230 lines
7.3 KiB
OCaml
230 lines
7.3 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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(* The interactive toplevel loop *)
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open Lexing
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open Format
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open Config
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open Misc
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open Parsetree
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open Types
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open Typedtree
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open Printval
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type directive_fun =
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Directive_none of (unit -> unit)
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| Directive_string of (string -> unit)
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| Directive_int of (int -> unit)
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| Directive_ident of (Longident.t -> unit)
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(* Load in-core and execute a lambda term *)
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type evaluation_outcome = Result of Obj.t | Exception of exn
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let load_lambda lam =
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if !Clflags.dump_rawlambda then begin
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Printlambda.lambda lam; print_newline()
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end;
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let slam = Simplif.simplify_lambda lam in
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if !Clflags.dump_lambda then begin
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Printlambda.lambda slam; print_newline()
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end;
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let (init_code, fun_code) = Bytegen.compile_phrase slam in
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if !Clflags.dump_instr then begin
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Printinstr.instrlist init_code;
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Printinstr.instrlist fun_code;
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print_newline()
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end;
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let (code, code_size, reloc) = Emitcode.to_memory init_code fun_code in
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let can_free = (fun_code = []) in
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let initial_symtable = Symtable.current_state() in
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Symtable.patch_object code reloc;
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Symtable.update_global_table();
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try
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let retval = (Meta.reify_bytecode code code_size) () in
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if can_free then Meta.static_free code;
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Result retval
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with x ->
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if can_free then Meta.static_free code;
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Symtable.restore_state initial_symtable;
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Exception x
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(* Print the outcome of an evaluation *)
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let rec print_items env = function
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Tsig_value(id, decl)::rem ->
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open_box 2;
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begin match decl.val_kind with
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Val_prim p ->
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print_string "external "; Printtyp.ident id;
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print_string " :"; print_space();
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Printtyp.type_scheme decl.val_type; print_space();
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print_string "= "; Primitive.print_description p
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| _ ->
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print_string "val "; Printtyp.ident id;
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print_string " :"; print_space();
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Printtyp.type_scheme decl.val_type;
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print_string " ="; print_space();
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print_value env (Symtable.get_global_value id) decl.val_type
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end;
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close_box();
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print_space (); print_items env rem
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| Tsig_type(id, decl)::rem ->
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Printtyp.type_declaration id decl;
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print_space (); print_items env rem
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| Tsig_exception(id, decl)::rem ->
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Printtyp.exception_declaration id decl;
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print_space (); print_items env rem
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| Tsig_module(id, mty)::rem ->
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open_box 2; print_string "module "; Printtyp.ident id;
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print_string " :"; print_space(); Printtyp.modtype mty; close_box();
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print_space (); print_items env rem
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| Tsig_modtype(id, decl)::rem ->
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Printtyp.modtype_declaration id decl;
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print_space (); print_items env rem
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| Tsig_class(id, decl)::tydecl1::tydecl2::rem ->
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Printtyp.class_type id decl;
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print_space (); print_items env rem
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| _ ->
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()
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(* Print an exception produced by an evaluation *)
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let print_exception_outcome = function
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Sys.Break ->
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print_string "Interrupted."; print_newline()
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| Out_of_memory ->
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Gc.full_major();
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print_string "Out of memory during evaluation";
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print_newline()
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| exn ->
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open_box 0;
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print_string "Uncaught exception: ";
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print_exception (Obj.repr exn);
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print_newline()
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(* The table of toplevel directives.
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Filled by functions from module topdirs. *)
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let directive_table = (Hashtbl.create 13 : (string, directive_fun) Hashtbl.t)
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(* Execute a toplevel phrase *)
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let toplevel_env = ref Env.empty
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let execute_phrase phr =
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match phr with
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Ptop_def sstr ->
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let (str, sg, newenv) = Typemod.type_structure !toplevel_env sstr in
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let lam = Translmod.transl_toplevel_definition str in
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let res = load_lambda lam in
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begin match res with
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Result v ->
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begin match str with
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[Tstr_eval exp] ->
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open_box 0;
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print_string "- : ";
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Printtyp.type_scheme exp.exp_type;
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print_space(); print_string "="; print_space();
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print_value newenv v exp.exp_type;
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close_box();
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print_newline()
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| _ ->
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open_vbox 0;
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print_items newenv sg;
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close_box();
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print_flush()
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end;
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toplevel_env := newenv;
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true
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| Exception exn ->
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print_exception_outcome exn;
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false
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end
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| Ptop_dir(dir_name, dir_arg) ->
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try
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match (Hashtbl.find directive_table dir_name, dir_arg) with
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(Directive_none f, Pdir_none) -> f (); true
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| (Directive_string f, Pdir_string s) -> f s; true
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| (Directive_int f, Pdir_int n) -> f n; true
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| (Directive_ident f, Pdir_ident lid) -> f lid; true
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| (_, _) ->
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print_string "Wrong type of argument for directive `";
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print_string dir_name; print_string "'"; print_newline();
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false
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with Not_found ->
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print_string "Unknown directive `"; print_string dir_name;
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print_string "'"; print_newline();
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false
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(* Reading function *)
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external input_scan_line : in_channel -> int = "input_scan_line"
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let first_line = ref true
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let refill_lexbuf buffer len =
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output_string stdout (if !first_line then "# " else " "); flush stdout;
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first_line := false;
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let n = min len (abs(input_scan_line stdin)) in
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input stdin buffer 0 n
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(* Discard everything already in a lexer buffer *)
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let empty_lexbuf lb =
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let l = String.length lb.lex_buffer in
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lb.lex_abs_pos <- (-l);
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lb.lex_curr_pos <- l
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(* Toplevel initialization. Performed here instead of at the
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beginning of loop() so that user code linked in with cslmktop
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can call directives from Topdirs. *)
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let _ =
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Symtable.init_toplevel();
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Compile.init_path();
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Sys.interactive := true
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(* The loop *)
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let parse_toplevel_phrase = ref Parse.toplevel_phrase
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let loop() =
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print_string "\tObjective Caml version ";
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print_string Config.version;
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print_newline(); print_newline();
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(* Add whatever -I options have been specified on the command line,
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but keep the directories that user code linked in with ocamlmktop
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may have added to load_path. *)
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load_path := "" :: (List.rev !Clflags.include_dirs @ !load_path);
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toplevel_env := Compile.initial_env();
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let lb = Lexing.from_function refill_lexbuf in
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Location.input_name := "";
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Location.input_lexbuf := Some lb;
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Sys.catch_break true;
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while true do
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try
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empty_lexbuf lb;
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Location.reset();
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first_line := true;
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execute_phrase (!parse_toplevel_phrase lb); ()
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with
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End_of_file ->
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print_newline(); exit 0
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| Sys.Break ->
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print_string "Interrupted."; print_newline()
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| x ->
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Errors.report_error x
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done
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