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Peristent vars

 
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pjc30943



Joined: 02 Dec 2005
Posts: 220
Posted: 16 April 2008, 22:53 PM    Post subject: Peristent vars Reply with quote
After compiling, 32 bytes of peristent memory is used--but I haven't declared any persistent variables.
Where do these bytes arise from?

EDIT: compiled for a 1280n
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mikep



Joined: 24 Sep 2005
Posts: 765
Location: Austin, TX
Posted: 16 April 2008, 23:20 PM    Post subject: Reply with quote
The first 32 bytes of persistent memory (chip EEPROM) is reserved by the VM or ZX library. It contains things like the FirstTime flag.

The 32 bytes is not reported by the VM compiler as it already is reserved by the VM. It is reported by the native mode compiler because GCC (avr-size) reports the total memory used for each memory type. Potentially I guess Don could subtract 32 from the persistent memory number so that the compiler results are the same for VM and native mode devices.
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dkinzer
Site Admin


Joined: 03 Sep 2005
Posts: 2499
Location: Portland, OR
Posted: 16 April 2008, 23:38 PM    Post subject: Re: Peristent vars Reply with quote
pjc30943 wrote:
Where do these bytes arise from?
Those are the 32 bytes of Persistent Memory that are reserved for system use. At one time, we were planning to report only the number of bytes of Persistent Memory used by the application. We decided not to do so because we could not report RAM and Program Memory in the same way. The reason we cannot do so for those is because the contribution to RAM and Program Memory use from non-user sources varies depending on which System Library routines are used in a particular application. Moreover, the system and user items are intermixed in the memory spaces (other than Persistent Memory).

If you add the --keep-files option to your project file, you'll find a symbol file produced by the linker that will help you see which elements are from your program; all of them will have name that begin with a prefix like zf_, zv_. All other elements are system elements.
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