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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.rop.code;
     18 
     19 import com.android.dx.rop.cst.Constant;
     20 
     21 /**
     22  * Instruction which contains an explicit reference to a constant.
     23  */
     24 public abstract class CstInsn
     25         extends Insn {
     26     /** {@code non-null;} the constant */
     27     private final Constant cst;
     28 
     29     /**
     30      * Constructs an instance.
     31      *
     32      * @param opcode {@code non-null;} the opcode
     33      * @param position {@code non-null;} source position
     34      * @param result {@code null-ok;} spec for the result, if any
     35      * @param sources {@code non-null;} specs for all the sources
     36      * @param cst {@code non-null;} constant
     37      */
     38     public CstInsn(Rop opcode, SourcePosition position, RegisterSpec result,
     39                    RegisterSpecList sources, Constant cst) {
     40         super(opcode, position, result, sources);
     41 
     42         if (cst == null) {
     43             throw new NullPointerException("cst == null");
     44         }
     45 
     46         this.cst = cst;
     47     }
     48 
     49     /** {@inheritDoc} */
     50     @Override
     51     public String getInlineString() {
     52         return cst.toHuman();
     53     }
     54 
     55     /**
     56      * Gets the constant.
     57      *
     58      * @return {@code non-null;} the constant
     59      */
     60     public Constant getConstant() {
     61         return cst;
     62     }
     63 
     64     /** {@inheritDoc} */
     65     @Override
     66     public boolean contentEquals(Insn b) {
     67         /*
     68          * The cast (CstInsn)b below should always succeed since
     69          * Insn.contentEquals compares classes of this and b.
     70          */
     71         return super.contentEquals(b)
     72                 && cst.equals(((CstInsn)b).getConstant());
     73     }
     74 }
     75