[cfe-dev] Custom calling conventions in C code

Holger Schurig hs4233 at mail.mn-solutions.de
Tue Jun 24 00:00:53 PDT 2008

> I think it would be a great thing for compiler hackers to have
> a mechanism to access an arbitrary calling convention, but I
> also think it would be a disaster to expose this to end user
> code.

Maybe via attributes and macros.

  __attribute__(("cc-call-randomly")) \
  __attribute__(("cc-indirect-accumulator-access")) \

And then I write

void weird_function(void) __CC_WEIRD_EMBEDDED_COMPILER
    // ...

> The problem is that not all constructs are valid with 
> every calling convention, and if there is ever a large install
> base of code using "calling convention 19" in their C code,
> we'd have to support that forever.

Not with a scheme similar to the like above.

However, you'd need to support the specific attribute forever. 
Not sure if that is a win :-)

More information about the cfe-dev mailing list