This big commit addresses two problems:

  1- Management of the name-space in a modular development / sharing of non-logical objects.
  2- Performance of atomic module operations (adding a module to the environment, subtyping ...).

1-
There are 3 module constructions which derive equalities on fields from a module to another:
Let P be a module path and foo a field of P

Module M := P.

Module M.
 Include P.
 ...
End M.

Declare Module K : S with Module M := P.

In this 3 cases we don't want to be bothered by the duplication of names. 
Of course, M.foo delta reduce to P.foo but many non-logical features of coq 
do not work modulo conversion (they use eq_constr or constr_pat object). 
To engender a transparent name-space (ie using P.foo or M.foo is the same thing) 
we quotient the name-space by the equivalence relation on names induced by the 
3 constructions above.
To implement this, the types constant and mutual_inductive are now couples of 
kernel_names. The first projection correspond to the name used by the user and the second
projection to the canonical name, for example the internal name of M.foo is
(M.foo,P.foo). 
So:
*************************************************************************************
*  Use the eq_(con,mind,constructor,gr,egr...) function and not = on names values   *
*************************************************************************************

Map and Set indexed on names are ordered on user name for the kernel side
and on canonical name outside. Thus we have sharing of notation, hints... for free 
(also for a posteriori declaration of them, ex: a notation on M.foo will be 
avaible on P.foo). If you want to use this, use the appropriate compare function
defined in name.ml or libnames.ml.


2-
No more time explosion (i hoppe) when using modules i have re-implemented atomic
module operations so that they are all linear in the size of the module. We also
have no more unique identifier (internal module names) for modules, it is now based 
on a section_path like mechanism => we have less substitutions to perform at require,
module closing and subtyping but we pre-compute more information hence if we instanciate 
several functors then we have bigger vo.


Last thing, the checker will not work well on vo(s) that contains one of the 3 constructions
above, i will work on it soon...



git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12406 85f007b7-540e-0410-9357-904b9bb8a0f7

1 files changed, 14 insertions, 2 deletions

diff --git a/library/heads.ml b/library/heads.ml
index 150ba8942..056f78a5f 100644
--- a/library/heads.ml
+++ b/library/heads.ml
@@ -39,8 +39,20 @@ type head_approximation =
 
 (** Registration as global tables and rollback. *)
 
+module Evalreford = struct
+  type t = evaluable_global_reference
+  let compare x y = 
+     let make_name = function
+      | EvalConstRef con -> 
+	  EvalConstRef(constant_of_kn(canonical_con con))
+      | k -> k
+     in 
+       Pervasives.compare (make_name x) (make_name y)
+end
+
 module Evalrefmap =
-  Map.Make (struct type t = evaluable_global_reference let compare = compare end)
+  Map.Make (Evalreford)
+
 
 let head_map = ref Evalrefmap.empty
 
@@ -144,7 +156,7 @@ let subst_head_approximation subst = function
         kind_of_head (Global.env()) c
   | x -> x
 
-let subst_head (_,subst,(ref,k)) =
+let subst_head (subst,(ref,k)) =
   (subst_evaluable_reference subst ref, subst_head_approximation subst k)
 
 let discharge_head (_,(ref,k)) =