Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 780 insertions, 0 deletions

diff --git a/dom/script/ScriptLoader.h b/dom/script/ScriptLoader.h
new file mode 100644
index 0000000000..4228f7c758
--- /dev/null
+++ b/dom/script/ScriptLoader.h
@@ -0,0 +1,780 @@
+/* -*- 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_ScriptLoader_h
+#define mozilla_dom_ScriptLoader_h
+
+#include "js/TypeDecls.h"
+#include "nsCOMPtr.h"
+#include "nsRefPtrHashtable.h"
+#include "nsIScriptElement.h"
+#include "nsCOMArray.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsTArray.h"
+#include "nsINode.h"
+#include "nsIObserver.h"
+#include "nsIScriptLoaderObserver.h"
+#include "nsURIHashKey.h"
+#include "mozilla/CORSMode.h"
+#include "mozilla/dom/LoadedScript.h"
+#include "mozilla/dom/ScriptLoadRequest.h"
+#include "mozilla/MaybeOneOf.h"
+#include "mozilla/MozPromise.h"
+#include "ScriptKind.h"
+
+class nsCycleCollectionTraversalCallback;
+class nsIChannel;
+class nsIConsoleReportCollector;
+class nsIContent;
+class nsIIncrementalStreamLoader;
+class nsIPrincipal;
+class nsIScriptGlobalObject;
+class nsIURI;
+
+namespace JS {
+
+class CompileOptions;
+
+template <typename UnitT>
+class SourceText;
+
+}  // namespace JS
+
+namespace mozilla {
+
+class LazyLogModule;
+union Utf8Unit;
+
+namespace dom {
+
+class AutoJSAPI;
+class DocGroup;
+class Document;
+class LoadedScript;
+class ModuleLoadRequest;
+class ModuleScript;
+class SRICheckDataVerifier;
+class SRIMetadata;
+class ScriptLoadHandler;
+class ScriptLoader;
+class ScriptRequestProcessor;
+
+enum class ReferrerPolicy : uint8_t;
+
+class AsyncCompileShutdownObserver final : public nsIObserver {
+  ~AsyncCompileShutdownObserver() { Unregister(); }
+
+ public:
+  explicit AsyncCompileShutdownObserver(ScriptLoader* aLoader)
+      : mScriptLoader(aLoader) {}
+
+  void OnShutdown();
+  void Unregister();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+ private:
+  // Defined during registration in ScriptLoader constructor, and
+  // cleared during destructor, ScriptLoader::Destroy() or Shutdown.
+  ScriptLoader* mScriptLoader;
+};
+
+//////////////////////////////////////////////////////////////
+// Script loader implementation
+//////////////////////////////////////////////////////////////
+
+class ScriptLoader final : public nsISupports {
+  class MOZ_STACK_CLASS AutoCurrentScriptUpdater {
+   public:
+    AutoCurrentScriptUpdater(ScriptLoader* aScriptLoader,
+                             nsIScriptElement* aCurrentScript)
+        : mOldScript(aScriptLoader->mCurrentScript),
+          mScriptLoader(aScriptLoader) {
+      nsCOMPtr<nsINode> node = do_QueryInterface(aCurrentScript);
+      mScriptLoader->mCurrentScript =
+          node && !node->IsInShadowTree() ? aCurrentScript : nullptr;
+    }
+
+    ~AutoCurrentScriptUpdater() {
+      mScriptLoader->mCurrentScript.swap(mOldScript);
+    }
+
+   private:
+    nsCOMPtr<nsIScriptElement> mOldScript;
+    ScriptLoader* mScriptLoader;
+  };
+
+  friend class ModuleLoadRequest;
+  friend class ScriptRequestProcessor;
+  friend class ScriptLoadHandler;
+  friend class AutoCurrentScriptUpdater;
+
+ public:
+  explicit ScriptLoader(Document* aDocument);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(ScriptLoader)
+
+  /**
+   * The loader maintains a weak reference to the document with
+   * which it is initialized. This call forces the reference to
+   * be dropped.
+   */
+  void DropDocumentReference() { mDocument = nullptr; }
+
+  /**
+   * Add an observer for all scripts loaded through this loader.
+   *
+   * @param aObserver observer for all script processing.
+   */
+  nsresult AddObserver(nsIScriptLoaderObserver* aObserver) {
+    return mObservers.AppendObject(aObserver) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  /**
+   * Remove an observer.
+   *
+   * @param aObserver observer to be removed
+   */
+  void RemoveObserver(nsIScriptLoaderObserver* aObserver) {
+    mObservers.RemoveObject(aObserver);
+  }
+
+  /**
+   * Process a script element. This will include both loading the
+   * source of the element if it is not inline and evaluating
+   * the script itself.
+   *
+   * If the script is an inline script that can be executed immediately
+   * (i.e. there are no other scripts pending) then ScriptAvailable
+   * and ScriptEvaluated will be called before the function returns.
+   *
+   * If true is returned the script could not be executed immediately.
+   * In this case ScriptAvailable is guaranteed to be called at a later
+   * point (as well as possibly ScriptEvaluated).
+   *
+   * @param aElement The element representing the script to be loaded and
+   *        evaluated.
+   */
+  bool ProcessScriptElement(nsIScriptElement* aElement);
+
+  /**
+   * Gets the currently executing script. This is useful if you want to
+   * generate a unique key based on the currently executing script.
+   */
+  nsIScriptElement* GetCurrentScript() { return mCurrentScript; }
+
+  nsIScriptElement* GetCurrentParserInsertedScript() {
+    return mCurrentParserInsertedScript;
+  }
+
+  /**
+   * Whether the loader is enabled or not.
+   * When disabled, processing of new script elements is disabled.
+   * Any call to ProcessScriptElement() will return false. Note that
+   * this DOES NOT disable currently loading or executing scripts.
+   */
+  bool GetEnabled() { return mEnabled; }
+
+  void SetEnabled(bool aEnabled) {
+    if (!mEnabled && aEnabled) {
+      ProcessPendingRequestsAsync();
+    }
+    mEnabled = aEnabled;
+  }
+
+  /**
+   *  Check whether to speculatively OMT parse scripts as soon as
+   *  they are fetched, even if not a parser blocking request.
+   *  Controlled by
+   *  dom.script_loader.external_scripts.speculative_omt_parse_enabled
+   */
+  bool SpeculativeOMTParsingEnabled() const {
+    return mSpeculativeOMTParsingEnabled;
+  }
+
+  /**
+   * Add/remove a blocker for parser-blocking scripts (and XSLT
+   * scripts). Blockers will stop such scripts from executing, but not from
+   * loading.
+   */
+  void AddParserBlockingScriptExecutionBlocker() {
+    ++mParserBlockingBlockerCount;
+  }
+
+  void RemoveParserBlockingScriptExecutionBlocker() {
+    if (!--mParserBlockingBlockerCount && ReadyToExecuteScripts()) {
+      ProcessPendingRequestsAsync();
+    }
+  }
+
+  /**
+   * Add/remove a blocker for execution of all scripts.  Blockers will stop
+   * scripts from executing, but not from loading.
+   */
+  void AddExecuteBlocker() { ++mBlockerCount; }
+
+  void RemoveExecuteBlocker() {
+    MOZ_ASSERT(mBlockerCount);
+    if (!--mBlockerCount) {
+      ProcessPendingRequestsAsync();
+    }
+  }
+
+  /**
+   * Convert the given buffer to a UTF-16 string.  If the buffer begins with a
+   * BOM, it is interpreted as that encoding; otherwise the first of |aChannel|,
+   * |aHintCharset|, or |aDocument| that provides a recognized encoding is used,
+   * or Windows-1252 if none of them do.
+   *
+   * Encoding errors in the buffer are converted to replacement characters, so
+   * allocation failure is the only way this function can fail.
+   *
+   * @param aChannel     Channel corresponding to the data. May be null.
+   * @param aData        The data to convert
+   * @param aLength      Length of the data
+   * @param aHintCharset Character set hint (e.g., from a charset attribute).
+   * @param aDocument    Document which the data is loaded for. May be null.
+   * @param aBufOut      [out] fresh char16_t array containing data converted to
+   *                     Unicode.  Caller must js_free() this data when finished
+   *                     with it.
+   * @param aLengthOut   [out] Length of array returned in aBufOut in number
+   *                     of char16_t code units.
+   */
+  static nsresult ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData,
+                                 uint32_t aLength,
+                                 const nsAString& aHintCharset,
+                                 Document* aDocument, char16_t*& aBufOut,
+                                 size_t& aLengthOut);
+
+  static inline nsresult ConvertToUTF16(nsIChannel* aChannel,
+                                        const uint8_t* aData, uint32_t aLength,
+                                        const nsAString& aHintCharset,
+                                        Document* aDocument,
+                                        JS::UniqueTwoByteChars& aBufOut,
+                                        size_t& aLengthOut) {
+    char16_t* bufOut;
+    nsresult rv = ConvertToUTF16(aChannel, aData, aLength, aHintCharset,
+                                 aDocument, bufOut, aLengthOut);
+    if (NS_SUCCEEDED(rv)) {
+      aBufOut.reset(bufOut);
+    }
+    return rv;
+  };
+
+  /**
+   * Convert the given buffer to a UTF-8 string.  If the buffer begins with a
+   * BOM, it is interpreted as that encoding; otherwise the first of |aChannel|,
+   * |aHintCharset|, or |aDocument| that provides a recognized encoding is used,
+   * or Windows-1252 if none of them do.
+   *
+   * Encoding errors in the buffer are converted to replacement characters, so
+   * allocation failure is the only way this function can fail.
+   *
+   * @param aChannel     Channel corresponding to the data. May be null.
+   * @param aData        The data to convert
+   * @param aLength      Length of the data
+   * @param aHintCharset Character set hint (e.g., from a charset attribute).
+   * @param aDocument    Document which the data is loaded for. May be null.
+   * @param aBufOut      [out] fresh Utf8Unit array containing data converted to
+   *                     Unicode.  Caller must js_free() this data when finished
+   *                     with it.
+   * @param aLengthOut   [out] Length of array returned in aBufOut in UTF-8 code
+   *                     units (i.e. in bytes).
+   */
+  static nsresult ConvertToUTF8(nsIChannel* aChannel, const uint8_t* aData,
+                                uint32_t aLength, const nsAString& aHintCharset,
+                                Document* aDocument, Utf8Unit*& aBufOut,
+                                size_t& aLengthOut);
+
+  /**
+   * Handle the completion of a stream.  This is called by the
+   * ScriptLoadHandler object which observes the IncrementalStreamLoader
+   * loading the script. The streamed content is expected to be stored on the
+   * aRequest argument.
+   */
+  nsresult OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
+                            ScriptLoadRequest* aRequest,
+                            nsresult aChannelStatus, nsresult aSRIStatus,
+                            SRICheckDataVerifier* aSRIDataVerifier);
+
+  /**
+   * Returns wether any request is queued, and not executed yet.
+   */
+  bool HasPendingRequests();
+
+  /**
+   * Processes any pending requests that are ready for processing.
+   */
+  void ProcessPendingRequests();
+
+  /**
+   * Starts deferring deferred scripts and puts them in the mDeferredRequests
+   * queue instead.
+   */
+  void BeginDeferringScripts();
+
+  /**
+   * Notifies the script loader that parsing is done.  If aTerminated is true,
+   * this will drop any pending scripts that haven't run yet, otherwise it will
+   * do nothing.
+   */
+  void ParsingComplete(bool aTerminated);
+
+  /**
+   * Notifies the script loader that the checkpoint to begin execution of defer
+   * scripts has been reached. This is either the end of of the document parse
+   * or the end of loading of parser-inserted stylesheets, whatever happens
+   * last.
+   *
+   * Otherwise, it will stop deferring scripts and immediately processes the
+   * mDeferredRequests queue.
+   *
+   * WARNING: This function will synchronously execute content scripts, so be
+   * prepared that the world might change around you.
+   */
+  void DeferCheckpointReached();
+
+  /**
+   * Returns the number of pending scripts, deferred or not.
+   */
+  uint32_t HasPendingOrCurrentScripts() {
+    return mCurrentScript || mParserBlockingRequest;
+  }
+
+  /**
+   * Adds aURI to the preload list and starts loading it.
+   *
+   * @param aURI The URI of the external script.
+   * @param aCharset The charset parameter for the script.
+   * @param aType The type parameter for the script.
+   * @param aCrossOrigin The crossorigin attribute for the script.
+   *                     Void if not present.
+   * @param aIntegrity The expect hash url, if avail, of the request
+   * @param aScriptFromHead Whether or not the script was a child of head
+   */
+  virtual void PreloadURI(nsIURI* aURI, const nsAString& aCharset,
+                          const nsAString& aType, const nsAString& aCrossOrigin,
+                          const nsAString& aIntegrity, bool aScriptFromHead,
+                          bool aAsync, bool aDefer, bool aNoModule,
+                          bool aLinkPreload,
+                          const ReferrerPolicy aReferrerPolicy);
+
+  /**
+   * Process a request that was deferred so that the script could be compiled
+   * off thread.
+   */
+  nsresult ProcessOffThreadRequest(ScriptLoadRequest* aRequest);
+
+  bool AddPendingChildLoader(ScriptLoader* aChild) {
+    // XXX(Bug 1631371) Check if this should use a fallible operation as it
+    // pretended earlier. Else, change the return type to void.
+    mPendingChildLoaders.AppendElement(aChild);
+    return true;
+  }
+
+  mozilla::dom::DocGroup* GetDocGroup() const;
+
+  /**
+   * Register the fact that we saw the load event, and that we need to save the
+   * bytecode at the next loop cycle unless new scripts are waiting in the
+   * pipeline.
+   */
+  void LoadEventFired();
+
+  /**
+   * Destroy and prevent the ScriptLoader or the ScriptLoadRequests from owning
+   * any references to the JSScript or to the Request which might be used for
+   * caching the encoded bytecode.
+   */
+  void Destroy();
+
+  /**
+   * Implement the HostResolveImportedModule abstract operation.
+   *
+   * Resolve a module specifier string and look this up in the module
+   * map, returning the result. This is only called for previously
+   * loaded modules and always succeeds.
+   *
+   * @param aReferencingPrivate A JS::Value which is either undefined
+   *                            or contains a LoadedScript private pointer.
+   * @param aSpecifier The module specifier.
+   * @param aModuleOut This is set to the module found.
+   */
+  static void ResolveImportedModule(JSContext* aCx,
+                                    JS::Handle<JS::Value> aReferencingPrivate,
+                                    JS::Handle<JSString*> aSpecifier,
+                                    JS::MutableHandle<JSObject*> aModuleOut);
+
+  void StartDynamicImport(ModuleLoadRequest* aRequest);
+
+  /**
+   * Shorthand Wrapper for JSAPI FinishDynamicImport function for the reject
+   * case where we do not have `aEvaluationPromise`. As there is no evaluation
+   * Promise, JS::FinishDynamicImport will always reject.
+   *
+   * @param aRequest
+   *        The module load request for the dynamic module.
+   * @param aResult
+   *        The result of running ModuleEvaluate -- If this is successful, then
+   *        we can await the associated EvaluationPromise.
+   */
+  void FinishDynamicImportAndReject(ModuleLoadRequest* aRequest,
+                                    nsresult aResult);
+
+  /**
+   * Wrapper for JSAPI FinishDynamicImport function. Takes an optional argument
+   * `aEvaluationPromise` which, if null, exits early.
+   *
+   * This is the non-tla version, which works with modules which return
+   * completion records.
+   *
+   * @param aCX
+   *        The JSContext for the module.
+   * @param aRequest
+   *        The module load request for the dynamic module.
+   * @param aResult
+   *        The result of running ModuleEvaluate
+   */
+  void FinishDynamicImport_NoTLA(JSContext* aCx, ModuleLoadRequest* aRequest,
+                                 nsresult aResult);
+
+  /**
+   * Wrapper for JSAPI FinishDynamicImport function. Takes an optional argument
+   * `aEvaluationPromise` which, if null, exits early.
+   *
+   * This is the Top Level Await version, which works with modules which return
+   * promises.
+   *
+   * @param aCX
+   *        The JSContext for the module.
+   * @param aRequest
+   *        The module load request for the dynamic module.
+   * @param aResult
+   *        The result of running ModuleEvaluate -- If this is successful, then
+   *        we can await the associated EvaluationPromise.
+   * @param aEvaluationPromise
+   *        The evaluation promise returned from evaluating the module. If this
+   *        is null, JS::FinishDynamicImport will reject the dynamic import
+   *        module promise.
+   */
+  void FinishDynamicImport(JSContext* aCx, ModuleLoadRequest* aRequest,
+                           nsresult aResult,
+                           JS::Handle<JSObject*> aEvaluationPromise);
+
+  /*
+   * Get the currently active script. This is used as the initiating script when
+   * executing timeout handler scripts.
+   */
+  static LoadedScript* GetActiveScript(JSContext* aCx);
+
+  Document* GetDocument() const { return mDocument; }
+
+  /**
+   *   Called by shutdown observer.
+   */
+  void Shutdown();
+
+ private:
+  virtual ~ScriptLoader();
+
+  void EnsureModuleHooksInitialized();
+
+  ScriptLoadRequest* CreateLoadRequest(ScriptKind aKind, nsIURI* aURI,
+                                       nsIScriptElement* aElement,
+                                       nsIPrincipal* aTriggeringPrincipal,
+                                       mozilla::CORSMode aCORSMode,
+                                       const SRIMetadata& aIntegrity,
+                                       ReferrerPolicy aReferrerPolicy);
+
+  /**
+   * Unblocks the creator parser of the parser-blocking scripts.
+   */
+  void UnblockParser(ScriptLoadRequest* aParserBlockingRequest);
+
+  /**
+   * Asynchronously resumes the creator parser of the parser-blocking scripts.
+   */
+  void ContinueParserAsync(ScriptLoadRequest* aParserBlockingRequest);
+
+  bool ProcessExternalScript(nsIScriptElement* aElement, ScriptKind aScriptKind,
+                             nsAutoString aTypeAttr,
+                             nsIContent* aScriptContent);
+
+  bool ProcessInlineScript(nsIScriptElement* aElement, ScriptKind aScriptKind);
+
+  ScriptLoadRequest* LookupPreloadRequest(nsIScriptElement* aElement,
+                                          ScriptKind aScriptKind,
+                                          const SRIMetadata& aSRIMetadata);
+
+  void GetSRIMetadata(const nsAString& aIntegrityAttr,
+                      SRIMetadata* aMetadataOut);
+
+  /**
+   * Given a script element, get the referrer policy should be applied to load
+   * requests.
+   */
+  ReferrerPolicy GetReferrerPolicy(nsIScriptElement* aElement);
+
+  /**
+   * Helper function to check the content policy for a given request.
+   */
+  static nsresult CheckContentPolicy(Document* aDocument, nsISupports* aContext,
+                                     const nsAString& aType,
+                                     ScriptLoadRequest* aRequest);
+
+  /**
+   * Helper function to determine whether an about: page loads a chrome: URI.
+   * Please note that this function only returns true if:
+   *   * the about: page uses a ContentPrincipal with scheme about:
+   *   * the about: page is not linkable from content
+   *     (e.g. the function will return false for about:blank or about:srcdoc)
+   */
+  static bool IsAboutPageLoadingChromeURI(ScriptLoadRequest* aRequest,
+                                          Document* aDocument);
+
+  /**
+   * Start a load for aRequest's URI.
+   */
+  nsresult StartLoad(ScriptLoadRequest* aRequest);
+
+  /**
+   * Abort the current stream, and re-start with a new load request from scratch
+   * without requesting any alternate data. Returns NS_BINDING_RETARGETED on
+   * success, as this error code is used to abort the input stream.
+   */
+  nsresult RestartLoad(ScriptLoadRequest* aRequest);
+
+  void HandleLoadError(ScriptLoadRequest* aRequest, nsresult aResult);
+
+  /**
+   * Process any pending requests asynchronously (i.e. off an event) if there
+   * are any. Note that this is a no-op if there aren't any currently pending
+   * requests.
+   *
+   * This function is virtual to allow cross-library calls to SetEnabled()
+   */
+  virtual void ProcessPendingRequestsAsync();
+
+  /**
+   * If true, the loader is ready to execute parser-blocking scripts, and so are
+   * all its ancestors.  If the loader itself is ready but some ancestor is not,
+   * this function will add an execute blocker and ask the ancestor to remove it
+   * once it becomes ready.
+   */
+  bool ReadyToExecuteParserBlockingScripts();
+
+  /**
+   * Return whether just this loader is ready to execute parser-blocking
+   * scripts.
+   */
+  bool SelfReadyToExecuteParserBlockingScripts() {
+    return ReadyToExecuteScripts() && !mParserBlockingBlockerCount;
+  }
+
+  /**
+   * Return whether this loader is ready to execute scripts in general.
+   */
+  bool ReadyToExecuteScripts() { return mEnabled && !mBlockerCount; }
+
+  nsresult VerifySRI(ScriptLoadRequest* aRequest,
+                     nsIIncrementalStreamLoader* aLoader, nsresult aSRIStatus,
+                     SRICheckDataVerifier* aSRIDataVerifier) const;
+
+  nsresult SaveSRIHash(ScriptLoadRequest* aRequest,
+                       SRICheckDataVerifier* aSRIDataVerifier,
+                       uint32_t* sriLength) const;
+
+  void ReportErrorToConsole(ScriptLoadRequest* aRequest,
+                            nsresult aResult) const;
+  void ReportPreloadErrorsToConsole(ScriptLoadRequest* aRequest);
+
+  nsresult AttemptAsyncScriptCompile(ScriptLoadRequest* aRequest,
+                                     bool* aCouldCompileOut);
+  nsresult ProcessRequest(ScriptLoadRequest* aRequest);
+  void ProcessDynamicImport(ModuleLoadRequest* aRequest);
+  nsresult CompileOffThreadOrProcessRequest(ScriptLoadRequest* aRequest);
+  void FireScriptAvailable(nsresult aResult, ScriptLoadRequest* aRequest);
+  void FireScriptEvaluated(nsresult aResult, ScriptLoadRequest* aRequest);
+  nsresult EvaluateScript(ScriptLoadRequest* aRequest);
+
+  /**
+   * Queue the current script load request to be saved, when the page
+   * initialization ends. The page initialization end is defined as being the
+   * time when the load event got received, and when no more scripts are waiting
+   * to be executed.
+   */
+  void RegisterForBytecodeEncoding(ScriptLoadRequest* aRequest);
+
+  /**
+   * Check if all conditions are met, i-e that the onLoad event fired and that
+   * no more script have to be processed.  If all conditions are met, queue an
+   * event to encode all the bytecode and save them on the cache.
+   */
+  void MaybeTriggerBytecodeEncoding();
+
+  /**
+   * Iterate over all script load request and save the bytecode of executed
+   * functions on the cache provided by the channel.
+   */
+  void EncodeBytecode();
+  void EncodeRequestBytecode(JSContext* aCx, ScriptLoadRequest* aRequest);
+
+  void GiveUpBytecodeEncoding();
+
+  already_AddRefed<nsIScriptGlobalObject> GetScriptGlobalObject();
+  nsresult FillCompileOptionsForRequest(const mozilla::dom::AutoJSAPI& jsapi,
+                                        ScriptLoadRequest* aRequest,
+                                        JS::Handle<JSObject*> aScopeChain,
+                                        JS::CompileOptions* aOptions);
+
+  uint32_t NumberOfProcessors();
+  nsresult PrepareLoadedRequest(ScriptLoadRequest* aRequest,
+                                nsIIncrementalStreamLoader* aLoader,
+                                nsresult aStatus);
+
+  void AddDeferRequest(ScriptLoadRequest* aRequest);
+  void AddAsyncRequest(ScriptLoadRequest* aRequest);
+  bool MaybeRemovedDeferRequests();
+
+  bool ShouldCompileOffThread(ScriptLoadRequest* aRequest);
+
+  void MaybeMoveToLoadedList(ScriptLoadRequest* aRequest);
+
+  using MaybeSourceText =
+      mozilla::MaybeOneOf<JS::SourceText<char16_t>, JS::SourceText<Utf8Unit>>;
+
+  // Get source text.  On success |aMaybeSource| will contain either UTF-8 or
+  // UTF-16 source; on failure it will remain in its initial state.
+  MOZ_MUST_USE nsresult GetScriptSource(JSContext* aCx,
+                                        ScriptLoadRequest* aRequest,
+                                        MaybeSourceText* aMaybeSource);
+
+  void SetModuleFetchStarted(ModuleLoadRequest* aRequest);
+  void SetModuleFetchFinishedAndResumeWaitingRequests(
+      ModuleLoadRequest* aRequest, nsresult aResult);
+
+  bool IsFetchingModule(ModuleLoadRequest* aRequest) const;
+
+  bool ModuleMapContainsURL(nsIURI* aURL) const;
+  RefPtr<mozilla::GenericNonExclusivePromise> WaitForModuleFetch(nsIURI* aURL);
+  ModuleScript* GetFetchedModule(nsIURI* aURL) const;
+
+  friend JSObject* HostResolveImportedModule(
+      JSContext* aCx, JS::Handle<JS::Value> aReferencingPrivate,
+      JS::Handle<JSString*> aSpecifier);
+
+  // Returns wether we should save the bytecode of this script after the
+  // execution of the script.
+  static bool ShouldCacheBytecode(ScriptLoadRequest* aRequest);
+
+  nsresult CreateModuleScript(ModuleLoadRequest* aRequest);
+  nsresult ProcessFetchedModuleSource(ModuleLoadRequest* aRequest);
+  void CheckModuleDependenciesLoaded(ModuleLoadRequest* aRequest);
+  void ProcessLoadedModuleTree(ModuleLoadRequest* aRequest);
+  bool InstantiateModuleTree(ModuleLoadRequest* aRequest);
+  JS::Value FindFirstParseError(ModuleLoadRequest* aRequest);
+  void StartFetchingModuleDependencies(ModuleLoadRequest* aRequest);
+
+  RefPtr<mozilla::GenericPromise> StartFetchingModuleAndDependencies(
+      ModuleLoadRequest* aParent, nsIURI* aURI);
+
+  nsresult InitDebuggerDataForModuleTree(JSContext* aCx,
+                                         ModuleLoadRequest* aRequest);
+
+  void RunScriptWhenSafe(ScriptLoadRequest* aRequest);
+
+  /**
+   *  Wait for any unused off thread compilations to finish and then
+   *  cancel them.
+   */
+  void CancelScriptLoadRequests();
+
+  Document* mDocument;  // [WEAK]
+  nsCOMArray<nsIScriptLoaderObserver> mObservers;
+  ScriptLoadRequestList mNonAsyncExternalScriptInsertedRequests;
+  // mLoadingAsyncRequests holds async requests while they're loading; when they
+  // have been loaded they are moved to mLoadedAsyncRequests.
+  ScriptLoadRequestList mLoadingAsyncRequests;
+  ScriptLoadRequestList mLoadedAsyncRequests;
+  ScriptLoadRequestList mDeferRequests;
+  ScriptLoadRequestList mXSLTRequests;
+  ScriptLoadRequestList mDynamicImportRequests;
+  RefPtr<ScriptLoadRequest> mParserBlockingRequest;
+
+  // List of script load request that are holding a buffer which has to be saved
+  // on the cache.
+  ScriptLoadRequestList mBytecodeEncodingQueue;
+
+  // In mRequests, the additional information here is stored by the element.
+  struct PreloadInfo {
+    RefPtr<ScriptLoadRequest> mRequest;
+    nsString mCharset;
+  };
+
+  friend void ImplCycleCollectionUnlink(ScriptLoader::PreloadInfo& aField);
+  friend void ImplCycleCollectionTraverse(
+      nsCycleCollectionTraversalCallback& aCallback,
+      ScriptLoader::PreloadInfo& aField, const char* aName, uint32_t aFlags);
+
+  struct PreloadRequestComparator {
+    bool Equals(const PreloadInfo& aPi,
+                ScriptLoadRequest* const& aRequest) const {
+      return aRequest == aPi.mRequest;
+    }
+  };
+
+  struct PreloadURIComparator {
+    bool Equals(const PreloadInfo& aPi, nsIURI* const& aURI) const;
+  };
+
+  nsTArray<PreloadInfo> mPreloads;
+
+  nsCOMPtr<nsIScriptElement> mCurrentScript;
+  nsCOMPtr<nsIScriptElement> mCurrentParserInsertedScript;
+  nsTArray<RefPtr<ScriptLoader>> mPendingChildLoaders;
+  uint32_t mParserBlockingBlockerCount;
+  uint32_t mBlockerCount;
+  uint32_t mNumberOfProcessors;
+  bool mEnabled;
+  bool mDeferEnabled;
+  bool mSpeculativeOMTParsingEnabled;
+  bool mDeferCheckpointReached;
+  bool mBlockingDOMContentLoaded;
+  bool mLoadEventFired;
+  bool mGiveUpEncoding;
+
+  // Module map
+  nsRefPtrHashtable<nsURIHashKey, mozilla::GenericNonExclusivePromise::Private>
+      mFetchingModules;
+  nsRefPtrHashtable<nsURIHashKey, ModuleScript> mFetchedModules;
+
+  nsCOMPtr<nsIConsoleReportCollector> mReporter;
+
+  // ShutdownObserver for off thread compilations
+  RefPtr<AsyncCompileShutdownObserver> mShutdownObserver;
+
+  // Logging
+ public:
+  static LazyLogModule gCspPRLog;
+  static LazyLogModule gScriptLoaderLog;
+};
+
+class nsAutoScriptLoaderDisabler {
+ public:
+  explicit nsAutoScriptLoaderDisabler(Document* aDoc);
+
+  ~nsAutoScriptLoaderDisabler();
+
+  bool mWasEnabled;
+  RefPtr<ScriptLoader> mLoader;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_ScriptLoader_h