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Diffstat (limited to 'contrib/correctness/pdb.ml')
| -rw-r--r-- | contrib/correctness/pdb.ml | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/contrib/correctness/pdb.ml b/contrib/correctness/pdb.ml new file mode 100644 index 00000000..302db871 --- /dev/null +++ b/contrib/correctness/pdb.ml @@ -0,0 +1,165 @@ +(************************************************************************) +(* v * The Coq Proof Assistant / The Coq Development Team *) +(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *) +(* \VV/ **************************************************************) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(************************************************************************) + +(* Certification of Imperative Programs / Jean-Christophe Filliātre *) + +(* $Id: pdb.ml,v 1.8.2.1 2004/07/16 19:30:01 herbelin Exp $ *) + +open Names +open Term +open Termops +open Nametab +open Constrintern + +open Ptype +open Past +open Penv + +let cci_global id = + try + global_reference id + with + _ -> raise Not_found + +let lookup_var ids locop id = + if List.mem id ids then + None + else begin + try Some (cci_global id) + with Not_found -> Perror.unbound_variable id locop + end + +let check_ref idl loc id = + if (not (List.mem id idl)) & (not (Penv.is_global id)) then + Perror.unbound_reference id loc + +(* db types : only check the references for the moment *) + +let rec check_type_v refs = function + | Ref v -> + check_type_v refs v + | Array (c,v) -> + check_type_v refs v + | Arrow (bl,c) -> + check_binder refs c bl + | TypePure _ -> + () + +and check_type_c refs ((_,v),e,_,_) = + check_type_v refs v; + List.iter (check_ref refs None) (Peffect.get_reads e); + List.iter (check_ref refs None) (Peffect.get_writes e) + (* TODO: check_condition on p and q *) + +and check_binder refs c = function + | [] -> + check_type_c refs c + | (id, BindType (Ref _ | Array _ as v)) :: bl -> + check_type_v refs v; + check_binder (id :: refs) c bl + | (_, BindType v) :: bl -> + check_type_v refs v; + check_binder refs c bl + | _ :: bl -> + check_binder refs c bl + +(* db binders *) + +let rec db_binders ((tids,pids,refs) as idl) = function + | [] -> + idl, [] + | (id, BindType (Ref _ | Array _ as v)) as b :: rem -> + check_type_v refs v; + let idl',rem' = db_binders (tids,pids,id::refs) rem in + idl', b :: rem' + | (id, BindType v) as b :: rem -> + check_type_v refs v; + let idl',rem' = db_binders (tids,id::pids,refs) rem in + idl', b :: rem' + | ((id, BindSet) as t) :: rem -> + let idl',rem' = db_binders (id::tids,pids,refs) rem in + idl', t :: rem' + | a :: rem -> + let idl',rem' = db_binders idl rem in idl', a :: rem' + + +(* db programs *) + +let db_prog e = + (* tids = type identifiers, ids = variables, refs = references and arrays *) + let rec db_desc ((tids,ids,refs) as idl) = function + | (Variable x) as t -> + (match lookup_var ids (Some e.loc) x with + None -> t + | Some c -> Expression c) + | (Acc x) as t -> + check_ref refs (Some e.loc) x; + t + | Aff (x,e1) -> + check_ref refs (Some e.loc) x; + Aff (x, db idl e1) + | TabAcc (b,x,e1) -> + check_ref refs (Some e.loc) x; + TabAcc(b,x,db idl e1) + | TabAff (b,x,e1,e2) -> + check_ref refs (Some e.loc) x; + TabAff (b,x, db idl e1, db idl e2) + | Seq bl -> + Seq (List.map (function + Statement p -> Statement (db idl p) + | x -> x) bl) + | If (e1,e2,e3) -> + If (db idl e1, db idl e2, db idl e3) + | While (b,inv,var,bl) -> + let bl' = List.map (function + Statement p -> Statement (db idl p) + | x -> x) bl in + While (db idl b, inv, var, bl') + + | Lam (bl,e) -> + let idl',bl' = db_binders idl bl in Lam(bl', db idl' e) + | Apply (e1,l) -> + Apply (db idl e1, List.map (db_arg idl) l) + | SApp (dl,l) -> + SApp (dl, List.map (db idl) l) + | LetRef (x,e1,e2) -> + LetRef (x, db idl e1, db (tids,ids,x::refs) e2) + | Let (x,e1,e2) -> + Let (x, db idl e1, db (tids,x::ids,refs) e2) + + | LetRec (f,bl,v,var,e) -> + let (tids',ids',refs'),bl' = db_binders idl bl in + check_type_v refs' v; + LetRec (f, bl, v, var, db (tids',f::ids',refs') e) + + | Debug (s,e1) -> + Debug (s, db idl e1) + + | Expression _ as x -> x + | PPoint (s,d) -> PPoint (s, db_desc idl d) + + and db_arg ((tids,_,refs) as idl) = function + | Term ({ desc = Variable id } as t) -> + if List.mem id refs then Refarg id else Term (db idl t) + | Term t -> Term (db idl t) + | Type v as ty -> check_type_v refs v; ty + | Refarg _ -> assert false + + and db idl e = + { desc = db_desc idl e.desc ; + pre = e.pre; post = e.post; + loc = e.loc; info = e.info } + + in + let ids = Termops.ids_of_named_context (Global.named_context ()) in + (* TODO: separer X:Set et x:V:Set + virer le reste (axiomes, etc.) *) + let vars,refs = all_vars (), all_refs () in + db ([],vars@ids,refs) e +;; + |