483 lines
15 KiB
OCaml
483 lines
15 KiB
OCaml
(* Environment handling *)
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open Format
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open Config
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open Misc
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open Asttypes
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open Longident
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open Path
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open Typedtree
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type error =
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Not_an_interface of string
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| Corrupted_interface of string
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| Illegal_renaming of string * string
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exception Error of error
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type t = {
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values: (Path.t * value_description) Ident.tbl;
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constrs: constructor_description Ident.tbl;
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labels: label_description Ident.tbl;
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types: (Path.t * type_declaration) Ident.tbl;
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modules: (Path.t * module_type) Ident.tbl;
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modtypes: (Path.t * modtype_declaration) Ident.tbl;
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components: (Path.t * structure_components) Ident.tbl
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}
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and structure_components = {
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mutable comp_values: (string, (value_description * int)) Tbl.t;
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mutable comp_constrs: (string, (constructor_description * int)) Tbl.t;
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mutable comp_labels: (string, (label_description * int)) Tbl.t;
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mutable comp_types: (string, (type_declaration * int)) Tbl.t;
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mutable comp_modules: (string, (module_type * int)) Tbl.t;
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mutable comp_modtypes: (string, (modtype_declaration * int)) Tbl.t;
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mutable comp_components: (string, (structure_components * int)) Tbl.t
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}
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let empty = {
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values = Ident.empty; constrs = Ident.empty;
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labels = Ident.empty; types = Ident.empty;
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modules = Ident.empty; modtypes = Ident.empty;
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components = Ident.empty }
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(* Persistent structure descriptions *)
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type pers_struct =
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{ ps_name: string;
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ps_sig: signature;
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ps_comps: structure_components }
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let persistent_structures =
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(Hashtbl.new 17 : (string, pers_struct) Hashtbl.t)
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let imported_units = ref ([] : (string * int) list)
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let read_pers_struct modname filename =
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let ic = open_in_bin filename in
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try
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let buffer = String.create (String.length cmi_magic_number) in
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really_input ic buffer 0 (String.length cmi_magic_number);
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if buffer <> cmi_magic_number then begin
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close_in ic;
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raise(Error(Not_an_interface filename))
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end;
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let ps = (input_value ic : pers_struct) in
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let crc = input_binary_int ic in
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close_in ic;
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if ps.ps_name <> modname then
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raise(Error(Illegal_renaming(modname, filename)));
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(ps, crc)
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with End_of_file | Failure _ ->
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close_in ic;
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raise(Error(Corrupted_interface(filename)))
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let find_pers_struct name =
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try
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Hashtbl.find persistent_structures name
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with Not_found ->
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let (ps, crc) =
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read_pers_struct name
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(find_in_path !load_path (lowercase name ^ ".cmi")) in
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Hashtbl.add persistent_structures name ps;
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imported_units := (name, crc) :: !imported_units;
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ps
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let reset_cache() =
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Hashtbl.clear persistent_structures;
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imported_units := []
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(* Lookup by identifier *)
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let rec find_module_descr path env =
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match path with
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Pident id ->
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begin try
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let (p, desc) = Ident.find_same id env.components
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in desc
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with Not_found ->
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if Ident.persistent id
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then (find_pers_struct (Ident.name id)).ps_comps
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else raise Not_found
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end
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| Pdot(p, s, pos) ->
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let descr_p = find_module_descr p env in
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let (descr, pos) = Tbl.find s descr_p.comp_components in
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descr
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let find proj1 proj2 path env =
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try
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match path with
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Pident id ->
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let (p, data) = Ident.find_same id (proj1 env)
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in data
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| Pdot(p, s, pos) ->
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let (data, pos) = Tbl.find s (proj2 (find_module_descr p env))
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in data
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with Not_found ->
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fatal_error "Env.find"
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let find_value = find (fun env -> env.values) (fun sc -> sc.comp_values)
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and find_type = find (fun env -> env.types) (fun sc -> sc.comp_types)
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and find_modtype = find (fun env -> env.modtypes) (fun sc -> sc.comp_modtypes)
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(* Lookup by name *)
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let rec lookup_module_descr lid env =
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match lid with
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Lident s ->
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begin try
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Ident.find_name s env.components
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with Not_found ->
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(Pident(Ident.new_persistent s), (find_pers_struct s).ps_comps)
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end
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| Ldot(p, s) ->
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let (path, descr_p) = lookup_module_descr p env in
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let (descr, pos) = Tbl.find s descr_p.comp_components in
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(Pdot(path, s, pos), descr)
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let lookup proj1 proj2 lid env =
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match lid with
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Lident s ->
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Ident.find_name s (proj1 env)
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| Ldot(p, s) ->
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let (path, descr) = lookup_module_descr p env in
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let (data, pos) = Tbl.find s (proj2 descr) in
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(Pdot(path, s, pos), data)
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let lookup_simple proj1 proj2 lid env =
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match lid with
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Lident s ->
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Ident.find_name s (proj1 env)
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| Ldot(p, s) ->
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let (path, descr) = lookup_module_descr p env in
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let (data, pos) = Tbl.find s (proj2 descr) in
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data
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let lookup_value =
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lookup (fun env -> env.values) (fun sc -> sc.comp_values)
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and lookup_constructor =
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lookup_simple (fun env -> env.constrs) (fun sc -> sc.comp_constrs)
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and lookup_label =
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lookup_simple (fun env -> env.labels) (fun sc -> sc.comp_labels)
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and lookup_type =
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lookup (fun env -> env.types) (fun sc -> sc.comp_types)
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and lookup_modtype =
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lookup (fun env -> env.modtypes) (fun sc -> sc.comp_modtypes)
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let lookup_module lid env =
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match lid with
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Lident s ->
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begin try
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Ident.find_name s env.modules
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with Not_found ->
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(Pident(Ident.new_persistent s),
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Tmty_signature(find_pers_struct s).ps_sig)
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end
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| Ldot(p, s) ->
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let (path, descr) = lookup_module_descr p env in
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let (data, pos) = Tbl.find s descr.comp_modules in
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(Pdot(path, s, pos), data)
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(* Scrape a module type *)
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let rec scrape_modtype mty env =
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match mty with
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Tmty_ident path ->
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begin match find_modtype path env with
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Tmodtype_manifest mty -> scrape_modtype mty env
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| Tmodtype_abstract -> mty
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end
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| _ -> mty
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(* Compute constructor descriptions *)
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let constructors_of_type ty_path decl =
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match decl.type_kind with
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Type_variant cstrs ->
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Datarepr.constructor_descrs (Tconstr(ty_path, decl.type_params)) cstrs
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| _ -> []
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(* Compute label descriptions *)
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let labels_of_type ty_path decl =
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match decl.type_kind with
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Type_record labels ->
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Datarepr.label_descrs (Tconstr(ty_path, decl.type_params)) labels
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| _ -> []
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(* Given a signature and a root path, prefix all idents in the signature
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by the root path and build the corresponding substitution. *)
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let rec prefix_idents root pos sub = function
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[] -> ([], sub)
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| Tsig_value(id, decl) :: rem ->
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let p = Pdot(root, Ident.name id, pos) in
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let (pl, final_sub) = prefix_idents root (pos+1) sub rem in
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(p::pl, final_sub)
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| Tsig_type(id, decl) :: rem ->
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let p = Pdot(root, Ident.name id, nopos) in
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let (pl, final_sub) =
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prefix_idents root pos (Subst.add_type id p sub) rem in
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(p::pl, final_sub)
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| Tsig_exception(id, decl) :: rem ->
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let p = Pdot(root, Ident.name id, pos) in
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let (pl, final_sub) = prefix_idents root (pos+1) sub rem in
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(p::pl, final_sub)
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| Tsig_module(id, mty) :: rem ->
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let p = Pdot(root, Ident.name id, pos) in
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let (pl, final_sub) =
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prefix_idents root (pos+1) (Subst.add_module id p sub) rem in
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(p::pl, final_sub)
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| Tsig_modtype(id, decl) :: rem ->
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let p = Pdot(root, Ident.name id, nopos) in
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let (pl, final_sub) =
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prefix_idents root pos
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(Subst.add_modtype id (Tmty_ident p) sub) rem in
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(p::pl, final_sub)
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(* Compute structure descriptions *)
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let rec components_of_module env path mty =
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let c =
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{ comp_values = Tbl.empty; comp_constrs = Tbl.empty;
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comp_labels = Tbl.empty; comp_types = Tbl.empty;
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comp_modules = Tbl.empty; comp_modtypes = Tbl.empty;
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comp_components = Tbl.empty } in
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begin match scrape_modtype mty env with
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Tmty_signature sg ->
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let (pl, sub) = prefix_idents path 0 Subst.identity sg in
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let env = ref env in
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let pos = ref 0 in
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List.iter2 (fun item path ->
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match item with
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Tsig_value(id, decl) ->
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let decl' = Subst.value_description sub decl in
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c.comp_values <-
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Tbl.add (Ident.name id) (decl', !pos) c.comp_values;
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incr pos
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| Tsig_type(id, decl) ->
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let decl' = Subst.type_declaration sub decl in
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c.comp_types <-
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Tbl.add (Ident.name id) (decl', nopos) c.comp_types;
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List.iter
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(fun (name, descr) ->
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c.comp_constrs <- Tbl.add name (descr, nopos) c.comp_constrs)
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(constructors_of_type path decl');
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List.iter
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(fun (name, descr) ->
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c.comp_labels <- Tbl.add name (descr, nopos) c.comp_labels)
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(labels_of_type path decl')
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| Tsig_exception(id, decl) ->
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let decl' = Subst.exception_declaration sub decl in
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let cstr = Datarepr.exception_descr path decl' in
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c.comp_constrs <-
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Tbl.add (Ident.name id) (cstr, !pos) c.comp_constrs;
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incr pos
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| Tsig_module(id, mty) ->
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let mty' = Subst.modtype sub mty in
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c.comp_modules <-
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Tbl.add (Ident.name id) (mty', !pos) c.comp_modules;
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let comps = components_of_module !env path mty' in
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c.comp_components <-
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Tbl.add (Ident.name id) (comps, !pos) c.comp_components;
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env := store_components id path comps !env;
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incr pos
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| Tsig_modtype(id, decl) ->
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let decl' = Subst.modtype_declaration sub decl in
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c.comp_modtypes <-
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Tbl.add (Ident.name id) (decl', nopos) c.comp_modtypes;
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env := store_modtype id path decl' !env)
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sg pl
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| _ -> ()
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end;
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c
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(* Insertion of bindings by identifier + path *)
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and store_value id path decl env =
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{ values = Ident.add id (path, decl) env.values;
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constrs = env.constrs;
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labels = env.labels;
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types = env.types;
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modules = env.modules;
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modtypes = env.modtypes;
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components = env.components }
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and store_type id path info env =
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{ values = env.values;
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constrs =
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List.fold_right
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(fun (name, descr) constrs ->
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Ident.add (Ident.new name) descr constrs)
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(constructors_of_type path info)
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env.constrs;
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labels =
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List.fold_right
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(fun (name, descr) labels ->
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Ident.add (Ident.new name) descr labels)
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(labels_of_type path info)
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env.labels;
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types = Ident.add id (path, info) env.types;
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modules = env.modules;
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modtypes = env.modtypes;
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components = env.components }
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and store_exception id path decl env =
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{ values = env.values;
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constrs = Ident.add id (Datarepr.exception_descr path decl) env.constrs;
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labels = env.labels;
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types = env.types;
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modules = env.modules;
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modtypes = env.modtypes;
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components = env.components }
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and store_module id path mty env =
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{ values = env.values;
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constrs = env.constrs;
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labels = env.labels;
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types = env.types;
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modules = Ident.add id (path, mty) env.modules;
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modtypes = env.modtypes;
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components = Ident.add id (path, components_of_module env path mty)
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env.components }
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and store_modtype id path info env =
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{ values = env.values;
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constrs = env.constrs;
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labels = env.labels;
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types = env.types;
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modules = env.modules;
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modtypes = Ident.add id (path, info) env.modtypes;
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components = env.components }
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and store_components id path comps env =
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{ values = env.values;
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constrs = env.constrs;
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labels = env.labels;
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types = env.types;
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modules = env.modules;
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modtypes = env.modtypes;
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components = Ident.add id (path, comps) env.components }
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(* Insertion of bindings by identifier *)
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let add_value id desc env =
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store_value id (Pident id) desc env
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and add_type id info env =
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store_type id (Pident id) info env
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and add_exception id decl env =
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store_exception id (Pident id) decl env
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and add_module id mty env =
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store_module id (Pident id) mty env
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and add_modtype id info env =
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store_modtype id (Pident id) info env
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(* Insertion of bindings by name *)
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let enter store_fun name data env =
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let id = Ident.new name in (id, store_fun id (Pident id) data env)
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let enter_value = enter store_value
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and enter_type = enter store_type
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and enter_exception = enter store_exception
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and enter_module = enter store_module
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and enter_modtype = enter store_modtype
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(* Insertion of all components of a signature *)
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let add_signature_component comp env =
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match comp with
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Tsig_value(id, decl) -> add_value id decl env
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| Tsig_type(id, decl) -> add_type id decl env
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| Tsig_exception(id, decl) -> add_exception id decl env
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| Tsig_module(id, mty) -> add_module id mty env
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| Tsig_modtype(id, decl) -> add_modtype id decl env
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let add_signature = List.fold_right add_signature_component
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(* Open a signature path *)
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let open_signature root sg env =
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(* First build the paths and substitution *)
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let (pl, sub) = prefix_idents root 0 Subst.identity sg in
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(* Then enter the components in the environment after substitution *)
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List.fold_left2
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(fun env item p ->
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match item with
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Tsig_value(id, decl) ->
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store_value (Ident.hide id) p
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(Subst.value_description sub decl) env
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| Tsig_type(id, decl) ->
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store_type (Ident.hide id) p
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(Subst.type_declaration sub decl) env
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| Tsig_exception(id, decl) ->
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store_exception (Ident.hide id) p
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(Subst.exception_declaration sub decl) env
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| Tsig_module(id, mty) ->
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store_module (Ident.hide id) p (Subst.modtype sub mty) env
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| Tsig_modtype(id, decl) ->
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store_modtype (Ident.hide id) p
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(Subst.modtype_declaration sub decl) env)
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env sg pl
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(* Open a signature from a file *)
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let open_pers_signature name env =
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let ps = find_pers_struct name in
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open_signature (Pident(Ident.new_persistent name)) ps.ps_sig env
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(* Read a signature from a file *)
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let read_signature modname filename =
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let (ps, crc) = read_pers_struct modname filename in (ps.ps_sig, crc)
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(* Save a signature to a file *)
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let save_signature sg modname filename =
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let ps =
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{ ps_name = modname;
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ps_sig = sg;
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ps_comps =
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components_of_module empty (Pident(Ident.new_persistent modname))
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(Tmty_signature sg) } in
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let oc = open_out_bin filename in
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output_string oc cmi_magic_number;
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output_value oc ps;
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flush oc;
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let pos = pos_out oc in
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let ic = open_in_bin filename in
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let crc = Crc.for_channel ic pos in
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close_in ic;
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output_binary_int oc crc;
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close_out oc;
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crc
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(* Make the initial environment *)
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let initial = Predef.build_initial_env add_type add_exception empty
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(* Return the list of imported interfaces with their CRCs *)
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let imported_units() = !imported_units
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(* Error report *)
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let report_error = function
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Not_an_interface filename ->
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print_string filename; print_space();
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print_string "is not a compiled interface."
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| Corrupted_interface filename ->
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print_string "Corrupted compiled interface"; print_space();
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print_string filename
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| Illegal_renaming(modname, filename) ->
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print_string filename; print_space();
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print_string "contains the compiled interface for"; print_space();
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print_string modname
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