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
])
31 # Does the MPropDef contains a call to super or a call of a super-constructor?
32 var has_supercall
: Bool = false
35 private class TypingPhase
37 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
40 private class TypeVisitor
41 var modelbuilder
: ModelBuilder
42 var nclassdef
: AClassdef
43 var mpropdef
: MPropDef
45 var selfvariable
: Variable = new Variable("self")
47 init(modelbuilder
: ModelBuilder, nclassdef
: AClassdef, mpropdef
: MPropDef)
49 self.modelbuilder
= modelbuilder
50 self.nclassdef
= nclassdef
51 self.mpropdef
= mpropdef
53 var mclass
= nclassdef
.mclassdef
.mclass
55 var selfvariable
= new Variable("self")
56 self.selfvariable
= selfvariable
57 selfvariable
.declared_type
= mclass
.mclass_type
60 fun mmodule
: MModule do return self.nclassdef
.mclassdef
.mmodule
62 fun anchor
: MClassType do return self.nclassdef
.mclassdef
.bound_mtype
64 fun anchor_to
(mtype
: MType): MType
66 var mmodule
= self.nclassdef
.mclassdef
.mmodule
67 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
68 return mtype
.anchor_to
(mmodule
, anchor
)
71 fun is_subtype
(sub
, sup
: MType): Bool
73 var mmodule
= self.nclassdef
.mclassdef
.mmodule
74 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
75 return sub
.is_subtype
(mmodule
, anchor
, sup
)
78 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
80 var mmodule
= self.nclassdef
.mclassdef
.mmodule
81 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
82 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
83 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
87 # Retrieve the signature of a `MMethodDef` resolved for a specific call.
88 # This method is an helper to symplify the query on the model.
90 # Note: `for_self` indicates if the reciever is self or not.
91 # If yes, virtual types are not resolved.
92 fun resolve_signature_for
(mmethoddef
: MMethodDef, recv
: MType, for_self
: Bool): MSignature
94 return self.resolve_for
(mmethoddef
.msignature
.as(not null), recv
, for_self
).as(MSignature)
97 # Check that `sub` is a subtype of `sup`.
98 # If `sub` is not a valud suptype, then display an error on `node` an return null.
99 # If `sub` is a safe subtype of `sup` then return `sub`.
100 # If `sub` is an insafe subtype (ie an imlicit cast is required), then return `sup`.
102 # The point of the return type is to determinate the usable type on an expression:
103 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
104 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
105 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
107 if self.is_subtype
(sub
, sup
) then return sub
108 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
109 # FIXME workarround to the current unsafe typing policy. To remove once fixed virtual types exists.
110 #node.debug("Unsafe typing: expected {sup}, got {sub}")
113 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
117 # Visit an expression and do not care about the return value
118 fun visit_stmt
(nexpr
: nullable AExpr)
120 if nexpr
== null then return
121 nexpr
.accept_typing
(self)
124 # Visit an expression and expects that it is not a statement
125 # Return the type of the expression
126 # Display an error and return null if:
127 # * the type cannot be determined or
128 # * `nexpr` is a statement
129 fun visit_expr
(nexpr
: AExpr): nullable MType
131 nexpr
.accept_typing
(self)
132 var mtype
= nexpr
.mtype
133 if mtype
!= null then return mtype
134 if not nexpr
.is_typed
then
135 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
136 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
137 nexpr
.debug
("No return type but no error.")
140 return null # forward error
142 self.error
(nexpr
, "Type error: expected expression.")
146 # Visit an expression and expect its static type is a least a `sup`
147 # Return the type of the expression or null if
148 # * the type cannot be determined or
149 # * `nexpr` is a statement or
150 # * `nexpr` is not a `sup`
151 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
153 var sub
= visit_expr
(nexpr
)
154 if sub
== null then return null # Forward error
156 if sup
== null then return null # Forward error
158 var res
= check_subtype
(nexpr
, sub
, sup
)
160 nexpr
.implicit_cast_to
= res
165 # Visit an expression and expect its static type is a `Bool`
166 # Return the type of the expression or null if
167 # * the type cannot be determined or
168 # * `nexpr` is a statement or
169 # * `nexpr` is not a `Bool`
170 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
172 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
176 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
178 var sub
= visit_expr
(nexpr
)
179 if sub
== null then return null # Forward error
181 var sup
= self.resolve_mtype
(ntype
)
182 if sup
== null then return null # Forward error
184 var mmodule
= self.nclassdef
.mclassdef
.mmodule
185 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
187 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup}.")
188 else if self.is_subtype
(sub
, sup
) and not sup
.need_anchor
then
189 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup} since it is a {sub}.")
194 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
196 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, self.nclassdef
.mclassdef
.mmodule
, mtype
, name
)
199 fun resolve_mtype
(node
: AType): nullable MType
201 return self.modelbuilder
.resolve_mtype
(self.nclassdef
, node
)
204 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
206 var mmodule
= self.nclassdef
.mclassdef
.mmodule
207 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
211 fun get_mclass
(node
: ANode, name
: String): nullable MClass
213 var mmodule
= self.nclassdef
.mclassdef
.mmodule
214 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
215 if mclass
== null then
216 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
221 fun type_bool
(node
: ANode): nullable MType
223 var mclass
= self.get_mclass
(node
, "Bool")
224 if mclass
== null then return null
225 return mclass
.mclass_type
228 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
230 var unsafe_type
= self.anchor_to
(recvtype
)
232 #debug("recv: {recvtype} (aka {unsafe_type})")
233 if recvtype
isa MNullType then
234 self.error
(node
, "Error: Method '{name}' call on 'null'.")
238 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
239 if mproperty
== null then
240 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
242 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
244 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
249 assert mproperty
isa MMethod
250 if mproperty
.visibility
== protected_visibility
and not recv_is_self
and self.mmodule
.visibility_for
(mproperty
.intro_mclassdef
.mmodule
) < intrude_visibility
then
251 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self. {mproperty.intro_mclassdef.mmodule.visibility_for(self.mmodule)}")
255 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
257 if propdefs
.length
== 0 then
258 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
260 else if propdefs
.length
== 1 then
261 mpropdef
= propdefs
.first
263 self.modelbuilder
.warning
(node
, "Warning: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
264 mpropdef
= mproperty
.intro
268 var msignature
= self.resolve_signature_for
(mpropdef
, recvtype
, recv_is_self
)
270 var erasure_cast
= false
271 var rettype
= mpropdef
.msignature
.return_mtype
272 if not recv_is_self
and rettype
!= null then
273 if rettype
isa MNullableType then rettype
= rettype
.mtype
274 if rettype
isa MParameterType then
275 var erased_rettype
= msignature
.return_mtype
276 assert erased_rettype
!= null
277 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
282 var callsite
= new CallSite(node
, recvtype
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
286 # Visit the expressions of args and cheik their conformity with the corresponding typi in signature
287 # The point of this method is to handle varargs correctly
288 # Note: The signature must be correctly adapted
289 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
291 var vararg_rank
= msignature
.vararg_rank
292 if vararg_rank
>= 0 then
293 if args
.length
< msignature
.arity
then
294 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
295 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
298 else if args
.length
!= msignature
.arity
then
299 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
303 #debug("CALL {unsafe_type}.{msignature}")
305 var vararg_decl
= args
.length
- msignature
.arity
306 for i
in [0..msignature
.arity
[ do
308 if i
== vararg_rank
then continue # skip the vararg
309 if i
> vararg_rank
then
312 var paramtype
= msignature
.mparameters
[i
].mtype
313 self.visit_expr_subtype
(args
[j
], paramtype
)
315 if vararg_rank
>= 0 then
316 var varargs
= new Array[AExpr]
317 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
318 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
320 self.visit_expr_subtype
(args
[j
], paramtype
)
326 fun error
(node
: ANode, message
: String)
328 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
331 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
333 var flow
= node
.after_flow_context
335 self.error
(node
, "No context!")
339 if flow
.vars
.has_key
(variable
) then
340 return flow
.vars
[variable
]
342 #node.debug("*** START Collected for {variable}")
343 var mtypes
= flow
.collect_types
(variable
)
344 #node.debug("**** END Collected for {variable}")
345 if mtypes
== null or mtypes
.length
== 0 then
346 return variable
.declared_type
347 else if mtypes
.length
== 1 then
350 var res
= merge_types
(node
,mtypes
)
351 if res
== null then res
= variable
.declared_type
357 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
359 var flow
= node
.after_flow_context
362 flow
.set_var
(variable
, mtype
)
365 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
367 if col
.length
== 1 then return col
.first
368 var res
= new Array[nullable MType]
370 if t1
== null then continue # return null
373 if t2
== null then continue # return null
374 if t2
isa MNullableType or t2
isa MNullType then
377 if not is_subtype
(t2
, t1
) then found
= false
380 #print "merge {col.join(" ")} -> {t1}"
384 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
389 # A specific method call site with its associated informations.
391 # The assiciated node for location
394 # The statis type of the receiver
397 # Is the receiver self?
398 # If "for_self", virtual types of the signature are keeped
399 # If "not_for_self", virtual type are erased
400 var recv_is_self
: Bool
402 # The designated method
403 var mproperty
: MMethod
405 # The statically designated method definition
406 # The most specif one, it is.
407 var mpropdef
: MMethodDef
409 # The resolved signature for the receiver
410 var msignature
: MSignature
412 # Is a implicit cast required on erasure typing policy?
413 var erasure_cast
: Bool
415 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
417 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
422 # The declared type of the variable
423 var declared_type
: nullable MType
426 redef class FlowContext
427 # Store changes of types because of type evolution
428 private var vars
: HashMap[Variable, nullable MType] = new HashMap[Variable, nullable MType]
429 private var cache
: HashMap[Variable, nullable Array[nullable MType]] = new HashMap[Variable, nullable Array[nullable MType]]
431 # Adapt the variable to a static type
432 # Warning1: do not modify vars directly.
433 # Warning2: sub-flow may have cached a unadapted variabial
434 private fun set_var
(variable
: Variable, mtype
: nullable MType)
436 self.vars
[variable
] = mtype
437 self.cache
.keys
.remove
(variable
)
440 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
442 if cache
.has_key
(variable
) then
443 return cache
[variable
]
445 var res
: nullable Array[nullable MType] = null
446 if vars
.has_key
(variable
) then
447 var mtype
= vars
[variable
]
449 else if self.previous
.is_empty
then
451 res
= [variable
.declared_type
]
453 for flow
in self.previous
do
454 if flow
.is_unreachable
then continue
455 var r2
= flow
.collect_types
(variable
)
456 if r2
== null then continue
461 if not res
.has
(t
) then res
.add
(t
)
466 cache
[variable
] = res
472 # The entry point of the whole typing analysis
473 fun do_typing
(modelbuilder
: ModelBuilder)
477 # The variable associated to the reciever (if any)
478 var selfvariable
: nullable Variable
481 redef class AConcreteMethPropdef
482 redef fun do_typing
(modelbuilder
: ModelBuilder)
484 var nclassdef
= self.parent
.as(AClassdef)
485 var mpropdef
= self.mpropdef
.as(not null)
486 var v
= new TypeVisitor(modelbuilder
, nclassdef
, mpropdef
)
487 self.selfvariable
= v
.selfvariable
489 var nblock
= self.n_block
490 if nblock
== null then return
492 var mmethoddef
= self.mpropdef
.as(not null)
493 for i
in [0..mmethoddef
.msignature
.arity
[ do
494 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
495 if mmethoddef
.msignature
.vararg_rank
== i
then
496 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
497 if arrayclass
== null then return # Skip error
498 mtype
= arrayclass
.get_mtype
([mtype
])
500 var variable
= self.n_signature
.n_params
[i
].variable
501 assert variable
!= null
502 variable
.declared_type
= mtype
504 for i
in [0..mmethoddef
.msignature
.mclosures
.length
[ do
505 var mclosure
= mmethoddef
.msignature
.mclosures
[i
]
506 var variable
= self.n_signature
.n_closure_decls
[i
].variable
507 assert variable
!= null
508 variable
.declared_type
= mclosure
.mtype
512 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
513 # We reach the end of the function without having a return, it is bad
514 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
519 redef class AAttrPropdef
520 redef fun do_typing
(modelbuilder
: ModelBuilder)
522 var nclassdef
= self.parent
.as(AClassdef)
523 var v
= new TypeVisitor(modelbuilder
, nclassdef
, self.mpropdef
.as(not null))
524 self.selfvariable
= v
.selfvariable
526 var nexpr
= self.n_expr
527 if nexpr
!= null then
528 var mtype
= self.mpropdef
.static_mtype
529 v
.visit_expr_subtype
(nexpr
, mtype
)
537 # The static type of the expression.
538 # null if self is a statement of in case of error
539 var mtype
: nullable MType = null
541 # Is the statement correctly typed?
542 # Used to distinguish errors and statements when `mtype == null`
543 var is_typed
: Bool = false
545 # If required, the following implicit cast `.as(XXX)`
546 # Such a cast may by required after evaluating the expression when
547 # a unsafe operation is detected (silently accepted by the Nit language).
548 # The attribute is computed by `check_subtype`
549 var implicit_cast_to
: nullable MType = null
551 # Return the variable read (if any)
552 # Used to perform adaptive typing
553 fun its_variable
: nullable Variable do return null
555 private fun accept_typing
(v
: TypeVisitor)
557 v
.error
(self, "no implemented accept_typing for {self.class_name}")
561 redef class ABlockExpr
562 redef fun accept_typing
(v
)
564 for e
in self.n_expr
do v
.visit_stmt
(e
)
568 # The type of a blockexpr is the one of the last expression (or null if empty)
571 if self.n_expr
.is_empty
then return null
572 return self.n_expr
.last
.mtype
576 redef class AVardeclExpr
577 redef fun accept_typing
(v
)
579 var variable
= self.variable
580 if variable
== null then return # Skip error
582 var ntype
= self.n_type
583 var mtype
: nullable MType
584 if ntype
== null then
587 mtype
= v
.resolve_mtype
(ntype
)
588 if mtype
== null then return # Skip error
591 var nexpr
= self.n_expr
592 if nexpr
!= null then
593 if mtype
!= null then
594 v
.visit_expr_subtype
(nexpr
, mtype
)
596 mtype
= v
.visit_expr
(nexpr
)
597 if mtype
== null then return # Skip error
602 if mtype
== null or mtype
isa MNullType then
603 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
604 if mtype
== null then mtype
= decltype
607 variable
.declared_type
= decltype
608 v
.set_variable
(self, variable
, mtype
)
610 #debug("var {variable}: {mtype}")
617 redef fun its_variable
do return self.variable
618 redef fun accept_typing
(v
)
620 var variable
= self.variable
621 if variable
== null then return # Skip error
623 var mtype
= v
.get_variable
(self, variable
)
624 if mtype
!= null then
625 #debug("{variable} is {mtype}")
627 #debug("{variable} is untyped")
634 redef class AVarAssignExpr
635 redef fun accept_typing
(v
)
637 var variable
= self.variable
638 assert variable
!= null
640 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
642 v
.set_variable
(self, variable
, mtype
)
648 redef class AReassignFormExpr
649 # @depreciated use `reassign_callsite`
650 fun reassign_property
: nullable MMethodDef do return self.reassign_callsite
.mpropdef
652 # The method designed by the reassign operator.
653 var reassign_callsite
: nullable CallSite
655 var read_type
: nullable MType = null
657 # Determine the `reassign_property`
658 # `readtype` is the type of the reading of the left value.
659 # `writetype` is the type of the writing of the left value.
660 # (Because of `ACallReassignExpr`, both can be different.
661 # Return the static type of the value to store.
662 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
664 var reassign_name
: String
665 if self.n_assign_op
isa APlusAssignOp then
667 else if self.n_assign_op
isa AMinusAssignOp then
673 self.read_type
= readtype
675 if readtype
isa MNullType then
676 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
680 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
681 if callsite
== null then return null # Skip error
682 self.reassign_callsite
= callsite
684 var msignature
= callsite
.msignature
685 var rettype
= msignature
.return_mtype
686 assert msignature
.arity
== 1 and rettype
!= null
688 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
689 if value_type
== null then return null # Skip error
691 v
.check_subtype
(self, rettype
, writetype
)
696 redef class AVarReassignExpr
697 redef fun accept_typing
(v
)
699 var variable
= self.variable
700 assert variable
!= null
702 var readtype
= v
.get_variable
(self, variable
)
703 if readtype
== null then return
705 var writetype
= variable
.declared_type
706 if writetype
== null then return
708 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
710 v
.set_variable
(self, variable
, rettype
)
717 redef class AContinueExpr
718 redef fun accept_typing
(v
)
720 var nexpr
= self.n_expr
721 if nexpr
!= null then
722 var mtype
= v
.visit_expr
(nexpr
)
728 redef class ABreakExpr
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 AReturnExpr
740 redef fun accept_typing
(v
)
742 var nexpr
= self.n_expr
743 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
744 if nexpr
!= null then
745 if ret_type
!= null then
746 var mtype
= v
.visit_expr_subtype
(nexpr
, ret_type
)
748 var mtype
= v
.visit_expr
(nexpr
)
749 v
.error
(self, "Error: Return with value in a procedure.")
751 else if ret_type
!= null then
752 v
.error
(self, "Error: Return without value in a function.")
758 redef class AAbortExpr
759 redef fun accept_typing
(v
)
766 redef fun accept_typing
(v
)
768 v
.visit_expr_bool
(n_expr
)
776 redef class AIfexprExpr
777 redef fun accept_typing
(v
)
779 v
.visit_expr_bool
(n_expr
)
781 var t1
= v
.visit_expr
(n_then
)
782 var t2
= v
.visit_expr
(n_else
)
784 if t1
== null or t2
== null then
788 var t
= v
.merge_types
(self, [t1
, t2
])
790 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
797 redef fun accept_typing
(v
)
799 v
.visit_stmt
(n_block
)
804 redef class AWhileExpr
805 redef fun accept_typing
(v
)
807 v
.visit_expr_bool
(n_expr
)
809 v
.visit_stmt
(n_block
)
814 redef class ALoopExpr
815 redef fun accept_typing
(v
)
817 v
.visit_stmt
(n_block
)
823 var coltype
: nullable MClassType
825 var method_iterator
: nullable MMethod
826 var method_is_ok
: nullable MMethod
827 var method_item
: nullable MMethod
828 var method_next
: nullable MMethod
829 var method_key
: nullable MMethod
831 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
833 if mtype
isa MNullType then
834 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
839 var objcla
= v
.get_mclass
(self, "Object")
840 if objcla
== null then return
842 # check iterator method
843 var unsafe_type
= v
.anchor_to
(mtype
)
844 if v
.try_get_mproperty_by_name2
(self, unsafe_type
, "iterator") == null then
845 if v
.try_get_mproperty_by_name2
(self, unsafe_type
, "iterate") == null then
846 v
.error
(self, "Type Error: Expected method 'iterator' in type {mtype}")
848 v
.modelbuilder
.error
(self, "NOT YET IMPLEMENTED: Do 'for' on {mtype}")
853 var itdef
= v
.get_method
(self, mtype
, "iterator", true)
854 if itdef
== null then
855 v
.error
(self, "Type Error: Expected method 'iterator' in type {mtype}")
858 self.method_iterator
= itdef
.mproperty
860 # check that iterator return something
861 var ittype
= itdef
.msignature
.return_mtype
862 if ittype
== null then
863 v
.error
(self, "Type Error: Expected method 'iterator' to return an Iterator or MapIterator type")
868 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
869 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
873 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
875 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
876 var variables
= self.variables
877 if variables
.length
!= 1 then
878 v
.error
(self, "Type Error: Expected one variable")
880 variables
.first
.declared_type
= coltype
.arguments
.first
885 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
887 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
888 var variables
= self.variables
889 if variables
.length
!= 2 then
890 v
.error
(self, "Type Error: Expected two variables")
892 variables
[0].declared_type
= coltype
.arguments
[0]
893 variables
[1].declared_type
= coltype
.arguments
[1]
898 if not is_col
and not is_map
then
899 v
.error
(self, "Type Error: Expected method 'iterator' to return an Iterator of MapIterator type")
903 # anchor formal and virtual types
904 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
906 if mtype
isa MNullableType then mtype
= mtype
.mtype
907 self.coltype
= mtype
.as(MClassType)
909 # get methods is_ok, next, item
910 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
911 if ikdef
== null then
912 v
.error
(self, "Type Error: Expected method 'is_ok' in Iterator type {ittype}")
915 self.method_is_ok
= ikdef
.mproperty
917 var itemdef
= v
.get_method
(self, ittype
, "item", false)
918 if itemdef
== null then
919 v
.error
(self, "Type Error: Expected method 'item' in Iterator type {ittype}")
922 self.method_item
= itemdef
.mproperty
924 var nextdef
= v
.get_method
(self, ittype
, "next", false)
925 if nextdef
== null then
926 v
.error
(self, "Type Error: Expected method 'next' in Iterator type {ittype}")
929 self.method_next
= nextdef
.mproperty
932 var keydef
= v
.get_method
(self, ittype
, "key", false)
933 if keydef
== null then
934 v
.error
(self, "Type Error: Expected method 'key' in Iterator type {ittype}")
937 self.method_key
= keydef
.mproperty
941 redef fun accept_typing
(v
)
943 var mtype
= v
.visit_expr
(n_expr
)
944 if mtype
== null then return
946 self.do_type_iterator
(v
, mtype
)
948 v
.visit_stmt
(n_block
)
953 redef class AAssertExpr
954 redef fun accept_typing
(v
)
956 v
.visit_expr_bool
(n_expr
)
964 redef fun accept_typing
(v
)
966 v
.visit_expr_bool
(n_expr
)
967 v
.visit_expr_bool
(n_expr2
)
968 self.mtype
= v
.type_bool
(self)
972 redef class AImpliesExpr
973 redef fun accept_typing
(v
)
975 v
.visit_expr_bool
(n_expr
)
976 v
.visit_expr_bool
(n_expr2
)
977 self.mtype
= v
.type_bool
(self)
982 redef fun accept_typing
(v
)
984 v
.visit_expr_bool
(n_expr
)
985 v
.visit_expr_bool
(n_expr2
)
986 self.mtype
= v
.type_bool
(self)
992 redef fun accept_typing
(v
)
994 v
.visit_expr_bool
(n_expr
)
995 self.mtype
= v
.type_bool
(self)
999 redef class AOrElseExpr
1000 redef fun accept_typing
(v
)
1002 var t1
= v
.visit_expr
(n_expr
)
1003 var t2
= v
.visit_expr
(n_expr2
)
1005 if t1
== null or t2
== null then
1009 if t1
isa MNullableType then
1013 var t
= v
.merge_types
(self, [t1
, t2
])
1015 t
= v
.mmodule
.object_type
1016 if t2
isa MNullableType then
1019 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1026 redef fun accept_typing
(v
)
1028 v
.visit_expr
(n_expr
)
1029 v
.visit_expr
(n_expr2
)
1030 self.mtype
= v
.type_bool
(self)
1034 redef class ATrueExpr
1035 redef fun accept_typing
(v
)
1037 self.mtype
= v
.type_bool
(self)
1041 redef class AFalseExpr
1042 redef fun accept_typing
(v
)
1044 self.mtype
= v
.type_bool
(self)
1048 redef class AIntExpr
1049 redef fun accept_typing
(v
)
1051 var mclass
= v
.get_mclass
(self, "Int")
1052 if mclass
== null then return # Forward error
1053 self.mtype
= mclass
.mclass_type
1057 redef class AFloatExpr
1058 redef fun accept_typing
(v
)
1060 var mclass
= v
.get_mclass
(self, "Float")
1061 if mclass
== null then return # Forward error
1062 self.mtype
= mclass
.mclass_type
1066 redef class ACharExpr
1067 redef fun accept_typing
(v
)
1069 var mclass
= v
.get_mclass
(self, "Char")
1070 if mclass
== null then return # Forward error
1071 self.mtype
= mclass
.mclass_type
1075 redef class AStringFormExpr
1076 redef fun accept_typing
(v
)
1078 var mclass
= v
.get_mclass
(self, "String")
1079 if mclass
== null then return # Forward error
1080 self.mtype
= mclass
.mclass_type
1084 redef class ASuperstringExpr
1085 redef fun accept_typing
(v
)
1087 var mclass
= v
.get_mclass
(self, "String")
1088 if mclass
== null then return # Forward error
1089 self.mtype
= mclass
.mclass_type
1090 for nexpr
in self.n_exprs
do
1091 var t
= v
.visit_expr
(nexpr
)
1096 redef class AArrayExpr
1097 redef fun accept_typing
(v
)
1099 var mtypes
= new Array[nullable MType]
1100 for e
in self.n_exprs
.n_exprs
do
1101 var t
= v
.visit_expr
(e
)
1107 var mtype
= v
.merge_types
(self, mtypes
)
1108 if mtype
== null then
1109 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1112 var mclass
= v
.get_mclass
(self, "Array")
1113 if mclass
== null then return # Forward error
1114 self.mtype
= mclass
.get_mtype
([mtype
])
1118 redef class ARangeExpr
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
1129 if v
.is_subtype
(t1
, t2
) then
1130 self.mtype
= mclass
.get_mtype
([t2
])
1131 else if v
.is_subtype
(t2
, t1
) then
1132 self.mtype
= mclass
.get_mtype
([t1
])
1134 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1139 redef class ANullExpr
1140 redef fun accept_typing
(v
)
1142 self.mtype
= v
.mmodule
.model
.null_type
1146 redef class AIsaExpr
1147 # The static type to cast to.
1148 # (different from the static type of the expression that is `Bool`).
1149 var cast_type
: nullable MType
1150 redef fun accept_typing
(v
)
1152 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1153 self.cast_type
= mtype
1155 var variable
= self.n_expr
.its_variable
1156 if variable
!= null then
1157 var orig
= self.n_expr
.mtype
1158 var from
= if orig
!= null then orig
.to_s
else "invalid"
1159 var to
= if mtype
!= null then mtype
.to_s
else "invalid"
1160 #debug("adapt {variable}: {from} -> {to}")
1161 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1164 self.mtype
= v
.type_bool
(self)
1168 redef class AAsCastExpr
1169 redef fun accept_typing
(v
)
1171 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1175 redef class AAsNotnullExpr
1176 redef fun accept_typing
(v
)
1178 var mtype
= v
.visit_expr
(self.n_expr
)
1179 if mtype
isa MNullType then
1180 v
.error
(self, "Type error: as(not null) on null")
1183 if mtype
isa MNullableType then
1184 self.mtype
= mtype
.mtype
1187 # TODO: warn on useless as not null
1192 redef class AProxyExpr
1193 redef fun accept_typing
(v
)
1195 self.mtype
= v
.visit_expr
(self.n_expr
)
1199 redef class ASelfExpr
1200 redef var its_variable
: nullable Variable
1201 redef fun accept_typing
(v
)
1203 var variable
= v
.selfvariable
1204 self.its_variable
= variable
1205 self.mtype
= v
.get_variable
(self, variable
)
1209 ## MESSAGE SENDING AND PROPERTY
1211 redef class ASendExpr
1212 # @depreciated: use `callsite`
1213 fun mproperty
: nullable MMethod do return callsite
.mproperty
1215 # The property invoked by the send.
1216 var callsite
: nullable CallSite
1218 redef fun accept_typing
(v
)
1220 var recvtype
= v
.visit_expr
(self.n_expr
)
1221 var name
= self.property_name
1223 if recvtype
== null then return # Forward error
1224 if recvtype
isa MNullType then
1225 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1229 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1230 if callsite
== null then return
1231 self.callsite
= callsite
1232 var msignature
= callsite
.msignature
1234 var args
= compute_raw_arguments
1235 self.raw_arguments
= args
1237 callsite
.check_signature
(v
, args
)
1239 if callsite
.mproperty
.is_init
then
1240 var vmpropdef
= v
.mpropdef
1241 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1242 v
.error
(self, "Can call a init only in another init")
1246 var ret
= msignature
.return_mtype
1250 self.is_typed
= true
1253 if self.n_closure_defs
.length
== msignature
.mclosures
.length
then
1254 for i
in [0..self.n_closure_defs
.length
[ do
1255 self.n_closure_defs
[i
].accept_typing
(v
, msignature
.mclosures
[i
])
1258 debug
("closure: got {self.n_closure_defs.length}, want {msignature.mclosures.length}")
1262 # The name of the property
1263 # Each subclass simply provide the correct name.
1264 private fun property_name
: String is abstract
1266 # An array of all arguments (excluding self)
1267 var raw_arguments
: nullable Array[AExpr]
1269 private fun compute_raw_arguments
: Array[AExpr] is abstract
1272 redef class ABinopExpr
1273 redef fun compute_raw_arguments
do return [n_expr2
]
1276 redef fun property_name
do return "=="
1277 redef fun accept_typing
(v
)
1281 var variable
= self.n_expr
.its_variable
1282 if variable
== null then return
1283 var mtype
= self.n_expr2
.mtype
1284 if not mtype
isa MNullType then return
1285 var vartype
= v
.get_variable
(self, variable
)
1286 if not vartype
isa MNullableType then return
1287 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1288 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1289 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
1293 redef fun property_name
do return "!="
1294 redef fun accept_typing
(v
)
1298 var variable
= self.n_expr
.its_variable
1299 if variable
== null then return
1300 var mtype
= self.n_expr2
.mtype
1301 if not mtype
isa MNullType then return
1302 var vartype
= v
.get_variable
(self, variable
)
1303 if not vartype
isa MNullableType then return
1304 self.after_flow_context
.when_false
.set_var
(variable
, mtype
)
1305 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1306 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1310 redef fun property_name
do return "<"
1313 redef fun property_name
do return "<="
1316 redef fun property_name
do return "<<"
1319 redef fun property_name
do return ">"
1322 redef fun property_name
do return ">="
1325 redef fun property_name
do return ">>"
1327 redef class APlusExpr
1328 redef fun property_name
do return "+"
1330 redef class AMinusExpr
1331 redef fun property_name
do return "-"
1333 redef class AStarshipExpr
1334 redef fun property_name
do return "<=>"
1336 redef class AStarExpr
1337 redef fun property_name
do return "*"
1339 redef class ASlashExpr
1340 redef fun property_name
do return "/"
1342 redef class APercentExpr
1343 redef fun property_name
do return "%"
1346 redef class AUminusExpr
1347 redef fun property_name
do return "unary -"
1348 redef fun compute_raw_arguments
do return new Array[AExpr]
1352 redef class ACallExpr
1353 redef fun property_name
do return n_id
.text
1354 redef fun compute_raw_arguments
do return n_args
.to_a
1357 redef class ACallAssignExpr
1358 redef fun property_name
do return n_id
.text
+ "="
1359 redef fun compute_raw_arguments
1361 var res
= n_args
.to_a
1367 redef class ABraExpr
1368 redef fun property_name
do return "[]"
1369 redef fun compute_raw_arguments
do return n_args
.to_a
1372 redef class ABraAssignExpr
1373 redef fun property_name
do return "[]="
1374 redef fun compute_raw_arguments
1376 var res
= n_args
.to_a
1382 redef class ASendReassignFormExpr
1383 # @depreciated use `write_callsite`
1384 fun write_mproperty
: nullable MMethod do return write_callsite
.mproperty
1386 # The property invoked for the writing
1387 var write_callsite
: nullable CallSite
1389 redef fun accept_typing
(v
)
1391 var recvtype
= v
.visit_expr
(self.n_expr
)
1392 var name
= self.property_name
1394 if recvtype
== null then return # Forward error
1395 if recvtype
isa MNullType then
1396 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1400 var for_self
= self.n_expr
isa ASelfExpr
1401 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1403 if callsite
== null then return
1404 self.callsite
= callsite
1406 var args
= compute_raw_arguments
1407 self.raw_arguments
= args
1409 callsite
.check_signature
(v
, args
)
1411 var readtype
= callsite
.msignature
.return_mtype
1412 if readtype
== null then
1413 v
.error
(self, "Error: {name} is not a function")
1417 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1418 if wcallsite
== null then return
1419 self.write_callsite
= wcallsite
1421 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1422 if wtype
== null then return
1424 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1425 args
.add
(self.n_value
)
1426 wcallsite
.check_signature
(v
, args
)
1428 self.is_typed
= true
1432 redef class ACallReassignExpr
1433 redef fun property_name
do return n_id
.text
1434 redef fun compute_raw_arguments
do return n_args
.to_a
1437 redef class ABraReassignExpr
1438 redef fun property_name
do return "[]"
1439 redef fun compute_raw_arguments
do return n_args
.to_a
1442 redef class AInitExpr
1443 redef fun property_name
do return "init"
1444 redef fun compute_raw_arguments
do return n_args
.to_a
1448 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1453 redef class ASuperExpr
1454 # The method to call if the super is in fact a 'super init call'
1455 # Note: if the super is a normal call-next-method, then this attribute is null
1456 var mproperty
: nullable MMethod
1458 redef fun accept_typing
(v
)
1460 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1461 var mproperty
= v
.mpropdef
.mproperty
1462 if not mproperty
isa MMethod then
1463 v
.error
(self, "Error: super only usable in a method")
1466 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, recvtype
)
1467 if superprops
.length
== 0 then
1468 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1469 process_superinit
(v
)
1472 v
.error
(self, "Error: No super method to call for {mproperty}.")
1475 # FIXME: covariance of return type in linear extension?
1476 var superprop
= superprops
.first
1477 assert superprop
isa MMethodDef
1479 var msignature
= v
.resolve_signature_for
(superprop
, recvtype
, true)
1480 var args
= self.n_args
.to_a
1481 if args
.length
> 0 then
1482 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1484 self.mtype
= msignature
.return_mtype
1485 self.is_typed
= true
1486 v
.mpropdef
.has_supercall
= true
1489 private fun process_superinit
(v
: TypeVisitor)
1491 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1492 var mproperty
= v
.mpropdef
.mproperty
1493 var superprop
: nullable MMethodDef = null
1494 for msupertype
in v
.nclassdef
.mclassdef
.supertypes
do
1495 msupertype
= msupertype
.anchor_to
(v
.mmodule
, recvtype
)
1496 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1497 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1498 if candidate
== null then
1499 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forard error
1500 continue # Try next super-class
1502 if superprop
!= null and superprop
.mproperty
!= candidate
then
1503 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1506 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, recvtype
)
1507 if superprop
!= null then
1508 if superprop
== candidatedefs
.first
then continue
1509 candidatedefs
.add
(superprop
)
1511 if candidatedefs
.length
> 1 then
1512 v
.error
(self, "Error: confliting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1515 superprop
= candidatedefs
.first
1517 if superprop
== null then
1518 v
.error
(self, "Error: No super method to call for {mproperty}.")
1521 self.mproperty
= superprop
.mproperty
1523 var args
= self.n_args
.to_a
1524 var msignature
= v
.resolve_signature_for
(superprop
, recvtype
, true)
1525 if args
.length
> 0 then
1526 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1528 # TODO: Check signature
1531 self.is_typed
= true
1537 redef class ANewExpr
1538 # @depreciated use `callsite`
1539 fun mproperty
: nullable MMethod do return self.callsite
.mproperty
1541 # The constructor invoked by the new.
1542 var callsite
: nullable CallSite
1544 redef fun accept_typing
(v
)
1546 var recvtype
= v
.resolve_mtype
(self.n_type
)
1547 if recvtype
== null then return
1548 self.mtype
= recvtype
1550 if not recvtype
isa MClassType then
1551 if recvtype
isa MNullableType then
1552 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1555 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1567 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1568 if callsite
== null then return
1570 self.callsite
= callsite
1572 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1573 v
.error
(self, "Error: {name} is not a constructor.")
1577 var args
= n_args
.to_a
1578 callsite
.check_signature
(v
, args
)
1584 redef class AAttrFormExpr
1585 # The attribute acceded.
1586 var mproperty
: nullable MAttribute
1588 # The static type of the attribute.
1589 var attr_type
: nullable MType
1591 # Resolve the attribute acceded.
1592 private fun resolve_property
(v
: TypeVisitor)
1594 var recvtype
= v
.visit_expr
(self.n_expr
)
1595 if recvtype
== null then return # Skip error
1596 var name
= self.n_id
.text
1597 if recvtype
isa MNullType then
1598 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1602 var unsafe_type
= v
.anchor_to
(recvtype
)
1603 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1604 if mproperty
== null then
1605 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1608 assert mproperty
isa MAttribute
1609 self.mproperty
= mproperty
1611 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1612 assert mpropdefs
.length
== 1
1613 var mpropdef
= mpropdefs
.first
1614 var attr_type
= mpropdef
.static_mtype
.as(not null)
1615 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1616 self.attr_type
= attr_type
1620 redef class AAttrExpr
1621 redef fun accept_typing
(v
)
1623 self.resolve_property
(v
)
1624 self.mtype
= self.attr_type
1629 redef class AAttrAssignExpr
1630 redef fun accept_typing
(v
)
1632 self.resolve_property
(v
)
1633 var mtype
= self.attr_type
1635 v
.visit_expr_subtype
(self.n_value
, mtype
)
1636 self.is_typed
= true
1640 redef class AAttrReassignExpr
1641 redef fun accept_typing
(v
)
1643 self.resolve_property
(v
)
1644 var mtype
= self.attr_type
1645 if mtype
== null then return # Skip error
1647 self.resolve_reassignment
(v
, mtype
, mtype
)
1649 self.is_typed
= true
1653 redef class AIssetAttrExpr
1654 redef fun accept_typing
(v
)
1656 self.resolve_property
(v
)
1657 var mtype
= self.attr_type
1658 if mtype
== null then return # Skip error
1660 var recvtype
= self.n_expr
.mtype
.as(not null)
1661 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1662 if bound
isa MNullableType then
1663 v
.error
(self, "Error: isset on a nullable attribute.")
1665 self.mtype
= v
.type_bool
(self)
1671 redef class AClosureCallExpr
1672 redef fun accept_typing
(v
)
1674 var variable
= self.variable
1675 if variable
== null then return # Skip error
1677 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1678 var msignature
= variable
.declared_type
.as(not null)
1679 msignature
= v
.resolve_for
(msignature
, recvtype
, false).as(MSignature)
1681 var args
= n_args
.to_a
1682 v
.check_signature
(self, args
, variable
.name
, msignature
)
1684 self.is_typed
= true
1685 self.mtype
= msignature
.return_mtype
1689 redef class AClosureDef
1690 var mclosure
: nullable MParameter
1692 private fun accept_typing
(v
: TypeVisitor, mparameter
: MParameter)
1694 var variables
= self.variables
1695 if variables
== null then return
1697 self.mclosure
= mparameter
1698 var msignature
= mparameter
.mtype
.as(MSignature)
1700 if msignature
.arity
!= variables
.length
then
1701 v
.error
(self, "Type error: closure {mparameter.name} expects {msignature.arity} parameters, {variables.length} given")
1705 for i
in [0..variables
.length
[ do
1706 variables
[i
].declared_type
= msignature
.mparameters
[i
].mtype
1709 v
.visit_stmt
(self.n_expr
)
1715 redef class ADebugTypeExpr
1716 redef fun accept_typing
(v
)
1718 var expr
= v
.visit_expr
(self.n_expr
)
1719 if expr
== null then return
1720 var unsafe
= v
.anchor_to
(expr
)
1721 var ntype
= self.n_type
1722 var mtype
= v
.resolve_mtype
(ntype
)
1723 if mtype
!= null and mtype
!= expr
then
1724 var umtype
= v
.anchor_to
(mtype
)
1725 v
.modelbuilder
.warning
(self, "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1727 self.is_typed
= true