D.gnu - [Issue 2004] New: no clean way to dynamically loop over va_args
- d-bugmail puremagic.com (33/33) Apr 18 2008 http://d.puremagic.com/issues/show_bug.cgi?id=2004
- d-bugmail puremagic.com (11/11) Jan 31 2011 http://d.puremagic.com/issues/show_bug.cgi?id=2004
http://d.puremagic.com/issues/show_bug.cgi?id=2004 Summary: no clean way to dynamically loop over va_args Product: DGCC aka GDC Version: unspecified Platform: All OS/Version: All Status: NEW Severity: major Priority: P2 Component: glue layer AssignedTo: dvdfrdmn users.sf.net ReportedBy: fawzi gmx.ch OtherBugsDependingO 670,1968 nThis: due to the structure of va_list there is no easy way to loop over unknown arguments. Skipping them based on their size is not easy even using tricks (a template generating a fake structure of the requested size), because also the alignment must be known and it is difficult to gather from typeinfo. One possibility would be to re-implement The cleanest thing would be either to either implement a function void *dyn_va_arg(TypeInfo,va_list) that returns a pointer to the type, and skips it. Barring alignment issues of the arguments passed in the registers, this should be easy for the compiler to implement. If alignment issues are a problem then I think that a void*dyn_va_arg_tmp(TypeInfo,va_list,out bool) that gives a temporary pointer and says if the pointer is temporary could be considered, but only as last resort, if at all possible a clean re-implementation of va_arg for D should be considered. Such a function would make boxer, tangos Layout and similar things possible in a clean way. --
Apr 18 2008
http://d.puremagic.com/issues/show_bug.cgi?id=2004 Iain Buclaw <ibuclaw ubuntu.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |INVALID As per, bug1066, closing. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jan 31 2011