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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 "mozilla/JSONWriter.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/nsMemoryInfoDumper.h"
#include "mozilla/DebugOnly.h"
#include "nsDumpUtils.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/ContentChild.h"
#include "nsIConsoleService.h"
#include "nsCycleCollector.h"
#include "nsICycleCollectorListener.h"
#include "nsIMemoryReporter.h"
#include "nsDirectoryServiceDefs.h"
#include "nsGZFileWriter.h"
#include "nsJSEnvironment.h"
#include "nsPrintfCString.h"
#include "nsServiceManagerUtils.h"
#include "nsIFile.h"
#ifdef XP_WIN
# include <process.h>
# ifndef getpid
# define getpid _getpid
# endif
#else
# include <unistd.h>
#endif
#ifdef XP_UNIX
# define MOZ_SUPPORTS_FIFO 1
#endif
// Some Android devices seem to send RT signals to Firefox so we want to avoid
// consuming those as they're not user triggered.
#if !defined(ANDROID) && (defined(XP_LINUX) || defined(__FreeBSD__))
# define MOZ_SUPPORTS_RT_SIGNALS 1
#endif
#if defined(MOZ_SUPPORTS_RT_SIGNALS)
# include <fcntl.h>
# include <sys/types.h>
# include <sys/stat.h>
#endif
#if defined(MOZ_SUPPORTS_FIFO)
# include "mozilla/Preferences.h"
#endif
using namespace mozilla;
using namespace mozilla::dom;
namespace {
class DumpMemoryInfoToTempDirRunnable : public Runnable {
public:
DumpMemoryInfoToTempDirRunnable(const nsAString& aIdentifier, bool aAnonymize,
bool aMinimizeMemoryUsage)
: mozilla::Runnable("DumpMemoryInfoToTempDirRunnable"),
mIdentifier(aIdentifier),
mAnonymize(aAnonymize),
mMinimizeMemoryUsage(aMinimizeMemoryUsage) {}
NS_IMETHOD Run() override {
nsCOMPtr<nsIMemoryInfoDumper> dumper =
do_GetService("@mozilla.org/memory-info-dumper;1");
dumper->DumpMemoryInfoToTempDir(mIdentifier, mAnonymize,
mMinimizeMemoryUsage);
return NS_OK;
}
private:
const nsString mIdentifier;
const bool mAnonymize;
const bool mMinimizeMemoryUsage;
};
class GCAndCCLogDumpRunnable final : public Runnable,
public nsIDumpGCAndCCLogsCallback {
public:
NS_DECL_ISUPPORTS_INHERITED
GCAndCCLogDumpRunnable(const nsAString& aIdentifier, bool aDumpAllTraces,
bool aDumpChildProcesses)
: mozilla::Runnable("GCAndCCLogDumpRunnable"),
mIdentifier(aIdentifier),
mDumpAllTraces(aDumpAllTraces),
mDumpChildProcesses(aDumpChildProcesses) {}
NS_IMETHOD Run() override {
nsCOMPtr<nsIMemoryInfoDumper> dumper =
do_GetService("@mozilla.org/memory-info-dumper;1");
dumper->DumpGCAndCCLogsToFile(mIdentifier, mDumpAllTraces,
mDumpChildProcesses, this);
return NS_OK;
}
NS_IMETHOD OnDump(nsIFile* aGCLog, nsIFile* aCCLog, bool aIsParent) override {
return NS_OK;
}
NS_IMETHOD OnFinish() override { return NS_OK; }
private:
~GCAndCCLogDumpRunnable() = default;
const nsString mIdentifier;
const bool mDumpAllTraces;
const bool mDumpChildProcesses;
};
NS_IMPL_ISUPPORTS_INHERITED(GCAndCCLogDumpRunnable, Runnable,
nsIDumpGCAndCCLogsCallback)
} // namespace
#if defined(MOZ_SUPPORTS_RT_SIGNALS) // {
namespace {
/*
* The following code supports dumping about:memory upon receiving a signal.
*
* We listen for the following signals:
*
* - SIGRTMIN: Dump our memory reporters (and those of our child
* processes),
* - SIGRTMIN + 1: Dump our memory reporters (and those of our child
* processes) after minimizing memory usage, and
* - SIGRTMIN + 2: Dump the GC and CC logs in this and our child processes.
*
* When we receive one of these signals, we write the signal number to a pipe.
* The IO thread then notices that the pipe has been written to, and kicks off
* the appropriate task on the main thread.
*
* This scheme is similar to using signalfd(), except it's portable and it
* doesn't require the use of sigprocmask, which is problematic because it
* masks signals received by child processes.
*
* In theory, we could use Chromium's MessageLoopForIO::CatchSignal() for this.
* But that uses libevent, which does not handle the realtime signals (bug
* 794074).
*/
// It turns out that at least on some systems, SIGRTMIN is not a compile-time
// constant, so these have to be set at runtime.
static uint8_t sDumpAboutMemorySignum; // SIGRTMIN
static uint8_t sDumpAboutMemoryAfterMMUSignum; // SIGRTMIN + 1
static uint8_t sGCAndCCDumpSignum; // SIGRTMIN + 2
void doMemoryReport(const uint8_t aRecvSig) {
// Dump our memory reports (but run this on the main thread!).
bool minimize = aRecvSig == sDumpAboutMemoryAfterMMUSignum;
LOG("SignalWatcher(sig %d) dispatching memory report runnable.", aRecvSig);
RefPtr<DumpMemoryInfoToTempDirRunnable> runnable =
new DumpMemoryInfoToTempDirRunnable(/* identifier = */ u""_ns,
/* anonymize = */ false, minimize);
NS_DispatchToMainThread(runnable);
}
void doGCCCDump(const uint8_t aRecvSig) {
LOG("SignalWatcher(sig %d) dispatching GC/CC log runnable.", aRecvSig);
// Dump GC and CC logs (from the main thread).
RefPtr<GCAndCCLogDumpRunnable> runnable =
new GCAndCCLogDumpRunnable(/* identifier = */ u""_ns,
/* allTraces = */ true,
/* dumpChildProcesses = */ true);
NS_DispatchToMainThread(runnable);
}
} // namespace
#endif // MOZ_SUPPORTS_RT_SIGNALS }
#if defined(MOZ_SUPPORTS_FIFO) // {
namespace {
void doMemoryReport(const nsCString& aInputStr) {
bool minimize = aInputStr.EqualsLiteral("minimize memory report");
LOG("FifoWatcher(command:%s) dispatching memory report runnable.",
aInputStr.get());
RefPtr<DumpMemoryInfoToTempDirRunnable> runnable =
new DumpMemoryInfoToTempDirRunnable(/* identifier = */ u""_ns,
/* anonymize = */ false, minimize);
NS_DispatchToMainThread(runnable);
}
void doGCCCDump(const nsCString& aInputStr) {
bool doAllTracesGCCCDump = aInputStr.EqualsLiteral("gc log");
LOG("FifoWatcher(command:%s) dispatching GC/CC log runnable.",
aInputStr.get());
RefPtr<GCAndCCLogDumpRunnable> runnable = new GCAndCCLogDumpRunnable(
/* identifier = */ u""_ns, doAllTracesGCCCDump,
/* dumpChildProcesses = */ true);
NS_DispatchToMainThread(runnable);
}
bool SetupFifo() {
# ifdef DEBUG
static bool fifoCallbacksRegistered = false;
# endif
if (!FifoWatcher::MaybeCreate()) {
return false;
}
MOZ_ASSERT(!fifoCallbacksRegistered,
"FifoWatcher callbacks should be registered only once");
FifoWatcher* fw = FifoWatcher::GetSingleton();
// Dump our memory reports (but run this on the main thread!).
fw->RegisterCallback("memory report"_ns, doMemoryReport);
fw->RegisterCallback("minimize memory report"_ns, doMemoryReport);
// Dump GC and CC logs (from the main thread).
fw->RegisterCallback("gc log"_ns, doGCCCDump);
fw->RegisterCallback("abbreviated gc log"_ns, doGCCCDump);
# ifdef DEBUG
fifoCallbacksRegistered = true;
# endif
return true;
}
void OnFifoEnabledChange(const char* /*unused*/, void* /*unused*/) {
LOG("%s changed", FifoWatcher::kPrefName);
if (SetupFifo()) {
Preferences::UnregisterCallback(OnFifoEnabledChange,
FifoWatcher::kPrefName);
}
}
} // namespace
#endif // MOZ_SUPPORTS_FIFO }
NS_IMPL_ISUPPORTS(nsMemoryInfoDumper, nsIMemoryInfoDumper)
nsMemoryInfoDumper::nsMemoryInfoDumper() = default;
nsMemoryInfoDumper::~nsMemoryInfoDumper() = default;
/* static */
void nsMemoryInfoDumper::Initialize() {
#if defined(MOZ_SUPPORTS_RT_SIGNALS)
SignalPipeWatcher* sw = SignalPipeWatcher::GetSingleton();
// Dump memory reporters (and those of our child processes)
sDumpAboutMemorySignum = SIGRTMIN;
sw->RegisterCallback(sDumpAboutMemorySignum, doMemoryReport);
// Dump our memory reporters after minimizing memory usage
sDumpAboutMemoryAfterMMUSignum = SIGRTMIN + 1;
sw->RegisterCallback(sDumpAboutMemoryAfterMMUSignum, doMemoryReport);
// Dump the GC and CC logs in this and our child processes.
sGCAndCCDumpSignum = SIGRTMIN + 2;
sw->RegisterCallback(sGCAndCCDumpSignum, doGCCCDump);
#endif
#if defined(MOZ_SUPPORTS_FIFO)
if (!SetupFifo()) {
// NB: This gets loaded early enough that it's possible there is a user pref
// set to enable the fifo watcher that has not been loaded yet. Register
// to attempt to initialize if the fifo watcher becomes enabled by
// a user pref.
Preferences::RegisterCallback(OnFifoEnabledChange, FifoWatcher::kPrefName);
}
#endif
}
static void EnsureNonEmptyIdentifier(nsAString& aIdentifier) {
if (!aIdentifier.IsEmpty()) {
return;
}
// If the identifier is empty, set it to the number of whole seconds since the
// epoch. This identifier will appear in the files that this process
// generates and also the files generated by this process's children, allowing
// us to identify which files are from the same memory report request.
aIdentifier.AppendInt(static_cast<int64_t>(PR_Now()) / 1000000);
}
// Use XPCOM refcounting to fire |onFinish| when all reference-holders
// (remote dump actors or the |DumpGCAndCCLogsToFile| activation itself)
// have gone away.
class nsDumpGCAndCCLogsCallbackHolder final
: public nsIDumpGCAndCCLogsCallback {
public:
NS_DECL_ISUPPORTS
explicit nsDumpGCAndCCLogsCallbackHolder(
nsIDumpGCAndCCLogsCallback* aCallback)
: mCallback(aCallback) {}
NS_IMETHOD OnFinish() override { return NS_ERROR_UNEXPECTED; }
NS_IMETHOD OnDump(nsIFile* aGCLog, nsIFile* aCCLog, bool aIsParent) override {
return mCallback->OnDump(aGCLog, aCCLog, aIsParent);
}
private:
~nsDumpGCAndCCLogsCallbackHolder() { Unused << mCallback->OnFinish(); }
nsCOMPtr<nsIDumpGCAndCCLogsCallback> mCallback;
};
NS_IMPL_ISUPPORTS(nsDumpGCAndCCLogsCallbackHolder, nsIDumpGCAndCCLogsCallback)
NS_IMETHODIMP
nsMemoryInfoDumper::DumpGCAndCCLogsToFile(
const nsAString& aIdentifier, bool aDumpAllTraces, bool aDumpChildProcesses,
nsIDumpGCAndCCLogsCallback* aCallback) {
nsString identifier(aIdentifier);
EnsureNonEmptyIdentifier(identifier);
nsCOMPtr<nsIDumpGCAndCCLogsCallback> callbackHolder =
new nsDumpGCAndCCLogsCallbackHolder(aCallback);
if (aDumpChildProcesses) {
nsTArray<ContentParent*> children;
ContentParent::GetAll(children);
for (uint32_t i = 0; i < children.Length(); i++) {
ContentParent* cp = children[i];
nsCOMPtr<nsICycleCollectorLogSink> logSink =
nsCycleCollector_createLogSink();
logSink->SetFilenameIdentifier(identifier);
logSink->SetProcessIdentifier(cp->Pid());
Unused << cp->CycleCollectWithLogs(aDumpAllTraces, logSink,
callbackHolder);
}
}
nsCOMPtr<nsICycleCollectorListener> logger = nsCycleCollector_createLogger();
if (aDumpAllTraces) {
nsCOMPtr<nsICycleCollectorListener> allTracesLogger;
logger->AllTraces(getter_AddRefs(allTracesLogger));
logger = allTracesLogger;
}
nsCOMPtr<nsICycleCollectorLogSink> logSink;
logger->GetLogSink(getter_AddRefs(logSink));
logSink->SetFilenameIdentifier(identifier);
nsJSContext::CycleCollectNow(logger);
nsCOMPtr<nsIFile> gcLog, ccLog;
logSink->GetGcLog(getter_AddRefs(gcLog));
logSink->GetCcLog(getter_AddRefs(ccLog));
callbackHolder->OnDump(gcLog, ccLog, /* parent = */ true);
return NS_OK;
}
NS_IMETHODIMP
nsMemoryInfoDumper::DumpGCAndCCLogsToSink(bool aDumpAllTraces,
nsICycleCollectorLogSink* aSink) {
nsCOMPtr<nsICycleCollectorListener> logger = nsCycleCollector_createLogger();
if (aDumpAllTraces) {
nsCOMPtr<nsICycleCollectorListener> allTracesLogger;
logger->AllTraces(getter_AddRefs(allTracesLogger));
logger = allTracesLogger;
}
logger->SetLogSink(aSink);
nsJSContext::CycleCollectNow(logger);
return NS_OK;
}
static void MakeFilename(const char* aPrefix, const nsAString& aIdentifier,
int aPid, const char* aSuffix, nsACString& aResult) {
aResult =
nsPrintfCString("%s-%s-%d.%s", aPrefix,
NS_ConvertUTF16toUTF8(aIdentifier).get(), aPid, aSuffix);
}
// This class wraps GZFileWriter so it can be used with JSONWriter, overcoming
// the following two problems:
// - It provides a JSONWriterFunc::Write() that calls nsGZFileWriter::Write().
// - It can be stored as a UniquePtr, whereas nsGZFileWriter is refcounted.
class GZWriterWrapper : public JSONWriteFunc {
public:
explicit GZWriterWrapper(nsGZFileWriter* aGZWriter) : mGZWriter(aGZWriter) {}
void Write(const Span<const char>& aStr) override {
// Ignore any failure because JSONWriteFunc doesn't have a mechanism for
// handling errors.
Unused << mGZWriter->Write(aStr.data(), aStr.size());
}
nsresult Finish() { return mGZWriter->Finish(); }
private:
RefPtr<nsGZFileWriter> mGZWriter;
};
// We need two callbacks: one that handles reports, and one that is called at
// the end of reporting. Both the callbacks need access to the same JSONWriter,
// so we implement both of them in this one class.
class HandleReportAndFinishReportingCallbacks final
: public nsIHandleReportCallback,
public nsIFinishReportingCallback {
public:
NS_DECL_ISUPPORTS
HandleReportAndFinishReportingCallbacks(
UniquePtr<JSONWriter> aWriter, nsIFinishDumpingCallback* aFinishDumping,
nsISupports* aFinishDumpingData)
: mWriter(std::move(aWriter)),
mFinishDumping(aFinishDumping),
mFinishDumpingData(aFinishDumpingData) {}
// This is the callback for nsIHandleReportCallback.
NS_IMETHOD Callback(const nsACString& aProcess, const nsACString& aPath,
int32_t aKind, int32_t aUnits, int64_t aAmount,
const nsACString& aDescription,
nsISupports* aData) override {
nsAutoCString process;
if (aProcess.IsEmpty()) {
// If the process is empty, the report originated with the process doing
// the dumping. In that case, generate the process identifier, which is
// of the form "$PROCESS_NAME (pid $PID)", or just "(pid $PID)" if we
// don't have a process name. If we're the main process, we let
// $PROCESS_NAME be "Main Process".
//
// `appendAboutMemoryMain()` in aboutMemory.js does much the same thing
// for live memory reports.
if (XRE_IsParentProcess()) {
// We're the main process.
process.AssignLiteral("Main Process");
} else if (ContentChild* cc = ContentChild::GetSingleton()) {
// Try to get the process name from ContentChild.
cc->GetProcessName(process);
}
ContentChild::AppendProcessId(process);
} else {
// Otherwise, the report originated with another process and already has a
// process name. Just use that.
process = aProcess;
}
mWriter->StartObjectElement();
{
mWriter->StringProperty("process", process);
mWriter->StringProperty("path", PromiseFlatCString(aPath));
mWriter->IntProperty("kind", aKind);
mWriter->IntProperty("units", aUnits);
mWriter->IntProperty("amount", aAmount);
mWriter->StringProperty("description", PromiseFlatCString(aDescription));
}
mWriter->EndObject();
return NS_OK;
}
// This is the callback for nsIFinishReportingCallback.
NS_IMETHOD Callback(nsISupports* aData) override {
mWriter->EndArray(); // end of "reports" array
mWriter->End();
// The call to Finish() deallocates the memory allocated by the first Write
// call. Because that memory was live while the memory reporters ran and
// was measured by them -- by "heap-allocated" if nothing else -- we want
// DMD to see it as well. So we deliberately don't call Finish() until
// after DMD finishes.
nsresult rv = static_cast<GZWriterWrapper*>(mWriter->WriteFunc())->Finish();
NS_ENSURE_SUCCESS(rv, rv);
if (!mFinishDumping) {
return NS_OK;
}
return mFinishDumping->Callback(mFinishDumpingData);
}
private:
~HandleReportAndFinishReportingCallbacks() = default;
UniquePtr<JSONWriter> mWriter;
nsCOMPtr<nsIFinishDumpingCallback> mFinishDumping;
nsCOMPtr<nsISupports> mFinishDumpingData;
};
NS_IMPL_ISUPPORTS(HandleReportAndFinishReportingCallbacks,
nsIHandleReportCallback, nsIFinishReportingCallback)
class TempDirFinishCallback final : public nsIFinishDumpingCallback {
public:
NS_DECL_ISUPPORTS
TempDirFinishCallback(nsIFile* aReportsTmpFile,
const nsCString& aReportsFinalFilename)
: mReportsTmpFile(aReportsTmpFile),
mReportsFilename(aReportsFinalFilename) {}
NS_IMETHOD Callback(nsISupports* aData) override {
// Rename the memory reports file, now that we're done writing all the
// files. Its final name is "memory-report<-identifier>-<pid>.json.gz".
nsCOMPtr<nsIFile> reportsFinalFile;
nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR,
getter_AddRefs(reportsFinalFile));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
#ifdef ANDROID
rv = reportsFinalFile->AppendNative("memory-reports"_ns);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
#endif
rv = reportsFinalFile->AppendNative(mReportsFilename);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = reportsFinalFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsAutoString reportsFinalFilename;
rv = reportsFinalFile->GetLeafName(reportsFinalFilename);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = mReportsTmpFile->MoveTo(/* directory */ nullptr, reportsFinalFilename);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Write a message to the console.
nsCOMPtr<nsIConsoleService> cs =
do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsString path;
mReportsTmpFile->GetPath(path);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsString msg = u"nsIMemoryInfoDumper dumped reports to "_ns;
msg.Append(path);
return cs->LogStringMessage(msg.get());
}
private:
~TempDirFinishCallback() = default;
nsCOMPtr<nsIFile> mReportsTmpFile;
nsCString mReportsFilename;
};
NS_IMPL_ISUPPORTS(TempDirFinishCallback, nsIFinishDumpingCallback)
static nsresult DumpMemoryInfoToFile(nsIFile* aReportsFile,
nsIFinishDumpingCallback* aFinishDumping,
nsISupports* aFinishDumpingData,
bool aAnonymize, bool aMinimizeMemoryUsage,
nsAString& aDMDIdentifier) {
RefPtr<nsGZFileWriter> gzWriter = new nsGZFileWriter();
nsresult rv = gzWriter->Init(aReportsFile);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
auto jsonWriter =
MakeUnique<JSONWriter>(MakeUnique<GZWriterWrapper>(gzWriter));
nsCOMPtr<nsIMemoryReporterManager> mgr =
do_GetService("@mozilla.org/memory-reporter-manager;1");
// This is the first write to the file, and it causes |aWriter| to allocate
// over 200 KiB of memory.
jsonWriter->Start();
{
// Increment this number if the format changes.
jsonWriter->IntProperty("version", 1);
jsonWriter->BoolProperty("hasMozMallocUsableSize",
mgr->GetHasMozMallocUsableSize());
jsonWriter->StartArrayProperty("reports");
}
RefPtr<HandleReportAndFinishReportingCallbacks>
handleReportAndFinishReporting =
new HandleReportAndFinishReportingCallbacks(
std::move(jsonWriter), aFinishDumping, aFinishDumpingData);
rv = mgr->GetReportsExtended(
handleReportAndFinishReporting, nullptr, handleReportAndFinishReporting,
nullptr, aAnonymize, aMinimizeMemoryUsage, aDMDIdentifier);
return rv;
}
NS_IMETHODIMP
nsMemoryInfoDumper::DumpMemoryReportsToNamedFile(
const nsAString& aFilename, nsIFinishDumpingCallback* aFinishDumping,
nsISupports* aFinishDumpingData, bool aAnonymize,
bool aMinimizeMemoryUsage) {
MOZ_ASSERT(!aFilename.IsEmpty());
// Create the file.
nsCOMPtr<nsIFile> reportsFile;
nsresult rv = NS_NewLocalFile(aFilename, false, getter_AddRefs(reportsFile));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
reportsFile->InitWithPath(aFilename);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
bool exists;
rv = reportsFile->Exists(&exists);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (!exists) {
rv = reportsFile->Create(nsIFile::NORMAL_FILE_TYPE, 0644);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
nsString dmdIdent;
return DumpMemoryInfoToFile(reportsFile, aFinishDumping, aFinishDumpingData,
aAnonymize, aMinimizeMemoryUsage, dmdIdent);
}
NS_IMETHODIMP
nsMemoryInfoDumper::DumpMemoryInfoToTempDir(const nsAString& aIdentifier,
bool aAnonymize,
bool aMinimizeMemoryUsage) {
nsString identifier(aIdentifier);
EnsureNonEmptyIdentifier(identifier);
// Open a new file named something like
//
// incomplete-memory-report-<identifier>-<pid>.json.gz
//
// in NS_OS_TEMP_DIR for writing. When we're finished writing the report,
// we'll rename this file and get rid of the "incomplete-" prefix.
//
// We do this because we don't want scripts which poll the filesystem
// looking for memory report dumps to grab a file before we're finished
// writing to it.
// The "unified" indicates that we merge the memory reports from all
// processes and write out one file, rather than a separate file for
// each process as was the case before bug 946407. This is so that
// the get_about_memory.py script in the B2G repository can
// determine when it's done waiting for files to appear.
nsCString reportsFinalFilename;
MakeFilename("unified-memory-report", identifier, getpid(), "json.gz",
reportsFinalFilename);
nsCOMPtr<nsIFile> reportsTmpFile;
nsresult rv;
// In Android case, this function will open a file named aFilename under
// specific folder (/data/local/tmp/memory-reports). Otherwise, it will
// open a file named aFilename under "NS_OS_TEMP_DIR".
rv = nsDumpUtils::OpenTempFile("incomplete-"_ns + reportsFinalFilename,
getter_AddRefs(reportsTmpFile),
"memory-reports"_ns);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
RefPtr<TempDirFinishCallback> finishDumping =
new TempDirFinishCallback(reportsTmpFile, reportsFinalFilename);
return DumpMemoryInfoToFile(reportsTmpFile, finishDumping, nullptr,
aAnonymize, aMinimizeMemoryUsage, identifier);
}
#ifdef MOZ_DMD
dmd::DMDFuncs::Singleton dmd::DMDFuncs::sSingleton;
nsresult nsMemoryInfoDumper::OpenDMDFile(const nsAString& aIdentifier, int aPid,
FILE** aOutFile) {
if (!dmd::IsRunning()) {
*aOutFile = nullptr;
return NS_OK;
}
// Create a filename like dmd-<identifier>-<pid>.json.gz, which will be used
// if DMD is enabled.
nsCString dmdFilename;
MakeFilename("dmd", aIdentifier, aPid, "json.gz", dmdFilename);
// Open a new DMD file named |dmdFilename| in NS_OS_TEMP_DIR for writing,
// and dump DMD output to it. This must occur after the memory reporters
// have been run (above), but before the memory-reports file has been
// renamed (so scripts can detect the DMD file, if present).
nsresult rv;
nsCOMPtr<nsIFile> dmdFile;
rv = nsDumpUtils::OpenTempFile(dmdFilename, getter_AddRefs(dmdFile),
"memory-reports"_ns);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = dmdFile->OpenANSIFileDesc("wb", aOutFile);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "OpenANSIFileDesc failed");
// Print the path, because on some platforms (e.g. Mac) it's not obvious.
dmd::StatusMsg("opened %s for writing\n", dmdFile->HumanReadablePath().get());
return rv;
}
nsresult nsMemoryInfoDumper::DumpDMDToFile(FILE* aFile) {
RefPtr<nsGZFileWriter> gzWriter = new nsGZFileWriter();
nsresult rv = gzWriter->InitANSIFileDesc(aFile);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Dump DMD's memory reports analysis to the file.
dmd::Analyze(MakeUnique<GZWriterWrapper>(gzWriter));
rv = gzWriter->Finish();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Finish failed");
return rv;
}
#endif // MOZ_DMD