1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Intraprocedural resolution of static types and OO-services
18 # By OO-services we mean message sending, attribute access, instantiation, etc.
24 redef class ToolContext
25 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
28 private class TypingPhase
30 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
33 private class TypeVisitor
34 var modelbuilder
: ModelBuilder
36 # The module of the analysis
37 # Used to correctly query the model
40 # The static type of the receiver
41 # Mainly used for type tests and type resolutions
42 var anchor
: nullable MClassType = null
44 # The analyzed mclassdef
45 var mclassdef
: nullable MClassDef = null
47 # The analyzed property
48 var mpropdef
: nullable MPropDef
50 var selfvariable
= new Variable("self")
52 # Is `self` use restricted?
53 # * no explicit `self`
54 # * method called on the implicit self must be top-level
55 var is_toplevel_context
= false
59 var mpropdef
= self.mpropdef
61 if mpropdef
!= null then
62 self.mpropdef
= mpropdef
63 var mclassdef
= mpropdef
.mclassdef
64 self.mclassdef
= mclassdef
65 self.anchor
= mclassdef
.bound_mtype
67 var mclass
= mclassdef
.mclass
69 var selfvariable
= new Variable("self")
70 self.selfvariable
= selfvariable
71 selfvariable
.declared_type
= mclass
.mclass_type
73 var mprop
= mpropdef
.mproperty
74 if mprop
isa MMethod and (mprop
.is_toplevel
or mprop
.is_new
) then
75 is_toplevel_context
= true
80 fun anchor_to
(mtype
: MType): MType
83 if anchor
== null then
84 assert not mtype
.need_anchor
87 return mtype
.anchor_to
(mmodule
, anchor
)
90 fun is_subtype
(sub
, sup
: MType): Bool
92 return sub
.is_subtype
(mmodule
, anchor
, sup
)
95 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
97 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
98 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
102 # Check that `sub` is a subtype of `sup`.
103 # If `sub` is not a valid suptype, then display an error on `node` an return null.
104 # If `sub` is a safe subtype of `sup` then return `sub`.
105 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
107 # The point of the return type is to determinate the usable type on an expression:
108 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
109 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
110 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
112 if self.is_subtype
(sub
, sup
) then return sub
113 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
114 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
115 #node.debug("Unsafe typing: expected {sup}, got {sub}")
118 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
122 # Visit an expression and do not care about the return value
123 fun visit_stmt
(nexpr
: nullable AExpr)
125 if nexpr
== null then return
126 nexpr
.accept_typing
(self)
129 # Visit an expression and expects that it is not a statement
130 # Return the type of the expression
131 # Display an error and return null if:
132 # * the type cannot be determined or
133 # * `nexpr` is a statement
134 fun visit_expr
(nexpr
: AExpr): nullable MType
136 nexpr
.accept_typing
(self)
137 var mtype
= nexpr
.mtype
138 if mtype
!= null then return mtype
139 if not nexpr
.is_typed
then
140 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
141 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
142 nexpr
.debug
("No return type but no error.")
145 return null # forward error
147 self.error
(nexpr
, "Type error: expected expression.")
151 # Visit an expression and expect its static type is a least a `sup`
152 # Return the type of the expression or null if
153 # * the type cannot be determined or
154 # * `nexpr` is a statement or
155 # * `nexpr` is not a `sup`
156 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
158 var sub
= visit_expr
(nexpr
)
159 if sub
== null then return null # Forward error
161 if sup
== null then return null # Forward error
163 var res
= check_subtype
(nexpr
, sub
, sup
)
165 nexpr
.implicit_cast_to
= res
170 # Visit an expression and expect its static type is a `Bool`
171 # Return the type of the expression or null if
172 # * the type cannot be determined or
173 # * `nexpr` is a statement or
174 # * `nexpr` is not a `Bool`
175 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
177 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
181 fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
183 var sub
= visit_expr
(nexpr
)
184 if sub
== null then return null # Forward error
186 var sup
= self.resolve_mtype
(ntype
)
187 if sup
== null then return null # Forward error
190 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup}.")
191 else if self.is_subtype
(sub
, sup
) then
192 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup} since it is a {sub}.")
197 # Special verification on != and == for null
199 fun null_test
(anode
: ABinopExpr)
201 var mtype
= anode
.n_expr
.mtype
202 var mtype2
= anode
.n_expr2
.mtype
204 if mtype
== null or mtype2
== null then return
206 if not mtype2
isa MNullType then return
208 # Check of useless null
209 if not mtype
isa MNullableType then
210 if not anchor_to
(mtype
) isa MNullableType then
211 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
216 # Check for type adaptation
217 var variable
= anode
.n_expr
.its_variable
218 if variable
== null then return
220 if anode
isa AEqExpr then
221 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
222 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
.mtype
)
223 else if anode
isa ANeExpr then
224 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
225 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
.mtype
)
231 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
233 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
236 fun resolve_mtype
(node
: AType): nullable MType
238 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
241 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
243 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
247 fun get_mclass
(node
: ANode, name
: String): nullable MClass
249 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
250 if mclass
== null then
251 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
256 fun type_bool
(node
: ANode): nullable MType
258 var mclass
= self.get_mclass
(node
, "Bool")
259 if mclass
== null then return null
260 return mclass
.mclass_type
263 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
265 var unsafe_type
= self.anchor_to
(recvtype
)
267 #debug("recv: {recvtype} (aka {unsafe_type})")
268 if recvtype
isa MNullType then
269 # `null` only accepts some methods of object.
270 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
271 unsafe_type
= mmodule
.object_type
.as_nullable
273 self.error
(node
, "Error: Method '{name}' call on 'null'.")
278 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
279 if name
== "new" and mproperty
== null then
281 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
284 if mproperty
== null then
285 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
287 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
289 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
294 assert mproperty
isa MMethod
296 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
297 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
299 if not recv_is_self
and mproperty
.is_toplevel
then
300 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
303 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
304 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
308 var info
= mproperty
.deprecation
309 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
312 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
314 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
318 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
320 if propdefs
.length
== 0 then
321 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
323 else if propdefs
.length
== 1 then
324 mpropdef
= propdefs
.first
326 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
327 mpropdef
= mproperty
.intro
331 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
332 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
334 var erasure_cast
= false
335 var rettype
= mpropdef
.msignature
.return_mtype
336 if not recv_is_self
and rettype
!= null then
337 rettype
= rettype
.as_notnullable
338 if rettype
isa MParameterType then
339 var erased_rettype
= msignature
.return_mtype
340 assert erased_rettype
!= null
341 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
346 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
350 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
352 var unsafe_type
= self.anchor_to
(recvtype
)
353 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
354 if mproperty
== null then return null
355 return get_method
(node
, recvtype
, name
, recv_is_self
)
359 # Visit the expressions of args and check their conformity with the corresponding type in signature
360 # The point of this method is to handle varargs correctly
361 # Note: The signature must be correctly adapted
362 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
364 var vararg_rank
= msignature
.vararg_rank
365 if vararg_rank
>= 0 then
366 if args
.length
< msignature
.arity
then
367 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
368 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
371 else if args
.length
!= msignature
.arity
then
372 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
376 #debug("CALL {unsafe_type}.{msignature}")
378 var vararg_decl
= args
.length
- msignature
.arity
379 for i
in [0..msignature
.arity
[ do
381 if i
== vararg_rank
then continue # skip the vararg
382 if i
> vararg_rank
then
385 var paramtype
= msignature
.mparameters
[i
].mtype
386 self.visit_expr_subtype
(args
[j
], paramtype
)
388 if vararg_rank
>= 0 then
389 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
390 var first
= args
[vararg_rank
]
391 if vararg_decl
== 0 and first
isa AVarargExpr then
392 var mclass
= get_mclass
(node
, "Array")
393 if mclass
== null then return false # Forward error
394 var array_mtype
= mclass
.get_mtype
([paramtype
])
395 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
396 first
.mtype
= first
.n_expr
.mtype
398 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
399 self.visit_expr_subtype
(args
[j
], paramtype
)
406 fun error
(node
: ANode, message
: String)
408 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
411 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
413 var flow
= node
.after_flow_context
415 self.error
(node
, "No context!")
419 if flow
.vars
.has_key
(variable
) then
420 return flow
.vars
[variable
]
422 #node.debug("*** START Collected for {variable}")
423 var mtypes
= flow
.collect_types
(variable
)
424 #node.debug("**** END Collected for {variable}")
425 if mtypes
== null or mtypes
.length
== 0 then
426 return variable
.declared_type
427 else if mtypes
.length
== 1 then
430 var res
= merge_types
(node
,mtypes
)
431 if res
== null then res
= variable
.declared_type
437 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
439 var flow
= node
.after_flow_context
442 flow
.set_var
(variable
, mtype
)
445 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
447 if col
.length
== 1 then return col
.first
449 if t1
== null then continue # return null
452 if t2
== null then continue # return null
453 if t2
isa MNullableType or t2
isa MNullType then
456 if not is_subtype
(t2
, t1
) then found
= false
459 #print "merge {col.join(" ")} -> {t1}"
463 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
468 # A specific method call site with its associated informations.
470 # The associated node for location
473 # The static type of the receiver (possibly unresolved)
476 # The module where the callsite is present
479 # The anchor to use with `recv` or `msignature`
480 var anchor
: nullable MClassType
482 # Is the receiver self?
483 # If "for_self", virtual types of the signature are kept
484 # If "not_for_self", virtual type are erased
485 var recv_is_self
: Bool
487 # The designated method
488 var mproperty
: MMethod
490 # The statically designated method definition
491 # The most specif one, it is.
492 var mpropdef
: MMethodDef
494 # The resolved signature for the receiver
495 var msignature
: MSignature
497 # Is a implicit cast required on erasure typing policy?
498 var erasure_cast
: Bool
500 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
502 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
507 # The declared type of the variable
508 var declared_type
: nullable MType
511 redef class FlowContext
512 # Store changes of types because of type evolution
513 private var vars
= new HashMap[Variable, nullable MType]
514 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
516 # Adapt the variable to a static type
517 # Warning1: do not modify vars directly.
518 # Warning2: sub-flow may have cached a unadapted variable
519 private fun set_var
(variable
: Variable, mtype
: nullable MType)
521 self.vars
[variable
] = mtype
522 self.cache
.keys
.remove
(variable
)
525 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
527 if cache
.has_key
(variable
) then
528 return cache
[variable
]
530 var res
: nullable Array[nullable MType] = null
531 if vars
.has_key
(variable
) then
532 var mtype
= vars
[variable
]
534 else if self.previous
.is_empty
then
536 res
= [variable
.declared_type
]
538 for flow
in self.previous
do
539 if flow
.is_unreachable
then continue
540 var r2
= flow
.collect_types
(variable
)
541 if r2
== null then continue
546 if not res
.has
(t
) then res
.add
(t
)
551 cache
[variable
] = res
557 # The entry point of the whole typing analysis
558 fun do_typing
(modelbuilder
: ModelBuilder)
562 # The variable associated to the receiver (if any)
563 var selfvariable
: nullable Variable
566 redef class AMethPropdef
567 redef fun do_typing
(modelbuilder
: ModelBuilder)
569 var nblock
= self.n_block
570 if nblock
== null then return
572 var mpropdef
= self.mpropdef
.as(not null)
573 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
574 self.selfvariable
= v
.selfvariable
576 var mmethoddef
= self.mpropdef
.as(not null)
577 for i
in [0..mmethoddef
.msignature
.arity
[ do
578 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
579 if mmethoddef
.msignature
.vararg_rank
== i
then
580 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
581 if arrayclass
== null then return # Skip error
582 mtype
= arrayclass
.get_mtype
([mtype
])
584 var variable
= self.n_signature
.n_params
[i
].variable
585 assert variable
!= null
586 variable
.declared_type
= mtype
590 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
591 # We reach the end of the function without having a return, it is bad
592 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
597 redef class AAttrPropdef
598 redef fun do_typing
(modelbuilder
: ModelBuilder)
600 var mpropdef
= self.mpropdef
.as(not null)
601 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
602 self.selfvariable
= v
.selfvariable
604 var nexpr
= self.n_expr
605 if nexpr
!= null then
606 var mtype
= self.mpropdef
.static_mtype
607 v
.visit_expr_subtype
(nexpr
, mtype
)
609 var nblock
= self.n_block
610 if nblock
!= null then
612 if not nblock
.after_flow_context
.is_unreachable
then
613 # We reach the end of the init without having a return, it is bad
614 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
623 # The static type of the expression.
624 # null if self is a statement or in case of error
625 var mtype
: nullable MType = null
627 # Is the statement correctly typed?
628 # Used to distinguish errors and statements when `mtype == null`
629 var is_typed
: Bool = false
631 # If required, the following implicit cast `.as(XXX)`
632 # Such a cast may by required after evaluating the expression when
633 # a unsafe operation is detected (silently accepted by the Nit language).
634 # The attribute is computed by `check_subtype`
635 var implicit_cast_to
: nullable MType = null
637 # Return the variable read (if any)
638 # Used to perform adaptive typing
639 fun its_variable
: nullable Variable do return null
641 private fun accept_typing
(v
: TypeVisitor)
643 v
.error
(self, "no implemented accept_typing for {self.class_name}")
646 # Is non-null if `self` is a leaf of a comprehension array construction.
647 # In this case, the enclosing literal array node is designated.
648 # The result of the evaluation of `self` must be
649 # stored inside the designated array (there is an implicit `push`)
650 var comprehension
: nullable AArrayExpr = null
653 redef class ABlockExpr
654 redef fun accept_typing
(v
)
656 for e
in self.n_expr
do v
.visit_stmt
(e
)
660 # The type of a blockexpr is the one of the last expression (or null if empty)
663 if self.n_expr
.is_empty
then return null
664 return self.n_expr
.last
.mtype
668 redef class AVardeclExpr
669 redef fun accept_typing
(v
)
671 var variable
= self.variable
672 if variable
== null then return # Skip error
674 var ntype
= self.n_type
675 var mtype
: nullable MType
676 if ntype
== null then
679 mtype
= v
.resolve_mtype
(ntype
)
680 if mtype
== null then return # Skip error
683 var nexpr
= self.n_expr
684 if nexpr
!= null then
685 if mtype
!= null then
686 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
687 if etype
== mtype
then
689 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
692 mtype
= v
.visit_expr
(nexpr
)
693 if mtype
== null then return # Skip error
698 if mtype
== null or mtype
isa MNullType then
699 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
700 if mtype
== null then mtype
= decltype
703 variable
.declared_type
= decltype
704 v
.set_variable
(self, variable
, mtype
)
706 #debug("var {variable}: {mtype}")
713 redef fun its_variable
do return self.variable
714 redef fun accept_typing
(v
)
716 var variable
= self.variable
717 if variable
== null then return # Skip error
719 var mtype
= v
.get_variable
(self, variable
)
720 if mtype
!= null then
721 #debug("{variable} is {mtype}")
723 #debug("{variable} is untyped")
730 redef class AVarAssignExpr
731 redef fun accept_typing
(v
)
733 var variable
= self.variable
734 assert variable
!= null
736 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
738 v
.set_variable
(self, variable
, mtype
)
744 redef class AReassignFormExpr
745 # The method designed by the reassign operator.
746 var reassign_callsite
: nullable CallSite
748 var read_type
: nullable MType = null
750 # Determine the `reassign_property`
751 # `readtype` is the type of the reading of the left value.
752 # `writetype` is the type of the writing of the left value.
753 # (Because of `ACallReassignExpr`, both can be different.
754 # Return the static type of the value to store.
755 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
757 var reassign_name
: String
758 if self.n_assign_op
isa APlusAssignOp then
760 else if self.n_assign_op
isa AMinusAssignOp then
766 self.read_type
= readtype
768 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
769 if callsite
== null then return null # Skip error
770 self.reassign_callsite
= callsite
772 var msignature
= callsite
.msignature
773 var rettype
= msignature
.return_mtype
774 assert msignature
.arity
== 1 and rettype
!= null
776 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
777 if value_type
== null then return null # Skip error
779 v
.check_subtype
(self, rettype
, writetype
)
784 redef class AVarReassignExpr
785 redef fun accept_typing
(v
)
787 var variable
= self.variable
788 assert variable
!= null
790 var readtype
= v
.get_variable
(self, variable
)
791 if readtype
== null then return
795 var writetype
= variable
.declared_type
796 if writetype
== null then return
798 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
800 v
.set_variable
(self, variable
, rettype
)
807 redef class AContinueExpr
808 redef fun accept_typing
(v
)
810 var nexpr
= self.n_expr
811 if nexpr
!= null then
818 redef class ABreakExpr
819 redef fun accept_typing
(v
)
821 var nexpr
= self.n_expr
822 if nexpr
!= null then
829 redef class AReturnExpr
830 redef fun accept_typing
(v
)
832 var nexpr
= self.n_expr
834 var mpropdef
= v
.mpropdef
835 if mpropdef
isa MMethodDef then
836 ret_type
= mpropdef
.msignature
.return_mtype
837 else if mpropdef
isa MAttributeDef then
838 ret_type
= mpropdef
.static_mtype
842 if nexpr
!= null then
843 if ret_type
!= null then
844 v
.visit_expr_subtype
(nexpr
, ret_type
)
847 v
.error
(self, "Error: Return with value in a procedure.")
849 else if ret_type
!= null then
850 v
.error
(self, "Error: Return without value in a function.")
856 redef class AAbortExpr
857 redef fun accept_typing
(v
)
864 redef fun accept_typing
(v
)
866 v
.visit_expr_bool
(n_expr
)
873 if n_then
!= null and n_else
== null then
874 self.mtype
= n_then
.mtype
879 redef class AIfexprExpr
880 redef fun accept_typing
(v
)
882 v
.visit_expr_bool
(n_expr
)
884 var t1
= v
.visit_expr
(n_then
)
885 var t2
= v
.visit_expr
(n_else
)
887 if t1
== null or t2
== null then
891 var t
= v
.merge_types
(self, [t1
, t2
])
893 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
900 redef fun accept_typing
(v
)
902 v
.visit_stmt
(n_block
)
907 redef class AWhileExpr
908 redef fun accept_typing
(v
)
910 v
.visit_expr_bool
(n_expr
)
912 v
.visit_stmt
(n_block
)
917 redef class ALoopExpr
918 redef fun accept_typing
(v
)
920 v
.visit_stmt
(n_block
)
926 var coltype
: nullable MClassType
928 var method_iterator
: nullable CallSite
929 var method_is_ok
: nullable CallSite
930 var method_item
: nullable CallSite
931 var method_next
: nullable CallSite
932 var method_key
: nullable CallSite
933 var method_finish
: nullable CallSite
935 var method_lt
: nullable CallSite
936 var method_successor
: nullable CallSite
938 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
940 if mtype
isa MNullType then
941 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
946 var objcla
= v
.get_mclass
(self, "Object")
947 if objcla
== null then return
949 # check iterator method
950 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
951 if itdef
== null then
952 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
955 self.method_iterator
= itdef
957 # check that iterator return something
958 var ittype
= itdef
.msignature
.return_mtype
959 if ittype
== null then
960 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
965 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
966 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
970 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
972 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
973 var variables
= self.variables
974 if variables
.length
!= 1 then
975 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
977 variables
.first
.declared_type
= coltype
.arguments
.first
982 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
984 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
985 var variables
= self.variables
986 if variables
.length
!= 2 then
987 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
989 variables
[0].declared_type
= coltype
.arguments
[0]
990 variables
[1].declared_type
= coltype
.arguments
[1]
995 if not is_col
and not is_map
then
996 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1000 # anchor formal and virtual types
1001 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1003 mtype
= mtype
.as_notnullable
1004 self.coltype
= mtype
.as(MClassType)
1006 # get methods is_ok, next, item
1007 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1008 if ikdef
== null then
1009 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1012 self.method_is_ok
= ikdef
1014 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1015 if itemdef
== null then
1016 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1019 self.method_item
= itemdef
1021 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1022 if nextdef
== null then
1023 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1026 self.method_next
= nextdef
1028 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1031 var keydef
= v
.get_method
(self, ittype
, "key", false)
1032 if keydef
== null then
1033 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1036 self.method_key
= keydef
1039 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1040 var variable
= variables
.first
1041 var vtype
= variable
.declared_type
.as(not null)
1043 if n_expr
isa AOrangeExpr then
1044 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1046 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1049 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1053 redef fun accept_typing
(v
)
1055 var mtype
= v
.visit_expr
(n_expr
)
1056 if mtype
== null then return
1058 self.do_type_iterator
(v
, mtype
)
1060 v
.visit_stmt
(n_block
)
1061 self.mtype
= n_block
.mtype
1062 self.is_typed
= true
1066 redef class AAssertExpr
1067 redef fun accept_typing
(v
)
1069 v
.visit_expr_bool
(n_expr
)
1071 v
.visit_stmt
(n_else
)
1072 self.is_typed
= true
1077 redef fun accept_typing
(v
)
1079 v
.visit_expr_bool
(n_expr
)
1080 v
.visit_expr_bool
(n_expr2
)
1081 self.mtype
= v
.type_bool
(self)
1085 redef class AImpliesExpr
1086 redef fun accept_typing
(v
)
1088 v
.visit_expr_bool
(n_expr
)
1089 v
.visit_expr_bool
(n_expr2
)
1090 self.mtype
= v
.type_bool
(self)
1094 redef class AAndExpr
1095 redef fun accept_typing
(v
)
1097 v
.visit_expr_bool
(n_expr
)
1098 v
.visit_expr_bool
(n_expr2
)
1099 self.mtype
= v
.type_bool
(self)
1104 redef class ANotExpr
1105 redef fun accept_typing
(v
)
1107 v
.visit_expr_bool
(n_expr
)
1108 self.mtype
= v
.type_bool
(self)
1112 redef class AOrElseExpr
1113 redef fun accept_typing
(v
)
1115 var t1
= v
.visit_expr
(n_expr
)
1116 var t2
= v
.visit_expr
(n_expr2
)
1118 if t1
== null or t2
== null then
1122 t1
= t1
.as_notnullable
1124 var t
= v
.merge_types
(self, [t1
, t2
])
1126 t
= v
.mmodule
.object_type
1127 if t2
isa MNullableType then
1130 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1136 redef class ATrueExpr
1137 redef fun accept_typing
(v
)
1139 self.mtype
= v
.type_bool
(self)
1143 redef class AFalseExpr
1144 redef fun accept_typing
(v
)
1146 self.mtype
= v
.type_bool
(self)
1150 redef class AIntExpr
1151 redef fun accept_typing
(v
)
1153 var mclass
= v
.get_mclass
(self, "Int")
1154 if mclass
== null then return # Forward error
1155 self.mtype
= mclass
.mclass_type
1159 redef class AFloatExpr
1160 redef fun accept_typing
(v
)
1162 var mclass
= v
.get_mclass
(self, "Float")
1163 if mclass
== null then return # Forward error
1164 self.mtype
= mclass
.mclass_type
1168 redef class ACharExpr
1169 redef fun accept_typing
(v
)
1171 var mclass
= v
.get_mclass
(self, "Char")
1172 if mclass
== null then return # Forward error
1173 self.mtype
= mclass
.mclass_type
1177 redef class AStringFormExpr
1178 redef fun accept_typing
(v
)
1180 var mclass
= v
.get_mclass
(self, "String")
1181 if mclass
== null then return # Forward error
1182 self.mtype
= mclass
.mclass_type
1186 redef class ASuperstringExpr
1187 redef fun accept_typing
(v
)
1189 var mclass
= v
.get_mclass
(self, "String")
1190 if mclass
== null then return # Forward error
1191 self.mtype
= mclass
.mclass_type
1192 for nexpr
in self.n_exprs
do
1193 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1198 redef class AArrayExpr
1199 # The `with_capacity` method on Array
1200 var with_capacity_callsite
: nullable CallSite
1202 # The `push` method on arrays
1203 var push_callsite
: nullable CallSite
1205 # The element of each type
1206 var element_mtype
: nullable MType
1208 # Set that `self` is a part of comprehension array `na`
1209 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1210 private fun set_comprehension
(n
: nullable AExpr)
1214 else if n
isa AForExpr then
1215 set_comprehension
(n
.n_block
)
1216 else if n
isa AIfExpr then
1217 set_comprehension
(n
.n_then
)
1218 set_comprehension
(n
.n_else
)
1221 n
.comprehension
= self
1224 redef fun accept_typing
(v
)
1226 var mtype
: nullable MType = null
1227 var ntype
= self.n_type
1228 if ntype
!= null then
1229 mtype
= v
.resolve_mtype
(ntype
)
1230 if mtype
== null then return # Skip error
1232 var mtypes
= new Array[nullable MType]
1234 for e
in self.n_exprs
do
1235 var t
= v
.visit_expr
(e
)
1239 set_comprehension
(e
)
1240 if mtype
!= null then
1241 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1242 if t
== mtype
then useless
= true
1247 if mtype
== null then
1248 mtype
= v
.merge_types
(self, mtypes
)
1250 if mtype
== null or mtype
isa MNullType then
1251 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1255 assert ntype
!= null
1256 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1259 self.element_mtype
= mtype
1261 var mclass
= v
.get_mclass
(self, "Array")
1262 if mclass
== null then return # Forward error
1263 var array_mtype
= mclass
.get_mtype
([mtype
])
1265 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1266 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1268 self.mtype
= array_mtype
1272 redef class ARangeExpr
1273 var init_callsite
: nullable CallSite
1275 redef fun accept_typing
(v
)
1277 var discrete_class
= v
.get_mclass
(self, "Discrete")
1278 if discrete_class
== null then return # Forward error
1279 var discrete_type
= discrete_class
.intro
.bound_mtype
1280 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1281 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1282 if t1
== null or t2
== null then return
1283 var mclass
= v
.get_mclass
(self, "Range")
1284 if mclass
== null then return # Forward error
1286 if v
.is_subtype
(t1
, t2
) then
1287 mtype
= mclass
.get_mtype
([t2
])
1288 else if v
.is_subtype
(t2
, t1
) then
1289 mtype
= mclass
.get_mtype
([t1
])
1291 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1297 # get the constructor
1299 if self isa ACrangeExpr then
1300 callsite
= v
.get_method
(self, mtype
, "init", false)
1301 else if self isa AOrangeExpr then
1302 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1306 init_callsite
= callsite
1310 redef class ANullExpr
1311 redef fun accept_typing
(v
)
1313 self.mtype
= v
.mmodule
.model
.null_type
1317 redef class AIsaExpr
1318 # The static type to cast to.
1319 # (different from the static type of the expression that is `Bool`).
1320 var cast_type
: nullable MType
1321 redef fun accept_typing
(v
)
1323 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1324 self.cast_type
= mtype
1326 var variable
= self.n_expr
.its_variable
1327 if variable
!= null then
1328 #var orig = self.n_expr.mtype
1329 #var from = if orig != null then orig.to_s else "invalid"
1330 #var to = if mtype != null then mtype.to_s else "invalid"
1331 #debug("adapt {variable}: {from} -> {to}")
1332 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1335 self.mtype
= v
.type_bool
(self)
1339 redef class AAsCastExpr
1340 redef fun accept_typing
(v
)
1342 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1346 redef class AAsNotnullExpr
1347 redef fun accept_typing
(v
)
1349 var mtype
= v
.visit_expr
(self.n_expr
)
1350 if mtype
== null then return # Forward error
1352 if mtype
isa MNullType then
1353 v
.error
(self, "Type error: as(not null) on null")
1356 if mtype
isa MNullableType then
1357 self.mtype
= mtype
.mtype
1362 if mtype
isa MClassType then
1363 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1366 assert mtype
.need_anchor
1367 var u
= v
.anchor_to
(mtype
)
1368 if not u
isa MNullableType then
1369 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1375 redef class AParExpr
1376 redef fun accept_typing
(v
)
1378 self.mtype
= v
.visit_expr
(self.n_expr
)
1382 redef class AOnceExpr
1383 redef fun accept_typing
(v
)
1385 self.mtype
= v
.visit_expr
(self.n_expr
)
1389 redef class ASelfExpr
1390 redef var its_variable
: nullable Variable
1391 redef fun accept_typing
(v
)
1393 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1394 v
.error
(self, "Error: self cannot be used in top-level method.")
1396 var variable
= v
.selfvariable
1397 self.its_variable
= variable
1398 self.mtype
= v
.get_variable
(self, variable
)
1402 ## MESSAGE SENDING AND PROPERTY
1404 redef class ASendExpr
1405 # The property invoked by the send.
1406 var callsite
: nullable CallSite
1408 redef fun accept_typing
(v
)
1410 var recvtype
= v
.visit_expr
(self.n_expr
)
1411 var name
= self.property_name
1413 if recvtype
== null then return # Forward error
1415 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1416 if callsite
== null then return
1417 self.callsite
= callsite
1418 var msignature
= callsite
.msignature
1420 var args
= compute_raw_arguments
1422 callsite
.check_signature
(v
, args
)
1424 if callsite
.mproperty
.is_init
then
1425 var vmpropdef
= v
.mpropdef
1426 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1427 v
.error
(self, "Can call a init only in another init")
1429 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1430 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1434 var ret
= msignature
.return_mtype
1438 self.is_typed
= true
1442 # The name of the property
1443 # Each subclass simply provide the correct name.
1444 private fun property_name
: String is abstract
1446 # An array of all arguments (excluding self)
1447 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1449 private fun compute_raw_arguments
: Array[AExpr] is abstract
1452 redef class ABinopExpr
1453 redef fun compute_raw_arguments
do return [n_expr2
]
1456 redef fun property_name
do return "=="
1457 redef fun accept_typing
(v
)
1464 redef fun property_name
do return "!="
1465 redef fun accept_typing
(v
)
1472 redef fun property_name
do return "<"
1475 redef fun property_name
do return "<="
1478 redef fun property_name
do return "<<"
1481 redef fun property_name
do return ">"
1484 redef fun property_name
do return ">="
1487 redef fun property_name
do return ">>"
1489 redef class APlusExpr
1490 redef fun property_name
do return "+"
1492 redef class AMinusExpr
1493 redef fun property_name
do return "-"
1495 redef class AStarshipExpr
1496 redef fun property_name
do return "<=>"
1498 redef class AStarExpr
1499 redef fun property_name
do return "*"
1501 redef class AStarstarExpr
1502 redef fun property_name
do return "**"
1504 redef class ASlashExpr
1505 redef fun property_name
do return "/"
1507 redef class APercentExpr
1508 redef fun property_name
do return "%"
1511 redef class AUminusExpr
1512 redef fun property_name
do return "unary -"
1513 redef fun compute_raw_arguments
do return new Array[AExpr]
1517 redef class ACallExpr
1518 redef fun property_name
do return n_id
.text
1519 redef fun compute_raw_arguments
do return n_args
.to_a
1522 redef class ACallAssignExpr
1523 redef fun property_name
do return n_id
.text
+ "="
1524 redef fun compute_raw_arguments
1526 var res
= n_args
.to_a
1532 redef class ABraExpr
1533 redef fun property_name
do return "[]"
1534 redef fun compute_raw_arguments
do return n_args
.to_a
1537 redef class ABraAssignExpr
1538 redef fun property_name
do return "[]="
1539 redef fun compute_raw_arguments
1541 var res
= n_args
.to_a
1547 redef class ASendReassignFormExpr
1548 # The property invoked for the writing
1549 var write_callsite
: nullable CallSite
1551 redef fun accept_typing
(v
)
1553 var recvtype
= v
.visit_expr
(self.n_expr
)
1554 var name
= self.property_name
1556 if recvtype
== null then return # Forward error
1558 var for_self
= self.n_expr
isa ASelfExpr
1559 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1561 if callsite
== null then return
1562 self.callsite
= callsite
1564 var args
= compute_raw_arguments
1566 callsite
.check_signature
(v
, args
)
1568 var readtype
= callsite
.msignature
.return_mtype
1569 if readtype
== null then
1570 v
.error
(self, "Error: {name} is not a function")
1574 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1575 if wcallsite
== null then return
1576 self.write_callsite
= wcallsite
1578 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1579 if wtype
== null then return
1581 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1582 args
.add
(self.n_value
)
1583 wcallsite
.check_signature
(v
, args
)
1585 self.is_typed
= true
1589 redef class ACallReassignExpr
1590 redef fun property_name
do return n_id
.text
1591 redef fun compute_raw_arguments
do return n_args
.to_a
1594 redef class ABraReassignExpr
1595 redef fun property_name
do return "[]"
1596 redef fun compute_raw_arguments
do return n_args
.to_a
1599 redef class AInitExpr
1600 redef fun property_name
do return "init"
1601 redef fun compute_raw_arguments
do return n_args
.to_a
1605 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1610 redef class ASuperExpr
1611 # The method to call if the super is in fact a 'super init call'
1612 # Note: if the super is a normal call-next-method, then this attribute is null
1613 var callsite
: nullable CallSite
1615 # The method to call is the super is a standard `call-next-method` super-call
1616 # Note: if the super is a special super-init-call, then this attribute is null
1617 var mpropdef
: nullable MMethodDef
1619 redef fun accept_typing
(v
)
1621 var anchor
= v
.anchor
1622 assert anchor
!= null
1623 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1624 assert recvtype
!= null
1625 var mproperty
= v
.mpropdef
.mproperty
1626 if not mproperty
isa MMethod then
1627 v
.error
(self, "Error: super only usable in a method")
1630 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1631 if superprops
.length
== 0 then
1632 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1633 process_superinit
(v
)
1636 v
.error
(self, "Error: No super method to call for {mproperty}.")
1639 # FIXME: covariance of return type in linear extension?
1640 var superprop
= superprops
.first
1642 var msignature
= superprop
.msignature
.as(not null)
1643 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1644 var args
= self.n_args
.to_a
1645 if args
.length
> 0 then
1646 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1648 self.mtype
= msignature
.return_mtype
1649 self.is_typed
= true
1650 v
.mpropdef
.has_supercall
= true
1651 mpropdef
= v
.mpropdef
.as(MMethodDef)
1654 private fun process_superinit
(v
: TypeVisitor)
1656 var anchor
= v
.anchor
1657 assert anchor
!= null
1658 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1659 assert recvtype
!= null
1660 var mpropdef
= v
.mpropdef
1661 assert mpropdef
isa MMethodDef
1662 var mproperty
= mpropdef
.mproperty
1663 var superprop
: nullable MMethodDef = null
1664 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1665 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1666 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1667 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1668 if candidate
== null then
1669 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1670 continue # Try next super-class
1672 if superprop
!= null and candidate
.is_root_init
then
1675 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1676 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1679 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1680 if superprop
!= null and superprop
.mproperty
== candidate
then
1681 if superprop
== candidatedefs
.first
then continue
1682 candidatedefs
.add
(superprop
)
1684 if candidatedefs
.length
> 1 then
1685 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1688 superprop
= candidatedefs
.first
1690 if superprop
== null then
1691 v
.error
(self, "Error: No super method to call for {mproperty}.")
1695 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1696 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1698 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1699 self.callsite
= callsite
1701 var args
= self.n_args
.to_a
1702 if args
.length
> 0 then
1703 callsite
.check_signature
(v
, args
)
1705 # Check there is at least enough parameters
1706 if mpropdef
.msignature
.arity
< msignature
.arity
then
1707 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1710 # Check that each needed parameter is conform
1712 for sp
in msignature
.mparameters
do
1713 var p
= mpropdef
.msignature
.mparameters
[i
]
1714 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1715 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1722 self.is_typed
= true
1728 redef class ANewExpr
1729 # The constructor invoked by the new.
1730 var callsite
: nullable CallSite
1732 # The designated type
1733 var recvtype
: nullable MClassType
1735 redef fun accept_typing
(v
)
1737 var recvtype
= v
.resolve_mtype
(self.n_type
)
1738 if recvtype
== null then return
1740 if not recvtype
isa MClassType then
1741 if recvtype
isa MNullableType then
1742 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1745 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1750 self.recvtype
= recvtype
1759 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1760 if callsite
== null then return
1762 if not callsite
.mproperty
.is_new
then
1763 var kind
= recvtype
.mclass
.kind
1764 if kind
!= concrete_kind
then
1765 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1768 self.mtype
= recvtype
1770 self.mtype
= callsite
.msignature
.return_mtype
1771 assert self.mtype
!= null
1774 self.callsite
= callsite
1776 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1777 v
.error
(self, "Error: {name} is not a constructor.")
1781 var args
= n_args
.to_a
1782 callsite
.check_signature
(v
, args
)
1788 redef class AAttrFormExpr
1789 # The attribute acceded.
1790 var mproperty
: nullable MAttribute
1792 # The static type of the attribute.
1793 var attr_type
: nullable MType
1795 # Resolve the attribute acceded.
1796 private fun resolve_property
(v
: TypeVisitor)
1798 var recvtype
= v
.visit_expr
(self.n_expr
)
1799 if recvtype
== null then return # Skip error
1800 var name
= self.n_id
.text
1801 if recvtype
isa MNullType then
1802 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1806 var unsafe_type
= v
.anchor_to
(recvtype
)
1807 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1808 if mproperty
== null then
1809 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1812 assert mproperty
isa MAttribute
1813 self.mproperty
= mproperty
1815 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1816 assert mpropdefs
.length
== 1
1817 var mpropdef
= mpropdefs
.first
1818 var attr_type
= mpropdef
.static_mtype
.as(not null)
1819 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1820 self.attr_type
= attr_type
1824 redef class AAttrExpr
1825 redef fun accept_typing
(v
)
1827 self.resolve_property
(v
)
1828 self.mtype
= self.attr_type
1833 redef class AAttrAssignExpr
1834 redef fun accept_typing
(v
)
1836 self.resolve_property
(v
)
1837 var mtype
= self.attr_type
1839 v
.visit_expr_subtype
(self.n_value
, mtype
)
1840 self.is_typed
= true
1844 redef class AAttrReassignExpr
1845 redef fun accept_typing
(v
)
1847 self.resolve_property
(v
)
1848 var mtype
= self.attr_type
1849 if mtype
== null then return # Skip error
1851 self.resolve_reassignment
(v
, mtype
, mtype
)
1853 self.is_typed
= true
1857 redef class AIssetAttrExpr
1858 redef fun accept_typing
(v
)
1860 self.resolve_property
(v
)
1861 var mtype
= self.attr_type
1862 if mtype
== null then return # Skip error
1864 var recvtype
= self.n_expr
.mtype
.as(not null)
1865 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1866 if bound
isa MNullableType then
1867 v
.error
(self, "Error: isset on a nullable attribute.")
1869 self.mtype
= v
.type_bool
(self)
1873 redef class AVarargExpr
1874 redef fun accept_typing
(v
)
1876 # This kind of pseudo-expression can be only processed trough a signature
1877 # See `check_signature`
1878 # Other cases are a syntax error.
1879 v
.error
(self, "Syntax error: unexpected `...`")
1885 redef class ADebugTypeExpr
1886 redef fun accept_typing
(v
)
1888 var expr
= v
.visit_expr
(self.n_expr
)
1889 if expr
== null then return
1890 var unsafe
= v
.anchor_to
(expr
)
1891 var ntype
= self.n_type
1892 var mtype
= v
.resolve_mtype
(ntype
)
1893 if mtype
!= null and mtype
!= expr
then
1894 var umtype
= v
.anchor_to
(mtype
)
1895 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1897 self.is_typed
= true