perf probe: adding probe on C++ member/namespace function or versioned symbols

[Milian Wolff <milian.wolff@kdab.com>]

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Hey there,

how can one escape function names for `perf probe`? It seems like the current 
parser is confused by the `:` which is common in C++ symbol names.

```
$ perf probe -F --exec /usr/lib/libQt5Widgets.so | grep syncBacking
QWidgetPrivate::syncBackingStore
QWidgetPrivate::syncBackingStore

$ perf probe --exec /usr/lib/libQt5Widgets.so --add 
QWidgetPrivate::syncBackingStore
Semantic error :There is non-digit char in line number.
...
```

Additionally, it is also not possible to pass a versioned symbol either:
```
$ nm -aD /usr/lib/libQt5Widgets.so | grep syncBacking
0000000000197480 T 
_ZN14QWidgetPrivate16syncBackingStoreERK7QRegion@@Qt_5_PRIVATE_API
00000000001973b0 T _ZN14QWidgetPrivate16syncBackingStoreEv@@Qt_5_PRIVATE_API
Semantic error :SRC@SRC is not allowed.
...
```

Is there a workaround available for this?

Thanks

-- 
Milian Wolff | milian.wolff@kdab.com | Senior Software Engineer
KDAB (Deutschland) GmbH, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt, C++ and OpenGL Experts

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