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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.editor;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.BootstrapMethodInfoVisitor;

/**
 * This {@link BootstrapMethodInfoVisitor} adds all bootstrap methods that it visits to the given
 * target bootstrap methods attribute.
 */
public class BootstrapMethodInfoAdder implements BootstrapMethodInfoVisitor {
  private final ConstantAdder constantAdder;
  private final BootstrapMethodsAttributeEditor bootstrapMethodsAttributeEditor;

  private int bootstrapMethodIndex;

  /**
   * Creates a new BootstrapMethodInfoAdder that will copy bootstrap methods into the given
   * bootstrap methods attribute.
   */
  public BootstrapMethodInfoAdder(
      ProgramClass targetClass, BootstrapMethodsAttribute targetBootstrapMethodsAttribute) {
    this.constantAdder = new ConstantAdder(targetClass);
    this.bootstrapMethodsAttributeEditor =
        new BootstrapMethodsAttributeEditor(targetBootstrapMethodsAttribute);
  }

  /** Returns the index of the most recently added bootstrap method. */
  public int getBootstrapMethodIndex() {
    return bootstrapMethodIndex;
  }

  // Implementations for BootstrapMethodInfoVisitor.

  public void visitBootstrapMethodInfo(Clazz clazz, BootstrapMethodInfo bootstrapMethodInfo) {
    // Copy the method arguments.
    int methodArgumentCount = bootstrapMethodInfo.u2methodArgumentCount;
    int[] methodArguments = bootstrapMethodInfo.u2methodArguments;
    int[] newMethodArguments = new int[methodArgumentCount];

    for (int index = 0; index < methodArgumentCount; index++) {
      newMethodArguments[index] = constantAdder.addConstant(clazz, methodArguments[index]);
    }

    // Create a new bootstrap method.
    BootstrapMethodInfo newBootstrapMethodInfo =
        new BootstrapMethodInfo(
            constantAdder.addConstant(clazz, bootstrapMethodInfo.u2methodHandleIndex),
            methodArgumentCount,
            newMethodArguments);

    // Add it to the target.
    bootstrapMethodIndex =
        bootstrapMethodsAttributeEditor.addBootstrapMethodInfo(newBootstrapMethodInfo);
  }
}