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

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/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2022 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.analysis.cpa.defaults;

import java.time.Duration;
import java.time.Instant;
import proguard.analysis.cpa.interfaces.AbstractState;
import proguard.analysis.cpa.interfaces.ConfigurableProgramAnalysis;
import proguard.analysis.cpa.interfaces.ReachedSet;

/**
 * This {@link CpaRun} wraps another {@code InputCpaRunT} and allows a following {@code CpaT} to be
 * constructed using the output of the former run.
 *
 * @author Dmitry Ivanov
 */
public abstract class SequentialCpaRun<
        CpaT extends ConfigurableProgramAnalysis,
        AbstractStateT extends AbstractState,
        InputCpaRunT extends CpaRun>
    extends CpaRun {

  protected final InputCpaRunT inputCpaRun;
  protected ReachedSet inputReachedSet;
  protected ReachedSet outputReachedSet;

  /**
   * Create a CPA run which accepts the reached set of another CPA run.
   *
   * @param inputCpaRun the inner CPA run
   */
  public SequentialCpaRun(InputCpaRunT inputCpaRun) {
    this.inputCpaRun = inputCpaRun;
  }

  // implementations for CpaRun

  @Override
  public ReachedSet execute() {
    // Run the input CPA and measure it's time
    Instant startTime = Instant.now();
    this.inputReachedSet = this.inputCpaRun.execute();
    Duration inputCpaDuration = Duration.between(startTime, Instant.now());

    // If the abort operator is reconfigurable, pass the duration of the input CPA to it
    if (abortOperator instanceof SequentialCpaRun.PreviousRunDurationReceiver) {
      ((PreviousRunDurationReceiver) abortOperator).setPreviousCpaRunDuration(inputCpaDuration);
    }

    // Run the second CPA
    this.outputReachedSet = super.execute();

    return this.outputReachedSet;
  }

  public ReachedSet getOutputReachedSet() {
    return outputReachedSet == null ? outputReachedSet = execute() : outputReachedSet;
  }

  public InputCpaRunT getInputCpaRun() {
    return inputCpaRun;
  }

  /**
   * Interface that can be implemented by the abort operator of the second CPA. If implemented, the
   * {@link SequentialCpaRun} would provide it with information about the duration of the first CPA
   * runtime duration.
   */
  public interface PreviousRunDurationReceiver {
    /**
     * @param duration The duration of the first CPA run in the {@link SequentialCpaRun}
     */
    void setPreviousCpaRunDuration(Duration duration);
  }
}