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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  ******************************************************************************/
  11 package net.sourceforge.phpdt.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.codegen.*;
  15 import net.sourceforge.phpdt.internal.compiler.flow.*;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.*;
  17
  18 public class ExplicitConstructorCall
  19         extends Statement
  20         implements InvocationSite {
  21
  22         public Expression[] arguments;
  23         public Expression qualification;
  24         public MethodBinding binding;
  25
  26         public int accessMode;
  27
  28         public final static int ImplicitSuper = 1;
  29         public final static int Super = 2;
  30         public final static int This = 3;
  31
  32         public VariableBinding[][] implicitArguments;
  33         boolean discardEnclosingInstance;
  34
  35         MethodBinding syntheticAccessor;
  36
  37         public ExplicitConstructorCall(int accessMode) {
  38                 this.accessMode = accessMode;
  39         }
  40
  41         public FlowInfo analyseCode(
  42                 BlockScope currentScope,
  43                 FlowContext flowContext,
  44                 FlowInfo flowInfo) {
  45
  46                 // must verify that exceptions potentially thrown by this expression are caught in the method.
  47
  48                 try {
  49                         ((MethodScope) currentScope).isConstructorCall = true;
  50
  51                         // process enclosing instance
  52                         if (qualification != null) {
  53                                 flowInfo =
  54                                         qualification
  55                                                 .analyseCode(currentScope, flowContext, flowInfo)
  56                                                 .unconditionalInits();
  57                         }
  58                         // process arguments
  59                         if (arguments != null) {
  60                                 for (int i = 0, max = arguments.length; i < max; i++) {
  61                                         flowInfo =
  62                                                 arguments[i]
  63                                                         .analyseCode(currentScope, flowContext, flowInfo)
  64                                                         .unconditionalInits();
  65                                 }
  66                         }
  67
  68                         ReferenceBinding[] thrownExceptions;
  69                         if ((thrownExceptions = binding.thrownExceptions) != NoExceptions) {
  70                                 // check exceptions
  71                                 flowContext.checkExceptionHandlers(
  72                                         thrownExceptions,
  73                                         (accessMode == ImplicitSuper)
  74                                                 ? (AstNode) currentScope.methodScope().referenceContext
  75                                                 : (AstNode) this,
  76                                         flowInfo,
  77                                         currentScope);
  78                         }
  79                         manageEnclosingInstanceAccessIfNecessary(currentScope);
  80                         manageSyntheticAccessIfNecessary(currentScope);
  81                         return flowInfo;
  82                 } finally {
  83                         ((MethodScope) currentScope).isConstructorCall = false;
  84                 }
  85         }
  86
  87         /**
  88          * Constructor call code generation
  89          *
  90          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  91          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  92          */
  93         public void generateCode(BlockScope currentScope, CodeStream codeStream) {
  94
  95                 if ((bits & IsReachableMASK) == 0) {
  96                         return;
  97                 }
  98                 try {
  99                         ((MethodScope) currentScope).isConstructorCall = true;
 100
 101                         int pc = codeStream.position;
 102                         codeStream.aload_0();
 103
 104                         // handling innerclass constructor invocation
 105                         ReferenceBinding targetType;
 106                         if ((targetType = binding.declaringClass).isNestedType()) {
 107                                 codeStream.generateSyntheticArgumentValues(
 108                                         currentScope,
 109                                         targetType,
 110                                         discardEnclosingInstance ? null : qualification,
 111                                         this);
 112                         }
 113                         // regular code gen
 114                         if (arguments != null) {
 115                                 for (int i = 0, max = arguments.length; i < max; i++) {
 116                                         arguments[i].generateCode(currentScope, codeStream, true);
 117                                 }
 118                         }
 119                         if (syntheticAccessor != null) {
 120                                 // synthetic accessor got some extra arguments appended to its signature, which need values
 121                                 for (int i = 0,
 122                                         max = syntheticAccessor.parameters.length - binding.parameters.length;
 123                                         i < max;
 124                                         i++) {
 125                                         codeStream.aconst_null();
 126                                 }
 127                                 codeStream.invokespecial(syntheticAccessor);
 128                         } else {
 129                                 codeStream.invokespecial(binding);
 130                         }
 131                         codeStream.recordPositionsFrom(pc, this.sourceStart);
 132                 } finally {
 133                         ((MethodScope) currentScope).isConstructorCall = false;
 134                 }
 135         }
 136
 137         public boolean isImplicitSuper() {
 138                 //return true if I'm of these compiler added statement super();
 139
 140                 return (accessMode == ImplicitSuper);
 141         }
 142
 143         public boolean isSuperAccess() {
 144
 145                 return accessMode != This;
 146         }
 147
 148         public boolean isTypeAccess() {
 149
 150                 return true;
 151         }
 152
 153         /* Inner emulation consists in either recording a dependency
 154          * link only, or performing one level of propagation.
 155          *
 156          * Dependency mechanism is used whenever dealing with source target
 157          * types, since by the time we reach them, we might not yet know their
 158          * exact need.
 159          */
 160         void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope) {
 161                 ReferenceBinding superType;
 162
 163                 // perform some emulation work in case there is some and we are inside a local type only
 164                 if ((superType = binding.declaringClass).isNestedType()
 165                         && currentScope.enclosingSourceType().isLocalType()) {
 166
 167                         if (superType.isLocalType()) {
 168                                 ((LocalTypeBinding) superType).addInnerEmulationDependent(
 169                                         currentScope,
 170                                         qualification != null,
 171                                         true);
 172                                 // request direct access
 173                         } else {
 174                                 // locally propagate, since we already now the desired shape for sure
 175                                 currentScope.propagateInnerEmulation(superType, qualification != null, true);
 176                                 // request direct access
 177
 178                         }
 179                 }
 180         }
 181
 182         public void manageSyntheticAccessIfNecessary(BlockScope currentScope) {
 183
 184                 // perform some emulation work in case there is some and we are inside a local type only
 185                 if (binding.isPrivate() && (accessMode != This)) {
 186
 187                         if (currentScope
 188                                 .environment()
 189                                 .options
 190                                 .isPrivateConstructorAccessChangingVisibility) {
 191                                 binding.tagForClearingPrivateModifier();
 192                                 // constructor will not be dumped as private, no emulation required thus
 193                         } else {
 194                                 syntheticAccessor =
 195                                         ((SourceTypeBinding) binding.declaringClass).addSyntheticMethod(binding);
 196                                 currentScope.problemReporter().needToEmulateMethodAccess(binding, this);
 197                         }
 198                 }
 199         }
 200
 201         public void resolve(BlockScope scope) {
 202                 // the return type should be void for a constructor.
 203                 // the test is made into getConstructor
 204
 205                 // mark the fact that we are in a constructor call.....
 206                 // unmark at all returns
 207                 try {
 208                         ((MethodScope) scope).isConstructorCall = true;
 209                         ReferenceBinding receiverType = scope.enclosingSourceType();
 210                         if (accessMode != This)
 211                                 receiverType = receiverType.superclass();
 212
 213                         if (receiverType == null) {
 214                                 return;
 215                         }
 216
 217                         // qualification should be from the type of the enclosingType
 218                         if (qualification != null) {
 219                                 if (accessMode != Super) {
 220                                         scope.problemReporter().unnecessaryEnclosingInstanceSpecification(
 221                                                 qualification,
 222                                                 receiverType);
 223                                 }
 224                                 ReferenceBinding enclosingType = receiverType.enclosingType();
 225                                 if (enclosingType == null) {
 226                                         scope.problemReporter().unnecessaryEnclosingInstanceSpecification(
 227                                                 qualification,
 228                                                 receiverType);
 229                                         discardEnclosingInstance = true;
 230                                 } else {
 231                                         TypeBinding qTb = qualification.resolveTypeExpecting(scope, enclosingType);
 232                                         qualification.implicitWidening(qTb, qTb);
 233                                 }
 234                         }
 235
 236                         // arguments buffering for the method lookup
 237                         TypeBinding[] argTypes = NoParameters;
 238                         if (arguments != null) {
 239                                 boolean argHasError = false; // typeChecks all arguments
 240                                 int length = arguments.length;
 241                                 argTypes = new TypeBinding[length];
 242                                 for (int i = 0; i < length; i++)
 243                                         if ((argTypes[i] = arguments[i].resolveType(scope)) == null)
 244                                                 argHasError = true;
 245                                 if (argHasError)
 246                                         return;
 247                         }
 248                         if ((binding = scope.getConstructor(receiverType, argTypes, this))
 249                                 .isValidBinding()) {
 250                                 if (isMethodUseDeprecated(binding, scope))
 251                                         scope.problemReporter().deprecatedMethod(binding, this);
 252
 253                                 // see for user-implicit widening conversion
 254                                 if (arguments != null) {
 255                                         int length = arguments.length;
 256                                         TypeBinding[] paramTypes = binding.parameters;
 257                                         for (int i = 0; i < length; i++)
 258                                                 arguments[i].implicitWidening(paramTypes[i], argTypes[i]);
 259                                 }
 260                         } else {
 261                                 if (binding.declaringClass == null)
 262                                         binding.declaringClass = receiverType;
 263                                 scope.problemReporter().invalidConstructor(this, binding);
 264                         }
 265                 } finally {
 266                         ((MethodScope) scope).isConstructorCall = false;
 267                 }
 268         }
 269
 270         public void setActualReceiverType(ReferenceBinding receiverType) {
 271                 // ignored
 272         }
 273
 274         public void setDepth(int depth) {
 275                 // ignore for here
 276         }
 277
 278         public void setFieldIndex(int depth) {
 279                 // ignore for here
 280         }
 281
 282         public String toString(int tab) {
 283
 284                 String s = tabString(tab);
 285                 if (qualification != null)
 286                         s = s + qualification.toStringExpression() + "."; //$NON-NLS-1$
 287                 if (accessMode == This) {
 288                         s = s + "this("; //$NON-NLS-1$
 289                 } else {
 290                         s = s + "super("; //$NON-NLS-1$
 291                 }
 292                 if (arguments != null)
 293                         for (int i = 0; i < arguments.length; i++) {
 294                                 s = s + arguments[i].toStringExpression();
 295                                 if (i != arguments.length - 1)
 296                                         s = s + ", "; //$NON-NLS-1$
 297                         }
 298                 s = s + ")"; //$NON-NLS-1$
 299                 return s;
 300         }
 301
 302         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 303
 304                 if (visitor.visit(this, scope)) {
 305                         if (qualification != null) {
 306                                 qualification.traverse(visitor, scope);
 307                         }
 308                         if (arguments != null) {
 309                                 int argumentLength = arguments.length;
 310                                 for (int i = 0; i < argumentLength; i++)
 311                                         arguments[i].traverse(visitor, scope);
 312                         }
 313                 }
 314                 visitor.endVisit(this, scope);
 315         }
 316 }