Home | History | Annotate | Download | only in form 
      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.dexgen.dex.code.form;
     18 
     19 import com.android.dexgen.dex.code.DalvInsn;
     20 import com.android.dexgen.dex.code.InsnFormat;
     21 import com.android.dexgen.dex.code.SimpleInsn;
     22 import com.android.dexgen.util.AnnotatedOutput;
     23 
     24 /**
     25  * Instruction format {@code 10x}. See the instruction format spec
     26  * for details.
     27  */
     28 public final class Form10x extends InsnFormat {
     29     /** {@code non-null;} unique instance of this class */
     30     public static final InsnFormat THE_ONE = new Form10x();
     31 
     32     /**
     33      * Constructs an instance. This class is not publicly
     34      * instantiable. Use {@link #THE_ONE}.
     35      */
     36     private Form10x() {
     37         // This space intentionally left blank.
     38     }
     39 
     40     /** {@inheritDoc} */
     41     @Override
     42     public String insnArgString(DalvInsn insn) {
     43         // This format has no arguments.
     44         return "";
     45     }
     46 
     47     /** {@inheritDoc} */
     48     @Override
     49     public String insnCommentString(DalvInsn insn, boolean noteIndices) {
     50         // This format has no comment.
     51         return "";
     52     }
     53 
     54     /** {@inheritDoc} */
     55     @Override
     56     public int codeSize() {
     57         return 1;
     58     }
     59 
     60     /** {@inheritDoc} */
     61     @Override
     62     public boolean isCompatible(DalvInsn insn) {
     63         return (insn instanceof SimpleInsn) &&
     64             (insn.getRegisters().size() == 0);
     65     }
     66 
     67     /** {@inheritDoc} */
     68     @Override
     69     public InsnFormat nextUp() {
     70         return null;
     71     }
     72 
     73     /** {@inheritDoc} */
     74     @Override
     75     public void writeTo(AnnotatedOutput out, DalvInsn insn) {
     76         write(out, opcodeUnit(insn, 0));
     77     }
     78 }
     79