Robert Nystrom
2034061433
Change-Id: I313a57ed7c7ea2ada75065f55a7367376f6bdae5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152183 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Srujan Gaddam <srujzs@google.com>
33 lines
1007 B
Dart
33 lines
1007 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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// Verify that optimizing compiler does not perform an illegal code motion
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// past CheckNull instruction.
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import "package:expect/expect.dart";
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class C {
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final String padding = "";
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final String field = "1"; // Note: need padding to hit an object header
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// of the next object after [null] object when
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// doing illegal null.field read. Need to hit
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// object header to cause crash.
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}
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int foofoo(C? p) {
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int sum = 0;
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for (var i = 0; i < 10; i++) {
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// Note: need redundant instructions in the loop to trigger Canonicalize
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// after CSE. Canonicalize then would illegally remove the Redefinition.
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sum += p!.field.length;
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sum += p.field.length;
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}
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return sum;
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}
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void main() {
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Expect.equals(20, foofoo(new C()));
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Expect.throwsTypeError(() => foofoo(null));
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}
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