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
44 # The analyzed mclassdef
45 var mclassdef
: nullable MClassDef
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
57 init(modelbuilder
: ModelBuilder, mmodule
: MModule, mpropdef
: nullable MPropDef)
59 self.modelbuilder
= modelbuilder
60 self.mmodule
= mmodule
62 if mpropdef
!= null then
63 self.mpropdef
= mpropdef
64 var mclassdef
= mpropdef
.mclassdef
65 self.mclassdef
= mclassdef
66 self.anchor
= mclassdef
.bound_mtype
68 var mclass
= mclassdef
.mclass
70 var selfvariable
= new Variable("self")
71 self.selfvariable
= selfvariable
72 selfvariable
.declared_type
= mclass
.mclass_type
74 var mprop
= mpropdef
.mproperty
75 if mprop
isa MMethod and mprop
.is_toplevel
then
76 is_toplevel_context
= true
81 fun anchor_to
(mtype
: MType): MType
84 if anchor
== null then
85 assert not mtype
.need_anchor
88 return mtype
.anchor_to
(mmodule
, anchor
)
91 fun is_subtype
(sub
, sup
: MType): Bool
93 return sub
.is_subtype
(mmodule
, anchor
, sup
)
96 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
98 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
99 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
103 # Check that `sub` is a subtype of `sup`.
104 # If `sub` is not a valid suptype, then display an error on `node` an return null.
105 # If `sub` is a safe subtype of `sup` then return `sub`.
106 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
108 # The point of the return type is to determinate the usable type on an expression:
109 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
110 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
111 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
113 if self.is_subtype
(sub
, sup
) then return sub
114 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
115 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
116 #node.debug("Unsafe typing: expected {sup}, got {sub}")
119 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
123 # Visit an expression and do not care about the return value
124 fun visit_stmt
(nexpr
: nullable AExpr)
126 if nexpr
== null then return
127 nexpr
.accept_typing
(self)
130 # Visit an expression and expects that it is not a statement
131 # Return the type of the expression
132 # Display an error and return null if:
133 # * the type cannot be determined or
134 # * `nexpr` is a statement
135 fun visit_expr
(nexpr
: AExpr): nullable MType
137 nexpr
.accept_typing
(self)
138 var mtype
= nexpr
.mtype
139 if mtype
!= null then return mtype
140 if not nexpr
.is_typed
then
141 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
142 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
143 nexpr
.debug
("No return type but no error.")
146 return null # forward error
148 self.error
(nexpr
, "Type error: expected expression.")
152 # Visit an expression and expect its static type is a least a `sup`
153 # Return the type of the expression or null if
154 # * the type cannot be determined or
155 # * `nexpr` is a statement or
156 # * `nexpr` is not a `sup`
157 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
159 var sub
= visit_expr
(nexpr
)
160 if sub
== null then return null # Forward error
162 if sup
== null then return null # Forward error
164 var res
= check_subtype
(nexpr
, sub
, sup
)
166 nexpr
.implicit_cast_to
= res
171 # Visit an expression and expect its static type is a `Bool`
172 # Return the type of the expression or null if
173 # * the type cannot be determined or
174 # * `nexpr` is a statement or
175 # * `nexpr` is not a `Bool`
176 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
178 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
182 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
184 var sub
= visit_expr
(nexpr
)
185 if sub
== null then return null # Forward error
187 var sup
= self.resolve_mtype
(ntype
)
188 if sup
== null then return null # Forward error
191 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup}.")
192 else if self.is_subtype
(sub
, sup
) then
193 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup} since it is a {sub}.")
198 # Special verification on != and == for null
200 fun null_test
(anode
: ABinopExpr)
202 var mtype
= anode
.n_expr
.mtype
203 var mtype2
= anode
.n_expr2
.mtype
205 if mtype
== null or mtype2
== null then return
207 if not mtype2
isa MNullType then return
209 # Check of useless null
210 if not mtype
isa MNullableType then
211 if not anchor_to
(mtype
) isa MNullableType then
212 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
217 # Check for type adaptation
218 var variable
= anode
.n_expr
.its_variable
219 if variable
== null then return
221 if anode
isa AEqExpr then
222 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
223 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
.mtype
)
224 else if anode
isa ANeExpr then
225 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
226 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
.mtype
)
232 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
234 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
237 fun resolve_mtype
(node
: AType): nullable MType
239 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
242 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
244 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
248 fun get_mclass
(node
: ANode, name
: String): nullable MClass
250 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
251 if mclass
== null then
252 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
257 fun type_bool
(node
: ANode): nullable MType
259 var mclass
= self.get_mclass
(node
, "Bool")
260 if mclass
== null then return null
261 return mclass
.mclass_type
264 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
266 var unsafe_type
= self.anchor_to
(recvtype
)
268 #debug("recv: {recvtype} (aka {unsafe_type})")
269 if recvtype
isa MNullType then
270 self.error
(node
, "Error: Method '{name}' call on 'null'.")
274 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
275 if name
== "new" and mproperty
== null then
277 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
280 if mproperty
== null then
281 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
283 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
285 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
290 assert mproperty
isa MMethod
292 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
293 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
295 if not recv_is_self
and mproperty
.is_toplevel
then
296 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
299 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
300 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
304 var info
= mproperty
.deprecation
305 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
308 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
310 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
314 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
316 if propdefs
.length
== 0 then
317 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
319 else if propdefs
.length
== 1 then
320 mpropdef
= propdefs
.first
322 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
323 mpropdef
= mproperty
.intro
327 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
328 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
330 var erasure_cast
= false
331 var rettype
= mpropdef
.msignature
.return_mtype
332 if not recv_is_self
and rettype
!= null then
333 rettype
= rettype
.as_notnullable
334 if rettype
isa MParameterType then
335 var erased_rettype
= msignature
.return_mtype
336 assert erased_rettype
!= null
337 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
342 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
346 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
348 var unsafe_type
= self.anchor_to
(recvtype
)
349 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
350 if mproperty
== null then return null
351 return get_method
(node
, recvtype
, name
, recv_is_self
)
355 # Visit the expressions of args and check their conformity with the corresponding type in signature
356 # The point of this method is to handle varargs correctly
357 # Note: The signature must be correctly adapted
358 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
360 var vararg_rank
= msignature
.vararg_rank
361 if vararg_rank
>= 0 then
362 if args
.length
< msignature
.arity
then
363 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
364 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
367 else if args
.length
!= msignature
.arity
then
368 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
372 #debug("CALL {unsafe_type}.{msignature}")
374 var vararg_decl
= args
.length
- msignature
.arity
375 for i
in [0..msignature
.arity
[ do
377 if i
== vararg_rank
then continue # skip the vararg
378 if i
> vararg_rank
then
381 var paramtype
= msignature
.mparameters
[i
].mtype
382 self.visit_expr_subtype
(args
[j
], paramtype
)
384 if vararg_rank
>= 0 then
385 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
386 var first
= args
[vararg_rank
]
387 if vararg_decl
== 0 and first
isa AVarargExpr then
388 var mclass
= get_mclass
(node
, "Array")
389 if mclass
== null then return false # Forward error
390 var array_mtype
= mclass
.get_mtype
([paramtype
])
391 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
392 first
.mtype
= first
.n_expr
.mtype
394 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
395 self.visit_expr_subtype
(args
[j
], paramtype
)
402 fun error
(node
: ANode, message
: String)
404 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
407 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
409 var flow
= node
.after_flow_context
411 self.error
(node
, "No context!")
415 if flow
.vars
.has_key
(variable
) then
416 return flow
.vars
[variable
]
418 #node.debug("*** START Collected for {variable}")
419 var mtypes
= flow
.collect_types
(variable
)
420 #node.debug("**** END Collected for {variable}")
421 if mtypes
== null or mtypes
.length
== 0 then
422 return variable
.declared_type
423 else if mtypes
.length
== 1 then
426 var res
= merge_types
(node
,mtypes
)
427 if res
== null then res
= variable
.declared_type
433 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
435 var flow
= node
.after_flow_context
438 flow
.set_var
(variable
, mtype
)
441 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
443 if col
.length
== 1 then return col
.first
445 if t1
== null then continue # return null
448 if t2
== null then continue # return null
449 if t2
isa MNullableType or t2
isa MNullType then
452 if not is_subtype
(t2
, t1
) then found
= false
455 #print "merge {col.join(" ")} -> {t1}"
459 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
464 # A specific method call site with its associated informations.
466 # The associated node for location
469 # The static type of the receiver (possibly unresolved)
472 # The module where the callsite is present
475 # The anchor to use with `recv` or `msignature`
476 var anchor
: nullable MClassType
478 # Is the receiver self?
479 # If "for_self", virtual types of the signature are kept
480 # If "not_for_self", virtual type are erased
481 var recv_is_self
: Bool
483 # The designated method
484 var mproperty
: MMethod
486 # The statically designated method definition
487 # The most specif one, it is.
488 var mpropdef
: MMethodDef
490 # The resolved signature for the receiver
491 var msignature
: MSignature
493 # Is a implicit cast required on erasure typing policy?
494 var erasure_cast
: Bool
496 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
498 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
503 # The declared type of the variable
504 var declared_type
: nullable MType
507 redef class FlowContext
508 # Store changes of types because of type evolution
509 private var vars
= new HashMap[Variable, nullable MType]
510 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
512 # Adapt the variable to a static type
513 # Warning1: do not modify vars directly.
514 # Warning2: sub-flow may have cached a unadapted variable
515 private fun set_var
(variable
: Variable, mtype
: nullable MType)
517 self.vars
[variable
] = mtype
518 self.cache
.keys
.remove
(variable
)
521 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
523 if cache
.has_key
(variable
) then
524 return cache
[variable
]
526 var res
: nullable Array[nullable MType] = null
527 if vars
.has_key
(variable
) then
528 var mtype
= vars
[variable
]
530 else if self.previous
.is_empty
then
532 res
= [variable
.declared_type
]
534 for flow
in self.previous
do
535 if flow
.is_unreachable
then continue
536 var r2
= flow
.collect_types
(variable
)
537 if r2
== null then continue
542 if not res
.has
(t
) then res
.add
(t
)
547 cache
[variable
] = res
553 # The entry point of the whole typing analysis
554 fun do_typing
(modelbuilder
: ModelBuilder)
558 # The variable associated to the receiver (if any)
559 var selfvariable
: nullable Variable
562 redef class AMethPropdef
563 redef fun do_typing
(modelbuilder
: ModelBuilder)
565 var nblock
= self.n_block
566 if nblock
== null then return
568 var mpropdef
= self.mpropdef
.as(not null)
569 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
570 self.selfvariable
= v
.selfvariable
572 var mmethoddef
= self.mpropdef
.as(not null)
573 for i
in [0..mmethoddef
.msignature
.arity
[ do
574 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
575 if mmethoddef
.msignature
.vararg_rank
== i
then
576 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
577 if arrayclass
== null then return # Skip error
578 mtype
= arrayclass
.get_mtype
([mtype
])
580 var variable
= self.n_signature
.n_params
[i
].variable
581 assert variable
!= null
582 variable
.declared_type
= mtype
586 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
587 # We reach the end of the function without having a return, it is bad
588 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
593 redef class AAttrPropdef
594 redef fun do_typing
(modelbuilder
: ModelBuilder)
596 var mpropdef
= self.mpropdef
.as(not null)
597 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
598 self.selfvariable
= v
.selfvariable
600 var nexpr
= self.n_expr
601 if nexpr
!= null then
602 var mtype
= self.mpropdef
.static_mtype
603 v
.visit_expr_subtype
(nexpr
, mtype
)
611 # The static type of the expression.
612 # null if self is a statement or in case of error
613 var mtype
: nullable MType = null
615 # Is the statement correctly typed?
616 # Used to distinguish errors and statements when `mtype == null`
617 var is_typed
: Bool = false
619 # If required, the following implicit cast `.as(XXX)`
620 # Such a cast may by required after evaluating the expression when
621 # a unsafe operation is detected (silently accepted by the Nit language).
622 # The attribute is computed by `check_subtype`
623 var implicit_cast_to
: nullable MType = null
625 # Return the variable read (if any)
626 # Used to perform adaptive typing
627 fun its_variable
: nullable Variable do return null
629 private fun accept_typing
(v
: TypeVisitor)
631 v
.error
(self, "no implemented accept_typing for {self.class_name}")
635 redef class ABlockExpr
636 redef fun accept_typing
(v
)
638 for e
in self.n_expr
do v
.visit_stmt
(e
)
642 # The type of a blockexpr is the one of the last expression (or null if empty)
645 if self.n_expr
.is_empty
then return null
646 return self.n_expr
.last
.mtype
650 redef class AVardeclExpr
651 redef fun accept_typing
(v
)
653 var variable
= self.variable
654 if variable
== null then return # Skip error
656 var ntype
= self.n_type
657 var mtype
: nullable MType
658 if ntype
== null then
661 mtype
= v
.resolve_mtype
(ntype
)
662 if mtype
== null then return # Skip error
665 var nexpr
= self.n_expr
666 if nexpr
!= null then
667 if mtype
!= null then
668 v
.visit_expr_subtype
(nexpr
, mtype
)
670 mtype
= v
.visit_expr
(nexpr
)
671 if mtype
== null then return # Skip error
676 if mtype
== null or mtype
isa MNullType then
677 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
678 if mtype
== null then mtype
= decltype
681 variable
.declared_type
= decltype
682 v
.set_variable
(self, variable
, mtype
)
684 #debug("var {variable}: {mtype}")
691 redef fun its_variable
do return self.variable
692 redef fun accept_typing
(v
)
694 var variable
= self.variable
695 if variable
== null then return # Skip error
697 var mtype
= v
.get_variable
(self, variable
)
698 if mtype
!= null then
699 #debug("{variable} is {mtype}")
701 #debug("{variable} is untyped")
708 redef class AVarAssignExpr
709 redef fun accept_typing
(v
)
711 var variable
= self.variable
712 assert variable
!= null
714 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
716 v
.set_variable
(self, variable
, mtype
)
722 redef class AReassignFormExpr
723 # The method designed by the reassign operator.
724 var reassign_callsite
: nullable CallSite
726 var read_type
: nullable MType = null
728 # Determine the `reassign_property`
729 # `readtype` is the type of the reading of the left value.
730 # `writetype` is the type of the writing of the left value.
731 # (Because of `ACallReassignExpr`, both can be different.
732 # Return the static type of the value to store.
733 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
735 var reassign_name
: String
736 if self.n_assign_op
isa APlusAssignOp then
738 else if self.n_assign_op
isa AMinusAssignOp then
744 self.read_type
= readtype
746 if readtype
isa MNullType then
747 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
751 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
752 if callsite
== null then return null # Skip error
753 self.reassign_callsite
= callsite
755 var msignature
= callsite
.msignature
756 var rettype
= msignature
.return_mtype
757 assert msignature
.arity
== 1 and rettype
!= null
759 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
760 if value_type
== null then return null # Skip error
762 v
.check_subtype
(self, rettype
, writetype
)
767 redef class AVarReassignExpr
768 redef fun accept_typing
(v
)
770 var variable
= self.variable
771 assert variable
!= null
773 var readtype
= v
.get_variable
(self, variable
)
774 if readtype
== null then return
778 var writetype
= variable
.declared_type
779 if writetype
== null then return
781 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
783 v
.set_variable
(self, variable
, rettype
)
790 redef class AContinueExpr
791 redef fun accept_typing
(v
)
793 var nexpr
= self.n_expr
794 if nexpr
!= null then
801 redef class ABreakExpr
802 redef fun accept_typing
(v
)
804 var nexpr
= self.n_expr
805 if nexpr
!= null then
812 redef class AReturnExpr
813 redef fun accept_typing
(v
)
815 var nexpr
= self.n_expr
816 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
817 if nexpr
!= null then
818 if ret_type
!= null then
819 v
.visit_expr_subtype
(nexpr
, ret_type
)
822 v
.error
(self, "Error: Return with value in a procedure.")
824 else if ret_type
!= null then
825 v
.error
(self, "Error: Return without value in a function.")
831 redef class AAbortExpr
832 redef fun accept_typing
(v
)
839 redef fun accept_typing
(v
)
841 v
.visit_expr_bool
(n_expr
)
849 redef class AIfexprExpr
850 redef fun accept_typing
(v
)
852 v
.visit_expr_bool
(n_expr
)
854 var t1
= v
.visit_expr
(n_then
)
855 var t2
= v
.visit_expr
(n_else
)
857 if t1
== null or t2
== null then
861 var t
= v
.merge_types
(self, [t1
, t2
])
863 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
870 redef fun accept_typing
(v
)
872 v
.visit_stmt
(n_block
)
877 redef class AWhileExpr
878 redef fun accept_typing
(v
)
880 v
.visit_expr_bool
(n_expr
)
882 v
.visit_stmt
(n_block
)
887 redef class ALoopExpr
888 redef fun accept_typing
(v
)
890 v
.visit_stmt
(n_block
)
896 var coltype
: nullable MClassType
898 var method_iterator
: nullable CallSite
899 var method_is_ok
: nullable CallSite
900 var method_item
: nullable CallSite
901 var method_next
: nullable CallSite
902 var method_key
: nullable CallSite
903 var method_finish
: nullable CallSite
905 var method_lt
: nullable CallSite
906 var method_successor
: nullable CallSite
908 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
910 if mtype
isa MNullType then
911 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
916 var objcla
= v
.get_mclass
(self, "Object")
917 if objcla
== null then return
919 # check iterator method
920 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
921 if itdef
== null then
922 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
925 self.method_iterator
= itdef
927 # check that iterator return something
928 var ittype
= itdef
.msignature
.return_mtype
929 if ittype
== null then
930 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
935 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
936 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
940 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
942 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
943 var variables
= self.variables
944 if variables
.length
!= 1 then
945 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
947 variables
.first
.declared_type
= coltype
.arguments
.first
952 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
954 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
955 var variables
= self.variables
956 if variables
.length
!= 2 then
957 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
959 variables
[0].declared_type
= coltype
.arguments
[0]
960 variables
[1].declared_type
= coltype
.arguments
[1]
965 if not is_col
and not is_map
then
966 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
970 # anchor formal and virtual types
971 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
973 mtype
= mtype
.as_notnullable
974 self.coltype
= mtype
.as(MClassType)
976 # get methods is_ok, next, item
977 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
978 if ikdef
== null then
979 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
982 self.method_is_ok
= ikdef
984 var itemdef
= v
.get_method
(self, ittype
, "item", false)
985 if itemdef
== null then
986 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
989 self.method_item
= itemdef
991 var nextdef
= v
.get_method
(self, ittype
, "next", false)
992 if nextdef
== null then
993 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
996 self.method_next
= nextdef
998 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1001 var keydef
= v
.get_method
(self, ittype
, "key", false)
1002 if keydef
== null then
1003 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1006 self.method_key
= keydef
1009 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1010 var variable
= variables
.first
1011 var vtype
= variable
.declared_type
.as(not null)
1013 if n_expr
isa AOrangeExpr then
1014 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1016 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1019 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1023 redef fun accept_typing
(v
)
1025 var mtype
= v
.visit_expr
(n_expr
)
1026 if mtype
== null then return
1028 self.do_type_iterator
(v
, mtype
)
1030 v
.visit_stmt
(n_block
)
1031 self.is_typed
= true
1035 redef class AAssertExpr
1036 redef fun accept_typing
(v
)
1038 v
.visit_expr_bool
(n_expr
)
1040 v
.visit_stmt
(n_else
)
1041 self.is_typed
= true
1046 redef fun accept_typing
(v
)
1048 v
.visit_expr_bool
(n_expr
)
1049 v
.visit_expr_bool
(n_expr2
)
1050 self.mtype
= v
.type_bool
(self)
1054 redef class AImpliesExpr
1055 redef fun accept_typing
(v
)
1057 v
.visit_expr_bool
(n_expr
)
1058 v
.visit_expr_bool
(n_expr2
)
1059 self.mtype
= v
.type_bool
(self)
1063 redef class AAndExpr
1064 redef fun accept_typing
(v
)
1066 v
.visit_expr_bool
(n_expr
)
1067 v
.visit_expr_bool
(n_expr2
)
1068 self.mtype
= v
.type_bool
(self)
1073 redef class ANotExpr
1074 redef fun accept_typing
(v
)
1076 v
.visit_expr_bool
(n_expr
)
1077 self.mtype
= v
.type_bool
(self)
1081 redef class AOrElseExpr
1082 redef fun accept_typing
(v
)
1084 var t1
= v
.visit_expr
(n_expr
)
1085 var t2
= v
.visit_expr
(n_expr2
)
1087 if t1
== null or t2
== null then
1091 t1
= t1
.as_notnullable
1093 var t
= v
.merge_types
(self, [t1
, t2
])
1095 t
= v
.mmodule
.object_type
1096 if t2
isa MNullableType then
1099 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1105 redef class ATrueExpr
1106 redef fun accept_typing
(v
)
1108 self.mtype
= v
.type_bool
(self)
1112 redef class AFalseExpr
1113 redef fun accept_typing
(v
)
1115 self.mtype
= v
.type_bool
(self)
1119 redef class AIntExpr
1120 redef fun accept_typing
(v
)
1122 var mclass
= v
.get_mclass
(self, "Int")
1123 if mclass
== null then return # Forward error
1124 self.mtype
= mclass
.mclass_type
1128 redef class AFloatExpr
1129 redef fun accept_typing
(v
)
1131 var mclass
= v
.get_mclass
(self, "Float")
1132 if mclass
== null then return # Forward error
1133 self.mtype
= mclass
.mclass_type
1137 redef class ACharExpr
1138 redef fun accept_typing
(v
)
1140 var mclass
= v
.get_mclass
(self, "Char")
1141 if mclass
== null then return # Forward error
1142 self.mtype
= mclass
.mclass_type
1146 redef class AStringFormExpr
1147 redef fun accept_typing
(v
)
1149 var mclass
= v
.get_mclass
(self, "String")
1150 if mclass
== null then return # Forward error
1151 self.mtype
= mclass
.mclass_type
1155 redef class ASuperstringExpr
1156 redef fun accept_typing
(v
)
1158 var mclass
= v
.get_mclass
(self, "String")
1159 if mclass
== null then return # Forward error
1160 self.mtype
= mclass
.mclass_type
1161 for nexpr
in self.n_exprs
do
1162 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1167 redef class AArrayExpr
1168 var with_capacity_callsite
: nullable CallSite
1169 var push_callsite
: nullable CallSite
1171 redef fun accept_typing
(v
)
1173 var mtype
: nullable MType = null
1174 var ntype
= self.n_type
1175 if ntype
!= null then
1176 mtype
= v
.resolve_mtype
(ntype
)
1177 if mtype
== null then return # Skip error
1179 var mtypes
= new Array[nullable MType]
1181 for e
in self.n_exprs
.n_exprs
do
1182 var t
= v
.visit_expr
(e
)
1186 if mtype
!= null then
1187 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1188 if t
== mtype
then useless
= true
1193 if mtype
== null then
1194 mtype
= v
.merge_types
(self, mtypes
)
1196 if mtype
== null then
1197 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1201 assert ntype
!= null
1202 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1204 var mclass
= v
.get_mclass
(self, "Array")
1205 if mclass
== null then return # Forward error
1206 var array_mtype
= mclass
.get_mtype
([mtype
])
1208 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1209 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1211 self.mtype
= array_mtype
1215 redef class ARangeExpr
1216 var init_callsite
: nullable CallSite
1218 redef fun accept_typing
(v
)
1220 var discrete_class
= v
.get_mclass
(self, "Discrete")
1221 if discrete_class
== null then return # Forward error
1222 var discrete_type
= discrete_class
.intro
.bound_mtype
1223 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1224 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1225 if t1
== null or t2
== null then return
1226 var mclass
= v
.get_mclass
(self, "Range")
1227 if mclass
== null then return # Forward error
1229 if v
.is_subtype
(t1
, t2
) then
1230 mtype
= mclass
.get_mtype
([t2
])
1231 else if v
.is_subtype
(t2
, t1
) then
1232 mtype
= mclass
.get_mtype
([t1
])
1234 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1240 # get the constructor
1242 if self isa ACrangeExpr then
1243 callsite
= v
.get_method
(self, mtype
, "init", false)
1244 else if self isa AOrangeExpr then
1245 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1249 init_callsite
= callsite
1253 redef class ANullExpr
1254 redef fun accept_typing
(v
)
1256 self.mtype
= v
.mmodule
.model
.null_type
1260 redef class AIsaExpr
1261 # The static type to cast to.
1262 # (different from the static type of the expression that is `Bool`).
1263 var cast_type
: nullable MType
1264 redef fun accept_typing
(v
)
1266 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1267 self.cast_type
= mtype
1269 var variable
= self.n_expr
.its_variable
1270 if variable
!= null then
1271 #var orig = self.n_expr.mtype
1272 #var from = if orig != null then orig.to_s else "invalid"
1273 #var to = if mtype != null then mtype.to_s else "invalid"
1274 #debug("adapt {variable}: {from} -> {to}")
1275 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1278 self.mtype
= v
.type_bool
(self)
1282 redef class AAsCastExpr
1283 redef fun accept_typing
(v
)
1285 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1289 redef class AAsNotnullExpr
1290 redef fun accept_typing
(v
)
1292 var mtype
= v
.visit_expr
(self.n_expr
)
1293 if mtype
== null then return # Forward error
1295 if mtype
isa MNullType then
1296 v
.error
(self, "Type error: as(not null) on null")
1299 if mtype
isa MNullableType then
1300 self.mtype
= mtype
.mtype
1305 if mtype
isa MClassType then
1306 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1309 assert mtype
.need_anchor
1310 var u
= v
.anchor_to
(mtype
)
1311 if not u
isa MNullableType then
1312 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1318 redef class AParExpr
1319 redef fun accept_typing
(v
)
1321 self.mtype
= v
.visit_expr
(self.n_expr
)
1325 redef class AOnceExpr
1326 redef fun accept_typing
(v
)
1328 self.mtype
= v
.visit_expr
(self.n_expr
)
1332 redef class ASelfExpr
1333 redef var its_variable
: nullable Variable
1334 redef fun accept_typing
(v
)
1336 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1337 v
.error
(self, "Error: self cannot be used in top-level method.")
1339 var variable
= v
.selfvariable
1340 self.its_variable
= variable
1341 self.mtype
= v
.get_variable
(self, variable
)
1345 ## MESSAGE SENDING AND PROPERTY
1347 redef class ASendExpr
1348 # The property invoked by the send.
1349 var callsite
: nullable CallSite
1351 redef fun accept_typing
(v
)
1353 var recvtype
= v
.visit_expr
(self.n_expr
)
1354 var name
= self.property_name
1356 if recvtype
== null then return # Forward error
1357 if recvtype
isa MNullType then
1358 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1362 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1363 if callsite
== null then return
1364 self.callsite
= callsite
1365 var msignature
= callsite
.msignature
1367 var args
= compute_raw_arguments
1369 callsite
.check_signature
(v
, args
)
1371 if callsite
.mproperty
.is_init
then
1372 var vmpropdef
= v
.mpropdef
1373 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1374 v
.error
(self, "Can call a init only in another init")
1376 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1377 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1381 var ret
= msignature
.return_mtype
1385 self.is_typed
= true
1389 # The name of the property
1390 # Each subclass simply provide the correct name.
1391 private fun property_name
: String is abstract
1393 # An array of all arguments (excluding self)
1394 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1396 private fun compute_raw_arguments
: Array[AExpr] is abstract
1399 redef class ABinopExpr
1400 redef fun compute_raw_arguments
do return [n_expr2
]
1403 redef fun property_name
do return "=="
1404 redef fun accept_typing
(v
)
1411 redef fun property_name
do return "!="
1412 redef fun accept_typing
(v
)
1419 redef fun property_name
do return "<"
1422 redef fun property_name
do return "<="
1425 redef fun property_name
do return "<<"
1428 redef fun property_name
do return ">"
1431 redef fun property_name
do return ">="
1434 redef fun property_name
do return ">>"
1436 redef class APlusExpr
1437 redef fun property_name
do return "+"
1439 redef class AMinusExpr
1440 redef fun property_name
do return "-"
1442 redef class AStarshipExpr
1443 redef fun property_name
do return "<=>"
1445 redef class AStarExpr
1446 redef fun property_name
do return "*"
1448 redef class AStarstarExpr
1449 redef fun property_name
do return "**"
1451 redef class ASlashExpr
1452 redef fun property_name
do return "/"
1454 redef class APercentExpr
1455 redef fun property_name
do return "%"
1458 redef class AUminusExpr
1459 redef fun property_name
do return "unary -"
1460 redef fun compute_raw_arguments
do return new Array[AExpr]
1464 redef class ACallExpr
1465 redef fun property_name
do return n_id
.text
1466 redef fun compute_raw_arguments
do return n_args
.to_a
1469 redef class ACallAssignExpr
1470 redef fun property_name
do return n_id
.text
+ "="
1471 redef fun compute_raw_arguments
1473 var res
= n_args
.to_a
1479 redef class ABraExpr
1480 redef fun property_name
do return "[]"
1481 redef fun compute_raw_arguments
do return n_args
.to_a
1484 redef class ABraAssignExpr
1485 redef fun property_name
do return "[]="
1486 redef fun compute_raw_arguments
1488 var res
= n_args
.to_a
1494 redef class ASendReassignFormExpr
1495 # The property invoked for the writing
1496 var write_callsite
: nullable CallSite
1498 redef fun accept_typing
(v
)
1500 var recvtype
= v
.visit_expr
(self.n_expr
)
1501 var name
= self.property_name
1503 if recvtype
== null then return # Forward error
1504 if recvtype
isa MNullType then
1505 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1509 var for_self
= self.n_expr
isa ASelfExpr
1510 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1512 if callsite
== null then return
1513 self.callsite
= callsite
1515 var args
= compute_raw_arguments
1517 callsite
.check_signature
(v
, args
)
1519 var readtype
= callsite
.msignature
.return_mtype
1520 if readtype
== null then
1521 v
.error
(self, "Error: {name} is not a function")
1525 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1526 if wcallsite
== null then return
1527 self.write_callsite
= wcallsite
1529 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1530 if wtype
== null then return
1532 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1533 args
.add
(self.n_value
)
1534 wcallsite
.check_signature
(v
, args
)
1536 self.is_typed
= true
1540 redef class ACallReassignExpr
1541 redef fun property_name
do return n_id
.text
1542 redef fun compute_raw_arguments
do return n_args
.to_a
1545 redef class ABraReassignExpr
1546 redef fun property_name
do return "[]"
1547 redef fun compute_raw_arguments
do return n_args
.to_a
1550 redef class AInitExpr
1551 redef fun property_name
do return "init"
1552 redef fun compute_raw_arguments
do return n_args
.to_a
1556 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1561 redef class ASuperExpr
1562 # The method to call if the super is in fact a 'super init call'
1563 # Note: if the super is a normal call-next-method, then this attribute is null
1564 var callsite
: nullable CallSite
1566 # The method to call is the super is a standard `call-next-method` super-call
1567 # Note: if the super is a special super-init-call, then this attribute is null
1568 var mpropdef
: nullable MMethodDef
1570 redef fun accept_typing
(v
)
1572 var anchor
= v
.anchor
1573 assert anchor
!= null
1574 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1575 assert recvtype
!= null
1576 var mproperty
= v
.mpropdef
.mproperty
1577 if not mproperty
isa MMethod then
1578 v
.error
(self, "Error: super only usable in a method")
1581 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1582 if superprops
.length
== 0 then
1583 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1584 process_superinit
(v
)
1587 v
.error
(self, "Error: No super method to call for {mproperty}.")
1590 # FIXME: covariance of return type in linear extension?
1591 var superprop
= superprops
.first
1593 var msignature
= superprop
.msignature
.as(not null)
1594 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1595 var args
= self.n_args
.to_a
1596 if args
.length
> 0 then
1597 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1599 self.mtype
= msignature
.return_mtype
1600 self.is_typed
= true
1601 v
.mpropdef
.has_supercall
= true
1602 mpropdef
= v
.mpropdef
.as(MMethodDef)
1605 private fun process_superinit
(v
: TypeVisitor)
1607 var anchor
= v
.anchor
1608 assert anchor
!= null
1609 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1610 assert recvtype
!= null
1611 var mpropdef
= v
.mpropdef
1612 assert mpropdef
isa MMethodDef
1613 var mproperty
= mpropdef
.mproperty
1614 var superprop
: nullable MMethodDef = null
1615 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1616 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1617 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1618 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1619 if candidate
== null then
1620 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1621 continue # Try next super-class
1623 if superprop
!= null and candidate
.is_root_init
then
1626 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1627 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1630 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1631 if superprop
!= null and superprop
.mproperty
== candidate
then
1632 if superprop
== candidatedefs
.first
then continue
1633 candidatedefs
.add
(superprop
)
1635 if candidatedefs
.length
> 1 then
1636 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1639 superprop
= candidatedefs
.first
1641 if superprop
== null then
1642 v
.error
(self, "Error: No super method to call for {mproperty}.")
1646 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1647 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1649 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1650 self.callsite
= callsite
1652 var args
= self.n_args
.to_a
1653 if args
.length
> 0 then
1654 callsite
.check_signature
(v
, args
)
1656 # Check there is at least enough parameters
1657 if mpropdef
.msignature
.arity
< msignature
.arity
then
1658 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1661 # Check that each needed parameter is conform
1663 for sp
in msignature
.mparameters
do
1664 var p
= mpropdef
.msignature
.mparameters
[i
]
1665 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1666 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1673 self.is_typed
= true
1679 redef class ANewExpr
1680 # The constructor invoked by the new.
1681 var callsite
: nullable CallSite
1683 # The designated type
1684 var recvtype
: nullable MClassType
1686 redef fun accept_typing
(v
)
1688 var recvtype
= v
.resolve_mtype
(self.n_type
)
1689 if recvtype
== null then return
1691 if not recvtype
isa MClassType then
1692 if recvtype
isa MNullableType then
1693 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1696 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1700 if recvtype
.mclass
.kind
== abstract_kind
then
1701 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1703 else if recvtype
.mclass
.kind
== interface_kind
then
1704 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1709 self.recvtype
= recvtype
1718 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1719 if callsite
== null then return
1721 if not callsite
.mproperty
.is_new
then
1722 self.mtype
= recvtype
1724 self.mtype
= callsite
.msignature
.return_mtype
1725 assert self.mtype
!= null
1728 self.callsite
= callsite
1730 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1731 v
.error
(self, "Error: {name} is not a constructor.")
1735 var args
= n_args
.to_a
1736 callsite
.check_signature
(v
, args
)
1742 redef class AAttrFormExpr
1743 # The attribute acceded.
1744 var mproperty
: nullable MAttribute
1746 # The static type of the attribute.
1747 var attr_type
: nullable MType
1749 # Resolve the attribute acceded.
1750 private fun resolve_property
(v
: TypeVisitor)
1752 var recvtype
= v
.visit_expr
(self.n_expr
)
1753 if recvtype
== null then return # Skip error
1754 var name
= self.n_id
.text
1755 if recvtype
isa MNullType then
1756 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1760 var unsafe_type
= v
.anchor_to
(recvtype
)
1761 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1762 if mproperty
== null then
1763 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1766 assert mproperty
isa MAttribute
1767 self.mproperty
= mproperty
1769 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1770 assert mpropdefs
.length
== 1
1771 var mpropdef
= mpropdefs
.first
1772 var attr_type
= mpropdef
.static_mtype
.as(not null)
1773 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1774 self.attr_type
= attr_type
1778 redef class AAttrExpr
1779 redef fun accept_typing
(v
)
1781 self.resolve_property
(v
)
1782 self.mtype
= self.attr_type
1787 redef class AAttrAssignExpr
1788 redef fun accept_typing
(v
)
1790 self.resolve_property
(v
)
1791 var mtype
= self.attr_type
1793 v
.visit_expr_subtype
(self.n_value
, mtype
)
1794 self.is_typed
= true
1798 redef class AAttrReassignExpr
1799 redef fun accept_typing
(v
)
1801 self.resolve_property
(v
)
1802 var mtype
= self.attr_type
1803 if mtype
== null then return # Skip error
1805 self.resolve_reassignment
(v
, mtype
, mtype
)
1807 self.is_typed
= true
1811 redef class AIssetAttrExpr
1812 redef fun accept_typing
(v
)
1814 self.resolve_property
(v
)
1815 var mtype
= self.attr_type
1816 if mtype
== null then return # Skip error
1818 var recvtype
= self.n_expr
.mtype
.as(not null)
1819 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1820 if bound
isa MNullableType then
1821 v
.error
(self, "Error: isset on a nullable attribute.")
1823 self.mtype
= v
.type_bool
(self)
1827 redef class AVarargExpr
1828 redef fun accept_typing
(v
)
1830 # This kind of pseudo-expression can be only processed trough a signature
1831 # See `check_signature`
1832 # Other cases are a syntax error.
1833 v
.error
(self, "Syntax error: unexpected `...`")
1839 redef class ADebugTypeExpr
1840 redef fun accept_typing
(v
)
1842 var expr
= v
.visit_expr
(self.n_expr
)
1843 if expr
== null then return
1844 var unsafe
= v
.anchor_to
(expr
)
1845 var ntype
= self.n_type
1846 var mtype
= v
.resolve_mtype
(ntype
)
1847 if mtype
!= null and mtype
!= expr
then
1848 var umtype
= v
.anchor_to
(mtype
)
1849 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1851 self.is_typed
= true