C++ GlobalObject类代码示例

/*static*/ already_AddRefed<Response>
Response::Constructor(const GlobalObject& aGlobal,
                      const Optional<Nullable<fetch::ResponseBodyInit>>& aBody,
                      const ResponseInit& aInit, ErrorResult& aRv)
{
  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());

  if (aInit.mStatus < 200 || aInit.mStatus > 599) {
    aRv.ThrowRangeError<MSG_INVALID_RESPONSE_STATUSCODE_ERROR>();
    return nullptr;
  }

  // Check if the status text contains illegal characters
  nsACString::const_iterator start, end;
  aInit.mStatusText.BeginReading(start);
  aInit.mStatusText.EndReading(end);
  if (FindCharInReadable('\r', start, end)) {
    aRv.ThrowTypeError<MSG_RESPONSE_INVALID_STATUSTEXT_ERROR>();
    return nullptr;
  }
  // Reset iterator since FindCharInReadable advances it.
  aInit.mStatusText.BeginReading(start);
  if (FindCharInReadable('\n', start, end)) {
    aRv.ThrowTypeError<MSG_RESPONSE_INVALID_STATUSTEXT_ERROR>();
    return nullptr;
  }

  RefPtr<InternalResponse> internalResponse =
    new InternalResponse(aInit.mStatus, aInit.mStatusText);

  // Grab a valid channel info from the global so this response is 'valid' for
  // interception.
  if (NS_IsMainThread()) {
    ChannelInfo info;
    nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(global);
    if (window) {
      nsIDocument* doc = window->GetExtantDoc();
      MOZ_ASSERT(doc);
      info.InitFromDocument(doc);
    } else {
      info.InitFromChromeGlobal(global);
    }
    internalResponse->InitChannelInfo(info);
  } else {
    WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
    MOZ_ASSERT(worker);
    internalResponse->InitChannelInfo(worker->GetChannelInfo());
  }

  RefPtr<Response> r = new Response(global, internalResponse, nullptr);

  if (aInit.mHeaders.WasPassed()) {
    internalResponse->Headers()->Clear();

    // Instead of using Fill, create an object to allow the constructor to
    // unwrap the HeadersInit.
    RefPtr<Headers> headers =
      Headers::Create(global, aInit.mHeaders.Value(), aRv);
    if (aRv.Failed()) {
      return nullptr;
    }

    internalResponse->Headers()->Fill(*headers->GetInternalHeaders(), aRv);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }
  }

  if (aBody.WasPassed() && !aBody.Value().IsNull()) {
    if (aInit.mStatus == 204 || aInit.mStatus == 205 || aInit.mStatus == 304) {
      aRv.ThrowTypeError<MSG_RESPONSE_NULL_STATUS_WITH_BODY>();
      return nullptr;
    }

    nsCString contentTypeWithCharset;
    nsCOMPtr<nsIInputStream> bodyStream;
    int64_t bodySize = InternalResponse::UNKNOWN_BODY_SIZE;

    const fetch::ResponseBodyInit& body = aBody.Value().Value();
    if (body.IsReadableStream()) {
      aRv.MightThrowJSException();

      JSContext* cx = aGlobal.Context();
      const ReadableStream& readableStream = body.GetAsReadableStream();

      JS::Rooted<JSObject*> readableStreamObj(cx, readableStream.Obj());

      bool disturbed;
      bool locked;
      if (!JS::ReadableStreamIsDisturbed(cx, readableStreamObj, &disturbed) ||
          !JS::ReadableStreamIsLocked(cx, readableStreamObj, &locked)) {
        aRv.StealExceptionFromJSContext(cx);
        return nullptr;
      }
      if (disturbed || locked) {
        aRv.ThrowTypeError<MSG_FETCH_BODY_CONSUMED_ERROR>();
        return nullptr;
      }

      r->SetReadableStreamBody(cx, readableStreamObj);
//.........这里部分代码省略.........

// Automatically import functions in Module \p DestModule based on the summaries
// index.
//
bool FunctionImporter::importFunctions(
    Module &DestModule, const FunctionImporter::ImportMapTy &ImportList) {
  DEBUG(dbgs() << "Starting import for Module "
               << DestModule.getModuleIdentifier() << "\n");
  unsigned ImportedCount = 0;

  // Linker that will be used for importing function
  Linker TheLinker(DestModule);
  // Do the actual import of functions now, one Module at a time
  std::set<StringRef> ModuleNameOrderedList;
  for (auto &FunctionsToImportPerModule : ImportList) {
    ModuleNameOrderedList.insert(FunctionsToImportPerModule.first());
  }
  for (auto &Name : ModuleNameOrderedList) {
    // Get the module for the import
    const auto &FunctionsToImportPerModule = ImportList.find(Name);
    assert(FunctionsToImportPerModule != ImportList.end());
    std::unique_ptr<Module> SrcModule = ModuleLoader(Name);
    assert(&DestModule.getContext() == &SrcModule->getContext() &&
           "Context mismatch");

    // If modules were created with lazy metadata loading, materialize it
    // now, before linking it (otherwise this will be a noop).
    SrcModule->materializeMetadata();
    UpgradeDebugInfo(*SrcModule);

    auto &ImportGUIDs = FunctionsToImportPerModule->second;
    // Find the globals to import
    DenseSet<const GlobalValue *> GlobalsToImport;
    for (auto &GV : *SrcModule) {
      if (!GV.hasName())
        continue;
      auto GUID = GV.getGUID();
      auto Import = ImportGUIDs.count(GUID);
      DEBUG(dbgs() << (Import ? "Is" : "Not") << " importing " << GUID << " "
                   << GV.getName() << " from " << SrcModule->getSourceFileName()
                   << "\n");
      if (Import) {
        GV.materialize();
        GlobalsToImport.insert(&GV);
      }
    }
    for (auto &GV : SrcModule->globals()) {
      if (!GV.hasName())
        continue;
      auto GUID = GV.getGUID();
      auto Import = ImportGUIDs.count(GUID);
      DEBUG(dbgs() << (Import ? "Is" : "Not") << " importing " << GUID << " "
                   << GV.getName() << " from " << SrcModule->getSourceFileName()
                   << "\n");
      if (Import) {
        GV.materialize();
        GlobalsToImport.insert(&GV);
      }
    }
    for (auto &GV : SrcModule->aliases()) {
      if (!GV.hasName())
        continue;
      auto GUID = GV.getGUID();
      auto Import = ImportGUIDs.count(GUID);
      DEBUG(dbgs() << (Import ? "Is" : "Not") << " importing " << GUID << " "
                   << GV.getName() << " from " << SrcModule->getSourceFileName()
                   << "\n");
      if (Import) {
        // Alias can't point to "available_externally". However when we import
        // linkOnceODR the linkage does not change. So we import the alias
        // and aliasee only in this case.
        GlobalObject *GO = GV.getBaseObject();
        if (!GO->hasLinkOnceODRLinkage())
          continue;
#ifndef NDEBUG
        if (!GlobalsToImport.count(GO))
          DEBUG(dbgs() << " alias triggers importing aliasee " << GO->getGUID()
                       << " " << GO->getName() << " from "
                       << SrcModule->getSourceFileName() << "\n");
#endif
        GO->materialize();
        GlobalsToImport.insert(GO);
        GV.materialize();
        GlobalsToImport.insert(&GV);
      }
    }

    // Link in the specified functions.
    if (renameModuleForThinLTO(*SrcModule, Index, &GlobalsToImport))
      return true;

    if (PrintImports) {
      for (const auto *GV : GlobalsToImport)
        dbgs() << DestModule.getSourceFileName() << ": Import " << GV->getName()
               << " from " << SrcModule->getSourceFileName() << "\n";
    }

    if (TheLinker.linkInModule(std::move(SrcModule), Linker::Flags::None,
                               &GlobalsToImport))
      report_fatal_error("Function Import: link error");

//.........这里部分代码省略.........

/*static*/ already_AddRefed<Response>
Response::Constructor(const GlobalObject& aGlobal,
                      const Optional<ArrayBufferOrArrayBufferViewOrBlobOrScalarValueStringOrURLSearchParams>& aBody,
                      const ResponseInit& aInit, ErrorResult& aRv)
{
  if (aInit.mStatus < 200 || aInit.mStatus > 599) {
    aRv.Throw(NS_ERROR_RANGE_ERR);
    return nullptr;
  }

  nsCString statusText;
  if (aInit.mStatusText.WasPassed()) {
    statusText = aInit.mStatusText.Value();
    nsACString::const_iterator start, end;
    statusText.BeginReading(start);
    statusText.EndReading(end);
    if (FindCharInReadable('\r', start, end)) {
      aRv.ThrowTypeError(MSG_RESPONSE_INVALID_STATUSTEXT_ERROR);
      return nullptr;
    }
    // Reset iterator since FindCharInReadable advances it.
    statusText.BeginReading(start);
    if (FindCharInReadable('\n', start, end)) {
      aRv.ThrowTypeError(MSG_RESPONSE_INVALID_STATUSTEXT_ERROR);
      return nullptr;
    }
  } else {
    // Since we don't support default values for ByteString.
    statusText = NS_LITERAL_CSTRING("OK");
  }

  nsRefPtr<InternalResponse> internalResponse =
    new InternalResponse(aInit.mStatus, statusText);

  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
  nsRefPtr<Response> r = new Response(global, internalResponse);

  if (aInit.mHeaders.WasPassed()) {
    internalResponse->Headers()->Clear();

    // Instead of using Fill, create an object to allow the constructor to
    // unwrap the HeadersInit.
    nsRefPtr<Headers> headers =
      Headers::Constructor(aGlobal, aInit.mHeaders.Value(), aRv);
    if (aRv.Failed()) {
      return nullptr;
    }

    internalResponse->Headers()->Fill(*headers->GetInternalHeaders(), aRv);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }
  }

  if (aBody.WasPassed()) {
    nsCOMPtr<nsIInputStream> bodyStream;
    nsCString contentType;
    aRv = ExtractByteStreamFromBody(aBody.Value(), getter_AddRefs(bodyStream), contentType);
    internalResponse->SetBody(bodyStream);

    if (!contentType.IsVoid() &&
        !internalResponse->Headers()->Has(NS_LITERAL_CSTRING("Content-Type"), aRv)) {
      internalResponse->Headers()->Append(NS_LITERAL_CSTRING("Content-Type"), contentType, aRv);
    }

    if (aRv.Failed()) {
      return nullptr;
    }
  }

  r->SetMimeType(aRv);
  return r.forget();
}

/* static */ already_AddRefed<BroadcastChannel>
BroadcastChannel::Constructor(const GlobalObject& aGlobal,
                              const nsAString& aChannel,
                              ErrorResult& aRv)
{
  nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());
  // Window is null in workers.

  nsAutoString origin;
  PrincipalInfo principalInfo;
  bool privateBrowsing = false;
  WorkerPrivate* workerPrivate = nullptr;

  if (NS_IsMainThread()) {
    nsCOMPtr<nsIGlobalObject> incumbent = mozilla::dom::GetIncumbentGlobal();

    if (!incumbent) {
      aRv.Throw(NS_ERROR_FAILURE);
      return nullptr;
    }

    nsIPrincipal* principal = incumbent->PrincipalOrNull();
    if (!principal) {
      aRv.Throw(NS_ERROR_UNEXPECTED);
      return nullptr;
    }

    bool isNullPrincipal;
    aRv = principal->GetIsNullPrincipal(&isNullPrincipal);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }

    if (NS_WARN_IF(isNullPrincipal)) {
      aRv.Throw(NS_ERROR_FAILURE);
      return nullptr;
    }

    GetOrigin(principal, origin, aRv);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }

    aRv = PrincipalToPrincipalInfo(principal, &principalInfo);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }

    nsIDocument* doc = window->GetExtantDoc();
    if (doc) {
      privateBrowsing = nsContentUtils::IsInPrivateBrowsing(doc);

      // No bfcache when BroadcastChannel is used.
      doc->DisallowBFCaching();
    }
  } else {
    JSContext* cx = aGlobal.Context();
    workerPrivate = GetWorkerPrivateFromContext(cx);
    MOZ_ASSERT(workerPrivate);

    nsRefPtr<InitializeRunnable> runnable =
      new InitializeRunnable(workerPrivate, origin, principalInfo,
                             privateBrowsing, aRv);
    runnable->Dispatch(cx);
  }

  if (aRv.Failed()) {
    return nullptr;
  }

  nsRefPtr<BroadcastChannel> bc =
    new BroadcastChannel(window, principalInfo, origin, aChannel,
                         privateBrowsing);

  // Register this component to PBackground.
  PBackgroundChild* actor = BackgroundChild::GetForCurrentThread();
  if (actor) {
    bc->ActorCreated(actor);
  } else {
    BackgroundChild::GetOrCreateForCurrentThread(bc);
  }

  if (!workerPrivate) {
    MOZ_ASSERT(window);
    MOZ_ASSERT(window->IsInnerWindow());
    bc->mInnerID = window->WindowID();

    // Register as observer for inner-window-destroyed.
    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
    if (obs) {
      obs->AddObserver(bc, "inner-window-destroyed", false);
    }
  } else {
    bc->mWorkerFeature = new BroadcastChannelFeature(bc);
    JSContext* cx = workerPrivate->GetJSContext();
    if (NS_WARN_IF(!workerPrivate->AddFeature(cx, bc->mWorkerFeature))) {
      NS_WARNING("Failed to register the BroadcastChannel worker feature.");
      bc->mWorkerFeature = nullptr;
      aRv.Throw(NS_ERROR_FAILURE);
      return nullptr;
//.........这里部分代码省略.........

// Automatically import functions in Module \p DestModule based on the summaries
// index.
//
bool FunctionImporter::importFunctions(
    Module &DestModule, const FunctionImporter::ImportMapTy &ImportList,
    bool ForceImportReferencedDiscardableSymbols) {
  DEBUG(dbgs() << "Starting import for Module "
               << DestModule.getModuleIdentifier() << "\n");
  unsigned ImportedCount = 0;

  // Linker that will be used for importing function
  Linker TheLinker(DestModule);
  // Do the actual import of functions now, one Module at a time
  std::set<StringRef> ModuleNameOrderedList;
  for (auto &FunctionsToImportPerModule : ImportList) {
    ModuleNameOrderedList.insert(FunctionsToImportPerModule.first());
  }
  for (auto &Name : ModuleNameOrderedList) {
    // Get the module for the import
    const auto &FunctionsToImportPerModule = ImportList.find(Name);
    assert(FunctionsToImportPerModule != ImportList.end());
    std::unique_ptr<Module> SrcModule = ModuleLoader(Name);
    assert(&DestModule.getContext() == &SrcModule->getContext() &&
           "Context mismatch");

    // If modules were created with lazy metadata loading, materialize it
    // now, before linking it (otherwise this will be a noop).
    SrcModule->materializeMetadata();
    UpgradeDebugInfo(*SrcModule);

    auto &ImportGUIDs = FunctionsToImportPerModule->second;
    // Find the globals to import
    DenseSet<const GlobalValue *> GlobalsToImport;
    for (Function &F : *SrcModule) {
      if (!F.hasName())
        continue;
      auto GUID = F.getGUID();
      auto Import = ImportGUIDs.count(GUID);
      DEBUG(dbgs() << (Import ? "Is" : "Not") << " importing function " << GUID
                   << " " << F.getName() << " from "
                   << SrcModule->getSourceFileName() << "\n");
      if (Import) {
        F.materialize();
        if (EnableImportMetadata) {
          // Add 'thinlto_src_module' metadata for statistics and debugging.
          F.setMetadata(
              "thinlto_src_module",
              llvm::MDNode::get(
                  DestModule.getContext(),
                  {llvm::MDString::get(DestModule.getContext(),
                                       SrcModule->getSourceFileName())}));
        }
        GlobalsToImport.insert(&F);
      }
    }
    for (GlobalVariable &GV : SrcModule->globals()) {
      if (!GV.hasName())
        continue;
      auto GUID = GV.getGUID();
      auto Import = ImportGUIDs.count(GUID);
      DEBUG(dbgs() << (Import ? "Is" : "Not") << " importing global " << GUID
                   << " " << GV.getName() << " from "
                   << SrcModule->getSourceFileName() << "\n");
      if (Import) {
        GV.materialize();
        GlobalsToImport.insert(&GV);
      }
    }
    for (GlobalAlias &GA : SrcModule->aliases()) {
      if (!GA.hasName())
        continue;
      auto GUID = GA.getGUID();
      auto Import = ImportGUIDs.count(GUID);
      DEBUG(dbgs() << (Import ? "Is" : "Not") << " importing alias " << GUID
                   << " " << GA.getName() << " from "
                   << SrcModule->getSourceFileName() << "\n");
      if (Import) {
        // Alias can't point to "available_externally". However when we import
        // linkOnceODR the linkage does not change. So we import the alias
        // and aliasee only in this case. This has been handled by
        // computeImportForFunction()
        GlobalObject *GO = GA.getBaseObject();
        assert(GO->hasLinkOnceODRLinkage() &&
               "Unexpected alias to a non-linkonceODR in import list");
#ifndef NDEBUG
        if (!GlobalsToImport.count(GO))
          DEBUG(dbgs() << " alias triggers importing aliasee " << GO->getGUID()
                       << " " << GO->getName() << " from "
                       << SrcModule->getSourceFileName() << "\n");
#endif
        GO->materialize();
        GlobalsToImport.insert(GO);
        GA.materialize();
        GlobalsToImport.insert(&GA);
      }
    }

    // Link in the specified functions.
    if (renameModuleForThinLTO(*SrcModule, Index, &GlobalsToImport))
      return true;
//.........这里部分代码省略.........

bool ReduceCrashingFunctions::TestFuncs(std::vector<Function *> &Funcs) {
  // If main isn't present, claim there is no problem.
  if (KeepMain && !is_contained(Funcs, BD.getProgram()->getFunction("main")))
    return false;

  // Clone the program to try hacking it apart...
  ValueToValueMapTy VMap;
  Module *M = CloneModule(BD.getProgram(), VMap).release();

  // Convert list to set for fast lookup...
  std::set<Function *> Functions;
  for (unsigned i = 0, e = Funcs.size(); i != e; ++i) {
    Function *CMF = cast<Function>(VMap[Funcs[i]]);
    assert(CMF && "Function not in module?!");
    assert(CMF->getFunctionType() == Funcs[i]->getFunctionType() && "wrong ty");
    assert(CMF->getName() == Funcs[i]->getName() && "wrong name");
    Functions.insert(CMF);
  }

  outs() << "Checking for crash with only these functions: ";
  PrintFunctionList(Funcs);
  outs() << ": ";
  if (!ReplaceFuncsWithNull) {
    // Loop over and delete any functions which we aren't supposed to be playing
    // with...
    for (Function &I : *M)
      if (!I.isDeclaration() && !Functions.count(&I))
        DeleteFunctionBody(&I);
  } else {
    std::vector<GlobalValue *> ToRemove;
    // First, remove aliases to functions we're about to purge.
    for (GlobalAlias &Alias : M->aliases()) {
      GlobalObject *Root = Alias.getBaseObject();
      Function *F = dyn_cast_or_null<Function>(Root);
      if (F) {
        if (Functions.count(F))
          // We're keeping this function.
          continue;
      } else if (Root->isNullValue()) {
        // This referenced a globalalias that we've already replaced,
        // so we still need to replace this alias.
      } else if (!F) {
        // Not a function, therefore not something we mess with.
        continue;
      }

      PointerType *Ty = cast<PointerType>(Alias.getType());
      Constant *Replacement = ConstantPointerNull::get(Ty);
      Alias.replaceAllUsesWith(Replacement);
      ToRemove.push_back(&Alias);
    }

    for (Function &I : *M) {
      if (!I.isDeclaration() && !Functions.count(&I)) {
        PointerType *Ty = cast<PointerType>(I.getType());
        Constant *Replacement = ConstantPointerNull::get(Ty);
        I.replaceAllUsesWith(Replacement);
        ToRemove.push_back(&I);
      }
    }

    for (auto *F : ToRemove) {
      F->eraseFromParent();
    }

    // Finally, remove any null members from any global intrinsic.
    RemoveFunctionReferences(M, "llvm.used");
    RemoveFunctionReferences(M, "llvm.compiler.used");
  }
  // Try running the hacked up program...
  if (TestFn(BD, M)) {
    BD.setNewProgram(M); // It crashed, keep the trimmed version...

    // Make sure to use function pointers that point into the now-current
    // module.
    Funcs.assign(Functions.begin(), Functions.end());
    return true;
  }
  delete M;
  return false;
}

already_AddRefed<WebSocket>
WebSocket::Constructor(const GlobalObject& aGlobal,
                       const nsAString& aUrl,
                       const Sequence<nsString>& aProtocols,
                       ErrorResult& aRv)
{
  if (!PrefEnabled()) {
    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
    return nullptr;
  }

  nsCOMPtr<nsIScriptObjectPrincipal> scriptPrincipal =
    do_QueryInterface(aGlobal.GetAsSupports());
  if (!scriptPrincipal) {
    aRv.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  nsCOMPtr<nsIPrincipal> principal = scriptPrincipal->GetPrincipal();
  if (!principal) {
    aRv.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  nsCOMPtr<nsIScriptGlobalObject> sgo = do_QueryInterface(aGlobal.GetAsSupports());
  if (!sgo) {
    aRv.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  nsCOMPtr<nsPIDOMWindow> ownerWindow = do_QueryInterface(aGlobal.GetAsSupports());
  if (!ownerWindow) {
    aRv.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  nsTArray<nsString> protocolArray;

  for (uint32_t index = 0, len = aProtocols.Length(); index < len; ++index) {

    const nsString& protocolElement = aProtocols[index];

    if (protocolElement.IsEmpty()) {
      aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
      return nullptr;
    }
    if (protocolArray.Contains(protocolElement)) {
      aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
      return nullptr;
    }
    if (protocolElement.FindChar(',') != -1)  /* interferes w/list */ {
      aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
      return nullptr;
    }

    protocolArray.AppendElement(protocolElement);
  }

  nsRefPtr<WebSocket> webSocket = new WebSocket(ownerWindow);
  nsresult rv = webSocket->Init(aGlobal.Context(), principal,
                                aUrl, protocolArray);
  if (NS_FAILED(rv)) {
    aRv.Throw(rv);
    return nullptr;
  }

  return webSocket.forget();
}

already_AddRefed<HTMLOptionElement>
HTMLOptionElement::Option(const GlobalObject& aGlobal,
                          const Optional<nsAString>& aText,
                          const Optional<nsAString>& aValue,
                          const Optional<bool>& aDefaultSelected,
                          const Optional<bool>& aSelected, ErrorResult& aError)
{
  nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(aGlobal.GetAsSupports());
  nsIDocument* doc;
  if (!win || !(doc = win->GetExtantDoc())) {
    aError.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  nsCOMPtr<nsINodeInfo> nodeInfo =
    doc->NodeInfoManager()->GetNodeInfo(nsGkAtoms::option, nullptr,
                                        kNameSpaceID_XHTML,
                                        nsIDOMNode::ELEMENT_NODE);

  nsRefPtr<HTMLOptionElement> option = new HTMLOptionElement(nodeInfo.forget());

  if (aText.WasPassed()) {
    // Create a new text node and append it to the option
    nsRefPtr<nsTextNode> textContent =
      new nsTextNode(option->NodeInfo()->NodeInfoManager());

    textContent->SetText(aText.Value(), false);

    aError = option->AppendChildTo(textContent, false);
    if (aError.Failed()) {
      return nullptr;
    }

    if (aValue.WasPassed()) {
      // Set the value attribute for this element. We're calling SetAttr
      // directly because we want to pass aNotify == false.
      aError = option->SetAttr(kNameSpaceID_None, nsGkAtoms::value,
                               aValue.Value(), false);
      if (aError.Failed()) {
        return nullptr;
      }

      if (aDefaultSelected.WasPassed()) {
        if (aDefaultSelected.Value()) {
          // We're calling SetAttr directly because we want to pass
          // aNotify == false.
          aError = option->SetAttr(kNameSpaceID_None, nsGkAtoms::selected,
                                   EmptyString(), false);
          if (aError.Failed()) {
            return nullptr;
          }
        }

        if (aSelected.WasPassed()) {
          option->SetSelected(aSelected.Value(), aError);
          if (aError.Failed()) {
            return nullptr;
          }
        }
      }
    }
  }

  return option.forget();
}

/*static*/ already_AddRefed<Response>
Response::Constructor(const GlobalObject& aGlobal,
                      const Optional<ArrayBufferOrArrayBufferViewOrBlobOrFormDataOrUSVStringOrURLSearchParams>& aBody,
                      const ResponseInit& aInit, ErrorResult& aRv)
{
  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());

  if (aInit.mStatus < 200 || aInit.mStatus > 599) {
    aRv.ThrowRangeError(MSG_INVALID_RESPONSE_STATUSCODE_ERROR);
    return nullptr;
  }

  nsCString statusText;
  if (aInit.mStatusText.WasPassed()) {
    statusText = aInit.mStatusText.Value();
    nsACString::const_iterator start, end;
    statusText.BeginReading(start);
    statusText.EndReading(end);
    if (FindCharInReadable('\r', start, end)) {
      aRv.ThrowTypeError(MSG_RESPONSE_INVALID_STATUSTEXT_ERROR);
      return nullptr;
    }
    // Reset iterator since FindCharInReadable advances it.
    statusText.BeginReading(start);
    if (FindCharInReadable('\n', start, end)) {
      aRv.ThrowTypeError(MSG_RESPONSE_INVALID_STATUSTEXT_ERROR);
      return nullptr;
    }
  } else {
    // Since we don't support default values for ByteString.
    statusText = NS_LITERAL_CSTRING("OK");
  }

  nsRefPtr<InternalResponse> internalResponse =
    new InternalResponse(aInit.mStatus, statusText);

  // Grab a valid channel info from the global so this response is 'valid' for
  // interception.
  if (NS_IsMainThread()) {
    nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(global);
    MOZ_ASSERT(window);
    nsIDocument* doc = window->GetExtantDoc();
    MOZ_ASSERT(doc);
    ChannelInfo info;
    info.InitFromDocument(doc);
    internalResponse->InitChannelInfo(info);
  } else {
    workers::WorkerPrivate* worker = workers::GetCurrentThreadWorkerPrivate();
    MOZ_ASSERT(worker);
    internalResponse->InitChannelInfo(worker->GetChannelInfo());
  }

  nsRefPtr<Response> r = new Response(global, internalResponse);

  if (aInit.mHeaders.WasPassed()) {
    internalResponse->Headers()->Clear();

    // Instead of using Fill, create an object to allow the constructor to
    // unwrap the HeadersInit.
    nsRefPtr<Headers> headers =
      Headers::Create(global, aInit.mHeaders.Value(), aRv);
    if (aRv.Failed()) {
      return nullptr;
    }

    internalResponse->Headers()->Fill(*headers->GetInternalHeaders(), aRv);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }
  }

  if (aBody.WasPassed()) {
    nsCOMPtr<nsIInputStream> bodyStream;
    nsCString contentType;
    aRv = ExtractByteStreamFromBody(aBody.Value(), getter_AddRefs(bodyStream), contentType);
    internalResponse->SetBody(bodyStream);

    if (!contentType.IsVoid() &&
        !internalResponse->Headers()->Has(NS_LITERAL_CSTRING("Content-Type"), aRv)) {
      internalResponse->Headers()->Append(NS_LITERAL_CSTRING("Content-Type"), contentType, aRv);
    }

    if (aRv.Failed()) {
      return nullptr;
    }
  }

  r->SetMimeType();
  return r.forget();
}

already_AddRefed<DOMMatrix>
DOMMatrix::Constructor(const GlobalObject& aGlobal, const DOMMatrixReadOnly& aOther, ErrorResult& aRv)
{
  RefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports(), aOther);
  return obj.forget();
}

/* static */ already_AddRefed<BroadcastChannel>
BroadcastChannel::Constructor(const GlobalObject& aGlobal,
                              const nsAString& aChannel,
                              ErrorResult& aRv)
{
  nsCOMPtr<nsPIDOMWindowInner> window =
    do_QueryInterface(aGlobal.GetAsSupports());
  // Window is null in workers.

  nsAutoCString origin;
  PrincipalInfo principalInfo;
  WorkerPrivate* workerPrivate = nullptr;

  if (NS_IsMainThread()) {
    nsCOMPtr<nsIGlobalObject> incumbent = mozilla::dom::GetIncumbentGlobal();

    if (!incumbent) {
      aRv.Throw(NS_ERROR_FAILURE);
      return nullptr;
    }

    nsIPrincipal* principal = incumbent->PrincipalOrNull();
    if (!principal) {
      aRv.Throw(NS_ERROR_UNEXPECTED);
      return nullptr;
    }

    aRv = principal->GetOrigin(origin);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }

    aRv = PrincipalToPrincipalInfo(principal, &principalInfo);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }
  } else {
    JSContext* cx = aGlobal.Context();
    workerPrivate = GetWorkerPrivateFromContext(cx);
    MOZ_ASSERT(workerPrivate);

    RefPtr<InitializeRunnable> runnable =
      new InitializeRunnable(workerPrivate, origin, principalInfo, aRv);
    runnable->Dispatch(Closing, aRv);
  }

  if (aRv.Failed()) {
    return nullptr;
  }

  RefPtr<BroadcastChannel> bc =
    new BroadcastChannel(window, principalInfo, origin, aChannel);

  // Register this component to PBackground.
  PBackgroundChild* actor = BackgroundChild::GetForCurrentThread();
  if (actor) {
    bc->ActorCreated(actor);
  } else {
    BackgroundChild::GetOrCreateForCurrentThread(bc);
  }

  if (!workerPrivate) {
    MOZ_ASSERT(window);
    MOZ_ASSERT(window->IsInnerWindow());
    bc->mInnerID = window->WindowID();

    // Register as observer for inner-window-destroyed.
    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
    if (obs) {
      obs->AddObserver(bc, "inner-window-destroyed", false);
    }
  } else {
    bc->mWorkerHolder = new BroadcastChannelWorkerHolder(bc);
    if (NS_WARN_IF(!bc->mWorkerHolder->HoldWorker(workerPrivate, Closing))) {
      bc->mWorkerHolder = nullptr;
      aRv.Throw(NS_ERROR_FAILURE);
      return nullptr;
    }
  }

  return bc.forget();
}

    BOOL ModuleRoot::SetRootProperty(PropertyId propertyId, Var value, PropertyOperationFlags flags, PropertyValueInfo* info)
    {
        PropertyIndex index = GetRootPropertyIndex(propertyId);
        if (index != Constants::NoSlot)
        {
            if (this->IsWritable(propertyId) == FALSE)
            {
                JavascriptError::ThrowCantAssignIfStrictMode(flags, this->GetScriptContext());

#if ENABLE_FIXED_FIELDS
                if (this->IsFixedProperty(propertyId))
                {
                    PropertyValueInfo::SetNoCache(info, this);
                }
                else
#endif
                {
                    PropertyValueInfo::Set(info, this, index, PropertyNone); // Try to cache property info even if not writable
                }
                return FALSE;
            }
            this->SetSlot(SetSlotArgumentsRoot(propertyId, true, index, value));
#if ENABLE_FIXED_FIELDS
            if (this->IsFixedProperty(propertyId))
            {
                PropertyValueInfo::SetNoCache(info, this);
            }
            else
#endif
            {
                PropertyValueInfo::Set(info, this, index);
            }            
            return TRUE;
        }
        else if (this->hostObject && this->hostObject->HasProperty(propertyId))
        {
            return this->hostObject->SetProperty(propertyId, value, flags, NULL);
        }

        //
        // Try checking the global object
        // if the module root doesn't have the property and the host object also doesn't have it
        //
        GlobalObject* globalObj = this->GetLibrary()->GetGlobalObject();
        BOOL setAttempted = TRUE;
        if (globalObj->SetExistingRootProperty(propertyId, value, NULL, &setAttempted))
        {
            return TRUE;
        }

        //
        // Set was attempted. But the set operation returned false.
        // This happens, when the property is read only.
        // In those scenarios, we should be setting the property with default attributes
        //
        if (setAttempted)
        {
            return FALSE;
        }

        return __super::SetRootProperty(propertyId, value, (PropertyOperationFlags)(flags | PropertyOperation_NonFixedValue), info);
    }

 static GlobalObject* create(JSGlobalData& globalData, Structure* structure, const Vector<UString>& arguments)
 {
     GlobalObject* object = new (allocateCell<GlobalObject>(globalData.heap)) GlobalObject(globalData, structure);
     object->finishCreation(globalData, arguments);
     return object;
 }

already_AddRefed<DOMMatrix>
DOMMatrix::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
{
  nsRefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports());
  return obj.forget();
}

/* static */ already_AddRefed<VRSubmitFrameResult>
VRSubmitFrameResult::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
{
  RefPtr<VRSubmitFrameResult> obj = new VRSubmitFrameResult(aGlobal.GetAsSupports());
  return obj.forget();
}