net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/TrueLiteral.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.codegen.Label;
  16 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  18 import net.sourceforge.phpdt.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
  27         constant = Constant.fromValue(true);}
  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.iconst_1();
  39         codeStream.recordPositionsFrom(pc, this.sourceStart);
  40 }
  41 public void generateOptimizedBoolean(BlockScope currentScope, CodeStream codeStream, Label trueLabel, Label falseLabel, boolean valueRequired) {
  42
  43         // trueLabel being not nil means that we will not fall through into the TRUE case
  44
  45         int pc = codeStream.position;
  46         // constant == true
  47         if (valueRequired) {
  48                 if (falseLabel == null) {
  49                         // implicit falling through the FALSE case
  50                         if (trueLabel != null) {
  51                                 codeStream.goto_(trueLabel);
  52                         }
  53                 }
  54         }
  55         codeStream.recordPositionsFrom(pc, this.sourceStart);
  56 }
  57 public TypeBinding literalType(BlockScope scope) {
  58         return BooleanBinding;
  59 }
  60 /**
  61  *
  62  */
  63 public char[] source() {
  64         return source;
  65 }
  66 public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
  67         visitor.visit(this, scope);
  68         visitor.endVisit(this, scope);
  69 }
  70 }