proguard.classfile.attribute.preverification.MoreZeroFrame Maven / Gradle / Ivy

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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 an "append frame".
 *
 * @author Eric Lafortune
 */
public class MoreZeroFrame extends StackMapFrame {
  public int additionalVariablesCount;
  public VerificationType[] additionalVariables;

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

  /** Creates a MoreZeroFrame with the given tag. */
  public MoreZeroFrame(int tag) {
    additionalVariablesCount = tag + 1 - MORE_ZERO_FRAME;
  }

  /** Creates a MoreZeroFrame with the given additional variables. */
  public MoreZeroFrame(VerificationType[] additionalVariables) {
    this(additionalVariables.length, additionalVariables);
  }

  /** Creates a MoreZeroFrame with the given additional variables. */
  public MoreZeroFrame(int additionalVariablesCount, VerificationType[] additionalVariables) {
    this.additionalVariablesCount = additionalVariablesCount;
    this.additionalVariables = additionalVariables;
  }

  /** Applies the given verification type visitor to all variables. */
  public void additionalVariablesAccept(
      Clazz clazz,
      Method method,
      CodeAttribute codeAttribute,
      int offset,
      VerificationTypeVisitor verificationTypeVisitor) {
    for (int index = 0; index < additionalVariablesCount; index++) {
      additionalVariables[index].accept(
          clazz, method, codeAttribute, offset, verificationTypeVisitor);
    }
  }

  // Implementations for StackMapFrame.

  public int getTag() {
    return MORE_ZERO_FRAME + additionalVariablesCount - 1;
  }

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

  // Implementations for Object.

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

    MoreZeroFrame other = (MoreZeroFrame) object;

    if (this.u2offsetDelta != other.u2offsetDelta
        || this.additionalVariablesCount != other.additionalVariablesCount) {
      return false;
    }

    for (int index = 0; index < additionalVariablesCount; index++) {
      VerificationType thisType = this.additionalVariables[index];
      VerificationType otherType = other.additionalVariables[index];

      if (!thisType.equals(otherType)) {
        return false;
      }
    }

    return true;
  }

  public int hashCode() {
    int hashCode = super.hashCode();

    for (int index = 0; index < additionalVariablesCount; index++) {
      hashCode ^= additionalVariables[index].hashCode();
    }

    return hashCode;
  }

  public String toString() {
    StringBuffer buffer = new StringBuffer(super.toString()).append("Var: ...");

    for (int index = 0; index < additionalVariablesCount; index++) {
      buffer = buffer.append('[').append(additionalVariables[index].toString()).append(']');
    }

    buffer.append(", Stack: (empty)");

    return buffer.toString();
  }
}