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.
22 import modelize_property
26 redef class ToolContext
27 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
30 private class TypingPhase
32 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
35 private class TypeVisitor
36 var modelbuilder
: ModelBuilder
37 var nclassdef
: AClassdef
38 var mpropdef
: MPropDef
40 var selfvariable
: Variable = new Variable("self")
42 init(modelbuilder
: ModelBuilder, nclassdef
: AClassdef, mpropdef
: MPropDef)
44 self.modelbuilder
= modelbuilder
45 self.nclassdef
= nclassdef
46 self.mpropdef
= mpropdef
48 var mclass
= nclassdef
.mclassdef
.mclass
50 var selfvariable
= new Variable("self")
51 self.selfvariable
= selfvariable
52 selfvariable
.declared_type
= mclass
.mclass_type
55 fun mmodule
: MModule do return self.nclassdef
.mclassdef
.mmodule
57 fun anchor
: MClassType do return self.nclassdef
.mclassdef
.bound_mtype
59 fun anchor_to
(mtype
: MType): MType
61 var mmodule
= self.nclassdef
.mclassdef
.mmodule
62 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
63 return mtype
.anchor_to
(mmodule
, anchor
)
66 fun is_subtype
(sub
, sup
: MType): Bool
68 var mmodule
= self.nclassdef
.mclassdef
.mmodule
69 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
70 return sub
.is_subtype
(mmodule
, anchor
, sup
)
73 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
75 var mmodule
= self.nclassdef
.mclassdef
.mmodule
76 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
77 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
78 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
82 # Retrieve the signature of a `MMethodDef` resolved for a specific call.
83 # This method is an helper to symplify the query on the model.
85 # Note: `for_self` indicates if the reciever is self or not.
86 # If yes, virtual types are not resolved.
87 fun resolve_signature_for
(mmethoddef
: MMethodDef, recv
: MType, for_self
: Bool): MSignature
89 return self.resolve_for
(mmethoddef
.msignature
.as(not null), recv
, for_self
).as(MSignature)
92 # Check that `sub` is a subtype of `sup`.
93 # If `sub` is not a valud suptype, then display an error on `node` an return null.
94 # If `sub` is a safe subtype of `sup` then return `sub`.
95 # If `sub` is an insafe subtype (ie an imlicit cast is required), then return `sup`.
97 # The point of the return type is to determinate the usable type on an expression:
98 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
99 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
100 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
102 if self.is_subtype
(sub
, sup
) then return sub
103 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
104 # FIXME workarround to the current unsafe typing policy. To remove once fixed virtual types exists.
105 #node.debug("Unsafe typing: expected {sup}, got {sub}")
108 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
112 # Visit an expression and do not care about the return value
113 fun visit_stmt
(nexpr
: nullable AExpr)
115 if nexpr
== null then return
116 nexpr
.accept_typing
(self)
119 # Visit an expression and expects that it is not a statement
120 # Return the type of the expression
121 # Display an error and return null if:
122 # * the type cannot be determined or
123 # * `nexpr` is a statement
124 fun visit_expr
(nexpr
: AExpr): nullable MType
126 nexpr
.accept_typing
(self)
127 var mtype
= nexpr
.mtype
128 if mtype
!= null then return mtype
129 if not nexpr
.is_typed
then
130 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
131 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
132 nexpr
.debug
("No return type but no error.")
135 return null # forward error
137 self.error
(nexpr
, "Type error: expected expression.")
141 # Visit an expression and expect its static type is a least a `sup`
142 # Return the type of the expression or null if
143 # * the type cannot be determined or
144 # * `nexpr` is a statement or
145 # * `nexpr` is not a `sup`
146 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
148 var sub
= visit_expr
(nexpr
)
149 if sub
== null then return null # Forward error
151 if sup
== null then return null # Forward error
153 var res
= check_subtype
(nexpr
, sub
, sup
)
155 nexpr
.implicit_cast_to
= res
160 # Visit an expression and expect its static type is a `Bool`
161 # Return the type of the expression or null if
162 # * the type cannot be determined or
163 # * `nexpr` is a statement or
164 # * `nexpr` is not a `Bool`
165 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
167 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
171 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
173 var sub
= visit_expr
(nexpr
)
174 if sub
== null then return null # Forward error
176 var sup
= self.resolve_mtype
(ntype
)
177 if sup
== null then return null # Forward error
179 var mmodule
= self.nclassdef
.mclassdef
.mmodule
180 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
182 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup}.")
183 else if self.is_subtype
(sub
, sup
) and not sup
.need_anchor
then
184 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup} since it is a {sub}.")
189 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
191 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, self.nclassdef
.mclassdef
.mmodule
, mtype
, name
)
194 fun resolve_mtype
(node
: AType): nullable MType
196 return self.modelbuilder
.resolve_mtype
(self.nclassdef
, node
)
199 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
201 var mmodule
= self.nclassdef
.mclassdef
.mmodule
202 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
206 fun get_mclass
(node
: ANode, name
: String): nullable MClass
208 var mmodule
= self.nclassdef
.mclassdef
.mmodule
209 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
210 if mclass
== null then
211 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
216 fun type_bool
(node
: ANode): nullable MType
218 var mclass
= self.get_mclass
(node
, "Bool")
219 if mclass
== null then return null
220 return mclass
.mclass_type
223 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
225 var unsafe_type
= self.anchor_to
(recvtype
)
227 #debug("recv: {recvtype} (aka {unsafe_type})")
228 if recvtype
isa MNullType then
229 self.error
(node
, "Error: Method '{name}' call on 'null'.")
233 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
234 if mproperty
== null then
235 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
237 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
239 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
244 assert mproperty
isa MMethod
245 if mproperty
.visibility
== protected_visibility
and not recv_is_self
and self.mmodule
.visibility_for
(mproperty
.intro_mclassdef
.mmodule
) < intrude_visibility
then
246 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self. {mproperty.intro_mclassdef.mmodule.visibility_for(self.mmodule)}")
250 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
252 if propdefs
.length
== 0 then
253 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
255 else if propdefs
.length
== 1 then
256 mpropdef
= propdefs
.first
258 self.modelbuilder
.warning
(node
, "Warning: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
259 mpropdef
= mproperty
.intro
263 var msignature
= self.resolve_signature_for
(mpropdef
, recvtype
, recv_is_self
)
265 var erasure_cast
= false
266 var rettype
= mpropdef
.msignature
.return_mtype
267 if not recv_is_self
and rettype
!= null then
268 if rettype
isa MNullableType then rettype
= rettype
.mtype
269 if rettype
isa MParameterType then
270 var erased_rettype
= msignature
.return_mtype
271 assert erased_rettype
!= null
272 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
277 var callsite
= new CallSite(node
, recvtype
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
281 # Visit the expressions of args and cheik their conformity with the corresponding typi in signature
282 # The point of this method is to handle varargs correctly
283 # Note: The signature must be correctly adapted
284 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
286 var vararg_rank
= msignature
.vararg_rank
287 if vararg_rank
>= 0 then
288 if args
.length
< msignature
.arity
then
289 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
290 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
293 else if args
.length
!= msignature
.arity
then
294 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
298 #debug("CALL {unsafe_type}.{msignature}")
300 var vararg_decl
= args
.length
- msignature
.arity
301 for i
in [0..msignature
.arity
[ do
303 if i
== vararg_rank
then continue # skip the vararg
304 if i
> vararg_rank
then
307 var paramtype
= msignature
.mparameters
[i
].mtype
308 self.visit_expr_subtype
(args
[j
], paramtype
)
310 if vararg_rank
>= 0 then
311 var varargs
= new Array[AExpr]
312 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
313 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
315 self.visit_expr_subtype
(args
[j
], paramtype
)
321 fun error
(node
: ANode, message
: String)
323 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
326 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
328 var flow
= node
.after_flow_context
330 self.error
(node
, "No context!")
334 if flow
.vars
.has_key
(variable
) then
335 return flow
.vars
[variable
]
337 #node.debug("*** START Collected for {variable}")
338 var mtypes
= flow
.collect_types
(variable
)
339 #node.debug("**** END Collected for {variable}")
340 if mtypes
== null or mtypes
.length
== 0 then
341 return variable
.declared_type
342 else if mtypes
.length
== 1 then
345 var res
= merge_types
(node
,mtypes
)
346 if res
== null then res
= variable
.declared_type
352 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
354 var flow
= node
.after_flow_context
357 flow
.set_var
(variable
, mtype
)
360 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
362 if col
.length
== 1 then return col
.first
363 var res
= new Array[nullable MType]
365 if t1
== null then continue # return null
368 if t2
== null then continue # return null
369 if t2
isa MNullableType or t2
isa MNullType then
372 if not is_subtype
(t2
, t1
) then found
= false
375 #print "merge {col.join(" ")} -> {t1}"
379 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
384 # A specific method call site with its associated informations.
386 # The assiciated node for location
389 # The statis type of the receiver
392 # Is the receiver self?
393 # If "for_self", virtual types of the signature are keeped
394 # If "not_for_self", virtual type are erased
395 var recv_is_self
: Bool
397 # The designated method
398 var mproperty
: MMethod
400 # The statically designated method definition
401 # The most specif one, it is.
402 var mpropdef
: MMethodDef
404 # The resolved signature for the receiver
405 var msignature
: MSignature
407 # Is a implicit cast required on erasure typing policy?
408 var erasure_cast
: Bool
410 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
412 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
417 # The declared type of the variable
418 var declared_type
: nullable MType
421 redef class FlowContext
422 # Store changes of types because of type evolution
423 private var vars
: HashMap[Variable, nullable MType] = new HashMap[Variable, nullable MType]
424 private var cache
: HashMap[Variable, nullable Array[nullable MType]] = new HashMap[Variable, nullable Array[nullable MType]]
426 # Adapt the variable to a static type
427 # Warning1: do not modify vars directly.
428 # Warning2: sub-flow may have cached a unadapted variabial
429 private fun set_var
(variable
: Variable, mtype
: nullable MType)
431 self.vars
[variable
] = mtype
432 self.cache
.keys
.remove
(variable
)
435 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
437 if cache
.has_key
(variable
) then
438 return cache
[variable
]
440 var res
: nullable Array[nullable MType] = null
441 if vars
.has_key
(variable
) then
442 var mtype
= vars
[variable
]
444 else if self.previous
.is_empty
then
446 res
= [variable
.declared_type
]
448 for flow
in self.previous
do
449 if flow
.is_unreachable
then continue
450 var r2
= flow
.collect_types
(variable
)
451 if r2
== null then continue
456 if not res
.has
(t
) then res
.add
(t
)
461 cache
[variable
] = res
467 # The entry point of the whole typing analysis
468 fun do_typing
(modelbuilder
: ModelBuilder)
472 # The variable associated to the reciever (if any)
473 var selfvariable
: nullable Variable
476 redef class AConcreteMethPropdef
477 redef fun do_typing
(modelbuilder
: ModelBuilder)
479 var nclassdef
= self.parent
.as(AClassdef)
480 var mpropdef
= self.mpropdef
.as(not null)
481 var v
= new TypeVisitor(modelbuilder
, nclassdef
, mpropdef
)
482 self.selfvariable
= v
.selfvariable
484 var nblock
= self.n_block
485 if nblock
== null then return
487 var mmethoddef
= self.mpropdef
.as(not null)
488 for i
in [0..mmethoddef
.msignature
.arity
[ do
489 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
490 if mmethoddef
.msignature
.vararg_rank
== i
then
491 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
492 if arrayclass
== null then return # Skip error
493 mtype
= arrayclass
.get_mtype
([mtype
])
495 var variable
= self.n_signature
.n_params
[i
].variable
496 assert variable
!= null
497 variable
.declared_type
= mtype
499 for i
in [0..mmethoddef
.msignature
.mclosures
.length
[ do
500 var mclosure
= mmethoddef
.msignature
.mclosures
[i
]
501 var variable
= self.n_signature
.n_closure_decls
[i
].variable
502 assert variable
!= null
503 variable
.declared_type
= mclosure
.mtype
507 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
508 # We reach the end of the function without having a return, it is bad
509 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
514 redef class AAttrPropdef
515 redef fun do_typing
(modelbuilder
: ModelBuilder)
517 var nclassdef
= self.parent
.as(AClassdef)
518 var v
= new TypeVisitor(modelbuilder
, nclassdef
, self.mpropdef
.as(not null))
519 self.selfvariable
= v
.selfvariable
521 var nexpr
= self.n_expr
522 if nexpr
!= null then
523 var mtype
= self.mpropdef
.static_mtype
524 v
.visit_expr_subtype
(nexpr
, mtype
)
532 # The static type of the expression.
533 # null if self is a statement of in case of error
534 var mtype
: nullable MType = null
536 # Is the statement correctly typed?
537 # Used to distinguish errors and statements when `mtype == null`
538 var is_typed
: Bool = false
540 # If required, the following implicit cast `.as(XXX)`
541 # Such a cast may by required after evaluating the expression when
542 # a unsafe operation is detected (silently accepted by the Nit language).
543 # The attribute is computed by `check_subtype`
544 var implicit_cast_to
: nullable MType = null
546 # Return the variable read (if any)
547 # Used to perform adaptive typing
548 fun its_variable
: nullable Variable do return null
550 private fun accept_typing
(v
: TypeVisitor)
552 v
.error
(self, "no implemented accept_typing for {self.class_name}")
556 redef class ABlockExpr
557 redef fun accept_typing
(v
)
559 for e
in self.n_expr
do v
.visit_stmt
(e
)
563 # The type of a blockexpr is the one of the last expression (or null if empty)
566 if self.n_expr
.is_empty
then return null
567 return self.n_expr
.last
.mtype
571 redef class AVardeclExpr
572 redef fun accept_typing
(v
)
574 var variable
= self.variable
575 if variable
== null then return # Skip error
577 var ntype
= self.n_type
578 var mtype
: nullable MType
579 if ntype
== null then
582 mtype
= v
.resolve_mtype
(ntype
)
583 if mtype
== null then return # Skip error
586 var nexpr
= self.n_expr
587 if nexpr
!= null then
588 if mtype
!= null then
589 v
.visit_expr_subtype
(nexpr
, mtype
)
591 mtype
= v
.visit_expr
(nexpr
)
592 if mtype
== null then return # Skip error
597 if mtype
== null or mtype
isa MNullType then
598 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
599 if mtype
== null then mtype
= decltype
602 variable
.declared_type
= decltype
603 v
.set_variable
(self, variable
, mtype
)
605 #debug("var {variable}: {mtype}")
612 redef fun its_variable
do return self.variable
613 redef fun accept_typing
(v
)
615 var variable
= self.variable
616 if variable
== null then return # Skip error
618 var mtype
= v
.get_variable
(self, variable
)
619 if mtype
!= null then
620 #debug("{variable} is {mtype}")
622 #debug("{variable} is untyped")
629 redef class AVarAssignExpr
630 redef fun accept_typing
(v
)
632 var variable
= self.variable
633 assert variable
!= null
635 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
637 v
.set_variable
(self, variable
, mtype
)
643 redef class AReassignFormExpr
644 # @depreciated use `reassign_callsite`
645 fun reassign_property
: nullable MMethodDef do return self.reassign_callsite
.mpropdef
647 # The method designed by the reassign operator.
648 var reassign_callsite
: nullable CallSite
650 var read_type
: nullable MType = null
652 # Determine the `reassign_property`
653 # `readtype` is the type of the reading of the left value.
654 # `writetype` is the type of the writing of the left value.
655 # (Because of `ACallReassignExpr`, both can be different.
656 # Return the static type of the value to store.
657 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
659 var reassign_name
: String
660 if self.n_assign_op
isa APlusAssignOp then
662 else if self.n_assign_op
isa AMinusAssignOp then
668 self.read_type
= readtype
670 if readtype
isa MNullType then
671 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
675 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
676 if callsite
== null then return null # Skip error
677 self.reassign_callsite
= callsite
679 var msignature
= callsite
.msignature
680 var rettype
= msignature
.return_mtype
681 assert msignature
.arity
== 1 and rettype
!= null
683 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
684 if value_type
== null then return null # Skip error
686 v
.check_subtype
(self, rettype
, writetype
)
691 redef class AVarReassignExpr
692 redef fun accept_typing
(v
)
694 var variable
= self.variable
695 assert variable
!= null
697 var readtype
= v
.get_variable
(self, variable
)
698 if readtype
== null then return
700 var writetype
= variable
.declared_type
701 if writetype
== null then return
703 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
705 v
.set_variable
(self, variable
, rettype
)
712 redef class AContinueExpr
713 redef fun accept_typing
(v
)
715 var nexpr
= self.n_expr
716 if nexpr
!= null then
717 var mtype
= v
.visit_expr
(nexpr
)
723 redef class ABreakExpr
724 redef fun accept_typing
(v
)
726 var nexpr
= self.n_expr
727 if nexpr
!= null then
728 var mtype
= v
.visit_expr
(nexpr
)
734 redef class AReturnExpr
735 redef fun accept_typing
(v
)
737 var nexpr
= self.n_expr
738 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
739 if nexpr
!= null then
740 if ret_type
!= null then
741 var mtype
= v
.visit_expr_subtype
(nexpr
, ret_type
)
743 var mtype
= v
.visit_expr
(nexpr
)
744 v
.error
(self, "Error: Return with value in a procedure.")
746 else if ret_type
!= null then
747 v
.error
(self, "Error: Return without value in a function.")
753 redef class AAbortExpr
754 redef fun accept_typing
(v
)
761 redef fun accept_typing
(v
)
763 v
.visit_expr_bool
(n_expr
)
771 redef class AIfexprExpr
772 redef fun accept_typing
(v
)
774 v
.visit_expr_bool
(n_expr
)
776 var t1
= v
.visit_expr
(n_then
)
777 var t2
= v
.visit_expr
(n_else
)
779 if t1
== null or t2
== null then
783 var t
= v
.merge_types
(self, [t1
, t2
])
785 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
792 redef fun accept_typing
(v
)
794 v
.visit_stmt
(n_block
)
799 redef class AWhileExpr
800 redef fun accept_typing
(v
)
802 v
.visit_expr_bool
(n_expr
)
804 v
.visit_stmt
(n_block
)
809 redef class ALoopExpr
810 redef fun accept_typing
(v
)
812 v
.visit_stmt
(n_block
)
818 var coltype
: nullable MClassType
820 var method_iterator
: nullable MMethod
821 var method_is_ok
: nullable MMethod
822 var method_item
: nullable MMethod
823 var method_next
: nullable MMethod
824 var method_key
: nullable MMethod
826 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
828 var objcla
= v
.get_mclass
(self, "Object")
829 if objcla
== null then return
834 var colcla
= v
.try_get_mclass
(self, "Collection")
835 if colcla
!= null and v
.is_subtype
(mtype
, colcla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
836 var coltype
= mtype
.supertype_to
(v
.mmodule
, v
.anchor
, colcla
)
837 self.coltype
= coltype
838 var variables
= self.variables
839 if variables
.length
!= 1 then
840 v
.error
(self, "Type Error: Expected one variable")
842 variables
.first
.declared_type
= coltype
.arguments
.first
847 var mapcla
= v
.try_get_mclass
(self, "Map")
848 if mapcla
!= null and v
.is_subtype
(mtype
, mapcla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
849 var coltype
= mtype
.supertype_to
(v
.mmodule
, v
.anchor
, mapcla
)
850 self.coltype
= coltype
851 var variables
= self.variables
852 if variables
.length
!= 2 then
853 v
.error
(self, "Type Error: Expected two variables")
855 variables
[0].declared_type
= coltype
.arguments
[0]
856 variables
[1].declared_type
= coltype
.arguments
[1]
861 if is_col
or is_map
then
862 # get iterator method
863 var coltype
= self.coltype
.as(not null)
864 var itdef
= v
.get_method
(self, coltype
, "iterator", true)
865 if itdef
== null then
866 v
.error
(self, "Type Error: Expected method 'iterator' in type {coltype}")
869 self.method_iterator
= itdef
.mproperty
872 var ittype
= itdef
.msignature
.return_mtype
873 if ittype
== null then
874 v
.error
(self, "Type Error: Expected method 'iterator' to return an Iterator type")
878 # get methods is_ok, next, item
879 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
880 if ikdef
== null then
881 v
.error
(self, "Type Error: Expected method 'is_ok' in Iterator type {ittype}")
884 self.method_is_ok
= ikdef
.mproperty
886 var itemdef
= v
.get_method
(self, ittype
, "item", false)
887 if itemdef
== null then
888 v
.error
(self, "Type Error: Expected method 'item' in Iterator type {ittype}")
891 self.method_item
= itemdef
.mproperty
893 var nextdef
= v
.get_method
(self, ittype
, "next", false)
894 if nextdef
== null then
895 v
.error
(self, "Type Error: Expected method 'next' in Iterator type {ittype}")
898 self.method_next
= nextdef
.mproperty
901 var keydef
= v
.get_method
(self, ittype
, "key", false)
902 if keydef
== null then
903 v
.error
(self, "Type Error: Expected method 'key' in Iterator type {ittype}")
906 self.method_key
= keydef
.mproperty
911 v
.modelbuilder
.error
(self, "NOT YET IMPLEMENTED: Do 'for' on {mtype}")
914 redef fun accept_typing
(v
)
916 var mtype
= v
.visit_expr
(n_expr
)
917 if mtype
== null then return
919 self.do_type_iterator
(v
, mtype
)
921 v
.visit_stmt
(n_block
)
926 redef class AAssertExpr
927 redef fun accept_typing
(v
)
929 v
.visit_expr_bool
(n_expr
)
937 redef fun accept_typing
(v
)
939 v
.visit_expr_bool
(n_expr
)
940 v
.visit_expr_bool
(n_expr2
)
941 self.mtype
= v
.type_bool
(self)
946 redef fun accept_typing
(v
)
948 v
.visit_expr_bool
(n_expr
)
949 v
.visit_expr_bool
(n_expr2
)
950 self.mtype
= v
.type_bool
(self)
956 redef fun accept_typing
(v
)
958 v
.visit_expr_bool
(n_expr
)
959 self.mtype
= v
.type_bool
(self)
963 redef class AOrElseExpr
964 redef fun accept_typing
(v
)
966 var t1
= v
.visit_expr
(n_expr
)
967 var t2
= v
.visit_expr
(n_expr2
)
969 if t1
== null or t2
== null then
973 if t1
isa MNullableType then
977 var t
= v
.merge_types
(self, [t1
, t2
])
979 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
986 redef fun accept_typing
(v
)
989 v
.visit_expr
(n_expr2
)
990 self.mtype
= v
.type_bool
(self)
994 redef class ATrueExpr
995 redef fun accept_typing
(v
)
997 self.mtype
= v
.type_bool
(self)
1001 redef class AFalseExpr
1002 redef fun accept_typing
(v
)
1004 self.mtype
= v
.type_bool
(self)
1008 redef class AIntExpr
1009 redef fun accept_typing
(v
)
1011 var mclass
= v
.get_mclass
(self, "Int")
1012 if mclass
== null then return # Forward error
1013 self.mtype
= mclass
.mclass_type
1017 redef class AFloatExpr
1018 redef fun accept_typing
(v
)
1020 var mclass
= v
.get_mclass
(self, "Float")
1021 if mclass
== null then return # Forward error
1022 self.mtype
= mclass
.mclass_type
1026 redef class ACharExpr
1027 redef fun accept_typing
(v
)
1029 var mclass
= v
.get_mclass
(self, "Char")
1030 if mclass
== null then return # Forward error
1031 self.mtype
= mclass
.mclass_type
1035 redef class AStringFormExpr
1036 redef fun accept_typing
(v
)
1038 var mclass
= v
.get_mclass
(self, "String")
1039 if mclass
== null then return # Forward error
1040 self.mtype
= mclass
.mclass_type
1044 redef class ASuperstringExpr
1045 redef fun accept_typing
(v
)
1047 var mclass
= v
.get_mclass
(self, "String")
1048 if mclass
== null then return # Forward error
1049 self.mtype
= mclass
.mclass_type
1050 for nexpr
in self.n_exprs
do
1051 var t
= v
.visit_expr
(nexpr
)
1056 redef class AArrayExpr
1057 redef fun accept_typing
(v
)
1059 var mtypes
= new Array[nullable MType]
1060 for e
in self.n_exprs
.n_exprs
do
1061 var t
= v
.visit_expr
(e
)
1067 var mtype
= v
.merge_types
(self, mtypes
)
1068 if mtype
== null then
1069 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1072 var mclass
= v
.get_mclass
(self, "Array")
1073 if mclass
== null then return # Forward error
1074 self.mtype
= mclass
.get_mtype
([mtype
])
1078 redef class ARangeExpr
1079 redef fun accept_typing
(v
)
1081 var discrete_class
= v
.get_mclass
(self, "Discrete")
1082 if discrete_class
== null then return # Forward error
1083 var discrete_type
= discrete_class
.intro
.bound_mtype
1084 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1085 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1086 if t1
== null or t2
== null then return
1087 var mclass
= v
.get_mclass
(self, "Range")
1088 if mclass
== null then return # Forward error
1089 if v
.is_subtype
(t1
, t2
) then
1090 self.mtype
= mclass
.get_mtype
([t2
])
1091 else if v
.is_subtype
(t2
, t1
) then
1092 self.mtype
= mclass
.get_mtype
([t1
])
1094 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1099 redef class ANullExpr
1100 redef fun accept_typing
(v
)
1102 self.mtype
= v
.mmodule
.model
.null_type
1106 redef class AIsaExpr
1107 # The static type to cast to.
1108 # (different from the static type of the expression that is `Bool`).
1109 var cast_type
: nullable MType
1110 redef fun accept_typing
(v
)
1112 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1113 self.cast_type
= mtype
1115 var variable
= self.n_expr
.its_variable
1116 if variable
!= null then
1117 var orig
= self.n_expr
.mtype
1118 var from
= if orig
!= null then orig
.to_s
else "invalid"
1119 var to
= if mtype
!= null then mtype
.to_s
else "invalid"
1120 #debug("adapt {variable}: {from} -> {to}")
1121 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1124 self.mtype
= v
.type_bool
(self)
1128 redef class AAsCastExpr
1129 redef fun accept_typing
(v
)
1131 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1135 redef class AAsNotnullExpr
1136 redef fun accept_typing
(v
)
1138 var mtype
= v
.visit_expr
(self.n_expr
)
1139 if mtype
isa MNullType then
1140 v
.error
(self, "Type error: as(not null) on null")
1143 if mtype
isa MNullableType then
1144 self.mtype
= mtype
.mtype
1147 # TODO: warn on useless as not null
1152 redef class AProxyExpr
1153 redef fun accept_typing
(v
)
1155 self.mtype
= v
.visit_expr
(self.n_expr
)
1159 redef class ASelfExpr
1160 redef var its_variable
: nullable Variable
1161 redef fun accept_typing
(v
)
1163 var variable
= v
.selfvariable
1164 self.its_variable
= variable
1165 self.mtype
= v
.get_variable
(self, variable
)
1169 ## MESSAGE SENDING AND PROPERTY
1171 redef class ASendExpr
1172 # @depreciated: use `callsite`
1173 fun mproperty
: nullable MMethod do return callsite
.mproperty
1175 # The property invoked by the send.
1176 var callsite
: nullable CallSite
1178 redef fun accept_typing
(v
)
1180 var recvtype
= v
.visit_expr
(self.n_expr
)
1181 var name
= self.property_name
1183 if recvtype
== null then return # Forward error
1184 if recvtype
isa MNullType then
1185 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1189 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1190 if callsite
== null then return
1191 self.callsite
= callsite
1192 var msignature
= callsite
.msignature
1194 var args
= compute_raw_arguments
1195 self.raw_arguments
= args
1197 callsite
.check_signature
(v
, args
)
1199 if callsite
.mproperty
.is_init
then
1200 var vmpropdef
= v
.mpropdef
1201 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1202 v
.error
(self, "Can call a init only in another init")
1206 var ret
= msignature
.return_mtype
1210 self.is_typed
= true
1213 if self.n_closure_defs
.length
== msignature
.mclosures
.length
then
1214 for i
in [0..self.n_closure_defs
.length
[ do
1215 self.n_closure_defs
[i
].accept_typing
(v
, msignature
.mclosures
[i
])
1218 debug
("closure: got {self.n_closure_defs.length}, want {msignature.mclosures.length}")
1222 # The name of the property
1223 # Each subclass simply provide the correct name.
1224 private fun property_name
: String is abstract
1226 # An array of all arguments (excluding self)
1227 var raw_arguments
: nullable Array[AExpr]
1229 private fun compute_raw_arguments
: Array[AExpr] is abstract
1232 redef class ABinopExpr
1233 redef fun compute_raw_arguments
do return [n_expr2
]
1236 redef fun property_name
do return "=="
1237 redef fun accept_typing
(v
)
1241 var variable
= self.n_expr
.its_variable
1242 if variable
== null then return
1243 var mtype
= self.n_expr2
.mtype
1244 if not mtype
isa MNullType then return
1245 var vartype
= v
.get_variable
(self, variable
)
1246 if not vartype
isa MNullableType then return
1247 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1248 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1249 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
1253 redef fun property_name
do return "!="
1254 redef fun accept_typing
(v
)
1258 var variable
= self.n_expr
.its_variable
1259 if variable
== null then return
1260 var mtype
= self.n_expr2
.mtype
1261 if not mtype
isa MNullType then return
1262 var vartype
= v
.get_variable
(self, variable
)
1263 if not vartype
isa MNullableType then return
1264 self.after_flow_context
.when_false
.set_var
(variable
, mtype
)
1265 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1266 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1270 redef fun property_name
do return "<"
1273 redef fun property_name
do return "<="
1276 redef fun property_name
do return "<<"
1279 redef fun property_name
do return ">"
1282 redef fun property_name
do return ">="
1285 redef fun property_name
do return ">>"
1287 redef class APlusExpr
1288 redef fun property_name
do return "+"
1290 redef class AMinusExpr
1291 redef fun property_name
do return "-"
1293 redef class AStarshipExpr
1294 redef fun property_name
do return "<=>"
1296 redef class AStarExpr
1297 redef fun property_name
do return "*"
1299 redef class ASlashExpr
1300 redef fun property_name
do return "/"
1302 redef class APercentExpr
1303 redef fun property_name
do return "%"
1306 redef class AUminusExpr
1307 redef fun property_name
do return "unary -"
1308 redef fun compute_raw_arguments
do return new Array[AExpr]
1312 redef class ACallExpr
1313 redef fun property_name
do return n_id
.text
1314 redef fun compute_raw_arguments
do return n_args
.to_a
1317 redef class ACallAssignExpr
1318 redef fun property_name
do return n_id
.text
+ "="
1319 redef fun compute_raw_arguments
1321 var res
= n_args
.to_a
1327 redef class ABraExpr
1328 redef fun property_name
do return "[]"
1329 redef fun compute_raw_arguments
do return n_args
.to_a
1332 redef class ABraAssignExpr
1333 redef fun property_name
do return "[]="
1334 redef fun compute_raw_arguments
1336 var res
= n_args
.to_a
1342 redef class ASendReassignFormExpr
1343 # @depreciated use `write_callsite`
1344 fun write_mproperty
: nullable MMethod do return write_callsite
.mproperty
1346 # The property invoked for the writing
1347 var write_callsite
: nullable CallSite
1349 redef fun accept_typing
(v
)
1351 var recvtype
= v
.visit_expr
(self.n_expr
)
1352 var name
= self.property_name
1354 if recvtype
== null then return # Forward error
1355 if recvtype
isa MNullType then
1356 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1360 var for_self
= self.n_expr
isa ASelfExpr
1361 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1363 if callsite
== null then return
1364 self.callsite
= callsite
1366 var args
= compute_raw_arguments
1367 self.raw_arguments
= args
1369 callsite
.check_signature
(v
, args
)
1371 var readtype
= callsite
.msignature
.return_mtype
1372 if readtype
== null then
1373 v
.error
(self, "Error: {name} is not a function")
1377 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1378 if wcallsite
== null then return
1379 self.write_callsite
= wcallsite
1381 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1382 if wtype
== null then return
1384 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1385 args
.add
(self.n_value
)
1386 wcallsite
.check_signature
(v
, args
)
1388 self.is_typed
= true
1392 redef class ACallReassignExpr
1393 redef fun property_name
do return n_id
.text
1394 redef fun compute_raw_arguments
do return n_args
.to_a
1397 redef class ABraReassignExpr
1398 redef fun property_name
do return "[]"
1399 redef fun compute_raw_arguments
do return n_args
.to_a
1402 redef class AInitExpr
1403 redef fun property_name
do return "init"
1404 redef fun compute_raw_arguments
do return n_args
.to_a
1408 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1413 redef class ASuperExpr
1414 # The method to call if the super is in fact a 'super init call'
1415 # Note: if the super is a normal call-next-method, then this attribute is null
1416 var mproperty
: nullable MMethod
1418 redef fun accept_typing
(v
)
1420 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1421 var mproperty
= v
.mpropdef
.mproperty
1422 if not mproperty
isa MMethod then
1423 v
.error
(self, "Error: super only usable in a method")
1426 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, recvtype
)
1427 if superprops
.length
== 0 then
1428 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1429 process_superinit
(v
)
1432 v
.error
(self, "Error: No super method to call for {mproperty}.")
1435 # FIXME: covariance of return type in linear extension?
1436 var superprop
= superprops
.first
1437 assert superprop
isa MMethodDef
1439 var msignature
= v
.resolve_signature_for
(superprop
, recvtype
, true)
1440 var args
= self.n_args
.to_a
1441 if args
.length
> 0 then
1442 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1444 self.mtype
= msignature
.return_mtype
1445 self.is_typed
= true
1448 private fun process_superinit
(v
: TypeVisitor)
1450 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1451 var mproperty
= v
.mpropdef
.mproperty
1452 var superprop
: nullable MMethodDef = null
1453 for msupertype
in v
.nclassdef
.mclassdef
.supertypes
do
1454 msupertype
= msupertype
.anchor_to
(v
.mmodule
, recvtype
)
1455 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1456 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1457 if candidate
== null then
1458 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forard error
1459 continue # Try next super-class
1461 if superprop
!= null and superprop
.mproperty
!= candidate
then
1462 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1465 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, recvtype
)
1466 if superprop
!= null then
1467 if superprop
== candidatedefs
.first
then continue
1468 candidatedefs
.add
(superprop
)
1470 if candidatedefs
.length
> 1 then
1471 v
.error
(self, "Error: confliting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1474 superprop
= candidatedefs
.first
1476 if superprop
== null then
1477 v
.error
(self, "Error: No super method to call for {mproperty}.")
1480 self.mproperty
= superprop
.mproperty
1482 var args
= self.n_args
.to_a
1483 var msignature
= v
.resolve_signature_for
(superprop
, recvtype
, true)
1484 if args
.length
> 0 then
1485 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1487 # TODO: Check signature
1490 self.is_typed
= true
1496 redef class ANewExpr
1497 # @depreciated use `callsite`
1498 fun mproperty
: nullable MMethod do return self.callsite
.mproperty
1500 # The constructor invoked by the new.
1501 var callsite
: nullable CallSite
1503 redef fun accept_typing
(v
)
1505 var recvtype
= v
.resolve_mtype
(self.n_type
)
1506 if recvtype
== null then return
1507 self.mtype
= recvtype
1509 if not recvtype
isa MClassType then
1510 if recvtype
isa MNullableType then
1511 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1514 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1526 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1527 if callsite
== null then return
1529 self.callsite
= callsite
1531 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1532 v
.error
(self, "Error: {name} is not a constructor.")
1536 var args
= n_args
.to_a
1537 callsite
.check_signature
(v
, args
)
1543 redef class AAttrFormExpr
1544 # The attribute acceded.
1545 var mproperty
: nullable MAttribute
1547 # The static type of the attribute.
1548 var attr_type
: nullable MType
1550 # Resolve the attribute acceded.
1551 private fun resolve_property
(v
: TypeVisitor)
1553 var recvtype
= v
.visit_expr
(self.n_expr
)
1554 if recvtype
== null then return # Skip error
1555 var name
= self.n_id
.text
1556 if recvtype
isa MNullType then
1557 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1561 var unsafe_type
= v
.anchor_to
(recvtype
)
1562 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1563 if mproperty
== null then
1564 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1567 assert mproperty
isa MAttribute
1568 self.mproperty
= mproperty
1570 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1571 assert mpropdefs
.length
== 1
1572 var mpropdef
= mpropdefs
.first
1573 var attr_type
= mpropdef
.static_mtype
.as(not null)
1574 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1575 self.attr_type
= attr_type
1579 redef class AAttrExpr
1580 redef fun accept_typing
(v
)
1582 self.resolve_property
(v
)
1583 self.mtype
= self.attr_type
1588 redef class AAttrAssignExpr
1589 redef fun accept_typing
(v
)
1591 self.resolve_property
(v
)
1592 var mtype
= self.attr_type
1594 v
.visit_expr_subtype
(self.n_value
, mtype
)
1595 self.is_typed
= true
1599 redef class AAttrReassignExpr
1600 redef fun accept_typing
(v
)
1602 self.resolve_property
(v
)
1603 var mtype
= self.attr_type
1604 if mtype
== null then return # Skip error
1606 self.resolve_reassignment
(v
, mtype
, mtype
)
1608 self.is_typed
= true
1612 redef class AIssetAttrExpr
1613 redef fun accept_typing
(v
)
1615 self.resolve_property
(v
)
1616 var mtype
= self.attr_type
1617 if mtype
== null then return # Skip error
1619 var recvtype
= self.n_expr
.mtype
.as(not null)
1620 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1621 if bound
isa MNullableType then
1622 v
.error
(self, "Error: isset on a nullable attribute.")
1624 self.mtype
= v
.type_bool
(self)
1630 redef class AClosureCallExpr
1631 redef fun accept_typing
(v
)
1633 var variable
= self.variable
1634 if variable
== null then return # Skip error
1636 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1637 var msignature
= variable
.declared_type
.as(not null)
1638 msignature
= v
.resolve_for
(msignature
, recvtype
, false).as(MSignature)
1640 var args
= n_args
.to_a
1641 v
.check_signature
(self, args
, variable
.name
, msignature
)
1643 self.is_typed
= true
1644 self.mtype
= msignature
.return_mtype
1648 redef class AClosureDef
1649 var mclosure
: nullable MParameter
1651 private fun accept_typing
(v
: TypeVisitor, mparameter
: MParameter)
1653 var variables
= self.variables
1654 if variables
== null then return
1656 self.mclosure
= mparameter
1657 var msignature
= mparameter
.mtype
.as(MSignature)
1659 if msignature
.arity
!= variables
.length
then
1660 v
.error
(self, "Type error: closure {mparameter.name} expects {msignature.arity} parameters, {variables.length} given")
1664 for i
in [0..variables
.length
[ do
1665 variables
[i
].declared_type
= msignature
.mparameters
[i
].mtype
1668 v
.visit_stmt
(self.n_expr
)
1674 redef class ADebugTypeExpr
1675 redef fun accept_typing
(v
)
1677 var expr
= v
.visit_expr
(self.n_expr
)
1678 if expr
== null then return
1679 var unsafe
= v
.anchor_to
(expr
)
1680 var ntype
= self.n_type
1681 var mtype
= v
.resolve_mtype
(ntype
)
1682 if mtype
!= null and mtype
!= expr
then
1683 var umtype
= v
.anchor_to
(mtype
)
1684 v
.modelbuilder
.warning
(self, "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1686 self.is_typed
= true