KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > eclipse > jdt > internal > compiler > ast > FalseLiteral


1 /*******************************************************************************
2  * Copyright (c) 2000, 2006 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-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.BranchLabel;
15 import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
16 import org.eclipse.jdt.internal.compiler.impl.BooleanConstant;
17 import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
18 import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
19
20 public class FalseLiteral extends MagicLiteral {
21     static final char[] source = {'f', 'a', 'l', 's', 'e'};
22 public FalseLiteral(int s , int e) {
23     super(s,e);
24 }
25 public void computeConstant() {
26     constant = BooleanConstant.fromValue(false);
27 }
28 /**
29  * Code generation for false 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(this.constant, this.implicitConversion);
39     }
40     codeStream.recordPositionsFrom(pc, this.sourceStart);
41 }
42 public void generateOptimizedBoolean(BlockScope currentScope, CodeStream codeStream, BranchLabel trueLabel, BranchLabel falseLabel, boolean valueRequired) {
43
44     // falseLabel being not nil means that we will not fall through into the FALSE case
45
46     int pc = codeStream.position;
47     if (valueRequired) {
48         if (falseLabel != null) {
49             // implicit falling through the TRUE case
50 if (trueLabel == null) {
51                 codeStream.goto_(falseLabel);
52             }
53         }
54     }
55     codeStream.recordPositionsFrom(pc, this.sourceStart);
56 }
57 public TypeBinding literalType(BlockScope scope) {
58     return TypeBinding.BOOLEAN;
59 }
60 /**
61  *
62  */
63 public char[] source() {
64     return source;
65 }
66 public void traverse(ASTVisitor visitor, BlockScope scope) {
67     visitor.visit(this, scope);
68     visitor.endVisit(this, scope);
69 }
70 }
71
Popular Tags