(******************************************************************************)
(*     Alt-Ergo: The SMT Solver For Software Verification                     *)
(*     Copyright (C) 2013-2015 --- OCamlPro                                   *)
(*     This file is distributed under the terms of the CeCILL-C licence       *)
(******************************************************************************)

(******************************************************************************)
(*     The Alt-Ergo theorem prover                                            *)
(*     Copyright (C) 2006-2013                                                *)
(*     CNRS - INRIA - Universite Paris Sud                                    *)
(*                                                                            *)
(*     Sylvain Conchon                                                        *)
(*     Evelyne Contejean                                                      *)
(*                                                                            *)
(*     Francois Bobot                                                         *)
(*     Mohamed Iguernelala                                                    *)
(*     Stephane Lescuyer                                                      *)
(*     Alain Mebsout                                                          *)
(*                                                                            *)
(*   This file is distributed under the terms of the CeCILL-C licence         *)
(******************************************************************************)

open Format

type ty_module =
  | M_None
  | M_Typing
  | M_Sat
  | M_Match
  | M_CC
  | M_UF
  | M_Arith
  | M_Arrays
  | M_Sum
  | M_Records
  | M_AC
  | M_Formula
  | M_Literal
  | M_Term
  | M_Triggers

let mtag k = match k with
  | M_None   -> 0
  | M_Typing -> 1
  | M_Sat    -> 2
  | M_Match  -> 3
  | M_CC     -> 4
  | M_UF     -> 5
  | M_Arith  -> 6
  | M_Arrays -> 7
  | M_Sum    -> 8
  | M_Records-> 9
  | M_AC     -> 10
  | M_Formula-> 11
  | M_Literal-> 12
  | M_Term   -> 13
  | M_Triggers->14

let nb_mtag = 15

type ty_function =
  | F_add
  | F_add_lemma
  | F_add_predicate
  | F_add_terms
  | F_are_equal
  | F_assume
  | F_class_of
  | F_leaves
  | F_make
  | F_m_lemmas
  | F_m_predicates
  | F_query
  | F_solve
  | F_subst
  | F_union
  | F_unsat
  | F_none
  | F_new_facts
  | F_apply_subst

let ftag f = match f with
  | F_add           -> 0
  | F_add_lemma     -> 1
  | F_assume        -> 2
  | F_class_of      -> 3
  | F_leaves        -> 4
  | F_make          -> 5
  | F_m_lemmas      -> 6
  | F_m_predicates  -> 7
  | F_query         -> 8
  | F_solve         -> 9
  | F_subst         -> 10
  | F_union         -> 11
  | F_unsat         -> 12
  | F_add_predicate -> 13
  | F_add_terms     -> 14
  | F_are_equal     -> 15
  | F_none          -> 16
  | F_new_facts     -> 17
  | F_apply_subst   -> 18

let nb_ftag = 19

type t = {
  (* current time *)
  mutable cur_u : float;

  (* current activated (module x function) for time profiling *)
  mutable cur_t : (ty_module * ty_function * int);

  (* stack of suspended (module x function)s callers *)
  mutable stack : (ty_module * ty_function * int) list;

  (* table of timers for each combination "" *)
  z : (float array) array;
  (*h:(ty_module, float ref) Hashtbl.t;*)
}

let cpt_id = ref 0
let fresh_id () = incr cpt_id; !cpt_id

(** return a new empty env **)
let empty () =
  { cur_t = (M_None, F_none, 0);
    cur_u = 0.0;
    stack = [];
    z = Array.init nb_mtag (fun _ -> Array.make nb_ftag 0.);
  }


(** reset the references of the given env to empty **)
let reset env =
  for i = 0 to nb_mtag - 1 do
    let a = env.z.(i) in for j = 0 to nb_ftag - 1 do a.(j) <- 0. done
  done;
  env.cur_t <- (M_None, F_none, 0);
  env.cur_u <- 0.0;
  env.stack <- [];
  cpt_id := 0

let accumulate env cur m f =
  let mt = mtag m in
  let ft = ftag f in
  env.z.(mt).(ft) <- env.z.(mt).(ft) +. (cur -. env.cur_u)

(** save the current timer and start the timer m x f **)
let start env m f =
  let cur = MyUnix.cur_time() in
  begin
    match env.cur_t with
    | (M_None, _, _) -> ()
    | kd ->
      accumulate env cur m f;
      env.stack <- kd :: env.stack
  end;
  env.cur_t <- (m, f, fresh_id());
  env.cur_u <- cur

(** pause the timer "m x f" and restore the former timer **)
let pause env m f =
  let cur = MyUnix.cur_time() in
  accumulate env cur m f;
  env.cur_u <- cur;
  match env.stack with
  | [] ->
    env.cur_t <- (M_None, F_none, 0)
  | kd::st ->
    env.cur_t <- kd;
    env.stack <- st

(** update the value of the current timer **)
let update env =
  let cur = MyUnix.cur_time() in
  let m, f, id = env.cur_t in
  accumulate env cur m f;
  env.cur_u <- cur

(** get the value of the timer "m x f" **)
let get_value env m f = env.z.(mtag m).(ftag f)

(** get the sum of the "ty_function" timers for the given "ty_module" **)
let get_sum env m =
  let cpt = ref 0. in
  Array.iter (fun v -> cpt := !cpt +. v) env.z.(mtag m);
  !cpt

let string_of_ty_module k = match k with
  | M_None   -> "None"
  | M_Typing -> "Typing"
  | M_Sat    -> "Sat"
  | M_Match  -> "Match"
  | M_CC     -> "CC"
  | M_UF     -> "UF"
  | M_Arith  -> "Arith"
  | M_Arrays -> "Arrays"
  | M_Sum    -> "Sum"
  | M_Records-> "Records"
  | M_AC     -> "AC"
  | M_Formula-> "Formula"
  | M_Literal-> "Literal"
  | M_Term   -> "Term"
  | M_Triggers->"Triggers"

let string_of_ty_function f = match f with
  | F_add           -> "add"
  | F_add_lemma     -> "add_lemma"
  | F_assume        -> "assume"
  | F_class_of      -> "class_of"
  | F_leaves        -> "leaves"
  | F_make          -> "make"
  | F_m_lemmas      -> "m_lemmas"
  | F_m_predicates  -> "m_predicates"
  | F_query         -> "query"
  | F_solve         -> "solve"
  | F_subst         -> "subst"
  | F_union         -> "union"
  | F_unsat         -> "unsat"
  | F_add_predicate -> "add_predicate"
  | F_add_terms     -> "add_terms"
  | F_are_equal     -> "are_equal"
  | F_none          -> "none"
  | F_new_facts     -> "new_facts"
  | F_apply_subst   -> "apply_subst"

let current_timer env = env.cur_t

let get_stack env = env.stack

let get_timers_array env = env.z

let all_functions =
    let l =
      [ F_add;
        F_add_lemma;
        F_add_predicate;
        F_add_terms;
        F_are_equal;
        F_assume;
        F_class_of;
        F_leaves;
        F_make;
        F_m_lemmas;
        F_m_predicates;
        F_query;
        F_solve;
        F_subst;
        F_union;
        F_unsat;
        F_none;
        F_new_facts;
        F_apply_subst
      ]
    in
    assert (List.length l = nb_ftag);
    l

let all_modules =
  let l =
    [ M_None;
      M_Typing;
      M_Sat;
      M_Match;
      M_CC;
      M_UF;
      M_Arith;
      M_Arrays;
      M_Sum;
      M_Records;
      M_AC;
      M_Formula;
      M_Literal;
      M_Term;
      M_Triggers;
    ]
  in
  assert (List.length l = nb_mtag);
  l
