[llvm-dev] LLVM Pass for Instructions in Function (error

[Gurunath Kadam via llvm-dev]

Hi Sandeep,

Thanks.

One question about:

Value* AddrPointer = Inst->getIperand(0);

So this works for LVALUE(S) i.e. in my case pointer on LHS of '='. I cannot
find anything online about getloperand online.

For reference this is the instruction:

%ptrA = getelementptr float, float addrspace(1)* %A, i32 %id


I thought if I just get the return value of the instruction then I can get
%ptrA.

Can you please elaborate on that?

Thanks again.

-Gurunath

On Sun, Nov 27, 2016 at 9:21 PM, Dasgupta, Sandeep <sdasgup3 at illinois.edu>
wrote:

> Hi,
>
>
>
>
> Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone
>
>
> -------- Original message --------
> From: Gurunath Kadam via llvm-dev <llvm-dev at lists.llvm.org>
> Date: 11/27/2016 7:49 PM (GMT-06:00)
> To: llvm-dev at lists.llvm.org
> Subject: [llvm-dev] LLVM Pass for Instructions in Function (error
>
> Hi,
>
> Please find the embedded code. Also you may follow
> http://llvm.org/docs/ProgrammersManual.html#iterating-over-the-
> instruction-in-a-function
> -
> Sandeep
>
> I have following lines in my code, where I need to iterate over the
> instructions in the function (not BB):
>
>   for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I){
>     Instruction *Inst = I;
>
> Instruction *Inst = &*I;
>   if (Inst -> getOpcode() == Instruction::GetElementPtr){
>       Value* AddrPointer = Inst->getIperand(0);
>        ....
>
>     if (cast<Operator>(Inst) -> getOpcode() == Instruction::GetElementPtr){
>       Value* AddrPointer = cast<Value>(Inst);
>       Value* threadId = Inst -> getOperand(1);
>       unsigned AddrSpace = Inst -> getAddressSpace()
>       DataStructureForTrace.push_back (std:make_tuple(new
> Value(threadId), AddrSpace, 0, new Value(AddrPointer)));
>     }
>   }
>
> I get following error (there are more, some visible here and some not. for
> eg, getAddressSpace not being for Instruction class.):
>
> error: cannot convert ‘llvm::inst_iterator {aka llvm::InstIterator<llvm::
> SymbolTableList<llvm::BasicBlock>, llvm::ilist_iterator<llvm::
> ilist_detail::node_options<llvm::BasicBlock, false, false, void>, false,
> false>, llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction,
> false, false, void>, false, false>, llvm::Instruction>}’ to
> ‘llvm::Instruction*’ in initialization
>      Instruction *Inst = I;
>
> I am not sure about this, as I am following some online code practices.
>
> Thank you.
>
> Regards,
> Gurunath
>
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