engine.ml

(**************************************************************************)
(*                                                                        *)
(*  This file is part of WP plug-in of Frama-C.                           *)
(*                                                                        *)
(*  Copyright (C) 2007-2023                                               *)
(*    CEA (Commissariat a l'energie atomique et aux energies              *)
(*         alternatives)                                                  *)
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(*  you can redistribute it and/or modify it under the terms of the GNU   *)
(*  Lesser General Public License as published by the Free Software       *)
(*  Foundation, version 2.1.                                              *)
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(*  It is distributed in the hope that it will be useful,                 *)
(*  but WITHOUT ANY WARRANTY; without even the implied warranty of        *)
(*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *)
(*  GNU Lesser General Public License for more details.                   *)
(*                                                                        *)
(*  See the GNU Lesser General Public License version 2.1                 *)
(*  for more details (enclosed in the file licenses/LGPLv2.1).            *)
(*                                                                        *)
(**************************************************************************)

(* -------------------------------------------------------------------------- *)
(* --- Engine Signature                                                   --- *)
(* -------------------------------------------------------------------------- *)

(** Generic Engine Signature *)

open Format
open Plib

type op =
  | Op of string (** Infix or prefix operator *)
  | Assoc of string (** Left-associative binary operator (like + and -) *)
  | Call of string (** Logic function or predicate *)

type link =
  | F_call  of string (** n-ary function *)
  | F_subst of string * string (** n-ary function with substitution
                                   first value is the link name, second is the
                                   substitution (e.g. "foo(%1,%2)") *)
  | F_left  of string (** 2-ary function left-to-right + *)
  | F_right of string (** 2-ary function right-to-left + *)
  | F_list of string * string (** n-ary function with (cons,nil) constructors *)
  | F_assoc of string (** associative infix operator *)
  | F_bool_prop of string * string (** Has a bool and prop version *)

type callstyle =
  | CallVar  (** Call is [f(x,...)] ; [f()] can be written [f] *)
  | CallVoid (** Call is [f(x,...)] ; in [f()], [()] is mandatory *)
  | CallApply (** Call is [f x ...] *)

type mode =
  | Mpositive  (** Current scope is [Prop] in positive position. *)
  | Mnegative  (** Current scope is [Prop] in negative position. *)
  | Mterm      (** Current scope is [Term]. *)
  | Mterm_int  (** [Int]  is required but actual scope is [Term]. *)
  | Mterm_real (** [Real] is required but actual scope is [Term]. *)
  | Mint       (** Current scope is [Int]. *)
  | Mreal      (** Current scope is [Real]. *)

type flow = Flow | Atom

type cmode = Cprop | Cterm
type amode = Aint | Areal
type pmode = Positive | Negative | Boolean

type ('x,'f) ftrigger =
  | TgAny
  | TgVar  of 'x