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.CstMethodRef; 25import com.android.dx.rop.cst.CstType; 26import com.android.dx.util.AnnotatedOutput; 27 28/** 29 * Instruction format {@code 3rc}. See the instruction format spec 30 * for details. 31 */ 32public final class Form3rc extends InsnFormat { 33 /** {@code non-null;} unique instance of this class */ 34 public static final InsnFormat THE_ONE = new Form3rc(); 35 36 /** 37 * Constructs an instance. This class is not publicly 38 * instantiable. Use {@link #THE_ONE}. 39 */ 40 private Form3rc() { 41 // This space intentionally left blank. 42 } 43 44 /** {@inheritDoc} */ 45 @Override 46 public String insnArgString(DalvInsn insn) { 47 return regRangeString(insn.getRegisters()) + ", " + 48 cstString(insn); 49 } 50 51 /** {@inheritDoc} */ 52 @Override 53 public String insnCommentString(DalvInsn insn, boolean noteIndices) { 54 if (noteIndices) { 55 return cstComment(insn); 56 } else { 57 return ""; 58 } 59 } 60 61 /** {@inheritDoc} */ 62 @Override 63 public int codeSize() { 64 return 3; 65 } 66 67 /** {@inheritDoc} */ 68 @Override 69 public boolean isCompatible(DalvInsn insn) { 70 if (!(insn instanceof CstInsn)) { 71 return false; 72 } 73 74 CstInsn ci = (CstInsn) insn; 75 int cpi = ci.getIndex(); 76 Constant cst = ci.getConstant(); 77 78 if (! unsignedFitsInShort(cpi)) { 79 return false; 80 } 81 82 if (!((cst instanceof CstMethodRef) || 83 (cst instanceof CstType))) { 84 return false; 85 } 86 87 RegisterSpecList regs = ci.getRegisters(); 88 int sz = regs.size(); 89 90 return (regs.size() == 0) || 91 (isRegListSequential(regs) && 92 unsignedFitsInShort(regs.get(0).getReg()) && 93 unsignedFitsInByte(regs.getWordCount())); 94 } 95 96 /** {@inheritDoc} */ 97 @Override 98 public void writeTo(AnnotatedOutput out, DalvInsn insn) { 99 RegisterSpecList regs = insn.getRegisters(); 100 int cpi = ((CstInsn) insn).getIndex(); 101 int firstReg = (regs.size() == 0) ? 0 : regs.get(0).getReg(); 102 int count = regs.getWordCount(); 103 104 write(out, opcodeUnit(insn, count), (short) cpi, (short) firstReg); 105 } 106} 107