diff options
Diffstat (limited to 'tools/profiler/gecko/nsProfiler.cpp')
| -rw-r--r-- | tools/profiler/gecko/nsProfiler.cpp | 1445 |
1 files changed, 1445 insertions, 0 deletions
diff --git a/tools/profiler/gecko/nsProfiler.cpp b/tools/profiler/gecko/nsProfiler.cpp new file mode 100644 index 0000000000..12b6610c6d --- /dev/null +++ b/tools/profiler/gecko/nsProfiler.cpp @@ -0,0 +1,1445 @@ +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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 "nsProfiler.h" + +#include <fstream> +#include <limits> +#include <sstream> +#include <string> +#include <utility> + +#include "GeckoProfiler.h" +#include "ProfilerControl.h" +#include "ProfilerParent.h" +#include "js/Array.h" // JS::NewArrayObject +#include "js/JSON.h" +#include "js/PropertyAndElement.h" // JS_SetElement +#include "js/Value.h" +#include "json/json.h" +#include "mozilla/ErrorResult.h" +#include "mozilla/JSONStringWriteFuncs.h" +#include "mozilla/SchedulerGroup.h" +#include "mozilla/Services.h" +#include "mozilla/dom/Promise.h" +#include "mozilla/dom/TypedArray.h" +#include "mozilla/Preferences.h" +#include "nsComponentManagerUtils.h" +#include "nsIInterfaceRequestor.h" +#include "nsIInterfaceRequestorUtils.h" +#include "nsILoadContext.h" +#include "nsIWebNavigation.h" +#include "nsProfilerStartParams.h" +#include "nsProxyRelease.h" +#include "nsString.h" +#include "nsThreadUtils.h" +#include "platform.h" +#include "shared-libraries.h" +#include "zlib.h" + +#ifndef ANDROID +# include <cstdio> +#else +# include <android/log.h> +#endif + +using namespace mozilla; + +using dom::AutoJSAPI; +using dom::Promise; +using std::string; + +static constexpr size_t scLengthMax = size_t(JS::MaxStringLength); +// Used when trying to add more JSON data, to account for the extra space needed +// for the log and to close the profile. +static constexpr size_t scLengthAccumulationThreshold = scLengthMax - 16 * 1024; + +NS_IMPL_ISUPPORTS(nsProfiler, nsIProfiler) + +nsProfiler::nsProfiler() : mGathering(false) {} + +nsProfiler::~nsProfiler() { + if (mSymbolTableThread) { + mSymbolTableThread->Shutdown(); + } + ResetGathering(NS_ERROR_ILLEGAL_DURING_SHUTDOWN); +} + +nsresult nsProfiler::Init() { return NS_OK; } + +template <typename JsonLogObjectUpdater> +void nsProfiler::Log(JsonLogObjectUpdater&& aJsonLogObjectUpdater) { + if (mGatheringLog) { + MOZ_ASSERT(mGatheringLog->isObject()); + std::forward<JsonLogObjectUpdater>(aJsonLogObjectUpdater)(*mGatheringLog); + MOZ_ASSERT(mGatheringLog->isObject()); + } +} + +template <typename JsonArrayAppender> +void nsProfiler::LogEvent(JsonArrayAppender&& aJsonArrayAppender) { + Log([&](Json::Value& aRoot) { + Json::Value& events = aRoot[Json::StaticString{"events"}]; + if (!events.isArray()) { + events = Json::Value{Json::arrayValue}; + } + Json::Value newEvent{Json::arrayValue}; + newEvent.append(ProfilingLog::Timestamp()); + std::forward<JsonArrayAppender>(aJsonArrayAppender)(newEvent); + MOZ_ASSERT(newEvent.isArray()); + events.append(std::move(newEvent)); + }); +} + +void nsProfiler::LogEventLiteralString(const char* aEventString) { + LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{aEventString}); + }); +} + +static nsresult FillVectorFromStringArray(Vector<const char*>& aVector, + const nsTArray<nsCString>& aArray) { + if (NS_WARN_IF(!aVector.reserve(aArray.Length()))) { + return NS_ERROR_OUT_OF_MEMORY; + } + for (auto& entry : aArray) { + aVector.infallibleAppend(entry.get()); + } + return NS_OK; +} + +// Given a PromiseReturningFunction: () -> GenericPromise, +// run the function, and return a JS Promise (through aPromise) that will be +// resolved when the function's GenericPromise gets resolved. +template <typename PromiseReturningFunction> +static nsresult RunFunctionAndConvertPromise( + JSContext* aCx, Promise** aPromise, + PromiseReturningFunction&& aPromiseReturningFunction) { + MOZ_ASSERT(NS_IsMainThread()); + + if (NS_WARN_IF(!aCx)) { + return NS_ERROR_FAILURE; + } + + nsIGlobalObject* globalObject = xpc::CurrentNativeGlobal(aCx); + if (NS_WARN_IF(!globalObject)) { + return NS_ERROR_FAILURE; + } + + ErrorResult result; + RefPtr<Promise> promise = Promise::Create(globalObject, result); + if (NS_WARN_IF(result.Failed())) { + return result.StealNSResult(); + } + + std::forward<PromiseReturningFunction>(aPromiseReturningFunction)()->Then( + GetMainThreadSerialEventTarget(), __func__, + [promise](GenericPromise::ResolveOrRejectValue&&) { + promise->MaybeResolveWithUndefined(); + }); + + promise.forget(aPromise); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::StartProfiler(uint32_t aEntries, double aInterval, + const nsTArray<nsCString>& aFeatures, + const nsTArray<nsCString>& aFilters, + uint64_t aActiveTabID, double aDuration, + JSContext* aCx, Promise** aPromise) { + ResetGathering(NS_ERROR_DOM_ABORT_ERR); + + Vector<const char*> featureStringVector; + nsresult rv = FillVectorFromStringArray(featureStringVector, aFeatures); + if (NS_FAILED(rv)) { + return rv; + } + uint32_t features = ParseFeaturesFromStringArray( + featureStringVector.begin(), featureStringVector.length()); + Maybe<double> duration = aDuration > 0.0 ? Some(aDuration) : Nothing(); + + Vector<const char*> filterStringVector; + rv = FillVectorFromStringArray(filterStringVector, aFilters); + if (NS_FAILED(rv)) { + return rv; + } + + return RunFunctionAndConvertPromise(aCx, aPromise, [&]() { + return profiler_start(PowerOfTwo32(aEntries), aInterval, features, + filterStringVector.begin(), + filterStringVector.length(), aActiveTabID, duration); + }); +} + +NS_IMETHODIMP +nsProfiler::StopProfiler(JSContext* aCx, Promise** aPromise) { + ResetGathering(NS_ERROR_DOM_ABORT_ERR); + return RunFunctionAndConvertPromise(aCx, aPromise, + []() { return profiler_stop(); }); +} + +NS_IMETHODIMP +nsProfiler::IsPaused(bool* aIsPaused) { + *aIsPaused = profiler_is_paused(); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::Pause(JSContext* aCx, Promise** aPromise) { + return RunFunctionAndConvertPromise(aCx, aPromise, + []() { return profiler_pause(); }); +} + +NS_IMETHODIMP +nsProfiler::Resume(JSContext* aCx, Promise** aPromise) { + return RunFunctionAndConvertPromise(aCx, aPromise, + []() { return profiler_resume(); }); +} + +NS_IMETHODIMP +nsProfiler::IsSamplingPaused(bool* aIsSamplingPaused) { + *aIsSamplingPaused = profiler_is_sampling_paused(); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::PauseSampling(JSContext* aCx, Promise** aPromise) { + return RunFunctionAndConvertPromise( + aCx, aPromise, []() { return profiler_pause_sampling(); }); +} + +NS_IMETHODIMP +nsProfiler::ResumeSampling(JSContext* aCx, Promise** aPromise) { + return RunFunctionAndConvertPromise( + aCx, aPromise, []() { return profiler_resume_sampling(); }); +} + +NS_IMETHODIMP +nsProfiler::ClearAllPages() { + profiler_clear_all_pages(); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::WaitOnePeriodicSampling(JSContext* aCx, Promise** aPromise) { + MOZ_ASSERT(NS_IsMainThread()); + + if (NS_WARN_IF(!aCx)) { + return NS_ERROR_FAILURE; + } + + nsIGlobalObject* globalObject = xpc::CurrentNativeGlobal(aCx); + if (NS_WARN_IF(!globalObject)) { + return NS_ERROR_FAILURE; + } + + ErrorResult result; + RefPtr<Promise> promise = Promise::Create(globalObject, result); + if (NS_WARN_IF(result.Failed())) { + return result.StealNSResult(); + } + + // The callback cannot officially own the promise RefPtr directly, because + // `Promise` doesn't support multi-threading, and the callback could destroy + // the promise in the sampler thread. + // `nsMainThreadPtrHandle` ensures that the promise can only be destroyed on + // the main thread. And the invocation from the Sampler thread immediately + // dispatches a task back to the main thread, to resolve/reject the promise. + // The lambda needs to be `mutable`, to allow moving-from + // `promiseHandleInSampler`. + if (!profiler_callback_after_sampling( + [promiseHandleInSampler = nsMainThreadPtrHandle<Promise>( + new nsMainThreadPtrHolder<Promise>( + "WaitOnePeriodicSampling promise for Sampler", promise))]( + SamplingState aSamplingState) mutable { + SchedulerGroup::Dispatch( + TaskCategory::Other, + NS_NewRunnableFunction( + "nsProfiler::WaitOnePeriodicSampling result on main thread", + [promiseHandleInMT = std::move(promiseHandleInSampler), + aSamplingState]() mutable { + switch (aSamplingState) { + case SamplingState::JustStopped: + case SamplingState::SamplingPaused: + promiseHandleInMT->MaybeReject(NS_ERROR_FAILURE); + break; + + case SamplingState::NoStackSamplingCompleted: + case SamplingState::SamplingCompleted: + // The parent process has succesfully done a sampling, + // check the child processes (if any). + ProfilerParent::WaitOnePeriodicSampling()->Then( + GetMainThreadSerialEventTarget(), __func__, + [promiseHandleInMT = + std::move(promiseHandleInMT)]( + GenericPromise::ResolveOrRejectValue&&) { + promiseHandleInMT->MaybeResolveWithUndefined(); + }); + break; + + default: + MOZ_ASSERT(false, "Unexpected SamplingState value"); + promiseHandleInMT->MaybeReject( + NS_ERROR_DOM_UNKNOWN_ERR); + break; + } + })); + })) { + // Callback was not added (e.g., profiler is not running) and will never be + // invoked, so we need to resolve the promise here. + promise->MaybeReject(NS_ERROR_DOM_UNKNOWN_ERR); + } + + promise.forget(aPromise); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetProfile(double aSinceTime, char** aProfile) { + mozilla::UniquePtr<char[]> profile = profiler_get_profile(aSinceTime); + *aProfile = profile.release(); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetSharedLibraries(JSContext* aCx, + JS::MutableHandle<JS::Value> aResult) { + JS::Rooted<JS::Value> val(aCx); + { + JSONStringWriteFunc<nsCString> buffer; + JSONWriter w(buffer, JSONWriter::SingleLineStyle); + w.StartArrayElement(); + AppendSharedLibraries(w); + w.EndArray(); + NS_ConvertUTF8toUTF16 buffer16(buffer.StringCRef()); + MOZ_ALWAYS_TRUE(JS_ParseJSON(aCx, + static_cast<const char16_t*>(buffer16.get()), + buffer16.Length(), &val)); + } + JS::Rooted<JSObject*> obj(aCx, &val.toObject()); + if (!obj) { + return NS_ERROR_FAILURE; + } + aResult.setObject(*obj); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetActiveConfiguration(JSContext* aCx, + JS::MutableHandle<JS::Value> aResult) { + JS::Rooted<JS::Value> jsValue(aCx); + { + JSONStringWriteFunc<nsCString> buffer; + JSONWriter writer(buffer, JSONWriter::SingleLineStyle); + profiler_write_active_configuration(writer); + NS_ConvertUTF8toUTF16 buffer16(buffer.StringCRef()); + MOZ_ALWAYS_TRUE(JS_ParseJSON(aCx, + static_cast<const char16_t*>(buffer16.get()), + buffer16.Length(), &jsValue)); + } + if (jsValue.isNull()) { + aResult.setNull(); + } else { + JS::Rooted<JSObject*> obj(aCx, &jsValue.toObject()); + if (!obj) { + return NS_ERROR_FAILURE; + } + aResult.setObject(*obj); + } + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::DumpProfileToFile(const char* aFilename) { + profiler_save_profile_to_file(aFilename); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetProfileData(double aSinceTime, JSContext* aCx, + JS::MutableHandle<JS::Value> aResult) { + mozilla::UniquePtr<char[]> profile = profiler_get_profile(aSinceTime); + if (!profile) { + return NS_ERROR_FAILURE; + } + + NS_ConvertUTF8toUTF16 js_string(nsDependentCString(profile.get())); + auto profile16 = static_cast<const char16_t*>(js_string.get()); + + JS::Rooted<JS::Value> val(aCx); + MOZ_ALWAYS_TRUE(JS_ParseJSON(aCx, profile16, js_string.Length(), &val)); + + aResult.set(val); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetProfileDataAsync(double aSinceTime, JSContext* aCx, + Promise** aPromise) { + MOZ_ASSERT(NS_IsMainThread()); + + if (!profiler_is_active()) { + return NS_ERROR_FAILURE; + } + + if (NS_WARN_IF(!aCx)) { + return NS_ERROR_FAILURE; + } + + nsIGlobalObject* globalObject = xpc::CurrentNativeGlobal(aCx); + if (NS_WARN_IF(!globalObject)) { + return NS_ERROR_FAILURE; + } + + ErrorResult result; + RefPtr<Promise> promise = Promise::Create(globalObject, result); + if (NS_WARN_IF(result.Failed())) { + return result.StealNSResult(); + } + + StartGathering(aSinceTime) + ->Then( + GetMainThreadSerialEventTarget(), __func__, + [promise](nsCString aResult) { + AutoJSAPI jsapi; + if (NS_WARN_IF(!jsapi.Init(promise->GetGlobalObject()))) { + // We're really hosed if we can't get a JS context for some + // reason. + promise->MaybeReject(NS_ERROR_DOM_UNKNOWN_ERR); + return; + } + + JSContext* cx = jsapi.cx(); + + // Now parse the JSON so that we resolve with a JS Object. + JS::Rooted<JS::Value> val(cx); + { + NS_ConvertUTF8toUTF16 js_string(aResult); + if (!JS_ParseJSON(cx, + static_cast<const char16_t*>(js_string.get()), + js_string.Length(), &val)) { + if (!jsapi.HasException()) { + promise->MaybeReject(NS_ERROR_DOM_UNKNOWN_ERR); + } else { + JS::Rooted<JS::Value> exn(cx); + DebugOnly<bool> gotException = jsapi.StealException(&exn); + MOZ_ASSERT(gotException); + + jsapi.ClearException(); + promise->MaybeReject(exn); + } + } else { + promise->MaybeResolve(val); + } + } + }, + [promise](nsresult aRv) { promise->MaybeReject(aRv); }); + + promise.forget(aPromise); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetProfileDataAsArrayBuffer(double aSinceTime, JSContext* aCx, + Promise** aPromise) { + MOZ_ASSERT(NS_IsMainThread()); + + if (!profiler_is_active()) { + return NS_ERROR_FAILURE; + } + + if (NS_WARN_IF(!aCx)) { + return NS_ERROR_FAILURE; + } + + nsIGlobalObject* globalObject = xpc::CurrentNativeGlobal(aCx); + if (NS_WARN_IF(!globalObject)) { + return NS_ERROR_FAILURE; + } + + ErrorResult result; + RefPtr<Promise> promise = Promise::Create(globalObject, result); + if (NS_WARN_IF(result.Failed())) { + return result.StealNSResult(); + } + + StartGathering(aSinceTime) + ->Then( + GetMainThreadSerialEventTarget(), __func__, + [promise](nsCString aResult) { + AutoJSAPI jsapi; + if (NS_WARN_IF(!jsapi.Init(promise->GetGlobalObject()))) { + // We're really hosed if we can't get a JS context for some + // reason. + promise->MaybeReject(NS_ERROR_DOM_UNKNOWN_ERR); + return; + } + + JSContext* cx = jsapi.cx(); + JSObject* typedArray = dom::ArrayBuffer::Create( + cx, aResult.Length(), + reinterpret_cast<const uint8_t*>(aResult.Data())); + if (typedArray) { + JS::Rooted<JS::Value> val(cx, JS::ObjectValue(*typedArray)); + promise->MaybeResolve(val); + } else { + promise->MaybeReject(NS_ERROR_OUT_OF_MEMORY); + } + }, + [promise](nsresult aRv) { promise->MaybeReject(aRv); }); + + promise.forget(aPromise); + return NS_OK; +} + +nsresult CompressString(const nsCString& aString, + FallibleTArray<uint8_t>& aOutBuff) { + // Compress a buffer via zlib (as with `compress()`), but emit a + // gzip header as well. Like `compress()`, this is limited to 4GB in + // size, but that shouldn't be an issue for our purposes. + uLongf outSize = compressBound(aString.Length()); + if (!aOutBuff.SetLength(outSize, fallible)) { + return NS_ERROR_OUT_OF_MEMORY; + } + + int zerr; + z_stream stream; + stream.zalloc = nullptr; + stream.zfree = nullptr; + stream.opaque = nullptr; + stream.next_out = (Bytef*)aOutBuff.Elements(); + stream.avail_out = aOutBuff.Length(); + stream.next_in = (z_const Bytef*)aString.Data(); + stream.avail_in = aString.Length(); + + // A windowBits of 31 is the default (15) plus 16 for emitting a + // gzip header; a memLevel of 8 is the default. + zerr = + deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, + /* windowBits */ 31, /* memLevel */ 8, Z_DEFAULT_STRATEGY); + if (zerr != Z_OK) { + return NS_ERROR_FAILURE; + } + + zerr = deflate(&stream, Z_FINISH); + outSize = stream.total_out; + deflateEnd(&stream); + + if (zerr != Z_STREAM_END) { + return NS_ERROR_FAILURE; + } + + aOutBuff.TruncateLength(outSize); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetProfileDataAsGzippedArrayBuffer(double aSinceTime, + JSContext* aCx, + Promise** aPromise) { + MOZ_ASSERT(NS_IsMainThread()); + + if (!profiler_is_active()) { + return NS_ERROR_FAILURE; + } + + if (NS_WARN_IF(!aCx)) { + return NS_ERROR_FAILURE; + } + + nsIGlobalObject* globalObject = xpc::CurrentNativeGlobal(aCx); + if (NS_WARN_IF(!globalObject)) { + return NS_ERROR_FAILURE; + } + + ErrorResult result; + RefPtr<Promise> promise = Promise::Create(globalObject, result); + if (NS_WARN_IF(result.Failed())) { + return result.StealNSResult(); + } + + StartGathering(aSinceTime) + ->Then( + GetMainThreadSerialEventTarget(), __func__, + [promise](nsCString aResult) { + AutoJSAPI jsapi; + if (NS_WARN_IF(!jsapi.Init(promise->GetGlobalObject()))) { + // We're really hosed if we can't get a JS context for some + // reason. + promise->MaybeReject(NS_ERROR_DOM_UNKNOWN_ERR); + return; + } + + FallibleTArray<uint8_t> outBuff; + nsresult result = CompressString(aResult, outBuff); + + if (result != NS_OK) { + promise->MaybeReject(result); + return; + } + + JSContext* cx = jsapi.cx(); + JSObject* typedArray = dom::ArrayBuffer::Create( + cx, outBuff.Length(), outBuff.Elements()); + if (typedArray) { + JS::Rooted<JS::Value> val(cx, JS::ObjectValue(*typedArray)); + promise->MaybeResolve(val); + } else { + promise->MaybeReject(NS_ERROR_OUT_OF_MEMORY); + } + }, + [promise](nsresult aRv) { promise->MaybeReject(aRv); }); + + promise.forget(aPromise); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::DumpProfileToFileAsync(const nsACString& aFilename, + double aSinceTime, JSContext* aCx, + Promise** aPromise) { + MOZ_ASSERT(NS_IsMainThread()); + + if (!profiler_is_active()) { + return NS_ERROR_FAILURE; + } + + if (NS_WARN_IF(!aCx)) { + return NS_ERROR_FAILURE; + } + + nsIGlobalObject* globalObject = xpc::CurrentNativeGlobal(aCx); + if (NS_WARN_IF(!globalObject)) { + return NS_ERROR_FAILURE; + } + + ErrorResult result; + RefPtr<Promise> promise = Promise::Create(globalObject, result); + if (NS_WARN_IF(result.Failed())) { + return result.StealNSResult(); + } + + nsCString filename(aFilename); + + StartGathering(aSinceTime) + ->Then( + GetMainThreadSerialEventTarget(), __func__, + [filename, promise](const nsCString& aResult) { + if (aResult.Length() >= + size_t(std::numeric_limits<std::streamsize>::max())) { + promise->MaybeReject(NS_ERROR_FILE_TOO_BIG); + return; + } + + std::ofstream stream; + stream.open(filename.get()); + if (!stream.is_open()) { + promise->MaybeReject(NS_ERROR_FILE_UNRECOGNIZED_PATH); + return; + } + + stream.write(aResult.get(), std::streamsize(aResult.Length())); + stream.close(); + + promise->MaybeResolveWithUndefined(); + }, + [promise](nsresult aRv) { promise->MaybeReject(aRv); }); + + promise.forget(aPromise); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetSymbolTable(const nsACString& aDebugPath, + const nsACString& aBreakpadID, JSContext* aCx, + Promise** aPromise) { + MOZ_ASSERT(NS_IsMainThread()); + + if (NS_WARN_IF(!aCx)) { + return NS_ERROR_FAILURE; + } + + nsIGlobalObject* globalObject = + xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx)); + + if (NS_WARN_IF(!globalObject)) { + return NS_ERROR_FAILURE; + } + + ErrorResult result; + RefPtr<Promise> promise = Promise::Create(globalObject, result); + if (NS_WARN_IF(result.Failed())) { + return result.StealNSResult(); + } + + GetSymbolTableMozPromise(aDebugPath, aBreakpadID) + ->Then( + GetMainThreadSerialEventTarget(), __func__, + [promise](const SymbolTable& aSymbolTable) { + AutoJSAPI jsapi; + if (NS_WARN_IF(!jsapi.Init(promise->GetGlobalObject()))) { + // We're really hosed if we can't get a JS context for some + // reason. + promise->MaybeReject(NS_ERROR_DOM_UNKNOWN_ERR); + return; + } + + JSContext* cx = jsapi.cx(); + + JS::Rooted<JSObject*> addrsArray( + cx, dom::Uint32Array::Create(cx, aSymbolTable.mAddrs.Length(), + aSymbolTable.mAddrs.Elements())); + JS::Rooted<JSObject*> indexArray( + cx, dom::Uint32Array::Create(cx, aSymbolTable.mIndex.Length(), + aSymbolTable.mIndex.Elements())); + JS::Rooted<JSObject*> bufferArray( + cx, dom::Uint8Array::Create(cx, aSymbolTable.mBuffer.Length(), + aSymbolTable.mBuffer.Elements())); + + if (addrsArray && indexArray && bufferArray) { + JS::Rooted<JSObject*> tuple(cx, JS::NewArrayObject(cx, 3)); + JS_SetElement(cx, tuple, 0, addrsArray); + JS_SetElement(cx, tuple, 1, indexArray); + JS_SetElement(cx, tuple, 2, bufferArray); + promise->MaybeResolve(tuple); + } else { + promise->MaybeReject(NS_ERROR_FAILURE); + } + }, + [promise](nsresult aRv) { promise->MaybeReject(aRv); }); + + promise.forget(aPromise); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetElapsedTime(double* aElapsedTime) { + *aElapsedTime = profiler_time(); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::IsActive(bool* aIsActive) { + *aIsActive = profiler_is_active(); + return NS_OK; +} + +static void GetArrayOfStringsForFeatures(uint32_t aFeatures, + nsTArray<nsCString>& aFeatureList) { +#define COUNT_IF_SET(n_, str_, Name_, desc_) \ + if (ProfilerFeature::Has##Name_(aFeatures)) { \ + len++; \ + } + + // Count the number of features in use. + uint32_t len = 0; + PROFILER_FOR_EACH_FEATURE(COUNT_IF_SET) + +#undef COUNT_IF_SET + + aFeatureList.SetCapacity(len); + +#define DUP_IF_SET(n_, str_, Name_, desc_) \ + if (ProfilerFeature::Has##Name_(aFeatures)) { \ + aFeatureList.AppendElement(str_); \ + } + + // Insert the strings for the features in use. + PROFILER_FOR_EACH_FEATURE(DUP_IF_SET) + +#undef DUP_IF_SET +} + +NS_IMETHODIMP +nsProfiler::GetFeatures(nsTArray<nsCString>& aFeatureList) { + uint32_t features = profiler_get_available_features(); + GetArrayOfStringsForFeatures(features, aFeatureList); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetAllFeatures(nsTArray<nsCString>& aFeatureList) { + GetArrayOfStringsForFeatures((uint32_t)-1, aFeatureList); + return NS_OK; +} + +NS_IMETHODIMP +nsProfiler::GetBufferInfo(uint32_t* aCurrentPosition, uint32_t* aTotalSize, + uint32_t* aGeneration) { + MOZ_ASSERT(aCurrentPosition); + MOZ_ASSERT(aTotalSize); + MOZ_ASSERT(aGeneration); + Maybe<ProfilerBufferInfo> info = profiler_get_buffer_info(); + if (info) { + *aCurrentPosition = info->mRangeEnd % info->mEntryCount; + *aTotalSize = info->mEntryCount; + *aGeneration = info->mRangeEnd / info->mEntryCount; + } else { + *aCurrentPosition = 0; + *aTotalSize = 0; + *aGeneration = 0; + } + return NS_OK; +} + +bool nsProfiler::SendProgressRequest(PendingProfile& aPendingProfile) { + RefPtr<ProfilerParent::SingleProcessProgressPromise> progressPromise = + ProfilerParent::RequestGatherProfileProgress(aPendingProfile.childPid); + if (!progressPromise) { + LOG("RequestGatherProfileProgress(%u) -> null!", + unsigned(aPendingProfile.childPid)); + LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Failed to send progress request to pid:"}); + aEvent.append(Json::Value::UInt64(aPendingProfile.childPid)); + }); + // Failed to send request. + return false; + } + + DEBUG_LOG("RequestGatherProfileProgress(%u) sent...", + unsigned(aPendingProfile.childPid)); + LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{"Requested progress from pid:"}); + aEvent.append(Json::Value::UInt64(aPendingProfile.childPid)); + }); + aPendingProfile.lastProgressRequest = TimeStamp::Now(); + progressPromise->Then( + GetMainThreadSerialEventTarget(), __func__, + [self = RefPtr<nsProfiler>(this), + childPid = aPendingProfile.childPid](GatherProfileProgress&& aResult) { + if (!self->mGathering) { + return; + } + PendingProfile* pendingProfile = self->GetPendingProfile(childPid); + DEBUG_LOG( + "RequestGatherProfileProgress(%u) response: %.2f '%s' " + "(%u were pending, %s %u)", + unsigned(childPid), + ProportionValue::FromUnderlyingType( + aResult.progressProportionValueUnderlyingType()) + .ToDouble() * + 100.0, + aResult.progressLocation().Data(), + unsigned(self->mPendingProfiles.length()), + pendingProfile ? "including" : "excluding", unsigned(childPid)); + self->LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Got response from pid, with progress:"}); + aEvent.append(Json::Value::UInt64(childPid)); + aEvent.append( + Json::Value{ProportionValue::FromUnderlyingType( + aResult.progressProportionValueUnderlyingType()) + .ToDouble() * + 100.0}); + }); + if (pendingProfile) { + // We have a progress report for a still-pending profile. + pendingProfile->lastProgressResponse = TimeStamp::Now(); + // Has it actually made progress? + if (aResult.progressProportionValueUnderlyingType() != + pendingProfile->progressProportion.ToUnderlyingType()) { + pendingProfile->lastProgressChange = + pendingProfile->lastProgressResponse; + pendingProfile->progressProportion = + ProportionValue::FromUnderlyingType( + aResult.progressProportionValueUnderlyingType()); + pendingProfile->progressLocation = aResult.progressLocation(); + self->RestartGatheringTimer(); + } + } + }, + [self = RefPtr<nsProfiler>(this), childPid = aPendingProfile.childPid]( + ipc::ResponseRejectReason&& aReason) { + if (!self->mGathering) { + return; + } + PendingProfile* pendingProfile = self->GetPendingProfile(childPid); + LOG("RequestGatherProfileProgress(%u) rejection: %d " + "(%u were pending, %s %u)", + unsigned(childPid), (int)aReason, + unsigned(self->mPendingProfiles.length()), + pendingProfile ? "including" : "excluding", unsigned(childPid)); + self->LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{ + "Got progress request rejection from pid, with reason:"}); + aEvent.append(Json::Value::UInt64(childPid)); + aEvent.append(Json::Value::UInt{static_cast<unsigned>(aReason)}); + }); + if (pendingProfile) { + // Failure response, assume the child process is gone. + MOZ_ASSERT(self->mPendingProfiles.begin() <= pendingProfile && + pendingProfile < self->mPendingProfiles.end()); + self->mPendingProfiles.erase(pendingProfile); + if (self->mPendingProfiles.empty()) { + // We've got all of the async profiles now. Let's finish off the + // profile and resolve the Promise. + self->FinishGathering(); + } + } + }); + return true; +} + +/* static */ void nsProfiler::GatheringTimerCallback(nsITimer* aTimer, + void* aClosure) { + MOZ_RELEASE_ASSERT(NS_IsMainThread()); + nsCOMPtr<nsIProfiler> profiler( + do_GetService("@mozilla.org/tools/profiler;1")); + if (!profiler) { + // No (more) profiler service. + return; + } + nsProfiler* self = static_cast<nsProfiler*>(profiler.get()); + if (self != aClosure) { + // Different service object!? + return; + } + if (aTimer != self->mGatheringTimer) { + // This timer was cancelled after this callback was queued. + return; + } + + bool progressWasMade = false; + + // Going backwards, it's easier and cheaper to erase elements if needed. + for (auto iPlus1 = self->mPendingProfiles.length(); iPlus1 != 0; --iPlus1) { + PendingProfile& pendingProfile = self->mPendingProfiles[iPlus1 - 1]; + + bool needToSendProgressRequest = false; + if (pendingProfile.lastProgressRequest.IsNull()) { + DEBUG_LOG("GatheringTimerCallback() - child %u: No data yet", + unsigned(pendingProfile.childPid)); + // First time going through the list, send an initial progress request. + needToSendProgressRequest = true; + // We pretend that progress was made, so we don't give up yet. + progressWasMade = true; + } else if (pendingProfile.lastProgressResponse.IsNull()) { + LOG("GatheringTimerCallback() - child %u: Waiting for first response", + unsigned(pendingProfile.childPid)); + // Still waiting for the first response, no progress made here, don't send + // another request. + } else if (pendingProfile.lastProgressResponse <= + pendingProfile.lastProgressRequest) { + LOG("GatheringTimerCallback() - child %u: Waiting for response", + unsigned(pendingProfile.childPid)); + // Still waiting for a response to the last request, no progress made + // here, don't send another request. + } else if (pendingProfile.lastProgressChange.IsNull()) { + LOG("GatheringTimerCallback() - child %u: Still waiting for first change", + unsigned(pendingProfile.childPid)); + // Still waiting for the first change, no progress made here, but send a + // new request. + needToSendProgressRequest = true; + } else if (pendingProfile.lastProgressRequest < + pendingProfile.lastProgressChange) { + DEBUG_LOG("GatheringTimerCallback() - child %u: Recent change", + unsigned(pendingProfile.childPid)); + // We have a recent change, progress was made. + needToSendProgressRequest = true; + progressWasMade = true; + } else { + LOG("GatheringTimerCallback() - child %u: No recent change", + unsigned(pendingProfile.childPid)); + needToSendProgressRequest = true; + } + + // And send a new progress request. + if (needToSendProgressRequest) { + if (!self->SendProgressRequest(pendingProfile)) { + // Failed to even send the request, consider this process gone. + self->mPendingProfiles.erase(&pendingProfile); + LOG("... Failed to send progress request"); + } else { + DEBUG_LOG("... Sent progress request"); + } + } else { + DEBUG_LOG("... No progress request"); + } + } + + if (self->mPendingProfiles.empty()) { + // We've got all of the async profiles now. Let's finish off the profile + // and resolve the Promise. + self->FinishGathering(); + return; + } + + // Not finished yet. + + if (progressWasMade) { + // We made some progress, just restart the timer. + DEBUG_LOG("GatheringTimerCallback() - Progress made, restart timer"); + self->RestartGatheringTimer(); + return; + } + + DEBUG_LOG("GatheringTimerCallback() - Timeout!"); + self->mGatheringTimer = nullptr; + if (!profiler_is_active() || !self->mGathering) { + // Not gathering anymore. + return; + } + self->LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{ + "No progress made recently, giving up; pending pids:"}); + for (const PendingProfile& pendingProfile : self->mPendingProfiles) { + aEvent.append(Json::Value::UInt64(pendingProfile.childPid)); + } + }); + NS_WARNING("Profiler failed to gather profiles from all sub-processes"); + // We have really reached a timeout while gathering, finish now. + // TODO: Add information about missing processes. + self->FinishGathering(); +} + +void nsProfiler::RestartGatheringTimer() { + if (mGatheringTimer) { + uint32_t delayMs = 0; + const nsresult r = mGatheringTimer->GetDelay(&delayMs); + mGatheringTimer->Cancel(); + if (NS_FAILED(r) || delayMs == 0 || + NS_FAILED(mGatheringTimer->InitWithNamedFuncCallback( + GatheringTimerCallback, this, delayMs, + nsITimer::TYPE_ONE_SHOT_LOW_PRIORITY, + "nsProfilerGatheringTimer"))) { + // Can't restart the timer, so we can't wait any longer. + FinishGathering(); + } + } +} + +nsProfiler::PendingProfile* nsProfiler::GetPendingProfile( + base::ProcessId aChildPid) { + for (PendingProfile& pendingProfile : mPendingProfiles) { + if (pendingProfile.childPid == aChildPid) { + return &pendingProfile; + } + } + return nullptr; +} + +void nsProfiler::GatheredOOPProfile(base::ProcessId aChildPid, + const nsACString& aProfile) { + MOZ_RELEASE_ASSERT(NS_IsMainThread()); + + if (!profiler_is_active()) { + return; + } + + if (!mGathering) { + // If we're not actively gathering, then we don't actually care that we + // gathered a profile here. This can happen for processes that exit while + // profiling. + return; + } + + MOZ_RELEASE_ASSERT(mWriter.isSome(), + "Should always have a writer if mGathering is true"); + + if (!aProfile.IsEmpty()) { + if (mWriter->ChunkedWriteFunc().Length() + aProfile.Length() < + scLengthAccumulationThreshold) { + // TODO: Remove PromiseFlatCString, see bug 1657033. + mWriter->Splice(PromiseFlatCString(aProfile)); + } else { + LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Discarded child profile that would make the " + "full profile too big, pid and size:"}); + aEvent.append(Json::Value::UInt64(aChildPid)); + aEvent.append(Json::Value::UInt64{aProfile.Length()}); + }); + } + } + + if (PendingProfile* pendingProfile = GetPendingProfile(aChildPid); + pendingProfile) { + mPendingProfiles.erase(pendingProfile); + + if (mPendingProfiles.empty()) { + // We've got all of the async profiles now. Let's finish off the profile + // and resolve the Promise. + FinishGathering(); + } + } + + // Not finished yet, restart the timer to let any remaining child enough time + // to do their profile-streaming. + RestartGatheringTimer(); +} + +RefPtr<nsProfiler::GatheringPromiseAndroid> +nsProfiler::GetProfileDataAsGzippedArrayBufferAndroid(double aSinceTime) { + MOZ_ASSERT(NS_IsMainThread()); + + if (!profiler_is_active()) { + return GatheringPromiseAndroid::CreateAndReject(NS_ERROR_FAILURE, __func__); + } + + return StartGathering(aSinceTime) + ->Then( + GetMainThreadSerialEventTarget(), __func__, + [](const nsCString& profileResult) { + FallibleTArray<uint8_t> outBuff; + nsresult result = CompressString(profileResult, outBuff); + if (result != NS_OK) { + return GatheringPromiseAndroid::CreateAndReject(result, __func__); + } + return GatheringPromiseAndroid::CreateAndResolve(std::move(outBuff), + __func__); + }, + [](nsresult aRv) { + return GatheringPromiseAndroid::CreateAndReject(aRv, __func__); + }); +} + +RefPtr<nsProfiler::GatheringPromise> nsProfiler::StartGathering( + double aSinceTime) { + MOZ_RELEASE_ASSERT(NS_IsMainThread()); + + if (mGathering) { + // If we're already gathering, return a rejected promise - this isn't + // going to end well. + return GatheringPromise::CreateAndReject(NS_ERROR_NOT_AVAILABLE, __func__); + } + + mGathering = true; + mGatheringLog = mozilla::MakeUnique<Json::Value>(Json::objectValue); + (*mGatheringLog)[Json::StaticString{ + "profileGatheringLogBegin" TIMESTAMP_JSON_SUFFIX}] = + ProfilingLog::Timestamp(); + + if (mGatheringTimer) { + mGatheringTimer->Cancel(); + mGatheringTimer = nullptr; + } + + // Request profiles from the other processes. This will trigger asynchronous + // calls to ProfileGatherer::GatheredOOPProfile as the profiles arrive. + // + // Do this before the call to profiler_stream_json_for_this_process() because + // that call is slow and we want to let the other processes grab their + // profiles as soon as possible. + nsTArray<ProfilerParent::SingleProcessProfilePromiseAndChildPid> profiles = + ProfilerParent::GatherProfiles(); + + MOZ_ASSERT(mPendingProfiles.empty()); + if (!mPendingProfiles.reserve(profiles.Length())) { + ResetGathering(NS_ERROR_OUT_OF_MEMORY); + return GatheringPromise::CreateAndReject(NS_ERROR_OUT_OF_MEMORY, __func__); + } + + mFailureLatchSource.emplace(); + mWriter.emplace(*mFailureLatchSource); + + UniquePtr<ProfilerCodeAddressService> service = + profiler_code_address_service_for_presymbolication(); + + // Start building up the JSON result and grab the profile from this process. + mWriter->Start(); + if (!profiler_stream_json_for_this_process(*mWriter, aSinceTime, + /* aIsShuttingDown */ false, + service.get())) { + // The profiler is inactive. This either means that it was inactive even + // at the time that ProfileGatherer::Start() was called, or that it was + // stopped on a different thread since that call. Either way, we need to + // reject the promise and stop gathering. + ResetGathering(NS_ERROR_NOT_AVAILABLE); + return GatheringPromise::CreateAndReject(NS_ERROR_NOT_AVAILABLE, __func__); + } + + LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Generated parent process profile, size:"}); + aEvent.append(Json::Value::UInt64{mWriter->ChunkedWriteFunc().Length()}); + }); + + mWriter->StartArrayProperty("processes"); + + // If we have any process exit profiles, add them immediately. + if (Vector<nsCString> exitProfiles = profiler_move_exit_profiles(); + !exitProfiles.empty()) { + for (auto& exitProfile : exitProfiles) { + if (!exitProfile.IsEmpty()) { + if (exitProfile[0] == '*') { + LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Exit non-profile with error message:"}); + aEvent.append(exitProfile.Data() + 1); + }); + } else if (mWriter->ChunkedWriteFunc().Length() + exitProfile.Length() < + scLengthAccumulationThreshold) { + mWriter->Splice(exitProfile); + LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{"Added exit profile with size:"}); + aEvent.append(Json::Value::UInt64{exitProfile.Length()}); + }); + } else { + LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Discarded an exit profile that would make " + "the full profile too big, size:"}); + aEvent.append(Json::Value::UInt64{exitProfile.Length()}); + }); + } + } + } + + LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{ + "Processed all exit profiles, total size so far:"}); + aEvent.append(Json::Value::UInt64{mWriter->ChunkedWriteFunc().Length()}); + }); + } else { + // There are no pending profiles, we're already done. + LogEventLiteralString("No exit profiles."); + } + + mPromiseHolder.emplace(); + RefPtr<GatheringPromise> promise = mPromiseHolder->Ensure(__func__); + + // Keep the array property "processes" and the root object in mWriter open + // until FinishGathering() is called. As profiles from the other processes + // come in, they will be inserted and end up in the right spot. + // FinishGathering() will close the array and the root object. + + if (!profiles.IsEmpty()) { + // There *are* pending profiles, let's add handlers for their promises. + + // This timeout value is used to monitor progress while gathering child + // profiles. The timer will be restarted after we receive a response with + // any progress. + constexpr uint32_t cMinChildTimeoutS = 1u; // 1 second minimum and default. + constexpr uint32_t cMaxChildTimeoutS = 60u; // 1 minute max. + uint32_t childTimeoutS = Preferences::GetUint( + "devtools.performance.recording.child.timeout_s", cMinChildTimeoutS); + if (childTimeoutS < cMinChildTimeoutS) { + childTimeoutS = cMinChildTimeoutS; + } else if (childTimeoutS > cMaxChildTimeoutS) { + childTimeoutS = cMaxChildTimeoutS; + } + const uint32_t childTimeoutMs = childTimeoutS * PR_MSEC_PER_SEC; + Unused << NS_NewTimerWithFuncCallback( + getter_AddRefs(mGatheringTimer), GatheringTimerCallback, this, + childTimeoutMs, nsITimer::TYPE_ONE_SHOT_LOW_PRIORITY, + "nsProfilerGatheringTimer", GetMainThreadSerialEventTarget()); + + MOZ_ASSERT(mPendingProfiles.capacity() >= profiles.Length()); + for (const auto& profile : profiles) { + mPendingProfiles.infallibleAppend(PendingProfile{profile.childPid}); + LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{"Waiting for pending profile, pid:"}); + aEvent.append(Json::Value::UInt64(profile.childPid)); + }); + profile.profilePromise->Then( + GetMainThreadSerialEventTarget(), __func__, + [self = RefPtr<nsProfiler>(this), + childPid = profile.childPid](mozilla::ipc::Shmem&& aResult) { + PendingProfile* pendingProfile = self->GetPendingProfile(childPid); + LOG("GatherProfile(%u) response: %u bytes (%u were pending, %s %u)", + unsigned(childPid), unsigned(aResult.Size<char>()), + unsigned(self->mPendingProfiles.length()), + pendingProfile ? "including" : "excluding", unsigned(childPid)); + if (aResult.IsReadable()) { + self->LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Got profile from pid, with size:"}); + aEvent.append(Json::Value::UInt64(childPid)); + aEvent.append(Json::Value::UInt64{aResult.Size<char>()}); + }); + const nsDependentCSubstring profileString( + aResult.get<char>(), aResult.Size<char>() - 1); + if (profileString.IsEmpty() || profileString[0] != '*') { + self->GatheredOOPProfile(childPid, profileString); + } else { + self->LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{ + "Child non-profile from pid, with error message:"}); + aEvent.append(Json::Value::UInt64(childPid)); + aEvent.append(profileString.Data() + 1); + }); + self->GatheredOOPProfile(childPid, ""_ns); + } + } else { + // This can happen if the child failed to allocate + // the Shmem (or maliciously sent an invalid Shmem). + self->LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{"Got failure from pid:"}); + aEvent.append(Json::Value::UInt64(childPid)); + }); + self->GatheredOOPProfile(childPid, ""_ns); + } + }, + [self = RefPtr<nsProfiler>(this), + childPid = profile.childPid](ipc::ResponseRejectReason&& aReason) { + PendingProfile* pendingProfile = self->GetPendingProfile(childPid); + LOG("GatherProfile(%u) rejection: %d (%u were pending, %s %u)", + unsigned(childPid), (int)aReason, + unsigned(self->mPendingProfiles.length()), + pendingProfile ? "including" : "excluding", unsigned(childPid)); + self->LogEvent([&](Json::Value& aEvent) { + aEvent.append( + Json::StaticString{"Got rejection from pid, with reason:"}); + aEvent.append(Json::Value::UInt64(childPid)); + aEvent.append(Json::Value::UInt{static_cast<unsigned>(aReason)}); + }); + self->GatheredOOPProfile(childPid, ""_ns); + }); + } + } else { + // There are no pending profiles, we're already done. + LogEventLiteralString("No pending child profiles."); + FinishGathering(); + } + + return promise; +} + +RefPtr<nsProfiler::SymbolTablePromise> nsProfiler::GetSymbolTableMozPromise( + const nsACString& aDebugPath, const nsACString& aBreakpadID) { + MozPromiseHolder<SymbolTablePromise> promiseHolder; + RefPtr<SymbolTablePromise> promise = promiseHolder.Ensure(__func__); + + if (!mSymbolTableThread) { + nsresult rv = NS_NewNamedThread("ProfSymbolTable", + getter_AddRefs(mSymbolTableThread)); + if (NS_WARN_IF(NS_FAILED(rv))) { + promiseHolder.Reject(NS_ERROR_FAILURE, __func__); + return promise; + } + } + + nsresult rv = mSymbolTableThread->Dispatch(NS_NewRunnableFunction( + "nsProfiler::GetSymbolTableMozPromise runnable on ProfSymbolTable thread", + [promiseHolder = std::move(promiseHolder), + debugPath = nsCString(aDebugPath), + breakpadID = nsCString(aBreakpadID)]() mutable { + AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING("profiler_get_symbol_table", + OTHER, debugPath); + SymbolTable symbolTable; + bool succeeded = profiler_get_symbol_table( + debugPath.get(), breakpadID.get(), &symbolTable); + if (succeeded) { + promiseHolder.Resolve(std::move(symbolTable), __func__); + } else { + promiseHolder.Reject(NS_ERROR_FAILURE, __func__); + } + })); + + if (NS_WARN_IF(NS_FAILED(rv))) { + // Get-symbol task was not dispatched and therefore won't fulfill the + // promise, we must reject the promise now. + promiseHolder.Reject(NS_ERROR_FAILURE, __func__); + } + + return promise; +} + +void nsProfiler::FinishGathering() { + MOZ_RELEASE_ASSERT(NS_IsMainThread()); + MOZ_RELEASE_ASSERT(mWriter.isSome()); + MOZ_RELEASE_ASSERT(mPromiseHolder.isSome()); + + // Close the "processes" array property. + mWriter->EndArray(); + + if (mGatheringLog) { + LogEvent([&](Json::Value& aEvent) { + aEvent.append(Json::StaticString{"Finished gathering, total size:"}); + aEvent.append(Json::Value::UInt64{mWriter->ChunkedWriteFunc().Length()}); + }); + (*mGatheringLog)[Json::StaticString{ + "profileGatheringLogEnd" TIMESTAMP_JSON_SUFFIX}] = + ProfilingLog::Timestamp(); + mWriter->StartObjectProperty("profileGatheringLog"); + { + nsAutoCString pid; + pid.AppendInt(int64_t(profiler_current_process_id().ToNumber())); + Json::String logString = ToCompactString(*mGatheringLog); + mGatheringLog = nullptr; + mWriter->SplicedJSONProperty(pid, logString); + } + mWriter->EndObject(); + } + + // Close the root object of the generated JSON. + mWriter->End(); + + if (const char* failure = mWriter->GetFailure(); failure) { +#ifndef ANDROID + fprintf(stderr, "JSON generation failure: %s", failure); +#else + __android_log_print(ANDROID_LOG_INFO, "GeckoProfiler", + "JSON generation failure: %s", failure); +#endif + NS_WARNING("Error during JSON generation, probably OOM."); + ResetGathering(NS_ERROR_OUT_OF_MEMORY); + return; + } + + // And try to resolve the promise with the profile JSON. + const size_t len = mWriter->ChunkedWriteFunc().Length(); + if (len >= scLengthMax) { + NS_WARNING("Profile JSON is too big to fit in a string."); + ResetGathering(NS_ERROR_FILE_TOO_BIG); + return; + } + + nsCString result; + if (!result.SetLength(len, fallible)) { + NS_WARNING("Cannot allocate a string for the Profile JSON."); + ResetGathering(NS_ERROR_OUT_OF_MEMORY); + return; + } + MOZ_ASSERT(*(result.Data() + len) == '\0', + "We expected a null at the end of the string buffer, to be " + "rewritten by CopyDataIntoLazilyAllocatedBuffer"); + + char* const resultBeginWriting = result.BeginWriting(); + if (!resultBeginWriting) { + NS_WARNING("Cannot access the string to write the Profile JSON."); + ResetGathering(NS_ERROR_CACHE_WRITE_ACCESS_DENIED); + return; + } + + // Here, we have enough space reserved in `result`, starting at + // `resultBeginWriting`, copy the JSON profile there. + if (!mWriter->ChunkedWriteFunc().CopyDataIntoLazilyAllocatedBuffer( + [&](size_t aBufferLen) -> char* { + MOZ_RELEASE_ASSERT(aBufferLen == len + 1); + return resultBeginWriting; + })) { + NS_WARNING("Could not copy profile JSON, probably OOM."); + ResetGathering(NS_ERROR_FILE_TOO_BIG); + return; + } + MOZ_ASSERT(*(result.Data() + len) == '\0', + "We still expected a null at the end of the string buffer"); + + mPromiseHolder->Resolve(std::move(result), __func__); + + ResetGathering(NS_ERROR_UNEXPECTED); +} + +void nsProfiler::ResetGathering(nsresult aPromiseRejectionIfPending) { + // If we have an unfulfilled Promise in flight, we should reject it before + // destroying the promise holder. + if (mPromiseHolder.isSome()) { + mPromiseHolder->RejectIfExists(aPromiseRejectionIfPending, __func__); + mPromiseHolder.reset(); + } + mPendingProfiles.clearAndFree(); + mGathering = false; + mGatheringLog = nullptr; + if (mGatheringTimer) { + mGatheringTimer->Cancel(); + mGatheringTimer = nullptr; + } + mWriter.reset(); + mFailureLatchSource.reset(); +} |