GDB Printers Use string instead of char array

[Da Viper]

Hello there,

Fixed the problem, I accessed the values directly from memory, you could
check it now.

On Thu, 29 Jul 2021, 13:22 Da Viper, <yerimyah1 at gmail.com> wrote:

> would update it
>
> Hello what os and architecture was it built on that it gets optimised out
> ?
>
>
> How do you check that the position is in 1 instead of 2 in  i586
> architecture
>
>
>
>
> On Thu, 29 Jul 2021, 12:22 Ralf Habacker via Kde-finance-apps, <
> kde-finance-apps at kde.org> wrote:
>
>> Am 29.07.21 um 12:49 schrieb Ralf Habacker via Kde-finance-apps:
>> > Am 28.07.21 um 15:48 schrieb Da Viper via Kde-finance-apps:
>> >> i am trying to return a string as one of the children in the pretty
>> printer
>> >>
>> Compiling a test case for QStringRef having
>>
>>
>>    QString a("test)
>>    QStringRef aRef(&a);
>>
>>
>> with RelWidhDebInfo cmake build type on running gdb 10.1 with your qt
>> printers enabled I get the following error:
>>
>> Traceback (most recent call last):
>>   File "/usr/share/gdb/python/gdb/printing.py", line 218, in __call__
>>     return printer.gen_printer(val)
>>   File "/home/ralf.habacker/src/gdb_printers/printers/qtprinters.py",
>> line 301, in __init__
>>     self.index = int(val['m_position'])
>> gdb.error: value has been optimized out
>>
>>
>> According to
>> https://github.com/qt/qtbase/blob/5.15/src/corelib/text/qstring.h#L1602
>> QStringRef is defined as
>>
>> class Q_CORE_EXPORT QStringRef {
>>     const QString *m_string;
>>     int m_position;
>>     int m_size;
>>
>>
>> m_position is be accessable by using
>>
>> (gdb) p ((int*)&aRef)[2]
>> $3 = 0
>>
>> when the target has been compiled for x86_64 architecture and by
>>
>> (gdb) p ((int*)&aRef)[1]
>> $3 = 0
>>
>> with i586 architecture.
>>
>>
>> Accessing the referenced string can be done with
>>
>> (gdb) p *(QString**)&aRef
>> $3 = (QString *) 0x7fffffffd6e8
>>
>> and the content returned by
>>
>> (gdb) p **(QString**)&bRef
>> $4 = "test"
>>
>> Regards
>> Ralf
>>
>
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