726 lines
22 KiB
C++
726 lines
22 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_ScriptLoader_h
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#define mozilla_dom_ScriptLoader_h
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#include "nsCOMPtr.h"
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#include "nsRefPtrHashtable.h"
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#include "nsIUnicodeDecoder.h"
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#include "nsIScriptElement.h"
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#include "nsCOMArray.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsTArray.h"
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#include "nsAutoPtr.h"
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#include "nsIDocument.h"
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#include "nsIIncrementalStreamLoader.h"
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#include "nsURIHashKey.h"
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#include "mozilla/CORSMode.h"
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#include "mozilla/dom/SRIMetadata.h"
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#include "mozilla/dom/SRICheck.h"
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#include "mozilla/MozPromise.h"
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#include "mozilla/net/ReferrerPolicy.h"
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#include "mozilla/Vector.h"
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class nsIURI;
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namespace JS {
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class SourceBufferHolder;
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} // namespace JS
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namespace mozilla {
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namespace dom {
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class AutoJSAPI;
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class ModuleLoadRequest;
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class ModuleScript;
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class ScriptLoadRequestList;
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//////////////////////////////////////////////////////////////
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// Per-request data structure
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//////////////////////////////////////////////////////////////
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enum class ScriptKind {
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Classic,
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Module
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};
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class ScriptLoadRequest : public nsISupports,
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private mozilla::LinkedListElement<ScriptLoadRequest>
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{
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typedef LinkedListElement<ScriptLoadRequest> super;
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// Allow LinkedListElement<ScriptLoadRequest> to cast us to itself as needed.
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friend class mozilla::LinkedListElement<ScriptLoadRequest>;
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friend class ScriptLoadRequestList;
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protected:
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virtual ~ScriptLoadRequest();
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public:
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ScriptLoadRequest(ScriptKind aKind,
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nsIURI* aURI,
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nsIScriptElement* aElement,
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uint32_t aVersion,
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mozilla::CORSMode aCORSMode,
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const SRIMetadata& aIntegrity,
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nsIURI* aReferrer,
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mozilla::net::ReferrerPolicy aReferrerPolicy)
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: mKind(aKind),
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mElement(aElement),
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mProgress(Progress::Loading),
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mScriptMode(ScriptMode::eBlocking),
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mIsInline(true),
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mHasSourceMapURL(false),
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mInDeferList(false),
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mInAsyncList(false),
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mIsNonAsyncScriptInserted(false),
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mIsXSLT(false),
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mIsCanceled(false),
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mWasCompiledOMT(false),
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mOffThreadToken(nullptr),
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mScriptTextBuf(nullptr),
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mScriptTextLength(0),
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mJSVersion(aVersion),
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mURI(aURI),
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mLineNo(1),
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mCORSMode(aCORSMode),
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mIntegrity(aIntegrity),
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mReferrer(aReferrer),
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mReferrerPolicy(aReferrerPolicy)
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{
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}
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(ScriptLoadRequest)
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bool IsModuleRequest() const
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{
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return mKind == ScriptKind::Module;
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}
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ModuleLoadRequest* AsModuleRequest();
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void FireScriptAvailable(nsresult aResult)
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{
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bool isInlineClassicScript = mIsInline && !IsModuleRequest();
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mElement->ScriptAvailable(aResult, mElement, isInlineClassicScript, mURI, mLineNo);
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}
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void FireScriptEvaluated(nsresult aResult)
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{
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mElement->ScriptEvaluated(aResult, mElement, mIsInline);
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}
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bool IsPreload()
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{
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return mElement == nullptr;
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}
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virtual void Cancel();
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bool IsCanceled() const
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{
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return mIsCanceled;
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}
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virtual void SetReady();
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void** OffThreadTokenPtr()
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{
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return mOffThreadToken ? &mOffThreadToken : nullptr;
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}
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enum class Progress {
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Loading,
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Compiling,
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FetchingImports,
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Ready
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};
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bool IsReadyToRun() const {
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return mProgress == Progress::Ready;
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}
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bool IsLoading() const {
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return mProgress == Progress::Loading;
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}
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bool InCompilingStage() const {
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return mProgress == Progress::Compiling ||
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(IsReadyToRun() && mWasCompiledOMT);
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}
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enum class ScriptMode : uint8_t {
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eBlocking,
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eDeferred,
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eAsync
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};
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void SetScriptMode(bool aDeferAttr, bool aAsyncAttr);
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bool IsBlockingScript() const
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{
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return mScriptMode == ScriptMode::eBlocking;
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}
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bool IsDeferredScript() const
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{
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return mScriptMode == ScriptMode::eDeferred;
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}
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bool IsAsyncScript() const
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{
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return mScriptMode == ScriptMode::eAsync;
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}
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virtual bool IsTopLevel() const
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{
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// Classic scripts are always top level.
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return true;
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}
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void MaybeCancelOffThreadScript();
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using super::getNext;
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using super::isInList;
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const ScriptKind mKind;
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nsCOMPtr<nsIScriptElement> mElement;
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Progress mProgress; // Are we still waiting for a load to complete?
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ScriptMode mScriptMode; // Whether this script is blocking, deferred or async.
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bool mIsInline; // Is the script inline or loaded?
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bool mHasSourceMapURL; // Does the HTTP header have a source map url?
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bool mInDeferList; // True if we live in mDeferRequests.
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bool mInAsyncList; // True if we live in mLoadingAsyncRequests or mLoadedAsyncRequests.
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bool mIsNonAsyncScriptInserted; // True if we live in mNonAsyncExternalScriptInsertedRequests
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bool mIsXSLT; // True if we live in mXSLTRequests.
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bool mIsCanceled; // True if we have been explicitly canceled.
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bool mWasCompiledOMT; // True if the script has been compiled off main thread.
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void* mOffThreadToken; // Off-thread parsing token.
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nsString mSourceMapURL; // Holds source map url for loaded scripts
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char16_t* mScriptTextBuf; // Holds script text for non-inline scripts. Don't
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size_t mScriptTextLength; // use nsString so we can give ownership to jsapi.
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uint32_t mJSVersion;
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const nsCOMPtr<nsIURI> mURI;
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nsCOMPtr<nsIPrincipal> mOriginPrincipal;
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nsAutoCString mURL; // Keep the URI's filename alive during off thread parsing.
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int32_t mLineNo;
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const mozilla::CORSMode mCORSMode;
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const SRIMetadata mIntegrity;
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const nsCOMPtr<nsIURI> mReferrer;
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const mozilla::net::ReferrerPolicy mReferrerPolicy;
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};
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class ScriptLoadRequestList : private mozilla::LinkedList<ScriptLoadRequest>
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{
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typedef mozilla::LinkedList<ScriptLoadRequest> super;
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public:
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~ScriptLoadRequestList();
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void Clear();
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#ifdef DEBUG
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bool Contains(ScriptLoadRequest* aElem) const;
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#endif // DEBUG
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using super::getFirst;
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using super::isEmpty;
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void AppendElement(ScriptLoadRequest* aElem)
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{
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MOZ_ASSERT(!aElem->isInList());
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NS_ADDREF(aElem);
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insertBack(aElem);
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}
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MOZ_MUST_USE
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already_AddRefed<ScriptLoadRequest> Steal(ScriptLoadRequest* aElem)
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{
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aElem->removeFrom(*this);
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return dont_AddRef(aElem);
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}
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MOZ_MUST_USE
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already_AddRefed<ScriptLoadRequest> StealFirst()
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{
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MOZ_ASSERT(!isEmpty());
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return Steal(getFirst());
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}
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void Remove(ScriptLoadRequest* aElem)
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{
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aElem->removeFrom(*this);
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NS_RELEASE(aElem);
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}
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};
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class ScriptLoadHandler;
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//////////////////////////////////////////////////////////////
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// Script loader implementation
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//////////////////////////////////////////////////////////////
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class ScriptLoader final : public nsISupports
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{
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class MOZ_STACK_CLASS AutoCurrentScriptUpdater
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{
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public:
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AutoCurrentScriptUpdater(ScriptLoader* aScriptLoader,
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nsIScriptElement* aCurrentScript)
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: mOldScript(aScriptLoader->mCurrentScript)
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, mScriptLoader(aScriptLoader)
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{
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mScriptLoader->mCurrentScript = aCurrentScript;
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}
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~AutoCurrentScriptUpdater()
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{
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mScriptLoader->mCurrentScript.swap(mOldScript);
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}
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private:
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nsCOMPtr<nsIScriptElement> mOldScript;
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ScriptLoader* mScriptLoader;
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};
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friend class ModuleLoadRequest;
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friend class ScriptRequestProcessor;
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friend class ScriptLoadHandler;
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friend class AutoCurrentScriptUpdater;
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public:
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explicit ScriptLoader(nsIDocument* aDocument);
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(ScriptLoader)
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/**
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* The loader maintains a weak reference to the document with
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* which it is initialized. This call forces the reference to
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* be dropped.
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*/
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void DropDocumentReference()
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{
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mDocument = nullptr;
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}
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/**
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* Add an observer for all scripts loaded through this loader.
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*
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* @param aObserver observer for all script processing.
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*/
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nsresult AddObserver(nsIScriptLoaderObserver* aObserver)
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{
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return mObservers.AppendObject(aObserver) ? NS_OK :
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NS_ERROR_OUT_OF_MEMORY;
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}
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/**
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* Remove an observer.
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*
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* @param aObserver observer to be removed
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*/
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void RemoveObserver(nsIScriptLoaderObserver* aObserver)
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{
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mObservers.RemoveObject(aObserver);
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}
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/**
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* Process a script element. This will include both loading the
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* source of the element if it is not inline and evaluating
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* the script itself.
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*
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* If the script is an inline script that can be executed immediately
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* (i.e. there are no other scripts pending) then ScriptAvailable
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* and ScriptEvaluated will be called before the function returns.
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*
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* If true is returned the script could not be executed immediately.
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* In this case ScriptAvailable is guaranteed to be called at a later
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* point (as well as possibly ScriptEvaluated).
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*
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* @param aElement The element representing the script to be loaded and
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* evaluated.
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*/
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bool ProcessScriptElement(nsIScriptElement* aElement);
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/**
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* Gets the currently executing script. This is useful if you want to
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* generate a unique key based on the currently executing script.
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*/
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nsIScriptElement* GetCurrentScript()
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{
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return mCurrentScript;
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}
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nsIScriptElement* GetCurrentParserInsertedScript()
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{
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return mCurrentParserInsertedScript;
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}
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/**
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* Whether the loader is enabled or not.
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* When disabled, processing of new script elements is disabled.
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* Any call to ProcessScriptElement() will return false. Note that
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* this DOES NOT disable currently loading or executing scripts.
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*/
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bool GetEnabled()
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{
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return mEnabled;
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}
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void SetEnabled(bool aEnabled)
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{
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if (!mEnabled && aEnabled) {
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ProcessPendingRequestsAsync();
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}
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mEnabled = aEnabled;
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}
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/**
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* Add/remove a blocker for parser-blocking scripts (and XSLT
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* scripts). Blockers will stop such scripts from executing, but not from
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* loading.
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*/
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void AddParserBlockingScriptExecutionBlocker()
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{
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++mParserBlockingBlockerCount;
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}
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void RemoveParserBlockingScriptExecutionBlocker()
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{
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if (!--mParserBlockingBlockerCount && ReadyToExecuteScripts()) {
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ProcessPendingRequestsAsync();
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}
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}
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/**
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* Add/remove a blocker for execution of all scripts. Blockers will stop
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* scripts from executing, but not from loading.
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*/
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void AddExecuteBlocker()
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{
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++mBlockerCount;
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}
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void RemoveExecuteBlocker()
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{
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MOZ_ASSERT(mBlockerCount);
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if (!--mBlockerCount) {
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ProcessPendingRequestsAsync();
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}
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}
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/**
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* Convert the given buffer to a UTF-16 string.
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* @param aChannel Channel corresponding to the data. May be null.
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* @param aData The data to convert
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* @param aLength Length of the data
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* @param aHintCharset Hint for the character set (e.g., from a charset
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* attribute). May be the empty string.
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* @param aDocument Document which the data is loaded for. Must not be
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* null.
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* @param aBufOut [out] char16_t array allocated by ConvertToUTF16 and
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* containing data converted to unicode. Caller must
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* js_free() this data when no longer needed.
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* @param aLengthOut [out] Length of array returned in aBufOut in number
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* of char16_t code units.
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*/
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static nsresult ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData,
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uint32_t aLength,
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const nsAString& aHintCharset,
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nsIDocument* aDocument,
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char16_t*& aBufOut, size_t& aLengthOut);
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/**
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* Handle the completion of a stream. This is called by the
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* ScriptLoadHandler object which observes the IncrementalStreamLoader
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* loading the script.
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*/
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nsresult OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
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nsISupports* aContext,
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nsresult aChannelStatus,
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nsresult aSRIStatus,
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mozilla::Vector<char16_t> &aString,
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mozilla::dom::SRICheckDataVerifier* aSRIDataVerifier);
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/**
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* Processes any pending requests that are ready for processing.
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*/
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void ProcessPendingRequests();
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/**
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* Starts deferring deferred scripts and puts them in the mDeferredRequests
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* queue instead.
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*/
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void BeginDeferringScripts()
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{
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mDeferEnabled = true;
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if (mDocument) {
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mDocument->BlockOnload();
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}
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}
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/**
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* Notifies the script loader that parsing is done. If aTerminated is true,
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* this will drop any pending scripts that haven't run yet. Otherwise, it
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* will stops deferring scripts and immediately processes the
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* mDeferredRequests queue.
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*
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* WARNING: This function will synchronously execute content scripts, so be
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* prepared that the world might change around you.
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*/
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void ParsingComplete(bool aTerminated);
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/**
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* Returns the number of pending scripts, deferred or not.
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*/
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uint32_t HasPendingOrCurrentScripts()
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{
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return mCurrentScript || mParserBlockingRequest;
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}
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/**
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* Adds aURI to the preload list and starts loading it.
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*
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* @param aURI The URI of the external script.
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* @param aCharset The charset parameter for the script.
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* @param aType The type parameter for the script.
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* @param aCrossOrigin The crossorigin attribute for the script.
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* Void if not present.
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* @param aIntegrity The expect hash url, if avail, of the request
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* @param aScriptFromHead Whether or not the script was a child of head
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*/
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virtual void PreloadURI(nsIURI *aURI,
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const nsAString &aCharset,
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const nsAString &aType,
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const nsAString &aCrossOrigin,
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const nsAString& aIntegrity,
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bool aScriptFromHead,
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bool aAsync,
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bool aDefer,
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bool aNoModule,
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const mozilla::net::ReferrerPolicy aReferrerPolicy);
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/**
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* Process a request that was deferred so that the script could be compiled
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* off thread.
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*/
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nsresult ProcessOffThreadRequest(ScriptLoadRequest *aRequest);
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bool AddPendingChildLoader(ScriptLoader* aChild) {
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return mPendingChildLoaders.AppendElement(aChild) != nullptr;
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}
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/*
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* Clear the map of loaded modules. Called when a Document object is reused
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* for a different global.
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*/
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void ClearModuleMap();
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private:
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virtual ~ScriptLoader();
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ScriptLoadRequest* CreateLoadRequest(ScriptKind aKind,
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nsIURI* aURI,
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nsIScriptElement* aElement,
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uint32_t aVersion,
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mozilla::CORSMode aCORSMode,
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const SRIMetadata& aIntegrity,
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mozilla::net::ReferrerPolicy aReferrerPolicy);
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/**
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* Unblocks the creator parser of the parser-blocking scripts.
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*/
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void UnblockParser(ScriptLoadRequest* aParserBlockingRequest);
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/**
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* Asynchronously resumes the creator parser of the parser-blocking scripts.
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*/
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void ContinueParserAsync(ScriptLoadRequest* aParserBlockingRequest);
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/**
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* Helper function to check the content policy for a given request.
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*/
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static nsresult CheckContentPolicy(nsIDocument* aDocument,
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nsISupports *aContext,
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nsIURI *aURI,
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const nsAString &aType,
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bool aIsPreLoad);
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/**
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* Start a load for aRequest's URI.
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*/
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nsresult StartLoad(ScriptLoadRequest *aRequest, const nsAString &aType,
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bool aScriptFromHead);
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void HandleLoadError(ScriptLoadRequest *aRequest, nsresult aResult);
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/**
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* Process any pending requests asynchronously (i.e. off an event) if there
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* are any. Note that this is a no-op if there aren't any currently pending
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* requests.
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*
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* This function is virtual to allow cross-library calls to SetEnabled()
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*/
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virtual void ProcessPendingRequestsAsync();
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/**
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* If true, the loader is ready to execute parser-blocking scripts, and so are
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* all its ancestors. If the loader itself is ready but some ancestor is not,
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* this function will add an execute blocker and ask the ancestor to remove it
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* 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 AttemptAsyncScriptCompile(ScriptLoadRequest* aRequest);
|
|
nsresult ProcessRequest(ScriptLoadRequest* aRequest);
|
|
nsresult CompileOffThreadOrProcessRequest(ScriptLoadRequest* aRequest);
|
|
void FireScriptAvailable(nsresult aResult,
|
|
ScriptLoadRequest* aRequest);
|
|
void FireScriptEvaluated(nsresult aResult,
|
|
ScriptLoadRequest* aRequest);
|
|
nsresult EvaluateScript(ScriptLoadRequest* aRequest);
|
|
|
|
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,
|
|
mozilla::Vector<char16_t> &aString);
|
|
|
|
void AddDeferRequest(ScriptLoadRequest* aRequest);
|
|
void AddAsyncRequest(ScriptLoadRequest* aRequest);
|
|
bool MaybeRemovedDeferRequests();
|
|
|
|
void MaybeMoveToLoadedList(ScriptLoadRequest* aRequest);
|
|
|
|
JS::SourceBufferHolder GetScriptSource(ScriptLoadRequest* aRequest,
|
|
nsAutoString& inlineData);
|
|
|
|
void SetModuleFetchStarted(ModuleLoadRequest *aRequest);
|
|
void SetModuleFetchFinishedAndResumeWaitingRequests(ModuleLoadRequest *aRequest,
|
|
nsresult aResult);
|
|
|
|
bool IsFetchingModule(ModuleLoadRequest *aRequest) const;
|
|
|
|
bool ModuleMapContainsURL(nsIURI* aURL) const;
|
|
RefPtr<mozilla::GenericPromise> WaitForModuleFetch(nsIURI* aURL);
|
|
ModuleScript* GetFetchedModule(nsIURI* aURL) const;
|
|
|
|
friend JSObject*
|
|
HostResolveImportedModule(JSContext* aCx, JS::Handle<JSObject*> aModule,
|
|
JS::Handle<JSString*> aSpecifier);
|
|
|
|
nsresult CreateModuleScript(ModuleLoadRequest* aRequest);
|
|
nsresult ProcessFetchedModuleSource(ModuleLoadRequest* aRequest);
|
|
void CheckModuleDependenciesLoaded(ModuleLoadRequest* aRequest);
|
|
void ProcessLoadedModuleTree(ModuleLoadRequest* aRequest);
|
|
JS::Value FindFirstParseError(ModuleLoadRequest* aRequest);
|
|
bool InstantiateModuleTree(ModuleLoadRequest* aRequest);
|
|
void StartFetchingModuleDependencies(ModuleLoadRequest* aRequest);
|
|
|
|
RefPtr<mozilla::GenericPromise>
|
|
StartFetchingModuleAndDependencies(ModuleLoadRequest* aParent, nsIURI* aURI);
|
|
|
|
nsIDocument* 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;
|
|
RefPtr<ScriptLoadRequest> mParserBlockingRequest;
|
|
|
|
// 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 mDocumentParsingDone;
|
|
bool mBlockingDOMContentLoaded;
|
|
|
|
// Module map
|
|
nsRefPtrHashtable<nsURIHashKey, mozilla::GenericPromise::Private> mFetchingModules;
|
|
nsRefPtrHashtable<nsURIHashKey, ModuleScript> mFetchedModules;
|
|
|
|
nsCOMPtr<nsIConsoleReportCollector> mReporter;
|
|
};
|
|
|
|
class nsAutoScriptLoaderDisabler
|
|
{
|
|
public:
|
|
explicit nsAutoScriptLoaderDisabler(nsIDocument* aDoc)
|
|
{
|
|
mLoader = aDoc->ScriptLoader();
|
|
mWasEnabled = mLoader->GetEnabled();
|
|
if (mWasEnabled) {
|
|
mLoader->SetEnabled(false);
|
|
}
|
|
}
|
|
|
|
~nsAutoScriptLoaderDisabler()
|
|
{
|
|
if (mWasEnabled) {
|
|
mLoader->SetEnabled(true);
|
|
}
|
|
}
|
|
|
|
bool mWasEnabled;
|
|
RefPtr<ScriptLoader> mLoader;
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif //mozilla_dom_ScriptLoader_h
|