44 lines
909 B
JavaScript
44 lines
909 B
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: --allow-natives-syntax --maglev
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function addProperties(o) {
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// Add enough properties to exhaust the slack, so that adding the property
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// in `foo` will need to grow the property backing store.
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o.a1 = 1;
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o.a2 = 2;
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o.a3 = 3;
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o.a4 = 4;
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o.a5 = 5;
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o.a6 = 6;
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o.a7 = 7;
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}
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const s = new Set();
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function foo(o) {
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o.b = 2;
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}
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%PrepareFunctionForOptimization(foo);
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let o1 = {};
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addProperties(o1);
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// Make the StoreIC in `foo` polymorphic.
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foo(o1);
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foo({a: 0, b: 2});
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%OptimizeMaglevOnNextCall(foo);
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foo({a: 1, b: 3});
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let o2 = {};
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addProperties(o2);
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s.add(o2); // Force creating the hash.
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foo(o2);
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// Assert that the hash value was preseved when extending the properties
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// backing store.
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assertTrue(s.has(o2));
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