| /* |
| * 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.DalvInsn; |
| import com.android.dexgen.dex.code.HighRegisterPrefix; |
| import com.android.dexgen.dex.code.InsnFormat; |
| import com.android.dexgen.dex.code.SimpleInsn; |
| import com.android.dexgen.rop.code.RegisterSpec; |
| import com.android.dexgen.rop.code.RegisterSpecList; |
| import com.android.dexgen.util.AnnotatedOutput; |
| |
| /** |
| * Instruction format {@code 12x}. See the instruction format spec |
| * for details. |
| */ |
| public final class Form12x extends InsnFormat { |
| /** {@code non-null;} unique instance of this class */ |
| public static final InsnFormat THE_ONE = new Form12x(); |
| |
| /** |
| * Constructs an instance. This class is not publicly |
| * instantiable. Use {@link #THE_ONE}. |
| */ |
| private Form12x() { |
| // This space intentionally left blank. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String insnArgString(DalvInsn insn) { |
| RegisterSpecList regs = insn.getRegisters(); |
| int sz = regs.size(); |
| |
| /* |
| * The (sz - 2) and (sz - 1) below makes this code work for |
| * both the two- and three-register ops. (See "case 3" in |
| * isCompatible(), below.) |
| */ |
| |
| return regs.get(sz - 2).regString() + ", " + |
| regs.get(sz - 1).regString(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String insnCommentString(DalvInsn insn, boolean noteIndices) { |
| // This format has no comment. |
| return ""; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int codeSize() { |
| return 1; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean isCompatible(DalvInsn insn) { |
| if (!(insn instanceof SimpleInsn)) { |
| return false; |
| } |
| |
| RegisterSpecList regs = insn.getRegisters(); |
| RegisterSpec rs1; |
| RegisterSpec rs2; |
| |
| switch (regs.size()) { |
| case 2: { |
| rs1 = regs.get(0); |
| rs2 = regs.get(1); |
| break; |
| } |
| case 3: { |
| /* |
| * This format is allowed for ops that are effectively |
| * 3-arg but where the first two args are identical. |
| */ |
| rs1 = regs.get(1); |
| rs2 = regs.get(2); |
| if (rs1.getReg() != regs.get(0).getReg()) { |
| return false; |
| } |
| break; |
| } |
| default: { |
| return false; |
| } |
| } |
| |
| return unsignedFitsInNibble(rs1.getReg()) && |
| unsignedFitsInNibble(rs2.getReg()); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public InsnFormat nextUp() { |
| return Form22x.THE_ONE; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void writeTo(AnnotatedOutput out, DalvInsn insn) { |
| RegisterSpecList regs = insn.getRegisters(); |
| int sz = regs.size(); |
| |
| /* |
| * The (sz - 2) and (sz - 1) below makes this code work for |
| * both the two- and three-register ops. (See "case 3" in |
| * isCompatible(), above.) |
| */ |
| |
| write(out, opcodeUnit(insn, |
| makeByte(regs.get(sz - 2).getReg(), |
| regs.get(sz - 1).getReg()))); |
| } |
| } |