Section FineMachineInternal.
Context {initU : seq nat}
{semAx: CoreLanguage.SemAxioms}
{dilMem: DiluteMem}.
Notation fmachine_step := ((corestep (AsmContext.fine_semantics initU))).
(*TODO: maybe move to tactics *)
(** Solves absurd cases from fine-grained internal steps *)
Ltac absurd_internal Hstep :=
inversion Hstep; try inversion Htstep; subst; Tactics.pf_cleanup; simpl in *;
try match goal with
| [H: Some _ = Some _ |- _] => inversion H; subst
end; Tactics.pf_cleanup;
repeat match goal with
| [H: getThreadC ?Pf = _, Hint: ?Pf$_ @ I |- _] =>
unfold getStepType in Hint; simpl in *;
rewrite H in Hint; simpl in Hint
| [H1: match ?Expr with _ => _ end = _,
H2: ?Expr = _ |- _] => rewrite H2 in H1
end; try discriminate; try (exfalso; by auto).
Opaque getThreadC updThreadC containsThread updThread updLockSet addThread remLockSet getThreadR lockSet.
Opaque lockRes.

Lemma gsoLockRes_fstepI :
forall tp tp' (m m' : mem) i tr tr'
U (pfi : containsThread tp i)
(Hcomp: mem_compatible tp m),
let mrestr := restrPermMap (((compat_th _ _ Hcomp) pfi).1) in
forall (Hinternal: pfi$mrestr @ I)
(Hstep: fmachine_step (i :: U,tr, tp) m (U, tr', tp') m'),
lockRes tp' = lockRes tp.