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.CstInsn; 20import com.android.dexgen.dex.code.DalvInsn; 21import com.android.dexgen.dex.code.InsnFormat; 22import com.android.dexgen.rop.code.RegisterSpecList; 23import com.android.dexgen.rop.cst.Constant; 24import com.android.dexgen.rop.cst.CstLiteralBits; 25import com.android.dexgen.util.AnnotatedOutput; 26 27/** 28 * Instruction format {@code 22b}. See the instruction format spec 29 * for details. 30 */ 31public final class Form22b extends InsnFormat { 32 /** {@code non-null;} unique instance of this class */ 33 public static final InsnFormat THE_ONE = new Form22b(); 34 35 /** 36 * Constructs an instance. This class is not publicly 37 * instantiable. Use {@link #THE_ONE}. 38 */ 39 private Form22b() { 40 // This space intentionally left blank. 41 } 42 43 /** {@inheritDoc} */ 44 @Override 45 public String insnArgString(DalvInsn insn) { 46 RegisterSpecList regs = insn.getRegisters(); 47 CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant(); 48 49 return regs.get(0).regString() + ", " + regs.get(1).regString() + 50 ", " + literalBitsString(value); 51 } 52 53 /** {@inheritDoc} */ 54 @Override 55 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 56 CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant(); 57 return literalBitsComment(value, 8); 58 } 59 60 /** {@inheritDoc} */ 61 @Override 62 public int codeSize() { 63 return 2; 64 } 65 66 /** {@inheritDoc} */ 67 @Override 68 public boolean isCompatible(DalvInsn insn) { 69 RegisterSpecList regs = insn.getRegisters(); 70 if (!((insn instanceof CstInsn) && 71 (regs.size() == 2) && 72 unsignedFitsInByte(regs.get(0).getReg()) && 73 unsignedFitsInByte(regs.get(1).getReg()))) { 74 return false; 75 } 76 77 CstInsn ci = (CstInsn) insn; 78 Constant cst = ci.getConstant(); 79 80 if (!(cst instanceof CstLiteralBits)) { 81 return false; 82 } 83 84 CstLiteralBits cb = (CstLiteralBits) cst; 85 86 return cb.fitsInInt() && signedFitsInByte(cb.getIntBits()); 87 } 88 89 /** {@inheritDoc} */ 90 @Override 91 public InsnFormat nextUp() { 92 return Form22s.THE_ONE; 93 } 94 95 /** {@inheritDoc} */ 96 @Override 97 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 98 RegisterSpecList regs = insn.getRegisters(); 99 int value = 100 ((CstLiteralBits) ((CstInsn) insn).getConstant()).getIntBits(); 101 102 write(out, 103 opcodeUnit(insn, regs.get(0).getReg()), 104 codeUnit(regs.get(1).getReg(), value & 0xff)); 105 } 106} 107