[lldb-dev] Formatter for std::shared_ptr<std::wstring>

[Nino Kettlitz]

Hi Alexander,

your string implementation looks very complicated.

Also the type of the string looks strange. I would expect that 
"std::wstring" is a typedef
for "std::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t>"

You are using "std::__1::wstring" and the real type also contains this 
"__1" stuff
"std::__1::basic_string<wchar_t, std::__1::char_traits<wchar_t>, 
std::__1::allocator<wchar_t>>"
and it is additionally wrapped by a std::pair or sth similar.

I've never seen this before. Maybe somebody else in the mailing list did?!

So the wstring.py data formater works only for std::wstring with a 
"_M_dataplus" and a "_M_p" member

Cheers,
Nino




Am 06.08.2012 19:47, schrieb Alexander Angriawan:
> I am using Mac OS X Version 10.7.4
> The following is the lldb output:
>
> *(lldb) **frame variable x*
>
> (std::__1::wstring) x = {
>
>   __r_ = {
>
> std::__1::__libcpp_compressed_pair_imp<std::__1::basic_string<wchar_t, 
> std::__1::char_traits<wchar_t>, std::__1::allocator<wchar_t> >::__rep, 
> std::__1::allocator<wchar_t> > = {
>
>       __first_ = {
>
>          = {
>
>           __l = {
>
>             __cap_ = 17
>
>             __size_ = 12
>
>             __data_ = 0x00000001001009c0
>
>           }
>
>           __s = {
>
>              = {
>
>               __size_ = '\x11'
>
>               _ = \x11\0\0\0
>
>             }
>
>             __data_ = {
>
>               [0] = \0\0\0\0
>
>               [1] = \f\0\0\0
>
>               [2] = \0\0\0\0
>
>               [3] = \xc0\t\x10\0
>
>               [4] = \x01\0\0\0
>
>             }
>
>           }
>
>           __r = {
>
>             __words = {
>
>               [0] = 17
>
>               [1] = 12
>
>               [2] = 4296018368
>
>             }
>
>           }
>
>         }
>
>       }
>
>     }
>
>   }
>
> }
>
> *(lldb) *
>
>
> Thanks,
> PA
>
> ------------------------------------------------------------------------
> Date: Mon, 6 Aug 2012 11:24:48 +0200
> From: nino.kettlitz at googlemail.com
> To: angriawan at hotmail.com
> Subject: Re: [lldb-dev] Formatter for std::shared_ptr<std::wstring>
>
> Hmm, thats strange.
>
> I'm currently using not the latest lldb, so maybe something changed.
>
> What platform are you developing on? The script is written for osx.
>
> Maybe you can just send me the output of "frame variable x" without 
> having the script installed. Maybe the structure of your strings differ.
>
>
> N.
>
> Am 06.08.12 10:54, schrieb Alexander Angriawan:
>
>     Thank you Nino.
>
>     Unfortunately the script doesn't work in my environment.
>     GetByteSize() always return 0 in my case.
>
>     ....
>                if _M_p_data.GetByteSize() == 1:
>                     _M_p_deref = _M_p_data.GetUnsignedInt8(e, 0)    #
>     utf-8
>                 elif _M_p_data.GetByteSize() == 2:
>                     _M_p_deref = _M_p_data.GetUnsignedInt16(e, 0)   #
>     utf-16
>                 elif _M_p_data.GetByteSize() == 4:
>                     _M_p_deref = _M_p_data.GetSignedInt32(e, 0)     #
>     utf-32
>                 else:
>      _M_p_deref = -1
>                 if _M_p_deref <= 0:
>     break
>     ----
>
>     My simple test code:
>
>     int main(int argc, const char * argv[])
>
>     {
>
>     std::wstringx = L"fooo";
>
>     return0;
>
>     }
>
>
>     ---
>     JA
>
>
>
>
>
>     ------------------------------------------------------------------------
>     Date: Mon, 6 Aug 2012 09:54:09 +0200
>     From: nino.kettlitz at googlemail.com
>     <mailto:nino.kettlitz at googlemail.com>
>     To: angriawan at hotmail.com <mailto:angriawan at hotmail.com>
>     CC: lldb-dev at cs.uiuc.edu <mailto:lldb-dev at cs.uiuc.edu>
>     Subject: Re: [lldb-dev] Formatter for std::shared_ptr<std::wstring>
>
>     Oh,
>
>     I've seen, that the script attached to the mail is not on the
>     server, so I attached it again, although it would be better to
>     have it in the lldb svn.
>
>     Yust copy the script to your hom directory and ad the folowing
>     line to your .lldbinit
>
>     script sys.path[:0] = [os.path.expanduser('~')]
>     command alias pwd script print os.getcwd()
>     script import wstring
>     type summary add --python-function wstring.wstring_summary
>     "std::wstring"
>     type summary add --python-function wstring.wstring_summary
>     "std::basic_string<int, class std::char_traits<int>, class
>     std::allocator<int> >"
>     type summary add --python-function wstring.wstring_summary
>     "std::basic_string<unsigned short, class std::char_traits<unsigned
>     short>, class std::allocator<unsigned short> >"
>     type summary add --python-function wstring.wstring_summary
>     "std::basic_string<wchar_t, class std::char_traits<wchar_t>, class
>     std::allocator<wchar_t> >"
>
>
>     Cheers, Nino
>
>     Am 06.08.12 09:19, schrieb Alexander Angriawan:
>
>         Hello,
>
>         I am looking to write data formatter for
>         std::shared_ptr<std::wstring>.
>
>         I found the following old article but this doesn't seem to work.
>         I have ver 159 installed.
>         http://lists.cs.uiuc.edu/pipermail/lldb-dev/2012-February/000825.html
>
>
>         Any idea?
>
>         Thank you much,
>         PA
>
>
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>
>
>

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