Joshua Litt
eab26cd2bd
Change-Id: Ia1f913a01f2be006158967b145db3ee34b297cfe Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155660 Commit-Queue: Joshua Litt <joshualitt@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
85 lines
3.1 KiB
Dart
85 lines
3.1 KiB
Dart
// Copyright (c) 2020, 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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// 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:checks=[],instance,typeArgument*/
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class Instantiated {} // instantiated and used in many ways
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/*class: Deferred:checks=[],instance*/
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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:checks=[],onlyForConstructor*/
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class Removed {} // allocated but optimized out of program
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/*class: DeferredAndRemoved:checks=[],onlyForConstructor*/
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class DeferredAndRemoved {} // allocated after first check and removed
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/*class: UsedAsTypeParameter:typeArgument*/
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class UsedAsTypeParameter {} // only used as a type parameter
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/*class: UsedAsTestedTypeParameter:typeArgument*/
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class UsedAsTestedTypeParameter {} // only used as a type parameter
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/*class: Check:checks=[],instance*/
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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 UsedAsTypeParameter;
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}
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void main() {
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var things = List(3);
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things.setRange(0, 3, [Instantiated(), 1, Object()]);
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var checkX = Check<Instantiated>();
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var checkU1 = Check<UsedAsTestedTypeParameter>();
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var checkU2 = Check<UsedAsTypeParameter>();
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// ignore: UNUSED_LOCAL_VARIABLE
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var removed = Removed(); // This is optimized out.
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// Tests that can be compiled to instanceof:
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if (things[0] is Instantiated) print('expected');
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if (things[1] is Instantiated) print('unexpected');
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if (things[1] is Removed) print('unexpected');
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if (things[1] is DeferredAndRemoved) print('unexpected');
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if (things[1] is Deferred) print('unexpected');
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// Tests that might be optimized to false since there are no allocations:
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if (things[1] is Unused) print('unexpected');
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if (things[1] is UsedAsTypeParameter) print('unexpected');
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if (checkX.check(things[0])) print('expected');
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if (checkX.check(things[1])) print('unexpected');
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if (checkU1.check(things[1])) print('unexpected');
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if (checkU2.check(things[1])) print('unexpected');
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// ignore: UNUSED_LOCAL_VARIABLE
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var removed2 = DeferredAndRemoved(); // 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, [Instantiated(), 1, Deferred()]);
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// Tests that can be compiled to instanceof:
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if (things[0] is Instantiated) print('expected');
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if (things[1] is Instantiated) print('unexpected');
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if (things[1] is Removed) print('unexpected');
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if (things[1] is DeferredAndRemoved) print('unexpected');
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if (things[1] is Deferred) print('unexpected');
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if (things[2] is Deferred) print('expected');
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// Tests that might be optimized to false since there are no allocations:
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if (things[1] is Unused) print('unexpected');
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if (things[1] is UsedAsTypeParameter) print('unexpected');
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}
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