Imported Upstream version 8.2~beta3+dfsgupstream/8.2.beta3+dfsg

22 files changed, 1393 insertions, 471 deletions

diff --git a/contrib/dp/Dp.v b/contrib/dp/Dp.v
new file mode 100644
index 00000000..857c182c
--- /dev/null
+++ b/contrib/dp/Dp.v
@@ -0,0 +1,120 @@
+(* Calls to external decision procedures *)
+
+Require Export ZArith.
+Require Export Classical.
+
+(* Zenon *)
+
+(*  Copyright 2004 INRIA  *)
+(*  $Id: Dp.v 10739 2008-04-01 14:45:20Z herbelin $  *)
+
+Lemma zenon_nottrue :
+  (~True -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_noteq : forall (T : Type) (t : T),
+  ((t <> t) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_and : forall P Q : Prop,
+  (P -> Q -> False) -> (P /\ Q -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_or : forall P Q : Prop,
+  (P -> False) -> (Q -> False) -> (P \/ Q -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_imply : forall P Q : Prop,
+  (~P -> False) -> (Q -> False) -> ((P -> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_equiv : forall P Q : Prop,
+  (~P -> ~Q -> False) -> (P -> Q -> False) -> ((P <-> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notand : forall P Q : Prop,
+  (~P -> False) -> (~Q -> False) -> (~(P /\ Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notor : forall P Q : Prop,
+  (~P -> ~Q -> False) -> (~(P \/ Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notimply : forall P Q : Prop,
+  (P -> ~Q -> False) -> (~(P -> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notequiv : forall P Q : Prop,
+  (~P -> Q -> False) -> (P -> ~Q -> False) -> (~(P <-> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_ex : forall (T : Type) (P : T -> Prop),
+  (forall z : T, ((P z) -> False)) -> ((exists x : T, (P x)) -> False).
+Proof. firstorder. Qed.
+
+Lemma zenon_all : forall (T : Type) (P : T -> Prop) (t : T),
+  ((P t) -> False) -> ((forall x : T, (P x)) -> False).
+Proof. firstorder. Qed.
+
+Lemma zenon_notex : forall (T : Type) (P : T -> Prop) (t : T),
+  (~(P t) -> False) -> (~(exists x : T, (P x)) -> False).
+Proof. firstorder. Qed.
+
+Lemma zenon_notall : forall (T : Type) (P : T -> Prop),
+  (forall z : T, (~(P z) -> False)) -> (~(forall x : T, (P x)) -> False).
+Proof. intros T P Ha Hb. apply Hb. intro. apply NNPP. exact (Ha x). Qed.
+
+Lemma zenon_equal_base : forall (T : Type) (f : T), f = f.
+Proof. auto. Qed.
+
+Lemma zenon_equal_step :
+  forall (S T : Type) (fa fb : S -> T) (a b : S),
+  (fa = fb) -> (a <> b -> False) -> ((fa a) = (fb b)).
+Proof. intros. rewrite (NNPP (a = b)). congruence. auto. Qed.
+
+Lemma zenon_pnotp : forall P Q : Prop,
+  (P = Q) -> (P -> ~Q -> False).
+Proof. intros P Q Ha. rewrite Ha. auto. Qed.
+
+Lemma zenon_notequal : forall (T : Type) (a b : T),
+  (a = b) -> (a <> b -> False).
+Proof. auto. Qed.
+
+Ltac zenon_intro id :=
+  intro id || let nid := fresh in (intro nid; clear nid)
+.
+
+Definition zenon_and_s := fun P Q a b => zenon_and P Q b a.
+Definition zenon_or_s := fun P Q a b c => zenon_or P Q b c a.
+Definition zenon_imply_s := fun P Q a b c => zenon_imply P Q b c a.
+Definition zenon_equiv_s := fun P Q a b c => zenon_equiv P Q b c a.
+Definition zenon_notand_s := fun P Q a b c => zenon_notand P Q b c a.
+Definition zenon_notor_s := fun P Q a b => zenon_notor P Q b a.
+Definition zenon_notimply_s := fun P Q a b => zenon_notimply P Q b a.
+Definition zenon_notequiv_s := fun P Q a b c => zenon_notequiv P Q b c a.
+Definition zenon_ex_s := fun T P a b => zenon_ex T P b a.
+Definition zenon_notall_s := fun T P a b => zenon_notall T P b a.
+
+Definition zenon_pnotp_s := fun P Q a b c => zenon_pnotp P Q c a b.
+Definition zenon_notequal_s := fun T a b x y => zenon_notequal T a b y x.
+
+(* Ergo *)
+
+Set Implicit Arguments.
+Section congr.
+  Variable t:Type.
+Lemma ergo_eq_concat_1 : 
+  forall (P:t -> Prop) (x y:t),
+    P x -> x = y -> P y.
+Proof.
+  intros; subst; auto.
+Qed.
+
+Lemma ergo_eq_concat_2 : 
+  forall (P:t -> t -> Prop) (x1 x2 y1 y2:t),
+    P x1 x2 -> x1 = y1 -> x2 = y2 -> P y1 y2.
+Proof.
+  intros; subst; auto.
+Qed.
+
+End congr.
diff --git a/contrib/dp/TODO b/contrib/dp/TODO
index 387cacdf..44349e21 100644
--- a/contrib/dp/TODO
+++ b/contrib/dp/TODO
@@ -21,8 +21,4 @@ TODO
 BUGS
 ----
 
-- value = Some : forall A:Set, A -> option A
-
-  -> eta_expanse échoue sur assert false (ligne 147)
-
 
diff --git a/contrib/dp/dp.ml b/contrib/dp/dp.ml
index 131dd029..79ffaf3f 100644
--- a/contrib/dp/dp.ml
+++ b/contrib/dp/dp.ml
@@ -13,6 +13,8 @@
 
 open Util
 open Pp
+open Libobject
+open Summary
 open Term
 open Tacmach
 open Tactics
@@ -25,12 +27,46 @@ open Coqlib
 open Hipattern
 open Libnames
 open Declarations
+open Dp_why
 
 let debug = ref false
+let set_debug b = debug := b
+let trace = ref false
+let set_trace b = trace := b
+let timeout = ref 10
+let set_timeout n = timeout := n
+
+let (dp_timeout_obj,_) = 
+  declare_object 
+    {(default_object "Dp_timeout") with  
+       cache_function = (fun (_,x) -> set_timeout x);
+       load_function = (fun _ (_,x) -> set_timeout x);
+       export_function = (fun x -> Some x)}
+
+let dp_timeout x = Lib.add_anonymous_leaf (dp_timeout_obj x)
+
+let (dp_debug_obj,_) = 
+  declare_object 
+    {(default_object "Dp_debug") with  
+       cache_function = (fun (_,x) -> set_debug x);
+       load_function = (fun _ (_,x) -> set_debug x);
+       export_function = (fun x -> Some x)}
+
+let dp_debug x = Lib.add_anonymous_leaf (dp_debug_obj x)
+
+let (dp_trace_obj,_) = 
+  declare_object 
+    {(default_object "Dp_trace") with  
+       cache_function = (fun (_,x) -> set_trace x);
+       load_function = (fun _ (_,x) -> set_trace x);
+       export_function = (fun x -> Some x)}
+
+let dp_trace x = Lib.add_anonymous_leaf (dp_trace_obj x)
 
 let logic_dir = ["Coq";"Logic";"Decidable"]
 let coq_modules =
   init_modules @ [logic_dir] @ arith_modules @ zarith_base_modules
+    @ [["Coq"; "ZArith"; "BinInt"]]
     @ [["Coq"; "omega"; "OmegaLemmas"]]
 
 let constant = gen_constant_in_modules "dp" coq_modules
@@ -52,6 +88,7 @@ let coq_Zneg = lazy (constant "Zneg")
 let coq_xH = lazy (constant "xH")
 let coq_xI = lazy (constant "xI")
 let coq_xO = lazy (constant "xO")
+let coq_iff = lazy (constant "iff")
 
 (* not Prop typed expressions *)
 exception NotProp
@@ -104,7 +141,7 @@ let coq_rename_vars env vars =
    type_quantifiers env (A1:Set)...(Ak:Set)t = A1...An, (env+Ai), t *)
 let decomp_type_quantifiers env t =
   let rec loop vars t = match kind_of_term t with
-    | Prod (n, a, t) when is_Set a -> 
+    | Prod (n, a, t) when is_Set a || is_Type a -> 
 	loop ((n,a) :: vars) t
     | _ -> 
 	let vars, env = coq_rename_vars env vars in
@@ -116,7 +153,7 @@ let decomp_type_quantifiers env t =
 (* same thing with lambda binders (for axiomatize body) *)
 let decomp_type_lambdas env t =
   let rec loop vars t = match kind_of_term t with
-    | Lambda (n, a, t) when is_Set a -> 
+    | Lambda (n, a, t) when is_Set a || is_Type a -> 
 	loop ((n,a) :: vars) t
     | _ -> 
 	let vars, env = coq_rename_vars env vars in
@@ -314,7 +351,7 @@ and make_term_abstraction tv env c =
  *)
 and tr_decl env id ty =
   let tv, env, t = decomp_type_quantifiers env ty in
-  if is_Set t then
+  if is_Set t || is_Type t then
     DeclType (id, List.length tv)
   else if is_Prop t then
     DeclPred (id, List.length tv, [])
@@ -329,8 +366,8 @@ and tr_decl env id ty =
 	DeclPred(id, List.length tv, l)
       else 
 	let s = Typing.type_of env Evd.empty t in
-	if is_Set s then 
-	  DeclFun(id, List.length tv, l, tr_type tv env t)
+	if is_Set s || is_Type s then 
+	  DeclFun (id, List.length tv, l, tr_type tv env t)
 	else 
 	  raise NotFO
 
@@ -364,17 +401,18 @@ and axiomatize_body env r id d = match r with
       begin match (Global.lookup_constant c).const_body with
 	| Some b ->
 	    let b = force b in
-	    let tv, env, b = decomp_type_lambdas env b in
 	    let axioms =
 	      (match d with
 		 | DeclPred (id, _, []) ->
+		     let tv, env, b = decomp_type_lambdas env b in
 		     let value = tr_formula tv [] env b in
 		     [id, Iff (Fatom (Pred (id, [])), value)]
 		 | DeclFun (id, _, [], _) ->
+		     let tv, env, b = decomp_type_lambdas env b in
 		     let value = tr_term tv [] env b in
 		     [id, Fatom (Eq (Fol.App (id, []), value))]
 		 | DeclFun (id, _, l, _) | DeclPred (id, _, l) ->
-		     Format.eprintf "axiomatize_body %S@." id;
+		     (*Format.eprintf "axiomatize_body %S@." id;*)
 		     let b = match kind_of_term b with
 		       (* a single recursive function *)
 		       | Fix (_, (_,_,[|b|])) -> 
@@ -391,6 +429,7 @@ and axiomatize_body env r id d = match r with
 		       | _ -> 
 			   b
 		     in
+		     let tv, env, b = decomp_type_lambdas env b in
 		     let vars, t = decompose_lam b in
 		     let n = List.length l in
 		     let k = List.length vars in
@@ -401,21 +440,21 @@ and axiomatize_body env r id d = match r with
 		     let vars = List.rev vars in
 		     let bv = vars in
 		     let vars = List.map (fun x -> string_of_id x) vars in
-		     let fol_var x =
-		       Fol.App (x, []) in
+		     let fol_var x = Fol.App (x, []) in
 		     let fol_vars = List.map fol_var vars in
 		     let vars = List.combine vars l in
 		     begin match d with
-		       | DeclFun _ ->
+		       | DeclFun (_, _, _, ty) ->
 			   begin match kind_of_term t with
 			     | Case (ci, _, e, br) ->
 				 equations_for_case env id vars tv bv ci e br
 			     | _ -> 
-				 let p = 
-				   Fatom (Eq (App (id, fol_vars), 
-					      tr_term tv bv env t)) 
+				 let t = tr_term tv bv env t in
+				 let ax = 
+				   add_proof (Fun_def (id, vars, ty, t))
 				 in
-				 [id, foralls vars p]
+				 let p = Fatom (Eq (App (id, fol_vars), t)) in
+				 [ax, foralls vars p]
 			   end
 		       | DeclPred _ ->
 			   let value = tr_formula tv bv env t in
@@ -436,7 +475,7 @@ and axiomatize_body env r id d = match r with
   | IndRef i ->
       iter_all_constructors i
 	(fun _ c ->
-	   let rc = reference_of_constr c in
+	   let rc = global_of_constr c in
 	   try
 	     begin match tr_global env rc with
 	       | DeclFun (_, _, [], _) -> ()
@@ -453,18 +492,20 @@ and equations_for_case env id vars tv bv ci e br = match kind_of_term e with
       iter_all_constructors ci.ci_ind
 	(fun j cj ->
 	   try
-	     let cjr = reference_of_constr cj in
+	     let cjr = global_of_constr cj in
 	     begin match tr_global env cjr with
 	       | DeclFun (idc, _, l, _) ->
 		   let b = br.(j) in
 		   let rec_vars, b = decompose_lam b in
 		   let rec_vars, env = coq_rename_vars env rec_vars in
-		   let b = substl (List.map mkVar rec_vars) b in
+		   let coq_rec_vars = List.map mkVar rec_vars in
+		   let b = substl coq_rec_vars b in
 		   let rec_vars = List.rev rec_vars in
+		   let coq_rec_term = applist (cj, List.rev coq_rec_vars) in
+		   let b = replace_vars [x, coq_rec_term] b in
 		   let bv = bv @ rec_vars in
 		   let rec_vars = List.map string_of_id rec_vars in
-		   let fol_var x =
-		     Fol.App (x, []) in
+		   let fol_var x = Fol.App (x, []) in
 		   let fol_rec_vars = List.map fol_var rec_vars in
 		   let fol_rec_term = App (idc, fol_rec_vars) in
 		   let rec_vars = List.combine rec_vars l in
@@ -558,7 +599,7 @@ and tr_formula tv bv env f =
 	Fatom (Pred (rename_global (VarRef id), []))
     | _, [t;a;b] when c = build_coq_eq () ->
 	let ty = Typing.type_of env Evd.empty t in
-	if is_Set ty then
+	if is_Set ty || is_Type ty then
 	  let _ = tr_type tv env t in
 	  Fatom (Eq (tr_term tv bv env a, tr_term tv bv env b))
 	else 
@@ -581,6 +622,8 @@ and tr_formula tv bv env f =
 	And (tr_formula tv bv env a, tr_formula tv bv env b)
     | _, [a;b] when c = build_coq_or () ->
 	Or (tr_formula tv bv env a, tr_formula tv bv env b)
+    | _, [a;b] when c = Lazy.force coq_iff ->
+	Iff (tr_formula tv bv env a, tr_formula tv bv env b)
     | Prod (n, a, b), _ ->
 	if is_imp_term f then
 	  Imp (tr_formula tv bv env a, tr_formula tv bv env b)
@@ -632,55 +675,164 @@ let tr_goal gl =
   hyps, c
 
 
-type prover = Simplify | CVCLite | Harvey | Zenon
+type prover = Simplify | Ergo | Yices | CVCLite | Harvey | Zenon | Gwhy
 
 let remove_files = List.iter (fun f -> try Sys.remove f with _ -> ())
 
 let sprintf = Format.sprintf
 
+let file_contents f =
+  let buf = Buffer.create 1024 in
+  try
+    let c = open_in f in
+    begin try 
+      while true do 
+	let s = input_line c in Buffer.add_string buf s; 
+	Buffer.add_char buf '\n'
+      done;
+      assert false
+    with End_of_file ->
+      close_in c;
+      Buffer.contents buf
+    end
+  with _ -> 
+    sprintf "(cannot open %s)" f
+
+let timeout_sys_command cmd =
+  if !debug then Format.eprintf "command line: %s@." cmd;
+  let out = Filename.temp_file "out" "" in
+  let cmd = sprintf "cpulimit %d %s > %s 2>&1" !timeout cmd out in
+  let ret = Sys.command cmd in
+  if !debug then 
+    Format.eprintf "Output file %s:@.%s@." out (file_contents out);
+  ret, out
+
+let timeout_or_failure c cmd out =
+  if c = 152 then 
+    Timeout 
+  else
+    Failure 
+      (sprintf "command %s failed with output:\n%s " cmd (file_contents out))
+
+let prelude_files = ref ([] : string list)
+
+let set_prelude l = prelude_files := l
+
+let (dp_prelude_obj,_) = 
+  declare_object 
+    {(default_object "Dp_prelude") with  
+       cache_function = (fun (_,x) -> set_prelude x);
+       load_function = (fun _ (_,x) -> set_prelude x);
+       export_function = (fun x -> Some x)}
+
+let dp_prelude x = Lib.add_anonymous_leaf (dp_prelude_obj x)
+
+let why_files f = String.concat " " (!prelude_files @ [f])
+
 let call_simplify fwhy =
-  let cmd = sprintf "why --simplify %s" fwhy in
-  if Sys.command cmd <> 0 then error ("Call to " ^ cmd ^ " failed");
+  let cmd = 
+    sprintf "why --no-arrays --simplify --encoding sstrat %s" (why_files fwhy) 
+  in
+  if Sys.command cmd <> 0 then error ("call to " ^ cmd ^ " failed");
   let fsx = Filename.chop_suffix fwhy ".why" ^ "_why.sx" in
   let cmd = 
-    sprintf "timeout 10 Simplify %s > out 2>&1 && grep -q -w Valid out" fsx
+    sprintf "timeout %d Simplify %s > out 2>&1 && grep -q -w Valid out" 
+      !timeout fsx
   in
   let out = Sys.command cmd in
-  let r = if out = 0 then Valid else if out = 1 then Invalid else Timeout in
+  let r = 
+    if out = 0 then Valid None else if out = 1 then Invalid else Timeout 
+  in
   if not !debug then remove_files [fwhy; fsx];
   r
 
+let call_ergo fwhy =
+  let cmd = sprintf "why --no-arrays --why %s" (why_files fwhy) in
+  if Sys.command cmd <> 0 then error ("call to " ^ cmd ^ " failed");
+  let fwhy = Filename.chop_suffix fwhy ".why" ^ "_why.why" in
+  let ftrace = Filename.temp_file "ergo_trace" "" in
+  let cmd = 
+    if !trace then
+      sprintf "ergo -cctrace %s %s" ftrace fwhy
+    else
+      sprintf "ergo %s" fwhy
+  in
+  let ret,out = timeout_sys_command cmd in
+  let r = 
+    if ret <> 0 then 
+      timeout_or_failure ret cmd out
+    else if Sys.command (sprintf "grep -q -w Valid %s" out) = 0 then
+      Valid (if !trace then Some ftrace else None)
+    else if Sys.command (sprintf "grep -q -w \"I don't know\" %s" out) = 0 then
+      DontKnow
+    else if Sys.command (sprintf "grep -q -w \"Invalid\" %s" out) = 0 then
+      Invalid
+    else
+      Failure ("command failed: " ^ cmd)
+  in
+  if not !debug then remove_files [fwhy; out];
+  r
+
 let call_zenon fwhy =
-  let cmd = sprintf "why --no-prelude --no-zenon-prelude --zenon %s" fwhy in
+  let cmd = 
+    sprintf "why --no-prelude --no-zenon-prelude --zenon %s" (why_files fwhy)
+  in
   if Sys.command cmd <> 0 then error ("call to " ^ cmd ^ " failed");
   let fznn = Filename.chop_suffix fwhy ".why" ^ "_why.znn" in
+  let out = Filename.temp_file "dp_out" "" in
   let cmd = 
-    sprintf "timeout 10 zenon %s > out 2>&1 && grep -q PROOF-FOUND out" fznn
+    sprintf "timeout %d zenon -ocoqterm %s > %s 2>&1" !timeout fznn out 
+  in
+  let c = Sys.command cmd in
+  if not !debug then remove_files [fwhy; fznn];
+  if c = 137 then 
+    Timeout
+  else begin
+    if c <> 0 then anomaly ("command failed: " ^ cmd);
+    if Sys.command (sprintf "grep -q -w Error %s" out) = 0 then
+      error "Zenon failed";
+    let c = Sys.command (sprintf "grep -q PROOF-FOUND %s" out) in
+    if c = 0 then Valid (Some out) else Invalid
+  end
+
+let call_yices fwhy =
+  let cmd = 
+    sprintf "why --no-arrays -smtlib --encoding sstrat %s" (why_files fwhy)
+  in
+  if Sys.command cmd <> 0 then error ("call to " ^ cmd ^ " failed");
+  let fsmt = Filename.chop_suffix fwhy ".why" ^ "_why.smt" in
+  let cmd = 
+    sprintf "timeout %d yices -pc 0 -smt < %s > out 2>&1 && grep -q -w unsat out" 
+      !timeout fsmt
   in
   let out = Sys.command cmd in
   let r = 
-    if out = 0 then Valid 
-    else if out = 1 then Invalid 
-    else if out = 137 then Timeout 
-    else anomaly ("malformed Zenon input file " ^ fznn)
+    if out = 0 then Valid None else if out = 1 then Invalid else Timeout 
   in
-  if not !debug then remove_files [fwhy; fznn];
+  if not !debug then remove_files [fwhy; fsmt];
   r
 
 let call_cvcl fwhy =
-  let cmd = sprintf "why --cvcl %s" fwhy in
+  let cmd = 
+    sprintf "why --no-arrays --cvcl --encoding sstrat %s" (why_files fwhy)
+  in
   if Sys.command cmd <> 0 then error ("call to " ^ cmd ^ " failed");
   let fcvc = Filename.chop_suffix fwhy ".why" ^ "_why.cvc" in
   let cmd = 
-    sprintf "timeout 10 cvcl < %s > out 2>&1 && grep -q -w Valid out" fcvc
+    sprintf "timeout %d cvcl < %s > out 2>&1 && grep -q -w Valid out" 
+      !timeout fcvc
   in
   let out = Sys.command cmd in
-  let r = if out = 0 then Valid else if out = 1 then Invalid else Timeout in
+  let r = 
+    if out = 0 then Valid None else if out = 1 then Invalid else Timeout 
+  in
   if not !debug then remove_files [fwhy; fcvc];
   r
 
 let call_harvey fwhy =
-  let cmd = sprintf "why --harvey %s" fwhy in
+  let cmd = 
+    sprintf "why --no-arrays --harvey --encoding strat %s" (why_files fwhy)
+  in
   if Sys.command cmd <> 0 then error ("call to " ^ cmd ^ " failed");
   let frv = Filename.chop_suffix fwhy ".why" ^ "_why.rv" in
   let out = Sys.command (sprintf "rvc -e -t %s > /dev/null 2>&1" frv) in
@@ -688,7 +840,8 @@ let call_harvey fwhy =
   let f = Filename.chop_suffix frv ".rv" ^ "-0.baf" in
   let outf = Filename.temp_file "rv" ".out" in
   let out = 
-    Sys.command (sprintf "timeout 10 rv -e\"-T 2000\" %s > %s 2>&1" f outf) 
+    Sys.command (sprintf "timeout %d rv -e\"-T 2000\" %s > %s 2>&1" 
+		   !timeout f outf) 
   in
   let r =
     if out <> 0 then 
@@ -697,40 +850,69 @@ let call_harvey fwhy =
       let cmd = 
 	sprintf "grep \"Proof obligation in\" %s | grep -q \"is valid\"" outf
       in
-      if Sys.command cmd = 0 then Valid else Invalid
+      if Sys.command cmd = 0 then Valid None else Invalid
   in
   if not !debug then remove_files [fwhy; frv; outf];
   r
 
+let call_gwhy fwhy =
+  let cmd = sprintf "gwhy --no-arrays  %s" (why_files fwhy) in
+  if Sys.command cmd <> 0 then ignore (Sys.command (sprintf "emacs %s" fwhy));
+  NoAnswer
+
+let ergo_proof_from_file f gl =
+  let s =
+    let buf = Buffer.create 1024 in
+    let c = open_in f in
+    try
+      while true do Buffer.add_string buf (input_line c) done; assert false
+    with End_of_file ->
+      close_in c;
+      Buffer.contents buf
+  in
+  let parsed_constr = Pcoq.parse_string Pcoq.Constr.constr s in
+  let t = Constrintern.interp_constr (project gl) (pf_env gl) parsed_constr in
+  exact_check t gl
+
 let call_prover prover q =
   let fwhy = Filename.temp_file "coq_dp" ".why" in
   Dp_why.output_file fwhy q;
-  if !debug then ignore (Sys.command (sprintf "cat %s" fwhy));
   match prover with
     | Simplify -> call_simplify fwhy
+    | Ergo -> call_ergo fwhy
+    | Yices -> call_yices fwhy
     | Zenon -> call_zenon fwhy
     | CVCLite -> call_cvcl fwhy
     | Harvey -> call_harvey fwhy
+    | Gwhy -> call_gwhy fwhy
   
 let dp prover gl =
+  Coqlib.check_required_library ["Coq";"ZArith";"ZArith"];
   let concl_type = pf_type_of gl (pf_concl gl) in
   if not (is_Prop concl_type) then error "Conclusion is not a Prop";
   try 
     let q = tr_goal gl in
     begin match call_prover prover q with
-      | Valid -> Tactics.admit_as_an_axiom gl
+      | Valid (Some f) when prover = Zenon -> Dp_zenon.proof_from_file f gl
+      | Valid (Some f) when prover = Ergo -> ergo_proof_from_file f gl
+      | Valid _ -> Tactics.admit_as_an_axiom gl
       | Invalid -> error "Invalid"
       | DontKnow -> error "Don't know"
       | Timeout -> error "Timeout"
+      | Failure s -> error s
+      | NoAnswer -> Tacticals.tclIDTAC gl
     end
   with NotFO ->
     error "Not a first order goal"
-  
+      
 
 let simplify = tclTHEN intros (dp Simplify)
+let ergo = tclTHEN intros (dp Ergo)
+let yices = tclTHEN intros (dp Yices)
 let cvc_lite = tclTHEN intros (dp CVCLite)
 let harvey = dp Harvey
 let zenon = tclTHEN intros (dp Zenon)
+let gwhy = tclTHEN intros (dp Gwhy)
 
 let dp_hint l =
   let env = Global.env () in
@@ -741,7 +923,8 @@ let dp_hint l =
       if is_Prop s then
 	try
 	  let id = rename_global r in
-	  let d = Axiom (id, tr_formula [] [] env ty) in
+	  let tv, env, ty = decomp_type_quantifiers env ty in
+	  let d = Axiom (id, tr_formula tv [] env ty) in
 	  add_global r (Gfo d);
 	  globals_stack := d :: !globals_stack
 	with NotFO ->
@@ -757,3 +940,52 @@ let dp_hint l =
     end
   in
   List.iter one_hint (List.map (fun qid -> qid, Nametab.global qid) l)
+
+let (dp_hint_obj,_) = 
+  declare_object 
+    {(default_object "Dp_hint") with  
+       cache_function = (fun (_,l) -> dp_hint l);
+       load_function = (fun _ (_,l) -> dp_hint l);
+       export_function = (fun x -> Some x)}
+
+let dp_hint l = Lib.add_anonymous_leaf (dp_hint_obj l)
+
+let dp_predefined qid s =
+  let r = Nametab.global qid in
+  let ty = Global.type_of_global r in
+  let env = Global.env () in
+  let id = rename_global r in
+  try
+    let d = match tr_decl env id ty with
+      | DeclType (_, n) -> DeclType (s, n)
+      | DeclFun (_, n, tyl, ty) -> DeclFun (s, n, tyl, ty)
+      | DeclPred (_, n, tyl) -> DeclPred (s, n, tyl) 
+      | Axiom _ as d -> d
+    in
+    match d with
+      | Axiom _ ->  msg_warning (str " ignored (axiom)")
+      | d -> add_global r (Gfo d)
+  with NotFO ->
+    msg_warning (str " ignored (not a first order declaration)")
+
+let (dp_predefined_obj,_) = 
+  declare_object 
+    {(default_object "Dp_predefined") with  
+       cache_function = (fun (_,(id,s)) -> dp_predefined id s);
+       load_function = (fun _ (_,(id,s)) -> dp_predefined id s);
+       export_function = (fun x -> Some x)}
+
+let dp_predefined id s = Lib.add_anonymous_leaf (dp_predefined_obj (id,s))
+
+let _ = declare_summary "Dp options" 
+	  { freeze_function = 
+	      (fun () -> !debug, !trace, !timeout, !prelude_files);
+	    unfreeze_function = 
+	      (fun (d,tr,tm,pr) -> 
+		debug := d; trace := tr; timeout := tm; prelude_files := pr);
+	    init_function = 
+	      (fun () -> 
+		debug := false; trace := false; timeout := 10; 
+		prelude_files := []);
+	    survive_module = true;
+	    survive_section = true }  
diff --git a/contrib/dp/dp.mli b/contrib/dp/dp.mli
index 3dad469c..6dbc05e1 100644
--- a/contrib/dp/dp.mli
+++ b/contrib/dp/dp.mli
@@ -3,10 +3,18 @@ open Libnames
 open Proof_type
 
 val simplify : tactic
+val ergo : tactic
+val yices : tactic
 val cvc_lite : tactic
 val harvey : tactic
 val zenon : tactic
+val gwhy : tactic
 
 val dp_hint : reference list -> unit
+val dp_timeout : int -> unit
+val dp_debug : bool -> unit
+val dp_trace : bool -> unit
+val dp_prelude : string list -> unit
+val dp_predefined : reference -> string -> unit
 
 
diff --git a/contrib/dp/dp_cvcl.ml b/contrib/dp/dp_cvcl.ml
deleted file mode 100644
index 05d43081..00000000
--- a/contrib/dp/dp_cvcl.ml
+++ /dev/null
@@ -1,112 +0,0 @@
-
-open Format
-open Fol
-
-let rec print_list sep print fmt = function
-  | [] -> ()
-  | [x] -> print fmt x
-  | x :: r -> print fmt x; sep fmt (); print_list sep print fmt r
-
-let space fmt () = fprintf fmt "@ "
-let comma fmt () = fprintf fmt ",@ "
-
-let rec print_term fmt = function
-  | Cst n -> 
-      fprintf fmt "%d" n
-  | Plus (a, b) ->
-      fprintf fmt "@[(%a@ +@ %a)@]" print_term a print_term b
-  | Moins (a, b) ->
-      fprintf fmt "@[(%a@ -@ %a)@]" print_term a print_term b
-  | Mult (a, b) ->
-      fprintf fmt "@[(%a@ *@ %a)@]" print_term a print_term b
-  | Div (a, b) ->
-      fprintf fmt "@[(%a@ /@ %a)@]" print_term a print_term b
-  | App (id, []) ->
-      fprintf fmt "@[%s@]" id
-  | App (id, tl) ->
-      fprintf fmt "@[%s(%a)@]" id print_terms tl
-
-and print_terms fmt tl = 
-  print_list comma print_term fmt tl
-
-let rec print_predicate fmt p = 
-  let pp = print_predicate in 
-  match p with
-  | True ->
-      fprintf fmt "TRUE"
-  | False ->
-      fprintf fmt "FALSE"
-  | Fatom (Eq (a, b)) ->
-      fprintf fmt "@[(%a = %a)@]" print_term a print_term b
-  | Fatom (Le (a, b)) ->
-      fprintf fmt "@[(%a@ <= %a)@]" print_term a print_term b
-  | Fatom (Lt (a, b))->
-      fprintf fmt "@[(%a@ < %a)@]" print_term a print_term b
-  | Fatom (Ge (a, b)) ->
-      fprintf fmt "@[(%a@ >= %a)@]" print_term a print_term b
-  | Fatom (Gt (a, b)) ->
-      fprintf fmt "@[(%a@ > %a)@]" print_term a print_term b
-  | Fatom (Pred (id, [])) ->
-      fprintf fmt "@[%s@]" id
-  | Fatom (Pred (id, tl)) ->
-      fprintf fmt "@[%s(%a)@]" id print_terms tl
-  | Imp (a, b) ->
-      fprintf fmt "@[(%a@ => %a)@]" pp a pp b
-  | And (a, b) ->
-      fprintf fmt "@[(%a@ AND@ %a)@]" pp a pp b
-  | Or (a, b) ->
-      fprintf fmt "@[(%a@ OR@ %a)@]" pp a pp b
-  | Not a ->
-      fprintf fmt "@[(NOT@ %a)@]" pp a
-  | Forall (id, t, p) -> 
-      fprintf fmt "@[(FORALL (%s:%s): %a)@]" id t pp p
-  | Exists (id, t, p) -> 
-      fprintf fmt "@[(EXISTS (%s:%s): %a)@]" id t pp p
-
-let rec string_of_type_list  = function
-  | [] -> assert false
-  | [e] -> e
-  | e :: l' -> e ^ ", " ^ (string_of_type_list l')
-
-let print_query fmt (decls,concl) =
-  let print_decl = function
-    | DeclVar (id, [], t) ->
-	fprintf fmt "@[%s: %s;@]@\n" id t
-    | DeclVar (id, [e], t) ->
-	fprintf fmt "@[%s: [%s -> %s];@]@\n"
-	  id e t
-    | DeclVar (id, l, t) ->
-	fprintf fmt "@[%s: [[%s] -> %s];@]@\n"
-	  id (string_of_type_list l) t
-    | DeclPred (id, []) ->
-	fprintf fmt "@[%s: BOOLEAN;@]@\n" id
-     | DeclPred (id, [e]) ->
-	fprintf fmt "@[%s: [%s -> BOOLEAN];@]@\n"
-	  id e
-   | DeclPred (id, l) ->
-	fprintf fmt "@[%s: [[%s] -> BOOLEAN];@]@\n"
-	  id (string_of_type_list l)
-    | DeclType id ->
-	fprintf fmt "@[%s: TYPE;@]@\n" id
-    | Assert (id, f)  -> 
-	fprintf fmt "@[ASSERT %% %s@\n %a;@]@\n" id print_predicate f
-  in
-  List.iter print_decl decls;
-  fprintf fmt "QUERY %a;" print_predicate concl
-
-let call q = 
-  let f = Filename.temp_file "coq_dp" ".cvc" in
-  let c = open_out f in
-  let fmt = formatter_of_out_channel c in
-  fprintf fmt "@[%a@]@." print_query q;
-  close_out c;
-  ignore (Sys.command (sprintf "cat %s" f));
-  let cmd = 
-    sprintf "timeout 10 cvcl < %s > out 2>&1 && grep -q -w Valid out" f
-  in
-  prerr_endline cmd; flush stderr;
-  let out = Sys.command cmd in
-  if out = 0 then Valid else if out = 1 then Invalid else Timeout
-  (* TODO: effacer le fichier f et le fichier out *)
-
-
diff --git a/contrib/dp/dp_cvcl.mli b/contrib/dp/dp_cvcl.mli
deleted file mode 100644
index 03b6d347..00000000
--- a/contrib/dp/dp_cvcl.mli
+++ /dev/null
@@ -1,4 +0,0 @@
-
-open Fol
-
-val call : query -> prover_answer
diff --git a/contrib/dp/dp_gappa.ml b/contrib/dp/dp_gappa.ml
new file mode 100644
index 00000000..70439a97
--- /dev/null
+++ b/contrib/dp/dp_gappa.ml
@@ -0,0 +1,445 @@
+
+open Format
+open Util
+open Pp
+open Term
+open Tacmach
+open Tactics
+open Tacticals
+open Names
+open Nameops
+open Termops
+open Coqlib
+open Hipattern
+open Libnames
+open Declarations
+open Evarutil
+
+let debug = ref false
+
+(* 1. gappa syntax trees and output *)
+
+module Constant = struct
+
+  open Bigint
+
+  type t = { mantissa : bigint; base : int; exp : bigint }
+
+  let create (b, m, e) =
+    { mantissa = m; base = b; exp = e }
+
+  let of_int x = 
+    { mantissa = x; base = 1; exp = zero }
+
+  let print fmt x = match x.base with
+    | 1 -> fprintf fmt "%s" (to_string x.mantissa)
+    | 2 -> fprintf fmt "%sb%s" (to_string x.mantissa) (to_string x.exp)
+    | 10 -> fprintf fmt "%se%s" (to_string x.mantissa) (to_string x.exp)
+    | _ -> assert false
+
+end
+
+type binop = Bminus | Bplus | Bmult | Bdiv
+
+type unop = Usqrt | Uabs | Uopp
+
+type rounding_mode = string
+
+type term =
+  | Tconst of Constant.t
+  | Tvar of string
+  | Tbinop of binop * term * term
+  | Tunop of unop * term
+  | Tround of rounding_mode * term
+
+type pred =
+  | Pin of term * Constant.t * Constant.t
+
+let rec print_term fmt = function
+  | Tconst c -> Constant.print fmt c
+  | Tvar s -> pp_print_string fmt s
+  | Tbinop (op, t1, t2) -> 
+      let op = match op with 
+	| Bplus -> "+" | Bminus -> "-" | Bmult -> "*" | Bdiv -> "/"
+      in
+      fprintf fmt "(%a %s %a)" print_term t1 op print_term t2
+  | Tunop (Uabs, t) ->
+      fprintf fmt "|%a|" print_term t
+  | Tunop (Uopp | Usqrt as op, t) ->
+      let s = match op with 
+	| Uopp -> "-" | Usqrt -> "sqrt" | _ -> assert false 
+      in
+      fprintf fmt "(%s(%a))" s print_term t
+  | Tround (m, t) ->
+      fprintf fmt "(%s(%a))" m print_term t
+
+let print_pred fmt = function
+  | Pin (t, c1, c2) -> 
+      fprintf fmt "%a in [%a, %a]" 
+	print_term t Constant.print c1 Constant.print c2
+
+let temp_file f = if !debug then f else Filename.temp_file f ".v"
+let remove_file f = if not !debug then try Sys.remove f with _ -> ()
+
+let read_gappa_proof f =
+  let buf = Buffer.create 1024 in
+  Buffer.add_char buf '(';
+  let cin = open_in f in
+  let rec skip_space () =
+    let c = input_char cin in if c = ' ' then skip_space () else c
+  in
+  while input_char cin <> '=' do () done;
+  try
+    while true do
+      let c = skip_space () in
+      if c = ':' then raise Exit;
+      Buffer.add_char buf c;
+      let s = input_line cin in
+      Buffer.add_string buf s; 
+      Buffer.add_char buf '\n';
+    done;
+    assert false
+  with Exit ->
+    close_in cin;
+    remove_file f;
+    Buffer.add_char buf ')';
+    Buffer.contents buf
+
+exception GappaFailed
+exception GappaProofFailed
+
+let patch_gappa_proof fin fout =
+  let cin = open_in fin in
+  let cout = open_out fout in
+  let fmt = formatter_of_out_channel cout in
+  let last = ref "" in
+  let defs = ref "" in
+  try
+    while true do
+      let s = input_line cin in
+      if s = "Qed." then
+	fprintf fmt "Defined.@\n"
+      else begin
+	begin 
+	  try Scanf.sscanf s "Lemma %s " 
+	    (fun n -> defs := n ^ " " ^ !defs; last := n)
+	  with Scanf.Scan_failure _ ->
+	    try Scanf.sscanf s "Definition %s " 
+	      (fun n -> defs := n ^ " " ^ !defs)
+	    with Scanf.Scan_failure _ ->
+	      ()
+	end;
+	fprintf fmt "%s@\n" s
+      end
+    done
+  with End_of_file ->
+    close_in cin;
+    fprintf fmt "Definition proof := Eval cbv delta [%s] in %s.@." !defs !last;
+    close_out cout
+    
+let call_gappa hl p =
+  let gappa_in = temp_file "gappa_input" in
+  let c = open_out gappa_in in
+  let fmt = formatter_of_out_channel c in
+  fprintf fmt "@[{ "; 
+  List.iter (fun h -> fprintf fmt "%a ->@ " print_pred h) hl;
+  fprintf fmt "%a }@]@." print_pred p;
+  close_out c;
+  let gappa_out = temp_file "gappa_output" in
+  let cmd = sprintf "gappa -Bcoq < %s > %s 2> /dev/null" gappa_in gappa_out in
+  let out = Sys.command cmd in
+  if out <> 0 then raise GappaFailed;
+  remove_file gappa_in;
+  let gappa_out2 = temp_file "gappa2" in
+  patch_gappa_proof gappa_out gappa_out2;
+  remove_file gappa_out;
+  let cmd = sprintf "%s/coqc %s" Coq_config.bindir gappa_out2 in
+  let out = Sys.command cmd in
+  if out <> 0 then raise GappaProofFailed;
+  let gappa_out3 = temp_file "gappa3" in
+  let c = open_out gappa_out3 in
+  let gappa2 = Filename.chop_suffix (Filename.basename gappa_out2) ".v" in
+  Printf.fprintf c 
+    "Require \"%s\". Set Printing Depth 9999999. Print %s.proof." 
+    (Filename.chop_suffix gappa_out2 ".v") gappa2;
+  close_out c;
+  let lambda = temp_file "gappa_lambda" in
+  let cmd = sprintf "%s/coqc %s > %s" Coq_config.bindir gappa_out3 lambda in
+  let out = Sys.command cmd in
+  if out <> 0 then raise GappaProofFailed;
+  remove_file gappa_out2; remove_file gappa_out3;
+  remove_file (gappa_out2 ^ "o"); remove_file (gappa_out3 ^ "o");
+  read_gappa_proof lambda
+
+(* 2. coq -> gappa translation *)
+
+exception NotGappa
+
+let logic_dir = ["Coq";"Logic";"Decidable"]
+let coq_modules =
+  init_modules @ [logic_dir] @ arith_modules @ zarith_base_modules
+    @ [["Coq"; "ZArith"; "BinInt"];
+       ["Coq"; "Reals"; "Rdefinitions"]; 
+       ["Coq"; "Reals"; "Raxioms";];
+       ["Coq"; "Reals"; "Rbasic_fun";];
+       ["Coq"; "Reals"; "R_sqrt";];
+       ["Coq"; "Reals"; "Rfunctions";];
+       ["Gappa"; "Gappa_tactic";];
+       ["Gappa"; "Gappa_fixed";];
+       ["Gappa"; "Gappa_float";];
+       ["Gappa"; "Gappa_round_def";];
+       ["Gappa"; "Gappa_pred_bnd";];  
+       ["Gappa"; "Gappa_definitions";];
+  ]
+
+let constant = gen_constant_in_modules "gappa" coq_modules
+
+let coq_refl_equal = lazy (constant "refl_equal")
+let coq_Rle = lazy (constant "Rle")
+let coq_R = lazy (constant "R")
+(*
+let coq_Rplus = lazy (constant "Rplus")
+let coq_Rminus = lazy (constant "Rminus")
+let coq_Rmult = lazy (constant "Rmult")
+let coq_Rdiv = lazy (constant "Rdiv")
+let coq_powerRZ = lazy (constant "powerRZ")
+let coq_R1 = lazy (constant "R1")
+let coq_Ropp = lazy (constant "Ropp")
+let coq_Rabs = lazy (constant "Rabs")
+let coq_sqrt = lazy (constant "sqrt")
+*)
+
+let coq_convert = lazy (constant "convert")
+let coq_reUnknown = lazy (constant "reUnknown")
+let coq_reFloat2 = lazy (constant "reFloat2")
+let coq_reFloat10 = lazy (constant "reFloat10")
+let coq_reInteger = lazy (constant "reInteger")
+let coq_reBinary = lazy (constant "reBinary")
+let coq_reUnary = lazy (constant "reUnary")
+let coq_reRound = lazy (constant "reRound")
+let coq_roundDN = lazy (constant "roundDN")
+let coq_roundUP = lazy (constant "roundUP")
+let coq_roundNE = lazy (constant "roundNE")
+let coq_roundZR = lazy (constant "roundZR")
+let coq_rounding_fixed = lazy (constant "rounding_fixed")
+let coq_rounding_float = lazy (constant "rounding_float")
+let coq_boAdd = lazy (constant "boAdd")
+let coq_boSub = lazy (constant "boSub")
+let coq_boMul = lazy (constant "boMul")
+let coq_boDiv = lazy (constant "boDiv")
+let coq_uoAbs = lazy (constant "uoAbs")
+let coq_uoNeg = lazy (constant "uoNeg")
+let coq_uoSqrt = lazy (constant "uoSqrt")
+let coq_subset = lazy (constant "subset")
+let coq_makepairF = lazy (constant "makepairF")
+
+let coq_true = lazy (constant "true")
+let coq_false = lazy (constant "false")
+
+let coq_Z0 = lazy (constant "Z0")
+let coq_Zpos = lazy (constant "Zpos")
+let coq_Zneg = lazy (constant "Zneg")
+let coq_xH = lazy (constant "xH")
+let coq_xI = lazy (constant "xI")
+let coq_xO = lazy (constant "xO")
+let coq_IZR = lazy (constant "IZR")
+
+(* translates a closed Coq term p:positive into a FOL term of type int *)
+let rec tr_positive p = match kind_of_term p with
+  | Term.Construct _ when p = Lazy.force coq_xH ->
+      1
+  | Term.App (f, [|a|]) when f = Lazy.force coq_xI ->
+      2 * (tr_positive a) + 1
+  | Term.App (f, [|a|]) when f = Lazy.force coq_xO ->
+      2 * (tr_positive a)
+  | Term.Cast (p, _, _) ->
+      tr_positive p
+  | _ ->
+      raise NotGappa
+
+(* translates a closed Coq term t:Z into a term of type int *)
+let rec tr_arith_constant t = match kind_of_term t with
+  | Term.Construct _ when t = Lazy.force coq_Z0 -> 0
+  | Term.App (f, [|a|]) when f = Lazy.force coq_Zpos -> tr_positive a
+  | Term.App (f, [|a|]) when f = Lazy.force coq_Zneg -> - (tr_positive a)
+  | Term.Cast (t, _, _) -> tr_arith_constant t
+  | _ -> raise NotGappa
+
+(* translates a closed Coq term p:positive into a FOL term of type bigint *)
+let rec tr_bigpositive p = match kind_of_term p with
+  | Term.Construct _ when p = Lazy.force coq_xH -> 
+      Bigint.one
+  | Term.App (f, [|a|]) when f = Lazy.force coq_xI ->
+      Bigint.add_1 (Bigint.mult_2 (tr_bigpositive a))
+  | Term.App (f, [|a|]) when f = Lazy.force coq_xO ->
+      (Bigint.mult_2 (tr_bigpositive a))
+  | Term.Cast (p, _, _) ->
+      tr_bigpositive p
+  | _ ->
+      raise NotGappa
+
+(* translates a closed Coq term t:Z into a term of type bigint *)
+let rec tr_arith_bigconstant t = match kind_of_term t with
+  | Term.Construct _ when t = Lazy.force coq_Z0 -> Bigint.zero
+  | Term.App (f, [|a|]) when f = Lazy.force coq_Zpos -> tr_bigpositive a
+  | Term.App (f, [|a|]) when f = Lazy.force coq_Zneg -> 
+      Bigint.neg (tr_bigpositive a)
+  | Term.Cast (t, _, _) -> tr_arith_bigconstant t
+  | _ -> raise NotGappa
+
+let decomp c = 
+  let c, args = decompose_app c in
+  kind_of_term c, args
+
+let tr_bool c = match decompose_app c with
+  | c, [] when c = Lazy.force coq_true -> true
+  | c, [] when c = Lazy.force coq_false -> false
+  | _ -> raise NotGappa
+
+let tr_float b m e =
+  (b, tr_arith_bigconstant m, tr_arith_bigconstant e)
+
+let tr_binop c = match decompose_app c with
+  | c, [] when c = Lazy.force coq_boAdd -> Bplus
+  | c, [] when c = Lazy.force coq_boSub -> Bminus
+  | c, [] when c = Lazy.force coq_boMul -> Bmult
+  | c, [] when c = Lazy.force coq_boDiv -> Bdiv
+  | _ -> assert false
+
+let tr_unop c = match decompose_app c with
+  | c, [] when c = Lazy.force coq_uoNeg -> Uopp
+  | c, [] when c = Lazy.force coq_uoSqrt -> Usqrt
+  | c, [] when c = Lazy.force coq_uoAbs -> Uabs
+  | _ -> raise NotGappa
+
+let tr_var c = match decomp c with
+  | Var x, [] -> string_of_id x
+  | _ -> assert false
+
+let tr_mode c = match decompose_app c with
+  | c, [] when c = Lazy.force coq_roundDN -> "dn"
+  | c, [] when c = Lazy.force coq_roundNE -> "ne"
+  | c, [] when c = Lazy.force coq_roundUP -> "up"
+  | c, [] when c = Lazy.force coq_roundZR -> "zr"
+  | _ -> raise NotGappa
+
+let tr_rounding_mode c = match decompose_app c with
+  | c, [a;b] when c = Lazy.force coq_rounding_fixed ->
+      let a = tr_mode a in
+      let b = tr_arith_constant b in
+      sprintf "fixed<%d,%s>" b a
+  | c, [a;p;e] when c = Lazy.force coq_rounding_float ->
+      let a = tr_mode a in
+      let p = tr_positive p in
+      let e = tr_arith_constant e in
+      sprintf "float<%d,%d,%s>" p (-e) a
+  | _ ->
+      raise NotGappa
+
+(* REexpr -> term *)
+let rec tr_term c0 = 
+  let c, args = decompose_app c0 in
+  match kind_of_term c, args with
+    | _, [a] when c = Lazy.force coq_reUnknown ->
+	Tvar (tr_var a)
+    | _, [a; b] when c = Lazy.force coq_reFloat2 ->
+	Tconst (Constant.create (tr_float 2 a b))
+    | _, [a; b] when c = Lazy.force coq_reFloat10 ->
+	Tconst (Constant.create (tr_float 10 a b))
+    | _, [a] when c = Lazy.force coq_reInteger ->
+	Tconst (Constant.create (1, tr_arith_bigconstant a, Bigint.zero))
+    | _, [op;a;b] when c = Lazy.force coq_reBinary ->
+	Tbinop (tr_binop op, tr_term a, tr_term b)
+    | _, [op;a] when c = Lazy.force coq_reUnary ->
+	Tunop (tr_unop op, tr_term a)
+    | _, [op;a] when c = Lazy.force coq_reRound ->
+	Tround (tr_rounding_mode op, tr_term a)
+    | _ -> 
+	msgnl (str "tr_term: " ++ Printer.pr_constr c0); 
+	assert false
+
+let tr_rle c = 
+  let c, args = decompose_app c in
+  match kind_of_term c, args with
+    | _, [a;b] when c = Lazy.force coq_Rle ->  
+	begin match decompose_app a, decompose_app b with
+	  | (ac, [at]), (bc, [bt]) 
+	    when ac = Lazy.force coq_convert && bc = Lazy.force coq_convert ->
+	      at, bt
+	  | _ ->
+	      raise NotGappa
+	end
+    | _ -> 
+	raise NotGappa
+
+let tr_pred c =
+  let c, args = decompose_app c in
+  match kind_of_term c, args with
+    | _, [a;b] when c = build_coq_and () ->
+	begin match tr_rle a, tr_rle b with
+	  | (c1, t1), (t2, c2) when t1 = t2 -> 
+	      begin match tr_term c1, tr_term c2 with
+		| Tconst c1, Tconst c2 ->
+		    Pin (tr_term t1, c1, c2)
+		| _ -> 
+		    raise NotGappa
+	      end
+	  | _ -> 
+	      raise NotGappa
+	end
+    | _ -> 
+	raise NotGappa
+
+let is_R c = match decompose_app c with
+  | c, [] when c = Lazy.force coq_R -> true
+  | _ -> false
+
+let tr_hyps =
+  List.fold_left 
+    (fun acc (_,h) -> try tr_pred h :: acc with NotGappa -> acc) []
+
+let constr_of_string gl s = 
+  let parse_constr = Pcoq.parse_string Pcoq.Constr.constr in
+  Constrintern.interp_constr (project gl) (pf_env gl) (parse_constr s)
+
+let var_name = function
+  | Name id -> 
+      let s = string_of_id id in
+      let s = String.sub s 1 (String.length s - 1) in
+      mkVar (id_of_string s)
+  | Anonymous -> 
+       assert false
+
+let build_proof_term c0 =
+  let bl,c = decompose_lam c0 in
+  List.fold_right 
+    (fun (x,t) pf -> 
+      mkApp (pf, [| if is_R t then var_name x else mk_new_meta () |]))
+    bl c0
+
+let gappa_internal gl =
+  try
+    let c = tr_pred (pf_concl gl) in
+    let s = call_gappa (tr_hyps (pf_hyps_types gl)) c in
+    let pf = constr_of_string gl s in
+    let pf = build_proof_term pf in
+    Tacticals.tclTHEN (Tacmach.refine_no_check pf) Tactics.assumption gl
+  with 
+    | NotGappa -> error "not a gappa goal"
+    | GappaFailed -> error "gappa failed"
+    | GappaProofFailed -> error "incorrect gappa proof term"
+
+let gappa_prepare =
+  let id = Ident (dummy_loc, id_of_string "gappa_prepare") in
+  lazy (Tacinterp.interp (Tacexpr.TacArg (Tacexpr.Reference id)))
+
+let gappa gl =
+  Coqlib.check_required_library ["Gappa"; "Gappa_tactic"];
+  Tacticals.tclTHEN (Lazy.force gappa_prepare) gappa_internal gl
+
+(*
+Local Variables: 
+compile-command: "make -C ../.. bin/coqc.opt bin/coqide.opt"
+End: 
+*)
+
diff --git a/contrib/dp/dp_simplify.ml b/contrib/dp/dp_simplify.ml
deleted file mode 100644
index d5376b8d..00000000
--- a/contrib/dp/dp_simplify.ml
+++ /dev/null
@@ -1,117 +0,0 @@
-
-open Format
-open Fol
-
-let is_simplify_ident s =
-  let is_simplify_char = function
-    | 'a'..'z' | 'A'..'Z' | '0'..'9' -> true 
-    | _ -> false
-  in
-  try 
-    String.iter (fun c -> if not (is_simplify_char c) then raise Exit) s; true
-  with Exit ->
-    false
-
-let ident fmt s =
-  if is_simplify_ident s then fprintf fmt "%s" s else fprintf fmt "|%s|" s
-
-let rec print_list sep print fmt = function
-  | [] -> ()
-  | [x] -> print fmt x
-  | x :: r -> print fmt x; sep fmt (); print_list sep print fmt r
-
-let space fmt () = fprintf fmt "@ "
-let comma fmt () = fprintf fmt ",@ "
-
-let rec print_term fmt = function
-  | Cst n -> 
-      fprintf fmt "%d" n
-  | Plus (a, b) ->
-      fprintf fmt "@[(+@ %a@ %a)@]" print_term a print_term b
-  | Moins (a, b) ->
-      fprintf fmt "@[(-@ %a@ %a)@]" print_term a print_term b
-  | Mult (a, b) ->
-      fprintf fmt "@[(*@ %a@ %a)@]" print_term a print_term b
-  | Div (a, b) ->
-      fprintf fmt "@[(/@ %a@ %a)@]" print_term a print_term b
-  | App (id, []) ->
-      fprintf fmt "%a" ident id
-  | App (id, tl) ->
-      fprintf fmt "@[(%a@ %a)@]" ident id print_terms tl
-
-and print_terms fmt tl = 
-  print_list space print_term fmt tl
-
-let rec print_predicate fmt p = 
-  let pp = print_predicate in 
-  match p with
-  | True ->
-      fprintf fmt "TRUE"
-  | False ->
-      fprintf fmt "FALSE"
-  | Fatom (Eq (a, b)) ->
-      fprintf fmt "@[(EQ %a@ %a)@]" print_term a print_term b
-  | Fatom (Le (a, b)) ->
-      fprintf fmt "@[(<= %a@ %a)@]" print_term a print_term b
-  | Fatom (Lt (a, b))->
-      fprintf fmt "@[(< %a@ %a)@]" print_term a print_term b
-  | Fatom (Ge (a, b)) ->
-      fprintf fmt "@[(>= %a@ %a)@]" print_term a print_term b
-  | Fatom (Gt (a, b)) ->
-      fprintf fmt "@[(> %a@ %a)@]" print_term a print_term b
-  | Fatom (Pred (id, tl)) -> 
-      fprintf fmt "@[(EQ (%a@ %a) |@@true|)@]" ident id print_terms tl
-  | Imp (a, b) ->
-      fprintf fmt "@[(IMPLIES@ %a@ %a)@]" pp a pp b
-  | And (a, b) ->
-      fprintf fmt "@[(AND@ %a@ %a)@]" pp a pp b
-  | Or (a, b) ->
-      fprintf fmt "@[(OR@ %a@ %a)@]" pp a pp b
-  | Not a ->
-      fprintf fmt "@[(NOT@ %a)@]" pp a
-  | Forall (id, _, p) -> 
-      fprintf fmt "@[(FORALL (%a)@ %a)@]" ident id pp p
-  | Exists (id, _, p) -> 
-      fprintf fmt "@[(EXISTS (%a)@ %a)@]" ident id pp p
-
-(**
-let rec string_list l = match l with
-    [] -> ""
-  | [e] -> e
-  | e::l' -> e ^ " " ^ (string_list l')
-**)
-
-let print_query fmt (decls,concl) =
-  let print_decl = function
-    | DeclVar (id, [], t) ->
-	fprintf fmt "@[;; %s : %s@]@\n"	id t
-    | DeclVar (id, l, t) ->
-	fprintf fmt "@[;; %s : %a -> %s@]@\n" 
-	  id (print_list comma pp_print_string) l t
-    | DeclPred (id, []) ->
-	fprintf fmt "@[;; %s : BOOLEAN @]@\n" id
-    | DeclPred (id, l) -> 
-	fprintf fmt "@[;; %s : %a -> BOOLEAN@]@\n" 
-	  id (print_list comma pp_print_string) l
-    | DeclType id ->
-	fprintf fmt "@[;; %s : TYPE@]@\n" id
-    | Assert (id, f)  -> 
-	fprintf fmt "@[(BG_PUSH ;; %s@\n %a)@]@\n" id print_predicate f
-  in
-  List.iter print_decl decls;
-  fprintf fmt "%a@." print_predicate concl
-
-let call q = 
-  let f = Filename.temp_file "coq_dp" ".sx" in
-  let c = open_out f in
-  let fmt = formatter_of_out_channel c in
-  fprintf fmt "@[%a@]@." print_query q;
-  close_out c;
-  ignore (Sys.command (sprintf "cat %s" f));
-  let cmd = 
-    sprintf "timeout 10 Simplify %s > out 2>&1 && grep -q -w Valid out" f
-  in
-  prerr_endline cmd; flush stderr;
-  let out = Sys.command cmd in
-  if out = 0 then Valid else if out = 1 then Invalid else Timeout
-  (* TODO: effacer le fichier f et le fichier out *)
diff --git a/contrib/dp/dp_simplify.mli b/contrib/dp/dp_simplify.mli
deleted file mode 100644
index 03b6d347..00000000
--- a/contrib/dp/dp_simplify.mli
+++ /dev/null
@@ -1,4 +0,0 @@
-
-open Fol
-
-val call : query -> prover_answer
diff --git a/contrib/dp/dp_sorts.ml b/contrib/dp/dp_sorts.ml
deleted file mode 100644
index 7dbdfa56..00000000
--- a/contrib/dp/dp_sorts.ml
+++ /dev/null
@@ -1,51 +0,0 @@
-
-open Fol
-
-let term_has_sort x s = Fatom (Pred ("%sort_" ^ s, [x]))
-
-let has_sort x s = term_has_sort (App (x, [])) s
-
-let rec form = function
-  | True | False | Fatom _ as f -> f
-  | Imp (f1, f2) -> Imp (form f1, form f2)
-  | And (f1, f2) -> And (form f1, form f2)
-  | Or (f1, f2) -> Or (form f1, form f2)
-  | Not f -> Not (form f)
-  | Forall (x, ("INT" as t), f) -> Forall (x, t, form f)
-  | Forall (x, t, f) -> Forall (x, t, Imp (has_sort x t, form f))
-  | Exists (x, ("INT" as t), f) -> Exists (x, t, form f)
-  | Exists (x, t, f) -> Exists (x, t, Imp (has_sort x t, form f))
-
-let sort_ax = let r = ref 0 in fun () -> incr r; "sort_ax_" ^ string_of_int !r
-
-let hyp acc = function
-  | Assert (id, f) -> 
-      (Assert (id, form f)) :: acc
-  | DeclVar (id, _, "INT") as d ->
-      d :: acc
-  | DeclVar (id, [], t) as d -> 
-      (Assert (sort_ax (), has_sort id t)) :: d :: acc
-  | DeclVar (id, l, t) as d -> 
-      let n = ref 0 in
-      let xi = 
-	List.fold_left 
-	  (fun l t -> incr n; ("x" ^ string_of_int !n, t) :: l) [] l
-      in
-      let f =
-	List.fold_left
-	  (fun f (x,t) -> if t = "INT" then f else Imp (has_sort x t, f))
-	  (term_has_sort 
-	     (App (id, List.rev_map (fun (x,_) -> App (x,[])) xi)) t)
-	  xi 
-      in
-      let f = List.fold_left (fun f (x,t) -> Forall (x, t, f)) f xi in
-      (Assert (sort_ax (), f)) :: d :: acc
-  | DeclPred _ as d ->
-      d :: acc
-  | DeclType t as d ->
-      (DeclPred ("%sort_" ^ t, [t])) :: d :: acc
-
-let query (hyps, f) =
-  let hyps' = List.fold_left hyp [] hyps in
-  List.rev hyps', form f
-
diff --git a/contrib/dp/dp_sorts.mli b/contrib/dp/dp_sorts.mli
deleted file mode 100644
index 9e74f997..00000000
--- a/contrib/dp/dp_sorts.mli
+++ /dev/null
@@ -1,4 +0,0 @@
-
-open Fol
-
-val query : query -> query
diff --git a/contrib/dp/dp_why.ml b/contrib/dp/dp_why.ml
index e1ddb039..e24049ad 100644
--- a/contrib/dp/dp_why.ml
+++ b/contrib/dp/dp_why.ml
@@ -4,6 +4,18 @@
 open Format
 open Fol
 
+type proof = 
+  | Immediate of Term.constr
+  | Fun_def of string * (string * typ) list * typ * term
+
+let proofs = Hashtbl.create 97
+let proof_name = 
+  let r = ref 0 in fun () -> incr r; "dp_axiom__" ^ string_of_int !r
+
+let add_proof pr = let n = proof_name () in Hashtbl.add proofs n pr; n
+
+let find_proof = Hashtbl.find proofs
+
 let rec print_list sep print fmt = function
   | [] -> ()
   | [x] -> print fmt x
diff --git a/contrib/dp/dp_why.mli b/contrib/dp/dp_why.mli
new file mode 100644
index 00000000..b38a3d37
--- /dev/null
+++ b/contrib/dp/dp_why.mli
@@ -0,0 +1,17 @@
+
+open Fol
+
+(* generation of the Why file *)
+
+val output_file : string -> query -> unit
+
+(* table to translate the proofs back to Coq (used in dp_zenon) *)
+
+type proof = 
+  | Immediate of Term.constr
+  | Fun_def of string * (string * typ) list * typ * term
+
+val add_proof : proof -> string
+val find_proof : string -> proof
+
+
diff --git a/contrib/dp/dp_zenon.ml b/contrib/dp/dp_zenon.ml
deleted file mode 100644
index 57b0a44f..00000000
--- a/contrib/dp/dp_zenon.ml
+++ /dev/null
@@ -1,103 +0,0 @@
-
-open Format
-open Fol
-
-let rec print_list sep print fmt = function
-  | [] -> ()
-  | [x] -> print fmt x
-  | x :: r -> print fmt x; sep fmt (); print_list sep print fmt r
-
-let space fmt () = fprintf fmt "@ "
-
-let rec print_term fmt = function
-  | Cst n -> 
-      fprintf fmt "%d" n
-  | Plus (a, b) ->
-      fprintf fmt "@[(+@ %a@ %a)@]" print_term a print_term b
-  | Moins (a, b) ->
-      fprintf fmt "@[(-@ %a@ %a)@]" print_term a print_term b
-  | Mult (a, b) ->
-      fprintf fmt "@[(*@ %a@ %a)@]" print_term a print_term b
-  | Div (a, b) ->
-      fprintf fmt "@[(/@ %a@ %a)@]" print_term a print_term b
-  | App (id, []) ->
-      fprintf fmt "%s" id 
-  | App (id, tl) ->
-      fprintf fmt "@[(%s@ %a)@]" id print_terms tl
-
-and print_terms fmt tl = 
-  print_list space print_term fmt tl
-
-let rec print_predicate fmt p = 
-  let pp = print_predicate in 
-  match p with
-  | True ->
-      fprintf fmt "True"
-  | False ->
-      fprintf fmt "False"
-  | Fatom (Eq (a, b)) ->
-      fprintf fmt "@[(= %a@ %a)@]" print_term a print_term b
-  | Fatom (Le (a, b)) ->
-      fprintf fmt "@[(<= %a@ %a)@]" print_term a print_term b
-  | Fatom (Lt (a, b))->
-      fprintf fmt "@[(< %a@ %a)@]" print_term a print_term b
-  | Fatom (Ge (a, b)) ->
-      fprintf fmt "@[(>= %a@ %a)@]" print_term a print_term b
-  | Fatom (Gt (a, b)) ->
-      fprintf fmt "@[(> %a@ %a)@]" print_term a print_term b
-  | Fatom (Pred (id, tl)) -> 
-      fprintf fmt "@[(%s@ %a)@]" id print_terms tl
-  | Imp (a, b) ->
-      fprintf fmt "@[(=>@ %a@ %a)@]" pp a pp b
-  | And (a, b) ->
-      fprintf fmt "@[(/\\@ %a@ %a)@]" pp a pp b
-  | Or (a, b) ->
-      fprintf fmt "@[(\\/@ %a@ %a)@]" pp a pp b
-  | Not a ->
-      fprintf fmt "@[(-.@ %a)@]" pp a
-  | Forall (id, t, p) -> 
-      fprintf fmt "@[(A. ((%s \"%s\")@ %a))@]" id t pp p
-  | Exists (id, t, p) -> 
-      fprintf fmt "@[(E. ((%s \"%s\")@ %a))@]" id t pp p
-
-let rec string_of_type_list  = function
-  | [] -> ""
-  | e :: l' -> e ^ " -> " ^ (string_of_type_list l')
-
-let print_query fmt (decls,concl) =
-  let print_decl = function
-    | DeclVar (id, [], t) ->
-	fprintf fmt "@[;; %s: %s@]@\n" id t
-    | DeclVar (id, l, t) ->
-	fprintf fmt "@[;; %s: %s%s@]@\n"
-	  id (string_of_type_list l) t
-    | DeclPred (id, l) -> 
-	fprintf fmt "@[;; %s: %sBOOLEAN@]@\n"
-	  id (string_of_type_list l)
-    | DeclType id ->
-	fprintf fmt "@[;; %s: TYPE@]@\n" id
-    | Assert (id, f)  -> 
-	fprintf fmt "@[\"%s\" %a@]@\n" id print_predicate f
-  in
-  List.iter print_decl decls;
-  fprintf fmt "$goal %a@." print_predicate concl
-
-let call q = 
-  let f = Filename.temp_file "coq_dp" ".znn" in
-  let c = open_out f in
-  let fmt = formatter_of_out_channel c in
-  fprintf fmt "@[%a@]@." print_query q;
-  close_out c;
-  ignore (Sys.command (sprintf "cat %s" f));
-  let cmd = 
-    sprintf "timeout 10 zenon %s > out 2>&1 && grep -q PROOF-FOUND out" f
-  in
-  prerr_endline cmd; flush stderr;
-  let out = Sys.command cmd in
-  if out = 0 then Valid 
-  else if out = 1 then Invalid 
-  else if out = 137 then Timeout
-  else Util.anomaly "malformed Zenon input file"
-  (* TODO: effacer le fichier f et le fichier out *)
-
-
diff --git a/contrib/dp/dp_zenon.mli b/contrib/dp/dp_zenon.mli
index 03b6d347..0a727d1f 100644
--- a/contrib/dp/dp_zenon.mli
+++ b/contrib/dp/dp_zenon.mli
@@ -1,4 +1,7 @@
 
 open Fol
 
-val call : query -> prover_answer
+val set_debug : bool -> unit
+
+val proof_from_file : string -> Proof_type.tactic
+
diff --git a/contrib/dp/dp_zenon.mll b/contrib/dp/dp_zenon.mll
new file mode 100644
index 00000000..2fc2a5f4
--- /dev/null
+++ b/contrib/dp/dp_zenon.mll
@@ -0,0 +1,181 @@
+
+{
+
+  open Lexing 
+  open Pp
+  open Util
+  open Names
+  open Tacmach
+  open Dp_why
+  open Tactics
+  open Tacticals
+
+  let debug = ref false
+  let set_debug b = debug := b
+  
+  let buf = Buffer.create 1024
+    
+  let string_of_global env ref =
+    Libnames.string_of_qualid (Nametab.shortest_qualid_of_global env ref)
+
+  let axioms = ref []
+
+  (* we cannot interpret the terms as we read them (since some lemmas
+     may need other lemmas to be already interpreted) *)
+  type lemma = { l_id : string; l_type : string; l_proof : string }
+  type zenon_proof = lemma list * string
+
+}
+
+let ident = ['a'-'z' 'A'-'Z' '_' '0'-'9' '\'']+
+let space = [' ' '\t' '\r']
+
+rule start = parse
+| "(* BEGIN-PROOF *)" "\n" { scan lexbuf }
+| _ { start lexbuf }
+| eof { anomaly "malformed Zenon proof term" }
+
+(* here we read the lemmas and the main proof term;
+   meanwhile we maintain the set of axioms that were used *)
+
+and scan = parse
+| "Let" space (ident as id) space* ":"
+  { let t = read_coq_term lexbuf in
+    let p = read_lemma_proof lexbuf in
+    let l,pr = scan lexbuf in
+    { l_id = id; l_type = t; l_proof = p } :: l, pr }
+| "Definition theorem:"
+  { let t = read_main_proof lexbuf in [], t }
+| _ | eof
+  { anomaly "malformed Zenon proof term" }
+
+and read_coq_term = parse
+| "." "\n" 
+  { let s = Buffer.contents buf in Buffer.clear buf; s }
+| "coq__" (ident as id) (* a Why keyword renamed *)
+  { Buffer.add_string buf id; read_coq_term lexbuf }
+| ("dp_axiom__" ['0'-'9']+) as id 
+  { axioms := id :: !axioms; Buffer.add_string buf id; read_coq_term lexbuf }
+| _ as c 
+  { Buffer.add_char buf c; read_coq_term lexbuf }
+| eof 
+  { anomaly "malformed Zenon proof term" }
+
+and read_lemma_proof = parse
+| "Proof" space
+  { read_coq_term lexbuf }
+| _ | eof
+  { anomaly "malformed Zenon proof term" }
+
+(* skip the main proof statement and then read its term *)
+and read_main_proof = parse
+| ":=" "\n"
+  { read_coq_term lexbuf }
+| _ 
+  { read_main_proof lexbuf }
+| eof
+  { anomaly "malformed Zenon proof term" }
+
+
+{
+
+  let read_zenon_proof f =
+    Buffer.clear buf;
+    let c = open_in f in
+    let lb = from_channel c in
+    let p = start lb in
+    close_in c;
+    if not !debug then begin try Sys.remove f with _ -> () end;
+    p
+
+  let constr_of_string gl s = 
+    let parse_constr = Pcoq.parse_string Pcoq.Constr.constr in
+    Constrintern.interp_constr (project gl) (pf_env gl) (parse_constr s)
+
+  (* we are lazy here: we build strings containing Coq terms using a *)
+  (* pretty-printer Fol -> Coq *)
+  module Coq = struct
+    open Format
+    open Fol
+
+    let rec print_list sep print fmt = function
+      | [] -> ()
+      | [x] -> print fmt x
+      | x :: r -> print fmt x; sep fmt (); print_list sep print fmt r
+	  
+    let space fmt () = fprintf fmt "@ "
+    let comma fmt () = fprintf fmt ",@ "
+
+    let rec print_typ fmt = function
+      | Tvar x -> fprintf fmt "%s" x
+      | Tid ("int", []) -> fprintf fmt "Z"
+      | Tid (x, []) -> fprintf fmt "%s" x
+      | Tid (x, [t]) -> fprintf fmt "(%s %a)" x print_typ t 
+      | Tid (x,tl) -> 
+	  fprintf fmt "(%s %a)" x (print_list comma print_typ) tl 
+	  
+    let rec print_term fmt = function
+      | Cst n -> 
+	  fprintf fmt "%d" n
+      | Plus (a, b) ->
+	  fprintf fmt "@[(Zplus %a %a)@]" print_term a print_term b
+      | Moins (a, b) ->
+	  fprintf fmt "@[(Zminus %a %a)@]" print_term a print_term b
+      | Mult (a, b) ->
+	  fprintf fmt "@[(Zmult %a %a)@]" print_term a print_term b
+      | Div (a, b) ->
+	  fprintf fmt "@[(Zdiv %a %a)@]" print_term a print_term b
+      | App (id, []) ->
+	  fprintf fmt "%s" id
+      | App (id, tl) ->
+	  fprintf fmt "@[(%s %a)@]" id print_terms tl
+
+    and print_terms fmt tl = 
+      print_list space print_term fmt tl
+
+    (* builds the text for "forall vars, f vars = t" *)
+    let fun_def_axiom f vars t =
+      let binder fmt (x,t) = fprintf fmt "(%s: %a)" x print_typ t in
+      fprintf str_formatter
+	"@[(forall %a, %s %a = %a)@]@."
+	(print_list space binder) vars f 
+	(print_list space (fun fmt (x,_) -> pp_print_string fmt x)) vars
+	print_term t;
+      flush_str_formatter ()
+			   
+  end
+
+  let prove_axiom id = match Dp_why.find_proof id with
+    | Immediate t -> 
+	exact_check t
+    | Fun_def (f, vars, ty, t) -> 
+	tclTHENS
+	  (fun gl ->
+	     let s = Coq.fun_def_axiom f vars t in
+	     if !debug then Format.eprintf "axiom fun def = %s@." s;
+	     let c = constr_of_string gl s in
+	     assert_tac true (Name (id_of_string id)) c gl)
+	  [tclTHEN intros reflexivity; tclIDTAC]
+
+  let exact_string s gl =
+    let c = constr_of_string gl s in
+    exact_check c gl
+
+  let interp_zenon_proof (ll,p) =
+    let interp_lemma l gl =
+      let ty = constr_of_string gl l.l_type in
+      tclTHENS
+	(assert_tac true (Name (id_of_string l.l_id)) ty)
+	[exact_string l.l_proof; tclIDTAC]
+	gl
+    in
+    tclTHEN (tclMAP interp_lemma ll) (exact_string p)
+
+  let proof_from_file f =
+    axioms := [];
+    msgnl (str "proof_from_file " ++ str f);
+    let zp = read_zenon_proof f in
+    msgnl (str "proof term is " ++ str (snd zp));
+    tclTHEN (tclMAP prove_axiom !axioms) (interp_zenon_proof zp)
+
+}
diff --git a/contrib/dp/fol.mli b/contrib/dp/fol.mli
index a85469cc..b94bd3e3 100644
--- a/contrib/dp/fol.mli
+++ b/contrib/dp/fol.mli
@@ -45,4 +45,11 @@ type query = decl list * form
 
 (* prover result *)
 
-type prover_answer = Valid | Invalid | DontKnow | Timeout
+type prover_answer = 
+  | Valid of string option 
+  | Invalid
+  | DontKnow
+  | Timeout
+  | NoAnswer
+  | Failure of string
+
diff --git a/contrib/dp/g_dp.ml4 b/contrib/dp/g_dp.ml4
index eb7fb73b..99bcf477 100644
--- a/contrib/dp/g_dp.ml4
+++ b/contrib/dp/g_dp.ml4
@@ -8,7 +8,7 @@
 
 (*i camlp4deps: "parsing/grammar.cma" i*)
 
-(* $Id: g_dp.ml4 7165 2005-06-24 12:56:46Z coq $ *)
+(* $Id: g_dp.ml4 10924 2008-05-13 14:01:11Z filliatr $ *)
 
 open Dp
 
@@ -16,6 +16,14 @@ TACTIC EXTEND Simplify
   [ "simplify" ] -> [ simplify ]
 END
 
+TACTIC EXTEND Ergo
+  [ "ergo" ] -> [ ergo ]
+END
+
+TACTIC EXTEND Yices
+  [ "yices" ] -> [ yices ]
+END
+
 TACTIC EXTEND CVCLite
   [ "cvcl" ] -> [ cvc_lite ]
 END
@@ -28,6 +36,18 @@ TACTIC EXTEND Zenon
   [ "zenon" ] -> [ zenon ]
 END
 
+TACTIC EXTEND Gwhy
+  [ "gwhy" ] -> [ gwhy ]
+END
+
+TACTIC EXTEND Gappa_internal
+  [ "gappa_internal" ] -> [ Dp_gappa.gappa_internal ]
+END
+
+TACTIC EXTEND Gappa
+  [ "gappa" ] -> [ Dp_gappa.gappa ]
+END
+
 (* should be part of basic tactics syntax *)
 TACTIC EXTEND admit
   [ "admit"    ] -> [ Tactics.admit_as_an_axiom ]
@@ -36,3 +56,24 @@ END
 VERNAC COMMAND EXTEND Dp_hint 
   [ "Dp_hint" ne_global_list(l) ] -> [ dp_hint l ]
 END
+
+VERNAC COMMAND EXTEND Dp_timeout
+| [ "Dp_timeout" natural(n) ] -> [ dp_timeout n ]
+END
+
+VERNAC COMMAND EXTEND Dp_prelude
+| [ "Dp_prelude" string_list(l) ] -> [ dp_prelude l ]
+END
+
+VERNAC COMMAND EXTEND Dp_predefined
+| [ "Dp_predefined" global(g) "=>" string(s) ] -> [ dp_predefined g s ]
+END
+
+VERNAC COMMAND EXTEND Dp_debug
+| [ "Dp_debug" ] -> [ dp_debug true; Dp_zenon.set_debug true ]
+END
+
+VERNAC COMMAND EXTEND Dp_trace
+| [ "Dp_trace" ] -> [ dp_trace true ]
+END
+
diff --git a/contrib/dp/test2.v b/contrib/dp/test2.v
index 4e933a3c..3e4c0f6d 100644
--- a/contrib/dp/test2.v
+++ b/contrib/dp/test2.v
@@ -5,6 +5,10 @@ Require Import List.
 Open Scope list_scope.
 Open Scope Z_scope.
 
+Dp_debug.
+Dp_timeout 3.
+Require Export zenon.
+
 Definition neg (z:Z) : Z := match z with
   | Z0 => Z0
   | Zpos p => Zneg p
@@ -18,9 +22,7 @@ Open Scope nat_scope.
 Print plus.
 
 Goal forall x, x+0=x.
-  induction x.
-  zenon.
-  zenon.
+  induction x; ergo.
   (* simplify resoud le premier, pas le second *)
   Admitted.
 
diff --git a/contrib/dp/test_gappa.v b/contrib/dp/test_gappa.v
new file mode 100644
index 00000000..eb65a59d
--- /dev/null
+++ b/contrib/dp/test_gappa.v
@@ -0,0 +1,91 @@
+Require Export Gappa_tactic.
+Require Export Reals.
+
+Open Scope Z_scope.
+Open Scope R_scope.
+
+Lemma test_base10 : 
+  forall x y:R,
+  0 <= x <= 4 -> 
+  0 <= x * (24 * powerRZ 10 (-1)) <= 10.
+Proof.
+  gappa.
+Qed.
+
+(*
+@rnd = float< ieee_32, zr >;
+a = rnd(a_); b = rnd(b_);
+{ a in [3.2,3.3] /\ b in [1.4,1.9] ->
+  rnd(a - b) - (a - b) in [0,0] }
+*)
+
+Definition rnd := gappa_rounding (rounding_float roundZR 43 (120)).
+
+Lemma test_float3 :
+  forall a_ b_ a b : R,
+  a = rnd a_ ->
+  b = rnd b_ ->
+  52 / 16 <= a <= 53 / 16 ->
+  22 / 16 <= b <= 30 / 16 ->
+  0 <= rnd (a - b) - (a - b) <= 0.
+Proof.
+  unfold rnd.
+  gappa.
+Qed.
+
+Lemma test_float2 :
+  forall x y:R,
+  0 <= x <= 1 ->
+  0 <= y <= 1 ->
+  0 <= gappa_rounding (rounding_float roundNE 53 (1074)) (x+y) <= 2. 
+Proof.
+  gappa.
+Qed.
+
+Lemma test_float1 :
+  forall x y:R,
+  0 <= gappa_rounding (rounding_fixed roundDN (0)) x -
+           gappa_rounding (rounding_fixed roundDN (0)) y <= 0 ->
+  Rabs (x - y) <= 1.
+Proof.
+  gappa.
+Qed.
+
+Lemma test1 : 
+  forall x y:R,
+  0 <= x <= 1 -> 
+  0 <= -y <= 1 ->  
+  0 <= x  * (-y) <= 1.
+Proof.
+  gappa.
+Qed.
+
+Lemma test2 : 
+  forall x y:R,
+  3/4 <= x <= 3 -> 
+  0 <= sqrt x <= 1775 * (powerRZ 2 (-10)).
+Proof.
+  gappa.
+Qed.
+
+Lemma test3 : 
+  forall x y z:R,
+  0 <= x - y <= 3 -> 
+  -2 <= y - z <= 4 ->
+  -2 <= x - z <= 7.
+Proof.
+  gappa.
+Qed.
+
+Lemma test4 : 
+  forall x1 x2 y1 y2 : R,
+  1 <= Rabs y1 <= 1000 ->
+  1 <= Rabs y2 <= 1000 ->
+  - powerRZ 2 (-53) <= (x1 - y1) / y1 <= powerRZ 2 (-53) ->
+  - powerRZ 2 (-53) <= (x2 - y2) / y2 <= powerRZ 2 (-53) ->
+  - powerRZ 2 (-51) <= (x1 * x2 - y1 * y2) / (y1 * y2) <= powerRZ 2 (-51).
+Proof.
+  gappa.
+Qed.
+
+
diff --git a/contrib/dp/tests.v b/contrib/dp/tests.v
index 52a57a0c..a6d4f2e1 100644
--- a/contrib/dp/tests.v
+++ b/contrib/dp/tests.v
@@ -2,48 +2,115 @@
 Require Import ZArith.
 Require Import Classical.
 
+Dp_debug.
+Dp_timeout 3.
+
+(* module renamings *)
+
+Module M.
+  Parameter t : Set.
+End M.
+
+Lemma test_module_0 : forall x:M.t, x=x.
+ergo.
+Qed.
+
+Module N := M.
+
+Lemma test_module_renaming_0 : forall x:N.t, x=x.
+ergo.
+Qed.
+
+Dp_predefined M.t => "int".
+
+Lemma test_module_renaming_1 : forall x:N.t, x=x.
+ergo.
+Qed.
+
+(* Coq lists *)
+
+Require Export List.
+
+Lemma test_pol_0 : forall l:list nat, l=l.
+ergo.
+Qed.
+
+Parameter nlist: list nat -> Prop.
+
+Lemma poly_1 : forall l,  nlist l -> True.
+intros. 
+simplify.
+Qed.
+
+(* user lists *)
+
+Inductive list (A:Set) : Set :=
+| nil : list A
+| cons: forall a:A, list A -> list A.
+
+Fixpoint app (A:Set) (l m:list A) {struct l} : list A :=
+match l with
+| nil => m
+| cons a l1 => cons A a (app A l1 m)
+end.
+
+Lemma entail: (nil Z) = app Z (nil Z) (nil Z) -> True. 
+intros; ergo. 
+Qed.
+
+(* polymorphism *)
+Require Import List.
+
+Inductive mylist (A:Set) : Set :=
+  mynil : mylist A
+| mycons : forall a:A, mylist A -> mylist A.
+
+Parameter my_nlist: mylist nat -> Prop.
+
+ Goal forall l,  my_nlist l -> True.
+ intros.
+ simplify. 
+Qed.
+
 (* First example with the 0 and the equality translated *)
 
 Goal 0 = 0.
-zenon.
+simplify.
 Qed.
 
-
 (* Examples in the Propositional Calculus
    and theory of equality *)
 
 Parameter A C : Prop.
 
 Goal A -> A.
-zenon.
+simplify.
 Qed.
 
 
 Goal A -> (A \/ C).
 
-zenon.
+simplify.
 Qed.
 
 
 Parameter x y z : Z.
 
 Goal x = y -> y = z -> x = z.
-
-zenon.
+ergo.
 Qed.
 
 
 Goal ((((A -> C) -> A) -> A) -> C) -> C.
 
-zenon.
+ergo.
 Qed.
 
-
 (* Arithmetic *)
 Open Scope Z_scope.
 
 Goal 1 + 1 = 2.
-simplify.
+yices.
 Qed.
 
 
@@ -57,14 +124,12 @@ Qed.
 
 Goal (forall (x y : Z), x = y) -> 0=1.
 try zenon.
-simplify.
+ergo.
 Qed.
 
 Goal forall (x: nat), (x + 0 = x)%nat.
 
-induction x0.
-zenon.
-zenon.
+induction x0; ergo.
 Qed.
 
 
@@ -106,7 +171,7 @@ Inductive even : Z -> Prop :=
    unlike CVC Lite *)
 
 Goal even 4.
-cvcl.
+ergo.
 Qed.
 
 
@@ -115,8 +180,7 @@ Definition skip_z (z : Z) (n : nat) := n.
 Definition skip_z1 := skip_z.
 
 Goal forall (z : Z) (n : nat), skip_z z n = skip_z1 z n.
-
-zenon.
+yices.
 Qed.
 
 
@@ -133,8 +197,7 @@ Dp_hint add_S.
    unlike zenon *)
 
 Goal forall n : nat, add n 0 = n.
-
-induction n ; zenon.
+induction n ; yices.
 Qed.
 
 
@@ -144,8 +207,8 @@ Definition pred (n : nat) : nat := match n with
 end.
 
 Goal forall n : nat, n <> 0%nat -> pred (S n) <> 0%nat.
-
-zenon.
+yices.
+(*zenon.*)
 Qed.
 
 
@@ -157,7 +220,7 @@ end.
 
 Goal forall n : nat, plus n 0%nat = n.
 
-induction n; zenon.
+induction n; ergo.
 Qed.
 
 
@@ -173,8 +236,11 @@ with odd_b (n : nat) : bool := match n with
 end.
 
 Goal even_b (S (S O)) = true.
-
+ergo.
+(*
+simplify.
 zenon.
+*)
 Qed.
 
 
@@ -184,7 +250,8 @@ Parameter foo : Set.
 Parameter ff : nat -> foo -> foo -> nat.
 Parameter g : foo -> foo.
 Goal (forall x:foo, ff 0 x x = O) -> forall y, ff 0 (g y) (g y) = O.
-zenon.
+yices.
+(*zenon.*)
 Qed.
 
 
@@ -194,7 +261,8 @@ Qed.
 Parameter poly_f : forall A:Set, A->A.
 
 Goal forall x:nat, poly_f nat x = poly_f nat x.
-zenon.
+ergo.
+(*zenon.*)
 Qed.
 
 
diff --git a/contrib/dp/zenon.v b/contrib/dp/zenon.v
new file mode 100644
index 00000000..4ad00a11
--- /dev/null
+++ b/contrib/dp/zenon.v
@@ -0,0 +1,94 @@
+(*  Copyright 2004 INRIA  *)
+(*  $Id: zenon.v 10739 2008-04-01 14:45:20Z herbelin $  *)
+
+Require Export Classical.
+
+Lemma zenon_nottrue :
+  (~True -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_noteq : forall (T : Type) (t : T),
+  ((t <> t) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_and : forall P Q : Prop,
+  (P -> Q -> False) -> (P /\ Q -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_or : forall P Q : Prop,
+  (P -> False) -> (Q -> False) -> (P \/ Q -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_imply : forall P Q : Prop,
+  (~P -> False) -> (Q -> False) -> ((P -> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_equiv : forall P Q : Prop,
+  (~P -> ~Q -> False) -> (P -> Q -> False) -> ((P <-> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notand : forall P Q : Prop,
+  (~P -> False) -> (~Q -> False) -> (~(P /\ Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notor : forall P Q : Prop,
+  (~P -> ~Q -> False) -> (~(P \/ Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notimply : forall P Q : Prop,
+  (P -> ~Q -> False) -> (~(P -> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_notequiv : forall P Q : Prop,
+  (~P -> Q -> False) -> (P -> ~Q -> False) -> (~(P <-> Q) -> False).
+Proof. tauto. Qed.
+
+Lemma zenon_ex : forall (T : Type) (P : T -> Prop),
+  (forall z : T, ((P z) -> False)) -> ((exists x : T, (P x)) -> False).
+Proof. firstorder. Qed.
+
+Lemma zenon_all : forall (T : Type) (P : T -> Prop) (t : T),
+  ((P t) -> False) -> ((forall x : T, (P x)) -> False).
+Proof. firstorder. Qed.
+
+Lemma zenon_notex : forall (T : Type) (P : T -> Prop) (t : T),
+  (~(P t) -> False) -> (~(exists x : T, (P x)) -> False).
+Proof. firstorder. Qed.
+
+Lemma zenon_notall : forall (T : Type) (P : T -> Prop),
+  (forall z : T, (~(P z) -> False)) -> (~(forall x : T, (P x)) -> False).
+Proof. intros T P Ha Hb. apply Hb. intro. apply NNPP. exact (Ha x). Qed.
+
+Lemma zenon_equal_base : forall (T : Type) (f : T), f = f.
+Proof. auto. Qed.
+
+Lemma zenon_equal_step :
+  forall (S T : Type) (fa fb : S -> T) (a b : S),
+  (fa = fb) -> (a <> b -> False) -> ((fa a) = (fb b)).
+Proof. intros. rewrite (NNPP (a = b)). congruence. auto. Qed.
+
+Lemma zenon_pnotp : forall P Q : Prop,
+  (P = Q) -> (P -> ~Q -> False).
+Proof. intros P Q Ha. rewrite Ha. auto. Qed.
+
+Lemma zenon_notequal : forall (T : Type) (a b : T),
+  (a = b) -> (a <> b -> False).
+Proof. auto. Qed.
+
+Ltac zenon_intro id :=
+  intro id || let nid := fresh in (intro nid; clear nid)
+.
+
+Definition zenon_and_s := fun P Q a b => zenon_and P Q b a.
+Definition zenon_or_s := fun P Q a b c => zenon_or P Q b c a.
+Definition zenon_imply_s := fun P Q a b c => zenon_imply P Q b c a.
+Definition zenon_equiv_s := fun P Q a b c => zenon_equiv P Q b c a.
+Definition zenon_notand_s := fun P Q a b c => zenon_notand P Q b c a.
+Definition zenon_notor_s := fun P Q a b => zenon_notor P Q b a.
+Definition zenon_notimply_s := fun P Q a b => zenon_notimply P Q b a.
+Definition zenon_notequiv_s := fun P Q a b c => zenon_notequiv P Q b c a.
+Definition zenon_ex_s := fun T P a b => zenon_ex T P b a.
+Definition zenon_notall_s := fun T P a b => zenon_notall T P b a.
+
+Definition zenon_pnotp_s := fun P Q a b c => zenon_pnotp P Q c a b.
+Definition zenon_notequal_s := fun T a b x y => zenon_notequal T a b y x.