/usr/lib/ocaml/plugin-loader/PluginLoader.ml is in liboasis-ocaml-dev 0.3.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(* OASIS: architecture for building OCaml libraries and applications *)
(* *)
(* Copyright (C) 2008-2010, OCamlCore SARL *)
(* *)
(* This library is free software; 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; either version 2.1 of the License, or (at *)
(* your option) any later version, with the OCaml static compilation *)
(* exception. *)
(* *)
(* This library 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 file COPYING for more *)
(* details. *)
(* *)
(* You should have received a copy of the GNU Lesser General Public License *)
(* along with this library; if not, write to the Free Software Foundation, *)
(* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *)
(******************************************************************************)
(* The content of this file started with ocsigen_loader.ml
* from the ocsigen project (http://www.ocsigen.org).
*
* It was:
* Copyright (C) 2008 Stéphane Glondu
*)
exception Dynlink_error of string * exn
exception Findlib_error of string * exn
exception Plugin_not_found of string
(**/**)
(** TODO: Gettext related functions, to be replaced by real ones. *)
let s_ s = s
let f_ fmt = ""^^fmt
(**/**)
(* Error formatting *)
open Printf
let () =
Printexc.register_printer
(function
| Dynlink_error (s, Dynlink.Error e) ->
Some
(sprintf (f_ "Dynlink error while loading '%s': %s")
s (Dynlink.error_message e))
| Findlib_error (s, Fl_package_base.No_such_package (s', msg)) ->
let pkg =
if s = s' then
"'"^s^"'"
else
sprintf (f_ "'%s' [while trying to load '%s']") s' s
in
let additional =
if msg = "" then "" else sprintf " (%s)" msg
in
Some
(sprintf (f_ "Findlib package %s not found%s")
pkg additional)
| Findlib_error (s, e) ->
Some (sprintf "Findlib error while handling '%s': %s"
s (Printexc.to_string e))
| Plugin_not_found nm ->
Some (sprintf (f_ "Plugin '%s' not found") nm)
| _ ->
None);
module StringSet = Set.Make(String)
(* Loading files *)
module SetString = Set.Make(String)
let findlib_packages_loaded = ref SetString.empty
let add_findlib_package e =
findlib_packages_loaded := SetString.add e !findlib_packages_loaded
let init findlib_packages_loaded =
List.iter add_findlib_package findlib_packages_loaded;
Findlib.init ()
type 'a t =
{
system: string;
msg: ([>`Debug | `Warning | `Error] as 'a) -> string -> unit;
}
type entry =
{
findlib_name: string;
name: string;
synopsis: string option;
description: string option;
version: string option;
}
(* Using Findlib to locate files *)
let findfiles t package =
let rev_split_blank str =
let buf = Buffer.create 13 in
let lst = ref [] in
String.iter
(function
| ' ' ->
if Buffer.length buf > 0 then
begin
lst := Buffer.contents buf :: !lst;
Buffer.clear buf
end
| c ->
Buffer.add_char buf c)
str;
begin
match Buffer.contents buf with
| "" -> ()
| str -> lst := str :: !lst
end;
!lst
in
try
let preds =
[if Dynlink.is_native then "native" else "byte"]
in
let deps =
List.filter
(fun a -> not (SetString.mem a !findlib_packages_loaded))
(Findlib.package_deep_ancestors preds [package])
in
t.msg
`Debug
(sprintf
(f_ "Dependencies of %s: %s")
package (String.concat ", " deps));
let rec aux =
function
| [] -> []
| a :: tl ->
let mods =
try
let raw =
Findlib.package_property ("plugin" :: preds) a "archive"
in
List.rev (rev_split_blank raw)
with Not_found ->
begin
try
let raw = Findlib.package_property preds a "archive" in
List.rev_map
(fun fn ->
(* Replacing .cmx/.cmxa by .cmxs *)
if Dynlink.is_native &&
(Filename.check_suffix fn "cmx" ||
Filename.check_suffix fn "cmxa") then
(Filename.chop_extension fn) ^ ".cmxs"
else
fn)
(rev_split_blank raw)
with Not_found ->
begin
t.msg `Error
(sprintf
(f_ "Cannot find 'archive' attribute for findlib \
package %s")
a);
[]
end
end
in
let base = Findlib.package_directory a in
add_findlib_package a;
(List.map (Findlib.resolve_path ~base) mods) @ (aux tl)
in
let res = aux deps in
t.msg `Debug (sprintf "Object files needed: %s"
(String.concat ", " res));
res
with e ->
raise (Findlib_error (package, e))
module SetEntry =
Set.Make
(struct
type t = entry
let compare e1 e2 =
String.compare e1.name e2.name
end)
let list t =
let lst = Fl_package_base.list_packages () in
let set =
List.fold_left
(fun acc pkg_str ->
try
let pkg = Fl_package_base.query pkg_str in
let package_defs = pkg.Fl_package_base.package_defs in
let plugin_system =
Fl_metascanner.lookup "plugin_system" [] package_defs
in
let default_lookup var =
try
Some (Fl_metascanner.lookup var [] package_defs)
with Not_found ->
None
in
let default_lookup_str var dflt =
match default_lookup var with
| Some str -> str
| None -> dflt
in
if plugin_system = t.system then
begin
let entry =
{
findlib_name = pkg_str;
name = default_lookup_str "plugin_name" pkg_str;
synopsis = default_lookup "plugin_synopsis";
description = default_lookup "plugin_description";
version = default_lookup "version";
}
in
if SetEntry.mem entry acc then
t.msg `Warning
(sprintf
(f_ "Plugin '%s' already defined \
(findlib name: %s; directory: '%s').")
entry.name
pkg_str
pkg.Fl_package_base.package_dir);
SetEntry.add entry acc
end
else
acc
with e ->
acc)
SetEntry.empty
lst
in
SetEntry.elements set
let load t nm =
let entry =
try
List.find (fun e -> e.name = nm) (list t)
with Not_found ->
raise (Plugin_not_found nm)
in
let lst =
findfiles t entry.findlib_name
in
try
List.iter Dynlink.loadfile lst
with e ->
raise (Dynlink_error (nm, e))
|