[lldb-dev] Watching the current frame locals

[Eran Ifrah]

Thanks, will debug this and see where it fails

Eran


On Mon, Apr 7, 2014 at 1:43 AM, Enrico Granata <egranata at apple.com> wrote:

> Yeah the const char* definitely should have a value.
> I am guessing the variable is in scope all right. Does it have a summary
> if you ask for that?
> Does the same API call work if you stop directly within LLDB and use the
> Python API?
> More context (e.g. a repro case) would also help - or maybe if you can
> step through the LLDB code and see where we fail. If these are just frame
> locals I expect the relevant code to be in ValueObject.cpp GetValueAsCString
>
> Sent from the iPhone of
> *Enrico Granata* <egranata@🍎.com>
>
> On Apr 6, 2014, at 12:26 PM, Eran Ifrah <eran.ifrah at gmail.com> wrote:
>
> One of the local variables was 'const char*' so I would expect it to have
> a value and others were of type of 'wxString'
> In the UI I expanded all the way to the _M_data which is of type
> 'wchar_t*' - and still nothing
>
> Eran
>
>
>
> On Sun, Apr 6, 2014 at 9:13 PM, Enrico Granata <egranata at apple.com> wrote:
>
>> What is the data type of your variables?
>>
>> If they are aggregate types (structs, classes, ...) they won't have a
>> value.
>>
>> Only basic types (int, float, char, ..., you get the idea - and pointers)
>> have a value.
>>
>> For other types, they might have a summary, or they might have children,
>> but definitely no value.
>>
>> Sent from the iPhone of
>> *Enrico Granata* <egranata@🍎.com>
>>
>> On Apr 6, 2014, at 7:02 AM, Eran Ifrah <eran.ifrah at gmail.com> wrote:
>>
>> Hello all,
>>
>> I am at a phase where I want to display the current frame local variables
>> whenever the debugger "stops"
>> I was able to get a list of the selected frame's variables in the
>> following manner:
>>
>> lldb::SBFrame frame =
>> m_target.GetProcess().GetSelectedThread().GetSelectedFrame();
>> ...
>> lldb::SBValueList args = frame.GetBlock().GetVariables(m_target, true,
>> true, false);
>> for(size_t i=0; i<args.GetSize(); ++i) {
>>         lldb::SBValue value = args.GetValueAtIndex(i);
>>         if ( value.IsValid() ) {
>>             LLDBLocalVariable::Ptr_t var( new LLDBLocalVariable(value) );
>>             locals.push_back( var );
>>         }
>> }
>>
>> Now, LLDBLocalVariable is a thin wrapper class for UI purposes.
>> What it does is basically copies values from lldb::SBValue:
>>
>> LLDBLocalVariable::LLDBLocalVariable(lldb::SBValue value) {
>>     SetName( value.GetName() );
>>     SetType( value.GetTypeName() );
>>     SetValue( value.GetValue() ); // always returns null
>>     ... // code that handles children of value
>> }
>>
>> value.GetName() and value.GetTypeName() are working as expected (i.e. I
>> get the correct type name and its name)
>> However, I can't get the value as "string". I was naive enough to think
>> that const char* SBValue::GetValue() will do the trick... but this always
>> returns NULL.
>>
>> Any suggestions on what am I doing wrong? an example on how to extract
>> the variable's value in string format will be really appreciated
>>
>> Thanks,
>>
>> P.S.
>> This is Linux 13.10 / 64 bit
>> Self compiled lldb
>>
>> --
>> Eran Ifrah
>> Author of codelite, a cross platform open source C/C++ IDE:
>> http://www.codelite.org
>> wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org
>>
>> _______________________________________________
>> lldb-dev mailing list
>> lldb-dev at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>>
>>
>
>
> --
> Eran Ifrah
> Author of codelite, a cross platform open source C/C++ IDE:
> http://www.codelite.org
> wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org
>
>


-- 
Eran Ifrah
Author of codelite, a cross platform open source C/C++ IDE:
http://www.codelite.org
wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/lldb-dev/attachments/20140407/e2b1b237/attachment.html>