591 lines
21 KiB
OCaml
591 lines
21 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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(* Translation from typed abstract syntax to lambda terms,
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for the core language *)
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open Misc
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open Asttypes
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open Primitive
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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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type error =
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Illegal_letrec_pat
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| Illegal_letrec_expr
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| Free_super_var
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exception Error of Location.t * error
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(* Translation of primitives *)
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let comparisons_table = create_hashtable 11 [
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"%equal",
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(Pccall{prim_name = "equal"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false},
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Pintcomp Ceq,
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Pfloatcomp Ceq,
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Pccall{prim_name = "string_equal"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false});
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"%notequal",
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(Pccall{prim_name = "notequal"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false},
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Pintcomp Cneq,
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Pfloatcomp Cneq,
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Pccall{prim_name = "string_notequal"; prim_arity = 2;
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prim_alloc = false; prim_native_name = "";
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prim_native_float = false});
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"%lessthan",
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(Pccall{prim_name = "lessthan"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false},
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Pintcomp Clt,
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Pfloatcomp Clt,
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Pccall{prim_name = "lessthan"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false});
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"%greaterthan",
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(Pccall{prim_name = "greaterthan"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false},
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Pintcomp Cgt,
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Pfloatcomp Cgt,
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Pccall{prim_name = "greaterthan"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false});
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"%lessequal",
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(Pccall{prim_name = "lessequal"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false},
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Pintcomp Cle,
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Pfloatcomp Cle,
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Pccall{prim_name = "lessequal"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false});
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"%greaterequal",
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(Pccall{prim_name = "greaterequal"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false},
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Pintcomp Cge,
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Pfloatcomp Cge,
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Pccall{prim_name = "greaterequal"; prim_arity = 2; prim_alloc = false;
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prim_native_name = ""; prim_native_float = false})
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]
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let primitives_table = create_hashtable 31 [
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"%identity", Pidentity;
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"%field0", Pfield 0;
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"%field1", Pfield 1;
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"%setfield0", Psetfield(0, true);
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"%makeblock", Pmakeblock(0, Immutable);
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"%makemutable", Pmakeblock(0, Mutable);
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"%raise", Praise;
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"%sequand", Psequand;
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"%sequor", Psequor;
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"%boolnot", Pnot;
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"%negint", Pnegint;
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"%succint", Poffsetint 1;
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"%predint", Poffsetint(-1);
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"%addint", Paddint;
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"%subint", Psubint;
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"%mulint", Pmulint;
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"%divint", Pdivint;
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"%modint", Pmodint;
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"%andint", Pandint;
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"%orint", Porint;
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"%xorint", Pxorint;
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"%lslint", Plslint;
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"%lsrint", Plsrint;
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"%asrint", Pasrint;
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"%eq", Pintcomp Ceq;
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"%noteq", Pintcomp Cneq;
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"%ltint", Pintcomp Clt;
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"%leint", Pintcomp Cle;
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"%gtint", Pintcomp Cgt;
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"%geint", Pintcomp Cge;
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"%incr", Poffsetref(1);
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"%decr", Poffsetref(-1);
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"%intoffloat", Pintoffloat;
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"%floatofint", Pfloatofint;
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"%negfloat", Pnegfloat;
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"%absfloat", Pabsfloat;
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"%addfloat", Paddfloat;
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"%subfloat", Psubfloat;
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"%mulfloat", Pmulfloat;
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"%divfloat", Pdivfloat;
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"%eqfloat", Pfloatcomp Ceq;
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"%noteqfloat", Pfloatcomp Cneq;
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"%ltfloat", Pfloatcomp Clt;
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"%lefloat", Pfloatcomp Cle;
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"%gtfloat", Pfloatcomp Cgt;
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"%gefloat", Pfloatcomp Cge;
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"%string_length", Pstringlength;
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"%string_safe_get", Pstringrefs;
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"%string_safe_set", Pstringsets;
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"%string_unsafe_get", Pstringrefu;
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"%string_unsafe_set", Pstringsetu;
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"%array_length", Parraylength Pgenarray;
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"%array_safe_get", Parrayrefs Pgenarray;
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"%array_safe_set", Parraysets Pgenarray;
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"%array_unsafe_get", Parrayrefu Pgenarray;
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"%array_unsafe_set", Parraysetu Pgenarray;
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"%obj_size", Parraylength Paddrarray;
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"%obj_field", Parrayrefu Paddrarray;
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"%obj_set_field", Parraysetu Paddrarray
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]
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let has_base_type exp base_ty =
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(* Do not expand abbreviations here, to avoid bringing in external
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interfaces that are not strictly necessary. This results in sligthly
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suboptimal code. The correct way of doing this would be to
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consult the type definition (as in array_element_kind below)
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to return false if exp.exp_type is a variant or record type. *)
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match ((Ctype.repr exp.exp_type).desc, (Ctype.repr base_ty).desc) with
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(Tconstr(p1, [], _), Tconstr(p2, [], _)) -> Path.same p1 p2
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| (_, _) -> false
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let maybe_pointer arg =
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not(has_base_type arg Predef.type_int or has_base_type arg Predef.type_char)
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let rec array_element_kind env ty =
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let ty = Ctype.repr ty in
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match ty.desc with
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Tvar ->
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Pgenarray
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| Tconstr(p, args, abbrev) ->
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if Path.same p Predef.path_int || Path.same p Predef.path_char then
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Pintarray
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else if Path.same p Predef.path_float then
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Pfloatarray
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else if Path.same p Predef.path_string ||
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Path.same p Predef.path_array then
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Paddrarray
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else begin
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try
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match Env.find_type p env with
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{type_kind = Type_abstract} ->
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begin try
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array_element_kind env
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(Ctype.expand_abbrev env p args abbrev ty.level)
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with Ctype.Cannot_expand ->
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Pgenarray
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end
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| {type_kind = Type_variant cstrs}
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when List.for_all (fun (name, args) -> args = []) cstrs ->
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Pintarray
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| {type_kind = _} ->
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Paddrarray
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with Not_found ->
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(* This can happen due to e.g. missing -I options,
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causing some .cmi files to be unavailable.
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Maybe we should emit a warning. *)
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Pgenarray
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end
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| _ -> Paddrarray
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let array_kind arg =
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let ty = Ctype.correct_levels arg.exp_type in
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let array_ty = Ctype.expand_head arg.exp_env ty in
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match (Ctype.repr array_ty).desc with
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Tconstr(p, [elt_ty], _) when Path.same p Predef.path_array ->
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array_element_kind arg.exp_env elt_ty
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| _ ->
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fatal_error "Translcore.array_kind"
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let prim_makearray =
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{ prim_name = "make_vect"; prim_arity = 2; prim_alloc = true;
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prim_native_name = ""; prim_native_float = false }
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let transl_prim prim args =
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try
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let (gencomp, intcomp, floatcomp, stringcomp) =
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Hashtbl.find comparisons_table prim.prim_name in
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begin match args with
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[arg1; {exp_desc = Texp_construct({cstr_tag = Cstr_constant _}, _)}] ->
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intcomp
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| [{exp_desc = Texp_construct({cstr_tag = Cstr_constant _}, _)}; arg2] ->
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intcomp
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| [arg1; arg2] when has_base_type arg1 Predef.type_int
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or has_base_type arg1 Predef.type_char ->
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intcomp
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| [arg1; arg2] when has_base_type arg1 Predef.type_float ->
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floatcomp
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| [arg1; arg2] when has_base_type arg1 Predef.type_string ->
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stringcomp
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| _ ->
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gencomp
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end,
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false
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with Not_found ->
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try
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let p = Hashtbl.find primitives_table prim.prim_name in
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(* Try strength reduction based on the type of the argument *)
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begin match (p, args) with
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(Psetfield(n, _), [arg1; arg2]) -> Psetfield(n, maybe_pointer arg2)
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| (Parraylength Pgenarray, [arg]) -> Parraylength(array_kind arg)
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| (Parrayrefu Pgenarray, arg1 :: _) -> Parrayrefu(array_kind arg1)
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| (Parraysetu Pgenarray, arg1 :: _) -> Parraysetu(array_kind arg1)
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| (Parrayrefs Pgenarray, arg1 :: _) -> Parrayrefs(array_kind arg1)
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| (Parraysets Pgenarray, arg1 :: _) -> Parraysets(array_kind arg1)
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| _ -> p
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end,
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false
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with Not_found ->
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Pccall prim,
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true
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(* Eta-expand a primitive without knowing the types of its arguments *)
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let transl_primitive p =
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let prim =
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try
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let (gencomp, intcomp, floatcomp, stringcomp) =
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Hashtbl.find comparisons_table p.prim_name in
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gencomp
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with Not_found ->
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try
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Hashtbl.find primitives_table p.prim_name
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with Not_found ->
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Pccall p in
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let rec make_params n =
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if n <= 0 then [] else Ident.create "prim" :: make_params (n-1) in
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let params = make_params p.prim_arity in
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Lfunction(Curried, params, Lprim(prim, List.map (fun id -> Lvar id) params))
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(* To check the well-formedness of r.h.s. of "let rec" definitions *)
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let check_recursive_lambda idlist lam =
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let rec check_top = function
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Lfunction(kind, params, body) as funct -> true
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| Lprim(Pmakeblock(tag, mut), args) -> List.for_all check args
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| Lprim(Pmakearray kind, args) -> List.for_all check args
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| Llet(str, id, arg, body) -> check arg & check_top body
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| Lletrec(bindings, body) ->
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List.for_all (fun (id, arg) -> check arg) bindings & check_top body
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| _ -> false
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and check = function
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Lvar _ -> true
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| Lconst cst -> true
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| Lfunction(kind, params, body) -> true
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| Llet(str, id, arg, body) -> check arg & check body
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| Lletrec(bindings, body) ->
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List.for_all (fun (id, arg) -> check arg) bindings & check body
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| Lprim(Pmakeblock(tag, mut), args) -> List.for_all check args
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| Lprim(Pmakearray kind, args) -> List.for_all check args
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| lam ->
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let fv = free_variables lam in
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List.for_all (fun id -> not(IdentSet.mem id fv)) idlist
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in check_top lam
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(* To propagate structured constants *)
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exception Not_constant
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let extract_constant = function
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Lconst sc -> sc
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| _ -> raise Not_constant
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let extract_float = function
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Const_base(Const_float f) -> f
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| _ -> fatal_error "Translcore.extract_float"
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(* To find reasonable names for let-bound and lambda-bound idents *)
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let rec name_pattern default = function
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[] -> Ident.create default
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| (p, e) :: rem ->
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match p.pat_desc with
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Tpat_var id -> id
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| Tpat_alias(p, id) -> id
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| _ -> name_pattern default rem
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(* Insertion of debugging events *)
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let event_before exp lam =
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if !Clflags.debug && lam <> Lstaticfail
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then Levent(lam, {lev_loc = exp.exp_loc.Location.loc_start;
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lev_kind = Lev_before;
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lev_repr = None;
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lev_env = Env.summary exp.exp_env})
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else lam
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let event_after exp lam =
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if !Clflags.debug
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then Levent(lam, {lev_loc = exp.exp_loc.Location.loc_end;
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lev_kind = Lev_after exp.exp_type;
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lev_repr = None;
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lev_env = Env.summary exp.exp_env})
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else lam
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let event_function exp lam =
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if !Clflags.debug then
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let repr = Some (ref 0) in
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let (info, body) = lam repr in
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(info,
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Levent(body, {lev_loc = exp.exp_loc.Location.loc_start;
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lev_kind = Lev_function;
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lev_repr = repr;
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lev_env = Env.summary exp.exp_env}))
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else
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lam None
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(* Translation of expressions *)
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let rec transl_exp e =
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match e.exp_desc with
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Texp_ident(path, {val_kind = Val_prim p}) ->
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transl_primitive p
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| Texp_ident(path, {val_kind = Val_anc _}) ->
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raise(Error(e.exp_loc, Free_super_var))
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| Texp_ident(path, desc) ->
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transl_path path
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| Texp_constant cst ->
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Lconst(Const_base cst)
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| Texp_let(rec_flag, pat_expr_list, body) ->
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transl_let rec_flag pat_expr_list (event_before body (transl_exp body))
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| Texp_function pat_expr_list ->
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let ((kind, params), body) =
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event_function e
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(function repr ->
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transl_function e.exp_loc !Clflags.native_code repr pat_expr_list)
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in
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Lfunction(kind, params, body)
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| Texp_apply({exp_desc = Texp_ident(path, {val_kind = Val_prim p})}, args)
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when List.length args = p.prim_arity ->
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let (prim, c_call) = transl_prim p args in
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let lam = Lprim(prim, transl_list args) in
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if c_call then event_after e lam
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else lam
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| Texp_apply(funct, args) ->
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let lam =
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match transl_exp funct with
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Lsend(lmet, lobj, largs) ->
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Lsend(lmet, lobj, largs @ transl_list args)
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| Levent(Lsend(lmet, lobj, largs), _) ->
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Lsend(lmet, lobj, largs @ transl_list args)
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| lexp ->
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Lapply(lexp, transl_list args) in
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event_after e lam
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| Texp_match({exp_desc = Texp_tuple argl} as arg, pat_expr_list) ->
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Matching.for_multiple_match e.exp_loc
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(transl_list argl) (transl_cases pat_expr_list)
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| Texp_match(arg, pat_expr_list) ->
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Matching.for_function e.exp_loc None
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(transl_exp arg) (transl_cases pat_expr_list)
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| Texp_try(body, pat_expr_list) ->
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let id = Ident.create "exn" in
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Ltrywith(transl_exp body, id,
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Matching.for_trywith (Lvar id) (transl_cases pat_expr_list))
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| Texp_tuple el ->
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let ll = transl_list el in
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begin try
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Lconst(Const_block(0, List.map extract_constant ll))
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with Not_constant ->
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Lprim(Pmakeblock(0, Immutable), ll)
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end
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| Texp_construct(cstr, args) ->
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let ll = transl_list args in
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begin match cstr.cstr_tag with
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Cstr_constant n ->
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Lconst(Const_pointer n)
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| Cstr_block n ->
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begin try
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Lconst(Const_block(n, List.map extract_constant ll))
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with Not_constant ->
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Lprim(Pmakeblock(n, Immutable), ll)
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end
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| Cstr_exception path ->
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Lprim(Pmakeblock(0, Immutable), transl_path path :: ll)
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end
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| Texp_record ((lbl1, _) :: _ as lbl_expr_list) ->
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let lv = Array.create (Array.length lbl1.lbl_all) Lstaticfail in
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List.iter
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(fun (lbl, expr) -> lv.(lbl.lbl_pos) <- transl_exp expr)
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lbl_expr_list;
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let ll = Array.to_list lv in
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if List.exists (fun (lbl, expr) -> lbl.lbl_mut = Mutable) lbl_expr_list
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then begin
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match lbl1.lbl_repres with
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Record_regular -> Lprim(Pmakeblock(0, Mutable), ll)
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| Record_float -> Lprim(Pmakearray Pfloatarray, ll)
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end else begin
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try
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let cl = List.map extract_constant ll in
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match lbl1.lbl_repres with
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Record_regular -> Lconst(Const_block(0, cl))
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| Record_float ->
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Lconst(Const_float_array(List.map extract_float cl))
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with Not_constant ->
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match lbl1.lbl_repres with
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Record_regular -> Lprim(Pmakeblock(0, Immutable), ll)
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| Record_float -> Lprim(Pmakearray Pfloatarray, ll)
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end
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| Texp_field(arg, lbl) ->
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let access =
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match lbl.lbl_repres with
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Record_regular -> Pfield lbl.lbl_pos
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| Record_float -> Pfloatfield lbl.lbl_pos in
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Lprim(access, [transl_exp arg])
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| Texp_setfield(arg, lbl, newval) ->
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let access =
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match lbl.lbl_repres with
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Record_regular -> Psetfield(lbl.lbl_pos, maybe_pointer newval)
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| Record_float -> Psetfloatfield lbl.lbl_pos in
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Lprim(access, [transl_exp arg; transl_exp newval])
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| Texp_array expr_list ->
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let kind = array_kind e in
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let len = List.length expr_list in
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if len <= Config.max_young_wosize then
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Lprim(Pmakearray kind, transl_list expr_list)
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else begin
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let v = Ident.create "makearray" in
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let rec fill_fields pos = function
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[] ->
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Lvar v
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| arg :: rem ->
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Lsequence(Lprim(Parraysetu kind,
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[Lvar v;
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Lconst(Const_base(Const_int pos));
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transl_exp arg]),
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fill_fields (pos+1) rem) in
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Llet(Strict, v,
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Lprim(Pccall prim_makearray,
|
|
[Lconst(Const_base(Const_int len));
|
|
transl_exp (List.hd expr_list)]),
|
|
fill_fields 1 (List.tl expr_list))
|
|
end
|
|
| Texp_ifthenelse(cond, ifso, Some ifnot) ->
|
|
Lifthenelse(transl_exp cond,
|
|
event_before ifso (transl_exp ifso),
|
|
event_before ifnot (transl_exp ifnot))
|
|
| Texp_ifthenelse(cond, ifso, None) ->
|
|
Lifthenelse(transl_exp cond,
|
|
event_before ifso (transl_exp ifso),
|
|
lambda_unit)
|
|
| Texp_sequence(expr1, expr2) ->
|
|
Lsequence(transl_exp expr1, event_before expr2 (transl_exp expr2))
|
|
| Texp_while(cond, body) ->
|
|
Lwhile(transl_exp cond, event_before body (transl_exp body))
|
|
| Texp_for(param, low, high, dir, body) ->
|
|
Lfor(param, transl_exp low, transl_exp high, dir,
|
|
event_before body (transl_exp body))
|
|
| Texp_when(cond, body) ->
|
|
event_before cond
|
|
(Lifthenelse(transl_exp cond, event_before body (transl_exp body),
|
|
Lstaticfail))
|
|
| Texp_send(expr, met) ->
|
|
event_after e (Lsend(Lvar (meth met), transl_exp expr, []))
|
|
| Texp_new cl ->
|
|
Lprim(Pfield 0, [transl_path cl])
|
|
| Texp_instvar(path_self, path) ->
|
|
Lprim(Parrayrefu Paddrarray , [transl_path path_self; transl_path path])
|
|
| Texp_setinstvar(path_self, path, expr) ->
|
|
transl_setinstvar (transl_path path_self) path expr
|
|
| Texp_override(path_self, modifs) ->
|
|
let cpy = Ident.create "copy" in
|
|
Llet(Strict, cpy, Lapply(oo_prim "copy", [transl_path path_self]),
|
|
List.fold_right
|
|
(fun (path, expr) rem ->
|
|
Lsequence(transl_setinstvar (Lvar cpy) path expr,
|
|
rem))
|
|
modifs
|
|
(Lvar cpy))
|
|
| _ ->
|
|
fatal_error "Translcore.transl"
|
|
|
|
and transl_list expr_list =
|
|
List.map transl_exp expr_list
|
|
|
|
and transl_cases pat_expr_list =
|
|
List.map
|
|
(fun (pat, expr) -> (pat, event_before expr (transl_exp expr)))
|
|
pat_expr_list
|
|
|
|
and transl_tupled_cases patl_expr_list =
|
|
List.map (fun (patl, expr) -> (patl, transl_exp expr)) patl_expr_list
|
|
|
|
and transl_function loc untuplify_fn repr pat_expr_list =
|
|
match pat_expr_list with
|
|
[pat, ({exp_desc = Texp_function pl} as exp)] ->
|
|
let param = name_pattern "param" pat_expr_list in
|
|
let ((_, params), body) = transl_function exp.exp_loc false repr pl in
|
|
((Curried, param :: params),
|
|
Matching.for_function loc None (Lvar param) [pat, body])
|
|
| ({pat_desc = Tpat_tuple pl}, _) :: _ when untuplify_fn ->
|
|
begin try
|
|
let size = List.length pl in
|
|
let pats_expr_list =
|
|
List.map
|
|
(fun (pat, expr) -> (Matching.flatten_pattern size pat, expr))
|
|
pat_expr_list in
|
|
let params = List.map (fun p -> Ident.create "param") pl in
|
|
((Tupled, params),
|
|
Matching.for_tupled_function loc params
|
|
(transl_tupled_cases pats_expr_list))
|
|
with Matching.Cannot_flatten ->
|
|
let param = name_pattern "param" pat_expr_list in
|
|
((Curried, [param]),
|
|
Matching.for_function loc repr (Lvar param)
|
|
(transl_cases pat_expr_list))
|
|
end
|
|
| _ ->
|
|
let param = name_pattern "param" pat_expr_list in
|
|
((Curried, [param]),
|
|
Matching.for_function loc repr (Lvar param)
|
|
(transl_cases pat_expr_list))
|
|
|
|
and transl_let rec_flag pat_expr_list body =
|
|
match rec_flag with
|
|
Nonrecursive ->
|
|
let rec transl = function
|
|
[] ->
|
|
body
|
|
| (pat, expr) :: rem ->
|
|
Matching.for_let pat.pat_loc (transl_exp expr) pat (transl rem)
|
|
in transl pat_expr_list
|
|
| Recursive ->
|
|
let idlist =
|
|
List.map
|
|
(fun (pat, expr) ->
|
|
match pat.pat_desc with
|
|
Tpat_var id -> id
|
|
| _ -> raise(Error(pat.pat_loc, Illegal_letrec_pat)))
|
|
pat_expr_list in
|
|
let transl_case (pat, expr) id =
|
|
let lam = transl_exp expr in
|
|
if not (check_recursive_lambda idlist lam) then
|
|
raise(Error(expr.exp_loc, Illegal_letrec_expr));
|
|
(id, lam) in
|
|
Lletrec(List.map2 transl_case pat_expr_list idlist, body)
|
|
|
|
and transl_setinstvar self var expr =
|
|
Lprim(Parraysetu (if maybe_pointer expr then Paddrarray else Pintarray),
|
|
[self; transl_path var; transl_exp expr])
|
|
|
|
(* Compile an exception definition *)
|
|
|
|
let transl_exception id decl =
|
|
Lprim(Pmakeblock(0, Immutable),
|
|
[Lconst(Const_base(Const_string(Ident.name id)))])
|
|
|
|
(* Error report *)
|
|
|
|
open Format
|
|
|
|
let report_error = function
|
|
Illegal_letrec_pat ->
|
|
print_string
|
|
"Only variables are allowed as left-hand side of `let rec'"
|
|
| Illegal_letrec_expr ->
|
|
print_string
|
|
"This kind of expression is not allowed as right-hand side of `let rec'"
|
|
| Free_super_var ->
|
|
print_string
|
|
"Ancestor names can only be used to select inherited methods"
|