http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi

printCallSite

function printCallSite(callSite) {
      var out = '"' + callSite.getFileName() + '"';
      if (callSite.isEval()) {
        out += " eval";
      }
      if (callSite.isNative()) {
        out += " native";
      }
      if (callSite.isToplevel()) {
        out += " topLevel";
      }

      var origin = callSite.getEvalOrigin();
      if (origin) {
        out += " evalOrigin: " + JSON.stringify(origin);
      }
      return out;
    }