content: /*
   * Copyright (C) 2007 The Android Open Source Project
   *
   * 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 com.taobao.android.dx.dex.code.form;
  
  import com.taobao.android.dx.dex.code.CstInsn;
  import com.taobao.android.dx.dex.code.DalvInsn;
  import com.taobao.android.dx.dex.code.InsnFormat;
  import com.taobao.android.dx.rop.code.RegisterSpecList;
  import com.taobao.android.dx.rop.cst.Constant;
  import com.taobao.android.dx.rop.cst.CstFieldRef;
  import com.taobao.android.dx.rop.cst.CstType;
  import com.taobao.android.dx.util.AnnotatedOutput;
  import java.util.BitSet;
  
  /**
   * Instruction format {@code 22c}. See the instruction format spec
   * for details.
   */
  public final class Form22c extends InsnFormat {
      /** {@code non-null;} unique instance of this class */
      public static final InsnFormat THE_ONE = new Form22c();
  
      /**
       * Constructs an instance. This class is not publicly
       * instantiable. Use {@link #THE_ONE}.
       */
      private Form22c() {
          // This space intentionally left blank.
      }
  
      /** {@inheritDoc} */
      @Override
      public String insnArgString(DalvInsn insn) {
          RegisterSpecList regs = insn.getRegisters();
          return regs.get(0).regString() + ", " + regs.get(1).regString() +
              ", " + cstString(insn);
      }
  
      /** {@inheritDoc} */
      @Override
      public String insnCommentString(DalvInsn insn, boolean noteIndices) {
          if (noteIndices) {
              return cstComment(insn);
          } else {
              return "";
          }
      }
  
      /** {@inheritDoc} */
      @Override
      public int codeSize() {
          return 2;
      }
  
      /** {@inheritDoc} */
      @Override
      public boolean isCompatible(DalvInsn insn) {
          RegisterSpecList regs = insn.getRegisters();
          if (!((insn instanceof CstInsn) &&
                (regs.size() == 2) &&
                unsignedFitsInNibble(regs.get(0).getReg()) &&
                unsignedFitsInNibble(regs.get(1).getReg()))) {
              return false;
          }
  
          CstInsn ci = (CstInsn) insn;
          int cpi = ci.getIndex();
  
          if (! unsignedFitsInShort(cpi)) {
              return false;
          }
  
          Constant cst = ci.getConstant();
          return (cst instanceof CstType) ||
              (cst instanceof CstFieldRef);
      }
  
      /** {@inheritDoc} */
      @Override
      public BitSet compatibleRegs(DalvInsn insn) {
          RegisterSpecList regs = insn.getRegisters();
          BitSet bits = new BitSet(2);
  
          bits.set(0, unsignedFitsInNibble(regs.get(0).getReg()));
          bits.set(1, unsignedFitsInNibble(regs.get(1).getReg()));
          return bits;
      }
  
      /** {@inheritDoc} */
      @Override
      public void writeTo(AnnotatedOutput out, DalvInsn insn) {
          RegisterSpecList regs = insn.getRegisters();
          int cpi = ((CstInsn) insn).getIndex();
  
          write(out,
                opcodeUnit(insn,
                           makeByte(regs.get(0).getReg(), regs.get(1).getReg())),
                (short) cpi);
      }
  }
  