src/org/eclipse/jdt/internal/compiler/ast/ClassLiteralAccess.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.compiler.ast;
  12
  13 import org.eclipse.jdt.internal.compiler.ASTVisitor;
  14 import org.eclipse.jdt.internal.compiler.codegen.*;
  15 import org.eclipse.jdt.internal.compiler.flow.*;
  16 import org.eclipse.jdt.internal.compiler.lookup.*;
  17
  18 public class ClassLiteralAccess extends Expression {
  19
  20         public TypeReference type;
  21         public TypeBinding targetType;
  22         FieldBinding syntheticField;
  23
  24         public ClassLiteralAccess(int sourceEnd, TypeReference t) {
  25                 type = t;
  26                 this.sourceStart = t.sourceStart;
  27                 this.sourceEnd = sourceEnd;
  28         }
  29
  30         public FlowInfo analyseCode(
  31                 BlockScope currentScope,
  32                 FlowContext flowContext,
  33                 FlowInfo flowInfo) {
  34
  35                 // if reachable, request the addition of a synthetic field for caching the class descriptor
  36                 SourceTypeBinding sourceType =
  37                         currentScope.outerMostMethodScope().enclosingSourceType();
  38                 if (!(sourceType.isInterface()
  39                         // no field generated in interface case (would'nt verify) see 1FHHEZL
  40                         || sourceType.isBaseType())) {
  41                         syntheticField = sourceType.addSyntheticField(targetType, currentScope);
  42                 }
  43                 return flowInfo;
  44         }
  45
  46         /**
  47          * MessageSendDotClass code generation
  48          *
  49          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  50          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  51          * @param valueRequired boolean
  52          */
  53         public void generateCode(
  54                 BlockScope currentScope,
  55                 CodeStream codeStream,
  56                 boolean valueRequired) {
  57                 int pc = codeStream.position;
  58
  59                 // in interface case, no caching occurs, since cannot make a cache field for interface
  60                 if (valueRequired)
  61                         codeStream.generateClassLiteralAccessForType(type.resolvedType, syntheticField);
  62                 codeStream.recordPositionsFrom(pc, this.sourceStart);
  63         }
  64
  65         public StringBuffer printExpression(int indent, StringBuffer output) {
  66
  67                 return type.print(0, output).append(".class"); //$NON-NLS-1$
  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 this.resolvedType = scope.getJavaLangClass();
  83         }
  84
  85         public void traverse(
  86                 ASTVisitor visitor,
  87                 BlockScope blockScope) {
  88
  89                 if (visitor.visit(this, blockScope)) {
  90                         type.traverse(visitor, blockScope);
  91                 }
  92                 visitor.endVisit(this, blockScope);
  93         }
  94 }