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(* $Id$ *)
open System
open Lib
open Summary
type state = Lib.frozen * Summary.frozen
let get_state () =
(Lib.freeze(), freeze_summaries())
let set_state (fl,fs) =
Lib.unfreeze fl;
unfreeze_summaries fs;
Lib.declare_initial_state()
let state_magic_number = 19764
let (extern_state,intern_state) =
let (raw_extern, raw_intern) = extern_intern state_magic_number ".coq" in
(fun s -> raw_extern s (get_state())),
(fun s -> set_state (raw_intern (Library.get_load_path ()) s))
(* Rollback. *)
let freeze = get_state
let unfreeze = set_state
let with_heavy_rollback f x =
let sum = freeze_summaries ()
and flib = freeze() in
try
f x
with reraise -> begin
unfreeze_summaries sum;
unfreeze flib;
raise reraise
end
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