[llvm-dev] struct size

[Krzysztof Parzyszek via llvm-dev]

On 8/31/2017 8:11 AM, Anastasiya Ruzhanskaya via llvm-dev wrote:
> 
> I want to identify, that %s is pointer to struct, determine what this 
> struct is and determine the size of every component? With every 
> component is more or less ok, but the operand %s is not a struct but a 
> pointer. Is there a convenient way to track this structure usage in 
> getelementptr?

If you have a Type* object that you know it a pointer, you can cast it 
to PointerType*, and then obtain the pointee type via getElementType 
member function.

If you have a Type* object that is a structure, you can cast it to 
StructType*, which then has iterators that allow you to inspect every 
member type.

Look in include/llvm/IR/DerivedTypes.h for more information.

-Krzysztof


-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, 
hosted by The Linux Foundation