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.
24 redef class ToolContext
25 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
28 private class TypingPhase
30 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
33 private class TypeVisitor
34 var modelbuilder
: ModelBuilder
36 # The module of the analysis
37 # Used to correctly query the model
40 # The static type of the receiver
41 # Mainly used for type tests and type resolutions
42 var anchor
: nullable MClassType
44 # The analyzed mclassdef
45 var mclassdef
: nullable MClassDef
47 # The analyzed property
48 var mpropdef
: nullable MPropDef
50 var selfvariable
: Variable = new Variable("self")
52 # Is `self` use restricted?
53 # * no explicit `self`
54 # * method called on the implicit self must be top-level
55 var is_toplevel_context
= false
57 init(modelbuilder
: ModelBuilder, mmodule
: MModule, mpropdef
: nullable MPropDef)
59 self.modelbuilder
= modelbuilder
60 self.mmodule
= mmodule
62 if mpropdef
!= null then
63 self.mpropdef
= mpropdef
64 var mclassdef
= mpropdef
.mclassdef
65 self.mclassdef
= mclassdef
66 self.anchor
= mclassdef
.bound_mtype
68 var mclass
= mclassdef
.mclass
70 var selfvariable
= new Variable("self")
71 self.selfvariable
= selfvariable
72 selfvariable
.declared_type
= mclass
.mclass_type
74 var mprop
= mpropdef
.mproperty
75 if mprop
isa MMethod and mprop
.is_toplevel
then
76 is_toplevel_context
= true
81 fun anchor_to
(mtype
: MType): MType
84 if anchor
== null then
85 assert not mtype
.need_anchor
88 return mtype
.anchor_to
(mmodule
, anchor
)
91 fun is_subtype
(sub
, sup
: MType): Bool
93 return sub
.is_subtype
(mmodule
, anchor
, sup
)
96 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
98 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
99 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
103 # Check that `sub` is a subtype of `sup`.
104 # If `sub` is not a valud suptype, then display an error on `node` an return null.
105 # If `sub` is a safe subtype of `sup` then return `sub`.
106 # If `sub` is an insafe subtype (ie an imlicit cast is required), then return `sup`.
108 # The point of the return type is to determinate the usable type on an expression:
109 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
110 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
111 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
113 if self.is_subtype
(sub
, sup
) then return sub
114 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
115 # FIXME workarround to the current unsafe typing policy. To remove once fixed virtual types exists.
116 #node.debug("Unsafe typing: expected {sup}, got {sub}")
119 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
123 # Visit an expression and do not care about the return value
124 fun visit_stmt
(nexpr
: nullable AExpr)
126 if nexpr
== null then return
127 nexpr
.accept_typing
(self)
130 # Visit an expression and expects that it is not a statement
131 # Return the type of the expression
132 # Display an error and return null if:
133 # * the type cannot be determined or
134 # * `nexpr` is a statement
135 fun visit_expr
(nexpr
: AExpr): nullable MType
137 nexpr
.accept_typing
(self)
138 var mtype
= nexpr
.mtype
139 if mtype
!= null then return mtype
140 if not nexpr
.is_typed
then
141 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
142 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
143 nexpr
.debug
("No return type but no error.")
146 return null # forward error
148 self.error
(nexpr
, "Type error: expected expression.")
152 # Visit an expression and expect its static type is a least a `sup`
153 # Return the type of the expression or null if
154 # * the type cannot be determined or
155 # * `nexpr` is a statement or
156 # * `nexpr` is not a `sup`
157 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
159 var sub
= visit_expr
(nexpr
)
160 if sub
== null then return null # Forward error
162 if sup
== null then return null # Forward error
164 var res
= check_subtype
(nexpr
, sub
, sup
)
166 nexpr
.implicit_cast_to
= res
171 # Visit an expression and expect its static type is a `Bool`
172 # Return the type of the expression or null if
173 # * the type cannot be determined or
174 # * `nexpr` is a statement or
175 # * `nexpr` is not a `Bool`
176 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
178 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
182 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
184 var sub
= visit_expr
(nexpr
)
185 if sub
== null then return null # Forward error
187 var sup
= self.resolve_mtype
(ntype
)
188 if sup
== null then return null # Forward error
191 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup}.")
192 else if self.is_subtype
(sub
, sup
) then
193 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup} since it is a {sub}.")
198 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
200 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
203 fun resolve_mtype
(node
: AType): nullable MType
205 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
208 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
210 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
214 fun get_mclass
(node
: ANode, name
: String): nullable MClass
216 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
217 if mclass
== null then
218 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
223 fun type_bool
(node
: ANode): nullable MType
225 var mclass
= self.get_mclass
(node
, "Bool")
226 if mclass
== null then return null
227 return mclass
.mclass_type
230 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
232 var unsafe_type
= self.anchor_to
(recvtype
)
234 #debug("recv: {recvtype} (aka {unsafe_type})")
235 if recvtype
isa MNullType then
236 self.error
(node
, "Error: Method '{name}' call on 'null'.")
240 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
241 if mproperty
== null then
242 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
244 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
246 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
251 assert mproperty
isa MMethod
253 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
254 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
256 if not recv_is_self
and mproperty
.is_toplevel
then
257 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
260 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
261 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
265 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
267 if propdefs
.length
== 0 then
268 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
270 else if propdefs
.length
== 1 then
271 mpropdef
= propdefs
.first
273 self.modelbuilder
.warning
(node
, "Warning: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
274 mpropdef
= mproperty
.intro
278 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
279 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
281 var erasure_cast
= false
282 var rettype
= mpropdef
.msignature
.return_mtype
283 if not recv_is_self
and rettype
!= null then
284 rettype
= rettype
.as_notnullable
285 if rettype
isa MParameterType then
286 var erased_rettype
= msignature
.return_mtype
287 assert erased_rettype
!= null
288 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
293 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
297 # Visit the expressions of args and cheik their conformity with the corresponding typi in signature
298 # The point of this method is to handle varargs correctly
299 # Note: The signature must be correctly adapted
300 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
302 var vararg_rank
= msignature
.vararg_rank
303 if vararg_rank
>= 0 then
304 if args
.length
< msignature
.arity
then
305 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
306 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
309 else if args
.length
!= msignature
.arity
then
310 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
314 #debug("CALL {unsafe_type}.{msignature}")
316 var vararg_decl
= args
.length
- msignature
.arity
317 for i
in [0..msignature
.arity
[ do
319 if i
== vararg_rank
then continue # skip the vararg
320 if i
> vararg_rank
then
323 var paramtype
= msignature
.mparameters
[i
].mtype
324 self.visit_expr_subtype
(args
[j
], paramtype
)
326 if vararg_rank
>= 0 then
327 var varargs
= new Array[AExpr]
328 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
329 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
331 self.visit_expr_subtype
(args
[j
], paramtype
)
337 fun error
(node
: ANode, message
: String)
339 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
342 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
344 var flow
= node
.after_flow_context
346 self.error
(node
, "No context!")
350 if flow
.vars
.has_key
(variable
) then
351 return flow
.vars
[variable
]
353 #node.debug("*** START Collected for {variable}")
354 var mtypes
= flow
.collect_types
(variable
)
355 #node.debug("**** END Collected for {variable}")
356 if mtypes
== null or mtypes
.length
== 0 then
357 return variable
.declared_type
358 else if mtypes
.length
== 1 then
361 var res
= merge_types
(node
,mtypes
)
362 if res
== null then res
= variable
.declared_type
368 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
370 var flow
= node
.after_flow_context
373 flow
.set_var
(variable
, mtype
)
376 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
378 if col
.length
== 1 then return col
.first
379 var res
= new Array[nullable MType]
381 if t1
== null then continue # return null
384 if t2
== null then continue # return null
385 if t2
isa MNullableType or t2
isa MNullType then
388 if not is_subtype
(t2
, t1
) then found
= false
391 #print "merge {col.join(" ")} -> {t1}"
395 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
400 # A specific method call site with its associated informations.
402 # The assiciated node for location
405 # The static type of the receiver (possibly unresolved)
408 # The module where the callsite is present
411 # The anchor to use with `recv` or `msignature`
412 var anchor
: nullable MClassType
414 # Is the receiver self?
415 # If "for_self", virtual types of the signature are keeped
416 # If "not_for_self", virtual type are erased
417 var recv_is_self
: Bool
419 # The designated method
420 var mproperty
: MMethod
422 # The statically designated method definition
423 # The most specif one, it is.
424 var mpropdef
: MMethodDef
426 # The resolved signature for the receiver
427 var msignature
: MSignature
429 # Is a implicit cast required on erasure typing policy?
430 var erasure_cast
: Bool
432 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
434 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
439 # The declared type of the variable
440 var declared_type
: nullable MType
443 redef class FlowContext
444 # Store changes of types because of type evolution
445 private var vars
: HashMap[Variable, nullable MType] = new HashMap[Variable, nullable MType]
446 private var cache
: HashMap[Variable, nullable Array[nullable MType]] = new HashMap[Variable, nullable Array[nullable MType]]
448 # Adapt the variable to a static type
449 # Warning1: do not modify vars directly.
450 # Warning2: sub-flow may have cached a unadapted variabial
451 private fun set_var
(variable
: Variable, mtype
: nullable MType)
453 self.vars
[variable
] = mtype
454 self.cache
.keys
.remove
(variable
)
457 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
459 if cache
.has_key
(variable
) then
460 return cache
[variable
]
462 var res
: nullable Array[nullable MType] = null
463 if vars
.has_key
(variable
) then
464 var mtype
= vars
[variable
]
466 else if self.previous
.is_empty
then
468 res
= [variable
.declared_type
]
470 for flow
in self.previous
do
471 if flow
.is_unreachable
then continue
472 var r2
= flow
.collect_types
(variable
)
473 if r2
== null then continue
478 if not res
.has
(t
) then res
.add
(t
)
483 cache
[variable
] = res
489 # The entry point of the whole typing analysis
490 fun do_typing
(modelbuilder
: ModelBuilder)
494 # The variable associated to the reciever (if any)
495 var selfvariable
: nullable Variable
498 redef class AMethPropdef
499 redef fun do_typing
(modelbuilder
: ModelBuilder)
501 var nblock
= self.n_block
502 if nblock
== null then return
504 var mpropdef
= self.mpropdef
.as(not null)
505 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
506 self.selfvariable
= v
.selfvariable
508 var mmethoddef
= self.mpropdef
.as(not null)
509 for i
in [0..mmethoddef
.msignature
.arity
[ do
510 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
511 if mmethoddef
.msignature
.vararg_rank
== i
then
512 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
513 if arrayclass
== null then return # Skip error
514 mtype
= arrayclass
.get_mtype
([mtype
])
516 var variable
= self.n_signature
.n_params
[i
].variable
517 assert variable
!= null
518 variable
.declared_type
= mtype
522 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
523 # We reach the end of the function without having a return, it is bad
524 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
529 redef class AAttrPropdef
530 redef fun do_typing
(modelbuilder
: ModelBuilder)
532 var mpropdef
= self.mpropdef
.as(not null)
533 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
534 self.selfvariable
= v
.selfvariable
536 var nexpr
= self.n_expr
537 if nexpr
!= null then
538 var mtype
= self.mpropdef
.static_mtype
539 v
.visit_expr_subtype
(nexpr
, mtype
)
547 # The static type of the expression.
548 # null if self is a statement or in case of error
549 var mtype
: nullable MType = null
551 # Is the statement correctly typed?
552 # Used to distinguish errors and statements when `mtype == null`
553 var is_typed
: Bool = false
555 # If required, the following implicit cast `.as(XXX)`
556 # Such a cast may by required after evaluating the expression when
557 # a unsafe operation is detected (silently accepted by the Nit language).
558 # The attribute is computed by `check_subtype`
559 var implicit_cast_to
: nullable MType = null
561 # Return the variable read (if any)
562 # Used to perform adaptive typing
563 fun its_variable
: nullable Variable do return null
565 private fun accept_typing
(v
: TypeVisitor)
567 v
.error
(self, "no implemented accept_typing for {self.class_name}")
571 redef class ABlockExpr
572 redef fun accept_typing
(v
)
574 for e
in self.n_expr
do v
.visit_stmt
(e
)
578 # The type of a blockexpr is the one of the last expression (or null if empty)
581 if self.n_expr
.is_empty
then return null
582 return self.n_expr
.last
.mtype
586 redef class AVardeclExpr
587 redef fun accept_typing
(v
)
589 var variable
= self.variable
590 if variable
== null then return # Skip error
592 var ntype
= self.n_type
593 var mtype
: nullable MType
594 if ntype
== null then
597 mtype
= v
.resolve_mtype
(ntype
)
598 if mtype
== null then return # Skip error
601 var nexpr
= self.n_expr
602 if nexpr
!= null then
603 if mtype
!= null then
604 v
.visit_expr_subtype
(nexpr
, mtype
)
606 mtype
= v
.visit_expr
(nexpr
)
607 if mtype
== null then return # Skip error
612 if mtype
== null or mtype
isa MNullType then
613 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
614 if mtype
== null then mtype
= decltype
617 variable
.declared_type
= decltype
618 v
.set_variable
(self, variable
, mtype
)
620 #debug("var {variable}: {mtype}")
627 redef fun its_variable
do return self.variable
628 redef fun accept_typing
(v
)
630 var variable
= self.variable
631 if variable
== null then return # Skip error
633 var mtype
= v
.get_variable
(self, variable
)
634 if mtype
!= null then
635 #debug("{variable} is {mtype}")
637 #debug("{variable} is untyped")
644 redef class AVarAssignExpr
645 redef fun accept_typing
(v
)
647 var variable
= self.variable
648 assert variable
!= null
650 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
652 v
.set_variable
(self, variable
, mtype
)
658 redef class AReassignFormExpr
659 # The method designed by the reassign operator.
660 var reassign_callsite
: nullable CallSite
662 var read_type
: nullable MType = null
664 # Determine the `reassign_property`
665 # `readtype` is the type of the reading of the left value.
666 # `writetype` is the type of the writing of the left value.
667 # (Because of `ACallReassignExpr`, both can be different.
668 # Return the static type of the value to store.
669 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
671 var reassign_name
: String
672 if self.n_assign_op
isa APlusAssignOp then
674 else if self.n_assign_op
isa AMinusAssignOp then
680 self.read_type
= readtype
682 if readtype
isa MNullType then
683 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
687 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
688 if callsite
== null then return null # Skip error
689 self.reassign_callsite
= callsite
691 var msignature
= callsite
.msignature
692 var rettype
= msignature
.return_mtype
693 assert msignature
.arity
== 1 and rettype
!= null
695 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
696 if value_type
== null then return null # Skip error
698 v
.check_subtype
(self, rettype
, writetype
)
703 redef class AVarReassignExpr
704 redef fun accept_typing
(v
)
706 var variable
= self.variable
707 assert variable
!= null
709 var readtype
= v
.get_variable
(self, variable
)
710 if readtype
== null then return
714 var writetype
= variable
.declared_type
715 if writetype
== null then return
717 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
719 v
.set_variable
(self, variable
, rettype
)
726 redef class AContinueExpr
727 redef fun accept_typing
(v
)
729 var nexpr
= self.n_expr
730 if nexpr
!= null then
731 var mtype
= v
.visit_expr
(nexpr
)
737 redef class ABreakExpr
738 redef fun accept_typing
(v
)
740 var nexpr
= self.n_expr
741 if nexpr
!= null then
742 var mtype
= v
.visit_expr
(nexpr
)
748 redef class AReturnExpr
749 redef fun accept_typing
(v
)
751 var nexpr
= self.n_expr
752 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
753 if nexpr
!= null then
754 if ret_type
!= null then
755 var mtype
= v
.visit_expr_subtype
(nexpr
, ret_type
)
757 var mtype
= v
.visit_expr
(nexpr
)
758 v
.error
(self, "Error: Return with value in a procedure.")
760 else if ret_type
!= null then
761 v
.error
(self, "Error: Return without value in a function.")
767 redef class AAbortExpr
768 redef fun accept_typing
(v
)
775 redef fun accept_typing
(v
)
777 v
.visit_expr_bool
(n_expr
)
785 redef class AIfexprExpr
786 redef fun accept_typing
(v
)
788 v
.visit_expr_bool
(n_expr
)
790 var t1
= v
.visit_expr
(n_then
)
791 var t2
= v
.visit_expr
(n_else
)
793 if t1
== null or t2
== null then
797 var t
= v
.merge_types
(self, [t1
, t2
])
799 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
806 redef fun accept_typing
(v
)
808 v
.visit_stmt
(n_block
)
813 redef class AWhileExpr
814 redef fun accept_typing
(v
)
816 v
.visit_expr_bool
(n_expr
)
818 v
.visit_stmt
(n_block
)
823 redef class ALoopExpr
824 redef fun accept_typing
(v
)
826 v
.visit_stmt
(n_block
)
832 var coltype
: nullable MClassType
834 var method_iterator
: nullable CallSite
835 var method_is_ok
: nullable CallSite
836 var method_item
: nullable CallSite
837 var method_next
: nullable CallSite
838 var method_key
: nullable CallSite
840 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
842 if mtype
isa MNullType then
843 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
848 var objcla
= v
.get_mclass
(self, "Object")
849 if objcla
== null then return
851 # check iterator method
852 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
853 if itdef
== null then
854 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
857 self.method_iterator
= itdef
859 # check that iterator return something
860 var ittype
= itdef
.msignature
.return_mtype
861 if ittype
== null then
862 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
867 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
868 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
872 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
874 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
875 var variables
= self.variables
876 if variables
.length
!= 1 then
877 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
879 variables
.first
.declared_type
= coltype
.arguments
.first
884 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
886 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
887 var variables
= self.variables
888 if variables
.length
!= 2 then
889 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
891 variables
[0].declared_type
= coltype
.arguments
[0]
892 variables
[1].declared_type
= coltype
.arguments
[1]
897 if not is_col
and not is_map
then
898 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
902 # anchor formal and virtual types
903 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
905 mtype
= mtype
.as_notnullable
906 self.coltype
= mtype
.as(MClassType)
908 # get methods is_ok, next, item
909 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
910 if ikdef
== null then
911 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
914 self.method_is_ok
= ikdef
916 var itemdef
= v
.get_method
(self, ittype
, "item", false)
917 if itemdef
== null then
918 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
921 self.method_item
= itemdef
923 var nextdef
= v
.get_method
(self, ittype
, "next", false)
924 if nextdef
== null then
925 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
928 self.method_next
= nextdef
931 var keydef
= v
.get_method
(self, ittype
, "key", false)
932 if keydef
== null then
933 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
936 self.method_key
= keydef
940 redef fun accept_typing
(v
)
942 var mtype
= v
.visit_expr
(n_expr
)
943 if mtype
== null then return
945 self.do_type_iterator
(v
, mtype
)
947 v
.visit_stmt
(n_block
)
952 redef class AAssertExpr
953 redef fun accept_typing
(v
)
955 v
.visit_expr_bool
(n_expr
)
963 redef fun accept_typing
(v
)
965 v
.visit_expr_bool
(n_expr
)
966 v
.visit_expr_bool
(n_expr2
)
967 self.mtype
= v
.type_bool
(self)
971 redef class AImpliesExpr
972 redef fun accept_typing
(v
)
974 v
.visit_expr_bool
(n_expr
)
975 v
.visit_expr_bool
(n_expr2
)
976 self.mtype
= v
.type_bool
(self)
981 redef fun accept_typing
(v
)
983 v
.visit_expr_bool
(n_expr
)
984 v
.visit_expr_bool
(n_expr2
)
985 self.mtype
= v
.type_bool
(self)
991 redef fun accept_typing
(v
)
993 v
.visit_expr_bool
(n_expr
)
994 self.mtype
= v
.type_bool
(self)
998 redef class AOrElseExpr
999 redef fun accept_typing
(v
)
1001 var t1
= v
.visit_expr
(n_expr
)
1002 var t2
= v
.visit_expr
(n_expr2
)
1004 if t1
== null or t2
== null then
1008 t1
= t1
.as_notnullable
1010 var t
= v
.merge_types
(self, [t1
, t2
])
1012 t
= v
.mmodule
.object_type
1013 if t2
isa MNullableType then
1016 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1022 redef class ATrueExpr
1023 redef fun accept_typing
(v
)
1025 self.mtype
= v
.type_bool
(self)
1029 redef class AFalseExpr
1030 redef fun accept_typing
(v
)
1032 self.mtype
= v
.type_bool
(self)
1036 redef class AIntExpr
1037 redef fun accept_typing
(v
)
1039 var mclass
= v
.get_mclass
(self, "Int")
1040 if mclass
== null then return # Forward error
1041 self.mtype
= mclass
.mclass_type
1045 redef class AFloatExpr
1046 redef fun accept_typing
(v
)
1048 var mclass
= v
.get_mclass
(self, "Float")
1049 if mclass
== null then return # Forward error
1050 self.mtype
= mclass
.mclass_type
1054 redef class ACharExpr
1055 redef fun accept_typing
(v
)
1057 var mclass
= v
.get_mclass
(self, "Char")
1058 if mclass
== null then return # Forward error
1059 self.mtype
= mclass
.mclass_type
1063 redef class AStringFormExpr
1064 redef fun accept_typing
(v
)
1066 var mclass
= v
.get_mclass
(self, "String")
1067 if mclass
== null then return # Forward error
1068 self.mtype
= mclass
.mclass_type
1072 redef class ASuperstringExpr
1073 redef fun accept_typing
(v
)
1075 var mclass
= v
.get_mclass
(self, "String")
1076 if mclass
== null then return # Forward error
1077 self.mtype
= mclass
.mclass_type
1078 for nexpr
in self.n_exprs
do
1079 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1084 redef class AArrayExpr
1085 var with_capacity_callsite
: nullable CallSite
1086 var push_callsite
: nullable CallSite
1088 redef fun accept_typing
(v
)
1090 var mtypes
= new Array[nullable MType]
1091 for e
in self.n_exprs
.n_exprs
do
1092 var t
= v
.visit_expr
(e
)
1098 var mtype
= v
.merge_types
(self, mtypes
)
1099 if mtype
== null then
1100 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1103 var mclass
= v
.get_mclass
(self, "Array")
1104 if mclass
== null then return # Forward error
1105 var array_mtype
= mclass
.get_mtype
([mtype
])
1107 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1108 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1110 self.mtype
= array_mtype
1114 redef class ARangeExpr
1115 var init_callsite
: nullable CallSite
1117 redef fun accept_typing
(v
)
1119 var discrete_class
= v
.get_mclass
(self, "Discrete")
1120 if discrete_class
== null then return # Forward error
1121 var discrete_type
= discrete_class
.intro
.bound_mtype
1122 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1123 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1124 if t1
== null or t2
== null then return
1125 var mclass
= v
.get_mclass
(self, "Range")
1126 if mclass
== null then return # Forward error
1128 if v
.is_subtype
(t1
, t2
) then
1129 mtype
= mclass
.get_mtype
([t2
])
1130 else if v
.is_subtype
(t2
, t1
) then
1131 mtype
= mclass
.get_mtype
([t1
])
1133 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1139 # get the constructor
1141 if self isa ACrangeExpr then
1142 callsite
= v
.get_method
(self, mtype
, "init", false)
1143 else if self isa AOrangeExpr then
1144 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1148 init_callsite
= callsite
1152 redef class ANullExpr
1153 redef fun accept_typing
(v
)
1155 self.mtype
= v
.mmodule
.model
.null_type
1159 redef class AIsaExpr
1160 # The static type to cast to.
1161 # (different from the static type of the expression that is `Bool`).
1162 var cast_type
: nullable MType
1163 redef fun accept_typing
(v
)
1165 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1166 self.cast_type
= mtype
1168 var variable
= self.n_expr
.its_variable
1169 if variable
!= null then
1170 var orig
= self.n_expr
.mtype
1171 var from
= if orig
!= null then orig
.to_s
else "invalid"
1172 var to
= if mtype
!= null then mtype
.to_s
else "invalid"
1173 #debug("adapt {variable}: {from} -> {to}")
1174 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1177 self.mtype
= v
.type_bool
(self)
1181 redef class AAsCastExpr
1182 redef fun accept_typing
(v
)
1184 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1188 redef class AAsNotnullExpr
1189 redef fun accept_typing
(v
)
1191 var mtype
= v
.visit_expr
(self.n_expr
)
1192 if mtype
== null then return # Forward error
1194 if mtype
isa MNullType then
1195 v
.error
(self, "Type error: as(not null) on null")
1198 if mtype
isa MNullableType then
1199 self.mtype
= mtype
.mtype
1204 if mtype
isa MClassType then
1205 v
.modelbuilder
.warning
(self, "Warning: expression is already not null, since it is a `{mtype}`.")
1208 assert mtype
.need_anchor
1209 var u
= v
.anchor_to
(mtype
)
1210 if not u
isa MNullableType then
1211 v
.modelbuilder
.warning
(self, "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1217 redef class AProxyExpr
1218 redef fun accept_typing
(v
)
1220 self.mtype
= v
.visit_expr
(self.n_expr
)
1224 redef class ASelfExpr
1225 redef var its_variable
: nullable Variable
1226 redef fun accept_typing
(v
)
1228 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1229 v
.error
(self, "Error: self cannot be used in top-level method.")
1231 var variable
= v
.selfvariable
1232 self.its_variable
= variable
1233 self.mtype
= v
.get_variable
(self, variable
)
1237 ## MESSAGE SENDING AND PROPERTY
1239 redef class ASendExpr
1240 # The property invoked by the send.
1241 var callsite
: nullable CallSite
1243 redef fun accept_typing
(v
)
1245 var recvtype
= v
.visit_expr
(self.n_expr
)
1246 var name
= self.property_name
1248 if recvtype
== null then return # Forward error
1249 if recvtype
isa MNullType then
1250 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1254 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1255 if callsite
== null then return
1256 self.callsite
= callsite
1257 var msignature
= callsite
.msignature
1259 var args
= compute_raw_arguments
1261 callsite
.check_signature
(v
, args
)
1263 if callsite
.mproperty
.is_init
then
1264 var vmpropdef
= v
.mpropdef
1265 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1266 v
.error
(self, "Can call a init only in another init")
1268 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1269 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1273 var ret
= msignature
.return_mtype
1277 self.is_typed
= true
1281 # The name of the property
1282 # Each subclass simply provide the correct name.
1283 private fun property_name
: String is abstract
1285 # An array of all arguments (excluding self)
1286 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1288 private fun compute_raw_arguments
: Array[AExpr] is abstract
1291 redef class ABinopExpr
1292 redef fun compute_raw_arguments
do return [n_expr2
]
1295 redef fun property_name
do return "=="
1296 redef fun accept_typing
(v
)
1300 var variable
= self.n_expr
.its_variable
1301 if variable
== null then return
1302 var mtype
= self.n_expr2
.mtype
1303 if not mtype
isa MNullType then return
1304 var vartype
= v
.get_variable
(self, variable
)
1305 if not vartype
isa MNullableType then return
1306 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1307 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1308 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
1312 redef fun property_name
do return "!="
1313 redef fun accept_typing
(v
)
1317 var variable
= self.n_expr
.its_variable
1318 if variable
== null then return
1319 var mtype
= self.n_expr2
.mtype
1320 if not mtype
isa MNullType then return
1321 var vartype
= v
.get_variable
(self, variable
)
1322 if not vartype
isa MNullableType then return
1323 self.after_flow_context
.when_false
.set_var
(variable
, mtype
)
1324 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1325 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1329 redef fun property_name
do return "<"
1332 redef fun property_name
do return "<="
1335 redef fun property_name
do return "<<"
1338 redef fun property_name
do return ">"
1341 redef fun property_name
do return ">="
1344 redef fun property_name
do return ">>"
1346 redef class APlusExpr
1347 redef fun property_name
do return "+"
1349 redef class AMinusExpr
1350 redef fun property_name
do return "-"
1352 redef class AStarshipExpr
1353 redef fun property_name
do return "<=>"
1355 redef class AStarExpr
1356 redef fun property_name
do return "*"
1358 redef class ASlashExpr
1359 redef fun property_name
do return "/"
1361 redef class APercentExpr
1362 redef fun property_name
do return "%"
1365 redef class AUminusExpr
1366 redef fun property_name
do return "unary -"
1367 redef fun compute_raw_arguments
do return new Array[AExpr]
1371 redef class ACallExpr
1372 redef fun property_name
do return n_id
.text
1373 redef fun compute_raw_arguments
do return n_args
.to_a
1376 redef class ACallAssignExpr
1377 redef fun property_name
do return n_id
.text
+ "="
1378 redef fun compute_raw_arguments
1380 var res
= n_args
.to_a
1386 redef class ABraExpr
1387 redef fun property_name
do return "[]"
1388 redef fun compute_raw_arguments
do return n_args
.to_a
1391 redef class ABraAssignExpr
1392 redef fun property_name
do return "[]="
1393 redef fun compute_raw_arguments
1395 var res
= n_args
.to_a
1401 redef class ASendReassignFormExpr
1402 # The property invoked for the writing
1403 var write_callsite
: nullable CallSite
1405 redef fun accept_typing
(v
)
1407 var recvtype
= v
.visit_expr
(self.n_expr
)
1408 var name
= self.property_name
1410 if recvtype
== null then return # Forward error
1411 if recvtype
isa MNullType then
1412 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1416 var for_self
= self.n_expr
isa ASelfExpr
1417 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1419 if callsite
== null then return
1420 self.callsite
= callsite
1422 var args
= compute_raw_arguments
1424 callsite
.check_signature
(v
, args
)
1426 var readtype
= callsite
.msignature
.return_mtype
1427 if readtype
== null then
1428 v
.error
(self, "Error: {name} is not a function")
1432 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1433 if wcallsite
== null then return
1434 self.write_callsite
= wcallsite
1436 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1437 if wtype
== null then return
1439 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1440 args
.add
(self.n_value
)
1441 wcallsite
.check_signature
(v
, args
)
1443 self.is_typed
= true
1447 redef class ACallReassignExpr
1448 redef fun property_name
do return n_id
.text
1449 redef fun compute_raw_arguments
do return n_args
.to_a
1452 redef class ABraReassignExpr
1453 redef fun property_name
do return "[]"
1454 redef fun compute_raw_arguments
do return n_args
.to_a
1457 redef class AInitExpr
1458 redef fun property_name
do return "init"
1459 redef fun compute_raw_arguments
do return n_args
.to_a
1463 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1468 redef class ASuperExpr
1469 # The method to call if the super is in fact a 'super init call'
1470 # Note: if the super is a normal call-next-method, then this attribute is null
1471 var callsite
: nullable CallSite
1473 # The method to call is the super is a standard `call-next-method` super-call
1474 # Note: if the super is a special super-init-call, then this attribute is null
1475 var mpropdef
: nullable MMethodDef
1477 redef fun accept_typing
(v
)
1479 var recvtype
= v
.anchor
1480 assert recvtype
!= null
1481 var mproperty
= v
.mpropdef
.mproperty
1482 if not mproperty
isa MMethod then
1483 v
.error
(self, "Error: super only usable in a method")
1486 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, recvtype
)
1487 if superprops
.length
== 0 then
1488 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1489 process_superinit
(v
)
1492 v
.error
(self, "Error: No super method to call for {mproperty}.")
1495 # FIXME: covariance of return type in linear extension?
1496 var superprop
= superprops
.first
1498 var msignature
= superprop
.msignature
.as(not null)
1499 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1500 var args
= self.n_args
.to_a
1501 if args
.length
> 0 then
1502 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1504 self.mtype
= msignature
.return_mtype
1505 self.is_typed
= true
1506 v
.mpropdef
.has_supercall
= true
1507 mpropdef
= v
.mpropdef
.as(MMethodDef)
1510 private fun process_superinit
(v
: TypeVisitor)
1512 var recvtype
= v
.anchor
1513 assert recvtype
!= null
1514 var mpropdef
= v
.mpropdef
1515 assert mpropdef
isa MMethodDef
1516 var mproperty
= mpropdef
.mproperty
1517 var superprop
: nullable MMethodDef = null
1518 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1519 msupertype
= msupertype
.anchor_to
(v
.mmodule
, recvtype
)
1520 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1521 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1522 if candidate
== null then
1523 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forard error
1524 continue # Try next super-class
1526 if superprop
!= null and candidate
.is_root_init
then
1529 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1530 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1533 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, recvtype
)
1534 if superprop
!= null and superprop
.mproperty
== candidate
then
1535 if superprop
== candidatedefs
.first
then continue
1536 candidatedefs
.add
(superprop
)
1538 if candidatedefs
.length
> 1 then
1539 v
.error
(self, "Error: confliting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1542 superprop
= candidatedefs
.first
1544 if superprop
== null then
1545 v
.error
(self, "Error: No super method to call for {mproperty}.")
1549 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1550 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1552 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1553 self.callsite
= callsite
1555 var args
= self.n_args
.to_a
1556 if args
.length
> 0 then
1557 callsite
.check_signature
(v
, args
)
1559 # Check there is at least enough parameters
1560 if mpropdef
.msignature
.arity
< msignature
.arity
then
1561 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1564 # Check that each needed parameter is conform
1566 for sp
in msignature
.mparameters
do
1567 var p
= mpropdef
.msignature
.mparameters
[i
]
1568 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1569 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1576 self.is_typed
= true
1582 redef class ANewExpr
1583 # The constructor invoked by the new.
1584 var callsite
: nullable CallSite
1586 redef fun accept_typing
(v
)
1588 var recvtype
= v
.resolve_mtype
(self.n_type
)
1589 if recvtype
== null then return
1590 self.mtype
= recvtype
1592 if not recvtype
isa MClassType then
1593 if recvtype
isa MNullableType then
1594 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1597 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1601 if recvtype
.mclass
.kind
== abstract_kind
then
1602 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1604 else if recvtype
.mclass
.kind
== interface_kind
then
1605 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1617 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1618 if callsite
== null then return
1620 self.callsite
= callsite
1622 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1623 v
.error
(self, "Error: {name} is not a constructor.")
1627 var args
= n_args
.to_a
1628 callsite
.check_signature
(v
, args
)
1634 redef class AAttrFormExpr
1635 # The attribute acceded.
1636 var mproperty
: nullable MAttribute
1638 # The static type of the attribute.
1639 var attr_type
: nullable MType
1641 # Resolve the attribute acceded.
1642 private fun resolve_property
(v
: TypeVisitor)
1644 var recvtype
= v
.visit_expr
(self.n_expr
)
1645 if recvtype
== null then return # Skip error
1646 var name
= self.n_id
.text
1647 if recvtype
isa MNullType then
1648 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1652 var unsafe_type
= v
.anchor_to
(recvtype
)
1653 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1654 if mproperty
== null then
1655 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1658 assert mproperty
isa MAttribute
1659 self.mproperty
= mproperty
1661 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1662 assert mpropdefs
.length
== 1
1663 var mpropdef
= mpropdefs
.first
1664 var attr_type
= mpropdef
.static_mtype
.as(not null)
1665 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1666 self.attr_type
= attr_type
1670 redef class AAttrExpr
1671 redef fun accept_typing
(v
)
1673 self.resolve_property
(v
)
1674 self.mtype
= self.attr_type
1679 redef class AAttrAssignExpr
1680 redef fun accept_typing
(v
)
1682 self.resolve_property
(v
)
1683 var mtype
= self.attr_type
1685 v
.visit_expr_subtype
(self.n_value
, mtype
)
1686 self.is_typed
= true
1690 redef class AAttrReassignExpr
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 self.resolve_reassignment
(v
, mtype
, mtype
)
1699 self.is_typed
= true
1703 redef class AIssetAttrExpr
1704 redef fun accept_typing
(v
)
1706 self.resolve_property
(v
)
1707 var mtype
= self.attr_type
1708 if mtype
== null then return # Skip error
1710 var recvtype
= self.n_expr
.mtype
.as(not null)
1711 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1712 if bound
isa MNullableType then
1713 v
.error
(self, "Error: isset on a nullable attribute.")
1715 self.mtype
= v
.type_bool
(self)
1721 redef class ADebugTypeExpr
1722 redef fun accept_typing
(v
)
1724 var expr
= v
.visit_expr
(self.n_expr
)
1725 if expr
== null then return
1726 var unsafe
= v
.anchor_to
(expr
)
1727 var ntype
= self.n_type
1728 var mtype
= v
.resolve_mtype
(ntype
)
1729 if mtype
!= null and mtype
!= expr
then
1730 var umtype
= v
.anchor_to
(mtype
)
1731 v
.modelbuilder
.warning
(self, "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1733 self.is_typed
= true