BetterC + Windows + setjmp longjmp

[Diederik de Groot]

On Thursday, 20 September 2018 at 12:11:55 UTC, SrMordred wrote:
> Ok, after a better look at the sources I finally got it:
>
> setjmp is a macro.
> the true function signature is "int _setjmp(jmp_buf, void*)"
>
> the void* is the current function address which in mingw 
> sources are capture by "__builtin_frame_address(0)".
>
> And I did´t look yet to see if Dlang have an equivalent.
> but calling _setjmp(jmp_buf, null); the simple examples are 
> working :)

Nice to see you managed to figure it all out, congrats!

So it now looks something like this ?:

version(Windows) {
   version(X86)
     enum _JBLEN = 64;
   else version(X86_64)
     enum _JBLEN = 256;
   else version(IA64)
     enum _JBLEN = 528;
   alias ubyte[_JBLEN] jmp_buf;

   extern (C) {
     int  _setjmp(ref jmp_buf, null);
     void longjmp(ref jmp_buf, int);
   }
   alias _setjmp setjmp;
}

Hopefully you will be able to merge the two examples and create a 
nice druntime PR out of it. The 
https://forum.dlang.org/post/mmxwhdypncaeikknlpyq@forum.dlang.org 
version does look a lot cleaner (but also a little more cryptic).
Might be wise to follow the core.sys.posix.setjmp.d 
implementation. If available, maybe also add the sigsetjmp / 
siglonggmp and sigaction versions (if available on windows).

Good luck !