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.dex.code.SimpleInsn; 22import com.android.dx.rop.code.RegisterSpecList; 23import com.android.dx.util.AnnotatedOutput; 24 25import java.util.BitSet; 26 27/** 28 * Instruction format {@code 22x}. See the instruction format spec 29 * for details. 30 */ 31public final class Form22x extends InsnFormat { 32 /** {@code non-null;} unique instance of this class */ 33 public static final InsnFormat THE_ONE = new Form22x(); 34 35 /** 36 * Constructs an instance. This class is not publicly 37 * instantiable. Use {@link #THE_ONE}. 38 */ 39 private Form22x() { 40 // This space intentionally left blank. 41 } 42 43 /** {@inheritDoc} */ 44 @Override 45 public String insnArgString(DalvInsn insn) { 46 RegisterSpecList regs = insn.getRegisters(); 47 return regs.get(0).regString() + ", " + regs.get(1).regString(); 48 } 49 50 /** {@inheritDoc} */ 51 @Override 52 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 53 // This format has no comment. 54 return ""; 55 } 56 57 /** {@inheritDoc} */ 58 @Override 59 public int codeSize() { 60 return 2; 61 } 62 63 /** {@inheritDoc} */ 64 @Override 65 public boolean isCompatible(DalvInsn insn) { 66 RegisterSpecList regs = insn.getRegisters(); 67 68 return (insn instanceof SimpleInsn) && 69 (regs.size() == 2) && 70 unsignedFitsInByte(regs.get(0).getReg()) && 71 unsignedFitsInShort(regs.get(1).getReg()); 72 } 73 74 /** {@inheritDoc} */ 75 @Override 76 public BitSet compatibleRegs(DalvInsn insn) { 77 RegisterSpecList regs = insn.getRegisters(); 78 BitSet bits = new BitSet(2); 79 80 bits.set(0, unsignedFitsInByte(regs.get(0).getReg())); 81 bits.set(1, unsignedFitsInShort(regs.get(1).getReg())); 82 return bits; 83 } 84 85 /** {@inheritDoc} */ 86 @Override 87 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 88 RegisterSpecList regs = insn.getRegisters(); 89 write(out, 90 opcodeUnit(insn, regs.get(0).getReg()), 91 (short) regs.get(1).getReg()); 92 } 93} 94