| // Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| // |
| // Helpers for tests which trigger GC in delicate places. |
| |
| // ignore: import_internal_library, unused_import |
| import 'dart:_internal'; |
| import 'dart:ffi'; |
| |
| import 'dylib_utils.dart'; |
| |
| typedef NativeNullaryOp = Void Function(); |
| typedef NullaryOpVoid = void Function(); |
| |
| typedef NativeUnaryOp = Void Function(IntPtr); |
| typedef UnaryOpVoid = void Function(int); |
| |
| final DynamicLibrary ffiTestFunctions = |
| dlopenPlatformSpecific("ffi_test_functions"); |
| |
| final collectOnNthAllocation = ffiTestFunctions |
| .lookupFunction<NativeUnaryOp, UnaryOpVoid>("CollectOnNthAllocation"); |
| |
| extension PointerOffsetBy<T extends NativeType> on Pointer<T> { |
| Pointer<T> offsetBy(int bytes) => Pointer.fromAddress(address + bytes); |
| } |
| |
| /// Triggers garbage collection. |
| // Defined in `dart:_internal`. |
| // ignore: undefined_identifier |
| void triggerGc() => VMInternalsForTesting.collectAllGarbage(); |
| |
| void Function(String) _namedPrint(String? name) { |
| if (name != null) { |
| return (String value) => print('$name: $value'); |
| } |
| return (String value) => print(value); |
| } |
| |
| /// Does a GC and if [doAwait] awaits a future to enable running finalizers. |
| /// |
| /// Also prints for debug purposes. |
| /// |
| /// If provided, [name] prefixes the debug prints. |
| void doGC({String? name}) { |
| final _print = _namedPrint(name); |
| |
| _print('Do GC.'); |
| triggerGc(); |
| _print('GC done'); |
| } |
| |
| void createAndLoseFinalizable(Pointer<IntPtr> token) { |
| final myFinalizable = MyFinalizable(); |
| setTokenFinalizer.attach(myFinalizable, token.cast()); |
| } |
| |
| final setTokenTo42Ptr = |
| ffiTestFunctions.lookup<NativeFinalizerFunction>("SetArgumentTo42"); |
| final setTokenFinalizer = NativeFinalizer(setTokenTo42Ptr); |
| |
| class MyFinalizable implements Finalizable {} |