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Since we can't rely on shape identity (i.e its pointer address) for unique shapes, give them a serial number that increments whenever a mutation occurs. Inline caches can then compare this serial number against what they have seen before.
18 lines
438 B
JavaScript
18 lines
438 B
JavaScript
test("Inline cache invalidated by deleting property from unique shape", () => {
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// Create an object with an unique shape by adding a huge amount of properties.
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let o = {};
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for (let x = 0; x < 1000; ++x) {
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o["prop" + x] = x;
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}
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function ic(o) {
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return o.prop2;
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}
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let first = ic(o);
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delete o.prop2;
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let second = ic(o);
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expect(first).toBe(2);
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expect(second).toBeUndefined();
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});
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