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The AspectJ weaver introduces advices to java classes
/* *******************************************************************
* Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
* 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
* ******************************************************************/
package org.aspectj.weaver;
import java.util.Collections;
import java.util.List;
import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.weaver.patterns.AndPointcut;
import org.aspectj.weaver.patterns.PerClause;
import org.aspectj.weaver.patterns.Pointcut;
import org.aspectj.weaver.patterns.TypePattern;
public abstract class Advice extends ShadowMunger {
protected AjAttribute.AdviceAttribute attribute;
protected transient AdviceKind kind; // alias for attribute.getKind()
protected Member signature;
private boolean isAnnotationStyle;
// not necessarily declaring aspect, this is a semantics change from 1.0
protected ResolvedType concreteAspect; // null until after concretize
// Just for Cflow*entry kinds
protected List innerCflowEntries = Collections.emptyList();
protected int nFreeVars;
protected TypePattern exceptionType; // just for Softener kind
// if we are parameterized, these type may be different to the advice
// signature types
protected UnresolvedType[] bindingParameterTypes;
protected boolean hasMatchedAtLeastOnce = false;
// based on annotations on this advice
protected List suppressedLintKinds = null;
public ISourceLocation lastReportedMonitorExitJoinpointLocation = null;
public static Advice makeCflowEntry(World world, Pointcut entry, boolean isBelow, Member stackField, int nFreeVars,
List innerCflowEntries, ResolvedType inAspect) {
Advice ret = world.createAdviceMunger(isBelow ? AdviceKind.CflowBelowEntry : AdviceKind.CflowEntry, entry, stackField, 0,
entry, inAspect);
ret.innerCflowEntries = innerCflowEntries;
ret.nFreeVars = nFreeVars;
ret.setDeclaringType(inAspect); // correct?
return ret;
}
public static Advice makePerCflowEntry(World world, Pointcut entry, boolean isBelow, Member stackField, ResolvedType inAspect,
List innerCflowEntries) {
Advice ret = world.createAdviceMunger(isBelow ? AdviceKind.PerCflowBelowEntry : AdviceKind.PerCflowEntry, entry,
stackField, 0, entry, inAspect);
ret.innerCflowEntries = innerCflowEntries;
ret.concreteAspect = inAspect;
return ret;
}
public static Advice makePerObjectEntry(World world, Pointcut entry, boolean isThis, ResolvedType inAspect) {
Advice ret = world.createAdviceMunger(isThis ? AdviceKind.PerThisEntry : AdviceKind.PerTargetEntry, entry, null, 0, entry,
inAspect);
ret.concreteAspect = inAspect;
return ret;
}
// PTWIMPL per type within entry advice is what initializes the aspect
// instance in the matched type
public static Advice makePerTypeWithinEntry(World world, Pointcut p, ResolvedType inAspect) {
Advice ret = world.createAdviceMunger(AdviceKind.PerTypeWithinEntry, p, null, 0, p, inAspect);
ret.concreteAspect = inAspect;
return ret;
}
public static Advice makeSoftener(World world, Pointcut entry, TypePattern exceptionType, ResolvedType inAspect,
IHasSourceLocation loc) {
Advice ret = world.createAdviceMunger(AdviceKind.Softener, entry, null, 0, loc, inAspect);
ret.exceptionType = exceptionType;
return ret;
}
public Advice(AjAttribute.AdviceAttribute attribute, Pointcut pointcut, Member signature) {
super(pointcut, attribute.getStart(), attribute.getEnd(), attribute.getSourceContext(), ShadowMungerAdvice);
this.attribute = attribute;
this.isAnnotationStyle = signature != null && !signature.getName().startsWith("ajc$");
this.kind = attribute.getKind(); // alias
this.signature = signature;
if (signature != null) {
bindingParameterTypes = signature.getParameterTypes();
} else {
bindingParameterTypes = new UnresolvedType[0];
}
}
@Override
public boolean match(Shadow shadow, World world) {
if (super.match(shadow, world)) {
if (shadow.getKind() == Shadow.ExceptionHandler) {
if (kind.isAfter() || kind == AdviceKind.Around) {
world.showMessage(IMessage.WARNING, WeaverMessages.format(WeaverMessages.ONLY_BEFORE_ON_HANDLER),
getSourceLocation(), shadow.getSourceLocation());
return false;
}
}
if (shadow.getKind() == Shadow.SynchronizationLock || shadow.getKind() == Shadow.SynchronizationUnlock) {
if (kind == AdviceKind.Around
// Don't work, see comments in SynchronizationTests
// && attribute.getProceedCallSignatures()!=null
// && attribute.getProceedCallSignatures().length!=0
) {
world.showMessage(IMessage.WARNING, WeaverMessages.format(WeaverMessages.NO_AROUND_ON_SYNCHRONIZATION),
getSourceLocation(), shadow.getSourceLocation());
return false;
}
}
if (hasExtraParameter() && kind == AdviceKind.AfterReturning) {
ResolvedType resolvedExtraParameterType = getExtraParameterType().resolve(world);
ResolvedType shadowReturnType = shadow.getReturnType().resolve(world);
boolean matches = (resolvedExtraParameterType.isConvertableFrom(shadowReturnType) && shadow.getKind()
.hasReturnValue());
if (matches && resolvedExtraParameterType.isParameterizedType()) {
maybeIssueUncheckedMatchWarning(resolvedExtraParameterType, shadowReturnType, shadow, world);
}
return matches;
} else if (hasExtraParameter() && kind == AdviceKind.AfterThrowing) { // pr119749
ResolvedType exceptionType = getExtraParameterType().resolve(world);
if (!exceptionType.isCheckedException() || exceptionType.getName().equals("java.lang.Exception")) { // pr292239
return true;
}
UnresolvedType[] shadowThrows = shadow.getSignature().getExceptions(world);
boolean matches = false;
for (int i = 0; i < shadowThrows.length && !matches; i++) {
ResolvedType type = shadowThrows[i].resolve(world);
if (exceptionType.isAssignableFrom(type)) {
matches = true;
}
}
return matches;
} else if (kind == AdviceKind.PerTargetEntry) {
return shadow.hasTarget();
} else if (kind == AdviceKind.PerThisEntry) {
// Groovy Constructors have a strange switch statement in them - this switch statement can leave us in places where
// the
// instance is not initialized (a super ctor hasn't been called yet).
// In these situations it isn't safe to do a perObjectBind, the instance is not initialized and cannot be passed
// over.
if (shadow.getEnclosingCodeSignature().getName().equals("")) {
if (world.resolve(shadow.getEnclosingType()).isGroovyObject()) {
return false;
}
}
return shadow.hasThis();
} else if (kind == AdviceKind.Around) {
if (shadow.getKind() == Shadow.PreInitialization) {
world.showMessage(IMessage.WARNING, WeaverMessages.format(WeaverMessages.AROUND_ON_PREINIT),
getSourceLocation(), shadow.getSourceLocation());
return false;
} else if (shadow.getKind() == Shadow.Initialization) {
world.showMessage(IMessage.WARNING, WeaverMessages.format(WeaverMessages.AROUND_ON_INIT), getSourceLocation(),
shadow.getSourceLocation());
return false;
} else if (shadow.getKind() == Shadow.StaticInitialization
&& shadow.getEnclosingType().resolve(world).isInterface()) {
world.showMessage(IMessage.ERROR, WeaverMessages.format(WeaverMessages.AROUND_ON_INTERFACE_STATICINIT, shadow
.getEnclosingType().getName()), getSourceLocation(), shadow.getSourceLocation());
return false;
} else {
// System.err.println(getSignature().getReturnType() +
// " from " + shadow.getReturnType());
if (getSignature().getReturnType().equals(UnresolvedType.VOID)) {
if (!shadow.getReturnType().equals(UnresolvedType.VOID)) {
String s = shadow.toString();
String s2 = WeaverMessages.format(WeaverMessages.NON_VOID_RETURN, s);
world.showMessage(IMessage.ERROR, s2, getSourceLocation(), shadow.getSourceLocation());
return false;
}
} else if (getSignature().getReturnType().equals(UnresolvedType.OBJECT)) {
return true;
} else {
ResolvedType shadowReturnType = shadow.getReturnType().resolve(world);
ResolvedType adviceReturnType = getSignature().getGenericReturnType().resolve(world);
if (shadowReturnType.isParameterizedType() && adviceReturnType.isRawType()) { // Set
// <
// Integer
// >
// and
// Set
ResolvedType shadowReturnGenericType = shadowReturnType.getGenericType(); // Set
ResolvedType adviceReturnGenericType = adviceReturnType.getGenericType(); // Set
if (shadowReturnGenericType.isAssignableFrom(adviceReturnGenericType)
&& world.getLint().uncheckedAdviceConversion.isEnabled()) {
world.getLint().uncheckedAdviceConversion.signal(
new String[] { shadow.toString(), shadowReturnType.getName(), adviceReturnType.getName() },
shadow.getSourceLocation(), new ISourceLocation[] { getSourceLocation() });
}
} else if (!shadowReturnType.isAssignableFrom(adviceReturnType)) {
// System.err.println(this + ", " + sourceContext +
// ", " + start);
world.showMessage(IMessage.ERROR,
WeaverMessages.format(WeaverMessages.INCOMPATIBLE_RETURN_TYPE, shadow), getSourceLocation(),
shadow.getSourceLocation());
return false;
}
}
}
}
return true;
} else {
return false;
}
}
/**
* In after returning advice if we are binding the extra parameter to a parameterized type we may not be able to do a type-safe
* conversion.
*
* @param resolvedExtraParameterType the type in the after returning declaration
* @param shadowReturnType the type at the shadow
* @param world
*/
private void maybeIssueUncheckedMatchWarning(ResolvedType afterReturningType, ResolvedType shadowReturnType, Shadow shadow,
World world) {
boolean inDoubt = !afterReturningType.isAssignableFrom(shadowReturnType);
if (inDoubt && world.getLint().uncheckedArgument.isEnabled()) {
String uncheckedMatchWith = afterReturningType.getSimpleBaseName();
if (shadowReturnType.isParameterizedType() && (shadowReturnType.getRawType() == afterReturningType.getRawType())) {
uncheckedMatchWith = shadowReturnType.getSimpleName();
}
if (!Utils.isSuppressing(getSignature().getAnnotations(), "uncheckedArgument")) {
world.getLint().uncheckedArgument.signal(new String[] { afterReturningType.getSimpleName(), uncheckedMatchWith,
afterReturningType.getSimpleBaseName(), shadow.toResolvedString(world) }, getSourceLocation(),
new ISourceLocation[] { shadow.getSourceLocation() });
}
}
}
// ----
public AdviceKind getKind() {
return kind;
}
public Member getSignature() {
return signature;
}
public boolean hasExtraParameter() {
return (getExtraParameterFlags() & ExtraArgument) != 0;
}
protected int getExtraParameterFlags() {
return attribute.getExtraParameterFlags();
}
protected int getExtraParameterCount() {
return countOnes(getExtraParameterFlags() & ParameterMask);
}
public UnresolvedType[] getBindingParameterTypes() {
return bindingParameterTypes;
}
public void setBindingParameterTypes(UnresolvedType[] types) {
bindingParameterTypes = types;
}
public static int countOnes(int bits) {
int ret = 0;
while (bits != 0) {
if ((bits & 1) != 0) {
ret += 1;
}
bits = bits >> 1;
}
return ret;
}
public int getBaseParameterCount() {
return getSignature().getParameterTypes().length - getExtraParameterCount();
}
public String[] getBaseParameterNames(World world) {
String[] allNames = getSignature().getParameterNames(world);
int extras = getExtraParameterCount();
if (extras == 0) {
return allNames;
}
String[] result = new String[getBaseParameterCount()];
for (int i = 0; i < result.length; i++) {
result[i] = allNames[i];
}
return result;
}
/**
* Return the type of the 'extra argument'. For either after returning or after throwing advice, the extra argument will be the
* returned value or the thrown exception respectively. With annotation style the user may declare the parameters in any order,
* whereas for code style they are in a well defined order. So there is some extra complexity in here for annotation style that
* looks up the correct parameter in the advice signature by name, based on the name specified in the annotation. If this fails
* then we 'fallback' to guessing at positions, where the extra argument is presumed to come at the end.
*
* @return the type of the extraParameter
*/
public UnresolvedType getExtraParameterType() {
if (!hasExtraParameter()) {
return ResolvedType.MISSING;
}
if (signature instanceof ResolvedMember) {
ResolvedMember method = (ResolvedMember) signature;
UnresolvedType[] parameterTypes = method.getGenericParameterTypes();
if (getConcreteAspect().isAnnotationStyleAspect()) {
// Examine the annotation to determine the parameter name then look it up in the parameters for the method
String[] pnames = method.getParameterNames();
if (pnames != null) {
// It is worth attempting to look up the correct parameter
AnnotationAJ[] annos = getSignature().getAnnotations();
String parameterToLookup = null;
if (annos != null && (getKind() == AdviceKind.AfterThrowing || getKind() == AdviceKind.AfterReturning)) {
for (int i = 0; i < annos.length && parameterToLookup == null; i++) {
AnnotationAJ anno = annos[i];
String annosig = anno.getType().getSignature();
if (annosig.equals("Lorg/aspectj/lang/annotation/AfterThrowing;")) {
// the 'throwing' value in the annotation will name the parameter to bind to
parameterToLookup = anno.getStringFormOfValue("throwing");
} else if (annosig.equals("Lorg/aspectj/lang/annotation/AfterReturning;")) {
// the 'returning' value in the annotation will name the parameter to bind to
parameterToLookup = anno.getStringFormOfValue("returning");
}
}
}
if (parameterToLookup != null) {
for (int i = 0; i < pnames.length; i++) {
if (pnames[i].equals(parameterToLookup)) {
return parameterTypes[i];
}
}
}
}
// Don't think this code works so well... why isnt it getBaseParameterCount()-1 ?
int baseParmCnt = getBaseParameterCount();
// bug 122742 - if we're an annotation style aspect then one
// of the extra parameters could be JoinPoint which we want
// to ignore
while ((baseParmCnt + 1 < parameterTypes.length)
&& (parameterTypes[baseParmCnt].equals(AjcMemberMaker.TYPEX_JOINPOINT)
|| parameterTypes[baseParmCnt].equals(AjcMemberMaker.TYPEX_STATICJOINPOINT) || parameterTypes[baseParmCnt]
.equals(AjcMemberMaker.TYPEX_ENCLOSINGSTATICJOINPOINT))) {
baseParmCnt++;
}
return parameterTypes[baseParmCnt];
} else {
return parameterTypes[getBaseParameterCount()];
}
} else {
return signature.getParameterTypes()[getBaseParameterCount()];
}
}
public UnresolvedType getDeclaringAspect() {
return getOriginalSignature().getDeclaringType();
}
protected Member getOriginalSignature() {
return signature;
}
protected String extraParametersToString() {
if (getExtraParameterFlags() == 0) {
return "";
} else {
return "(extraFlags: " + getExtraParameterFlags() + ")";
}
}
@Override
public Pointcut getPointcut() {
return pointcut;
}
// ----
/**
* @param fromType is guaranteed to be a non-abstract aspect
* @param clause has been concretized at a higher level
*/
@Override
public ShadowMunger concretize(ResolvedType fromType, World world, PerClause clause) {
// assert !fromType.isAbstract();
Pointcut p = pointcut.concretize(fromType, getDeclaringType(), signature.getArity(), this);
if (clause != null) {
Pointcut oldP = p;
p = new AndPointcut(clause, p);
p.copyLocationFrom(oldP);
p.state = Pointcut.CONCRETE;
// FIXME ? ATAJ copy unbound bindings to ignore
p.m_ignoreUnboundBindingForNames = oldP.m_ignoreUnboundBindingForNames;
}
Advice munger = world.getWeavingSupport().createAdviceMunger(attribute, p, signature, fromType);
munger.bindingParameterTypes = bindingParameterTypes;
munger.setDeclaringType(getDeclaringType());
// System.err.println("concretizing here " + p + " with clause " +
// clause);
return munger;
}
// ---- from object
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("(").append(getKind()).append(extraParametersToString());
sb.append(": ").append(pointcut).append("->").append(signature).append(")");
return sb.toString();
// return "("
// + getKind()
// + extraParametersToString()
// + ": "
// + pointcut
// + "->"
// + signature
// + ")";
}
// XXX this perhaps ought to take account of the other fields in advice ...
@Override
public boolean equals(Object other) {
if (!(other instanceof Advice)) {
return false;
}
Advice o = (Advice) other;
return o.kind.equals(kind) && ((o.pointcut == null) ? (pointcut == null) : o.pointcut.equals(pointcut))
&& ((o.signature == null) ? (signature == null) : o.signature.equals(signature));
// && (AsmManager.getDefault().getHandleProvider().dependsOnLocation() ? ((o.getSourceLocation() == null) ?
// (getSourceLocation() == null)
// : o.getSourceLocation().equals(getSourceLocation()))
// : true) // pr134471 - remove when handles are improved
// // to be independent of location
// ;
}
private volatile int hashCode = 0;
@Override
public int hashCode() {
if (hashCode == 0) {
int result = 17;
result = 37 * result + kind.hashCode();
result = 37 * result + ((pointcut == null) ? 0 : pointcut.hashCode());
result = 37 * result + ((signature == null) ? 0 : signature.hashCode());
hashCode = result;
}
return hashCode;
}
// ---- fields
public static final int ExtraArgument = 0x01;
public static final int ThisJoinPoint = 0x02;
public static final int ThisJoinPointStaticPart = 0x04;
public static final int ThisEnclosingJoinPointStaticPart = 0x08;
public static final int ParameterMask = 0x0f;
// For an if pointcut, this indicates it is hard wired to access a constant of either true or false
public static final int ConstantReference = 0x10;
// When the above flag is set, this indicates whether it is true or false
public static final int ConstantValue = 0x20;
// public static final int CanInline = 0x40; // didnt appear to be getting used
public static final int ThisAspectInstance = 0x40;
// cant use 0x80 ! the value is written out as a byte and -1 has special meaning (-1 is 0x80...)
// for testing only
public void setLexicalPosition(int lexicalPosition) {
start = lexicalPosition;
}
public boolean isAnnotationStyle() {
return isAnnotationStyle;
}
public ResolvedType getConcreteAspect() {
return concreteAspect;
}
public boolean hasMatchedSomething() {
return hasMatchedAtLeastOnce;
}
public void setHasMatchedSomething(boolean hasMatchedSomething) {
hasMatchedAtLeastOnce = hasMatchedSomething;
}
public abstract boolean hasDynamicTests();
}