gecko-dev/layout/style/ErrorReporter.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* diagnostic reporting for CSS style sheet parser */
#include "mozilla/css/ErrorReporter.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/css/Loader.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "mozilla/SystemGroup.h"
#include "nsCSSScanner.h"
#include "nsIConsoleService.h"
#include "nsIDocument.h"
#include "nsIFactory.h"
#include "nsIScriptError.h"
#include "nsISensitiveInfoHiddenURI.h"
#include "nsIStringBundle.h"
#include "nsServiceManagerUtils.h"
#include "nsStyleUtil.h"
#include "nsThreadUtils.h"
#include "nsNetUtil.h"
#ifdef CSS_REPORT_PARSE_ERRORS
using namespace mozilla;
namespace {
class ShortTermURISpecCache : public Runnable {
public:
ShortTermURISpecCache()
: Runnable("ShortTermURISpecCache")
, mPending(false) {}
nsString const& GetSpec(nsIURI* aURI) {
if (mURI != aURI) {
mURI = aURI;
if (NS_FAILED(NS_GetSanitizedURIStringFromURI(mURI, mSpec))) {
mSpec.AssignLiteral("[nsIURI::GetSpec failed]");
}
}
return mSpec;
}
bool IsInUse() const { return mURI != nullptr; }
bool IsPending() const { return mPending; }
void SetPending() { mPending = true; }
// When invoked as a runnable, zap the cache.
NS_IMETHOD Run() override {
mURI = nullptr;
mSpec.Truncate();
mPending = false;
return NS_OK;
}
private:
nsCOMPtr<nsIURI> mURI;
nsString mSpec;
bool mPending;
};
} // namespace
static bool sReportErrors;
static nsIConsoleService *sConsoleService;
static nsIFactory *sScriptErrorFactory;
static nsIStringBundle *sStringBundle;
static ShortTermURISpecCache *sSpecCache;
#define CSS_ERRORS_PREF "layout.css.report_errors"
static bool
InitGlobals()
{
MOZ_ASSERT(!sConsoleService && !sScriptErrorFactory && !sStringBundle,
"should not have been called");
if (NS_FAILED(Preferences::AddBoolVarCache(&sReportErrors, CSS_ERRORS_PREF,
true))) {
return false;
}
nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (!cs) {
return false;
}
nsCOMPtr<nsIFactory> sf = do_GetClassObject(NS_SCRIPTERROR_CONTRACTID);
if (!sf) {
return false;
}
nsCOMPtr<nsIStringBundleService> sbs = services::GetStringBundleService();
if (!sbs) {
return false;
}
nsCOMPtr<nsIStringBundle> sb;
nsresult rv = sbs->CreateBundle("chrome://global/locale/css.properties",
getter_AddRefs(sb));
if (NS_FAILED(rv) || !sb) {
return false;
}
cs.forget(&sConsoleService);
sf.forget(&sScriptErrorFactory);
sb.forget(&sStringBundle);
return true;
}
static inline bool
ShouldReportErrors()
{
if (!sConsoleService) {
if (!InitGlobals()) {
return false;
}
}
return sReportErrors;
}
namespace mozilla {
namespace css {
/* static */ void
ErrorReporter::ReleaseGlobals()
{
NS_IF_RELEASE(sConsoleService);
NS_IF_RELEASE(sScriptErrorFactory);
NS_IF_RELEASE(sStringBundle);
NS_IF_RELEASE(sSpecCache);
}
ErrorReporter::ErrorReporter(const nsCSSScanner& aScanner,
const StyleSheet* aSheet,
const Loader* aLoader,
nsIURI* aURI)
: mScanner(&aScanner), mSheet(aSheet), mLoader(aLoader), mURI(aURI),
mInnerWindowID(0), mErrorLineNumber(0), mPrevErrorLineNumber(0),
mErrorColNumber(0)
{
}
ErrorReporter::ErrorReporter(const ServoStyleSheet* aSheet,
const Loader* aLoader,
nsIURI* aURI)
: mScanner(nullptr), mSheet(aSheet), mLoader(aLoader), mURI(aURI),
mInnerWindowID(0), mErrorLineNumber(0), mPrevErrorLineNumber(0),
mErrorColNumber(0)
{
}
ErrorReporter::~ErrorReporter()
{
// Schedule deferred cleanup for cached data. We want to strike a
// balance between performance and memory usage, so we only allow
// short-term caching.
if (sSpecCache && sSpecCache->IsInUse() && !sSpecCache->IsPending()) {
nsCOMPtr<nsIRunnable> runnable(sSpecCache);
nsresult rv =
SystemGroup::Dispatch(TaskCategory::Other, runnable.forget());
if (NS_FAILED(rv)) {
// Peform the "deferred" cleanup immediately if the dispatch fails.
sSpecCache->Run();
} else {
sSpecCache->SetPending();
}
}
}
void
ErrorReporter::OutputError()
{
if (mError.IsEmpty()) {
return;
}
if (!ShouldReportErrors()) {
ClearError();
return;
}
if (mInnerWindowID == 0 && (mSheet || mLoader)) {
if (mSheet) {
mInnerWindowID = mSheet->FindOwningWindowInnerID();
}
if (mInnerWindowID == 0 && mLoader) {
nsIDocument* doc = mLoader->GetDocument();
if (doc) {
mInnerWindowID = doc->InnerWindowID();
}
}
// don't attempt this again, even if we failed
mSheet = nullptr;
mLoader = nullptr;
}
if (mFileName.IsEmpty()) {
if (mURI) {
if (!sSpecCache) {
sSpecCache = new ShortTermURISpecCache;
NS_ADDREF(sSpecCache);
}
mFileName = sSpecCache->GetSpec(mURI);
mURI = nullptr;
} else {
mFileName.AssignLiteral("from DOM");
}
}
nsresult rv;
nsCOMPtr<nsIScriptError> errorObject =
do_CreateInstance(sScriptErrorFactory, &rv);
if (NS_SUCCEEDED(rv)) {
// It is safe to used InitWithSanitizedSource because mFileName is
// an already anonymized uri spec.
rv = errorObject->InitWithSanitizedSource(mError,
mFileName,
mErrorLine,
mErrorLineNumber,
mErrorColNumber,
nsIScriptError::warningFlag,
"CSS Parser",
mInnerWindowID);
if (NS_SUCCEEDED(rv)) {
sConsoleService->LogMessage(errorObject);
}
}
ClearError();
}
void
ErrorReporter::OutputError(uint32_t aLineNumber, uint32_t aColNumber)
{
mErrorLineNumber = aLineNumber;
mErrorColNumber = aColNumber;
OutputError();
}
// When Stylo's CSS parser is in use, this reporter does not have access to the CSS parser's
// state. The users of ErrorReporter need to provide:
// - the line number of the error
// - the column number of the error
// - the complete source line containing the invalid CSS
void
ErrorReporter::OutputError(uint32_t aLineNumber,
uint32_t aColNumber,
const nsACString& aSourceLine)
{
mErrorLineNumber = aLineNumber;
mErrorColNumber = aColNumber;
// Retrieve the error line once per line, and reuse the same nsString
// for all errors on that line. That causes the text of the line to
// be shared among all the nsIScriptError objects.
if (mErrorLine.IsEmpty() || mErrorLineNumber != mPrevErrorLineNumber) {
mErrorLine.Truncate();
// This could be a really long string for minified CSS; just leave it empty if we OOM.
if (!AppendUTF8toUTF16(aSourceLine, mErrorLine, fallible)) {
mErrorLine.Truncate();
}
mPrevErrorLineNumber = aLineNumber;
}
OutputError();
}
void
ErrorReporter::ClearError()
{
mError.Truncate();
}
void
ErrorReporter::AddToError(const nsString &aErrorText)
{
if (!ShouldReportErrors()) return;
if (mError.IsEmpty()) {
mError = aErrorText;
// If this error reporter is being used from Stylo, the equivalent operation occurs
// in the OutputError variant that provides source information.
if (!IsServo()) {
mErrorLineNumber = mScanner->GetLineNumber();
mErrorColNumber = mScanner->GetColumnNumber();
// Retrieve the error line once per line, and reuse the same nsString
// for all errors on that line. That causes the text of the line to
// be shared among all the nsIScriptError objects.
if (mErrorLine.IsEmpty() || mErrorLineNumber != mPrevErrorLineNumber) {
// Be careful here: the error line might be really long and OOM
// when we try to make a copy here. If so, just leave it empty.
if (!mErrorLine.Assign(mScanner->GetCurrentLine(), fallible)) {
mErrorLine.Truncate();
}
mPrevErrorLineNumber = mErrorLineNumber;
}
}
} else {
mError.AppendLiteral(" ");
mError.Append(aErrorText);
}
}
void
ErrorReporter::ReportUnexpected(const char *aMessage)
{
if (!ShouldReportErrors()) return;
nsAutoString str;
sStringBundle->GetStringFromName(aMessage, str);
AddToError(str);
}
void
ErrorReporter::ReportUnexpected(const char *aMessage,
const nsString &aParam)
{
if (!ShouldReportErrors()) return;
nsAutoString qparam;
nsStyleUtil::AppendEscapedCSSIdent(aParam, qparam);
const char16_t *params[1] = { qparam.get() };
nsAutoString str;
sStringBundle->FormatStringFromName(aMessage, params, ArrayLength(params),
str);
AddToError(str);
}
void
ErrorReporter::ReportUnexpectedUnescaped(const char *aMessage,
const nsAutoString& aParam)
{
if (!ShouldReportErrors()) return;
const char16_t *params[1] = { aParam.get() };
nsAutoString str;
sStringBundle->FormatStringFromName(aMessage, params, ArrayLength(params),
str);
AddToError(str);
}
void
ErrorReporter::ReportUnexpected(const char *aMessage,
const nsCSSToken &aToken)
{
if (!ShouldReportErrors()) return;
nsAutoString tokenString;
aToken.AppendToString(tokenString);
ReportUnexpectedUnescaped(aMessage, tokenString);
}
void
ErrorReporter::ReportUnexpected(const char *aMessage,
const nsCSSToken &aToken,
char16_t aChar)
{
if (!ShouldReportErrors()) return;
nsAutoString tokenString;
aToken.AppendToString(tokenString);
const char16_t charStr[2] = { aChar, 0 };
const char16_t *params[2] = { tokenString.get(), charStr };
nsAutoString str;
sStringBundle->FormatStringFromName(aMessage, params, ArrayLength(params),
str);
AddToError(str);
}
void
ErrorReporter::ReportUnexpected(const char *aMessage,
const nsString &aParam,
const nsString &aValue)
{
if (!ShouldReportErrors()) return;
nsAutoString qparam;
nsStyleUtil::AppendEscapedCSSIdent(aParam, qparam);
const char16_t *params[2] = { qparam.get(), aValue.get() };
nsAutoString str;
sStringBundle->FormatStringFromName(aMessage, params, ArrayLength(params),
str);
AddToError(str);
}
void
ErrorReporter::ReportUnexpectedEOF(const char *aMessage)
{
if (!ShouldReportErrors()) return;
nsAutoString innerStr;
sStringBundle->GetStringFromName(aMessage, innerStr);
const char16_t *params[1] = { innerStr.get() };
nsAutoString str;
sStringBundle->FormatStringFromName("PEUnexpEOF2", params,
ArrayLength(params), str);
AddToError(str);
}
void
ErrorReporter::ReportUnexpectedEOF(char16_t aExpected)
{
if (!ShouldReportErrors()) return;
const char16_t expectedStr[] = {
char16_t('\''), aExpected, char16_t('\''), char16_t(0)
};
const char16_t *params[1] = { expectedStr };
nsAutoString str;
sStringBundle->FormatStringFromName("PEUnexpEOF2", params,
ArrayLength(params), str);
AddToError(str);
}
bool
ErrorReporter::IsServo() const
{
return !mScanner;
}
} // namespace css
} // namespace mozilla
#endif