WorkerModuleLoader.h

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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/. */

#ifndef mozilla_loader_WorkerModuleLoader_h

#define mozilla_loader_WorkerModuleLoader_h

#include "js/loader/ModuleLoaderBase.h"

#include "js/loader/ScriptFetchOptions.h"

#include "mozilla/dom/SerializedStackHolder.h"

#include "mozilla/UniquePtr.h"

namespace mozilla::dom::workerinternals::loader {

class WorkerScriptLoader;

// alias common classes

using ScriptFetchOptions = JS::loader::ScriptFetchOptions;

using ScriptKind = JS::loader::ScriptKind;

using ScriptLoadRequest = JS::loader::ScriptLoadRequest;

using ScriptLoadRequestList = JS::loader::ScriptLoadRequestList;

using ModuleLoadRequest = JS::loader::ModuleLoadRequest;

// WorkerModuleLoader

//

// The WorkerModuleLoader provides the methods that implement specification

// step 5 from "To fetch a worklet/module worker script graph", specifically for

// workers. In addition, this implements worker specific initialization for

// Static imports and Dynamic imports.

//

// The steps are outlined in "To fetch the descendants of and link a module

// script" and are common for all Modules. Thus we delegate to ModuleLoaderBase

// for those steps.

class WorkerModuleLoader : public JS::loader::ModuleLoaderBase {

 public:

  NS_DECL_ISUPPORTS_INHERITED

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(WorkerModuleLoader,

                                           JS::loader::ModuleLoaderBase)

  WorkerModuleLoader(WorkerScriptLoader* aScriptLoader,

                     nsIGlobalObject* aGlobalObject);

 private:

  ~WorkerModuleLoader() = default;

  bool CreateDynamicImportLoader();

  void SetScriptLoader(JS::loader::ScriptLoaderInterface* aLoader) {

    mLoader = aLoader;

  WorkerScriptLoader* GetCurrentScriptLoader();

  WorkerScriptLoader* GetScriptLoaderFor(ModuleLoadRequest* aRequest);

  nsIURI* GetBaseURI() const override;

  already_AddRefed<ModuleLoadRequest> CreateStaticImport(

      nsIURI* aURI, ModuleLoadRequest* aParent) override;

  already_AddRefed<ModuleLoadRequest> CreateDynamicImport(

      JSContext* aCx, nsIURI* aURI, LoadedScript* aMaybeActiveScript,

      JS::Handle<JSString*> aSpecifier,

      JS::Handle<JSObject*> aPromise) override;

  bool IsDynamicImportSupported() override;

  bool CanStartLoad(ModuleLoadRequest* aRequest, nsresult* aRvOut) override;

  // StartFetch is special for worker modules, as we need to move back to the

  // main thread to start a new load.

  nsresult StartFetch(ModuleLoadRequest* aRequest) override;

  nsresult CompileFetchedModule(

      JSContext* aCx, JS::Handle<JSObject*> aGlobal,

      JS::CompileOptions& aOptions, ModuleLoadRequest* aRequest,

      JS::MutableHandle<JSObject*> aModuleScript) override;

  void OnModuleLoadComplete(ModuleLoadRequest* aRequest) override;

  bool IsModuleEvaluationAborted(ModuleLoadRequest* aRequest) override;

};

}  // namespace mozilla::dom::workerinternals::loader

#endif  // mozilla_loader_WorkerModuleLoader_h