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 private 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}")
638 redef class ABlockExpr
639 redef fun accept_typing
(v
)
641 for e
in self.n_expr
do v
.visit_stmt
(e
)
645 # The type of a blockexpr is the one of the last expression (or null if empty)
648 if self.n_expr
.is_empty
then return null
649 return self.n_expr
.last
.mtype
653 redef class AVardeclExpr
654 redef fun accept_typing
(v
)
656 var variable
= self.variable
657 if variable
== null then return # Skip error
659 var ntype
= self.n_type
660 var mtype
: nullable MType
661 if ntype
== null then
664 mtype
= v
.resolve_mtype
(ntype
)
665 if mtype
== null then return # Skip error
668 var nexpr
= self.n_expr
669 if nexpr
!= null then
670 if mtype
!= null then
671 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
672 if etype
== mtype
then
674 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
677 mtype
= v
.visit_expr
(nexpr
)
678 if mtype
== null then return # Skip error
683 if mtype
== null or mtype
isa MNullType then
684 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
685 if mtype
== null then mtype
= decltype
688 variable
.declared_type
= decltype
689 v
.set_variable
(self, variable
, mtype
)
691 #debug("var {variable}: {mtype}")
698 redef fun its_variable
do return self.variable
699 redef fun accept_typing
(v
)
701 var variable
= self.variable
702 if variable
== null then return # Skip error
704 var mtype
= v
.get_variable
(self, variable
)
705 if mtype
!= null then
706 #debug("{variable} is {mtype}")
708 #debug("{variable} is untyped")
715 redef class AVarAssignExpr
716 redef fun accept_typing
(v
)
718 var variable
= self.variable
719 assert variable
!= null
721 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
723 v
.set_variable
(self, variable
, mtype
)
729 redef class AReassignFormExpr
730 # The method designed by the reassign operator.
731 var reassign_callsite
: nullable CallSite
733 var read_type
: nullable MType = null
735 # Determine the `reassign_property`
736 # `readtype` is the type of the reading of the left value.
737 # `writetype` is the type of the writing of the left value.
738 # (Because of `ACallReassignExpr`, both can be different.
739 # Return the static type of the value to store.
740 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
742 var reassign_name
: String
743 if self.n_assign_op
isa APlusAssignOp then
745 else if self.n_assign_op
isa AMinusAssignOp then
751 self.read_type
= readtype
753 if readtype
isa MNullType then
754 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
758 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
759 if callsite
== null then return null # Skip error
760 self.reassign_callsite
= callsite
762 var msignature
= callsite
.msignature
763 var rettype
= msignature
.return_mtype
764 assert msignature
.arity
== 1 and rettype
!= null
766 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
767 if value_type
== null then return null # Skip error
769 v
.check_subtype
(self, rettype
, writetype
)
774 redef class AVarReassignExpr
775 redef fun accept_typing
(v
)
777 var variable
= self.variable
778 assert variable
!= null
780 var readtype
= v
.get_variable
(self, variable
)
781 if readtype
== null then return
785 var writetype
= variable
.declared_type
786 if writetype
== null then return
788 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
790 v
.set_variable
(self, variable
, rettype
)
797 redef class AContinueExpr
798 redef fun accept_typing
(v
)
800 var nexpr
= self.n_expr
801 if nexpr
!= null then
808 redef class ABreakExpr
809 redef fun accept_typing
(v
)
811 var nexpr
= self.n_expr
812 if nexpr
!= null then
819 redef class AReturnExpr
820 redef fun accept_typing
(v
)
822 var nexpr
= self.n_expr
824 var mpropdef
= v
.mpropdef
825 if mpropdef
isa MMethodDef then
826 ret_type
= mpropdef
.msignature
.return_mtype
827 else if mpropdef
isa MAttributeDef then
828 ret_type
= mpropdef
.static_mtype
832 if nexpr
!= null then
833 if ret_type
!= null then
834 v
.visit_expr_subtype
(nexpr
, ret_type
)
837 v
.error
(self, "Error: Return with value in a procedure.")
839 else if ret_type
!= null then
840 v
.error
(self, "Error: Return without value in a function.")
846 redef class AAbortExpr
847 redef fun accept_typing
(v
)
854 redef fun accept_typing
(v
)
856 v
.visit_expr_bool
(n_expr
)
864 redef class AIfexprExpr
865 redef fun accept_typing
(v
)
867 v
.visit_expr_bool
(n_expr
)
869 var t1
= v
.visit_expr
(n_then
)
870 var t2
= v
.visit_expr
(n_else
)
872 if t1
== null or t2
== null then
876 var t
= v
.merge_types
(self, [t1
, t2
])
878 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
885 redef fun accept_typing
(v
)
887 v
.visit_stmt
(n_block
)
892 redef class AWhileExpr
893 redef fun accept_typing
(v
)
895 v
.visit_expr_bool
(n_expr
)
897 v
.visit_stmt
(n_block
)
902 redef class ALoopExpr
903 redef fun accept_typing
(v
)
905 v
.visit_stmt
(n_block
)
911 var coltype
: nullable MClassType
913 var method_iterator
: nullable CallSite
914 var method_is_ok
: nullable CallSite
915 var method_item
: nullable CallSite
916 var method_next
: nullable CallSite
917 var method_key
: nullable CallSite
918 var method_finish
: nullable CallSite
920 var method_lt
: nullable CallSite
921 var method_successor
: nullable CallSite
923 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
925 if mtype
isa MNullType then
926 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
931 var objcla
= v
.get_mclass
(self, "Object")
932 if objcla
== null then return
934 # check iterator method
935 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
936 if itdef
== null then
937 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
940 self.method_iterator
= itdef
942 # check that iterator return something
943 var ittype
= itdef
.msignature
.return_mtype
944 if ittype
== null then
945 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
950 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
951 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
955 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
957 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
958 var variables
= self.variables
959 if variables
.length
!= 1 then
960 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
962 variables
.first
.declared_type
= coltype
.arguments
.first
967 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
969 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
970 var variables
= self.variables
971 if variables
.length
!= 2 then
972 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
974 variables
[0].declared_type
= coltype
.arguments
[0]
975 variables
[1].declared_type
= coltype
.arguments
[1]
980 if not is_col
and not is_map
then
981 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
985 # anchor formal and virtual types
986 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
988 mtype
= mtype
.as_notnullable
989 self.coltype
= mtype
.as(MClassType)
991 # get methods is_ok, next, item
992 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
993 if ikdef
== null then
994 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
997 self.method_is_ok
= ikdef
999 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1000 if itemdef
== null then
1001 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1004 self.method_item
= itemdef
1006 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1007 if nextdef
== null then
1008 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1011 self.method_next
= nextdef
1013 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1016 var keydef
= v
.get_method
(self, ittype
, "key", false)
1017 if keydef
== null then
1018 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1021 self.method_key
= keydef
1024 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1025 var variable
= variables
.first
1026 var vtype
= variable
.declared_type
.as(not null)
1028 if n_expr
isa AOrangeExpr then
1029 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1031 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1034 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1038 redef fun accept_typing
(v
)
1040 var mtype
= v
.visit_expr
(n_expr
)
1041 if mtype
== null then return
1043 self.do_type_iterator
(v
, mtype
)
1045 v
.visit_stmt
(n_block
)
1046 self.is_typed
= true
1050 redef class AAssertExpr
1051 redef fun accept_typing
(v
)
1053 v
.visit_expr_bool
(n_expr
)
1055 v
.visit_stmt
(n_else
)
1056 self.is_typed
= true
1061 redef fun accept_typing
(v
)
1063 v
.visit_expr_bool
(n_expr
)
1064 v
.visit_expr_bool
(n_expr2
)
1065 self.mtype
= v
.type_bool
(self)
1069 redef class AImpliesExpr
1070 redef fun accept_typing
(v
)
1072 v
.visit_expr_bool
(n_expr
)
1073 v
.visit_expr_bool
(n_expr2
)
1074 self.mtype
= v
.type_bool
(self)
1078 redef class AAndExpr
1079 redef fun accept_typing
(v
)
1081 v
.visit_expr_bool
(n_expr
)
1082 v
.visit_expr_bool
(n_expr2
)
1083 self.mtype
= v
.type_bool
(self)
1088 redef class ANotExpr
1089 redef fun accept_typing
(v
)
1091 v
.visit_expr_bool
(n_expr
)
1092 self.mtype
= v
.type_bool
(self)
1096 redef class AOrElseExpr
1097 redef fun accept_typing
(v
)
1099 var t1
= v
.visit_expr
(n_expr
)
1100 var t2
= v
.visit_expr
(n_expr2
)
1102 if t1
== null or t2
== null then
1106 t1
= t1
.as_notnullable
1108 var t
= v
.merge_types
(self, [t1
, t2
])
1110 t
= v
.mmodule
.object_type
1111 if t2
isa MNullableType then
1114 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1120 redef class ATrueExpr
1121 redef fun accept_typing
(v
)
1123 self.mtype
= v
.type_bool
(self)
1127 redef class AFalseExpr
1128 redef fun accept_typing
(v
)
1130 self.mtype
= v
.type_bool
(self)
1134 redef class AIntExpr
1135 redef fun accept_typing
(v
)
1137 var mclass
= v
.get_mclass
(self, "Int")
1138 if mclass
== null then return # Forward error
1139 self.mtype
= mclass
.mclass_type
1143 redef class AFloatExpr
1144 redef fun accept_typing
(v
)
1146 var mclass
= v
.get_mclass
(self, "Float")
1147 if mclass
== null then return # Forward error
1148 self.mtype
= mclass
.mclass_type
1152 redef class ACharExpr
1153 redef fun accept_typing
(v
)
1155 var mclass
= v
.get_mclass
(self, "Char")
1156 if mclass
== null then return # Forward error
1157 self.mtype
= mclass
.mclass_type
1161 redef class AStringFormExpr
1162 redef fun accept_typing
(v
)
1164 var mclass
= v
.get_mclass
(self, "String")
1165 if mclass
== null then return # Forward error
1166 self.mtype
= mclass
.mclass_type
1170 redef class ASuperstringExpr
1171 redef fun accept_typing
(v
)
1173 var mclass
= v
.get_mclass
(self, "String")
1174 if mclass
== null then return # Forward error
1175 self.mtype
= mclass
.mclass_type
1176 for nexpr
in self.n_exprs
do
1177 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1182 redef class AArrayExpr
1183 var with_capacity_callsite
: nullable CallSite
1184 var push_callsite
: nullable CallSite
1186 redef fun accept_typing
(v
)
1188 var mtype
: nullable MType = null
1189 var ntype
= self.n_type
1190 if ntype
!= null then
1191 mtype
= v
.resolve_mtype
(ntype
)
1192 if mtype
== null then return # Skip error
1194 var mtypes
= new Array[nullable MType]
1196 for e
in self.n_exprs
.n_exprs
do
1197 var t
= v
.visit_expr
(e
)
1201 if mtype
!= null then
1202 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1203 if t
== mtype
then useless
= true
1208 if mtype
== null then
1209 mtype
= v
.merge_types
(self, mtypes
)
1211 if mtype
== null then
1212 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1216 assert ntype
!= null
1217 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1219 var mclass
= v
.get_mclass
(self, "Array")
1220 if mclass
== null then return # Forward error
1221 var array_mtype
= mclass
.get_mtype
([mtype
])
1223 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1224 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1226 self.mtype
= array_mtype
1230 redef class ARangeExpr
1231 var init_callsite
: nullable CallSite
1233 redef fun accept_typing
(v
)
1235 var discrete_class
= v
.get_mclass
(self, "Discrete")
1236 if discrete_class
== null then return # Forward error
1237 var discrete_type
= discrete_class
.intro
.bound_mtype
1238 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1239 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1240 if t1
== null or t2
== null then return
1241 var mclass
= v
.get_mclass
(self, "Range")
1242 if mclass
== null then return # Forward error
1244 if v
.is_subtype
(t1
, t2
) then
1245 mtype
= mclass
.get_mtype
([t2
])
1246 else if v
.is_subtype
(t2
, t1
) then
1247 mtype
= mclass
.get_mtype
([t1
])
1249 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1255 # get the constructor
1257 if self isa ACrangeExpr then
1258 callsite
= v
.get_method
(self, mtype
, "init", false)
1259 else if self isa AOrangeExpr then
1260 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1264 init_callsite
= callsite
1268 redef class ANullExpr
1269 redef fun accept_typing
(v
)
1271 self.mtype
= v
.mmodule
.model
.null_type
1275 redef class AIsaExpr
1276 # The static type to cast to.
1277 # (different from the static type of the expression that is `Bool`).
1278 var cast_type
: nullable MType
1279 redef fun accept_typing
(v
)
1281 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1282 self.cast_type
= mtype
1284 var variable
= self.n_expr
.its_variable
1285 if variable
!= null then
1286 #var orig = self.n_expr.mtype
1287 #var from = if orig != null then orig.to_s else "invalid"
1288 #var to = if mtype != null then mtype.to_s else "invalid"
1289 #debug("adapt {variable}: {from} -> {to}")
1290 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1293 self.mtype
= v
.type_bool
(self)
1297 redef class AAsCastExpr
1298 redef fun accept_typing
(v
)
1300 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1304 redef class AAsNotnullExpr
1305 redef fun accept_typing
(v
)
1307 var mtype
= v
.visit_expr
(self.n_expr
)
1308 if mtype
== null then return # Forward error
1310 if mtype
isa MNullType then
1311 v
.error
(self, "Type error: as(not null) on null")
1314 if mtype
isa MNullableType then
1315 self.mtype
= mtype
.mtype
1320 if mtype
isa MClassType then
1321 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1324 assert mtype
.need_anchor
1325 var u
= v
.anchor_to
(mtype
)
1326 if not u
isa MNullableType then
1327 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1333 redef class AParExpr
1334 redef fun accept_typing
(v
)
1336 self.mtype
= v
.visit_expr
(self.n_expr
)
1340 redef class AOnceExpr
1341 redef fun accept_typing
(v
)
1343 self.mtype
= v
.visit_expr
(self.n_expr
)
1347 redef class ASelfExpr
1348 redef var its_variable
: nullable Variable
1349 redef fun accept_typing
(v
)
1351 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1352 v
.error
(self, "Error: self cannot be used in top-level method.")
1354 var variable
= v
.selfvariable
1355 self.its_variable
= variable
1356 self.mtype
= v
.get_variable
(self, variable
)
1360 ## MESSAGE SENDING AND PROPERTY
1362 redef class ASendExpr
1363 # The property invoked by the send.
1364 var callsite
: nullable CallSite
1366 redef fun accept_typing
(v
)
1368 var recvtype
= v
.visit_expr
(self.n_expr
)
1369 var name
= self.property_name
1371 if recvtype
== null then return # Forward error
1372 if recvtype
isa MNullType then
1373 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1377 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1378 if callsite
== null then return
1379 self.callsite
= callsite
1380 var msignature
= callsite
.msignature
1382 var args
= compute_raw_arguments
1384 callsite
.check_signature
(v
, args
)
1386 if callsite
.mproperty
.is_init
then
1387 var vmpropdef
= v
.mpropdef
1388 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1389 v
.error
(self, "Can call a init only in another init")
1391 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1392 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1396 var ret
= msignature
.return_mtype
1400 self.is_typed
= true
1404 # The name of the property
1405 # Each subclass simply provide the correct name.
1406 private fun property_name
: String is abstract
1408 # An array of all arguments (excluding self)
1409 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1411 private fun compute_raw_arguments
: Array[AExpr] is abstract
1414 redef class ABinopExpr
1415 redef fun compute_raw_arguments
do return [n_expr2
]
1418 redef fun property_name
do return "=="
1419 redef fun accept_typing
(v
)
1426 redef fun property_name
do return "!="
1427 redef fun accept_typing
(v
)
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 ">="
1449 redef fun property_name
do return ">>"
1451 redef class APlusExpr
1452 redef fun property_name
do return "+"
1454 redef class AMinusExpr
1455 redef fun property_name
do return "-"
1457 redef class AStarshipExpr
1458 redef fun property_name
do return "<=>"
1460 redef class AStarExpr
1461 redef fun property_name
do return "*"
1463 redef class AStarstarExpr
1464 redef fun property_name
do return "**"
1466 redef class ASlashExpr
1467 redef fun property_name
do return "/"
1469 redef class APercentExpr
1470 redef fun property_name
do return "%"
1473 redef class AUminusExpr
1474 redef fun property_name
do return "unary -"
1475 redef fun compute_raw_arguments
do return new Array[AExpr]
1479 redef class ACallExpr
1480 redef fun property_name
do return n_id
.text
1481 redef fun compute_raw_arguments
do return n_args
.to_a
1484 redef class ACallAssignExpr
1485 redef fun property_name
do return n_id
.text
+ "="
1486 redef fun compute_raw_arguments
1488 var res
= n_args
.to_a
1494 redef class ABraExpr
1495 redef fun property_name
do return "[]"
1496 redef fun compute_raw_arguments
do return n_args
.to_a
1499 redef class ABraAssignExpr
1500 redef fun property_name
do return "[]="
1501 redef fun compute_raw_arguments
1503 var res
= n_args
.to_a
1509 redef class ASendReassignFormExpr
1510 # The property invoked for the writing
1511 var write_callsite
: nullable CallSite
1513 redef fun accept_typing
(v
)
1515 var recvtype
= v
.visit_expr
(self.n_expr
)
1516 var name
= self.property_name
1518 if recvtype
== null then return # Forward error
1519 if recvtype
isa MNullType then
1520 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1524 var for_self
= self.n_expr
isa ASelfExpr
1525 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1527 if callsite
== null then return
1528 self.callsite
= callsite
1530 var args
= compute_raw_arguments
1532 callsite
.check_signature
(v
, args
)
1534 var readtype
= callsite
.msignature
.return_mtype
1535 if readtype
== null then
1536 v
.error
(self, "Error: {name} is not a function")
1540 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1541 if wcallsite
== null then return
1542 self.write_callsite
= wcallsite
1544 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1545 if wtype
== null then return
1547 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1548 args
.add
(self.n_value
)
1549 wcallsite
.check_signature
(v
, args
)
1551 self.is_typed
= true
1555 redef class ACallReassignExpr
1556 redef fun property_name
do return n_id
.text
1557 redef fun compute_raw_arguments
do return n_args
.to_a
1560 redef class ABraReassignExpr
1561 redef fun property_name
do return "[]"
1562 redef fun compute_raw_arguments
do return n_args
.to_a
1565 redef class AInitExpr
1566 redef fun property_name
do return "init"
1567 redef fun compute_raw_arguments
do return n_args
.to_a
1571 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1576 redef class ASuperExpr
1577 # The method to call if the super is in fact a 'super init call'
1578 # Note: if the super is a normal call-next-method, then this attribute is null
1579 var callsite
: nullable CallSite
1581 # The method to call is the super is a standard `call-next-method` super-call
1582 # Note: if the super is a special super-init-call, then this attribute is null
1583 var mpropdef
: nullable MMethodDef
1585 redef fun accept_typing
(v
)
1587 var anchor
= v
.anchor
1588 assert anchor
!= null
1589 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1590 assert recvtype
!= null
1591 var mproperty
= v
.mpropdef
.mproperty
1592 if not mproperty
isa MMethod then
1593 v
.error
(self, "Error: super only usable in a method")
1596 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1597 if superprops
.length
== 0 then
1598 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1599 process_superinit
(v
)
1602 v
.error
(self, "Error: No super method to call for {mproperty}.")
1605 # FIXME: covariance of return type in linear extension?
1606 var superprop
= superprops
.first
1608 var msignature
= superprop
.msignature
.as(not null)
1609 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1610 var args
= self.n_args
.to_a
1611 if args
.length
> 0 then
1612 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1614 self.mtype
= msignature
.return_mtype
1615 self.is_typed
= true
1616 v
.mpropdef
.has_supercall
= true
1617 mpropdef
= v
.mpropdef
.as(MMethodDef)
1620 private fun process_superinit
(v
: TypeVisitor)
1622 var anchor
= v
.anchor
1623 assert anchor
!= null
1624 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1625 assert recvtype
!= null
1626 var mpropdef
= v
.mpropdef
1627 assert mpropdef
isa MMethodDef
1628 var mproperty
= mpropdef
.mproperty
1629 var superprop
: nullable MMethodDef = null
1630 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1631 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1632 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1633 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1634 if candidate
== null then
1635 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1636 continue # Try next super-class
1638 if superprop
!= null and candidate
.is_root_init
then
1641 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1642 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1645 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1646 if superprop
!= null and superprop
.mproperty
== candidate
then
1647 if superprop
== candidatedefs
.first
then continue
1648 candidatedefs
.add
(superprop
)
1650 if candidatedefs
.length
> 1 then
1651 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1654 superprop
= candidatedefs
.first
1656 if superprop
== null then
1657 v
.error
(self, "Error: No super method to call for {mproperty}.")
1661 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1662 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1664 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1665 self.callsite
= callsite
1667 var args
= self.n_args
.to_a
1668 if args
.length
> 0 then
1669 callsite
.check_signature
(v
, args
)
1671 # Check there is at least enough parameters
1672 if mpropdef
.msignature
.arity
< msignature
.arity
then
1673 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1676 # Check that each needed parameter is conform
1678 for sp
in msignature
.mparameters
do
1679 var p
= mpropdef
.msignature
.mparameters
[i
]
1680 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1681 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1688 self.is_typed
= true
1694 redef class ANewExpr
1695 # The constructor invoked by the new.
1696 var callsite
: nullable CallSite
1698 # The designated type
1699 var recvtype
: nullable MClassType
1701 redef fun accept_typing
(v
)
1703 var recvtype
= v
.resolve_mtype
(self.n_type
)
1704 if recvtype
== null then return
1706 if not recvtype
isa MClassType then
1707 if recvtype
isa MNullableType then
1708 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1711 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1716 self.recvtype
= recvtype
1725 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1726 if callsite
== null then return
1728 if not callsite
.mproperty
.is_new
then
1729 var kind
= recvtype
.mclass
.kind
1730 if kind
!= concrete_kind
then
1731 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1734 self.mtype
= recvtype
1736 self.mtype
= callsite
.msignature
.return_mtype
1737 assert self.mtype
!= null
1740 self.callsite
= callsite
1742 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1743 v
.error
(self, "Error: {name} is not a constructor.")
1747 var args
= n_args
.to_a
1748 callsite
.check_signature
(v
, args
)
1754 redef class AAttrFormExpr
1755 # The attribute acceded.
1756 var mproperty
: nullable MAttribute
1758 # The static type of the attribute.
1759 var attr_type
: nullable MType
1761 # Resolve the attribute acceded.
1762 private fun resolve_property
(v
: TypeVisitor)
1764 var recvtype
= v
.visit_expr
(self.n_expr
)
1765 if recvtype
== null then return # Skip error
1766 var name
= self.n_id
.text
1767 if recvtype
isa MNullType then
1768 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1772 var unsafe_type
= v
.anchor_to
(recvtype
)
1773 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1774 if mproperty
== null then
1775 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1778 assert mproperty
isa MAttribute
1779 self.mproperty
= mproperty
1781 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1782 assert mpropdefs
.length
== 1
1783 var mpropdef
= mpropdefs
.first
1784 var attr_type
= mpropdef
.static_mtype
.as(not null)
1785 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1786 self.attr_type
= attr_type
1790 redef class AAttrExpr
1791 redef fun accept_typing
(v
)
1793 self.resolve_property
(v
)
1794 self.mtype
= self.attr_type
1799 redef class AAttrAssignExpr
1800 redef fun accept_typing
(v
)
1802 self.resolve_property
(v
)
1803 var mtype
= self.attr_type
1805 v
.visit_expr_subtype
(self.n_value
, mtype
)
1806 self.is_typed
= true
1810 redef class AAttrReassignExpr
1811 redef fun accept_typing
(v
)
1813 self.resolve_property
(v
)
1814 var mtype
= self.attr_type
1815 if mtype
== null then return # Skip error
1817 self.resolve_reassignment
(v
, mtype
, mtype
)
1819 self.is_typed
= true
1823 redef class AIssetAttrExpr
1824 redef fun accept_typing
(v
)
1826 self.resolve_property
(v
)
1827 var mtype
= self.attr_type
1828 if mtype
== null then return # Skip error
1830 var recvtype
= self.n_expr
.mtype
.as(not null)
1831 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1832 if bound
isa MNullableType then
1833 v
.error
(self, "Error: isset on a nullable attribute.")
1835 self.mtype
= v
.type_bool
(self)
1839 redef class AVarargExpr
1840 redef fun accept_typing
(v
)
1842 # This kind of pseudo-expression can be only processed trough a signature
1843 # See `check_signature`
1844 # Other cases are a syntax error.
1845 v
.error
(self, "Syntax error: unexpected `...`")
1851 redef class ADebugTypeExpr
1852 redef fun accept_typing
(v
)
1854 var expr
= v
.visit_expr
(self.n_expr
)
1855 if expr
== null then return
1856 var unsafe
= v
.anchor_to
(expr
)
1857 var ntype
= self.n_type
1858 var mtype
= v
.resolve_mtype
(ntype
)
1859 if mtype
!= null and mtype
!= expr
then
1860 var umtype
= v
.anchor_to
(mtype
)
1861 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1863 self.is_typed
= true