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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.jvm.util;

import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import proguard.classfile.instruction.Instruction;

/**
 * Util for operations involving {@link Instruction}.
 *
 * @author Carlo Alberto Pozzoli
 */
public class InstructionClassifier {

  private static final Set returnInstructions =
      Stream.of(
              Instruction.OP_RETURN,
              Instruction.OP_IRETURN,
              Instruction.OP_LRETURN,
              Instruction.OP_FRETURN,
              Instruction.OP_DRETURN,
              Instruction.OP_ARETURN)
          .collect(Collectors.toSet());

  private static final Set invokeInstructions =
      Stream.of(
              Instruction.OP_INVOKEDYNAMIC,
              Instruction.OP_INVOKESTATIC,
              Instruction.OP_INVOKESPECIAL,
              Instruction.OP_INVOKEVIRTUAL,
              Instruction.OP_INVOKEINTERFACE)
          .collect(Collectors.toSet());

  private static final Set longShiftInstructions =
      Stream.of(Instruction.OP_LSHL, Instruction.OP_LSHR, Instruction.OP_LUSHR)
          .collect(Collectors.toSet());

  public static boolean isReturn(byte opcode) {
    return returnInstructions.contains(opcode);
  }

  /** Checks if the opcode is nonvoid return. */
  public static boolean isTypedReturn(byte opcode) {
    return returnInstructions.contains(opcode) && opcode != Instruction.OP_RETURN;
  }

  public static boolean isInvoke(byte opcode) {
    return invokeInstructions.contains(opcode);
  }

  public static boolean isLongShift(byte opcode) {
    return longShiftInstructions.contains(opcode);
  }
}