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
38 # The module of the analysis
39 # Used to correctly query the model
42 # The static type of the receiver
43 # Mainly used for type tests and type resolutions
44 var anchor
: nullable MClassType
46 # The analyzed mclassdef
47 var mclassdef
: nullable MClassDef
49 # The analyzed property
50 var mpropdef
: nullable MPropDef
52 var selfvariable
: Variable = new Variable("self")
54 # Is `self` use restricted?
55 # * no explicit `self`
56 # * method called on the implicit self must be top-level
57 var is_toplevel_context
= false
59 init(modelbuilder
: ModelBuilder, mmodule
: MModule, mpropdef
: nullable MPropDef)
61 self.modelbuilder
= modelbuilder
62 self.mmodule
= mmodule
64 if mpropdef
!= null then
65 self.mpropdef
= mpropdef
66 var mclassdef
= mpropdef
.mclassdef
67 self.mclassdef
= mclassdef
68 self.anchor
= mclassdef
.bound_mtype
70 var mclass
= mclassdef
.mclass
72 var selfvariable
= new Variable("self")
73 self.selfvariable
= selfvariable
74 selfvariable
.declared_type
= mclass
.mclass_type
76 var mprop
= mpropdef
.mproperty
77 if mprop
isa MMethod and mprop
.is_toplevel
then
78 is_toplevel_context
= true
83 fun anchor_to
(mtype
: MType): MType
86 if anchor
== null then
87 assert not mtype
.need_anchor
90 return mtype
.anchor_to
(mmodule
, anchor
)
93 fun is_subtype
(sub
, sup
: MType): Bool
95 return sub
.is_subtype
(mmodule
, anchor
, sup
)
98 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
100 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
101 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
105 # Check that `sub` is a subtype of `sup`.
106 # If `sub` is not a valud suptype, then display an error on `node` an return null.
107 # If `sub` is a safe subtype of `sup` then return `sub`.
108 # If `sub` is an insafe subtype (ie an imlicit cast is required), then return `sup`.
110 # The point of the return type is to determinate the usable type on an expression:
111 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
112 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
113 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
115 if self.is_subtype
(sub
, sup
) then return sub
116 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
117 # FIXME workarround to the current unsafe typing policy. To remove once fixed virtual types exists.
118 #node.debug("Unsafe typing: expected {sup}, got {sub}")
121 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
125 # Visit an expression and do not care about the return value
126 fun visit_stmt
(nexpr
: nullable AExpr)
128 if nexpr
== null then return
129 nexpr
.accept_typing
(self)
132 # Visit an expression and expects that it is not a statement
133 # Return the type of the expression
134 # Display an error and return null if:
135 # * the type cannot be determined or
136 # * `nexpr` is a statement
137 fun visit_expr
(nexpr
: AExpr): nullable MType
139 nexpr
.accept_typing
(self)
140 var mtype
= nexpr
.mtype
141 if mtype
!= null then return mtype
142 if not nexpr
.is_typed
then
143 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
144 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
145 nexpr
.debug
("No return type but no error.")
148 return null # forward error
150 self.error
(nexpr
, "Type error: expected expression.")
154 # Visit an expression and expect its static type is a least a `sup`
155 # Return the type of the expression or null if
156 # * the type cannot be determined or
157 # * `nexpr` is a statement or
158 # * `nexpr` is not a `sup`
159 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
161 var sub
= visit_expr
(nexpr
)
162 if sub
== null then return null # Forward error
164 if sup
== null then return null # Forward error
166 var res
= check_subtype
(nexpr
, sub
, sup
)
168 nexpr
.implicit_cast_to
= res
173 # Visit an expression and expect its static type is a `Bool`
174 # Return the type of the expression or null if
175 # * the type cannot be determined or
176 # * `nexpr` is a statement or
177 # * `nexpr` is not a `Bool`
178 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
180 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
184 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
186 var sub
= visit_expr
(nexpr
)
187 if sub
== null then return null # Forward error
189 var sup
= self.resolve_mtype
(ntype
)
190 if sup
== null then return null # Forward error
193 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup}.")
194 else if self.is_subtype
(sub
, sup
) and not sup
.need_anchor
then
195 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup} since it is a {sub}.")
200 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
202 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
205 fun resolve_mtype
(node
: AType): nullable MType
207 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
210 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
212 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
216 fun get_mclass
(node
: ANode, name
: String): nullable MClass
218 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
219 if mclass
== null then
220 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
225 fun type_bool
(node
: ANode): nullable MType
227 var mclass
= self.get_mclass
(node
, "Bool")
228 if mclass
== null then return null
229 return mclass
.mclass_type
232 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
234 var unsafe_type
= self.anchor_to
(recvtype
)
236 #debug("recv: {recvtype} (aka {unsafe_type})")
237 if recvtype
isa MNullType then
238 self.error
(node
, "Error: Method '{name}' call on 'null'.")
242 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
243 if mproperty
== null then
244 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
246 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
248 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
253 assert mproperty
isa MMethod
255 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
and name
!= "sys" and name
!= "exit" and name
!= "args" then
256 # FIXME named methods are here as a workaround
257 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
259 if not recv_is_self
and mproperty
.is_toplevel
then
260 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
263 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
264 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
268 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
270 if propdefs
.length
== 0 then
271 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
273 else if propdefs
.length
== 1 then
274 mpropdef
= propdefs
.first
276 self.modelbuilder
.warning
(node
, "Warning: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
277 mpropdef
= mproperty
.intro
281 var msignature
= mpropdef
.msignature
.as(not null)
282 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
284 var erasure_cast
= false
285 var rettype
= mpropdef
.msignature
.return_mtype
286 if not recv_is_self
and rettype
!= null then
287 if rettype
isa MNullableType then rettype
= rettype
.mtype
288 if rettype
isa MParameterType then
289 var erased_rettype
= msignature
.return_mtype
290 assert erased_rettype
!= null
291 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
296 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
300 # Visit the expressions of args and cheik their conformity with the corresponding typi in signature
301 # The point of this method is to handle varargs correctly
302 # Note: The signature must be correctly adapted
303 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
305 var vararg_rank
= msignature
.vararg_rank
306 if vararg_rank
>= 0 then
307 if args
.length
< msignature
.arity
then
308 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
309 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
312 else if args
.length
!= msignature
.arity
then
313 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
317 #debug("CALL {unsafe_type}.{msignature}")
319 var vararg_decl
= args
.length
- msignature
.arity
320 for i
in [0..msignature
.arity
[ do
322 if i
== vararg_rank
then continue # skip the vararg
323 if i
> vararg_rank
then
326 var paramtype
= msignature
.mparameters
[i
].mtype
327 self.visit_expr_subtype
(args
[j
], paramtype
)
329 if vararg_rank
>= 0 then
330 var varargs
= new Array[AExpr]
331 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
332 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
334 self.visit_expr_subtype
(args
[j
], paramtype
)
340 fun error
(node
: ANode, message
: String)
342 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
345 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
347 var flow
= node
.after_flow_context
349 self.error
(node
, "No context!")
353 if flow
.vars
.has_key
(variable
) then
354 return flow
.vars
[variable
]
356 #node.debug("*** START Collected for {variable}")
357 var mtypes
= flow
.collect_types
(variable
)
358 #node.debug("**** END Collected for {variable}")
359 if mtypes
== null or mtypes
.length
== 0 then
360 return variable
.declared_type
361 else if mtypes
.length
== 1 then
364 var res
= merge_types
(node
,mtypes
)
365 if res
== null then res
= variable
.declared_type
371 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
373 var flow
= node
.after_flow_context
376 flow
.set_var
(variable
, mtype
)
379 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
381 if col
.length
== 1 then return col
.first
382 var res
= new Array[nullable MType]
384 if t1
== null then continue # return null
387 if t2
== null then continue # return null
388 if t2
isa MNullableType or t2
isa MNullType then
391 if not is_subtype
(t2
, t1
) then found
= false
394 #print "merge {col.join(" ")} -> {t1}"
398 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
403 # A specific method call site with its associated informations.
405 # The assiciated node for location
408 # The static type of the receiver (possibly unresolved)
411 # The module where the callsite is present
414 # The anchor to use with `recv` or `msignature`
415 var anchor
: nullable MClassType
417 # Is the receiver self?
418 # If "for_self", virtual types of the signature are keeped
419 # If "not_for_self", virtual type are erased
420 var recv_is_self
: Bool
422 # The designated method
423 var mproperty
: MMethod
425 # The statically designated method definition
426 # The most specif one, it is.
427 var mpropdef
: MMethodDef
429 # The resolved signature for the receiver
430 var msignature
: MSignature
432 # Is a implicit cast required on erasure typing policy?
433 var erasure_cast
: Bool
435 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
437 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
442 # The declared type of the variable
443 var declared_type
: nullable MType
446 redef class FlowContext
447 # Store changes of types because of type evolution
448 private var vars
: HashMap[Variable, nullable MType] = new HashMap[Variable, nullable MType]
449 private var cache
: HashMap[Variable, nullable Array[nullable MType]] = new HashMap[Variable, nullable Array[nullable MType]]
451 # Adapt the variable to a static type
452 # Warning1: do not modify vars directly.
453 # Warning2: sub-flow may have cached a unadapted variabial
454 private fun set_var
(variable
: Variable, mtype
: nullable MType)
456 self.vars
[variable
] = mtype
457 self.cache
.keys
.remove
(variable
)
460 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
462 if cache
.has_key
(variable
) then
463 return cache
[variable
]
465 var res
: nullable Array[nullable MType] = null
466 if vars
.has_key
(variable
) then
467 var mtype
= vars
[variable
]
469 else if self.previous
.is_empty
then
471 res
= [variable
.declared_type
]
473 for flow
in self.previous
do
474 if flow
.is_unreachable
then continue
475 var r2
= flow
.collect_types
(variable
)
476 if r2
== null then continue
481 if not res
.has
(t
) then res
.add
(t
)
486 cache
[variable
] = res
492 # The entry point of the whole typing analysis
493 fun do_typing
(modelbuilder
: ModelBuilder)
497 # The variable associated to the reciever (if any)
498 var selfvariable
: nullable Variable
501 redef class AMethPropdef
502 redef fun do_typing
(modelbuilder
: ModelBuilder)
504 var nblock
= self.n_block
505 if nblock
== null then return
507 var mpropdef
= self.mpropdef
.as(not null)
508 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
509 self.selfvariable
= v
.selfvariable
511 var mmethoddef
= self.mpropdef
.as(not null)
512 for i
in [0..mmethoddef
.msignature
.arity
[ do
513 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
514 if mmethoddef
.msignature
.vararg_rank
== i
then
515 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
516 if arrayclass
== null then return # Skip error
517 mtype
= arrayclass
.get_mtype
([mtype
])
519 var variable
= self.n_signature
.n_params
[i
].variable
520 assert variable
!= null
521 variable
.declared_type
= mtype
525 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
526 # We reach the end of the function without having a return, it is bad
527 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
532 redef class AAttrPropdef
533 redef fun do_typing
(modelbuilder
: ModelBuilder)
535 var mpropdef
= self.mpropdef
.as(not null)
536 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
537 self.selfvariable
= v
.selfvariable
539 var nexpr
= self.n_expr
540 if nexpr
!= null then
541 var mtype
= self.mpropdef
.static_mtype
542 v
.visit_expr_subtype
(nexpr
, mtype
)
550 # The static type of the expression.
551 # null if self is a statement or in case of error
552 var mtype
: nullable MType = null
554 # Is the statement correctly typed?
555 # Used to distinguish errors and statements when `mtype == null`
556 var is_typed
: Bool = false
558 # If required, the following implicit cast `.as(XXX)`
559 # Such a cast may by required after evaluating the expression when
560 # a unsafe operation is detected (silently accepted by the Nit language).
561 # The attribute is computed by `check_subtype`
562 var implicit_cast_to
: nullable MType = null
564 # Return the variable read (if any)
565 # Used to perform adaptive typing
566 fun its_variable
: nullable Variable do return null
568 private fun accept_typing
(v
: TypeVisitor)
570 v
.error
(self, "no implemented accept_typing for {self.class_name}")
574 redef class ABlockExpr
575 redef fun accept_typing
(v
)
577 for e
in self.n_expr
do v
.visit_stmt
(e
)
581 # The type of a blockexpr is the one of the last expression (or null if empty)
584 if self.n_expr
.is_empty
then return null
585 return self.n_expr
.last
.mtype
589 redef class AVardeclExpr
590 redef fun accept_typing
(v
)
592 var variable
= self.variable
593 if variable
== null then return # Skip error
595 var ntype
= self.n_type
596 var mtype
: nullable MType
597 if ntype
== null then
600 mtype
= v
.resolve_mtype
(ntype
)
601 if mtype
== null then return # Skip error
604 var nexpr
= self.n_expr
605 if nexpr
!= null then
606 if mtype
!= null then
607 v
.visit_expr_subtype
(nexpr
, mtype
)
609 mtype
= v
.visit_expr
(nexpr
)
610 if mtype
== null then return # Skip error
615 if mtype
== null or mtype
isa MNullType then
616 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
617 if mtype
== null then mtype
= decltype
620 variable
.declared_type
= decltype
621 v
.set_variable
(self, variable
, mtype
)
623 #debug("var {variable}: {mtype}")
630 redef fun its_variable
do return self.variable
631 redef fun accept_typing
(v
)
633 var variable
= self.variable
634 if variable
== null then return # Skip error
636 var mtype
= v
.get_variable
(self, variable
)
637 if mtype
!= null then
638 #debug("{variable} is {mtype}")
640 #debug("{variable} is untyped")
647 redef class AVarAssignExpr
648 redef fun accept_typing
(v
)
650 var variable
= self.variable
651 assert variable
!= null
653 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
655 v
.set_variable
(self, variable
, mtype
)
661 redef class AReassignFormExpr
662 # The method designed by the reassign operator.
663 var reassign_callsite
: nullable CallSite
665 var read_type
: nullable MType = null
667 # Determine the `reassign_property`
668 # `readtype` is the type of the reading of the left value.
669 # `writetype` is the type of the writing of the left value.
670 # (Because of `ACallReassignExpr`, both can be different.
671 # Return the static type of the value to store.
672 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
674 var reassign_name
: String
675 if self.n_assign_op
isa APlusAssignOp then
677 else if self.n_assign_op
isa AMinusAssignOp then
683 self.read_type
= readtype
685 if readtype
isa MNullType then
686 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
690 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
691 if callsite
== null then return null # Skip error
692 self.reassign_callsite
= callsite
694 var msignature
= callsite
.msignature
695 var rettype
= msignature
.return_mtype
696 assert msignature
.arity
== 1 and rettype
!= null
698 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
699 if value_type
== null then return null # Skip error
701 v
.check_subtype
(self, rettype
, writetype
)
706 redef class AVarReassignExpr
707 redef fun accept_typing
(v
)
709 var variable
= self.variable
710 assert variable
!= null
712 var readtype
= v
.get_variable
(self, variable
)
713 if readtype
== null then return
717 var writetype
= variable
.declared_type
718 if writetype
== null then return
720 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
722 v
.set_variable
(self, variable
, rettype
)
729 redef class AContinueExpr
730 redef fun accept_typing
(v
)
732 var nexpr
= self.n_expr
733 if nexpr
!= null then
734 var mtype
= v
.visit_expr
(nexpr
)
740 redef class ABreakExpr
741 redef fun accept_typing
(v
)
743 var nexpr
= self.n_expr
744 if nexpr
!= null then
745 var mtype
= v
.visit_expr
(nexpr
)
751 redef class AReturnExpr
752 redef fun accept_typing
(v
)
754 var nexpr
= self.n_expr
755 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
756 if nexpr
!= null then
757 if ret_type
!= null then
758 var mtype
= v
.visit_expr_subtype
(nexpr
, ret_type
)
760 var mtype
= v
.visit_expr
(nexpr
)
761 v
.error
(self, "Error: Return with value in a procedure.")
763 else if ret_type
!= null then
764 v
.error
(self, "Error: Return without value in a function.")
770 redef class AAbortExpr
771 redef fun accept_typing
(v
)
778 redef fun accept_typing
(v
)
780 v
.visit_expr_bool
(n_expr
)
788 redef class AIfexprExpr
789 redef fun accept_typing
(v
)
791 v
.visit_expr_bool
(n_expr
)
793 var t1
= v
.visit_expr
(n_then
)
794 var t2
= v
.visit_expr
(n_else
)
796 if t1
== null or t2
== null then
800 var t
= v
.merge_types
(self, [t1
, t2
])
802 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
809 redef fun accept_typing
(v
)
811 v
.visit_stmt
(n_block
)
816 redef class AWhileExpr
817 redef fun accept_typing
(v
)
819 v
.visit_expr_bool
(n_expr
)
821 v
.visit_stmt
(n_block
)
826 redef class ALoopExpr
827 redef fun accept_typing
(v
)
829 v
.visit_stmt
(n_block
)
835 var coltype
: nullable MClassType
837 var method_iterator
: nullable CallSite
838 var method_is_ok
: nullable CallSite
839 var method_item
: nullable CallSite
840 var method_next
: nullable CallSite
841 var method_key
: nullable CallSite
843 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
845 if mtype
isa MNullType then
846 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
851 var objcla
= v
.get_mclass
(self, "Object")
852 if objcla
== null then return
854 # check iterator method
855 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
856 if itdef
== null then
857 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
860 self.method_iterator
= itdef
862 # check that iterator return something
863 var ittype
= itdef
.msignature
.return_mtype
864 if ittype
== null then
865 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
870 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
871 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
875 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
877 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
878 var variables
= self.variables
879 if variables
.length
!= 1 then
880 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
882 variables
.first
.declared_type
= coltype
.arguments
.first
887 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
889 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
890 var variables
= self.variables
891 if variables
.length
!= 2 then
892 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
894 variables
[0].declared_type
= coltype
.arguments
[0]
895 variables
[1].declared_type
= coltype
.arguments
[1]
900 if not is_col
and not is_map
then
901 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
905 # anchor formal and virtual types
906 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
908 if mtype
isa MNullableType then mtype
= mtype
.mtype
909 self.coltype
= mtype
.as(MClassType)
911 # get methods is_ok, next, item
912 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
913 if ikdef
== null then
914 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
917 self.method_is_ok
= ikdef
919 var itemdef
= v
.get_method
(self, ittype
, "item", false)
920 if itemdef
== null then
921 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
924 self.method_item
= itemdef
926 var nextdef
= v
.get_method
(self, ittype
, "next", false)
927 if nextdef
== null then
928 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
931 self.method_next
= nextdef
934 var keydef
= v
.get_method
(self, ittype
, "key", false)
935 if keydef
== null then
936 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
939 self.method_key
= keydef
943 redef fun accept_typing
(v
)
945 var mtype
= v
.visit_expr
(n_expr
)
946 if mtype
== null then return
948 self.do_type_iterator
(v
, mtype
)
950 v
.visit_stmt
(n_block
)
955 redef class AAssertExpr
956 redef fun accept_typing
(v
)
958 v
.visit_expr_bool
(n_expr
)
966 redef fun accept_typing
(v
)
968 v
.visit_expr_bool
(n_expr
)
969 v
.visit_expr_bool
(n_expr2
)
970 self.mtype
= v
.type_bool
(self)
974 redef class AImpliesExpr
975 redef fun accept_typing
(v
)
977 v
.visit_expr_bool
(n_expr
)
978 v
.visit_expr_bool
(n_expr2
)
979 self.mtype
= v
.type_bool
(self)
984 redef fun accept_typing
(v
)
986 v
.visit_expr_bool
(n_expr
)
987 v
.visit_expr_bool
(n_expr2
)
988 self.mtype
= v
.type_bool
(self)
994 redef fun accept_typing
(v
)
996 v
.visit_expr_bool
(n_expr
)
997 self.mtype
= v
.type_bool
(self)
1001 redef class AOrElseExpr
1002 redef fun accept_typing
(v
)
1004 var t1
= v
.visit_expr
(n_expr
)
1005 var t2
= v
.visit_expr
(n_expr2
)
1007 if t1
== null or t2
== null then
1011 if t1
isa MNullableType then
1015 var t
= v
.merge_types
(self, [t1
, t2
])
1017 t
= v
.mmodule
.object_type
1018 if t2
isa MNullableType then
1021 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1027 redef class ATrueExpr
1028 redef fun accept_typing
(v
)
1030 self.mtype
= v
.type_bool
(self)
1034 redef class AFalseExpr
1035 redef fun accept_typing
(v
)
1037 self.mtype
= v
.type_bool
(self)
1041 redef class AIntExpr
1042 redef fun accept_typing
(v
)
1044 var mclass
= v
.get_mclass
(self, "Int")
1045 if mclass
== null then return # Forward error
1046 self.mtype
= mclass
.mclass_type
1050 redef class AFloatExpr
1051 redef fun accept_typing
(v
)
1053 var mclass
= v
.get_mclass
(self, "Float")
1054 if mclass
== null then return # Forward error
1055 self.mtype
= mclass
.mclass_type
1059 redef class ACharExpr
1060 redef fun accept_typing
(v
)
1062 var mclass
= v
.get_mclass
(self, "Char")
1063 if mclass
== null then return # Forward error
1064 self.mtype
= mclass
.mclass_type
1068 redef class AStringFormExpr
1069 redef fun accept_typing
(v
)
1071 var mclass
= v
.get_mclass
(self, "String")
1072 if mclass
== null then return # Forward error
1073 self.mtype
= mclass
.mclass_type
1077 redef class ASuperstringExpr
1078 redef fun accept_typing
(v
)
1080 var mclass
= v
.get_mclass
(self, "String")
1081 if mclass
== null then return # Forward error
1082 self.mtype
= mclass
.mclass_type
1083 for nexpr
in self.n_exprs
do
1084 var t
= v
.visit_expr
(nexpr
)
1089 redef class AArrayExpr
1090 var with_capacity_callsite
: nullable CallSite
1091 var push_callsite
: nullable CallSite
1093 redef fun accept_typing
(v
)
1095 var mtypes
= new Array[nullable MType]
1096 for e
in self.n_exprs
.n_exprs
do
1097 var t
= v
.visit_expr
(e
)
1103 var mtype
= v
.merge_types
(self, mtypes
)
1104 if mtype
== null then
1105 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1108 var mclass
= v
.get_mclass
(self, "Array")
1109 if mclass
== null then return # Forward error
1110 var array_mtype
= mclass
.get_mtype
([mtype
])
1112 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1113 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1115 self.mtype
= array_mtype
1119 redef class ARangeExpr
1120 var init_callsite
: nullable CallSite
1122 redef fun accept_typing
(v
)
1124 var discrete_class
= v
.get_mclass
(self, "Discrete")
1125 if discrete_class
== null then return # Forward error
1126 var discrete_type
= discrete_class
.intro
.bound_mtype
1127 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1128 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1129 if t1
== null or t2
== null then return
1130 var mclass
= v
.get_mclass
(self, "Range")
1131 if mclass
== null then return # Forward error
1133 if v
.is_subtype
(t1
, t2
) then
1134 mtype
= mclass
.get_mtype
([t2
])
1135 else if v
.is_subtype
(t2
, t1
) then
1136 mtype
= mclass
.get_mtype
([t1
])
1138 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1144 # get the constructor
1146 if self isa ACrangeExpr then
1147 callsite
= v
.get_method
(self, mtype
, "init", false)
1148 else if self isa AOrangeExpr then
1149 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1153 init_callsite
= callsite
1157 redef class ANullExpr
1158 redef fun accept_typing
(v
)
1160 self.mtype
= v
.mmodule
.model
.null_type
1164 redef class AIsaExpr
1165 # The static type to cast to.
1166 # (different from the static type of the expression that is `Bool`).
1167 var cast_type
: nullable MType
1168 redef fun accept_typing
(v
)
1170 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1171 self.cast_type
= mtype
1173 var variable
= self.n_expr
.its_variable
1174 if variable
!= null then
1175 var orig
= self.n_expr
.mtype
1176 var from
= if orig
!= null then orig
.to_s
else "invalid"
1177 var to
= if mtype
!= null then mtype
.to_s
else "invalid"
1178 #debug("adapt {variable}: {from} -> {to}")
1179 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1182 self.mtype
= v
.type_bool
(self)
1186 redef class AAsCastExpr
1187 redef fun accept_typing
(v
)
1189 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1193 redef class AAsNotnullExpr
1194 redef fun accept_typing
(v
)
1196 var mtype
= v
.visit_expr
(self.n_expr
)
1197 if mtype
isa MNullType then
1198 v
.error
(self, "Type error: as(not null) on null")
1201 if mtype
isa MNullableType then
1202 self.mtype
= mtype
.mtype
1205 # TODO: warn on useless as not null
1210 redef class AProxyExpr
1211 redef fun accept_typing
(v
)
1213 self.mtype
= v
.visit_expr
(self.n_expr
)
1217 redef class ASelfExpr
1218 redef var its_variable
: nullable Variable
1219 redef fun accept_typing
(v
)
1221 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1222 v
.error
(self, "Error: self cannot be used in top-level method.")
1224 var variable
= v
.selfvariable
1225 self.its_variable
= variable
1226 self.mtype
= v
.get_variable
(self, variable
)
1230 ## MESSAGE SENDING AND PROPERTY
1232 redef class ASendExpr
1233 # The property invoked by the send.
1234 var callsite
: nullable CallSite
1236 redef fun accept_typing
(v
)
1238 var recvtype
= v
.visit_expr
(self.n_expr
)
1239 var name
= self.property_name
1241 if recvtype
== null then return # Forward error
1242 if recvtype
isa MNullType then
1243 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1247 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1248 if callsite
== null then return
1249 self.callsite
= callsite
1250 var msignature
= callsite
.msignature
1252 var args
= compute_raw_arguments
1254 callsite
.check_signature
(v
, args
)
1256 if callsite
.mproperty
.is_init
then
1257 var vmpropdef
= v
.mpropdef
1258 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1259 v
.error
(self, "Can call a init only in another init")
1263 var ret
= msignature
.return_mtype
1267 self.is_typed
= true
1271 # The name of the property
1272 # Each subclass simply provide the correct name.
1273 private fun property_name
: String is abstract
1275 # An array of all arguments (excluding self)
1276 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1278 private fun compute_raw_arguments
: Array[AExpr] is abstract
1281 redef class ABinopExpr
1282 redef fun compute_raw_arguments
do return [n_expr2
]
1285 redef fun property_name
do return "=="
1286 redef fun accept_typing
(v
)
1290 var variable
= self.n_expr
.its_variable
1291 if variable
== null then return
1292 var mtype
= self.n_expr2
.mtype
1293 if not mtype
isa MNullType then return
1294 var vartype
= v
.get_variable
(self, variable
)
1295 if not vartype
isa MNullableType then return
1296 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1297 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1298 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
1302 redef fun property_name
do return "!="
1303 redef fun accept_typing
(v
)
1307 var variable
= self.n_expr
.its_variable
1308 if variable
== null then return
1309 var mtype
= self.n_expr2
.mtype
1310 if not mtype
isa MNullType then return
1311 var vartype
= v
.get_variable
(self, variable
)
1312 if not vartype
isa MNullableType then return
1313 self.after_flow_context
.when_false
.set_var
(variable
, mtype
)
1314 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1315 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1319 redef fun property_name
do return "<"
1322 redef fun property_name
do return "<="
1325 redef fun property_name
do return "<<"
1328 redef fun property_name
do return ">"
1331 redef fun property_name
do return ">="
1334 redef fun property_name
do return ">>"
1336 redef class APlusExpr
1337 redef fun property_name
do return "+"
1339 redef class AMinusExpr
1340 redef fun property_name
do return "-"
1342 redef class AStarshipExpr
1343 redef fun property_name
do return "<=>"
1345 redef class AStarExpr
1346 redef fun property_name
do return "*"
1348 redef class ASlashExpr
1349 redef fun property_name
do return "/"
1351 redef class APercentExpr
1352 redef fun property_name
do return "%"
1355 redef class AUminusExpr
1356 redef fun property_name
do return "unary -"
1357 redef fun compute_raw_arguments
do return new Array[AExpr]
1361 redef class ACallExpr
1362 redef fun property_name
do return n_id
.text
1363 redef fun compute_raw_arguments
do return n_args
.to_a
1366 redef class ACallAssignExpr
1367 redef fun property_name
do return n_id
.text
+ "="
1368 redef fun compute_raw_arguments
1370 var res
= n_args
.to_a
1376 redef class ABraExpr
1377 redef fun property_name
do return "[]"
1378 redef fun compute_raw_arguments
do return n_args
.to_a
1381 redef class ABraAssignExpr
1382 redef fun property_name
do return "[]="
1383 redef fun compute_raw_arguments
1385 var res
= n_args
.to_a
1391 redef class ASendReassignFormExpr
1392 # The property invoked for the writing
1393 var write_callsite
: nullable CallSite
1395 redef fun accept_typing
(v
)
1397 var recvtype
= v
.visit_expr
(self.n_expr
)
1398 var name
= self.property_name
1400 if recvtype
== null then return # Forward error
1401 if recvtype
isa MNullType then
1402 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1406 var for_self
= self.n_expr
isa ASelfExpr
1407 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1409 if callsite
== null then return
1410 self.callsite
= callsite
1412 var args
= compute_raw_arguments
1414 callsite
.check_signature
(v
, args
)
1416 var readtype
= callsite
.msignature
.return_mtype
1417 if readtype
== null then
1418 v
.error
(self, "Error: {name} is not a function")
1422 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1423 if wcallsite
== null then return
1424 self.write_callsite
= wcallsite
1426 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1427 if wtype
== null then return
1429 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1430 args
.add
(self.n_value
)
1431 wcallsite
.check_signature
(v
, args
)
1433 self.is_typed
= true
1437 redef class ACallReassignExpr
1438 redef fun property_name
do return n_id
.text
1439 redef fun compute_raw_arguments
do return n_args
.to_a
1442 redef class ABraReassignExpr
1443 redef fun property_name
do return "[]"
1444 redef fun compute_raw_arguments
do return n_args
.to_a
1447 redef class AInitExpr
1448 redef fun property_name
do return "init"
1449 redef fun compute_raw_arguments
do return n_args
.to_a
1453 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1458 redef class ASuperExpr
1459 # The method to call if the super is in fact a 'super init call'
1460 # Note: if the super is a normal call-next-method, then this attribute is null
1461 var callsite
: nullable CallSite
1463 # The method to call is the super is a standard `call-next-method` super-call
1464 # Note: if the super is a special super-init-call, then this attribute is null
1465 var mpropdef
: nullable MMethodDef
1467 redef fun accept_typing
(v
)
1469 var recvtype
= v
.anchor
1470 assert recvtype
!= null
1471 var mproperty
= v
.mpropdef
.mproperty
1472 if not mproperty
isa MMethod then
1473 v
.error
(self, "Error: super only usable in a method")
1476 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, recvtype
)
1477 if superprops
.length
== 0 then
1478 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1479 process_superinit
(v
)
1482 v
.error
(self, "Error: No super method to call for {mproperty}.")
1485 # FIXME: covariance of return type in linear extension?
1486 var superprop
= superprops
.first
1488 var msignature
= superprop
.msignature
.as(not null)
1489 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1490 var args
= self.n_args
.to_a
1491 if args
.length
> 0 then
1492 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1494 self.mtype
= msignature
.return_mtype
1495 self.is_typed
= true
1496 v
.mpropdef
.has_supercall
= true
1497 mpropdef
= v
.mpropdef
.as(MMethodDef)
1500 private fun process_superinit
(v
: TypeVisitor)
1502 var recvtype
= v
.anchor
1503 assert recvtype
!= null
1504 var mpropdef
= v
.mpropdef
1505 assert mpropdef
isa MMethodDef
1506 var mproperty
= mpropdef
.mproperty
1507 var superprop
: nullable MMethodDef = null
1508 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1509 msupertype
= msupertype
.anchor_to
(v
.mmodule
, recvtype
)
1510 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1511 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1512 if candidate
== null then
1513 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forard error
1514 continue # Try next super-class
1516 if superprop
!= null and superprop
.mproperty
!= candidate
then
1517 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1520 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, recvtype
)
1521 if superprop
!= null then
1522 if superprop
== candidatedefs
.first
then continue
1523 candidatedefs
.add
(superprop
)
1525 if candidatedefs
.length
> 1 then
1526 v
.error
(self, "Error: confliting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1529 superprop
= candidatedefs
.first
1531 if superprop
== null then
1532 v
.error
(self, "Error: No super method to call for {mproperty}.")
1536 var msignature
= superprop
.msignature
.as(not null)
1537 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1539 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1540 self.callsite
= callsite
1542 var args
= self.n_args
.to_a
1543 if args
.length
> 0 then
1544 callsite
.check_signature
(v
, args
)
1546 # Check there is at least enough parameters
1547 if mpropdef
.msignature
.arity
< msignature
.arity
then
1548 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1551 # Check that each needed parameter is conform
1553 for sp
in msignature
.mparameters
do
1554 var p
= mpropdef
.msignature
.mparameters
[i
]
1555 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1556 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1563 self.is_typed
= true
1569 redef class ANewExpr
1570 # The constructor invoked by the new.
1571 var callsite
: nullable CallSite
1573 redef fun accept_typing
(v
)
1575 var recvtype
= v
.resolve_mtype
(self.n_type
)
1576 if recvtype
== null then return
1577 self.mtype
= recvtype
1579 if not recvtype
isa MClassType then
1580 if recvtype
isa MNullableType then
1581 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1584 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1588 if recvtype
.mclass
.kind
== abstract_kind
then
1589 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1591 else if recvtype
.mclass
.kind
== interface_kind
then
1592 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1604 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1605 if callsite
== null then return
1607 self.callsite
= callsite
1609 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1610 v
.error
(self, "Error: {name} is not a constructor.")
1614 var args
= n_args
.to_a
1615 callsite
.check_signature
(v
, args
)
1621 redef class AAttrFormExpr
1622 # The attribute acceded.
1623 var mproperty
: nullable MAttribute
1625 # The static type of the attribute.
1626 var attr_type
: nullable MType
1628 # Resolve the attribute acceded.
1629 private fun resolve_property
(v
: TypeVisitor)
1631 var recvtype
= v
.visit_expr
(self.n_expr
)
1632 if recvtype
== null then return # Skip error
1633 var name
= self.n_id
.text
1634 if recvtype
isa MNullType then
1635 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1639 var unsafe_type
= v
.anchor_to
(recvtype
)
1640 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1641 if mproperty
== null then
1642 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1645 assert mproperty
isa MAttribute
1646 self.mproperty
= mproperty
1648 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1649 assert mpropdefs
.length
== 1
1650 var mpropdef
= mpropdefs
.first
1651 var attr_type
= mpropdef
.static_mtype
.as(not null)
1652 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1653 self.attr_type
= attr_type
1657 redef class AAttrExpr
1658 redef fun accept_typing
(v
)
1660 self.resolve_property
(v
)
1661 self.mtype
= self.attr_type
1666 redef class AAttrAssignExpr
1667 redef fun accept_typing
(v
)
1669 self.resolve_property
(v
)
1670 var mtype
= self.attr_type
1672 v
.visit_expr_subtype
(self.n_value
, mtype
)
1673 self.is_typed
= true
1677 redef class AAttrReassignExpr
1678 redef fun accept_typing
(v
)
1680 self.resolve_property
(v
)
1681 var mtype
= self.attr_type
1682 if mtype
== null then return # Skip error
1684 self.resolve_reassignment
(v
, mtype
, mtype
)
1686 self.is_typed
= true
1690 redef class AIssetAttrExpr
1691 redef fun accept_typing
(v
)
1693 self.resolve_property
(v
)
1694 var mtype
= self.attr_type
1695 if mtype
== null then return # Skip error
1697 var recvtype
= self.n_expr
.mtype
.as(not null)
1698 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1699 if bound
isa MNullableType then
1700 v
.error
(self, "Error: isset on a nullable attribute.")
1702 self.mtype
= v
.type_bool
(self)
1708 redef class ADebugTypeExpr
1709 redef fun accept_typing
(v
)
1711 var expr
= v
.visit_expr
(self.n_expr
)
1712 if expr
== null then return
1713 var unsafe
= v
.anchor_to
(expr
)
1714 var ntype
= self.n_type
1715 var mtype
= v
.resolve_mtype
(ntype
)
1716 if mtype
!= null and mtype
!= expr
then
1717 var umtype
= v
.anchor_to
(mtype
)
1718 v
.modelbuilder
.warning
(self, "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1720 self.is_typed
= true