GuardingDynamicCallinLinker.java

// The invokeDynamic bootstrap links a
// (BaseType, args*)RetType to (RoleType, args*)RetType
// where there are many different such RoleType which are inner classes of a TeamType

// On the stack we have an BaseType object and args* 

// Iterate over all active Teams
while (teamIterator.hasNext()) {
  ITeam currentTeam = teamIterator.next();
  Class<?> teamClass = currentTeam.getClass();
  // Find the MethodHandle of the role method (before/after/replace callin)
  // with the signature (RoleType, args*)RetType
  MethodHandle roleMethod = ObjectTeamsLookup.findRoleMethod(desc.getLookup(), binding, teamClass);
  // Find the lifting method that maps each BaseType object to its RoleType object
  // with the signature (TeamType, BaseType)RoleType
  MethodHandle liftRoleHandle = ObjectTeamsLookup.findLifting(desc.getLookup(), binding, teamClass);
  // Bind the currentTeam of type TeamType so the liftRoleHandle signature fits
  MethodHandle liftRole = liftRoleHandle.bindTo(currentTeam);
  // filter the argument such that the signature of liftRole will be adapted from
  // (BaseType, args*) to (RoleType, args*)
  MethodHandle callinHandle = MethodHandles.filterArguments(roleMethod, 0, liftRole);
}