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 # Special verification on != and == for null
199 fun null_test
(anode
: ABinopExpr)
201 var mtype
= anode
.n_expr
.mtype
202 var mtype2
= anode
.n_expr2
.mtype
204 if mtype
== null or mtype2
== null then return
206 if not mtype2
isa MNullType then return
208 # Check of useless null
209 if not mtype
isa MNullableType then
210 if not anchor_to
(mtype
) isa MNullableType then
211 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
216 # Check for type adaptation
217 var variable
= anode
.n_expr
.its_variable
218 if variable
== null then return
220 if anode
isa AEqExpr then
221 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
222 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
.mtype
)
223 else if anode
isa ANeExpr then
224 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
225 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
.mtype
)
231 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
233 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
236 fun resolve_mtype
(node
: AType): nullable MType
238 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
241 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
243 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
247 fun get_mclass
(node
: ANode, name
: String): nullable MClass
249 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
250 if mclass
== null then
251 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
256 fun type_bool
(node
: ANode): nullable MType
258 var mclass
= self.get_mclass
(node
, "Bool")
259 if mclass
== null then return null
260 return mclass
.mclass_type
263 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
265 var unsafe_type
= self.anchor_to
(recvtype
)
267 #debug("recv: {recvtype} (aka {unsafe_type})")
268 if recvtype
isa MNullType then
269 # `null` only accepts some methods of object.
270 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
271 unsafe_type
= mmodule
.object_type
.as_nullable
273 self.error
(node
, "Error: Method '{name}' call on 'null'.")
278 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
279 if name
== "new" and mproperty
== null then
281 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
284 if mproperty
== null then
285 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
287 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
289 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
294 assert mproperty
isa MMethod
296 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
297 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
299 if not recv_is_self
and mproperty
.is_toplevel
then
300 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
303 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
304 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
308 var info
= mproperty
.deprecation
309 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
312 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
314 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
318 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
320 if propdefs
.length
== 0 then
321 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
323 else if propdefs
.length
== 1 then
324 mpropdef
= propdefs
.first
326 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
327 mpropdef
= mproperty
.intro
331 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
332 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
334 var erasure_cast
= false
335 var rettype
= mpropdef
.msignature
.return_mtype
336 if not recv_is_self
and rettype
!= null then
337 rettype
= rettype
.as_notnullable
338 if rettype
isa MParameterType then
339 var erased_rettype
= msignature
.return_mtype
340 assert erased_rettype
!= null
341 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
346 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
350 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
352 var unsafe_type
= self.anchor_to
(recvtype
)
353 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
354 if mproperty
== null then return null
355 return get_method
(node
, recvtype
, name
, recv_is_self
)
359 # Visit the expressions of args and check their conformity with the corresponding type in signature
360 # The point of this method is to handle varargs correctly
361 # Note: The signature must be correctly adapted
362 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
364 var vararg_rank
= msignature
.vararg_rank
365 if vararg_rank
>= 0 then
366 if args
.length
< msignature
.arity
then
367 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
368 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
371 else if args
.length
!= msignature
.arity
then
372 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
376 #debug("CALL {unsafe_type}.{msignature}")
378 var vararg_decl
= args
.length
- msignature
.arity
379 for i
in [0..msignature
.arity
[ do
381 if i
== vararg_rank
then continue # skip the vararg
382 if i
> vararg_rank
then
385 var paramtype
= msignature
.mparameters
[i
].mtype
386 self.visit_expr_subtype
(args
[j
], paramtype
)
388 if vararg_rank
>= 0 then
389 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
390 var first
= args
[vararg_rank
]
391 if vararg_decl
== 0 and first
isa AVarargExpr then
392 var mclass
= get_mclass
(node
, "Array")
393 if mclass
== null then return false # Forward error
394 var array_mtype
= mclass
.get_mtype
([paramtype
])
395 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
396 first
.mtype
= first
.n_expr
.mtype
398 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
399 self.visit_expr_subtype
(args
[j
], paramtype
)
406 fun error
(node
: ANode, message
: String)
408 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
411 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
413 var flow
= node
.after_flow_context
415 self.error
(node
, "No context!")
419 if flow
.vars
.has_key
(variable
) then
420 return flow
.vars
[variable
]
422 #node.debug("*** START Collected for {variable}")
423 var mtypes
= flow
.collect_types
(variable
)
424 #node.debug("**** END Collected for {variable}")
425 if mtypes
== null or mtypes
.length
== 0 then
426 return variable
.declared_type
427 else if mtypes
.length
== 1 then
430 var res
= merge_types
(node
,mtypes
)
431 if res
== null then res
= variable
.declared_type
437 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
439 var flow
= node
.after_flow_context
442 flow
.set_var
(variable
, mtype
)
445 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
447 if col
.length
== 1 then return col
.first
449 if t1
== null then continue # return null
452 if t2
== null then continue # return null
453 if t2
isa MNullableType or t2
isa MNullType then
456 if not is_subtype
(t2
, t1
) then found
= false
459 #print "merge {col.join(" ")} -> {t1}"
463 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
468 # A specific method call site with its associated informations.
470 # The associated node for location
473 # The static type of the receiver (possibly unresolved)
476 # The module where the callsite is present
479 # The anchor to use with `recv` or `msignature`
480 var anchor
: nullable MClassType
482 # Is the receiver self?
483 # If "for_self", virtual types of the signature are kept
484 # If "not_for_self", virtual type are erased
485 var recv_is_self
: Bool
487 # The designated method
488 var mproperty
: MMethod
490 # The statically designated method definition
491 # The most specif one, it is.
492 var mpropdef
: MMethodDef
494 # The resolved signature for the receiver
495 var msignature
: MSignature
497 # Is a implicit cast required on erasure typing policy?
498 var erasure_cast
: Bool
500 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
502 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
507 # The declared type of the variable
508 var declared_type
: nullable MType
511 redef class FlowContext
512 # Store changes of types because of type evolution
513 private var vars
= new HashMap[Variable, nullable MType]
514 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
516 # Adapt the variable to a static type
517 # Warning1: do not modify vars directly.
518 # Warning2: sub-flow may have cached a unadapted variable
519 private fun set_var
(variable
: Variable, mtype
: nullable MType)
521 self.vars
[variable
] = mtype
522 self.cache
.keys
.remove
(variable
)
525 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
527 if cache
.has_key
(variable
) then
528 return cache
[variable
]
530 var res
: nullable Array[nullable MType] = null
531 if vars
.has_key
(variable
) then
532 var mtype
= vars
[variable
]
534 else if self.previous
.is_empty
then
536 res
= [variable
.declared_type
]
538 for flow
in self.previous
do
539 if flow
.is_unreachable
then continue
540 var r2
= flow
.collect_types
(variable
)
541 if r2
== null then continue
546 if not res
.has
(t
) then res
.add
(t
)
551 cache
[variable
] = res
557 # The entry point of the whole typing analysis
558 fun do_typing
(modelbuilder
: ModelBuilder)
562 # The variable associated to the receiver (if any)
563 var selfvariable
: nullable Variable
566 redef class AMethPropdef
567 redef fun do_typing
(modelbuilder
: ModelBuilder)
569 var nblock
= self.n_block
570 if nblock
== null then return
572 var mpropdef
= self.mpropdef
.as(not null)
573 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
574 self.selfvariable
= v
.selfvariable
576 var mmethoddef
= self.mpropdef
.as(not null)
577 for i
in [0..mmethoddef
.msignature
.arity
[ do
578 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
579 if mmethoddef
.msignature
.vararg_rank
== i
then
580 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
581 if arrayclass
== null then return # Skip error
582 mtype
= arrayclass
.get_mtype
([mtype
])
584 var variable
= self.n_signature
.n_params
[i
].variable
585 assert variable
!= null
586 variable
.declared_type
= mtype
590 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
591 # We reach the end of the function without having a return, it is bad
592 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
597 redef class AAttrPropdef
598 redef fun do_typing
(modelbuilder
: ModelBuilder)
600 if not has_value
then return
602 var mpropdef
= self.mpropdef
.as(not null)
603 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
604 self.selfvariable
= v
.selfvariable
606 var nexpr
= self.n_expr
607 if nexpr
!= null then
608 var mtype
= self.mpropdef
.static_mtype
609 v
.visit_expr_subtype
(nexpr
, mtype
)
611 var nblock
= self.n_block
612 if nblock
!= null then
614 if not nblock
.after_flow_context
.is_unreachable
then
615 # We reach the end of the init without having a return, it is bad
616 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
625 # The static type of the expression.
626 # null if self is a statement or in case of error
627 var mtype
: nullable MType = null
629 # Is the statement correctly typed?
630 # Used to distinguish errors and statements when `mtype == null`
631 var is_typed
: Bool = false
633 # If required, the following implicit cast `.as(XXX)`
634 # Such a cast may by required after evaluating the expression when
635 # a unsafe operation is detected (silently accepted by the Nit language).
636 # The attribute is computed by `check_subtype`
637 var implicit_cast_to
: nullable MType = null
639 # Return the variable read (if any)
640 # Used to perform adaptive typing
641 fun its_variable
: nullable Variable do return null
643 private fun accept_typing
(v
: TypeVisitor)
645 v
.error
(self, "no implemented accept_typing for {self.class_name}")
648 # Is non-null if `self` is a leaf of a comprehension array construction.
649 # In this case, the enclosing literal array node is designated.
650 # The result of the evaluation of `self` must be
651 # stored inside the designated array (there is an implicit `push`)
652 var comprehension
: nullable AArrayExpr = null
655 redef class ABlockExpr
656 redef fun accept_typing
(v
)
658 for e
in self.n_expr
do v
.visit_stmt
(e
)
662 # The type of a blockexpr is the one of the last expression (or null if empty)
665 if self.n_expr
.is_empty
then return null
666 return self.n_expr
.last
.mtype
670 redef class AVardeclExpr
671 redef fun accept_typing
(v
)
673 var variable
= self.variable
674 if variable
== null then return # Skip error
676 var ntype
= self.n_type
677 var mtype
: nullable MType
678 if ntype
== null then
681 mtype
= v
.resolve_mtype
(ntype
)
682 if mtype
== null then return # Skip error
685 var nexpr
= self.n_expr
686 if nexpr
!= null then
687 if mtype
!= null then
688 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
689 if etype
== mtype
then
691 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
694 mtype
= v
.visit_expr
(nexpr
)
695 if mtype
== null then return # Skip error
700 if mtype
== null or mtype
isa MNullType then
701 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
702 if mtype
== null then mtype
= decltype
705 variable
.declared_type
= decltype
706 v
.set_variable
(self, variable
, mtype
)
708 #debug("var {variable}: {mtype}")
715 redef fun its_variable
do return self.variable
716 redef fun accept_typing
(v
)
718 var variable
= self.variable
719 if variable
== null then return # Skip error
721 var mtype
= v
.get_variable
(self, variable
)
722 if mtype
!= null then
723 #debug("{variable} is {mtype}")
725 #debug("{variable} is untyped")
732 redef class AVarAssignExpr
733 redef fun accept_typing
(v
)
735 var variable
= self.variable
736 assert variable
!= null
738 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
740 v
.set_variable
(self, variable
, mtype
)
746 redef class AReassignFormExpr
747 # The method designed by the reassign operator.
748 var reassign_callsite
: nullable CallSite
750 var read_type
: nullable MType = null
752 # Determine the `reassign_property`
753 # `readtype` is the type of the reading of the left value.
754 # `writetype` is the type of the writing of the left value.
755 # (Because of `ACallReassignExpr`, both can be different.
756 # Return the static type of the value to store.
757 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
759 var reassign_name
: String
760 if self.n_assign_op
isa APlusAssignOp then
762 else if self.n_assign_op
isa AMinusAssignOp then
768 self.read_type
= readtype
770 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
771 if callsite
== null then return null # Skip error
772 self.reassign_callsite
= callsite
774 var msignature
= callsite
.msignature
775 var rettype
= msignature
.return_mtype
776 assert msignature
.arity
== 1 and rettype
!= null
778 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
779 if value_type
== null then return null # Skip error
781 v
.check_subtype
(self, rettype
, writetype
)
786 redef class AVarReassignExpr
787 redef fun accept_typing
(v
)
789 var variable
= self.variable
790 assert variable
!= null
792 var readtype
= v
.get_variable
(self, variable
)
793 if readtype
== null then return
797 var writetype
= variable
.declared_type
798 if writetype
== null then return
800 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
802 v
.set_variable
(self, variable
, rettype
)
809 redef class AContinueExpr
810 redef fun accept_typing
(v
)
812 var nexpr
= self.n_expr
813 if nexpr
!= null then
820 redef class ABreakExpr
821 redef fun accept_typing
(v
)
823 var nexpr
= self.n_expr
824 if nexpr
!= null then
831 redef class AReturnExpr
832 redef fun accept_typing
(v
)
834 var nexpr
= self.n_expr
836 var mpropdef
= v
.mpropdef
837 if mpropdef
isa MMethodDef then
838 ret_type
= mpropdef
.msignature
.return_mtype
839 else if mpropdef
isa MAttributeDef then
840 ret_type
= mpropdef
.static_mtype
844 if nexpr
!= null then
845 if ret_type
!= null then
846 v
.visit_expr_subtype
(nexpr
, ret_type
)
849 v
.error
(self, "Error: Return with value in a procedure.")
851 else if ret_type
!= null then
852 v
.error
(self, "Error: Return without value in a function.")
858 redef class AAbortExpr
859 redef fun accept_typing
(v
)
866 redef fun accept_typing
(v
)
868 v
.visit_expr_bool
(n_expr
)
875 if n_then
!= null and n_else
== null then
876 self.mtype
= n_then
.mtype
881 redef class AIfexprExpr
882 redef fun accept_typing
(v
)
884 v
.visit_expr_bool
(n_expr
)
886 var t1
= v
.visit_expr
(n_then
)
887 var t2
= v
.visit_expr
(n_else
)
889 if t1
== null or t2
== null then
893 var t
= v
.merge_types
(self, [t1
, t2
])
895 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
902 redef fun accept_typing
(v
)
904 v
.visit_stmt
(n_block
)
909 redef class AWhileExpr
910 redef fun accept_typing
(v
)
912 v
.visit_expr_bool
(n_expr
)
914 v
.visit_stmt
(n_block
)
919 redef class ALoopExpr
920 redef fun accept_typing
(v
)
922 v
.visit_stmt
(n_block
)
928 var coltype
: nullable MClassType
930 var method_iterator
: nullable CallSite
931 var method_is_ok
: nullable CallSite
932 var method_item
: nullable CallSite
933 var method_next
: nullable CallSite
934 var method_key
: nullable CallSite
935 var method_finish
: nullable CallSite
937 var method_lt
: nullable CallSite
938 var method_successor
: nullable CallSite
940 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
942 if mtype
isa MNullType then
943 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
948 var objcla
= v
.get_mclass
(self, "Object")
949 if objcla
== null then return
951 # check iterator method
952 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
953 if itdef
== null then
954 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
957 self.method_iterator
= itdef
959 # check that iterator return something
960 var ittype
= itdef
.msignature
.return_mtype
961 if ittype
== null then
962 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
967 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
968 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
972 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
974 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
975 var variables
= self.variables
976 if variables
.length
!= 1 then
977 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
979 variables
.first
.declared_type
= coltype
.arguments
.first
984 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
986 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
987 var variables
= self.variables
988 if variables
.length
!= 2 then
989 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
991 variables
[0].declared_type
= coltype
.arguments
[0]
992 variables
[1].declared_type
= coltype
.arguments
[1]
997 if not is_col
and not is_map
then
998 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1002 # anchor formal and virtual types
1003 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1005 mtype
= mtype
.as_notnullable
1006 self.coltype
= mtype
.as(MClassType)
1008 # get methods is_ok, next, item
1009 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1010 if ikdef
== null then
1011 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1014 self.method_is_ok
= ikdef
1016 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1017 if itemdef
== null then
1018 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1021 self.method_item
= itemdef
1023 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1024 if nextdef
== null then
1025 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1028 self.method_next
= nextdef
1030 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1033 var keydef
= v
.get_method
(self, ittype
, "key", false)
1034 if keydef
== null then
1035 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1038 self.method_key
= keydef
1041 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1042 var variable
= variables
.first
1043 var vtype
= variable
.declared_type
.as(not null)
1045 if n_expr
isa AOrangeExpr then
1046 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1048 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1051 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1055 redef fun accept_typing
(v
)
1057 var mtype
= v
.visit_expr
(n_expr
)
1058 if mtype
== null then return
1060 self.do_type_iterator
(v
, mtype
)
1062 v
.visit_stmt
(n_block
)
1063 self.mtype
= n_block
.mtype
1064 self.is_typed
= true
1068 redef class AAssertExpr
1069 redef fun accept_typing
(v
)
1071 v
.visit_expr_bool
(n_expr
)
1073 v
.visit_stmt
(n_else
)
1074 self.is_typed
= true
1079 redef fun accept_typing
(v
)
1081 v
.visit_expr_bool
(n_expr
)
1082 v
.visit_expr_bool
(n_expr2
)
1083 self.mtype
= v
.type_bool
(self)
1087 redef class AImpliesExpr
1088 redef fun accept_typing
(v
)
1090 v
.visit_expr_bool
(n_expr
)
1091 v
.visit_expr_bool
(n_expr2
)
1092 self.mtype
= v
.type_bool
(self)
1096 redef class AAndExpr
1097 redef fun accept_typing
(v
)
1099 v
.visit_expr_bool
(n_expr
)
1100 v
.visit_expr_bool
(n_expr2
)
1101 self.mtype
= v
.type_bool
(self)
1106 redef class ANotExpr
1107 redef fun accept_typing
(v
)
1109 v
.visit_expr_bool
(n_expr
)
1110 self.mtype
= v
.type_bool
(self)
1114 redef class AOrElseExpr
1115 redef fun accept_typing
(v
)
1117 var t1
= v
.visit_expr
(n_expr
)
1118 var t2
= v
.visit_expr
(n_expr2
)
1120 if t1
== null or t2
== null then
1124 t1
= t1
.as_notnullable
1126 var t
= v
.merge_types
(self, [t1
, t2
])
1128 t
= v
.mmodule
.object_type
1129 if t2
isa MNullableType then
1132 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1138 redef class ATrueExpr
1139 redef fun accept_typing
(v
)
1141 self.mtype
= v
.type_bool
(self)
1145 redef class AFalseExpr
1146 redef fun accept_typing
(v
)
1148 self.mtype
= v
.type_bool
(self)
1152 redef class AIntExpr
1153 redef fun accept_typing
(v
)
1155 var mclass
= v
.get_mclass
(self, "Int")
1156 if mclass
== null then return # Forward error
1157 self.mtype
= mclass
.mclass_type
1161 redef class AFloatExpr
1162 redef fun accept_typing
(v
)
1164 var mclass
= v
.get_mclass
(self, "Float")
1165 if mclass
== null then return # Forward error
1166 self.mtype
= mclass
.mclass_type
1170 redef class ACharExpr
1171 redef fun accept_typing
(v
)
1173 var mclass
= v
.get_mclass
(self, "Char")
1174 if mclass
== null then return # Forward error
1175 self.mtype
= mclass
.mclass_type
1179 redef class AStringFormExpr
1180 redef fun accept_typing
(v
)
1182 var mclass
= v
.get_mclass
(self, "String")
1183 if mclass
== null then return # Forward error
1184 self.mtype
= mclass
.mclass_type
1188 redef class ASuperstringExpr
1189 redef fun accept_typing
(v
)
1191 var mclass
= v
.get_mclass
(self, "String")
1192 if mclass
== null then return # Forward error
1193 self.mtype
= mclass
.mclass_type
1194 for nexpr
in self.n_exprs
do
1195 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1200 redef class AArrayExpr
1201 # The `with_capacity` method on Array
1202 var with_capacity_callsite
: nullable CallSite
1204 # The `push` method on arrays
1205 var push_callsite
: nullable CallSite
1207 # The element of each type
1208 var element_mtype
: nullable MType
1210 # Set that `self` is a part of comprehension array `na`
1211 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1212 private fun set_comprehension
(n
: nullable AExpr)
1216 else if n
isa AForExpr then
1217 set_comprehension
(n
.n_block
)
1218 else if n
isa AIfExpr then
1219 set_comprehension
(n
.n_then
)
1220 set_comprehension
(n
.n_else
)
1223 n
.comprehension
= self
1226 redef fun accept_typing
(v
)
1228 var mtype
: nullable MType = null
1229 var ntype
= self.n_type
1230 if ntype
!= null then
1231 mtype
= v
.resolve_mtype
(ntype
)
1232 if mtype
== null then return # Skip error
1234 var mtypes
= new Array[nullable MType]
1236 for e
in self.n_exprs
do
1237 var t
= v
.visit_expr
(e
)
1241 set_comprehension
(e
)
1242 if mtype
!= null then
1243 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1244 if t
== mtype
then useless
= true
1249 if mtype
== null then
1250 mtype
= v
.merge_types
(self, mtypes
)
1252 if mtype
== null or mtype
isa MNullType then
1253 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1257 assert ntype
!= null
1258 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1261 self.element_mtype
= mtype
1263 var mclass
= v
.get_mclass
(self, "Array")
1264 if mclass
== null then return # Forward error
1265 var array_mtype
= mclass
.get_mtype
([mtype
])
1267 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1268 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1270 self.mtype
= array_mtype
1274 redef class ARangeExpr
1275 var init_callsite
: nullable CallSite
1277 redef fun accept_typing
(v
)
1279 var discrete_class
= v
.get_mclass
(self, "Discrete")
1280 if discrete_class
== null then return # Forward error
1281 var discrete_type
= discrete_class
.intro
.bound_mtype
1282 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1283 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1284 if t1
== null or t2
== null then return
1285 var mclass
= v
.get_mclass
(self, "Range")
1286 if mclass
== null then return # Forward error
1288 if v
.is_subtype
(t1
, t2
) then
1289 mtype
= mclass
.get_mtype
([t2
])
1290 else if v
.is_subtype
(t2
, t1
) then
1291 mtype
= mclass
.get_mtype
([t1
])
1293 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1299 # get the constructor
1301 if self isa ACrangeExpr then
1302 callsite
= v
.get_method
(self, mtype
, "init", false)
1303 else if self isa AOrangeExpr then
1304 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1308 init_callsite
= callsite
1312 redef class ANullExpr
1313 redef fun accept_typing
(v
)
1315 self.mtype
= v
.mmodule
.model
.null_type
1319 redef class AIsaExpr
1320 # The static type to cast to.
1321 # (different from the static type of the expression that is `Bool`).
1322 var cast_type
: nullable MType
1323 redef fun accept_typing
(v
)
1325 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1326 self.cast_type
= mtype
1328 var variable
= self.n_expr
.its_variable
1329 if variable
!= null then
1330 #var orig = self.n_expr.mtype
1331 #var from = if orig != null then orig.to_s else "invalid"
1332 #var to = if mtype != null then mtype.to_s else "invalid"
1333 #debug("adapt {variable}: {from} -> {to}")
1334 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1337 self.mtype
= v
.type_bool
(self)
1341 redef class AAsCastExpr
1342 redef fun accept_typing
(v
)
1344 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1348 redef class AAsNotnullExpr
1349 redef fun accept_typing
(v
)
1351 var mtype
= v
.visit_expr
(self.n_expr
)
1352 if mtype
== null then return # Forward error
1354 if mtype
isa MNullType then
1355 v
.error
(self, "Type error: as(not null) on null")
1358 if mtype
isa MNullableType then
1359 self.mtype
= mtype
.mtype
1364 if mtype
isa MClassType then
1365 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1368 assert mtype
.need_anchor
1369 var u
= v
.anchor_to
(mtype
)
1370 if not u
isa MNullableType then
1371 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1377 redef class AParExpr
1378 redef fun accept_typing
(v
)
1380 self.mtype
= v
.visit_expr
(self.n_expr
)
1384 redef class AOnceExpr
1385 redef fun accept_typing
(v
)
1387 self.mtype
= v
.visit_expr
(self.n_expr
)
1391 redef class ASelfExpr
1392 redef var its_variable
: nullable Variable
1393 redef fun accept_typing
(v
)
1395 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1396 v
.error
(self, "Error: self cannot be used in top-level method.")
1398 var variable
= v
.selfvariable
1399 self.its_variable
= variable
1400 self.mtype
= v
.get_variable
(self, variable
)
1404 ## MESSAGE SENDING AND PROPERTY
1406 redef class ASendExpr
1407 # The property invoked by the send.
1408 var callsite
: nullable CallSite
1410 redef fun accept_typing
(v
)
1412 var recvtype
= v
.visit_expr
(self.n_expr
)
1413 var name
= self.property_name
1415 if recvtype
== null then return # Forward error
1417 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1418 if callsite
== null then return
1419 self.callsite
= callsite
1420 var msignature
= callsite
.msignature
1422 var args
= compute_raw_arguments
1424 callsite
.check_signature
(v
, args
)
1426 if callsite
.mproperty
.is_init
then
1427 var vmpropdef
= v
.mpropdef
1428 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1429 v
.error
(self, "Can call a init only in another init")
1431 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1432 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1436 var ret
= msignature
.return_mtype
1440 self.is_typed
= true
1444 # The name of the property
1445 # Each subclass simply provide the correct name.
1446 private fun property_name
: String is abstract
1448 # An array of all arguments (excluding self)
1449 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1451 private fun compute_raw_arguments
: Array[AExpr] is abstract
1454 redef class ABinopExpr
1455 redef fun compute_raw_arguments
do return [n_expr2
]
1458 redef fun property_name
do return "=="
1459 redef fun accept_typing
(v
)
1466 redef fun property_name
do return "!="
1467 redef fun accept_typing
(v
)
1474 redef fun property_name
do return "<"
1477 redef fun property_name
do return "<="
1480 redef fun property_name
do return "<<"
1483 redef fun property_name
do return ">"
1486 redef fun property_name
do return ">="
1489 redef fun property_name
do return ">>"
1491 redef class APlusExpr
1492 redef fun property_name
do return "+"
1494 redef class AMinusExpr
1495 redef fun property_name
do return "-"
1497 redef class AStarshipExpr
1498 redef fun property_name
do return "<=>"
1500 redef class AStarExpr
1501 redef fun property_name
do return "*"
1503 redef class AStarstarExpr
1504 redef fun property_name
do return "**"
1506 redef class ASlashExpr
1507 redef fun property_name
do return "/"
1509 redef class APercentExpr
1510 redef fun property_name
do return "%"
1513 redef class AUminusExpr
1514 redef fun property_name
do return "unary -"
1515 redef fun compute_raw_arguments
do return new Array[AExpr]
1519 redef class ACallExpr
1520 redef fun property_name
do return n_id
.text
1521 redef fun compute_raw_arguments
do return n_args
.to_a
1524 redef class ACallAssignExpr
1525 redef fun property_name
do return n_id
.text
+ "="
1526 redef fun compute_raw_arguments
1528 var res
= n_args
.to_a
1534 redef class ABraExpr
1535 redef fun property_name
do return "[]"
1536 redef fun compute_raw_arguments
do return n_args
.to_a
1539 redef class ABraAssignExpr
1540 redef fun property_name
do return "[]="
1541 redef fun compute_raw_arguments
1543 var res
= n_args
.to_a
1549 redef class ASendReassignFormExpr
1550 # The property invoked for the writing
1551 var write_callsite
: nullable CallSite
1553 redef fun accept_typing
(v
)
1555 var recvtype
= v
.visit_expr
(self.n_expr
)
1556 var name
= self.property_name
1558 if recvtype
== null then return # Forward error
1560 var for_self
= self.n_expr
isa ASelfExpr
1561 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1563 if callsite
== null then return
1564 self.callsite
= callsite
1566 var args
= compute_raw_arguments
1568 callsite
.check_signature
(v
, args
)
1570 var readtype
= callsite
.msignature
.return_mtype
1571 if readtype
== null then
1572 v
.error
(self, "Error: {name} is not a function")
1576 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1577 if wcallsite
== null then return
1578 self.write_callsite
= wcallsite
1580 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1581 if wtype
== null then return
1583 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1584 args
.add
(self.n_value
)
1585 wcallsite
.check_signature
(v
, args
)
1587 self.is_typed
= true
1591 redef class ACallReassignExpr
1592 redef fun property_name
do return n_id
.text
1593 redef fun compute_raw_arguments
do return n_args
.to_a
1596 redef class ABraReassignExpr
1597 redef fun property_name
do return "[]"
1598 redef fun compute_raw_arguments
do return n_args
.to_a
1601 redef class AInitExpr
1602 redef fun property_name
do return "init"
1603 redef fun compute_raw_arguments
do return n_args
.to_a
1607 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1612 redef class ASuperExpr
1613 # The method to call if the super is in fact a 'super init call'
1614 # Note: if the super is a normal call-next-method, then this attribute is null
1615 var callsite
: nullable CallSite
1617 # The method to call is the super is a standard `call-next-method` super-call
1618 # Note: if the super is a special super-init-call, then this attribute is null
1619 var mpropdef
: nullable MMethodDef
1621 redef fun accept_typing
(v
)
1623 var anchor
= v
.anchor
1624 assert anchor
!= null
1625 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1626 assert recvtype
!= null
1627 var mproperty
= v
.mpropdef
.mproperty
1628 if not mproperty
isa MMethod then
1629 v
.error
(self, "Error: super only usable in a method")
1632 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1633 if superprops
.length
== 0 then
1634 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1635 process_superinit
(v
)
1638 v
.error
(self, "Error: No super method to call for {mproperty}.")
1641 # FIXME: covariance of return type in linear extension?
1642 var superprop
= superprops
.first
1644 var msignature
= superprop
.msignature
.as(not null)
1645 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1646 var args
= self.n_args
.to_a
1647 if args
.length
> 0 then
1648 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1650 self.mtype
= msignature
.return_mtype
1651 self.is_typed
= true
1652 v
.mpropdef
.has_supercall
= true
1653 mpropdef
= v
.mpropdef
.as(MMethodDef)
1656 private fun process_superinit
(v
: TypeVisitor)
1658 var anchor
= v
.anchor
1659 assert anchor
!= null
1660 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1661 assert recvtype
!= null
1662 var mpropdef
= v
.mpropdef
1663 assert mpropdef
isa MMethodDef
1664 var mproperty
= mpropdef
.mproperty
1665 var superprop
: nullable MMethodDef = null
1666 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1667 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1668 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1669 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1670 if candidate
== null then
1671 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1672 continue # Try next super-class
1674 if superprop
!= null and candidate
.is_root_init
then
1677 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1678 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1681 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1682 if superprop
!= null and superprop
.mproperty
== candidate
then
1683 if superprop
== candidatedefs
.first
then continue
1684 candidatedefs
.add
(superprop
)
1686 if candidatedefs
.length
> 1 then
1687 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1690 superprop
= candidatedefs
.first
1692 if superprop
== null then
1693 v
.error
(self, "Error: No super method to call for {mproperty}.")
1697 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1698 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1700 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1701 self.callsite
= callsite
1703 var args
= self.n_args
.to_a
1704 if args
.length
> 0 then
1705 callsite
.check_signature
(v
, args
)
1707 # Check there is at least enough parameters
1708 if mpropdef
.msignature
.arity
< msignature
.arity
then
1709 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1712 # Check that each needed parameter is conform
1714 for sp
in msignature
.mparameters
do
1715 var p
= mpropdef
.msignature
.mparameters
[i
]
1716 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1717 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1724 self.is_typed
= true
1730 redef class ANewExpr
1731 # The constructor invoked by the new.
1732 var callsite
: nullable CallSite
1734 # The designated type
1735 var recvtype
: nullable MClassType
1737 redef fun accept_typing
(v
)
1739 var recvtype
= v
.resolve_mtype
(self.n_type
)
1740 if recvtype
== null then return
1742 if not recvtype
isa MClassType then
1743 if recvtype
isa MNullableType then
1744 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1747 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1752 self.recvtype
= recvtype
1761 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1762 if callsite
== null then return
1764 if not callsite
.mproperty
.is_new
then
1765 var kind
= recvtype
.mclass
.kind
1766 if kind
!= concrete_kind
then
1767 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1770 self.mtype
= recvtype
1772 self.mtype
= callsite
.msignature
.return_mtype
1773 assert self.mtype
!= null
1776 self.callsite
= callsite
1778 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1779 v
.error
(self, "Error: {name} is not a constructor.")
1783 var args
= n_args
.to_a
1784 callsite
.check_signature
(v
, args
)
1790 redef class AAttrFormExpr
1791 # The attribute acceded.
1792 var mproperty
: nullable MAttribute
1794 # The static type of the attribute.
1795 var attr_type
: nullable MType
1797 # Resolve the attribute acceded.
1798 private fun resolve_property
(v
: TypeVisitor)
1800 var recvtype
= v
.visit_expr
(self.n_expr
)
1801 if recvtype
== null then return # Skip error
1802 var name
= self.n_id
.text
1803 if recvtype
isa MNullType then
1804 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1808 var unsafe_type
= v
.anchor_to
(recvtype
)
1809 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1810 if mproperty
== null then
1811 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1814 assert mproperty
isa MAttribute
1815 self.mproperty
= mproperty
1817 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1818 assert mpropdefs
.length
== 1
1819 var mpropdef
= mpropdefs
.first
1820 var attr_type
= mpropdef
.static_mtype
.as(not null)
1821 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1822 self.attr_type
= attr_type
1826 redef class AAttrExpr
1827 redef fun accept_typing
(v
)
1829 self.resolve_property
(v
)
1830 self.mtype
= self.attr_type
1835 redef class AAttrAssignExpr
1836 redef fun accept_typing
(v
)
1838 self.resolve_property
(v
)
1839 var mtype
= self.attr_type
1841 v
.visit_expr_subtype
(self.n_value
, mtype
)
1842 self.is_typed
= true
1846 redef class AAttrReassignExpr
1847 redef fun accept_typing
(v
)
1849 self.resolve_property
(v
)
1850 var mtype
= self.attr_type
1851 if mtype
== null then return # Skip error
1853 self.resolve_reassignment
(v
, mtype
, mtype
)
1855 self.is_typed
= true
1859 redef class AIssetAttrExpr
1860 redef fun accept_typing
(v
)
1862 self.resolve_property
(v
)
1863 var mtype
= self.attr_type
1864 if mtype
== null then return # Skip error
1866 var recvtype
= self.n_expr
.mtype
.as(not null)
1867 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1868 if bound
isa MNullableType then
1869 v
.error
(self, "Error: isset on a nullable attribute.")
1871 self.mtype
= v
.type_bool
(self)
1875 redef class AVarargExpr
1876 redef fun accept_typing
(v
)
1878 # This kind of pseudo-expression can be only processed trough a signature
1879 # See `check_signature`
1880 # Other cases are a syntax error.
1881 v
.error
(self, "Syntax error: unexpected `...`")
1887 redef class ADebugTypeExpr
1888 redef fun accept_typing
(v
)
1890 var expr
= v
.visit_expr
(self.n_expr
)
1891 if expr
== null then return
1892 var unsafe
= v
.anchor_to
(expr
)
1893 var ntype
= self.n_type
1894 var mtype
= v
.resolve_mtype
(ntype
)
1895 if mtype
!= null and mtype
!= expr
then
1896 var umtype
= v
.anchor_to
(mtype
)
1897 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1899 self.is_typed
= true