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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 Common Public License v1.0
   6  * which accompanies this distribution and is available at
   7  * http://www.eclipse.org/legal/cpl-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 org.aspectj.ajdt.internal.compiler.lookup.*;
  18 import org.aspectj.bridge.ISourceLocation;
  19 import org.aspectj.weaver.*;
  20 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.MarkerAnnotation;
  21 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.StringLiteral;
  22 import org.aspectj.org.eclipse.jdt.internal.compiler.ClassFile;
  23 import org.aspectj.org.eclipse.jdt.internal.compiler.CompilationResult;
  24 import org.aspectj.org.eclipse.jdt.internal.compiler.ast.*;
  25 import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.*;
  26 import org.aspectj.org.eclipse.jdt.internal.compiler.parser.Parser;
  27
  28 /**
  29  * An inter-type constructor declaration.
  30  *
  31  * This will generate two implementation methods in the aspect, the main one for the body
  32  * of the constructor, and an additional <code>preMethod</code> for the code that
  33  * runs before the super constructor is called.
  34  *
  35  * @author Jim Hugunin
  36  */
  37 public class InterTypeConstructorDeclaration extends InterTypeDeclaration {
  38         private static final String SUPPRESSAJWARNINGS = "Lorg/aspectj/lang/annotation/SuppressAjWarnings;";
  39         private static final String NOEXPLICITCONSTRUCTORCALL = "noExplicitConstructorCall";
  40         private MethodDeclaration preMethod;
  41         private ExplicitConstructorCall explicitConstructorCall = null;
  42
  43         public InterTypeConstructorDeclaration(CompilationResult result, TypeReference onType) {
  44                 super(result, onType);
  45         }
  46
  47         public void parseStatements(Parser parser, CompilationUnitDeclaration unit) {
  48                 if (ignoreFurtherInvestigation)
  49                         return;
  50             parser.parse(this, unit);
  51         }
  52
  53         protected char[] getPrefix() {
  54                 return (NameMangler.ITD_PREFIX + "interConstructor$").toCharArray();
  55         }
  56
  57         public void resolve(ClassScope upperScope) {
  58                 if (munger == null || binding == null) ignoreFurtherInvestigation = true;
  59                 if (ignoreFurtherInvestigation) return;
  60
  61                 explicitConstructorCall = null;
  62                 if (statements != null && statements.length > 0 &&
  63                         statements[0] instanceof ExplicitConstructorCall)
  64                 {
  65                         explicitConstructorCall = (ExplicitConstructorCall) statements[0];
  66                         statements = AstUtil.remove(0, statements);
  67                 }
  68
  69                 preMethod = makePreMethod(upperScope, explicitConstructorCall);
  70
  71                 binding.parameters  = AstUtil.insert(onTypeBinding, binding.parameters);
  72                 this.arguments = AstUtil.insert(
  73                         AstUtil.makeFinalArgument("ajc$this_".toCharArray(), onTypeBinding),
  74                         this.arguments);
  75
  76                 super.resolve(upperScope);
  77
  78                 // after annotations have been resolved...
  79                 if (explicitConstructorCall == null) {
  80                         raiseNoFieldInitializersWarning();
  81                 }
  82         }
  83
  84         /**
  85          * Warning added in response to PR 62606 - if an ITD constructor does not make an explicit constructor
  86          * call then field initializers in the target class will not be executed leading to unexpected behaviour.
  87          */
  88         private void raiseNoFieldInitializersWarning() {
  89                 if (suppressingNoExplicitConstructorCall()) return;
  90                 EclipseFactory world = EclipseFactory.fromScopeLookupEnvironment(scope);
  91                 ISourceLocation location =
  92                         new EclipseSourceLocation(scope.problemReporter().referenceContext.compilationResult(),
  93                                                                         sourceStart(),sourceEnd());
  94                 world.getWorld().getLint().noExplicitConstructorCall.signal(null, location);
  95         }
  96
  97         /**
  98          * true iff constructor has @SuppressAjWarnings or @SuppressAjWarnings("xyz,noExplicitConstructorCall,def,...")
  99          * @return
 100          */
 101         private boolean suppressingNoExplicitConstructorCall() {
 102                 if (this.annotations == null) return false;
 103                 for (int i = 0; i < this.annotations.length; i++) {
 104                         if (new String(this.annotations[i].resolvedType.signature()).equals(SUPPRESSAJWARNINGS)) {
 105                                 if (this.annotations[i] instanceof MarkerAnnotation) {
 106                                         return true;
 107                                 } else if (this.annotations[i] instanceof SingleMemberAnnotation){
 108                                         SingleMemberAnnotation sma = (SingleMemberAnnotation) this.annotations[i];
 109                                         if (sma.memberValue instanceof ArrayInitializer) {
 110                                                 ArrayInitializer memberValue = (ArrayInitializer) sma.memberValue;
 111                                                 for (int j = 0; j < memberValue.expressions.length; j++) {
 112                                                         if (memberValue.expressions[j] instanceof StringLiteral) {
 113                                                                 StringLiteral val = (StringLiteral) memberValue.expressions[j];
 114                                                                 if (new String(val.source()).equals(NOEXPLICITCONSTRUCTORCALL)) return true;
 115                                                         }
 116                                                 }
 117                                         }
 118                                 }
 119                         }
 120                 }
 121                 return false;
 122         }
 123
 124         private MethodDeclaration makePreMethod(ClassScope scope,
 125                                                                                         ExplicitConstructorCall explicitConstructorCall)
 126         {
 127                 EclipseFactory world = EclipseFactory.fromScopeLookupEnvironment(scope);
 128
 129                 UnresolvedType aspectTypeX = world.fromBinding(binding.declaringClass);
 130                 UnresolvedType targetTypeX = world.fromBinding(onTypeBinding);
 131
 132                 ArrayBinding objectArrayBinding = scope.createArrayType(scope.getJavaLangObject(), 1);
 133
 134
 135                 MethodDeclaration pre = new MethodDeclaration(compilationResult);
 136                 pre.modifiers = AccPublic | AccStatic;
 137                 pre.returnType = AstUtil.makeTypeReference(objectArrayBinding);
 138                 pre.selector = NameMangler.postIntroducedConstructor(aspectTypeX, targetTypeX).toCharArray();
 139
 140
 141                 pre.arguments = AstUtil.copyArguments(this.arguments);
 142
 143                 //XXX should do exceptions
 144
 145                 pre.scope = new MethodScope(scope, pre, true);
 146                 //??? do we need to do anything with scope???
 147
 148
 149
 150         // Use the factory to build a semi-correct resolvedmember - then patch it up with
 151         // reset calls.  This is SAFE
 152                 ResolvedMember preIntroducedConstructorRM = world.makeResolvedMember(binding);
 153                 preIntroducedConstructorRM.resetName(NameMangler.preIntroducedConstructor(aspectTypeX, targetTypeX));
 154                 preIntroducedConstructorRM.resetModifiers(Modifier.PUBLIC | Modifier.STATIC | Modifier.FINAL);
 155                 preIntroducedConstructorRM.resetReturnTypeToObjectArray();
 156
 157                 pre.binding = world.makeMethodBinding(preIntroducedConstructorRM);
 158
 159                 pre.bindArguments();
 160                 pre.bindThrownExceptions();
 161
 162
 163                 if (explicitConstructorCall == null) {
 164                         pre.statements = new Statement[] {};
 165                 } else {
 166                         pre.statements = new Statement[] {
 167                                 explicitConstructorCall
 168                         };
 169                 }
 170
 171                 InterTypeScope newParent =
 172                         new InterTypeScope(scope, onTypeBinding);
 173                 pre.scope.parent = newParent;
 174
 175                 pre.resolveStatements(); //newParent);
 176
 177
 178
 179                 int nParams = pre.arguments.length;
 180                 MethodBinding explicitConstructor = null;
 181                 if (explicitConstructorCall != null) {
 182                         explicitConstructor = explicitConstructorCall.binding;
 183                         // If it is null then we are going to report something else is wrong with this code!
 184                         if (explicitConstructor!=null && explicitConstructor.alwaysNeedsAccessMethod()) {
 185                                 explicitConstructor = explicitConstructor.getAccessMethod(true);
 186                         }
 187                 }
 188
 189                 int nExprs;
 190                 if (explicitConstructor == null) nExprs = 0;
 191                 else nExprs = explicitConstructor.parameters.length;
 192
 193
 194                 ArrayInitializer init = new ArrayInitializer();
 195                 init.expressions = new Expression[nExprs + nParams];
 196                 int index = 0;
 197                 for (int i=0; i < nExprs; i++) {
 198                         if (i >= explicitConstructorCall.arguments.length) {
 199                                 init.expressions[index++] = new NullLiteral(0, 0);
 200                                 continue;
 201                         }
 202
 203
 204                         Expression arg = explicitConstructorCall.arguments[i];
 205                         ResolvedMember conversionMethod =
 206                                 AjcMemberMaker.toObjectConversionMethod(world.fromBinding(explicitConstructorCall.binding.parameters[i]));
 207                         if (conversionMethod != null) {
 208                                 arg = new KnownMessageSend(world.makeMethodBindingForCall(conversionMethod),
 209                                         new CastExpression(new NullLiteral(0, 0),
 210                                                 AstUtil.makeTypeReference(world.makeTypeBinding(AjcMemberMaker.CONVERSIONS_TYPE))),
 211                                     new Expression[] {arg });
 212                         }
 213                         init.expressions[index++] = arg;
 214                 }
 215
 216                 for (int i=0; i < nParams; i++) {
 217                         LocalVariableBinding binding = pre.arguments[i].binding;
 218                         Expression arg = AstUtil.makeResolvedLocalVariableReference(binding);
 219                         ResolvedMember conversionMethod =
 220                                 AjcMemberMaker.toObjectConversionMethod(world.fromBinding(binding.type));
 221                         if (conversionMethod != null) {
 222                                 arg = new KnownMessageSend(world.makeMethodBindingForCall(conversionMethod),
 223                                         new CastExpression(new NullLiteral(0, 0),
 224                                                 AstUtil.makeTypeReference(world.makeTypeBinding(AjcMemberMaker.CONVERSIONS_TYPE))),
 225                                     new Expression[] {arg });
 226                         }
 227                         init.expressions[index++] = arg;
 228                 }
 229
 230                 init.binding =objectArrayBinding;
 231
 232                 ArrayAllocationExpression newArray = new ArrayAllocationExpression();
 233                 newArray.initializer = init;
 234                 newArray.type = AstUtil.makeTypeReference(scope.getJavaLangObject());
 235                 newArray.dimensions = new Expression[1];
 236                 newArray.constant = NotAConstant;
 237
 238
 239
 240
 241                 pre.statements = new Statement[] {
 242                         new ReturnStatement(newArray, 0, 0),
 243                 };
 244                 return pre;
 245         }
 246
 247
 248
 249
 250
 251
 252         public EclipseTypeMunger build(ClassScope classScope) {
 253                 EclipseFactory world = EclipseFactory.fromScopeLookupEnvironment(classScope);
 254
 255                 resolveOnType(classScope);
 256                 if (ignoreFurtherInvestigation) return null;
 257
 258                 binding = classScope.referenceContext.binding.resolveTypesFor(binding);
 259
 260                 if (isTargetAnnotation(classScope,"constructor")) return null; // Error message output in isTargetAnnotation
 261                 if (isTargetEnum(classScope,"constructor")) return null;       // Error message output in isTargetEnum
 262
 263                 if (onTypeBinding.isInterface()) {
 264                         classScope.problemReporter().signalError(sourceStart, sourceEnd,
 265                                                         "can't define constructors on interfaces");
 266                         ignoreFurtherInvestigation = true;
 267                         return null;
 268                 }
 269
 270                 if (onTypeBinding.isNestedType()) {
 271                         classScope.problemReporter().signalError(sourceStart, sourceEnd,
 272                                 "can't define constructors on nested types (compiler limitation)");
 273                         ignoreFurtherInvestigation = true;
 274                         return null;
 275                 }
 276
 277                 ResolvedType declaringTypeX = world.fromEclipse(onTypeBinding);
 278                 ResolvedType aspectType = world.fromEclipse(classScope.referenceContext.binding);
 279
 280                 if (interTypeScope==null) return null; // We encountered a problem building the scope, don't continue - error already reported
 281
 282
 283                 // This signature represents what we want consumers of the targetted type to 'see'
 284                 ResolvedMember signature = world.makeResolvedMemberForITD(binding,onTypeBinding,interTypeScope.getRecoveryAliases());
 285                 signature.resetKind(Member.CONSTRUCTOR);
 286                 signature.resetName("<init>");
 287                 int resetModifiers = declaredModifiers;
 288                 if (binding.isVarargs())  resetModifiers = resetModifiers | Constants.ACC_VARARGS;
 289                 signature.resetModifiers(resetModifiers);
 290
 291                 ResolvedMember syntheticInterMember =
 292                         AjcMemberMaker.interConstructor(declaringTypeX,  signature, aspectType);
 293
 294                 NewConstructorTypeMunger myMunger =
 295                         new NewConstructorTypeMunger(signature, syntheticInterMember, null, null,typeVariableAliases);
 296                 setMunger(myMunger);
 297                 myMunger.check(world.getWorld());
 298
 299                 this.selector = binding.selector =
 300                         NameMangler.postIntroducedConstructor(
 301                                 world.fromBinding(binding.declaringClass),
 302                                 declaringTypeX).toCharArray();
 303
 304                 return new EclipseTypeMunger(world, myMunger, aspectType, this);
 305         }
 306
 307
 308         private AjAttribute makeAttribute(EclipseFactory world) {
 309                 if (explicitConstructorCall != null && (explicitConstructorCall.binding!=null) && !(explicitConstructorCall.binding instanceof ProblemMethodBinding)) {
 310                         MethodBinding explicitConstructor = explicitConstructorCall.binding;
 311                         if (explicitConstructor.alwaysNeedsAccessMethod()) {
 312                                 explicitConstructor = explicitConstructor.getAccessMethod(true);
 313                         }
 314
 315                         ((NewConstructorTypeMunger)munger).setExplicitConstructor(
 316                                 world.makeResolvedMember(explicitConstructor));
 317                 } else {
 318                         ((NewConstructorTypeMunger)munger).setExplicitConstructor(
 319                                 new ResolvedMemberImpl(Member.CONSTRUCTOR,
 320                                         world.fromBinding(onTypeBinding.superclass()),
 321                                         0, ResolvedType.VOID, "<init>", UnresolvedType.NONE));
 322                 }
 323                 return new AjAttribute.TypeMunger(munger);
 324         }
 325
 326
 327         public void generateCode(ClassScope classScope, ClassFile classFile) {
 328                 if (ignoreFurtherInvestigation) return;
 329                 EclipseFactory world = EclipseFactory.fromScopeLookupEnvironment(classScope);
 330                 classFile.extraAttributes.add(new EclipseAttributeAdapter(makeAttribute(world)));
 331                 super.generateCode(classScope, classFile);
 332
 333                 preMethod.generateCode(classScope, classFile);
 334         }
 335         protected Shadow.Kind getShadowKindForBody() {
 336                 return Shadow.ConstructorExecution;
 337         }
 338
 339 }