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.CstLiteralBits; 25import com.android.dx.util.AnnotatedOutput; 26import java.util.BitSet; 27 28/** 29 * Instruction format {@code 21s}. See the instruction format spec 30 * for details. 31 */ 32public final class Form21s extends InsnFormat { 33 /** {@code non-null;} unique instance of this class */ 34 public static final InsnFormat THE_ONE = new Form21s(); 35 36 /** 37 * Constructs an instance. This class is not publicly 38 * instantiable. Use {@link #THE_ONE}. 39 */ 40 private Form21s() { 41 // This space intentionally left blank. 42 } 43 44 /** {@inheritDoc} */ 45 @Override 46 public String insnArgString(DalvInsn insn) { 47 RegisterSpecList regs = insn.getRegisters(); 48 CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant(); 49 50 return regs.get(0).regString() + ", " + 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, 16); 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() == 1) && 72 unsignedFitsInByte(regs.get(0).getReg()))) { 73 return false; 74 } 75 76 CstInsn ci = (CstInsn) insn; 77 Constant cst = ci.getConstant(); 78 79 if (!(cst instanceof CstLiteralBits)) { 80 return false; 81 } 82 83 CstLiteralBits cb = (CstLiteralBits) cst; 84 85 return cb.fitsInInt() && signedFitsInShort(cb.getIntBits()); 86 } 87 88 /** {@inheritDoc} */ 89 @Override 90 public BitSet compatibleRegs(DalvInsn insn) { 91 RegisterSpecList regs = insn.getRegisters(); 92 BitSet bits = new BitSet(1); 93 94 bits.set(0, unsignedFitsInByte(regs.get(0).getReg())); 95 return bits; 96 } 97 98 /** {@inheritDoc} */ 99 @Override 100 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 101 RegisterSpecList regs = insn.getRegisters(); 102 int value = 103 ((CstLiteralBits) ((CstInsn) insn).getConstant()).getIntBits(); 104 105 write(out, 106 opcodeUnit(insn, regs.get(0).getReg()), 107 (short) value); 108 } 109} 110