1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Intraprocedural resolution of static types and OO-services
18 # By OO-services we mean message sending, attribute access, instantiation, etc.
25 redef class ToolContext
26 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
29 private class TypingPhase
31 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
34 private class TypeVisitor
35 var modelbuilder
: ModelBuilder
37 # The module of the analysis
38 # Used to correctly query the model
41 # The static type of the receiver
42 # Mainly used for type tests and type resolutions
43 var anchor
: MClassType is noinit
45 # The analyzed mclassdef
46 var mclassdef
: MClassDef is noinit
48 # The analyzed property
49 var mpropdef
: MPropDef
51 var selfvariable
= new Variable("self")
53 # Is `self` use restricted?
54 # * no explicit `self`
55 # * method called on the implicit self must be top-level
56 # Currently only used for `new` factory since there is no valid receiver inside
57 var is_toplevel_context
= false
61 var mpropdef
= self.mpropdef
62 var mclassdef
= mpropdef
.mclassdef
63 self.mclassdef
= mclassdef
64 self.anchor
= mclassdef
.bound_mtype
66 var mclass
= mclassdef
.mclass
68 var selfvariable
= new Variable("self")
69 self.selfvariable
= selfvariable
70 selfvariable
.declared_type
= mclass
.mclass_type
72 var mprop
= mpropdef
.mproperty
73 if mprop
isa MMethod and mprop
.is_new
then
74 is_toplevel_context
= true
78 fun anchor_to
(mtype
: MType): MType
80 return mtype
.anchor_to
(mmodule
, anchor
)
83 fun is_subtype
(sub
, sup
: MType): Bool
85 return sub
.is_subtype
(mmodule
, anchor
, sup
)
88 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
90 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
91 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
95 # Check that `sub` is a subtype of `sup`.
96 # If `sub` is not a valid suptype, then display an error on `node` and return `null`.
97 # If `sub` is a safe subtype of `sup`, then return `sub`.
98 # If `sub` is an unsafe subtype (i.e., an implicit cast is required), then return `sup`.
100 # The point of the return type is to determinate the usable type on an expression when `autocast` is true:
101 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
102 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
103 fun check_subtype
(node
: ANode, sub
, sup
: MType, autocast
: Bool): nullable MType
105 if self.is_subtype
(sub
, sup
) then return sub
106 if autocast
and self.is_subtype
(sub
, self.anchor_to
(sup
)) then
107 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
108 #node.debug("Unsafe typing: expected {sup}, got {sub}")
111 if sup
isa MErrorType then return null # Skip error
112 if sub
.need_anchor
then
113 var u
= anchor_to
(sub
)
114 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}: {u}`.")
116 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}`.")
121 # Visit an expression and do not care about the return value
122 fun visit_stmt
(nexpr
: nullable AExpr)
124 if nexpr
== null then return
125 nexpr
.accept_typing
(self)
128 # Visit an expression and expects that it is not a statement
129 # Return the type of the expression
130 # Display an error and return null if:
131 # * the type cannot be determined or
132 # * `nexpr` is a statement
133 fun visit_expr
(nexpr
: AExpr): nullable MType
135 nexpr
.accept_typing
(self)
136 var mtype
= nexpr
.mtype
137 if mtype
!= null then return mtype
138 if not nexpr
.is_typed
then
139 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
140 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
141 nexpr
.debug
("No return type but no error.")
144 return null # forward error
146 var more_message
= null
148 if p
!= null then more_message
= p
.bad_expr_message
(nexpr
)
149 if more_message
== null then more_message
= "" else more_message
= " " + more_message
150 self.error
(nexpr
, "Error: expected an expression{more_message}.")
154 # Visit an expression and expect its static type is a least a `sup`
155 # Return the type of the expression or null if
156 # * the type cannot be determined or
157 # * `nexpr` is a statement or
158 # * `nexpr` is not a `sup`
159 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
161 var sub
= visit_expr
(nexpr
)
162 if sub
== null then return null # Forward error
164 if sup
== null then return null # Forward error
166 var res
= check_subtype
(nexpr
, sub
, sup
, true)
168 nexpr
.implicit_cast_to
= res
173 # Visit an expression and expect its static type is a `Bool`
174 # Return the type of the expression or null if
175 # * the type cannot be determined or
176 # * `nexpr` is a statement or
177 # * `nexpr` is not a `Bool`
178 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
180 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
184 fun check_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
186 var sub
= nexpr
.mtype
187 if sub
== null then return null # Forward error
189 var sup
= ntype
.mtype
190 if sup
== null then return null # Forward error
193 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}`.")
194 else if self.is_subtype
(sub
, sup
) then
195 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}` since it is a `{sub}`.")
200 # Can `mtype` be null (up to the current knowledge)?
201 fun can_be_null
(mtype
: MType): Bool
203 if mtype
isa MNullableType or mtype
isa MNullType then return true
204 if mtype
isa MFormalType then
205 var x
= anchor_to
(mtype
)
206 if x
isa MNullableType or x
isa MNullType then return true
211 # Check that `mtype` can be null (up to the current knowledge).
213 # If not then display a `useless-null-test` warning on node and return false.
215 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
217 if mtype
isa MNullType then
218 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is always `null`.")
221 if can_be_null
(mtype
) then return true
223 if mtype
isa MFormalType then
224 var res
= anchor_to
(mtype
)
225 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
227 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
232 # Special verification on != and == for null
234 fun null_test
(anode
: ABinopExpr)
236 var mtype
= anode
.n_expr
.mtype
237 var mtype2
= anode
.n_expr2
.mtype
239 if mtype
== null or mtype2
== null then return
241 if not mtype2
isa MNullType then return
243 # Check of useless null
244 if not can_be_null
(mtype
) then return
246 if mtype
isa MNullType then
247 # Because of type adaptation, we cannot just stop here
248 # so return use `null` as a bottom type that will be merged easily (cf) `merge_types`
251 mtype
= mtype
.as_notnull
254 # Check for type adaptation
255 var variable
= anode
.n_expr
.its_variable
256 if variable
== null then return
258 # One is null (mtype2 see above) the other is not null
259 if anode
isa AEqExpr then
260 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype2
)
261 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype
)
262 else if anode
isa ANeExpr then
263 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype2
)
264 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype
)
270 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
272 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
275 fun resolve_mtype
(node
: AType): nullable MType
277 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
280 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
282 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
286 fun get_mclass
(node
: ANode, name
: String): nullable MClass
288 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
292 fun type_bool
(node
: ANode): nullable MType
294 var mclass
= self.get_mclass
(node
, "Bool")
295 if mclass
== null then return null
296 return mclass
.mclass_type
299 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
301 var unsafe_type
= self.anchor_to
(recvtype
)
303 #debug("recv: {recvtype} (aka {unsafe_type})")
304 if recvtype
isa MNullType then
305 var objclass
= get_mclass
(node
, "Object")
306 if objclass
== null then return null # Forward error
307 unsafe_type
= objclass
.mclass_type
310 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
311 if name
== "new" and mproperty
== null then
313 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
316 if mproperty
== null then
318 self.modelbuilder
.error
(node
, "Error: method or variable `{name}` unknown in `{recvtype}`.")
319 else if recvtype
.need_anchor
then
320 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}: {unsafe_type}`.")
322 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}`.")
327 assert mproperty
isa MMethod
329 # `null` only accepts some methods of object.
330 if recvtype
isa MNullType and not mproperty
.is_null_safe
then
331 self.error
(node
, "Error: method `{name}` called on `null`.")
333 else if unsafe_type
isa MNullableType and not mproperty
.is_null_safe
then
334 modelbuilder
.advice
(node
, "call-on-nullable", "Warning: method call on a nullable receiver `{recvtype}`.")
337 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
338 error
(node
, "Error: `{name}` is not a top-level method, thus need a receiver.")
340 if not recv_is_self
and mproperty
.is_toplevel
then
341 error
(node
, "Error: cannot call `{name}`, a top-level method, with a receiver.")
344 if mproperty
.visibility
== protected_visibility
and not recv_is_self
and self.mmodule
.visibility_for
(mproperty
.intro_mclassdef
.mmodule
) < intrude_visibility
and not modelbuilder
.toolcontext
.opt_ignore_visibility
.value
then
345 self.modelbuilder
.error
(node
, "Error: method `{name}` is protected and can only accessed by `self`.")
349 var info
= mproperty
.deprecation
350 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
353 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated: {mdoc.content.first}")
355 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated.")
359 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
361 if propdefs
.length
== 0 then
362 self.modelbuilder
.error
(node
, "Type Error: no definition found for property `{name}` in `{unsafe_type}`.")
364 else if propdefs
.length
== 1 then
365 mpropdef
= propdefs
.first
367 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property `{name}` in `{unsafe_type}`: {propdefs.join(" ")}")
368 mpropdef
= mproperty
.intro
372 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
373 if msignature
== null then return null # skip error
374 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
376 var erasure_cast
= false
377 var rettype
= mpropdef
.msignature
.return_mtype
378 if not recv_is_self
and rettype
!= null then
379 rettype
= rettype
.undecorate
380 if rettype
isa MParameterType then
381 var erased_rettype
= msignature
.return_mtype
382 assert erased_rettype
!= null
383 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
388 var callsite
= new CallSite(node
.hot_location
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
392 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
394 var unsafe_type
= self.anchor_to
(recvtype
)
395 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
396 if mproperty
== null then return null
397 return get_method
(node
, recvtype
, name
, recv_is_self
)
401 # Visit the expressions of args and check their conformity with the corresponding type in signature
402 # The point of this method is to handle varargs correctly
403 # Note: The signature must be correctly adapted
404 fun check_signature
(node
: ANode, args
: Array[AExpr], mproperty
: MProperty, msignature
: MSignature): nullable SignatureMap
406 var vararg_rank
= msignature
.vararg_rank
407 if vararg_rank
>= 0 then
408 if args
.length
< msignature
.arity
then
409 modelbuilder
.error
(node
, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
412 else if args
.length
!= msignature
.arity
then
414 if args
.length
> msignature
.arity
then
415 modelbuilder
.error
(node
, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
418 # Other cases are managed later
422 #debug("CALL {unsafe_type}.{msignature}")
424 # Associate each parameter to a position in the arguments
425 var map
= new SignatureMap
427 # Special case for the isolated last argument
428 # TODO: reify this method characteristics (where? the param, the signature, the method?)
429 var last_is_padded
= mproperty
.name
.chars
.last
== '='
430 var nbargs
= args
.length
431 if last_is_padded
then
433 assert not args
.last
isa ANamedargExpr
434 map
.map
[msignature
.arity
- 1] = args
.length
- 1
435 self.visit_expr_subtype
(args
.last
, msignature
.mparameters
.last
.mtype
)
438 # First, handle named arguments
439 for i
in [0..args
.length
[ do
441 if not e
isa ANamedargExpr then continue
442 var name
= e
.n_id
.text
443 var param
= msignature
.mparameter_by_name
(name
)
444 if param
== null then
445 modelbuilder
.error
(e
.n_id
, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
448 var idx
= msignature
.mparameters
.index_of
(param
)
449 var prev
= map
.map
.get_or_null
(idx
)
451 modelbuilder
.error
(e
, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
455 e
.mtype
= self.visit_expr_subtype
(e
.n_expr
, param
.mtype
)
458 # Number of minimum mandatory remaining parameters
461 # Second, associate remaining parameters
462 var vararg_decl
= args
.length
- msignature
.arity
464 for i
in [0..msignature
.arity
[ do
465 # Skip parameters associated by name
466 if map
.map
.has_key
(i
) then continue
468 var param
= msignature
.mparameters
[i
]
470 # Search the next free argument: skip named arguments since they are already associated
471 while j
< nbargs
and args
[j
] isa ANamedargExpr do j
+= 1
473 if not param
.mtype
isa MNullableType then
483 if i
== vararg_rank
then
485 continue # skip the vararg
488 if not param
.is_vararg
then
489 var paramtype
= param
.mtype
490 self.visit_expr_subtype
(arg
, paramtype
)
492 check_one_vararg
(arg
, param
)
496 if min_arity
> 0 then
497 if last_is_padded
then min_arity
+= 1
498 if min_arity
< msignature
.arity
then
499 modelbuilder
.error
(node
, "Error: expected at least {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
501 modelbuilder
.error
(node
, "Error: expected {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
506 # Third, check varargs
507 if vararg_rank
>= 0 then
508 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
509 var first
= args
[vararg_rank
]
510 if vararg_decl
== 0 then
511 if not check_one_vararg
(first
, msignature
.mparameters
[vararg_rank
]) then return null
513 first
.vararg_decl
= vararg_decl
+ 1
514 for i
in [vararg_rank
..vararg_rank
+vararg_decl
] do
515 self.visit_expr_subtype
(args
[i
], paramtype
)
523 # Check an expression as a single vararg.
524 # The main point of the method if to handle the case of reversed vararg (see `AVarargExpr`)
525 fun check_one_vararg
(arg
: AExpr, param
: MParameter): Bool
527 var paramtype
= param
.mtype
528 var mclass
= get_mclass
(arg
, "Array")
529 if mclass
== null then return false # Forward error
530 var array_mtype
= mclass
.get_mtype
([paramtype
])
531 if arg
isa AVarargExpr then
532 self.visit_expr_subtype
(arg
.n_expr
, array_mtype
)
533 arg
.mtype
= arg
.n_expr
.mtype
535 # only one vararg, maybe `...` was forgot, so be gentle!
536 var t
= visit_expr
(arg
)
537 if t
== null then return false # Forward error
538 if not is_subtype
(t
, paramtype
) and is_subtype
(t
, array_mtype
) then
539 # Not acceptable but could be a `...`
540 error
(arg
, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
543 # Standard valid vararg, finish the job
545 self.visit_expr_subtype
(arg
, paramtype
)
550 fun error
(node
: ANode, message
: String)
552 self.modelbuilder
.error
(node
, message
)
555 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
557 if not variable
.is_adapted
then return variable
.declared_type
559 var flow
= node
.after_flow_context
560 if flow
== null then return null # skip error
562 if flow
.vars
.has_key
(variable
) then
563 return flow
.vars
[variable
]
565 #node.debug("*** START Collected for {variable}")
566 var mtypes
= flow
.collect_types
(variable
)
567 #node.debug("**** END Collected for {variable}")
568 if mtypes
.length
== 0 then
569 return variable
.declared_type
570 else if mtypes
.length
== 1 then
573 var res
= merge_types
(node
,mtypes
)
575 res
= variable
.declared_type
576 # Try to fallback to a non-null version
577 if res
!= null and can_be_null
(res
) then do
579 if t
!= null and can_be_null
(t
) then break label
589 # Some variables where type-adapted during the visit
592 # Some loops had been visited during the visit
595 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
597 var flow
= node
.after_flow_context
600 flow
.set_var
(self, variable
, mtype
)
603 # Find the exact representable most specific common super-type in `col`.
605 # Try to find the most specific common type that is a super-type of each types
607 # In most cases, the result is simply the most general type in `col`.
608 # If nullables types are involved, then the nullable information is correctly preserved.
609 # If incomparable super-types exists in `col`, them no solution is given and the `null`
610 # value is returned (since union types are non representable in Nit)
612 # The `null` values in `col` are ignored, nulltypes (MNullType) are considered.
614 # Returns the `null` value if:
617 # * `col` only have null values
618 # * there is a conflict
620 # Example (with a diamond A,B,C,D):
622 # * merge(A,B,C) -> A, because A is the most general type in {A,B,C}
623 # * merge(C,B) -> null, there is conflict, because `B or C` cannot be represented
624 # * merge(A,nullable B) -> nullable A, because A is the most general type and
625 # the nullable information is preserved
626 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
628 if col
.length
== 1 then return col
.first
630 if t1
== null then continue # return null
633 if t2
== null then continue # return null
634 if can_be_null
(t2
) and not can_be_null
(t1
) then
637 if not is_subtype
(t2
, t1
) then found
= false
640 #print "merge {col.join(" ")} -> {t1}"
644 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
648 # Find a most general common subtype between `type1` and `type2`.
650 # Find the most general type that is a subtype of `type2` and, if possible, a subtype of `type1`.
651 # Basically, this return the most specific type between `type1` and `type2`.
652 # If nullable types are involved, the information is correctly preserved.
653 # If `type1` and `type2` are incomparable then `type2` is preferred (since intersection types
654 # are not representable in Nit).
656 # The `null` value is returned if both `type1` and `type2` are null.
658 # Examples (with diamond A,B,C,D):
660 # * intersect_types(A,B) -> B, because B is a subtype of A
661 # * intersect_types(B,A) -> B, because B is a subtype of A
662 # * intersect_types(B,C) -> C, B and C are incomparable,
663 # `type2` is then preferred (`B and C` cannot be represented)
664 # * intersect_types(nullable B,A) -> B, because B<:A and the non-null information is preserved
665 # * intersect_types(B,nullable C) -> C, `type2` is preferred and the non-null information is preserved
666 fun intersect_types
(node
: ANode, type1
, type2
: nullable MType): nullable MType
668 if type1
== null then return type2
669 if type2
== null then return type1
671 if not can_be_null
(type2
) or not can_be_null
(type1
) then
672 type1
= type1
.as_notnull
673 type2
= type2
.as_notnull
677 if is_subtype
(type1
, type2
) then
685 # Find a most general type that is a subtype of `type1` but not one of `type2`.
687 # Basically, this returns `type1`-`type2` but since there is no substraction type
688 # in Nit this just returns `type1` most of the case.
690 # The few other cases are if `type2` is a super-type and if some nullable information
693 # The `null` value is returned if `type1` is null.
695 # Examples (with diamond A,B,C,D):
697 # * diff_types(A,B) -> A, because the notB cannot be represented
698 # * diff_types(B,A) -> None (absurd type), because B<:A
699 # * diff_types(nullable A, nullable B) -> A, because null is removed
700 # * diff_types(nullable B, A) -> Null, because anything but null is removed
701 fun diff_types
(node
: ANode, type1
, type2
: nullable MType): nullable MType
703 if type1
== null then return null
704 if type2
== null then return type1
706 # if t1 <: t2 then t1-t2 = bottom
707 if is_subtype
(type1
, type2
) then
708 return modelbuilder
.model
.null_type
.as_notnull
711 # else if t1 <: nullable t2 then t1-t2 = nulltype
712 if is_subtype
(type1
, type2
.as_nullable
) then
713 return modelbuilder
.model
.null_type
716 # else t2 can be null and type2 must accept null then null is excluded in t1
717 if can_be_null
(type1
) and (type2
isa MNullableType or type2
isa MNullType) then
718 return type1
.as_notnull
725 # Mapping between parameters and arguments in a call.
727 # Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
729 # The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
731 # Associate a parameter to an argument
732 var map
= new ArrayMap[Int, Int]
735 # A specific method call site with its associated informations.
741 # The static type of the receiver (possibly unresolved)
744 # The module where the callsite is present
747 # The anchor to use with `recv` or `msignature`
748 var anchor
: nullable MClassType
750 # Is the receiver self?
751 # If "for_self", virtual types of the signature are kept
752 # If "not_for_self", virtual type are erased
753 var recv_is_self
: Bool
755 # The designated method
756 var mproperty
: MMethod
758 # The statically designated method definition
759 # The most specif one, it is.
760 var mpropdef
: MMethodDef
762 # The resolved signature for the receiver
763 var msignature
: MSignature
765 # Is a implicit cast required on erasure typing policy?
766 var erasure_cast
: Bool
768 # The mapping used on the call to associate arguments to parameters
769 # If null then no specific association is required.
770 var signaturemap
: nullable SignatureMap = null
772 private fun check_signature
(v
: TypeVisitor, node
: ANode, args
: Array[AExpr]): Bool
774 var map
= v
.check_signature
(node
, args
, self.mproperty
, self.msignature
)
776 if map
== null then is_broken
= true
780 # Information about the callsite to display on a node
781 fun dump_info
(v
: ASTDump): String do
782 return "{recv}.{mpropdef}{msignature}"
785 redef fun mdoc_or_fallback
do return mproperty
.intro
.mdoc
789 # The declared type of the variable
790 var declared_type
: nullable MType = null is writable
792 # Was the variable type-adapted?
793 # This is used to speedup type retrieval while it remains `false`
794 private var is_adapted
= false
797 redef class FlowContext
798 # Store changes of types because of type evolution
799 private var vars
= new HashMap[Variable, nullable MType]
801 # Adapt the variable to a static type
802 # Warning1: do not modify vars directly.
803 # Warning2: sub-flow may have cached a unadapted variable
804 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
806 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
807 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
808 self.vars
[variable
] = mtype
810 variable
.is_adapted
= true
811 #node.debug "set {variable} to {mtype or else "X"}"
814 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
815 private fun collect_types
(variable
: Variable): Array[nullable MType]
817 #node.debug "flow for {variable}"
818 var res
= new Array[nullable MType]
821 var seen
= new HashSet[FlowContext]
822 while not todo
.is_empty
do
824 if f
.is_unreachable
then continue
825 if seen
.has
(f
) then continue
828 if f
.vars
.has_key
(variable
) then
829 # Found something. Collect it and do not process further on this path
830 res
.add f
.vars
[variable
]
831 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
833 todo
.add_all f
.previous
835 if f
.previous
.is_empty
then
836 # Root flowcontext mean a parameter or something related
837 res
.add variable
.declared_type
838 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
842 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
848 # The entry point of the whole typing analysis
849 fun do_typing
(modelbuilder
: ModelBuilder)
853 # The variable associated to the receiver (if any)
854 var selfvariable
: nullable Variable
857 redef class AMethPropdef
858 redef fun do_typing
(modelbuilder
: ModelBuilder)
860 var mpropdef
= self.mpropdef
861 if mpropdef
== null then return # skip error
863 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
864 self.selfvariable
= v
.selfvariable
866 var mmethoddef
= self.mpropdef
.as(not null)
867 var msignature
= mmethoddef
.msignature
868 if msignature
== null then return # skip error
869 for i
in [0..msignature
.arity
[ do
870 var mtype
= msignature
.mparameters
[i
].mtype
871 if msignature
.vararg_rank
== i
then
872 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
873 if arrayclass
== null then return # Skip error
874 mtype
= arrayclass
.get_mtype
([mtype
])
876 var variable
= self.n_signature
.n_params
[i
].variable
877 assert variable
!= null
878 variable
.declared_type
= mtype
881 var nblock
= self.n_block
882 if nblock
== null then return
887 if not v
.has_loop
or not v
.dirty
then break
890 var post_visitor
= new PostTypingVisitor(v
)
891 post_visitor
.enter_visit
(self)
893 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
894 # We reach the end of the function without having a return, it is bad
895 v
.error
(self, "Error: reached end of function; expected `return` with a value.")
900 private class PostTypingVisitor
902 var type_visitor
: TypeVisitor
903 redef fun visit
(n
) do
905 n
.accept_post_typing
(type_visitor
)
906 if n
isa AExpr and n
.mtype
== null and not n
.is_typed
then
913 private fun accept_post_typing
(v
: TypeVisitor) do end
915 # An additional information message to explain the role of a child expression.
917 # The point of the method is to allow some kind of double dispatch so the parent
918 # choose how to describe its children.
919 private fun bad_expr_message
(child
: AExpr): nullable String do return null
922 redef class AAttrPropdef
923 redef fun do_typing
(modelbuilder
: ModelBuilder)
925 if not has_value
then return
927 var mpropdef
= self.mreadpropdef
928 if mpropdef
== null or mpropdef
.msignature
== null then return # skip error
930 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
931 self.selfvariable
= v
.selfvariable
933 var nexpr
= self.n_expr
934 if nexpr
!= null then
935 var mtype
= self.mtype
936 v
.visit_expr_subtype
(nexpr
, mtype
)
938 var nblock
= self.n_block
939 if nblock
!= null then
941 if not nblock
.after_flow_context
.is_unreachable
then
942 # We reach the end of the init without having a return, it is bad
943 v
.error
(self, "Error: reached end of block; expected `return`.")
952 # The static type of the expression.
953 # null if self is a statement or in case of error
954 var mtype
: nullable MType = null
956 # Is the statement correctly typed?
957 # Used to distinguish errors and statements when `mtype == null`
958 var is_typed
: Bool = false
960 # If required, the following implicit cast `.as(XXX)`
961 # Such a cast may by required after evaluating the expression when
962 # a unsafe operation is detected (silently accepted by the Nit language).
963 # The attribute is computed by `check_subtype`
964 var implicit_cast_to
: nullable MType = null
966 # Return the variable read (if any)
967 # Used to perform adaptive typing
968 fun its_variable
: nullable Variable do return null
970 private fun accept_typing
(v
: TypeVisitor)
972 v
.error
(self, "no implemented accept_typing for {self.class_name}")
975 # Is non-null if `self` is a leaf of a comprehension array construction.
976 # In this case, the enclosing literal array node is designated.
977 # The result of the evaluation of `self` must be
978 # stored inside the designated array (there is an implicit `push`)
979 var comprehension
: nullable AArrayExpr = null
981 # It indicates the number of arguments collected as a vararg.
983 # When 0, the argument is used as is, without transformation.
984 # When 1, the argument is transformed into an singleton array.
985 # Above 1, the arguments and the next ones are transformed into a common array.
987 # This attribute is meaning less on expressions not used as attributes.
988 var vararg_decl
: Int = 0
990 redef fun dump_info
(v
) do
992 var mtype
= self.mtype
993 if mtype
!= null then
994 res
+= v
.yellow
(":{mtype}")
996 var ict
= self.implicit_cast_to
998 res
+= v
.yellow
("(.as({ict}))")
1004 redef class ABlockExpr
1005 redef fun accept_typing
(v
)
1007 for e
in self.n_expr
do v
.visit_stmt
(e
)
1008 self.is_typed
= true
1011 # The type of a blockexpr is the one of the last expression (or null if empty)
1014 if self.n_expr
.is_empty
then return null
1015 return self.n_expr
.last
.mtype
1019 redef class AVardeclExpr
1020 redef fun accept_typing
(v
)
1022 var variable
= self.variable
1023 if variable
== null then return # Skip error
1025 var ntype
= self.n_type
1026 var mtype
: nullable MType
1027 if ntype
== null then
1030 mtype
= v
.resolve_mtype
(ntype
)
1031 if mtype
== null then return # Skip error
1034 var nexpr
= self.n_expr
1035 if nexpr
!= null then
1036 if mtype
!= null then
1037 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
1038 if etype
== mtype
then
1039 assert ntype
!= null
1040 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
1043 mtype
= v
.visit_expr
(nexpr
)
1044 if mtype
== null then return # Skip error
1048 var decltype
= mtype
1049 if mtype
== null or mtype
isa MNullType then
1050 var objclass
= v
.get_mclass
(self, "Object")
1051 if objclass
== null then return # skip error
1052 decltype
= objclass
.mclass_type
.as_nullable
1053 if mtype
== null then mtype
= decltype
1056 variable
.declared_type
= decltype
1057 v
.set_variable
(self, variable
, mtype
)
1059 #debug("var {variable}: {mtype}")
1062 self.is_typed
= true
1066 redef class AVarExpr
1067 redef fun its_variable
do return self.variable
1068 redef fun accept_typing
(v
)
1070 var variable
= self.variable
1071 if variable
== null then return # Skip error
1073 var mtype
= v
.get_variable
(self, variable
)
1074 if mtype
!= null then
1075 #debug("{variable} is {mtype}")
1077 #debug("{variable} is untyped")
1084 redef class AVarAssignExpr
1085 redef fun accept_typing
(v
)
1087 var variable
= self.variable
1088 assert variable
!= null
1090 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
1092 v
.set_variable
(self, variable
, mtype
)
1094 self.is_typed
= true
1098 redef class AReassignFormExpr
1099 # The method designed by the reassign operator.
1100 var reassign_callsite
: nullable CallSite
1102 var read_type
: nullable MType = null
1104 # Determine the `reassign_property`
1105 # `readtype` is the type of the reading of the left value.
1106 # `writetype` is the type of the writing of the left value.
1107 # (Because of `ACallReassignExpr`, both can be different.
1108 # Return the static type of the value to store.
1109 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
1111 var reassign_name
= self.n_assign_op
.operator
1113 self.read_type
= readtype
1115 var callsite
= v
.get_method
(self.n_assign_op
, readtype
, reassign_name
, false)
1116 if callsite
== null then return null # Skip error
1117 self.reassign_callsite
= callsite
1119 var msignature
= callsite
.msignature
1120 var rettype
= msignature
.return_mtype
1121 assert msignature
.arity
== 1 and rettype
!= null
1123 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
1124 if value_type
== null then return null # Skip error
1126 v
.check_subtype
(self, rettype
, writetype
, false)
1131 redef class AVarReassignExpr
1132 redef fun accept_typing
(v
)
1134 var variable
= self.variable
1135 assert variable
!= null
1137 var readtype
= v
.get_variable
(self, variable
)
1138 if readtype
== null then return
1140 read_type
= readtype
1142 var writetype
= variable
.declared_type
1143 if writetype
== null then return
1145 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
1147 v
.set_variable
(self, variable
, rettype
)
1149 self.is_typed
= rettype
!= null
1154 redef class AContinueExpr
1155 redef fun accept_typing
(v
)
1157 var nexpr
= self.n_expr
1158 if nexpr
!= null then
1161 self.is_typed
= true
1165 redef class ABreakExpr
1166 redef fun accept_typing
(v
)
1168 var nexpr
= self.n_expr
1169 if nexpr
!= null then
1172 self.is_typed
= true
1176 redef class AReturnExpr
1177 redef fun accept_typing
(v
)
1179 var nexpr
= self.n_expr
1181 var mpropdef
= v
.mpropdef
1182 if mpropdef
isa MMethodDef then
1183 ret_type
= mpropdef
.msignature
.return_mtype
1184 else if mpropdef
isa MAttributeDef then
1185 ret_type
= mpropdef
.static_mtype
1189 if nexpr
!= null then
1190 if ret_type
!= null then
1191 v
.visit_expr_subtype
(nexpr
, ret_type
)
1194 v
.error
(nexpr
, "Error: `return` with value in a procedure.")
1197 else if ret_type
!= null then
1198 v
.error
(self, "Error: `return` without value in a function.")
1201 self.is_typed
= true
1205 redef class AAbortExpr
1206 redef fun accept_typing
(v
)
1208 self.is_typed
= true
1213 redef fun accept_typing
(v
)
1215 v
.visit_expr_bool
(n_expr
)
1217 v
.visit_stmt
(n_then
)
1218 v
.visit_stmt
(n_else
)
1220 self.is_typed
= true
1222 if n_then
!= null and n_else
== null then
1223 self.mtype
= n_then
.mtype
1228 redef class AIfexprExpr
1229 redef fun accept_typing
(v
)
1231 v
.visit_expr_bool
(n_expr
)
1233 var t1
= v
.visit_expr
(n_then
)
1234 var t2
= v
.visit_expr
(n_else
)
1236 if t1
== null or t2
== null then
1240 var t
= v
.merge_types
(self, [t1
, t2
])
1242 v
.error
(self, "Type Error: ambiguous type `{t1}` vs `{t2}`.")
1249 redef fun accept_typing
(v
)
1251 v
.visit_stmt
(n_block
)
1252 v
.visit_stmt
(n_catch
)
1253 self.is_typed
= true
1257 redef class AWhileExpr
1258 redef fun accept_typing
(v
)
1261 v
.visit_expr_bool
(n_expr
)
1262 v
.visit_stmt
(n_block
)
1263 self.is_typed
= true
1267 redef class ALoopExpr
1268 redef fun accept_typing
(v
)
1271 v
.visit_stmt
(n_block
)
1272 self.is_typed
= true
1276 redef class AForExpr
1277 redef fun accept_typing
(v
)
1281 for g
in n_groups
do
1282 var mtype
= v
.visit_expr
(g
.n_expr
)
1283 if mtype
== null then return
1284 g
.do_type_iterator
(v
, mtype
)
1285 if g
.is_broken
then is_broken
= true
1288 v
.visit_stmt
(n_block
)
1290 self.mtype
= n_block
.mtype
1291 self.is_typed
= true
1295 redef class AForGroup
1296 var coltype
: nullable MClassType
1298 var method_iterator
: nullable CallSite
1299 var method_is_ok
: nullable CallSite
1300 var method_item
: nullable CallSite
1301 var method_next
: nullable CallSite
1302 var method_key
: nullable CallSite
1303 var method_finish
: nullable CallSite
1305 var method_lt
: nullable CallSite
1306 var method_successor
: nullable CallSite
1308 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1310 if mtype
isa MNullType then
1311 v
.error
(self, "Type Error: `for` cannot iterate over `null`.")
1316 var objcla
= v
.get_mclass
(self, "Object")
1317 if objcla
== null then return
1319 # check iterator method
1320 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1321 if itdef
== null then
1322 v
.error
(self, "Type Error: `for` expects a type providing an `iterator` method, got `{mtype}`.")
1325 self.method_iterator
= itdef
1327 # check that iterator return something
1328 var ittype
= itdef
.msignature
.return_mtype
1329 if ittype
== null then
1330 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1335 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1336 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1340 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1342 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1343 var variables
= self.variables
1344 if variables
.length
!= 1 then
1345 v
.error
(self, "Type Error: `for` expects only one variable when using `Iterator`.")
1347 variables
.first
.declared_type
= coltype
.arguments
.first
1352 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1354 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1355 var variables
= self.variables
1356 if variables
.length
!= 2 then
1357 v
.error
(self, "Type Error: `for` expects two variables when using `MapIterator`.")
1359 variables
[0].declared_type
= coltype
.arguments
[0]
1360 variables
[1].declared_type
= coltype
.arguments
[1]
1365 if not is_col
and not is_map
then
1366 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1370 # anchor formal and virtual types
1371 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1373 mtype
= mtype
.undecorate
1374 self.coltype
= mtype
.as(MClassType)
1376 # get methods is_ok, next, item
1377 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1378 if ikdef
== null then
1379 v
.error
(self, "Type Error: `for` expects a method `is_ok` in type `{ittype}`.")
1382 self.method_is_ok
= ikdef
1384 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1385 if itemdef
== null then
1386 v
.error
(self, "Type Error: `for` expects a method `item` in type `{ittype}`.")
1389 self.method_item
= itemdef
1391 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1392 if nextdef
== null then
1393 v
.error
(self, "Type Error: `for` expects a method `next` in type {ittype}.")
1396 self.method_next
= nextdef
1398 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1401 var keydef
= v
.get_method
(self, ittype
, "key", false)
1402 if keydef
== null then
1403 v
.error
(self, "Type Error: `for` expects a method `key` in type `{ittype}`.")
1406 self.method_key
= keydef
1409 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1410 var variable
= variables
.first
1411 var vtype
= variable
.declared_type
.as(not null)
1413 if n_expr
isa AOrangeExpr then
1414 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1416 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1419 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1424 redef class AWithExpr
1425 var method_start
: nullable CallSite
1426 var method_finish
: nullable CallSite
1428 redef fun accept_typing
(v
: TypeVisitor)
1430 var mtype
= v
.visit_expr
(n_expr
)
1431 if mtype
== null then return
1433 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1434 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1436 v
.visit_stmt
(n_block
)
1437 self.mtype
= n_block
.mtype
1438 self.is_typed
= true
1442 redef class AAssertExpr
1443 redef fun accept_typing
(v
)
1445 v
.visit_expr_bool
(n_expr
)
1447 v
.visit_stmt
(n_else
)
1448 self.is_typed
= true
1453 redef fun accept_typing
(v
)
1455 v
.visit_expr_bool
(n_expr
)
1456 v
.visit_expr_bool
(n_expr2
)
1457 self.mtype
= v
.type_bool
(self)
1461 redef class AImpliesExpr
1462 redef fun accept_typing
(v
)
1464 v
.visit_expr_bool
(n_expr
)
1465 v
.visit_expr_bool
(n_expr2
)
1466 self.mtype
= v
.type_bool
(self)
1470 redef class AAndExpr
1471 redef fun accept_typing
(v
)
1473 v
.visit_expr_bool
(n_expr
)
1474 v
.visit_expr_bool
(n_expr2
)
1475 self.mtype
= v
.type_bool
(self)
1480 redef class ANotExpr
1481 redef fun accept_typing
(v
)
1483 v
.visit_expr_bool
(n_expr
)
1484 self.mtype
= v
.type_bool
(self)
1488 redef class AOrElseExpr
1489 redef fun accept_typing
(v
)
1491 var t1
= v
.visit_expr
(n_expr
)
1492 var t2
= v
.visit_expr
(n_expr2
)
1494 if t1
== null or t2
== null then
1498 if t1
isa MNullType then
1501 else if v
.can_be_null
(t1
) then
1505 var t
= v
.merge_types
(self, [t1
, t2
])
1507 var c
= v
.get_mclass
(self, "Object")
1508 if c
== null then return # forward error
1510 if v
.can_be_null
(t2
) then
1513 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1518 redef fun accept_post_typing
(v
)
1520 var t1
= n_expr
.mtype
1524 v
.check_can_be_null
(n_expr
, t1
)
1529 redef class ATrueExpr
1530 redef fun accept_typing
(v
)
1532 self.mtype
= v
.type_bool
(self)
1536 redef class AFalseExpr
1537 redef fun accept_typing
(v
)
1539 self.mtype
= v
.type_bool
(self)
1543 redef class AIntegerExpr
1544 redef fun accept_typing
(v
)
1546 var mclass
: nullable MClass = null
1547 if value
isa Byte then
1548 mclass
= v
.get_mclass
(self, "Byte")
1549 else if value
isa Int then
1550 mclass
= v
.get_mclass
(self, "Int")
1551 else if value
isa Int8 then
1552 mclass
= v
.get_mclass
(self, "Int8")
1553 else if value
isa Int16 then
1554 mclass
= v
.get_mclass
(self, "Int16")
1555 else if value
isa UInt16 then
1556 mclass
= v
.get_mclass
(self, "UInt16")
1557 else if value
isa Int32 then
1558 mclass
= v
.get_mclass
(self, "Int32")
1559 else if value
isa UInt32 then
1560 mclass
= v
.get_mclass
(self, "UInt32")
1562 if mclass
== null then return # Forward error
1563 self.mtype
= mclass
.mclass_type
1567 redef class AFloatExpr
1568 redef fun accept_typing
(v
)
1570 var mclass
= v
.get_mclass
(self, "Float")
1571 if mclass
== null then return # Forward error
1572 self.mtype
= mclass
.mclass_type
1576 redef class ACharExpr
1577 redef fun accept_typing
(v
) do
1578 var mclass
: nullable MClass = null
1580 mclass
= v
.get_mclass
(self, "Byte")
1581 else if is_code_point
then
1582 mclass
= v
.get_mclass
(self, "Int")
1584 mclass
= v
.get_mclass
(self, "Char")
1586 if mclass
== null then return # Forward error
1587 self.mtype
= mclass
.mclass_type
1591 redef class AugmentedStringFormExpr
1594 # Text::to_re, used for prefix `re`
1595 var to_re
: nullable CallSite = null
1596 # Regex::ignore_case, used for suffix `i` on `re`
1597 var ignore_case
: nullable CallSite = null
1598 # Regex::newline, used for suffix `m` on `re`
1599 var newline
: nullable CallSite = null
1600 # Regex::extended, used for suffix `b` on `re`
1601 var extended
: nullable CallSite = null
1602 # CString::to_bytes_with_copy, used for prefix `b`
1603 var to_bytes_with_copy
: nullable CallSite = null
1605 redef fun accept_typing
(v
) do
1606 var mclass
= v
.get_mclass
(self, "String")
1607 if mclass
== null then return # Forward error
1608 if is_bytestring
then
1609 to_bytes_with_copy
= v
.get_method
(self, v
.mmodule
.c_string_type
, "to_bytes_with_copy", false)
1610 mclass
= v
.get_mclass
(self, "Bytes")
1612 to_re
= v
.get_method
(self, mclass
.mclass_type
, "to_re", false)
1613 for i
in suffix
.chars
do
1614 mclass
= v
.get_mclass
(self, "Regex")
1615 if mclass
== null then
1616 v
.error
(self, "Error: `Regex` class unknown")
1621 service
= "ignore_case="
1622 ignore_case
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1623 else if i
== 'm' then
1624 service
= "newline="
1625 newline
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1626 else if i
== 'b' then
1627 service
= "extended="
1628 extended
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1630 v
.error
(self, "Type Error: Unrecognized suffix {i} in prefixed Regex")
1635 if mclass
== null then return # Forward error
1636 mtype
= mclass
.mclass_type
1640 redef class ASuperstringExpr
1641 redef fun accept_typing
(v
)
1644 var objclass
= v
.get_mclass
(self, "Object")
1645 if objclass
== null then return # Forward error
1646 var objtype
= objclass
.mclass_type
1647 for nexpr
in self.n_exprs
do
1648 v
.visit_expr_subtype
(nexpr
, objtype
)
1653 redef class AArrayExpr
1654 # The `with_capacity` method on Array
1655 var with_capacity_callsite
: nullable CallSite
1657 # The `push` method on arrays
1658 var push_callsite
: nullable CallSite
1660 # The element of each type
1661 var element_mtype
: nullable MType
1663 # Set that `self` is a part of comprehension array `na`
1664 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1665 private fun set_comprehension
(n
: nullable AExpr)
1669 else if n
isa AForExpr then
1670 set_comprehension
(n
.n_block
)
1671 else if n
isa AIfExpr then
1672 set_comprehension
(n
.n_then
)
1673 set_comprehension
(n
.n_else
)
1676 n
.comprehension
= self
1679 redef fun accept_typing
(v
)
1681 var mtype
: nullable MType = null
1682 var ntype
= self.n_type
1683 if ntype
!= null then
1684 mtype
= v
.resolve_mtype
(ntype
)
1685 if mtype
== null then return # Skip error
1687 var mtypes
= new Array[nullable MType]
1689 for e
in self.n_exprs
do
1690 var t
= v
.visit_expr
(e
)
1694 set_comprehension
(e
)
1695 if mtype
!= null then
1696 if v
.check_subtype
(e
, t
, mtype
, false) == null then return # Forward error
1697 if t
== mtype
then useless
= true
1702 if mtype
== null then
1703 # Ensure monotony for type adaptation on loops
1704 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1705 mtype
= v
.merge_types
(self, mtypes
)
1707 if mtype
== null or mtype
isa MNullType then
1708 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1712 assert ntype
!= null
1713 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1716 self.element_mtype
= mtype
1718 var mclass
= v
.get_mclass
(self, "Array")
1719 if mclass
== null then return # Forward error
1720 var array_mtype
= mclass
.get_mtype
([mtype
])
1722 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1723 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1725 self.mtype
= array_mtype
1729 redef class ARangeExpr
1730 var init_callsite
: nullable CallSite
1732 redef fun accept_typing
(v
)
1734 var discrete_class
= v
.get_mclass
(self, "Discrete")
1735 if discrete_class
== null then return # Forward error
1736 var discrete_type
= discrete_class
.intro
.bound_mtype
1737 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1738 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1739 if t1
== null or t2
== null then return
1740 var mclass
= v
.get_mclass
(self, "Range")
1741 if mclass
== null then return # Forward error
1743 if v
.is_subtype
(t1
, t2
) then
1744 mtype
= mclass
.get_mtype
([t2
])
1745 else if v
.is_subtype
(t2
, t1
) then
1746 mtype
= mclass
.get_mtype
([t1
])
1748 v
.error
(self, "Type Error: cannot create range: `{t1}` vs `{t2}`.")
1754 # get the constructor
1756 if self isa ACrangeExpr then
1757 callsite
= v
.get_method
(self, mtype
, "init", false)
1758 else if self isa AOrangeExpr then
1759 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1763 init_callsite
= callsite
1767 redef class ANullExpr
1768 redef fun accept_typing
(v
)
1770 self.mtype
= v
.mmodule
.model
.null_type
1774 redef class AIsaExpr
1775 # The static type to cast to.
1776 # (different from the static type of the expression that is `Bool`).
1777 var cast_type
: nullable MType
1778 redef fun accept_typing
(v
)
1780 v
.visit_expr
(n_expr
)
1782 var mtype
= v
.resolve_mtype
(n_type
)
1784 self.cast_type
= mtype
1786 var variable
= self.n_expr
.its_variable
1787 if variable
!= null then
1788 var orig
= self.n_expr
.mtype
1789 #var from = if orig != null then orig.to_s else "invalid"
1790 #var to = if mtype != null then mtype.to_s else "invalid"
1791 #debug("adapt {variable}: {from} -> {to}")
1793 var thentype
= v
.intersect_types
(self, orig
, mtype
)
1794 if thentype
!= orig
then
1795 self.after_flow_context
.when_true
.set_var
(v
, variable
, thentype
)
1796 #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> then {thentype or else "?"}"
1799 var elsetype
= v
.diff_types
(self, orig
, mtype
)
1800 if elsetype
!= orig
then
1801 self.after_flow_context
.when_false
.set_var
(v
, variable
, elsetype
)
1802 #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> else {elsetype or else "?"}"
1806 self.mtype
= v
.type_bool
(self)
1809 redef fun accept_post_typing
(v
)
1811 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1814 redef fun dump_info
(v
) do
1816 var mtype
= self.cast_type
1817 if mtype
!= null then
1818 res
+= v
.yellow
(".as({mtype})")
1825 redef class AAsCastExpr
1826 redef fun accept_typing
(v
)
1828 v
.visit_expr
(n_expr
)
1830 self.mtype
= v
.resolve_mtype
(n_type
)
1833 redef fun accept_post_typing
(v
)
1835 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1839 redef class AAsNotnullExpr
1840 redef fun accept_typing
(v
)
1842 var mtype
= v
.visit_expr
(self.n_expr
)
1843 if mtype
== null then return # Forward error
1845 if mtype
isa MNullType then
1846 v
.error
(self, "Type Error: `as(not null)` on `null`.")
1850 if v
.can_be_null
(mtype
) then
1851 mtype
= mtype
.as_notnull
1857 redef fun accept_post_typing
(v
)
1859 var mtype
= n_expr
.mtype
1860 if mtype
== null then return
1861 v
.check_can_be_null
(n_expr
, mtype
)
1865 redef class AParExpr
1866 redef fun accept_typing
(v
)
1868 self.mtype
= v
.visit_expr
(self.n_expr
)
1872 redef class AOnceExpr
1873 redef fun accept_typing
(v
)
1875 self.mtype
= v
.visit_expr
(self.n_expr
)
1879 redef class ASelfExpr
1880 redef var its_variable
: nullable Variable
1881 redef fun accept_typing
(v
)
1883 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1884 v
.error
(self, "Error: `self` cannot be used in top-level method.")
1886 var variable
= v
.selfvariable
1887 self.its_variable
= variable
1888 self.mtype
= v
.get_variable
(self, variable
)
1892 redef class AImplicitSelfExpr
1893 # Is the implicit receiver `sys`?
1895 # By default, the implicit receiver is `self`.
1896 # But when there is not method for `self`, `sys` is used as a fall-back.
1897 # Is this case this flag is set to `true`.
1901 ## MESSAGE SENDING AND PROPERTY
1903 redef class ASendExpr
1904 # The property invoked by the send.
1905 var callsite
: nullable CallSite
1907 redef fun bad_expr_message
(child
)
1909 if child
== self.n_expr
then
1910 return "to be the receiver of `{self.property_name}`"
1915 redef fun accept_typing
(v
)
1917 var nrecv
= self.n_expr
1918 var recvtype
= v
.visit_expr
(nrecv
)
1919 var name
= self.property_name
1920 var node
= self.property_node
1922 if recvtype
== null then return # Forward error
1925 var unsafe_type
= v
.anchor_to
(recvtype
)
1926 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1927 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1928 # Special fall-back search in `sys` when noting found in the implicit receiver.
1929 var sysclass
= v
.try_get_mclass
(node
, "Sys")
1930 if sysclass
!= null then
1931 var systype
= sysclass
.mclass_type
1932 mproperty
= v
.try_get_mproperty_by_name2
(node
, systype
, name
)
1933 if mproperty
!= null then
1934 callsite
= v
.get_method
(node
, systype
, name
, false)
1935 if callsite
== null then return # Forward error
1936 # Update information, we are looking at `sys` now, not `self`
1938 nrecv
.its_variable
= null
1939 nrecv
.mtype
= systype
1944 if callsite
== null then
1945 # If still nothing, just exit
1946 callsite
= v
.get_method
(node
, recvtype
, name
, nrecv
isa ASelfExpr)
1947 if callsite
== null then return
1950 self.callsite
= callsite
1951 var msignature
= callsite
.msignature
1953 var args
= compute_raw_arguments
1955 callsite
.check_signature
(v
, node
, args
)
1957 if callsite
.mproperty
.is_init
then
1958 var vmpropdef
= v
.mpropdef
1959 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1960 v
.error
(node
, "Error: an `init` can only be called from another `init`.")
1962 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1963 v
.error
(node
, "Error: `{vmpropdef}` cannot call a factory `{callsite.mproperty}`.")
1967 var ret
= msignature
.return_mtype
1971 self.is_typed
= true
1975 # The name of the property
1976 # Each subclass simply provide the correct name.
1977 private fun property_name
: String is abstract
1979 # The node identifying the name (id, operator, etc) for messages.
1981 # Is `self` by default
1982 private fun property_node
: ANode do return self
1984 # An array of all arguments (excluding self)
1985 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1987 private fun compute_raw_arguments
: Array[AExpr] is abstract
1989 redef fun dump_info
(v
) do
1991 var callsite
= self.callsite
1992 if callsite
!= null then
1993 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
1999 redef class ABinopExpr
2000 redef fun compute_raw_arguments
do return [n_expr2
]
2001 redef fun property_name
do return operator
2002 redef fun property_node
do return n_op
2005 redef class AEqFormExpr
2006 redef fun accept_typing
(v
)
2012 redef fun accept_post_typing
(v
)
2014 var mtype
= n_expr
.mtype
2015 var mtype2
= n_expr2
.mtype
2017 if mtype
== null or mtype2
== null then return
2019 if not mtype2
isa MNullType then return
2021 v
.check_can_be_null
(n_expr
, mtype
)
2025 redef class AUnaryopExpr
2026 redef fun property_name
do return "unary {operator}"
2027 redef fun compute_raw_arguments
do return new Array[AExpr]
2031 redef class ACallExpr
2032 redef fun property_name
do return n_qid
.n_id
.text
2033 redef fun property_node
do return n_qid
2034 redef fun compute_raw_arguments
do return n_args
.to_a
2037 redef class ACallAssignExpr
2038 redef fun property_name
do return n_qid
.n_id
.text
+ "="
2039 redef fun property_node
do return n_qid
2040 redef fun compute_raw_arguments
2042 var res
= n_args
.to_a
2048 redef class ABraExpr
2049 redef fun property_name
do return "[]"
2050 redef fun compute_raw_arguments
do return n_args
.to_a
2053 redef class ABraAssignExpr
2054 redef fun property_name
do return "[]="
2055 redef fun compute_raw_arguments
2057 var res
= n_args
.to_a
2063 redef class ASendReassignFormExpr
2064 # The property invoked for the writing
2065 var write_callsite
: nullable CallSite
2067 redef fun accept_typing
(v
)
2069 var recvtype
= v
.visit_expr
(self.n_expr
)
2070 var name
= self.property_name
2071 var node
= self.property_node
2073 if recvtype
== null then return # Forward error
2075 var for_self
= self.n_expr
isa ASelfExpr
2076 var callsite
= v
.get_method
(node
, recvtype
, name
, for_self
)
2078 if callsite
== null then return
2079 self.callsite
= callsite
2081 var args
= compute_raw_arguments
2083 callsite
.check_signature
(v
, node
, args
)
2085 var readtype
= callsite
.msignature
.return_mtype
2086 if readtype
== null then
2087 v
.error
(node
, "Error: `{name}` is not a function.")
2091 var wcallsite
= v
.get_method
(node
, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
2092 if wcallsite
== null then return
2093 self.write_callsite
= wcallsite
2095 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
2096 if wtype
== null then return
2098 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
2099 args
.add
(self.n_value
)
2100 wcallsite
.check_signature
(v
, node
, args
)
2102 self.is_typed
= true
2106 redef class ACallReassignExpr
2107 redef fun property_name
do return n_qid
.n_id
.text
2108 redef fun property_node
do return n_qid
.n_id
2109 redef fun compute_raw_arguments
do return n_args
.to_a
2112 redef class ABraReassignExpr
2113 redef fun property_name
do return "[]"
2114 redef fun compute_raw_arguments
do return n_args
.to_a
2117 redef class AInitExpr
2118 redef fun property_name
do return "init"
2119 redef fun property_node
do return n_kwinit
2120 redef fun compute_raw_arguments
do return n_args
.to_a
2124 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
2129 redef class ASuperExpr
2130 # The method to call if the super is in fact a 'super init call'
2131 # Note: if the super is a normal call-next-method, then this attribute is null
2132 var callsite
: nullable CallSite
2134 # The method to call is the super is a standard `call-next-method` super-call
2135 # Note: if the super is a special super-init-call, then this attribute is null
2136 var mpropdef
: nullable MMethodDef
2138 redef fun accept_typing
(v
)
2140 var anchor
= v
.anchor
2141 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2142 assert recvtype
!= null
2143 var mproperty
= v
.mpropdef
.mproperty
2144 if not mproperty
isa MMethod then
2145 v
.error
(self, "Error: `super` only usable in a `method`.")
2148 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
2149 if superprops
.length
== 0 then
2150 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
2151 process_superinit
(v
)
2154 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2157 # FIXME: covariance of return type in linear extension?
2158 var superprop
= superprops
.first
2160 var msignature
= superprop
.msignature
.as(not null)
2161 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2162 var args
= self.n_args
.to_a
2163 if args
.length
> 0 then
2164 signaturemap
= v
.check_signature
(self, args
, mproperty
, msignature
)
2166 self.mtype
= msignature
.return_mtype
2167 self.is_typed
= true
2168 v
.mpropdef
.has_supercall
= true
2169 mpropdef
= v
.mpropdef
.as(MMethodDef)
2172 # The mapping used on the call to associate arguments to parameters.
2173 # If null then no specific association is required.
2174 var signaturemap
: nullable SignatureMap
2176 private fun process_superinit
(v
: TypeVisitor)
2178 var anchor
= v
.anchor
2179 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2180 assert recvtype
!= null
2181 var mpropdef
= v
.mpropdef
2182 assert mpropdef
isa MMethodDef
2183 var mproperty
= mpropdef
.mproperty
2184 var superprop
: nullable MMethodDef = null
2185 for msupertype
in mpropdef
.mclassdef
.supertypes
do
2186 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
2187 var errcount
= v
.modelbuilder
.toolcontext
.error_count
2188 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
2189 if candidate
== null then
2190 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
2191 continue # Try next super-class
2193 if superprop
!= null and candidate
.is_root_init
then
2196 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
2197 v
.error
(self, "Error: conflicting super constructor to call for `{mproperty}`: `{candidate.full_name}`, `{superprop.mproperty.full_name}`")
2200 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
2201 if superprop
!= null and superprop
.mproperty
== candidate
then
2202 if superprop
== candidatedefs
.first
then continue
2203 candidatedefs
.add
(superprop
)
2205 if candidatedefs
.length
> 1 then
2206 v
.error
(self, "Error: conflicting property definitions for property `{mproperty}` in `{recvtype}`: {candidatedefs.join(", ")}")
2209 superprop
= candidatedefs
.first
2211 if superprop
== null then
2212 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2216 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
2217 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2219 var callsite
= new CallSite(hot_location
, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
2220 self.callsite
= callsite
2222 var args
= self.n_args
.to_a
2223 if args
.length
> 0 then
2224 callsite
.check_signature
(v
, self, args
)
2226 # Check there is at least enough parameters
2227 if mpropdef
.msignature
.arity
< msignature
.arity
then
2228 v
.error
(self, "Error: not enough implicit arguments to pass. Got `{mpropdef.msignature.arity}`, expected at least `{msignature.arity}`. Signature is `{msignature}`.")
2231 # Check that each needed parameter is conform
2233 for sp
in msignature
.mparameters
do
2234 var p
= mpropdef
.msignature
.mparameters
[i
]
2235 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
2236 v
.error
(self, "Type Error: expected argument #{i} of type `{sp.mtype}`, got implicit argument `{p.name}` of type `{p.mtype}`. Signature is {msignature}")
2243 self.is_typed
= true
2246 redef fun dump_info
(v
) do
2248 var callsite
= self.callsite
2249 if callsite
!= null then
2250 res
+= v
.yellow
(" super-init="+callsite
.dump_info
(v
))
2252 var mpropdef
= self.mpropdef
2253 if mpropdef
!= null then
2254 res
+= v
.yellow
(" call-next-method="+mpropdef
.to_s
)
2262 redef class ANewExpr
2263 # The constructor invoked by the new.
2264 var callsite
: nullable CallSite
2266 # The designated type
2267 var recvtype
: nullable MClassType
2269 redef fun accept_typing
(v
)
2271 var recvtype
= v
.resolve_mtype
(self.n_type
)
2272 if recvtype
== null then return
2274 if not recvtype
isa MClassType then
2275 if recvtype
isa MNullableType then
2276 v
.error
(self, "Type Error: cannot instantiate the nullable type `{recvtype}`.")
2278 else if recvtype
isa MFormalType then
2279 v
.error
(self, "Type Error: cannot instantiate the formal type `{recvtype}`.")
2282 v
.error
(self, "Type Error: cannot instantiate the type `{recvtype}`.")
2287 self.recvtype
= recvtype
2288 var kind
= recvtype
.mclass
.kind
2291 var nqid
= self.n_qid
2293 if nqid
!= null then
2294 name
= nqid
.n_id
.text
2300 if name
== "intern" then
2301 if kind
!= concrete_kind
then
2302 v
.error
(self, "Type Error: cannot instantiate {kind} {recvtype}.")
2305 if n_args
.n_exprs
.not_empty
then
2306 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
2310 self.mtype
= recvtype
2314 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
2315 if callsite
== null then return
2317 if not callsite
.mproperty
.is_new
then
2318 if kind
!= concrete_kind
then
2319 v
.error
(self, "Type Error: cannot instantiate {kind} `{recvtype}`.")
2322 self.mtype
= recvtype
2324 self.mtype
= callsite
.msignature
.return_mtype
2325 assert self.mtype
!= null
2328 self.callsite
= callsite
2330 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
2331 v
.error
(self, "Error: `{name}` is not a constructor.")
2335 var args
= n_args
.to_a
2336 callsite
.check_signature
(v
, node
, args
)
2339 redef fun dump_info
(v
) do
2341 var callsite
= self.callsite
2342 if callsite
!= null then
2343 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
2351 redef class AAttrFormExpr
2352 # The attribute accessed.
2353 var mproperty
: nullable MAttribute
2355 # The static type of the attribute.
2356 var attr_type
: nullable MType
2358 # Resolve the attribute accessed.
2359 private fun resolve_property
(v
: TypeVisitor)
2361 var recvtype
= v
.visit_expr
(self.n_expr
)
2362 if recvtype
== null then return # Skip error
2363 var node
= self.n_id
2364 var name
= node
.text
2365 if recvtype
isa MNullType then
2366 v
.error
(node
, "Error: attribute `{name}` access on `null`.")
2370 var unsafe_type
= v
.anchor_to
(recvtype
)
2371 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
2372 if mproperty
== null then
2373 v
.modelbuilder
.error
(node
, "Error: attribute `{name}` does not exist in `{recvtype}`.")
2376 assert mproperty
isa MAttribute
2377 self.mproperty
= mproperty
2379 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
2380 assert mpropdefs
.length
== 1
2381 var mpropdef
= mpropdefs
.first
2382 var attr_type
= mpropdef
.static_mtype
2383 if attr_type
== null then return # skip error
2384 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
2385 self.attr_type
= attr_type
2388 redef fun dump_info
(v
) do
2390 var mproperty
= self.mproperty
2391 var attr_type
= self.attr_type
2392 if mproperty
!= null then
2393 res
+= v
.yellow
(" attr={mproperty}:{attr_type or else "BROKEN"}")
2399 redef class AAttrExpr
2400 redef fun accept_typing
(v
)
2402 self.resolve_property
(v
)
2403 self.mtype
= self.attr_type
2408 redef class AAttrAssignExpr
2409 redef fun accept_typing
(v
)
2411 self.resolve_property
(v
)
2412 var mtype
= self.attr_type
2414 v
.visit_expr_subtype
(self.n_value
, mtype
)
2415 self.is_typed
= mtype
!= null
2419 redef class AAttrReassignExpr
2420 redef fun accept_typing
(v
)
2422 self.resolve_property
(v
)
2423 var mtype
= self.attr_type
2424 if mtype
== null then return # Skip error
2426 var rettype
= self.resolve_reassignment
(v
, mtype
, mtype
)
2428 self.is_typed
= rettype
!= null
2432 redef class AIssetAttrExpr
2433 redef fun accept_typing
(v
)
2435 self.resolve_property
(v
)
2436 var mtype
= self.attr_type
2437 if mtype
== null then return # Skip error
2439 var recvtype
= self.n_expr
.mtype
.as(not null)
2440 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2441 if bound
isa MNullableType then
2442 v
.error
(n_id
, "Type Error: `isset` on a nullable attribute.")
2444 self.mtype
= v
.type_bool
(self)
2448 redef class AVarargExpr
2449 redef fun accept_typing
(v
)
2451 # This kind of pseudo-expression can be only processed trough a signature
2452 # See `check_signature`
2453 # Other cases are a syntax error.
2454 v
.error
(self, "Syntax Error: unexpected `...`.")
2460 redef class ADebugTypeExpr
2461 redef fun accept_typing
(v
)
2463 var expr
= v
.visit_expr
(self.n_expr
)
2464 if expr
== null then return
2465 var unsafe
= v
.anchor_to
(expr
)
2466 var ntype
= self.n_type
2467 var mtype
= v
.resolve_mtype
(ntype
)
2468 if mtype
!= null and mtype
!= expr
then
2469 var umtype
= v
.anchor_to
(mtype
)
2470 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2472 self.is_typed
= true