llvm dev - Sep 2013 - [LLVMdev] Distinguishing Pointer Variable and Ordinary Variable

C Code :-
int main()
{
 int a=10,c;
 int *b;
 c=20;
 *b=a;
 return 0;
}

IR of above code :-
define i32 @main() #0 {
entry:
1.  %retval = alloca i32, align 4
2.  %a = alloca i32, align 4
3.  %c = alloca i32, align 4
4.  %b = alloca i32*, align 8
5.  store i32 0, i32* %retval
6.  store i32 10, i32* %a, align 4
7.  store i32 20, i32* %c, align 4
8.  %0 = load i32* %a, align 4
9.  %1 = load i32** %b, align 8
10.  store i32 %0, i32* %1, align 4
11.  ret i32 0
}


Line 8,9,10 of IR represents  *b=a;

Now I want to recognise whether i32* %1  on line 10 is a pointer variable or
ordinary variable through llvm pass.
So how to solve this issue ???



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Check it's type to see if it's a pointer or not?


On 1 September 2013 12:31, Abhinash Jain <omnia at mailinator.com> wrote:
> C Code :-
> int main()
> {
>  int a=10,c;
>  int *b;
>  c=20;
>  *b=a;
>  return 0;
> }
>
> IR of above code :-
> define i32 @main() #0 {
> entry:
> 1.  %retval = alloca i32, align 4
> 2.  %a = alloca i32, align 4
> 3.  %c = alloca i32, align 4
> 4.  %b = alloca i32*, align 8
> 5.  store i32 0, i32* %retval
> 6.  store i32 10, i32* %a, align 4
> 7.  store i32 20, i32* %c, align 4
> 8.  %0 = load i32* %a, align 4
> 9.  %1 = load i32** %b, align 8
> 10.  store i32 %0, i32* %1, align 4
> 11.  ret i32 0
> }
>
>
> Line 8,9,10 of IR represents  *b=a;
>
> Now I want to recognise whether i32* %1  on line 10 is a pointer variable
> or
> ordinary variable through llvm pass.
> So how to solve this issue ???
>
>
>
> --
> View this message in context:
>
http://llvm.1065342.n5.nabble.com/Distinguishing-Pointer-Variable-and-Ordinary-Variable-tp60881.html
> Sent from the LLVM - Dev mailing list archive at Nabble.com.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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Sorry I have actually edited the post.

I did check its type by using
isa<PointerType>(cast<AllocaInst>(instr->getOperand(1))->getAllocatedType())
but it is only detecting  i32** %b on line 8 of IR as a pointer type.

Whereas I also want to detect the  i32* %1  on line 11 of IR as a pointer
type. So how can I do this??



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