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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_dom_ScriptLoadContext_h
+#define mozilla_dom_ScriptLoadContext_h
+
+#include "js/AllocPolicy.h"
+#include "js/RootingAPI.h"
+#include "js/SourceText.h"
+#include "js/TypeDecls.h"
+#include "js/loader/LoadContextBase.h"
+#include "js/loader/ScriptKind.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/CORSMode.h"
+#include "mozilla/dom/SRIMetadata.h"
+#include "mozilla/LinkedList.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/MaybeOneOf.h"
+#include "mozilla/PreloaderBase.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/Utf8.h" // mozilla::Utf8Unit
+#include "mozilla/Variant.h"
+#include "mozilla/Vector.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIScriptElement.h"
+
+class nsICacheInfoChannel;
+
+namespace JS {
+class OffThreadToken;
+} // namespace JS
+
+namespace mozilla::dom {
+
+class Element;
+
+/*
+ * DOM specific ScriptLoadContext.
+ *
+ * ScriptLoadContexts augment the loading of a ScriptLoadRequest. They
+ * describe how a ScriptLoadRequests loading and evaluation needs to be
+ * augmented, based on the information provided by the loading context. In
+ * the case of the DOM, the ScriptLoadContext is used to identify how a script
+ * should be loaded according to information found in the HTML document into
+ * which it will be loaded. The following fields describe how the
+ * ScriptLoadRequest will be loaded.
+ *
+ * * mScriptMode
+ * stores the mode (Async, Sync, Deferred), and preload, which
+ * allows the ScriptLoader to decide if the script should be pushed
+ * offThread, or if the preloaded request should be used.
+ * * mScriptFromHead
+ * Set when the script tag is in the head, and should be treated as
+ * a blocking script
+ * * mIsInline
+ * Set for scripts whose bodies are inline in the html. In this case,
+ * the script does not need to be fetched first.
+ * * mIsXSLT
+ * Set if we are in an XSLT request.
+ * * mIsPreload
+ * Set for scripts that are preloaded in a
+ * <link rel="preload" as="script"> or <link rel="modulepreload">
+ * element.
+ *
+ * In addition to describing how the ScriptLoadRequest will be loaded by the
+ * DOM ScriptLoader, the ScriptLoadContext contains fields that facilitate
+ * those custom behaviors, including support for offthread parsing, pointers
+ * to runnables (for cancellation and cleanup if a script is parsed offthread)
+ * and preload element specific controls.
+ *
+ */
+
+class ScriptLoadContext : public JS::loader::LoadContextBase,
+ public PreloaderBase {
+ protected:
+ virtual ~ScriptLoadContext();
+
+ public:
+ explicit ScriptLoadContext();
+
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ScriptLoadContext,
+ JS::loader::LoadContextBase)
+
+ // PreloaderBase
+ static void PrioritizeAsPreload(nsIChannel* aChannel);
+ virtual void PrioritizeAsPreload() override;
+
+ bool IsPreload() const;
+
+ bool CompileStarted() const;
+
+ JS::OffThreadToken** OffThreadTokenPtr() {
+ return mOffThreadToken ? &mOffThreadToken : nullptr;
+ }
+
+ bool IsTracking() const { return mIsTracking; }
+ void SetIsTracking() {
+ MOZ_ASSERT(!mIsTracking);
+ mIsTracking = true;
+ }
+
+ void BlockOnload(Document* aDocument);
+
+ void MaybeUnblockOnload();
+
+ enum class ScriptMode : uint8_t {
+ eBlocking,
+ eDeferred,
+ eAsync,
+ eLinkPreload // this is a load initiated by <link rel="preload"
+ // as="script"> or <link rel="modulepreload"> tag
+ };
+
+ void SetScriptMode(bool aDeferAttr, bool aAsyncAttr, bool aLinkPreload);
+
+ bool IsLinkPreloadScript() const {
+ return mScriptMode == ScriptMode::eLinkPreload;
+ }
+
+ bool IsBlockingScript() const { return mScriptMode == ScriptMode::eBlocking; }
+
+ bool IsDeferredScript() const { return mScriptMode == ScriptMode::eDeferred; }
+
+ bool IsAsyncScript() const { return mScriptMode == ScriptMode::eAsync; }
+
+ nsIScriptElement* GetScriptElement() const;
+
+ // Make this request a preload (speculative) request.
+ void SetIsPreloadRequest() {
+ MOZ_ASSERT(!GetScriptElement());
+ MOZ_ASSERT(!IsPreload());
+ mIsPreload = true;
+ }
+
+ // Make a preload request into an actual load request for the given element.
+ void SetIsLoadRequest(nsIScriptElement* aElement);
+
+ FromParser GetParserCreated() const {
+ nsIScriptElement* element = GetScriptElement();
+ if (!element) {
+ return NOT_FROM_PARSER;
+ }
+ return element->GetParserCreated();
+ }
+
+ // Used to output a string for the Gecko Profiler.
+ void GetProfilerLabel(nsACString& aOutString) override;
+
+ void MaybeCancelOffThreadScript();
+
+ ScriptMode mScriptMode; // Whether this is a blocking, defer or async script.
+ bool mScriptFromHead; // Synchronous head script block loading of other non
+ // js/css content.
+ bool mIsInline; // Is the script inline or loaded?
+ bool mInDeferList; // True if we live in mDeferRequests.
+ bool mInAsyncList; // True if we live in mLoadingAsyncRequests or
+ // mLoadedAsyncRequests.
+ bool mIsNonAsyncScriptInserted; // True if we live in
+ // mNonAsyncExternalScriptInsertedRequests
+ bool mIsXSLT; // True if we live in mXSLTRequests.
+ bool mInCompilingList; // True if we are in mOffThreadCompilingRequests.
+ bool mIsTracking; // True if the script comes from a source on our
+ // tracking protection list.
+ bool mWasCompiledOMT; // True if the script has been compiled off main
+ // thread.
+
+ // Off-thread parsing token. Set at the start of off-thread parsing and
+ // cleared when the result of the parse is used.
+ JS::OffThreadToken* mOffThreadToken;
+
+ // Runnable that is dispatched to the main thread when off-thread compilation
+ // completes.
+ RefPtr<Runnable> mRunnable;
+
+ uint32_t mLineNo;
+ uint32_t mColumnNo;
+
+ // Set on scripts and top level modules.
+ bool mIsPreload;
+
+ // Non-null if there is a document that this request is blocking from loading.
+ RefPtr<Document> mLoadBlockedDocument;
+
+ // For preload requests, we defer reporting errors to the console until the
+ // request is used.
+ nsresult mUnreportedPreloadError;
+};
+
+} // namespace mozilla::dom
+
+#endif // mozilla_dom_ScriptLoadContext_h