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, 12 insertions, 3 deletions

diff --git a/library/libnames.mli b/library/libnames.mli
index 43ca252c1..fd2ca37ae 100644
--- a/library/libnames.mli
+++ b/library/libnames.mli
@@ -28,11 +28,14 @@ val isConstRef : global_reference -> bool
 val isIndRef : global_reference -> bool
 val isConstructRef : global_reference -> bool
 
+val eq_gr : global_reference -> global_reference -> bool
+
 val destVarRef : global_reference -> variable
 val destConstRef : global_reference -> constant
 val destIndRef : global_reference -> inductive
 val destConstructRef : global_reference -> constructor
 
+
 val subst_constructor : substitution -> constructor -> constructor * constr
 val subst_global : substitution -> global_reference -> global_reference * constr
 
@@ -47,6 +50,12 @@ val global_of_constr : constr -> global_reference
 val constr_of_reference : global_reference -> constr
 val reference_of_constr : constr -> global_reference
 
+module RefOrdered : sig
+  type t = global_reference
+  val compare : global_reference -> global_reference -> int
+end
+  
+
 module Refset : Set.S with type elt = global_reference
 module Refmap : Map.S with type key = global_reference
 
@@ -108,8 +117,8 @@ val restrict_path : int -> full_path -> full_path
 
 (*s Temporary function to brutally form kernel names from section paths *)
 
-val encode_kn : dir_path -> identifier -> kernel_name
-val decode_kn : kernel_name -> dir_path * identifier
+val encode_mind : dir_path -> identifier -> mutual_inductive
+val decode_mind : mutual_inductive -> dir_path * identifier
 val encode_con : dir_path -> identifier -> constant
 val decode_con : constant -> dir_path * identifier
 
@@ -170,7 +179,7 @@ val loc_of_reference : reference -> loc
 (*s Popping one level of section in global names *)
 
 val pop_con : constant -> constant
-val pop_kn : kernel_name -> kernel_name
+val pop_kn : mutual_inductive-> mutual_inductive
 val pop_global_reference : global_reference -> global_reference
 
 (* Deprecated synonyms *)