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 23x}. See the instruction format spec 29 * for details. 30 */ 31public final class Form23x extends InsnFormat { 32 /** {@code non-null;} unique instance of this class */ 33 public static final InsnFormat THE_ONE = new Form23x(); 34 35 /** 36 * Constructs an instance. This class is not publicly 37 * instantiable. Use {@link #THE_ONE}. 38 */ 39 private Form23x() { 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 ", " + regs.get(2).regString(); 49 } 50 51 /** {@inheritDoc} */ 52 @Override 53 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 54 // This format has no comment. 55 return ""; 56 } 57 58 /** {@inheritDoc} */ 59 @Override 60 public int codeSize() { 61 return 2; 62 } 63 64 /** {@inheritDoc} */ 65 @Override 66 public boolean isCompatible(DalvInsn insn) { 67 RegisterSpecList regs = insn.getRegisters(); 68 69 return (insn instanceof SimpleInsn) && 70 (regs.size() == 3) && 71 unsignedFitsInByte(regs.get(0).getReg()) && 72 unsignedFitsInByte(regs.get(1).getReg()) && 73 unsignedFitsInByte(regs.get(2).getReg()); 74 } 75 76 /** {@inheritDoc} */ 77 @Override 78 public BitSet compatibleRegs(DalvInsn insn) { 79 RegisterSpecList regs = insn.getRegisters(); 80 BitSet bits = new BitSet(3); 81 82 bits.set(0, unsignedFitsInByte(regs.get(0).getReg())); 83 bits.set(1, unsignedFitsInByte(regs.get(1).getReg())); 84 bits.set(2, unsignedFitsInByte(regs.get(2).getReg())); 85 return bits; 86 } 87 88 /** {@inheritDoc} */ 89 @Override 90 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 91 RegisterSpecList regs = insn.getRegisters(); 92 write(out, 93 opcodeUnit(insn, regs.get(0).getReg()), 94 codeUnit(regs.get(1).getReg(), regs.get(2).getReg())); 95 } 96} 97