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85 lines
3.5 KiB
C
85 lines
3.5 KiB
C
/* -*- Mode: C++; 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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/* *************** 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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* 't' - Elapse time since recording started.
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*
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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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// Provide a default literal string to use if profiling is disabled
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// and a printf argument to be computed if profiling is enabled.
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// NOTE: This will store the formated string on the stack and consume
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// over 128 bytes on the stack.
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#define SAMPLE_LABEL_PRINTF(name_space, info, format, ...)
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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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