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.CstInsn; 20import com.android.dx.dex.code.DalvInsn; 21import com.android.dx.dex.code.InsnFormat; 22import com.android.dx.rop.code.RegisterSpecList; 23import com.android.dx.rop.cst.Constant; 24import com.android.dx.rop.cst.CstFieldRef; 25import com.android.dx.rop.cst.CstType; 26import com.android.dx.util.AnnotatedOutput; 27 28import java.util.BitSet; 29 30/** 31 * Instruction format {@code 22c}. See the instruction format spec 32 * for details. 33 */ 34public final class Form22c extends InsnFormat { 35 /** {@code non-null;} unique instance of this class */ 36 public static final InsnFormat THE_ONE = new Form22c(); 37 38 /** 39 * Constructs an instance. This class is not publicly 40 * instantiable. Use {@link #THE_ONE}. 41 */ 42 private Form22c() { 43 // This space intentionally left blank. 44 } 45 46 /** {@inheritDoc} */ 47 @Override 48 public String insnArgString(DalvInsn insn) { 49 RegisterSpecList regs = insn.getRegisters(); 50 return regs.get(0).regString() + ", " + regs.get(1).regString() + 51 ", " + cstString(insn); 52 } 53 54 /** {@inheritDoc} */ 55 @Override 56 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 57 if (noteIndices) { 58 return cstComment(insn); 59 } else { 60 return ""; 61 } 62 } 63 64 /** {@inheritDoc} */ 65 @Override 66 public int codeSize() { 67 return 2; 68 } 69 70 /** {@inheritDoc} */ 71 @Override 72 public boolean isCompatible(DalvInsn insn) { 73 RegisterSpecList regs = insn.getRegisters(); 74 if (!((insn instanceof CstInsn) && 75 (regs.size() == 2) && 76 unsignedFitsInNibble(regs.get(0).getReg()) && 77 unsignedFitsInNibble(regs.get(1).getReg()))) { 78 return false; 79 } 80 81 CstInsn ci = (CstInsn) insn; 82 int cpi = ci.getIndex(); 83 84 if (! unsignedFitsInShort(cpi)) { 85 return false; 86 } 87 88 Constant cst = ci.getConstant(); 89 return (cst instanceof CstType) || 90 (cst instanceof CstFieldRef); 91 } 92 93 /** {@inheritDoc} */ 94 @Override 95 public BitSet compatibleRegs(DalvInsn insn) { 96 RegisterSpecList regs = insn.getRegisters(); 97 BitSet bits = new BitSet(2); 98 99 bits.set(0, unsignedFitsInNibble(regs.get(0).getReg())); 100 bits.set(1, unsignedFitsInNibble(regs.get(1).getReg())); 101 return bits; 102 } 103 104 /** {@inheritDoc} */ 105 @Override 106 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 107 RegisterSpecList regs = insn.getRegisters(); 108 int cpi = ((CstInsn) insn).getIndex(); 109 110 write(out, 111 opcodeUnit(insn, 112 makeByte(regs.get(0).getReg(), regs.get(1).getReg())), 113 (short) cpi); 114 } 115} 116