| // 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.graph.bytecodemetadata; |
| |
| /** |
| * A piece of information that can be attached to instructions in {@link |
| * com.android.tools.r8.graph.CfCode} and {@link com.android.tools.r8.graph.DexCode}. |
| */ |
| public class BytecodeInstructionMetadata { |
| |
| /** |
| * Set for instance and static field read instructions which are only used to write the same |
| * field. |
| * |
| * <p>Used by {@link com.android.tools.r8.ir.analysis.fieldaccess.TrivialFieldAccessReprocessor} |
| * to skip such instructions in the "is-field-read" analysis. |
| */ |
| private final boolean isReadForWrite; |
| |
| BytecodeInstructionMetadata(boolean isReadForWrite) { |
| this.isReadForWrite = isReadForWrite; |
| } |
| |
| public static Builder builder() { |
| return new Builder(); |
| } |
| |
| public static BytecodeInstructionMetadata none() { |
| return null; |
| } |
| |
| public boolean isReadForWrite() { |
| return isReadForWrite; |
| } |
| |
| public static class Builder { |
| |
| private boolean isReadForWrite; |
| |
| private boolean isEmpty() { |
| return !isReadForWrite; |
| } |
| |
| public Builder setIsReadForWrite() { |
| isReadForWrite = true; |
| return this; |
| } |
| |
| public BytecodeInstructionMetadata build() { |
| assert !isEmpty(); |
| return new BytecodeInstructionMetadata(isReadForWrite); |
| } |
| } |
| } |