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
) 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
then
256 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
258 if not recv_is_self
and mproperty
.is_toplevel
then
259 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
262 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
263 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
267 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
269 if propdefs
.length
== 0 then
270 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
272 else if propdefs
.length
== 1 then
273 mpropdef
= propdefs
.first
275 self.modelbuilder
.warning
(node
, "Warning: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
276 mpropdef
= mproperty
.intro
280 var msignature
= mpropdef
.msignature
.as(not null)
281 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
283 var erasure_cast
= false
284 var rettype
= mpropdef
.msignature
.return_mtype
285 if not recv_is_self
and rettype
!= null then
286 rettype
= rettype
.as_notnullable
287 if rettype
isa MParameterType then
288 var erased_rettype
= msignature
.return_mtype
289 assert erased_rettype
!= null
290 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
295 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
299 # Visit the expressions of args and cheik their conformity with the corresponding typi in signature
300 # The point of this method is to handle varargs correctly
301 # Note: The signature must be correctly adapted
302 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
304 var vararg_rank
= msignature
.vararg_rank
305 if vararg_rank
>= 0 then
306 if args
.length
< msignature
.arity
then
307 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
308 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
311 else if args
.length
!= msignature
.arity
then
312 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
316 #debug("CALL {unsafe_type}.{msignature}")
318 var vararg_decl
= args
.length
- msignature
.arity
319 for i
in [0..msignature
.arity
[ do
321 if i
== vararg_rank
then continue # skip the vararg
322 if i
> vararg_rank
then
325 var paramtype
= msignature
.mparameters
[i
].mtype
326 self.visit_expr_subtype
(args
[j
], paramtype
)
328 if vararg_rank
>= 0 then
329 var varargs
= new Array[AExpr]
330 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
331 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
333 self.visit_expr_subtype
(args
[j
], paramtype
)
339 fun error
(node
: ANode, message
: String)
341 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
344 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
346 var flow
= node
.after_flow_context
348 self.error
(node
, "No context!")
352 if flow
.vars
.has_key
(variable
) then
353 return flow
.vars
[variable
]
355 #node.debug("*** START Collected for {variable}")
356 var mtypes
= flow
.collect_types
(variable
)
357 #node.debug("**** END Collected for {variable}")
358 if mtypes
== null or mtypes
.length
== 0 then
359 return variable
.declared_type
360 else if mtypes
.length
== 1 then
363 var res
= merge_types
(node
,mtypes
)
364 if res
== null then res
= variable
.declared_type
370 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
372 var flow
= node
.after_flow_context
375 flow
.set_var
(variable
, mtype
)
378 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
380 if col
.length
== 1 then return col
.first
381 var res
= new Array[nullable MType]
383 if t1
== null then continue # return null
386 if t2
== null then continue # return null
387 if t2
isa MNullableType or t2
isa MNullType then
390 if not is_subtype
(t2
, t1
) then found
= false
393 #print "merge {col.join(" ")} -> {t1}"
397 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
402 # A specific method call site with its associated informations.
404 # The assiciated node for location
407 # The static type of the receiver (possibly unresolved)
410 # The module where the callsite is present
413 # The anchor to use with `recv` or `msignature`
414 var anchor
: nullable MClassType
416 # Is the receiver self?
417 # If "for_self", virtual types of the signature are keeped
418 # If "not_for_self", virtual type are erased
419 var recv_is_self
: Bool
421 # The designated method
422 var mproperty
: MMethod
424 # The statically designated method definition
425 # The most specif one, it is.
426 var mpropdef
: MMethodDef
428 # The resolved signature for the receiver
429 var msignature
: MSignature
431 # Is a implicit cast required on erasure typing policy?
432 var erasure_cast
: Bool
434 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
436 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
441 # The declared type of the variable
442 var declared_type
: nullable MType
445 redef class FlowContext
446 # Store changes of types because of type evolution
447 private var vars
: HashMap[Variable, nullable MType] = new HashMap[Variable, nullable MType]
448 private var cache
: HashMap[Variable, nullable Array[nullable MType]] = new HashMap[Variable, nullable Array[nullable MType]]
450 # Adapt the variable to a static type
451 # Warning1: do not modify vars directly.
452 # Warning2: sub-flow may have cached a unadapted variabial
453 private fun set_var
(variable
: Variable, mtype
: nullable MType)
455 self.vars
[variable
] = mtype
456 self.cache
.keys
.remove
(variable
)
459 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
461 if cache
.has_key
(variable
) then
462 return cache
[variable
]
464 var res
: nullable Array[nullable MType] = null
465 if vars
.has_key
(variable
) then
466 var mtype
= vars
[variable
]
468 else if self.previous
.is_empty
then
470 res
= [variable
.declared_type
]
472 for flow
in self.previous
do
473 if flow
.is_unreachable
then continue
474 var r2
= flow
.collect_types
(variable
)
475 if r2
== null then continue
480 if not res
.has
(t
) then res
.add
(t
)
485 cache
[variable
] = res
491 # The entry point of the whole typing analysis
492 fun do_typing
(modelbuilder
: ModelBuilder)
496 # The variable associated to the reciever (if any)
497 var selfvariable
: nullable Variable
500 redef class AMethPropdef
501 redef fun do_typing
(modelbuilder
: ModelBuilder)
503 var nblock
= self.n_block
504 if nblock
== null then return
506 var mpropdef
= self.mpropdef
.as(not null)
507 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
508 self.selfvariable
= v
.selfvariable
510 var mmethoddef
= self.mpropdef
.as(not null)
511 for i
in [0..mmethoddef
.msignature
.arity
[ do
512 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
513 if mmethoddef
.msignature
.vararg_rank
== i
then
514 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
515 if arrayclass
== null then return # Skip error
516 mtype
= arrayclass
.get_mtype
([mtype
])
518 var variable
= self.n_signature
.n_params
[i
].variable
519 assert variable
!= null
520 variable
.declared_type
= mtype
524 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
525 # We reach the end of the function without having a return, it is bad
526 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
531 redef class AAttrPropdef
532 redef fun do_typing
(modelbuilder
: ModelBuilder)
534 var mpropdef
= self.mpropdef
.as(not null)
535 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
536 self.selfvariable
= v
.selfvariable
538 var nexpr
= self.n_expr
539 if nexpr
!= null then
540 var mtype
= self.mpropdef
.static_mtype
541 v
.visit_expr_subtype
(nexpr
, mtype
)
549 # The static type of the expression.
550 # null if self is a statement or in case of error
551 var mtype
: nullable MType = null
553 # Is the statement correctly typed?
554 # Used to distinguish errors and statements when `mtype == null`
555 var is_typed
: Bool = false
557 # If required, the following implicit cast `.as(XXX)`
558 # Such a cast may by required after evaluating the expression when
559 # a unsafe operation is detected (silently accepted by the Nit language).
560 # The attribute is computed by `check_subtype`
561 var implicit_cast_to
: nullable MType = null
563 # Return the variable read (if any)
564 # Used to perform adaptive typing
565 fun its_variable
: nullable Variable do return null
567 private fun accept_typing
(v
: TypeVisitor)
569 v
.error
(self, "no implemented accept_typing for {self.class_name}")
573 redef class ABlockExpr
574 redef fun accept_typing
(v
)
576 for e
in self.n_expr
do v
.visit_stmt
(e
)
580 # The type of a blockexpr is the one of the last expression (or null if empty)
583 if self.n_expr
.is_empty
then return null
584 return self.n_expr
.last
.mtype
588 redef class AVardeclExpr
589 redef fun accept_typing
(v
)
591 var variable
= self.variable
592 if variable
== null then return # Skip error
594 var ntype
= self.n_type
595 var mtype
: nullable MType
596 if ntype
== null then
599 mtype
= v
.resolve_mtype
(ntype
)
600 if mtype
== null then return # Skip error
603 var nexpr
= self.n_expr
604 if nexpr
!= null then
605 if mtype
!= null then
606 v
.visit_expr_subtype
(nexpr
, mtype
)
608 mtype
= v
.visit_expr
(nexpr
)
609 if mtype
== null then return # Skip error
614 if mtype
== null or mtype
isa MNullType then
615 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
616 if mtype
== null then mtype
= decltype
619 variable
.declared_type
= decltype
620 v
.set_variable
(self, variable
, mtype
)
622 #debug("var {variable}: {mtype}")
629 redef fun its_variable
do return self.variable
630 redef fun accept_typing
(v
)
632 var variable
= self.variable
633 if variable
== null then return # Skip error
635 var mtype
= v
.get_variable
(self, variable
)
636 if mtype
!= null then
637 #debug("{variable} is {mtype}")
639 #debug("{variable} is untyped")
646 redef class AVarAssignExpr
647 redef fun accept_typing
(v
)
649 var variable
= self.variable
650 assert variable
!= null
652 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
654 v
.set_variable
(self, variable
, mtype
)
660 redef class AReassignFormExpr
661 # The method designed by the reassign operator.
662 var reassign_callsite
: nullable CallSite
664 var read_type
: nullable MType = null
666 # Determine the `reassign_property`
667 # `readtype` is the type of the reading of the left value.
668 # `writetype` is the type of the writing of the left value.
669 # (Because of `ACallReassignExpr`, both can be different.
670 # Return the static type of the value to store.
671 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
673 var reassign_name
: String
674 if self.n_assign_op
isa APlusAssignOp then
676 else if self.n_assign_op
isa AMinusAssignOp then
682 self.read_type
= readtype
684 if readtype
isa MNullType then
685 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
689 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
690 if callsite
== null then return null # Skip error
691 self.reassign_callsite
= callsite
693 var msignature
= callsite
.msignature
694 var rettype
= msignature
.return_mtype
695 assert msignature
.arity
== 1 and rettype
!= null
697 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
698 if value_type
== null then return null # Skip error
700 v
.check_subtype
(self, rettype
, writetype
)
705 redef class AVarReassignExpr
706 redef fun accept_typing
(v
)
708 var variable
= self.variable
709 assert variable
!= null
711 var readtype
= v
.get_variable
(self, variable
)
712 if readtype
== null then return
716 var writetype
= variable
.declared_type
717 if writetype
== null then return
719 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
721 v
.set_variable
(self, variable
, rettype
)
728 redef class AContinueExpr
729 redef fun accept_typing
(v
)
731 var nexpr
= self.n_expr
732 if nexpr
!= null then
733 var mtype
= v
.visit_expr
(nexpr
)
739 redef class ABreakExpr
740 redef fun accept_typing
(v
)
742 var nexpr
= self.n_expr
743 if nexpr
!= null then
744 var mtype
= v
.visit_expr
(nexpr
)
750 redef class AReturnExpr
751 redef fun accept_typing
(v
)
753 var nexpr
= self.n_expr
754 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
755 if nexpr
!= null then
756 if ret_type
!= null then
757 var mtype
= v
.visit_expr_subtype
(nexpr
, ret_type
)
759 var mtype
= v
.visit_expr
(nexpr
)
760 v
.error
(self, "Error: Return with value in a procedure.")
762 else if ret_type
!= null then
763 v
.error
(self, "Error: Return without value in a function.")
769 redef class AAbortExpr
770 redef fun accept_typing
(v
)
777 redef fun accept_typing
(v
)
779 v
.visit_expr_bool
(n_expr
)
787 redef class AIfexprExpr
788 redef fun accept_typing
(v
)
790 v
.visit_expr_bool
(n_expr
)
792 var t1
= v
.visit_expr
(n_then
)
793 var t2
= v
.visit_expr
(n_else
)
795 if t1
== null or t2
== null then
799 var t
= v
.merge_types
(self, [t1
, t2
])
801 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
808 redef fun accept_typing
(v
)
810 v
.visit_stmt
(n_block
)
815 redef class AWhileExpr
816 redef fun accept_typing
(v
)
818 v
.visit_expr_bool
(n_expr
)
820 v
.visit_stmt
(n_block
)
825 redef class ALoopExpr
826 redef fun accept_typing
(v
)
828 v
.visit_stmt
(n_block
)
834 var coltype
: nullable MClassType
836 var method_iterator
: nullable CallSite
837 var method_is_ok
: nullable CallSite
838 var method_item
: nullable CallSite
839 var method_next
: nullable CallSite
840 var method_key
: nullable CallSite
842 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
844 if mtype
isa MNullType then
845 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
850 var objcla
= v
.get_mclass
(self, "Object")
851 if objcla
== null then return
853 # check iterator method
854 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
855 if itdef
== null then
856 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
859 self.method_iterator
= itdef
861 # check that iterator return something
862 var ittype
= itdef
.msignature
.return_mtype
863 if ittype
== null then
864 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
869 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
870 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
874 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
876 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
877 var variables
= self.variables
878 if variables
.length
!= 1 then
879 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
881 variables
.first
.declared_type
= coltype
.arguments
.first
886 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
888 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
889 var variables
= self.variables
890 if variables
.length
!= 2 then
891 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
893 variables
[0].declared_type
= coltype
.arguments
[0]
894 variables
[1].declared_type
= coltype
.arguments
[1]
899 if not is_col
and not is_map
then
900 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
904 # anchor formal and virtual types
905 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
907 mtype
= mtype
.as_notnullable
908 self.coltype
= mtype
.as(MClassType)
910 # get methods is_ok, next, item
911 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
912 if ikdef
== null then
913 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
916 self.method_is_ok
= ikdef
918 var itemdef
= v
.get_method
(self, ittype
, "item", false)
919 if itemdef
== null then
920 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
923 self.method_item
= itemdef
925 var nextdef
= v
.get_method
(self, ittype
, "next", false)
926 if nextdef
== null then
927 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
930 self.method_next
= nextdef
933 var keydef
= v
.get_method
(self, ittype
, "key", false)
934 if keydef
== null then
935 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
938 self.method_key
= keydef
942 redef fun accept_typing
(v
)
944 var mtype
= v
.visit_expr
(n_expr
)
945 if mtype
== null then return
947 self.do_type_iterator
(v
, mtype
)
949 v
.visit_stmt
(n_block
)
954 redef class AAssertExpr
955 redef fun accept_typing
(v
)
957 v
.visit_expr_bool
(n_expr
)
965 redef fun accept_typing
(v
)
967 v
.visit_expr_bool
(n_expr
)
968 v
.visit_expr_bool
(n_expr2
)
969 self.mtype
= v
.type_bool
(self)
973 redef class AImpliesExpr
974 redef fun accept_typing
(v
)
976 v
.visit_expr_bool
(n_expr
)
977 v
.visit_expr_bool
(n_expr2
)
978 self.mtype
= v
.type_bool
(self)
983 redef fun accept_typing
(v
)
985 v
.visit_expr_bool
(n_expr
)
986 v
.visit_expr_bool
(n_expr2
)
987 self.mtype
= v
.type_bool
(self)
993 redef fun accept_typing
(v
)
995 v
.visit_expr_bool
(n_expr
)
996 self.mtype
= v
.type_bool
(self)
1000 redef class AOrElseExpr
1001 redef fun accept_typing
(v
)
1003 var t1
= v
.visit_expr
(n_expr
)
1004 var t2
= v
.visit_expr
(n_expr2
)
1006 if t1
== null or t2
== null then
1010 t1
= t1
.as_notnullable
1012 var t
= v
.merge_types
(self, [t1
, t2
])
1014 t
= v
.mmodule
.object_type
1015 if t2
isa MNullableType then
1018 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1024 redef class ATrueExpr
1025 redef fun accept_typing
(v
)
1027 self.mtype
= v
.type_bool
(self)
1031 redef class AFalseExpr
1032 redef fun accept_typing
(v
)
1034 self.mtype
= v
.type_bool
(self)
1038 redef class AIntExpr
1039 redef fun accept_typing
(v
)
1041 var mclass
= v
.get_mclass
(self, "Int")
1042 if mclass
== null then return # Forward error
1043 self.mtype
= mclass
.mclass_type
1047 redef class AFloatExpr
1048 redef fun accept_typing
(v
)
1050 var mclass
= v
.get_mclass
(self, "Float")
1051 if mclass
== null then return # Forward error
1052 self.mtype
= mclass
.mclass_type
1056 redef class ACharExpr
1057 redef fun accept_typing
(v
)
1059 var mclass
= v
.get_mclass
(self, "Char")
1060 if mclass
== null then return # Forward error
1061 self.mtype
= mclass
.mclass_type
1065 redef class AStringFormExpr
1066 redef fun accept_typing
(v
)
1068 var mclass
= v
.get_mclass
(self, "String")
1069 if mclass
== null then return # Forward error
1070 self.mtype
= mclass
.mclass_type
1074 redef class ASuperstringExpr
1075 redef fun accept_typing
(v
)
1077 var mclass
= v
.get_mclass
(self, "String")
1078 if mclass
== null then return # Forward error
1079 self.mtype
= mclass
.mclass_type
1080 for nexpr
in self.n_exprs
do
1081 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1086 redef class AArrayExpr
1087 var with_capacity_callsite
: nullable CallSite
1088 var push_callsite
: nullable CallSite
1090 redef fun accept_typing
(v
)
1092 var mtypes
= new Array[nullable MType]
1093 for e
in self.n_exprs
.n_exprs
do
1094 var t
= v
.visit_expr
(e
)
1100 var mtype
= v
.merge_types
(self, mtypes
)
1101 if mtype
== null then
1102 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1105 var mclass
= v
.get_mclass
(self, "Array")
1106 if mclass
== null then return # Forward error
1107 var array_mtype
= mclass
.get_mtype
([mtype
])
1109 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1110 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1112 self.mtype
= array_mtype
1116 redef class ARangeExpr
1117 var init_callsite
: nullable CallSite
1119 redef fun accept_typing
(v
)
1121 var discrete_class
= v
.get_mclass
(self, "Discrete")
1122 if discrete_class
== null then return # Forward error
1123 var discrete_type
= discrete_class
.intro
.bound_mtype
1124 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1125 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1126 if t1
== null or t2
== null then return
1127 var mclass
= v
.get_mclass
(self, "Range")
1128 if mclass
== null then return # Forward error
1130 if v
.is_subtype
(t1
, t2
) then
1131 mtype
= mclass
.get_mtype
([t2
])
1132 else if v
.is_subtype
(t2
, t1
) then
1133 mtype
= mclass
.get_mtype
([t1
])
1135 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1141 # get the constructor
1143 if self isa ACrangeExpr then
1144 callsite
= v
.get_method
(self, mtype
, "init", false)
1145 else if self isa AOrangeExpr then
1146 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1150 init_callsite
= callsite
1154 redef class ANullExpr
1155 redef fun accept_typing
(v
)
1157 self.mtype
= v
.mmodule
.model
.null_type
1161 redef class AIsaExpr
1162 # The static type to cast to.
1163 # (different from the static type of the expression that is `Bool`).
1164 var cast_type
: nullable MType
1165 redef fun accept_typing
(v
)
1167 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1168 self.cast_type
= mtype
1170 var variable
= self.n_expr
.its_variable
1171 if variable
!= null then
1172 var orig
= self.n_expr
.mtype
1173 var from
= if orig
!= null then orig
.to_s
else "invalid"
1174 var to
= if mtype
!= null then mtype
.to_s
else "invalid"
1175 #debug("adapt {variable}: {from} -> {to}")
1176 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1179 self.mtype
= v
.type_bool
(self)
1183 redef class AAsCastExpr
1184 redef fun accept_typing
(v
)
1186 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1190 redef class AAsNotnullExpr
1191 redef fun accept_typing
(v
)
1193 var mtype
= v
.visit_expr
(self.n_expr
)
1194 if mtype
== null then return # Forward error
1196 if mtype
isa MNullType then
1197 v
.error
(self, "Type error: as(not null) on null")
1200 if mtype
isa MNullableType then
1201 self.mtype
= mtype
.mtype
1206 if mtype
isa MClassType then
1207 v
.modelbuilder
.warning
(self, "Warning: expression is already not null, since it is a `{mtype}`.")
1210 assert mtype
.need_anchor
1211 var u
= v
.anchor_to
(mtype
)
1212 if not u
isa MNullableType then
1213 v
.modelbuilder
.warning
(self, "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1219 redef class AProxyExpr
1220 redef fun accept_typing
(v
)
1222 self.mtype
= v
.visit_expr
(self.n_expr
)
1226 redef class ASelfExpr
1227 redef var its_variable
: nullable Variable
1228 redef fun accept_typing
(v
)
1230 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1231 v
.error
(self, "Error: self cannot be used in top-level method.")
1233 var variable
= v
.selfvariable
1234 self.its_variable
= variable
1235 self.mtype
= v
.get_variable
(self, variable
)
1239 ## MESSAGE SENDING AND PROPERTY
1241 redef class ASendExpr
1242 # The property invoked by the send.
1243 var callsite
: nullable CallSite
1245 redef fun accept_typing
(v
)
1247 var recvtype
= v
.visit_expr
(self.n_expr
)
1248 var name
= self.property_name
1250 if recvtype
== null then return # Forward error
1251 if recvtype
isa MNullType then
1252 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1256 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1257 if callsite
== null then return
1258 self.callsite
= callsite
1259 var msignature
= callsite
.msignature
1261 var args
= compute_raw_arguments
1263 callsite
.check_signature
(v
, args
)
1265 if callsite
.mproperty
.is_init
then
1266 var vmpropdef
= v
.mpropdef
1267 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1268 v
.error
(self, "Can call a init only in another init")
1272 var ret
= msignature
.return_mtype
1276 self.is_typed
= true
1280 # The name of the property
1281 # Each subclass simply provide the correct name.
1282 private fun property_name
: String is abstract
1284 # An array of all arguments (excluding self)
1285 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1287 private fun compute_raw_arguments
: Array[AExpr] is abstract
1290 redef class ABinopExpr
1291 redef fun compute_raw_arguments
do return [n_expr2
]
1294 redef fun property_name
do return "=="
1295 redef fun accept_typing
(v
)
1299 var variable
= self.n_expr
.its_variable
1300 if variable
== null then return
1301 var mtype
= self.n_expr2
.mtype
1302 if not mtype
isa MNullType then return
1303 var vartype
= v
.get_variable
(self, variable
)
1304 if not vartype
isa MNullableType then return
1305 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1306 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1307 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
1311 redef fun property_name
do return "!="
1312 redef fun accept_typing
(v
)
1316 var variable
= self.n_expr
.its_variable
1317 if variable
== null then return
1318 var mtype
= self.n_expr2
.mtype
1319 if not mtype
isa MNullType then return
1320 var vartype
= v
.get_variable
(self, variable
)
1321 if not vartype
isa MNullableType then return
1322 self.after_flow_context
.when_false
.set_var
(variable
, mtype
)
1323 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1324 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1328 redef fun property_name
do return "<"
1331 redef fun property_name
do return "<="
1334 redef fun property_name
do return "<<"
1337 redef fun property_name
do return ">"
1340 redef fun property_name
do return ">="
1343 redef fun property_name
do return ">>"
1345 redef class APlusExpr
1346 redef fun property_name
do return "+"
1348 redef class AMinusExpr
1349 redef fun property_name
do return "-"
1351 redef class AStarshipExpr
1352 redef fun property_name
do return "<=>"
1354 redef class AStarExpr
1355 redef fun property_name
do return "*"
1357 redef class ASlashExpr
1358 redef fun property_name
do return "/"
1360 redef class APercentExpr
1361 redef fun property_name
do return "%"
1364 redef class AUminusExpr
1365 redef fun property_name
do return "unary -"
1366 redef fun compute_raw_arguments
do return new Array[AExpr]
1370 redef class ACallExpr
1371 redef fun property_name
do return n_id
.text
1372 redef fun compute_raw_arguments
do return n_args
.to_a
1375 redef class ACallAssignExpr
1376 redef fun property_name
do return n_id
.text
+ "="
1377 redef fun compute_raw_arguments
1379 var res
= n_args
.to_a
1385 redef class ABraExpr
1386 redef fun property_name
do return "[]"
1387 redef fun compute_raw_arguments
do return n_args
.to_a
1390 redef class ABraAssignExpr
1391 redef fun property_name
do return "[]="
1392 redef fun compute_raw_arguments
1394 var res
= n_args
.to_a
1400 redef class ASendReassignFormExpr
1401 # The property invoked for the writing
1402 var write_callsite
: nullable CallSite
1404 redef fun accept_typing
(v
)
1406 var recvtype
= v
.visit_expr
(self.n_expr
)
1407 var name
= self.property_name
1409 if recvtype
== null then return # Forward error
1410 if recvtype
isa MNullType then
1411 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1415 var for_self
= self.n_expr
isa ASelfExpr
1416 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1418 if callsite
== null then return
1419 self.callsite
= callsite
1421 var args
= compute_raw_arguments
1423 callsite
.check_signature
(v
, args
)
1425 var readtype
= callsite
.msignature
.return_mtype
1426 if readtype
== null then
1427 v
.error
(self, "Error: {name} is not a function")
1431 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1432 if wcallsite
== null then return
1433 self.write_callsite
= wcallsite
1435 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1436 if wtype
== null then return
1438 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1439 args
.add
(self.n_value
)
1440 wcallsite
.check_signature
(v
, args
)
1442 self.is_typed
= true
1446 redef class ACallReassignExpr
1447 redef fun property_name
do return n_id
.text
1448 redef fun compute_raw_arguments
do return n_args
.to_a
1451 redef class ABraReassignExpr
1452 redef fun property_name
do return "[]"
1453 redef fun compute_raw_arguments
do return n_args
.to_a
1456 redef class AInitExpr
1457 redef fun property_name
do return "init"
1458 redef fun compute_raw_arguments
do return n_args
.to_a
1462 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1467 redef class ASuperExpr
1468 # The method to call if the super is in fact a 'super init call'
1469 # Note: if the super is a normal call-next-method, then this attribute is null
1470 var callsite
: nullable CallSite
1472 # The method to call is the super is a standard `call-next-method` super-call
1473 # Note: if the super is a special super-init-call, then this attribute is null
1474 var mpropdef
: nullable MMethodDef
1476 redef fun accept_typing
(v
)
1478 var recvtype
= v
.anchor
1479 assert recvtype
!= null
1480 var mproperty
= v
.mpropdef
.mproperty
1481 if not mproperty
isa MMethod then
1482 v
.error
(self, "Error: super only usable in a method")
1485 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, recvtype
)
1486 if superprops
.length
== 0 then
1487 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1488 process_superinit
(v
)
1491 v
.error
(self, "Error: No super method to call for {mproperty}.")
1494 # FIXME: covariance of return type in linear extension?
1495 var superprop
= superprops
.first
1497 var msignature
= superprop
.msignature
.as(not null)
1498 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1499 var args
= self.n_args
.to_a
1500 if args
.length
> 0 then
1501 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1503 self.mtype
= msignature
.return_mtype
1504 self.is_typed
= true
1505 v
.mpropdef
.has_supercall
= true
1506 mpropdef
= v
.mpropdef
.as(MMethodDef)
1509 private fun process_superinit
(v
: TypeVisitor)
1511 var recvtype
= v
.anchor
1512 assert recvtype
!= null
1513 var mpropdef
= v
.mpropdef
1514 assert mpropdef
isa MMethodDef
1515 var mproperty
= mpropdef
.mproperty
1516 var superprop
: nullable MMethodDef = null
1517 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1518 msupertype
= msupertype
.anchor_to
(v
.mmodule
, recvtype
)
1519 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1520 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1521 if candidate
== null then
1522 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forard error
1523 continue # Try next super-class
1525 if superprop
!= null and superprop
.mproperty
!= candidate
then
1526 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1529 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, recvtype
)
1530 if superprop
!= null then
1531 if superprop
== candidatedefs
.first
then continue
1532 candidatedefs
.add
(superprop
)
1534 if candidatedefs
.length
> 1 then
1535 v
.error
(self, "Error: confliting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1538 superprop
= candidatedefs
.first
1540 if superprop
== null then
1541 v
.error
(self, "Error: No super method to call for {mproperty}.")
1545 var msignature
= superprop
.msignature
.as(not null)
1546 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1548 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1549 self.callsite
= callsite
1551 var args
= self.n_args
.to_a
1552 if args
.length
> 0 then
1553 callsite
.check_signature
(v
, args
)
1555 # Check there is at least enough parameters
1556 if mpropdef
.msignature
.arity
< msignature
.arity
then
1557 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1560 # Check that each needed parameter is conform
1562 for sp
in msignature
.mparameters
do
1563 var p
= mpropdef
.msignature
.mparameters
[i
]
1564 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1565 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1572 self.is_typed
= true
1578 redef class ANewExpr
1579 # The constructor invoked by the new.
1580 var callsite
: nullable CallSite
1582 redef fun accept_typing
(v
)
1584 var recvtype
= v
.resolve_mtype
(self.n_type
)
1585 if recvtype
== null then return
1586 self.mtype
= recvtype
1588 if not recvtype
isa MClassType then
1589 if recvtype
isa MNullableType then
1590 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1593 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1597 if recvtype
.mclass
.kind
== abstract_kind
then
1598 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1600 else if recvtype
.mclass
.kind
== interface_kind
then
1601 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1613 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1614 if callsite
== null then return
1616 self.callsite
= callsite
1618 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1619 v
.error
(self, "Error: {name} is not a constructor.")
1623 var args
= n_args
.to_a
1624 callsite
.check_signature
(v
, args
)
1630 redef class AAttrFormExpr
1631 # The attribute acceded.
1632 var mproperty
: nullable MAttribute
1634 # The static type of the attribute.
1635 var attr_type
: nullable MType
1637 # Resolve the attribute acceded.
1638 private fun resolve_property
(v
: TypeVisitor)
1640 var recvtype
= v
.visit_expr
(self.n_expr
)
1641 if recvtype
== null then return # Skip error
1642 var name
= self.n_id
.text
1643 if recvtype
isa MNullType then
1644 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1648 var unsafe_type
= v
.anchor_to
(recvtype
)
1649 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1650 if mproperty
== null then
1651 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1654 assert mproperty
isa MAttribute
1655 self.mproperty
= mproperty
1657 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1658 assert mpropdefs
.length
== 1
1659 var mpropdef
= mpropdefs
.first
1660 var attr_type
= mpropdef
.static_mtype
.as(not null)
1661 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1662 self.attr_type
= attr_type
1666 redef class AAttrExpr
1667 redef fun accept_typing
(v
)
1669 self.resolve_property
(v
)
1670 self.mtype
= self.attr_type
1675 redef class AAttrAssignExpr
1676 redef fun accept_typing
(v
)
1678 self.resolve_property
(v
)
1679 var mtype
= self.attr_type
1681 v
.visit_expr_subtype
(self.n_value
, mtype
)
1682 self.is_typed
= true
1686 redef class AAttrReassignExpr
1687 redef fun accept_typing
(v
)
1689 self.resolve_property
(v
)
1690 var mtype
= self.attr_type
1691 if mtype
== null then return # Skip error
1693 self.resolve_reassignment
(v
, mtype
, mtype
)
1695 self.is_typed
= true
1699 redef class AIssetAttrExpr
1700 redef fun accept_typing
(v
)
1702 self.resolve_property
(v
)
1703 var mtype
= self.attr_type
1704 if mtype
== null then return # Skip error
1706 var recvtype
= self.n_expr
.mtype
.as(not null)
1707 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1708 if bound
isa MNullableType then
1709 v
.error
(self, "Error: isset on a nullable attribute.")
1711 self.mtype
= v
.type_bool
(self)
1717 redef class ADebugTypeExpr
1718 redef fun accept_typing
(v
)
1720 var expr
= v
.visit_expr
(self.n_expr
)
1721 if expr
== null then return
1722 var unsafe
= v
.anchor_to
(expr
)
1723 var ntype
= self.n_type
1724 var mtype
= v
.resolve_mtype
(ntype
)
1725 if mtype
!= null and mtype
!= expr
then
1726 var umtype
= v
.anchor_to
(mtype
)
1727 v
.modelbuilder
.warning
(self, "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1729 self.is_typed
= true