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QLogging: call a non-exported message-formatting function

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Instead of the exported qFormatLogMessage() that users can use. Because
it's a local symbol (static function), neither dladdr() nor
backtrace_symbols() functions should be able to see them, making their
exclusion from the list a simpler check.

This doesn't apply when the user calls qFormatLogMessage() in their own
handler, unless the compiler either inlines or tail-calls the new,
internal function. The latter case is very likely.

Change-Id: Ifa1111900d6945ea8e05fffd177e187f55512725
Reviewed-by: Kai Köhne <kai.koehne@qt.io>
This commit is contained in:
Thiago Macieira 2023-08-23 12:04:05 -07:00
parent 232f4f14be
commit 36805fc3c4
1 changed files with 14 additions and 5 deletions
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19
src/corelib/global/qlogging.cpp
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@ -170,6 +170,7 @@ static void qt_message_fatal(QtMsgType, const QMessageLogContext &context, Strin
static void qt_message_print(QtMsgType, const QMessageLogContext &context, const QString &message);
static void preformattedMessageHandler(QtMsgType type, const QMessageLogContext &context,
const QString &formattedMessage);
static QString formatLogMessage(QtMsgType type, const QMessageLogContext &context, const QString &str);
static int checked_var_value(const char *varname)
{
@ -1349,10 +1350,10 @@ void QMessagePattern::setPattern(const QString &pattern)
A typical backtrace in debug mode looks like:
#0 backtraceFramesForLogMessage (frameCount=0) at qlogging.cpp:1398
#1 formatBacktraceForLogMessage (backtraceParams=..., function=0x5555555580b0 "virtual void MyClass::myFunction(int)") at qlogging.cpp:1525
#2 qFormatLogMessage (type=QtDebugMsg, context=..., str=...) at qlogging.cpp:1637
#3 qDefaultMessageHandler (type=QtDebugMsg, context=..., message=...) at qlogging.cpp:1992
#4 qt_message_print (msgType=QtDebugMsg, context=..., message=...) at qlogging.cpp:2038
#5 qt_message_output (msgType=QtDebugMsg, context=..., message=...) at qlogging.cpp:2077
#2 formatLogMessage (type=QtDebugMsg, context=..., str=...) at qlogging.cpp:1642
#3 qDefaultMessageHandler (type=QtDebugMsg, context=..., message=...) at qlogging.cpp:1997
#4 qt_message_print (msgType=QtDebugMsg, context=..., message=...) at qlogging.cpp:2043
#5 qt_message_output (msgType=QtDebugMsg, context=..., message=...) at qlogging.cpp:2082
#6 QDebug::~QDebug (this=0x7fffffffd9b8, __in_chrg=<optimized out>) at qdebug.cpp:166
*/
static constexpr int TypicalBacktraceFrameCount = 7;
@ -1524,6 +1525,14 @@ Q_GLOBAL_STATIC(QMessagePattern, qMessagePattern)
\sa qInstallMessageHandler(), qSetMessagePattern()
*/
QString qFormatLogMessage(QtMsgType type, const QMessageLogContext &context, const QString &str)
{
return formatLogMessage(type, context, str);
}
// Separate function so the default message handler can bypass the public,
// exported function above. Static functions can't get added to the dynamic
// symbol tables, so they never show up in backtrace_symbols() or equivalent.
static QString formatLogMessage(QtMsgType type, const QMessageLogContext &context, const QString &str)
{
QString message;
@ -1961,7 +1970,7 @@ static void qDefaultMessageHandler(QtMsgType type, const QMessageLogContext &con
return;
}
preformattedMessageHandler(type, context, qFormatLogMessage(type, context, message));
preformattedMessageHandler(type, context, formatLogMessage(type, context, message));
}
#if defined(Q_COMPILER_THREAD_LOCAL)