| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.dexgen.dex.code.form; |
| |
| import com.android.dexgen.dex.code.CstInsn; |
| import com.android.dexgen.dex.code.DalvInsn; |
| import com.android.dexgen.dex.code.InsnFormat; |
| import com.android.dexgen.rop.code.RegisterSpec; |
| import com.android.dexgen.rop.code.RegisterSpecList; |
| import com.android.dexgen.rop.cst.Constant; |
| import com.android.dexgen.rop.cst.CstFieldRef; |
| import com.android.dexgen.rop.cst.CstString; |
| import com.android.dexgen.rop.cst.CstType; |
| import com.android.dexgen.util.AnnotatedOutput; |
| |
| /** |
| * Instruction format {@code 21c}. See the instruction format spec |
| * for details. |
| */ |
| public final class Form21c extends InsnFormat { |
| /** {@code non-null;} unique instance of this class */ |
| public static final InsnFormat THE_ONE = new Form21c(); |
| |
| /** |
| * Constructs an instance. This class is not publicly |
| * instantiable. Use {@link #THE_ONE}. |
| */ |
| private Form21c() { |
| // This space intentionally left blank. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String insnArgString(DalvInsn insn) { |
| RegisterSpecList regs = insn.getRegisters(); |
| return regs.get(0).regString() + ", " + cstString(insn); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String insnCommentString(DalvInsn insn, boolean noteIndices) { |
| if (noteIndices) { |
| return cstComment(insn); |
| } else { |
| return ""; |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int codeSize() { |
| return 2; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean isCompatible(DalvInsn insn) { |
| if (!(insn instanceof CstInsn)) { |
| return false; |
| } |
| |
| RegisterSpecList regs = insn.getRegisters(); |
| RegisterSpec reg; |
| |
| switch (regs.size()) { |
| case 1: { |
| reg = regs.get(0); |
| break; |
| } |
| case 2: { |
| /* |
| * This format is allowed for ops that are effectively |
| * 2-arg but where the two args are identical. |
| */ |
| reg = regs.get(0); |
| if (reg.getReg() != regs.get(1).getReg()) { |
| return false; |
| } |
| break; |
| } |
| default: { |
| return false; |
| } |
| } |
| |
| if (!unsignedFitsInByte(reg.getReg())) { |
| return false; |
| } |
| |
| CstInsn ci = (CstInsn) insn; |
| int cpi = ci.getIndex(); |
| |
| if (! unsignedFitsInShort(cpi)) { |
| return false; |
| } |
| |
| Constant cst = ci.getConstant(); |
| return (cst instanceof CstType) || |
| (cst instanceof CstFieldRef) || |
| (cst instanceof CstString); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public InsnFormat nextUp() { |
| return Form31c.THE_ONE; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void writeTo(AnnotatedOutput out, DalvInsn insn) { |
| RegisterSpecList regs = insn.getRegisters(); |
| int cpi = ((CstInsn) insn).getIndex(); |
| |
| write(out, |
| opcodeUnit(insn, regs.get(0).getReg()), |
| (short) cpi); |
| } |
| } |