ObjCExport: don't use autorelease when sending arguments to Swift/Obj-C

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objc/ObjCCodeGenerator.kt

@@ -48,14 +48,6 @@ internal open class ObjCCodeGenerator(val codegen: CodeGenerator) {
             origin = context.stdlibModule.llvmSymbolOrigin
     ))
 
-    val objcAutorelease = context.llvm.externalFunction(LlvmFunctionProto(
-            "llvm.objc.autorelease",
-            LlvmRetType(int8TypePtr),
-            listOf(LlvmParamType(int8TypePtr)),
-            listOf(LlvmFunctionAttribute.NoUnwind),
-            origin = context.stdlibModule.llvmSymbolOrigin
-    ))
-
     val objcAutoreleaseReturnValue = context.llvm.externalFunction(LlvmFunctionProto(
             "llvm.objc.autoreleaseReturnValue",
             LlvmRetType(int8TypePtr),

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/BlockPointerSupport.kt

@@ -34,10 +34,6 @@ internal fun ObjCExportCodeGeneratorBase.generateBlockToKotlinFunctionConverter(
             LlvmFunctionSignature(invokeMethod, codegen),
             "invokeFunction${bridge.nameSuffix}"
     ).generate {
-        val args = (0 until bridge.numberOfParameters).map { index ->
-            kotlinReferenceToLocalObjC(param(index + 1))
-        }
-
         val thisRef = param(0)
         val associatedObjectHolder = if (useSeparateHolder) {
             val bodyPtr = bitcast(pointerType(bodyType), thisRef)
@@ -51,10 +47,20 @@ internal fun ObjCExportCodeGeneratorBase.generateBlockToKotlinFunctionConverter(
         )
 
         val invoke = loadBlockInvoke(blockPtr, bridge)
+
+        val args = (0 until bridge.numberOfParameters).map { index ->
+            kotlinReferenceToRetainedObjC(param(index + 1))
+        }
+
         switchThreadStateIfExperimentalMM(ThreadState.Native)
         // Using terminatingExceptionHandler, so any exception thrown by `invoke` will lead to the termination,
         // and switching the thread state back to `Runnable` on exceptional path is not required.
         val result = call(invoke, listOf(blockPtr) + args, exceptionHandler = terminatingExceptionHandler)
+
+        args.forEach {
+            objcReleaseFromNativeThreadState(it)
+        }
+
         switchThreadStateIfExperimentalMM(ThreadState.Runnable)
 
         val kotlinResult = if (bridge.returnsVoid) {

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/ObjCExportCodeGenerator.kt

@@ -87,9 +87,13 @@ internal class ObjCExportFunctionGenerationContext(
 
     fun objcReleaseFromRunnableThreadState(objCReference: LLVMValueRef) {
         switchThreadStateIfExperimentalMM(ThreadState.Native)
+        objcReleaseFromNativeThreadState(objCReference)
+        switchThreadStateIfExperimentalMM(ThreadState.Runnable)
+    }
+
+    fun objcReleaseFromNativeThreadState(objCReference: LLVMValueRef) {
         // It is nounwind, so no exception handler is required.
         call(objCExportCodegen.objcRelease, listOf(objCReference), exceptionHandler = ExceptionHandler.None)
-        switchThreadStateIfExperimentalMM(ThreadState.Runnable)
     }
 
     override fun processReturns() {
@@ -300,29 +304,11 @@ internal class ObjCExportCodeGenerator(
             resultLifetime
     )
 
-    private fun ObjCExportFunctionGenerationContext.kotlinFunctionToObjCBlockPointer(
-            typeBridge: BlockPointerBridge,
-            value: LLVMValueRef
-    ) = callFromBridge(objcAutorelease, listOf(kotlinFunctionToRetainedObjCBlockPointer(typeBridge, value)))
-
     internal fun ObjCExportFunctionGenerationContext.kotlinFunctionToRetainedObjCBlockPointer(
             typeBridge: BlockPointerBridge,
             value: LLVMValueRef
     ) = callFromBridge(kotlinFunctionToRetainedBlockConverter(typeBridge), listOf(value))
 
-    fun ObjCExportFunctionGenerationContext.kotlinToLocalObjC(
-            value: LLVMValueRef,
-            typeBridge: TypeBridge
-    ): LLVMValueRef = if (LLVMTypeOf(value) == voidType) {
-        typeBridge.makeNothing()
-    } else {
-        when (typeBridge) {
-            is ReferenceBridge -> kotlinReferenceToLocalObjC(value)
-            is BlockPointerBridge -> kotlinFunctionToObjCBlockPointer(typeBridge, value) // TODO: use stack-allocated block here.
-            is ValueTypeBridge -> kotlinToObjC(value, typeBridge.objCValueType)
-        }
-    }
-
     fun ObjCExportFunctionGenerationContext.objCToKotlin(
             value: LLVMValueRef,
             typeBridge: TypeBridge,
@@ -1184,6 +1170,8 @@ private fun ObjCExportCodeGenerator.generateKotlinToObjCBridge(
             parameterDescriptor to param(index)
         }.toMap()
 
+        val objCReferenceArgsToRelease = mutableListOf<LLVMValueRef>()
+
         val objCArgs = methodBridge.parametersAssociated(irFunction).map { (bridge, parameter) ->
             when (bridge) {
                 is MethodBridgeValueParameter.Mapped -> {
@@ -1194,10 +1182,26 @@ private fun ObjCExportCodeGenerator.generateKotlinToObjCBridge(
                             expectedType = parameterToBase[parameter]!!.type,
                             resultLifetime = Lifetime.ARGUMENT
                     )
-                    kotlinToLocalObjC(kotlinValue, bridge.bridge)
+                    if (LLVMTypeOf(kotlinValue) == voidType) {
+                        bridge.bridge.makeNothing()
+                    } else {
+                        when (bridge.bridge) {
+                            is ReferenceBridge -> kotlinReferenceToRetainedObjC(kotlinValue).also { objCReferenceArgsToRelease += it }
+                            is BlockPointerBridge -> kotlinFunctionToRetainedObjCBlockPointer(bridge.bridge, kotlinValue) // TODO: use stack-allocated block here.
+                                    .also { objCReferenceArgsToRelease += it }
+                            is ValueTypeBridge -> kotlinToObjC(kotlinValue, bridge.bridge.objCValueType)
+                        }
+                    }
                 }
 
-                MethodBridgeReceiver.Instance -> kotlinReferenceToLocalObjC(parameters[parameter]!!)
+                MethodBridgeReceiver.Instance -> {
+                    // `kotlinReferenceToLocalObjC` can add the result to autoreleasepool in some cases. But not here.
+                    // Because this `parameter` is the receiver of a bridge in an Obj-C/Swift class extending
+                    // Kotlin class or interface.
+                    // So `kotlinReferenceToLocalObjC` here just unwraps the Obj-C reference
+                    // without using autoreleasepool or any other reference counting operations.
+                    kotlinReferenceToLocalObjC(parameters[parameter]!!)
+                }
                 MethodBridgeSelector -> {
                     val selector = baseMethod.selector
                     // Selector is referenced thus should be defined to avoid false positive non-public API rejection:
@@ -1224,13 +1228,14 @@ private fun ObjCExportCodeGenerator.generateKotlinToObjCBridge(
                             Lifetime.ARGUMENT
                     )
 
+                    // TODO: use stack-allocated block here instead.
                     val converter = if (bridge.useUnitCompletion) {
                         unitContinuationToRetainedCompletionConverter
                     } else {
                         continuationToRetainedCompletionConverter
                     }
-                    val retainedCompletion = callFromBridge(converter, listOf(intercepted))
-                    callFromBridge(objcAutorelease, listOf(retainedCompletion)) // TODO: use stack-allocated block here instead.
+                    callFromBridge(converter, listOf(intercepted))
+                            .also { objCReferenceArgsToRelease += it }
                 }
             }
         }
@@ -1239,6 +1244,11 @@ private fun ObjCExportCodeGenerator.generateKotlinToObjCBridge(
         // Using terminatingExceptionHandler, so any exception thrown by the method will lead to the termination,
         // and switching the thread state back to `Runnable` on exceptional path is not required.
         val targetResult = call(objcMsgSend, objCArgs, exceptionHandler = terminatingExceptionHandler)
+
+        objCReferenceArgsToRelease.forEach {
+            objcReleaseFromNativeThreadState(it)
+        }
+
         switchThreadStateIfExperimentalMM(ThreadState.Runnable)
 
         assert(baseMethod.symbol !is IrConstructorSymbol)

kotlin-native/backend.native/tests/objcexport/expectedLazy.h

@@ -1020,11 +1020,18 @@ __attribute__((swift_name("NoAutoreleaseSendHelper")))
 @protocol KtNoAutoreleaseSendHelper
 @required
 - (void)sendKotlinObjectKotlinObject:(KtKotlinObject *)kotlinObject __attribute__((swift_name("sendKotlinObject(kotlinObject:)")));
+- (void (^)(KtKotlinObject *))blockReceivingKotlinObject __attribute__((swift_name("blockReceivingKotlinObject()")));
 - (void)sendSwiftObjectSwiftObject:(id)swiftObject __attribute__((swift_name("sendSwiftObject(swiftObject:)")));
 - (void)sendListList:(NSArray<id> *)list __attribute__((swift_name("sendList(list:)")));
 - (void)sendStringString:(NSString *)string __attribute__((swift_name("sendString(string:)")));
 - (void)sendNumberNumber:(id)number __attribute__((swift_name("sendNumber(number:)")));
 - (void)sendBlockBlock:(KtKotlinObject *(^)(void))block __attribute__((swift_name("sendBlock(block:)")));
+
+/**
+ @note This method converts instances of CancellationException to errors.
+ Other uncaught Kotlin exceptions are fatal.
+*/
+- (void)sendCompletionWithCompletionHandler:(void (^)(id _Nullable_result, NSError * _Nullable))completionHandler __attribute__((swift_name("sendCompletion(completionHandler:)")));
 @end;
 
 __attribute__((swift_name("NoAutoreleaseReceiveHelper")))
@@ -1043,11 +1050,18 @@ __attribute__((swift_name("NoAutoreleaseKotlinSendHelper")))
 @interface KtNoAutoreleaseKotlinSendHelper : KtBase <KtNoAutoreleaseSendHelper>
 - (instancetype)initWithKotlinLivenessTracker:(KtKotlinLivenessTracker *)kotlinLivenessTracker __attribute__((swift_name("init(kotlinLivenessTracker:)"))) __attribute__((objc_designated_initializer));
 - (void)sendKotlinObjectKotlinObject:(KtKotlinObject *)kotlinObject __attribute__((swift_name("sendKotlinObject(kotlinObject:)")));
+- (void (^)(KtKotlinObject *))blockReceivingKotlinObject __attribute__((swift_name("blockReceivingKotlinObject()")));
 - (void)sendSwiftObjectSwiftObject:(id)swiftObject __attribute__((swift_name("sendSwiftObject(swiftObject:)")));
 - (void)sendListList:(NSArray<id> *)list __attribute__((swift_name("sendList(list:)")));
 - (void)sendStringString:(NSString *)string __attribute__((swift_name("sendString(string:)")));
 - (void)sendNumberNumber:(id)number __attribute__((swift_name("sendNumber(number:)")));
 - (void)sendBlockBlock:(KtKotlinObject *(^)(void))block __attribute__((swift_name("sendBlock(block:)")));
+
+/**
+ @note This method converts instances of CancellationException to errors.
+ Other uncaught Kotlin exceptions are fatal.
+*/
+- (void)sendCompletionWithCompletionHandler:(void (^)(id _Nullable_result, NSError * _Nullable))completionHandler __attribute__((swift_name("sendCompletion(completionHandler:)")));
 @property (readonly) KtKotlinLivenessTracker *kotlinLivenessTracker __attribute__((swift_name("kotlinLivenessTracker")));
 @end;
 
@@ -1091,11 +1105,13 @@ __attribute__((swift_name("NoAutoreleaseKt")))
 @interface KtNoAutoreleaseKt : KtBase
 + (void)gc __attribute__((swift_name("gc()")));
 + (void)callSendKotlinObjectHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendKotlinObject(helper:tracker:)")));
++ (void)sendKotlinObjectToBlockHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("sendKotlinObjectToBlock(helper:tracker:)")));
 + (void)callSendSwiftObjectHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker swiftObject:(id)swiftObject __attribute__((swift_name("callSendSwiftObject(helper:tracker:swiftObject:)")));
 + (void)callSendListHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendList(helper:tracker:)")));
 + (void)callSendStringHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendString(helper:tracker:)")));
 + (void)callSendNumberHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendNumber(helper:tracker:)")));
 + (void)callSendBlockHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendBlock(helper:tracker:)")));
++ (void)callSendCompletionHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendCompletion(helper:tracker:)")));
 + (void)callReceiveKotlinObjectHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveKotlinObject(helper:tracker:)")));
 + (void)callReceiveSwiftObjectHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveSwiftObject(helper:tracker:)")));
 + (void)callReceiveListHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveList(helper:tracker:)")));

kotlin-native/backend.native/tests/objcexport/expectedLazyLegacySuspendUnit.h

@@ -962,11 +962,18 @@ __attribute__((swift_name("NoAutoreleaseSendHelper")))
 @protocol KtNoAutoreleaseSendHelper
 @required
 - (void)sendKotlinObjectKotlinObject:(KtKotlinObject *)kotlinObject __attribute__((swift_name("sendKotlinObject(kotlinObject:)")));
+- (void (^)(KtKotlinObject *))blockReceivingKotlinObject __attribute__((swift_name("blockReceivingKotlinObject()")));
 - (void)sendSwiftObjectSwiftObject:(id)swiftObject __attribute__((swift_name("sendSwiftObject(swiftObject:)")));
 - (void)sendListList:(NSArray<id> *)list __attribute__((swift_name("sendList(list:)")));
 - (void)sendStringString:(NSString *)string __attribute__((swift_name("sendString(string:)")));
 - (void)sendNumberNumber:(id)number __attribute__((swift_name("sendNumber(number:)")));
 - (void)sendBlockBlock:(KtKotlinObject *(^)(void))block __attribute__((swift_name("sendBlock(block:)")));
+
+/**
+ @note This method converts instances of CancellationException to errors.
+ Other uncaught Kotlin exceptions are fatal.
+*/
+- (void)sendCompletionWithCompletionHandler:(void (^)(id _Nullable_result, NSError * _Nullable))completionHandler __attribute__((swift_name("sendCompletion(completionHandler:)")));
 @end;
 
 __attribute__((swift_name("NoAutoreleaseReceiveHelper")))
@@ -985,11 +992,18 @@ __attribute__((swift_name("NoAutoreleaseKotlinSendHelper")))
 @interface KtNoAutoreleaseKotlinSendHelper : KtBase <KtNoAutoreleaseSendHelper>
 - (instancetype)initWithKotlinLivenessTracker:(KtKotlinLivenessTracker *)kotlinLivenessTracker __attribute__((swift_name("init(kotlinLivenessTracker:)"))) __attribute__((objc_designated_initializer));
 - (void)sendKotlinObjectKotlinObject:(KtKotlinObject *)kotlinObject __attribute__((swift_name("sendKotlinObject(kotlinObject:)")));
+- (void (^)(KtKotlinObject *))blockReceivingKotlinObject __attribute__((swift_name("blockReceivingKotlinObject()")));
 - (void)sendSwiftObjectSwiftObject:(id)swiftObject __attribute__((swift_name("sendSwiftObject(swiftObject:)")));
 - (void)sendListList:(NSArray<id> *)list __attribute__((swift_name("sendList(list:)")));
 - (void)sendStringString:(NSString *)string __attribute__((swift_name("sendString(string:)")));
 - (void)sendNumberNumber:(id)number __attribute__((swift_name("sendNumber(number:)")));
 - (void)sendBlockBlock:(KtKotlinObject *(^)(void))block __attribute__((swift_name("sendBlock(block:)")));
+
+/**
+ @note This method converts instances of CancellationException to errors.
+ Other uncaught Kotlin exceptions are fatal.
+*/
+- (void)sendCompletionWithCompletionHandler:(void (^)(id _Nullable_result, NSError * _Nullable))completionHandler __attribute__((swift_name("sendCompletion(completionHandler:)")));
 @property (readonly) KtKotlinLivenessTracker *kotlinLivenessTracker __attribute__((swift_name("kotlinLivenessTracker")));
 @end;
 
@@ -1033,11 +1047,13 @@ __attribute__((swift_name("NoAutoreleaseKt")))
 @interface KtNoAutoreleaseKt : KtBase
 + (void)gc __attribute__((swift_name("gc()")));
 + (void)callSendKotlinObjectHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendKotlinObject(helper:tracker:)")));
++ (void)sendKotlinObjectToBlockHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("sendKotlinObjectToBlock(helper:tracker:)")));
 + (void)callSendSwiftObjectHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker swiftObject:(id)swiftObject __attribute__((swift_name("callSendSwiftObject(helper:tracker:swiftObject:)")));
 + (void)callSendListHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendList(helper:tracker:)")));
 + (void)callSendStringHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendString(helper:tracker:)")));
 + (void)callSendNumberHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendNumber(helper:tracker:)")));
 + (void)callSendBlockHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendBlock(helper:tracker:)")));
++ (void)callSendCompletionHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendCompletion(helper:tracker:)")));
 + (void)callReceiveKotlinObjectHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveKotlinObject(helper:tracker:)")));
 + (void)callReceiveSwiftObjectHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveSwiftObject(helper:tracker:)")));
 + (void)callReceiveListHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveList(helper:tracker:)")));

kotlin-native/backend.native/tests/objcexport/expectedLazyNoGenerics.h

@@ -962,11 +962,18 @@ __attribute__((swift_name("NoAutoreleaseSendHelper")))
 @protocol KtNoAutoreleaseSendHelper
 @required
 - (void)sendKotlinObjectKotlinObject:(KtKotlinObject *)kotlinObject __attribute__((swift_name("sendKotlinObject(kotlinObject:)")));
+- (void (^)(KtKotlinObject *))blockReceivingKotlinObject __attribute__((swift_name("blockReceivingKotlinObject()")));
 - (void)sendSwiftObjectSwiftObject:(id)swiftObject __attribute__((swift_name("sendSwiftObject(swiftObject:)")));
 - (void)sendListList:(NSArray<id> *)list __attribute__((swift_name("sendList(list:)")));
 - (void)sendStringString:(NSString *)string __attribute__((swift_name("sendString(string:)")));
 - (void)sendNumberNumber:(id)number __attribute__((swift_name("sendNumber(number:)")));
 - (void)sendBlockBlock:(KtKotlinObject *(^)(void))block __attribute__((swift_name("sendBlock(block:)")));
+
+/**
+ @note This method converts instances of CancellationException to errors.
+ Other uncaught Kotlin exceptions are fatal.
+*/
+- (void)sendCompletionWithCompletionHandler:(void (^)(id _Nullable_result, NSError * _Nullable))completionHandler __attribute__((swift_name("sendCompletion(completionHandler:)")));
 @end;
 
 __attribute__((swift_name("NoAutoreleaseReceiveHelper")))
@@ -985,11 +992,18 @@ __attribute__((swift_name("NoAutoreleaseKotlinSendHelper")))
 @interface KtNoAutoreleaseKotlinSendHelper : KtBase <KtNoAutoreleaseSendHelper>
 - (instancetype)initWithKotlinLivenessTracker:(KtKotlinLivenessTracker *)kotlinLivenessTracker __attribute__((swift_name("init(kotlinLivenessTracker:)"))) __attribute__((objc_designated_initializer));
 - (void)sendKotlinObjectKotlinObject:(KtKotlinObject *)kotlinObject __attribute__((swift_name("sendKotlinObject(kotlinObject:)")));
+- (void (^)(KtKotlinObject *))blockReceivingKotlinObject __attribute__((swift_name("blockReceivingKotlinObject()")));
 - (void)sendSwiftObjectSwiftObject:(id)swiftObject __attribute__((swift_name("sendSwiftObject(swiftObject:)")));
 - (void)sendListList:(NSArray<id> *)list __attribute__((swift_name("sendList(list:)")));
 - (void)sendStringString:(NSString *)string __attribute__((swift_name("sendString(string:)")));
 - (void)sendNumberNumber:(id)number __attribute__((swift_name("sendNumber(number:)")));
 - (void)sendBlockBlock:(KtKotlinObject *(^)(void))block __attribute__((swift_name("sendBlock(block:)")));
+
+/**
+ @note This method converts instances of CancellationException to errors.
+ Other uncaught Kotlin exceptions are fatal.
+*/
+- (void)sendCompletionWithCompletionHandler:(void (^)(id _Nullable_result, NSError * _Nullable))completionHandler __attribute__((swift_name("sendCompletion(completionHandler:)")));
 @property (readonly) KtKotlinLivenessTracker *kotlinLivenessTracker __attribute__((swift_name("kotlinLivenessTracker")));
 @end;
 
@@ -1033,11 +1047,13 @@ __attribute__((swift_name("NoAutoreleaseKt")))
 @interface KtNoAutoreleaseKt : KtBase
 + (void)gc __attribute__((swift_name("gc()")));
 + (void)callSendKotlinObjectHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendKotlinObject(helper:tracker:)")));
++ (void)sendKotlinObjectToBlockHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("sendKotlinObjectToBlock(helper:tracker:)")));
 + (void)callSendSwiftObjectHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker swiftObject:(id)swiftObject __attribute__((swift_name("callSendSwiftObject(helper:tracker:swiftObject:)")));
 + (void)callSendListHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendList(helper:tracker:)")));
 + (void)callSendStringHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendString(helper:tracker:)")));
 + (void)callSendNumberHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendNumber(helper:tracker:)")));
 + (void)callSendBlockHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendBlock(helper:tracker:)")));
++ (void)callSendCompletionHelper:(id<KtNoAutoreleaseSendHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callSendCompletion(helper:tracker:)")));
 + (void)callReceiveKotlinObjectHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveKotlinObject(helper:tracker:)")));
 + (void)callReceiveSwiftObjectHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveSwiftObject(helper:tracker:)")));
 + (void)callReceiveListHelper:(id<KtNoAutoreleaseReceiveHelper>)helper tracker:(KtKotlinLivenessTracker *)tracker __attribute__((swift_name("callReceiveList(helper:tracker:)")));

kotlin-native/backend.native/tests/objcexport/noAutorelease.kt

@@ -1,5 +1,7 @@
 package noAutorelease
 
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
 import kotlin.native.internal.NativePtr
 import kotlin.native.ref.WeakReference
 import kotlin.test.*
@@ -23,11 +25,13 @@ class KotlinObject
 
 interface NoAutoreleaseSendHelper {
     fun sendKotlinObject(kotlinObject: KotlinObject)
+    fun blockReceivingKotlinObject(): (KotlinObject) -> Unit
     fun sendSwiftObject(swiftObject: Any)
     fun sendList(list: List<*>)
     fun sendString(string: String)
     fun sendNumber(number: Any)
     fun sendBlock(block: () -> KotlinObject)
+    suspend fun sendCompletion(): Any?
 }
 
 interface NoAutoreleaseReceiveHelper {
@@ -41,11 +45,16 @@ interface NoAutoreleaseReceiveHelper {
 
 class NoAutoreleaseKotlinSendHelper(val kotlinLivenessTracker: KotlinLivenessTracker) : NoAutoreleaseSendHelper {
     override fun sendKotlinObject(kotlinObject: KotlinObject) = kotlinLivenessTracker.add(kotlinObject)
+    override fun blockReceivingKotlinObject(): (KotlinObject) -> Unit = { kotlinLivenessTracker.add(it) }
     override fun sendSwiftObject(swiftObject: Any) = kotlinLivenessTracker.add(swiftObject)
     override fun sendList(list: List<*>) = kotlinLivenessTracker.add(list)
     override fun sendString(string: String) = kotlinLivenessTracker.add(string)
     override fun sendNumber(number: Any) = kotlinLivenessTracker.add(number)
     override fun sendBlock(block: () -> KotlinObject) = kotlinLivenessTracker.add(block)
+    override suspend fun sendCompletion() = suspendCoroutineUninterceptedOrReturn<Any?> { continuation ->
+        kotlinLivenessTracker.add(continuation)
+        null
+    }
 }
 
 class NoAutoreleaseKotlinReceiveHelper(val kotlinLivenessTracker: KotlinLivenessTracker) : NoAutoreleaseReceiveHelper {
@@ -82,6 +91,14 @@ fun callSendKotlinObject(helper: NoAutoreleaseSendHelper, tracker: KotlinLivenes
     tracker.add(kotlinObject)
 }
 
+fun sendKotlinObjectToBlock(helper: NoAutoreleaseSendHelper, tracker: KotlinLivenessTracker) {
+    val kotlinObject = KotlinObject()
+
+    helper.blockReceivingKotlinObject()(kotlinObject)
+    helper.blockReceivingKotlinObject()(kotlinObject)
+    tracker.add(kotlinObject)
+}
+
 fun callSendSwiftObject(helper: NoAutoreleaseSendHelper, tracker: KotlinLivenessTracker, swiftObject: Any) {
     helper.sendSwiftObject(swiftObject)
     helper.sendSwiftObject(swiftObject)
@@ -120,6 +137,22 @@ fun callSendBlock(helper: NoAutoreleaseSendHelper, tracker: KotlinLivenessTracke
     tracker.add(block)
 }
 
+private class EmptyContinuation : Continuation<Any?> {
+    override val context: CoroutineContext = EmptyCoroutineContext
+    override fun resumeWith(result: Result<Any?>) { result.getOrThrow() }
+}
+
+fun callSendCompletion(helper: NoAutoreleaseSendHelper, tracker: KotlinLivenessTracker) {
+    val completion = EmptyContinuation()
+
+    suspend {
+        helper.sendCompletion()
+        helper.sendCompletion()
+    }.startCoroutine(completion)
+
+    tracker.add(completion)
+}
+
 fun callReceiveKotlinObject(helper: NoAutoreleaseReceiveHelper, tracker: KotlinLivenessTracker) = repeat(2) {
     tracker.add(helper.receiveKotlinObject())
 }

kotlin-native/backend.native/tests/objcexport/noAutorelease.swift

@@ -40,6 +40,12 @@ private class NoAutoreleaseSwiftHelper : NoAutoreleaseSendHelper, NoAutoreleaseR
         swiftLivenessTracker.add(kotlinObject)
     }
 
+    func blockReceivingKotlinObject() -> (KotlinObject) -> Void {
+        return {
+            self.swiftLivenessTracker.add($0)
+        }
+    }
+
     func sendSwiftObject(swiftObject: Any) {
         swiftLivenessTracker.add(swiftObject as AnyObject)
     }
@@ -57,6 +63,10 @@ private class NoAutoreleaseSwiftHelper : NoAutoreleaseSendHelper, NoAutoreleaseR
     func sendBlock(block: @escaping () -> KotlinObject) {
     }
 
+    func sendCompletion(completionHandler: @escaping (Any?, Error?) -> Void) {
+        completionHandler(nil, nil)
+    }
+
     let kotlinObject = KotlinObject()
     let swiftObject = SwiftObject2()
     let list = createList()
@@ -220,6 +230,12 @@ private func testSendKotlinObjectToKotlin() throws {
     }
 }
 
+private func testSendKotlinObjectToKotlinBlock() throws {
+    try testSendToKotlin({ KotlinObject() }) {
+        $0.blockReceivingKotlinObject()($1)
+    }
+}
+
 private func testSendSwiftObjectToKotlin() throws {
     try testSendToKotlin({ SwiftObject1() }) {
         $0.sendSwiftObject(swiftObject: $1)
@@ -250,6 +266,12 @@ private func testSendBlockToKotlin() throws {
     }
 }
 
+private func testSendCompletionToKotlin() throws {
+    try testSendToKotlin({ createCompletion() }, flags: TestFlags(trackSwiftLifetime: false)) {
+        $0.sendCompletion(completionHandler: $1)
+    }
+}
+
 private func testReceiveKotlinObjectFromKotlin() throws {
     try testReceiveFromKotlin {
         $0.receiveKotlinObject()
@@ -328,6 +350,15 @@ private func testSendKotlinObjectToSwift() throws {
     }
 }
 
+private func testSendKotlinObjectToSwiftBlock() throws {
+    // Getting Swift block in Kotlin still adds it to the autoreleasepool.
+    // The block is not our target, so just use `checkAutorelease: false` flag
+    // to disable the relevant check for now.
+    try testCallToSwift(flags: TestFlags(checkAutorelease: false)) {
+        NoAutoreleaseKt.sendKotlinObjectToBlock(helper: $0, tracker: $1)
+    }
+}
+
 private func testSendSwiftObjectToSwift() throws {
     try testCallToSwift {
         NoAutoreleaseKt.callSendSwiftObject(helper: $0, tracker: $1, swiftObject: SwiftObject4())
@@ -361,6 +392,12 @@ private func testSendBlockToSwift() throws {
     }
 }
 
+private func testSendCompletionToSwift() throws {
+    try testCallToSwift(flags: TestFlags(trackSwiftLifetime: false)) {
+        NoAutoreleaseKt.callSendCompletion(helper: $0, tracker: $1)
+    }
+}
+
 private func testReceiveKotlinObjectFromSwift() throws {
     try testCallToSwift(flags: TestFlags(runGCTwice: true)) {
         NoAutoreleaseKt.callReceiveKotlinObject(helper: $0, tracker: $1)
@@ -421,6 +458,10 @@ private func createBlock(swiftLivenessTracker: SwiftLivenessTracker) -> () -> Ko
     }
 }
 
+private func createCompletion() -> (Any?, Error?) -> Void {
+    return { _, _ in }
+}
+
 private func createString() -> String {
     return NSObject().description // Make it dynamic.
 }
@@ -434,11 +475,13 @@ class NoAutoreleaseTests : SimpleTestProvider {
         super.init()
 
         test("testSendKotlinObjectToKotlin", testSendKotlinObjectToKotlin)
+        test("testSendKotlinObjectToKotlinBlock", testSendKotlinObjectToKotlinBlock)
         test("testSendSwiftObjectToKotlin", testSendSwiftObjectToKotlin)
         test("testSendListToKotlin", testSendListToKotlin)
         test("testSendStringToKotlin", testSendStringToKotlin)
         test("testSendNumberToKotlin", testSendNumberToKotlin)
         test("testSendBlockToKotlin", testSendBlockToKotlin)
+        test("testSendCompletionToKotlin", testSendCompletionToKotlin)
 
         test("testReceiveKotlinObjectFromKotlin", testReceiveKotlinObjectFromKotlin)
         test("testReceiveSwiftObjectFromKotlin", testReceiveSwiftObjectFromKotlin)
@@ -454,18 +497,16 @@ class NoAutoreleaseTests : SimpleTestProvider {
         test("testGetKotlinSingleton", testGetKotlinSingleton)
         test("testGetKotlinEnumEntry", testGetKotlinEnumEntry)
 
-#if false
         test("testSendKotlinObjectToSwift", testSendKotlinObjectToSwift)
-#endif
-
+        test("testSendKotlinObjectToSwiftBlock", testSendKotlinObjectToSwiftBlock)
         test("testSendSwiftObjectToSwift", testSendSwiftObjectToSwift)
-
-#if false
         test("testSendListToSwift", testSendListToSwift)
         test("testSendStringToSwift", testSendStringToSwift)
         test("testSendNumberToSwift", testSendNumberToSwift)
         test("testSendBlockToSwift", testSendBlockToSwift)
+        test("testSendCompletionToSwift", testSendCompletionToSwift)
 
+#if false
         test("testReceiveKotlinObjectFromSwift", testReceiveKotlinObjectFromSwift)
         test("testReceiveSwiftObjectFromSwift", testReceiveSwiftObjectFromSwift)
         test("testReceiveListFromSwift", testReceiveListFromSwift)