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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) 2002-2022 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.interfaces;

import java.util.List;
import proguard.classfile.Signature;

/**
 * A node for {@link proguard.analysis.cpa.defaults.Cfa} parametrized by its edges {@code CfaEdgeT}.
 * A CFA node corresponds to a program point before the instruction at a specific offset.
 *
 * @author Dmitry Ivanov
 */
public interface CfaNode {

  int RETURN_EXIT_NODE_OFFSET = -1;
  int EXCEPTION_EXIT_NODE_OFFSET = -2;

  /** Returns a list of leaving edges. */
  List getLeavingEdges();

  /** Returns a list of entering edges. */
  List getEnteringEdges();

  /** Checks whether the node is a function entry. */
  boolean isEntryNode();

  /** Checks whether the node is a function exit. */
  boolean isExitNode();

  /** Returns the function signature it belongs to. */
  SignatureT getSignature();

  /** Returns the instruction offset. */
  int getOffset();

  /**
   * Returns true if the node is the return location of the function (offset == {@link
   * CfaNode#RETURN_EXIT_NODE_OFFSET}).
   */
  default boolean isReturnExitNode() {
    return getOffset() == RETURN_EXIT_NODE_OFFSET;
  }

  /**
   * Returns true if the node is the return location of the function (offset == {@link
   * CfaNode#EXCEPTION_EXIT_NODE_OFFSET}).
   */
  default boolean isExceptionExitNode() {
    return getOffset() == EXCEPTION_EXIT_NODE_OFFSET;
  }

  /** Returns true if the location of the node is unknown. */
  default boolean isUnknownNode() {
    return false;
  }
}