From 638b2f594f274167e223b8dcf92f3732071dc953 Mon Sep 17 00:00:00 2001
From: ppedrot <ppedrot@85f007b7-540e-0410-9357-904b9bb8a0f7>
Date: Thu, 7 Nov 2013 17:05:29 +0000
Subject: Rewriting the proof monad mechanism. Now it uses pure OCaml code,
 without going through a Coq extraction phase.

We use second order quantification through OCaml records, which allows for
a very precise use of low-level application. This results in quite a remarkable
speedup but there is still room for improvement.

This code was written by translating straightforwardly the Coq generated code
in a human-readable dialect.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@17068 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 proofs/proofview_monad.ml | 217 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 216 insertions(+), 1 deletion(-)

(limited to 'proofs/proofview_monad.ml')

diff --git a/proofs/proofview_monad.ml b/proofs/proofview_monad.ml
index ebbb04087..f6ba5341e 100644
--- a/proofs/proofview_monad.ml
+++ b/proofs/proofview_monad.ml
@@ -1 +1,216 @@
-include Proofview_gen
+module NonLogical =
+struct
+type 'a t = unit -> 'a
+
+type 'a ref = 'a Pervasives.ref
+
+let ret = fun a -> (); fun () -> a
+
+let bind = fun a k -> (); fun () -> k (a ()) ()
+
+let ignore = fun a -> (); fun () -> ignore (a ())
+
+let seq = fun a k -> (); fun () -> a (); k ()
+
+let new_ref = fun a -> (); fun () -> Pervasives.ref a
+
+let set = fun r a -> (); fun () -> Pervasives.(:=) r a
+
+let get = fun r -> (); fun () -> Pervasives.(!) r
+
+let raise = fun e -> (); fun () -> raise (Proof_errors.Exception e)
+
+let catch = fun s h -> (); fun () -> try s () with Proof_errors.Exception e -> h e ()
+
+let read_line = fun () -> try Pervasives.read_line () with e -> raise e ()
+
+let print_char = fun c -> (); fun () -> print_char c
+
+let print = fun s -> (); fun () -> try Pp.pp s; Pp.pp_flush () with e -> raise e ()
+
+let timeout = fun n t -> (); fun () ->
+  let timeout_handler _ = Pervasives.raise (Proof_errors.Exception Proof_errors.Timeout) in
+  let psh = Sys.signal Sys.sigalrm (Sys.Signal_handle timeout_handler) in
+  Pervasives.ignore (Unix.alarm n);
+  let restore_timeout () =
+    Pervasives.ignore (Unix.alarm 0);
+    Sys.set_signal Sys.sigalrm psh
+  in
+  try
+    let res = t () in
+    restore_timeout ();
+    res
+  with
+  | e -> restore_timeout (); Pervasives.raise e
+
+let run = fun x -> try x () with Proof_errors.Exception e -> Pervasives.raise e
+
+end
+
+
+type ('a, 'b) list_view =
+| Nil of exn
+| Cons of 'a * 'b
+
+type proofview = { initial : (Term.constr*Term.types) list; solution : Evd.evar_map; comb : Goal.goal list }
+
+type logicalState = proofview
+
+type logicalMessageType = bool * (Goal.goal list * Goal.goal list)
+
+type logicalEnvironment = Environ.env
+
+type message = logicalMessageType
+type environment = logicalEnvironment
+type state = logicalState
+
+module Logical =
+struct
+
+type 'a ioT = 'a NonLogical.t
+
+type 'a logicT = { logic : 'r. ('a -> (exn -> 'r ioT) -> 'r ioT) -> (exn -> 'r ioT) -> 'r ioT }
+
+type 'a writerT = { writer : 'r. ('a -> message -> 'r logicT) -> 'r logicT }
+
+type 'a readerT = { reader : 'r. ('a -> 'r writerT) -> environment -> 'r writerT }
+
+type 'a stateT = { state : 'r. ('a -> state -> 'r readerT) -> state -> 'r readerT }
+
+type 'a t = 'a stateT
+
+let empty_message = (true, ([], []))
+
+let ret x = { state = fun k s -> k x s }
+
+let bind m f = { state = fun k s -> m.state (fun x s -> (f x).state k s) s }
+
+let ignore m = { state = fun k s -> m.state (fun _ s -> k () s) s }
+
+let seq m n =
+  { state = fun k s -> m.state (fun () s -> n.state k s) s }
+
+let set s =
+  { state = fun k _ -> k () s }
+
+let get = { state = fun k s -> k s s }
+
+let current = { state = fun k s -> { reader = fun kr e -> (k e s).reader kr e } }
+
+let join (b1, (l1, r1)) (b2, (l2, r2)) =
+  (b1 && b2, (List.append l1 l2, List.append r1 r2))
+
+let put msg =
+  { state = fun k s ->
+    let m = k () s in
+    { reader = fun kr e ->
+      let m = m.reader kr e in
+      { writer = fun kw -> m.writer
+        (fun x nmsg -> kw x (join msg nmsg))
+      }
+    }
+  }
+
+let zero err =
+  { state = fun k s ->
+    { reader = fun kr e ->
+      { writer = fun kw ->
+        { logic = fun sk fk -> fk err }
+      }
+    }
+  }
+
+let plus m f =
+  { state = fun k s ->
+    let m = m.state k s in
+    { reader = fun kr e ->
+      let m = m.reader kr e in
+      { writer = fun kw ->
+        let m = m.writer kw in
+        { logic = fun sk fk ->
+          let plus_fk err = ((((f err).state k s).reader kr e).writer kw).logic sk fk in
+          m.logic sk plus_fk
+        }
+      }
+    }
+  }
+
+let srun_state x s = { reader = fun kr _ -> kr (x, s) }
+let srun_reader x = { writer = fun kw -> kw x empty_message }
+let srun_writer x msg = { logic = fun sk fk -> sk (x, msg) fk }
+
+let srun_logic_sk x fk =
+  let next err =
+    let ans = fk err in { logic = fun sk fk ->
+    NonLogical.bind ans (function
+    | Nil err -> fk err
+    | Cons (y, n) -> sk x (fun err -> (n err).logic sk fk))
+  } in
+  let ans = Cons (x, next) in
+  NonLogical.ret ans
+
+let srun_logic_fk err = NonLogical.ret (Nil err)
+
+let split_next k s kr e kw sk fk = (); function
+| Nil _ as x ->
+  let m = k x s in
+  let m = m.reader kr e in
+  let m = m.writer kw in
+  m.logic sk fk
+| Cons (((x, s), msg), next) ->
+  let next err =
+    let next = next err in {
+    state = fun k s -> {
+      reader = fun kr e -> {
+        writer = fun kw -> {
+          logic = fun sk fk ->
+            let sk ((x, s), msg) fk =
+              let kw x nmsg = kw x (join msg nmsg) in
+              (((k x s).reader kr e).writer kw).logic sk fk
+            in
+            next.logic sk fk
+        }
+      }
+    }
+  } in
+  let m = k (Cons (x, next)) s in
+  let m = m.reader kr e in
+  let m = m.writer (fun x nmsg -> kw x (join msg nmsg)) in
+  m.logic sk fk
+
+let split m =
+  { state = fun k s ->
+    let m = m.state srun_state s in
+    { reader = fun kr e ->
+      let m = m.reader srun_reader e in
+      { writer = fun kw ->
+        let m = m.writer srun_writer in
+        { logic = fun sk fk ->
+          let m = m.logic srun_logic_sk srun_logic_fk in
+          NonLogical.bind m (split_next k s kr e kw sk fk)
+        }
+      }
+    }
+  }
+
+let lift m =
+  { state = fun k s ->
+    { reader = fun kr e ->
+      { writer = fun kw ->
+        { logic = fun sk fk ->
+          let lift x = (((k x s).reader kr e).writer kw).logic sk fk in
+          NonLogical.bind m lift
+        }
+      }
+    }
+  }
+
+let run m e s =
+  let m = m.state srun_state s in
+  let m = m.reader srun_reader e in
+  let m = m.writer srun_writer in
+  let run_fk err = NonLogical.raise (Proof_errors.TacticFailure err) in
+  let run_sk x _ = NonLogical.ret x in
+  m.logic run_sk run_fk
+
+end
-- 
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