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Getting more information about functions arguments/locals inmachine description
- From: Alexandre Courbot <alexandrecourbot at linuxgames dot com>
- To: GCC List <gcc at gcc dot gnu dot org>
- Date: 03 May 2002 16:25:26 +0200
- Subject: Getting more information about functions arguments/locals inmachine description
Hi everybody,
I somehow asked this question already a few weeks ago, but unfortunately
didn't advance in this area. A little clue or pointer would be of great
help! :)
My problem is that I need to "declare" every argument or local variable
used by a function. Yet the FUNCTION_PROLOGUE allows me to know how many
bytes I need to allocate on the stack for them, but I need more precise
information. I need to know how many arguments/local variables have
being used and their starting offset on the stack (their size would
actually help too), so I can generate something like:
function foo:
.Arg a1, a2, a3
.Local l1, l2, l3
With this information, it'd be quite straightforward to to intercept the
insns accessing to the local variables/arguments and output the label of
the variable instead of an indirect reference. Yet, I still have no clue
on how to get this information.
It seemed to me, that the data structures for per-function information
(as mentionned in the manual) could help, as you can define your own
additional data structure for functions. However, having looked
carefully in function.h and others relevant files, I see no place where
I could retrieve such information.
Is there a possible trick here? Can someone enlighten me? :)
Thank you for your time,
Alex.
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