46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
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// Copyright 2024 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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//
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// Flags: --maglev --allow-natives-syntax
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// Flags: --maglev-skip-migration-check-for-polymorphic-access
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// Like no-deopt-deprecated-map.js, but we pass a flag to skip the map
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// migration.
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// This object will later have a deprecated map.
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let o1 = {y: 0, a: 1};
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// These 2 objects will always have the same map. We use two
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// of them to make sure we're not embedding the object itself
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// as a constant.
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let o2_1 = {y: 0, a: 1};
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let o2_2 = {y: 0, a: 1};
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// An unrelated object just to make the IC polymorphic.
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let o3 = {x: 0, y: 0, a: 1};
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// Make o1's map deprecated. o2_1 and o2_2 have the same map.
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o2_1.a = 3.1415;
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o2_2.a = 4.12;
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function foo(o) {
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o.y = 2; // Polymorpic property store.
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}
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%PrepareFunctionForOptimization(foo);
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// Collect the feedback.
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foo(o2_1);
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foo(o2_2);
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foo(o3); // Make it polymorphic.
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%OptimizeMaglevOnNextCall(foo);
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foo(o2_1);
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assertTrue(isMaglevved(foo));
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// Calling foo with a deprecated map will deopt, since we don't try to migrate
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// the object.
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foo(o1);
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assertFalse(isMaglevved(foo));
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