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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.patterns;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.BCException;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.IntMap;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.Shadow;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.WeaverMessages;
import org.aspectj.weaver.World;
import org.aspectj.weaver.ast.Literal;
import org.aspectj.weaver.ast.Test;
/**
* args(arguments)
*
* @author Erik Hilsdale
* @author Jim Hugunin
*/
public class ArgsPointcut extends NameBindingPointcut {
private static final String ASPECTJ_JP_SIGNATURE_PREFIX = "Lorg/aspectj/lang/JoinPoint";
private static final String ASPECTJ_SYNTHETIC_SIGNATURE_PREFIX = "Lorg/aspectj/runtime/internal/";
private TypePatternList arguments;
private String stringRepresentation;
public ArgsPointcut(TypePatternList arguments) {
this.arguments = arguments;
this.pointcutKind = ARGS;
this.stringRepresentation = "args" + arguments.toString() + "";
}
public TypePatternList getArguments() {
return arguments;
}
public Pointcut parameterizeWith(Map typeVariableMap, World w) {
ArgsPointcut ret = new ArgsPointcut(this.arguments.parameterizeWith(typeVariableMap, w));
ret.copyLocationFrom(this);
return ret;
}
public int couldMatchKinds() {
return Shadow.ALL_SHADOW_KINDS_BITS; // empty args() matches jps with no args
}
public FuzzyBoolean fastMatch(FastMatchInfo type) {
return FuzzyBoolean.MAYBE;
}
protected FuzzyBoolean matchInternal(Shadow shadow) {
ResolvedType[] argumentsToMatchAgainst = getArgumentsToMatchAgainst(shadow);
FuzzyBoolean ret = arguments.matches(argumentsToMatchAgainst, TypePattern.DYNAMIC);
return ret;
}
private ResolvedType[] getArgumentsToMatchAgainst(Shadow shadow) {
if (shadow.isShadowForArrayConstructionJoinpoint()) {
return shadow.getArgumentTypesForArrayConstructionShadow();
}
ResolvedType[] argumentsToMatchAgainst = shadow.getIWorld().resolve(shadow.getGenericArgTypes());
// special treatment for adviceexecution which may have synthetic arguments we
// want to ignore.
if (shadow.getKind() == Shadow.AdviceExecution) {
int numExtraArgs = 0;
for (int i = 0; i < argumentsToMatchAgainst.length; i++) {
String argumentSignature = argumentsToMatchAgainst[i].getSignature();
if (argumentSignature.startsWith(ASPECTJ_JP_SIGNATURE_PREFIX)
|| argumentSignature.startsWith(ASPECTJ_SYNTHETIC_SIGNATURE_PREFIX)) {
numExtraArgs++;
} else {
// normal arg after AJ type means earlier arg was NOT synthetic
numExtraArgs = 0;
}
}
if (numExtraArgs > 0) {
int newArgLength = argumentsToMatchAgainst.length - numExtraArgs;
ResolvedType[] argsSubset = new ResolvedType[newArgLength];
System.arraycopy(argumentsToMatchAgainst, 0, argsSubset, 0, newArgLength);
argumentsToMatchAgainst = argsSubset;
}
} else if (shadow.getKind() == Shadow.ConstructorExecution) {
if (shadow.getMatchingSignature().getParameterTypes().length < argumentsToMatchAgainst.length) {
// there are one or more synthetic args on the end, caused by non-public itd constructor
int newArgLength = shadow.getMatchingSignature().getParameterTypes().length;
ResolvedType[] argsSubset = new ResolvedType[newArgLength];
System.arraycopy(argumentsToMatchAgainst, 0, argsSubset, 0, newArgLength);
argumentsToMatchAgainst = argsSubset;
}
}
return argumentsToMatchAgainst;
}
public List getBindingAnnotationTypePatterns() {
return Collections.emptyList();
}
public List getBindingTypePatterns() {
List l = new ArrayList();
TypePattern[] pats = arguments.getTypePatterns();
for (int i = 0; i < pats.length; i++) {
if (pats[i] instanceof BindingTypePattern) {
l.add((BindingTypePattern)pats[i]);
}
}
return l;
}
public void write(CompressingDataOutputStream s) throws IOException {
s.writeByte(Pointcut.ARGS);
arguments.write(s);
writeLocation(s);
}
public static Pointcut read(VersionedDataInputStream s, ISourceContext context) throws IOException {
ArgsPointcut ret = new ArgsPointcut(TypePatternList.read(s, context));
ret.readLocation(context, s);
return ret;
}
public boolean equals(Object other) {
if (!(other instanceof ArgsPointcut)) {
return false;
}
ArgsPointcut o = (ArgsPointcut) other;
return o.arguments.equals(this.arguments);
}
public int hashCode() {
return arguments.hashCode();
}
public void resolveBindings(IScope scope, Bindings bindings) {
arguments.resolveBindings(scope, bindings, true, true);
if (arguments.ellipsisCount > 1) {
scope.message(IMessage.ERROR, this, "uses more than one .. in args (compiler limitation)");
}
}
public void postRead(ResolvedType enclosingType) {
arguments.postRead(enclosingType);
}
public Pointcut concretize1(ResolvedType inAspect, ResolvedType declaringType, IntMap bindings) {
if (isDeclare(bindings.getEnclosingAdvice())) {
// Enforce rule about which designators are supported in declare
inAspect.getWorld().showMessage(IMessage.ERROR, WeaverMessages.format(WeaverMessages.ARGS_IN_DECLARE),
bindings.getEnclosingAdvice().getSourceLocation(), null);
return Pointcut.makeMatchesNothing(Pointcut.CONCRETE);
}
TypePatternList args = arguments.resolveReferences(bindings);
if (inAspect.crosscuttingMembers != null) {
inAspect.crosscuttingMembers.exposeTypes(args.getExactTypes());
}
Pointcut ret = new ArgsPointcut(args);
ret.copyLocationFrom(this);
return ret;
}
private Test findResidueNoEllipsis(Shadow shadow, ExposedState state, TypePattern[] patterns) {
ResolvedType[] argumentsToMatchAgainst = getArgumentsToMatchAgainst(shadow);
int len = argumentsToMatchAgainst.length;
// System.err.println("boudn to : " + len + ", " + patterns.length);
if (patterns.length != len) {
return Literal.FALSE;
}
Test ret = Literal.TRUE;
for (int i = 0; i < len; i++) {
UnresolvedType argType = shadow.getGenericArgTypes()[i];
TypePattern type = patterns[i];
ResolvedType argRTX = shadow.getIWorld().resolve(argType, true);
if (!(type instanceof BindingTypePattern)) {
if (argRTX.isMissing()) {
shadow.getIWorld().getLint().cantFindType.signal(new String[] { WeaverMessages.format(
WeaverMessages.CANT_FIND_TYPE_ARG_TYPE, argType.getName()) }, shadow.getSourceLocation(),
new ISourceLocation[] { getSourceLocation() });
// IMessage msg = new Message(
// WeaverMessages.format(WeaverMessages.CANT_FIND_TYPE_ARG_TYPE,argType.getName()),
// "",IMessage.ERROR,shadow.getSourceLocation(),null,new ISourceLocation[]{getSourceLocation()});
// shadow.getIWorld().getMessageHandler().handleMessage(msg);
}
if (type.matchesInstanceof(argRTX).alwaysTrue()) {
continue;
}
}
World world = shadow.getIWorld();
ResolvedType typeToExpose = type.getExactType().resolve(world);
if (typeToExpose.isParameterizedType()) {
boolean inDoubt = (type.matchesInstanceof(argRTX) == FuzzyBoolean.MAYBE);
if (inDoubt && world.getLint().uncheckedArgument.isEnabled()) {
String uncheckedMatchWith = typeToExpose.getSimpleBaseName();
if (argRTX.isParameterizedType() && (argRTX.getRawType() == typeToExpose.getRawType())) {
uncheckedMatchWith = argRTX.getSimpleName();
}
if (!isUncheckedArgumentWarningSuppressed()) {
world.getLint().uncheckedArgument.signal(new String[] { typeToExpose.getSimpleName(), uncheckedMatchWith,
typeToExpose.getSimpleBaseName(), shadow.toResolvedString(world) }, getSourceLocation(),
new ISourceLocation[] { shadow.getSourceLocation() });
}
}
}
ret = Test.makeAnd(ret, exposeStateForVar(shadow.getArgVar(i), type, state, shadow.getIWorld()));
}
return ret;
}
/**
* We need to find out if someone has put the @SuppressAjWarnings{"uncheckedArgument"} annotation somewhere. That somewhere is
* going to be an a piece of advice that uses this pointcut. But how do we find it???
*
* @return
*/
private boolean isUncheckedArgumentWarningSuppressed() {
return false;
}
protected Test findResidueInternal(Shadow shadow, ExposedState state) {
ResolvedType[] argsToMatch = getArgumentsToMatchAgainst(shadow);
if (arguments.matches(argsToMatch, TypePattern.DYNAMIC).alwaysFalse()) {
return Literal.FALSE;
}
int ellipsisCount = arguments.ellipsisCount;
if (ellipsisCount == 0) {
return findResidueNoEllipsis(shadow, state, arguments.getTypePatterns());
} else if (ellipsisCount == 1) {
TypePattern[] patternsWithEllipsis = arguments.getTypePatterns();
TypePattern[] patternsWithoutEllipsis = new TypePattern[argsToMatch.length];
int lenWithEllipsis = patternsWithEllipsis.length;
int lenWithoutEllipsis = patternsWithoutEllipsis.length;
// l1+1 >= l0
int indexWithEllipsis = 0;
int indexWithoutEllipsis = 0;
while (indexWithoutEllipsis < lenWithoutEllipsis) {
TypePattern p = patternsWithEllipsis[indexWithEllipsis++];
if (p == TypePattern.ELLIPSIS) {
int newLenWithoutEllipsis = lenWithoutEllipsis - (lenWithEllipsis - indexWithEllipsis);
while (indexWithoutEllipsis < newLenWithoutEllipsis) {
patternsWithoutEllipsis[indexWithoutEllipsis++] = TypePattern.ANY;
}
} else {
patternsWithoutEllipsis[indexWithoutEllipsis++] = p;
}
}
return findResidueNoEllipsis(shadow, state, patternsWithoutEllipsis);
} else {
throw new BCException("unimplemented");
}
}
public String toString() {
return this.stringRepresentation;
}
public Object accept(PatternNodeVisitor visitor, Object data) {
return visitor.visit(this, data);
}
}