156 lines
5.9 KiB
OCaml
156 lines
5.9 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Basic operations on core types *)
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open Asttypes
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open Types
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val generic_level: int
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val newty2: int -> type_desc -> type_expr
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(* Create a type *)
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val newgenty: type_desc -> type_expr
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(* Create a generic type *)
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val newgenvar: unit -> type_expr
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(* Return a fresh generic variable *)
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(* Use Tsubst instead
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val newmarkedvar: int -> type_expr
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(* Return a fresh marked variable *)
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val newmarkedgenvar: unit -> type_expr
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(* Return a fresh marked generic variable *)
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*)
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val repr: type_expr -> type_expr
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(* Return the canonical representative of a type. *)
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val field_kind_repr: field_kind -> field_kind
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(* Return the canonical representative of an object field
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kind. *)
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val commu_repr: commutable -> commutable
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(* Return the canonical representative of a commutation lock *)
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val row_repr: row_desc -> row_desc
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(* Return the canonical representative of a row description *)
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val row_field_repr: row_field -> row_field
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val row_field: label -> row_desc -> row_field
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(* Return the canonical representative of a row field *)
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val row_more: row_desc -> type_expr
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(* Return the extension variable of the row *)
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val static_row: row_desc -> bool
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(* Return whether the row is static or not *)
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val hash_variant: label -> int
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(* Hash function for variant tags *)
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val proxy: type_expr -> type_expr
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(* Return the proxy representative of the type: either itself
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or a row variable *)
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(**** Utilities for private abbreviations with fixed rows ****)
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val has_constr_row: type_expr -> bool
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val is_row_name: string -> bool
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(**** Utilities for type traversal ****)
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val iter_type_expr: (type_expr -> unit) -> type_expr -> unit
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(* Iteration on types *)
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val iter_row: (type_expr -> unit) -> row_desc -> unit
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(* Iteration on types in a row *)
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val iter_abbrev: (type_expr -> unit) -> abbrev_memo -> unit
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(* Iteration on types in an abbreviation list *)
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val copy_type_desc: (type_expr -> type_expr) -> type_desc -> type_desc
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(* Copy on types *)
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val copy_row:
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(type_expr -> type_expr) ->
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bool -> row_desc -> bool -> type_expr -> row_desc
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val copy_kind: field_kind -> field_kind
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val save_desc: type_expr -> type_desc -> unit
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(* Save a type description *)
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val dup_kind: field_kind option ref -> unit
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(* Save a None field_kind, and make it point to a fresh Fvar *)
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val cleanup_types: unit -> unit
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(* Restore type descriptions *)
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val lowest_level: int
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(* Marked type: ty.level < lowest_level *)
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val pivot_level: int
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(* Type marking: ty.level <- pivot_level - ty.level *)
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val mark_type: type_expr -> unit
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(* Mark a type *)
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val mark_type_node: type_expr -> unit
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(* Mark a type node (but not its sons) *)
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val mark_type_params: type_expr -> unit
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(* Mark the sons of a type node *)
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val unmark_type: type_expr -> unit
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val unmark_type_decl: type_declaration -> unit
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val unmark_class_type: class_type -> unit
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val unmark_class_signature: class_signature -> unit
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(* Remove marks from a type *)
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(**** Memorization of abbreviation expansion ****)
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val find_expans: private_flag -> Path.t -> abbrev_memo -> type_expr option
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(* Look up a memorized abbreviation *)
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val cleanup_abbrev: unit -> unit
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(* Flush the cache of abbreviation expansions.
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When some types are saved (using [output_value]), this
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function MUST be called just before. *)
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val memorize_abbrev:
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abbrev_memo ref ->
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private_flag -> Path.t -> type_expr -> type_expr -> unit
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(* Add an expansion in the cache *)
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val forget_abbrev:
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abbrev_memo ref -> Path.t -> unit
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(* Remove an abbreviation from the cache *)
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(**** Utilities for labels ****)
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val is_optional : label -> bool
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val label_name : label -> label
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val extract_label :
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label -> (label * 'a) list ->
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label * 'a * (label * 'a) list * (label * 'a) list
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(* actual label, value, before list, after list *)
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(**** Utilities for backtracking ****)
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type snapshot
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(* A snapshot for backtracking *)
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val snapshot: unit -> snapshot
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(* Make a snapshot for later backtracking. Costs nothing *)
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val backtrack: snapshot -> unit
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(* Backtrack to a given snapshot. Only possible if you have
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not already backtracked to a previous snapshot.
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Calls [cleanup_abbrev] internally *)
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(* Functions to use when modifying a type (only Ctype?) *)
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val link_type: type_expr -> type_expr -> unit
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(* Set the desc field of [t1] to [Tlink t2], logging the old
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value if there is an active snapshot *)
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val set_level: type_expr -> int -> unit
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val set_name:
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(Path.t * type_expr list) option ref ->
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(Path.t * type_expr list) option -> unit
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val set_row_field: row_field option ref -> row_field -> unit
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val set_univar: type_expr option ref -> type_expr -> unit
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val set_kind: field_kind option ref -> field_kind -> unit
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val set_commu: commutable ref -> commutable -> unit
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(* Set references, logging the old value *)
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val log_type: type_expr -> unit
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(* Log the old value of a type, before modifying it by hand *)
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