зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
4.7 KiB
C
113 строки
4.7 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Benoit Girard <bgirard@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* *************** SPS Sampler Information ****************
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*
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* SPS is an always on profiler that takes fast and low overheads samples
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* of the program execution using only userspace functionity for portability.
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* The goal of this module is to provide performance data in a generic
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* cross platform way without requiring custom tools or kernel support.
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*
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* Non goals: Support features that are platform specific or replace
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* platform specific profilers.
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*
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* Samples are collected to form a timeline with optional timeline event (markers)
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* used for filtering.
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*
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* SPS collects samples in a platform independant way by using a speudo stack abstraction
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* of the real program stack by using 'sample stack frames'. When a sample is collected
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* all active sample stack frames and the program counter are recorded.
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*/
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/* *************** SPS Sampler File Format ****************
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*
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* Simple new line seperated tag format:
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* S -> BOF tags EOF
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* tags -> tag tags
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* tag -> CHAR - STRING
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*
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* Tags:
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* 's' - Sample tag followed by the first stack frame followed by 0 or more 'c' tags.
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* 'c' - Continue Sample tag gives remaining tag element. If a 'c' tag is seen without
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* a preceding 's' tag it should be ignored. This is to support the behavior
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* of circular buffers.
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* If the 'stackwalk' feature is enabled this tag will have the format
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* 'l-<library name>@<hex address>' and will expect an external tool to translate
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* the tag into something readable through a symbolication processing step.
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* 'm' - Timeline marker. Zero or more may appear before a 's' tag.
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* 'l' - Information about the program counter library and address. Post processing
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* can include function and source line. If built with leaf data enabled
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* this tag will describe the last 'c' tag.
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* 'r' - Responsiveness tag following an 's' tag. Gives an indication on how well the
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* application is responding to the event loop. Lower is better.
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*
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* NOTE: File format is planned to be extended to include a dictionary to reduce size.
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*/
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#ifndef SAMPLER_H
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#define SAMPLER_H
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// Redefine the macros for platforms where SPS is supported.
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#ifdef MOZ_ENABLE_PROFILER_SPS
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#include "sps_sampler.h"
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#else
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// Initialize the sampler. Any other calls will be silently discarded
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// before the sampler has been initialized (i.e. early start-up code)
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#define SAMPLER_INIT()
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#define SAMPLER_DEINIT()
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#define SAMPLER_START(entries, interval, features, featureCount)
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#define SAMPLER_STOP()
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#define SAMPLER_IS_ACTIVE() false
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#define SAMPLER_SAVE()
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// Returned string must be free'ed
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#define SAMPLER_GET_PROFILE() NULL
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#define SAMPLER_GET_PROFILE_DATA(ctx) NULL
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#define SAMPLER_RESPONSIVENESS(time) NULL
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#define SAMPLER_GET_RESPONSIVENESS() NULL
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#define SAMPLER_GET_FEATURES() NULL
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#define SAMPLE_LABEL(name_space, info)
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#define SAMPLE_LABEL_FN(name_space, info)
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#define SAMPLE_MARKER(info)
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#endif
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#endif // ifndef SAMPLER_H
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