302 lines
8.4 KiB
OCaml
302 lines
8.4 KiB
OCaml
(***********************************************************************)
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(* *)
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(* OCaml *)
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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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(* Compilation environments for compilation units *)
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open Config
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open Misc
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open Clambda
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open Cmx_format
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type error =
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Not_a_unit_info of string
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| Corrupted_unit_info of string
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| Illegal_renaming of string * string * string
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exception Error of error
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let global_infos_table =
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(Hashtbl.create 17 : (string, unit_infos option) Hashtbl.t)
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module CstMap =
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Map.Make(struct
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type t = Clambda.ustructured_constant
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let compare = Pervasives.compare
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(* could use a better version, comparing on the
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first arg of Uconst_ref *)
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end)
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type structured_constants =
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{
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strcst_shared: string CstMap.t;
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strcst_all: (string * Clambda.ustructured_constant) list;
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}
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let structured_constants_empty =
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{
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strcst_shared = CstMap.empty;
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strcst_all = [];
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}
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let structured_constants = ref structured_constants_empty
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let exported_constants = Hashtbl.create 17
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let current_unit =
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{ ui_name = "";
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ui_symbol = "";
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ui_defines = [];
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ui_imports_cmi = [];
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ui_imports_cmx = [];
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ui_approx = Value_unknown;
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ui_curry_fun = [];
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ui_apply_fun = [];
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ui_send_fun = [];
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ui_force_link = false }
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let symbolname_for_pack pack name =
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match pack with
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| None -> name
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| Some p ->
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let b = Buffer.create 64 in
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for i = 0 to String.length p - 1 do
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match p.[i] with
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| '.' -> Buffer.add_string b "__"
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| c -> Buffer.add_char b c
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done;
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Buffer.add_string b "__";
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Buffer.add_string b name;
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Buffer.contents b
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let reset ?packname name =
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Hashtbl.clear global_infos_table;
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let symbol = symbolname_for_pack packname name in
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current_unit.ui_name <- name;
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current_unit.ui_symbol <- symbol;
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current_unit.ui_defines <- [symbol];
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current_unit.ui_imports_cmi <- [];
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current_unit.ui_imports_cmx <- [];
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current_unit.ui_curry_fun <- [];
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current_unit.ui_apply_fun <- [];
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current_unit.ui_send_fun <- [];
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current_unit.ui_force_link <- false;
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Hashtbl.clear exported_constants;
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structured_constants := structured_constants_empty
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let current_unit_infos () =
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current_unit
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let current_unit_name () =
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current_unit.ui_name
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let make_symbol ?(unitname = current_unit.ui_symbol) idopt =
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let prefix = "caml" ^ unitname in
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match idopt with
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| None -> prefix
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| Some id -> prefix ^ "__" ^ id
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let symbol_in_current_unit name =
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let prefix = "caml" ^ current_unit.ui_symbol in
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name = prefix ||
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(let lp = String.length prefix in
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String.length name >= 2 + lp
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&& String.sub name 0 lp = prefix
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&& name.[lp] = '_'
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&& name.[lp + 1] = '_')
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let read_unit_info filename =
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let ic = open_in_bin filename in
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try
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let buffer = really_input_string ic (String.length cmx_magic_number) in
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if buffer <> cmx_magic_number then begin
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close_in ic;
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raise(Error(Not_a_unit_info filename))
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end;
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let ui = (input_value ic : unit_infos) in
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let crc = Digest.input ic in
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close_in ic;
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(ui, crc)
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with End_of_file | Failure _ ->
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close_in ic;
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raise(Error(Corrupted_unit_info(filename)))
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let read_library_info filename =
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let ic = open_in_bin filename in
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let buffer = really_input_string ic (String.length cmxa_magic_number) in
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if buffer <> cmxa_magic_number then
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raise(Error(Not_a_unit_info filename));
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let infos = (input_value ic : library_infos) in
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close_in ic;
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infos
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(* Read and cache info on global identifiers *)
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let get_global_info global_ident = (
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let modname = Ident.name global_ident in
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if modname = current_unit.ui_name then
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Some current_unit
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else begin
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try
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Hashtbl.find global_infos_table modname
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with Not_found ->
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let (infos, crc) =
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try
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let filename =
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find_in_path_uncap !load_path (modname ^ ".cmx") in
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let (ui, crc) = read_unit_info filename in
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if ui.ui_name <> modname then
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raise(Error(Illegal_renaming(modname, ui.ui_name, filename)));
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(Some ui, Some crc)
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with Not_found ->
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(None, None) in
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current_unit.ui_imports_cmx <-
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(modname, crc) :: current_unit.ui_imports_cmx;
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Hashtbl.add global_infos_table modname infos;
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infos
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end
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)
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let cache_unit_info ui =
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Hashtbl.add global_infos_table ui.ui_name (Some ui)
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(* Return the approximation of a global identifier *)
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let toplevel_approx = Hashtbl.create 16
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let record_global_approx_toplevel id =
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Hashtbl.add toplevel_approx current_unit.ui_name current_unit.ui_approx
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let global_approx id =
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if Ident.is_predef_exn id then Value_unknown
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else try Hashtbl.find toplevel_approx (Ident.name id)
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with Not_found ->
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match get_global_info id with
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| None -> Value_unknown
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| Some ui -> ui.ui_approx
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(* Return the symbol used to refer to a global identifier *)
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let symbol_for_global id =
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if Ident.is_predef_exn id then
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"caml_exn_" ^ Ident.name id
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else begin
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match get_global_info id with
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| None -> make_symbol ~unitname:(Ident.name id) None
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| Some ui -> make_symbol ~unitname:ui.ui_symbol None
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end
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(* Register the approximation of the module being compiled *)
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let set_global_approx approx =
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current_unit.ui_approx <- approx
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(* Record that a currying function or application function is needed *)
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let need_curry_fun n =
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if not (List.mem n current_unit.ui_curry_fun) then
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current_unit.ui_curry_fun <- n :: current_unit.ui_curry_fun
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let need_apply_fun n =
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if not (List.mem n current_unit.ui_apply_fun) then
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current_unit.ui_apply_fun <- n :: current_unit.ui_apply_fun
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let need_send_fun n =
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if not (List.mem n current_unit.ui_send_fun) then
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current_unit.ui_send_fun <- n :: current_unit.ui_send_fun
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(* Write the description of the current unit *)
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let write_unit_info info filename =
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let oc = open_out_bin filename in
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output_string oc cmx_magic_number;
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output_value oc info;
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flush oc;
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let crc = Digest.file filename in
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Digest.output oc crc;
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close_out oc
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let save_unit_info filename =
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current_unit.ui_imports_cmi <- Env.imports();
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write_unit_info current_unit filename
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let const_label = ref 0
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let new_const_label () =
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incr const_label;
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!const_label
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let new_const_symbol () =
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incr const_label;
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make_symbol (Some (string_of_int !const_label))
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let snapshot () = !structured_constants
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let backtrack s = structured_constants := s
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let new_structured_constant cst ~shared =
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let {strcst_shared; strcst_all} = !structured_constants in
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if shared then
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try
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CstMap.find cst strcst_shared
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with Not_found ->
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let lbl = new_const_symbol() in
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structured_constants :=
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{
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strcst_shared = CstMap.add cst lbl strcst_shared;
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strcst_all = (lbl, cst) :: strcst_all;
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};
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lbl
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else
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let lbl = new_const_symbol() in
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structured_constants :=
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{
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strcst_shared;
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strcst_all = (lbl, cst) :: strcst_all;
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};
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lbl
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let add_exported_constant s =
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Hashtbl.replace exported_constants s ()
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let structured_constants () =
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List.map
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(fun (lbl, cst) ->
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(lbl, Hashtbl.mem exported_constants lbl, cst)
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) (!structured_constants).strcst_all
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(* Error report *)
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open Format
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let report_error ppf = function
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| Not_a_unit_info filename ->
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fprintf ppf "%a@ is not a compilation unit description."
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Location.print_filename filename
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| Corrupted_unit_info filename ->
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fprintf ppf "Corrupted compilation unit description@ %a"
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Location.print_filename filename
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| Illegal_renaming(name, modname, filename) ->
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fprintf ppf "%a@ contains the description for unit\
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@ %s when %s was expected"
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Location.print_filename filename name modname
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let () =
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Location.register_error_of_exn
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(function
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| Error err -> Some (Location.error_of_printer_file report_error err)
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| _ -> None
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)
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