llvm dev - Jul 2015 - [LLVMdev] How can i differentiate pointer type int 32* from int 32** ?

Hi all, as a LLVM beginner I would like to know how can i check the pointer
types with different levels like int 32* and int 32**, int 32***?

By using value->getType()->isPointerTy() i can just know they are
pointers.
But the dump results clearly show they are different. Is there a good way
to calculate their actual point to levels? Thanks!


Best regards,

Shen
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On 7/17/15 12:38 PM, Shen Liu wrote:
> Hi all, as a LLVM beginner I would like to know how can i check the 
> pointer types with different levels like int 32* and int 32**, int 32***?
>
> By using value->getType()->isPointerTy() i can just know they are 
> pointers. But the dump results clearly show they are different. Is 
> there a good way to calculate their actual point to levels? Thanks!
You will need to use dyn_cast<PointerType> to cast the Type * into a 
PointerType *.  Once you do that, you can find the Type * that the 
PointerType points to.

Regards,

John Criswell
>
>
> Best regards,
>
> Shen
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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John, thanks for you answer! But as far as I know LLVM doesn't provide any
interface for finding the pointee of a pointer directly, so i have to
process a multi-level pointer i need to write my own function to check
pointers level by level, is that right?

On Fri, Jul 17, 2015 at 1:47 PM, John Criswell <jtcriswel at gmail.com>
wrote:
>  On 7/17/15 12:38 PM, Shen Liu wrote:
>
> Hi all, as a LLVM beginner I would like to know how can i check the
> pointer types with different levels like int 32* and int 32**, int 32***?
>
>  By using value->getType()->isPointerTy() i can just know they are
> pointers. But the dump results clearly show they are different. Is there a
> good way to calculate their actual point to levels? Thanks!
>
>
> You will need to use dyn_cast<PointerType> to cast the Type * into a
> PointerType *.  Once you do that, you can find the Type * that the
> PointerType points to.
>
> Regards,
>
> John Criswell
>
>
>
>  Best regards,
>
>  Shen
>
>
> _______________________________________________
> LLVM Developers mailing listLLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
> --
> John Criswell
> Assistant Professor
> Department of Computer Science, University of
Rochesterhttp://www.cs.rochester.edu/u/criswell
>
>
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