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[Frama-c-discuss] memory allocation + pointers

  • Subject: [Frama-c-discuss] memory allocation + pointers
  • From: maria.christofis at (Maria Christofi)
  • Date: Fri, 8 Aug 2014 12:48:17 +0200

Good morning,

I have a problem with the code below.
I want to prove the two postconditions with the Jessie plugin, but it
doesn't seem possible..
I think that what's missing is something saying that only a[0] changes in
the first instruction and only a[1] in the second one (every a[i] except
the one concerned stays unchanged).

Am I right? Is it possible?

Have an nice evening!

int *d, *b;

/*@ requires \valid(a) &&
@ \valid(b) &&
  @     \base_addr(a) != \base_addr(b);
  @ assigns *a;
  @ ensures a[0] == (\at(a[0],Pre)+\at(b[3],Pre));
  @ ensures a[1] == (\at(a[1],Pre)+\at(b[\at(a[4],Pre)],Pre));

void test (int *a, int i)
a[0] ^= b[3]

a[1] ^= b[a[4]];

Maria Christofi
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