1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Intraprocedural resolution of static types and OO-services
18 # By OO-services we mean message sending, attribute access, instantiation, etc.
24 redef class ToolContext
25 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
28 private class TypingPhase
30 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
33 private class TypeVisitor
34 var modelbuilder
: ModelBuilder
36 # The module of the analysis
37 # Used to correctly query the model
40 # The static type of the receiver
41 # Mainly used for type tests and type resolutions
42 var anchor
: nullable MClassType
44 # The analyzed mclassdef
45 var mclassdef
: nullable MClassDef
47 # The analyzed property
48 var mpropdef
: nullable MPropDef
50 var selfvariable
= new Variable("self")
52 # Is `self` use restricted?
53 # * no explicit `self`
54 # * method called on the implicit self must be top-level
55 var is_toplevel_context
= false
57 init(modelbuilder
: ModelBuilder, mmodule
: MModule, mpropdef
: nullable MPropDef)
59 self.modelbuilder
= modelbuilder
60 self.mmodule
= mmodule
62 if mpropdef
!= null then
63 self.mpropdef
= mpropdef
64 var mclassdef
= mpropdef
.mclassdef
65 self.mclassdef
= mclassdef
66 self.anchor
= mclassdef
.bound_mtype
68 var mclass
= mclassdef
.mclass
70 var selfvariable
= new Variable("self")
71 self.selfvariable
= selfvariable
72 selfvariable
.declared_type
= mclass
.mclass_type
74 var mprop
= mpropdef
.mproperty
75 if mprop
isa MMethod and mprop
.is_toplevel
then
76 is_toplevel_context
= true
81 fun anchor_to
(mtype
: MType): MType
84 if anchor
== null then
85 assert not mtype
.need_anchor
88 return mtype
.anchor_to
(mmodule
, anchor
)
91 fun is_subtype
(sub
, sup
: MType): Bool
93 return sub
.is_subtype
(mmodule
, anchor
, sup
)
96 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
98 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
99 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
103 # Check that `sub` is a subtype of `sup`.
104 # If `sub` is not a valid suptype, then display an error on `node` an return null.
105 # If `sub` is a safe subtype of `sup` then return `sub`.
106 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
108 # The point of the return type is to determinate the usable type on an expression:
109 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
110 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
111 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
113 if self.is_subtype
(sub
, sup
) then return sub
114 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
115 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
116 #node.debug("Unsafe typing: expected {sup}, got {sub}")
119 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
123 # Visit an expression and do not care about the return value
124 fun visit_stmt
(nexpr
: nullable AExpr)
126 if nexpr
== null then return
127 nexpr
.accept_typing
(self)
130 # Visit an expression and expects that it is not a statement
131 # Return the type of the expression
132 # Display an error and return null if:
133 # * the type cannot be determined or
134 # * `nexpr` is a statement
135 fun visit_expr
(nexpr
: AExpr): nullable MType
137 nexpr
.accept_typing
(self)
138 var mtype
= nexpr
.mtype
139 if mtype
!= null then return mtype
140 if not nexpr
.is_typed
then
141 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
142 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
143 nexpr
.debug
("No return type but no error.")
146 return null # forward error
148 self.error
(nexpr
, "Type error: expected expression.")
152 # Visit an expression and expect its static type is a least a `sup`
153 # Return the type of the expression or null if
154 # * the type cannot be determined or
155 # * `nexpr` is a statement or
156 # * `nexpr` is not a `sup`
157 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
159 var sub
= visit_expr
(nexpr
)
160 if sub
== null then return null # Forward error
162 if sup
== null then return null # Forward error
164 var res
= check_subtype
(nexpr
, sub
, sup
)
166 nexpr
.implicit_cast_to
= res
171 # Visit an expression and expect its static type is a `Bool`
172 # Return the type of the expression or null if
173 # * the type cannot be determined or
174 # * `nexpr` is a statement or
175 # * `nexpr` is not a `Bool`
176 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
178 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
182 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
184 var sub
= visit_expr
(nexpr
)
185 if sub
== null then return null # Forward error
187 var sup
= self.resolve_mtype
(ntype
)
188 if sup
== null then return null # Forward error
191 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup}.")
192 else if self.is_subtype
(sub
, sup
) then
193 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup} since it is a {sub}.")
198 # Special verification on != and == for null
200 fun null_test
(anode
: ABinopExpr)
202 var mtype
= anode
.n_expr
.mtype
203 var mtype2
= anode
.n_expr2
.mtype
205 if mtype
== null or mtype2
== null then return
207 if not mtype2
isa MNullType then return
209 # Check of useless null
210 if not mtype
isa MNullableType then
211 if not anchor_to
(mtype
) isa MNullableType then
212 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
217 # Check for type adaptation
218 var variable
= anode
.n_expr
.its_variable
219 if variable
== null then return
221 if anode
isa AEqExpr then
222 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
223 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
.mtype
)
224 else if anode
isa ANeExpr then
225 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
226 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
.mtype
)
232 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
234 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
237 fun resolve_mtype
(node
: AType): nullable MType
239 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
242 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
244 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
248 fun get_mclass
(node
: ANode, name
: String): nullable MClass
250 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
251 if mclass
== null then
252 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
257 fun type_bool
(node
: ANode): nullable MType
259 var mclass
= self.get_mclass
(node
, "Bool")
260 if mclass
== null then return null
261 return mclass
.mclass_type
264 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
266 var unsafe_type
= self.anchor_to
(recvtype
)
268 #debug("recv: {recvtype} (aka {unsafe_type})")
269 if recvtype
isa MNullType then
270 self.error
(node
, "Error: Method '{name}' call on 'null'.")
274 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
275 if mproperty
== null then
276 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
278 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
280 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
285 assert mproperty
isa MMethod
287 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
288 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
290 if not recv_is_self
and mproperty
.is_toplevel
then
291 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
294 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
295 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
299 var info
= mproperty
.deprecation
300 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
303 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
305 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
309 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
311 if propdefs
.length
== 0 then
312 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
314 else if propdefs
.length
== 1 then
315 mpropdef
= propdefs
.first
317 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
318 mpropdef
= mproperty
.intro
322 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
323 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
325 var erasure_cast
= false
326 var rettype
= mpropdef
.msignature
.return_mtype
327 if not recv_is_self
and rettype
!= null then
328 rettype
= rettype
.as_notnullable
329 if rettype
isa MParameterType then
330 var erased_rettype
= msignature
.return_mtype
331 assert erased_rettype
!= null
332 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
337 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
341 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
343 var unsafe_type
= self.anchor_to
(recvtype
)
344 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
345 if mproperty
== null then return null
346 return get_method
(node
, recvtype
, name
, recv_is_self
)
350 # Visit the expressions of args and check their conformity with the corresponding type in signature
351 # The point of this method is to handle varargs correctly
352 # Note: The signature must be correctly adapted
353 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
355 var vararg_rank
= msignature
.vararg_rank
356 if vararg_rank
>= 0 then
357 if args
.length
< msignature
.arity
then
358 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
359 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
362 else if args
.length
!= msignature
.arity
then
363 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
367 #debug("CALL {unsafe_type}.{msignature}")
369 var vararg_decl
= args
.length
- msignature
.arity
370 for i
in [0..msignature
.arity
[ do
372 if i
== vararg_rank
then continue # skip the vararg
373 if i
> vararg_rank
then
376 var paramtype
= msignature
.mparameters
[i
].mtype
377 self.visit_expr_subtype
(args
[j
], paramtype
)
379 if vararg_rank
>= 0 then
380 var varargs
= new Array[AExpr]
381 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
382 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
384 self.visit_expr_subtype
(args
[j
], paramtype
)
390 fun error
(node
: ANode, message
: String)
392 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
395 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
397 var flow
= node
.after_flow_context
399 self.error
(node
, "No context!")
403 if flow
.vars
.has_key
(variable
) then
404 return flow
.vars
[variable
]
406 #node.debug("*** START Collected for {variable}")
407 var mtypes
= flow
.collect_types
(variable
)
408 #node.debug("**** END Collected for {variable}")
409 if mtypes
== null or mtypes
.length
== 0 then
410 return variable
.declared_type
411 else if mtypes
.length
== 1 then
414 var res
= merge_types
(node
,mtypes
)
415 if res
== null then res
= variable
.declared_type
421 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
423 var flow
= node
.after_flow_context
426 flow
.set_var
(variable
, mtype
)
429 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
431 if col
.length
== 1 then return col
.first
433 if t1
== null then continue # return null
436 if t2
== null then continue # return null
437 if t2
isa MNullableType or t2
isa MNullType then
440 if not is_subtype
(t2
, t1
) then found
= false
443 #print "merge {col.join(" ")} -> {t1}"
447 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
452 # A specific method call site with its associated informations.
454 # The associated node for location
457 # The static type of the receiver (possibly unresolved)
460 # The module where the callsite is present
463 # The anchor to use with `recv` or `msignature`
464 var anchor
: nullable MClassType
466 # Is the receiver self?
467 # If "for_self", virtual types of the signature are kept
468 # If "not_for_self", virtual type are erased
469 var recv_is_self
: Bool
471 # The designated method
472 var mproperty
: MMethod
474 # The statically designated method definition
475 # The most specif one, it is.
476 var mpropdef
: MMethodDef
478 # The resolved signature for the receiver
479 var msignature
: MSignature
481 # Is a implicit cast required on erasure typing policy?
482 var erasure_cast
: Bool
484 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
486 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
491 # The declared type of the variable
492 var declared_type
: nullable MType
495 redef class FlowContext
496 # Store changes of types because of type evolution
497 private var vars
= new HashMap[Variable, nullable MType]
498 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
500 # Adapt the variable to a static type
501 # Warning1: do not modify vars directly.
502 # Warning2: sub-flow may have cached a unadapted variable
503 private fun set_var
(variable
: Variable, mtype
: nullable MType)
505 self.vars
[variable
] = mtype
506 self.cache
.keys
.remove
(variable
)
509 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
511 if cache
.has_key
(variable
) then
512 return cache
[variable
]
514 var res
: nullable Array[nullable MType] = null
515 if vars
.has_key
(variable
) then
516 var mtype
= vars
[variable
]
518 else if self.previous
.is_empty
then
520 res
= [variable
.declared_type
]
522 for flow
in self.previous
do
523 if flow
.is_unreachable
then continue
524 var r2
= flow
.collect_types
(variable
)
525 if r2
== null then continue
530 if not res
.has
(t
) then res
.add
(t
)
535 cache
[variable
] = res
541 # The entry point of the whole typing analysis
542 fun do_typing
(modelbuilder
: ModelBuilder)
546 # The variable associated to the receiver (if any)
547 var selfvariable
: nullable Variable
550 redef class AMethPropdef
551 redef fun do_typing
(modelbuilder
: ModelBuilder)
553 var nblock
= self.n_block
554 if nblock
== null then return
556 var mpropdef
= self.mpropdef
.as(not null)
557 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
558 self.selfvariable
= v
.selfvariable
560 var mmethoddef
= self.mpropdef
.as(not null)
561 for i
in [0..mmethoddef
.msignature
.arity
[ do
562 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
563 if mmethoddef
.msignature
.vararg_rank
== i
then
564 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
565 if arrayclass
== null then return # Skip error
566 mtype
= arrayclass
.get_mtype
([mtype
])
568 var variable
= self.n_signature
.n_params
[i
].variable
569 assert variable
!= null
570 variable
.declared_type
= mtype
574 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
575 # We reach the end of the function without having a return, it is bad
576 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
581 redef class AAttrPropdef
582 redef fun do_typing
(modelbuilder
: ModelBuilder)
584 var mpropdef
= self.mpropdef
.as(not null)
585 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
586 self.selfvariable
= v
.selfvariable
588 var nexpr
= self.n_expr
589 if nexpr
!= null then
590 var mtype
= self.mpropdef
.static_mtype
591 v
.visit_expr_subtype
(nexpr
, mtype
)
599 # The static type of the expression.
600 # null if self is a statement or in case of error
601 var mtype
: nullable MType = null
603 # Is the statement correctly typed?
604 # Used to distinguish errors and statements when `mtype == null`
605 var is_typed
: Bool = false
607 # If required, the following implicit cast `.as(XXX)`
608 # Such a cast may by required after evaluating the expression when
609 # a unsafe operation is detected (silently accepted by the Nit language).
610 # The attribute is computed by `check_subtype`
611 var implicit_cast_to
: nullable MType = null
613 # Return the variable read (if any)
614 # Used to perform adaptive typing
615 fun its_variable
: nullable Variable do return null
617 private fun accept_typing
(v
: TypeVisitor)
619 v
.error
(self, "no implemented accept_typing for {self.class_name}")
623 redef class ABlockExpr
624 redef fun accept_typing
(v
)
626 for e
in self.n_expr
do v
.visit_stmt
(e
)
630 # The type of a blockexpr is the one of the last expression (or null if empty)
633 if self.n_expr
.is_empty
then return null
634 return self.n_expr
.last
.mtype
638 redef class AVardeclExpr
639 redef fun accept_typing
(v
)
641 var variable
= self.variable
642 if variable
== null then return # Skip error
644 var ntype
= self.n_type
645 var mtype
: nullable MType
646 if ntype
== null then
649 mtype
= v
.resolve_mtype
(ntype
)
650 if mtype
== null then return # Skip error
653 var nexpr
= self.n_expr
654 if nexpr
!= null then
655 if mtype
!= null then
656 v
.visit_expr_subtype
(nexpr
, mtype
)
658 mtype
= v
.visit_expr
(nexpr
)
659 if mtype
== null then return # Skip error
664 if mtype
== null or mtype
isa MNullType then
665 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
666 if mtype
== null then mtype
= decltype
669 variable
.declared_type
= decltype
670 v
.set_variable
(self, variable
, mtype
)
672 #debug("var {variable}: {mtype}")
679 redef fun its_variable
do return self.variable
680 redef fun accept_typing
(v
)
682 var variable
= self.variable
683 if variable
== null then return # Skip error
685 var mtype
= v
.get_variable
(self, variable
)
686 if mtype
!= null then
687 #debug("{variable} is {mtype}")
689 #debug("{variable} is untyped")
696 redef class AVarAssignExpr
697 redef fun accept_typing
(v
)
699 var variable
= self.variable
700 assert variable
!= null
702 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
704 v
.set_variable
(self, variable
, mtype
)
710 redef class AReassignFormExpr
711 # The method designed by the reassign operator.
712 var reassign_callsite
: nullable CallSite
714 var read_type
: nullable MType = null
716 # Determine the `reassign_property`
717 # `readtype` is the type of the reading of the left value.
718 # `writetype` is the type of the writing of the left value.
719 # (Because of `ACallReassignExpr`, both can be different.
720 # Return the static type of the value to store.
721 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
723 var reassign_name
: String
724 if self.n_assign_op
isa APlusAssignOp then
726 else if self.n_assign_op
isa AMinusAssignOp then
732 self.read_type
= readtype
734 if readtype
isa MNullType then
735 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
739 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
740 if callsite
== null then return null # Skip error
741 self.reassign_callsite
= callsite
743 var msignature
= callsite
.msignature
744 var rettype
= msignature
.return_mtype
745 assert msignature
.arity
== 1 and rettype
!= null
747 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
748 if value_type
== null then return null # Skip error
750 v
.check_subtype
(self, rettype
, writetype
)
755 redef class AVarReassignExpr
756 redef fun accept_typing
(v
)
758 var variable
= self.variable
759 assert variable
!= null
761 var readtype
= v
.get_variable
(self, variable
)
762 if readtype
== null then return
766 var writetype
= variable
.declared_type
767 if writetype
== null then return
769 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
771 v
.set_variable
(self, variable
, rettype
)
778 redef class AContinueExpr
779 redef fun accept_typing
(v
)
781 var nexpr
= self.n_expr
782 if nexpr
!= null then
789 redef class ABreakExpr
790 redef fun accept_typing
(v
)
792 var nexpr
= self.n_expr
793 if nexpr
!= null then
800 redef class AReturnExpr
801 redef fun accept_typing
(v
)
803 var nexpr
= self.n_expr
804 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
805 if nexpr
!= null then
806 if ret_type
!= null then
807 v
.visit_expr_subtype
(nexpr
, ret_type
)
810 v
.error
(self, "Error: Return with value in a procedure.")
812 else if ret_type
!= null then
813 v
.error
(self, "Error: Return without value in a function.")
819 redef class AAbortExpr
820 redef fun accept_typing
(v
)
827 redef fun accept_typing
(v
)
829 v
.visit_expr_bool
(n_expr
)
837 redef class AIfexprExpr
838 redef fun accept_typing
(v
)
840 v
.visit_expr_bool
(n_expr
)
842 var t1
= v
.visit_expr
(n_then
)
843 var t2
= v
.visit_expr
(n_else
)
845 if t1
== null or t2
== null then
849 var t
= v
.merge_types
(self, [t1
, t2
])
851 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
858 redef fun accept_typing
(v
)
860 v
.visit_stmt
(n_block
)
865 redef class AWhileExpr
866 redef fun accept_typing
(v
)
868 v
.visit_expr_bool
(n_expr
)
870 v
.visit_stmt
(n_block
)
875 redef class ALoopExpr
876 redef fun accept_typing
(v
)
878 v
.visit_stmt
(n_block
)
884 var coltype
: nullable MClassType
886 var method_iterator
: nullable CallSite
887 var method_is_ok
: nullable CallSite
888 var method_item
: nullable CallSite
889 var method_next
: nullable CallSite
890 var method_key
: nullable CallSite
891 var method_finish
: nullable CallSite
893 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
895 if mtype
isa MNullType then
896 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
901 var objcla
= v
.get_mclass
(self, "Object")
902 if objcla
== null then return
904 # check iterator method
905 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
906 if itdef
== null then
907 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
910 self.method_iterator
= itdef
912 # check that iterator return something
913 var ittype
= itdef
.msignature
.return_mtype
914 if ittype
== null then
915 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
920 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
921 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
925 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
927 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
928 var variables
= self.variables
929 if variables
.length
!= 1 then
930 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
932 variables
.first
.declared_type
= coltype
.arguments
.first
937 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
939 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
940 var variables
= self.variables
941 if variables
.length
!= 2 then
942 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
944 variables
[0].declared_type
= coltype
.arguments
[0]
945 variables
[1].declared_type
= coltype
.arguments
[1]
950 if not is_col
and not is_map
then
951 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
955 # anchor formal and virtual types
956 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
958 mtype
= mtype
.as_notnullable
959 self.coltype
= mtype
.as(MClassType)
961 # get methods is_ok, next, item
962 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
963 if ikdef
== null then
964 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
967 self.method_is_ok
= ikdef
969 var itemdef
= v
.get_method
(self, ittype
, "item", false)
970 if itemdef
== null then
971 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
974 self.method_item
= itemdef
976 var nextdef
= v
.get_method
(self, ittype
, "next", false)
977 if nextdef
== null then
978 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
981 self.method_next
= nextdef
983 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
986 var keydef
= v
.get_method
(self, ittype
, "key", false)
987 if keydef
== null then
988 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
991 self.method_key
= keydef
995 redef fun accept_typing
(v
)
997 var mtype
= v
.visit_expr
(n_expr
)
998 if mtype
== null then return
1000 self.do_type_iterator
(v
, mtype
)
1002 v
.visit_stmt
(n_block
)
1003 self.is_typed
= true
1007 redef class AAssertExpr
1008 redef fun accept_typing
(v
)
1010 v
.visit_expr_bool
(n_expr
)
1012 v
.visit_stmt
(n_else
)
1013 self.is_typed
= true
1018 redef fun accept_typing
(v
)
1020 v
.visit_expr_bool
(n_expr
)
1021 v
.visit_expr_bool
(n_expr2
)
1022 self.mtype
= v
.type_bool
(self)
1026 redef class AImpliesExpr
1027 redef fun accept_typing
(v
)
1029 v
.visit_expr_bool
(n_expr
)
1030 v
.visit_expr_bool
(n_expr2
)
1031 self.mtype
= v
.type_bool
(self)
1035 redef class AAndExpr
1036 redef fun accept_typing
(v
)
1038 v
.visit_expr_bool
(n_expr
)
1039 v
.visit_expr_bool
(n_expr2
)
1040 self.mtype
= v
.type_bool
(self)
1045 redef class ANotExpr
1046 redef fun accept_typing
(v
)
1048 v
.visit_expr_bool
(n_expr
)
1049 self.mtype
= v
.type_bool
(self)
1053 redef class AOrElseExpr
1054 redef fun accept_typing
(v
)
1056 var t1
= v
.visit_expr
(n_expr
)
1057 var t2
= v
.visit_expr
(n_expr2
)
1059 if t1
== null or t2
== null then
1063 t1
= t1
.as_notnullable
1065 var t
= v
.merge_types
(self, [t1
, t2
])
1067 t
= v
.mmodule
.object_type
1068 if t2
isa MNullableType then
1071 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1077 redef class ATrueExpr
1078 redef fun accept_typing
(v
)
1080 self.mtype
= v
.type_bool
(self)
1084 redef class AFalseExpr
1085 redef fun accept_typing
(v
)
1087 self.mtype
= v
.type_bool
(self)
1091 redef class AIntExpr
1092 redef fun accept_typing
(v
)
1094 var mclass
= v
.get_mclass
(self, "Int")
1095 if mclass
== null then return # Forward error
1096 self.mtype
= mclass
.mclass_type
1100 redef class AFloatExpr
1101 redef fun accept_typing
(v
)
1103 var mclass
= v
.get_mclass
(self, "Float")
1104 if mclass
== null then return # Forward error
1105 self.mtype
= mclass
.mclass_type
1109 redef class ACharExpr
1110 redef fun accept_typing
(v
)
1112 var mclass
= v
.get_mclass
(self, "Char")
1113 if mclass
== null then return # Forward error
1114 self.mtype
= mclass
.mclass_type
1118 redef class AStringFormExpr
1119 redef fun accept_typing
(v
)
1121 var mclass
= v
.get_mclass
(self, "String")
1122 if mclass
== null then return # Forward error
1123 self.mtype
= mclass
.mclass_type
1127 redef class ASuperstringExpr
1128 redef fun accept_typing
(v
)
1130 var mclass
= v
.get_mclass
(self, "String")
1131 if mclass
== null then return # Forward error
1132 self.mtype
= mclass
.mclass_type
1133 for nexpr
in self.n_exprs
do
1134 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1139 redef class AArrayExpr
1140 var with_capacity_callsite
: nullable CallSite
1141 var push_callsite
: nullable CallSite
1143 redef fun accept_typing
(v
)
1145 var mtype
: nullable MType = null
1146 var ntype
= self.n_type
1147 if ntype
!= null then
1148 mtype
= v
.resolve_mtype
(ntype
)
1149 if mtype
== null then return # Skip error
1151 var mtypes
= new Array[nullable MType]
1153 for e
in self.n_exprs
.n_exprs
do
1154 var t
= v
.visit_expr
(e
)
1158 if mtype
!= null then
1159 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1160 if t
== mtype
then useless
= true
1165 if mtype
== null then
1166 mtype
= v
.merge_types
(self, mtypes
)
1168 if mtype
== null then
1169 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1173 assert ntype
!= null
1174 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1176 var mclass
= v
.get_mclass
(self, "Array")
1177 if mclass
== null then return # Forward error
1178 var array_mtype
= mclass
.get_mtype
([mtype
])
1180 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1181 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1183 self.mtype
= array_mtype
1187 redef class ARangeExpr
1188 var init_callsite
: nullable CallSite
1190 redef fun accept_typing
(v
)
1192 var discrete_class
= v
.get_mclass
(self, "Discrete")
1193 if discrete_class
== null then return # Forward error
1194 var discrete_type
= discrete_class
.intro
.bound_mtype
1195 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1196 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1197 if t1
== null or t2
== null then return
1198 var mclass
= v
.get_mclass
(self, "Range")
1199 if mclass
== null then return # Forward error
1201 if v
.is_subtype
(t1
, t2
) then
1202 mtype
= mclass
.get_mtype
([t2
])
1203 else if v
.is_subtype
(t2
, t1
) then
1204 mtype
= mclass
.get_mtype
([t1
])
1206 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1212 # get the constructor
1214 if self isa ACrangeExpr then
1215 callsite
= v
.get_method
(self, mtype
, "init", false)
1216 else if self isa AOrangeExpr then
1217 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1221 init_callsite
= callsite
1225 redef class ANullExpr
1226 redef fun accept_typing
(v
)
1228 self.mtype
= v
.mmodule
.model
.null_type
1232 redef class AIsaExpr
1233 # The static type to cast to.
1234 # (different from the static type of the expression that is `Bool`).
1235 var cast_type
: nullable MType
1236 redef fun accept_typing
(v
)
1238 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1239 self.cast_type
= mtype
1241 var variable
= self.n_expr
.its_variable
1242 if variable
!= null then
1243 #var orig = self.n_expr.mtype
1244 #var from = if orig != null then orig.to_s else "invalid"
1245 #var to = if mtype != null then mtype.to_s else "invalid"
1246 #debug("adapt {variable}: {from} -> {to}")
1247 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1250 self.mtype
= v
.type_bool
(self)
1254 redef class AAsCastExpr
1255 redef fun accept_typing
(v
)
1257 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1261 redef class AAsNotnullExpr
1262 redef fun accept_typing
(v
)
1264 var mtype
= v
.visit_expr
(self.n_expr
)
1265 if mtype
== null then return # Forward error
1267 if mtype
isa MNullType then
1268 v
.error
(self, "Type error: as(not null) on null")
1271 if mtype
isa MNullableType then
1272 self.mtype
= mtype
.mtype
1277 if mtype
isa MClassType then
1278 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1281 assert mtype
.need_anchor
1282 var u
= v
.anchor_to
(mtype
)
1283 if not u
isa MNullableType then
1284 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1290 redef class AProxyExpr
1291 redef fun accept_typing
(v
)
1293 self.mtype
= v
.visit_expr
(self.n_expr
)
1297 redef class ASelfExpr
1298 redef var its_variable
: nullable Variable
1299 redef fun accept_typing
(v
)
1301 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1302 v
.error
(self, "Error: self cannot be used in top-level method.")
1304 var variable
= v
.selfvariable
1305 self.its_variable
= variable
1306 self.mtype
= v
.get_variable
(self, variable
)
1310 ## MESSAGE SENDING AND PROPERTY
1312 redef class ASendExpr
1313 # The property invoked by the send.
1314 var callsite
: nullable CallSite
1316 redef fun accept_typing
(v
)
1318 var recvtype
= v
.visit_expr
(self.n_expr
)
1319 var name
= self.property_name
1321 if recvtype
== null then return # Forward error
1322 if recvtype
isa MNullType then
1323 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1327 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1328 if callsite
== null then return
1329 self.callsite
= callsite
1330 var msignature
= callsite
.msignature
1332 var args
= compute_raw_arguments
1334 callsite
.check_signature
(v
, args
)
1336 if callsite
.mproperty
.is_init
then
1337 var vmpropdef
= v
.mpropdef
1338 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1339 v
.error
(self, "Can call a init only in another init")
1341 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1342 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1346 var ret
= msignature
.return_mtype
1350 self.is_typed
= true
1354 # The name of the property
1355 # Each subclass simply provide the correct name.
1356 private fun property_name
: String is abstract
1358 # An array of all arguments (excluding self)
1359 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1361 private fun compute_raw_arguments
: Array[AExpr] is abstract
1364 redef class ABinopExpr
1365 redef fun compute_raw_arguments
do return [n_expr2
]
1368 redef fun property_name
do return "=="
1369 redef fun accept_typing
(v
)
1376 redef fun property_name
do return "!="
1377 redef fun accept_typing
(v
)
1384 redef fun property_name
do return "<"
1387 redef fun property_name
do return "<="
1390 redef fun property_name
do return "<<"
1393 redef fun property_name
do return ">"
1396 redef fun property_name
do return ">="
1399 redef fun property_name
do return ">>"
1401 redef class APlusExpr
1402 redef fun property_name
do return "+"
1404 redef class AMinusExpr
1405 redef fun property_name
do return "-"
1407 redef class AStarshipExpr
1408 redef fun property_name
do return "<=>"
1410 redef class AStarExpr
1411 redef fun property_name
do return "*"
1413 redef class AStarstarExpr
1414 redef fun property_name
do return "**"
1416 redef class ASlashExpr
1417 redef fun property_name
do return "/"
1419 redef class APercentExpr
1420 redef fun property_name
do return "%"
1423 redef class AUminusExpr
1424 redef fun property_name
do return "unary -"
1425 redef fun compute_raw_arguments
do return new Array[AExpr]
1429 redef class ACallExpr
1430 redef fun property_name
do return n_id
.text
1431 redef fun compute_raw_arguments
do return n_args
.to_a
1434 redef class ACallAssignExpr
1435 redef fun property_name
do return n_id
.text
+ "="
1436 redef fun compute_raw_arguments
1438 var res
= n_args
.to_a
1444 redef class ABraExpr
1445 redef fun property_name
do return "[]"
1446 redef fun compute_raw_arguments
do return n_args
.to_a
1449 redef class ABraAssignExpr
1450 redef fun property_name
do return "[]="
1451 redef fun compute_raw_arguments
1453 var res
= n_args
.to_a
1459 redef class ASendReassignFormExpr
1460 # The property invoked for the writing
1461 var write_callsite
: nullable CallSite
1463 redef fun accept_typing
(v
)
1465 var recvtype
= v
.visit_expr
(self.n_expr
)
1466 var name
= self.property_name
1468 if recvtype
== null then return # Forward error
1469 if recvtype
isa MNullType then
1470 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1474 var for_self
= self.n_expr
isa ASelfExpr
1475 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1477 if callsite
== null then return
1478 self.callsite
= callsite
1480 var args
= compute_raw_arguments
1482 callsite
.check_signature
(v
, args
)
1484 var readtype
= callsite
.msignature
.return_mtype
1485 if readtype
== null then
1486 v
.error
(self, "Error: {name} is not a function")
1490 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1491 if wcallsite
== null then return
1492 self.write_callsite
= wcallsite
1494 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1495 if wtype
== null then return
1497 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1498 args
.add
(self.n_value
)
1499 wcallsite
.check_signature
(v
, args
)
1501 self.is_typed
= true
1505 redef class ACallReassignExpr
1506 redef fun property_name
do return n_id
.text
1507 redef fun compute_raw_arguments
do return n_args
.to_a
1510 redef class ABraReassignExpr
1511 redef fun property_name
do return "[]"
1512 redef fun compute_raw_arguments
do return n_args
.to_a
1515 redef class AInitExpr
1516 redef fun property_name
do return "init"
1517 redef fun compute_raw_arguments
do return n_args
.to_a
1521 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1526 redef class ASuperExpr
1527 # The method to call if the super is in fact a 'super init call'
1528 # Note: if the super is a normal call-next-method, then this attribute is null
1529 var callsite
: nullable CallSite
1531 # The method to call is the super is a standard `call-next-method` super-call
1532 # Note: if the super is a special super-init-call, then this attribute is null
1533 var mpropdef
: nullable MMethodDef
1535 redef fun accept_typing
(v
)
1537 var anchor
= v
.anchor
1538 assert anchor
!= null
1539 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1540 assert recvtype
!= null
1541 var mproperty
= v
.mpropdef
.mproperty
1542 if not mproperty
isa MMethod then
1543 v
.error
(self, "Error: super only usable in a method")
1546 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1547 if superprops
.length
== 0 then
1548 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1549 process_superinit
(v
)
1552 v
.error
(self, "Error: No super method to call for {mproperty}.")
1555 # FIXME: covariance of return type in linear extension?
1556 var superprop
= superprops
.first
1558 var msignature
= superprop
.msignature
.as(not null)
1559 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1560 var args
= self.n_args
.to_a
1561 if args
.length
> 0 then
1562 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1564 self.mtype
= msignature
.return_mtype
1565 self.is_typed
= true
1566 v
.mpropdef
.has_supercall
= true
1567 mpropdef
= v
.mpropdef
.as(MMethodDef)
1570 private fun process_superinit
(v
: TypeVisitor)
1572 var anchor
= v
.anchor
1573 assert anchor
!= null
1574 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1575 assert recvtype
!= null
1576 var mpropdef
= v
.mpropdef
1577 assert mpropdef
isa MMethodDef
1578 var mproperty
= mpropdef
.mproperty
1579 var superprop
: nullable MMethodDef = null
1580 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1581 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1582 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1583 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1584 if candidate
== null then
1585 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1586 continue # Try next super-class
1588 if superprop
!= null and candidate
.is_root_init
then
1591 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1592 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1595 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1596 if superprop
!= null and superprop
.mproperty
== candidate
then
1597 if superprop
== candidatedefs
.first
then continue
1598 candidatedefs
.add
(superprop
)
1600 if candidatedefs
.length
> 1 then
1601 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1604 superprop
= candidatedefs
.first
1606 if superprop
== null then
1607 v
.error
(self, "Error: No super method to call for {mproperty}.")
1611 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1612 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1614 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1615 self.callsite
= callsite
1617 var args
= self.n_args
.to_a
1618 if args
.length
> 0 then
1619 callsite
.check_signature
(v
, args
)
1621 # Check there is at least enough parameters
1622 if mpropdef
.msignature
.arity
< msignature
.arity
then
1623 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1626 # Check that each needed parameter is conform
1628 for sp
in msignature
.mparameters
do
1629 var p
= mpropdef
.msignature
.mparameters
[i
]
1630 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1631 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1638 self.is_typed
= true
1644 redef class ANewExpr
1645 # The constructor invoked by the new.
1646 var callsite
: nullable CallSite
1648 redef fun accept_typing
(v
)
1650 var recvtype
= v
.resolve_mtype
(self.n_type
)
1651 if recvtype
== null then return
1652 self.mtype
= recvtype
1654 if not recvtype
isa MClassType then
1655 if recvtype
isa MNullableType then
1656 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1659 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1663 if recvtype
.mclass
.kind
== abstract_kind
then
1664 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1666 else if recvtype
.mclass
.kind
== interface_kind
then
1667 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1679 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1680 if callsite
== null then return
1682 self.callsite
= callsite
1684 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1685 v
.error
(self, "Error: {name} is not a constructor.")
1689 var args
= n_args
.to_a
1690 callsite
.check_signature
(v
, args
)
1696 redef class AAttrFormExpr
1697 # The attribute acceded.
1698 var mproperty
: nullable MAttribute
1700 # The static type of the attribute.
1701 var attr_type
: nullable MType
1703 # Resolve the attribute acceded.
1704 private fun resolve_property
(v
: TypeVisitor)
1706 var recvtype
= v
.visit_expr
(self.n_expr
)
1707 if recvtype
== null then return # Skip error
1708 var name
= self.n_id
.text
1709 if recvtype
isa MNullType then
1710 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1714 var unsafe_type
= v
.anchor_to
(recvtype
)
1715 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1716 if mproperty
== null then
1717 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1720 assert mproperty
isa MAttribute
1721 self.mproperty
= mproperty
1723 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1724 assert mpropdefs
.length
== 1
1725 var mpropdef
= mpropdefs
.first
1726 var attr_type
= mpropdef
.static_mtype
.as(not null)
1727 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1728 self.attr_type
= attr_type
1732 redef class AAttrExpr
1733 redef fun accept_typing
(v
)
1735 self.resolve_property
(v
)
1736 self.mtype
= self.attr_type
1741 redef class AAttrAssignExpr
1742 redef fun accept_typing
(v
)
1744 self.resolve_property
(v
)
1745 var mtype
= self.attr_type
1747 v
.visit_expr_subtype
(self.n_value
, mtype
)
1748 self.is_typed
= true
1752 redef class AAttrReassignExpr
1753 redef fun accept_typing
(v
)
1755 self.resolve_property
(v
)
1756 var mtype
= self.attr_type
1757 if mtype
== null then return # Skip error
1759 self.resolve_reassignment
(v
, mtype
, mtype
)
1761 self.is_typed
= true
1765 redef class AIssetAttrExpr
1766 redef fun accept_typing
(v
)
1768 self.resolve_property
(v
)
1769 var mtype
= self.attr_type
1770 if mtype
== null then return # Skip error
1772 var recvtype
= self.n_expr
.mtype
.as(not null)
1773 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1774 if bound
isa MNullableType then
1775 v
.error
(self, "Error: isset on a nullable attribute.")
1777 self.mtype
= v
.type_bool
(self)
1783 redef class ADebugTypeExpr
1784 redef fun accept_typing
(v
)
1786 var expr
= v
.visit_expr
(self.n_expr
)
1787 if expr
== null then return
1788 var unsafe
= v
.anchor_to
(expr
)
1789 var ntype
= self.n_type
1790 var mtype
= v
.resolve_mtype
(ntype
)
1791 if mtype
!= null and mtype
!= expr
then
1792 var umtype
= v
.anchor_to
(mtype
)
1793 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1795 self.is_typed
= true