llvm dev - Nov 2016 - Code generation for custom attribute

Hi All,

I am kind of begginer in using llvm. I need to add the custom attribute 
in clang and then generate custom code for delcaration having that 
attribute.

I have succesfully added my custom attributed to clang by following the 
tutorial 
(http://clang.llvm.org/docs/InternalsManual.html#how-to-add-an-attribute). 
Now I can use my attribute for example

__attribute__((myAttr(1))) unsigned int a, b;

and it doesnt give any warning.

I have also added a handle function in SemaDeclAttr.cpp with following 
defination.

static void handleMyAttr(Sema &S, Decl *D,
	const AttributeList &Attr)
{
	if (D->hasAttr<myAttrAttr>())
	{
         //Not sure what to do here

	}


}


I need your advice/help on how I can use this custom attribute to 
generate custom code for variable having myAttr (for example int a, b as 
mentioned above).

Thanks in advance for any help.

-- 
Naveed Ul Mustafa