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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.*;
import proguard.classfile.attribute.preverification.visitor.StackMapFrameVisitor;
import proguard.classfile.attribute.visitor.AttributeVisitor;

/**
 * This {@link Attribute} represents a stack map attribute.
 *
 * @author Eric Lafortune
 */
public class StackMapAttribute extends Attribute {
  public int u2stackMapFramesCount;
  public FullFrame[] stackMapFrames;

  /** Creates an uninitialized ExceptionsAttribute. */
  public StackMapAttribute() {}

  /** Creates a StackMapTableAttribute with the given stack map frames. */
  public StackMapAttribute(FullFrame[] stackMapFrames) {
    this(stackMapFrames.length, stackMapFrames);
  }

  /** Creates a StackMapTableAttribute with the given stack map frames. */
  public StackMapAttribute(int stackMapFramesCount, FullFrame[] stackMapFrames) {
    this.u2stackMapFramesCount = stackMapFramesCount;
    this.stackMapFrames = stackMapFrames;
  }

  // Implementations for Attribute.

  public void accept(
      Clazz clazz, Method method, CodeAttribute codeAttribute, AttributeVisitor attributeVisitor) {
    attributeVisitor.visitStackMapAttribute(clazz, method, codeAttribute, this);
  }

  /** Applies the given stack map frame visitor to all stack map frames. */
  public void stackMapFramesAccept(
      Clazz clazz,
      Method method,
      CodeAttribute codeAttribute,
      StackMapFrameVisitor stackMapFrameVisitor) {
    for (int index = 0; index < u2stackMapFramesCount; index++) {
      FullFrame stackMapFrame = stackMapFrames[index];

      // We don't need double dispatching here, since there is only one
      // type of StackMapFrame.
      stackMapFrameVisitor.visitFullFrame(
          clazz, method, codeAttribute, stackMapFrame.getOffsetDelta(), stackMapFrame);
    }
  }
}