| // Copyright (c) 2021, 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.dex.Constants; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| import com.android.tools.r8.ir.optimize.DeadCodeRemover.DeadInstructionResult; |
| import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget; |
| import com.android.tools.r8.ir.optimize.InliningConstraints; |
| |
| /** |
| * To preserve stack-map table information regarding uninitializedThis flags the |
| * UninitializedThisLocalRead is added to every instance-initializer's exits to fake a "read" of |
| * this. For more information, see b/183285081 |
| */ |
| public class UninitializedThisLocalRead extends Instruction { |
| |
| private static final String ERROR_MESSAGE = |
| "Unexpected attempt to emit/use UninitializedThisLocalRead."; |
| |
| public UninitializedThisLocalRead(Value inValue) { |
| super(null, inValue); |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.UNINITIALIZED_THIS_LOCAL_READ; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, ProgramMethod context) { |
| return false; |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| return Constants.U16BIT_MAX; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| return Constants.U16BIT_MAX; |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| // Non-materializing so no stack values are needed. |
| } |
| |
| @Override |
| public DeadInstructionResult canBeDeadCode(AppView<?> appView, IRCode code) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public boolean hasInvariantOutType() { |
| return true; |
| } |
| } |