The Tor Browser: layout/style/ErrorReporter.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /* diagnostic reporting for CSS style sheet parser */

     8 #include "mozilla/css/ErrorReporter.h"

     9 #include "mozilla/css/Loader.h"

    10 #include "mozilla/Preferences.h"

    11 #include "mozilla/Services.h"

    12 #include "nsCSSScanner.h"

    13 #include "nsCSSStyleSheet.h"

    14 #include "nsIConsoleService.h"

    15 #include "nsIDocument.h"

    16 #include "nsIFactory.h"

    17 #include "nsIScriptError.h"

    18 #include "nsIStringBundle.h"

    19 #include "nsServiceManagerUtils.h"

    20 #include "nsStyleUtil.h"

    21 #include "nsThreadUtils.h"

    23 #ifdef CSS_REPORT_PARSE_ERRORS

    25 using mozilla::Preferences;

    26 namespace services = mozilla::services;

    28 namespace {

    29 class ShortTermURISpecCache : public nsRunnable {

    30 public:

    31   ShortTermURISpecCache() : mPending(false) {}

    33   nsString const& GetSpec(nsIURI* aURI) {

    34     if (mURI != aURI) {

    35       mURI = aURI;

    37       nsAutoCString cSpec;

    38       mURI->GetSpec(cSpec);

    39       CopyUTF8toUTF16(cSpec, mSpec);

    40     }

    41     return mSpec;

    42   }

    44   bool IsInUse() const { return mURI != nullptr; }

    45   bool IsPending() const { return mPending; }

    46   void SetPending() { mPending = true; }

    48   // When invoked as a runnable, zap the cache.

    49   NS_IMETHOD Run() {

    50     mURI = nullptr;

    51     mSpec.Truncate();

    52     mPending = false;

    53     return NS_OK;

    54   }

    56 private:

    57   nsCOMPtr<nsIURI> mURI;

    58   nsString mSpec;

    59   bool mPending;

    60 };

    61 }

    63 static bool sReportErrors;

    64 static nsIConsoleService *sConsoleService;

    65 static nsIFactory *sScriptErrorFactory;

    66 static nsIStringBundle *sStringBundle;

    67 static ShortTermURISpecCache *sSpecCache;

    69 #define CSS_ERRORS_PREF "layout.css.report_errors"

    71 static bool

    72 InitGlobals()

    73 {

    74   NS_ABORT_IF_FALSE(!sConsoleService && !sScriptErrorFactory && !sStringBundle,

    75                     "should not have been called");

    77   if (NS_FAILED(Preferences::AddBoolVarCache(&sReportErrors, CSS_ERRORS_PREF,

    78                                              true))) {

    79     return false;

    80   }

    82   nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);

    83   if (!cs) {

    84     return false;

    85   }

    87   nsCOMPtr<nsIFactory> sf = do_GetClassObject(NS_SCRIPTERROR_CONTRACTID);

    88   if (!sf) {

    89     return false;

    90   }

    92   nsCOMPtr<nsIStringBundleService> sbs = services::GetStringBundleService();

    93   if (!sbs) {

    94     return false;

    95   }

    97   nsCOMPtr<nsIStringBundle> sb;

    98   nsresult rv = sbs->CreateBundle("chrome://global/locale/css.properties",

    99                                   getter_AddRefs(sb));

   100   if (NS_FAILED(rv) || !sb) {

   101     return false;

   102   }

   104   cs.forget(&sConsoleService);

   105   sf.forget(&sScriptErrorFactory);

   106   sb.forget(&sStringBundle);

   108   return true;

   109 }

   111 static inline bool

   112 ShouldReportErrors()

   113 {

   114   if (!sConsoleService) {

   115     if (!InitGlobals()) {

   116       return false;

   117     }

   118   }

   119   return sReportErrors;

   120 }

   122 namespace mozilla {

   123 namespace css {

   125 /* static */ void

   126 ErrorReporter::ReleaseGlobals()

   127 {

   128   NS_IF_RELEASE(sConsoleService);

   129   NS_IF_RELEASE(sScriptErrorFactory);

   130   NS_IF_RELEASE(sStringBundle);

   131   NS_IF_RELEASE(sSpecCache);

   132 }

   134 ErrorReporter::ErrorReporter(const nsCSSScanner& aScanner,

   135                              const nsCSSStyleSheet* aSheet,

   136                              const Loader* aLoader,

   137                              nsIURI* aURI)

   138   : mScanner(&aScanner), mSheet(aSheet), mLoader(aLoader), mURI(aURI),

   139     mInnerWindowID(0), mErrorLineNumber(0), mPrevErrorLineNumber(0),

   140     mErrorColNumber(0)

   141 {

   142 }

   144 ErrorReporter::~ErrorReporter()

   145 {

   146   // Schedule deferred cleanup for cached data. We want to strike a

   147   // balance between performance and memory usage, so we only allow

   148   // short-term caching.

   149   if (sSpecCache && sSpecCache->IsInUse() && !sSpecCache->IsPending()) {

   150     if (NS_FAILED(NS_DispatchToCurrentThread(sSpecCache))) {

   151       // Peform the "deferred" cleanup immediately if the dispatch fails.

   152       sSpecCache->Run();

   153     } else {

   154       sSpecCache->SetPending();

   155     }

   156   }

   157 }

   159 void

   160 ErrorReporter::OutputError()

   161 {

   162   if (mError.IsEmpty()) {

   163     return;

   164   }

   165   if (!ShouldReportErrors()) {

   166     ClearError();

   167     return;

   168   }

   170   if (mInnerWindowID == 0 && (mSheet || mLoader)) {

   171     if (mSheet) {

   172       mInnerWindowID = mSheet->FindOwningWindowInnerID();

   173     }

   174     if (mInnerWindowID == 0 && mLoader) {

   175       nsIDocument* doc = mLoader->GetDocument();

   176       if (doc) {

   177         mInnerWindowID = doc->InnerWindowID();

   178       }

   179     }

   180     // don't attempt this again, even if we failed

   181     mSheet = nullptr;

   182     mLoader = nullptr;

   183   }

   185   if (mFileName.IsEmpty()) {

   186     if (mURI) {

   187       if (!sSpecCache) {

   188         sSpecCache = new ShortTermURISpecCache;

   189         NS_ADDREF(sSpecCache);

   190       }

   191       mFileName = sSpecCache->GetSpec(mURI);

   192       mURI = nullptr;

   193     } else {

   194       mFileName.AssignLiteral("from DOM");

   195     }

   196   }

   198   nsresult rv;

   199   nsCOMPtr<nsIScriptError> errorObject =

   200     do_CreateInstance(sScriptErrorFactory, &rv);

   202   if (NS_SUCCEEDED(rv)) {

   203     rv = errorObject->InitWithWindowID(mError,

   204                                        mFileName,

   205                                        mErrorLine,

   206                                        mErrorLineNumber,

   207                                        mErrorColNumber,

   208                                        nsIScriptError::warningFlag,

   209                                        "CSS Parser",

   210                                        mInnerWindowID);

   211     if (NS_SUCCEEDED(rv)) {

   212       sConsoleService->LogMessage(errorObject);

   213     }

   214   }

   216   ClearError();

   217 }

   219 void

   220 ErrorReporter::OutputError(uint32_t aLineNumber, uint32_t aLineOffset)

   221 {

   222   mErrorLineNumber = aLineNumber;

   223   mErrorColNumber = aLineOffset;

   224   OutputError();

   225 }

   227 void

   228 ErrorReporter::ClearError()

   229 {

   230   mError.Truncate();

   231 }

   233 void

   234 ErrorReporter::AddToError(const nsString &aErrorText)

   235 {

   236   if (!ShouldReportErrors()) return;

   238   if (mError.IsEmpty()) {

   239     mError = aErrorText;

   240     mErrorLineNumber = mScanner->GetLineNumber();

   241     mErrorColNumber = mScanner->GetColumnNumber();

   242     // Retrieve the error line once per line, and reuse the same nsString

   243     // for all errors on that line.  That causes the text of the line to

   244     // be shared among all the nsIScriptError objects.

   245     if (mErrorLine.IsEmpty() || mErrorLineNumber != mPrevErrorLineNumber) {

   246       mErrorLine = mScanner->GetCurrentLine();

   247       mPrevErrorLineNumber = mErrorLineNumber;

   248     }

   249   } else {

   250     mError.AppendLiteral("  ");

   251     mError.Append(aErrorText);

   252   }

   253 }

   255 void

   256 ErrorReporter::ReportUnexpected(const char *aMessage)

   257 {

   258   if (!ShouldReportErrors()) return;

   260   nsAutoString str;

   261   sStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),

   262                                    getter_Copies(str));

   263   AddToError(str);

   264 }

   266 void

   267 ErrorReporter::ReportUnexpected(const char *aMessage,

   268                                 const nsString &aParam)

   269 {

   270   if (!ShouldReportErrors()) return;

   272   nsAutoString qparam;

   273   nsStyleUtil::AppendEscapedCSSIdent(aParam, qparam);

   274   const char16_t *params[1] = { qparam.get() };

   276   nsAutoString str;

   277   sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),

   278                                       params, ArrayLength(params),

   279                                       getter_Copies(str));

   280   AddToError(str);

   281 }

   283 void

   284 ErrorReporter::ReportUnexpected(const char *aMessage,

   285                                 const nsCSSToken &aToken)

   286 {

   287   if (!ShouldReportErrors()) return;

   289   nsAutoString tokenString;

   290   aToken.AppendToString(tokenString);

   291   const char16_t *params[1] = { tokenString.get() };

   293   nsAutoString str;

   294   sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),

   295                                       params, ArrayLength(params),

   296                                       getter_Copies(str));

   297   AddToError(str);

   298 }

   300 void

   301 ErrorReporter::ReportUnexpected(const char *aMessage,

   302                                 const nsCSSToken &aToken,

   303                                 char16_t aChar)

   304 {

   305   if (!ShouldReportErrors()) return;

   307   nsAutoString tokenString;

   308   aToken.AppendToString(tokenString);

   309   const char16_t charStr[2] = { aChar, 0 };

   310   const char16_t *params[2] = { tokenString.get(), charStr };

   312   nsAutoString str;

   313   sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),

   314                                       params, ArrayLength(params),

   315                                       getter_Copies(str));

   316   AddToError(str);

   317 }

   319 void

   320 ErrorReporter::ReportUnexpectedEOF(const char *aMessage)

   321 {

   322   if (!ShouldReportErrors()) return;

   324   nsAutoString innerStr;

   325   sStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),

   326                                    getter_Copies(innerStr));

   327   const char16_t *params[1] = { innerStr.get() };

   329   nsAutoString str;

   330   sStringBundle->FormatStringFromName(MOZ_UTF16("PEUnexpEOF2"),

   331                                       params, ArrayLength(params),

   332                                       getter_Copies(str));

   333   AddToError(str);

   334 }

   336 void

   337 ErrorReporter::ReportUnexpectedEOF(char16_t aExpected)

   338 {

   339   if (!ShouldReportErrors()) return;

   341   const char16_t expectedStr[] = {

   342     char16_t('\''), aExpected, char16_t('\''), char16_t(0)

   343   };

   344   const char16_t *params[1] = { expectedStr };

   346   nsAutoString str;

   347   sStringBundle->FormatStringFromName(MOZ_UTF16("PEUnexpEOF2"),

   348                                       params, ArrayLength(params),

   349                                       getter_Copies(str));

   350   AddToError(str);

   351 }

   353 } // namespace css

   354 } // namespace mozilla

   356 #endif

The Tor Browser / file revision

layout/style/ErrorReporter.cpp@97036ab72558

layout/style/ErrorReporter.cpp