net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/ThisReference.java

   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.lookup.*;
  16
  17 public class ThisReference extends Reference {
  18
  19         public static final ThisReference ThisImplicit = new ThisReference();
  20
  21 /**
  22  * ThisReference constructor comment.
  23  */
  24 public ThisReference() {
  25         super();
  26 }
  27 public ThisReference(int s, int sourceEnd) {
  28         this();
  29         this.sourceStart = s ;
  30         this.sourceEnd = sourceEnd;
  31 }
  32 protected boolean checkAccess(MethodScope methodScope) {
  33         // this/super cannot be used in constructor call
  34         if (methodScope.isConstructorCall) {
  35                 methodScope.problemReporter().fieldsOrThisBeforeConstructorInvocation(this);
  36                 return false;
  37         }
  38
  39         // static may not refer to this/super
  40         if (methodScope.isStatic) {
  41                 methodScope.problemReporter().errorThisSuperInStatic(this);
  42                 return false;
  43         }
  44         return true;
  45 }
  46 public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
  47         int pc = codeStream.position;
  48         if (valueRequired)
  49                 codeStream.aload_0();
  50         codeStream.recordPositionsFrom(pc, this.sourceStart);
  51 }
  52 public boolean isThis() {
  53
  54         return true ;
  55 }
  56 public TypeBinding resolveType(BlockScope scope) {
  57         // implicit this
  58         constant = NotAConstant;
  59         if (this != ThisImplicit && !checkAccess(scope.methodScope()))
  60                 return null;
  61         return scope.enclosingSourceType();
  62 }
  63 public String toStringExpression(){
  64
  65         if (this == ThisImplicit) return "" ; //$NON-NLS-1$
  66         return "this"; //$NON-NLS-1$
  67 }
  68 public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope blockScope) {
  69         visitor.visit(this, blockScope);
  70         visitor.endVisit(this, blockScope);
  71 }
  72 }