c++ - LLVM: Creating a CallInst with a null pointer operand -

i'm trying use llvm c++ bindings write pass generates following ir

%1 = call i64 @time(i64* null) #3 

@time here c standard library time() function.

here's code i've written

void pass::insert(basicblock *bb, type *timety, module *m) {   type *timetype[1];   timetype[0] = timety;   arrayref<type *> timetypearef(timetype, 1);   value *args[1];   args[0] = constantint::get(timety, 0, false);   arrayref<value *> argsref(args, 1);   functiontype *signature = functiontype::get(timety, false);   function *timefunc =       function::create(signature, function::externallinkage, "time", m);   irbuilder<> builder(&*(bb->getfirstinsertionpt()));   allocainst *a1 = builder.createalloca(timety, nullptr, twine("a1"));   callinst *c1 = builder.createcall(timefunc, args, twine("time")); } 

this compiles, results in following error when run

incorrect number of arguments passed called function!   %time = call i64 @time(i64 0) 

as understand this, need pass int64 pointer deferences nullptr, i'm unable figure out how that.

llvm provides constantpointernull class want - returns null pointer of required type.

all needs changed line beginning args[0] = ... args[0] = constantpointernull::get(pointertype::get(timety, 0));.