[llvm-dev] Difference between AllocaInst::getType() vs AllocaInst::getAllocatedType()

[John Criswell via llvm-dev]

On 6/10/17 9:39 AM, Dipanjan Das via llvm-dev wrote:
>
> From the documentation, I can't understand the difference 
> between AllocaInst::getType() vs AllocaInst::getAllocatedType() 
> methods. Can anyone please enlighten me?

The AllocaInst instruction allocates stack memory.  The value that it 
returns is always a pointer to memory.

You should run an experiment to double-check this, but I believe 
AllocaInst::getType() returns the type of the value that is the result 
of the alloca while AllocaInst::getAllocatedType() returns the type of 
the value that is allocated.  For example, if the alloca allocates a 
struct {int ; int}, then getAllocatedType() returns a struct type and 
getType() return a "pointer to struct" type.

Regards,

John Criswell

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

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