/*
 * Copyright 2014 - 2020 Rafael Winterhalter
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.bytebuddy.implementation.bytecode.constant;

import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.StackSize;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

Represents a stack manipulation to load a null pointer onto the operand stack.
/** * Represents a stack manipulation to load a {@code null} pointer onto the operand stack. */
public enum NullConstant implements StackManipulation {
The singleton instance.
/** * The singleton instance. */
INSTANCE(StackSize.SINGLE);
The size impact of loading the null reference onto the operand stack.
/** * The size impact of loading the {@code null} reference onto the operand stack. */
private final Size size;
Creates a null constant.
Params:
  • size – The size of the constant on the operand stack.
/** * Creates a null constant. * * @param size The size of the constant on the operand stack. */
NullConstant(StackSize size) { this.size = size.toIncreasingSize(); }
{@inheritDoc}
/** * {@inheritDoc} */
public boolean isValid() { return true; }
{@inheritDoc}
/** * {@inheritDoc} */
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) { methodVisitor.visitInsn(Opcodes.ACONST_NULL); return size; } }