Frama-C-discuss mailing list archives
This page gathers the archives of the old Frama-C-discuss archives, that was hosted by Inria's gforge before its demise at the end of 2020. To search for mails newer than September 2020, please visit the page of the new mailing list on Renater.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Frama-c-discuss] question about a simple example and jessie
- Subject: [Frama-c-discuss] question about a simple example and jessie
- From: naghmeh.ghafari at cslabs.com (Naghmeh Ghafari)
- Date: Mon, 03 May 2010 13:03:33 -0700
Hi, I am trying to verify a very simple bubble sort example, using jessie (Beryllium). My default solver is Alt-Ergo. I used HAVOC (and Z3) to verify this example, which was relatively straight forward. I am using similar loop invariants, but still there is a safety property 'variant decrease' that I can't verify. I think this is because of the While(true) loop I have for which I cannot come up with a proper strictly decreasing loop variant. I also cannot verify my post condition. I appreciate any suggestions or hint. In my version of jessie, I cannot use #pragma JessieTerminationPolicy (user). It is not recognized in my version. cheers, naghmeh #define TRUE 1 #define FALSE 0 /*@ requires size > 0; @ requires \valid(arr+ (0..size-1)); @ ensures \forall int i; 0 <= i <= size - 2 ==> arr[i] <= arr[i+1]; */ void bubble_sort(int *arr, int size) { while (TRUE) { int aux = 0; int i = 0; /*@ loop invariant 0 <= i && i <= size -1 ; @ loop variant size - i; @*/ while (i < size-1) { if (arr[i] > arr[i+1]) { int tmp = arr[i]; arr[i] = arr[i+1]; arr[i+1] = tmp; aux = i; } i++; } if (aux == 0) break; } }
- Follow-Ups:
- [Frama-c-discuss] question about a simple example and jessie
- From: pascal.cuoq at gmail.com (Pascal Cuoq)
- [Frama-c-discuss] question about a simple example and jessie
- From: Claude.Marche at inria.fr (Claude Marche)
- [Frama-c-discuss] question about a simple example and jessie
- Next by Date: [Frama-c-discuss] question about a simple example and jessie
- Next by thread: [Frama-c-discuss] question about a simple example and jessie
- Index(es):