Re: What is the address of this line?

[Andrew Haley <aph at redhat dot com>]

Brian Dessent writes:
 > John Carter wrote:
 > 
 > > So we using gcc on an embedded platform. ie. Very constrained flash & ram.
 > > 
 > > We also using asserts.
 > > 
 > > Storing __LINE__ and __FILE__ is taking too much flash.
 > > 
 > > Question: I would like to create an assert macro ....
 > > 
 > > #define Assert( expression) do {\
 > >    if(!(expression)) { \
 > >      assert_occurred_at_program_counter = THE_ADDRESS_OF_THIS_LINE(); \
 > >    }
 > > } while(0)
 > > 
 > > So how do I write that magical function / macro
 > > THE_ADDRESS_OF_THIS_LINE(); That returns the address / PC at that line?
 > > Preferable in a CPU neutral fashion, otherwise for a Sparc CPU.
 > 
 > How about something like: (see also section 5.2 of the manual)
 > 
 > #define Assert(expression) ({ \
 >     __label__ here; \
 >     if (!(expression)) { \
 >         here: assert_occurred_at_program_counter = &&here; \
 >     } \
 > })

I also thought of

void *foo ()
{
  return __builtin_return_address(0);
}

Andrew.