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.
25 redef class ToolContext
26 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
29 private class TypingPhase
31 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
34 private class TypeVisitor
35 var modelbuilder
: ModelBuilder
37 # The module of the analysis
38 # Used to correctly query the model
41 # The static type of the receiver
42 # Mainly used for type tests and type resolutions
43 var anchor
: nullable MClassType = null
45 # The analyzed mclassdef
46 var mclassdef
: nullable MClassDef = null
48 # The analyzed property
49 var mpropdef
: nullable MPropDef
51 var selfvariable
= new Variable("self")
53 # Is `self` use restricted?
54 # * no explicit `self`
55 # * method called on the implicit self must be top-level
56 # Currently only used for `new` factory since there is no valid receiver inside
57 var is_toplevel_context
= false
61 var mpropdef
= self.mpropdef
63 if mpropdef
!= null then
64 self.mpropdef
= mpropdef
65 var mclassdef
= mpropdef
.mclassdef
66 self.mclassdef
= mclassdef
67 self.anchor
= mclassdef
.bound_mtype
69 var mclass
= mclassdef
.mclass
71 var selfvariable
= new Variable("self")
72 self.selfvariable
= selfvariable
73 selfvariable
.declared_type
= mclass
.mclass_type
75 var mprop
= mpropdef
.mproperty
76 if mprop
isa MMethod and mprop
.is_new
then
77 is_toplevel_context
= true
82 fun anchor_to
(mtype
: MType): MType
85 if anchor
== null then
86 assert not mtype
.need_anchor
89 return mtype
.anchor_to
(mmodule
, anchor
)
92 fun is_subtype
(sub
, sup
: MType): Bool
94 return sub
.is_subtype
(mmodule
, anchor
, sup
)
97 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
99 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
100 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
104 # Check that `sub` is a subtype of `sup`.
105 # If `sub` is not a valid suptype, then display an error on `node` an return null.
106 # If `sub` is a safe subtype of `sup` then return `sub`.
107 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
109 # The point of the return type is to determinate the usable type on an expression when `autocast` is true:
110 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
111 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
112 fun check_subtype
(node
: ANode, sub
, sup
: MType, autocast
: Bool): nullable MType
114 if self.is_subtype
(sub
, sup
) then return sub
115 if autocast
and self.is_subtype
(sub
, self.anchor_to
(sup
)) then
116 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
117 #node.debug("Unsafe typing: expected {sup}, got {sub}")
120 if sup
isa MBottomType then return null # Skip error
121 if sub
.need_anchor
then
122 var u
= anchor_to
(sub
)
123 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}: {u}`.")
125 self.modelbuilder
.error
(node
, "Type Error: expected `{sup}`, got `{sub}`.")
130 # Visit an expression and do not care about the return value
131 fun visit_stmt
(nexpr
: nullable AExpr)
133 if nexpr
== null then return
134 nexpr
.accept_typing
(self)
137 # Visit an expression and expects that it is not a statement
138 # Return the type of the expression
139 # Display an error and return null if:
140 # * the type cannot be determined or
141 # * `nexpr` is a statement
142 fun visit_expr
(nexpr
: AExpr): nullable MType
144 nexpr
.accept_typing
(self)
145 var mtype
= nexpr
.mtype
146 if mtype
!= null then return mtype
147 if not nexpr
.is_typed
then
148 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
149 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
150 nexpr
.debug
("No return type but no error.")
153 return null # forward error
155 self.error
(nexpr
, "Error: expected an expression.")
159 # Visit an expression and expect its static type is a least a `sup`
160 # Return the type of the expression or null if
161 # * the type cannot be determined or
162 # * `nexpr` is a statement or
163 # * `nexpr` is not a `sup`
164 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
166 var sub
= visit_expr
(nexpr
)
167 if sub
== null then return null # Forward error
169 if sup
== null then return null # Forward error
171 var res
= check_subtype
(nexpr
, sub
, sup
, true)
173 nexpr
.implicit_cast_to
= res
178 # Visit an expression and expect its static type is a `Bool`
179 # Return the type of the expression or null if
180 # * the type cannot be determined or
181 # * `nexpr` is a statement or
182 # * `nexpr` is not a `Bool`
183 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
185 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
189 fun check_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
191 var sub
= nexpr
.mtype
192 if sub
== null then return null # Forward error
194 var sup
= ntype
.mtype
195 if sup
== null then return null # Forward error
198 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}`.")
199 else if self.is_subtype
(sub
, sup
) then
200 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: expression is already a `{sup}` since it is a `{sub}`.")
205 # Can `mtype` be null (up to the current knowledge)?
206 fun can_be_null
(mtype
: MType): Bool
208 if mtype
isa MNullableType or mtype
isa MNullType then return true
209 if mtype
isa MFormalType then
210 var x
= anchor_to
(mtype
)
211 if x
isa MNullableType or x
isa MNullType then return true
216 # Check that `mtype` can be null (up to the current knowledge).
218 # If not then display a `useless-null-test` warning on node and return false.
220 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
222 if mtype
isa MNullType then
223 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is always `null`.")
226 if can_be_null
(mtype
) then return true
228 if mtype
isa MFormalType then
229 var res
= anchor_to
(mtype
)
230 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
232 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
237 # Special verification on != and == for null
239 fun null_test
(anode
: ABinopExpr)
241 var mtype
= anode
.n_expr
.mtype
242 var mtype2
= anode
.n_expr2
.mtype
244 if mtype
== null or mtype2
== null then return
246 if not mtype2
isa MNullType then return
248 # Check of useless null
249 if not can_be_null
(mtype
) then return
251 if mtype
isa MNullType then
252 # Because of type adaptation, we cannot just stop here
253 # so return use `null` as a bottom type that will be merged easily (cf) `merge_types`
256 mtype
= mtype
.as_notnull
259 # Check for type adaptation
260 var variable
= anode
.n_expr
.its_variable
261 if variable
== null then return
263 # One is null (mtype2 see above) the other is not null
264 if anode
isa AEqExpr then
265 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype2
)
266 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype
)
267 else if anode
isa ANeExpr then
268 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype2
)
269 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype
)
275 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
277 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
280 fun resolve_mtype
(node
: AType): nullable MType
282 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
285 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
287 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
291 fun get_mclass
(node
: ANode, name
: String): nullable MClass
293 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
297 fun type_bool
(node
: ANode): nullable MType
299 var mclass
= self.get_mclass
(node
, "Bool")
300 if mclass
== null then return null
301 return mclass
.mclass_type
304 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
306 var unsafe_type
= self.anchor_to
(recvtype
)
308 #debug("recv: {recvtype} (aka {unsafe_type})")
309 if recvtype
isa MNullType then
310 var objclass
= get_mclass
(node
, "Object")
311 if objclass
== null then return null # Forward error
312 unsafe_type
= objclass
.mclass_type
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
)
319 if mproperty
== null then
321 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
325 if mproperty
== null then
327 self.modelbuilder
.error
(node
, "Error: method or variable `{name}` unknown in `{recvtype}`.")
328 else if recvtype
.need_anchor
then
329 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}: {unsafe_type}`.")
331 self.modelbuilder
.error
(node
, "Error: method `{name}` does not exists in `{recvtype}`.")
336 assert mproperty
isa MMethod
338 # `null` only accepts some methods of object.
339 if recvtype
isa MNullType and not mproperty
.is_null_safe
then
340 self.error
(node
, "Error: method `{name}` called on `null`.")
342 else if unsafe_type
isa MNullableType and not mproperty
.is_null_safe
then
343 modelbuilder
.advice
(node
, "call-on-nullable", "Warning: method call on a nullable receiver `{recvtype}`.")
346 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
347 error
(node
, "Error: `{name}` is not a top-level method, thus need a receiver.")
349 if not recv_is_self
and mproperty
.is_toplevel
then
350 error
(node
, "Error: cannot call `{name}`, a top-level method, with a receiver.")
353 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
354 self.modelbuilder
.error
(node
, "Error: method `{name}` is protected and can only accessed by `self`.")
358 var info
= mproperty
.deprecation
359 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
362 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated: {mdoc.content.first}")
364 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: method `{name}` is deprecated.")
368 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
370 if propdefs
.length
== 0 then
371 self.modelbuilder
.error
(node
, "Type Error: no definition found for property `{name}` in `{unsafe_type}`.")
373 else if propdefs
.length
== 1 then
374 mpropdef
= propdefs
.first
376 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property `{name}` in `{unsafe_type}`: {propdefs.join(" ")}")
377 mpropdef
= mproperty
.intro
381 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
382 if msignature
== null then return null # skip error
383 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
385 var erasure_cast
= false
386 var rettype
= mpropdef
.msignature
.return_mtype
387 if not recv_is_self
and rettype
!= null then
388 rettype
= rettype
.undecorate
389 if rettype
isa MParameterType then
390 var erased_rettype
= msignature
.return_mtype
391 assert erased_rettype
!= null
392 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
397 var callsite
= new CallSite(node
.hot_location
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
401 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
403 var unsafe_type
= self.anchor_to
(recvtype
)
404 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
405 if mproperty
== null then return null
406 return get_method
(node
, recvtype
, name
, recv_is_self
)
410 # Visit the expressions of args and check their conformity with the corresponding type in signature
411 # The point of this method is to handle varargs correctly
412 # Note: The signature must be correctly adapted
413 fun check_signature
(node
: ANode, args
: Array[AExpr], mproperty
: MProperty, msignature
: MSignature): nullable SignatureMap
415 var vararg_rank
= msignature
.vararg_rank
416 if vararg_rank
>= 0 then
417 if args
.length
< msignature
.arity
then
418 modelbuilder
.error
(node
, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
421 else if args
.length
!= msignature
.arity
then
423 if args
.length
> msignature
.arity
then
424 modelbuilder
.error
(node
, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
427 # Other cases are managed later
431 #debug("CALL {unsafe_type}.{msignature}")
433 # Associate each parameter to a position in the arguments
434 var map
= new SignatureMap
436 # Special case for the isolated last argument
437 # TODO: reify this method characteristics (where? the param, the signature, the method?)
438 var last_is_padded
= mproperty
.name
.chars
.last
== '='
439 var nbargs
= args
.length
440 if last_is_padded
then
442 assert not args
.last
isa ANamedargExpr
443 map
.map
[msignature
.arity
- 1] = args
.length
- 1
444 self.visit_expr_subtype
(args
.last
, msignature
.mparameters
.last
.mtype
)
447 # First, handle named arguments
448 for i
in [0..args
.length
[ do
450 if not e
isa ANamedargExpr then continue
451 var name
= e
.n_id
.text
452 var param
= msignature
.mparameter_by_name
(name
)
453 if param
== null then
454 modelbuilder
.error
(e
.n_id
, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
457 var idx
= msignature
.mparameters
.index_of
(param
)
458 var prev
= map
.map
.get_or_null
(idx
)
460 modelbuilder
.error
(e
, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
464 e
.mtype
= self.visit_expr_subtype
(e
.n_expr
, param
.mtype
)
467 # Number of minimum mandatory remaining parameters
470 # Second, associate remaining parameters
471 var vararg_decl
= args
.length
- msignature
.arity
473 for i
in [0..msignature
.arity
[ do
474 # Skip parameters associated by name
475 if map
.map
.has_key
(i
) then continue
477 var param
= msignature
.mparameters
[i
]
479 # Search the next free argument: skip named arguments since they are already associated
480 while j
< nbargs
and args
[j
] isa ANamedargExpr do j
+= 1
482 if not param
.mtype
isa MNullableType then
492 if i
== vararg_rank
then
494 continue # skip the vararg
497 if not param
.is_vararg
then
498 var paramtype
= param
.mtype
499 self.visit_expr_subtype
(arg
, paramtype
)
501 check_one_vararg
(arg
, param
)
505 if min_arity
> 0 then
506 if last_is_padded
then min_arity
+= 1
507 if min_arity
< msignature
.arity
then
508 modelbuilder
.error
(node
, "Error: expected at least {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
510 modelbuilder
.error
(node
, "Error: expected {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
515 # Third, check varargs
516 if vararg_rank
>= 0 then
517 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
518 var first
= args
[vararg_rank
]
519 if vararg_decl
== 0 then
520 if not check_one_vararg
(first
, msignature
.mparameters
[vararg_rank
]) then return null
522 first
.vararg_decl
= vararg_decl
+ 1
523 for i
in [vararg_rank
..vararg_rank
+vararg_decl
] do
524 self.visit_expr_subtype
(args
[i
], paramtype
)
532 # Check an expression as a single vararg.
533 # The main point of the method if to handle the case of reversed vararg (see `AVarargExpr`)
534 fun check_one_vararg
(arg
: AExpr, param
: MParameter): Bool
536 var paramtype
= param
.mtype
537 var mclass
= get_mclass
(arg
, "Array")
538 if mclass
== null then return false # Forward error
539 var array_mtype
= mclass
.get_mtype
([paramtype
])
540 if arg
isa AVarargExpr then
541 self.visit_expr_subtype
(arg
.n_expr
, array_mtype
)
542 arg
.mtype
= arg
.n_expr
.mtype
544 # only one vararg, maybe `...` was forgot, so be gentle!
545 var t
= visit_expr
(arg
)
546 if t
== null then return false # Forward error
547 if not is_subtype
(t
, paramtype
) and is_subtype
(t
, array_mtype
) then
548 # Not acceptable but could be a `...`
549 error
(arg
, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
552 # Standard valid vararg, finish the job
554 self.visit_expr_subtype
(arg
, paramtype
)
559 fun error
(node
: ANode, message
: String)
561 self.modelbuilder
.error
(node
, message
)
564 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
566 if not variable
.is_adapted
then return variable
.declared_type
568 var flow
= node
.after_flow_context
569 if flow
== null then return null # skip error
571 if flow
.vars
.has_key
(variable
) then
572 return flow
.vars
[variable
]
574 #node.debug("*** START Collected for {variable}")
575 var mtypes
= flow
.collect_types
(variable
)
576 #node.debug("**** END Collected for {variable}")
577 if mtypes
.length
== 0 then
578 return variable
.declared_type
579 else if mtypes
.length
== 1 then
582 var res
= merge_types
(node
,mtypes
)
583 if res
== null then res
= variable
.declared_type
589 # Some variables where type-adapted during the visit
592 # Some loops had been visited during the visit
595 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
597 var flow
= node
.after_flow_context
600 flow
.set_var
(self, variable
, mtype
)
603 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
605 if col
.length
== 1 then return col
.first
607 if t1
== null then continue # return null
610 if t2
== null then continue # return null
611 if can_be_null
(t2
) and not can_be_null
(t1
) then
614 if not is_subtype
(t2
, t1
) then found
= false
617 #print "merge {col.join(" ")} -> {t1}"
621 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
626 # Mapping between parameters and arguments in a call.
628 # Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
630 # The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
632 # Associate a parameter to an argument
633 var map
= new ArrayMap[Int, Int]
636 # A specific method call site with its associated informations.
640 # The associated location of the callsite
641 var location
: Location
643 # The static type of the receiver (possibly unresolved)
646 # The module where the callsite is present
649 # The anchor to use with `recv` or `msignature`
650 var anchor
: nullable MClassType
652 # Is the receiver self?
653 # If "for_self", virtual types of the signature are kept
654 # If "not_for_self", virtual type are erased
655 var recv_is_self
: Bool
657 # The designated method
658 var mproperty
: MMethod
660 # The statically designated method definition
661 # The most specif one, it is.
662 var mpropdef
: MMethodDef
664 # The resolved signature for the receiver
665 var msignature
: MSignature
667 # Is a implicit cast required on erasure typing policy?
668 var erasure_cast
: Bool
670 # The mapping used on the call to associate arguments to parameters
671 # If null then no specific association is required.
672 var signaturemap
: nullable SignatureMap = null
674 private fun check_signature
(v
: TypeVisitor, node
: ANode, args
: Array[AExpr]): Bool
676 var map
= v
.check_signature
(node
, args
, self.mproperty
, self.msignature
)
678 if map
== null then is_broken
= true
684 # The declared type of the variable
685 var declared_type
: nullable MType is writable
687 # Was the variable type-adapted?
688 # This is used to speedup type retrieval while it remains `false`
689 private var is_adapted
= false
692 redef class FlowContext
693 # Store changes of types because of type evolution
694 private var vars
= new HashMap[Variable, nullable MType]
696 # Adapt the variable to a static type
697 # Warning1: do not modify vars directly.
698 # Warning2: sub-flow may have cached a unadapted variable
699 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
701 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
702 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
703 self.vars
[variable
] = mtype
705 variable
.is_adapted
= true
706 #node.debug "set {variable} to {mtype or else "X"}"
709 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
710 private fun collect_types
(variable
: Variable): Array[nullable MType]
712 #node.debug "flow for {variable}"
713 var res
= new Array[nullable MType]
716 var seen
= new HashSet[FlowContext]
717 while not todo
.is_empty
do
719 if f
.is_unreachable
then continue
720 if seen
.has
(f
) then continue
723 if f
.vars
.has_key
(variable
) then
724 # Found something. Collect it and do not process further on this path
725 res
.add f
.vars
[variable
]
726 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
728 todo
.add_all f
.previous
730 if f
.previous
.is_empty
then
731 # Root flowcontext mean a parameter or something related
732 res
.add variable
.declared_type
733 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
737 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
743 # The entry point of the whole typing analysis
744 fun do_typing
(modelbuilder
: ModelBuilder)
748 # The variable associated to the receiver (if any)
749 var selfvariable
: nullable Variable
752 redef class AMethPropdef
753 redef fun do_typing
(modelbuilder
: ModelBuilder)
755 var mpropdef
= self.mpropdef
756 if mpropdef
== null then return # skip error
758 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
759 self.selfvariable
= v
.selfvariable
761 var mmethoddef
= self.mpropdef
.as(not null)
762 var msignature
= mmethoddef
.msignature
763 if msignature
== null then return # skip error
764 for i
in [0..msignature
.arity
[ do
765 var mtype
= msignature
.mparameters
[i
].mtype
766 if msignature
.vararg_rank
== i
then
767 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
768 if arrayclass
== null then return # Skip error
769 mtype
= arrayclass
.get_mtype
([mtype
])
771 var variable
= self.n_signature
.n_params
[i
].variable
772 assert variable
!= null
773 variable
.declared_type
= mtype
776 var nblock
= self.n_block
777 if nblock
== null then return
782 if not v
.has_loop
or not v
.dirty
then break
785 var post_visitor
= new PostTypingVisitor(v
)
786 post_visitor
.enter_visit
(self)
788 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
789 # We reach the end of the function without having a return, it is bad
790 v
.error
(self, "Error: reached end of function; expected `return` with a value.")
795 private class PostTypingVisitor
797 var type_visitor
: TypeVisitor
798 redef fun visit
(n
) do
800 n
.accept_post_typing
(type_visitor
)
801 if n
isa AExpr and n
.mtype
== null and not n
.is_typed
then
808 private fun accept_post_typing
(v
: TypeVisitor) do end
811 redef class AAttrPropdef
812 redef fun do_typing
(modelbuilder
: ModelBuilder)
814 if not has_value
then return
816 var mpropdef
= self.mreadpropdef
817 if mpropdef
== null or mpropdef
.msignature
== null then return # skip error
819 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
820 self.selfvariable
= v
.selfvariable
822 var nexpr
= self.n_expr
823 if nexpr
!= null then
824 var mtype
= self.mtype
825 v
.visit_expr_subtype
(nexpr
, mtype
)
827 var nblock
= self.n_block
828 if nblock
!= null then
830 if not nblock
.after_flow_context
.is_unreachable
then
831 # We reach the end of the init without having a return, it is bad
832 v
.error
(self, "Error: reached end of block; expected `return`.")
841 # The static type of the expression.
842 # null if self is a statement or in case of error
843 var mtype
: nullable MType = null
845 # Is the statement correctly typed?
846 # Used to distinguish errors and statements when `mtype == null`
847 var is_typed
: Bool = false
849 # If required, the following implicit cast `.as(XXX)`
850 # Such a cast may by required after evaluating the expression when
851 # a unsafe operation is detected (silently accepted by the Nit language).
852 # The attribute is computed by `check_subtype`
853 var implicit_cast_to
: nullable MType = null
855 # Return the variable read (if any)
856 # Used to perform adaptive typing
857 fun its_variable
: nullable Variable do return null
859 private fun accept_typing
(v
: TypeVisitor)
861 v
.error
(self, "no implemented accept_typing for {self.class_name}")
864 # Is non-null if `self` is a leaf of a comprehension array construction.
865 # In this case, the enclosing literal array node is designated.
866 # The result of the evaluation of `self` must be
867 # stored inside the designated array (there is an implicit `push`)
868 var comprehension
: nullable AArrayExpr = null
870 # It indicates the number of arguments collected as a vararg.
872 # When 0, the argument is used as is, without transformation.
873 # When 1, the argument is transformed into an singleton array.
874 # Above 1, the arguments and the next ones are transformed into a common array.
876 # This attribute is meaning less on expressions not used as attributes.
877 var vararg_decl
: Int = 0
880 redef class ABlockExpr
881 redef fun accept_typing
(v
)
883 for e
in self.n_expr
do v
.visit_stmt
(e
)
887 # The type of a blockexpr is the one of the last expression (or null if empty)
890 if self.n_expr
.is_empty
then return null
891 return self.n_expr
.last
.mtype
895 redef class AVardeclExpr
896 redef fun accept_typing
(v
)
898 var variable
= self.variable
899 if variable
== null then return # Skip error
901 var ntype
= self.n_type
902 var mtype
: nullable MType
903 if ntype
== null then
906 mtype
= v
.resolve_mtype
(ntype
)
907 if mtype
== null then return # Skip error
910 var nexpr
= self.n_expr
911 if nexpr
!= null then
912 if mtype
!= null then
913 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
914 if etype
== mtype
then
916 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
919 mtype
= v
.visit_expr
(nexpr
)
920 if mtype
== null then return # Skip error
925 if mtype
== null or mtype
isa MNullType then
926 var objclass
= v
.get_mclass
(self, "Object")
927 if objclass
== null then return # skip error
928 decltype
= objclass
.mclass_type
.as_nullable
929 if mtype
== null then mtype
= decltype
932 variable
.declared_type
= decltype
933 v
.set_variable
(self, variable
, mtype
)
935 #debug("var {variable}: {mtype}")
943 redef fun its_variable
do return self.variable
944 redef fun accept_typing
(v
)
946 var variable
= self.variable
947 if variable
== null then return # Skip error
949 var mtype
= v
.get_variable
(self, variable
)
950 if mtype
!= null then
951 #debug("{variable} is {mtype}")
953 #debug("{variable} is untyped")
960 redef class AVarAssignExpr
961 redef fun accept_typing
(v
)
963 var variable
= self.variable
964 assert variable
!= null
966 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
968 v
.set_variable
(self, variable
, mtype
)
974 redef class AReassignFormExpr
975 # The method designed by the reassign operator.
976 var reassign_callsite
: nullable CallSite
978 var read_type
: nullable MType = null
980 # Determine the `reassign_property`
981 # `readtype` is the type of the reading of the left value.
982 # `writetype` is the type of the writing of the left value.
983 # (Because of `ACallReassignExpr`, both can be different.
984 # Return the static type of the value to store.
985 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
987 var reassign_name
= self.n_assign_op
.operator
989 self.read_type
= readtype
991 var callsite
= v
.get_method
(self.n_assign_op
, readtype
, reassign_name
, false)
992 if callsite
== null then return null # Skip error
993 self.reassign_callsite
= callsite
995 var msignature
= callsite
.msignature
996 var rettype
= msignature
.return_mtype
997 assert msignature
.arity
== 1 and rettype
!= null
999 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
1000 if value_type
== null then return null # Skip error
1002 v
.check_subtype
(self, rettype
, writetype
, false)
1007 redef class AVarReassignExpr
1008 redef fun accept_typing
(v
)
1010 var variable
= self.variable
1011 assert variable
!= null
1013 var readtype
= v
.get_variable
(self, variable
)
1014 if readtype
== null then return
1016 read_type
= readtype
1018 var writetype
= variable
.declared_type
1019 if writetype
== null then return
1021 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
1023 v
.set_variable
(self, variable
, rettype
)
1025 self.is_typed
= rettype
!= null
1030 redef class AContinueExpr
1031 redef fun accept_typing
(v
)
1033 var nexpr
= self.n_expr
1034 if nexpr
!= null then
1037 self.is_typed
= true
1041 redef class ABreakExpr
1042 redef fun accept_typing
(v
)
1044 var nexpr
= self.n_expr
1045 if nexpr
!= null then
1048 self.is_typed
= true
1052 redef class AReturnExpr
1053 redef fun accept_typing
(v
)
1055 var nexpr
= self.n_expr
1057 var mpropdef
= v
.mpropdef
1058 if mpropdef
isa MMethodDef then
1059 ret_type
= mpropdef
.msignature
.return_mtype
1060 else if mpropdef
isa MAttributeDef then
1061 ret_type
= mpropdef
.static_mtype
1065 if nexpr
!= null then
1066 if ret_type
!= null then
1067 v
.visit_expr_subtype
(nexpr
, ret_type
)
1070 v
.error
(nexpr
, "Error: `return` with value in a procedure.")
1073 else if ret_type
!= null then
1074 v
.error
(self, "Error: `return` without value in a function.")
1077 self.is_typed
= true
1081 redef class AAbortExpr
1082 redef fun accept_typing
(v
)
1084 self.is_typed
= true
1089 redef fun accept_typing
(v
)
1091 v
.visit_expr_bool
(n_expr
)
1093 v
.visit_stmt
(n_then
)
1094 v
.visit_stmt
(n_else
)
1096 self.is_typed
= true
1098 if n_then
!= null and n_else
== null then
1099 self.mtype
= n_then
.mtype
1104 redef class AIfexprExpr
1105 redef fun accept_typing
(v
)
1107 v
.visit_expr_bool
(n_expr
)
1109 var t1
= v
.visit_expr
(n_then
)
1110 var t2
= v
.visit_expr
(n_else
)
1112 if t1
== null or t2
== null then
1116 var t
= v
.merge_types
(self, [t1
, t2
])
1118 v
.error
(self, "Type Error: ambiguous type `{t1}` vs `{t2}`.")
1125 redef fun accept_typing
(v
)
1127 v
.visit_stmt
(n_block
)
1128 self.is_typed
= true
1132 redef class AWhileExpr
1133 redef fun accept_typing
(v
)
1136 v
.visit_expr_bool
(n_expr
)
1137 v
.visit_stmt
(n_block
)
1138 self.is_typed
= true
1142 redef class ALoopExpr
1143 redef fun accept_typing
(v
)
1146 v
.visit_stmt
(n_block
)
1147 self.is_typed
= true
1151 redef class AForExpr
1152 redef fun accept_typing
(v
)
1156 for g
in n_groups
do
1157 var mtype
= v
.visit_expr
(g
.n_expr
)
1158 if mtype
== null then return
1159 g
.do_type_iterator
(v
, mtype
)
1160 if g
.is_broken
then is_broken
= true
1163 v
.visit_stmt
(n_block
)
1165 self.mtype
= n_block
.mtype
1166 self.is_typed
= true
1170 redef class AForGroup
1171 var coltype
: nullable MClassType
1173 var method_iterator
: nullable CallSite
1174 var method_is_ok
: nullable CallSite
1175 var method_item
: nullable CallSite
1176 var method_next
: nullable CallSite
1177 var method_key
: nullable CallSite
1178 var method_finish
: nullable CallSite
1180 var method_lt
: nullable CallSite
1181 var method_successor
: nullable CallSite
1183 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1185 if mtype
isa MNullType then
1186 v
.error
(self, "Type Error: `for` cannot iterate over `null`.")
1191 var objcla
= v
.get_mclass
(self, "Object")
1192 if objcla
== null then return
1194 # check iterator method
1195 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1196 if itdef
== null then
1197 v
.error
(self, "Type Error: `for` expects a type providing an `iterator` method, got `{mtype}`.")
1200 self.method_iterator
= itdef
1202 # check that iterator return something
1203 var ittype
= itdef
.msignature
.return_mtype
1204 if ittype
== null then
1205 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1210 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1211 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1215 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1217 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1218 var variables
= self.variables
1219 if variables
.length
!= 1 then
1220 v
.error
(self, "Type Error: `for` expects only one variable when using `Iterator`.")
1222 variables
.first
.declared_type
= coltype
.arguments
.first
1227 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1229 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1230 var variables
= self.variables
1231 if variables
.length
!= 2 then
1232 v
.error
(self, "Type Error: `for` expects two variables when using `MapIterator`.")
1234 variables
[0].declared_type
= coltype
.arguments
[0]
1235 variables
[1].declared_type
= coltype
.arguments
[1]
1240 if not is_col
and not is_map
then
1241 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1245 # anchor formal and virtual types
1246 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1248 mtype
= mtype
.undecorate
1249 self.coltype
= mtype
.as(MClassType)
1251 # get methods is_ok, next, item
1252 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1253 if ikdef
== null then
1254 v
.error
(self, "Type Error: `for` expects a method `is_ok` in type `{ittype}`.")
1257 self.method_is_ok
= ikdef
1259 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1260 if itemdef
== null then
1261 v
.error
(self, "Type Error: `for` expects a method `item` in type `{ittype}`.")
1264 self.method_item
= itemdef
1266 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1267 if nextdef
== null then
1268 v
.error
(self, "Type Error: `for` expects a method `next` in type {ittype}.")
1271 self.method_next
= nextdef
1273 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1276 var keydef
= v
.get_method
(self, ittype
, "key", false)
1277 if keydef
== null then
1278 v
.error
(self, "Type Error: `for` expects a method `key` in type `{ittype}`.")
1281 self.method_key
= keydef
1284 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1285 var variable
= variables
.first
1286 var vtype
= variable
.declared_type
.as(not null)
1288 if n_expr
isa AOrangeExpr then
1289 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1291 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1294 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1299 redef class AWithExpr
1300 var method_start
: nullable CallSite
1301 var method_finish
: nullable CallSite
1303 redef fun accept_typing
(v
: TypeVisitor)
1305 var mtype
= v
.visit_expr
(n_expr
)
1306 if mtype
== null then return
1308 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1309 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1311 v
.visit_stmt
(n_block
)
1312 self.mtype
= n_block
.mtype
1313 self.is_typed
= true
1317 redef class AAssertExpr
1318 redef fun accept_typing
(v
)
1320 v
.visit_expr_bool
(n_expr
)
1322 v
.visit_stmt
(n_else
)
1323 self.is_typed
= true
1328 redef fun accept_typing
(v
)
1330 v
.visit_expr_bool
(n_expr
)
1331 v
.visit_expr_bool
(n_expr2
)
1332 self.mtype
= v
.type_bool
(self)
1336 redef class AImpliesExpr
1337 redef fun accept_typing
(v
)
1339 v
.visit_expr_bool
(n_expr
)
1340 v
.visit_expr_bool
(n_expr2
)
1341 self.mtype
= v
.type_bool
(self)
1345 redef class AAndExpr
1346 redef fun accept_typing
(v
)
1348 v
.visit_expr_bool
(n_expr
)
1349 v
.visit_expr_bool
(n_expr2
)
1350 self.mtype
= v
.type_bool
(self)
1355 redef class ANotExpr
1356 redef fun accept_typing
(v
)
1358 v
.visit_expr_bool
(n_expr
)
1359 self.mtype
= v
.type_bool
(self)
1363 redef class AOrElseExpr
1364 redef fun accept_typing
(v
)
1366 var t1
= v
.visit_expr
(n_expr
)
1367 var t2
= v
.visit_expr
(n_expr2
)
1369 if t1
== null or t2
== null then
1373 if t1
isa MNullType then
1376 else if v
.can_be_null
(t1
) then
1380 var t
= v
.merge_types
(self, [t1
, t2
])
1382 var c
= v
.get_mclass
(self, "Object")
1383 if c
== null then return # forward error
1385 if v
.can_be_null
(t2
) then
1388 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1393 redef fun accept_post_typing
(v
)
1395 var t1
= n_expr
.mtype
1399 v
.check_can_be_null
(n_expr
, t1
)
1404 redef class ATrueExpr
1405 redef fun accept_typing
(v
)
1407 self.mtype
= v
.type_bool
(self)
1411 redef class AFalseExpr
1412 redef fun accept_typing
(v
)
1414 self.mtype
= v
.type_bool
(self)
1418 redef class AIntegerExpr
1419 redef fun accept_typing
(v
)
1421 var mclass
: nullable MClass = null
1422 if value
isa Byte then
1423 mclass
= v
.get_mclass
(self, "Byte")
1424 else if value
isa Int then
1425 mclass
= v
.get_mclass
(self, "Int")
1426 else if value
isa Int8 then
1427 mclass
= v
.get_mclass
(self, "Int8")
1428 else if value
isa Int16 then
1429 mclass
= v
.get_mclass
(self, "Int16")
1430 else if value
isa UInt16 then
1431 mclass
= v
.get_mclass
(self, "UInt16")
1432 else if value
isa Int32 then
1433 mclass
= v
.get_mclass
(self, "Int32")
1434 else if value
isa UInt32 then
1435 mclass
= v
.get_mclass
(self, "UInt32")
1437 if mclass
== null then return # Forward error
1438 self.mtype
= mclass
.mclass_type
1442 redef class AFloatExpr
1443 redef fun accept_typing
(v
)
1445 var mclass
= v
.get_mclass
(self, "Float")
1446 if mclass
== null then return # Forward error
1447 self.mtype
= mclass
.mclass_type
1451 redef class ACharExpr
1452 redef fun accept_typing
(v
)
1454 var mclass
= v
.get_mclass
(self, "Char")
1455 if mclass
== null then return # Forward error
1456 self.mtype
= mclass
.mclass_type
1460 redef class AStringFormExpr
1461 redef fun accept_typing
(v
)
1463 var mclass
= v
.get_mclass
(self, "String")
1464 if mclass
== null then return # Forward error
1465 self.mtype
= mclass
.mclass_type
1469 redef class ASuperstringExpr
1470 redef fun accept_typing
(v
)
1472 var mclass
= v
.get_mclass
(self, "String")
1473 if mclass
== null then return # Forward error
1474 self.mtype
= mclass
.mclass_type
1475 var objclass
= v
.get_mclass
(self, "Object")
1476 if objclass
== null then return # Forward error
1477 var objtype
= objclass
.mclass_type
1478 for nexpr
in self.n_exprs
do
1479 v
.visit_expr_subtype
(nexpr
, objtype
)
1484 redef class AArrayExpr
1485 # The `with_capacity` method on Array
1486 var with_capacity_callsite
: nullable CallSite
1488 # The `push` method on arrays
1489 var push_callsite
: nullable CallSite
1491 # The element of each type
1492 var element_mtype
: nullable MType
1494 # Set that `self` is a part of comprehension array `na`
1495 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1496 private fun set_comprehension
(n
: nullable AExpr)
1500 else if n
isa AForExpr then
1501 set_comprehension
(n
.n_block
)
1502 else if n
isa AIfExpr then
1503 set_comprehension
(n
.n_then
)
1504 set_comprehension
(n
.n_else
)
1507 n
.comprehension
= self
1510 redef fun accept_typing
(v
)
1512 var mtype
: nullable MType = null
1513 var ntype
= self.n_type
1514 if ntype
!= null then
1515 mtype
= v
.resolve_mtype
(ntype
)
1516 if mtype
== null then return # Skip error
1518 var mtypes
= new Array[nullable MType]
1520 for e
in self.n_exprs
do
1521 var t
= v
.visit_expr
(e
)
1525 set_comprehension
(e
)
1526 if mtype
!= null then
1527 if v
.check_subtype
(e
, t
, mtype
, false) == null then return # Forward error
1528 if t
== mtype
then useless
= true
1533 if mtype
== null then
1534 # Ensure monotony for type adaptation on loops
1535 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1536 mtype
= v
.merge_types
(self, mtypes
)
1538 if mtype
== null or mtype
isa MNullType then
1539 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1543 assert ntype
!= null
1544 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1547 self.element_mtype
= mtype
1549 var mclass
= v
.get_mclass
(self, "Array")
1550 if mclass
== null then return # Forward error
1551 var array_mtype
= mclass
.get_mtype
([mtype
])
1553 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1554 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1556 self.mtype
= array_mtype
1560 redef class ARangeExpr
1561 var init_callsite
: nullable CallSite
1563 redef fun accept_typing
(v
)
1565 var discrete_class
= v
.get_mclass
(self, "Discrete")
1566 if discrete_class
== null then return # Forward error
1567 var discrete_type
= discrete_class
.intro
.bound_mtype
1568 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1569 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1570 if t1
== null or t2
== null then return
1571 var mclass
= v
.get_mclass
(self, "Range")
1572 if mclass
== null then return # Forward error
1574 if v
.is_subtype
(t1
, t2
) then
1575 mtype
= mclass
.get_mtype
([t2
])
1576 else if v
.is_subtype
(t2
, t1
) then
1577 mtype
= mclass
.get_mtype
([t1
])
1579 v
.error
(self, "Type Error: cannot create range: `{t1}` vs `{t2}`.")
1585 # get the constructor
1587 if self isa ACrangeExpr then
1588 callsite
= v
.get_method
(self, mtype
, "autoinit", false)
1589 else if self isa AOrangeExpr then
1590 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1594 init_callsite
= callsite
1598 redef class ANullExpr
1599 redef fun accept_typing
(v
)
1601 self.mtype
= v
.mmodule
.model
.null_type
1605 redef class AIsaExpr
1606 # The static type to cast to.
1607 # (different from the static type of the expression that is `Bool`).
1608 var cast_type
: nullable MType
1609 redef fun accept_typing
(v
)
1611 v
.visit_expr
(n_expr
)
1613 var mtype
= v
.resolve_mtype
(n_type
)
1615 self.cast_type
= mtype
1617 var variable
= self.n_expr
.its_variable
1618 if variable
!= null then
1619 #var orig = self.n_expr.mtype
1620 #var from = if orig != null then orig.to_s else "invalid"
1621 #var to = if mtype != null then mtype.to_s else "invalid"
1622 #debug("adapt {variable}: {from} -> {to}")
1623 self.after_flow_context
.when_true
.set_var
(v
, variable
, mtype
)
1626 self.mtype
= v
.type_bool
(self)
1629 redef fun accept_post_typing
(v
)
1631 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1635 redef class AAsCastExpr
1636 redef fun accept_typing
(v
)
1638 v
.visit_expr
(n_expr
)
1640 self.mtype
= v
.resolve_mtype
(n_type
)
1643 redef fun accept_post_typing
(v
)
1645 v
.check_expr_cast
(self, self.n_expr
, self.n_type
)
1649 redef class AAsNotnullExpr
1650 redef fun accept_typing
(v
)
1652 var mtype
= v
.visit_expr
(self.n_expr
)
1653 if mtype
== null then return # Forward error
1655 if mtype
isa MNullType then
1656 v
.error
(self, "Type Error: `as(not null)` on `null`.")
1660 if v
.can_be_null
(mtype
) then
1661 mtype
= mtype
.as_notnull
1667 redef fun accept_post_typing
(v
)
1669 var mtype
= n_expr
.mtype
1670 if mtype
== null then return
1671 v
.check_can_be_null
(n_expr
, mtype
)
1675 redef class AParExpr
1676 redef fun accept_typing
(v
)
1678 self.mtype
= v
.visit_expr
(self.n_expr
)
1682 redef class AOnceExpr
1683 redef fun accept_typing
(v
)
1685 self.mtype
= v
.visit_expr
(self.n_expr
)
1689 redef class ASelfExpr
1690 redef var its_variable
: nullable Variable
1691 redef fun accept_typing
(v
)
1693 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1694 v
.error
(self, "Error: `self` cannot be used in top-level method.")
1696 var variable
= v
.selfvariable
1697 self.its_variable
= variable
1698 self.mtype
= v
.get_variable
(self, variable
)
1702 redef class AImplicitSelfExpr
1703 # Is the implicit receiver `sys`?
1705 # By default, the implicit receiver is `self`.
1706 # But when there is not method for `self`, `sys` is used as a fall-back.
1707 # Is this case this flag is set to `true`.
1711 ## MESSAGE SENDING AND PROPERTY
1713 redef class ASendExpr
1714 # The property invoked by the send.
1715 var callsite
: nullable CallSite
1717 redef fun accept_typing
(v
)
1719 var nrecv
= self.n_expr
1720 var recvtype
= v
.visit_expr
(nrecv
)
1721 var name
= self.property_name
1722 var node
= self.property_node
1724 if recvtype
== null then return # Forward error
1727 var unsafe_type
= v
.anchor_to
(recvtype
)
1728 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1729 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1730 # Special fall-back search in `sys` when noting found in the implicit receiver.
1731 var sysclass
= v
.try_get_mclass
(node
, "Sys")
1732 if sysclass
!= null then
1733 var systype
= sysclass
.mclass_type
1734 mproperty
= v
.try_get_mproperty_by_name2
(node
, systype
, name
)
1735 if mproperty
!= null then
1736 callsite
= v
.get_method
(node
, systype
, name
, false)
1737 if callsite
== null then return # Forward error
1738 # Update information, we are looking at `sys` now, not `self`
1740 nrecv
.its_variable
= null
1741 nrecv
.mtype
= systype
1746 if callsite
== null then
1747 # If still nothing, just exit
1748 callsite
= v
.get_method
(node
, recvtype
, name
, nrecv
isa ASelfExpr)
1749 if callsite
== null then return
1752 self.callsite
= callsite
1753 var msignature
= callsite
.msignature
1755 var args
= compute_raw_arguments
1757 callsite
.check_signature
(v
, node
, args
)
1759 if callsite
.mproperty
.is_init
then
1760 var vmpropdef
= v
.mpropdef
1761 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1762 v
.error
(node
, "Error: an `init` can only be called from another `init`.")
1764 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1765 v
.error
(node
, "Error: `{vmpropdef}` cannot call a factory `{callsite.mproperty}`.")
1769 var ret
= msignature
.return_mtype
1773 self.is_typed
= true
1777 # The name of the property
1778 # Each subclass simply provide the correct name.
1779 private fun property_name
: String is abstract
1781 # The node identifying the name (id, operator, etc) for messages.
1783 # Is `self` by default
1784 private fun property_node
: ANode do return self
1786 # An array of all arguments (excluding self)
1787 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1789 private fun compute_raw_arguments
: Array[AExpr] is abstract
1792 redef class ABinopExpr
1793 redef fun compute_raw_arguments
do return [n_expr2
]
1794 redef fun property_name
do return operator
1795 redef fun property_node
do return n_op
1798 redef class AEqFormExpr
1799 redef fun accept_typing
(v
)
1805 redef fun accept_post_typing
(v
)
1807 var mtype
= n_expr
.mtype
1808 var mtype2
= n_expr2
.mtype
1810 if mtype
== null or mtype2
== null then return
1812 if not mtype2
isa MNullType then return
1814 v
.check_can_be_null
(n_expr
, mtype
)
1818 redef class AUnaryopExpr
1819 redef fun property_name
do return "unary {operator}"
1820 redef fun compute_raw_arguments
do return new Array[AExpr]
1824 redef class ACallExpr
1825 redef fun property_name
do return n_qid
.n_id
.text
1826 redef fun property_node
do return n_qid
1827 redef fun compute_raw_arguments
do return n_args
.to_a
1830 redef class ACallAssignExpr
1831 redef fun property_name
do return n_qid
.n_id
.text
+ "="
1832 redef fun property_node
do return n_qid
1833 redef fun compute_raw_arguments
1835 var res
= n_args
.to_a
1841 redef class ABraExpr
1842 redef fun property_name
do return "[]"
1843 redef fun compute_raw_arguments
do return n_args
.to_a
1846 redef class ABraAssignExpr
1847 redef fun property_name
do return "[]="
1848 redef fun compute_raw_arguments
1850 var res
= n_args
.to_a
1856 redef class ASendReassignFormExpr
1857 # The property invoked for the writing
1858 var write_callsite
: nullable CallSite
1860 redef fun accept_typing
(v
)
1862 var recvtype
= v
.visit_expr
(self.n_expr
)
1863 var name
= self.property_name
1864 var node
= self.property_node
1866 if recvtype
== null then return # Forward error
1868 var for_self
= self.n_expr
isa ASelfExpr
1869 var callsite
= v
.get_method
(node
, recvtype
, name
, for_self
)
1871 if callsite
== null then return
1872 self.callsite
= callsite
1874 var args
= compute_raw_arguments
1876 callsite
.check_signature
(v
, node
, args
)
1878 var readtype
= callsite
.msignature
.return_mtype
1879 if readtype
== null then
1880 v
.error
(node
, "Error: `{name}` is not a function.")
1884 var wcallsite
= v
.get_method
(node
, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1885 if wcallsite
== null then return
1886 self.write_callsite
= wcallsite
1888 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1889 if wtype
== null then return
1891 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1892 args
.add
(self.n_value
)
1893 wcallsite
.check_signature
(v
, node
, args
)
1895 self.is_typed
= true
1899 redef class ACallReassignExpr
1900 redef fun property_name
do return n_qid
.n_id
.text
1901 redef fun property_node
do return n_qid
.n_id
1902 redef fun compute_raw_arguments
do return n_args
.to_a
1905 redef class ABraReassignExpr
1906 redef fun property_name
do return "[]"
1907 redef fun compute_raw_arguments
do return n_args
.to_a
1910 redef class AInitExpr
1911 redef fun property_name
do if n_args
.n_exprs
.is_empty
then return "init" else return "autoinit"
1912 redef fun property_node
do return n_kwinit
1913 redef fun compute_raw_arguments
do return n_args
.to_a
1917 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1922 redef class ASuperExpr
1923 # The method to call if the super is in fact a 'super init call'
1924 # Note: if the super is a normal call-next-method, then this attribute is null
1925 var callsite
: nullable CallSite
1927 # The method to call is the super is a standard `call-next-method` super-call
1928 # Note: if the super is a special super-init-call, then this attribute is null
1929 var mpropdef
: nullable MMethodDef
1931 redef fun accept_typing
(v
)
1933 var anchor
= v
.anchor
1934 assert anchor
!= null
1935 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1936 assert recvtype
!= null
1937 var mproperty
= v
.mpropdef
.mproperty
1938 if not mproperty
isa MMethod then
1939 v
.error
(self, "Error: `super` only usable in a `method`.")
1942 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1943 if superprops
.length
== 0 then
1944 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1945 process_superinit
(v
)
1948 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
1951 # FIXME: covariance of return type in linear extension?
1952 var superprop
= superprops
.first
1954 var msignature
= superprop
.msignature
.as(not null)
1955 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1956 var args
= self.n_args
.to_a
1957 if args
.length
> 0 then
1958 signaturemap
= v
.check_signature
(self, args
, mproperty
, msignature
)
1960 self.mtype
= msignature
.return_mtype
1961 self.is_typed
= true
1962 v
.mpropdef
.has_supercall
= true
1963 mpropdef
= v
.mpropdef
.as(MMethodDef)
1966 # The mapping used on the call to associate arguments to parameters.
1967 # If null then no specific association is required.
1968 var signaturemap
: nullable SignatureMap
1970 private fun process_superinit
(v
: TypeVisitor)
1972 var anchor
= v
.anchor
1973 assert anchor
!= null
1974 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1975 assert recvtype
!= null
1976 var mpropdef
= v
.mpropdef
1977 assert mpropdef
isa MMethodDef
1978 var mproperty
= mpropdef
.mproperty
1979 var superprop
: nullable MMethodDef = null
1980 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1981 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1982 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1983 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1984 if candidate
== null then
1985 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1986 continue # Try next super-class
1988 if superprop
!= null and candidate
.is_root_init
then
1991 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1992 v
.error
(self, "Error: conflicting super constructor to call for `{mproperty}`: `{candidate.full_name}`, `{superprop.mproperty.full_name}`")
1995 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1996 if superprop
!= null and superprop
.mproperty
== candidate
then
1997 if superprop
== candidatedefs
.first
then continue
1998 candidatedefs
.add
(superprop
)
2000 if candidatedefs
.length
> 1 then
2001 v
.error
(self, "Error: conflicting property definitions for property `{mproperty}` in `{recvtype}`: {candidatedefs.join(", ")}")
2004 superprop
= candidatedefs
.first
2006 if superprop
== null then
2007 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
2011 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
2012 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
2014 var callsite
= new CallSite(hot_location
, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
2015 self.callsite
= callsite
2017 var args
= self.n_args
.to_a
2018 if args
.length
> 0 then
2019 callsite
.check_signature
(v
, self, args
)
2021 # Check there is at least enough parameters
2022 if mpropdef
.msignature
.arity
< msignature
.arity
then
2023 v
.error
(self, "Error: not enough implicit arguments to pass. Got `{mpropdef.msignature.arity}`, expected at least `{msignature.arity}`. Signature is `{msignature}`.")
2026 # Check that each needed parameter is conform
2028 for sp
in msignature
.mparameters
do
2029 var p
= mpropdef
.msignature
.mparameters
[i
]
2030 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
2031 v
.error
(self, "Type Error: expected argument #{i} of type `{sp.mtype}`, got implicit argument `{p.name}` of type `{p.mtype}`. Signature is {msignature}")
2038 self.is_typed
= true
2044 redef class ANewExpr
2045 # The constructor invoked by the new.
2046 var callsite
: nullable CallSite
2048 # The designated type
2049 var recvtype
: nullable MClassType
2051 redef fun accept_typing
(v
)
2053 var recvtype
= v
.resolve_mtype
(self.n_type
)
2054 if recvtype
== null then return
2056 if not recvtype
isa MClassType then
2057 if recvtype
isa MNullableType then
2058 v
.error
(self, "Type Error: cannot instantiate the nullable type `{recvtype}`.")
2060 else if recvtype
isa MFormalType then
2061 v
.error
(self, "Type Error: cannot instantiate the formal type `{recvtype}`.")
2064 v
.error
(self, "Type Error: cannot instantiate the type `{recvtype}`.")
2069 self.recvtype
= recvtype
2070 var kind
= recvtype
.mclass
.kind
2073 var nqid
= self.n_qid
2075 if nqid
!= null then
2076 name
= nqid
.n_id
.text
2082 if name
== "intern" then
2083 if kind
!= concrete_kind
then
2084 v
.error
(self, "Type Error: cannot instantiate {kind} {recvtype}.")
2087 if n_args
.n_exprs
.not_empty
then
2088 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
2092 self.mtype
= recvtype
2096 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
2097 if callsite
== null then return
2099 if not callsite
.mproperty
.is_new
then
2100 if kind
!= concrete_kind
then
2101 v
.error
(self, "Type Error: cannot instantiate {kind} `{recvtype}`.")
2104 self.mtype
= recvtype
2106 self.mtype
= callsite
.msignature
.return_mtype
2107 assert self.mtype
!= null
2110 self.callsite
= callsite
2112 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
2113 v
.error
(self, "Error: `{name}` is not a constructor.")
2117 var args
= n_args
.to_a
2118 callsite
.check_signature
(v
, node
, args
)
2124 redef class AAttrFormExpr
2125 # The attribute accessed.
2126 var mproperty
: nullable MAttribute
2128 # The static type of the attribute.
2129 var attr_type
: nullable MType
2131 # Resolve the attribute accessed.
2132 private fun resolve_property
(v
: TypeVisitor)
2134 var recvtype
= v
.visit_expr
(self.n_expr
)
2135 if recvtype
== null then return # Skip error
2136 var node
= self.n_id
2137 var name
= node
.text
2138 if recvtype
isa MNullType then
2139 v
.error
(node
, "Error: attribute `{name}` access on `null`.")
2143 var unsafe_type
= v
.anchor_to
(recvtype
)
2144 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
2145 if mproperty
== null then
2146 v
.modelbuilder
.error
(node
, "Error: attribute `{name}` does not exist in `{recvtype}`.")
2149 assert mproperty
isa MAttribute
2150 self.mproperty
= mproperty
2152 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
2153 assert mpropdefs
.length
== 1
2154 var mpropdef
= mpropdefs
.first
2155 var attr_type
= mpropdef
.static_mtype
2156 if attr_type
== null then return # skip error
2157 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
2158 self.attr_type
= attr_type
2162 redef class AAttrExpr
2163 redef fun accept_typing
(v
)
2165 self.resolve_property
(v
)
2166 self.mtype
= self.attr_type
2171 redef class AAttrAssignExpr
2172 redef fun accept_typing
(v
)
2174 self.resolve_property
(v
)
2175 var mtype
= self.attr_type
2177 v
.visit_expr_subtype
(self.n_value
, mtype
)
2178 self.is_typed
= mtype
!= null
2182 redef class AAttrReassignExpr
2183 redef fun accept_typing
(v
)
2185 self.resolve_property
(v
)
2186 var mtype
= self.attr_type
2187 if mtype
== null then return # Skip error
2189 var rettype
= self.resolve_reassignment
(v
, mtype
, mtype
)
2191 self.is_typed
= rettype
!= null
2195 redef class AIssetAttrExpr
2196 redef fun accept_typing
(v
)
2198 self.resolve_property
(v
)
2199 var mtype
= self.attr_type
2200 if mtype
== null then return # Skip error
2202 var recvtype
= self.n_expr
.mtype
.as(not null)
2203 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2204 if bound
isa MNullableType then
2205 v
.error
(n_id
, "Type Error: `isset` on a nullable attribute.")
2207 self.mtype
= v
.type_bool
(self)
2211 redef class AVarargExpr
2212 redef fun accept_typing
(v
)
2214 # This kind of pseudo-expression can be only processed trough a signature
2215 # See `check_signature`
2216 # Other cases are a syntax error.
2217 v
.error
(self, "Syntax Error: unexpected `...`.")
2223 redef class ADebugTypeExpr
2224 redef fun accept_typing
(v
)
2226 var expr
= v
.visit_expr
(self.n_expr
)
2227 if expr
== null then return
2228 var unsafe
= v
.anchor_to
(expr
)
2229 var ntype
= self.n_type
2230 var mtype
= v
.resolve_mtype
(ntype
)
2231 if mtype
!= null and mtype
!= expr
then
2232 var umtype
= v
.anchor_to
(mtype
)
2233 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2235 self.is_typed
= true