forked from mirrors/gecko-dev
632 lines
20 KiB
C++
632 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "mozilla/Encoding.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 "nsICacheInfoChannel.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/DOMPrefs.h"
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#include "mozilla/dom/ScriptLoadRequest.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 ScriptLoadHandler;
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class ScriptRequestProcessor;
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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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nsCOMPtr<nsINode> node = do_QueryInterface(aCurrentScript);
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mScriptLoader->mCurrentScript =
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node && !node->IsInShadowTree() ? aCurrentScript : nullptr;
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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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static inline nsresult
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ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData,
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uint32_t aLength, const nsAString& aHintCharset,
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nsIDocument* aDocument,
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JS::UniqueTwoByteChars& aBufOut, size_t& aLengthOut)
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{
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char16_t* bufOut;
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nsresult rv = ConvertToUTF16(aChannel, aData, aLength, aHintCharset,
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aDocument, bufOut, aLengthOut);
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if (NS_SUCCEEDED(rv)) {
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aBufOut.reset(bufOut);
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}
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return rv;
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};
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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. The streamed content is expected to be stored on the
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* aRequest argument.
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*/
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nsresult OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
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ScriptLoadRequest* aRequest,
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nsresult aChannelStatus,
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nsresult aSRIStatus,
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SRICheckDataVerifier* aSRIDataVerifier);
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/**
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* Returns wether any request is queued, and not executed yet.
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*/
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bool HasPendingRequests();
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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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{
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return mPendingChildLoaders.AppendElement(aChild) != nullptr;
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}
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mozilla::dom::DocGroup* GetDocGroup() const
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{
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return mDocument->GetDocGroup();
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}
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/**
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* Register the fact that we saw the load event, and that we need to save the
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* bytecode at the next loop cycle unless new scripts are waiting in the
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* pipeline.
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*/
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void LoadEventFired();
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/**
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* Destroy and prevent the ScriptLoader or the ScriptLoadRequests from owning
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* any references to the JSScript or to the Request which might be used for
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* caching the encoded bytecode.
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*/
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void Destroy()
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{
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GiveUpBytecodeEncoding();
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}
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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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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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bool ProcessExternalScript(nsIScriptElement* aElement,
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ScriptKind aScriptKind,
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nsAutoString aTypeAttr,
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nsIContent* aScriptContent);
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bool ProcessInlineScript(nsIScriptElement* aElement,
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ScriptKind aScriptKind);
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ScriptLoadRequest* LookupPreloadRequest(nsIScriptElement* aElement,
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ScriptKind aScriptKind);
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void GetSRIMetadata(const nsAString& aIntegrityAttr,
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SRIMetadata *aMetadataOut);
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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);
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/**
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* Abort the current stream, and re-start with a new load request from scratch
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* without requesting any alternate data. Returns NS_BINDING_RETARGETED on
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* success, as this error code is used to abort the input stream.
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*/
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nsresult RestartLoad(ScriptLoadRequest* aRequest);
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void HandleLoadError(ScriptLoadRequest *aRequest, nsresult aResult);
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static bool BinASTEncodingEnabled()
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{
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#ifdef JS_BUILD_BINAST
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return DOMPrefs::BinASTEncodingEnabled();
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#else
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return false;
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#endif
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}
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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.
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*/
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bool ReadyToExecuteParserBlockingScripts();
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/**
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* Return whether just this loader is ready to execute parser-blocking
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* scripts.
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*/
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bool SelfReadyToExecuteParserBlockingScripts()
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{
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return ReadyToExecuteScripts() && !mParserBlockingBlockerCount;
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}
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/**
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* Return whether this loader is ready to execute scripts in general.
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*/
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bool ReadyToExecuteScripts()
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{
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return mEnabled && !mBlockerCount;
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}
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nsresult VerifySRI(ScriptLoadRequest *aRequest,
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nsIIncrementalStreamLoader* aLoader,
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nsresult aSRIStatus,
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SRICheckDataVerifier* aSRIDataVerifier) const;
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nsresult SaveSRIHash(ScriptLoadRequest *aRequest,
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SRICheckDataVerifier* aSRIDataVerifier) const;
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void ReportErrorToConsole(ScriptLoadRequest *aRequest, nsresult aResult) const;
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nsresult AttemptAsyncScriptCompile(ScriptLoadRequest* aRequest);
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nsresult ProcessRequest(ScriptLoadRequest* aRequest);
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nsresult CompileOffThreadOrProcessRequest(ScriptLoadRequest* aRequest);
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void FireScriptAvailable(nsresult aResult,
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ScriptLoadRequest* aRequest);
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void FireScriptEvaluated(nsresult aResult,
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ScriptLoadRequest* aRequest);
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nsresult EvaluateScript(ScriptLoadRequest* aRequest);
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/**
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* Queue the current script load request to be saved, when the page
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* initialization ends. The page initialization end is defined as being the
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* time when the load event got received, and when no more scripts are waiting
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* to be executed.
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*/
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void RegisterForBytecodeEncoding(ScriptLoadRequest* aRequest);
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/**
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* Check if all conditions are met, i-e that the onLoad event fired and that
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* no more script have to be processed. If all conditions are met, queue an
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* event to encode all the bytecode and save them on the cache.
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*/
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void MaybeTriggerBytecodeEncoding();
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/**
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* Iterate over all script load request and save the bytecode of executed
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* functions on the cache provided by the channel.
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*/
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void EncodeBytecode();
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void EncodeRequestBytecode(JSContext* aCx, ScriptLoadRequest* aRequest);
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void GiveUpBytecodeEncoding();
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already_AddRefed<nsIScriptGlobalObject> GetScriptGlobalObject();
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nsresult FillCompileOptionsForRequest(const mozilla::dom::AutoJSAPI& jsapi,
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ScriptLoadRequest* aRequest,
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JS::Handle<JSObject*> aScopeChain,
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JS::CompileOptions* aOptions);
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uint32_t NumberOfProcessors();
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nsresult PrepareLoadedRequest(ScriptLoadRequest* aRequest,
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nsIIncrementalStreamLoader* aLoader,
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nsresult aStatus);
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void AddDeferRequest(ScriptLoadRequest* aRequest);
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void AddAsyncRequest(ScriptLoadRequest* aRequest);
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bool MaybeRemovedDeferRequests();
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void MaybeMoveToLoadedList(ScriptLoadRequest* aRequest);
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JS::SourceBufferHolder GetScriptSource(ScriptLoadRequest* aRequest,
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nsAutoString& inlineData);
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void SetModuleFetchStarted(ModuleLoadRequest *aRequest);
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void SetModuleFetchFinishedAndResumeWaitingRequests(ModuleLoadRequest* aRequest,
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nsresult aResult);
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bool IsFetchingModule(ModuleLoadRequest* aRequest) const;
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bool ModuleMapContainsURL(nsIURI* aURL) const;
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RefPtr<mozilla::GenericPromise> WaitForModuleFetch(nsIURI* aURL);
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ModuleScript* GetFetchedModule(nsIURI* aURL) const;
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friend JSObject*
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HostResolveImportedModule(JSContext* aCx, JS::Handle<JSObject*> aModule,
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JS::Handle<JSString*> aSpecifier);
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// Returns wether we should save the bytecode of this script after the
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// execution of the script.
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static bool
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ShouldCacheBytecode(ScriptLoadRequest* aRequest);
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nsresult CreateModuleScript(ModuleLoadRequest* aRequest);
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nsresult ProcessFetchedModuleSource(ModuleLoadRequest* aRequest);
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void CheckModuleDependenciesLoaded(ModuleLoadRequest* aRequest);
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void ProcessLoadedModuleTree(ModuleLoadRequest* aRequest);
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bool InstantiateModuleTree(ModuleLoadRequest* aRequest);
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JS::Value FindFirstParseError(ModuleLoadRequest* aRequest);
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void StartFetchingModuleDependencies(ModuleLoadRequest* aRequest);
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RefPtr<mozilla::GenericPromise>
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StartFetchingModuleAndDependencies(ModuleLoadRequest* aParent, nsIURI* aURI);
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nsIDocument* mDocument; // [WEAK]
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nsCOMArray<nsIScriptLoaderObserver> mObservers;
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ScriptLoadRequestList mNonAsyncExternalScriptInsertedRequests;
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// mLoadingAsyncRequests holds async requests while they're loading; when they
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// have been loaded they are moved to mLoadedAsyncRequests.
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ScriptLoadRequestList mLoadingAsyncRequests;
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ScriptLoadRequestList mLoadedAsyncRequests;
|
|
ScriptLoadRequestList mDeferRequests;
|
|
ScriptLoadRequestList mXSLTRequests;
|
|
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 mDocumentParsingDone;
|
|
bool mBlockingDOMContentLoaded;
|
|
bool mLoadEventFired;
|
|
bool mGiveUpEncoding;
|
|
|
|
// Module map
|
|
nsRefPtrHashtable<nsURIHashKey, mozilla::GenericPromise::Private> mFetchingModules;
|
|
nsRefPtrHashtable<nsURIHashKey, ModuleScript> mFetchedModules;
|
|
|
|
nsCOMPtr<nsIConsoleReportCollector> mReporter;
|
|
|
|
// Logging
|
|
static LazyLogModule gCspPRLog;
|
|
static LazyLogModule gScriptLoaderLog;
|
|
};
|
|
|
|
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
|