Rework interop callbacks

*   Do not rely on type inference and `CFunctionType`;
*   Represent struct-typed parameters and return values as `CValue<*>`
    (currently supported only on JVM).

INTEROP.md

@@ -275,14 +275,7 @@ methods available:
 ### Callbacks ###
 
 To convert Kotlin function to pointer to C function,
-`staticCFunction(::kotlinFunction)` can be used. Currently `staticCFunction`
-heavily relies on type inference, so the expression `staticCFunction(...)`
-should be either assigned to the variable having proper type explicitly
-specified, or passed to the function, e.g.
-
-```
-glutDisplayFunc(staticCFunction(::display))
-```
+`staticCFunction(::kotlinFunction)` can be used.
 
 Note that some function types are not supported currently. For example,
 it is not possible to get pointer to function that receives or returns structs

Interop/Indexer/src/main/kotlin/org/jetbrains/kotlin/native/interop/indexer/Utils.kt

@@ -137,7 +137,7 @@ internal fun visitChildren(parent: CValue<CXCursor>, visitor: CursorVisitor) {
     clang_visitChildren(parent, staticCFunction { cursor, parent, clientData ->
         @Suppress("NAME_SHADOWING", "UNCHECKED_CAST")
         val visitor = StableObjPtr.fromValue(clientData!!).get() as CursorVisitor
-        visitor(cursor.readValue(), parent.readValue())
+        visitor(cursor, parent)
     }, clientData)
 }
 

Interop/Runtime/src/jvm/kotlin/kotlinx/cinterop/JvmCallbacks.kt

@@ -16,6 +16,15 @@
 
 package kotlinx.cinterop
 
+import java.util.concurrent.ConcurrentHashMap
+import kotlin.reflect.KClass
+import kotlin.reflect.KFunction
+import kotlin.reflect.KType
+import kotlin.reflect.full.companionObjectInstance
+import kotlin.reflect.full.declaredMemberProperties
+import kotlin.reflect.full.isSubclassOf
+import kotlin.reflect.jvm.reflect
+
 /**
  * This class provides a way to create a stable handle to any Kotlin object.
  * Its [value] can be safely passed to native code e.g. to be received in a Kotlin callback.
@@ -59,112 +68,348 @@ data class StableObjPtr private constructor(val value: COpaquePointer) {
 
 }
 
-/**
- * Describes the type of C function with adapter for Kotlin functions.
- *
- * The instances of this class are supposed to be Kotlin object declarations (singletons),
- * because it is required by [CAdaptedFunctionType] and
- * because creating the instance implies allocating some amount of non-freeable memory for the instance itself
- * and for any unique Kotlin function "converted" to this type.
- *
- * Native function type definition consists in the following:
- * -   Definitions of native function's parameter and return types to be passed into the constructor
- * -   Implementation of [invoke] method which describes how to convert between these types and Kotlin types used in [F]
- *
- * @param F Kotlin function type corresponding to given native function type
- */
-abstract class CAdaptedFunctionTypeImpl<F : Function<*>>
-        protected constructor(returnType: CType, vararg paramTypes: CType) : CAdaptedFunctionType<F> {
-
-    override fun fromStatic(function: F): NativePtr {
-        // TODO: optimize synchronization
-        synchronized(cache) {
-            return cache.getOrPut(function, { createFromStatic(function) })
-        }
+private fun getFieldCType(type: KType): CType<*> {
+    val classifier = type.classifier
+    if (classifier is KClass<*> && classifier.isSubclassOf(CStructVar::class)) {
+        return getStructCType(classifier)
     }
 
-    /**
-     * Describes the C type of a function's parameter or return value.
-     * It is supposed to be constructed using the primitive types (such as [SInt32]) and the [Struct] combinator.
-     *
-     * This description omits the details that are irrelevant for the ABI.
-     */
-    protected open class CType internal constructor(val ffiType: ffi_type) {
-        internal constructor(ffiTypePtr: Long) : this(interpretPointed<ffi_type>(ffiTypePtr))
-    }
-
-    protected object Void    : CType(ffiTypeVoid())
-    protected object UInt8   : CType(ffiTypeUInt8())
-    protected object SInt8   : CType(ffiTypeSInt8())
-    protected object UInt16  : CType(ffiTypeUInt16())
-    protected object SInt16  : CType(ffiTypeSInt16())
-    protected object UInt32  : CType(ffiTypeUInt32())
-    protected object SInt32  : CType(ffiTypeSInt32())
-    protected object UInt64  : CType(ffiTypeUInt64())
-    protected object SInt64  : CType(ffiTypeSInt64())
-    protected object Pointer : CType(ffiTypePointer())
-
-    protected class Struct(vararg elementTypes: CType) : CType(
-            ffiTypeStruct(
-                    elementTypes.map { it.ffiType }
-            )
-    )
-
-    /**
-     * This method should invoke given Kotlin function.
-     *
-     * @param args array of pointers to arguments to be passed to [function]
-     * @param ret pointer to memory to be filled with return value of [function]
-     */
-    protected abstract fun invoke(function: F, args: CArrayPointer<COpaquePointerVar>, ret: COpaquePointer)
-
-    companion object {
-        init {
-            loadCallbacksLibrary()
-        }
-    }
-
-    private val ffiCif = ffiCreateCif(returnType.ffiType, paramTypes.map { it.ffiType })
-
-    /**
-     * Allocates a native function of this type for given Kotlin function.
-     */
-    private fun createFromStatic(function: F): NativePtr {
-        if (!isStatic(function)) {
-            throw IllegalArgumentException()
-        }
-
-        val impl: UserData = { ret: COpaquePointer, args: CArrayPointer<COpaquePointerVar> ->
-            invoke(function, args, ret)
-        }
-
-        return ffiCreateClosure(ffiCif, impl)
-    }
-
-    /**
-     * Returns `true` if given function is *static* as defined in [fromStatic].
-     */
-    private fun isStatic(function: Function<*>): Boolean {
-        // TODO: revise
-        try {
-            with(function.javaClass.getDeclaredField("INSTANCE")) {
-                if (!java.lang.reflect.Modifier.isStatic(modifiers) || !java.lang.reflect.Modifier.isFinal(modifiers)) {
-                    return false
-                }
-
-                isAccessible = true // TODO: undo
-
-                return get(null) == function
-            }
-        } catch (e: NoSuchFieldException) {
-            return false
-        }
-    }
-
-    private val cache = mutableMapOf<F, NativePtr>()
+    return getArgOrRetValCType(type)
 }
 
-private typealias UserData = (ret: COpaquePointer, args: CArrayPointer<COpaquePointerVar>)->Unit
+private fun getVariableCType(type: KType): CType<*>? {
+    val classifier = type.classifier
+    return when (classifier) {
+        !is KClass<*> -> null
+        ByteVarOf::class -> SInt8
+        ShortVarOf::class -> SInt16
+        IntVarOf::class -> SInt32
+        LongVarOf::class -> SInt64
+        CPointerVarOf::class -> Pointer
+        // TODO: floats, enums.
+        else -> if (classifier.isSubclassOf(CStructVar::class)) {
+            getStructCType(classifier)
+        } else {
+            null
+        }
+    }
+}
+
+private val structTypeCache = ConcurrentHashMap<Class<*>, CType<*>>()
+
+private fun getStructCType(structClass: KClass<*>): CType<*> = structTypeCache.computeIfAbsent(structClass.java) {
+    // Note that struct classes are not supposed to be user-defined,
+    // so they don't require to be checked strictly.
+
+    val annotations = structClass.annotations
+    val cNaturalStruct = annotations.filterIsInstance<CNaturalStruct>().firstOrNull() ?:
+            error("struct ${structClass.simpleName} has custom layout")
+
+    val propertiesByName = structClass.declaredMemberProperties.groupBy { it.name }
+
+    val fields = cNaturalStruct.fieldNames.map {
+        propertiesByName[it]!!.single()
+    }
+
+    val fieldCTypes = mutableListOf<CType<*>>()
+
+    for (field in fields) {
+        val lengthAnnotation = field.annotations.filterIsInstance<CLength>().firstOrNull()
+        if (lengthAnnotation == null) {
+            val fieldType = getFieldCType(field.returnType)
+            fieldCTypes.add(fieldType)
+        } else {
+            assert(field.returnType.classifier == CPointer::class)
+            val length = lengthAnnotation.value
+            if (length != 0) {
+                val pointed = field.returnType.arguments.single().type!!
+                val pointedCType = getVariableCType(pointed) ?: TODO("array element type '$pointed'")
+
+                // Represent array field as repeated element-typed fields:
+                repeat(length) {
+                    fieldCTypes.add(pointedCType)
+                }
+            }
+        }
+    }
+
+    val structType = structClass.companionObjectInstance as CVariable.Type
+
+    Struct(structType.size, structType.align, fieldCTypes)
+}
+
+private fun getStructValueCType(type: KType): CType<*> {
+    val structClass = type.arguments.singleOrNull()?.type?.classifier as? KClass<*> ?:
+            error("'$type' type is incomplete")
+
+    return getStructCType(structClass)
+}
+
+private fun getEnumCType(classifier: KClass<*>): CEnumType? {
+    val rawValueType = classifier.declaredMemberProperties.single().returnType
+
+    val rawValueCType = when (rawValueType.classifier) {
+        Byte::class -> SInt8
+        Short::class -> SInt16
+        Int::class -> SInt32
+        Long::class -> SInt64
+        else -> error("'${classifier.simpleName}' has unexpected value type '$rawValueType'")
+    }
+
+    @Suppress("UNCHECKED_CAST")
+    return CEnumType(rawValueCType as CType<Number>)
+}
+
+private fun getArgOrRetValCType(type: KType): CType<*> {
+    val classifier = type.classifier
+
+    val result = when (classifier) {
+        !is KClass<*> -> null
+        Unit::class -> Void
+        Byte::class -> SInt8
+        Short::class -> SInt16
+        Int::class -> SInt32
+        Long::class -> SInt64
+        CPointer::class -> Pointer
+        // TODO: floats
+        CValue::class -> getStructValueCType(type)
+        else -> if (classifier.isSubclassOf(CEnum::class)) {
+            getEnumCType(classifier)
+        } else {
+            null
+        }
+    } ?: error("$type is not supported in callback signature")
+
+    if (type.isMarkedNullable != (classifier == CPointer::class)) {
+        if (type.isMarkedNullable) {
+            error("$type must not be nullable when used in callback signature")
+        } else {
+            error("$type must be nullable when used in callback signature")
+        }
+    }
+
+    return result
+}
+
+private fun createStaticCFunction(function: Function<*>): CPointer<CFunction<*>> {
+    val errorMessage = "staticCFunction must take an unbound, non-capturing function"
+
+    if (!isStatic(function)) {
+        throw IllegalArgumentException(errorMessage)
+    }
+
+    val kFunction = function as? KFunction<*> ?: function.reflect() ?:
+            throw IllegalArgumentException(errorMessage)
+
+    val returnType = getArgOrRetValCType(kFunction.returnType)
+    val paramTypes = kFunction.parameters.map { getArgOrRetValCType(it.type) }
+
+    @Suppress("UNCHECKED_CAST")
+    return interpretCPointer(createStaticCFunctionImpl(returnType as CType<Any?>, paramTypes, function))!!
+}
+
+/**
+ * Returns `true` if given function is *static* as defined in [staticCFunction].
+ */
+private fun isStatic(function: Function<*>): Boolean {
+    // TODO: revise
+    try {
+        with(function.javaClass.getDeclaredField("INSTANCE")) {
+            if (!java.lang.reflect.Modifier.isStatic(modifiers) || !java.lang.reflect.Modifier.isFinal(modifiers)) {
+                return false
+            }
+
+            isAccessible = true // TODO: undo
+
+            return get(null) == function
+
+            // If the class has static final "INSTANCE" field, and only the value of this field is accepted,
+            // then each class is handled at most once, so these checks prevent memory leaks.
+        }
+    } catch (e: NoSuchFieldException) {
+        return false
+    }
+}
+
+private val createdStaticFunctions = ConcurrentHashMap<Class<*>, CPointer<CFunction<*>>>()
+
+@Suppress("UNCHECKED_CAST")
+internal fun <F : Function<*>> staticCFunctionImpl(function: F) =
+        createdStaticFunctions.computeIfAbsent(function.javaClass) {
+            createStaticCFunction(function)
+        } as CPointer<CFunction<F>>
+
+private val invokeMethods = (0 .. 22).map { arity ->
+    Class.forName("kotlin.jvm.functions.Function$arity").getMethod("invoke",
+            *Array<Class<*>>(arity) { java.lang.Object::class.java })
+}
+
+private fun createStaticCFunctionImpl(
+        returnType: CType<Any?>,
+        paramTypes: List<CType<*>>,
+        function: Function<*>
+): NativePtr {
+    val ffiCif = ffiCreateCif(returnType.ffiType, paramTypes.map { it.ffiType })
+
+    val arity = paramTypes.size
+    val pt = paramTypes.toTypedArray()
+
+    @Suppress("UNCHECKED_CAST")
+    val impl: FfiClosureImpl = when (arity) {
+        0 -> {
+            val f = function as () -> Any?
+            ffiClosureImpl(returnType) { args ->
+                f()
+            }
+        }
+        1 -> {
+            val f = function as (Any?) -> Any?
+            ffiClosureImpl(returnType) { args ->
+                f(pt.read(args, 0))
+            }
+        }
+        2 -> {
+            val f = function as (Any?, Any?) -> Any?
+            ffiClosureImpl(returnType) { args ->
+                f(pt.read(args, 0), pt.read(args, 1))
+            }
+        }
+        3 -> {
+            val f = function as (Any?, Any?, Any?) -> Any?
+            ffiClosureImpl(returnType) { args ->
+                f(pt.read(args, 0), pt.read(args, 1), pt.read(args, 2))
+            }
+        }
+        4 -> {
+            val f = function as (Any?, Any?, Any?, Any?) -> Any?
+            ffiClosureImpl(returnType) { args ->
+                f(pt.read(args, 0), pt.read(args, 1), pt.read(args, 2), pt.read(args, 3))
+            }
+        }
+        5 -> {
+            val f = function as (Any?, Any?, Any?, Any?, Any?) -> Any?
+            ffiClosureImpl(returnType) { args ->
+                f(pt.read(args, 0), pt.read(args, 1), pt.read(args, 2), pt.read(args, 3), pt.read(args, 4))
+            }
+        }
+        else -> {
+            val invokeMethod = invokeMethods[arity]
+            ffiClosureImpl(returnType) { args ->
+                val arguments = Array(arity) { pt.read(args, it) }
+                invokeMethod.invoke(function, *arguments)
+            }
+        }
+    }
+    return ffiCreateClosure(ffiCif, impl)
+}
+
+@Suppress("NOTHING_TO_INLINE")
+private inline fun Array<CType<*>>.read(args: CArrayPointer<COpaquePointerVar>, index: Int) =
+    this[index].read(args[index].rawValue)
+
+private inline fun ffiClosureImpl(
+        returnType: CType<Any?>,
+        crossinline invoke: (args: CArrayPointer<COpaquePointerVar>) -> Any?
+): FfiClosureImpl {
+    return { ret, args ->
+        val result = invoke(args)
+        returnType.write(ret.rawValue, result)
+    }
+}
+
+/**
+ * Describes the bridge between Kotlin type `T` and the corresponding C type of a function's parameter or return value.
+ * It is supposed to be constructed using the primitive types (such as [SInt32]), the [Struct] combinator
+ * and the [CEnumType] wrapper.
+ *
+ * This description omits the details that are irrelevant for the ABI.
+ */
+private abstract class CType<T> internal constructor(val ffiType: ffi_type) {
+    internal constructor(ffiTypePtr: Long) : this(interpretPointed<ffi_type>(ffiTypePtr))
+    abstract fun read(location: NativePtr): T
+    abstract fun write(location: NativePtr, value: T): Unit
+}
+
+private object Void : CType<Any?>(ffiTypeVoid()) {
+    override fun read(location: NativePtr) = throw UnsupportedOperationException()
+
+    override fun write(location: NativePtr, value: Any?) {
+        // nothing to do.
+    }
+}
+
+private object SInt8 : CType<Byte>(ffiTypeSInt8()) {
+    override fun read(location: NativePtr) = interpretPointed<ByteVar>(location).value
+    override fun write(location: NativePtr, value: Byte) {
+        interpretPointed<ByteVar>(location).value = value
+    }
+}
+
+private object SInt16 : CType<Short>(ffiTypeSInt16()) {
+    override fun read(location: NativePtr) = interpretPointed<ShortVar>(location).value
+    override fun write(location: NativePtr, value: Short) {
+        interpretPointed<ShortVar>(location).value = value
+    }
+}
+
+private object SInt32 : CType<Int>(ffiTypeSInt32()) {
+    override fun read(location: NativePtr) = interpretPointed<IntVar>(location).value
+    override fun write(location: NativePtr, value: Int) {
+        interpretPointed<IntVar>(location).value = value
+    }
+}
+
+private object SInt64 : CType<Long>(ffiTypeSInt64()) {
+    override fun read(location: NativePtr) = interpretPointed<LongVar>(location).value
+    override fun write(location: NativePtr, value: Long) {
+        interpretPointed<LongVar>(location).value = value
+    }
+}
+private object Pointer : CType<CPointer<*>?>(ffiTypePointer()) {
+    override fun read(location: NativePtr) = interpretPointed<CPointerVar<*>>(location).value
+    override fun write(location: NativePtr, value: CPointer<*>?) {
+        interpretPointed<CPointerVar<*>>(location).value = value
+    }
+}
+
+private class Struct(val size: Long, val align: Int, elementTypes: List<CType<*>>) : CType<CValue<*>>(
+        ffiTypeStruct(
+                elementTypes.map { it.ffiType }
+        )
+) {
+    override fun read(location: NativePtr) = interpretPointed<ByteVar>(location).readValue<CStructVar>(size, align)
+
+    override fun write(location: NativePtr, value: CValue<*>) {
+        // TODO: probably CValue must be redesigned.
+        val fakePlacement = object : NativePlacement {
+            var used = false
+            override fun alloc(size: Long, align: Int): NativePointed {
+                assert(!used)
+                assert (size == this@Struct.size)
+                assert (align == this@Struct.align)
+                used = true
+                return interpretPointed<ByteVar>(location)
+            }
+        }
+
+        value.getPointer(fakePlacement)
+        assert (fakePlacement.used)
+    }
+}
+
+private class CEnumType(private val rawValueCType: CType<Number>) : CType<CEnum>(rawValueCType.ffiType) {
+
+    override fun read(location: NativePtr): CEnum {
+        TODO("enum-typed callback parameters")
+    }
+
+    override fun write(location: NativePtr, value: CEnum) {
+        rawValueCType.write(location, value.value)
+    }
+}
+
+private typealias FfiClosureImpl = (ret: COpaquePointer, args: CArrayPointer<COpaquePointerVar>)->Unit
+private typealias UserData = FfiClosureImpl
 
 private fun loadCallbacksLibrary() {
     System.loadLibrary("callbacks")
@@ -233,7 +478,7 @@ private fun ffiCreateCif(returnType: ffi_type, paramTypes: List<ffi_type>): ffi_
     return interpretPointed(res)
 }
 
-@Suppress("UNUSED_PARAMETER")
+@Suppress("UNUSED_PARAMETER", "UNUSED")
 private fun ffiFunImpl0(ffiCif: Long, ret: Long, args: Long, userData: Any) {
     @Suppress("UNCHECKED_CAST")
     ffiFunImpl(interpretCPointer(ret)!!,
@@ -259,8 +504,8 @@ private external fun ffiCreateClosure0(ffiCif: Long, userData: Any): Long
  *
  * @param ffiCif describes the type of the function to create
  */
-private fun ffiCreateClosure(ffiCif: ffi_cif, userData: UserData): NativePtr {
-    val res = ffiCreateClosure0(ffiCif.rawPtr, userData)
+private fun ffiCreateClosure(ffiCif: ffi_cif, impl: FfiClosureImpl): NativePtr {
+    val res = ffiCreateClosure0(ffiCif.rawPtr, userData = impl)
 
     when (res) {
         0L -> throw OutOfMemoryError()

Interop/Runtime/src/jvm/kotlin/kotlinx/cinterop/JvmTypes.kt

@@ -52,17 +52,81 @@ fun <T : CPointed> interpretCPointer(rawValue: NativePtr) =
             CPointer<T>(rawValue)
         }
 
-inline fun <reified T : CAdaptedFunctionType<*>> CAdaptedFunctionType.Companion.getInstanceOf(): T =
-        T::class.objectInstance!!
-
 internal fun CPointer<*>.cPointerToString() = "CPointer(raw=0x%x)".format(rawValue)
 
-/**
- * Returns a pointer to `T`-typed C function which calls given Kotlin *static* function.
- * @see CAdaptedFunctionType.fromStatic
- */
-inline fun <reified F : Function<*>, reified T : CAdaptedFunctionType<F>> staticCFunction(body: F): CFunctionPointer<T> {
-    val type = CAdaptedFunctionType.getInstanceOf<T>()
-    return interpretPointed<CFunction<T>>(type.fromStatic(body)).ptr
-}
+@Target(AnnotationTarget.PROPERTY)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class CLength(val value: Int)
 
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class CNaturalStruct(vararg val fieldNames: String)
+
+fun <R> staticCFunction(function: () -> R): CPointer<CFunction<() -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, R> staticCFunction(function: (P1) -> R): CPointer<CFunction<(P1) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, R> staticCFunction(function: (P1, P2) -> R): CPointer<CFunction<(P1, P2) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, R> staticCFunction(function: (P1, P2, P3) -> R): CPointer<CFunction<(P1, P2, P3) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, R> staticCFunction(function: (P1, P2, P3, P4) -> R): CPointer<CFunction<(P1, P2, P3, P4) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, R> staticCFunction(function: (P1, P2, P3, P4, P5) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6, P7) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6, P7, P8) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6, P7, P8, P9) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9) -> R>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, R> staticCFunction(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>> =
+        staticCFunctionImpl(function)
+
+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(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>> =
+        staticCFunctionImpl(function)

Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Types.kt

@@ -381,43 +381,16 @@ inline operator fun <T : CPointer<*>> CPointer<CPointerVarOf<T>>.set(index: Long
 typealias CArrayPointer<T> = CPointer<T>
 typealias CArrayPointerVar<T> = CPointerVar<T>
 
-/**
- * The type of C function.
- */
-interface CFunctionType
-
-/**
- * The type of C function constructed from some Kotlin function, possibly using an adapter.
- * The (non-abstract) implementation classes are supposed to be object declarations.
- */
-interface CAdaptedFunctionType<F : Function<*>> : CFunctionType {
-
-    /**
-     * Returns a raw pointer to C function of this type, which calls given Kotlin *static* function.
-     *
-     * This inconvenient method should not be used directly; use [staticCFunction] instead.
-     *
-     * @param function must be *static*, i.e. an (unbound) reference to a Kotlin function or
-     * a closure which doesn't capture any variable
-     */
-    fun fromStatic(function: F): NativePtr
-
-    companion object
-}
-
 /**
  * The C function.
  */
-class CFunction<T : CFunctionType>(override val rawPtr: NativePtr) : CPointed
+class CFunction<T : Function<*>>(override val rawPtr: NativePtr) : CPointed
 
 /**
- * The pointer to [CFunction].
- * TODO: remove.
+ * Returns a pointer to C function which calls given Kotlin *static* function.
+ *
+ * @param function must be *static*, i.e. an (unbound) reference to a Kotlin function or
+ * a closure which doesn't capture any variable
  */
-typealias CFunctionPointer<T> = CPointer<CFunction<T>>
-
-/**
- * The variable containing a [CFunctionPointer].
- * TODO: remove.
- */
-typealias CFunctionPointerVar<T> = CPointerVarOf<CFunctionPointer<T>>
+@Deprecated("The function type is too general. Supply argument with known arity.", level = DeprecationLevel.ERROR)
+external fun <F : Function<*>> staticCFunction(function: F): CPointer<CFunction<F>>

Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeCallbacks.kt

@@ -45,12 +45,3 @@ private external fun disposeStablePointer(pointer: COpaquePointer)
 
 @SymbolName("Kotlin_Interop_derefStablePointer")
 private external fun derefStablePointer(pointer: COpaquePointer): Any
-
-/**
- * The type of C function which can be constructed from the appropriate Kotlin function without using any adapter.
- */
-abstract class CTriviallyAdaptedFunctionType<F : Function<*>> : CAdaptedFunctionType<F> {
-    @konan.internal.Intrinsic
-    override final fun fromStatic(function: F): NativePtr =
-            throw Error("CTriviallyAdaptedFunctionType.fromStatic is called virtually")
-}

Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt

@@ -34,21 +34,50 @@ fun <T : CVariable> typeOf(): CVariable.Type = throw Error("typeOf() is called w
 
 @Intrinsic external fun CPointer<*>.getRawValue(): NativePtr
 
-inline fun <reified T : CAdaptedFunctionType<*>> CAdaptedFunctionType.Companion.getInstanceOf(): T =
-        TODO("CAdaptedFunctionType.getInstanceOf 11")
-
 internal fun CPointer<*>.cPointerToString() = "CPointer(raw=$rawValue)"
 
-/**
- * Returns a pointer to `T`-typed C function which calls given Kotlin *static* function.
- * @see CAdaptedFunctionType.fromStatic
- */
-// TODO: This function is not inline, whereas the same name function in JvmTypes.kt 
-// is inline. We can't make it inline here, because native interop lowering 
-// expects to find and transform it. And native interop lowering is done after
-// inline expansions.
-fun <F : Function<*>, T : CAdaptedFunctionType<F>> staticCFunction(body: F): CFunctionPointer<T> {
-    val type = CAdaptedFunctionType.getInstanceOf<T>()
-    return interpretPointed<CFunction<T>>(type.fromStatic(body)).ptr
-}
+@Intrinsic external fun <R> staticCFunction(function: () -> R): CPointer<CFunction<() -> R>>
 
+@Intrinsic external fun <P1, R> staticCFunction(function: (P1) -> R): CPointer<CFunction<(P1) -> R>>
+
+@Intrinsic external fun <P1, P2, R> staticCFunction(function: (P1, P2) -> R): CPointer<CFunction<(P1, P2) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, R> staticCFunction(function: (P1, P2, P3) -> R): CPointer<CFunction<(P1, P2, P3) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, P4, R> staticCFunction(function: (P1, P2, P3, P4) -> R): CPointer<CFunction<(P1, P2, P3, P4) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, R> staticCFunction(function: (P1, P2, P3, P4, P5) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6, P7) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6, P7, P8) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, R> staticCFunction(function: (P1, P2, P3, P4, P5, P6, P7, P8, P9) -> R): CPointer<CFunction<(P1, P2, P3, P4, P5, P6, P7, P8, P9) -> R>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, R> staticCFunction(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>>
+
+@Intrinsic external fun <P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, R> staticCFunction(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>>
+
+@Intrinsic 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(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>>
+
+@Intrinsic 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(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>>

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/jvm/StubGenerator.kt

@@ -152,15 +152,6 @@ class StubGenerator(
 
     val functionsToBind = nativeIndex.functions.filter { it.name !in excludedFunctions }
 
-    private val usedFunctionTypes = mutableMapOf<FunctionType, String>()
-
-    val FunctionType.kotlinName: String
-        get() {
-            return usedFunctionTypes.getOrPut(this, {
-                "CFunctionType" + (usedFunctionTypes.size + 1)
-            })
-        }
-
     private val macroConstantsByName = nativeIndex.macroConstants.associateBy { it.name }
 
     /**
@@ -442,7 +433,7 @@ class StubGenerator(
             }
         }
 
-        is FunctionType -> byRefTypeMirror("CFunction<${type.kotlinName}>")
+        is FunctionType -> byRefTypeMirror("CFunction<${getKotlinFunctionType(type)}>")
 
         is Typedef -> {
             val baseType = mirror(type.def.aliased)
@@ -485,6 +476,17 @@ class StubGenerator(
      * Constructs [OutValueBinding] for the value of given C type.
      */
     fun getOutValueBinding(type: Type): OutValueBinding {
+        if (type.unwrapTypedefs() is RecordType) {
+            // TODO: this case should probably be handled more generally.
+            val typeMirror = mirror(type)
+            return OutValueBinding(
+                    kotlinType = "CValue<${typeMirror.pointedTypeName}>",
+                    kotlinConv = { name -> "$name.getPointer(memScope).rawValue" }, // TODO: eliminate this copying
+                    memScoped = true,
+                    kotlinJniBridgeType = "NativePtr"
+            )
+        }
+
         val mirror = mirror(type)
 
         return OutValueBinding(
@@ -539,16 +541,6 @@ class StubGenerator(
                     kotlinJniBridgeType = "NativePtr"
             )
         }
-        if (type.unwrapTypedefs() is RecordType) {
-            // TODO: this case should probably be handled more generally.
-            val typeMirror = mirror(type)
-            return OutValueBinding(
-                    kotlinType = "CValue<${typeMirror.pointedTypeName}>",
-                    kotlinConv = { name -> "$name.getPointer(memScope).rawValue" }, // TODO: eliminate this copying
-                    memScoped = true,
-                    kotlinJniBridgeType = "NativePtr"
-            )
-        }
 
         return getOutValueBinding(type)
     }
@@ -569,6 +561,15 @@ class StubGenerator(
      * Constructs [InValueBinding] for the value of given C type.
      */
     fun getInValueBinding(type: Type): InValueBinding  {
+        if (type.unwrapTypedefs() is RecordType) {
+            val typeMirror = mirror(type)
+            return InValueBinding(
+                    kotlinJniBridgeType = "NativePtr",
+                    conv = { name -> "interpretPointed<${typeMirror.pointedTypeName}>($name).readValue()" },
+                    kotlinType = "CValue<${typeMirror.pointedTypeName}>"
+            )
+        }
+
         val mirror = mirror(type)
 
         return InValueBinding(
@@ -581,15 +582,6 @@ class StubGenerator(
     fun getCFunctionRetValBinding(func: FunctionDecl): InValueBinding {
         when {
             func.returnsVoid() -> return InValueBinding("Unit")
-            func.returnsRecord() -> {
-                // TODO: this case should probably be handled more generally.
-                val typeMirror = mirror(func.returnType)
-                return InValueBinding(
-                        kotlinJniBridgeType = "NativePtr",
-                        conv = { name -> "interpretPointed<${typeMirror.pointedTypeName}>($name).readValue()" },
-                        kotlinType = "CValue<${typeMirror.pointedTypeName}>"
-                )
-            }
         }
 
         return getInValueBinding(func.returnType)
@@ -606,6 +598,23 @@ class StubGenerator(
                 getCallbackRetValBinding(type.returnType).kotlinType
     }
 
+    private fun getArrayLength(type: ArrayType): Long {
+        val unwrappedElementType = type.elemType.unwrapTypedefs()
+        val elementLength = if (unwrappedElementType is ArrayType) {
+            getArrayLength(unwrappedElementType)
+        } else {
+            1L
+        }
+
+        val elementCount = when (type) {
+            is ConstArrayType -> type.length
+            is IncompleteArrayType -> 0L
+            else -> TODO(type.toString())
+        }
+
+        return elementLength * elementCount
+    }
+
     /**
      * Produces to [out] the definition of Kotlin class representing the reference to given struct.
      */
@@ -616,6 +625,12 @@ class StubGenerator(
             return
         }
 
+        if (platform == KotlinPlatform.JVM) {
+            if (def.hasNaturalLayout) {
+                out("@CNaturalStruct(${def.fields.joinToString { it.name.quoteAsKotlinLiteral() }})")
+            }
+        }
+
         block("class ${decl.kotlinName.asSimpleName()}(override val rawPtr: NativePtr) : CStructVar()") {
             out("")
             out("companion object : Type(${def.size}, ${def.align})") // FIXME: align
@@ -628,9 +643,17 @@ class StubGenerator(
                     assert(field.offset % 8 == 0L)
                     val offset = field.offset / 8
                     val fieldRefType = mirror(field.type)
-                    if (field.type.unwrapTypedefs() is ArrayType) {
+                    val unwrappedFieldType = field.type.unwrapTypedefs()
+                    if (unwrappedFieldType is ArrayType) {
                         val type = (fieldRefType as TypeMirror.ByValue).valueTypeName
 
+                        if (platform == KotlinPlatform.JVM) {
+                            val length = getArrayLength(unwrappedFieldType)
+
+                            // TODO: @CLength should probably be used on types instead of properties.
+                            out("@CLength($length)")
+                        }
+
                         out("val ${field.name.asSimpleName()}: $type")
                         out("    get() = arrayMemberAt($offset)")
                     } else {
@@ -990,51 +1013,6 @@ class StubGenerator(
         return sb.toString()
     }
 
-    private fun getFfiStructType(elementTypes: List<Type>) =
-            "Struct(" +
-                    elementTypes.map { getFfiType(it) }.joinToString(", ") +
-                    ")"
-
-    private fun getFfiType(type: Type): String {
-        return when(type) {
-            is VoidType -> "Void"
-            is CharType -> "SInt8" // TODO: libffi has separate representation for char type.
-            is IntegerType -> when (type.size) {
-                1 -> if (type.isSigned) "SInt8" else "UInt8"
-                2 -> if (type.isSigned) "SInt16" else "UInt16"
-                4 -> if (type.isSigned) "SInt32" else "UInt32"
-                8 -> if (type.isSigned) "SInt64" else "UInt64"
-                else -> TODO(type.toString())
-            }
-            is PointerType -> "Pointer"
-            is ConstArrayType -> getFfiStructType(
-                    Array(type.length.toInt(), { type.elemType }).toList()
-            )
-            is EnumType -> getFfiType(type.def.baseType)
-            is RecordType -> {
-                val def = type.decl.def!!
-                if (!def.hasNaturalLayout) {
-                    throw NotImplementedError(type.kotlinName)
-                }
-                getFfiStructType(def.fields.map { it.type })
-            }
-            is Typedef -> getFfiType(type.def.aliased)
-            else -> throw NotImplementedError(type.toString())
-        }
-    }
-
-    private fun getArgFfiType(type: Type) = when (type.unwrapTypedefs()) {
-        is ArrayType -> "Pointer"
-        else -> getFfiType(type)
-    }
-
-    private fun getRetValFfiType(type: Type) = getArgFfiType(type)
-
-    private fun generateFunctionType(type: FunctionType, name: String) = when (platform) {
-        KotlinPlatform.JVM -> generateJvmFunctionType(type, name)
-        KotlinPlatform.NATIVE -> generateNativeFunctionType(type, name)
-    }
-
     /**
      * Returns `true` iff the function binding for Kotlin Native
      * requires non-trivial Kotlin adapter to convert arguments.
@@ -1064,64 +1042,6 @@ class StubGenerator(
         return true
     }
 
-    private fun FunctionType.requiresAdapterOnNative(): Boolean {
-        assert (platform == KotlinPlatform.NATIVE)
-        return (parameterTypes + returnType).any {
-            val unwrappedType = it.unwrapTypedefs()
-            unwrappedType is RecordType || (unwrappedType is EnumType && unwrappedType.def.isStrictEnum)
-        }
-    }
-
-    private fun generateNativeFunctionType(type: FunctionType, name: String) {
-        if (type.requiresAdapterOnNative()) {
-            out("object $name : CFunctionType {}")
-        } else {
-            val kotlinFunctionType = getKotlinFunctionType(type)
-            out("object $name : CTriviallyAdaptedFunctionType<$kotlinFunctionType>()")
-        }
-    }
-
-    private fun generateJvmFunctionType(type: FunctionType, name: String) {
-        val kotlinFunctionType = getKotlinFunctionType(type)
-
-        val constructorArgs = try {
-            listOf(getRetValFfiType(type.returnType)) +
-                    type.parameterTypes.map { getArgFfiType(it) }
-
-        } catch (e: Throwable) {
-            log("Warning: cannot generate definition for function type $name")
-            out("object $name : CFunctionType {}")
-            return
-        }
-
-        val constructorArgsStr = constructorArgs.joinToString(", ")
-
-        block("object $name : CAdaptedFunctionTypeImpl<$kotlinFunctionType>($constructorArgsStr)") {
-            block("override fun invoke(function: $kotlinFunctionType,  args: CArrayPointer<COpaquePointerVar>, ret: COpaquePointer)") {
-                val args = type.parameterTypes.mapIndexed { i, paramType ->
-                    val pointedTypeName = mirror(paramType).pointedTypeName
-                    val ref = "args[$i]!!.reinterpret<$pointedTypeName>().pointed"
-                    when (paramType.unwrapTypedefs()) {
-                        is RecordType -> ref
-                        else -> "$ref.value"
-                    }
-                }.joinToString(", ")
-
-                out("val res = function($args)")
-
-                when (type.returnType.unwrapTypedefs()) {
-                    is RecordType -> throw NotImplementedError()
-                    is VoidType -> {} // nothing to do
-                    else -> {
-                        val pointedTypeName = mirror(type.returnType).pointedTypeName
-                        out("ret.reinterpret<$pointedTypeName>().pointed.value = res")
-                    }
-                }
-
-            }
-        }
-    }
-
     private fun integerLiteral(type: Type, value: Long): String? {
         if (value == Long.MIN_VALUE) {
             return "${value + 1} - 1" // Workaround for "The value is out of range" compile error.
@@ -1287,12 +1207,6 @@ class StubGenerator(
             }
         }
 
-        usedFunctionTypes.entries.forEach {
-            stubs.add(
-                    generateKotlinFragmentBy { generateFunctionType(it.key, it.value) }
-            )
-        }
-
         return stubs
     }
 

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

@@ -144,20 +144,7 @@ internal class InteropBuiltIns(builtIns: KonanBuiltIns) {
 
     val bitsToDouble = packageScope.getContributedFunctions("bitsToDouble").single()
 
-    val staticCFunction = packageScope.getContributedFunctions("staticCFunction").single()
-
-    private val triviallyAdaptedFunctionTypeClass =
-            packageScope.getContributedClassifier("CTriviallyAdaptedFunctionType") as ClassDescriptor
-
-    private val trivallyAdaptedFunctionTypeType =
-            triviallyAdaptedFunctionTypeClass.defaultType.replace(
-                    newArguments = listOf(
-                            StarProjectionImpl(triviallyAdaptedFunctionTypeClass.declaredTypeParameters.single())
-                    )
-            )
-
-    fun isTriviallyAdaptedFunctionType(type: KotlinType): Boolean =
-            type.isSubtypeOf(trivallyAdaptedFunctionTypeType)
+    val staticCFunction = packageScope.getContributedFunctions("staticCFunction").toSet()
 
     val signExtend = packageScope.getContributedFunctions("signExtend").single()
 

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

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.backend.konan.lower
 
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
+import org.jetbrains.kotlin.backend.common.descriptors.allParameters
 import org.jetbrains.kotlin.backend.common.lower.IrBuildingTransformer
 import org.jetbrains.kotlin.backend.common.lower.at
 import org.jetbrains.kotlin.backend.konan.Context
@@ -275,27 +276,42 @@ private class InteropTransformer(val context: Context, val irFile: IrFile) : IrB
                 builder.readValue(receiver, typeArgument) ?: expression
             }
 
-            interop.staticCFunction -> {
+            in interop.staticCFunction -> {
                 val argument = expression.getValueArgument(0)!!
                 if (argument !is IrCallableReference || argument.getArguments().isNotEmpty()) {
                     context.reportCompilationError(
-                            "${interop.staticCFunction.fqNameSafe} must take an unbound, non-capturing function",
+                            "${descriptor.fqNameSafe} must take an unbound, non-capturing function",
                             irFile, expression
                     )
                     // TODO: should probably be reported during analysis.
                 }
 
-                val cFunctionType = expression.getTypeArgument(descriptor.typeParameters[1])!!
+                val target = argument.descriptor.original
+                val signatureTypes = target.allParameters.map { it.type } + target.returnType!!
 
-                if (interop.isTriviallyAdaptedFunctionType(cFunctionType)) {
-                    IrCallableReferenceImpl(
-                            builder.startOffset, builder.endOffset,
-                            expression.type,
-                            argument.descriptor,
-                            typeArguments = null)
-                } else {
-                    TODO("$cFunctionType requiring non-trivial C adapter")
+                signatureTypes.forEachIndexed { index, type ->
+                    type.ensureSupportedInCallbacks(
+                            isReturnType = (index == signatureTypes.lastIndex),
+                            reportError = { context.reportCompilationError(it, irFile, expression) }
+                    )
                 }
+
+                descriptor.typeParameters.forEachIndexed { index, typeParameterDescriptor ->
+                    val typeArgument = expression.getTypeArgument(typeParameterDescriptor)!!
+                    val signatureType = signatureTypes[index]
+                    if (typeArgument != signatureType) {
+                        context.reportCompilationError(
+                                "C function signature element mismatch: expected '$signatureType', got '$typeArgument'",
+                                irFile, expression
+                        )
+                    }
+                }
+
+                IrCallableReferenceImpl(
+                        builder.startOffset, builder.endOffset,
+                        expression.type,
+                        target,
+                        typeArguments = null)
             }
 
             interop.signExtend, interop.narrow -> {
@@ -346,6 +362,29 @@ private class InteropTransformer(val context: Context, val irFile: IrFile) : IrB
         }
     }
 
+    private fun KotlinType.ensureSupportedInCallbacks(isReturnType: Boolean, reportError: (String) -> Nothing) {
+        if (isReturnType && KotlinBuiltIns.isUnit(this)) {
+            return
+        }
+
+        if (KotlinBuiltIns.isPrimitiveTypeOrNullablePrimitiveType(this)) {
+            if (!this.isMarkedNullable) {
+                return
+            }
+            reportError("Type $this must not be nullable when used in callback signature")
+        }
+
+        if (TypeUtils.getClassDescriptor(this) == interop.cPointer) {
+            if (this.isMarkedNullable) {
+                return
+            }
+
+            reportError("Type $this must be nullable when used in callback signature")
+        }
+
+        reportError("Type $this is not supported in callback signature")
+    }
+
     private fun IrCall.getSingleTypeArgument(): KotlinType {
         val typeParameter = descriptor.original.typeParameters.single()
         return getTypeArgument(typeParameter)!!