| // 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.kotlin; |
| |
| import com.android.tools.r8.graph.DexClass; |
| import kotlinx.metadata.KmLambdaVisitor; |
| import kotlinx.metadata.jvm.KotlinClassMetadata; |
| |
| public final class KotlinSyntheticClass extends KotlinInfo<KotlinClassMetadata.SyntheticClass> { |
| public enum Flavour { |
| KotlinStyleLambda, |
| JavaStyleLambda, |
| Unclassified |
| } |
| |
| private final Flavour flavour; |
| |
| static KotlinSyntheticClass fromKotlinClassMetadata( |
| KotlinClassMetadata kotlinClassMetadata, Kotlin kotlin, DexClass clazz) { |
| assert kotlinClassMetadata instanceof KotlinClassMetadata.SyntheticClass; |
| KotlinClassMetadata.SyntheticClass syntheticClass = |
| (KotlinClassMetadata.SyntheticClass) kotlinClassMetadata; |
| if (isKotlinStyleLambda(syntheticClass, kotlin, clazz)) { |
| return new KotlinSyntheticClass(Flavour.KotlinStyleLambda, syntheticClass); |
| } else if (isJavaStyleLambda(syntheticClass, kotlin, clazz)) { |
| return new KotlinSyntheticClass(Flavour.JavaStyleLambda, syntheticClass); |
| } else { |
| return new KotlinSyntheticClass(Flavour.Unclassified, syntheticClass); |
| } |
| } |
| |
| private KotlinSyntheticClass(Flavour flavour, KotlinClassMetadata.SyntheticClass metadata) { |
| this.flavour = flavour; |
| validateMetadata(metadata); |
| this.metadata = metadata; |
| } |
| |
| @Override |
| void validateMetadata(KotlinClassMetadata.SyntheticClass metadata) { |
| if (metadata.isLambda()) { |
| SyntheticClassMetadataVisitor visitor = new SyntheticClassMetadataVisitor(); |
| // To avoid lazy parsing/verifying metadata. |
| metadata.accept(visitor); |
| } |
| } |
| |
| private static class SyntheticClassMetadataVisitor extends KmLambdaVisitor { |
| } |
| |
| public boolean isLambda() { |
| return isKotlinStyleLambda() || isJavaStyleLambda(); |
| } |
| |
| public boolean isKotlinStyleLambda() { |
| return flavour == Flavour.KotlinStyleLambda; |
| } |
| |
| public boolean isJavaStyleLambda() { |
| return flavour == Flavour.JavaStyleLambda; |
| } |
| |
| @Override |
| public final Kind getKind() { |
| return Kind.Synthetic; |
| } |
| |
| @Override |
| public final boolean isSyntheticClass() { |
| return true; |
| } |
| |
| @Override |
| public KotlinSyntheticClass asSyntheticClass() { |
| return this; |
| } |
| |
| /** |
| * Returns {@code true} if the given {@link DexClass} is a Kotlin-style lambda: |
| * a class that |
| * 1) is recognized as lambda in its Kotlin metadata; |
| * 2) directly extends kotlin.jvm.internal.Lambda |
| */ |
| private static boolean isKotlinStyleLambda( |
| KotlinClassMetadata.SyntheticClass metadata, Kotlin kotlin, DexClass clazz) { |
| return metadata.isLambda() |
| && clazz.superType == kotlin.functional.lambdaType; |
| } |
| |
| /** |
| * Returns {@code true} if the given {@link DexClass} is a Java-style lambda: |
| * a class that |
| * 1) is recognized as lambda in its Kotlin metadata; |
| * 2) doesn't extend any other class; |
| * 3) directly implements only one Java SAM. |
| */ |
| private static boolean isJavaStyleLambda( |
| KotlinClassMetadata.SyntheticClass metadata, Kotlin kotlin, DexClass clazz) { |
| return metadata.isLambda() |
| && clazz.superType == kotlin.factory.objectType |
| && clazz.interfaces.size() == 1; |
| } |
| |
| } |