Vyacheslav Egorov
c5f933fdf7
On 64-bit platforms we use a field in the header to cache results of Object.get:_identityHashCode. The very same field is also used to cache String.get:hashCode result. Which means that their implementations must be the same. Fixes https://github.com/flutter/flutter/issues/20122 Change-Id: I98eef9eddf833c0d7c4c6f452728fe48e232efdc Reviewed-on: https://dart-review.googlesource.com/68042 Commit-Queue: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
25 lines
932 B
Dart
25 lines
932 B
Dart
// Copyright (c) 2018, 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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// Regression test for https://github.com/flutter/flutter/issues/20122
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// Verifies that identityHashCode for strings does not interfere
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// with normal hashCode.
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import 'package:expect/expect.dart';
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var prefix = 'x';
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make(v) => '${prefix}${v}'; // to inhibit constant folding.
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void main() {
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final x = make('test');
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final y = make('test');
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// On 64-bit platforms there is a field in the header that is used to cache
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// hash value for both Object.get:hashCode and identityHashCode(...).
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// Which means that implementation of these two methods should match
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// otherwise you will get different hash codes for otherwise identical objects.
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identityHashCode(y);
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Expect.equals(x.hashCode, y.hashCode);
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}
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