249 lines
8.4 KiB
OCaml
249 lines
8.4 KiB
OCaml
(***********************************************************************)
|
|
(* *)
|
|
(* Objective Caml *)
|
|
(* *)
|
|
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
|
|
(* *)
|
|
(* Copyright 1996 Institut National de Recherche en Informatique et *)
|
|
(* en Automatique. All rights reserved. This file is distributed *)
|
|
(* under the terms of the GNU Library General Public License, with *)
|
|
(* the special exception on linking described in file ../../LICENSE. *)
|
|
(* *)
|
|
(***********************************************************************)
|
|
|
|
(* $Id$ *)
|
|
|
|
(* Dynamic loading of .cmo files *)
|
|
|
|
open Emitcode
|
|
|
|
type linking_error =
|
|
Undefined_global of string
|
|
| Unavailable_primitive of string
|
|
| Uninitialized_global of string
|
|
|
|
type error =
|
|
Not_a_bytecode_file of string
|
|
| Inconsistent_import of string
|
|
| Unavailable_unit of string
|
|
| Unsafe_file
|
|
| Linking_error of string * linking_error
|
|
| Corrupted_interface of string
|
|
| File_not_found of string
|
|
| Cannot_open_dll of string
|
|
|
|
exception Error of error
|
|
|
|
(* Management of interface CRCs *)
|
|
|
|
let crc_interfaces = ref (Consistbl.create ())
|
|
let allow_extension = ref true
|
|
|
|
(* Check that the object file being loaded has been compiled against
|
|
the same interfaces as the program itself. In addition, check that
|
|
only authorized compilation units are referenced. *)
|
|
|
|
let check_consistency file_name cu =
|
|
try
|
|
List.iter
|
|
(fun (name, crc) ->
|
|
if name = cu.cu_name then
|
|
Consistbl.set !crc_interfaces name crc file_name
|
|
else if !allow_extension then
|
|
Consistbl.check !crc_interfaces name crc file_name
|
|
else
|
|
Consistbl.check_noadd !crc_interfaces name crc file_name)
|
|
cu.cu_imports
|
|
with Consistbl.Inconsistency(name, user, auth) ->
|
|
raise(Error(Inconsistent_import name))
|
|
| Consistbl.Not_available(name) ->
|
|
raise(Error(Unavailable_unit name))
|
|
|
|
(* Empty the crc_interfaces table *)
|
|
|
|
let clear_available_units () =
|
|
Consistbl.clear !crc_interfaces;
|
|
allow_extension := false
|
|
|
|
(* Allow only access to the units with the given names *)
|
|
|
|
let allow_only names =
|
|
Consistbl.filter (fun name -> List.mem name names) !crc_interfaces;
|
|
allow_extension := false
|
|
|
|
(* Prohibit access to the units with the given names *)
|
|
|
|
let prohibit names =
|
|
Consistbl.filter (fun name -> not (List.mem name names)) !crc_interfaces;
|
|
allow_extension := false
|
|
|
|
(* Initialize the crc_interfaces table with a list of units with fixed CRCs *)
|
|
|
|
let add_available_units units =
|
|
List.iter (fun (unit, crc) -> Consistbl.set !crc_interfaces unit crc "")
|
|
units
|
|
|
|
(* Default interface CRCs: those found in the current executable *)
|
|
let default_crcs = ref []
|
|
|
|
let default_available_units () =
|
|
clear_available_units();
|
|
add_available_units !default_crcs;
|
|
allow_extension := true
|
|
|
|
(* Initialize the linker tables and everything *)
|
|
|
|
let init () =
|
|
default_crcs := Symtable.init_toplevel();
|
|
default_available_units ()
|
|
|
|
(* Read the CRC of an interface from its .cmi file *)
|
|
|
|
let digest_interface unit loadpath =
|
|
let filename =
|
|
let shortname = unit ^ ".cmi" in
|
|
try
|
|
Misc.find_in_path_uncap loadpath shortname
|
|
with Not_found ->
|
|
raise (Error(File_not_found shortname)) in
|
|
let ic = open_in_bin filename in
|
|
try
|
|
let buffer = String.create (String.length Config.cmi_magic_number) in
|
|
really_input ic buffer 0 (String.length Config.cmi_magic_number);
|
|
if buffer <> Config.cmi_magic_number then begin
|
|
close_in ic;
|
|
raise(Error(Corrupted_interface filename))
|
|
end;
|
|
ignore (input_value ic);
|
|
let crc =
|
|
match input_value ic with
|
|
(_, crc) :: _ -> crc
|
|
| _ -> raise(Error(Corrupted_interface filename))
|
|
in
|
|
close_in ic;
|
|
crc
|
|
with End_of_file | Failure _ ->
|
|
close_in ic;
|
|
raise(Error(Corrupted_interface filename))
|
|
|
|
(* Initialize the crc_interfaces table with a list of units.
|
|
Their CRCs are read from their interfaces. *)
|
|
|
|
let add_interfaces units loadpath =
|
|
add_available_units
|
|
(List.map (fun unit -> (unit, digest_interface unit loadpath)) units)
|
|
|
|
(* Check whether the object file being loaded was compiled in unsafe mode *)
|
|
|
|
let unsafe_allowed = ref false
|
|
|
|
let allow_unsafe_modules b =
|
|
unsafe_allowed := b
|
|
|
|
let check_unsafe_module cu =
|
|
if (not !unsafe_allowed) && cu.cu_primitives <> []
|
|
then raise(Error(Unsafe_file))
|
|
|
|
(* Load in-core and execute a bytecode object file *)
|
|
|
|
let load_compunit ic file_name compunit =
|
|
check_consistency file_name compunit;
|
|
check_unsafe_module compunit;
|
|
seek_in ic compunit.cu_pos;
|
|
let code_size = compunit.cu_codesize + 8 in
|
|
let code = Meta.static_alloc code_size in
|
|
unsafe_really_input ic code 0 compunit.cu_codesize;
|
|
String.unsafe_set code compunit.cu_codesize (Char.chr Opcodes.opRETURN);
|
|
String.unsafe_set code (compunit.cu_codesize + 1) '\000';
|
|
String.unsafe_set code (compunit.cu_codesize + 2) '\000';
|
|
String.unsafe_set code (compunit.cu_codesize + 3) '\000';
|
|
String.unsafe_set code (compunit.cu_codesize + 4) '\001';
|
|
String.unsafe_set code (compunit.cu_codesize + 5) '\000';
|
|
String.unsafe_set code (compunit.cu_codesize + 6) '\000';
|
|
String.unsafe_set code (compunit.cu_codesize + 7) '\000';
|
|
let initial_symtable = Symtable.current_state() in
|
|
begin try
|
|
Symtable.patch_object code compunit.cu_reloc;
|
|
Symtable.check_global_initialized compunit.cu_reloc;
|
|
Symtable.update_global_table()
|
|
with Symtable.Error error ->
|
|
let new_error =
|
|
match error with
|
|
Symtable.Undefined_global s -> Undefined_global s
|
|
| Symtable.Unavailable_primitive s -> Unavailable_primitive s
|
|
| Symtable.Uninitialized_global s -> Uninitialized_global s
|
|
| _ -> assert false in
|
|
raise(Error(Linking_error (file_name, new_error)))
|
|
end;
|
|
begin try
|
|
ignore((Meta.reify_bytecode code code_size) ())
|
|
with exn ->
|
|
Symtable.restore_state initial_symtable;
|
|
raise exn
|
|
end
|
|
|
|
let loadfile file_name =
|
|
let ic = open_in_bin file_name in
|
|
try
|
|
let buffer = String.create (String.length Config.cmo_magic_number) in
|
|
really_input ic buffer 0 (String.length Config.cmo_magic_number);
|
|
if buffer = Config.cmo_magic_number then begin
|
|
let compunit_pos = input_binary_int ic in (* Go to descriptor *)
|
|
seek_in ic compunit_pos;
|
|
load_compunit ic file_name (input_value ic : compilation_unit)
|
|
end else
|
|
if buffer = Config.cma_magic_number then begin
|
|
let toc_pos = input_binary_int ic in (* Go to table of contents *)
|
|
seek_in ic toc_pos;
|
|
let lib = (input_value ic : library) in
|
|
begin try
|
|
Dll.open_dlls (List.map Dll.extract_dll_name lib.lib_dllibs)
|
|
with Failure reason ->
|
|
raise(Error(Cannot_open_dll reason))
|
|
end;
|
|
List.iter (load_compunit ic file_name) lib.lib_units
|
|
end else
|
|
raise(Error(Not_a_bytecode_file file_name));
|
|
close_in ic
|
|
with exc ->
|
|
close_in ic; raise exc
|
|
|
|
let loadfile_private file_name =
|
|
let initial_symtable = Symtable.current_state()
|
|
and initial_crc = !crc_interfaces in
|
|
try
|
|
loadfile file_name;
|
|
Symtable.hide_additions initial_symtable;
|
|
crc_interfaces := initial_crc
|
|
with exn ->
|
|
Symtable.hide_additions initial_symtable;
|
|
crc_interfaces := initial_crc;
|
|
raise exn
|
|
|
|
(* Error report *)
|
|
|
|
let error_message = function
|
|
Not_a_bytecode_file name ->
|
|
name ^ " is not a bytecode object file"
|
|
| Inconsistent_import name ->
|
|
"interface mismatch on " ^ name
|
|
| Unavailable_unit name ->
|
|
"no implementation available for " ^ name
|
|
| Unsafe_file ->
|
|
"this object file uses unsafe features"
|
|
| Linking_error (name, Undefined_global s) ->
|
|
"error while linking " ^ name ^ ".\n" ^
|
|
"Reference to undefined global `" ^ s ^ "'"
|
|
| Linking_error (name, Unavailable_primitive s) ->
|
|
"error while linking " ^ name ^ ".\n" ^
|
|
"The external function `" ^ s ^ "' is not available"
|
|
| Linking_error (name, Uninitialized_global s) ->
|
|
"error while linking " ^ name ^ ".\n" ^
|
|
"The module `" ^ s ^ "' is not yet initialized"
|
|
| Corrupted_interface name ->
|
|
"corrupted interface file " ^ name
|
|
| File_not_found name ->
|
|
"cannot find file " ^ name ^ " in search path"
|
|
| Cannot_open_dll reason ->
|
|
"error loading shared library: " ^ reason
|