Rules and Limitations

• The return statement is not permitted in a naked function. However, you can return an int by moving the return value into the EAX register before the RET instruction.
  
  
• Structured exception handling constructs are not permitted in a naked function, because the constructs must unwind across the stack frame.
  
  
• The setjmp run-time function cannot be used in a naked function, because it too must unwind across the stack frame. However, use of the longjmp run-time function is permitted.
  
  
• Use of the _alloca function is not permitted in a naked function.
  
  
• To ensure that no initialization code for local variables appears before the prolog sequence, initialized local variables are not permitted at function scope. In particular, the declaration of C++ objects is not permitted at function scope. There can, however, be initialized data in a nested scope.
  
  
• Frame pointer optimization (the /Oy compiler option) is not recommended, but it is automatically suppressed for a naked function.