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ffi_test_helpers.dart
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ffi_test_helpers.dart
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// 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.
// @dart = 2.9
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 triggerGc = ffiTestFunctions
.lookupFunction<NativeNullaryOp, NullaryOpVoid>("TriggerGC");
final collectOnNthAllocation = ffiTestFunctions
.lookupFunction<NativeUnaryOp, UnaryOpVoid>("CollectOnNthAllocation");
extension PointerOffsetBy<T extends NativeType> on Pointer<T> {
Pointer<T> offsetBy(int bytes) => Pointer.fromAddress(address + bytes);
}