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[Frama-c-discuss] [PROVENANCE INTERNET] Re: New Frama-C version: Fluorine

  • Subject: [Frama-c-discuss] [PROVENANCE INTERNET] Re: New Frama-C version: Fluorine
  • From: loic.correnson at cea.fr (Loïc Correnson)
  • Date: Fri, 19 Apr 2013 15:45:19 +0200
  • In-reply-to: <26107_1366378932_r3JDgBS3008854_6CD1ABCC-F4B9-4F61-8DBB-244A2948D3DB@cea.fr>
  • References: <CAEt_dEohQ_aL9UhxzmAN=1reSMwWewwuXFERnAaPFh2ft7tu0w@mail.gmail.com> <26107_1366378932_r3JDgBS3008854_6CD1ABCC-F4B9-4F61-8DBB-244A2948D3DB@cea.fr>
Small detail about your Length axiomatic :

axiomatic Length
  {
    logic integer Length{L}(char *s) reads *s;

    axiom string_length{L}:
       \forall integer n, char *s ; Length_of_str_is(s, n) <==> Length(s) == n ;
  }

This is over-specified. I choose only (==>) in my solution.
Actually, I'm afraid there is an inconsistency with (<==>).
Your axioms proves that for all pointer s, Length_of_str_is(s,Length(s)).
This means that all strings have a length. Which is false, indeed.

	L.