390 lines
15 KiB
OCaml
390 lines
15 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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(* 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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(* $Id$ *)
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(* Translation from typed abstract syntax to lambda terms,
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for the module language *)
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open Misc
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open Asttypes
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open Path
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open Types
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open Typedtree
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open Lambda
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open Translobj
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open Translcore
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open Translclass
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(* Compile a coercion *)
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let rec apply_coercion restr arg =
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match restr with
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Tcoerce_none ->
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arg
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| Tcoerce_structure pos_cc_list ->
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name_lambda arg (fun id ->
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Lprim(Pmakeblock(0, Immutable),
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List.map (apply_coercion_field id) pos_cc_list))
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| Tcoerce_functor(cc_arg, cc_res) ->
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let param = Ident.create "funarg" in
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name_lambda arg (fun id ->
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Lfunction(Curried, [param],
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apply_coercion cc_res
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(Lapply(Lvar id, [apply_coercion cc_arg (Lvar param)]))))
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| Tcoerce_primitive p ->
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transl_primitive p
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and apply_coercion_field id (pos, cc) =
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apply_coercion cc (Lprim(Pfield pos, [Lvar id]))
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(* Compose two coercions
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apply_coercion c1 (apply_coercion c2 e) behaves like
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apply_coercion (compose_coercions c1 c2) e. *)
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let rec compose_coercions c1 c2 =
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match (c1, c2) with
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(Tcoerce_none, c2) -> c2
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| (c1, Tcoerce_none) -> c1
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| (Tcoerce_structure pc1, Tcoerce_structure pc2) ->
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let v2 = Array.of_list pc2 in
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Tcoerce_structure
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(List.map
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(function (p1, Tcoerce_primitive p) ->
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(p1, Tcoerce_primitive p)
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| (p1, c1) ->
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let (p2, c2) = v2.(p1) in (p2, compose_coercions c1 c2))
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pc1)
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| (Tcoerce_functor(arg1, res1), Tcoerce_functor(arg2, res2)) ->
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Tcoerce_functor(compose_coercions arg2 arg1,
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compose_coercions res1 res2)
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| (_, _) ->
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fatal_error "Translmod.compose_coercions"
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(* Record the primitive declarations occuring in the module compiled *)
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let primitive_declarations = ref ([] : string list)
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(* Keep track of the root path (from the root of the namespace to the
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currently compiled module expression). Useful for naming exceptions. *)
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let global_path glob = Some(Pident glob)
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let functor_path path param =
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match path with
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None -> None
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| Some p -> Some(Papply(p, Pident param))
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let field_path path field =
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match path with
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None -> None
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| Some p -> Some(Pdot(p, Ident.name field, Path.nopos))
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(* Compile a module expression *)
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let rec transl_module cc rootpath mexp =
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match mexp.mod_desc with
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Tmod_ident path ->
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apply_coercion cc (transl_path path)
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| Tmod_structure str ->
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transl_structure [] cc rootpath str
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| Tmod_functor(param, mty, body) ->
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let bodypath = functor_path rootpath param in
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begin match cc with
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Tcoerce_none ->
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Lfunction(Curried, [param], transl_module Tcoerce_none bodypath body)
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| Tcoerce_functor(ccarg, ccres) ->
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let param' = Ident.create "funarg" in
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Lfunction(Curried, [param'],
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Llet(Alias, param, apply_coercion ccarg (Lvar param'),
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transl_module ccres bodypath body))
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| _ ->
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fatal_error "Translmod.transl_module"
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end
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| Tmod_apply(funct, arg, ccarg) ->
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apply_coercion cc
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(Lapply(transl_module Tcoerce_none None funct,
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[transl_module ccarg None arg]))
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| Tmod_constraint(arg, mty, ccarg) ->
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transl_module (compose_coercions cc ccarg) rootpath arg
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and transl_structure fields cc rootpath = function
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[] ->
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begin match cc with
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Tcoerce_none ->
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Lprim(Pmakeblock(0, Immutable),
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List.map (fun id -> Lvar id) (List.rev fields))
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| Tcoerce_structure pos_cc_list ->
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let v = Array.of_list (List.rev fields) in
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Lprim(Pmakeblock(0, Immutable),
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List.map
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(fun (pos, cc) ->
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match cc with
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Tcoerce_primitive p -> transl_primitive p
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| _ -> apply_coercion cc (Lvar v.(pos)))
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pos_cc_list)
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| _ ->
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fatal_error "Translmod.transl_structure"
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end
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| Tstr_eval expr :: rem ->
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Lsequence(transl_exp expr, transl_structure fields cc rootpath rem)
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| Tstr_value(rec_flag, pat_expr_list) :: rem ->
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let ext_fields = rev_let_bound_idents pat_expr_list @ fields in
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transl_let rec_flag pat_expr_list
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(transl_structure ext_fields cc rootpath rem)
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| Tstr_primitive(id, descr) :: rem ->
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begin match descr.val_kind with
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Val_prim p -> primitive_declarations :=
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p.Primitive.prim_name :: !primitive_declarations
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| _ -> ()
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end;
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transl_structure fields cc rootpath rem
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| Tstr_type(decls) :: rem ->
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transl_structure fields cc rootpath rem
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| Tstr_exception(id, decl) :: rem ->
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Llet(Strict, id, transl_exception id (field_path rootpath id) decl,
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transl_structure (id :: fields) cc rootpath rem)
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| Tstr_module(id, modl) :: rem ->
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Llet(Strict, id,
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transl_module Tcoerce_none (field_path rootpath id) modl,
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transl_structure (id :: fields) cc rootpath rem)
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| Tstr_modtype(id, decl) :: rem ->
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transl_structure fields cc rootpath rem
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| Tstr_open path :: rem ->
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transl_structure fields cc rootpath rem
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| Tstr_class cl_list :: rem ->
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let ids = List.map (fun (i, _, _, _) -> i) cl_list in
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Lletrec(List.map
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(fun (id, arity, meths, cl) ->
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(id, transl_class ids id arity meths cl))
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cl_list,
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transl_structure (List.rev ids @ fields) cc rootpath rem)
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| Tstr_cltype cl_list :: rem ->
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transl_structure fields cc rootpath rem
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(* Update forward declaration in Translcore *)
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let _ =
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Translcore.transl_module := transl_module
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(* Compile an implementation *)
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let transl_implementation module_name (str, cc) =
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reset_labels ();
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primitive_declarations := [];
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let module_id = Ident.create_persistent module_name in
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Lprim(Psetglobal module_id,
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[transl_label_init
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(transl_structure [] cc (global_path module_id) str)])
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(* A variant of transl_structure used to compile toplevel structure definitions
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for the native-code compiler. Store the defined values in the fields
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of the global as soon as they are defined, in order to reduce register
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pressure. Also rewrites the defining expressions so that they
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refer to earlier fields of the structure through the fields of
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the global, not by their names.
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"map" is a table from defined idents to (pos in global block, coercion).
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"prim" is a list of (pos in global block, primitive declaration). *)
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let transl_store_structure glob map prims str =
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let rec transl_store subst = function
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[] ->
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lambda_unit
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| Tstr_eval expr :: rem ->
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Lsequence(subst_lambda subst (transl_exp expr),
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transl_store subst rem)
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| Tstr_value(rec_flag, pat_expr_list) :: rem ->
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let ids = let_bound_idents pat_expr_list in
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let lam = transl_let rec_flag pat_expr_list (store_idents ids) in
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Lsequence(subst_lambda subst lam,
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transl_store (add_idents ids subst) rem)
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| Tstr_primitive(id, descr) :: rem ->
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begin match descr.val_kind with
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Val_prim p -> primitive_declarations :=
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p.Primitive.prim_name :: !primitive_declarations
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| _ -> ()
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end;
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transl_store subst rem
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| Tstr_type(decls) :: rem ->
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transl_store subst rem
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| Tstr_exception(id, decl) :: rem ->
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let lam = transl_exception id (field_path (global_path glob) id) decl in
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Lsequence(Llet(Strict, id, lam, store_ident id),
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transl_store (add_ident false id subst) rem)
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| Tstr_module(id, modl) :: rem ->
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let lam =
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transl_module Tcoerce_none (field_path (global_path glob) id) modl in
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(* Careful: the module value stored in the global may be different
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from the local module value, in case a coercion is applied.
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If so, keep using the local module value (id) in the remainder of
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the compilation unit (add_ident true returns subst unchanged).
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If not, we can use the value from the global
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(add_ident true adds id -> Pgetglobal... to subst). *)
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Llet(Strict, id, subst_lambda subst lam,
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Lsequence(store_ident id, transl_store(add_ident true id subst) rem))
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| Tstr_modtype(id, decl) :: rem ->
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transl_store subst rem
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| Tstr_open path :: rem ->
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transl_store subst rem
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| Tstr_class cl_list :: rem ->
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let ids = List.map (fun (i, _, _, _) -> i) cl_list in
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let lam =
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Lletrec(List.map
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(fun (id, arity, meths, cl) ->
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(id, transl_class ids id arity meths cl))
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cl_list,
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store_idents ids) in
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Lsequence(subst_lambda subst lam,
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transl_store (add_idents ids subst) rem)
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| Tstr_cltype cl_list :: rem ->
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transl_store subst rem
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and store_ident id =
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try
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let (pos, cc) = Ident.find_same id map in
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let init_val = apply_coercion cc (Lvar id) in
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Lprim(Psetfield(pos, false), [Lprim(Pgetglobal glob, []); init_val])
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with Not_found ->
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fatal_error("Translmod.store_ident: " ^ Ident.unique_name id)
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and store_idents idlist =
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make_sequence store_ident idlist
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and add_ident may_coerce id subst =
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try
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let (pos, cc) = Ident.find_same id map in
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match cc with
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Tcoerce_none ->
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Ident.add id (Lprim(Pfield pos, [Lprim(Pgetglobal glob, [])])) subst
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| _ ->
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if may_coerce then subst else assert false
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with Not_found ->
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assert false
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and add_idents idlist subst =
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List.fold_right (add_ident false) idlist subst
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and store_primitive (pos, prim) cont =
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Lsequence(Lprim(Psetfield(pos, false),
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[Lprim(Pgetglobal glob, []); transl_primitive prim]),
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cont)
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in List.fold_right store_primitive prims (transl_store Ident.empty str)
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(* Build the list of value identifiers defined by a toplevel structure
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(excluding primitive declarations). *)
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let rec defined_idents = function
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[] -> []
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| Tstr_eval expr :: rem -> defined_idents rem
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| Tstr_value(rec_flag, pat_expr_list) :: rem ->
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let_bound_idents pat_expr_list @ defined_idents rem
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| Tstr_primitive(id, descr) :: rem -> defined_idents rem
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| Tstr_type decls :: rem -> defined_idents rem
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| Tstr_exception(id, decl) :: rem -> id :: defined_idents rem
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| Tstr_module(id, modl) :: rem -> id :: defined_idents rem
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| Tstr_modtype(id, decl) :: rem -> defined_idents rem
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| Tstr_open path :: rem -> defined_idents rem
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| Tstr_class cl_list :: rem ->
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List.map (fun (i, _, _, _) -> i) cl_list @ defined_idents rem
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| Tstr_cltype cl_list :: rem -> defined_idents rem
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(* Transform a coercion and the list of value identifiers defined by
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a toplevel structure into a table [id -> (pos, coercion)],
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with [pos] being the position in the global block where the value of
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[id] must be stored, and [coercion] the coercion to be applied to it.
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A given identifier may appear several times
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in the coercion (if it occurs several times in the signature); remember
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to assign it the position of its last occurrence.
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Identifiers that are not exported are assigned positions at the
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end of the block (beyond the positions of all exported idents).
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Also compute the total size of the global block,
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and the list of all primitives exported as values. *)
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let build_ident_map restr idlist =
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let rec natural_map pos map prims = function
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[] ->
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(map, prims, pos)
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| id :: rem ->
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natural_map (pos+1) (Ident.add id (pos, Tcoerce_none) map) prims rem in
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match restr with
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Tcoerce_none ->
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natural_map 0 Ident.empty [] idlist
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| Tcoerce_structure pos_cc_list ->
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let idarray = Array.of_list idlist in
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let rec export_map pos map prims undef = function
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[] ->
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natural_map pos map prims undef
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| (source_pos, Tcoerce_primitive p) :: rem ->
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export_map (pos + 1) map ((pos, p) :: prims) undef rem
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| (source_pos, cc) :: rem ->
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let id = idarray.(source_pos) in
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export_map (pos + 1) (Ident.add id (pos, cc) map)
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prims (list_remove id undef) rem
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in export_map 0 Ident.empty [] idlist pos_cc_list
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| _ ->
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fatal_error "Translmod.build_ident_map"
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(* Compile an implementation using transl_store_structure
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(for the native-code compiler). *)
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let transl_store_implementation module_name (str, restr) =
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reset_labels ();
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primitive_declarations := [];
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let module_id = Ident.create_persistent module_name in
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let (map, prims, size) = build_ident_map restr (defined_idents str) in
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(size, transl_label_init (transl_store_structure module_id map prims str))
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(* Compile a toplevel phrase *)
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let transl_toplevel_item = function
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Tstr_eval expr ->
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transl_exp expr
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| Tstr_value(rec_flag, pat_expr_list) ->
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let idents = let_bound_idents pat_expr_list in
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let lam =
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transl_let rec_flag pat_expr_list
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(make_sequence (fun id -> Lprim(Psetglobal id, [Lvar id])) idents) in
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List.iter Ident.make_global idents;
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lam
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| Tstr_primitive(id, descr) ->
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lambda_unit
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| Tstr_type(decls) ->
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lambda_unit
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| Tstr_exception(id, decl) ->
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Ident.make_global id;
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Lprim(Psetglobal id, [transl_exception id None decl])
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| Tstr_module(id, modl) ->
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Ident.make_global id;
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Lprim(Psetglobal id, [transl_module Tcoerce_none None modl])
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| Tstr_modtype(id, decl) ->
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lambda_unit
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| Tstr_open path ->
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lambda_unit
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| Tstr_class cl_list ->
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let ids = List.map (fun (i, _, _, _) -> i) cl_list in
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let lam =
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Lletrec(List.map
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(fun (id, arity, meths, cl) ->
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(id, transl_class ids id arity meths cl))
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cl_list,
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make_sequence
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(fun (id, _, _, _) -> Lprim(Psetglobal id, [Lvar id]))
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cl_list)
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in
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List.iter (fun (id, _, _, _) -> Ident.make_global id) cl_list;
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lam
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| Tstr_cltype cl_list ->
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lambda_unit
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let transl_toplevel_definition str =
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reset_labels ();
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transl_label_init (make_sequence transl_toplevel_item str)
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