Source file binary_size.ml

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(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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let bool = 1

let int8 = 1

let uint8 = 1

let char = 1

let int16 = 2

let uint16 = 2

let uint30 = 4

let uint32 = 4

let uint64 = 8

let int31 = 4

let int32 = 4

let int64 = 8

let float = 8

type tag_size = [`Uint8 | `Uint16]

let tag_size = function `Uint8 -> uint8 | `Uint16 -> uint16

type signed_integer = [`Int31 | `Int16 | `Int8]

type unsigned_integer = [`Uint30 | `Uint16 | `Uint8]

type integer = [signed_integer | unsigned_integer]

let signed_range_to_size min max : [> signed_integer] =
  if min >= ~-128 && max <= 127 then `Int8
  else if min >= ~-32_768 && max <= 32_767 then `Int16
  else `Int31

(* max should be centered at zero *)
let unsigned_range_to_size max : [> unsigned_integer] =
  assert (max >= 0);
  if max <= 255 then `Uint8 else if max <= 65535 then `Uint16 else `Uint30

let integer_to_size = function
  | `Int31 -> int31
  | `Int16 -> int16
  | `Int8 -> int8
  | `Uint30 -> uint30
  | `Uint16 -> uint16
  | `Uint8 -> uint8

let max_int = function
  | `Uint30 | `Int31 -> (1 lsl 30) - 1
  | `Int16 -> (1 lsl 15) - 1
  | `Int8 -> (1 lsl 7) - 1
  | `Uint16 -> (1 lsl 16) - 1
  | `Uint8 -> (1 lsl 8) - 1

let min_int = function
  | `Uint8 | `Uint16 | `Uint30 -> 0
  | `Int31 -> -(1 lsl 30)
  | `Int16 -> -(1 lsl 15)
  | `Int8 -> -(1 lsl 7)

let range_to_size ~minimum ~maximum : integer =
  if minimum < 0 then signed_range_to_size minimum maximum
  else unsigned_range_to_size (maximum - minimum)

let enum_size arr = unsigned_range_to_size (Array.length arr)