[LLVMdev] Passing Arguments to External Function Call in llvm pass

Abhinash Jain omnia at mailinator.com
Fri Sep 20 13:08:12 PDT 2013

I have a external function which is like this :-
void foo(int num, ...)
       va_list arguments;
       for(int x=0;x<num;x++)
		long long *oprnd=va_arg ( arguments, long long* );
	va_end ( arguments );

And on llvm pass i have one vector of Value* (i.e. vector<Value*> vect).
which basically contains getoperand(0) of all Load instruction present on
some test program.

  load i32* %a, align 4
  load i32* %b, align 4
  vect.push_back(getoperand(0))     . So on.

Now How can I pass this vector to the external foo(int, ...) function???

What should I use to declare the foo function in my pass (so that it works
fine on both 32-bit and 64-bit system)-
Type::getInt32Ty(*Context) or 
Type::getInt64Ty(*Context) or 
Type::getIntPtr32Ty(*Context) or 
Type::getInt64Ty(*Context). etc.

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