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266 lines
10 KiB
C++
266 lines
10 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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#ifndef SPS_STANDALONE
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#include "js/TypeDecls.h"
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#endif
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#include "mozilla/UniquePtr.h"
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namespace mozilla {
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class TimeStamp;
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namespace dom {
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class Promise;
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} // namespace dom
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} // namespace mozilla
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enum TracingMetadata {
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TRACING_DEFAULT,
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TRACING_INTERVAL_START,
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TRACING_INTERVAL_END,
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TRACING_EVENT,
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TRACING_EVENT_BACKTRACE,
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TRACING_TIMESTAMP
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};
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#if !defined(MOZ_ENABLE_PROFILER_SPS) || defined(MOZILLA_XPCOMRT_API)
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#include <stdint.h>
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#include <stdarg.h>
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// Insert a RAII in this scope to active a pseudo label. Any samples collected
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// in this scope will contain this annotation. For dynamic strings use
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// PROFILER_LABEL_PRINTF. Arguments must be string literals.
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#define PROFILER_LABEL(name_space, info, category) do {} while (0)
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// Similar to PROFILER_LABEL, PROFILER_LABEL_FUNC will push/pop the enclosing
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// functon name as the pseudostack label.
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#define PROFILER_LABEL_FUNC(category) do {} while (0)
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// Format a dynamic string as a pseudo label. These labels will a considerable
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// storage size in the circular buffer compared to regular labels. This function
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// can be used to annotate custom information such as URL for the resource being
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// decoded or the size of the paint.
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#define PROFILER_LABEL_PRINTF(name_space, info, category, format, ...) do {} while (0)
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// Insert a marker in the profile timeline. This is useful to delimit something
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// important happening such as the first paint. Unlike profiler_label that are
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// only recorded if a sample is collected while it is active, marker will always
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// be collected.
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#define PROFILER_MARKER(info) do {} while (0)
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#define PROFILER_MARKER_PAYLOAD(info, payload) do { nsAutoPtr<ProfilerMarkerPayload> payloadDeletor(payload); } while (0)
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// Main thread specilization to avoid TLS lookup for performance critical use.
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#define PROFILER_MAIN_THREAD_LABEL(name_space, info, category) do {} while (0)
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#define PROFILER_MAIN_THREAD_LABEL_PRINTF(name_space, info, category, format, ...) do {} while (0)
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static inline void profiler_tracing(const char* aCategory, const char* aInfo,
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TracingMetadata metaData = TRACING_DEFAULT) {}
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class ProfilerBacktrace;
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static inline void profiler_tracing(const char* aCategory, const char* aInfo,
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ProfilerBacktrace* aCause,
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TracingMetadata metaData = TRACING_DEFAULT) {}
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// Initilize the profiler TLS, signal handlers on linux. If MOZ_PROFILER_STARTUP
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// is set the profiler will be started. This call must happen before any other
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// sampler calls. Particularly sampler_label/sampler_marker.
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static inline void profiler_init(void* stackTop) {};
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// Clean up the profiler module, stopping it if required. This function may
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// also save a shutdown profile if requested. No profiler calls should happen
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// after this point and all pseudo labels should have been popped.
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static inline void profiler_shutdown() {};
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// Start the profiler with the selected options. The samples will be
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// recorded in a circular buffer.
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// "aProfileEntries" is an abstract size indication of how big
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// the profile's circular buffer should be. Multiply by 4
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// words to get the cost.
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// "aInterval" the sampling interval. The profiler will do its
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// best to sample at this interval. The profiler visualization
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// should represent the actual sampling accuracy.
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static inline void profiler_start(int aProfileEntries, double aInterval,
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const char** aFeatures, uint32_t aFeatureCount,
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const char** aThreadNameFilters, uint32_t aFilterCount) {}
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// Stop the profiler and discard the profile. Call 'profiler_save' before this
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// to retrieve the profile.
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static inline void profiler_stop() {}
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// These functions pause and resume the profiler. While paused the profile will not
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// take any samples and will not record any data into its buffers. The profiler
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// remains fully initialized in this state. Timeline markers will still be stored.
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// This feature will keep javascript profiling enabled, thus allowing toggling the
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// profiler without invalidating the JIT.
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static inline bool profiler_is_paused() { return false; }
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static inline void profiler_pause() {}
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static inline void profiler_resume() {}
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// Immediately capture the current thread's call stack and return it
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static inline ProfilerBacktrace* profiler_get_backtrace() { return nullptr; }
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static inline void profiler_get_backtrace_noalloc(char *output, size_t outputSize) { return; }
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// Free a ProfilerBacktrace returned by profiler_get_backtrace()
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static inline void profiler_free_backtrace(ProfilerBacktrace* aBacktrace) {}
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static inline bool profiler_is_active() { return false; }
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// Check if an external profiler feature is active.
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// Supported:
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// * gpu
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static inline bool profiler_feature_active(const char*) { return false; }
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// Internal-only. Used by the event tracer.
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static inline void profiler_responsiveness(const mozilla::TimeStamp& aTime) {}
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// Internal-only.
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static inline void profiler_set_frame_number(int frameNumber) {}
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// Get the profile encoded as a JSON string.
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static inline mozilla::UniquePtr<char[]> profiler_get_profile(double aSinceTime = 0) {
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return nullptr;
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}
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// Get the profile encoded as a JSON object.
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static inline JSObject* profiler_get_profile_jsobject(JSContext* aCx,
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double aSinceTime = 0) {
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return nullptr;
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}
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#ifndef SPS_STANDALONE
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// Get the profile encoded as a JSON object.
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static inline void profiler_get_profile_jsobject_async(double aSinceTime = 0,
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mozilla::dom::Promise* = 0) {}
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#endif
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// Get the profile and write it into a file
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static inline void profiler_save_profile_to_file(char* aFilename) { }
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// Get the features supported by the profiler that are accepted by profiler_init.
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// Returns a null terminated char* array.
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static inline char** profiler_get_features() { return nullptr; }
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// Get information about the current buffer status.
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// Retursn (using outparams) the current write position in the buffer,
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// the total size of the buffer, and the generation of the buffer.
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// This information may be useful to a user-interface displaying the
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// current status of the profiler, allowing the user to get a sense
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// for how fast the buffer is being written to, and how much
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// data is visible.
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static inline void profiler_get_buffer_info(uint32_t *aCurrentPosition,
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uint32_t *aTotalSize,
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uint32_t *aGeneration)
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{
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*aCurrentPosition = 0;
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*aTotalSize = 0;
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*aGeneration = 0;
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}
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// Discard the profile, throw away the profile and notify 'profiler-locked'.
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// This function is to be used when entering private browsing to prevent
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// the profiler from collecting sensitive data.
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static inline void profiler_lock() {}
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// Re-enable the profiler and notify 'profiler-unlocked'.
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static inline void profiler_unlock() {}
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static inline void profiler_register_thread(const char* name, void* stackTop) {}
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static inline void profiler_unregister_thread() {}
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// These functions tell the profiler that a thread went to sleep so that we can avoid
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// sampling it while it's sleeping. Calling profiler_sleep_start() twice without
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// profiler_sleep_end() is an error.
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static inline void profiler_sleep_start() {}
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static inline void profiler_sleep_end() {}
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// Call by the JSRuntime's operation callback. This is used to enable
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// profiling on auxilerary threads.
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static inline void profiler_js_operation_callback() {}
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static inline double profiler_time() { return 0; }
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static inline double profiler_time(const mozilla::TimeStamp& aTime) { return 0; }
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static inline bool profiler_in_privacy_mode() { return false; }
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static inline void profiler_log(const char *str) {}
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static inline void profiler_log(const char *fmt, va_list args) {}
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#else
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#include "GeckoProfilerImpl.h"
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#endif
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class GeckoProfilerInitRAII {
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public:
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explicit GeckoProfilerInitRAII(void* stackTop) {
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profiler_init(stackTop);
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}
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~GeckoProfilerInitRAII() {
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profiler_shutdown();
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}
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};
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class GeckoProfilerSleepRAII {
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public:
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GeckoProfilerSleepRAII() {
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profiler_sleep_start();
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}
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~GeckoProfilerSleepRAII() {
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profiler_sleep_end();
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}
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};
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#endif // ifndef SAMPLER_H
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