androidx.compose.compiler.plugins.kotlin.lower.ComposableSymbolRemapper.kt Maven / Gradle / Ivy
/*
* Copyright 2020 The Android Open Source Project
*
* 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.
*/
package androidx.compose.compiler.plugins.kotlin.lower
import androidx.compose.compiler.plugins.kotlin.k1.hasComposableAnnotation
import org.jetbrains.kotlin.descriptors.ClassConstructorDescriptor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.descriptors.ParameterDescriptor
import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
import org.jetbrains.kotlin.ir.descriptors.IrBasedDeclarationDescriptor
import org.jetbrains.kotlin.ir.util.DeepCopySymbolRemapper
import org.jetbrains.kotlin.ir.util.DescriptorsRemapper
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.StarProjectionImpl
/**
* This symbol remapper is aware of possible descriptor signature change to align
* function signature and descriptor signature in cases of composable value parameters.
* It removes descriptors whenever the signature changes, forcing it to be generated from IR.
*
* E.g. when function has a signature of:
* ```
* fun A(@Composable f: () -> Unit)
* ```
* it is going to be converted to incompatible signature of:
* ```
* fun A(f: (Composer<*>, Int) -> Unit)
* ```
* Same applies for receiver and return types.
*
* This conversion is only required with decoys, but can be applied to the JVM as well for
* consistency.
*
* This is K1 specific. In K2, descriptors are only there for backwards compatibility and
* always reflect the IR.
*/
class ComposableSymbolRemapper : DeepCopySymbolRemapper(
object : DescriptorsRemapper {
override fun remapDeclaredConstructor(
descriptor: ClassConstructorDescriptor
): ClassConstructorDescriptor? =
descriptor.takeUnless { it.isTransformed() }
override fun remapDeclaredSimpleFunction(
descriptor: FunctionDescriptor
): FunctionDescriptor? =
descriptor.takeUnless { it.isTransformed() }
override fun remapDeclaredValueParameter(
descriptor: ParameterDescriptor
): ParameterDescriptor? =
descriptor.takeUnless { it.isTransformed() }
override fun remapDeclaredTypeParameter(
descriptor: TypeParameterDescriptor
): TypeParameterDescriptor? =
descriptor.takeUnless { it.isTransformed() }
private fun ClassConstructorDescriptor.isTransformed(): Boolean =
this is IrBasedDeclarationDescriptor<*> ||
valueParameters.any { it.type.containsComposable() }
private fun FunctionDescriptor.isTransformed(): Boolean =
this is IrBasedDeclarationDescriptor<*> ||
valueParameters.any { it.type.containsComposable() } ||
returnType?.containsComposable() == true
private fun ParameterDescriptor.isTransformed(): Boolean =
this is IrBasedDeclarationDescriptor<*> ||
type.containsComposable() ||
containingDeclaration.let { it is FunctionDescriptor && it.isTransformed() }
private fun TypeParameterDescriptor.isTransformed(): Boolean =
this is IrBasedDeclarationDescriptor<*> ||
containingDeclaration.let { it is FunctionDescriptor && it.isTransformed() }
private fun KotlinType.containsComposable(): Boolean =
hasComposableAnnotation() ||
arguments.any { it !is StarProjectionImpl && it.type.containsComposable() }
}
)