X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Flibrary%2FlibrarySync.ml;h=fe631edd2e761579b8d70c27c24490f87c861d4a;hb=da59a744767c799ad287489c55f2ff972f93d93c;hp=d853243ddd06b5a6dc42a423960d8404a546443e;hpb=0ac236dda6f80f6dc86a7f12d8c88b25e64e3251;p=helm.git

diff --git a/helm/ocaml/library/librarySync.ml b/helm/ocaml/library/librarySync.ml
index d853243dd..fe631edd2 100644
--- a/helm/ocaml/library/librarySync.ml
+++ b/helm/ocaml/library/librarySync.ml
@@ -23,8 +23,94 @@
  * http://helm.cs.unibo.it/
  *)
 
+(* $Id$ *)
+
 exception AlreadyDefined of UriManager.uri
 
+let auxiliary_lemmas_hashtbl = UriManager.UriHashtbl.create 29
+
+(* uri |-->  (derived_coercions_in_the_coercion_DB, derived_coercions_in_lib)
+ * 
+ * in case of remove_coercion uri, the first component is removed from the
+ * coercion DB, while the second is passed to remove_obj (and is not [] only if
+ * add_coercion is called with add_composites 
+ * *)
+let coercion_hashtbl = UriManager.UriHashtbl.create 3
+
+let merge_coercions obj =
+  let module C = Cic in
+  let rec aux2 = (fun (u,t) -> u,aux t)
+  and aux = function
+    | C.Rel _ | C.Sort _ as t -> t
+    | C.Meta _ | C.Implicit _ -> assert false
+    | C.Cast (te,ty) -> C.Cast (aux te, aux ty)
+    | C.Prod (name,so,dest) -> 
+        C.Prod (name, aux so, aux dest) 
+    | C.Lambda (name,so,dest) -> 
+        C.Lambda (name, aux so, aux dest)
+    | C.LetIn (name,so,dest) -> 
+        C.LetIn (name, aux so, aux dest)
+    | (Cic.Appl [ c1 ; (Cic.Appl [c2; head]) ]) as t when 
+      CoercGraph.is_a_coercion c1 && CoercGraph.is_a_coercion c2 ->
+        let source_carr = CoercGraph.source_of c2 in
+        let tgt_carr = CoercGraph.target_of c1 in
+        (match CoercGraph.look_for_coercion source_carr tgt_carr 
+        with
+        | CoercGraph.SomeCoercion c -> Cic.Appl [ c ; head ]
+        | _ -> assert false) (* the composite coercion must exist *)
+    | C.Appl l -> C.Appl (List.map aux l)
+    | C.Var (uri,exp_named_subst) -> 
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.Var (uri, exp_named_subst)
+    | C.Const (uri,exp_named_subst) ->
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.Const (uri, exp_named_subst)
+    | C.MutInd (uri,tyno,exp_named_subst) ->
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.MutInd (uri,tyno,exp_named_subst)
+    | C.MutConstruct (uri,tyno,consno,exp_named_subst) ->
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.MutConstruct (uri,tyno,consno,exp_named_subst)  
+    | C.MutCase (uri,tyno,out,te,pl) ->
+        let pl = List.map aux pl in
+        C.MutCase (uri,tyno,aux out,aux te,pl)
+    | C.Fix (fno, fl) ->
+        let fl = List.map (fun (name,idx,ty,bo)->(name,idx,aux ty,aux bo)) fl in
+        C.Fix (fno, fl)
+    | C.CoFix (fno, fl) ->
+        let fl = List.map (fun (name,ty,bo) -> (name, aux ty, aux bo)) fl in
+        C.CoFix (fno, fl)
+  in
+  match obj with
+  | C.Constant (id, body, ty, params, attrs) -> 
+      let body = 
+        match body with 
+        | None -> None 
+        | Some body -> Some (aux body) 
+      in
+      let ty = aux ty in
+        C.Constant (id, body, ty, params, attrs)
+  | C.Variable (name, body, ty, params, attrs) ->
+      let body = 
+        match body with 
+        | None -> None 
+        | Some body -> Some (aux body) 
+      in
+      let ty = aux ty in
+        C.Variable (name, body, ty, params, attrs)
+  | C.CurrentProof (_name, _conjectures, _body, _ty, _params, _attrs) ->
+      assert false
+  | C.InductiveDefinition (indtys, params, leftno, attrs) ->
+      let indtys = 
+        List.map 
+          (fun (name, ind, arity, cl) -> 
+            let arity = aux arity in
+            let cl = List.map (fun (name, ty) -> (name,aux ty)) cl in
+            (name, ind, arity, cl))
+          indtys
+      in
+        C.InductiveDefinition (indtys, params, leftno, attrs)
+
 let uris_of_obj uri =
  let innertypesuri = UriManager.innertypesuri_of_uri uri in
  let bodyuri = UriManager.bodyuri_of_uri uri in
@@ -92,7 +178,15 @@ let index_obj =
   fun ~dbd ~uri ->
    profiler.HExtlib.profile (fun uri -> MetadataDb.index_obj ~dbd ~uri) uri
 
-let add_obj uri obj ~basedir =
+let add_single_obj uri obj ~basedir =
+  let obj = 
+    if List.mem `Generated (CicUtil.attributes_of_obj obj) &&
+       not (CoercGraph.is_a_coercion (Cic.Const (uri, [])))
+    then
+      merge_coercions obj 
+    else
+      obj 
+  in
   let dbd = LibraryDb.instance () in
   if CicEnvironment.in_library uri then
     raise (AlreadyDefined uri)
@@ -119,7 +213,7 @@ let add_obj uri obj ~basedir =
     raise exc
   end
 
-let remove_obj uri =
+let remove_single_obj uri =
   let derived_uris_of_uri uri =
    let innertypesuri, bodyuri, univgraphuri = uris_of_obj uri in
     innertypesuri::univgraphuri::(match bodyuri with None -> [] | Some u -> [u])
@@ -137,6 +231,176 @@ let remove_obj uri =
          HExtlib.rmdir_descend (Filename.dirname file)
       with Http_getter_types.Key_not_found _ -> ());
       ignore (LibraryDb.remove_uri uri);
-      CoercDb.remove_coercion (fun (_,_,u) -> UriManager.eq u uri);
+      (*CoercGraph.remove_coercion uri;*)
       CicEnvironment.remove_obj uri)
   to_remove
+
+(*** GENERATION OF AUXILIARY LEMMAS ***)
+
+let generate_elimination_principles ~basedir uri =
+  let uris = ref [] in
+  let elim sort =
+    try
+      let uri,obj = CicElim.elim_of ~sort uri 0 in
+       add_single_obj uri obj ~basedir;
+       uris := uri :: !uris
+    with CicElim.Can_t_eliminate -> ()
+  in
+  try
+    List.iter elim [ Cic.Prop; Cic.Set; (Cic.Type (CicUniv.fresh ())) ];
+    !uris
+  with exn ->
+   List.iter remove_single_obj !uris;
+   raise exn
+
+(* COERCIONS ***********************************************************)
+  
+let remove_all_coercions () =
+  UriManager.UriHashtbl.clear coercion_hashtbl;
+  CoercDb.remove_coercion (fun (_,_,u1) -> true)
+
+let add_coercion ~basedir ~add_composites uri =
+  let coer_ty,_ =
+    let coer = CicUtil.term_of_uri uri in
+    CicTypeChecker.type_of_aux' [] [] coer CicUniv.empty_ugraph 
+  in
+  (* we have to get the source and the tgt type uri
+   * in Coq syntax we have already their names, but
+   * since we don't support Funclass and similar I think
+   * all the coercion should be of the form
+   * (A:?)(B:?)T1->T2
+   * So we should be able to extract them from the coercion type
+   * 
+   * Currently only (_:T1)T2 is supported.
+   * should we saturate it with metas in case we insert it?
+   * 
+   *)
+  let extract_last_two_p ty =
+    let rec aux = function
+      | Cic.Prod( _, src, Cic.Prod (n,t1,t2)) -> 
+          assert false
+          (* not implemented: aux (Cic.Prod(n,t1,t2)) *)
+      | Cic.Prod( _, src, tgt) -> src, tgt
+      | _ -> assert false
+    in
+    aux ty
+  in
+  let ty_src, ty_tgt = extract_last_two_p coer_ty in
+  let src_uri = CoercDb.coerc_carr_of_term (CicReduction.whd [] ty_src) in
+  let tgt_uri = CoercDb.coerc_carr_of_term (CicReduction.whd [] ty_tgt) in
+  let new_coercions = CicCoercion.close_coercion_graph src_uri tgt_uri uri in
+  let composite_uris = List.map (fun (_,_,uri,_) -> uri) new_coercions in
+  (* update the DB *)
+  List.iter 
+    (fun (src,tgt,uri,_) -> CoercDb.add_coercion (src,tgt,uri)) 
+      new_coercions;
+  CoercDb.add_coercion (src_uri, tgt_uri, uri);
+  (* add the composites obj and they eventual lemmas *)
+  let lemmas = 
+    if add_composites then
+      List.fold_left
+        (fun acc (_,_,uri,obj) -> 
+          add_single_obj ~basedir uri obj;
+          uri::acc) 
+        composite_uris new_coercions
+    else
+      []
+  in
+  (* store that composite_uris are related to uri. the first component is the
+   * stuff in the DB while the second is stuff for remove_obj *)
+  UriManager.UriHashtbl.add coercion_hashtbl uri 
+    (composite_uris,if add_composites then composite_uris else []);
+  lemmas
+
+let remove_coercion uri =
+  try
+    let (composites_in_db, composites_in_lib) = 
+      UriManager.UriHashtbl.find coercion_hashtbl uri 
+    in
+    UriManager.UriHashtbl.remove coercion_hashtbl uri;
+    CoercDb.remove_coercion (fun (_,_,u) -> UriManager.eq uri u);
+    (* remove from the DB *) 
+    List.iter 
+      (fun u -> CoercDb.remove_coercion (fun (_,_,u1) -> UriManager.eq u u1))
+      composites_in_db;
+    (* remove composites from the lib *)
+    List.iter remove_single_obj composites_in_lib
+  with
+    Not_found -> () (* mhh..... *)
+    
+
+let generate_projections ~basedir uri fields =
+ let uris = ref [] in
+ let projections = CicRecord.projections_of uri (List.map fst fields) in
+  try
+   List.iter2 
+    (fun (uri, name, bo) (_name, coercion) ->
+      try
+       let ty, ugraph =
+         CicTypeChecker.type_of_aux' [] [] bo CicUniv.empty_ugraph in
+       let attrs = [`Class `Projection; `Generated] in
+       let obj = Cic.Constant (name,Some bo,ty,[],attrs) in
+       
+        add_single_obj ~basedir uri obj;
+        let composites = 
+         if coercion then
+            add_coercion ~basedir ~add_composites:true uri
+          else  
+            []
+        in
+        uris := uri :: composites @ !uris
+      with
+         CicTypeChecker.TypeCheckerFailure s ->
+          HLog.message
+           ("Unable to create projection " ^ name ^ " cause: " ^ Lazy.force s);
+       | CicEnvironment.Object_not_found uri ->
+          let depend = UriManager.name_of_uri uri in
+           HLog.message
+            ("Unable to create projection " ^ name ^ " because it requires " ^
+               depend)
+    ) projections fields;
+   !uris
+  with exn ->
+   List.iter remove_single_obj !uris;
+   raise exn
+
+
+let add_obj uri obj ~basedir =
+ add_single_obj uri obj ~basedir;
+ let uris = ref [] in
+ try
+  begin
+   match obj with
+    | Cic.Constant _ -> ()
+    | Cic.InductiveDefinition (_,_,_,attrs) ->
+        uris := !uris @ generate_elimination_principles ~basedir uri;
+        let rec get_record_attrs =
+          function
+          | [] -> None
+          | (`Class (`Record fields))::_ -> Some fields
+          | _::tl -> get_record_attrs tl
+        in
+         (match get_record_attrs attrs with
+         | None -> () (* not a record *)
+         | Some fields ->
+            uris := !uris @ (generate_projections ~basedir uri fields))
+    | Cic.CurrentProof _
+    | Cic.Variable _ -> assert false
+  end;
+  UriManager.UriHashtbl.add auxiliary_lemmas_hashtbl uri !uris;
+  !uris
+ with exn ->
+  List.iter remove_single_obj !uris;
+  raise exn
+
+let remove_obj uri =
+ let uris =
+  try
+   let res = UriManager.UriHashtbl.find auxiliary_lemmas_hashtbl uri in
+    UriManager.UriHashtbl.remove auxiliary_lemmas_hashtbl uri;
+    res
+  with
+    Not_found -> [] (*assert false*)
+ in
+  List.iter remove_single_obj (uri::uris)
+