| // Copyright (c) 2020, 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.analysis.inlining; |
| |
| import com.android.tools.r8.ir.code.InvokeMethod; |
| import com.android.tools.r8.ir.code.Value; |
| import it.unimi.dsi.fastutil.ints.IntList; |
| |
| /** Constraint that is satisfied if a specific argument is always null. */ |
| public class NullSimpleInliningConstraint extends SimpleInliningArgumentConstraint { |
| |
| private NullSimpleInliningConstraint(int argumentIndex) { |
| super(argumentIndex); |
| } |
| |
| static NullSimpleInliningConstraint create( |
| int argumentIndex, SimpleInliningConstraintFactory witness) { |
| assert witness != null; |
| return new NullSimpleInliningConstraint(argumentIndex); |
| } |
| |
| @Override |
| public boolean isNull() { |
| return true; |
| } |
| |
| @Override |
| public boolean isSatisfied(InvokeMethod invoke) { |
| Value argument = getArgument(invoke); |
| assert argument.getType().isReferenceType(); |
| return argument.getType().isDefinitelyNull(); |
| } |
| |
| @Override |
| public SimpleInliningConstraint rewrittenWithUnboxedArguments(IntList unboxedArgumentIndices) { |
| if (unboxedArgumentIndices.contains(getArgumentIndex())) { |
| // TODO(b/176067541): Could be refined to an argument-equals-int constraint. |
| return NeverSimpleInliningConstraint.getInstance(); |
| } |
| return this; |
| } |
| } |