Form31c.java revision 2ad60cfc28e14ee8f0bb038720836a4696c478ad
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 30/** 31 * Instruction format <code>31c</code>. See the instruction format spec 32 * for details. 33 */ 34public final class Form31c extends InsnFormat { 35 /** non-null; unique instance of this class */ 36 public static final InsnFormat THE_ONE = new Form31c(); 37 38 /** 39 * Constructs an instance. This class is not publicly 40 * instantiable. Use {@link #THE_ONE}. 41 */ 42 private Form31c() { 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() + ", " + cstString(insn); 51 } 52 53 /** {@inheritDoc} */ 54 @Override 55 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 56 if (noteIndices) { 57 return cstComment(insn); 58 } else { 59 return ""; 60 } 61 } 62 63 /** {@inheritDoc} */ 64 @Override 65 public int codeSize() { 66 return 3; 67 } 68 69 /** {@inheritDoc} */ 70 @Override 71 public boolean isCompatible(DalvInsn insn) { 72 if (!(insn instanceof CstInsn)) { 73 return false; 74 } 75 76 RegisterSpecList regs = insn.getRegisters(); 77 RegisterSpec reg; 78 79 switch (regs.size()) { 80 case 1: { 81 reg = regs.get(0); 82 break; 83 } 84 case 2: { 85 /* 86 * This format is allowed for ops that are effectively 87 * 2-arg but where the two args are identical. 88 */ 89 reg = regs.get(0); 90 if (reg.getReg() != regs.get(1).getReg()) { 91 return false; 92 } 93 break; 94 } 95 default: { 96 return false; 97 } 98 } 99 100 if (!unsignedFitsInByte(reg.getReg())) { 101 return false; 102 } 103 104 CstInsn ci = (CstInsn) insn; 105 Constant cst = ci.getConstant(); 106 107 return ((cst instanceof CstType) || 108 (cst instanceof CstFieldRef) || 109 (cst instanceof CstString)); 110 } 111 112 /** {@inheritDoc} */ 113 @Override 114 public InsnFormat nextUp() { 115 return null; 116 } 117 118 /** {@inheritDoc} */ 119 @Override 120 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 121 RegisterSpecList regs = insn.getRegisters(); 122 int cpi = ((CstInsn) insn).getIndex(); 123 124 write(out, 125 opcodeUnit(insn, regs.get(0).getReg()), 126 (short) cpi, 127 (short) (cpi >> 16)); 128 } 129} 130