The Tor Browser: tools/profiler/platform.cpp@97036ab72558 (annotated)

tools/profiler/platform.cpp@97036ab72558 (annotated)

tools/profiler/platform.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* 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 "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,
     float aTime)
   : mMarkerName(strdup(aMarkerName))
   , mPayload(aPayload)
   , mTime(aTime)
 {
 }
 ProfilerMarker::~ProfilerMarker() {
   free(mMarkerName);
   delete mPayload;
 }
 void
 ProfilerMarker::SetGeneration(int aGenID) {
   mGenID = aGenID;
 }
 float
 ProfilerMarker::GetTime() {
   return mTime;
 }
 void ProfilerMarker::StreamJSObject(JSStreamWriter& b) const {
   b.BeginObject();
     b.NameValue("name", GetMarkerName());
     // TODO: Store the callsite for this marker if available:
     // if have location data
     //   b.NameValue(marker, "location", ...);
     if (mPayload) {
       b.Name("data");
       mPayload->StreamPayload(b);
     }
     b.NameValue("time", mTime);
   b.EndObject();
 }
 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;
 }
 /* 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;
 }
 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: Note that MOZ_PROFILER_MODE=help sets all values to defaults.");
     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 LUL-based unwinding.");
   LOG( "SPS: ");
   LOG( "SPS:   MOZ_PROFILER_LUL_TEST");
   LOG( "SPS:   If set to any value, runs LUL unit tests at startup of");
   LOG( "SPS:   the unwinder thread, and prints a short summary of results.");
   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: Note that MOZ_PROFILER_MODE=help sets all values to defaults.");
   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();
   // platform specific initialization
   OS::Startup();
   // 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();
   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);
 }
 void mozilla_sampler_save_profile_to_file(const char* aFilename)
 {
   TableTicker *t = tlsTicker.get();
   if (!t) {
     return;
   }
   std::ofstream stream;
   stream.open(aFilename);
   if (stream.is_open()) {
     t->ToStreamAsJSON(stream);
     stream.close();
     LOGF("Saved to %s", aFilename);
   } else {
     LOG("Fail to open profile log file.");
   }
 }
 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)
 {
   LOG("BEGIN mozilla_sampler_start");
   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;
         }
         thread_profile->GetPseudoStack()->reinitializeOnResume();
         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;
     }
     mozilla::widget::android::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;
   if (Sampler::CanNotifyObservers()) {
     nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
     if (os)
       os->NotifyObservers(nullptr, "profiler-started", nullptr);
   }
   LOG("END   mozilla_sampler_start");
 }
 void mozilla_sampler_stop()
 {
   LOG("BEGIN mozilla_sampler_stop");
   if (!stack_key_initialized)
     profiler_init(nullptr);
   TableTicker *t = tlsTicker.get();
   if (!t) {
     LOG("END   mozilla_sampler_stop-early");
     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);
   sInterposeObserver = nullptr;
   sIsProfiling = false;
   if (Sampler::CanNotifyObservers()) {
     nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
     if (os)
       os->NotifyObservers(nullptr, "profiler-stopped", nullptr);
   }
   LOG("END   mozilla_sampler_stop");
 }
 bool mozilla_sampler_is_paused() {
   if (Sampler::GetActiveSampler()) {
     return Sampler::GetActiveSampler()->IsPaused();
   } else {
     return false;
   }
 }
 void mozilla_sampler_pause() {
   if (Sampler::GetActiveSampler()) {
     Sampler::GetActiveSampler()->SetPaused(true);
   }
 }
 void mozilla_sampler_resume() {
   if (Sampler::GetActiveSampler()) {
     Sampler::GetActiveSampler()->SetPaused(false);
   }
 }
 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);
 }
 void mozilla_sampler_sleep_start() {
     PseudoStack *stack = tlsPseudoStack.get();
     if (stack == nullptr) {
       return;
     }
     stack->setSleeping(1);
 }
 void mozilla_sampler_sleep_end() {
     PseudoStack *stack = tlsPseudoStack.get();
     if (stack == nullptr) {
       return;
     }
     stack->setSleeping(0);
 }
 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));
 }
 void mozilla_sampler_add_marker(const char *aMarker, ProfilerMarkerPayload *aPayload)
 {
   // Note that aPayload may be allocated by the caller, so we need to make sure
   // that we free it at some point.
   nsAutoPtr<ProfilerMarkerPayload> payload(aPayload);
   if (!stack_key_initialized)
     return;
   // Don't insert a marker if we're not profiling to avoid
   // the heap copy (malloc).
   if (!profiler_is_active()) {
     return;
   }
   // Don't add a marker if we don't want to include personal information
   if (profiler_in_privacy_mode()) {
     return;
   }
   PseudoStack *stack = tlsPseudoStack.get();
   if (!stack) {
     return;
   }
   TimeDuration delta = TimeStamp::Now() - sStartTime;
   stack->addMarker(aMarker, payload.forget(), static_cast<float>(delta.ToMilliseconds()));
 }
 // END externally visible functions
 ////////////////////////////////////////////////////////////////////////

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tools/profiler/platform.cpp@97036ab72558 (annotated)

tools/profiler/platform.cpp