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(* SPDX-License-Identifier: AGPL-3.0-or-later *)
(* Copyright © 2021-2024 OCamlPro *)
(* Written by the Owi programmers *)
open Types
open Binary
open Syntax
open Format
type typ =
| Num_type of num_type
| Ref_type of binary heap_type
| Any
| Something
let pp_typ fmt = function
| Num_type t -> pp_num_type fmt t
| Ref_type t -> pp_heap_type fmt t
| Any -> pp_string fmt "any"
| Something -> pp_string fmt "something"
let pp_typ_list fmt l = pp_list ~pp_sep:pp_space pp_typ fmt l
let typ_of_val_type = function
| Types.Ref_type (_null, t) -> Ref_type t
| Num_type t -> Num_type t
let typ_of_pt pt = typ_of_val_type @@ snd pt
module Index = struct
module M = Int
module Map = Map.Make (Int)
include M
end
module Env = struct
type t =
{ locals : typ Index.Map.t
; globals : (global, binary global_type) Runtime.t Named.t
; result_type : binary result_type
; funcs : (binary func, binary block_type) Runtime.t Named.t
; blocks : typ list list
; tables : (binary table, binary table_type) Runtime.t Named.t
; elems : elem Named.t
; refs : (int, unit) Hashtbl.t
}
let local_get i env = match Index.Map.find i env.locals with v -> v
let global_get i env =
let value = Indexed.get_at_exn i env.globals.values in
let _mut, typ =
match value with Local { typ; _ } -> typ | Runtime.Imported t -> t.desc
in
typ
let func_get i env =
let value = Indexed.get_at_exn i env.funcs.values in
match value with
| Local { type_f; _ } ->
let (Bt_raw ((None | Some _), t)) = type_f in
t
| Runtime.Imported t ->
let (Bt_raw ((None | Some _), t)) = t.desc in
t
let block_type_get i env =
match List.nth_opt env.blocks i with
| None -> Error `Unknown_label
| Some bt -> Ok bt
let table_type_get_from_module i (modul : Binary.modul) =
let value = Indexed.get_at_exn i modul.table.values in
match value with
| Local table -> snd (snd table)
| Runtime.Imported t -> snd t.desc
let table_type_get i env =
let value = Indexed.get_at_exn i env.tables.values in
match value with
| Local table -> snd (snd table)
| Runtime.Imported t -> snd t.desc
let elem_type_get i env =
let value = Indexed.get_at_exn i env.elems.values in
value.typ
let make ~params ~locals ~globals ~funcs ~result_type ~tables ~elems ~refs =
let l = List.mapi (fun i v -> (i, v)) (params @ locals) in
let locals =
List.fold_left
(fun locals (i, (_, typ)) ->
let typ = typ_of_val_type typ in
Index.Map.add i typ locals )
Index.Map.empty l
in
{ locals; globals; result_type; funcs; tables; elems; blocks = []; refs }
end
type env = Env.t
type stack = typ list
let i32 = Num_type I32
let i64 = Num_type I64
let f32 = Num_type F32
let f64 = Num_type F64
let i31 = Ref_type I31_ht
let any = Any
let itype = function S32 -> i32 | S64 -> i64
let ftype = function S32 -> f32 | S64 -> f64
let arraytype _modul _i = (* TODO *) assert false
module Stack : sig
type t = typ list
val drop : t -> t Result.t
val pop : t -> t -> t Result.t
val push : t -> t -> t Result.t
val pop_push : binary block_type -> t -> t Result.t
val pop_ref : t -> t Result.t
val equal : t -> t -> bool
val match_ref_type : binary heap_type -> binary heap_type -> bool
val match_types : typ -> typ -> bool
val pp : formatter -> t -> unit
val match_prefix : prefix:t -> stack:t -> t option
end = struct
type t = typ list
let pp fmt (s : stack) = pp fmt "[%a]" pp_typ_list s
let match_num_type (required : num_type) (got : num_type) =
match (required, got) with
| I32, I32 -> true
| I64, I64 -> true
| F32, F32 -> true
| F64, F64 -> true
| _, _ -> false
let match_ref_type required got =
match (required, got) with
| Any_ht, _ -> true
| None_ht, None_ht -> true
| Eq_ht, Eq_ht -> true
| I31_ht, I31_ht -> true
| Struct_ht, Struct_ht -> true
| Array_ht, Array_ht -> true
| No_func_ht, No_func_ht -> true
| Func_ht, Func_ht -> true
| Extern_ht, Extern_ht -> true
| No_extern_ht, No_extern_ht -> true
| _ ->
(* TODO: complete this *)
false
let match_types required got =
match (required, got) with
| Something, _ | _, Something -> true
| Any, _ | _, Any -> true
| Num_type required, Num_type got -> match_num_type required got
| Ref_type required, Ref_type got -> match_ref_type required got
| Num_type _, Ref_type _ | Ref_type _, Num_type _ -> false
let rec equal s s' =
match (s, s') with
| [], s | s, [] -> List.for_all (( = ) Any) s
| Any :: tl, Any :: tl' -> equal tl s' || equal s tl'
| Any :: tl, hd :: tl' | hd :: tl', Any :: tl ->
equal tl (hd :: tl') || equal (Any :: tl) tl'
| hd :: tl, hd' :: tl' -> match_types hd hd' && equal tl tl'
let ( ||| ) l r = match (l, r) with None, v | v, None -> v | _l, r -> r
let rec match_prefix ~prefix ~stack =
match (prefix, stack) with
| [], stack -> Some stack
| _hd :: _tl, [] -> None
| _hd :: tl, Any :: tl' ->
match_prefix ~prefix ~stack:tl' ||| match_prefix ~prefix:tl ~stack
| hd :: tl, hd' :: tl' ->
if match_types hd hd' then match_prefix ~prefix:tl ~stack:tl' else None
let pop required stack =
match match_prefix ~prefix:required ~stack with
| None -> Error (`Type_mismatch "pop")
| Some stack -> Ok stack
let pop_ref = function
| (Something | Ref_type _) :: tl -> Ok tl
| Any :: _ as stack -> Ok stack
| _ -> Error (`Type_mismatch "pop_ref")
let drop stack =
match stack with
| [] -> Error (`Type_mismatch "drop")
| Any :: _ -> Ok [ Any ]
| _ :: tl -> Ok tl
let push t stack = ok @@ t @ stack
let pop_push (Bt_raw ((None | Some _), (pt, rt))) stack =
let pt, rt = (List.rev_map typ_of_pt pt, List.rev_map typ_of_val_type rt) in
let* stack = pop pt stack in
push rt stack
end
let rec typecheck_instr (env : env) (stack : stack) (instr : binary instr) :
stack Result.t =
match instr with
| Nop -> Ok stack
| Drop -> Stack.drop stack
| Return ->
let+ _stack =
Stack.pop (List.rev_map typ_of_val_type env.result_type) stack
in
[ any ]
| Unreachable -> Ok [ any ]
| I32_const _ -> Stack.push [ i32 ] stack
| I64_const _ -> Stack.push [ i64 ] stack
| F32_const _ -> Stack.push [ f32 ] stack
| F64_const _ -> Stack.push [ f64 ] stack
| I_unop (s, _op) ->
let t = itype s in
let* stack = Stack.pop [ t ] stack in
Stack.push [ t ] stack
| I_binop (s, _op) ->
let t = itype s in
let* stack = Stack.pop [ t; t ] stack in
Stack.push [ t ] stack
| F_unop (s, _op) ->
let t = ftype s in
let* stack = Stack.pop [ t ] stack in
Stack.push [ t ] stack
| F_binop (s, _op) ->
let t = ftype s in
let* stack = Stack.pop [ t; t ] stack in
Stack.push [ t ] stack
| I_testop (nn, _) ->
let* stack = Stack.pop [ itype nn ] stack in
Stack.push [ i32 ] stack
| I_relop (nn, _) ->
let t = itype nn in
let* stack = Stack.pop [ t; t ] stack in
Stack.push [ i32 ] stack
| F_relop (nn, _) ->
let t = ftype nn in
let* stack = Stack.pop [ t; t ] stack in
Stack.push [ i32 ] stack
| Local_get (Raw i) -> Stack.push [ Env.local_get i env ] stack
| Local_set (Raw i) ->
let t = Env.local_get i env in
Stack.pop [ t ] stack
| Local_tee (Raw i) ->
let t = Env.local_get i env in
let* stack = Stack.pop [ t ] stack in
Stack.push [ t ] stack
| Global_get (Raw i) ->
Stack.push [ typ_of_val_type @@ Env.global_get i env ] stack
| Global_set (Raw i) ->
let t = Env.global_get i env in
Stack.pop [ typ_of_val_type t ] stack
| If_else (_id, block_type, e1, e2) ->
let* stack = Stack.pop [ i32 ] stack in
let* stack_e1 = typecheck_expr env e1 ~is_loop:false block_type ~stack in
let+ _stack_e2 = typecheck_expr env e2 ~is_loop:false block_type ~stack in
stack_e1
| I_load (nn, _) | I_load16 (nn, _, _) | I_load8 (nn, _, _) ->
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ itype nn ] stack
| I64_load32 _ ->
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ i64 ] stack
| I_store8 (nn, _) | I_store16 (nn, _) | I_store (nn, _) ->
Stack.pop [ itype nn; i32 ] stack
| I64_store32 _ -> Stack.pop [ i64; i32 ] stack
| F_load (nn, _) ->
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ ftype nn ] stack
| F_store (nn, _) -> Stack.pop [ ftype nn; i32 ] stack
| I_reinterpret_f (inn, fnn) ->
let* stack = Stack.pop [ ftype fnn ] stack in
Stack.push [ itype inn ] stack
| F_reinterpret_i (fnn, inn) ->
let* stack = Stack.pop [ itype inn ] stack in
Stack.push [ ftype fnn ] stack
| F32_demote_f64 ->
let* stack = Stack.pop [ f64 ] stack in
Stack.push [ f32 ] stack
| F64_promote_f32 ->
let* stack = Stack.pop [ f32 ] stack in
Stack.push [ f64 ] stack
| F_convert_i (fnn, inn, _) ->
let* stack = Stack.pop [ itype inn ] stack in
Stack.push [ ftype fnn ] stack
| I_trunc_f (inn, fnn, _) | I_trunc_sat_f (inn, fnn, _) ->
let* stack = Stack.pop [ ftype fnn ] stack in
Stack.push [ itype inn ] stack
| I32_wrap_i64 ->
let* stack = Stack.pop [ i64 ] stack in
Stack.push [ i32 ] stack
| I_extend8_s nn | I_extend16_s nn ->
let t = itype nn in
let* stack = Stack.pop [ t ] stack in
Stack.push [ t ] stack
| I64_extend32_s ->
let* stack = Stack.pop [ i64 ] stack in
Stack.push [ i64 ] stack
| I64_extend_i32 _ ->
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ i64 ] stack
| Memory_grow ->
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ i32 ] stack
| Memory_size -> Stack.push [ i32 ] stack
| Memory_copy | Memory_init _ | Memory_fill ->
Stack.pop [ i32; i32; i32 ] stack
| Block (_, bt, expr) -> typecheck_expr env expr ~is_loop:false bt ~stack
| Loop (_, bt, expr) -> typecheck_expr env expr ~is_loop:true bt ~stack
| Call_indirect (_, bt) ->
let* stack = Stack.pop [ i32 ] stack in
Stack.pop_push bt stack
| Call (Raw i) ->
let pt, rt = Env.func_get i env in
let* stack = Stack.pop (List.rev_map typ_of_pt pt) stack in
Stack.push (List.rev_map typ_of_val_type rt) stack
| Call_ref _t ->
let+ stack = Stack.pop_ref stack in
(* TODO:
let bt = Env.type_get t env in
Stack.pop_push (Some bt) stack
*)
stack
| Return_call (Raw i) ->
let pt, rt = Env.func_get i env in
if
not
(Stack.equal
(List.rev_map typ_of_val_type rt)
(List.rev_map typ_of_val_type env.result_type) )
then Error (`Type_mismatch "return_call")
else
let+ _stack = Stack.pop (List.rev_map typ_of_pt pt) stack in
[ any ]
| Return_call_indirect (_, Bt_raw ((None | Some _), (pt, rt))) ->
if
not
(Stack.equal
(List.rev_map typ_of_val_type rt)
(List.rev_map typ_of_val_type env.result_type) )
then Error (`Type_mismatch "return_call_indirect")
else
let* stack = Stack.pop [ i32 ] stack in
let+ _stack = Stack.pop (List.rev_map typ_of_pt pt) stack in
[ any ]
| Return_call_ref (Bt_raw ((None | Some _), (pt, rt))) ->
if
not
(Stack.equal
(List.rev_map typ_of_val_type rt)
(List.rev_map typ_of_val_type env.result_type) )
then Error (`Type_mismatch "return_call_ref")
else
let* stack = Stack.pop_ref stack in
let+ _stack = Stack.pop (List.rev_map typ_of_pt pt) stack in
[ any ]
| Data_drop _i -> Ok stack
| Table_init (Raw ti, Raw ei) ->
let table_typ = Env.table_type_get ti env in
let elem_typ = Env.elem_type_get ei env in
if not @@ Stack.match_ref_type (snd table_typ) (snd elem_typ) then
Error (`Type_mismatch "table_init")
else Stack.pop [ i32; i32; i32 ] stack
| Table_copy (Raw i, Raw i') ->
let typ = Env.table_type_get i env in
let typ' = Env.table_type_get i' env in
if typ <> typ' then Error (`Type_mismatch "table_copy")
else Stack.pop [ i32; i32; i32 ] stack
| Table_fill (Raw i) ->
let _null, t = Env.table_type_get i env in
Stack.pop [ i32; Ref_type t; i32 ] stack
| Table_grow (Raw i) ->
let _null, t = Env.table_type_get i env in
let* stack = Stack.pop [ i32; Ref_type t ] stack in
Stack.push [ i32 ] stack
| Table_size _ -> Stack.push [ i32 ] stack
| Ref_is_null ->
let* stack = Stack.pop_ref stack in
Stack.push [ i32 ] stack
| Ref_null rt -> Stack.push [ Ref_type rt ] stack
| Elem_drop _ -> Ok stack
| Select t ->
let* stack = Stack.pop [ i32 ] stack in
begin
match t with
| None -> begin
match stack with
| Ref_type _ :: _tl -> Error (`Type_mismatch "select implicit")
| Any :: _ -> Ok [ Something; Any ]
| hd :: Any :: _ -> ok @@ (hd :: [ Any ])
| hd :: hd' :: tl when Stack.match_types hd hd' -> ok @@ (hd :: tl)
| _ -> Error (`Type_mismatch "select")
end
| Some t ->
let t = List.map typ_of_val_type t in
let* stack = Stack.pop t stack in
let* stack = Stack.pop t stack in
Stack.push t stack
end
| Ref_func (Raw i) ->
if not @@ Hashtbl.mem env.refs i then Error `Undeclared_function_reference
else Stack.push [ Ref_type Func_ht ] stack
| Br (Raw i) ->
let* jt = Env.block_type_get i env in
let* _stack = Stack.pop jt stack in
Ok [ any ]
| Br_if (Raw i) ->
let* stack = Stack.pop [ i32 ] stack in
let* jt = Env.block_type_get i env in
let* stack = Stack.pop jt stack in
Stack.push jt stack
| Br_table (branches, Raw i) ->
let* stack = Stack.pop [ i32 ] stack in
let* default_jt = Env.block_type_get i env in
let* _stack = Stack.pop default_jt stack in
let* () =
array_iter
(fun (Raw i : binary indice) ->
let* jt = Env.block_type_get i env in
if not (List.length jt = List.length default_jt) then
Error (`Type_mismatch "br_table")
else
let* _stack = Stack.pop jt stack in
Ok () )
branches
in
Ok [ any ]
| Table_get (Raw i) ->
let _null, t = Env.table_type_get i env in
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ Ref_type t ] stack
| Table_set (Raw i) ->
let _null, t = Env.table_type_get i env in
Stack.pop [ Ref_type t; i32 ] stack
| Array_len ->
(* TODO: fixme, Something is not right *)
let* stack = Stack.pop [ Something ] stack in
Stack.push [ i32 ] stack
| Ref_i31 ->
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ i31 ] stack
| I31_get_s | I31_get_u ->
let* stack = Stack.pop [ i31 ] stack in
Stack.push [ i32 ] stack
| ( Array_new_data _ | Array_new _ | Array_new_default _ | Array_new_elem _
| Array_new_fixed _ | Array_get _ | Array_get_u _ | Array_set _
| Struct_get _ | Struct_get_s _ | Struct_set _ | Struct_new _
| Struct_new_default _ | Extern_externalize | Extern_internalize
| Ref_as_non_null | Ref_cast _ | Ref_test _ | Br_on_non_null _
| Br_on_null _ | Br_on_cast _ | Br_on_cast_fail _ | Ref_eq ) as i ->
Log.debug2 "TODO (typecheck instr) %a" pp_instr i;
assert false
and typecheck_expr env expr ~is_loop (block_type : binary block_type option)
~stack:previous_stack : stack Result.t =
let pt, rt =
Option.fold ~none:([], [])
~some:(fun (Bt_raw ((None | Some _), (pt, rt)) : binary block_type) ->
(List.rev_map typ_of_pt pt, List.rev_map typ_of_val_type rt) )
block_type
in
let jump_type = if is_loop then pt else rt in
let env = { env with blocks = jump_type :: env.blocks } in
let* stack = list_fold_left (typecheck_instr env) pt expr in
if not (Stack.equal rt stack) then Error (`Type_mismatch "typecheck_expr 1")
else
match Stack.match_prefix ~prefix:pt ~stack:previous_stack with
| None ->
Error
(`Type_mismatch
(Format.asprintf "expected a prefix of %a but stack has type %a"
Stack.pp pt Stack.pp previous_stack ) )
| Some stack_to_push -> Stack.push rt stack_to_push
let typecheck_function (modul : modul) func refs =
match func with
| Runtime.Imported _ -> Ok ()
| Local func ->
let (Bt_raw ((None | Some _), (params, result))) = func.type_f in
let env =
Env.make ~params ~funcs:modul.func ~locals:func.locals
~globals:modul.global ~result_type:result ~tables:modul.table
~elems:modul.elem ~refs
in
let* stack =
typecheck_expr env func.body ~is_loop:false
(Some (Bt_raw (None, ([], result))))
~stack:[]
in
let required = List.rev_map typ_of_val_type result in
if not @@ Stack.equal required stack then
Error (`Type_mismatch "typecheck_function")
else Ok ()
let typecheck_const_instr (modul : modul) refs stack = function
| I32_const _ -> Stack.push [ i32 ] stack
| I64_const _ -> Stack.push [ i64 ] stack
| F32_const _ -> Stack.push [ f32 ] stack
| F64_const _ -> Stack.push [ f64 ] stack
| Ref_null t -> Stack.push [ Ref_type t ] stack
| Ref_func (Raw i) ->
Hashtbl.add refs i ();
Stack.push [ Ref_type Func_ht ] stack
| Global_get (Raw i) ->
let value = Indexed.get_at_exn i modul.global.values in
let* _mut, typ =
match value with
| Local _ -> Error `Unknown_global
| Imported t -> Ok t.desc
in
Stack.push [ typ_of_val_type typ ] stack
| I_binop (t, _op) ->
let t = itype t in
let* stack = Stack.pop [ t; t ] stack in
Stack.push [ t ] stack
| Array_new t ->
let t = arraytype modul t in
let* stack = Stack.pop [ i32; t ] stack in
Stack.push [ Ref_type Array_ht ] stack
| Array_new_default _i -> assert false
| Ref_i31 ->
let* stack = Stack.pop [ i32 ] stack in
Stack.push [ i31 ] stack
| _ -> assert false
let typecheck_const_expr (modul : modul) refs =
list_fold_left (typecheck_const_instr modul refs) []
let typecheck_global (modul : modul) refs
(global : (global, binary global_type) Runtime.t Indexed.t) =
match Indexed.get global with
| Imported _ -> Ok ()
| Local { typ; init; _ } -> (
let* real_type = typecheck_const_expr modul refs init in
match real_type with
| [ real_type ] ->
let expected = typ_of_val_type @@ snd typ in
if expected <> real_type then Error (`Type_mismatch "typecheck global 1")
else Ok ()
| _whatever -> Error (`Type_mismatch "typecheck_global 2") )
let typecheck_elem modul refs (elem : elem Indexed.t) =
let elem = Indexed.get elem in
let _null, expected_type = elem.typ in
let* () =
list_iter
(fun init ->
let* real_type = typecheck_const_expr modul refs init in
match real_type with
| [ real_type ] ->
if Ref_type expected_type <> real_type then
Error (`Type_mismatch "typecheck_elem 1")
else Ok ()
| _whatever -> Error (`Type_mismatch "typecheck elem 2") )
elem.init
in
match elem.mode with
| Elem_passive | Elem_declarative -> Ok ()
| Elem_active (None, _e) -> assert false
| Elem_active (Some tbl_i, e) -> (
let _null, tbl_type = Env.table_type_get_from_module tbl_i modul in
if tbl_type <> expected_type then Error (`Type_mismatch "typecheck elem 3")
else
let* t = typecheck_const_expr modul refs e in
match t with
| [ Ref_type t ] ->
if t <> tbl_type then Error (`Type_mismatch "typecheck_elem 4")
else Ok ()
| [ _t ] -> Ok ()
| _whatever -> Error (`Type_mismatch "typecheck_elem 5") )
let typecheck_data modul refs (data : data Indexed.t) =
let data = Indexed.get data in
match data.mode with
| Data_passive -> Ok ()
| Data_active (_i, e) -> (
let* t = typecheck_const_expr modul refs e in
match t with
| [ _t ] -> Ok ()
| _whatever -> Error (`Type_mismatch "typecheck_data") )
let modul (modul : modul) =
Log.debug0 "typechecking ...@\n";
let refs = Hashtbl.create 512 in
let* () = list_iter (typecheck_global modul refs) modul.global.values in
let* () = list_iter (typecheck_elem modul refs) modul.elem.values in
let* () = list_iter (typecheck_data modul refs) modul.data.values in
List.iter
(fun (export : export) -> Hashtbl.add refs export.id ())
modul.exports.func;
Named.fold
(fun _index func acc ->
let* () = acc in
typecheck_function modul func refs )
modul.func (Ok ())