Definition mem_respects_readonly {F V} (ge : Genv.t F V) m :=
forall b gv, Genv.find_var_info ge b = Some gv ->
gvar_readonly gv && negb (gvar_volatile gv) = true ->
Genv.load_store_init_data ge m b 0 (gvar_init gv) /\
Mem.valid_block m b /\ (forall ofs : Z, ~ Mem.perm m b ofs Max Writable).

Lemma mem_respects_readonly_forward {F V} (ge : Genv.t F V) m m'
(MRR: mem_respects_readonly ge m)
(FWD: mem_forward m m')
(RDO: forall b gv, Genv.find_var_info ge b = Some gv ->
gvar_readonly gv && negb (gvar_volatile gv) = true -> readonly m b m'):
mem_respects_readonly ge m'.