Re: [tcf-dev] Find Symbol by Name, Address, Scope

[<Stefan.Falk@xxxxxxxxxxxx>]

Hi Xavier, hi Christophe and thanks for answering!

I am using the SDCC (http://sdcc.sourceforge.net/) to compile for the i8051. It produces a CDB file (http://sdcc.sourceforge.net/mediawiki/index.php/CDB_File_Format) which I already parsed and extracted all debug information so far.

I am integrating a full CDB parser interface and an interface to a proprietary debugger for the agent. 

Right now I am not able to retrieve information about the stack frame. At the moment is all that could potentially work is getting values from variables which are either stored inside RAM or registers. So stack is not supported yet.

Hope that makes sense to you. If you need more information about what I am doing feel free to ask!

Thank you!

--
Stefan Falk

Infineon Technologies Austria AG
Trainee
Automotive Sense and Control
Component Verification

Tel:  +43 (0)5 / 1777 - 5439
Email: stefan.falk@xxxxxxxxxxxx

"Aim above the mark to hit the mark." - Ralph Waldo Emerson

-----Original Message-----
From: tcf-dev-bounces@xxxxxxxxxxx [mailto:tcf-dev-bounces@xxxxxxxxxxx] On Behalf Of Xavier Pouyollon
Sent: Friday, June 13, 2014 3:11 PM
To: TCF Development
Subject: Re: [tcf-dev] Find Symbol by Name, Address, Scope

Hi Stefan,

What compiler are you using for your 8051 ?
Does this compiler generates dwarf debug informations ?
To know that, try objdump -h or readelf on the generated file.

If you can have a compiler for your 8051 that generates Dwarf 
information, nearly all the job is done because TCF handles Dwarf debug 
information format.

 > I don't really understand either how a name should be enough since 
there could be thousands of "int i;" declarations spread over a program. 
With no further information (like scope or PC location) this task seems 
impossible to me.

Download a Dwarf specification : http://www.dwarfstd.org/doc/Dwarf3.pdf
You'll see the debug_infos is a kind of tree defining variables, 
function, scopes and will provide rules on how to compute a variable 
location, variable type.

If your compiler does not generate dwarf information, it should generate 
similar datas.
Either you adapt the TCF code for these proprietatry datas or you write 
a converter that will generate Dwarf informations.

Hope it helps,
Best Regards,
Xavier.

On 06/13/2014 02:24 PM, Stefan.Falk@xxxxxxxxxxxx wrote:
> Hi folks!
>
> Since setting breakpoints and displaying register contents are already working, the next step would be to load and display the values of symbols/variables.
>
> I see - from symbols_win32.c - that there are several functions that are dedicated to that task. I was now wondering what the best way would be to implement that for my i8051.
>
> What I already have is a complete information structure of my program containing details like
>
> -       Modules, holding
> o       Global variables
> o       Functions
> -       Functions, holding
> o       Start, end address
> o       Local variables
> -       Variables, holding
> o       Location address (RAM, Register)
> o       Scope information (in C code)
> -       Memory Areas, holding
> o       Modules (for faster program counter mapping)
>
> So all that is missing is to integrate that into the agent.
>
> What would the best way to do that? As I have e.g. the exact scope information of a variable it would be fastest and easiest if Eclipse would sent me file:line:scope. I debugged it and what I saw was that either find_by_name or find_by_address was called.
>
> Is find_by_address only called if find_by_name didn't succeed?
> I don't really understand either how a name should be enough since there could be thousands of "int i;" declarations spread over a program. With no further information (like scope or PC location) this task seems impossible to me.
>
> So is there a way to get more information from Eclipse like the scope of the symbol?
>
> Thanks and best regards!
>
> --
> Stefan Falk
>
> Infineon Technologies Austria AG
> Trainee
> Automotive Sense and Control
> Component Verification
>
> Tel:  +43 (0)5 / 1777 - 5439
> Email: stefan.falk@xxxxxxxxxxxx<mailto:stefan.falk@xxxxxxxxxxxx>
>
> "Aim above the mark to hit the mark." - Ralph Waldo Emerson
>
>
>
> _______________________________________________
> tcf-dev mailing list
> tcf-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/tcf-dev

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