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