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-rw-r--r--dom/script/ModuleLoadRequest.cpp139
-rw-r--r--dom/script/ModuleLoadRequest.h87
-rw-r--r--dom/script/ModuleScript.cpp122
-rw-r--r--dom/script/ModuleScript.h53
-rw-r--r--dom/script/ScriptElement.cpp150
-rw-r--r--dom/script/ScriptElement.h58
-rw-r--r--dom/script/ScriptLoadHandler.cpp216
-rw-r--r--dom/script/ScriptLoadHandler.h76
-rw-r--r--dom/script/ScriptLoader.cpp2622
-rw-r--r--dom/script/ScriptLoader.h669
-rw-r--r--dom/script/ScriptSettings.cpp839
-rw-r--r--dom/script/ScriptSettings.h465
-rw-r--r--dom/script/moz.build36
-rw-r--r--dom/script/nsIScriptElement.h329
-rw-r--r--dom/script/nsIScriptLoaderObserver.idl47
15 files changed, 5908 insertions, 0 deletions
diff --git a/dom/script/ModuleLoadRequest.cpp b/dom/script/ModuleLoadRequest.cpp
new file mode 100644
index 000000000..d62214304
--- /dev/null
+++ b/dom/script/ModuleLoadRequest.cpp
@@ -0,0 +1,139 @@
+/* -*- 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/. */
+
+#include "ModuleLoadRequest.h"
+#include "ModuleScript.h"
+#include "ScriptLoader.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(ModuleLoadRequest)
+NS_INTERFACE_MAP_END_INHERITING(ScriptLoadRequest)
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ModuleLoadRequest, ScriptLoadRequest,
+ mBaseURL,
+ mLoader,
+ mParent,
+ mModuleScript,
+ mImports)
+
+NS_IMPL_ADDREF_INHERITED(ModuleLoadRequest, ScriptLoadRequest)
+NS_IMPL_RELEASE_INHERITED(ModuleLoadRequest, ScriptLoadRequest)
+
+ModuleLoadRequest::ModuleLoadRequest(nsIScriptElement* aElement,
+ uint32_t aVersion,
+ CORSMode aCORSMode,
+ const SRIMetadata &aIntegrity,
+ ScriptLoader* aLoader)
+ : ScriptLoadRequest(ScriptKind::Module,
+ aElement,
+ aVersion,
+ aCORSMode,
+ aIntegrity),
+ mIsTopLevel(true),
+ mLoader(aLoader)
+{}
+
+void ModuleLoadRequest::Cancel()
+{
+ ScriptLoadRequest::Cancel();
+ mModuleScript = nullptr;
+ mProgress = ScriptLoadRequest::Progress::Ready;
+ CancelImports();
+ mReady.RejectIfExists(NS_ERROR_DOM_ABORT_ERR, __func__);
+}
+
+void
+ModuleLoadRequest::CancelImports()
+{
+ for (size_t i = 0; i < mImports.Length(); i++) {
+ mImports[i]->Cancel();
+ }
+}
+
+void
+ModuleLoadRequest::SetReady()
+{
+ // Mark a module as ready to execute. This means that this module and all it
+ // dependencies have had their source loaded, parsed as a module and the
+ // modules instantiated.
+ //
+ // The mReady promise is used to ensure that when all dependencies of a module
+ // have become ready, DependenciesLoaded is called on that module
+ // request. This is set up in StartFetchingModuleDependencies.
+
+#ifdef DEBUG
+ for (size_t i = 0; i < mImports.Length(); i++) {
+ MOZ_ASSERT(mImports[i]->IsReadyToRun());
+ }
+#endif
+
+ ScriptLoadRequest::SetReady();
+ mReady.ResolveIfExists(true, __func__);
+}
+
+void
+ModuleLoadRequest::ModuleLoaded()
+{
+ // A module that was found to be marked as fetching in the module map has now
+ // been loaded.
+
+ mModuleScript = mLoader->GetFetchedModule(mURI);
+ if (!mModuleScript || mModuleScript->IsErrored()) {
+ ModuleErrored();
+ return;
+ }
+
+ mLoader->StartFetchingModuleDependencies(this);
+}
+
+void
+ModuleLoadRequest::ModuleErrored()
+{
+ mLoader->CheckModuleDependenciesLoaded(this);
+ MOZ_ASSERT(!mModuleScript || mModuleScript->IsErrored());
+
+ CancelImports();
+ SetReady();
+ LoadFinished();
+}
+
+void
+ModuleLoadRequest::DependenciesLoaded()
+{
+ // The module and all of its dependencies have been successfully fetched and
+ // compiled.
+
+ MOZ_ASSERT(mModuleScript);
+
+ mLoader->CheckModuleDependenciesLoaded(this);
+ SetReady();
+ LoadFinished();
+}
+
+void
+ModuleLoadRequest::LoadFailed()
+{
+ // We failed to load the source text or an error occurred unrelated to the
+ // content of the module (e.g. OOM).
+
+ MOZ_ASSERT(!mModuleScript);
+
+ Cancel();
+ LoadFinished();
+}
+
+void
+ModuleLoadRequest::LoadFinished()
+{
+ mLoader->ProcessLoadedModuleTree(this);
+ mLoader = nullptr;
+ mParent = nullptr;
+}
+
+} // dom namespace
+} // mozilla namespace \ No newline at end of file
diff --git a/dom/script/ModuleLoadRequest.h b/dom/script/ModuleLoadRequest.h
new file mode 100644
index 000000000..7b06dd2cf
--- /dev/null
+++ b/dom/script/ModuleLoadRequest.h
@@ -0,0 +1,87 @@
+/* -*- 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_ModuleLoadRequest_h
+#define mozilla_dom_ModuleLoadRequest_h
+
+#include "mozilla/dom/ScriptLoader.h"
+#include "mozilla/MozPromise.h"
+
+namespace mozilla {
+namespace dom {
+
+class ModuleScript;
+class ScriptLoader;
+
+// A load request for a module, created for every top level module script and
+// every module import. Load request can share a ModuleScript if there are
+// multiple imports of the same module.
+
+class ModuleLoadRequest final : public ScriptLoadRequest
+{
+ ~ModuleLoadRequest() {}
+
+ ModuleLoadRequest(const ModuleLoadRequest& aOther) = delete;
+ ModuleLoadRequest(ModuleLoadRequest&& aOther) = delete;
+
+public:
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ModuleLoadRequest, ScriptLoadRequest)
+
+ ModuleLoadRequest(nsIScriptElement* aElement,
+ uint32_t aVersion,
+ CORSMode aCORSMode,
+ const SRIMetadata& aIntegrity,
+ ScriptLoader* aLoader);
+
+ bool IsTopLevel() const {
+ return mIsTopLevel;
+ }
+
+ void SetReady() override;
+ void Cancel() override;
+
+ void ModuleLoaded();
+ void ModuleErrored();
+ void DependenciesLoaded();
+ void LoadFailed();
+
+private:
+ void LoadFinished();
+ void CancelImports();
+
+public:
+ // Is this a request for a top level module script or an import?
+ bool mIsTopLevel;
+
+ // The base URL used for resolving relative module imports.
+ nsCOMPtr<nsIURI> mBaseURL;
+
+ // Pointer to the script loader, used to trigger actions when the module load
+ // finishes.
+ RefPtr<ScriptLoader> mLoader;
+
+ // The importing module, or nullptr for top level module scripts. Used to
+ // implement the ancestor list checked when fetching module dependencies.
+ RefPtr<ModuleLoadRequest> mParent;
+
+ // Set to a module script object after a successful load or nullptr on
+ // failure.
+ RefPtr<ModuleScript> mModuleScript;
+
+ // A promise that is completed on successful load of this module and all of
+ // its dependencies, indicating that the module is ready for instantiation and
+ // evaluation.
+ MozPromiseHolder<GenericPromise> mReady;
+
+ // Array of imported modules.
+ nsTArray<RefPtr<ModuleLoadRequest>> mImports;
+};
+
+} // dom namespace
+} // mozilla namespace
+
+#endif // mozilla_dom_ModuleLoadRequest_h \ No newline at end of file
diff --git a/dom/script/ModuleScript.cpp b/dom/script/ModuleScript.cpp
new file mode 100644
index 000000000..28b97a3cb
--- /dev/null
+++ b/dom/script/ModuleScript.cpp
@@ -0,0 +1,122 @@
+/* -*- 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/. */
+
+/*
+ * A class that handles loading and evaluation of <script> elements.
+ */
+
+#include "ModuleScript.h"
+#include "mozilla/HoldDropJSObjects.h"
+#include "ScriptLoader.h"
+
+namespace mozilla {
+namespace dom {
+
+// A single module script. May be used to satisfy multiple load requests.
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ModuleScript)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(ModuleScript)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ModuleScript)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoader)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
+ tmp->UnlinkModuleRecord();
+ tmp->mError.setUndefined();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ModuleScript)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoader)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ModuleScript)
+ NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
+ NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mError)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(ModuleScript)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(ModuleScript)
+
+ModuleScript::ModuleScript(ScriptLoader *aLoader, nsIURI* aBaseURL)
+ : mLoader(aLoader),
+ mBaseURL(aBaseURL)
+{
+ MOZ_ASSERT(mLoader);
+ MOZ_ASSERT(mBaseURL);
+ MOZ_ASSERT(!mModuleRecord);
+ MOZ_ASSERT(mError.isUndefined());
+}
+
+void
+ModuleScript::UnlinkModuleRecord()
+{
+ // Remove module's back reference to this object request if present.
+ if (mModuleRecord) {
+ MOZ_ASSERT(JS::GetModuleHostDefinedField(mModuleRecord).toPrivate() ==
+ this);
+ JS::SetModuleHostDefinedField(mModuleRecord, JS::UndefinedValue());
+ mModuleRecord = nullptr;
+ }
+}
+
+ModuleScript::~ModuleScript()
+{
+ // The object may be destroyed without being unlinked first.
+ UnlinkModuleRecord();
+ DropJSObjects(this);
+}
+
+void
+ModuleScript::SetModuleRecord(JS::Handle<JSObject*> aModuleRecord)
+{
+ MOZ_ASSERT(!mModuleRecord);
+ MOZ_ASSERT(mError.isUndefined());
+
+ mModuleRecord = aModuleRecord;
+
+ // Make module's host defined field point to this module script object.
+ // This is cleared in the UnlinkModuleRecord().
+ JS::SetModuleHostDefinedField(mModuleRecord, JS::PrivateValue(this));
+ HoldJSObjects(this);
+}
+
+void
+ModuleScript::SetPreInstantiationError(const JS::Value& aError)
+{
+ MOZ_ASSERT(!aError.isUndefined());
+
+ UnlinkModuleRecord();
+ mError = aError;
+
+ HoldJSObjects(this);
+}
+
+bool
+ModuleScript::IsErrored() const
+{
+ if (!mModuleRecord) {
+ MOZ_ASSERT(!mError.isUndefined());
+ return true;
+ }
+
+ return JS::IsModuleErrored(mModuleRecord);
+}
+
+JS::Value
+ModuleScript::Error() const
+{
+ MOZ_ASSERT(IsErrored());
+
+ if (!mModuleRecord) {
+ return mError;
+ }
+
+ return JS::GetModuleError(mModuleRecord);
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/script/ModuleScript.h b/dom/script/ModuleScript.h
new file mode 100644
index 000000000..571359859
--- /dev/null
+++ b/dom/script/ModuleScript.h
@@ -0,0 +1,53 @@
+/* -*- 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_ModuleScript_h
+#define mozilla_dom_ModuleScript_h
+
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "jsapi.h"
+
+class nsIURI;
+
+namespace mozilla {
+namespace dom {
+
+class ScriptLoader;
+
+class ModuleScript final : public nsISupports
+{
+ RefPtr<ScriptLoader> mLoader;
+ nsCOMPtr<nsIURI> mBaseURL;
+ JS::Heap<JSObject*> mModuleRecord;
+ JS::Heap<JS::Value> mError;
+
+ ~ModuleScript();
+
+public:
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(ModuleScript)
+
+ ModuleScript(ScriptLoader* aLoader,
+ nsIURI* aBaseURL);
+
+ void SetModuleRecord(JS::Handle<JSObject*> aModuleRecord);
+ void SetPreInstantiationError(const JS::Value& aError);
+
+ ScriptLoader* Loader() const { return mLoader; }
+ JSObject* ModuleRecord() const { return mModuleRecord; }
+ nsIURI* BaseURL() const { return mBaseURL; }
+
+ bool IsErrored() const;
+ JS::Value Error() const;
+
+ void UnlinkModuleRecord();
+};
+
+} // dom namespace
+} // mozilla namespace
+
+#endif // mozilla_dom_ModuleScript_h \ No newline at end of file
diff --git a/dom/script/ScriptElement.cpp b/dom/script/ScriptElement.cpp
new file mode 100644
index 000000000..0cb17dcb0
--- /dev/null
+++ b/dom/script/ScriptElement.cpp
@@ -0,0 +1,150 @@
+/* -*- 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/. */
+
+#include "ScriptElement.h"
+#include "ScriptLoader.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/dom/Element.h"
+#include "nsContentUtils.h"
+#include "nsPresContext.h"
+#include "nsIParser.h"
+#include "nsGkAtoms.h"
+#include "nsContentSink.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+NS_IMETHODIMP
+ScriptElement::ScriptAvailable(nsresult aResult,
+ nsIScriptElement *aElement,
+ bool aIsInline,
+ nsIURI *aURI,
+ int32_t aLineNo)
+{
+ if (!aIsInline && NS_FAILED(aResult)) {
+ nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
+ if (parser) {
+ parser->PushDefinedInsertionPoint();
+ }
+ nsresult rv = FireErrorEvent();
+ if (parser) {
+ parser->PopDefinedInsertionPoint();
+ }
+ return rv;
+ }
+ return NS_OK;
+}
+
+/* virtual */ nsresult
+ScriptElement::FireErrorEvent()
+{
+ nsCOMPtr<nsIContent> cont =
+ do_QueryInterface((nsIScriptElement*) this);
+
+ return nsContentUtils::DispatchTrustedEvent(cont->OwnerDoc(),
+ cont,
+ NS_LITERAL_STRING("error"),
+ false /* bubbles */,
+ false /* cancelable */);
+}
+
+NS_IMETHODIMP
+ScriptElement::ScriptEvaluated(nsresult aResult,
+ nsIScriptElement *aElement,
+ bool aIsInline)
+{
+ nsresult rv = NS_OK;
+ if (!aIsInline) {
+ nsCOMPtr<nsIContent> cont =
+ do_QueryInterface((nsIScriptElement*) this);
+
+ RefPtr<nsPresContext> presContext =
+ nsContentUtils::GetContextForContent(cont);
+
+ nsEventStatus status = nsEventStatus_eIgnore;
+ EventMessage message = NS_SUCCEEDED(aResult) ? eLoad : eLoadError;
+ WidgetEvent event(true, message);
+ // Load event doesn't bubble.
+ event.mFlags.mBubbles = (message != eLoad);
+
+ EventDispatcher::Dispatch(cont, presContext, &event, nullptr, &status);
+ }
+
+ return rv;
+}
+
+void
+ScriptElement::CharacterDataChanged(nsIDocument *aDocument,
+ nsIContent* aContent,
+ CharacterDataChangeInfo* aInfo)
+{
+ MaybeProcessScript();
+}
+
+void
+ScriptElement::AttributeChanged(nsIDocument* aDocument,
+ Element* aElement,
+ int32_t aNameSpaceID,
+ nsIAtom* aAttribute,
+ int32_t aModType,
+ const nsAttrValue* aOldValue)
+{
+ MaybeProcessScript();
+}
+
+void
+ScriptElement::ContentAppended(nsIDocument* aDocument,
+ nsIContent* aContainer,
+ nsIContent* aFirstNewContent,
+ int32_t aNewIndexInContainer)
+{
+ MaybeProcessScript();
+}
+
+void
+ScriptElement::ContentInserted(nsIDocument *aDocument,
+ nsIContent* aContainer,
+ nsIContent* aChild,
+ int32_t aIndexInContainer)
+{
+ MaybeProcessScript();
+}
+
+bool
+ScriptElement::MaybeProcessScript()
+{
+ nsCOMPtr<nsIContent> cont =
+ do_QueryInterface((nsIScriptElement*) this);
+
+ NS_ASSERTION(cont->DebugGetSlots()->mMutationObservers.Contains(this),
+ "You forgot to add self as observer");
+
+ if (mAlreadyStarted || !mDoneAddingChildren ||
+ !cont->GetComposedDoc() || mMalformed || !HasScriptContent()) {
+ return false;
+ }
+
+ FreezeUriAsyncDefer();
+
+ mAlreadyStarted = true;
+
+ nsIDocument* ownerDoc = cont->OwnerDoc();
+ nsCOMPtr<nsIParser> parser = ((nsIScriptElement*) this)->GetCreatorParser();
+ if (parser) {
+ nsCOMPtr<nsIContentSink> sink = parser->GetContentSink();
+ if (sink) {
+ nsCOMPtr<nsIDocument> parserDoc = do_QueryInterface(sink->GetTarget());
+ if (ownerDoc != parserDoc) {
+ // Willful violation of HTML5 as of 2010-12-01
+ return false;
+ }
+ }
+ }
+
+ RefPtr<ScriptLoader> loader = ownerDoc->ScriptLoader();
+ return loader->ProcessScriptElement(this);
+}
diff --git a/dom/script/ScriptElement.h b/dom/script/ScriptElement.h
new file mode 100644
index 000000000..0babda674
--- /dev/null
+++ b/dom/script/ScriptElement.h
@@ -0,0 +1,58 @@
+/* -*- 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_ScriptElement_h
+#define mozilla_dom_ScriptElement_h
+
+#include "mozilla/Attributes.h"
+#include "nsIScriptLoaderObserver.h"
+#include "nsIScriptElement.h"
+#include "nsStubMutationObserver.h"
+
+namespace mozilla {
+namespace dom {
+
+/**
+ * Baseclass useful for script elements (such as <xhtml:script> and
+ * <svg:script>). Currently the class assumes that only the 'src'
+ * attribute and the children of the class affect what script to execute.
+ */
+
+class ScriptElement : public nsIScriptElement,
+ public nsStubMutationObserver
+{
+public:
+ // nsIScriptLoaderObserver
+ NS_DECL_NSISCRIPTLOADEROBSERVER
+
+ // nsIMutationObserver
+ NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+ NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+
+ explicit ScriptElement(FromParser aFromParser)
+ : nsIScriptElement(aFromParser)
+ {
+ }
+
+ virtual nsresult FireErrorEvent() override;
+
+protected:
+ // Internal methods
+
+ /**
+ * Check if this element contains any script, linked or inline
+ */
+ virtual bool HasScriptContent() = 0;
+
+ virtual bool MaybeProcessScript() override;
+};
+
+} // dom namespace
+} // mozilla namespace
+
+#endif // mozilla_dom_ScriptElement_h
diff --git a/dom/script/ScriptLoadHandler.cpp b/dom/script/ScriptLoadHandler.cpp
new file mode 100644
index 000000000..80fb70f6a
--- /dev/null
+++ b/dom/script/ScriptLoadHandler.cpp
@@ -0,0 +1,216 @@
+/* -*- 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/. */
+
+/*
+ * A class that handles loading and evaluation of <script> elements.
+ */
+
+#include "ScriptLoadHandler.h"
+#include "ScriptLoader.h"
+#include "nsContentUtils.h"
+
+#include "mozilla/dom/EncodingUtils.h"
+
+namespace mozilla {
+namespace dom {
+
+ScriptLoadHandler::ScriptLoadHandler(ScriptLoader *aScriptLoader,
+ ScriptLoadRequest *aRequest,
+ mozilla::dom::SRICheckDataVerifier *aSRIDataVerifier)
+ : mScriptLoader(aScriptLoader),
+ mRequest(aRequest),
+ mSRIDataVerifier(aSRIDataVerifier),
+ mSRIStatus(NS_OK),
+ mDecoder(),
+ mBuffer()
+{}
+
+ScriptLoadHandler::~ScriptLoadHandler()
+{}
+
+NS_IMPL_ISUPPORTS(ScriptLoadHandler, nsIIncrementalStreamLoaderObserver)
+
+NS_IMETHODIMP
+ScriptLoadHandler::OnIncrementalData(nsIIncrementalStreamLoader* aLoader,
+ nsISupports* aContext,
+ uint32_t aDataLength,
+ const uint8_t* aData,
+ uint32_t *aConsumedLength)
+{
+ if (mRequest->IsCanceled()) {
+ // If request cancelled, ignore any incoming data.
+ *aConsumedLength = aDataLength;
+ return NS_OK;
+ }
+
+ if (!EnsureDecoder(aLoader, aData, aDataLength,
+ /* aEndOfStream = */ false)) {
+ return NS_OK;
+ }
+
+ // Below we will/shall consume entire data chunk.
+ *aConsumedLength = aDataLength;
+
+ // Decoder has already been initialized. -- trying to decode all loaded bytes.
+ nsresult rv = TryDecodeRawData(aData, aDataLength,
+ /* aEndOfStream = */ false);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ // If SRI is required for this load, appending new bytes to the hash.
+ if (mSRIDataVerifier && NS_SUCCEEDED(mSRIStatus)) {
+ mSRIStatus = mSRIDataVerifier->Update(aDataLength, aData);
+ }
+
+ return rv;
+}
+
+nsresult
+ScriptLoadHandler::TryDecodeRawData(const uint8_t* aData,
+ uint32_t aDataLength,
+ bool aEndOfStream)
+{
+ int32_t srcLen = aDataLength;
+ const char* src = reinterpret_cast<const char *>(aData);
+ int32_t dstLen;
+ nsresult rv =
+ mDecoder->GetMaxLength(src, srcLen, &dstLen);
+
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ uint32_t haveRead = mBuffer.length();
+
+ CheckedInt<uint32_t> capacity = haveRead;
+ capacity += dstLen;
+
+ if (!capacity.isValid() || !mBuffer.reserve(capacity.value())) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ rv = mDecoder->Convert(src,
+ &srcLen,
+ mBuffer.begin() + haveRead,
+ &dstLen);
+
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ haveRead += dstLen;
+ MOZ_ASSERT(haveRead <= capacity.value(), "mDecoder produced more data than expected");
+ MOZ_ALWAYS_TRUE(mBuffer.resizeUninitialized(haveRead));
+
+ return NS_OK;
+}
+
+bool
+ScriptLoadHandler::EnsureDecoder(nsIIncrementalStreamLoader *aLoader,
+ const uint8_t* aData,
+ uint32_t aDataLength,
+ bool aEndOfStream)
+{
+ // Check if decoder has already been created.
+ if (mDecoder) {
+ return true;
+ }
+
+ nsAutoCString charset;
+
+ // JavaScript modules are always UTF-8.
+ if (mRequest->IsModuleRequest()) {
+ charset = "UTF-8";
+ mDecoder = EncodingUtils::DecoderForEncoding(charset);
+ return true;
+ }
+
+ // Determine if BOM check should be done. This occurs either
+ // if end-of-stream has been reached, or at least 3 bytes have
+ // been read from input.
+ if (!aEndOfStream && (aDataLength < 3)) {
+ return false;
+ }
+
+ // Do BOM detection.
+ if (nsContentUtils::CheckForBOM(aData, aDataLength, charset)) {
+ mDecoder = EncodingUtils::DecoderForEncoding(charset);
+ return true;
+ }
+
+ // BOM detection failed, check content stream for charset.
+ nsCOMPtr<nsIRequest> req;
+ nsresult rv = aLoader->GetRequest(getter_AddRefs(req));
+ NS_ASSERTION(req, "StreamLoader's request went away prematurely");
+ NS_ENSURE_SUCCESS(rv, false);
+
+ nsCOMPtr<nsIChannel> channel = do_QueryInterface(req);
+
+ if (channel &&
+ NS_SUCCEEDED(channel->GetContentCharset(charset)) &&
+ EncodingUtils::FindEncodingForLabel(charset, charset)) {
+ mDecoder = EncodingUtils::DecoderForEncoding(charset);
+ return true;
+ }
+
+ // Check the hint charset from the script element or preload
+ // request.
+ nsAutoString hintCharset;
+ if (!mRequest->IsPreload()) {
+ mRequest->mElement->GetScriptCharset(hintCharset);
+ } else {
+ nsTArray<ScriptLoader::PreloadInfo>::index_type i =
+ mScriptLoader->mPreloads.IndexOf(mRequest, 0,
+ ScriptLoader::PreloadRequestComparator());
+
+ NS_ASSERTION(i != mScriptLoader->mPreloads.NoIndex,
+ "Incorrect preload bookkeeping");
+ hintCharset = mScriptLoader->mPreloads[i].mCharset;
+ }
+
+ if (EncodingUtils::FindEncodingForLabel(hintCharset, charset)) {
+ mDecoder = EncodingUtils::DecoderForEncoding(charset);
+ return true;
+ }
+
+ // Get the charset from the charset of the document.
+ if (mScriptLoader->mDocument) {
+ charset = mScriptLoader->mDocument->GetDocumentCharacterSet();
+ mDecoder = EncodingUtils::DecoderForEncoding(charset);
+ return true;
+ }
+
+ // Curiously, there are various callers that don't pass aDocument. The
+ // fallback in the old code was ISO-8859-1, which behaved like
+ // windows-1252. Saying windows-1252 for clarity and for compliance
+ // with the Encoding Standard.
+ charset = "windows-1252";
+ mDecoder = EncodingUtils::DecoderForEncoding(charset);
+ return true;
+}
+
+NS_IMETHODIMP
+ScriptLoadHandler::OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
+ nsISupports* aContext,
+ nsresult aStatus,
+ uint32_t aDataLength,
+ const uint8_t* aData)
+{
+ if (!mRequest->IsCanceled()) {
+ DebugOnly<bool> encoderSet =
+ EnsureDecoder(aLoader, aData, aDataLength, /* aEndOfStream = */ true);
+ MOZ_ASSERT(encoderSet);
+ DebugOnly<nsresult> rv = TryDecodeRawData(aData, aDataLength,
+ /* aEndOfStream = */ true);
+
+ // If SRI is required for this load, appending new bytes to the hash.
+ if (mSRIDataVerifier && NS_SUCCEEDED(mSRIStatus)) {
+ mSRIStatus = mSRIDataVerifier->Update(aDataLength, aData);
+ }
+ }
+
+ // we have to mediate and use mRequest.
+ return mScriptLoader->OnStreamComplete(aLoader, mRequest, aStatus, mSRIStatus,
+ mBuffer, mSRIDataVerifier);
+}
+
+} // dom namespace
+} // mozilla namespace \ No newline at end of file
diff --git a/dom/script/ScriptLoadHandler.h b/dom/script/ScriptLoadHandler.h
new file mode 100644
index 000000000..b70f87397
--- /dev/null
+++ b/dom/script/ScriptLoadHandler.h
@@ -0,0 +1,76 @@
+/* -*- 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/. */
+
+/*
+ * A class that handles loading and evaluation of <script> elements.
+ */
+
+#ifndef mozilla_dom_ScriptLoadHandler_h
+#define mozilla_dom_ScriptLoadHandler_h
+
+#include "nsIIncrementalStreamLoader.h"
+#include "nsIUnicodeDecoder.h"
+#include "nsAutoPtr.h"
+#include "mozilla/Vector.h"
+
+namespace mozilla {
+namespace dom {
+
+class ScriptLoadRequest;
+class ScriptLoader;
+class SRICheckDataVerifier;
+
+class ScriptLoadHandler final : public nsIIncrementalStreamLoaderObserver
+{
+public:
+ explicit ScriptLoadHandler(ScriptLoader* aScriptLoader,
+ ScriptLoadRequest* aRequest,
+ SRICheckDataVerifier* aSRIDataVerifier);
+
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIINCREMENTALSTREAMLOADEROBSERVER
+
+private:
+ virtual ~ScriptLoadHandler();
+
+ /*
+ * Try to decode some raw data.
+ */
+ nsresult TryDecodeRawData(const uint8_t* aData, uint32_t aDataLength,
+ bool aEndOfStream);
+
+ /*
+ * Discover the charset by looking at the stream data, the script
+ * tag, and other indicators. Returns true if charset has been
+ * discovered.
+ */
+ bool EnsureDecoder(nsIIncrementalStreamLoader *aLoader,
+ const uint8_t* aData, uint32_t aDataLength,
+ bool aEndOfStream);
+
+ // ScriptLoader which will handle the parsed script.
+ RefPtr<ScriptLoader> mScriptLoader;
+
+ // The ScriptLoadRequest for this load.
+ RefPtr<ScriptLoadRequest> mRequest;
+
+ // SRI data verifier.
+ nsAutoPtr<SRICheckDataVerifier> mSRIDataVerifier;
+
+ // Status of SRI data operations.
+ nsresult mSRIStatus;
+
+ // Unicode decoder for charset.
+ nsCOMPtr<nsIUnicodeDecoder> mDecoder;
+
+ // Accumulated decoded char buffer.
+ mozilla::Vector<char16_t> mBuffer;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif //mozilla_dom_ScriptLoader_h
diff --git a/dom/script/ScriptLoader.cpp b/dom/script/ScriptLoader.cpp
new file mode 100644
index 000000000..a53098974
--- /dev/null
+++ b/dom/script/ScriptLoader.cpp
@@ -0,0 +1,2622 @@
+/* -*- 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/. */
+
+#include "ScriptLoader.h"
+#include "ScriptLoadHandler.h"
+#include "ModuleLoadRequest.h"
+#include "ModuleScript.h"
+
+#include "prsystem.h"
+#include "jsapi.h"
+#include "jsfriendapi.h"
+#include "xpcpublic.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIContent.h"
+#include "nsJSUtils.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/SRILogHelper.h"
+#include "nsGkAtoms.h"
+#include "nsNetUtil.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsIScriptContext.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsIPrincipal.h"
+#include "nsJSPrincipals.h"
+#include "nsContentPolicyUtils.h"
+#include "nsIHttpChannel.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsIClassOfService.h"
+#include "nsITimedChannel.h"
+#include "nsIScriptElement.h"
+#include "nsIDOMHTMLScriptElement.h"
+#include "nsIDocShell.h"
+#include "nsContentUtils.h"
+#include "nsUnicharUtils.h"
+#include "nsAutoPtr.h"
+#include "nsIXPConnect.h"
+#include "nsError.h"
+#include "nsThreadUtils.h"
+#include "nsDocShellCID.h"
+#include "nsIContentSecurityPolicy.h"
+#include "mozilla/Logging.h"
+#include "nsCRT.h"
+#include "nsContentCreatorFunctions.h"
+#include "nsProxyRelease.h"
+#include "nsSandboxFlags.h"
+#include "nsContentTypeParser.h"
+#include "nsINetworkPredictor.h"
+#include "ImportManager.h"
+#include "mozilla/dom/EncodingUtils.h"
+#include "mozilla/ConsoleReportCollector.h"
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Unused.h"
+#include "nsIScriptError.h"
+
+using JS::SourceBufferHolder;
+
+namespace mozilla {
+namespace dom {
+
+static LazyLogModule gCspPRLog("CSP");
+
+void
+ImplCycleCollectionUnlink(ScriptLoadRequestList& aField);
+
+void
+ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
+ ScriptLoadRequestList& aField,
+ const char* aName,
+ uint32_t aFlags = 0);
+
+//////////////////////////////////////////////////////////////
+// nsScriptLoadRequest
+//////////////////////////////////////////////////////////////
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ScriptLoadRequest)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(ScriptLoadRequest)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(ScriptLoadRequest)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(ScriptLoadRequest)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ScriptLoadRequest)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mElement)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ScriptLoadRequest)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+ScriptLoadRequest::~ScriptLoadRequest()
+{
+ js_free(mScriptTextBuf);
+
+ // We should always clean up any off-thread script parsing resources.
+ MOZ_ASSERT(!mOffThreadToken);
+
+ // But play it safe in release builds and try to clean them up here
+ // as a fail safe.
+ MaybeCancelOffThreadScript();
+}
+
+void
+ScriptLoadRequest::SetReady()
+{
+ MOZ_ASSERT(mProgress != Progress::Ready);
+ mProgress = Progress::Ready;
+}
+
+void
+ScriptLoadRequest::Cancel()
+{
+ MaybeCancelOffThreadScript();
+ mIsCanceled = true;
+}
+
+void
+ScriptLoadRequest::MaybeCancelOffThreadScript()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (!mOffThreadToken) {
+ return;
+ }
+
+ JSContext* cx = danger::GetJSContext();
+ JS::CancelOffThreadScript(cx, mOffThreadToken);
+ mOffThreadToken = nullptr;
+}
+
+inline ModuleLoadRequest*
+ScriptLoadRequest::AsModuleRequest()
+{
+ MOZ_ASSERT(IsModuleRequest());
+ return static_cast<ModuleLoadRequest*>(this);
+}
+
+//////////////////////////////////////////////////////////////
+
+// ScriptLoadRequestList
+//////////////////////////////////////////////////////////////
+
+ScriptLoadRequestList::~ScriptLoadRequestList()
+{
+ Clear();
+}
+
+void
+ScriptLoadRequestList::Clear()
+{
+ while (!isEmpty()) {
+ RefPtr<ScriptLoadRequest> first = StealFirst();
+ first->Cancel();
+ // And just let it go out of scope and die.
+ }
+}
+
+#ifdef DEBUG
+bool
+ScriptLoadRequestList::Contains(ScriptLoadRequest* aElem) const
+{
+ for (const ScriptLoadRequest* req = getFirst();
+ req; req = req->getNext()) {
+ if (req == aElem) {
+ return true;
+ }
+ }
+
+ return false;
+}
+#endif // DEBUG
+
+inline void
+ImplCycleCollectionUnlink(ScriptLoadRequestList& aField)
+{
+ while (!aField.isEmpty()) {
+ RefPtr<ScriptLoadRequest> first = aField.StealFirst();
+ }
+}
+
+inline void
+ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
+ ScriptLoadRequestList& aField,
+ const char* aName,
+ uint32_t aFlags)
+{
+ for (ScriptLoadRequest* request = aField.getFirst();
+ request; request = request->getNext())
+ {
+ CycleCollectionNoteChild(aCallback, request, aName, aFlags);
+ }
+}
+
+//////////////////////////////////////////////////////////////
+// ScriptLoader::PreloadInfo
+//////////////////////////////////////////////////////////////
+
+inline void
+ImplCycleCollectionUnlink(ScriptLoader::PreloadInfo& aField)
+{
+ ImplCycleCollectionUnlink(aField.mRequest);
+}
+
+inline void
+ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
+ ScriptLoader::PreloadInfo& aField,
+ const char* aName,
+ uint32_t aFlags = 0)
+{
+ ImplCycleCollectionTraverse(aCallback, aField.mRequest, aName, aFlags);
+}
+
+//////////////////////////////////////////////////////////////
+// ScriptLoader
+//////////////////////////////////////////////////////////////
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ScriptLoader)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION(ScriptLoader,
+ mNonAsyncExternalScriptInsertedRequests,
+ mLoadingAsyncRequests,
+ mLoadedAsyncRequests,
+ mDeferRequests,
+ mXSLTRequests,
+ mParserBlockingRequest,
+ mPreloads,
+ mPendingChildLoaders,
+ mFetchedModules)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(ScriptLoader)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(ScriptLoader)
+
+ScriptLoader::ScriptLoader(nsIDocument *aDocument)
+ : mDocument(aDocument),
+ mParserBlockingBlockerCount(0),
+ mBlockerCount(0),
+ mNumberOfProcessors(0),
+ mEnabled(true),
+ mDeferEnabled(false),
+ mDocumentParsingDone(false),
+ mBlockingDOMContentLoaded(false),
+ mReporter(new ConsoleReportCollector())
+{
+}
+
+ScriptLoader::~ScriptLoader()
+{
+ mObservers.Clear();
+
+ if (mParserBlockingRequest) {
+ mParserBlockingRequest->FireScriptAvailable(NS_ERROR_ABORT);
+ }
+
+ for (ScriptLoadRequest* req = mXSLTRequests.getFirst(); req;
+ req = req->getNext()) {
+ req->FireScriptAvailable(NS_ERROR_ABORT);
+ }
+
+ for (ScriptLoadRequest* req = mDeferRequests.getFirst(); req;
+ req = req->getNext()) {
+ req->FireScriptAvailable(NS_ERROR_ABORT);
+ }
+
+ for (ScriptLoadRequest* req = mLoadingAsyncRequests.getFirst(); req;
+ req = req->getNext()) {
+ req->FireScriptAvailable(NS_ERROR_ABORT);
+ }
+
+ for (ScriptLoadRequest* req = mLoadedAsyncRequests.getFirst(); req;
+ req = req->getNext()) {
+ req->FireScriptAvailable(NS_ERROR_ABORT);
+ }
+
+ for(ScriptLoadRequest* req = mNonAsyncExternalScriptInsertedRequests.getFirst();
+ req;
+ req = req->getNext()) {
+ req->FireScriptAvailable(NS_ERROR_ABORT);
+ }
+
+ // Unblock the kids, in case any of them moved to a different document
+ // subtree in the meantime and therefore aren't actually going away.
+ for (uint32_t j = 0; j < mPendingChildLoaders.Length(); ++j) {
+ mPendingChildLoaders[j]->RemoveParserBlockingScriptExecutionBlocker();
+ }
+}
+
+// Helper method for checking if the script element is an event-handler
+// This means that it has both a for-attribute and a event-attribute.
+// Also, if the for-attribute has a value that matches "\s*window\s*",
+// and the event-attribute matches "\s*onload([ \(].*)?" then it isn't an
+// eventhandler. (both matches are case insensitive).
+// This is how IE seems to filter out a window's onload handler from a
+// <script for=... event=...> element.
+
+static bool
+IsScriptEventHandler(nsIContent* aScriptElement)
+{
+ if (!aScriptElement->IsHTMLElement()) {
+ return false;
+ }
+
+ nsAutoString forAttr, eventAttr;
+ if (!aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::_for, forAttr) ||
+ !aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::event, eventAttr)) {
+ return false;
+ }
+
+ const nsAString& for_str =
+ nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(forAttr);
+ if (!for_str.LowerCaseEqualsLiteral("window")) {
+ return true;
+ }
+
+ // We found for="window", now check for event="onload".
+ const nsAString& event_str =
+ nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(eventAttr, false);
+ if (!StringBeginsWith(event_str, NS_LITERAL_STRING("onload"),
+ nsCaseInsensitiveStringComparator())) {
+ // It ain't "onload.*".
+
+ return true;
+ }
+
+ nsAutoString::const_iterator start, end;
+ event_str.BeginReading(start);
+ event_str.EndReading(end);
+
+ start.advance(6); // advance past "onload"
+
+ if (start != end && *start != '(' && *start != ' ') {
+ // We got onload followed by something other than space or
+ // '('. Not good enough.
+
+ return true;
+ }
+
+ return false;
+}
+
+nsresult
+ScriptLoader::CheckContentPolicy(nsIDocument* aDocument,
+ nsISupports *aContext,
+ nsIURI *aURI,
+ const nsAString &aType,
+ bool aIsPreLoad)
+{
+ nsContentPolicyType contentPolicyType = aIsPreLoad
+ ? nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD
+ : nsIContentPolicy::TYPE_INTERNAL_SCRIPT;
+
+ int16_t shouldLoad = nsIContentPolicy::ACCEPT;
+ nsresult rv = NS_CheckContentLoadPolicy(contentPolicyType,
+ aURI,
+ aDocument->NodePrincipal(),
+ aContext,
+ NS_LossyConvertUTF16toASCII(aType),
+ nullptr, //extra
+ &shouldLoad,
+ nsContentUtils::GetContentPolicy(),
+ nsContentUtils::GetSecurityManager());
+ if (NS_FAILED(rv) || NS_CP_REJECTED(shouldLoad)) {
+ if (NS_FAILED(rv) || shouldLoad != nsIContentPolicy::REJECT_TYPE) {
+ return NS_ERROR_CONTENT_BLOCKED;
+ }
+ return NS_ERROR_CONTENT_BLOCKED_SHOW_ALT;
+ }
+
+ return NS_OK;
+}
+
+bool
+ScriptLoader::ModuleScriptsEnabled()
+{
+ static bool sEnabledForContent = false;
+ static bool sCachedPref = false;
+ if (!sCachedPref) {
+ sCachedPref = true;
+ Preferences::AddBoolVarCache(&sEnabledForContent, "dom.moduleScripts.enabled", false);
+ }
+
+ return nsContentUtils::IsChromeDoc(mDocument) || sEnabledForContent;
+}
+
+bool
+ScriptLoader::ModuleMapContainsModule(ModuleLoadRequest *aRequest) const
+{
+ // Returns whether we have fetched, or are currently fetching, a module script
+ // for the request's URL.
+ return mFetchingModules.Contains(aRequest->mURI) ||
+ mFetchedModules.Contains(aRequest->mURI);
+}
+
+bool
+ScriptLoader::IsFetchingModule(ModuleLoadRequest *aRequest) const
+{
+ bool fetching = mFetchingModules.Contains(aRequest->mURI);
+ MOZ_ASSERT_IF(fetching, !mFetchedModules.Contains(aRequest->mURI));
+ return fetching;
+}
+
+void
+ScriptLoader::SetModuleFetchStarted(ModuleLoadRequest *aRequest)
+{
+ // Update the module map to indicate that a module is currently being fetched.
+
+ MOZ_ASSERT(aRequest->IsLoading());
+ MOZ_ASSERT(!ModuleMapContainsModule(aRequest));
+ mFetchingModules.Put(aRequest->mURI, nullptr);
+}
+
+void
+ScriptLoader::SetModuleFetchFinishedAndResumeWaitingRequests(ModuleLoadRequest *aRequest,
+ nsresult aResult)
+{
+ // Update module map with the result of fetching a single module script.
+ //
+ // If any requests for the same URL are waiting on this one to complete, they
+ // will have ModuleLoaded or LoadFailed on them when the promise is
+ // resolved/rejected. This is set up in StartLoad.
+
+ RefPtr<GenericPromise::Private> promise;
+ MOZ_ALWAYS_TRUE(mFetchingModules.Get(aRequest->mURI, getter_AddRefs(promise)));
+ mFetchingModules.Remove(aRequest->mURI);
+
+ RefPtr<ModuleScript> moduleScript(aRequest->mModuleScript);
+ MOZ_ASSERT(NS_FAILED(aResult) == !moduleScript);
+
+ mFetchedModules.Put(aRequest->mURI, moduleScript);
+
+ if (promise) {
+ if (moduleScript) {
+ promise->Resolve(true, __func__);
+ } else {
+ promise->Reject(aResult, __func__);
+ }
+ }
+}
+
+RefPtr<GenericPromise>
+ScriptLoader::WaitForModuleFetch(ModuleLoadRequest *aRequest)
+{
+ MOZ_ASSERT(ModuleMapContainsModule(aRequest));
+
+ RefPtr<GenericPromise::Private> promise;
+ if (mFetchingModules.Get(aRequest->mURI, getter_AddRefs(promise))) {
+ if (!promise) {
+ promise = new GenericPromise::Private(__func__);
+ mFetchingModules.Put(aRequest->mURI, promise);
+ }
+ return promise;
+ }
+
+ RefPtr<ModuleScript> ms;
+ MOZ_ALWAYS_TRUE(mFetchedModules.Get(aRequest->mURI, getter_AddRefs(ms)));
+ if (!ms) {
+ return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+ }
+
+ return GenericPromise::CreateAndResolve(true, __func__);
+}
+
+ModuleScript*
+ScriptLoader::GetFetchedModule(nsIURI* aURL) const
+{
+ bool found;
+ ModuleScript* ms = mFetchedModules.GetWeak(aURL, &found);
+ MOZ_ASSERT(found);
+ return ms;
+}
+
+nsresult
+ScriptLoader::ProcessFetchedModuleSource(ModuleLoadRequest* aRequest)
+{
+ MOZ_ASSERT(!aRequest->mModuleScript);
+
+ nsresult rv = CreateModuleScript(aRequest);
+ MOZ_ASSERT(NS_FAILED(rv) == !aRequest->mModuleScript);
+
+ SetModuleFetchFinishedAndResumeWaitingRequests(aRequest, rv);
+
+ free(aRequest->mScriptTextBuf);
+ aRequest->mScriptTextBuf = nullptr;
+ aRequest->mScriptTextLength = 0;
+
+ if (NS_FAILED(rv)) {
+ aRequest->LoadFailed();
+ return rv;
+ }
+
+ if (!aRequest->mModuleScript->IsErrored()) {
+ StartFetchingModuleDependencies(aRequest);
+ }
+
+ return NS_OK;
+}
+
+static nsresult
+ResolveRequestedModules(ModuleLoadRequest* aRequest, nsCOMArray<nsIURI>& aUrls);
+
+nsresult
+ScriptLoader::CreateModuleScript(ModuleLoadRequest* aRequest)
+{
+ MOZ_ASSERT(!aRequest->mModuleScript);
+ MOZ_ASSERT(aRequest->mBaseURL);
+
+ nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject();
+ if (!globalObject) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsCOMPtr<nsIScriptContext> context = globalObject->GetScriptContext();
+ if (!context) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsAutoMicroTask mt;
+ AutoEntryScript aes(globalObject, "CompileModule", true);
+
+ bool oldProcessingScriptTag = context->GetProcessingScriptTag();
+ context->SetProcessingScriptTag(true);
+
+ nsresult rv;
+ {
+ // Update our current script.
+ AutoCurrentScriptUpdater scriptUpdater(this, aRequest->mElement);
+ Maybe<AutoCurrentScriptUpdater> masterScriptUpdater;
+ nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
+ if (master != mDocument) {
+ masterScriptUpdater.emplace(master->ScriptLoader(),
+ aRequest->mElement);
+ }
+
+ JSContext* cx = aes.cx();
+ JS::Rooted<JSObject*> module(cx);
+
+ if (aRequest->mWasCompiledOMT) {
+ module = JS::FinishOffThreadModule(cx, aRequest->mOffThreadToken);
+ aRequest->mOffThreadToken = nullptr;
+ rv = module ? NS_OK : NS_ERROR_FAILURE;
+ } else {
+ JS::Rooted<JSObject*> global(cx, globalObject->GetGlobalJSObject());
+
+ JS::CompileOptions options(cx);
+ rv = FillCompileOptionsForRequest(aes, aRequest, global, &options);
+
+ if (NS_SUCCEEDED(rv)) {
+ nsAutoString inlineData;
+ SourceBufferHolder srcBuf = GetScriptSource(aRequest, inlineData);
+ rv = nsJSUtils::CompileModule(cx, srcBuf, global, options, &module);
+ }
+ }
+ MOZ_ASSERT(NS_SUCCEEDED(rv) == (module != nullptr));
+ RefPtr<ModuleScript> moduleScript = new ModuleScript(this, aRequest->mBaseURL);
+ aRequest->mModuleScript = moduleScript;
+
+ if (!module) {
+ // Compilation failed
+ MOZ_ASSERT(aes.HasException());
+ JS::Rooted<JS::Value> error(cx);
+ if (!aes.StealException(&error)) {
+ aRequest->mModuleScript = nullptr;
+ return NS_ERROR_FAILURE;
+ }
+
+ moduleScript->SetPreInstantiationError(error);
+ aRequest->ModuleErrored();
+ return NS_OK;
+ }
+
+ moduleScript->SetModuleRecord(module);
+
+ // Validate requested modules and treat failure to resolve module specifiers
+ // the same as a parse error.
+ nsCOMArray<nsIURI> urls;
+ rv = ResolveRequestedModules(aRequest, urls);
+ if (NS_FAILED(rv)) {
+ // ResolveRequestedModules sets pre-instanitation error on failure.
+ MOZ_ASSERT(moduleScript->IsErrored());
+ aRequest->ModuleErrored();
+ return NS_OK;
+ }
+ }
+
+ context->SetProcessingScriptTag(oldProcessingScriptTag);
+
+ return rv;
+}
+
+static bool
+CreateTypeError(JSContext* aCx, ModuleScript* aScript, const nsString& aMessage,
+ JS::MutableHandle<JS::Value> aError)
+{
+ JS::Rooted<JSObject*> module(aCx, aScript->ModuleRecord());
+ JS::Rooted<JSScript*> script(aCx, JS::GetModuleScript(aCx, module));
+ JS::Rooted<JSString*> filename(aCx);
+ filename = JS_NewStringCopyZ(aCx, JS_GetScriptFilename(script));
+ if (!filename) {
+ return false;
+ }
+
+ JS::Rooted<JSString*> message(aCx, JS_NewUCStringCopyZ(aCx, aMessage.get()));
+ if (!message) {
+ return false;
+ }
+
+ return JS::CreateError(aCx, JSEXN_TYPEERR, nullptr, filename, 0, 0, nullptr,
+ message, aError);
+}
+
+static nsresult
+HandleResolveFailure(JSContext* aCx, ModuleScript* aScript,
+ const nsAString& aSpecifier)
+{
+ // TODO: How can we get the line number of the failed import?
+
+ nsAutoString message(NS_LITERAL_STRING("Error resolving module specifier: "));
+ message.Append(aSpecifier);
+
+ JS::Rooted<JS::Value> error(aCx);
+ if (!CreateTypeError(aCx, aScript, message, &error)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ aScript->SetPreInstantiationError(error);
+ return NS_OK;
+}
+
+static already_AddRefed<nsIURI>
+ResolveModuleSpecifier(ModuleScript* aScript,
+ const nsAString& aSpecifier)
+{
+ // The following module specifiers are allowed by the spec:
+ // - a valid absolute URL
+ // - a valid relative URL that starts with "/", "./" or "../"
+ //
+ // Bareword module specifiers are currently disallowed as these may be given
+ // special meanings in the future.
+
+ nsCOMPtr<nsIURI> uri;
+ nsresult rv = NS_NewURI(getter_AddRefs(uri), aSpecifier);
+ if (NS_SUCCEEDED(rv)) {
+ return uri.forget();
+ }
+
+ if (rv != NS_ERROR_MALFORMED_URI) {
+ return nullptr;
+ }
+
+ if (!StringBeginsWith(aSpecifier, NS_LITERAL_STRING("/")) &&
+ !StringBeginsWith(aSpecifier, NS_LITERAL_STRING("./")) &&
+ !StringBeginsWith(aSpecifier, NS_LITERAL_STRING("../"))) {
+ return nullptr;
+ }
+
+ rv = NS_NewURI(getter_AddRefs(uri), aSpecifier, nullptr, aScript->BaseURL());
+ if (NS_SUCCEEDED(rv)) {
+ return uri.forget();
+ }
+
+ return nullptr;
+}
+
+static nsresult
+RequestedModuleIsInAncestorList(ModuleLoadRequest* aRequest, nsIURI* aURL, bool* aResult)
+{
+ const size_t ImportDepthLimit = 100;
+
+ *aResult = false;
+ size_t depth = 0;
+ while (aRequest) {
+ if (depth++ == ImportDepthLimit) {
+ return NS_ERROR_FAILURE;
+ }
+
+ bool equal;
+ nsresult rv = aURL->Equals(aRequest->mURI, &equal);
+ NS_ENSURE_SUCCESS(rv, rv);
+ if (equal) {
+ *aResult = true;
+ return NS_OK;
+ }
+
+ aRequest = aRequest->mParent;
+ }
+
+ return NS_OK;
+}
+
+static nsresult
+ResolveRequestedModules(ModuleLoadRequest* aRequest, nsCOMArray<nsIURI> &aUrls)
+{
+ ModuleScript* ms = aRequest->mModuleScript;
+
+ AutoJSAPI jsapi;
+ if (!jsapi.Init(ms->ModuleRecord())) {
+ return NS_ERROR_FAILURE;
+ }
+
+ JSContext* cx = jsapi.cx();
+ JS::Rooted<JSObject*> moduleRecord(cx, ms->ModuleRecord());
+ JS::Rooted<JSObject*> specifiers(cx, JS::GetRequestedModules(cx, moduleRecord));
+
+ uint32_t length;
+ if (!JS_GetArrayLength(cx, specifiers, &length)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ JS::Rooted<JS::Value> val(cx);
+ for (uint32_t i = 0; i < length; i++) {
+ if (!JS_GetElement(cx, specifiers, i, &val)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsAutoJSString specifier;
+ if (!specifier.init(cx, val)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // Let url be the result of resolving a module specifier given module script and requested.
+ ModuleScript* ms = aRequest->mModuleScript;
+ nsCOMPtr<nsIURI> uri = ResolveModuleSpecifier(ms, specifier);
+ if (!uri) {
+ nsresult rv = HandleResolveFailure(cx, ms, specifier);
+ NS_ENSURE_SUCCESS(rv, rv);
+ return NS_ERROR_FAILURE;
+ }
+
+ bool isAncestor;
+ nsresult rv = RequestedModuleIsInAncestorList(aRequest, uri, &isAncestor);
+ NS_ENSURE_SUCCESS(rv, rv);
+ if (!isAncestor) {
+ aUrls.AppendElement(uri.forget());
+ }
+ }
+
+ return NS_OK;
+}
+
+void
+ScriptLoader::StartFetchingModuleDependencies(ModuleLoadRequest* aRequest)
+{
+ MOZ_ASSERT(aRequest->mModuleScript);
+ MOZ_ASSERT(!aRequest->mModuleScript->IsErrored());
+ MOZ_ASSERT(!aRequest->IsReadyToRun());
+
+ aRequest->mProgress = ModuleLoadRequest::Progress::FetchingImports;
+
+ nsCOMArray<nsIURI> urls;
+ nsresult rv = ResolveRequestedModules(aRequest, urls);
+ if (NS_FAILED(rv)) {
+ aRequest->ModuleErrored();
+ return;
+ }
+
+ if (urls.Length() == 0) {
+ // There are no descendents to load so this request is ready.
+ aRequest->DependenciesLoaded();
+ return;
+ }
+
+ // For each url in urls, fetch a module script tree given url, module script's
+ // CORS setting, and module script's settings object.
+ nsTArray<RefPtr<GenericPromise>> importsReady;
+ for (size_t i = 0; i < urls.Length(); i++) {
+ RefPtr<GenericPromise> childReady =
+ StartFetchingModuleAndDependencies(aRequest, urls[i]);
+ importsReady.AppendElement(childReady);
+ }
+
+ // Wait for all imports to become ready.
+ RefPtr<GenericPromise::AllPromiseType> allReady =
+ GenericPromise::All(AbstractThread::GetCurrent(), importsReady);
+ allReady->Then(AbstractThread::GetCurrent(), __func__, aRequest,
+ &ModuleLoadRequest::DependenciesLoaded,
+ &ModuleLoadRequest::ModuleErrored);
+}
+
+RefPtr<GenericPromise>
+ScriptLoader::StartFetchingModuleAndDependencies(ModuleLoadRequest* aRequest,
+ nsIURI* aURI)
+{
+ MOZ_ASSERT(aURI);
+
+ RefPtr<ModuleLoadRequest> childRequest =
+ new ModuleLoadRequest(aRequest->mElement, aRequest->mJSVersion,
+ aRequest->mCORSMode, aRequest->mIntegrity, this);
+
+ childRequest->mIsTopLevel = false;
+ childRequest->mURI = aURI;
+ childRequest->mIsInline = false;
+ childRequest->mReferrerPolicy = aRequest->mReferrerPolicy;
+ childRequest->mParent = aRequest;
+
+ RefPtr<GenericPromise> ready = childRequest->mReady.Ensure(__func__);
+
+ nsresult rv = StartLoad(childRequest, NS_LITERAL_STRING("module"), false);
+ if (NS_FAILED(rv)) {
+ MOZ_ASSERT(!childRequest->mModuleScript);
+ childRequest->mReady.Reject(rv, __func__);
+ return ready;
+ }
+
+ aRequest->mImports.AppendElement(childRequest);
+ return ready;
+}
+
+// 8.1.3.8.1 HostResolveImportedModule(referencingModule, specifier)
+bool
+HostResolveImportedModule(JSContext* aCx, unsigned argc, JS::Value* vp)
+{
+ MOZ_ASSERT(argc == 2);
+ JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+ JS::Rooted<JSObject*> module(aCx, &args[0].toObject());
+ JS::Rooted<JSString*> specifier(aCx, args[1].toString());
+
+ // Let referencing module script be referencingModule.[[HostDefined]].
+ JS::Value value = JS::GetModuleHostDefinedField(module);
+ auto script = static_cast<ModuleScript*>(value.toPrivate());
+ MOZ_ASSERT(script->ModuleRecord() == module);
+
+ // Let url be the result of resolving a module specifier given referencing
+ // module script and specifier.
+ nsAutoJSString string;
+ if (!string.init(aCx, specifier)) {
+ return false;
+ }
+
+ nsCOMPtr<nsIURI> uri = ResolveModuleSpecifier(script, string);
+
+ // This cannot fail because resolving a module specifier must have been
+ // previously successful with these same two arguments.
+ MOZ_ASSERT(uri, "Failed to resolve previously-resolved module specifier");
+
+ // Let resolved module script be moduleMap[url]. (This entry must exist for us
+ // to have gotten to this point.)
+
+ ModuleScript* ms = script->Loader()->GetFetchedModule(uri);
+ MOZ_ASSERT(ms, "Resolved module not found in module map");
+
+ MOZ_ASSERT(!ms->IsErrored());
+
+ *vp = JS::ObjectValue(*ms->ModuleRecord());
+ return true;
+}
+
+static nsresult
+EnsureModuleResolveHook(JSContext* aCx)
+{
+ if (JS::GetModuleResolveHook(aCx)) {
+ return NS_OK;
+ }
+
+ JS::Rooted<JSFunction*> func(aCx);
+ func = JS_NewFunction(aCx, HostResolveImportedModule, 2, 0,
+ "HostResolveImportedModule");
+ if (!func) {
+ return NS_ERROR_FAILURE;
+ }
+
+ JS::SetModuleResolveHook(aCx, func);
+ return NS_OK;
+}
+
+void
+ScriptLoader::CheckModuleDependenciesLoaded(ModuleLoadRequest* aRequest)
+{
+ RefPtr<ModuleScript> moduleScript = aRequest->mModuleScript;
+ if (moduleScript && !moduleScript->IsErrored()) {
+ for (auto childRequest : aRequest->mImports) {
+ ModuleScript* childScript = childRequest->mModuleScript;
+ if (!childScript) {
+ // Load error
+ aRequest->mModuleScript = nullptr;
+ return;
+ } else if (childScript->IsErrored()) {
+ // Script error
+ moduleScript->SetPreInstantiationError(childScript->Error());
+ return;
+ }
+ }
+ }
+}
+
+void
+ScriptLoader::ProcessLoadedModuleTree(ModuleLoadRequest* aRequest)
+{
+ if (aRequest->IsTopLevel()) {
+ ModuleScript* moduleScript = aRequest->mModuleScript;
+ if (moduleScript && !moduleScript->IsErrored()) {
+ if (!InstantiateModuleTree(aRequest)) {
+ aRequest->mModuleScript = nullptr;
+ }
+ }
+ MaybeMoveToLoadedList(aRequest);
+ ProcessPendingRequests();
+ }
+
+ if (aRequest->mWasCompiledOMT) {
+ mDocument->UnblockOnload(false);
+ }
+}
+
+bool
+ScriptLoader::InstantiateModuleTree(ModuleLoadRequest* aRequest)
+{
+ // Instantiate a top-level module and record any error.
+
+ MOZ_ASSERT(aRequest);
+ MOZ_ASSERT(aRequest->IsTopLevel());
+
+ ModuleScript* moduleScript = aRequest->mModuleScript;
+ MOZ_ASSERT(moduleScript);
+ MOZ_ASSERT(moduleScript->ModuleRecord());
+
+ nsAutoMicroTask mt;
+ AutoJSAPI jsapi;
+ if (NS_WARN_IF(!jsapi.Init(moduleScript->ModuleRecord()))) {
+ return false;
+ }
+
+ nsresult rv = EnsureModuleResolveHook(jsapi.cx());
+ NS_ENSURE_SUCCESS(rv, false);
+
+ JS::Rooted<JSObject*> module(jsapi.cx(), moduleScript->ModuleRecord());
+ bool ok = NS_SUCCEEDED(nsJSUtils::ModuleInstantiate(jsapi.cx(), module));
+
+ if (!ok) {
+ MOZ_ASSERT(jsapi.HasException());
+ JS::RootedValue exception(jsapi.cx());
+ if (!jsapi.StealException(&exception)) {
+ return false;
+ }
+ MOZ_ASSERT(!exception.isUndefined());
+ // Ignore the exception. It will be recorded in the module record.
+ }
+
+ return true;
+}
+
+nsresult
+ScriptLoader::StartLoad(ScriptLoadRequest *aRequest, const nsAString &aType,
+ bool aScriptFromHead)
+{
+ MOZ_ASSERT(aRequest->IsLoading());
+ NS_ENSURE_TRUE(mDocument, NS_ERROR_NULL_POINTER);
+
+ // If this document is sandboxed without 'allow-scripts', abort.
+ if (mDocument->HasScriptsBlockedBySandbox()) {
+ return NS_OK;
+ }
+
+ if (aRequest->IsModuleRequest()) {
+ // Check whether the module has been fetched or is currently being fetched,
+ // and if so wait for it.
+ ModuleLoadRequest* request = aRequest->AsModuleRequest();
+ if (ModuleMapContainsModule(request)) {
+ WaitForModuleFetch(request)
+ ->Then(AbstractThread::GetCurrent(), __func__, request,
+ &ModuleLoadRequest::ModuleLoaded,
+ &ModuleLoadRequest::LoadFailed);
+ return NS_OK;
+ }
+
+ // Otherwise put the URL in the module map and mark it as fetching.
+ SetModuleFetchStarted(request);
+ }
+
+ nsContentPolicyType contentPolicyType = aRequest->IsPreload()
+ ? nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD
+ : nsIContentPolicy::TYPE_INTERNAL_SCRIPT;
+ nsCOMPtr<nsINode> context;
+ if (aRequest->mElement) {
+ context = do_QueryInterface(aRequest->mElement);
+ }
+ else {
+ context = mDocument;
+ }
+
+ nsCOMPtr<nsILoadGroup> loadGroup = mDocument->GetDocumentLoadGroup();
+ nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->MasterDocument()->GetWindow();
+ NS_ENSURE_TRUE(window, NS_ERROR_NULL_POINTER);
+ nsIDocShell *docshell = window->GetDocShell();
+ nsCOMPtr<nsIInterfaceRequestor> prompter(do_QueryInterface(docshell));
+
+ nsSecurityFlags securityFlags;
+ if (aRequest->IsModuleRequest()) {
+ // According to the spec, module scripts have different behaviour to classic
+ // scripts and always use CORS.
+ securityFlags = nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
+ if (aRequest->mCORSMode == CORS_NONE) {
+ securityFlags |= nsILoadInfo::SEC_COOKIES_OMIT;
+ } else if (aRequest->mCORSMode == CORS_ANONYMOUS) {
+ securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN;
+ } else {
+ MOZ_ASSERT(aRequest->mCORSMode == CORS_USE_CREDENTIALS);
+ securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
+ }
+ } else {
+ securityFlags = aRequest->mCORSMode == CORS_NONE
+ ? nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL
+ : nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
+ if (aRequest->mCORSMode == CORS_ANONYMOUS) {
+ securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN;
+ } else if (aRequest->mCORSMode == CORS_USE_CREDENTIALS) {
+ securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
+ }
+ }
+ securityFlags |= nsILoadInfo::SEC_ALLOW_CHROME;
+
+ nsCOMPtr<nsIChannel> channel;
+ nsresult rv = NS_NewChannel(getter_AddRefs(channel),
+ aRequest->mURI,
+ context,
+ securityFlags,
+ contentPolicyType,
+ loadGroup,
+ prompter,
+ nsIRequest::LOAD_NORMAL |
+ nsIChannel::LOAD_CLASSIFY_URI);
+
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsIScriptElement *script = aRequest->mElement;
+ nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(channel));
+
+ if (cos) {
+ if (aScriptFromHead &&
+ !(script && (script->GetScriptAsync() || script->GetScriptDeferred()))) {
+ // synchronous head scripts block lading of most other non js/css
+ // content such as images
+ cos->AddClassFlags(nsIClassOfService::Leader);
+ } else if (!(script && script->GetScriptDeferred())) {
+ // other scripts are neither blocked nor prioritized unless marked deferred
+ cos->AddClassFlags(nsIClassOfService::Unblocked);
+ }
+ }
+
+ nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
+ if (httpChannel) {
+ // HTTP content negotation has little value in this context.
+ httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
+ NS_LITERAL_CSTRING("*/*"),
+ false);
+ httpChannel->SetReferrerWithPolicy(mDocument->GetDocumentURI(),
+ aRequest->mReferrerPolicy);
+
+ nsCOMPtr<nsIHttpChannelInternal> internalChannel(do_QueryInterface(httpChannel));
+ if (internalChannel) {
+ internalChannel->SetIntegrityMetadata(aRequest->mIntegrity.GetIntegrityString());
+ }
+ }
+
+ nsCOMPtr<nsILoadContext> loadContext(do_QueryInterface(docshell));
+ mozilla::net::PredictorLearn(aRequest->mURI, mDocument->GetDocumentURI(),
+ nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, loadContext);
+
+ // Set the initiator type
+ nsCOMPtr<nsITimedChannel> timedChannel(do_QueryInterface(httpChannel));
+ if (timedChannel) {
+ timedChannel->SetInitiatorType(NS_LITERAL_STRING("script"));
+ }
+
+ nsAutoPtr<mozilla::dom::SRICheckDataVerifier> sriDataVerifier;
+ if (!aRequest->mIntegrity.IsEmpty()) {
+ nsAutoCString sourceUri;
+ if (mDocument->GetDocumentURI()) {
+ mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
+ }
+ sriDataVerifier = new SRICheckDataVerifier(aRequest->mIntegrity, sourceUri,
+ mReporter);
+ }
+
+ RefPtr<ScriptLoadHandler> handler =
+ new ScriptLoadHandler(this, aRequest, sriDataVerifier.forget());
+
+ nsCOMPtr<nsIIncrementalStreamLoader> loader;
+ rv = NS_NewIncrementalStreamLoader(getter_AddRefs(loader), handler);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ return channel->AsyncOpen2(loader);
+}
+
+bool
+ScriptLoader::PreloadURIComparator::Equals(const PreloadInfo &aPi,
+ nsIURI * const &aURI) const
+{
+ bool same;
+ return NS_SUCCEEDED(aPi.mRequest->mURI->Equals(aURI, &same)) &&
+ same;
+}
+
+class ScriptRequestProcessor : public Runnable
+{
+private:
+ RefPtr<ScriptLoader> mLoader;
+ RefPtr<ScriptLoadRequest> mRequest;
+public:
+ ScriptRequestProcessor(ScriptLoader* aLoader,
+ ScriptLoadRequest* aRequest)
+ : mLoader(aLoader)
+ , mRequest(aRequest)
+ {}
+ NS_IMETHOD Run() override
+ {
+ return mLoader->ProcessRequest(mRequest);
+ }
+};
+
+static inline bool
+ParseTypeAttribute(const nsAString& aType, JSVersion* aVersion)
+{
+ MOZ_ASSERT(!aType.IsEmpty());
+ MOZ_ASSERT(aVersion);
+ MOZ_ASSERT(*aVersion == JSVERSION_DEFAULT);
+
+ nsContentTypeParser parser(aType);
+
+ nsAutoString mimeType;
+ nsresult rv = parser.GetType(mimeType);
+ NS_ENSURE_SUCCESS(rv, false);
+
+ if (!nsContentUtils::IsJavascriptMIMEType(mimeType)) {
+ return false;
+ }
+
+ // Get the version string, and ensure the language supports it.
+ nsAutoString versionName;
+ rv = parser.GetParameter("version", versionName);
+
+ if (NS_SUCCEEDED(rv)) {
+ *aVersion = nsContentUtils::ParseJavascriptVersion(versionName);
+ } else if (rv != NS_ERROR_INVALID_ARG) {
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+CSPAllowsInlineScript(nsIScriptElement *aElement, nsIDocument *aDocument)
+{
+ nsCOMPtr<nsIContentSecurityPolicy> csp;
+ // Note: For imports NodePrincipal and the principal of the master are
+ // the same.
+ nsresult rv = aDocument->NodePrincipal()->GetCsp(getter_AddRefs(csp));
+ NS_ENSURE_SUCCESS(rv, false);
+
+ if (!csp) {
+ // no CSP --> allow
+ return true;
+ }
+
+ // query the nonce
+ nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement);
+ nsAutoString nonce;
+ scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::nonce, nonce);
+ bool parserCreated = aElement->GetParserCreated() != mozilla::dom::NOT_FROM_PARSER;
+
+ // query the scripttext
+ nsAutoString scriptText;
+ aElement->GetScriptText(scriptText);
+
+ bool allowInlineScript = false;
+ rv = csp->GetAllowsInline(nsIContentPolicy::TYPE_SCRIPT,
+ nonce, parserCreated, scriptText,
+ aElement->GetScriptLineNumber(),
+ &allowInlineScript);
+ return allowInlineScript;
+}
+
+ScriptLoadRequest*
+ScriptLoader::CreateLoadRequest(ScriptKind aKind,
+ nsIScriptElement* aElement,
+ uint32_t aVersion, CORSMode aCORSMode,
+ const SRIMetadata &aIntegrity)
+{
+ if (aKind == ScriptKind::Classic) {
+ return new ScriptLoadRequest(aKind, aElement, aVersion, aCORSMode,
+ aIntegrity);
+ }
+
+ MOZ_ASSERT(aKind == ScriptKind::Module);
+ return new ModuleLoadRequest(aElement, aVersion, aCORSMode, aIntegrity, this);
+}
+
+bool
+ScriptLoader::ProcessScriptElement(nsIScriptElement *aElement)
+{
+ // We need a document to evaluate scripts.
+ NS_ENSURE_TRUE(mDocument, false);
+
+ // Check to see if scripts has been turned off.
+ if (!mEnabled || !mDocument->IsScriptEnabled()) {
+ return false;
+ }
+
+ NS_ASSERTION(!aElement->IsMalformed(), "Executing malformed script");
+
+ nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement);
+
+ // Step 13. Check that the script is not an eventhandler
+ if (IsScriptEventHandler(scriptContent)) {
+ return false;
+ }
+
+ JSVersion version = JSVERSION_DEFAULT;
+
+ // Check the type attribute to determine language and version.
+ // If type exists, it trumps the deprecated 'language='
+ nsAutoString type;
+ bool hasType = aElement->GetScriptType(type);
+
+ ScriptKind scriptKind = ScriptKind::Classic;
+ if (!type.IsEmpty()) {
+ if (ModuleScriptsEnabled() && type.LowerCaseEqualsASCII("module")) {
+ scriptKind = ScriptKind::Module;
+ } else {
+ NS_ENSURE_TRUE(ParseTypeAttribute(type, &version), false);
+ }
+ } else if (!hasType) {
+ // no 'type=' element
+ // "language" is a deprecated attribute of HTML, so we check it only for
+ // HTML script elements.
+ if (scriptContent->IsHTMLElement()) {
+ nsAutoString language;
+ scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::language, language);
+ if (!language.IsEmpty()) {
+ if (!nsContentUtils::IsJavaScriptLanguage(language)) {
+ return false;
+ }
+ }
+ }
+ }
+
+ // "In modern user agents that support module scripts, the script element with
+ // the nomodule attribute will be ignored".
+ // "The nomodule attribute must not be specified on module scripts (and will
+ // be ignored if it is)."
+ if (ModuleScriptsEnabled() &&
+ scriptKind == ScriptKind::Classic &&
+ scriptContent->IsHTMLElement() &&
+ scriptContent->HasAttr(kNameSpaceID_None, nsGkAtoms::nomodule)) {
+ return false;
+ }
+
+ // Step 15. and later in the HTML5 spec
+ nsresult rv = NS_OK;
+ RefPtr<ScriptLoadRequest> request;
+ if (aElement->GetScriptExternal()) {
+ // external script
+ nsCOMPtr<nsIURI> scriptURI = aElement->GetScriptURI();
+ if (!scriptURI) {
+ // Asynchronously report the failure to create a URI object
+ NS_DispatchToCurrentThread(
+ NewRunnableMethod(aElement,
+ &nsIScriptElement::FireErrorEvent));
+ return false;
+ }
+
+ // Double-check that the preload matches what we're asked to load now.
+ mozilla::net::ReferrerPolicy ourRefPolicy = mDocument->GetReferrerPolicy();
+ CORSMode ourCORSMode = aElement->GetCORSMode();
+ nsTArray<PreloadInfo>::index_type i =
+ mPreloads.IndexOf(scriptURI.get(), 0, PreloadURIComparator());
+ if (i != nsTArray<PreloadInfo>::NoIndex) {
+ // preloaded
+ // note that a script-inserted script can steal a preload!
+ request = mPreloads[i].mRequest;
+ request->mElement = aElement;
+ nsString preloadCharset(mPreloads[i].mCharset);
+ mPreloads.RemoveElementAt(i);
+
+ // Double-check that the charset the preload used is the same as
+ // the charset we have now.
+ nsAutoString elementCharset;
+ aElement->GetScriptCharset(elementCharset);
+ if (elementCharset.Equals(preloadCharset) &&
+ ourCORSMode == request->mCORSMode &&
+ ourRefPolicy == request->mReferrerPolicy &&
+ scriptKind == request->mKind) {
+ rv = CheckContentPolicy(mDocument, aElement, request->mURI, type, false);
+ if (NS_FAILED(rv)) {
+ // probably plans have changed; even though the preload was allowed seems
+ // like the actual load is not; let's cancel the preload request.
+ request->Cancel();
+ return false;
+ }
+ } else {
+ // Drop the preload
+ request = nullptr;
+ }
+ }
+
+ if (!request) {
+ // no usable preload
+
+ SRIMetadata sriMetadata;
+ {
+ nsAutoString integrity;
+ scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::integrity,
+ integrity);
+ if (!integrity.IsEmpty()) {
+ MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
+ ("ScriptLoader::ProcessScriptElement, integrity=%s",
+ NS_ConvertUTF16toUTF8(integrity).get()));
+ nsAutoCString sourceUri;
+ if (mDocument->GetDocumentURI()) {
+ mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
+ }
+ SRICheck::IntegrityMetadata(integrity, sourceUri, mReporter,
+ &sriMetadata);
+ }
+ }
+
+ request = CreateLoadRequest(scriptKind, aElement, version, ourCORSMode,
+ sriMetadata);
+ request->mURI = scriptURI;
+ request->mIsInline = false;
+ request->mReferrerPolicy = ourRefPolicy;
+
+ // set aScriptFromHead to false so we don't treat non preloaded scripts as
+ // blockers for full page load. See bug 792438.
+ rv = StartLoad(request, type, false);
+ if (NS_FAILED(rv)) {
+ // Asynchronously report the load failure
+ NS_DispatchToCurrentThread(
+ NewRunnableMethod(aElement,
+ &nsIScriptElement::FireErrorEvent));
+ return false;
+ }
+ }
+
+ // Should still be in loading stage of script.
+ NS_ASSERTION(!request->InCompilingStage(),
+ "Request should not yet be in compiling stage.");
+
+ request->mJSVersion = version;
+
+ if (aElement->GetScriptAsync()) {
+ request->mIsAsync = true;
+ if (request->IsReadyToRun()) {
+ mLoadedAsyncRequests.AppendElement(request);
+ // The script is available already. Run it ASAP when the event
+ // loop gets a chance to spin.
+
+ // KVKV TODO: Instead of processing immediately, try off-thread-parsing
+ // it and only schedule a pending ProcessRequest if that fails.
+ ProcessPendingRequestsAsync();
+ } else {
+ mLoadingAsyncRequests.AppendElement(request);
+ }
+ return false;
+ }
+ if (!aElement->GetParserCreated()) {
+ // Violate the HTML5 spec in order to make LABjs and the "order" plug-in
+ // for RequireJS work with their Gecko-sniffed code path. See
+ // http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html
+ request->mIsNonAsyncScriptInserted = true;
+ mNonAsyncExternalScriptInsertedRequests.AppendElement(request);
+ if (request->IsReadyToRun()) {
+ // The script is available already. Run it ASAP when the event
+ // loop gets a chance to spin.
+ ProcessPendingRequestsAsync();
+ }
+ return false;
+ }
+ // we now have a parser-inserted request that may or may not be still
+ // loading
+ if (aElement->GetScriptDeferred() || request->IsModuleRequest()) {
+ // We don't want to run this yet.
+ // If we come here, the script is a parser-created script and it has
+ // the defer attribute but not the async attribute. Since a
+ // a parser-inserted script is being run, we came here by the parser
+ // running the script, which means the parser is still alive and the
+ // parse is ongoing.
+ NS_ASSERTION(mDocument->GetCurrentContentSink() ||
+ aElement->GetParserCreated() == FROM_PARSER_XSLT,
+ "Non-XSLT Defer script on a document without an active parser; bug 592366.");
+ AddDeferRequest(request);
+ return false;
+ }
+
+ if (aElement->GetParserCreated() == FROM_PARSER_XSLT) {
+ // Need to maintain order for XSLT-inserted scripts
+ NS_ASSERTION(!mParserBlockingRequest,
+ "Parser-blocking scripts and XSLT scripts in the same doc!");
+ request->mIsXSLT = true;
+ mXSLTRequests.AppendElement(request);
+ if (request->IsReadyToRun()) {
+ // The script is available already. Run it ASAP when the event
+ // loop gets a chance to spin.
+ ProcessPendingRequestsAsync();
+ }
+ return true;
+ }
+
+ if (request->IsReadyToRun() && ReadyToExecuteParserBlockingScripts()) {
+ // The request has already been loaded and there are no pending style
+ // sheets. If the script comes from the network stream, cheat for
+ // performance reasons and avoid a trip through the event loop.
+ if (aElement->GetParserCreated() == FROM_PARSER_NETWORK) {
+ return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK;
+ }
+ // Otherwise, we've got a document.written script, make a trip through
+ // the event loop to hide the preload effects from the scripts on the
+ // Web page.
+ NS_ASSERTION(!mParserBlockingRequest,
+ "There can be only one parser-blocking script at a time");
+ NS_ASSERTION(mXSLTRequests.isEmpty(),
+ "Parser-blocking scripts and XSLT scripts in the same doc!");
+ mParserBlockingRequest = request;
+ ProcessPendingRequestsAsync();
+ return true;
+ }
+
+ // The script hasn't loaded yet or there's a style sheet blocking it.
+ // The script will be run when it loads or the style sheet loads.
+ NS_ASSERTION(!mParserBlockingRequest,
+ "There can be only one parser-blocking script at a time");
+ NS_ASSERTION(mXSLTRequests.isEmpty(),
+ "Parser-blocking scripts and XSLT scripts in the same doc!");
+ mParserBlockingRequest = request;
+ return true;
+ }
+
+ // inline script
+ // Is this document sandboxed without 'allow-scripts'?
+ if (mDocument->HasScriptsBlockedBySandbox()) {
+ return false;
+ }
+
+ // Does CSP allow this inline script to run?
+ if (!CSPAllowsInlineScript(aElement, mDocument)) {
+ return false;
+ }
+
+ // Inline scripts ignore ther CORS mode and are always CORS_NONE
+ request = CreateLoadRequest(scriptKind, aElement, version, CORS_NONE,
+ SRIMetadata()); // SRI doesn't apply
+ request->mJSVersion = version;
+ request->mIsInline = true;
+ request->mURI = mDocument->GetDocumentURI();
+ request->mLineNo = aElement->GetScriptLineNumber();
+
+ if (request->IsModuleRequest()) {
+ ModuleLoadRequest* modReq = request->AsModuleRequest();
+ modReq->mBaseURL = mDocument->GetDocBaseURI();
+ rv = CreateModuleScript(modReq);
+ MOZ_ASSERT(NS_FAILED(rv) == !modReq->mModuleScript);
+ if (NS_FAILED(rv)) {
+ modReq->LoadFailed();
+ return false;
+ }
+ if (aElement->GetScriptAsync()) {
+ mLoadingAsyncRequests.AppendElement(request);
+ } else {
+ AddDeferRequest(request);
+ }
+ if (!modReq->mModuleScript->IsErrored()) {
+ StartFetchingModuleDependencies(modReq);
+ }
+ return false;
+ }
+ request->mProgress = ScriptLoadRequest::Progress::Ready;
+ if (aElement->GetParserCreated() == FROM_PARSER_XSLT &&
+ (!ReadyToExecuteParserBlockingScripts() || !mXSLTRequests.isEmpty())) {
+ // Need to maintain order for XSLT-inserted scripts
+ NS_ASSERTION(!mParserBlockingRequest,
+ "Parser-blocking scripts and XSLT scripts in the same doc!");
+ mXSLTRequests.AppendElement(request);
+ return true;
+ }
+ if (aElement->GetParserCreated() == NOT_FROM_PARSER) {
+ NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
+ "A script-inserted script is inserted without an update batch?");
+ nsContentUtils::AddScriptRunner(new ScriptRequestProcessor(this,
+ request));
+ return false;
+ }
+ if (aElement->GetParserCreated() == FROM_PARSER_NETWORK &&
+ !ReadyToExecuteParserBlockingScripts()) {
+ NS_ASSERTION(!mParserBlockingRequest,
+ "There can be only one parser-blocking script at a time");
+ mParserBlockingRequest = request;
+ NS_ASSERTION(mXSLTRequests.isEmpty(),
+ "Parser-blocking scripts and XSLT scripts in the same doc!");
+ return true;
+ }
+ // We now have a document.written inline script or we have an inline script
+ // from the network but there is no style sheet that is blocking scripts.
+ // Don't check for style sheets blocking scripts in the document.write
+ // case to avoid style sheet network activity affecting when
+ // document.write returns. It's not really necessary to do this if
+ // there's no document.write currently on the call stack. However,
+ // this way matches IE more closely than checking if document.write
+ // is on the call stack.
+ NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
+ "Not safe to run a parser-inserted script?");
+ return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK;
+}
+
+namespace {
+
+class NotifyOffThreadScriptLoadCompletedRunnable : public Runnable
+{
+ RefPtr<ScriptLoadRequest> mRequest;
+ RefPtr<ScriptLoader> mLoader;
+ void *mToken;
+
+public:
+ NotifyOffThreadScriptLoadCompletedRunnable(ScriptLoadRequest* aRequest,
+ ScriptLoader* aLoader)
+ : mRequest(aRequest), mLoader(aLoader), mToken(nullptr)
+ {}
+
+ virtual ~NotifyOffThreadScriptLoadCompletedRunnable();
+
+ void SetToken(void* aToken) {
+ MOZ_ASSERT(aToken && !mToken);
+ mToken = aToken;
+ }
+
+ NS_DECL_NSIRUNNABLE
+};
+
+} /* anonymous namespace */
+
+nsresult
+ScriptLoader::ProcessOffThreadRequest(ScriptLoadRequest* aRequest)
+{
+ MOZ_ASSERT(aRequest->mProgress == ScriptLoadRequest::Progress::Compiling);
+ MOZ_ASSERT(!aRequest->mWasCompiledOMT);
+
+ aRequest->mWasCompiledOMT = true;
+
+ if (aRequest->IsModuleRequest()) {
+ MOZ_ASSERT(aRequest->mOffThreadToken);
+ ModuleLoadRequest* request = aRequest->AsModuleRequest();
+ return ProcessFetchedModuleSource(request);
+ }
+
+ aRequest->SetReady();
+
+ if (aRequest == mParserBlockingRequest) {
+ if (!ReadyToExecuteParserBlockingScripts()) {
+ // If not ready to execute scripts, schedule an async call to
+ // ProcessPendingRequests to handle it.
+ ProcessPendingRequestsAsync();
+ return NS_OK;
+ }
+
+ // Same logic as in top of ProcessPendingRequests.
+ mParserBlockingRequest = nullptr;
+ UnblockParser(aRequest);
+ ProcessRequest(aRequest);
+ mDocument->UnblockOnload(false);
+ ContinueParserAsync(aRequest);
+ return NS_OK;
+ }
+
+ nsresult rv = ProcessRequest(aRequest);
+ mDocument->UnblockOnload(false);
+ return rv;
+}
+
+NotifyOffThreadScriptLoadCompletedRunnable::~NotifyOffThreadScriptLoadCompletedRunnable()
+{
+ if (MOZ_UNLIKELY(mRequest || mLoader) && !NS_IsMainThread()) {
+ NS_ReleaseOnMainThread(mRequest.forget());
+ NS_ReleaseOnMainThread(mLoader.forget());
+ }
+}
+
+NS_IMETHODIMP
+NotifyOffThreadScriptLoadCompletedRunnable::Run()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+
+ // We want these to be dropped on the main thread, once we return from this
+ // function.
+ RefPtr<ScriptLoadRequest> request = mRequest.forget();
+ RefPtr<ScriptLoader> loader = mLoader.forget();
+
+ request->mOffThreadToken = mToken;
+ nsresult rv = loader->ProcessOffThreadRequest(request);
+
+ return rv;
+}
+
+static void
+OffThreadScriptLoaderCallback(void *aToken, void *aCallbackData)
+{
+ RefPtr<NotifyOffThreadScriptLoadCompletedRunnable> aRunnable =
+ dont_AddRef(static_cast<NotifyOffThreadScriptLoadCompletedRunnable*>(aCallbackData));
+ aRunnable->SetToken(aToken);
+ NS_DispatchToMainThread(aRunnable);
+}
+
+nsresult
+ScriptLoader::AttemptAsyncScriptCompile(ScriptLoadRequest* aRequest)
+{
+ MOZ_ASSERT_IF(!aRequest->IsModuleRequest(), aRequest->IsReadyToRun());
+ MOZ_ASSERT(!aRequest->mWasCompiledOMT);
+
+ // Don't off-thread compile inline scripts.
+ if (aRequest->mIsInline) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject();
+ if (!globalObject) {
+ return NS_ERROR_FAILURE;
+ }
+
+ AutoJSAPI jsapi;
+ if (!jsapi.Init(globalObject)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ JSContext* cx = jsapi.cx();
+ JS::Rooted<JSObject*> global(cx, globalObject->GetGlobalJSObject());
+ JS::CompileOptions options(cx);
+
+ nsresult rv = FillCompileOptionsForRequest(jsapi, aRequest, global, &options);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ if (!JS::CanCompileOffThread(cx, options, aRequest->mScriptTextLength)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ RefPtr<NotifyOffThreadScriptLoadCompletedRunnable> runnable =
+ new NotifyOffThreadScriptLoadCompletedRunnable(aRequest, this);
+
+ if (aRequest->IsModuleRequest()) {
+ if (!JS::CompileOffThreadModule(cx, options,
+ aRequest->mScriptTextBuf, aRequest->mScriptTextLength,
+ OffThreadScriptLoaderCallback,
+ static_cast<void*>(runnable))) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ } else {
+ if (!JS::CompileOffThread(cx, options,
+ aRequest->mScriptTextBuf, aRequest->mScriptTextLength,
+ OffThreadScriptLoaderCallback,
+ static_cast<void*>(runnable))) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ }
+
+ mDocument->BlockOnload();
+ aRequest->mProgress = ScriptLoadRequest::Progress::Compiling;
+
+ Unused << runnable.forget();
+ return NS_OK;
+}
+
+nsresult
+ScriptLoader::CompileOffThreadOrProcessRequest(ScriptLoadRequest* aRequest)
+{
+ NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
+ "Processing requests when running scripts is unsafe.");
+ NS_ASSERTION(!aRequest->mOffThreadToken,
+ "Candidate for off-thread compile is already parsed off-thread");
+ NS_ASSERTION(!aRequest->InCompilingStage(),
+ "Candidate for off-thread compile is already in compiling stage.");
+
+ nsresult rv = AttemptAsyncScriptCompile(aRequest);
+ if (NS_SUCCEEDED(rv)) {
+ return rv;
+ }
+
+ return ProcessRequest(aRequest);
+}
+
+SourceBufferHolder
+ScriptLoader::GetScriptSource(ScriptLoadRequest* aRequest, nsAutoString& inlineData)
+{
+ // Return a SourceBufferHolder object holding the script's source text.
+ // |inlineData| is used to hold the text for inline objects.
+
+ // If there's no script text, we try to get it from the element
+ if (aRequest->mIsInline) {
+ // XXX This is inefficient - GetText makes multiple
+ // copies.
+ aRequest->mElement->GetScriptText(inlineData);
+ return SourceBufferHolder(inlineData.get(),
+ inlineData.Length(),
+ SourceBufferHolder::NoOwnership);
+ }
+
+ return SourceBufferHolder(aRequest->mScriptTextBuf,
+ aRequest->mScriptTextLength,
+ SourceBufferHolder::NoOwnership);
+}
+
+nsresult
+ScriptLoader::ProcessRequest(ScriptLoadRequest* aRequest)
+{
+ NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
+ "Processing requests when running scripts is unsafe.");
+ NS_ASSERTION(aRequest->IsReadyToRun(),
+ "Processing a request that is not ready to run.");
+
+ NS_ENSURE_ARG(aRequest);
+
+ if (aRequest->IsModuleRequest() &&
+ !aRequest->AsModuleRequest()->mModuleScript)
+ {
+ // There was an error fetching a module script. Nothing to do here.
+ FireScriptAvailable(NS_ERROR_FAILURE, aRequest);
+ return NS_OK;
+ }
+
+ nsCOMPtr<nsINode> scriptElem = do_QueryInterface(aRequest->mElement);
+
+ nsCOMPtr<nsIDocument> doc;
+ if (!aRequest->mIsInline) {
+ doc = scriptElem->OwnerDoc();
+ }
+
+ nsCOMPtr<nsIScriptElement> oldParserInsertedScript;
+ uint32_t parserCreated = aRequest->mElement->GetParserCreated();
+ if (parserCreated) {
+ oldParserInsertedScript = mCurrentParserInsertedScript;
+ mCurrentParserInsertedScript = aRequest->mElement;
+ }
+
+ aRequest->mElement->BeginEvaluating();
+
+ FireScriptAvailable(NS_OK, aRequest);
+
+ // The window may have gone away by this point, in which case there's no point
+ // in trying to run the script.
+ nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
+ {
+ // Try to perform a microtask checkpoint
+ nsAutoMicroTask mt;
+ }
+
+ nsPIDOMWindowInner *pwin = master->GetInnerWindow();
+ bool runScript = !!pwin;
+ if (runScript) {
+ nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(),
+ scriptElem,
+ NS_LITERAL_STRING("beforescriptexecute"),
+ true, true, &runScript);
+ }
+
+ // Inner window could have gone away after firing beforescriptexecute
+ pwin = master->GetInnerWindow();
+ if (!pwin) {
+ runScript = false;
+ }
+
+ nsresult rv = NS_OK;
+ if (runScript) {
+ if (doc) {
+ doc->BeginEvaluatingExternalScript();
+ }
+ rv = EvaluateScript(aRequest);
+ if (doc) {
+ doc->EndEvaluatingExternalScript();
+ }
+
+ nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(),
+ scriptElem,
+ NS_LITERAL_STRING("afterscriptexecute"),
+ true, false);
+ }
+
+ FireScriptEvaluated(rv, aRequest);
+
+ aRequest->mElement->EndEvaluating();
+
+ if (parserCreated) {
+ mCurrentParserInsertedScript = oldParserInsertedScript;
+ }
+
+ if (aRequest->mOffThreadToken) {
+ // The request was parsed off-main-thread, but the result of the off
+ // thread parse was not actually needed to process the request
+ // (disappearing window, some other error, ...). Finish the
+ // request to avoid leaks in the JS engine.
+ MOZ_ASSERT(!aRequest->IsModuleRequest());
+ aRequest->MaybeCancelOffThreadScript();
+ }
+
+ // Free any source data.
+ free(aRequest->mScriptTextBuf);
+ aRequest->mScriptTextBuf = nullptr;
+ aRequest->mScriptTextLength = 0;
+
+ return rv;
+}
+
+void
+ScriptLoader::FireScriptAvailable(nsresult aResult,
+ ScriptLoadRequest* aRequest)
+{
+ for (int32_t i = 0; i < mObservers.Count(); i++) {
+ nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i];
+ obs->ScriptAvailable(aResult, aRequest->mElement,
+ aRequest->mIsInline, aRequest->mURI,
+ aRequest->mLineNo);
+ }
+
+ aRequest->FireScriptAvailable(aResult);
+}
+
+void
+ScriptLoader::FireScriptEvaluated(nsresult aResult,
+ ScriptLoadRequest* aRequest)
+{
+ for (int32_t i = 0; i < mObservers.Count(); i++) {
+ nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i];
+ obs->ScriptEvaluated(aResult, aRequest->mElement,
+ aRequest->mIsInline);
+ }
+
+ aRequest->FireScriptEvaluated(aResult);
+}
+
+already_AddRefed<nsIScriptGlobalObject>
+ScriptLoader::GetScriptGlobalObject()
+{
+ nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
+ nsPIDOMWindowInner *pwin = master->GetInnerWindow();
+ if (!pwin) {
+ return nullptr;
+ }
+
+ nsCOMPtr<nsIScriptGlobalObject> globalObject = do_QueryInterface(pwin);
+ NS_ASSERTION(globalObject, "windows must be global objects");
+
+ // and make sure we are setup for this type of script.
+ nsresult rv = globalObject->EnsureScriptEnvironment();
+ if (NS_FAILED(rv)) {
+ return nullptr;
+ }
+
+ return globalObject.forget();
+}
+
+nsresult
+ScriptLoader::FillCompileOptionsForRequest(const AutoJSAPI&jsapi,
+ ScriptLoadRequest* aRequest,
+ JS::Handle<JSObject*> aScopeChain,
+ JS::CompileOptions* aOptions)
+{
+ // It's very important to use aRequest->mURI, not the final URI of the channel
+ // aRequest ended up getting script data from, as the script filename.
+ nsresult rv;
+ nsContentUtils::GetWrapperSafeScriptFilename(mDocument, aRequest->mURI,
+ aRequest->mURL, &rv);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ bool isScriptElement = !aRequest->IsModuleRequest() ||
+ aRequest->AsModuleRequest()->IsTopLevel();
+ aOptions->setIntroductionType(isScriptElement ? "scriptElement"
+ : "importedModule");
+ aOptions->setFileAndLine(aRequest->mURL.get(), aRequest->mLineNo);
+ aOptions->setVersion(JSVersion(aRequest->mJSVersion));
+ aOptions->setIsRunOnce(true);
+ // We only need the setNoScriptRval bit when compiling off-thread here, since
+ // otherwise nsJSUtils::EvaluateString will set it up for us.
+ aOptions->setNoScriptRval(true);
+ if (aRequest->mHasSourceMapURL) {
+ aOptions->setSourceMapURL(aRequest->mSourceMapURL.get());
+ }
+ if (aRequest->mOriginPrincipal) {
+ nsIPrincipal* scriptPrin = nsContentUtils::ObjectPrincipal(aScopeChain);
+ bool subsumes = scriptPrin->Subsumes(aRequest->mOriginPrincipal);
+ aOptions->setMutedErrors(!subsumes);
+ }
+
+ JSContext* cx = jsapi.cx();
+ JS::Rooted<JS::Value> elementVal(cx);
+ MOZ_ASSERT(aRequest->mElement);
+ if (NS_SUCCEEDED(nsContentUtils::WrapNative(cx, aRequest->mElement,
+ &elementVal,
+ /* aAllowWrapping = */ true))) {
+ MOZ_ASSERT(elementVal.isObject());
+ aOptions->setElement(&elementVal.toObject());
+ }
+
+ return NS_OK;
+}
+
+nsresult
+ScriptLoader::EvaluateScript(ScriptLoadRequest* aRequest)
+{
+ // We need a document to evaluate scripts.
+ if (!mDocument) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsCOMPtr<nsIContent> scriptContent(do_QueryInterface(aRequest->mElement));
+ nsIDocument* ownerDoc = scriptContent->OwnerDoc();
+ if (ownerDoc != mDocument) {
+ // Willful violation of HTML5 as of 2010-12-01
+ return NS_ERROR_FAILURE;
+ }
+
+ // Get the script-type to be used by this element.
+ NS_ASSERTION(scriptContent, "no content - what is default script-type?");
+
+ nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject();
+ if (!globalObject) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // Make sure context is a strong reference since we access it after
+ // we've executed a script, which may cause all other references to
+ // the context to go away.
+ nsCOMPtr<nsIScriptContext> context = globalObject->GetScriptContext();
+ if (!context) {
+ return NS_ERROR_FAILURE;
+ }
+
+ JSVersion version = JSVersion(aRequest->mJSVersion);
+ if (version == JSVERSION_UNKNOWN) {
+ return NS_OK;
+ }
+
+ // New script entry point required, due to the "Create a script" sub-step of
+ // http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block
+ nsAutoMicroTask mt;
+ AutoEntryScript aes(globalObject, "<script> element", true);
+ JSContext* cx = aes.cx();
+ JS::Rooted<JSObject*> global(cx, globalObject->GetGlobalJSObject());
+
+ bool oldProcessingScriptTag = context->GetProcessingScriptTag();
+ context->SetProcessingScriptTag(true);
+ nsresult rv;
+ {
+ // Update our current script.
+ AutoCurrentScriptUpdater scriptUpdater(this, aRequest->mElement);
+ Maybe<AutoCurrentScriptUpdater> masterScriptUpdater;
+ nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
+ if (master != mDocument) {
+ // If this script belongs to an import document, it will be
+ // executed in the context of the master document. During the
+ // execution currentScript of the master should refer to this
+ // script. So let's update the mCurrentScript of the ScriptLoader
+ // of the master document too.
+ masterScriptUpdater.emplace(master->ScriptLoader(),
+ aRequest->mElement);
+ }
+
+ if (aRequest->IsModuleRequest()) {
+ rv = EnsureModuleResolveHook(cx);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ ModuleLoadRequest* request = aRequest->AsModuleRequest();
+ MOZ_ASSERT(request->mModuleScript);
+ MOZ_ASSERT(!request->mOffThreadToken);
+
+ ModuleScript* moduleScript = request->mModuleScript;
+ if (moduleScript->IsErrored()) {
+ // Module has an error status
+ JS::Rooted<JS::Value> error(cx, moduleScript->Error());
+ JS_SetPendingException(cx, error);
+ return NS_OK; // An error is reported by AutoEntryScript.
+ }
+
+ JS::Rooted<JSObject*> module(cx, moduleScript->ModuleRecord());
+ MOZ_ASSERT(module);
+
+ rv = nsJSUtils::ModuleEvaluate(cx, module);
+ MOZ_ASSERT(NS_FAILED(rv) == aes.HasException());
+ if (NS_FAILED(rv)) {
+ // Evaluation failed
+ rv = NS_OK; // An error is reported by AutoEntryScript.
+ }
+ } else {
+ JS::CompileOptions options(cx);
+ rv = FillCompileOptionsForRequest(aes, aRequest, global, &options);
+
+ if (NS_SUCCEEDED(rv)) {
+ nsAutoString inlineData;
+ SourceBufferHolder srcBuf = GetScriptSource(aRequest, inlineData);
+ rv = nsJSUtils::EvaluateString(cx, srcBuf, global, options,
+ aRequest->OffThreadTokenPtr());
+ }
+ }
+ }
+
+ context->SetProcessingScriptTag(oldProcessingScriptTag);
+ return rv;
+}
+
+void
+ScriptLoader::ProcessPendingRequestsAsync()
+{
+ if (mParserBlockingRequest ||
+ !mXSLTRequests.isEmpty() ||
+ !mLoadedAsyncRequests.isEmpty() ||
+ !mNonAsyncExternalScriptInsertedRequests.isEmpty() ||
+ !mDeferRequests.isEmpty() ||
+ !mPendingChildLoaders.IsEmpty()) {
+ NS_DispatchToCurrentThread(NewRunnableMethod(this,
+ &ScriptLoader::ProcessPendingRequests));
+ }
+}
+
+void
+ScriptLoader::ProcessPendingRequests()
+{
+ RefPtr<ScriptLoadRequest> request;
+
+ if (mParserBlockingRequest &&
+ mParserBlockingRequest->IsReadyToRun() &&
+ ReadyToExecuteParserBlockingScripts()) {
+ request.swap(mParserBlockingRequest);
+ UnblockParser(request);
+ ProcessRequest(request);
+ if (request->mWasCompiledOMT) {
+ mDocument->UnblockOnload(false);
+ }
+ ContinueParserAsync(request);
+ }
+
+ while (ReadyToExecuteParserBlockingScripts() &&
+ !mXSLTRequests.isEmpty() &&
+ mXSLTRequests.getFirst()->IsReadyToRun()) {
+ request = mXSLTRequests.StealFirst();
+ ProcessRequest(request);
+ }
+
+ while (ReadyToExecuteScripts() && !mLoadedAsyncRequests.isEmpty()) {
+ request = mLoadedAsyncRequests.StealFirst();
+ if (request->IsModuleRequest()) {
+ ProcessRequest(request);
+ } else {
+ CompileOffThreadOrProcessRequest(request);
+ }
+ }
+
+ while (ReadyToExecuteScripts() &&
+ !mNonAsyncExternalScriptInsertedRequests.isEmpty() &&
+ mNonAsyncExternalScriptInsertedRequests.getFirst()->IsReadyToRun()) {
+ // Violate the HTML5 spec and execute these in the insertion order in
+ // order to make LABjs and the "order" plug-in for RequireJS work with
+ // their Gecko-sniffed code path. See
+ // http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html
+ request = mNonAsyncExternalScriptInsertedRequests.StealFirst();
+ ProcessRequest(request);
+ }
+
+ if (mDocumentParsingDone && mXSLTRequests.isEmpty()) {
+ while (ReadyToExecuteScripts() &&
+ !mDeferRequests.isEmpty() &&
+ mDeferRequests.getFirst()->IsReadyToRun()) {
+ request = mDeferRequests.StealFirst();
+ ProcessRequest(request);
+ }
+ }
+
+ while (!mPendingChildLoaders.IsEmpty() &&
+ ReadyToExecuteParserBlockingScripts()) {
+ RefPtr<ScriptLoader> child = mPendingChildLoaders[0];
+ mPendingChildLoaders.RemoveElementAt(0);
+ child->RemoveParserBlockingScriptExecutionBlocker();
+ }
+
+ if (mDocumentParsingDone && mDocument && !mParserBlockingRequest &&
+ mNonAsyncExternalScriptInsertedRequests.isEmpty() &&
+ mXSLTRequests.isEmpty() && mDeferRequests.isEmpty() &&
+ MaybeRemovedDeferRequests()) {
+ return ProcessPendingRequests();
+ }
+
+ if (mDocumentParsingDone && mDocument &&
+ !mParserBlockingRequest && mLoadingAsyncRequests.isEmpty() &&
+ mLoadedAsyncRequests.isEmpty() &&
+ mNonAsyncExternalScriptInsertedRequests.isEmpty() &&
+ mXSLTRequests.isEmpty() && mDeferRequests.isEmpty()) {
+ // No more pending scripts; time to unblock onload.
+ // OK to unblock onload synchronously here, since callers must be
+ // prepared for the world changing anyway.
+ mDocumentParsingDone = false;
+ mDocument->UnblockOnload(true);
+ }
+}
+
+bool
+ScriptLoader::ReadyToExecuteParserBlockingScripts()
+{
+ // Make sure the SelfReadyToExecuteParserBlockingScripts check is first, so
+ // that we don't block twice on an ancestor.
+ if (!SelfReadyToExecuteParserBlockingScripts()) {
+ return false;
+ }
+
+ for (nsIDocument* doc = mDocument; doc; doc = doc->GetParentDocument()) {
+ ScriptLoader* ancestor = doc->ScriptLoader();
+ if (!ancestor->SelfReadyToExecuteParserBlockingScripts() &&
+ ancestor->AddPendingChildLoader(this)) {
+ AddParserBlockingScriptExecutionBlocker();
+ return false;
+ }
+ }
+
+ if (mDocument && !mDocument->IsMasterDocument()) {
+ RefPtr<ImportManager> im = mDocument->ImportManager();
+ RefPtr<ImportLoader> loader = im->Find(mDocument);
+ MOZ_ASSERT(loader, "How can we have an import document without a loader?");
+
+ // The referring link that counts in the execution order calculation
+ // (in spec: flagged as branch)
+ nsCOMPtr<nsINode> referrer = loader->GetMainReferrer();
+ MOZ_ASSERT(referrer, "There has to be a main referring link for each imports");
+
+ // Import documents are blocked by their import predecessors. We need to
+ // wait with script execution until all the predecessors are done.
+ // Technically it means we have to wait for the last one to finish,
+ // which is the neares one to us in the order.
+ RefPtr<ImportLoader> lastPred = im->GetNearestPredecessor(referrer);
+ if (!lastPred) {
+ // If there is no predecessor we can run.
+ return true;
+ }
+
+ nsCOMPtr<nsIDocument> doc = lastPred->GetDocument();
+ if (lastPred->IsBlocking() || !doc ||
+ !doc->ScriptLoader()->SelfReadyToExecuteParserBlockingScripts()) {
+ // Document has not been created yet or it was created but not ready.
+ // Either case we are blocked by it. The ImportLoader will take care
+ // of blocking us, and adding the pending child loader to the blocking
+ // ScriptLoader when it's possible (at this point the blocking loader
+ // might not have created the document/ScriptLoader)
+ lastPred->AddBlockedScriptLoader(this);
+ // As more imports are parsed, this can change, let's cache what we
+ // blocked, so it can be later updated if needed (see: ImportLoader::Updater).
+ loader->SetBlockingPredecessor(lastPred);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/* static */ nsresult
+ScriptLoader::ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData,
+ uint32_t aLength, const nsAString& aHintCharset,
+ nsIDocument* aDocument,
+ char16_t*& aBufOut, size_t& aLengthOut)
+{
+ if (!aLength) {
+ aBufOut = nullptr;
+ aLengthOut = 0;
+ return NS_OK;
+ }
+
+ // The encoding info precedence is as follows from high to low:
+ // The BOM
+ // HTTP Content-Type (if name recognized)
+ // charset attribute (if name recognized)
+ // The encoding of the document
+
+ nsAutoCString charset;
+
+ nsCOMPtr<nsIUnicodeDecoder> unicodeDecoder;
+
+ if (nsContentUtils::CheckForBOM(aData, aLength, charset)) {
+ // charset is now one of "UTF-16BE", "UTF-16BE" or "UTF-8". Those decoder
+ // will take care of swallowing the BOM.
+ unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
+ }
+
+ if (!unicodeDecoder &&
+ aChannel &&
+ NS_SUCCEEDED(aChannel->GetContentCharset(charset)) &&
+ EncodingUtils::FindEncodingForLabel(charset, charset)) {
+ unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
+ }
+
+ if (!unicodeDecoder &&
+ EncodingUtils::FindEncodingForLabel(aHintCharset, charset)) {
+ unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
+ }
+
+ if (!unicodeDecoder && aDocument) {
+ charset = aDocument->GetDocumentCharacterSet();
+ unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
+ }
+
+ if (!unicodeDecoder) {
+ // Curiously, there are various callers that don't pass aDocument. The
+ // fallback in the old code was ISO-8859-1, which behaved like
+ // windows-1252. Saying windows-1252 for clarity and for compliance
+ // with the Encoding Standard.
+ unicodeDecoder = EncodingUtils::DecoderForEncoding("windows-1252");
+ }
+
+ int32_t unicodeLength = 0;
+
+ nsresult rv =
+ unicodeDecoder->GetMaxLength(reinterpret_cast<const char*>(aData),
+ aLength, &unicodeLength);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ aBufOut = static_cast<char16_t*>(js_malloc(unicodeLength * sizeof(char16_t)));
+ if (!aBufOut) {
+ aLengthOut = 0;
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ aLengthOut = unicodeLength;
+
+ rv = unicodeDecoder->Convert(reinterpret_cast<const char*>(aData),
+ (int32_t *) &aLength, aBufOut,
+ &unicodeLength);
+ MOZ_ASSERT(NS_SUCCEEDED(rv));
+ aLengthOut = unicodeLength;
+ if (NS_FAILED(rv)) {
+ js_free(aBufOut);
+ aBufOut = nullptr;
+ aLengthOut = 0;
+ }
+ return rv;
+}
+
+nsresult
+ScriptLoader::OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
+ nsISupports* aContext,
+ nsresult aChannelStatus,
+ nsresult aSRIStatus,
+ mozilla::Vector<char16_t> &aString,
+ mozilla::dom::SRICheckDataVerifier* aSRIDataVerifier)
+{
+ ScriptLoadRequest* request = static_cast<ScriptLoadRequest*>(aContext);
+ NS_ASSERTION(request, "null request in stream complete handler");
+ NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
+
+ nsCOMPtr<nsIRequest> channelRequest;
+ aLoader->GetRequest(getter_AddRefs(channelRequest));
+ nsCOMPtr<nsIChannel> channel;
+ channel = do_QueryInterface(channelRequest);
+
+ nsresult rv = NS_OK;
+ if (!request->mIntegrity.IsEmpty() &&
+ NS_SUCCEEDED((rv = aSRIStatus))) {
+ MOZ_ASSERT(aSRIDataVerifier);
+ MOZ_ASSERT(mReporter);
+
+ nsAutoCString sourceUri;
+ if (mDocument && mDocument->GetDocumentURI()) {
+ mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
+ }
+ rv = aSRIDataVerifier->Verify(request->mIntegrity, channel, sourceUri,
+ mReporter);
+ mReporter->FlushConsoleReports(mDocument);
+ if (NS_FAILED(rv)) {
+ rv = NS_ERROR_SRI_CORRUPT;
+ }
+ } else {
+ nsCOMPtr<nsILoadInfo> loadInfo = channel->GetLoadInfo();
+
+ if (loadInfo->GetEnforceSRI()) {
+ MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
+ ("ScriptLoader::OnStreamComplete, required SRI not found"));
+ nsCOMPtr<nsIContentSecurityPolicy> csp;
+ loadInfo->LoadingPrincipal()->GetCsp(getter_AddRefs(csp));
+ nsAutoCString violationURISpec;
+ mDocument->GetDocumentURI()->GetAsciiSpec(violationURISpec);
+ uint32_t lineNo = request->mElement ? request->mElement->GetScriptLineNumber() : 0;
+ csp->LogViolationDetails(
+ nsIContentSecurityPolicy::VIOLATION_TYPE_REQUIRE_SRI_FOR_SCRIPT,
+ NS_ConvertUTF8toUTF16(violationURISpec),
+ EmptyString(), lineNo, EmptyString(), EmptyString());
+ rv = NS_ERROR_SRI_CORRUPT;
+ }
+ }
+
+ if (NS_SUCCEEDED(rv)) {
+ rv = PrepareLoadedRequest(request, aLoader, aChannelStatus, aString);
+ }
+
+ if (NS_FAILED(rv)) {
+ /*
+ * Handle script not loading error because source was a tracking URL.
+ * We make a note of this script node by including it in a dedicated
+ * array of blocked tracking nodes under its parent document.
+ */
+ if (rv == NS_ERROR_TRACKING_URI) {
+ nsCOMPtr<nsIContent> cont = do_QueryInterface(request->mElement);
+ mDocument->AddBlockedTrackingNode(cont);
+ }
+
+ if (request->mIsDefer) {
+ MOZ_ASSERT_IF(request->IsModuleRequest(),
+ request->AsModuleRequest()->IsTopLevel());
+ if (request->isInList()) {
+ RefPtr<ScriptLoadRequest> req = mDeferRequests.Steal(request);
+ FireScriptAvailable(rv, req);
+ }
+ } else if (request->mIsAsync) {
+ MOZ_ASSERT_IF(request->IsModuleRequest(),
+ request->AsModuleRequest()->IsTopLevel());
+ if (request->isInList()) {
+ RefPtr<ScriptLoadRequest> req = mLoadingAsyncRequests.Steal(request);
+ FireScriptAvailable(rv, req);
+ }
+ } else if (request->mIsNonAsyncScriptInserted) {
+ if (request->isInList()) {
+ RefPtr<ScriptLoadRequest> req =
+ mNonAsyncExternalScriptInsertedRequests.Steal(request);
+ FireScriptAvailable(rv, req);
+ }
+ } else if (request->mIsXSLT) {
+ if (request->isInList()) {
+ RefPtr<ScriptLoadRequest> req = mXSLTRequests.Steal(request);
+ FireScriptAvailable(rv, req);
+ }
+ } else if (request->IsModuleRequest()) {
+ ModuleLoadRequest* modReq = request->AsModuleRequest();
+ MOZ_ASSERT(!modReq->IsTopLevel());
+ MOZ_ASSERT(!modReq->isInList());
+ modReq->Cancel();
+ FireScriptAvailable(rv, request);
+ } else if (mParserBlockingRequest == request) {
+ MOZ_ASSERT(!request->isInList());
+ mParserBlockingRequest = nullptr;
+ UnblockParser(request);
+
+ // Ensure that we treat request->mElement as our current parser-inserted
+ // script while firing onerror on it.
+ MOZ_ASSERT(request->mElement->GetParserCreated());
+ nsCOMPtr<nsIScriptElement> oldParserInsertedScript =
+ mCurrentParserInsertedScript;
+ mCurrentParserInsertedScript = request->mElement;
+ FireScriptAvailable(rv, request);
+ ContinueParserAsync(request);
+ mCurrentParserInsertedScript = oldParserInsertedScript;
+ } else {
+ mPreloads.RemoveElement(request, PreloadRequestComparator());
+ }
+ }
+
+ // Process our request and/or any pending ones
+ ProcessPendingRequests();
+
+ return NS_OK;
+}
+
+void
+ScriptLoader::UnblockParser(ScriptLoadRequest* aParserBlockingRequest)
+{
+ aParserBlockingRequest->mElement->UnblockParser();
+}
+
+void
+ScriptLoader::ContinueParserAsync(ScriptLoadRequest* aParserBlockingRequest)
+{
+ aParserBlockingRequest->mElement->ContinueParserAsync();
+}
+
+uint32_t
+ScriptLoader::NumberOfProcessors()
+{
+ if (mNumberOfProcessors > 0)
+ return mNumberOfProcessors;
+
+ int32_t numProcs = PR_GetNumberOfProcessors();
+ if (numProcs > 0)
+ mNumberOfProcessors = numProcs;
+ return mNumberOfProcessors;
+}
+
+void
+ScriptLoader::MaybeMoveToLoadedList(ScriptLoadRequest* aRequest)
+{
+ MOZ_ASSERT(aRequest->IsReadyToRun());
+
+ // If it's async, move it to the loaded list. aRequest->mIsAsync really
+ // _should_ be in a list, but the consequences if it's not are bad enough we
+ // want to avoid trying to move it if it's not.
+ if (aRequest->mIsAsync) {
+ MOZ_ASSERT(aRequest->isInList());
+ if (aRequest->isInList()) {
+ RefPtr<ScriptLoadRequest> req = mLoadingAsyncRequests.Steal(aRequest);
+ mLoadedAsyncRequests.AppendElement(req);
+ }
+ }
+}
+
+nsresult
+ScriptLoader::PrepareLoadedRequest(ScriptLoadRequest* aRequest,
+ nsIIncrementalStreamLoader* aLoader,
+ nsresult aStatus,
+ mozilla::Vector<char16_t> &aString)
+{
+ if (NS_FAILED(aStatus)) {
+ return aStatus;
+ }
+
+ if (aRequest->IsCanceled()) {
+ return NS_BINDING_ABORTED;
+ }
+
+ // If we don't have a document, then we need to abort further
+ // evaluation.
+ if (!mDocument) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ // If the load returned an error page, then we need to abort
+ nsCOMPtr<nsIRequest> req;
+ nsresult rv = aLoader->GetRequest(getter_AddRefs(req));
+ NS_ASSERTION(req, "StreamLoader's request went away prematurely");
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(req);
+ if (httpChannel) {
+ bool requestSucceeded;
+ rv = httpChannel->GetRequestSucceeded(&requestSucceeded);
+ if (NS_SUCCEEDED(rv) && !requestSucceeded) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ nsAutoCString sourceMapURL;
+ rv = httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("SourceMap"), sourceMapURL);
+ if (NS_FAILED(rv)) {
+ rv = httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("X-SourceMap"), sourceMapURL);
+ }
+ if (NS_SUCCEEDED(rv)) {
+ aRequest->mHasSourceMapURL = true;
+ aRequest->mSourceMapURL = NS_ConvertUTF8toUTF16(sourceMapURL);
+ }
+ }
+
+ nsCOMPtr<nsIChannel> channel = do_QueryInterface(req);
+ // If this load was subject to a CORS check; don't flag it with a
+ // separate origin principal, so that it will treat our document's
+ // principal as the origin principal
+ if (aRequest->mCORSMode == CORS_NONE) {
+ rv = nsContentUtils::GetSecurityManager()->
+ GetChannelResultPrincipal(channel, getter_AddRefs(aRequest->mOriginPrincipal));
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ if (!aString.empty()) {
+ aRequest->mScriptTextLength = aString.length();
+ aRequest->mScriptTextBuf = aString.extractOrCopyRawBuffer();
+ }
+
+ // This assertion could fire errorously if we ran out of memory when
+ // inserting the request in the array. However it's an unlikely case
+ // so if you see this assertion it is likely something else that is
+ // wrong, especially if you see it more than once.
+ NS_ASSERTION(mDeferRequests.Contains(aRequest) ||
+ mLoadingAsyncRequests.Contains(aRequest) ||
+ mNonAsyncExternalScriptInsertedRequests.Contains(aRequest) ||
+ mXSLTRequests.Contains(aRequest) ||
+ (aRequest->IsModuleRequest() &&
+ !aRequest->AsModuleRequest()->IsTopLevel() &&
+ !aRequest->isInList()) ||
+ mPreloads.Contains(aRequest, PreloadRequestComparator()) ||
+ mParserBlockingRequest,
+ "aRequest should be pending!");
+
+ if (aRequest->IsModuleRequest()) {
+ ModuleLoadRequest* request = aRequest->AsModuleRequest();
+
+ // When loading a module, only responses with a JavaScript MIME type are
+ // acceptable.
+ nsAutoCString mimeType;
+ channel->GetContentType(mimeType);
+ NS_ConvertUTF8toUTF16 typeString(mimeType);
+ if (!nsContentUtils::IsJavascriptMIMEType(typeString)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ channel->GetURI(getter_AddRefs(request->mBaseURL));
+
+ // Attempt to compile off main thread.
+ rv = AttemptAsyncScriptCompile(request);
+ if (NS_SUCCEEDED(rv)) {
+ return rv;
+ }
+
+ // Otherwise compile it right away and start fetching descendents.
+ return ProcessFetchedModuleSource(request);
+ }
+
+ // The script is now loaded and ready to run.
+ aRequest->SetReady();
+
+ // If this is currently blocking the parser, attempt to compile it off-main-thread.
+ if (aRequest == mParserBlockingRequest && (NumberOfProcessors() > 1)) {
+ MOZ_ASSERT(!aRequest->IsModuleRequest());
+ nsresult rv = AttemptAsyncScriptCompile(aRequest);
+ if (rv == NS_OK) {
+ MOZ_ASSERT(aRequest->mProgress == ScriptLoadRequest::Progress::Compiling,
+ "Request should be off-thread compiling now.");
+ return NS_OK;
+ }
+
+ // If off-thread compile errored, return the error.
+ if (rv != NS_ERROR_FAILURE) {
+ return rv;
+ }
+
+ // If off-thread compile was rejected, continue with regular processing.
+ }
+
+ MaybeMoveToLoadedList(aRequest);
+
+ return NS_OK;
+}
+
+void
+ScriptLoader::ParsingComplete(bool aTerminated)
+{
+ if (mDeferEnabled) {
+ // Have to check because we apparently get ParsingComplete
+ // without BeginDeferringScripts in some cases
+ mDocumentParsingDone = true;
+ }
+ mDeferEnabled = false;
+ if (aTerminated) {
+ mDeferRequests.Clear();
+ mLoadingAsyncRequests.Clear();
+ mLoadedAsyncRequests.Clear();
+ mNonAsyncExternalScriptInsertedRequests.Clear();
+ mXSLTRequests.Clear();
+ if (mParserBlockingRequest) {
+ mParserBlockingRequest->Cancel();
+ mParserBlockingRequest = nullptr;
+ }
+ }
+
+ // Have to call this even if aTerminated so we'll correctly unblock
+ // onload and all.
+ ProcessPendingRequests();
+}
+
+void
+ScriptLoader::PreloadURI(nsIURI *aURI, const nsAString &aCharset,
+ const nsAString &aType,
+ const nsAString &aCrossOrigin,
+ const nsAString& aIntegrity,
+ bool aScriptFromHead,
+ const mozilla::net::ReferrerPolicy aReferrerPolicy)
+{
+ NS_ENSURE_TRUE_VOID(mDocument);
+ // Check to see if scripts has been turned off.
+ if (!mEnabled || !mDocument->IsScriptEnabled()) {
+ return;
+ }
+
+ // TODO: Preload module scripts.
+ if (ModuleScriptsEnabled() && aType.LowerCaseEqualsASCII("module")) {
+ return;
+ }
+
+ SRIMetadata sriMetadata;
+ if (!aIntegrity.IsEmpty()) {
+ MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
+ ("ScriptLoader::PreloadURI, integrity=%s",
+ NS_ConvertUTF16toUTF8(aIntegrity).get()));
+ nsAutoCString sourceUri;
+ if (mDocument->GetDocumentURI()) {
+ mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
+ }
+ SRICheck::IntegrityMetadata(aIntegrity, sourceUri, mReporter, &sriMetadata);
+ }
+
+ RefPtr<ScriptLoadRequest> request =
+ CreateLoadRequest(ScriptKind::Classic, nullptr, 0,
+ Element::StringToCORSMode(aCrossOrigin), sriMetadata);
+ request->mURI = aURI;
+ request->mIsInline = false;
+ request->mReferrerPolicy = aReferrerPolicy;
+
+ nsresult rv = StartLoad(request, aType, aScriptFromHead);
+ if (NS_FAILED(rv)) {
+ return;
+ }
+
+ PreloadInfo *pi = mPreloads.AppendElement();
+ pi->mRequest = request;
+ pi->mCharset = aCharset;
+}
+
+void
+ScriptLoader::AddDeferRequest(ScriptLoadRequest* aRequest)
+{
+ aRequest->mIsDefer = true;
+ mDeferRequests.AppendElement(aRequest);
+ if (mDeferEnabled && aRequest == mDeferRequests.getFirst() &&
+ mDocument && !mBlockingDOMContentLoaded) {
+ MOZ_ASSERT(mDocument->GetReadyStateEnum() == nsIDocument::READYSTATE_LOADING);
+ mBlockingDOMContentLoaded = true;
+ mDocument->BlockDOMContentLoaded();
+ }
+}
+
+bool
+ScriptLoader::MaybeRemovedDeferRequests()
+{
+ if (mDeferRequests.isEmpty() && mDocument &&
+ mBlockingDOMContentLoaded) {
+ mBlockingDOMContentLoaded = false;
+ mDocument->UnblockDOMContentLoaded();
+ return true;
+ }
+ return false;
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/script/ScriptLoader.h b/dom/script/ScriptLoader.h
new file mode 100644
index 000000000..e6b75bf3b
--- /dev/null
+++ b/dom/script/ScriptLoader.h
@@ -0,0 +1,669 @@
+/* -*- 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 "nsIUnicodeDecoder.h"
+#include "nsIScriptElement.h"
+#include "nsCOMArray.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsTArray.h"
+#include "nsAutoPtr.h"
+#include "nsIDocument.h"
+#include "nsIIncrementalStreamLoader.h"
+#include "nsURIHashKey.h"
+#include "mozilla/CORSMode.h"
+#include "mozilla/dom/SRIMetadata.h"
+#include "mozilla/dom/SRICheck.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/net/ReferrerPolicy.h"
+#include "mozilla/Vector.h"
+
+class nsIURI;
+
+namespace JS {
+ class SourceBufferHolder;
+} // namespace JS
+
+namespace mozilla {
+namespace dom {
+
+class AutoJSAPI;
+class ModuleLoadRequest;
+class ModuleScript;
+class ScriptLoadRequestList;
+
+//////////////////////////////////////////////////////////////
+// Per-request data structure
+//////////////////////////////////////////////////////////////
+
+enum class ScriptKind {
+ Classic,
+ Module
+};
+
+class ScriptLoadRequest : public nsISupports,
+ private mozilla::LinkedListElement<ScriptLoadRequest>
+{
+ typedef LinkedListElement<ScriptLoadRequest> super;
+
+ // Allow LinkedListElement<ScriptLoadRequest> to cast us to itself as needed.
+ friend class mozilla::LinkedListElement<ScriptLoadRequest>;
+ friend class ScriptLoadRequestList;
+
+protected:
+ virtual ~ScriptLoadRequest();
+
+public:
+ ScriptLoadRequest(ScriptKind aKind,
+ nsIScriptElement* aElement,
+ uint32_t aVersion,
+ mozilla::CORSMode aCORSMode,
+ const mozilla::dom::SRIMetadata &aIntegrity)
+ : mKind(aKind),
+ mElement(aElement),
+ mProgress(Progress::Loading),
+ mIsInline(true),
+ mHasSourceMapURL(false),
+ mIsDefer(false),
+ mIsAsync(false),
+ mIsNonAsyncScriptInserted(false),
+ mIsXSLT(false),
+ mIsCanceled(false),
+ mWasCompiledOMT(false),
+ mOffThreadToken(nullptr),
+ mScriptTextBuf(nullptr),
+ mScriptTextLength(0),
+ mJSVersion(aVersion),
+ mLineNo(1),
+ mCORSMode(aCORSMode),
+ mIntegrity(aIntegrity),
+ mReferrerPolicy(mozilla::net::RP_Default)
+ {
+ }
+
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_CLASS(ScriptLoadRequest)
+
+ bool IsModuleRequest() const
+ {
+ return mKind == ScriptKind::Module;
+ }
+
+ ModuleLoadRequest* AsModuleRequest();
+
+ void FireScriptAvailable(nsresult aResult)
+ {
+ mElement->ScriptAvailable(aResult, mElement, mIsInline, mURI, mLineNo);
+ }
+ void FireScriptEvaluated(nsresult aResult)
+ {
+ mElement->ScriptEvaluated(aResult, mElement, mIsInline);
+ }
+
+ bool IsPreload()
+ {
+ return mElement == nullptr;
+ }
+
+ virtual void Cancel();
+
+ bool IsCanceled() const
+ {
+ return mIsCanceled;
+ }
+
+ virtual void SetReady();
+
+ void** OffThreadTokenPtr()
+ {
+ return mOffThreadToken ? &mOffThreadToken : nullptr;
+ }
+
+ enum class Progress {
+ Loading,
+ Compiling,
+ FetchingImports,
+ Ready
+ };
+ bool IsReadyToRun() const {
+ return mProgress == Progress::Ready;
+ }
+ bool IsLoading() const {
+ return mProgress == Progress::Loading;
+ }
+ bool InCompilingStage() const {
+ return mProgress == Progress::Compiling ||
+ (IsReadyToRun() && mWasCompiledOMT);
+ }
+
+ void MaybeCancelOffThreadScript();
+
+ using super::getNext;
+ using super::isInList;
+
+ const ScriptKind mKind;
+ nsCOMPtr<nsIScriptElement> mElement;
+ Progress mProgress; // Are we still waiting for a load to complete?
+ bool mIsInline; // Is the script inline or loaded?
+ bool mHasSourceMapURL; // Does the HTTP header have a source map url?
+ bool mIsDefer; // True if we live in mDeferRequests.
+ bool mIsAsync; // True if we live in mLoadingAsyncRequests or mLoadedAsyncRequests.
+ bool mIsNonAsyncScriptInserted; // True if we live in mNonAsyncExternalScriptInsertedRequests
+ bool mIsXSLT; // True if we live in mXSLTRequests.
+ bool mIsCanceled; // True if we have been explicitly canceled.
+ bool mWasCompiledOMT; // True if the script has been compiled off main thread.
+ void* mOffThreadToken; // Off-thread parsing token.
+ nsString mSourceMapURL; // Holds source map url for loaded scripts
+ char16_t* mScriptTextBuf; // Holds script text for non-inline scripts. Don't
+ size_t mScriptTextLength; // use nsString so we can give ownership to jsapi.
+ uint32_t mJSVersion;
+ nsCOMPtr<nsIURI> mURI;
+ nsCOMPtr<nsIPrincipal> mOriginPrincipal;
+ nsAutoCString mURL; // Keep the URI's filename alive during off thread parsing.
+ int32_t mLineNo;
+ const mozilla::CORSMode mCORSMode;
+ const mozilla::dom::SRIMetadata mIntegrity;
+ mozilla::net::ReferrerPolicy mReferrerPolicy;
+};
+
+class ScriptLoadRequestList : private mozilla::LinkedList<ScriptLoadRequest>
+{
+ typedef mozilla::LinkedList<ScriptLoadRequest> super;
+
+public:
+ ~ScriptLoadRequestList();
+
+ void Clear();
+
+#ifdef DEBUG
+ bool Contains(ScriptLoadRequest* aElem) const;
+#endif // DEBUG
+
+ using super::getFirst;
+ using super::isEmpty;
+
+ void AppendElement(ScriptLoadRequest* aElem)
+ {
+ MOZ_ASSERT(!aElem->isInList());
+ NS_ADDREF(aElem);
+ insertBack(aElem);
+ }
+
+ MOZ_MUST_USE
+ already_AddRefed<ScriptLoadRequest> Steal(ScriptLoadRequest* aElem)
+ {
+ aElem->removeFrom(*this);
+ return dont_AddRef(aElem);
+ }
+
+ MOZ_MUST_USE
+ already_AddRefed<ScriptLoadRequest> StealFirst()
+ {
+ MOZ_ASSERT(!isEmpty());
+ return Steal(getFirst());
+ }
+
+ void Remove(ScriptLoadRequest* aElem)
+ {
+ aElem->removeFrom(*this);
+ NS_RELEASE(aElem);
+ }
+};
+class ScriptLoadHandler;
+
+//////////////////////////////////////////////////////////////
+// Script loader implementation
+//////////////////////////////////////////////////////////////
+
+class ScriptLoader final : public nsISupports
+{
+ class MOZ_STACK_CLASS AutoCurrentScriptUpdater
+ {
+ public:
+ AutoCurrentScriptUpdater(ScriptLoader* aScriptLoader,
+ nsIScriptElement* aCurrentScript)
+ : mOldScript(aScriptLoader->mCurrentScript)
+ , mScriptLoader(aScriptLoader)
+ {
+ mScriptLoader->mCurrentScript = aCurrentScript;
+ }
+ ~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(nsIDocument* 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.
+ * @param aChannel Channel corresponding to the data. May be null.
+ * @param aData The data to convert
+ * @param aLength Length of the data
+ * @param aHintCharset Hint for the character set (e.g., from a charset
+ * attribute). May be the empty string.
+ * @param aDocument Document which the data is loaded for. Must not be
+ * null.
+ * @param aBufOut [out] char16_t array allocated by ConvertToUTF16 and
+ * containing data converted to unicode. Caller must
+ * js_free() this data when no longer needed.
+ * @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,
+ nsIDocument* aDocument,
+ char16_t*& aBufOut, size_t& aLengthOut);
+
+ /**
+ * Handle the completion of a stream. This is called by the
+ * ScriptLoadHandler object which observes the IncrementalStreamLoader
+ * loading the script.
+ */
+ nsresult OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
+ nsISupports* aContext,
+ nsresult aChannelStatus,
+ nsresult aSRIStatus,
+ mozilla::Vector<char16_t> &aString,
+ mozilla::dom::SRICheckDataVerifier* aSRIDataVerifier);
+
+ /**
+ * 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,
+ 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;
+ }
+
+private:
+ virtual ~ScriptLoader();
+
+ ScriptLoadRequest* CreateLoadRequest(
+ ScriptKind aKind,
+ nsIScriptElement* aElement,
+ uint32_t aVersion,
+ mozilla::CORSMode aCORSMode,
+ const mozilla::dom::SRIMetadata &aIntegrity);
+
+ /**
+ * 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);
+
+
+ /**
+ * Helper function to check the content policy for a given request.
+ */
+ static nsresult CheckContentPolicy(nsIDocument* aDocument,
+ nsISupports *aContext,
+ nsIURI *aURI,
+ const nsAString &aType,
+ bool aIsPreLoad);
+
+ /**
+ * Start a load for aRequest's URI.
+ */
+ nsresult StartLoad(ScriptLoadRequest *aRequest, const nsAString &aType,
+ bool aScriptFromHead);
+
+ /**
+ * 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 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);
+ bool MaybeRemovedDeferRequests();
+
+ void MaybeMoveToLoadedList(ScriptLoadRequest* aRequest);
+
+ JS::SourceBufferHolder GetScriptSource(ScriptLoadRequest* aRequest,
+ nsAutoString& inlineData);
+
+ bool ModuleScriptsEnabled();
+
+ void SetModuleFetchStarted(ModuleLoadRequest *aRequest);
+ void SetModuleFetchFinishedAndResumeWaitingRequests(ModuleLoadRequest *aRequest,
+ nsresult aResult);
+
+ bool IsFetchingModule(ModuleLoadRequest *aRequest) const;
+
+ bool ModuleMapContainsModule(ModuleLoadRequest *aRequest) const;
+ RefPtr<mozilla::GenericPromise> WaitForModuleFetch(ModuleLoadRequest *aRequest);
+ ModuleScript* GetFetchedModule(nsIURI* aURL) const;
+
+ friend bool
+ HostResolveImportedModule(JSContext* aCx, unsigned argc, JS::Value* vp);
+
+ nsresult CreateModuleScript(ModuleLoadRequest* aRequest);
+ nsresult ProcessFetchedModuleSource(ModuleLoadRequest* aRequest);
+ void CheckModuleDependenciesLoaded(ModuleLoadRequest* aRequest);
+ void ProcessLoadedModuleTree(ModuleLoadRequest* aRequest);
+ bool InstantiateModuleTree(ModuleLoadRequest* aRequest);
+ void StartFetchingModuleDependencies(ModuleLoadRequest* aRequest);
+
+ RefPtr<mozilla::GenericPromise>
+ StartFetchingModuleAndDependencies(ModuleLoadRequest* aRequest, 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
diff --git a/dom/script/ScriptSettings.cpp b/dom/script/ScriptSettings.cpp
new file mode 100644
index 000000000..92ab221c9
--- /dev/null
+++ b/dom/script/ScriptSettings.cpp
@@ -0,0 +1,839 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/ThreadLocal.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/CycleCollectedJSContext.h"
+
+#include "jsapi.h"
+#include "xpcpublic.h"
+#include "nsIGlobalObject.h"
+#include "nsIDocShell.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsIScriptContext.h"
+#include "nsContentUtils.h"
+#include "nsGlobalWindow.h"
+#include "nsPIDOMWindow.h"
+#include "nsTArray.h"
+#include "nsJSUtils.h"
+#include "nsDOMJSUtils.h"
+#include "WorkerPrivate.h"
+
+namespace mozilla {
+namespace dom {
+
+static MOZ_THREAD_LOCAL(ScriptSettingsStackEntry*) sScriptSettingsTLS;
+static bool sScriptSettingsTLSInitialized;
+
+class ScriptSettingsStack {
+public:
+ static ScriptSettingsStackEntry* Top() {
+ return sScriptSettingsTLS.get();
+ }
+
+ static void Push(ScriptSettingsStackEntry *aEntry) {
+ MOZ_ASSERT(!aEntry->mOlder);
+ // Whenever JSAPI use is disabled, the next stack entry pushed must
+ // not be an AutoIncumbentScript.
+ MOZ_ASSERT_IF(!Top() || Top()->NoJSAPI(),
+ !aEntry->IsIncumbentScript());
+ // Whenever the top entry is not an incumbent canidate, the next stack entry
+ // pushed must not be an AutoIncumbentScript.
+ MOZ_ASSERT_IF(Top() && !Top()->IsIncumbentCandidate(),
+ !aEntry->IsIncumbentScript());
+
+ aEntry->mOlder = Top();
+ sScriptSettingsTLS.set(aEntry);
+ }
+
+ static void Pop(ScriptSettingsStackEntry *aEntry) {
+ MOZ_ASSERT(aEntry == Top());
+ sScriptSettingsTLS.set(aEntry->mOlder);
+ }
+
+ static nsIGlobalObject* IncumbentGlobal() {
+ ScriptSettingsStackEntry *entry = Top();
+ while (entry) {
+ if (entry->IsIncumbentCandidate()) {
+ return entry->mGlobalObject;
+ }
+ entry = entry->mOlder;
+ }
+ return nullptr;
+ }
+
+ static ScriptSettingsStackEntry* EntryPoint() {
+ ScriptSettingsStackEntry *entry = Top();
+ while (entry) {
+ if (entry->IsEntryCandidate()) {
+ return entry;
+ }
+ entry = entry->mOlder;
+ }
+ return nullptr;
+ }
+
+ static nsIGlobalObject* EntryGlobal() {
+ ScriptSettingsStackEntry *entry = EntryPoint();
+ if (!entry) {
+ return nullptr;
+ }
+ return entry->mGlobalObject;
+ }
+
+#ifdef DEBUG
+ static ScriptSettingsStackEntry* TopNonIncumbentScript() {
+ ScriptSettingsStackEntry *entry = Top();
+ while (entry) {
+ if (!entry->IsIncumbentScript()) {
+ return entry;
+ }
+ entry = entry->mOlder;
+ }
+ return nullptr;
+ }
+#endif // DEBUG
+
+};
+
+static unsigned long gRunToCompletionListeners = 0;
+
+void
+UseEntryScriptProfiling()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ ++gRunToCompletionListeners;
+}
+
+void
+UnuseEntryScriptProfiling()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_ASSERT(gRunToCompletionListeners > 0);
+ --gRunToCompletionListeners;
+}
+
+void
+InitScriptSettings()
+{
+ bool success = sScriptSettingsTLS.init();
+ if (!success) {
+ MOZ_CRASH();
+ }
+
+ sScriptSettingsTLS.set(nullptr);
+ sScriptSettingsTLSInitialized = true;
+}
+
+void
+DestroyScriptSettings()
+{
+ MOZ_ASSERT(sScriptSettingsTLS.get() == nullptr);
+}
+
+bool
+ScriptSettingsInitialized()
+{
+ return sScriptSettingsTLSInitialized;
+}
+
+ScriptSettingsStackEntry::ScriptSettingsStackEntry(nsIGlobalObject *aGlobal,
+ Type aType)
+ : mGlobalObject(aGlobal)
+ , mType(aType)
+ , mOlder(nullptr)
+{
+ MOZ_ASSERT_IF(IsIncumbentCandidate() && !NoJSAPI(), mGlobalObject);
+ MOZ_ASSERT(!mGlobalObject || mGlobalObject->GetGlobalJSObject(),
+ "Must have an actual JS global for the duration on the stack");
+ MOZ_ASSERT(!mGlobalObject ||
+ JS_IsGlobalObject(mGlobalObject->GetGlobalJSObject()),
+ "No outer windows allowed");
+}
+
+ScriptSettingsStackEntry::~ScriptSettingsStackEntry()
+{
+ // We must have an actual JS global for the entire time this is on the stack.
+ MOZ_ASSERT_IF(mGlobalObject, mGlobalObject->GetGlobalJSObject());
+}
+
+// If the entry or incumbent global ends up being something that the subject
+// principal doesn't subsume, we don't want to use it. This never happens on
+// the web, but can happen with asymmetric privilege relationships (i.e.
+// nsExpandedPrincipal and System Principal).
+//
+// The most correct thing to use instead would be the topmost global on the
+// callstack whose principal is subsumed by the subject principal. But that's
+// hard to compute, so we just substitute the global of the current
+// compartment. In practice, this is fine.
+//
+// Note that in particular things like:
+//
+// |SpecialPowers.wrap(crossOriginWindow).eval(open())|
+//
+// trigger this case. Although both the entry global and the current global
+// have normal principals, the use of Gecko-specific System-Principaled JS
+// puts the code from two different origins on the callstack at once, which
+// doesn't happen normally on the web.
+static nsIGlobalObject*
+ClampToSubject(nsIGlobalObject* aGlobalOrNull)
+{
+ if (!aGlobalOrNull || !NS_IsMainThread()) {
+ return aGlobalOrNull;
+ }
+
+ nsIPrincipal* globalPrin = aGlobalOrNull->PrincipalOrNull();
+ NS_ENSURE_TRUE(globalPrin, GetCurrentGlobal());
+ if (!nsContentUtils::SubjectPrincipalOrSystemIfNativeCaller()->SubsumesConsideringDomain(globalPrin)) {
+ return GetCurrentGlobal();
+ }
+
+ return aGlobalOrNull;
+}
+
+nsIGlobalObject*
+GetEntryGlobal()
+{
+ return ClampToSubject(ScriptSettingsStack::EntryGlobal());
+}
+
+nsIDocument*
+GetEntryDocument()
+{
+ nsIGlobalObject* global = GetEntryGlobal();
+ nsCOMPtr<nsPIDOMWindowInner> entryWin = do_QueryInterface(global);
+
+ // If our entry global isn't a window, see if it's an addon scope associated
+ // with a window. If it is, the caller almost certainly wants that rather
+ // than null.
+ if (!entryWin && global) {
+ if (auto* win = xpc::AddonWindowOrNull(global->GetGlobalJSObject())) {
+ entryWin = win->AsInner();
+ }
+ }
+
+ return entryWin ? entryWin->GetExtantDoc() : nullptr;
+}
+
+nsIGlobalObject*
+GetIncumbentGlobal()
+{
+ // We need the current JSContext in order to check the JS for
+ // scripted frames that may have appeared since anyone last
+ // manipulated the stack. If it's null, that means that there
+ // must be no entry global on the stack, and therefore no incumbent
+ // global either.
+ JSContext *cx = nsContentUtils::GetCurrentJSContextForThread();
+ if (!cx) {
+ MOZ_ASSERT(ScriptSettingsStack::EntryGlobal() == nullptr);
+ return nullptr;
+ }
+
+ // See what the JS engine has to say. If we've got a scripted caller
+ // override in place, the JS engine will lie to us and pretend that
+ // there's nothing on the JS stack, which will cause us to check the
+ // incumbent script stack below.
+ if (JSObject *global = JS::GetScriptedCallerGlobal(cx)) {
+ return ClampToSubject(xpc::NativeGlobal(global));
+ }
+
+ // Ok, nothing from the JS engine. Let's use whatever's on the
+ // explicit stack.
+ return ClampToSubject(ScriptSettingsStack::IncumbentGlobal());
+}
+
+nsIGlobalObject*
+GetCurrentGlobal()
+{
+ JSContext *cx = nsContentUtils::GetCurrentJSContextForThread();
+ if (!cx) {
+ return nullptr;
+ }
+
+ JSObject *global = JS::CurrentGlobalOrNull(cx);
+ if (!global) {
+ return nullptr;
+ }
+
+ return xpc::NativeGlobal(global);
+}
+
+nsIPrincipal*
+GetWebIDLCallerPrincipal()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ ScriptSettingsStackEntry *entry = ScriptSettingsStack::EntryPoint();
+
+ // If we have an entry point that is not NoJSAPI, we know it must be an
+ // AutoEntryScript.
+ if (!entry || entry->NoJSAPI()) {
+ return nullptr;
+ }
+ AutoEntryScript* aes = static_cast<AutoEntryScript*>(entry);
+
+ return aes->mWebIDLCallerPrincipal;
+}
+
+bool
+IsJSAPIActive()
+{
+ ScriptSettingsStackEntry* topEntry = ScriptSettingsStack::Top();
+ return topEntry && !topEntry->NoJSAPI();
+}
+
+namespace danger {
+JSContext*
+GetJSContext()
+{
+ return CycleCollectedJSContext::Get()->Context();
+}
+} // namespace danger
+
+JS::RootingContext*
+RootingCx()
+{
+ return CycleCollectedJSContext::Get()->RootingCx();
+}
+
+AutoJSAPI::AutoJSAPI()
+ : ScriptSettingsStackEntry(nullptr, eJSAPI)
+ , mCx(nullptr)
+ , mIsMainThread(false) // For lack of anything better
+{
+}
+
+AutoJSAPI::~AutoJSAPI()
+{
+ if (!mCx) {
+ // No need to do anything here: we never managed to Init, so can't have an
+ // exception on our (nonexistent) JSContext. We also don't need to restore
+ // any state on it. Finally, we never made it to pushing outselves onto the
+ // ScriptSettingsStack, so shouldn't pop.
+ MOZ_ASSERT(ScriptSettingsStack::Top() != this);
+ return;
+ }
+
+ ReportException();
+
+ if (mOldWarningReporter.isSome()) {
+ JS::SetWarningReporter(cx(), mOldWarningReporter.value());
+ }
+
+ // Leave the request before popping.
+ if (mIsMainThread) {
+ mAutoRequest.reset();
+ }
+
+ ScriptSettingsStack::Pop(this);
+}
+
+void
+WarningOnlyErrorReporter(JSContext* aCx, JSErrorReport* aRep);
+
+void
+AutoJSAPI::InitInternal(nsIGlobalObject* aGlobalObject, JSObject* aGlobal,
+ JSContext* aCx, bool aIsMainThread)
+{
+ MOZ_ASSERT(aCx);
+ MOZ_ASSERT(aCx == danger::GetJSContext());
+ MOZ_ASSERT(aIsMainThread == NS_IsMainThread());
+ MOZ_ASSERT(bool(aGlobalObject) == bool(aGlobal));
+ MOZ_ASSERT_IF(aGlobalObject, aGlobalObject->GetGlobalJSObject() == aGlobal);
+#ifdef DEBUG
+ bool haveException = JS_IsExceptionPending(aCx);
+#endif // DEBUG
+
+ mCx = aCx;
+ mIsMainThread = aIsMainThread;
+ mGlobalObject = aGlobalObject;
+ if (aIsMainThread) {
+ // We _could_ just unconditionally emplace mAutoRequest here. It's just not
+ // needed on worker threads, and we're hoping to kill it on the main thread
+ // too.
+ mAutoRequest.emplace(mCx);
+ }
+ if (aGlobal) {
+ JS::ExposeObjectToActiveJS(aGlobal);
+ }
+ mAutoNullableCompartment.emplace(mCx, aGlobal);
+
+ ScriptSettingsStack::Push(this);
+
+ mOldWarningReporter.emplace(JS::GetWarningReporter(aCx));
+
+ JS::SetWarningReporter(aCx, WarningOnlyErrorReporter);
+
+#ifdef DEBUG
+ if (haveException) {
+ JS::Rooted<JS::Value> exn(aCx);
+ JS_GetPendingException(aCx, &exn);
+
+ JS_ClearPendingException(aCx);
+ if (exn.isObject()) {
+ JS::Rooted<JSObject*> exnObj(aCx, &exn.toObject());
+
+ nsAutoJSString stack, filename, name, message;
+ int32_t line;
+
+ JS::Rooted<JS::Value> tmp(aCx);
+ if (!JS_GetProperty(aCx, exnObj, "filename", &tmp)) {
+ JS_ClearPendingException(aCx);
+ }
+ if (tmp.isUndefined()) {
+ if (!JS_GetProperty(aCx, exnObj, "fileName", &tmp)) {
+ JS_ClearPendingException(aCx);
+ }
+ }
+
+ if (!filename.init(aCx, tmp)) {
+ JS_ClearPendingException(aCx);
+ }
+
+ if (!JS_GetProperty(aCx, exnObj, "stack", &tmp) ||
+ !stack.init(aCx, tmp)) {
+ JS_ClearPendingException(aCx);
+ }
+
+ if (!JS_GetProperty(aCx, exnObj, "name", &tmp) ||
+ !name.init(aCx, tmp)) {
+ JS_ClearPendingException(aCx);
+ }
+
+ if (!JS_GetProperty(aCx, exnObj, "message", &tmp) ||
+ !message.init(aCx, tmp)) {
+ JS_ClearPendingException(aCx);
+ }
+
+ if (!JS_GetProperty(aCx, exnObj, "lineNumber", &tmp) ||
+ !JS::ToInt32(aCx, tmp, &line)) {
+ JS_ClearPendingException(aCx);
+ line = 0;
+ }
+
+ printf_stderr("PREEXISTING EXCEPTION OBJECT: '%s: %s'\n%s:%d\n%s\n",
+ NS_ConvertUTF16toUTF8(name).get(),
+ NS_ConvertUTF16toUTF8(message).get(),
+ NS_ConvertUTF16toUTF8(filename).get(), line,
+ NS_ConvertUTF16toUTF8(stack).get());
+ } else {
+ // It's a primitive... not much we can do other than stringify it.
+ nsAutoJSString exnStr;
+ if (!exnStr.init(aCx, exn)) {
+ JS_ClearPendingException(aCx);
+ }
+
+ printf_stderr("PREEXISTING EXCEPTION PRIMITIVE: %s\n",
+ NS_ConvertUTF16toUTF8(exnStr).get());
+ }
+ MOZ_ASSERT(false, "We had an exception; we should not have");
+ }
+#endif // DEBUG
+}
+
+AutoJSAPI::AutoJSAPI(nsIGlobalObject* aGlobalObject,
+ bool aIsMainThread,
+ Type aType)
+ : ScriptSettingsStackEntry(aGlobalObject, aType)
+ , mIsMainThread(aIsMainThread)
+{
+ MOZ_ASSERT(aGlobalObject);
+ MOZ_ASSERT(aGlobalObject->GetGlobalJSObject(), "Must have a JS global");
+ MOZ_ASSERT(aIsMainThread == NS_IsMainThread());
+
+ InitInternal(aGlobalObject, aGlobalObject->GetGlobalJSObject(),
+ danger::GetJSContext(), aIsMainThread);
+}
+
+void
+AutoJSAPI::Init()
+{
+ MOZ_ASSERT(!mCx, "An AutoJSAPI should only be initialised once");
+
+ InitInternal(/* aGlobalObject */ nullptr, /* aGlobal */ nullptr,
+ danger::GetJSContext(), NS_IsMainThread());
+}
+
+bool
+AutoJSAPI::Init(nsIGlobalObject* aGlobalObject, JSContext* aCx)
+{
+ MOZ_ASSERT(!mCx, "An AutoJSAPI should only be initialised once");
+ MOZ_ASSERT(aCx);
+
+ if (NS_WARN_IF(!aGlobalObject)) {
+ return false;
+ }
+
+ JSObject* global = aGlobalObject->GetGlobalJSObject();
+ if (NS_WARN_IF(!global)) {
+ return false;
+ }
+
+ InitInternal(aGlobalObject, global, aCx, NS_IsMainThread());
+ return true;
+}
+
+bool
+AutoJSAPI::Init(nsIGlobalObject* aGlobalObject)
+{
+ return Init(aGlobalObject, danger::GetJSContext());
+}
+
+bool
+AutoJSAPI::Init(JSObject* aObject)
+{
+ nsIGlobalObject* global = nullptr;
+ if (aObject)
+ global = xpc::NativeGlobal(aObject);
+ if (global)
+ return Init(global);
+ else
+ return false;
+}
+
+bool
+AutoJSAPI::Init(nsPIDOMWindowInner* aWindow, JSContext* aCx)
+{
+ return Init(nsGlobalWindow::Cast(aWindow), aCx);
+}
+
+bool
+AutoJSAPI::Init(nsPIDOMWindowInner* aWindow)
+{
+ return Init(nsGlobalWindow::Cast(aWindow));
+}
+
+bool
+AutoJSAPI::Init(nsGlobalWindow* aWindow, JSContext* aCx)
+{
+ return Init(static_cast<nsIGlobalObject*>(aWindow), aCx);
+}
+
+bool
+AutoJSAPI::Init(nsGlobalWindow* aWindow)
+{
+ return Init(static_cast<nsIGlobalObject*>(aWindow));
+}
+
+// Even with autoJSAPIOwnsErrorReporting, the JS engine still sends warning
+// reports to the JSErrorReporter as soon as they are generated. These go
+// directly to the console, so we can handle them easily here.
+//
+// Eventually, SpiderMonkey will have a special-purpose callback for warnings
+// only.
+void
+WarningOnlyErrorReporter(JSContext* aCx, JSErrorReport* aRep)
+{
+ MOZ_ASSERT(JSREPORT_IS_WARNING(aRep->flags));
+ if (!NS_IsMainThread()) {
+ // Reporting a warning on workers is a bit complicated because we have to
+ // climb our parent chain until we get to the main thread. So go ahead and
+ // just go through the worker ReportError codepath here.
+ //
+ // That said, it feels like we should be able to short-circuit things a bit
+ // here by posting an appropriate runnable to the main thread directly...
+ // Worth looking into sometime.
+ workers::WorkerPrivate* worker = workers::GetWorkerPrivateFromContext(aCx);
+ MOZ_ASSERT(worker);
+
+ worker->ReportError(aCx, JS::ConstUTF8CharsZ(), aRep);
+ return;
+ }
+
+ RefPtr<xpc::ErrorReport> xpcReport = new xpc::ErrorReport();
+ nsGlobalWindow* win = xpc::CurrentWindowOrNull(aCx);
+ if (!win) {
+ // We run addons in a separate privileged compartment, but if we're in an
+ // addon compartment we should log warnings to the console of the associated
+ // DOM Window.
+ win = xpc::AddonWindowOrNull(JS::CurrentGlobalOrNull(aCx));
+ }
+ xpcReport->Init(aRep, nullptr, nsContentUtils::IsCallerChrome(),
+ win ? win->AsInner()->WindowID() : 0);
+ xpcReport->LogToConsole();
+}
+
+void
+AutoJSAPI::ReportException()
+{
+ if (!HasException()) {
+ return;
+ }
+
+ // AutoJSAPI uses a JSAutoNullableCompartment, and may be in a null
+ // compartment when the destructor is called. However, the JS engine
+ // requires us to be in a compartment when we fetch the pending exception.
+ // In this case, we enter the privileged junk scope and don't dispatch any
+ // error events.
+ JS::Rooted<JSObject*> errorGlobal(cx(), JS::CurrentGlobalOrNull(cx()));
+ if (!errorGlobal) {
+ if (mIsMainThread) {
+ errorGlobal = xpc::PrivilegedJunkScope();
+ } else {
+ errorGlobal = workers::GetCurrentThreadWorkerGlobal();
+ }
+ }
+ JSAutoCompartment ac(cx(), errorGlobal);
+ JS::Rooted<JS::Value> exn(cx());
+ js::ErrorReport jsReport(cx());
+ if (StealException(&exn) &&
+ jsReport.init(cx(), exn, js::ErrorReport::WithSideEffects)) {
+ if (mIsMainThread) {
+ RefPtr<xpc::ErrorReport> xpcReport = new xpc::ErrorReport();
+
+ RefPtr<nsGlobalWindow> win = xpc::WindowGlobalOrNull(errorGlobal);
+ if (!win) {
+ // We run addons in a separate privileged compartment, but they still
+ // expect to trigger the onerror handler of their associated DOM Window.
+ win = xpc::AddonWindowOrNull(errorGlobal);
+ }
+ nsPIDOMWindowInner* inner = win ? win->AsInner() : nullptr;
+ xpcReport->Init(jsReport.report(), jsReport.toStringResult().c_str(),
+ nsContentUtils::IsCallerChrome(),
+ inner ? inner->WindowID() : 0);
+ if (inner && jsReport.report()->errorNumber != JSMSG_OUT_OF_MEMORY) {
+ JS::RootingContext* rcx = JS::RootingContext::get(cx());
+ DispatchScriptErrorEvent(inner, rcx, xpcReport, exn);
+ } else {
+ JS::Rooted<JSObject*> stack(cx(),
+ xpc::FindExceptionStackForConsoleReport(inner, exn));
+ xpcReport->LogToConsoleWithStack(stack);
+ }
+ } else {
+ // On a worker, we just use the worker error reporting mechanism and don't
+ // bother with xpc::ErrorReport. This will ensure that all the right
+ // events (which are a lot more complicated than in the window case) get
+ // fired.
+ workers::WorkerPrivate* worker = workers::GetCurrentThreadWorkerPrivate();
+ MOZ_ASSERT(worker);
+ MOZ_ASSERT(worker->GetJSContext() == cx());
+ // Before invoking ReportError, put the exception back on the context,
+ // because it may want to put it in its error events and has no other way
+ // to get hold of it. After we invoke ReportError, clear the exception on
+ // cx(), just in case ReportError didn't.
+ JS_SetPendingException(cx(), exn);
+ worker->ReportError(cx(), jsReport.toStringResult(), jsReport.report());
+ ClearException();
+ }
+ } else {
+ NS_WARNING("OOMed while acquiring uncaught exception from JSAPI");
+ ClearException();
+ }
+}
+
+bool
+AutoJSAPI::PeekException(JS::MutableHandle<JS::Value> aVal)
+{
+ MOZ_ASSERT_IF(mIsMainThread, IsStackTop());
+ MOZ_ASSERT(HasException());
+ MOZ_ASSERT(js::GetContextCompartment(cx()));
+ if (!JS_GetPendingException(cx(), aVal)) {
+ return false;
+ }
+ return true;
+}
+
+bool
+AutoJSAPI::StealException(JS::MutableHandle<JS::Value> aVal)
+{
+ if (!PeekException(aVal)) {
+ return false;
+ }
+ JS_ClearPendingException(cx());
+ return true;
+}
+
+#ifdef DEBUG
+bool
+AutoJSAPI::IsStackTop() const
+{
+ return ScriptSettingsStack::TopNonIncumbentScript() == this;
+}
+#endif // DEBUG
+
+AutoEntryScript::AutoEntryScript(nsIGlobalObject* aGlobalObject,
+ const char *aReason,
+ bool aIsMainThread)
+ : AutoJSAPI(aGlobalObject, aIsMainThread, eEntryScript)
+ , mWebIDLCallerPrincipal(nullptr)
+{
+ MOZ_ASSERT(aGlobalObject);
+
+ if (aIsMainThread && gRunToCompletionListeners > 0) {
+ mDocShellEntryMonitor.emplace(cx(), aReason);
+ }
+}
+
+AutoEntryScript::AutoEntryScript(JSObject* aObject,
+ const char *aReason,
+ bool aIsMainThread)
+ : AutoEntryScript(xpc::NativeGlobal(aObject), aReason, aIsMainThread)
+{
+}
+
+AutoEntryScript::~AutoEntryScript()
+{
+ // GC when we pop a script entry point. This is a useful heuristic that helps
+ // us out on certain (flawed) benchmarks like sunspider, because it lets us
+ // avoid GCing during the timing loop.
+ JS_MaybeGC(cx());
+}
+
+AutoEntryScript::DocshellEntryMonitor::DocshellEntryMonitor(JSContext* aCx,
+ const char* aReason)
+ : JS::dbg::AutoEntryMonitor(aCx)
+ , mReason(aReason)
+{
+}
+
+void
+AutoEntryScript::DocshellEntryMonitor::Entry(JSContext* aCx, JSFunction* aFunction,
+ JSScript* aScript, JS::Handle<JS::Value> aAsyncStack,
+ const char* aAsyncCause)
+{
+ JS::Rooted<JSFunction*> rootedFunction(aCx);
+ if (aFunction) {
+ rootedFunction = aFunction;
+ }
+ JS::Rooted<JSScript*> rootedScript(aCx);
+ if (aScript) {
+ rootedScript = aScript;
+ }
+
+ nsCOMPtr<nsPIDOMWindowInner> window =
+ do_QueryInterface(xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx)));
+ if (!window || !window->GetDocShell() ||
+ !window->GetDocShell()->GetRecordProfileTimelineMarkers()) {
+ return;
+ }
+
+ nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
+ nsString filename;
+ uint32_t lineNumber = 0;
+
+ js::AutoStableStringChars functionName(aCx);
+ if (rootedFunction) {
+ JS::Rooted<JSString*> displayId(aCx, JS_GetFunctionDisplayId(rootedFunction));
+ if (displayId) {
+ if (!functionName.initTwoByte(aCx, displayId)) {
+ JS_ClearPendingException(aCx);
+ return;
+ }
+ }
+ }
+
+ if (!rootedScript) {
+ rootedScript = JS_GetFunctionScript(aCx, rootedFunction);
+ }
+ if (rootedScript) {
+ filename = NS_ConvertUTF8toUTF16(JS_GetScriptFilename(rootedScript));
+ lineNumber = JS_GetScriptBaseLineNumber(aCx, rootedScript);
+ }
+
+ if (!filename.IsEmpty() || functionName.isTwoByte()) {
+ const char16_t* functionNameChars = functionName.isTwoByte() ?
+ functionName.twoByteChars() : nullptr;
+
+ docShellForJSRunToCompletion->NotifyJSRunToCompletionStart(mReason,
+ functionNameChars,
+ filename.BeginReading(),
+ lineNumber, aAsyncStack,
+ aAsyncCause);
+ }
+}
+
+void
+AutoEntryScript::DocshellEntryMonitor::Exit(JSContext* aCx)
+{
+ nsCOMPtr<nsPIDOMWindowInner> window =
+ do_QueryInterface(xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx)));
+ // Not really worth checking GetRecordProfileTimelineMarkers here.
+ if (window && window->GetDocShell()) {
+ nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
+ docShellForJSRunToCompletion->NotifyJSRunToCompletionStop();
+ }
+}
+
+AutoIncumbentScript::AutoIncumbentScript(nsIGlobalObject* aGlobalObject)
+ : ScriptSettingsStackEntry(aGlobalObject, eIncumbentScript)
+ , mCallerOverride(nsContentUtils::GetCurrentJSContextForThread())
+{
+ ScriptSettingsStack::Push(this);
+}
+
+AutoIncumbentScript::~AutoIncumbentScript()
+{
+ ScriptSettingsStack::Pop(this);
+}
+
+AutoNoJSAPI::AutoNoJSAPI()
+ : ScriptSettingsStackEntry(nullptr, eNoJSAPI)
+{
+ ScriptSettingsStack::Push(this);
+}
+
+AutoNoJSAPI::~AutoNoJSAPI()
+{
+ ScriptSettingsStack::Pop(this);
+}
+
+} // namespace dom
+
+AutoJSContext::AutoJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
+ : mCx(nullptr)
+{
+ JS::AutoSuppressGCAnalysis nogc;
+ MOZ_ASSERT(!mCx, "mCx should not be initialized!");
+ MOZ_ASSERT(NS_IsMainThread());
+
+ MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+
+ if (dom::IsJSAPIActive()) {
+ mCx = dom::danger::GetJSContext();
+ } else {
+ mJSAPI.Init();
+ mCx = mJSAPI.cx();
+ }
+}
+
+AutoJSContext::operator JSContext*() const
+{
+ return mCx;
+}
+
+AutoSafeJSContext::AutoSafeJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
+ : AutoJSAPI()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+
+ MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+
+ DebugOnly<bool> ok = Init(xpc::UnprivilegedJunkScope());
+ MOZ_ASSERT(ok,
+ "This is quite odd. We should have crashed in the "
+ "xpc::NativeGlobal() call if xpc::UnprivilegedJunkScope() "
+ "returned null, and inited correctly otherwise!");
+}
+
+AutoSlowOperation::AutoSlowOperation(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
+ : AutoJSAPI()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+
+ MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+
+ Init();
+}
+
+void
+AutoSlowOperation::CheckForInterrupt()
+{
+ // JS_CheckForInterrupt expects us to be in a compartment.
+ JSAutoCompartment ac(cx(), xpc::UnprivilegedJunkScope());
+ JS_CheckForInterrupt(cx());
+}
+
+} // namespace mozilla
diff --git a/dom/script/ScriptSettings.h b/dom/script/ScriptSettings.h
new file mode 100644
index 000000000..05e62f55e
--- /dev/null
+++ b/dom/script/ScriptSettings.h
@@ -0,0 +1,465 @@
+/* -*- 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/. */
+
+/* Utilities for managing the script settings object stack defined in webapps */
+
+#ifndef mozilla_dom_ScriptSettings_h
+#define mozilla_dom_ScriptSettings_h
+
+#include "MainThreadUtils.h"
+#include "nsIGlobalObject.h"
+#include "nsIPrincipal.h"
+
+#include "mozilla/Maybe.h"
+
+#include "jsapi.h"
+#include "js/Debug.h"
+
+class nsPIDOMWindowInner;
+class nsGlobalWindow;
+class nsIScriptContext;
+class nsIDocument;
+class nsIDocShell;
+
+namespace mozilla {
+namespace dom {
+
+/*
+ * System-wide setup/teardown routines. Init and Destroy should be invoked
+ * once each, at startup and shutdown (respectively).
+ */
+void InitScriptSettings();
+void DestroyScriptSettings();
+bool ScriptSettingsInitialized();
+
+/*
+ * Static helpers in ScriptSettings which track the number of listeners
+ * of Javascript RunToCompletion events. These should be used by the code in
+ * nsDocShell::SetRecordProfileTimelineMarkers to indicate to script
+ * settings that script run-to-completion needs to be monitored.
+ * SHOULD BE CALLED ONLY BY MAIN THREAD.
+ */
+void UseEntryScriptProfiling();
+void UnuseEntryScriptProfiling();
+
+// To implement a web-compatible browser, it is often necessary to obtain the
+// global object that is "associated" with the currently-running code. This
+// process is made more complicated by the fact that, historically, different
+// algorithms have operated with different definitions of the "associated"
+// global.
+//
+// HTML5 formalizes this into two concepts: the "incumbent global" and the
+// "entry global". The incumbent global corresponds to the global of the
+// current script being executed, whereas the entry global corresponds to the
+// global of the script where the current JS execution began.
+//
+// There is also a potentially-distinct third global that is determined by the
+// current compartment. This roughly corresponds with the notion of Realms in
+// ECMAScript.
+//
+// Suppose some event triggers an event listener in window |A|, which invokes a
+// scripted function in window |B|, which invokes the |window.location.href|
+// setter in window |C|. The entry global would be |A|, the incumbent global
+// would be |B|, and the current compartment would be that of |C|.
+//
+// In general, it's best to use to use the most-closely-associated global
+// unless the spec says to do otherwise. In 95% of the cases, the global of
+// the current compartment (GetCurrentGlobal()) is the right thing. For
+// example, WebIDL constructors (new C.XMLHttpRequest()) are initialized with
+// the global of the current compartment (i.e. |C|).
+//
+// The incumbent global is very similar, but differs in a few edge cases. For
+// example, if window |B| does |C.location.href = "..."|, the incumbent global
+// used for the navigation algorithm is B, because no script from |C| was ever run.
+//
+// The entry global is used for various things like computing base URIs, mostly
+// for historical reasons.
+//
+// Note that all of these functions return bonafide global objects. This means
+// that, for Windows, they always return the inner.
+
+// Returns the global associated with the top-most Candidate Entry Point on
+// the Script Settings Stack. See the HTML spec. This may be null.
+nsIGlobalObject* GetEntryGlobal();
+
+// If the entry global is a window, returns its extant document. Otherwise,
+// returns null.
+nsIDocument* GetEntryDocument();
+
+// Returns the global associated with the top-most entry of the the Script
+// Settings Stack. See the HTML spec. This may be null.
+nsIGlobalObject* GetIncumbentGlobal();
+
+// Returns the global associated with the current compartment. This may be null.
+nsIGlobalObject* GetCurrentGlobal();
+
+// JS-implemented WebIDL presents an interesting situation with respect to the
+// subject principal. A regular C++-implemented API can simply examine the
+// compartment of the most-recently-executed script, and use that to infer the
+// responsible party. However, JS-implemented APIs are run with system
+// principal, and thus clobber the subject principal of the script that
+// invoked the API. So we have to do some extra work to keep track of this
+// information.
+//
+// We therefore implement the following behavior:
+// * Each Script Settings Object has an optional WebIDL Caller Principal field.
+// This defaults to null.
+// * When we push an Entry Point in preparation to run a JS-implemented WebIDL
+// callback, we grab the subject principal at the time of invocation, and
+// store that as the WebIDL Caller Principal.
+// * When non-null, callers can query this principal from script via an API on
+// Components.utils.
+nsIPrincipal* GetWebIDLCallerPrincipal();
+
+// This may be used by callers that know that their incumbent global is non-
+// null (i.e. they know there have been no System Caller pushes since the
+// inner-most script execution).
+inline JSObject& IncumbentJSGlobal()
+{
+ return *GetIncumbentGlobal()->GetGlobalJSObject();
+}
+
+// Returns whether JSAPI is active right now. If it is not, working with a
+// JSContext you grab from somewhere random is not OK and you should be doing
+// AutoJSAPI or AutoEntryScript to get yourself a properly set up JSContext.
+bool IsJSAPIActive();
+
+namespace danger {
+
+// Get the JSContext for this thread. This is in the "danger" namespace because
+// we generally want people using AutoJSAPI instead, unless they really know
+// what they're doing.
+JSContext* GetJSContext();
+
+} // namespace danger
+
+JS::RootingContext* RootingCx();
+
+class ScriptSettingsStack;
+class ScriptSettingsStackEntry {
+ friend class ScriptSettingsStack;
+
+public:
+ ~ScriptSettingsStackEntry();
+
+ bool NoJSAPI() const { return mType == eNoJSAPI; }
+ bool IsEntryCandidate() const {
+ return mType == eEntryScript || mType == eNoJSAPI;
+ }
+ bool IsIncumbentCandidate() { return mType != eJSAPI; }
+ bool IsIncumbentScript() { return mType == eIncumbentScript; }
+
+protected:
+ enum Type {
+ eEntryScript,
+ eIncumbentScript,
+ eJSAPI,
+ eNoJSAPI
+ };
+
+ ScriptSettingsStackEntry(nsIGlobalObject *aGlobal,
+ Type aEntryType);
+
+ nsCOMPtr<nsIGlobalObject> mGlobalObject;
+ Type mType;
+
+private:
+ ScriptSettingsStackEntry *mOlder;
+};
+
+/*
+ * For any interaction with JSAPI, an AutoJSAPI (or one of its subclasses)
+ * must be on the stack.
+ *
+ * This base class should be instantiated as-is when the caller wants to use
+ * JSAPI but doesn't expect to run script. The caller must then call one of its
+ * Init functions before being able to access the JSContext through cx().
+ * Its current duties are as-follows (see individual Init comments for details):
+ *
+ * * Grabbing an appropriate JSContext, and, on the main thread, pushing it onto
+ * the JSContext stack.
+ * * Entering an initial (possibly null) compartment, to ensure that the
+ * previously entered compartment for that JSContext is not used by mistake.
+ * * Reporting any exceptions left on the JSRuntime, unless the caller steals
+ * or silences them.
+ * * On main thread, entering a JSAutoRequest.
+ *
+ * Additionally, the following duties are planned, but not yet implemented:
+ *
+ * * De-poisoning the JSRuntime to allow manipulation of JSAPI. This requires
+ * implementing the poisoning first. For now, this de-poisoning
+ * effectively corresponds to having a non-null cx on the stack.
+ *
+ * In situations where the consumer expects to run script, AutoEntryScript
+ * should be used, which does additional manipulation of the script settings
+ * stack. In bug 991758, we'll add hard invariants to SpiderMonkey, such that
+ * any attempt to run script without an AutoEntryScript on the stack will
+ * fail. This prevents system code from accidentally triggering script
+ * execution at inopportune moments via surreptitious getters and proxies.
+ */
+class MOZ_STACK_CLASS AutoJSAPI : protected ScriptSettingsStackEntry {
+public:
+ // Trivial constructor. One of the Init functions must be called before
+ // accessing the JSContext through cx().
+ AutoJSAPI();
+
+ ~AutoJSAPI();
+
+ // This uses the SafeJSContext (or worker equivalent), and enters a null
+ // compartment, so that the consumer is forced to select a compartment to
+ // enter before manipulating objects.
+ //
+ // This variant will ensure that any errors reported by this AutoJSAPI as it
+ // comes off the stack will not fire error events or be associated with any
+ // particular web-visible global.
+ void Init();
+
+ // This uses the SafeJSContext (or worker equivalent), and enters the
+ // compartment of aGlobalObject.
+ // If aGlobalObject or its associated JS global are null then it returns
+ // false and use of cx() will cause an assertion.
+ //
+ // If aGlobalObject represents a web-visible global, errors reported by this
+ // AutoJSAPI as it comes off the stack will fire the relevant error events and
+ // show up in the corresponding web console.
+ MOZ_MUST_USE bool Init(nsIGlobalObject* aGlobalObject);
+
+ // This is a helper that grabs the native global associated with aObject and
+ // invokes the above Init() with that.
+ MOZ_MUST_USE bool Init(JSObject* aObject);
+
+ // Unsurprisingly, this uses aCx and enters the compartment of aGlobalObject.
+ // If aGlobalObject or its associated JS global are null then it returns
+ // false and use of cx() will cause an assertion.
+ // If aCx is null it will cause an assertion.
+ //
+ // If aGlobalObject represents a web-visible global, errors reported by this
+ // AutoJSAPI as it comes off the stack will fire the relevant error events and
+ // show up in the corresponding web console.
+ MOZ_MUST_USE bool Init(nsIGlobalObject* aGlobalObject, JSContext* aCx);
+
+ // Convenience functions to take an nsPIDOMWindow* or nsGlobalWindow*,
+ // when it is more easily available than an nsIGlobalObject.
+ MOZ_MUST_USE bool Init(nsPIDOMWindowInner* aWindow);
+ MOZ_MUST_USE bool Init(nsPIDOMWindowInner* aWindow, JSContext* aCx);
+
+ MOZ_MUST_USE bool Init(nsGlobalWindow* aWindow);
+ MOZ_MUST_USE bool Init(nsGlobalWindow* aWindow, JSContext* aCx);
+
+ JSContext* cx() const {
+ MOZ_ASSERT(mCx, "Must call Init before using an AutoJSAPI");
+ MOZ_ASSERT(IsStackTop());
+ return mCx;
+ }
+
+#ifdef DEBUG
+ bool IsStackTop() const;
+#endif
+
+ // If HasException, report it. Otherwise, a no-op.
+ void ReportException();
+
+ bool HasException() const {
+ MOZ_ASSERT(IsStackTop());
+ return JS_IsExceptionPending(cx());
+ };
+
+ // Transfers ownership of the current exception from the JS engine to the
+ // caller. Callers must ensure that HasException() is true, and that cx()
+ // is in a non-null compartment.
+ //
+ // Note that this fails if and only if we OOM while wrapping the exception
+ // into the current compartment.
+ MOZ_MUST_USE bool StealException(JS::MutableHandle<JS::Value> aVal);
+
+ // Peek the current exception from the JS engine, without stealing it.
+ // Callers must ensure that HasException() is true, and that cx() is in a
+ // non-null compartment.
+ //
+ // Note that this fails if and only if we OOM while wrapping the exception
+ // into the current compartment.
+ MOZ_MUST_USE bool PeekException(JS::MutableHandle<JS::Value> aVal);
+
+ void ClearException() {
+ MOZ_ASSERT(IsStackTop());
+ JS_ClearPendingException(cx());
+ }
+
+protected:
+ // Protected constructor for subclasses. This constructor initialises the
+ // AutoJSAPI, so Init must NOT be called on subclasses that use this.
+ AutoJSAPI(nsIGlobalObject* aGlobalObject, bool aIsMainThread, Type aType);
+
+private:
+ mozilla::Maybe<JSAutoRequest> mAutoRequest;
+ mozilla::Maybe<JSAutoNullableCompartment> mAutoNullableCompartment;
+ JSContext *mCx;
+
+ // Whether we're mainthread or not; set when we're initialized.
+ bool mIsMainThread;
+ Maybe<JS::WarningReporter> mOldWarningReporter;
+
+ void InitInternal(nsIGlobalObject* aGlobalObject, JSObject* aGlobal,
+ JSContext* aCx, bool aIsMainThread);
+
+ AutoJSAPI(const AutoJSAPI&) = delete;
+ AutoJSAPI& operator= (const AutoJSAPI&) = delete;
+};
+
+/*
+ * A class that represents a new script entry point.
+ *
+ * |aReason| should be a statically-allocated C string naming the reason we're
+ * invoking JavaScript code: "setTimeout", "event", and so on. The devtools use
+ * these strings to label JS execution in timeline and profiling displays.
+ */
+class MOZ_STACK_CLASS AutoEntryScript : public AutoJSAPI {
+public:
+ AutoEntryScript(nsIGlobalObject* aGlobalObject,
+ const char *aReason,
+ bool aIsMainThread = NS_IsMainThread());
+
+ AutoEntryScript(JSObject* aObject, // Any object from the relevant global
+ const char *aReason,
+ bool aIsMainThread = NS_IsMainThread());
+
+ ~AutoEntryScript();
+
+ void SetWebIDLCallerPrincipal(nsIPrincipal *aPrincipal) {
+ mWebIDLCallerPrincipal = aPrincipal;
+ }
+
+private:
+ // A subclass of AutoEntryMonitor that notifies the docshell.
+ class DocshellEntryMonitor final : public JS::dbg::AutoEntryMonitor
+ {
+ public:
+ DocshellEntryMonitor(JSContext* aCx, const char* aReason);
+
+ // Please note that |aAsyncCause| here is owned by the caller, and its
+ // lifetime must outlive the lifetime of the DocshellEntryMonitor object.
+ // In practice, |aAsyncCause| is identical to |aReason| passed into
+ // the AutoEntryScript constructor, so the lifetime requirements are
+ // trivially satisfied by |aReason| being a statically allocated string.
+ void Entry(JSContext* aCx, JSFunction* aFunction,
+ JS::Handle<JS::Value> aAsyncStack,
+ const char* aAsyncCause) override
+ {
+ Entry(aCx, aFunction, nullptr, aAsyncStack, aAsyncCause);
+ }
+
+ void Entry(JSContext* aCx, JSScript* aScript,
+ JS::Handle<JS::Value> aAsyncStack,
+ const char* aAsyncCause) override
+ {
+ Entry(aCx, nullptr, aScript, aAsyncStack, aAsyncCause);
+ }
+
+ void Exit(JSContext* aCx) override;
+
+ private:
+ void Entry(JSContext* aCx, JSFunction* aFunction, JSScript* aScript,
+ JS::Handle<JS::Value> aAsyncStack,
+ const char* aAsyncCause);
+
+ const char* mReason;
+ };
+
+ // It's safe to make this a weak pointer, since it's the subject principal
+ // when we go on the stack, so can't go away until after we're gone. In
+ // particular, this is only used from the CallSetup constructor, and only in
+ // the aIsJSImplementedWebIDL case. And in that case, the subject principal
+ // is the principal of the callee function that is part of the CallArgs just a
+ // bit up the stack, and which will outlive us. So we know the principal
+ // can't go away until then either.
+ nsIPrincipal* MOZ_NON_OWNING_REF mWebIDLCallerPrincipal;
+ friend nsIPrincipal* GetWebIDLCallerPrincipal();
+
+ Maybe<DocshellEntryMonitor> mDocShellEntryMonitor;
+};
+
+/*
+ * A class that can be used to force a particular incumbent script on the stack.
+ */
+class AutoIncumbentScript : protected ScriptSettingsStackEntry {
+public:
+ explicit AutoIncumbentScript(nsIGlobalObject* aGlobalObject);
+ ~AutoIncumbentScript();
+
+private:
+ JS::AutoHideScriptedCaller mCallerOverride;
+};
+
+/*
+ * A class to put the JS engine in an unusable state. The subject principal
+ * will become System, the information on the script settings stack is
+ * rendered inaccessible, and JSAPI may not be manipulated until the class is
+ * either popped or an AutoJSAPI instance is subsequently pushed.
+ *
+ * This class may not be instantiated if an exception is pending.
+ */
+class AutoNoJSAPI : protected ScriptSettingsStackEntry {
+public:
+ explicit AutoNoJSAPI();
+ ~AutoNoJSAPI();
+};
+
+} // namespace dom
+
+/**
+ * Use AutoJSContext when you need a JS context on the stack but don't have one
+ * passed as a parameter. AutoJSContext will take care of finding the most
+ * appropriate JS context and release it when leaving the stack.
+ */
+class MOZ_RAII AutoJSContext {
+public:
+ explicit AutoJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM);
+ operator JSContext*() const;
+
+protected:
+ JSContext* mCx;
+ dom::AutoJSAPI mJSAPI;
+ MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+/**
+ * AutoSafeJSContext is similar to AutoJSContext but will only return the safe
+ * JS context. That means it will never call nsContentUtils::GetCurrentJSContext().
+ *
+ * Note - This is deprecated. Please use AutoJSAPI instead.
+ */
+class MOZ_RAII AutoSafeJSContext : public dom::AutoJSAPI {
+public:
+ explicit AutoSafeJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM);
+ operator JSContext*() const
+ {
+ return cx();
+ }
+
+private:
+ MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+/**
+ * Use AutoSlowOperation when native side calls many JS callbacks in a row
+ * and slow script dialog should be activated if too much time is spent going
+ * through those callbacks.
+ * AutoSlowOperation puts a JSAutoRequest on the stack so that we don't continue
+ * to reset the watchdog and CheckForInterrupt can be then used to check whether
+ * JS execution should be interrupted.
+ */
+class MOZ_RAII AutoSlowOperation : public dom::AutoJSAPI
+{
+public:
+ explicit AutoSlowOperation(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM);
+ void CheckForInterrupt();
+private:
+ MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+} // namespace mozilla
+
+#endif // mozilla_dom_ScriptSettings_h
diff --git a/dom/script/moz.build b/dom/script/moz.build
new file mode 100644
index 000000000..280850ed4
--- /dev/null
+++ b/dom/script/moz.build
@@ -0,0 +1,36 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# 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/.
+
+XPIDL_SOURCES += [
+ 'nsIScriptLoaderObserver.idl',
+]
+
+XPIDL_MODULE = 'dom'
+
+EXPORTS += ['nsIScriptElement.h']
+
+EXPORTS.mozilla.dom += [
+ 'ScriptElement.h',
+ 'ScriptLoader.h',
+ 'ScriptSettings.h',
+]
+
+SOURCES += [
+ 'ModuleLoadRequest.cpp',
+ 'ModuleScript.cpp',
+ 'ScriptElement.cpp',
+ 'ScriptLoader.cpp',
+ 'ScriptLoadHandler.cpp',
+ 'ScriptSettings.cpp',
+]
+
+LOCAL_INCLUDES += [
+ '/dom/base',
+ '/dom/workers',
+]
+
+include('/ipc/chromium/chromium-config.mozbuild')
+
+FINAL_LIBRARY = 'xul'
diff --git a/dom/script/nsIScriptElement.h b/dom/script/nsIScriptElement.h
new file mode 100644
index 000000000..470d51c94
--- /dev/null
+++ b/dom/script/nsIScriptElement.h
@@ -0,0 +1,329 @@
+/* -*- 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 nsIScriptElement_h___
+#define nsIScriptElement_h___
+
+#include "nsISupports.h"
+#include "nsIURI.h"
+#include "nsCOMPtr.h"
+#include "nsIScriptLoaderObserver.h"
+#include "nsWeakPtr.h"
+#include "nsIParser.h"
+#include "nsContentCreatorFunctions.h"
+#include "nsIDOMHTMLScriptElement.h"
+#include "mozilla/CORSMode.h"
+
+#define NS_ISCRIPTELEMENT_IID \
+{ 0xe60fca9b, 0x1b96, 0x4e4e, \
+ { 0xa9, 0xb4, 0xdc, 0x98, 0x4f, 0x88, 0x3f, 0x9c } }
+
+/**
+ * Internal interface implemented by script elements
+ */
+class nsIScriptElement : public nsIScriptLoaderObserver {
+public:
+ NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTELEMENT_IID)
+
+ explicit nsIScriptElement(mozilla::dom::FromParser aFromParser)
+ : mLineNumber(1),
+ mAlreadyStarted(false),
+ mMalformed(false),
+ mDoneAddingChildren(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
+ aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
+ mForceAsync(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
+ aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
+ mFrozen(false),
+ mDefer(false),
+ mAsync(false),
+ mExternal(false),
+ mParserCreated(aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT ?
+ mozilla::dom::NOT_FROM_PARSER : aFromParser),
+ // Fragment parser-created scripts (if executable)
+ // behave like script-created scripts.
+ mCreatorParser(nullptr)
+ {
+ }
+
+ /**
+ * Content type identifying the scripting language. Can be empty, in
+ * which case javascript will be assumed.
+ * Return false if type attribute is not found.
+ */
+ virtual bool GetScriptType(nsAString& type) = 0;
+
+ /**
+ * Location of script source text. Can return null, in which case
+ * this is assumed to be an inline script element.
+ */
+ nsIURI* GetScriptURI()
+ {
+ NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
+ return mUri;
+ }
+
+ /**
+ * Script source text for inline script elements.
+ */
+ virtual void GetScriptText(nsAString& text) = 0;
+
+ virtual void GetScriptCharset(nsAString& charset) = 0;
+
+ /**
+ * Freezes the return values of GetScriptDeferred(), GetScriptAsync() and
+ * GetScriptURI() so that subsequent modifications to the attributes don't
+ * change execution behavior.
+ */
+ virtual void FreezeUriAsyncDefer() = 0;
+
+ /**
+ * Is the script deferred. Currently only supported by HTML scripts.
+ */
+ bool GetScriptDeferred()
+ {
+ NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
+ return mDefer;
+ }
+
+ /**
+ * Is the script async. Currently only supported by HTML scripts.
+ */
+ bool GetScriptAsync()
+ {
+ NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
+ return mAsync;
+ }
+
+ /**
+ * Is the script an external script?
+ */
+ bool GetScriptExternal()
+ {
+ NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
+ return mExternal;
+ }
+
+ /**
+ * Returns how the element was created.
+ */
+ mozilla::dom::FromParser GetParserCreated()
+ {
+ return mParserCreated;
+ }
+
+ void SetScriptLineNumber(uint32_t aLineNumber)
+ {
+ mLineNumber = aLineNumber;
+ }
+ uint32_t GetScriptLineNumber()
+ {
+ return mLineNumber;
+ }
+
+ void SetIsMalformed()
+ {
+ mMalformed = true;
+ }
+ bool IsMalformed()
+ {
+ return mMalformed;
+ }
+
+ void PreventExecution()
+ {
+ mAlreadyStarted = true;
+ }
+
+ void LoseParserInsertedness()
+ {
+ mFrozen = false;
+ mUri = nullptr;
+ mCreatorParser = nullptr;
+ mParserCreated = mozilla::dom::NOT_FROM_PARSER;
+ bool async = false;
+ nsCOMPtr<nsIDOMHTMLScriptElement> htmlScript = do_QueryInterface(this);
+ if (htmlScript) {
+ htmlScript->GetAsync(&async);
+ }
+ mForceAsync = !async;
+ }
+
+ void SetCreatorParser(nsIParser* aParser)
+ {
+ mCreatorParser = do_GetWeakReference(aParser);
+ }
+
+ /**
+ * Unblocks the creator parser
+ */
+ void UnblockParser()
+ {
+ nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
+ if (parser) {
+ parser->UnblockParser();
+ }
+ }
+
+ /**
+ * Attempts to resume parsing asynchronously
+ */
+ void ContinueParserAsync()
+ {
+ nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
+ if (parser) {
+ parser->ContinueInterruptedParsingAsync();
+ }
+ }
+
+ /**
+ * Informs the creator parser that the evaluation of this script is starting
+ */
+ void BeginEvaluating()
+ {
+ nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
+ if (parser) {
+ parser->PushDefinedInsertionPoint();
+ }
+ }
+
+ /**
+ * Informs the creator parser that the evaluation of this script is ending
+ */
+ void EndEvaluating()
+ {
+ nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
+ if (parser) {
+ parser->PopDefinedInsertionPoint();
+ }
+ }
+
+ /**
+ * Retrieves a pointer to the creator parser if this has one or null if not
+ */
+ already_AddRefed<nsIParser> GetCreatorParser()
+ {
+ nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
+ return parser.forget();
+ }
+
+ /**
+ * This method is called when the parser finishes creating the script
+ * element's children, if any are present.
+ *
+ * @return whether the parser will be blocked while this script is being
+ * loaded
+ */
+ bool AttemptToExecute()
+ {
+ mDoneAddingChildren = true;
+ bool block = MaybeProcessScript();
+ if (!mAlreadyStarted) {
+ // Need to lose parser-insertedness here to allow another script to cause
+ // execution later.
+ LoseParserInsertedness();
+ }
+ return block;
+ }
+
+ /**
+ * Get the CORS mode of the script element
+ */
+ virtual mozilla::CORSMode GetCORSMode() const
+ {
+ /* Default to no CORS */
+ return mozilla::CORS_NONE;
+ }
+
+ /**
+ * Fire an error event
+ */
+ virtual nsresult FireErrorEvent() = 0;
+
+protected:
+ /**
+ * Processes the script if it's in the document-tree and links to or
+ * contains a script. Once it has been evaluated there is no way to make it
+ * reevaluate the script, you'll have to create a new element. This also means
+ * that when adding a src attribute to an element that already contains an
+ * inline script, the script referenced by the src attribute will not be
+ * loaded.
+ *
+ * In order to be able to use multiple childNodes, or to use the
+ * fallback mechanism of using both inline script and linked script you have
+ * to add all attributes and childNodes before adding the element to the
+ * document-tree.
+ *
+ * @return whether the parser will be blocked while this script is being
+ * loaded
+ */
+ virtual bool MaybeProcessScript() = 0;
+
+ /**
+ * The start line number of the script.
+ */
+ uint32_t mLineNumber;
+
+ /**
+ * The "already started" flag per HTML5.
+ */
+ bool mAlreadyStarted;
+
+ /**
+ * The script didn't have an end tag.
+ */
+ bool mMalformed;
+
+ /**
+ * False if parser-inserted but the parser hasn't triggered running yet.
+ */
+ bool mDoneAddingChildren;
+
+ /**
+ * If true, the .async property returns true instead of reflecting the
+ * content attribute.
+ */
+ bool mForceAsync;
+
+ /**
+ * Whether src, defer and async are frozen.
+ */
+ bool mFrozen;
+
+ /**
+ * The effective deferredness.
+ */
+ bool mDefer;
+
+ /**
+ * The effective asyncness.
+ */
+ bool mAsync;
+
+ /**
+ * The effective externalness. A script can be external with mUri being null
+ * if the src attribute contained an invalid URL string.
+ */
+ bool mExternal;
+
+ /**
+ * Whether this element was parser-created.
+ */
+ mozilla::dom::FromParser mParserCreated;
+
+ /**
+ * The effective src (or null if no src).
+ */
+ nsCOMPtr<nsIURI> mUri;
+
+ /**
+ * The creator parser of a non-defer, non-async parser-inserted script.
+ */
+ nsWeakPtr mCreatorParser;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptElement, NS_ISCRIPTELEMENT_IID)
+
+#endif // nsIScriptElement_h___
diff --git a/dom/script/nsIScriptLoaderObserver.idl b/dom/script/nsIScriptLoaderObserver.idl
new file mode 100644
index 000000000..ed7196525
--- /dev/null
+++ b/dom/script/nsIScriptLoaderObserver.idl
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+interface nsIScriptElement;
+interface nsIURI;
+
+[scriptable, uuid(7b787204-76fb-4764-96f1-fb7a666db4f4)]
+interface nsIScriptLoaderObserver : nsISupports {
+
+ /**
+ * The script is available for evaluation. For inline scripts, this
+ * method will be called synchronously. For externally loaded scripts,
+ * this method will be called when the load completes.
+ *
+ * @param aResult A result code representing the result of loading
+ * a script. If this is a failure code, script evaluation
+ * will not occur.
+ * @param aElement The element being processed.
+ * @param aIsInline Is this an inline script or externally loaded?
+ * @param aURI What is the URI of the script (the document URI if
+ * it is inline).
+ * @param aLineNo At what line does the script appear (generally 1
+ * if it is a loaded script).
+ */
+ void scriptAvailable(in nsresult aResult,
+ in nsIScriptElement aElement,
+ in boolean aIsInline,
+ in nsIURI aURI,
+ in int32_t aLineNo);
+
+ /**
+ * The script has been evaluated.
+ *
+ * @param aResult A result code representing the success or failure of
+ * the script evaluation.
+ * @param aElement The element being processed.
+ * @param aIsInline Is this an inline script or externally loaded?
+ */
+ void scriptEvaluated(in nsresult aResult,
+ in nsIScriptElement aElement,
+ in boolean aIsInline);
+
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 13:20:55 +0000