15c9ff0758
which was enabled a long ago and is not supposed to be disabled. In addition this CL adds Representation::MightCauseMapDeprecation() predicate and ensures it's consistent with the existing MostGenericInPlaceChange() and CanBeInPlaceChangedTo(). Bug: v8:11104, v8:8865 Change-Id: Ia8046b76822c9b20fe3ce85de6b98570334aad21 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2527088 Commit-Queue: Igor Sheludko <ishell@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/master@{#71151}
32 lines
794 B
JavaScript
32 lines
794 B
JavaScript
// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax
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// Test that s->t field representation changes are done in-place.
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(function() {
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function O(x) { this.x = x; }
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const a = new O(42);
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const b = new O(-8);
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assertTrue(%HaveSameMap(a, b));
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a.x = null;
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assertTrue(%HaveSameMap(a, b));
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b.x = null;
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assertTrue(%HaveSameMap(a, b));
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})();
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// Test that h->t field representation changes are done in-place.
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(function() {
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function O(x) { this.x = x; }
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const a = new O(null);
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const b = new O("Hello");
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assertTrue(%HaveSameMap(a, b));
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a.x = 1;
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assertTrue(%HaveSameMap(a, b));
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b.x = 2;
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assertTrue(%HaveSameMap(a, b));
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})();
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