org.jetbrains.kotlin.backend.common.overrides.DeepCopyIrTreeWithSymbolsForFakeOverrides.kt Maven / Gradle / Ivy

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package org.jetbrains.kotlin.backend.common.overrides

import org.jetbrains.kotlin.backend.common.DescriptorsToIrRemapper
import org.jetbrains.kotlin.backend.common.WrappedDescriptorPatcher
import org.jetbrains.kotlin.ir.IrElement
import org.jetbrains.kotlin.ir.declarations.IrClass
import org.jetbrains.kotlin.ir.declarations.IrTypeParametersContainer
import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
import org.jetbrains.kotlin.ir.symbols.IrClassifierSymbol
import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
import org.jetbrains.kotlin.ir.types.*
import org.jetbrains.kotlin.ir.types.impl.buildSimpleType
import org.jetbrains.kotlin.ir.types.impl.makeTypeProjection
import org.jetbrains.kotlin.ir.util.*
import org.jetbrains.kotlin.ir.visitors.acceptVoid

// This is basicly modelled after the inliner copier.
class DeepCopyIrTreeWithSymbolsForFakeOverrides(typeArguments: Map) {

    fun copy(irElement: IrElement, parent: IrClass): IrElement {
        // Create new symbols.
        irElement.acceptVoid(symbolRemapper)

        // Make symbol remapper aware of the callsite's type arguments.
        // Copy IR.
        val result = irElement.transform(copier, data = null)

        // Bind newly created IR with wrapped descriptors.
        result.acceptVoid(WrappedDescriptorPatcher)

        result.patchDeclarationParents(parent)
        return result
    }

    private inner class FakeOverrideTypeRemapper(
        val symbolRemapper: SymbolRemapper,
        val typeArguments: Map
    ) : TypeRemapper {

        override fun enterScope(irTypeParametersContainer: IrTypeParametersContainer) {}

        override fun leaveScope() {}

        private fun remapTypeArguments(arguments: List) =
            arguments.map { argument ->
                (argument as? IrTypeProjection)?.let { makeTypeProjection(remapType(it.type), it.variance) }
                    ?: argument
            }

        override fun remapType(type: IrType): IrType {
            if (type !is IrSimpleType) return type

            val substitutedType = typeArguments[type.classifier]

            if (substitutedType is IrDynamicType) return substitutedType

            if (substitutedType is IrSimpleType) {
                return substitutedType.buildSimpleType {
                    kotlinType = null
                    hasQuestionMark = type.hasQuestionMark or substitutedType.isMarkedNullable()
                }
            }

            return type.buildSimpleType {
                kotlinType = null
                classifier = symbolRemapper.getReferencedClassifier(type.classifier)
                arguments = remapTypeArguments(type.arguments)
                annotations = type.annotations.map { it.transform(copier, null) as IrConstructorCall }
            }
        }
    }

    private class FakeOverrideSymbolRemapperImpl(
        private val typeArguments: Map,
        descriptorsRemapper: DescriptorsRemapper
    ) :
        DeepCopySymbolRemapper(descriptorsRemapper) {

        override fun getReferencedClassifier(symbol: IrClassifierSymbol): IrClassifierSymbol {
            val result = super.getReferencedClassifier(symbol)
            if (result !is IrTypeParameterSymbol)
                return result
            return typeArguments[result]?.classifierOrNull ?: result
        }
    }

    private val symbolRemapper = FakeOverrideSymbolRemapperImpl(typeArguments, DescriptorsToIrRemapper)
    private val copier = FakeOverrideCopier(
            symbolRemapper,
            FakeOverrideTypeRemapper(symbolRemapper, typeArguments),
            SymbolRenamer.DEFAULT
        )
}