 19 Feb, 2013 1 commit


Robbert Krebbers authored
Both the operational and axiomatic semantics are extended with sequence points and a permission system based on fractional permissions. In order to achieve this, the memory model has been completely revised, and is now built on top of an abstract interface for permissions. Apart from these changed, the library on lists and sets has been heavily extended, and minor changed have been made to other parts of the prelude.

 01 Feb, 2013 1 commit


Robbert Krebbers authored

 09 Jan, 2013 3 commits


Robbert Krebbers authored
Conflicts: ars.v assertions.v axiomatic.v base.v doc/index.html expressions.v fin_maps.v memory.v smallstep.v state.v statements.v tactics.v

Robbert Krebbers authored

Robbert Krebbers authored
The development now corresponds exactly to the FoSSaCS 2013 paper. Also, the prelude is updated to the one of the master branch.

 05 Jan, 2013 3 commits


Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored
* Define the standard strict order on pre orders. * Prove that this strict order is well founded for finite sets and finite maps. We also provide some utilities to compute with well founded recursion. * Improve the "simplify_option_equality" tactic to handle more cases. * Axiomatize finiteness of finite maps by translation to lists, instead of by them having a finite domain. * Prove many additional properties of finite maps. * Add many functions and theorems on lists, including: permutations, resize, filter, ...

 12 Nov, 2012 1 commit


Robbert Krebbers authored
Most interestingly: * Use [lia] instead of [omega] everywhere * More many generic lemmas on the memory to the theory on finite maps. * Many additional list lemmas. * A new interface for a monad for collections, which is now also used by the collection tactics. * Provide an additional finite collection implementation using unordered lists without duplicates removed. This implementation forms a monad (just the list monad in disguise).

 19 Oct, 2012 1 commit


Robbert Krebbers authored
The following things have been changed in this revision: * We now give a small step semantics for expressions. The denotational semantics only works for sideeffect free expressions. * Dynamically allocated memory through alloc and free is now supported. * The following expressions are added: assignment, function call, unary operators, conditional, alloc, and free. * Some customary induction schemes for expressions are proven. * The axiomatic semantics (and its interpretation) have been changed in order to deal with nondeterministic expressions. * We have added inversion schemes based on small inversions for the operational semantics. Inversions using these schemes are much faster. * We improved the statement preservation proof of the operational semantics. * We now use a variant of SsReflect's [by] and [done], instead of Coq's [now] and [easy]. The [done] tactic is much faster as it does not perform inversions. * Add theory, definitions and notations on vectors. * Separate theory on contexts. * Change [Arguments] declarations to ensure better unfolding.

 10 Oct, 2012 1 commit


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.

 04 Sep, 2012 1 commit


Robbert Krebbers authored

 30 Aug, 2012 1 commit


Robbert Krebbers authored

 29 Aug, 2012 1 commit


Robbert Krebbers authored
improve some definitions, simplify some proofs.

 23 Aug, 2012 1 commit


Robbert Krebbers authored

 21 Aug, 2012 1 commit


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

 21 Jun, 2012 1 commit


Robbert Krebbers authored

 14 Jun, 2012 2 commits


Robbert Krebbers authored

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 nondeterministic 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.

 11 Jun, 2012 1 commit


Robbert Krebbers authored
