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
= 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
399 if t1
== null then continue # return null
402 if t2
== null then continue # return null
403 if t2
isa MNullableType or t2
isa MNullType then
406 if not is_subtype
(t2
, t1
) then found
= false
409 #print "merge {col.join(" ")} -> {t1}"
413 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
418 # A specific method call site with its associated informations.
420 # The associated node for location
423 # The static type of the receiver (possibly unresolved)
426 # The module where the callsite is present
429 # The anchor to use with `recv` or `msignature`
430 var anchor
: nullable MClassType
432 # Is the receiver self?
433 # If "for_self", virtual types of the signature are kept
434 # If "not_for_self", virtual type are erased
435 var recv_is_self
: Bool
437 # The designated method
438 var mproperty
: MMethod
440 # The statically designated method definition
441 # The most specif one, it is.
442 var mpropdef
: MMethodDef
444 # The resolved signature for the receiver
445 var msignature
: MSignature
447 # Is a implicit cast required on erasure typing policy?
448 var erasure_cast
: Bool
450 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
452 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
457 # The declared type of the variable
458 var declared_type
: nullable MType
461 redef class FlowContext
462 # Store changes of types because of type evolution
463 private var vars
= new HashMap[Variable, nullable MType]
464 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
466 # Adapt the variable to a static type
467 # Warning1: do not modify vars directly.
468 # Warning2: sub-flow may have cached a unadapted variable
469 private fun set_var
(variable
: Variable, mtype
: nullable MType)
471 self.vars
[variable
] = mtype
472 self.cache
.keys
.remove
(variable
)
475 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
477 if cache
.has_key
(variable
) then
478 return cache
[variable
]
480 var res
: nullable Array[nullable MType] = null
481 if vars
.has_key
(variable
) then
482 var mtype
= vars
[variable
]
484 else if self.previous
.is_empty
then
486 res
= [variable
.declared_type
]
488 for flow
in self.previous
do
489 if flow
.is_unreachable
then continue
490 var r2
= flow
.collect_types
(variable
)
491 if r2
== null then continue
496 if not res
.has
(t
) then res
.add
(t
)
501 cache
[variable
] = res
507 # The entry point of the whole typing analysis
508 fun do_typing
(modelbuilder
: ModelBuilder)
512 # The variable associated to the receiver (if any)
513 var selfvariable
: nullable Variable
516 redef class AMethPropdef
517 redef fun do_typing
(modelbuilder
: ModelBuilder)
519 var nblock
= self.n_block
520 if nblock
== null then return
522 var mpropdef
= self.mpropdef
.as(not null)
523 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
524 self.selfvariable
= v
.selfvariable
526 var mmethoddef
= self.mpropdef
.as(not null)
527 for i
in [0..mmethoddef
.msignature
.arity
[ do
528 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
529 if mmethoddef
.msignature
.vararg_rank
== i
then
530 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
531 if arrayclass
== null then return # Skip error
532 mtype
= arrayclass
.get_mtype
([mtype
])
534 var variable
= self.n_signature
.n_params
[i
].variable
535 assert variable
!= null
536 variable
.declared_type
= mtype
540 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
541 # We reach the end of the function without having a return, it is bad
542 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
547 redef class AAttrPropdef
548 redef fun do_typing
(modelbuilder
: ModelBuilder)
550 var mpropdef
= self.mpropdef
.as(not null)
551 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
552 self.selfvariable
= v
.selfvariable
554 var nexpr
= self.n_expr
555 if nexpr
!= null then
556 var mtype
= self.mpropdef
.static_mtype
557 v
.visit_expr_subtype
(nexpr
, mtype
)
565 # The static type of the expression.
566 # null if self is a statement or in case of error
567 var mtype
: nullable MType = null
569 # Is the statement correctly typed?
570 # Used to distinguish errors and statements when `mtype == null`
571 var is_typed
: Bool = false
573 # If required, the following implicit cast `.as(XXX)`
574 # Such a cast may by required after evaluating the expression when
575 # a unsafe operation is detected (silently accepted by the Nit language).
576 # The attribute is computed by `check_subtype`
577 var implicit_cast_to
: nullable MType = null
579 # Return the variable read (if any)
580 # Used to perform adaptive typing
581 fun its_variable
: nullable Variable do return null
583 private fun accept_typing
(v
: TypeVisitor)
585 v
.error
(self, "no implemented accept_typing for {self.class_name}")
589 redef class ABlockExpr
590 redef fun accept_typing
(v
)
592 for e
in self.n_expr
do v
.visit_stmt
(e
)
596 # The type of a blockexpr is the one of the last expression (or null if empty)
599 if self.n_expr
.is_empty
then return null
600 return self.n_expr
.last
.mtype
604 redef class AVardeclExpr
605 redef fun accept_typing
(v
)
607 var variable
= self.variable
608 if variable
== null then return # Skip error
610 var ntype
= self.n_type
611 var mtype
: nullable MType
612 if ntype
== null then
615 mtype
= v
.resolve_mtype
(ntype
)
616 if mtype
== null then return # Skip error
619 var nexpr
= self.n_expr
620 if nexpr
!= null then
621 if mtype
!= null then
622 v
.visit_expr_subtype
(nexpr
, mtype
)
624 mtype
= v
.visit_expr
(nexpr
)
625 if mtype
== null then return # Skip error
630 if mtype
== null or mtype
isa MNullType then
631 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
632 if mtype
== null then mtype
= decltype
635 variable
.declared_type
= decltype
636 v
.set_variable
(self, variable
, mtype
)
638 #debug("var {variable}: {mtype}")
645 redef fun its_variable
do return self.variable
646 redef fun accept_typing
(v
)
648 var variable
= self.variable
649 if variable
== null then return # Skip error
651 var mtype
= v
.get_variable
(self, variable
)
652 if mtype
!= null then
653 #debug("{variable} is {mtype}")
655 #debug("{variable} is untyped")
662 redef class AVarAssignExpr
663 redef fun accept_typing
(v
)
665 var variable
= self.variable
666 assert variable
!= null
668 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
670 v
.set_variable
(self, variable
, mtype
)
676 redef class AReassignFormExpr
677 # The method designed by the reassign operator.
678 var reassign_callsite
: nullable CallSite
680 var read_type
: nullable MType = null
682 # Determine the `reassign_property`
683 # `readtype` is the type of the reading of the left value.
684 # `writetype` is the type of the writing of the left value.
685 # (Because of `ACallReassignExpr`, both can be different.
686 # Return the static type of the value to store.
687 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
689 var reassign_name
: String
690 if self.n_assign_op
isa APlusAssignOp then
692 else if self.n_assign_op
isa AMinusAssignOp then
698 self.read_type
= readtype
700 if readtype
isa MNullType then
701 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
705 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
706 if callsite
== null then return null # Skip error
707 self.reassign_callsite
= callsite
709 var msignature
= callsite
.msignature
710 var rettype
= msignature
.return_mtype
711 assert msignature
.arity
== 1 and rettype
!= null
713 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
714 if value_type
== null then return null # Skip error
716 v
.check_subtype
(self, rettype
, writetype
)
721 redef class AVarReassignExpr
722 redef fun accept_typing
(v
)
724 var variable
= self.variable
725 assert variable
!= null
727 var readtype
= v
.get_variable
(self, variable
)
728 if readtype
== null then return
732 var writetype
= variable
.declared_type
733 if writetype
== null then return
735 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
737 v
.set_variable
(self, variable
, rettype
)
744 redef class AContinueExpr
745 redef fun accept_typing
(v
)
747 var nexpr
= self.n_expr
748 if nexpr
!= null then
755 redef class ABreakExpr
756 redef fun accept_typing
(v
)
758 var nexpr
= self.n_expr
759 if nexpr
!= null then
766 redef class AReturnExpr
767 redef fun accept_typing
(v
)
769 var nexpr
= self.n_expr
770 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
771 if nexpr
!= null then
772 if ret_type
!= null then
773 v
.visit_expr_subtype
(nexpr
, ret_type
)
776 v
.error
(self, "Error: Return with value in a procedure.")
778 else if ret_type
!= null then
779 v
.error
(self, "Error: Return without value in a function.")
785 redef class AAbortExpr
786 redef fun accept_typing
(v
)
793 redef fun accept_typing
(v
)
795 v
.visit_expr_bool
(n_expr
)
803 redef class AIfexprExpr
804 redef fun accept_typing
(v
)
806 v
.visit_expr_bool
(n_expr
)
808 var t1
= v
.visit_expr
(n_then
)
809 var t2
= v
.visit_expr
(n_else
)
811 if t1
== null or t2
== null then
815 var t
= v
.merge_types
(self, [t1
, t2
])
817 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
824 redef fun accept_typing
(v
)
826 v
.visit_stmt
(n_block
)
831 redef class AWhileExpr
832 redef fun accept_typing
(v
)
834 v
.visit_expr_bool
(n_expr
)
836 v
.visit_stmt
(n_block
)
841 redef class ALoopExpr
842 redef fun accept_typing
(v
)
844 v
.visit_stmt
(n_block
)
850 var coltype
: nullable MClassType
852 var method_iterator
: nullable CallSite
853 var method_is_ok
: nullable CallSite
854 var method_item
: nullable CallSite
855 var method_next
: nullable CallSite
856 var method_key
: nullable CallSite
857 var method_finish
: nullable CallSite
859 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
861 if mtype
isa MNullType then
862 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
867 var objcla
= v
.get_mclass
(self, "Object")
868 if objcla
== null then return
870 # check iterator method
871 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
872 if itdef
== null then
873 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
876 self.method_iterator
= itdef
878 # check that iterator return something
879 var ittype
= itdef
.msignature
.return_mtype
880 if ittype
== null then
881 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
886 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
887 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
891 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
893 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
894 var variables
= self.variables
895 if variables
.length
!= 1 then
896 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
898 variables
.first
.declared_type
= coltype
.arguments
.first
903 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
905 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
906 var variables
= self.variables
907 if variables
.length
!= 2 then
908 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
910 variables
[0].declared_type
= coltype
.arguments
[0]
911 variables
[1].declared_type
= coltype
.arguments
[1]
916 if not is_col
and not is_map
then
917 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
921 # anchor formal and virtual types
922 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
924 mtype
= mtype
.as_notnullable
925 self.coltype
= mtype
.as(MClassType)
927 # get methods is_ok, next, item
928 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
929 if ikdef
== null then
930 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
933 self.method_is_ok
= ikdef
935 var itemdef
= v
.get_method
(self, ittype
, "item", false)
936 if itemdef
== null then
937 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
940 self.method_item
= itemdef
942 var nextdef
= v
.get_method
(self, ittype
, "next", false)
943 if nextdef
== null then
944 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
947 self.method_next
= nextdef
949 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
952 var keydef
= v
.get_method
(self, ittype
, "key", false)
953 if keydef
== null then
954 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
957 self.method_key
= keydef
961 redef fun accept_typing
(v
)
963 var mtype
= v
.visit_expr
(n_expr
)
964 if mtype
== null then return
966 self.do_type_iterator
(v
, mtype
)
968 v
.visit_stmt
(n_block
)
973 redef class AAssertExpr
974 redef fun accept_typing
(v
)
976 v
.visit_expr_bool
(n_expr
)
984 redef fun accept_typing
(v
)
986 v
.visit_expr_bool
(n_expr
)
987 v
.visit_expr_bool
(n_expr2
)
988 self.mtype
= v
.type_bool
(self)
992 redef class AImpliesExpr
993 redef fun accept_typing
(v
)
995 v
.visit_expr_bool
(n_expr
)
996 v
.visit_expr_bool
(n_expr2
)
997 self.mtype
= v
.type_bool
(self)
1001 redef class AAndExpr
1002 redef fun accept_typing
(v
)
1004 v
.visit_expr_bool
(n_expr
)
1005 v
.visit_expr_bool
(n_expr2
)
1006 self.mtype
= v
.type_bool
(self)
1011 redef class ANotExpr
1012 redef fun accept_typing
(v
)
1014 v
.visit_expr_bool
(n_expr
)
1015 self.mtype
= v
.type_bool
(self)
1019 redef class AOrElseExpr
1020 redef fun accept_typing
(v
)
1022 var t1
= v
.visit_expr
(n_expr
)
1023 var t2
= v
.visit_expr
(n_expr2
)
1025 if t1
== null or t2
== null then
1029 t1
= t1
.as_notnullable
1031 var t
= v
.merge_types
(self, [t1
, t2
])
1033 t
= v
.mmodule
.object_type
1034 if t2
isa MNullableType then
1037 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1043 redef class ATrueExpr
1044 redef fun accept_typing
(v
)
1046 self.mtype
= v
.type_bool
(self)
1050 redef class AFalseExpr
1051 redef fun accept_typing
(v
)
1053 self.mtype
= v
.type_bool
(self)
1057 redef class AIntExpr
1058 redef fun accept_typing
(v
)
1060 var mclass
= v
.get_mclass
(self, "Int")
1061 if mclass
== null then return # Forward error
1062 self.mtype
= mclass
.mclass_type
1066 redef class AFloatExpr
1067 redef fun accept_typing
(v
)
1069 var mclass
= v
.get_mclass
(self, "Float")
1070 if mclass
== null then return # Forward error
1071 self.mtype
= mclass
.mclass_type
1075 redef class ACharExpr
1076 redef fun accept_typing
(v
)
1078 var mclass
= v
.get_mclass
(self, "Char")
1079 if mclass
== null then return # Forward error
1080 self.mtype
= mclass
.mclass_type
1084 redef class AStringFormExpr
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
1093 redef class ASuperstringExpr
1094 redef fun accept_typing
(v
)
1096 var mclass
= v
.get_mclass
(self, "String")
1097 if mclass
== null then return # Forward error
1098 self.mtype
= mclass
.mclass_type
1099 for nexpr
in self.n_exprs
do
1100 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1105 redef class AArrayExpr
1106 var with_capacity_callsite
: nullable CallSite
1107 var push_callsite
: nullable CallSite
1109 redef fun accept_typing
(v
)
1111 var mtype
: nullable MType = null
1112 var ntype
= self.n_type
1113 if ntype
!= null then
1114 mtype
= v
.resolve_mtype
(ntype
)
1115 if mtype
== null then return # Skip error
1117 var mtypes
= new Array[nullable MType]
1119 for e
in self.n_exprs
.n_exprs
do
1120 var t
= v
.visit_expr
(e
)
1124 if mtype
!= null then
1125 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1126 if t
== mtype
then useless
= true
1131 if mtype
== null then
1132 mtype
= v
.merge_types
(self, mtypes
)
1134 if mtype
== null then
1135 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1139 assert ntype
!= null
1140 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1142 var mclass
= v
.get_mclass
(self, "Array")
1143 if mclass
== null then return # Forward error
1144 var array_mtype
= mclass
.get_mtype
([mtype
])
1146 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1147 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1149 self.mtype
= array_mtype
1153 redef class ARangeExpr
1154 var init_callsite
: nullable CallSite
1156 redef fun accept_typing
(v
)
1158 var discrete_class
= v
.get_mclass
(self, "Discrete")
1159 if discrete_class
== null then return # Forward error
1160 var discrete_type
= discrete_class
.intro
.bound_mtype
1161 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1162 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1163 if t1
== null or t2
== null then return
1164 var mclass
= v
.get_mclass
(self, "Range")
1165 if mclass
== null then return # Forward error
1167 if v
.is_subtype
(t1
, t2
) then
1168 mtype
= mclass
.get_mtype
([t2
])
1169 else if v
.is_subtype
(t2
, t1
) then
1170 mtype
= mclass
.get_mtype
([t1
])
1172 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1178 # get the constructor
1180 if self isa ACrangeExpr then
1181 callsite
= v
.get_method
(self, mtype
, "init", false)
1182 else if self isa AOrangeExpr then
1183 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1187 init_callsite
= callsite
1191 redef class ANullExpr
1192 redef fun accept_typing
(v
)
1194 self.mtype
= v
.mmodule
.model
.null_type
1198 redef class AIsaExpr
1199 # The static type to cast to.
1200 # (different from the static type of the expression that is `Bool`).
1201 var cast_type
: nullable MType
1202 redef fun accept_typing
(v
)
1204 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1205 self.cast_type
= mtype
1207 var variable
= self.n_expr
.its_variable
1208 if variable
!= null then
1209 #var orig = self.n_expr.mtype
1210 #var from = if orig != null then orig.to_s else "invalid"
1211 #var to = if mtype != null then mtype.to_s else "invalid"
1212 #debug("adapt {variable}: {from} -> {to}")
1213 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1216 self.mtype
= v
.type_bool
(self)
1220 redef class AAsCastExpr
1221 redef fun accept_typing
(v
)
1223 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1227 redef class AAsNotnullExpr
1228 redef fun accept_typing
(v
)
1230 var mtype
= v
.visit_expr
(self.n_expr
)
1231 if mtype
== null then return # Forward error
1233 if mtype
isa MNullType then
1234 v
.error
(self, "Type error: as(not null) on null")
1237 if mtype
isa MNullableType then
1238 self.mtype
= mtype
.mtype
1243 if mtype
isa MClassType then
1244 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1247 assert mtype
.need_anchor
1248 var u
= v
.anchor_to
(mtype
)
1249 if not u
isa MNullableType then
1250 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1256 redef class AProxyExpr
1257 redef fun accept_typing
(v
)
1259 self.mtype
= v
.visit_expr
(self.n_expr
)
1263 redef class ASelfExpr
1264 redef var its_variable
: nullable Variable
1265 redef fun accept_typing
(v
)
1267 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1268 v
.error
(self, "Error: self cannot be used in top-level method.")
1270 var variable
= v
.selfvariable
1271 self.its_variable
= variable
1272 self.mtype
= v
.get_variable
(self, variable
)
1276 ## MESSAGE SENDING AND PROPERTY
1278 redef class ASendExpr
1279 # The property invoked by the send.
1280 var callsite
: nullable CallSite
1282 redef fun accept_typing
(v
)
1284 var recvtype
= v
.visit_expr
(self.n_expr
)
1285 var name
= self.property_name
1287 if recvtype
== null then return # Forward error
1288 if recvtype
isa MNullType then
1289 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1293 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1294 if callsite
== null then return
1295 self.callsite
= callsite
1296 var msignature
= callsite
.msignature
1298 var args
= compute_raw_arguments
1300 callsite
.check_signature
(v
, args
)
1302 if callsite
.mproperty
.is_init
then
1303 var vmpropdef
= v
.mpropdef
1304 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1305 v
.error
(self, "Can call a init only in another init")
1307 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1308 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1312 var ret
= msignature
.return_mtype
1316 self.is_typed
= true
1320 # The name of the property
1321 # Each subclass simply provide the correct name.
1322 private fun property_name
: String is abstract
1324 # An array of all arguments (excluding self)
1325 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1327 private fun compute_raw_arguments
: Array[AExpr] is abstract
1330 redef class ABinopExpr
1331 redef fun compute_raw_arguments
do return [n_expr2
]
1334 redef fun property_name
do return "=="
1335 redef fun accept_typing
(v
)
1339 var variable
= self.n_expr
.its_variable
1340 if variable
== null then return
1341 var mtype
= self.n_expr2
.mtype
1342 if not mtype
isa MNullType then return
1343 var vartype
= v
.get_variable
(self, variable
)
1344 if not vartype
isa MNullableType then return
1345 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1346 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1347 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
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_false
.set_var
(variable
, mtype
)
1363 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1364 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1368 redef fun property_name
do return "<"
1371 redef fun property_name
do return "<="
1374 redef fun property_name
do return "<<"
1377 redef fun property_name
do return ">"
1380 redef fun property_name
do return ">="
1383 redef fun property_name
do return ">>"
1385 redef class APlusExpr
1386 redef fun property_name
do return "+"
1388 redef class AMinusExpr
1389 redef fun property_name
do return "-"
1391 redef class AStarshipExpr
1392 redef fun property_name
do return "<=>"
1394 redef class AStarExpr
1395 redef fun property_name
do return "*"
1397 redef class AStarstarExpr
1398 redef fun property_name
do return "**"
1400 redef class ASlashExpr
1401 redef fun property_name
do return "/"
1403 redef class APercentExpr
1404 redef fun property_name
do return "%"
1407 redef class AUminusExpr
1408 redef fun property_name
do return "unary -"
1409 redef fun compute_raw_arguments
do return new Array[AExpr]
1413 redef class ACallExpr
1414 redef fun property_name
do return n_id
.text
1415 redef fun compute_raw_arguments
do return n_args
.to_a
1418 redef class ACallAssignExpr
1419 redef fun property_name
do return n_id
.text
+ "="
1420 redef fun compute_raw_arguments
1422 var res
= n_args
.to_a
1428 redef class ABraExpr
1429 redef fun property_name
do return "[]"
1430 redef fun compute_raw_arguments
do return n_args
.to_a
1433 redef class ABraAssignExpr
1434 redef fun property_name
do return "[]="
1435 redef fun compute_raw_arguments
1437 var res
= n_args
.to_a
1443 redef class ASendReassignFormExpr
1444 # The property invoked for the writing
1445 var write_callsite
: nullable CallSite
1447 redef fun accept_typing
(v
)
1449 var recvtype
= v
.visit_expr
(self.n_expr
)
1450 var name
= self.property_name
1452 if recvtype
== null then return # Forward error
1453 if recvtype
isa MNullType then
1454 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1458 var for_self
= self.n_expr
isa ASelfExpr
1459 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1461 if callsite
== null then return
1462 self.callsite
= callsite
1464 var args
= compute_raw_arguments
1466 callsite
.check_signature
(v
, args
)
1468 var readtype
= callsite
.msignature
.return_mtype
1469 if readtype
== null then
1470 v
.error
(self, "Error: {name} is not a function")
1474 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1475 if wcallsite
== null then return
1476 self.write_callsite
= wcallsite
1478 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1479 if wtype
== null then return
1481 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1482 args
.add
(self.n_value
)
1483 wcallsite
.check_signature
(v
, args
)
1485 self.is_typed
= true
1489 redef class ACallReassignExpr
1490 redef fun property_name
do return n_id
.text
1491 redef fun compute_raw_arguments
do return n_args
.to_a
1494 redef class ABraReassignExpr
1495 redef fun property_name
do return "[]"
1496 redef fun compute_raw_arguments
do return n_args
.to_a
1499 redef class AInitExpr
1500 redef fun property_name
do return "init"
1501 redef fun compute_raw_arguments
do return n_args
.to_a
1505 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1510 redef class ASuperExpr
1511 # The method to call if the super is in fact a 'super init call'
1512 # Note: if the super is a normal call-next-method, then this attribute is null
1513 var callsite
: nullable CallSite
1515 # The method to call is the super is a standard `call-next-method` super-call
1516 # Note: if the super is a special super-init-call, then this attribute is null
1517 var mpropdef
: nullable MMethodDef
1519 redef fun accept_typing
(v
)
1521 var anchor
= v
.anchor
1522 assert anchor
!= null
1523 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1524 assert recvtype
!= null
1525 var mproperty
= v
.mpropdef
.mproperty
1526 if not mproperty
isa MMethod then
1527 v
.error
(self, "Error: super only usable in a method")
1530 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1531 if superprops
.length
== 0 then
1532 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1533 process_superinit
(v
)
1536 v
.error
(self, "Error: No super method to call for {mproperty}.")
1539 # FIXME: covariance of return type in linear extension?
1540 var superprop
= superprops
.first
1542 var msignature
= superprop
.msignature
.as(not null)
1543 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1544 var args
= self.n_args
.to_a
1545 if args
.length
> 0 then
1546 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1548 self.mtype
= msignature
.return_mtype
1549 self.is_typed
= true
1550 v
.mpropdef
.has_supercall
= true
1551 mpropdef
= v
.mpropdef
.as(MMethodDef)
1554 private fun process_superinit
(v
: TypeVisitor)
1556 var anchor
= v
.anchor
1557 assert anchor
!= null
1558 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1559 assert recvtype
!= null
1560 var mpropdef
= v
.mpropdef
1561 assert mpropdef
isa MMethodDef
1562 var mproperty
= mpropdef
.mproperty
1563 var superprop
: nullable MMethodDef = null
1564 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1565 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1566 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1567 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1568 if candidate
== null then
1569 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1570 continue # Try next super-class
1572 if superprop
!= null and candidate
.is_root_init
then
1575 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1576 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1579 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1580 if superprop
!= null and superprop
.mproperty
== candidate
then
1581 if superprop
== candidatedefs
.first
then continue
1582 candidatedefs
.add
(superprop
)
1584 if candidatedefs
.length
> 1 then
1585 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1588 superprop
= candidatedefs
.first
1590 if superprop
== null then
1591 v
.error
(self, "Error: No super method to call for {mproperty}.")
1595 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1596 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1598 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1599 self.callsite
= callsite
1601 var args
= self.n_args
.to_a
1602 if args
.length
> 0 then
1603 callsite
.check_signature
(v
, args
)
1605 # Check there is at least enough parameters
1606 if mpropdef
.msignature
.arity
< msignature
.arity
then
1607 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1610 # Check that each needed parameter is conform
1612 for sp
in msignature
.mparameters
do
1613 var p
= mpropdef
.msignature
.mparameters
[i
]
1614 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1615 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1622 self.is_typed
= true
1628 redef class ANewExpr
1629 # The constructor invoked by the new.
1630 var callsite
: nullable CallSite
1632 redef fun accept_typing
(v
)
1634 var recvtype
= v
.resolve_mtype
(self.n_type
)
1635 if recvtype
== null then return
1636 self.mtype
= recvtype
1638 if not recvtype
isa MClassType then
1639 if recvtype
isa MNullableType then
1640 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1643 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1647 if recvtype
.mclass
.kind
== abstract_kind
then
1648 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1650 else if recvtype
.mclass
.kind
== interface_kind
then
1651 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1663 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1664 if callsite
== null then return
1666 self.callsite
= callsite
1668 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1669 v
.error
(self, "Error: {name} is not a constructor.")
1673 var args
= n_args
.to_a
1674 callsite
.check_signature
(v
, args
)
1680 redef class AAttrFormExpr
1681 # The attribute acceded.
1682 var mproperty
: nullable MAttribute
1684 # The static type of the attribute.
1685 var attr_type
: nullable MType
1687 # Resolve the attribute acceded.
1688 private fun resolve_property
(v
: TypeVisitor)
1690 var recvtype
= v
.visit_expr
(self.n_expr
)
1691 if recvtype
== null then return # Skip error
1692 var name
= self.n_id
.text
1693 if recvtype
isa MNullType then
1694 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1698 var unsafe_type
= v
.anchor_to
(recvtype
)
1699 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1700 if mproperty
== null then
1701 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1704 assert mproperty
isa MAttribute
1705 self.mproperty
= mproperty
1707 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1708 assert mpropdefs
.length
== 1
1709 var mpropdef
= mpropdefs
.first
1710 var attr_type
= mpropdef
.static_mtype
.as(not null)
1711 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1712 self.attr_type
= attr_type
1716 redef class AAttrExpr
1717 redef fun accept_typing
(v
)
1719 self.resolve_property
(v
)
1720 self.mtype
= self.attr_type
1725 redef class AAttrAssignExpr
1726 redef fun accept_typing
(v
)
1728 self.resolve_property
(v
)
1729 var mtype
= self.attr_type
1731 v
.visit_expr_subtype
(self.n_value
, mtype
)
1732 self.is_typed
= true
1736 redef class AAttrReassignExpr
1737 redef fun accept_typing
(v
)
1739 self.resolve_property
(v
)
1740 var mtype
= self.attr_type
1741 if mtype
== null then return # Skip error
1743 self.resolve_reassignment
(v
, mtype
, mtype
)
1745 self.is_typed
= true
1749 redef class AIssetAttrExpr
1750 redef fun accept_typing
(v
)
1752 self.resolve_property
(v
)
1753 var mtype
= self.attr_type
1754 if mtype
== null then return # Skip error
1756 var recvtype
= self.n_expr
.mtype
.as(not null)
1757 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1758 if bound
isa MNullableType then
1759 v
.error
(self, "Error: isset on a nullable attribute.")
1761 self.mtype
= v
.type_bool
(self)
1767 redef class ADebugTypeExpr
1768 redef fun accept_typing
(v
)
1770 var expr
= v
.visit_expr
(self.n_expr
)
1771 if expr
== null then return
1772 var unsafe
= v
.anchor_to
(expr
)
1773 var ntype
= self.n_type
1774 var mtype
= v
.resolve_mtype
(ntype
)
1775 if mtype
!= null and mtype
!= expr
then
1776 var umtype
= v
.anchor_to
(mtype
)
1777 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1779 self.is_typed
= true