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
39 var mmodule
: MModule is noinit
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 mmodule
= mclassdef
.mmodule
64 self.mclassdef
= mclassdef
65 self.anchor
= mclassdef
.bound_mtype
67 var mclass
= mclassdef
.mclass
69 var selfvariable
= new Variable("self")
70 self.selfvariable
= selfvariable
71 selfvariable
.declared_type
= mclass
.mclass_type
73 var mprop
= mpropdef
.mproperty
74 if mprop
isa MMethod and mprop
.is_new
then
75 is_toplevel_context
= true
79 fun anchor_to
(mtype
: MType): MType
81 return mtype
.anchor_to
(mmodule
, anchor
)
84 fun is_subtype
(sub
, sup
: MType): Bool
86 return sub
.is_subtype
(mmodule
, anchor
, sup
)
89 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
91 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
92 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
96 # Check that `sub` is a subtype of `sup`.
97 # If `sub` is not a valid suptype, then display an error on `node` and return `null`.
98 # If `sub` is a safe subtype of `sup`, then return `sub`.
99 # If `sub` is an unsafe subtype (i.e., an implicit cast is required), then return `sup`.
101 # The point of the return type is to determinate the usable type on an expression when `autocast` is true:
102 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
103 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
104 fun check_subtype
(node
: ANode, sub
, sup
: MType, autocast
: Bool): nullable MType
106 if self.is_subtype
(sub
, sup
) then return sub
107 if autocast
and self.is_subtype
(sub
, self.anchor_to
(sup
)) then
108 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
109 #node.debug("Unsafe typing: expected {sup}, got {sub}")
112 if sup
isa MErrorType then return null # Skip error
113 if sub
.need_anchor
then
114 var u
= anchor_to
(sub
)
115 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}: {u}`.")
117 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}`.")
122 # Visit an expression and do not care about the return value
123 fun visit_stmt
(nexpr
: nullable AExpr)
125 if nexpr
== null then return
126 nexpr
.accept_typing
(self)
129 # Visit an expression and expects that it is not a statement
130 # Return the type of the expression
131 # Display an error and return null if:
132 # * the type cannot be determined or
133 # * `nexpr` is a statement
134 fun visit_expr
(nexpr
: AExpr): nullable MType
136 nexpr
.accept_typing
(self)
137 var mtype
= nexpr
.mtype
138 if mtype
!= null then return mtype
139 if not nexpr
.is_typed
then
140 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
141 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
142 nexpr
.debug
("No return type but no error.")
145 return null # forward error
147 var more_message
= null
149 if p
!= null then more_message
= p
.bad_expr_message
(nexpr
)
150 if more_message
== null then more_message
= "" else more_message
= " " + more_message
151 self.error
(nexpr
, "Error: expected an expression{more_message}.")
155 # Visit an expression and expect its static type is a least a `sup`
156 # Return the type of the expression or null if
157 # * the type cannot be determined or
158 # * `nexpr` is a statement or
159 # * `nexpr` is not a `sup`
160 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
162 var sub
= visit_expr
(nexpr
)
163 if sub
== null then return null # Forward error
165 if sup
== null then return null # Forward error
167 var res
= check_subtype
(nexpr
, sub
, sup
, true)
169 nexpr
.implicit_cast_to
= res
174 # Visit an expression and expect its static type is a `Bool`
175 # Return the type of the expression or null if
176 # * the type cannot be determined or
177 # * `nexpr` is a statement or
178 # * `nexpr` is not a `Bool`
179 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
181 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
185 fun check_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
187 var sub
= nexpr
.mtype
188 if sub
== null then return null # Forward error
190 var sup
= ntype
.mtype
191 if sup
== null then return null # Forward error
194 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}`.")
195 else if self.is_subtype
(sub
, sup
) then
196 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}` since it is a `{sub}`.")
201 # Can `mtype` be null (up to the current knowledge)?
202 fun can_be_null
(mtype
: MType): Bool
204 if mtype
isa MNullableType or mtype
isa MNullType then return true
205 if mtype
isa MFormalType then
206 var x
= anchor_to
(mtype
)
207 if x
isa MNullableType or x
isa MNullType then return true
212 # Check that `mtype` can be null (up to the current knowledge).
214 # If not then display a `useless-null-test` warning on node and return false.
216 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
218 if mtype
isa MNullType then
219 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is always `null`.")
222 if can_be_null
(mtype
) then return true
224 if mtype
isa MFormalType then
225 var res
= anchor_to
(mtype
)
226 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
228 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
233 # Special verification on != and == for null
235 fun null_test
(anode
: ABinopExpr)
237 var mtype
= anode
.n_expr
.mtype
238 var mtype2
= anode
.n_expr2
.mtype
240 if mtype
== null or mtype2
== null then return
242 if not mtype2
isa MNullType then return
244 # Check of useless null
245 if not can_be_null
(mtype
) then return
247 if mtype
isa MNullType then
248 # Because of type adaptation, we cannot just stop here
249 # so return use `null` as a bottom type that will be merged easily (cf) `merge_types`
252 mtype
= mtype
.as_notnull
255 # Check for type adaptation
256 var variable
= anode
.n_expr
.its_variable
257 if variable
== null then return
259 # One is null (mtype2 see above) the other is not null
260 if anode
isa AEqExpr then
261 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype2
)
262 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype
)
263 else if anode
isa ANeExpr then
264 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype2
)
265 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype
)
271 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
273 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
276 fun resolve_mtype
(node
: AType): nullable MType
278 return self.modelbuilder
.resolve_mtype
(mclassdef
, node
)
281 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
283 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
287 fun get_mclass
(node
: ANode, name
: String): nullable MClass
289 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
293 fun type_bool
(node
: ANode): nullable MType
295 var mclass
= self.get_mclass
(node
, "Bool")
296 if mclass
== null then return null
297 return mclass
.mclass_type
300 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
302 var unsafe_type
= self.anchor_to
(recvtype
)
304 #debug("recv: {recvtype} (aka {unsafe_type})")
305 if recvtype
isa MNullType then
306 var objclass
= get_mclass
(node
, "Object")
307 if objclass
== null then return null # Forward error
308 unsafe_type
= objclass
.mclass_type
311 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
312 if name
== "new" and mproperty
== null then
314 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
317 if mproperty
== null then
319 self.modelbuilder
.error
(node
, "Error: method or variable `{name}` unknown in `{recvtype}`.")
320 else if recvtype
.need_anchor
then
321 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}: {unsafe_type}`.")
323 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}`.")
328 assert mproperty
isa MMethod
330 # `null` only accepts some methods of object.
331 if recvtype
isa MNullType and not mproperty
.is_null_safe
then
332 self.error
(node
, "Error: method `{name}` called on `null`.")
334 else if unsafe_type
isa MNullableType and not mproperty
.is_null_safe
then
335 modelbuilder
.advice
(node
, "call-on-nullable", "Warning: method call on a nullable receiver `{recvtype}`.")
338 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
339 error
(node
, "Error: `{name}` is not a top-level method, thus need a receiver.")
341 if not recv_is_self
and mproperty
.is_toplevel
then
342 error
(node
, "Error: cannot call `{name}`, a top-level method, with a receiver.")
345 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
346 self.modelbuilder
.error
(node
, "Error: method `{name}` is protected and can only accessed by `self`.")
350 var info
= mproperty
.deprecation
351 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
354 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated: {mdoc.content.first}")
356 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated.")
360 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
362 if propdefs
.length
== 0 then
363 self.modelbuilder
.error
(node
, "Type Error: no definition found for property `{name}` in `{unsafe_type}`.")
365 else if propdefs
.length
== 1 then
366 mpropdef
= propdefs
.first
368 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property `{name}` in `{unsafe_type}`: {propdefs.join(" ")}")
369 mpropdef
= mproperty
.intro
373 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
374 if msignature
== null then return null # skip error
375 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
377 var erasure_cast
= false
378 var rettype
= mpropdef
.msignature
.return_mtype
379 if not recv_is_self
and rettype
!= null then
380 rettype
= rettype
.undecorate
381 if rettype
isa MParameterType then
382 var erased_rettype
= msignature
.return_mtype
383 assert erased_rettype
!= null
384 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
389 var callsite
= new CallSite(node
.hot_location
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
393 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
395 var unsafe_type
= self.anchor_to
(recvtype
)
396 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
397 if mproperty
== null then return null
398 return get_method
(node
, recvtype
, name
, recv_is_self
)
402 # Visit the expressions of args and check their conformity with the corresponding type in signature
403 # The point of this method is to handle varargs correctly
404 # Note: The signature must be correctly adapted
405 fun check_signature
(node
: ANode, args
: Array[AExpr], mproperty
: MProperty, msignature
: MSignature): nullable SignatureMap
407 var vararg_rank
= msignature
.vararg_rank
408 if vararg_rank
>= 0 then
409 if args
.length
< msignature
.arity
then
410 modelbuilder
.error
(node
, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
413 else if args
.length
!= msignature
.arity
then
415 if args
.length
> msignature
.arity
then
416 modelbuilder
.error
(node
, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
419 # Other cases are managed later
423 #debug("CALL {unsafe_type}.{msignature}")
425 # Associate each parameter to a position in the arguments
426 var map
= new SignatureMap
428 # Special case for the isolated last argument
429 # TODO: reify this method characteristics (where? the param, the signature, the method?)
430 var last_is_padded
= mproperty
.name
.chars
.last
== '='
431 var nbargs
= args
.length
432 if last_is_padded
then
434 assert not args
.last
isa ANamedargExpr
435 map
.map
[msignature
.arity
- 1] = args
.length
- 1
436 self.visit_expr_subtype
(args
.last
, msignature
.mparameters
.last
.mtype
)
439 # First, handle named arguments
440 for i
in [0..args
.length
[ do
442 if not e
isa ANamedargExpr then continue
443 var name
= e
.n_id
.text
444 var param
= msignature
.mparameter_by_name
(name
)
445 if param
== null then
446 modelbuilder
.error
(e
.n_id
, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
449 var idx
= msignature
.mparameters
.index_of
(param
)
450 var prev
= map
.map
.get_or_null
(idx
)
452 modelbuilder
.error
(e
, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
456 e
.mtype
= self.visit_expr_subtype
(e
.n_expr
, param
.mtype
)
459 # Number of minimum mandatory remaining parameters
462 # Second, associate remaining parameters
463 var vararg_decl
= args
.length
- msignature
.arity
465 for i
in [0..msignature
.arity
[ do
466 # Skip parameters associated by name
467 if map
.map
.has_key
(i
) then continue
469 var param
= msignature
.mparameters
[i
]
471 # Search the next free argument: skip named arguments since they are already associated
472 while j
< nbargs
and args
[j
] isa ANamedargExpr do j
+= 1
474 if not param
.mtype
isa MNullableType then
484 if i
== vararg_rank
then
486 continue # skip the vararg
489 if not param
.is_vararg
then
490 var paramtype
= param
.mtype
491 self.visit_expr_subtype
(arg
, paramtype
)
493 check_one_vararg
(arg
, param
)
497 if min_arity
> 0 then
498 if last_is_padded
then min_arity
+= 1
499 if min_arity
< msignature
.arity
then
500 modelbuilder
.error
(node
, "Error: expected at least {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
502 modelbuilder
.error
(node
, "Error: expected {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
507 # Third, check varargs
508 if vararg_rank
>= 0 then
509 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
510 var first
= args
[vararg_rank
]
511 if vararg_decl
== 0 then
512 if not check_one_vararg
(first
, msignature
.mparameters
[vararg_rank
]) then return null
514 first
.vararg_decl
= vararg_decl
+ 1
515 for i
in [vararg_rank
..vararg_rank
+vararg_decl
] do
516 self.visit_expr_subtype
(args
[i
], paramtype
)
524 # Check an expression as a single vararg.
525 # The main point of the method if to handle the case of reversed vararg (see `AVarargExpr`)
526 fun check_one_vararg
(arg
: AExpr, param
: MParameter): Bool
528 var paramtype
= param
.mtype
529 var mclass
= get_mclass
(arg
, "Array")
530 if mclass
== null then return false # Forward error
531 var array_mtype
= mclass
.get_mtype
([paramtype
])
532 if arg
isa AVarargExpr then
533 self.visit_expr_subtype
(arg
.n_expr
, array_mtype
)
534 arg
.mtype
= arg
.n_expr
.mtype
536 # only one vararg, maybe `...` was forgot, so be gentle!
537 var t
= visit_expr
(arg
)
538 if t
== null then return false # Forward error
539 if not is_subtype
(t
, paramtype
) and is_subtype
(t
, array_mtype
) then
540 # Not acceptable but could be a `...`
541 error
(arg
, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
544 # Standard valid vararg, finish the job
546 self.visit_expr_subtype
(arg
, paramtype
)
551 fun error
(node
: ANode, message
: String)
553 self.modelbuilder
.error
(node
, message
)
556 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
558 if not variable
.is_adapted
then return variable
.declared_type
560 var flow
= node
.after_flow_context
561 if flow
== null then return null # skip error
563 if flow
.vars
.has_key
(variable
) then
564 return flow
.vars
[variable
]
566 #node.debug("*** START Collected for {variable}")
567 var mtypes
= flow
.collect_types
(variable
)
568 #node.debug("**** END Collected for {variable}")
569 if mtypes
.length
== 0 then
570 return variable
.declared_type
571 else if mtypes
.length
== 1 then
574 var res
= merge_types
(node
,mtypes
)
576 res
= variable
.declared_type
577 # Try to fallback to a non-null version
578 if res
!= null and can_be_null
(res
) then do
580 if t
!= null and can_be_null
(t
) then break label
590 # Some variables where type-adapted during the visit
593 # Some loops had been visited during the visit
596 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
598 var flow
= node
.after_flow_context
601 flow
.set_var
(self, variable
, mtype
)
604 # Find the exact representable most specific common super-type in `col`.
606 # Try to find the most specific common type that is a super-type of each types
608 # In most cases, the result is simply the most general type in `col`.
609 # If nullables types are involved, then the nullable information is correctly preserved.
610 # If incomparable super-types exists in `col`, them no solution is given and the `null`
611 # value is returned (since union types are non representable in Nit)
613 # The `null` values in `col` are ignored, nulltypes (MNullType) are considered.
615 # Returns the `null` value if:
618 # * `col` only have null values
619 # * there is a conflict
621 # Example (with a diamond A,B,C,D):
623 # * merge(A,B,C) -> A, because A is the most general type in {A,B,C}
624 # * merge(C,B) -> null, there is conflict, because `B or C` cannot be represented
625 # * merge(A,nullable B) -> nullable A, because A is the most general type and
626 # the nullable information is preserved
627 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
629 if col
.length
== 1 then return col
.first
631 if t1
== null then continue # return null
634 if t2
== null then continue # return null
635 if can_be_null
(t2
) and not can_be_null
(t1
) then
638 if not is_subtype
(t2
, t1
) then found
= false
641 #print "merge {col.join(" ")} -> {t1}"
645 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
649 # Find a most general common subtype between `type1` and `type2`.
651 # Find the most general type that is a subtype of `type2` and, if possible, a subtype of `type1`.
652 # Basically, this return the most specific type between `type1` and `type2`.
653 # If nullable types are involved, the information is correctly preserved.
654 # If `type1` and `type2` are incomparable then `type2` is preferred (since intersection types
655 # are not representable in Nit).
657 # The `null` value is returned if both `type1` and `type2` are null.
659 # Examples (with diamond A,B,C,D):
661 # * intersect_types(A,B) -> B, because B is a subtype of A
662 # * intersect_types(B,A) -> B, because B is a subtype of A
663 # * intersect_types(B,C) -> C, B and C are incomparable,
664 # `type2` is then preferred (`B and C` cannot be represented)
665 # * intersect_types(nullable B,A) -> B, because B<:A and the non-null information is preserved
666 # * intersect_types(B,nullable C) -> C, `type2` is preferred and the non-null information is preserved
667 fun intersect_types
(node
: ANode, type1
, type2
: nullable MType): nullable MType
669 if type1
== null then return type2
670 if type2
== null then return type1
672 if not can_be_null
(type2
) or not can_be_null
(type1
) then
673 type1
= type1
.as_notnull
674 type2
= type2
.as_notnull
678 if is_subtype
(type1
, type2
) then
686 # Find a most general type that is a subtype of `type1` but not one of `type2`.
688 # Basically, this returns `type1`-`type2` but since there is no substraction type
689 # in Nit this just returns `type1` most of the case.
691 # The few other cases are if `type2` is a super-type and if some nullable information
694 # The `null` value is returned if `type1` is null.
696 # Examples (with diamond A,B,C,D):
698 # * diff_types(A,B) -> A, because the notB cannot be represented
699 # * diff_types(B,A) -> None (absurd type), because B<:A
700 # * diff_types(nullable A, nullable B) -> A, because null is removed
701 # * diff_types(nullable B, A) -> Null, because anything but null is removed
702 fun diff_types
(node
: ANode, type1
, type2
: nullable MType): nullable MType
704 if type1
== null then return null
705 if type2
== null then return type1
707 # if t1 <: t2 then t1-t2 = bottom
708 if is_subtype
(type1
, type2
) then
709 return modelbuilder
.model
.null_type
.as_notnull
712 # else if t1 <: nullable t2 then t1-t2 = nulltype
713 if is_subtype
(type1
, type2
.as_nullable
) then
714 return modelbuilder
.model
.null_type
717 # else t2 can be null and type2 must accept null then null is excluded in t1
718 if can_be_null
(type1
) and (type2
isa MNullableType or type2
isa MNullType) then
719 return type1
.as_notnull
726 # Mapping between parameters and arguments in a call.
728 # Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
730 # The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
732 # Associate a parameter to an argument
733 var map
= new ArrayMap[Int, Int]
736 # A specific method call site with its associated informations.
742 # The static type of the receiver (possibly unresolved)
745 # The module where the callsite is present
748 # The anchor to use with `recv` or `msignature`
749 var anchor
: nullable MClassType
751 # Is the receiver self?
752 # If "for_self", virtual types of the signature are kept
753 # If "not_for_self", virtual type are erased
754 var recv_is_self
: Bool
756 # The designated method
757 var mproperty
: MMethod
759 # The statically designated method definition
760 # The most specif one, it is.
761 var mpropdef
: MMethodDef
763 # The resolved signature for the receiver
764 var msignature
: MSignature
766 # Is a implicit cast required on erasure typing policy?
767 var erasure_cast
: Bool
769 # The mapping used on the call to associate arguments to parameters
770 # If null then no specific association is required.
771 var signaturemap
: nullable SignatureMap = null
773 private fun check_signature
(v
: TypeVisitor, node
: ANode, args
: Array[AExpr]): Bool
775 var map
= v
.check_signature
(node
, args
, self.mproperty
, self.msignature
)
777 if map
== null then is_broken
= true
781 # Information about the callsite to display on a node
782 fun dump_info
(v
: ASTDump): String do
783 return "{recv}.{mpropdef}{msignature}"
786 redef fun mdoc_or_fallback
do return mproperty
.intro
.mdoc
790 # The declared type of the variable
791 var declared_type
: nullable MType = null is writable
793 # Was the variable type-adapted?
794 # This is used to speedup type retrieval while it remains `false`
795 private var is_adapted
= false
798 redef class FlowContext
799 # Store changes of types because of type evolution
800 private var vars
= new HashMap[Variable, nullable MType]
802 # Adapt the variable to a static type
803 # Warning1: do not modify vars directly.
804 # Warning2: sub-flow may have cached a unadapted variable
805 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
807 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
808 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
809 self.vars
[variable
] = mtype
811 variable
.is_adapted
= true
812 #node.debug "set {variable} to {mtype or else "X"}"
815 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
816 private fun collect_types
(variable
: Variable): Array[nullable MType]
818 #node.debug "flow for {variable}"
819 var res
= new Array[nullable MType]
822 var seen
= new HashSet[FlowContext]
823 while not todo
.is_empty
do
825 if f
.is_unreachable
then continue
826 if seen
.has
(f
) then continue
829 if f
.vars
.has_key
(variable
) then
830 # Found something. Collect it and do not process further on this path
831 res
.add f
.vars
[variable
]
832 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
834 todo
.add_all f
.previous
836 if f
.previous
.is_empty
then
837 # Root flowcontext mean a parameter or something related
838 res
.add variable
.declared_type
839 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
843 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
849 # The entry point of the whole typing analysis
850 fun do_typing
(modelbuilder
: ModelBuilder)
854 # The variable associated to the receiver (if any)
855 var selfvariable
: nullable Variable
858 redef class AMethPropdef
859 redef fun do_typing
(modelbuilder
: ModelBuilder)
861 var mpropdef
= self.mpropdef
862 if mpropdef
== null then return # skip error
864 var v
= new TypeVisitor(modelbuilder
, mpropdef
)
865 self.selfvariable
= v
.selfvariable
867 var mmethoddef
= self.mpropdef
.as(not null)
868 var msignature
= mmethoddef
.msignature
869 if msignature
== null then return # skip error
870 for i
in [0..msignature
.arity
[ do
871 var mtype
= msignature
.mparameters
[i
].mtype
872 if msignature
.vararg_rank
== i
then
873 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
874 if arrayclass
== null then return # Skip error
875 mtype
= arrayclass
.get_mtype
([mtype
])
877 var variable
= self.n_signature
.n_params
[i
].variable
878 assert variable
!= null
879 variable
.declared_type
= mtype
882 var nblock
= self.n_block
883 if nblock
== null then return
888 if not v
.has_loop
or not v
.dirty
then break
891 var post_visitor
= new PostTypingVisitor(v
)
892 post_visitor
.enter_visit
(self)
894 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
895 # We reach the end of the function without having a return, it is bad
896 v
.error
(self, "Error: reached end of function; expected `return` with a value.")
901 private class PostTypingVisitor
903 var type_visitor
: TypeVisitor
904 redef fun visit
(n
) do
906 n
.accept_post_typing
(type_visitor
)
907 if n
isa AExpr and n
.mtype
== null and not n
.is_typed
then
914 private fun accept_post_typing
(v
: TypeVisitor) do end
916 # An additional information message to explain the role of a child expression.
918 # The point of the method is to allow some kind of double dispatch so the parent
919 # choose how to describe its children.
920 private fun bad_expr_message
(child
: AExpr): nullable String do return null
923 redef class AAttrPropdef
924 redef fun do_typing
(modelbuilder
: ModelBuilder)
926 if not has_value
then return
928 var mpropdef
= self.mreadpropdef
929 if mpropdef
== null or mpropdef
.msignature
== null then return # skip error
931 var v
= new TypeVisitor(modelbuilder
, mpropdef
)
932 self.selfvariable
= v
.selfvariable
934 var nexpr
= self.n_expr
935 if nexpr
!= null then
936 var mtype
= self.mtype
937 v
.visit_expr_subtype
(nexpr
, mtype
)
939 var nblock
= self.n_block
940 if nblock
!= null then
942 if not nblock
.after_flow_context
.is_unreachable
then
943 # We reach the end of the init without having a return, it is bad
944 v
.error
(self, "Error: reached end of block; expected `return`.")
953 # The static type of the expression.
954 # null if self is a statement or in case of error
955 var mtype
: nullable MType = null
957 # Is the statement correctly typed?
958 # Used to distinguish errors and statements when `mtype == null`
959 var is_typed
: Bool = false
961 # If required, the following implicit cast `.as(XXX)`
962 # Such a cast may by required after evaluating the expression when
963 # a unsafe operation is detected (silently accepted by the Nit language).
964 # The attribute is computed by `check_subtype`
965 var implicit_cast_to
: nullable MType = null
967 # Return the variable read (if any)
968 # Used to perform adaptive typing
969 fun its_variable
: nullable Variable do return null
971 private fun accept_typing
(v
: TypeVisitor)
973 v
.error
(self, "no implemented accept_typing for {self.class_name}")
976 # Is non-null if `self` is a leaf of a comprehension array construction.
977 # In this case, the enclosing literal array node is designated.
978 # The result of the evaluation of `self` must be
979 # stored inside the designated array (there is an implicit `push`)
980 var comprehension
: nullable AArrayExpr = null
982 # It indicates the number of arguments collected as a vararg.
984 # When 0, the argument is used as is, without transformation.
985 # When 1, the argument is transformed into an singleton array.
986 # Above 1, the arguments and the next ones are transformed into a common array.
988 # This attribute is meaning less on expressions not used as attributes.
989 var vararg_decl
: Int = 0
991 redef fun dump_info
(v
) do
993 var mtype
= self.mtype
994 if mtype
!= null then
995 res
+= v
.yellow
(":{mtype}")
997 var ict
= self.implicit_cast_to
999 res
+= v
.yellow
("(.as({ict}))")
1005 redef class ABlockExpr
1006 redef fun accept_typing
(v
)
1008 for e
in self.n_expr
do v
.visit_stmt
(e
)
1009 self.is_typed
= true
1012 # The type of a blockexpr is the one of the last expression (or null if empty)
1015 if self.n_expr
.is_empty
then return null
1016 return self.n_expr
.last
.mtype
1020 redef class AVardeclExpr
1021 redef fun accept_typing
(v
)
1023 var variable
= self.variable
1024 if variable
== null then return # Skip error
1026 var ntype
= self.n_type
1027 var mtype
: nullable MType
1028 if ntype
== null then
1031 mtype
= v
.resolve_mtype
(ntype
)
1032 if mtype
== null then return # Skip error
1035 var nexpr
= self.n_expr
1036 if nexpr
!= null then
1037 if mtype
!= null then
1038 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
1039 if etype
== mtype
then
1040 assert ntype
!= null
1041 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
1044 mtype
= v
.visit_expr
(nexpr
)
1045 if mtype
== null then return # Skip error
1049 var decltype
= mtype
1050 if mtype
== null or mtype
isa MNullType then
1051 var objclass
= v
.get_mclass
(self, "Object")
1052 if objclass
== null then return # skip error
1053 decltype
= objclass
.mclass_type
.as_nullable
1054 if mtype
== null then mtype
= decltype
1057 variable
.declared_type
= decltype
1058 v
.set_variable
(self, variable
, mtype
)
1060 #debug("var {variable}: {mtype}")
1063 self.is_typed
= true
1067 redef class AVarExpr
1068 redef fun its_variable
do return self.variable
1069 redef fun accept_typing
(v
)
1071 var variable
= self.variable
1072 if variable
== null then return # Skip error
1074 var mtype
= v
.get_variable
(self, variable
)
1075 if mtype
!= null then
1076 #debug("{variable} is {mtype}")
1078 #debug("{variable} is untyped")
1085 redef class AVarAssignExpr
1086 redef fun accept_typing
(v
)
1088 var variable
= self.variable
1089 assert variable
!= null
1091 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
1093 v
.set_variable
(self, variable
, mtype
)
1095 self.is_typed
= true
1099 redef class AReassignFormExpr
1100 # The method designed by the reassign operator.
1101 var reassign_callsite
: nullable CallSite
1103 var read_type
: nullable MType = null
1105 # Determine the `reassign_property`
1106 # `readtype` is the type of the reading of the left value.
1107 # `writetype` is the type of the writing of the left value.
1108 # (Because of `ACallReassignExpr`, both can be different.
1109 # Return the static type of the value to store.
1110 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
1112 var reassign_name
= self.n_assign_op
.operator
1114 self.read_type
= readtype
1116 var callsite
= v
.get_method
(self.n_assign_op
, readtype
, reassign_name
, false)
1117 if callsite
== null then return null # Skip error
1118 self.reassign_callsite
= callsite
1120 var msignature
= callsite
.msignature
1121 var rettype
= msignature
.return_mtype
1122 assert msignature
.arity
== 1 and rettype
!= null
1124 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
1125 if value_type
== null then return null # Skip error
1127 v
.check_subtype
(self, rettype
, writetype
, false)
1132 redef class AVarReassignExpr
1133 redef fun accept_typing
(v
)
1135 var variable
= self.variable
1136 assert variable
!= null
1138 var readtype
= v
.get_variable
(self, variable
)
1139 if readtype
== null then return
1141 read_type
= readtype
1143 var writetype
= variable
.declared_type
1144 if writetype
== null then return
1146 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
1148 v
.set_variable
(self, variable
, rettype
)
1150 self.is_typed
= rettype
!= null
1155 redef class AContinueExpr
1156 redef fun accept_typing
(v
)
1158 var nexpr
= self.n_expr
1159 if nexpr
!= null then
1162 self.is_typed
= true
1166 redef class ABreakExpr
1167 redef fun accept_typing
(v
)
1169 var nexpr
= self.n_expr
1170 if nexpr
!= null then
1173 self.is_typed
= true
1177 redef class AReturnExpr
1178 redef fun accept_typing
(v
)
1180 var nexpr
= self.n_expr
1182 var mpropdef
= v
.mpropdef
1183 if mpropdef
isa MMethodDef then
1184 ret_type
= mpropdef
.msignature
.return_mtype
1185 else if mpropdef
isa MAttributeDef then
1186 ret_type
= mpropdef
.static_mtype
1190 if nexpr
!= null then
1191 if ret_type
!= null then
1192 v
.visit_expr_subtype
(nexpr
, ret_type
)
1195 v
.error
(nexpr
, "Error: `return` with value in a procedure.")
1198 else if ret_type
!= null then
1199 v
.error
(self, "Error: `return` without value in a function.")
1202 self.is_typed
= true
1206 redef class AAbortExpr
1207 redef fun accept_typing
(v
)
1209 self.is_typed
= true
1214 redef fun accept_typing
(v
)
1216 v
.visit_expr_bool
(n_expr
)
1218 v
.visit_stmt
(n_then
)
1219 v
.visit_stmt
(n_else
)
1221 self.is_typed
= true
1223 if n_then
!= null and n_else
== null then
1224 self.mtype
= n_then
.mtype
1229 redef class AIfexprExpr
1230 redef fun accept_typing
(v
)
1232 v
.visit_expr_bool
(n_expr
)
1234 var t1
= v
.visit_expr
(n_then
)
1235 var t2
= v
.visit_expr
(n_else
)
1237 if t1
== null or t2
== null then
1241 var t
= v
.merge_types
(self, [t1
, t2
])
1243 v
.error
(self, "Type Error: ambiguous type `{t1}` vs `{t2}`.")
1250 redef fun accept_typing
(v
)
1252 v
.visit_stmt
(n_block
)
1253 v
.visit_stmt
(n_catch
)
1254 self.is_typed
= true
1258 redef class AWhileExpr
1259 redef fun accept_typing
(v
)
1262 v
.visit_expr_bool
(n_expr
)
1263 v
.visit_stmt
(n_block
)
1264 self.is_typed
= true
1268 redef class ALoopExpr
1269 redef fun accept_typing
(v
)
1272 v
.visit_stmt
(n_block
)
1273 self.is_typed
= true
1277 redef class AForExpr
1278 redef fun accept_typing
(v
)
1282 for g
in n_groups
do
1283 var mtype
= v
.visit_expr
(g
.n_expr
)
1284 if mtype
== null then return
1285 g
.do_type_iterator
(v
, mtype
)
1286 if g
.is_broken
then is_broken
= true
1289 v
.visit_stmt
(n_block
)
1291 self.mtype
= n_block
.mtype
1292 self.is_typed
= true
1296 redef class AForGroup
1297 var coltype
: nullable MClassType
1299 var method_iterator
: nullable CallSite
1300 var method_is_ok
: nullable CallSite
1301 var method_item
: nullable CallSite
1302 var method_next
: nullable CallSite
1303 var method_key
: nullable CallSite
1304 var method_finish
: nullable CallSite
1306 var method_lt
: nullable CallSite
1307 var method_successor
: nullable CallSite
1309 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1311 if mtype
isa MNullType then
1312 v
.error
(self, "Type Error: `for` cannot iterate over `null`.")
1317 var objcla
= v
.get_mclass
(self, "Object")
1318 if objcla
== null then return
1320 # check iterator method
1321 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1322 if itdef
== null then
1323 v
.error
(self, "Type Error: `for` expects a type providing an `iterator` method, got `{mtype}`.")
1326 self.method_iterator
= itdef
1328 # check that iterator return something
1329 var ittype
= itdef
.msignature
.return_mtype
1330 if ittype
== null then
1331 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1336 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1337 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1341 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1343 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1344 var variables
= self.variables
1345 if variables
.length
!= 1 then
1346 v
.error
(self, "Type Error: `for` expects only one variable when using `Iterator`.")
1348 variables
.first
.declared_type
= coltype
.arguments
.first
1353 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1355 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1356 var variables
= self.variables
1357 if variables
.length
!= 2 then
1358 v
.error
(self, "Type Error: `for` expects two variables when using `MapIterator`.")
1360 variables
[0].declared_type
= coltype
.arguments
[0]
1361 variables
[1].declared_type
= coltype
.arguments
[1]
1366 if not is_col
and not is_map
then
1367 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1371 # anchor formal and virtual types
1372 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1374 mtype
= mtype
.undecorate
1375 self.coltype
= mtype
.as(MClassType)
1377 # get methods is_ok, next, item
1378 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1379 if ikdef
== null then
1380 v
.error
(self, "Type Error: `for` expects a method `is_ok` in type `{ittype}`.")
1383 self.method_is_ok
= ikdef
1385 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1386 if itemdef
== null then
1387 v
.error
(self, "Type Error: `for` expects a method `item` in type `{ittype}`.")
1390 self.method_item
= itemdef
1392 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1393 if nextdef
== null then
1394 v
.error
(self, "Type Error: `for` expects a method `next` in type {ittype}.")
1397 self.method_next
= nextdef
1399 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1402 var keydef
= v
.get_method
(self, ittype
, "key", false)
1403 if keydef
== null then
1404 v
.error
(self, "Type Error: `for` expects a method `key` in type `{ittype}`.")
1407 self.method_key
= keydef
1410 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1411 var variable
= variables
.first
1412 var vtype
= variable
.declared_type
.as(not null)
1414 if n_expr
isa AOrangeExpr then
1415 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1417 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1420 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1425 redef class AWithExpr
1426 var method_start
: nullable CallSite
1427 var method_finish
: nullable CallSite
1429 redef fun accept_typing
(v
: TypeVisitor)
1431 var mtype
= v
.visit_expr
(n_expr
)
1432 if mtype
== null then return
1434 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1435 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1437 v
.visit_stmt
(n_block
)
1438 self.mtype
= n_block
.mtype
1439 self.is_typed
= true
1443 redef class AAssertExpr
1444 redef fun accept_typing
(v
)
1446 v
.visit_expr_bool
(n_expr
)
1448 v
.visit_stmt
(n_else
)
1449 self.is_typed
= true
1454 redef fun accept_typing
(v
)
1456 v
.visit_expr_bool
(n_expr
)
1457 v
.visit_expr_bool
(n_expr2
)
1458 self.mtype
= v
.type_bool
(self)
1462 redef class AImpliesExpr
1463 redef fun accept_typing
(v
)
1465 v
.visit_expr_bool
(n_expr
)
1466 v
.visit_expr_bool
(n_expr2
)
1467 self.mtype
= v
.type_bool
(self)
1471 redef class AAndExpr
1472 redef fun accept_typing
(v
)
1474 v
.visit_expr_bool
(n_expr
)
1475 v
.visit_expr_bool
(n_expr2
)
1476 self.mtype
= v
.type_bool
(self)
1481 redef class ANotExpr
1482 redef fun accept_typing
(v
)
1484 v
.visit_expr_bool
(n_expr
)
1485 self.mtype
= v
.type_bool
(self)
1489 redef class AOrElseExpr
1490 redef fun accept_typing
(v
)
1492 var t1
= v
.visit_expr
(n_expr
)
1493 var t2
= v
.visit_expr
(n_expr2
)
1495 if t1
== null or t2
== null then
1499 if t1
isa MNullType then
1502 else if v
.can_be_null
(t1
) then
1506 var t
= v
.merge_types
(self, [t1
, t2
])
1508 var c
= v
.get_mclass
(self, "Object")
1509 if c
== null then return # forward error
1511 if v
.can_be_null
(t2
) then
1514 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1519 redef fun accept_post_typing
(v
)
1521 var t1
= n_expr
.mtype
1525 v
.check_can_be_null
(n_expr
, t1
)
1530 redef class ATrueExpr
1531 redef fun accept_typing
(v
)
1533 self.mtype
= v
.type_bool
(self)
1537 redef class AFalseExpr
1538 redef fun accept_typing
(v
)
1540 self.mtype
= v
.type_bool
(self)
1544 redef class AIntegerExpr
1545 redef fun accept_typing
(v
)
1547 var mclass
: nullable MClass = null
1548 if value
isa Byte then
1549 mclass
= v
.get_mclass
(self, "Byte")
1550 else if value
isa Int then
1551 mclass
= v
.get_mclass
(self, "Int")
1552 else if value
isa Int8 then
1553 mclass
= v
.get_mclass
(self, "Int8")
1554 else if value
isa Int16 then
1555 mclass
= v
.get_mclass
(self, "Int16")
1556 else if value
isa UInt16 then
1557 mclass
= v
.get_mclass
(self, "UInt16")
1558 else if value
isa Int32 then
1559 mclass
= v
.get_mclass
(self, "Int32")
1560 else if value
isa UInt32 then
1561 mclass
= v
.get_mclass
(self, "UInt32")
1563 if mclass
== null then return # Forward error
1564 self.mtype
= mclass
.mclass_type
1568 redef class AFloatExpr
1569 redef fun accept_typing
(v
)
1571 var mclass
= v
.get_mclass
(self, "Float")
1572 if mclass
== null then return # Forward error
1573 self.mtype
= mclass
.mclass_type
1577 redef class ACharExpr
1578 redef fun accept_typing
(v
) do
1579 var mclass
: nullable MClass = null
1580 if is_code_point
then
1581 mclass
= v
.get_mclass
(self, "Int")
1583 mclass
= v
.get_mclass
(self, "Char")
1585 if mclass
== null then return # Forward error
1586 self.mtype
= mclass
.mclass_type
1590 redef class AugmentedStringFormExpr
1593 # Text::to_re, used for prefix `re`
1594 var to_re
: nullable CallSite = null
1595 # Regex::ignore_case, used for suffix `i` on `re`
1596 var ignore_case
: nullable CallSite = null
1597 # Regex::newline, used for suffix `m` on `re`
1598 var newline
: nullable CallSite = null
1599 # Regex::extended, used for suffix `b` on `re`
1600 var extended
: nullable CallSite = null
1601 # CString::to_bytes_with_copy, used for prefix `b`
1602 var to_bytes_with_copy
: nullable CallSite = null
1604 redef fun accept_typing
(v
) do
1605 var mclass
= v
.get_mclass
(self, "String")
1606 if mclass
== null then return # Forward error
1607 if is_bytestring
then
1608 to_bytes_with_copy
= v
.get_method
(self, v
.mmodule
.c_string_type
, "to_bytes_with_copy", false)
1609 mclass
= v
.get_mclass
(self, "Bytes")
1611 to_re
= v
.get_method
(self, mclass
.mclass_type
, "to_re", false)
1612 for i
in suffix
.chars
do
1613 mclass
= v
.get_mclass
(self, "Regex")
1614 if mclass
== null then
1615 v
.error
(self, "Error: `Regex` class unknown")
1620 service
= "ignore_case="
1621 ignore_case
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1622 else if i
== 'm' then
1623 service
= "newline="
1624 newline
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1625 else if i
== 'b' then
1626 service
= "extended="
1627 extended
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1629 v
.error
(self, "Type Error: Unrecognized suffix {i} in prefixed Regex")
1634 if mclass
== null then return # Forward error
1635 mtype
= mclass
.mclass_type
1639 redef class ASuperstringExpr
1640 redef fun accept_typing
(v
)
1643 var objclass
= v
.get_mclass
(self, "Object")
1644 if objclass
== null then return # Forward error
1645 var objtype
= objclass
.mclass_type
1646 for nexpr
in self.n_exprs
do
1647 v
.visit_expr_subtype
(nexpr
, objtype
)
1652 redef class AArrayExpr
1653 # The `with_capacity` method on Array
1654 var with_capacity_callsite
: nullable CallSite
1656 # The `push` method on arrays
1657 var push_callsite
: nullable CallSite
1659 # The element of each type
1660 var element_mtype
: nullable MType
1662 # Set that `self` is a part of comprehension array `na`
1663 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1664 private fun set_comprehension
(n
: nullable AExpr)
1668 else if n
isa AForExpr then
1669 set_comprehension
(n
.n_block
)
1670 else if n
isa AIfExpr then
1671 set_comprehension
(n
.n_then
)
1672 set_comprehension
(n
.n_else
)
1675 n
.comprehension
= self
1678 redef fun accept_typing
(v
)
1680 var mtype
: nullable MType = null
1681 var ntype
= self.n_type
1682 if ntype
!= null then
1683 mtype
= v
.resolve_mtype
(ntype
)
1684 if mtype
== null then return # Skip error
1686 var mtypes
= new Array[nullable MType]
1688 for e
in self.n_exprs
do
1689 var t
= v
.visit_expr
(e
)
1693 set_comprehension
(e
)
1694 if mtype
!= null then
1695 if v
.check_subtype
(e
, t
, mtype
, false) == null then return # Forward error
1696 if t
== mtype
then useless
= true
1701 if mtype
== null then
1702 # Ensure monotony for type adaptation on loops
1703 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1704 mtype
= v
.merge_types
(self, mtypes
)
1706 if mtype
== null or mtype
isa MNullType then
1707 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1711 assert ntype
!= null
1712 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1715 self.element_mtype
= mtype
1717 var mclass
= v
.get_mclass
(self, "Array")
1718 if mclass
== null then return # Forward error
1719 var array_mtype
= mclass
.get_mtype
([mtype
])
1721 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1722 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1724 self.mtype
= array_mtype
1728 redef class ARangeExpr
1729 var init_callsite
: nullable CallSite
1731 redef fun accept_typing
(v
)
1733 var discrete_class
= v
.get_mclass
(self, "Discrete")
1734 if discrete_class
== null then return # Forward error
1735 var discrete_type
= discrete_class
.intro
.bound_mtype
1736 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1737 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1738 if t1
== null or t2
== null then return
1739 var mclass
= v
.get_mclass
(self, "Range")
1740 if mclass
== null then return # Forward error
1742 if v
.is_subtype
(t1
, t2
) then
1743 mtype
= mclass
.get_mtype
([t2
])
1744 else if v
.is_subtype
(t2
, t1
) then
1745 mtype
= mclass
.get_mtype
([t1
])
1747 v
.error
(self, "Type Error: cannot create range: `{t1}` vs `{t2}`.")
1753 # get the constructor
1755 if self isa ACrangeExpr then
1756 callsite
= v
.get_method
(self, mtype
, "init", false)
1757 else if self isa AOrangeExpr then
1758 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1762 init_callsite
= callsite
1766 redef class ANullExpr
1767 redef fun accept_typing
(v
)
1769 self.mtype
= v
.mmodule
.model
.null_type
1773 redef class AIsaExpr
1774 # The static type to cast to.
1775 # (different from the static type of the expression that is `Bool`).
1776 var cast_type
: nullable MType
1777 redef fun accept_typing
(v
)
1779 v
.visit_expr
(n_expr
)
1781 var mtype
= v
.resolve_mtype
(n_type
)
1783 self.cast_type
= mtype
1785 var variable
= self.n_expr
.its_variable
1786 if variable
!= null then
1787 var orig
= self.n_expr
.mtype
1788 #var from = if orig != null then orig.to_s else "invalid"
1789 #var to = if mtype != null then mtype.to_s else "invalid"
1790 #debug("adapt {variable}: {from} -> {to}")
1792 var thentype
= v
.intersect_types
(self, orig
, mtype
)
1793 if thentype
!= orig
then
1794 self.after_flow_context
.when_true
.set_var
(v
, variable
, thentype
)
1795 #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> then {thentype or else "?"}"
1798 var elsetype
= v
.diff_types
(self, orig
, mtype
)
1799 if elsetype
!= orig
then
1800 self.after_flow_context
.when_false
.set_var
(v
, variable
, elsetype
)
1801 #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> else {elsetype or else "?"}"
1805 self.mtype
= v
.type_bool
(self)
1808 redef fun accept_post_typing
(v
)
1810 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1813 redef fun dump_info
(v
) do
1815 var mtype
= self.cast_type
1816 if mtype
!= null then
1817 res
+= v
.yellow
(".as({mtype})")
1824 redef class AAsCastExpr
1825 redef fun accept_typing
(v
)
1827 v
.visit_expr
(n_expr
)
1829 self.mtype
= v
.resolve_mtype
(n_type
)
1832 redef fun accept_post_typing
(v
)
1834 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1838 redef class AAsNotnullExpr
1839 redef fun accept_typing
(v
)
1841 var mtype
= v
.visit_expr
(self.n_expr
)
1842 if mtype
== null then return # Forward error
1844 if mtype
isa MNullType then
1845 v
.error
(self, "Type Error: `as(not null)` on `null`.")
1849 if v
.can_be_null
(mtype
) then
1850 mtype
= mtype
.as_notnull
1856 redef fun accept_post_typing
(v
)
1858 var mtype
= n_expr
.mtype
1859 if mtype
== null then return
1860 v
.check_can_be_null
(n_expr
, mtype
)
1864 redef class AParExpr
1865 redef fun accept_typing
(v
)
1867 self.mtype
= v
.visit_expr
(self.n_expr
)
1871 redef class AOnceExpr
1872 redef fun accept_typing
(v
)
1874 self.mtype
= v
.visit_expr
(self.n_expr
)
1878 redef class ASelfExpr
1879 redef var its_variable
: nullable Variable
1880 redef fun accept_typing
(v
)
1882 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1883 v
.error
(self, "Error: `self` cannot be used in top-level method.")
1885 var variable
= v
.selfvariable
1886 self.its_variable
= variable
1887 self.mtype
= v
.get_variable
(self, variable
)
1891 redef class AImplicitSelfExpr
1892 # Is the implicit receiver `sys`?
1894 # By default, the implicit receiver is `self`.
1895 # But when there is not method for `self`, `sys` is used as a fall-back.
1896 # Is this case this flag is set to `true`.
1900 ## MESSAGE SENDING AND PROPERTY
1902 redef class ASendExpr
1903 # The property invoked by the send.
1904 var callsite
: nullable CallSite
1906 redef fun bad_expr_message
(child
)
1908 if child
== self.n_expr
then
1909 return "to be the receiver of `{self.property_name}`"
1914 redef fun accept_typing
(v
)
1916 var nrecv
= self.n_expr
1917 var recvtype
= v
.visit_expr
(nrecv
)
1918 var name
= self.property_name
1919 var node
= self.property_node
1921 if recvtype
== null then return # Forward error
1924 var unsafe_type
= v
.anchor_to
(recvtype
)
1925 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1926 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1927 # Special fall-back search in `sys` when noting found in the implicit receiver.
1928 var sysclass
= v
.try_get_mclass
(node
, "Sys")
1929 if sysclass
!= null then
1930 var systype
= sysclass
.mclass_type
1931 mproperty
= v
.try_get_mproperty_by_name2
(node
, systype
, name
)
1932 if mproperty
!= null then
1933 callsite
= v
.get_method
(node
, systype
, name
, false)
1934 if callsite
== null then return # Forward error
1935 # Update information, we are looking at `sys` now, not `self`
1937 nrecv
.its_variable
= null
1938 nrecv
.mtype
= systype
1943 if callsite
== null then
1944 # If still nothing, just exit
1945 callsite
= v
.get_method
(node
, recvtype
, name
, nrecv
isa ASelfExpr)
1946 if callsite
== null then return
1949 self.callsite
= callsite
1950 var msignature
= callsite
.msignature
1952 var args
= compute_raw_arguments
1954 callsite
.check_signature
(v
, node
, args
)
1956 if callsite
.mproperty
.is_init
then
1957 var vmpropdef
= v
.mpropdef
1958 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1959 v
.error
(node
, "Error: an `init` can only be called from another `init`.")
1961 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1962 v
.error
(node
, "Error: `{vmpropdef}` cannot call a factory `{callsite.mproperty}`.")
1966 var ret
= msignature
.return_mtype
1970 self.is_typed
= true
1974 # The name of the property
1975 # Each subclass simply provide the correct name.
1976 private fun property_name
: String is abstract
1978 # The node identifying the name (id, operator, etc) for messages.
1980 # Is `self` by default
1981 private fun property_node
: ANode do return self
1983 # An array of all arguments (excluding self)
1984 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1986 private fun compute_raw_arguments
: Array[AExpr] is abstract
1988 redef fun dump_info
(v
) do
1990 var callsite
= self.callsite
1991 if callsite
!= null then
1992 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
1998 redef class ABinopExpr
1999 redef fun compute_raw_arguments
do return [n_expr2
]
2000 redef fun property_name
do return operator
2001 redef fun property_node
do return n_op
2004 redef class AEqFormExpr
2005 redef fun accept_typing
(v
)
2011 redef fun accept_post_typing
(v
)
2013 var mtype
= n_expr
.mtype
2014 var mtype2
= n_expr2
.mtype
2016 if mtype
== null or mtype2
== null then return
2018 if mtype
== v
.type_bool
(self) and (n_expr2
isa AFalseExpr or n_expr2
isa ATrueExpr) then
2019 v
.modelbuilder
.warning
(self, "useless-truism", "Warning: useless comparison to a Bool literal.")
2022 if not mtype2
isa MNullType then return
2024 v
.check_can_be_null
(n_expr
, mtype
)
2028 redef class AUnaryopExpr
2029 redef fun property_name
do return "unary {operator}"
2030 redef fun compute_raw_arguments
do return new Array[AExpr]
2034 redef class ACallExpr
2035 redef fun property_name
do return n_qid
.n_id
.text
2036 redef fun property_node
do return n_qid
2037 redef fun compute_raw_arguments
do return n_args
.to_a
2040 redef class ACallAssignExpr
2041 redef fun property_name
do return n_qid
.n_id
.text
+ "="
2042 redef fun property_node
do return n_qid
2043 redef fun compute_raw_arguments
2045 var res
= n_args
.to_a
2051 redef class ABraExpr
2052 redef fun property_name
do return "[]"
2053 redef fun compute_raw_arguments
do return n_args
.to_a
2056 redef class ABraAssignExpr
2057 redef fun property_name
do return "[]="
2058 redef fun compute_raw_arguments
2060 var res
= n_args
.to_a
2066 redef class ASendReassignFormExpr
2067 # The property invoked for the writing
2068 var write_callsite
: nullable CallSite
2070 redef fun accept_typing
(v
)
2072 var recvtype
= v
.visit_expr
(self.n_expr
)
2073 var name
= self.property_name
2074 var node
= self.property_node
2076 if recvtype
== null then return # Forward error
2078 var for_self
= self.n_expr
isa ASelfExpr
2079 var callsite
= v
.get_method
(node
, recvtype
, name
, for_self
)
2081 if callsite
== null then return
2082 self.callsite
= callsite
2084 var args
= compute_raw_arguments
2086 callsite
.check_signature
(v
, node
, args
)
2088 var readtype
= callsite
.msignature
.return_mtype
2089 if readtype
== null then
2090 v
.error
(node
, "Error: `{name}` is not a function.")
2094 var wcallsite
= v
.get_method
(node
, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
2095 if wcallsite
== null then return
2096 self.write_callsite
= wcallsite
2098 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
2099 if wtype
== null then return
2101 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
2102 args
.add
(self.n_value
)
2103 wcallsite
.check_signature
(v
, node
, args
)
2105 self.is_typed
= true
2109 redef class ACallReassignExpr
2110 redef fun property_name
do return n_qid
.n_id
.text
2111 redef fun property_node
do return n_qid
.n_id
2112 redef fun compute_raw_arguments
do return n_args
.to_a
2115 redef class ABraReassignExpr
2116 redef fun property_name
do return "[]"
2117 redef fun compute_raw_arguments
do return n_args
.to_a
2120 redef class AInitExpr
2121 redef fun property_name
do return "init"
2122 redef fun property_node
do return n_kwinit
2123 redef fun compute_raw_arguments
do return n_args
.to_a
2127 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
2132 redef class ASuperExpr
2133 # The method to call if the super is in fact a 'super init call'
2134 # Note: if the super is a normal call-next-method, then this attribute is null
2135 var callsite
: nullable CallSite
2137 # The method to call is the super is a standard `call-next-method` super-call
2138 # Note: if the super is a special super-init-call, then this attribute is null
2139 var mpropdef
: nullable MMethodDef
2141 redef fun accept_typing
(v
)
2143 var anchor
= v
.anchor
2144 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2145 assert recvtype
!= null
2146 var mproperty
= v
.mpropdef
.mproperty
2147 if not mproperty
isa MMethod then
2148 v
.error
(self, "Error: `super` only usable in a `method`.")
2151 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
2152 if superprops
.length
== 0 then
2153 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
2154 process_superinit
(v
)
2157 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2160 # FIXME: covariance of return type in linear extension?
2161 var superprop
= superprops
.first
2163 var msignature
= superprop
.msignature
.as(not null)
2164 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2165 var args
= self.n_args
.to_a
2166 if args
.length
> 0 then
2167 signaturemap
= v
.check_signature
(self, args
, mproperty
, msignature
)
2169 self.mtype
= msignature
.return_mtype
2170 self.is_typed
= true
2171 v
.mpropdef
.has_supercall
= true
2172 mpropdef
= v
.mpropdef
.as(MMethodDef)
2175 # The mapping used on the call to associate arguments to parameters.
2176 # If null then no specific association is required.
2177 var signaturemap
: nullable SignatureMap
2179 private fun process_superinit
(v
: TypeVisitor)
2181 var anchor
= v
.anchor
2182 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2183 assert recvtype
!= null
2184 var mpropdef
= v
.mpropdef
2185 assert mpropdef
isa MMethodDef
2186 var mproperty
= mpropdef
.mproperty
2187 var superprop
: nullable MMethodDef = null
2188 for msupertype
in mpropdef
.mclassdef
.supertypes
do
2189 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
2190 var errcount
= v
.modelbuilder
.toolcontext
.error_count
2191 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
2192 if candidate
== null then
2193 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
2194 continue # Try next super-class
2196 if superprop
!= null and candidate
.is_root_init
then
2199 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
2200 v
.error
(self, "Error: conflicting super constructor to call for `{mproperty}`: `{candidate.full_name}`, `{superprop.mproperty.full_name}`")
2203 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
2204 if superprop
!= null and superprop
.mproperty
== candidate
then
2205 if superprop
== candidatedefs
.first
then continue
2206 candidatedefs
.add
(superprop
)
2208 if candidatedefs
.length
> 1 then
2209 v
.error
(self, "Error: conflicting property definitions for property `{mproperty}` in `{recvtype}`: {candidatedefs.join(", ")}")
2212 superprop
= candidatedefs
.first
2214 if superprop
== null then
2215 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2219 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
2220 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2222 var callsite
= new CallSite(hot_location
, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
2223 self.callsite
= callsite
2225 var args
= self.n_args
.to_a
2226 if args
.length
> 0 then
2227 callsite
.check_signature
(v
, self, args
)
2229 # Check there is at least enough parameters
2230 if mpropdef
.msignature
.arity
< msignature
.arity
then
2231 v
.error
(self, "Error: not enough implicit arguments to pass. Got `{mpropdef.msignature.arity}`, expected at least `{msignature.arity}`. Signature is `{msignature}`.")
2234 # Check that each needed parameter is conform
2236 for sp
in msignature
.mparameters
do
2237 var p
= mpropdef
.msignature
.mparameters
[i
]
2238 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
2239 v
.error
(self, "Type Error: expected argument #{i} of type `{sp.mtype}`, got implicit argument `{p.name}` of type `{p.mtype}`. Signature is {msignature}")
2246 self.is_typed
= true
2249 redef fun dump_info
(v
) do
2251 var callsite
= self.callsite
2252 if callsite
!= null then
2253 res
+= v
.yellow
(" super-init="+callsite
.dump_info
(v
))
2255 var mpropdef
= self.mpropdef
2256 if mpropdef
!= null then
2257 res
+= v
.yellow
(" call-next-method="+mpropdef
.to_s
)
2265 redef class ANewExpr
2266 # The constructor invoked by the new.
2267 var callsite
: nullable CallSite
2269 # The designated type
2270 var recvtype
: nullable MClassType
2272 redef fun accept_typing
(v
)
2274 var recvtype
= v
.resolve_mtype
(self.n_type
)
2275 if recvtype
== null then return
2277 if not recvtype
isa MClassType then
2278 if recvtype
isa MNullableType then
2279 v
.error
(self, "Type Error: cannot instantiate the nullable type `{recvtype}`.")
2281 else if recvtype
isa MFormalType then
2282 v
.error
(self, "Type Error: cannot instantiate the formal type `{recvtype}`.")
2285 v
.error
(self, "Type Error: cannot instantiate the type `{recvtype}`.")
2290 self.recvtype
= recvtype
2291 var kind
= recvtype
.mclass
.kind
2294 var nqid
= self.n_qid
2296 if nqid
!= null then
2297 name
= nqid
.n_id
.text
2303 if name
== "intern" then
2304 if kind
!= concrete_kind
then
2305 v
.error
(self, "Type Error: cannot instantiate {kind} {recvtype}.")
2308 if n_args
.n_exprs
.not_empty
then
2309 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
2313 self.mtype
= recvtype
2317 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
2318 if callsite
== null then return
2320 if not callsite
.mproperty
.is_new
then
2321 if kind
!= concrete_kind
then
2322 v
.error
(self, "Type Error: cannot instantiate {kind} `{recvtype}`.")
2325 self.mtype
= recvtype
2327 self.mtype
= callsite
.msignature
.return_mtype
2328 assert self.mtype
!= null
2331 self.callsite
= callsite
2333 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
2334 v
.error
(self, "Error: `{name}` is not a constructor.")
2338 var args
= n_args
.to_a
2339 callsite
.check_signature
(v
, node
, args
)
2342 redef fun dump_info
(v
) do
2344 var callsite
= self.callsite
2345 if callsite
!= null then
2346 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
2354 redef class AAttrFormExpr
2355 # The attribute accessed.
2356 var mproperty
: nullable MAttribute
2358 # The static type of the attribute.
2359 var attr_type
: nullable MType
2361 # Resolve the attribute accessed.
2362 private fun resolve_property
(v
: TypeVisitor)
2364 var recvtype
= v
.visit_expr
(self.n_expr
)
2365 if recvtype
== null then return # Skip error
2366 var node
= self.n_id
2367 var name
= node
.text
2368 if recvtype
isa MNullType then
2369 v
.error
(node
, "Error: attribute `{name}` access on `null`.")
2373 var unsafe_type
= v
.anchor_to
(recvtype
)
2374 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
2375 if mproperty
== null then
2376 v
.modelbuilder
.error
(node
, "Error: attribute `{name}` does not exist in `{recvtype}`.")
2379 assert mproperty
isa MAttribute
2380 self.mproperty
= mproperty
2382 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
2383 assert mpropdefs
.length
== 1
2384 var mpropdef
= mpropdefs
.first
2385 var attr_type
= mpropdef
.static_mtype
2386 if attr_type
== null then return # skip error
2387 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
2388 self.attr_type
= attr_type
2391 redef fun dump_info
(v
) do
2393 var mproperty
= self.mproperty
2394 var attr_type
= self.attr_type
2395 if mproperty
!= null then
2396 res
+= v
.yellow
(" attr={mproperty}:{attr_type or else "BROKEN"}")
2402 redef class AAttrExpr
2403 redef fun accept_typing
(v
)
2405 self.resolve_property
(v
)
2406 self.mtype
= self.attr_type
2411 redef class AAttrAssignExpr
2412 redef fun accept_typing
(v
)
2414 self.resolve_property
(v
)
2415 var mtype
= self.attr_type
2417 v
.visit_expr_subtype
(self.n_value
, mtype
)
2418 self.is_typed
= mtype
!= null
2422 redef class AAttrReassignExpr
2423 redef fun accept_typing
(v
)
2425 self.resolve_property
(v
)
2426 var mtype
= self.attr_type
2427 if mtype
== null then return # Skip error
2429 var rettype
= self.resolve_reassignment
(v
, mtype
, mtype
)
2431 self.is_typed
= rettype
!= null
2435 redef class AIssetAttrExpr
2436 redef fun accept_typing
(v
)
2438 self.resolve_property
(v
)
2439 var mtype
= self.attr_type
2440 if mtype
== null then return # Skip error
2442 var recvtype
= self.n_expr
.mtype
.as(not null)
2443 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2444 if bound
isa MNullableType then
2445 v
.error
(n_id
, "Type Error: `isset` on a nullable attribute.")
2447 self.mtype
= v
.type_bool
(self)
2451 redef class AVarargExpr
2452 redef fun accept_typing
(v
)
2454 # This kind of pseudo-expression can be only processed trough a signature
2455 # See `check_signature`
2456 # Other cases are a syntax error.
2457 v
.error
(self, "Syntax Error: unexpected `...`.")
2463 redef class ADebugTypeExpr
2464 redef fun accept_typing
(v
)
2466 var expr
= v
.visit_expr
(self.n_expr
)
2467 if expr
== null then return
2468 var unsafe
= v
.anchor_to
(expr
)
2469 var ntype
= self.n_type
2470 var mtype
= v
.resolve_mtype
(ntype
)
2471 if mtype
!= null and mtype
!= expr
then
2472 var umtype
= v
.anchor_to
(mtype
)
2473 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2475 self.is_typed
= true