llvm dev - Nov 2016 - LLVM Pass for Instructions in Function (error

Oh sorry that was a typo. it's just getOperand (0). This is in order to get
the first operand of getelementptr, which is the base address  pointer (%A in
your listing). Now as I can see that   you want to store  ptrA in some data
structure; you can just  store the Inst instead  as the virtual register ptrA
itself represent the instruction.

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-------- Original message --------
From: Gurunath Kadam <gurunath.kadam at gmail.com>
Date: 11/27/2016 8:40 PM (GMT-06:00)
To: "Dasgupta, Sandeep" <sdasgup3 at illinois.edu>
Cc: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] LLVM Pass for Instructions in Function (error

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<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<https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_docs_ProgrammersManual.html-23iterating-2Dover-2Dthe-2Dinstruction-2Din-2Da-2Dfunction&d=DQMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=at_zHdaJ5pMt_A20sKa_JLbvjeXndNos3PveVfgUF0o&m=sgKJsUvkCaaRtnodZerk-FVpqAHHpzk5gPC7VImAiN0&s=E-fekZNyRFShLug4UZybHsL4iibcKy_cmvdRExTT23s&e=>
-
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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