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gecko-dev/tools/profiler/platform.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <ostream>
#include <fstream>
#include <sstream>
#include <errno.h>
#include "IOInterposer.h"
#include "NSPRInterposer.h"
#include "ProfilerIOInterposeObserver.h"
#include "platform.h"
#include "PlatformMacros.h"
#include "prenv.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/ThreadLocal.h"
#include "PseudoStack.h"
#include "TableTicker.h"
#include "UnwinderThread2.h"
#include "nsIObserverService.h"
#include "nsDirectoryServiceUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "mozilla/Services.h"
#include "nsThreadUtils.h"
#include "ProfilerMarkers.h"
#include "nsXULAppAPI.h"
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
#include "AndroidBridge.h"
using namespace mozilla::widget::android;
#endif
mozilla::ThreadLocal<PseudoStack *> tlsPseudoStack;
mozilla::ThreadLocal<TableTicker *> tlsTicker;
mozilla::ThreadLocal<void *> tlsStackTop;
// We need to track whether we've been initialized otherwise
// we end up using tlsStack without initializing it.
// Because tlsStack is totally opaque to us we can't reuse
// it as the flag itself.
bool stack_key_initialized;
TimeStamp sLastTracerEvent; // is raced on
TimeStamp sStartTime;
int sFrameNumber = 0;
int sLastFrameNumber = 0;
int sInitCount = 0; // Each init must have a matched shutdown.
static bool sIsProfiling = false; // is raced on
// env variables to control the profiler
const char* PROFILER_MODE = "MOZ_PROFILER_MODE";
const char* PROFILER_INTERVAL = "MOZ_PROFILER_INTERVAL";
const char* PROFILER_ENTRIES = "MOZ_PROFILER_ENTRIES";
const char* PROFILER_STACK = "MOZ_PROFILER_STACK_SCAN";
const char* PROFILER_FEATURES = "MOZ_PROFILING_FEATURES";
/* used to keep track of the last event that we sampled during */
unsigned int sLastSampledEventGeneration = 0;
/* a counter that's incremented everytime we get responsiveness event
* note: it might also be worth trackplaing everytime we go around
* the event loop */
unsigned int sCurrentEventGeneration = 0;
/* we don't need to worry about overflow because we only treat the
* case of them being the same as special. i.e. we only run into
* a problem if 2^32 events happen between samples that we need
* to know are associated with different events */
std::vector<ThreadInfo*>* Sampler::sRegisteredThreads = nullptr;
mozilla::Mutex* Sampler::sRegisteredThreadsMutex = nullptr;
TableTicker* Sampler::sActiveSampler;
static mozilla::StaticAutoPtr<mozilla::ProfilerIOInterposeObserver>
sInterposeObserver;
// The name that identifies the gecko thread for calls to
// profiler_register_thread. For all platform except metro
// the thread that calls mozilla_sampler_init is considered
// the gecko thread. With metro the gecko thread is
// registered later based on this thread name.
static const char * gGeckoThreadName = "GeckoMain";
void Sampler::Startup() {
sRegisteredThreads = new std::vector<ThreadInfo*>();
sRegisteredThreadsMutex = new mozilla::Mutex("sRegisteredThreads mutex");
}
void Sampler::Shutdown() {
while (sRegisteredThreads->size() > 0) {
delete sRegisteredThreads->back();
sRegisteredThreads->pop_back();
}
delete sRegisteredThreadsMutex;
delete sRegisteredThreads;
// UnregisterThread can be called after shutdown in XPCShell. Thus
// we need to point to null to ignore such a call after shutdown.
sRegisteredThreadsMutex = nullptr;
sRegisteredThreads = nullptr;
}
ThreadInfo::~ThreadInfo() {
free(mName);
if (mProfile)
delete mProfile;
Sampler::FreePlatformData(mPlatformData);
}
ProfilerMarker::ProfilerMarker(const char* aMarkerName,
ProfilerMarkerPayload* aPayload)
: mMarkerName(strdup(aMarkerName))
, mPayload(aPayload)
{
}
ProfilerMarker::~ProfilerMarker() {
free(mMarkerName);
delete mPayload;
}
void
ProfilerMarker::SetGeneration(int aGenID) {
mGenID = aGenID;
}
template<typename Builder> void
ProfilerMarker::BuildJSObject(Builder& b, typename Builder::ArrayHandle markers) const {
typename Builder::RootedObject marker(b.context(), b.CreateObject());
b.DefineProperty(marker, "name", GetMarkerName());
// TODO: Store the callsite for this marker if available:
// if have location data
// b.DefineProperty(marker, "location", ...);
if (mPayload) {
typename Builder::RootedObject markerData(b.context(),
mPayload->PreparePayload(b));
b.DefineProperty(marker, "data", markerData);
}
b.ArrayPush(markers, marker);
}
template void
ProfilerMarker::BuildJSObject<JSCustomObjectBuilder>(JSCustomObjectBuilder& b,
JSCustomObjectBuilder::ArrayHandle markers) const;
template void
ProfilerMarker::BuildJSObject<JSObjectBuilder>(JSObjectBuilder& b,
JSObjectBuilder::ArrayHandle markers) const;
PendingMarkers::~PendingMarkers() {
clearMarkers();
if (mSignalLock != false) {
// We're releasing the pseudostack while it's still in use.
// The label macros keep a non ref counted reference to the
// stack to avoid a TLS. If these are not all cleared we will
// get a use-after-free so better to crash now.
abort();
}
}
void
PendingMarkers::addMarker(ProfilerMarker *aMarker) {
mSignalLock = true;
STORE_SEQUENCER();
MOZ_ASSERT(aMarker);
mPendingMarkers.insert(aMarker);
// Clear markers that have been overwritten
while (mStoredMarkers.peek() &&
mStoredMarkers.peek()->HasExpired(mGenID)) {
delete mStoredMarkers.popHead();
}
STORE_SEQUENCER();
mSignalLock = false;
}
void
PendingMarkers::updateGeneration(int aGenID) {
mGenID = aGenID;
}
void
PendingMarkers::addStoredMarker(ProfilerMarker *aStoredMarker) {
aStoredMarker->SetGeneration(mGenID);
mStoredMarkers.insert(aStoredMarker);
}
bool sps_version2()
{
static int version = 0; // Raced on, potentially
if (version == 0) {
bool allow2 = false; // Is v2 allowable on this platform?
# if defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_arm_android) \
|| defined(SPS_PLAT_x86_linux)
allow2 = true;
# elif defined(SPS_PLAT_amd64_darwin) || defined(SPS_PLAT_x86_darwin) \
|| defined(SPS_PLAT_x86_windows) || defined(SPS_PLAT_x86_android) \
|| defined(SPS_PLAT_amd64_windows)
allow2 = false;
# else
# error "Unknown platform"
# endif
bool req2 = PR_GetEnv("MOZ_PROFILER_NEW") != nullptr; // Has v2 been requested?
bool elfhackd = false;
# if defined(USE_ELF_HACK)
bool elfhackd = true;
# endif
if (req2 && allow2) {
version = 2;
LOG("------------------- MOZ_PROFILER_NEW set -------------------");
} else if (req2 && !allow2) {
version = 1;
LOG("--------------- MOZ_PROFILER_NEW requested, ----------------");
LOG("---------- but is not available on this platform -----------");
} else if (req2 && elfhackd) {
version = 1;
LOG("--------------- MOZ_PROFILER_NEW requested, ----------------");
LOG("--- but this build was not done with --disable-elf-hack ----");
} else {
version = 1;
LOG("----------------- MOZ_PROFILER_NEW not set -----------------");
}
}
return version == 2;
}
#if !defined(ANDROID)
/* Has MOZ_PROFILER_VERBOSE been set? */
bool moz_profiler_verbose()
{
/* 0 = not checked, 1 = unset, 2 = set */
static int status = 0; // Raced on, potentially
if (status == 0) {
if (PR_GetEnv("MOZ_PROFILER_VERBOSE") != nullptr)
status = 2;
else
status = 1;
}
return status == 2;
}
#endif
static inline const char* name_UnwMode(UnwMode m)
{
switch (m) {
case UnwINVALID: return "invalid";
case UnwNATIVE: return "native";
case UnwPSEUDO: return "pseudo";
case UnwCOMBINED: return "combined";
default: return "??name_UnwMode??";
}
}
bool set_profiler_mode(const char* mode) {
if (mode) {
if (0 == strcmp(mode, "pseudo")) {
sUnwindMode = UnwPSEUDO;
return true;
}
else if (0 == strcmp(mode, "native") && is_native_unwinding_avail()) {
sUnwindMode = UnwNATIVE;
return true;
}
else if (0 == strcmp(mode, "combined") && is_native_unwinding_avail()) {
sUnwindMode = UnwCOMBINED;
return true;
} else {
return false;
}
}
return true;
}
bool set_profiler_interval(const char* interval) {
if (interval) {
errno = 0;
long int n = strtol(interval, (char**)nullptr, 10);
if (errno == 0 && n >= 1 && n <= 1000) {
sUnwindInterval = n;
return true;
}
return false;
}
return true;
}
bool set_profiler_entries(const char* entries) {
if (entries) {
errno = 0;
long int n = strtol(entries, (char**)nullptr, 10);
if (errno == 0 && n > 0) {
sProfileEntries = n;
return true;
}
return false;
}
return true;
}
bool set_profiler_scan(const char* scanCount) {
if (scanCount) {
errno = 0;
long int n = strtol(scanCount, (char**)nullptr, 10);
if (errno == 0 && n >= 0 && n <= 100) {
sUnwindStackScan = n;
return true;
}
return false;
}
return true;
}
bool is_native_unwinding_avail() {
# if defined(HAVE_NATIVE_UNWIND)
return true;
#else
return false;
#endif
}
// Read env vars at startup, so as to set sUnwindMode and sInterval.
void read_profiler_env_vars()
{
bool nativeAvail = is_native_unwinding_avail();
/* Set defaults */
sUnwindMode = nativeAvail ? UnwCOMBINED : UnwPSEUDO;
sUnwindInterval = 0; /* We'll have to look elsewhere */
sProfileEntries = 0;
const char* stackMode = PR_GetEnv(PROFILER_MODE);
const char* interval = PR_GetEnv(PROFILER_INTERVAL);
const char* entries = PR_GetEnv(PROFILER_ENTRIES);
const char* scanCount = PR_GetEnv(PROFILER_STACK);
if (!set_profiler_mode(stackMode) ||
!set_profiler_interval(interval) ||
!set_profiler_entries(entries) ||
!set_profiler_scan(scanCount)) {
profiler_usage();
} else {
LOG( "SPS:");
LOGF("SPS: Unwind mode = %s", name_UnwMode(sUnwindMode));
LOGF("SPS: Sampling interval = %d ms (zero means \"platform default\")",
(int)sUnwindInterval);
LOGF("SPS: Entry store size = %d (zero means \"platform default\")",
(int)sProfileEntries);
LOGF("SPS: UnwindStackScan = %d (max dubious frames per unwind).",
(int)sUnwindStackScan);
LOG( "SPS: Use env var MOZ_PROFILER_MODE=help for further information.");
LOG( "SPS:");
}
}
void profiler_usage() {
LOG( "SPS: ");
LOG( "SPS: Environment variable usage:");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_MODE=native for native unwind only");
LOG( "SPS: MOZ_PROFILER_MODE=pseudo for pseudo unwind only");
LOG( "SPS: MOZ_PROFILER_MODE=combined for combined native & pseudo unwind");
LOG( "SPS: If unset, default is 'combined' on native-capable");
LOG( "SPS: platforms, 'pseudo' on others.");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_INTERVAL=<number> (milliseconds, 1 to 1000)");
LOG( "SPS: If unset, platform default is used.");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_ENTRIES=<number> (count, minimum of 1)");
LOG( "SPS: If unset, platform default is used.");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_VERBOSE");
LOG( "SPS: If set to any value, increases verbosity (recommended).");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_STACK_SCAN=<number> (default is zero)");
LOG( "SPS: The number of dubious (stack-scanned) frames allowed");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_NEW");
LOG( "SPS: Needs to be set to use Breakpad-based unwinding.");
LOG( "SPS: ");
LOGF("SPS: This platform %s native unwinding.",
is_native_unwinding_avail() ? "supports" : "does not support");
LOG( "SPS: ");
/* Re-set defaults */
sUnwindMode = is_native_unwinding_avail() ? UnwCOMBINED : UnwPSEUDO;
sUnwindInterval = 0; /* We'll have to look elsewhere */
sProfileEntries = 0;
sUnwindStackScan = 0;
LOG( "SPS:");
LOGF("SPS: Unwind mode = %s", name_UnwMode(sUnwindMode));
LOGF("SPS: Sampling interval = %d ms (zero means \"platform default\")",
(int)sUnwindInterval);
LOGF("SPS: Entry store size = %d (zero means \"platform default\")",
(int)sProfileEntries);
LOGF("SPS: UnwindStackScan = %d (max dubious frames per unwind).",
(int)sUnwindStackScan);
LOG( "SPS: Use env var MOZ_PROFILER_MODE=help for further information.");
LOG( "SPS:");
return;
}
void set_tls_stack_top(void* stackTop)
{
// Round |stackTop| up to the end of the containing page. We may
// as well do this -- there's no danger of a fault, and we might
// get a few more base-of-the-stack frames as a result. This
// assumes that no target has a page size smaller than 4096.
uintptr_t stackTopR = (uintptr_t)stackTop;
if (stackTop) {
stackTopR = (stackTopR & ~(uintptr_t)4095) + (uintptr_t)4095;
}
tlsStackTop.set((void*)stackTopR);
}
bool is_main_thread_name(const char* aName) {
if (!aName) {
return false;
}
return strcmp(aName, gGeckoThreadName) == 0;
}
////////////////////////////////////////////////////////////////////////
// BEGIN externally visible functions
void mozilla_sampler_init(void* stackTop)
{
sInitCount++;
if (stack_key_initialized)
return;
LOG("BEGIN mozilla_sampler_init");
if (!tlsPseudoStack.init() || !tlsTicker.init() || !tlsStackTop.init()) {
LOG("Failed to init.");
return;
}
stack_key_initialized = true;
Sampler::Startup();
PseudoStack *stack = new PseudoStack();
tlsPseudoStack.set(stack);
bool isMainThread = true;
#ifdef XP_WIN
// For metrofx, we'll register the main thread once it's created.
isMainThread = !(XRE_GetWindowsEnvironment() == WindowsEnvironmentType_Metro);
#endif
Sampler::RegisterCurrentThread(isMainThread ?
gGeckoThreadName : "Application Thread",
stack, isMainThread, stackTop);
// Read mode settings from MOZ_PROFILER_MODE and interval
// settings from MOZ_PROFILER_INTERVAL and stack-scan threshhold
// from MOZ_PROFILER_STACK_SCAN.
read_profiler_env_vars();
// Allow the profiler to be started using signals
OS::RegisterStartHandler();
// Initialize I/O interposing
mozilla::IOInterposer::Init();
// Initialize NSPR I/O Interposing
mozilla::InitNSPRIOInterposing();
// We can't open pref so we use an environment variable
// to know if we should trigger the profiler on startup
// NOTE: Default
const char *val = PR_GetEnv("MOZ_PROFILER_STARTUP");
if (!val || !*val) {
return;
}
const char* features[] = {"js"
, "leaf"
#if defined(XP_WIN) || defined(XP_MACOSX) || (defined(SPS_ARCH_arm) && defined(linux))
, "stackwalk"
#endif
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
, "java"
#endif
};
profiler_start(PROFILE_DEFAULT_ENTRY, PROFILE_DEFAULT_INTERVAL,
features, sizeof(features)/sizeof(const char*),
// TODO Add env variable to select threads
nullptr, 0);
LOG("END mozilla_sampler_init");
}
void mozilla_sampler_shutdown()
{
sInitCount--;
if (sInitCount > 0)
return;
// Save the profile on shutdown if requested.
TableTicker *t = tlsTicker.get();
if (t) {
const char *val = PR_GetEnv("MOZ_PROFILER_SHUTDOWN");
if (val) {
std::ofstream stream;
stream.open(val);
if (stream.is_open()) {
t->ToStreamAsJSON(stream);
stream.close();
}
}
}
profiler_stop();
// Unregister IO interpose observer
mozilla::IOInterposer::Unregister(mozilla::IOInterposeObserver::OpAll,
sInterposeObserver);
// mozilla_sampler_shutdown is only called at shutdown, and late-write checks
// might need the IO interposer, so we don't clear it. Don't worry it's
// designed not to report leaks.
// mozilla::IOInterposer::Clear();
mozilla::ClearNSPRIOInterposing();
sInterposeObserver = nullptr;
Sampler::Shutdown();
// We can't delete the Stack because we can be between a
// sampler call_enter/call_exit point.
// TODO Need to find a safe time to delete Stack
}
void mozilla_sampler_save()
{
TableTicker *t = tlsTicker.get();
if (!t) {
return;
}
t->RequestSave();
// We're on the main thread already so we don't
// have to wait to handle the save request.
t->HandleSaveRequest();
}
char* mozilla_sampler_get_profile()
{
TableTicker *t = tlsTicker.get();
if (!t) {
return nullptr;
}
std::stringstream stream;
t->ToStreamAsJSON(stream);
char* profile = strdup(stream.str().c_str());
return profile;
}
JSObject *mozilla_sampler_get_profile_data(JSContext *aCx)
{
TableTicker *t = tlsTicker.get();
if (!t) {
return nullptr;
}
return t->ToJSObject(aCx);
}
const char** mozilla_sampler_get_features()
{
static const char* features[] = {
#if defined(MOZ_PROFILING) && defined(HAVE_NATIVE_UNWIND)
// Walk the C++ stack.
"stackwalk",
#endif
#if defined(ENABLE_SPS_LEAF_DATA)
// Include the C++ leaf node if not stackwalking. DevTools
// profiler doesn't want the native addresses.
"leaf",
#endif
#if !defined(SPS_OS_windows)
// Use a seperate thread of walking the stack.
"unwinder",
#endif
"java",
// Only record samples during periods of bad responsiveness
"jank",
// Tell the JS engine to emmit pseudostack entries in the
// pro/epilogue.
"js",
// Profile the registered secondary threads.
"threads",
// Do not include user-identifiable information
"privacy",
// Add main thread I/O to the profile
"mainthreadio",
#if defined(XP_WIN)
// Add power collection
"power",
#endif
nullptr
};
return features;
}
// Values are only honored on the first start
void mozilla_sampler_start(int aProfileEntries, double aInterval,
const char** aFeatures, uint32_t aFeatureCount,
const char** aThreadNameFilters, uint32_t aFilterCount)
{
if (!stack_key_initialized)
profiler_init(nullptr);
/* If the sampling interval was set using env vars, use that
in preference to anything else. */
if (sUnwindInterval > 0)
aInterval = sUnwindInterval;
/* If the entry count was set using env vars, use that, too: */
if (sProfileEntries > 0)
aProfileEntries = sProfileEntries;
// Reset the current state if the profiler is running
profiler_stop();
TableTicker* t;
t = new TableTicker(aInterval ? aInterval : PROFILE_DEFAULT_INTERVAL,
aProfileEntries ? aProfileEntries : PROFILE_DEFAULT_ENTRY,
aFeatures, aFeatureCount,
aThreadNameFilters, aFilterCount);
if (t->HasUnwinderThread()) {
// Create the unwinder thread. ATM there is only one.
uwt__init();
}
tlsTicker.set(t);
t->Start();
if (t->ProfileJS() || t->InPrivacyMode()) {
mozilla::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
std::vector<ThreadInfo*> threads = t->GetRegisteredThreads();
for (uint32_t i = 0; i < threads.size(); i++) {
ThreadInfo* info = threads[i];
ThreadProfile* thread_profile = info->Profile();
if (!thread_profile) {
continue;
}
if (t->ProfileJS()) {
thread_profile->GetPseudoStack()->enableJSSampling();
}
if (t->InPrivacyMode()) {
thread_profile->GetPseudoStack()->mPrivacyMode = true;
}
}
}
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
if (t->ProfileJava()) {
int javaInterval = aInterval;
// Java sampling doesn't accuratly keep up with 1ms sampling
if (javaInterval < 10) {
aInterval = 10;
}
GeckoJavaSampler::StartJavaProfiling(javaInterval, 1000);
}
#endif
if (t->AddMainThreadIO()) {
if (!sInterposeObserver) {
// Lazily create IO interposer observer
sInterposeObserver = new mozilla::ProfilerIOInterposeObserver();
}
mozilla::IOInterposer::Register(mozilla::IOInterposeObserver::OpAll,
sInterposeObserver);
}
sIsProfiling = true;
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os)
os->NotifyObservers(nullptr, "profiler-started", nullptr);
}
void mozilla_sampler_stop()
{
if (!stack_key_initialized)
profiler_init(nullptr);
TableTicker *t = tlsTicker.get();
if (!t) {
return;
}
bool disableJS = t->ProfileJS();
bool unwinderThreader = t->HasUnwinderThread();
// Shut down and reap the unwinder thread. We have to do this
// before stopping the sampler, so as to guarantee that the unwinder
// thread doesn't try to access memory that the subsequent call to
// mozilla_sampler_stop causes to be freed.
if (unwinderThreader) {
uwt__stop();
}
t->Stop();
delete t;
tlsTicker.set(nullptr);
if (disableJS) {
PseudoStack *stack = tlsPseudoStack.get();
ASSERT(stack != nullptr);
stack->disableJSSampling();
}
if (unwinderThreader) {
uwt__deinit();
}
mozilla::IOInterposer::Unregister(mozilla::IOInterposeObserver::OpAll,
sInterposeObserver);
sIsProfiling = false;
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os)
os->NotifyObservers(nullptr, "profiler-stopped", nullptr);
}
bool mozilla_sampler_is_active()
{
return sIsProfiling;
}
static double sResponsivenessTimes[100];
static unsigned int sResponsivenessLoc = 0;
void mozilla_sampler_responsiveness(const TimeStamp& aTime)
{
if (!sLastTracerEvent.IsNull()) {
if (sResponsivenessLoc == 100) {
for(size_t i = 0; i < 100-1; i++) {
sResponsivenessTimes[i] = sResponsivenessTimes[i+1];
}
sResponsivenessLoc--;
}
TimeDuration delta = aTime - sLastTracerEvent;
sResponsivenessTimes[sResponsivenessLoc++] = delta.ToMilliseconds();
}
sCurrentEventGeneration++;
sLastTracerEvent = aTime;
}
const double* mozilla_sampler_get_responsiveness()
{
return sResponsivenessTimes;
}
void mozilla_sampler_frame_number(int frameNumber)
{
sFrameNumber = frameNumber;
}
void mozilla_sampler_print_location2()
{
// FIXME
}
void mozilla_sampler_lock()
{
profiler_stop();
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os)
os->NotifyObservers(nullptr, "profiler-locked", nullptr);
}
void mozilla_sampler_unlock()
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os)
os->NotifyObservers(nullptr, "profiler-unlocked", nullptr);
}
bool mozilla_sampler_register_thread(const char* aName, void* stackTop)
{
#if defined(MOZ_WIDGET_GONK) && !defined(MOZ_PROFILING)
// The only way to profile secondary threads on b2g
// is to build with profiling OR have the profiler
// running on startup.
if (!profiler_is_active()) {
return false;
}
#endif
PseudoStack* stack = new PseudoStack();
tlsPseudoStack.set(stack);
bool isMainThread = is_main_thread_name(aName);
return Sampler::RegisterCurrentThread(aName, stack, isMainThread, stackTop);
}
void mozilla_sampler_unregister_thread()
{
Sampler::UnregisterCurrentThread();
PseudoStack *stack = tlsPseudoStack.get();
if (!stack) {
return;
}
delete stack;
tlsPseudoStack.set(nullptr);
}
double mozilla_sampler_time(const TimeStamp& aTime)
{
if (!mozilla_sampler_is_active()) {
return 0.0;
}
TimeDuration delta = aTime - sStartTime;
return delta.ToMilliseconds();
}
double mozilla_sampler_time()
{
return mozilla_sampler_time(TimeStamp::Now());
}
ProfilerBacktrace* mozilla_sampler_get_backtrace()
{
if (!stack_key_initialized)
return nullptr;
// Don't capture a stack if we're not profiling
if (!profiler_is_active()) {
return nullptr;
}
// Don't capture a stack if we don't want to include personal information
if (profiler_in_privacy_mode()) {
return nullptr;
}
TableTicker* t = tlsTicker.get();
if (!t) {
return nullptr;
}
return new ProfilerBacktrace(t->GetBacktrace());
}
void mozilla_sampler_free_backtrace(ProfilerBacktrace* aBacktrace)
{
delete aBacktrace;
}
void mozilla_sampler_tracing(const char* aCategory, const char* aInfo,
TracingMetadata aMetaData)
{
mozilla_sampler_add_marker(aInfo, new ProfilerMarkerTracing(aCategory, aMetaData));
}
// END externally visible functions
////////////////////////////////////////////////////////////////////////
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