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
: nullable MClassType = null
45 # The analyzed mclassdef
46 var mclassdef
: nullable MClassDef = null
48 # The analyzed property
49 var mpropdef
: nullable 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
63 if mpropdef
!= null then
64 self.mpropdef
= mpropdef
65 var mclassdef
= mpropdef
.mclassdef
66 self.mclassdef
= mclassdef
67 self.anchor
= mclassdef
.bound_mtype
69 var mclass
= mclassdef
.mclass
71 var selfvariable
= new Variable("self")
72 self.selfvariable
= selfvariable
73 selfvariable
.declared_type
= mclass
.mclass_type
75 var mprop
= mpropdef
.mproperty
76 if mprop
isa MMethod and mprop
.is_new
then
77 is_toplevel_context
= true
82 fun anchor_to
(mtype
: MType): MType
85 if anchor
== null then
86 assert not mtype
.need_anchor
89 return mtype
.anchor_to
(mmodule
, anchor
)
92 fun is_subtype
(sub
, sup
: MType): Bool
94 return sub
.is_subtype
(mmodule
, anchor
, sup
)
97 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
99 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
100 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
104 # Check that `sub` is a subtype of `sup`.
105 # If `sub` is not a valid suptype, then display an error on `node` and return `null`.
106 # If `sub` is a safe subtype of `sup`, then return `sub`.
107 # If `sub` is an unsafe subtype (i.e., an implicit cast is required), then return `sup`.
109 # The point of the return type is to determinate the usable type on an expression when `autocast` is true:
110 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
111 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
112 fun check_subtype
(node
: ANode, sub
, sup
: MType, autocast
: Bool): nullable MType
114 if self.is_subtype
(sub
, sup
) then return sub
115 if autocast
and self.is_subtype
(sub
, self.anchor_to
(sup
)) then
116 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
117 #node.debug("Unsafe typing: expected {sup}, got {sub}")
120 if sup
isa MErrorType then return null # Skip error
121 if sub
.need_anchor
then
122 var u
= anchor_to
(sub
)
123 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}: {u}`.")
125 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}`.")
130 # Visit an expression and do not care about the return value
131 fun visit_stmt
(nexpr
: nullable AExpr)
133 if nexpr
== null then return
134 nexpr
.accept_typing
(self)
137 # Visit an expression and expects that it is not a statement
138 # Return the type of the expression
139 # Display an error and return null if:
140 # * the type cannot be determined or
141 # * `nexpr` is a statement
142 fun visit_expr
(nexpr
: AExpr): nullable MType
144 nexpr
.accept_typing
(self)
145 var mtype
= nexpr
.mtype
146 if mtype
!= null then return mtype
147 if not nexpr
.is_typed
then
148 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
149 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
150 nexpr
.debug
("No return type but no error.")
153 return null # forward error
155 var more_message
= null
157 if p
!= null then more_message
= p
.bad_expr_message
(nexpr
)
158 if more_message
== null then more_message
= "" else more_message
= " " + more_message
159 self.error
(nexpr
, "Error: expected an expression{more_message}.")
163 # Visit an expression and expect its static type is a least a `sup`
164 # Return the type of the expression or null if
165 # * the type cannot be determined or
166 # * `nexpr` is a statement or
167 # * `nexpr` is not a `sup`
168 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
170 var sub
= visit_expr
(nexpr
)
171 if sub
== null then return null # Forward error
173 if sup
== null then return null # Forward error
175 var res
= check_subtype
(nexpr
, sub
, sup
, true)
177 nexpr
.implicit_cast_to
= res
182 # Visit an expression and expect its static type is a `Bool`
183 # Return the type of the expression or null if
184 # * the type cannot be determined or
185 # * `nexpr` is a statement or
186 # * `nexpr` is not a `Bool`
187 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
189 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
193 fun check_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
195 var sub
= nexpr
.mtype
196 if sub
== null then return null # Forward error
198 var sup
= ntype
.mtype
199 if sup
== null then return null # Forward error
202 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}`.")
203 else if self.is_subtype
(sub
, sup
) then
204 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}` since it is a `{sub}`.")
209 # Can `mtype` be null (up to the current knowledge)?
210 fun can_be_null
(mtype
: MType): Bool
212 if mtype
isa MNullableType or mtype
isa MNullType then return true
213 if mtype
isa MFormalType then
214 var x
= anchor_to
(mtype
)
215 if x
isa MNullableType or x
isa MNullType then return true
220 # Check that `mtype` can be null (up to the current knowledge).
222 # If not then display a `useless-null-test` warning on node and return false.
224 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
226 if mtype
isa MNullType then
227 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is always `null`.")
230 if can_be_null
(mtype
) then return true
232 if mtype
isa MFormalType then
233 var res
= anchor_to
(mtype
)
234 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
236 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
241 # Special verification on != and == for null
243 fun null_test
(anode
: ABinopExpr)
245 var mtype
= anode
.n_expr
.mtype
246 var mtype2
= anode
.n_expr2
.mtype
248 if mtype
== null or mtype2
== null then return
250 if not mtype2
isa MNullType then return
252 # Check of useless null
253 if not can_be_null
(mtype
) then return
255 if mtype
isa MNullType then
256 # Because of type adaptation, we cannot just stop here
257 # so return use `null` as a bottom type that will be merged easily (cf) `merge_types`
260 mtype
= mtype
.as_notnull
263 # Check for type adaptation
264 var variable
= anode
.n_expr
.its_variable
265 if variable
== null then return
267 # One is null (mtype2 see above) the other is not null
268 if anode
isa AEqExpr then
269 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype2
)
270 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype
)
271 else if anode
isa ANeExpr then
272 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype2
)
273 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype
)
279 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
281 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
284 fun resolve_mtype
(node
: AType): nullable MType
286 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
289 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
291 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
295 fun get_mclass
(node
: ANode, name
: String): nullable MClass
297 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
301 fun type_bool
(node
: ANode): nullable MType
303 var mclass
= self.get_mclass
(node
, "Bool")
304 if mclass
== null then return null
305 return mclass
.mclass_type
308 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
310 var unsafe_type
= self.anchor_to
(recvtype
)
312 #debug("recv: {recvtype} (aka {unsafe_type})")
313 if recvtype
isa MNullType then
314 var objclass
= get_mclass
(node
, "Object")
315 if objclass
== null then return null # Forward error
316 unsafe_type
= objclass
.mclass_type
319 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
320 if name
== "new" and mproperty
== null then
322 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
325 if mproperty
== null then
327 self.modelbuilder
.error
(node
, "Error: method or variable `{name}` unknown in `{recvtype}`.")
328 else if recvtype
.need_anchor
then
329 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}: {unsafe_type}`.")
331 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}`.")
336 assert mproperty
isa MMethod
338 # `null` only accepts some methods of object.
339 if recvtype
isa MNullType and not mproperty
.is_null_safe
then
340 self.error
(node
, "Error: method `{name}` called on `null`.")
342 else if unsafe_type
isa MNullableType and not mproperty
.is_null_safe
then
343 modelbuilder
.advice
(node
, "call-on-nullable", "Warning: method call on a nullable receiver `{recvtype}`.")
346 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
347 error
(node
, "Error: `{name}` is not a top-level method, thus need a receiver.")
349 if not recv_is_self
and mproperty
.is_toplevel
then
350 error
(node
, "Error: cannot call `{name}`, a top-level method, with a receiver.")
353 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
354 self.modelbuilder
.error
(node
, "Error: method `{name}` is protected and can only accessed by `self`.")
358 var info
= mproperty
.deprecation
359 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
362 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated: {mdoc.content.first}")
364 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated.")
368 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
370 if propdefs
.length
== 0 then
371 self.modelbuilder
.error
(node
, "Type Error: no definition found for property `{name}` in `{unsafe_type}`.")
373 else if propdefs
.length
== 1 then
374 mpropdef
= propdefs
.first
376 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property `{name}` in `{unsafe_type}`: {propdefs.join(" ")}")
377 mpropdef
= mproperty
.intro
381 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
382 if msignature
== null then return null # skip error
383 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
385 var erasure_cast
= false
386 var rettype
= mpropdef
.msignature
.return_mtype
387 if not recv_is_self
and rettype
!= null then
388 rettype
= rettype
.undecorate
389 if rettype
isa MParameterType then
390 var erased_rettype
= msignature
.return_mtype
391 assert erased_rettype
!= null
392 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
397 var callsite
= new CallSite(node
.hot_location
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
401 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
403 var unsafe_type
= self.anchor_to
(recvtype
)
404 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
405 if mproperty
== null then return null
406 return get_method
(node
, recvtype
, name
, recv_is_self
)
410 # Visit the expressions of args and check their conformity with the corresponding type in signature
411 # The point of this method is to handle varargs correctly
412 # Note: The signature must be correctly adapted
413 fun check_signature
(node
: ANode, args
: Array[AExpr], mproperty
: MProperty, msignature
: MSignature): nullable SignatureMap
415 var vararg_rank
= msignature
.vararg_rank
416 if vararg_rank
>= 0 then
417 if args
.length
< msignature
.arity
then
418 modelbuilder
.error
(node
, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
421 else if args
.length
!= msignature
.arity
then
423 if args
.length
> msignature
.arity
then
424 modelbuilder
.error
(node
, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
427 # Other cases are managed later
431 #debug("CALL {unsafe_type}.{msignature}")
433 # Associate each parameter to a position in the arguments
434 var map
= new SignatureMap
436 # Special case for the isolated last argument
437 # TODO: reify this method characteristics (where? the param, the signature, the method?)
438 var last_is_padded
= mproperty
.name
.chars
.last
== '='
439 var nbargs
= args
.length
440 if last_is_padded
then
442 assert not args
.last
isa ANamedargExpr
443 map
.map
[msignature
.arity
- 1] = args
.length
- 1
444 self.visit_expr_subtype
(args
.last
, msignature
.mparameters
.last
.mtype
)
447 # First, handle named arguments
448 for i
in [0..args
.length
[ do
450 if not e
isa ANamedargExpr then continue
451 var name
= e
.n_id
.text
452 var param
= msignature
.mparameter_by_name
(name
)
453 if param
== null then
454 modelbuilder
.error
(e
.n_id
, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
457 var idx
= msignature
.mparameters
.index_of
(param
)
458 var prev
= map
.map
.get_or_null
(idx
)
460 modelbuilder
.error
(e
, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
464 e
.mtype
= self.visit_expr_subtype
(e
.n_expr
, param
.mtype
)
467 # Number of minimum mandatory remaining parameters
470 # Second, associate remaining parameters
471 var vararg_decl
= args
.length
- msignature
.arity
473 for i
in [0..msignature
.arity
[ do
474 # Skip parameters associated by name
475 if map
.map
.has_key
(i
) then continue
477 var param
= msignature
.mparameters
[i
]
479 # Search the next free argument: skip named arguments since they are already associated
480 while j
< nbargs
and args
[j
] isa ANamedargExpr do j
+= 1
482 if not param
.mtype
isa MNullableType then
492 if i
== vararg_rank
then
494 continue # skip the vararg
497 if not param
.is_vararg
then
498 var paramtype
= param
.mtype
499 self.visit_expr_subtype
(arg
, paramtype
)
501 check_one_vararg
(arg
, param
)
505 if min_arity
> 0 then
506 if last_is_padded
then min_arity
+= 1
507 if min_arity
< msignature
.arity
then
508 modelbuilder
.error
(node
, "Error: expected at least {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
510 modelbuilder
.error
(node
, "Error: expected {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
515 # Third, check varargs
516 if vararg_rank
>= 0 then
517 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
518 var first
= args
[vararg_rank
]
519 if vararg_decl
== 0 then
520 if not check_one_vararg
(first
, msignature
.mparameters
[vararg_rank
]) then return null
522 first
.vararg_decl
= vararg_decl
+ 1
523 for i
in [vararg_rank
..vararg_rank
+vararg_decl
] do
524 self.visit_expr_subtype
(args
[i
], paramtype
)
532 # Check an expression as a single vararg.
533 # The main point of the method if to handle the case of reversed vararg (see `AVarargExpr`)
534 fun check_one_vararg
(arg
: AExpr, param
: MParameter): Bool
536 var paramtype
= param
.mtype
537 var mclass
= get_mclass
(arg
, "Array")
538 if mclass
== null then return false # Forward error
539 var array_mtype
= mclass
.get_mtype
([paramtype
])
540 if arg
isa AVarargExpr then
541 self.visit_expr_subtype
(arg
.n_expr
, array_mtype
)
542 arg
.mtype
= arg
.n_expr
.mtype
544 # only one vararg, maybe `...` was forgot, so be gentle!
545 var t
= visit_expr
(arg
)
546 if t
== null then return false # Forward error
547 if not is_subtype
(t
, paramtype
) and is_subtype
(t
, array_mtype
) then
548 # Not acceptable but could be a `...`
549 error
(arg
, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
552 # Standard valid vararg, finish the job
554 self.visit_expr_subtype
(arg
, paramtype
)
559 fun error
(node
: ANode, message
: String)
561 self.modelbuilder
.error
(node
, message
)
564 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
566 if not variable
.is_adapted
then return variable
.declared_type
568 var flow
= node
.after_flow_context
569 if flow
== null then return null # skip error
571 if flow
.vars
.has_key
(variable
) then
572 return flow
.vars
[variable
]
574 #node.debug("*** START Collected for {variable}")
575 var mtypes
= flow
.collect_types
(variable
)
576 #node.debug("**** END Collected for {variable}")
577 if mtypes
.length
== 0 then
578 return variable
.declared_type
579 else if mtypes
.length
== 1 then
582 var res
= merge_types
(node
,mtypes
)
583 if res
== null then res
= variable
.declared_type
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.
739 redef var location
: Location
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}"
787 # The declared type of the variable
788 var declared_type
: nullable MType is writable
790 # Was the variable type-adapted?
791 # This is used to speedup type retrieval while it remains `false`
792 private var is_adapted
= false
795 redef class FlowContext
796 # Store changes of types because of type evolution
797 private var vars
= new HashMap[Variable, nullable MType]
799 # Adapt the variable to a static type
800 # Warning1: do not modify vars directly.
801 # Warning2: sub-flow may have cached a unadapted variable
802 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
804 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
805 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
806 self.vars
[variable
] = mtype
808 variable
.is_adapted
= true
809 #node.debug "set {variable} to {mtype or else "X"}"
812 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
813 private fun collect_types
(variable
: Variable): Array[nullable MType]
815 #node.debug "flow for {variable}"
816 var res
= new Array[nullable MType]
819 var seen
= new HashSet[FlowContext]
820 while not todo
.is_empty
do
822 if f
.is_unreachable
then continue
823 if seen
.has
(f
) then continue
826 if f
.vars
.has_key
(variable
) then
827 # Found something. Collect it and do not process further on this path
828 res
.add f
.vars
[variable
]
829 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
831 todo
.add_all f
.previous
833 if f
.previous
.is_empty
then
834 # Root flowcontext mean a parameter or something related
835 res
.add variable
.declared_type
836 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
840 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
846 # The entry point of the whole typing analysis
847 fun do_typing
(modelbuilder
: ModelBuilder)
851 # The variable associated to the receiver (if any)
852 var selfvariable
: nullable Variable
855 redef class AMethPropdef
856 redef fun do_typing
(modelbuilder
: ModelBuilder)
858 var mpropdef
= self.mpropdef
859 if mpropdef
== null then return # skip error
861 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
862 self.selfvariable
= v
.selfvariable
864 var mmethoddef
= self.mpropdef
.as(not null)
865 var msignature
= mmethoddef
.msignature
866 if msignature
== null then return # skip error
867 for i
in [0..msignature
.arity
[ do
868 var mtype
= msignature
.mparameters
[i
].mtype
869 if msignature
.vararg_rank
== i
then
870 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
871 if arrayclass
== null then return # Skip error
872 mtype
= arrayclass
.get_mtype
([mtype
])
874 var variable
= self.n_signature
.n_params
[i
].variable
875 assert variable
!= null
876 variable
.declared_type
= mtype
879 var nblock
= self.n_block
880 if nblock
== null then return
885 if not v
.has_loop
or not v
.dirty
then break
888 var post_visitor
= new PostTypingVisitor(v
)
889 post_visitor
.enter_visit
(self)
891 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
892 # We reach the end of the function without having a return, it is bad
893 v
.error
(self, "Error: reached end of function; expected `return` with a value.")
898 private class PostTypingVisitor
900 var type_visitor
: TypeVisitor
901 redef fun visit
(n
) do
903 n
.accept_post_typing
(type_visitor
)
904 if n
isa AExpr and n
.mtype
== null and not n
.is_typed
then
911 private fun accept_post_typing
(v
: TypeVisitor) do end
913 # An additional information message to explain the role of a child expression.
915 # The point of the method is to allow some kind of double dispatch so the parent
916 # choose how to describe its children.
917 private fun bad_expr_message
(child
: AExpr): nullable String do return null
920 redef class AAttrPropdef
921 redef fun do_typing
(modelbuilder
: ModelBuilder)
923 if not has_value
then return
925 var mpropdef
= self.mreadpropdef
926 if mpropdef
== null or mpropdef
.msignature
== null then return # skip error
928 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
929 self.selfvariable
= v
.selfvariable
931 var nexpr
= self.n_expr
932 if nexpr
!= null then
933 var mtype
= self.mtype
934 v
.visit_expr_subtype
(nexpr
, mtype
)
936 var nblock
= self.n_block
937 if nblock
!= null then
939 if not nblock
.after_flow_context
.is_unreachable
then
940 # We reach the end of the init without having a return, it is bad
941 v
.error
(self, "Error: reached end of block; expected `return`.")
950 # The static type of the expression.
951 # null if self is a statement or in case of error
952 var mtype
: nullable MType = null
954 # Is the statement correctly typed?
955 # Used to distinguish errors and statements when `mtype == null`
956 var is_typed
: Bool = false
958 # If required, the following implicit cast `.as(XXX)`
959 # Such a cast may by required after evaluating the expression when
960 # a unsafe operation is detected (silently accepted by the Nit language).
961 # The attribute is computed by `check_subtype`
962 var implicit_cast_to
: nullable MType = null
964 # Return the variable read (if any)
965 # Used to perform adaptive typing
966 fun its_variable
: nullable Variable do return null
968 private fun accept_typing
(v
: TypeVisitor)
970 v
.error
(self, "no implemented accept_typing for {self.class_name}")
973 # Is non-null if `self` is a leaf of a comprehension array construction.
974 # In this case, the enclosing literal array node is designated.
975 # The result of the evaluation of `self` must be
976 # stored inside the designated array (there is an implicit `push`)
977 var comprehension
: nullable AArrayExpr = null
979 # It indicates the number of arguments collected as a vararg.
981 # When 0, the argument is used as is, without transformation.
982 # When 1, the argument is transformed into an singleton array.
983 # Above 1, the arguments and the next ones are transformed into a common array.
985 # This attribute is meaning less on expressions not used as attributes.
986 var vararg_decl
: Int = 0
988 redef fun dump_info
(v
) do
990 var mtype
= self.mtype
991 if mtype
!= null then
992 res
+= v
.yellow
(":{mtype}")
994 var ict
= self.implicit_cast_to
996 res
+= v
.yellow
("(.as({ict}))")
1002 redef class ABlockExpr
1003 redef fun accept_typing
(v
)
1005 for e
in self.n_expr
do v
.visit_stmt
(e
)
1006 self.is_typed
= true
1009 # The type of a blockexpr is the one of the last expression (or null if empty)
1012 if self.n_expr
.is_empty
then return null
1013 return self.n_expr
.last
.mtype
1017 redef class AVardeclExpr
1018 redef fun accept_typing
(v
)
1020 var variable
= self.variable
1021 if variable
== null then return # Skip error
1023 var ntype
= self.n_type
1024 var mtype
: nullable MType
1025 if ntype
== null then
1028 mtype
= v
.resolve_mtype
(ntype
)
1029 if mtype
== null then return # Skip error
1032 var nexpr
= self.n_expr
1033 if nexpr
!= null then
1034 if mtype
!= null then
1035 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
1036 if etype
== mtype
then
1037 assert ntype
!= null
1038 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
1041 mtype
= v
.visit_expr
(nexpr
)
1042 if mtype
== null then return # Skip error
1046 var decltype
= mtype
1047 if mtype
== null or mtype
isa MNullType then
1048 var objclass
= v
.get_mclass
(self, "Object")
1049 if objclass
== null then return # skip error
1050 decltype
= objclass
.mclass_type
.as_nullable
1051 if mtype
== null then mtype
= decltype
1054 variable
.declared_type
= decltype
1055 v
.set_variable
(self, variable
, mtype
)
1057 #debug("var {variable}: {mtype}")
1060 self.is_typed
= true
1064 redef class AVarExpr
1065 redef fun its_variable
do return self.variable
1066 redef fun accept_typing
(v
)
1068 var variable
= self.variable
1069 if variable
== null then return # Skip error
1071 var mtype
= v
.get_variable
(self, variable
)
1072 if mtype
!= null then
1073 #debug("{variable} is {mtype}")
1075 #debug("{variable} is untyped")
1082 redef class AVarAssignExpr
1083 redef fun accept_typing
(v
)
1085 var variable
= self.variable
1086 assert variable
!= null
1088 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
1090 v
.set_variable
(self, variable
, mtype
)
1092 self.is_typed
= true
1096 redef class AReassignFormExpr
1097 # The method designed by the reassign operator.
1098 var reassign_callsite
: nullable CallSite
1100 var read_type
: nullable MType = null
1102 # Determine the `reassign_property`
1103 # `readtype` is the type of the reading of the left value.
1104 # `writetype` is the type of the writing of the left value.
1105 # (Because of `ACallReassignExpr`, both can be different.
1106 # Return the static type of the value to store.
1107 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
1109 var reassign_name
= self.n_assign_op
.operator
1111 self.read_type
= readtype
1113 var callsite
= v
.get_method
(self.n_assign_op
, readtype
, reassign_name
, false)
1114 if callsite
== null then return null # Skip error
1115 self.reassign_callsite
= callsite
1117 var msignature
= callsite
.msignature
1118 var rettype
= msignature
.return_mtype
1119 assert msignature
.arity
== 1 and rettype
!= null
1121 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
1122 if value_type
== null then return null # Skip error
1124 v
.check_subtype
(self, rettype
, writetype
, false)
1129 redef class AVarReassignExpr
1130 redef fun accept_typing
(v
)
1132 var variable
= self.variable
1133 assert variable
!= null
1135 var readtype
= v
.get_variable
(self, variable
)
1136 if readtype
== null then return
1138 read_type
= readtype
1140 var writetype
= variable
.declared_type
1141 if writetype
== null then return
1143 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
1145 v
.set_variable
(self, variable
, rettype
)
1147 self.is_typed
= rettype
!= null
1152 redef class AContinueExpr
1153 redef fun accept_typing
(v
)
1155 var nexpr
= self.n_expr
1156 if nexpr
!= null then
1159 self.is_typed
= true
1163 redef class ABreakExpr
1164 redef fun accept_typing
(v
)
1166 var nexpr
= self.n_expr
1167 if nexpr
!= null then
1170 self.is_typed
= true
1174 redef class AReturnExpr
1175 redef fun accept_typing
(v
)
1177 var nexpr
= self.n_expr
1179 var mpropdef
= v
.mpropdef
1180 if mpropdef
isa MMethodDef then
1181 ret_type
= mpropdef
.msignature
.return_mtype
1182 else if mpropdef
isa MAttributeDef then
1183 ret_type
= mpropdef
.static_mtype
1187 if nexpr
!= null then
1188 if ret_type
!= null then
1189 v
.visit_expr_subtype
(nexpr
, ret_type
)
1192 v
.error
(nexpr
, "Error: `return` with value in a procedure.")
1195 else if ret_type
!= null then
1196 v
.error
(self, "Error: `return` without value in a function.")
1199 self.is_typed
= true
1203 redef class AAbortExpr
1204 redef fun accept_typing
(v
)
1206 self.is_typed
= true
1211 redef fun accept_typing
(v
)
1213 v
.visit_expr_bool
(n_expr
)
1215 v
.visit_stmt
(n_then
)
1216 v
.visit_stmt
(n_else
)
1218 self.is_typed
= true
1220 if n_then
!= null and n_else
== null then
1221 self.mtype
= n_then
.mtype
1226 redef class AIfexprExpr
1227 redef fun accept_typing
(v
)
1229 v
.visit_expr_bool
(n_expr
)
1231 var t1
= v
.visit_expr
(n_then
)
1232 var t2
= v
.visit_expr
(n_else
)
1234 if t1
== null or t2
== null then
1238 var t
= v
.merge_types
(self, [t1
, t2
])
1240 v
.error
(self, "Type Error: ambiguous type `{t1}` vs `{t2}`.")
1247 redef fun accept_typing
(v
)
1249 v
.visit_stmt
(n_block
)
1250 v
.visit_stmt
(n_catch
)
1251 self.is_typed
= true
1255 redef class AWhileExpr
1256 redef fun accept_typing
(v
)
1259 v
.visit_expr_bool
(n_expr
)
1260 v
.visit_stmt
(n_block
)
1261 self.is_typed
= true
1265 redef class ALoopExpr
1266 redef fun accept_typing
(v
)
1269 v
.visit_stmt
(n_block
)
1270 self.is_typed
= true
1274 redef class AForExpr
1275 redef fun accept_typing
(v
)
1279 for g
in n_groups
do
1280 var mtype
= v
.visit_expr
(g
.n_expr
)
1281 if mtype
== null then return
1282 g
.do_type_iterator
(v
, mtype
)
1283 if g
.is_broken
then is_broken
= true
1286 v
.visit_stmt
(n_block
)
1288 self.mtype
= n_block
.mtype
1289 self.is_typed
= true
1293 redef class AForGroup
1294 var coltype
: nullable MClassType
1296 var method_iterator
: nullable CallSite
1297 var method_is_ok
: nullable CallSite
1298 var method_item
: nullable CallSite
1299 var method_next
: nullable CallSite
1300 var method_key
: nullable CallSite
1301 var method_finish
: nullable CallSite
1303 var method_lt
: nullable CallSite
1304 var method_successor
: nullable CallSite
1306 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1308 if mtype
isa MNullType then
1309 v
.error
(self, "Type Error: `for` cannot iterate over `null`.")
1314 var objcla
= v
.get_mclass
(self, "Object")
1315 if objcla
== null then return
1317 # check iterator method
1318 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1319 if itdef
== null then
1320 v
.error
(self, "Type Error: `for` expects a type providing an `iterator` method, got `{mtype}`.")
1323 self.method_iterator
= itdef
1325 # check that iterator return something
1326 var ittype
= itdef
.msignature
.return_mtype
1327 if ittype
== null then
1328 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1333 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1334 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1338 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1340 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1341 var variables
= self.variables
1342 if variables
.length
!= 1 then
1343 v
.error
(self, "Type Error: `for` expects only one variable when using `Iterator`.")
1345 variables
.first
.declared_type
= coltype
.arguments
.first
1350 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1352 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1353 var variables
= self.variables
1354 if variables
.length
!= 2 then
1355 v
.error
(self, "Type Error: `for` expects two variables when using `MapIterator`.")
1357 variables
[0].declared_type
= coltype
.arguments
[0]
1358 variables
[1].declared_type
= coltype
.arguments
[1]
1363 if not is_col
and not is_map
then
1364 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1368 # anchor formal and virtual types
1369 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1371 mtype
= mtype
.undecorate
1372 self.coltype
= mtype
.as(MClassType)
1374 # get methods is_ok, next, item
1375 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1376 if ikdef
== null then
1377 v
.error
(self, "Type Error: `for` expects a method `is_ok` in type `{ittype}`.")
1380 self.method_is_ok
= ikdef
1382 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1383 if itemdef
== null then
1384 v
.error
(self, "Type Error: `for` expects a method `item` in type `{ittype}`.")
1387 self.method_item
= itemdef
1389 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1390 if nextdef
== null then
1391 v
.error
(self, "Type Error: `for` expects a method `next` in type {ittype}.")
1394 self.method_next
= nextdef
1396 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1399 var keydef
= v
.get_method
(self, ittype
, "key", false)
1400 if keydef
== null then
1401 v
.error
(self, "Type Error: `for` expects a method `key` in type `{ittype}`.")
1404 self.method_key
= keydef
1407 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1408 var variable
= variables
.first
1409 var vtype
= variable
.declared_type
.as(not null)
1411 if n_expr
isa AOrangeExpr then
1412 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1414 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1417 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1422 redef class AWithExpr
1423 var method_start
: nullable CallSite
1424 var method_finish
: nullable CallSite
1426 redef fun accept_typing
(v
: TypeVisitor)
1428 var mtype
= v
.visit_expr
(n_expr
)
1429 if mtype
== null then return
1431 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1432 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1434 v
.visit_stmt
(n_block
)
1435 self.mtype
= n_block
.mtype
1436 self.is_typed
= true
1440 redef class AAssertExpr
1441 redef fun accept_typing
(v
)
1443 v
.visit_expr_bool
(n_expr
)
1445 v
.visit_stmt
(n_else
)
1446 self.is_typed
= true
1451 redef fun accept_typing
(v
)
1453 v
.visit_expr_bool
(n_expr
)
1454 v
.visit_expr_bool
(n_expr2
)
1455 self.mtype
= v
.type_bool
(self)
1459 redef class AImpliesExpr
1460 redef fun accept_typing
(v
)
1462 v
.visit_expr_bool
(n_expr
)
1463 v
.visit_expr_bool
(n_expr2
)
1464 self.mtype
= v
.type_bool
(self)
1468 redef class AAndExpr
1469 redef fun accept_typing
(v
)
1471 v
.visit_expr_bool
(n_expr
)
1472 v
.visit_expr_bool
(n_expr2
)
1473 self.mtype
= v
.type_bool
(self)
1478 redef class ANotExpr
1479 redef fun accept_typing
(v
)
1481 v
.visit_expr_bool
(n_expr
)
1482 self.mtype
= v
.type_bool
(self)
1486 redef class AOrElseExpr
1487 redef fun accept_typing
(v
)
1489 var t1
= v
.visit_expr
(n_expr
)
1490 var t2
= v
.visit_expr
(n_expr2
)
1492 if t1
== null or t2
== null then
1496 if t1
isa MNullType then
1499 else if v
.can_be_null
(t1
) then
1503 var t
= v
.merge_types
(self, [t1
, t2
])
1505 var c
= v
.get_mclass
(self, "Object")
1506 if c
== null then return # forward error
1508 if v
.can_be_null
(t2
) then
1511 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1516 redef fun accept_post_typing
(v
)
1518 var t1
= n_expr
.mtype
1522 v
.check_can_be_null
(n_expr
, t1
)
1527 redef class ATrueExpr
1528 redef fun accept_typing
(v
)
1530 self.mtype
= v
.type_bool
(self)
1534 redef class AFalseExpr
1535 redef fun accept_typing
(v
)
1537 self.mtype
= v
.type_bool
(self)
1541 redef class AIntegerExpr
1542 redef fun accept_typing
(v
)
1544 var mclass
: nullable MClass = null
1545 if value
isa Byte then
1546 mclass
= v
.get_mclass
(self, "Byte")
1547 else if value
isa Int then
1548 mclass
= v
.get_mclass
(self, "Int")
1549 else if value
isa Int8 then
1550 mclass
= v
.get_mclass
(self, "Int8")
1551 else if value
isa Int16 then
1552 mclass
= v
.get_mclass
(self, "Int16")
1553 else if value
isa UInt16 then
1554 mclass
= v
.get_mclass
(self, "UInt16")
1555 else if value
isa Int32 then
1556 mclass
= v
.get_mclass
(self, "Int32")
1557 else if value
isa UInt32 then
1558 mclass
= v
.get_mclass
(self, "UInt32")
1560 if mclass
== null then return # Forward error
1561 self.mtype
= mclass
.mclass_type
1565 redef class AFloatExpr
1566 redef fun accept_typing
(v
)
1568 var mclass
= v
.get_mclass
(self, "Float")
1569 if mclass
== null then return # Forward error
1570 self.mtype
= mclass
.mclass_type
1574 redef class ACharExpr
1575 redef fun accept_typing
(v
) do
1576 var mclass
: nullable MClass = null
1578 mclass
= v
.get_mclass
(self, "Byte")
1579 else if is_code_point
then
1580 mclass
= v
.get_mclass
(self, "Int")
1582 mclass
= v
.get_mclass
(self, "Char")
1584 if mclass
== null then return # Forward error
1585 self.mtype
= mclass
.mclass_type
1589 redef class AugmentedStringFormExpr
1592 # Text::to_re, used for prefix `re`
1593 var to_re
: nullable CallSite = null
1594 # Regex::ignore_case, used for suffix `i` on `re`
1595 var ignore_case
: nullable CallSite = null
1596 # Regex::newline, used for suffix `m` on `re`
1597 var newline
: nullable CallSite = null
1598 # Regex::extended, used for suffix `b` on `re`
1599 var extended
: nullable CallSite = null
1600 # CString::to_bytes_with_copy, used for prefix `b`
1601 var to_bytes_with_copy
: nullable CallSite = null
1603 redef fun accept_typing
(v
) do
1604 var mclass
= v
.get_mclass
(self, "String")
1605 if mclass
== null then return # Forward error
1606 if is_bytestring
then
1607 to_bytes_with_copy
= v
.get_method
(self, v
.mmodule
.c_string_type
, "to_bytes_with_copy", false)
1608 mclass
= v
.get_mclass
(self, "Bytes")
1610 to_re
= v
.get_method
(self, mclass
.mclass_type
, "to_re", false)
1611 for i
in suffix
.chars
do
1612 mclass
= v
.get_mclass
(self, "Regex")
1613 if mclass
== null then
1614 v
.error
(self, "Error: `Regex` class unknown")
1619 service
= "ignore_case="
1620 ignore_case
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1621 else if i
== 'm' then
1622 service
= "newline="
1623 newline
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1624 else if i
== 'b' then
1625 service
= "extended="
1626 extended
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1628 v
.error
(self, "Type Error: Unrecognized suffix {i} in prefixed Regex")
1633 if mclass
== null then return # Forward error
1634 mtype
= mclass
.mclass_type
1638 redef class ASuperstringExpr
1639 redef fun accept_typing
(v
)
1642 var objclass
= v
.get_mclass
(self, "Object")
1643 if objclass
== null then return # Forward error
1644 var objtype
= objclass
.mclass_type
1645 for nexpr
in self.n_exprs
do
1646 v
.visit_expr_subtype
(nexpr
, objtype
)
1651 redef class AArrayExpr
1652 # The `with_capacity` method on Array
1653 var with_capacity_callsite
: nullable CallSite
1655 # The `push` method on arrays
1656 var push_callsite
: nullable CallSite
1658 # The element of each type
1659 var element_mtype
: nullable MType
1661 # Set that `self` is a part of comprehension array `na`
1662 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1663 private fun set_comprehension
(n
: nullable AExpr)
1667 else if n
isa AForExpr then
1668 set_comprehension
(n
.n_block
)
1669 else if n
isa AIfExpr then
1670 set_comprehension
(n
.n_then
)
1671 set_comprehension
(n
.n_else
)
1674 n
.comprehension
= self
1677 redef fun accept_typing
(v
)
1679 var mtype
: nullable MType = null
1680 var ntype
= self.n_type
1681 if ntype
!= null then
1682 mtype
= v
.resolve_mtype
(ntype
)
1683 if mtype
== null then return # Skip error
1685 var mtypes
= new Array[nullable MType]
1687 for e
in self.n_exprs
do
1688 var t
= v
.visit_expr
(e
)
1692 set_comprehension
(e
)
1693 if mtype
!= null then
1694 if v
.check_subtype
(e
, t
, mtype
, false) == null then return # Forward error
1695 if t
== mtype
then useless
= true
1700 if mtype
== null then
1701 # Ensure monotony for type adaptation on loops
1702 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1703 mtype
= v
.merge_types
(self, mtypes
)
1705 if mtype
== null or mtype
isa MNullType then
1706 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1710 assert ntype
!= null
1711 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1714 self.element_mtype
= mtype
1716 var mclass
= v
.get_mclass
(self, "Array")
1717 if mclass
== null then return # Forward error
1718 var array_mtype
= mclass
.get_mtype
([mtype
])
1720 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1721 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1723 self.mtype
= array_mtype
1727 redef class ARangeExpr
1728 var init_callsite
: nullable CallSite
1730 redef fun accept_typing
(v
)
1732 var discrete_class
= v
.get_mclass
(self, "Discrete")
1733 if discrete_class
== null then return # Forward error
1734 var discrete_type
= discrete_class
.intro
.bound_mtype
1735 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1736 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1737 if t1
== null or t2
== null then return
1738 var mclass
= v
.get_mclass
(self, "Range")
1739 if mclass
== null then return # Forward error
1741 if v
.is_subtype
(t1
, t2
) then
1742 mtype
= mclass
.get_mtype
([t2
])
1743 else if v
.is_subtype
(t2
, t1
) then
1744 mtype
= mclass
.get_mtype
([t1
])
1746 v
.error
(self, "Type Error: cannot create range: `{t1}` vs `{t2}`.")
1752 # get the constructor
1754 if self isa ACrangeExpr then
1755 callsite
= v
.get_method
(self, mtype
, "init", false)
1756 else if self isa AOrangeExpr then
1757 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1761 init_callsite
= callsite
1765 redef class ANullExpr
1766 redef fun accept_typing
(v
)
1768 self.mtype
= v
.mmodule
.model
.null_type
1772 redef class AIsaExpr
1773 # The static type to cast to.
1774 # (different from the static type of the expression that is `Bool`).
1775 var cast_type
: nullable MType
1776 redef fun accept_typing
(v
)
1778 v
.visit_expr
(n_expr
)
1780 var mtype
= v
.resolve_mtype
(n_type
)
1782 self.cast_type
= mtype
1784 var variable
= self.n_expr
.its_variable
1785 if variable
!= null then
1786 var orig
= self.n_expr
.mtype
1787 #var from = if orig != null then orig.to_s else "invalid"
1788 #var to = if mtype != null then mtype.to_s else "invalid"
1789 #debug("adapt {variable}: {from} -> {to}")
1791 # Do not adapt if there is no information gain (i.e. adapt to a supertype)
1792 if mtype
== null or orig
== null or not v
.is_subtype
(orig
, mtype
) then
1793 self.after_flow_context
.when_true
.set_var
(v
, variable
, mtype
)
1797 self.mtype
= v
.type_bool
(self)
1800 redef fun accept_post_typing
(v
)
1802 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1805 redef fun dump_info
(v
) do
1807 var mtype
= self.cast_type
1808 if mtype
!= null then
1809 res
+= v
.yellow
(".as({mtype})")
1816 redef class AAsCastExpr
1817 redef fun accept_typing
(v
)
1819 v
.visit_expr
(n_expr
)
1821 self.mtype
= v
.resolve_mtype
(n_type
)
1824 redef fun accept_post_typing
(v
)
1826 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1830 redef class AAsNotnullExpr
1831 redef fun accept_typing
(v
)
1833 var mtype
= v
.visit_expr
(self.n_expr
)
1834 if mtype
== null then return # Forward error
1836 if mtype
isa MNullType then
1837 v
.error
(self, "Type Error: `as(not null)` on `null`.")
1841 if v
.can_be_null
(mtype
) then
1842 mtype
= mtype
.as_notnull
1848 redef fun accept_post_typing
(v
)
1850 var mtype
= n_expr
.mtype
1851 if mtype
== null then return
1852 v
.check_can_be_null
(n_expr
, mtype
)
1856 redef class AParExpr
1857 redef fun accept_typing
(v
)
1859 self.mtype
= v
.visit_expr
(self.n_expr
)
1863 redef class AOnceExpr
1864 redef fun accept_typing
(v
)
1866 self.mtype
= v
.visit_expr
(self.n_expr
)
1870 redef class ASelfExpr
1871 redef var its_variable
: nullable Variable
1872 redef fun accept_typing
(v
)
1874 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1875 v
.error
(self, "Error: `self` cannot be used in top-level method.")
1877 var variable
= v
.selfvariable
1878 self.its_variable
= variable
1879 self.mtype
= v
.get_variable
(self, variable
)
1883 redef class AImplicitSelfExpr
1884 # Is the implicit receiver `sys`?
1886 # By default, the implicit receiver is `self`.
1887 # But when there is not method for `self`, `sys` is used as a fall-back.
1888 # Is this case this flag is set to `true`.
1892 ## MESSAGE SENDING AND PROPERTY
1894 redef class ASendExpr
1895 # The property invoked by the send.
1896 var callsite
: nullable CallSite
1898 redef fun bad_expr_message
(child
)
1900 if child
== self.n_expr
then
1901 return "to be the receiver of `{self.property_name}`"
1906 redef fun accept_typing
(v
)
1908 var nrecv
= self.n_expr
1909 var recvtype
= v
.visit_expr
(nrecv
)
1910 var name
= self.property_name
1911 var node
= self.property_node
1913 if recvtype
== null then return # Forward error
1916 var unsafe_type
= v
.anchor_to
(recvtype
)
1917 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1918 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1919 # Special fall-back search in `sys` when noting found in the implicit receiver.
1920 var sysclass
= v
.try_get_mclass
(node
, "Sys")
1921 if sysclass
!= null then
1922 var systype
= sysclass
.mclass_type
1923 mproperty
= v
.try_get_mproperty_by_name2
(node
, systype
, name
)
1924 if mproperty
!= null then
1925 callsite
= v
.get_method
(node
, systype
, name
, false)
1926 if callsite
== null then return # Forward error
1927 # Update information, we are looking at `sys` now, not `self`
1929 nrecv
.its_variable
= null
1930 nrecv
.mtype
= systype
1935 if callsite
== null then
1936 # If still nothing, just exit
1937 callsite
= v
.get_method
(node
, recvtype
, name
, nrecv
isa ASelfExpr)
1938 if callsite
== null then return
1941 self.callsite
= callsite
1942 var msignature
= callsite
.msignature
1944 var args
= compute_raw_arguments
1946 callsite
.check_signature
(v
, node
, args
)
1948 if callsite
.mproperty
.is_init
then
1949 var vmpropdef
= v
.mpropdef
1950 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1951 v
.error
(node
, "Error: an `init` can only be called from another `init`.")
1953 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1954 v
.error
(node
, "Error: `{vmpropdef}` cannot call a factory `{callsite.mproperty}`.")
1958 var ret
= msignature
.return_mtype
1962 self.is_typed
= true
1966 # The name of the property
1967 # Each subclass simply provide the correct name.
1968 private fun property_name
: String is abstract
1970 # The node identifying the name (id, operator, etc) for messages.
1972 # Is `self` by default
1973 private fun property_node
: ANode do return self
1975 # An array of all arguments (excluding self)
1976 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1978 private fun compute_raw_arguments
: Array[AExpr] is abstract
1980 redef fun dump_info
(v
) do
1982 var callsite
= self.callsite
1983 if callsite
!= null then
1984 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
1990 redef class ABinopExpr
1991 redef fun compute_raw_arguments
do return [n_expr2
]
1992 redef fun property_name
do return operator
1993 redef fun property_node
do return n_op
1996 redef class AEqFormExpr
1997 redef fun accept_typing
(v
)
2003 redef fun accept_post_typing
(v
)
2005 var mtype
= n_expr
.mtype
2006 var mtype2
= n_expr2
.mtype
2008 if mtype
== null or mtype2
== null then return
2010 if not mtype2
isa MNullType then return
2012 v
.check_can_be_null
(n_expr
, mtype
)
2016 redef class AUnaryopExpr
2017 redef fun property_name
do return "unary {operator}"
2018 redef fun compute_raw_arguments
do return new Array[AExpr]
2022 redef class ACallExpr
2023 redef fun property_name
do return n_qid
.n_id
.text
2024 redef fun property_node
do return n_qid
2025 redef fun compute_raw_arguments
do return n_args
.to_a
2028 redef class ACallAssignExpr
2029 redef fun property_name
do return n_qid
.n_id
.text
+ "="
2030 redef fun property_node
do return n_qid
2031 redef fun compute_raw_arguments
2033 var res
= n_args
.to_a
2039 redef class ABraExpr
2040 redef fun property_name
do return "[]"
2041 redef fun compute_raw_arguments
do return n_args
.to_a
2044 redef class ABraAssignExpr
2045 redef fun property_name
do return "[]="
2046 redef fun compute_raw_arguments
2048 var res
= n_args
.to_a
2054 redef class ASendReassignFormExpr
2055 # The property invoked for the writing
2056 var write_callsite
: nullable CallSite
2058 redef fun accept_typing
(v
)
2060 var recvtype
= v
.visit_expr
(self.n_expr
)
2061 var name
= self.property_name
2062 var node
= self.property_node
2064 if recvtype
== null then return # Forward error
2066 var for_self
= self.n_expr
isa ASelfExpr
2067 var callsite
= v
.get_method
(node
, recvtype
, name
, for_self
)
2069 if callsite
== null then return
2070 self.callsite
= callsite
2072 var args
= compute_raw_arguments
2074 callsite
.check_signature
(v
, node
, args
)
2076 var readtype
= callsite
.msignature
.return_mtype
2077 if readtype
== null then
2078 v
.error
(node
, "Error: `{name}` is not a function.")
2082 var wcallsite
= v
.get_method
(node
, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
2083 if wcallsite
== null then return
2084 self.write_callsite
= wcallsite
2086 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
2087 if wtype
== null then return
2089 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
2090 args
.add
(self.n_value
)
2091 wcallsite
.check_signature
(v
, node
, args
)
2093 self.is_typed
= true
2097 redef class ACallReassignExpr
2098 redef fun property_name
do return n_qid
.n_id
.text
2099 redef fun property_node
do return n_qid
.n_id
2100 redef fun compute_raw_arguments
do return n_args
.to_a
2103 redef class ABraReassignExpr
2104 redef fun property_name
do return "[]"
2105 redef fun compute_raw_arguments
do return n_args
.to_a
2108 redef class AInitExpr
2109 redef fun property_name
do return "init"
2110 redef fun property_node
do return n_kwinit
2111 redef fun compute_raw_arguments
do return n_args
.to_a
2115 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
2120 redef class ASuperExpr
2121 # The method to call if the super is in fact a 'super init call'
2122 # Note: if the super is a normal call-next-method, then this attribute is null
2123 var callsite
: nullable CallSite
2125 # The method to call is the super is a standard `call-next-method` super-call
2126 # Note: if the super is a special super-init-call, then this attribute is null
2127 var mpropdef
: nullable MMethodDef
2129 redef fun accept_typing
(v
)
2131 var anchor
= v
.anchor
2132 assert anchor
!= null
2133 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2134 assert recvtype
!= null
2135 var mproperty
= v
.mpropdef
.mproperty
2136 if not mproperty
isa MMethod then
2137 v
.error
(self, "Error: `super` only usable in a `method`.")
2140 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
2141 if superprops
.length
== 0 then
2142 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
2143 process_superinit
(v
)
2146 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2149 # FIXME: covariance of return type in linear extension?
2150 var superprop
= superprops
.first
2152 var msignature
= superprop
.msignature
.as(not null)
2153 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2154 var args
= self.n_args
.to_a
2155 if args
.length
> 0 then
2156 signaturemap
= v
.check_signature
(self, args
, mproperty
, msignature
)
2158 self.mtype
= msignature
.return_mtype
2159 self.is_typed
= true
2160 v
.mpropdef
.has_supercall
= true
2161 mpropdef
= v
.mpropdef
.as(MMethodDef)
2164 # The mapping used on the call to associate arguments to parameters.
2165 # If null then no specific association is required.
2166 var signaturemap
: nullable SignatureMap
2168 private fun process_superinit
(v
: TypeVisitor)
2170 var anchor
= v
.anchor
2171 assert anchor
!= null
2172 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2173 assert recvtype
!= null
2174 var mpropdef
= v
.mpropdef
2175 assert mpropdef
isa MMethodDef
2176 var mproperty
= mpropdef
.mproperty
2177 var superprop
: nullable MMethodDef = null
2178 for msupertype
in mpropdef
.mclassdef
.supertypes
do
2179 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
2180 var errcount
= v
.modelbuilder
.toolcontext
.error_count
2181 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
2182 if candidate
== null then
2183 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
2184 continue # Try next super-class
2186 if superprop
!= null and candidate
.is_root_init
then
2189 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
2190 v
.error
(self, "Error: conflicting super constructor to call for `{mproperty}`: `{candidate.full_name}`, `{superprop.mproperty.full_name}`")
2193 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
2194 if superprop
!= null and superprop
.mproperty
== candidate
then
2195 if superprop
== candidatedefs
.first
then continue
2196 candidatedefs
.add
(superprop
)
2198 if candidatedefs
.length
> 1 then
2199 v
.error
(self, "Error: conflicting property definitions for property `{mproperty}` in `{recvtype}`: {candidatedefs.join(", ")}")
2202 superprop
= candidatedefs
.first
2204 if superprop
== null then
2205 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2209 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
2210 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2212 var callsite
= new CallSite(hot_location
, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
2213 self.callsite
= callsite
2215 var args
= self.n_args
.to_a
2216 if args
.length
> 0 then
2217 callsite
.check_signature
(v
, self, args
)
2219 # Check there is at least enough parameters
2220 if mpropdef
.msignature
.arity
< msignature
.arity
then
2221 v
.error
(self, "Error: not enough implicit arguments to pass. Got `{mpropdef.msignature.arity}`, expected at least `{msignature.arity}`. Signature is `{msignature}`.")
2224 # Check that each needed parameter is conform
2226 for sp
in msignature
.mparameters
do
2227 var p
= mpropdef
.msignature
.mparameters
[i
]
2228 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
2229 v
.error
(self, "Type Error: expected argument #{i} of type `{sp.mtype}`, got implicit argument `{p.name}` of type `{p.mtype}`. Signature is {msignature}")
2236 self.is_typed
= true
2239 redef fun dump_info
(v
) do
2241 var callsite
= self.callsite
2242 if callsite
!= null then
2243 res
+= v
.yellow
(" super-init="+callsite
.dump_info
(v
))
2245 var mpropdef
= self.mpropdef
2246 if mpropdef
!= null then
2247 res
+= v
.yellow
(" call-next-method="+mpropdef
.to_s
)
2255 redef class ANewExpr
2256 # The constructor invoked by the new.
2257 var callsite
: nullable CallSite
2259 # The designated type
2260 var recvtype
: nullable MClassType
2262 redef fun accept_typing
(v
)
2264 var recvtype
= v
.resolve_mtype
(self.n_type
)
2265 if recvtype
== null then return
2267 if not recvtype
isa MClassType then
2268 if recvtype
isa MNullableType then
2269 v
.error
(self, "Type Error: cannot instantiate the nullable type `{recvtype}`.")
2271 else if recvtype
isa MFormalType then
2272 v
.error
(self, "Type Error: cannot instantiate the formal type `{recvtype}`.")
2275 v
.error
(self, "Type Error: cannot instantiate the type `{recvtype}`.")
2280 self.recvtype
= recvtype
2281 var kind
= recvtype
.mclass
.kind
2284 var nqid
= self.n_qid
2286 if nqid
!= null then
2287 name
= nqid
.n_id
.text
2293 if name
== "intern" then
2294 if kind
!= concrete_kind
then
2295 v
.error
(self, "Type Error: cannot instantiate {kind} {recvtype}.")
2298 if n_args
.n_exprs
.not_empty
then
2299 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
2303 self.mtype
= recvtype
2307 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
2308 if callsite
== null then return
2310 if not callsite
.mproperty
.is_new
then
2311 if kind
!= concrete_kind
then
2312 v
.error
(self, "Type Error: cannot instantiate {kind} `{recvtype}`.")
2315 self.mtype
= recvtype
2317 self.mtype
= callsite
.msignature
.return_mtype
2318 assert self.mtype
!= null
2321 self.callsite
= callsite
2323 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
2324 v
.error
(self, "Error: `{name}` is not a constructor.")
2328 var args
= n_args
.to_a
2329 callsite
.check_signature
(v
, node
, args
)
2332 redef fun dump_info
(v
) do
2334 var callsite
= self.callsite
2335 if callsite
!= null then
2336 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
2344 redef class AAttrFormExpr
2345 # The attribute accessed.
2346 var mproperty
: nullable MAttribute
2348 # The static type of the attribute.
2349 var attr_type
: nullable MType
2351 # Resolve the attribute accessed.
2352 private fun resolve_property
(v
: TypeVisitor)
2354 var recvtype
= v
.visit_expr
(self.n_expr
)
2355 if recvtype
== null then return # Skip error
2356 var node
= self.n_id
2357 var name
= node
.text
2358 if recvtype
isa MNullType then
2359 v
.error
(node
, "Error: attribute `{name}` access on `null`.")
2363 var unsafe_type
= v
.anchor_to
(recvtype
)
2364 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
2365 if mproperty
== null then
2366 v
.modelbuilder
.error
(node
, "Error: attribute `{name}` does not exist in `{recvtype}`.")
2369 assert mproperty
isa MAttribute
2370 self.mproperty
= mproperty
2372 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
2373 assert mpropdefs
.length
== 1
2374 var mpropdef
= mpropdefs
.first
2375 var attr_type
= mpropdef
.static_mtype
2376 if attr_type
== null then return # skip error
2377 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
2378 self.attr_type
= attr_type
2381 redef fun dump_info
(v
) do
2383 var mproperty
= self.mproperty
2384 var attr_type
= self.attr_type
2385 if mproperty
!= null then
2386 res
+= v
.yellow
(" attr={mproperty}:{attr_type or else "BROKEN"}")
2392 redef class AAttrExpr
2393 redef fun accept_typing
(v
)
2395 self.resolve_property
(v
)
2396 self.mtype
= self.attr_type
2401 redef class AAttrAssignExpr
2402 redef fun accept_typing
(v
)
2404 self.resolve_property
(v
)
2405 var mtype
= self.attr_type
2407 v
.visit_expr_subtype
(self.n_value
, mtype
)
2408 self.is_typed
= mtype
!= null
2412 redef class AAttrReassignExpr
2413 redef fun accept_typing
(v
)
2415 self.resolve_property
(v
)
2416 var mtype
= self.attr_type
2417 if mtype
== null then return # Skip error
2419 var rettype
= self.resolve_reassignment
(v
, mtype
, mtype
)
2421 self.is_typed
= rettype
!= null
2425 redef class AIssetAttrExpr
2426 redef fun accept_typing
(v
)
2428 self.resolve_property
(v
)
2429 var mtype
= self.attr_type
2430 if mtype
== null then return # Skip error
2432 var recvtype
= self.n_expr
.mtype
.as(not null)
2433 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2434 if bound
isa MNullableType then
2435 v
.error
(n_id
, "Type Error: `isset` on a nullable attribute.")
2437 self.mtype
= v
.type_bool
(self)
2441 redef class AVarargExpr
2442 redef fun accept_typing
(v
)
2444 # This kind of pseudo-expression can be only processed trough a signature
2445 # See `check_signature`
2446 # Other cases are a syntax error.
2447 v
.error
(self, "Syntax Error: unexpected `...`.")
2453 redef class ADebugTypeExpr
2454 redef fun accept_typing
(v
)
2456 var expr
= v
.visit_expr
(self.n_expr
)
2457 if expr
== null then return
2458 var unsafe
= v
.anchor_to
(expr
)
2459 var ntype
= self.n_type
2460 var mtype
= v
.resolve_mtype
(ntype
)
2461 if mtype
!= null and mtype
!= expr
then
2462 var umtype
= v
.anchor_to
(mtype
)
2463 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2465 self.is_typed
= true