| /******************************************************************************* |
| * Copyright (c) 2000, 2013 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * 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); |
| } |
| |
| @Override |
| 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 |
| */ |
| @Override |
| 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); |
| } |
| @Override |
| public TypeBinding literalType(BlockScope scope) { |
| return TypeBinding.NULL; |
| } |
| |
| @Override |
| public int nullStatus(FlowInfo flowInfo, FlowContext flowContext) { |
| return FlowInfo.NULL; |
| } |
| |
| @Override |
| public Object reusableJSRTarget() { |
| return TypeBinding.NULL; |
| } |
| |
| @Override |
| public char[] source() { |
| return source; |
| } |
| |
| @Override |
| public void traverse(ASTVisitor visitor, BlockScope scope) { |
| visitor.visit(this, scope); |
| visitor.endVisit(this, scope); |
| } |
| } |