modules: stdlib split in files ref and array

bench/programs/good/booleans.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 parameter incr : x:ref int -> { } unit writes x { x = old x + 1 }
 

bench/programs/good/complex_arg_2.mlw

@@ -2,7 +2,7 @@ module M
 
 exception Exception int
 
-use import module stdlib.Ref
+use import module ref.Ref
 
 parameter t : ref int
 

bench/programs/good/exceptions.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 exception Break
 

bench/programs/good/exns.mlw

@@ -43,7 +43,7 @@ let p6 () =
 
 (* composition of exceptions with side-effect on a reference *)
 
-use import module stdlib.Ref
+use import module ref.Ref
 
 parameter x : ref int
 

bench/programs/good/for.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 (* for loop with invariant *)
 let test1 () =

bench/programs/good/loops.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 (** 1. A loop increasing [i] up to 10. *)
 

bench/programs/good/oldify.mlw

 module M
 
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   logic q1 int int int
 

bench/programs/good/po.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 (* Tests for proof obligations. *)
 

bench/programs/good/recfun.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 (** Recursive functions *)
 

bench/programs/good/see.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 (* Side effect in expressions (Bart Jacobs' tricky example) *)
 

bench/programs/good/set.mlw

 module M
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   (* side effects in tests *)
 

bench/programs/good/wpcalls.mlw

 module M
 
 use import int.Int
-use import module stdlib.Ref
+use import module ref.Ref
 
 parameter x : ref int
 

examples/programs/algo63.mlw

@@ -15,9 +15,9 @@ Pages: 321 - 322
 module Algo63
 
   use import int.Int
-  use import module stdlib.Ref
-  use import module stdlib.Array
-  use import module stdlib.ArrayPermut
+  use import module ref.Ref
+  use import module array.Array
+  use import module array.ArrayPermut
 
   parameter partition : 
     a : array int -> m:int -> n:int -> i:ref int -> j:ref int ->

examples/programs/algo64.mlw

@@ -15,13 +15,13 @@ Pages: 321 - 322
 module Algo64
 
   use import int.Int
-  use import module stdlib.Ref
-  use import module stdlib.Array
-  use import module stdlib.ArrayPermut
+  use import module ref.Ref
+  use import module array.Array
+  use import module array.ArrayPermut
 
   logic sorted_sub (a: array int) (l u: int)
 (*
-  clone import module stdlib.ArraySorted with type elt = int, logic le = (<=)
+  clone import module array.ArraySorted with type elt = int, logic le = (<=)
 *)
  
   (* Algorithm 63 *)

examples/programs/algo65.mlw

@@ -15,9 +15,9 @@ Pages: 321 - 322
 module Algo65
 
   use import int.Int
-  use import module stdlib.Ref
-  use import module stdlib.Array
-  use import module stdlib.ArrayPermut
+  use import module ref.Ref
+  use import module array.Array
+  use import module array.ArrayPermut
  
   (* algorithm 63 *)
  

examples/programs/arm.mlw

@@ -3,8 +3,8 @@
 
 module M
 
-  use import module stdlib.Refint
-  use import module stdlib.Array
+  use import module ref.Refint
+  use import module array.Array
 
   parameter a : array int
 
@@ -44,7 +44,7 @@ module ARM
 
   use export int.Int
   use export map.Map
-  use export module stdlib.Ref
+  use export module ref.Ref
 
   (* memory *)
   parameter mem : ref (map int int)

examples/programs/binary_search.mlw

@@ -6,8 +6,8 @@ module M
 
   use import int.Int
   use import int.ComputerDivision
-  use import module stdlib.Ref
-  use import module stdlib.Array
+  use import module ref.Ref
+  use import module array.Array
 
   (* the code and its specification *)
 

examples/programs/binary_search_c.mlw

@@ -21,7 +21,7 @@ module M1
 
   use import int.Int
   use import int.ComputerDivision
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   type pointer
   type memory
@@ -67,7 +67,7 @@ module M2
 
   use import int.Int
   use import int.ComputerDivision
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   type pointer
   type memory
@@ -115,7 +115,7 @@ module M3
 
   use import int.Int
   use import int.ComputerDivision
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   type int32
   logic to_int int32 : int

examples/programs/bresenham.mlw

@@ -3,7 +3,7 @@
 module M
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   (*  Parameters. 
       Without loss of generality, we can take [x1=0] and [y1=0]. 

examples/programs/course.mlw

 module M
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   (* preliminaries *)
 

examples/programs/decrease1.mlw

@@ -8,8 +8,8 @@
 module Decrease1
 
   use import int.Int
-  use import module stdlib.Ref
-  use import module stdlib.Array
+  use import module ref.Ref
+  use import module array.Array
 
   logic decrease1 (a: array int) =
     forall i: int. 0 <= i < length a - 1 -> a[i+1] >= a[i] - 1    

examples/programs/dijkstra.mlw

 module M
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
   use set.Fset as S
   use map.Map as M
 

examples/programs/distance.mlw

@@ -17,8 +17,8 @@ module Distance
   use import int.Int
   use import int.MinMax
   use import list.List
-  use import module stdlib.Ref
-  use import module stdlib.Array
+  use import module ref.Ref
+  use import module array.Array
 
   (* Parameters. Input of the program is composed of two arrays
      of characters, [w1] of size [n1] and [w2] of size [n2]. *)

examples/programs/euler002.mlw

@@ -92,7 +92,7 @@ end
 module Solve
 
   
-  use import module stdlib.Ref
+  use import module ref.Ref
   use import FibOnlyEven
 
   let f m : int = 

examples/programs/fib_memo.mlw

@@ -3,7 +3,7 @@
 module M
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   logic fib int : int
 

examples/programs/fibonacci.mlw

@@ -26,7 +26,7 @@ module FibonacciLinear
 
   use import Fibonacci
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   let fib (n:int) : int =
     { n >= 0 }

examples/programs/flag.mlw

@@ -3,9 +3,9 @@
 module Flag
 
   use import int.Int
-  use import module stdlib.Ref
-  use import module stdlib.Array
-  use import module stdlib.ArrayPermut
+  use import module ref.Ref
+  use import module array.Array
+  use import module array.ArrayPermut
 
   type color = Blue | White | Red
 

examples/programs/gcd_bezout.mlw

@@ -3,7 +3,7 @@ module M
   use import int.Int
   use import int.ComputerDivision
   use import int.Gcd
-  use import module stdlib.Ref
+  use import module ref.Ref
 
 let gcd (x:int) (y:int) =
   { x >= 0 and y >= 0 }

examples/programs/isqrt.mlw

@@ -4,7 +4,7 @@
 module M
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   logic sqr (x:int) : int = x * x
 

examples/programs/list_rev.mlw

@@ -2,7 +2,7 @@
 module M
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
   use import map.Map
 
   type pointer

examples/programs/mac_carthy.mlw

@@ -17,7 +17,7 @@ module M
 
   (* non-recursive implementation using a while loop *)
 
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   logic f (x: int) : int =
     if x >= 101 then x-10 else 91

examples/programs/muller.mlw

@@ -2,8 +2,8 @@
 module Muller
 
   use import int.Int
-  use import module stdlib.Refint
-  use import module stdlib.Array
+  use import module ref.Refint
+  use import module array.Array
 
   type param = M.map int int
   logic pr (a : param) (n : int) = M.get a n <> 0

examples/programs/next_digit_sum.mlw

@@ -10,8 +10,8 @@ module M
 *)
 
   use import int.Int
-  use import module stdlib.Ref
-  use import module stdlib.Array
+  use import module ref.Ref
+  use import module array.Array
   use import int.MinMax
   use import int.EuclideanDivision
   use import int.Power

examples/programs/power.mlw

@@ -39,7 +39,7 @@ module M
 
   (* non-recursive implementation using a while loop *)
 
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   let fast_exp_imperative x n =
     { 0 <= n }

examples/programs/quicksort.mlw

@@ -8,11 +8,11 @@
 module Quicksort
 
   use import int.Int
-  use import module stdlib.Ref
-  use import module stdlib.Array
-  use import module stdlib.ArraySorted
-  use import module stdlib.ArrayPermut
-  use import module stdlib.ArrayEq
+  use import module ref.Ref
+  use import module array.Array
+  use import module array.ArraySorted
+  use import module array.ArrayPermut
+  use import module array.ArrayEq
 
   let swap (t:array int) (i:int) (j:int) =
     { 0 <= i < length t and 0 <= j < length t }

examples/programs/relabel.mlw

@@ -37,7 +37,7 @@ module Relabel
         same_shape (Node l1 r1) (Node l2 r2)
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
  
   parameter r : ref int
 

examples/programs/sf.mlw

@@ -9,7 +9,7 @@
 module HoareLogic
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   (* Example: Slow Subtraction *)
 
@@ -96,7 +96,7 @@ end
 module MoreHoareLogic
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
   use import list.List
   use import list.HdTl
   use import list.Length

examples/programs/talk290.mlw

@@ -5,7 +5,7 @@ module M
 (* answer: 20444710234716473 *)
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
   use import int.EuclideanDivision
   use import int.Power
 

examples/programs/vacid_0_build_maze.mlw

@@ -31,7 +31,7 @@ end
 module UnionFind_sig
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   use export UnionFind
 
@@ -75,10 +75,8 @@ theory Graph
   type graph
 
   inductive path graph vertex vertex =
-    | Path_refl : 
-        forall g:graph, x:vertex. path g x x
-    | Path_sym  : 
-        forall g:graph, x y:vertex. path g x y -> path g y x
+    | Path_refl : forall g:graph, x:vertex. path g x x
+    | Path_sym  : forall g:graph, x y:vertex. path g x y -> path g y x
     | Path_trans:
         forall g:graph, x y z:vertex. path g x y -> path g y z -> path g x z
 
@@ -93,11 +91,10 @@ end
 module Graph_sig
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
-  clone export Graph with type vertex = int
-(*  use export Graph *)
-(*  use export Graph_int*)
+  (* clone export Graph with type vertex = int *)
+  use export Graph_int
 
   parameter graph : ref graph
 
@@ -119,7 +116,7 @@ end
 module BuildMaze
 
   use import int.Int
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   use import module UnionFind_sig
   use import module Graph_sig
@@ -129,7 +126,7 @@ module BuildMaze
   lemma Ineq1 :
     forall n x y:int. 0 <= n -> 0 <= x < n -> 0 <= y < n -> 0 <= x*n+y < n*n
 
-  let add_edge_and_union u (a:int) (b:int) =
+  let add_edge_and_union (u: ref uf) (a:int) (b:int) =
     { 0 <= a < size u and 0 <= b < size u and
       not same u a b and not path graph a b and
       forall x y:int.

examples/programs/vacid_0_red_black_trees.mlw

 module M
 
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   (* Red-black trees (data type) *)
 

examples/programs/vacid_0_red_black_trees_harness.mlw

 module M
 
-  use import module stdlib.Ref
+  use import module ref.Ref
 
   type key = int
   type value = int

examples/programs/vacid_0_sparse_array.mlw

@@ -21,8 +21,8 @@ back  +-+-+-+-------------------+
 *)
 
   use import int.Int
-  use import module stdlib.Ref
-  use array.ArrayLength as A
+  use import module ref.Ref
+  use import module array.Array as A
 
   logic maxlen : int = 1000
 
@@ -31,31 +31,28 @@ back  +-+-+-+-------------------+
   logic c1 : elt
   logic c2 : elt
 
-  type array 'a = A.t int 'a
+  type sparse_array = {| val  : array elt;
+                         idx  : array int;
+                         back : array int;
+                 mutable card : int; |}
 
-  logic (#) (a : array 'a) (i : int) : 'a = A.get a i
+  logic length (a: sparse_array) : int = A.length a.val
 
-  type sparse_array = SA (sa_val  : array elt)
-                         (sa_idx  : array int)
-                         (sa_back : array int)
-                         (sa_sz   : int)
-                         (sa_n    : int)
-
-  logic is_elt (a : sparse_array) (i : int) =
-    let (SA val idx back _ n) = a in
-    0 <= idx#i < n and back#(idx#i) = i
+  logic is_elt (a: sparse_array) (i: int) =
+    0 <= a.idx[i] < a.card and a.back[a.idx[i]] = i
 
   logic model (a : sparse_array) (i : int) : elt =
     if is_elt a i then
-      (sa_val a)#i
+      a.val[i]
     else
       default
 
   logic invariant_ (a : sparse_array) =
-    let (SA val idx back sz n) = a in
-    0 <= n <= sz <= maxlen and
-    A.length val = sz and A.length idx = sz and A.length back = sz and
-    forall i : int. 0 <= i < n -> 0 <= back#i < sz and idx#(back#i) = i
+    0 <= a.card <= length a <= maxlen and
+    A.length a.val = A.length a.idx = A.length a.back and
+    forall i : int.
+      0 <= i < a.card ->
+      0 <= a.back[i] < length a and a.idx[a.back[i]] = i
 
   (*
     The following definitions and the axiom Dirichlet
@@ -64,9 +61,9 @@ back  +-+-+-+-------------------+
     the proof of WPs for the function [set] below.
   *)
 
-  logic permutation (n : int) (a : array int) =
-    (forall i : int. 0 <= i < n -> 0 <= a#i < n) and
-    (forall i j : int. 0 <= i < j < n -> a#i <> a#j)
+  logic permutation (n: int) (a: array int) =
+    (forall i : int. 0 <= i < n -> 0 <= a[i] < n) and
+    (forall i j : int. 0 <= i < j < n -> a[i] <> a[j])
 
   logic dirichlet (n : int) (a : array int) (i : int) : int
 
@@ -76,47 +73,42 @@ back  +-+-+-+-------------------+
         permutation n a ->
         (forall i : int. 0 <= i < n ->
             0 <= dirichlet n a i < n and
-            a # dirichlet n a i = i)
+            a[dirichlet n a i] = i)
 
   lemma Inter6 :
     forall a : sparse_array . invariant_ a ->
-        let (SA val idx back sz n) = a in
-        n = sz ->
-            permutation sz back &&
-            forall i : int. 0 <= i < sz ->
-                idx#i = dirichlet sz back i && is_elt a i
+      a.card = length a ->
+            permutation a.card a.back &&
+            forall i : int. 0 <= i < a.card ->
+                a.idx[i] = dirichlet a.card a.back i && is_elt a i
 
-(*
 parameter create :
   sz:int ->
   { 0 <= sz <= maxlen }
-  ref sparse_array
-  { sa_sz !result = sz and forall i:int. model !result i = default }
-*)
+  sparse_array
+  { invariant_ result and
+    result.card = 0 and
+    length result = sz and forall i:int. model result i = default }
 
+(*
 parameter malloc : n:int -> {} array 'a { A.length result = n }
 
 let create sz =
   { 0 <= sz <= maxlen }
-  ref (SA (malloc sz) (malloc sz) (malloc sz) sz 0)
+  Mk_sparse_array (malloc sz) (malloc sz) (malloc sz) 0
   { invariant_ result and
     sa_sz result = sz and forall i:int. model result i = default }
+*)
 
-let array_get (a : array 'a) i =
-  { 0 <= i < A.length a } A.get a i { result = A.get a i }
-
-let array_set (a : array 'a) i v =
-  { 0 <= i < A.length a } A.set a i v { result = A.set a i v }
-
-let test (a : ref sparse_array) i =
-  { 0 <= i < sa_sz a and invariant_ a }
-  let idx = sa_idx !a in
-  let back = sa_back !a in
-  let n = sa_n !a in
-  0 <= array_get idx i && array_get idx i < n &&
-  array_get back (array_get idx i) = i
+let test (a: sparse_array) i =
+  { 0 <= i < length a and invariant_ a }
+  let idx = idx a in