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 17package com.android.dx.dex.code.form; 18 19import com.android.dx.dex.code.DalvInsn; 20import com.android.dx.dex.code.InsnFormat; 21import com.android.dx.util.AnnotatedOutput; 22 23/** 24 * Instruction format for nonstandard format instructions, which aren't 25 * generally real instructions but do end up appearing in instruction 26 * lists. Most of the overridden methods on this class end up throwing 27 * exceptions, as code should know (implicitly or explicitly) to avoid 28 * using this class. The one exception is {@link #isCompatible}, which 29 * always returns {@code true}. 30 */ 31public final class SpecialFormat extends InsnFormat { 32 /** {@code non-null;} unique instance of this class */ 33 public static final InsnFormat THE_ONE = new SpecialFormat(); 34 35 /** 36 * Constructs an instance. This class is not publicly 37 * instantiable. Use {@link #THE_ONE}. 38 */ 39 private SpecialFormat() { 40 // This space intentionally left blank. 41 } 42 43 /** {@inheritDoc} */ 44 @Override 45 public String insnArgString(DalvInsn insn) { 46 throw new RuntimeException("unsupported"); 47 } 48 49 /** {@inheritDoc} */ 50 @Override 51 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 52 throw new RuntimeException("unsupported"); 53 } 54 55 /** {@inheritDoc} */ 56 @Override 57 public int codeSize() { 58 throw new RuntimeException("unsupported"); 59 } 60 61 /** {@inheritDoc} */ 62 @Override 63 public boolean isCompatible(DalvInsn insn) { 64 return true; 65 } 66 67 /** {@inheritDoc} */ 68 @Override 69 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 70 throw new RuntimeException("unsupported"); 71 } 72} 73