Re: [avr-chat] measuring stack/heap usage

[Christopher Harvey]

Maybe this is an unrelated question, but this topic reminded me to ask:
Is there a way to ask the compiler to report the maximum stack height of a program? I know this is undecidable if there is recursion. Seems really relevant in the case of avrs, since the amount of heap space one can use depends on the amount of stack space used. (heap stack/collisions). I can't think of any way to decide how much heap space to use when I don't know how big the stack can get.

Thanks,
Chris

On 03/14/10 19:19, Daniel Otte wrote:

Hi Tobias,
my ciphers do not use the heap but the testing utils surrounding them do.
Some functions from avrlibc also use the heap
(http://www.nongnu.org/avr-libc/user-manual/malloc.html).

Even if not using the heap the stack can not use all RAM since some C constructs
may result in data put into .data or space allocated in the .bss segment.
You also would have to take care of IO-regisers in the memory map.

Tobias Schneider schrieb:
  

On Sun, 2010-03-14 at 23:29 +0100, Daniel Otte wrote:
    

So in turn the question appears "how far does the heap go?"
      

Well, do you use the heap at all? I would think twice before
implementing a library which uses the heap.

I don't think that any avr-libc library functions use the heap.

So if you don't use any malloc's in your code your heap will always be 0
bytes big.

Greetings,
Tobias



------------------------------------------------------------------------

_______________________________________________
AVR-chat mailing list
address@hidden
http://lists.nongnu.org/mailman/listinfo/avr-chat
    

_______________________________________________
AVR-chat mailing list
address@hidden
http://lists.nongnu.org/mailman/listinfo/avr-chat