src/org/eclipse/jdt/internal/compiler/ast/TrueLiteral.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.CodeStream;
  15 import org.eclipse.jdt.internal.compiler.codegen.Label;
  16 import org.eclipse.jdt.internal.compiler.impl.Constant;
  17 import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
  18 import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
  19
  20 public class TrueLiteral extends MagicLiteral {
  21         static final char[] source = {'t' , 'r' , 'u' , 'e'};
  22 public TrueLiteral(int s , int e) {
  23         super(s,e);
  24 }
  25 public void computeConstant() {
  26         this.constant = Constant.fromValue(true);
  27 }
  28 /**
  29  * Code generation for the true literal
  30  *
  31  * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  32  * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  33  * @param valueRequired boolean
  34  */
  35 public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
  36         int pc = codeStream.position;
  37         if (valueRequired) {
  38                 codeStream.generateConstant(constant, implicitConversion);
  39         }
  40         codeStream.recordPositionsFrom(pc, this.sourceStart);
  41 }
  42 public void generateOptimizedBoolean(BlockScope currentScope, CodeStream codeStream, Label trueLabel, Label falseLabel, boolean valueRequired) {
  43
  44         // trueLabel being not nil means that we will not fall through into the TRUE case
  45
  46         int pc = codeStream.position;
  47         // constant == true
  48         if (valueRequired) {
  49                 if (falseLabel == null) {
  50                         // implicit falling through the FALSE case
  51                         if (trueLabel != null) {
  52                                 codeStream.goto_(trueLabel);
  53                         }
  54                 }
  55         }
  56         codeStream.recordPositionsFrom(pc, this.sourceStart);
  57 }
  58 public TypeBinding literalType(BlockScope scope) {
  59         return BooleanBinding;
  60 }
  61 /**
  62  *
  63  */
  64 public char[] source() {
  65         return source;
  66 }
  67 public void traverse(ASTVisitor visitor, BlockScope scope) {
  68         visitor.visit(this, scope);
  69         visitor.endVisit(this, scope);
  70 }
  71 }