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Diffstat (limited to 'tools/profiler/core/GeckoSampler.cpp')
| -rw-r--r-- | tools/profiler/core/GeckoSampler.cpp | 1306 |
1 files changed, 0 insertions, 1306 deletions
diff --git a/tools/profiler/core/GeckoSampler.cpp b/tools/profiler/core/GeckoSampler.cpp deleted file mode 100644 index 4283542f6c..0000000000 --- a/tools/profiler/core/GeckoSampler.cpp +++ /dev/null @@ -1,1306 +0,0 @@ -/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ -/* 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 <algorithm> -#include <string> -#include <stdio.h> -#include <fstream> -#include <sstream> -#include "GeckoProfiler.h" -#ifndef SPS_STANDALONE -#include "SaveProfileTask.h" -#include "nsThreadUtils.h" -#include "prenv.h" -#include "prtime.h" -#include "nsXULAppAPI.h" -#endif -#include "ProfileEntry.h" -#include "SyncProfile.h" -#include "platform.h" -#include "shared-libraries.h" -#include "mozilla/StackWalk.h" -#include "GeckoSampler.h" - -// JSON -#include "ProfileJSONWriter.h" - -#ifndef SPS_STANDALONE -// Meta -#include "nsXPCOM.h" -#include "nsXPCOMCID.h" -#include "nsIHttpProtocolHandler.h" -#include "nsServiceManagerUtils.h" -#include "nsIXULRuntime.h" -#include "nsIXULAppInfo.h" -#include "nsDirectoryServiceUtils.h" -#include "nsDirectoryServiceDefs.h" -#include "nsIObserverService.h" -#include "mozilla/Services.h" -#include "PlatformMacros.h" -#include "nsTArray.h" - -#include "mozilla/ProfileGatherer.h" -#endif - -#if defined(SPS_OS_android) - #include "FennecJNIWrappers.h" -#endif - -#ifndef SPS_STANDALONE -// JS -#include "jsfriendapi.h" -#include "js/ProfilingFrameIterator.h" -#endif - -#if defined(MOZ_PROFILING) && (defined(XP_MACOSX) || defined(XP_WIN)) - #define USE_NS_STACKWALK -#endif - -#if defined(XP_WIN) -typedef CONTEXT tickcontext_t; -#elif defined(LINUX) -#include <ucontext.h> -typedef ucontext_t tickcontext_t; -#endif - -#if defined(LINUX) || defined(XP_MACOSX) -#include <sys/types.h> -pid_t gettid(); -#endif - -#if defined(__arm__) && defined(ANDROID) - // Should also work on ARM Linux, but not tested there yet. - #define USE_EHABI_STACKWALK -#endif -#ifdef USE_EHABI_STACKWALK - #include "EHABIStackWalk.h" -#endif - -#ifndef SPS_STANDALONE -#if defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_x86_linux) -# define USE_LUL_STACKWALK -# include "lul/LulMain.h" -# include "lul/platform-linux-lul.h" -#endif -#endif - -using std::string; -using namespace mozilla; - -#ifndef MAXPATHLEN - #ifdef PATH_MAX - #define MAXPATHLEN PATH_MAX - #elif defined(MAX_PATH) - #define MAXPATHLEN MAX_PATH - #elif defined(_MAX_PATH) - #define MAXPATHLEN _MAX_PATH - #elif defined(CCHMAXPATH) - #define MAXPATHLEN CCHMAXPATH - #else - #define MAXPATHLEN 1024 - #endif -#endif - -#ifdef MOZ_VALGRIND -# include <valgrind/memcheck.h> -#else -# define VALGRIND_MAKE_MEM_DEFINED(_addr,_len) ((void)0) -#endif - - -/////////////////////////////////////////////////////////////////////// -// BEGIN SaveProfileTask et al - -static void -AddSharedLibraryInfoToStream(std::ostream& aStream, const SharedLibrary& aLib) -{ - aStream << "{"; - aStream << "\"start\":" << aLib.GetStart(); - aStream << ",\"end\":" << aLib.GetEnd(); - aStream << ",\"offset\":" << aLib.GetOffset(); - aStream << ",\"name\":\"" << aLib.GetName() << "\""; - const std::string &breakpadId = aLib.GetBreakpadId(); - aStream << ",\"breakpadId\":\"" << breakpadId << "\""; -#ifdef XP_WIN - // FIXME: remove this XP_WIN code when the profiler plugin has switched to - // using breakpadId. - std::string pdbSignature = breakpadId.substr(0, 32); - std::string pdbAgeStr = breakpadId.substr(32, breakpadId.size() - 1); - - std::stringstream stream; - stream << pdbAgeStr; - - unsigned pdbAge; - stream << std::hex; - stream >> pdbAge; - -#ifdef DEBUG - std::ostringstream oStream; - oStream << pdbSignature << std::hex << std::uppercase << pdbAge; - MOZ_ASSERT(breakpadId == oStream.str()); -#endif - - aStream << ",\"pdbSignature\":\"" << pdbSignature << "\""; - aStream << ",\"pdbAge\":" << pdbAge; - aStream << ",\"pdbName\":\"" << aLib.GetName() << "\""; -#endif - aStream << "}"; -} - -std::string -GetSharedLibraryInfoStringInternal() -{ - SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf(); - if (info.GetSize() == 0) - return "[]"; - - std::ostringstream os; - os << "["; - AddSharedLibraryInfoToStream(os, info.GetEntry(0)); - - for (size_t i = 1; i < info.GetSize(); i++) { - os << ","; - AddSharedLibraryInfoToStream(os, info.GetEntry(i)); - } - - os << "]"; - return os.str(); -} - -static bool -hasFeature(const char** aFeatures, uint32_t aFeatureCount, const char* aFeature) { - for(size_t i = 0; i < aFeatureCount; i++) { - if (strcmp(aFeatures[i], aFeature) == 0) - return true; - } - return false; -} - -GeckoSampler::GeckoSampler(double aInterval, int aEntrySize, - const char** aFeatures, uint32_t aFeatureCount, - const char** aThreadNameFilters, uint32_t aFilterCount) - : Sampler(aInterval, true, aEntrySize) - , mPrimaryThreadProfile(nullptr) - , mBuffer(new ProfileBuffer(aEntrySize)) - , mSaveRequested(false) -#if defined(XP_WIN) - , mIntelPowerGadget(nullptr) -#endif -{ - mUseStackWalk = hasFeature(aFeatures, aFeatureCount, "stackwalk"); - - mProfileJS = hasFeature(aFeatures, aFeatureCount, "js"); - mProfileGPU = hasFeature(aFeatures, aFeatureCount, "gpu"); - mProfilePower = hasFeature(aFeatures, aFeatureCount, "power"); - // Users sometimes ask to filter by a list of threads but forget to request - // profiling non main threads. Let's make it implificit if we have a filter - mProfileThreads = hasFeature(aFeatures, aFeatureCount, "threads") || aFilterCount > 0; - mAddLeafAddresses = hasFeature(aFeatures, aFeatureCount, "leaf"); - mPrivacyMode = hasFeature(aFeatures, aFeatureCount, "privacy"); - mAddMainThreadIO = hasFeature(aFeatures, aFeatureCount, "mainthreadio"); - mProfileMemory = hasFeature(aFeatures, aFeatureCount, "memory"); - mTaskTracer = hasFeature(aFeatures, aFeatureCount, "tasktracer"); - mLayersDump = hasFeature(aFeatures, aFeatureCount, "layersdump"); - mDisplayListDump = hasFeature(aFeatures, aFeatureCount, "displaylistdump"); - mProfileRestyle = hasFeature(aFeatures, aFeatureCount, "restyle"); - -#if defined(XP_WIN) - if (mProfilePower) { - mIntelPowerGadget = new IntelPowerGadget(); - mProfilePower = mIntelPowerGadget->Init(); - } -#endif - -#if defined(SPS_OS_android) - mProfileJava = mozilla::jni::IsFennec() && - hasFeature(aFeatures, aFeatureCount, "java"); -#else - mProfileJava = false; -#endif - - // Deep copy aThreadNameFilters - MOZ_ALWAYS_TRUE(mThreadNameFilters.resize(aFilterCount)); - for (uint32_t i = 0; i < aFilterCount; ++i) { - mThreadNameFilters[i] = aThreadNameFilters[i]; - } - - // Deep copy aFeatures - MOZ_ALWAYS_TRUE(mFeatures.resize(aFeatureCount)); - for (uint32_t i = 0; i < aFeatureCount; ++i) { - mFeatures[i] = aFeatures[i]; - } - - bool ignore; - sStartTime = mozilla::TimeStamp::ProcessCreation(ignore); - - { - ::MutexAutoLock lock(*sRegisteredThreadsMutex); - - // Create ThreadProfile for each registered thread - for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) { - ThreadInfo* info = sRegisteredThreads->at(i); - - RegisterThread(info); - } - - SetActiveSampler(this); - } - -#ifdef MOZ_TASK_TRACER - if (mTaskTracer) { - mozilla::tasktracer::StartLogging(); - } -#endif - - mGatherer = new mozilla::ProfileGatherer(this); -} - -GeckoSampler::~GeckoSampler() -{ - if (IsActive()) - Stop(); - - SetActiveSampler(nullptr); - - // Destroy ThreadProfile for all threads - { - ::MutexAutoLock lock(*sRegisteredThreadsMutex); - - for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) { - ThreadInfo* info = sRegisteredThreads->at(i); - ThreadProfile* profile = info->Profile(); - if (profile) { - delete profile; - info->SetProfile(nullptr); - } - // We've stopped profiling. We no longer need to retain - // information for an old thread. - if (info->IsPendingDelete()) { - delete info; - sRegisteredThreads->erase(sRegisteredThreads->begin() + i); - i--; - } - } - } -#if defined(XP_WIN) - delete mIntelPowerGadget; -#endif - - // Cancel any in-flight async profile gatherering - // requests - mGatherer->Cancel(); -} - -void GeckoSampler::HandleSaveRequest() -{ - if (!mSaveRequested) - return; - mSaveRequested = false; - -#ifndef SPS_STANDALONE - // TODO: Use use the ipc/chromium Tasks here to support processes - // without XPCOM. - nsCOMPtr<nsIRunnable> runnable = new SaveProfileTask(); - NS_DispatchToMainThread(runnable); -#endif -} - -void GeckoSampler::DeleteExpiredMarkers() -{ - mBuffer->deleteExpiredStoredMarkers(); -} - -void GeckoSampler::StreamTaskTracer(SpliceableJSONWriter& aWriter) -{ -#ifdef MOZ_TASK_TRACER - aWriter.StartArrayProperty("data"); - UniquePtr<nsTArray<nsCString>> data = mozilla::tasktracer::GetLoggedData(sStartTime); - for (uint32_t i = 0; i < data->Length(); ++i) { - aWriter.StringElement((data->ElementAt(i)).get()); - } - aWriter.EndArray(); - - aWriter.StartArrayProperty("threads"); - ::MutexAutoLock lock(*sRegisteredThreadsMutex); - for (size_t i = 0; i < sRegisteredThreads->size(); i++) { - // Thread meta data - ThreadInfo* info = sRegisteredThreads->at(i); - aWriter.StartObjectElement(); - if (XRE_GetProcessType() == GeckoProcessType_Plugin) { - // TODO Add the proper plugin name - aWriter.StringProperty("name", "Plugin"); - } else { - aWriter.StringProperty("name", info->Name()); - } - aWriter.IntProperty("tid", static_cast<int>(info->ThreadId())); - aWriter.EndObject(); - } - aWriter.EndArray(); - - aWriter.DoubleProperty("start", static_cast<double>(mozilla::tasktracer::GetStartTime())); -#endif -} - - -void GeckoSampler::StreamMetaJSCustomObject(SpliceableJSONWriter& aWriter) -{ - aWriter.IntProperty("version", 3); - aWriter.DoubleProperty("interval", interval()); - aWriter.IntProperty("stackwalk", mUseStackWalk); - -#ifndef SPS_STANDALONE - mozilla::TimeDuration delta = mozilla::TimeStamp::Now() - sStartTime; - aWriter.DoubleProperty("startTime", static_cast<double>(PR_Now()/1000.0 - delta.ToMilliseconds())); - - aWriter.IntProperty("processType", XRE_GetProcessType()); - - nsresult res; - nsCOMPtr<nsIHttpProtocolHandler> http = do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &res); - if (!NS_FAILED(res)) { - nsAutoCString string; - - res = http->GetPlatform(string); - if (!NS_FAILED(res)) - aWriter.StringProperty("platform", string.Data()); - - res = http->GetOscpu(string); - if (!NS_FAILED(res)) - aWriter.StringProperty("oscpu", string.Data()); - - res = http->GetMisc(string); - if (!NS_FAILED(res)) - aWriter.StringProperty("misc", string.Data()); - } - - nsCOMPtr<nsIXULRuntime> runtime = do_GetService("@mozilla.org/xre/runtime;1"); - if (runtime) { - nsAutoCString string; - - res = runtime->GetXPCOMABI(string); - if (!NS_FAILED(res)) - aWriter.StringProperty("abi", string.Data()); - - res = runtime->GetWidgetToolkit(string); - if (!NS_FAILED(res)) - aWriter.StringProperty("toolkit", string.Data()); - } - - nsCOMPtr<nsIXULAppInfo> appInfo = do_GetService("@mozilla.org/xre/app-info;1"); - if (appInfo) { - nsAutoCString string; - - res = appInfo->GetName(string); - if (!NS_FAILED(res)) - aWriter.StringProperty("product", string.Data()); - } -#endif -} - -void GeckoSampler::ToStreamAsJSON(std::ostream& stream, double aSinceTime) -{ - SpliceableJSONWriter b(mozilla::MakeUnique<OStreamJSONWriteFunc>(stream)); - StreamJSON(b, aSinceTime); -} - -#ifndef SPS_STANDALONE -JSObject* GeckoSampler::ToJSObject(JSContext *aCx, double aSinceTime) -{ - JS::RootedValue val(aCx); - { - UniquePtr<char[]> buf = ToJSON(aSinceTime); - NS_ConvertUTF8toUTF16 js_string(nsDependentCString(buf.get())); - MOZ_ALWAYS_TRUE(JS_ParseJSON(aCx, static_cast<const char16_t*>(js_string.get()), - js_string.Length(), &val)); - } - return &val.toObject(); -} - -void GeckoSampler::GetGatherer(nsISupports** aRetVal) -{ - if (!aRetVal || NS_WARN_IF(!mGatherer)) { - return; - } - NS_ADDREF(*aRetVal = mGatherer); -} -#endif - -UniquePtr<char[]> GeckoSampler::ToJSON(double aSinceTime) -{ - SpliceableChunkedJSONWriter b; - StreamJSON(b, aSinceTime); - return b.WriteFunc()->CopyData(); -} - -void GeckoSampler::ToJSObjectAsync(double aSinceTime, - mozilla::dom::Promise* aPromise) -{ - if (NS_WARN_IF(!mGatherer)) { - return; - } - - mGatherer->Start(aSinceTime, aPromise); -} - -struct SubprocessClosure { - explicit SubprocessClosure(SpliceableJSONWriter* aWriter) - : mWriter(aWriter) - {} - - SpliceableJSONWriter* mWriter; -}; - -void SubProcessCallback(const char* aProfile, void* aClosure) -{ - // Called by the observer to get their profile data included - // as a sub profile - SubprocessClosure* closure = (SubprocessClosure*)aClosure; - - // Add the string profile into the profile - closure->mWriter->StringElement(aProfile); -} - - -#if defined(SPS_OS_android) -static -void BuildJavaThreadJSObject(SpliceableJSONWriter& aWriter) -{ - aWriter.StringProperty("name", "Java Main Thread"); - - aWriter.StartArrayProperty("samples"); - - // for each sample - for (int sampleId = 0; true; sampleId++) { - bool firstRun = true; - // for each frame - for (int frameId = 0; true; frameId++) { - jni::String::LocalRef frameName = - java::GeckoJavaSampler::GetFrameName(0, sampleId, frameId); - // when we run out of frames, we stop looping - if (!frameName) { - // if we found at least one frame, we have objects to close - if (!firstRun) { - aWriter.EndArray(); - aWriter.EndObject(); - } - break; - } - // the first time around, open the sample object and frames array - if (firstRun) { - firstRun = false; - - double sampleTime = - java::GeckoJavaSampler::GetSampleTime(0, sampleId); - - aWriter.StartObjectElement(); - aWriter.DoubleProperty("time", sampleTime); - - aWriter.StartArrayProperty("frames"); - } - // add a frame to the sample - aWriter.StartObjectElement(); - aWriter.StringProperty("location", - frameName->ToCString().BeginReading()); - aWriter.EndObject(); - } - // if we found no frames for this sample, we are done - if (firstRun) { - break; - } - } - - aWriter.EndArray(); -} -#endif - -void GeckoSampler::StreamJSON(SpliceableJSONWriter& aWriter, double aSinceTime) -{ - aWriter.Start(SpliceableJSONWriter::SingleLineStyle); - { - // Put shared library info - aWriter.StringProperty("libs", GetSharedLibraryInfoStringInternal().c_str()); - - // Put meta data - aWriter.StartObjectProperty("meta"); - StreamMetaJSCustomObject(aWriter); - aWriter.EndObject(); - - // Data of TaskTracer doesn't belong in the circular buffer. - if (TaskTracer()) { - aWriter.StartObjectProperty("tasktracer"); - StreamTaskTracer(aWriter); - aWriter.EndObject(); - } - - // Lists the samples for each ThreadProfile - aWriter.StartArrayProperty("threads"); - { - SetPaused(true); - - { - ::MutexAutoLock lock(*sRegisteredThreadsMutex); - - for (size_t i = 0; i < sRegisteredThreads->size(); i++) { - // Thread not being profiled, skip it - if (!sRegisteredThreads->at(i)->Profile()) - continue; - - // Note that we intentionally include ThreadProfile which - // have been marked for pending delete. - - ::MutexAutoLock lock(sRegisteredThreads->at(i)->Profile()->GetMutex()); - - sRegisteredThreads->at(i)->Profile()->StreamJSON(aWriter, aSinceTime); - } - } - -#ifndef SPS_STANDALONE - if (Sampler::CanNotifyObservers()) { - // Send a event asking any subprocesses (plugins) to - // give us their information - SubprocessClosure closure(&aWriter); - nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); - if (os) { - RefPtr<ProfileSaveEvent> pse = new ProfileSaveEvent(SubProcessCallback, &closure); - os->NotifyObservers(pse, "profiler-subprocess", nullptr); - } - } - - #if defined(SPS_OS_android) - if (ProfileJava()) { - java::GeckoJavaSampler::Pause(); - - aWriter.Start(); - { - BuildJavaThreadJSObject(aWriter); - } - aWriter.End(); - - java::GeckoJavaSampler::Unpause(); - } - #endif -#endif - - SetPaused(false); - } - aWriter.EndArray(); - } - aWriter.End(); -} - -void GeckoSampler::FlushOnJSShutdown(JSContext* aContext) -{ -#ifndef SPS_STANDALONE - SetPaused(true); - - { - ::MutexAutoLock lock(*sRegisteredThreadsMutex); - - for (size_t i = 0; i < sRegisteredThreads->size(); i++) { - // Thread not being profiled, skip it. - if (!sRegisteredThreads->at(i)->Profile() || - sRegisteredThreads->at(i)->IsPendingDelete()) { - continue; - } - - // Thread not profiling the context that's going away, skip it. - if (sRegisteredThreads->at(i)->Profile()->GetPseudoStack()->mContext != aContext) { - continue; - } - - ::MutexAutoLock lock(sRegisteredThreads->at(i)->Profile()->GetMutex()); - sRegisteredThreads->at(i)->Profile()->FlushSamplesAndMarkers(); - } - } - - SetPaused(false); -#endif -} - -void PseudoStack::flushSamplerOnJSShutdown() -{ -#ifndef SPS_STANDALONE - MOZ_ASSERT(mContext); - GeckoSampler* t = tlsTicker.get(); - if (t) { - t->FlushOnJSShutdown(mContext); - } -#endif -} - -// END SaveProfileTask et al -//////////////////////////////////////////////////////////////////////// - -static -void addDynamicTag(ThreadProfile &aProfile, char aTagName, const char *aStr) -{ - aProfile.addTag(ProfileEntry(aTagName, "")); - // Add one to store the null termination - size_t strLen = strlen(aStr) + 1; - for (size_t j = 0; j < strLen;) { - // Store as many characters in the void* as the platform allows - char text[sizeof(void*)]; - size_t len = sizeof(void*)/sizeof(char); - if (j+len >= strLen) { - len = strLen - j; - } - memcpy(text, &aStr[j], len); - j += sizeof(void*)/sizeof(char); - // Cast to *((void**) to pass the text data to a void* - aProfile.addTag(ProfileEntry('d', *((void**)(&text[0])))); - } -} - -static -void addPseudoEntry(volatile StackEntry &entry, ThreadProfile &aProfile, - PseudoStack *stack, void *lastpc) -{ - // Pseudo-frames with the BEGIN_PSEUDO_JS flag are just annotations - // and should not be recorded in the profile. - if (entry.hasFlag(StackEntry::BEGIN_PSEUDO_JS)) - return; - - int lineno = -1; - - // First entry has tagName 's' (start) - // Check for magic pointer bit 1 to indicate copy - const char* sampleLabel = entry.label(); - if (entry.isCopyLabel()) { - // Store the string using 1 or more 'd' (dynamic) tags - // that will happen to the preceding tag - - addDynamicTag(aProfile, 'c', sampleLabel); -#ifndef SPS_STANDALONE - if (entry.isJs()) { - JSScript* script = entry.script(); - if (script) { - if (!entry.pc()) { - // The JIT only allows the top-most entry to have a nullptr pc - MOZ_ASSERT(&entry == &stack->mStack[stack->stackSize() - 1]); - // If stack-walking was disabled, then that's just unfortunate - if (lastpc) { - jsbytecode *jspc = js::ProfilingGetPC(stack->mContext, script, - lastpc); - if (jspc) { - lineno = JS_PCToLineNumber(script, jspc); - } - } - } else { - lineno = JS_PCToLineNumber(script, entry.pc()); - } - } - } else { - lineno = entry.line(); - } -#endif - } else { - aProfile.addTag(ProfileEntry('c', sampleLabel)); - - // XXX: Bug 1010578. Don't assume a CPP entry and try to get the - // line for js entries as well. - if (entry.isCpp()) { - lineno = entry.line(); - } - } - - if (lineno != -1) { - aProfile.addTag(ProfileEntry('n', lineno)); - } - - uint32_t category = entry.category(); - MOZ_ASSERT(!(category & StackEntry::IS_CPP_ENTRY)); - MOZ_ASSERT(!(category & StackEntry::FRAME_LABEL_COPY)); - - if (category) { - aProfile.addTag(ProfileEntry('y', (int)category)); - } -} - -struct NativeStack -{ - void** pc_array; - void** sp_array; - size_t size; - size_t count; -}; - -mozilla::Atomic<bool> WALKING_JS_STACK(false); - -struct AutoWalkJSStack { - bool walkAllowed; - - AutoWalkJSStack() : walkAllowed(false) { - walkAllowed = WALKING_JS_STACK.compareExchange(false, true); - } - - ~AutoWalkJSStack() { - if (walkAllowed) - WALKING_JS_STACK = false; - } -}; - -static -void mergeStacksIntoProfile(ThreadProfile& aProfile, TickSample* aSample, NativeStack& aNativeStack) -{ - PseudoStack* pseudoStack = aProfile.GetPseudoStack(); - volatile StackEntry *pseudoFrames = pseudoStack->mStack; - uint32_t pseudoCount = pseudoStack->stackSize(); - - // Make a copy of the JS stack into a JSFrame array. This is necessary since, - // like the native stack, the JS stack is iterated youngest-to-oldest and we - // need to iterate oldest-to-youngest when adding entries to aProfile. - - // Synchronous sampling reports an invalid buffer generation to - // ProfilingFrameIterator to avoid incorrectly resetting the generation of - // sampled JIT entries inside the JS engine. See note below concerning 'J' - // entries. - uint32_t startBufferGen; - if (aSample->isSamplingCurrentThread) { - startBufferGen = UINT32_MAX; - } else { - startBufferGen = aProfile.bufferGeneration(); - } - uint32_t jsCount = 0; -#ifndef SPS_STANDALONE - JS::ProfilingFrameIterator::Frame jsFrames[1000]; - // Only walk jit stack if profiling frame iterator is turned on. - if (pseudoStack->mContext && JS::IsProfilingEnabledForContext(pseudoStack->mContext)) { - AutoWalkJSStack autoWalkJSStack; - const uint32_t maxFrames = mozilla::ArrayLength(jsFrames); - - if (aSample && autoWalkJSStack.walkAllowed) { - JS::ProfilingFrameIterator::RegisterState registerState; - registerState.pc = aSample->pc; - registerState.sp = aSample->sp; -#ifdef ENABLE_ARM_LR_SAVING - registerState.lr = aSample->lr; -#endif - - JS::ProfilingFrameIterator jsIter(pseudoStack->mContext, - registerState, - startBufferGen); - for (; jsCount < maxFrames && !jsIter.done(); ++jsIter) { - // See note below regarding 'J' entries. - if (aSample->isSamplingCurrentThread || jsIter.isWasm()) { - uint32_t extracted = jsIter.extractStack(jsFrames, jsCount, maxFrames); - jsCount += extracted; - if (jsCount == maxFrames) - break; - } else { - mozilla::Maybe<JS::ProfilingFrameIterator::Frame> frame = - jsIter.getPhysicalFrameWithoutLabel(); - if (frame.isSome()) - jsFrames[jsCount++] = mozilla::Move(frame.ref()); - } - } - } - } -#endif - - // Start the sample with a root entry. - aProfile.addTag(ProfileEntry('s', "(root)")); - - // While the pseudo-stack array is ordered oldest-to-youngest, the JS and - // native arrays are ordered youngest-to-oldest. We must add frames to - // aProfile oldest-to-youngest. Thus, iterate over the pseudo-stack forwards - // and JS and native arrays backwards. Note: this means the terminating - // condition jsIndex and nativeIndex is being < 0. - uint32_t pseudoIndex = 0; - int32_t jsIndex = jsCount - 1; - int32_t nativeIndex = aNativeStack.count - 1; - - uint8_t *lastPseudoCppStackAddr = nullptr; - - // Iterate as long as there is at least one frame remaining. - while (pseudoIndex != pseudoCount || jsIndex >= 0 || nativeIndex >= 0) { - // There are 1 to 3 frames available. Find and add the oldest. - - uint8_t *pseudoStackAddr = nullptr; - uint8_t *jsStackAddr = nullptr; - uint8_t *nativeStackAddr = nullptr; - - if (pseudoIndex != pseudoCount) { - volatile StackEntry &pseudoFrame = pseudoFrames[pseudoIndex]; - - if (pseudoFrame.isCpp()) - lastPseudoCppStackAddr = (uint8_t *) pseudoFrame.stackAddress(); - -#ifndef SPS_STANDALONE - // Skip any pseudo-stack JS frames which are marked isOSR - // Pseudostack frames are marked isOSR when the JS interpreter - // enters a jit frame on a loop edge (via on-stack-replacement, - // or OSR). To avoid both the pseudoframe and jit frame being - // recorded (and showing up twice), the interpreter marks the - // interpreter pseudostack entry with the OSR flag to ensure that - // it doesn't get counted. - if (pseudoFrame.isJs() && pseudoFrame.isOSR()) { - pseudoIndex++; - continue; - } -#endif - - MOZ_ASSERT(lastPseudoCppStackAddr); - pseudoStackAddr = lastPseudoCppStackAddr; - } - -#ifndef SPS_STANDALONE - if (jsIndex >= 0) - jsStackAddr = (uint8_t *) jsFrames[jsIndex].stackAddress; -#endif - - if (nativeIndex >= 0) - nativeStackAddr = (uint8_t *) aNativeStack.sp_array[nativeIndex]; - - // If there's a native stack entry which has the same SP as a - // pseudo stack entry, pretend we didn't see the native stack - // entry. Ditto for a native stack entry which has the same SP as - // a JS stack entry. In effect this means pseudo or JS entries - // trump conflicting native entries. - if (nativeStackAddr && (pseudoStackAddr == nativeStackAddr || jsStackAddr == nativeStackAddr)) { - nativeStackAddr = nullptr; - nativeIndex--; - MOZ_ASSERT(pseudoStackAddr || jsStackAddr); - } - - // Sanity checks. - MOZ_ASSERT_IF(pseudoStackAddr, pseudoStackAddr != jsStackAddr && - pseudoStackAddr != nativeStackAddr); - MOZ_ASSERT_IF(jsStackAddr, jsStackAddr != pseudoStackAddr && - jsStackAddr != nativeStackAddr); - MOZ_ASSERT_IF(nativeStackAddr, nativeStackAddr != pseudoStackAddr && - nativeStackAddr != jsStackAddr); - - // Check to see if pseudoStack frame is top-most. - if (pseudoStackAddr > jsStackAddr && pseudoStackAddr > nativeStackAddr) { - MOZ_ASSERT(pseudoIndex < pseudoCount); - volatile StackEntry &pseudoFrame = pseudoFrames[pseudoIndex]; - addPseudoEntry(pseudoFrame, aProfile, pseudoStack, nullptr); - pseudoIndex++; - continue; - } - -#ifndef SPS_STANDALONE - // Check to see if JS jit stack frame is top-most - if (jsStackAddr > nativeStackAddr) { - MOZ_ASSERT(jsIndex >= 0); - const JS::ProfilingFrameIterator::Frame& jsFrame = jsFrames[jsIndex]; - - // Stringifying non-wasm JIT frames is delayed until streaming - // time. To re-lookup the entry in the JitcodeGlobalTable, we need to - // store the JIT code address ('J') in the circular buffer. - // - // Note that we cannot do this when we are sychronously sampling the - // current thread; that is, when called from profiler_get_backtrace. The - // captured backtrace is usually externally stored for an indeterminate - // amount of time, such as in nsRefreshDriver. Problematically, the - // stored backtrace may be alive across a GC during which the profiler - // itself is disabled. In that case, the JS engine is free to discard - // its JIT code. This means that if we inserted such 'J' entries into - // the buffer, nsRefreshDriver would now be holding on to a backtrace - // with stale JIT code return addresses. - if (aSample->isSamplingCurrentThread || - jsFrame.kind == JS::ProfilingFrameIterator::Frame_Wasm) { - addDynamicTag(aProfile, 'c', jsFrame.label.get()); - } else { - MOZ_ASSERT(jsFrame.kind == JS::ProfilingFrameIterator::Frame_Ion || - jsFrame.kind == JS::ProfilingFrameIterator::Frame_Baseline); - aProfile.addTag(ProfileEntry('J', jsFrames[jsIndex].returnAddress)); - } - - jsIndex--; - continue; - } -#endif - - // If we reach here, there must be a native stack entry and it must be the - // greatest entry. - if (nativeStackAddr) { - MOZ_ASSERT(nativeIndex >= 0); - aProfile - .addTag(ProfileEntry('l', (void*)aNativeStack.pc_array[nativeIndex])); - } - if (nativeIndex >= 0) { - nativeIndex--; - } - } - -#ifndef SPS_STANDALONE - // Update the JS context with the current profile sample buffer generation. - // - // Do not do this for synchronous sampling, which create their own - // ProfileBuffers. - if (!aSample->isSamplingCurrentThread && pseudoStack->mContext) { - MOZ_ASSERT(aProfile.bufferGeneration() >= startBufferGen); - uint32_t lapCount = aProfile.bufferGeneration() - startBufferGen; - JS::UpdateJSContextProfilerSampleBufferGen(pseudoStack->mContext, - aProfile.bufferGeneration(), - lapCount); - } -#endif -} - -#ifdef USE_NS_STACKWALK -static -void StackWalkCallback(uint32_t aFrameNumber, void* aPC, void* aSP, - void* aClosure) -{ - NativeStack* nativeStack = static_cast<NativeStack*>(aClosure); - MOZ_ASSERT(nativeStack->count < nativeStack->size); - nativeStack->sp_array[nativeStack->count] = aSP; - nativeStack->pc_array[nativeStack->count] = aPC; - nativeStack->count++; -} - -void GeckoSampler::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample) -{ - void* pc_array[1000]; - void* sp_array[1000]; - NativeStack nativeStack = { - pc_array, - sp_array, - mozilla::ArrayLength(pc_array), - 0 - }; - - // Start with the current function. We use 0 as the frame number here because - // the FramePointerStackWalk() and MozStackWalk() calls below will use 1..N. - // This is a bit weird but it doesn't matter because StackWalkCallback() - // doesn't use the frame number argument. - StackWalkCallback(/* frameNumber */ 0, aSample->pc, aSample->sp, &nativeStack); - - uint32_t maxFrames = uint32_t(nativeStack.size - nativeStack.count); - // win X64 doesn't support disabling frame pointers emission so we need - // to fallback to using StackWalk64 which is slower. -#if defined(XP_MACOSX) || (defined(XP_WIN) && !defined(V8_HOST_ARCH_X64)) - void *stackEnd = aSample->threadProfile->GetStackTop(); - bool rv = true; - if (aSample->fp >= aSample->sp && aSample->fp <= stackEnd) - rv = FramePointerStackWalk(StackWalkCallback, /* skipFrames */ 0, - maxFrames, &nativeStack, - reinterpret_cast<void**>(aSample->fp), stackEnd); -#else - void *platformData = nullptr; - - uintptr_t thread = GetThreadHandle(aSample->threadProfile->GetPlatformData()); - MOZ_ASSERT(thread); - bool rv = MozStackWalk(StackWalkCallback, /* skipFrames */ 0, maxFrames, - &nativeStack, thread, platformData); -#endif - if (rv) - mergeStacksIntoProfile(aProfile, aSample, nativeStack); -} -#endif - - -#ifdef USE_EHABI_STACKWALK -void GeckoSampler::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample) -{ - void *pc_array[1000]; - void *sp_array[1000]; - NativeStack nativeStack = { - pc_array, - sp_array, - mozilla::ArrayLength(pc_array), - 0 - }; - - const mcontext_t *mcontext = &reinterpret_cast<ucontext_t *>(aSample->context)->uc_mcontext; - mcontext_t savedContext; - PseudoStack *pseudoStack = aProfile.GetPseudoStack(); - - nativeStack.count = 0; - // The pseudostack contains an "EnterJIT" frame whenever we enter - // JIT code with profiling enabled; the stack pointer value points - // the saved registers. We use this to unwind resume unwinding - // after encounting JIT code. - for (uint32_t i = pseudoStack->stackSize(); i > 0; --i) { - // The pseudostack grows towards higher indices, so we iterate - // backwards (from callee to caller). - volatile StackEntry &entry = pseudoStack->mStack[i - 1]; - if (!entry.isJs() && strcmp(entry.label(), "EnterJIT") == 0) { - // Found JIT entry frame. Unwind up to that point (i.e., force - // the stack walk to stop before the block of saved registers; - // note that it yields nondecreasing stack pointers), then restore - // the saved state. - uint32_t *vSP = reinterpret_cast<uint32_t*>(entry.stackAddress()); - - nativeStack.count += EHABIStackWalk(*mcontext, - /* stackBase = */ vSP, - sp_array + nativeStack.count, - pc_array + nativeStack.count, - nativeStack.size - nativeStack.count); - - memset(&savedContext, 0, sizeof(savedContext)); - // See also: struct EnterJITStack in js/src/jit/arm/Trampoline-arm.cpp - savedContext.arm_r4 = *vSP++; - savedContext.arm_r5 = *vSP++; - savedContext.arm_r6 = *vSP++; - savedContext.arm_r7 = *vSP++; - savedContext.arm_r8 = *vSP++; - savedContext.arm_r9 = *vSP++; - savedContext.arm_r10 = *vSP++; - savedContext.arm_fp = *vSP++; - savedContext.arm_lr = *vSP++; - savedContext.arm_sp = reinterpret_cast<uint32_t>(vSP); - savedContext.arm_pc = savedContext.arm_lr; - mcontext = &savedContext; - } - } - - // Now unwind whatever's left (starting from either the last EnterJIT - // frame or, if no EnterJIT was found, the original registers). - nativeStack.count += EHABIStackWalk(*mcontext, - aProfile.GetStackTop(), - sp_array + nativeStack.count, - pc_array + nativeStack.count, - nativeStack.size - nativeStack.count); - - mergeStacksIntoProfile(aProfile, aSample, nativeStack); -} -#endif - - -#ifdef USE_LUL_STACKWALK -void GeckoSampler::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample) -{ - const mcontext_t* mc - = &reinterpret_cast<ucontext_t *>(aSample->context)->uc_mcontext; - - lul::UnwindRegs startRegs; - memset(&startRegs, 0, sizeof(startRegs)); - -# if defined(SPS_PLAT_amd64_linux) - startRegs.xip = lul::TaggedUWord(mc->gregs[REG_RIP]); - startRegs.xsp = lul::TaggedUWord(mc->gregs[REG_RSP]); - startRegs.xbp = lul::TaggedUWord(mc->gregs[REG_RBP]); -# elif defined(SPS_PLAT_arm_android) - startRegs.r15 = lul::TaggedUWord(mc->arm_pc); - startRegs.r14 = lul::TaggedUWord(mc->arm_lr); - startRegs.r13 = lul::TaggedUWord(mc->arm_sp); - startRegs.r12 = lul::TaggedUWord(mc->arm_ip); - startRegs.r11 = lul::TaggedUWord(mc->arm_fp); - startRegs.r7 = lul::TaggedUWord(mc->arm_r7); -# elif defined(SPS_PLAT_x86_linux) || defined(SPS_PLAT_x86_android) - startRegs.xip = lul::TaggedUWord(mc->gregs[REG_EIP]); - startRegs.xsp = lul::TaggedUWord(mc->gregs[REG_ESP]); - startRegs.xbp = lul::TaggedUWord(mc->gregs[REG_EBP]); -# else -# error "Unknown plat" -# endif - - /* Copy up to N_STACK_BYTES from rsp-REDZONE upwards, but not - going past the stack's registered top point. Do some basic - sanity checks too. This assumes that the TaggedUWord holding - the stack pointer value is valid, but it should be, since it - was constructed that way in the code just above. */ - - lul::StackImage stackImg; - - { -# if defined(SPS_PLAT_amd64_linux) - uintptr_t rEDZONE_SIZE = 128; - uintptr_t start = startRegs.xsp.Value() - rEDZONE_SIZE; -# elif defined(SPS_PLAT_arm_android) - uintptr_t rEDZONE_SIZE = 0; - uintptr_t start = startRegs.r13.Value() - rEDZONE_SIZE; -# elif defined(SPS_PLAT_x86_linux) || defined(SPS_PLAT_x86_android) - uintptr_t rEDZONE_SIZE = 0; - uintptr_t start = startRegs.xsp.Value() - rEDZONE_SIZE; -# else -# error "Unknown plat" -# endif - uintptr_t end = reinterpret_cast<uintptr_t>(aProfile.GetStackTop()); - uintptr_t ws = sizeof(void*); - start &= ~(ws-1); - end &= ~(ws-1); - uintptr_t nToCopy = 0; - if (start < end) { - nToCopy = end - start; - if (nToCopy > lul::N_STACK_BYTES) - nToCopy = lul::N_STACK_BYTES; - } - MOZ_ASSERT(nToCopy <= lul::N_STACK_BYTES); - stackImg.mLen = nToCopy; - stackImg.mStartAvma = start; - if (nToCopy > 0) { - memcpy(&stackImg.mContents[0], (void*)start, nToCopy); - (void)VALGRIND_MAKE_MEM_DEFINED(&stackImg.mContents[0], nToCopy); - } - } - - // The maximum number of frames that LUL will produce. Setting it - // too high gives a risk of it wasting a lot of time looping on - // corrupted stacks. - const int MAX_NATIVE_FRAMES = 256; - - size_t scannedFramesAllowed = 0; - - uintptr_t framePCs[MAX_NATIVE_FRAMES]; - uintptr_t frameSPs[MAX_NATIVE_FRAMES]; - size_t framesAvail = mozilla::ArrayLength(framePCs); - size_t framesUsed = 0; - size_t scannedFramesAcquired = 0; - sLUL->Unwind( &framePCs[0], &frameSPs[0], - &framesUsed, &scannedFramesAcquired, - framesAvail, scannedFramesAllowed, - &startRegs, &stackImg ); - - NativeStack nativeStack = { - reinterpret_cast<void**>(framePCs), - reinterpret_cast<void**>(frameSPs), - mozilla::ArrayLength(framePCs), - 0 - }; - - nativeStack.count = framesUsed; - - mergeStacksIntoProfile(aProfile, aSample, nativeStack); - - // Update stats in the LUL stats object. Unfortunately this requires - // three global memory operations. - sLUL->mStats.mContext += 1; - sLUL->mStats.mCFI += framesUsed - 1 - scannedFramesAcquired; - sLUL->mStats.mScanned += scannedFramesAcquired; -} -#endif - - -static -void doSampleStackTrace(ThreadProfile &aProfile, TickSample *aSample, bool aAddLeafAddresses) -{ - NativeStack nativeStack = { nullptr, nullptr, 0, 0 }; - mergeStacksIntoProfile(aProfile, aSample, nativeStack); - -#ifdef ENABLE_SPS_LEAF_DATA - if (aSample && aAddLeafAddresses) { - aProfile.addTag(ProfileEntry('l', (void*)aSample->pc)); -#ifdef ENABLE_ARM_LR_SAVING - aProfile.addTag(ProfileEntry('L', (void*)aSample->lr)); -#endif - } -#endif -} - -void GeckoSampler::Tick(TickSample* sample) -{ - // Don't allow for ticks to happen within other ticks. - InplaceTick(sample); -} - -void GeckoSampler::InplaceTick(TickSample* sample) -{ - ThreadProfile& currThreadProfile = *sample->threadProfile; - - currThreadProfile.addTag(ProfileEntry('T', currThreadProfile.ThreadId())); - - if (sample) { - mozilla::TimeDuration delta = sample->timestamp - sStartTime; - currThreadProfile.addTag(ProfileEntry('t', delta.ToMilliseconds())); - } - - PseudoStack* stack = currThreadProfile.GetPseudoStack(); - -#if defined(USE_NS_STACKWALK) || defined(USE_EHABI_STACKWALK) || \ - defined(USE_LUL_STACKWALK) - if (mUseStackWalk) { - doNativeBacktrace(currThreadProfile, sample); - } else { - doSampleStackTrace(currThreadProfile, sample, mAddLeafAddresses); - } -#else - doSampleStackTrace(currThreadProfile, sample, mAddLeafAddresses); -#endif - - // Don't process the PeudoStack's markers if we're - // synchronously sampling the current thread. - if (!sample->isSamplingCurrentThread) { - ProfilerMarkerLinkedList* pendingMarkersList = stack->getPendingMarkers(); - while (pendingMarkersList && pendingMarkersList->peek()) { - ProfilerMarker* marker = pendingMarkersList->popHead(); - currThreadProfile.addStoredMarker(marker); - currThreadProfile.addTag(ProfileEntry('m', marker)); - } - } - -#ifndef SPS_STANDALONE - if (sample && currThreadProfile.GetThreadResponsiveness()->HasData()) { - mozilla::TimeDuration delta = currThreadProfile.GetThreadResponsiveness()->GetUnresponsiveDuration(sample->timestamp); - currThreadProfile.addTag(ProfileEntry('r', delta.ToMilliseconds())); - } -#endif - - // rssMemory is equal to 0 when we are not recording. - if (sample && sample->rssMemory != 0) { - currThreadProfile.addTag(ProfileEntry('R', static_cast<double>(sample->rssMemory))); - } - - // ussMemory is equal to 0 when we are not recording. - if (sample && sample->ussMemory != 0) { - currThreadProfile.addTag(ProfileEntry('U', static_cast<double>(sample->ussMemory))); - } - -#if defined(XP_WIN) - if (mProfilePower) { - mIntelPowerGadget->TakeSample(); - currThreadProfile.addTag(ProfileEntry('p', static_cast<double>(mIntelPowerGadget->GetTotalPackagePowerInWatts()))); - } -#endif - - if (sLastFrameNumber != sFrameNumber) { - currThreadProfile.addTag(ProfileEntry('f', sFrameNumber)); - sLastFrameNumber = sFrameNumber; - } -} - -namespace { - -SyncProfile* NewSyncProfile() -{ - PseudoStack* stack = tlsPseudoStack.get(); - if (!stack) { - MOZ_ASSERT(stack); - return nullptr; - } - Thread::tid_t tid = Thread::GetCurrentId(); - - ThreadInfo* info = new ThreadInfo("SyncProfile", tid, false, stack, nullptr); - SyncProfile* profile = new SyncProfile(info, GET_BACKTRACE_DEFAULT_ENTRY); - return profile; -} - -} // namespace - -SyncProfile* GeckoSampler::GetBacktrace() -{ - SyncProfile* profile = NewSyncProfile(); - - TickSample sample; - sample.threadProfile = profile; - -#if defined(HAVE_NATIVE_UNWIND) || defined(USE_LUL_STACKWALK) -#if defined(XP_WIN) || defined(LINUX) - tickcontext_t context; - sample.PopulateContext(&context); -#elif defined(XP_MACOSX) - sample.PopulateContext(nullptr); -#endif -#endif - - sample.isSamplingCurrentThread = true; - sample.timestamp = mozilla::TimeStamp::Now(); - - profile->BeginUnwind(); - Tick(&sample); - profile->EndUnwind(); - - return profile; -} - -void -GeckoSampler::GetBufferInfo(uint32_t *aCurrentPosition, uint32_t *aTotalSize, uint32_t *aGeneration) -{ - *aCurrentPosition = mBuffer->mWritePos; - *aTotalSize = mBuffer->mEntrySize; - *aGeneration = mBuffer->mGeneration; -} |