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gecko-dev/dom/script/ScriptLoader.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_ScriptLoader_h
#define mozilla_dom_ScriptLoader_h
#include "nsCOMPtr.h"
#include "nsRefPtrHashtable.h"
#include "mozilla/Encoding.h"
#include "nsIScriptElement.h"
#include "nsCOMArray.h"
#include "nsCycleCollectionParticipant.h"
#include "nsTArray.h"
#include "nsAutoPtr.h"
#include "nsICacheInfoChannel.h"
#include "mozilla/dom/Document.h"
#include "nsIIncrementalStreamLoader.h"
#include "nsURIHashKey.h"
#include "mozilla/CORSMode.h"
#include "mozilla/dom/ScriptLoadRequest.h"
#include "mozilla/dom/SRIMetadata.h"
#include "mozilla/dom/SRICheck.h"
#include "mozilla/Maybe.h"
#include "mozilla/MozPromise.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "mozilla/StaticPrefs.h"
#include "mozilla/Utf8.h" // mozilla::Utf8Unit
#include "mozilla/Vector.h"
class nsIURI;
namespace JS {
template <typename UnitT>
class SourceText;
} // namespace JS
namespace mozilla {
namespace dom {
class AutoJSAPI;
class LoadedScript;
class ModuleLoadRequest;
class ModuleScript;
class ScriptLoadHandler;
class ScriptRequestProcessor;
//////////////////////////////////////////////////////////////
// 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;
}
/**
* 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() {
mDeferEnabled = true;
if (mDocument) {
mDocument->BlockOnload();
}
}
/**
* 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 stops 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 ParsingComplete(bool aTerminated);
/**
* 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,
const mozilla::net::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) {
return mPendingChildLoaders.AppendElement(aChild) != nullptr;
}
mozilla::dom::DocGroup* GetDocGroup() const {
return mDocument->GetDocGroup();
}
/**
* 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() { GiveUpBytecodeEncoding(); }
/**
* 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);
void FinishDynamicImport(ModuleLoadRequest* aRequest, nsresult aResult);
void FinishDynamicImport(JSContext* aCx, ModuleLoadRequest* aRequest,
nsresult aResult);
/*
* 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; }
private:
virtual ~ScriptLoader();
void EnsureModuleHooksInitialized();
ScriptLoadRequest* CreateLoadRequest(
ScriptKind aKind, nsIURI* aURI, nsIScriptElement* aElement,
nsIPrincipal* aTriggeringPrincipal, mozilla::CORSMode aCORSMode,
const SRIMetadata& aIntegrity,
mozilla::net::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);
void GetSRIMetadata(const nsAString& aIntegrityAttr,
SRIMetadata* aMetadataOut);
/**
* Given a script element, get the referrer policy should be applied to load
* requests.
*/
mozilla::net::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 CodeBasePrincipal 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);
/**
* 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) 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();
void MaybeMoveToLoadedList(ScriptLoadRequest* aRequest);
mozilla::Maybe<JS::SourceText<char16_t>> GetScriptSource(
JSContext* aCx, ScriptLoadRequest* aRequest);
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);
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 mDocumentParsingDone;
bool mBlockingDOMContentLoaded;
bool mLoadEventFired;
bool mGiveUpEncoding;
// Module map
nsRefPtrHashtable<nsURIHashKey, mozilla::GenericNonExclusivePromise::Private>
mFetchingModules;
nsRefPtrHashtable<nsURIHashKey, ModuleScript> mFetchedModules;
nsCOMPtr<nsIConsoleReportCollector> mReporter;
// Logging
public:
static LazyLogModule gCspPRLog;
static LazyLogModule gScriptLoaderLog;
};
class nsAutoScriptLoaderDisabler {
public:
explicit nsAutoScriptLoaderDisabler(Document* 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
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