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 = null
44 # The analyzed mclassdef
45 var mclassdef
: nullable MClassDef = null
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 # Currently only used for `new` factory since there is no valid receiver inside
56 var is_toplevel_context
= false
60 var mpropdef
= self.mpropdef
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_new
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 when `autocast` is true:
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, autocast
: Bool): nullable MType
113 if self.is_subtype
(sub
, sup
) then return sub
114 if autocast
and 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 if sub
.need_anchor
then
120 var u
= anchor_to
(sub
)
121 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}: {u}`.")
123 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}`.")
128 # Visit an expression and do not care about the return value
129 fun visit_stmt
(nexpr
: nullable AExpr)
131 if nexpr
== null then return
132 nexpr
.accept_typing
(self)
135 # Visit an expression and expects that it is not a statement
136 # Return the type of the expression
137 # Display an error and return null if:
138 # * the type cannot be determined or
139 # * `nexpr` is a statement
140 fun visit_expr
(nexpr
: AExpr): nullable MType
142 nexpr
.accept_typing
(self)
143 var mtype
= nexpr
.mtype
144 if mtype
!= null then return mtype
145 if not nexpr
.is_typed
then
146 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
147 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
148 nexpr
.debug
("No return type but no error.")
151 return null # forward error
153 self.error
(nexpr
, "Error: expected an expression.")
157 # Visit an expression and expect its static type is a least a `sup`
158 # Return the type of the expression or null if
159 # * the type cannot be determined or
160 # * `nexpr` is a statement or
161 # * `nexpr` is not a `sup`
162 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
164 var sub
= visit_expr
(nexpr
)
165 if sub
== null then return null # Forward error
167 if sup
== null then return null # Forward error
169 var res
= check_subtype
(nexpr
, sub
, sup
, true)
171 nexpr
.implicit_cast_to
= res
176 # Visit an expression and expect its static type is a `Bool`
177 # Return the type of the expression or null if
178 # * the type cannot be determined or
179 # * `nexpr` is a statement or
180 # * `nexpr` is not a `Bool`
181 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
183 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
187 fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
189 var sub
= visit_expr
(nexpr
)
190 if sub
== null then return null # Forward error
192 var sup
= self.resolve_mtype
(ntype
)
193 if sup
== null then return null # Forward error
196 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}`.")
197 else if self.is_subtype
(sub
, sup
) then
198 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}` since it is a `{sub}`.")
203 # Can `mtype` be null (up to the current knowledge)?
204 fun can_be_null
(mtype
: MType): Bool
206 if mtype
isa MNullableType or mtype
isa MNullType then return true
207 if mtype
isa MFormalType then
208 var x
= anchor_to
(mtype
)
209 if x
isa MNullableType or x
isa MNullType then return true
214 # Check that `mtype` can be null (up to the current knowledge).
216 # If not then display a `useless-null-test` warning on node and return false.
218 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
220 if can_be_null
(mtype
) then return true
222 if mtype
isa MFormalType then
223 var res
= anchor_to
(mtype
)
224 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
226 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
231 # Special verification on != and == for null
233 fun null_test
(anode
: ABinopExpr)
235 var mtype
= anode
.n_expr
.mtype
236 var mtype2
= anode
.n_expr2
.mtype
238 if mtype
== null or mtype2
== null then return
240 if not mtype2
isa MNullType then return
242 # Check of useless null
243 if not check_can_be_null
(anode
.n_expr
, mtype
) then return
245 if mtype
isa MNullType then
246 # Because of type adaptation, we cannot just stop here
247 # so return use `null` as a bottom type that will be merged easily (cf) `merge_types`
250 mtype
= mtype
.as_notnull
253 # Check for type adaptation
254 var variable
= anode
.n_expr
.its_variable
255 if variable
== null then return
257 # One is null (mtype2 see above) the other is not null
258 if anode
isa AEqExpr then
259 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype2
)
260 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype
)
261 else if anode
isa ANeExpr then
262 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype2
)
263 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype
)
269 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
271 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
274 fun resolve_mtype
(node
: AType): nullable MType
276 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
279 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
281 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
285 fun get_mclass
(node
: ANode, name
: String): nullable MClass
287 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
291 fun type_bool
(node
: ANode): nullable MType
293 var mclass
= self.get_mclass
(node
, "Bool")
294 if mclass
== null then return null
295 return mclass
.mclass_type
298 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
300 var unsafe_type
= self.anchor_to
(recvtype
)
302 #debug("recv: {recvtype} (aka {unsafe_type})")
303 if recvtype
isa MNullType then
304 # `null` only accepts some methods of object.
305 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
306 var objclass
= get_mclass
(node
, "Object")
307 if objclass
== null then return null # Forward error
308 unsafe_type
= objclass
.mclass_type
310 self.error
(node
, "Error: method `{name}` called on `null`.")
315 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
316 if name
== "new" and mproperty
== null then
318 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
321 if mproperty
== null then
323 self.modelbuilder
.error
(node
, "Error: method or variable `{name}` unknown in `{recvtype}`.")
324 else if recvtype
.need_anchor
then
325 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}: {unsafe_type}`.")
327 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}`.")
332 assert mproperty
isa MMethod
334 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
335 error
(node
, "Error: `{name}` is not a top-level method, thus need a receiver.")
337 if not recv_is_self
and mproperty
.is_toplevel
then
338 error
(node
, "Error: cannot call `{name}`, a top-level method, with a receiver.")
341 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
342 self.modelbuilder
.error
(node
, "Error: method `{name}` is protected and can only accessed by `self`.")
346 var info
= mproperty
.deprecation
347 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
350 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated: {mdoc.content.first}")
352 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated.")
356 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
358 if propdefs
.length
== 0 then
359 self.modelbuilder
.error
(node
, "Type Error: no definition found for property `{name}` in `{unsafe_type}`.")
361 else if propdefs
.length
== 1 then
362 mpropdef
= propdefs
.first
364 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property `{name}` in `{unsafe_type}`: {propdefs.join(" ")}")
365 mpropdef
= mproperty
.intro
369 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
370 if msignature
== null then return null # skip error
371 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
373 var erasure_cast
= false
374 var rettype
= mpropdef
.msignature
.return_mtype
375 if not recv_is_self
and rettype
!= null then
376 rettype
= rettype
.undecorate
377 if rettype
isa MParameterType then
378 var erased_rettype
= msignature
.return_mtype
379 assert erased_rettype
!= null
380 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
385 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
389 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
391 var unsafe_type
= self.anchor_to
(recvtype
)
392 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
393 if mproperty
== null then return null
394 return get_method
(node
, recvtype
, name
, recv_is_self
)
398 # Visit the expressions of args and check their conformity with the corresponding type in signature
399 # The point of this method is to handle varargs correctly
400 # Note: The signature must be correctly adapted
401 fun check_signature
(node
: ANode, args
: Array[AExpr], mproperty
: MProperty, msignature
: MSignature): nullable SignatureMap
403 var vararg_rank
= msignature
.vararg_rank
404 if vararg_rank
>= 0 then
405 if args
.length
< msignature
.arity
then
406 modelbuilder
.error
(node
, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
409 else if args
.length
!= msignature
.arity
then
410 if msignature
.arity
== msignature
.min_arity
then
411 modelbuilder
.error
(node
, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
414 if args
.length
> msignature
.arity
then
415 modelbuilder
.error
(node
, "Error: expected at most {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
418 if args
.length
< msignature
.min_arity
then
419 modelbuilder
.error
(node
, "Error: expected at least {msignature.min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
424 #debug("CALL {unsafe_type}.{msignature}")
426 # Associate each parameter to a position in the arguments
427 var map
= new SignatureMap
429 var setted
= args
.length
- msignature
.min_arity
430 var vararg_decl
= args
.length
- msignature
.arity
432 for i
in [0..msignature
.arity
[ do
433 var param
= msignature
.mparameters
[i
]
434 if param
.is_default
then
445 if i
== vararg_rank
then
447 continue # skip the vararg
450 var paramtype
= param
.mtype
451 self.visit_expr_subtype
(arg
, paramtype
)
453 if vararg_rank
>= 0 then
454 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
455 var first
= args
[vararg_rank
]
456 if vararg_decl
== 0 then
457 var mclass
= get_mclass
(node
, "Array")
458 if mclass
== null then return null # Forward error
459 var array_mtype
= mclass
.get_mtype
([paramtype
])
460 if first
isa AVarargExpr then
461 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
462 first
.mtype
= first
.n_expr
.mtype
464 # only one vararg, maybe `...` was forgot, so be gentle!
465 var t
= visit_expr
(first
)
466 if t
== null then return null # Forward error
467 if not is_subtype
(t
, paramtype
) and is_subtype
(t
, array_mtype
) then
468 # Not acceptable but could be a `...`
469 error
(first
, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
472 # Standard valid vararg, finish the job
474 self.visit_expr_subtype
(first
, paramtype
)
477 map
.vararg_decl
= vararg_decl
+ 1
478 for i
in [vararg_rank
..vararg_rank
+vararg_decl
] do
479 self.visit_expr_subtype
(args
[i
], paramtype
)
487 fun error
(node
: ANode, message
: String)
489 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
492 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
494 if not variable
.is_adapted
then return variable
.declared_type
496 var flow
= node
.after_flow_context
497 if flow
== null then return null # skip error
499 if flow
.vars
.has_key
(variable
) then
500 return flow
.vars
[variable
]
502 #node.debug("*** START Collected for {variable}")
503 var mtypes
= flow
.collect_types
(variable
)
504 #node.debug("**** END Collected for {variable}")
505 if mtypes
.length
== 0 then
506 return variable
.declared_type
507 else if mtypes
.length
== 1 then
510 var res
= merge_types
(node
,mtypes
)
511 if res
== null then res
= variable
.declared_type
517 # Some variables where type-adapted during the visit
520 # Some loops had been visited during the visit
523 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
525 var flow
= node
.after_flow_context
528 flow
.set_var
(self, variable
, mtype
)
531 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
533 if col
.length
== 1 then return col
.first
535 if t1
== null then continue # return null
538 if t2
== null then continue # return null
539 if can_be_null
(t2
) and not can_be_null
(t1
) then
542 if not is_subtype
(t2
, t1
) then found
= false
545 #print "merge {col.join(" ")} -> {t1}"
549 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
554 # Mapping between parameters and arguments in a call.
556 # Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
558 # The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
560 # Associate a parameter to an argument
561 var map
= new ArrayMap[Int, Int]
563 # The length of the vararg sequence
564 # 0 if no vararg or if reverse vararg (cf `AVarargExpr`)
565 var vararg_decl
: Int = 0
568 # A specific method call site with its associated informations.
570 # The associated node for location
573 # The static type of the receiver (possibly unresolved)
576 # The module where the callsite is present
579 # The anchor to use with `recv` or `msignature`
580 var anchor
: nullable MClassType
582 # Is the receiver self?
583 # If "for_self", virtual types of the signature are kept
584 # If "not_for_self", virtual type are erased
585 var recv_is_self
: Bool
587 # The designated method
588 var mproperty
: MMethod
590 # The statically designated method definition
591 # The most specif one, it is.
592 var mpropdef
: MMethodDef
594 # The resolved signature for the receiver
595 var msignature
: MSignature
597 # Is a implicit cast required on erasure typing policy?
598 var erasure_cast
: Bool
600 # The mapping used on the call to associate arguments to parameters
601 # If null then no specific association is required.
602 var signaturemap
: nullable SignatureMap = null
604 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
606 var map
= v
.check_signature
(self.node
, args
, self.mproperty
, self.msignature
)
613 # The declared type of the variable
614 var declared_type
: nullable MType
616 # Was the variable type-adapted?
617 # This is used to speedup type retrieval while it remains `false`
618 private var is_adapted
= false
621 redef class FlowContext
622 # Store changes of types because of type evolution
623 private var vars
= new HashMap[Variable, nullable MType]
625 # Adapt the variable to a static type
626 # Warning1: do not modify vars directly.
627 # Warning2: sub-flow may have cached a unadapted variable
628 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
630 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
631 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
632 self.vars
[variable
] = mtype
634 variable
.is_adapted
= true
635 #node.debug "set {variable} to {mtype or else "X"}"
638 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
639 private fun collect_types
(variable
: Variable): Array[nullable MType]
641 #node.debug "flow for {variable}"
642 var res
= new Array[nullable MType]
645 var seen
= new HashSet[FlowContext]
646 while not todo
.is_empty
do
648 if f
.is_unreachable
then continue
649 if seen
.has
(f
) then continue
652 if f
.vars
.has_key
(variable
) then
653 # Found something. Collect it and do not process further on this path
654 res
.add f
.vars
[variable
]
655 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
657 todo
.add_all f
.previous
659 if f
.previous
.is_empty
then
660 # Root flowcontext mean a parameter or something related
661 res
.add variable
.declared_type
662 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
666 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
672 # The entry point of the whole typing analysis
673 fun do_typing
(modelbuilder
: ModelBuilder)
677 # The variable associated to the receiver (if any)
678 var selfvariable
: nullable Variable
681 redef class AMethPropdef
682 redef fun do_typing
(modelbuilder
: ModelBuilder)
684 var nblock
= self.n_block
685 if nblock
== null then return
687 var mpropdef
= self.mpropdef
688 if mpropdef
== null then return # skip error
690 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
691 self.selfvariable
= v
.selfvariable
693 var mmethoddef
= self.mpropdef
.as(not null)
694 var msignature
= mmethoddef
.msignature
695 if msignature
== null then return # skip error
696 for i
in [0..msignature
.arity
[ do
697 var mtype
= msignature
.mparameters
[i
].mtype
698 if msignature
.vararg_rank
== i
then
699 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
700 if arrayclass
== null then return # Skip error
701 mtype
= arrayclass
.get_mtype
([mtype
])
703 var variable
= self.n_signature
.n_params
[i
].variable
704 assert variable
!= null
705 variable
.declared_type
= mtype
711 if not v
.has_loop
or not v
.dirty
then break
714 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
715 # We reach the end of the function without having a return, it is bad
716 v
.error
(self, "Error: reached end of function; expected `return` with a value.")
721 redef class AAttrPropdef
722 redef fun do_typing
(modelbuilder
: ModelBuilder)
724 if not has_value
then return
726 var mpropdef
= self.mpropdef
727 if mpropdef
== null then return # skip error
729 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
730 self.selfvariable
= v
.selfvariable
732 var nexpr
= self.n_expr
733 if nexpr
!= null then
734 var mtype
= self.mpropdef
.static_mtype
735 v
.visit_expr_subtype
(nexpr
, mtype
)
737 var nblock
= self.n_block
738 if nblock
!= null then
740 if not nblock
.after_flow_context
.is_unreachable
then
741 # We reach the end of the init without having a return, it is bad
742 v
.error
(self, "Error: reached end of block; expected `return`.")
751 # The static type of the expression.
752 # null if self is a statement or in case of error
753 var mtype
: nullable MType = null
755 # Is the statement correctly typed?
756 # Used to distinguish errors and statements when `mtype == null`
757 var is_typed
: Bool = false
759 # If required, the following implicit cast `.as(XXX)`
760 # Such a cast may by required after evaluating the expression when
761 # a unsafe operation is detected (silently accepted by the Nit language).
762 # The attribute is computed by `check_subtype`
763 var implicit_cast_to
: nullable MType = null
765 # Return the variable read (if any)
766 # Used to perform adaptive typing
767 fun its_variable
: nullable Variable do return null
769 private fun accept_typing
(v
: TypeVisitor)
771 v
.error
(self, "no implemented accept_typing for {self.class_name}")
774 # Is non-null if `self` is a leaf of a comprehension array construction.
775 # In this case, the enclosing literal array node is designated.
776 # The result of the evaluation of `self` must be
777 # stored inside the designated array (there is an implicit `push`)
778 var comprehension
: nullable AArrayExpr = null
781 redef class ABlockExpr
782 redef fun accept_typing
(v
)
784 for e
in self.n_expr
do v
.visit_stmt
(e
)
788 # The type of a blockexpr is the one of the last expression (or null if empty)
791 if self.n_expr
.is_empty
then return null
792 return self.n_expr
.last
.mtype
796 redef class AVardeclExpr
797 redef fun accept_typing
(v
)
799 var variable
= self.variable
800 if variable
== null then return # Skip error
802 var ntype
= self.n_type
803 var mtype
: nullable MType
804 if ntype
== null then
807 mtype
= v
.resolve_mtype
(ntype
)
808 if mtype
== null then return # Skip error
811 var nexpr
= self.n_expr
812 if nexpr
!= null then
813 if mtype
!= null then
814 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
815 if etype
== mtype
then
817 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
820 mtype
= v
.visit_expr
(nexpr
)
821 if mtype
== null then return # Skip error
826 if mtype
== null or mtype
isa MNullType then
827 var objclass
= v
.get_mclass
(self, "Object")
828 if objclass
== null then return # skip error
829 decltype
= objclass
.mclass_type
.as_nullable
830 if mtype
== null then mtype
= decltype
833 variable
.declared_type
= decltype
834 v
.set_variable
(self, variable
, mtype
)
836 #debug("var {variable}: {mtype}")
844 redef fun its_variable
do return self.variable
845 redef fun accept_typing
(v
)
847 var variable
= self.variable
848 if variable
== null then return # Skip error
850 var mtype
= v
.get_variable
(self, variable
)
851 if mtype
!= null then
852 #debug("{variable} is {mtype}")
854 #debug("{variable} is untyped")
861 redef class AVarAssignExpr
862 redef fun accept_typing
(v
)
864 var variable
= self.variable
865 assert variable
!= null
867 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
869 v
.set_variable
(self, variable
, mtype
)
875 redef class AReassignFormExpr
876 # The method designed by the reassign operator.
877 var reassign_callsite
: nullable CallSite
879 var read_type
: nullable MType = null
881 # Determine the `reassign_property`
882 # `readtype` is the type of the reading of the left value.
883 # `writetype` is the type of the writing of the left value.
884 # (Because of `ACallReassignExpr`, both can be different.
885 # Return the static type of the value to store.
886 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
888 var reassign_name
= self.n_assign_op
.operator
890 self.read_type
= readtype
892 var callsite
= v
.get_method
(self.n_assign_op
, readtype
, reassign_name
, false)
893 if callsite
== null then return null # Skip error
894 self.reassign_callsite
= callsite
896 var msignature
= callsite
.msignature
897 var rettype
= msignature
.return_mtype
898 assert msignature
.arity
== 1 and rettype
!= null
900 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
901 if value_type
== null then return null # Skip error
903 v
.check_subtype
(self, rettype
, writetype
, false)
908 redef class AVarReassignExpr
909 redef fun accept_typing
(v
)
911 var variable
= self.variable
912 assert variable
!= null
914 var readtype
= v
.get_variable
(self, variable
)
915 if readtype
== null then return
919 var writetype
= variable
.declared_type
920 if writetype
== null then return
922 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
924 v
.set_variable
(self, variable
, rettype
)
931 redef class AContinueExpr
932 redef fun accept_typing
(v
)
934 var nexpr
= self.n_expr
935 if nexpr
!= null then
942 redef class ABreakExpr
943 redef fun accept_typing
(v
)
945 var nexpr
= self.n_expr
946 if nexpr
!= null then
953 redef class AReturnExpr
954 redef fun accept_typing
(v
)
956 var nexpr
= self.n_expr
958 var mpropdef
= v
.mpropdef
959 if mpropdef
isa MMethodDef then
960 ret_type
= mpropdef
.msignature
.return_mtype
961 else if mpropdef
isa MAttributeDef then
962 ret_type
= mpropdef
.static_mtype
966 if nexpr
!= null then
967 if ret_type
!= null then
968 v
.visit_expr_subtype
(nexpr
, ret_type
)
971 v
.error
(nexpr
, "Error: `return` with value in a procedure.")
973 else if ret_type
!= null then
974 v
.error
(self, "Error: `return` without value in a function.")
980 redef class AAbortExpr
981 redef fun accept_typing
(v
)
988 redef fun accept_typing
(v
)
990 v
.visit_expr_bool
(n_expr
)
997 if n_then
!= null and n_else
== null then
998 self.mtype
= n_then
.mtype
1003 redef class AIfexprExpr
1004 redef fun accept_typing
(v
)
1006 v
.visit_expr_bool
(n_expr
)
1008 var t1
= v
.visit_expr
(n_then
)
1009 var t2
= v
.visit_expr
(n_else
)
1011 if t1
== null or t2
== null then
1015 var t
= v
.merge_types
(self, [t1
, t2
])
1017 v
.error
(self, "Type Error: ambiguous type `{t1}` vs `{t2}`.")
1024 redef fun accept_typing
(v
)
1026 v
.visit_stmt
(n_block
)
1027 self.is_typed
= true
1031 redef class AWhileExpr
1032 redef fun accept_typing
(v
)
1035 v
.visit_expr_bool
(n_expr
)
1036 v
.visit_stmt
(n_block
)
1037 self.is_typed
= true
1041 redef class ALoopExpr
1042 redef fun accept_typing
(v
)
1045 v
.visit_stmt
(n_block
)
1046 self.is_typed
= true
1050 redef class AForExpr
1051 var coltype
: nullable MClassType
1053 var method_iterator
: nullable CallSite
1054 var method_is_ok
: nullable CallSite
1055 var method_item
: nullable CallSite
1056 var method_next
: nullable CallSite
1057 var method_key
: nullable CallSite
1058 var method_finish
: nullable CallSite
1060 var method_lt
: nullable CallSite
1061 var method_successor
: nullable CallSite
1063 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1065 if mtype
isa MNullType then
1066 v
.error
(self, "Type Error: `for` cannot iterate over `null`.")
1071 var objcla
= v
.get_mclass
(self, "Object")
1072 if objcla
== null then return
1074 # check iterator method
1075 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1076 if itdef
== null then
1077 v
.error
(self, "Type Error: `for` expects a type providing an `iterator` method, got `{mtype}`.")
1080 self.method_iterator
= itdef
1082 # check that iterator return something
1083 var ittype
= itdef
.msignature
.return_mtype
1084 if ittype
== null then
1085 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1090 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1091 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1095 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1097 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1098 var variables
= self.variables
1099 if variables
.length
!= 1 then
1100 v
.error
(self, "Type Error: `for` expects only one variable when using `Iterator`.")
1102 variables
.first
.declared_type
= coltype
.arguments
.first
1107 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1109 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1110 var variables
= self.variables
1111 if variables
.length
!= 2 then
1112 v
.error
(self, "Type Error: `for` expects two variables when using `MapIterator`.")
1114 variables
[0].declared_type
= coltype
.arguments
[0]
1115 variables
[1].declared_type
= coltype
.arguments
[1]
1120 if not is_col
and not is_map
then
1121 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1125 # anchor formal and virtual types
1126 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1128 mtype
= mtype
.undecorate
1129 self.coltype
= mtype
.as(MClassType)
1131 # get methods is_ok, next, item
1132 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1133 if ikdef
== null then
1134 v
.error
(self, "Type Error: `for` expects a method `is_ok` in type `{ittype}`.")
1137 self.method_is_ok
= ikdef
1139 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1140 if itemdef
== null then
1141 v
.error
(self, "Type Error: `for` expects a method `item` in type `{ittype}`.")
1144 self.method_item
= itemdef
1146 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1147 if nextdef
== null then
1148 v
.error
(self, "Type Error: `for` expects a method `next` in type {ittype}.")
1151 self.method_next
= nextdef
1153 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1156 var keydef
= v
.get_method
(self, ittype
, "key", false)
1157 if keydef
== null then
1158 v
.error
(self, "Type Error: `for` expects a method `key` in type `{ittype}`.")
1161 self.method_key
= keydef
1164 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1165 var variable
= variables
.first
1166 var vtype
= variable
.declared_type
.as(not null)
1168 if n_expr
isa AOrangeExpr then
1169 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1171 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1174 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1178 redef fun accept_typing
(v
)
1181 var mtype
= v
.visit_expr
(n_expr
)
1182 if mtype
== null then return
1184 self.do_type_iterator
(v
, mtype
)
1186 v
.visit_stmt
(n_block
)
1188 self.mtype
= n_block
.mtype
1189 self.is_typed
= true
1193 redef class AWithExpr
1194 var method_start
: nullable CallSite
1195 var method_finish
: nullable CallSite
1197 redef fun accept_typing
(v
: TypeVisitor)
1199 var mtype
= v
.visit_expr
(n_expr
)
1200 if mtype
== null then return
1202 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1203 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1205 v
.visit_stmt
(n_block
)
1206 self.mtype
= n_block
.mtype
1207 self.is_typed
= true
1211 redef class AAssertExpr
1212 redef fun accept_typing
(v
)
1214 v
.visit_expr_bool
(n_expr
)
1216 v
.visit_stmt
(n_else
)
1217 self.is_typed
= true
1222 redef fun accept_typing
(v
)
1224 v
.visit_expr_bool
(n_expr
)
1225 v
.visit_expr_bool
(n_expr2
)
1226 self.mtype
= v
.type_bool
(self)
1230 redef class AImpliesExpr
1231 redef fun accept_typing
(v
)
1233 v
.visit_expr_bool
(n_expr
)
1234 v
.visit_expr_bool
(n_expr2
)
1235 self.mtype
= v
.type_bool
(self)
1239 redef class AAndExpr
1240 redef fun accept_typing
(v
)
1242 v
.visit_expr_bool
(n_expr
)
1243 v
.visit_expr_bool
(n_expr2
)
1244 self.mtype
= v
.type_bool
(self)
1249 redef class ANotExpr
1250 redef fun accept_typing
(v
)
1252 v
.visit_expr_bool
(n_expr
)
1253 self.mtype
= v
.type_bool
(self)
1257 redef class AOrElseExpr
1258 redef fun accept_typing
(v
)
1260 var t1
= v
.visit_expr
(n_expr
)
1261 var t2
= v
.visit_expr
(n_expr2
)
1263 if t1
== null or t2
== null then
1267 if t1
isa MNullType then
1268 v
.error
(n_expr
, "Type Error: `or else` on `null`.")
1269 else if v
.check_can_be_null
(n_expr
, t1
) then
1273 var t
= v
.merge_types
(self, [t1
, t2
])
1275 var c
= v
.get_mclass
(self, "Object")
1276 if c
== null then return # forward error
1278 if v
.can_be_null
(t2
) then
1281 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1287 redef class ATrueExpr
1288 redef fun accept_typing
(v
)
1290 self.mtype
= v
.type_bool
(self)
1294 redef class AFalseExpr
1295 redef fun accept_typing
(v
)
1297 self.mtype
= v
.type_bool
(self)
1301 redef class AIntExpr
1302 redef fun accept_typing
(v
)
1304 var mclass
= v
.get_mclass
(self, "Int")
1305 if mclass
== null then return # Forward error
1306 self.mtype
= mclass
.mclass_type
1310 redef class AFloatExpr
1311 redef fun accept_typing
(v
)
1313 var mclass
= v
.get_mclass
(self, "Float")
1314 if mclass
== null then return # Forward error
1315 self.mtype
= mclass
.mclass_type
1319 redef class ACharExpr
1320 redef fun accept_typing
(v
)
1322 var mclass
= v
.get_mclass
(self, "Char")
1323 if mclass
== null then return # Forward error
1324 self.mtype
= mclass
.mclass_type
1328 redef class AStringFormExpr
1329 redef fun accept_typing
(v
)
1331 var mclass
= v
.get_mclass
(self, "String")
1332 if mclass
== null then return # Forward error
1333 self.mtype
= mclass
.mclass_type
1337 redef class ASuperstringExpr
1338 redef fun accept_typing
(v
)
1340 var mclass
= v
.get_mclass
(self, "String")
1341 if mclass
== null then return # Forward error
1342 self.mtype
= mclass
.mclass_type
1343 var objclass
= v
.get_mclass
(self, "Object")
1344 if objclass
== null then return # Forward error
1345 var objtype
= objclass
.mclass_type
1346 for nexpr
in self.n_exprs
do
1347 v
.visit_expr_subtype
(nexpr
, objtype
)
1352 redef class AArrayExpr
1353 # The `with_capacity` method on Array
1354 var with_capacity_callsite
: nullable CallSite
1356 # The `push` method on arrays
1357 var push_callsite
: nullable CallSite
1359 # The element of each type
1360 var element_mtype
: nullable MType
1362 # Set that `self` is a part of comprehension array `na`
1363 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1364 private fun set_comprehension
(n
: nullable AExpr)
1368 else if n
isa AForExpr then
1369 set_comprehension
(n
.n_block
)
1370 else if n
isa AIfExpr then
1371 set_comprehension
(n
.n_then
)
1372 set_comprehension
(n
.n_else
)
1375 n
.comprehension
= self
1378 redef fun accept_typing
(v
)
1380 var mtype
: nullable MType = null
1381 var ntype
= self.n_type
1382 if ntype
!= null then
1383 mtype
= v
.resolve_mtype
(ntype
)
1384 if mtype
== null then return # Skip error
1386 var mtypes
= new Array[nullable MType]
1388 for e
in self.n_exprs
do
1389 var t
= v
.visit_expr
(e
)
1393 set_comprehension
(e
)
1394 if mtype
!= null then
1395 if v
.check_subtype
(e
, t
, mtype
, false) == null then return # Forward error
1396 if t
== mtype
then useless
= true
1401 if mtype
== null then
1402 # Ensure monotony for type adaptation on loops
1403 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1404 mtype
= v
.merge_types
(self, mtypes
)
1406 if mtype
== null or mtype
isa MNullType then
1407 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1411 assert ntype
!= null
1412 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1415 self.element_mtype
= mtype
1417 var mclass
= v
.get_mclass
(self, "Array")
1418 if mclass
== null then return # Forward error
1419 var array_mtype
= mclass
.get_mtype
([mtype
])
1421 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1422 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1424 self.mtype
= array_mtype
1428 redef class ARangeExpr
1429 var init_callsite
: nullable CallSite
1431 redef fun accept_typing
(v
)
1433 var discrete_class
= v
.get_mclass
(self, "Discrete")
1434 if discrete_class
== null then return # Forward error
1435 var discrete_type
= discrete_class
.intro
.bound_mtype
1436 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1437 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1438 if t1
== null or t2
== null then return
1439 var mclass
= v
.get_mclass
(self, "Range")
1440 if mclass
== null then return # Forward error
1442 if v
.is_subtype
(t1
, t2
) then
1443 mtype
= mclass
.get_mtype
([t2
])
1444 else if v
.is_subtype
(t2
, t1
) then
1445 mtype
= mclass
.get_mtype
([t1
])
1447 v
.error
(self, "Type Error: cannot create range: `{t1}` vs `{t2}`.")
1453 # get the constructor
1455 if self isa ACrangeExpr then
1456 callsite
= v
.get_method
(self, mtype
, "init", false)
1457 else if self isa AOrangeExpr then
1458 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1462 init_callsite
= callsite
1466 redef class ANullExpr
1467 redef fun accept_typing
(v
)
1469 self.mtype
= v
.mmodule
.model
.null_type
1473 redef class AIsaExpr
1474 # The static type to cast to.
1475 # (different from the static type of the expression that is `Bool`).
1476 var cast_type
: nullable MType
1477 redef fun accept_typing
(v
)
1479 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1480 self.cast_type
= mtype
1482 var variable
= self.n_expr
.its_variable
1483 if variable
!= null then
1484 #var orig = self.n_expr.mtype
1485 #var from = if orig != null then orig.to_s else "invalid"
1486 #var to = if mtype != null then mtype.to_s else "invalid"
1487 #debug("adapt {variable}: {from} -> {to}")
1488 self.after_flow_context
.when_true
.set_var
(v
, variable
, mtype
)
1491 self.mtype
= v
.type_bool
(self)
1495 redef class AAsCastExpr
1496 redef fun accept_typing
(v
)
1498 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1502 redef class AAsNotnullExpr
1503 redef fun accept_typing
(v
)
1505 var mtype
= v
.visit_expr
(self.n_expr
)
1506 if mtype
== null then return # Forward error
1508 if mtype
isa MNullType then
1509 v
.error
(self, "Type Error: `as(not null)` on `null`.")
1513 if v
.check_can_be_null
(n_expr
, mtype
) then
1514 mtype
= mtype
.as_notnull
1521 redef class AParExpr
1522 redef fun accept_typing
(v
)
1524 self.mtype
= v
.visit_expr
(self.n_expr
)
1528 redef class AOnceExpr
1529 redef fun accept_typing
(v
)
1531 self.mtype
= v
.visit_expr
(self.n_expr
)
1535 redef class ASelfExpr
1536 redef var its_variable
: nullable Variable
1537 redef fun accept_typing
(v
)
1539 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1540 v
.error
(self, "Error: `self` cannot be used in top-level method.")
1542 var variable
= v
.selfvariable
1543 self.its_variable
= variable
1544 self.mtype
= v
.get_variable
(self, variable
)
1548 redef class AImplicitSelfExpr
1549 # Is the implicit receiver `sys`?
1551 # By default, the implicit receiver is `self`.
1552 # But when there is not method for `self`, `sys` is used as a fall-back.
1553 # Is this case this flag is set to `true`.
1557 ## MESSAGE SENDING AND PROPERTY
1559 redef class ASendExpr
1560 # The property invoked by the send.
1561 var callsite
: nullable CallSite
1563 redef fun accept_typing
(v
)
1565 var nrecv
= self.n_expr
1566 var recvtype
= v
.visit_expr
(nrecv
)
1567 var name
= self.property_name
1568 var node
= self.property_node
1570 if recvtype
== null then return # Forward error
1573 var unsafe_type
= v
.anchor_to
(recvtype
)
1574 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1575 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1576 # Special fall-back search in `sys` when noting found in the implicit receiver.
1577 var sysclass
= v
.try_get_mclass
(node
, "Sys")
1578 if sysclass
!= null then
1579 var systype
= sysclass
.mclass_type
1580 mproperty
= v
.try_get_mproperty_by_name2
(node
, systype
, name
)
1581 if mproperty
!= null then
1582 callsite
= v
.get_method
(node
, systype
, name
, false)
1583 if callsite
== null then return # Forward error
1584 # Update information, we are looking at `sys` now, not `self`
1586 nrecv
.its_variable
= null
1587 nrecv
.mtype
= systype
1592 if callsite
== null then
1593 # If still nothing, just exit
1594 callsite
= v
.get_method
(node
, recvtype
, name
, nrecv
isa ASelfExpr)
1595 if callsite
== null then return
1598 self.callsite
= callsite
1599 var msignature
= callsite
.msignature
1601 var args
= compute_raw_arguments
1603 callsite
.check_signature
(v
, args
)
1605 if callsite
.mproperty
.is_init
then
1606 var vmpropdef
= v
.mpropdef
1607 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1608 v
.error
(node
, "Error: an `init` can only be called from another `init`.")
1610 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1611 v
.error
(node
, "Error: `{vmpropdef}` cannot call a factory `{callsite.mproperty}`.")
1615 var ret
= msignature
.return_mtype
1619 self.is_typed
= true
1623 # The name of the property
1624 # Each subclass simply provide the correct name.
1625 private fun property_name
: String is abstract
1627 # The node identifying the name (id, operator, etc) for messages.
1629 # Is `self` by default
1630 private fun property_node
: ANode do return self
1632 # An array of all arguments (excluding self)
1633 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1635 private fun compute_raw_arguments
: Array[AExpr] is abstract
1638 redef class ABinopExpr
1639 redef fun compute_raw_arguments
do return [n_expr2
]
1640 redef fun property_name
do return operator
1641 redef fun property_node
do return n_op
1644 redef fun accept_typing
(v
)
1651 redef fun accept_typing
(v
)
1658 redef class AUplusExpr
1659 redef fun property_name
do return "unary +"
1660 redef fun compute_raw_arguments
do return new Array[AExpr]
1663 redef class AUminusExpr
1664 redef fun property_name
do return "unary -"
1665 redef fun compute_raw_arguments
do return new Array[AExpr]
1669 redef class ACallExpr
1670 redef fun property_name
do return n_id
.text
1671 redef fun property_node
do return n_id
1672 redef fun compute_raw_arguments
do return n_args
.to_a
1675 redef class ACallAssignExpr
1676 redef fun property_name
do return n_id
.text
+ "="
1677 redef fun property_node
do return n_id
1678 redef fun compute_raw_arguments
1680 var res
= n_args
.to_a
1686 redef class ABraExpr
1687 redef fun property_name
do return "[]"
1688 redef fun compute_raw_arguments
do return n_args
.to_a
1691 redef class ABraAssignExpr
1692 redef fun property_name
do return "[]="
1693 redef fun compute_raw_arguments
1695 var res
= n_args
.to_a
1701 redef class ASendReassignFormExpr
1702 # The property invoked for the writing
1703 var write_callsite
: nullable CallSite
1705 redef fun accept_typing
(v
)
1707 var recvtype
= v
.visit_expr
(self.n_expr
)
1708 var name
= self.property_name
1709 var node
= self.property_node
1711 if recvtype
== null then return # Forward error
1713 var for_self
= self.n_expr
isa ASelfExpr
1714 var callsite
= v
.get_method
(node
, recvtype
, name
, for_self
)
1716 if callsite
== null then return
1717 self.callsite
= callsite
1719 var args
= compute_raw_arguments
1721 callsite
.check_signature
(v
, args
)
1723 var readtype
= callsite
.msignature
.return_mtype
1724 if readtype
== null then
1725 v
.error
(node
, "Error: `{name}` is not a function.")
1729 var wcallsite
= v
.get_method
(node
, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1730 if wcallsite
== null then return
1731 self.write_callsite
= wcallsite
1733 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1734 if wtype
== null then return
1736 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1737 args
.add
(self.n_value
)
1738 wcallsite
.check_signature
(v
, args
)
1740 self.is_typed
= true
1744 redef class ACallReassignExpr
1745 redef fun property_name
do return n_id
.text
1746 redef fun property_node
do return n_id
1747 redef fun compute_raw_arguments
do return n_args
.to_a
1750 redef class ABraReassignExpr
1751 redef fun property_name
do return "[]"
1752 redef fun compute_raw_arguments
do return n_args
.to_a
1755 redef class AInitExpr
1756 redef fun property_name
do return "init"
1757 redef fun property_node
do return n_kwinit
1758 redef fun compute_raw_arguments
do return n_args
.to_a
1762 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1767 redef class ASuperExpr
1768 # The method to call if the super is in fact a 'super init call'
1769 # Note: if the super is a normal call-next-method, then this attribute is null
1770 var callsite
: nullable CallSite
1772 # The method to call is the super is a standard `call-next-method` super-call
1773 # Note: if the super is a special super-init-call, then this attribute is null
1774 var mpropdef
: nullable MMethodDef
1776 redef fun accept_typing
(v
)
1778 var anchor
= v
.anchor
1779 assert anchor
!= null
1780 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1781 assert recvtype
!= null
1782 var mproperty
= v
.mpropdef
.mproperty
1783 if not mproperty
isa MMethod then
1784 v
.error
(self, "Error: `super` only usable in a `method`.")
1787 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1788 if superprops
.length
== 0 then
1789 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1790 process_superinit
(v
)
1793 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
1796 # FIXME: covariance of return type in linear extension?
1797 var superprop
= superprops
.first
1799 var msignature
= superprop
.msignature
.as(not null)
1800 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1801 var args
= self.n_args
.to_a
1802 if args
.length
> 0 then
1803 signaturemap
= v
.check_signature
(self, args
, mproperty
, msignature
)
1805 self.mtype
= msignature
.return_mtype
1806 self.is_typed
= true
1807 v
.mpropdef
.has_supercall
= true
1808 mpropdef
= v
.mpropdef
.as(MMethodDef)
1811 # The mapping used on the call to associate arguments to parameters.
1812 # If null then no specific association is required.
1813 var signaturemap
: nullable SignatureMap
1815 private fun process_superinit
(v
: TypeVisitor)
1817 var anchor
= v
.anchor
1818 assert anchor
!= null
1819 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1820 assert recvtype
!= null
1821 var mpropdef
= v
.mpropdef
1822 assert mpropdef
isa MMethodDef
1823 var mproperty
= mpropdef
.mproperty
1824 var superprop
: nullable MMethodDef = null
1825 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1826 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1827 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1828 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1829 if candidate
== null then
1830 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1831 continue # Try next super-class
1833 if superprop
!= null and candidate
.is_root_init
then
1836 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1837 v
.error
(self, "Error: conflicting super constructor to call for `{mproperty}`: `{candidate.full_name}`, `{superprop.mproperty.full_name}`")
1840 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1841 if superprop
!= null and superprop
.mproperty
== candidate
then
1842 if superprop
== candidatedefs
.first
then continue
1843 candidatedefs
.add
(superprop
)
1845 if candidatedefs
.length
> 1 then
1846 v
.error
(self, "Error: conflicting property definitions for property `{mproperty}` in `{recvtype}`: {candidatedefs.join(", ")}")
1849 superprop
= candidatedefs
.first
1851 if superprop
== null then
1852 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
1856 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1857 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1859 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1860 self.callsite
= callsite
1862 var args
= self.n_args
.to_a
1863 if args
.length
> 0 then
1864 callsite
.check_signature
(v
, args
)
1866 # Check there is at least enough parameters
1867 if mpropdef
.msignature
.arity
< msignature
.arity
then
1868 v
.error
(self, "Error: not enough implicit arguments to pass. Got `{mpropdef.msignature.arity}`, expected at least `{msignature.arity}`. Signature is `{msignature}`.")
1871 # Check that each needed parameter is conform
1873 for sp
in msignature
.mparameters
do
1874 var p
= mpropdef
.msignature
.mparameters
[i
]
1875 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1876 v
.error
(self, "Type Error: expected argument #{i} of type `{sp.mtype}`, got implicit argument `{p.name}` of type `{p.mtype}`. Signature is {msignature}")
1883 self.is_typed
= true
1889 redef class ANewExpr
1890 # The constructor invoked by the new.
1891 var callsite
: nullable CallSite
1893 # The designated type
1894 var recvtype
: nullable MClassType
1896 redef fun accept_typing
(v
)
1898 var recvtype
= v
.resolve_mtype
(self.n_type
)
1899 if recvtype
== null then return
1901 if not recvtype
isa MClassType then
1902 if recvtype
isa MNullableType then
1903 v
.error
(self, "Type Error: cannot instantiate the nullable type `{recvtype}`.")
1905 else if recvtype
isa MFormalType then
1906 v
.error
(self, "Type Error: cannot instantiate the formal type `{recvtype}`.")
1909 v
.error
(self, "Type Error: cannot instantiate the type `{recvtype}`.")
1914 self.recvtype
= recvtype
1915 var kind
= recvtype
.mclass
.kind
1927 if name
== "intern" then
1928 if kind
!= concrete_kind
then
1929 v
.error
(self, "Type Error: cannot instantiate {kind} {recvtype}.")
1932 if n_args
.n_exprs
.not_empty
then
1933 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
1937 self.mtype
= recvtype
1941 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
1942 if callsite
== null then return
1944 if not callsite
.mproperty
.is_new
then
1945 if kind
!= concrete_kind
then
1946 v
.error
(self, "Type Error: cannot instantiate {kind} `{recvtype}`.")
1949 self.mtype
= recvtype
1951 self.mtype
= callsite
.msignature
.return_mtype
1952 assert self.mtype
!= null
1955 self.callsite
= callsite
1957 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1958 v
.error
(self, "Error: `{name}` is not a constructor.")
1962 var args
= n_args
.to_a
1963 callsite
.check_signature
(v
, args
)
1969 redef class AAttrFormExpr
1970 # The attribute accessed.
1971 var mproperty
: nullable MAttribute
1973 # The static type of the attribute.
1974 var attr_type
: nullable MType
1976 # Resolve the attribute accessed.
1977 private fun resolve_property
(v
: TypeVisitor)
1979 var recvtype
= v
.visit_expr
(self.n_expr
)
1980 if recvtype
== null then return # Skip error
1981 var node
= self.n_id
1982 var name
= node
.text
1983 if recvtype
isa MNullType then
1984 v
.error
(node
, "Error: attribute `{name}` access on `null`.")
1988 var unsafe_type
= v
.anchor_to
(recvtype
)
1989 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1990 if mproperty
== null then
1991 v
.modelbuilder
.error
(node
, "Error: attribute `{name}` does not exist in `{recvtype}`.")
1994 assert mproperty
isa MAttribute
1995 self.mproperty
= mproperty
1997 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1998 assert mpropdefs
.length
== 1
1999 var mpropdef
= mpropdefs
.first
2000 var attr_type
= mpropdef
.static_mtype
2001 if attr_type
== null then return # skip error
2002 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
2003 self.attr_type
= attr_type
2007 redef class AAttrExpr
2008 redef fun accept_typing
(v
)
2010 self.resolve_property
(v
)
2011 self.mtype
= self.attr_type
2016 redef class AAttrAssignExpr
2017 redef fun accept_typing
(v
)
2019 self.resolve_property
(v
)
2020 var mtype
= self.attr_type
2022 v
.visit_expr_subtype
(self.n_value
, mtype
)
2023 self.is_typed
= true
2027 redef class AAttrReassignExpr
2028 redef fun accept_typing
(v
)
2030 self.resolve_property
(v
)
2031 var mtype
= self.attr_type
2032 if mtype
== null then return # Skip error
2034 self.resolve_reassignment
(v
, mtype
, mtype
)
2036 self.is_typed
= true
2040 redef class AIssetAttrExpr
2041 redef fun accept_typing
(v
)
2043 self.resolve_property
(v
)
2044 var mtype
= self.attr_type
2045 if mtype
== null then return # Skip error
2047 var recvtype
= self.n_expr
.mtype
.as(not null)
2048 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2049 if bound
isa MNullableType then
2050 v
.error
(n_id
, "Type Error: `isset` on a nullable attribute.")
2052 self.mtype
= v
.type_bool
(self)
2056 redef class AVarargExpr
2057 redef fun accept_typing
(v
)
2059 # This kind of pseudo-expression can be only processed trough a signature
2060 # See `check_signature`
2061 # Other cases are a syntax error.
2062 v
.error
(self, "Syntax Error: unexpected `...`.")
2068 redef class ADebugTypeExpr
2069 redef fun accept_typing
(v
)
2071 var expr
= v
.visit_expr
(self.n_expr
)
2072 if expr
== null then return
2073 var unsafe
= v
.anchor_to
(expr
)
2074 var ntype
= self.n_type
2075 var mtype
= v
.resolve_mtype
(ntype
)
2076 if mtype
!= null and mtype
!= expr
then
2077 var umtype
= v
.anchor_to
(mtype
)
2078 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2080 self.is_typed
= true