[llvm-dev] How to know the sub-class of a Value class?

[Jeremy Lakeman via llvm-dev]

http://llvm.org/docs/ProgrammersManual.html#the-isa-cast-and-dyn-cast-templates

On Mon, Jun 12, 2017 at 3:24 PM, Dipanjan Das via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

>
> As a concrete question, I understand 'Value' class is the parent of many
> concrete sub-classes. Let's say I retrieve a Value* value =
> store_inst->getValueOperand(). Unless I know what the sub-type is, how can
> I further use this object? I tried something like this:
>
> =================================================
>
>          Value* value = store_inst->getValueOperand()
>          errs() << value->getValueID; // Which ID corresponds to which
> sub-class?
>          errs() << value->getValueName(); // Prints numeric memory
> addresses
>          errs() << *value->getValueName(); // Doesn't compile
>
> =================================================
>
> I have mentioned the issues in each of the cases above. I am not sure if
> the approach is correct or not. Please help me out.
>
> --
>
> Thanks & Regards,
> Dipanjan
>
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>
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