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gecko-dev/dom/ipc/ProcessHangMonitor.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 "mozilla/ProcessHangMonitor.h"
#include "mozilla/ProcessHangMonitorIPC.h"
#include "jsapi.h"
#include "js/GCAPI.h"
#include "mozilla/Atomics.h"
#include "mozilla/BackgroundHangMonitor.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/ipc/TaskFactory.h"
#include "mozilla/Monitor.h"
#include "mozilla/plugins/PluginBridge.h"
#include "mozilla/Preferences.h"
#include "mozilla/Unused.h"
#include "nsIFrameLoader.h"
#include "nsIHangReport.h"
#include "nsITabParent.h"
#include "nsPluginHost.h"
#include "nsThreadUtils.h"
#ifdef MOZ_CRASHREPORTER
#include "nsExceptionHandler.h"
#endif
#include "base/task.h"
#include "base/thread.h"
#ifdef XP_WIN
// For IsDebuggerPresent()
#include <windows.h>
#endif
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::ipc;
/*
* Basic architecture:
*
* Each process has its own ProcessHangMonitor singleton. This singleton exists
* as long as there is at least one content process in the system. Each content
* process has a HangMonitorChild and the chrome process has one
* HangMonitorParent per process. Each process (including the chrome process)
* runs a hang monitoring thread. The PHangMonitor actors are bound to this
* thread so that they never block on the main thread.
*
* When the content process detects a hang, it posts a task to its hang thread,
* which sends an IPC message to the hang thread in the parent. The parent
* cancels any ongoing CPOW requests and then posts a runnable to the main
* thread that notifies Firefox frontend code of the hang. The frontend code is
* passed an nsIHangReport, which can be used to terminate the hang.
*
* If the user chooses to terminate a script, a task is posted to the chrome
* process's hang monitoring thread, which sends an IPC message to the hang
* thread in the content process. That thread sets a flag to indicate that JS
* execution should be terminated the next time it hits the interrupt
* callback. A similar scheme is used for debugging slow scripts. If a content
* process or plug-in needs to be terminated, the chrome process does so
* directly, without messaging the content process.
*/
namespace {
/* Child process objects */
class HangMonitorChild
: public PProcessHangMonitorChild
{
public:
explicit HangMonitorChild(ProcessHangMonitor* aMonitor);
~HangMonitorChild() override;
void Bind(Endpoint<PProcessHangMonitorChild>&& aEndpoint);
typedef ProcessHangMonitor::SlowScriptAction SlowScriptAction;
SlowScriptAction NotifySlowScript(nsITabChild* aTabChild,
const char* aFileName);
void NotifySlowScriptAsync(TabId aTabId,
const nsCString& aFileName);
bool IsDebuggerStartupComplete();
void NotifyPluginHang(uint32_t aPluginId);
void NotifyPluginHangAsync(uint32_t aPluginId);
void ClearHang();
void ClearHangAsync();
void ClearForcePaint();
mozilla::ipc::IPCResult RecvTerminateScript() override;
mozilla::ipc::IPCResult RecvBeginStartingDebugger() override;
mozilla::ipc::IPCResult RecvEndStartingDebugger() override;
mozilla::ipc::IPCResult RecvForcePaint(const TabId& aTabId, const uint64_t& aLayerObserverEpoch) override;
void ActorDestroy(ActorDestroyReason aWhy) override;
void InterruptCallback();
void Shutdown();
static HangMonitorChild* Get() { return sInstance; }
void Dispatch(already_AddRefed<nsIRunnable> aRunnable)
{
mHangMonitor->Dispatch(Move(aRunnable));
}
bool IsOnThread() { return mHangMonitor->IsOnThread(); }
private:
void ShutdownOnThread();
static Atomic<HangMonitorChild*> sInstance;
UniquePtr<BackgroundHangMonitor> mForcePaintMonitor;
const RefPtr<ProcessHangMonitor> mHangMonitor;
Monitor mMonitor;
// Main thread-only.
bool mSentReport;
// These fields must be accessed with mMonitor held.
bool mTerminateScript;
bool mStartDebugger;
bool mFinishedStartingDebugger;
bool mForcePaint;
TabId mForcePaintTab;
MOZ_INIT_OUTSIDE_CTOR uint64_t mForcePaintEpoch;
JSContext* mContext;
bool mShutdownDone;
// This field is only accessed on the hang thread.
bool mIPCOpen;
};
Atomic<HangMonitorChild*> HangMonitorChild::sInstance;
/* Parent process objects */
class HangMonitorParent;
class HangMonitoredProcess final
: public nsIHangReport
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
HangMonitoredProcess(HangMonitorParent* aActor,
ContentParent* aContentParent)
: mActor(aActor), mContentParent(aContentParent) {}
NS_IMETHOD GetHangType(uint32_t* aHangType) override;
NS_IMETHOD GetScriptBrowser(nsIDOMElement** aBrowser) override;
NS_IMETHOD GetScriptFileName(nsACString& aFileName) override;
NS_IMETHOD GetPluginName(nsACString& aPluginName) override;
NS_IMETHOD TerminateScript() override;
NS_IMETHOD BeginStartingDebugger() override;
NS_IMETHOD EndStartingDebugger() override;
NS_IMETHOD TerminatePlugin() override;
NS_IMETHOD UserCanceled() override;
NS_IMETHOD IsReportForBrowser(nsIFrameLoader* aFrameLoader, bool* aResult) override;
// Called when a content process shuts down.
void Clear() {
mContentParent = nullptr;
mActor = nullptr;
}
/**
* Sets the information associated with this hang: this includes the ID of
* the plugin which caused the hang as well as the content PID. The ID of
* a minidump taken during the hang can also be provided.
*
* @param aHangData The hang information
* @param aDumpId The ID of a minidump taken when the hang occurred
*/
void SetHangData(const HangData& aHangData, const nsAString& aDumpId) {
mHangData = aHangData;
mDumpId = aDumpId;
}
void ClearHang() {
mHangData = HangData();
mDumpId.Truncate();
}
private:
~HangMonitoredProcess() = default;
// Everything here is main thread-only.
HangMonitorParent* mActor;
ContentParent* mContentParent;
HangData mHangData;
nsAutoString mDumpId;
};
class HangMonitorParent
: public PProcessHangMonitorParent
{
public:
explicit HangMonitorParent(ProcessHangMonitor* aMonitor);
~HangMonitorParent() override;
void Bind(Endpoint<PProcessHangMonitorParent>&& aEndpoint);
mozilla::ipc::IPCResult RecvHangEvidence(const HangData& aHangData) override;
mozilla::ipc::IPCResult RecvClearHang() override;
void ActorDestroy(ActorDestroyReason aWhy) override;
void SetProcess(HangMonitoredProcess* aProcess) { mProcess = aProcess; }
void Shutdown();
void ForcePaint(dom::TabParent* aTabParent, uint64_t aLayerObserverEpoch);
void TerminateScript();
void BeginStartingDebugger();
void EndStartingDebugger();
void CleanupPluginHang(uint32_t aPluginId, bool aRemoveFiles);
/**
* Update the dump for the specified plugin. This method is thread-safe and
* is used to replace a browser minidump with a full minidump. If aDumpId is
* empty this is a no-op.
*/
void UpdateMinidump(uint32_t aPluginId, const nsString& aDumpId);
void Dispatch(already_AddRefed<nsIRunnable> aRunnable)
{
mHangMonitor->Dispatch(Move(aRunnable));
}
bool IsOnThread() { return mHangMonitor->IsOnThread(); }
private:
bool TakeBrowserMinidump(const PluginHangData& aPhd, nsString& aCrashId);
void SendHangNotification(const HangData& aHangData,
const nsString& aBrowserDumpId,
bool aTakeMinidump);
void ClearHangNotification();
void ForcePaintOnThread(TabId aTabId, uint64_t aLayerObserverEpoch);
void ShutdownOnThread();
const RefPtr<ProcessHangMonitor> mHangMonitor;
// This field is read-only after construction.
bool mReportHangs;
// This field is only accessed on the hang thread.
bool mIPCOpen;
Monitor mMonitor;
// Must be accessed with mMonitor held.
RefPtr<HangMonitoredProcess> mProcess;
bool mShutdownDone;
// Map from plugin ID to crash dump ID. Protected by mBrowserCrashDumpHashLock.
nsDataHashtable<nsUint32HashKey, nsString> mBrowserCrashDumpIds;
Mutex mBrowserCrashDumpHashLock;
mozilla::ipc::TaskFactory<HangMonitorParent> mMainThreadTaskFactory;
static bool sShouldForcePaint;
};
bool HangMonitorParent::sShouldForcePaint = true;
} // namespace
/* HangMonitorChild implementation */
HangMonitorChild::HangMonitorChild(ProcessHangMonitor* aMonitor)
: mHangMonitor(aMonitor),
mMonitor("HangMonitorChild lock"),
mSentReport(false),
mTerminateScript(false),
mStartDebugger(false),
mFinishedStartingDebugger(false),
mForcePaint(false),
mShutdownDone(false),
mIPCOpen(true)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
mContext = danger::GetJSContext();
mForcePaintMonitor =
MakeUnique<mozilla::BackgroundHangMonitor>("Gecko_Child_ForcePaint",
128, /* ms timeout for microhangs */
1024, /* ms timeout for permahangs */
BackgroundHangMonitor::THREAD_PRIVATE);
}
HangMonitorChild::~HangMonitorChild()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sInstance == this);
mForcePaintMonitor = nullptr;
sInstance = nullptr;
}
void
HangMonitorChild::InterruptCallback()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
bool forcePaint;
TabId forcePaintTab;
uint64_t forcePaintEpoch;
{
MonitorAutoLock lock(mMonitor);
forcePaint = mForcePaint;
forcePaintTab = mForcePaintTab;
forcePaintEpoch = mForcePaintEpoch;
mForcePaint = false;
}
if (forcePaint) {
RefPtr<TabChild> tabChild = TabChild::FindTabChild(forcePaintTab);
if (tabChild) {
js::AutoAssertNoContentJS nojs(mContext);
tabChild->ForcePaint(forcePaintEpoch);
}
}
}
void
HangMonitorChild::Shutdown()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MonitorAutoLock lock(mMonitor);
while (!mShutdownDone) {
mMonitor.Wait();
}
}
void
HangMonitorChild::ShutdownOnThread()
{
MOZ_RELEASE_ASSERT(IsOnThread());
MonitorAutoLock lock(mMonitor);
mShutdownDone = true;
mMonitor.Notify();
}
void
HangMonitorChild::ActorDestroy(ActorDestroyReason aWhy)
{
MOZ_RELEASE_ASSERT(IsOnThread());
mIPCOpen = false;
// We use a task here to ensure that IPDL is finished with this
// HangMonitorChild before it gets deleted on the main thread.
Dispatch(NewNonOwningRunnableMethod(this, &HangMonitorChild::ShutdownOnThread));
}
mozilla::ipc::IPCResult
HangMonitorChild::RecvTerminateScript()
{
MOZ_RELEASE_ASSERT(IsOnThread());
MonitorAutoLock lock(mMonitor);
mTerminateScript = true;
return IPC_OK();
}
mozilla::ipc::IPCResult
HangMonitorChild::RecvBeginStartingDebugger()
{
MOZ_RELEASE_ASSERT(IsOnThread());
MonitorAutoLock lock(mMonitor);
mStartDebugger = true;
return IPC_OK();
}
mozilla::ipc::IPCResult
HangMonitorChild::RecvEndStartingDebugger()
{
MOZ_RELEASE_ASSERT(IsOnThread());
MonitorAutoLock lock(mMonitor);
mFinishedStartingDebugger = true;
return IPC_OK();
}
mozilla::ipc::IPCResult
HangMonitorChild::RecvForcePaint(const TabId& aTabId, const uint64_t& aLayerObserverEpoch)
{
MOZ_RELEASE_ASSERT(IsOnThread());
mForcePaintMonitor->NotifyActivity();
{
MonitorAutoLock lock(mMonitor);
mForcePaint = true;
mForcePaintTab = aTabId;
mForcePaintEpoch = aLayerObserverEpoch;
}
JS_RequestInterruptCallback(mContext);
return IPC_OK();
}
void
HangMonitorChild::ClearForcePaint()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MOZ_RELEASE_ASSERT(XRE_IsContentProcess());
mForcePaintMonitor->NotifyWait();
}
void
HangMonitorChild::Bind(Endpoint<PProcessHangMonitorChild>&& aEndpoint)
{
MOZ_RELEASE_ASSERT(IsOnThread());
MOZ_ASSERT(!sInstance);
sInstance = this;
DebugOnly<bool> ok = aEndpoint.Bind(this);
MOZ_ASSERT(ok);
}
void
HangMonitorChild::NotifySlowScriptAsync(TabId aTabId,
const nsCString& aFileName)
{
if (mIPCOpen) {
Unused << SendHangEvidence(SlowScriptData(aTabId, aFileName));
}
}
HangMonitorChild::SlowScriptAction
HangMonitorChild::NotifySlowScript(nsITabChild* aTabChild,
const char* aFileName)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
mSentReport = true;
{
MonitorAutoLock lock(mMonitor);
if (mTerminateScript) {
mTerminateScript = false;
return SlowScriptAction::Terminate;
}
if (mStartDebugger) {
mStartDebugger = false;
return SlowScriptAction::StartDebugger;
}
}
TabId id;
if (aTabChild) {
RefPtr<TabChild> tabChild = static_cast<TabChild*>(aTabChild);
id = tabChild->GetTabId();
}
nsAutoCString filename(aFileName);
Dispatch(NewNonOwningRunnableMethod
<TabId, nsCString>(this,
&HangMonitorChild::NotifySlowScriptAsync,
id, filename));
return SlowScriptAction::Continue;
}
bool
HangMonitorChild::IsDebuggerStartupComplete()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MonitorAutoLock lock(mMonitor);
if (mFinishedStartingDebugger) {
mFinishedStartingDebugger = false;
return true;
}
return false;
}
void
HangMonitorChild::NotifyPluginHang(uint32_t aPluginId)
{
// main thread in the child
MOZ_RELEASE_ASSERT(NS_IsMainThread());
mSentReport = true;
// bounce to background thread
Dispatch(NewNonOwningRunnableMethod<uint32_t>(this,
&HangMonitorChild::NotifyPluginHangAsync,
aPluginId));
}
void
HangMonitorChild::NotifyPluginHangAsync(uint32_t aPluginId)
{
MOZ_RELEASE_ASSERT(IsOnThread());
// bounce back to parent on background thread
if (mIPCOpen) {
Unused << SendHangEvidence(PluginHangData(aPluginId,
base::GetCurrentProcId()));
}
}
void
HangMonitorChild::ClearHang()
{
MOZ_ASSERT(NS_IsMainThread());
if (mSentReport) {
// bounce to background thread
Dispatch(NewNonOwningRunnableMethod(this, &HangMonitorChild::ClearHangAsync));
MonitorAutoLock lock(mMonitor);
mSentReport = false;
mTerminateScript = false;
mStartDebugger = false;
mFinishedStartingDebugger = false;
}
}
void
HangMonitorChild::ClearHangAsync()
{
MOZ_RELEASE_ASSERT(IsOnThread());
// bounce back to parent on background thread
if (mIPCOpen) {
Unused << SendClearHang();
}
}
/* HangMonitorParent implementation */
HangMonitorParent::HangMonitorParent(ProcessHangMonitor* aMonitor)
: mHangMonitor(aMonitor),
mIPCOpen(true),
mMonitor("HangMonitorParent lock"),
mShutdownDone(false),
mBrowserCrashDumpHashLock("mBrowserCrashDumpIds lock"),
mMainThreadTaskFactory(this)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
mReportHangs = mozilla::Preferences::GetBool("dom.ipc.reportProcessHangs", false);
static bool sInited = false;
if (!sInited) {
sInited = true;
Preferences::AddBoolVarCache(&sShouldForcePaint,
"browser.tabs.remote.force-paint", true);
}
}
HangMonitorParent::~HangMonitorParent()
{
#ifdef MOZ_CRASHREPORTER
MutexAutoLock lock(mBrowserCrashDumpHashLock);
for (auto iter = mBrowserCrashDumpIds.Iter(); !iter.Done(); iter.Next()) {
nsString crashId = iter.UserData();
if (!crashId.IsEmpty()) {
CrashReporter::DeleteMinidumpFilesForID(crashId);
}
}
#endif
}
void
HangMonitorParent::Shutdown()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MonitorAutoLock lock(mMonitor);
if (mProcess) {
mProcess->Clear();
mProcess = nullptr;
}
Dispatch(NewNonOwningRunnableMethod(this,
&HangMonitorParent::ShutdownOnThread));
while (!mShutdownDone) {
mMonitor.Wait();
}
}
void
HangMonitorParent::ShutdownOnThread()
{
MOZ_RELEASE_ASSERT(IsOnThread());
// mIPCOpen is only written from this thread, so need need to take the lock
// here. We'd be shooting ourselves in the foot, because ActorDestroy takes
// it.
if (mIPCOpen) {
Close();
}
MonitorAutoLock lock(mMonitor);
mShutdownDone = true;
mMonitor.Notify();
}
void
HangMonitorParent::ForcePaint(dom::TabParent* aTab, uint64_t aLayerObserverEpoch)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (sShouldForcePaint) {
TabId id = aTab->GetTabId();
Dispatch(NewNonOwningRunnableMethod
<TabId, uint64_t>(this, &HangMonitorParent::ForcePaintOnThread, id, aLayerObserverEpoch));
}
}
void
HangMonitorParent::ForcePaintOnThread(TabId aTabId, uint64_t aLayerObserverEpoch)
{
MOZ_RELEASE_ASSERT(IsOnThread());
if (mIPCOpen) {
Unused << SendForcePaint(aTabId, aLayerObserverEpoch);
}
}
void
HangMonitorParent::ActorDestroy(ActorDestroyReason aWhy)
{
MOZ_RELEASE_ASSERT(IsOnThread());
mIPCOpen = false;
}
void
HangMonitorParent::Bind(Endpoint<PProcessHangMonitorParent>&& aEndpoint)
{
MOZ_RELEASE_ASSERT(IsOnThread());
DebugOnly<bool> ok = aEndpoint.Bind(this);
MOZ_ASSERT(ok);
}
void
HangMonitorParent::SendHangNotification(const HangData& aHangData,
const nsString& aBrowserDumpId,
bool aTakeMinidump)
{
// chrome process, main thread
MOZ_RELEASE_ASSERT(NS_IsMainThread());
nsString dumpId;
if ((aHangData.type() == HangData::TPluginHangData) && aTakeMinidump) {
// We've been handed a partial minidump; complete it with plugin and
// content process dumps.
const PluginHangData& phd = aHangData.get_PluginHangData();
plugins::TakeFullMinidump(phd.pluginId(), phd.contentProcessId(),
aBrowserDumpId, dumpId);
UpdateMinidump(phd.pluginId(), dumpId);
} else {
// We already have a full minidump; go ahead and use it.
dumpId = aBrowserDumpId;
}
mProcess->SetHangData(aHangData, dumpId);
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
observerService->NotifyObservers(mProcess, "process-hang-report", nullptr);
}
void
HangMonitorParent::ClearHangNotification()
{
// chrome process, main thread
MOZ_RELEASE_ASSERT(NS_IsMainThread());
mProcess->ClearHang();
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
observerService->NotifyObservers(mProcess, "clear-hang-report", nullptr);
}
// Take a minidump of the browser process if one wasn't already taken for the
// plugin that caused the hang. Return false if a dump was already available or
// true if new one has been taken.
bool
HangMonitorParent::TakeBrowserMinidump(const PluginHangData& aPhd,
nsString& aCrashId)
{
#ifdef MOZ_CRASHREPORTER
MutexAutoLock lock(mBrowserCrashDumpHashLock);
if (!mBrowserCrashDumpIds.Get(aPhd.pluginId(), &aCrashId)) {
nsCOMPtr<nsIFile> browserDump;
if (CrashReporter::TakeMinidump(getter_AddRefs(browserDump), true)) {
if (!CrashReporter::GetIDFromMinidump(browserDump, aCrashId)
|| aCrashId.IsEmpty()) {
browserDump->Remove(false);
NS_WARNING("Failed to generate timely browser stack, "
"this is bad for plugin hang analysis!");
} else {
mBrowserCrashDumpIds.Put(aPhd.pluginId(), aCrashId);
return true;
}
}
}
#endif // MOZ_CRASHREPORTER
return false;
}
mozilla::ipc::IPCResult
HangMonitorParent::RecvHangEvidence(const HangData& aHangData)
{
// chrome process, background thread
MOZ_RELEASE_ASSERT(IsOnThread());
if (!mReportHangs) {
return IPC_OK();
}
#ifdef XP_WIN
// Don't report hangs if we're debugging the process. You can comment this
// line out for testing purposes.
if (IsDebuggerPresent()) {
return IPC_OK();
}
#endif
// Before we wake up the browser main thread we want to take a
// browser minidump.
nsAutoString crashId;
bool takeMinidump = false;
if (aHangData.type() == HangData::TPluginHangData) {
takeMinidump = TakeBrowserMinidump(aHangData.get_PluginHangData(), crashId);
}
mHangMonitor->InitiateCPOWTimeout();
MonitorAutoLock lock(mMonitor);
NS_DispatchToMainThread(
mMainThreadTaskFactory.NewRunnableMethod(
&HangMonitorParent::SendHangNotification, aHangData, crashId,
takeMinidump));
return IPC_OK();
}
mozilla::ipc::IPCResult
HangMonitorParent::RecvClearHang()
{
// chrome process, background thread
MOZ_RELEASE_ASSERT(IsOnThread());
if (!mReportHangs) {
return IPC_OK();
}
mHangMonitor->InitiateCPOWTimeout();
MonitorAutoLock lock(mMonitor);
NS_DispatchToMainThread(
mMainThreadTaskFactory.NewRunnableMethod(
&HangMonitorParent::ClearHangNotification));
return IPC_OK();
}
void
HangMonitorParent::TerminateScript()
{
MOZ_RELEASE_ASSERT(IsOnThread());
if (mIPCOpen) {
Unused << SendTerminateScript();
}
}
void
HangMonitorParent::BeginStartingDebugger()
{
MOZ_RELEASE_ASSERT(IsOnThread());
if (mIPCOpen) {
Unused << SendBeginStartingDebugger();
}
}
void
HangMonitorParent::EndStartingDebugger()
{
MOZ_RELEASE_ASSERT(IsOnThread());
if (mIPCOpen) {
Unused << SendEndStartingDebugger();
}
}
void
HangMonitorParent::CleanupPluginHang(uint32_t aPluginId, bool aRemoveFiles)
{
MutexAutoLock lock(mBrowserCrashDumpHashLock);
nsAutoString crashId;
if (!mBrowserCrashDumpIds.Get(aPluginId, &crashId)) {
return;
}
mBrowserCrashDumpIds.Remove(aPluginId);
#ifdef MOZ_CRASHREPORTER
if (aRemoveFiles && !crashId.IsEmpty()) {
CrashReporter::DeleteMinidumpFilesForID(crashId);
}
#endif
}
void
HangMonitorParent::UpdateMinidump(uint32_t aPluginId, const nsString& aDumpId)
{
if (aDumpId.IsEmpty()) {
return;
}
MutexAutoLock lock(mBrowserCrashDumpHashLock);
mBrowserCrashDumpIds.Put(aPluginId, aDumpId);
}
/* HangMonitoredProcess implementation */
NS_IMPL_ISUPPORTS(HangMonitoredProcess, nsIHangReport)
NS_IMETHODIMP
HangMonitoredProcess::GetHangType(uint32_t* aHangType)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
switch (mHangData.type()) {
case HangData::TSlowScriptData:
*aHangType = SLOW_SCRIPT;
break;
case HangData::TPluginHangData:
*aHangType = PLUGIN_HANG;
break;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected HangData type");
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::GetScriptBrowser(nsIDOMElement** aBrowser)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TSlowScriptData) {
return NS_ERROR_NOT_AVAILABLE;
}
TabId tabId = mHangData.get_SlowScriptData().tabId();
if (!mContentParent) {
return NS_ERROR_NOT_AVAILABLE;
}
nsTArray<PBrowserParent*> tabs;
mContentParent->ManagedPBrowserParent(tabs);
for (size_t i = 0; i < tabs.Length(); i++) {
TabParent* tp = TabParent::GetFrom(tabs[i]);
if (tp->GetTabId() == tabId) {
nsCOMPtr<nsIDOMElement> node = do_QueryInterface(tp->GetOwnerElement());
node.forget(aBrowser);
return NS_OK;
}
}
*aBrowser = nullptr;
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::GetScriptFileName(nsACString& aFileName)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TSlowScriptData) {
return NS_ERROR_NOT_AVAILABLE;
}
aFileName = mHangData.get_SlowScriptData().filename();
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::GetPluginName(nsACString& aPluginName)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TPluginHangData) {
return NS_ERROR_NOT_AVAILABLE;
}
uint32_t id = mHangData.get_PluginHangData().pluginId();
RefPtr<nsPluginHost> host = nsPluginHost::GetInst();
nsPluginTag* tag = host->PluginWithId(id);
if (!tag) {
return NS_ERROR_UNEXPECTED;
}
aPluginName = tag->Name();
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::TerminateScript()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TSlowScriptData) {
return NS_ERROR_UNEXPECTED;
}
if (!mActor) {
return NS_ERROR_UNEXPECTED;
}
ProcessHangMonitor::Get()->Dispatch(NewNonOwningRunnableMethod(mActor,
&HangMonitorParent::TerminateScript));
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::BeginStartingDebugger()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TSlowScriptData) {
return NS_ERROR_UNEXPECTED;
}
if (!mActor) {
return NS_ERROR_UNEXPECTED;
}
ProcessHangMonitor::Get()->Dispatch(NewNonOwningRunnableMethod(mActor,
&HangMonitorParent::BeginStartingDebugger));
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::EndStartingDebugger()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TSlowScriptData) {
return NS_ERROR_UNEXPECTED;
}
if (!mActor) {
return NS_ERROR_UNEXPECTED;
}
ProcessHangMonitor::Get()->Dispatch(NewNonOwningRunnableMethod(mActor,
&HangMonitorParent::EndStartingDebugger));
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::TerminatePlugin()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TPluginHangData) {
return NS_ERROR_UNEXPECTED;
}
// Use the multi-process crash report generated earlier.
uint32_t id = mHangData.get_PluginHangData().pluginId();
base::ProcessId contentPid = mHangData.get_PluginHangData().contentProcessId();
plugins::TerminatePlugin(id, contentPid, NS_LITERAL_CSTRING("HangMonitor"),
mDumpId);
if (mActor) {
mActor->CleanupPluginHang(id, false);
}
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::IsReportForBrowser(nsIFrameLoader* aFrameLoader, bool* aResult)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (!mActor) {
*aResult = false;
return NS_OK;
}
TabParent* tp = TabParent::GetFrom(aFrameLoader);
if (!tp) {
*aResult = false;
return NS_OK;
}
*aResult = mContentParent == tp->Manager();
return NS_OK;
}
NS_IMETHODIMP
HangMonitoredProcess::UserCanceled()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mHangData.type() != HangData::TPluginHangData) {
return NS_OK;
}
if (mActor) {
uint32_t id = mHangData.get_PluginHangData().pluginId();
mActor->CleanupPluginHang(id, true);
}
return NS_OK;
}
static bool
InterruptCallback(JSContext* cx)
{
if (HangMonitorChild* child = HangMonitorChild::Get()) {
child->InterruptCallback();
}
return true;
}
ProcessHangMonitor* ProcessHangMonitor::sInstance;
ProcessHangMonitor::ProcessHangMonitor()
: mCPOWTimeout(false)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (XRE_IsContentProcess()) {
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
obs->AddObserver(this, "xpcom-shutdown", false);
}
if (NS_FAILED(NS_NewNamedThread("ProcessHangMon", getter_AddRefs(mThread)))) {
mThread = nullptr;
}
}
ProcessHangMonitor::~ProcessHangMonitor()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sInstance == this);
sInstance = nullptr;
mThread->Shutdown();
mThread = nullptr;
}
ProcessHangMonitor*
ProcessHangMonitor::GetOrCreate()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (!sInstance) {
sInstance = new ProcessHangMonitor();
}
return sInstance;
}
NS_IMPL_ISUPPORTS(ProcessHangMonitor, nsIObserver)
NS_IMETHODIMP
ProcessHangMonitor::Observe(nsISupports* aSubject, const char* aTopic, const char16_t* aData)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (!strcmp(aTopic, "xpcom-shutdown")) {
if (HangMonitorChild* child = HangMonitorChild::Get()) {
child->Shutdown();
delete child;
}
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, "xpcom-shutdown");
}
}
return NS_OK;
}
ProcessHangMonitor::SlowScriptAction
ProcessHangMonitor::NotifySlowScript(nsITabChild* aTabChild,
const char* aFileName)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
return HangMonitorChild::Get()->NotifySlowScript(aTabChild, aFileName);
}
bool
ProcessHangMonitor::IsDebuggerStartupComplete()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
return HangMonitorChild::Get()->IsDebuggerStartupComplete();
}
bool
ProcessHangMonitor::ShouldTimeOutCPOWs()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (mCPOWTimeout) {
mCPOWTimeout = false;
return true;
}
return false;
}
void
ProcessHangMonitor::InitiateCPOWTimeout()
{
MOZ_RELEASE_ASSERT(IsOnThread());
mCPOWTimeout = true;
}
void
ProcessHangMonitor::NotifyPluginHang(uint32_t aPluginId)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
return HangMonitorChild::Get()->NotifyPluginHang(aPluginId);
}
static PProcessHangMonitorParent*
CreateHangMonitorParent(ContentParent* aContentParent,
Endpoint<PProcessHangMonitorParent>&& aEndpoint)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
ProcessHangMonitor* monitor = ProcessHangMonitor::GetOrCreate();
auto* parent = new HangMonitorParent(monitor);
auto* process = new HangMonitoredProcess(parent, aContentParent);
parent->SetProcess(process);
monitor->Dispatch(NewNonOwningRunnableMethod
<Endpoint<PProcessHangMonitorParent>&&>(parent,
&HangMonitorParent::Bind,
Move(aEndpoint)));
return parent;
}
void
mozilla::CreateHangMonitorChild(Endpoint<PProcessHangMonitorChild>&& aEndpoint)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
JSContext* cx = danger::GetJSContext();
JS_AddInterruptCallback(cx, InterruptCallback);
ProcessHangMonitor* monitor = ProcessHangMonitor::GetOrCreate();
auto* child = new HangMonitorChild(monitor);
monitor->Dispatch(NewNonOwningRunnableMethod
<Endpoint<PProcessHangMonitorChild>&&>(child,
&HangMonitorChild::Bind,
Move(aEndpoint)));
}
void
ProcessHangMonitor::Dispatch(already_AddRefed<nsIRunnable> aRunnable)
{
mThread->Dispatch(Move(aRunnable), nsIEventTarget::NS_DISPATCH_NORMAL);
}
bool
ProcessHangMonitor::IsOnThread()
{
bool on;
return NS_SUCCEEDED(mThread->IsOnCurrentThread(&on)) && on;
}
/* static */ PProcessHangMonitorParent*
ProcessHangMonitor::AddProcess(ContentParent* aContentParent)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
if (!mozilla::Preferences::GetBool("dom.ipc.processHangMonitor", false)) {
return nullptr;
}
Endpoint<PProcessHangMonitorParent> parent;
Endpoint<PProcessHangMonitorChild> child;
nsresult rv;
rv = PProcessHangMonitor::CreateEndpoints(base::GetCurrentProcId(),
aContentParent->OtherPid(),
&parent, &child);
if (NS_FAILED(rv)) {
MOZ_ASSERT(false, "PProcessHangMonitor::CreateEndpoints failed");
return nullptr;
}
if (!aContentParent->SendInitProcessHangMonitor(Move(child))) {
MOZ_ASSERT(false);
return nullptr;
}
return CreateHangMonitorParent(aContentParent, Move(parent));
}
/* static */ void
ProcessHangMonitor::RemoveProcess(PProcessHangMonitorParent* aParent)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
auto parent = static_cast<HangMonitorParent*>(aParent);
parent->Shutdown();
delete parent;
}
/* static */ void
ProcessHangMonitor::ClearHang()
{
MOZ_ASSERT(NS_IsMainThread());
if (HangMonitorChild* child = HangMonitorChild::Get()) {
child->ClearHang();
}
}
/* static */ void
ProcessHangMonitor::ForcePaint(PProcessHangMonitorParent* aParent,
dom::TabParent* aTabParent,
uint64_t aLayerObserverEpoch)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
auto parent = static_cast<HangMonitorParent*>(aParent);
parent->ForcePaint(aTabParent, aLayerObserverEpoch);
}
/* static */ void
ProcessHangMonitor::ClearForcePaint()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MOZ_RELEASE_ASSERT(XRE_IsContentProcess());
if (HangMonitorChild* child = HangMonitorChild::Get()) {
child->ClearForcePaint();
}
}
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