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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.CodeStream;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.InvocationSite;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.LocalTypeBinding;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.MethodScope;
  22 import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
  23 import net.sourceforge.phpdt.internal.compiler.lookup.SourceTypeBinding;
  24 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  25 import net.sourceforge.phpdt.internal.compiler.lookup.VariableBinding;
  26
  27 public class ExplicitConstructorCall
  28         extends Statement
  29         implements InvocationSite {
  30
  31         public Expression[] arguments;
  32         public Expression qualification;
  33         public MethodBinding binding;
  34
  35         public int accessMode;
  36
  37         public final static int ImplicitSuper = 1;
  38         public final static int Super = 2;
  39         public final static int This = 3;
  40
  41         public VariableBinding[][] implicitArguments;
  42         boolean discardEnclosingInstance;
  43
  44         MethodBinding syntheticAccessor;
  45
  46         public ExplicitConstructorCall(int accessMode) {
  47                 this.accessMode = accessMode;
  48         }
  49
  50         public FlowInfo analyseCode(
  51                 BlockScope currentScope,
  52                 FlowContext flowContext,
  53                 FlowInfo flowInfo) {
  54
  55                 // must verify that exceptions potentially thrown by this expression are caught in the method.
  56
  57                 try {
  58                         ((MethodScope) currentScope).isConstructorCall = true;
  59
  60                         // process enclosing instance
  61                         if (qualification != null) {
  62                                 flowInfo =
  63                                         qualification
  64                                                 .analyseCode(currentScope, flowContext, flowInfo)
  65                                                 .unconditionalInits();
  66                         }
  67                         // process arguments
  68                         if (arguments != null) {
  69                                 for (int i = 0, max = arguments.length; i < max; i++) {
  70                                         flowInfo =
  71                                                 arguments[i]
  72                                                         .analyseCode(currentScope, flowContext, flowInfo)
  73                                                         .unconditionalInits();
  74                                 }
  75                         }
  76
  77                         ReferenceBinding[] thrownExceptions;
  78                         if ((thrownExceptions = binding.thrownExceptions) != NoExceptions) {
  79                                 // check exceptions
  80                                 flowContext.checkExceptionHandlers(
  81                                         thrownExceptions,
  82                                         (accessMode == ImplicitSuper)
  83                                                 ? (AstNode) currentScope.methodScope().referenceContext
  84                                                 : (AstNode) this,
  85                                         flowInfo,
  86                                         currentScope);
  87                         }
  88                         manageEnclosingInstanceAccessIfNecessary(currentScope);
  89                         manageSyntheticAccessIfNecessary(currentScope);
  90                         return flowInfo;
  91                 } finally {
  92                         ((MethodScope) currentScope).isConstructorCall = false;
  93                 }
  94         }
  95
  96         /**
  97          * Constructor call code generation
  98          *
  99          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
 100          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
 101          */
 102         public void generateCode(BlockScope currentScope, CodeStream codeStream) {
 103
 104                 if ((bits & IsReachableMASK) == 0) {
 105                         return;
 106                 }
 107                 try {
 108                         ((MethodScope) currentScope).isConstructorCall = true;
 109
 110                         int pc = codeStream.position;
 111                         codeStream.aload_0();
 112
 113                         // handling innerclass constructor invocation
 114                         ReferenceBinding targetType;
 115                         if ((targetType = binding.declaringClass).isNestedType()) {
 116                                 codeStream.generateSyntheticArgumentValues(
 117                                         currentScope,
 118                                         targetType,
 119                                         discardEnclosingInstance ? null : qualification,
 120                                         this);
 121                         }
 122                         // regular code gen
 123                         if (arguments != null) {
 124                                 for (int i = 0, max = arguments.length; i < max; i++) {
 125                                         arguments[i].generateCode(currentScope, codeStream, true);
 126                                 }
 127                         }
 128                         if (syntheticAccessor != null) {
 129                                 // synthetic accessor got some extra arguments appended to its signature, which need values
 130                                 for (int i = 0,
 131                                         max = syntheticAccessor.parameters.length - binding.parameters.length;
 132                                         i < max;
 133                                         i++) {
 134                                         codeStream.aconst_null();
 135                                 }
 136                                 codeStream.invokespecial(syntheticAccessor);
 137                         } else {
 138                                 codeStream.invokespecial(binding);
 139                         }
 140                         codeStream.recordPositionsFrom(pc, this.sourceStart);
 141                 } finally {
 142                         ((MethodScope) currentScope).isConstructorCall = false;
 143                 }
 144         }
 145
 146         public boolean isImplicitSuper() {
 147                 //return true if I'm of these compiler added statement super();
 148
 149                 return (accessMode == ImplicitSuper);
 150         }
 151
 152         public boolean isSuperAccess() {
 153
 154                 return accessMode != This;
 155         }
 156
 157         public boolean isTypeAccess() {
 158
 159                 return true;
 160         }
 161
 162         /* Inner emulation consists in either recording a dependency
 163          * link only, or performing one level of propagation.
 164          *
 165          * Dependency mechanism is used whenever dealing with source target
 166          * types, since by the time we reach them, we might not yet know their
 167          * exact need.
 168          */
 169         void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope) {
 170                 ReferenceBinding superType;
 171
 172                 // perform some emulation work in case there is some and we are inside a local type only
 173                 if ((superType = binding.declaringClass).isNestedType()
 174                         && currentScope.enclosingSourceType().isLocalType()) {
 175
 176                         if (superType.isLocalType()) {
 177                                 ((LocalTypeBinding) superType).addInnerEmulationDependent(
 178                                         currentScope,
 179                                         qualification != null,
 180                                         true);
 181                                 // request direct access
 182                         } else {
 183                                 // locally propagate, since we already now the desired shape for sure
 184                                 currentScope.propagateInnerEmulation(superType, qualification != null, true);
 185                                 // request direct access
 186
 187                         }
 188                 }
 189         }
 190
 191         public void manageSyntheticAccessIfNecessary(BlockScope currentScope) {
 192
 193                 // perform some emulation work in case there is some and we are inside a local type only
 194                 if (binding.isPrivate() && (accessMode != This)) {
 195
 196                         if (currentScope
 197                                 .environment()
 198                                 .options
 199                                 .isPrivateConstructorAccessChangingVisibility) {
 200                                 binding.tagForClearingPrivateModifier();
 201                                 // constructor will not be dumped as private, no emulation required thus
 202                         } else {
 203                                 syntheticAccessor =
 204                                         ((SourceTypeBinding) binding.declaringClass).addSyntheticMethod(binding);
 205                                 currentScope.problemReporter().needToEmulateMethodAccess(binding, this);
 206                         }
 207                 }
 208         }
 209
 210         public void resolve(BlockScope scope) {
 211                 // the return type should be void for a constructor.
 212                 // the test is made into getConstructor
 213
 214                 // mark the fact that we are in a constructor call.....
 215                 // unmark at all returns
 216                 try {
 217                         ((MethodScope) scope).isConstructorCall = true;
 218                         ReferenceBinding receiverType = scope.enclosingSourceType();
 219                         if (accessMode != This)
 220                                 receiverType = receiverType.superclass();
 221
 222                         if (receiverType == null) {
 223                                 return;
 224                         }
 225
 226                         // qualification should be from the type of the enclosingType
 227                         if (qualification != null) {
 228                                 if (accessMode != Super) {
 229                                         scope.problemReporter().unnecessaryEnclosingInstanceSpecification(
 230                                                 qualification,
 231                                                 receiverType);
 232                                 }
 233                                 ReferenceBinding enclosingType = receiverType.enclosingType();
 234                                 if (enclosingType == null) {
 235                                         scope.problemReporter().unnecessaryEnclosingInstanceSpecification(
 236                                                 qualification,
 237                                                 receiverType);
 238                                         discardEnclosingInstance = true;
 239                                 } else {
 240                                         TypeBinding qTb = qualification.resolveTypeExpecting(scope, enclosingType);
 241                                         qualification.implicitWidening(qTb, qTb);
 242                                 }
 243                         }
 244
 245                         // arguments buffering for the method lookup
 246                         TypeBinding[] argTypes = NoParameters;
 247                         if (arguments != null) {
 248                                 boolean argHasError = false; // typeChecks all arguments
 249                                 int length = arguments.length;
 250                                 argTypes = new TypeBinding[length];
 251                                 for (int i = 0; i < length; i++)
 252                                         if ((argTypes[i] = arguments[i].resolveType(scope)) == null)
 253                                                 argHasError = true;
 254                                 if (argHasError)
 255                                         return;
 256                         }
 257                         if ((binding = scope.getConstructor(receiverType, argTypes, this))
 258                                 .isValidBinding()) {
 259                                 if (isMethodUseDeprecated(binding, scope))
 260                                         scope.problemReporter().deprecatedMethod(binding, this);
 261
 262                                 // see for user-implicit widening conversion
 263                                 if (arguments != null) {
 264                                         int length = arguments.length;
 265                                         TypeBinding[] paramTypes = binding.parameters;
 266                                         for (int i = 0; i < length; i++)
 267                                                 arguments[i].implicitWidening(paramTypes[i], argTypes[i]);
 268                                 }
 269                         } else {
 270                                 if (binding.declaringClass == null)
 271                                         binding.declaringClass = receiverType;
 272                                 scope.problemReporter().invalidConstructor(this, binding);
 273                         }
 274                 } finally {
 275                         ((MethodScope) scope).isConstructorCall = false;
 276                 }
 277         }
 278
 279         public void setActualReceiverType(ReferenceBinding receiverType) {
 280                 // ignored
 281         }
 282
 283         public void setDepth(int depth) {
 284                 // ignore for here
 285         }
 286
 287         public void setFieldIndex(int depth) {
 288                 // ignore for here
 289         }
 290
 291         public String toString(int tab) {
 292
 293                 String s = tabString(tab);
 294                 if (qualification != null)
 295                         s = s + qualification.toStringExpression() + "."; //$NON-NLS-1$
 296                 if (accessMode == This) {
 297                         s = s + "this("; //$NON-NLS-1$
 298                 } else {
 299                         s = s + "super("; //$NON-NLS-1$
 300                 }
 301                 if (arguments != null)
 302                         for (int i = 0; i < arguments.length; i++) {
 303                                 s = s + arguments[i].toStringExpression();
 304                                 if (i != arguments.length - 1)
 305                                         s = s + ", "; //$NON-NLS-1$
 306                         }
 307                 s = s + ")"; //$NON-NLS-1$
 308                 return s;
 309         }
 310
 311         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 312
 313                 if (visitor.visit(this, scope)) {
 314                         if (qualification != null) {
 315                                 qualification.traverse(visitor, scope);
 316                         }
 317                         if (arguments != null) {
 318                                 int argumentLength = arguments.length;
 319                                 for (int i = 0; i < argumentLength; i++)
 320                                         arguments[i].traverse(visitor, scope);
 321                         }
 322                 }
 323                 visitor.endVisit(this, scope);
 324         }
 325 }