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

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 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 net.sourceforge.phpdt.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  15 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  17
  18 public class FalseLiteral extends MagicLiteral {
  19         static final char[] source = { 'f', 'a', 'l', 's', 'e' };
  20
  21         public FalseLiteral(int s, int e) {
  22                 super(s, e);
  23         }
  24
  25         public void computeConstant() {
  26
  27                 constant = Constant.fromValue(false);
  28         }
  29
  30         /**
  31          * Code generation for false literal
  32          *
  33          * @param currentScope
  34          *            net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
  35          * @param codeStream
  36          *            net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
  37          * @param valueRequired
  38          *            boolean
  39          */
  40         // public void generateCode(BlockScope currentScope, CodeStream codeStream,
  41         // boolean valueRequired) {
  42         // int pc = codeStream.position;
  43         // if (valueRequired)
  44         // codeStream.iconst_0();
  45         // codeStream.recordPositionsFrom(pc, this.sourceStart);
  46         // }
  47         // public void generateOptimizedBoolean(BlockScope currentScope, CodeStream
  48         // codeStream, Label trueLabel, Label falseLabel, boolean valueRequired) {
  49         //
  50         // // falseLabel being not nil means that we will not fall through into the
  51         // FALSE case
  52         //
  53         // int pc = codeStream.position;
  54         // if (valueRequired) {
  55         // if (falseLabel != null) {
  56         // // implicit falling through the TRUE case
  57         // if (trueLabel == null) {
  58         // codeStream.goto_(falseLabel);
  59         // }
  60         // }
  61         // }
  62         // codeStream.recordPositionsFrom(pc, this.sourceStart);
  63         // }
  64         public TypeBinding literalType(BlockScope scope) {
  65                 return BooleanBinding;
  66         }
  67
  68         /**
  69          *
  70          */
  71         public char[] source() {
  72                 return source;
  73         }
  74
  75         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
  76                 visitor.visit(this, scope);
  77                 visitor.endVisit(this, scope);
  78         }
  79 }