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   1 /* *******************************************************************
   2  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
   3  * All rights reserved.
   4  * This program and the accompanying materials are made available
   5  * under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     PARC     initial implementation
  11  * ******************************************************************/
  12
  13
  14 package org.aspectj.ajdt.internal.compiler.ast;
  15
  16 import java.lang.reflect.Modifier;
  17 import java.util.ArrayList;
  18 import java.util.List;
  19
  20 import org.aspectj.ajdt.internal.compiler.lookup.EclipseFactory;
  21 import org.aspectj.ajdt.internal.compiler.lookup.EclipseTypeMunger;
  22 import org.aspectj.ajdt.internal.compiler.lookup.InterTypeScope;
  23 import org.aspectj.ajdt.internal.core.builder.EclipseSourceContext;
  24 import org.aspectj.bridge.context.CompilationAndWeavingContext;
  25 import org.aspectj.bridge.context.ContextToken;
  26 import org.aspectj.org.eclipse.jdt.core.compiler.CharOperation;
  27 import org.aspectj.org.eclipse.jdt.internal.compiler.ClassFile;
  28 import org.aspectj.org.eclipse.jdt.internal.compiler.CompilationResult;
  29 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.Annotation;
  30 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.ParameterizedQualifiedTypeReference;
  31 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.ParameterizedSingleTypeReference;
  32 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
  33 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
  34 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.TypeReference;
  35 import org.aspectj.org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
  36 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ClassScope;
  37 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.MethodScope;
  38 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ParameterizedTypeBinding;
  39 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ProblemReferenceBinding;
  40 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.RawTypeBinding;
  41 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
  42 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
  43 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeVariableBinding;
  44 import org.aspectj.weaver.AjAttribute;
  45 import org.aspectj.weaver.ResolvedMember;
  46 import org.aspectj.weaver.ResolvedTypeMunger;
  47 import org.aspectj.weaver.Shadow;
  48
  49 /**
  50  * Base type for all inter-type declarations including methods, fields and constructors.
  51  *
  52  * @author Jim Hugunin
  53  */
  54 public abstract class InterTypeDeclaration extends AjMethodDeclaration {
  55         protected TypeReference onType;
  56         protected ReferenceBinding onTypeBinding;
  57         protected ResolvedTypeMunger munger;
  58         public int declaredModifiers; // so others can see (these differ from the modifiers in the superclass)
  59         protected char[] declaredSelector;
  60
  61         /**
  62          * If targetting a generic type and wanting to use its type variables, an ITD can use an alternative name for
  63          *  them.  This is a list of strings representing the alternative names - the position in the list is used to
  64          *  match it to the real type variable in the target generic type.
  65          */
  66         protected List<String> typeVariableAliases;
  67
  68         protected InterTypeScope interTypeScope;
  69
  70         /**
  71          * When set to true, the scope hierarchy for the field/method declaration has been correctly modified to
  72          * include an intertypescope which resolves things relative to the targetted type.
  73          */
  74     private boolean scopeSetup = false;
  75
  76         // XXXAJ5 - When the compiler is changed, these will exist somewhere in it...
  77         private final static short ACC_ANNOTATION   = 0x2000;
  78         private final static short ACC_ENUM         = 0x4000;
  79
  80
  81         public InterTypeDeclaration(CompilationResult result, TypeReference onType) {
  82                 super(result);
  83                 setOnType(onType);
  84                 modifiers = ClassFileConstants.AccPublic | ClassFileConstants.AccStatic;
  85         }
  86
  87         public void setOnType(TypeReference onType) {
  88                 this.onType = onType;
  89                 determineTypeVariableAliases();
  90         }
  91
  92         public void setDeclaredModifiers(int modifiers) {
  93                 this.declaredModifiers = modifiers;
  94         }
  95
  96         public void setSelector(char[] selector) {
  97                 declaredSelector = selector;
  98                 this.selector = CharOperation.concat(selector, Integer.toHexString(sourceStart).toCharArray());
  99                 this.selector = CharOperation.concat(getPrefix(),this.selector);
 100         }
 101
 102         // return the selector prefix for this itd that is to be used before resolution replaces it with a "proper" name
 103         protected abstract char[] getPrefix();
 104
 105
 106         public void addAtAspectJAnnotations() {
 107                 if (munger == null) return;
 108                 Annotation ann = AtAspectJAnnotationFactory.createITDAnnotation(
 109                                 munger.getSignature().getDeclaringType().getName().toCharArray(),
 110                                 declaredModifiers,declaredSelector,declarationSourceStart);
 111                 AtAspectJAnnotationFactory.addAnnotation(this,ann,this.scope);
 112         }
 113
 114         /**
 115          * Checks that the target for the ITD is not an annotation.  If it is, an error message
 116          * is signaled.  We return true if it is annotation so the caller knows to stop processing.
 117          * kind is 'constructor', 'field', 'method'
 118          */
 119         public boolean isTargetAnnotation(ClassScope classScope,String kind) {
 120                 if ((onTypeBinding.getAccessFlags() & ACC_ANNOTATION)!=0) {
 121                         classScope.problemReporter().signalError(sourceStart,sourceEnd,
 122                           "can't make inter-type "+kind+" declarations on annotation types.");
 123                         ignoreFurtherInvestigation = true;
 124                         return true;
 125                 }
 126                 return false;
 127         }
 128
 129         /**
 130          * Checks that the target for the ITD is not an enum.  If it is, an error message
 131          * is signaled.  We return true if it is enum so the caller knows to stop processing.
 132          */
 133         public boolean isTargetEnum(ClassScope classScope,String kind) {
 134                 if ((onTypeBinding.getAccessFlags() & ACC_ENUM)!=0) {
 135                         classScope.problemReporter().signalError(sourceStart,sourceEnd,
 136                           "can't make inter-type "+kind+" declarations on enum types.");
 137                         ignoreFurtherInvestigation = true;
 138                         return true;
 139                 }
 140                 return false;
 141         }
 142
 143         @Override
 144         public void resolve(ClassScope upperScope) {
 145                 if (ignoreFurtherInvestigation) return;
 146
 147                 if (!scopeSetup) {
 148                   interTypeScope = new InterTypeScope(upperScope, onTypeBinding,typeVariableAliases);
 149                   scope.parent = interTypeScope;
 150                   this.scope.isStatic = Modifier.isStatic(declaredModifiers);
 151                   scopeSetup = true;
 152                 }
 153                 fixSuperCallsForInterfaceContext(upperScope);
 154                 if (ignoreFurtherInvestigation) return;
 155
 156                 super.resolve((ClassScope)scope.parent);//newParent);
 157                 fixSuperCallsInBody();
 158         }
 159
 160         private void fixSuperCallsForInterfaceContext(ClassScope scope) {
 161                 if (onTypeBinding.isInterface()) {
 162                         ContextToken tok = CompilationAndWeavingContext.enteringPhase(CompilationAndWeavingContext.FIXING_SUPER_CALLS, selector);
 163                         InterSuperFixerVisitor v =
 164                                 new InterSuperFixerVisitor(this,
 165                                                 EclipseFactory.fromScopeLookupEnvironment(scope), scope);
 166                         this.traverse(v, scope);
 167                         CompilationAndWeavingContext.leavingPhase(tok);
 168                 }
 169         }
 170
 171         /**
 172          * Called from AspectDeclarations.buildInterTypeAndPerClause
 173          */
 174         public abstract EclipseTypeMunger build(ClassScope classScope);
 175
 176         public void fixSuperCallsInBody() {
 177                 ContextToken tok = CompilationAndWeavingContext.enteringPhase(CompilationAndWeavingContext.FIXING_SUPER_CALLS_IN_ITDS, selector);
 178                 SuperFixerVisitor v = new SuperFixerVisitor(this, onTypeBinding);
 179                 this.traverse(v, (ClassScope)null);
 180                 munger.setSuperMethodsCalled(v.superMethodsCalled);
 181                 CompilationAndWeavingContext.leavingPhase(tok);
 182         }
 183
 184         protected void resolveOnType(ClassScope classScope) {
 185                 checkSpec();
 186
 187                 if (onType==null) return; // error reported elsewhere.
 188
 189                 // If they did supply a parameterized single type reference, we need to do
 190                 // some extra checks...
 191                 if (onType instanceof ParameterizedSingleTypeReference  || onType instanceof ParameterizedQualifiedTypeReference) {
 192                         resolveTypeParametersForITDOnGenericType(classScope);
 193                 } else {
 194                         onTypeBinding = (ReferenceBinding)onType.getTypeBindingPublic(classScope);
 195                         if (!onTypeBinding.isValidBinding()) {
 196                                 classScope.problemReporter().invalidType(onType, onTypeBinding);
 197                                 ignoreFurtherInvestigation = true;
 198                         }
 199                         if (onTypeBinding.isParameterizedType()) {
 200                                 // might be OK... pr132349
 201                                 ParameterizedTypeBinding ptb = (ParameterizedTypeBinding)onTypeBinding;
 202                                 if (ptb.isNestedType()) {
 203                                         if (ptb.typeVariables()==null || ptb.typeVariables().length==0) {
 204                                                 if (ptb.enclosingType().isRawType()) onTypeBinding = ptb.type;
 205                                         }
 206                                 }
 207                         }
 208                 }
 209         }
 210
 211     /**
 212      * Transform the parameterized type binding (e.g. SomeType<A,B,C>) to a
 213      * real type (e.g. SomeType).  The only kind of parameterization allowed
 214      * is with type variables and those are references to type variables on
 215      * the target type.  Once we have worked out the base generic type intended
 216      * then we do lots of checks to verify the declaration was well formed.
 217      */
 218         private void resolveTypeParametersForITDOnGenericType(ClassScope classScope) {
 219
 220                 // Collapse the parameterized reference to its generic type
 221                 if (onType instanceof ParameterizedSingleTypeReference) {
 222                         ParameterizedSingleTypeReference pref = (ParameterizedSingleTypeReference) onType;
 223                         long pos = (((long)pref.sourceStart) << 32) | pref.sourceEnd;
 224                         onType = new SingleTypeReference(pref.token,pos);
 225                 } else {
 226                         ParameterizedQualifiedTypeReference pref = (ParameterizedQualifiedTypeReference) onType;
 227                         long pos = (((long)pref.sourceStart) << 32) | pref.sourceEnd;
 228                         onType = new QualifiedTypeReference(pref.tokens,new long[]{pos});
 229
 230                 }
 231
 232                 onTypeBinding = (ReferenceBinding)onType.getTypeBindingPublic(classScope);
 233                 if (!onTypeBinding.isValidBinding()) {
 234                         classScope.problemReporter().invalidType(onType, onTypeBinding);
 235                         ignoreFurtherInvestigation = true;
 236                 }
 237
 238
 239                 if (onTypeBinding.isRawType()) {
 240                         onTypeBinding = ((RawTypeBinding)onTypeBinding).type;
 241                 }
 242
 243                 int aliasCount = (typeVariableAliases==null?0:typeVariableAliases.size());
 244
 245                 // Cannot specify a parameterized target type for the ITD if the target
 246                 // type is not generic.
 247                 if (aliasCount!=0 && !onTypeBinding.isGenericType()) {
 248                         scope.problemReporter().signalError(sourceStart,sourceEnd,
 249                                         "Type parameters can not be specified in the ITD target type - the target type "+onTypeBinding.debugName()+" is not generic.");
 250                         ignoreFurtherInvestigation = true;
 251                         return;
 252                 }
 253
 254                 // Check they have supplied the right number of type parameters on the ITD target type
 255                 if (aliasCount>0) {
 256                         if (onTypeBinding.typeVariables().length != aliasCount) { // typeParameters.length) {   phantom contains the fake ones from the ontype, typeparameters will also include extra things if it is a generic method
 257                                 scope.problemReporter().signalError(sourceStart, sourceEnd,
 258                                         "Incorrect number of type parameters supplied.  The generic type "+onTypeBinding.debugName()+" has "+
 259                                         onTypeBinding.typeVariables().length+" type parameters, not "+aliasCount+".");
 260                                 ignoreFurtherInvestigation = true;
 261                                 return;
 262                         }
 263                 }
 264
 265                 // check if they used stupid names for type variables
 266                 if (aliasCount>0) {
 267                         for (int i = 0; i < aliasCount; i++) {
 268                                 String array_element = typeVariableAliases.get(i);
 269                                 SingleTypeReference str = new SingleTypeReference(array_element.toCharArray(),0);
 270                                 TypeBinding tb = str.getTypeBindingPublic(classScope);
 271                                 if (tb!=null && !(tb instanceof ProblemReferenceBinding)) {// && !(tb instanceof TypeVariableBinding)) {
 272                                         scope.problemReporter().signalError(sourceStart,sourceEnd,
 273                                                         "Intertype declarations can only be made on the generic type, not on a parameterized type. The name '"+
 274                                                         array_element+"' cannot be used as a type parameter, since it refers to a real type.");
 275                                         ignoreFurtherInvestigation = true;
 276                                         return;
 277
 278                                 }
 279                         }
 280                 }
 281 //              TypeVariableBinding[] tVarsInGenericType = onTypeBinding.typeVariables();
 282 //              typeVariableAliases = new ArrayList(); /* Name>GenericTypeVariablePosition */ // FIXME ASC DONT THINK WE NEED TO BUILD IT HERE AS WELL...
 283 //              TypeReference[] targs = pref.typeArguments;
 284 //      if (targs!=null) {
 285 //              for (int i = 0; i < targs.length; i++) {
 286 //                      TypeReference tref = targs[i];
 287 //                      typeVariableAliases.add(CharOperation.toString(tref.getTypeName()));//tVarsInGenericType[i]);
 288 //              }
 289 //              }
 290         }
 291
 292
 293         protected void checkSpec() {
 294                 if (Modifier.isProtected(declaredModifiers)) {
 295                         scope.problemReporter().signalError(sourceStart, sourceEnd,
 296                                 "protected inter-type declarations are not allowed");
 297                         ignoreFurtherInvestigation = true;
 298                 }
 299         }
 300
 301         protected List makeEffectiveSignatureAttribute(
 302                 ResolvedMember sig,
 303                 Shadow.Kind kind,
 304                 boolean weaveBody)
 305         {
 306                 List l = new ArrayList(1);
 307                 l.add(new EclipseAttributeAdapter(
 308                                 new AjAttribute.EffectiveSignatureAttribute(sig, kind, weaveBody)));
 309                 return l;
 310         }
 311
 312         protected void setMunger(ResolvedTypeMunger munger) {
 313                 munger.getSignature().setPosition(sourceStart, sourceEnd);
 314                 munger.getSignature().setSourceContext(new EclipseSourceContext(compilationResult));
 315                 this.munger = munger;
 316         }
 317
 318         @Override
 319         protected int generateInfoAttributes(ClassFile classFile) {
 320                 List l;
 321                 Shadow.Kind kind = getShadowKindForBody();
 322                 if (kind != null) {
 323                         l = makeEffectiveSignatureAttribute(munger.getSignature(), kind, true);
 324                 } else {
 325                         l = new ArrayList(0);
 326                 }
 327                 addDeclarationStartLineAttribute(l,classFile);
 328
 329                 return classFile.generateMethodInfoAttributes(binding, l);
 330         }
 331
 332         protected abstract Shadow.Kind getShadowKindForBody();
 333
 334         public ResolvedMember getSignature() {
 335                 if (munger==null) return null; // Can be null in an erroneous program I think
 336                 return munger.getSignature();
 337         }
 338
 339         public char[] getDeclaredSelector() {
 340                 return declaredSelector;
 341         }
 342
 343         public TypeReference getOnType() {
 344                 return onType;
 345         }
 346
 347
 348         /**
 349          * Create the list of aliases based on what was supplied as parameters for the ontype.
 350          * For example, if the declaration is 'List<N>  SomeType<N>.foo' then the alias list
 351          * will simply contain 'N' and 'N' will mean 'the first type variable declared for
 352          * type SomeType'
 353          */
 354         public void determineTypeVariableAliases() {
 355                 if (onType!=null) {
 356                     // TODO loses distinction about which level the type variables are at... is that a problem?
 357                         if (onType instanceof ParameterizedSingleTypeReference) {
 358                                 ParameterizedSingleTypeReference paramRef = (ParameterizedSingleTypeReference) onType;
 359                                 TypeReference[] rb = paramRef.typeArguments;
 360                                 typeVariableAliases = new ArrayList();
 361                                 for (int i = 0; i < rb.length; i++) {
 362                                         typeVariableAliases.add(CharOperation.toString(rb[i].getTypeName()));
 363                                 }
 364                         } else if (onType instanceof ParameterizedQualifiedTypeReference) {
 365                                 ParameterizedQualifiedTypeReference paramRef = (ParameterizedQualifiedTypeReference) onType;
 366                                 typeVariableAliases = new ArrayList();
 367                                 for (int j = 0; j < paramRef.typeArguments.length; j++) {
 368                                         TypeReference[] rb = paramRef.typeArguments[j];
 369                                         for (int i = 0; rb!=null && i < rb.length; i++) {
 370                                                 typeVariableAliases.add(CharOperation.toString(rb[i].getTypeName()));
 371                                         }
 372                                 }
 373                         }
 374                 }
 375         }
 376
 377         /**
 378          * Called just before the compiler is going to start resolving elements of a declaration, this method
 379          * adds an intertypescope between the methodscope and classscope so that elements of the type targetted
 380          * by the ITD can be resolved.  For example, if type variables are referred to in the ontype for the ITD,
 381          * they have to be resolved against the ontype, not the aspect containing the ITD.
 382          */
 383         @Override
 384         public void ensureScopeSetup() {
 385                 if (scopeSetup) return; // don't do it again
 386                 MethodScope scope = this.scope;
 387
 388                 TypeReference ot = onType;
 389                 ReferenceBinding rb = null;
 390
 391                 if (ot instanceof ParameterizedQualifiedTypeReference) { // pr132349
 392                         ParameterizedQualifiedTypeReference pref = (ParameterizedQualifiedTypeReference) ot;
 393                         if (pref.typeArguments!=null && pref.typeArguments.length!=0) {
 394                                 boolean usingNonTypeVariableInITD = false;
 395                                 // Check if any of them are not type variables
 396                                 for (int i = 0; i < pref.typeArguments.length; i++) {
 397                                         TypeReference[] refs = pref.typeArguments[i];
 398                                         for (int j = 0; refs!=null && j < refs.length; j++) {
 399                                                 TypeBinding tb = refs[j].getTypeBindingPublic(scope.parent);
 400                                                 if (!tb.isTypeVariable() && !(tb instanceof ProblemReferenceBinding)) {
 401                                                         usingNonTypeVariableInITD = true;
 402                                                 }
 403
 404                                         }
 405                                 }
 406                                 if (usingNonTypeVariableInITD) {
 407                                         scope.problemReporter().signalError(sourceStart,sourceEnd,
 408                                           "Cannot make inter-type declarations on parameterized types");
 409                                         // to prevent disgusting cascading errors after this problem - lets null out what leads to them (pr105038)
 410                                         this.arguments=null;
 411                                         this.returnType=new SingleTypeReference(TypeReference.VOID,0L);
 412
 413                                         this.ignoreFurtherInvestigation=true;
 414                                         ReferenceBinding closestMatch = null;
 415                                         rb = new ProblemReferenceBinding(ot.getParameterizedTypeName(),closestMatch,0);
 416                                         onType=null;
 417                                 }
 418                         }
 419
 420                 }
 421
 422                 // Work out the real base type
 423                 if (ot instanceof ParameterizedSingleTypeReference) {
 424                         ParameterizedSingleTypeReference pref = (ParameterizedSingleTypeReference) ot;
 425                         long pos = (((long)pref.sourceStart) << 32) | pref.sourceEnd;
 426                         ot = new SingleTypeReference(pref.token,pos);
 427                 } else if (ot instanceof ParameterizedQualifiedTypeReference) {
 428                         ParameterizedQualifiedTypeReference pref = (ParameterizedQualifiedTypeReference) ot;
 429                         long pos = (((long)pref.sourceStart) << 32) | pref.sourceEnd;
 430                         ot = new QualifiedTypeReference(pref.tokens,new long[]{pos});//SingleTypeReference(pref.Quatoken,pos);
 431                 }
 432
 433                 // resolve it
 434                 if (rb==null) {
 435                   rb = (ReferenceBinding)ot.getTypeBindingPublic(scope.parent);
 436                 }
 437
 438                 // pr203646 - if we have ended up with the raw type, get back to the underlying generic one.
 439                 if (rb.isRawType() && rb.isMemberType()) {
 440                         // if the real target type used a type variable alias then we can do this OK, but need to switch things around, we want the generic type
 441                         rb = ((RawTypeBinding)rb).type;
 442                 }
 443
 444                 if (rb instanceof TypeVariableBinding) {
 445                         scope.problemReporter().signalError(sourceStart,sourceEnd,
 446                                           "Cannot make inter-type declarations on type variables, use an interface and declare parents");
 447                         // to prevent disgusting cascading errors after this problem - lets null out what leads to them (pr105038)
 448                         this.arguments=null;
 449                         this.returnType=new SingleTypeReference(TypeReference.VOID,0L);
 450
 451                         this.ignoreFurtherInvestigation=true;
 452                         ReferenceBinding closestMatch = null;
 453                         if (((TypeVariableBinding)rb).firstBound!=null) {
 454                                 closestMatch = ((TypeVariableBinding)rb).firstBound.enclosingType();
 455                         }
 456                         rb = new ProblemReferenceBinding(rb.compoundName,closestMatch,0);
 457                 }
 458
 459
 460                 // if resolution failed, give up - someone else is going to report an error
 461                 if (rb instanceof ProblemReferenceBinding) return;
 462
 463                 interTypeScope = new InterTypeScope(scope.parent, rb, typeVariableAliases);
 464                 // FIXME asc verify the choice of lines here...
 465                 // Two versions of this next line.
 466                 // First one tricks the JDT variable processing code so that it won't complain if
 467                 // you refer to a type variable from a static ITD - it *is* a problem and it *will* be caught, but later and
 468                 // by the AJDT code so we can put out a much nicer message.
 469                 scope.isStatic = (typeVariableAliases!=null?false:Modifier.isStatic(declaredModifiers));
 470                 // this is the original version in case tricking the JDT causes grief (if you reinstate this variant, you
 471                 // will need to change the expected messages output for some of the generic ITD tests)
 472                 // scope.isStatic = Modifier.isStatic(declaredModifiers);
 473                 scope.parent = interTypeScope;
 474             scopeSetup = true;
 475         }
 476 }