByPrecedence(ResolvedType firstAspect, ResolvedType secondAspect) {
			PrecedenceCacheKey key = new PrecedenceCacheKey(firstAspect, secondAspect);
			if (cachedResults.containsKey(key)) {
				return (cachedResults.get(key)).intValue();
			} else {
				int order = 0;
				DeclarePrecedence orderer = null; // Records the declare
				// precedence statement that
				// gives the first ordering
				for (Iterator<Declare> i = world.getCrosscuttingMembersSet().getDeclareDominates().iterator(); i.hasNext();) {
					DeclarePrecedence d = (DeclarePrecedence) i.next();
					int thisOrder = d.compare(firstAspect, secondAspect);
					if (thisOrder != 0) {
						if (orderer == null) {
							orderer = d;
						}
						if (order != 0 && order != thisOrder) {
							ISourceLocation[] isls = new ISourceLocation[2];
							isls[0] = orderer.getSourceLocation();
							isls[1] = d.getSourceLocation();
							Message m = new Message("conflicting declare precedence orderings for aspects: "
									+ firstAspect.getName() + " and " + secondAspect.getName(), null, true, isls);
							world.getMessageHandler().handleMessage(m);
						} else {
							order = thisOrder;
						}
					}
				}
				cachedResults.put(key, new Integer(order));
				return order;
			}
		}

		public Integer getPrecedenceIfAny(ResolvedType aspect1, ResolvedType aspect2) {
			return cachedResults.get(new PrecedenceCacheKey(aspect1, aspect2));
		}

		public int compareByPrecedenceAndHierarchy(ResolvedType firstAspect, ResolvedType secondAspect) {
			if (firstAspect.equals(secondAspect)) {
				return 0;
			}

			int ret = compareByPrecedence(firstAspect, secondAspect);
			if (ret != 0) {
				return ret;
			}

			if (firstAspect.isAssignableFrom(secondAspect)) {
				return -1;
			} else if (secondAspect.isAssignableFrom(firstAspect)) {
				return +1;
			}

			return 0;
		}

		private static class PrecedenceCacheKey {
			public ResolvedType aspect1;
			public ResolvedType aspect2;

			public PrecedenceCacheKey(ResolvedType a1, ResolvedType a2) {
				aspect1 = a1;
				aspect2 = a2;
			}

			@Override
			public boolean equals(Object obj) {
				if (!(obj instanceof PrecedenceCacheKey)) {
					return false;
				}
				PrecedenceCacheKey other = (PrecedenceCacheKey) obj;
				return (aspect1 == other.aspect1 && aspect2 == other.aspect2);
			}

			@Override
			public int hashCode() {
				return aspect1.hashCode() + aspect2.hashCode();
			}
		}
	}

	public void validateType(UnresolvedType type) {
	}

	// --- with java5 we can get into a recursive mess if we aren't careful when
	// resolving types (*cough* java.lang.Enum) ---

	public boolean isDemotionActive() {
		return false;
	}

	// --- this first map is for java15 delegates which may try and recursively
	// access the same type variables.
	// --- I would rather stash this against a reference type - but we don't
	// guarantee referencetypes are unique for
	// so we can't :(
	private final Map<Class<?>, TypeVariable[]> workInProgress1 = new HashMap<Class<?>, TypeVariable[]>();

	public TypeVariable[] getTypeVariablesCurrentlyBeingProcessed(Class<?> baseClass) {
		return workInProgress1.get(baseClass);
	}

	public void recordTypeVariablesCurrentlyBeingProcessed(Class<?> baseClass, TypeVariable[] typeVariables) {
		workInProgress1.put(baseClass, typeVariables);
	}

	public void forgetTypeVariablesCurrentlyBeingProcessed(Class<?> baseClass) {
		workInProgress1.remove(baseClass);
	}

	public void setAddSerialVerUID(boolean b) {
		addSerialVerUID = b;
	}

	public boolean isAddSerialVerUID() {
		return addSerialVerUID;
	}

	/** be careful calling this - pr152257 */
	public void flush() {
		typeMap.expendableMap.clear();
	}

	public void ensureAdvancedConfigurationProcessed() {

		// Check *once* whether the user has switched asm support off
		if (!checkedAdvancedConfiguration) {
			Properties p = getExtraConfiguration();
			if (p != null) {

				String s = p.getProperty(xsetBCEL_REPOSITORY_CACHING, xsetBCEL_REPOSITORY_CACHING_DEFAULT);
				bcelRepositoryCaching = s.equalsIgnoreCase("true");
				if (!bcelRepositoryCaching) {
					getMessageHandler().handleMessage(
							MessageUtil
									.info("[bcelRepositoryCaching=false] AspectJ will not use a bcel cache for class information"));
				}

				// ITD Versions
				// 1 is the first version in use up to AspectJ 1.6.8
				// 2 is from 1.6.9 onwards
				s = p.getProperty(xsetITD_VERSION, xsetITD_VERSION_DEFAULT);
				if (s.equals(xsetITD_VERSION_ORIGINAL)) {
					itdVersion = 1;
				}

				s = p.getProperty(xsetMINIMAL_MODEL, "false");
				if (s.equalsIgnoreCase("true")) {
					minimalModel = true;
				}

				s = p.getProperty(xsetTARGETING_RUNTIME_1610, "false");
				if (s.equalsIgnoreCase("true")) {
					targettingRuntime1_6_10 = true;
				}

				s = p.getProperty(xsetFAST_PACK_METHODS, "true");
				fastMethodPacking = s.equalsIgnoreCase("true");

				s = p.getProperty(xsetPIPELINE_COMPILATION, xsetPIPELINE_COMPILATION_DEFAULT);
				shouldPipelineCompilation = s.equalsIgnoreCase("true");

				s = p.getProperty(xsetGENERATE_STACKMAPS, "false");
				shouldGenerateStackMaps = s.equalsIgnoreCase("true");

				s = p.getProperty(xsetCOMPLETE_BINARY_TYPES, xsetCOMPLETE_BINARY_TYPES_DEFAULT);
				completeBinaryTypes = s.equalsIgnoreCase("true");
				if (completeBinaryTypes) {
					getMessageHandler().handleMessage(
							MessageUtil.info("[completeBinaryTypes=true] Completion of binary types activated"));
				}

				s = p.getProperty(xsetTYPE_DEMOTION); // default is: ON (for ltw) OFF (for ctw)
				if (s != null) {
					boolean b = typeMap.demotionSystemActive;
					if (b && s.equalsIgnoreCase("false")) {
						System.out.println("typeDemotion=false: type demotion switched OFF");
						typeMap.demotionSystemActive = false;
					} else if (!b && s.equalsIgnoreCase("true")) {
						System.out.println("typeDemotion=true: type demotion switched ON");
						typeMap.demotionSystemActive = true;
					}
				}

				s = p.getProperty(xsetOVERWEAVING, "false");
				if (s.equalsIgnoreCase("true")) {
					overWeaving = true;
				}

				s = p.getProperty(xsetTYPE_DEMOTION_DEBUG, "false");
				if (s.equalsIgnoreCase("true")) {
					typeMap.debugDemotion = true;
				}
				s = p.getProperty(xsetTYPE_REFS, "true");
				if (s.equalsIgnoreCase("false")) {
					typeMap.policy = TypeMap.USE_SOFT_REFS;
				}

				runMinimalMemorySet = p.getProperty(xsetRUN_MINIMAL_MEMORY) != null;
				s = p.getProperty(xsetRUN_MINIMAL_MEMORY, "false");
				runMinimalMemory = s.equalsIgnoreCase("true");
				// if (runMinimalMemory)
				// getMessageHandler().handleMessage(MessageUtil.info(
				// "[runMinimalMemory=true] Optimizing bcel processing (and cost of performance) to use less memory"
				// ));

				s = p.getProperty(xsetDEBUG_STRUCTURAL_CHANGES_CODE, "false");
				forDEBUG_structuralChangesCode = s.equalsIgnoreCase("true");

				s = p.getProperty(xsetDEBUG_BRIDGING, "false");
				forDEBUG_bridgingCode = s.equalsIgnoreCase("true");

				s = p.getProperty(xsetOPTIMIZED_MATCHING, "true");
				optimizedMatching = s.equalsIgnoreCase("true");
				if (!optimizedMatching) {
					getMessageHandler().handleMessage(MessageUtil.info("[optimizedMatching=false] optimized matching turned off"));
				}

				s = p.getProperty(xsetTIMERS_PER_JOINPOINT, "25000");
				try {
					timersPerJoinpoint = Integer.parseInt(s);
				} catch (Exception e) {
					getMessageHandler().handleMessage(MessageUtil.error("unable to process timersPerJoinpoint value of " + s));
					timersPerJoinpoint = 25000;
				}

				s = p.getProperty(xsetTIMERS_PER_FASTMATCH_CALL, "250");
				try {
					timersPerType = Integer.parseInt(s);
				} catch (Exception e) {
					getMessageHandler().handleMessage(MessageUtil.error("unable to process timersPerType value of " + s));
					timersPerType = 250;
				}

			}
			try {
				String value = System.getProperty("aspectj.overweaving", "false");
				if (value.equalsIgnoreCase("true")) {
					System.out.println("ASPECTJ: aspectj.overweaving=true: overweaving switched ON");
					overWeaving = true;
				}
				value = System.getProperty("aspectj.typeDemotion", "false");
				if (value.equalsIgnoreCase("true")) {
					System.out.println("ASPECTJ: aspectj.typeDemotion=true: type demotion switched ON");
					typeMap.demotionSystemActive = true;
				}
				value = System.getProperty("aspectj.minimalModel", "false");
				if (value.equalsIgnoreCase("true")) {
					System.out.println("ASPECTJ: aspectj.minimalModel=true: minimal model switched ON");
					minimalModel = true;
				}
			} catch (Throwable t) {
				System.err.println("ASPECTJ: Unable to read system properties");
				t.printStackTrace();
			}
			checkedAdvancedConfiguration = true;
		}
	}

	public boolean isRunMinimalMemory() {
		ensureAdvancedConfigurationProcessed();
		return runMinimalMemory;
	}

	public boolean isRunMinimalMemorySet() {
		ensureAdvancedConfigurationProcessed();
		return runMinimalMemorySet;
	}

	public boolean shouldFastPackMethods() {
		ensureAdvancedConfigurationProcessed();
		return fastMethodPacking;
	}

	public boolean shouldPipelineCompilation() {
		ensureAdvancedConfigurationProcessed();
		return shouldPipelineCompilation;
	}

	public boolean shouldGenerateStackMaps() {
		ensureAdvancedConfigurationProcessed();
		return shouldGenerateStackMaps;
	}

	public void setIncrementalCompileCouldFollow(boolean b) {
		incrementalCompileCouldFollow = b;
	}

	public boolean couldIncrementalCompileFollow() {
		return incrementalCompileCouldFollow;
	}

	public void setSynchronizationPointcutsInUse() {
		if (trace.isTraceEnabled()) {
			trace.enter("setSynchronizationPointcutsInUse", this);
		}
		synchronizationPointcutsInUse = true;
		if (trace.isTraceEnabled()) {
			trace.exit("setSynchronizationPointcutsInUse");
		}
	}

	public boolean areSynchronizationPointcutsInUse() {
		return synchronizationPointcutsInUse;
	}

	/**
	 * Register a new pointcut designator handler with the world - this can be used by any pointcut parsers attached to the world.
	 * 
	 * @param designatorHandler handler for the new pointcut
	 */
	public void registerPointcutHandler(PointcutDesignatorHandler designatorHandler) {
		if (pointcutDesignators == null) {
			pointcutDesignators = new HashSet<PointcutDesignatorHandler>();
		}
		pointcutDesignators.add(designatorHandler);
	}

	public Set<PointcutDesignatorHandler> getRegisteredPointcutHandlers() {
		if (pointcutDesignators == null) {
			return Collections.emptySet();
		}
		return pointcutDesignators;
	}

	public void reportMatch(ShadowMunger munger, Shadow shadow) {

	}

	public boolean isOverWeaving() {
		return overWeaving;
	}

	public void reportCheckerMatch(Checker checker, Shadow shadow) {
	}

	/**
	 * @return true if this world has the activation and scope of application of the aspects controlled via aop.xml files
	 */
	public boolean isXmlConfigured() {
		return false;
	}

	public boolean isAspectIncluded(ResolvedType aspectType) {
		return true;
	}

	/**
	 * Determine if the named aspect requires a particular type around in order to be useful. The type is named in the aop.xml file
	 * against the aspect.
	 * 
	 * @return true if there is a type missing that this aspect really needed around
	 */
	public boolean hasUnsatisfiedDependency(ResolvedType aspectType) {
		return false;
	}

	public TypePattern getAspectScope(ResolvedType declaringType) {
		return null;
	}

	public Map<String, ResolvedType> getFixed() {
		return typeMap.tMap;
	}

	public Map<String, Reference<ResolvedType>> getExpendable() {
		return typeMap.expendableMap;
	}

	/**
	 * Ask the type map to demote any types it can - we don't want them anchored forever.
	 */
	public void demote() {
		typeMap.demote();
	}

	// protected boolean isExpendable(ResolvedType type) {
	// if (type.equals(UnresolvedType.OBJECT))
	// return false;
	// if (type == null)
	// return false;
	// boolean isExposed = type.isExposedToWeaver();
	// boolean nullDele = (type instanceof ReferenceType) ? ((ReferenceType) type).getDelegate() != null : true;
	// if (isExposed || !isExposed && nullDele)
	// return false;
	// return !type.isPrimitiveType();
	// }

	/**
	 * Reference types we don't intend to weave may be ejected from the cache if we need the space.
	 */
	protected boolean isExpendable(ResolvedType type) {
		return (!type.equals(UnresolvedType.OBJECT) && (!type.isExposedToWeaver()) && (!type.isPrimitiveType()));
	}

	// map from aspect > excluded types
	// memory issue here?
	private Map<ResolvedType, Set<ResolvedType>> exclusionMap = new HashMap<ResolvedType, Set<ResolvedType>>();

	public Map<ResolvedType, Set<ResolvedType>> getExclusionMap() {
		return exclusionMap;
	}

	private TimeCollector timeCollector = null;

	/**
	 * Record the time spent matching a pointcut - this will accumulate over the lifetime of this world/weaver and be reported every
	 * 25000 join points.
	 */
	public void record(Pointcut pointcut, long timetaken) {
		if (timeCollector == null) {
			ensureAdvancedConfigurationProcessed();
			timeCollector = new TimeCollector(this);
		}
		timeCollector.record(pointcut, timetaken);
	}

	/**
	 * Record the time spent fastmatching a pointcut - this will accumulate over the lifetime of this world/weaver and be reported
	 * every 250 types.
	 */
	public void recordFastMatch(Pointcut pointcut, long timetaken) {
		if (timeCollector == null) {
			ensureAdvancedConfigurationProcessed();
			timeCollector = new TimeCollector(this);
		}
		timeCollector.recordFastMatch(pointcut, timetaken);
	}

	public void reportTimers() {
		if (timeCollector != null && !timingPeriodically) {
			timeCollector.report();
			timeCollector = new TimeCollector(this);
		}
	}

	private static class TimeCollector {
		private World world;
		long joinpointCount;
		long typeCount;
		long perJoinpointCount;
		long perTypes;
		Map<String, Long> joinpointsPerPointcut = new HashMap<String, Long>();
		Map<String, Long> timePerPointcut = new HashMap<String, Long>();
		Map<String, Long> fastMatchTimesPerPointcut = new HashMap<String, Long>();
		Map<String, Long> fastMatchTypesPerPointcut = new HashMap<String, Long>();

		TimeCollector(World world) {
			this.perJoinpointCount = world.timersPerJoinpoint;
			this.perTypes = world.timersPerType;
			this.world = world;
			this.joinpointCount = 0;
			this.typeCount = 0;
			this.joinpointsPerPointcut = new HashMap<String, Long>();
			this.timePerPointcut = new HashMap<String, Long>();
		}

		public void report() {
			long totalTime = 0L;
			for (String p : joinpointsPerPointcut.keySet()) {
				totalTime += timePerPointcut.get(p);
			}
			world.getMessageHandler().handleMessage(
					MessageUtil.info("Pointcut matching cost (total=" + (totalTime / 1000000) + "ms for " + joinpointCount
							+ " joinpoint match calls):"));
			for (String p : joinpointsPerPointcut.keySet()) {
				StringBuffer sb = new StringBuffer();
				sb.append("Time:" + (timePerPointcut.get(p) / 1000000) + "ms (jps:#" + joinpointsPerPointcut.get(p)
						+ ") matching against " + p);
				world.getMessageHandler().handleMessage(MessageUtil.info(sb.toString()));
			}
			world.getMessageHandler().handleMessage(MessageUtil.info("---"));

			totalTime = 0L;
			for (String p : fastMatchTimesPerPointcut.keySet()) {
				totalTime += fastMatchTimesPerPointcut.get(p);
			}
			world.getMessageHandler().handleMessage(
					MessageUtil.info("Pointcut fast matching cost (total=" + (totalTime / 1000000) + "ms for " + typeCount
							+ " fast match calls):"));
			for (String p : fastMatchTimesPerPointcut.keySet()) {
				StringBuffer sb = new StringBuffer();
				sb.append("Time:" + (fastMatchTimesPerPointcut.get(p) / 1000000) + "ms (types:#" + fastMatchTypesPerPointcut.get(p)
						+ ") fast matching against " + p);
				world.getMessageHandler().handleMessage(MessageUtil.info(sb.toString()));
			}
			world.getMessageHandler().handleMessage(MessageUtil.info("---"));

		}

		void record(Pointcut pointcut, long timetakenInNs) {
			joinpointCount++;
			String pointcutText = pointcut.toString();
			Long jpcounter = joinpointsPerPointcut.get(pointcutText);
			if (jpcounter == null) {
				jpcounter = 1L;
			} else {
				jpcounter++;
			}
			joinpointsPerPointcut.put(pointcutText, jpcounter);

			Long time = timePerPointcut.get(pointcutText);
			if (time == null) {
				time = timetakenInNs;
			} else {
				time += timetakenInNs;
			}
			timePerPointcut.put(pointcutText, time);
			if (world.timingPeriodically) {
				if ((joinpointCount % perJoinpointCount) == 0) {
					long totalTime = 0L;
					for (String p : joinpointsPerPointcut.keySet()) {
						totalTime += timePerPointcut.get(p);
					}
					world.getMessageHandler().handleMessage(
							MessageUtil.info("Pointcut matching cost (total=" + (totalTime / 1000000) + "ms for " + joinpointCount
									+ " joinpoint match calls):"));
					for (String p : joinpointsPerPointcut.keySet()) {
						StringBuffer sb = new StringBuffer();
						sb.append("Time:" + (timePerPointcut.get(p) / 1000000) + "ms (jps:#" + joinpointsPerPointcut.get(p)
								+ ") matching against " + p);
						world.getMessageHandler().handleMessage(MessageUtil.info(sb.toString()));
					}
					world.getMessageHandler().handleMessage(MessageUtil.info("---"));
				}
			}
		}

		void recordFastMatch(Pointcut pointcut, long timetakenInNs) {
			typeCount++;
			String pointcutText = pointcut.toString();
			Long typecounter = fastMatchTypesPerPointcut.get(pointcutText);
			if (typecounter == null) {
				typecounter = 1L;
			} else {
				typecounter++;
			}
			fastMatchTypesPerPointcut.put(pointcutText, typecounter);

			Long time = fastMatchTimesPerPointcut.get(pointcutText);
			if (time == null) {
				time = timetakenInNs;
			} else {
				time += timetakenInNs;
			}
			fastMatchTimesPerPointcut.put(pointcutText, time);
			if (world.timingPeriodically) {
				if ((typeCount % perTypes) == 0) {
					long totalTime = 0L;
					for (String p : fastMatchTimesPerPointcut.keySet()) {
						totalTime += fastMatchTimesPerPointcut.get(p);
					}
					world.getMessageHandler().handleMessage(
							MessageUtil.info("Pointcut fast matching cost (total=" + (totalTime / 1000000) + "ms for " + typeCount
									+ " fast match calls):"));
					for (String p : fastMatchTimesPerPointcut.keySet()) {
						StringBuffer sb = new StringBuffer();
						sb.append("Time:" + (fastMatchTimesPerPointcut.get(p) / 1000000) + "ms (types:#"
								+ fastMatchTypesPerPointcut.get(p) + ") fast matching against " + p);
						world.getMessageHandler().handleMessage(MessageUtil.info(sb.toString()));
					}
					world.getMessageHandler().handleMessage(MessageUtil.info("---"));
				}
			}
		}
	}

	public TypeMap getTypeMap() {
		return typeMap;
	}

	public static void reset() {
		ResolvedType.resetPrimitives();
	}

	/**
	 * Returns the version of ITD that this world wants to create. The default is the new style (2) but in some cases where there
	 * might be a clash, the old style can be used. It is set through the option -Xset:itdVersion=1
	 * 
	 * @return the ITD version this world wants to create - 1=oldstyle 2=new, transparent style
	 */
	public int getItdVersion() {
		return itdVersion;
	}

	// if not loadtime weaving then we are compile time weaving or post-compile time weaving
	public abstract boolean isLoadtimeWeaving();

	public void classWriteEvent(char[][] compoundName) {
		// override if interested in write events
	}

}