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TEST=ci Bug: Contributes to https://github.com/dart-lang/sdk/issues/49529 Change-Id: Ic129ef2d89f625d9ec6a7a1c301cffddd60b2ff7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/258920 Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Michael Thomsen <mit@google.com> Reviewed-by: Slava Egorov <vegorov@google.com>
78 lines
2.6 KiB
Dart
78 lines
2.6 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.7
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import "package:expect/expect.dart";
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// It is sometimes possible to compile is-checks to 'instanceof', when the class
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// is not in an 'implements' clause or used as a mixin.
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// This test verifies is-checks work with simple classes that have various
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// degrees of instantiation.
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class INSTANTIATED {} // instantiated and used in many ways
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class DEFERRED {} // instantiated after first check
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class UNUSED {} // used only in is-check
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class REMOVED {} // allocated but optimized out of program
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class DEFERRED_AND_REMOVED {} // allocated after first check and removed
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class USED_AS_TYPE_PARAMETER {} // only used as a type parameter
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class USED_AS_TESTED_TYPE_PARAMETER {} // only used as a type parameter
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class Check<T> {
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bool check(x) => x is T;
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}
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class Check2<T> {
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bool check(x) => x is USED_AS_TYPE_PARAMETER;
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}
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void main() {
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var things = new List<dynamic>.filled(3, null);
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things.setRange(0, 3, [new INSTANTIATED(), 1, new Object()]);
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var checkX = new Check<INSTANTIATED>();
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var checkU1 = new Check<USED_AS_TESTED_TYPE_PARAMETER>();
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var checkU2 = new Check<USED_AS_TYPE_PARAMETER>();
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var removed = new REMOVED(); // This is optimized out.
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// Tests that can be compiled to instanceof:
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Expect.isTrue(things[0] is INSTANTIATED);
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Expect.isFalse(things[1] is INSTANTIATED);
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Expect.isFalse(things[1] is REMOVED);
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Expect.isFalse(things[1] is DEFERRED_AND_REMOVED);
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Expect.isFalse(things[1] is DEFERRED);
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// Tests that might be optimized to false since there are no allocations:
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Expect.isFalse(things[1] is UNUSED);
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Expect.isFalse(things[1] is USED_AS_TYPE_PARAMETER);
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Expect.isTrue(checkX.check(things[0]));
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Expect.isFalse(checkX.check(things[1]));
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Expect.isFalse(checkU1.check(things[1]));
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Expect.isFalse(checkU2.check(things[1]));
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var removed2 = new DEFERRED_AND_REMOVED(); // This is optimized out.
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// First allocation of DEFERRED is after the above tests.
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things.setRange(0, 3, [new INSTANTIATED(), 1, new DEFERRED()]);
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// Tests that can be compiled to instanceof:
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Expect.isTrue(things[0] is INSTANTIATED);
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Expect.isFalse(things[1] is INSTANTIATED);
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Expect.isFalse(things[1] is REMOVED);
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Expect.isFalse(things[1] is DEFERRED_AND_REMOVED);
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Expect.isFalse(things[1] is DEFERRED);
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Expect.isTrue(things[2] is DEFERRED);
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// Tests that might be optimized to false since there are no allocations:
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Expect.isFalse(things[1] is UNUSED);
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Expect.isFalse(things[1] is USED_AS_TYPE_PARAMETER);
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}
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