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 valid 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 unsafe subtype (ie an implicit 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 workaround 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
, "useless-type-test", "Warning: Expression is already a {sup}.")
192 else if self.is_subtype
(sub
, sup
) then
193 self.modelbuilder
.warning
(node
, "useless-type-test", "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 info
= mproperty
.deprecation
266 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
269 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
271 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
275 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
277 if propdefs
.length
== 0 then
278 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
280 else if propdefs
.length
== 1 then
281 mpropdef
= propdefs
.first
283 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
284 mpropdef
= mproperty
.intro
288 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
289 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
291 var erasure_cast
= false
292 var rettype
= mpropdef
.msignature
.return_mtype
293 if not recv_is_self
and rettype
!= null then
294 rettype
= rettype
.as_notnullable
295 if rettype
isa MParameterType then
296 var erased_rettype
= msignature
.return_mtype
297 assert erased_rettype
!= null
298 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
303 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
307 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
309 var unsafe_type
= self.anchor_to
(recvtype
)
310 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
311 if mproperty
== null then return null
312 return get_method
(node
, recvtype
, name
, recv_is_self
)
316 # Visit the expressions of args and check their conformity with the corresponding type in signature
317 # The point of this method is to handle varargs correctly
318 # Note: The signature must be correctly adapted
319 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
321 var vararg_rank
= msignature
.vararg_rank
322 if vararg_rank
>= 0 then
323 if args
.length
< msignature
.arity
then
324 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
325 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
328 else if args
.length
!= msignature
.arity
then
329 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
333 #debug("CALL {unsafe_type}.{msignature}")
335 var vararg_decl
= args
.length
- msignature
.arity
336 for i
in [0..msignature
.arity
[ do
338 if i
== vararg_rank
then continue # skip the vararg
339 if i
> vararg_rank
then
342 var paramtype
= msignature
.mparameters
[i
].mtype
343 self.visit_expr_subtype
(args
[j
], paramtype
)
345 if vararg_rank
>= 0 then
346 var varargs
= new Array[AExpr]
347 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
348 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
350 self.visit_expr_subtype
(args
[j
], paramtype
)
356 fun error
(node
: ANode, message
: String)
358 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
361 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
363 var flow
= node
.after_flow_context
365 self.error
(node
, "No context!")
369 if flow
.vars
.has_key
(variable
) then
370 return flow
.vars
[variable
]
372 #node.debug("*** START Collected for {variable}")
373 var mtypes
= flow
.collect_types
(variable
)
374 #node.debug("**** END Collected for {variable}")
375 if mtypes
== null or mtypes
.length
== 0 then
376 return variable
.declared_type
377 else if mtypes
.length
== 1 then
380 var res
= merge_types
(node
,mtypes
)
381 if res
== null then res
= variable
.declared_type
387 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
389 var flow
= node
.after_flow_context
392 flow
.set_var
(variable
, mtype
)
395 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
397 if col
.length
== 1 then return col
.first
398 var res
= new Array[nullable MType]
400 if t1
== null then continue # return null
403 if t2
== null then continue # return null
404 if t2
isa MNullableType or t2
isa MNullType then
407 if not is_subtype
(t2
, t1
) then found
= false
410 #print "merge {col.join(" ")} -> {t1}"
414 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
419 # A specific method call site with its associated informations.
421 # The associated node for location
424 # The static type of the receiver (possibly unresolved)
427 # The module where the callsite is present
430 # The anchor to use with `recv` or `msignature`
431 var anchor
: nullable MClassType
433 # Is the receiver self?
434 # If "for_self", virtual types of the signature are kept
435 # If "not_for_self", virtual type are erased
436 var recv_is_self
: Bool
438 # The designated method
439 var mproperty
: MMethod
441 # The statically designated method definition
442 # The most specif one, it is.
443 var mpropdef
: MMethodDef
445 # The resolved signature for the receiver
446 var msignature
: MSignature
448 # Is a implicit cast required on erasure typing policy?
449 var erasure_cast
: Bool
451 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
453 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
458 # The declared type of the variable
459 var declared_type
: nullable MType
462 redef class FlowContext
463 # Store changes of types because of type evolution
464 private var vars
: HashMap[Variable, nullable MType] = new HashMap[Variable, nullable MType]
465 private var cache
: HashMap[Variable, nullable Array[nullable MType]] = new HashMap[Variable, nullable Array[nullable MType]]
467 # Adapt the variable to a static type
468 # Warning1: do not modify vars directly.
469 # Warning2: sub-flow may have cached a unadapted variable
470 private fun set_var
(variable
: Variable, mtype
: nullable MType)
472 self.vars
[variable
] = mtype
473 self.cache
.keys
.remove
(variable
)
476 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
478 if cache
.has_key
(variable
) then
479 return cache
[variable
]
481 var res
: nullable Array[nullable MType] = null
482 if vars
.has_key
(variable
) then
483 var mtype
= vars
[variable
]
485 else if self.previous
.is_empty
then
487 res
= [variable
.declared_type
]
489 for flow
in self.previous
do
490 if flow
.is_unreachable
then continue
491 var r2
= flow
.collect_types
(variable
)
492 if r2
== null then continue
497 if not res
.has
(t
) then res
.add
(t
)
502 cache
[variable
] = res
508 # The entry point of the whole typing analysis
509 fun do_typing
(modelbuilder
: ModelBuilder)
513 # The variable associated to the receiver (if any)
514 var selfvariable
: nullable Variable
517 redef class AMethPropdef
518 redef fun do_typing
(modelbuilder
: ModelBuilder)
520 var nblock
= self.n_block
521 if nblock
== null then return
523 var mpropdef
= self.mpropdef
.as(not null)
524 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
525 self.selfvariable
= v
.selfvariable
527 var mmethoddef
= self.mpropdef
.as(not null)
528 for i
in [0..mmethoddef
.msignature
.arity
[ do
529 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
530 if mmethoddef
.msignature
.vararg_rank
== i
then
531 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
532 if arrayclass
== null then return # Skip error
533 mtype
= arrayclass
.get_mtype
([mtype
])
535 var variable
= self.n_signature
.n_params
[i
].variable
536 assert variable
!= null
537 variable
.declared_type
= mtype
541 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
542 # We reach the end of the function without having a return, it is bad
543 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
548 redef class AAttrPropdef
549 redef fun do_typing
(modelbuilder
: ModelBuilder)
551 var mpropdef
= self.mpropdef
.as(not null)
552 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
553 self.selfvariable
= v
.selfvariable
555 var nexpr
= self.n_expr
556 if nexpr
!= null then
557 var mtype
= self.mpropdef
.static_mtype
558 v
.visit_expr_subtype
(nexpr
, mtype
)
566 # The static type of the expression.
567 # null if self is a statement or in case of error
568 var mtype
: nullable MType = null
570 # Is the statement correctly typed?
571 # Used to distinguish errors and statements when `mtype == null`
572 var is_typed
: Bool = false
574 # If required, the following implicit cast `.as(XXX)`
575 # Such a cast may by required after evaluating the expression when
576 # a unsafe operation is detected (silently accepted by the Nit language).
577 # The attribute is computed by `check_subtype`
578 var implicit_cast_to
: nullable MType = null
580 # Return the variable read (if any)
581 # Used to perform adaptive typing
582 fun its_variable
: nullable Variable do return null
584 private fun accept_typing
(v
: TypeVisitor)
586 v
.error
(self, "no implemented accept_typing for {self.class_name}")
590 redef class ABlockExpr
591 redef fun accept_typing
(v
)
593 for e
in self.n_expr
do v
.visit_stmt
(e
)
597 # The type of a blockexpr is the one of the last expression (or null if empty)
600 if self.n_expr
.is_empty
then return null
601 return self.n_expr
.last
.mtype
605 redef class AVardeclExpr
606 redef fun accept_typing
(v
)
608 var variable
= self.variable
609 if variable
== null then return # Skip error
611 var ntype
= self.n_type
612 var mtype
: nullable MType
613 if ntype
== null then
616 mtype
= v
.resolve_mtype
(ntype
)
617 if mtype
== null then return # Skip error
620 var nexpr
= self.n_expr
621 if nexpr
!= null then
622 if mtype
!= null then
623 v
.visit_expr_subtype
(nexpr
, mtype
)
625 mtype
= v
.visit_expr
(nexpr
)
626 if mtype
== null then return # Skip error
631 if mtype
== null or mtype
isa MNullType then
632 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
633 if mtype
== null then mtype
= decltype
636 variable
.declared_type
= decltype
637 v
.set_variable
(self, variable
, mtype
)
639 #debug("var {variable}: {mtype}")
646 redef fun its_variable
do return self.variable
647 redef fun accept_typing
(v
)
649 var variable
= self.variable
650 if variable
== null then return # Skip error
652 var mtype
= v
.get_variable
(self, variable
)
653 if mtype
!= null then
654 #debug("{variable} is {mtype}")
656 #debug("{variable} is untyped")
663 redef class AVarAssignExpr
664 redef fun accept_typing
(v
)
666 var variable
= self.variable
667 assert variable
!= null
669 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
671 v
.set_variable
(self, variable
, mtype
)
677 redef class AReassignFormExpr
678 # The method designed by the reassign operator.
679 var reassign_callsite
: nullable CallSite
681 var read_type
: nullable MType = null
683 # Determine the `reassign_property`
684 # `readtype` is the type of the reading of the left value.
685 # `writetype` is the type of the writing of the left value.
686 # (Because of `ACallReassignExpr`, both can be different.
687 # Return the static type of the value to store.
688 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
690 var reassign_name
: String
691 if self.n_assign_op
isa APlusAssignOp then
693 else if self.n_assign_op
isa AMinusAssignOp then
699 self.read_type
= readtype
701 if readtype
isa MNullType then
702 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
706 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
707 if callsite
== null then return null # Skip error
708 self.reassign_callsite
= callsite
710 var msignature
= callsite
.msignature
711 var rettype
= msignature
.return_mtype
712 assert msignature
.arity
== 1 and rettype
!= null
714 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
715 if value_type
== null then return null # Skip error
717 v
.check_subtype
(self, rettype
, writetype
)
722 redef class AVarReassignExpr
723 redef fun accept_typing
(v
)
725 var variable
= self.variable
726 assert variable
!= null
728 var readtype
= v
.get_variable
(self, variable
)
729 if readtype
== null then return
733 var writetype
= variable
.declared_type
734 if writetype
== null then return
736 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
738 v
.set_variable
(self, variable
, rettype
)
745 redef class AContinueExpr
746 redef fun accept_typing
(v
)
748 var nexpr
= self.n_expr
749 if nexpr
!= null then
750 var mtype
= v
.visit_expr
(nexpr
)
756 redef class ABreakExpr
757 redef fun accept_typing
(v
)
759 var nexpr
= self.n_expr
760 if nexpr
!= null then
761 var mtype
= v
.visit_expr
(nexpr
)
767 redef class AReturnExpr
768 redef fun accept_typing
(v
)
770 var nexpr
= self.n_expr
771 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
772 if nexpr
!= null then
773 if ret_type
!= null then
774 var mtype
= v
.visit_expr_subtype
(nexpr
, ret_type
)
776 var mtype
= v
.visit_expr
(nexpr
)
777 v
.error
(self, "Error: Return with value in a procedure.")
779 else if ret_type
!= null then
780 v
.error
(self, "Error: Return without value in a function.")
786 redef class AAbortExpr
787 redef fun accept_typing
(v
)
794 redef fun accept_typing
(v
)
796 v
.visit_expr_bool
(n_expr
)
804 redef class AIfexprExpr
805 redef fun accept_typing
(v
)
807 v
.visit_expr_bool
(n_expr
)
809 var t1
= v
.visit_expr
(n_then
)
810 var t2
= v
.visit_expr
(n_else
)
812 if t1
== null or t2
== null then
816 var t
= v
.merge_types
(self, [t1
, t2
])
818 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
825 redef fun accept_typing
(v
)
827 v
.visit_stmt
(n_block
)
832 redef class AWhileExpr
833 redef fun accept_typing
(v
)
835 v
.visit_expr_bool
(n_expr
)
837 v
.visit_stmt
(n_block
)
842 redef class ALoopExpr
843 redef fun accept_typing
(v
)
845 v
.visit_stmt
(n_block
)
851 var coltype
: nullable MClassType
853 var method_iterator
: nullable CallSite
854 var method_is_ok
: nullable CallSite
855 var method_item
: nullable CallSite
856 var method_next
: nullable CallSite
857 var method_key
: nullable CallSite
858 var method_finish
: nullable CallSite
860 var method_lt
: nullable CallSite
861 var method_successor
: nullable CallSite
863 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
865 if mtype
isa MNullType then
866 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
871 var objcla
= v
.get_mclass
(self, "Object")
872 if objcla
== null then return
874 # check iterator method
875 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
876 if itdef
== null then
877 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
880 self.method_iterator
= itdef
882 # check that iterator return something
883 var ittype
= itdef
.msignature
.return_mtype
884 if ittype
== null then
885 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
890 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
891 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
895 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
897 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
898 var variables
= self.variables
899 if variables
.length
!= 1 then
900 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
902 variables
.first
.declared_type
= coltype
.arguments
.first
907 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
909 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
910 var variables
= self.variables
911 if variables
.length
!= 2 then
912 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
914 variables
[0].declared_type
= coltype
.arguments
[0]
915 variables
[1].declared_type
= coltype
.arguments
[1]
920 if not is_col
and not is_map
then
921 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
925 # anchor formal and virtual types
926 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
928 mtype
= mtype
.as_notnullable
929 self.coltype
= mtype
.as(MClassType)
931 # get methods is_ok, next, item
932 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
933 if ikdef
== null then
934 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
937 self.method_is_ok
= ikdef
939 var itemdef
= v
.get_method
(self, ittype
, "item", false)
940 if itemdef
== null then
941 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
944 self.method_item
= itemdef
946 var nextdef
= v
.get_method
(self, ittype
, "next", false)
947 if nextdef
== null then
948 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
951 self.method_next
= nextdef
953 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
956 var keydef
= v
.get_method
(self, ittype
, "key", false)
957 if keydef
== null then
958 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
961 self.method_key
= keydef
964 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
965 var variable
= variables
.first
966 var vtype
= variable
.declared_type
.as(not null)
968 if n_expr
isa AOrangeExpr then
969 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
971 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
974 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
978 redef fun accept_typing
(v
)
980 var mtype
= v
.visit_expr
(n_expr
)
981 if mtype
== null then return
983 self.do_type_iterator
(v
, mtype
)
985 v
.visit_stmt
(n_block
)
990 redef class AAssertExpr
991 redef fun accept_typing
(v
)
993 v
.visit_expr_bool
(n_expr
)
1001 redef fun accept_typing
(v
)
1003 v
.visit_expr_bool
(n_expr
)
1004 v
.visit_expr_bool
(n_expr2
)
1005 self.mtype
= v
.type_bool
(self)
1009 redef class AImpliesExpr
1010 redef fun accept_typing
(v
)
1012 v
.visit_expr_bool
(n_expr
)
1013 v
.visit_expr_bool
(n_expr2
)
1014 self.mtype
= v
.type_bool
(self)
1018 redef class AAndExpr
1019 redef fun accept_typing
(v
)
1021 v
.visit_expr_bool
(n_expr
)
1022 v
.visit_expr_bool
(n_expr2
)
1023 self.mtype
= v
.type_bool
(self)
1028 redef class ANotExpr
1029 redef fun accept_typing
(v
)
1031 v
.visit_expr_bool
(n_expr
)
1032 self.mtype
= v
.type_bool
(self)
1036 redef class AOrElseExpr
1037 redef fun accept_typing
(v
)
1039 var t1
= v
.visit_expr
(n_expr
)
1040 var t2
= v
.visit_expr
(n_expr2
)
1042 if t1
== null or t2
== null then
1046 t1
= t1
.as_notnullable
1048 var t
= v
.merge_types
(self, [t1
, t2
])
1050 t
= v
.mmodule
.object_type
1051 if t2
isa MNullableType then
1054 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1060 redef class ATrueExpr
1061 redef fun accept_typing
(v
)
1063 self.mtype
= v
.type_bool
(self)
1067 redef class AFalseExpr
1068 redef fun accept_typing
(v
)
1070 self.mtype
= v
.type_bool
(self)
1074 redef class AIntExpr
1075 redef fun accept_typing
(v
)
1077 var mclass
= v
.get_mclass
(self, "Int")
1078 if mclass
== null then return # Forward error
1079 self.mtype
= mclass
.mclass_type
1083 redef class AFloatExpr
1084 redef fun accept_typing
(v
)
1086 var mclass
= v
.get_mclass
(self, "Float")
1087 if mclass
== null then return # Forward error
1088 self.mtype
= mclass
.mclass_type
1092 redef class ACharExpr
1093 redef fun accept_typing
(v
)
1095 var mclass
= v
.get_mclass
(self, "Char")
1096 if mclass
== null then return # Forward error
1097 self.mtype
= mclass
.mclass_type
1101 redef class AStringFormExpr
1102 redef fun accept_typing
(v
)
1104 var mclass
= v
.get_mclass
(self, "String")
1105 if mclass
== null then return # Forward error
1106 self.mtype
= mclass
.mclass_type
1110 redef class ASuperstringExpr
1111 redef fun accept_typing
(v
)
1113 var mclass
= v
.get_mclass
(self, "String")
1114 if mclass
== null then return # Forward error
1115 self.mtype
= mclass
.mclass_type
1116 for nexpr
in self.n_exprs
do
1117 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1122 redef class AArrayExpr
1123 var with_capacity_callsite
: nullable CallSite
1124 var push_callsite
: nullable CallSite
1126 redef fun accept_typing
(v
)
1128 var mtype
: nullable MType = null
1129 var ntype
= self.n_type
1130 if ntype
!= null then
1131 mtype
= v
.resolve_mtype
(ntype
)
1132 if mtype
== null then return # Skip error
1134 var mtypes
= new Array[nullable MType]
1136 for e
in self.n_exprs
.n_exprs
do
1137 var t
= v
.visit_expr
(e
)
1141 if mtype
!= null then
1142 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1143 if t
== mtype
then useless
= true
1148 if mtype
== null then
1149 mtype
= v
.merge_types
(self, mtypes
)
1151 if mtype
== null then
1152 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1156 assert ntype
!= null
1157 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1159 var mclass
= v
.get_mclass
(self, "Array")
1160 if mclass
== null then return # Forward error
1161 var array_mtype
= mclass
.get_mtype
([mtype
])
1163 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1164 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1166 self.mtype
= array_mtype
1170 redef class ARangeExpr
1171 var init_callsite
: nullable CallSite
1173 redef fun accept_typing
(v
)
1175 var discrete_class
= v
.get_mclass
(self, "Discrete")
1176 if discrete_class
== null then return # Forward error
1177 var discrete_type
= discrete_class
.intro
.bound_mtype
1178 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1179 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1180 if t1
== null or t2
== null then return
1181 var mclass
= v
.get_mclass
(self, "Range")
1182 if mclass
== null then return # Forward error
1184 if v
.is_subtype
(t1
, t2
) then
1185 mtype
= mclass
.get_mtype
([t2
])
1186 else if v
.is_subtype
(t2
, t1
) then
1187 mtype
= mclass
.get_mtype
([t1
])
1189 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1195 # get the constructor
1197 if self isa ACrangeExpr then
1198 callsite
= v
.get_method
(self, mtype
, "init", false)
1199 else if self isa AOrangeExpr then
1200 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1204 init_callsite
= callsite
1208 redef class ANullExpr
1209 redef fun accept_typing
(v
)
1211 self.mtype
= v
.mmodule
.model
.null_type
1215 redef class AIsaExpr
1216 # The static type to cast to.
1217 # (different from the static type of the expression that is `Bool`).
1218 var cast_type
: nullable MType
1219 redef fun accept_typing
(v
)
1221 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1222 self.cast_type
= mtype
1224 var variable
= self.n_expr
.its_variable
1225 if variable
!= null then
1226 var orig
= self.n_expr
.mtype
1227 var from
= if orig
!= null then orig
.to_s
else "invalid"
1228 var to
= if mtype
!= null then mtype
.to_s
else "invalid"
1229 #debug("adapt {variable}: {from} -> {to}")
1230 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1233 self.mtype
= v
.type_bool
(self)
1237 redef class AAsCastExpr
1238 redef fun accept_typing
(v
)
1240 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1244 redef class AAsNotnullExpr
1245 redef fun accept_typing
(v
)
1247 var mtype
= v
.visit_expr
(self.n_expr
)
1248 if mtype
== null then return # Forward error
1250 if mtype
isa MNullType then
1251 v
.error
(self, "Type error: as(not null) on null")
1254 if mtype
isa MNullableType then
1255 self.mtype
= mtype
.mtype
1260 if mtype
isa MClassType then
1261 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1264 assert mtype
.need_anchor
1265 var u
= v
.anchor_to
(mtype
)
1266 if not u
isa MNullableType then
1267 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1273 redef class AProxyExpr
1274 redef fun accept_typing
(v
)
1276 self.mtype
= v
.visit_expr
(self.n_expr
)
1280 redef class ASelfExpr
1281 redef var its_variable
: nullable Variable
1282 redef fun accept_typing
(v
)
1284 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1285 v
.error
(self, "Error: self cannot be used in top-level method.")
1287 var variable
= v
.selfvariable
1288 self.its_variable
= variable
1289 self.mtype
= v
.get_variable
(self, variable
)
1293 ## MESSAGE SENDING AND PROPERTY
1295 redef class ASendExpr
1296 # The property invoked by the send.
1297 var callsite
: nullable CallSite
1299 redef fun accept_typing
(v
)
1301 var recvtype
= v
.visit_expr
(self.n_expr
)
1302 var name
= self.property_name
1304 if recvtype
== null then return # Forward error
1305 if recvtype
isa MNullType then
1306 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1310 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1311 if callsite
== null then return
1312 self.callsite
= callsite
1313 var msignature
= callsite
.msignature
1315 var args
= compute_raw_arguments
1317 callsite
.check_signature
(v
, args
)
1319 if callsite
.mproperty
.is_init
then
1320 var vmpropdef
= v
.mpropdef
1321 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1322 v
.error
(self, "Can call a init only in another init")
1324 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1325 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1329 var ret
= msignature
.return_mtype
1333 self.is_typed
= true
1337 # The name of the property
1338 # Each subclass simply provide the correct name.
1339 private fun property_name
: String is abstract
1341 # An array of all arguments (excluding self)
1342 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1344 private fun compute_raw_arguments
: Array[AExpr] is abstract
1347 redef class ABinopExpr
1348 redef fun compute_raw_arguments
do return [n_expr2
]
1351 redef fun property_name
do return "=="
1352 redef fun accept_typing
(v
)
1356 var variable
= self.n_expr
.its_variable
1357 if variable
== null then return
1358 var mtype
= self.n_expr2
.mtype
1359 if not mtype
isa MNullType then return
1360 var vartype
= v
.get_variable
(self, variable
)
1361 if not vartype
isa MNullableType then return
1362 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1363 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1364 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
1368 redef fun property_name
do return "!="
1369 redef fun accept_typing
(v
)
1373 var variable
= self.n_expr
.its_variable
1374 if variable
== null then return
1375 var mtype
= self.n_expr2
.mtype
1376 if not mtype
isa MNullType then return
1377 var vartype
= v
.get_variable
(self, variable
)
1378 if not vartype
isa MNullableType then return
1379 self.after_flow_context
.when_false
.set_var
(variable
, mtype
)
1380 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1381 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1385 redef fun property_name
do return "<"
1388 redef fun property_name
do return "<="
1391 redef fun property_name
do return "<<"
1394 redef fun property_name
do return ">"
1397 redef fun property_name
do return ">="
1400 redef fun property_name
do return ">>"
1402 redef class APlusExpr
1403 redef fun property_name
do return "+"
1405 redef class AMinusExpr
1406 redef fun property_name
do return "-"
1408 redef class AStarshipExpr
1409 redef fun property_name
do return "<=>"
1411 redef class AStarExpr
1412 redef fun property_name
do return "*"
1414 redef class AStarstarExpr
1415 redef fun property_name
do return "**"
1417 redef class ASlashExpr
1418 redef fun property_name
do return "/"
1420 redef class APercentExpr
1421 redef fun property_name
do return "%"
1424 redef class AUminusExpr
1425 redef fun property_name
do return "unary -"
1426 redef fun compute_raw_arguments
do return new Array[AExpr]
1430 redef class ACallExpr
1431 redef fun property_name
do return n_id
.text
1432 redef fun compute_raw_arguments
do return n_args
.to_a
1435 redef class ACallAssignExpr
1436 redef fun property_name
do return n_id
.text
+ "="
1437 redef fun compute_raw_arguments
1439 var res
= n_args
.to_a
1445 redef class ABraExpr
1446 redef fun property_name
do return "[]"
1447 redef fun compute_raw_arguments
do return n_args
.to_a
1450 redef class ABraAssignExpr
1451 redef fun property_name
do return "[]="
1452 redef fun compute_raw_arguments
1454 var res
= n_args
.to_a
1460 redef class ASendReassignFormExpr
1461 # The property invoked for the writing
1462 var write_callsite
: nullable CallSite
1464 redef fun accept_typing
(v
)
1466 var recvtype
= v
.visit_expr
(self.n_expr
)
1467 var name
= self.property_name
1469 if recvtype
== null then return # Forward error
1470 if recvtype
isa MNullType then
1471 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1475 var for_self
= self.n_expr
isa ASelfExpr
1476 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1478 if callsite
== null then return
1479 self.callsite
= callsite
1481 var args
= compute_raw_arguments
1483 callsite
.check_signature
(v
, args
)
1485 var readtype
= callsite
.msignature
.return_mtype
1486 if readtype
== null then
1487 v
.error
(self, "Error: {name} is not a function")
1491 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1492 if wcallsite
== null then return
1493 self.write_callsite
= wcallsite
1495 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1496 if wtype
== null then return
1498 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1499 args
.add
(self.n_value
)
1500 wcallsite
.check_signature
(v
, args
)
1502 self.is_typed
= true
1506 redef class ACallReassignExpr
1507 redef fun property_name
do return n_id
.text
1508 redef fun compute_raw_arguments
do return n_args
.to_a
1511 redef class ABraReassignExpr
1512 redef fun property_name
do return "[]"
1513 redef fun compute_raw_arguments
do return n_args
.to_a
1516 redef class AInitExpr
1517 redef fun property_name
do return "init"
1518 redef fun compute_raw_arguments
do return n_args
.to_a
1522 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1527 redef class ASuperExpr
1528 # The method to call if the super is in fact a 'super init call'
1529 # Note: if the super is a normal call-next-method, then this attribute is null
1530 var callsite
: nullable CallSite
1532 # The method to call is the super is a standard `call-next-method` super-call
1533 # Note: if the super is a special super-init-call, then this attribute is null
1534 var mpropdef
: nullable MMethodDef
1536 redef fun accept_typing
(v
)
1538 var anchor
= v
.anchor
1539 assert anchor
!= null
1540 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1541 assert recvtype
!= null
1542 var mproperty
= v
.mpropdef
.mproperty
1543 if not mproperty
isa MMethod then
1544 v
.error
(self, "Error: super only usable in a method")
1547 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1548 if superprops
.length
== 0 then
1549 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1550 process_superinit
(v
)
1553 v
.error
(self, "Error: No super method to call for {mproperty}.")
1556 # FIXME: covariance of return type in linear extension?
1557 var superprop
= superprops
.first
1559 var msignature
= superprop
.msignature
.as(not null)
1560 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1561 var args
= self.n_args
.to_a
1562 if args
.length
> 0 then
1563 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1565 self.mtype
= msignature
.return_mtype
1566 self.is_typed
= true
1567 v
.mpropdef
.has_supercall
= true
1568 mpropdef
= v
.mpropdef
.as(MMethodDef)
1571 private fun process_superinit
(v
: TypeVisitor)
1573 var anchor
= v
.anchor
1574 assert anchor
!= null
1575 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1576 assert recvtype
!= null
1577 var mpropdef
= v
.mpropdef
1578 assert mpropdef
isa MMethodDef
1579 var mproperty
= mpropdef
.mproperty
1580 var superprop
: nullable MMethodDef = null
1581 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1582 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1583 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1584 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1585 if candidate
== null then
1586 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1587 continue # Try next super-class
1589 if superprop
!= null and candidate
.is_root_init
then
1592 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1593 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1596 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1597 if superprop
!= null and superprop
.mproperty
== candidate
then
1598 if superprop
== candidatedefs
.first
then continue
1599 candidatedefs
.add
(superprop
)
1601 if candidatedefs
.length
> 1 then
1602 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1605 superprop
= candidatedefs
.first
1607 if superprop
== null then
1608 v
.error
(self, "Error: No super method to call for {mproperty}.")
1612 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1613 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1615 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1616 self.callsite
= callsite
1618 var args
= self.n_args
.to_a
1619 if args
.length
> 0 then
1620 callsite
.check_signature
(v
, args
)
1622 # Check there is at least enough parameters
1623 if mpropdef
.msignature
.arity
< msignature
.arity
then
1624 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1627 # Check that each needed parameter is conform
1629 for sp
in msignature
.mparameters
do
1630 var p
= mpropdef
.msignature
.mparameters
[i
]
1631 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1632 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1639 self.is_typed
= true
1645 redef class ANewExpr
1646 # The constructor invoked by the new.
1647 var callsite
: nullable CallSite
1649 redef fun accept_typing
(v
)
1651 var recvtype
= v
.resolve_mtype
(self.n_type
)
1652 if recvtype
== null then return
1653 self.mtype
= recvtype
1655 if not recvtype
isa MClassType then
1656 if recvtype
isa MNullableType then
1657 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1660 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1664 if recvtype
.mclass
.kind
== abstract_kind
then
1665 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1667 else if recvtype
.mclass
.kind
== interface_kind
then
1668 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1680 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1681 if callsite
== null then return
1683 self.callsite
= callsite
1685 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1686 v
.error
(self, "Error: {name} is not a constructor.")
1690 var args
= n_args
.to_a
1691 callsite
.check_signature
(v
, args
)
1697 redef class AAttrFormExpr
1698 # The attribute acceded.
1699 var mproperty
: nullable MAttribute
1701 # The static type of the attribute.
1702 var attr_type
: nullable MType
1704 # Resolve the attribute acceded.
1705 private fun resolve_property
(v
: TypeVisitor)
1707 var recvtype
= v
.visit_expr
(self.n_expr
)
1708 if recvtype
== null then return # Skip error
1709 var name
= self.n_id
.text
1710 if recvtype
isa MNullType then
1711 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1715 var unsafe_type
= v
.anchor_to
(recvtype
)
1716 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1717 if mproperty
== null then
1718 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1721 assert mproperty
isa MAttribute
1722 self.mproperty
= mproperty
1724 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1725 assert mpropdefs
.length
== 1
1726 var mpropdef
= mpropdefs
.first
1727 var attr_type
= mpropdef
.static_mtype
.as(not null)
1728 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1729 self.attr_type
= attr_type
1733 redef class AAttrExpr
1734 redef fun accept_typing
(v
)
1736 self.resolve_property
(v
)
1737 self.mtype
= self.attr_type
1742 redef class AAttrAssignExpr
1743 redef fun accept_typing
(v
)
1745 self.resolve_property
(v
)
1746 var mtype
= self.attr_type
1748 v
.visit_expr_subtype
(self.n_value
, mtype
)
1749 self.is_typed
= true
1753 redef class AAttrReassignExpr
1754 redef fun accept_typing
(v
)
1756 self.resolve_property
(v
)
1757 var mtype
= self.attr_type
1758 if mtype
== null then return # Skip error
1760 self.resolve_reassignment
(v
, mtype
, mtype
)
1762 self.is_typed
= true
1766 redef class AIssetAttrExpr
1767 redef fun accept_typing
(v
)
1769 self.resolve_property
(v
)
1770 var mtype
= self.attr_type
1771 if mtype
== null then return # Skip error
1773 var recvtype
= self.n_expr
.mtype
.as(not null)
1774 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1775 if bound
isa MNullableType then
1776 v
.error
(self, "Error: isset on a nullable attribute.")
1778 self.mtype
= v
.type_bool
(self)
1784 redef class ADebugTypeExpr
1785 redef fun accept_typing
(v
)
1787 var expr
= v
.visit_expr
(self.n_expr
)
1788 if expr
== null then return
1789 var unsafe
= v
.anchor_to
(expr
)
1790 var ntype
= self.n_type
1791 var mtype
= v
.resolve_mtype
(ntype
)
1792 if mtype
!= null and mtype
!= expr
then
1793 var umtype
= v
.anchor_to
(mtype
)
1794 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1796 self.is_typed
= true