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/*
 * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package org.jetbrains.kotlin.ir.declarations

import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
import org.jetbrains.kotlin.ir.expressions.IrBody
import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
import org.jetbrains.kotlin.ir.types.IrType
import org.jetbrains.kotlin.ir.util.transformIfNeeded
import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
import org.jetbrains.kotlin.ir.visitors.IrElementVisitor

// This class is not autogenerated to for the sake refactoring IR parameters - see KT-68003.
// However, it must be kept in sync with [org.jetbrains.kotlin.ir.generator.IrTree.function].
sealed class IrFunction : IrDeclarationBase(), IrPossiblyExternalDeclaration, IrDeclarationWithVisibility, IrTypeParametersContainer,
    IrSymbolOwner, IrDeclarationParent, IrReturnTarget, IrMemberWithContainerSource, IrMetadataSourceOwner {
    @ObsoleteDescriptorBasedAPI
    abstract override val descriptor: FunctionDescriptor

    abstract override val symbol: IrFunctionSymbol

    abstract var isInline: Boolean

    abstract var isExpect: Boolean

    abstract var returnType: IrType

    abstract var dispatchReceiverParameter: IrValueParameter?

    abstract var extensionReceiverParameter: IrValueParameter?

    @OptIn(DelicateIrParameterIndexSetter::class)
    var valueParameters: List = emptyList()
        set(value) {
            for (parameter in field) {
                parameter.index = -1
            }
            for ((index, parameter) in value.withIndex()) {
                parameter.index = index
            }
            field = value
        }

    abstract var contextReceiverParametersCount: Int

    abstract var body: IrBody?

    override fun  acceptChildren(visitor: IrElementVisitor, data: D) {
        typeParameters.forEach { it.accept(visitor, data) }
        dispatchReceiverParameter?.accept(visitor, data)
        extensionReceiverParameter?.accept(visitor, data)
        valueParameters.forEach { it.accept(visitor, data) }
        body?.accept(visitor, data)
    }

    override fun  transformChildren(transformer: IrElementTransformer, data: D) {
        typeParameters = typeParameters.transformIfNeeded(transformer, data)
        dispatchReceiverParameter = dispatchReceiverParameter?.transform(transformer, data)
        extensionReceiverParameter = extensionReceiverParameter?.transform(transformer, data)
        valueParameters = valueParameters.transformIfNeeded(transformer, data)
        body = body?.transform(transformer, data)
    }
}