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54 lines
2.0 KiB
Plaintext
54 lines
2.0 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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/**
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* A HeapSnapshot represents a snapshot of the heap graph
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*/
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[ChromeOnly, Exposed=(Window,System,Worker)]
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interface HeapSnapshot {
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/**
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* Take a census of the heap snapshot.
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*
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* This is the same as |Debugger.Memory.prototype.takeCensus|, but operates on
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* the offline heap snapshot's serialized heap graph rather than the live heap
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* graph. The same optional configuration options that can be passed to that
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* function can be passed here.
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*
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* The returned value is determined by the `"breakdown"` option used, and is
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* usually a `Map`, `Object`, or `Array`. For example, the following breakdown
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*
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* {
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* by: "coarseType",
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* objects: { by: "objectClass" },
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* other: { by: "internalType" }
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* }
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*
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* produces a result like this:
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*
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* {
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* "objects": {
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* "Function": { "count": 404, "bytes": 37328 },
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* "Object": { "count": 11, "bytes": 1264 },
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* "Debugger": { "count": 1, "bytes": 416 },
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* "ScriptSource": { "count": 1, "bytes": 64 },
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* // ... omitted for brevity...
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* },
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* "scripts": { "count": 1, "bytes": 0 },
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* "strings": { "count": 701, "bytes": 49080 },
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* "other": {
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* "js::Shape": { "count": 450, "bytes": 0 },
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* "js::BaseShape": { "count": 21, "bytes": 0 },
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* "js::ObjectGroup": { "count": 17, "bytes": 0 }
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* }
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* }
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*
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* See the `takeCensus` section of the `js/src/doc/Debugger/Debugger.Memory.md`
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* file for detailed documentation.
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*/
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[Throws]
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any takeCensus(object? options);
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};
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