llvm dev - Apr 2013 - [LLVMdev] CallGraph

Hello,

I try to make a big CFG (control flow graph) by combining all the CFG-s
from all the functions of a module. I still have one problem : I want to
get the links between functions.

For CFG-s, I used CallGraphNode->second->getFunction, then
Function_iterators and succ_iterators, so I have all the links between BBs.
Now, the questions is how do I link BBs from different functions?

I can do it in a way not so elegant. Take the last BB of every function,
then getTerminator and see that function it is called and then link to
(instruction-2-instruction).

There must be there a better way to get the linkage between BBs that are in
different functions.

Thank you for any help !
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Hi,

On 26/04/13 11:19, Alexandru Ionut Diaconescu wrote:
> Hello,
>
> I try to make a big CFG (control flow graph) by combining all the CFG-s
from all
> the functions of a module. I still have one problem : I want to get the
links
> between functions.
>
> For CFG-s, I used CallGraphNode->second->getFunction, then
Function_iterators
> and succ_iterators, so I have all the links between BBs. Now, the questions
is
> how do I link BBs from different functions?
>
> I can do it in a way not so elegant. Take the last BB of every function,
then
> getTerminator and see that function it is called and then link to
> (instruction-2-instruction).
calls don't have to be terminators, so that wouldn't work properly
anyway.
>
> There must be there a better way to get the linkage between BBs that are in
> different functions.
Sure, take a look at include/llvm/Analysis/CallGraph.h

Ciao, Duncan.

Thanks for the response.
I looked and I cannot see what exactly I need. I saw getCalledFunction() so
I need CallSite CS(cast<Value>(II)) where II is a basic block iterator, so
an instruction. It seems not easier than the "unelegant" version....if
I am
still at the Instruction level...

I need a method that takes from a "leaf" basic block from a function
(Maybe
there is the possibility not to have only one "end" basic block) the
connection with an entry basic block of another function.

Thank you !



On Fri, Apr 26, 2013 at 1:04 PM, Duncan Sands <baldrick at free.fr> wrote:
> Hi,
>
>
> On 26/04/13 11:19, Alexandru Ionut Diaconescu wrote:
>
>> Hello,
>>
>> I try to make a big CFG (control flow graph) by combining all the CFG-s
>> from all
>> the functions of a module. I still have one problem : I want to get the
>> links
>> between functions.
>>
>> For CFG-s, I used CallGraphNode->second->**getFunction, then
>> Function_iterators
>> and succ_iterators, so I have all the links between BBs. Now, the
>> questions is
>> how do I link BBs from different functions?
>>
>> I can do it in a way not so elegant. Take the last BB of every
function,
>> then
>> getTerminator and see that function it is called and then link to
>> (instruction-2-instruction).
>>
>
> calls don't have to be terminators, so that wouldn't work properly
anyway.
>
>
>
>> There must be there a better way to get the linkage between BBs that
are
>> in
>> different functions.
>>
>
> Sure, take a look at include/llvm/Analysis/**CallGraph.h
>
> Ciao, Duncan.
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>


-- 
Best regards,
Alexandru Ionut Diaconescu
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