ZeroSizeInsn.java revision 579d7739c53a2707ad711a2d2cae46d7d782f061
146d4c2bc3267f3f028f39e7e311b0f89aba2e4fdTorne (Richard Coles)/* 2d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * Copyright (C) 2007 The Android Open Source Project 3d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * 4d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * Licensed under the Apache License, Version 2.0 (the "License"); 5d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * you may not use this file except in compliance with the License. 6d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * You may obtain a copy of the License at 74e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * 8d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * http://www.apache.org/licenses/LICENSE-2.0 9d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * 10d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * Unless required by applicable law or agreed to in writing, software 11d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * distributed under the License is distributed on an "AS IS" BASIS, 12d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * See the License for the specific language governing permissions and 14d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) * limitations under the License. 15d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) */ 16d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) 17d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles)package com.android.dx.dex.code; 184e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) 19d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles)import com.android.dx.rop.code.RegisterSpecList; 20d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles)import com.android.dx.rop.code.SourcePosition; 214e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles)import com.android.dx.util.AnnotatedOutput; 224e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) 234e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles)/** 244e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * Pseudo-instruction base class for zero-size (no code emitted) 254e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * instructions, which are generally used for tracking metainformation 264e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * about the code they are adjacent to. 274e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) */ 284e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles)public abstract class ZeroSizeInsn extends DalvInsn { 294e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) /** 304e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * Constructs an instance. The output address of this instance is initially 314e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * unknown ({@code -1}). 324e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * 334e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) * @param position {@code non-null;} source position 344e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) */ 354e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) public ZeroSizeInsn(SourcePosition position) { 364e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) super(Dops.SPECIAL_FORMAT, position, RegisterSpecList.EMPTY); 374e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) } 38d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) 39d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) /** {@inheritDoc} */ 40d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) @Override 41d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) public final int codeSize() { 42d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) return 0; 43d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) } 44d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) 45d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) /** {@inheritDoc} */ 46d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) @Override 47d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) public final void writeTo(AnnotatedOutput out) { 484e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) // Nothing to do here, for this class. 494e180b6a0b4720a9b8e9e959a882386f690f08ffTorne (Richard Coles) } 50d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) 51d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) /** {@inheritDoc} */ 52d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) @Override 53d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) public final DalvInsn withOpcode(Dop opcode) { 54 throw new RuntimeException("unsupported"); 55 } 56 57 /** {@inheritDoc} */ 58 @Override 59 public DalvInsn withRegisterOffset(int delta) { 60 return withRegisters(getRegisters().withOffset(delta)); 61 } 62} 63