[LLVMdev] Questions regarding the LLVM IR and the Instruction class

[David Blaikie]

On Fri, May 1, 2015 at 1:27 AM, Canumalla Anirudh <anirudh.c.93 at gmail.com>
wrote:

> I have two questions that I need answers to . Hope somebody can help me
>
> 1) The LLVM IR has three forms of representation - In memory, bitcode
> representation and the human readable form. I would like to know the
> differences between the two representations if any.
>
> 2) I will explain my situation and then get to the second question:
>
> I needed the operands of instructions represented in strings and hence I
> used
>  "curr_Ins->getOperand(0)->getname()", where curr_Ins was a variable of
> type Instruction*
>  If there is an instruction that has a direct integer as an operand, I was
> unable to do this. I had to cast that operand to a ConstInt and then obtain
> its value (by the getValue() function) and then convert it to a string.
> If getOperand always returned Value* then why is it that if there was a
> Numerical operand I was unable to invoke the getName() function with it. Is
> it because getOperand(1) returned an object of different type when there
> was a numerical operand. If so, what are the possible types that can come
> as operands to instructions.
>

Lots of things are values, not all of them have names. Here's he full
taxonomy of Values:
http://llvm.org/docs/doxygen/html/classllvm_1_1Value.html


>
> Thanks in advance.
>
> Anirudh
>
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