[Qt-creator] QtCreator debug shows anonymous union for QVector, QSet, QList , etc

[André Pönitz]

On Wednesday 23 March 2011 13:27:06 ext Alex Reche wrote:
> Hi!
> 
> 
> I'm building an application using QtCreator and until recently, I was able to normally debug the application and inspect the values of the local variables.
> Recently I've installed QtCreator 2.1, Qt 4.7.2 and XCode4.
> 
> It seems that something went wrong because now I cannot see the values of my variables anymore.
> To be more specific, the containers QVector, QList, QSet, etc... are displayed as an anonymous union and then I can see the internal structure of those.
> dNOTE: INFERIOR SPONTANEOUES STOP
> dState changed from InferiorRunOk(10) to InferiorStopOk(13).
> <20call (void)dlopen("/Applications/Qt Creator.app/Contents/qtc-debugging-helper/92501879/libgdbmacros.dylib", 2)
> <21call (void*)qDumpObjectData440(1,0,0,0,0,0,0,0)
> <22p (char*)&qDumpOutBuffer
> <23p 4
> >&"call (void)dlopen(\"/Applications/Qt Creator.app/Contents/qtc-debugging-helper/92501879/libgdbmacros.dylib\", 2)\n"
> >20^done
> >&"call (void*)qDumpObjectData440(1,0,0,0,0,0,0,0)\n"
> >&"p (char*)&qDumpOutBuffer\n"
> >&"p 4\n"
> >~"$1 = 4"
> >~"\n"
> >23^done

Something goes wrong here. There is no response for commands 21 and 22.

As this is supposed to produce the list of "dumpable types" Creator ends up
believing that there is no dumper for any type available and falls back to
"plain C structure display".

> ----------------------- Using the gdb version that comes with XCode3 -------------------
> [....]
> <21call (void*)qDumpObjectData440(1,0,0,0,0,0,0,0)
> <22p (char*)&qDumpOutBuffer
> <23p 4
> >&"call (void)dlopen(\"/Applications/Qt Creator.app/Contents/qtc-debugging-helper/92501879/libgdbmacros.dylib\", 2)\n"
> >20^done
> >&"call (void*)qDumpObjectData440(1,0,0,0,0,0,0,0)\n"
> >&"p (char*)&qDumpOutBuffer\n"
> >&"p 4\n"
> >~"$1 = 4"
> >~"\n"
> >23^done

Same here.

A "good" log looks like:

 295: <24call (void)dlopen("/Volumes/Data/Users/.../qtc-debugging-helper/libgdbmacros.dylib", 2)
 296: <25call (void*)qDumpObjectData440(1,0,0,0,0,0,0,0)
 297: <26p (char*)&qDumpOutBuffer
 298: <27p 4
 299: >&"call (void)dlopen(\"/Volumes/Data/Users/.../qtc-debugging-helper/libgdbmacros.dylib\", 2)\n"
 300: >=shlibs-added,shlib-info={num="108",name="libgdbmacros.1.0.0.dylib",kind="-",dyld-addr="0x1153f7000",reason="dyld",requested-state="Y",state="Y",path="/Volumes/Data/Users/.../qtc-debugging-helper/libgdbmacros.1.0.0.dylib",description="/Volumes/Data/.../qtc-debugging-helper/libgdbmacros.1.0.0.dylib",loaded_addr="0x1153f7000",slide="0x1153f7000",prefix=""},time={now="1300886290.777835"}
 301: >24^done
 302: >&"call (void*)qDumpObjectData440(1,0,0,0,0,0,0,0)\n"
 303: >~"$1 = (void *) 0x115418260\n"
 304: >25^done
 305: >&"p (char*)&qDumpOutBuffer\n"
 306: >~"$2 = 0x115418260 \"tdumpers=[\\\"QAbstractItem\\\",\\\"QAbstractItemModel\\\",\\\"QByteArray\\\",\\\"QChar\\\",\\\"QDate\\\",\\\"QDateTime\\\",\\\"QDir\\\",\\\"QFile\\\",\\\"QFileInfo\\\",\\\"QHash\\\",\\\"QHashNode\\\",\\\"QImage\\\",\\\"QLinkedList\\\",\\\"QList\\\",\\\"QLocale\\\",\\\"QMap\\\",\\\"QMapNode\\\",\\\"QModelIndex\\\",\\\"QObject\\\",\\\"QObjectMethodList\\\",\\\"QObjectProperty\\\",\\\"QObjectPropertyList\\\",\\\"QObjectSignal\\\",\\\"QObjectSignalList\\\",\\\"QObjectSlot\\\",\\\"QObjectSlotList\\\",\\\"QObjectChildList\\\",\\\"QPoint\\\",\\\"QPointF\\\",\\\"QRect\\\",\\\"QRectF\\\",\\\"QSet\\\",\\\"QSize\\\",\\\"QSizeF\\\",\\\"QStack\\\",\\\"QString\\\",\\\"QStringList\\\",\\\"QTextCodec\\\",\\\"QTime\\\",\\\"QVariant\\\",\\\"QVariantList\\\",\\\"QVector\\\",\\\"QMultiMap\\\",\\\"QSharedPointer\\\",\\\"QWeakPointer\\\",\\\"QPixmap\\\",\\\"QWidget\\\",\\\"string\\\",\\\"wstring\\\",\\\"std::basic_string\\\",\\\"std::list\\\",\\\"std::map\\\",\\\"std::set\\\",\\\"std::string\\\",\\\"std::vector\\\",\\\"std::wstring\\\",],qtversion=[\\\"4\\\",\\\"7\\\",\\\"4\\\"],namespace=\\\"\\\",dumperversion=\\\"1.3\\\",\""
 307: >~"\n"
 308: >26^done
 309: sDumper version 1.3, 56 custom dumpers found.

Note the responses to commands 25 and 26.

Could you try to enter command like  "p (char*)&qDumpOutBuffer"
or "p qDumpOutBuffer" "manually" in the input pane (left hand side,
send with Ctrl-<Return>), or take the contents of the input pane
and paste it into a gdb started from the command line?

Andre'