[LLVMdev] Graphviz and LLVM-TV

[Ioannis Nousias]

Thanks Tobi for the tip.

however I also need the Data-Flow-Graph of each basic block/functions. 
As I said, I need a view of how the instructions 'link' to each other 
(via registers or memory aliasing or whatnot)

thanks again and sorry for the ping-pong,
Ioannis



Tobias Grosser wrote:
> On Thu, 2009-08-13 at 17:17 +0100, Ioannis Nousias wrote:
>   
>> Chris Lattner wrote:
>>
>> On Aug 13, 2009, at 8:56 AM, Ioannis Nousias wrote:
>>
>>     
>>> Hi
>>>
>>> I'm trying to get a graphviz output (DOT) of a code I'm compiling. I
>>> want to see the DFG/CFG of the LLVM assembly, how the operations are
>>> chained together. The documentation mentions something about calling
>>> certain methods from within gdb, but isn't there some option when
>>> invoking the compiler (I've seen some -print-cfg and -dot-cfg options
>>> mentioned in some source files, but I can't find which tool supports 
>>> them)
>>>
>>> This should help:
>>> http://llvm.org/docs/ProgrammersManual.html#ViewGraph
>>>
>>>       
>> Hey Chris. Thanks for the prompt response.
>> That's what I was referring to before. If I'm getting this right, I 
>> should do a debug build of LLVM and the run it from gdb? So say, I run 
>> llvmc from gdb, pass on the code I want to compile and then what? Should 
>> I do a break point somewhere first, or wait for the program to finish 
>> and then call the methods?(which I don't think it would work). I'm 
>> confused. I was hoping for some CLI option or a separate tool that just 
>> parses in LLVM assembly and spits out DOT.
>>     
>
> The flags for dot output work as any other optimization or analysis
> pass. So you can specify them at any tool that allows to pass
> optimization flags.
> You can use e.g. the "opt" binary and run it on any code that is already
> in llvm intermediate code.
>
> Use:
>
> opt -dot-cfg file.bc
>
> Any other tool that passes the flags to opt should also work.
>
> Tobi
>
>
>
>
>