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[Frama-c-discuss] Valid physical address

  • Subject: [Frama-c-discuss] Valid physical address
  • From: anne.pacalet at free.fr (Anne Pacalet)
  • Date: Fri, 04 May 2012 09:50:27 +0200
Hello,

I am trying to use frama-c value analysis on an application
that reads the memory using some physical addresses.
Something like :

unsigned char * p = 0xABCD;
if (*(p + 10) == 1) {
 ...
}

Of course, the value analysis emit an alarm : assert \valid(p+10);
Status: **NOT** VALID according to value analysis (under hypotheses)

The problem is that the test is then considered to be always false
ie. the if branch is said to be dead code.
I don't really understand why...
Is there a way to tell the value analysis to consider the test
to be either true or false ?

Thanks in advance for your help,
-- 
Anne.