v8/test/mjsunit/keyed-load-hole-to-undefined.js
Mythri A f820041aba Reland "[Test] Update tests to work with lazy feedback allocation."
This is a reland of 289b25765a.
The fix for failures landed here:
https://chromium-review.googlesource.com/c/v8/v8/+/1599388

Original change's description:
> [Test] Update tests to work with lazy feedback allocation.
>
> This adds either %EnsureFeedbackVectorForFunction or
> %PrepareFunctionForOptimization to allocate feedback vectors when testing
> optimization, allocation sites, IC transitions etc.,
>
> Bug: v8:8394
> Change-Id: I6ad1b6d460e4abda693b326cddb87754e080a0a1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1593303
> Commit-Queue: Mythri Alle <mythria@chromium.org>
> Auto-Submit: Mythri Alle <mythria@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#61212}

Bug: v8:8394
Change-Id: Idb5bba221d138e6fd73155f959b9e16fc948c709
TBR: rmcilroy@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1599607
Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Auto-Submit: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61332}
2019-05-08 12:51:13 +00:00

27 lines
862 B
JavaScript

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax --no-stress-opt --opt --no-always-opt
// --nostress-opt is specified because the test corrupts the "pristine"
// array prototype chain by storing an element, and this is tracked
// per-isolate. A subsequent stress run would send the load generic,
// and no more deoptimizations of foo would occur.
function foo(a, i) { return a[i]; }
%PrepareFunctionForOptimization(foo);
var a = ['one', , 'three'];
foo(a, 0);
foo(a, 0);
foo(a, 0);
%OptimizeFunctionOnNextCall(foo);
assertEquals(undefined, foo(a, 1));
assertOptimized(foo);
// Whereas if we disrupt the prototype chain...
Array.prototype[1] = 'cow';
assertEquals('cow', foo(a, 1));
assertUnoptimized(foo);