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 var mclassdef
= mpropdef
.mclassdef
65 self.mclassdef
= mclassdef
66 self.anchor
= mclassdef
.bound_mtype
68 var mclass
= mclassdef
.mclass
70 var selfvariable
= new Variable("self")
71 self.selfvariable
= selfvariable
72 selfvariable
.declared_type
= mclass
.mclass_type
74 var mprop
= mpropdef
.mproperty
75 if mprop
isa MMethod and mprop
.is_new
then
76 is_toplevel_context
= true
81 fun anchor_to
(mtype
: MType): MType
83 return mtype
.anchor_to
(mmodule
, anchor
)
86 fun is_subtype
(sub
, sup
: MType): Bool
88 return sub
.is_subtype
(mmodule
, anchor
, sup
)
91 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
93 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
94 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
98 # Check that `sub` is a subtype of `sup`.
99 # If `sub` is not a valid suptype, then display an error on `node` and return `null`.
100 # If `sub` is a safe subtype of `sup`, then return `sub`.
101 # If `sub` is an unsafe subtype (i.e., an implicit cast is required), then return `sup`.
103 # The point of the return type is to determinate the usable type on an expression when `autocast` is true:
104 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
105 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
106 fun check_subtype
(node
: ANode, sub
, sup
: MType, autocast
: Bool): nullable MType
108 if self.is_subtype
(sub
, sup
) then return sub
109 if autocast
and self.is_subtype
(sub
, self.anchor_to
(sup
)) then
110 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
111 #node.debug("Unsafe typing: expected {sup}, got {sub}")
114 if sup
isa MErrorType then return null # Skip error
115 if sub
.need_anchor
then
116 var u
= anchor_to
(sub
)
117 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}: {u}`.")
119 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}`.")
124 # Visit an expression and do not care about the return value
125 fun visit_stmt
(nexpr
: nullable AExpr)
127 if nexpr
== null then return
128 nexpr
.accept_typing
(self)
131 # Visit an expression and expects that it is not a statement
132 # Return the type of the expression
133 # Display an error and return null if:
134 # * the type cannot be determined or
135 # * `nexpr` is a statement
136 fun visit_expr
(nexpr
: AExpr): nullable MType
138 nexpr
.accept_typing
(self)
139 var mtype
= nexpr
.mtype
140 if mtype
!= null then return mtype
141 if not nexpr
.is_typed
then
142 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
143 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
144 nexpr
.debug
("No return type but no error.")
147 return null # forward error
149 var more_message
= null
151 if p
!= null then more_message
= p
.bad_expr_message
(nexpr
)
152 if more_message
== null then more_message
= "" else more_message
= " " + more_message
153 self.error
(nexpr
, "Error: expected an expression{more_message}.")
157 # Visit an expression and expect its static type is a least a `sup`
158 # Return the type of the expression or null if
159 # * the type cannot be determined or
160 # * `nexpr` is a statement or
161 # * `nexpr` is not a `sup`
162 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
164 var sub
= visit_expr
(nexpr
)
165 if sub
== null then return null # Forward error
167 if sup
== null then return null # Forward error
169 var res
= check_subtype
(nexpr
, sub
, sup
, true)
171 nexpr
.implicit_cast_to
= res
176 # Visit an expression and expect its static type is a `Bool`
177 # Return the type of the expression or null if
178 # * the type cannot be determined or
179 # * `nexpr` is a statement or
180 # * `nexpr` is not a `Bool`
181 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
183 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
187 fun check_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
189 var sub
= nexpr
.mtype
190 if sub
== null then return null # Forward error
192 var sup
= ntype
.mtype
193 if sup
== null then return null # Forward error
196 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}`.")
197 else if self.is_subtype
(sub
, sup
) then
198 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}` since it is a `{sub}`.")
203 # Can `mtype` be null (up to the current knowledge)?
204 fun can_be_null
(mtype
: MType): Bool
206 if mtype
isa MNullableType or mtype
isa MNullType then return true
207 if mtype
isa MFormalType then
208 var x
= anchor_to
(mtype
)
209 if x
isa MNullableType or x
isa MNullType then return true
214 # Check that `mtype` can be null (up to the current knowledge).
216 # If not then display a `useless-null-test` warning on node and return false.
218 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
220 if mtype
isa MNullType then
221 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is always `null`.")
224 if can_be_null
(mtype
) then return true
226 if mtype
isa MFormalType then
227 var res
= anchor_to
(mtype
)
228 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
230 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
235 # Special verification on != and == for null
237 fun null_test
(anode
: ABinopExpr)
239 var mtype
= anode
.n_expr
.mtype
240 var mtype2
= anode
.n_expr2
.mtype
242 if mtype
== null or mtype2
== null then return
244 if not mtype2
isa MNullType then return
246 # Check of useless null
247 if not can_be_null
(mtype
) then return
249 if mtype
isa MNullType then
250 # Because of type adaptation, we cannot just stop here
251 # so return use `null` as a bottom type that will be merged easily (cf) `merge_types`
254 mtype
= mtype
.as_notnull
257 # Check for type adaptation
258 var variable
= anode
.n_expr
.its_variable
259 if variable
== null then return
261 # One is null (mtype2 see above) the other is not null
262 if anode
isa AEqExpr then
263 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype2
)
264 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype
)
265 else if anode
isa ANeExpr then
266 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype2
)
267 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype
)
273 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
275 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
278 fun resolve_mtype
(node
: AType): nullable MType
280 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
283 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
285 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
289 fun get_mclass
(node
: ANode, name
: String): nullable MClass
291 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
295 fun type_bool
(node
: ANode): nullable MType
297 var mclass
= self.get_mclass
(node
, "Bool")
298 if mclass
== null then return null
299 return mclass
.mclass_type
302 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
304 var unsafe_type
= self.anchor_to
(recvtype
)
306 #debug("recv: {recvtype} (aka {unsafe_type})")
307 if recvtype
isa MNullType then
308 var objclass
= get_mclass
(node
, "Object")
309 if objclass
== null then return null # Forward error
310 unsafe_type
= objclass
.mclass_type
313 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
314 if name
== "new" and mproperty
== null then
316 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
319 if mproperty
== null then
321 self.modelbuilder
.error
(node
, "Error: method or variable `{name}` unknown in `{recvtype}`.")
322 else if recvtype
.need_anchor
then
323 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}: {unsafe_type}`.")
325 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}`.")
330 assert mproperty
isa MMethod
332 # `null` only accepts some methods of object.
333 if recvtype
isa MNullType and not mproperty
.is_null_safe
then
334 self.error
(node
, "Error: method `{name}` called on `null`.")
336 else if unsafe_type
isa MNullableType and not mproperty
.is_null_safe
then
337 modelbuilder
.advice
(node
, "call-on-nullable", "Warning: method call on a nullable receiver `{recvtype}`.")
340 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
341 error
(node
, "Error: `{name}` is not a top-level method, thus need a receiver.")
343 if not recv_is_self
and mproperty
.is_toplevel
then
344 error
(node
, "Error: cannot call `{name}`, a top-level method, with a receiver.")
347 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
348 self.modelbuilder
.error
(node
, "Error: method `{name}` is protected and can only accessed by `self`.")
352 var info
= mproperty
.deprecation
353 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
356 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated: {mdoc.content.first}")
358 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated.")
362 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
364 if propdefs
.length
== 0 then
365 self.modelbuilder
.error
(node
, "Type Error: no definition found for property `{name}` in `{unsafe_type}`.")
367 else if propdefs
.length
== 1 then
368 mpropdef
= propdefs
.first
370 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property `{name}` in `{unsafe_type}`: {propdefs.join(" ")}")
371 mpropdef
= mproperty
.intro
375 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
376 if msignature
== null then return null # skip error
377 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
379 var erasure_cast
= false
380 var rettype
= mpropdef
.msignature
.return_mtype
381 if not recv_is_self
and rettype
!= null then
382 rettype
= rettype
.undecorate
383 if rettype
isa MParameterType then
384 var erased_rettype
= msignature
.return_mtype
385 assert erased_rettype
!= null
386 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
391 var callsite
= new CallSite(node
.hot_location
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
395 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
397 var unsafe_type
= self.anchor_to
(recvtype
)
398 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
399 if mproperty
== null then return null
400 return get_method
(node
, recvtype
, name
, recv_is_self
)
404 # Visit the expressions of args and check their conformity with the corresponding type in signature
405 # The point of this method is to handle varargs correctly
406 # Note: The signature must be correctly adapted
407 fun check_signature
(node
: ANode, args
: Array[AExpr], mproperty
: MProperty, msignature
: MSignature): nullable SignatureMap
409 var vararg_rank
= msignature
.vararg_rank
410 if vararg_rank
>= 0 then
411 if args
.length
< msignature
.arity
then
412 modelbuilder
.error
(node
, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
415 else if args
.length
!= msignature
.arity
then
417 if args
.length
> msignature
.arity
then
418 modelbuilder
.error
(node
, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
421 # Other cases are managed later
425 #debug("CALL {unsafe_type}.{msignature}")
427 # Associate each parameter to a position in the arguments
428 var map
= new SignatureMap
430 # Special case for the isolated last argument
431 # TODO: reify this method characteristics (where? the param, the signature, the method?)
432 var last_is_padded
= mproperty
.name
.chars
.last
== '='
433 var nbargs
= args
.length
434 if last_is_padded
then
436 assert not args
.last
isa ANamedargExpr
437 map
.map
[msignature
.arity
- 1] = args
.length
- 1
438 self.visit_expr_subtype
(args
.last
, msignature
.mparameters
.last
.mtype
)
441 # First, handle named arguments
442 for i
in [0..args
.length
[ do
444 if not e
isa ANamedargExpr then continue
445 var name
= e
.n_id
.text
446 var param
= msignature
.mparameter_by_name
(name
)
447 if param
== null then
448 modelbuilder
.error
(e
.n_id
, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
451 var idx
= msignature
.mparameters
.index_of
(param
)
452 var prev
= map
.map
.get_or_null
(idx
)
454 modelbuilder
.error
(e
, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
458 e
.mtype
= self.visit_expr_subtype
(e
.n_expr
, param
.mtype
)
461 # Number of minimum mandatory remaining parameters
464 # Second, associate remaining parameters
465 var vararg_decl
= args
.length
- msignature
.arity
467 for i
in [0..msignature
.arity
[ do
468 # Skip parameters associated by name
469 if map
.map
.has_key
(i
) then continue
471 var param
= msignature
.mparameters
[i
]
473 # Search the next free argument: skip named arguments since they are already associated
474 while j
< nbargs
and args
[j
] isa ANamedargExpr do j
+= 1
476 if not param
.mtype
isa MNullableType then
486 if i
== vararg_rank
then
488 continue # skip the vararg
491 if not param
.is_vararg
then
492 var paramtype
= param
.mtype
493 self.visit_expr_subtype
(arg
, paramtype
)
495 check_one_vararg
(arg
, param
)
499 if min_arity
> 0 then
500 if last_is_padded
then min_arity
+= 1
501 if min_arity
< msignature
.arity
then
502 modelbuilder
.error
(node
, "Error: expected at least {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
504 modelbuilder
.error
(node
, "Error: expected {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
509 # Third, check varargs
510 if vararg_rank
>= 0 then
511 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
512 var first
= args
[vararg_rank
]
513 if vararg_decl
== 0 then
514 if not check_one_vararg
(first
, msignature
.mparameters
[vararg_rank
]) then return null
516 first
.vararg_decl
= vararg_decl
+ 1
517 for i
in [vararg_rank
..vararg_rank
+vararg_decl
] do
518 self.visit_expr_subtype
(args
[i
], paramtype
)
526 # Check an expression as a single vararg.
527 # The main point of the method if to handle the case of reversed vararg (see `AVarargExpr`)
528 fun check_one_vararg
(arg
: AExpr, param
: MParameter): Bool
530 var paramtype
= param
.mtype
531 var mclass
= get_mclass
(arg
, "Array")
532 if mclass
== null then return false # Forward error
533 var array_mtype
= mclass
.get_mtype
([paramtype
])
534 if arg
isa AVarargExpr then
535 self.visit_expr_subtype
(arg
.n_expr
, array_mtype
)
536 arg
.mtype
= arg
.n_expr
.mtype
538 # only one vararg, maybe `...` was forgot, so be gentle!
539 var t
= visit_expr
(arg
)
540 if t
== null then return false # Forward error
541 if not is_subtype
(t
, paramtype
) and is_subtype
(t
, array_mtype
) then
542 # Not acceptable but could be a `...`
543 error
(arg
, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
546 # Standard valid vararg, finish the job
548 self.visit_expr_subtype
(arg
, paramtype
)
553 fun error
(node
: ANode, message
: String)
555 self.modelbuilder
.error
(node
, message
)
558 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
560 if not variable
.is_adapted
then return variable
.declared_type
562 var flow
= node
.after_flow_context
563 if flow
== null then return null # skip error
565 if flow
.vars
.has_key
(variable
) then
566 return flow
.vars
[variable
]
568 #node.debug("*** START Collected for {variable}")
569 var mtypes
= flow
.collect_types
(variable
)
570 #node.debug("**** END Collected for {variable}")
571 if mtypes
.length
== 0 then
572 return variable
.declared_type
573 else if mtypes
.length
== 1 then
576 var res
= merge_types
(node
,mtypes
)
578 res
= variable
.declared_type
579 # Try to fallback to a non-null version
580 if res
!= null and can_be_null
(res
) then do
582 if t
!= null and can_be_null
(t
) then break label
592 # Some variables where type-adapted during the visit
595 # Some loops had been visited during the visit
598 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
600 var flow
= node
.after_flow_context
603 flow
.set_var
(self, variable
, mtype
)
606 # Find the exact representable most specific common super-type in `col`.
608 # Try to find the most specific common type that is a super-type of each types
610 # In most cases, the result is simply the most general type in `col`.
611 # If nullables types are involved, then the nullable information is correctly preserved.
612 # If incomparable super-types exists in `col`, them no solution is given and the `null`
613 # value is returned (since union types are non representable in Nit)
615 # The `null` values in `col` are ignored, nulltypes (MNullType) are considered.
617 # Returns the `null` value if:
620 # * `col` only have null values
621 # * there is a conflict
623 # Example (with a diamond A,B,C,D):
625 # * merge(A,B,C) -> A, because A is the most general type in {A,B,C}
626 # * merge(C,B) -> null, there is conflict, because `B or C` cannot be represented
627 # * merge(A,nullable B) -> nullable A, because A is the most general type and
628 # the nullable information is preserved
629 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
631 if col
.length
== 1 then return col
.first
633 if t1
== null then continue # return null
636 if t2
== null then continue # return null
637 if can_be_null
(t2
) and not can_be_null
(t1
) then
640 if not is_subtype
(t2
, t1
) then found
= false
643 #print "merge {col.join(" ")} -> {t1}"
647 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
651 # Find a most general common subtype between `type1` and `type2`.
653 # Find the most general type that is a subtype of `type2` and, if possible, a subtype of `type1`.
654 # Basically, this return the most specific type between `type1` and `type2`.
655 # If nullable types are involved, the information is correctly preserved.
656 # If `type1` and `type2` are incomparable then `type2` is preferred (since intersection types
657 # are not representable in Nit).
659 # The `null` value is returned if both `type1` and `type2` are null.
661 # Examples (with diamond A,B,C,D):
663 # * intersect_types(A,B) -> B, because B is a subtype of A
664 # * intersect_types(B,A) -> B, because B is a subtype of A
665 # * intersect_types(B,C) -> C, B and C are incomparable,
666 # `type2` is then preferred (`B and C` cannot be represented)
667 # * intersect_types(nullable B,A) -> B, because B<:A and the non-null information is preserved
668 # * intersect_types(B,nullable C) -> C, `type2` is preferred and the non-null information is preserved
669 fun intersect_types
(node
: ANode, type1
, type2
: nullable MType): nullable MType
671 if type1
== null then return type2
672 if type2
== null then return type1
674 if not can_be_null
(type2
) or not can_be_null
(type1
) then
675 type1
= type1
.as_notnull
676 type2
= type2
.as_notnull
680 if is_subtype
(type1
, type2
) then
688 # Find a most general type that is a subtype of `type1` but not one of `type2`.
690 # Basically, this returns `type1`-`type2` but since there is no substraction type
691 # in Nit this just returns `type1` most of the case.
693 # The few other cases are if `type2` is a super-type and if some nullable information
696 # The `null` value is returned if `type1` is null.
698 # Examples (with diamond A,B,C,D):
700 # * diff_types(A,B) -> A, because the notB cannot be represented
701 # * diff_types(B,A) -> None (absurd type), because B<:A
702 # * diff_types(nullable A, nullable B) -> A, because null is removed
703 # * diff_types(nullable B, A) -> Null, because anything but null is removed
704 fun diff_types
(node
: ANode, type1
, type2
: nullable MType): nullable MType
706 if type1
== null then return null
707 if type2
== null then return type1
709 # if t1 <: t2 then t1-t2 = bottom
710 if is_subtype
(type1
, type2
) then
711 return modelbuilder
.model
.null_type
.as_notnull
714 # else if t1 <: nullable t2 then t1-t2 = nulltype
715 if is_subtype
(type1
, type2
.as_nullable
) then
716 return modelbuilder
.model
.null_type
719 # else t2 can be null and type2 must accept null then null is excluded in t1
720 if can_be_null
(type1
) and (type2
isa MNullableType or type2
isa MNullType) then
721 return type1
.as_notnull
728 # Mapping between parameters and arguments in a call.
730 # Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
732 # The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
734 # Associate a parameter to an argument
735 var map
= new ArrayMap[Int, Int]
738 # A specific method call site with its associated informations.
744 # The static type of the receiver (possibly unresolved)
747 # The module where the callsite is present
750 # The anchor to use with `recv` or `msignature`
751 var anchor
: nullable MClassType
753 # Is the receiver self?
754 # If "for_self", virtual types of the signature are kept
755 # If "not_for_self", virtual type are erased
756 var recv_is_self
: Bool
758 # The designated method
759 var mproperty
: MMethod
761 # The statically designated method definition
762 # The most specif one, it is.
763 var mpropdef
: MMethodDef
765 # The resolved signature for the receiver
766 var msignature
: MSignature
768 # Is a implicit cast required on erasure typing policy?
769 var erasure_cast
: Bool
771 # The mapping used on the call to associate arguments to parameters
772 # If null then no specific association is required.
773 var signaturemap
: nullable SignatureMap = null
775 private fun check_signature
(v
: TypeVisitor, node
: ANode, args
: Array[AExpr]): Bool
777 var map
= v
.check_signature
(node
, args
, self.mproperty
, self.msignature
)
779 if map
== null then is_broken
= true
783 # Information about the callsite to display on a node
784 fun dump_info
(v
: ASTDump): String do
785 return "{recv}.{mpropdef}{msignature}"
788 redef fun mdoc_or_fallback
do return mproperty
.intro
.mdoc
792 # The declared type of the variable
793 var declared_type
: nullable MType = null is writable
795 # Was the variable type-adapted?
796 # This is used to speedup type retrieval while it remains `false`
797 private var is_adapted
= false
800 redef class FlowContext
801 # Store changes of types because of type evolution
802 private var vars
= new HashMap[Variable, nullable MType]
804 # Adapt the variable to a static type
805 # Warning1: do not modify vars directly.
806 # Warning2: sub-flow may have cached a unadapted variable
807 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
809 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
810 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
811 self.vars
[variable
] = mtype
813 variable
.is_adapted
= true
814 #node.debug "set {variable} to {mtype or else "X"}"
817 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
818 private fun collect_types
(variable
: Variable): Array[nullable MType]
820 #node.debug "flow for {variable}"
821 var res
= new Array[nullable MType]
824 var seen
= new HashSet[FlowContext]
825 while not todo
.is_empty
do
827 if f
.is_unreachable
then continue
828 if seen
.has
(f
) then continue
831 if f
.vars
.has_key
(variable
) then
832 # Found something. Collect it and do not process further on this path
833 res
.add f
.vars
[variable
]
834 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
836 todo
.add_all f
.previous
838 if f
.previous
.is_empty
then
839 # Root flowcontext mean a parameter or something related
840 res
.add variable
.declared_type
841 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
845 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
851 # The entry point of the whole typing analysis
852 fun do_typing
(modelbuilder
: ModelBuilder)
856 # The variable associated to the receiver (if any)
857 var selfvariable
: nullable Variable
860 redef class AMethPropdef
861 redef fun do_typing
(modelbuilder
: ModelBuilder)
863 var mpropdef
= self.mpropdef
864 if mpropdef
== null then return # skip error
866 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
867 self.selfvariable
= v
.selfvariable
869 var mmethoddef
= self.mpropdef
.as(not null)
870 var msignature
= mmethoddef
.msignature
871 if msignature
== null then return # skip error
872 for i
in [0..msignature
.arity
[ do
873 var mtype
= msignature
.mparameters
[i
].mtype
874 if msignature
.vararg_rank
== i
then
875 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
876 if arrayclass
== null then return # Skip error
877 mtype
= arrayclass
.get_mtype
([mtype
])
879 var variable
= self.n_signature
.n_params
[i
].variable
880 assert variable
!= null
881 variable
.declared_type
= mtype
884 var nblock
= self.n_block
885 if nblock
== null then return
890 if not v
.has_loop
or not v
.dirty
then break
893 var post_visitor
= new PostTypingVisitor(v
)
894 post_visitor
.enter_visit
(self)
896 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
897 # We reach the end of the function without having a return, it is bad
898 v
.error
(self, "Error: reached end of function; expected `return` with a value.")
903 private class PostTypingVisitor
905 var type_visitor
: TypeVisitor
906 redef fun visit
(n
) do
908 n
.accept_post_typing
(type_visitor
)
909 if n
isa AExpr and n
.mtype
== null and not n
.is_typed
then
916 private fun accept_post_typing
(v
: TypeVisitor) do end
918 # An additional information message to explain the role of a child expression.
920 # The point of the method is to allow some kind of double dispatch so the parent
921 # choose how to describe its children.
922 private fun bad_expr_message
(child
: AExpr): nullable String do return null
925 redef class AAttrPropdef
926 redef fun do_typing
(modelbuilder
: ModelBuilder)
928 if not has_value
then return
930 var mpropdef
= self.mreadpropdef
931 if mpropdef
== null or mpropdef
.msignature
== null then return # skip error
933 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
934 self.selfvariable
= v
.selfvariable
936 var nexpr
= self.n_expr
937 if nexpr
!= null then
938 var mtype
= self.mtype
939 v
.visit_expr_subtype
(nexpr
, mtype
)
941 var nblock
= self.n_block
942 if nblock
!= null then
944 if not nblock
.after_flow_context
.is_unreachable
then
945 # We reach the end of the init without having a return, it is bad
946 v
.error
(self, "Error: reached end of block; expected `return`.")
955 # The static type of the expression.
956 # null if self is a statement or in case of error
957 var mtype
: nullable MType = null
959 # Is the statement correctly typed?
960 # Used to distinguish errors and statements when `mtype == null`
961 var is_typed
: Bool = false
963 # If required, the following implicit cast `.as(XXX)`
964 # Such a cast may by required after evaluating the expression when
965 # a unsafe operation is detected (silently accepted by the Nit language).
966 # The attribute is computed by `check_subtype`
967 var implicit_cast_to
: nullable MType = null
969 # Return the variable read (if any)
970 # Used to perform adaptive typing
971 fun its_variable
: nullable Variable do return null
973 private fun accept_typing
(v
: TypeVisitor)
975 v
.error
(self, "no implemented accept_typing for {self.class_name}")
978 # Is non-null if `self` is a leaf of a comprehension array construction.
979 # In this case, the enclosing literal array node is designated.
980 # The result of the evaluation of `self` must be
981 # stored inside the designated array (there is an implicit `push`)
982 var comprehension
: nullable AArrayExpr = null
984 # It indicates the number of arguments collected as a vararg.
986 # When 0, the argument is used as is, without transformation.
987 # When 1, the argument is transformed into an singleton array.
988 # Above 1, the arguments and the next ones are transformed into a common array.
990 # This attribute is meaning less on expressions not used as attributes.
991 var vararg_decl
: Int = 0
993 redef fun dump_info
(v
) do
995 var mtype
= self.mtype
996 if mtype
!= null then
997 res
+= v
.yellow
(":{mtype}")
999 var ict
= self.implicit_cast_to
1001 res
+= v
.yellow
("(.as({ict}))")
1007 redef class ABlockExpr
1008 redef fun accept_typing
(v
)
1010 for e
in self.n_expr
do v
.visit_stmt
(e
)
1011 self.is_typed
= true
1014 # The type of a blockexpr is the one of the last expression (or null if empty)
1017 if self.n_expr
.is_empty
then return null
1018 return self.n_expr
.last
.mtype
1022 redef class AVardeclExpr
1023 redef fun accept_typing
(v
)
1025 var variable
= self.variable
1026 if variable
== null then return # Skip error
1028 var ntype
= self.n_type
1029 var mtype
: nullable MType
1030 if ntype
== null then
1033 mtype
= v
.resolve_mtype
(ntype
)
1034 if mtype
== null then return # Skip error
1037 var nexpr
= self.n_expr
1038 if nexpr
!= null then
1039 if mtype
!= null then
1040 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
1041 if etype
== mtype
then
1042 assert ntype
!= null
1043 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
1046 mtype
= v
.visit_expr
(nexpr
)
1047 if mtype
== null then return # Skip error
1051 var decltype
= mtype
1052 if mtype
== null or mtype
isa MNullType then
1053 var objclass
= v
.get_mclass
(self, "Object")
1054 if objclass
== null then return # skip error
1055 decltype
= objclass
.mclass_type
.as_nullable
1056 if mtype
== null then mtype
= decltype
1059 variable
.declared_type
= decltype
1060 v
.set_variable
(self, variable
, mtype
)
1062 #debug("var {variable}: {mtype}")
1065 self.is_typed
= true
1069 redef class AVarExpr
1070 redef fun its_variable
do return self.variable
1071 redef fun accept_typing
(v
)
1073 var variable
= self.variable
1074 if variable
== null then return # Skip error
1076 var mtype
= v
.get_variable
(self, variable
)
1077 if mtype
!= null then
1078 #debug("{variable} is {mtype}")
1080 #debug("{variable} is untyped")
1087 redef class AVarAssignExpr
1088 redef fun accept_typing
(v
)
1090 var variable
= self.variable
1091 assert variable
!= null
1093 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
1095 v
.set_variable
(self, variable
, mtype
)
1097 self.is_typed
= true
1101 redef class AReassignFormExpr
1102 # The method designed by the reassign operator.
1103 var reassign_callsite
: nullable CallSite
1105 var read_type
: nullable MType = null
1107 # Determine the `reassign_property`
1108 # `readtype` is the type of the reading of the left value.
1109 # `writetype` is the type of the writing of the left value.
1110 # (Because of `ACallReassignExpr`, both can be different.
1111 # Return the static type of the value to store.
1112 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
1114 var reassign_name
= self.n_assign_op
.operator
1116 self.read_type
= readtype
1118 var callsite
= v
.get_method
(self.n_assign_op
, readtype
, reassign_name
, false)
1119 if callsite
== null then return null # Skip error
1120 self.reassign_callsite
= callsite
1122 var msignature
= callsite
.msignature
1123 var rettype
= msignature
.return_mtype
1124 assert msignature
.arity
== 1 and rettype
!= null
1126 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
1127 if value_type
== null then return null # Skip error
1129 v
.check_subtype
(self, rettype
, writetype
, false)
1134 redef class AVarReassignExpr
1135 redef fun accept_typing
(v
)
1137 var variable
= self.variable
1138 assert variable
!= null
1140 var readtype
= v
.get_variable
(self, variable
)
1141 if readtype
== null then return
1143 read_type
= readtype
1145 var writetype
= variable
.declared_type
1146 if writetype
== null then return
1148 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
1150 v
.set_variable
(self, variable
, rettype
)
1152 self.is_typed
= rettype
!= null
1157 redef class AContinueExpr
1158 redef fun accept_typing
(v
)
1160 var nexpr
= self.n_expr
1161 if nexpr
!= null then
1164 self.is_typed
= true
1168 redef class ABreakExpr
1169 redef fun accept_typing
(v
)
1171 var nexpr
= self.n_expr
1172 if nexpr
!= null then
1175 self.is_typed
= true
1179 redef class AReturnExpr
1180 redef fun accept_typing
(v
)
1182 var nexpr
= self.n_expr
1184 var mpropdef
= v
.mpropdef
1185 if mpropdef
isa MMethodDef then
1186 ret_type
= mpropdef
.msignature
.return_mtype
1187 else if mpropdef
isa MAttributeDef then
1188 ret_type
= mpropdef
.static_mtype
1192 if nexpr
!= null then
1193 if ret_type
!= null then
1194 v
.visit_expr_subtype
(nexpr
, ret_type
)
1197 v
.error
(nexpr
, "Error: `return` with value in a procedure.")
1200 else if ret_type
!= null then
1201 v
.error
(self, "Error: `return` without value in a function.")
1204 self.is_typed
= true
1208 redef class AAbortExpr
1209 redef fun accept_typing
(v
)
1211 self.is_typed
= true
1216 redef fun accept_typing
(v
)
1218 v
.visit_expr_bool
(n_expr
)
1220 v
.visit_stmt
(n_then
)
1221 v
.visit_stmt
(n_else
)
1223 self.is_typed
= true
1225 if n_then
!= null and n_else
== null then
1226 self.mtype
= n_then
.mtype
1231 redef class AIfexprExpr
1232 redef fun accept_typing
(v
)
1234 v
.visit_expr_bool
(n_expr
)
1236 var t1
= v
.visit_expr
(n_then
)
1237 var t2
= v
.visit_expr
(n_else
)
1239 if t1
== null or t2
== null then
1243 var t
= v
.merge_types
(self, [t1
, t2
])
1245 v
.error
(self, "Type Error: ambiguous type `{t1}` vs `{t2}`.")
1252 redef fun accept_typing
(v
)
1254 v
.visit_stmt
(n_block
)
1255 v
.visit_stmt
(n_catch
)
1256 self.is_typed
= true
1260 redef class AWhileExpr
1261 redef fun accept_typing
(v
)
1264 v
.visit_expr_bool
(n_expr
)
1265 v
.visit_stmt
(n_block
)
1266 self.is_typed
= true
1270 redef class ALoopExpr
1271 redef fun accept_typing
(v
)
1274 v
.visit_stmt
(n_block
)
1275 self.is_typed
= true
1279 redef class AForExpr
1280 redef fun accept_typing
(v
)
1284 for g
in n_groups
do
1285 var mtype
= v
.visit_expr
(g
.n_expr
)
1286 if mtype
== null then return
1287 g
.do_type_iterator
(v
, mtype
)
1288 if g
.is_broken
then is_broken
= true
1291 v
.visit_stmt
(n_block
)
1293 self.mtype
= n_block
.mtype
1294 self.is_typed
= true
1298 redef class AForGroup
1299 var coltype
: nullable MClassType
1301 var method_iterator
: nullable CallSite
1302 var method_is_ok
: nullable CallSite
1303 var method_item
: nullable CallSite
1304 var method_next
: nullable CallSite
1305 var method_key
: nullable CallSite
1306 var method_finish
: nullable CallSite
1308 var method_lt
: nullable CallSite
1309 var method_successor
: nullable CallSite
1311 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1313 if mtype
isa MNullType then
1314 v
.error
(self, "Type Error: `for` cannot iterate over `null`.")
1319 var objcla
= v
.get_mclass
(self, "Object")
1320 if objcla
== null then return
1322 # check iterator method
1323 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1324 if itdef
== null then
1325 v
.error
(self, "Type Error: `for` expects a type providing an `iterator` method, got `{mtype}`.")
1328 self.method_iterator
= itdef
1330 # check that iterator return something
1331 var ittype
= itdef
.msignature
.return_mtype
1332 if ittype
== null then
1333 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1338 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1339 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1343 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1345 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1346 var variables
= self.variables
1347 if variables
.length
!= 1 then
1348 v
.error
(self, "Type Error: `for` expects only one variable when using `Iterator`.")
1350 variables
.first
.declared_type
= coltype
.arguments
.first
1355 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1357 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1358 var variables
= self.variables
1359 if variables
.length
!= 2 then
1360 v
.error
(self, "Type Error: `for` expects two variables when using `MapIterator`.")
1362 variables
[0].declared_type
= coltype
.arguments
[0]
1363 variables
[1].declared_type
= coltype
.arguments
[1]
1368 if not is_col
and not is_map
then
1369 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1373 # anchor formal and virtual types
1374 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1376 mtype
= mtype
.undecorate
1377 self.coltype
= mtype
.as(MClassType)
1379 # get methods is_ok, next, item
1380 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1381 if ikdef
== null then
1382 v
.error
(self, "Type Error: `for` expects a method `is_ok` in type `{ittype}`.")
1385 self.method_is_ok
= ikdef
1387 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1388 if itemdef
== null then
1389 v
.error
(self, "Type Error: `for` expects a method `item` in type `{ittype}`.")
1392 self.method_item
= itemdef
1394 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1395 if nextdef
== null then
1396 v
.error
(self, "Type Error: `for` expects a method `next` in type {ittype}.")
1399 self.method_next
= nextdef
1401 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1404 var keydef
= v
.get_method
(self, ittype
, "key", false)
1405 if keydef
== null then
1406 v
.error
(self, "Type Error: `for` expects a method `key` in type `{ittype}`.")
1409 self.method_key
= keydef
1412 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1413 var variable
= variables
.first
1414 var vtype
= variable
.declared_type
.as(not null)
1416 if n_expr
isa AOrangeExpr then
1417 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1419 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1422 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1427 redef class AWithExpr
1428 var method_start
: nullable CallSite
1429 var method_finish
: nullable CallSite
1431 redef fun accept_typing
(v
: TypeVisitor)
1433 var mtype
= v
.visit_expr
(n_expr
)
1434 if mtype
== null then return
1436 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1437 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1439 v
.visit_stmt
(n_block
)
1440 self.mtype
= n_block
.mtype
1441 self.is_typed
= true
1445 redef class AAssertExpr
1446 redef fun accept_typing
(v
)
1448 v
.visit_expr_bool
(n_expr
)
1450 v
.visit_stmt
(n_else
)
1451 self.is_typed
= true
1456 redef fun accept_typing
(v
)
1458 v
.visit_expr_bool
(n_expr
)
1459 v
.visit_expr_bool
(n_expr2
)
1460 self.mtype
= v
.type_bool
(self)
1464 redef class AImpliesExpr
1465 redef fun accept_typing
(v
)
1467 v
.visit_expr_bool
(n_expr
)
1468 v
.visit_expr_bool
(n_expr2
)
1469 self.mtype
= v
.type_bool
(self)
1473 redef class AAndExpr
1474 redef fun accept_typing
(v
)
1476 v
.visit_expr_bool
(n_expr
)
1477 v
.visit_expr_bool
(n_expr2
)
1478 self.mtype
= v
.type_bool
(self)
1483 redef class ANotExpr
1484 redef fun accept_typing
(v
)
1486 v
.visit_expr_bool
(n_expr
)
1487 self.mtype
= v
.type_bool
(self)
1491 redef class AOrElseExpr
1492 redef fun accept_typing
(v
)
1494 var t1
= v
.visit_expr
(n_expr
)
1495 var t2
= v
.visit_expr
(n_expr2
)
1497 if t1
== null or t2
== null then
1501 if t1
isa MNullType then
1504 else if v
.can_be_null
(t1
) then
1508 var t
= v
.merge_types
(self, [t1
, t2
])
1510 var c
= v
.get_mclass
(self, "Object")
1511 if c
== null then return # forward error
1513 if v
.can_be_null
(t2
) then
1516 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1521 redef fun accept_post_typing
(v
)
1523 var t1
= n_expr
.mtype
1527 v
.check_can_be_null
(n_expr
, t1
)
1532 redef class ATrueExpr
1533 redef fun accept_typing
(v
)
1535 self.mtype
= v
.type_bool
(self)
1539 redef class AFalseExpr
1540 redef fun accept_typing
(v
)
1542 self.mtype
= v
.type_bool
(self)
1546 redef class AIntegerExpr
1547 redef fun accept_typing
(v
)
1549 var mclass
: nullable MClass = null
1550 if value
isa Byte then
1551 mclass
= v
.get_mclass
(self, "Byte")
1552 else if value
isa Int then
1553 mclass
= v
.get_mclass
(self, "Int")
1554 else if value
isa Int8 then
1555 mclass
= v
.get_mclass
(self, "Int8")
1556 else if value
isa Int16 then
1557 mclass
= v
.get_mclass
(self, "Int16")
1558 else if value
isa UInt16 then
1559 mclass
= v
.get_mclass
(self, "UInt16")
1560 else if value
isa Int32 then
1561 mclass
= v
.get_mclass
(self, "Int32")
1562 else if value
isa UInt32 then
1563 mclass
= v
.get_mclass
(self, "UInt32")
1565 if mclass
== null then return # Forward error
1566 self.mtype
= mclass
.mclass_type
1570 redef class AFloatExpr
1571 redef fun accept_typing
(v
)
1573 var mclass
= v
.get_mclass
(self, "Float")
1574 if mclass
== null then return # Forward error
1575 self.mtype
= mclass
.mclass_type
1579 redef class ACharExpr
1580 redef fun accept_typing
(v
) do
1581 var mclass
: nullable MClass = null
1583 mclass
= v
.get_mclass
(self, "Byte")
1584 else if is_code_point
then
1585 mclass
= v
.get_mclass
(self, "Int")
1587 mclass
= v
.get_mclass
(self, "Char")
1589 if mclass
== null then return # Forward error
1590 self.mtype
= mclass
.mclass_type
1594 redef class AugmentedStringFormExpr
1597 # Text::to_re, used for prefix `re`
1598 var to_re
: nullable CallSite = null
1599 # Regex::ignore_case, used for suffix `i` on `re`
1600 var ignore_case
: nullable CallSite = null
1601 # Regex::newline, used for suffix `m` on `re`
1602 var newline
: nullable CallSite = null
1603 # Regex::extended, used for suffix `b` on `re`
1604 var extended
: nullable CallSite = null
1605 # CString::to_bytes_with_copy, used for prefix `b`
1606 var to_bytes_with_copy
: nullable CallSite = null
1608 redef fun accept_typing
(v
) do
1609 var mclass
= v
.get_mclass
(self, "String")
1610 if mclass
== null then return # Forward error
1611 if is_bytestring
then
1612 to_bytes_with_copy
= v
.get_method
(self, v
.mmodule
.c_string_type
, "to_bytes_with_copy", false)
1613 mclass
= v
.get_mclass
(self, "Bytes")
1615 to_re
= v
.get_method
(self, mclass
.mclass_type
, "to_re", false)
1616 for i
in suffix
.chars
do
1617 mclass
= v
.get_mclass
(self, "Regex")
1618 if mclass
== null then
1619 v
.error
(self, "Error: `Regex` class unknown")
1624 service
= "ignore_case="
1625 ignore_case
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1626 else if i
== 'm' then
1627 service
= "newline="
1628 newline
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1629 else if i
== 'b' then
1630 service
= "extended="
1631 extended
= v
.get_method
(self, mclass
.mclass_type
, service
, false)
1633 v
.error
(self, "Type Error: Unrecognized suffix {i} in prefixed Regex")
1638 if mclass
== null then return # Forward error
1639 mtype
= mclass
.mclass_type
1643 redef class ASuperstringExpr
1644 redef fun accept_typing
(v
)
1647 var objclass
= v
.get_mclass
(self, "Object")
1648 if objclass
== null then return # Forward error
1649 var objtype
= objclass
.mclass_type
1650 for nexpr
in self.n_exprs
do
1651 v
.visit_expr_subtype
(nexpr
, objtype
)
1656 redef class AArrayExpr
1657 # The `with_capacity` method on Array
1658 var with_capacity_callsite
: nullable CallSite
1660 # The `push` method on arrays
1661 var push_callsite
: nullable CallSite
1663 # The element of each type
1664 var element_mtype
: nullable MType
1666 # Set that `self` is a part of comprehension array `na`
1667 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1668 private fun set_comprehension
(n
: nullable AExpr)
1672 else if n
isa AForExpr then
1673 set_comprehension
(n
.n_block
)
1674 else if n
isa AIfExpr then
1675 set_comprehension
(n
.n_then
)
1676 set_comprehension
(n
.n_else
)
1679 n
.comprehension
= self
1682 redef fun accept_typing
(v
)
1684 var mtype
: nullable MType = null
1685 var ntype
= self.n_type
1686 if ntype
!= null then
1687 mtype
= v
.resolve_mtype
(ntype
)
1688 if mtype
== null then return # Skip error
1690 var mtypes
= new Array[nullable MType]
1692 for e
in self.n_exprs
do
1693 var t
= v
.visit_expr
(e
)
1697 set_comprehension
(e
)
1698 if mtype
!= null then
1699 if v
.check_subtype
(e
, t
, mtype
, false) == null then return # Forward error
1700 if t
== mtype
then useless
= true
1705 if mtype
== null then
1706 # Ensure monotony for type adaptation on loops
1707 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1708 mtype
= v
.merge_types
(self, mtypes
)
1710 if mtype
== null or mtype
isa MNullType then
1711 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1715 assert ntype
!= null
1716 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1719 self.element_mtype
= mtype
1721 var mclass
= v
.get_mclass
(self, "Array")
1722 if mclass
== null then return # Forward error
1723 var array_mtype
= mclass
.get_mtype
([mtype
])
1725 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1726 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1728 self.mtype
= array_mtype
1732 redef class ARangeExpr
1733 var init_callsite
: nullable CallSite
1735 redef fun accept_typing
(v
)
1737 var discrete_class
= v
.get_mclass
(self, "Discrete")
1738 if discrete_class
== null then return # Forward error
1739 var discrete_type
= discrete_class
.intro
.bound_mtype
1740 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1741 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1742 if t1
== null or t2
== null then return
1743 var mclass
= v
.get_mclass
(self, "Range")
1744 if mclass
== null then return # Forward error
1746 if v
.is_subtype
(t1
, t2
) then
1747 mtype
= mclass
.get_mtype
([t2
])
1748 else if v
.is_subtype
(t2
, t1
) then
1749 mtype
= mclass
.get_mtype
([t1
])
1751 v
.error
(self, "Type Error: cannot create range: `{t1}` vs `{t2}`.")
1757 # get the constructor
1759 if self isa ACrangeExpr then
1760 callsite
= v
.get_method
(self, mtype
, "init", false)
1761 else if self isa AOrangeExpr then
1762 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1766 init_callsite
= callsite
1770 redef class ANullExpr
1771 redef fun accept_typing
(v
)
1773 self.mtype
= v
.mmodule
.model
.null_type
1777 redef class AIsaExpr
1778 # The static type to cast to.
1779 # (different from the static type of the expression that is `Bool`).
1780 var cast_type
: nullable MType
1781 redef fun accept_typing
(v
)
1783 v
.visit_expr
(n_expr
)
1785 var mtype
= v
.resolve_mtype
(n_type
)
1787 self.cast_type
= mtype
1789 var variable
= self.n_expr
.its_variable
1790 if variable
!= null then
1791 var orig
= self.n_expr
.mtype
1792 #var from = if orig != null then orig.to_s else "invalid"
1793 #var to = if mtype != null then mtype.to_s else "invalid"
1794 #debug("adapt {variable}: {from} -> {to}")
1796 var thentype
= v
.intersect_types
(self, orig
, mtype
)
1797 if thentype
!= orig
then
1798 self.after_flow_context
.when_true
.set_var
(v
, variable
, thentype
)
1799 #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> then {thentype or else "?"}"
1802 var elsetype
= v
.diff_types
(self, orig
, mtype
)
1803 if elsetype
!= orig
then
1804 self.after_flow_context
.when_false
.set_var
(v
, variable
, elsetype
)
1805 #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> else {elsetype or else "?"}"
1809 self.mtype
= v
.type_bool
(self)
1812 redef fun accept_post_typing
(v
)
1814 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1817 redef fun dump_info
(v
) do
1819 var mtype
= self.cast_type
1820 if mtype
!= null then
1821 res
+= v
.yellow
(".as({mtype})")
1828 redef class AAsCastExpr
1829 redef fun accept_typing
(v
)
1831 v
.visit_expr
(n_expr
)
1833 self.mtype
= v
.resolve_mtype
(n_type
)
1836 redef fun accept_post_typing
(v
)
1838 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1842 redef class AAsNotnullExpr
1843 redef fun accept_typing
(v
)
1845 var mtype
= v
.visit_expr
(self.n_expr
)
1846 if mtype
== null then return # Forward error
1848 if mtype
isa MNullType then
1849 v
.error
(self, "Type Error: `as(not null)` on `null`.")
1853 if v
.can_be_null
(mtype
) then
1854 mtype
= mtype
.as_notnull
1860 redef fun accept_post_typing
(v
)
1862 var mtype
= n_expr
.mtype
1863 if mtype
== null then return
1864 v
.check_can_be_null
(n_expr
, mtype
)
1868 redef class AParExpr
1869 redef fun accept_typing
(v
)
1871 self.mtype
= v
.visit_expr
(self.n_expr
)
1875 redef class AOnceExpr
1876 redef fun accept_typing
(v
)
1878 self.mtype
= v
.visit_expr
(self.n_expr
)
1882 redef class ASelfExpr
1883 redef var its_variable
: nullable Variable
1884 redef fun accept_typing
(v
)
1886 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1887 v
.error
(self, "Error: `self` cannot be used in top-level method.")
1889 var variable
= v
.selfvariable
1890 self.its_variable
= variable
1891 self.mtype
= v
.get_variable
(self, variable
)
1895 redef class AImplicitSelfExpr
1896 # Is the implicit receiver `sys`?
1898 # By default, the implicit receiver is `self`.
1899 # But when there is not method for `self`, `sys` is used as a fall-back.
1900 # Is this case this flag is set to `true`.
1904 ## MESSAGE SENDING AND PROPERTY
1906 redef class ASendExpr
1907 # The property invoked by the send.
1908 var callsite
: nullable CallSite
1910 redef fun bad_expr_message
(child
)
1912 if child
== self.n_expr
then
1913 return "to be the receiver of `{self.property_name}`"
1918 redef fun accept_typing
(v
)
1920 var nrecv
= self.n_expr
1921 var recvtype
= v
.visit_expr
(nrecv
)
1922 var name
= self.property_name
1923 var node
= self.property_node
1925 if recvtype
== null then return # Forward error
1928 var unsafe_type
= v
.anchor_to
(recvtype
)
1929 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1930 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1931 # Special fall-back search in `sys` when noting found in the implicit receiver.
1932 var sysclass
= v
.try_get_mclass
(node
, "Sys")
1933 if sysclass
!= null then
1934 var systype
= sysclass
.mclass_type
1935 mproperty
= v
.try_get_mproperty_by_name2
(node
, systype
, name
)
1936 if mproperty
!= null then
1937 callsite
= v
.get_method
(node
, systype
, name
, false)
1938 if callsite
== null then return # Forward error
1939 # Update information, we are looking at `sys` now, not `self`
1941 nrecv
.its_variable
= null
1942 nrecv
.mtype
= systype
1947 if callsite
== null then
1948 # If still nothing, just exit
1949 callsite
= v
.get_method
(node
, recvtype
, name
, nrecv
isa ASelfExpr)
1950 if callsite
== null then return
1953 self.callsite
= callsite
1954 var msignature
= callsite
.msignature
1956 var args
= compute_raw_arguments
1958 callsite
.check_signature
(v
, node
, args
)
1960 if callsite
.mproperty
.is_init
then
1961 var vmpropdef
= v
.mpropdef
1962 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1963 v
.error
(node
, "Error: an `init` can only be called from another `init`.")
1965 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1966 v
.error
(node
, "Error: `{vmpropdef}` cannot call a factory `{callsite.mproperty}`.")
1970 var ret
= msignature
.return_mtype
1974 self.is_typed
= true
1978 # The name of the property
1979 # Each subclass simply provide the correct name.
1980 private fun property_name
: String is abstract
1982 # The node identifying the name (id, operator, etc) for messages.
1984 # Is `self` by default
1985 private fun property_node
: ANode do return self
1987 # An array of all arguments (excluding self)
1988 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1990 private fun compute_raw_arguments
: Array[AExpr] is abstract
1992 redef fun dump_info
(v
) do
1994 var callsite
= self.callsite
1995 if callsite
!= null then
1996 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
2002 redef class ABinopExpr
2003 redef fun compute_raw_arguments
do return [n_expr2
]
2004 redef fun property_name
do return operator
2005 redef fun property_node
do return n_op
2008 redef class AEqFormExpr
2009 redef fun accept_typing
(v
)
2015 redef fun accept_post_typing
(v
)
2017 var mtype
= n_expr
.mtype
2018 var mtype2
= n_expr2
.mtype
2020 if mtype
== null or mtype2
== null then return
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 assert anchor
!= null
2145 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2146 assert recvtype
!= null
2147 var mproperty
= v
.mpropdef
.mproperty
2148 if not mproperty
isa MMethod then
2149 v
.error
(self, "Error: `super` only usable in a `method`.")
2152 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
2153 if superprops
.length
== 0 then
2154 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
2155 process_superinit
(v
)
2158 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2161 # FIXME: covariance of return type in linear extension?
2162 var superprop
= superprops
.first
2164 var msignature
= superprop
.msignature
.as(not null)
2165 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2166 var args
= self.n_args
.to_a
2167 if args
.length
> 0 then
2168 signaturemap
= v
.check_signature
(self, args
, mproperty
, msignature
)
2170 self.mtype
= msignature
.return_mtype
2171 self.is_typed
= true
2172 v
.mpropdef
.has_supercall
= true
2173 mpropdef
= v
.mpropdef
.as(MMethodDef)
2176 # The mapping used on the call to associate arguments to parameters.
2177 # If null then no specific association is required.
2178 var signaturemap
: nullable SignatureMap
2180 private fun process_superinit
(v
: TypeVisitor)
2182 var anchor
= v
.anchor
2183 assert anchor
!= null
2184 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
2185 assert recvtype
!= null
2186 var mpropdef
= v
.mpropdef
2187 assert mpropdef
isa MMethodDef
2188 var mproperty
= mpropdef
.mproperty
2189 var superprop
: nullable MMethodDef = null
2190 for msupertype
in mpropdef
.mclassdef
.supertypes
do
2191 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
2192 var errcount
= v
.modelbuilder
.toolcontext
.error_count
2193 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
2194 if candidate
== null then
2195 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
2196 continue # Try next super-class
2198 if superprop
!= null and candidate
.is_root_init
then
2201 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
2202 v
.error
(self, "Error: conflicting super constructor to call for `{mproperty}`: `{candidate.full_name}`, `{superprop.mproperty.full_name}`")
2205 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
2206 if superprop
!= null and superprop
.mproperty
== candidate
then
2207 if superprop
== candidatedefs
.first
then continue
2208 candidatedefs
.add
(superprop
)
2210 if candidatedefs
.length
> 1 then
2211 v
.error
(self, "Error: conflicting property definitions for property `{mproperty}` in `{recvtype}`: {candidatedefs.join(", ")}")
2214 superprop
= candidatedefs
.first
2216 if superprop
== null then
2217 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2221 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
2222 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2224 var callsite
= new CallSite(hot_location
, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
2225 self.callsite
= callsite
2227 var args
= self.n_args
.to_a
2228 if args
.length
> 0 then
2229 callsite
.check_signature
(v
, self, args
)
2231 # Check there is at least enough parameters
2232 if mpropdef
.msignature
.arity
< msignature
.arity
then
2233 v
.error
(self, "Error: not enough implicit arguments to pass. Got `{mpropdef.msignature.arity}`, expected at least `{msignature.arity}`. Signature is `{msignature}`.")
2236 # Check that each needed parameter is conform
2238 for sp
in msignature
.mparameters
do
2239 var p
= mpropdef
.msignature
.mparameters
[i
]
2240 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
2241 v
.error
(self, "Type Error: expected argument #{i} of type `{sp.mtype}`, got implicit argument `{p.name}` of type `{p.mtype}`. Signature is {msignature}")
2248 self.is_typed
= true
2251 redef fun dump_info
(v
) do
2253 var callsite
= self.callsite
2254 if callsite
!= null then
2255 res
+= v
.yellow
(" super-init="+callsite
.dump_info
(v
))
2257 var mpropdef
= self.mpropdef
2258 if mpropdef
!= null then
2259 res
+= v
.yellow
(" call-next-method="+mpropdef
.to_s
)
2267 redef class ANewExpr
2268 # The constructor invoked by the new.
2269 var callsite
: nullable CallSite
2271 # The designated type
2272 var recvtype
: nullable MClassType
2274 redef fun accept_typing
(v
)
2276 var recvtype
= v
.resolve_mtype
(self.n_type
)
2277 if recvtype
== null then return
2279 if not recvtype
isa MClassType then
2280 if recvtype
isa MNullableType then
2281 v
.error
(self, "Type Error: cannot instantiate the nullable type `{recvtype}`.")
2283 else if recvtype
isa MFormalType then
2284 v
.error
(self, "Type Error: cannot instantiate the formal type `{recvtype}`.")
2287 v
.error
(self, "Type Error: cannot instantiate the type `{recvtype}`.")
2292 self.recvtype
= recvtype
2293 var kind
= recvtype
.mclass
.kind
2296 var nqid
= self.n_qid
2298 if nqid
!= null then
2299 name
= nqid
.n_id
.text
2305 if name
== "intern" then
2306 if kind
!= concrete_kind
then
2307 v
.error
(self, "Type Error: cannot instantiate {kind} {recvtype}.")
2310 if n_args
.n_exprs
.not_empty
then
2311 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
2315 self.mtype
= recvtype
2319 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
2320 if callsite
== null then return
2322 if not callsite
.mproperty
.is_new
then
2323 if kind
!= concrete_kind
then
2324 v
.error
(self, "Type Error: cannot instantiate {kind} `{recvtype}`.")
2327 self.mtype
= recvtype
2329 self.mtype
= callsite
.msignature
.return_mtype
2330 assert self.mtype
!= null
2333 self.callsite
= callsite
2335 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
2336 v
.error
(self, "Error: `{name}` is not a constructor.")
2340 var args
= n_args
.to_a
2341 callsite
.check_signature
(v
, node
, args
)
2344 redef fun dump_info
(v
) do
2346 var callsite
= self.callsite
2347 if callsite
!= null then
2348 res
+= v
.yellow
(" call="+callsite
.dump_info
(v
))
2356 redef class AAttrFormExpr
2357 # The attribute accessed.
2358 var mproperty
: nullable MAttribute
2360 # The static type of the attribute.
2361 var attr_type
: nullable MType
2363 # Resolve the attribute accessed.
2364 private fun resolve_property
(v
: TypeVisitor)
2366 var recvtype
= v
.visit_expr
(self.n_expr
)
2367 if recvtype
== null then return # Skip error
2368 var node
= self.n_id
2369 var name
= node
.text
2370 if recvtype
isa MNullType then
2371 v
.error
(node
, "Error: attribute `{name}` access on `null`.")
2375 var unsafe_type
= v
.anchor_to
(recvtype
)
2376 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
2377 if mproperty
== null then
2378 v
.modelbuilder
.error
(node
, "Error: attribute `{name}` does not exist in `{recvtype}`.")
2381 assert mproperty
isa MAttribute
2382 self.mproperty
= mproperty
2384 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
2385 assert mpropdefs
.length
== 1
2386 var mpropdef
= mpropdefs
.first
2387 var attr_type
= mpropdef
.static_mtype
2388 if attr_type
== null then return # skip error
2389 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
2390 self.attr_type
= attr_type
2393 redef fun dump_info
(v
) do
2395 var mproperty
= self.mproperty
2396 var attr_type
= self.attr_type
2397 if mproperty
!= null then
2398 res
+= v
.yellow
(" attr={mproperty}:{attr_type or else "BROKEN"}")
2404 redef class AAttrExpr
2405 redef fun accept_typing
(v
)
2407 self.resolve_property
(v
)
2408 self.mtype
= self.attr_type
2413 redef class AAttrAssignExpr
2414 redef fun accept_typing
(v
)
2416 self.resolve_property
(v
)
2417 var mtype
= self.attr_type
2419 v
.visit_expr_subtype
(self.n_value
, mtype
)
2420 self.is_typed
= mtype
!= null
2424 redef class AAttrReassignExpr
2425 redef fun accept_typing
(v
)
2427 self.resolve_property
(v
)
2428 var mtype
= self.attr_type
2429 if mtype
== null then return # Skip error
2431 var rettype
= self.resolve_reassignment
(v
, mtype
, mtype
)
2433 self.is_typed
= rettype
!= null
2437 redef class AIssetAttrExpr
2438 redef fun accept_typing
(v
)
2440 self.resolve_property
(v
)
2441 var mtype
= self.attr_type
2442 if mtype
== null then return # Skip error
2444 var recvtype
= self.n_expr
.mtype
.as(not null)
2445 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2446 if bound
isa MNullableType then
2447 v
.error
(n_id
, "Type Error: `isset` on a nullable attribute.")
2449 self.mtype
= v
.type_bool
(self)
2453 redef class AVarargExpr
2454 redef fun accept_typing
(v
)
2456 # This kind of pseudo-expression can be only processed trough a signature
2457 # See `check_signature`
2458 # Other cases are a syntax error.
2459 v
.error
(self, "Syntax Error: unexpected `...`.")
2465 redef class ADebugTypeExpr
2466 redef fun accept_typing
(v
)
2468 var expr
= v
.visit_expr
(self.n_expr
)
2469 if expr
== null then return
2470 var unsafe
= v
.anchor_to
(expr
)
2471 var ntype
= self.n_type
2472 var mtype
= v
.resolve_mtype
(ntype
)
2473 if mtype
!= null and mtype
!= expr
then
2474 var umtype
= v
.anchor_to
(mtype
)
2475 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2477 self.is_typed
= true