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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.classfile.attribute.preverification;

import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.attribute.preverification.visitor.*;

/**
 * This {@link StackMapFrame} represents a "same locals 1 stack item frame" or a "same locals 1
 * stack item frame extended".
 *
 * @author Eric Lafortune
 */
public class SameOneFrame extends StackMapFrame {
  public VerificationType stackItem;

  /** Creates an uninitialized SameOneFrame. */
  public SameOneFrame() {}

  /** Creates a SameOneFrame with the given tag. */
  public SameOneFrame(int tag) {
    u2offsetDelta = tag - SAME_ONE_FRAME;
  }

  /** Creates a SameOneFrame with the given stack verification type. */
  public SameOneFrame(VerificationType stackItem) {
    this.stackItem = stackItem;
  }

  /** Applies the given verification type visitor to the stack item. */
  public void stackItemAccept(
      Clazz clazz,
      Method method,
      CodeAttribute codeAttribute,
      int offset,
      VerificationTypeVisitor verificationTypeVisitor) {
    stackItem.accept(clazz, method, codeAttribute, offset, verificationTypeVisitor);
  }

  // Implementations for StackMapFrame.

  public int getTag() {
    return u2offsetDelta < 64 ? SAME_ONE_FRAME + u2offsetDelta : SAME_ONE_FRAME_EXTENDED;
  }

  public void accept(
      Clazz clazz,
      Method method,
      CodeAttribute codeAttribute,
      int offset,
      StackMapFrameVisitor stackMapFrameVisitor) {
    stackMapFrameVisitor.visitSameOneFrame(clazz, method, codeAttribute, offset, this);
  }

  // Implementations for Object.

  public boolean equals(Object object) {
    if (!super.equals(object)) {
      return false;
    }

    SameOneFrame other = (SameOneFrame) object;

    return this.u2offsetDelta == other.u2offsetDelta && this.stackItem.equals(other.stackItem);
  }

  public int hashCode() {
    return super.hashCode() ^ stackItem.hashCode();
  }

  public String toString() {
    return super.toString() + "Var: ..., Stack: [" + stackItem.toString() + "]";
  }
}