47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Test-only module in order to register objects later inspected by
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// the allocation tracker (in the same folder).
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//
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// We are going to store a weak reference to the passed objects,
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// in order to prevent holding them in memory.
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// Allocation tracker will then print detailed information
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// about why these objects are still allocated.
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const objects = [];
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/**
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* Request to track why the given object is kept in memory,
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* later on, when retrieving all the watched object via getAllNodeIds.
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*/
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export function track(obj) {
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// We store a weak reference, so that we do force keeping the object in memory!!
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objects.push(Cu.getWeakReference(obj));
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}
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/**
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* Return the NodeId's of all the objects passed via `track()` method.
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*
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* NodeId's are used by spidermonkey memory API to designates JS objects in head snapshots.
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*/
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export function getAllNodeIds() {
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// Filter out objects which have been freed already
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return (
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objects
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.map(weak => weak.get())
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.filter(obj => !!obj)
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// Convert objects from here instead of from allocation tracker in order
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// to be from the shared system compartment and avoid trying to compute the NodeId
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// of a wrapper!
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.map(ChromeUtils.getObjectNodeId)
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);
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}
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/**
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* Used by tests to clear all tracked objects
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*/
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export function clear() {
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objects.length = 0;
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}
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