v8/test/mjsunit/compiler/test-literal-map-migration.js
Mike Stanton d75813657d [compiler] Don't migrate boilerplates during TurboFan compile.
Instead, bail out of inline literal creation if a deprecated map is
found. This makes it easier to compile on the background thread.

Bug: v8:7790
Change-Id: I87941938d4f13dcf49230cf246c33bf2f49897f5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2745134
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73988}
2021-04-16 09:00:44 +00:00

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JavaScript

// Copyright 2021 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 --opt --no-always-opt
function f() {
let r = [];
let o1 = { x: 5 };
let o2 = { y: 5, inner: { n: 5 } };
r.push(o1);
r.push(o2);
return r;
}
%PrepareFunctionForOptimization(f);
{
let r = f();
f();
// Deprecate all the maps.
r[0].x = 5.5;
r[1].y = 5.5;
r[1].inner.n = 5.5;
}
// We will optimize despite deprecated maps in the boilerplates.
// until code finalization.
%OptimizeFunctionOnNextCall(f);
f();
assertOptimized(f);