[lldb-dev] PTYPE replacement in LLDB

[Greg Clayton via lldb-dev]

> On Sep 11, 2017, at 10:10 PM, vignesh balu via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> 
> Hi All,
> 
> I see in the command Mapping Documnet, we can use "image lookup -type" in place of "ptype" from gdb. Currently, this can be used only for Type(link int, char) , or gloal, static variable or function symbol.

Another option is:

(lldb) type lookup
> 
> This is not as efficient as GDB, where it  will whole structure if we point to variable.
> Here we have to find the variable type first and then we have to do "image lookup".
> 
> do we have a single command which will do that ?

Not at the moment. 

> If not, shall we implement one or integrating with one of existing command is good ?

The question is where does it belong? We could add it in one of two places as far as I see:

(lldb) frame variable --type my_var [my_var2]

The "--type" option (no arguments for the option) would indicate we want to dump the types of any variable names listed as arguments to the command.

(lldb) type lookup --variable my_var --variable my_var2

where "--variable <VARNAME>" means to look at the type of a variable.

I think both would be useful as they would be easy to add.

Please let me know if anyone has any other ideas.

BTW: it would be easy to add this as a python command for now until we get this into lldb.

> 
> thanks,
> vigneshbalu
> 
> 
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