Extracted common function for creating fake overrides

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/IrUtils.kt

@@ -17,9 +17,7 @@
 package org.jetbrains.kotlin.backend.konan.ir
 
 import org.jetbrains.kotlin.backend.konan.Context
-import org.jetbrains.kotlin.descriptors.ClassConstructorDescriptor
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.SourceElement
+import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.descriptors.impl.ClassConstructorDescriptorImpl
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
@@ -50,6 +48,30 @@ fun ir2stringWhole(ir: IrElement?, withDescriptors: Boolean = false): String {
     return strWriter.toString()
 }
 
+internal fun DeclarationDescriptor.createFakeOverrideDescriptor(owner: ClassDescriptor): DeclarationDescriptor? {
+    // We need to copy descriptors for vtable building, thus take only functions and properties.
+    return when (this) {
+        is FunctionDescriptor ->
+            newCopyBuilder()
+                    .setOwner(owner)
+                    .setKind(CallableMemberDescriptor.Kind.FAKE_OVERRIDE)
+                    .setCopyOverrides(true)
+                    .build()!!.apply {
+                overriddenDescriptors += this@createFakeOverrideDescriptor
+            }
+        is PropertyDescriptor ->
+            copy(
+                    /* newOwner      = */ owner,
+                    /* modality      = */ modality,
+                    /* visibility    = */ visibility,
+                    /* kind          = */ CallableMemberDescriptor.Kind.FAKE_OVERRIDE,
+                    /* copyOverrides = */ true).apply {
+                overriddenDescriptors += this@createFakeOverrideDescriptor
+            }
+        else -> null
+    }
+}
+
 internal fun ClassDescriptor.createSimpleDelegatingConstructorDescriptor(superConstructorDescriptor: ClassConstructorDescriptor, isPrimary: Boolean = false)
         : ClassConstructorDescriptor {
     val constructorDescriptor = ClassConstructorDescriptorImpl.createSynthesized(

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/EnumClassLowering.kt

@@ -25,6 +25,7 @@ import org.jetbrains.kotlin.backend.konan.Context
 import org.jetbrains.kotlin.backend.konan.descriptors.getKonanInternalFunctions
 import org.jetbrains.kotlin.backend.konan.descriptors.synthesizedName
 import org.jetbrains.kotlin.backend.konan.ir.createArrayOfExpression
+import org.jetbrains.kotlin.backend.konan.ir.createFakeOverrideDescriptor
 import org.jetbrains.kotlin.backend.konan.ir.createSimpleDelegatingConstructor
 import org.jetbrains.kotlin.backend.konan.ir.createSimpleDelegatingConstructorDescriptor
 import org.jetbrains.kotlin.descriptors.*
@@ -271,7 +272,7 @@ internal class EnumClassLowering(val context: Context) : ClassLoweringPass {
 
             val contributedDescriptors = irClass.descriptor.unsubstitutedMemberScope
                     .getContributedDescriptors()
-                    .map { createFakeOverrideDescriptor(defaultClassDescriptor, it) }
+                    .map { it.createFakeOverrideDescriptor(defaultClassDescriptor) }
                     .filterNotNull()
                     .toList()
             defaultClassDescriptor.initialize(SimpleMemberScope(contributedDescriptors), constructors, null)
@@ -279,31 +280,6 @@ internal class EnumClassLowering(val context: Context) : ClassLoweringPass {
             return defaultClass
         }
 
-        private fun createFakeOverrideDescriptor(owner: ClassDescriptor, descriptor: DeclarationDescriptor): DeclarationDescriptor? {
-            // We need to copy descriptors for vtable building, thus take only functions and properties.
-            return when (descriptor) {
-                is FunctionDescriptor ->
-                    descriptor
-                            .newCopyBuilder()
-                            .setOwner(owner)
-                            .setKind(CallableMemberDescriptor.Kind.FAKE_OVERRIDE)
-                            .setCopyOverrides(true)
-                            .build()!!.apply {
-                        overriddenDescriptors += descriptor
-                    }
-                is PropertyDescriptor ->
-                        descriptor.copy(
-                                /* newOwner      = */ owner,
-                                /* modality      = */ descriptor.modality,
-                                /* visibility    = */ descriptor.visibility,
-                                /* kind          = */ CallableMemberDescriptor.Kind.FAKE_OVERRIDE,
-                                /* copyOverrides = */ true).apply {
-                            overriddenDescriptors += descriptor
-                        }
-                else -> null
-            }
-        }
-
         private fun createImplObject() {
             val startOffset = irClass.startOffset
             val endOffset = irClass.endOffset