test.js

function foo(x) {
  return x;
}

function bar() {
  return foo.call(this, 42);
}

var calls = [];

var _call = Function.prototype.call;
Function.prototype.call = function(){
  calls.push(arguments.callee.caller.name);
  _call.apply(this, arguments);
}

bar();
bar();
bar();

Function.prototype.call = _call;

for (var i=0; i<calls.length; i++) {
  console.log(calls[i]);
}