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.RegisterSpec; 23import com.android.dx.rop.code.RegisterSpecList; 24import com.android.dx.rop.cst.Constant; 25import com.android.dx.rop.cst.CstFieldRef; 26import com.android.dx.rop.cst.CstString; 27import com.android.dx.rop.cst.CstType; 28import com.android.dx.util.AnnotatedOutput; 29 30import java.util.BitSet; 31 32/** 33 * Instruction format {@code 31c}. See the instruction format spec 34 * for details. 35 */ 36public final class Form31c extends InsnFormat { 37 /** {@code non-null;} unique instance of this class */ 38 public static final InsnFormat THE_ONE = new Form31c(); 39 40 /** 41 * Constructs an instance. This class is not publicly 42 * instantiable. Use {@link #THE_ONE}. 43 */ 44 private Form31c() { 45 // This space intentionally left blank. 46 } 47 48 /** {@inheritDoc} */ 49 @Override 50 public String insnArgString(DalvInsn insn) { 51 RegisterSpecList regs = insn.getRegisters(); 52 return regs.get(0).regString() + ", " + cstString(insn); 53 } 54 55 /** {@inheritDoc} */ 56 @Override 57 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 58 if (noteIndices) { 59 return cstComment(insn); 60 } else { 61 return ""; 62 } 63 } 64 65 /** {@inheritDoc} */ 66 @Override 67 public int codeSize() { 68 return 3; 69 } 70 71 /** {@inheritDoc} */ 72 @Override 73 public boolean isCompatible(DalvInsn insn) { 74 if (!(insn instanceof CstInsn)) { 75 return false; 76 } 77 78 RegisterSpecList regs = insn.getRegisters(); 79 RegisterSpec reg; 80 81 switch (regs.size()) { 82 case 1: { 83 reg = regs.get(0); 84 break; 85 } 86 case 2: { 87 /* 88 * This format is allowed for ops that are effectively 89 * 2-arg but where the two args are identical. 90 */ 91 reg = regs.get(0); 92 if (reg.getReg() != regs.get(1).getReg()) { 93 return false; 94 } 95 break; 96 } 97 default: { 98 return false; 99 } 100 } 101 102 if (!unsignedFitsInByte(reg.getReg())) { 103 return false; 104 } 105 106 CstInsn ci = (CstInsn) insn; 107 Constant cst = ci.getConstant(); 108 109 return (cst instanceof CstType) || 110 (cst instanceof CstFieldRef) || 111 (cst instanceof CstString); 112 } 113 114 /** {@inheritDoc} */ 115 @Override 116 public BitSet compatibleRegs(DalvInsn insn) { 117 RegisterSpecList regs = insn.getRegisters(); 118 int sz = regs.size(); 119 BitSet bits = new BitSet(sz); 120 boolean compat = unsignedFitsInByte(regs.get(0).getReg()); 121 122 if (sz == 1) { 123 bits.set(0, compat); 124 } else { 125 if (regs.get(0).getReg() == regs.get(1).getReg()) { 126 bits.set(0, compat); 127 bits.set(1, compat); 128 } 129 } 130 131 return bits; 132 } 133 134 /** {@inheritDoc} */ 135 @Override 136 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 137 RegisterSpecList regs = insn.getRegisters(); 138 int cpi = ((CstInsn) insn).getIndex(); 139 140 write(out, opcodeUnit(insn, regs.get(0).getReg()), cpi); 141 } 142} 143