[WasmJs] Add support for external class reflection

Fix #KT-64890

libraries/stdlib/wasm/internal/kotlin/wasm/internal/TypeInfo.kt

@@ -78,6 +78,7 @@ internal fun <T> wasmIsInterface(obj: Any): Boolean =
 internal fun <T> wasmTypeId(): Int =
     implementedAsIntrinsic
 
+//TODO("Remove after bootstrap KT-65322")
 @ExcludedFromCodegen
 internal fun <T> wasmGetTypeInfoData(): TypeInfoData =
-    implementedAsIntrinsic
+    implementedAsIntrinsic

libraries/stdlib/wasm/js/src/kotlin/reflect/KExternalClassImpl.kt

@@ -0,0 +1,31 @@
+/*
+ * 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 kotlin.wasm.internal
+
+import kotlin.reflect.*
+
+@Suppress("UNUSED_PARAMETER")
+private fun getJsClassName(jsKlass: JsAny): String? =
+    js("jsKlass.name")
+
+@Suppress("UNUSED_PARAMETER")
+private fun instanceOf(ref: JsAny, jsKlass: JsAny): Boolean =
+    js("ref instanceof jsKlass")
+
+internal class KExternalClassImpl<T : Any> @WasmPrimitiveConstructor constructor(private val jsConstructor: JsAny) : KClass<T> {
+    override val simpleName: String? get() = getJsClassName(jsConstructor)
+    override val qualifiedName: String? get() = null
+
+    override fun isInstance(value: Any?): Boolean =
+        value is JsExternalBox && instanceOf(value.ref, jsConstructor)
+
+    override fun equals(other: Any?): Boolean =
+        other is KExternalClassImpl<*> && jsConstructor == other.jsConstructor
+
+    override fun hashCode(): Int = simpleName.hashCode()
+
+    override fun toString(): String = "class $simpleName"
+}

libraries/stdlib/wasm/js/src/kotlin/reflect/reflection.kt

@@ -0,0 +1,19 @@
+/*
+ * 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 kotlin.wasm.internal
+
+import kotlin.reflect.*
+
+@Suppress("UNUSED_PARAMETER")
+private fun getConstructor(obj: JsAny): JsAny? =
+    js("obj.constructor")
+
+@Suppress("UNCHECKED_CAST")
+internal actual fun <T : Any> getKClassForObject(obj: Any): KClass<T> {
+    if (obj !is JsExternalBox) return KClassImpl(getTypeInfoTypeDataByPtr(obj.typeInfo))
+    val jsConstructor = getConstructor(obj.ref) ?: error("JavaScript constructor is not defined")
+    return KExternalClassImpl(jsConstructor)
+}

libraries/stdlib/wasm/src/kotlin/reflect/KClassImpl.kt

@@ -2,13 +2,9 @@
  * Copyright 2010-2021 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 kotlin.reflect.wasm.internal
+package kotlin.wasm.internal
 
-import kotlin.reflect.*
-import kotlin.wasm.internal.TypeInfoData
-import kotlin.wasm.internal.getSuperTypeId
-import kotlin.wasm.internal.isInterfaceById
-import kotlin.wasm.internal.isInterfaceType
+import kotlin.reflect.KClass
 
 internal object NothingKClassImpl : KClass<Nothing> {
     override val simpleName: String = "Nothing"
@@ -30,10 +26,10 @@ internal object ErrorKClass : KClass<Nothing> {
     override fun hashCode(): Int = super.hashCode() // KT-24971
 }
 
-internal class KClassImpl<T : Any>(internal val typeData: TypeInfoData) : KClass<T> {
+internal class KClassImpl<T : Any> @WasmPrimitiveConstructor constructor(internal val typeData: TypeInfoData) : KClass<T> {
     override val simpleName: String get() = typeData.typeName
-    override val qualifiedName: String =
-        if (typeData.packageName.isEmpty()) typeData.typeName else "${typeData.packageName}.${typeData.typeName}"
+    override val qualifiedName: String
+        get() = if (typeData.packageName.isEmpty()) typeData.typeName else "${typeData.packageName}.${typeData.typeName}"
 
     private fun checkSuperTypeInstance(obj: Any): Boolean {
         var typeId = obj.typeInfo

libraries/stdlib/wasm/src/kotlin/reflect/associatedObjectsImpl.kt

@@ -5,7 +5,6 @@
 
 package kotlin.wasm.internal
 
-import kotlin.reflect.wasm.internal.KClassImpl
 import kotlin.reflect.KClass
 
 @PublishedApi

libraries/stdlib/wasm/src/kotlin/reflect/primitives.kt

@@ -7,7 +7,6 @@ package kotlin.wasm.internal
 
 import kotlin.reflect.KClass
 import kotlin.reflect.KFunction
-import kotlin.reflect.wasm.internal.*
 
 internal object PrimitiveClasses {
 

libraries/stdlib/wasm/src/kotlin/reflect/reflection.kt

@@ -3,12 +3,16 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-// a package is omitted to get declarations directly under the module
 package kotlin.wasm.internal
 
 import kotlin.reflect.*
-import kotlin.reflect.wasm.internal.*
 
+internal expect fun <T : Any> getKClassForObject(obj: Any): KClass<T>
+
+//TODO(Replace getKClass to intrinsic argument-less implementation after bootstrap KT-65322")
+//@ExcludedFromCodegen
+//internal fun <T : Any> getKClass(): KClass<T> =
+//    implementedAsIntrinsic
 internal fun <T : Any> getKClass(typeInfoData: TypeInfoData): KClass<T> =
     KClassImpl(typeInfoData)
 
@@ -34,12 +38,12 @@ internal fun <T : Any> getKClassFromExpression(e: T): KClass<T> =
         is DoubleArray -> PrimitiveClasses.doubleArrayClass
         is KClass<*> -> KClass::class
         is Array<*> -> PrimitiveClasses.arrayClass
-        else -> getKClass(getTypeInfoTypeDataByPtr(e.typeInfo))
+        else -> getKClassForObject(e)
     } as KClass<T>
 
 @Suppress("REIFIED_TYPE_PARAMETER_NO_INLINE")
 internal inline fun <reified T : Any> wasmGetKClass(): KClass<T> =
-    KClassImpl(wasmGetTypeInfoData<T>())
+    KClassImpl(getTypeInfoTypeDataByPtr(wasmTypeId<T>()))
 
 internal fun createKType(classifier: KClassifier, arguments: Array<KTypeProjection>, isMarkedNullable: Boolean): KType =
     KTypeImpl(classifier, arguments.asList(), isMarkedNullable)

libraries/stdlib/wasm/wasi/src/kotlin/reflect/reflection.kt

@@ -0,0 +1,12 @@
+/*
+ * 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.
+ */
+
+// a package is omitted to get declarations directly under the module
+package kotlin.wasm.internal
+
+import kotlin.reflect.*
+
+internal actual fun <T : Any> getKClassForObject(obj: Any): KClass<T> =
+    KClassImpl(getTypeInfoTypeDataByPtr(obj.typeInfo))