blob: 4236ee9a2ff69dae2209792928f42eac4ff72c02 [file] [log] [blame]
// 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);
Expect.equals(null, c?.m(bomb()));
Expect.equals(null, getNull()?.anything(bomb()));
Expect.equals(1, d?.m(1));
Expect.equals(1, new C(1)?.f);
Expect.equals(null, c?.v);
Expect.equals(10, c ?? 10);
Expect.equals(d, d ?? bomb());
Expect.equals(
3,
[
[3]
]?.expand((i) => i).toList()[0]);
Expect.equals(null, (null as List<List<int>>)?.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 x = 5 ?? 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);
}