| // 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.utils; |
| |
| import com.android.tools.r8.graph.DexItemFactory; |
| import com.android.tools.r8.ir.analysis.type.TypeElement; |
| import com.android.tools.r8.ir.code.Instruction; |
| import com.android.tools.r8.ir.code.InvokeVirtual; |
| import com.android.tools.r8.ir.code.NewInstance; |
| import com.android.tools.r8.ir.code.Value; |
| |
| public class ValueUtils { |
| |
| public static boolean isStringBuilder(Value value, DexItemFactory dexItemFactory) { |
| TypeElement type = value.getType(); |
| return type.isClassType() |
| && type.asClassType().getClassType() == dexItemFactory.stringBuilderType; |
| } |
| |
| public static boolean isNonNullStringBuilder(Value value, DexItemFactory dexItemFactory) { |
| while (true) { |
| if (value.isPhi()) { |
| return false; |
| } |
| |
| Instruction definition = value.getDefinition(); |
| if (definition.isNewInstance()) { |
| NewInstance newInstance = definition.asNewInstance(); |
| return newInstance.clazz == dexItemFactory.stringBuilderType; |
| } |
| |
| if (definition.isInvokeVirtual()) { |
| InvokeVirtual invoke = definition.asInvokeVirtual(); |
| if (dexItemFactory.stringBuilderMethods.isAppendMethod(invoke.getInvokedMethod())) { |
| value = invoke.getReceiver(); |
| continue; |
| } |
| } |
| |
| // Unhandled definition. |
| return false; |
| } |
| } |
| } |