41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
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// Copyright 2023 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: --harmony-struct
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// Shared objects have fixed layout and cannot have their properties
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// redefined. They are constructed sealed. In ordinary objects, sealed objects
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// can be redefined to be frozen. This is disallowed for shared objects.
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function TestSharedObjectCannotRedefineProperty(sharedObj) {
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function TestRedefine(sharedObj, propName) {
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if (Object.hasOwn(sharedObj, propName)) {
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assertThrows(() => Object.defineProperty(sharedObj, propName, {
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value: 99,
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enumerable: true,
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writable: false,
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configurable: false
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}));
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Object.defineProperty(
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sharedObj, propName,
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{value: 99, enumerable: true, writable: true, configurable: false});
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assertEquals(99, sharedObj[propName]);
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}
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}
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TestRedefine(sharedObj, 'p');
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TestRedefine(sharedObj, '0');
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// Objects without any properties are a degenerate case and are considered
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// frozen (or any integrity level, really).
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if (Object.getOwnPropertyNames(sharedObj).length > 0) {
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assertThrows(() => Object.freeze(sharedObj));
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}
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assertTrue(Object.isSealed(sharedObj));
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}
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TestSharedObjectCannotRedefineProperty(new Atomics.Condition());
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TestSharedObjectCannotRedefineProperty(new Atomics.Mutex());
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TestSharedObjectCannotRedefineProperty(new (new SharedStructType(['p'])));
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TestSharedObjectCannotRedefineProperty(new SharedArray(1));
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