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gecko-dev/dom/base/Console.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/Console.h"
#include "mozilla/dom/ConsoleBinding.h"
#include "mozilla/dom/BlobBinding.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/Maybe.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDocument.h"
#include "nsDOMNavigationTiming.h"
#include "nsGlobalWindow.h"
#include "nsJSUtils.h"
#include "nsPerformance.h"
#include "ScriptSettings.h"
#include "WorkerPrivate.h"
#include "WorkerRunnable.h"
#include "xpcprivate.h"
#include "nsContentUtils.h"
#include "nsDocShell.h"
#include "nsIConsoleAPIStorage.h"
#include "nsIDOMWindowUtils.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsILoadContext.h"
#include "nsIProgrammingLanguage.h"
#include "nsIServiceManager.h"
#include "nsISupportsPrimitives.h"
#include "nsIWebNavigation.h"
#include "nsIXPConnect.h"
// The maximum allowed number of concurrent timers per page.
#define MAX_PAGE_TIMERS 10000
// The maximum allowed number of concurrent counters per page.
#define MAX_PAGE_COUNTERS 10000
// The maximum stacktrace depth when populating the stacktrace array used for
// console.trace().
#define DEFAULT_MAX_STACKTRACE_DEPTH 200
// This tags are used in the Structured Clone Algorithm to move js values from
// worker thread to main thread
#define CONSOLE_TAG_BLOB JS_SCTAG_USER_MIN
using namespace mozilla::dom::exceptions;
using namespace mozilla::dom::workers;
namespace mozilla {
namespace dom {
struct
ConsoleStructuredCloneData
{
nsCOMPtr<nsISupports> mParent;
nsTArray<nsRefPtr<FileImpl>> mFiles;
};
/**
* Console API in workers uses the Structured Clone Algorithm to move any value
* from the worker thread to the main-thread. Some object cannot be moved and,
* in these cases, we convert them to strings.
* It's not the best, but at least we are able to show something.
*/
// This method is called by the Structured Clone Algorithm when some data has
// to be read.
static JSObject*
ConsoleStructuredCloneCallbacksRead(JSContext* aCx,
JSStructuredCloneReader* /* unused */,
uint32_t aTag, uint32_t aIndex,
void* aClosure)
{
AssertIsOnMainThread();
ConsoleStructuredCloneData* data =
static_cast<ConsoleStructuredCloneData*>(aClosure);
MOZ_ASSERT(data);
if (aTag == CONSOLE_TAG_BLOB) {
MOZ_ASSERT(data->mFiles.Length() > aIndex);
JS::Rooted<JS::Value> val(aCx);
{
nsRefPtr<File> file =
new File(data->mParent, data->mFiles.ElementAt(aIndex));
if (!GetOrCreateDOMReflector(aCx, file, &val)) {
return nullptr;
}
}
return &val.toObject();
}
MOZ_CRASH("No other tags are supported.");
return nullptr;
}
// This method is called by the Structured Clone Algorithm when some data has
// to be written.
static bool
ConsoleStructuredCloneCallbacksWrite(JSContext* aCx,
JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj,
void* aClosure)
{
ConsoleStructuredCloneData* data =
static_cast<ConsoleStructuredCloneData*>(aClosure);
MOZ_ASSERT(data);
nsRefPtr<File> file;
if (NS_SUCCEEDED(UNWRAP_OBJECT(Blob, aObj, file)) &&
file->Impl()->MayBeClonedToOtherThreads()) {
if (!JS_WriteUint32Pair(aWriter, CONSOLE_TAG_BLOB, data->mFiles.Length())) {
return false;
}
data->mFiles.AppendElement(file->Impl());
return true;
}
JS::Rooted<JS::Value> value(aCx, JS::ObjectOrNullValue(aObj));
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, value));
if (!jsString) {
return false;
}
if (!JS_WriteString(aWriter, jsString)) {
return false;
}
return true;
}
static void
ConsoleStructuredCloneCallbacksError(JSContext* /* aCx */,
uint32_t /* aErrorId */)
{
NS_WARNING("Failed to clone data for the Console API in workers.");
}
static const JSStructuredCloneCallbacks gConsoleCallbacks = {
ConsoleStructuredCloneCallbacksRead,
ConsoleStructuredCloneCallbacksWrite,
ConsoleStructuredCloneCallbacksError
};
class ConsoleCallData final
{
public:
ConsoleCallData()
: mMethodName(Console::MethodLog)
, mPrivate(false)
, mTimeStamp(JS_Now() / PR_USEC_PER_MSEC)
, mIDType(eUnknown)
, mOuterIDNumber(0)
, mInnerIDNumber(0)
{ }
void
Initialize(JSContext* aCx, Console::MethodName aName,
const nsAString& aString, const Sequence<JS::Value>& aArguments)
{
mGlobal = JS::CurrentGlobalOrNull(aCx);
mMethodName = aName;
mMethodString = aString;
for (uint32_t i = 0; i < aArguments.Length(); ++i) {
mArguments.AppendElement(aArguments[i]);
}
}
void
SetIDs(uint64_t aOuterID, uint64_t aInnerID)
{
MOZ_ASSERT(mIDType == eUnknown);
mOuterIDNumber = aOuterID;
mInnerIDNumber = aInnerID;
mIDType = eNumber;
}
void
SetIDs(const nsAString& aOuterID, const nsAString& aInnerID)
{
MOZ_ASSERT(mIDType == eUnknown);
mOuterIDString = aOuterID;
mInnerIDString = aInnerID;
mIDType = eString;
}
void
CleanupJSObjects()
{
mArguments.Clear();
mGlobal = nullptr;
}
JS::Heap<JSObject*> mGlobal;
Console::MethodName mMethodName;
bool mPrivate;
int64_t mTimeStamp;
DOMHighResTimeStamp mMonotonicTimer;
// The concept of outerID and innerID is misleading because when a
// ConsoleCallData is created from a window, these are the window IDs, but
// when the object is created from a SharedWorker, a ServiceWorker or a
// subworker of a ChromeWorker these IDs are the type of worker and the
// filename of the callee.
// In Console.jsm the ID is 'jsm'.
enum {
eString,
eNumber,
eUnknown
} mIDType;
uint64_t mOuterIDNumber;
nsString mOuterIDString;
uint64_t mInnerIDNumber;
nsString mInnerIDString;
nsString mMethodString;
nsTArray<JS::Heap<JS::Value>> mArguments;
// Stack management is complicated, because we want to do it as
// lazily as possible. Therefore, we have the following behavior:
// 1) mTopStackFrame is initialized whenever we have any JS on the stack
// 2) mReifiedStack is initialized if we're created in a worker.
// 3) mStack is set (possibly to null if there is no JS on the stack) if
// we're created on main thread.
Maybe<ConsoleStackEntry> mTopStackFrame;
Maybe<nsTArray<ConsoleStackEntry>> mReifiedStack;
nsCOMPtr<nsIStackFrame> mStack;
};
// This class is used to clear any exception at the end of this method.
class ClearException
{
public:
explicit ClearException(JSContext* aCx)
: mCx(aCx)
{
}
~ClearException()
{
JS_ClearPendingException(mCx);
}
private:
JSContext* mCx;
};
class ConsoleRunnable : public nsRunnable
{
public:
explicit ConsoleRunnable(Console* aConsole)
: mWorkerPrivate(GetCurrentThreadWorkerPrivate())
, mConsole(aConsole)
{
MOZ_ASSERT(mWorkerPrivate);
}
virtual
~ConsoleRunnable()
{
}
bool
Dispatch()
{
mWorkerPrivate->AssertIsOnWorkerThread();
JSContext* cx = mWorkerPrivate->GetJSContext();
if (!PreDispatch(cx)) {
return false;
}
AutoSyncLoopHolder syncLoop(mWorkerPrivate);
mSyncLoopTarget = syncLoop.EventTarget();
if (NS_FAILED(NS_DispatchToMainThread(this))) {
JS_ReportError(cx,
"Failed to dispatch to main thread for the Console API!");
return false;
}
return syncLoop.Run();
}
private:
NS_IMETHOD Run()
{
AssertIsOnMainThread();
// Walk up to our containing page
WorkerPrivate* wp = mWorkerPrivate;
while (wp->GetParent()) {
wp = wp->GetParent();
}
nsPIDOMWindow* window = wp->GetWindow();
if (!window) {
RunWindowless();
} else {
RunWithWindow(window);
}
nsRefPtr<MainThreadStopSyncLoopRunnable> response =
new MainThreadStopSyncLoopRunnable(mWorkerPrivate,
mSyncLoopTarget.forget(),
true);
if (!response->Dispatch(nullptr)) {
NS_WARNING("Failed to dispatch response!");
}
return NS_OK;
}
void
RunWithWindow(nsPIDOMWindow* aWindow)
{
AutoJSAPI jsapi;
MOZ_ASSERT(aWindow);
nsRefPtr<nsGlobalWindow> win = static_cast<nsGlobalWindow*>(aWindow);
if (NS_WARN_IF(!jsapi.Init(win))) {
return;
}
MOZ_ASSERT(aWindow->IsInnerWindow());
nsPIDOMWindow* outerWindow = aWindow->GetOuterWindow();
MOZ_ASSERT(outerWindow);
RunConsole(jsapi.cx(), outerWindow, aWindow);
}
void
RunWindowless()
{
WorkerPrivate* wp = mWorkerPrivate;
while (wp->GetParent()) {
wp = wp->GetParent();
}
MOZ_ASSERT(!wp->GetWindow());
AutoSafeJSContext cx;
nsCOMPtr<nsIXPConnectJSObjectHolder> sandbox =
mConsole->GetOrCreateSandbox(cx, wp->GetPrincipal());
if (NS_WARN_IF(!sandbox)) {
return;
}
JS::Rooted<JSObject*> global(cx, sandbox->GetJSObject());
if (NS_WARN_IF(!global)) {
return;
}
// The CreateSandbox call returns a proxy to the actual sandbox object. We
// don't need a proxy here.
global = js::UncheckedUnwrap(global);
JSAutoCompartment ac(cx, global);
RunConsole(cx, nullptr, nullptr);
}
protected:
virtual bool
PreDispatch(JSContext* aCx) = 0;
virtual void
RunConsole(JSContext* aCx, nsPIDOMWindow* aOuterWindow,
nsPIDOMWindow* aInnerWindow) = 0;
WorkerPrivate* mWorkerPrivate;
// Raw pointer because this method is async and this object is kept alive by
// the caller.
Console* mConsole;
private:
nsCOMPtr<nsIEventTarget> mSyncLoopTarget;
};
// This runnable appends a CallData object into the Console queue running on
// the main-thread.
class ConsoleCallDataRunnable final : public ConsoleRunnable
{
public:
ConsoleCallDataRunnable(Console* aConsole,
ConsoleCallData* aCallData)
: ConsoleRunnable(aConsole)
, mCallData(aCallData)
{ }
private:
~ConsoleCallDataRunnable()
{ }
bool
PreDispatch(JSContext* aCx) override
{
mWorkerPrivate->AssertIsOnWorkerThread();
ClearException ce(aCx);
JSAutoCompartment ac(aCx, mCallData->mGlobal);
JS::Rooted<JSObject*> arguments(aCx,
JS_NewArrayObject(aCx, mCallData->mArguments.Length()));
if (!arguments) {
return false;
}
JS::Rooted<JS::Value> arg(aCx);
for (uint32_t i = 0; i < mCallData->mArguments.Length(); ++i) {
arg = mCallData->mArguments[i];
if (!JS_DefineElement(aCx, arguments, i, arg, JSPROP_ENUMERATE)) {
return false;
}
}
JS::Rooted<JS::Value> value(aCx, JS::ObjectValue(*arguments));
if (!mArguments.write(aCx, value, &gConsoleCallbacks, &mData)) {
return false;
}
mCallData->CleanupJSObjects();
return true;
}
void
RunConsole(JSContext* aCx, nsPIDOMWindow* aOuterWindow,
nsPIDOMWindow* aInnerWindow) override
{
MOZ_ASSERT(NS_IsMainThread());
// The windows have to run in parallel.
MOZ_ASSERT(!!aOuterWindow == !!aInnerWindow);
if (aOuterWindow) {
mCallData->SetIDs(aOuterWindow->WindowID(), aInnerWindow->WindowID());
} else {
ConsoleStackEntry frame;
if (mCallData->mTopStackFrame) {
frame = *mCallData->mTopStackFrame;
}
nsString id;
if (mWorkerPrivate->IsSharedWorker()) {
id = NS_LITERAL_STRING("SharedWorker");
} else if (mWorkerPrivate->IsServiceWorker()) {
id = NS_LITERAL_STRING("ServiceWorker");
} else {
id = NS_LITERAL_STRING("Worker");
}
mCallData->SetIDs(id, frame.mFilename);
}
// Now we could have the correct window (if we are not window-less).
mData.mParent = aInnerWindow;
ProcessCallData(aCx);
mCallData->CleanupJSObjects();
mData.mParent = nullptr;
}
private:
void
ProcessCallData(JSContext* aCx)
{
ClearException ce(aCx);
JS::Rooted<JS::Value> argumentsValue(aCx);
if (!mArguments.read(aCx, &argumentsValue, &gConsoleCallbacks, &mData)) {
return;
}
MOZ_ASSERT(argumentsValue.isObject());
JS::Rooted<JSObject*> argumentsObj(aCx, &argumentsValue.toObject());
MOZ_ASSERT(JS_IsArrayObject(aCx, argumentsObj));
uint32_t length;
if (!JS_GetArrayLength(aCx, argumentsObj, &length)) {
return;
}
for (uint32_t i = 0; i < length; ++i) {
JS::Rooted<JS::Value> value(aCx);
if (!JS_GetElement(aCx, argumentsObj, i, &value)) {
return;
}
mCallData->mArguments.AppendElement(value);
}
MOZ_ASSERT(mCallData->mArguments.Length() == length);
mCallData->mGlobal = JS::CurrentGlobalOrNull(aCx);
mConsole->ProcessCallData(mCallData);
}
ConsoleCallData* mCallData;
JSAutoStructuredCloneBuffer mArguments;
ConsoleStructuredCloneData mData;
};
// This runnable calls ProfileMethod() on the console on the main-thread.
class ConsoleProfileRunnable final : public ConsoleRunnable
{
public:
ConsoleProfileRunnable(Console* aConsole, const nsAString& aAction,
const Sequence<JS::Value>& aArguments)
: ConsoleRunnable(aConsole)
, mAction(aAction)
, mArguments(aArguments)
{
MOZ_ASSERT(aConsole);
}
private:
bool
PreDispatch(JSContext* aCx) override
{
ClearException ce(aCx);
JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));
if (!global) {
return false;
}
JSAutoCompartment ac(aCx, global);
JS::Rooted<JSObject*> arguments(aCx,
JS_NewArrayObject(aCx, mArguments.Length()));
if (!arguments) {
return false;
}
JS::Rooted<JS::Value> arg(aCx);
for (uint32_t i = 0; i < mArguments.Length(); ++i) {
arg = mArguments[i];
if (!JS_DefineElement(aCx, arguments, i, arg, JSPROP_ENUMERATE)) {
return false;
}
}
JS::Rooted<JS::Value> value(aCx, JS::ObjectValue(*arguments));
if (!mBuffer.write(aCx, value, &gConsoleCallbacks, &mData)) {
return false;
}
return true;
}
void
RunConsole(JSContext* aCx, nsPIDOMWindow* aOuterWindow,
nsPIDOMWindow* aInnerWindow) override
{
ClearException ce(aCx);
// Now we could have the correct window (if we are not window-less).
mData.mParent = aInnerWindow;
JS::Rooted<JS::Value> argumentsValue(aCx);
bool ok = mBuffer.read(aCx, &argumentsValue, &gConsoleCallbacks, &mData);
mData.mParent = nullptr;
if (!ok) {
return;
}
MOZ_ASSERT(argumentsValue.isObject());
JS::Rooted<JSObject*> argumentsObj(aCx, &argumentsValue.toObject());
MOZ_ASSERT(JS_IsArrayObject(aCx, argumentsObj));
uint32_t length;
if (!JS_GetArrayLength(aCx, argumentsObj, &length)) {
return;
}
Sequence<JS::Value> arguments;
for (uint32_t i = 0; i < length; ++i) {
JS::Rooted<JS::Value> value(aCx);
if (!JS_GetElement(aCx, argumentsObj, i, &value)) {
return;
}
arguments.AppendElement(value);
}
mConsole->ProfileMethod(aCx, mAction, arguments);
}
nsString mAction;
Sequence<JS::Value> mArguments;
JSAutoStructuredCloneBuffer mBuffer;
ConsoleStructuredCloneData mData;
};
NS_IMPL_CYCLE_COLLECTION_CLASS(Console)
// We don't need to traverse/unlink mStorage and mSanbox because they are not
// CCed objects and they are only used on the main thread, even when this
// Console object is used on workers.
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Console)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mWindow)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Console)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Console)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(Console)
NS_IMPL_CYCLE_COLLECTING_RELEASE(Console)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Console)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
Console::Console(nsPIDOMWindow* aWindow)
: mWindow(aWindow)
, mOuterID(0)
, mInnerID(0)
{
if (mWindow) {
MOZ_ASSERT(mWindow->IsInnerWindow());
mInnerID = mWindow->WindowID();
nsPIDOMWindow* outerWindow = mWindow->GetOuterWindow();
MOZ_ASSERT(outerWindow);
mOuterID = outerWindow->WindowID();
}
if (NS_IsMainThread()) {
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->AddObserver(this, "inner-window-destroyed", false);
}
}
mozilla::HoldJSObjects(this);
}
Console::~Console()
{
if (!NS_IsMainThread()) {
nsCOMPtr<nsIThread> mainThread;
NS_GetMainThread(getter_AddRefs(mainThread));
if (mStorage) {
nsIConsoleAPIStorage* storage;
mStorage.forget(&storage);
NS_ProxyRelease(mainThread, storage, false);
}
if (mSandbox) {
nsIXPConnectJSObjectHolder* sandbox;
mSandbox.forget(&sandbox);
NS_ProxyRelease(mainThread, sandbox, false);
}
}
mozilla::DropJSObjects(this);
}
NS_IMETHODIMP
Console::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData)
{
MOZ_ASSERT(NS_IsMainThread());
if (strcmp(aTopic, "inner-window-destroyed")) {
return NS_OK;
}
nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
uint64_t innerID;
nsresult rv = wrapper->GetData(&innerID);
NS_ENSURE_SUCCESS(rv, rv);
if (innerID == mInnerID) {
nsCOMPtr<nsIObserverService> obs =
do_GetService("@mozilla.org/observer-service;1");
if (obs) {
obs->RemoveObserver(this, "inner-window-destroyed");
}
mTimerRegistry.Clear();
}
return NS_OK;
}
JSObject*
Console::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return ConsoleBinding::Wrap(aCx, this, aGivenProto);
}
#define METHOD(name, string) \
void \
Console::name(JSContext* aCx, const Sequence<JS::Value>& aData) \
{ \
Method(aCx, Method##name, NS_LITERAL_STRING(string), aData); \
}
METHOD(Log, "log")
METHOD(Info, "info")
METHOD(Warn, "warn")
METHOD(Error, "error")
METHOD(Exception, "exception")
METHOD(Debug, "debug")
METHOD(Table, "table")
void
Console::Trace(JSContext* aCx)
{
const Sequence<JS::Value> data;
Method(aCx, MethodTrace, NS_LITERAL_STRING("trace"), data);
}
// Displays an interactive listing of all the properties of an object.
METHOD(Dir, "dir");
METHOD(Group, "group")
METHOD(GroupCollapsed, "groupCollapsed")
METHOD(GroupEnd, "groupEnd")
void
Console::Time(JSContext* aCx, const JS::Handle<JS::Value> aTime)
{
Sequence<JS::Value> data;
SequenceRooter<JS::Value> rooter(aCx, &data);
if (!aTime.isUndefined()) {
data.AppendElement(aTime);
}
Method(aCx, MethodTime, NS_LITERAL_STRING("time"), data);
}
void
Console::TimeEnd(JSContext* aCx, const JS::Handle<JS::Value> aTime)
{
Sequence<JS::Value> data;
SequenceRooter<JS::Value> rooter(aCx, &data);
if (!aTime.isUndefined()) {
data.AppendElement(aTime);
}
Method(aCx, MethodTimeEnd, NS_LITERAL_STRING("timeEnd"), data);
}
void
Console::Profile(JSContext* aCx, const Sequence<JS::Value>& aData)
{
ProfileMethod(aCx, NS_LITERAL_STRING("profile"), aData);
}
void
Console::ProfileEnd(JSContext* aCx, const Sequence<JS::Value>& aData)
{
ProfileMethod(aCx, NS_LITERAL_STRING("profileEnd"), aData);
}
void
Console::ProfileMethod(JSContext* aCx, const nsAString& aAction,
const Sequence<JS::Value>& aData)
{
if (!NS_IsMainThread()) {
// Here we are in a worker thread.
nsRefPtr<ConsoleProfileRunnable> runnable =
new ConsoleProfileRunnable(this, aAction, aData);
runnable->Dispatch();
return;
}
ClearException ce(aCx);
RootedDictionary<ConsoleProfileEvent> event(aCx);
event.mAction = aAction;
event.mArguments.Construct();
Sequence<JS::Value>& sequence = event.mArguments.Value();
for (uint32_t i = 0; i < aData.Length(); ++i) {
sequence.AppendElement(aData[i]);
}
JS::Rooted<JS::Value> eventValue(aCx);
if (!ToJSValue(aCx, event, &eventValue)) {
return;
}
JS::Rooted<JSObject*> eventObj(aCx, &eventValue.toObject());
MOZ_ASSERT(eventObj);
if (!JS_DefineProperty(aCx, eventObj, "wrappedJSObject", eventValue,
JSPROP_ENUMERATE)) {
return;
}
nsXPConnect* xpc = nsXPConnect::XPConnect();
nsCOMPtr<nsISupports> wrapper;
const nsIID& iid = NS_GET_IID(nsISupports);
if (NS_FAILED(xpc->WrapJS(aCx, eventObj, iid, getter_AddRefs(wrapper)))) {
return;
}
nsCOMPtr<nsIObserverService> obs =
do_GetService("@mozilla.org/observer-service;1");
if (obs) {
obs->NotifyObservers(wrapper, "console-api-profiler", nullptr);
}
}
void
Console::Assert(JSContext* aCx, bool aCondition,
const Sequence<JS::Value>& aData)
{
if (!aCondition) {
Method(aCx, MethodAssert, NS_LITERAL_STRING("assert"), aData);
}
}
METHOD(Count, "count")
void
Console::NoopMethod()
{
// Nothing to do.
}
static
nsresult
StackFrameToStackEntry(nsIStackFrame* aStackFrame,
ConsoleStackEntry& aStackEntry,
uint32_t aLanguage)
{
MOZ_ASSERT(aStackFrame);
nsresult rv = aStackFrame->GetFilename(aStackEntry.mFilename);
NS_ENSURE_SUCCESS(rv, rv);
int32_t lineNumber;
rv = aStackFrame->GetLineNumber(&lineNumber);
NS_ENSURE_SUCCESS(rv, rv);
aStackEntry.mLineNumber = lineNumber;
int32_t columnNumber;
rv = aStackFrame->GetColumnNumber(&columnNumber);
NS_ENSURE_SUCCESS(rv, rv);
aStackEntry.mColumnNumber = columnNumber;
rv = aStackFrame->GetName(aStackEntry.mFunctionName);
NS_ENSURE_SUCCESS(rv, rv);
aStackEntry.mLanguage = aLanguage;
return NS_OK;
}
static
nsresult
ReifyStack(nsIStackFrame* aStack, nsTArray<ConsoleStackEntry>& aRefiedStack)
{
nsCOMPtr<nsIStackFrame> stack(aStack);
while (stack) {
uint32_t language;
nsresult rv = stack->GetLanguage(&language);
NS_ENSURE_SUCCESS(rv, rv);
if (language == nsIProgrammingLanguage::JAVASCRIPT) {
ConsoleStackEntry& data = *aRefiedStack.AppendElement();
rv = StackFrameToStackEntry(stack, data, language);
NS_ENSURE_SUCCESS(rv, rv);
}
nsCOMPtr<nsIStackFrame> caller;
rv = stack->GetCaller(getter_AddRefs(caller));
NS_ENSURE_SUCCESS(rv, rv);
stack.swap(caller);
}
return NS_OK;
}
class ConsoleTimelineMarker : public TimelineMarker
{
public:
ConsoleTimelineMarker(nsDocShell* aDocShell,
TracingMetadata aMetaData,
const nsAString& aCause)
: TimelineMarker(aDocShell, "ConsoleTime", aMetaData, aCause)
{
if (aMetaData == TRACING_INTERVAL_END) {
CaptureStack();
}
}
virtual bool Equals(const TimelineMarker& aOther) override
{
if (!TimelineMarker::Equals(aOther)) {
return false;
}
// Console markers must have matching causes as well.
return GetCause() == aOther.GetCause();
}
virtual void AddDetails(mozilla::dom::ProfileTimelineMarker& aMarker) override
{
if (GetMetaData() == TRACING_INTERVAL_START) {
aMarker.mCauseName.Construct(GetCause());
} else {
aMarker.mEndStack = GetStack();
}
}
};
// Queue a call to a console method. See the CALL_DELAY constant.
void
Console::Method(JSContext* aCx, MethodName aMethodName,
const nsAString& aMethodString,
const Sequence<JS::Value>& aData)
{
nsAutoPtr<ConsoleCallData> callData(new ConsoleCallData());
ClearException ce(aCx);
callData->Initialize(aCx, aMethodName, aMethodString, aData);
if (mWindow) {
nsCOMPtr<nsIWebNavigation> webNav = do_GetInterface(mWindow);
if (!webNav) {
return;
}
nsCOMPtr<nsILoadContext> loadContext = do_QueryInterface(webNav);
MOZ_ASSERT(loadContext);
loadContext->GetUsePrivateBrowsing(&callData->mPrivate);
}
uint32_t maxDepth = ShouldIncludeStackTrace(aMethodName) ?
DEFAULT_MAX_STACKTRACE_DEPTH : 1;
nsCOMPtr<nsIStackFrame> stack = CreateStack(aCx, maxDepth);
if (!stack) {
return;
}
// Walk up to the first JS stack frame and save it if we find it.
do {
uint32_t language;
nsresult rv = stack->GetLanguage(&language);
if (NS_FAILED(rv)) {
return;
}
if (language == nsIProgrammingLanguage::JAVASCRIPT) {
callData->mTopStackFrame.emplace();
nsresult rv = StackFrameToStackEntry(stack,
*callData->mTopStackFrame,
language);
if (NS_FAILED(rv)) {
return;
}
break;
}
nsCOMPtr<nsIStackFrame> caller;
rv = stack->GetCaller(getter_AddRefs(caller));
if (NS_FAILED(rv)) {
return;
}
stack.swap(caller);
} while (stack);
if (NS_IsMainThread()) {
callData->mStack = stack;
} else {
// nsIStackFrame is not threadsafe, so we need to snapshot it now,
// before we post our runnable to the main thread.
callData->mReifiedStack.emplace();
nsresult rv = ReifyStack(stack, *callData->mReifiedStack);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
// Monotonic timer for 'time' and 'timeEnd'
if ((aMethodName == MethodTime || aMethodName == MethodTimeEnd)) {
if (mWindow) {
nsGlobalWindow *win = static_cast<nsGlobalWindow*>(mWindow.get());
MOZ_ASSERT(win);
nsRefPtr<nsPerformance> performance = win->GetPerformance();
if (!performance) {
return;
}
callData->mMonotonicTimer = performance->Now();
// 'time' and 'timeEnd' are displayed in the devtools timeline if active.
bool isTimelineRecording = false;
nsDocShell* docShell = static_cast<nsDocShell*>(mWindow->GetDocShell());
if (docShell) {
docShell->GetRecordProfileTimelineMarkers(&isTimelineRecording);
}
if (isTimelineRecording && aData.Length() == 1) {
JS::Rooted<JS::Value> value(aCx, aData[0]);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, value));
if (jsString) {
nsAutoJSString key;
if (key.init(aCx, jsString)) {
mozilla::UniquePtr<TimelineMarker> marker =
MakeUnique<ConsoleTimelineMarker>(docShell,
aMethodName == MethodTime ? TRACING_INTERVAL_START : TRACING_INTERVAL_END,
key);
docShell->AddProfileTimelineMarker(Move(marker));
}
}
}
} else {
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
TimeDuration duration =
mozilla::TimeStamp::Now() - workerPrivate->CreationTimeStamp();
callData->mMonotonicTimer = duration.ToMilliseconds();
}
}
if (NS_IsMainThread()) {
callData->SetIDs(mOuterID, mInnerID);
ProcessCallData(callData);
return;
}
// Note: we can pass the reference of callData because this runnable calls
// ProcessCallData() synchronously.
nsRefPtr<ConsoleCallDataRunnable> runnable =
new ConsoleCallDataRunnable(this, callData);
runnable->Dispatch();
}
// We store information to lazily compute the stack in the reserved slots of
// LazyStackGetter. The first slot always stores a JS object: it's either the
// JS wrapper of the nsIStackFrame or the actual reified stack representation.
// The second slot is a PrivateValue() holding an nsIStackFrame* when we haven't
// reified the stack yet, or an UndefinedValue() otherwise.
enum {
SLOT_STACKOBJ,
SLOT_RAW_STACK
};
bool
LazyStackGetter(JSContext* aCx, unsigned aArgc, JS::Value* aVp)
{
JS::CallArgs args = CallArgsFromVp(aArgc, aVp);
JS::Rooted<JSObject*> callee(aCx, &args.callee());
JS::Value v = js::GetFunctionNativeReserved(&args.callee(), SLOT_RAW_STACK);
if (v.isUndefined()) {
// Already reified.
args.rval().set(js::GetFunctionNativeReserved(callee, SLOT_STACKOBJ));
return true;
}
nsIStackFrame* stack = reinterpret_cast<nsIStackFrame*>(v.toPrivate());
nsTArray<ConsoleStackEntry> reifiedStack;
nsresult rv = ReifyStack(stack, reifiedStack);
if (NS_FAILED(rv)) {
Throw(aCx, rv);
return false;
}
JS::Rooted<JS::Value> stackVal(aCx);
if (!ToJSValue(aCx, reifiedStack, &stackVal)) {
return false;
}
MOZ_ASSERT(stackVal.isObject());
js::SetFunctionNativeReserved(callee, SLOT_STACKOBJ, stackVal);
js::SetFunctionNativeReserved(callee, SLOT_RAW_STACK, JS::UndefinedValue());
args.rval().set(stackVal);
return true;
}
void
Console::ProcessCallData(ConsoleCallData* aData)
{
MOZ_ASSERT(aData);
MOZ_ASSERT(NS_IsMainThread());
ConsoleStackEntry frame;
if (aData->mTopStackFrame) {
frame = *aData->mTopStackFrame;
}
AutoSafeJSContext cx;
ClearException ce(cx);
RootedDictionary<ConsoleEvent> event(cx);
JSAutoCompartment ac(cx, aData->mGlobal);
event.mID.Construct();
event.mInnerID.Construct();
MOZ_ASSERT(aData->mIDType != ConsoleCallData::eUnknown);
if (aData->mIDType == ConsoleCallData::eString) {
event.mID.Value().SetAsString() = aData->mOuterIDString;
event.mInnerID.Value().SetAsString() = aData->mInnerIDString;
} else {
MOZ_ASSERT(aData->mIDType == ConsoleCallData::eNumber);
event.mID.Value().SetAsUnsignedLongLong() = aData->mOuterIDNumber;
event.mInnerID.Value().SetAsUnsignedLongLong() = aData->mInnerIDNumber;
}
event.mLevel = aData->mMethodString;
event.mFilename = frame.mFilename;
event.mLineNumber = frame.mLineNumber;
event.mColumnNumber = frame.mColumnNumber;
event.mFunctionName = frame.mFunctionName;
event.mTimeStamp = aData->mTimeStamp;
event.mPrivate = aData->mPrivate;
switch (aData->mMethodName) {
case MethodLog:
case MethodInfo:
case MethodWarn:
case MethodError:
case MethodException:
case MethodDebug:
case MethodAssert:
event.mArguments.Construct();
event.mStyles.Construct();
ProcessArguments(cx, aData->mArguments, event.mArguments.Value(),
event.mStyles.Value());
break;
default:
event.mArguments.Construct();
ArgumentsToValueList(aData->mArguments, event.mArguments.Value());
}
if (aData->mMethodName == MethodGroup ||
aData->mMethodName == MethodGroupCollapsed ||
aData->mMethodName == MethodGroupEnd) {
ComposeGroupName(cx, aData->mArguments, event.mGroupName);
}
else if (aData->mMethodName == MethodTime && !aData->mArguments.IsEmpty()) {
event.mTimer = StartTimer(cx, aData->mArguments[0], aData->mMonotonicTimer);
}
else if (aData->mMethodName == MethodTimeEnd && !aData->mArguments.IsEmpty()) {
event.mTimer = StopTimer(cx, aData->mArguments[0], aData->mMonotonicTimer);
}
else if (aData->mMethodName == MethodCount) {
event.mCounter = IncreaseCounter(cx, frame, aData->mArguments);
}
// We want to create a console event object and pass it to our
// nsIConsoleAPIStorage implementation. We want to define some accessor
// properties on this object, and those will need to keep an nsIStackFrame
// alive. But nsIStackFrame cannot be wrapped in an untrusted scope. And
// further, passing untrusted objects to system code is likely to run afoul of
// Object Xrays. So we want to wrap in a system-principal scope here. But
// which one? We could cheat and try to get the underlying JSObject* of
// mStorage, but that's a bit fragile. Instead, we just use the junk scope,
// with explicit permission from the XPConnect module owner. If you're
// tempted to do that anywhere else, talk to said module owner first.
JSAutoCompartment ac2(cx, xpc::PrivilegedJunkScope());
JS::Rooted<JS::Value> eventValue(cx);
if (!ToJSValue(cx, event, &eventValue)) {
return;
}
JS::Rooted<JSObject*> eventObj(cx, &eventValue.toObject());
MOZ_ASSERT(eventObj);
if (!JS_DefineProperty(cx, eventObj, "wrappedJSObject", eventValue, JSPROP_ENUMERATE)) {
return;
}
if (ShouldIncludeStackTrace(aData->mMethodName)) {
// Now define the "stacktrace" property on eventObj. There are two cases
// here. Either we came from a worker and have a reified stack, or we want
// to define a getter that will lazily reify the stack.
if (aData->mReifiedStack) {
JS::Rooted<JS::Value> stacktrace(cx);
if (!ToJSValue(cx, *aData->mReifiedStack, &stacktrace) ||
!JS_DefineProperty(cx, eventObj, "stacktrace", stacktrace,
JSPROP_ENUMERATE)) {
return;
}
} else {
JSFunction* fun = js::NewFunctionWithReserved(cx, LazyStackGetter, 0, 0,
"stacktrace");
if (!fun) {
return;
}
JS::Rooted<JSObject*> funObj(cx, JS_GetFunctionObject(fun));
// We want to store our stack in the function and have it stay alive. But
// we also need sane access to the C++ nsIStackFrame. So store both a JS
// wrapper and the raw pointer: the former will keep the latter alive.
JS::Rooted<JS::Value> stackVal(cx);
nsresult rv = nsContentUtils::WrapNative(cx, aData->mStack,
&stackVal);
if (NS_FAILED(rv)) {
return;
}
js::SetFunctionNativeReserved(funObj, SLOT_STACKOBJ, stackVal);
js::SetFunctionNativeReserved(funObj, SLOT_RAW_STACK,
JS::PrivateValue(aData->mStack.get()));
if (!JS_DefineProperty(cx, eventObj, "stacktrace",
JS::UndefinedHandleValue,
JSPROP_ENUMERATE | JSPROP_SHARED | JSPROP_GETTER |
JSPROP_SETTER,
JS_DATA_TO_FUNC_PTR(JSNative, funObj.get()),
nullptr)) {
return;
}
}
}
if (!mStorage) {
mStorage = do_GetService("@mozilla.org/consoleAPI-storage;1");
}
if (!mStorage) {
NS_WARNING("Failed to get the ConsoleAPIStorage service.");
return;
}
nsAutoString innerID, outerID;
MOZ_ASSERT(aData->mIDType != ConsoleCallData::eUnknown);
if (aData->mIDType == ConsoleCallData::eString) {
outerID = aData->mOuterIDString;
innerID = aData->mInnerIDString;
} else {
MOZ_ASSERT(aData->mIDType == ConsoleCallData::eNumber);
outerID.AppendInt(aData->mOuterIDNumber);
innerID.AppendInt(aData->mInnerIDNumber);
}
if (NS_FAILED(mStorage->RecordEvent(innerID, outerID, eventValue))) {
NS_WARNING("Failed to record a console event.");
}
}
void
Console::ProcessArguments(JSContext* aCx,
const nsTArray<JS::Heap<JS::Value>>& aData,
Sequence<JS::Value>& aSequence,
Sequence<JS::Value>& aStyles)
{
if (aData.IsEmpty()) {
return;
}
if (aData.Length() == 1 || !aData[0].isString()) {
ArgumentsToValueList(aData, aSequence);
return;
}
JS::Rooted<JS::Value> format(aCx, aData[0]);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, format));
if (!jsString) {
return;
}
nsAutoJSString string;
if (!string.init(aCx, jsString)) {
return;
}
nsString::const_iterator start, end;
string.BeginReading(start);
string.EndReading(end);
nsString output;
uint32_t index = 1;
while (start != end) {
if (*start != '%') {
output.Append(*start);
++start;
continue;
}
++start;
if (start == end) {
output.Append('%');
break;
}
if (*start == '%') {
output.Append(*start);
++start;
continue;
}
nsAutoString tmp;
tmp.Append('%');
int32_t integer = -1;
int32_t mantissa = -1;
// Let's parse %<number>.<number> for %d and %f
if (*start >= '0' && *start <= '9') {
integer = 0;
do {
integer = integer * 10 + *start - '0';
tmp.Append(*start);
++start;
} while (*start >= '0' && *start <= '9' && start != end);
}
if (start == end) {
output.Append(tmp);
break;
}
if (*start == '.') {
tmp.Append(*start);
++start;
if (start == end) {
output.Append(tmp);
break;
}
// '.' must be followed by a number.
if (*start < '0' || *start > '9') {
output.Append(tmp);
continue;
}
mantissa = 0;
do {
mantissa = mantissa * 10 + *start - '0';
tmp.Append(*start);
++start;
} while (*start >= '0' && *start <= '9' && start != end);
if (start == end) {
output.Append(tmp);
break;
}
}
char ch = *start;
tmp.Append(ch);
++start;
switch (ch) {
case 'o':
case 'O':
{
if (!output.IsEmpty()) {
JS::Rooted<JSString*> str(aCx, JS_NewUCStringCopyN(aCx,
output.get(),
output.Length()));
if (!str) {
return;
}
aSequence.AppendElement(JS::StringValue(str));
output.Truncate();
}
JS::Rooted<JS::Value> v(aCx);
if (index < aData.Length()) {
v = aData[index++];
}
aSequence.AppendElement(v);
break;
}
case 'c':
{
if (!output.IsEmpty()) {
JS::Rooted<JSString*> str(aCx, JS_NewUCStringCopyN(aCx,
output.get(),
output.Length()));
if (!str) {
return;
}
aSequence.AppendElement(JS::StringValue(str));
output.Truncate();
}
if (index < aData.Length()) {
JS::Rooted<JS::Value> v(aCx, aData[index++]);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, v));
if (!jsString) {
return;
}
int32_t diff = aSequence.Length() - aStyles.Length();
if (diff > 0) {
for (int32_t i = 0; i < diff; i++) {
aStyles.AppendElement(JS::NullValue());
}
}
aStyles.AppendElement(JS::StringValue(jsString));
}
break;
}
case 's':
if (index < aData.Length()) {
JS::Rooted<JS::Value> value(aCx, aData[index++]);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, value));
if (!jsString) {
return;
}
nsAutoJSString v;
if (!v.init(aCx, jsString)) {
return;
}
output.Append(v);
}
break;
case 'd':
case 'i':
if (index < aData.Length()) {
JS::Rooted<JS::Value> value(aCx, aData[index++]);
int32_t v;
if (!JS::ToInt32(aCx, value, &v)) {
return;
}
nsCString format;
MakeFormatString(format, integer, mantissa, 'd');
output.AppendPrintf(format.get(), v);
}
break;
case 'f':
if (index < aData.Length()) {
JS::Rooted<JS::Value> value(aCx, aData[index++]);
double v;
if (!JS::ToNumber(aCx, value, &v)) {
return;
}
nsCString format;
MakeFormatString(format, integer, mantissa, 'f');
output.AppendPrintf(format.get(), v);
}
break;
default:
output.Append(tmp);
break;
}
}
if (!output.IsEmpty()) {
JS::Rooted<JSString*> str(aCx, JS_NewUCStringCopyN(aCx, output.get(),
output.Length()));
if (!str) {
return;
}
aSequence.AppendElement(JS::StringValue(str));
}
// The rest of the array, if unused by the format string.
for (; index < aData.Length(); ++index) {
aSequence.AppendElement(aData[index]);
}
}
void
Console::MakeFormatString(nsCString& aFormat, int32_t aInteger,
int32_t aMantissa, char aCh)
{
aFormat.Append('%');
if (aInteger >= 0) {
aFormat.AppendInt(aInteger);
}
if (aMantissa >= 0) {
aFormat.Append('.');
aFormat.AppendInt(aMantissa);
}
aFormat.Append(aCh);
}
void
Console::ComposeGroupName(JSContext* aCx,
const nsTArray<JS::Heap<JS::Value>>& aData,
nsAString& aName)
{
for (uint32_t i = 0; i < aData.Length(); ++i) {
if (i != 0) {
aName.AppendASCII(" ");
}
JS::Rooted<JS::Value> value(aCx, aData[i]);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, value));
if (!jsString) {
return;
}
nsAutoJSString string;
if (!string.init(aCx, jsString)) {
return;
}
aName.Append(string);
}
}
JS::Value
Console::StartTimer(JSContext* aCx, const JS::Value& aName,
DOMHighResTimeStamp aTimestamp)
{
if (mTimerRegistry.Count() >= MAX_PAGE_TIMERS) {
RootedDictionary<ConsoleTimerError> error(aCx);
JS::Rooted<JS::Value> value(aCx);
if (!ToJSValue(aCx, error, &value)) {
return JS::UndefinedValue();
}
return value;
}
RootedDictionary<ConsoleTimerStart> timer(aCx);
JS::Rooted<JS::Value> name(aCx, aName);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, name));
if (!jsString) {
return JS::UndefinedValue();
}
nsAutoJSString key;
if (!key.init(aCx, jsString)) {
return JS::UndefinedValue();
}
timer.mName = key;
DOMHighResTimeStamp entry;
if (!mTimerRegistry.Get(key, &entry)) {
mTimerRegistry.Put(key, aTimestamp);
} else {
aTimestamp = entry;
}
timer.mStarted = aTimestamp;
JS::Rooted<JS::Value> value(aCx);
if (!ToJSValue(aCx, timer, &value)) {
return JS::UndefinedValue();
}
return value;
}
JS::Value
Console::StopTimer(JSContext* aCx, const JS::Value& aName,
DOMHighResTimeStamp aTimestamp)
{
JS::Rooted<JS::Value> name(aCx, aName);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, name));
if (!jsString) {
return JS::UndefinedValue();
}
nsAutoJSString key;
if (!key.init(aCx, jsString)) {
return JS::UndefinedValue();
}
DOMHighResTimeStamp entry;
if (!mTimerRegistry.Get(key, &entry)) {
return JS::UndefinedValue();
}
mTimerRegistry.Remove(key);
RootedDictionary<ConsoleTimerEnd> timer(aCx);
timer.mName = key;
timer.mDuration = aTimestamp - entry;
JS::Rooted<JS::Value> value(aCx);
if (!ToJSValue(aCx, timer, &value)) {
return JS::UndefinedValue();
}
return value;
}
void
Console::ArgumentsToValueList(const nsTArray<JS::Heap<JS::Value>>& aData,
Sequence<JS::Value>& aSequence)
{
for (uint32_t i = 0; i < aData.Length(); ++i) {
aSequence.AppendElement(aData[i]);
}
}
JS::Value
Console::IncreaseCounter(JSContext* aCx, const ConsoleStackEntry& aFrame,
const nsTArray<JS::Heap<JS::Value>>& aArguments)
{
ClearException ce(aCx);
nsAutoString key;
nsAutoString label;
if (!aArguments.IsEmpty()) {
JS::Rooted<JS::Value> labelValue(aCx, aArguments[0]);
JS::Rooted<JSString*> jsString(aCx, JS::ToString(aCx, labelValue));
nsAutoJSString string;
if (jsString && string.init(aCx, jsString)) {
label = string;
key = string;
}
}
if (key.IsEmpty()) {
key.Append(aFrame.mFilename);
key.Append(':');
key.AppendInt(aFrame.mLineNumber);
}
uint32_t count = 0;
if (!mCounterRegistry.Get(key, &count)) {
if (mCounterRegistry.Count() >= MAX_PAGE_COUNTERS) {
RootedDictionary<ConsoleCounterError> error(aCx);
JS::Rooted<JS::Value> value(aCx);
if (!ToJSValue(aCx, error, &value)) {
return JS::UndefinedValue();
}
return value;
}
}
++count;
mCounterRegistry.Put(key, count);
RootedDictionary<ConsoleCounter> data(aCx);
data.mLabel = label;
data.mCount = count;
JS::Rooted<JS::Value> value(aCx);
if (!ToJSValue(aCx, data, &value)) {
return JS::UndefinedValue();
}
return value;
}
bool
Console::ShouldIncludeStackTrace(MethodName aMethodName)
{
switch (aMethodName) {
case MethodError:
case MethodException:
case MethodAssert:
case MethodTrace:
return true;
default:
return false;
}
}
nsIXPConnectJSObjectHolder*
Console::GetOrCreateSandbox(JSContext* aCx, nsIPrincipal* aPrincipal)
{
MOZ_ASSERT(NS_IsMainThread());
if (!mSandbox) {
nsIXPConnect* xpc = nsContentUtils::XPConnect();
MOZ_ASSERT(xpc, "This should never be null!");
nsresult rv = xpc->CreateSandbox(aCx, aPrincipal,
getter_AddRefs(mSandbox));
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
}
return mSandbox;
}
} // namespace dom
} // namespace mozilla
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