Library POCS.Lab1.VariablesImpl

Require Import POCS.
Require Import VariablesAPI.

An implementation of Variables.

This implementation is in Haskell and we assume it is correct.

Extraction Language Haskell.

Module Vars <: VarsAPI.

  Axiom init : proc InitResult.
  Axiom read : var -> proc nat.
  Axiom write : var -> nat -> proc unit.
  Axiom recover : proc unit.

  Axiom abstr : Abstraction State.

  Axiom init_ok : init_abstraction init recover abstr inited_any.
  Axiom read_ok : forall v, proc_spec (read_spec v) (read v) recover abstr.
  Axiom write_ok : forall v val, proc_spec (write_spec v val) (write v val) recover abstr.
  Axiom recover_noop : rec_noop recover abstr no_crash.

End Vars.

Extract Constant Vars.init => "Variables.Ops.init".
Extract Constant Vars.read => "Variables.Ops.read".
Extract Constant Vars.write => "Variables.Ops.write".