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This is the initial work to bootstrap Web interfaces that are defined with extended attributes `[Exposed=*]`. The ShadowRealm instances are garbage-collected once it is unreachable. However, V8 can not infer the reference cycles between the per-realm strong persistent function handles and the realm's context handle. To allow the context to be gc-ed once it is not reachable, the per-realm persistent handles are attached to the context's global object and the persistent handles are set as weak. PR-URL: https://github.com/nodejs/node/pull/46809 Refs: https://github.com/nodejs/node/issues/42528 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
// Flags: --expose-internals
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'use strict';
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// This tests that Environment is tracked in heap snapshots.
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require('../common');
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const { validateSnapshotNodes } = require('../common/heap');
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// This is just using ContextifyScript as an example here, it can be replaced
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// with any BaseObject that we can easily instantiate here and register in
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// cleanup hooks.
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// These can all be changed to reflect the status of how these objects
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// are captured in the snapshot.
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const context = require('vm').createScript('const foo = 123');
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validateSnapshotNodes('Node / Environment', [{
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children: [
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{ node_name: 'Node / CleanupQueue', edge_name: 'cleanup_queue' },
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{ node_name: 'Node / IsolateData', edge_name: 'isolate_data' },
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{ node_name: 'Node / PrincipalRealm', edge_name: 'principal_realm' },
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],
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}]);
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validateSnapshotNodes('Node / CleanupQueue', [
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// The first one is the cleanup_queue of the Environment.
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{},
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// The second one is the cleanup_queue of the principal realm.
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{
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children: [
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{ node_name: 'Node / ContextifyScript' },
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],
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},
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]);
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validateSnapshotNodes('Node / PrincipalRealm', [{
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children: [
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{ node_name: 'process', edge_name: 'process_object' },
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],
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}]);
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console.log(context); // Make sure it's not GC'ed
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