Commit 49d7e625 authored by Ralf Jung's avatar Ralf Jung

add language.v by Robbert

parent e9fec17a
Require Import prelude.prelude.
Class Language (E V S : Type) := {
to_expr : V E;
of_expr : E option V;
atomic : E Prop;
prim_step : (E * S) (E * S) option E Prop;
of_to_expr v : of_expr (to_expr v) = Some v;
to_of_expr e v : of_expr e = Some v to_expr v = e;
values_stuck e σ s' ef : prim_step (e,σ) s' ef of_expr e = None;
atomic_not_value e : atomic e of_expr e = None;
atomic_step e1 σ1 e2 σ2 ef :
atomic e1
prim_step (e1,σ1) (e2,σ2) ef
is_Some (of_expr e2)
}.
Section foo.
Context `{Language E V St}.
Definition cfg : Type := (list E * St)%type.
Inductive step (ρ1 ρ2 : cfg) : Prop :=
| step_atomic e1 σ1 e2 σ2 ef t1 t2 :
ρ1 = (t1 ++ e1 :: t2, σ1)
ρ1 = (t1 ++ e2 :: t2 ++ option_list ef, σ2)
prim_step (e1, σ1) (e2, σ2) ef
step ρ1 ρ2.
Definition steps := rtc step.
Definition stepn := nsteps step.
End foo.
\ No newline at end of file
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