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