Re: Where is setup for "goto" in nested function created?

[hutchinsonandy at aim dot com]

I already have nonlocal_goto, and  nonlocal_goto_receiver.

These expect saved frame pointer to be virtual_stack_vars_rtx+1.

For setjmp the value is determined by 
targetm.builtin_setjmp_frame_value - which I defined and is correct.

But for goto the value is created by some other code - which appears to 
be wrong but I can't find!




-----Original Message-----
From: David Daney <ddaney@avtrex.com>
To: hutchinsonandy@aim.com
Cc: gcc@gcc.gnu.org
Sent: Thu, 22 May 2008 1:16 pm
Subject: Re: Where is setup for "goto" in nested function created?


hutchinsonandy@aim.com wrote:Â
> During the process of fixing setjmp for AVR target, I needed to 
define > targetm.builtin_setjmp_frame_value () to be used inÂ
> expand_builtin_setjmp_setup().Â
> > This sets the value of the Frame pointer stored in jump buffer.Â
> > I set this "value" to virtual_stack_vars_rtx+1 (==frame_pointer)Â
> Receiver defined in target latter restores frame pointer using > 
virtual_stack_vars_rtx = value - 1Â
> > This produce correct code as expected and avoids run-time add/sub 
of > offsets. (setjmp works!)Â
> > 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.Â
> > 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.Â
> > So where is the goto setup code created? And is there a bug here?Â
> Â
Perhaps you need to implement one or more of: save_stack_nonlocal, 
restore_stack_nonlocal, nonlocal_goto, and/or nonlocal_goto_receiver.Â
Â
David DaneyÂ