kotlin.reflect.jvm.reflectLambda.kt Maven / Gradle / Ivy
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/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
@file:Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER")
package kotlin.reflect.jvm
import org.jetbrains.kotlin.load.kotlin.JvmNameResolver
import org.jetbrains.kotlin.serialization.ProtoBuf
import org.jetbrains.kotlin.serialization.deserialization.DeserializationContext
import org.jetbrains.kotlin.serialization.deserialization.MemberDeserializer
import org.jetbrains.kotlin.serialization.deserialization.TypeTable
import org.jetbrains.kotlin.serialization.deserialization.descriptors.SinceKotlinInfoTable
import org.jetbrains.kotlin.serialization.jvm.BitEncoding
import org.jetbrains.kotlin.serialization.jvm.JvmProtoBuf
import org.jetbrains.kotlin.serialization.jvm.JvmProtoBufUtil
import kotlin.reflect.KFunction
import kotlin.reflect.jvm.internal.EmptyContainerForLocal
import kotlin.reflect.jvm.internal.KFunctionImpl
import kotlin.reflect.jvm.internal.getOrCreateModule
/**
* This is an experimental API. Given a class for a compiled Kotlin lambda or a function expression,
* returns a [KFunction] instance providing introspection capabilities for that lambda or function expression and its parameters.
* Not all features are currently supported, in particular [KCallable.call] and [KCallable.callBy] will fail at the moment.
*/
fun Function.reflect(): KFunction? {
val annotation = javaClass.getAnnotation(Metadata::class.java) ?: return null
val input = BitEncoding.decodeBytes(annotation.d1).inputStream()
val nameResolver = JvmNameResolver(
JvmProtoBuf.StringTableTypes.parseDelimitedFrom(input, JvmProtoBufUtil.EXTENSION_REGISTRY), annotation.d2
)
val proto = ProtoBuf.Function.parseFrom(input, JvmProtoBufUtil.EXTENSION_REGISTRY)
val moduleData = javaClass.getOrCreateModule()
val context = DeserializationContext(
moduleData.deserialization, nameResolver, moduleData.module, TypeTable(proto.typeTable), SinceKotlinInfoTable.EMPTY,
containerSource = null, parentTypeDeserializer = null, typeParameters = proto.typeParameterList
)
val descriptor = MemberDeserializer(context).loadFunction(proto)
@Suppress("UNCHECKED_CAST")
return KFunctionImpl(EmptyContainerForLocal, descriptor) as KFunction
}