Module Backend_var

Variables used in the backend, optionally equipped with "provenance" information, used for the emission of debugging information.

include module type of struct include Ident end
type t = Ident.t
include Identifiable.S with type t := t
module T = Ident.T
include Identifiable.Thing with type t := T.t
include Hashtbl.HashedType with type t := T.t
val equal : T.t -> T.t -> bool

The equality predicate used to compare keys.

val hash : T.t -> int

A hashing function on keys. It must be such that if two keys are equal according to equal, then they have identical hash values as computed by hash. Examples: suitable (equal, hash) pairs for arbitrary key types include

  • ((=), hash) for comparing objects by structure (provided objects do not contain floats)
  • ((fun x y -> compare x y = 0), hash) for comparing objects by structure and handling Stdlib.nan correctly
  • ((==), hash) for comparing objects by physical equality (e.g. for mutable or cyclic objects).
include Map.OrderedType with type t := T.t
val compare : T.t -> T.t -> int

A total ordering function over the keys. This is a two-argument function f such that f e1 e2 is zero if the keys e1 and e2 are equal, f e1 e2 is strictly negative if e1 is smaller than e2, and f e1 e2 is strictly positive if e1 is greater than e2. Example: a suitable ordering function is the generic structural comparison function Stdlib.compare.

val output : out_channel -> T.t -> unit
val print : Format.formatter -> T.t -> unit
module Set = Ident.Set
module Map = Ident.Map
module Tbl = Ident.Tbl
val print_with_scope : Format.formatter -> t -> unit

Same as print except that it will also add a "n" suffix if the scope of the argument is n.

val create_scoped : scope:int -> string -> t
val create_local : string -> t
val create_persistent : string -> t
val create_predef : string -> t
val rename : t -> t

Creates an identifier with the same name as the input, a fresh stamp, and no scope.

  • raises [Fatal_error]

    if called on a persistent / predef ident.

val name : t -> string
val unique_name : t -> string
val unique_toplevel_name : t -> string
val persistent : t -> bool
val same : t -> t -> bool

Compare identifiers by binding location. Two identifiers are the same either if they are both non-persistent and have been created by the same call to create_*, or if they are both persistent and have the same name.

val compare : t -> t -> int
val global : t -> bool
val is_predef : t -> bool
val scope : t -> int
val lowest_scope : int
val highest_scope : int
val reinit : unit -> unit
type 'a tbl = 'a Ident.tbl
val empty : 'a tbl
val add : t -> 'a -> 'a tbl -> 'a tbl
val find_same : t -> 'a tbl -> 'a
val find_name : string -> 'a tbl -> t * 'a
val find_all : string -> 'a tbl -> (t * 'a) list
val fold_name : (t -> 'a -> 'b -> 'b) -> 'a tbl -> 'b -> 'b
val fold_all : (t -> 'a -> 'b -> 'b) -> 'a tbl -> 'b -> 'b
val iter : (t -> 'a -> unit) -> 'a tbl -> unit
val remove : t -> 'a tbl -> 'a tbl
val make_key_generator : unit -> t -> t
type backend_var = t
module Provenance : sig ... end
module With_provenance : sig ... end