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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: redexpr.ml 11094 2008-06-10 19:35:23Z herbelin $ *)
open Pp
open Util
open Names
open Term
open Declarations
open Libnames
open Rawterm
open Reductionops
open Tacred
open Closure
open RedFlags
open Libobject
(* call by value normalisation function using the virtual machine *)
let cbv_vm env _ c =
let ctyp = (fst (Typeops.infer env c)).Environ.uj_type in
Vnorm.cbv_vm env c ctyp
let set_strategy_one ref l =
let k =
match ref with
| EvalConstRef sp -> ConstKey sp
| EvalVarRef id -> VarKey id in
Conv_oracle.set_strategy k l;
match k,l with
ConstKey sp, Conv_oracle.Opaque ->
Csymtable.set_opaque_const sp
| ConstKey sp, _ ->
let cb = Global.lookup_constant sp in
if cb.const_body <> None & cb.const_opaque then
errorlabstrm "set_transparent_const"
(str "Cannot make" ++ spc () ++
Nametab.pr_global_env Idset.empty (ConstRef sp) ++
spc () ++ str "transparent because it was declared opaque.");
Csymtable.set_transparent_const sp
| _ -> ()
let cache_strategy str =
List.iter
(fun (lev,ql) -> List.iter (fun q -> set_strategy_one q lev) ql)
str
let subst_strategy (_,subs,obj) =
list_smartmap
(fun (k,ql as entry) ->
let ql' = list_smartmap (Mod_subst.subst_evaluable_reference subs) ql in
if ql==ql' then entry else (k,ql'))
obj
let map_strategy f l =
let l' = List.fold_right
(fun (lev,ql) str ->
let ql' = List.fold_right
(fun q ql ->
match f q with
Some q' -> q' :: ql
| None -> ql) ql [] in
if ql'=[] then str else (lev,ql')::str) l [] in
if l'=[] then None else Some l'
let export_strategy obj =
map_strategy (function
EvalVarRef _ -> None
| EvalConstRef _ as q -> Some q) obj
let classify_strategy (_,obj) = Substitute obj
let disch_ref ref =
match ref with
EvalConstRef c ->
let c' = Lib.discharge_con c in
if c==c' then Some ref else Some (EvalConstRef c')
| _ -> Some ref
let discharge_strategy (_,obj) =
map_strategy disch_ref obj
let (inStrategy,outStrategy) =
declare_object {(default_object "STRATEGY") with
cache_function = (fun (_,obj) -> cache_strategy obj);
load_function = (fun _ (_,obj) -> cache_strategy obj);
subst_function = subst_strategy;
discharge_function = discharge_strategy;
classify_function = classify_strategy;
export_function = export_strategy }
let set_strategy local str =
if local then cache_strategy str
else Lib.add_anonymous_leaf (inStrategy str)
let _ =
Summary.declare_summary "Transparent constants and variables"
{ Summary.freeze_function = Conv_oracle.freeze;
Summary.unfreeze_function = Conv_oracle.unfreeze;
Summary.init_function = Conv_oracle.init;
Summary.survive_module = false;
Summary.survive_section = false }
(* Generic reduction: reduction functions used in reduction tactics *)
type red_expr = (constr, evaluable_global_reference) red_expr_gen
let make_flag_constant = function
| EvalVarRef id -> fVAR id
| EvalConstRef sp -> fCONST sp
let make_flag f =
let red = no_red in
let red = if f.rBeta then red_add red fBETA else red in
let red = if f.rIota then red_add red fIOTA else red in
let red = if f.rZeta then red_add red fZETA else red in
let red =
if f.rDelta then (* All but rConst *)
let red = red_add red fDELTA in
let red = red_add_transparent red (Conv_oracle.get_transp_state()) in
List.fold_right
(fun v red -> red_sub red (make_flag_constant v))
f.rConst red
else (* Only rConst *)
let red = red_add_transparent (red_add red fDELTA) all_opaque in
List.fold_right
(fun v red -> red_add red (make_flag_constant v))
f.rConst red
in red
let is_reference c =
try let _ref = global_of_constr c in true with _ -> false
let red_expr_tab = ref Stringmap.empty
let declare_red_expr s f =
try
let _ = Stringmap.find s !red_expr_tab in
error ("There is already a reduction expression of name "^s)
with Not_found ->
red_expr_tab := Stringmap.add s f !red_expr_tab
let out_arg = function
| ArgVar _ -> anomaly "Unevaluated or_var variable"
| ArgArg x -> x
let out_with_occurrences ((b,l),c) =
((b,List.map out_arg l), c)
let reduction_of_red_expr = function
| Red internal ->
if internal then (try_red_product,DEFAULTcast)
else (red_product,DEFAULTcast)
| Hnf -> (hnf_constr,DEFAULTcast)
| Simpl (Some (_,c as lp)) ->
(contextually (is_reference c) (out_with_occurrences lp) simpl,DEFAULTcast)
| Simpl None -> (simpl,DEFAULTcast)
| Cbv f -> (cbv_norm_flags (make_flag f),DEFAULTcast)
| Lazy f -> (clos_norm_flags (make_flag f),DEFAULTcast)
| Unfold ubinds -> (unfoldn (List.map out_with_occurrences ubinds),DEFAULTcast)
| Fold cl -> (fold_commands cl,DEFAULTcast)
| Pattern lp -> (pattern_occs (List.map out_with_occurrences lp),DEFAULTcast)
| ExtraRedExpr s ->
(try (Stringmap.find s !red_expr_tab,DEFAULTcast)
with Not_found -> error("unknown user-defined reduction \""^s^"\""))
| CbvVm -> (cbv_vm ,VMcast)
|
