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A Java Optimization Framework

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package soot.toDex.instructions;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 1997 - 2018 Raja Vallée-Rai and others
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.BitSet;

import org.jf.dexlib2.Opcode;
import org.jf.dexlib2.builder.BuilderInstruction;
import org.jf.dexlib2.builder.instruction.BuilderInstruction32x;

import soot.toDex.LabelAssigner;
import soot.toDex.Register;

/**
 * The "32x" instruction format: It needs three 16-bit code units, has two registers and is used for general purposes (hence
 * the "x").

 * 

 * It is used by the opcodes "move/16", "move-wide/16" and "move-object/16".
 */
public class Insn32x extends AbstractInsn implements TwoRegInsn {

  public Insn32x(Opcode opc, Register regA, Register regB) {
    super(opc);
    regs.add(regA);
    regs.add(regB);
  }

  public Register getRegA() {
    return regs.get(REG_A_IDX);
  }

  public Register getRegB() {
    return regs.get(REG_B_IDX);
  }

  @Override
  protected BuilderInstruction getRealInsn0(LabelAssigner assigner) {
    return new BuilderInstruction32x(opc, getRegA().getNumber(), getRegB().getNumber());
  }

  @Override
  public BitSet getIncompatibleRegs() {
    BitSet incompatRegs = new BitSet(2);
    if (!getRegA().fitsUnconstrained()) {
      incompatRegs.set(REG_A_IDX);
    }
    if (!getRegB().fitsUnconstrained()) {
      incompatRegs.set(REG_B_IDX);
    }
    return incompatRegs;
  }
}