heptagon/compiler/utilities/misc.ml

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(**************************************************************************)
(* *)
(* Heptagon *)
(* *)
(* Author : Marc Pouzet *)
(* Organization : Demons, LRI, University of Paris-Sud, Orsay *)
(* *)
(**************************************************************************)
(* useful stuff *)
let optional f = function
| None -> None
| Some x -> Some (f x)
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let optional_wacc f acc = function
| None -> None, acc
| Some x -> let x, acc = f acc x in Some x, acc
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let optunit f = function
| None -> ()
| Some x -> f x
(** Print to a string *)
let print_pp_to_string print_fun element =
let _ = Format.flush_str_formatter () in (* Ensure that the buffer is empty *)
print_fun Format.str_formatter element;
Format.flush_str_formatter ()
(** Replace all non [a-z A-Z 0-9] character of a string by [_] *)
let sanitize_string s =
Str.global_replace (Str.regexp "[^a-zA-Z0-9]") "_" s
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(* creation of names. Ensure unicity for the whole compilation chain *)
let symbol = ref 0
let gen_symbol () = incr symbol; "_"^(string_of_int !symbol)
let reset_symbol () = symbol := (*!min_symbol*) 0
let unique l =
let tbl = Hashtbl.create (List.length l) in
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List.iter (fun i -> Hashtbl.replace tbl i ()) l;
Hashtbl.fold (fun key _ accu -> key :: accu) tbl []
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let rec map_butlast f l =
match l with
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| [] -> []
| [a] -> [a]
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| a::l -> (f a)::(map_butlast f l)
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let map_butnlast n f l =
let rec aux l = match l with
| [] -> [], 0
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| a::l ->
let (res, k) = aux l in
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if k < n then
a::res, (k + 1)
else
(f a)::res, (k+1)
in
let res, _ = aux l in
res
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let rec last_element l =
match l with
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| [] -> assert false
| [v] -> v
| _::l -> last_element l
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(** [split_last l] returns l without its last element and
the last element of l. *)
let rec split_last = function
| [] -> assert false
| [a] -> [], a
| v::l ->
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let l, a = split_last l in
v::l, a
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(** [split_nlasts l] returns l without its last n elements and
the last n elements of l. *)
let rec split_nlast n l =
let rec aux l = match l with
| [] -> [], [], 0
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| a::l ->
let (l1, l2, k) = aux l in
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if k < n then
l1, a::l2, (k + 1)
else
a::l1, l2, (k+1)
in
let l1, l2, k = aux l in
if (k < n) then
assert false
else l1, l2
exception List_too_short
(** [split_at n l] splits [l] in two after the [n]th value.
Raises List_too_short exception if the list is too short. *)
let rec split_at n l = match n, l with
| 0, l -> [], l
| _, [] -> raise List_too_short
| n, x::l ->
let l1, l2 = split_at (n-1) l in
x::l1, l2
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let rec take n l = match n, l with
| 0, l -> []
| n, h :: t -> take (n - 1) t
| _ -> invalid_arg "take: list is too short"
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let remove x l =
List.filter (fun y -> x <> y) l
let list_compare c l1 l2 =
let rec aux l1 l2 = match (l1, l2) with
| (h1::t1, h2::t2) ->
let result = c h1 h2 in
if result = 0 then aux t1 t2 else result
| ([], [] ) -> 0
| (_, [] ) -> 1
| ([], _ ) -> -1
in aux l1 l2
let option_compare f ox1 ox2 = match ox1, ox2 with
| None, None -> 0
| Some x1, Some x2 -> f x1 x2
| None, _ -> -1
| _, None -> 1
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let is_empty = function
| [] -> true
| _ -> false
(** [repeat_list v n] returns a list with n times the value v. *)
let repeat_list v n =
let rec aux = function
| 0 -> []
| n -> v::(aux (n-1))
in
aux n
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(** Same as List.mem_assoc but using the value instead of the key. *)
let rec memd_assoc value = function
| [] -> false
| (_,d)::l -> (d = value) or (memd_assoc value l)
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(** Same as List.assoc but searching for a data and returning the key. *)
let rec assocd value = function
| [] -> raise Not_found
| (k,d)::l ->
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if d = value then
k
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else
assocd value l
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(** { 3 Compiler iterators } *)
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(** Mapfold *) (* TODO optim : in a lot of places we don't need the List.rev *)
let mapfold f acc l =
let l,acc = List.fold_left
(fun (l,acc) e -> let e,acc = f acc e in e::l, acc)
([],acc) l in
List.rev l, acc
let mapfold2 f acc l1 l2 =
let l,acc = List.fold_left2
(fun (l,acc) e1 e2 -> let e,acc = f acc e1 e2 in e::l, acc)
([],acc) l1 l2 in
List.rev l, acc
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let mapfold_right f l acc =
List.fold_right (fun e (acc, l) -> let acc, e = f e acc in (acc, e :: l))
l (acc, [])
let rec fold_right_1 f l = match l with
| [] -> invalid_arg "fold_right_1: empty list"
| [x] -> x
| x :: l -> f x (fold_right_1 f l)
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let rec fold_left_1 f l = match l with
| [] -> invalid_arg "fold_left_1: empty list"
| [x] -> x
| x :: l -> f (fold_left_1 f l) x
let rec fold_left4 f acc l1 l2 l3 l4 = match l1, l2, l3, l4 with
| [], [], [], [] -> acc
| x1 :: l1, x2 :: l2, x3 :: l3, x4 :: l4 -> fold_left4 f (f acc x1 x2 x3 x4) l1 l2 l3 l4
| _ -> invalid_arg "Misc.fold_left4"
let mapi f l =
let rec aux i = function
| [] -> []
| v::l -> (f i v)::(aux (i+1) l)
in
aux 0 l
let mapi2 f l1 l2 =
let rec aux i l1 l2 =
match l1, l2 with
| [], [] -> []
| [], _ -> invalid_arg ""
| _, [] -> invalid_arg ""
| v1::l1, v2::l2 -> (f i v1 v2)::(aux (i+1) l1 l2)
in
aux 0 l1 l2
let mapi3 f l1 l2 l3 =
let rec aux i l1 l2 l3 =
match l1, l2, l3 with
| [], [], [] -> []
| [], _, _ -> invalid_arg ""
| _, [], _ -> invalid_arg ""
| _, _, [] -> invalid_arg ""
| v1::l1, v2::l2, v3::l3 ->
(f i v1 v2 v3)::(aux (i+1) l1 l2 l3)
in
aux 0 l1 l2 l3
let fold_righti f l acc =
let rec aux i l acc = match l with
| [] -> acc
| h :: l -> f i h (aux (i + 1) l acc) in
aux 0 l acc
exception Assert_false
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let internal_error passe =
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Format.eprintf "@.---------\n
Internal compiler error\n
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Passe : %s\n
----------@." passe;
raise Assert_false
exception Unsupported
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let unsupported passe =
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Format.eprintf "@.---------\n
Unsupported feature, please report it\n
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Passe : %s\n
----------@." passe;
raise Unsupported
(* Functions to decompose a list into a tuple *)
let _arity_error i l =
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Format.eprintf "@.---------\n
Internal compiler error: wrong list size (found %d, expected %d).\n
----------@." (List.length l) i;
raise Assert_false
let _arity_min_error i l =
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Format.eprintf "@.---------\n
Internal compiler error: wrong list size (found %d, expected %d at least).\n
----------@." (List.length l) i;
raise Assert_false
let assert_empty = function
| [] -> ()
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| l -> _arity_error 0 l
let assert_1 = function
| [v] -> v
| l -> _arity_error 1 l
let assert_1min = function
| v::l -> v, l
| l -> _arity_min_error 1 l
let assert_2 = function
| [v1; v2] -> v1, v2
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| l -> _arity_error 2 l
let assert_2min = function
| v1::v2::l -> v1, v2, l
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| l -> _arity_min_error 2 l
let assert_3 = function
| [v1; v2; v3] -> v1, v2, v3
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| l -> _arity_error 3 l
let (|>) x f = f x
let split_string s separator = Str.split (separator |> Str.quote |> Str.regexp) s
let file_extension s = split_string s "." |> last_element
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(** Memoize the result of the function [f]*)
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let memoize f =
let map = Hashtbl.create 100 in
fun x ->
try
Hashtbl.find map x
with
| Not_found -> let r = f x in Hashtbl.add map x r; r
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(** Memoize the result of the function [f], taht should expect a
tuple as input and be reflexive (f (x,y) = f (y,x)) *)
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let memoize_couple f =
let map = Hashtbl.create 100 in
fun (x,y) ->
try
Hashtbl.find map (x,y)
with
| Not_found ->
let r = f (x,y) in Hashtbl.add map (x,y) r; Hashtbl.add map (y,x) r; r
(** [iter_couple f l] calls f for all x and y distinct in [l]. *)
let rec iter_couple f l = match l with
| [] -> ()
| x::l ->
List.iter (f x) l;
iter_couple f l
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(** [iter_couple_2 f l1 l2] calls f for all x in [l1] and y in [l2]. *)
let iter_couple_2 f l1 l2 =
List.iter (fun v1 -> List.iter (f v1) l2) l1
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(** [index p l] returns the idx of the first element in l
that satisfies predicate p.*)
let index p l =
let rec aux i = function
| [] -> -1
| v::l -> if p v then i else aux (i+1) l
in
aux 0 l