зеркало из https://github.com/mozilla/pjs.git
1167 строки
42 KiB
C++
1167 строки
42 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=2 et tw=79: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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* Henri Sivonen <hsivonen@iki.fi>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsHtml5StreamParser.h"
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#include "nsICharsetConverterManager.h"
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#include "nsICharsetAlias.h"
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#include "nsServiceManagerUtils.h"
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#include "nsEncoderDecoderUtils.h"
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#include "nsContentUtils.h"
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#include "nsHtml5Tokenizer.h"
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#include "nsIHttpChannel.h"
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#include "nsHtml5Parser.h"
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#include "nsHtml5TreeBuilder.h"
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#include "nsHtml5AtomTable.h"
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#include "nsHtml5Module.h"
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#include "nsHtml5RefPtr.h"
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#include "nsIScriptError.h"
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static NS_DEFINE_CID(kCharsetAliasCID, NS_CHARSETALIAS_CID);
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PRInt32 nsHtml5StreamParser::sTimerInitialDelay = 120;
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PRInt32 nsHtml5StreamParser::sTimerSubsequentDelay = 120;
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// static
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void
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nsHtml5StreamParser::InitializeStatics()
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{
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nsContentUtils::AddIntPrefVarCache("html5.flushtimer.initialdelay",
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&sTimerInitialDelay);
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nsContentUtils::AddIntPrefVarCache("html5.flushtimer.subsequentdelay",
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&sTimerSubsequentDelay);
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}
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/*
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* Note that nsHtml5StreamParser implements cycle collecting AddRef and
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* Release. Therefore, nsHtml5StreamParser must never be refcounted from
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* the parser thread!
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*
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* To work around this limitation, runnables posted by the main thread to the
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* parser thread hold their reference to the stream parser in an
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* nsHtml5RefPtr. Upon creation, nsHtml5RefPtr addrefs the object it holds
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* just like a regular nsRefPtr. This is OK, since the creation of the
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* runnable and the nsHtml5RefPtr happens on the main thread.
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*
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* When the runnable is done on the parser thread, the destructor of
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* nsHtml5RefPtr runs there. It doesn't call Release on the held object
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* directly. Instead, it posts another runnable back to the main thread where
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* that runnable calls Release on the wrapped object.
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*
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* When posting runnables in the other direction, the runnables have to be
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* created on the main thread when nsHtml5StreamParser is instantiated and
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* held for the lifetime of the nsHtml5StreamParser. This works, because the
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* same runnabled can be dispatched multiple times and currently runnables
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* posted from the parser thread to main thread don't need to wrap any
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* runnable-specific data. (In the other direction, the runnables most notably
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* wrap the byte data of the stream.)
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*/
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NS_IMPL_CYCLE_COLLECTING_ADDREF(nsHtml5StreamParser)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(nsHtml5StreamParser)
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NS_INTERFACE_TABLE_HEAD(nsHtml5StreamParser)
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NS_INTERFACE_TABLE2(nsHtml5StreamParser,
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nsIStreamListener,
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nsICharsetDetectionObserver)
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NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsHtml5StreamParser)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTION_CLASS(nsHtml5StreamParser)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsHtml5StreamParser)
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tmp->DropTimer();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mObserver)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mRequest)
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tmp->mOwner = nsnull;
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tmp->mExecutorFlusher = nsnull;
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tmp->mLoadFlusher = nsnull;
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tmp->mExecutor = nsnull;
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mChardet)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsHtml5StreamParser)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mObserver)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mRequest)
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if (tmp->mOwner) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mOwner");
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cb.NoteXPCOMChild(static_cast<nsIParser*> (tmp->mOwner));
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}
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// hack: count the strongly owned edge wrapped in the runnable
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if (tmp->mExecutorFlusher) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mExecutorFlusher->mExecutor");
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cb.NoteXPCOMChild(static_cast<nsIContentSink*> (tmp->mExecutor));
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}
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// hack: count the strongly owned edge wrapped in the runnable
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if (tmp->mLoadFlusher) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mLoadFlusher->mExecutor");
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cb.NoteXPCOMChild(static_cast<nsIContentSink*> (tmp->mExecutor));
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}
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// hack: count self if held by mChardet
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if (tmp->mChardet) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb,
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"mChardet->mObserver");
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cb.NoteXPCOMChild(static_cast<nsIStreamListener*>(tmp));
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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class nsHtml5ExecutorFlusher : public nsRunnable
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{
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private:
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nsRefPtr<nsHtml5TreeOpExecutor> mExecutor;
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public:
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nsHtml5ExecutorFlusher(nsHtml5TreeOpExecutor* aExecutor)
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: mExecutor(aExecutor)
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{}
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NS_IMETHODIMP Run()
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{
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mExecutor->RunFlushLoop();
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return NS_OK;
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}
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};
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class nsHtml5LoadFlusher : public nsRunnable
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{
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private:
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nsRefPtr<nsHtml5TreeOpExecutor> mExecutor;
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public:
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nsHtml5LoadFlusher(nsHtml5TreeOpExecutor* aExecutor)
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: mExecutor(aExecutor)
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{}
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NS_IMETHODIMP Run()
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{
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mExecutor->FlushSpeculativeLoads();
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return NS_OK;
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}
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};
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nsHtml5StreamParser::nsHtml5StreamParser(nsHtml5TreeOpExecutor* aExecutor,
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nsHtml5Parser* aOwner)
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: mFirstBuffer(new nsHtml5UTF16Buffer(NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE))
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, mLastBuffer(mFirstBuffer)
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, mExecutor(aExecutor)
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, mTreeBuilder(new nsHtml5TreeBuilder(mExecutor->GetStage(),
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mExecutor->GetStage()))
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, mTokenizer(new nsHtml5Tokenizer(mTreeBuilder))
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, mTokenizerMutex("nsHtml5StreamParser mTokenizerMutex")
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, mOwner(aOwner)
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, mSpeculationMutex("nsHtml5StreamParser mSpeculationMutex")
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, mTerminatedMutex("nsHtml5StreamParser mTerminatedMutex")
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, mThread(nsHtml5Module::GetStreamParserThread())
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, mExecutorFlusher(new nsHtml5ExecutorFlusher(aExecutor))
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, mLoadFlusher(new nsHtml5LoadFlusher(aExecutor))
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, mFlushTimer(do_CreateInstance("@mozilla.org/timer;1"))
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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mFlushTimer->SetTarget(mThread);
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mAtomTable.Init(); // we aren't checking for OOM anyway...
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#ifdef DEBUG
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mAtomTable.SetPermittedLookupThread(mThread);
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#endif
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mTokenizer->setInterner(&mAtomTable);
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mTokenizer->setEncodingDeclarationHandler(this);
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// Chardet instantiation adapted from nsDOMFile.
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// Chardet is initialized here even if it turns out to be useless
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// to make the chardet refcount its observer (nsHtml5StreamParser)
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// on the main thread.
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const nsAdoptingString& detectorName =
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nsContentUtils::GetLocalizedStringPref("intl.charset.detector");
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if (!detectorName.IsEmpty()) {
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nsCAutoString detectorContractID;
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detectorContractID.AssignLiteral(NS_CHARSET_DETECTOR_CONTRACTID_BASE);
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AppendUTF16toUTF8(detectorName, detectorContractID);
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if (mChardet = do_CreateInstance(detectorContractID.get())) {
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(void) mChardet->Init(this);
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}
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}
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// There's a zeroing operator new for everything else
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}
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nsHtml5StreamParser::~nsHtml5StreamParser()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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mTokenizer->end();
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NS_ASSERTION(!mFlushTimer, "Flush timer was not dropped before dtor!");
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#ifdef DEBUG
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mRequest = nsnull;
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mObserver = nsnull;
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mUnicodeDecoder = nsnull;
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mSniffingBuffer = nsnull;
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mMetaScanner = nsnull;
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mFirstBuffer = nsnull;
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mExecutor = nsnull;
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mTreeBuilder = nsnull;
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mTokenizer = nsnull;
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mOwner = nsnull;
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#endif
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}
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nsresult
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nsHtml5StreamParser::GetChannel(nsIChannel** aChannel)
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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return mRequest ? CallQueryInterface(mRequest, aChannel) :
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NS_ERROR_NOT_AVAILABLE;
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}
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NS_IMETHODIMP
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nsHtml5StreamParser::Notify(const char* aCharset, nsDetectionConfident aConf)
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{
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NS_ASSERTION(IsParserThread(), "Wrong thread!");
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if (aConf == eBestAnswer || aConf == eSureAnswer) {
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mCharset.Assign(aCharset);
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mCharsetSource = kCharsetFromAutoDetection;
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mTreeBuilder->SetDocumentCharset(mCharset, mCharsetSource);
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}
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return NS_OK;
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}
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nsresult
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nsHtml5StreamParser::SetupDecodingAndWriteSniffingBufferAndCurrentSegment(const PRUint8* aFromSegment, // can be null
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PRUint32 aCount,
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PRUint32* aWriteCount)
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{
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NS_ASSERTION(IsParserThread(), "Wrong thread!");
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nsresult rv = NS_OK;
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nsCOMPtr<nsICharsetConverterManager> convManager = do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = convManager->GetUnicodeDecoder(mCharset.get(), getter_AddRefs(mUnicodeDecoder));
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if (rv == NS_ERROR_UCONV_NOCONV) {
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mCharset.AssignLiteral("windows-1252"); // lower case is the raw form
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mCharsetSource = kCharsetFromWeakDocTypeDefault;
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rv = convManager->GetUnicodeDecoderRaw(mCharset.get(), getter_AddRefs(mUnicodeDecoder));
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mTreeBuilder->SetDocumentCharset(mCharset, mCharsetSource);
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}
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NS_ENSURE_SUCCESS(rv, rv);
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mUnicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Recover);
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return WriteSniffingBufferAndCurrentSegment(aFromSegment, aCount, aWriteCount);
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}
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nsresult
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nsHtml5StreamParser::WriteSniffingBufferAndCurrentSegment(const PRUint8* aFromSegment, // can be null
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PRUint32 aCount,
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PRUint32* aWriteCount)
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{
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NS_ASSERTION(IsParserThread(), "Wrong thread!");
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nsresult rv = NS_OK;
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if (mSniffingBuffer) {
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PRUint32 writeCount;
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rv = WriteStreamBytes(mSniffingBuffer, mSniffingLength, &writeCount);
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NS_ENSURE_SUCCESS(rv, rv);
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mSniffingBuffer = nsnull;
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}
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mMetaScanner = nsnull;
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if (aFromSegment) {
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rv = WriteStreamBytes(aFromSegment, aCount, aWriteCount);
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}
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return rv;
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}
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nsresult
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nsHtml5StreamParser::SetupDecodingFromBom(const char* aCharsetName, const char* aDecoderCharsetName)
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{
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NS_ASSERTION(IsParserThread(), "Wrong thread!");
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nsresult rv = NS_OK;
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nsCOMPtr<nsICharsetConverterManager> convManager = do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = convManager->GetUnicodeDecoderRaw(aDecoderCharsetName, getter_AddRefs(mUnicodeDecoder));
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NS_ENSURE_SUCCESS(rv, rv);
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mUnicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Recover);
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mCharset.Assign(aCharsetName);
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mCharsetSource = kCharsetFromByteOrderMark;
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mTreeBuilder->SetDocumentCharset(mCharset, mCharsetSource);
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mSniffingBuffer = nsnull;
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mMetaScanner = nsnull;
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mBomState = BOM_SNIFFING_OVER;
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return rv;
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}
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nsresult
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nsHtml5StreamParser::FinalizeSniffing(const PRUint8* aFromSegment, // can be null
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PRUint32 aCount,
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PRUint32* aWriteCount,
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PRUint32 aCountToSniffingLimit)
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{
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NS_ASSERTION(IsParserThread(), "Wrong thread!");
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// meta scan failed.
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if (mCharsetSource >= kCharsetFromHintPrevDoc) {
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return SetupDecodingAndWriteSniffingBufferAndCurrentSegment(aFromSegment, aCount, aWriteCount);
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}
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// maybe try chardet now;
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if (mChardet) {
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nsresult rv;
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PRBool dontFeed = PR_FALSE;
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if (mSniffingBuffer) {
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rv = mChardet->DoIt((const char*)mSniffingBuffer.get(), mSniffingLength, &dontFeed);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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if (!dontFeed && aFromSegment) {
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rv = mChardet->DoIt((const char*)aFromSegment, aCountToSniffingLimit, &dontFeed);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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rv = mChardet->Done();
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NS_ENSURE_SUCCESS(rv, rv);
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// fall thru; callback may have changed charset
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}
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if (mCharsetSource == kCharsetUninitialized) {
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// Hopefully this case is never needed, but dealing with it anyway
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mCharset.AssignLiteral("windows-1252");
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mCharsetSource = kCharsetFromWeakDocTypeDefault;
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mTreeBuilder->SetDocumentCharset(mCharset, mCharsetSource);
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}
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return SetupDecodingAndWriteSniffingBufferAndCurrentSegment(aFromSegment, aCount, aWriteCount);
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}
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nsresult
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nsHtml5StreamParser::SniffStreamBytes(const PRUint8* aFromSegment,
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PRUint32 aCount,
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PRUint32* aWriteCount)
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{
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NS_ASSERTION(IsParserThread(), "Wrong thread!");
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nsresult rv = NS_OK;
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PRUint32 writeCount;
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for (PRUint32 i = 0; i < aCount && mBomState != BOM_SNIFFING_OVER; i++) {
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switch (mBomState) {
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case BOM_SNIFFING_NOT_STARTED:
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NS_ASSERTION(i == 0, "Bad BOM sniffing state.");
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switch (*aFromSegment) {
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case 0xEF:
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mBomState = SEEN_UTF_8_FIRST_BYTE;
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break;
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case 0xFF:
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mBomState = SEEN_UTF_16_LE_FIRST_BYTE;
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break;
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case 0xFE:
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mBomState = SEEN_UTF_16_BE_FIRST_BYTE;
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break;
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default:
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mBomState = BOM_SNIFFING_OVER;
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break;
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}
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break;
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case SEEN_UTF_16_LE_FIRST_BYTE:
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if (aFromSegment[i] == 0xFE) {
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rv = SetupDecodingFromBom("UTF-16", "UTF-16LE"); // upper case is the raw form
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NS_ENSURE_SUCCESS(rv, rv);
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PRUint32 count = aCount - (i + 1);
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rv = WriteStreamBytes(aFromSegment + (i + 1), count, &writeCount);
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NS_ENSURE_SUCCESS(rv, rv);
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*aWriteCount = writeCount + (i + 1);
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return rv;
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}
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mBomState = BOM_SNIFFING_OVER;
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break;
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case SEEN_UTF_16_BE_FIRST_BYTE:
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if (aFromSegment[i] == 0xFF) {
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rv = SetupDecodingFromBom("UTF-16", "UTF-16BE"); // upper case is the raw form
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NS_ENSURE_SUCCESS(rv, rv);
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PRUint32 count = aCount - (i + 1);
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rv = WriteStreamBytes(aFromSegment + (i + 1), count, &writeCount);
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NS_ENSURE_SUCCESS(rv, rv);
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*aWriteCount = writeCount + (i + 1);
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return rv;
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}
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mBomState = BOM_SNIFFING_OVER;
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break;
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case SEEN_UTF_8_FIRST_BYTE:
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if (aFromSegment[i] == 0xBB) {
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mBomState = SEEN_UTF_8_SECOND_BYTE;
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} else {
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mBomState = BOM_SNIFFING_OVER;
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}
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break;
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case SEEN_UTF_8_SECOND_BYTE:
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if (aFromSegment[i] == 0xBF) {
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rv = SetupDecodingFromBom("UTF-8", "UTF-8"); // upper case is the raw form
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NS_ENSURE_SUCCESS(rv, rv);
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PRUint32 count = aCount - (i + 1);
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rv = WriteStreamBytes(aFromSegment + (i + 1), count, &writeCount);
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NS_ENSURE_SUCCESS(rv, rv);
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*aWriteCount = writeCount + (i + 1);
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return rv;
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}
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mBomState = BOM_SNIFFING_OVER;
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break;
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default:
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mBomState = BOM_SNIFFING_OVER;
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break;
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}
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}
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// if we get here, there either was no BOM or the BOM sniffing isn't complete yet
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if (!mMetaScanner) {
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mMetaScanner = new nsHtml5MetaScanner();
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}
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if (mSniffingLength + aCount >= NS_HTML5_STREAM_PARSER_SNIFFING_BUFFER_SIZE) {
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// this is the last buffer
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PRUint32 countToSniffingLimit = NS_HTML5_STREAM_PARSER_SNIFFING_BUFFER_SIZE - mSniffingLength;
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nsHtml5ByteReadable readable(aFromSegment, aFromSegment + countToSniffingLimit);
|
|
mMetaScanner->sniff(&readable, getter_AddRefs(mUnicodeDecoder), mCharset);
|
|
if (mUnicodeDecoder) {
|
|
mUnicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Recover);
|
|
// meta scan successful
|
|
mCharsetSource = kCharsetFromMetaPrescan;
|
|
mTreeBuilder->SetDocumentCharset(mCharset, mCharsetSource);
|
|
mMetaScanner = nsnull;
|
|
return WriteSniffingBufferAndCurrentSegment(aFromSegment, aCount, aWriteCount);
|
|
}
|
|
return FinalizeSniffing(aFromSegment, aCount, aWriteCount, countToSniffingLimit);
|
|
}
|
|
|
|
// not the last buffer
|
|
nsHtml5ByteReadable readable(aFromSegment, aFromSegment + aCount);
|
|
mMetaScanner->sniff(&readable, getter_AddRefs(mUnicodeDecoder), mCharset);
|
|
if (mUnicodeDecoder) {
|
|
// meta scan successful
|
|
mUnicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Recover);
|
|
mCharsetSource = kCharsetFromMetaPrescan;
|
|
mTreeBuilder->SetDocumentCharset(mCharset, mCharsetSource);
|
|
mMetaScanner = nsnull;
|
|
return WriteSniffingBufferAndCurrentSegment(aFromSegment, aCount, aWriteCount);
|
|
}
|
|
if (!mSniffingBuffer) {
|
|
mSniffingBuffer = new PRUint8[NS_HTML5_STREAM_PARSER_SNIFFING_BUFFER_SIZE];
|
|
}
|
|
memcpy(mSniffingBuffer + mSniffingLength, aFromSegment, aCount);
|
|
mSniffingLength += aCount;
|
|
*aWriteCount = aCount;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsHtml5StreamParser::WriteStreamBytes(const PRUint8* aFromSegment,
|
|
PRUint32 aCount,
|
|
PRUint32* aWriteCount)
|
|
{
|
|
NS_ASSERTION(IsParserThread(), "Wrong thread!");
|
|
// mLastBuffer always points to a buffer of the size NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE.
|
|
if (mLastBuffer->getEnd() == NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE) {
|
|
mLastBuffer = (mLastBuffer->next = new nsHtml5UTF16Buffer(NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE));
|
|
}
|
|
PRInt32 totalByteCount = 0;
|
|
for (;;) {
|
|
PRInt32 end = mLastBuffer->getEnd();
|
|
PRInt32 byteCount = aCount - totalByteCount;
|
|
PRInt32 utf16Count = NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE - end;
|
|
|
|
NS_ASSERTION(utf16Count, "Trying to convert into a buffer with no free space!");
|
|
|
|
nsresult convResult = mUnicodeDecoder->Convert((const char*)aFromSegment, &byteCount, mLastBuffer->getBuffer() + end, &utf16Count);
|
|
|
|
end += utf16Count;
|
|
mLastBuffer->setEnd(end);
|
|
totalByteCount += byteCount;
|
|
aFromSegment += byteCount;
|
|
|
|
NS_ASSERTION(end <= NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE,
|
|
"The Unicode decoder wrote too much data.");
|
|
NS_ASSERTION(byteCount >= -1, "The decoder consumed fewer than -1 bytes.");
|
|
NS_ASSERTION(byteCount > 0 || NS_FAILED(convResult),
|
|
"The decoder consumed too few bytes but did not signal an error.");
|
|
|
|
if (NS_FAILED(convResult)) {
|
|
// Using the more generic NS_FAILED test above in case there are still
|
|
// decoders around that don't use NS_ERROR_ILLEGAL_INPUT properly.
|
|
NS_ASSERTION(convResult == NS_ERROR_ILLEGAL_INPUT,
|
|
"The decoder signaled an error other than NS_ERROR_ILLEGAL_INPUT.");
|
|
|
|
// There's an illegal byte in the input. It's now the responsibility
|
|
// of this calling code to output a U+FFFD REPLACEMENT CHARACTER and
|
|
// reset the decoder.
|
|
|
|
if (totalByteCount < (PRInt32)aCount) {
|
|
// advance over the bad byte
|
|
++totalByteCount;
|
|
++aFromSegment;
|
|
} else {
|
|
NS_NOTREACHED("The decoder signaled an error but consumed all input.");
|
|
// Recovering from this situation in case there are still broken
|
|
// decoders, since nsScanner had recovery code, too.
|
|
totalByteCount = (PRInt32)aCount;
|
|
}
|
|
|
|
// Emit the REPLACEMENT CHARACTER
|
|
mLastBuffer->getBuffer()[end] = 0xFFFD;
|
|
++end;
|
|
mLastBuffer->setEnd(end);
|
|
if (end == NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE) {
|
|
mLastBuffer = mLastBuffer->next = new nsHtml5UTF16Buffer(NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE);
|
|
}
|
|
|
|
mUnicodeDecoder->Reset();
|
|
if (totalByteCount == (PRInt32)aCount) {
|
|
*aWriteCount = (PRUint32)totalByteCount;
|
|
return NS_OK;
|
|
}
|
|
} else if (convResult == NS_PARTIAL_MORE_OUTPUT) {
|
|
mLastBuffer = mLastBuffer->next = new nsHtml5UTF16Buffer(NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE);
|
|
NS_ASSERTION(totalByteCount < (PRInt32)aCount,
|
|
"The Unicode decoder consumed too many bytes.");
|
|
} else {
|
|
NS_ASSERTION(totalByteCount == (PRInt32)aCount,
|
|
"The Unicode decoder consumed the wrong number of bytes.");
|
|
*aWriteCount = (PRUint32)totalByteCount;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
}
|
|
|
|
// nsIRequestObserver methods:
|
|
nsresult
|
|
nsHtml5StreamParser::OnStartRequest(nsIRequest* aRequest, nsISupports* aContext)
|
|
{
|
|
NS_PRECONDITION(STREAM_NOT_STARTED == mStreamState,
|
|
"Got OnStartRequest when the stream had already started.");
|
|
NS_PRECONDITION(!mExecutor->HasStarted(),
|
|
"Got OnStartRequest at the wrong stage in the executor life cycle.");
|
|
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
|
|
if (mObserver) {
|
|
mObserver->OnStartRequest(aRequest, aContext);
|
|
}
|
|
mRequest = aRequest;
|
|
|
|
mStreamState = STREAM_BEING_READ;
|
|
|
|
PRBool scriptingEnabled = mExecutor->IsScriptEnabled();
|
|
mOwner->StartTokenizer(scriptingEnabled);
|
|
mTreeBuilder->setScriptingEnabled(scriptingEnabled);
|
|
mTokenizer->start();
|
|
mExecutor->Start();
|
|
mExecutor->StartReadingFromStage();
|
|
/*
|
|
* If you move the following line, be very careful not to cause
|
|
* WillBuildModel to be called before the document has had its
|
|
* script global object set.
|
|
*/
|
|
mExecutor->WillBuildModel(eDTDMode_unknown);
|
|
|
|
nsresult rv = NS_OK;
|
|
|
|
mReparseForbidden = PR_FALSE;
|
|
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(mRequest, &rv));
|
|
if (NS_SUCCEEDED(rv)) {
|
|
nsCAutoString method;
|
|
httpChannel->GetRequestMethod(method);
|
|
// XXX does Necko have a way to renavigate POST, etc. without hitting
|
|
// the network?
|
|
if (!method.EqualsLiteral("GET")) {
|
|
// This is the old Gecko behavior but the HTML5 spec disagrees.
|
|
// Don't reparse on POST.
|
|
mReparseForbidden = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
if (mCharsetSource < kCharsetFromChannel) {
|
|
// we aren't ready to commit to an encoding yet
|
|
// leave converter uninstantiated for now
|
|
return NS_OK;
|
|
}
|
|
|
|
nsCOMPtr<nsICharsetConverterManager> convManager = do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &rv);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
rv = convManager->GetUnicodeDecoder(mCharset.get(), getter_AddRefs(mUnicodeDecoder));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
mUnicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Recover);
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsHtml5StreamParser::DoStopRequest()
|
|
{
|
|
NS_ASSERTION(IsParserThread(), "Wrong thread!");
|
|
NS_PRECONDITION(STREAM_BEING_READ == mStreamState,
|
|
"Stream ended without being open.");
|
|
mTokenizerMutex.AssertCurrentThreadOwns();
|
|
|
|
if (IsTerminated()) {
|
|
return;
|
|
}
|
|
|
|
if (!mUnicodeDecoder) {
|
|
PRUint32 writeCount;
|
|
FinalizeSniffing(nsnull, 0, &writeCount, 0);
|
|
// dropped nsresult here
|
|
}
|
|
|
|
mStreamState = STREAM_ENDED;
|
|
|
|
if (IsTerminatedOrInterrupted()) {
|
|
return;
|
|
}
|
|
|
|
ParseAvailableData();
|
|
}
|
|
|
|
class nsHtml5RequestStopper : public nsRunnable
|
|
{
|
|
private:
|
|
nsHtml5RefPtr<nsHtml5StreamParser> mStreamParser;
|
|
public:
|
|
nsHtml5RequestStopper(nsHtml5StreamParser* aStreamParser)
|
|
: mStreamParser(aStreamParser)
|
|
{}
|
|
NS_IMETHODIMP Run()
|
|
{
|
|
mozilla::MutexAutoLock autoLock(mStreamParser->mTokenizerMutex);
|
|
mStreamParser->DoStopRequest();
|
|
return NS_OK;
|
|
}
|
|
};
|
|
|
|
nsresult
|
|
nsHtml5StreamParser::OnStopRequest(nsIRequest* aRequest,
|
|
nsISupports* aContext,
|
|
nsresult status)
|
|
{
|
|
NS_ASSERTION(mRequest == aRequest, "Got Stop on wrong stream.");
|
|
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
|
|
if (mObserver) {
|
|
mObserver->OnStopRequest(aRequest, aContext, status);
|
|
}
|
|
nsCOMPtr<nsIRunnable> stopper = new nsHtml5RequestStopper(this);
|
|
if (NS_FAILED(mThread->Dispatch(stopper, nsIThread::DISPATCH_NORMAL))) {
|
|
NS_WARNING("Dispatching StopRequest event failed.");
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsHtml5StreamParser::DoDataAvailable(PRUint8* aBuffer, PRUint32 aLength)
|
|
{
|
|
NS_ASSERTION(IsParserThread(), "Wrong thread!");
|
|
NS_PRECONDITION(STREAM_BEING_READ == mStreamState,
|
|
"DoDataAvailable called when stream not open.");
|
|
mTokenizerMutex.AssertCurrentThreadOwns();
|
|
|
|
if (IsTerminated()) {
|
|
return;
|
|
}
|
|
|
|
PRUint32 writeCount;
|
|
HasDecoder() ? WriteStreamBytes(aBuffer, aLength, &writeCount) :
|
|
SniffStreamBytes(aBuffer, aLength, &writeCount);
|
|
// dropping nsresult here
|
|
NS_ASSERTION(writeCount == aLength, "Wrong number of stream bytes written/sniffed.");
|
|
|
|
if (IsTerminatedOrInterrupted()) {
|
|
return;
|
|
}
|
|
|
|
ParseAvailableData();
|
|
|
|
if (mFlushTimerArmed || mSpeculating) {
|
|
return;
|
|
}
|
|
|
|
mFlushTimer->InitWithFuncCallback(nsHtml5StreamParser::TimerCallback,
|
|
static_cast<void*> (this),
|
|
mFlushTimerEverFired ?
|
|
sTimerInitialDelay :
|
|
sTimerSubsequentDelay,
|
|
nsITimer::TYPE_ONE_SHOT);
|
|
mFlushTimerArmed = PR_TRUE;
|
|
}
|
|
|
|
class nsHtml5DataAvailable : public nsRunnable
|
|
{
|
|
private:
|
|
nsHtml5RefPtr<nsHtml5StreamParser> mStreamParser;
|
|
nsAutoArrayPtr<PRUint8> mData;
|
|
PRUint32 mLength;
|
|
public:
|
|
nsHtml5DataAvailable(nsHtml5StreamParser* aStreamParser,
|
|
PRUint8* aData,
|
|
PRUint32 aLength)
|
|
: mStreamParser(aStreamParser)
|
|
, mData(aData)
|
|
, mLength(aLength)
|
|
{}
|
|
NS_IMETHODIMP Run()
|
|
{
|
|
mozilla::MutexAutoLock autoLock(mStreamParser->mTokenizerMutex);
|
|
mStreamParser->DoDataAvailable(mData, mLength);
|
|
return NS_OK;
|
|
}
|
|
};
|
|
|
|
// nsIStreamListener method:
|
|
nsresult
|
|
nsHtml5StreamParser::OnDataAvailable(nsIRequest* aRequest,
|
|
nsISupports* aContext,
|
|
nsIInputStream* aInStream,
|
|
PRUint32 aSourceOffset,
|
|
PRUint32 aLength)
|
|
{
|
|
NS_ASSERTION(mRequest == aRequest, "Got data on wrong stream.");
|
|
PRUint32 totalRead;
|
|
nsAutoArrayPtr<PRUint8> data(new PRUint8[aLength]);
|
|
nsresult rv = aInStream->Read(reinterpret_cast<char*>(data.get()),
|
|
aLength, &totalRead);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
NS_ASSERTION(totalRead <= aLength, "Read more bytes than were available?");
|
|
nsCOMPtr<nsIRunnable> dataAvailable = new nsHtml5DataAvailable(this,
|
|
data.forget(),
|
|
totalRead);
|
|
if (NS_FAILED(mThread->Dispatch(dataAvailable, nsIThread::DISPATCH_NORMAL))) {
|
|
NS_WARNING("Dispatching DataAvailable event failed.");
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
nsHtml5StreamParser::internalEncodingDeclaration(nsString* aEncoding)
|
|
{
|
|
// This code needs to stay in sync with
|
|
// nsHtml5MetaScanner::tryCharset. Unfortunately, the
|
|
// trickery with member fields there leads to some copy-paste reuse. :-(
|
|
NS_ASSERTION(IsParserThread(), "Wrong thread!");
|
|
if (mCharsetSource >= kCharsetFromMetaTag) { // this threshold corresponds to "confident" in the HTML5 spec
|
|
return;
|
|
}
|
|
|
|
if (mReparseForbidden) {
|
|
return; // not reparsing even if we wanted to
|
|
}
|
|
|
|
nsCAutoString newEncoding;
|
|
CopyUTF16toUTF8(*aEncoding, newEncoding);
|
|
// XXX spec says only UTF-16
|
|
if (newEncoding.LowerCaseEqualsLiteral("utf-16") ||
|
|
newEncoding.LowerCaseEqualsLiteral("utf-16be") ||
|
|
newEncoding.LowerCaseEqualsLiteral("utf-16le")) {
|
|
newEncoding.Assign("UTF-8");
|
|
}
|
|
|
|
nsresult rv = NS_OK;
|
|
nsCOMPtr<nsICharsetAlias> calias(do_GetService(kCharsetAliasCID, &rv));
|
|
if (NS_FAILED(rv)) {
|
|
NS_NOTREACHED("Charset alias service not available.");
|
|
return;
|
|
}
|
|
PRBool eq;
|
|
rv = calias->Equals(newEncoding, mCharset, &eq);
|
|
if (NS_FAILED(rv)) {
|
|
NS_NOTREACHED("Charset name equality check failed.");
|
|
return;
|
|
}
|
|
if (eq) {
|
|
mCharsetSource = kCharsetFromMetaTag; // become confident
|
|
return;
|
|
}
|
|
|
|
// XXX check HTML5 non-IANA aliases here
|
|
|
|
nsCAutoString preferred;
|
|
|
|
rv = calias->GetPreferred(newEncoding, preferred);
|
|
if (NS_FAILED(rv)) {
|
|
// the encoding name is bogus
|
|
return;
|
|
}
|
|
|
|
if (preferred.LowerCaseEqualsLiteral("utf-16") ||
|
|
preferred.LowerCaseEqualsLiteral("utf-16be") ||
|
|
preferred.LowerCaseEqualsLiteral("utf-16le") ||
|
|
preferred.LowerCaseEqualsLiteral("utf-32") ||
|
|
preferred.LowerCaseEqualsLiteral("utf-32be") ||
|
|
preferred.LowerCaseEqualsLiteral("utf-32le") ||
|
|
preferred.LowerCaseEqualsLiteral("utf-7") ||
|
|
preferred.LowerCaseEqualsLiteral("jis_x0212-1990") ||
|
|
preferred.LowerCaseEqualsLiteral("x-jis0208") ||
|
|
preferred.LowerCaseEqualsLiteral("x-imap4-modified-utf7") ||
|
|
preferred.LowerCaseEqualsLiteral("x-user-defined")) {
|
|
// Not a rough ASCII superset
|
|
return;
|
|
}
|
|
|
|
mTreeBuilder->NeedsCharsetSwitchTo(preferred);
|
|
FlushTreeOpsAndDisarmTimer();
|
|
Interrupt();
|
|
// the tree op executor will cause the stream parser to terminate
|
|
// if the charset switch request is accepted or it'll uninterrupt
|
|
// if the request failed.
|
|
}
|
|
|
|
void
|
|
nsHtml5StreamParser::FlushTreeOpsAndDisarmTimer()
|
|
{
|
|
NS_ASSERTION(IsParserThread(), "Wrong thread!");
|
|
if (mFlushTimerArmed) {
|
|
// avoid calling Cancel if the flush timer isn't armed to avoid acquiring
|
|
// a mutex
|
|
mFlushTimer->Cancel();
|
|
mFlushTimerArmed = PR_FALSE;
|
|
}
|
|
mTreeBuilder->Flush();
|
|
if (NS_FAILED(NS_DispatchToMainThread(mExecutorFlusher))) {
|
|
NS_WARNING("failed to dispatch executor flush event");
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHtml5StreamParser::ParseAvailableData()
|
|
{
|
|
NS_ASSERTION(IsParserThread(), "Wrong thread!");
|
|
mTokenizerMutex.AssertCurrentThreadOwns();
|
|
|
|
if (IsTerminatedOrInterrupted()) {
|
|
return;
|
|
}
|
|
|
|
for (;;) {
|
|
if (!mFirstBuffer->hasMore()) {
|
|
if (mFirstBuffer == mLastBuffer) {
|
|
switch (mStreamState) {
|
|
case STREAM_BEING_READ:
|
|
// never release the last buffer.
|
|
if (!mSpeculating) {
|
|
// reuse buffer space if not speculating
|
|
mFirstBuffer->setStart(0);
|
|
mFirstBuffer->setEnd(0);
|
|
}
|
|
mTreeBuilder->FlushLoads();
|
|
// Dispatch this runnable unconditionally, because the loads
|
|
// that need flushing may have been flushed earlier even if the
|
|
// flush right above here did nothing.
|
|
if (NS_FAILED(NS_DispatchToMainThread(mLoadFlusher))) {
|
|
NS_WARNING("failed to dispatch load flush event");
|
|
}
|
|
return; // no more data for now but expecting more
|
|
case STREAM_ENDED:
|
|
if (mAtEOF) {
|
|
return;
|
|
}
|
|
mAtEOF = PR_TRUE;
|
|
mTokenizer->eof();
|
|
mTreeBuilder->StreamEnded();
|
|
FlushTreeOpsAndDisarmTimer();
|
|
return; // no more data and not expecting more
|
|
default:
|
|
NS_NOTREACHED("It should be impossible to reach this.");
|
|
return;
|
|
}
|
|
}
|
|
mFirstBuffer = mFirstBuffer->next;
|
|
continue;
|
|
}
|
|
|
|
// now we have a non-empty buffer
|
|
mFirstBuffer->adjust(mLastWasCR);
|
|
mLastWasCR = PR_FALSE;
|
|
if (mFirstBuffer->hasMore()) {
|
|
mLastWasCR = mTokenizer->tokenizeBuffer(mFirstBuffer);
|
|
// At this point, internalEncodingDeclaration() may have called
|
|
// Terminate, but that never happens together with script.
|
|
// Can't assert that here, though, because it's possible that the main
|
|
// thread has called Terminate() while this thread was parsing.
|
|
if (mTreeBuilder->HasScript()) {
|
|
mozilla::MutexAutoLock speculationAutoLock(mSpeculationMutex);
|
|
nsHtml5Speculation* speculation =
|
|
new nsHtml5Speculation(mFirstBuffer,
|
|
mFirstBuffer->getStart(),
|
|
mTokenizer->getLineNumber(),
|
|
mTreeBuilder->newSnapshot());
|
|
mTreeBuilder->AddSnapshotToScript(speculation->GetSnapshot(),
|
|
speculation->GetStartLineNumber());
|
|
FlushTreeOpsAndDisarmTimer();
|
|
mTreeBuilder->SetOpSink(speculation);
|
|
mSpeculations.AppendElement(speculation); // adopts the pointer
|
|
mSpeculating = PR_TRUE;
|
|
}
|
|
if (IsTerminatedOrInterrupted()) {
|
|
return;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
|
|
class nsHtml5StreamParserContinuation : public nsRunnable
|
|
{
|
|
private:
|
|
nsHtml5RefPtr<nsHtml5StreamParser> mStreamParser;
|
|
public:
|
|
nsHtml5StreamParserContinuation(nsHtml5StreamParser* aStreamParser)
|
|
: mStreamParser(aStreamParser)
|
|
{}
|
|
NS_IMETHODIMP Run()
|
|
{
|
|
mozilla::MutexAutoLock autoLock(mStreamParser->mTokenizerMutex);
|
|
mStreamParser->Uninterrupt();
|
|
mStreamParser->ParseAvailableData();
|
|
return NS_OK;
|
|
}
|
|
};
|
|
|
|
void
|
|
nsHtml5StreamParser::ContinueAfterScripts(nsHtml5Tokenizer* aTokenizer,
|
|
nsHtml5TreeBuilder* aTreeBuilder,
|
|
PRBool aLastWasCR)
|
|
{
|
|
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
|
|
#ifdef DEBUG
|
|
mExecutor->AssertStageEmpty();
|
|
#endif
|
|
PRBool speculationFailed = PR_FALSE;
|
|
{
|
|
mozilla::MutexAutoLock speculationAutoLock(mSpeculationMutex);
|
|
if (mSpeculations.IsEmpty()) {
|
|
NS_NOTREACHED("ContinueAfterScripts called without speculations.");
|
|
return;
|
|
}
|
|
nsHtml5Speculation* speculation = mSpeculations.ElementAt(0);
|
|
if (aLastWasCR ||
|
|
!aTokenizer->isInDataState() ||
|
|
!aTreeBuilder->snapshotMatches(speculation->GetSnapshot())) {
|
|
speculationFailed = PR_TRUE;
|
|
// We've got a failed speculation :-(
|
|
Interrupt(); // Make the parser thread release the tokenizer mutex sooner
|
|
// now fall out of the speculationAutoLock into the tokenizerAutoLock block
|
|
} else {
|
|
// We've got a successful speculation!
|
|
if (mSpeculations.Length() > 1) {
|
|
// the first speculation isn't the current speculation, so there's
|
|
// no need to bother the parser thread.
|
|
speculation->FlushToSink(mExecutor);
|
|
NS_ASSERTION(!mExecutor->IsScriptExecuting(),
|
|
"ParseUntilBlocked() was supposed to ensure we don't come "
|
|
"here when scripts are executing.");
|
|
NS_ASSERTION(mExecutor->IsInFlushLoop(), "How are we here if "
|
|
"RunFlushLoop() didn't call ParseUntilBlocked() which is the "
|
|
"only caller of this method?");
|
|
mSpeculations.RemoveElementAt(0);
|
|
return;
|
|
}
|
|
// else
|
|
Interrupt(); // Make the parser thread release the tokenizer mutex sooner
|
|
|
|
// now fall through
|
|
// the first speculation is the current speculation. Need to
|
|
// release the the speculation mutex and acquire the tokenizer
|
|
// mutex. (Just acquiring the other mutex here would deadlock)
|
|
}
|
|
}
|
|
{
|
|
mozilla::MutexAutoLock tokenizerAutoLock(mTokenizerMutex);
|
|
#ifdef DEBUG
|
|
{
|
|
nsCOMPtr<nsIThread> mainThread;
|
|
NS_GetMainThread(getter_AddRefs(mainThread));
|
|
mAtomTable.SetPermittedLookupThread(mainThread);
|
|
}
|
|
#endif
|
|
// In principle, the speculation mutex should be acquired here,
|
|
// but there's no point, because the parser thread only acquires it
|
|
// when it has also acquired the tokenizer mutex and we are already
|
|
// holding the tokenizer mutex.
|
|
if (speculationFailed) {
|
|
// Rewind the stream
|
|
mAtEOF = PR_FALSE;
|
|
nsHtml5Speculation* speculation = mSpeculations.ElementAt(0);
|
|
mFirstBuffer = speculation->GetBuffer();
|
|
mFirstBuffer->setStart(speculation->GetStart());
|
|
mTokenizer->setLineNumber(speculation->GetStartLineNumber());
|
|
|
|
nsContentUtils::ReportToConsole(nsContentUtils::eDOM_PROPERTIES,
|
|
"SpeculationFailed",
|
|
nsnull, 0,
|
|
mExecutor->GetDocument()->GetDocumentURI(),
|
|
EmptyString(),
|
|
speculation->GetStartLineNumber(),
|
|
0,
|
|
nsIScriptError::warningFlag,
|
|
"DOM Events");
|
|
|
|
nsHtml5UTF16Buffer* buffer = mFirstBuffer->next;
|
|
while (buffer) {
|
|
buffer->setStart(0);
|
|
buffer = buffer->next;
|
|
}
|
|
|
|
mSpeculations.Clear(); // potentially a huge number of destructors
|
|
// run here synchronously on the main thread...
|
|
|
|
mTreeBuilder->flushCharacters(); // empty the pending buffer
|
|
mTreeBuilder->ClearOps(); // now get rid of the failed ops
|
|
|
|
mTreeBuilder->SetOpSink(mExecutor->GetStage());
|
|
mExecutor->StartReadingFromStage();
|
|
mSpeculating = PR_FALSE;
|
|
|
|
// Copy state over
|
|
mLastWasCR = aLastWasCR;
|
|
mTokenizer->loadState(aTokenizer);
|
|
mTreeBuilder->loadState(aTreeBuilder, &mAtomTable);
|
|
} else {
|
|
// We've got a successful speculation and at least a moment ago it was
|
|
// the current speculation
|
|
mSpeculations.ElementAt(0)->FlushToSink(mExecutor);
|
|
NS_ASSERTION(!mExecutor->IsScriptExecuting(),
|
|
"ParseUntilBlocked() was supposed to ensure we don't come "
|
|
"here when scripts are executing.");
|
|
NS_ASSERTION(mExecutor->IsInFlushLoop(), "How are we here if "
|
|
"RunFlushLoop() didn't call ParseUntilBlocked() which is the "
|
|
"only caller of this method?");
|
|
mSpeculations.RemoveElementAt(0);
|
|
if (mSpeculations.IsEmpty()) {
|
|
// yes, it was still the only speculation. Now stop speculating
|
|
if (mTreeBuilder->IsDiscretionaryFlushSafe()) {
|
|
// However, before telling the executor to read from stage, flush
|
|
// any pending ops straight to the executor, because otherwise
|
|
// they remain unflushed until we get more data from the network.
|
|
mTreeBuilder->SetOpSink(mExecutor);
|
|
mTreeBuilder->Flush();
|
|
}
|
|
mTreeBuilder->SetOpSink(mExecutor->GetStage());
|
|
mExecutor->StartReadingFromStage();
|
|
mSpeculating = PR_FALSE;
|
|
}
|
|
}
|
|
nsCOMPtr<nsIRunnable> event = new nsHtml5StreamParserContinuation(this);
|
|
if (NS_FAILED(mThread->Dispatch(event, nsIThread::DISPATCH_NORMAL))) {
|
|
NS_WARNING("Failed to dispatch nsHtml5StreamParserContinuation");
|
|
}
|
|
// A stream event might run before this event runs, but that's harmless.
|
|
#ifdef DEBUG
|
|
mAtomTable.SetPermittedLookupThread(mThread);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHtml5StreamParser::ContinueAfterFailedCharsetSwitch()
|
|
{
|
|
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
|
|
nsCOMPtr<nsIRunnable> event = new nsHtml5StreamParserContinuation(this);
|
|
if (NS_FAILED(mThread->Dispatch(event, nsIThread::DISPATCH_NORMAL))) {
|
|
NS_WARNING("Failed to dispatch nsHtml5StreamParserContinuation");
|
|
}
|
|
}
|
|
|
|
class nsHtml5TimerKungFu : public nsRunnable
|
|
{
|
|
private:
|
|
nsHtml5RefPtr<nsHtml5StreamParser> mStreamParser;
|
|
public:
|
|
nsHtml5TimerKungFu(nsHtml5StreamParser* aStreamParser)
|
|
: mStreamParser(aStreamParser)
|
|
{}
|
|
NS_IMETHODIMP Run()
|
|
{
|
|
if (mStreamParser->mFlushTimer) {
|
|
mStreamParser->mFlushTimer->Cancel();
|
|
mStreamParser->mFlushTimer = nsnull;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
};
|
|
|
|
void
|
|
nsHtml5StreamParser::DropTimer()
|
|
{
|
|
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
|
|
/*
|
|
* Simply nulling out the timer wouldn't work, because if the timer is
|
|
* armed, it needs to be canceled first. Simply canceling it first wouldn't
|
|
* work, because nsTimerImpl::Cancel is not safe for calling from outside
|
|
* the thread where nsTimerImpl::Fire would run. It's not safe to
|
|
* dispatch a runnable to cancel the timer from the destructor of this
|
|
* class, because the timer has a weak (void*) pointer back to this instance
|
|
* of the stream parser and having the timer fire before the runnable
|
|
* cancels it would make the timer access a deleted object.
|
|
*
|
|
* This DropTimer method addresses these issues. This method must be called
|
|
* on the main thread before the destructor of this class is reached.
|
|
* The nsHtml5TimerKungFu object has an nsHtml5RefPtr that addrefs this
|
|
* stream parser object to keep it alive until the runnable is done.
|
|
* The runnable cancels the timer on the parser thread, drops the timer
|
|
* and lets nsHtml5RefPtr send a runnable back to the main thread to
|
|
* release the stream parser.
|
|
*/
|
|
if (mFlushTimer) {
|
|
nsCOMPtr<nsIRunnable> event = new nsHtml5TimerKungFu(this);
|
|
if (NS_FAILED(mThread->Dispatch(event, nsIThread::DISPATCH_NORMAL))) {
|
|
NS_WARNING("Failed to dispatch TimerKungFu event");
|
|
}
|
|
}
|
|
}
|
|
|
|
// Using a static, because the method name Notify is taken by the chardet
|
|
// callback.
|
|
void
|
|
nsHtml5StreamParser::TimerCallback(nsITimer* aTimer, void* aClosure)
|
|
{
|
|
(static_cast<nsHtml5StreamParser*> (aClosure))->TimerFlush();
|
|
}
|
|
|
|
void
|
|
nsHtml5StreamParser::TimerFlush()
|
|
{
|
|
NS_ASSERTION(IsParserThread(), "Wrong thread!");
|
|
mozilla::MutexAutoLock autoLock(mTokenizerMutex);
|
|
|
|
NS_ASSERTION(!mSpeculating, "Flush timer fired while speculating.");
|
|
|
|
// The timer fired if we got here. No need to cancel it. Mark it as
|
|
// not armed, though.
|
|
mFlushTimerArmed = PR_FALSE;
|
|
|
|
mFlushTimerEverFired = PR_TRUE;
|
|
|
|
if (IsTerminatedOrInterrupted()) {
|
|
return;
|
|
}
|
|
|
|
// we aren't speculating and we don't know when new data is
|
|
// going to arrive. Send data to the main thread.
|
|
// However, don't do if the current element on the stack is a
|
|
// foster-parenting element and there's pending text, because flushing in
|
|
// that case would make the tree shape dependent on where the flush points
|
|
// fall.
|
|
if (mTreeBuilder->IsDiscretionaryFlushSafe()) {
|
|
if (mTreeBuilder->Flush()) {
|
|
if (NS_FAILED(NS_DispatchToMainThread(mExecutorFlusher))) {
|
|
NS_WARNING("failed to dispatch executor flush event");
|
|
}
|
|
}
|
|
}
|
|
}
|