The Tor Browser: parser/html/nsHtml5TreeOpExecutor.cpp@925c144e1f1f (annotated)

parser/html/nsHtml5TreeOpExecutor.cpp@925c144e1f1f (annotated)

parser/html/nsHtml5TreeOpExecutor.cpp

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=2 et tw=79: */
 /* 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/DebugOnly.h"
 #include "mozilla/Likely.h"
 #include "nsError.h"
 #include "nsHtml5TreeOpExecutor.h"
 #include "nsScriptLoader.h"
 #include "nsIMarkupDocumentViewer.h"
 #include "nsIContentViewer.h"
 #include "nsIDocShellTreeItem.h"
 #include "nsIDocShell.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsIWebShellServices.h"
 #include "nsContentUtils.h"
 #include "mozAutoDocUpdate.h"
 #include "nsNetUtil.h"
 #include "nsHtml5Parser.h"
 #include "nsHtml5Tokenizer.h"
 #include "nsHtml5TreeBuilder.h"
 #include "nsHtml5StreamParser.h"
 #include "mozilla/css/Loader.h"
 #include "GeckoProfiler.h"
 #include "nsIScriptError.h"
 #include "nsIScriptContext.h"
 #include "mozilla/Preferences.h"
 #include "nsIHTMLDocument.h"
 using namespace mozilla;
 NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(nsHtml5TreeOpExecutor)
   NS_INTERFACE_TABLE_INHERITED(nsHtml5TreeOpExecutor,
                                nsIContentSink)
 NS_INTERFACE_TABLE_TAIL_INHERITING(nsHtml5DocumentBuilder)
 NS_IMPL_ADDREF_INHERITED(nsHtml5TreeOpExecutor, nsContentSink)
 NS_IMPL_RELEASE_INHERITED(nsHtml5TreeOpExecutor, nsContentSink)
 class nsHtml5ExecutorReflusher : public nsRunnable
 {
   private:
     nsRefPtr<nsHtml5TreeOpExecutor> mExecutor;
   public:
     nsHtml5ExecutorReflusher(nsHtml5TreeOpExecutor* aExecutor)
       : mExecutor(aExecutor)
     {}
     NS_IMETHODIMP Run()
     {
       mExecutor->RunFlushLoop();
       return NS_OK;
     }
 };
 static mozilla::LinkedList<nsHtml5TreeOpExecutor>* gBackgroundFlushList = nullptr;
 static nsITimer* gFlushTimer = nullptr;
 nsHtml5TreeOpExecutor::nsHtml5TreeOpExecutor()
   : nsHtml5DocumentBuilder(false)
   , mPreloadedURLs(23)  // Mean # of preloadable resources per page on dmoz
 {
   // zeroing operator new for everything else
 }
 nsHtml5TreeOpExecutor::~nsHtml5TreeOpExecutor()
 {
   if (gBackgroundFlushList && isInList()) {
     mOpQueue.Clear();
     removeFrom(*gBackgroundFlushList);
     if (gBackgroundFlushList->isEmpty()) {
       delete gBackgroundFlushList;
       gBackgroundFlushList = nullptr;
       if (gFlushTimer) {
         gFlushTimer->Cancel();
         NS_RELEASE(gFlushTimer);
       }
     }
   }
   NS_ASSERTION(mOpQueue.IsEmpty(), "Somehow there's stuff in the op queue.");
 }
 // nsIContentSink
 NS_IMETHODIMP
 nsHtml5TreeOpExecutor::WillParse()
 {
   NS_NOTREACHED("No one should call this");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsHtml5TreeOpExecutor::WillBuildModel(nsDTDMode aDTDMode)
 {
   mDocument->AddObserver(this);
   WillBuildModelImpl();
   GetDocument()->BeginLoad();
   if (mDocShell && !GetDocument()->GetWindow() &&
       !IsExternalViewSource()) {
     // Not loading as data but script global object not ready
     return MarkAsBroken(NS_ERROR_DOM_INVALID_STATE_ERR);
   }
   return NS_OK;
 }
 // This is called when the tree construction has ended
 NS_IMETHODIMP
 nsHtml5TreeOpExecutor::DidBuildModel(bool aTerminated)
 {
   if (!aTerminated) {
     // This is needed to avoid unblocking loads too many times on one hand
     // and on the other hand to avoid destroying the frame constructor from
     // within an update batch. See bug 537683.
     EndDocUpdate();
     // If the above caused a call to nsIParser::Terminate(), let that call
     // win.
     if (!mParser) {
       return NS_OK;
     }
   }
   if (mRunsToCompletion) {
     return NS_OK;
   }
   GetParser()->DropStreamParser();
   // This comes from nsXMLContentSink and nsHTMLContentSink
   // If this parser has been marked as broken, treat the end of parse as
   // forced termination.
   DidBuildModelImpl(aTerminated || NS_FAILED(IsBroken()));
   if (!mLayoutStarted) {
     // We never saw the body, and layout never got started. Force
     // layout *now*, to get an initial reflow.
     // NOTE: only force the layout if we are NOT destroying the
     // docshell. If we are destroying it, then starting layout will
     // likely cause us to crash, or at best waste a lot of time as we
     // are just going to tear it down anyway.
     bool destroying = true;
     if (mDocShell) {
       mDocShell->IsBeingDestroyed(&destroying);
     }
     if (!destroying) {
       nsContentSink::StartLayout(false);
     }
   }
   ScrollToRef();
   mDocument->RemoveObserver(this);
   if (!mParser) {
     // DidBuildModelImpl may cause mParser to be nulled out
     // Return early to avoid unblocking the onload event too many times.
     return NS_OK;
   }
   // We may not have called BeginLoad() if loading is terminated before
   // OnStartRequest call.
   if (mStarted) {
     mDocument->EndLoad();
   }
   DropParserAndPerfHint();
 #ifdef GATHER_DOCWRITE_STATISTICS
   printf("UNSAFE SCRIPTS: %d\n", sUnsafeDocWrites);
   printf("TOKENIZER-SAFE SCRIPTS: %d\n", sTokenSafeDocWrites);
   printf("TREEBUILDER-SAFE SCRIPTS: %d\n", sTreeSafeDocWrites);
 #endif
 #ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
   printf("MAX NOTIFICATION BATCH LEN: %d\n", sAppendBatchMaxSize);
   if (sAppendBatchExaminations != 0) {
     printf("AVERAGE SLOTS EXAMINED: %d\n", sAppendBatchSlotsExamined / sAppendBatchExaminations);
   }
 #endif
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHtml5TreeOpExecutor::WillInterrupt()
 {
   NS_NOTREACHED("Don't call. For interface compat only.");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsHtml5TreeOpExecutor::WillResume()
 {
   NS_NOTREACHED("Don't call. For interface compat only.");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsHtml5TreeOpExecutor::SetParser(nsParserBase* aParser)
 {
   mParser = aParser;
   return NS_OK;
 }
 void
 nsHtml5TreeOpExecutor::FlushPendingNotifications(mozFlushType aType)
 {
   if (aType >= Flush_InterruptibleLayout) {
     // Bug 577508 / 253951
     nsContentSink::StartLayout(true);
   }
 }
 nsISupports*
 nsHtml5TreeOpExecutor::GetTarget()
 {
   return mDocument;
 }
 nsresult
 nsHtml5TreeOpExecutor::MarkAsBroken(nsresult aReason)
 {
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   mBroken = aReason;
   if (mStreamParser) {
     mStreamParser->Terminate();
   }
   // We are under memory pressure, but let's hope the following allocation
   // works out so that we get to terminate and clean up the parser from
   // a safer point.
   if (mParser) { // can mParser ever be null here?
     nsCOMPtr<nsIRunnable> terminator =
       NS_NewRunnableMethod(GetParser(), &nsHtml5Parser::Terminate);
     if (NS_FAILED(NS_DispatchToMainThread(terminator))) {
       NS_WARNING("failed to dispatch executor flush event");
     }
   }
   return aReason;
 }
 void
 FlushTimerCallback(nsITimer* aTimer, void* aClosure)
 {
   nsRefPtr<nsHtml5TreeOpExecutor> ex = gBackgroundFlushList->popFirst();
   if (ex) {
     ex->RunFlushLoop();
   }
   if (gBackgroundFlushList && gBackgroundFlushList->isEmpty()) {
     delete gBackgroundFlushList;
     gBackgroundFlushList = nullptr;
     gFlushTimer->Cancel();
     NS_RELEASE(gFlushTimer);
   }
 }
 void
 nsHtml5TreeOpExecutor::ContinueInterruptedParsingAsync()
 {
   if (!mDocument || !mDocument->IsInBackgroundWindow()) {
     nsCOMPtr<nsIRunnable> flusher = new nsHtml5ExecutorReflusher(this);
     if (NS_FAILED(NS_DispatchToMainThread(flusher))) {
       NS_WARNING("failed to dispatch executor flush event");
     }
   } else {
     if (!gBackgroundFlushList) {
       gBackgroundFlushList = new mozilla::LinkedList<nsHtml5TreeOpExecutor>();
     }
     if (!isInList()) {
       gBackgroundFlushList->insertBack(this);
     }
     if (!gFlushTimer) {
       nsCOMPtr<nsITimer> t = do_CreateInstance("@mozilla.org/timer;1");
       t.swap(gFlushTimer);
       // The timer value 50 should not hopefully slow down background pages too
       // much, yet lets event loop to process enough between ticks.
       // See bug 734015.
       gFlushTimer->InitWithFuncCallback(FlushTimerCallback, nullptr,
 , nsITimer::TYPE_REPEATING_SLACK);
     }
   }
 }
 void
 nsHtml5TreeOpExecutor::FlushSpeculativeLoads()
 {
   nsTArray<nsHtml5SpeculativeLoad> speculativeLoadQueue;
   mStage.MoveSpeculativeLoadsTo(speculativeLoadQueue);
   const nsHtml5SpeculativeLoad* start = speculativeLoadQueue.Elements();
   const nsHtml5SpeculativeLoad* end = start + speculativeLoadQueue.Length();
   for (nsHtml5SpeculativeLoad* iter = const_cast<nsHtml5SpeculativeLoad*>(start);
        iter < end;
        ++iter) {
     if (MOZ_UNLIKELY(!mParser)) {
       // An extension terminated the parser from a HTTP observer.
       return;
     }
     iter->Perform(this);
   }
 }
 class nsHtml5FlushLoopGuard
 {
   private:
     nsRefPtr<nsHtml5TreeOpExecutor> mExecutor;
     #ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
     uint32_t mStartTime;
     #endif
   public:
     nsHtml5FlushLoopGuard(nsHtml5TreeOpExecutor* aExecutor)
       : mExecutor(aExecutor)
     #ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
       , mStartTime(PR_IntervalToMilliseconds(PR_IntervalNow()))
     #endif
     {
       mExecutor->mRunFlushLoopOnStack = true;
     }
     ~nsHtml5FlushLoopGuard()
     {
       #ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
         uint32_t timeOffTheEventLoop =
           PR_IntervalToMilliseconds(PR_IntervalNow()) - mStartTime;
         if (timeOffTheEventLoop >
             nsHtml5TreeOpExecutor::sLongestTimeOffTheEventLoop) {
           nsHtml5TreeOpExecutor::sLongestTimeOffTheEventLoop =
             timeOffTheEventLoop;
         }
         printf("Longest time off the event loop: %d\n",
           nsHtml5TreeOpExecutor::sLongestTimeOffTheEventLoop);
       #endif
       mExecutor->mRunFlushLoopOnStack = false;
     }
 };
 /**
  * The purpose of the loop here is to avoid returning to the main event loop
  */
 void
 nsHtml5TreeOpExecutor::RunFlushLoop()
 {
   PROFILER_LABEL("html5", "RunFlushLoop");
   if (mRunFlushLoopOnStack) {
     // There's already a RunFlushLoop() on the call stack.
     return;
   }
   nsHtml5FlushLoopGuard guard(this); // this is also the self-kungfu!
   nsCOMPtr<nsISupports> parserKungFuDeathGrip(mParser);
   // Remember the entry time
   (void) nsContentSink::WillParseImpl();
   for (;;) {
     if (!mParser) {
       // Parse has terminated.
       mOpQueue.Clear(); // clear in order to be able to assert in destructor
       return;
     }
     if (NS_FAILED(IsBroken())) {
       return;
     }
     if (!mParser->IsParserEnabled()) {
       // The parser is blocked.
       return;
     }
     if (mFlushState != eNotFlushing) {
       // XXX Can this happen? In case it can, let's avoid crashing.
       return;
     }
     // If there are scripts executing, then the content sink is jumping the gun
     // (probably due to a synchronous XMLHttpRequest) and will re-enable us
     // later, see bug 460706.
     if (IsScriptExecuting()) {
       return;
     }
     if (mReadingFromStage) {
       nsTArray<nsHtml5SpeculativeLoad> speculativeLoadQueue;
       mStage.MoveOpsAndSpeculativeLoadsTo(mOpQueue, speculativeLoadQueue);
       // Make sure speculative loads never start after the corresponding
       // normal loads for the same URLs.
       const nsHtml5SpeculativeLoad* start = speculativeLoadQueue.Elements();
       const nsHtml5SpeculativeLoad* end = start + speculativeLoadQueue.Length();
       for (nsHtml5SpeculativeLoad* iter = (nsHtml5SpeculativeLoad*)start;
            iter < end;
            ++iter) {
         iter->Perform(this);
         if (MOZ_UNLIKELY(!mParser)) {
           // An extension terminated the parser from a HTTP observer.
           mOpQueue.Clear(); // clear in order to be able to assert in destructor
           return;
         }
       }
     } else {
       FlushSpeculativeLoads(); // Make sure speculative loads never start after
                                // the corresponding normal loads for the same
                                // URLs.
       if (MOZ_UNLIKELY(!mParser)) {
         // An extension terminated the parser from a HTTP observer.
         mOpQueue.Clear(); // clear in order to be able to assert in destructor
         return;
       }
       // Not sure if this grip is still needed, but previously, the code
       // gripped before calling ParseUntilBlocked();
       nsRefPtr<nsHtml5StreamParser> streamKungFuDeathGrip =
         GetParser()->GetStreamParser();
       // Now parse content left in the document.write() buffer queue if any.
       // This may generate tree ops on its own or dequeue a speculation.
       nsresult rv = GetParser()->ParseUntilBlocked();
       if (NS_FAILED(rv)) {
         MarkAsBroken(rv);
         return;
       }
     }
     if (mOpQueue.IsEmpty()) {
       // Avoid bothering the rest of the engine with a doc update if there's
       // nothing to do.
       return;
     }
     mFlushState = eInFlush;
     nsIContent* scriptElement = nullptr;
     BeginDocUpdate();
     uint32_t numberOfOpsToFlush = mOpQueue.Length();
     SetAppendBatchCapacity(numberOfOpsToFlush * 2);
     const nsHtml5TreeOperation* first = mOpQueue.Elements();
     const nsHtml5TreeOperation* last = first + numberOfOpsToFlush - 1;
     for (nsHtml5TreeOperation* iter = const_cast<nsHtml5TreeOperation*>(first);;) {
       if (MOZ_UNLIKELY(!mParser)) {
         // The previous tree op caused a call to nsIParser::Terminate().
         break;
       }
       NS_ASSERTION(mFlushState == eInDocUpdate,
         "Tried to perform tree op outside update batch.");
       nsresult rv = iter->Perform(this, &scriptElement);
       if (NS_FAILED(rv)) {
         MarkAsBroken(rv);
         break;
       }
       // Be sure not to check the deadline if the last op was just performed.
       if (MOZ_UNLIKELY(iter == last)) {
         break;
       } else if (MOZ_UNLIKELY(nsContentSink::DidProcessATokenImpl() ==
                  NS_ERROR_HTMLPARSER_INTERRUPTED)) {
         mOpQueue.RemoveElementsAt(0, (iter - first) + 1);
         EndDocUpdate();
         mFlushState = eNotFlushing;
         #ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
           printf("REFLUSH SCHEDULED (executing ops): %d\n",
             ++sTimesFlushLoopInterrupted);
         #endif
         nsHtml5TreeOpExecutor::ContinueInterruptedParsingAsync();
         return;
       }
       ++iter;
     }
     mOpQueue.Clear();
     EndDocUpdate();
     mFlushState = eNotFlushing;
     if (MOZ_UNLIKELY(!mParser)) {
       // The parse ended already.
       return;
     }
     if (scriptElement) {
       // must be tail call when mFlushState is eNotFlushing
       RunScript(scriptElement);
       // Always check the clock in nsContentSink right after a script
       StopDeflecting();
       if (nsContentSink::DidProcessATokenImpl() ==
           NS_ERROR_HTMLPARSER_INTERRUPTED) {
         #ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
           printf("REFLUSH SCHEDULED (after script): %d\n",
             ++sTimesFlushLoopInterrupted);
         #endif
         nsHtml5TreeOpExecutor::ContinueInterruptedParsingAsync();
         return;
       }
     }
   }
 }
 nsresult
 nsHtml5TreeOpExecutor::FlushDocumentWrite()
 {
   nsresult rv = IsBroken();
   NS_ENSURE_SUCCESS(rv, rv);
   FlushSpeculativeLoads(); // Make sure speculative loads never start after the
                 // corresponding normal loads for the same URLs.
   if (MOZ_UNLIKELY(!mParser)) {
     // The parse has ended.
     mOpQueue.Clear(); // clear in order to be able to assert in destructor
     return rv;
   }
   if (mFlushState != eNotFlushing) {
     // XXX Can this happen? In case it can, let's avoid crashing.
     return rv;
   }
   mFlushState = eInFlush;
   // avoid crashing near EOF
   nsRefPtr<nsHtml5TreeOpExecutor> kungFuDeathGrip(this);
   nsRefPtr<nsParserBase> parserKungFuDeathGrip(mParser);
   NS_ASSERTION(!mReadingFromStage,
     "Got doc write flush when reading from stage");
 #ifdef DEBUG
   mStage.AssertEmpty();
 #endif
   nsIContent* scriptElement = nullptr;
   BeginDocUpdate();
   uint32_t numberOfOpsToFlush = mOpQueue.Length();
   SetAppendBatchCapacity(numberOfOpsToFlush * 2);
   const nsHtml5TreeOperation* start = mOpQueue.Elements();
   const nsHtml5TreeOperation* end = start + numberOfOpsToFlush;
   for (nsHtml5TreeOperation* iter = const_cast<nsHtml5TreeOperation*>(start);
        iter < end;
        ++iter) {
     if (MOZ_UNLIKELY(!mParser)) {
       // The previous tree op caused a call to nsIParser::Terminate().
       break;
     }
     NS_ASSERTION(mFlushState == eInDocUpdate,
       "Tried to perform tree op outside update batch.");
     rv = iter->Perform(this, &scriptElement);
     if (NS_FAILED(rv)) {
       MarkAsBroken(rv);
       break;
     }
   }
   mOpQueue.Clear();
   EndDocUpdate();
   mFlushState = eNotFlushing;
   if (MOZ_UNLIKELY(!mParser)) {
     // Ending the doc update caused a call to nsIParser::Terminate().
     return rv;
   }
   if (scriptElement) {
     // must be tail call when mFlushState is eNotFlushing
     RunScript(scriptElement);
   }
   return rv;
 }
 // copied from HTML content sink
 bool
 nsHtml5TreeOpExecutor::IsScriptEnabled()
 {
   if (!mDocument || !mDocShell)
     return true;
   nsCOMPtr<nsIScriptGlobalObject> globalObject = do_QueryInterface(mDocument->GetInnerWindow());
   // Getting context is tricky if the document hasn't had its
   // GlobalObject set yet
   if (!globalObject) {
     globalObject = mDocShell->GetScriptGlobalObject();
     NS_ENSURE_TRUE(globalObject, true);
   }
   NS_ENSURE_TRUE(globalObject && globalObject->GetGlobalJSObject(), true);
   return nsContentUtils::GetSecurityManager()->
            ScriptAllowed(globalObject->GetGlobalJSObject());
 }
 void
 nsHtml5TreeOpExecutor::StartLayout() {
   if (mLayoutStarted || !mDocument) {
     return;
   }
   EndDocUpdate();
   if (MOZ_UNLIKELY(!mParser)) {
     // got terminate
     return;
   }
   nsContentSink::StartLayout(false);
   BeginDocUpdate();
 }
 /**
  * The reason why this code is here and not in the tree builder even in the
  * main-thread case is to allow the control to return from the tokenizer
  * before scripts run. This way, the tokenizer is not invoked re-entrantly
  * although the parser is.
  *
  * The reason why this is called as a tail call when mFlushState is set to
  * eNotFlushing is to allow re-entry to Flush() but only after the current
  * Flush() has cleared the op queue and is otherwise done cleaning up after
  * itself.
  */
 void
 nsHtml5TreeOpExecutor::RunScript(nsIContent* aScriptElement)
 {
   if (mRunsToCompletion) {
     // We are in createContextualFragment() or in the upcoming document.parse().
     // Do nothing. Let's not even mark scripts malformed here, because that
     // could cause serialization weirdness later.
     return;
   }
   NS_ASSERTION(aScriptElement, "No script to run");
   nsCOMPtr<nsIScriptElement> sele = do_QueryInterface(aScriptElement);
   if (!mParser) {
     NS_ASSERTION(sele->IsMalformed(), "Script wasn't marked as malformed.");
     // We got here not because of an end tag but because the tree builder
     // popped an incomplete script element on EOF. Returning here to avoid
     // calling back into mParser anymore.
     return;
   }
   if (sele->GetScriptDeferred() || sele->GetScriptAsync()) {
     DebugOnly<bool> block = sele->AttemptToExecute();
     NS_ASSERTION(!block, "Defer or async script tried to block.");
     return;
   }
   NS_ASSERTION(mFlushState == eNotFlushing, "Tried to run script when flushing.");
   mReadingFromStage = false;
   sele->SetCreatorParser(GetParser());
   // Copied from nsXMLContentSink
   // Now tell the script that it's ready to go. This may execute the script
   // or return true, or neither if the script doesn't need executing.
   bool block = sele->AttemptToExecute();
   // If the act of insertion evaluated the script, we're fine.
   // Else, block the parser till the script has loaded.
   if (block) {
     if (mParser) {
       GetParser()->BlockParser();
     }
   } else {
     // mParser may have been nulled out by now, but the flusher deals
     // If this event isn't needed, it doesn't do anything. It is sometimes
     // necessary for the parse to continue after complex situations.
     nsHtml5TreeOpExecutor::ContinueInterruptedParsingAsync();
   }
 }
 void
 nsHtml5TreeOpExecutor::Start()
 {
   NS_PRECONDITION(!mStarted, "Tried to start when already started.");
   mStarted = true;
 }
 void
 nsHtml5TreeOpExecutor::NeedsCharsetSwitchTo(const char* aEncoding,
                                             int32_t aSource,
                                             uint32_t aLineNumber)
 {
   EndDocUpdate();
   if (MOZ_UNLIKELY(!mParser)) {
     // got terminate
     return;
   }
   nsCOMPtr<nsIWebShellServices> wss = do_QueryInterface(mDocShell);
   if (!wss) {
     return;
   }
   // ask the webshellservice to load the URL
   if (NS_SUCCEEDED(wss->StopDocumentLoad())) {
     wss->ReloadDocument(aEncoding, aSource);
   }
   // if the charset switch was accepted, wss has called Terminate() on the
   // parser by now
   if (!mParser) {
     // success
     if (aSource == kCharsetFromMetaTag) {
       MaybeComplainAboutCharset("EncLateMetaReload", false, aLineNumber);
     }
     return;
   }
   if (aSource == kCharsetFromMetaTag) {
     MaybeComplainAboutCharset("EncLateMetaTooLate", true, aLineNumber);
   }
   GetParser()->ContinueAfterFailedCharsetSwitch();
   BeginDocUpdate();
 }
 void
 nsHtml5TreeOpExecutor::MaybeComplainAboutCharset(const char* aMsgId,
                                                  bool aError,
                                                  uint32_t aLineNumber)
 {
   if (mAlreadyComplainedAboutCharset) {
     return;
   }
   // The EncNoDeclaration case for advertising iframes is so common that it
   // would result is way too many errors. The iframe case doesn't matter
   // when the ad is an image or a Flash animation anyway. When the ad is
   // textual, a misrendered ad probably isn't a huge loss for users.
   // Let's suppress the message in this case.
   // This means that errors about other different-origin iframes in mashups
   // are lost as well, but generally, the site author isn't in control of
   // the embedded different-origin pages anyway and can't fix problems even
   // if alerted about them.
   if (!strcmp(aMsgId, "EncNoDeclaration") && mDocShell) {
     nsCOMPtr<nsIDocShellTreeItem> parent;
     mDocShell->GetSameTypeParent(getter_AddRefs(parent));
     if (parent) {
       return;
     }
   }
   mAlreadyComplainedAboutCharset = true;
   nsContentUtils::ReportToConsole(aError ? nsIScriptError::errorFlag
                                          : nsIScriptError::warningFlag,
                                   NS_LITERAL_CSTRING("HTML parser"),
                                   mDocument,
                                   nsContentUtils::eHTMLPARSER_PROPERTIES,
                                   aMsgId,
                                   nullptr,
 ,
                                   nullptr,
                                   EmptyString(),
                                   aLineNumber);
 }
 void
 nsHtml5TreeOpExecutor::ComplainAboutBogusProtocolCharset(nsIDocument* aDoc)
 {
   NS_ASSERTION(!mAlreadyComplainedAboutCharset,
                "How come we already managed to complain?");
   mAlreadyComplainedAboutCharset = true;
   nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
                                   NS_LITERAL_CSTRING("HTML parser"),
                                   aDoc,
                                   nsContentUtils::eHTMLPARSER_PROPERTIES,
                                   "EncProtocolUnsupported");
 }
 nsHtml5Parser*
 nsHtml5TreeOpExecutor::GetParser()
 {
   MOZ_ASSERT(!mRunsToCompletion);
   return static_cast<nsHtml5Parser*>(mParser.get());
 }
 void
 nsHtml5TreeOpExecutor::MoveOpsFrom(nsTArray<nsHtml5TreeOperation>& aOpQueue)
 {
   NS_PRECONDITION(mFlushState == eNotFlushing, "mOpQueue modified during tree op execution.");
   if (mOpQueue.IsEmpty()) {
     mOpQueue.SwapElements(aOpQueue);
     return;
   }
   mOpQueue.MoveElementsFrom(aOpQueue);
 }
 void
 nsHtml5TreeOpExecutor::InitializeDocWriteParserState(nsAHtml5TreeBuilderState* aState, int32_t aLine)
 {
   GetParser()->InitializeDocWriteParserState(aState, aLine);
 }
 nsIURI*
 nsHtml5TreeOpExecutor::GetViewSourceBaseURI()
 {
   if (!mViewSourceBaseURI) {
     // We query the channel for the baseURI because in certain situations it
     // cannot otherwise be determined. If this process fails, fall back to the
     // standard method.
     nsCOMPtr<nsIViewSourceChannel> vsc;
     vsc = do_QueryInterface(mDocument->GetChannel());
     if (vsc) {
       nsresult rv =  vsc->GetBaseURI(getter_AddRefs(mViewSourceBaseURI));
       if (NS_SUCCEEDED(rv) && mViewSourceBaseURI) {
         return mViewSourceBaseURI;
       }
     }
     nsCOMPtr<nsIURI> orig = mDocument->GetOriginalURI();
     bool isViewSource;
     orig->SchemeIs("view-source", &isViewSource);
     if (isViewSource) {
       nsCOMPtr<nsINestedURI> nested = do_QueryInterface(orig);
       NS_ASSERTION(nested, "URI with scheme view-source didn't QI to nested!");
       nested->GetInnerURI(getter_AddRefs(mViewSourceBaseURI));
     } else {
       // Fail gracefully if the base URL isn't a view-source: URL.
       // Not sure if this can ever happen.
       mViewSourceBaseURI = orig;
     }
   }
   return mViewSourceBaseURI;
 }
 //static
 void
 nsHtml5TreeOpExecutor::InitializeStatics()
 {
   mozilla::Preferences::AddBoolVarCache(&sExternalViewSource,
                                         "view_source.editor.external");
 }
 bool
 nsHtml5TreeOpExecutor::IsExternalViewSource()
 {
   if (!sExternalViewSource) {
     return false;
   }
   bool isViewSource = false;
   if (mDocumentURI) {
     mDocumentURI->SchemeIs("view-source", &isViewSource);
   }
   return isViewSource;
 }
 // Speculative loading
 already_AddRefed<nsIURI>
 nsHtml5TreeOpExecutor::ConvertIfNotPreloadedYet(const nsAString& aURL)
 {
   if (aURL.IsEmpty()) {
     return nullptr;
   }
   // The URL of the document without <base>
   nsIURI* documentURI = mDocument->GetDocumentURI();
   // The URL of the document with non-speculative <base>
   nsIURI* documentBaseURI = mDocument->GetDocBaseURI();
   // If the two above are different, use documentBaseURI. If they are the
   // same, the document object isn't aware of a <base>, so attempt to use the
   // mSpeculationBaseURI or, failing, that, documentURI.
   nsIURI* base = (documentURI == documentBaseURI) ?
                   (mSpeculationBaseURI ?
                    mSpeculationBaseURI.get() : documentURI)
                  : documentBaseURI;
   const nsCString& charset = mDocument->GetDocumentCharacterSet();
   nsCOMPtr<nsIURI> uri;
   nsresult rv = NS_NewURI(getter_AddRefs(uri), aURL, charset.get(), base);
   if (NS_FAILED(rv)) {
     NS_WARNING("Failed to create a URI");
     return nullptr;
   }
   nsAutoCString spec;
   uri->GetSpec(spec);
   if (mPreloadedURLs.Contains(spec)) {
     return nullptr;
   }
   mPreloadedURLs.PutEntry(spec);
   return uri.forget();
 }
 void
 nsHtml5TreeOpExecutor::PreloadScript(const nsAString& aURL,
                                      const nsAString& aCharset,
                                      const nsAString& aType,
                                      const nsAString& aCrossOrigin,
                                      bool aScriptFromHead)
 {
   nsCOMPtr<nsIURI> uri = ConvertIfNotPreloadedYet(aURL);
   if (!uri) {
     return;
   }
   mDocument->ScriptLoader()->PreloadURI(uri, aCharset, aType, aCrossOrigin,
                                         aScriptFromHead);
 }
 void
 nsHtml5TreeOpExecutor::PreloadStyle(const nsAString& aURL,
                                     const nsAString& aCharset,
                                     const nsAString& aCrossOrigin)
 {
   nsCOMPtr<nsIURI> uri = ConvertIfNotPreloadedYet(aURL);
   if (!uri) {
     return;
   }
   mDocument->PreloadStyle(uri, aCharset, aCrossOrigin);
 }
 void
 nsHtml5TreeOpExecutor::PreloadImage(const nsAString& aURL,
                                     const nsAString& aCrossOrigin)
 {
   nsCOMPtr<nsIURI> uri = ConvertIfNotPreloadedYet(aURL);
   if (!uri) {
     return;
   }
   mDocument->MaybePreLoadImage(uri, aCrossOrigin);
 }
 void
 nsHtml5TreeOpExecutor::SetSpeculationBase(const nsAString& aURL)
 {
   if (mSpeculationBaseURI) {
     // the first one wins
     return;
   }
   const nsCString& charset = mDocument->GetDocumentCharacterSet();
   DebugOnly<nsresult> rv = NS_NewURI(getter_AddRefs(mSpeculationBaseURI), aURL,
                                      charset.get(), mDocument->GetDocumentURI());
   NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "Failed to create a URI");
 }
 #ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
 uint32_t nsHtml5TreeOpExecutor::sAppendBatchMaxSize = 0;
 uint32_t nsHtml5TreeOpExecutor::sAppendBatchSlotsExamined = 0;
 uint32_t nsHtml5TreeOpExecutor::sAppendBatchExaminations = 0;
 uint32_t nsHtml5TreeOpExecutor::sLongestTimeOffTheEventLoop = 0;
 uint32_t nsHtml5TreeOpExecutor::sTimesFlushLoopInterrupted = 0;
 #endif
 bool nsHtml5TreeOpExecutor::sExternalViewSource = false;

The Tor Browser / annotate

parser/html/nsHtml5TreeOpExecutor.cpp@925c144e1f1f (annotated)

parser/html/nsHtml5TreeOpExecutor.cpp