org.jetbrains.kotlin.backend.jvm.lower.RenameFieldsLowering.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2019 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.backend.jvm.lower
import org.jetbrains.kotlin.backend.common.ClassLoweringPass
import org.jetbrains.kotlin.backend.common.CommonBackendContext
import org.jetbrains.kotlin.backend.common.phaser.makeIrFilePhase
import org.jetbrains.kotlin.ir.declarations.IrClass
import org.jetbrains.kotlin.ir.util.fields
import org.jetbrains.kotlin.name.Name
internal val renameFieldsPhase = makeIrFilePhase(
{ RenameFieldsLowering() },
name = "RenameFields",
description = "Rename private fields (including fields copied from companion object) to avoid JVM declaration clash"
)
private class RenameFieldsLowering : ClassLoweringPass {
override fun lower(irClass: IrClass) {
val fields = irClass.fields.toMutableList()
fields.sortBy {
when {
// We never rename public ABI fields (public and protected visibility) since they are accessible from Java
// even in cases when Kotlin code would prefer an accessor. (And in some cases, such as enum entries and const
// fields, Kotlin references the fields directly too.) Therefore we consider such fields first, in order to make
// sure it'll claim its original name. There can be multiple such fields, in which case they will cause a platform
// declaration clash if they map to the same JVM type - nothing we can do about that.
it.visibility.isPublicAPI -> 0
// If there are non-public non-static and static (moved from companion) fields with the same name, we try to make
// static properties retain their original names first, since this is what the old JVM backend did. However this
// can easily be changed without any major binary compatibility consequences (ignoring Java reflection).
it.isStatic -> 1
else -> 2
}
}
val count = hashMapOf()
for (field in fields) {
val oldName = field.name
val index = count[oldName] ?: 0
if (index != 0 && !field.visibility.isPublicAPI) {
field.name = Name.identifier("$oldName$$index")
}
count[oldName] = index + 1
}
}
}