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73 lines
2.9 KiB
Plaintext
73 lines
2.9 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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/**
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* The memory profiler samples allocation events. An allocation event
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* includes a type (what and at where is going to be allocated), a
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* size, a timestamp and the corresponding stack trace. Free events
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* are also tracked. For managed languages, namely languages relying
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* on garbage collection, a free event is generated when an object is
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* reclaimed by the garbage collector. These sampled events can be
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* used to approximate the full history of allocations afterwards.
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* That means we can get various memory profiles of a program in
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* different perspectives by post-processing the history in different
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* ways. The profiler is designed at the very beginning to support not
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* only JavaScript but also native codes. Naturally, not only
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* JavaScript objects but also native allocations are tracked.
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*
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* The result returned is the sampled allocation event traces in a
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* compact format. The events is sorted according to the timestamp
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* when the event happened. Each event has a trace index pointing to
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* the traces table. Each trace entry has a name index pointing to the
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* names table and a parent index pointing to the parent trace in the
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* traces table. By following the trace index one could rebuild the
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* complete backtrace of an allocation event.
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*
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* [ Events ]
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* +-------+-------+ +-------+
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* | Size | Size | | Size |
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* |-------|-------| |-------|
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* | Time | Time |......| Time |
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* |-------|-------| |-------|
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* +-- Trace | Trace | | Trace |
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* | +-------+-------+ +-------+
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* |
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* | [ Traces ]
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* +->--------+--------+ +--------+ +--------+
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* -| Name | Name | | Name | | Name |
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* / |--------|--------|...|--------|...|--------|
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* | | Parent | Parent | | Parent | | Parent |
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* | +---|----+----^--++ +--^--|--+ +---^----+
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* | | | | | | |
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* | +---------+ +-------+ +----------+
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* | [ Names ]
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* | +-----------------+-----------------+
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* +-> Function name | Function name |
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* | & line numbers | & line numbers |......
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* +-----------------+-----------------+
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*
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*/
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[scriptable, uuid(1e10e7a9-bc05-4878-a687-36c9ea4428b1)]
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interface nsIMemoryProfiler : nsISupports
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{
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void startProfiler();
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void stopProfiler();
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void resetProfiler();
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/**
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* Get results in an object which contains three tables:
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* {
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* names, // an array of function names and positions
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* traces, // an array of {nameIdx, parentIdx}
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* events, // an array of {size, timestamp, traceIdx}
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* }
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* Should only be called after stopProfiler.
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*/
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[implicit_jscontext]
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jsval getResults();
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};
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