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(* Copyright (C) 1999-2007 Henry Cejtin, Matthew Fluet, Suresh
* Jagannathan, and Stephen Weeks.
* Copyright (C) 1997-2000 NEC Research Institute.
*
* MLton is released under a BSD-style license.
* See the file MLton-LICENSE for details.
*)
functor PackWord (S: sig
type word
val wordSize: int
val isBigEndian: bool
val subArr: Word8.word array * SeqIndex.int -> word
val subVec: Word8.word vector * SeqIndex.int -> word
val update: Word8.word array * SeqIndex.int * word -> unit
val bswap: word -> word
val toLarge: word -> LargeWord.word
val toLargeX: word -> LargeWord.word
val fromLarge: LargeWord.word -> word
end): PACK_WORD_EXTRA =
struct
open S
val bytesPerElem = Int.div (wordSize, 8)
fun offset (i, n) =
let
val () =
if Primitive.Controls.safe
andalso (Int.geu (Int.+ (Int.* (bytesPerElem, i),
Int.- (bytesPerElem, 1)), n))
then raise Subscript
else ()
in
SeqIndex.fromInt i
end
handle Overflow => raise Subscript
val subArrRev = bswap o subArr
val subVecRev = bswap o subVec
fun updateRev (a, i, w) = update (a, i, bswap w)
val (subA, subV, updA) =
if isBigEndian = Primitive.MLton.Platform.Arch.hostIsBigEndian
then (subArr, subVec, update)
else (subArrRev, subVecRev, updateRev)
fun unsafeUpdate (a, i, w) =
let
val i = SeqIndex.fromInt i
val a = Word8Array.toPoly a
in
updA (a, i, fromLarge w)
end
fun update (a, i, w) =
let
val i = offset (i, Word8Array.length a)
val a = Word8Array.toPoly a
in
updA (a, i, fromLarge w)
end
local
fun make (sub, length, toPoly) (av, i) =
let
val i = offset (i, length av)
in
sub (toPoly av, i)
end
in
val subArr = toLarge o (make (subA, Word8Array.length, Word8Array.toPoly))
val subArrX = toLargeX o (make (subA, Word8Array.length, Word8Array.toPoly))
val subVec = toLarge o (make (subV, Word8Vector.length, Word8Vector.toPoly))
val subVecX = toLargeX o (make (subV, Word8Vector.length, Word8Vector.toPoly))
end
local
fun make (sub, length, toPoly) (av, i) =
let
val i = SeqIndex.fromInt i
in
sub (toPoly av, i)
end
in
val unsafeSubArr = toLarge o (make (subA, Word8Array.length, Word8Array.toPoly))
val unsafeSubArrX = toLargeX o (make (subA, Word8Array.length, Word8Array.toPoly))
val unsafeSubVec = toLarge o (make (subV, Word8Vector.length, Word8Vector.toPoly))
val unsafeSubVecX = toLargeX o (make (subV, Word8Vector.length, Word8Vector.toPoly))
end
end
structure PackWord8Big: PACK_WORD_EXTRA =
PackWord (val isBigEndian = true
open Primitive.PackWord8
open Word8)
structure PackWord8Little: PACK_WORD_EXTRA =
PackWord (val isBigEndian = false
open Primitive.PackWord8
open Word8)
structure PackWord8Host: PACK_WORD_EXTRA =
PackWord (val isBigEndian = Primitive.MLton.Platform.Arch.hostIsBigEndian
open Primitive.PackWord8
open Word8)
structure PackWord16Big: PACK_WORD_EXTRA =
PackWord (val isBigEndian = true
open Primitive.PackWord16
open Word16)
structure PackWord16Little: PACK_WORD_EXTRA =
PackWord (val isBigEndian = false
open Primitive.PackWord16
open Word16)
structure PackWord16Host: PACK_WORD_EXTRA =
PackWord (val isBigEndian = Primitive.MLton.Platform.Arch.hostIsBigEndian
open Primitive.PackWord16
open Word16)
structure PackWord32Big: PACK_WORD_EXTRA =
PackWord (val isBigEndian = true
open Primitive.PackWord32
open Word32)
structure PackWord32Little: PACK_WORD_EXTRA =
PackWord (val isBigEndian = false
open Primitive.PackWord32
open Word32)
structure PackWord32Host: PACK_WORD_EXTRA =
PackWord (val isBigEndian = Primitive.MLton.Platform.Arch.hostIsBigEndian
open Primitive.PackWord32
open Word32)
structure PackWord64Big: PACK_WORD_EXTRA =
PackWord (val isBigEndian = true
open Primitive.PackWord64
open Word64)
structure PackWord64Little: PACK_WORD_EXTRA =
PackWord (val isBigEndian = false
open Primitive.PackWord64
open Word64)
structure PackWord64Host: PACK_WORD_EXTRA =
PackWord (val isBigEndian = Primitive.MLton.Platform.Arch.hostIsBigEndian
open Primitive.PackWord64
open Word64)
local
structure PackWord =
struct
local
structure S =
Word_ChooseWordN
(type 'a t = Word8.word array * SeqIndex.t -> 'a
val fWord8 = Primitive.PackWord8.subArr
val fWord16 = Primitive.PackWord16.subArr
val fWord32 = Primitive.PackWord32.subArr
val fWord64 = Primitive.PackWord64.subArr)
in
val subArr = S.f
end
local
structure S =
Word_ChooseWordN
(type 'a t = Word8.word vector * SeqIndex.t -> 'a
val fWord8 = Primitive.PackWord8.subVec
val fWord16 = Primitive.PackWord16.subVec
val fWord32 = Primitive.PackWord32.subVec
val fWord64 = Primitive.PackWord64.subVec)
in
val subVec = S.f
end
local
structure S =
Word_ChooseWordN
(type 'a t = Word8.word array * SeqIndex.t * 'a -> unit
val fWord8 = Primitive.PackWord8.update
val fWord16 = Primitive.PackWord16.update
val fWord32 = Primitive.PackWord32.update
val fWord64 = Primitive.PackWord64.update)
in
val update = S.f
end
end
in
structure PackWordBig: PACK_WORD_EXTRA =
PackWord (val isBigEndian = true
open PackWord
open Word)
structure PackWordLittle: PACK_WORD_EXTRA =
PackWord (val isBigEndian = false
open PackWord
open Word)
structure PackWordHost: PACK_WORD_EXTRA =
PackWord (val isBigEndian = Primitive.MLton.Platform.Arch.hostIsBigEndian
open PackWord
open Word)
end
local
structure PackLargeWord =
struct
local
structure S =
LargeWord_ChooseWordN
(type 'a t = Word8.word array * SeqIndex.t -> 'a
val fWord8 = Primitive.PackWord8.subArr
val fWord16 = Primitive.PackWord16.subArr
val fWord32 = Primitive.PackWord32.subArr
val fWord64 = Primitive.PackWord64.subArr)
in
val subArr = S.f
end
local
structure S =
LargeWord_ChooseWordN
(type 'a t = Word8.word vector * SeqIndex.t -> 'a
val fWord8 = Primitive.PackWord8.subVec
val fWord16 = Primitive.PackWord16.subVec
val fWord32 = Primitive.PackWord32.subVec
val fWord64 = Primitive.PackWord64.subVec)
in
val subVec = S.f
end
local
structure S =
LargeWord_ChooseWordN
(type 'a t = Word8.word array * SeqIndex.t * 'a -> unit
val fWord8 = Primitive.PackWord8.update
val fWord16 = Primitive.PackWord16.update
val fWord32 = Primitive.PackWord32.update
val fWord64 = Primitive.PackWord64.update)
in
val update = S.f
end
end
in
structure PackLargeWordBig: PACK_WORD_EXTRA =
PackWord (val isBigEndian = true
open PackLargeWord
open LargeWord)
structure PackLargeWordLittle: PACK_WORD_EXTRA =
PackWord (val isBigEndian = false
open PackLargeWord
open LargeWord)
structure PackLargeWordHost: PACK_WORD_EXTRA =
PackWord (val isBigEndian = Primitive.MLton.Platform.Arch.hostIsBigEndian
open PackLargeWord
open LargeWord)
end
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