Alexandre Poirot
a3839a84f3
I'm moving the logic to understand the memory graphs in a dedicated module in order to keep allocation tracker focused on the recording. Differential Revision: https://phabricator.services.mozilla.com/D267822
53 lines
1.7 KiB
JavaScript
53 lines
1.7 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 getStillAllocatedObjects.
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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 reference and NodeId's of all the objects passed via `track()` method,
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* which are still hold in memory.
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*
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* NodeId's are used by spidermonkey memory API to designates JS objects in heap snapshots.
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*/
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export function getStillAllocatedObjects() {
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return (
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objects
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// Filter out objects which have been freed already
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.filter(ref => !!ref.get())
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.map(weakRef => {
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return {
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weakRef,
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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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ubiNodeId: ChromeUtils.getObjectNodeId(weakRef.get()),
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};
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})
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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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