2 * Copyright (c) 2015, Facebook, Inc.
5 * This source code is licensed under the MIT license found in the
6 * LICENSE file in the "hack" directory of this source tree.
10 (* This module implements the typing.
12 * Given an Nast.program, it infers the type of all the local
13 * variables, and checks that all the types are correct (aka
23 module TFTerm
= Typing_func_terminality
24 module TUtils
= Typing_utils
25 module Reason
= Typing_reason
26 module Inst
= Decl_instantiate
27 module Type
= Typing_ops
28 module Env
= Typing_env
29 module LEnv
= Typing_lenv
30 module Async
= Typing_async
31 module SubType
= Typing_subtype
32 module Unify
= Typing_unify
33 module Union
= Typing_union
34 module TGen
= Typing_generic
35 module SN
= Naming_special_names
36 module TI
= Typing_instantiability
37 module TVis
= Typing_visibility
38 module TNBody
= Typing_naming_body
39 module TS
= Typing_structure
41 module Phase
= Typing_phase
42 module Subst
= Decl_subst
43 module ExprDepTy
= Typing_dependent_type.ExprDepTy
44 module TCO
= TypecheckerOptions
45 module EnvFromDef
= Typing_env_from_def.EnvFromDef
(Nast.Annotations
)
46 module TySet
= Typing_set
47 module C
= Typing_continuations
49 module Try
= Typing_try
50 module TR
= Typing_reactivity
51 module FL
= FeatureLogging
52 module U
= Typing_union
54 (* Maps a Nast to a Tast where every type is Tany.
55 Used to produce a Tast for unsafe code without inferring types for it. *)
56 module NastTanyMapper
=
57 Aast_mapper.MapAnnotatedAST
(Nast.Annotations
)(Tast.Annotations
)
61 map_env_annotation
= (fun () -> Tast.empty_saved_env tcopt
);
62 map_expr_annotation
= (fun p
-> p
, (Reason.Rnone
, Tany
));
65 (*****************************************************************************)
67 (*****************************************************************************)
69 (* A guess as to the last position we were typechecking, for use in debugging,
70 * such as figuring out what a runaway hh_server thread is doing. Updated
71 * only best-effort -- it's an approximation to point debugging in the right
72 * direction, nothing more. *)
73 let debug_last_pos = ref Pos.none
74 let debug_print_last_pos _
= print_endline
(Pos.string (Pos.to_absolute
77 (****************************************************************************)
79 (****************************************************************************)
81 let expr_hook = ref None
83 let with_expr_hook hook f
= with_context
84 ~enter
: (fun () -> expr_hook := Some hook
)
85 ~exit
: (fun () -> expr_hook := None
)
88 (*****************************************************************************)
90 (*****************************************************************************)
92 let suggest env p ty
=
93 let ty = Typing_expand.fully_expand env
ty in
94 (match Typing_print.suggest ty with
95 | "..." -> Errors.expecting_type_hint p
96 | ty -> Errors.expecting_type_hint_suggest p
ty
99 let err_witness env p
= Reason.Rwitness p
, Typing_utils.terr env
101 (* When typing an expression, we optionally pass in the type
102 * that we *expect* the expression to have.
105 Pos.t
* Reason.ureason
* locl
ty
107 let expr_error env p r
=
108 let ty = (r
, Typing_utils.terr env
) in
109 env
, T.make_typed_expr p
ty T.Any
, ty
111 let expr_any env p r
=
112 let ty = (r
, Typing_utils.tany env
) in
113 env
, T.make_typed_expr p
ty T.Any
, ty
115 let compare_field_kinds x y
=
117 | Nast.AFvalue
(p1
, _
), Nast.AFkvalue
((p2
, _
), _
)
118 | Nast.AFkvalue
((p2
, _
), _
), Nast.AFvalue
(p1
, _
) ->
119 Errors.field_kinds p1 p2
;
124 let check_consistent_fields x l
=
125 List.for_all l
(compare_field_kinds x
)
127 let unbound_name env
(pos
, name
) =
128 match Env.get_mode env
with
129 | FileInfo.Mstrict
| FileInfo.Mexperimental
->
130 (Errors.unbound_name_typing pos name
;
131 expr_error env pos
(Reason.Rwitness pos
))
133 | FileInfo.Mdecl
| FileInfo.Mpartial
| FileInfo.Mphp
->
134 expr_any env pos
(Reason.Rwitness pos
)
136 (* Is this type Traversable<vty> or Container<vty> for some vty? *)
137 let get_value_collection_inst ty =
139 | (_
, Tclass
((_
, c
), [vty
])) when
140 c
= SN.Collections.cTraversable
||
141 c
= SN.Collections.cContainer
->
143 (* If we're expecting a mixed or a nonnull then we can just assume
144 * that the element type is mixed *)
145 | (_
, (Tmixed
| Tnonnull
)) ->
146 let mixed = (Reason.Rnone
, TUtils.desugar_mixed
Reason.Rnone
) in
153 (* Is this type KeyedTraversable<kty,vty>
154 * or KeyedContainer<kty,vty>
155 * or Indexish<kty,vty>
158 let get_key_value_collection_inst ty =
160 | (_
, Tclass
((_
, c
), [kty
; vty
])) when
161 c
= SN.Collections.cKeyedTraversable
||
162 c
= SN.Collections.cKeyedContainer
||
163 c
= SN.Collections.cIndexish
->
165 (* If we're expecting a mixed or a nonnull then we can just assume
166 * that the value and key types are mixed *)
167 | (_
, (Tmixed
| Tnonnull
)) ->
168 let mixed = (Reason.Rnone
, Tmixed
) in
175 (* Is this type varray<vty> or a supertype for some vty? *)
176 let get_varray_inst ty =
178 (* It's varray<vty> *)
179 | (_
, Tarraykind
(AKvarray vty
)) -> Some vty
180 | _
-> get_value_collection_inst ty
182 (* Is this type one of the value collection types with element type vty? *)
183 let get_vc_inst vc_kind
ty =
185 | (_
, Tclass
((_
, c
), [vty
]))
186 when c
= vc_kind_to_name vc_kind
-> Some vty
187 | _
-> get_value_collection_inst ty
189 (* Is this type array<vty> or a supertype for some vty? *)
190 let get_akvec_inst ty =
192 | (_
, Tarraykind
(AKvec vty
)) -> Some vty
193 | _
-> get_value_collection_inst ty
195 (* Is this type array<kty,vty> or a supertype for some kty and vty? *)
196 let get_akmap_inst ty =
198 | (_
, Tarraykind
(AKmap
(kty
, vty
))) -> Some
(kty
, vty
)
199 | _
-> get_key_value_collection_inst ty
201 (* Is this type one of the three key-value collection types
202 * e.g. dict<kty,vty> or a supertype for some kty and vty? *)
203 let get_kvc_inst kvc_kind
ty =
205 | (_
, Tclass
((_
, c
), [kty
; vty
]))
206 when c
= kvc_kind_to_name kvc_kind
-> Some
(kty
, vty
)
207 | _
-> get_key_value_collection_inst ty
209 (* Is this type darray<kty, vty> or a supertype for some kty and vty? *)
210 let get_darray_inst ty =
212 (* It's darray<kty, vty> *)
213 | (_
, Tarraykind
(AKdarray
(kty
, vty
))) -> Some
(kty
, vty
)
214 | _
-> get_key_value_collection_inst ty
217 (* Try running function on each concrete supertype in turn. Return all
220 let try_over_concrete_supertypes env
ty f
=
221 let env, tyl
= TUtils.get_concrete_supertypes
env ty in
222 (* If there is just a single result then don't swallow errors *)
227 let rec iter_over_types env resl tyl
=
232 (fun () -> iter_over_types env (f
env ty::resl
) tyl
)
233 (fun _
-> iter_over_types env resl tyl
) in
234 iter_over_types env [] tyl
236 (*****************************************************************************)
237 (* Handling function/method arguments *)
238 (*****************************************************************************)
239 let param_has_attribute param attr
=
240 List.exists param
.param_user_attributes
241 (fun { ua_name
; _
} -> attr
= snd ua_name
)
243 let has_accept_disposable_attribute param
=
244 param_has_attribute param
SN.UserAttributes.uaAcceptDisposable
246 let get_param_mutability param
=
247 if param_has_attribute param
SN.UserAttributes.uaMutable
248 then Some Param_mutable
249 else if param_has_attribute param
SN.UserAttributes.uaMaybeMutable
250 then Some Param_maybe_mutable
253 (* Check whether this is a function type that (a) either returns a disposable
254 * or (b) has the <<__ReturnDisposable>> attribute
256 let is_return_disposable_fun_type env ty =
257 match Env.expand_type
env ty with
258 | _env
, (_
, Tfun ft
) ->
259 ft
.ft_return_disposable
|| Option.is_some
(Typing_disposable.is_disposable_type
env ft
.ft_ret
)
262 let enforce_param_not_disposable env param
ty =
263 if has_accept_disposable_attribute param
then ()
265 let p = param
.param_pos
in
266 match Typing_disposable.is_disposable_type
env ty with
268 Errors.invalid_disposable_hint
p (strip_ns class_name
)
272 let param_has_at_most_rx_as_func p =
273 let module UA
= SN.UserAttributes
in
274 Attributes.mem2
UA.uaAtMostRxAsFunc
UA.uaOnlyRxIfRxFunc_do_not_use
p.param_user_attributes
276 let fun_reactivity env attrs params
=
277 let r = Decl.fun_reactivity env attrs
in
278 let module UA
= Naming_special_names.UserAttributes
in
281 (* if at least one of parameters has <<__AtMostRxAsFunc>> attribute -
282 treat function reactivity as generic that is determined from the reactivity
283 of arguments annotated with __AtMostRxAsFunc. Declared reactivity is used as a
284 upper boundary of the reactivity function can have. *)
285 if List.exists params ~f
:param_has_at_most_rx_as_func
290 (* if at least one of arguments have <<__OnlyRxIfImpl>> attribute -
291 treat function reactivity as conditional that is determined at the callsite *)
292 if List.exists params
293 ~f
:(fun { param_user_attributes
= p; _
} ->
294 Attributes.mem
UA.uaOnlyRxIfImpl
p)
299 (* This function is used to determine the type of an argument.
300 * When we want to type-check the body of a function, we need to
301 * introduce the type of the arguments of the function in the environment
302 * Let's take an example, we want to check the code of foo:
304 * function foo(int $x): int {
305 * // CALL TO make_param_type on (int $x)
306 * // Now we know that the type of $x is int
308 * return $x; // in the environment $x is an int, the code is correct
311 * When we localize, we want to resolve to "static" or "$this" depending on
312 * the context. Even though we are passing in CIstatic, resolve_with_class_id
313 * is smart enough to know what to do. Why do this? Consider the following
316 * abstract const type T;
318 * private this::T $val;
320 * final public function __construct(this::T $x) {
324 * public static function create(this::T $x): this {
325 * return new static($x);
329 * class D extends C { const type T = int; }
331 * In __construct() we want to be able to assign $x to $this->val. The type of
332 * $this->val will expand to '$this::T', so we need $x to also be '$this::T'.
333 * We can do this soundly because when we construct a new class such as,
334 * 'new D(0)' we can determine the late static bound type (D) and resolve
335 * 'this::T' to 'D::T' which is int.
337 * A similar line of reasoning is applied for the static method create.
339 let make_param_local_ty env param
=
341 { (Phase.env_with_self
env) with from_class
= Some CIstatic
; } in
343 match param
.param_hint
with
344 | None
when param
.param_expr
= None
->
345 let r = Reason.Rwitness param
.param_pos
in
346 env, (r, TUtils.tany
env)
348 (* if the type is missing, use an unbound type variable *)
349 let _r, ty = Env.fresh_type
() in
350 let r = Reason.Rwitness param
.param_pos
in
353 let ty = Decl_hint.hint
env.Env.decl_env x
in
355 Decl.condition_type_from_attributes
env.Env.decl_env param
.param_user_attributes
in
356 begin match condition_type with
357 | Some
condition_type ->
358 let env, ty = Phase.localize ~
ety_env env ty in
359 begin match TR.try_substitute_type_with_condition
env condition_type ty with
363 | _
when Attributes.mem2
SN.UserAttributes.uaOnlyRxIfRxFunc_do_not_use
364 SN.UserAttributes.uaAtMostRxAsFunc param
.param_user_attributes
->
365 let env, ty = Phase.localize ~
ety_env env ty in
366 (* expand type to track aliased function types *)
367 let env, expanded_ty
= Env.expand_type
env ty in
368 let adjusted_ty = make_function_type_rxvar expanded_ty
in
369 env, if phys_equal
adjusted_ty expanded_ty
then ty else adjusted_ty
371 Phase.localize ~
ety_env env ty
374 let ty = match ty with
375 | _
, t
when param
.param_is_variadic
->
376 (* when checking the body of a function with a variadic
377 * argument, "f(C ...$args)", $args is a varray<C> *)
378 let r = Reason.Rvar_param param
.param_pos
in
379 let arr_values = r, t
in
380 r, Tarraykind
(AKvarray
arr_values)
383 Typing_reactivity.disallow_atmost_rx_as_rxfunc_on_non_functions
env param
ty;
386 (* Given a localized parameter type and parameter information, infer
387 * a type for the parameter default expression (if present) and check that
388 * it is a subtype of the parameter type. Set the type of the parameter in
389 * the locals environment *)
390 let rec bind_param env (ty1
, param
) =
391 let env, param_te
, ty2
=
392 match param
.param_expr
with
394 (* XXX: We don't want to replace this Tany with Tdynamic, since it
395 represents the lack of a default parameter, which is valid
396 We really want a bottom type here rather than Tany, but this is fine
398 env, None
, (Reason.none
, Tany
)
400 let env, te
, ty = expr ~expected
:(param
.param_pos
, Reason.URparam
, ty1
) env e
in
401 Typing_sequencing.sequence_check_expr e
;
404 Typing_suggest.save_param
(param
.param_name
) env ty1 ty2
;
405 let env = Type.sub_type param
.param_pos
Reason.URhint
env ty2 ty1
in
407 T.param_annotation
= T.make_expr_annotation param
.param_pos ty1
;
408 T.param_hint
= param
.param_hint
;
409 T.param_is_reference
= param
.param_is_reference
;
410 T.param_is_variadic
= param
.param_is_variadic
;
411 T.param_pos
= param
.param_pos
;
412 T.param_name
= param
.param_name
;
413 T.param_expr
= param_te
;
414 T.param_callconv
= param
.param_callconv
;
415 T.param_user_attributes
= List.map param
.param_user_attributes
(user_attribute
env);
417 let mode = get_param_mode param
.param_is_reference param
.param_callconv
in
418 let id = Local_id.get param
.param_name
in
419 let env = Env.set_local
env id ty1
in
420 let env = Env.set_param
env id (ty1
, mode) in
421 let env = if has_accept_disposable_attribute param
422 then Env.set_using_var
env id else env in
424 match get_param_mutability param
with
425 | Some Param_mutable
->
426 Env.add_mutable_var
env id (param
.param_pos
, Typing_mutability_env.Borrowed
)
427 | Some Param_maybe_mutable
->
428 Env.add_mutable_var
env id (param
.param_pos
, Typing_mutability_env.MaybeMutable
)
432 (* In strict mode, we force you to give a type declaration on a parameter *)
433 (* But the type checker is nice: it makes a suggestion :-) *)
434 and check_param
env param
ty =
435 let env = Typing_attributes.check_def
env new_object
436 SN.AttributeKinds.parameter param
.param_user_attributes
in
437 match param
.param_hint
with
438 | None
-> suggest env param
.param_pos
ty
440 (* We do not permit hints to implement IDisposable or IAsyncDisposable *)
441 enforce_param_not_disposable env param
ty
443 and check_inout_return
env =
444 let params = Local_id.Map.elements
(Env.get_params
env) in
445 List.fold
params ~init
:env ~f
:begin fun env (id, ((r, ty), mode)) ->
448 (* Whenever the function exits normally, we require that each local
449 * corresponding to an inout parameter be compatible with the original
450 * type for the parameter (under subtyping rules). *)
451 let local_ty = Env.get_local
env id in
452 let env, ety
= Env.expand_type
env local_ty in
453 let pos = Reason.to_pos
(fst ety
) in
454 let param_ty = Reason.Rinout_param
(Reason.to_pos
r), ty in
455 Type.sub_type
pos Reason.URassign_inout
env ety
param_ty
459 and add_decl_errors
= function
461 | Some errors
-> Errors.merge_into_current errors
463 (*****************************************************************************)
464 (* Now we are actually checking stuff! *)
465 (*****************************************************************************)
466 and fun_def tcopt f
=
467 (* reset the expression dependent display ids for each function body *)
468 Reason.expr_display_id_map
:= IMap.empty
;
469 let pos = fst f
.f_name
in
470 let nb = TNBody.func_body tcopt f
in
471 let env = EnvFromDef.fun_env tcopt f
in
472 add_decl_errors
(Option.map
473 (Env.get_fun
env (snd f
.f_name
))
474 ~f
:(fun x
-> Option.value_exn x
.ft_decl_errors
)
476 let env = Env.set_env_function_pos
env pos in
477 let env = Typing_attributes.check_def
env new_object
SN.AttributeKinds.fn f
.f_user_attributes
in
478 let reactive = fun_reactivity env.Env.decl_env f
.f_user_attributes f
.f_params
in
479 let mut = TUtils.fun_mutable f
.f_user_attributes
in
480 let env = Env.set_env_reactive
env reactive in
481 let env = Env.set_fun_mutable
env mut in
482 NastCheck.fun_
env f
nb;
483 (* Fresh type environment is actually unnecessary, but I prefer to
484 * have a guarantee that we are using a clean typing environment. *)
485 let tfun_def = Env.fresh_tenv
env (
487 let env, constraints
=
488 Phase.localize_generic_parameters_with_bounds
env f
.f_tparams
489 ~
ety_env:(Phase.env_with_self
env) in
490 let env = add_constraints
pos env constraints
in
492 localize_where_constraints
493 ~
ety_env:(Phase.env_with_self
env) env f
.f_where_constraints
in
497 env, (Reason.Rwitness
pos, Typing_utils.tany
env)
499 let ty = TI.instantiable_hint
env ret
in
500 Phase.localize_with_self
env ty in
501 let return = Typing_return.make_info f
.f_fun_kind f
.f_user_attributes
env
502 ~is_explicit
:(Option.is_some f
.f_ret
) ~is_by_ref
:f
.f_ret_by_ref
ty in
503 TI.check_params_instantiable
env f
.f_params
;
504 TI.check_tparams_instantiable
env f
.f_tparams
;
506 List.map_env
env f
.f_params
make_param_local_ty in
507 if Env.is_strict
env then
508 List.iter2_exn ~f
:(check_param
env) f
.f_params param_tys
;
509 Typing_memoize.check_function
env f
;
510 let env, typed_params
= List.map_env
env (List.zip_exn param_tys f
.f_params
)
512 let env, t_variadic
= match f
.f_variadic
with
513 | FVvariadicArg vparam
->
514 TI.check_param_instantiable
env vparam
;
515 let env, ty = make_param_local_ty env vparam
in
516 if Env.is_strict
env then
517 check_param
env vparam
ty;
518 let env, t_vparam
= bind_param env (ty, vparam
) in
519 env, T.FVvariadicArg t_vparam
521 if Env.is_strict
env then
522 Errors.ellipsis_strict_mode ~require
:`Type_and_param_name
pos;
524 | FVnonVariadic
-> env, T.FVnonVariadic
in
525 let local_tpenv = env.Env.lenv
.Env.tpenv
in
526 let env, tb
= fun_
env return pos nb f
.f_fun_kind
in
527 let env = Env.check_todo
env in
528 begin match f
.f_ret
with
529 | None
when Env.is_strict
env ->
530 Typing_return.suggest_return
env pos return.Typing_env_return_info.return_type
531 | None
-> Typing_suggest.save_fun_or_method f
.f_name
533 Typing_return.async_suggest_return
(f
.f_fun_kind
) hint
pos
536 T.f_annotation
= Env.save
local_tpenv env;
540 T.f_tparams
= f
.f_tparams
;
541 T.f_where_constraints
= f
.f_where_constraints
;
542 T.f_variadic
= t_variadic
;
543 T.f_params
= typed_params
;
544 T.f_fun_kind
= f
.f_fun_kind
;
545 T.f_user_attributes
= List.map f
.f_user_attributes
(user_attribute
env);
546 T.f_body
= T.NamedBody
{
548 T.fnb_unsafe
= nb.fnb_unsafe
;
550 T.f_ret_by_ref
= f
.f_ret_by_ref
;
551 T.f_external
= f
.f_external
;
553 Typing_lambda_ambiguous.suggest_fun_def
env fundef
557 (*****************************************************************************)
558 (* function used to type closures, functions and methods *)
559 (*****************************************************************************)
561 and fun_ ?
(abstract
=false) env return pos named_body f_kind
=
562 Env.with_env
env begin fun env ->
563 debug_last_pos := pos;
564 let env = Env.set_return
env return in
565 let env = Env.set_fn_kind
env f_kind
in
566 let env, tb
= block
env named_body
.fnb_nast
in
567 Typing_sequencing.sequence_check_block named_body
.fnb_nast
;
568 let { Typing_env_return_info.return_type
= ret
; _
} = Env.get_return
env in
570 if not
@@ LEnv.has_next
env ||
572 named_body
.fnb_unsafe
||
575 else fun_implicit_return
env pos ret f_kind
in
576 debug_last_pos := Pos.none
;
580 and fun_implicit_return
env pos ret
= function
581 | Ast.FGenerator
| Ast.FAsyncGenerator
-> env
584 (* A function without a terminal block has an implicit return; the
586 let env = check_inout_return
env in
587 let rty = Reason.Rno_return
pos, Tprim
Nast.Tvoid
in
588 Typing_return.implicit_return
env pos ~expected
:ret ~actual
:rty
590 (* An async function without a terminal block has an implicit return;
591 * the Awaitable<void> type *)
592 let r = Reason.Rno_return_async
pos in
593 let rty = r, Tclass
((pos, SN.Classes.cAwaitable
), [r, Tprim
Nast.Tvoid
]) in
594 Typing_return.implicit_return
env pos ~expected
:ret ~actual
:rty
596 (* Perform provided typing function only if the Next continuation is present.
597 * If the Next continuation is absent, it means that we are typechecking
598 * unreachable code. *)
599 and if_next tyf
env node
=
600 match LEnv.get_cont_option
env C.Next
with
603 let env, tn
= tyf
env node
in
606 and block
env stl
= List.filter_map_env
env stl ~f
:(if_next stmt
)
608 (* Set a local; must not be already assigned if it is a using variable *)
609 and set_local ?
(is_using_clause
= false) env (pos,x
) ty =
610 if Env.is_using_var
env x
613 then Errors.duplicate_using_var
pos
614 else Errors.illegal_disposable
pos "assigned";
615 let env = Env.set_local
env x
ty in
616 if is_using_clause
then Env.set_using_var
env x
else env
618 (* Check an individual component in the expression `e` in the
619 * `using (e) { ... }` statement.
620 * This consists of either
621 * a simple assignment `$x = e`, in which `$x` is the using variable, or
622 * an arbitrary expression `e`, in which case a temporary is the using
623 * variable, inaccessible in the source.
624 * Return the typed expression and its type, and any variables that must
625 * be designated as "using variables" for avoiding escapes.
627 and check_using_expr has_await
env ((pos, content
) as using_clause
) =
629 (* Simple assignment to local of form `$lvar = e` *)
630 | Binop
(Ast.Eq None
, (lvar_pos
, Lvar lvar
), e
) ->
631 let env, te
, ty = expr ~is_using_clause
:true env e
in
632 let env = Typing_disposable.enforce_is_disposable_type
env has_await
(fst e
) ty in
633 let env = set_local ~is_using_clause
:true env lvar
ty in
634 (* We are assigning a new value to the local variable, so we need to
635 * generate a new expression id
637 let env = Env.set_local_expr_id
env (snd lvar
) (Ident.tmp
()) in
638 env, (T.make_typed_expr
pos ty (T.Binop
(Ast.Eq None
,
639 T.make_typed_expr lvar_pos
ty (T.Lvar lvar
), te
)), [snd lvar
])
641 (* Arbitrary expression. This will be assigned to a temporary *)
643 let env, typed_using_clause
, ty = expr ~is_using_clause
:true env using_clause
in
644 let env = Typing_disposable.enforce_is_disposable_type
env has_await
pos ty in
645 env, (typed_using_clause
, [])
647 (* Check the using clause e in
648 * `using (e) { ... }` statement (`has_await = false`) or
649 * `await using (e) { ... }` statement (`has_await = true`).
650 * The expression consists of a comma-separated list of expressions (Expr_list)
651 * or a single expression.
652 * Return the typed expression, and any variables that must
653 * be designated as "using variables" for avoiding escapes.
655 and check_using_clause
env has_await
((pos, content
) as using_clause
) =
657 | Expr_list using_clauses
->
658 let env, pairs
= List.map_env
env using_clauses
(check_using_expr has_await
) in
659 let typed_using_clauses, vars_list
= List.unzip pairs
in
660 let ty_ = Ttuple
(List.map
typed_using_clauses T.get_type
) in
661 let ty = (Reason.Rnone
, ty_) in
662 env, T.make_typed_expr
pos ty (T.Expr_list
typed_using_clauses),
663 List.concat vars_list
665 let env, (typed_using_clause
, vars
) = check_using_expr has_await
env using_clause
in
666 env, typed_using_clause
, vars
668 (* Require a new construct with disposable *)
669 and enforce_return_disposable _env e
=
673 | _
, Await
(_
, Call _
) -> ()
675 Errors.invalid_return_disposable
p
677 (* Wrappers around the function with the same name in Typing_lenv, which only
678 * performs the move/save and merge operation if we are in a try block or in a
679 * function with return type 'noreturn'.
680 * This enables significant perf improvement, because this is called at every
681 * function of method call, when most calls are outside of a try block. *)
682 and move_and_merge_next_in_catch
env =
683 if env.Env.in_try
|| (TFTerm.is_noreturn
env)
684 then LEnv.move_and_merge_next_in_cont
env C.Catch
685 else LEnv.drop_cont
env C.Next
687 and save_and_merge_next_in_catch
env =
688 if env.Env.in_try
|| (TFTerm.is_noreturn
env)
689 then LEnv.save_and_merge_next_in_cont
env C.Catch
692 and stmt
env = function
694 (* Do not run inference on the block, since unsafe is sometimes used to work
695 around inference performance problems. *)
696 let tcopt = Env.get_tcopt
env in
697 let tb = NastTanyMapper.map_block
(ntm_env tcopt) b
in
698 env, T.Unsafe_block
tb
700 let env = if env.Env.in_case
701 then LEnv.move_and_merge_next_in_cont
env C.Fallthrough
706 let env = move_and_merge_next_in_catch
env in
711 let env, te
, ty = expr ~is_expr_statement
:true env e
in
712 let env = if TFTerm.expression_exits
env e
713 then LEnv.move_and_merge_next_in_cont
env C.Exit
715 (* NB: this check does belong here and not in expr, even though it only
716 * applies to expressions -- we actually want to perform the check on
717 * statements that are expressions, e.g., "foo();" we want to check, but
718 * "return foo();" we do not even though the expression "foo()" is a
719 * subexpression of the statement "return foo();". *)
721 | Nast.Binop
(Ast.Eq _
, _
, _
) -> ()
722 | _
-> Async.enforce_not_awaitable
env (fst e
) ty);
725 let env, te
, _
= expr
env e
in
727 (* We stash away the locals environment because condition updates it
728 * locally for checking b1. For example, we might have condition
729 * $x === null, or $x instanceof C, which changes the type of $x in
731 let parent_lenv = env.Env.lenv
in
733 let env = condition
env true te
in
734 let env, tb1
= block
env b1
in
735 let lenv1 = env.Env.lenv
in
737 let env = { env with Env.lenv
= parent_lenv } in
738 let env = condition
env false te
in
739 let env, tb2
= block
env b2
in
740 let lenv2 = env.Env.lenv
in
742 let env = LEnv.union_lenvs
env parent_lenv lenv1 lenv2 in
743 (* TODO TAST: annotate with joined types *)
744 env, T.If
(te
, tb1
, tb2
)
745 | Return
(p, None
) ->
746 let env = check_inout_return
env in
747 let rty = Typing_return.wrap_awaitable
env p (Reason.Rwitness
p, Tprim Tvoid
) in
748 let { Typing_env_return_info.return_type
= expected_return
; _
} = Env.get_return
env in
749 let env = Typing_return.implicit_return
env p ~expected
:expected_return ~actual
:rty in
750 let env = LEnv.move_and_merge_next_in_cont
env C.Exit
in
751 env, T.Return
(p, None
)
752 | Return
(p, Some e
) ->
753 let env = check_inout_return
env in
755 let Typing_env_return_info.{
756 return_type
; return_disposable
; return_mutable
; return_explicit
; return_by_ref
;
757 return_void_to_rx
} = Env.get_return
env in
760 then Some
(pos, Reason.URreturn
,
761 Typing_return.strip_awaitable
(Env.get_fn_kind
env) env return_type
)
762 else Some
(pos, Reason.URreturn
, (Reason.Rwitness
p, Typing_utils.tany
env)) in
763 if return_disposable
then enforce_return_disposable
env e
;
764 let env, te
, rty = expr ~is_using_clause
:return_disposable ?
expected:expected env e
in
765 if Env.env_reactivity
env <> Nonreactive
767 Typing_mutability.check_function_return_value
768 ~function_returns_mutable
:return_mutable
769 ~function_returns_void_for_rx
: return_void_to_rx
775 then begin match snd e
with
776 | Array_get _
-> Errors.return_ref_in_array
p
779 let return_type = TR.strip_condition_type_in_return
env return_type in
780 let env, rty = Env.unbind
env rty in
781 let rty = Typing_return.wrap_awaitable
env p rty in
782 Typing_suggest.save_return
env return_type rty;
783 let env = Type.coerce_type
pos Reason.URreturn
env rty return_type in
784 let env = LEnv.move_and_merge_next_in_cont
env C.Exit
in
785 env, T.Return
(p, Some te
)
787 (* NOTE: leaks scope as currently implemented; this matches
788 the behavior in naming (cf. `do_stmt` in naming/naming.ml).
790 let env, (tb, te
) = LEnv.stash_and_do
env [C.Continue
; C.Break
; C.Do
]
792 let env = LEnv.save_and_merge_next_in_cont
env C.Do
in
793 let env, _
= block
env b
in
794 (* saving the locals in continue here even if there is no continue
795 * statement because they must be merged at the end of the loop, in
796 * case there is no iteration *)
797 let env = LEnv.save_and_merge_next_in_cont
env C.Continue
in
799 if env.Env.in_loop
then 1 else Typing_alias.get_depth st
in
800 let env, tb = Env.in_loop
env begin
801 iter_n_acc
alias_depth begin fun env ->
802 let env = LEnv.update_next_from_conts
env [C.Continue
; C.Next
] in
803 (* The following is necessary in case there is an assignment in the
805 let env, te
, _
= expr
env e
in
806 let env = condition
env true te
in
807 let env = LEnv.update_next_from_conts
env [C.Do
; C.Next
] in
808 let env, tb = block
env b
in
811 let env = LEnv.update_next_from_conts
env [C.Continue
; C.Next
] in
812 let env, te
, _
= expr
env e
in
813 let env = condition
env false te
in
814 let env = LEnv.update_next_from_conts
env [C.Break
; C.Next
] in
817 | While
(e
, b
) as st
->
818 let env, (te
, tb) = LEnv.stash_and_do
env [C.Continue
; C.Break
] (fun env ->
819 let env = LEnv.save_and_merge_next_in_cont
env C.Continue
in
821 if env.Env.in_loop
then 1 else Typing_alias.get_depth st
in
822 let env, tb = Env.in_loop
env begin
823 iter_n_acc
alias_depth begin fun env ->
824 let env = LEnv.update_next_from_conts
env [C.Continue
; C.Next
] in
825 (* The following is necessary in case there is an assignment in the
827 let env, te
, _
= expr
env e
in
828 let env = condition
env true te
in
829 (* TODO TAST: avoid repeated generation of block *)
830 let env, tb = block
env b
in
834 let env = LEnv.update_next_from_conts
env [C.Continue
; C.Next
] in
835 let env, te
, _
= expr
env e
in
836 let env = condition
env false te
in
837 let env = LEnv.update_next_from_conts
env [C.Break
; C.Next
] in
839 env, T.While
(te
, tb)
840 | Using
(has_await
, using_clause
, using_block
) ->
841 let env, typed_using_clause
, using_vars
= check_using_clause
env has_await using_clause
in
842 let env, typed_using_block
= block
env using_block
in
843 (* Remove any using variables from the environment, as they should not
844 * be in scope outside the block *)
845 let env = List.fold_left using_vars ~init
:env ~f
:Env.unset_local
in
846 env, T.Using
(has_await
, typed_using_clause
, typed_using_block
)
847 | For
(e1
, e2
, e3
, b
) as st
->
848 let env, (te1
, te2
, te3
, tb) = LEnv.stash_and_do
env [C.Continue
; C.Break
]
850 (* For loops leak their initalizer, but nothing that's defined in the
853 let (env, te1
, _
) = expr
env e1
in (* initializer *)
854 let env = LEnv.save_and_merge_next_in_cont
env C.Continue
in
856 if env.Env.in_loop
then 1 else Typing_alias.get_depth st
in
857 let env, (tb, te3
) = Env.in_loop
env begin
858 iter_n_acc
alias_depth begin fun env ->
859 (* The following is necessary in case there is an assignment in the
861 let env, te2
, _
= expr
env e2
in
862 let env = condition
env true te2
in
863 let env, tb = block
env b
in
864 let env = LEnv.update_next_from_conts
env [C.Continue
; C.Next
] in
865 let (env, te3
, _
) = expr
env e3
in
869 let env = LEnv.update_next_from_conts
env [C.Continue
; C.Next
] in
870 let (env, te2
, _
) = expr
env e2
in
871 let env = condition
env false te2
in
872 let env = LEnv.update_next_from_conts
env [C.Break
; C.Next
] in
873 env, (te1
, te2
, te3
, tb)) in
874 env, T.For
(te1
, te2
, te3
, tb)
875 | Switch
((pos, _
) as e
, cl
) ->
876 let env, te
, ty = expr
env e
in
877 Async.enforce_not_awaitable
env (fst e
) ty;
878 (* NB: A 'continue' inside a 'switch' block is equivalent to a 'break'.
880 * http://php.net/manual/en/control-structures.continue.php *)
881 let env, (te
, tcl
) = LEnv.stash_and_do
env [C.Continue
; C.Break
]
883 let parent_locals = LEnv.get_all_locals
env in
884 let case_list env = case_list parent_locals ty env pos cl
in
885 let env, tcl
= Env.in_case
env case_list in
886 let env = LEnv.update_next_from_conts
env
887 [C.Continue
; C.Break
; C.Next
] in
889 env, T.Switch
(te
, tcl
)
890 | Foreach
(e1
, e2
, b
) as st
->
891 let check_dynamic env ty ~f
=
892 if TUtils.is_dynamic
env ty then
895 (* It's safe to do foreach over a disposable, as no leaking is possible *)
896 let env, te1
, ty1
= expr ~accept_using_var
:true env e1
in
897 TR.check_foreach_collection
env (fst e1
) ty1
;
898 let env, (te1
, te2
, tb) = LEnv.stash_and_do
env [C.Continue
; C.Break
]
900 let env = LEnv.save_and_merge_next_in_cont
env C.Continue
in
901 let env, ty2
= as_expr
env (fst e1
) e2
in
903 check_dynamic env ty1 ~f
:begin fun () ->
904 Type.sub_type
(fst e1
) Reason.URforeach
env ty1 ty2
907 if env.Env.in_loop
then 1 else Typing_alias.get_depth st
in
908 let env, (te2
, tb) = Env.in_loop
env begin
909 iter_n_acc
alias_depth begin fun env ->
910 let env = LEnv.update_next_from_conts
env [C.Continue
; C.Next
] in
911 let env, te2
= bind_as_expr
env ty1 ty2 e2
in
912 let env, tb = block
env b
in
916 let env = LEnv.update_next_from_conts
env
917 [C.Continue
; C.Break
; C.Next
] in
918 env, (te1
, te2
, tb)) in
919 env, T.Foreach
(te1
, te2
, tb)
920 | Try
(tb, cl
, fb
) ->
921 let env, ttb
, tcl
, tfb
= try_catch
env tb cl fb
in
922 env, T.Try
(ttb
, tcl
, tfb
)
924 Typing_reactivity.disallow_static_or_global_in_reactive_context
env el
926 let env = List.fold_left el ~f
:begin fun env e
->
928 | _
, Binop
(Ast.Eq _
, (_
, Lvar
(p, x
)), _
) ->
929 Env.add_todo
env (TGen.no_generic
p x
)
932 let env, tel
, _
= exprs
env el
in
933 env, T.Static_var tel
935 Typing_reactivity.disallow_static_or_global_in_reactive_context
env el
937 let env = List.fold_left el ~f
:begin fun env e
->
939 | _
, Binop
(Ast.Eq _
, (_
, Lvar
(p, x
)), _
) ->
940 Env.add_todo
env (TGen.no_generic
p x
)
943 let env, tel
, _
= exprs
env el
in
944 env, T.Global_var tel
945 | Throw
(is_terminal
, e
) ->
947 let env, te
, ty = expr
env e
in
948 let env = exception_ty
p env ty in
949 let env = move_and_merge_next_in_catch
env in
950 env, T.Throw
(is_terminal
, te
)
952 let env = LEnv.move_and_merge_next_in_cont
env C.Continue
in
955 let env = LEnv.move_and_merge_next_in_cont
env C.Break
in
957 | Let
((p, x
) as id, h
, rhs
) ->
958 let env, hint_ty
, expected = match h
with
961 { (Phase.env_with_self
env) with from_class
= Some CIstatic
; } in
962 let hint_ty = Decl_hint.hint
env.Env.decl_env
(p, h
) in
963 let env, hint_ty = Phase.localize ~
ety_env env hint_ty in
964 env, Some
hint_ty, Some
(p, Reason.URhint
, hint_ty)
965 | None
-> env, None
, None
967 let env, t_rhs
, rhs_ty
= expr
env rhs
in
968 let env, _
= match hint_ty with
970 let env = check_expected_ty
"Let" env rhs_ty
expected in
971 set_valid_rvalue
p env x
ty
972 | None
-> set_valid_rvalue
p env x rhs_ty
974 (* Transfer expression ID with RHS to let varible if RHS is another variable *)
975 let env = match rhs
with
976 | _
, ImmutableVar
(_
, x_rhs
) | _
, Lvar
(_
, x_rhs
) ->
977 let eid_rhs = Env.get_local_expr_id
env x_rhs
in
980 ~f
:(Env.set_local_expr_id
env x
)
983 env, T.Let
(id, h
, t_rhs
)
985 and finally_cont fb
env ctx
=
986 let env = LEnv.replace_cont
env C.Next
(Some ctx
) in
987 let env, _tfb
= block
env fb
in
988 env, LEnv.get_all_locals
env
993 let env = LEnv.update_next_from_conts
env [C.Next
; C.Finally
] in
996 let parent_locals = LEnv.get_all_locals
env in
997 (* First typecheck the finally block against all continuations merged
999 * During this phase, record errors found in the finally block, but discard
1000 * the resulting environment. *)
1001 let env'
= LEnv.update_next_from_conts
env C.all
in
1002 let _, tfb
= block
env' fb
in
1003 (* Second, typecheck the finally block once against each continuation. This
1004 * helps be more clever about what each continuation will be after the
1006 * We don't want to record errors during this phase, because certain types
1007 * of errors will fire wrongly. For example, if $x is nullable in some
1008 * continuations but not in others, then we must use `?->` on $x, but an
1009 * error will fire when typechecking the finally block againts continuations
1010 * where $x is non-null. *)
1011 let finally_cont env _key
= finally_cont fb
env in
1012 let env, locals_map
= Errors.ignore_
(fun () ->
1013 CMap.map_env
finally_cont env parent_locals) in
1014 let env, locals
= Try.finally_merge
env locals_map
in
1015 (Env.env_with_locals
env locals
), tfb
1017 and try_catch
env tb cl fb
=
1018 let parent_locals = LEnv.get_all_locals
env in
1019 let env = LEnv.drop_conts
env
1020 [C.Break
; C.Continue
; C.Exit
; C.Catch
; C.Finally
] in
1021 let env, (ttb
, tcb
) = Env.in_try
env (fun env ->
1022 let env, ttb
= block
env tb in
1023 let env = LEnv.move_and_merge_next_in_cont
env C.Finally
in
1024 (* If there is no catch continuation, this means the try block has not
1025 * thrown, so the catch blocks are not reached, so we don't typecheck them. *)
1026 let env, tcb
= match LEnv.get_cont_option
env C.Catch
with
1029 let env, lenvtcblist
= List.map_env
env ~f
:(catch catchctx
) cl
in
1030 let lenvl, tcb
= List.unzip lenvtcblist
in
1031 let env = LEnv.union_lenv_list
env env.Env.lenv
lenvl in
1032 let env = LEnv.move_and_merge_next_in_cont
env C.Finally
in
1035 let env, tfb
= finally
env fb
in
1036 let env = LEnv.drop_cont
env C.Finally
in
1037 let env = LEnv.restore_and_merge_conts_from
1038 env parent_locals [C.Break
; C.Continue
; C.Exit
; C.Catch
; C.Finally
] in
1041 and case_list parent_locals ty env switch_pos cl
=
1042 let initialize_next_cont env =
1043 let env = LEnv.restore_conts_from
env parent_locals [C.Next
] in
1044 let env = LEnv.update_next_from_conts
env [C.Next
; C.Fallthrough
] in
1045 LEnv.drop_cont
env C.Fallthrough
in
1047 let check_fallthrough env switch_pos case_pos block rest_of_list ~is_default
=
1048 if not
@@ List.is_empty block
then
1049 begin match rest_of_list
with
1052 begin match LEnv.get_cont_option
env C.Next
with
1054 if is_default
then Errors.default_fallthrough switch_pos
1055 else Errors.case_fallthrough switch_pos case_pos
1063 | Default b
:: rl
->
1064 let env = initialize_next_cont env in
1065 let env, tb = block
env b
in
1066 check_fallthrough env switch_pos
Pos.none b rl ~is_default
:true;
1067 let env, tcl
= case_list parent_locals ty env switch_pos rl
in
1068 env, T.Default
tb::tcl
1069 | (Case
((pos, _) as e
, b
)) :: rl
->
1070 let env = initialize_next_cont env in
1071 let env, te
, _ = expr
env e
in
1072 let env, tb = block
env b
in
1073 check_fallthrough env switch_pos
pos b rl ~is_default
:false;
1074 let env, tcl
= case_list parent_locals ty env switch_pos rl
in
1075 env, T.Case
(te
, tb)::tcl
1077 and catch catchctx
env (sid
, exn
, b
) =
1078 let env = LEnv.replace_cont
env C.Next
(Some catchctx
) in
1079 let cid = CI
(sid
, []) in
1080 let ety_p = (fst sid
) in
1081 let env, _, _ = instantiable_cid
ety_p env cid in
1082 let env, _te
, ety
= static_class_id ~check_constraints
:false ety_p env cid in
1083 let env = exception_ty
ety_p env ety
in
1084 let env = set_local
env exn ety
in
1085 let env, tb = block
env b
in
1086 env, (env.Env.lenv
, (sid
, exn
, tb))
1088 and as_expr
env pe
= function
1090 let env, ty = Env.fresh_unresolved_type
env in
1091 let tvector = Tclass
((pe
, SN.Collections.cTraversable
), [ty]) in
1092 env, (Reason.Rforeach pe
, tvector)
1094 let env, ty1
= Env.fresh_unresolved_type
env in
1095 let env, ty2
= Env.fresh_unresolved_type
env in
1096 let tmap = Tclass
((pe
, SN.Collections.cKeyedTraversable
), [ty1
; ty2
]) in
1097 env, (Reason.Rforeach pe
, tmap)
1099 let env, ty = Env.fresh_unresolved_type
env in
1100 let tvector = Tclass
((pe
, SN.Classes.cAsyncIterator
), [ty]) in
1101 env, (Reason.Rasyncforeach pe
, tvector)
1103 let env, ty1
= Env.fresh_unresolved_type
env in
1104 let env, ty2
= Env.fresh_unresolved_type
env in
1105 let tmap = Tclass
((pe
, SN.Classes.cAsyncKeyedIterator
), [ty1
; ty2
]) in
1106 env, (Reason.Rasyncforeach pe
, tmap)
1108 and bind_as_expr
env loop_ty
ty aexpr
=
1109 let env, ety
= Env.expand_type
env ty in
1112 | _, Tclass
((p, _), [ty2
]) ->
1113 (p, (Reason.Rnone
, TUtils.desugar_mixed
Reason.Rnone
), ty2
)
1114 | _, Tclass
((p, _), [ty1
; ty2
]) -> (p, ty1
, ty2
)
1115 | _ -> assert false in
1116 (* Set id as dynamic if the foreach loop was dynamic *)
1117 let env, eloop_ty
= Env.expand_type
env loop_ty
in
1118 let ty1, ty2
= if TUtils.is_dynamic
env eloop_ty
then
1119 (fst
ty1, Tdynamic
), (fst ty2
, Tdynamic
) else ty1, ty2
in
1120 let check_reassigned_mutable env te
=
1121 if Env.env_local_reactive
env
1122 then Typing_mutability.handle_assignment_mutability
env te None
1126 let env, te
, _ = assign
p env ev ty2
in
1127 let env = check_reassigned_mutable env te
in
1129 | Await_as_v
(p, ev
) ->
1130 let env, te
, _ = assign
p env ev ty2
in
1131 let env = check_reassigned_mutable env te
in
1132 env, T.Await_as_v
(p, te
)
1133 | As_kv
((p, ImmutableVar
((_, k
) as id)), ev
)
1134 | As_kv
((p, Lvar
((_, k
) as id)), ev
) ->
1135 let env, ty1'
= set_valid_rvalue
p env k
ty1 in
1136 let env, te
, _ = assign
p env ev ty2
in
1137 let tk = T.make_typed_expr
p ty1'
(T.Lvar
id) in
1138 let env = check_reassigned_mutable env tk in
1139 let env = check_reassigned_mutable env te
in
1140 env, T.As_kv
(tk, te
)
1141 | Await_as_kv
(p, (p1
, ImmutableVar
((_, k
) as id)), ev
)
1142 | Await_as_kv
(p, (p1
, Lvar
((_, k
) as id)), ev
) ->
1143 let env, ty1'
= set_valid_rvalue
p env k
ty1 in
1144 let env, te
, _ = assign
p env ev ty2
in
1145 let tk = T.make_typed_expr p1
ty1'
(T.Lvar
id) in
1146 let env = check_reassigned_mutable env tk in
1147 let env = check_reassigned_mutable env te
in
1148 env, T.Await_as_kv
(p, tk, te
)
1149 | _ -> (* TODO Probably impossible, should check that *)
1154 ?
(accept_using_var
= false)
1155 ?
(is_using_clause
= false)
1156 ?
(is_expr_statement
= false)
1157 ?
(allow_non_awaited_awaitable_in_rx
=false)
1161 begin match expected with
1163 | Some
(_, r, ty) ->
1164 Typing_log.log_types
1 (fst e
) env
1165 [Typing_log.Log_sub
("Typing.expr " ^
Typing_reason.string_of_ureason
r,
1166 [Typing_log.Log_type
("expected_ty", ty)])] end;
1167 raw_expr ~accept_using_var ~is_using_clause ~is_expr_statement
1168 ~allow_non_awaited_awaitable_in_rx
1169 ?is_func_arg ?forbid_uref ?
expected env e
1172 ?
(accept_using_var
= false)
1173 ?
(is_using_clause
= false)
1174 ?
(is_expr_statement
= false)
1175 ?
(allow_non_awaited_awaitable_in_rx
=false)
1177 ?lhs_of_null_coalesce
1180 ?valkind
:(valkind
=`other
)
1182 debug_last_pos := fst e
;
1184 expr_ ~accept_using_var ~is_using_clause ~is_expr_statement ?
expected
1185 ?lhs_of_null_coalesce ?is_func_arg ?forbid_uref
1187 let () = match !expr_hook with
1188 | Some f
-> f e
(Typing_expand.fully_expand
env ty)
1190 if Env.env_local_reactive
env
1191 && not allow_non_awaited_awaitable_in_rx
1192 && not
(TypecheckerOptions.unsafe_rx
(Env.get_options
env))
1193 then begin match ty with
1194 | _, Tclass
((_, cls
), _) when cls
= SN.Classes.cAwaitable
->
1195 Errors.non_awaited_awaitable_in_rx
(fst e
);
1201 let valkind = `lvalue
in
1202 expr_ ~
valkind env e
1204 and is_pseudo_function s
=
1205 s
= SN.PseudoFunctions.hh_show
||
1206 s
= SN.PseudoFunctions.hh_show_env
||
1207 s
= SN.PseudoFunctions.hh_log_level
||
1208 s
= SN.PseudoFunctions.hh_loop_forever
1210 and loop_forever
env =
1211 (* forever = up to 10 minutes, to avoid accidentally stuck processes *)
1213 (* Look up things in shared memory occasionally to have a chance to be
1215 match Env.get_class
env "FOR_TEST_ONLY" with
1216 | None
-> Unix.sleep
1;
1219 Utils.assert_false_log_backtrace
1220 (Some
"hh_loop_forever was looping for more than 10 minutes")
1222 (* $x ?? 0 is handled similarly to $x ?: 0, except that the latter will also
1223 * look for sketchy null checks in the condition. *)
1224 (* TODO TAST: type refinement should be made explicit in the typed AST *)
1225 and eif
env ~
expected ~coalesce
p c e1 e2
=
1226 let condition = condition ~lhs_of_null_coalesce
:coalesce
in
1227 let env, tc
, tyc
= raw_expr ~lhs_of_null_coalesce
:coalesce
env c
in
1228 let parent_lenv = env.Env.lenv
in
1230 let env = condition env true tc
in
1231 let env, te1
, ty1 = match e1
with
1233 let env, ty = TUtils.non_null
env tyc
in
1236 let env, te1
, ty1 = expr ?
expected
1237 ~allow_non_awaited_awaitable_in_rx
:true env e1
in
1240 let lenv1 = env.Env.lenv
in
1241 let env = { env with Env.lenv
= parent_lenv } in
1242 let env = condition env false tc
in
1243 let env, te2
, ty2
= expr ?
expected
1244 ~allow_non_awaited_awaitable_in_rx
:true env e2
in
1245 let lenv2 = env.Env.lenv
in
1246 let fake_members = LEnv.intersect_fake
lenv1 lenv2 in
1247 (* we restore the locals to their parent state so as not to leak the
1248 * effects of the `condition` calls above *)
1249 let env = { env with Env.lenv
=
1250 { parent_lenv with Env.fake_members = fake_members } } in
1251 (* This is a shortened form of what we do in Typing_lenv.union_lenvs. The
1252 * latter takes local environments as arguments, but our types here
1253 * aren't assigned to local variables in an environment *)
1254 (* TODO: Omit if expected type is present and checked in calls to expr *)
1255 let env, ty = Union.union
env ty1 ty2
in
1256 let te = if coalesce
then T.Binop
(Ast.QuestionQuestion
, tc
, te2
) else T.Eif
(tc
, te1
, te2
) in
1257 env, T.make_typed_expr
p ty te, ty
1259 and is_parameter
env x
= Local_id.Map.mem x
(Env.get_params
env)
1260 and check_escaping_var
env (pos, x
) =
1261 if Env.is_using_var
env x
1264 then Errors.escaping_this
pos
1266 if is_parameter
env x
1267 then Errors.escaping_disposable_parameter
pos
1268 else Errors.escaping_disposable
pos
1271 and check_escaping_mutable
env (pos, x
) =
1272 let mut_env = Env.get_env_mutability
env in
1273 if (x
= this
&& Env.function_is_mutable
env) || Local_id.Map.mem x
mut_env
1274 then Errors.escaping_mutable_object
pos
1276 and exprs ?
(accept_using_var
= false) ?
(allow_non_awaited_awaitable_in_rx
=false)
1277 ?is_func_arg ?
expected env el
=
1283 let env, te, ty = expr ~accept_using_var ~allow_non_awaited_awaitable_in_rx
1284 ?is_func_arg ?
expected env e
in
1285 let env, tel
, tyl
= exprs ~accept_using_var ~allow_non_awaited_awaitable_in_rx
1286 ?is_func_arg ?
expected env el
in
1287 env, te::tel
, ty::tyl
1289 and exprs_expected
(pos, ur
, expected_tyl
) env el
=
1290 match el
, expected_tyl
with
1293 | e
::el
, expected_ty
::expected_tyl
->
1294 let env, te, ty = expr ~
expected:(pos, ur
, expected_ty
) env e
in
1295 let env, tel
, tyl
= exprs_expected
(pos, ur
, expected_tyl
) env el
in
1296 env, te::tel
, ty::tyl
1302 ?
(accept_using_var
= false)
1303 ?
(is_using_clause
= false)
1304 ?
(is_expr_statement
= false)
1305 ?lhs_of_null_coalesce
1306 ?
(is_func_arg
=false)
1307 ?
(forbid_uref
=false)
1308 ~
(valkind: [> `lvalue
| `lvalue_subexpr
| `other
])
1310 let make_result env te ty =
1311 env, T.make_typed_expr
p ty te, ty in
1314 * Given a list of types, computes their supertype. If any of the types are
1315 * unknown (e.g., comes from PHP), the supertype will be Typing_utils.tany env.
1317 let compute_supertype ~
expected env tys
=
1318 let env, supertype
=
1320 | None
-> Env.fresh_unresolved_type
env
1321 | Some
(_, _, ty) -> env, ty in
1322 match supertype
with
1323 (* No need to check individual subtypes if expected type is mixed or any! *)
1324 | (_, (Tmixed
| Tany
)) -> env, supertype
1326 let subtype_value env ty =
1327 Type.sub_type
p Reason.URarray_value
env ty supertype
in
1328 let env = List.fold_left tys ~init
:env ~f
:subtype_value in
1329 if List.exists tys
(fun (_, ty) -> ty = Typing_utils.tany
env) then
1330 (* If one of the values comes from PHP land, we have to be conservative
1331 * and consider that we don't know what the type of the values are. *)
1332 env, (Reason.Rwitness
p, Typing_utils.tany
env)
1337 * Given a 'a list and a method to extract an expr and its ty from a 'a, this
1338 * function extracts a list of exprs from the list, and computes the supertype
1339 * of all of the expressions' tys.
1341 let compute_exprs_and_supertype ~
expected env l extract_expr_and_ty
=
1342 let env, exprs_and_tys
= List.map_env
env l
(extract_expr_and_ty ~
expected) in
1343 let exprs, tys
= List.unzip exprs_and_tys
in
1344 let env, supertype
= compute_supertype ~
expected env tys
in
1345 env, exprs, supertype
in
1347 let shape_and_tuple_arrays_enabled =
1349 TypecheckerOptions.experimental_feature_enabled
1350 (Env.get_options
env)
1351 TypecheckerOptions.experimental_disable_shape_and_tuple_arrays
in
1353 let subtype_arraykey ~class_name ~key_pos
env key_ty
=
1354 let ty_arraykey = Reason.Ridx_dict key_pos
, Tprim Tarraykey
in
1355 Type.sub_type
p (Reason.index_class class_name
) env key_ty
ty_arraykey in
1357 let forget_fake_members env p callexpr
=
1358 (* Some functions are well known to not change the types of members, e.g.
1360 * There are a lot of usages like
1361 * if (!is_null($x->a) && !is_null($x->a->b))
1362 * where the second is_null call invalidates the first condition.
1363 * This function is a bit best effort. Add stuff here when you want
1364 * To avoid adding too many undue HH_FIXMEs. *)
1366 | _, Id
(_, func
) when (
1367 func
= SN.StdlibFunctions.is_null
||
1368 func
= SN.PseudoFunctions.isset
) -> env
1369 | _ -> Env.forget_members
env p in
1372 ~is_using_clause ~
expected ~is_expr_statement
env p call_type e hl el uel ~in_suspend
=
1373 let env, te, result
=
1375 ~is_using_clause ~
expected ~is_expr_statement
p env call_type e hl el uel ~in_suspend
in
1376 let env = forget_fake_members env p e
in
1381 | Any
-> expr_error env p (Reason.Rwitness
p)
1383 (* TODO: use expected type to determine expected element type *)
1384 make_result env (T.Array
[]) (Reason.Rwitness
p, Tarraykind AKempty
)
1386 (* TODO: use expected type to determine expected element type *)
1387 when Typing_arrays.is_shape_like_array
env l
&&
1388 shape_and_tuple_arrays_enabled ->
1389 let env, (tafl
, fdm
) = List.fold_left_env
env l
1390 ~init
:([], ShapeMap.empty
)
1391 ~f
:begin fun env (tafl
,fdm
) x
->
1392 let env, taf
, (key
, value) = akshape_field
env x
in
1393 env, (taf
::tafl
, Nast.ShapeMap.add key
value fdm
)
1395 make_result env (T.Array
(List.rev tafl
))
1396 (Reason.Rwitness
p, Tarraykind
(AKshape fdm
))
1398 | Array
(x
:: rl
as l
) ->
1399 (* True if all fields are values, or all fields are key => value *)
1400 let fields_consistent = check_consistent_fields x rl
in
1401 let is_vec = match x
with
1402 | Nast.AFvalue
_ -> true
1403 | Nast.AFkvalue
_ -> false in
1404 if fields_consistent && is_vec then
1405 (* Use expected type to determine expected element type *)
1406 let env, elem_expected
=
1407 match expand_expected
env expected with
1408 | env, Some
(pos, ur
, ety
) ->
1409 begin match get_akvec_inst ety
with
1410 | Some vty
-> env, Some
(pos, ur
, vty
)
1415 let env, tel
, arraykind
=
1416 if shape_and_tuple_arrays_enabled then
1417 let env, tel
, fields
=
1418 List.foldi l ~f
:begin fun index
(env, tel
, acc
) e
->
1419 let env, te, ty = aktuple_field
env e
in
1420 env, te::tel
, IMap.add index
ty acc
1421 end ~init
:(env, [], IMap.empty
) in
1422 env, tel
, AKtuple fields
1424 let env, tel
, value_ty
=
1425 compute_exprs_and_supertype ~
expected:elem_expected
env l array_field_value
in
1426 env, tel
, AKvec value_ty
in
1428 (T.Array
(List.map tel
(fun e
-> T.AFvalue e
)))
1429 (Reason.Rwitness
p, Tarraykind arraykind
)
1432 (* TODO TAST: produce a typed expression here *)
1435 (* Use expected type to determine expected element type *)
1436 let env, vexpected
=
1437 match expand_expected
env expected with
1438 | env, Some
(pos, ur
, ety
) ->
1439 begin match get_akvec_inst ety
with
1440 | Some vty
-> env, Some
(pos, ur
, vty
)
1445 let env, _value_exprs
, value_ty
=
1446 compute_exprs_and_supertype ~
expected:vexpected
env l array_field_value
in
1447 make_result env T.Any
1448 (Reason.Rwitness
p, Tarraykind
(AKvec value_ty
))
1450 (* Use expected type to determine expected element type *)
1451 let env, kexpected
, vexpected
=
1452 match expand_expected
env expected with
1453 | env, Some
(pos, ur
, ety
) ->
1454 begin match get_akmap_inst ety
with
1455 | Some
(kty
, vty
) -> env, Some
(pos, ur
, kty
), Some
(pos, ur
, vty
)
1456 | None
-> env, None
, None
1460 let env, key_exprs
, key_ty
=
1461 compute_exprs_and_supertype ~
expected:kexpected
env l array_field_key
in
1462 let env, value_exprs
, value_ty
=
1463 compute_exprs_and_supertype ~
expected:vexpected
env l array_field_value
in
1465 (T.Array
(List.map
(List.zip_exn key_exprs value_exprs
)
1466 (fun (tek
, tev
) -> T.AFkvalue
(tek
, tev
))))
1467 (Reason.Rwitness
p, Tarraykind
(AKmap
(key_ty
, value_ty
)))
1470 (* Use expected type to determine expected key and value types *)
1471 let env, kexpected
, vexpected
=
1472 match expand_expected
env expected with
1473 | env, Some
(pos, ur
, ety
) ->
1474 begin match get_darray_inst ety
with
1475 | Some
(kty
, vty
) ->
1476 env, Some
(pos, ur
, kty
), Some
(pos, ur
, vty
)
1482 let keys, values
= List.unzip l
in
1484 let env, value_exprs
, value_ty
=
1485 compute_exprs_and_supertype ~
expected:vexpected
env values array_value
in
1486 let env, key_exprs
, key_ty
=
1487 compute_exprs_and_supertype ~
expected:kexpected
env keys array_value
in
1489 List.fold_left key_exprs ~init
:env ~f
:begin
1490 fun env ((key_pos
, key_ty
), _) ->
1491 subtype_arraykey ~class_name
:"darray" ~key_pos
env key_ty
1493 let field_exprs = List.zip_exn key_exprs value_exprs
in
1495 (T.Darray
field_exprs)
1496 (Reason.Rwitness
p, Tarraykind
(AKdarray
(key_ty
, value_ty
)))
1499 (* Use expected type to determine expected element type *)
1500 let env, elem_expected
=
1501 match expand_expected
env expected with
1502 | env, Some
(pos, ur
, ety
) ->
1503 begin match get_varray_inst ety
with
1505 env, Some
(pos, ur
, vty
)
1512 let env, value_exprs
, value_ty
=
1513 compute_exprs_and_supertype ~
expected:elem_expected
env values array_value
in
1515 (T.Varray value_exprs
)
1516 (Reason.Rwitness
p, Tarraykind
(AKvarray value_ty
))
1518 | ValCollection
(kind
, el
) ->
1519 (* Use expected type to determine expected element type *)
1520 let env, elem_expected
=
1521 match expand_expected
env expected with
1522 | env, Some
(pos, ur
, ety
) ->
1523 begin match get_vc_inst kind ety
with
1525 env, Some
(pos, ur
, vty
)
1530 let env, tel
, tyl
= exprs ?
expected:elem_expected
env el
in
1531 let env, tyl
= List.map_env
env tyl
Typing_env.unbind
in
1533 match elem_expected
with
1534 | Some
(_, _, ty) -> env, ty
1535 | None
-> Env.fresh_unresolved_type
env in
1536 let class_name = vc_kind_to_name kind
in
1537 let subtype_val env ((pos, _), ty) =
1538 let env = Type.sub_type
p Reason.URvector
env ty elem_ty
in
1539 begin match kind
with
1540 | `Set
| `ImmSet
| `Keyset
->
1541 subtype_arraykey ~
class_name ~key_pos
:pos env ty
1542 | `Vector
| `ImmVector
| `Vec
| `Pair
->
1546 List.fold_left
(List.zip_exn el tyl
) ~init
:env ~f
:subtype_val in
1547 let tvector = Tclass
((p, class_name), [elem_ty
]) in
1548 let ty = Reason.Rwitness
p, tvector in
1549 make_result env (T.ValCollection
(kind
, tel
)) ty
1550 | KeyValCollection
(kind
, l
) ->
1551 (* Use expected type to determine expected key and value types *)
1552 let env, kexpected
, vexpected
=
1553 match expand_expected
env expected with
1554 | env, Some
(pos, ur
, ety
) ->
1555 begin match get_kvc_inst kind ety
with
1556 | Some
(kty
, vty
) ->
1557 env, Some
(pos, ur
, kty
), Some
(pos, ur
, vty
)
1561 | _ -> env, None
, None
in
1562 let kl, vl
= List.unzip l
in
1563 let env, tkl
, kl = exprs ?
expected:kexpected
env kl in
1564 let env, tvl
, vl
= exprs ?
expected:vexpected
env vl
in
1565 let env, kl = List.map_env
env kl Typing_env.unbind
in
1567 match kexpected
with
1568 | Some
(_, _, k
) -> env, k
1569 | None
-> Env.fresh_unresolved_type
env in
1570 let env, vl
= List.map_env
env vl
Typing_env.unbind
in
1572 match vexpected
with
1573 | Some
(_, _, v
) -> env, v
1574 | None
-> Env.fresh_unresolved_type
env in
1575 let class_name = kvc_kind_to_name kind
in
1576 let subtype_key env (((key_pos
, _), _), ty) =
1577 let env = Type.sub_type
p Reason.URkey
env ty k
in
1578 subtype_arraykey ~
class_name ~key_pos
env ty in
1580 List.fold_left
(List.zip_exn tkl
kl) ~init
:env ~f
:subtype_key in
1581 let subtype_val env ty = Type.sub_type
p Reason.URvalue
env ty v
in
1583 List.fold_left vl ~init
:env ~f
:subtype_val in
1584 let ty = Tclass
((p, class_name), [k
; v
])
1586 make_result env (T.KeyValCollection
(kind
, List.zip_exn tkl tvl
))
1587 (Reason.Rwitness
p, ty)
1589 let env, te, ty = expr
env e
in
1590 (* Clone only works on objects; anything else fatals at runtime *)
1591 let tobj = (Reason.Rwitness
p, Tobject
) in
1592 let env = Type.sub_type
p Reason.URclone
env ty tobj in
1593 make_result env (T.Clone
te) ty
1594 | This
when Env.is_static
env ->
1595 Errors.this_in_static
p;
1596 expr_error env p (Reason.Rwitness
p)
1597 | This
when valkind = `lvalue
->
1598 Errors.this_lvalue
p;
1599 expr_error env p (Reason.Rwitness
p)
1601 let r, _ = Env.get_self
env in
1603 then Errors.this_var_outside_class
p;
1604 if env.Env.disallow_this
1605 then Errors.escaping_mutable_object
p;
1606 if not accept_using_var
1607 then check_escaping_var
env (p,this
);
1608 let (_, ty) = Env.get_local
env this
in
1609 let r = Reason.Rwitness
p in
1611 let ty = r, TUtils.this_of
ty in
1612 (* '$this' always refers to the late bound static type *)
1613 let env, new_ty
= ExprDepTy.make
env CIstatic
ty in
1614 make_result env T.This
(new_ty
)
1615 | Assert
(AE_assert e
) ->
1616 let env, te, _ = expr
env e
in
1617 let env = LEnv.save_and_merge_next_in_cont
env C.Exit
in
1618 let env = condition env true te in
1619 make_result env (T.Assert
(T.AE_assert
te))
1620 (Reason.Rwitness
p, Tprim Tvoid
)
1622 make_result env T.True
(Reason.Rwitness
p, Tprim Tbool
)
1624 make_result env T.False
(Reason.Rwitness
p, Tprim Tbool
)
1625 (* TODO TAST: consider checking that the integer is in range. Right now
1626 * it's possible for HHVM to fail on well-typed Hack code
1629 make_result env (T.Int s
) (Reason.Rwitness
p, Tprim Tint
)
1631 make_result env (T.Float s
) (Reason.Rwitness
p, Tprim Tfloat
)
1632 (* TODO TAST: consider introducing a "null" type, and defining ?t to
1636 make_result env T.Null
(Reason.Rnull
p, Tprim Tvoid
)
1638 make_result env (T.String s
) (Reason.Rwitness
p, Tprim Tstring
)
1640 let env, tel
= string2
env idl
in
1641 make_result env (T.String2 tel
) (Reason.Rwitness
p, Tprim Tstring
)
1642 | PrefixedString
(n
, e
) ->
1645 Errors.experimental_feature
p
1646 "String prefixes other than `re` are not yet supported.";
1647 expr_error env p (Reason.Rnone
)
1649 let env, te, ty = expr
env e
in
1651 let env = SubType.sub_string
p env ty in
1654 begin try make_result env (T.PrefixedString
(n
, te))
1655 (Typing_regex.type_pattern e
)
1657 | Pcre.Error
(Pcre.BadPattern
(s
, i
)) ->
1658 let s = s ^
" [" ^
(string_of_int i
) ^
"]" in
1659 Errors.bad_regex_pattern
p s;
1660 expr_error env p (Reason.Rregex
p)
1661 | Typing_regex.Empty_regex_pattern
->
1662 Errors.bad_regex_pattern
p "This pattern is empty";
1663 expr_error env p (Reason.Rregex
p)
1664 | Typing_regex.Missing_delimiter
->
1665 Errors.bad_regex_pattern
p "Missing delimiter(s)";
1666 expr_error env p (Reason.Rregex
p)
1667 | Typing_regex.Invalid_global_option
->
1668 Errors.bad_regex_pattern
p "Invalid global option(s)";
1669 expr_error env p (Reason.Rregex
p)
1672 Errors.re_prefixed_non_string
p "Strings with embedded expressions";
1673 expr_error env p (Reason.Rregex
p)
1675 Errors.re_prefixed_non_string
p "Non-strings";
1676 expr_error env p (Reason.Rregex
p))
1678 let env, fty
= fun_type_of_id
env x
[] in
1679 begin match fty
with
1680 | _, Tfun fty
-> check_deprecated
(fst x
) fty
;
1683 make_result env (T.Fun_id x
) fty
1684 | Id
((cst_pos
, cst_name
) as id) ->
1685 (match Env.get_gconst
env cst_name
with
1686 | None
when Env.is_strict
env ->
1687 Errors.unbound_global cst_pos
;
1688 let ty = (Reason.Rwitness cst_pos
, Typing_utils.terr
env) in
1689 let te = T.make_typed_expr cst_pos
ty (T.Id
id) in
1692 make_result env (T.Id
id) (Reason.Rwitness cst_pos
, Typing_utils.tany
env)
1694 if cst_name
= SN.Rx.is_enabled
1695 && Env.env_reactivity
env = Nonreactive
1696 && not
(TypecheckerOptions.unsafe_rx
(Env.get_options
env))
1697 then Errors.rx_enabled_in_non_rx_context cst_pos
;
1699 Phase.localize_with_self
env ty in
1700 make_result env (T.Id
id) ty
1702 | Method_id
(instance
, meth
) ->
1703 (* Method_id is used when creating a "method pointer" using the magic
1704 * inst_meth function.
1706 * Typing this is pretty simple, we just need to check that instance->meth
1707 * is public+not static and then return its type.
1709 let env, te, ty1 = expr
env instance
in
1710 let env, result
, vis
=
1711 obj_get_with_visibility ~is_method
:true ~nullsafe
:None ~
valkind:`other ~pos_params
:None
env
1712 ty1 (CIexpr instance
) meth
(fun x
-> x
) in
1713 let has_lost_info = Env.FakeMembers.is_invalid
env instance
(snd meth
) in
1716 let name = "the method "^snd meth
in
1717 let env, result
= Env.lost_info
name env result
in
1718 make_result env (T.Method_id
(te, meth
)) result
1722 | _, Tfun fty
-> check_deprecated
p fty
1725 | Some
(method_pos
, Vprivate
_) ->
1726 Errors.private_inst_meth method_pos
p
1727 | Some
(method_pos
, Vprotected
_) ->
1728 Errors.protected_inst_meth method_pos
p
1731 make_result env (T.Method_id
(te, meth
)) result
1733 | Method_caller
((pos, class_name) as pos_cname
, meth_name
) ->
1734 (* meth_caller('X', 'foo') desugars to:
1737 let class_ = Env.get_class
env class_name in
1739 | None
-> unbound_name env pos_cname
1741 (* Create a class type for the given object instantiated with unresolved
1742 * types for its type parameters.
1745 List.map_env
env class_.tc_tparams
TUtils.unresolved_tparam
in
1746 let params = List.map
class_.tc_tparams
begin fun (_, (p, n
), _, _) ->
1747 Reason.Rwitness
p, Tgeneric n
1749 let obj_type = Reason.Rwitness
p, Tapply
(pos_cname
, params) in
1751 (Phase.env_with_self
env) with
1752 substs
= Subst.make
class_.tc_tparams tvarl
;
1754 let env, local_obj_ty
= Phase.localize ~
ety_env env obj_type in
1756 obj_get ~is_method
:true ~nullsafe
:None
env local_obj_ty
1757 (CI
((pos, class_name), [])) meth_name
(fun x
-> x
) in
1759 | reason
, Tfun fty
->
1760 check_deprecated
p fty
;
1761 (* We are creating a fake closure:
1762 * function(Class $x, arg_types_of(Class::meth_name))
1763 : return_type_of(Class::meth_name)
1766 ety_env with substs
= Subst.make
class_.tc_tparams tvarl
1769 Phase.check_tparams_constraints ~use_pos
:p ~
ety_env env class_.tc_tparams
in
1770 let env, local_obj_ty
= Phase.localize ~
ety_env env obj_type in
1771 let local_obj_fp = TUtils.default_fun_param local_obj_ty
in
1772 let fty = { fty with
1773 ft_params
= local_obj_fp :: fty.ft_params
} in
1774 let fun_arity = match fty.ft_arity
with
1775 | Fstandard
(min
, max
) -> Fstandard
(min
+ 1, max
+ 1)
1776 | Fvariadic
(min
, x
) -> Fvariadic
(min
+ 1, x
)
1777 | Fellipsis
(min
, p) -> Fellipsis
(min
+ 1, p) in
1780 ft_deprecated
= None
;
1781 ft_abstract
= false;
1782 (* propagate 'is_coroutine' from the method being called*)
1783 ft_is_coroutine
= fty.ft_is_coroutine
;
1784 ft_arity
= fun_arity;
1785 ft_tparams
= fty.ft_tparams
;
1786 ft_where_constraints
= fty.ft_where_constraints
;
1787 ft_params
= fty.ft_params
;
1788 ft_ret
= fty.ft_ret
;
1789 ft_ret_by_ref
= fty.ft_ret_by_ref
;
1790 ft_reactive
= fty.ft_reactive
;
1791 ft_mutability
= fty.ft_mutability
;
1792 ft_returns_mutable
= fty.ft_returns_mutable
;
1793 ft_return_disposable
= fty.ft_return_disposable
;
1794 ft_decl_errors
= None
;
1795 ft_returns_void_to_rx
= fty.ft_returns_void_to_rx
;
1797 make_result env (T.Method_caller
(pos_cname
, meth_name
))
1798 (reason
, Tfun
caller)
1800 (* This can happen if the method lives in PHP *)
1801 make_result env (T.Method_caller
(pos_cname
, meth_name
))
1802 (Reason.Rwitness
pos, Typing_utils.tany
env)
1805 | Smethod_id
(c
, meth
) ->
1806 (* Smethod_id is used when creating a "method pointer" using the magic
1807 * class_meth function.
1809 * Typing this is pretty simple, we just need to check that c::meth is
1810 * public+static and then return its type.
1812 let class_ = Env.get_class
env (snd c
) in
1815 (* The class given as a static string was not found. *)
1818 let smethod = Env.get_static_member
true env class_ (snd meth
) in
1820 | None
-> (* The static method wasn't found. *)
1821 smember_not_found
p ~is_const
:false ~is_method
:true class_ (snd meth
);
1822 expr_error env p Reason.Rnone
1823 | Some
{ ce_type
= lazy ty; ce_visibility
; _ } ->
1824 let cid = CI
(c
, []) in
1825 let env, _te
, cid_ty
= static_class_id ~check_constraints
:true (fst c
) env cid in
1828 | (_, Tclass
(_, tyargs)) -> tyargs
1831 type_expansions
= [];
1832 substs
= Subst.make
class_.tc_tparams
tyargs;
1834 from_class
= Some
cid;
1835 validate_dty
= None
;
1840 let env, ft
= Phase.localize_ft ~use_pos
:p ~
ety_env env ft
in
1841 let ty = r, Tfun ft
in
1842 check_deprecated
p ft
;
1843 match ce_visibility
with
1845 make_result env (T.Smethod_id
(c
, meth
)) ty
1847 Errors.private_class_meth
(Reason.to_pos
r) p;
1850 Errors.protected_class_meth
(Reason.to_pos
r) p;
1854 Errors.internal_error
p "We have a method which isn't callable";
1859 let r = Reason.Rplaceholder
p in
1860 let ty = r, Tprim Tvoid
in
1861 make_result env (T.Lplaceholder
p) ty
1862 | Dollardollar
_ when valkind = `lvalue
->
1863 Errors.dollardollar_lvalue
p;
1864 expr_error env p (Reason.Rwitness
p)
1865 | Dollardollar
((_, x
) as id) ->
1866 let ty = Env.get_local
env x
in
1867 let env = save_and_merge_next_in_catch
env in
1868 make_result env (T.Dollardollar
id) ty
1869 | Lvar
((_, x
) as id) ->
1870 let local_id = Local_id.to_string x
in
1871 if SN.Superglobals.is_superglobal
local_id
1872 then Env.error_if_reactive_context
env @@ begin fun () ->
1873 Errors.superglobal_in_reactive_context
p local_id;
1875 if not accept_using_var
1876 then check_escaping_var
env id;
1877 let ty = Env.get_local
env x
in
1878 make_result env (T.Lvar
id) ty
1879 | ImmutableVar
((_, x
) as id) ->
1880 let ty = Env.get_local
env x
in
1881 make_result env (T.ImmutableVar
id) ty
1883 let env, te, _ty
= expr
env e
in
1884 (** Can't easily track any typing information for variable variable. *)
1885 make_result env (T.Dollar
te) (Reason.Rwitness
p, Typing_utils.tany
env)
1887 let env, expected = expand_expected
env expected in
1890 | Some
(pos, ur
, (_, Ttuple expected_tyl
)) ->
1891 exprs_expected
(pos, ur
, expected_tyl
) env el
1895 (* TODO TAST: figure out role of unbind here *)
1896 let env, tyl
= List.map_env
env tyl
Typing_env.unbind
in
1897 let env, tyl
= List.map_env
env tyl
TUtils.unresolved
in
1898 let ty = Reason.Rwitness
p, Ttuple tyl
in
1899 make_result env (T.List tel
) ty
1901 (* Use expected type to determine expected element types *)
1902 let env, expected1
, expected2
=
1903 match expand_expected
env expected with
1904 | env, Some
(pos, ur
, (_, Tclass
((_, k
), [ty1; ty2
]))) when k
= SN.Collections.cPair
->
1905 env, Some
(pos, ur
, ty1), Some
(pos, ur
, ty2
)
1906 | _ -> env, None
, None
in
1907 let env, te1
, ty1 = expr ?
expected:expected1
env e1
in
1908 let env, ty1 = Typing_env.unbind
env ty1 in
1909 let env, ty1 = TUtils.unresolved
env ty1 in
1910 let env, te2
, ty2
= expr ?
expected:expected2
env e2
in
1911 let env, ty2
= Typing_env.unbind
env ty2
in
1912 let env, ty2
= TUtils.unresolved
env ty2
in
1914 Reason.Rwitness
p, Tclass
((p, SN.Collections.cPair
), [ty1; ty2
]) in
1915 make_result env (T.Pair
(te1
, te2
)) ty
1917 (* TODO: use expected type to determine tuple component types *)
1918 let env, tel
, tyl
= exprs env el
in
1919 let ty = Reason.Rwitness
p, Ttuple tyl
in
1920 make_result env (T.Expr_list tel
) ty
1921 | Array_get
(e
, None
) ->
1922 let env, te, _ = update_array_type
p env e None
valkind in
1923 let env = save_and_merge_next_in_catch
env in
1924 (* NAST check reports an error if [] is used for reading in an
1926 let ty = (Reason.Rwitness
p, Typing_utils.terr
env) in
1927 make_result env (T.Array_get
(te, None
)) ty
1928 | Array_get
(e1
, Some e2
) ->
1930 update_array_type ?lhs_of_null_coalesce
p env e1
(Some e2
) valkind in
1931 let env, ty1 = TUtils.fold_unresolved
env ty1 in
1932 let env, te2
, ty2
= expr
env e2
in
1933 let env = save_and_merge_next_in_catch
env in
1934 let is_lvalue = phys_equal
valkind `lvalue
in
1936 array_get ?lhs_of_null_coalesce
is_lvalue p env ty1 e2 ty2
in
1937 make_result env (T.Array_get
(te1
, Some te2
)) ty
1938 | Call
(Cnormal
, (pos_id
, Id
((_, s) as id)), hl
, el
, [])
1939 when is_pseudo_function
s ->
1940 let env, tel
, tys
= exprs ~accept_using_var
:true env el
in
1941 if s = SN.PseudoFunctions.hh_show
1942 then List.iter tys
(Typing_log.hh_show
p env)
1944 if s = SN.PseudoFunctions.hh_show_env
1945 then Typing_log.hh_show_env
p env
1947 if s = SN.PseudoFunctions.hh_log_level
1949 | [(_, Int level_str
)] ->
1950 Typing_log.hh_log_level
(int_of_string level_str
)
1953 if s = SN.PseudoFunctions.hh_loop_forever
then loop_forever
env
1958 T.make_typed_expr pos_id
(Reason.Rnone
, TUtils.tany
env) (T.Id
id),
1961 [])) (Env.fresh_type
())
1962 | Call
(call_type
, e
, hl
, el
, uel
) ->
1963 let env = save_and_merge_next_in_catch
env in
1964 let env, te, ty = check_call ~is_using_clause ~
expected ~is_expr_statement
1965 env p call_type e hl el uel ~in_suspend
:false in
1966 Typing_mutability.enforce_mutable_call
env te;
1968 | Binop
(Ast.QuestionQuestion
, e1
, e2
) ->
1969 eif
env ~
expected ~coalesce
:true p e1 None e2
1970 (* For example, e1 += e2. This is typed and translated as if
1971 * written e1 = e1 + e2.
1972 * TODO TAST: is this right? e1 will get evaluated more than once
1974 | Binop
(Ast.Eq
(Some op
), e1
, e2
) ->
1975 begin match op
, snd e1
with
1976 | Ast.QuestionQuestion
, Class_get
_ ->
1977 Errors.experimental_feature
p
1978 "null coalesce assignment operator with static properties";
1979 expr_error env p (Reason.Rnone
)
1981 let e_fake = (p, Binop
(Ast.Eq None
, e1
, (p, Binop
(op
, e1
, e2
)))) in
1982 let env, te_fake
, ty = raw_expr
env e_fake in
1983 begin match snd te_fake
with
1984 | T.Binop
(_, te1
, (_, T.Binop
(_, _, te2
))) ->
1985 let te = T.Binop
(Ast.Eq
(Some op
), te1
, te2
) in
1986 make_result env te ty
1990 | Binop
(Ast.Eq None
, e1
, e2
) ->
1991 let forbid_uref = match e1
, e2
with
1992 | (_, Array_get
_), (_, Unop
(Ast.Uref
, _))
1993 | _, (_, Unop
(Ast.Uref
, (_, Array_get
_))) -> true
1996 | _, ImmutableVar
(p, x
) ->
1997 Errors.let_var_immutability_violation
p (Local_id.get_name x
)
2000 let env, te2
, ty2
= raw_expr ~
forbid_uref env e2
in
2001 let env, te1
, ty = assign
p env e1 ty2
in
2003 if Env.env_local_reactive
env then
2004 Typing_mutability.handle_assignment_mutability
env te1
(Some
(snd te2
))
2007 (* If we are assigning a local variable to another local variable then
2008 * the expression ID associated with e2 is transferred to e1
2011 | (_, Lvar
(_, x1
)), (_, ImmutableVar
(_, x2
))
2012 | (_, Lvar
(_, x1
)), (_, Lvar
(_, x2
)) ->
2013 let eid2 = Env.get_local_expr_id
env x2
in
2017 ~f
:(Env.set_local_expr_id
env x1
) in
2018 make_result env (T.Binop
(Ast.Eq None
, te1
, te2
)) ty
2020 make_result env (T.Binop
(Ast.Eq None
, te1
, te2
)) ty
2022 | Binop
((Ast.Ampamp
| Ast.Barbar
as bop
), e1
, e2
) ->
2023 let c = bop
= Ast.Ampamp
in
2024 let env, te1
, _ = expr
env e1
in
2025 let lenv = env.Env.lenv in
2026 let env = condition env c te1
in
2027 let env, te2
, _ = expr
env e2
in
2028 let env = { env with Env.lenv = lenv } in
2029 make_result env (T.Binop
(bop
, te1
, te2
))
2030 (Reason.Rlogic_ret
p, Tprim Tbool
)
2031 | Binop
(bop
, e1
, e2
) when Env.is_strict
env
2032 && (snd e1
= Nast.Null
|| snd e2
= Nast.Null
)
2033 && (bop
= Ast.Eqeqeq
|| bop
= Ast.Diff2
) ->
2034 let e, ne
= if snd e2
= Nast.Null
then e1
, e2
else e2
, e1
in
2035 let env, te, ty = raw_expr
env e in
2036 let tne = T.make_typed_expr
(fst ne
) ty T.Null
in
2037 let te1, te2
= if snd e2
= Nast.Null
then te, tne else tne, te in
2038 make_result env (T.Binop
(bop
, te1, te2
))
2039 (Reason.Rcomp
p, Tprim Tbool
)
2040 | Binop
(bop
, e1
, e2
) ->
2041 let env, te1, ty1 = raw_expr
env e1
in
2042 let env, te2
, ty2
= raw_expr
env e2
in
2043 let env = save_and_merge_next_in_catch
env in
2045 binop
p env bop
(fst e1
) te1 ty1 (fst e2
) te2 ty2
in
2047 | Pipe
(e0
, e1
, e2
) ->
2048 let env, te1, ty = expr
env e1
in
2049 (** id is the ID of the $$ that is implicitly declared by the pipe.
2050 * Set the local type for the $$ in the RHS. *)
2051 let env = set_local
env e0
ty in
2052 (* do not error on awaitable being returned from RHS *)
2054 expr
env ~allow_non_awaited_awaitable_in_rx
:true e2
in
2056 * Return ty2 since the type of the pipe expression is the type of the
2059 * Note: env does have the type of this Pipe's $$, but it doesn't
2060 * override the outer one since they have different ID's.
2063 * a() |> ( inner1($$) |> inner2($$) ) + $$
2065 * The rightmost $$ refers to the result of a()
2067 make_result env (T.Pipe
(e0
, te1, te2
)) ty2
2069 let env, te, ty = raw_expr
env e in
2070 let env = save_and_merge_next_in_catch
env in
2071 unop ~is_func_arg ~
forbid_uref p env uop
te ty
2072 | Eif
(c, e1
, e2
) -> eif
env ~
expected ~coalesce
:false p c e1 e2
2074 begin match Env.get_typedef
env (snd sid
) with
2075 | Some
{td_tparams
= tparaml
; _} ->
2076 (* Typedef type parameters cannot have constraints *)
2077 let params = List.map ~f
:begin fun (_, (p, x
), _, _) ->
2078 Reason.Rwitness
p, Tgeneric x
2080 let tdef = Reason.Rwitness
(fst sid
), Tapply
(sid
, params) in
2082 Reason.Rwitness
p, Tapply
((p, SN.Classes.cTypename
), [tdef]) in
2083 let env, tparams
= List.map_env
env tparaml
begin fun env _ ->
2084 Env.fresh_unresolved_type
env
2086 let ety_env = { (Phase.env_with_self
env) with
2087 substs
= Subst.make tparaml tparams
} in
2088 let env = Phase.check_tparams_constraints ~use_pos
:p ~
ety_env env tparaml
in
2089 let env, ty = Phase.localize ~
ety_env env typename in
2090 make_result env (T.Typename sid
) ty
2092 (* Should never hit this case since we only construct this AST node
2093 * if in the expression Foo::class, Foo is a type def.
2095 expr_error env p (Reason.Rwitness
p)
2097 | Class_const
(cid, mid
) -> class_const
env p (cid, mid
)
2098 | Class_get
((px
, x
), (py
, y
))
2099 when Env.FakeMembers.get_static
env x y
<> None
->
2100 Env.error_if_reactive_context
env @@ begin fun () ->
2101 Errors.static_property_in_reactive_context
p
2103 let env, local
= Env.FakeMembers.make_static
p env x y
in
2104 let local = p, Lvar
(p, local) in
2105 let env, _, ty = expr
env local in
2106 let env, te, _ = static_class_id ~check_constraints
:false px
env x
in
2107 make_result env (T.Class_get
(te, (py
, y
))) ty
2108 | Class_get
((cpos
, cid), mid
) ->
2109 Env.error_if_reactive_context
env @@ begin fun () ->
2110 Errors.static_property_in_reactive_context
p
2112 let env, te, cty
= static_class_id ~check_constraints
:false cpos
env cid in
2113 let env = save_and_merge_next_in_catch
env in
2115 class_get ~is_method
:false ~is_const
:false env cty mid
cid in
2116 if Env.FakeMembers.is_static_invalid
env cid (snd mid
)
2118 let fake_name = Env.FakeMembers.make_static_id
cid (snd mid
) in
2119 let env, ty = Env.lost_info
fake_name env ty in
2120 make_result env (T.Class_get
(te, mid
)) ty
2122 make_result env (T.Class_get
(te, mid
)) ty
2123 (* Fake member property access. For example:
2124 * if ($x->f !== null) { ...$x->f... }
2126 | Obj_get
(e, (pid
, Id
(py
, y
)), nf
)
2127 when Env.FakeMembers.get
env e y
<> None
->
2128 let env = save_and_merge_next_in_catch
env in
2129 let env, local = Env.FakeMembers.make
p env e y
in
2130 let local = p, Lvar
(p, local) in
2131 let env, _, ty = expr
env local in
2132 let env, t_lhs
, _ = expr ~accept_using_var
:true env e in
2133 let t_rhs = T.make_typed_expr pid
ty (T.Id
(py
, y
)) in
2134 make_result env (T.Obj_get
(t_lhs
, t_rhs, nf
)) ty
2135 (* Statically-known instance property access e.g. $x->f *)
2136 | Obj_get
(e1
, (pm
, Id m
), nullflavor
) ->
2138 (match nullflavor
with
2139 | OG_nullthrows
-> None
2140 | OG_nullsafe
-> Some
p
2142 let env, te1, ty1 = expr ~accept_using_var
:true env e1
in
2143 let env = save_and_merge_next_in_catch
env in
2145 obj_get ~is_method
:false ~
nullsafe ~
valkind env ty1 (CIexpr e1
) m
(fun x
-> x
) in
2146 let has_lost_info = Env.FakeMembers.is_invalid
env e1
(snd m
) in
2150 let name = "the member " ^ snd m
in
2151 Env.lost_info
name env result
2155 make_result env (T.Obj_get
(te1,
2156 T.make_typed_expr pm result
(T.Id m
), nullflavor
)) result
2157 (* Dynamic instance property access e.g. $x->$f *)
2158 | Obj_get
(e1
, e2
, nullflavor
) ->
2159 let env, te1, ty1 = expr ~accept_using_var
:true env e1
in
2160 let env, te2
, _ = expr
env e2
in
2161 let ty = if TUtils.is_dynamic
env ty1 then
2162 (Reason.Rwitness
p, Tdynamic
) else
2164 if Env.is_strict
env then
2166 Errors.dynamic_method_call
(fst e2
);
2167 (Reason.Rwitness
p, Typing_utils.terr
env)
2170 (Reason.Rwitness
p, Typing_utils.tany
env)
2172 let (pos, _), te2
= te2
in
2173 let env = save_and_merge_next_in_catch
env in
2174 let te2 = T.make_typed_expr
pos ty te2 in
2175 make_result env (T.Obj_get
(te1, te2, nullflavor
)) ty
2177 make_result env T.Yield_break
(Reason.Rwitness
p, Typing_utils.tany
env)
2179 let env, (taf
, opt_key
, value) = array_field
env af
in
2180 let send = Env.fresh_type
() in
2181 let env, key
= match af
, opt_key
with
2182 | Nast.AFvalue
(p, _), None
->
2184 match Env.get_fn_kind
env with
2188 Errors.internal_error
p "yield found in non-generator";
2189 Reason.Rwitness
p, Typing_utils.tany
env
2191 (Reason.Rwitness
p, Tprim Tint
)
2192 | Ast.FAsyncGenerator
->
2193 (Reason.Ryield_asyncnull
p,
2194 Toption
(Env.fresh_type
()))
2199 | _, _ -> assert false in
2200 let rty = match Env.get_fn_kind
env with
2202 (* yield in coroutine is already reported as error in NastCheck *)
2203 let _, _, ty = expr_error env p (Reason.Rwitness
p) in
2206 Reason.Ryield_gen
p,
2207 Tclass
((p, SN.Classes.cGenerator
), [key
; value; send])
2208 | Ast.FAsyncGenerator
->
2209 Reason.Ryield_asyncgen
p,
2210 Tclass
((p, SN.Classes.cAsyncGenerator
), [key
; value; send])
2211 | Ast.FSync
| Ast.FAsync
->
2212 failwith
"Parsing should never allow this" in
2213 let Typing_env_return_info.{ return_type = expected_return
; _ } = Env.get_return
env in
2215 Type.coerce_type
p (Reason.URyield
) env rty expected_return
in
2216 let env = Env.forget_members
env p in
2217 let env = LEnv.save_and_merge_next_in_cont
env C.Exit
in
2218 make_result env (T.Yield taf
) (Reason.Ryield_send
p, Toption
send)
2220 let key = Env.fresh_type
() in
2221 let value = Env.fresh_type
() in
2222 let env, te, yield_from_ty
=
2223 expr ~is_using_clause ~is_expr_statement
env e in
2224 (* Expected type of `e` in `yield from e` is KeyedTraversable<Tk,Tv> (but might be dynamic)*)
2225 let expected_yield_from_ty =
2226 (Reason.Ryield_gen
p,
2227 Tclass
((p, SN.Collections.cKeyedTraversable
), [key; value])) in
2228 let from_dynamic = SubType.is_sub_type
env yield_from_ty
(fst yield_from_ty
, Tdynamic
) in
2231 then env (* all set if dynamic, otherwise need to check against KeyedTraversable *)
2232 else Type.coerce_type
p Reason.URyield_from
env yield_from_ty
expected_yield_from_ty in
2233 let rty = match Env.get_fn_kind
env with
2235 (* yield in coroutine is already reported as error in NastCheck *)
2236 let _, _, ty = expr_error env p (Reason.Rwitness
p) in
2240 then Reason.Ryield_gen
p, Tdynamic
(*TODO: give better reason*)
2241 else Reason.Ryield_gen
p,
2242 Tclass
((p, SN.Classes.cGenerator
), [key; value; (Reason.Rwitness
p, Tprim Tvoid
)])
2243 | Ast.FSync
| Ast.FAsync
| Ast.FAsyncGenerator
->
2244 failwith
"Parsing should never allow this" in
2245 let Typing_env_return_info.{ return_type = expected_return
; _ } = Env.get_return
env in
2247 Type.coerce_type
p (Reason.URyield_from
) env rty expected_return
in
2248 let env = Env.forget_members
env p in
2249 make_result env (T.Yield_from
te) (Reason.Rwitness
p, Tprim Tvoid
)
2251 (* Await is permitted in a using clause e.g. using (await make_handle()) *)
2253 expr ~is_using_clause ~is_expr_statement
2254 ~allow_non_awaited_awaitable_in_rx
:true env e in
2255 let env, ty = Async.overload_extract_from_awaitable
env p rty in
2256 make_result env (T.Await
te) ty
2260 | _, Call
(call_type
, e, hl
, el
, uel
) ->
2261 check_call ~is_using_clause ~
expected ~is_expr_statement
2262 env p call_type
e hl el uel ~in_suspend
:true
2264 let env, te, (r, ty) = expr
env e in
2265 (* not a call - report an error *)
2266 Errors.non_call_argument_in_suspend
2268 (Reason.to_string
("This is " ^
Typing_print.error
ty) r);
2270 make_result env (T.Suspend
te) ty
2272 | Special_func func
-> special_func
env p func
2273 | New
((pos, c), el
, uel
) ->
2274 let env = save_and_merge_next_in_catch
env in
2275 let env, tc
, tel
, tuel
, ty, ctor_fty
=
2276 new_object ~
expected ~is_using_clause ~check_parent
:false ~check_not_abstract
:true
2278 let env = Env.forget_members
env p in
2279 Typing_mutability.enforce_mutable_constructor_call
env ctor_fty tel
;
2280 make_result env (T.New
(tc
, tel
, tuel
)) ty
2281 | Cast
((_, Harray
(None
, None
)), _)
2282 when Env.is_strict
env
2283 || TCO.migration_flag_enabled
(Env.get_tcopt
env) "array_cast" ->
2284 Errors.array_cast
p;
2285 expr_error env p (Reason.Rwitness
p)
2287 let env, te, ty2
= expr
env e in
2288 let env = save_and_merge_next_in_catch
env in
2289 Async.enforce_not_awaitable
env (fst
e) ty2
;
2290 if (TypecheckerOptions.experimental_feature_enabled
2291 (Env.get_options
env)
2292 TypecheckerOptions.experimental_forbid_nullable_cast
)
2293 && TUtils.is_option_non_mixed
env ty2
2295 let (r, ty2
) = ty2
in
2296 Errors.nullable_cast
p (Typing_print.error ty2
) (Reason.to_pos
r)
2298 let env, ty = Phase.localize_hint_with_self
env hint
in
2299 make_result env (T.Cast
(hint
, te)) ty
2300 | InstanceOf
(e, (pos, cid)) ->
2301 let env, te, _ = expr
env e in
2302 let env, te2, _class
= instantiable_cid
pos env cid in
2303 make_result env (T.InstanceOf
(te, te2)) (Reason.Rwitness
p, Tprim Tbool
)
2305 let env, te, _ = expr
env e in
2306 make_result env (T.Is
(te, hint
)) (Reason.Rwitness
p, Tprim Tbool
)
2307 | As
(e, hint
, is_nullable
) ->
2308 let refine_type env lpos lty
rty =
2309 let reason = Reason.Ras lpos
in
2310 let env, rty = Env.expand_type
env rty in
2311 if snd
rty <> Tdynamic
&& SubType.is_sub_type
env lty
rty
2313 else safely_refine_type
env p reason lpos lty
rty
2315 let env, te, expr_ty
= expr
env e in
2316 let ety_env = { (Phase.env_with_self
env) with from_class
= Some CIstatic
; } in
2317 let env, hint_ty = Phase.localize_hint ~
ety_env env hint
in
2320 let env, hint_ty = refine_type env (fst
e) expr_ty
hint_ty in
2322 match snd
hint_ty with
2323 | Toption
_ -> hint_ty (* Dont create ??hint *)
2324 | _ -> Reason.Rwitness
p, Toption
(hint_ty) in
2326 else if is_instance_var
e then
2327 let env, _, ivar_ty
= raw_expr
env e in
2328 let env, ((ivar_pos
, _) as ivar
) = get_instance_var
env e in
2329 let env, hint_ty = refine_type env ivar_pos ivar_ty
hint_ty in
2330 let env = set_local
env ivar
hint_ty in
2333 refine_type env (fst
e) expr_ty
hint_ty
2335 make_result env (T.As
(te, hint
, is_nullable
)) hint_ty
2337 (* This is the function type as declared on the lambda itself.
2338 * If type hints are absent then use Tany instead. *)
2339 let declared_ft = Decl.fun_decl_in_env
env.Env.decl_env f
in
2340 (* When creating a closure, the 'this' type will mean the late bound type
2341 * of the current enclosing class
2344 { (Phase.env_with_self
env) with from_class
= Some CIstatic
} in
2345 let env, declared_ft = Phase.localize_ft ~use_pos
:p ~
ety_env env declared_ft in
2346 List.iter idl
(check_escaping_var
env);
2347 (* Ensure lambda arity is not Fellipsis in strict mode *)
2348 begin match declared_ft.ft_arity
with
2349 | Fellipsis
_ when Env.is_strict
env ->
2350 Errors.ellipsis_strict_mode ~require
:`Param_name
p
2353 (* Is the return type declared? *)
2354 let is_explicit_ret = Option.is_some f
.f_ret
in
2355 let has_rx_of_scope = Attributes.mem
SN.UserAttributes.uaRxOfScope f
.f_user_attributes
in
2357 (* if lambda is annotated with <<__RxOfScope>> use reactivity of enclosing
2358 function as reactivity of lambda *)
2359 if has_rx_of_scope then TR.strip_conditional_reactivity
(Env.env_reactivity
env)
2360 else fun_reactivity env.Env.decl_env f
.f_user_attributes f
.f_params
in
2361 let old_disallow_this = env.Env.disallow_this
in
2363 if reactivity <> Nonreactive
2365 List.iter idl
(check_escaping_mutable
env);
2366 (* disallow referencing $this in lambdas if containing method mutable *)
2367 old_disallow_this || Env.function_is_mutable
env
2370 let check_body_under_known_params ?ret_ty ft
=
2371 let old_reactivity = Env.env_reactivity
env in
2372 let env = { env with Env.disallow_this = disallow_this } in
2373 let env = Env.set_env_reactive
env reactivity in
2374 let old_inside_ppl_class = env.Typing_env.inside_ppl_class
in
2375 let env = { env with Typing_env.inside_ppl_class
= false } in
2376 let (is_coroutine
, _counter
, _, anon
) = anon_make
env p f ft idl
in
2377 let ft = { ft with ft_is_coroutine
= is_coroutine
; ft_reactive
= reactivity } in
2378 let (env, tefun
, ty) = anon ?ret_ty
env ft.ft_params
ft.ft_arity
in
2379 let env = Env.set_env_reactive
env old_reactivity in
2380 let env = { env with
2381 Typing_env.inside_ppl_class
= old_inside_ppl_class;
2382 Env.disallow_this = old_disallow_this } in
2385 then (Reason.Rwitness
p, Tfun
{ ft with ft_ret
= declared_ft.ft_ret
})
2386 else (Reason.Rwitness
p, Tfun
{ ft with ft_ret
= ty }) in
2387 Typing_log.log_types
1 p env
2389 ("Typing.check_body_under_known_params",
2390 [Typing_log.Log_type
("ft", (Reason.Rwitness
p, Tfun
ft));
2391 Typing_log.Log_type
("inferred_ty", inferred_ty)])];
2392 env, tefun
, inferred_ty in
2393 let env, eexpected
= expand_expected
env expected in
2394 begin match eexpected
with
2395 | Some
(_pos
, _ur
, (_, Tfun expected_ft
)) ->
2396 (* First check that arities match up *)
2397 check_lambda_arity
p expected_ft
.ft_pos
declared_ft.ft_arity expected_ft
.ft_arity
;
2398 (* Use declared types for parameters in preference to those determined
2399 * by the context: they might be more general. *)
2400 let rec replace_non_declared_types params declared_ft_params expected_ft_params
=
2401 match params, declared_ft_params
, expected_ft_params
with
2402 | param
::params, declared_ft_param
::declared_ft_params
,
2403 expected_ft_param
::expected_ft_params
->
2404 let rest = replace_non_declared_types params declared_ft_params expected_ft_params
in
2405 let resolved_ft_param = if Option.is_some param
.param_hint
2406 then declared_ft_param
2407 else { declared_ft_param
with fp_type
= expected_ft_param
.fp_type
} in
2408 resolved_ft_param :: rest
2410 (* This means the expected_ft params list can have more parameters
2411 * than declared parameters in the lambda. For variadics, this is OK,
2412 * for non-variadics, this will be caught elsewhere in arity checks.
2416 let replace_non_declared_arity variadic declared_arity expected_arity
=
2418 | FVvariadicArg
{param_hint
= Some
(_); _} -> declared_arity
2419 | FVvariadicArg
_ ->
2421 match declared_arity
, expected_arity
with
2422 | Fvariadic
(min_arity
, declared
), Fvariadic
(_, expected) ->
2423 Fvariadic
(min_arity
, { declared
with fp_type
= expected.fp_type
})
2424 | _, _ -> declared_arity
2426 | _ -> declared_arity
2428 let expected_ft = { expected_ft with ft_arity
=
2429 replace_non_declared_arity
2430 f
.f_variadic
declared_ft.ft_arity
expected_ft.ft_arity
} in
2431 let expected_ft = { expected_ft with ft_params
=
2432 replace_non_declared_types f
.f_params
declared_ft.ft_params
expected_ft.ft_params
} in
2433 (* Don't bother passing in `void` if there is no explicit return *)
2435 match expected_ft.ft_ret
with
2436 | _, Tprim Tvoid
when not
is_explicit_ret -> None
2437 | _ -> Some
expected_ft.ft_ret
in
2438 Typing_log.increment_feature_count
env FL.Lambda.contextual_params
;
2439 check_body_under_known_params ?
ret_ty expected_ft
2441 let explicit_variadic_param_or_non_variadic =
2442 begin match f
.f_variadic
with
2443 | FVvariadicArg
{param_hint
; _} -> Option.is_some param_hint
2444 | FVellipsis
_ -> false
2448 (* If all parameters are annotated with explicit types, then type-check
2449 * the body under those assumptions and pick up the result type *)
2450 let all_explicit_params =
2451 List.for_all f
.f_params
(fun param
-> Option.is_some param
.param_hint
) in
2452 if all_explicit_params && explicit_variadic_param_or_non_variadic
2454 Typing_log.increment_feature_count
env
2455 (if List.is_empty f
.f_params
then FL.Lambda.no_params
else FL.Lambda.explicit_params
);
2456 check_body_under_known_params declared_ft
2460 | Some
(_, _, (_, Tany
)) ->
2461 (* If the expected type is Tany env then we're passing a lambda to an untyped
2462 * function and we just assume every parameter has type Tany env *)
2463 Typing_log.increment_feature_count
env FL.Lambda.untyped_context
;
2464 check_body_under_known_params declared_ft
2466 (* If the expected type is something concrete but not a function
2467 * then we should reject in strict mode. Check body anyway *)
2468 if Env.is_strict
env
2469 then Errors.untyped_lambda_strict_mode
p;
2470 Typing_log.increment_feature_count
env FL.Lambda.non_function_typed_context
;
2471 check_body_under_known_params declared_ft
2473 (* If we're in partial mode then type-check definition anyway,
2474 * so treating parameters without type hints as "untyped"
2476 if not
(Env.is_strict
env) && TypecheckerOptions.untyped_nonstrict_lambda_parameters
2477 (Env.get_options
env)
2479 Typing_log.increment_feature_count
env FL.Lambda.non_strict_unknown_params
;
2480 check_body_under_known_params declared_ft
2483 Typing_log.increment_feature_count
env FL.Lambda.unknown_params
;
2484 Typing_log.log_types
1 p env
2486 ("Typing.expr Efun unknown params",
2487 [Typing_log.Log_type
("declared_ft", (Reason.Rwitness
p, Tfun
declared_ft))])];
2488 (* check for recursive function calls *)
2489 let reactivity = fun_reactivity env.Env.decl_env f
.f_user_attributes f
.f_params
in
2490 let old_reactivity = Env.env_reactivity
env in
2491 let env = Env.set_env_reactive
env reactivity in
2492 let env = { env with Env.disallow_this = disallow_this } in
2493 let is_coroutine, counter
, pos, anon
= anon_make
env p f
declared_ft idl
in
2494 let env, tefun
, _, anon_id
= Errors.try_with_error
2496 let (_, tefun
, ty) = anon
env declared_ft.ft_params
declared_ft.ft_arity
in
2497 let anon_fun = reactivity, is_coroutine, counter
, pos, anon
in
2498 let env, anon_id
= Env.add_anonymous
env anon_fun in
2499 env, tefun
, ty, anon_id
)
2501 (* If the anonymous function declaration has errors itself, silence
2502 them in any subsequent usages. *)
2503 let anon_ign ?el
:_ ?
ret_ty:_ env fun_params
=
2504 Errors.ignore_
(fun () -> (anon
env fun_params
)) in
2505 let (_, tefun
, ty) = anon_ign env declared_ft.ft_params
declared_ft.ft_arity
in
2506 let anon_fun = reactivity, is_coroutine, counter
, pos, anon
in
2507 let env, anon_id
= Env.add_anonymous
env anon_fun in
2508 env, tefun
, ty, anon_id
) in
2509 let env = Env.set_env_reactive
env old_reactivity in
2510 let env = { env with Env.disallow_this = old_disallow_this } in
2511 let anon_ty = (Reason.Rwitness
p, Tanon
(declared_ft.ft_arity
, anon_id
)) in
2512 let ((ep
,_efun_ty
),efun
) = tefun
in
2513 let tefun = ((ep
, anon_ty), efun
) in
2518 | Xml
(sid
, attrl
, el
) ->
2519 let cid = CI
(sid
, []) in
2520 let env, _te
, classes
= class_id_for_new
p env cid in
2521 let class_info = match classes
with
2523 (* OK to ignore rest of list; class_info only used for errors, and
2524 * cid = CI sid cannot produce a union of classes anyhow *)
2525 | (_, class_info, _)::_ -> Some
class_info
2527 let env, _te
, obj
= expr
env (fst sid
, New
((fst sid
, cid), [], [])) in
2528 let env, typed_attrs
, attr_types
= xhp_attribute_exprs
env class_info attrl
in
2529 let env, tel
= List.map_env
env el ~f
:(fun env e -> let env, te, _ = expr
env e in env, te) in
2530 let txml = T.Xml
(sid
, typed_attrs
, List.rev tel
) in
2531 (match class_info with
2532 | None
-> make_result env txml (Reason.Runknown_class
p, Tobject
)
2533 | Some
class_info ->
2534 let env = List.fold_left attr_types ~f
:begin fun env attr
->
2535 let namepstr, valpty
= attr
in
2536 let valp, valty
= valpty
in
2538 obj_get ~is_method
:false ~
nullsafe:None
env obj
cid
2539 namepstr (fun x
-> x
) in
2540 let ureason = Reason.URxhp
(class_info.tc_name
, snd
namepstr) in
2541 Type.coerce_type
valp ureason env valty declty
2543 make_result env txml obj
2546 (* Do not run inference on the expression, since unsafe is sometimes used to
2547 work around inference performance problems. *)
2548 let tcopt = Env.get_tcopt
env in
2549 let te = NastTanyMapper.map_expr
(ntm_env tcopt) e in
2550 make_result env (T.Unsafe_expr
te) (Reason.Rnone
, Tany
)
2551 | Callconv
(kind
, e) ->
2552 let env, te, ty = expr
env e in
2553 make_result env (T.Callconv
(kind
, te)) ty
2554 (* TODO TAST: change AST so that order of shape expressions is preserved.
2555 * At present, evaluation order is unspecified in TAST *)
2557 let env, fdm_with_expected
=
2558 match expand_expected
env expected with
2559 | env, Some
(pos, ur
, (_, Tshape
(_, expected_fdm
))) ->
2563 match ShapeMap.get k expected_fdm
with
2565 | Some sft
-> (v
, Some
(pos, ur
, sft
.sft_ty
))) fdm
in
2568 env, ShapeMap.map
(fun v
-> (v
, None
)) fdm
in
2570 (* allow_inter adds a type-variable *)
2573 (fun env _key
(e, expected) ->
2574 let env, te, ty = expr ?
expected env e in env, (te,ty))
2575 env fdm_with_expected
in
2577 let convert_expr_and_type_to_shape_field_type env _key
(_, ty) =
2578 let env, sft_ty
= TUtils.unresolved
env ty in
2579 (* An expression evaluation always corresponds to a shape_field_type
2580 with sft_optional = false. *)
2581 env, { sft_optional
= false; sft_ty
} in
2582 ShapeMap.map_env
convert_expr_and_type_to_shape_field_type env tfdm
in
2583 let env = check_shape_keys_validity
env p (ShapeMap.keys fdm
) in
2584 (* Fields are fully known, because this shape is constructed
2585 * using shape keyword and we know exactly what fields are set. *)
2586 make_result env (T.Shape
(ShapeMap.map
(fun (te,_) -> te) tfdm
))
2587 (Reason.Rwitness
p, Tshape
(FieldsFullyKnown
, fdm
))
2588 with Typing_lenv_cont.Continuation_not_found
_ ->
2589 expr_error env p (Reason.Rwitness
p)
2591 and class_const ?
(incl_tc
=false) env p ((cpos
, cid), mid
) =
2592 let env, ce
, cty
= static_class_id ~check_constraints
:false cpos
env cid in
2593 let env, const_ty
, cc_abstract_info
=
2594 class_get ~is_method
:false ~is_const
:true ~incl_tc
env cty mid
cid in
2595 match cc_abstract_info
with
2596 | Some
(cc_pos
, cc_name
) ->
2597 let () = match cid with
2598 | CIstatic
| CIexpr
_ -> ();
2599 | _ -> Errors.abstract_const_usage
p cc_pos cc_name
; ()
2600 in env, T.make_typed_expr
p const_ty
(T.Class_const
(ce
, mid
)), const_ty
2602 env, T.make_typed_expr
p const_ty
(T.Class_const
(ce
, mid
)), const_ty
2604 and anon_sub_type
pos ur
env ty_sub ty_super
=
2605 Errors.try_add_err
pos (Reason.string_of_ureason ur
)
2606 (fun () -> SubType.sub_type
env ty_sub ty_super
)
2609 and anon_coerce_type
pos ur
env ty_have ty_expect
=
2610 Typing_ops.coerce_type ~sub_fn
:anon_sub_type
pos ur
env ty_have ty_expect
2612 (*****************************************************************************)
2613 (* XHP attribute/body helpers. *)
2614 (*****************************************************************************)
2616 * Process a spread operator by computing the intersection of XHP attributes
2617 * between the spread expression and the XHP constructor onto which we're
2620 and xhp_spread_attribute
env c_onto valexpr
=
2621 let (p, _) = valexpr
in
2622 let env, te, valty
= expr
env valexpr
in
2623 (* Build the typed attribute node *)
2624 let typed_attr = T.Xhp_spread
te in
2625 let env, attr_ptys
= match c_onto
with
2627 | Some
class_info -> Typing_xhp.get_spread_attributes
env p class_info valty
2628 in env, typed_attr, attr_ptys
2631 * Simple XHP attributes (attr={expr} form) are simply interpreted as a member
2632 * variable prefixed with a colon, the types of which will be validated later
2634 and xhp_simple_attribute
env id valexpr
=
2635 let (p, _) = valexpr
in
2636 let env, te, valty
= expr
env valexpr
in
2637 (* This converts the attribute name to a member name. *)
2638 let name = ":"^
(snd
id) in
2639 let attr_pty = ((fst
id, name), (p, valty
)) in
2640 let typed_attr = T.Xhp_simple
(id, te) in
2641 env, typed_attr, [attr_pty]
2645 * Typecheck the attribute expressions - this just checks that the expressions are
2646 * valid, not that they match the declared type for the attribute and,
2647 * in case of spreads, makes sure they are XHP.
2649 and xhp_attribute_exprs
env cid attrl
=
2650 let handle_attr (env, typed_attrl
, attr_ptyl
) attr
=
2651 let env, typed_attr, attr_ptys
= match attr
with
2652 | Xhp_simple
(id, valexpr
) -> xhp_simple_attribute
env id valexpr
2653 | Xhp_spread valexpr
-> xhp_spread_attribute
env cid valexpr
2655 env, typed_attr::typed_attrl
, attr_ptys
@ attr_ptyl
2657 let env, typed_attrl
, attr_ptyl
= List.fold_left ~f
:handle_attr ~init
:(env, [], []) attrl
in
2658 env, List.rev typed_attrl
, List.rev attr_ptyl
2660 (*****************************************************************************)
2661 (* Anonymous functions. *)
2662 (*****************************************************************************)
2663 and anon_bind_param
params (env, t_params
) ty : Env.env * Tast.fun_param list
=
2666 (* This code cannot be executed normally, because the arity is wrong
2667 * and it will error later. Bind as many parameters as we can and carry
2670 | param
:: paraml
->
2672 match param
.param_hint
with
2675 let h = Decl_hint.hint
env.Env.decl_env
h in
2676 (* When creating a closure, the 'this' type will mean the
2677 * late bound type of the current enclosing class
2680 { (Phase.env_with_self
env) with from_class
= Some CIstatic
} in
2681 let env, h = Phase.localize ~
ety_env env h in
2682 let pos = Reason.to_pos
(fst
ty) in
2683 (* Don't use Type.coerce_type as it resets env.Env.pos unnecessarily *)
2684 let env = anon_coerce_type
pos Reason.URparam
env ty h in
2685 (* Closures are allowed to have explicit type-hints. When
2686 * that is the case we should check that the argument passed
2687 * is compatible with the type-hint.
2688 * The body of the function should be type-checked with the
2689 * hint and not the type of the argument passed.
2690 * Otherwise it leads to strange results where
2691 * foo(?string $x = null) is called with a string and fails to
2692 * type-check. If $x is a string instead of ?string, null is not
2693 * subtype of string ...
2695 let env, t_param
= bind_param env (h, param
) in
2696 env, t_params
@ [t_param
]
2698 let env, t_param
= bind_param env (ty, param
) in
2699 env, t_params
@ [t_param
]
2701 and anon_bind_variadic
env vparam variadic_ty
=
2703 match vparam
.param_hint
with
2705 (* if the hint is missing, use the type we expect *)
2706 env, variadic_ty
, Reason.to_pos
(fst variadic_ty
)
2708 let h = Decl_hint.hint
env.Env.decl_env hint
in
2710 { (Phase.env_with_self
env) with from_class
= Some CIstatic
; } in
2711 let env, h = Phase.localize ~
ety_env env h in
2712 let pos = Reason.to_pos
(fst variadic_ty
) in
2713 let env = anon_coerce_type
pos Reason.URparam
env variadic_ty
h in
2714 env, h, vparam
.param_pos
2716 let r = Reason.Rvar_param
pos in
2717 let arr_values = r, (snd
ty) in
2718 let ty = r, Tarraykind
(AKvarray
arr_values) in
2719 let env, t_variadic
= bind_param env (ty, vparam
) in
2723 and anon_bind_opt_param
env param
: Env.env =
2724 match param
.param_expr
with
2726 let ty = Reason.Rwitness param
.param_pos
, Typing_utils.tany
env in
2727 let env, _ = bind_param env (ty, param
) in
2730 let env, _te
, ty = expr
env default
in
2731 Typing_sequencing.sequence_check_expr default
;
2732 let env, _ = bind_param env (ty, param
) in
2735 and anon_check_param
env param
=
2736 match param
.param_hint
with
2739 let env, hty
= Phase.localize_hint_with_self
env hty
in
2740 let paramty = Env.get_local
env (Local_id.get param
.param_name
) in
2741 let hint_pos = Reason.to_pos
(fst hty
) in
2742 let env = Type.coerce_type
hint_pos Reason.URhint
env paramty hty
in
2745 and anon_block
env b
=
2746 let is_not_next = function C.Next
-> false | _ -> true in
2747 let all_but_next = List.filter
C.all ~f
:is_not_next in
2748 let env, (tb, implicit_return
) = LEnv.stash_and_do
env all_but_next (
2750 let env, tb = block
env b
in
2751 let implicit_return = LEnv.has_next
env in
2752 env, (tb, implicit_return)) in
2753 env, tb, implicit_return
2755 (* Make a type-checking function for an anonymous function. *)
2756 and anon_make tenv
p f
ft idl
=
2757 let anon_lenv = tenv
.Env.lenv in
2758 let is_typing_self = ref false in
2759 let nb = Nast.assert_named_body f
.f_body
in
2760 let is_coroutine = f
.f_fun_kind
= Ast.FCoroutine
in
2764 (* Here ret_ty should include Awaitable wrapper *)
2765 fun ?el ?
ret_ty env supplied_params supplied_arity
->
2768 Errors.anonymous_recursive
p;
2769 expr_error env p (Reason.Rwitness
p)
2772 is_typing_self := true;
2773 Env.anon
anon_lenv env begin fun env ->
2774 let env = Env.clear_params
env in
2775 let make_variadic_arg env varg tyl
=
2776 let remaining_types =
2777 (* It's possible the variadic arg will capture the variadic
2778 * parameter of the supplied arity (if arity is Fvariadic)
2779 * and additional supplied params.
2781 * For example in cases such as:
2782 * lambda1 = (int $a, string...$c) ==> {};
2783 * lambda1(1, "hello", ...$y); (where $y is a variadic string)
2784 * lambda1(1, "hello", "world");
2785 * then ...$c will contain "hello" and everything in $y in the first
2786 * example, and "hello" and "world" in the second example.
2788 * To account for a mismatch in arity, we take the remaining supplied
2789 * parameters and return a list of all their types. We'll use this
2790 * to create a union type when creating the typed variadic arg.
2792 let remaining_params = List.drop supplied_params
(List.length f
.f_params
) in
2793 List.map ~f
:(fun param
-> param
.fp_type
) remaining_params
2795 let r = Reason.Rvar_param
(varg
.param_pos
) in
2796 let union = Tunresolved
(tyl
@ remaining_types) in
2797 let env, t_param
= anon_bind_variadic
env varg
(r, union) in
2798 env, T.FVvariadicArg t_param
2800 let env, t_variadic
=
2801 begin match f
.f_variadic
, supplied_arity
with
2802 | FVvariadicArg arg
, Fvariadic
(_, variadic
) ->
2803 make_variadic_arg env arg
[variadic
.fp_type
]
2804 | FVvariadicArg arg
, Fstandard
_ ->
2805 make_variadic_arg env arg
[]
2806 | FVellipsis
pos, _ -> env, T.FVellipsis
pos
2807 | _, _ -> env, T.FVnonVariadic
2809 let params = ref f
.f_params
in
2810 let env, t_params
= List.fold_left ~f
:(anon_bind_param
params) ~init
:(env, [])
2811 (List.map supplied_params
(fun x
-> x
.fp_type
)) in
2812 let env = List.fold_left ~f
:anon_bind_opt_param ~init
:env !params in
2813 let env = List.fold_left ~f
:anon_check_param ~init
:env f
.f_params
in
2814 let env = match el
with
2816 iter2_shortest
Unify.unify_param_modes
ft.ft_params supplied_params
;
2819 let var_param = match f
.f_variadic
with
2821 let param = TUtils.default_fun_param ~
pos
2822 (Reason.Rvar_param
pos, Tany
) in
2825 let rec iter l1 l2
=
2826 match l1
, l2
, var_param with
2829 | [], x2
::rl2
, Some def1
->
2830 param_modes ~is_variadic
:true def1 x2
;
2832 | x1
::rl1
, x2
::rl2
, _ -> param_modes x1 x2
; iter rl1 rl2
2834 iter ft.ft_params x
;
2835 wfold_left2 inout_write_back
env ft.ft_params x
in
2836 let env = Env.set_fn_kind
env f
.f_fun_kind
in
2840 (* Do we have a contextual return type? *)
2841 begin match ret_ty with
2843 let env, ret_ty = Env.fresh_unresolved_type
env in
2844 env, Typing_return.wrap_awaitable
env p ret_ty
2846 (* We might need to force it to be Awaitable if it is a type variable *)
2847 Typing_return.force_awaitable
env p ret_ty
2850 let ret = TI.instantiable_hint
env x
in
2851 (* If a 'this' type appears it needs to be compatible with the
2855 { (Phase.env_with_self
env) with
2856 from_class
= Some CIstatic
} in
2857 Phase.localize ~
ety_env env ret in
2858 let env = Env.set_return
env
2859 (Typing_return.make_info f
.f_fun_kind
[] env
2860 ~is_explicit
:(Option.is_some
ret_ty)
2861 ~is_by_ref
:f
.f_ret_by_ref
2863 let local_tpenv = env.Env.lenv.Env.tpenv
in
2864 let env, tb, implicit_return = anon_block
env nb.fnb_nast
in
2866 if not
implicit_return || nb.fnb_unsafe
|| !auto_complete
2868 else fun_implicit_return
env p hret f
.f_fun_kind
2870 (* We don't want the *uses* of the function to affect its return type *)
2871 let env, hret
= Env.unbind
env hret
in
2872 is_typing_self := false;
2874 T.f_annotation
= Env.save
local_tpenv env;
2875 T.f_mode
= f
.f_mode
;
2877 T.f_name
= f
.f_name
;
2878 T.f_tparams
= f
.f_tparams
;
2879 T.f_where_constraints
= f
.f_where_constraints
;
2880 T.f_fun_kind
= f
.f_fun_kind
;
2881 T.f_user_attributes
= List.map f
.f_user_attributes
(user_attribute
env);
2882 T.f_body
= T.NamedBody
{
2884 T.fnb_unsafe
= nb.fnb_unsafe
;
2886 T.f_params
= t_params
;
2887 T.f_variadic
= t_variadic
; (* TODO TAST: Variadic efuns *)
2888 T.f_ret_by_ref
= f
.f_ret_by_ref
;
2889 T.f_external
= f
.f_external
;
2891 let ty = (Reason.Rwitness
p, Tfun
ft) in
2892 let te = T.make_typed_expr
p ty (T.Efun
(tfun_, idl
)) in
2897 (*****************************************************************************)
2898 (* End of anonymous functions. *)
2899 (*****************************************************************************)
2901 and special_func
env p func
=
2902 let env, tfunc
, ty = (match func
with
2904 let env, te, ety
= expr
env e in
2905 let env, ty = Async.gena
env p ety
in
2908 let env, tel
, etyl
= exprs ~allow_non_awaited_awaitable_in_rx
:true env el
in
2909 let env, ty = Async.genva
env p etyl
in
2910 env, T.Genva tel
, ty
2911 | Gen_array_rec
e ->
2912 let env, te, ety
= expr
env e in
2913 let env, ty = Async.gen_array_rec
env p ety
in
2914 env, T.Gen_array_rec
te, ty
2917 (Reason.Rwitness
p, Tclass
((p, SN.Classes.cAwaitable
), [ty])) in
2918 env, T.make_typed_expr
p result_ty (T.Special_func tfunc
), result_ty
2920 and requires_consistent_construct
= function
2927 (* Caller will be looking for a particular form of expected type
2928 * e.g. a function type (when checking lambdas) or tuple type (when checking
2929 * tuples). First expand the expected type and elide single union; also
2930 * strip nullables, so ?t becomes t, as context will always accept a t if a ?t
2933 and expand_expected
env expected =
2937 | Some
(p, ur
, ty) ->
2938 let env, ty = Env.expand_type
env ty in
2940 | _, Tunresolved
[ty] -> env, Some
(p, ur
, ty)
2941 | _, Toption
ty -> env, Some
(p, ur
, ty)
2942 | _, Tmixed
-> env, Some
(p, ur
, (Reason.Rnone
, Tnonnull
))
2943 | _ -> env, Some
(p, ur
, ty)
2945 (* Do a subtype check of inferred type against expected type *)
2946 and check_expected_ty message
env inferred_ty expected =
2950 | Some
(p, ur
, expected_ty
) ->
2951 Typing_log.log_types
1 p env
2953 (Printf.sprintf
"Typing.check_expected_ty %s" message
,
2954 [Typing_log.Log_type
("inferred_ty", inferred_ty);
2955 Typing_log.Log_type
("expected_ty", expected_ty
)])];
2956 Type.coerce_type
p ur
env inferred_ty expected_ty
2958 and new_object ~
expected ~check_parent ~check_not_abstract ~is_using_clause
p env cid el uel
=
2959 (* Obtain class info from the cid expression. We get multiple
2960 * results with a CIexpr that has a union type *)
2961 let env, tcid
, classes
= instantiable_cid
p env cid in
2962 let finish env tcid tel tuel
ty ctor_fty
=
2964 if check_parent
then env, ty
2965 else ExprDepTy.make
env cid ty in
2966 env, tcid
, tel
, tuel
, new_ty
, ctor_fty
in
2967 let rec gather env tel tuel res classes
=
2973 let env, tel
, _ = exprs env el
in
2974 let env, tuel
, _ = exprs env uel
in
2975 let r = Reason.Runknown_class
p in
2976 finish env tcid tel tuel
(r, Tobject
) (r, TUtils.terr
env)
2977 | [ty,ctor_fty
] -> finish env tcid tel tuel
ty ctor_fty
2979 let tyl, ctyl
= List.unzip l
in
2980 let r = Reason.Rwitness
p in
2981 finish env tcid tel tuel
(r, Tunresolved
tyl) (r, Tunresolved ctyl
)
2984 | (cname
, class_info, c_ty
)::classes
->
2985 if check_not_abstract
&& class_info.tc_abstract
2986 && not
(requires_consistent_construct
cid) then
2987 uninstantiable_error
p cid class_info.tc_pos
class_info.tc_name
p c_ty
;
2988 let env, obj_ty_
, params =
2989 match cid, snd c_ty
with
2990 | CI
(_, _::_), Tclass
(_, tyl) -> env, (snd c_ty
), tyl
2992 let env, params = List.map_env
env class_info.tc_tparams
2993 (fun env _ -> Env.fresh_unresolved_type
env) in
2994 env, (Tclass
(cname
, params)), params in
2995 if not check_parent
&& not is_using_clause
&& class_info.tc_is_disposable
2996 then Errors.invalid_new_disposable
p;
2997 let r_witness = Reason.Rwitness
p in
2998 let obj_ty = (r_witness, obj_ty_
) in
3001 | CIstatic
-> (r_witness, TUtils.this_of
obj_ty)
3002 | CIexpr
_ -> (r_witness, snd
c_ty)
3007 else ExprDepTy.make
env cid c_ty in
3008 let env, _tcid
, tel
, tuel
, ctor_fty
=
3009 let env = check_expected_ty
"New" env new_ty
expected in
3010 call_construct
p env class_info params el uel
cid in
3011 if not
(snd
class_info.tc_construct
) then
3013 | CIstatic
-> Errors.new_inconsistent_construct
p cname `static
3014 | CIexpr
_ -> Errors.new_inconsistent_construct
p cname `classname
3019 match (fst
class_info.tc_construct
) with
3020 | Some
{ce_type
= lazy ty; _ } ->
3022 type_expansions
= [];
3023 substs
= SMap.empty
;
3026 validate_dty
= None
;
3028 let _, ctor_fty = Phase.localize ~
ety_env env ty in
3029 check_abstract_parent_meth
SN.Members.__construct
p ctor_fty
3032 gather env tel tuel
((obj_ty,ctor_fty)::res
) classes
3033 | CIstatic
| CI
_ | CIself
-> gather env tel tuel
((c_ty,ctor_fty)::res
) classes
3035 (* When constructing from a (classname) variable, the variable
3036 * dictates what the constructed object is going to be. This allows
3037 * for generic and dependent types to be correctly carried
3038 * through the 'new $foo()' iff the constructed obj_ty is a
3039 * supertype of the variable-dictated c_ty *)
3040 let env = SubType.sub_type
env c_ty obj_ty in
3041 gather env tel tuel
((c_ty,ctor_fty)::res
) classes
3043 gather env [] [] [] classes
3045 (* FIXME: we need to separate our instantiability into two parts. Currently,
3046 * all this function is doing is checking if a given type is inhabited --
3047 * that is, whether there are runtime values of type T. However,
3048 * instantiability should be the stricter notion that T has a runtime
3049 * constructor; that is, `new T()` should be valid. In particular, interfaces
3050 * are inhabited, but not instantiable.
3051 * To make this work with classname, we likely need to add something like
3052 * concrete_classname<T>, where T cannot be an interface.
3054 and instantiable_cid
p env cid =
3055 let env, te, classes
= class_id_for_new
p env cid in
3057 List.iter classes
begin fun ((pos, name), class_info, c_ty) ->
3058 if class_info.tc_kind
= Ast.Ctrait
|| class_info.tc_kind
= Ast.Cenum
3061 | CIexpr
_ | CI
_ ->
3062 uninstantiable_error
p cid class_info.tc_pos
name pos c_ty
3063 | CIstatic
| CIparent
| CIself
-> ()
3064 else if class_info.tc_kind
= Ast.Cabstract
&& class_info.tc_final
3066 uninstantiable_error
p cid class_info.tc_pos
name pos c_ty
3071 and uninstantiable_error reason_pos
cid c_tc_pos c_name c_usage_pos
c_ty =
3072 let reason_msgl = match cid with
3074 let ty_str = "This would be "^
Typing_print.error
(snd
c_ty) in
3075 [(reason_pos
, ty_str)]
3077 Errors.uninstantiable_class c_usage_pos c_tc_pos c_name
reason_msgl
3079 and exception_ty
pos env ty =
3080 let exn_ty = Reason.Rthrow
pos, Tclass
((pos, SN.Classes.cThrowable
), []) in
3081 Type.sub_type
pos (Reason.URthrow
) env ty exn_ty
3083 and shape_field_pos
= function
3084 | Ast.SFlit_int
(p, _) | Ast.SFlit_str
(p, _) -> p
3085 | Ast.SFclass_const
((cls_pos
, _), (mem_pos
, _)) -> Pos.btw cls_pos mem_pos
3087 and check_shape_keys_validity
env pos keys =
3088 (* If the key is a class constant, get its class name and type. *)
3089 let get_field_info env key =
3090 let key_pos = shape_field_pos
key in
3091 (* Empty strings or literals that start with numbers are not
3092 permitted as shape field names. *)
3094 | Ast.SFlit_int
_ ->
3096 | Ast.SFlit_str
(_, key_name
) ->
3097 if (String.length key_name
= 0) then
3098 (Errors.invalid_shape_field_name_empty
key_pos)
3099 else if (key_name
.[0] >= '
0'
&& key_name
.[0] <='
9'
) then
3100 (Errors.invalid_shape_field_name_number
key_pos);
3102 | Ast.SFclass_const
(p, cls
as x
, y
) ->
3103 let env, _te
, ty = class_const
env pos ((p, CI
(x
, [])), y
) in
3104 let env = Typing_enum.check_valid_array_key_type
3105 Errors.invalid_shape_field_type ~allow_any
:false
3107 env, key_pos, Some
(cls
, ty))
3110 let check_field witness_pos witness_info
env key =
3111 let env, key_pos, key_info
= get_field_info env key in
3112 (match witness_info
, key_info
with
3114 Errors.invalid_shape_field_literal
key_pos witness_pos
; env
3116 Errors.invalid_shape_field_const
key_pos witness_pos
; env
3118 | Some
(cls1
, ty1), Some
(cls2
, ty2
) ->
3119 if cls1
<> cls2
then
3120 Errors.shape_field_class_mismatch
3121 key_pos witness_pos
(strip_ns cls2
) (strip_ns cls1
);
3122 (* We want to use our own error message here instead of the normal
3123 * unification one. *)
3125 (fun () -> Unify.iunify
env ty1 ty2
)
3127 Errors.shape_field_type_mismatch
3129 (Typing_print.error
(snd ty2
)) (Typing_print.error
(snd
ty1));
3133 (* Sort the keys by their positions since the error messages will make
3134 * more sense if we take the one that appears first as canonical and if
3135 * they are processed in source order. *)
3136 let cmp_keys x y
= Pos.compare
(shape_field_pos x
) (shape_field_pos y
) in
3137 let keys = List.sort
cmp_keys keys in
3141 | witness
:: rest_keys
->
3142 let env, pos, info
= get_field_info env witness
in
3143 List.fold_left ~f
:(check_field pos info
) ~init
:env rest_keys
3145 and set_valid_rvalue
p env x
ty =
3146 let env = set_local
env (p, x
) ty in
3147 (* We are assigning a new value to the local variable, so we need to
3148 * generate a new expression id
3150 let env = Env.set_local_expr_id
env x
(Ident.tmp
()) in
3153 (* Deal with assignment of a value of type ty2 to lvalue e1 *)
3154 and assign
p env e1 ty2
: _ * T.expr
* T.ty =
3155 assign_
p Reason.URassign
env e1 ty2
3157 and assign_
p ur
env e1 ty2
=
3158 let make_result env te1 ty1 = (env, T.make_typed_expr
(fst e1
) ty1 te1, ty1) in
3160 | (_, Lvar
((_, x
) as id)) ->
3161 let env, ty1 = set_valid_rvalue
p env x ty2
in
3162 make_result env (T.Lvar
id) ty1
3163 | (_, Lplaceholder
id) ->
3164 let placeholder_ty = Reason.Rplaceholder
p, (Tprim Tvoid
) in
3165 make_result env (T.Lplaceholder
id) placeholder_ty
3167 let env, folded_ty2
= TUtils.fold_unresolved
env ty2
in
3169 try_over_concrete_supertypes env folded_ty2
3170 begin fun env ty2
->
3172 (* Vector<t> or ImmVector<t> or ConstVector<t> or vec<T> *)
3173 | (_, Tclass
((_, x
), [elt_type
]))
3174 when x
= SN.Collections.cVector
3175 || x
= SN.Collections.cImmVector
3176 || x
= SN.Collections.cVec
3177 || x
= SN.Collections.cConstVector
->
3178 (* Vector assignment is illegal in a reactive context
3179 but vec assignment is okay *)
3180 if x
<> SN.Collections.cVec
3181 then Env.error_if_reactive_context
env @@ begin fun () ->
3182 Errors.nonreactive_append
p
3184 let env, tel
= List.map_env
env el
begin fun env e ->
3185 let env, te, _ = assign
(fst
e) env e elt_type
in
3188 make_result env (T.List tel
) ty2
3189 (* array<t> or varray<t> *)
3190 | (_, Tarraykind
(AKvec elt_type
))
3191 | (_, Tarraykind
(AKvarray elt_type
)) ->
3192 let env, tel
= List.map_env
env el
begin fun env e ->
3193 let env, te, _ = assign
(fst
e) env e elt_type
in
3196 make_result env (T.List tel
) ty2
3197 (* array or empty array or Tany *)
3198 | (r, (Tarraykind
(AKany
| AKempty
) | Tany
)) ->
3199 let env, tel
= List.map_env
env el
begin fun env e ->
3200 let env, te, _ = assign
(fst
e) env e (r, Typing_utils.tany
env) in
3203 make_result env (T.List tel
) ty2
3204 | (r, (Tdynamic
)) ->
3205 let env, tel
= List.map_env
env el
begin fun env e ->
3206 let env, te, _ = assign
(fst
e) env e (r, Tdynamic
) in
3209 make_result env (T.List tel
) ty2
3211 | ((r, Tclass
((_, coll
), [ty1; ty2
])) as folded_ety2
)
3212 when coll
= SN.Collections.cPair
->
3215 let env, te1, _ = assign
p env x1
ty1 in
3216 let env, te2, _ = assign
p env x2 ty2
in
3217 make_result env (T.List
[te1; te2]) folded_ety2
3219 Errors.pair_arity
p;
3220 make_result env T.Any
(r, Typing_utils.terr
env))
3221 (* tuple-like array *)
3222 | (r, Tarraykind
(AKtuple fields
)) ->
3224 let p2 = Reason.to_pos
r in
3225 let tyl = List.rev
(IMap.values fields
) in
3226 let size1 = List.length el
in
3227 let size2 = List.length
tyl in
3230 Errors.tuple_arity
p2 size2 p1 size1;
3231 make_result env T.Any
(r, Typing_utils.terr
env)
3234 let env, reversed_tel
=
3235 List.fold2_exn el
tyl ~f
:begin fun (env,tel
) lvalue ty2
->
3236 let env, te, _ = assign
p env lvalue ty2
in
3238 end ~init
:(env,[]) in
3239 make_result env (T.List
(List.rev reversed_tel
)) ty2
3240 (* Other, including tuples. Create a tuple type for the left hand
3241 * side and attempt subtype against it. In particular this deals with
3242 * types such as (string,int) | (int,bool) *)
3245 List.map_env
env el
(fun env _ -> Env.fresh_unresolved_type
env) in
3246 let env = Type.sub_type
p ur
env folded_ty2
3247 (Reason.Rwitness
(fst e1
), Ttuple
tyl) in
3248 let env, reversed_tel
=
3249 List.fold2_exn el
tyl ~init
:(env,[]) ~f
:(fun (env,tel
) lvalue ty2
->
3250 let env, te, _ = assign
p env lvalue ty2
in
3252 make_result env (T.List
(List.rev reversed_tel
)) ty2
3254 begin match resl with
3256 | _ -> assign_simple
p ur
env e1 ty2
3259 | pobj
, Obj_get
(obj
, (pm
, Id
(_, member_name
as m
)), nullflavor
) ->
3260 let lenv = env.Env.lenv in
3261 let no_fakes = LEnv.env_with_empty_fakes
env in
3262 (* In this section, we check that the assignment is compatible with
3263 * the real type of a member. Remember that members can change
3264 * type (cf fake_members). But when we assign a value to $this->x,
3265 * we want to make sure that the type assign to $this->x is compatible
3266 * with the actual type hint. In this portion of the code, type-check
3267 * the assignment in an environment without fakes, and therefore
3268 * check that the assignment is compatible with the type of
3271 let nullsafe = match nullflavor
with
3272 | OG_nullthrows
-> None
3273 | OG_nullsafe
-> Some pobj
in
3274 let env, tobj, obj_ty = expr ~accept_using_var
:true no_fakes obj
in
3275 let env = save_and_merge_next_in_catch
env in
3276 let env, ty2'
= Env.unbind
env ty2
in
3277 let k (env, member_ty
, vis
) =
3278 let env = Type.coerce_type
p ur
env ty2' member_ty
in
3279 env, member_ty
, vis
in
3281 obj_get ~is_method
:false ~
nullsafe ~
valkind:`lvalue
3282 env obj_ty (CIexpr e1
) m
k in
3284 T.make_typed_expr pobj result
3286 (tobj, T.make_typed_expr pm result
(T.Id m
), nullflavor
)) in
3287 let env = { env with Env.lenv = lenv } in
3288 begin match obj
with
3290 let env, local = Env.FakeMembers.make
p env obj member_name
in
3291 let env, exp_real_type
= Env.expand_type
env result
in
3292 Typing_suggest.save_member member_name
env exp_real_type ty2
;
3293 let env, ty = set_valid_rvalue
p env local ty2
in
3296 let env, local = Env.FakeMembers.make
p env obj member_name
in
3297 let env, ty = set_valid_rvalue
p env local ty2
in
3299 | _ -> env, te1, ty2
3302 let lenv = env.Env.lenv in
3303 let no_fakes = LEnv.env_with_empty_fakes
env in
3304 let env, te1, real_type
= lvalue
no_fakes e1
in
3305 let env, exp_real_type
= Env.expand_type
env real_type
in
3306 let env = { env with Env.lenv = lenv } in
3307 let env, ty2'
= Env.unbind
env ty2
in
3308 let env = Type.coerce_type
p ur
env ty2' exp_real_type
in
3310 | _, Class_get
((_, x
), (_, y
)) ->
3311 let lenv = env.Env.lenv in
3312 let no_fakes = LEnv.env_with_empty_fakes
env in
3313 let env, te1, real_type
= lvalue
no_fakes e1
in
3314 let env, exp_real_type
= Env.expand_type
env real_type
in
3315 let env = { env with Env.lenv = lenv } in
3316 let env, ety2
= Env.expand_type
env ty2
in
3317 let real_type_list =
3318 match exp_real_type
with
3319 | _, Tunresolved
tyl -> tyl
3322 let env = List.fold_left
real_type_list ~f
:begin fun env real_type
->
3323 Type.coerce_type
p ur
env ety2 real_type
3325 let env, local = Env.FakeMembers.make_static
p env x y
in
3326 let env, ty3
= set_valid_rvalue
p env local ty2
in
3330 Typing_suggest.save_member y
env exp_real_type ty2
;
3333 | pos, Array_get
(e1
, None
) ->
3334 let env, _, ty1 = update_array_type
pos env e1 None `lvalue
in
3335 let env, (ty1'
, ty2'
) = assign_array_append
p ur
env ty1 ty2
in
3336 let env, te1, _ = assign_
p ur
env e1
ty1'
in
3337 env, ((pos, ty2'
), T.Array_get
(te1, None
)), ty2
3338 | _, Array_get
((_, Lvar
(_, lvar
)) as shape
, ((Some
_) as e2
)) ->
3339 let access_type = Typing_arrays.static_array_access
env e2
in
3340 (* In the case of an assignment of the form $x['new_field'] = ...;
3341 * $x could be a shape where the field 'new_field' is not yet defined.
3342 * When that is the case we want to add the field to its type.
3344 let env, _te
, shape_ty
= expr
env shape
in
3345 let env, shape_ty
= Typing_arrays.update_array_type_on_lvar_assignment
3346 p access_type env shape_ty
in
3347 let env, _ = set_valid_rvalue
p env lvar shape_ty
in
3348 (* We still need to call assign_simple in order to bind the freshly
3349 * created variable in added shape field. Moreover, it's needed because
3350 * shape_ty could be more than just a shape. It could be an unresolved
3351 * type where some elements are shapes and some others are not.
3353 assign_simple
p ur
env e1 ty2
3355 Errors.this_lvalue
p;
3356 make_result env T.Any
(Reason.Rwitness
p, Typing_utils.terr
env)
3357 | pref
, Unop
(Ast.Uref
, e1'
) ->
3358 (* references can be "lvalues" in foreach bindings *)
3359 Errors.binding_ref_in_array pref
;
3360 let env, texpr
, ty = assign
p env e1' ty2
in
3361 make_result env (T.Unop
(Ast.Uref
, texpr
)) ty
3363 assign_simple
p ur
env e1 ty2
3365 and assign_simple
pos ur
env e1 ty2
=
3366 let env, te1, ty1 = lvalue
env e1
in
3367 let env, ty2
= TUtils.unresolved
env ty2
in
3368 let env = Type.coerce_type
pos ur
env ty2
ty1 in
3371 and assign_array_append
pos ur
env ty1 ty2
=
3372 let env, ety1
= Env.expand_type
env ty1 in
3374 | r, (Tany
| Tarraykind
(AKany
| AKempty
)) ->
3375 env, (ty1, (r, Typing_utils.tany
env))
3377 env, (ty1, (r, Typing_utils.terr
env))
3378 | _, Tclass
((_, n
), [tv
])
3379 when n
= SN.Collections.cVector
|| n
= SN.Collections.cSet
->
3380 Env.error_if_reactive_context
env begin fun () ->
3381 Errors.nonreactive_append
pos
3383 let env = Type.sub_type
pos ur
env ty2 tv
in
3385 (* Handle the case where Vector or Set was used as a typehint
3386 without type parameters *)
3387 | r, Tclass
((_, n
), [])
3388 when n
= SN.Collections.cVector
|| n
= SN.Collections.cSet
->
3389 Env.error_if_reactive_context
env begin fun () ->
3390 Errors.nonreactive_append
pos
3392 env, (ty1, (r, Typing_utils.tany
env))
3393 | _, Tclass
((_, n
), [tk; tv
]) when n
= SN.Collections.cMap
->
3394 Env.error_if_reactive_context
env begin fun () ->
3395 Errors.nonreactive_append
pos
3398 (Reason.Rmap_append
pos, Tclass
((pos, SN.Collections.cPair
), [tk; tv
])) in
3399 let env = Type.sub_type
pos ur
env ty2
tpair in
3401 (* Handle the case where Map was used as a typehint without
3403 | _, Tclass
((_, n
), []) when n
= SN.Collections.cMap
->
3404 Env.error_if_reactive_context
env begin fun () ->
3405 Errors.nonreactive_append
pos
3408 (Reason.Rmap_append
pos, Tclass
((pos, SN.Collections.cPair
), [])) in
3409 let env = Type.sub_type
pos ur
env ty2
tpair in
3411 | r, Tclass
((_, n
) as id, [tv
])
3412 when n
= SN.Collections.cVec
|| n
= SN.Collections.cKeyset
->
3413 let env, tv'
= U.union env tv ty2
in
3414 env, ((r, Tclass
(id, [tv'
])), tv'
)
3415 | r, Tarraykind
(AKvec tv
) ->
3416 let env, tv'
= U.union env tv ty2
in
3417 env, ((r, Tarraykind
(AKvec tv'
)), tv'
)
3418 | r, Tarraykind
(AKvarray tv
) ->
3419 let env, tv'
= U.union env tv ty2
in
3420 env, ((r, Tarraykind
(AKvarray tv'
)), tv'
)
3421 | r, Tdynamic
-> env, (ty1, (r, Tdynamic
))
3423 if Env.is_strict
env
3424 then error_assign_array_append
env pos ty1
3425 else env, (ty1, (Reason.Rwitness
pos, Typing_utils.tany
env))
3426 | r, Tunresolved ty1l
->
3427 let env, resl = List.map_env
env ty1l
(fun env ty1 -> assign_array_append
pos ur
env ty1 ty2
) in
3428 let (ty1l'
, tyl'
) = List.unzip
resl in
3429 env, ((r, Tunresolved ty1l'
), (r, Tunresolved
tyl'
))
3431 let resl = try_over_concrete_supertypes env ty1 begin fun env ty1 ->
3432 assign_array_append
pos ur
env ty1 ty2
3434 begin match resl with
3436 | _ -> error_assign_array_append
env pos ty1
3438 | _, (Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_ | Tprim
_ | Tvar
_ |
3439 Tfun
_ | Tclass
_ | Ttuple
_ | Tanon
_ | Tshape
_) ->
3440 error_assign_array_append
env pos ty1
3442 and array_field
env = function
3443 | Nast.AFvalue ve
->
3444 let env, tve
, tv
= expr
env ve
in
3445 let env, tv
= Typing_env.unbind
env tv
in
3446 env, (T.AFvalue tve
, None
, tv
)
3447 | Nast.AFkvalue
(ke
, ve
) ->
3448 let env, tke
, tk = expr
env ke
in
3449 let env, tve
, tv
= expr
env ve
in
3450 let env, tv
= Typing_env.unbind
env tv
in
3451 env, (T.AFkvalue
(tke
, tve
), Some
tk, tv
)
3453 and array_value ~
expected env x
=
3454 let env, te, ty = expr ?
expected ~
forbid_uref:true env x
in
3455 let env, ty = Typing_env.unbind
env ty in
3458 and array_field_value ~
expected env = function
3460 | Nast.AFkvalue
(_, x
) ->
3461 array_value ~
expected env x
3463 and array_field_key ~
expected env = function
3464 (* This shouldn't happen *)
3465 | Nast.AFvalue
(p, _) ->
3466 let ty = (Reason.Rwitness
p, Tprim Tint
) in
3467 env, (T.make_typed_expr
p ty T.Any
, ty)
3468 | Nast.AFkvalue
(x
, _) ->
3469 array_value ~
expected env x
3471 and akshape_field
env = function
3472 | Nast.AFkvalue
(k, v
) ->
3473 let env, tek
, tk = expr
env k in
3474 let env, tk = Typing_env.unbind
env tk in
3475 let env, tk = TUtils.unresolved
env tk in
3476 let env, tev
, tv
= expr
env v
in
3477 let env, tv
= Typing_env.unbind
env tv
in
3478 let env, tv
= TUtils.unresolved
env tv
in
3480 match TUtils.shape_field_name
env k with
3481 | Some
field_name -> field_name
3482 | None
-> assert false in (* Typing_arrays.is_shape_like_array
3483 * should have prevented this *)
3484 env, T.AFkvalue
(tek
, tev
), (field_name, (tk, tv
))
3485 | Nast.AFvalue
_ -> assert false (* Typing_arrays.is_shape_like_array
3486 * should have prevented this *)
3488 and aktuple_afvalue
env v
=
3489 let env, tev
, tv
= expr
env v
in
3490 let env, tv
= Typing_env.unbind
env tv
in
3491 let env, ty = TUtils.unresolved
env tv
in
3494 and aktuple_field
env = function
3495 | Nast.AFvalue v
-> aktuple_afvalue
env v
3496 | Nast.AFkvalue
_ -> assert false (* check_consistent_fields
3497 * should have prevented this *)
3498 and check_parent_construct
pos env el uel env_parent
=
3499 let check_not_abstract = false in
3500 let env, env_parent
= Phase.localize_with_self
env env_parent
in
3501 let env, _tcid
, tel
, tuel
, parent
, fty =
3502 new_object ~
expected:None ~check_parent
:true ~
check_not_abstract
3503 ~is_using_clause
:false
3504 pos env CIparent el uel
in
3505 (* Not sure why we need to equate these types *)
3506 let env = Type.sub_type
pos (Reason.URnone
) env env_parent parent
in
3507 let env = Type.sub_type
pos (Reason.URnone
) env parent env_parent
in
3508 env, tel
, tuel
, (Reason.Rwitness
pos, Tprim Tvoid
), parent
, fty
3510 and call_parent_construct
pos env el uel
=
3511 let parent = Env.get_parent
env in
3514 check_parent_construct
pos env el uel
parent
3524 | Tvarray_or_darray
_
3534 ) -> (* continue here *)
3535 let ty = (Reason.Rwitness
pos, Typing_utils.tany
env) in
3536 let default = env, [], [], ty, ty, ty in
3537 match Env.get_self
env with
3538 | _, Tclass
((_, self
), _) ->
3539 (match Env.get_class
env self
with
3540 | Some
({tc_kind
= Ast.Ctrait
; _}
3542 (match trait_most_concrete_req_class trait
env with
3543 | None
-> Errors.parent_in_trait
pos; default
3544 | Some
(_, parent_ty
) ->
3545 check_parent_construct
pos env el uel parent_ty
3548 if not self_tc
.tc_members_fully_known
3549 then () (* Don't know the hierarchy, assume it's correct *)
3550 else Errors.undefined_parent
pos;
3552 | None
-> assert false)
3553 | _, (Terr
| Tany
| Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_
3554 | Tprim
_ | Tfun
_ | Ttuple
_ | Tshape
_ | Tvar
_ | Tdynamic
3555 | Tabstract
(_, _) | Tanon
(_, _) | Tunresolved
_ | Tobject
3557 Errors.parent_outside_class
pos;
3558 let ty = (Reason.Rwitness
pos, Typing_utils.terr
env) in
3559 env, [], [], ty, ty, ty
3561 (* parent::method() in a class definition invokes the specific parent
3562 * version of the method ... it better be callable *)
3563 and check_abstract_parent_meth mname
pos fty =
3564 if is_abstract_ft
fty
3565 then Errors.parent_abstract_call mname
pos (Reason.to_pos
(fst
fty));
3568 and is_abstract_ft
fty = match fty with
3569 | _r, Tfun
{ ft_abstract
= true; _ } -> true
3570 | _r, (Terr
| Tany
| Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_ | Tprim
_
3571 | Tvar
_ | Tfun
_ | Tclass
(_, _) | Tabstract
(_, _) | Ttuple
_
3572 | Tanon
_ | Tunresolved
_ | Tobject
| Tshape
_ | Tdynamic
3576 (* Depending on the kind of expression we are dealing with
3577 * The typing of call is different.
3580 and dispatch_call ~
expected ~is_using_clause ~is_expr_statement
p env call_type
3581 (fpos
, fun_expr
as e) hl el uel ~in_suspend
=
3582 let make_call env te thl tel tuel
ty =
3583 env, T.make_typed_expr
p ty (T.Call
(call_type
, te, thl
, tel
, tuel
)), ty in
3584 (* TODO: Avoid Tany annotations in TAST by eliminating `make_call_special` *)
3585 let make_call_special env id tel
ty =
3586 make_call env (T.make_typed_expr fpos
(Reason.Rnone
, TUtils.tany
env) (T.Id
id)) [] tel
[] ty in
3587 (* For special functions and pseudofunctions with a definition in hhi. *)
3588 let make_call_special_from_def env id tel
ty_ =
3589 let env, fty = fun_type_of_id
env id hl
in
3590 let ty = match fty with
3591 | _, Tfun
ft -> ft.ft_ret
3592 | _ -> (Reason.Rwitness
p, ty_) in
3593 make_call env (T.make_typed_expr fpos
fty (T.Id
id)) [] tel
[] ty in
3594 let overload_function = overload_function make_call fpos
in
3596 let check_coroutine_call env fty =
3597 let () = if is_return_disposable_fun_type env fty && not is_using_clause
3598 then Errors.invalid_new_disposable
p else () in
3600 - Some true if type is definitely a coroutine
3601 - Some false if type is definitely not a coroutine
3602 - None if type is Tunresolved that contains
3603 both coroutine and non-coroutine constituents *)
3604 let rec is_coroutine ty =
3606 | Tfun
{ ft_is_coroutine
= true; _ } ->
3609 Some
(Option.value_map
(Env.get_anonymous
env id) ~
default:false ~f
:(fun (_,b
,_,_,_) -> b
) )
3611 begin match List.map ts ~f
:is_coroutine with
3614 (*if rest of the list has the same value as the first element
3615 return value of the first element or None otherwise*)
3616 if List.for_all xs ~f
:(Option.value_map ~
default:false ~f
:((=)x
))
3623 match in_suspend
, is_coroutine fty with
3625 | false, Some
false -> ()
3627 (* non-coroutine call in suspend *)
3628 Errors.non_coroutine_call_in_suspend
3630 (Reason.to_string
("This is " ^
Typing_print.error
(snd
fty)) (fst
fty));
3632 (*coroutine call outside of suspend *)
3633 Errors.coroutine_call_outside_of_suspend
p; in
3635 let check_function_in_suspend name =
3637 then Errors.function_is_not_coroutine fpos
name in
3639 let check_class_function_in_suspend class_name function_name
=
3640 check_function_in_suspend (class_name ^
"::" ^ function_name
) in
3643 (* Special function `echo` *)
3644 | Id
((p, pseudo_func
) as id) when pseudo_func
= SN.SpecialFunctions.echo
->
3645 check_function_in_suspend SN.SpecialFunctions.echo
;
3646 Env.error_if_shallow_reactive_context
env @@ begin fun () ->
3647 Errors.echo_in_reactive_context
p;
3649 let env, tel
, _ = exprs ~accept_using_var
:true env el
in
3650 make_call_special env id tel
(Reason.Rwitness
p, Tprim Tvoid
)
3651 (* Special function `empty` *)
3652 | Id
((_, pseudo_func
) as id) when pseudo_func
= SN.PseudoFunctions.empty
->
3653 check_function_in_suspend SN.PseudoFunctions.empty
;
3654 let env, tel
, _ = exprs ~accept_using_var
:true env el
in
3656 Errors.unpacking_disallowed_builtin_function
p pseudo_func
;
3657 if Env.is_strict
env then
3658 Errors.empty_in_strict
p;
3659 make_call_special_from_def env id tel
(Tprim Tbool
)
3660 (* Special function `isset` *)
3661 | Id
((_, pseudo_func
) as id) when pseudo_func
= SN.PseudoFunctions.isset
->
3662 check_function_in_suspend SN.PseudoFunctions.isset
;
3663 let env, tel
, _ = exprs ~accept_using_var
:true env el
in
3665 Errors.unpacking_disallowed_builtin_function
p pseudo_func
;
3666 if Env.is_strict
env then
3667 Errors.isset_in_strict
p;
3668 make_call_special_from_def env id tel
(Tprim Tbool
)
3669 (* Special function `unset` *)
3670 | Id
((_, pseudo_func
) as id) when pseudo_func
= SN.PseudoFunctions.unset
->
3671 check_function_in_suspend SN.PseudoFunctions.unset
;
3672 let env, tel
, _ = exprs env el
in
3673 List.iter tel ~f
:(Typing_mutability.check_unset_target
env);
3675 Errors.unpacking_disallowed_builtin_function
p pseudo_func
;
3676 let disallow_varray =
3677 TypecheckerOptions.disallow_unset_on_varray
(Env.get_options
env) in
3678 let unset_error = if disallow_varray then
3679 Errors.unset_nonidx_in_strict_no_varray
3681 Errors.unset_nonidx_in_strict
in
3682 let env = if Env.is_strict
env then
3684 | [(_, Array_get
((_, Class_const
_), Some
_))], [] ->
3685 Errors.const_mutation
p Pos.none
"";
3687 | [(_, Array_get
(ea
, Some
_))], [] ->
3688 let env, _te
, ty = expr
env ea
in
3689 let tany = (Reason.Rnone
, Typing_utils.tany env) in
3690 if List.exists ~f
:(fun super
-> SubType.is_sub_type
env ty super
) [
3691 (Reason.Rnone
, (Tclass
((Pos.none
, SN.Collections.cDict
),
3693 (Reason.Rnone
, (Tclass
((Pos.none
, SN.Collections.cKeyset
),
3695 if disallow_varray then
3696 (Reason.Rnone
, Tarraykind
(AKmap
(tany, tany)))
3697 else (Reason.Rnone
, Tarraykind AKany
);
3700 let env, (r, ety
) = Env.expand_type
env ty in
3703 (Reason.to_string
("This is " ^
Typing_print.error ety
) r);
3706 | _ -> unset_error p []; env)
3709 | [(p, Obj_get
(_, _, OG_nullsafe
))] ->
3711 Errors.nullsafe_property_write_context
p;
3712 make_call_special_from_def env id tel
(TUtils.terr
env)
3715 make_call_special_from_def env id tel
(Tprim Tvoid
))
3716 (* Special function `freeze` *)
3717 | Id
((_, freeze
) as id) when freeze
= SN.Rx.freeze
->
3718 check_function_in_suspend SN.Rx.freeze
;
3719 let env, tel
, _ = exprs env el
in
3721 Errors.unpacking_disallowed_builtin_function
p freeze
;
3722 if not
(Env.env_local_reactive
env) then
3723 Errors.freeze_in_nonreactive_context
p;
3724 let env = Typing_mutability.freeze_local
p env tel
in
3725 make_call_special_from_def env id tel
(Tprim Tvoid
)
3726 (* Pseudo-function `get_called_class` *)
3727 | Id
(_, get_called_class
) when
3728 get_called_class
= SN.StdlibFunctions.get_called_class
3729 && el
= [] && uel
= [] ->
3730 check_function_in_suspend SN.StdlibFunctions.get_called_class
;
3731 (* get_called_class fetches the late-bound class *)
3732 if Env.is_outside_class
env then Errors.static_outside_class
p;
3733 class_const
env p ((p, CIstatic
), (p, SN.Members.mClass
))
3734 (* Special function `array_filter` *)
3735 | Id
((_, array_filter
) as id)
3736 when array_filter
= SN.StdlibFunctions.array_filter
&& el
<> [] && uel
= [] ->
3737 check_function_in_suspend SN.StdlibFunctions.array_filter
;
3738 (* dispatch the call to typecheck the arguments *)
3739 let env, fty = fun_type_of_id
env id hl
in
3740 let env, tel
, tuel
, res
= call ~
expected p env fty el uel
in
3741 (* but ignore the result and overwrite it with custom return type *)
3742 let x = List.hd_exn el
in
3743 let env, _tx
, ty = expr
env x in
3744 let explain_array_filter (r, t
) =
3745 (Reason.Rarray_filter
(p, r), t
) in
3746 let get_value_type env tv
=
3748 if List.length el
> 1
3750 else TUtils.non_null
env tv
in
3751 env, explain_array_filter tv
in
3752 let rec get_array_filter_return_type env ty =
3753 let env, ety
= Env.expand_type
env ty in
3755 | (_, Tarraykind
(AKany
| AKempty
)) as array_type
->
3757 | (_, Tarraykind
(AKtuple
_)) ->
3758 let env, ty = Typing_arrays.downcast_aktypes
env ty in
3759 get_array_filter_return_type env ty
3760 | (r, Tarraykind
(AKvec tv
| AKvarray tv
)) ->
3761 let env, tv
= get_value_type env tv
in
3762 env, (r, Tarraykind
(AKvec tv
))
3763 | (r, Tunresolved
x) ->
3764 let env, x = List.map_env
env x get_array_filter_return_type in
3765 env, (r, Tunresolved
x)
3767 env, (r, Typing_utils.tany env)
3769 env, (r, Typing_utils.terr
env)
3771 let tk, tv
= Env.fresh_type
(), Env.fresh_type
() in
3774 let keyed_container = (
3777 (Pos.none
, SN.Collections.cKeyedContainer
), [tk; tv
]
3780 let env = SubType.sub_type
env ety
keyed_container in
3781 let env, tv
= get_value_type env tv
in
3782 env, (r, Tarraykind
(AKmap
(
3783 (explain_array_filter tk),
3786 (fun _ -> Errors.try_
3791 (Pos.none
, SN.Collections.cContainer
), [tv
]
3794 let env = SubType.sub_type
env ety
container in
3795 let env, tv
= get_value_type env tv
in
3796 env, (r, Tarraykind
(AKmap
(
3797 (explain_array_filter (r, Tprim Tarraykey
)),
3799 (fun _ -> env, res
)))
3800 in let env, rty = get_array_filter_return_type env ty in
3803 | r, Tfun
ft -> r, Tfun
{ft with ft_ret
= rty}
3805 make_call env (T.make_typed_expr fpos
fty (T.Id
id)) hl tel tuel
rty
3806 (* Special function `type_structure` *)
3807 | Id
(p, type_structure
)
3808 when type_structure
= SN.StdlibFunctions.type_structure
3809 && (List.length el
= 2) && uel
= [] ->
3810 check_function_in_suspend SN.StdlibFunctions.type_structure
;
3814 | p, Nast.String cst
->
3815 (* find the class constant implicitly defined by the typeconst *)
3816 let cid = (match e1
with
3817 | _, Class_const
(cid, (_, x))
3818 | _, Class_get
(cid, (_, x)) when x = SN.Members.mClass
-> cid
3819 | _ -> (fst e1
, Nast.CIexpr e1
)) in
3820 class_const ~incl_tc
:true env p (cid, (p, cst
))
3822 Errors.illegal_type_structure
p "second argument is not a string";
3823 expr_error env p (Reason.Rwitness
p))
3824 | _ -> assert false)
3825 (* Special function `array_map` *)
3826 | Id
((_, array_map
) as x)
3827 when array_map
= SN.StdlibFunctions.array_map
&& el
<> [] && uel
= [] ->
3828 check_function_in_suspend SN.StdlibFunctions.array_map
;
3829 let env, fty = fun_type_of_id
env x [] in
3830 let env, fty = Env.expand_type
env fty in
3831 let env, fty = match fty, el
with
3832 | ((r_fty
, Tfun
fty), _::args
) when args
<> [] ->
3833 let arity = List.length args
in
3835 Builds a function with signature:
3837 function<T1, ..., Tn, Tr>(
3838 (function(T1, ..., Tn):Tr),
3844 where R is constructed by build_output_container applied to Tr
3846 let build_function env build_output_container
=
3848 (* If T1, ... Tn, Tr are provided explicitly, instantiate the function parameters with
3849 * those directly. *)
3850 if List.length hl
= 0
3852 let env, tr
= Env.fresh_unresolved_type
env in
3853 let env, vars
= List.map_env
env args
3854 ~f
:(fun env _ -> Env.fresh_unresolved_type
env) in
3856 else if List.length hl
<> List.length args
+ 1 then begin
3857 let env, tr
= Env.fresh_unresolved_type
env in
3858 Errors.expected_tparam ~use_pos
:fpos ~definition_pos
:fty.ft_pos
3859 (1 + (List.length args
));
3860 let env, vars
= List.map_env
env args
3861 ~f
:(fun env _ -> Env.fresh_unresolved_type
env) in
3864 let env, vars_and_tr
= List.map_env
env hl
Phase.localize_hint_with_self
in
3865 let vars, trl
= List.split_n vars_and_tr
(List.length vars_and_tr
- 1) in
3866 (* Since we split the arguments and return type at the last index and the length is
3867 non-zero this is safe. *)
3868 let tr = List.hd_exn trl
in
3871 let f = TUtils.default_fun_param
(
3874 ft_pos
= fty.ft_pos
;
3875 ft_deprecated
= None
;
3876 ft_abstract
= false;
3877 ft_is_coroutine
= false;
3878 ft_arity
= Fstandard
(arity, arity);
3880 ft_where_constraints
= [];
3881 ft_params
= List.map
vars TUtils.default_fun_param
;
3883 ft_ret_by_ref
= fty.ft_ret_by_ref
;
3884 ft_reactive
= fty.ft_reactive
;
3885 ft_mutability
= fty.ft_mutability
;
3886 ft_returns_mutable
= fty.ft_returns_mutable
;
3887 ft_return_disposable
= fty.ft_return_disposable
;
3888 ft_decl_errors
= None
;
3889 ft_returns_void_to_rx
= fty.ft_returns_void_to_rx
;
3892 let containers = List.map
vars (fun var
->
3893 let tc = Tclass
((fty.ft_pos
, SN.Collections.cContainer
), [var
]) in
3894 TUtils.default_fun_param
(r_fty
, tc)
3896 env, (r_fty
, Tfun
{fty with
3897 ft_arity
= Fstandard
(arity+1, arity+1);
3898 ft_params
= f::containers;
3899 ft_ret
= build_output_container
tr;
3904 Takes a Container type and returns a function that can "pack" a type
3905 into an array of appropriate shape, preserving the key type, i.e.:
3906 array -> f, where f R = array
3907 array<X> -> f, where f R = array<R>
3908 array<X, Y> -> f, where f R = array<X, R>
3909 Vector<X> -> f where f R = array<R>
3910 KeyedContainer<X, Y> -> f, where f R = array<X, R>
3911 Container<X> -> f, where f R = array<arraykey, R>
3912 X -> f, where f R = Y
3914 let rec build_output_container
3915 (env:Env.env) (x:locl
ty) : (Env.env * (locl
ty -> locl
ty)) =
3916 let env, x = Env.expand_type
env x in (match x with
3917 | (_, Tarraykind
(AKany
| AKempty
)) as array_type
->
3918 env, (fun _ -> array_type
)
3919 | (_, Tarraykind
(AKtuple
_ )) ->
3920 let env, x = Typing_arrays.downcast_aktypes
env x in
3921 build_output_container env x
3922 | (r, Tarraykind
(AKvec
_ | AKvarray
_)) ->
3923 env, (fun tr -> (r, Tarraykind
(AKvec
(tr))) )
3925 env, (fun _ -> (r, Typing_utils.tany env))
3927 env, (fun _ -> (r, Typing_utils.terr
env))
3928 | (r, Tunresolved
x) ->
3929 let env, x = List.map_env
env x build_output_container in
3930 env, (fun tr -> (r, Tunresolved
(List.map
x (fun f -> f tr))))
3932 let tk, tv
= Env.fresh_type
(), Env.fresh_type
() in
3933 let try_vector env =
3937 (fty.ft_pos
, SN.Collections.cConstVector
), [tv
]
3940 let env = SubType.sub_type
env x vector in
3941 env, (fun tr -> (r, Tarraykind
(
3944 let try_keyed_container env =
3945 let keyed_container = (
3948 (fty.ft_pos
, SN.Collections.cKeyedContainer
), [tk; tv
]
3951 let env = SubType.sub_type
env x keyed_container in
3952 env, (fun tr -> (r, Tarraykind
(AKmap
(
3956 let try_container env =
3960 (fty.ft_pos
, SN.Collections.cContainer
), [tv
]
3963 let env = SubType.sub_type
env x container in
3964 env, (fun tr -> (r, Tarraykind
(AKmap
(
3965 (r, Tprim Tarraykey
),
3970 (fun _ -> Errors.try_
3972 try_keyed_container env)
3973 (fun _ -> Errors.try_
3976 (fun _ -> env, (fun _ -> (Reason.Rwitness
p, Typing_utils.tany env)))))) in
3978 Single argument calls preserve the key type, multi argument
3979 calls always return an array<Tr>
3983 let env, _tx
, x = expr
env x in
3984 let env, output_container
= build_output_container env x in
3985 build_function env output_container
3987 build_function env (fun tr ->
3988 (r_fty
, Tarraykind
(AKvec
(tr)))))
3990 let env, tel
, tuel
, ty = call ~
expected p env fty el
[] in
3991 make_call env (T.make_typed_expr fpos
fty (T.Id
x)) hl tel tuel
ty
3992 (* Special function `idx` *)
3993 | Id
((_, idx
) as id) when idx
= SN.FB.idx
->
3994 check_function_in_suspend SN.FB.idx
;
3995 (* Directly call get_fun so that we can muck with the type before
3996 * instantiation -- much easier to work in terms of Tgeneric Tk/Tv than
3997 * trying to figure out which Tvar is which. *)
3998 (match Env.get_fun
env (snd
id) with
4000 let param1, param2
, param3
=
4001 match fty.ft_params
with
4002 | [param1; param2
; param3
] -> param1, param2
, param3
4003 | _ -> assert false in
4004 let { fp_type
= (r2
, _); _ } = param2
in
4005 let { fp_type
= (r3
, _); _ } = param3
in
4006 let params, ret = match List.length el
with
4008 let ty1 = match param1.fp_type
with
4009 | (r11
, Toption
(r12
, Tapply
(coll
, [tk; (r13
, _) as tv
]))) ->
4010 (r11
, Toption
(r12
, Tapply
(coll
, [tk; (r13
, Toption tv
)])))
4011 | _ -> assert false in
4012 let param1 = { param1 with fp_type
= ty1 } in
4013 let ty2 = (r2
, Toption
(r2
, Tgeneric
"Tk")) in
4014 let param2 = { param2 with fp_type
= ty2 } in
4015 let rret = fst
fty.ft_ret
in
4016 let ret = (rret, Toption
(rret, Tgeneric
"Tv")) in
4017 [param1; param2], ret
4019 let param2 = { param2 with fp_type
= (r2
, Tgeneric
"Tk") } in
4020 let param3 = { param3 with fp_type
= (r3
, Tgeneric
"Tv") } in
4021 let ret = (fst
fty.ft_ret
, Tgeneric
"Tv") in
4022 [param1; param2; param3], ret
4023 | _ -> fty.ft_params
, fty.ft_ret
in
4024 let fty = { fty with ft_params
= params; ft_ret
= ret } in
4025 let ety_env = Phase.env_with_self
env in
4026 let env, fty = Phase.localize_ft ~use_pos
:p ~
ety_env env fty in
4027 let tfun = Reason.Rwitness
fty.ft_pos
, Tfun
fty in
4028 let env, tel
, _tuel
, ty = call ~
expected p env tfun el
[] in
4029 let env, ty = match ty with
4031 let env, ty = TUtils.non_null
env ty in
4032 env, (r, Toption
ty)
4034 make_call env (T.make_typed_expr fpos
tfun (T.Id
id)) [] tel
[] ty
4035 | None
-> unbound_name env id)
4037 (* Special function `Shapes::idx` *)
4038 | Class_const
((_, CI
((_, shapes
), _)) as class_id
, ((_, idx
) as method_id
))
4039 when shapes
= SN.Shapes.cShapes
&& idx
= SN.Shapes.idx
->
4040 check_class_function_in_suspend SN.Shapes.cShapes
SN.Shapes.idx
;
4041 overload_function p env class_id method_id el uel
4042 begin fun env fty res el
-> match el
with
4044 let env, _ts
, shape_ty
= expr
env shape
in
4045 Typing_shapes.idx
env p fty shape_ty field None
4046 | [shape
; field
; default] ->
4047 let env, _ts
, shape_ty
= expr
env shape
in
4048 let env, _td
, default_ty
= expr
env default in
4049 Typing_shapes.idx
env p fty shape_ty field
4050 (Some
((fst
default), default_ty
))
4053 (* Special function `Shapes::keyExists` *)
4054 | Class_const
((_, CI
((_, shapes
), _)) as class_id
, ((_, key_exists
) as method_id
))
4055 when shapes
= SN.Shapes.cShapes
&& key_exists
= SN.Shapes.keyExists
->
4056 check_class_function_in_suspend SN.Shapes.cShapes
SN.Shapes.keyExists
;
4057 overload_function p env class_id method_id el uel
4058 begin fun env fty res el
-> match el
with
4060 let env, _te
, shape_ty
= expr
env shape
in
4061 (* try accessing the field, to verify existence, but ignore
4062 * the returned type and keep the one coming from function
4063 * return type hint *)
4064 let env, _ = Typing_shapes.idx
env p fty shape_ty field None
in
4068 (* Special function `Shapes::removeKey` *)
4069 | Class_const
((_, CI
((_, shapes
), _)) as class_id
, ((_, remove_key
) as method_id
))
4070 when shapes
= SN.Shapes.cShapes
&& remove_key
= SN.Shapes.removeKey
->
4071 check_class_function_in_suspend SN.Shapes.cShapes
SN.Shapes.removeKey
;
4072 overload_function p env class_id method_id el uel
4073 begin fun env _ res el
-> match el
with
4074 | [shape
; field
] -> begin match shape
with
4075 | (_, Lvar
(_, lvar
))
4076 | (_, Callconv
(Ast.Pinout
, (_, Lvar
(_, lvar
))))
4077 | (_, Unop
(Ast.Uref
, (_, Lvar
(_, lvar
)))) ->
4078 let env, _te
, shape_ty
= expr ~is_func_arg
:true env shape
in
4080 Typing_shapes.remove_key
p env shape_ty field
in
4081 let env, _ = set_valid_rvalue
p env lvar shape_ty
in
4084 Errors.invalid_shape_remove_key
(fst shape
);
4089 (* Special function `Shapes::toArray` *)
4090 | Class_const
((_, CI
((_, shapes
), _)) as class_id
, ((_, to_array
) as method_id
))
4091 when shapes
= SN.Shapes.cShapes
&& to_array
= SN.Shapes.toArray
->
4092 check_class_function_in_suspend SN.Shapes.cShapes
SN.Shapes.toArray
;
4093 overload_function p env class_id method_id el uel
4094 begin fun env _ res el
-> match el
with
4096 let env, _te
, shape_ty
= expr
env shape
in
4097 Typing_shapes.to_array
env shape_ty res
4101 (* Special function `Shapes::toDict` *)
4102 | Class_const
((_, CI
((_, shapes
), _)) as class_id
, ((_, to_array
) as method_id
))
4103 when shapes
= SN.Shapes.cShapes
&& to_array
= SN.Shapes.toDict
->
4104 check_class_function_in_suspend SN.Shapes.cShapes
SN.Shapes.toDict
;
4105 overload_function p env class_id method_id el uel
4106 begin fun env _ res el
-> match el
with
4108 let env, _te
, shape_ty
= expr
env shape
in
4109 Typing_shapes.to_dict
env shape_ty res
4113 (* Special function `parent::__construct` *)
4114 | Class_const
((pos, CIparent
), ((_, construct
) as id))
4115 when construct
= SN.Members.__construct
->
4116 check_class_function_in_suspend "parent" SN.Members.__construct
;
4117 let env, tel
, tuel
, ty, pty
, ctor_fty =
4118 call_parent_construct
p env el uel
in
4119 make_call env (T.make_typed_expr fpos
ctor_fty
4120 (T.Class_const
(((pos, pty
), T.CIparent
), id))) hl tel tuel
ty
4122 (* Calling parent method *)
4123 | Class_const
((pos, CIparent
), m
) ->
4124 let env, tcid
, ty1 = static_class_id ~check_constraints
:false pos env CIparent
in
4125 if Env.is_static
env
4127 (* in static context, you can only call parent::foo() on static
4130 class_get ~is_method
:true ~is_const
:false ~explicit_tparams
:hl
env ty1 m CIparent
in
4131 let fty = check_abstract_parent_meth
(snd m
) p fty in
4132 check_coroutine_call env fty;
4133 let env, tel
, tuel
, ty =
4134 call ~
expected ~is_expr_statement
4135 ~method_call_info
:(TR.make_call_info ~receiver_is_self
:false
4136 ~is_static
:true (Reason.Rwitness fpos
, TUtils.this_of
(Env.get_self
env)) (snd m
))
4138 make_call env (T.make_typed_expr fpos
fty
4139 (T.Class_const
(tcid
, m
))) hl tel tuel
ty
4142 (* in instance context, you can call parent:foo() on static
4143 * methods as well as instance methods *)
4144 if not
(class_contains_smethod
env ty1 m
)
4146 (* parent::nonStaticFunc() is really weird. It's calling a method
4147 * defined on the parent class, but $this is still the child class.
4148 * We can deal with this by hijacking the continuation that
4149 * calculates the SN.Typehints.this type *)
4150 let env, this_ty
= ExprDepTy.make
env CIstatic
4151 (Reason.Rwitness fpos
, TUtils.this_of
(Env.get_self
env)) in
4152 let k_lhs _ = this_ty
in
4153 let env, method_
, _ =
4154 obj_get_ ~is_method
:true ~
nullsafe:None ~pos_params
:(Some el
) ~
valkind:`other
env ty1
4156 begin fun (env, fty, _) ->
4157 let fty = check_abstract_parent_meth
(snd m
) p fty in
4158 check_coroutine_call env fty;
4159 let env, _tel
, _tuel
, method_
= call ~
expected
4160 ~method_call_info
:(TR.make_call_info ~receiver_is_self
:false
4161 ~is_static
:false this_ty
(snd m
))
4167 make_call env (T.make_typed_expr fpos this_ty
4168 (T.Class_const
(tcid
, m
))) hl
[] [] method_
4171 class_get ~is_method
:true ~is_const
:false ~explicit_tparams
:hl
env ty1 m CIparent
in
4172 let fty = check_abstract_parent_meth
(snd m
) p fty in
4173 check_coroutine_call env fty;
4174 let env, tel
, tuel
, ty =
4176 ~method_call_info
:(TR.make_call_info ~receiver_is_self
:false
4177 ~is_static
:true (Reason.Rwitness fpos
, TUtils.this_of
(Env.get_self
env)) (snd m
))
4179 make_call env (T.make_typed_expr fpos
fty
4180 (T.Class_const
(tcid
, m
))) hl tel tuel
ty
4182 (* Call class method *)
4183 | Class_const
((pid
, e1
), m
) ->
4184 let env, te1, ty1 = static_class_id ~check_constraints
:true pid
env e1
in
4186 class_get ~is_method
:true ~is_const
:false ~explicit_tparams
:hl
4187 ~pos_params
:el
env ty1 m e1
in
4188 let () = match e1
with
4189 | CIself
when is_abstract_ft
fty ->
4190 begin match Env.get_self
env with
4191 | _, Tclass
((_, self
), _) ->
4192 (* at runtime, self:: in a trait is a call to whatever
4193 * self:: is in the context of the non-trait "use"-ing
4194 * the trait's code *)
4195 begin match Env.get_class
env self
with
4196 | Some
{ tc_kind
= Ast.Ctrait
; _ } -> ()
4197 | _ -> Errors.self_abstract_call
(snd m
) p (Reason.to_pos
(fst
fty))
4201 | CI
(c, _) when is_abstract_ft
fty ->
4202 Errors.classname_abstract_call
(snd
c) (snd m
) p (Reason.to_pos
(fst
fty))
4203 | CI
((_, classname
), _) ->
4204 begin match Typing_heap.Classes.get classname
with
4206 let (_, method_name
) = m
in
4207 begin match SMap.get method_name class_def
.tc_smethods
with
4210 if elt
.ce_synthesized
then
4211 Errors.static_synthetic_method classname
(snd m
) p (Reason.to_pos
(fst
fty))
4214 (* This technically should be an error, but if we throw here we'll break a ton of our
4215 tests since they reference classes that only exist in www, and any missing classes will
4216 get caught elsewhere in the pipeline. *)
4220 check_coroutine_call env fty;
4221 let env, tel
, tuel
, ty =
4223 ~method_call_info
:(TR.make_call_info ~receiver_is_self
:(e1
= CIself
)
4224 ~is_static
:true ty1 (snd m
))
4225 ~is_expr_statement
p env fty el uel
in
4226 make_call env (T.make_typed_expr fpos
fty
4227 (T.Class_const
(te1, m
))) hl tel tuel
ty
4228 (* <<__PPL>>: sample, factor, observe, condition *)
4229 | Id
(pos, id) when env.Env.inside_ppl_class
&& SN.PPLFunctions.is_reserved
id ->
4230 let m = (pos, String_utils.lstrip
id "\\") in
4231 (* Mock these as type equivalent to \Infer -> sample... *)
4232 let infer_e = CI
((p, "\\Infer"), []) in
4233 let env, _, ty1 = static_class_id ~check_constraints
:true p env infer_e in
4234 let nullsafe = None
in
4235 let tel = ref [] and tuel
= ref [] and tftyl
= ref [] in
4236 let fn = (fun (env, fty, _) ->
4237 let env, tel_
, tuel_
, method_
=
4240 ~method_call_info
:(TR.make_call_info ~receiver_is_self
:false
4241 ~is_static
:false ty1 (snd
m))
4243 tel := tel_
; tuel
:= tuel_
;
4244 tftyl
:= fty :: !tftyl
;
4245 env, method_
, None
) in
4246 let env, ty = obj_get ~is_method
:true ~
nullsafe ~pos_params
:el
4247 ~explicit_tparams
:hl
env ty1 infer_e m fn in
4251 | tftyl
-> (Reason.none
, Tunresolved tftyl
)
4253 make_call env (T.make_typed_expr fpos
tfty (T.Fun_id
m)) hl
!tel !tuel
ty
4255 (* Call instance method *)
4256 | Obj_get
(e1
, (pos_id
, Id
m), nullflavor
) ->
4257 let is_method = call_type
= Cnormal
in
4258 let env, te1, ty1 = expr ~accept_using_var
:true env e1
in
4260 (match nullflavor
with
4261 | OG_nullthrows
-> None
4262 | OG_nullsafe
-> Some
p
4264 let tel = ref [] and tuel
= ref [] and tftyl
= ref [] in
4265 let k = (fun (env, fty, _) ->
4266 check_coroutine_call env fty;
4267 let env, tel_
, tuel_
, method_
=
4269 ~method_call_info
:(TR.make_call_info ~receiver_is_self
:false
4270 ~is_static
:false ty1 (snd
m))
4271 ~is_expr_statement
p env fty el uel
in
4272 tel := tel_
; tuel
:= tuel_
;
4273 tftyl
:= fty :: !tftyl
;
4274 env, method_
, None
) in
4275 let env, ty = obj_get ~
is_method ~
nullsafe ~pos_params
:el
4276 ~explicit_tparams
:hl
env ty1 (CIexpr e1
) m k in
4280 | tftyl
-> (Reason.none
, Tunresolved tftyl
)
4282 make_call env (T.make_typed_expr fpos
tfty (T.Obj_get
(te1,
4283 T.make_typed_expr pos_id
tfty (T.Id
m), nullflavor
))) hl
!tel !tuel
ty
4285 (* Function invocation *)
4287 let env, fty = fun_type_of_id
env x hl
in
4288 check_coroutine_call env fty;
4289 let env, tel, tuel
, ty =
4290 call ~
expected ~is_expr_statement
p env fty el uel
in
4291 make_call env (T.make_typed_expr fpos
fty (T.Fun_id
x)) hl
tel tuel
ty
4292 | Id
(_, id as x) ->
4293 let env, fty = fun_type_of_id
env x hl
in
4294 check_coroutine_call env fty;
4295 let env, tel, tuel
, ty =
4296 call ~
expected ~is_expr_statement
p env fty el uel
in
4297 if id = SN.Rx.mutable_
then begin
4298 Typing_mutability.check_rx_mutable_arguments
p env tel;
4299 if not
(Env.env_local_reactive
env) then
4300 Errors.mutable_in_nonreactive_context
p;
4302 make_call env (T.make_typed_expr fpos
fty (T.Id
x)) hl
tel tuel
ty
4304 let env, te, fty = expr
env e in
4305 check_coroutine_call env fty;
4306 let env, tel, tuel
, ty =
4307 call ~
expected ~is_expr_statement
p env fty el uel
in
4308 make_call env te hl
tel tuel
ty
4310 and fun_type_of_id
env x hl
=
4312 match Env.get_fun
env (snd
x) with
4313 | None
-> let env, _, ty = unbound_name env x in env, ty
4315 let ety_env = Phase.env_with_self
env in
4316 let env, fty = Phase.localize_ft ~use_pos
:(fst
x) ~explicit_tparams
:hl ~
ety_env env fty in
4317 env, (Reason.Rwitness
fty.ft_pos
, Tfun
fty)
4321 (*****************************************************************************)
4322 (* Function type-checking expressions accessing an array (example: $x[...]).
4323 * The parameter is_lvalue is true when the expression is on the left hand
4324 * side of an assignment (example: $x[...] = 0).
4326 (*****************************************************************************)
4327 and array_get ?
(lhs_of_null_coalesce
=false) is_lvalue p env ty1 e2
ty2 =
4328 (* This is a little weird -- we enforce the right arity when you use certain
4329 * collections, even in partial mode (where normally completely omitting the
4330 * type parameter list is admitted). Basically the "omit type parameter"
4331 * hole was for compatibility with certain interfaces like ArrayAccess, not
4332 * for collections! But it's hard to go back on now, so since we've always
4333 * errored (with an inscrutable error message) when you try to actually use
4334 * a collection with omitted type parameters, we can continue to error and
4335 * give a more useful error message. *)
4336 let env, ety1
= Env.expand_type
env ty1 in
4337 let arity_error (_, name) =
4338 Errors.array_get_arity
p name (Reason.to_pos
(fst ety1
)) in
4339 let nullable_container_get ty =
4340 if lhs_of_null_coalesce
4341 (* Normally, we would not allow indexing into a nullable container,
4342 however, because the pattern shows up so frequently, we are allowing
4343 indexing into a nullable container as long as it is on the lhs of a
4346 array_get ~lhs_of_null_coalesce
is_lvalue p env ty e2
ty2
4348 Errors.null_container
p
4350 "This is what makes me believe it can be null"
4353 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4355 let type_index env p ty_have ty_expect
reason =
4356 (* coerce if possible *)
4357 match Typing_coercion.try_coerce
p reason env ty_have ty_expect
with
4360 (* if subtype of dynamic, allow it to be used *)
4361 if SubType.is_sub_type
env ty_have
(fst ty_have
, Tdynamic
)
4363 (* fail with useful error *)
4364 else Typing_ops.sub_type
p reason env ty_have ty_expect
4367 | Tunresolved
tyl ->
4368 let env, tyl = List.map_env
env tyl begin fun env ty1 ->
4369 array_get ~lhs_of_null_coalesce
is_lvalue p env ty1 e2
ty2
4371 env, (fst ety1
, Tunresolved
tyl)
4372 | Tarraykind
(AKvarray
ty | AKvec
ty) ->
4373 let ty1 = Reason.Ridx
(fst e2
, fst ety1
), Tprim Tint
in
4374 let env = type_index env p ty2 ty1 Reason.index_array
in
4376 | Tarraykind
(AKvarray_or_darray
ty) ->
4377 let ty1 = Reason.Rvarray_or_darray_key
p, Tprim Tarraykey
in
4378 let env = type_index env p ty2 ty1 Reason.index_array
in
4380 | Tclass
((_, cn
) as id, argl
)
4381 when cn
= SN.Collections.cVector
4382 || cn
= SN.Collections.cVec
->
4383 let ty = match argl
with
4385 | _ -> arity_error id; err_witness env p in
4386 let ty1 = Reason.Ridx_vector
(fst e2
), Tprim Tint
in
4387 let env = type_index env p ty2 ty1 (Reason.index_class cn
) in
4389 | Tclass
((_, cn
) as id, argl
)
4390 when cn
= SN.Collections.cMap
4391 || cn
= SN.Collections.cStableMap
4392 || cn
= SN.Collections.cDict
4393 || cn
= SN.Collections.cKeyset
->
4394 if cn
= SN.Collections.cKeyset
&& is_lvalue then begin
4395 Errors.keyset_set
p (Reason.to_pos
(fst ety1
));
4396 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4398 let (k, v
) = match argl
with
4399 | [t
] when cn
= SN.Collections.cKeyset
-> (t
, t
)
4400 | [k; v
] when cn
<> SN.Collections.cKeyset
-> (k, v
)
4403 let any = err_witness env p in
4406 let env, ty2 = Env.unbind
env ty2 in
4407 let env = type_index env p ty2 k (Reason.index_class cn
) in
4409 (* Certain container/collection types are intended to be immutable/const,
4410 * thus they should never appear as a lvalue when indexing i.e.
4412 * $x[0] = 100; // ERROR
4415 | Tclass
((_, cn
) as id, argl
)
4416 when cn
= SN.Collections.cConstMap
4417 || cn
= SN.Collections.cImmMap
4418 || cn
= SN.Collections.cIndexish
4419 || cn
= SN.Collections.cKeyedContainer
->
4421 error_const_mutation
env p ety1
4423 let (k, v
) = match argl
with
4427 let any = err_witness env p in
4430 let env = type_index env p ty2 k (Reason.index_class cn
) in
4432 | Tclass
((_, cn
) as id, argl
)
4433 when not
is_lvalue &&
4434 (cn
= SN.Collections.cConstVector
|| cn
= SN.Collections.cImmVector
) ->
4435 let ty = match argl
with
4437 | _ -> arity_error id; err_witness env p in
4438 let ty1 = Reason.Ridx
(fst e2
, fst ety1
), Tprim Tint
in
4439 let env = type_index env p ty2 ty1 (Reason.index_class cn
) in
4441 | Tclass
((_, cn
), _)
4443 (cn
= SN.Collections.cConstVector
|| cn
= SN.Collections.cImmVector
) ->
4444 error_const_mutation
env p ety1
4445 | Tarraykind
(AKdarray
(k, v
) | AKmap
(k, v
)) ->
4446 let env, ty2 = Env.unbind
env ty2 in
4447 let env = type_index env p ty2 k Reason.index_array
in
4449 | Tarraykind
((AKshape
_ | AKtuple
_) as akind
) ->
4450 let key = Typing_arrays.static_array_access
env (Some e2
) in
4451 let env, result
= match key, akind
with
4452 | Typing_arrays.AKtuple_index index
, AKtuple fields
->
4453 begin match IMap.get index fields
with
4455 let ty1 = Reason.Ridx
(fst e2
, fst ety1
), Tprim Tint
in
4456 let env = type_index env p ty2 ty1 Reason.index_array
in
4460 | Typing_arrays.AKshape_key
field_name, AKshape fdm
->
4461 begin match Nast.ShapeMap.get
field_name fdm
with
4463 let env, ty2 = Env.unbind
env ty2 in
4464 let env = type_index env p ty2 k Reason.index_array
in
4469 begin match result
with
4470 | Some
ty -> env, ty
4472 (* Key is dynamic, or static and not in the array - treat it as
4473 regular map or vec like array *)
4474 let env, ty1 = Typing_arrays.downcast_aktypes
env ety1
in
4475 array_get
is_lvalue p env ty1 e2
ty2
4477 | Terr
-> env, (Reason.Rwitness
p, Typing_utils.terr
env)
4478 | Tdynamic
-> env, ety1
4479 | Tany
| Tarraykind
(AKany
| AKempty
) ->
4480 env, (Reason.Rnone
, Typing_utils.tany env)
4482 let ty = Reason.Rwitness
p, Tprim Tstring
in
4483 let ty1 = Reason.Ridx
(fst e2
, fst ety1
), Tprim Tint
in
4484 let env = type_index env p ty2 ty1 Reason.index_array
in
4487 (* requires integer literal *)
4491 let idx = int_of_string n
in
4492 let nth = List.nth_exn
tyl idx in
4495 Errors.typing_error
p (Reason.string_of_ureason
Reason.index_tuple
);
4496 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4499 Errors.typing_error
p (Reason.string_of_ureason
Reason.URtuple_access
);
4500 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4502 | Tclass
((_, cn
) as id, argl
) when cn
= SN.Collections.cPair
->
4503 let (ty1, ty2) = match argl
with
4504 | [ty1; ty2] -> (ty1, ty2)
4507 let any = err_witness env p in
4509 in (* requires integer literal *)
4513 let idx = int_of_string n
in
4514 let nth = List.nth_exn
[ty1; ty2] idx in
4517 Errors.typing_error
p @@
4518 Reason.string_of_ureason
(Reason.index_class cn
);
4519 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4522 Errors.typing_error
p (Reason.string_of_ureason
Reason.URpair_access
);
4523 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4525 | Tshape
(_, fdm
) ->
4527 (match TUtils.shape_field_name
env e2
with
4529 (* there was already an error in shape_field name,
4530 don't report another one for a missing field *)
4531 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4532 | Some field
-> (match ShapeMap.get field fdm
with
4534 Errors.undefined_field
4536 ~
name:(TUtils.get_printable_shape_field_name field
)
4537 ~shape_type_pos
:(Reason.to_pos
(fst ety1
));
4538 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4539 | Some
{ sft_optional
= true; _ }
4540 when not
is_lvalue && not lhs_of_null_coalesce
->
4541 let declared_field =
4543 ~
f:(fun x -> Ast.ShapeField.compare field
x = 0)
4544 (ShapeMap.keys fdm
) in
4545 let declaration_pos = match declared_field with
4546 | Ast.SFlit_int
(p, _) | Ast.SFlit_str
(p, _) | Ast.SFclass_const
((p, _), _) -> p in
4547 Errors.array_get_with_optional_field
4550 (TUtils.get_printable_shape_field_name field
);
4551 env, (Reason.Rwitness
p, Typing_utils.terr
env)
4552 | Some
{ sft_optional
= _; sft_ty
} -> env, sft_ty
)
4554 | Toption
ty -> nullable_container_get ty
4555 | Tprim
Nast.Tvoid
->
4556 nullable_container_get (Reason.Rnone
, Tany
)
4558 if Env.is_strict
env
4559 then error_array
env p ety1
4560 else env, (Reason.Rwitness
p, Typing_utils.tany env)
4561 | Tabstract
(AKnewtype
(ts
, [ty]), Some
(r, Tshape
(fk
, fields
)))
4562 when ts
= SN.FB.cTypeStructure
->
4563 let env, fields
= TS.transform_shapemap
env ty fields
in
4564 let ty = r, Tshape
(fk
, fields
) in
4565 array_get ~lhs_of_null_coalesce
is_lvalue p env ty e2
ty2
4568 try_over_concrete_supertypes env ety1
4570 array_get ~lhs_of_null_coalesce
is_lvalue p env ty e2
ty2
4572 begin match resl with
4575 when List.for_all
rest ~
f:(fun x -> ty_equal
(snd
x) (snd res
)) -> res
4576 | _ -> error_array
env p ety1
4578 | Tmixed
| Tnonnull
| Tprim
_ | Tvar
_ | Tfun
_
4579 | Tclass
(_, _) | Tanon
(_, _) ->
4580 error_array
env p ety1
4582 and error_array
env p (r, ty) =
4583 Errors.array_access
p (Reason.to_pos
r) (Typing_print.error
ty);
4584 env, err_witness env p
4586 and error_assign_array_append
env p (r, ty) =
4587 Errors.array_append
p (Reason.to_pos
r) (Typing_print.error
ty);
4588 env, ((r, ty), err_witness env p)
4590 and error_const_mutation
env p (r, ty) =
4591 Errors.const_mutation
p (Reason.to_pos
r) (Typing_print.error
ty);
4592 env, err_witness env p
4595 * Checks if a class (given by cty) contains a given static method.
4597 * We could refactor this + class_get
4599 and class_contains_smethod
env cty
(_pos
, mid
) =
4600 let lookup_member ty =
4602 | _, Tclass
((_, c), _) ->
4603 (match Env.get_class
env c with
4606 Option.is_some
@@ Env.get_static_member
true env class_ mid
4609 let _env, tyl = TUtils.get_concrete_supertypes
env cty
in
4610 List.exists
tyl ~
f:lookup_member
4612 and class_get ~
is_method ~is_const ?
(explicit_tparams
=[]) ?
(incl_tc
=false)
4613 ?
(pos_params
: expr list
option) env cty
(p, mid
) cid =
4616 this_for_method
env cid cty
4620 type_expansions
= [];
4622 substs
= SMap.empty
;
4623 from_class
= Some
cid;
4624 validate_dty
= None
;
4626 class_get_ ~
is_method ~is_const ~
ety_env ~explicit_tparams ~incl_tc
4627 ~pos_params
env cid cty
(p, mid
)
4629 and class_get_ ~
is_method ~is_const ~
ety_env ?
(explicit_tparams
=[])
4630 ?
(incl_tc
=false) ~pos_params
env cid cty
4632 let env, cty
= Env.expand_type
env cty
in
4634 | r, Tany
-> env, (r, Typing_utils.tany env), None
4635 | r, Terr
-> env, err_witness env (Reason.to_pos
r), None
4636 | _, Tdynamic
-> env, cty
, None
4637 | _, Tunresolved
tyl ->
4638 let env, tyl = List.map_env
env tyl begin fun env ty ->
4640 class_get_ ~
is_method ~is_const ~
ety_env ~explicit_tparams ~incl_tc
4641 ~pos_params
env cid ty (p, mid
)
4644 let env, method_
= TUtils.in_var
env (fst cty
, Tunresolved
tyl) in
4646 | _, Tabstract
(_, Some
ty) ->
4647 class_get_ ~
is_method ~is_const ~
ety_env ~explicit_tparams ~incl_tc
4648 ~pos_params
env cid ty (p, mid
)
4649 | _, Tabstract
(_, None
) ->
4650 let resl = try_over_concrete_supertypes env cty
(fun env ty ->
4651 class_get_ ~
is_method ~is_const ~
ety_env ~explicit_tparams ~incl_tc
4652 ~pos_params
env cid ty (p, mid
)) in
4653 begin match resl with
4655 Errors.non_class_member
4656 mid
p (Typing_print.error
(snd cty
))
4657 (Reason.to_pos
(fst cty
));
4658 (env, err_witness env p, None
)
4659 | ((_, (_, ty), _) as res
)::rest ->
4660 if List.exists
rest (fun (_, (_, ty'
), _) -> ty'
<> ty)
4663 Errors.ambiguous_member
4664 mid
p (Typing_print.error
(snd cty
))
4665 (Reason.to_pos
(fst cty
));
4666 (env, err_witness env p, None
)
4670 | _, Tclass
((_, c), paraml
) ->
4671 let class_ = Env.get_class
env c in
4673 | None
-> env, (Reason.Rwitness
p, Typing_utils.tany env), None
4675 (* We need to instantiate generic parameters in the method signature *)
4678 substs
= Subst.make
class_.tc_tparams paraml
} in
4679 if is_const
then begin
4681 if incl_tc
then Env.get_const
env class_ mid
else
4682 match Env.get_typeconst
env class_ mid
with
4684 Errors.illegal_typeconst_direct_access
p;
4687 Env.get_const
env class_ mid
4691 smember_not_found
p ~is_const ~
is_method class_ mid
;
4692 env, (Reason.Rnone
, Typing_utils.terr
env), None
4693 | Some
{ cc_type
; cc_abstract
; cc_pos
; _ } ->
4694 let env, cc_type
= Phase.localize ~
ety_env env cc_type
in
4697 then Some
(cc_pos
, class_.tc_name ^
"::" ^ mid
)
4700 let smethod = Env.get_static_member
is_method env class_ mid
in
4703 (match Env.get_static_member
is_method env class_
4704 SN.Members.__callStatic
with
4706 smember_not_found
p ~is_const ~
is_method class_ mid
;
4707 env, (Reason.Rnone
, Typing_utils.terr
env), None
4708 | Some
{ce_visibility
= vis
; ce_lsb
= lsb
; ce_type
= lazy (r, Tfun
ft); _} ->
4709 let p_vis = Reason.to_pos
r in
4710 TVis.check_class_access
p env (p_vis, vis
, lsb
) cid class_;
4712 Phase.localize_ft ~use_pos
:p ~
ety_env ~explicit_tparams
:explicit_tparams
env ft in
4713 let arity_pos = match ft.ft_params
with
4714 | [_; { fp_pos
; fp_kind
= FPnormal
; _ }] -> fp_pos
4715 (* we should really assert here but this is not yet validated *)
4718 ft_arity
= Fellipsis
(0, arity_pos);
4719 ft_tparams
= []; ft_params
= [];
4721 env, (r, Tfun
ft), None
4722 | _ -> assert false)
4723 | Some
{ ce_visibility
= vis
; ce_lsb
= lsb
; ce_type
= lazy method_
; _ } ->
4724 let p_vis = Reason.to_pos
(fst method_
) in
4725 TVis.check_class_access
p env (p_vis, vis
, lsb
) cid class_;
4727 begin match method_
with
4728 (* We special case Tfun here to allow passing in explicit tparams to localize_ft. *)
4731 Phase.localize_ft ~use_pos
:p ~
ety_env ~explicit_tparams
:explicit_tparams
env ft
4732 in env, (r, Tfun
ft)
4733 | _ -> Phase.localize ~
ety_env env method_
4738 | _, (Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_
4739 | Tprim
_ | Tvar
_ | Tfun
_ | Ttuple
_ | Tanon
(_, _) | Tobject
4741 (* should never happen; static_class_id takes care of these *)
4742 env, (Reason.Rnone
, Typing_utils.tany env), None
4744 and smember_not_found
pos ~is_const ~
is_method class_ member_name
=
4746 if is_const
then `class_constant
4747 else if is_method then `static_method
4748 else `class_variable
in
4750 let cid = (class_.tc_pos
, class_.tc_name
) in
4751 Errors.smember_not_found
kind pos cid member_name hint
4753 match Env.suggest_static_member
is_method class_ member_name
with
4755 (match Env.suggest_member
is_method class_ member_name
with
4756 | None
when not
class_.tc_members_fully_known
->
4757 (* no error in this case ... the member might be present
4758 * in one of the parents of class_ that the typing cannot see *)
4763 error (`closest
(pos2
, v
))
4766 error (`did_you_mean
(pos2
, v
))
4768 and member_not_found
pos ~
is_method class_ member_name
r =
4769 let kind = if is_method then `method_
else `member
in
4770 let cid = class_.tc_pos
, class_.tc_name
in
4771 let reason = Reason.to_string
4772 ("This is why I think it is an object of type "^strip_ns
class_.tc_name
) r
4775 Errors.member_not_found
kind pos cid member_name hint
reason in
4776 match Env.suggest_member
is_method class_ member_name
with
4778 (match Env.suggest_static_member
is_method class_ member_name
with
4779 | None
when not
class_.tc_members_fully_known
->
4780 (* no error in this case ... the member might be present
4781 * in one of the parents of class_ that the typing cannot see *)
4785 | Some
(def_pos
, v
) ->
4786 error (`closest
(def_pos
, v
))
4788 | Some
(def_pos
, v
) ->
4789 error (`did_you_mean
(def_pos
, v
))
4791 (* Look up the type of the property id in the type ty1 of the receiver and
4792 * use the function k to postprocess the result.
4794 * Essentially, if ty1 is a concrete type, e.g., class C, then k is applied
4795 * to the type of the property id in C; and if ty1 is an unresolved type,
4796 * e.g., a union of classes (C1 | ... | Cn), then k is applied to the type
4797 * of the property id in each Ci and the results are collected into an
4800 * The extra flexibility offered by the functional argument k is used in two
4803 * (1) when type-checking method calls: if the receiver has an unresolved
4804 * type, then we need to type-check the method call with each possible
4805 * receiver type and collect the results into an unresolved type;
4807 * (2) when type-checking assignments to properties: if the receiver has
4808 * an unresolved type, then we need to check that the right hand side
4809 * value can be assigned to the property id for each of the possible types
4812 and obj_get ~
is_method ~
nullsafe ?
(valkind = `other
) ?
(explicit_tparams
=[])
4813 ?
(pos_params
: expr list
option) env ty1 cid id k =
4814 let env, method_
, _ =
4815 obj_get_with_visibility ~
is_method ~
nullsafe ~
valkind ~pos_params
4816 ~explicit_tparams
env ty1 cid id k in
4819 and obj_get_with_visibility ~
is_method ~
nullsafe ~
valkind ~pos_params
4820 ?
(explicit_tparams
=[]) env ty1 cid id k =
4821 obj_get_ ~
is_method ~
nullsafe ~
valkind ~pos_params ~explicit_tparams
env ty1
4822 cid id k (fun ty -> ty)
4824 (* We know that the receiver is a concrete class: not a generic with
4825 * bounds, or a Tunresolved. *)
4826 and obj_get_concrete_ty ~
is_method ~
valkind ?
(explicit_tparams
=[])
4827 env concrete_ty class_id
(id_pos
, id_str
) k_lhs =
4828 let default () = env, (Reason.Rwitness id_pos
, Typing_utils.tany env), None
in
4829 let mk_ety_env r class_info x paraml
=
4830 let this_ty = k_lhs (r, (Tclass
(x, paraml
))) in
4832 type_expansions
= [];
4834 substs
= Subst.make
class_info.tc_tparams paraml
;
4835 from_class
= Some class_id
;
4836 validate_dty
= None
;
4839 match concrete_ty
with
4840 | (r, Tclass
(x, paraml
)) ->
4841 begin match Env.get_class
env (snd
x) with
4845 | Some
class_info when not
is_method
4846 && not
(Env.is_strict
env)
4847 && class_info.tc_name
= SN.Classes.cStdClass
->
4850 | Some
class_info ->
4852 if List.length
paraml = 0
4853 then List.map
class_info.tc_tparams
4854 (fun _ -> Reason.Rwitness id_pos
, Typing_utils.tany env)
4856 let old_member_info = Env.get_member
is_method env class_info id_str
in
4857 let self = Env.get_self_id
env in
4858 let member_info, shadowed
= if SMap.mem
self class_info.tc_ancestors
4860 (* We look up the current context to see if there is a field/method with
4861 * private visibility. If there is one, that one takes precedence *)
4862 begin match Env.get_class
env self with
4863 | None
-> old_member_info, false
4864 | Some self_class
->
4865 match Env.get_member
is_method env self_class id_str
with
4866 | Some
{ ce_visibility
= Vprivate
_; _ } as member_info ->
4868 | _ -> old_member_info, false
4870 else old_member_info, false
4873 begin match member_info with
4874 | None
when not
is_method ->
4875 if not
(SN.Members.is_special_xhp_attribute id_str
)
4876 then member_not_found id_pos ~
is_method class_info id_str
r;
4880 begin match Env.get_member
is_method env class_info SN.Members.__call
with
4882 member_not_found id_pos ~
is_method class_info id_str
r;
4885 | Some
{ce_visibility
= vis
; ce_type
= lazy (r, Tfun
ft); _} ->
4886 let mem_pos = Reason.to_pos
r in
4887 TVis.check_obj_access id_pos
env (mem_pos, vis
);
4889 (* the return type of __call can depend on the class params or be this *)
4890 let ety_env = mk_ety_env r class_info x paraml in
4891 let env, ft = Phase.localize_ft ~use_pos
:id_pos ~
ety_env env ft in
4893 let arity_pos = match ft.ft_params
with
4894 | [_; { fp_pos
; fp_kind
= FPnormal
; _ }] -> fp_pos
4895 (* we should really assert here but this is not yet validated *)
4898 (* we change the params of the underlying declaration to act as a
4899 * variadic function ... this transform cannot be done when processing
4900 * the declaration of call because direct calls to $inst->__call are also
4904 ft_arity
= Fellipsis
(0, arity_pos); ft_tparams
= []; ft_params
= []; } in
4906 let member_ty = (r, Tfun
ft) in
4907 env, member_ty, Some
(mem_pos, vis
)
4911 end (* match Env.get_member is_method env class_info SN.Members.__call *)
4913 | Some
({ce_visibility
= vis
; ce_type
= lazy member_
; _ } as member_ce
) ->
4914 let mem_pos = Reason.to_pos
(fst member_
) in
4915 if shadowed
then begin match old_member_info with
4916 | Some
({ce_visibility
= old_vis
; ce_type
= lazy old_member
; _ }) ->
4917 let old_mem_pos = Reason.to_pos
(fst old_member
) in
4918 begin match class_id
with
4919 | CIexpr
(_, This
) when snd
x = self -> ()
4920 | _ -> Errors.ambiguous_object_access
4921 id_pos id_str
mem_pos (TUtils.string_of_visibility old_vis
) old_mem_pos self (snd
x)
4925 TVis.check_obj_access id_pos
env (mem_pos, vis
);
4926 let member_ty = Typing_enum.member_type
env member_ce
in
4927 let ety_env = mk_ety_env r class_info x paraml in
4928 let env, member_ty =
4929 begin match member_ty with
4931 (* We special case function types here to be able to pass explicit type
4934 Phase.localize_ft ~use_pos
:id_pos ~explicit_tparams ~
ety_env env ft in
4936 | _ -> Phase.localize ~
ety_env env member_ty
4939 if member_ce
.ce_const
&& valkind = `lvalue
then
4940 if not
(env.Env.inside_constructor
&&
4941 (* expensive call behind short circuiting && *)
4942 SubType.is_sub_type
env (Env.get_self
env) concrete_ty
) then
4943 Errors.assigning_to_const id_pos
;
4945 env, member_ty, Some
(mem_pos, vis
)
4946 end (* match member_info *)
4948 end (* match Env.get_class env (snd x) *)
4950 let ty = Reason.Rdynamic_prop id_pos
, Tdynamic
in
4958 Errors.non_object_member
4959 id_str id_pos
(Typing_print.error (snd concrete_ty
))
4960 (Reason.to_pos
(fst concrete_ty
));
4964 (* k_lhs takes the type of the object receiver *)
4965 and obj_get_ ~
is_method ~
nullsafe ~
valkind ~
(pos_params
: expr list
option) ?
(explicit_tparams
=[])
4966 env ty1 cid (id_pos
, id_str
as id) k k_lhs =
4967 let env, ety1
= Env.expand_type
env ty1 in
4968 let nullable_obj_get ty = match nullsafe with
4970 let env, method_
, x = obj_get_ ~
is_method ~
nullsafe ~
valkind
4971 ~pos_params ~explicit_tparams
env ty cid id k k_lhs in
4972 let env, method_
= TUtils.non_null
env method_
in
4973 env, (Reason.Rnullsafe_op
p1, Toption method_
), x
4975 Errors.null_member id_str id_pos
4977 "This is what makes me believe it can be null"
4980 k (env, (fst ety1
, Typing_utils.terr
env), None
) in
4982 | _, Tunresolved
tyl ->
4983 let (env, vis
), tyl = List.map_env
(env, None
) tyl
4984 begin fun (env, vis
) ty ->
4986 obj_get_ ~
is_method ~
nullsafe ~
valkind ~pos_params
4987 ~explicit_tparams
env ty cid id k k_lhs in
4988 (* There is one special case where we need to expose the
4989 * visibility outside of obj_get (checkout inst_meth special
4991 * We keep a witness of the "most restrictive" visibility
4992 * we encountered (position + visibility), to be able to
4993 * special case inst_meth.
4995 let vis = TVis.min_vis_opt
vis vis'
in
4998 let env, method_
= TUtils.in_var
env (fst ety1
, Tunresolved
(tyl)) in
5001 | p'
, (Tabstract
(ak
, Some
ty)) ->
5002 let k_lhs'
ty = match ak
with
5003 | AKnewtype
(_, _) -> k_lhs ty
5004 | _ -> k_lhs (p'
, Tabstract
(ak
, Some
ty)) in
5005 obj_get_ ~
is_method ~
nullsafe ~
valkind ~pos_params ~explicit_tparams
env ty cid id k k_lhs'
5007 | p'
, (Tabstract
(ak
,_)) ->
5009 try_over_concrete_supertypes env ety1
5011 (* We probably don't want to rewrap new types for the 'this' closure *)
5012 (* TODO AKENN: we shouldn't refine constraints by changing
5013 * the type like this *)
5014 let k_lhs'
ty = match ak
with
5015 | AKnewtype
(_, _) -> k_lhs ty
5016 | _ -> k_lhs (p'
, Tabstract
(ak
, Some
ty)) in
5017 obj_get_concrete_ty ~
is_method ~
valkind ~explicit_tparams
env ty cid id k_lhs'
5019 begin match resl with
5021 Errors.non_object_member
5022 id_str id_pos
(Typing_print.error (snd ety1
))
5023 (Reason.to_pos
(fst ety1
));
5024 k (env, err_witness env id_pos
, None
)
5026 | ((_env, (_, ty), _vis
) as res
)::rest ->
5027 if List.exists
rest (fun (_, (_,ty'
), _) -> ty'
<> ty)
5030 Errors.ambiguous_member
5031 id_str id_pos
(Typing_print.error (snd ety1
))
5032 (Reason.to_pos
(fst ety1
));
5033 k (env, err_witness env id_pos
, None
)
5038 | _, Toption
ty -> nullable_obj_get ty
5039 | r, Tprim
Nast.Tvoid
->
5040 nullable_obj_get (r, Tany
)
5042 k (obj_get_concrete_ty ~
is_method ~
valkind ~explicit_tparams
env ety1
cid id k_lhs)
5044 and class_id_for_new
p env cid =
5045 let env, te, ty = static_class_id ~check_constraints
:false p env cid in
5046 (* Need to deal with union case *)
5047 let rec get_info res
tyl =
5049 | [] -> env, te, res
5052 | Tunresolved
tyl'
->
5053 get_info res
(tyl'
@ tyl)
5055 (* Instantiation on an abstract class (e.g. from classname<T>) is
5056 * via the base type (to check constructor args), but the actual
5057 * type `ty` must be preserved. *)
5058 match TUtils.get_base_type
env ty with
5059 | _, Tclass
(sid
, _) ->
5061 let class_ = Env.get_class
env (snd sid
) in
5063 | None
-> get_info res
tyl
5064 | Some
class_info -> get_info ((sid
, class_info, ty)::res
) tyl
5066 | _, (Tany
| Terr
| Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_
5067 | Tprim
_ | Tvar
_ | Tfun
_ | Tabstract
(_, _) | Ttuple
_
5068 | Tanon
(_, _) | Tunresolved
_ | Tobject
| Tshape
_ | Tdynamic
) ->
5072 (* To be a valid trait declaration, all of its 'require extends' must
5073 * match; since there's no multiple inheritance, it follows that all of
5074 * the 'require extends' must belong to the same inheritance hierarchy
5075 * and one of them should be the child of all the others *)
5076 and trait_most_concrete_req_class trait
env =
5077 List.fold_left trait
.tc_req_ancestors ~
f:begin fun acc
(_p
, ty) ->
5078 let _r, (_p
, name), _paraml
= TUtils.unwrap_class_type
ty in
5079 let keep = match acc
with
5080 | Some
(c, _ty
) -> SMap.mem
name c.tc_ancestors
5085 let class_ = Env.get_class
env name in
5088 | Some
{ tc_kind
= Ast.Cinterface
; _ } -> acc
5089 | Some
{ tc_kind
= Ast.Ctrait
; _ } ->
5090 (* this is an error case for which the nastCheck spits out
5091 * an error, but does *not* currently remove the offending
5092 * 'require extends' or 'require implements' *)
5094 | Some
c -> Some
(c, ty)
5098 (* If there are no explicit type arguments then generate fresh type variables
5099 * for all of them. Otherwise, check the arity, and use the explicit types. *)
5100 and resolve_type_arguments
env p class_id tparaml hintl
=
5101 (* For explicit type arguments we support a wildcard syntax `_` for which
5102 * Hack will generate a fresh type variable *)
5103 let resolve_type_argument env hint
=
5105 | (_, Happly
((_, id), [])) when id = SN.Typehints.wildcard
->
5106 Env.fresh_unresolved_type
env
5108 Phase.localize_hint_with_self
env hint
in
5109 let length_hintl = List.length hintl
in
5110 let length_tparaml = List.length tparaml
in
5111 if length_hintl <> length_tparaml
5113 if length_hintl <> 0
5114 then Errors.type_arity
p (snd class_id
) (string_of_int
length_tparaml);
5115 List.map_env
env tparaml
begin fun env _ ->
5116 Env.fresh_unresolved_type
env end
5119 List.map_env
env hintl
resolve_type_argument
5121 (* Do all of the above, and also check any constraints associated with the type parameters.
5123 and resolve_type_arguments_and_check_constraints ~check_constraints
5124 env p class_id from_class tparaml hintl
=
5125 let env, type_argl
= resolve_type_arguments
env p class_id tparaml hintl
in
5126 let this_ty = (Reason.Rwitness
(fst class_id
), Tclass
(class_id
, type_argl
)) in
5128 if check_constraints
5129 then let ety_env = {
5130 type_expansions
= [];
5132 substs
= Subst.make tparaml type_argl
;
5133 from_class
= Some from_class
;
5134 validate_dty
= None
;
5136 Phase.check_tparams_constraints ~use_pos
:p ~
ety_env env tparaml
5140 (* When invoking a method the class_id is used to determine what class we
5141 * lookup the method in, but the type of 'this' will be the late bound type.
5145 * public static function get(): this { return new static(); }
5147 * public static function alias(): this { return self::get(); }
5150 * In C::alias, when we invoke self::get(), 'self' is resolved to the class
5151 * in the lexical scope (C), so call C::get. However the method is executed in
5152 * the current context, so static inside C::get will be resolved to the late
5153 * bound type (get_called_class() within C::alias).
5155 * This means when determining the type of this, CIparent and CIself should be
5156 * changed to CIstatic. For the other cases of C::get() or $c::get(), we only
5157 * look at the left hand side of the '::' and use the type type associated
5160 * Thus C::get() will return a type C, while $c::get() will return the same
5163 and this_for_method
env cid default_ty
= match cid with
5164 | CIparent
| CIself
| CIstatic
->
5165 let p = Reason.to_pos
(fst default_ty
) in
5166 let env, _te
, ty = static_class_id ~check_constraints
:false p env CIstatic
in
5167 ExprDepTy.make
env CIstatic
ty
5171 and static_class_id ~check_constraints
p env =
5172 let make_result env te ty =
5173 env, ((p, ty), te), ty in
5176 (match Env.get_self
env with
5177 | _, Tclass
((_, self), _) ->
5178 (match Env.get_class
env self with
5180 {tc_kind
= Ast.Ctrait
; _}
5182 (match trait_most_concrete_req_class trait
env with
5184 Errors.parent_in_trait
p;
5185 make_result env T.CIparent
(Reason.Rwitness
p, Typing_utils.terr
env)
5186 | Some
(_, parent_ty
) ->
5187 (* inside a trait, parent is SN.Typehints.this, but with the
5188 * type of the most concrete class that the trait has
5189 * "require extend"-ed *)
5190 let r = Reason.Rwitness
p in
5191 let env, parent_ty
= Phase.localize_with_self
env parent_ty
in
5192 make_result env T.CIparent
(r, TUtils.this_of parent_ty
)
5195 let parent = Env.get_parent
env in
5196 let parent_defined = snd
parent <> Typing_utils.tany env in
5197 if not
parent_defined
5198 then Errors.parent_undefined
p;
5199 let r = Reason.Rwitness
p in
5200 let env, parent = Phase.localize_with_self
env parent in
5201 (* parent is still technically the same object. *)
5202 make_result env T.CIparent
(r, TUtils.this_of
(r, snd
parent))
5204 | _, (Terr
| Tany
| Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_ | Tprim
_
5205 | Tfun
_ | Ttuple
_ | Tshape
_ | Tvar
_ | Tdynamic
5206 | Tanon
(_, _) | Tunresolved
_ | Tabstract
(_, _) | Tobject
5208 let parent = Env.get_parent
env in
5209 let parent_defined = snd
parent <> Typing_utils.tany env in
5210 if not
parent_defined
5211 then Errors.parent_undefined
p;
5212 let r = Reason.Rwitness
p in
5213 let env, parent = Phase.localize_with_self
env parent in
5214 (* parent is still technically the same object. *)
5215 make_result env T.CIparent
(r, TUtils.this_of
(r, snd
parent))
5218 make_result env T.CIstatic
5219 (Reason.Rwitness
p, TUtils.this_of
(Env.get_self
env))
5221 make_result env T.CIself
5222 (Reason.Rwitness
p, snd
(Env.get_self
env))
5223 | CI
(c, hl
) as e1
->
5224 let class_ = Env.get_class
env (snd
c) in
5227 make_result env (T.CI
(c, hl
)) (Reason.Rwitness
p, Typing_utils.tany env)
5230 resolve_type_arguments_and_check_constraints ~check_constraints
5231 env p c e1
class_.tc_tparams hl
in
5232 make_result env (T.CI
(c, hl
)) ty
5234 | CIexpr
(p, _ as e) ->
5235 let env, te, ty = expr
env e in
5236 let rec resolve_ety ty =
5237 let env, ty = TUtils.fold_unresolved
env ty in
5238 let _, ty = Env.expand_type
env ty in
5239 match TUtils.get_base_type
env ty with
5240 | _, Tabstract
(AKnewtype
(classname
, [the_cls
]), _) when
5241 classname
= SN.Classes.cClassname
-> resolve_ety the_cls
5242 | _, Tabstract
(AKgeneric
_, _)
5244 | r, Tunresolved
tyl -> r, Tunresolved
(List.map
tyl resolve_ety)
5245 | _, Tvar
_ as ty -> resolve_ety ty
5246 | _, Tdynamic
as ty -> ty
5247 | _, (Tany
| Tprim Tstring
| Tabstract
(_, None
) | Tmixed
| Tobject
)
5248 when not
(Env.is_strict
env) ->
5249 Reason.Rwitness
p, Typing_utils.tany env
5250 | _, (Terr
| Tany
| Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_
5251 | Tprim
_ | Tfun
_ | Ttuple
_
5252 | Tabstract
((AKenum
_ | AKdependent
_ | AKnewtype
_), _)
5253 | Tanon
(_, _) | Tobject
| Tshape
_ as ty
5255 Errors.expected_class ~suffix
:(", but got "^
Typing_print.error ty) p;
5256 Reason.Rwitness
p, Typing_utils.terr
env in
5257 let result_ty = resolve_ety ty in
5258 make_result env (T.CIexpr
te) result_ty
5260 and call_construct
p env class_ params el uel
cid =
5261 let cid = if cid = CIparent
then CIstatic
else cid in
5262 let env, tcid
, cid_ty
= static_class_id ~check_constraints
:false p env cid in
5264 type_expansions
= [];
5266 substs
= Subst.make
class_.tc_tparams
params;
5267 from_class
= Some
cid;
5268 validate_dty
= None
;
5270 let env = Phase.check_tparams_constraints ~use_pos
:p ~
ety_env env class_.tc_tparams
in
5271 if class_.tc_is_xhp
then env, tcid
, [], [], (Reason.Rnone
, TUtils.tany env) else
5272 let cstr = Env.get_construct
env class_ in
5273 let mode = Env.get_mode
env in
5274 match (fst
cstr) with
5277 (mode = FileInfo.Mstrict
|| mode = FileInfo.Mpartial
) &&
5278 class_.tc_members_fully_known
5279 then Errors.constructor_no_args
p;
5280 let env, tel, _tyl
= exprs env el
in
5281 env, tcid
, tel, [], (Reason.Rnone
, TUtils.terr
env)
5282 | Some
{ ce_visibility
= vis; ce_type
= lazy m; _ } ->
5283 TVis.check_obj_access
p env (Reason.to_pos
(fst
m), vis);
5284 let env, m = Phase.localize ~
ety_env env m in
5285 let env, tel, tuel
, _ty
= call ~
expected:None
p env m el uel
in
5286 env, tcid
, tel, tuel
, m
5288 and check_arity ?
(did_unpack
=false) pos pos_def
(arity:int) exp_arity
=
5289 let exp_min = (Typing_defs.arity_min exp_arity
) in
5291 then Errors.typing_too_few_args
pos pos_def
;
5292 match exp_arity
with
5293 | Fstandard
(_, exp_max
) ->
5294 let arity = if did_unpack
then arity + 1 else arity in
5296 then Errors.typing_too_many_args
pos pos_def
;
5297 | Fvariadic
_ | Fellipsis
_ -> ()
5299 and check_lambda_arity lambda_pos def_pos lambda_arity expected_arity
=
5300 let expected_min = Typing_defs.arity_min expected_arity
in
5301 match lambda_arity
, expected_arity
with
5302 | Fstandard
(lambda_min
, _), Fstandard
_ ->
5303 if lambda_min
< expected_min
5304 then Errors.typing_too_few_args lambda_pos def_pos
;
5305 if lambda_min
> expected_min
5306 then Errors.typing_too_many_args lambda_pos def_pos
5309 and check_deprecated
p { ft_pos
; ft_deprecated
; _ } =
5310 match ft_deprecated
with
5311 | Some
s -> Errors.deprecated_use
p ft_pos
s
5314 (* The variadic capture argument is an array listing the passed
5315 * variable arguments for the purposes of the function body; callsites
5316 * should not unify with it *)
5317 and variadic_param
env ft =
5318 match ft.ft_arity
with
5319 | Fvariadic
(_, param) -> env, Some
param
5320 | Fellipsis
(_, pos) ->
5321 env, Some
(TUtils.default_fun_param ~
pos (Reason.Rvar_param
pos, Tany
))
5322 | Fstandard
_ -> env, None
5324 and param_modes ?
(is_variadic
=false) { fp_pos
; fp_kind
; _ } (pos, e) =
5325 match fp_kind
, e with
5326 | FPnormal
, Unop
(Ast.Uref
, _) ->
5327 Errors.pass_by_ref_annotation_unexpected
pos fp_pos is_variadic
5328 | FPnormal
, Callconv
_ ->
5329 Errors.inout_annotation_unexpected
pos fp_pos is_variadic
5331 | FPref
, Unop
(Ast.Uref
, _) -> ()
5332 | FPref
, Callconv
(kind, _) ->
5334 (* HHVM supports pass-by-ref for arguments annotated as 'inout'. *)
5338 Errors.pass_by_ref_annotation_missing
pos fp_pos
5339 (* HHVM also allows '&' on arguments to inout parameters via interop layer. *)
5340 | FPinout
, Unop
(Ast.Uref
, _)
5341 | FPinout
, Callconv
(Ast.Pinout
, _) -> ()
5343 Errors.inout_annotation_missing
pos fp_pos
5345 and inout_write_back
env { fp_type
; _ } (_, e) =
5347 | Callconv
(Ast.Pinout
, e1
) ->
5348 (* Translate the write-back semantics of inout parameters.
5350 * This matters because we want to:
5351 * (1) make sure we can write to the original argument
5352 * (modifiable lvalue check)
5353 * (2) allow for growing of locals / Tunresolveds (type side effect)
5354 * but otherwise unify the argument type with the parameter hint
5356 let env, _te
, _ty
= assign_
(fst e1
) Reason.URparam_inout
env e1 fp_type
in
5360 and call ~
expected ?
(is_expr_statement
=false) ?method_call_info
pos env fty el uel
=
5361 let env, tel, tuel
, ty =
5362 call_ ~
expected ~is_expr_statement ~method_call_info
pos env fty el uel
in
5363 (* We need to solve the constraints after every single function call.
5364 * The type-checker is control-flow sensitive, the same value could
5365 * have different type depending on the branch that we are in.
5366 * When this is the case, a call could violate one of the constraints
5368 let env = Env.check_todo
env in
5371 and call_ ~
expected ~method_call_info ~is_expr_statement
pos env fty el uel
=
5372 let make_unpacked_traversable_ty pos ty =
5373 let unpack_r = Reason.Runpack_param
pos in
5374 unpack_r, Tclass
((pos, SN.Collections.cTraversable
), [ty])
5376 let env, efty
= Env.expand_type
env fty in
5378 | _, (Terr
| Tany
| Tunresolved
[] | Tdynamic
) ->
5379 let el = el @ uel
in
5380 let env, tel = List.map_env
env el begin fun env elt
->
5382 expr ~
expected:(pos, Reason.URparam
, (Reason.Rnone
, Typing_utils.tany env))
5383 ~is_func_arg
:true env elt
5387 | _, Callconv
(Ast.Pinout
, e1
) ->
5388 let env, _te
, _ty
= assign_
(fst e1
) Reason.URparam_inout
env e1 efty
in
5390 | _, Unop
(Ast.Uref
, e1
) ->
5391 let env, _te
, _ty
= assign_
(fst e1
) Reason.URparam
env e1 efty
in
5396 let env = call_untyped_unpack
env uel
in
5398 if snd efty
= Tdynamic
then
5399 (Reason.Rdynamic_call
pos, Tdynamic
)
5400 else (Reason.Rnone
, Typing_utils.tany env)
5403 | _, Tunresolved
[ty] ->
5404 call ~
expected pos env ty el uel
5405 | r, Tunresolved
tyl ->
5406 let env, retl
= List.map_env
env tyl begin fun env ty ->
5407 let env, _, _, ty = call ~
expected pos env ty el uel
in env, ty
5409 let env, ty = TUtils.in_var
env (r, Tunresolved retl
) in
5412 (* Typing of format string functions. It is dependent on the arguments (el)
5413 * so it cannot be done earlier.
5415 Typing_reactivity.verify_void_return_to_rx ~is_expr_statement
pos env ft;
5416 let pos_def = Reason.to_pos r2
in
5417 let env, ft = Typing_exts.retype_magic_func
env ft el in
5418 check_deprecated
pos ft;
5419 let env, var_param = variadic_param
env ft in
5421 (* Force subtype with expected result *)
5422 let env = check_expected_ty
"Call result" env ft.ft_ret
expected in
5424 let is_lambda e = match snd
e with Efun
_ -> true | _ -> false in
5426 let get_next_param_info paraml =
5429 false, Some
param, paraml
5431 true, var_param, paraml in
5433 (* Given an expected function type ft, check types for the non-unpacked
5434 * arguments. Don't check lambda expressions if check_lambdas=false *)
5435 let rec check_args check_lambdas
env el paraml =
5437 (* We've got an argument *)
5438 | ((pos, _ as e), opt_result
) :: el ->
5439 (* Pick up next parameter type info *)
5440 let is_variadic, opt_param
, paraml = get_next_param_info paraml in
5441 let env, one_result
=
5442 if is_lambda e && not check_lambdas
|| Option.is_some opt_result
5443 then env, opt_result
5445 begin match opt_param
with
5448 expr ~is_func_arg
:true ~accept_using_var
:param.fp_accept_disposable
5449 ~
expected:(pos, Reason.URparam
, param.fp_type
) env e in
5450 let env = call_param
env param (e, ty) ~
is_variadic in
5453 let env, te, ty = expr ~
expected:(pos, Reason.URparam
,
5454 (Reason.Rnone
, Typing_utils.tany env)) ~is_func_arg
:true env e in
5457 let env, rl
, paraml = check_args check_lambdas
env el paraml in
5458 env, (e, one_result
)::rl
, paraml
5463 (* First check the non-lambda arguments. For generic functions, this
5464 * is likely to resolve type variables to concrete types *)
5465 let rl = List.map
el (fun e -> (e, None
)) in
5466 let env, rl, _ = check_args false env rl ft.ft_params
in
5467 (* Now check the lambda arguments, hopefully with type variables resolved *)
5468 let env, rl, paraml = check_args true env rl ft.ft_params
in
5469 (* We expect to see results for all arguments after this second pass *)
5473 | None
-> failwith
"missing parameter in check_args" in
5475 let l = List.map
rl (fun (_, opt
) -> get_param opt
) in
5477 TR.check_call env method_call_info
pos r2
ft tys
;
5478 let env, tuel
, arity, did_unpack
=
5480 | [] -> env, [], List.length
el, false
5482 (* Enforces that e is unpackable. If e is a tuple, check types against
5483 * parameter types *)
5484 let env, te, ety
= expr
env e in
5487 let rec check_elements env tyl paraml =
5491 let is_variadic, opt_param
, paraml = get_next_param_info paraml in
5492 match opt_param
with
5495 let env = call_param
env param (e, ty) ~
is_variadic in
5496 check_elements env tyl paraml in
5497 let env = check_elements env tyl paraml in
5498 env, [te], List.length
el + List.length
tyl, false
5500 let param_tyl = List.map
paraml (fun param -> param.fp_type
) in
5501 let add_variadic_param_ty param_tyl =
5502 match var_param with
5503 | Some
param -> param.fp_type
:: param_tyl
5504 | None
-> param_tyl in
5505 let param_tyl = add_variadic_param_ty param_tyl in
5507 let env = List.fold_right
param_tyl ~init
:env
5508 ~
f:(fun param_ty env ->
5509 let traversable_ty = make_unpacked_traversable_ty pos param_ty in
5510 Type.sub_type
pos Reason.URparam
env ety
traversable_ty)
5512 env, [te], List.length
el, true
5514 (* If we unpacked an array, we don't check arity exactly. Since each
5515 * unpacked array consumes 1 or many parameters, it is nonsensical to say
5516 * that not enough args were passed in (so we don't do the min check).
5518 let () = check_arity ~did_unpack
pos pos_def arity ft.ft_arity
in
5519 (* Variadic params cannot be inout so we can stop early *)
5520 let env = wfold_left2 inout_write_back
env ft.ft_params
el in
5522 TR.get_adjusted_return_type
env method_call_info
ft.ft_ret
in
5523 env, tel, tuel
, ret_ty
5524 | r2
, Tanon
(arity, id) ->
5525 let env, tel, tyl = exprs ~is_func_arg
:true env el in
5526 let expr_for_unpacked_expr_list env = function
5527 | [] -> env, [], None
, Pos.none
5528 | (pos, _) as e :: _ ->
5529 let env, te, ety
= expr
env e in
5530 env, [te], Some ety
, pos
5532 let append_tuple_types tyl = function
5533 | Some
(_, Ttuple tuple_tyl
) -> tyl @ tuple_tyl
5536 let determine_arity env min_arity
pos = function
5538 | Some
(_, Ttuple
_) ->
5539 env, Fstandard
(min_arity
, min_arity
)
5541 (* We need to figure out the underlying type of the unpacked expr type.
5543 * For example, assume the call is:
5545 * where $y is a variadic or collection of strings.
5547 * $y may have the type Tarraykind or Traversable, however we need to
5548 * pass Fvariadic a param of type string.
5550 * Assuming $y has type Tarraykind, in order to get the underlying type
5551 * we create a fresh_type(), wrap it in a Traversable and make that
5552 * Traversable a super type of the expr type (Tarraykind). This way
5553 * we can infer the underlying type and create the correct param for
5556 let ty = Env.fresh_type
() in
5557 let traversable_ty = make_unpacked_traversable_ty pos ty in
5558 let env = Type.sub_type
pos Reason.URparam
env ety
traversable_ty in
5564 fp_accept_disposable
= false;
5565 fp_mutability
= None
;
5566 fp_rx_annotation
= None
;
5569 env, Fvariadic
(min_arity
, param)
5571 let env, tuel
, uety_opt
, uepos
= expr_for_unpacked_expr_list env uel
in
5572 let tyl = append_tuple_types tyl uety_opt
in
5573 let env, call_arity
= determine_arity env (List.length
tyl) uepos uety_opt
in
5574 let anon = Env.get_anonymous
env id in
5575 let fpos = Reason.to_pos r2
in
5578 Errors.anonymous_recursive_call
pos;
5579 env, tel, tuel
, err_witness env pos
5580 | Some
(reactivity, is_coroutine, ftys
, _, anon) ->
5581 let () = check_arity
pos fpos (Typing_defs.arity_min call_arity
) arity in
5582 let tyl = List.map
tyl TUtils.default_fun_param
in
5583 let env, _, ty = anon ~
el env tyl call_arity
in
5585 (Reason.Rlambda_use
pos, Tfun
{
5587 ft_deprecated
= None
;
5588 ft_abstract
= false;
5589 ft_is_coroutine
= is_coroutine;
5592 ft_where_constraints
= [];
5595 ft_ret_by_ref
= false;
5596 ft_reactive
= reactivity;
5597 ft_return_disposable
= false;
5598 ft_mutability
= None
;
5599 ft_returns_mutable
= false;
5600 ft_decl_errors
= None
;
5601 ft_returns_void_to_rx
= false;
5603 ftys
:= TUtils.add_function_type
env fty !ftys
;
5605 | _, Tarraykind
_ when not
(Env.is_strict
env) ->
5606 (* Relaxing call_user_func to work with an array in partial mode *)
5607 let env = call_untyped_unpack
env uel
in
5608 env, [], [], (Reason.Rnone
, Typing_utils.tany env)
5611 let env = call_untyped_unpack
env uel
in
5612 env, [], [], err_witness env pos
5615 and call_param
env param ((pos, _ as e), arg_ty
) ~
is_variadic =
5616 (match param.fp_name
with
5618 | Some
name -> Typing_suggest.save_param
name env param.fp_type arg_ty
5620 param_modes ~
is_variadic param e;
5622 (* When checking params the type 'x' may be expression dependent. Since
5623 * we store the expression id in the local env for Lvar, we want to apply
5626 let env, dep_ty
= match snd
e with
5627 | Lvar
_ -> ExprDepTy.make
env (CIexpr
e) arg_ty
5628 | _ -> env, arg_ty
in
5629 Type.coerce_type
pos Reason.URparam
env dep_ty
param.fp_type
5631 and call_untyped_unpack
env uel
= match uel
with
5632 (* In the event that we don't have a known function call type, we can still
5633 * verify that any unpacked arguments (`...$args`) are something that can
5634 * be actually unpacked. *)
5637 let env, _, ety
= expr
env e in
5639 | _, Ttuple
_ -> env (* tuples are always fine *)
5642 let ty = Env.fresh_type
() in
5643 let unpack_r = Reason.Runpack_param
pos in
5644 let unpack_ty = unpack_r, Tclass
((pos, SN.Collections.cTraversable
), [ty]) in
5645 Type.coerce_type
pos Reason.URparam
env ety
unpack_ty
5650 Errors.bad_call
p (Typing_print.error ty)
5652 (* to be used to throw typing error if failing to satisfy subtype relation *)
5653 and enforce_sub_ty
env p ty1 ty2 =
5654 let env = Type.sub_type
p Reason.URnone
env ty1 ty2 in
5655 Env.expand_type
env ty1
5657 (* throws typing error if neither t <: ty nor t <: dynamic, and adds appropriate
5658 * constraint to env otherwise *)
5659 and check_type
ty p r env t
=
5660 let is_ty = SubType.is_sub_type
env t
(r, ty) in
5661 let is_dynamic = SubType.is_sub_type
env t
(r, Tdynamic
) in
5662 match is_ty, is_dynamic with
5663 | false, true -> enforce_sub_ty
env p t
(r, Tdynamic
)
5664 | _ -> enforce_sub_ty
env p t
(r, ty)
5666 (* does check_type with num and then gives back normalized type and env *)
5667 and check_num
env p t
r =
5668 let env2, t2
= check_type
(Tprim Tnum
) p r env t
in
5669 env2, if SubType.is_sub_type
env2 t
(fst t2
, Tprim Tint
)
5670 then (fst t2
, Tprim Tint
)
5671 else if SubType.is_sub_type
env2 t
(fst t2
, Tprim Tfloat
)
5672 then (fst t2
, Tprim Tfloat
)
5673 else if SubType.is_sub_type
env2 t
(fst t2
, Tprim Tnum
)
5674 then (fst t2
, Tprim Tnum
)
5675 else (fst t2
, Tdynamic
)
5677 (* does check_type with int and then gives back normalized type and env *)
5678 and check_int
env p t
r =
5679 let env2, t2
= check_type
(Tprim Tint
) p r env t
in
5680 env2, if SubType.is_sub_type
env2 t
(fst t2
, Tprim Tint
)
5681 then (fst t2
, Tprim Tint
)
5682 else (fst t2
, Tdynamic
)
5684 and unop ~is_func_arg ~
forbid_uref p env uop
te ty =
5685 let make_result env te result_ty =
5686 env, T.make_typed_expr
p result_ty (T.Unop
(uop
, te)), result_ty in
5687 let is_any = TUtils.is_any env in
5689 (* TODO: is a check like "Async.enforce_nullable_or_not_awaitable env p ty;"
5690 * necessary or desired anywhere here? And if so, don't binops need it as well?
5694 then make_result env te ty
5695 else (* args isn't any or a variant thereof so can actually do stuff *)
5696 (* !$x (logical not) works with any type, so we just return Tbool *)
5697 make_result env te (Reason.Rlogic_ret
p, Tprim Tbool
)
5700 then make_result env te ty
5701 else (* args isn't any or a variant thereof so can actually do stuff *)
5702 let env, t
= check_int
env p ty (Reason.Rbitwise
p) in
5705 | Tdynamic
-> make_result env te (Reason.Rbitwise_dynamic
p, Tdynamic
)
5706 | _ -> make_result env te (Reason.Rbitwise_ret
p, Tprim Tint
)
5712 (* increment and decrement operators modify the value,
5713 * check for immutability violation here *)
5716 | _, T.ImmutableVar
(p, x) ->
5717 Errors.let_var_immutability_violation
p (Local_id.get_name
x);
5718 expr_error env p (Reason.Rwitness
p)
5721 then make_result env te ty
5722 else (* args isn't any or a variant thereof so can actually do stuff *)
5723 let env, t
= check_num
env p ty (Reason.Rarith
p) in
5725 if Env.env_local_reactive
env then
5726 Typing_mutability.handle_assignment_mutability
env te (Some
(snd
te))
5731 make_result env te (Reason.Rarith_ret_float
(p, fst t
, Reason.Aonly
), Tprim Tfloat
)
5733 make_result env te (Reason.Rarith_ret_num
(p, fst t
, Reason.Aonly
), Tprim Tnum
)
5734 | Tprim Tint
-> make_result env te (Reason.Rarith_ret_int
p, Tprim Tint
)
5735 | Tdynamic
-> make_result env te (Reason.Rincdec_dynamic
p, Tdynamic
)
5736 | _ -> make_result env te (Reason.Rarith_ret
p, Tprim Tnum
)
5741 then make_result env te ty
5742 else (* args isn't any or a variant thereof so can actually do stuff *)
5743 let env, t
= check_num
env p ty (Reason.Rarith
p) in
5747 make_result env te (Reason.Rarith_ret_float
(p, fst t
, Reason.Aonly
), Tprim Tfloat
)
5749 make_result env te (Reason.Rarith_ret_num
(p, fst t
, Reason.Aonly
), Tprim Tnum
)
5750 | Tprim Tint
-> make_result env te (Reason.Rarith_ret_int
p, Tprim Tint
)
5751 | _ -> make_result env te (Reason.Rarith_ret
p, Tprim Tnum
)
5754 if Env.env_local_reactive
env
5755 && not
(TypecheckerOptions.unsafe_rx
(Env.get_options
env))
5756 then Errors.reference_in_rx
p;
5759 then Errors.binding_ref_in_array
p
5760 else if is_func_arg
then
5762 if TypecheckerOptions.disallow_array_cell_pass_by_ref
5763 (Env.get_options
env)
5764 then match snd
te with
5765 | T.Array_get
_ -> Errors.passing_array_cell_by_ref
p
5768 else if Env.is_strict
env
5769 then Errors.reference_expr
p;
5770 (* any check omitted because would return the same anyway *)
5771 make_result env te ty
5773 (* Silencing does not change the type *)
5774 (* any check omitted because would return the same anyway *)
5775 make_result env te ty
5777 and binop
p env bop
p1 te1 ty1 p2 te2 ty2 =
5778 let make_result env te1 te2 ty =
5779 env, T.make_typed_expr
p ty (T.Binop
(bop
, te1, te2)), ty in
5780 let is_any = TUtils.is_any env in
5782 then make_result env te1 te2 ty1
5784 then make_result env te1 te2 ty2
5785 else (* args aren't any or a variant thereof so can actually do stuff *)
5788 let env, t1
= check_num
env p ty1 (Reason.Rarith
p1) in
5789 let env, t2
= check_num
env p ty2 (Reason.Rarith
p2) in
5790 (* postcondition: t1 and t2 are dynamic or subtypes of num and
5791 annotated as such, or we are e.g. HH_FIXMEing *)
5793 match snd t1
, snd t2
with
5794 | Tprim Tint
, Tprim Tint
-> make_result env te1 te2 (Reason.Rarith_ret_int
p, Tprim Tint
)
5795 | Tprim Tfloat
, _ ->
5796 make_result env te1 te2 ((Reason.Rarith_ret_float
(p, fst t1
, Reason.Afirst
)), Tprim Tfloat
)
5797 | _, Tprim Tfloat
->
5798 make_result env te1 te2 ((Reason.Rarith_ret_float
(p, fst t2
, Reason.Asecond
)),Tprim Tfloat
)
5800 make_result env te1 te2 ((Reason.Rarith_ret_num
(p, fst t1
, Reason.Afirst
)), Tprim Tnum
)
5802 make_result env te1 te2 ((Reason.Rarith_ret_num
(p, fst t2
, Reason.Asecond
)), Tprim Tnum
)
5803 | Tdynamic
, Tdynamic
-> make_result env te1 te2 (Reason.Rsum_dynamic
p, Tdynamic
)
5804 | _ -> make_result env te1 te2 (Reason.Rarith_ret
p, Tprim Tnum
)
5806 | Ast.Minus
| Ast.Star
->
5807 let env, t1
= check_num
env p ty1 (Reason.Rarith
p1) in
5808 let env, t2
= check_num
env p ty2 (Reason.Rarith
p2) in
5809 (* postcondition: t1 and t2 are dynamic or subtypes of num and
5810 annotated as such, or we are e.g. HH_FIXMEing *)
5812 match snd t1
, snd t2
with
5813 | Tprim Tint
, Tprim Tint
-> make_result env te1 te2 (Reason.Rarith_ret_int
p, Tprim Tint
)
5814 | Tprim Tfloat
, _ ->
5815 make_result env te1 te2 ((Reason.Rarith_ret_float
(p, fst t1
, Reason.Afirst
)), Tprim Tfloat
)
5816 | _, Tprim Tfloat
->
5817 make_result env te1 te2 ((Reason.Rarith_ret_float
(p, fst t2
, Reason.Asecond
)),Tprim Tfloat
)
5819 make_result env te1 te2 ((Reason.Rarith_ret_num
(p, fst t1
, Reason.Afirst
)), Tprim Tnum
)
5821 make_result env te1 te2 ((Reason.Rarith_ret_num
(p, fst t2
, Reason.Asecond
)), Tprim Tnum
)
5822 | _ -> make_result env te1 te2 (Reason.Rarith_ret
p, Tprim Tnum
)
5824 | Ast.Slash
| Ast.Starstar
->
5825 let env, t1
= check_num
env p ty1 (Reason.Rarith
p1) in
5826 let env, t2
= check_num
env p ty2 (Reason.Rarith
p2) in
5827 (* postcondition: t1 and t2 are dynamic or subtypes of num and
5828 annotated as such, or we are e.g. HH_FIXMEing *)
5829 let r = match bop
with
5830 | Ast.Slash
-> Reason.Rret_div
p
5831 | _ -> Reason.Rarith_ret
p in
5833 match snd t1
, snd t2
with
5834 | Tprim Tfloat
, _ ->
5835 make_result env te1 te2 ((Reason.Rarith_ret_float
(p, fst t1
, Reason.Afirst
)), Tprim Tfloat
)
5836 | _, Tprim Tfloat
->
5837 make_result env te1 te2 ((Reason.Rarith_ret_float
(p, fst t2
, Reason.Asecond
)), Tprim Tfloat
)
5838 | _ -> make_result env te1 te2 (r, Tprim Tnum
)
5840 | Ast.Percent
| Ast.Ltlt
| Ast.Gtgt
->
5841 let env, _ = check_int
env p ty1 (Reason.Rarith
p1) in
5842 let env, _ = check_int
env p ty2 (Reason.Rarith
p2) in
5843 (* postcondition: t1 and t2 are dynamic or int and
5844 annotated as such, or we are e.g. HH_FIXMEing *)
5845 let r = match bop
with
5846 | Ast.Percent
-> Reason.Rarith_ret_int
p
5847 | _ -> Reason.Rbitwise_ret
p in
5848 make_result env te1 te2 (r, Tprim Tint
)
5849 | Ast.Xor
| Ast.Amp
| Ast.Bar
->
5850 let env, t1
= check_int
env p ty1 (Reason.Rbitwise
p1) in
5851 let env, t2
= check_int
env p ty2 (Reason.Rbitwise
p2) in
5852 (* postcondition: t1 and t2 are dynamic or int and
5853 annotated as such, or we are e.g. HH_FIXMEing *)
5855 match snd t1
, snd t2
with
5856 | Tdynamic
, Tdynamic
-> make_result env te1 te2 (Reason.Rbitwise_dynamic
p, Tdynamic
)
5857 | _ -> make_result env te1 te2 (Reason.Rbitwise_ret
p, Tprim Tint
)
5859 | Ast.Eqeq
| Ast.Diff
->
5860 make_result env te1 te2 (Reason.Rcomp
p, Tprim Tbool
)
5861 | Ast.Eqeqeq
| Ast.Diff2
->
5862 make_result env te1 te2 (Reason.Rcomp
p, Tprim Tbool
)
5863 | Ast.Lt
| Ast.Lte
| Ast.Gt
| Ast.Gte
| Ast.Cmp
->
5864 let ty_result = match bop
with Ast.Cmp
-> Tprim Tint
| _ -> Tprim Tbool
in
5865 let ty_num = (Reason.Rcomp
p, Tprim Tnum
) in
5866 let ty_string = (Reason.Rcomp
p, Tprim Tstring
) in
5868 (Reason.Rcomp
p, Tclass
((p, SN.Classes.cDateTime
), [])) in
5869 let ty_datetimeimmutable =
5870 (Reason.Rcomp
p, Tclass
((p, SN.Classes.cDateTimeImmutable
), [])) in
5871 let ty_dynamic = (Reason.Rcomp
p, Tdynamic
) in
5873 (List.exists
tyl ~
f:(SubType.is_sub_type
env ty1))
5874 && (List.exists
tyl ~
f:(SubType.is_sub_type
env ty2)) in
5876 * Comparison here is allowed when both args are num, both string, or both
5877 * DateTime | DateTimeImmutable. Alternatively, either or both args can be
5878 * dynamic. We use both_sub to check that both arguments subtype a type.
5880 * This actually does not properly handle union types. For instance,
5881 * DateTime | DateTimeImmutable is neither a subtype of DateTime nor
5882 * DateTimeImmutable, but it will be the type of an element coming out
5883 * of a vector containing both. Further, dynamic could be comparable to
5884 * num | string | DateTime | DateTimeImmutable | dynamic. Better union
5885 * handling would be an improvement.
5887 if not
(both_sub [ty_num; ty_dynamic] || both_sub [ty_string; ty_dynamic] ||
5888 both_sub [ty_datetime; ty_datetimeimmutable; ty_dynamic])
5890 let ty1 = Typing_expand.fully_expand
env ty1 in
5891 let ty2 = Typing_expand.fully_expand
env ty2 in
5892 let tys1 = Typing_print.error (snd
ty1) in
5893 let tys2 = Typing_print.error (snd
ty2) in
5894 Errors.comparison_invalid_types
p
5895 (Reason.to_string
("This is " ^
tys1) (fst
ty1))
5896 (Reason.to_string
("This is " ^
tys2) (fst
ty2))
5898 make_result env te1 te2 (Reason.Rcomp
p, ty_result)
5900 (* A bit weird, this one:
5901 * function(Stringish | string, Stringish | string) : string)
5903 let env = SubType.sub_string
p1 env ty1 in
5904 let env = SubType.sub_string
p2 env ty2 in
5905 make_result env te1 te2 (Reason.Rconcat_ret
p, Tprim Tstring
)
5906 | Ast.Barbar
| Ast.Ampamp
| Ast.LogXor
->
5907 make_result env te1 te2 (Reason.Rlogic_ret
p, Tprim Tbool
)
5908 | Ast.QuestionQuestion
5912 and make_a_local_of
env e =
5914 | p, Class_get
((_, cname
), (_, member_name
)) ->
5915 let env, local = Env.FakeMembers.make_static
p env cname member_name
in
5916 env, Some
(p, local)
5917 | p, Obj_get
((_, This
| _, Lvar
_ as obj
), (_, Id
(_, member_name
)), _) ->
5918 let env, local = Env.FakeMembers.make
p env obj member_name
in
5919 env, Some
(p, local)
5922 | _, Dollardollar
x -> env, Some
x
5925 (* This function captures the common bits of logic behind refinement
5926 * of the type of a local variable or a class member variable as a
5927 * result of a dynamic check (e.g., nullity check, simple type check
5928 * using functions like is_int, is_string, is_array etc.). The
5929 * argument refine is a function that takes the type of the variable
5930 * and returns a refined type (making necessary changes to the
5931 * environment, which is threaded through).
5933 and refine_lvalue_type
env ((_p
, ty), _ as te) ~refine
=
5934 let env, ty = refine
env ty in
5935 let e = T.to_nast_expr
te in
5936 let env, localopt
= make_a_local_of
env e in
5937 (* TODO TAST: generate an assignment to the fake local in the TAST *)
5940 set_local
env local ty
5943 and condition_nullity ~nonnull
(env: Env.env) te =
5945 (* assignment: both the rhs and lhs of the '=' must be made null/non-null *)
5946 | _, T.Binop
(Ast.Eq None
, var
, te) ->
5947 let env = condition_nullity ~nonnull
env te in
5948 condition_nullity ~nonnull
env var
5949 (* case where `Shapes::idx(...)` must be made null/non-null *)
5952 (_, T.Class_const
((_, T.CI
((_, shapes
), _)), (_, idx))),
5956 when shapes
= SN.Shapes.cShapes
&& idx = SN.Shapes.idx ->
5957 let field = T.to_nast_expr
field in
5958 let refine env shape_ty
= if nonnull
5959 then Typing_shapes.shapes_idx_not_null
env shape_ty
field
5960 else env, shape_ty
in
5961 refine_lvalue_type
env shape ~
refine
5963 let refine env ty = if nonnull
5964 then TUtils.non_null
env ty
5966 refine_lvalue_type
env te ~
refine
5968 and condition_isset
env = function
5969 | _, T.Array_get
(x, _) -> condition_isset
env x
5970 | v
-> condition_nullity ~nonnull
:true env v
5973 * Build an environment for the true or false branch of
5974 * conditional statements.
5976 and condition ?lhs_of_null_coalesce
env tparamet
5977 ((p, ty as pty
), e as te: Tast.expr
) =
5978 Async.enforce_nullable_or_not_awaitable
env p ty;
5979 let condition = condition ?lhs_of_null_coalesce
in
5982 | T.Expr_list
[] when not tparamet
->
5983 LEnv.drop_cont
env C.Next
5984 | T.False
when tparamet
->
5985 LEnv.drop_cont
env C.Next
5986 | T.Expr_list
[] -> env
5987 | T.Expr_list
[x] ->
5988 condition env tparamet
x
5989 | T.Expr_list
(_::xs
) ->
5990 condition env tparamet
(pty
, T.Expr_list xs
)
5991 | T.Call
(Cnormal
, (_, T.Id
(_, func
)), _, [param], [])
5992 when SN.PseudoFunctions.isset
= func
&& tparamet
&&
5993 not
(Env.is_strict
env) ->
5994 condition_isset
env param
5995 | T.Call
(Cnormal
, (_, T.Id
(_, func
)), _, [te], [])
5996 when SN.StdlibFunctions.is_null
= func
->
5997 condition_nullity ~nonnull
:(not tparamet
) env te
5998 | T.Binop
((Ast.Eqeq
| Ast.Eqeqeq
), (_, T.Null
), e)
5999 | T.Binop
((Ast.Eqeq
| Ast.Eqeqeq
), e, (_, T.Null
)) ->
6000 condition_nullity ~nonnull
:(not tparamet
) env e
6001 | (T.Lvar
_ | T.Obj_get
_ | T.Class_get
_ | T.Binop
(Ast.Eq None
, _, _)) ->
6002 let env, ety
= Env.expand_type
env ty in
6004 | _, Tarraykind
(AKany
| AKempty
)
6005 | _, Tprim Tbool
-> env
6006 | _, (Terr
| Tany
| Tmixed
| Tnonnull
| Tarraykind
_ | Toption
_ | Tdynamic
6007 | Tprim
_ | Tvar
_ | Tfun
_ | Tabstract
(_, _) | Tclass
(_, _)
6008 | Ttuple
_ | Tanon
(_, _) | Tunresolved
_ | Tobject
| Tshape
_
6010 condition_nullity ~nonnull
:tparamet
env te)
6011 | T.Binop
((Ast.Diff
| Ast.Diff2
as op
), e1
, e2
) ->
6012 let op = if op = Ast.Diff
then Ast.Eqeq
else Ast.Eqeqeq
in
6013 condition env (not tparamet
) (pty
, T.Binop
(op, e1
, e2
))
6014 | T.Id
(_, s) when s = SN.Rx.is_enabled
->
6015 (* when Rx\IS_ENABLED is false - switch env to non-reactive *)
6017 then Env.set_env_reactive
env Nonreactive
6019 | T.Binop
((Ast.Ampamp
| Ast.Barbar
) as bop
, e1
, e2
)
6020 when tparamet
= (bop
= Ast.Ampamp
) ->
6021 let env = condition env tparamet e1
in
6022 (* This is necessary in case there is an assignment in e2
6023 * We essentially redo what has been undone in the
6024 * `Binop (AMpamp|BArbar)` case of `expr` *)
6025 let env, _, _ = expr
env (Tast.to_nast_expr e2
) in
6026 let env = condition env tparamet e2
in
6028 | T.Call
(Cnormal
, ((p, _), T.Id
(_, f)), _, [lv
], [])
6029 when tparamet
&& f = SN.StdlibFunctions.is_array
->
6030 is_array
env `PHPArray
p f lv
6033 (_, T.Class_const
((_, T.CI
((_, class_name), _)), (_, method_name
))),
6037 when tparamet
&& class_name = SN.Shapes.cShapes
&& method_name
= SN.Shapes.keyExists
->
6038 key_exists
env shape
field
6039 | T.Unop
(Ast.Unot
, e) ->
6040 condition env (not tparamet
) e
6041 | T.InstanceOf
(ivar
, (_, cid))
6042 when tparamet
&& is_instance_var
(T.to_nast_expr ivar
) ->
6043 let ivar = T.to_nast_expr
ivar in
6044 (* Check the expession and determine its static type *)
6045 let env, _te
, x_ty
= raw_expr
env ivar in
6047 (* What is the local variable bound to the expression? *)
6048 let env, ((ivar_pos
, _) as ivar) = get_instance_var
env ivar in
6050 (* The position p here is not really correct... it's the position
6051 * of the instanceof expression, not the class id. But we don't store
6052 * position data for the latter. *)
6053 let env, _te
, obj_ty = static_class_id ~check_constraints
:false p env
6054 (T.to_nast_class_id_
cid) in
6056 if SubType.is_sub_type
env obj_ty (
6057 Reason.none
, Tclass
((Pos.none
, SN.Classes.cAwaitable
), [Reason.none
, Typing_utils.tany env])
6058 ) then () else Async.enforce_nullable_or_not_awaitable
env (fst
ivar) x_ty
;
6060 let safe_instanceof_enabled =
6061 TypecheckerOptions.experimental_feature_enabled
6062 (Env.get_options
env) TypecheckerOptions.experimental_instanceof
in
6063 let rec resolve_obj env obj_ty =
6064 (* Expand so that we don't modify x *)
6065 let env, obj_ty = Env.expand_type
env obj_ty in
6067 (* If it's a generic that's expression dependent, we need to
6068 look at all of its upper bounds and create an unresolved type to
6069 represent all of the possible types.
6071 | r, Tabstract
(AKgeneric
s, _) when AbstractKind.is_generic_dep_ty
s ->
6072 let upper_bounds = TySet.elements
(Env.get_upper_bounds
env s) in
6073 let env, tyl = List.map_env
env upper_bounds resolve_obj in
6074 env, (r, Tunresolved
tyl)
6075 | _, Tabstract
(AKgeneric
name, _) ->
6076 if safe_instanceof_enabled
6077 then Errors.instanceof_generic_classname
p name;
6079 | _, Tabstract
(AKdependent
(`this
, []), Some
(_, Tclass
_)) ->
6081 (* Technically instanceof static is not strong enough to prove
6082 * that a type is exactly the same as the late bound type.
6083 * For now we allow this lie to exist. To solve
6084 * this we either need to create a new type that means
6085 * subtype of static or provide a way of specifying exactly
6086 * the late bound type i.e. $x::class === static::class
6088 if cid = T.CIstatic
then
6089 ExprDepTy.make
env CIstatic
obj_ty
6093 | _, Tabstract
((AKdependent
_ | AKnewtype
_), Some
ty) ->
6095 | _, Tclass
((_, cid as _c
), tyl) ->
6096 begin match Env.get_class
env cid with
6097 (* Why would this happen? *)
6099 env, (Reason.Rwitness ivar_pos
, Tobject
)
6101 | Some
class_info ->
6102 if SubType.is_sub_type
env x_ty
obj_ty
6104 (* If the right side of the `instanceof` object is
6105 * a super type of what we already knew. In this case,
6106 * since we already have a more specialized object, we
6107 * don't touch the original object. Check out the unit
6108 * test srecko.php if this is unclear.
6110 * Note that if x_ty is Typing_utils.tany env, no amount of subtype
6111 * checking will be able to specify it
6112 * further. This is arguably desirable to maintain
6113 * the invariant that removing annotations gets rid
6114 * of typing errors in partial mode (See also
6118 (* We only implement the safe instanceof in strict mode *)
6119 (* Also: for generic types we implememt it only with
6120 * experimental feature enabled *)
6121 if Env.is_strict
env && (tyl = [] || safe_instanceof_enabled)
6122 then safe_instanceof
env p _c
class_info ivar_pos x_ty
obj_ty
6125 | r, Tunresolved
tyl ->
6126 let env, tyl = List.map_env
env tyl resolve_obj in
6127 env, (r, Tunresolved
tyl)
6128 | _, (Terr
| Tany
| Tmixed
| Tnonnull
| Tarraykind
_ | Tprim
_ | Tvar
_
6129 | Tfun
_ | Tabstract
((AKenum
_ | AKnewtype
_ | AKdependent
_), _)
6130 | Ttuple
_ | Tanon
(_, _) | Toption
_ | Tobject
| Tshape
_
6132 env, (Reason.Rwitness ivar_pos
, Tobject
)
6134 let env, x_ty
= resolve_obj env obj_ty in
6135 set_local
env ivar x_ty
6136 | T.Is
(ivar, h) when tparamet
&& is_instance_var
(T.to_nast_expr
ivar) ->
6137 let ivar = T.to_nast_expr
ivar in
6138 (* Check the expession and determine its static type *)
6139 let env, _te
, ivar_ty
= raw_expr
env ivar in
6140 (* What is the local variable bound to the expression? *)
6141 let env, ((ivar_pos
, _) as ivar) = get_instance_var
env ivar in
6142 (* Resolve the typehint to a type *)
6143 let ety_env = { (Phase.env_with_self
env) with from_class
= Some CIstatic
; } in
6144 let env, hint_ty = Phase.localize_hint ~
ety_env env h in
6145 let reason = Reason.Ris ivar_pos
in
6146 (* Expand so that we don't modify ivar *)
6147 let env, hint_ty = Env.expand_type
env hint_ty in
6149 if snd
hint_ty <> Tdynamic
&& SubType.is_sub_type
env ivar_ty
hint_ty
6151 else safely_refine_type
env p reason ivar_pos ivar_ty
hint_ty in
6152 set_local
env ivar hint_ty
6155 and safely_refine_type
env p reason ivar_pos ivar_ty
hint_ty =
6156 match snd ivar_ty
, snd
hint_ty with
6157 | _, Tclass
((_, cid) as _c
, tyl) ->
6158 begin match Env.get_class
env cid with
6159 | Some
class_info ->
6160 let env, tparams_with_new_names
, tyl_fresh
=
6161 isexpr_generate_fresh_tparams
env class_info reason tyl in
6162 safely_refine_class_type
6163 env p _c
class_info ivar_ty
hint_ty tparams_with_new_names
6166 env, (Reason.Rwitness ivar_pos
, Tobject
)
6168 | Ttuple ivar_tyl
, Ttuple hint_tyl
6169 when (List.length ivar_tyl
) = (List.length hint_tyl
) ->
6171 List.map2_env
env ivar_tyl hint_tyl
begin fun env ivar_ty
hint_ty ->
6172 safely_refine_type
env p reason ivar_pos ivar_ty
hint_ty
6175 env, (reason, Ttuple
tyl)
6177 TUtils.non_null
env ivar_ty
6178 | _, Tabstract
(AKdependent
(`this
, []), Some
(_, Tclass
_)) ->
6179 ExprDepTy.make
env CIstatic
hint_ty
6180 | _, (Tany
| Tmixed
| Tprim
_ | Toption
_ | Ttuple
_
6181 | Tshape
_ | Tvar
_ | Tabstract
_ | Tarraykind
_ | Tanon
_
6182 | Tunresolved
_ | Tobject
| Terr
| Tfun
_ | Tdynamic
) ->
6183 (* TODO(kunalm) Implement the type refinement for each type *)
6186 and safe_instanceof
env p class_name class_info ivar_pos ivar_ty
obj_ty =
6187 (* Generate fresh names consisting of formal type parameter name
6188 * with unique suffix *)
6189 let env, tparams_with_new_names
=
6190 List.map_env
env class_info.tc_tparams
6191 (fun env ((_, (_,name), _, _) as tp
) ->
6192 let env, name = Env.add_fresh_generic_parameter
env name in
6193 env, Some
(tp
, name)) in
6194 let new_names = List.map
6195 ~
f:(fun x -> snd
@@ Option.value_exn
x)
6196 tparams_with_new_names
in
6198 snd
class_name ^
"<" ^
6199 String.concat ~sep
:"," new_names
6201 let reason = Reason.Rinstanceof
(ivar_pos
, s) in
6202 let tyl_fresh = List.map
6203 ~
f:(fun new_name
-> (reason, Tabstract
(AKgeneric new_name
, None
)))
6206 safely_refine_class_type
6207 env p class_name class_info ivar_ty
obj_ty tparams_with_new_names
tyl_fresh in
6210 and isexpr_generate_fresh_tparams
env class_info reason hint_tyl
=
6211 let tparams_len = List.length
class_info.tc_tparams
in
6212 let hint_tyl = List.take
hint_tyl tparams_len in
6213 let pad_len = tparams_len - (List.length
hint_tyl) in
6215 List.map
hint_tyl (fun x -> Some
x) @ (List.init
pad_len (fun _ -> None
)) in
6216 let replace_wildcard env hint_ty ((_, (_, tparam_name
), _, _) as tp
) =
6218 | Some
(_, Tabstract
(AKgeneric
name, _))
6219 when Env.is_fresh_generic_parameter
name ->
6220 env, (Some
(tp
, name), (reason, Tabstract
(AKgeneric
name, None
)))
6224 let env, new_name
= Env.add_fresh_generic_parameter
env tparam_name
in
6225 env, (Some
(tp
, new_name
), (reason, Tabstract
(AKgeneric new_name
, None
)))
6227 let env, tparams_and_tyl
= List.map2_env
env hint_tyl class_info.tc_tparams
6228 ~
f:replace_wildcard in
6229 let tparams_with_new_names, tyl_fresh = List.unzip tparams_and_tyl
in
6230 env, tparams_with_new_names, tyl_fresh
6232 and safely_refine_class_type
6233 env p class_name class_info ivar_ty
obj_ty tparams_with_new_names tyl_fresh =
6234 (* Type of variable in block will be class name
6235 * with fresh type parameters *)
6236 let obj_ty = (fst
obj_ty, Tclass
(class_name, tyl_fresh)) in
6238 (* Add in constraints as assumptions on those type parameters *)
6240 type_expansions
= [];
6241 substs
= Subst.make
class_info.tc_tparams
tyl_fresh;
6242 this_ty = obj_ty; (* In case `this` appears in constraints *)
6244 validate_dty
= None
;
6246 let add_bounds env ((_, _, cstr_list
, _), ty_fresh
) =
6247 List.fold_left cstr_list ~init
:env ~
f:begin fun env (ck
, ty) ->
6248 (* Substitute fresh type parameters for
6249 * original formals in constraint *)
6250 let env, ty = Phase.localize ~
ety_env env ty in
6251 SubType.add_constraint
p env ck ty_fresh
ty end in
6253 List.fold_left
(List.zip_exn
class_info.tc_tparams
tyl_fresh)
6254 ~
f:add_bounds ~init
:env in
6256 (* Finally, if we have a class-test on something with static class type,
6257 * then we can chase the hierarchy and decompose the types to deduce
6258 * further assumptions on type parameters. For example, we might have
6259 * class B<Tb> { ... }
6260 * class C extends B<int>
6261 * and have obj_ty = C and x_ty = B<T> for a generic parameter T.
6262 * Then SubType.add_constraint will deduce that T=int and add int as
6263 * both lower and upper bound on T in env.lenv.tpenv
6265 let env = SubType.add_constraint
p env Ast.Constraint_as
obj_ty ivar_ty
in
6267 (* It's often the case that the fresh name isn't necessary. For
6268 * example, if C<T> extends B<T>, and we have $x:B<t> for some type t
6269 * then $x instanceof B should refine to $x:C<t>.
6270 * We take a simple approach:
6271 * For a fresh type parameter T#1, if
6272 * 1) There is an eqality constraint T#1 = t then replace T#1 with t.
6273 * 2) T#1 is covariant, and T#1 <: t and occurs nowhere else in the constraints
6274 * 3) T#1 is contravariant, and t <: T#1 and occurs nowhere else in the constraints
6276 let tparams_in_constraints = Env.get_tpenv_tparams
env in
6277 let tyl_fresh_simplified =
6278 List.map2_exn
tparams_with_new_names tyl_fresh
6279 ~
f:begin fun x y
-> match x, y
with
6280 | Some
((variance
, _, _, _), newname
), ty_fresh
->
6281 begin match variance
,
6282 TySet.elements
(Env.get_lower_bounds
env newname
),
6283 TySet.elements
(Env.get_equal_bounds
env newname
),
6284 TySet.elements
(Env.get_upper_bounds
env newname
) with
6285 (* Special case for mixed=?nonnull as a lower bound *)
6286 | _, [(_, Toption
(_, Tnonnull
)) as ty], _, _ -> ty
6287 | _, [(_, Tmixed
) as ty], _, _ -> ty
6288 | _, _, [ty], _ -> ty
6289 | Ast.Covariant
, _, _, [ty]
6290 | Ast.Contravariant
, [ty], _, _
6291 when not
(SSet.mem newname
tparams_in_constraints) -> ty
6292 | _, _, _, _ -> ty_fresh
6294 | None
, ty_fresh
-> ty_fresh
6296 let obj_ty_simplified = (fst
obj_ty, Tclass
(class_name, tyl_fresh_simplified)) in
6297 env, obj_ty_simplified
6299 and is_instance_var
= function
6300 | _, (Lvar
_ | This
| Dollardollar
_) -> true
6301 | _, Obj_get
((_, This
), (_, Id
_), _) -> true
6302 | _, Obj_get
((_, Lvar
_), (_, Id
_), _) -> true
6303 | _, Class_get
(_, _) -> true
6306 and get_instance_var
env = function
6307 | p, Class_get
((_, cname
), (_, member_name
)) ->
6308 let env, local = Env.FakeMembers.make_static
p env cname member_name
in
6310 | p, Obj_get
((_, This
| _, Lvar
_ as obj
), (_, Id
(_, member_name
)), _) ->
6311 let env, local = Env.FakeMembers.make
p env obj member_name
in
6313 | _, Dollardollar
(p, x)
6314 | _, Lvar
(p, x) -> env, (p, x)
6315 | p, This
-> env, (p, this
)
6316 | _ -> failwith
"Should only be called when is_instance_var is true"
6318 (* Refine type for is_array, is_vec, is_keyset and is_dict tests
6319 * `pred_name` is the function name itself (e.g. 'is_vec')
6320 * `p` is position of the function name in the source
6321 * `arg_expr` is the argument to the function
6323 and is_array
env ty p pred_name arg_expr
=
6324 refine_lvalue_type
env arg_expr ~
refine:begin fun env arg_ty
->
6325 let r = Reason.Rpredicated
(p, pred_name
) in
6326 let env, tarrkey_name
= Env.add_fresh_generic_parameter
env "Tk" in
6327 let tarrkey = (r, Tabstract
(AKgeneric tarrkey_name
, None
)) in
6328 let env = SubType.add_constraint
p env Ast.Constraint_as
6329 tarrkey (r, Tprim Tarraykey
) in
6330 let env, tfresh_name
= Env.add_fresh_generic_parameter
env "T" in
6331 let tfresh = (r, Tabstract
(AKgeneric tfresh_name
, None
)) in
6332 (* This is the refined type of e inside the branch *)
6333 let refined_ty = (r,
6336 Tclass
((Pos.none
, SN.Collections.cDict
), [tarrkey; tfresh])
6338 Tclass
((Pos.none
, SN.Collections.cVec
), [tfresh])
6340 Tclass
((Pos.none
, SN.Collections.cKeyset
), [tarrkey])
6342 let safe_isarray_enabled =
6343 TypecheckerOptions.experimental_feature_enabled
6344 (Env.get_options
env) TypecheckerOptions.experimental_isarray
in
6345 if safe_isarray_enabled
6346 then Tarraykind
(AKvarray_or_darray
tfresh)
6347 else Tarraykind AKany
) in
6348 (* Add constraints on generic parameters that must
6349 * hold for refined_ty <:arg_ty. For example, if arg_ty is Traversable<T>
6350 * and refined_ty is keyset<T#1> then we know T#1 <: T *)
6351 let env = SubType.add_constraint
p env Ast.Constraint_as
refined_ty arg_ty
in
6355 and key_exists
env shape
field =
6356 let field = T.to_nast_expr
field in
6357 refine_lvalue_type
env shape ~
refine:begin fun env shape_ty
->
6358 match TUtils.shape_field_name
env field with
6359 | None
-> env, shape_ty
6360 | Some
field_name -> Typing_shapes.refine_shape
field_name env shape_ty
6363 and string2
env idl
=
6365 List.fold_left idl ~init
:(env,[]) ~
f:begin fun (env,tel) x ->
6366 let env, te, ty = expr
env x in
6368 let env = SubType.sub_string
p env ty in
6373 (* If the current class inherits from classes that take type arguments, we need
6374 * to check that the arguments provided are consistent with the constraints on
6375 * the type parameters. *)
6376 and check_implements_tparaml
(env: Env.env) ht
=
6377 let _r, (p, c), paraml = TUtils.unwrap_class_type ht
in
6378 let class_ = Decl_env.get_class_dep
env.Env.decl_env
c in
6381 (* The class lives in PHP land *)
6384 let size1 = List.length
class_.dc_tparams
in
6385 let size2 = List.length
paraml in
6386 if size1 <> size2 then Errors.class_arity
p class_.dc_pos
c size1;
6387 let subst = Inst.make_subst
class_.dc_tparams
paraml in
6388 iter2_shortest
begin fun (_, (p, _), cstrl
, _) ty ->
6389 List.iter cstrl
begin fun (ck
, cstr) ->
6390 (* Constraint might contain uses of generic type parameters *)
6391 let cstr = Inst.instantiate
subst cstr in
6393 | Ast.Constraint_as
->
6394 Type.sub_type_decl
p Reason.URnone
env ty cstr
6395 | Ast.Constraint_eq
->
6396 (* This code could well be unreachable, because we don't allow
6397 * equality constraints on class generics. *)
6398 Type.sub_type_decl
p Reason.URnone
env ty cstr;
6399 Type.sub_type_decl
p Reason.URnone
env cstr ty
6400 | Ast.Constraint_super
->
6401 Type.sub_type_decl
p Reason.URnone
env cstr ty
6403 end class_.dc_tparams
paraml
6405 (* In order to type-check a class, we need to know what "parent"
6406 * refers to. Sometimes people write "parent::", when that happens,
6407 * we need to know the type of parent.
6409 and class_def_parent
env class_def class_type
=
6410 match class_def
.c_extends
with
6411 | (_, Happly
((_, x), _) as parent_ty
) :: _ ->
6412 let parent_type = Decl_env.get_class_dep
env.Env.decl_env
x in
6413 (match parent_type with
6414 | Some
parent_type -> check_parent class_def class_type
parent_type
6416 let parent_ty = Decl_hint.hint
env.Env.decl_env
parent_ty in
6417 env, Some
x, parent_ty
6418 (* The only case where we have more than one parent class is when
6419 * dealing with interfaces and interfaces cannot use parent.
6422 | _ -> env, None
, (Reason.Rnone
, Typing_utils.tany env)
6424 and check_parent class_def class_type
parent_type =
6425 let position = fst class_def
.c_name
in
6426 if class_type
.tc_const
&& not
parent_type.dc_const
6427 then Errors.self_const_parent_not
position;
6428 if parent_type.dc_const
&& not class_type
.tc_const
6429 then Errors.parent_const_self_not
position;
6430 (* Are all the parents in Hack? Do we know all their methods?
6431 * If so, let's check that the abstract methods have been implemented.
6433 if class_type
.tc_members_fully_known
6434 then check_parent_abstract
position parent_type class_type
;
6435 if parent_type.dc_final
6436 then Errors.extend_final
position parent_type.dc_pos
parent_type.dc_name
6439 and check_parent_sealed child_type
parent_type =
6440 match parent_type.dc_sealed_whitelist
with
6443 let parent_pos = parent_type.dc_pos
in
6444 let parent_name = parent_type.dc_name
in
6445 let child_pos = child_type
.tc_pos
in
6446 let child_name = child_type
.tc_name
in
6447 let check kind action
=
6448 if not
(SSet.mem
child_name whitelist
)
6449 then Errors.extend_sealed
child_pos parent_pos parent_name kind action
in
6450 begin match parent_type.dc_kind
, child_type
.tc_kind
with
6451 | Ast.Cinterface
, Ast.Ctrait
->
6452 Errors.trait_implement_sealed
child_pos parent_pos parent_name
6453 | Ast.Cinterface
, Ast.Cinterface
-> check "interface" "extend"
6454 | Ast.Cinterface
, _ -> check "interface" "implement"
6455 | Ast.Ctrait
, _ -> check "trait" "use"
6457 | Ast.Cnormal
, _ -> check "class" "extend"
6458 | Ast.Cenum
, _ -> ()
6461 and check_parents_sealed
env child_def child_type
=
6462 let parents = child_def
.c_extends
@ child_def
.c_implements
@ child_def
.c_uses
in
6463 List.iter parents begin function
6464 | _, Happly
((_, name), _) ->
6465 begin match Decl_env.get_class_dep
env.Env.decl_env
name with
6466 | Some
parent_type -> check_parent_sealed child_type
parent_type
6472 and check_parent_abstract
position parent_type class_type
=
6473 let is_final = class_type
.tc_final
in
6474 if parent_type.dc_kind
= Ast.Cabstract
&&
6475 (class_type
.tc_kind
<> Ast.Cabstract
|| is_final)
6477 check_extend_abstract_meth ~
is_final position class_type
.tc_methods
;
6478 check_extend_abstract_meth ~
is_final position class_type
.tc_smethods
;
6479 check_extend_abstract_const ~
is_final position class_type
.tc_consts
;
6480 check_extend_abstract_typeconst
6481 ~
is_final position class_type
.tc_typeconsts
;
6484 and class_def
tcopt c =
6485 let env = EnvFromDef.class_env
tcopt c in
6486 let tc = Env.get_class
env (snd
c.c_name
) in
6487 add_decl_errors
(Option.(map
tc (fun tc -> value_exn
tc.tc_decl_errors
)));
6488 let c = TNBody.class_meth_bodies
tcopt c in
6489 if not
!auto_complete
then begin
6490 NastCheck.class_ env c;
6491 NastInitCheck.class_ env c;
6495 (* This can happen if there was an error during the declaration
6499 Typing_requirements.check_class
env tc;
6500 Some
(class_def_
env c tc)
6502 and class_def_
env c tc =
6504 let kind = match c.c_kind
with
6505 | Ast.Cenum
-> SN.AttributeKinds.enum
6506 | _ -> SN.AttributeKinds.cls
in
6507 Typing_attributes.check_def
env new_object
kind c.c_user_attributes
in
6509 { env with Env.inside_ppl_class
=
6510 Attributes.mem
SN.UserAttributes.uaProbabilisticModel
c.c_user_attributes
6512 let pc, _ = c.c_name
in
6514 (c.c_extends
@ c.c_implements
@ c.c_uses
)
6515 (Decl_hint.hint
env.Env.decl_env
) in
6516 TI.check_tparams_instantiable
env (fst
c.c_tparams
);
6517 let env, constraints
=
6518 Phase.localize_generic_parameters_with_bounds
env (fst
c.c_tparams
)
6519 ~
ety_env:(Phase.env_with_self
env) in
6520 let env = add_constraints
(fst
c.c_name
) env constraints
in
6521 Typing_variance.class_ (Env.get_options
env) (snd
c.c_name
) tc impl;
6522 List.iter impl (check_implements_tparaml
env);
6523 check_parents_sealed
env c tc;
6525 let env, parent_id
, parent = class_def_parent
env c tc in
6526 let is_final = tc.tc_final
in
6527 if (tc.tc_kind
= Ast.Cnormal
|| is_final) && tc.tc_members_fully_known
6529 check_extend_abstract_meth ~
is_final pc tc.tc_methods
;
6530 check_extend_abstract_meth ~
is_final pc tc.tc_smethods
;
6531 check_extend_abstract_const ~
is_final pc tc.tc_consts
;
6532 check_extend_abstract_typeconst ~
is_final pc tc.tc_typeconsts
;
6534 let env = Env.set_parent
env parent in
6535 let env = match parent_id
with
6537 | Some parent_id
-> Env.set_parent_id
env parent_id
in
6538 if tc.tc_final
then begin
6540 | Ast.Cinterface
-> Errors.interface_final
(fst
c.c_name
)
6541 | Ast.Cabstract
-> ()
6542 | Ast.Ctrait
-> Errors.trait_final
(fst
c.c_name
)
6544 Errors.internal_error
pc "The parser should not parse final on enums"
6547 SMap.iter (check_static_class_element
tc.tc_methods ~elt_type
:"method") tc.tc_smethods
;
6548 SMap.iter (check_static_class_element
tc.tc_props ~elt_type
:"property") tc.tc_sprops
;
6549 List.iter impl (class_implements_type
env c);
6550 if tc.tc_is_disposable
6551 then List.iter (c.c_extends
@ c.c_uses
) (Typing_disposable.enforce_is_disposable
env);
6552 let typed_vars = List.map
c.c_vars
(class_var_def
env ~is_static
:false c) in
6553 let typed_methods = List.map
c.c_methods
(method_def
env) in
6554 let typed_typeconsts = List.map
c.c_typeconsts
(typeconst_def
env) in
6555 let typed_consts, const_types
=
6556 List.unzip
(List.map
c.c_consts
(class_const_def
env)) in
6557 let env = Typing_enum.enum_class_check
env tc c.c_consts const_types
in
6558 let typed_constructor = class_constr_def
env c in
6559 let env = Env.set_static
env in
6560 let typed_static_vars =
6561 List.map
c.c_static_vars
(class_var_def
env ~is_static
:true c) in
6562 let typed_static_methods = List.map
c.c_static_methods
(method_def
env) in
6564 T.c_annotation
= Env.save
env.Env.lenv.Env.tpenv
env;
6565 T.c_mode
= c.c_mode
;
6566 T.c_final
= c.c_final
;
6567 T.c_is_xhp
= c.c_is_xhp
;
6568 T.c_kind
= c.c_kind
;
6569 T.c_name
= c.c_name
;
6570 T.c_tparams
= c.c_tparams
;
6571 T.c_extends
= c.c_extends
;
6572 T.c_uses
= c.c_uses
;
6573 T.c_xhp_attr_uses
= c.c_xhp_attr_uses
;
6574 T.c_xhp_category
= c.c_xhp_category
;
6575 T.c_req_extends
= c.c_req_extends
;
6576 T.c_req_implements
= c.c_req_implements
;
6577 T.c_implements
= c.c_implements
;
6578 T.c_consts
= typed_consts;
6579 T.c_typeconsts
= typed_typeconsts;
6580 T.c_static_vars
= typed_static_vars;
6581 T.c_vars
= typed_vars;
6582 T.c_constructor
= typed_constructor;
6583 T.c_static_methods
= typed_static_methods;
6584 T.c_methods
= typed_methods;
6585 T.c_user_attributes
= List.map
c.c_user_attributes
(user_attribute
env);
6586 T.c_namespace
= c.c_namespace
;
6587 T.c_enum
= c.c_enum
;
6590 and check_static_class_element obj element_name static_element ~elt_type
=
6591 (* The static properties that we get passed in start with '$', but the
6592 non-static properties we're matching against don't, so we need to detect
6593 that and remove it if present. *)
6594 let element_name = String_utils.lstrip
element_name "$" in
6595 if SMap.mem
element_name obj
6597 let lazy (static_element_reason
, _) = static_element
.ce_type
in
6598 let dyn_element = SMap.find_unsafe
element_name obj
in
6599 let lazy (dyn_element_reason
, _) = dyn_element.ce_type
in
6600 Errors.static_dynamic
6601 (Reason.to_pos static_element_reason
)
6602 (Reason.to_pos dyn_element_reason
)
6608 and check_extend_abstract_meth ~
is_final p smap
=
6609 SMap.iter begin fun x ce
->
6610 match ce
.ce_type
with
6611 | lazy (r, Tfun
{ ft_abstract
= true; _ }) ->
6612 Errors.implement_abstract ~
is_final p (Reason.to_pos
r) "method" x
6616 (* Type constants must be bound to a concrete type for non-abstract classes.
6618 and check_extend_abstract_typeconst ~
is_final p smap
=
6619 SMap.iter begin fun x tc ->
6620 if tc.ttc_type
= None
then
6621 Errors.implement_abstract ~
is_final p (fst
tc.ttc_name
) "type constant" x
6624 and check_extend_abstract_const ~
is_final p smap
=
6625 SMap.iter begin fun x cc
->
6626 match cc
.cc_type
with
6627 | r, _ when cc
.cc_abstract
&& not cc
.cc_synthesized
->
6628 Errors.implement_abstract ~
is_final p (Reason.to_pos
r) "constant" x
6639 | Tvarray_or_darray
_
6652 and typeconst_def
env {
6653 c_tconst_name
= (pos, _) as id;
6654 c_tconst_constraint
;
6657 let env, cstr = opt
Phase.localize_hint_with_self
env c_tconst_constraint
in
6658 let env, ty = opt
Phase.localize_hint_with_self
env c_tconst_type
in
6660 Option.map2
ty cstr ~
f:(Type.sub_type
pos Reason.URtypeconst_cstr
env)
6663 T.c_tconst_name
= id;
6664 T.c_tconst_constraint
= c_tconst_constraint
;
6665 T.c_tconst_type
= c_tconst_type
;
6668 and class_const_def
env (h, id, e) =
6669 let env, ty, opt_expected
=
6671 | None
-> env, Env.fresh_type
(), None
6673 let env, ty = Phase.localize_hint_with_self
env h in
6674 env, ty, Some
(fst
id, Reason.URhint
, ty)
6678 let env, te, ty'
= expr ?
expected:opt_expected
env e in
6679 ignore
(Type.coerce_type
(fst
id) Reason.URhint
env ty'
ty);
6680 (h, id, Some
te), ty'
6684 and class_constr_def
env c =
6685 let env = { env with Env.inside_constructor
= true } in
6686 Option.map
c.c_constructor
(method_def
env)
6688 and class_implements_type
env c1 ctype2
=
6690 List.map
(fst c1
.c_tparams
) begin fun (_, (p, s), _, _) ->
6691 (Reason.Rwitness
p, Tgeneric
s)
6693 let r = Reason.Rwitness
(fst c1
.c_name
) in
6694 let ctype1 = r, Tapply
(c1
.c_name
, params) in
6695 Typing_extends.check_implements
env ctype2
ctype1;
6698 (* Type-check a property declaration, with optional initializer *)
6699 and class_var_def
env ~is_static
c cv
=
6700 (* First pick up and localize the hint if it exists *)
6702 match cv
.cv_type
with
6705 | Some
(p, _ as cty
) ->
6707 (* If this is an XHP attribute and we're in strict mode,
6708 relax to partial mode to allow the use of the "array"
6709 annotation without specifying type parameters. Until
6710 recently HHVM did not allow "array" with type parameters
6711 in XHP attribute declarations, so this is a temporary
6712 hack to support existing code for now. *)
6713 (* Task #5815945: Get rid of this Hack *)
6714 if cv
.cv_is_xhp
&& (Env.is_strict
env)
6715 then Env.set_mode
env FileInfo.Mpartial
6717 let cty = TI.instantiable_hint
env cty in
6718 let env, cty = Phase.localize_with_self
env cty in
6719 env, Some
(p, Reason.URhint
, cty) in
6720 (* Next check the expression, passing in expected type if present *)
6721 let env, typed_cv_expr
, ty =
6722 match cv
.cv_expr
with
6723 | None
-> env, None
, Env.fresh_type
()
6725 let env, te, ty = expr ?
expected env e in
6726 (* Check that the inferred type is a subtype of the expected type.
6727 * Eventually this will be the responsibility of `expr`
6732 | Some
(p, ur
, cty) -> Type.coerce_type
p ur
env ty cty in
6736 then Typing_attributes.check_def
env new_object
6737 SN.AttributeKinds.staticProperty cv
.cv_user_attributes
6738 else Typing_attributes.check_def
env new_object
6739 SN.AttributeKinds.instProperty cv
.cv_user_attributes
in
6741 if Option.is_none cv
.cv_type
6743 if Env.is_strict
env
6744 then Errors.add_a_typehint
(fst cv
.cv_id
)
6746 let pos, name = cv
.cv_id
in
6747 let name = if is_static
then "$" ^
name else name in
6748 let var_type = Reason.Rwitness
pos, Typing_utils.tany env in
6749 if Option.is_none cv
.cv_expr
6750 then Typing_suggest.uninitialized_member
(snd
c.c_name
) name env var_type ty
6751 else Typing_suggest.save_member
name env var_type ty
6754 T.cv_final
= cv
.cv_final
;
6755 T.cv_is_xhp
= cv
.cv_is_xhp
;
6756 T.cv_visibility
= cv
.cv_visibility
;
6757 T.cv_type
= cv
.cv_type
;
6759 T.cv_expr
= typed_cv_expr
;
6760 T.cv_user_attributes
= List.map cv
.cv_user_attributes
(user_attribute
env);
6764 and localize_where_constraints
6765 ~
ety_env (env:Env.env) (where_constraints
:Nast.where_constraint list
) =
6766 let add_constraint env (h1
, ck
, h2
) =
6768 Phase.localize
env (Decl_hint.hint
env.Env.decl_env h1
) ~
ety_env in
6770 Phase.localize
env (Decl_hint.hint
env.Env.decl_env h2
) ~
ety_env in
6771 SubType.add_constraint (fst h1
) env ck
ty1 ty2
6773 List.fold_left where_constraints ~
f:add_constraint ~init
:env
6775 and add_constraints
p env constraints
=
6776 let add_constraint env (ty1, ck
, ty2) =
6777 SubType.add_constraint p env ck
ty1 ty2 in
6778 List.fold_left constraints ~
f:add_constraint ~init
: env
6780 and user_attribute
env ua
=
6781 let typed_ua_params =
6782 List.map ua
.ua_params
(fun e -> let _env, te, _ty
= expr
env e in te) in
6784 T.ua_name
= ua
.ua_name
;
6785 T.ua_params
= typed_ua_params;
6788 and method_def
env m =
6789 (* reset the expression dependent display ids for each method body *)
6790 Reason.expr_display_id_map
:= IMap.empty
;
6791 let pos = fst
m.m_name
in
6792 let env = Env.reinitialize_locals
env in
6793 let env = Env.set_env_function_pos
env pos in
6794 let env = Typing_attributes.check_def
env new_object
6795 SN.AttributeKinds.mthd
m.m_user_attributes
in
6796 let reactive = fun_reactivity env.Env.decl_env
m.m_user_attributes
m.m_params
in
6798 TUtils.fun_mutable
m.m_user_attributes
||
6799 (* <<__Mutable>> is implicit on constructors *)
6800 snd
m.m_name
= SN.Members.__construct
in
6801 let env = Env.set_env_reactive
env reactive in
6802 let env = Env.set_fun_mutable
env mut in
6804 { (Phase.env_with_self
env) with from_class
= Some CIstatic
; } in
6805 let env, constraints
=
6806 Phase.localize_generic_parameters_with_bounds
env m.m_tparams
6808 TI.check_tparams_instantiable
env m.m_tparams
;
6809 let env = add_constraints
pos env constraints
in
6811 localize_where_constraints ~
ety_env env m.m_where_constraints
in
6813 if Env.is_static
env then env
6814 else Env.set_local
env this
(Env.get_self
env) in
6816 match Env.get_class
env (Env.get_self_id
env) with
6819 (* Mark $this as a using variable if it has a disposable type *)
6820 if c.tc_is_disposable
6821 then Env.set_using_var
env this
6823 let env = Env.clear_params
env in
6824 let env, ty = match m.m_ret
with
6826 env, Typing_return.make_default_return
env m.m_name
6828 let ret = TI.instantiable_hint
env ret in
6829 (* If a 'this' type appears it needs to be compatible with the
6833 { (Phase.env_with_self
env) with
6834 from_class
= Some CIstatic
} in
6835 Phase.localize ~
ety_env env ret in
6836 let return = Typing_return.make_info
m.m_fun_kind
m.m_user_attributes
env
6837 ~is_explicit
:(Option.is_some
m.m_ret
) ~is_by_ref
:m.m_ret_by_ref
ty in
6838 TI.check_params_instantiable
env m.m_params
;
6839 let env, param_tys
=
6840 List.map_env
env m.m_params
make_param_local_ty in
6841 if Env.is_strict
env then begin
6842 List.iter2_exn ~
f:(check_param
env) m.m_params param_tys
;
6844 Typing_memoize.check_method
env m;
6845 let env, typed_params
=
6846 List.map_env
env (List.zip_exn param_tys
m.m_params
) bind_param in
6847 let env, t_variadic
= match m.m_variadic
with
6848 | FVvariadicArg vparam
->
6849 TI.check_param_instantiable
env vparam
;
6850 let env, ty = make_param_local_ty env vparam
in
6851 if Env.is_strict
env then
6852 check_param
env vparam
ty;
6853 let env, t_variadic
= bind_param env (ty, vparam
) in
6854 env, (T.FVvariadicArg t_variadic
)
6855 | FVellipsis
p -> env, T.FVellipsis
p
6856 | FVnonVariadic
-> env, T.FVnonVariadic
in
6857 let nb = Nast.assert_named_body
m.m_body
in
6858 let local_tpenv = env.Env.lenv.Env.tpenv
in
6860 fun_ ~abstract
:m.m_abstract
env return pos nb m.m_fun_kind
in
6862 Env.check_todo
env in
6866 snd
m.m_name
= SN.Members.__destruct
6867 || snd
m.m_name
= SN.Members.__construct
->
6868 Some
(pos, Happly
((pos, "void"), []))
6869 | None
when Env.is_strict
env ->
6870 Typing_return.suggest_return
env pos return.Typing_env_return_info.return_type; None
6871 | None
-> let (pos, id) = m.m_name
in
6872 let id = (Env.get_self_id
env) ^
"::" ^
id in
6873 Typing_suggest.save_fun_or_method
(pos, id);
6876 Typing_return.async_suggest_return
(m.m_fun_kind
) hint
(fst
m.m_name
); m.m_ret in
6877 let m = { m with m_ret = m_ret; } in
6879 T.m_annotation
= Env.save
local_tpenv env;
6880 T.m_final
= m.m_final
;
6881 T.m_abstract
= m.m_abstract
;
6882 T.m_visibility
= m.m_visibility
;
6883 T.m_name
= m.m_name
;
6884 T.m_tparams
= m.m_tparams
;
6885 T.m_where_constraints
= m.m_where_constraints
;
6886 T.m_variadic
= t_variadic
;
6887 T.m_params
= typed_params
;
6888 T.m_fun_kind
= m.m_fun_kind
;
6889 T.m_user_attributes
= List.map
m.m_user_attributes
(user_attribute
env);
6891 T.m_body
= T.NamedBody
{
6893 T.fnb_unsafe
= nb.fnb_unsafe
;
6895 T.m_ret_by_ref
= m.m_ret_by_ref
;
6896 T.m_external
= m.m_external
;
6898 Typing_lambda_ambiguous.suggest_method_def
env method_def
6900 and typedef_def
tcopt typedef
=
6901 let env = EnvFromDef.typedef_env
tcopt typedef
in
6902 let tdecl = Env.get_typedef
env (snd typedef
.t_name
) in
6903 add_decl_errors
(Option.(map
tdecl (fun tdecl -> value_exn
tdecl.td_decl_errors
)));
6904 let env, constraints
=
6905 Phase.localize_generic_parameters_with_bounds
env typedef
.t_tparams
6906 ~
ety_env:(Phase.env_with_self
env) in
6907 let env = add_constraints
(fst typedef
.t_name
) env constraints
in
6908 NastCheck.typedef
env typedef
;
6913 t_constraint
= tcstr
;
6915 t_user_attributes
= _;
6920 let ty = TI.instantiable_hint
env hint
in
6921 let env, ty = Phase.localize_with_self
env ty in
6922 let env = begin match tcstr
with
6924 let cstr = TI.instantiable_hint
env tcstr
in
6925 let env, cstr = Phase.localize_with_self
env cstr in
6926 Typing_ops.sub_type t_pos
Reason.URnewtype_cstr
env ty cstr
6929 let env = begin match hint
with
6930 | pos, Hshape
{ nsi_allows_unknown_fields
=_; nsi_field_map
} ->
6931 check_shape_keys_validity
env pos (ShapeMap.keys nsi_field_map
)
6934 let env = Typing_attributes.check_def
env new_object
6935 SN.AttributeKinds.typealias typedef
.t_user_attributes
in
6937 T.t_annotation
= Env.save
env.Env.lenv.Env.tpenv
env;
6938 T.t_name
= typedef
.t_name
;
6939 T.t_mode
= typedef
.t_mode
;
6940 T.t_vis
= typedef
.t_vis
;
6941 T.t_user_attributes
= List.map typedef
.t_user_attributes
(user_attribute
env);
6942 T.t_constraint
= typedef
.t_constraint
;
6943 T.t_kind
= typedef
.t_kind
;
6944 T.t_tparams
= typedef
.t_tparams
;
6945 T.t_namespace
= typedef
.t_namespace
;
6948 and gconst_def
tcopt cst
=
6949 let env = EnvFromDef.gconst_env
tcopt cst
in
6950 add_decl_errors
(Option.map
(Env.get_gconst
env (snd cst
.cst_name
)) ~
f:snd
);
6952 let typed_cst_value, env =
6953 match cst
.cst_value
with
6956 match cst
.cst_type
with
6958 let ty = TI.instantiable_hint
env hint
in
6959 let env, dty
= Phase.localize_with_self
env ty in
6960 let env, te, value_type
=
6961 expr ~
expected:(fst hint
, Reason.URhint
, dty
) env value in
6962 let env = Typing_utils.sub_type
env value_type dty
in
6965 let env, te, _value_type
= expr
env value in
6968 { T.cst_annotation
= Env.save
env.Env.lenv.Env.tpenv
env;
6969 T.cst_mode
= cst
.cst_mode
;
6970 T.cst_name
= cst
.cst_name
;
6971 T.cst_type
= cst
.cst_type
;
6972 T.cst_value
= typed_cst_value;
6973 T.cst_is_define
= cst
.cst_is_define
;
6976 (* Calls the method of a class, but allows the f callback to override the
6977 * return value type *)
6978 and overload_function make_call fpos p env (cpos
, class_id
) method_id
el uel
f =
6979 let env, tcid
, ty = static_class_id ~check_constraints
:false cpos
env class_id
in
6980 let env, _tel
, _ = exprs ~is_func_arg
:true env el in
6982 class_get ~
is_method:true ~is_const
:false env ty method_id class_id
in
6983 (* call the function as declared to validate arity and input types,
6984 but ignore the result and overwrite with custom one *)
6985 let (env, tel, tuel
, res
), has_error
= Errors.try_with_error
6986 (* TODO: Should we be passing hints here *)
6987 (fun () -> (call ~
expected:None
p env fty el uel
), false)
6988 (fun () -> (env, [], [], (Reason.Rwitness
p, Typing_utils.tany env)), true) in
6989 (* if there are errors already stop here - going forward would
6990 * report them twice *)
6992 then env, T.make_typed_expr
p res
T.Any
, res
6994 let env, ty = f env fty res
el in
6997 | r, Tfun
ft -> r, Tfun
{ft with ft_ret
= ty}
6999 let te = T.make_typed_expr
fpos fty (T.Class_const
(tcid
, method_id
)) in
7000 make_call env te [] tel tuel
ty
7002 and update_array_type ?lhs_of_null_coalesce
p env e1 e2
valkind =
7003 let access_type = Typing_arrays.static_array_access
env e2
in
7005 Typing_arrays.update_array_type
p access_type in
7007 | `lvalue
| `lvalue_subexpr
->
7009 raw_expr ~
valkind:`lvalue_subexpr
env e1
in
7010 let env, ty1 = type_mapper env ty1 in
7012 | (_, Lvar
(_, x)) ->
7013 (* type_mapper has updated the type in ty1 typevars, but we
7014 need to update the local variable type too *)
7015 let env, ty1 = set_valid_rvalue
p env x ty1 in
7017 | _ -> env, te1, ty1
7020 raw_expr ?lhs_of_null_coalesce
env e1
7022 let nast_to_tast opts nast
=
7023 let convert_def = function
7024 | Nast.Fun
f -> T.Fun
(fun_def opts
f)
7025 | Nast.Constant gc
-> T.Constant
(gconst_def opts gc
)
7026 | Nast.Typedef td
-> T.Typedef
(typedef_def opts td
)
7027 | Nast.Class
c -> begin
7028 match class_def opts
c with
7029 | Some
c -> (T.Class
c)
7030 | None
-> failwith
@@ Printf.sprintf
7031 "Error in declaration of class: %s" (snd
c.c_name
)
7033 (* We don't typecheck top level statements:
7034 * https://docs.hhvm.com/hack/unsupported/top-level
7035 * so just create the minimal env for us to construct a Stmt.
7038 let env = Env.empty opts
Relative_path.default None
in
7039 T.Stmt
(snd
(stmt
env s))
7041 let tast = List.map nast
convert_def in
7042 Tast_check.program
tast;