| // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| // VMOptions=--optimization-counter-threshold=10 |
| |
| import "package:expect/expect.dart"; |
| |
| // This is a test for deoptimization infrastructure and to reproduce the |
| // failure from bug 5442338. |
| |
| main() { |
| warmup(); |
| runTest(); |
| } |
| |
| // Create a situation where method 'call' is optimized for using class A |
| // when calling foo. |
| warmup() { |
| List a = [new A(), new A(), new A(), new A()]; |
| var res = 0; |
| for (int i = 0; i < 20; i++) { |
| res = call(a, 0); |
| } |
| Expect.equals(10, res); |
| } |
| |
| // Create a situation where several optimized frames of 'call' are on stack |
| // when deoptimization occurs because B.foo is called. After the first |
| // deoptimization, several optimized frames of 'call' are still on stack and |
| // some of them will be deoptimized. |
| runTest() { |
| List a = [new A(), new A(), new B(), new A(), new B(), new B()]; |
| var res = call(a, 0); |
| Expect.equals(35, res); |
| } |
| |
| // This method will be optimized for using class A when calling 'foo' and |
| // later will be deoptimized because B.foo is required. |
| call(List a, int n) { |
| if (n < a.length) { |
| var sum = call(a, n + 1); |
| for (int i = n; i < a.length; i++) { |
| sum += a[i].foo(); |
| } |
| return sum; |
| } |
| return 0; |
| } |
| |
| class A { |
| foo() { |
| return 1; |
| } |
| } |
| |
| class B { |
| foo() { |
| return 2; |
| } |
| } |