cn.taketoday.bytecode.tree.JumpInsnNode Maven / Gradle / Ivy

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/*
 * Original Author -> Harry Yang ([email protected]) https://taketoday.cn
 * Copyright © TODAY & 2017 - 2022 All Rights Reserved.
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/]
 */
package cn.taketoday.bytecode.tree;

import java.util.Map;

import cn.taketoday.bytecode.MethodVisitor;

/**
 * A node that represents a jump instruction. A jump instruction is an instruction that may jump to
 * another instruction.
 *
 * @author Eric Bruneton
 */
public class JumpInsnNode extends AbstractInsnNode {

  /**
   * The operand of this instruction. This operand is a label that designates the instruction to
   * which this instruction may jump.
   */
  public LabelNode label;

  /**
   * Constructs a new {@link JumpInsnNode}.
   *
   * @param opcode the opcode of the type instruction to be constructed. This opcode must be IFEQ,
   * IFNE, IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ, IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT,
   * IF_ICMPLE, IF_ACMPEQ, IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.
   * @param label the operand of the instruction to be constructed. This operand is a label that
   * designates the instruction to which the jump instruction may jump.
   */
  public JumpInsnNode(final int opcode, final LabelNode label) {
    super(opcode);
    this.label = label;
  }

  /**
   * Sets the opcode of this instruction.
   *
   * @param opcode the new instruction opcode. This opcode must be IFEQ, IFNE, IFLT, IFGE, IFGT,
   * IFLE, IF_ICMPEQ, IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ,
   * IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.
   */
  public void setOpcode(final int opcode) {
    this.opcode = opcode;
  }

  @Override
  public int getType() {
    return JUMP_INSN;
  }

  @Override
  public void accept(final MethodVisitor methodVisitor) {
    methodVisitor.visitJumpInsn(opcode, label.getLabel());
    acceptAnnotations(methodVisitor);
  }

  @Override
  public AbstractInsnNode clone(final Map clonedLabels) {
    return new JumpInsnNode(opcode, clone(label, clonedLabels)).cloneAnnotations(this);
  }
}