1 files changed, 122 insertions, 0 deletions
diff --git a/dom/script/ModuleLoadRequest.h b/dom/script/ModuleLoadRequest.h
new file mode 100644
index 0000000000..8faff57cac
--- /dev/null
+++ b/dom/script/ModuleLoadRequest.h
@@ -0,0 +1,122 @@
+/* -*- 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_dom_ModuleLoadRequest_h
+#define mozilla_dom_ModuleLoadRequest_h
+
+#include "ScriptLoadRequest.h"
+#include "js/RootingAPI.h"
+#include "js/Value.h"
+#include "nsURIHashKey.h"
+#include "mozilla/MozPromise.h"
+#include "nsTHashtable.h"
+
+namespace mozilla {
+namespace dom {
+
+class ModuleScript;
+class ScriptLoader;
+
+// A reference counted set of URLs we have visited in the process of loading a
+// module graph.
+class VisitedURLSet : public nsTHashtable<nsURIHashKey> {
+  NS_INLINE_DECL_REFCOUNTING(VisitedURLSet)
+
+ private:
+  ~VisitedURLSet() = default;
+};
+
+// A load request for a module, created for every top level module script and
+// every module import.  Load request can share an ModuleScript if there are
+// multiple imports of the same module.
+
+class ModuleLoadRequest final : public ScriptLoadRequest {
+  ~ModuleLoadRequest() = default;
+
+  ModuleLoadRequest(const ModuleLoadRequest& aOther) = delete;
+  ModuleLoadRequest(ModuleLoadRequest&& aOther) = delete;
+
+  ModuleLoadRequest(nsIURI* aURI, ScriptFetchOptions* aFetchOptions,
+                    const SRIMetadata& aIntegrity, nsIURI* aReferrer,
+                    bool aIsTopLevel, bool aIsDynamicImport,
+                    ScriptLoader* aLoader, VisitedURLSet* aVisitedSet);
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(ModuleLoadRequest,
+                                                         ScriptLoadRequest)
+
+  // Create a top-level module load request.
+  static ModuleLoadRequest* CreateTopLevel(nsIURI* aURI,
+                                           ScriptFetchOptions* aFetchOptions,
+                                           const SRIMetadata& aIntegrity,
+                                           nsIURI* aReferrer,
+                                           ScriptLoader* aLoader);
+
+  // Create a module load request for a static module import.
+  static ModuleLoadRequest* CreateStaticImport(nsIURI* aURI,
+                                               ModuleLoadRequest* aParent);
+
+  // Create a module load request for dynamic module import.
+  static ModuleLoadRequest* CreateDynamicImport(
+      nsIURI* aURI, ScriptFetchOptions* aFetchOptions, nsIURI* aBaseURL,
+      ScriptLoader* aLoader, JS::Handle<JS::Value> aReferencingPrivate,
+      JS::Handle<JSString*> aSpecifier, JS::Handle<JSObject*> aPromise);
+
+  bool IsTopLevel() const override { return mIsTopLevel; }
+
+  bool IsDynamicImport() const { return mIsDynamicImport; }
+
+  void SetReady() override;
+  void Cancel() override;
+  void ClearDynamicImport();
+
+  void ModuleLoaded();
+  void ModuleErrored();
+  void DependenciesLoaded();
+  void LoadFailed();
+
+ private:
+  void LoadFinished();
+  void CancelImports();
+
+ public:
+  // Is this a request for a top level module script or an import?
+  const bool mIsTopLevel;
+
+  // Is this the top level request for a dynamic module import?
+  const bool mIsDynamicImport;
+
+  // Pointer to the script loader, used to trigger actions when the module load
+  // finishes.
+  RefPtr<ScriptLoader> mLoader;
+
+  // Set to a module script object after a successful load or nullptr on
+  // failure.
+  RefPtr<ModuleScript> mModuleScript;
+
+  // A promise that is completed on successful load of this module and all of
+  // its dependencies, indicating that the module is ready for instantiation and
+  // evaluation.
+  MozPromiseHolder<GenericPromise> mReady;
+
+  // Array of imported modules.
+  nsTArray<RefPtr<ModuleLoadRequest>> mImports;
+
+  // Set of module URLs visited while fetching the module graph this request is
+  // part of.
+  RefPtr<VisitedURLSet> mVisitedSet;
+
+  // For dynamic imports, the details to pass to FinishDynamicImport.
+  JS::Heap<JS::Value> mDynamicReferencingPrivate;
+  JS::Heap<JSString*> mDynamicSpecifier;
+  JS::Heap<JSObject*> mDynamicPromise;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_ModuleLoadRequest_h