| // Copyright (c) 2015, 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. |
| // |
| // VMOptions=--optimization_counter_threshold=5 |
| // |
| // Basic null-aware operator test that invokes the optimizing compiler. |
| |
| import "package:expect/expect.dart"; |
| |
| class C { |
| C(this.f); |
| var f; |
| m(a) => a; |
| } |
| |
| bomb() { |
| Expect.fail('Should not be executed'); |
| return 100; |
| } |
| |
| getNull() => null; |
| |
| test() { |
| var c; |
| var d = new C(5) as C?; |
| Expect.equals(null, c?.m(bomb())); |
| Expect.equals(null, getNull()?.anything(bomb())); |
| Expect.equals(1, d?.m(1)); |
| |
| var c2 = new C(1) as C?; |
| Expect.equals(1, c2?.f); |
| Expect.equals(null, c?.v); |
| Expect.equals(10, c ?? 10); |
| Expect.equals(d, d ?? bomb()); |
| var list = [[3]] as List<List<int>>?; |
| Expect.equals( |
| 3, |
| list?.expand((i) => i).toList()[0]); |
| Expect.equals(null, (null as dynamic)?.expand((i) => i)?.toList()); |
| |
| var e; |
| // The assignment to e is not executed since d != null. |
| d ??= e ??= new C(100); |
| Expect.equals(null, e); |
| e ??= new C(100); |
| Expect.equals(100, e?.f); |
| e?.f ??= 200; |
| Expect.equals(100, e?.f); |
| |
| e.f = null; |
| e?.f ??= 200; |
| Expect.equals(200, e?.f); |
| |
| c?.f ??= 400; |
| Expect.equals(null, c?.f); |
| Expect.equals(null, c?.f++); |
| e?.f++; |
| Expect.equals(201, e.f); |
| |
| var five = 5 as int?; |
| var x = five ?? bomb(); |
| } |
| |
| // Check that instructions without result do not crash. |
| test2() { |
| var c; |
| c?.v; |
| c?.m(bomb()); |
| } |
| |
| class Bar { |
| String? s; |
| } |
| |
| class Foo { |
| Bar? _bar; |
| String? str; |
| |
| Foo(this._bar) : str = _bar?.s; |
| } |
| |
| // Check that ?? isn't incorrectly optimized as non-nullable |
| // (DDC regression test) |
| test3() { |
| List? n = null; |
| var func = n?.add; |
| var result = func ?? 1; |
| Expect.equals(result, 1); |
| |
| String? x = null; |
| Expect.equals(x?.split(',') ?? 'hello', 'hello'); |
| } |
| |
| main() { |
| for (int i = 0; i < 10; i++) { |
| test(); |
| test2(); |
| test3(); |
| } |
| |
| Expect.equals(null, new Foo(new Bar()).str); |
| } |