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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.dx.dex.code.form;
     18 
     19 import com.android.dx.dex.code.DalvInsn;
     20 import com.android.dx.dex.code.InsnFormat;
     21 import com.android.dx.dex.code.SimpleInsn;
     22 import com.android.dx.rop.code.RegisterSpecList;
     23 import com.android.dx.util.AnnotatedOutput;
     24 import java.util.BitSet;
     25 
     26 /**
     27  * Instruction format {@code 11x}. See the instruction format spec
     28  * for details.
     29  */
     30 public final class Form11x extends InsnFormat {
     31     /** {@code non-null;} unique instance of this class */
     32     public static final InsnFormat THE_ONE = new Form11x();
     33 
     34     /**
     35      * Constructs an instance. This class is not publicly
     36      * instantiable. Use {@link #THE_ONE}.
     37      */
     38     private Form11x() {
     39         // This space intentionally left blank.
     40     }
     41 
     42     /** {@inheritDoc} */
     43     @Override
     44     public String insnArgString(DalvInsn insn) {
     45         RegisterSpecList regs = insn.getRegisters();
     46         return regs.get(0).regString();
     47     }
     48 
     49     /** {@inheritDoc} */
     50     @Override
     51     public String insnCommentString(DalvInsn insn, boolean noteIndices) {
     52         // This format has no comment.
     53         return "";
     54     }
     55 
     56     /** {@inheritDoc} */
     57     @Override
     58     public int codeSize() {
     59         return 1;
     60     }
     61 
     62     /** {@inheritDoc} */
     63     @Override
     64     public boolean isCompatible(DalvInsn insn) {
     65         RegisterSpecList regs = insn.getRegisters();
     66         return (insn instanceof SimpleInsn) &&
     67             (regs.size() == 1) &&
     68             unsignedFitsInByte(regs.get(0).getReg());
     69     }
     70 
     71     /** {@inheritDoc} */
     72     @Override
     73     public BitSet compatibleRegs(DalvInsn insn) {
     74         RegisterSpecList regs = insn.getRegisters();
     75         BitSet bits = new BitSet(1);
     76 
     77         bits.set(0, unsignedFitsInByte(regs.get(0).getReg()));
     78         return bits;
     79     }
     80 
     81     /** {@inheritDoc} */
     82     @Override
     83     public void writeTo(AnnotatedOutput out, DalvInsn insn) {
     84         RegisterSpecList regs = insn.getRegisters();
     85         write(out, opcodeUnit(insn, regs.get(0).getReg()));
     86     }
     87 }
     88