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

[Mehdi Amini via llvm-dev]

> On Nov 27, 2016, at 6:40 PM, Gurunath Kadam via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> 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.


%ptrA is not the return value of the instruction, it *is* the instruction itself.

— 
Mehdi



> 
> Can you please elaborate on that?
> 
> Thanks again.
> 
> -Gurunath
> 
> On Sun, Nov 27, 2016 at 9:21 PM, Dasgupta, Sandeep <sdasgup3 at illinois.edu <mailto: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 <mailto:llvm-dev at lists.llvm.org>> 
> Date: 11/27/2016 7:49 PM (GMT-06:00) 
> To: llvm-dev at lists.llvm.org <mailto: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 <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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