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.dexgen.dex.code.form; 18 19import com.android.dexgen.dex.code.DalvInsn; 20import com.android.dexgen.dex.code.InsnFormat; 21import com.android.dexgen.dex.code.SimpleInsn; 22import com.android.dexgen.util.AnnotatedOutput; 23 24/** 25 * Instruction format {@code 10x}. See the instruction format spec 26 * for details. 27 */ 28public final class Form10x extends InsnFormat { 29 /** {@code non-null;} unique instance of this class */ 30 public static final InsnFormat THE_ONE = new Form10x(); 31 32 /** 33 * Constructs an instance. This class is not publicly 34 * instantiable. Use {@link #THE_ONE}. 35 */ 36 private Form10x() { 37 // This space intentionally left blank. 38 } 39 40 /** {@inheritDoc} */ 41 @Override 42 public String insnArgString(DalvInsn insn) { 43 // This format has no arguments. 44 return ""; 45 } 46 47 /** {@inheritDoc} */ 48 @Override 49 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 50 // This format has no comment. 51 return ""; 52 } 53 54 /** {@inheritDoc} */ 55 @Override 56 public int codeSize() { 57 return 1; 58 } 59 60 /** {@inheritDoc} */ 61 @Override 62 public boolean isCompatible(DalvInsn insn) { 63 return (insn instanceof SimpleInsn) && 64 (insn.getRegisters().size() == 0); 65 } 66 67 /** {@inheritDoc} */ 68 @Override 69 public InsnFormat nextUp() { 70 return null; 71 } 72 73 /** {@inheritDoc} */ 74 @Override 75 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 76 write(out, opcodeUnit(insn, 0)); 77 } 78} 79