[LLVMdev] llvm get Value* iterators

[Justin Holewinski]

If I1->getOperand(0) is the load, then %c is its pointer argument available
with:

LoadInst *LD = cast<LoadInst>(I1->getOperand(0));
Value *C = LD->getPointerOperand();



On Fri, Jan 11, 2013 at 7:19 AM, Alexandru Ionut Diaconescu <
alexandruionutdiaconescu at gmail.com> wrote:

> Hello everyone !
>
> In my LLVM pass, there is `Intruction* I1`. All the used "I1"s are ICMP
> instructions. *I1->getOperand(0) returns a `Value*` type. From
>
>     errs()<<"\n"<<*I1->getOperand(0)<<"\n";
>     //printed : %3 = load i32* %c, align 4
> Printed as expected. But I want to use %c. Do you know how I can get %c ?
> I need to use the value %c in some computations.
>
> First, I tried
>
>     for (llvm::Value::use_iterator VI=(*I1->getOperand(0)).use_begin(),
> VE=(*I1->getOperand(0)).use_end(); VI != VE ; ++VI)
>       {
>         errs()<<"\n "<<**VI<<" \n";
>         //printed : %cmp3 = icmp ne i32 %3, 0
>       }
> But it is not getting Value* fields. Also, it is printing only one VI per
> for, so VI cannot increment.
>
> Second, it is a solution of taking the output of errs() in a string and
> parse the string for %c ? If so, how I can do it? I have problems while
> trying to declare `static raw_ostream S` in order to take somehow the
> errs() output.
>
> Thank you for any help !
>
>
> --
> Best regards,
> Alexandru Ionut Diaconescu
>
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>


-- 

Thanks,

Justin Holewinski
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