[LLVMdev] Steps to addDestination

[Rasha Omar]

1- I need the first example.
2- I set the Address uninitialized according to the documentation
" Setting the name on the Value automatically updates the module's symbol
table"
from Value.h source code
3- I'm not sure about "select" instruction, you mean that the address is
the new destination (basic block)that will be added
Thanks


On 23 July 2013 16:38, Tim Northover <t.p.northover at gmail.com> wrote:

> Hi Rasha,
>
> > I need to addDestination to some basic blocks
>
> Just to make sure there's no confusion here: you really are trying to
> create code like:
>
> define i32 @foo(i1 %tst) {
>   %Address = select i1 %tst, i8* blockaddress(@foo, %true), i8*
> blockaddress(@foo, %false)
>   indirectbr i8* %Address, [label %true, label %false] ; This is what
> you're creating
> true:
>   ret i32 42
> false:
>   ret i32 0
> }
>
> and not:
>
> define i32 @bar(i1 %tst) {
>   br i1 %tst, label %true, label %false ; You're not trying to create this
> true:
>   ret i32 42
> false:
>   ret i32 0
> }
>
> If that's incorrect, you're going about it entirely the wrong way. We
> can help with either, but it's best not to go too far on a
> misunderstanding.
>
> >  Value* Address;
> >   IndirectBrInst *IBI = IndirectBrInst::Create(Address,
> Result.size(),i->getTerminator() );
> >
> > IBI->addDestination(i);
>
> The problem seems to be that "Address" is uninitialised but it needs
> to be set to some valid pointer value before creating your IndirectBr.
> To replicate my first example it would be set to the "select"
> instruction, for example; whatever produces your testination
> blockaddress.
>
> Cheers.
>
> Tim.
>



-- 
*Rasha Salah Omar
Msc Student at E-JUST
Demonestrator  at Faculty of Computers and Informatics
Benha University
*
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