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 self.error
(node
, "Error: Method '{name}' call on 'null'.")
273 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
274 if name
== "new" and mproperty
== null then
276 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
279 if mproperty
== null then
280 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
282 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
284 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
289 assert mproperty
isa MMethod
291 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
292 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
294 if not recv_is_self
and mproperty
.is_toplevel
then
295 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
298 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
299 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
303 var info
= mproperty
.deprecation
304 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
307 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
309 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
313 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
315 if propdefs
.length
== 0 then
316 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
318 else if propdefs
.length
== 1 then
319 mpropdef
= propdefs
.first
321 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
322 mpropdef
= mproperty
.intro
326 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
327 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
329 var erasure_cast
= false
330 var rettype
= mpropdef
.msignature
.return_mtype
331 if not recv_is_self
and rettype
!= null then
332 rettype
= rettype
.as_notnullable
333 if rettype
isa MParameterType then
334 var erased_rettype
= msignature
.return_mtype
335 assert erased_rettype
!= null
336 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
341 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
345 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
347 var unsafe_type
= self.anchor_to
(recvtype
)
348 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
349 if mproperty
== null then return null
350 return get_method
(node
, recvtype
, name
, recv_is_self
)
354 # Visit the expressions of args and check their conformity with the corresponding type in signature
355 # The point of this method is to handle varargs correctly
356 # Note: The signature must be correctly adapted
357 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
359 var vararg_rank
= msignature
.vararg_rank
360 if vararg_rank
>= 0 then
361 if args
.length
< msignature
.arity
then
362 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
363 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
366 else if args
.length
!= msignature
.arity
then
367 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
371 #debug("CALL {unsafe_type}.{msignature}")
373 var vararg_decl
= args
.length
- msignature
.arity
374 for i
in [0..msignature
.arity
[ do
376 if i
== vararg_rank
then continue # skip the vararg
377 if i
> vararg_rank
then
380 var paramtype
= msignature
.mparameters
[i
].mtype
381 self.visit_expr_subtype
(args
[j
], paramtype
)
383 if vararg_rank
>= 0 then
384 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
385 var first
= args
[vararg_rank
]
386 if vararg_decl
== 0 and first
isa AVarargExpr then
387 var mclass
= get_mclass
(node
, "Array")
388 if mclass
== null then return false # Forward error
389 var array_mtype
= mclass
.get_mtype
([paramtype
])
390 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
391 first
.mtype
= first
.n_expr
.mtype
393 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
394 self.visit_expr_subtype
(args
[j
], paramtype
)
401 fun error
(node
: ANode, message
: String)
403 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
406 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
408 var flow
= node
.after_flow_context
410 self.error
(node
, "No context!")
414 if flow
.vars
.has_key
(variable
) then
415 return flow
.vars
[variable
]
417 #node.debug("*** START Collected for {variable}")
418 var mtypes
= flow
.collect_types
(variable
)
419 #node.debug("**** END Collected for {variable}")
420 if mtypes
== null or mtypes
.length
== 0 then
421 return variable
.declared_type
422 else if mtypes
.length
== 1 then
425 var res
= merge_types
(node
,mtypes
)
426 if res
== null then res
= variable
.declared_type
432 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
434 var flow
= node
.after_flow_context
437 flow
.set_var
(variable
, mtype
)
440 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
442 if col
.length
== 1 then return col
.first
444 if t1
== null then continue # return null
447 if t2
== null then continue # return null
448 if t2
isa MNullableType or t2
isa MNullType then
451 if not is_subtype
(t2
, t1
) then found
= false
454 #print "merge {col.join(" ")} -> {t1}"
458 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
463 # A specific method call site with its associated informations.
465 # The associated node for location
468 # The static type of the receiver (possibly unresolved)
471 # The module where the callsite is present
474 # The anchor to use with `recv` or `msignature`
475 var anchor
: nullable MClassType
477 # Is the receiver self?
478 # If "for_self", virtual types of the signature are kept
479 # If "not_for_self", virtual type are erased
480 var recv_is_self
: Bool
482 # The designated method
483 var mproperty
: MMethod
485 # The statically designated method definition
486 # The most specif one, it is.
487 var mpropdef
: MMethodDef
489 # The resolved signature for the receiver
490 var msignature
: MSignature
492 # Is a implicit cast required on erasure typing policy?
493 var erasure_cast
: Bool
495 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
497 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
502 # The declared type of the variable
503 var declared_type
: nullable MType
506 redef class FlowContext
507 # Store changes of types because of type evolution
508 private var vars
= new HashMap[Variable, nullable MType]
509 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
511 # Adapt the variable to a static type
512 # Warning1: do not modify vars directly.
513 # Warning2: sub-flow may have cached a unadapted variable
514 private fun set_var
(variable
: Variable, mtype
: nullable MType)
516 self.vars
[variable
] = mtype
517 self.cache
.keys
.remove
(variable
)
520 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
522 if cache
.has_key
(variable
) then
523 return cache
[variable
]
525 var res
: nullable Array[nullable MType] = null
526 if vars
.has_key
(variable
) then
527 var mtype
= vars
[variable
]
529 else if self.previous
.is_empty
then
531 res
= [variable
.declared_type
]
533 for flow
in self.previous
do
534 if flow
.is_unreachable
then continue
535 var r2
= flow
.collect_types
(variable
)
536 if r2
== null then continue
541 if not res
.has
(t
) then res
.add
(t
)
546 cache
[variable
] = res
552 # The entry point of the whole typing analysis
553 fun do_typing
(modelbuilder
: ModelBuilder)
557 # The variable associated to the receiver (if any)
558 var selfvariable
: nullable Variable
561 redef class AMethPropdef
562 redef fun do_typing
(modelbuilder
: ModelBuilder)
564 var nblock
= self.n_block
565 if nblock
== null then return
567 var mpropdef
= self.mpropdef
.as(not null)
568 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
569 self.selfvariable
= v
.selfvariable
571 var mmethoddef
= self.mpropdef
.as(not null)
572 for i
in [0..mmethoddef
.msignature
.arity
[ do
573 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
574 if mmethoddef
.msignature
.vararg_rank
== i
then
575 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
576 if arrayclass
== null then return # Skip error
577 mtype
= arrayclass
.get_mtype
([mtype
])
579 var variable
= self.n_signature
.n_params
[i
].variable
580 assert variable
!= null
581 variable
.declared_type
= mtype
585 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
586 # We reach the end of the function without having a return, it is bad
587 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
592 redef class AAttrPropdef
593 redef fun do_typing
(modelbuilder
: ModelBuilder)
595 var mpropdef
= self.mpropdef
.as(not null)
596 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
597 self.selfvariable
= v
.selfvariable
599 var nexpr
= self.n_expr
600 if nexpr
!= null then
601 var mtype
= self.mpropdef
.static_mtype
602 v
.visit_expr_subtype
(nexpr
, mtype
)
604 var nblock
= self.n_block
605 if nblock
!= null then
614 # The static type of the expression.
615 # null if self is a statement or in case of error
616 var mtype
: nullable MType = null
618 # Is the statement correctly typed?
619 # Used to distinguish errors and statements when `mtype == null`
620 var is_typed
: Bool = false
622 # If required, the following implicit cast `.as(XXX)`
623 # Such a cast may by required after evaluating the expression when
624 # a unsafe operation is detected (silently accepted by the Nit language).
625 # The attribute is computed by `check_subtype`
626 var implicit_cast_to
: nullable MType = null
628 # Return the variable read (if any)
629 # Used to perform adaptive typing
630 fun its_variable
: nullable Variable do return null
632 private fun accept_typing
(v
: TypeVisitor)
634 v
.error
(self, "no implemented accept_typing for {self.class_name}")
637 # Is non-null if `self` is a leaf of a comprehension array construction.
638 # In this case, the enclosing literal array node is designated.
639 # The result of the evaluation of `self` must be
640 # stored inside the designated array (there is an implicit `push`)
641 var comprehension
: nullable AArrayExpr = null
644 redef class ABlockExpr
645 redef fun accept_typing
(v
)
647 for e
in self.n_expr
do v
.visit_stmt
(e
)
651 # The type of a blockexpr is the one of the last expression (or null if empty)
654 if self.n_expr
.is_empty
then return null
655 return self.n_expr
.last
.mtype
659 redef class AVardeclExpr
660 redef fun accept_typing
(v
)
662 var variable
= self.variable
663 if variable
== null then return # Skip error
665 var ntype
= self.n_type
666 var mtype
: nullable MType
667 if ntype
== null then
670 mtype
= v
.resolve_mtype
(ntype
)
671 if mtype
== null then return # Skip error
674 var nexpr
= self.n_expr
675 if nexpr
!= null then
676 if mtype
!= null then
677 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
678 if etype
== mtype
then
680 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
683 mtype
= v
.visit_expr
(nexpr
)
684 if mtype
== null then return # Skip error
689 if mtype
== null or mtype
isa MNullType then
690 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
691 if mtype
== null then mtype
= decltype
694 variable
.declared_type
= decltype
695 v
.set_variable
(self, variable
, mtype
)
697 #debug("var {variable}: {mtype}")
704 redef fun its_variable
do return self.variable
705 redef fun accept_typing
(v
)
707 var variable
= self.variable
708 if variable
== null then return # Skip error
710 var mtype
= v
.get_variable
(self, variable
)
711 if mtype
!= null then
712 #debug("{variable} is {mtype}")
714 #debug("{variable} is untyped")
721 redef class AVarAssignExpr
722 redef fun accept_typing
(v
)
724 var variable
= self.variable
725 assert variable
!= null
727 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
729 v
.set_variable
(self, variable
, mtype
)
735 redef class AReassignFormExpr
736 # The method designed by the reassign operator.
737 var reassign_callsite
: nullable CallSite
739 var read_type
: nullable MType = null
741 # Determine the `reassign_property`
742 # `readtype` is the type of the reading of the left value.
743 # `writetype` is the type of the writing of the left value.
744 # (Because of `ACallReassignExpr`, both can be different.
745 # Return the static type of the value to store.
746 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
748 var reassign_name
: String
749 if self.n_assign_op
isa APlusAssignOp then
751 else if self.n_assign_op
isa AMinusAssignOp then
757 self.read_type
= readtype
759 if readtype
isa MNullType then
760 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
764 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
765 if callsite
== null then return null # Skip error
766 self.reassign_callsite
= callsite
768 var msignature
= callsite
.msignature
769 var rettype
= msignature
.return_mtype
770 assert msignature
.arity
== 1 and rettype
!= null
772 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
773 if value_type
== null then return null # Skip error
775 v
.check_subtype
(self, rettype
, writetype
)
780 redef class AVarReassignExpr
781 redef fun accept_typing
(v
)
783 var variable
= self.variable
784 assert variable
!= null
786 var readtype
= v
.get_variable
(self, variable
)
787 if readtype
== null then return
791 var writetype
= variable
.declared_type
792 if writetype
== null then return
794 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
796 v
.set_variable
(self, variable
, rettype
)
803 redef class AContinueExpr
804 redef fun accept_typing
(v
)
806 var nexpr
= self.n_expr
807 if nexpr
!= null then
814 redef class ABreakExpr
815 redef fun accept_typing
(v
)
817 var nexpr
= self.n_expr
818 if nexpr
!= null then
825 redef class AReturnExpr
826 redef fun accept_typing
(v
)
828 var nexpr
= self.n_expr
830 var mpropdef
= v
.mpropdef
831 if mpropdef
isa MMethodDef then
832 ret_type
= mpropdef
.msignature
.return_mtype
833 else if mpropdef
isa MAttributeDef then
834 ret_type
= mpropdef
.static_mtype
838 if nexpr
!= null then
839 if ret_type
!= null then
840 v
.visit_expr_subtype
(nexpr
, ret_type
)
843 v
.error
(self, "Error: Return with value in a procedure.")
845 else if ret_type
!= null then
846 v
.error
(self, "Error: Return without value in a function.")
852 redef class AAbortExpr
853 redef fun accept_typing
(v
)
860 redef fun accept_typing
(v
)
862 v
.visit_expr_bool
(n_expr
)
869 if n_then
!= null and n_else
== null then
870 self.mtype
= n_then
.mtype
875 redef class AIfexprExpr
876 redef fun accept_typing
(v
)
878 v
.visit_expr_bool
(n_expr
)
880 var t1
= v
.visit_expr
(n_then
)
881 var t2
= v
.visit_expr
(n_else
)
883 if t1
== null or t2
== null then
887 var t
= v
.merge_types
(self, [t1
, t2
])
889 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
896 redef fun accept_typing
(v
)
898 v
.visit_stmt
(n_block
)
903 redef class AWhileExpr
904 redef fun accept_typing
(v
)
906 v
.visit_expr_bool
(n_expr
)
908 v
.visit_stmt
(n_block
)
913 redef class ALoopExpr
914 redef fun accept_typing
(v
)
916 v
.visit_stmt
(n_block
)
922 var coltype
: nullable MClassType
924 var method_iterator
: nullable CallSite
925 var method_is_ok
: nullable CallSite
926 var method_item
: nullable CallSite
927 var method_next
: nullable CallSite
928 var method_key
: nullable CallSite
929 var method_finish
: nullable CallSite
931 var method_lt
: nullable CallSite
932 var method_successor
: nullable CallSite
934 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
936 if mtype
isa MNullType then
937 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
942 var objcla
= v
.get_mclass
(self, "Object")
943 if objcla
== null then return
945 # check iterator method
946 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
947 if itdef
== null then
948 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
951 self.method_iterator
= itdef
953 # check that iterator return something
954 var ittype
= itdef
.msignature
.return_mtype
955 if ittype
== null then
956 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
961 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
962 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
966 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
968 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
969 var variables
= self.variables
970 if variables
.length
!= 1 then
971 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
973 variables
.first
.declared_type
= coltype
.arguments
.first
978 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
980 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
981 var variables
= self.variables
982 if variables
.length
!= 2 then
983 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
985 variables
[0].declared_type
= coltype
.arguments
[0]
986 variables
[1].declared_type
= coltype
.arguments
[1]
991 if not is_col
and not is_map
then
992 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
996 # anchor formal and virtual types
997 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
999 mtype
= mtype
.as_notnullable
1000 self.coltype
= mtype
.as(MClassType)
1002 # get methods is_ok, next, item
1003 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1004 if ikdef
== null then
1005 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1008 self.method_is_ok
= ikdef
1010 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1011 if itemdef
== null then
1012 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1015 self.method_item
= itemdef
1017 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1018 if nextdef
== null then
1019 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1022 self.method_next
= nextdef
1024 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1027 var keydef
= v
.get_method
(self, ittype
, "key", false)
1028 if keydef
== null then
1029 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1032 self.method_key
= keydef
1035 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1036 var variable
= variables
.first
1037 var vtype
= variable
.declared_type
.as(not null)
1039 if n_expr
isa AOrangeExpr then
1040 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1042 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1045 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1049 redef fun accept_typing
(v
)
1051 var mtype
= v
.visit_expr
(n_expr
)
1052 if mtype
== null then return
1054 self.do_type_iterator
(v
, mtype
)
1056 v
.visit_stmt
(n_block
)
1057 self.mtype
= n_block
.mtype
1058 self.is_typed
= true
1062 redef class AAssertExpr
1063 redef fun accept_typing
(v
)
1065 v
.visit_expr_bool
(n_expr
)
1067 v
.visit_stmt
(n_else
)
1068 self.is_typed
= true
1073 redef fun accept_typing
(v
)
1075 v
.visit_expr_bool
(n_expr
)
1076 v
.visit_expr_bool
(n_expr2
)
1077 self.mtype
= v
.type_bool
(self)
1081 redef class AImpliesExpr
1082 redef fun accept_typing
(v
)
1084 v
.visit_expr_bool
(n_expr
)
1085 v
.visit_expr_bool
(n_expr2
)
1086 self.mtype
= v
.type_bool
(self)
1090 redef class AAndExpr
1091 redef fun accept_typing
(v
)
1093 v
.visit_expr_bool
(n_expr
)
1094 v
.visit_expr_bool
(n_expr2
)
1095 self.mtype
= v
.type_bool
(self)
1100 redef class ANotExpr
1101 redef fun accept_typing
(v
)
1103 v
.visit_expr_bool
(n_expr
)
1104 self.mtype
= v
.type_bool
(self)
1108 redef class AOrElseExpr
1109 redef fun accept_typing
(v
)
1111 var t1
= v
.visit_expr
(n_expr
)
1112 var t2
= v
.visit_expr
(n_expr2
)
1114 if t1
== null or t2
== null then
1118 t1
= t1
.as_notnullable
1120 var t
= v
.merge_types
(self, [t1
, t2
])
1122 t
= v
.mmodule
.object_type
1123 if t2
isa MNullableType then
1126 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1132 redef class ATrueExpr
1133 redef fun accept_typing
(v
)
1135 self.mtype
= v
.type_bool
(self)
1139 redef class AFalseExpr
1140 redef fun accept_typing
(v
)
1142 self.mtype
= v
.type_bool
(self)
1146 redef class AIntExpr
1147 redef fun accept_typing
(v
)
1149 var mclass
= v
.get_mclass
(self, "Int")
1150 if mclass
== null then return # Forward error
1151 self.mtype
= mclass
.mclass_type
1155 redef class AFloatExpr
1156 redef fun accept_typing
(v
)
1158 var mclass
= v
.get_mclass
(self, "Float")
1159 if mclass
== null then return # Forward error
1160 self.mtype
= mclass
.mclass_type
1164 redef class ACharExpr
1165 redef fun accept_typing
(v
)
1167 var mclass
= v
.get_mclass
(self, "Char")
1168 if mclass
== null then return # Forward error
1169 self.mtype
= mclass
.mclass_type
1173 redef class AStringFormExpr
1174 redef fun accept_typing
(v
)
1176 var mclass
= v
.get_mclass
(self, "String")
1177 if mclass
== null then return # Forward error
1178 self.mtype
= mclass
.mclass_type
1182 redef class ASuperstringExpr
1183 redef fun accept_typing
(v
)
1185 var mclass
= v
.get_mclass
(self, "String")
1186 if mclass
== null then return # Forward error
1187 self.mtype
= mclass
.mclass_type
1188 for nexpr
in self.n_exprs
do
1189 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1194 redef class AArrayExpr
1195 # The `with_capacity` method on Array
1196 var with_capacity_callsite
: nullable CallSite
1198 # The `push` method on arrays
1199 var push_callsite
: nullable CallSite
1201 # The element of each type
1202 var element_mtype
: nullable MType
1204 # Set that `self` is a part of comprehension array `na`
1205 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1206 private fun set_comprehension
(n
: nullable AExpr)
1210 else if n
isa AForExpr then
1211 set_comprehension
(n
.n_block
)
1212 else if n
isa AIfExpr then
1213 set_comprehension
(n
.n_then
)
1214 set_comprehension
(n
.n_else
)
1217 n
.comprehension
= self
1220 redef fun accept_typing
(v
)
1222 var mtype
: nullable MType = null
1223 var ntype
= self.n_type
1224 if ntype
!= null then
1225 mtype
= v
.resolve_mtype
(ntype
)
1226 if mtype
== null then return # Skip error
1228 var mtypes
= new Array[nullable MType]
1230 for e
in self.n_exprs
do
1231 var t
= v
.visit_expr
(e
)
1235 set_comprehension
(e
)
1236 if mtype
!= null then
1237 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1238 if t
== mtype
then useless
= true
1243 if mtype
== null then
1244 mtype
= v
.merge_types
(self, mtypes
)
1246 if mtype
== null or mtype
isa MNullType then
1247 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1251 assert ntype
!= null
1252 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1255 self.element_mtype
= mtype
1257 var mclass
= v
.get_mclass
(self, "Array")
1258 if mclass
== null then return # Forward error
1259 var array_mtype
= mclass
.get_mtype
([mtype
])
1261 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1262 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1264 self.mtype
= array_mtype
1268 redef class ARangeExpr
1269 var init_callsite
: nullable CallSite
1271 redef fun accept_typing
(v
)
1273 var discrete_class
= v
.get_mclass
(self, "Discrete")
1274 if discrete_class
== null then return # Forward error
1275 var discrete_type
= discrete_class
.intro
.bound_mtype
1276 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1277 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1278 if t1
== null or t2
== null then return
1279 var mclass
= v
.get_mclass
(self, "Range")
1280 if mclass
== null then return # Forward error
1282 if v
.is_subtype
(t1
, t2
) then
1283 mtype
= mclass
.get_mtype
([t2
])
1284 else if v
.is_subtype
(t2
, t1
) then
1285 mtype
= mclass
.get_mtype
([t1
])
1287 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1293 # get the constructor
1295 if self isa ACrangeExpr then
1296 callsite
= v
.get_method
(self, mtype
, "init", false)
1297 else if self isa AOrangeExpr then
1298 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1302 init_callsite
= callsite
1306 redef class ANullExpr
1307 redef fun accept_typing
(v
)
1309 self.mtype
= v
.mmodule
.model
.null_type
1313 redef class AIsaExpr
1314 # The static type to cast to.
1315 # (different from the static type of the expression that is `Bool`).
1316 var cast_type
: nullable MType
1317 redef fun accept_typing
(v
)
1319 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1320 self.cast_type
= mtype
1322 var variable
= self.n_expr
.its_variable
1323 if variable
!= null then
1324 #var orig = self.n_expr.mtype
1325 #var from = if orig != null then orig.to_s else "invalid"
1326 #var to = if mtype != null then mtype.to_s else "invalid"
1327 #debug("adapt {variable}: {from} -> {to}")
1328 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1331 self.mtype
= v
.type_bool
(self)
1335 redef class AAsCastExpr
1336 redef fun accept_typing
(v
)
1338 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1342 redef class AAsNotnullExpr
1343 redef fun accept_typing
(v
)
1345 var mtype
= v
.visit_expr
(self.n_expr
)
1346 if mtype
== null then return # Forward error
1348 if mtype
isa MNullType then
1349 v
.error
(self, "Type error: as(not null) on null")
1352 if mtype
isa MNullableType then
1353 self.mtype
= mtype
.mtype
1358 if mtype
isa MClassType then
1359 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1362 assert mtype
.need_anchor
1363 var u
= v
.anchor_to
(mtype
)
1364 if not u
isa MNullableType then
1365 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1371 redef class AParExpr
1372 redef fun accept_typing
(v
)
1374 self.mtype
= v
.visit_expr
(self.n_expr
)
1378 redef class AOnceExpr
1379 redef fun accept_typing
(v
)
1381 self.mtype
= v
.visit_expr
(self.n_expr
)
1385 redef class ASelfExpr
1386 redef var its_variable
: nullable Variable
1387 redef fun accept_typing
(v
)
1389 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1390 v
.error
(self, "Error: self cannot be used in top-level method.")
1392 var variable
= v
.selfvariable
1393 self.its_variable
= variable
1394 self.mtype
= v
.get_variable
(self, variable
)
1398 ## MESSAGE SENDING AND PROPERTY
1400 redef class ASendExpr
1401 # The property invoked by the send.
1402 var callsite
: nullable CallSite
1404 redef fun accept_typing
(v
)
1406 var recvtype
= v
.visit_expr
(self.n_expr
)
1407 var name
= self.property_name
1409 if recvtype
== null then return # Forward error
1410 if recvtype
isa MNullType then
1411 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1415 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1416 if callsite
== null then return
1417 self.callsite
= callsite
1418 var msignature
= callsite
.msignature
1420 var args
= compute_raw_arguments
1422 callsite
.check_signature
(v
, args
)
1424 if callsite
.mproperty
.is_init
then
1425 var vmpropdef
= v
.mpropdef
1426 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1427 v
.error
(self, "Can call a init only in another init")
1429 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1430 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1434 var ret
= msignature
.return_mtype
1438 self.is_typed
= true
1442 # The name of the property
1443 # Each subclass simply provide the correct name.
1444 private fun property_name
: String is abstract
1446 # An array of all arguments (excluding self)
1447 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1449 private fun compute_raw_arguments
: Array[AExpr] is abstract
1452 redef class ABinopExpr
1453 redef fun compute_raw_arguments
do return [n_expr2
]
1456 redef fun property_name
do return "=="
1457 redef fun accept_typing
(v
)
1464 redef fun property_name
do return "!="
1465 redef fun accept_typing
(v
)
1472 redef fun property_name
do return "<"
1475 redef fun property_name
do return "<="
1478 redef fun property_name
do return "<<"
1481 redef fun property_name
do return ">"
1484 redef fun property_name
do return ">="
1487 redef fun property_name
do return ">>"
1489 redef class APlusExpr
1490 redef fun property_name
do return "+"
1492 redef class AMinusExpr
1493 redef fun property_name
do return "-"
1495 redef class AStarshipExpr
1496 redef fun property_name
do return "<=>"
1498 redef class AStarExpr
1499 redef fun property_name
do return "*"
1501 redef class AStarstarExpr
1502 redef fun property_name
do return "**"
1504 redef class ASlashExpr
1505 redef fun property_name
do return "/"
1507 redef class APercentExpr
1508 redef fun property_name
do return "%"
1511 redef class AUminusExpr
1512 redef fun property_name
do return "unary -"
1513 redef fun compute_raw_arguments
do return new Array[AExpr]
1517 redef class ACallExpr
1518 redef fun property_name
do return n_id
.text
1519 redef fun compute_raw_arguments
do return n_args
.to_a
1522 redef class ACallAssignExpr
1523 redef fun property_name
do return n_id
.text
+ "="
1524 redef fun compute_raw_arguments
1526 var res
= n_args
.to_a
1532 redef class ABraExpr
1533 redef fun property_name
do return "[]"
1534 redef fun compute_raw_arguments
do return n_args
.to_a
1537 redef class ABraAssignExpr
1538 redef fun property_name
do return "[]="
1539 redef fun compute_raw_arguments
1541 var res
= n_args
.to_a
1547 redef class ASendReassignFormExpr
1548 # The property invoked for the writing
1549 var write_callsite
: nullable CallSite
1551 redef fun accept_typing
(v
)
1553 var recvtype
= v
.visit_expr
(self.n_expr
)
1554 var name
= self.property_name
1556 if recvtype
== null then return # Forward error
1557 if recvtype
isa MNullType then
1558 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1562 var for_self
= self.n_expr
isa ASelfExpr
1563 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1565 if callsite
== null then return
1566 self.callsite
= callsite
1568 var args
= compute_raw_arguments
1570 callsite
.check_signature
(v
, args
)
1572 var readtype
= callsite
.msignature
.return_mtype
1573 if readtype
== null then
1574 v
.error
(self, "Error: {name} is not a function")
1578 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1579 if wcallsite
== null then return
1580 self.write_callsite
= wcallsite
1582 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1583 if wtype
== null then return
1585 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1586 args
.add
(self.n_value
)
1587 wcallsite
.check_signature
(v
, args
)
1589 self.is_typed
= true
1593 redef class ACallReassignExpr
1594 redef fun property_name
do return n_id
.text
1595 redef fun compute_raw_arguments
do return n_args
.to_a
1598 redef class ABraReassignExpr
1599 redef fun property_name
do return "[]"
1600 redef fun compute_raw_arguments
do return n_args
.to_a
1603 redef class AInitExpr
1604 redef fun property_name
do return "init"
1605 redef fun compute_raw_arguments
do return n_args
.to_a
1609 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1614 redef class ASuperExpr
1615 # The method to call if the super is in fact a 'super init call'
1616 # Note: if the super is a normal call-next-method, then this attribute is null
1617 var callsite
: nullable CallSite
1619 # The method to call is the super is a standard `call-next-method` super-call
1620 # Note: if the super is a special super-init-call, then this attribute is null
1621 var mpropdef
: nullable MMethodDef
1623 redef fun accept_typing
(v
)
1625 var anchor
= v
.anchor
1626 assert anchor
!= null
1627 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1628 assert recvtype
!= null
1629 var mproperty
= v
.mpropdef
.mproperty
1630 if not mproperty
isa MMethod then
1631 v
.error
(self, "Error: super only usable in a method")
1634 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1635 if superprops
.length
== 0 then
1636 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1637 process_superinit
(v
)
1640 v
.error
(self, "Error: No super method to call for {mproperty}.")
1643 # FIXME: covariance of return type in linear extension?
1644 var superprop
= superprops
.first
1646 var msignature
= superprop
.msignature
.as(not null)
1647 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1648 var args
= self.n_args
.to_a
1649 if args
.length
> 0 then
1650 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1652 self.mtype
= msignature
.return_mtype
1653 self.is_typed
= true
1654 v
.mpropdef
.has_supercall
= true
1655 mpropdef
= v
.mpropdef
.as(MMethodDef)
1658 private fun process_superinit
(v
: TypeVisitor)
1660 var anchor
= v
.anchor
1661 assert anchor
!= null
1662 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1663 assert recvtype
!= null
1664 var mpropdef
= v
.mpropdef
1665 assert mpropdef
isa MMethodDef
1666 var mproperty
= mpropdef
.mproperty
1667 var superprop
: nullable MMethodDef = null
1668 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1669 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1670 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1671 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1672 if candidate
== null then
1673 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1674 continue # Try next super-class
1676 if superprop
!= null and candidate
.is_root_init
then
1679 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1680 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1683 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1684 if superprop
!= null and superprop
.mproperty
== candidate
then
1685 if superprop
== candidatedefs
.first
then continue
1686 candidatedefs
.add
(superprop
)
1688 if candidatedefs
.length
> 1 then
1689 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1692 superprop
= candidatedefs
.first
1694 if superprop
== null then
1695 v
.error
(self, "Error: No super method to call for {mproperty}.")
1699 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1700 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1702 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1703 self.callsite
= callsite
1705 var args
= self.n_args
.to_a
1706 if args
.length
> 0 then
1707 callsite
.check_signature
(v
, args
)
1709 # Check there is at least enough parameters
1710 if mpropdef
.msignature
.arity
< msignature
.arity
then
1711 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1714 # Check that each needed parameter is conform
1716 for sp
in msignature
.mparameters
do
1717 var p
= mpropdef
.msignature
.mparameters
[i
]
1718 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1719 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1726 self.is_typed
= true
1732 redef class ANewExpr
1733 # The constructor invoked by the new.
1734 var callsite
: nullable CallSite
1736 # The designated type
1737 var recvtype
: nullable MClassType
1739 redef fun accept_typing
(v
)
1741 var recvtype
= v
.resolve_mtype
(self.n_type
)
1742 if recvtype
== null then return
1744 if not recvtype
isa MClassType then
1745 if recvtype
isa MNullableType then
1746 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1749 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1754 self.recvtype
= recvtype
1763 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1764 if callsite
== null then return
1766 if not callsite
.mproperty
.is_new
then
1767 var kind
= recvtype
.mclass
.kind
1768 if kind
!= concrete_kind
then
1769 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1772 self.mtype
= recvtype
1774 self.mtype
= callsite
.msignature
.return_mtype
1775 assert self.mtype
!= null
1778 self.callsite
= callsite
1780 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1781 v
.error
(self, "Error: {name} is not a constructor.")
1785 var args
= n_args
.to_a
1786 callsite
.check_signature
(v
, args
)
1792 redef class AAttrFormExpr
1793 # The attribute acceded.
1794 var mproperty
: nullable MAttribute
1796 # The static type of the attribute.
1797 var attr_type
: nullable MType
1799 # Resolve the attribute acceded.
1800 private fun resolve_property
(v
: TypeVisitor)
1802 var recvtype
= v
.visit_expr
(self.n_expr
)
1803 if recvtype
== null then return # Skip error
1804 var name
= self.n_id
.text
1805 if recvtype
isa MNullType then
1806 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1810 var unsafe_type
= v
.anchor_to
(recvtype
)
1811 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1812 if mproperty
== null then
1813 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1816 assert mproperty
isa MAttribute
1817 self.mproperty
= mproperty
1819 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1820 assert mpropdefs
.length
== 1
1821 var mpropdef
= mpropdefs
.first
1822 var attr_type
= mpropdef
.static_mtype
.as(not null)
1823 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1824 self.attr_type
= attr_type
1828 redef class AAttrExpr
1829 redef fun accept_typing
(v
)
1831 self.resolve_property
(v
)
1832 self.mtype
= self.attr_type
1837 redef class AAttrAssignExpr
1838 redef fun accept_typing
(v
)
1840 self.resolve_property
(v
)
1841 var mtype
= self.attr_type
1843 v
.visit_expr_subtype
(self.n_value
, mtype
)
1844 self.is_typed
= true
1848 redef class AAttrReassignExpr
1849 redef fun accept_typing
(v
)
1851 self.resolve_property
(v
)
1852 var mtype
= self.attr_type
1853 if mtype
== null then return # Skip error
1855 self.resolve_reassignment
(v
, mtype
, mtype
)
1857 self.is_typed
= true
1861 redef class AIssetAttrExpr
1862 redef fun accept_typing
(v
)
1864 self.resolve_property
(v
)
1865 var mtype
= self.attr_type
1866 if mtype
== null then return # Skip error
1868 var recvtype
= self.n_expr
.mtype
.as(not null)
1869 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1870 if bound
isa MNullableType then
1871 v
.error
(self, "Error: isset on a nullable attribute.")
1873 self.mtype
= v
.type_bool
(self)
1877 redef class AVarargExpr
1878 redef fun accept_typing
(v
)
1880 # This kind of pseudo-expression can be only processed trough a signature
1881 # See `check_signature`
1882 # Other cases are a syntax error.
1883 v
.error
(self, "Syntax error: unexpected `...`")
1889 redef class ADebugTypeExpr
1890 redef fun accept_typing
(v
)
1892 var expr
= v
.visit_expr
(self.n_expr
)
1893 if expr
== null then return
1894 var unsafe
= v
.anchor_to
(expr
)
1895 var ntype
= self.n_type
1896 var mtype
= v
.resolve_mtype
(ntype
)
1897 if mtype
!= null and mtype
!= expr
then
1898 var umtype
= v
.anchor_to
(mtype
)
1899 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1901 self.is_typed
= true