org.eclipse.jdt.internal.compiler.ast.NullLiteral Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contribution for
* bug 383368 - [compiler][null] syntactic null analysis for field references
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.FlowContext;
import org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.*;
public class NullLiteral extends MagicLiteral {
static final char[] source = {'n' , 'u' , 'l' , 'l'};
public NullLiteral(int s , int e) {
super(s,e);
}
public void computeConstant() {
this.constant = Constant.NotAConstant;
}
/**
* Code generation for the null literal
*
* @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
* @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
* @param valueRequired boolean
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
if (valueRequired) {
codeStream.aconst_null();
codeStream.generateImplicitConversion(this.implicitConversion);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
public TypeBinding literalType(BlockScope scope) {
return TypeBinding.NULL;
}
public int nullStatus(FlowInfo flowInfo, FlowContext flowContext) {
return FlowInfo.NULL;
}
public Object reusableJSRTarget() {
return TypeBinding.NULL;
}
public char[] source() {
return source;
}
public void traverse(ASTVisitor visitor, BlockScope scope) {
visitor.visit(this, scope);
visitor.endVisit(this, scope);
}
}