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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 AllocationExpression
  19         extends Expression
  20         implements InvocationSite {
  21
  22         public TypeReference type;
  23         public Expression[] arguments;
  24         public MethodBinding binding;
  25
  26         MethodBinding syntheticAccessor;
  27
  28         public AllocationExpression() {
  29                 super();
  30         }
  31
  32         public FlowInfo analyseCode(
  33                 BlockScope currentScope,
  34                 FlowContext flowContext,
  35                 FlowInfo flowInfo) {
  36
  37                 // must verify that exceptions potentially thrown by this expression are caught in the method
  38
  39                 // process arguments
  40                 if (arguments != null) {
  41                         for (int i = 0, count = arguments.length; i < count; i++) {
  42                                 flowInfo =
  43                                         arguments[i]
  44                                                 .analyseCode(currentScope, flowContext, flowInfo)
  45                                                 .unconditionalInits();
  46                         }
  47                 }
  48                 // record some dependency information for exception types
  49                 ReferenceBinding[] thrownExceptions;
  50                 if (((thrownExceptions = binding.thrownExceptions).length) != 0) {
  51                         // check exception handling
  52                         flowContext.checkExceptionHandlers(
  53                                 thrownExceptions,
  54                                 this,
  55                                 flowInfo,
  56                                 currentScope);
  57                 }
  58                 manageEnclosingInstanceAccessIfNecessary(currentScope);
  59                 manageSyntheticAccessIfNecessary(currentScope);
  60                 return flowInfo;
  61         }
  62
  63         public Expression enclosingInstance() {
  64                 return null;
  65         }
  66
  67         public void generateCode(
  68                 BlockScope currentScope,
  69                 CodeStream codeStream,
  70                 boolean valueRequired) {
  71
  72                 int pc = codeStream.position;
  73                 ReferenceBinding allocatedType = binding.declaringClass;
  74
  75                 codeStream.new_(allocatedType);
  76                 if (valueRequired) {
  77                         codeStream.dup();
  78                 }
  79                 // better highlight for allocation: display the type individually
  80                 codeStream.recordPositionsFrom(pc, type.sourceStart);
  81
  82                 // handling innerclass instance allocation
  83                 if (allocatedType.isNestedType()) {
  84                         codeStream.generateSyntheticArgumentValues(
  85                                 currentScope,
  86                                 allocatedType,
  87                                 enclosingInstance(),
  88                                 this);
  89                 }
  90                 // generate the arguments for constructor
  91                 if (arguments != null) {
  92                         for (int i = 0, count = arguments.length; i < count; i++) {
  93                                 arguments[i].generateCode(currentScope, codeStream, true);
  94                         }
  95                 }
  96                 // invoke constructor
  97                 if (syntheticAccessor == null) {
  98                         codeStream.invokespecial(binding);
  99                 } else {
 100                         // synthetic accessor got some extra arguments appended to its signature, which need values
 101                         for (int i = 0,
 102                                 max = syntheticAccessor.parameters.length - binding.parameters.length;
 103                                 i < max;
 104                                 i++) {
 105                                 codeStream.aconst_null();
 106                         }
 107                         codeStream.invokespecial(syntheticAccessor);
 108                 }
 109                 codeStream.recordPositionsFrom(pc, this.sourceStart);
 110         }
 111
 112         public boolean isSuperAccess() {
 113
 114                 return false;
 115         }
 116
 117         public boolean isTypeAccess() {
 118
 119                 return true;
 120         }
 121
 122         /* Inner emulation consists in either recording a dependency
 123          * link only, or performing one level of propagation.
 124          *
 125          * Dependency mechanism is used whenever dealing with source target
 126          * types, since by the time we reach them, we might not yet know their
 127          * exact need.
 128          */
 129         public void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope) {
 130
 131                 ReferenceBinding allocatedType;
 132
 133                 // perform some emulation work in case there is some and we are inside a local type only
 134                 if ((allocatedType = binding.declaringClass).isNestedType()
 135                         && currentScope.enclosingSourceType().isLocalType()) {
 136
 137                         if (allocatedType.isLocalType()) {
 138                                 ((LocalTypeBinding) allocatedType).addInnerEmulationDependent(
 139                                         currentScope,
 140                                         false,
 141                                         false);
 142                                 // request cascade of accesses
 143                         } else {
 144                                 // locally propagate, since we already now the desired shape for sure
 145                                 currentScope.propagateInnerEmulation(allocatedType, false, false);
 146                                 // request cascade of accesses
 147                         }
 148                 }
 149         }
 150
 151         public void manageSyntheticAccessIfNecessary(BlockScope currentScope) {
 152
 153                 if (binding.isPrivate()
 154                         && (currentScope.enclosingSourceType() != binding.declaringClass)) {
 155
 156                         if (currentScope
 157                                 .environment()
 158                                 .options
 159                                 .isPrivateConstructorAccessChangingVisibility) {
 160                                 binding.tagForClearingPrivateModifier();
 161                                 // constructor will not be dumped as private, no emulation required thus
 162                         } else {
 163                                 syntheticAccessor =
 164                                         ((SourceTypeBinding) binding.declaringClass).addSyntheticMethod(binding);
 165                                 currentScope.problemReporter().needToEmulateMethodAccess(binding, this);
 166                         }
 167                 }
 168         }
 169
 170         public TypeBinding resolveType(BlockScope scope) {
 171
 172                 // Propagate the type checking to the arguments, and check if the constructor is defined.
 173                 constant = NotAConstant;
 174                 TypeBinding typeBinding = type.resolveType(scope);
 175                 // will check for null after args are resolved
 176
 177                 // buffering the arguments' types
 178                 TypeBinding[] argumentTypes = NoParameters;
 179                 if (arguments != null) {
 180                         boolean argHasError = false;
 181                         int length = arguments.length;
 182                         argumentTypes = new TypeBinding[length];
 183                         for (int i = 0; i < length; i++)
 184                                 if ((argumentTypes[i] = arguments[i].resolveType(scope)) == null)
 185                                         argHasError = true;
 186                         if (argHasError)
 187                                 return typeBinding;
 188                 }
 189                 if (typeBinding == null)
 190                         return null;
 191
 192                 if (!typeBinding.canBeInstantiated()) {
 193                         scope.problemReporter().cannotInstantiate(type, typeBinding);
 194                         return typeBinding;
 195                 }
 196                 ReferenceBinding allocatedType = (ReferenceBinding) typeBinding;
 197                 if (!(binding = scope.getConstructor(allocatedType, argumentTypes, this))
 198                         .isValidBinding()) {
 199                         if (binding.declaringClass == null)
 200                                 binding.declaringClass = allocatedType;
 201                         scope.problemReporter().invalidConstructor(this, binding);
 202                         return typeBinding;
 203                 }
 204                 if (isMethodUseDeprecated(binding, scope))
 205                         scope.problemReporter().deprecatedMethod(binding, this);
 206
 207                 if (arguments != null)
 208                         for (int i = 0; i < arguments.length; i++)
 209                                 arguments[i].implicitWidening(binding.parameters[i], argumentTypes[i]);
 210                 return allocatedType;
 211         }
 212
 213         public void setActualReceiverType(ReferenceBinding receiverType) {
 214                 // ignored
 215         }
 216
 217         public void setDepth(int i) {
 218                 // ignored
 219         }
 220
 221         public void setFieldIndex(int i) {
 222                 // ignored
 223         }
 224
 225         public String toStringExpression() {
 226
 227                 String s = "new " + type.toString(0); //$NON-NLS-1$
 228                 if (arguments == null)
 229                         s = s + "()"; //$NON-NLS-1$
 230                 else {
 231                         s = s + "("; //$NON-NLS-1$
 232                         for (int i = 0; i < arguments.length; i++) {
 233                                 s = s + arguments[i].toStringExpression();
 234                                 if (i == (arguments.length - 1))
 235                                         s = s + ")"; //$NON-NLS-1$
 236                                 else
 237                                         s = s + ", "; //$NON-NLS-1$
 238                         }
 239                 }
 240                 return s;
 241         }
 242
 243         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 244
 245                 if (visitor.visit(this, scope)) {
 246                         int argumentsLength;
 247                         type.traverse(visitor, scope);
 248                         if (arguments != null) {
 249                                 argumentsLength = arguments.length;
 250                                 for (int i = 0; i < argumentsLength; i++)
 251                                         arguments[i].traverse(visitor, scope);
 252                         }
 253                 }
 254                 visitor.endVisit(this, scope);
 255         }
 256 }