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+(************************************************************************)
+(*  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        *)
+(************************************************************************)
+
+(* $Id: global.ml,v 1.43.2.1 2004/07/16 19:30:35 herbelin Exp $ *)
+
+open Util
+open Names
+open Term
+open Sign
+open Environ
+open Safe_typing
+open Summary
+
+(* We introduce here the global environment of the system, and we declare it
+   as a synchronized table. *)
+
+let global_env = ref empty_environment
+
+let safe_env () = !global_env
+
+let env () = env_of_safe_env !global_env
+
+let _ = 
+  declare_summary "Global environment"
+    { freeze_function = (fun () -> !global_env);
+      unfreeze_function = (fun fr -> global_env := fr);
+      init_function = (fun () -> global_env := empty_environment);
+      survive_module = true;
+      survive_section = false }
+
+(* Then we export the functions of [Typing] on that environment. *)
+
+let universes () = universes (env())
+let named_context () = named_context (env())
+
+let push_named_assum a =
+  let (cst,env) = push_named_assum a !global_env in
+  global_env := env;
+  cst
+let push_named_def d =
+  let (cst,env) = push_named_def d !global_env in
+  global_env := env;
+  cst
+
+(*let add_thing add kn thing =
+  let _,dir,l = repr_kn kn in
+  let kn',newenv = add dir l thing !global_env in
+    if kn = kn' then
+      global_env := newenv
+    else
+      anomaly "Kernel names do not match."
+*)
+
+let add_thing add dir id thing = 
+  let kn, newenv = add dir (label_of_id id) thing !global_env in
+    global_env := newenv;
+    kn
+
+let add_constant = add_thing add_constant 
+let add_mind = add_thing add_mind
+let add_modtype = add_thing (fun _ -> add_modtype) ()
+let add_module = add_thing (fun _ -> add_module) ()
+
+let add_constraints c = global_env := add_constraints c !global_env
+
+let set_engagement c = global_env := set_engagement c !global_env
+
+let start_module id params mtyo =
+  let l = label_of_id id in
+  let mp,newenv = start_module l params mtyo !global_env in
+    global_env := newenv;
+    mp
+  
+let end_module id =
+  let l = label_of_id id in
+  let mp,newenv = end_module l !global_env in
+    global_env := newenv;
+    mp
+
+
+let start_modtype id params = 
+  let l = label_of_id id in
+  let mp,newenv = start_modtype l params !global_env in
+    global_env := newenv;
+    mp
+
+let end_modtype id =
+  let l = label_of_id id in
+  let kn,newenv = end_modtype l !global_env in
+    global_env := newenv;
+    kn
+
+
+
+
+let lookup_named id = lookup_named id (env())
+let lookup_constant kn = lookup_constant kn (env())
+let lookup_inductive ind = Inductive.lookup_mind_specif (env()) ind
+let lookup_mind kn = lookup_mind kn (env())
+
+let lookup_module mp = lookup_module mp (env())
+let lookup_modtype kn = lookup_modtype kn (env())
+
+
+
+
+let start_library dir = 
+  let mp,newenv = start_library dir !global_env in
+    global_env := newenv; 
+    mp
+
+let export s = snd (export !global_env s)
+
+let import cenv digest = 
+  let mp,newenv = import cenv digest !global_env in 
+    global_env := newenv; 
+    mp
+
+
+
+(*s Function to get an environment from the constants part of the global
+    environment and a given context. *)
+
+let env_of_context hyps = 
+  reset_with_named_context hyps (env())
+
+open Libnames
+
+let type_of_reference env = function
+  | VarRef id -> let (_,_,t) = Environ.lookup_named id env in t
+  | ConstRef c -> Environ.constant_type env c
+  | IndRef ind -> Inductive.type_of_inductive env ind
+  | ConstructRef cstr -> Inductive.type_of_constructor env cstr
+
+let type_of_global t = type_of_reference (env ()) t
+
+
+(*let get_kn dp l = 
+  make_kn (current_modpath !global_env) dp l
+*)