diff --git a/generators/nativeInteropRuntime/NativeInteropRuntimeGenerator.kt b/generators/nativeInteropRuntime/NativeInteropRuntimeGenerator.kt
index f9b5063b4de..cc86faa8761 100644
--- a/generators/nativeInteropRuntime/NativeInteropRuntimeGenerator.kt
+++ b/generators/nativeInteropRuntime/NativeInteropRuntimeGenerator.kt
@@ -31,6 +31,7 @@ fun FileWriter.generateAllocWithValue(type: PrimitiveInteropType) {
          * Allocates variable with given value type and initializes it with given value.
          */
         @Suppress("FINAL_UPPER_BOUND")
+        @ExperimentalForeignApi
         public fun <T : $typeName> NativePlacement.alloc(value: T): ${typeName}VarOf<T> =
                 alloc<${typeName}VarOf<T>> { this.value = value }
     """.trimIndent()
diff --git a/kotlin-native/Interop/Indexer/build.gradle.kts b/kotlin-native/Interop/Indexer/build.gradle.kts
index fbc56cad0c5..90e6732f0a3 100644
--- a/kotlin-native/Interop/Indexer/build.gradle.kts
+++ b/kotlin-native/Interop/Indexer/build.gradle.kts
@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
  */
 
 import org.jetbrains.kotlin.tools.lib
@@ -176,7 +165,12 @@ val compileKotlin: org.jetbrains.kotlin.gradle.tasks.KotlinCompile by tasks
 
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
     kotlinOptions {
-        freeCompilerArgs += listOf("-Xskip-prerelease-check")
+        freeCompilerArgs += listOf(
+                "-Xskip-prerelease-check",
+                "-opt-in=kotlinx.cinterop.BetaInteropApi",
+                "-opt-in=kotlinx.cinterop.ExperimentalForeignApi",
+        )
+
     }
 }
 
diff --git a/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt b/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt
index 9ec24a77b3f..6610ffa6ba5 100644
--- a/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt
+++ b/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt
@@ -14,7 +14,8 @@
  * limitations under the License.
  */
 
-@file:Suppress("DEPRECATION") // RetainForTarget
+@file:Suppress("DEPRECATION", "TYPEALIAS_EXPANSION_DEPRECATION") // Everything is scheduled for removal
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlinx.wasm.jsinterop
 
@@ -22,49 +23,66 @@ import kotlin.native.*
 import kotlin.native.internal.*
 import kotlinx.cinterop.*
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 typealias Arena = Int
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 typealias Object = Int
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 typealias Pointer = Int
 
+private const val WASM_TARGET_IS_DEPRECATED = "K/N WASM target and all related API is deprecated for removal. " +
+        "See https://blog.jetbrains.com/kotlin/2023/02/update-regarding-kotlin-native-targets for additional details"
+
 /**
  * @Retain annotation is required to preserve functions from internalization and DCE.
  */
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Konan_js_allocateArena")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun allocateArena(): Arena
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Konan_js_freeArena")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun freeArena(arena: Arena)
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Konan_js_pushIntToArena")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun pushIntToArena(arena: Arena, value: Int)
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 const val upperWord = 0xffffffff.toLong() shl 32
 
 @ExportForCppRuntime
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun doubleUpper(value: Double): Int =
     ((value.toBits() and upperWord) ushr 32) .toInt()
 
 @ExportForCppRuntime
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun doubleLower(value: Double): Int =
     (value.toBits() and 0x00000000ffffffff) .toInt()
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("ReturnSlot_getDouble")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun ReturnSlot_getDouble(): Double
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Kotlin_String_utf16pointer")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun stringPointer(message: String): Pointer
 
 @RetainForTarget("wasm32")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 @GCUnsafeCall("Kotlin_String_utf16length")
 external public fun stringLengthBytes(message: String): Int
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 typealias KtFunction <R> = ((ArrayList<JsValue>)->R)
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun <R> wrapFunction(func: KtFunction<R>): Int {
     val ptr: Long = StableRef.create(func).asCPointer().toLong() 
     return ptr.toInt() // TODO: LP64 unsafe.
@@ -72,6 +90,7 @@ fun <R> wrapFunction(func: KtFunction<R>): Int {
 
 @RetainForTarget("wasm32")
 @ExportForCppRuntime("Konan_js_runLambda")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun runLambda(pointer: Int, argumentsArena: Arena, argumentsArenaSize: Int): Int {
     val arguments = arrayListOf<JsValue>()
     for (i in 0 until argumentsArenaSize) {
@@ -87,6 +106,7 @@ fun runLambda(pointer: Int, argumentsArena: Arena, argumentsArenaSize: Int): Int
     return result.index
 }
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 open class JsValue(val arena: Arena, val index: Object) {
     fun getInt(property: String): Int {
         return getInt(ArenaManager.currentArena, index, stringPointer(property), stringLengthBytes(property))
@@ -96,6 +116,7 @@ open class JsValue(val arena: Arena, val index: Object) {
     }
 }
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 open class JsArray(arena: Arena, index: Object): JsValue(arena, index) {
     constructor(jsValue: JsValue): this(jsValue.arena, jsValue.index)        
     operator fun get(index: Int): JsValue {
@@ -108,37 +129,46 @@ open class JsArray(arena: Arena, index: Object): JsValue(arena, index) {
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Konan_js_getInt")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun getInt(arena: Arena, obj: Object, propertyPtr: Pointer, propertyLen: Int): Int;
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Konan_js_getProperty")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun Konan_js_getProperty(arena: Arena, obj: Object, propertyPtr: Pointer, propertyLen: Int): Int;
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Konan_js_setFunction")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun setFunction(arena: Arena, obj: Object, propertyName: Pointer, propertyLength: Int , function: Int)
 
 @RetainForTarget("wasm32")
 @GCUnsafeCall("Konan_js_setString")
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 external public fun setString(arena: Arena, obj: Object, propertyName: Pointer, propertyLength: Int, stringPtr: Pointer, stringLength: Int )
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun setter(obj: JsValue, property: String, string: String) {
     setString(obj.arena, obj.index, stringPointer(property), stringLengthBytes(property), stringPointer(string), stringLengthBytes(string))
 }
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun setter(obj: JsValue, property: String, lambda: KtFunction<Unit>) {
     val pointer = wrapFunction(lambda);
     setFunction(obj.arena, obj.index, stringPointer(property), stringLengthBytes(property), pointer)
 }
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun JsValue.setter(property: String, lambda: KtFunction<Unit>) {
     setter(this, property, lambda)
 }
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 fun JsValue.setter(property: String, string: String) {
     setter(this, property, string)
 }
 
+@Deprecated(WASM_TARGET_IS_DEPRECATED, level = DeprecationLevel.WARNING)
 object ArenaManager {
     val globalArena = allocateArena()
 
diff --git a/kotlin-native/Interop/Runtime/build.gradle.kts b/kotlin-native/Interop/Runtime/build.gradle.kts
index 2009a9df704..00050e4386a 100644
--- a/kotlin-native/Interop/Runtime/build.gradle.kts
+++ b/kotlin-native/Interop/Runtime/build.gradle.kts
@@ -1,18 +1,8 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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.
  */
+
 import org.jetbrains.kotlin.tools.lib
 import org.jetbrains.kotlin.tools.solib
 import org.jetbrains.kotlin.*
@@ -64,10 +54,13 @@ dependencies {
 
 sourceSets.main.get().java.srcDir("src/jvm/kotlin")
 
+
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
     kotlinOptions {
         freeCompilerArgs += listOf(
             "-opt-in=kotlin.ExperimentalUnsignedTypes",
+            "-opt-in=kotlinx.cinterop.BetaInteropApi",
+            "-opt-in=kotlinx.cinterop.ExperimentalForeignApi",
             "-Xskip-prerelease-check"
         )
     }
diff --git a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt
index f6ced80c008..96e0f6ac977 100644
--- a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt
+++ b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 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.
  */
 
@@ -8,11 +8,52 @@ package kotlinx.cinterop
 /**
  * Marker for declarations that depend on numeric types of different bit width on at least two platforms.
  *
- * @param actualPlatformTypes: Contains platform types represented as `{konanTarget}: {type fqn}`
+ * @param actualPlatformTypes Contains platform types represented as `{konanTarget}: {type fqn}`
  * e.g. ["linux_x64: kotlin.Int", "linux_arm64: kotlin.Long"]
  */
 @Suppress("unused") // Is emitted by the Commonizer
 @Target(AnnotationTarget.TYPEALIAS, AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY)
 @Retention(AnnotationRetention.BINARY)
 @RequiresOptIn(level = RequiresOptIn.Level.WARNING)
-annotation class UnsafeNumber(val actualPlatformTypes: Array<String>)
\ No newline at end of file
+public annotation class UnsafeNumber(val actualPlatformTypes: Array<String>)
+
+/**
+ * Marks Objective-C and Swift interoperability API as Beta.
+ *
+ * The marked API has official Beta stability level, is considered to be a vital part of Kotlin/Native
+ * and Kotlin Multiplatform, and is evolved in a backward-compatible manner with the proper migration paths for incompatible changes.
+ *
+ * It may partially lack the concise semantics, documentation, and API to interoperate with Swift and Objective-C features
+ * that do not have a direct Kotlin counterpart.
+ *
+ * This API is recommended to be used for interoperability purposes, but with the API availability scope confined and narrowed down.
+ */
+@Target(AnnotationTarget.TYPEALIAS, AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY,
+        AnnotationTarget.ANNOTATION_CLASS, AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.BINARY)
+@RequiresOptIn(level = RequiresOptIn.Level.WARNING)
+public annotation class BetaInteropApi
+
+/**
+ * Marks foreign-memory-related API as experimental.
+ *
+ * Foreign API includes all operations and classifiers that are required for operating with
+ * unmanaged and foreign memory, including but not limited to such declarations as [CPointer], [CPointed], [StableRef], and `Pinned`.
+ *
+ * Such API is considered experimental and has the following known limitations and caveats:
+ * - It is either undocumented or lacks extensive and sound description.
+ * - There is no clear behavioural semantics and explicit mapping between foreign (e.g. C-pointer) concepts
+ *     and the corresponding foreign API (e.g. [CPointer]). Such declarations might have an unsound mapping.
+ * - There is no clear semantic difference between similar declarations.
+ * - It lacks best practices and cookbook-like recommendations.
+ *
+ * ABI and API compatibilities are provided on a best-effort basis.
+ * We also do provide a best-effort migration path for binary/source incompatible changes, including the proper deprecation
+ * cycle, migration path, and introducing replacements for the API rather than API breakage.
+ *
+ * This API is recommended to be used for interoperability purposes, but with the API availability scope confined and narrowed down.
+ */
+@Target(AnnotationTarget.TYPEALIAS, AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY, AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.BINARY)
+@RequiresOptIn(level = RequiresOptIn.Level.ERROR)
+public annotation class ExperimentalForeignApi
diff --git a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Generated.kt b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Generated.kt
index 323811d4e53..d52673fd5a9 100644
--- a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Generated.kt
+++ b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Generated.kt
@@ -1,275 +1,326 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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.
  */
 
 @file:Suppress("FINAL_UPPER_BOUND", "NOTHING_TO_INLINE")
 
 package kotlinx.cinterop
 
+@ExperimentalForeignApi
 @JvmName("plus\$Byte")
 inline operator fun <T : ByteVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 1)
 
+@ExperimentalForeignApi
 @JvmName("plus\$Byte")
 inline operator fun <T : ByteVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$Byte")
 inline operator fun <T : Byte> CPointer<ByteVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Byte")
 inline operator fun <T : Byte> CPointer<ByteVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$Byte")
 inline operator fun <T : Byte> CPointer<ByteVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Byte")
 inline operator fun <T : Byte> CPointer<ByteVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$Short")
 inline operator fun <T : ShortVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 2)
 
+@ExperimentalForeignApi
 @JvmName("plus\$Short")
 inline operator fun <T : ShortVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$Short")
 inline operator fun <T : Short> CPointer<ShortVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Short")
 inline operator fun <T : Short> CPointer<ShortVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$Short")
 inline operator fun <T : Short> CPointer<ShortVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Short")
 inline operator fun <T : Short> CPointer<ShortVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$Int")
 inline operator fun <T : IntVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 4)
 
+@ExperimentalForeignApi
 @JvmName("plus\$Int")
 inline operator fun <T : IntVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$Int")
 inline operator fun <T : Int> CPointer<IntVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Int")
 inline operator fun <T : Int> CPointer<IntVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$Int")
 inline operator fun <T : Int> CPointer<IntVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Int")
 inline operator fun <T : Int> CPointer<IntVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$Long")
 inline operator fun <T : LongVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 8)
 
+@ExperimentalForeignApi
 @JvmName("plus\$Long")
 inline operator fun <T : LongVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$Long")
 inline operator fun <T : Long> CPointer<LongVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Long")
 inline operator fun <T : Long> CPointer<LongVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$Long")
 inline operator fun <T : Long> CPointer<LongVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Long")
 inline operator fun <T : Long> CPointer<LongVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$UByte")
 inline operator fun <T : UByteVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 1)
 
+@ExperimentalForeignApi
 @JvmName("plus\$UByte")
 inline operator fun <T : UByteVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$UByte")
 inline operator fun <T : UByte> CPointer<UByteVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : UByte> CPointer<UByteVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 inline operator fun <T : UByte> CPointer<UByteVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : UByte> CPointer<UByteVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$UShort")
 inline operator fun <T : UShortVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 2)
 
+@ExperimentalForeignApi
 @JvmName("plus\$UShort")
 inline operator fun <T : UShortVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$UShort")
 inline operator fun <T : UShort> CPointer<UShortVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : UShort> CPointer<UShortVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$UShort")
 inline operator fun <T : UShort> CPointer<UShortVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : UShort> CPointer<UShortVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$UInt")
 inline operator fun <T : UIntVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 4)
 
+@ExperimentalForeignApi
 @JvmName("plus\$UInt")
 inline operator fun <T : UIntVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$UInt")
 inline operator fun <T : UInt> CPointer<UIntVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : UInt> CPointer<UIntVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$UInt")
 inline operator fun <T : UInt> CPointer<UIntVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : UInt> CPointer<UIntVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$ULong")
 inline operator fun <T : ULongVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 8)
 
+@ExperimentalForeignApi
 @JvmName("plus\$ULong")
 inline operator fun <T : ULongVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$ULong")
 inline operator fun <T : ULong> CPointer<ULongVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : ULong> CPointer<ULongVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$ULong")
 inline operator fun <T : ULong> CPointer<ULongVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 inline operator fun <T : ULong> CPointer<ULongVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$Float")
 inline operator fun <T : FloatVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 4)
 
+@ExperimentalForeignApi
 @JvmName("plus\$Float")
 inline operator fun <T : FloatVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$Float")
 inline operator fun <T : Float> CPointer<FloatVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Float")
 inline operator fun <T : Float> CPointer<FloatVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$Float")
 inline operator fun <T : Float> CPointer<FloatVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Float")
 inline operator fun <T : Float> CPointer<FloatVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("plus\$Double")
 inline operator fun <T : DoubleVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * 8)
 
+@ExperimentalForeignApi
 @JvmName("plus\$Double")
 inline operator fun <T : DoubleVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @JvmName("get\$Double")
 inline operator fun <T : Double> CPointer<DoubleVarOf<T>>.get(index: Int): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Double")
 inline operator fun <T : Double> CPointer<DoubleVarOf<T>>.set(index: Int, value: T) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @JvmName("get\$Double")
 inline operator fun <T : Double> CPointer<DoubleVarOf<T>>.get(index: Long): T =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @JvmName("set\$Double")
 inline operator fun <T : Double> CPointer<DoubleVarOf<T>>.set(index: Long, value: T) {
     (this + index)!!.pointed.value = value
 }
 
-/* Generated by:
+/* Seva: Used to be generated by:
+
+Seva: It probably means the reasoning of this API and is general applicability should be revisited
 
 #!/bin/bash
 
diff --git a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/StableRef.kt b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/StableRef.kt
index 727dbe9f469..e37cbac959e 100644
--- a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/StableRef.kt
+++ b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/StableRef.kt
@@ -1,24 +1,10 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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 kotlinx.cinterop
 
-@Deprecated("Use StableRef<T> instead", ReplaceWith("StableRef<T>"), DeprecationLevel.ERROR)
-typealias StableObjPtr = StableRef<*>
-
 /**
  * This class provides a way to create a stable handle to any Kotlin object.
  * After [converting to CPointer][asCPointer] it can be safely passed to native code e.g. to be received
@@ -28,6 +14,7 @@ typealias StableObjPtr = StableRef<*>
  */
 @Suppress("NON_PUBLIC_PRIMARY_CONSTRUCTOR_OF_INLINE_CLASS")
 @kotlin.jvm.JvmInline
+@ExperimentalForeignApi
 public value class StableRef<out T : Any> @PublishedApi internal constructor(
         private val stablePtr: COpaquePointer
 ) {
@@ -39,17 +26,7 @@ public value class StableRef<out T : Any> @PublishedApi internal constructor(
          */
         fun <T : Any> create(any: T) = StableRef<T>(createStablePointer(any))
 
-        /**
-         * Creates [StableRef] from given raw value.
-         *
-         * @param value must be a [value] of some [StableRef]
-         */
-        @Deprecated("Use CPointer<*>.asStableRef<T>() instead", ReplaceWith("ptr.asStableRef<T>()"),
-                DeprecationLevel.ERROR)
-        fun fromValue(value: COpaquePointer) = value.asStableRef<Any>()
     }
-    @Deprecated("Use .asCPointer() instead", ReplaceWith("this.asCPointer()"), DeprecationLevel.ERROR)
-    val value: COpaquePointer get() = this.asCPointer()
 
     /**
      * Converts the handle to C pointer.
@@ -75,4 +52,5 @@ public value class StableRef<out T : Any> @PublishedApi internal constructor(
 /**
  * Converts to [StableRef] this opaque pointer produced by [StableRef.asCPointer].
  */
+@ExperimentalForeignApi
 inline fun <reified T : Any> CPointer<*>.asStableRef(): StableRef<T> = StableRef<T>(this).also { it.get() }
diff --git a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Types.kt b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Types.kt
index e338c4928f9..7c4901ef85e 100644
--- a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Types.kt
+++ b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Types.kt
@@ -1,21 +1,12 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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 kotlinx.cinterop
 
+import kotlin.native.*
+
 /**
  * The entity which has an associated native pointer.
  * Subtypes are supposed to represent interpretations of the pointed data or code.
@@ -24,12 +15,14 @@ package kotlinx.cinterop
  *
  * TODO: the behavior of [equals], [hashCode] and [toString] differs on Native and JVM backends.
  */
+@ExperimentalForeignApi
 public open class NativePointed internal constructor(rawPtr: NonNullNativePtr) {
     var rawPtr = rawPtr.toNativePtr()
         internal set
 }
 
 // `null` value of `NativePointed?` is mapped to `nativeNullPtr`.
+@ExperimentalForeignApi
 public val NativePointed?.rawPtr: NativePtr
     get() = if (this != null) this.rawPtr else nativeNullPtr
 
@@ -38,21 +31,27 @@ public val NativePointed?.rawPtr: NativePtr
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline fun <reified T : NativePointed> interpretPointed(ptr: NativePtr): T = interpretNullablePointed<T>(ptr)!!
 
+@ExperimentalForeignApi
 private class OpaqueNativePointed(rawPtr: NativePtr) : NativePointed(rawPtr.toNonNull())
 
+@ExperimentalForeignApi
 public fun interpretOpaquePointed(ptr: NativePtr): NativePointed = interpretPointed<OpaqueNativePointed>(ptr)
+@ExperimentalForeignApi
 public fun interpretNullableOpaquePointed(ptr: NativePtr): NativePointed? = interpretNullablePointed<OpaqueNativePointed>(ptr)
 
 /**
  * Changes the interpretation of the pointed data or code.
  */
+@ExperimentalForeignApi
 public inline fun <reified T : NativePointed> NativePointed.reinterpret(): T = interpretPointed(this.rawPtr)
 
 /**
  * C data or code.
  */
+@ExperimentalForeignApi
 public abstract class CPointed(rawPtr: NativePtr) : NativePointed(rawPtr.toNonNull())
 
 /**
@@ -64,9 +63,10 @@ public abstract class CPointed(rawPtr: NativePtr) : NativePointed(rawPtr.toNonNu
  * Passing [CValues] has nearly the same semantics as passing by value: the C function receives
  * the pointer to the temporary copy of these values, and the caller can't observe the modifications to this copy.
  * The copy is valid until the C function returns.
- * There are also other implementations of [CValuesRef] that provide temporary pointer,
+ * There are other implementations of [CValuesRef] that provide temporary pointer,
  * e.g. Kotlin Native specific [refTo] functions to pass primitive arrays directly to native.
  */
+@ExperimentalForeignApi
 public abstract class CValuesRef<T : CPointed> {
     /**
      * If this reference is [CPointer], returns this pointer, otherwise
@@ -79,6 +79,7 @@ public abstract class CValuesRef<T : CPointed> {
  * The (possibly empty) sequence of immutable C values.
  * It is self-contained and doesn't depend on native memory.
  */
+@ExperimentalForeignApi
 public abstract class CValues<T : CVariable> : CValuesRef<T>() {
     /**
      * Copies the values to [placement] and returns the pointer to the copy.
@@ -126,6 +127,7 @@ public abstract class CValues<T : CVariable> : CValuesRef<T>() {
     public abstract fun place(placement: CPointer<T>): CPointer<T>
 }
 
+@ExperimentalForeignApi
 public fun <T : CVariable> CValues<T>.placeTo(scope: AutofreeScope) = this.getPointer(scope)
 
 /**
@@ -134,11 +136,13 @@ public fun <T : CVariable> CValues<T>.placeTo(scope: AutofreeScope) = this.getPo
  *
  * TODO: consider providing an adapter instead of subtyping [CValues].
  */
+@ExperimentalForeignApi
 public abstract class CValue<T : CVariable> : CValues<T>()
 
 /**
  * C pointer.
  */
+@ExperimentalForeignApi
 public class CPointer<T : CPointed> internal constructor(@PublishedApi internal val value: NonNullNativePtr) : CValuesRef<T>() {
 
     // TODO: replace by [value].
@@ -165,6 +169,7 @@ public class CPointer<T : CPointed> internal constructor(@PublishedApi internal
 /**
  * Returns the pointer to this data or code.
  */
+@ExperimentalForeignApi
 public val <T : CPointed> T.ptr: CPointer<T>
     get() = interpretCPointer(this.rawPtr)!!
 
@@ -173,32 +178,47 @@ public val <T : CPointed> T.ptr: CPointer<T>
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline val <reified T : CPointed> CPointer<T>.pointed: T
     get() = interpretPointed<T>(this.rawValue)
 
 // `null` value of `CPointer?` is mapped to `nativeNullPtr`
+@ExperimentalForeignApi
 public val CPointer<*>?.rawValue: NativePtr
     get() = if (this != null) this.rawValue else nativeNullPtr
 
+@ExperimentalForeignApi
 public fun <T : CPointed> CPointer<*>.reinterpret(): CPointer<T> = interpretCPointer(this.rawValue)!!
 
+@ExperimentalForeignApi
 public fun <T : CPointed> CPointer<T>?.toLong() = this.rawValue.toLong()
 
+@ExperimentalForeignApi
 public fun <T : CPointed> Long.toCPointer(): CPointer<T>? = interpretCPointer(nativeNullPtr + this)
 
 /**
  * The [CPointed] without any specified interpretation.
  */
+@ExperimentalForeignApi
 public abstract class COpaque(rawPtr: NativePtr) : CPointed(rawPtr) // TODO: should it correspond to COpaquePointer?
 
 /**
  * The pointer with an opaque type.
  */
-public typealias COpaquePointer = CPointer<out CPointed> // FIXME
+@OptIn(ExperimentalForeignApi::class)
+/*
+ * This typealias should be marked as @ExperimentalForeignApi
+ * but such marking starts crashing the compiler (due to typealias handling bug).
+ * We are not blocked by this behaviour because any declaration mentioning
+ * `COpaquePointer` will trigger `ExperimentalForeignApi` error due to typealias expansion
+ * in opt-in propagation mechanism.
+ */
+public typealias COpaquePointer = CPointer<out CPointed> // FIXME (the comment is about the typealias, not its opt-in annotation)
 
 /**
  * The variable containing a [COpaquePointer].
  */
+@ExperimentalForeignApi
 public typealias COpaquePointerVar = CPointerVarOf<COpaquePointer>
 
 /**
@@ -207,6 +227,7 @@ public typealias COpaquePointerVar = CPointerVarOf<COpaquePointer>
  * The non-abstract subclasses should represent the (complete) C data type and thus specify size and alignment.
  * Each such subclass must have a companion object which is a [Type].
  */
+@ExperimentalForeignApi
 public abstract class CVariable(rawPtr: NativePtr) : CPointed(rawPtr) {
 
     /**
@@ -227,18 +248,22 @@ public abstract class CVariable(rawPtr: NativePtr) : CPointed(rawPtr) {
 }
 
 @Suppress("DEPRECATION")
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> sizeOf() = typeOf<T>().size
 
 @Suppress("DEPRECATION")
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> alignOf() = typeOf<T>().align
 
 /**
  * Returns the member of this [CStructVar] which is located by given offset in bytes.
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CPointed> CStructVar.memberAt(offset: Long): T {
     return interpretPointed<T>(this.rawPtr + offset)
 }
 
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> CStructVar.arrayMemberAt(offset: Long): CArrayPointer<T> {
     return interpretCPointer<T>(this.rawPtr + offset)!!
 }
@@ -246,6 +271,7 @@ public inline fun <reified T : CVariable> CStructVar.arrayMemberAt(offset: Long)
 /**
  * The C struct-typed variable located in memory.
  */
+@ExperimentalForeignApi
 public abstract class CStructVar(rawPtr: NativePtr) : CVariable(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
     @Suppress("DEPRECATION")
@@ -255,6 +281,7 @@ public abstract class CStructVar(rawPtr: NativePtr) : CVariable(rawPtr) {
 /**
  * The C primitive-typed variable located in memory.
  */
+@ExperimentalForeignApi
 sealed class CPrimitiveVar(rawPtr: NativePtr) : CVariable(rawPtr) {
     // aligning by size is obviously enough
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -267,11 +294,13 @@ public interface CEnum {
     public val value: Any
 }
 
+@ExperimentalForeignApi
 public abstract class CEnumVar(rawPtr: NativePtr) : CPrimitiveVar(rawPtr)
 
 // generics below are used for typedef support
 // these classes are not supposed to be used directly, instead the typealiases are provided.
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class BooleanVarOf<T : Boolean>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -279,6 +308,7 @@ public class BooleanVarOf<T : Boolean>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr
     companion object : Type(1)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class ByteVarOf<T : Byte>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -286,6 +316,7 @@ public class ByteVarOf<T : Byte>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(1)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class ShortVarOf<T : Short>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -293,6 +324,7 @@ public class ShortVarOf<T : Short>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(2)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class IntVarOf<T : Int>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -300,6 +332,7 @@ public class IntVarOf<T : Int>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(4)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class LongVarOf<T : Long>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -307,6 +340,7 @@ public class LongVarOf<T : Long>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(8)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class UByteVarOf<T : UByte>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -314,6 +348,7 @@ public class UByteVarOf<T : UByte>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(1)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class UShortVarOf<T : UShort>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -321,6 +356,7 @@ public class UShortVarOf<T : UShort>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr)
     companion object : Type(2)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class UIntVarOf<T : UInt>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -328,6 +364,7 @@ public class UIntVarOf<T : UInt>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(4)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class ULongVarOf<T : ULong>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -335,6 +372,7 @@ public class ULongVarOf<T : ULong>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(8)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class FloatVarOf<T : Float>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -342,6 +380,7 @@ public class FloatVarOf<T : Float>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     companion object : Type(4)
 }
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class DoubleVarOf<T : Double>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -349,18 +388,30 @@ public class DoubleVarOf<T : Double>(rawPtr: NativePtr) : CPrimitiveVar(rawPtr)
     companion object : Type(8)
 }
 
+@ExperimentalForeignApi
 public typealias BooleanVar = BooleanVarOf<Boolean>
+@ExperimentalForeignApi
 public typealias ByteVar = ByteVarOf<Byte>
+@ExperimentalForeignApi
 public typealias ShortVar = ShortVarOf<Short>
+@ExperimentalForeignApi
 public typealias IntVar = IntVarOf<Int>
+@ExperimentalForeignApi
 public typealias LongVar = LongVarOf<Long>
+@ExperimentalForeignApi
 public typealias UByteVar = UByteVarOf<UByte>
+@ExperimentalForeignApi
 public typealias UShortVar = UShortVarOf<UShort>
+@ExperimentalForeignApi
 public typealias UIntVar = UIntVarOf<UInt>
+@ExperimentalForeignApi
 public typealias ULongVar = ULongVarOf<ULong>
+@ExperimentalForeignApi
 public typealias FloatVar = FloatVarOf<Float>
+@ExperimentalForeignApi
 public typealias DoubleVar = DoubleVarOf<Double>
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Boolean> BooleanVarOf<T>.value: T
     get() {
@@ -369,47 +420,59 @@ public var <T : Boolean> BooleanVarOf<T>.value: T
     }
     set(value) = nativeMemUtils.putByte(this, value.toByte())
 
+// TODO remove these boolean <-> byte declarations
+
 @Suppress("NOTHING_TO_INLINE")
+@ExperimentalForeignApi
 public inline fun Boolean.toByte(): Byte = if (this) 1 else 0
 
 @Suppress("NOTHING_TO_INLINE")
+@ExperimentalForeignApi
 public inline fun Byte.toBoolean() = (this.toInt() != 0)
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Byte> ByteVarOf<T>.value: T
     get() = nativeMemUtils.getByte(this) as T
     set(value) = nativeMemUtils.putByte(this, value)
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Short> ShortVarOf<T>.value: T
     get() = nativeMemUtils.getShort(this) as T
     set(value) = nativeMemUtils.putShort(this, value)
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Int> IntVarOf<T>.value: T
     get() = nativeMemUtils.getInt(this) as T
     set(value) = nativeMemUtils.putInt(this, value)
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Long> LongVarOf<T>.value: T
     get() = nativeMemUtils.getLong(this) as T
     set(value) = nativeMemUtils.putLong(this, value)
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : UByte> UByteVarOf<T>.value: T
     get() = nativeMemUtils.getByte(this).toUByte() as T
     set(value) = nativeMemUtils.putByte(this, value.toByte())
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : UShort> UShortVarOf<T>.value: T
     get() = nativeMemUtils.getShort(this).toUShort() as T
     set(value) = nativeMemUtils.putShort(this, value.toShort())
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : UInt> UIntVarOf<T>.value: T
     get() = nativeMemUtils.getInt(this).toUInt() as T
     set(value) = nativeMemUtils.putInt(this, value.toInt())
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : ULong> ULongVarOf<T>.value: T
     get() = nativeMemUtils.getLong(this).toULong() as T
@@ -417,17 +480,20 @@ public var <T : ULong> ULongVarOf<T>.value: T
 
 // TODO: ensure native floats have the appropriate binary representation
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Float> FloatVarOf<T>.value: T
     get() = nativeMemUtils.getFloat(this) as T
     set(value) = nativeMemUtils.putFloat(this, value)
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Double> DoubleVarOf<T>.value: T
     get() = nativeMemUtils.getDouble(this) as T
     set(value) = nativeMemUtils.putDouble(this, value)
 
 
+@ExperimentalForeignApi
 public class CPointerVarOf<T : CPointer<*>>(rawPtr: NativePtr) : CVariable(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
     @Suppress("DEPRECATION")
@@ -437,11 +503,13 @@ public class CPointerVarOf<T : CPointer<*>>(rawPtr: NativePtr) : CVariable(rawPt
 /**
  * The C data variable containing the pointer to `T`.
  */
+@ExperimentalForeignApi
 public typealias CPointerVar<T> = CPointerVarOf<CPointer<T>>
 
 /**
  * The value of this variable.
  */
+@ExperimentalForeignApi
 @Suppress("UNCHECKED_CAST")
 public inline var <P : CPointer<*>> CPointerVarOf<P>.value: P?
     get() = interpretCPointer<CPointed>(nativeMemUtils.getNativePtr(this)) as P?
@@ -449,15 +517,17 @@ public inline var <P : CPointer<*>> CPointerVarOf<P>.value: P?
 
 /**
  * The code or data pointed by the value of this variable.
- * 
+ *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline var <reified T : CPointed, reified P : CPointer<T>> CPointerVarOf<P>.pointed: T?
     get() = this.value?.pointed
     set(value) {
         this.value = value?.ptr as P?
     }
 
+@ExperimentalForeignApi
 public inline operator fun <reified T : CVariable> CPointer<T>.get(index: Long): T {
     val offset = if (index == 0L) {
         0L // optimization for JVM impl which uses reflection for now.
@@ -467,40 +537,50 @@ public inline operator fun <reified T : CVariable> CPointer<T>.get(index: Long):
     return interpretPointed(this.rawValue + offset)
 }
 
+@ExperimentalForeignApi
 public inline operator fun <reified T : CVariable> CPointer<T>.get(index: Int): T = this.get(index.toLong())
 
+@ExperimentalForeignApi
 @Suppress("NOTHING_TO_INLINE")
 @JvmName("plus\$CPointer")
 public inline operator fun <T : CPointerVarOf<*>> CPointer<T>?.plus(index: Long): CPointer<T>? =
         interpretCPointer(this.rawValue + index * pointerSize)
 
+@ExperimentalForeignApi
 @Suppress("NOTHING_TO_INLINE")
 @JvmName("plus\$CPointer")
 public inline operator fun <T : CPointerVarOf<*>> CPointer<T>?.plus(index: Int): CPointer<T>? =
         this + index.toLong()
 
+@ExperimentalForeignApi
 @Suppress("NOTHING_TO_INLINE")
 public inline operator fun <T : CPointer<*>> CPointer<CPointerVarOf<T>>.get(index: Int): T? =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @Suppress("NOTHING_TO_INLINE")
 public inline operator fun <T : CPointer<*>> CPointer<CPointerVarOf<T>>.set(index: Int, value: T?) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 @Suppress("NOTHING_TO_INLINE")
 public inline operator fun <T : CPointer<*>> CPointer<CPointerVarOf<T>>.get(index: Long): T? =
         (this + index)!!.pointed.value
 
+@ExperimentalForeignApi
 @Suppress("NOTHING_TO_INLINE")
 public inline operator fun <T : CPointer<*>> CPointer<CPointerVarOf<T>>.set(index: Long, value: T?) {
     (this + index)!!.pointed.value = value
 }
 
+@ExperimentalForeignApi
 public typealias CArrayPointer<T> = CPointer<T>
+@ExperimentalForeignApi
 public typealias CArrayPointerVar<T> = CPointerVar<T>
 
 /**
  * The C function.
  */
+@ExperimentalForeignApi
 public class CFunction<T : Function<*>>(rawPtr: NativePtr) : CPointed(rawPtr)
diff --git a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Utils.kt b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Utils.kt
index 9f6e9b67e33..b049b292b4a 100644
--- a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Utils.kt
+++ b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Utils.kt
@@ -1,21 +1,11 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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 kotlinx.cinterop
 
+@ExperimentalForeignApi
 public interface NativePlacement {
 
     public fun alloc(size: Long, align: Int): NativePointed
@@ -23,21 +13,27 @@ public interface NativePlacement {
     public fun alloc(size: Int, align: Int): NativePointed = alloc(size.toLong(), align)
 }
 
+@ExperimentalForeignApi
 public interface NativeFreeablePlacement : NativePlacement {
     public fun free(mem: NativePtr)
 }
 
+@ExperimentalForeignApi
 public fun NativeFreeablePlacement.free(pointer: CPointer<*>) = this.free(pointer.rawValue)
+@ExperimentalForeignApi
 public fun NativeFreeablePlacement.free(pointed: NativePointed) = this.free(pointed.rawPtr)
 
+@ExperimentalForeignApi
 public object nativeHeap : NativeFreeablePlacement {
     override fun alloc(size: Long, align: Int) = nativeMemUtils.alloc(size, align)
 
     override fun free(mem: NativePtr) = nativeMemUtils.free(mem)
 }
 
+@ExperimentalForeignApi
 private typealias Deferred = () -> Unit
 
+@ExperimentalForeignApi
 public open class DeferScope {
 
     @PublishedApi
@@ -65,10 +61,12 @@ public open class DeferScope {
     }
 }
 
+@ExperimentalForeignApi
 public abstract class AutofreeScope : DeferScope(), NativePlacement {
     abstract override fun alloc(size: Long, align: Int): NativePointed
 }
 
+@ExperimentalForeignApi
 public open class ArenaBase(private val parent: NativeFreeablePlacement = nativeHeap) : AutofreeScope() {
 
     private var lastChunk: NativePointed? = null
@@ -97,6 +95,7 @@ public open class ArenaBase(private val parent: NativeFreeablePlacement = native
 
 }
 
+@ExperimentalForeignApi
 public class Arena(parent: NativeFreeablePlacement = nativeHeap) : ArenaBase(parent) {
     fun clear() = this.clearImpl()
 }
@@ -106,12 +105,14 @@ public class Arena(parent: NativeFreeablePlacement = nativeHeap) : ArenaBase(par
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> NativePlacement.alloc(): T =
         @Suppress("DEPRECATION")
         alloc(typeOf<T>()).reinterpret()
 
 @PublishedApi
 @Suppress("DEPRECATION")
+@ExperimentalForeignApi
 internal fun NativePlacement.alloc(type: CVariable.Type): NativePointed =
         alloc(type.size, type.align)
 
@@ -120,6 +121,7 @@ internal fun NativePlacement.alloc(type: CVariable.Type): NativePointed =
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> NativePlacement.alloc(initialize: T.() -> Unit): T =
         alloc<T>().also { it.initialize() }
 
@@ -128,6 +130,7 @@ public inline fun <reified T : CVariable> NativePlacement.alloc(initialize: T.()
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> NativePlacement.allocArray(length: Long): CArrayPointer<T> =
         alloc(sizeOf<T>() * length, alignOf<T>()).reinterpret<T>().ptr
 
@@ -136,6 +139,7 @@ public inline fun <reified T : CVariable> NativePlacement.allocArray(length: Lon
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> NativePlacement.allocArray(length: Int): CArrayPointer<T> =
         allocArray(length.toLong())
 
@@ -144,6 +148,7 @@ public inline fun <reified T : CVariable> NativePlacement.allocArray(length: Int
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> NativePlacement.allocArray(length: Long,
                                                               initializer: T.(index: Long)->Unit): CArrayPointer<T> {
     val res = allocArray<T>(length)
@@ -160,6 +165,7 @@ public inline fun <reified T : CVariable> NativePlacement.allocArray(length: Lon
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> NativePlacement.allocArray(
         length: Int, initializer: T.(index: Int)->Unit): CArrayPointer<T> = allocArray(length.toLong()) { index ->
             this.initializer(index.toInt())
@@ -169,6 +175,7 @@ public inline fun <reified T : CVariable> NativePlacement.allocArray(
 /**
  * Allocates C array of pointers to given elements.
  */
+@ExperimentalForeignApi
 public fun <T : CPointed> NativePlacement.allocArrayOfPointersTo(elements: List<T?>): CArrayPointer<CPointerVar<T>> {
     val res = allocArray<CPointerVar<T>>(elements.size)
     elements.forEachIndexed { index, value ->
@@ -180,12 +187,14 @@ public fun <T : CPointed> NativePlacement.allocArrayOfPointersTo(elements: List<
 /**
  * Allocates C array of pointers to given elements.
  */
+@ExperimentalForeignApi
 public fun <T : CPointed> NativePlacement.allocArrayOfPointersTo(vararg elements: T?) =
         allocArrayOfPointersTo(listOf(*elements))
 
 /**
  * Allocates C array of given values.
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CPointer<*>>
         NativePlacement.allocArrayOf(vararg elements: T?): CArrayPointer<CPointerVarOf<T>> {
     return allocArrayOf(listOf(*elements))
@@ -194,6 +203,7 @@ public inline fun <reified T : CPointer<*>>
 /**
  * Allocates C array of given values.
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CPointer<*>>
         NativePlacement.allocArrayOf(elements: List<T?>): CArrayPointer<CPointerVarOf<T>> {
 
@@ -206,12 +216,14 @@ public inline fun <reified T : CPointer<*>>
     return res
 }
 
+@ExperimentalForeignApi
 public fun NativePlacement.allocArrayOf(elements: ByteArray): CArrayPointer<ByteVar> {
     val result = allocArray<ByteVar>(elements.size)
     nativeMemUtils.putByteArray(elements, result.pointed, elements.size)
     return result
 }
 
+@ExperimentalForeignApi
 public fun NativePlacement.allocArrayOf(vararg elements: Float): CArrayPointer<FloatVar> {
     val res = allocArray<FloatVar>(elements.size)
     var index = 0
@@ -222,10 +234,12 @@ public fun NativePlacement.allocArrayOf(vararg elements: Float): CArrayPointer<F
     return res
 }
 
+@ExperimentalForeignApi
 public fun <T : CPointed> NativePlacement.allocPointerTo() = alloc<CPointerVar<T>>()
 
 @PublishedApi
-internal class ZeroValue<T: CVariable>(private val sizeBytes: Int, private val alignBytes: Int): CValue<T>() {
+@ExperimentalForeignApi
+internal class ZeroValue<T : CVariable>(private val sizeBytes: Int, private val alignBytes: Int) : CValue<T>() {
     // Optimization to avoid unneeded virtual calls in base class implementation.
     override fun getPointer(scope: AutofreeScope): CPointer<T> {
         return place(interpretCPointer(scope.alloc(size, align).rawPtr)!!)
@@ -241,12 +255,16 @@ internal class ZeroValue<T: CVariable>(private val sizeBytes: Int, private val a
 
 }
 @Suppress("NOTHING_TO_INLINE")
+@ExperimentalForeignApi
 public inline fun <T : CVariable> zeroValue(size: Int, align: Int): CValue<T> = ZeroValue(size, align)
 
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> zeroValue(): CValue<T> = zeroValue<T>(sizeOf<T>().toInt(), alignOf<T>())
 
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> cValue(): CValue<T> = zeroValue<T>()
 
+@ExperimentalForeignApi
 public fun <T : CVariable> CPointed.readValues(size: Int, align: Int): CValues<T> {
     val bytes = ByteArray(size)
     nativeMemUtils.getByteArray(this, bytes, size)
@@ -265,9 +283,11 @@ public fun <T : CVariable> CPointed.readValues(size: Int, align: Int): CValues<T
     }
 }
 
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> T.readValues(count: Int): CValues<T> =
         this.readValues<T>(size = count * sizeOf<T>().toInt(), align = alignOf<T>())
 
+@ExperimentalForeignApi
 public fun <T : CVariable> CPointed.readValue(size: Long, align: Int): CValue<T> {
     val bytes = ByteArray(size.toInt())
     nativeMemUtils.getByteArray(this, bytes, size.toInt())
@@ -287,19 +307,24 @@ public fun <T : CVariable> CPointed.readValue(size: Long, align: Int): CValue<T>
 }
 
 @Suppress("DEPRECATION")
-@PublishedApi internal fun <T : CVariable> CPointed.readValue(type: CVariable.Type): CValue<T> =
-    readValue(type.size, type.align)
+@PublishedApi
+@ExperimentalForeignApi
+internal fun <T : CVariable> CPointed.readValue(type: CVariable.Type): CValue<T> =
+        readValue(type.size, type.align)
 
 // Note: can't be declared as property due to possible clash with a struct field.
 // TODO: find better name.
 @Suppress("DEPRECATION")
+@ExperimentalForeignApi
 public inline fun <reified T : CStructVar> T.readValue(): CValue<T> = this.readValue(typeOf<T>())
 
-public fun <T: CVariable> CValue<T>.write(location: NativePtr) {
+@ExperimentalForeignApi
+public fun <T : CVariable> CValue<T>.write(location: NativePtr) {
     this.place(interpretCPointer(location)!!)
 }
 
 // TODO: optimize
+@ExperimentalForeignApi
 public fun <T : CVariable> CValues<T>.getBytes(): ByteArray = memScoped {
     val result = ByteArray(size)
     nativeMemUtils.getByteArray(
@@ -313,18 +338,22 @@ public fun <T : CVariable> CValues<T>.getBytes(): ByteArray = memScoped {
 /**
  * Calls the [block] with temporary copy of this value as receiver.
  */
+@ExperimentalForeignApi
 public inline fun <reified T : CStructVar, R> CValue<T>.useContents(block: T.() -> R): R = memScoped {
     this@useContents.placeTo(memScope).pointed.block()
 }
 
+@ExperimentalForeignApi
 public inline fun <reified T : CStructVar> CValue<T>.copy(modify: T.() -> Unit): CValue<T> = useContents {
     this.modify()
     this.readValue()
 }
 
+@ExperimentalForeignApi
 public inline fun <reified T : CStructVar> cValue(initialize: T.() -> Unit): CValue<T> =
     zeroValue<T>().copy(modify = initialize)
 
+@ExperimentalForeignApi
 public inline fun <reified T : CVariable> createValues(count: Int, initializer: T.(index: Int) -> Unit) = memScoped {
     val array = allocArray<T>(count, initializer)
     array[0].readValues(count)
@@ -334,7 +363,8 @@ public inline fun <reified T : CVariable> createValues(count: Int, initializer:
 /**
  * Returns sequence of immutable values [CValues] to pass them to C code.
  */
-fun cValuesOf(vararg elements: Byte): CValues<ByteVar> = object : CValues<ByteVar>() {
+@ExperimentalForeignApi
+public fun cValuesOf(vararg elements: Byte): CValues<ByteVar> = object : CValues<ByteVar>() {
     // Optimization to avoid unneeded virtual calls in base class implementation.
     override fun getPointer(scope: AutofreeScope): CPointer<ByteVar> {
         return place(interpretCPointer(scope.alloc(size, align).rawPtr)!!)
@@ -348,34 +378,49 @@ fun cValuesOf(vararg elements: Byte): CValues<ByteVar> = object : CValues<ByteVa
     override val align get() = 1
 }
 
+@ExperimentalForeignApi
 public fun cValuesOf(vararg elements: Short): CValues<ShortVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 public fun cValuesOf(vararg elements: Int): CValues<IntVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 public fun cValuesOf(vararg elements: Long): CValues<LongVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 public fun cValuesOf(vararg elements: Float): CValues<FloatVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 public fun cValuesOf(vararg elements: Double): CValues<DoubleVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 public fun <T : CPointed> cValuesOf(vararg elements: CPointer<T>?): CValues<CPointerVar<T>> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 public fun ByteArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 public fun ShortArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 public fun IntArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 public fun LongArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 public fun FloatArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 public fun DoubleArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 public fun <T : CPointed> Array<CPointer<T>?>.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 public fun <T : CPointed> List<CPointer<T>?>.toCValues() = this.toTypedArray().toCValues()
 
-private class CString(val bytes: ByteArray): CValues<ByteVar>() {
+@ExperimentalForeignApi
+private class CString(val bytes: ByteArray) : CValues<ByteVar>() {
     override val size get() = bytes.size + 1
     override val align get() = 1
 
@@ -390,7 +435,8 @@ private class CString(val bytes: ByteArray): CValues<ByteVar>() {
     }
 }
 
-private object EmptyCString: CValues<ByteVar>() {
+@ExperimentalForeignApi
+private object EmptyCString : CValues<ByteVar>() {
     override val size get() = 1
     override val align get() = 1
 
@@ -402,6 +448,7 @@ private object EmptyCString: CValues<ByteVar>() {
     override fun getPointer(scope: AutofreeScope): CPointer<ByteVar> {
         return placement
     }
+
     override fun place(placement: CPointer<ByteVar>): CPointer<ByteVar> {
         placement[0] = 0.toByte()
         return placement
@@ -411,12 +458,14 @@ private object EmptyCString: CValues<ByteVar>() {
 /**
  * @return the value of zero-terminated UTF-8-encoded C string constructed from given [kotlin.String].
  */
+@ExperimentalForeignApi
 public val String.cstr: CValues<ByteVar>
     get() = if (isEmpty()) EmptyCString else CString(encodeToUtf8(this))
 
 /**
  * @return the value of zero-terminated UTF-8-encoded C string constructed from given [kotlin.String].
  */
+@ExperimentalForeignApi
 public val String.utf8: CValues<ByteVar>
     get() = CString(encodeToUtf8(this))
 
@@ -424,6 +473,7 @@ public val String.utf8: CValues<ByteVar>
  * Convert this list of Kotlin strings to C array of C strings,
  * allocating memory for the array and C strings with given [AutofreeScope].
  */
+@ExperimentalForeignApi
 public fun List<String>.toCStringArray(autofreeScope: AutofreeScope): CPointer<CPointerVar<ByteVar>> =
         autofreeScope.allocArrayOf(this.map { it.cstr.getPointer(autofreeScope) })
 
@@ -431,10 +481,12 @@ public fun List<String>.toCStringArray(autofreeScope: AutofreeScope): CPointer<C
  * Convert this array of Kotlin strings to C array of C strings,
  * allocating memory for the array and C strings with given [AutofreeScope].
  */
+@ExperimentalForeignApi
 public fun Array<String>.toCStringArray(autofreeScope: AutofreeScope): CPointer<CPointerVar<ByteVar>> =
         autofreeScope.allocArrayOf(this.map { it.cstr.getPointer(autofreeScope) })
 
 
+@ExperimentalForeignApi
 private class U16CString(val chars: CharArray): CValues<UShortVar>() {
     override val size get() = 2 * (chars.size + 1)
 
@@ -456,16 +508,19 @@ private class U16CString(val chars: CharArray): CValues<UShortVar>() {
 /**
  * @return the value of zero-terminated UTF-16-encoded C string constructed from given [kotlin.String].
  */
+@ExperimentalForeignApi
 public val String.wcstr: CValues<UShortVar>
     get() = U16CString(this.toCharArray())
 
 /**
  * @return the value of zero-terminated UTF-16-encoded C string constructed from given [kotlin.String].
  */
+@ExperimentalForeignApi
 public val String.utf16: CValues<UShortVar>
     get() = U16CString(this.toCharArray())
 
-private class U32CString(val chars: CharArray): CValues<IntVar>() {
+@ExperimentalForeignApi
+private class U32CString(val chars: CharArray) : CValues<IntVar>() {
     override val size get() = 4 * (chars.size + 1)
 
     override val align get() = 4
@@ -499,6 +554,7 @@ private class U32CString(val chars: CharArray): CValues<IntVar>() {
 /**
  * @return the value of zero-terminated UTF-32-encoded C string constructed from given [kotlin.String].
  */
+@ExperimentalForeignApi
 public val String.utf32: CValues<IntVar>
     get() = U32CString(this.toCharArray())
 
@@ -507,16 +563,19 @@ public val String.utf32: CValues<IntVar>
 /**
  * @return the [kotlin.String] decoded from given zero-terminated UTF-8-encoded C string.
  */
+@ExperimentalForeignApi
 public fun CPointer<ByteVar>.toKStringFromUtf8(): String = this.toKStringFromUtf8Impl()
 
 /**
  * @return the [kotlin.String] decoded from given zero-terminated UTF-8-encoded C string.
  */
+@ExperimentalForeignApi
 public fun CPointer<ByteVar>.toKString(): String = this.toKStringFromUtf8()
 
 /**
  * @return the [kotlin.String] decoded from given zero-terminated UTF-16-encoded C string.
  */
+@ExperimentalForeignApi
 public fun CPointer<ShortVar>.toKStringFromUtf16(): String {
     val nativeBytes = this
 
@@ -536,6 +595,7 @@ public fun CPointer<ShortVar>.toKStringFromUtf16(): String {
 /**
  * @return the [kotlin.String] decoded from given zero-terminated UTF-32-encoded C string.
  */
+@ExperimentalForeignApi
 public fun CPointer<IntVar>.toKStringFromUtf32(): String {
     val nativeBytes = this
 
@@ -565,6 +625,7 @@ public fun CPointer<IntVar>.toKStringFromUtf32(): String {
     return chars.concatToString()
 }
 
+
 /**
  * Decodes a string from the bytes in UTF-8 encoding in this array.
  * Bytes following the first occurrence of `0` byte, if it occurs, are not decoded.
@@ -572,6 +633,7 @@ public fun CPointer<IntVar>.toKStringFromUtf32(): String {
  * Malformed byte sequences are replaced by the replacement char `\uFFFD`.
  */
 @SinceKotlin("1.3")
+@ExperimentalForeignApi
 public fun ByteArray.toKString() : String {
     val realEndIndex = realEndIndex(this, 0, this.size)
     return decodeToString(0, realEndIndex)
@@ -590,6 +652,7 @@ public fun ByteArray.toKString() : String {
  * @throws CharacterCodingException if the byte array contains malformed UTF-8 byte sequence and [throwOnInvalidSequence] is true.
  */
 @SinceKotlin("1.3")
+@ExperimentalForeignApi
 public fun ByteArray.toKString(
         startIndex: Int = 0,
         endIndex: Int = this.size,
@@ -617,6 +680,7 @@ private fun checkBoundsIndexes(startIndex: Int, endIndex: Int, size: Int) {
     }
 }
 
+@ExperimentalForeignApi
 public class MemScope : ArenaBase() {
 
     val memScope: MemScope
@@ -632,6 +696,7 @@ public class MemScope : ArenaBase() {
  * Runs given [block] providing allocation of memory
  * which will be automatically disposed at the end of this scope.
  */
+@ExperimentalForeignApi
 public inline fun <R> memScoped(block: MemScope.()->R): R {
     val memScope = MemScope()
     try {
@@ -641,6 +706,7 @@ public inline fun <R> memScoped(block: MemScope.()->R): R {
     }
 }
 
+@ExperimentalForeignApi
 public fun COpaquePointer.readBytes(count: Int): ByteArray {
     val result = ByteArray(count)
     nativeMemUtils.getByteArray(this.reinterpret<ByteVar>().pointed, result, count)
diff --git a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/_UtilsGenerated.kt b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/_UtilsGenerated.kt
index 555c294abd3..9f6c2da4b51 100644
--- a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/_UtilsGenerated.kt
+++ b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/_UtilsGenerated.kt
@@ -12,6 +12,7 @@ package kotlinx.cinterop
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : Boolean> NativePlacement.alloc(value: T): BooleanVarOf<T> =
         alloc<BooleanVarOf<T>> { this.value = value }
 
@@ -19,6 +20,7 @@ public fun <T : Boolean> NativePlacement.alloc(value: T): BooleanVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : Byte> NativePlacement.alloc(value: T): ByteVarOf<T> =
         alloc<ByteVarOf<T>> { this.value = value }
 
@@ -26,6 +28,7 @@ public fun <T : Byte> NativePlacement.alloc(value: T): ByteVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : Short> NativePlacement.alloc(value: T): ShortVarOf<T> =
         alloc<ShortVarOf<T>> { this.value = value }
 
@@ -33,6 +36,7 @@ public fun <T : Short> NativePlacement.alloc(value: T): ShortVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : Int> NativePlacement.alloc(value: T): IntVarOf<T> =
         alloc<IntVarOf<T>> { this.value = value }
 
@@ -40,6 +44,7 @@ public fun <T : Int> NativePlacement.alloc(value: T): IntVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : Long> NativePlacement.alloc(value: T): LongVarOf<T> =
         alloc<LongVarOf<T>> { this.value = value }
 
@@ -47,6 +52,7 @@ public fun <T : Long> NativePlacement.alloc(value: T): LongVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : UByte> NativePlacement.alloc(value: T): UByteVarOf<T> =
         alloc<UByteVarOf<T>> { this.value = value }
 
@@ -54,6 +60,7 @@ public fun <T : UByte> NativePlacement.alloc(value: T): UByteVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : UShort> NativePlacement.alloc(value: T): UShortVarOf<T> =
         alloc<UShortVarOf<T>> { this.value = value }
 
@@ -61,6 +68,7 @@ public fun <T : UShort> NativePlacement.alloc(value: T): UShortVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : UInt> NativePlacement.alloc(value: T): UIntVarOf<T> =
         alloc<UIntVarOf<T>> { this.value = value }
 
@@ -68,6 +76,7 @@ public fun <T : UInt> NativePlacement.alloc(value: T): UIntVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : ULong> NativePlacement.alloc(value: T): ULongVarOf<T> =
         alloc<ULongVarOf<T>> { this.value = value }
 
@@ -75,6 +84,7 @@ public fun <T : ULong> NativePlacement.alloc(value: T): ULongVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : Float> NativePlacement.alloc(value: T): FloatVarOf<T> =
         alloc<FloatVarOf<T>> { this.value = value }
 
@@ -82,6 +92,7 @@ public fun <T : Float> NativePlacement.alloc(value: T): FloatVarOf<T> =
  * Allocates variable with given value type and initializes it with given value.
  */
 @Suppress("FINAL_UPPER_BOUND")
+@ExperimentalForeignApi
 public fun <T : Double> NativePlacement.alloc(value: T): DoubleVarOf<T> =
         alloc<DoubleVarOf<T>> { this.value = value }
 
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ForeignException.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ForeignException.kt
index db94c707f08..160f3abb419 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ForeignException.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ForeignException.kt
@@ -1,13 +1,15 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+
 package kotlinx.cinterop
 
 import kotlin.native.internal.ExportForCppRuntime
 import kotlin.native.internal.GCUnsafeCall
 
-public class ForeignException internal constructor(val nativeException: Any?): Exception() {
+@BetaInteropApi
+public class ForeignException internal constructor(val nativeException: Any?) : Exception() {
     override val message: String = nativeException?.let {
         kotlin_ObjCExport_ExceptionDetails(nativeException)
     }?: ""
@@ -18,5 +20,7 @@ public class ForeignException internal constructor(val nativeException: Any?): E
 }
 
 @ExportForCppRuntime
+@BetaInteropApi
+@ExperimentalForeignApi
 internal fun CreateForeignException(payload: NativePtr): Throwable
         = ForeignException(interpretObjCPointerOrNull<Any?>(payload))
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/FunctionPointers.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/FunctionPointers.kt
index b59df85afcc..31465b7d49c 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/FunctionPointers.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/FunctionPointers.kt
@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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 kotlinx.cinterop
@@ -20,48 +9,71 @@ import kotlin.native.internal.TypedIntrinsic
 import kotlin.native.internal.IntrinsicType
 import kotlin.native.internal.ExportForCompiler
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <R> CPointer<CFunction<() -> R>>.invoke(): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, R> CPointer<CFunction<(P1) -> R>>.invoke(p1: P1): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, R> CPointer<CFunction<(P1, P2) -> R>>.invoke(p1: P1, p2: P2): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, R> CPointer<CFunction<(P1, P2, P3) -> R>>.invoke(p1: P1, p2: P2, p3: P3): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, R> CPointer<CFunction<(P1, P2, P3, P4) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, R> CPointer<CFunction<(P1, P2, P3, P4, P5) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15, p16: P16): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15, p16: P16, p17: P17): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15, p16: P16, p17: P17, p18: P18): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15, p16: P16, p17: P17, p18: P18, p19: P19): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15, p16: P16, p17: P17, p18: P18, p19: P19, p20: P20): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15, p16: P16, p17: P17, p18: P18, p19: P19, p20: P20, p21: P21): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_FUNPTR_INVOKE) external operator fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, P22, R> CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, P22) -> R>>.invoke(p1: P1, p2: P2, p3: P3, p4: P4, p5: P5, p6: P6, p7: P7, p8: P8, p9: P9, p10: P10, p11: P11, p12: P12, p13: P13, p14: P14, p15: P15, p16: P16, p17: P17, p18: P18, p19: P19, p20: P20, p21: P21, p22: P22): R
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ManagedType.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ManagedType.kt
index 1d9630d0d2a..a6119e7063a 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ManagedType.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ManagedType.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 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.
  */
 
@@ -7,9 +7,14 @@ package kotlinx.cinterop
 
 import kotlinx.cinterop.CStructVar
 
+@ExperimentalForeignApi
 interface SkiaRefCnt
+
+@ExperimentalForeignApi
 interface CPlusPlusClass
 
+@ExperimentalForeignApi
 abstract class ManagedType<T : CStructVar>(val cpp: T)
 
+@ExperimentalForeignApi
 val <T : CStructVar> ManagedType<T>.ptr: CPointer<T> get() = this.cpp.ptr
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeMem.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeMem.kt
index 6697a37844c..3a00eed1663 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeMem.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeMem.kt
@@ -1,19 +1,8 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlinx.cinterop
 
 import kotlin.native.*
@@ -139,6 +128,7 @@ internal object nativeMemUtils {
     }
 }
 
+@ExperimentalForeignApi
 public fun CPointer<UShortVar>.toKStringFromUtf16(): String {
     val nativeBytes = this
 
@@ -155,8 +145,10 @@ public fun CPointer<UShortVar>.toKStringFromUtf16(): String {
     return chars.concatToString()
 }
 
+@ExperimentalForeignApi
 public fun CPointer<ShortVar>.toKString(): String = this.toKStringFromUtf16()
 
+@ExperimentalForeignApi
 public fun CPointer<UShortVar>.toKString(): String = this.toKStringFromUtf16()
 
 @GCUnsafeCall("Kotlin_interop_malloc")
@@ -165,7 +157,10 @@ private external fun malloc(size: Long, align: Int): NativePtr
 @GCUnsafeCall("Kotlin_interop_free")
 private external fun cfree(ptr: NativePtr)
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_READ_BITS)
 external fun readBits(ptr: NativePtr, offset: Long, size: Int, signed: Boolean): Long
+
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_WRITE_BITS)
 external fun writeBits(ptr: NativePtr, offset: Long, size: Int, value: Long)
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeStableRef.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeStableRef.kt
index eded7d5a25c..9652444137d 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeStableRef.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeStableRef.kt
@@ -1,20 +1,10 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlinx.cinterop
+
 import kotlin.native.*
 import kotlin.native.internal.GCUnsafeCall
 
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt
index 8a99919937f..f4431b9d34c 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt
@@ -1,19 +1,7 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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 kotlinx.cinterop
 
 import kotlin.native.internal.reinterpret
@@ -22,17 +10,21 @@ import kotlin.native.internal.VolatileLambda
 import kotlin.native.internal.TypedIntrinsic
 import kotlin.native.internal.IntrinsicType
 
+@ExperimentalForeignApi
 typealias NativePtr = kotlin.native.internal.NativePtr
 internal typealias NonNullNativePtr = kotlin.native.internal.NonNullNativePtr
 
 @Suppress("NOTHING_TO_INLINE")
+@ExperimentalForeignApi
 internal inline fun NativePtr.toNonNull() = this.reinterpret<NativePtr, NonNullNativePtr>()
 
+@ExperimentalForeignApi
 inline val nativeNullPtr: NativePtr
     get() = NativePtr.NULL
 
 @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
 @Suppress("DEPRECATION")
+@ExperimentalForeignApi
 fun <T : CVariable> typeOf(): CVariable.Type = throw Error("typeOf() is called with erased argument")
 
 /**
@@ -40,23 +32,29 @@ fun <T : CVariable> typeOf(): CVariable.Type = throw Error("typeOf() is called w
  *
  * @param T must not be abstract
  */
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.IDENTITY)
 external fun <T : NativePointed> interpretNullablePointed(ptr: NativePtr): T?
 
 /**
  *  Performs type cast of the [CPointer] from the given raw pointer.
  */
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.IDENTITY)
 external fun <T : CPointed> interpretCPointer(rawValue: NativePtr): CPointer<T>?
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.IDENTITY)
 external fun NativePointed.getRawPointer(): NativePtr
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.IDENTITY)
 external fun CPointer<*>.getRawValue(): NativePtr
 
+@ExperimentalForeignApi
 internal fun CPointer<*>.cPointerToString() = "CPointer(raw=$rawValue)"
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND")
 public class Vector128VarOf<T : Vector128>(rawPtr: NativePtr) : CVariable(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
@@ -64,8 +62,10 @@ public class Vector128VarOf<T : Vector128>(rawPtr: NativePtr) : CVariable(rawPtr
     companion object : Type(size = 16, align = 16)
 }
 
+@ExperimentalForeignApi
 public typealias Vector128Var = Vector128VarOf<Vector128>
 
+@ExperimentalForeignApi
 @Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Vector128> Vector128VarOf<T>.value: T
     get() = nativeMemUtils.getVector(this) as T
@@ -77,48 +77,71 @@ public var <T : Vector128> Vector128VarOf<T>.value: T
  * @param function must be *static*, i.e. an (unbound) reference to a Kotlin function or
  * a closure which doesn't capture any variable
  */
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <R> staticCFunction(@VolatileLambda function: () -> R): CPointer<CFunction<() -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, R> staticCFunction(@VolatileLambda function: (P1) -> R): CPointer<CFunction<(P1) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, R> staticCFunction(@VolatileLambda function: (P1, P2) -> R): CPointer<CFunction<(P1, P2) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, R> staticCFunction(@VolatileLambda function: (P1, P2, P3) -> R): CPointer<CFunction<(P1, P2, P3) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4) -> R): CPointer<CFunction<(P1, P2, P3, P4) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21) -> R>>
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_STATIC_C_FUNCTION) external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, P22, R> staticCFunction(@VolatileLambda function: (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, P22) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, P22) -> R>>
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeUtils.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeUtils.kt
index 0eebf60f2ad..f5f5bd9d4d0 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeUtils.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeUtils.kt
@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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 kotlinx.cinterop
@@ -24,48 +13,67 @@ import kotlin.native.internal.IntrinsicType
 internal fun encodeToUtf8(str: String): ByteArray = str.encodeToByteArray()
 
 @GCUnsafeCall("Kotlin_CString_toKStringFromUtf8Impl")
+@ExperimentalForeignApi
 internal external fun CPointer<ByteVar>.toKStringFromUtf8Impl(): String
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_BITS_TO_FLOAT)
 external fun bitsToFloat(bits: Int): Float
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_BITS_TO_DOUBLE)
 external fun bitsToDouble(bits: Long): Double
 
-// TODO: deprecate.
+@Deprecated("Deprecated without replacement as part of the obsolete interop API", level = DeprecationLevel.WARNING)
 @TypedIntrinsic(IntrinsicType.INTEROP_SIGN_EXTEND)
 external inline fun <reified R : Number> Number.signExtend(): R
 
-// TODO: deprecate.
+@Deprecated("Deprecated without replacement as part of the obsolete interop API", level = DeprecationLevel.WARNING)
 @TypedIntrinsic(IntrinsicType.INTEROP_NARROW)
 external inline fun <reified R : Number> Number.narrow(): R
 
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> Byte.convert(): R
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> Short.convert(): R
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> Int.convert(): R
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> Long.convert(): R
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> UByte.convert(): R
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> UShort.convert(): R
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> UInt.convert(): R
+@ExperimentalForeignApi
 @TypedIntrinsic(IntrinsicType.INTEROP_CONVERT) external inline fun <reified R : Any> ULong.convert(): R
 
 @Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER, AnnotationTarget.FILE)
 @Retention(AnnotationRetention.SOURCE)
 internal annotation class JvmName(val name: String)
 
+@ExperimentalForeignApi
 fun cValuesOf(vararg elements: UByte): CValues<UByteVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 fun cValuesOf(vararg elements: UShort): CValues<UShortVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 fun cValuesOf(vararg elements: UInt): CValues<UIntVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 fun cValuesOf(vararg elements: ULong): CValues<ULongVar> =
         createValues(elements.size) { index -> this.value = elements[index] }
 
+@ExperimentalForeignApi
 fun UByteArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 fun UShortArray.toCValues() = cValuesOf(*this)
+@ExperimentalForeignApi
 fun UIntArray.toCValues() = cValuesOf(*this)
-fun ULongArray.toCValues() = cValuesOf(*this)
\ No newline at end of file
+@ExperimentalForeignApi
+fun ULongArray.toCValues() = cValuesOf(*this)
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCImpl.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCImpl.kt
index f32cf4bf175..fee555316ed 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCImpl.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCImpl.kt
@@ -1,30 +1,27 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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.
  */
 
 @file:Suppress("NOTHING_TO_INLINE")
+@file:OptIn(ExperimentalForeignApi::class, BetaInteropApi::class)
 
 package kotlinx.cinterop
+
 import kotlin.native.*
 import kotlin.native.internal.*
+import kotlin.native.internal.InternalForKotlinNative
 
+@BetaInteropApi
 interface ObjCObject
+@BetaInteropApi
 interface ObjCClass : ObjCObject
+@BetaInteropApi
 interface ObjCClassOf<T : ObjCObject> : ObjCClass // TODO: T should be added to ObjCClass and all meta-classes instead.
+@BetaInteropApi
 typealias ObjCObjectMeta = ObjCClass
 
+@BetaInteropApi
 interface ObjCProtocol : ObjCObject
 
 @ExportTypeInfo("theForeignObjCObjectTypeInfo")
@@ -32,13 +29,17 @@ interface ObjCProtocol : ObjCObject
 @kotlin.native.internal.Frozen
 internal open class ForeignObjCObject : kotlin.native.internal.ObjCObjectWrapper
 
+@BetaInteropApi
 abstract class ObjCObjectBase protected constructor() : ObjCObject {
     @Target(AnnotationTarget.CONSTRUCTOR)
     @Retention(AnnotationRetention.SOURCE)
     annotation class OverrideInit
 }
+
+@BetaInteropApi
 abstract class ObjCObjectBaseMeta protected constructor() : ObjCObjectBase(), ObjCObjectMeta {}
 
+@BetaInteropApi
 fun optional(): Nothing = throw RuntimeException("Do not call me!!!")
 
 @Deprecated(
@@ -48,6 +49,7 @@ fun optional(): Nothing = throw RuntimeException("Do not call me!!!")
 @TypedIntrinsic(IntrinsicType.OBJC_INIT_BY)
 external fun <T : ObjCObjectBase> T.initBy(constructorCall: T): T
 
+@BetaInteropApi
 @kotlin.native.internal.ExportForCompiler
 private fun ObjCObjectBase.superInitCheck(superInitCallResult: ObjCObject?) {
     if (superInitCallResult == null)
@@ -60,20 +62,25 @@ private fun ObjCObjectBase.superInitCheck(superInitCallResult: ObjCObject?) {
 internal fun <T : Any?> Any?.uncheckedCast(): T = @Suppress("UNCHECKED_CAST") (this as T)
 
 // Note: if this is called for non-frozen object on a wrong worker, the program will terminate.
+@ExperimentalForeignApi
 @GCUnsafeCall("Kotlin_Interop_refFromObjC")
 external fun <T> interpretObjCPointerOrNull(objcPtr: NativePtr): T?
 
 @ExportForCppRuntime
+@ExperimentalForeignApi
 inline fun <T : Any> interpretObjCPointer(objcPtr: NativePtr): T = interpretObjCPointerOrNull<T>(objcPtr)!!
 
 @GCUnsafeCall("Kotlin_Interop_refToObjC")
-external fun Any?.objcPtr(): NativePtr
+@ExperimentalForeignApi
+public external fun Any?.objcPtr(): NativePtr
 
 @GCUnsafeCall("Kotlin_Interop_createKotlinObjectHolder")
-external fun createKotlinObjectHolder(any: Any?): NativePtr
+@ExperimentalForeignApi
+public external fun createKotlinObjectHolder(any: Any?): NativePtr
 
 // Note: if this is called for non-frozen underlying ref on a wrong worker, the program will terminate.
-inline fun <reified T : Any> unwrapKotlinObjectHolder(holder: Any?): T {
+@BetaInteropApi
+public inline fun <reified T : Any> unwrapKotlinObjectHolder(holder: Any?): T {
     return unwrapKotlinObjectHolderImpl(holder!!.objcPtr()) as T
 }
 
@@ -81,23 +88,28 @@ inline fun <reified T : Any> unwrapKotlinObjectHolder(holder: Any?): T {
 @GCUnsafeCall("Kotlin_Interop_unwrapKotlinObjectHolder")
 external internal fun unwrapKotlinObjectHolderImpl(ptr: NativePtr): Any
 
+@ExperimentalForeignApi
 class ObjCObjectVar<T>(rawPtr: NativePtr) : CVariable(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
     @Suppress("DEPRECATION")
     companion object : CVariable.Type(pointerSize.toLong(), pointerSize)
 }
 
+@ExperimentalForeignApi
 class ObjCNotImplementedVar<T : Any?>(rawPtr: NativePtr) : CVariable(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
     @Suppress("DEPRECATION")
     companion object : CVariable.Type(pointerSize.toLong(), pointerSize)
 }
 
+@ExperimentalForeignApi
 var <T : Any?> ObjCNotImplementedVar<T>.value: T
     get() = TODO()
     set(_) = TODO()
 
+@ExperimentalForeignApi
 typealias ObjCStringVarOf<T> = ObjCNotImplementedVar<T>
+@ExperimentalForeignApi
 typealias ObjCBlockVar<T> = ObjCNotImplementedVar<T>
 
 @TypedIntrinsic(IntrinsicType.OBJC_CREATE_SUPER_STRUCT)
@@ -106,27 +118,33 @@ internal external fun createObjCSuperStruct(receiver: NativePtr, superClass: Nat
 
 @Target(AnnotationTarget.CLASS)
 @Retention(AnnotationRetention.BINARY)
-annotation class ExternalObjCClass(val protocolGetter: String = "", val binaryName: String = "")
+@InternalForKotlinNative
+public annotation class ExternalObjCClass(val protocolGetter: String = "", val binaryName: String = "")
 
 @Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
 @Retention(AnnotationRetention.BINARY)
-annotation class ObjCMethod(val selector: String, val encoding: String, val isStret: Boolean = false)
+@InternalForKotlinNative
+public annotation class ObjCMethod(val selector: String, val encoding: String, val isStret: Boolean = false)
 
 @Target(AnnotationTarget.FUNCTION)
 @Retention(AnnotationRetention.BINARY)
-annotation class ObjCDirect(val symbol: String)
+@InternalForKotlinNative
+public annotation class ObjCDirect(val symbol: String)
 
 @Target(AnnotationTarget.CONSTRUCTOR)
 @Retention(AnnotationRetention.BINARY)
-annotation class ObjCConstructor(val initSelector: String, val designated: Boolean)
+@InternalForKotlinNative
+public annotation class ObjCConstructor(val initSelector: String, val designated: Boolean)
 
 @Target(AnnotationTarget.FUNCTION)
 @Retention(AnnotationRetention.BINARY)
-annotation class ObjCFactory(val selector: String, val encoding: String, val isStret: Boolean = false)
+@InternalForKotlinNative
+public annotation class ObjCFactory(val selector: String, val encoding: String, val isStret: Boolean = false)
 
 @Target(AnnotationTarget.FILE)
 @Retention(AnnotationRetention.BINARY)
-annotation class InteropStubs()
+@InternalForKotlinNative
+public annotation class InteropStubs()
 
 @PublishedApi
 @Target(AnnotationTarget.FUNCTION)
@@ -193,20 +211,25 @@ internal external fun createObjCObjectHolder(ptr: NativePtr): Any?
 // Objective-C runtime:
 
 @GCUnsafeCall("objc_retainAutoreleaseReturnValue")
-external fun objc_retainAutoreleaseReturnValue(ptr: NativePtr): NativePtr
+@ExperimentalForeignApi
+public external fun objc_retainAutoreleaseReturnValue(ptr: NativePtr): NativePtr
 
 @GCUnsafeCall("Kotlin_objc_autoreleasePoolPush")
-external fun objc_autoreleasePoolPush(): NativePtr
+@ExperimentalForeignApi
+public external fun objc_autoreleasePoolPush(): NativePtr
 
 @GCUnsafeCall("Kotlin_objc_autoreleasePoolPop")
-external fun objc_autoreleasePoolPop(ptr: NativePtr)
+@ExperimentalForeignApi
+public external fun objc_autoreleasePoolPop(ptr: NativePtr)
 
 @GCUnsafeCall("Kotlin_objc_allocWithZone")
 @FilterExceptions
 private external fun objc_allocWithZone(clazz: NativePtr): NativePtr
 
 @GCUnsafeCall("Kotlin_objc_retain")
-external fun objc_retain(ptr: NativePtr): NativePtr
+@ExperimentalForeignApi
+public external fun objc_retain(ptr: NativePtr): NativePtr
 
 @GCUnsafeCall("Kotlin_objc_release")
-external fun objc_release(ptr: NativePtr)
+@ExperimentalForeignApi
+public external fun objc_release(ptr: NativePtr)
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCKClassSupport.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCKClassSupport.kt
index 880f357680d..8e4eb1e2379 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCKClassSupport.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCKClassSupport.kt
@@ -1,8 +1,8 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the LICENSE file.
+ * Copyright 2010-2023 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.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlinx.cinterop
 
 import kotlin.native.internal.KClassImpl
@@ -15,7 +15,8 @@ import kotlin.reflect.KClass
  *
  * Otherwise returns `null`.
  */
-fun getOriginalKotlinClass(objCClass: ObjCClass): KClass<*>? {
+@BetaInteropApi
+public fun getOriginalKotlinClass(objCClass: ObjCClass): KClass<*>? {
     val typeInfo = getTypeInfoForClass(objCClass.objcPtr())
     if (typeInfo.isNull()) return null
 
@@ -28,7 +29,8 @@ fun getOriginalKotlinClass(objCClass: ObjCClass): KClass<*>? {
  *
  * Otherwise returns `null`.
  */
-fun getOriginalKotlinClass(objCProtocol: ObjCProtocol): KClass<*>? {
+@BetaInteropApi
+public fun getOriginalKotlinClass(objCProtocol: ObjCProtocol): KClass<*>? {
     val typeInfo = getTypeInfoForProtocol(objCProtocol.objcPtr())
     if (typeInfo.isNull()) return null
 
@@ -39,4 +41,5 @@ fun getOriginalKotlinClass(objCProtocol: ObjCProtocol): KClass<*>? {
 private external fun getTypeInfoForClass(ptr: NativePtr): NativePtr
 
 @GCUnsafeCall("Kotlin_ObjCInterop_getTypeInfoForProtocol")
-private external fun getTypeInfoForProtocol(ptr: NativePtr): NativePtr
\ No newline at end of file
+private external fun getTypeInfoForProtocol(ptr: NativePtr): NativePtr
+
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCUtils.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCUtils.kt
index b3b76ea1672..0e39256f50b 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCUtils.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/ObjectiveCUtils.kt
@@ -1,22 +1,13 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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 kotlinx.cinterop
 
-inline fun <R> autoreleasepool(block: () -> R): R {
+@BetaInteropApi
+@OptIn(ExperimentalForeignApi::class)
+public inline fun <R> autoreleasepool(block: () -> R): R {
     val pool = objc_autoreleasePoolPush()
     return try {
         block()
@@ -25,11 +16,10 @@ inline fun <R> autoreleasepool(block: () -> R): R {
     }
 }
 
-@Deprecated("Use plain Kotlin cast", ReplaceWith("this as T"), DeprecationLevel.ERROR)
-fun <T : ObjCObject> ObjCObject.reinterpret() = @Suppress("DEPRECATION") this.uncheckedCast<T>()
-
 // TODO: null checks
-var <T> ObjCObjectVar<T>.value: T
+@BetaInteropApi
+@ExperimentalForeignApi
+public var <T> ObjCObjectVar<T>.value: T
     @Suppress("DEPRECATION") get() =
         interpretObjCPointerOrNull<T>(nativeMemUtils.getNativePtr(this)).uncheckedCast<T>()
 
@@ -41,7 +31,8 @@ var <T> ObjCObjectVar<T>.value: T
  */
 @Target(AnnotationTarget.FUNCTION)
 @Retention(AnnotationRetention.SOURCE)
-annotation class ObjCAction
+@BetaInteropApi
+public annotation class ObjCAction
 
 /**
  * Makes Kotlin property in Objective-C class settable through Objective-C dispatch
@@ -49,7 +40,8 @@ annotation class ObjCAction
  */
 @Target(AnnotationTarget.PROPERTY)
 @Retention(AnnotationRetention.SOURCE)
-annotation class ObjCOutlet
+@BetaInteropApi
+public annotation class ObjCOutlet
 
 /**
  * Makes Kotlin subclass of Objective-C class visible for runtime lookup
@@ -60,4 +52,5 @@ annotation class ObjCOutlet
  */
 @Target(AnnotationTarget.CLASS)
 @Retention(AnnotationRetention.SOURCE)
-annotation class ExportObjCClass(val name: String = "")
+@BetaInteropApi
+public annotation class ExportObjCClass(val name: String = "")
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/Pinning.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/Pinning.kt
index d8ce8a1ad8e..e1ed911eba3 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/Pinning.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/Pinning.kt
@@ -1,23 +1,14 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 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.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlinx.cinterop
+
 import kotlin.native.*
 import kotlin.native.internal.GCUnsafeCall
 
+@ExperimentalForeignApi
 data class Pinned<out T : Any> internal constructor(private val stablePtr: COpaquePointer) {
 
     /**
@@ -34,8 +25,10 @@ data class Pinned<out T : Any> internal constructor(private val stablePtr: COpaq
 
 }
 
+@ExperimentalForeignApi
 fun <T : Any> T.pin() = Pinned<T>(createStablePointer(this))
 
+@ExperimentalForeignApi
 inline fun <T : Any, R> T.usePinned(block: (Pinned<T>) -> R): R {
     val pinned = this.pin()
     return try {
@@ -45,43 +38,68 @@ inline fun <T : Any, R> T.usePinned(block: (Pinned<T>) -> R): R {
     }
 }
 
+@ExperimentalForeignApi
 fun Pinned<ByteArray>.addressOf(index: Int): CPointer<ByteVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun ByteArray.refTo(index: Int): CValuesRef<ByteVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<String>.addressOf(index: Int): CPointer<COpaque> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun String.refTo(index: Int): CValuesRef<COpaque> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<CharArray>.addressOf(index: Int): CPointer<COpaque> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun CharArray.refTo(index: Int): CValuesRef<COpaque> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<ShortArray>.addressOf(index: Int): CPointer<ShortVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun ShortArray.refTo(index: Int): CValuesRef<ShortVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<IntArray>.addressOf(index: Int): CPointer<IntVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun IntArray.refTo(index: Int): CValuesRef<IntVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<LongArray>.addressOf(index: Int): CPointer<LongVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun LongArray.refTo(index: Int): CValuesRef<LongVar> = this.usingPinned { addressOf(index) }
 
 // TODO: pinning of unsigned arrays involves boxing as they are inline classes wrapping signed arrays.
+@ExperimentalForeignApi
 fun Pinned<UByteArray>.addressOf(index: Int): CPointer<UByteVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun UByteArray.refTo(index: Int): CValuesRef<UByteVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<UShortArray>.addressOf(index: Int): CPointer<UShortVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun UShortArray.refTo(index: Int): CValuesRef<UShortVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<UIntArray>.addressOf(index: Int): CPointer<UIntVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun UIntArray.refTo(index: Int): CValuesRef<UIntVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<ULongArray>.addressOf(index: Int): CPointer<ULongVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun ULongArray.refTo(index: Int): CValuesRef<ULongVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<FloatArray>.addressOf(index: Int): CPointer<FloatVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun FloatArray.refTo(index: Int): CValuesRef<FloatVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 fun Pinned<DoubleArray>.addressOf(index: Int): CPointer<DoubleVar> = this.get().addressOfElement(index)
+@ExperimentalForeignApi
 fun DoubleArray.refTo(index: Int): CValuesRef<DoubleVar> = this.usingPinned { addressOf(index) }
 
+@ExperimentalForeignApi
 private inline fun <T : Any, P : CPointed> T.usingPinned(
         crossinline block: Pinned<T>.() -> CPointer<P>
 ) = object : CValuesRef<P>() {
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/internal/Annotations.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/internal/Annotations.kt
index b81351e2099..840cb4c704b 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/internal/Annotations.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/internal/Annotations.kt
@@ -1,5 +1,9 @@
+
 package kotlinx.cinterop.internal
 
+import kotlin.native.internal.InternalForKotlinNative
+
+@InternalForKotlinNative
 @Target(AnnotationTarget.CLASS)
 @Retention(AnnotationRetention.BINARY)
 annotation class CStruct(val spelling: String) {
@@ -38,6 +42,7 @@ annotation class CStruct(val spelling: String) {
         AnnotationTarget.PROPERTY_GETTER,
         AnnotationTarget.PROPERTY_SETTER
 )
+@InternalForKotlinNative
 @Retention(AnnotationRetention.BINARY)
 public annotation class CCall(val id: String) {
     @Target(AnnotationTarget.VALUE_PARAMETER)
@@ -77,6 +82,7 @@ public annotation class CCall(val id: String) {
  * Collection of annotations that allow to store
  * constant values.
  */
+@InternalForKotlinNative
 public object ConstantValue {
     @Retention(AnnotationRetention.BINARY)
     annotation class Byte(val value: kotlin.Byte)
@@ -106,6 +112,7 @@ public object ConstantValue {
  * Denotes property that is an alias to some enum entry.
  */
 @Target(AnnotationTarget.CLASS)
+@InternalForKotlinNative
 @Retention(AnnotationRetention.BINARY)
 public annotation class CEnumEntryAlias(val entryName: String)
 
@@ -113,5 +120,6 @@ public annotation class CEnumEntryAlias(val entryName: String)
  * Stores instance size of the type T: CEnumVar.
  */
 @Target(AnnotationTarget.CLASS)
+@InternalForKotlinNative
 @Retention(AnnotationRetention.BINARY)
 public annotation class CEnumVarTypeSize(val size: Int)
diff --git a/kotlin-native/Interop/Skia/build.gradle b/kotlin-native/Interop/Skia/build.gradle
index b1d2b5f30b7..8509adafbeb 100644
--- a/kotlin-native/Interop/Skia/build.gradle
+++ b/kotlin-native/Interop/Skia/build.gradle
@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
  */
 
 buildscript {
@@ -24,3 +13,10 @@ dependencies {
     implementation project(":kotlin-native:Interop:Indexer")
     implementation project(":kotlin-native:Interop:StubGenerator")
 }
+
+compileKotlin {
+    kotlinOptions.freeCompilerArgs = [
+            "-opt-in=kotlinx.cinterop.BetaInteropApi",
+            "-opt-in=kotlinx.cinterop.ExperimentalForeignApi",
+    ]
+}
diff --git a/kotlin-native/Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrTextEmitter.kt b/kotlin-native/Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrTextEmitter.kt
index 1871ea0887e..bcb79e733b0 100644
--- a/kotlin-native/Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrTextEmitter.kt
+++ b/kotlin-native/Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrTextEmitter.kt
@@ -4,6 +4,7 @@
  */
 package org.jetbrains.kotlin.native.interop.gen
 
+import kotlinx.cinterop.ExperimentalForeignApi
 import org.jetbrains.kotlin.native.interop.gen.jvm.KotlinPlatform
 import org.jetbrains.kotlin.native.interop.indexer.*
 import org.jetbrains.kotlin.utils.addIfNotNull
@@ -114,6 +115,7 @@ class StubIrTextEmitter(
         }
 
         out("@file:Suppress(${suppress.joinToString { it.quoteAsKotlinLiteral() }})")
+        out("@file:OptIn(ExperimentalForeignApi::class)")
         if (pkgName != "") {
             out("package ${context.validPackageName}")
             out("")
diff --git a/kotlin-native/backend.native/build.gradle b/kotlin-native/backend.native/build.gradle
index c99b0eecbe5..d8c1a94d528 100644
--- a/kotlin-native/backend.native/build.gradle
+++ b/kotlin-native/backend.native/build.gradle
@@ -1,11 +1,14 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
 import org.jetbrains.kotlin.cpp.CppConsumerPlugin
 import org.jetbrains.kotlin.cpp.CppUsage
 import org.jetbrains.kotlin.cpp.DependencyHandlerExKt
 import org.jetbrains.kotlin.tools.NativePluginKt
-/*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the LICENSE file.
- */
+
+
 buildscript {
     apply from: "../../kotlin-native/gradle/kotlinGradlePlugin.gradle"
     apply plugin: 'project-report'
@@ -31,7 +34,12 @@ sourceSets {
 
 compileCompilerKotlin {
     kotlinOptions.jvmTarget = "1.8"
-    kotlinOptions.freeCompilerArgs += ['-opt-in=kotlin.RequiresOptIn', '-opt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI', '-Xskip-prerelease-check']
+    kotlinOptions.freeCompilerArgs += [
+            '-opt-in=kotlin.RequiresOptIn',
+            '-opt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI',
+            "-opt-in=kotlinx.cinterop.BetaInteropApi",
+            "-opt-in=kotlinx.cinterop.ExperimentalForeignApi",
+            '-Xskip-prerelease-check']
 }
 
 compileCli_bcKotlin {
diff --git a/kotlin-native/backend.native/tests/build.gradle b/kotlin-native/backend.native/tests/build.gradle
index 2487b6b9511..7d7f506bcdd 100644
--- a/kotlin-native/backend.native/tests/build.gradle
+++ b/kotlin-native/backend.native/tests/build.gradle
@@ -116,6 +116,7 @@ if (!isExperimentalMM) {
 
 tasks.withType(KonanCompileNativeBinary).configureEach {
     extraOpts "-XXLanguage:+ImplicitSignedToUnsignedIntegerConversion"
+    extraOpts "-opt-in=kotlinx.cinterop.ExperimentalForeignApi"
 }
 
 allprojects {
diff --git a/kotlin-native/backend.native/tests/codegen/bridges/nativePointed.kt b/kotlin-native/backend.native/tests/codegen/bridges/nativePointed.kt
index 00151feb2a4..c2a815119d6 100644
--- a/kotlin-native/backend.native/tests/codegen/bridges/nativePointed.kt
+++ b/kotlin-native/backend.native/tests/codegen/bridges/nativePointed.kt
@@ -1,8 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 package codegen.bridges.nativePointed
 
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/codegen/funInterface/kt43887.kt b/kotlin-native/backend.native/tests/codegen/funInterface/kt43887.kt
index e296bee93e5..3565bc145f2 100644
--- a/kotlin-native/backend.native/tests/codegen/funInterface/kt43887.kt
+++ b/kotlin-native/backend.native/tests/codegen/funInterface/kt43887.kt
@@ -1,8 +1,8 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 package codegen.funInterface.kt43887
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/codegen/intrinsics/interop_convert.kt b/kotlin-native/backend.native/tests/codegen/intrinsics/interop_convert.kt
index 722428b53b6..e26605c138a 100644
--- a/kotlin-native/backend.native/tests/codegen/intrinsics/interop_convert.kt
+++ b/kotlin-native/backend.native/tests/codegen/intrinsics/interop_convert.kt
@@ -1,5 +1,6 @@
-package codegen.intrinsics.interop_convert
 
+@file:OptIn(ExperimentalForeignApi::class)
+package codegen.intrinsics.interop_convert
 import kotlin.test.*
 import kotlinx.cinterop.*
 
diff --git a/kotlin-native/backend.native/tests/codegen/intrinsics/interop_sourceCodeStruct.kt b/kotlin-native/backend.native/tests/codegen/intrinsics/interop_sourceCodeStruct.kt
index be891194f47..9ce1bd29db1 100644
--- a/kotlin-native/backend.native/tests/codegen/intrinsics/interop_sourceCodeStruct.kt
+++ b/kotlin-native/backend.native/tests/codegen/intrinsics/interop_sourceCodeStruct.kt
@@ -1,3 +1,6 @@
+@file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class, kotlin.native.internal.InternalForKotlinNative::class)
+
 package codegen.intrinsics.interop_sourceCodeStruct
 
 import kotlinx.cinterop.*
@@ -5,8 +8,8 @@ import kotlinx.cinterop.internal.*
 import kotlin.test.*
 
 // Just making sure this doesn't get accidentally forbidden or otherwise broken.
-// (however defining structs this way is still strongly discouraged, please define
-// structs in C headers or .def files instead).
+// Used by auto-generated code, user-defined structs should be declared via
+// structs in C headers or .def files instead.
 
 @CStruct("struct { int p0; int p1; }")
 class S(rawPtr: NativePtr) : CStructVar(rawPtr) {
diff --git a/kotlin-native/backend.native/tests/filecheck/signext_zeroext_interop.kt b/kotlin-native/backend.native/tests/filecheck/signext_zeroext_interop.kt
index 16c6f0ce184..fc64e1548a9 100644
--- a/kotlin-native/backend.native/tests/filecheck/signext_zeroext_interop.kt
+++ b/kotlin-native/backend.native/tests/filecheck/signext_zeroext_interop.kt
@@ -1,7 +1,10 @@
 /*
- * 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.
+ * Copyright 2010-2023 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.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import signext_zeroext_interop_input.*
 import kotlinx.cinterop.*
 
diff --git a/kotlin-native/backend.native/tests/interop/auxiliary_sources/main.kt b/kotlin-native/backend.native/tests/interop/auxiliary_sources/main.kt
index 69873293e18..2bba4e61263 100644
--- a/kotlin-native/backend.native/tests/interop/auxiliary_sources/main.kt
+++ b/kotlin-native/backend.native/tests/interop/auxiliary_sources/main.kt
@@ -1,7 +1,9 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import auxiliaryCppSources.*
 import kotlin.test.*
 import kotlinx.cinterop.*
 
 fun main() {
     assertEquals(name()!!.toKString(), "Hello from C++")
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/0.kt b/kotlin-native/backend.native/tests/interop/basics/0.kt
index ffcda1a9244..2b6f4397d55 100644
--- a/kotlin-native/backend.native/tests/interop/basics/0.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/0.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import sysstat.*
 import kotlinx.cinterop.*
@@ -11,4 +12,4 @@ fun main(args: Array<String>) {
     val res = stat("/", statBuf.ptr)
     println(res)
     println(statBuf.st_uid)
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/1.kt b/kotlin-native/backend.native/tests/interop/basics/1.kt
index 5abf6cdce93..1738fc1b39e 100644
--- a/kotlin-native/backend.native/tests/interop/basics/1.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/1.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import cstdlib.*
 import kotlinx.cinterop.*
@@ -14,4 +15,4 @@ fun main(args: Array<String>) {
     println(quot)
     println(rem)
 
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/3.kt b/kotlin-native/backend.native/tests/interop/basics/3.kt
index 7f3cb8d81f4..3d38cf2db9d 100644
--- a/kotlin-native/backend.native/tests/interop/basics/3.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/3.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlinx.cinterop.*
 
diff --git a/kotlin-native/backend.native/tests/interop/basics/4.kt b/kotlin-native/backend.native/tests/interop/basics/4.kt
index f76c55105f1..135465f7199 100644
--- a/kotlin-native/backend.native/tests/interop/basics/4.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/4.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import cstdio.*
 import kotlinx.cinterop.*
@@ -19,4 +20,4 @@ fun main(args: Array<String>) {
         val sscanfResult = sscanf("42", "%d%d", aVar.ptr, bVar.ptr)
         printf("%d %d\n", sscanfResult, aVar.value)
     }
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/5.kt b/kotlin-native/backend.native/tests/interop/basics/5.kt
index a4b15a66c44..193dbbb6913 100644
--- a/kotlin-native/backend.native/tests/interop/basics/5.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/5.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import platform.posix.printf
 
diff --git a/kotlin-native/backend.native/tests/interop/basics/arrayPointers.kt b/kotlin-native/backend.native/tests/interop/basics/arrayPointers.kt
index 06ea7067b47..f33cdb3613d 100644
--- a/kotlin-native/backend.native/tests/interop/basics/arrayPointers.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/arrayPointers.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import carrayPointers.*
 import kotlin.test.*
 import kotlinx.cinterop.*
@@ -13,4 +15,4 @@ fun main() {
         struct.arrayPointer = globalArray
         assertEquals(globalArray[0], struct.arrayPointer!![0])
     }
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/available_processors.kt b/kotlin-native/backend.native/tests/interop/basics/available_processors.kt
index 8edab2948b1..d1a48d348c4 100644
--- a/kotlin-native/backend.native/tests/interop/basics/available_processors.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/available_processors.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 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.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlin.native.*
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/bf.kt b/kotlin-native/backend.native/tests/interop/basics/bf.kt
index 3729fd97349..ef6739c61e3 100644
--- a/kotlin-native/backend.native/tests/interop/basics/bf.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/bf.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import bitfields.*
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/callbacksAndVarargs.kt b/kotlin-native/backend.native/tests/interop/basics/callbacksAndVarargs.kt
index 5ac6aa863aa..30276377e53 100644
--- a/kotlin-native/backend.native/tests/interop/basics/callbacksAndVarargs.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/callbacksAndVarargs.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlin.test.*
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/echo_server.kt b/kotlin-native/backend.native/tests/interop/basics/echo_server.kt
index 347711e580d..fd73b1f125b 100644
--- a/kotlin-native/backend.native/tests/interop/basics/echo_server.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/echo_server.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlinx.cinterop.*
 import sockets.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/enums.kt b/kotlin-native/backend.native/tests/interop/basics/enums.kt
index e9569757171..b147bdab53e 100644
--- a/kotlin-native/backend.native/tests/interop/basics/enums.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/enums.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 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.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import cenums.*
 import kotlinx.cinterop.*
@@ -27,4 +28,4 @@ fun main() {
 //    assertEquals(entries[0], E.A)
 //    assertEquals(entries[1], E.B)
 //    assertEquals(entries[2], E.C)
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/funptr.kt b/kotlin-native/backend.native/tests/interop/basics/funptr.kt
index 6e1e677ba1c..b5e81736818 100644
--- a/kotlin-native/backend.native/tests/interop/basics/funptr.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/funptr.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlinx.cinterop.*
 import cfunptr.*
@@ -43,4 +44,4 @@ fun main(args: Array<String>) {
     printIntPtr(notSoLongSignatureFunction(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
 }
 
-fun Boolean.ifThenOneElseZero() = if (this) 1 else 0
\ No newline at end of file
+fun Boolean.ifThenOneElseZero() = if (this) 1 else 0
diff --git a/kotlin-native/backend.native/tests/interop/basics/globals.kt b/kotlin-native/backend.native/tests/interop/basics/globals.kt
index 9a48e87db72..dbb6696d925 100644
--- a/kotlin-native/backend.native/tests/interop/basics/globals.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/globals.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlinx.cinterop.*
 import cglobals.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/macros.kt b/kotlin-native/backend.native/tests/interop/basics/macros.kt
index 6497b3124f5..accb2730d87 100644
--- a/kotlin-native/backend.native/tests/interop/basics/macros.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/macros.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlin.test.*
 import cmacros.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/opengl_teapot.kt b/kotlin-native/backend.native/tests/interop/basics/opengl_teapot.kt
index 5c88879c897..c52795deafd 100644
--- a/kotlin-native/backend.native/tests/interop/basics/opengl_teapot.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/opengl_teapot.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlinx.cinterop.*
 import platform.GLUT.*
@@ -113,4 +114,4 @@ fun main(args: Array<String>) {
 
     // run GLUT mainloop
     glutMainLoop()
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/pinning.kt b/kotlin-native/backend.native/tests/interop/basics/pinning.kt
index ba1836dea0a..07842ee9cab 100644
--- a/kotlin-native/backend.native/tests/interop/basics/pinning.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/pinning.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlin.test.*
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/structAnonym.kt b/kotlin-native/backend.native/tests/interop/basics/structAnonym.kt
index ed0bc9afda5..38bdc271685 100644
--- a/kotlin-native/backend.native/tests/interop/basics/structAnonym.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/structAnonym.kt
@@ -1,3 +1,6 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
+
 import kotlinx.cinterop.*
 import kotlin.test.*
 import structAnonym.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/structs.kt b/kotlin-native/backend.native/tests/interop/basics/structs.kt
index 7beaed45590..ec56c26533c 100644
--- a/kotlin-native/backend.native/tests/interop/basics/structs.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/structs.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import cstructs.*
 import kotlinx.cinterop.*
 import kotlin.test.*
@@ -116,4 +118,4 @@ fun <T : E> checkEnumSubTyping(e: T) = memScoped {
 fun <T : Int> checkIntSubTyping(x: T) = memScoped {
     val s = alloc<Trivial>()
     s.i = x
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/toKString.kt b/kotlin-native/backend.native/tests/interop/basics/toKString.kt
index 69a49b763e6..c085b7d2d4b 100644
--- a/kotlin-native/backend.native/tests/interop/basics/toKString.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/toKString.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import ctoKString.*
 import kotlinx.cinterop.*
 import kotlin.native.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/types.kt b/kotlin-native/backend.native/tests/interop/basics/types.kt
index 46300f26cb5..68609c2c63c 100644
--- a/kotlin-native/backend.native/tests/interop/basics/types.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/types.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import kotlinx.cinterop.*
 import kotlin.native.*
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/union.kt b/kotlin-native/backend.native/tests/interop/basics/union.kt
index 9eb21d51921..ec115ff1766 100644
--- a/kotlin-native/backend.native/tests/interop/basics/union.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/union.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import cunion.*
 import kotlinx.cinterop.*
 import kotlin.native.*
@@ -33,4 +35,4 @@ fun main() {
         union.i = 0u
         assertEquals(0u, union.b)
     }
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/values.kt b/kotlin-native/backend.native/tests/interop/basics/values.kt
index 8a6e03941c8..36f409bf6bc 100644
--- a/kotlin-native/backend.native/tests/interop/basics/values.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/values.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import kotlinx.cinterop.*
 import kotlin.test.*
 import cvalues.*
@@ -7,4 +9,4 @@ fun main() {
     assertTrue(isNullWString(null))
     assertFalse(isNullString("a"))
     assertFalse(isNullWString("b"))
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/basics/vectors.kt b/kotlin-native/backend.native/tests/interop/basics/vectors.kt
index 60c0d019cc9..d7ec77daf07 100644
--- a/kotlin-native/backend.native/tests/interop/basics/vectors.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/vectors.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import kotlinx.cinterop.*
 import kotlin.native.*
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/withSpaces.kt b/kotlin-native/backend.native/tests/interop/basics/withSpaces.kt
index 71d8bee4a17..8a06281757f 100644
--- a/kotlin-native/backend.native/tests/interop/basics/withSpaces.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/withSpaces.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
 
diff --git a/kotlin-native/backend.native/tests/interop/cpp/cppClass.kt b/kotlin-native/backend.native/tests/interop/cpp/cppClass.kt
index ff5c014bb8d..f5ae5bf6245 100644
--- a/kotlin-native/backend.native/tests/interop/cpp/cppClass.kt
+++ b/kotlin-native/backend.native/tests/interop/cpp/cppClass.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import kotlinx.cinterop.*
 import kotlin.test.*
 
@@ -132,4 +134,4 @@ fun test2() {
 
 	println("x.useContents {iPub} = ${x.useContents {iPub}}" )
 }
-*/
\ No newline at end of file
+*/
diff --git a/kotlin-native/backend.native/tests/interop/cpp/skia.kt b/kotlin-native/backend.native/tests/interop/cpp/skia.kt
index 51f53492ee6..6eaae5734a4 100644
--- a/kotlin-native/backend.native/tests/interop/cpp/skia.kt
+++ b/kotlin-native/backend.native/tests/interop/cpp/skia.kt
@@ -1,3 +1,4 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 @file:Suppress("OPT_IN_USAGE_ERROR")
 
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/cpp/skiaSignature.kt b/kotlin-native/backend.native/tests/interop/cpp/skiaSignature.kt
index 426e0d54436..611f37d5f33 100644
--- a/kotlin-native/backend.native/tests/interop/cpp/skiaSignature.kt
+++ b/kotlin-native/backend.native/tests/interop/cpp/skiaSignature.kt
@@ -1,3 +1,4 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 @file:Suppress("OPT_IN_USAGE_ERROR")
 
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/cpp/types.kt b/kotlin-native/backend.native/tests/interop/cpp/types.kt
index 348144e94f0..15580e24292 100644
--- a/kotlin-native/backend.native/tests/interop/cpp/types.kt
+++ b/kotlin-native/backend.native/tests/interop/cpp/types.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import kotlinx.cinterop.*
 import kotlin.test.*
 import kotlin.random.*
diff --git a/kotlin-native/backend.native/tests/interop/exceptions/cCallback.kt b/kotlin-native/backend.native/tests/interop/exceptions/cCallback.kt
index 4a02d9e676f..c51d38e297c 100644
--- a/kotlin-native/backend.native/tests/interop/exceptions/cCallback.kt
+++ b/kotlin-native/backend.native/tests/interop/exceptions/cCallback.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import kotlinx.cinterop.staticCFunction
 import cCallback.runAndCatch
 
@@ -8,4 +10,4 @@ fun throwingCallback() {
 
 fun main() {
     runAndCatch(staticCFunction(::throwingCallback))
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/forwardDeclarations/forwardDeclarations.kt b/kotlin-native/backend.native/tests/interop/forwardDeclarations/forwardDeclarations.kt
index 312ae42befe..e38cde37f27 100644
--- a/kotlin-native/backend.native/tests/interop/forwardDeclarations/forwardDeclarations.kt
+++ b/kotlin-native/backend.native/tests/interop/forwardDeclarations/forwardDeclarations.kt
@@ -1,4 +1,5 @@
 // This test mostly checks frontend behaviour.
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import cForwardDeclarations.*
 import cnames.structs.StructDeclared
diff --git a/kotlin-native/backend.native/tests/interop/forwardDeclarationsTwoLibs/forwardDeclarationsTwoLibs.kt b/kotlin-native/backend.native/tests/interop/forwardDeclarationsTwoLibs/forwardDeclarationsTwoLibs.kt
index 814e38a1cfb..24ba5123abd 100644
--- a/kotlin-native/backend.native/tests/interop/forwardDeclarationsTwoLibs/forwardDeclarationsTwoLibs.kt
+++ b/kotlin-native/backend.native/tests/interop/forwardDeclarationsTwoLibs/forwardDeclarationsTwoLibs.kt
@@ -1,4 +1,5 @@
 // This test mostly checks frontend behaviour.
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import cForwardDeclarationsTwoLibs1.*
 import cForwardDeclarationsTwoLibs2.*
diff --git a/kotlin-native/backend.native/tests/interop/incomplete_types/main.kt b/kotlin-native/backend.native/tests/interop/incomplete_types/main.kt
index 11ac83e16d1..80d53c32a02 100644
--- a/kotlin-native/backend.native/tests/interop/incomplete_types/main.kt
+++ b/kotlin-native/backend.native/tests/interop/incomplete_types/main.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 import library.*
 import kotlinx.cinterop.*
 import kotlin.test.*
@@ -23,4 +25,4 @@ fun main() {
     for (i in 0 until arrayLength()) {
         assertEquals(0x1, array[i])
     }
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/interop/kt51925/kt51925_lib.kt b/kotlin-native/backend.native/tests/interop/kt51925/kt51925_lib.kt
index 5113481f17b..2751bc4d06c 100644
--- a/kotlin-native/backend.native/tests/interop/kt51925/kt51925_lib.kt
+++ b/kotlin-native/backend.native/tests/interop/kt51925/kt51925_lib.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 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.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kt51925.*
 import kotlinx.cinterop.*
@@ -20,4 +21,4 @@ inline fun foo2(): Int {
         s.d = 42
         return bar2(s)
     }
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/backend.native/tests/runtime/atomics/atomic_smoke.kt b/kotlin-native/backend.native/tests/runtime/atomics/atomic_smoke.kt
index d730a6a11ed..bd5483f8fee 100644
--- a/kotlin-native/backend.native/tests/runtime/atomics/atomic_smoke.kt
+++ b/kotlin-native/backend.native/tests/runtime/atomics/atomic_smoke.kt
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class)
+@file:OptIn(FreezingIsDeprecated::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 package runtime.atomics.atomic_smoke
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt
index 8aa90a0ac48..1b2a752337d 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt
@@ -2,7 +2,8 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class, kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class,
+        kotlin.native.runtime.NativeRuntimeApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.basic.cleaner_basic
 
diff --git a/kotlin-native/backend.native/tests/runtime/basic/simd.kt b/kotlin-native/backend.native/tests/runtime/basic/simd.kt
index 65b2ee3e064..d1310dc0298 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/simd.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/simd.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.basic.simd
 
diff --git a/kotlin-native/backend.native/tests/runtime/collections/array5.kt b/kotlin-native/backend.native/tests/runtime/collections/array5.kt
index 6b930a461e1..0128eaa0db0 100644
--- a/kotlin-native/backend.native/tests/runtime/collections/array5.kt
+++ b/kotlin-native/backend.native/tests/runtime/collections/array5.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.collections.array5
 
diff --git a/kotlin-native/backend.native/tests/runtime/interop/interop_alloc_value.kt b/kotlin-native/backend.native/tests/runtime/interop/interop_alloc_value.kt
index 65380eb5004..01f3bafd42b 100644
--- a/kotlin-native/backend.native/tests/runtime/interop/interop_alloc_value.kt
+++ b/kotlin-native/backend.native/tests/runtime/interop/interop_alloc_value.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
 package runtime.interop.interop_alloc_value
 
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/runtime/memory/gcStats.kt b/kotlin-native/backend.native/tests/runtime/memory/gcStats.kt
index f457695bd2f..158265e2c25 100644
--- a/kotlin-native/backend.native/tests/runtime/memory/gcStats.kt
+++ b/kotlin-native/backend.native/tests/runtime/memory/gcStats.kt
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-@file:OptIn(kotlin.ExperimentalStdlibApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.ExperimentalStdlibApi::class, kotlin.native.runtime.NativeRuntimeApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlin.native.runtime.GC
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt b/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt
index 71f6d9caede..388d16a7e71 100644
--- a/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt
+++ b/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.memory.stable_ref_cross_thread_check
 
diff --git a/kotlin-native/backend.native/tests/runtime/text/utf8.kt b/kotlin-native/backend.native/tests/runtime/text/utf8.kt
index ffbeabf8ccc..426e80e5b37 100644
--- a/kotlin-native/backend.native/tests/runtime/text/utf8.kt
+++ b/kotlin-native/backend.native/tests/runtime/text/utf8.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.text.utf8
 
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker10.kt b/kotlin-native/backend.native/tests/runtime/workers/worker10.kt
index 28ddd7e105f..8da022d9ccc 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker10.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker10.kt
@@ -1,4 +1,5 @@
-@file:OptIn(FreezingIsDeprecated::class, kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class)
+@file:OptIn(FreezingIsDeprecated::class, kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
+
 package runtime.workers.worker10
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker8.kt b/kotlin-native/backend.native/tests/runtime/workers/worker8.kt
index 3703795c4a2..b9b17d89151 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker8.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker8.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.workers.worker8
 
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/Throwable.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/Throwable.kt
index 2850b8f93b9..53636335463 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/Throwable.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/Throwable.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin
 
@@ -12,6 +13,7 @@ import kotlin.native.internal.ExportForCppRuntime
 import kotlin.native.internal.ExportTypeInfo
 import kotlin.native.internal.GCUnsafeCall
 import kotlin.native.internal.NativePtrArray
+import kotlinx.cinterop.ExperimentalForeignApi
 
 /**
  * The base class for all errors and exceptions. Only instances of this class can be thrown or caught.
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/concurrent/Atomics.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/concurrent/Atomics.kt
index 526984df52e..a7a330c5ce7 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/concurrent/Atomics.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/concurrent/Atomics.kt
@@ -6,6 +6,7 @@
 package kotlin.concurrent
 
 import kotlinx.cinterop.NativePtr
+import kotlinx.cinterop.ExperimentalForeignApi
 import kotlin.native.internal.*
 import kotlin.reflect.*
 import kotlin.concurrent.*
@@ -306,6 +307,7 @@ public class AtomicReference<T> {
 @Frozen
 @OptIn(FreezingIsDeprecated::class, ExperimentalStdlibApi::class)
 @SinceKotlin("1.9")
+@ExperimentalForeignApi
 public class AtomicNativePtr(@Volatile public var value: NativePtr) {
     /**
      * Atomically sets the value to the given [new value][newValue] and returns the old value.
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/Blob.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/Blob.kt
index ba7db889dc1..6408962fd78 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/Blob.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/Blob.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native
 
 import kotlin.native.internal.*
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Atomics.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Atomics.kt
index e5ee27fab32..79c6dcc9b56 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Atomics.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Atomics.kt
@@ -1,10 +1,12 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin.native.concurrent
 
+import kotlinx.cinterop.ExperimentalForeignApi
 import kotlinx.cinterop.NativePtr
 import kotlin.native.internal.*
 import kotlin.reflect.*
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Continuation.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Continuation.kt
index 35d6aa69d02..e6898f1787f 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Continuation.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Continuation.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin.native.concurrent
 
@@ -9,6 +10,9 @@ import kotlin.experimental.ExperimentalNativeApi
 import kotlin.native.internal.*
 import kotlinx.cinterop.*
 
+private const val DEPRECATED_API_MESSAGE = "This API is deprecated without replacement"
+
+@Deprecated(DEPRECATED_API_MESSAGE, level = DeprecationLevel.WARNING)
 @OptIn(FreezingIsDeprecated::class, ExperimentalNativeApi::class)
 public class Continuation0(block: () -> Unit,
                     private val invoker: CPointer<CFunction<(COpaquePointer?) -> Unit>>,
@@ -33,6 +37,7 @@ public class Continuation0(block: () -> Unit,
     }
 }
 
+@Deprecated(DEPRECATED_API_MESSAGE, level = DeprecationLevel.WARNING)
 @OptIn(FreezingIsDeprecated::class, ExperimentalNativeApi::class)
 public class Continuation1<T1>(
         block: (p1: T1) -> Unit,
@@ -65,6 +70,7 @@ public class Continuation1<T1>(
     }
 }
 
+@Deprecated(DEPRECATED_API_MESSAGE, level = DeprecationLevel.WARNING)
 @OptIn(FreezingIsDeprecated::class, ExperimentalNativeApi::class)
 public class Continuation2<T1, T2>(
         block: (p1: T1, p2: T2) -> Unit,
@@ -98,16 +104,20 @@ public class Continuation2<T1, T2>(
     }
 }
 
+
+@Deprecated(DEPRECATED_API_MESSAGE, level = DeprecationLevel.WARNING)
 public fun COpaquePointer.callContinuation0() {
     val single = this.asStableRef<() -> Unit>()
     single.get()()
 }
 
+@Deprecated(DEPRECATED_API_MESSAGE, level = DeprecationLevel.WARNING)
 public fun <T1> COpaquePointer.callContinuation1() {
     val pair = this.asStableRef<Pair<StableRef<(T1) -> Unit>, T1>>().get()
     pair.first.get()(pair.second)
 }
 
+@Deprecated(DEPRECATED_API_MESSAGE, level = DeprecationLevel.WARNING)
 public fun <T1, T2> COpaquePointer.callContinuation2() {
     val triple = this.asStableRef<Triple<StableRef<(T1, T2) -> Unit>, T1, T2>>().get()
     triple.first.get()(triple.second, triple.third)
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt
index 0bb956517e9..001dedf9eee 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt
@@ -1,8 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.concurrent
 
 import kotlin.experimental.ExperimentalNativeApi
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Lazy.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Lazy.kt
index a342be2eea0..b67fd698191 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Lazy.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Lazy.kt
@@ -1,16 +1,19 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
 
 @file:Suppress("DEPRECATION")
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.concurrent
 
 import kotlin.experimental.ExperimentalNativeApi
 import kotlin.native.internal.Frozen
 import kotlin.concurrent.AtomicReference
+import kotlinx.cinterop.ExperimentalForeignApi
 
 @FreezingIsDeprecated
+
 internal class FreezeAwareLazyImpl<out T>(initializer: () -> T) : Lazy<T> {
     private val value_ = FreezableAtomicReference<Any?>(UNINITIALIZED)
     // This cannot be made atomic because of the legacy MM. See https://github.com/JetBrains/kotlin-native/pull/3944
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/MutableData.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/MutableData.kt
index 2592d7394a2..cddc0508942 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/MutableData.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/MutableData.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin.native.concurrent
 
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/ObjectTransfer.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/ObjectTransfer.kt
index 794400c0a54..345837bc9fb 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/ObjectTransfer.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/ObjectTransfer.kt
@@ -1,8 +1,8 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.concurrent
 
 import kotlinx.cinterop.*
@@ -77,6 +77,7 @@ public class DetachedObjectGraph<T> internal constructor(pointer: NativePtr) {
     /**
      * Returns raw C pointer value, usable for interoperability with C scenarious.
      */
+    @ExperimentalForeignApi
     public fun asCPointer(): COpaquePointer? = interpretCPointer<COpaque>(stable.value)
 }
 
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Worker.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Worker.kt
index 55dfd02de4d..37b0687d190 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Worker.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Worker.kt
@@ -1,8 +1,8 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.concurrent
 
 import kotlin.experimental.ExperimentalNativeApi
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/WorkerBoundReference.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/WorkerBoundReference.kt
index 7c8124cbcdb..58a47c07f0e 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/WorkerBoundReference.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/WorkerBoundReference.kt
@@ -1,11 +1,13 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin.native.concurrent
 
 import kotlin.native.internal.*
+import kotlinx.cinterop.ExperimentalForeignApi
 
 @GCUnsafeCall("Kotlin_WorkerBoundReference_create")
 @ObsoleteWorkersApi
@@ -35,6 +37,7 @@ external private fun describeWorkerBoundReference(ref: NativePtr): String
 @HasFreezeHook
 @FreezingIsDeprecated
 @ObsoleteWorkersApi
+@OptIn(ExperimentalForeignApi::class)
 public class WorkerBoundReference<out T : Any>(value: T) {
 
     private var ptr = NativePtr.NULL
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Intrinsics.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Intrinsics.kt
index 946662ba452..ab5dfac0703 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Intrinsics.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Intrinsics.kt
@@ -1,13 +1,15 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin.native.internal
 
 import kotlinx.cinterop.CPointer
 import kotlinx.cinterop.NativePointed
 import kotlinx.cinterop.NativePtr
+import kotlinx.cinterop.ExperimentalForeignApi
 
 import kotlin.native.internal.TypedIntrinsic
 import kotlin.native.internal.IntrinsicType
@@ -32,4 +34,4 @@ import kotlin.native.internal.IntrinsicType
 @TypedIntrinsic(IntrinsicType.IDENTITY) @PublishedApi external internal fun <T, R> T.reinterpret(): R
 
 
-@TypedIntrinsic(IntrinsicType.THE_UNIT_INSTANCE) @ExportForCompiler external internal fun theUnitInstance(): Unit
\ No newline at end of file
+@TypedIntrinsic(IntrinsicType.THE_UNIT_INSTANCE) @ExportForCompiler external internal fun theUnitInstance(): Unit
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/KClassImpl.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/KClassImpl.kt
index df75b3821a1..4e37bd65c37 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/KClassImpl.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/KClassImpl.kt
@@ -1,11 +1,13 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin.native.internal
 
 import kotlin.reflect.KClass
+import kotlinx.cinterop.*
 
 @ExportForCompiler
 internal class KClassImpl<T : Any>(private val typeInfo: NativePtr) : KClass<T> {
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/NativePtr.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/NativePtr.kt
index 6b836fb525e..1862865b0d4 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/NativePtr.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/NativePtr.kt
@@ -1,16 +1,19 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 @file:Suppress("RESERVED_MEMBER_INSIDE_VALUE_CLASS")
 
 package kotlin.native.internal
 
+import kotlinx.cinterop.*
+
 @TypedIntrinsic(IntrinsicType.INTEROP_GET_NATIVE_NULL_PTR)
 @PublishedApi
 internal external fun getNativeNullPtr(): NativePtr
 
+@ExperimentalForeignApi
 class NativePtr @PublishedApi internal constructor(private val value: NonNullNativePtr?) {
     companion object {
         // TODO: make it properly precreated, maybe use an intrinsic for that.
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/ObjCExportCoroutines.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/ObjCExportCoroutines.kt
index 5fae512f7b5..5ded07f0ab7 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/ObjCExportCoroutines.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/ObjCExportCoroutines.kt
@@ -1,11 +1,12 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.internal
 
 import kotlin.experimental.ExperimentalNativeApi
+import kotlinx.cinterop.ExperimentalForeignApi
 import kotlin.coroutines.*
 import kotlin.coroutines.intrinsics.*
 import kotlin.coroutines.native.internal.*
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/RuntimeUtils.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/RuntimeUtils.kt
index e2d199073b4..338e3593494 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/RuntimeUtils.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/RuntimeUtils.kt
@@ -1,7 +1,8 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 @file:Suppress("DEPRECATION", "DEPRECATION_ERROR") // Char.toInt()
 package kotlin.native.internal
@@ -10,6 +11,7 @@ import kotlin.experimental.ExperimentalNativeApi
 import kotlin.internal.getProgressionLastElement
 import kotlin.reflect.KClass
 import kotlin.native.concurrent.freeze
+import kotlinx.cinterop.*
 import kotlin.native.concurrent.FreezableAtomicReference
 
 @ExportForCppRuntime
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Utils.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Utils.kt
index a977c41d1b6..95d7e185d6e 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Utils.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/Utils.kt
@@ -1,11 +1,13 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(ExperimentalForeignApi::class)
 
 package kotlin.native.internal
 
 import kotlin.reflect.KClass
+import kotlinx.cinterop.*
 
 @ExportForCppRuntime
 internal fun DescribeObjectForDebugging(typeInfo: NativePtr, address: NativePtr): String {
@@ -51,4 +53,4 @@ public fun Any.collectReferenceFieldValues() : List<Any> {
             getObjectReferenceFieldByIndex(this@collectReferenceFieldValues, it)
         }
     }
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/Cleaner.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/Cleaner.kt
index a4e76320d0d..7653a9423c8 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/Cleaner.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/Cleaner.kt
@@ -3,12 +3,14 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.ref
 
 import kotlin.experimental.ExperimentalNativeApi
 import kotlin.native.concurrent.*
 import kotlin.native.internal.*
 import kotlinx.cinterop.NativePtr
+import kotlinx.cinterop.*
 
 /**
  * The marker interface for objects that have a cleanup action associated with them.
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/WeakPrivate.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/WeakPrivate.kt
index fc3ee149ad8..22254aa2c11 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/WeakPrivate.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/ref/WeakPrivate.kt
@@ -1,11 +1,11 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.ref
 
-import kotlinx.cinterop.COpaquePointer
+import kotlinx.cinterop.*
 import kotlin.native.internal.*
 
 /**
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/runtime/GCInfo.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/runtime/GCInfo.kt
index 1ea9764c492..92d22b72c32 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/runtime/GCInfo.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/runtime/GCInfo.kt
@@ -3,6 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlin.native.runtime
 
 import kotlin.native.internal.*
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/simd.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/simd.kt
index 866d8e4c2a5..d2ca6a3d3f5 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/simd.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/simd.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
 package kotlin.native
@@ -7,8 +7,10 @@ package kotlin.native
 import kotlin.native.internal.GCUnsafeCall
 import kotlin.native.internal.TypedIntrinsic
 import kotlin.native.internal.IntrinsicType
+import kotlinx.cinterop.ExperimentalForeignApi
 
 
+@ExperimentalForeignApi
 public final class Vector128 private constructor() {
     @TypedIntrinsic(IntrinsicType.EXTRACT_ELEMENT)
     external fun getByteAt(index: Int): Byte
@@ -52,8 +54,10 @@ public final class Vector128 private constructor() {
     }
 }
 
+@ExperimentalForeignApi
 @GCUnsafeCall("Kotlin_Vector4f_of")
 external fun vectorOf(f0: Float, f1: Float, f2: Float, f3: Float): Vector128
 
+@ExperimentalForeignApi
 @GCUnsafeCall("Kotlin_Vector4i32_of")
 external fun vectorOf(f0: Int, f1: Int, f2: Int, f3: Int): Vector128