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(* SPDX-License-Identifier: AGPL-3.0-or-later *)
(* Copyright © 2021-2024 OCamlPro *)
(* Written by the Owi programmers *)
(* binary format specification:
https://webassembly.github.io/spec/core/binary/modules.html#binary-importsec *)
open Binary
open Syntax
open Types
module Input : sig
type t
val is_empty : t -> bool
val size : t -> int
val sub_suffix : int -> t -> t Result.t
val sub_prefix : int -> t -> t Result.t
val get : int -> t -> char option
val of_string : string -> t
val sub : pos:int -> len:int -> t -> t Result.t
end = struct
type t =
{ bytes : string
; pt : int
; size : int
}
let size s = s.size
let is_empty input = input.size = 0
let of_string str =
let size = String.length str in
{ bytes = str; pt = 0; size }
let sub ~pos ~len input =
if pos <= input.size && len <= input.size - pos then
Ok { input with pt = input.pt + pos; size = len }
else Error (`Msg (Fmt.str "length out of bounds in section"))
let sub_suffix pos input = sub ~pos ~len:(input.size - pos) input
let sub_prefix len input = sub ~pos:0 ~len input
let get n input =
if n < input.size then Some (String.get input.bytes (input.pt + n))
else None
end
let string_of_char_list char_list =
let buf = Buffer.create 64 in
List.iter (Buffer.add_char buf) char_list;
Buffer.contents buf
let read_byte ~msg input =
match Input.get 0 input with
| None -> Error (`Msg msg)
| Some c ->
let+ next_input = Input.sub_suffix 1 input in
(c, next_input)
(* https://en.wikipedia.org/wiki/LEB128#Unsigned_LEB128 *)
let read_UN n input =
let rec aux n input =
let* () =
if n <= 0 then Error (`Msg "integer representation too long") else Ok ()
in
let* b, input = read_byte ~msg:"integer representation too long" input in
let b = Char.code b in
let* () =
if n >= 7 || b land 0x7f < 1 lsl n then Ok ()
else Error (`Msg "integer too large")
in
let x = Int64.of_int (b land 0x7f) in
if b land 0x80 = 0 then Ok (x, input)
else
(* TODO: make this tail-rec *)
let+ i64, input = aux (n - 7) input in
(Int64.logor x (Int64.shl i64 7L), input)
in
aux n input
let read_U32 input =
let+ i64, input = read_UN 32 input in
(Int64.to_int i64, input)
(* https://en.wikipedia.org/wiki/LEB128#Signed_LEB128 *)
let read_SN n input =
let rec aux n input =
let* () =
if n <= 0 then Error (`Msg "integer representation too long") else Ok ()
in
let* b, input = read_byte ~msg:"integer representation too long" input in
let b = Char.code b in
let mask = (-1 lsl (n - 1)) land 0x7f in
let* () =
if n >= 7 || b land mask = 0 || b land mask = mask then Ok ()
else Error (`Msg "integer too large")
in
let x = Int64.of_int (b land 0x7f) in
if b land 0x80 = 0 then
let x =
if b land 0x40 = 0 then x else Int64.(logor x (logxor (-1L) 0x7fL))
in
Ok (x, input)
else
(* TODO: make this tail-rec *)
let+ i64, input = aux (n - 7) input in
(Int64.logor x (Int64.shl i64 7L), input)
in
aux n input
let read_S7 input =
let+ i64, input = read_SN 7 input in
(Int64.to_int i64, input)
let read_S32 input =
let+ i64, input = read_SN 32 input in
(Int64.to_int32 i64, input)
let read_S33 input =
let+ i64, input = read_SN 33 input in
(i64, input)
let read_S64 input =
let+ i64, input = read_SN 64 input in
(i64, input)
let read_F32 input =
let i32_of_byte input =
let+ b, input = read_byte ~msg:"read_F32" input in
(Int32.of_int (int_of_char b), input)
in
let* i1, input = i32_of_byte input in
let* i2, input = i32_of_byte input in
let* i3, input = i32_of_byte input in
let+ i4, input = i32_of_byte input in
let i32 = Int32.shl i4 24l in
let i32 = Int32.logor i32 (Int32.shl i3 16l) in
let i32 = Int32.logor i32 (Int32.shl i2 8l) in
let i32 = Int32.logor i32 i1 in
(Float32.of_bits i32, input)
let read_F64 input =
let i64_of_byte input =
let+ b, input = read_byte ~msg:"read_F64" input in
(Int64.of_int (int_of_char b), input)
in
let* i1, input = i64_of_byte input in
let* i2, input = i64_of_byte input in
let* i3, input = i64_of_byte input in
let* i4, input = i64_of_byte input in
let* i5, input = i64_of_byte input in
let* i6, input = i64_of_byte input in
let* i7, input = i64_of_byte input in
let+ i8, input = i64_of_byte input in
let i64 = Int64.shl i8 56L in
let i64 = Int64.logor i64 (Int64.shl i7 48L) in
let i64 = Int64.logor i64 (Int64.shl i6 40L) in
let i64 = Int64.logor i64 (Int64.shl i5 32L) in
let i64 = Int64.logor i64 (Int64.shl i4 24L) in
let i64 = Int64.logor i64 (Int64.shl i3 16L) in
let i64 = Int64.logor i64 (Int64.shl i2 8L) in
let i64 = Int64.logor i64 i1 in
(Float64.of_bits i64, input)
let vector parse_elt input =
let* nb_elt, input = read_U32 input in
let rec loop loop_id input acc =
if nb_elt = loop_id then Ok (List.rev acc, input)
else
let* acc_elt, input = parse_elt loop_id input in
let acc = acc_elt :: acc in
loop (loop_id + 1) input acc
in
loop 0 input []
let vector_no_id f input = vector (fun _id -> f) input
let check_end_opcode ?unexpected_eoi_msg input =
let msg = Option.value unexpected_eoi_msg ~default:"END opcode expected" in
match read_byte ~msg input with
| Ok ('\x0B', input) -> Ok input
| Ok (c, _input) ->
Error
(`Msg (Fmt.str "END opcode expected (got %s instead)" (Char.escaped c)))
| Error _ as e -> e
let check_zero_opcode input =
let msg = "zero byte expected" in
match read_byte ~msg input with
| Ok ('\x00', input) -> Ok input
| Ok (c, _input) ->
Error (`Msg (Fmt.str "%s (got %s instead)" msg (Char.escaped c)))
| Error _ as e -> e
let read_bytes ~msg input = vector_no_id (read_byte ~msg) input
let read_indice input : (Types.binary Types.indice * Input.t, _) result =
let+ indice, input = read_U32 input in
(Raw indice, input)
let read_numtype input =
let* b, input = read_S7 input in
match b with
| -0x01 -> Ok (I32, input)
| -0x02 -> Ok (I64, input)
| -0x03 -> Ok (F32, input)
| -0x04 -> Ok (F64, input)
| b -> Error (`Msg (Fmt.str "malformed number type: %d" b))
let read_vectype input =
let* b, _input = read_S7 input in
match b with
| -0x05 ->
(* V128 *)
assert false
| b -> Error (`Msg (Fmt.str "malformed vector type: %d" b))
let read_reftype input =
let* b, input = read_S7 input in
match b with
| -0x10 -> Ok ((Null, Func_ht), input)
| -0x11 -> Ok ((Null, Extern_ht), input)
| b -> Error (`Msg (Fmt.str "malformed reference type: %d" b))
let read_valtype input =
match read_numtype input with
| Ok (t, input) -> Ok (Num_type t, input)
| Error _ -> (
match read_vectype input with
| Ok (_t, _input) -> assert false
| Error _ -> (
match read_reftype input with
| Ok (t, input) -> Ok (Ref_type t, input)
| Error _ as e -> e ) )
let read_valtypes input = vector_no_id read_valtype input
let read_mut input =
let* b, input = read_byte ~msg:"read_mut" input in
match b with
| '\x00' -> Ok (Const, input)
| '\x01' -> Ok (Var, input)
| _c -> Error (`Msg "malformed mutability")
let read_limits input =
let* b, input = read_byte ~msg:"read_limits" input in
match b with
| '\x00' ->
let+ min, input = read_U32 input in
({ min; max = None }, input)
| '\x01' ->
let* min, input = read_U32 input in
let+ max, input = read_U32 input in
({ min; max = Some max }, input)
| _c -> Error (`Msg "integer too large (read_limits)")
let read_memarg max_align input =
let* align, input = read_U32 input in
if align >= max_align then Error (`Msg "malformed memop flags")
else
let+ offset, input = read_U32 input in
let align = Int32.of_int align in
let offset = Int32.of_int offset in
({ align; offset }, input)
let read_FC input =
let* i, input = read_U32 input in
match i with
| 0 -> Ok (I_trunc_sat_f (S32, S32, S), input)
| 1 -> Ok (I_trunc_sat_f (S32, S32, U), input)
| 2 -> Ok (I_trunc_sat_f (S32, S64, S), input)
| 3 -> Ok (I_trunc_sat_f (S32, S64, U), input)
| 4 -> Ok (I_trunc_sat_f (S64, S32, S), input)
| 5 -> Ok (I_trunc_sat_f (S64, S32, U), input)
| 6 -> Ok (I_trunc_sat_f (S64, S64, S), input)
| 7 -> Ok (I_trunc_sat_f (S64, S64, U), input)
| 8 ->
let* dataidx, input = read_indice input in
let+ input = check_zero_opcode input in
(Memory_init dataidx, input)
| 9 ->
let+ dataidx, input = read_indice input in
(Data_drop dataidx, input)
| 10 ->
let* input = check_zero_opcode input in
let+ input = check_zero_opcode input in
(Memory_copy, input)
| 11 ->
let+ input = check_zero_opcode input in
(Memory_fill, input)
| 12 ->
let* elemidx, input = read_indice input in
let+ tableidx, input = read_indice input in
(Table_init (tableidx, elemidx), input)
| 13 ->
let+ elemidx, input = read_indice input in
(Elem_drop elemidx, input)
| 14 ->
let* tableidx1, input = read_indice input in
let+ tableidx2, input = read_indice input in
(Table_copy (tableidx1, tableidx2), input)
| 15 ->
let+ tableidx, input = read_indice input in
(Table_grow tableidx, input)
| 16 ->
let+ tableidx, input = read_indice input in
(Table_size tableidx, input)
| 17 ->
let+ tableidx, input = read_indice input in
(Table_fill tableidx, input)
| i -> Error (`Msg (Fmt.str "illegal opcode (1) %i" i))
let block_type_of_rec_type t =
(* TODO: this is a ugly hack, it is necessary for now and should be removed at some point... *)
match t with
| [ (_id, (_final, _subtypes, Def_func_t (pt, rt))) ] ->
Bt_raw (None, (pt, rt))
| _ -> assert false
let read_block_type types input =
match read_S33 input with
| Ok (i, input) when Int64.ge i 0L ->
let block_type = block_type_of_rec_type types.(Int64.to_int i) in
Ok (block_type, input)
| Error _ | Ok _ -> begin
match read_byte ~msg:"read_block_type" input with
| Ok ('\x40', input) -> Ok (Bt_raw (None, ([], [])), input)
| Error _ | Ok _ ->
let* vt, input = read_valtype input in
let pt, rt = ([], [ vt ]) in
Ok (Bt_raw (None, (pt, rt)), input)
end
let rec read_instr types input =
let* b, input = read_byte ~msg:"read_instr" input in
match b with
| '\x00' -> Ok (Unreachable, input)
| '\x01' -> Ok (Nop, input)
| '\x02' ->
let* bt, input = read_block_type types input in
let* expr, input = read_expr types input in
let+ input = check_end_opcode input in
(Block (None, Some bt, expr), input)
| '\x03' ->
let* bt, input = read_block_type types input in
let* expr, input = read_expr types input in
let+ input = check_end_opcode input in
(Loop (None, Some bt, expr), input)
| '\x04' ->
let* bt, input = read_block_type types input in
let* expr1, input = read_expr types input in
let* expr2, input =
begin
match read_byte ~msg:"read_instr (0x04)" input with
| Ok ('\x05', input) -> read_expr types input
| Ok _ | Error _ -> Ok ([], input)
end
in
let+ input = check_end_opcode input in
(If_else (None, Some bt, expr1, expr2), input)
| '\x05' -> Error (`Msg "misplaced ELSE opcode")
| '\x0B' -> Error (`Msg "misplaced END opcode")
| '\x0C' ->
let+ labelidx, input = read_indice input in
(Br labelidx, input)
| '\x0D' ->
let+ labelidx, input = read_indice input in
(Br_if labelidx, input)
| '\x0E' ->
let* xs, input = vector_no_id read_indice input in
let xs = Array.of_list xs in
let+ x, input = read_indice input in
(Br_table (xs, x), input)
| '\x0F' -> Ok (Return, input)
| '\x10' ->
let+ funcidx, input = read_indice input in
(Call funcidx, input)
| '\x11' ->
let* Raw typeidx, input = read_indice input in
let+ tableidx, input = read_indice input in
(Call_indirect (tableidx, block_type_of_rec_type types.(typeidx)), input)
| '\x1A' -> Ok (Drop, input)
| '\x1B' -> Ok (Select None, input)
| '\x1C' ->
let+ valtypes, input = read_valtypes input in
(Select (Some valtypes), input)
| '\x20' ->
let+ localidx, input = read_indice input in
(Local_get localidx, input)
| '\x21' ->
let+ localidx, input = read_indice input in
(Local_set localidx, input)
| '\x22' ->
let+ localidx, input = read_indice input in
(Local_tee localidx, input)
| '\x23' ->
let+ globalidx, input = read_indice input in
(Global_get globalidx, input)
| '\x24' ->
let+ globalidx, input = read_indice input in
(Global_set globalidx, input)
| '\x25' ->
let+ tableidx, input = read_indice input in
(Table_get tableidx, input)
| '\x26' ->
let+ tableidx, input = read_indice input in
(Table_set tableidx, input)
| '\x28' ->
let+ memarg, input = read_memarg 32 input in
(I_load (S32, memarg), input)
| '\x29' ->
let+ memarg, input = read_memarg 64 input in
(I_load (S64, memarg), input)
| '\x2A' ->
let+ memarg, input = read_memarg 32 input in
(F_load (S32, memarg), input)
| '\x2B' ->
let+ memarg, input = read_memarg 64 input in
(F_load (S64, memarg), input)
| '\x2C' ->
let+ memarg, input = read_memarg 32 input in
(I_load8 (S32, S, memarg), input)
| '\x2D' ->
let+ memarg, input = read_memarg 32 input in
(I_load8 (S32, U, memarg), input)
| '\x2E' ->
let+ memarg, input = read_memarg 32 input in
(I_load16 (S32, S, memarg), input)
| '\x2F' ->
let+ memarg, input = read_memarg 32 input in
(I_load16 (S32, U, memarg), input)
| '\x30' ->
let+ memarg, input = read_memarg 64 input in
(I_load8 (S64, S, memarg), input)
| '\x31' ->
let+ memarg, input = read_memarg 64 input in
(I_load8 (S64, U, memarg), input)
| '\x32' ->
let+ memarg, input = read_memarg 64 input in
(I_load16 (S64, S, memarg), input)
| '\x33' ->
let+ memarg, input = read_memarg 64 input in
(I_load16 (S64, U, memarg), input)
| '\x34' ->
let+ memarg, input = read_memarg 32 input in
(I64_load32 (S, memarg), input)
| '\x35' ->
let+ memarg, input = read_memarg 32 input in
(I64_load32 (U, memarg), input)
| '\x36' ->
let+ memarg, input = read_memarg 32 input in
(I_store (S32, memarg), input)
| '\x37' ->
let+ memarg, input = read_memarg 64 input in
(I_store (S64, memarg), input)
| '\x38' ->
let+ memarg, input = read_memarg 32 input in
(F_store (S32, memarg), input)
| '\x39' ->
let+ memarg, input = read_memarg 64 input in
(F_store (S64, memarg), input)
| '\x3A' ->
let+ memarg, input = read_memarg 32 input in
(I_store8 (S32, memarg), input)
| '\x3B' ->
let+ memarg, input = read_memarg 32 input in
(I_store16 (S32, memarg), input)
| '\x3C' ->
let+ memarg, input = read_memarg 64 input in
(I_store8 (S64, memarg), input)
| '\x3D' ->
let+ memarg, input = read_memarg 64 input in
(I_store16 (S64, memarg), input)
| '\x3E' ->
let+ memarg, input = read_memarg 32 input in
(I64_store32 memarg, input)
| '\x3F' ->
let+ input = check_zero_opcode input in
(Memory_size, input)
| '\x40' ->
let+ input = check_zero_opcode input in
(Memory_grow, input)
| '\x41' ->
let+ i32, input = read_S32 input in
(I32_const i32, input)
| '\x42' ->
let+ i64, input = read_S64 input in
(I64_const i64, input)
| '\x43' ->
let+ f32, input = read_F32 input in
(F32_const f32, input)
| '\x44' ->
let+ f64, input = read_F64 input in
(F64_const f64, input)
| '\x45' -> Ok (I_testop (S32, Eqz), input)
| '\x46' -> Ok (I_relop (S32, Eq), input)
| '\x47' -> Ok (I_relop (S32, Ne), input)
| '\x48' -> Ok (I_relop (S32, Lt S), input)
| '\x49' -> Ok (I_relop (S32, Lt U), input)
| '\x4A' -> Ok (I_relop (S32, Gt S), input)
| '\x4B' -> Ok (I_relop (S32, Gt U), input)
| '\x4C' -> Ok (I_relop (S32, Le S), input)
| '\x4D' -> Ok (I_relop (S32, Le U), input)
| '\x4E' -> Ok (I_relop (S32, Ge S), input)
| '\x4F' -> Ok (I_relop (S32, Ge U), input)
| '\x50' -> Ok (I_testop (S64, Eqz), input)
| '\x51' -> Ok (I_relop (S64, Eq), input)
| '\x52' -> Ok (I_relop (S64, Ne), input)
| '\x53' -> Ok (I_relop (S64, Lt S), input)
| '\x54' -> Ok (I_relop (S64, Lt U), input)
| '\x55' -> Ok (I_relop (S64, Gt S), input)
| '\x56' -> Ok (I_relop (S64, Gt U), input)
| '\x57' -> Ok (I_relop (S64, Le S), input)
| '\x58' -> Ok (I_relop (S64, Le U), input)
| '\x59' -> Ok (I_relop (S64, Ge S), input)
| '\x5A' -> Ok (I_relop (S64, Ge U), input)
| '\x5B' -> Ok (F_relop (S32, Eq), input)
| '\x5C' -> Ok (F_relop (S32, Ne), input)
| '\x5D' -> Ok (F_relop (S32, Lt), input)
| '\x5E' -> Ok (F_relop (S32, Gt), input)
| '\x5F' -> Ok (F_relop (S32, Le), input)
| '\x60' -> Ok (F_relop (S32, Ge), input)
| '\x61' -> Ok (F_relop (S64, Eq), input)
| '\x62' -> Ok (F_relop (S64, Ne), input)
| '\x63' -> Ok (F_relop (S64, Lt), input)
| '\x64' -> Ok (F_relop (S64, Gt), input)
| '\x65' -> Ok (F_relop (S64, Le), input)
| '\x66' -> Ok (F_relop (S64, Ge), input)
| '\x67' -> Ok (I_unop (S32, Clz), input)
| '\x68' -> Ok (I_unop (S32, Ctz), input)
| '\x69' -> Ok (I_unop (S32, Popcnt), input)
| '\x6A' -> Ok (I_binop (S32, Add), input)
| '\x6B' -> Ok (I_binop (S32, Sub), input)
| '\x6C' -> Ok (I_binop (S32, Mul), input)
| '\x6D' -> Ok (I_binop (S32, Div S), input)
| '\x6E' -> Ok (I_binop (S32, Div U), input)
| '\x6F' -> Ok (I_binop (S32, Rem S), input)
| '\x70' -> Ok (I_binop (S32, Rem U), input)
| '\x71' -> Ok (I_binop (S32, And), input)
| '\x72' -> Ok (I_binop (S32, Or), input)
| '\x73' -> Ok (I_binop (S32, Xor), input)
| '\x74' -> Ok (I_binop (S32, Shl), input)
| '\x75' -> Ok (I_binop (S32, Shr S), input)
| '\x76' -> Ok (I_binop (S32, Shr U), input)
| '\x77' -> Ok (I_binop (S32, Rotl), input)
| '\x78' -> Ok (I_binop (S32, Rotr), input)
| '\x79' -> Ok (I_unop (S64, Clz), input)
| '\x7A' -> Ok (I_unop (S64, Ctz), input)
| '\x7B' -> Ok (I_unop (S64, Popcnt), input)
| '\x7C' -> Ok (I_binop (S64, Add), input)
| '\x7D' -> Ok (I_binop (S64, Sub), input)
| '\x7E' -> Ok (I_binop (S64, Mul), input)
| '\x7F' -> Ok (I_binop (S64, Div S), input)
| '\x80' -> Ok (I_binop (S64, Div U), input)
| '\x81' -> Ok (I_binop (S64, Rem S), input)
| '\x82' -> Ok (I_binop (S64, Rem U), input)
| '\x83' -> Ok (I_binop (S64, And), input)
| '\x84' -> Ok (I_binop (S64, Or), input)
| '\x85' -> Ok (I_binop (S64, Xor), input)
| '\x86' -> Ok (I_binop (S64, Shl), input)
| '\x87' -> Ok (I_binop (S64, Shr S), input)
| '\x88' -> Ok (I_binop (S64, Shr U), input)
| '\x89' -> Ok (I_binop (S64, Rotl), input)
| '\x8A' -> Ok (I_binop (S64, Rotr), input)
| '\x8B' -> Ok (F_unop (S32, Abs), input)
| '\x8C' -> Ok (F_unop (S32, Neg), input)
| '\x8D' -> Ok (F_unop (S32, Ceil), input)
| '\x8E' -> Ok (F_unop (S32, Floor), input)
| '\x8F' -> Ok (F_unop (S32, Trunc), input)
| '\x90' -> Ok (F_unop (S32, Nearest), input)
| '\x91' -> Ok (F_unop (S32, Sqrt), input)
| '\x92' -> Ok (F_binop (S32, Add), input)
| '\x93' -> Ok (F_binop (S32, Sub), input)
| '\x94' -> Ok (F_binop (S32, Mul), input)
| '\x95' -> Ok (F_binop (S32, Div), input)
| '\x96' -> Ok (F_binop (S32, Min), input)
| '\x97' -> Ok (F_binop (S32, Max), input)
| '\x98' -> Ok (F_binop (S32, Copysign), input)
| '\x99' -> Ok (F_unop (S64, Abs), input)
| '\x9A' -> Ok (F_unop (S64, Neg), input)
| '\x9B' -> Ok (F_unop (S64, Ceil), input)
| '\x9C' -> Ok (F_unop (S64, Floor), input)
| '\x9D' -> Ok (F_unop (S64, Trunc), input)
| '\x9E' -> Ok (F_unop (S64, Nearest), input)
| '\x9F' -> Ok (F_unop (S64, Sqrt), input)
| '\xA0' -> Ok (F_binop (S64, Add), input)
| '\xA1' -> Ok (F_binop (S64, Sub), input)
| '\xA2' -> Ok (F_binop (S64, Mul), input)
| '\xA3' -> Ok (F_binop (S64, Div), input)
| '\xA4' -> Ok (F_binop (S64, Min), input)
| '\xA5' -> Ok (F_binop (S64, Max), input)
| '\xA6' -> Ok (F_binop (S64, Copysign), input)
| '\xA7' -> Ok (I32_wrap_i64, input)
| '\xA8' -> Ok (I_trunc_f (S32, S32, S), input)
| '\xA9' -> Ok (I_trunc_f (S32, S32, U), input)
| '\xAA' -> Ok (I_trunc_f (S32, S64, S), input)
| '\xAB' -> Ok (I_trunc_f (S32, S64, U), input)
| '\xAC' -> Ok (I64_extend_i32 S, input)
| '\xAD' -> Ok (I64_extend_i32 U, input)
| '\xAE' -> Ok (I_trunc_f (S64, S32, S), input)
| '\xAF' -> Ok (I_trunc_f (S64, S32, U), input)
| '\xB0' -> Ok (I_trunc_f (S64, S64, S), input)
| '\xB1' -> Ok (I_trunc_f (S64, S64, U), input)
| '\xB2' -> Ok (F_convert_i (S32, S32, S), input)
| '\xB3' -> Ok (F_convert_i (S32, S32, U), input)
| '\xB4' -> Ok (F_convert_i (S32, S64, S), input)
| '\xB5' -> Ok (F_convert_i (S32, S64, U), input)
| '\xB6' -> Ok (F32_demote_f64, input)
| '\xB7' -> Ok (F_convert_i (S64, S32, S), input)
| '\xB8' -> Ok (F_convert_i (S64, S32, U), input)
| '\xB9' -> Ok (F_convert_i (S64, S64, S), input)
| '\xBA' -> Ok (F_convert_i (S64, S64, U), input)
| '\xBB' -> Ok (F64_promote_f32, input)
| '\xBC' -> Ok (I_reinterpret_f (S32, S32), input)
| '\xBD' -> Ok (I_reinterpret_f (S64, S64), input)
| '\xBE' -> Ok (F_reinterpret_i (S32, S32), input)
| '\xBF' -> Ok (F_reinterpret_i (S64, S64), input)
| '\xC0' -> Ok (I_extend8_s S32, input)
| '\xC1' -> Ok (I_extend16_s S32, input)
| '\xC2' -> Ok (I_extend8_s S64, input)
| '\xC3' -> Ok (I_extend16_s S64, input)
| '\xC4' -> Ok (I64_extend32_s, input)
| '\xD0' ->
let+ (_null, reftype), input = read_reftype input in
(Ref_null reftype, input)
| '\xD1' -> Ok (Ref_is_null, input)
| '\xD2' ->
let+ funcidx, input = read_indice input in
(Ref_func funcidx, input)
| '\xFC' -> read_FC input
| c -> Error (`Msg (Fmt.str "illegal opcode (2) %s" (Char.escaped c)))
and read_expr types input =
let rec aux acc input =
match read_byte ~msg:"read_expr" input with
| Ok (('\x05' | '\x0B'), _) -> Ok (List.rev acc, input)
| Error _ -> Ok (List.rev acc, input)
| Ok _ ->
let* instr, input = read_instr types input in
aux (instr :: acc) input
in
aux [] input
let read_const types input =
let* c, input = read_expr types input in
let+ input = check_end_opcode input in
(c, input)
type ('a, 'b) import =
| Func of int
| Table of limits * 'a ref_type
| Mem of limits
| Global of mut * 'b val_type
let magic_check str =
if String.length str < 4 then Error (`Msg "unexpected end")
else
let magic = String.sub str 0 4 in
if String.equal magic "\x00\x61\x73\x6d" then Ok ()
else Error (`Msg "magic header not detected")
let version_check str =
if String.length str < 8 then Error (`Msg "unexpected end")
else
let version = String.sub str 4 4 in
if String.equal version "\x01\x00\x00\x00" then Ok ()
else Error (`Msg "unknown binary version")
let check_section_id = function
| '\x00' .. '\x0C' -> Ok ()
| c -> Error (`Msg (Fmt.str "malformed section id %s" (Char.escaped c)))
let section_parse input ~expected_id default section_content_parse =
match Input.get 0 input with
| Some id when Char.equal id expected_id ->
let* () = check_section_id id in
let* input = Input.sub_suffix 1 input in
let* () =
if Input.size input = 0 then Error (`Msg "unexpected end") else Ok ()
in
let* size, input = read_U32 input in
let* () =
if size > Input.size input then Error (`Msg "length out of bounds")
else Ok ()
in
let* section_input = Input.sub_prefix size input in
let* next_input = Input.sub_suffix size input in
let* res, after_section_input = section_content_parse section_input in
if Input.size after_section_input > 0 then
Error (`Msg "section size mismatch")
else Ok (res, next_input)
| None -> Ok (default, input)
| Some id ->
let* () = check_section_id id in
Ok (default, input)
let parse_utf8_name input =
let* () =
if Input.size input = 0 then Error (`Msg "unexpected end") else Ok ()
in
let* name, input = read_bytes ~msg:"parse_utf8_name" input in
let name = string_of_char_list name in
let+ () = Wutf8.check_utf8 name in
(name, input)
let section_custom input =
let consume_to_end x input =
let+ input = Input.sub ~pos:0 ~len:0 input in
(x, input)
in
section_parse input ~expected_id:'\x00' None @@ fun input ->
let* name, input = parse_utf8_name input in
let+ (), input = consume_to_end () input in
(Some name, input)
let read_type _id input =
let* fcttype, input = read_byte ~msg:"read_type" input in
let* () =
match fcttype with
| '\x60' -> Ok ()
| _ -> Error (`Msg "integer representation too long")
in
let* params, input = read_valtypes input in
let+ results, input = read_valtypes input in
let params = List.map (fun param -> (None, param)) params in
([ (None, (Final, [], Def_func_t (params, results))) ], input)
let read_global_type input =
let* val_type, input = read_valtype input in
let+ mut, input = read_mut input in
((mut, val_type), input)
let read_import input =
let* modul, input = parse_utf8_name input in
let* name, input = parse_utf8_name input in
let* import_typeidx, input = read_byte ~msg:"read_import" input in
match import_typeidx with
| '\x00' ->
let+ typeidx, input = read_U32 input in
((modul, name, Func typeidx), input)
| '\x01' ->
let* ref_type, input = read_reftype input in
let+ limits, input = read_limits input in
((modul, name, Table (limits, ref_type)), input)
| '\x02' ->
let+ limits, input = read_limits input in
((modul, name, Mem limits), input)
| '\x03' ->
let+ (mut, val_type), input = read_global_type input in
((modul, name, Global (mut, val_type)), input)
| _c -> Error (`Msg "malformed import kind")
let read_table input =
let* ref_type, input = read_reftype input in
let+ limits, input = read_limits input in
((limits, ref_type), input)
let read_memory input =
let+ limits, input = read_limits input in
((None, limits), input)
let read_global types input =
let* typ, input = read_global_type input in
let+ init, input = read_const types input in
({ typ; init; id = None }, input)
let read_export input =
let* name, input = read_bytes ~msg:"read_export 1" input in
let name = string_of_char_list name in
let* export_typeidx, input = read_byte ~msg:"read_export 2" input in
let+ id, input = read_U32 input in
((export_typeidx, { id; name }), input)
let read_elem_active types input =
let* Raw index, input = read_indice input in
let+ offset, input = read_const types input in
(Elem_active (Some index, offset), input)
let read_elem_active_zero types input =
let+ offset, input = read_const types input in
(Elem_active (Some 0, offset), input)
let read_elem_index input =
let+ index, input = read_indice input in
([ Ref_func index ], input)
let read_elem_kind input =
let msg = "malformed element kind" in
match read_byte ~msg input with
| Ok ('\x00', input) -> Ok ((Null, Func_ht), input)
| Ok (c, _input) ->
Error (`Msg (Fmt.str "%s (expected 0x00 but got %s)" msg (Char.escaped c)))
| Error _ as e -> e
let read_element types input =
let* i, input = read_U32 input in
let id = None in
match i with
| 0 ->
let* mode, input = read_elem_active_zero types input in
let+ init, input = vector_no_id read_elem_index input in
let typ = (Null, Func_ht) in
({ id; typ; init; mode }, input)
| 1 ->
let mode = Elem_passive in
let* typ, input = read_elem_kind input in
let+ init, input = vector_no_id read_elem_index input in
({ id; typ; init; mode }, input)
| 2 ->
let* mode, input = read_elem_active types input in
let* typ, input = read_elem_kind input in
let+ init, input = vector_no_id read_elem_index input in
({ id; typ; init; mode }, input)
| 3 ->
let mode = Elem_declarative in
let* typ, input = read_elem_kind input in
let+ init, input = vector_no_id read_elem_index input in
({ id; typ; init; mode }, input)
| 4 ->
let* mode, input = read_elem_active_zero types input in
let+ init, input = vector_no_id (read_const types) input in
let typ = (Null, Func_ht) in
({ id; typ; init; mode }, input)
| 5 ->
let mode = Elem_passive in
let* typ, input = read_reftype input in
let+ init, input = vector_no_id (read_const types) input in
({ id; typ; init; mode }, input)
| 6 ->
let* mode, input = read_elem_active types input in
let* typ, input = read_reftype input in
let+ init, input = vector_no_id (read_const types) input in
({ id; typ; init; mode }, input)
| 7 ->
let mode = Elem_declarative in
let* typ, input = read_reftype input in
let+ init, input = vector_no_id (read_const types) input in
({ id; typ; init; mode }, input)
| i -> Error (`Msg (Fmt.str "malformed elements segment kind: %d" i))
let read_local input =
let* n, input = read_U32 input in
let+ t, input = read_valtype input in
((n, t), input)
let read_locals input =
let* nts, input = vector_no_id read_local input in
let ns =
List.map (fun (n, _t) -> Convert.Int64.extend_i32_u @@ Int32.of_int n) nts
in
let+ () =
if not @@ Int64.lt_u (List.fold_left Int64.add 0L ns) 0x1_0000_0000L then
Error (`Msg "too many locals")
else Ok ()
in
let locals = List.map (fun (n, t) -> List.init n (fun _i -> (None, t))) nts in
let locals = List.flatten locals in
(locals, input)
let read_code types input =
let* size, input = read_U32 input in
let* code_input = Input.sub_prefix size input in
let* next_input = Input.sub_suffix size input in
let* locals, code_input = read_locals code_input in
let* code, code_input = read_expr types code_input in
let* () =
if Input.size code_input = 0 && Input.size next_input = 0 then
Error (`Msg "unexpected end of section or function")
else Ok ()
in
let* code_input =
check_end_opcode ~unexpected_eoi_msg:"unexpected end of section or function"
code_input
in
if Input.size code_input > 0 then
Error (`Msg "unexpected end of section or function")
else Ok ((locals, code), next_input)
(* TODO: merge Elem and Data modes ? *)
let read_data_active types input =
let* Raw index, input = read_indice input in
let+ offset, input = read_const types input in
(Data_active (index, offset), input)
let read_data_active_zero types input =
let+ offset, input = read_const types input in
(Data_active (0, offset), input)
let read_data types input =
let* i, input = read_U32 input in
let id = None in
match i with
| 0 ->
let* mode, input = read_data_active_zero types input in
let+ init, input = read_bytes ~msg:"read_data 0" input in
let init = string_of_char_list init in
({ id; init; mode }, input)
| 1 ->
let mode = Data_passive in
let+ init, input = read_bytes ~msg:"read_data 1" input in
let init = string_of_char_list init in
({ id; init; mode }, input)
| 2 ->
let* mode, input = read_data_active types input in
let+ init, input = read_bytes ~msg:"read_data 2" input in
let init = string_of_char_list init in
({ id; init; mode }, input)
| i -> Error (`Msg (Fmt.str "malformed data segment kind %d" i))
let parse_many_custom_section input =
let rec aux acc input =
let* custom_section, input = section_custom input in
match custom_section with
| None -> Ok (List.rev acc, input)
| Some _ as custom_section -> aux (custom_section :: acc) input
in
aux [] input
let sections_iterate (input : Input.t) =
(* Custom *)
let* _custom_sections, input = parse_many_custom_section input in
(* Type *)
let* types, input =
section_parse input ~expected_id:'\x01' [] (vector read_type)
in
let types = Array.of_list types in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Imports *)
let* import_section, input =
section_parse input ~expected_id:'\x02' [] (vector_no_id read_import)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Function *)
let* function_section, input =
section_parse input ~expected_id:'\x03' [] (vector_no_id read_U32)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Tables *)
let* table_section, input =
section_parse input ~expected_id:'\x04' [] (vector_no_id read_table)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Memory *)
let* memory_section, input =
section_parse input ~expected_id:'\x05' [] (vector_no_id read_memory)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Globals *)
let* global_section, input =
section_parse input ~expected_id:'\x06' []
(vector_no_id (read_global types))
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Exports *)
let* export_section, input =
section_parse input ~expected_id:'\x07' [] (vector_no_id read_export)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Start *)
let* start_section, input =
section_parse input ~expected_id:'\x08' None @@ fun input ->
let+ idx_start_func, input = read_U32 input in
(Some idx_start_func, input)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Elements *)
let* element_section, input =
section_parse input ~expected_id:'\x09' []
@@ vector_no_id (read_element types)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Data_count *)
let* data_count_section, input =
section_parse input ~expected_id:'\x0C' None @@ fun input ->
let+ i, input = read_U32 input in
(Some i, input)
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Code *)
let* code_section, input =
section_parse input ~expected_id:'\x0A' [] (vector_no_id (read_code types))
in
let* () =
if List.compare_lengths function_section code_section <> 0 then
Error (`Msg "function and code section have inconsistent lengths")
else Ok ()
in
(* Custom *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
(* Data *)
let+ data, input =
section_parse input ~expected_id:'\x0B' [] (vector_no_id (read_data types))
in
let data = Array.of_list data in
let* () =
match (Array.length data, data_count_section) with
| 0, None -> Ok ()
| _data_len, None ->
let code_use_dataidx = ref false in
let f_iter = function
| Data_drop _ | Memory_init _ -> code_use_dataidx := true
| _ -> ()
in
let expr = List.concat_map snd code_section in
iter_expr f_iter expr;
if !code_use_dataidx then Error (`Msg "data count section required")
else Ok ()
| data_len, Some data_count when data_len = data_count -> Ok ()
| _ -> Error (`Msg "data count and data section have inconsistent lengths")
in
(* Custom *)
(* TODO: actually use the various custom sections *)
let* _custom_sections', input = parse_many_custom_section input in
let _custom_sections = _custom_sections @ _custom_sections' in
let+ () =
if not @@ Input.is_empty input then Error (`Msg "malformed section id")
else Ok ()
in
(* Memories *)
let mem =
let local = List.map (fun mem -> Runtime.Local mem) memory_section in
let imported =
List.filter_map
(function
| modul, name, Mem desc ->
Option.some
@@ Runtime.Imported { modul; name; assigned_name = None; desc }
| _not_a_memory_import -> None )
import_section
in
Array.of_list (imported @ local)
in
(* Globals *)
let global =
let local = List.map (fun g -> Runtime.Local g) global_section in
let imported =
List.filter_map
(function
| modul, name, Global (mut, val_type) ->
Option.some
@@ Runtime.Imported
{ modul; name; assigned_name = None; desc = (mut, val_type) }
| _not_a_global_import -> None )
import_section
in
Array.of_list (imported @ local)
in
(* Functions *)
let func =
let local =
List.map2
(fun typeidx (locals, body) ->
Runtime.Local
{ type_f = block_type_of_rec_type types.(typeidx)
; locals
; body
; id = None
} )
function_section code_section
in
let imported =
List.filter_map
(function
| modul, name, Func typeidx ->
Option.some
@@ Runtime.Imported
{ modul
; name
; assigned_name = None
; desc = block_type_of_rec_type types.(typeidx)
}
| _not_a_function_import -> None )
import_section
in
Array.of_list (imported @ local)
in
(* Tables *)
let table =
let local = List.map (fun tbl -> Runtime.Local (None, tbl)) table_section in
let imported =
List.filter_map
(function
| modul, name, Table (limits, ref_type) ->
Option.some
@@ Runtime.Imported
{ modul
; name
; assigned_name = None
; desc = (limits, ref_type)
}
| _not_a_table_import -> None )
import_section
in
Array.of_list (imported @ local)
in
(* Elems *)
let elem = Array.of_list element_section in
(* Exports *)
let empty_exports = { global = []; mem = []; table = []; func = [] } in
let exports =
List.fold_left
(fun (exports : exports) (export_typeidx, export) ->
match export_typeidx with
| '\x00' ->
let func = export :: exports.func in
{ exports with func }
| '\x01' ->
let table = export :: exports.table in
{ exports with table }
| '\x02' ->
let mem = export :: exports.mem in
{ exports with mem }
| '\x03' ->
let global = export :: exports.global in
{ exports with global }
| _ -> Fmt.failwith "read_exportdesc error" )
empty_exports export_section
in
let exports =
{ func = List.rev exports.func
; table = List.rev exports.table
; mem = List.rev exports.mem
; global = List.rev exports.global
}
in
{ id = None
; types
; global
; mem
; elem
; func
; table
; start = start_section
; data
; exports
}
let from_string content =
let* () = magic_check content in
let* () = version_check content in
let* input = Input.of_string content |> Input.sub_suffix 8 in
let* m = sections_iterate input in
m
let from_channel chan =
let content = In_channel.input_all chan in
from_string content
let from_file (filename : Fpath.t) =
let* res =
Bos.OS.File.with_ic filename (fun chan () -> from_channel chan) ()
in
res