tests/ffi/callback_tests_utils.dart

// 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.

import 'dart:ffi';

import 'dylib_utils.dart';

import "package:expect/expect.dart";

final ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");

typedef NativeCallbackTest = Int32 Function(Pointer);
typedef NativeCallbackTestFn = int Function(Pointer);

class CallbackTest {
  final String name;
  final void Function() afterCallbackChecks;
  final bool isLeaf;

  // Either a NativeCallable or a Pointer.fromFunction.
  final Object callback;

  CallbackTest(this.name, this.callback, {this.isLeaf = false})
      : afterCallbackChecks = noChecks {}
  CallbackTest.withCheck(this.name, this.callback, this.afterCallbackChecks,
      {this.isLeaf = false}) {}

  void run() {
    final NativeCallbackTestFn tester = isLeaf
        ? ffiTestFunctions.lookupFunction<NativeCallbackTest,
            NativeCallbackTestFn>("Test$name", isLeaf: true)
        : ffiTestFunctions.lookupFunction<NativeCallbackTest,
            NativeCallbackTestFn>("Test$name", isLeaf: false);

    final cb = callback;
    final int testCode =
        tester(cb is NativeCallable ? cb.nativeFunction : cb as Pointer);

    if (testCode != 0) {
      Expect.fail("Test $name failed.");
    }

    afterCallbackChecks();
    if (cb is NativeCallable) {
      cb.close();
    }
  }
}

void noChecks() {}