| // Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| package com.android.tools.r8.ir.code; |
| |
| import com.android.tools.r8.cf.LoadStoreHelper; |
| import com.android.tools.r8.code.Const16; |
| import com.android.tools.r8.code.Const4; |
| import com.android.tools.r8.dex.Constants; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| |
| public class AlwaysMaterializingDefinition extends ConstInstruction { |
| |
| public AlwaysMaterializingDefinition(Value out) { |
| super(out); |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.ALWAYS_MATERIALIZING_DEFINITION; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public boolean canBeDeadCode(AppView<?> appView, IRCode code) { |
| // This instruction may never be considered dead as it must remain. |
| return false; |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| int register = builder.allocatedRegister(outValue, getNumber()); |
| builder.add( |
| this, (register & 0xf) == register ? new Const4(register, 0) : new Const16(register, 0)); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| return false; |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| return Constants.U8BIT_MAX; |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| throw new Unreachable(); |
| } |
| } |