net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/ClassLiteralAccess.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.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.ArrayBinding;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.FieldBinding;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.SourceTypeBinding;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  22
  23 public class ClassLiteralAccess extends Expression {
  24
  25         public TypeReference type;
  26         public TypeBinding targetType;
  27         FieldBinding syntheticField;
  28
  29         public ClassLiteralAccess(int sourceEnd, TypeReference t) {
  30                 type = t;
  31                 this.sourceStart = t.sourceStart;
  32                 this.sourceEnd = sourceEnd;
  33         }
  34
  35         public FlowInfo analyseCode(
  36                 BlockScope currentScope,
  37                 FlowContext flowContext,
  38                 FlowInfo flowInfo) {
  39
  40                 // if reachable, request the addition of a synthetic field for caching the class descriptor
  41                 SourceTypeBinding sourceType =
  42                         currentScope.outerMostMethodScope().enclosingSourceType();
  43                 if (!(sourceType.isInterface()
  44                         // no field generated in interface case (would'nt verify) see 1FHHEZL
  45                         || sourceType.isBaseType())) {
  46                         syntheticField = sourceType.addSyntheticField(targetType, currentScope);
  47                 }
  48                 return flowInfo;
  49         }
  50
  51         /**
  52          * MessageSendDotClass code generation
  53          *
  54          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  55          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  56          * @param valueRequired boolean
  57          */
  58         public void generateCode(
  59                 BlockScope currentScope,
  60                 CodeStream codeStream,
  61                 boolean valueRequired) {
  62                 int pc = codeStream.position;
  63
  64                 // in interface case, no caching occurs, since cannot make a cache field for interface
  65                 if (valueRequired)
  66                         codeStream.generateClassLiteralAccessForType(type.binding, syntheticField);
  67                 codeStream.recordPositionsFrom(pc, this.sourceStart);
  68         }
  69
  70         public TypeBinding resolveType(BlockScope scope) {
  71
  72                 constant = NotAConstant;
  73                 if ((targetType = type.resolveType(scope)) == null)
  74                         return null;
  75
  76                 if (targetType.isArrayType()
  77                         && ((ArrayBinding) targetType).leafComponentType == VoidBinding) {
  78                         scope.problemReporter().cannotAllocateVoidArray(this);
  79                         return null;
  80                 }
  81
  82                 return scope.getJavaLangClass();
  83         }
  84
  85         public String toStringExpression() {
  86
  87                 String s = ""; //$NON-NLS-1$
  88                 s = s + type.toString(0) + ".class"; //$NON-NLS-1$
  89                 return s;
  90         }
  91
  92         public void traverse(
  93                 IAbstractSyntaxTreeVisitor visitor,
  94                 BlockScope blockScope) {
  95
  96                 if (visitor.visit(this, blockScope)) {
  97                         type.traverse(visitor, blockScope);
  98                 }
  99                 visitor.endVisit(this, blockScope);
 100         }
 101 }