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
431 # First, handle named arguments
432 for i
in [0..args
.length
[ do
434 if not e
isa ANamedargExpr then continue
435 var name
= e
.n_id
.text
436 var param
= msignature
.mparameter_by_name
(name
)
437 if param
== null then
438 modelbuilder
.error
(e
.n_id
, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
441 if not param
.is_default
then
442 modelbuilder
.error
(e
, "Error: parameter `{name}` is not optional for `{mproperty}{msignature}`.")
445 var idx
= msignature
.mparameters
.index_of
(param
)
446 var prev
= map
.map
.get_or_null
(idx
)
448 modelbuilder
.error
(e
, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
453 e
.mtype
= self.visit_expr_subtype
(e
.n_expr
, param
.mtype
)
456 # Second, associate remaining parameters
457 var vararg_decl
= args
.length
- msignature
.arity
459 for i
in [0..msignature
.arity
[ do
460 # Skip parameters associated by name
461 if map
.map
.has_key
(i
) then continue
463 var param
= msignature
.mparameters
[i
]
464 if param
.is_default
then
472 # Search the next free argument: skip named arguments since they are already associated
473 while args
[j
] isa ANamedargExpr do j
+= 1
478 if i
== vararg_rank
then
480 continue # skip the vararg
483 var paramtype
= param
.mtype
484 self.visit_expr_subtype
(arg
, paramtype
)
487 # Third, check varargs
488 if vararg_rank
>= 0 then
489 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
490 var first
= args
[vararg_rank
]
491 if vararg_decl
== 0 then
492 var mclass
= get_mclass
(node
, "Array")
493 if mclass
== null then return null # Forward error
494 var array_mtype
= mclass
.get_mtype
([paramtype
])
495 if first
isa AVarargExpr then
496 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
497 first
.mtype
= first
.n_expr
.mtype
499 # only one vararg, maybe `...` was forgot, so be gentle!
500 var t
= visit_expr
(first
)
501 if t
== null then return null # Forward error
502 if not is_subtype
(t
, paramtype
) and is_subtype
(t
, array_mtype
) then
503 # Not acceptable but could be a `...`
504 error
(first
, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
507 # Standard valid vararg, finish the job
509 self.visit_expr_subtype
(first
, paramtype
)
512 map
.vararg_decl
= vararg_decl
+ 1
513 for i
in [vararg_rank
..vararg_rank
+vararg_decl
] do
514 self.visit_expr_subtype
(args
[i
], paramtype
)
522 fun error
(node
: ANode, message
: String)
524 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
527 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
529 if not variable
.is_adapted
then return variable
.declared_type
531 var flow
= node
.after_flow_context
532 if flow
== null then return null # skip error
534 if flow
.vars
.has_key
(variable
) then
535 return flow
.vars
[variable
]
537 #node.debug("*** START Collected for {variable}")
538 var mtypes
= flow
.collect_types
(variable
)
539 #node.debug("**** END Collected for {variable}")
540 if mtypes
.length
== 0 then
541 return variable
.declared_type
542 else if mtypes
.length
== 1 then
545 var res
= merge_types
(node
,mtypes
)
546 if res
== null then res
= variable
.declared_type
552 # Some variables where type-adapted during the visit
555 # Some loops had been visited during the visit
558 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
560 var flow
= node
.after_flow_context
563 flow
.set_var
(self, variable
, mtype
)
566 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
568 if col
.length
== 1 then return col
.first
570 if t1
== null then continue # return null
573 if t2
== null then continue # return null
574 if can_be_null
(t2
) and not can_be_null
(t1
) then
577 if not is_subtype
(t2
, t1
) then found
= false
580 #print "merge {col.join(" ")} -> {t1}"
584 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
589 # Mapping between parameters and arguments in a call.
591 # Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
593 # The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
595 # Associate a parameter to an argument
596 var map
= new ArrayMap[Int, Int]
598 # The length of the vararg sequence
599 # 0 if no vararg or if reverse vararg (cf `AVarargExpr`)
600 var vararg_decl
: Int = 0
603 # A specific method call site with its associated informations.
605 # The associated node for location
608 # The static type of the receiver (possibly unresolved)
611 # The module where the callsite is present
614 # The anchor to use with `recv` or `msignature`
615 var anchor
: nullable MClassType
617 # Is the receiver self?
618 # If "for_self", virtual types of the signature are kept
619 # If "not_for_self", virtual type are erased
620 var recv_is_self
: Bool
622 # The designated method
623 var mproperty
: MMethod
625 # The statically designated method definition
626 # The most specif one, it is.
627 var mpropdef
: MMethodDef
629 # The resolved signature for the receiver
630 var msignature
: MSignature
632 # Is a implicit cast required on erasure typing policy?
633 var erasure_cast
: Bool
635 # The mapping used on the call to associate arguments to parameters
636 # If null then no specific association is required.
637 var signaturemap
: nullable SignatureMap = null
639 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
641 var map
= v
.check_signature
(self.node
, args
, self.mproperty
, self.msignature
)
648 # The declared type of the variable
649 var declared_type
: nullable MType
651 # Was the variable type-adapted?
652 # This is used to speedup type retrieval while it remains `false`
653 private var is_adapted
= false
656 redef class FlowContext
657 # Store changes of types because of type evolution
658 private var vars
= new HashMap[Variable, nullable MType]
660 # Adapt the variable to a static type
661 # Warning1: do not modify vars directly.
662 # Warning2: sub-flow may have cached a unadapted variable
663 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
665 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
666 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
667 self.vars
[variable
] = mtype
669 variable
.is_adapted
= true
670 #node.debug "set {variable} to {mtype or else "X"}"
673 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
674 private fun collect_types
(variable
: Variable): Array[nullable MType]
676 #node.debug "flow for {variable}"
677 var res
= new Array[nullable MType]
680 var seen
= new HashSet[FlowContext]
681 while not todo
.is_empty
do
683 if f
.is_unreachable
then continue
684 if seen
.has
(f
) then continue
687 if f
.vars
.has_key
(variable
) then
688 # Found something. Collect it and do not process further on this path
689 res
.add f
.vars
[variable
]
690 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
692 todo
.add_all f
.previous
694 if f
.previous
.is_empty
then
695 # Root flowcontext mean a parameter or something related
696 res
.add variable
.declared_type
697 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
701 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
707 # The entry point of the whole typing analysis
708 fun do_typing
(modelbuilder
: ModelBuilder)
712 # The variable associated to the receiver (if any)
713 var selfvariable
: nullable Variable
716 redef class AMethPropdef
717 redef fun do_typing
(modelbuilder
: ModelBuilder)
719 var nblock
= self.n_block
720 if nblock
== null then return
722 var mpropdef
= self.mpropdef
723 if mpropdef
== null then return # skip error
725 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
726 self.selfvariable
= v
.selfvariable
728 var mmethoddef
= self.mpropdef
.as(not null)
729 var msignature
= mmethoddef
.msignature
730 if msignature
== null then return # skip error
731 for i
in [0..msignature
.arity
[ do
732 var mtype
= msignature
.mparameters
[i
].mtype
733 if msignature
.vararg_rank
== i
then
734 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
735 if arrayclass
== null then return # Skip error
736 mtype
= arrayclass
.get_mtype
([mtype
])
738 var variable
= self.n_signature
.n_params
[i
].variable
739 assert variable
!= null
740 variable
.declared_type
= mtype
746 if not v
.has_loop
or not v
.dirty
then break
749 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
750 # We reach the end of the function without having a return, it is bad
751 v
.error
(self, "Error: reached end of function; expected `return` with a value.")
756 redef class AAttrPropdef
757 redef fun do_typing
(modelbuilder
: ModelBuilder)
759 if not has_value
then return
761 var mpropdef
= self.mpropdef
762 if mpropdef
== null then return # skip error
764 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
765 self.selfvariable
= v
.selfvariable
767 var nexpr
= self.n_expr
768 if nexpr
!= null then
769 var mtype
= self.mpropdef
.static_mtype
770 v
.visit_expr_subtype
(nexpr
, mtype
)
772 var nblock
= self.n_block
773 if nblock
!= null then
775 if not nblock
.after_flow_context
.is_unreachable
then
776 # We reach the end of the init without having a return, it is bad
777 v
.error
(self, "Error: reached end of block; expected `return`.")
786 # The static type of the expression.
787 # null if self is a statement or in case of error
788 var mtype
: nullable MType = null
790 # Is the statement correctly typed?
791 # Used to distinguish errors and statements when `mtype == null`
792 var is_typed
: Bool = false
794 # If required, the following implicit cast `.as(XXX)`
795 # Such a cast may by required after evaluating the expression when
796 # a unsafe operation is detected (silently accepted by the Nit language).
797 # The attribute is computed by `check_subtype`
798 var implicit_cast_to
: nullable MType = null
800 # Return the variable read (if any)
801 # Used to perform adaptive typing
802 fun its_variable
: nullable Variable do return null
804 private fun accept_typing
(v
: TypeVisitor)
806 v
.error
(self, "no implemented accept_typing for {self.class_name}")
809 # Is non-null if `self` is a leaf of a comprehension array construction.
810 # In this case, the enclosing literal array node is designated.
811 # The result of the evaluation of `self` must be
812 # stored inside the designated array (there is an implicit `push`)
813 var comprehension
: nullable AArrayExpr = null
816 redef class ABlockExpr
817 redef fun accept_typing
(v
)
819 for e
in self.n_expr
do v
.visit_stmt
(e
)
823 # The type of a blockexpr is the one of the last expression (or null if empty)
826 if self.n_expr
.is_empty
then return null
827 return self.n_expr
.last
.mtype
831 redef class AVardeclExpr
832 redef fun accept_typing
(v
)
834 var variable
= self.variable
835 if variable
== null then return # Skip error
837 var ntype
= self.n_type
838 var mtype
: nullable MType
839 if ntype
== null then
842 mtype
= v
.resolve_mtype
(ntype
)
843 if mtype
== null then return # Skip error
846 var nexpr
= self.n_expr
847 if nexpr
!= null then
848 if mtype
!= null then
849 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
850 if etype
== mtype
then
852 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
855 mtype
= v
.visit_expr
(nexpr
)
856 if mtype
== null then return # Skip error
861 if mtype
== null or mtype
isa MNullType then
862 var objclass
= v
.get_mclass
(self, "Object")
863 if objclass
== null then return # skip error
864 decltype
= objclass
.mclass_type
.as_nullable
865 if mtype
== null then mtype
= decltype
868 variable
.declared_type
= decltype
869 v
.set_variable
(self, variable
, mtype
)
871 #debug("var {variable}: {mtype}")
879 redef fun its_variable
do return self.variable
880 redef fun accept_typing
(v
)
882 var variable
= self.variable
883 if variable
== null then return # Skip error
885 var mtype
= v
.get_variable
(self, variable
)
886 if mtype
!= null then
887 #debug("{variable} is {mtype}")
889 #debug("{variable} is untyped")
896 redef class AVarAssignExpr
897 redef fun accept_typing
(v
)
899 var variable
= self.variable
900 assert variable
!= null
902 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
904 v
.set_variable
(self, variable
, mtype
)
910 redef class AReassignFormExpr
911 # The method designed by the reassign operator.
912 var reassign_callsite
: nullable CallSite
914 var read_type
: nullable MType = null
916 # Determine the `reassign_property`
917 # `readtype` is the type of the reading of the left value.
918 # `writetype` is the type of the writing of the left value.
919 # (Because of `ACallReassignExpr`, both can be different.
920 # Return the static type of the value to store.
921 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
923 var reassign_name
= self.n_assign_op
.operator
925 self.read_type
= readtype
927 var callsite
= v
.get_method
(self.n_assign_op
, readtype
, reassign_name
, false)
928 if callsite
== null then return null # Skip error
929 self.reassign_callsite
= callsite
931 var msignature
= callsite
.msignature
932 var rettype
= msignature
.return_mtype
933 assert msignature
.arity
== 1 and rettype
!= null
935 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
936 if value_type
== null then return null # Skip error
938 v
.check_subtype
(self, rettype
, writetype
, false)
943 redef class AVarReassignExpr
944 redef fun accept_typing
(v
)
946 var variable
= self.variable
947 assert variable
!= null
949 var readtype
= v
.get_variable
(self, variable
)
950 if readtype
== null then return
954 var writetype
= variable
.declared_type
955 if writetype
== null then return
957 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
959 v
.set_variable
(self, variable
, rettype
)
966 redef class AContinueExpr
967 redef fun accept_typing
(v
)
969 var nexpr
= self.n_expr
970 if nexpr
!= null then
977 redef class ABreakExpr
978 redef fun accept_typing
(v
)
980 var nexpr
= self.n_expr
981 if nexpr
!= null then
988 redef class AReturnExpr
989 redef fun accept_typing
(v
)
991 var nexpr
= self.n_expr
993 var mpropdef
= v
.mpropdef
994 if mpropdef
isa MMethodDef then
995 ret_type
= mpropdef
.msignature
.return_mtype
996 else if mpropdef
isa MAttributeDef then
997 ret_type
= mpropdef
.static_mtype
1001 if nexpr
!= null then
1002 if ret_type
!= null then
1003 v
.visit_expr_subtype
(nexpr
, ret_type
)
1006 v
.error
(nexpr
, "Error: `return` with value in a procedure.")
1008 else if ret_type
!= null then
1009 v
.error
(self, "Error: `return` without value in a function.")
1011 self.is_typed
= true
1015 redef class AAbortExpr
1016 redef fun accept_typing
(v
)
1018 self.is_typed
= true
1023 redef fun accept_typing
(v
)
1025 v
.visit_expr_bool
(n_expr
)
1027 v
.visit_stmt
(n_then
)
1028 v
.visit_stmt
(n_else
)
1030 self.is_typed
= true
1032 if n_then
!= null and n_else
== null then
1033 self.mtype
= n_then
.mtype
1038 redef class AIfexprExpr
1039 redef fun accept_typing
(v
)
1041 v
.visit_expr_bool
(n_expr
)
1043 var t1
= v
.visit_expr
(n_then
)
1044 var t2
= v
.visit_expr
(n_else
)
1046 if t1
== null or t2
== null then
1050 var t
= v
.merge_types
(self, [t1
, t2
])
1052 v
.error
(self, "Type Error: ambiguous type `{t1}` vs `{t2}`.")
1059 redef fun accept_typing
(v
)
1061 v
.visit_stmt
(n_block
)
1062 self.is_typed
= true
1066 redef class AWhileExpr
1067 redef fun accept_typing
(v
)
1070 v
.visit_expr_bool
(n_expr
)
1071 v
.visit_stmt
(n_block
)
1072 self.is_typed
= true
1076 redef class ALoopExpr
1077 redef fun accept_typing
(v
)
1080 v
.visit_stmt
(n_block
)
1081 self.is_typed
= true
1085 redef class AForExpr
1086 var coltype
: nullable MClassType
1088 var method_iterator
: nullable CallSite
1089 var method_is_ok
: nullable CallSite
1090 var method_item
: nullable CallSite
1091 var method_next
: nullable CallSite
1092 var method_key
: nullable CallSite
1093 var method_finish
: nullable CallSite
1095 var method_lt
: nullable CallSite
1096 var method_successor
: nullable CallSite
1098 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1100 if mtype
isa MNullType then
1101 v
.error
(self, "Type Error: `for` cannot iterate over `null`.")
1106 var objcla
= v
.get_mclass
(self, "Object")
1107 if objcla
== null then return
1109 # check iterator method
1110 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1111 if itdef
== null then
1112 v
.error
(self, "Type Error: `for` expects a type providing an `iterator` method, got `{mtype}`.")
1115 self.method_iterator
= itdef
1117 # check that iterator return something
1118 var ittype
= itdef
.msignature
.return_mtype
1119 if ittype
== null then
1120 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1125 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1126 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1130 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1132 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1133 var variables
= self.variables
1134 if variables
.length
!= 1 then
1135 v
.error
(self, "Type Error: `for` expects only one variable when using `Iterator`.")
1137 variables
.first
.declared_type
= coltype
.arguments
.first
1142 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1144 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1145 var variables
= self.variables
1146 if variables
.length
!= 2 then
1147 v
.error
(self, "Type Error: `for` expects two variables when using `MapIterator`.")
1149 variables
[0].declared_type
= coltype
.arguments
[0]
1150 variables
[1].declared_type
= coltype
.arguments
[1]
1155 if not is_col
and not is_map
then
1156 v
.error
(self, "Type Error: `for` expects the method `iterator` to return an `Iterator` or `MapIterator` type.")
1160 # anchor formal and virtual types
1161 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1163 mtype
= mtype
.undecorate
1164 self.coltype
= mtype
.as(MClassType)
1166 # get methods is_ok, next, item
1167 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1168 if ikdef
== null then
1169 v
.error
(self, "Type Error: `for` expects a method `is_ok` in type `{ittype}`.")
1172 self.method_is_ok
= ikdef
1174 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1175 if itemdef
== null then
1176 v
.error
(self, "Type Error: `for` expects a method `item` in type `{ittype}`.")
1179 self.method_item
= itemdef
1181 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1182 if nextdef
== null then
1183 v
.error
(self, "Type Error: `for` expects a method `next` in type {ittype}.")
1186 self.method_next
= nextdef
1188 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1191 var keydef
= v
.get_method
(self, ittype
, "key", false)
1192 if keydef
== null then
1193 v
.error
(self, "Type Error: `for` expects a method `key` in type `{ittype}`.")
1196 self.method_key
= keydef
1199 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1200 var variable
= variables
.first
1201 var vtype
= variable
.declared_type
.as(not null)
1203 if n_expr
isa AOrangeExpr then
1204 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1206 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1209 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1213 redef fun accept_typing
(v
)
1216 var mtype
= v
.visit_expr
(n_expr
)
1217 if mtype
== null then return
1219 self.do_type_iterator
(v
, mtype
)
1221 v
.visit_stmt
(n_block
)
1223 self.mtype
= n_block
.mtype
1224 self.is_typed
= true
1228 redef class AWithExpr
1229 var method_start
: nullable CallSite
1230 var method_finish
: nullable CallSite
1232 redef fun accept_typing
(v
: TypeVisitor)
1234 var mtype
= v
.visit_expr
(n_expr
)
1235 if mtype
== null then return
1237 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1238 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1240 v
.visit_stmt
(n_block
)
1241 self.mtype
= n_block
.mtype
1242 self.is_typed
= true
1246 redef class AAssertExpr
1247 redef fun accept_typing
(v
)
1249 v
.visit_expr_bool
(n_expr
)
1251 v
.visit_stmt
(n_else
)
1252 self.is_typed
= true
1257 redef fun accept_typing
(v
)
1259 v
.visit_expr_bool
(n_expr
)
1260 v
.visit_expr_bool
(n_expr2
)
1261 self.mtype
= v
.type_bool
(self)
1265 redef class AImpliesExpr
1266 redef fun accept_typing
(v
)
1268 v
.visit_expr_bool
(n_expr
)
1269 v
.visit_expr_bool
(n_expr2
)
1270 self.mtype
= v
.type_bool
(self)
1274 redef class AAndExpr
1275 redef fun accept_typing
(v
)
1277 v
.visit_expr_bool
(n_expr
)
1278 v
.visit_expr_bool
(n_expr2
)
1279 self.mtype
= v
.type_bool
(self)
1284 redef class ANotExpr
1285 redef fun accept_typing
(v
)
1287 v
.visit_expr_bool
(n_expr
)
1288 self.mtype
= v
.type_bool
(self)
1292 redef class AOrElseExpr
1293 redef fun accept_typing
(v
)
1295 var t1
= v
.visit_expr
(n_expr
)
1296 var t2
= v
.visit_expr
(n_expr2
)
1298 if t1
== null or t2
== null then
1302 if t1
isa MNullType then
1303 v
.error
(n_expr
, "Type Error: `or else` on `null`.")
1304 else if v
.check_can_be_null
(n_expr
, t1
) then
1308 var t
= v
.merge_types
(self, [t1
, t2
])
1310 var c
= v
.get_mclass
(self, "Object")
1311 if c
== null then return # forward error
1313 if v
.can_be_null
(t2
) then
1316 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1322 redef class ATrueExpr
1323 redef fun accept_typing
(v
)
1325 self.mtype
= v
.type_bool
(self)
1329 redef class AFalseExpr
1330 redef fun accept_typing
(v
)
1332 self.mtype
= v
.type_bool
(self)
1336 redef class AIntExpr
1337 redef fun accept_typing
(v
)
1339 var mclass
= v
.get_mclass
(self, "Int")
1340 if mclass
== null then return # Forward error
1341 self.mtype
= mclass
.mclass_type
1345 redef class AFloatExpr
1346 redef fun accept_typing
(v
)
1348 var mclass
= v
.get_mclass
(self, "Float")
1349 if mclass
== null then return # Forward error
1350 self.mtype
= mclass
.mclass_type
1354 redef class ACharExpr
1355 redef fun accept_typing
(v
)
1357 var mclass
= v
.get_mclass
(self, "Char")
1358 if mclass
== null then return # Forward error
1359 self.mtype
= mclass
.mclass_type
1363 redef class AStringFormExpr
1364 redef fun accept_typing
(v
)
1366 var mclass
= v
.get_mclass
(self, "String")
1367 if mclass
== null then return # Forward error
1368 self.mtype
= mclass
.mclass_type
1372 redef class ASuperstringExpr
1373 redef fun accept_typing
(v
)
1375 var mclass
= v
.get_mclass
(self, "String")
1376 if mclass
== null then return # Forward error
1377 self.mtype
= mclass
.mclass_type
1378 var objclass
= v
.get_mclass
(self, "Object")
1379 if objclass
== null then return # Forward error
1380 var objtype
= objclass
.mclass_type
1381 for nexpr
in self.n_exprs
do
1382 v
.visit_expr_subtype
(nexpr
, objtype
)
1387 redef class AArrayExpr
1388 # The `with_capacity` method on Array
1389 var with_capacity_callsite
: nullable CallSite
1391 # The `push` method on arrays
1392 var push_callsite
: nullable CallSite
1394 # The element of each type
1395 var element_mtype
: nullable MType
1397 # Set that `self` is a part of comprehension array `na`
1398 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1399 private fun set_comprehension
(n
: nullable AExpr)
1403 else if n
isa AForExpr then
1404 set_comprehension
(n
.n_block
)
1405 else if n
isa AIfExpr then
1406 set_comprehension
(n
.n_then
)
1407 set_comprehension
(n
.n_else
)
1410 n
.comprehension
= self
1413 redef fun accept_typing
(v
)
1415 var mtype
: nullable MType = null
1416 var ntype
= self.n_type
1417 if ntype
!= null then
1418 mtype
= v
.resolve_mtype
(ntype
)
1419 if mtype
== null then return # Skip error
1421 var mtypes
= new Array[nullable MType]
1423 for e
in self.n_exprs
do
1424 var t
= v
.visit_expr
(e
)
1428 set_comprehension
(e
)
1429 if mtype
!= null then
1430 if v
.check_subtype
(e
, t
, mtype
, false) == null then return # Forward error
1431 if t
== mtype
then useless
= true
1436 if mtype
== null then
1437 # Ensure monotony for type adaptation on loops
1438 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1439 mtype
= v
.merge_types
(self, mtypes
)
1441 if mtype
== null or mtype
isa MNullType then
1442 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1446 assert ntype
!= null
1447 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1450 self.element_mtype
= mtype
1452 var mclass
= v
.get_mclass
(self, "Array")
1453 if mclass
== null then return # Forward error
1454 var array_mtype
= mclass
.get_mtype
([mtype
])
1456 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1457 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1459 self.mtype
= array_mtype
1463 redef class ARangeExpr
1464 var init_callsite
: nullable CallSite
1466 redef fun accept_typing
(v
)
1468 var discrete_class
= v
.get_mclass
(self, "Discrete")
1469 if discrete_class
== null then return # Forward error
1470 var discrete_type
= discrete_class
.intro
.bound_mtype
1471 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1472 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1473 if t1
== null or t2
== null then return
1474 var mclass
= v
.get_mclass
(self, "Range")
1475 if mclass
== null then return # Forward error
1477 if v
.is_subtype
(t1
, t2
) then
1478 mtype
= mclass
.get_mtype
([t2
])
1479 else if v
.is_subtype
(t2
, t1
) then
1480 mtype
= mclass
.get_mtype
([t1
])
1482 v
.error
(self, "Type Error: cannot create range: `{t1}` vs `{t2}`.")
1488 # get the constructor
1490 if self isa ACrangeExpr then
1491 callsite
= v
.get_method
(self, mtype
, "init", false)
1492 else if self isa AOrangeExpr then
1493 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1497 init_callsite
= callsite
1501 redef class ANullExpr
1502 redef fun accept_typing
(v
)
1504 self.mtype
= v
.mmodule
.model
.null_type
1508 redef class AIsaExpr
1509 # The static type to cast to.
1510 # (different from the static type of the expression that is `Bool`).
1511 var cast_type
: nullable MType
1512 redef fun accept_typing
(v
)
1514 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1515 self.cast_type
= mtype
1517 var variable
= self.n_expr
.its_variable
1518 if variable
!= null then
1519 #var orig = self.n_expr.mtype
1520 #var from = if orig != null then orig.to_s else "invalid"
1521 #var to = if mtype != null then mtype.to_s else "invalid"
1522 #debug("adapt {variable}: {from} -> {to}")
1523 self.after_flow_context
.when_true
.set_var
(v
, variable
, mtype
)
1526 self.mtype
= v
.type_bool
(self)
1530 redef class AAsCastExpr
1531 redef fun accept_typing
(v
)
1533 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1537 redef class AAsNotnullExpr
1538 redef fun accept_typing
(v
)
1540 var mtype
= v
.visit_expr
(self.n_expr
)
1541 if mtype
== null then return # Forward error
1543 if mtype
isa MNullType then
1544 v
.error
(self, "Type Error: `as(not null)` on `null`.")
1548 if v
.check_can_be_null
(n_expr
, mtype
) then
1549 mtype
= mtype
.as_notnull
1556 redef class AParExpr
1557 redef fun accept_typing
(v
)
1559 self.mtype
= v
.visit_expr
(self.n_expr
)
1563 redef class AOnceExpr
1564 redef fun accept_typing
(v
)
1566 self.mtype
= v
.visit_expr
(self.n_expr
)
1570 redef class ASelfExpr
1571 redef var its_variable
: nullable Variable
1572 redef fun accept_typing
(v
)
1574 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1575 v
.error
(self, "Error: `self` cannot be used in top-level method.")
1577 var variable
= v
.selfvariable
1578 self.its_variable
= variable
1579 self.mtype
= v
.get_variable
(self, variable
)
1583 redef class AImplicitSelfExpr
1584 # Is the implicit receiver `sys`?
1586 # By default, the implicit receiver is `self`.
1587 # But when there is not method for `self`, `sys` is used as a fall-back.
1588 # Is this case this flag is set to `true`.
1592 ## MESSAGE SENDING AND PROPERTY
1594 redef class ASendExpr
1595 # The property invoked by the send.
1596 var callsite
: nullable CallSite
1598 redef fun accept_typing
(v
)
1600 var nrecv
= self.n_expr
1601 var recvtype
= v
.visit_expr
(nrecv
)
1602 var name
= self.property_name
1603 var node
= self.property_node
1605 if recvtype
== null then return # Forward error
1608 var unsafe_type
= v
.anchor_to
(recvtype
)
1609 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
1610 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1611 # Special fall-back search in `sys` when noting found in the implicit receiver.
1612 var sysclass
= v
.try_get_mclass
(node
, "Sys")
1613 if sysclass
!= null then
1614 var systype
= sysclass
.mclass_type
1615 mproperty
= v
.try_get_mproperty_by_name2
(node
, systype
, name
)
1616 if mproperty
!= null then
1617 callsite
= v
.get_method
(node
, systype
, name
, false)
1618 if callsite
== null then return # Forward error
1619 # Update information, we are looking at `sys` now, not `self`
1621 nrecv
.its_variable
= null
1622 nrecv
.mtype
= systype
1627 if callsite
== null then
1628 # If still nothing, just exit
1629 callsite
= v
.get_method
(node
, recvtype
, name
, nrecv
isa ASelfExpr)
1630 if callsite
== null then return
1633 self.callsite
= callsite
1634 var msignature
= callsite
.msignature
1636 var args
= compute_raw_arguments
1638 callsite
.check_signature
(v
, args
)
1640 if callsite
.mproperty
.is_init
then
1641 var vmpropdef
= v
.mpropdef
1642 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1643 v
.error
(node
, "Error: an `init` can only be called from another `init`.")
1645 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1646 v
.error
(node
, "Error: `{vmpropdef}` cannot call a factory `{callsite.mproperty}`.")
1650 var ret
= msignature
.return_mtype
1654 self.is_typed
= true
1658 # The name of the property
1659 # Each subclass simply provide the correct name.
1660 private fun property_name
: String is abstract
1662 # The node identifying the name (id, operator, etc) for messages.
1664 # Is `self` by default
1665 private fun property_node
: ANode do return self
1667 # An array of all arguments (excluding self)
1668 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1670 private fun compute_raw_arguments
: Array[AExpr] is abstract
1673 redef class ABinopExpr
1674 redef fun compute_raw_arguments
do return [n_expr2
]
1675 redef fun property_name
do return operator
1676 redef fun property_node
do return n_op
1679 redef fun accept_typing
(v
)
1686 redef fun accept_typing
(v
)
1693 redef class AUnaryopExpr
1694 redef fun property_name
do return "unary {operator}"
1695 redef fun compute_raw_arguments
do return new Array[AExpr]
1699 redef class ACallExpr
1700 redef fun property_name
do return n_id
.text
1701 redef fun property_node
do return n_id
1702 redef fun compute_raw_arguments
do return n_args
.to_a
1705 redef class ACallAssignExpr
1706 redef fun property_name
do return n_id
.text
+ "="
1707 redef fun property_node
do return n_id
1708 redef fun compute_raw_arguments
1710 var res
= n_args
.to_a
1716 redef class ABraExpr
1717 redef fun property_name
do return "[]"
1718 redef fun compute_raw_arguments
do return n_args
.to_a
1721 redef class ABraAssignExpr
1722 redef fun property_name
do return "[]="
1723 redef fun compute_raw_arguments
1725 var res
= n_args
.to_a
1731 redef class ASendReassignFormExpr
1732 # The property invoked for the writing
1733 var write_callsite
: nullable CallSite
1735 redef fun accept_typing
(v
)
1737 var recvtype
= v
.visit_expr
(self.n_expr
)
1738 var name
= self.property_name
1739 var node
= self.property_node
1741 if recvtype
== null then return # Forward error
1743 var for_self
= self.n_expr
isa ASelfExpr
1744 var callsite
= v
.get_method
(node
, recvtype
, name
, for_self
)
1746 if callsite
== null then return
1747 self.callsite
= callsite
1749 var args
= compute_raw_arguments
1751 callsite
.check_signature
(v
, args
)
1753 var readtype
= callsite
.msignature
.return_mtype
1754 if readtype
== null then
1755 v
.error
(node
, "Error: `{name}` is not a function.")
1759 var wcallsite
= v
.get_method
(node
, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1760 if wcallsite
== null then return
1761 self.write_callsite
= wcallsite
1763 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1764 if wtype
== null then return
1766 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1767 args
.add
(self.n_value
)
1768 wcallsite
.check_signature
(v
, args
)
1770 self.is_typed
= true
1774 redef class ACallReassignExpr
1775 redef fun property_name
do return n_id
.text
1776 redef fun property_node
do return n_id
1777 redef fun compute_raw_arguments
do return n_args
.to_a
1780 redef class ABraReassignExpr
1781 redef fun property_name
do return "[]"
1782 redef fun compute_raw_arguments
do return n_args
.to_a
1785 redef class AInitExpr
1786 redef fun property_name
do return "init"
1787 redef fun property_node
do return n_kwinit
1788 redef fun compute_raw_arguments
do return n_args
.to_a
1792 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1797 redef class ASuperExpr
1798 # The method to call if the super is in fact a 'super init call'
1799 # Note: if the super is a normal call-next-method, then this attribute is null
1800 var callsite
: nullable CallSite
1802 # The method to call is the super is a standard `call-next-method` super-call
1803 # Note: if the super is a special super-init-call, then this attribute is null
1804 var mpropdef
: nullable MMethodDef
1806 redef fun accept_typing
(v
)
1808 var anchor
= v
.anchor
1809 assert anchor
!= null
1810 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1811 assert recvtype
!= null
1812 var mproperty
= v
.mpropdef
.mproperty
1813 if not mproperty
isa MMethod then
1814 v
.error
(self, "Error: `super` only usable in a `method`.")
1817 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1818 if superprops
.length
== 0 then
1819 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1820 process_superinit
(v
)
1823 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
1826 # FIXME: covariance of return type in linear extension?
1827 var superprop
= superprops
.first
1829 var msignature
= superprop
.msignature
.as(not null)
1830 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1831 var args
= self.n_args
.to_a
1832 if args
.length
> 0 then
1833 signaturemap
= v
.check_signature
(self, args
, mproperty
, msignature
)
1835 self.mtype
= msignature
.return_mtype
1836 self.is_typed
= true
1837 v
.mpropdef
.has_supercall
= true
1838 mpropdef
= v
.mpropdef
.as(MMethodDef)
1841 # The mapping used on the call to associate arguments to parameters.
1842 # If null then no specific association is required.
1843 var signaturemap
: nullable SignatureMap
1845 private fun process_superinit
(v
: TypeVisitor)
1847 var anchor
= v
.anchor
1848 assert anchor
!= null
1849 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1850 assert recvtype
!= null
1851 var mpropdef
= v
.mpropdef
1852 assert mpropdef
isa MMethodDef
1853 var mproperty
= mpropdef
.mproperty
1854 var superprop
: nullable MMethodDef = null
1855 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1856 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1857 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1858 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1859 if candidate
== null then
1860 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1861 continue # Try next super-class
1863 if superprop
!= null and candidate
.is_root_init
then
1866 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1867 v
.error
(self, "Error: conflicting super constructor to call for `{mproperty}`: `{candidate.full_name}`, `{superprop.mproperty.full_name}`")
1870 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1871 if superprop
!= null and superprop
.mproperty
== candidate
then
1872 if superprop
== candidatedefs
.first
then continue
1873 candidatedefs
.add
(superprop
)
1875 if candidatedefs
.length
> 1 then
1876 v
.error
(self, "Error: conflicting property definitions for property `{mproperty}` in `{recvtype}`: {candidatedefs.join(", ")}")
1879 superprop
= candidatedefs
.first
1881 if superprop
== null then
1882 v
.error
(self, "Error: no super method to call for `{mproperty}`.")
1886 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1887 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1889 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1890 self.callsite
= callsite
1892 var args
= self.n_args
.to_a
1893 if args
.length
> 0 then
1894 callsite
.check_signature
(v
, args
)
1896 # Check there is at least enough parameters
1897 if mpropdef
.msignature
.arity
< msignature
.arity
then
1898 v
.error
(self, "Error: not enough implicit arguments to pass. Got `{mpropdef.msignature.arity}`, expected at least `{msignature.arity}`. Signature is `{msignature}`.")
1901 # Check that each needed parameter is conform
1903 for sp
in msignature
.mparameters
do
1904 var p
= mpropdef
.msignature
.mparameters
[i
]
1905 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1906 v
.error
(self, "Type Error: expected argument #{i} of type `{sp.mtype}`, got implicit argument `{p.name}` of type `{p.mtype}`. Signature is {msignature}")
1913 self.is_typed
= true
1919 redef class ANewExpr
1920 # The constructor invoked by the new.
1921 var callsite
: nullable CallSite
1923 # The designated type
1924 var recvtype
: nullable MClassType
1926 redef fun accept_typing
(v
)
1928 var recvtype
= v
.resolve_mtype
(self.n_type
)
1929 if recvtype
== null then return
1931 if not recvtype
isa MClassType then
1932 if recvtype
isa MNullableType then
1933 v
.error
(self, "Type Error: cannot instantiate the nullable type `{recvtype}`.")
1935 else if recvtype
isa MFormalType then
1936 v
.error
(self, "Type Error: cannot instantiate the formal type `{recvtype}`.")
1939 v
.error
(self, "Type Error: cannot instantiate the type `{recvtype}`.")
1944 self.recvtype
= recvtype
1945 var kind
= recvtype
.mclass
.kind
1957 if name
== "intern" then
1958 if kind
!= concrete_kind
then
1959 v
.error
(self, "Type Error: cannot instantiate {kind} {recvtype}.")
1962 if n_args
.n_exprs
.not_empty
then
1963 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
1967 self.mtype
= recvtype
1971 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
1972 if callsite
== null then return
1974 if not callsite
.mproperty
.is_new
then
1975 if kind
!= concrete_kind
then
1976 v
.error
(self, "Type Error: cannot instantiate {kind} `{recvtype}`.")
1979 self.mtype
= recvtype
1981 self.mtype
= callsite
.msignature
.return_mtype
1982 assert self.mtype
!= null
1985 self.callsite
= callsite
1987 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1988 v
.error
(self, "Error: `{name}` is not a constructor.")
1992 var args
= n_args
.to_a
1993 callsite
.check_signature
(v
, args
)
1999 redef class AAttrFormExpr
2000 # The attribute accessed.
2001 var mproperty
: nullable MAttribute
2003 # The static type of the attribute.
2004 var attr_type
: nullable MType
2006 # Resolve the attribute accessed.
2007 private fun resolve_property
(v
: TypeVisitor)
2009 var recvtype
= v
.visit_expr
(self.n_expr
)
2010 if recvtype
== null then return # Skip error
2011 var node
= self.n_id
2012 var name
= node
.text
2013 if recvtype
isa MNullType then
2014 v
.error
(node
, "Error: attribute `{name}` access on `null`.")
2018 var unsafe_type
= v
.anchor_to
(recvtype
)
2019 var mproperty
= v
.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
2020 if mproperty
== null then
2021 v
.modelbuilder
.error
(node
, "Error: attribute `{name}` does not exist in `{recvtype}`.")
2024 assert mproperty
isa MAttribute
2025 self.mproperty
= mproperty
2027 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
2028 assert mpropdefs
.length
== 1
2029 var mpropdef
= mpropdefs
.first
2030 var attr_type
= mpropdef
.static_mtype
2031 if attr_type
== null then return # skip error
2032 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
2033 self.attr_type
= attr_type
2037 redef class AAttrExpr
2038 redef fun accept_typing
(v
)
2040 self.resolve_property
(v
)
2041 self.mtype
= self.attr_type
2046 redef class AAttrAssignExpr
2047 redef fun accept_typing
(v
)
2049 self.resolve_property
(v
)
2050 var mtype
= self.attr_type
2052 v
.visit_expr_subtype
(self.n_value
, mtype
)
2053 self.is_typed
= true
2057 redef class AAttrReassignExpr
2058 redef fun accept_typing
(v
)
2060 self.resolve_property
(v
)
2061 var mtype
= self.attr_type
2062 if mtype
== null then return # Skip error
2064 self.resolve_reassignment
(v
, mtype
, mtype
)
2066 self.is_typed
= true
2070 redef class AIssetAttrExpr
2071 redef fun accept_typing
(v
)
2073 self.resolve_property
(v
)
2074 var mtype
= self.attr_type
2075 if mtype
== null then return # Skip error
2077 var recvtype
= self.n_expr
.mtype
.as(not null)
2078 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2079 if bound
isa MNullableType then
2080 v
.error
(n_id
, "Type Error: `isset` on a nullable attribute.")
2082 self.mtype
= v
.type_bool
(self)
2086 redef class AVarargExpr
2087 redef fun accept_typing
(v
)
2089 # This kind of pseudo-expression can be only processed trough a signature
2090 # See `check_signature`
2091 # Other cases are a syntax error.
2092 v
.error
(self, "Syntax Error: unexpected `...`.")
2098 redef class ADebugTypeExpr
2099 redef fun accept_typing
(v
)
2101 var expr
= v
.visit_expr
(self.n_expr
)
2102 if expr
== null then return
2103 var unsafe
= v
.anchor_to
(expr
)
2104 var ntype
= self.n_type
2105 var mtype
= v
.resolve_mtype
(ntype
)
2106 if mtype
!= null and mtype
!= expr
then
2107 var umtype
= v
.anchor_to
(mtype
)
2108 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2110 self.is_typed
= true