Re: Mangle functions

[Daniel Lohmann <daniel dot lohmann at informatik dot uni-erlangen dot de>]

On 30.01.2008, at 11:53, Ron Kreymborg wrote:
> > > static void MyOverflowInterrupt(void) asm("__vector_16")
> > >                __attribute__ ((signal, __INTR_ATTRS));
> >
> > Oh, this one is actually easy :-)
> >
> > You just need another macro-indirection that uses the "stringify"
> > operator (#) of the pre-processor:
> >
> > > > > >
> > lohmann@mocca:~/tmp$ cat test.cpp
> > #define TIMER0_OVF_vect      _VECTOR(16)
> > #define _VECTOR(N)  __vector_ ## N
> >
> > #define IRQ_VECTOR(vec) asm(#vec) __attribute__ ((signal,
> > __INTR_ATTRS))
> >
> > class Timer0 {
> >   static void MyOverflowInterrupt(void) IRQ_VECTOR(TIMER0_OVF_vect);
> > };
> > <<<<
> >
> > After pre-processing this becomes:
> >
> > > > > >
> > lohmann@mocca:~/tmp$ g++ -E test.cpp
> >
> > class Timer0 {
> >   static void MyOverflowInterrupt(void) asm("TIMER0_OVF_vect")
> > __attribute__ ((signal, __INTR_ATTRS));
> > };
> > <<<<
> >
> > Daniel
> >
> > P.S. Answers to to the list, please. Other readers might  be
> > interested and contribute as well.
>
> Sorry, I was not too clear here. The user does not really know the  
> vector
> number, only the "TIMER_OVF_vect" name. So the user definition:
>
> static void MyOverflowInterrupt(void) asm(TIMER0_OVF_vect)
>                 __attribute__ ((signal, __INTR_ATTRS));
>
> must end up after macro substitution being presented to the compiler  
> like:
>
> static void MyOverflowInterrupt(void) asm("__vector_16")
>                 __attribute__ ((signal, __INTR_ATTRS));
>
> Perhaps not quite so easy :-(


Oh, sorry. In my attempt to explain things as simple as possible I  
over-simplified the number of macro indirections. With the following  
it should work:

>>>
lohmann@mocca:~/tmp$ cat test.cpp
#define TIMER0_OVF_vect      _VECTOR(16)
#define _VECTOR(N)  __vector_ ## N
#define STRINGIFY(x) #x
#define IRQ_VECTOR(vec) asm(STRINGIFY(vec)) __attribute__ ((signal,  
__INTR_ATTRS))

class Timer0 {
  static void MyOverflowInterrupt(void) IRQ_VECTOR(TIMER0_OVF_vect);
};
<<<
>>>
lohmann@mocca:~/tmp$ cat test.cpp ; g++ -E test.cpp

class Timer0 {
  static void MyOverflowInterrupt(void) asm("__vector_16")  
__attribute__ ((signal, __INTR_ATTRS));
};
<<<

Daniel