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tubestation/toolkit/components/telemetry/TelemetryHistogram.cpp

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/* -*- Mode: C++; tab-width: 8; 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 "jsapi.h"
#include "jsfriendapi.h"
#include "js/GCAPI.h"
#include "nsString.h"
#include "nsTHashtable.h"
#include "nsHashKeys.h"
#include "nsBaseHashtable.h"
#include "nsClassHashtable.h"
#include "nsITelemetry.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/Atomics.h"
#include "mozilla/StartupTimeline.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/Unused.h"
#include "TelemetryCommon.h"
#include "TelemetryHistogram.h"
#include "ipc/TelemetryIPCAccumulator.h"
#include "base/histogram.h"
using base::Histogram;
using base::BooleanHistogram;
using base::CountHistogram;
using base::FlagHistogram;
using base::LinearHistogram;
using mozilla::StaticMutex;
using mozilla::StaticMutexAutoLock;
using mozilla::Telemetry::Accumulation;
using mozilla::Telemetry::KeyedAccumulation;
using mozilla::Telemetry::HistogramID;
using mozilla::Telemetry::ProcessID;
using mozilla::Telemetry::HistogramCount;
using mozilla::Telemetry::Common::LogToBrowserConsole;
using mozilla::Telemetry::Common::RecordedProcessType;
using mozilla::Telemetry::Common::AutoHashtable;
using mozilla::Telemetry::Common::GetNameForProcessID;
using mozilla::Telemetry::Common::IsExpiredVersion;
using mozilla::Telemetry::Common::CanRecordDataset;
using mozilla::Telemetry::Common::IsInDataset;
namespace TelemetryIPCAccumulator = mozilla::TelemetryIPCAccumulator;
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// Naming: there are two kinds of functions in this file:
//
// * Functions named internal_*: these can only be reached via an
// interface function (TelemetryHistogram::*). They mostly expect
// the interface function to have acquired
// |gTelemetryHistogramMutex|, so they do not have to be
// thread-safe. However, those internal_* functions that are
// reachable from internal_WrapAndReturnHistogram and
// internal_WrapAndReturnKeyedHistogram can sometimes be called
// without |gTelemetryHistogramMutex|, and so might be racey.
//
// * Functions named TelemetryHistogram::*. This is the external interface.
// Entries and exits to these functions are serialised using
// |gTelemetryHistogramMutex|, except for GetKeyedHistogramSnapshots and
// CreateHistogramSnapshots.
//
// Avoiding races and deadlocks:
//
// All functions in the external interface (TelemetryHistogram::*) are
// serialised using the mutex |gTelemetryHistogramMutex|. This means
// that the external interface is thread-safe, and many of the
// internal_* functions can ignore thread safety. But it also brings
// a danger of deadlock if any function in the external interface can
// get back to that interface. That is, we will deadlock on any call
// chain like this
//
// TelemetryHistogram::* -> .. any functions .. -> TelemetryHistogram::*
//
// To reduce the danger of that happening, observe the following rules:
//
// * No function in TelemetryHistogram::* may directly call, nor take the
// address of, any other function in TelemetryHistogram::*.
//
// * No internal function internal_* may call, nor take the address
// of, any function in TelemetryHistogram::*.
//
// internal_WrapAndReturnHistogram and
// internal_WrapAndReturnKeyedHistogram are not protected by
// |gTelemetryHistogramMutex| because they make calls to the JS
// engine, but that can in turn call back to Telemetry and hence back
// to a TelemetryHistogram:: function, in order to report GC and other
// statistics. This would lead to deadlock due to attempted double
// acquisition of |gTelemetryHistogramMutex|, if the internal_* functions
// were required to be protected by |gTelemetryHistogramMutex|. To
// break that cycle, we relax that requirement. Unfortunately this
// means that this file is not guaranteed race-free.
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE TYPES
namespace {
typedef nsDataHashtable<nsCStringHashKey, HistogramID> StringToHistogramIdMap;
// Hardcoded probes
struct HistogramInfo {
uint32_t min;
uint32_t max;
uint32_t bucketCount;
uint32_t histogramType;
uint32_t name_offset;
uint32_t expiration_offset;
uint32_t dataset;
uint32_t label_index;
uint32_t label_count;
RecordedProcessType record_in_processes;
bool keyed;
const char *name() const;
const char *expiration() const;
nsresult label_id(const char* label, uint32_t* labelId) const;
};
enum reflectStatus {
REFLECT_OK,
REFLECT_FAILURE
};
enum class SessionType {
Session = 0,
Subsession = 1,
Count,
};
class KeyedHistogram {
public:
KeyedHistogram(HistogramID id, const HistogramInfo& info);
~KeyedHistogram();
nsresult GetHistogram(const nsCString& name, Histogram** histogram, bool subsession);
Histogram* GetHistogram(const nsCString& name, bool subsession);
uint32_t GetHistogramType() const { return mHistogramInfo.histogramType; }
nsresult GetJSKeys(JSContext* cx, JS::CallArgs& args);
nsresult GetJSSnapshot(JSContext* cx, JS::Handle<JSObject*> obj,
bool subsession, bool clearSubsession);
nsresult Add(const nsCString& key, uint32_t aSample, ProcessID aProcessType);
void Clear(bool subsession);
HistogramID GetHistogramID() const { return mId; }
private:
typedef nsBaseHashtableET<nsCStringHashKey, Histogram*> KeyedHistogramEntry;
typedef AutoHashtable<KeyedHistogramEntry> KeyedHistogramMapType;
KeyedHistogramMapType mHistogramMap;
#if !defined(MOZ_WIDGET_ANDROID)
KeyedHistogramMapType mSubsessionMap;
#endif
static bool ReflectKeyedHistogram(KeyedHistogramEntry* entry,
JSContext* cx,
JS::Handle<JSObject*> obj);
const HistogramID mId;
const HistogramInfo& mHistogramInfo;
};
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE STATE, SHARED BY ALL THREADS
namespace {
// Set to true once this global state has been initialized
bool gInitDone = false;
// Whether we are collecting the base, opt-out, Histogram data.
bool gCanRecordBase = false;
// Whether we are collecting the extended, opt-in, Histogram data.
bool gCanRecordExtended = false;
// The storage for actual Histogram instances.
// We use separate ones for plain and keyed histograms.
Histogram* gHistogramStorage[HistogramCount][uint32_t(ProcessID::Count)][uint32_t(SessionType::Count)] = {};
// Keyed histograms internally map string keys to individual Histogram instances.
// KeyedHistogram keeps track of session & subsession histograms internally.
KeyedHistogram* gKeyedHistogramStorage[HistogramCount][uint32_t(ProcessID::Count)] = {};
// Cache of histogram name to a histogram id.
StringToHistogramIdMap gNameToHistogramIDMap(HistogramCount);
// To simplify logic below we use a single histogram instance for all expired histograms.
Histogram* gExpiredHistogram = nullptr;
// This tracks whether recording is enabled for specific histograms.
// To utilize C++ initialization rules, we invert the meaning to "disabled".
bool gHistogramRecordingDisabled[HistogramCount] = {};
// This is for gHistogramInfos, gHistogramStringTable
#include "TelemetryHistogramData.inc"
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE CONSTANTS
namespace {
// List of histogram IDs which should have recording disabled initially.
const HistogramID kRecordingInitiallyDisabledIDs[] = {
mozilla::Telemetry::FX_REFRESH_DRIVER_SYNC_SCROLL_FRAME_DELAY_MS,
// The array must not be empty. Leave these item here.
mozilla::Telemetry::TELEMETRY_TEST_COUNT_INIT_NO_RECORD,
mozilla::Telemetry::TELEMETRY_TEST_KEYED_COUNT_INIT_NO_RECORD
};
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// The core storage access functions.
// They wrap access to the histogram storage and lookup caches.
namespace {
// Factory function for histogram instances.
Histogram*
internal_CreateHistogramInstance(const HistogramInfo& info);
bool
internal_IsHistogramEnumId(HistogramID aID)
{
static_assert(((HistogramID)-1 > 0), "ID should be unsigned.");
return aID < HistogramCount;
}
// Look up a plain histogram by id.
Histogram*
internal_GetHistogramById(HistogramID histogramId, ProcessID processId, SessionType sessionType,
bool instantiate = true)
{
MOZ_ASSERT(internal_IsHistogramEnumId(histogramId));
MOZ_ASSERT(!gHistogramInfos[histogramId].keyed);
MOZ_ASSERT(processId < ProcessID::Count);
MOZ_ASSERT(sessionType < SessionType::Count);
Histogram* h = gHistogramStorage[histogramId][uint32_t(processId)][uint32_t(sessionType)];
if (h || !instantiate) {
return h;
}
const HistogramInfo& info = gHistogramInfos[histogramId];
h = internal_CreateHistogramInstance(info);
MOZ_ASSERT(h);
gHistogramStorage[histogramId][uint32_t(processId)][uint32_t(sessionType)] = h;
return h;
}
// Look up a keyed histogram by id.
KeyedHistogram*
internal_GetKeyedHistogramById(HistogramID histogramId, ProcessID processId,
bool instantiate = true)
{
MOZ_ASSERT(internal_IsHistogramEnumId(histogramId));
MOZ_ASSERT(gHistogramInfos[histogramId].keyed);
MOZ_ASSERT(processId < ProcessID::Count);
KeyedHistogram* kh = gKeyedHistogramStorage[histogramId][uint32_t(processId)];
if (kh || !instantiate) {
return kh;
}
const HistogramInfo& info = gHistogramInfos[histogramId];
kh = new KeyedHistogram(histogramId, info);
gKeyedHistogramStorage[histogramId][uint32_t(processId)] = kh;
return kh;
}
// Look up a histogram id from a histogram name.
nsresult
internal_GetHistogramIdByName(const nsACString& name, HistogramID* id)
{
const bool found = gNameToHistogramIDMap.Get(name, id);
if (!found) {
return NS_ERROR_ILLEGAL_VALUE;
}
return NS_OK;
}
// Clear a histogram from storage.
void
internal_ClearHistogramById(HistogramID histogramId, ProcessID processId, SessionType sessionType)
{
delete gHistogramStorage[histogramId][uint32_t(processId)][uint32_t(sessionType)];
gHistogramStorage[histogramId][uint32_t(processId)][uint32_t(sessionType)] = nullptr;
}
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE: Misc small helpers
namespace {
bool
internal_CanRecordBase() {
return gCanRecordBase;
}
bool
internal_CanRecordExtended() {
return gCanRecordExtended;
}
// Note: this is completely unrelated to mozilla::IsEmpty.
bool
internal_IsEmpty(const Histogram *h)
{
return h->is_empty();
}
bool
internal_IsExpired(Histogram* h)
{
return h == gExpiredHistogram;
}
void
internal_SetHistogramRecordingEnabled(HistogramID id, bool aEnabled)
{
MOZ_ASSERT(internal_IsHistogramEnumId(id));
gHistogramRecordingDisabled[id] = !aEnabled;
}
bool
internal_IsRecordingEnabled(HistogramID id)
{
MOZ_ASSERT(internal_IsHistogramEnumId(id));
return !gHistogramRecordingDisabled[id];
}
nsresult
internal_GetRegisteredHistogramIds(bool keyed, uint32_t dataset,
uint32_t *aCount, char*** aHistograms)
{
nsTArray<char*> collection;
for (const auto & h : gHistogramInfos) {
if (IsExpiredVersion(h.expiration()) ||
h.keyed != keyed ||
!IsInDataset(h.dataset, dataset)) {
continue;
}
const char* id = h.name();
const size_t len = strlen(id);
collection.AppendElement(static_cast<char*>(nsMemory::Clone(id, len+1)));
}
const size_t bytes = collection.Length() * sizeof(char*);
char** histograms = static_cast<char**>(moz_xmalloc(bytes));
memcpy(histograms, collection.Elements(), bytes);
*aHistograms = histograms;
*aCount = collection.Length();
return NS_OK;
}
const char *
HistogramInfo::name() const
{
return &gHistogramStringTable[this->name_offset];
}
const char *
HistogramInfo::expiration() const
{
return &gHistogramStringTable[this->expiration_offset];
}
nsresult
HistogramInfo::label_id(const char* label, uint32_t* labelId) const
{
MOZ_ASSERT(label);
MOZ_ASSERT(this->histogramType == nsITelemetry::HISTOGRAM_CATEGORICAL);
if (this->histogramType != nsITelemetry::HISTOGRAM_CATEGORICAL) {
return NS_ERROR_FAILURE;
}
for (uint32_t i = 0; i < this->label_count; ++i) {
// gHistogramLabelTable contains the indices of the label strings in the
// gHistogramStringTable.
// They are stored in-order and consecutively, from the offset label_index
// to (label_index + label_count).
uint32_t string_offset = gHistogramLabelTable[this->label_index + i];
const char* const str = &gHistogramStringTable[string_offset];
if (::strcmp(label, str) == 0) {
*labelId = i;
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE: Histogram Get, Add, Clone, Clear functions
namespace {
nsresult
internal_CheckHistogramArguments(const HistogramInfo& info)
{
if (info.histogramType != nsITelemetry::HISTOGRAM_BOOLEAN
&& info.histogramType != nsITelemetry::HISTOGRAM_FLAG
&& info.histogramType != nsITelemetry::HISTOGRAM_COUNT) {
// Sanity checks for histogram parameters.
if (info.min >= info.max) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (info.bucketCount <= 2) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (info.min < 1) {
return NS_ERROR_ILLEGAL_VALUE;
}
}
return NS_OK;
}
Histogram*
internal_CreateHistogramInstance(const HistogramInfo& passedInfo)
{
if (NS_FAILED(internal_CheckHistogramArguments(passedInfo))) {
MOZ_ASSERT(false, "Failed histogram argument checks.");
return nullptr;
}
// To keep the code simple we map all the calls to expired histograms to the same histogram instance.
// We create that instance lazily when needed.
const bool isExpired = IsExpiredVersion(passedInfo.expiration());
HistogramInfo info = passedInfo;
if (isExpired) {
if (gExpiredHistogram) {
return gExpiredHistogram;
}
info.min = 1;
info.max = 2;
info.bucketCount = 3;
info.histogramType = nsITelemetry::HISTOGRAM_LINEAR;
}
Histogram::Flags flags = Histogram::kNoFlags;
Histogram* h = nullptr;
switch (info.histogramType) {
case nsITelemetry::HISTOGRAM_EXPONENTIAL:
h = Histogram::FactoryGet(info.min, info.max, info.bucketCount, flags);
break;
case nsITelemetry::HISTOGRAM_LINEAR:
case nsITelemetry::HISTOGRAM_CATEGORICAL:
h = LinearHistogram::FactoryGet(info.min, info.max, info.bucketCount, flags);
break;
case nsITelemetry::HISTOGRAM_BOOLEAN:
h = BooleanHistogram::FactoryGet(flags);
break;
case nsITelemetry::HISTOGRAM_FLAG:
h = FlagHistogram::FactoryGet(flags);
break;
case nsITelemetry::HISTOGRAM_COUNT:
h = CountHistogram::FactoryGet(flags);
break;
default:
MOZ_ASSERT(false, "Invalid histogram type");
return nullptr;
}
if (isExpired) {
gExpiredHistogram = h;
}
return h;
}
nsresult
internal_HistogramAdd(Histogram& histogram,
const HistogramID id,
int32_t value,
ProcessID aProcessType)
{
// Check if we are allowed to record the data.
bool canRecordDataset = CanRecordDataset(gHistogramInfos[id].dataset,
internal_CanRecordBase(),
internal_CanRecordExtended());
// If `histogram` is a non-parent-process histogram, then recording-enabled
// has been checked in its owner process.
if (!canRecordDataset ||
(aProcessType == ProcessID::Parent && !internal_IsRecordingEnabled(id))) {
return NS_OK;
}
// It is safe to add to the histogram now: the subsession histogram was already
// cloned from this so we won't add the sample twice.
histogram.Add(value);
return NS_OK;
}
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE: Histogram reflection helpers
namespace {
bool
internal_FillRanges(JSContext *cx, JS::Handle<JSObject*> array, Histogram *h)
{
JS::Rooted<JS::Value> range(cx);
for (size_t i = 0; i < h->bucket_count(); i++) {
range.setInt32(h->ranges(i));
if (!JS_DefineElement(cx, array, i, range, JSPROP_ENUMERATE))
return false;
}
return true;
}
enum reflectStatus
internal_ReflectHistogramAndSamples(JSContext *cx,
JS::Handle<JSObject*> obj, Histogram *h,
const Histogram::SampleSet &ss)
{
if (!(JS_DefineProperty(cx, obj, "min",
h->declared_min(), JSPROP_ENUMERATE)
&& JS_DefineProperty(cx, obj, "max",
h->declared_max(), JSPROP_ENUMERATE)
&& JS_DefineProperty(cx, obj, "histogram_type",
h->histogram_type(), JSPROP_ENUMERATE)
&& JS_DefineProperty(cx, obj, "sum",
double(ss.sum()), JSPROP_ENUMERATE))) {
return REFLECT_FAILURE;
}
const size_t count = h->bucket_count();
JS::Rooted<JSObject*> rarray(cx, JS_NewArrayObject(cx, count));
if (!rarray) {
return REFLECT_FAILURE;
}
if (!(internal_FillRanges(cx, rarray, h)
&& JS_DefineProperty(cx, obj, "ranges", rarray, JSPROP_ENUMERATE))) {
return REFLECT_FAILURE;
}
JS::Rooted<JSObject*> counts_array(cx, JS_NewArrayObject(cx, count));
if (!counts_array) {
return REFLECT_FAILURE;
}
if (!JS_DefineProperty(cx, obj, "counts", counts_array, JSPROP_ENUMERATE)) {
return REFLECT_FAILURE;
}
for (size_t i = 0; i < count; i++) {
if (!JS_DefineElement(cx, counts_array, i,
ss.counts(i), JSPROP_ENUMERATE)) {
return REFLECT_FAILURE;
}
}
return REFLECT_OK;
}
enum reflectStatus
internal_ReflectHistogramSnapshot(JSContext *cx,
JS::Handle<JSObject*> obj, Histogram *h)
{
Histogram::SampleSet ss;
h->SnapshotSample(&ss);
return internal_ReflectHistogramAndSamples(cx, obj, h, ss);
}
bool
internal_ShouldReflectHistogram(Histogram* h, HistogramID id)
{
// Only flag histograms are serialized when they are empty.
// This has historical reasons, changing this will require downstream changes.
// The cheaper path here is to just deprecate flag histograms in favor
// of scalars.
uint32_t type = gHistogramInfos[id].histogramType;
if (internal_IsEmpty(h) && type != nsITelemetry::HISTOGRAM_FLAG) {
return false;
}
return true;
}
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE: class KeyedHistogram
namespace {
KeyedHistogram::KeyedHistogram(HistogramID id, const HistogramInfo& info)
: mHistogramMap()
#if !defined(MOZ_WIDGET_ANDROID)
, mSubsessionMap()
#endif
, mId(id)
, mHistogramInfo(info)
{
}
KeyedHistogram::~KeyedHistogram()
{
for (auto iter = mHistogramMap.Iter(); !iter.Done(); iter.Next()) {
Histogram* h = iter.Get()->mData;
if (h == gExpiredHistogram) {
continue;
}
delete h;
}
mHistogramMap.Clear();
#if !defined(MOZ_WIDGET_ANDROID)
for (auto iter = mSubsessionMap.Iter(); !iter.Done(); iter.Next()) {
Histogram* h = iter.Get()->mData;
if (h == gExpiredHistogram) {
continue;
}
delete h;
}
mSubsessionMap.Clear();
#endif
}
nsresult
KeyedHistogram::GetHistogram(const nsCString& key, Histogram** histogram,
bool subsession)
{
#if !defined(MOZ_WIDGET_ANDROID)
KeyedHistogramMapType& map = subsession ? mSubsessionMap : mHistogramMap;
#else
KeyedHistogramMapType& map = mHistogramMap;
#endif
KeyedHistogramEntry* entry = map.GetEntry(key);
if (entry) {
*histogram = entry->mData;
return NS_OK;
}
Histogram* h = internal_CreateHistogramInstance(mHistogramInfo);
if (!h) {
return NS_ERROR_FAILURE;
}
h->ClearFlags(Histogram::kUmaTargetedHistogramFlag);
*histogram = h;
entry = map.PutEntry(key);
if (MOZ_UNLIKELY(!entry)) {
return NS_ERROR_OUT_OF_MEMORY;
}
entry->mData = h;
return NS_OK;
}
Histogram*
KeyedHistogram::GetHistogram(const nsCString& key, bool subsession)
{
Histogram* h = nullptr;
if (NS_FAILED(GetHistogram(key, &h, subsession))) {
return nullptr;
}
return h;
}
nsresult
KeyedHistogram::Add(const nsCString& key, uint32_t sample,
ProcessID aProcessType)
{
bool canRecordDataset = CanRecordDataset(mHistogramInfo.dataset,
internal_CanRecordBase(),
internal_CanRecordExtended());
// If `histogram` is a non-parent-process histogram, then recording-enabled
// has been checked in its owner process.
if (!canRecordDataset ||
(aProcessType == ProcessID::Parent && !internal_IsRecordingEnabled(mId))) {
return NS_OK;
}
Histogram* histogram = GetHistogram(key, false);
MOZ_ASSERT(histogram);
if (!histogram) {
return NS_ERROR_FAILURE;
}
#if !defined(MOZ_WIDGET_ANDROID)
Histogram* subsession = GetHistogram(key, true);
MOZ_ASSERT(subsession);
if (!subsession) {
return NS_ERROR_FAILURE;
}
#endif
histogram->Add(sample);
#if !defined(MOZ_WIDGET_ANDROID)
subsession->Add(sample);
#endif
return NS_OK;
}
void
KeyedHistogram::Clear(bool onlySubsession)
{
MOZ_ASSERT(XRE_IsParentProcess());
if (!XRE_IsParentProcess()) {
return;
}
#if !defined(MOZ_WIDGET_ANDROID)
for (auto iter = mSubsessionMap.Iter(); !iter.Done(); iter.Next()) {
Histogram* h = iter.Get()->mData;
if (h == gExpiredHistogram) {
continue;
}
delete h;
}
mSubsessionMap.Clear();
if (onlySubsession) {
return;
}
#endif
for (auto iter = mHistogramMap.Iter(); !iter.Done(); iter.Next()) {
Histogram* h = iter.Get()->mData;
if (h == gExpiredHistogram) {
continue;
}
delete h;
}
mHistogramMap.Clear();
}
nsresult
KeyedHistogram::GetJSKeys(JSContext* cx, JS::CallArgs& args)
{
JS::AutoValueVector keys(cx);
if (!keys.reserve(mHistogramMap.Count())) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (auto iter = mHistogramMap.Iter(); !iter.Done(); iter.Next()) {
JS::RootedValue jsKey(cx);
const NS_ConvertUTF8toUTF16 key(iter.Get()->GetKey());
jsKey.setString(JS_NewUCStringCopyN(cx, key.Data(), key.Length()));
if (!keys.append(jsKey)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
JS::RootedObject jsKeys(cx, JS_NewArrayObject(cx, keys));
if (!jsKeys) {
return NS_ERROR_FAILURE;
}
args.rval().setObject(*jsKeys);
return NS_OK;
}
bool
KeyedHistogram::ReflectKeyedHistogram(KeyedHistogramEntry* entry,
JSContext* cx, JS::Handle<JSObject*> obj)
{
JS::RootedObject histogramSnapshot(cx, JS_NewPlainObject(cx));
if (!histogramSnapshot) {
return false;
}
if (internal_ReflectHistogramSnapshot(cx, histogramSnapshot,
entry->mData) != REFLECT_OK) {
return false;
}
const NS_ConvertUTF8toUTF16 key(entry->GetKey());
if (!JS_DefineUCProperty(cx, obj, key.Data(), key.Length(),
histogramSnapshot, JSPROP_ENUMERATE)) {
return false;
}
return true;
}
nsresult
KeyedHistogram::GetJSSnapshot(JSContext* cx, JS::Handle<JSObject*> obj,
bool subsession, bool clearSubsession)
{
#if !defined(MOZ_WIDGET_ANDROID)
KeyedHistogramMapType& map = subsession ? mSubsessionMap : mHistogramMap;
#else
KeyedHistogramMapType& map = mHistogramMap;
#endif
if (!map.ReflectIntoJS(&KeyedHistogram::ReflectKeyedHistogram, cx, obj)) {
return NS_ERROR_FAILURE;
}
#if !defined(MOZ_WIDGET_ANDROID)
if (subsession && clearSubsession) {
Clear(true);
}
#endif
return NS_OK;
}
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE: thread-unsafe helpers for the external interface
// This is a StaticMutex rather than a plain Mutex (1) so that
// it gets initialised in a thread-safe manner the first time
// it is used, and (2) because it is never de-initialised, and
// a normal Mutex would show up as a leak in BloatView. StaticMutex
// also has the "OffTheBooks" property, so it won't show as a leak
// in BloatView.
static StaticMutex gTelemetryHistogramMutex;
namespace {
bool
internal_RemoteAccumulate(HistogramID aId, uint32_t aSample)
{
if (XRE_IsParentProcess()) {
return false;
}
if (!internal_IsRecordingEnabled(aId)) {
return true;
}
TelemetryIPCAccumulator::AccumulateChildHistogram(aId, aSample);
return true;
}
bool
internal_RemoteAccumulate(HistogramID aId,
const nsCString& aKey, uint32_t aSample)
{
if (XRE_IsParentProcess()) {
return false;
}
if (!internal_IsRecordingEnabled(aId)) {
return true;
}
TelemetryIPCAccumulator::AccumulateChildKeyedHistogram(aId, aKey, aSample);
return true;
}
void internal_Accumulate(HistogramID aId, uint32_t aSample)
{
if (!internal_CanRecordBase() ||
internal_RemoteAccumulate(aId, aSample)) {
return;
}
Histogram *h = internal_GetHistogramById(aId, ProcessID::Parent, SessionType::Session);
MOZ_ASSERT(h);
internal_HistogramAdd(*h, aId, aSample, ProcessID::Parent);
#if !defined(MOZ_WIDGET_ANDROID)
h = internal_GetHistogramById(aId, ProcessID::Parent, SessionType::Subsession);
MOZ_ASSERT(h);
internal_HistogramAdd(*h, aId, aSample, ProcessID::Parent);
#endif
}
void
internal_Accumulate(HistogramID aId,
const nsCString& aKey, uint32_t aSample)
{
if (!gInitDone || !internal_CanRecordBase() ||
internal_RemoteAccumulate(aId, aKey, aSample)) {
return;
}
KeyedHistogram* keyed = internal_GetKeyedHistogramById(aId, ProcessID::Parent);
MOZ_ASSERT(keyed);
keyed->Add(aKey, aSample, ProcessID::Parent);
}
void
internal_AccumulateChild(ProcessID aProcessType, HistogramID aId, uint32_t aSample)
{
if (!internal_CanRecordBase()) {
return;
}
if (Histogram* h = internal_GetHistogramById(aId, aProcessType, SessionType::Session)) {
internal_HistogramAdd(*h, aId, aSample, aProcessType);
} else {
NS_WARNING("Failed GetHistogramById for CHILD");
}
#if !defined(MOZ_WIDGET_ANDROID)
if (Histogram* h = internal_GetHistogramById(aId, aProcessType, SessionType::Subsession)) {
internal_HistogramAdd(*h, aId, aSample, aProcessType);
} else {
NS_WARNING("Failed GetHistogramById for CHILD");
}
#endif
}
void
internal_AccumulateChildKeyed(ProcessID aProcessType, HistogramID aId,
const nsCString& aKey, uint32_t aSample)
{
if (!gInitDone || !internal_CanRecordBase()) {
return;
}
KeyedHistogram* keyed = internal_GetKeyedHistogramById(aId, aProcessType);
MOZ_ASSERT(keyed);
keyed->Add(aKey, aSample, aProcessType);
}
void
internal_ClearHistogram(HistogramID id, bool onlySubsession)
{
MOZ_ASSERT(XRE_IsParentProcess());
if (!XRE_IsParentProcess()) {
return;
}
// Handle keyed histograms.
if (gHistogramInfos[id].keyed) {
for (uint32_t process = 0; process < static_cast<uint32_t>(ProcessID::Count); ++process) {
KeyedHistogram* kh = internal_GetKeyedHistogramById(id, static_cast<ProcessID>(process), /* instantiate = */ false);
if (kh) {
kh->Clear(onlySubsession);
}
}
}
// Handle plain histograms.
// Define the session types we want to clear.
nsTArray<SessionType> sessionTypes;
if (!onlySubsession) {
sessionTypes.AppendElement(SessionType::Session);
}
#if !defined(MOZ_WIDGET_ANDROID)
sessionTypes.AppendElement(SessionType::Subsession);
#endif
// Now reset the histograms instances for all processes.
for (SessionType sessionType : sessionTypes) {
for (uint32_t process = 0; process < static_cast<uint32_t>(ProcessID::Count); ++process) {
internal_ClearHistogramById(id,
static_cast<ProcessID>(process),
sessionType);
}
}
}
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE: JSHistogram_* functions
// NOTE: the functions in this section:
//
// internal_JSHistogram_Add
// internal_JSHistogram_Snapshot
// internal_JSHistogram_Clear
// internal_WrapAndReturnHistogram
//
// all run without protection from |gTelemetryHistogramMutex|. If they
// held |gTelemetryHistogramMutex|, there would be the possibility of
// deadlock because the JS_ calls that they make may call back into the
// TelemetryHistogram interface, hence trying to re-acquire the mutex.
//
// This means that these functions potentially race against threads, but
// that seems preferable to risking deadlock.
namespace {
void internal_JSHistogram_finalize(JSFreeOp*, JSObject*);
static const JSClassOps sJSHistogramClassOps = {
nullptr, /* addProperty */
nullptr, /* delProperty */
nullptr, /* getProperty */
nullptr, /* setProperty */
nullptr, /* enumerate */
nullptr, /* newEnumerate */
nullptr, /* resolve */
nullptr, /* mayResolve */
internal_JSHistogram_finalize
};
static const JSClass sJSHistogramClass = {
"JSHistogram", /* name */
JSCLASS_HAS_PRIVATE | JSCLASS_FOREGROUND_FINALIZE, /* flags */
&sJSHistogramClassOps
};
struct JSHistogramData {
HistogramID histogramId;
};
bool
internal_JSHistogram_Add(JSContext *cx, unsigned argc, JS::Value *vp)
{
JSObject *obj = JS_THIS_OBJECT(cx, vp);
MOZ_ASSERT(obj);
if (!obj ||
JS_GetClass(obj) != &sJSHistogramClass) {
JS_ReportErrorASCII(cx, "Wrong JS class, expected JSHistogram class");
return false;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
HistogramID id = data->histogramId;
MOZ_ASSERT(internal_IsHistogramEnumId(id));
uint32_t type = gHistogramInfos[id].histogramType;
JS::CallArgs args = CallArgsFromVp(argc, vp);
// This function should always return |undefined| and never fail but
// rather report failures using the console.
args.rval().setUndefined();
if (!internal_CanRecordBase()) {
return true;
}
uint32_t value = 0;
if ((type == nsITelemetry::HISTOGRAM_COUNT) && (args.length() == 0)) {
// If we don't have an argument for the count histogram, assume an increment of 1.
// Otherwise, make sure to run some sanity checks on the argument.
value = 1;
} else if ((args.length() > 0) && args[0].isString() &&
gHistogramInfos[id].histogramType == nsITelemetry::HISTOGRAM_CATEGORICAL) {
// For categorical histograms we allow passing a string argument that specifies the label.
nsAutoJSString label;
if (!label.init(cx, args[0])) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Invalid string parameter"));
return true;
}
// Get label id value.
nsresult rv = gHistogramInfos[id].label_id(NS_ConvertUTF16toUTF8(label).get(), &value);
if (NS_FAILED(rv)) {
LogToBrowserConsole(nsIScriptError::errorFlag,
NS_LITERAL_STRING("Unknown label for categorical histogram"));
return true;
}
} else {
// All other accumulations expect one numerical argument.
if (!args.length()) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Expected one argument"));
return true;
}
if (!(args[0].isNumber() || args[0].isBoolean())) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Not a number"));
return true;
}
if (!JS::ToUint32(cx, args[0], &value)) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Failed to convert argument"));
return true;
}
}
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
internal_Accumulate(id, value);
}
return true;
}
bool
internal_JSHistogram_Snapshot(JSContext *cx, unsigned argc, JS::Value *vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
JSObject *obj = JS_THIS_OBJECT(cx, vp);
if (!obj ||
JS_GetClass(obj) != &sJSHistogramClass) {
JS_ReportErrorASCII(cx, "Wrong JS class, expected JSHistogram class");
return false;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
HistogramID id = data->histogramId;
MOZ_ASSERT(internal_IsHistogramEnumId(id));
// This is not good standard behavior given that we have histogram instances
// covering multiple processes and two session types.
// However, changing this requires some broader changes to callers.
Histogram* h = internal_GetHistogramById(id, ProcessID::Parent, SessionType::Session);
MOZ_ASSERT(h);
JS::Rooted<JSObject*> snapshot(cx, JS_NewPlainObject(cx));
if (!snapshot) {
return false;
}
switch (internal_ReflectHistogramSnapshot(cx, snapshot, h)) {
case REFLECT_FAILURE:
return false;
case REFLECT_OK:
args.rval().setObject(*snapshot);
return true;
default:
MOZ_ASSERT_UNREACHABLE("Unhandled reflection status.");
}
return true;
}
bool
internal_JSHistogram_Clear(JSContext *cx, unsigned argc, JS::Value *vp)
{
JSObject *obj = JS_THIS_OBJECT(cx, vp);
if (!obj ||
JS_GetClass(obj) != &sJSHistogramClass) {
JS_ReportErrorASCII(cx, "Wrong JS class, expected JSHistogram class");
return false;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
HistogramID id = data->histogramId;
MOZ_ASSERT(internal_IsHistogramEnumId(id));
bool onlySubsession = false;
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
// This function should always return |undefined| and never fail but
// rather report failures using the console.
args.rval().setUndefined();
#if !defined(MOZ_WIDGET_ANDROID)
if (args.length() >= 1) {
if (!args[0].isBoolean()) {
JS_ReportErrorASCII(cx, "Not a boolean");
return false;
}
onlySubsession = JS::ToBoolean(args[0]);
}
#endif
internal_ClearHistogram(id, onlySubsession);
return true;
}
// NOTE: Runs without protection from |gTelemetryHistogramMutex|.
// See comment at the top of this section.
nsresult
internal_WrapAndReturnHistogram(HistogramID id, JSContext *cx,
JS::MutableHandle<JS::Value> ret)
{
JS::Rooted<JSObject*> obj(cx, JS_NewObject(cx, &sJSHistogramClass));
if (!obj) {
return NS_ERROR_FAILURE;
}
// The 3 functions that are wrapped up here are eventually called
// by the same thread that runs this function.
if (!(JS_DefineFunction(cx, obj, "add", internal_JSHistogram_Add, 1, 0)
&& JS_DefineFunction(cx, obj, "snapshot",
internal_JSHistogram_Snapshot, 0, 0)
&& JS_DefineFunction(cx, obj, "clear", internal_JSHistogram_Clear, 0, 0))) {
return NS_ERROR_FAILURE;
}
JSHistogramData* data = new JSHistogramData{id};
JS_SetPrivate(obj, data);
ret.setObject(*obj);
return NS_OK;
}
void
internal_JSHistogram_finalize(JSFreeOp*, JSObject* obj)
{
if (!obj ||
JS_GetClass(obj) != &sJSHistogramClass) {
MOZ_ASSERT_UNREACHABLE("Should have the right JS class.");
return;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
delete data;
}
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// PRIVATE: JSKeyedHistogram_* functions
// NOTE: the functions in this section:
//
// internal_KeyedHistogram_SnapshotImpl
// internal_JSKeyedHistogram_Add
// internal_JSKeyedHistogram_Keys
// internal_JSKeyedHistogram_Snapshot
// internal_JSKeyedHistogram_SubsessionSnapshot
// internal_JSKeyedHistogram_SnapshotSubsessionAndClear
// internal_JSKeyedHistogram_Clear
// internal_WrapAndReturnKeyedHistogram
//
// Same comments as above, at the JSHistogram_* section, regarding
// deadlock avoidance, apply.
namespace {
void internal_JSKeyedHistogram_finalize(JSFreeOp*, JSObject*);
static const JSClassOps sJSKeyedHistogramClassOps = {
nullptr, /* addProperty */
nullptr, /* delProperty */
nullptr, /* getProperty */
nullptr, /* setProperty */
nullptr, /* enumerate */
nullptr, /* newEnumerate */
nullptr, /* resolve */
nullptr, /* mayResolve */
internal_JSKeyedHistogram_finalize
};
static const JSClass sJSKeyedHistogramClass = {
"JSKeyedHistogram", /* name */
JSCLASS_HAS_PRIVATE | JSCLASS_FOREGROUND_FINALIZE, /* flags */
&sJSKeyedHistogramClassOps
};
bool
internal_KeyedHistogram_SnapshotImpl(JSContext *cx, unsigned argc,
JS::Value *vp,
bool subsession, bool clearSubsession)
{
JSObject *obj = JS_THIS_OBJECT(cx, vp);
if (!obj ||
JS_GetClass(obj) != &sJSKeyedHistogramClass) {
JS_ReportErrorASCII(cx, "Wrong JS class, expected JSKeyedHistogram class");
return false;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
HistogramID id = data->histogramId;
MOZ_ASSERT(internal_IsHistogramEnumId(id));
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
// This function should always return |undefined| and never fail but
// rather report failures using the console.
args.rval().setUndefined();
// This is not good standard behavior given that we have histogram instances
// covering multiple processes and two session types.
// However, changing this requires some broader changes to callers.
KeyedHistogram* keyed = internal_GetKeyedHistogramById(id, ProcessID::Parent, /* instantiate = */ true);
if (!keyed) {
JS_ReportErrorASCII(cx, "Failed to look up keyed histogram");
return false;
}
if (args.length() == 0) {
JS::RootedObject snapshot(cx, JS_NewPlainObject(cx));
if (!snapshot) {
JS_ReportErrorASCII(cx, "Failed to create object");
return false;
}
if (!NS_SUCCEEDED(keyed->GetJSSnapshot(cx, snapshot, subsession, clearSubsession))) {
JS_ReportErrorASCII(cx, "Failed to reflect keyed histograms");
return false;
}
args.rval().setObject(*snapshot);
return true;
}
nsAutoJSString key;
if (!args[0].isString() || !key.init(cx, args[0])) {
JS_ReportErrorASCII(cx, "Not a string");
return false;
}
Histogram* h = nullptr;
nsresult rv = keyed->GetHistogram(NS_ConvertUTF16toUTF8(key), &h, subsession);
if (NS_FAILED(rv)) {
JS_ReportErrorASCII(cx, "Failed to get histogram");
return false;
}
JS::RootedObject snapshot(cx, JS_NewPlainObject(cx));
if (!snapshot) {
return false;
}
switch (internal_ReflectHistogramSnapshot(cx, snapshot, h)) {
case REFLECT_FAILURE:
JS_ReportErrorASCII(cx, "Failed to reflect histogram");
return false;
case REFLECT_OK:
args.rval().setObject(*snapshot);
return true;
default:
MOZ_CRASH("unhandled reflection status");
}
return true;
}
bool
internal_JSKeyedHistogram_Add(JSContext *cx, unsigned argc, JS::Value *vp)
{
JSObject *obj = JS_THIS_OBJECT(cx, vp);
if (!obj ||
JS_GetClass(obj) != &sJSKeyedHistogramClass) {
JS_ReportErrorASCII(cx, "Wrong JS class, expected JSKeyedHistogram class");
return false;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
HistogramID id = data->histogramId;
MOZ_ASSERT(internal_IsHistogramEnumId(id));
JS::CallArgs args = CallArgsFromVp(argc, vp);
// This function should always return |undefined| and never fail but
// rather report failures using the console.
args.rval().setUndefined();
if (args.length() < 1) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Expected one argument"));
return true;
}
nsAutoJSString key;
if (!args[0].isString() || !key.init(cx, args[0])) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Not a string"));
return true;
}
const uint32_t type = gHistogramInfos[id].histogramType;
// If we don't have an argument for the count histogram, assume an increment of 1.
// Otherwise, make sure to run some sanity checks on the argument.
uint32_t value = 1;
if ((type != nsITelemetry::HISTOGRAM_COUNT) || (args.length() == 2)) {
if (args.length() < 2) {
LogToBrowserConsole(nsIScriptError::errorFlag,
NS_LITERAL_STRING("Expected two arguments for this histogram type"));
return true;
}
if (type == nsITelemetry::HISTOGRAM_CATEGORICAL && args[1].isString()) {
// For categorical histograms we allow passing a string argument that specifies the label.
// Get label string.
nsAutoJSString label;
if (!label.init(cx, args[1])) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Invalid string parameter"));
return true;
}
// Get label id value.
nsresult rv = gHistogramInfos[id].label_id(NS_ConvertUTF16toUTF8(label).get(), &value);
if (NS_FAILED(rv)) {
LogToBrowserConsole(nsIScriptError::errorFlag,
NS_LITERAL_STRING("Unknown label for categorical histogram"));
return true;
}
} else {
// All other accumulations expect one numerical argument.
if (!(args[1].isNumber() || args[1].isBoolean())) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Not a number"));
return true;
}
if (!JS::ToUint32(cx, args[1], &value)) {
LogToBrowserConsole(nsIScriptError::errorFlag, NS_LITERAL_STRING("Failed to convert argument"));
return true;
}
}
}
internal_Accumulate(id, NS_ConvertUTF16toUTF8(key), value);
return true;
}
bool
internal_JSKeyedHistogram_Keys(JSContext *cx, unsigned argc, JS::Value *vp)
{
JSObject *obj = JS_THIS_OBJECT(cx, vp);
if (!obj ||
JS_GetClass(obj) != &sJSKeyedHistogramClass) {
JS_ReportErrorASCII(cx, "Wrong JS class, expected JSKeyedHistogram class");
return false;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
HistogramID id = data->histogramId;
MOZ_ASSERT(internal_IsHistogramEnumId(id));
// This is not good standard behavior given that we have histogram instances
// covering multiple processes and two session types.
// However, changing this requires some broader changes to callers.
KeyedHistogram* keyed = internal_GetKeyedHistogramById(id, ProcessID::Parent);
MOZ_ASSERT(keyed);
if (!keyed) {
return false;
}
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
return NS_SUCCEEDED(keyed->GetJSKeys(cx, args));
}
bool
internal_JSKeyedHistogram_Snapshot(JSContext *cx, unsigned argc, JS::Value *vp)
{
return internal_KeyedHistogram_SnapshotImpl(cx, argc, vp, false, false);
}
#if !defined(MOZ_WIDGET_ANDROID)
bool
internal_JSKeyedHistogram_SubsessionSnapshot(JSContext *cx,
unsigned argc, JS::Value *vp)
{
return internal_KeyedHistogram_SnapshotImpl(cx, argc, vp, true, false);
}
#endif
#if !defined(MOZ_WIDGET_ANDROID)
bool
internal_JSKeyedHistogram_SnapshotSubsessionAndClear(JSContext *cx,
unsigned argc,
JS::Value *vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
if (args.length() != 0) {
JS_ReportErrorASCII(cx, "No key arguments supported for snapshotSubsessionAndClear");
}
return internal_KeyedHistogram_SnapshotImpl(cx, argc, vp, true, true);
}
#endif
bool
internal_JSKeyedHistogram_Clear(JSContext *cx, unsigned argc, JS::Value *vp)
{
JSObject *obj = JS_THIS_OBJECT(cx, vp);
if (!obj ||
JS_GetClass(obj) != &sJSKeyedHistogramClass) {
JS_ReportErrorASCII(cx, "Wrong JS class, expected JSKeyedHistogram class");
return false;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
HistogramID id = data->histogramId;
MOZ_ASSERT(internal_IsHistogramEnumId(id));
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
// This function should always return |undefined| and never fail but
// rather report failures using the console.
args.rval().setUndefined();
// This is not good standard behavior given that we have histogram instances
// covering multiple processes and two session types.
// However, changing this requires some broader changes to callers.
KeyedHistogram* keyed = internal_GetKeyedHistogramById(id, ProcessID::Parent, /* instantiate = */ false);
if (!keyed) {
return true;
}
#if !defined(MOZ_WIDGET_ANDROID)
bool onlySubsession = false;
if (args.length() >= 1) {
if (!(args[0].isNumber() || args[0].isBoolean())) {
JS_ReportErrorASCII(cx, "Not a boolean");
return false;
}
onlySubsession = JS::ToBoolean(args[0]);
}
keyed->Clear(onlySubsession);
#else
keyed->Clear(false);
#endif
return true;
}
// NOTE: Runs without protection from |gTelemetryHistogramMutex|.
// See comment at the top of this section.
nsresult
internal_WrapAndReturnKeyedHistogram(HistogramID id, JSContext *cx,
JS::MutableHandle<JS::Value> ret)
{
JS::Rooted<JSObject*> obj(cx, JS_NewObject(cx, &sJSKeyedHistogramClass));
if (!obj)
return NS_ERROR_FAILURE;
// The 6 functions that are wrapped up here are eventually called
// by the same thread that runs this function.
if (!(JS_DefineFunction(cx, obj, "add", internal_JSKeyedHistogram_Add, 2, 0)
&& JS_DefineFunction(cx, obj, "snapshot",
internal_JSKeyedHistogram_Snapshot, 1, 0)
#if !defined(MOZ_WIDGET_ANDROID)
&& JS_DefineFunction(cx, obj, "subsessionSnapshot",
internal_JSKeyedHistogram_SubsessionSnapshot, 1, 0)
&& JS_DefineFunction(cx, obj, "snapshotSubsessionAndClear",
internal_JSKeyedHistogram_SnapshotSubsessionAndClear, 0, 0)
#endif
&& JS_DefineFunction(cx, obj, "keys",
internal_JSKeyedHistogram_Keys, 0, 0)
&& JS_DefineFunction(cx, obj, "clear",
internal_JSKeyedHistogram_Clear, 0, 0))) {
return NS_ERROR_FAILURE;
}
JSHistogramData* data = new JSHistogramData{id};
JS_SetPrivate(obj, data);
ret.setObject(*obj);
return NS_OK;
}
void
internal_JSKeyedHistogram_finalize(JSFreeOp*, JSObject* obj)
{
if (!obj ||
JS_GetClass(obj) != &sJSKeyedHistogramClass) {
MOZ_ASSERT_UNREACHABLE("Should have the right JS class.");
return;
}
JSHistogramData* data = static_cast<JSHistogramData*>(JS_GetPrivate(obj));
MOZ_ASSERT(data);
delete data;
}
} // namespace
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
//
// EXTERNALLY VISIBLE FUNCTIONS in namespace TelemetryHistogram::
// All of these functions are actually in namespace TelemetryHistogram::,
// but the ::TelemetryHistogram prefix is given explicitly. This is
// because it is critical to see which calls from these functions are
// to another function in this interface. Mis-identifying "inwards
// calls" from "calls to another function in this interface" will lead
// to deadlocking and/or races. See comments at the top of the file
// for further (important!) details.
void TelemetryHistogram::InitializeGlobalState(bool canRecordBase,
bool canRecordExtended)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
MOZ_ASSERT(!gInitDone, "TelemetryHistogram::InitializeGlobalState "
"may only be called once");
gCanRecordBase = canRecordBase;
gCanRecordExtended = canRecordExtended;
// gNameToHistogramIDMap should have been pre-sized correctly at the
// declaration point further up in this file.
// Populate the static histogram name->id cache.
// Note that the histogram names are statically allocated.
for (uint32_t i = 0; i < HistogramCount; i++) {
gNameToHistogramIDMap.Put(nsDependentCString(gHistogramInfos[i].name()), HistogramID(i));
}
#ifdef DEBUG
gNameToHistogramIDMap.MarkImmutable();
#endif
// Some Telemetry histograms depend on the value of C++ constants and hardcode
// their values in Histograms.json.
// We add static asserts here for those values to match so that future changes
// don't go unnoticed.
static_assert((JS::gcreason::NUM_TELEMETRY_REASONS + 1) ==
gHistogramInfos[mozilla::Telemetry::GC_MINOR_REASON].bucketCount &&
(JS::gcreason::NUM_TELEMETRY_REASONS + 1) ==
gHistogramInfos[mozilla::Telemetry::GC_MINOR_REASON_LONG].bucketCount &&
(JS::gcreason::NUM_TELEMETRY_REASONS + 1) ==
gHistogramInfos[mozilla::Telemetry::GC_REASON_2].bucketCount,
"NUM_TELEMETRY_REASONS is assumed to be a fixed value in Histograms.json."
" If this was an intentional change, update the n_values for the "
"following in Histograms.json: GC_MINOR_REASON, GC_MINOR_REASON_LONG, "
"GC_REASON_2");
static_assert((mozilla::StartupTimeline::MAX_EVENT_ID + 1) ==
gHistogramInfos[mozilla::Telemetry::STARTUP_MEASUREMENT_ERRORS].bucketCount,
"MAX_EVENT_ID is assumed to be a fixed value in Histograms.json. If this"
" was an intentional change, update the n_values for the following in "
"Histograms.json: STARTUP_MEASUREMENT_ERRORS");
gInitDone = true;
}
void TelemetryHistogram::DeInitializeGlobalState()
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
gCanRecordBase = false;
gCanRecordExtended = false;
gNameToHistogramIDMap.Clear();
gInitDone = false;
// FactoryGet `new`s Histograms for us, but requires us to manually delete.
for (size_t i = 0; i < HistogramCount; ++i) {
for (uint32_t process = 0; process < static_cast<uint32_t>(ProcessID::Count); ++process) {
delete gKeyedHistogramStorage[i][process];
gKeyedHistogramStorage[i][process] = nullptr;
for (uint32_t session = 0; session <
static_cast<uint32_t>(SessionType::Count); ++session) {
if (gHistogramStorage[i][process][session] == gExpiredHistogram) {
continue;
}
delete gHistogramStorage[i][process][session];
gHistogramStorage[i][process][session] = nullptr;
}
}
}
delete gExpiredHistogram;
gExpiredHistogram = nullptr;
}
#ifdef DEBUG
bool TelemetryHistogram::GlobalStateHasBeenInitialized() {
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
return gInitDone;
}
#endif
bool
TelemetryHistogram::CanRecordBase() {
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
return internal_CanRecordBase();
}
void
TelemetryHistogram::SetCanRecordBase(bool b) {
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
gCanRecordBase = b;
}
bool
TelemetryHistogram::CanRecordExtended() {
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
return internal_CanRecordExtended();
}
void
TelemetryHistogram::SetCanRecordExtended(bool b) {
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
gCanRecordExtended = b;
}
void
TelemetryHistogram::InitHistogramRecordingEnabled()
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
auto processType = XRE_GetProcessType();
for (size_t i = 0; i < HistogramCount; ++i) {
const HistogramInfo& h = gHistogramInfos[i];
mozilla::Telemetry::HistogramID id = mozilla::Telemetry::HistogramID(i);
internal_SetHistogramRecordingEnabled(id,
CanRecordInProcess(h.record_in_processes,
processType));
}
for (auto recordingInitiallyDisabledID : kRecordingInitiallyDisabledIDs) {
internal_SetHistogramRecordingEnabled(recordingInitiallyDisabledID,
false);
}
}
void
TelemetryHistogram::SetHistogramRecordingEnabled(HistogramID aID,
bool aEnabled)
{
if (NS_WARN_IF(!internal_IsHistogramEnumId(aID))) {
MOZ_ASSERT_UNREACHABLE("Histogram usage requires valid ids.");
return;
}
const HistogramInfo& h = gHistogramInfos[aID];
if (!CanRecordInProcess(h.record_in_processes, XRE_GetProcessType())) {
// Don't permit record_in_process-disabled recording to be re-enabled.
return;
}
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
internal_SetHistogramRecordingEnabled(aID, aEnabled);
}
nsresult
TelemetryHistogram::SetHistogramRecordingEnabled(const nsACString& name,
bool aEnabled)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
HistogramID id;
if (NS_FAILED(internal_GetHistogramIdByName(name, &id))) {
return NS_ERROR_FAILURE;
}
const HistogramInfo& hi = gHistogramInfos[id];
if (CanRecordInProcess(hi.record_in_processes, XRE_GetProcessType())) {
internal_SetHistogramRecordingEnabled(id, aEnabled);
}
return NS_OK;
}
void
TelemetryHistogram::Accumulate(HistogramID aID,
uint32_t aSample)
{
if (NS_WARN_IF(!internal_IsHistogramEnumId(aID))) {
MOZ_ASSERT_UNREACHABLE("Histogram usage requires valid ids.");
return;
}
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
internal_Accumulate(aID, aSample);
}
void
TelemetryHistogram::Accumulate(HistogramID aID,
const nsCString& aKey, uint32_t aSample)
{
if (NS_WARN_IF(!internal_IsHistogramEnumId(aID))) {
MOZ_ASSERT_UNREACHABLE("Histogram usage requires valid ids.");
return;
}
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
internal_Accumulate(aID, aKey, aSample);
}
void
TelemetryHistogram::Accumulate(const char* name, uint32_t sample)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
if (!internal_CanRecordBase()) {
return;
}
HistogramID id;
nsresult rv = internal_GetHistogramIdByName(nsDependentCString(name), &id);
if (NS_FAILED(rv)) {
return;
}
internal_Accumulate(id, sample);
}
void
TelemetryHistogram::Accumulate(const char* name,
const nsCString& key, uint32_t sample)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
if (!internal_CanRecordBase()) {
return;
}
HistogramID id;
nsresult rv = internal_GetHistogramIdByName(nsDependentCString(name), &id);
if (NS_SUCCEEDED(rv)) {
internal_Accumulate(id, key, sample);
}
}
void
TelemetryHistogram::AccumulateCategorical(HistogramID aId,
const nsCString& label)
{
if (NS_WARN_IF(!internal_IsHistogramEnumId(aId))) {
MOZ_ASSERT_UNREACHABLE("Histogram usage requires valid ids.");
return;
}
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
if (!internal_CanRecordBase()) {
return;
}
uint32_t labelId = 0;
if (NS_FAILED(gHistogramInfos[aId].label_id(label.get(), &labelId))) {
return;
}
internal_Accumulate(aId, labelId);
}
void
TelemetryHistogram::AccumulateChild(ProcessID aProcessType,
const nsTArray<Accumulation>& aAccumulations)
{
MOZ_ASSERT(XRE_IsParentProcess());
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
if (!internal_CanRecordBase()) {
return;
}
for (uint32_t i = 0; i < aAccumulations.Length(); ++i) {
if (NS_WARN_IF(!internal_IsHistogramEnumId(aAccumulations[i].mId))) {
MOZ_ASSERT_UNREACHABLE("Histogram usage requires valid ids.");
continue;
}
internal_AccumulateChild(aProcessType, aAccumulations[i].mId, aAccumulations[i].mSample);
}
}
void
TelemetryHistogram::AccumulateChildKeyed(ProcessID aProcessType,
const nsTArray<KeyedAccumulation>& aAccumulations)
{
MOZ_ASSERT(XRE_IsParentProcess());
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
if (!internal_CanRecordBase()) {
return;
}
for (uint32_t i = 0; i < aAccumulations.Length(); ++i) {
if (NS_WARN_IF(!internal_IsHistogramEnumId(aAccumulations[i].mId))) {
MOZ_ASSERT_UNREACHABLE("Histogram usage requires valid ids.");
continue;
}
internal_AccumulateChildKeyed(aProcessType,
aAccumulations[i].mId,
aAccumulations[i].mKey,
aAccumulations[i].mSample);
}
}
nsresult
TelemetryHistogram::GetHistogramById(const nsACString &name, JSContext *cx,
JS::MutableHandle<JS::Value> ret)
{
HistogramID id;
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
nsresult rv = internal_GetHistogramIdByName(name, &id);
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
if (gHistogramInfos[id].keyed) {
return NS_ERROR_FAILURE;
}
}
// Runs without protection from |gTelemetryHistogramMutex|
return internal_WrapAndReturnHistogram(id, cx, ret);
}
nsresult
TelemetryHistogram::GetKeyedHistogramById(const nsACString &name,
JSContext *cx,
JS::MutableHandle<JS::Value> ret)
{
HistogramID id;
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
nsresult rv = internal_GetHistogramIdByName(name, &id);
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
if (!gHistogramInfos[id].keyed) {
return NS_ERROR_FAILURE;
}
}
// Runs without protection from |gTelemetryHistogramMutex|
return internal_WrapAndReturnKeyedHistogram(id, cx, ret);
}
const char*
TelemetryHistogram::GetHistogramName(HistogramID id)
{
if (NS_WARN_IF(!internal_IsHistogramEnumId(id))) {
MOZ_ASSERT_UNREACHABLE("Histogram usage requires valid ids.");
return nullptr;
}
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
const HistogramInfo& h = gHistogramInfos[id];
return h.name();
}
nsresult
TelemetryHistogram::CreateHistogramSnapshots(JSContext *cx,
JS::MutableHandle<JS::Value> ret,
bool subsession,
bool clearSubsession)
{
// Runs without protection from |gTelemetryHistogramMutex|
JS::Rooted<JSObject*> root_obj(cx, JS_NewPlainObject(cx));
if (!root_obj) {
return NS_ERROR_FAILURE;
}
ret.setObject(*root_obj);
// Include the GPU process in histogram snapshots only if we actually tried
// to launch a process for it.
bool includeGPUProcess = false;
if (auto gpm = mozilla::gfx::GPUProcessManager::Get()) {
includeGPUProcess = gpm->AttemptedGPUProcess();
}
#if !defined(MOZ_WIDGET_ANDROID)
SessionType sessionType = SessionType(subsession);
#else
SessionType sessionType = SessionType::Session;
#endif
for (uint32_t process = 0; process < static_cast<uint32_t>(ProcessID::Count); ++process) {
JS::Rooted<JSObject*> processObject(cx, JS_NewPlainObject(cx));
if (!processObject) {
return NS_ERROR_FAILURE;
}
if (!JS_DefineProperty(cx, root_obj, GetNameForProcessID(ProcessID(process)),
processObject, JSPROP_ENUMERATE)) {
return NS_ERROR_FAILURE;
}
for (size_t i = 0; i < HistogramCount; ++i) {
const HistogramInfo& info = gHistogramInfos[i];
if (info.keyed) {
continue;
}
HistogramID id = HistogramID(i);
if (!CanRecordInProcess(info.record_in_processes, ProcessID(process)) ||
((ProcessID(process) == ProcessID::Gpu) && !includeGPUProcess)) {
continue;
}
bool shouldInstantiate =
info.histogramType == nsITelemetry::HISTOGRAM_FLAG;
Histogram* h = internal_GetHistogramById(id, ProcessID(process),
sessionType,
shouldInstantiate);
if (!h || internal_IsExpired(h) || !internal_ShouldReflectHistogram(h, id)) {
continue;
}
JS::Rooted<JSObject*> hobj(cx, JS_NewPlainObject(cx));
if (!hobj) {
return NS_ERROR_FAILURE;
}
switch (internal_ReflectHistogramSnapshot(cx, hobj, h)) {
case REFLECT_FAILURE:
return NS_ERROR_FAILURE;
case REFLECT_OK:
if (!JS_DefineProperty(cx, processObject, gHistogramInfos[id].name(),
hobj, JSPROP_ENUMERATE)) {
return NS_ERROR_FAILURE;
}
}
#if !defined(MOZ_WIDGET_ANDROID)
if ((sessionType == SessionType::Subsession) && clearSubsession) {
h->Clear();
}
#endif
}
}
return NS_OK;
}
nsresult
TelemetryHistogram::RegisteredHistograms(uint32_t aDataset, uint32_t *aCount,
char*** aHistograms)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
return internal_GetRegisteredHistogramIds(false,
aDataset, aCount, aHistograms);
}
nsresult
TelemetryHistogram::RegisteredKeyedHistograms(uint32_t aDataset,
uint32_t *aCount,
char*** aHistograms)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
return internal_GetRegisteredHistogramIds(true,
aDataset, aCount, aHistograms);
}
nsresult
TelemetryHistogram::GetKeyedHistogramSnapshots(JSContext *cx,
JS::MutableHandle<JS::Value> ret,
bool subsession,
bool clearSubsession)
{
// Runs without protection from |gTelemetryHistogramMutex|
JS::Rooted<JSObject*> obj(cx, JS_NewPlainObject(cx));
if (!obj) {
return NS_ERROR_FAILURE;
}
ret.setObject(*obj);
// Include the GPU process in histogram snapshots only if we actually tried
// to launch a process for it.
bool includeGPUProcess = false;
if (auto gpm = mozilla::gfx::GPUProcessManager::Get()) {
includeGPUProcess = gpm->AttemptedGPUProcess();
}
for (uint32_t process = 0; process < static_cast<uint32_t>(ProcessID::Count); ++process) {
JS::Rooted<JSObject*> processObject(cx, JS_NewPlainObject(cx));
if (!processObject) {
return NS_ERROR_FAILURE;
}
if (!JS_DefineProperty(cx, obj, GetNameForProcessID(ProcessID(process)),
processObject, JSPROP_ENUMERATE)) {
return NS_ERROR_FAILURE;
}
for (size_t id = 0; id < HistogramCount; ++id) {
const HistogramInfo& info = gHistogramInfos[id];
if (!info.keyed) {
continue;
}
if (!CanRecordInProcess(info.record_in_processes, ProcessID(process)) ||
((ProcessID(process) == ProcessID::Gpu) && !includeGPUProcess)) {
continue;
}
KeyedHistogram* keyed = internal_GetKeyedHistogramById(HistogramID(id),
ProcessID(process),
/* instantiate = */ false);
if (!keyed) {
continue;
}
JS::RootedObject snapshot(cx, JS_NewPlainObject(cx));
if (!snapshot) {
return NS_ERROR_FAILURE;
}
if (!NS_SUCCEEDED(keyed->GetJSSnapshot(cx, snapshot, subsession,
clearSubsession))) {
return NS_ERROR_FAILURE;
}
if (!JS_DefineProperty(cx, processObject, gHistogramInfos[id].name(),
snapshot, JSPROP_ENUMERATE)) {
return NS_ERROR_FAILURE;
}
}
}
return NS_OK;
}
size_t
TelemetryHistogram::GetMapShallowSizesOfExcludingThis(mozilla::MallocSizeOf
aMallocSizeOf)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
// TODO
return 0;
}
size_t
TelemetryHistogram::GetHistogramSizesofIncludingThis(mozilla::MallocSizeOf
aMallocSizeOf)
{
StaticMutexAutoLock locker(gTelemetryHistogramMutex);
// TODO
return 0;
}
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