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.DalvOps; 21 import com.android.dexgen.dex.code.InsnFormat; 22 import com.android.dexgen.util.AnnotatedOutput; 23 24 /** 25 * Instruction format for nonstandard format instructions, which aren't 26 * generally real instructions but do end up appearing in instruction 27 * lists. Most of the overridden methods on this class end up throwing 28 * exceptions, as code should know (implicitly or explicitly) to avoid 29 * using this class. The one exception is {@link #isCompatible}, which 30 * always returns {@code true}. 31 */ 32 public final class SpecialFormat extends InsnFormat { 33 /** {@code non-null;} unique instance of this class */ 34 public static final InsnFormat THE_ONE = new SpecialFormat(); 35 36 /** 37 * Constructs an instance. This class is not publicly 38 * instantiable. Use {@link #THE_ONE}. 39 */ 40 private SpecialFormat() { 41 // This space intentionally left blank. 42 } 43 44 /** {@inheritDoc} */ 45 @Override 46 public String insnArgString(DalvInsn insn) { 47 throw new RuntimeException("unsupported"); 48 } 49 50 /** {@inheritDoc} */ 51 @Override 52 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 53 throw new RuntimeException("unsupported"); 54 } 55 56 /** {@inheritDoc} */ 57 @Override 58 public int codeSize() { 59 throw new RuntimeException("unsupported"); 60 } 61 62 /** {@inheritDoc} */ 63 @Override 64 public boolean isCompatible(DalvInsn insn) { 65 return true; 66 } 67 68 /** {@inheritDoc} */ 69 @Override 70 public InsnFormat nextUp() { 71 throw new RuntimeException("unsupported"); 72 } 73 74 /** {@inheritDoc} */ 75 @Override 76 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 77 throw new RuntimeException("unsupported"); 78 } 79 } 80
