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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * Copyright INRIA, CNRS and contributors *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
(** Global CPU instruction counter. *)
(** [init ()] initialises, resets to 0, and starts the instruction counter. In
case of an error, the [Failure] exception is raised, and the counter state
is fully re-initialised so that [init] may be called again. Initialization
is required prior to calling the [drop] and [peek] functions. *)
val init : unit -> unit
(** [drop ()] undoes the effect of [init], and frees all resources used by the
internal state of the instruction counter. Note that the counter must have
been initialised before calling [drop], otherwise [Failure] is raised. *)
val drop : unit -> unit
(** [peek ()] reads the value of the instruction counter, which corresponds to
the number of instructions run by the CPU since the last (successful) call
to [init]. Note that [Failure] is raised in case of an error, including if
the function is called while the counter is not initialised. *)
val peek : unit -> Int64.t
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