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 var is_toplevel_context
= false
59 var mpropdef
= self.mpropdef
61 if mpropdef
!= null then
62 self.mpropdef
= mpropdef
63 var mclassdef
= mpropdef
.mclassdef
64 self.mclassdef
= mclassdef
65 self.anchor
= mclassdef
.bound_mtype
67 var mclass
= mclassdef
.mclass
69 var selfvariable
= new Variable("self")
70 self.selfvariable
= selfvariable
71 selfvariable
.declared_type
= mclass
.mclass_type
73 var mprop
= mpropdef
.mproperty
74 if mprop
isa MMethod and (mprop
.is_toplevel
or mprop
.is_new
) then
75 is_toplevel_context
= true
80 fun anchor_to
(mtype
: MType): MType
83 if anchor
== null then
84 assert not mtype
.need_anchor
87 return mtype
.anchor_to
(mmodule
, anchor
)
90 fun is_subtype
(sub
, sup
: MType): Bool
92 return sub
.is_subtype
(mmodule
, anchor
, sup
)
95 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
97 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
98 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
102 # Check that `sub` is a subtype of `sup`.
103 # If `sub` is not a valid suptype, then display an error on `node` an return null.
104 # If `sub` is a safe subtype of `sup` then return `sub`.
105 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
107 # The point of the return type is to determinate the usable type on an expression:
108 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
109 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
110 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
112 if self.is_subtype
(sub
, sup
) then return sub
113 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
114 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
115 #node.debug("Unsafe typing: expected {sup}, got {sub}")
118 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
122 # Visit an expression and do not care about the return value
123 fun visit_stmt
(nexpr
: nullable AExpr)
125 if nexpr
== null then return
126 nexpr
.accept_typing
(self)
129 # Visit an expression and expects that it is not a statement
130 # Return the type of the expression
131 # Display an error and return null if:
132 # * the type cannot be determined or
133 # * `nexpr` is a statement
134 fun visit_expr
(nexpr
: AExpr): nullable MType
136 nexpr
.accept_typing
(self)
137 var mtype
= nexpr
.mtype
138 if mtype
!= null then return mtype
139 if not nexpr
.is_typed
then
140 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
141 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
142 nexpr
.debug
("No return type but no error.")
145 return null # forward error
147 self.error
(nexpr
, "Type error: expected expression.")
151 # Visit an expression and expect its static type is a least a `sup`
152 # Return the type of the expression or null if
153 # * the type cannot be determined or
154 # * `nexpr` is a statement or
155 # * `nexpr` is not a `sup`
156 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
158 var sub
= visit_expr
(nexpr
)
159 if sub
== null then return null # Forward error
161 if sup
== null then return null # Forward error
163 var res
= check_subtype
(nexpr
, sub
, sup
)
165 nexpr
.implicit_cast_to
= res
170 # Visit an expression and expect its static type is a `Bool`
171 # Return the type of the expression or null if
172 # * the type cannot be determined or
173 # * `nexpr` is a statement or
174 # * `nexpr` is not a `Bool`
175 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
177 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
181 fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
183 var sub
= visit_expr
(nexpr
)
184 if sub
== null then return null # Forward error
186 var sup
= self.resolve_mtype
(ntype
)
187 if sup
== null then return null # Forward error
190 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup}.")
191 else if self.is_subtype
(sub
, sup
) then
192 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup} since it is a {sub}.")
197 # Can `mtype` be null (up to the current knowledge)?
198 fun can_be_null
(mtype
: MType): Bool
200 if mtype
isa MNullableType or mtype
isa MNullType then return true
201 if mtype
isa MFormalType then
202 var x
= anchor_to
(mtype
)
203 if x
isa MNullableType or x
isa MNullType then return true
208 # Check that `mtype` can be null (up to the current knowledge).
210 # If not then display a `useless-null-test` warning on node and return false.
212 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
214 if can_be_null
(mtype
) then return true
216 if mtype
isa MFormalType then
217 var res
= anchor_to
(mtype
)
218 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
220 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
225 # Special verification on != and == for null
227 fun null_test
(anode
: ABinopExpr)
229 var mtype
= anode
.n_expr
.mtype
230 var mtype2
= anode
.n_expr2
.mtype
232 if mtype
== null or mtype2
== null then return
234 if not mtype2
isa MNullType then return
236 if mtype
isa MNullType then return
238 # Check of useless null
239 if not check_can_be_null
(anode
.n_expr
, mtype
) then return
241 mtype
= mtype
.as_notnull
243 # Check for type adaptation
244 var variable
= anode
.n_expr
.its_variable
245 if variable
== null then return
247 # One is null (mtype2 see above) the other is not null
248 if anode
isa AEqExpr then
249 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
250 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
)
251 else if anode
isa ANeExpr then
252 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
253 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
)
259 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
261 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
264 fun resolve_mtype
(node
: AType): nullable MType
266 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
269 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
271 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
275 fun get_mclass
(node
: ANode, name
: String): nullable MClass
277 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
278 if mclass
== null then
279 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
284 fun type_bool
(node
: ANode): nullable MType
286 var mclass
= self.get_mclass
(node
, "Bool")
287 if mclass
== null then return null
288 return mclass
.mclass_type
291 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
293 var unsafe_type
= self.anchor_to
(recvtype
)
295 #debug("recv: {recvtype} (aka {unsafe_type})")
296 if recvtype
isa MNullType then
297 # `null` only accepts some methods of object.
298 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
299 unsafe_type
= mmodule
.object_type
.as_nullable
301 self.error
(node
, "Error: Method '{name}' call on 'null'.")
306 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
307 if name
== "new" and mproperty
== null then
309 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
312 if mproperty
== null then
313 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
315 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
317 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
322 assert mproperty
isa MMethod
324 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
325 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
327 if not recv_is_self
and mproperty
.is_toplevel
then
328 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
331 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
332 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
336 var info
= mproperty
.deprecation
337 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
340 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
342 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
346 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
348 if propdefs
.length
== 0 then
349 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
351 else if propdefs
.length
== 1 then
352 mpropdef
= propdefs
.first
354 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
355 mpropdef
= mproperty
.intro
359 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
360 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
362 var erasure_cast
= false
363 var rettype
= mpropdef
.msignature
.return_mtype
364 if not recv_is_self
and rettype
!= null then
365 rettype
= rettype
.undecorate
366 if rettype
isa MParameterType then
367 var erased_rettype
= msignature
.return_mtype
368 assert erased_rettype
!= null
369 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
374 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
378 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
380 var unsafe_type
= self.anchor_to
(recvtype
)
381 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
382 if mproperty
== null then return null
383 return get_method
(node
, recvtype
, name
, recv_is_self
)
387 # Visit the expressions of args and check their conformity with the corresponding type in signature
388 # The point of this method is to handle varargs correctly
389 # Note: The signature must be correctly adapted
390 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
392 var vararg_rank
= msignature
.vararg_rank
393 if vararg_rank
>= 0 then
394 if args
.length
< msignature
.arity
then
395 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
396 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
399 else if args
.length
!= msignature
.arity
then
400 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
404 #debug("CALL {unsafe_type}.{msignature}")
406 var vararg_decl
= args
.length
- msignature
.arity
407 for i
in [0..msignature
.arity
[ do
409 if i
== vararg_rank
then continue # skip the vararg
410 if i
> vararg_rank
then
413 var paramtype
= msignature
.mparameters
[i
].mtype
414 self.visit_expr_subtype
(args
[j
], paramtype
)
416 if vararg_rank
>= 0 then
417 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
418 var first
= args
[vararg_rank
]
419 if vararg_decl
== 0 and first
isa AVarargExpr then
420 var mclass
= get_mclass
(node
, "Array")
421 if mclass
== null then return false # Forward error
422 var array_mtype
= mclass
.get_mtype
([paramtype
])
423 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
424 first
.mtype
= first
.n_expr
.mtype
426 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
427 self.visit_expr_subtype
(args
[j
], paramtype
)
434 fun error
(node
: ANode, message
: String)
436 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
439 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
441 var flow
= node
.after_flow_context
443 self.error
(node
, "No context!")
447 if flow
.vars
.has_key
(variable
) then
448 return flow
.vars
[variable
]
450 #node.debug("*** START Collected for {variable}")
451 var mtypes
= flow
.collect_types
(variable
)
452 #node.debug("**** END Collected for {variable}")
453 if mtypes
== null or mtypes
.length
== 0 then
454 return variable
.declared_type
455 else if mtypes
.length
== 1 then
458 var res
= merge_types
(node
,mtypes
)
459 if res
== null then res
= variable
.declared_type
465 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
467 var flow
= node
.after_flow_context
470 flow
.set_var
(variable
, mtype
)
473 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
475 if col
.length
== 1 then return col
.first
477 if t1
== null then continue # return null
480 if t2
== null then continue # return null
481 if can_be_null
(t2
) and not can_be_null
(t1
) then
484 if not is_subtype
(t2
, t1
) then found
= false
487 #print "merge {col.join(" ")} -> {t1}"
491 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
496 # A specific method call site with its associated informations.
498 # The associated node for location
501 # The static type of the receiver (possibly unresolved)
504 # The module where the callsite is present
507 # The anchor to use with `recv` or `msignature`
508 var anchor
: nullable MClassType
510 # Is the receiver self?
511 # If "for_self", virtual types of the signature are kept
512 # If "not_for_self", virtual type are erased
513 var recv_is_self
: Bool
515 # The designated method
516 var mproperty
: MMethod
518 # The statically designated method definition
519 # The most specif one, it is.
520 var mpropdef
: MMethodDef
522 # The resolved signature for the receiver
523 var msignature
: MSignature
525 # Is a implicit cast required on erasure typing policy?
526 var erasure_cast
: Bool
528 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
530 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
535 # The declared type of the variable
536 var declared_type
: nullable MType
539 redef class FlowContext
540 # Store changes of types because of type evolution
541 private var vars
= new HashMap[Variable, nullable MType]
542 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
544 # Adapt the variable to a static type
545 # Warning1: do not modify vars directly.
546 # Warning2: sub-flow may have cached a unadapted variable
547 private fun set_var
(variable
: Variable, mtype
: nullable MType)
549 self.vars
[variable
] = mtype
550 self.cache
.keys
.remove
(variable
)
553 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
555 if cache
.has_key
(variable
) then
556 return cache
[variable
]
558 var res
: nullable Array[nullable MType] = null
559 if vars
.has_key
(variable
) then
560 var mtype
= vars
[variable
]
562 else if self.previous
.is_empty
then
564 res
= [variable
.declared_type
]
566 for flow
in self.previous
do
567 if flow
.is_unreachable
then continue
568 var r2
= flow
.collect_types
(variable
)
569 if r2
== null then continue
574 if not res
.has
(t
) then res
.add
(t
)
579 cache
[variable
] = res
585 # The entry point of the whole typing analysis
586 fun do_typing
(modelbuilder
: ModelBuilder)
590 # The variable associated to the receiver (if any)
591 var selfvariable
: nullable Variable
594 redef class AMethPropdef
595 redef fun do_typing
(modelbuilder
: ModelBuilder)
597 var nblock
= self.n_block
598 if nblock
== null then return
600 var mpropdef
= self.mpropdef
.as(not null)
601 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
602 self.selfvariable
= v
.selfvariable
604 var mmethoddef
= self.mpropdef
.as(not null)
605 for i
in [0..mmethoddef
.msignature
.arity
[ do
606 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
607 if mmethoddef
.msignature
.vararg_rank
== i
then
608 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
609 if arrayclass
== null then return # Skip error
610 mtype
= arrayclass
.get_mtype
([mtype
])
612 var variable
= self.n_signature
.n_params
[i
].variable
613 assert variable
!= null
614 variable
.declared_type
= mtype
618 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
619 # We reach the end of the function without having a return, it is bad
620 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
625 redef class AAttrPropdef
626 redef fun do_typing
(modelbuilder
: ModelBuilder)
628 if not has_value
then return
630 var mpropdef
= self.mpropdef
.as(not null)
631 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
632 self.selfvariable
= v
.selfvariable
634 var nexpr
= self.n_expr
635 if nexpr
!= null then
636 var mtype
= self.mpropdef
.static_mtype
637 v
.visit_expr_subtype
(nexpr
, mtype
)
639 var nblock
= self.n_block
640 if nblock
!= null then
642 if not nblock
.after_flow_context
.is_unreachable
then
643 # We reach the end of the init without having a return, it is bad
644 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
653 # The static type of the expression.
654 # null if self is a statement or in case of error
655 var mtype
: nullable MType = null
657 # Is the statement correctly typed?
658 # Used to distinguish errors and statements when `mtype == null`
659 var is_typed
: Bool = false
661 # If required, the following implicit cast `.as(XXX)`
662 # Such a cast may by required after evaluating the expression when
663 # a unsafe operation is detected (silently accepted by the Nit language).
664 # The attribute is computed by `check_subtype`
665 var implicit_cast_to
: nullable MType = null
667 # Return the variable read (if any)
668 # Used to perform adaptive typing
669 fun its_variable
: nullable Variable do return null
671 private fun accept_typing
(v
: TypeVisitor)
673 v
.error
(self, "no implemented accept_typing for {self.class_name}")
676 # Is non-null if `self` is a leaf of a comprehension array construction.
677 # In this case, the enclosing literal array node is designated.
678 # The result of the evaluation of `self` must be
679 # stored inside the designated array (there is an implicit `push`)
680 var comprehension
: nullable AArrayExpr = null
683 redef class ABlockExpr
684 redef fun accept_typing
(v
)
686 for e
in self.n_expr
do v
.visit_stmt
(e
)
690 # The type of a blockexpr is the one of the last expression (or null if empty)
693 if self.n_expr
.is_empty
then return null
694 return self.n_expr
.last
.mtype
698 redef class AVardeclExpr
699 redef fun accept_typing
(v
)
701 var variable
= self.variable
702 if variable
== null then return # Skip error
704 var ntype
= self.n_type
705 var mtype
: nullable MType
706 if ntype
== null then
709 mtype
= v
.resolve_mtype
(ntype
)
710 if mtype
== null then return # Skip error
713 var nexpr
= self.n_expr
714 if nexpr
!= null then
715 if mtype
!= null then
716 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
717 if etype
== mtype
then
719 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
722 mtype
= v
.visit_expr
(nexpr
)
723 if mtype
== null then return # Skip error
728 if mtype
== null or mtype
isa MNullType then
729 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
730 if mtype
== null then mtype
= decltype
733 variable
.declared_type
= decltype
734 v
.set_variable
(self, variable
, mtype
)
736 #debug("var {variable}: {mtype}")
743 redef fun its_variable
do return self.variable
744 redef fun accept_typing
(v
)
746 var variable
= self.variable
747 if variable
== null then return # Skip error
749 var mtype
= v
.get_variable
(self, variable
)
750 if mtype
!= null then
751 #debug("{variable} is {mtype}")
753 #debug("{variable} is untyped")
760 redef class AVarAssignExpr
761 redef fun accept_typing
(v
)
763 var variable
= self.variable
764 assert variable
!= null
766 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
768 v
.set_variable
(self, variable
, mtype
)
774 redef class AReassignFormExpr
775 # The method designed by the reassign operator.
776 var reassign_callsite
: nullable CallSite
778 var read_type
: nullable MType = null
780 # Determine the `reassign_property`
781 # `readtype` is the type of the reading of the left value.
782 # `writetype` is the type of the writing of the left value.
783 # (Because of `ACallReassignExpr`, both can be different.
784 # Return the static type of the value to store.
785 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
787 var reassign_name
: String
788 if self.n_assign_op
isa APlusAssignOp then
790 else if self.n_assign_op
isa AMinusAssignOp then
796 self.read_type
= readtype
798 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
799 if callsite
== null then return null # Skip error
800 self.reassign_callsite
= callsite
802 var msignature
= callsite
.msignature
803 var rettype
= msignature
.return_mtype
804 assert msignature
.arity
== 1 and rettype
!= null
806 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
807 if value_type
== null then return null # Skip error
809 v
.check_subtype
(self, rettype
, writetype
)
814 redef class AVarReassignExpr
815 redef fun accept_typing
(v
)
817 var variable
= self.variable
818 assert variable
!= null
820 var readtype
= v
.get_variable
(self, variable
)
821 if readtype
== null then return
825 var writetype
= variable
.declared_type
826 if writetype
== null then return
828 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
830 v
.set_variable
(self, variable
, rettype
)
837 redef class AContinueExpr
838 redef fun accept_typing
(v
)
840 var nexpr
= self.n_expr
841 if nexpr
!= null then
848 redef class ABreakExpr
849 redef fun accept_typing
(v
)
851 var nexpr
= self.n_expr
852 if nexpr
!= null then
859 redef class AReturnExpr
860 redef fun accept_typing
(v
)
862 var nexpr
= self.n_expr
864 var mpropdef
= v
.mpropdef
865 if mpropdef
isa MMethodDef then
866 ret_type
= mpropdef
.msignature
.return_mtype
867 else if mpropdef
isa MAttributeDef then
868 ret_type
= mpropdef
.static_mtype
872 if nexpr
!= null then
873 if ret_type
!= null then
874 v
.visit_expr_subtype
(nexpr
, ret_type
)
877 v
.error
(self, "Error: Return with value in a procedure.")
879 else if ret_type
!= null then
880 v
.error
(self, "Error: Return without value in a function.")
886 redef class AAbortExpr
887 redef fun accept_typing
(v
)
894 redef fun accept_typing
(v
)
896 v
.visit_expr_bool
(n_expr
)
903 if n_then
!= null and n_else
== null then
904 self.mtype
= n_then
.mtype
909 redef class AIfexprExpr
910 redef fun accept_typing
(v
)
912 v
.visit_expr_bool
(n_expr
)
914 var t1
= v
.visit_expr
(n_then
)
915 var t2
= v
.visit_expr
(n_else
)
917 if t1
== null or t2
== null then
921 var t
= v
.merge_types
(self, [t1
, t2
])
923 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
930 redef fun accept_typing
(v
)
932 v
.visit_stmt
(n_block
)
937 redef class AWhileExpr
938 redef fun accept_typing
(v
)
940 v
.visit_expr_bool
(n_expr
)
942 v
.visit_stmt
(n_block
)
947 redef class ALoopExpr
948 redef fun accept_typing
(v
)
950 v
.visit_stmt
(n_block
)
956 var coltype
: nullable MClassType
958 var method_iterator
: nullable CallSite
959 var method_is_ok
: nullable CallSite
960 var method_item
: nullable CallSite
961 var method_next
: nullable CallSite
962 var method_key
: nullable CallSite
963 var method_finish
: nullable CallSite
965 var method_lt
: nullable CallSite
966 var method_successor
: nullable CallSite
968 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
970 if mtype
isa MNullType then
971 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
976 var objcla
= v
.get_mclass
(self, "Object")
977 if objcla
== null then return
979 # check iterator method
980 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
981 if itdef
== null then
982 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
985 self.method_iterator
= itdef
987 # check that iterator return something
988 var ittype
= itdef
.msignature
.return_mtype
989 if ittype
== null then
990 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
995 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
996 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1000 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1002 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1003 var variables
= self.variables
1004 if variables
.length
!= 1 then
1005 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
1007 variables
.first
.declared_type
= coltype
.arguments
.first
1012 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1014 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1015 var variables
= self.variables
1016 if variables
.length
!= 2 then
1017 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
1019 variables
[0].declared_type
= coltype
.arguments
[0]
1020 variables
[1].declared_type
= coltype
.arguments
[1]
1025 if not is_col
and not is_map
then
1026 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1030 # anchor formal and virtual types
1031 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1033 mtype
= mtype
.undecorate
1034 self.coltype
= mtype
.as(MClassType)
1036 # get methods is_ok, next, item
1037 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1038 if ikdef
== null then
1039 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1042 self.method_is_ok
= ikdef
1044 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1045 if itemdef
== null then
1046 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1049 self.method_item
= itemdef
1051 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1052 if nextdef
== null then
1053 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1056 self.method_next
= nextdef
1058 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1061 var keydef
= v
.get_method
(self, ittype
, "key", false)
1062 if keydef
== null then
1063 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1066 self.method_key
= keydef
1069 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1070 var variable
= variables
.first
1071 var vtype
= variable
.declared_type
.as(not null)
1073 if n_expr
isa AOrangeExpr then
1074 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1076 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1079 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1083 redef fun accept_typing
(v
)
1085 var mtype
= v
.visit_expr
(n_expr
)
1086 if mtype
== null then return
1088 self.do_type_iterator
(v
, mtype
)
1090 v
.visit_stmt
(n_block
)
1091 self.mtype
= n_block
.mtype
1092 self.is_typed
= true
1096 redef class AAssertExpr
1097 redef fun accept_typing
(v
)
1099 v
.visit_expr_bool
(n_expr
)
1101 v
.visit_stmt
(n_else
)
1102 self.is_typed
= true
1107 redef fun accept_typing
(v
)
1109 v
.visit_expr_bool
(n_expr
)
1110 v
.visit_expr_bool
(n_expr2
)
1111 self.mtype
= v
.type_bool
(self)
1115 redef class AImpliesExpr
1116 redef fun accept_typing
(v
)
1118 v
.visit_expr_bool
(n_expr
)
1119 v
.visit_expr_bool
(n_expr2
)
1120 self.mtype
= v
.type_bool
(self)
1124 redef class AAndExpr
1125 redef fun accept_typing
(v
)
1127 v
.visit_expr_bool
(n_expr
)
1128 v
.visit_expr_bool
(n_expr2
)
1129 self.mtype
= v
.type_bool
(self)
1134 redef class ANotExpr
1135 redef fun accept_typing
(v
)
1137 v
.visit_expr_bool
(n_expr
)
1138 self.mtype
= v
.type_bool
(self)
1142 redef class AOrElseExpr
1143 redef fun accept_typing
(v
)
1145 var t1
= v
.visit_expr
(n_expr
)
1146 var t2
= v
.visit_expr
(n_expr2
)
1148 if t1
== null or t2
== null then
1152 if t1
isa MNullType then
1153 v
.error
(n_expr
, "Type error: or else on null")
1154 else if v
.check_can_be_null
(n_expr
, t1
) then
1158 var t
= v
.merge_types
(self, [t1
, t2
])
1160 t
= v
.mmodule
.object_type
1161 if v
.can_be_null
(t2
) then
1164 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1170 redef class ATrueExpr
1171 redef fun accept_typing
(v
)
1173 self.mtype
= v
.type_bool
(self)
1177 redef class AFalseExpr
1178 redef fun accept_typing
(v
)
1180 self.mtype
= v
.type_bool
(self)
1184 redef class AIntExpr
1185 redef fun accept_typing
(v
)
1187 var mclass
= v
.get_mclass
(self, "Int")
1188 if mclass
== null then return # Forward error
1189 self.mtype
= mclass
.mclass_type
1193 redef class AFloatExpr
1194 redef fun accept_typing
(v
)
1196 var mclass
= v
.get_mclass
(self, "Float")
1197 if mclass
== null then return # Forward error
1198 self.mtype
= mclass
.mclass_type
1202 redef class ACharExpr
1203 redef fun accept_typing
(v
)
1205 var mclass
= v
.get_mclass
(self, "Char")
1206 if mclass
== null then return # Forward error
1207 self.mtype
= mclass
.mclass_type
1211 redef class AStringFormExpr
1212 redef fun accept_typing
(v
)
1214 var mclass
= v
.get_mclass
(self, "String")
1215 if mclass
== null then return # Forward error
1216 self.mtype
= mclass
.mclass_type
1220 redef class ASuperstringExpr
1221 redef fun accept_typing
(v
)
1223 var mclass
= v
.get_mclass
(self, "String")
1224 if mclass
== null then return # Forward error
1225 self.mtype
= mclass
.mclass_type
1226 for nexpr
in self.n_exprs
do
1227 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1232 redef class AArrayExpr
1233 # The `with_capacity` method on Array
1234 var with_capacity_callsite
: nullable CallSite
1236 # The `push` method on arrays
1237 var push_callsite
: nullable CallSite
1239 # The element of each type
1240 var element_mtype
: nullable MType
1242 # Set that `self` is a part of comprehension array `na`
1243 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1244 private fun set_comprehension
(n
: nullable AExpr)
1248 else if n
isa AForExpr then
1249 set_comprehension
(n
.n_block
)
1250 else if n
isa AIfExpr then
1251 set_comprehension
(n
.n_then
)
1252 set_comprehension
(n
.n_else
)
1255 n
.comprehension
= self
1258 redef fun accept_typing
(v
)
1260 var mtype
: nullable MType = null
1261 var ntype
= self.n_type
1262 if ntype
!= null then
1263 mtype
= v
.resolve_mtype
(ntype
)
1264 if mtype
== null then return # Skip error
1266 var mtypes
= new Array[nullable MType]
1268 for e
in self.n_exprs
do
1269 var t
= v
.visit_expr
(e
)
1273 set_comprehension
(e
)
1274 if mtype
!= null then
1275 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1276 if t
== mtype
then useless
= true
1281 if mtype
== null then
1282 mtype
= v
.merge_types
(self, mtypes
)
1284 if mtype
== null or mtype
isa MNullType then
1285 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1289 assert ntype
!= null
1290 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1293 self.element_mtype
= mtype
1295 var mclass
= v
.get_mclass
(self, "Array")
1296 if mclass
== null then return # Forward error
1297 var array_mtype
= mclass
.get_mtype
([mtype
])
1299 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1300 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1302 self.mtype
= array_mtype
1306 redef class ARangeExpr
1307 var init_callsite
: nullable CallSite
1309 redef fun accept_typing
(v
)
1311 var discrete_class
= v
.get_mclass
(self, "Discrete")
1312 if discrete_class
== null then return # Forward error
1313 var discrete_type
= discrete_class
.intro
.bound_mtype
1314 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1315 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1316 if t1
== null or t2
== null then return
1317 var mclass
= v
.get_mclass
(self, "Range")
1318 if mclass
== null then return # Forward error
1320 if v
.is_subtype
(t1
, t2
) then
1321 mtype
= mclass
.get_mtype
([t2
])
1322 else if v
.is_subtype
(t2
, t1
) then
1323 mtype
= mclass
.get_mtype
([t1
])
1325 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1331 # get the constructor
1333 if self isa ACrangeExpr then
1334 callsite
= v
.get_method
(self, mtype
, "init", false)
1335 else if self isa AOrangeExpr then
1336 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1340 init_callsite
= callsite
1344 redef class ANullExpr
1345 redef fun accept_typing
(v
)
1347 self.mtype
= v
.mmodule
.model
.null_type
1351 redef class AIsaExpr
1352 # The static type to cast to.
1353 # (different from the static type of the expression that is `Bool`).
1354 var cast_type
: nullable MType
1355 redef fun accept_typing
(v
)
1357 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1358 self.cast_type
= mtype
1360 var variable
= self.n_expr
.its_variable
1361 if variable
!= null then
1362 #var orig = self.n_expr.mtype
1363 #var from = if orig != null then orig.to_s else "invalid"
1364 #var to = if mtype != null then mtype.to_s else "invalid"
1365 #debug("adapt {variable}: {from} -> {to}")
1366 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1369 self.mtype
= v
.type_bool
(self)
1373 redef class AAsCastExpr
1374 redef fun accept_typing
(v
)
1376 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1380 redef class AAsNotnullExpr
1381 redef fun accept_typing
(v
)
1383 var mtype
= v
.visit_expr
(self.n_expr
)
1384 if mtype
== null then return # Forward error
1386 if mtype
isa MNullType then
1387 v
.error
(self, "Type error: as(not null) on null")
1391 if v
.check_can_be_null
(n_expr
, mtype
) then
1392 mtype
= mtype
.as_notnull
1399 redef class AParExpr
1400 redef fun accept_typing
(v
)
1402 self.mtype
= v
.visit_expr
(self.n_expr
)
1406 redef class AOnceExpr
1407 redef fun accept_typing
(v
)
1409 self.mtype
= v
.visit_expr
(self.n_expr
)
1413 redef class ASelfExpr
1414 redef var its_variable
: nullable Variable
1415 redef fun accept_typing
(v
)
1417 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1418 v
.error
(self, "Error: self cannot be used in top-level method.")
1420 var variable
= v
.selfvariable
1421 self.its_variable
= variable
1422 self.mtype
= v
.get_variable
(self, variable
)
1426 ## MESSAGE SENDING AND PROPERTY
1428 redef class ASendExpr
1429 # The property invoked by the send.
1430 var callsite
: nullable CallSite
1432 redef fun accept_typing
(v
)
1434 var recvtype
= v
.visit_expr
(self.n_expr
)
1435 var name
= self.property_name
1437 if recvtype
== null then return # Forward error
1439 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1440 if callsite
== null then return
1441 self.callsite
= callsite
1442 var msignature
= callsite
.msignature
1444 var args
= compute_raw_arguments
1446 callsite
.check_signature
(v
, args
)
1448 if callsite
.mproperty
.is_init
then
1449 var vmpropdef
= v
.mpropdef
1450 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1451 v
.error
(self, "Can call a init only in another init")
1453 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1454 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1458 var ret
= msignature
.return_mtype
1462 self.is_typed
= true
1466 # The name of the property
1467 # Each subclass simply provide the correct name.
1468 private fun property_name
: String is abstract
1470 # An array of all arguments (excluding self)
1471 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1473 private fun compute_raw_arguments
: Array[AExpr] is abstract
1476 redef class ABinopExpr
1477 redef fun compute_raw_arguments
do return [n_expr2
]
1480 redef fun property_name
do return "=="
1481 redef fun accept_typing
(v
)
1488 redef fun property_name
do return "!="
1489 redef fun accept_typing
(v
)
1496 redef fun property_name
do return "<"
1499 redef fun property_name
do return "<="
1502 redef fun property_name
do return "<<"
1505 redef fun property_name
do return ">"
1508 redef fun property_name
do return ">="
1511 redef fun property_name
do return ">>"
1513 redef class APlusExpr
1514 redef fun property_name
do return "+"
1516 redef class AMinusExpr
1517 redef fun property_name
do return "-"
1519 redef class AStarshipExpr
1520 redef fun property_name
do return "<=>"
1522 redef class AStarExpr
1523 redef fun property_name
do return "*"
1525 redef class AStarstarExpr
1526 redef fun property_name
do return "**"
1528 redef class ASlashExpr
1529 redef fun property_name
do return "/"
1531 redef class APercentExpr
1532 redef fun property_name
do return "%"
1535 redef class AUminusExpr
1536 redef fun property_name
do return "unary -"
1537 redef fun compute_raw_arguments
do return new Array[AExpr]
1541 redef class ACallExpr
1542 redef fun property_name
do return n_id
.text
1543 redef fun compute_raw_arguments
do return n_args
.to_a
1546 redef class ACallAssignExpr
1547 redef fun property_name
do return n_id
.text
+ "="
1548 redef fun compute_raw_arguments
1550 var res
= n_args
.to_a
1556 redef class ABraExpr
1557 redef fun property_name
do return "[]"
1558 redef fun compute_raw_arguments
do return n_args
.to_a
1561 redef class ABraAssignExpr
1562 redef fun property_name
do return "[]="
1563 redef fun compute_raw_arguments
1565 var res
= n_args
.to_a
1571 redef class ASendReassignFormExpr
1572 # The property invoked for the writing
1573 var write_callsite
: nullable CallSite
1575 redef fun accept_typing
(v
)
1577 var recvtype
= v
.visit_expr
(self.n_expr
)
1578 var name
= self.property_name
1580 if recvtype
== null then return # Forward error
1582 var for_self
= self.n_expr
isa ASelfExpr
1583 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1585 if callsite
== null then return
1586 self.callsite
= callsite
1588 var args
= compute_raw_arguments
1590 callsite
.check_signature
(v
, args
)
1592 var readtype
= callsite
.msignature
.return_mtype
1593 if readtype
== null then
1594 v
.error
(self, "Error: {name} is not a function")
1598 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1599 if wcallsite
== null then return
1600 self.write_callsite
= wcallsite
1602 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1603 if wtype
== null then return
1605 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1606 args
.add
(self.n_value
)
1607 wcallsite
.check_signature
(v
, args
)
1609 self.is_typed
= true
1613 redef class ACallReassignExpr
1614 redef fun property_name
do return n_id
.text
1615 redef fun compute_raw_arguments
do return n_args
.to_a
1618 redef class ABraReassignExpr
1619 redef fun property_name
do return "[]"
1620 redef fun compute_raw_arguments
do return n_args
.to_a
1623 redef class AInitExpr
1624 redef fun property_name
do return "init"
1625 redef fun compute_raw_arguments
do return n_args
.to_a
1629 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1634 redef class ASuperExpr
1635 # The method to call if the super is in fact a 'super init call'
1636 # Note: if the super is a normal call-next-method, then this attribute is null
1637 var callsite
: nullable CallSite
1639 # The method to call is the super is a standard `call-next-method` super-call
1640 # Note: if the super is a special super-init-call, then this attribute is null
1641 var mpropdef
: nullable MMethodDef
1643 redef fun accept_typing
(v
)
1645 var anchor
= v
.anchor
1646 assert anchor
!= null
1647 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1648 assert recvtype
!= null
1649 var mproperty
= v
.mpropdef
.mproperty
1650 if not mproperty
isa MMethod then
1651 v
.error
(self, "Error: super only usable in a method")
1654 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1655 if superprops
.length
== 0 then
1656 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1657 process_superinit
(v
)
1660 v
.error
(self, "Error: No super method to call for {mproperty}.")
1663 # FIXME: covariance of return type in linear extension?
1664 var superprop
= superprops
.first
1666 var msignature
= superprop
.msignature
.as(not null)
1667 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1668 var args
= self.n_args
.to_a
1669 if args
.length
> 0 then
1670 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1672 self.mtype
= msignature
.return_mtype
1673 self.is_typed
= true
1674 v
.mpropdef
.has_supercall
= true
1675 mpropdef
= v
.mpropdef
.as(MMethodDef)
1678 private fun process_superinit
(v
: TypeVisitor)
1680 var anchor
= v
.anchor
1681 assert anchor
!= null
1682 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1683 assert recvtype
!= null
1684 var mpropdef
= v
.mpropdef
1685 assert mpropdef
isa MMethodDef
1686 var mproperty
= mpropdef
.mproperty
1687 var superprop
: nullable MMethodDef = null
1688 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1689 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1690 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1691 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1692 if candidate
== null then
1693 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1694 continue # Try next super-class
1696 if superprop
!= null and candidate
.is_root_init
then
1699 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1700 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1703 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1704 if superprop
!= null and superprop
.mproperty
== candidate
then
1705 if superprop
== candidatedefs
.first
then continue
1706 candidatedefs
.add
(superprop
)
1708 if candidatedefs
.length
> 1 then
1709 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1712 superprop
= candidatedefs
.first
1714 if superprop
== null then
1715 v
.error
(self, "Error: No super method to call for {mproperty}.")
1719 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1720 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1722 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1723 self.callsite
= callsite
1725 var args
= self.n_args
.to_a
1726 if args
.length
> 0 then
1727 callsite
.check_signature
(v
, args
)
1729 # Check there is at least enough parameters
1730 if mpropdef
.msignature
.arity
< msignature
.arity
then
1731 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1734 # Check that each needed parameter is conform
1736 for sp
in msignature
.mparameters
do
1737 var p
= mpropdef
.msignature
.mparameters
[i
]
1738 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1739 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1746 self.is_typed
= true
1752 redef class ANewExpr
1753 # The constructor invoked by the new.
1754 var callsite
: nullable CallSite
1756 # The designated type
1757 var recvtype
: nullable MClassType
1759 redef fun accept_typing
(v
)
1761 var recvtype
= v
.resolve_mtype
(self.n_type
)
1762 if recvtype
== null then return
1764 if not recvtype
isa MClassType then
1765 if recvtype
isa MNullableType then
1766 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1769 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1774 self.recvtype
= recvtype
1783 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1784 if callsite
== null then return
1786 if not callsite
.mproperty
.is_new
then
1787 var kind
= recvtype
.mclass
.kind
1788 if kind
!= concrete_kind
then
1789 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1792 self.mtype
= recvtype
1794 self.mtype
= callsite
.msignature
.return_mtype
1795 assert self.mtype
!= null
1798 self.callsite
= callsite
1800 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1801 v
.error
(self, "Error: {name} is not a constructor.")
1805 var args
= n_args
.to_a
1806 callsite
.check_signature
(v
, args
)
1812 redef class AAttrFormExpr
1813 # The attribute acceded.
1814 var mproperty
: nullable MAttribute
1816 # The static type of the attribute.
1817 var attr_type
: nullable MType
1819 # Resolve the attribute acceded.
1820 private fun resolve_property
(v
: TypeVisitor)
1822 var recvtype
= v
.visit_expr
(self.n_expr
)
1823 if recvtype
== null then return # Skip error
1824 var name
= self.n_id
.text
1825 if recvtype
isa MNullType then
1826 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1830 var unsafe_type
= v
.anchor_to
(recvtype
)
1831 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1832 if mproperty
== null then
1833 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1836 assert mproperty
isa MAttribute
1837 self.mproperty
= mproperty
1839 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1840 assert mpropdefs
.length
== 1
1841 var mpropdef
= mpropdefs
.first
1842 var attr_type
= mpropdef
.static_mtype
.as(not null)
1843 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1844 self.attr_type
= attr_type
1848 redef class AAttrExpr
1849 redef fun accept_typing
(v
)
1851 self.resolve_property
(v
)
1852 self.mtype
= self.attr_type
1857 redef class AAttrAssignExpr
1858 redef fun accept_typing
(v
)
1860 self.resolve_property
(v
)
1861 var mtype
= self.attr_type
1863 v
.visit_expr_subtype
(self.n_value
, mtype
)
1864 self.is_typed
= true
1868 redef class AAttrReassignExpr
1869 redef fun accept_typing
(v
)
1871 self.resolve_property
(v
)
1872 var mtype
= self.attr_type
1873 if mtype
== null then return # Skip error
1875 self.resolve_reassignment
(v
, mtype
, mtype
)
1877 self.is_typed
= true
1881 redef class AIssetAttrExpr
1882 redef fun accept_typing
(v
)
1884 self.resolve_property
(v
)
1885 var mtype
= self.attr_type
1886 if mtype
== null then return # Skip error
1888 var recvtype
= self.n_expr
.mtype
.as(not null)
1889 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1890 if bound
isa MNullableType then
1891 v
.error
(self, "Error: isset on a nullable attribute.")
1893 self.mtype
= v
.type_bool
(self)
1897 redef class AVarargExpr
1898 redef fun accept_typing
(v
)
1900 # This kind of pseudo-expression can be only processed trough a signature
1901 # See `check_signature`
1902 # Other cases are a syntax error.
1903 v
.error
(self, "Syntax error: unexpected `...`")
1909 redef class ADebugTypeExpr
1910 redef fun accept_typing
(v
)
1912 var expr
= v
.visit_expr
(self.n_expr
)
1913 if expr
== null then return
1914 var unsafe
= v
.anchor_to
(expr
)
1915 var ntype
= self.n_type
1916 var mtype
= v
.resolve_mtype
(ntype
)
1917 if mtype
!= null and mtype
!= expr
then
1918 var umtype
= v
.anchor_to
(mtype
)
1919 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1921 self.is_typed
= true