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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.CstInsn;
     20 import com.android.dx.dex.code.DalvInsn;
     21 import com.android.dx.dex.code.InsnFormat;
     22 import com.android.dx.rop.code.RegisterSpecList;
     23 import com.android.dx.rop.cst.Constant;
     24 import com.android.dx.rop.cst.CstMethodRef;
     25 import com.android.dx.rop.cst.CstType;
     26 import com.android.dx.util.AnnotatedOutput;
     27 
     28 /**
     29  * Instruction format {@code 3rc}. See the instruction format spec
     30  * for details.
     31  */
     32 public final class Form3rc extends InsnFormat {
     33     /** {@code non-null;} unique instance of this class */
     34     public static final InsnFormat THE_ONE = new Form3rc();
     35 
     36     /**
     37      * Constructs an instance. This class is not publicly
     38      * instantiable. Use {@link #THE_ONE}.
     39      */
     40     private Form3rc() {
     41         // This space intentionally left blank.
     42     }
     43 
     44     /** {@inheritDoc} */
     45     @Override
     46     public String insnArgString(DalvInsn insn) {
     47         return regRangeString(insn.getRegisters()) + ", " +
     48             insn.cstString();
     49     }
     50 
     51     /** {@inheritDoc} */
     52     @Override
     53     public String insnCommentString(DalvInsn insn, boolean noteIndices) {
     54         if (noteIndices) {
     55             return insn.cstComment();
     56         } else {
     57             return "";
     58         }
     59     }
     60 
     61     /** {@inheritDoc} */
     62     @Override
     63     public int codeSize() {
     64         return 3;
     65     }
     66 
     67     /** {@inheritDoc} */
     68     @Override
     69     public boolean isCompatible(DalvInsn insn) {
     70         if (!(insn instanceof CstInsn)) {
     71             return false;
     72         }
     73 
     74         CstInsn ci = (CstInsn) insn;
     75         int cpi = ci.getIndex();
     76         Constant cst = ci.getConstant();
     77 
     78         if (! unsignedFitsInShort(cpi)) {
     79             return false;
     80         }
     81 
     82         if (!((cst instanceof CstMethodRef) ||
     83               (cst instanceof CstType))) {
     84             return false;
     85         }
     86 
     87         RegisterSpecList regs = ci.getRegisters();
     88         int sz = regs.size();
     89 
     90         return (regs.size() == 0) ||
     91             (isRegListSequential(regs) &&
     92              unsignedFitsInShort(regs.get(0).getReg()) &&
     93              unsignedFitsInByte(regs.getWordCount()));
     94     }
     95 
     96     /** {@inheritDoc} */
     97     @Override
     98     public void writeTo(AnnotatedOutput out, DalvInsn insn) {
     99         RegisterSpecList regs = insn.getRegisters();
    100         int cpi = ((CstInsn) insn).getIndex();
    101         int firstReg = (regs.size() == 0) ? 0 : regs.get(0).getReg();
    102         int count = regs.getWordCount();
    103 
    104         write(out, opcodeUnit(insn, count), (short) cpi, (short) firstReg);
    105     }
    106 }
    107