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(* Js_of_ocaml compiler
* http://www.ocsigen.org/js_of_ocaml/
* Copyright (C) 2019 Hugo Heuzard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, with linking exception;
* either version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)
open! Stdlib
module J = Javascript
let zero = J.ENum (J.Num.of_targetint Targetint.zero)
let one = J.ENum (J.Num.of_targetint Targetint.one)
(* JavaScript engines recognize the pattern 'typeof x==="number"'; if the string is
shared, less efficient code is generated. *)
let type_of_is_number binop e =
J.EBin (binop, J.EUn (J.Typeof, e), J.EStr (Utf8_string.of_string_exn "number"))
let is_block e = type_of_is_number J.NotEqEq e
let is_immediate e = type_of_is_number J.EqEqEq e
module Block = struct
let make ~tag ~args =
let tag_elt = J.Element (J.ENum (J.Num.of_targetint (Targetint.of_int_exn tag))) in
J.EArr (tag_elt :: args)
let tag e = J.EAccess (e, ANormal, zero)
let field e idx =
let adjusted = J.ENum (J.Num.of_targetint (Targetint.of_int_exn (idx + 1))) in
J.EAccess (e, ANormal, adjusted)
end
module Array = struct
let make = Block.make
let length e =
let underlying = J.EDot (e, ANormal, Utf8_string.of_string_exn "length") in
J.EBin (J.Minus, underlying, one)
let field e i =
match i with
| J.ENum n ->
let idx = J.Num.to_targetint n in
let adjusted = J.ENum (J.Num.of_targetint (Targetint.succ idx)) in
J.EAccess (e, ANormal, adjusted)
| J.EUn (J.Neg, _) -> failwith "Negative field indexes are not allowed"
| _ ->
let adjusted = J.EBin (J.Plus, one, i) in
J.EAccess (e, ANormal, adjusted)
end
|
