I am working on variable arguments on rs6000 backend and I have browsed
gcc/confi g/rs6000/rs6000.c for several times, I found there are
some functions relavtive to this issue, they are setup_incoming_varargs,
rs6000_build_builtin_va_list ,rs6000_va_start ,rs6000_gimplify_va_arg .
I could not know what they do just by source code. Could anybody tell me
the relationship among these routines? I think it is important for me to
understand the mechnism of GCC backend. Any comments or advice are highly
appreciate.
I do not know what is the precondation if I want to do it? May I need to
know the architecture of PowerPC and ABI for it?
Any one could clarify it for me. Thanks in advance!
Best Regards
----------------
Yao Qi
Bejing Institute of Technology
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