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c959c9aba7
Change-Id: I3f67dd79ff2ee745cc2ea161ce7150630e805c97 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150186 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com>
61 lines
1.5 KiB
Dart
61 lines
1.5 KiB
Dart
// Copyright (c) 2011, 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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// VMOptions=--optimization-counter-threshold=10
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import "package:expect/expect.dart";
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// This is a test for deoptimization infrastructure and to reproduce the
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// failure from bug 5442338.
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main() {
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warmup();
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runTest();
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}
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// Create a situation where method 'call' is optimized for using class A
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// when calling foo.
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warmup() {
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List a = [new A(), new A(), new A(), new A()];
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var res = 0;
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for (int i = 0; i < 20; i++) {
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res = call(a, 0);
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}
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Expect.equals(10, res);
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}
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// Create a situation where several optimized frames of 'call' are on stack
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// when deoptimization occurs because B.foo is called. After the first
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// deoptimization, several optimized frames of 'call' are still on stack and
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// some of them will be deoptimized.
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runTest() {
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List a = [new A(), new A(), new B(), new A(), new B(), new B()];
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var res = call(a, 0);
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Expect.equals(35, res);
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}
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// This method will be optimized for using class A when calling 'foo' and
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// later will be deoptimized because B.foo is required.
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call(List a, int n) {
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if (n < a.length) {
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var sum = call(a, n + 1);
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for (int i = n; i < a.length; i++) {
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sum += a[i].foo();
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}
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return sum;
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}
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return 0;
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}
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class A {
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foo() {
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return 1;
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}
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}
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class B {
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foo() {
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return 2;
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}
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}
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