1. 09 Jan, 2013 1 commit
  2. 10 Oct, 2012 1 commit
    • Robbert Krebbers's avatar
      Various minor changes. · 4cda26dd
      Robbert Krebbers authored
      * Introduce a type class and notation for disjointness.
      * Define unions of finite maps (a lot of theory has still to be
        moved from memory to fin_maps).
      * Prove the Hoare rule for function calls with arguments.
      * Prove the Hoare rule to add sets of functions.
      * Some additional theory on lifting of assertions.
      4cda26dd
  3. 04 Sep, 2012 1 commit
  4. 30 Aug, 2012 1 commit
  5. 29 Aug, 2012 1 commit
  6. 21 Aug, 2012 1 commit
    • Robbert Krebbers's avatar
      Major revision of the whole development. · 18669b92
      Robbert Krebbers authored
      The main changes are:
      
      * Function calls in the operational semantics
      * Mutually recursive function calls in the axiomatic semantics
      * A general definition of the interpretation of the axiomatic semantics  so as
        to improve reusability (useful for function calls, and also for expressions
        in future versions)
      * Type classes for stack independent, memory independent, and memory extensible
        assertions, and a lot of instances to automatically derive these properties.
      * Many additional lemmas on the memory and more robust tactics to simplify
        goals involving is_free and mem_disjoint
      * Proof of preservation of statements in the smallstep semantics
      
      * Some new tactics: feed, feed destruct, feed inversion, etc...
      * More robust tactic scripts using bullets and structured scripts
      * Truncate most lines at 80 characters
      18669b92
  7. 21 Jun, 2012 1 commit
  8. 14 Jun, 2012 2 commits
    • Robbert Krebbers's avatar
    • Robbert Krebbers's avatar
      Modify the Hoare judgment such that is also ensures thread safity. · 9fcbbccf
      Robbert Krebbers authored
      Before, it just ensured that whenever one can split up the memory
      into two parts before running the program, the framing part can
      be split off when the program is finished. Now it also ensure that
      it can be split off at any moment during the execution of the
      program.
      
      When we extend to non-deterministic expressions/sequence points we
      certainly need this for the Hoare judgment for expressions, as C
      allows evaluation of them to interleave. However, for consistency,
      and further extensions, it is nice to have this property for
      statements too.
      9fcbbccf
  9. 11 Jun, 2012 1 commit