FIR: Copy attributes when copying declaration

Otherwise they share FirDeclarationAttributes instance that might lead
to problems when modifying only one of them

compiler/fir/cones/src/org/jetbrains/kotlin/fir/utils/ArrayMap.kt

@@ -10,6 +10,8 @@ sealed class ArrayMap<T : Any> : Iterable<T> {
 
     abstract operator fun set(index: Int, value: T)
     abstract operator fun get(index: Int): T?
+
+    abstract fun copy(): ArrayMap<T>
 }
 
 fun ArrayMap<*>.isEmpty(): Boolean = size == 0
@@ -27,6 +29,8 @@ internal object EmptyArrayMap : ArrayMap<Nothing>() {
         return null
     }
 
+    override fun copy(): ArrayMap<Nothing> = this
+
     override fun iterator(): Iterator<Nothing> {
         return object : Iterator<Nothing> {
             override fun hasNext(): Boolean = false
@@ -48,6 +52,8 @@ internal class OneElementArrayMap<T : Any>(val value: T, val index: Int) : Array
         return if (index == this.index) value else null
     }
 
+    override fun copy(): ArrayMap<T> = OneElementArrayMap(value, index)
+
     override fun iterator(): Iterator<T> {
         return object : Iterator<T> {
             private var notVisited = true
@@ -68,16 +74,20 @@ internal class OneElementArrayMap<T : Any>(val value: T, val index: Int) : Array
     }
 }
 
-internal class ArrayMapImpl<T : Any> : ArrayMap<T>() {
+internal class ArrayMapImpl<T : Any> private constructor(
+    private var data: Array<Any?>
+) : ArrayMap<T>() {
     companion object {
         private const val DEFAULT_SIZE = 20
         private const val INCREASE_K = 2
     }
 
+    constructor() : this(arrayOfNulls<Any>(DEFAULT_SIZE))
+
     override var size: Int = 0
         private set
 
-    private var data = arrayOfNulls<Any>(DEFAULT_SIZE)
+
     private fun ensureCapacity(index: Int) {
         if (data.size <= index) {
             data = data.copyOf(data.size * INCREASE_K)
@@ -97,6 +107,8 @@ internal class ArrayMapImpl<T : Any> : ArrayMap<T>() {
         return data.getOrNull(index) as T?
     }
 
+    override fun copy(): ArrayMap<T> = ArrayMapImpl(data.copyOf())
+
     override fun iterator(): Iterator<T> {
         return object : AbstractIterator<T>() {
             private var index = -1

compiler/fir/cones/src/org/jetbrains/kotlin/fir/utils/AttributeArrayOwner.kt

@@ -17,11 +17,15 @@ import kotlin.reflect.KClass
  *   from components in [ComponentArrayOwner]
  */
 @OptIn(Protected::class)
-abstract class AttributeArrayOwner<K : Any, T : Any> : AbstractArrayMapOwner<K, T>() {
+abstract class AttributeArrayOwner<K : Any, T : Any> protected constructor(
-    @Suppress("UNCHECKED_CAST")
+    arrayMap: ArrayMap<T>
-    final override var arrayMap: ArrayMap<T> = EmptyArrayMap as ArrayMap<T>
+) : AbstractArrayMapOwner<K, T>() {
+    final override var arrayMap: ArrayMap<T> = arrayMap
         private set
 
+    @Suppress("UNCHECKED_CAST")
+    constructor() : this(EmptyArrayMap as ArrayMap<T>)
+
     final override fun registerComponent(tClass: KClass<out K>, value: T) {
         val id = typeRegistry.getId(tClass)
         when (arrayMap.size) {

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirConstructorBuilder.kt

@@ -101,7 +101,7 @@ inline fun buildConstructorCopy(original: FirConstructor, init: FirConstructorBu
     copyBuilder.session = original.session
     copyBuilder.resolvePhase = original.resolvePhase
     copyBuilder.origin = original.origin
-    copyBuilder.attributes = original.attributes
+    copyBuilder.attributes = original.attributes.copy()
     copyBuilder.returnTypeRef = original.returnTypeRef
     copyBuilder.receiverTypeRef = original.receiverTypeRef
     copyBuilder.typeParameters.addAll(original.typeParameters)

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirPropertyAccessorBuilder.kt

@@ -98,7 +98,7 @@ inline fun buildPropertyAccessorCopy(original: FirPropertyAccessor, init: FirPro
     copyBuilder.session = original.session
     copyBuilder.resolvePhase = original.resolvePhase
     copyBuilder.origin = original.origin
-    copyBuilder.attributes = original.attributes
+    copyBuilder.attributes = original.attributes.copy()
     copyBuilder.returnTypeRef = original.returnTypeRef
     copyBuilder.valueParameters.addAll(original.valueParameters)
     copyBuilder.body = original.body

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirPropertyBuilder.kt

@@ -106,7 +106,7 @@ inline fun buildPropertyCopy(original: FirProperty, init: FirPropertyBuilder.()
     copyBuilder.session = original.session
     copyBuilder.resolvePhase = original.resolvePhase
     copyBuilder.origin = original.origin
-    copyBuilder.attributes = original.attributes
+    copyBuilder.attributes = original.attributes.copy()
     copyBuilder.returnTypeRef = original.returnTypeRef
     copyBuilder.receiverTypeRef = original.receiverTypeRef
     copyBuilder.name = original.name

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirSimpleFunctionBuilder.kt

@@ -101,7 +101,7 @@ inline fun buildSimpleFunctionCopy(original: FirSimpleFunction, init: FirSimpleF
     copyBuilder.session = original.session
     copyBuilder.resolvePhase = original.resolvePhase
     copyBuilder.origin = original.origin
-    copyBuilder.attributes = original.attributes
+    copyBuilder.attributes = original.attributes.copy()
     copyBuilder.returnTypeRef = original.returnTypeRef
     copyBuilder.receiverTypeRef = original.receiverTypeRef
     copyBuilder.valueParameters.addAll(original.valueParameters)

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirValueParameterBuilder.kt

@@ -86,7 +86,7 @@ inline fun buildValueParameterCopy(original: FirValueParameter, init: FirValuePa
     copyBuilder.session = original.session
     copyBuilder.resolvePhase = original.resolvePhase
     copyBuilder.origin = original.origin
-    copyBuilder.attributes = original.attributes
+    copyBuilder.attributes = original.attributes.copy()
     copyBuilder.returnTypeRef = original.returnTypeRef
     copyBuilder.name = original.name
     copyBuilder.symbol = original.symbol

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirDeclarationAttributes.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.fir.declarations
 
+import org.jetbrains.kotlin.fir.utils.ArrayMap
 import org.jetbrains.kotlin.fir.utils.AttributeArrayOwner
 import org.jetbrains.kotlin.fir.utils.NullableArrayMapAccessor
 import org.jetbrains.kotlin.fir.utils.TypeRegistry
@@ -14,10 +15,13 @@ import kotlin.reflect.KProperty
 
 abstract class FirDeclarationDataKey
 
-class FirDeclarationAttributes : AttributeArrayOwner<FirDeclarationDataKey, Any>() {
+class FirDeclarationAttributes : AttributeArrayOwner<FirDeclarationDataKey, Any> {
     override val typeRegistry: TypeRegistry<FirDeclarationDataKey, Any>
         get() = FirDeclarationDataRegistry
 
+    constructor() : super()
+    private constructor(arrayMap: ArrayMap<Any>) : super(arrayMap)
+
     internal operator fun set(key: KClass<out FirDeclarationDataKey>, value: Any?) {
         if (value == null) {
             removeComponent(key)
@@ -25,6 +29,8 @@ class FirDeclarationAttributes : AttributeArrayOwner<FirDeclarationDataKey, Any>
             registerComponent(key, value)
         }
     }
+
+    fun copy(): FirDeclarationAttributes = FirDeclarationAttributes(arrayMap.copy())
 }
 
 /*

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/builder.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.fir.tree.generator.printer
 
+import org.jetbrains.kotlin.fir.tree.generator.declarationAttributesType
 import org.jetbrains.kotlin.fir.tree.generator.model.*
 import java.io.File
 
@@ -294,8 +295,9 @@ private fun SmartPrinter.printDslBuildCopyFunction(
         println("}")
         println("val copyBuilder = $builderType()")
         for (field in builder.allFields) {
-            when (field.origin) {
+            when {
-                is FieldList -> println("copyBuilder.${field.name}.addAll(original.${field.name})")
+                field.origin is FieldList -> println("copyBuilder.${field.name}.addAll(original.${field.name})")
+                field.type == declarationAttributesType.type -> println("copyBuilder.${field.name} = original.${field.name}.copy()")
                 else -> println("copyBuilder.${field.name} = original.${field.name}")
             }
         }