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[Frama-c-discuss] Jessie and CHAR_MIN

  • Subject: [Frama-c-discuss] Jessie and CHAR_MIN
  • From: jens.gerlach at first.fraunhofer.de (Jens Gerlach)
  • Date: Sun, 24 May 2009 20:49:32 +0200
Hi,

I wrote a short program in order to find out whether Jessie  
understands the limits of the builti-in
integer types (see Section 5.2.4.2.1 Sizes of integer types <limits.h>  
in http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1256.pdf).

-----

char char_range(char i)
{
     //@ assert i >= CHAR_MIN;
     //@ assert i <= CHAR_MAX;
     return i;
}

signed char schar_range(signed char i)
{
     //@ assert i >= SCHAR_MIN;
     //@ assert i <= SCHAR_MAX;
     return i;
}

unsigned char uchar_range(unsigned char i)
{
     //@ assert i >= UCHAR_MIN;
     //@ assert i <= UCHAR_MAX;
     return i;
}

short short_range(short i)
{
     //@ assert i >= SHRT_MIN;
     //@ assert i <= SHRT_MAX;
     return i;
}

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

I compiled with "frama-c -jessie-analysis -jessie-int-model modulo - 
jessie-gui ranges.c" and noticed the following:

1.) I did not need to include limits.h
	So Jessie nows about these limits?

2.) All three provers (alt-ergo, yices, CVC3) that I used under Mac OS  
X cannot prove the line
	 //@ assert i >= CHAR_MIN;
       Is this an oversight?

3.) The line  //@ assert i >= UCHAR_MIN; is not recognised at all.


Regards Jens, Berlin

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