273 lines
9.5 KiB
OCaml
273 lines
9.5 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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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Link a set of .cmx/.o files and produce an executable *)
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open Sys
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open Misc
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open Config
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open Compilenv
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type error =
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File_not_found of string
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| Not_an_object_file of string
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| Missing_implementations of string list
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| Inconsistent_interface of string * string * string
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| Inconsistent_implementation of string * string * string
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| Assembler_error of string
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| Linking_error
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exception Error of error
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(* Consistency check between interfaces and implementations *)
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let crc_interfaces =
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(Hashtbl.create 17 : (string, string * Digest.t) Hashtbl.t)
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let crc_implementations =
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(Hashtbl.create 17 : (string, string * Digest.t) Hashtbl.t)
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let check_consistency file_name unit crc =
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List.iter
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(fun (name, crc) ->
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try
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let (auth_name, auth_crc) = Hashtbl.find crc_interfaces name in
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if crc <> auth_crc then
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raise(Error(Inconsistent_interface(name, file_name, auth_name)))
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with Not_found ->
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(* Can only happen for unit for which only a .cmi file was used,
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but no .cmo is provided *)
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Hashtbl.add crc_interfaces name (file_name, crc))
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unit.ui_imports_cmi;
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Hashtbl.add crc_interfaces unit.ui_name (file_name, unit.ui_interface);
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List.iter
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(fun (name, crc) ->
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if crc <> cmx_not_found_crc then begin
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try
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let (auth_name, auth_crc) = Hashtbl.find crc_implementations name in
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if crc <> auth_crc then
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raise(Error(Inconsistent_implementation(name, file_name, auth_name)))
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with Not_found ->
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Hashtbl.add crc_implementations name (file_name, crc)
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end)
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unit.ui_imports_cmx;
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Hashtbl.add crc_implementations unit.ui_name (file_name, crc)
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(* First pass: determine which units are needed *)
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module StringSet =
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Set.Make(struct
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type t = string
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let compare = compare
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end)
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let missing_globals = ref StringSet.empty
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let is_required name =
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StringSet.mem name !missing_globals
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let add_required (name, crc) =
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missing_globals := StringSet.add name !missing_globals
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let remove_required name =
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missing_globals := StringSet.remove name !missing_globals
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let scan_file obj_name tolink =
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let file_name =
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try
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find_in_path !load_path obj_name
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with Not_found ->
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raise(Error(File_not_found obj_name)) in
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if Filename.check_suffix file_name ".cmx" then begin
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(* This is a .cmx file. It must be linked in any case.
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Read the infos to see which modules it requires. *)
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let (info, crc) = Compilenv.read_unit_info file_name in
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check_consistency file_name info crc;
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remove_required info.ui_name;
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List.iter add_required info.ui_imports_cmx;
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info :: tolink
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end
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else if Filename.check_suffix file_name ".cmxa" then begin
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(* This is an archive file. Each unit contained in it will be linked
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in only if needed. *)
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let ic = open_in_bin file_name in
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let buffer = String.create (String.length cmxa_magic_number) in
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really_input ic buffer 0 (String.length cmxa_magic_number);
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if buffer <> cmxa_magic_number then
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raise(Error(Not_an_object_file file_name));
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let info_crc_list = (input_value ic : (unit_infos * Digest.t) list) in
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close_in ic;
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List.fold_right
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(fun (info, crc) reqd ->
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if info.ui_force_link
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or !Clflags.link_everything
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or is_required info.ui_name then begin
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check_consistency file_name info crc;
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remove_required info.ui_name;
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List.iter add_required info.ui_imports_cmx;
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info :: reqd
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end else
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reqd)
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info_crc_list tolink
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end
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else raise(Error(Not_an_object_file file_name))
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(* Second pass: generate the startup file and link it with everything else *)
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module IntSet = Set.Make(
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struct
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type t = int
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let compare = compare
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end)
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let make_startup_file filename info_list =
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let oc = open_out filename in
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Emitaux.output_channel := oc;
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Location.input_name := "startup"; (* set the name of the "current" input *)
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Compilenv.reset "startup" ""; (* set the name of the "current" compunit *)
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Emit.begin_assembly();
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let name_list = List.map (fun ui -> ui.ui_name) info_list in
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Asmgen.compile_phrase(Cmmgen.entry_point name_list);
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let apply_functions = ref (IntSet.add 2 (IntSet.add 3 IntSet.empty)) in
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(* The callback functions always reference caml_apply[23] *)
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let curry_functions =
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ref IntSet.empty in
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List.iter
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(fun info ->
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List.iter
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(fun n -> apply_functions := IntSet.add n !apply_functions)
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info.ui_apply_fun;
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List.iter
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(fun n -> curry_functions := IntSet.add n !curry_functions)
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info.ui_curry_fun)
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info_list;
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IntSet.iter
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(fun n -> Asmgen.compile_phrase(Cmmgen.apply_function n))
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!apply_functions;
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IntSet.iter
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(fun n -> List.iter Asmgen.compile_phrase (Cmmgen.curry_function n))
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!curry_functions;
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Array.iter
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(fun name -> Asmgen.compile_phrase(Cmmgen.predef_exception name))
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Runtimedef.builtin_exceptions;
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Asmgen.compile_phrase(Cmmgen.global_table name_list);
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Asmgen.compile_phrase(Cmmgen.data_segment_table name_list);
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Asmgen.compile_phrase
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(Cmmgen.frame_table("startup" :: "system" :: name_list));
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Emit.end_assembly();
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close_out oc
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let call_linker file_list startup_file =
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let libname = "libasmrun" ^ ext_lib in
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let runtime_lib =
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try
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find_in_path !load_path libname
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with Not_found ->
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raise(Error(File_not_found libname)) in
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let cmd =
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match Config.system with
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"win32" ->
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Printf.sprintf
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"%s /Fe%s -I%s %s %s %s %s %s %s"
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Config.native_c_compiler
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!Clflags.exec_name
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Config.standard_library
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(String.concat " " (List.rev !Clflags.ccopts))
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startup_file
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(String.concat " " (List.rev file_list))
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(String.concat " " (List.rev !Clflags.ccobjs))
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runtime_lib
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Config.c_libraries
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| _ ->
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Printf.sprintf
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"%s -o %s -I%s %s %s %s -L%s %s %s %s"
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Config.native_c_compiler
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!Clflags.exec_name
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Config.standard_library
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(String.concat " " (List.rev !Clflags.ccopts))
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startup_file
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(String.concat " " (List.rev file_list))
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Config.standard_library
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(String.concat " " (List.rev !Clflags.ccobjs))
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runtime_lib
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Config.c_libraries in
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if Sys.command cmd <> 0 then raise(Error Linking_error)
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let object_file_name name =
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let file_name =
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try
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find_in_path !load_path name
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with Not_found ->
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fatal_error "Asmlink.object_file_name: not found" in
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if Filename.check_suffix file_name ".cmx" then
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Filename.chop_suffix file_name ".cmx" ^ ext_obj
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else if Filename.check_suffix file_name ".cmxa" then
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Filename.chop_suffix file_name ".cmxa" ^ ext_lib
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else
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fatal_error "Asmlink.object_file_name: bad ext"
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(* Main entry point *)
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let link objfiles =
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let objfiles = "stdlib.cmxa" :: (objfiles @ ["std_exit.cmx"]) in
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let units_tolink = List.fold_right scan_file objfiles [] in
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Array.iter remove_required Runtimedef.builtin_exceptions;
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if not (StringSet.is_empty !missing_globals) then
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raise(Error(Missing_implementations(StringSet.elements !missing_globals)));
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let startup = Filename.temp_file "camlstartup" ext_asm in
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make_startup_file startup units_tolink;
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let startup_obj = Filename.temp_file "camlstartup" ext_obj in
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if Proc.assemble_file startup startup_obj <> 0 then
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raise(Error(Assembler_error startup));
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try
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call_linker (List.map object_file_name objfiles) startup_obj;
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if not !Clflags.keep_startup_file then remove_file startup;
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remove_file startup_obj
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with x ->
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remove_file startup_obj;
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raise x
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(* Error report *)
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open Format
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let report_error = function
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File_not_found name ->
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print_string "Cannot find file "; print_string name
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| Not_an_object_file name ->
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print_string "The file "; print_string name;
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print_string " is not a compilation unit description"
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| Missing_implementations l ->
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open_hovbox 0;
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print_string
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"No implementation(s) provided for the following module(s):";
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List.iter (fun s -> print_space(); print_string s) l;
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close_box()
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| Inconsistent_interface(intf, file1, file2) ->
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open_hvbox 0;
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print_string "Files "; print_string file1; print_string " and ";
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print_string file2; print_space();
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print_string "make inconsistent assumptions over interface ";
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print_string intf;
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close_box()
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| Inconsistent_implementation(intf, file1, file2) ->
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open_hvbox 0;
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print_string "Files "; print_string file1; print_string " and ";
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print_string file2; print_space();
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print_string "make inconsistent assumptions over implementation ";
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print_string intf;
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close_box()
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| Assembler_error file ->
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print_string "Error while assembling "; print_string file
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| Linking_error ->
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print_string "Error during linking"
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