During the process of fixing setjmp for AVR target, I needed to define
targetm.builtin_setjmp_frame_value () to be used in
expand_builtin_setjmp_setup().
This sets the value of the Frame pointer stored in jump buffer.
I set this "value" to virtual_stack_vars_rtx+1 (==frame_pointer)
Receiver defined in target latter restores frame pointer using
virtual_stack_vars_rtx = value - 1
This produce correct code as expected and avoids run-time add/sub of
offsets. (setjmp works!)
However, for a normal goto used inside a nested function, a different
part of gcc creates the code to store frame pointer (not
expand_builtin_setjmp_setup). I can't find this code.
The issue I have is that this "goto_setup" code does NOT use
targetm.builtin_setjmp_frame_value - but seems to use
value=virtual_stack_vars_rtx, which is incompatible with my target
receiver.
So where is the goto setup code created? And is there a bug here?
regards
Andy
