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
or mprop
.is_new
) then
76 is_toplevel_context
= true
81 fun anchor_to
(mtype
: MType): MType
84 if anchor
== null then
85 assert not mtype
.need_anchor
88 return mtype
.anchor_to
(mmodule
, anchor
)
91 fun is_subtype
(sub
, sup
: MType): Bool
93 return sub
.is_subtype
(mmodule
, anchor
, sup
)
96 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
98 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
99 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
103 # Check that `sub` is a subtype of `sup`.
104 # If `sub` is not a valid suptype, then display an error on `node` an return null.
105 # If `sub` is a safe subtype of `sup` then return `sub`.
106 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
108 # The point of the return type is to determinate the usable type on an expression:
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
)
605 var nblock
= self.n_block
606 if nblock
!= null then
615 # The static type of the expression.
616 # null if self is a statement or in case of error
617 var mtype
: nullable MType = null
619 # Is the statement correctly typed?
620 # Used to distinguish errors and statements when `mtype == null`
621 var is_typed
: Bool = false
623 # If required, the following implicit cast `.as(XXX)`
624 # Such a cast may by required after evaluating the expression when
625 # a unsafe operation is detected (silently accepted by the Nit language).
626 # The attribute is computed by `check_subtype`
627 var implicit_cast_to
: nullable MType = null
629 # Return the variable read (if any)
630 # Used to perform adaptive typing
631 fun its_variable
: nullable Variable do return null
633 private fun accept_typing
(v
: TypeVisitor)
635 v
.error
(self, "no implemented accept_typing for {self.class_name}")
639 redef class ABlockExpr
640 redef fun accept_typing
(v
)
642 for e
in self.n_expr
do v
.visit_stmt
(e
)
646 # The type of a blockexpr is the one of the last expression (or null if empty)
649 if self.n_expr
.is_empty
then return null
650 return self.n_expr
.last
.mtype
654 redef class AVardeclExpr
655 redef fun accept_typing
(v
)
657 var variable
= self.variable
658 if variable
== null then return # Skip error
660 var ntype
= self.n_type
661 var mtype
: nullable MType
662 if ntype
== null then
665 mtype
= v
.resolve_mtype
(ntype
)
666 if mtype
== null then return # Skip error
669 var nexpr
= self.n_expr
670 if nexpr
!= null then
671 if mtype
!= null then
672 v
.visit_expr_subtype
(nexpr
, mtype
)
674 mtype
= v
.visit_expr
(nexpr
)
675 if mtype
== null then return # Skip error
680 if mtype
== null or mtype
isa MNullType then
681 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
682 if mtype
== null then mtype
= decltype
685 variable
.declared_type
= decltype
686 v
.set_variable
(self, variable
, mtype
)
688 #debug("var {variable}: {mtype}")
695 redef fun its_variable
do return self.variable
696 redef fun accept_typing
(v
)
698 var variable
= self.variable
699 if variable
== null then return # Skip error
701 var mtype
= v
.get_variable
(self, variable
)
702 if mtype
!= null then
703 #debug("{variable} is {mtype}")
705 #debug("{variable} is untyped")
712 redef class AVarAssignExpr
713 redef fun accept_typing
(v
)
715 var variable
= self.variable
716 assert variable
!= null
718 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
720 v
.set_variable
(self, variable
, mtype
)
726 redef class AReassignFormExpr
727 # The method designed by the reassign operator.
728 var reassign_callsite
: nullable CallSite
730 var read_type
: nullable MType = null
732 # Determine the `reassign_property`
733 # `readtype` is the type of the reading of the left value.
734 # `writetype` is the type of the writing of the left value.
735 # (Because of `ACallReassignExpr`, both can be different.
736 # Return the static type of the value to store.
737 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
739 var reassign_name
: String
740 if self.n_assign_op
isa APlusAssignOp then
742 else if self.n_assign_op
isa AMinusAssignOp then
748 self.read_type
= readtype
750 if readtype
isa MNullType then
751 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
755 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
756 if callsite
== null then return null # Skip error
757 self.reassign_callsite
= callsite
759 var msignature
= callsite
.msignature
760 var rettype
= msignature
.return_mtype
761 assert msignature
.arity
== 1 and rettype
!= null
763 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
764 if value_type
== null then return null # Skip error
766 v
.check_subtype
(self, rettype
, writetype
)
771 redef class AVarReassignExpr
772 redef fun accept_typing
(v
)
774 var variable
= self.variable
775 assert variable
!= null
777 var readtype
= v
.get_variable
(self, variable
)
778 if readtype
== null then return
782 var writetype
= variable
.declared_type
783 if writetype
== null then return
785 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
787 v
.set_variable
(self, variable
, rettype
)
794 redef class AContinueExpr
795 redef fun accept_typing
(v
)
797 var nexpr
= self.n_expr
798 if nexpr
!= null then
805 redef class ABreakExpr
806 redef fun accept_typing
(v
)
808 var nexpr
= self.n_expr
809 if nexpr
!= null then
816 redef class AReturnExpr
817 redef fun accept_typing
(v
)
819 var nexpr
= self.n_expr
821 var mpropdef
= v
.mpropdef
822 if mpropdef
isa MMethodDef then
823 ret_type
= mpropdef
.msignature
.return_mtype
824 else if mpropdef
isa MAttributeDef then
825 ret_type
= mpropdef
.static_mtype
829 if nexpr
!= null then
830 if ret_type
!= null then
831 v
.visit_expr_subtype
(nexpr
, ret_type
)
834 v
.error
(self, "Error: Return with value in a procedure.")
836 else if ret_type
!= null then
837 v
.error
(self, "Error: Return without value in a function.")
843 redef class AAbortExpr
844 redef fun accept_typing
(v
)
851 redef fun accept_typing
(v
)
853 v
.visit_expr_bool
(n_expr
)
861 redef class AIfexprExpr
862 redef fun accept_typing
(v
)
864 v
.visit_expr_bool
(n_expr
)
866 var t1
= v
.visit_expr
(n_then
)
867 var t2
= v
.visit_expr
(n_else
)
869 if t1
== null or t2
== null then
873 var t
= v
.merge_types
(self, [t1
, t2
])
875 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
882 redef fun accept_typing
(v
)
884 v
.visit_stmt
(n_block
)
889 redef class AWhileExpr
890 redef fun accept_typing
(v
)
892 v
.visit_expr_bool
(n_expr
)
894 v
.visit_stmt
(n_block
)
899 redef class ALoopExpr
900 redef fun accept_typing
(v
)
902 v
.visit_stmt
(n_block
)
908 var coltype
: nullable MClassType
910 var method_iterator
: nullable CallSite
911 var method_is_ok
: nullable CallSite
912 var method_item
: nullable CallSite
913 var method_next
: nullable CallSite
914 var method_key
: nullable CallSite
915 var method_finish
: nullable CallSite
917 var method_lt
: nullable CallSite
918 var method_successor
: nullable CallSite
920 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
922 if mtype
isa MNullType then
923 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
928 var objcla
= v
.get_mclass
(self, "Object")
929 if objcla
== null then return
931 # check iterator method
932 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
933 if itdef
== null then
934 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
937 self.method_iterator
= itdef
939 # check that iterator return something
940 var ittype
= itdef
.msignature
.return_mtype
941 if ittype
== null then
942 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
947 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
948 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
952 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
954 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
955 var variables
= self.variables
956 if variables
.length
!= 1 then
957 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
959 variables
.first
.declared_type
= coltype
.arguments
.first
964 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
966 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
967 var variables
= self.variables
968 if variables
.length
!= 2 then
969 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
971 variables
[0].declared_type
= coltype
.arguments
[0]
972 variables
[1].declared_type
= coltype
.arguments
[1]
977 if not is_col
and not is_map
then
978 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
982 # anchor formal and virtual types
983 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
985 mtype
= mtype
.as_notnullable
986 self.coltype
= mtype
.as(MClassType)
988 # get methods is_ok, next, item
989 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
990 if ikdef
== null then
991 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
994 self.method_is_ok
= ikdef
996 var itemdef
= v
.get_method
(self, ittype
, "item", false)
997 if itemdef
== null then
998 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1001 self.method_item
= itemdef
1003 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1004 if nextdef
== null then
1005 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1008 self.method_next
= nextdef
1010 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1013 var keydef
= v
.get_method
(self, ittype
, "key", false)
1014 if keydef
== null then
1015 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1018 self.method_key
= keydef
1021 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1022 var variable
= variables
.first
1023 var vtype
= variable
.declared_type
.as(not null)
1025 if n_expr
isa AOrangeExpr then
1026 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1028 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1031 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1035 redef fun accept_typing
(v
)
1037 var mtype
= v
.visit_expr
(n_expr
)
1038 if mtype
== null then return
1040 self.do_type_iterator
(v
, mtype
)
1042 v
.visit_stmt
(n_block
)
1043 self.is_typed
= true
1047 redef class AAssertExpr
1048 redef fun accept_typing
(v
)
1050 v
.visit_expr_bool
(n_expr
)
1052 v
.visit_stmt
(n_else
)
1053 self.is_typed
= true
1058 redef fun accept_typing
(v
)
1060 v
.visit_expr_bool
(n_expr
)
1061 v
.visit_expr_bool
(n_expr2
)
1062 self.mtype
= v
.type_bool
(self)
1066 redef class AImpliesExpr
1067 redef fun accept_typing
(v
)
1069 v
.visit_expr_bool
(n_expr
)
1070 v
.visit_expr_bool
(n_expr2
)
1071 self.mtype
= v
.type_bool
(self)
1075 redef class AAndExpr
1076 redef fun accept_typing
(v
)
1078 v
.visit_expr_bool
(n_expr
)
1079 v
.visit_expr_bool
(n_expr2
)
1080 self.mtype
= v
.type_bool
(self)
1085 redef class ANotExpr
1086 redef fun accept_typing
(v
)
1088 v
.visit_expr_bool
(n_expr
)
1089 self.mtype
= v
.type_bool
(self)
1093 redef class AOrElseExpr
1094 redef fun accept_typing
(v
)
1096 var t1
= v
.visit_expr
(n_expr
)
1097 var t2
= v
.visit_expr
(n_expr2
)
1099 if t1
== null or t2
== null then
1103 t1
= t1
.as_notnullable
1105 var t
= v
.merge_types
(self, [t1
, t2
])
1107 t
= v
.mmodule
.object_type
1108 if t2
isa MNullableType then
1111 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1117 redef class ATrueExpr
1118 redef fun accept_typing
(v
)
1120 self.mtype
= v
.type_bool
(self)
1124 redef class AFalseExpr
1125 redef fun accept_typing
(v
)
1127 self.mtype
= v
.type_bool
(self)
1131 redef class AIntExpr
1132 redef fun accept_typing
(v
)
1134 var mclass
= v
.get_mclass
(self, "Int")
1135 if mclass
== null then return # Forward error
1136 self.mtype
= mclass
.mclass_type
1140 redef class AFloatExpr
1141 redef fun accept_typing
(v
)
1143 var mclass
= v
.get_mclass
(self, "Float")
1144 if mclass
== null then return # Forward error
1145 self.mtype
= mclass
.mclass_type
1149 redef class ACharExpr
1150 redef fun accept_typing
(v
)
1152 var mclass
= v
.get_mclass
(self, "Char")
1153 if mclass
== null then return # Forward error
1154 self.mtype
= mclass
.mclass_type
1158 redef class AStringFormExpr
1159 redef fun accept_typing
(v
)
1161 var mclass
= v
.get_mclass
(self, "String")
1162 if mclass
== null then return # Forward error
1163 self.mtype
= mclass
.mclass_type
1167 redef class ASuperstringExpr
1168 redef fun accept_typing
(v
)
1170 var mclass
= v
.get_mclass
(self, "String")
1171 if mclass
== null then return # Forward error
1172 self.mtype
= mclass
.mclass_type
1173 for nexpr
in self.n_exprs
do
1174 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1179 redef class AArrayExpr
1180 var with_capacity_callsite
: nullable CallSite
1181 var push_callsite
: nullable CallSite
1183 redef fun accept_typing
(v
)
1185 var mtype
: nullable MType = null
1186 var ntype
= self.n_type
1187 if ntype
!= null then
1188 mtype
= v
.resolve_mtype
(ntype
)
1189 if mtype
== null then return # Skip error
1191 var mtypes
= new Array[nullable MType]
1193 for e
in self.n_exprs
.n_exprs
do
1194 var t
= v
.visit_expr
(e
)
1198 if mtype
!= null then
1199 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1200 if t
== mtype
then useless
= true
1205 if mtype
== null then
1206 mtype
= v
.merge_types
(self, mtypes
)
1208 if mtype
== null then
1209 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1213 assert ntype
!= null
1214 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1216 var mclass
= v
.get_mclass
(self, "Array")
1217 if mclass
== null then return # Forward error
1218 var array_mtype
= mclass
.get_mtype
([mtype
])
1220 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1221 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1223 self.mtype
= array_mtype
1227 redef class ARangeExpr
1228 var init_callsite
: nullable CallSite
1230 redef fun accept_typing
(v
)
1232 var discrete_class
= v
.get_mclass
(self, "Discrete")
1233 if discrete_class
== null then return # Forward error
1234 var discrete_type
= discrete_class
.intro
.bound_mtype
1235 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1236 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1237 if t1
== null or t2
== null then return
1238 var mclass
= v
.get_mclass
(self, "Range")
1239 if mclass
== null then return # Forward error
1241 if v
.is_subtype
(t1
, t2
) then
1242 mtype
= mclass
.get_mtype
([t2
])
1243 else if v
.is_subtype
(t2
, t1
) then
1244 mtype
= mclass
.get_mtype
([t1
])
1246 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1252 # get the constructor
1254 if self isa ACrangeExpr then
1255 callsite
= v
.get_method
(self, mtype
, "init", false)
1256 else if self isa AOrangeExpr then
1257 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1261 init_callsite
= callsite
1265 redef class ANullExpr
1266 redef fun accept_typing
(v
)
1268 self.mtype
= v
.mmodule
.model
.null_type
1272 redef class AIsaExpr
1273 # The static type to cast to.
1274 # (different from the static type of the expression that is `Bool`).
1275 var cast_type
: nullable MType
1276 redef fun accept_typing
(v
)
1278 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1279 self.cast_type
= mtype
1281 var variable
= self.n_expr
.its_variable
1282 if variable
!= null then
1283 #var orig = self.n_expr.mtype
1284 #var from = if orig != null then orig.to_s else "invalid"
1285 #var to = if mtype != null then mtype.to_s else "invalid"
1286 #debug("adapt {variable}: {from} -> {to}")
1287 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1290 self.mtype
= v
.type_bool
(self)
1294 redef class AAsCastExpr
1295 redef fun accept_typing
(v
)
1297 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1301 redef class AAsNotnullExpr
1302 redef fun accept_typing
(v
)
1304 var mtype
= v
.visit_expr
(self.n_expr
)
1305 if mtype
== null then return # Forward error
1307 if mtype
isa MNullType then
1308 v
.error
(self, "Type error: as(not null) on null")
1311 if mtype
isa MNullableType then
1312 self.mtype
= mtype
.mtype
1317 if mtype
isa MClassType then
1318 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1321 assert mtype
.need_anchor
1322 var u
= v
.anchor_to
(mtype
)
1323 if not u
isa MNullableType then
1324 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1330 redef class AParExpr
1331 redef fun accept_typing
(v
)
1333 self.mtype
= v
.visit_expr
(self.n_expr
)
1337 redef class AOnceExpr
1338 redef fun accept_typing
(v
)
1340 self.mtype
= v
.visit_expr
(self.n_expr
)
1344 redef class ASelfExpr
1345 redef var its_variable
: nullable Variable
1346 redef fun accept_typing
(v
)
1348 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1349 v
.error
(self, "Error: self cannot be used in top-level method.")
1351 var variable
= v
.selfvariable
1352 self.its_variable
= variable
1353 self.mtype
= v
.get_variable
(self, variable
)
1357 ## MESSAGE SENDING AND PROPERTY
1359 redef class ASendExpr
1360 # The property invoked by the send.
1361 var callsite
: nullable CallSite
1363 redef fun accept_typing
(v
)
1365 var recvtype
= v
.visit_expr
(self.n_expr
)
1366 var name
= self.property_name
1368 if recvtype
== null then return # Forward error
1369 if recvtype
isa MNullType then
1370 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1374 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1375 if callsite
== null then return
1376 self.callsite
= callsite
1377 var msignature
= callsite
.msignature
1379 var args
= compute_raw_arguments
1381 callsite
.check_signature
(v
, args
)
1383 if callsite
.mproperty
.is_init
then
1384 var vmpropdef
= v
.mpropdef
1385 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1386 v
.error
(self, "Can call a init only in another init")
1388 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1389 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1393 var ret
= msignature
.return_mtype
1397 self.is_typed
= true
1401 # The name of the property
1402 # Each subclass simply provide the correct name.
1403 private fun property_name
: String is abstract
1405 # An array of all arguments (excluding self)
1406 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1408 private fun compute_raw_arguments
: Array[AExpr] is abstract
1411 redef class ABinopExpr
1412 redef fun compute_raw_arguments
do return [n_expr2
]
1415 redef fun property_name
do return "=="
1416 redef fun accept_typing
(v
)
1423 redef fun property_name
do return "!="
1424 redef fun accept_typing
(v
)
1431 redef fun property_name
do return "<"
1434 redef fun property_name
do return "<="
1437 redef fun property_name
do return "<<"
1440 redef fun property_name
do return ">"
1443 redef fun property_name
do return ">="
1446 redef fun property_name
do return ">>"
1448 redef class APlusExpr
1449 redef fun property_name
do return "+"
1451 redef class AMinusExpr
1452 redef fun property_name
do return "-"
1454 redef class AStarshipExpr
1455 redef fun property_name
do return "<=>"
1457 redef class AStarExpr
1458 redef fun property_name
do return "*"
1460 redef class AStarstarExpr
1461 redef fun property_name
do return "**"
1463 redef class ASlashExpr
1464 redef fun property_name
do return "/"
1466 redef class APercentExpr
1467 redef fun property_name
do return "%"
1470 redef class AUminusExpr
1471 redef fun property_name
do return "unary -"
1472 redef fun compute_raw_arguments
do return new Array[AExpr]
1476 redef class ACallExpr
1477 redef fun property_name
do return n_id
.text
1478 redef fun compute_raw_arguments
do return n_args
.to_a
1481 redef class ACallAssignExpr
1482 redef fun property_name
do return n_id
.text
+ "="
1483 redef fun compute_raw_arguments
1485 var res
= n_args
.to_a
1491 redef class ABraExpr
1492 redef fun property_name
do return "[]"
1493 redef fun compute_raw_arguments
do return n_args
.to_a
1496 redef class ABraAssignExpr
1497 redef fun property_name
do return "[]="
1498 redef fun compute_raw_arguments
1500 var res
= n_args
.to_a
1506 redef class ASendReassignFormExpr
1507 # The property invoked for the writing
1508 var write_callsite
: nullable CallSite
1510 redef fun accept_typing
(v
)
1512 var recvtype
= v
.visit_expr
(self.n_expr
)
1513 var name
= self.property_name
1515 if recvtype
== null then return # Forward error
1516 if recvtype
isa MNullType then
1517 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1521 var for_self
= self.n_expr
isa ASelfExpr
1522 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1524 if callsite
== null then return
1525 self.callsite
= callsite
1527 var args
= compute_raw_arguments
1529 callsite
.check_signature
(v
, args
)
1531 var readtype
= callsite
.msignature
.return_mtype
1532 if readtype
== null then
1533 v
.error
(self, "Error: {name} is not a function")
1537 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1538 if wcallsite
== null then return
1539 self.write_callsite
= wcallsite
1541 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1542 if wtype
== null then return
1544 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1545 args
.add
(self.n_value
)
1546 wcallsite
.check_signature
(v
, args
)
1548 self.is_typed
= true
1552 redef class ACallReassignExpr
1553 redef fun property_name
do return n_id
.text
1554 redef fun compute_raw_arguments
do return n_args
.to_a
1557 redef class ABraReassignExpr
1558 redef fun property_name
do return "[]"
1559 redef fun compute_raw_arguments
do return n_args
.to_a
1562 redef class AInitExpr
1563 redef fun property_name
do return "init"
1564 redef fun compute_raw_arguments
do return n_args
.to_a
1568 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1573 redef class ASuperExpr
1574 # The method to call if the super is in fact a 'super init call'
1575 # Note: if the super is a normal call-next-method, then this attribute is null
1576 var callsite
: nullable CallSite
1578 # The method to call is the super is a standard `call-next-method` super-call
1579 # Note: if the super is a special super-init-call, then this attribute is null
1580 var mpropdef
: nullable MMethodDef
1582 redef fun accept_typing
(v
)
1584 var anchor
= v
.anchor
1585 assert anchor
!= null
1586 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1587 assert recvtype
!= null
1588 var mproperty
= v
.mpropdef
.mproperty
1589 if not mproperty
isa MMethod then
1590 v
.error
(self, "Error: super only usable in a method")
1593 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1594 if superprops
.length
== 0 then
1595 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1596 process_superinit
(v
)
1599 v
.error
(self, "Error: No super method to call for {mproperty}.")
1602 # FIXME: covariance of return type in linear extension?
1603 var superprop
= superprops
.first
1605 var msignature
= superprop
.msignature
.as(not null)
1606 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1607 var args
= self.n_args
.to_a
1608 if args
.length
> 0 then
1609 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1611 self.mtype
= msignature
.return_mtype
1612 self.is_typed
= true
1613 v
.mpropdef
.has_supercall
= true
1614 mpropdef
= v
.mpropdef
.as(MMethodDef)
1617 private fun process_superinit
(v
: TypeVisitor)
1619 var anchor
= v
.anchor
1620 assert anchor
!= null
1621 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1622 assert recvtype
!= null
1623 var mpropdef
= v
.mpropdef
1624 assert mpropdef
isa MMethodDef
1625 var mproperty
= mpropdef
.mproperty
1626 var superprop
: nullable MMethodDef = null
1627 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1628 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1629 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1630 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1631 if candidate
== null then
1632 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1633 continue # Try next super-class
1635 if superprop
!= null and candidate
.is_root_init
then
1638 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1639 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1642 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1643 if superprop
!= null and superprop
.mproperty
== candidate
then
1644 if superprop
== candidatedefs
.first
then continue
1645 candidatedefs
.add
(superprop
)
1647 if candidatedefs
.length
> 1 then
1648 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1651 superprop
= candidatedefs
.first
1653 if superprop
== null then
1654 v
.error
(self, "Error: No super method to call for {mproperty}.")
1658 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1659 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1661 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1662 self.callsite
= callsite
1664 var args
= self.n_args
.to_a
1665 if args
.length
> 0 then
1666 callsite
.check_signature
(v
, args
)
1668 # Check there is at least enough parameters
1669 if mpropdef
.msignature
.arity
< msignature
.arity
then
1670 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1673 # Check that each needed parameter is conform
1675 for sp
in msignature
.mparameters
do
1676 var p
= mpropdef
.msignature
.mparameters
[i
]
1677 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1678 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1685 self.is_typed
= true
1691 redef class ANewExpr
1692 # The constructor invoked by the new.
1693 var callsite
: nullable CallSite
1695 # The designated type
1696 var recvtype
: nullable MClassType
1698 redef fun accept_typing
(v
)
1700 var recvtype
= v
.resolve_mtype
(self.n_type
)
1701 if recvtype
== null then return
1703 if not recvtype
isa MClassType then
1704 if recvtype
isa MNullableType then
1705 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1708 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1713 self.recvtype
= recvtype
1722 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1723 if callsite
== null then return
1725 if not callsite
.mproperty
.is_new
then
1726 var kind
= recvtype
.mclass
.kind
1727 if kind
!= concrete_kind
then
1728 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1731 self.mtype
= recvtype
1733 self.mtype
= callsite
.msignature
.return_mtype
1734 assert self.mtype
!= null
1737 self.callsite
= callsite
1739 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1740 v
.error
(self, "Error: {name} is not a constructor.")
1744 var args
= n_args
.to_a
1745 callsite
.check_signature
(v
, args
)
1751 redef class AAttrFormExpr
1752 # The attribute acceded.
1753 var mproperty
: nullable MAttribute
1755 # The static type of the attribute.
1756 var attr_type
: nullable MType
1758 # Resolve the attribute acceded.
1759 private fun resolve_property
(v
: TypeVisitor)
1761 var recvtype
= v
.visit_expr
(self.n_expr
)
1762 if recvtype
== null then return # Skip error
1763 var name
= self.n_id
.text
1764 if recvtype
isa MNullType then
1765 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1769 var unsafe_type
= v
.anchor_to
(recvtype
)
1770 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1771 if mproperty
== null then
1772 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1775 assert mproperty
isa MAttribute
1776 self.mproperty
= mproperty
1778 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1779 assert mpropdefs
.length
== 1
1780 var mpropdef
= mpropdefs
.first
1781 var attr_type
= mpropdef
.static_mtype
.as(not null)
1782 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1783 self.attr_type
= attr_type
1787 redef class AAttrExpr
1788 redef fun accept_typing
(v
)
1790 self.resolve_property
(v
)
1791 self.mtype
= self.attr_type
1796 redef class AAttrAssignExpr
1797 redef fun accept_typing
(v
)
1799 self.resolve_property
(v
)
1800 var mtype
= self.attr_type
1802 v
.visit_expr_subtype
(self.n_value
, mtype
)
1803 self.is_typed
= true
1807 redef class AAttrReassignExpr
1808 redef fun accept_typing
(v
)
1810 self.resolve_property
(v
)
1811 var mtype
= self.attr_type
1812 if mtype
== null then return # Skip error
1814 self.resolve_reassignment
(v
, mtype
, mtype
)
1816 self.is_typed
= true
1820 redef class AIssetAttrExpr
1821 redef fun accept_typing
(v
)
1823 self.resolve_property
(v
)
1824 var mtype
= self.attr_type
1825 if mtype
== null then return # Skip error
1827 var recvtype
= self.n_expr
.mtype
.as(not null)
1828 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1829 if bound
isa MNullableType then
1830 v
.error
(self, "Error: isset on a nullable attribute.")
1832 self.mtype
= v
.type_bool
(self)
1836 redef class AVarargExpr
1837 redef fun accept_typing
(v
)
1839 # This kind of pseudo-expression can be only processed trough a signature
1840 # See `check_signature`
1841 # Other cases are a syntax error.
1842 v
.error
(self, "Syntax error: unexpected `...`")
1848 redef class ADebugTypeExpr
1849 redef fun accept_typing
(v
)
1851 var expr
= v
.visit_expr
(self.n_expr
)
1852 if expr
== null then return
1853 var unsafe
= v
.anchor_to
(expr
)
1854 var ntype
= self.n_type
1855 var mtype
= v
.resolve_mtype
(ntype
)
1856 if mtype
!= null and mtype
!= expr
then
1857 var umtype
= v
.anchor_to
(mtype
)
1858 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1860 self.is_typed
= true