Last change
on this file since 6a80231 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | 'use strict';
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| 2 |
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| 3 | let fastProto = null;
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| 4 |
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| 5 | // Creates an object with permanently fast properties in V8. See Toon Verwaest's
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| 6 | // post https://medium.com/@tverwaes/setting-up-prototypes-in-v8-ec9c9491dfe2#5f62
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| 7 | // for more details. Use %HasFastProperties(object) and the Node.js flag
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| 8 | // --allow-natives-syntax to check whether an object has fast properties.
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| 9 | function FastObject(o) {
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| 10 | // A prototype object will have "fast properties" enabled once it is checked
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| 11 | // against the inline property cache of a function, e.g. fastProto.property:
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| 12 | // https://github.com/v8/v8/blob/6.0.122/test/mjsunit/fast-prototype.js#L48-L63
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| 13 | if (fastProto !== null && typeof fastProto.property) {
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| 14 | const result = fastProto;
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| 15 | fastProto = FastObject.prototype = null;
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| 16 | return result;
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| 17 | }
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| 18 | fastProto = FastObject.prototype = o == null ? Object.create(null) : o;
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| 19 | return new FastObject;
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| 20 | }
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| 21 |
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| 22 | // Initialize the inline property cache of FastObject
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| 23 | FastObject();
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| 24 |
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| 25 | module.exports = function toFastproperties(o) {
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| 26 | return FastObject(o);
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| 27 | };
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