[lldb-dev] Structure variable names

Jiten Thakkar via lldb-dev lldb-dev at lists.llvm.org
Tue Jun 7 13:15:26 PDT 2016

Thanks Greg and Duane, I will try these things and comeback if I have further questions.

> On Jun 7, 2016, at 12:28 PM, duane at duaneellis.com wrote:
> You need to understand the DWARF (debug info)
> Try this:
> Create a *SIMPLE* C file - with a simple structure
> Do *not* "#include" any file - make your file 100% standalone.
> (later you can get more complicated, you want a simple translation unit)
> Do the following with both GCC and LLVM
> Compile this file using only the "-c -S"  options. (this produces an assembly listing)
> Next, add the "-g" option thus:  "-c -S -g" - look at the difference.
> Try other variants of the "-g" (see the man pages)
> Look over the .S file output - this should give you a good description of the dwarf info.
> Add things - this will get you started.  Then - start reading about DWARF records and and then start spelunking (cave exploring) through out the code base - both in LLVM and in GDB - compare and contrast.
> Find some function - in the bowels of GDB and/or LLVM and set a breakpoint - use GDB to DEBUG GDB 
> or LLVM to Debug LLVM what ever combination you like.
> A good example would be the "print variable" operation, then step through the code and examine the available variables and the dwarf debug data structures "in-situ" with actual data present.  Also disable the optimizer, and turn on all debugging. This means building your own version of GDB and/or LLVM 
> -Duane.
> -------- Original Message --------
> Subject: [lldb-dev] Structure variable names
> From: Jiten Thakkar via lldb-dev <lldb-dev at lists.llvm.org <mailto:lldb-dev at lists.llvm.org>>
> Date: Tue, June 07, 2016 9:56 am
> To: lldb-dev at lists.llvm.org <mailto:lldb-dev at lists.llvm.org>
> Hi All,
> I am working on a project as part of my graduate study which uses LLVM.
> I am new to LLVM and lldb to be particular.
> My goal is to get names of the parameters to functions. If the parameter is a variable in a structure, it is represented as an offset in the structure.
> I want to get the names of all those parameters. I assume that debug info should provide this but so far I am unable to find any documentation regarding which would describe how to do it. 
> Is there a way to do this using debug info? Is this even possible?
> Please let me know if any of this is confusing and I will try to describe it in detail.
> Thanks,
> Jiten
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