1 files changed, 119 insertions, 0 deletions
diff --git a/js/xpconnect/loader/ComponentModuleLoader.h b/js/xpconnect/loader/ComponentModuleLoader.h
new file mode 100644
index 0000000000..7dd39dd342
--- /dev/null
+++ b/js/xpconnect/loader/ComponentModuleLoader.h
@@ -0,0 +1,119 @@
+/* -*- 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_ComponentModuleLoader_h
+#define mozilla_loader_ComponentModuleLoader_h
+
+#include "js/loader/LoadContextBase.h"
+#include "js/loader/ModuleLoaderBase.h"
+
+#include "SkipCheckForBrokenURLOrZeroSized.h"
+
+class mozJSModuleLoader;
+
+namespace mozilla {
+namespace loader {
+
+class ComponentScriptLoader : public JS::loader::ScriptLoaderInterface {
+ public:
+  NS_DECL_ISUPPORTS
+
+ private:
+  ~ComponentScriptLoader() = default;
+
+  nsIURI* GetBaseURI() const override;
+
+  void ReportErrorToConsole(ScriptLoadRequest* aRequest,
+                            nsresult aResult) const override;
+
+  void ReportWarningToConsole(ScriptLoadRequest* aRequest,
+                              const char* aMessageName,
+                              const nsTArray<nsString>& aParams) const override;
+
+  nsresult FillCompileOptionsForRequest(
+      JSContext* cx, ScriptLoadRequest* aRequest, JS::CompileOptions* aOptions,
+      JS::MutableHandle<JSScript*> aIntroductionScript) override;
+};
+
+class ComponentModuleLoader : public JS::loader::ModuleLoaderBase {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ComponentModuleLoader,
+                                           JS::loader::ModuleLoaderBase)
+
+  ComponentModuleLoader(ComponentScriptLoader* aScriptLoader,
+                        nsIGlobalObject* aGlobalObject);
+
+  [[nodiscard]] nsresult ProcessRequests();
+
+  void MaybeReportLoadError(JSContext* aCx);
+
+ private:
+  // An event target that dispatches runnables by executing them
+  // immediately. This is used to drive mozPromise dispatch for
+  // ComponentModuleLoader.
+  class SyncEventTarget : public nsISerialEventTarget {
+   public:
+    NS_DECL_THREADSAFE_ISUPPORTS
+    NS_DECL_NSIEVENTTARGET_FULL
+   private:
+    virtual ~SyncEventTarget() = default;
+  };
+
+  ~ComponentModuleLoader();
+
+  already_AddRefed<ModuleLoadRequest> CreateStaticImport(
+      nsIURI* aURI, ModuleLoadRequest* aParent) override;
+
+  already_AddRefed<ModuleLoadRequest> CreateDynamicImport(
+      JSContext* aCx, nsIURI* aURI, LoadedScript* aMaybeActiveScript,
+      JS::Handle<JS::Value> aReferencingPrivate,
+      JS::Handle<JSString*> aSpecifier,
+      JS::Handle<JSObject*> aPromise) override;
+
+  bool CanStartLoad(ModuleLoadRequest* aRequest, nsresult* aRvOut) override;
+
+  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;
+
+  JS::loader::ScriptLoadRequestList mLoadRequests;
+
+  // If any of module scripts failed to load, exception is set here until it's
+  // reported by MaybeReportLoadError.
+  JS::PersistentRooted<JS::Value> mLoadException;
+};
+
+// Data specific to ComponentModuleLoader that is associated with each load
+// request.
+class ComponentLoadContext : public JS::loader::LoadContextBase {
+ public:
+  ComponentLoadContext()
+      : LoadContextBase(JS::loader::ContextKind::Component) {}
+
+ public:
+  // The result of compiling a module script. These fields are used temporarily
+  // before being passed to the module loader.
+  nsresult mRv;
+
+  SkipCheckForBrokenURLOrZeroSized mSkipCheck;
+
+  // The exception thrown during compiling a module script. These fields are
+  // used temporarily before being passed to the module loader.
+  JS::PersistentRooted<JS::Value> mExceptionValue;
+
+  JS::PersistentRooted<JSScript*> mScript;
+};
+
+}  // namespace loader
+}  // namespace mozilla
+
+#endif  // mozilla_loader_ComponentModuleLoader_h