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 if not has_value
then return
602 var mpropdef
= self.mpropdef
.as(not null)
603 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
604 self.selfvariable
= v
.selfvariable
606 var nexpr
= self.n_expr
607 if nexpr
!= null then
608 var mtype
= self.mpropdef
.static_mtype
609 v
.visit_expr_subtype
(nexpr
, mtype
)
611 var nblock
= self.n_block
612 if nblock
!= null then
614 if not nblock
.after_flow_context
.is_unreachable
then
615 # We reach the end of the init without having a return, it is bad
616 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
625 # The static type of the expression.
626 # null if self is a statement or in case of error
627 var mtype
: nullable MType = null
629 # Is the statement correctly typed?
630 # Used to distinguish errors and statements when `mtype == null`
631 var is_typed
: Bool = false
633 # If required, the following implicit cast `.as(XXX)`
634 # Such a cast may by required after evaluating the expression when
635 # a unsafe operation is detected (silently accepted by the Nit language).
636 # The attribute is computed by `check_subtype`
637 var implicit_cast_to
: nullable MType = null
639 # Return the variable read (if any)
640 # Used to perform adaptive typing
641 fun its_variable
: nullable Variable do return null
643 private fun accept_typing
(v
: TypeVisitor)
645 v
.error
(self, "no implemented accept_typing for {self.class_name}")
648 # Is non-null if `self` is a leaf of a comprehension array construction.
649 # In this case, the enclosing literal array node is designated.
650 # The result of the evaluation of `self` must be
651 # stored inside the designated array (there is an implicit `push`)
652 var comprehension
: nullable AArrayExpr = null
655 redef class ABlockExpr
656 redef fun accept_typing
(v
)
658 for e
in self.n_expr
do v
.visit_stmt
(e
)
662 # The type of a blockexpr is the one of the last expression (or null if empty)
665 if self.n_expr
.is_empty
then return null
666 return self.n_expr
.last
.mtype
670 redef class AVardeclExpr
671 redef fun accept_typing
(v
)
673 var variable
= self.variable
674 if variable
== null then return # Skip error
676 var ntype
= self.n_type
677 var mtype
: nullable MType
678 if ntype
== null then
681 mtype
= v
.resolve_mtype
(ntype
)
682 if mtype
== null then return # Skip error
685 var nexpr
= self.n_expr
686 if nexpr
!= null then
687 if mtype
!= null then
688 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
689 if etype
== mtype
then
691 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
694 mtype
= v
.visit_expr
(nexpr
)
695 if mtype
== null then return # Skip error
700 if mtype
== null or mtype
isa MNullType then
701 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
702 if mtype
== null then mtype
= decltype
705 variable
.declared_type
= decltype
706 v
.set_variable
(self, variable
, mtype
)
708 #debug("var {variable}: {mtype}")
716 redef fun its_variable
do return self.variable
717 redef fun accept_typing
(v
)
719 var variable
= self.variable
720 if variable
== null then return # Skip error
722 var mtype
= v
.get_variable
(self, variable
)
723 if mtype
!= null then
724 #debug("{variable} is {mtype}")
726 #debug("{variable} is untyped")
733 redef class AVarAssignExpr
734 redef fun accept_typing
(v
)
736 var variable
= self.variable
737 assert variable
!= null
739 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
741 v
.set_variable
(self, variable
, mtype
)
747 redef class AReassignFormExpr
748 # The method designed by the reassign operator.
749 var reassign_callsite
: nullable CallSite
751 var read_type
: nullable MType = null
753 # Determine the `reassign_property`
754 # `readtype` is the type of the reading of the left value.
755 # `writetype` is the type of the writing of the left value.
756 # (Because of `ACallReassignExpr`, both can be different.
757 # Return the static type of the value to store.
758 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
760 var reassign_name
: String
761 if self.n_assign_op
isa APlusAssignOp then
763 else if self.n_assign_op
isa AMinusAssignOp then
769 self.read_type
= readtype
771 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
772 if callsite
== null then return null # Skip error
773 self.reassign_callsite
= callsite
775 var msignature
= callsite
.msignature
776 var rettype
= msignature
.return_mtype
777 assert msignature
.arity
== 1 and rettype
!= null
779 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
780 if value_type
== null then return null # Skip error
782 v
.check_subtype
(self, rettype
, writetype
)
787 redef class AVarReassignExpr
788 redef fun accept_typing
(v
)
790 var variable
= self.variable
791 assert variable
!= null
793 var readtype
= v
.get_variable
(self, variable
)
794 if readtype
== null then return
798 var writetype
= variable
.declared_type
799 if writetype
== null then return
801 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
803 v
.set_variable
(self, variable
, rettype
)
810 redef class AContinueExpr
811 redef fun accept_typing
(v
)
813 var nexpr
= self.n_expr
814 if nexpr
!= null then
821 redef class ABreakExpr
822 redef fun accept_typing
(v
)
824 var nexpr
= self.n_expr
825 if nexpr
!= null then
832 redef class AReturnExpr
833 redef fun accept_typing
(v
)
835 var nexpr
= self.n_expr
837 var mpropdef
= v
.mpropdef
838 if mpropdef
isa MMethodDef then
839 ret_type
= mpropdef
.msignature
.return_mtype
840 else if mpropdef
isa MAttributeDef then
841 ret_type
= mpropdef
.static_mtype
845 if nexpr
!= null then
846 if ret_type
!= null then
847 v
.visit_expr_subtype
(nexpr
, ret_type
)
850 v
.error
(self, "Error: Return with value in a procedure.")
852 else if ret_type
!= null then
853 v
.error
(self, "Error: Return without value in a function.")
859 redef class AAbortExpr
860 redef fun accept_typing
(v
)
867 redef fun accept_typing
(v
)
869 v
.visit_expr_bool
(n_expr
)
876 if n_then
!= null and n_else
== null then
877 self.mtype
= n_then
.mtype
882 redef class AIfexprExpr
883 redef fun accept_typing
(v
)
885 v
.visit_expr_bool
(n_expr
)
887 var t1
= v
.visit_expr
(n_then
)
888 var t2
= v
.visit_expr
(n_else
)
890 if t1
== null or t2
== null then
894 var t
= v
.merge_types
(self, [t1
, t2
])
896 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
903 redef fun accept_typing
(v
)
905 v
.visit_stmt
(n_block
)
910 redef class AWhileExpr
911 redef fun accept_typing
(v
)
913 v
.visit_expr_bool
(n_expr
)
915 v
.visit_stmt
(n_block
)
920 redef class ALoopExpr
921 redef fun accept_typing
(v
)
923 v
.visit_stmt
(n_block
)
929 var coltype
: nullable MClassType
931 var method_iterator
: nullable CallSite
932 var method_is_ok
: nullable CallSite
933 var method_item
: nullable CallSite
934 var method_next
: nullable CallSite
935 var method_key
: nullable CallSite
936 var method_finish
: nullable CallSite
938 var method_lt
: nullable CallSite
939 var method_successor
: nullable CallSite
941 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
943 if mtype
isa MNullType then
944 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
949 var objcla
= v
.get_mclass
(self, "Object")
950 if objcla
== null then return
952 # check iterator method
953 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
954 if itdef
== null then
955 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
958 self.method_iterator
= itdef
960 # check that iterator return something
961 var ittype
= itdef
.msignature
.return_mtype
962 if ittype
== null then
963 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
968 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
969 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
973 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
975 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
976 var variables
= self.variables
977 if variables
.length
!= 1 then
978 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
980 variables
.first
.declared_type
= coltype
.arguments
.first
985 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
987 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
988 var variables
= self.variables
989 if variables
.length
!= 2 then
990 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
992 variables
[0].declared_type
= coltype
.arguments
[0]
993 variables
[1].declared_type
= coltype
.arguments
[1]
998 if not is_col
and not is_map
then
999 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1003 # anchor formal and virtual types
1004 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1006 mtype
= mtype
.as_notnullable
1007 self.coltype
= mtype
.as(MClassType)
1009 # get methods is_ok, next, item
1010 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1011 if ikdef
== null then
1012 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1015 self.method_is_ok
= ikdef
1017 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1018 if itemdef
== null then
1019 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1022 self.method_item
= itemdef
1024 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1025 if nextdef
== null then
1026 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1029 self.method_next
= nextdef
1031 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1034 var keydef
= v
.get_method
(self, ittype
, "key", false)
1035 if keydef
== null then
1036 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1039 self.method_key
= keydef
1042 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1043 var variable
= variables
.first
1044 var vtype
= variable
.declared_type
.as(not null)
1046 if n_expr
isa AOrangeExpr then
1047 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1049 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1052 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1056 redef fun accept_typing
(v
)
1058 var mtype
= v
.visit_expr
(n_expr
)
1059 if mtype
== null then return
1061 self.do_type_iterator
(v
, mtype
)
1063 v
.visit_stmt
(n_block
)
1064 self.mtype
= n_block
.mtype
1065 self.is_typed
= true
1069 redef class AWithExpr
1070 var method_start
: nullable CallSite
1071 var method_finish
: nullable CallSite
1073 redef fun accept_typing
(v
: TypeVisitor)
1075 var mtype
= v
.visit_expr
(n_expr
)
1076 if mtype
== null then return
1078 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1079 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1081 v
.visit_stmt
(n_block
)
1082 self.mtype
= n_block
.mtype
1083 self.is_typed
= true
1087 redef class AAssertExpr
1088 redef fun accept_typing
(v
)
1090 v
.visit_expr_bool
(n_expr
)
1092 v
.visit_stmt
(n_else
)
1093 self.is_typed
= true
1098 redef fun accept_typing
(v
)
1100 v
.visit_expr_bool
(n_expr
)
1101 v
.visit_expr_bool
(n_expr2
)
1102 self.mtype
= v
.type_bool
(self)
1106 redef class AImpliesExpr
1107 redef fun accept_typing
(v
)
1109 v
.visit_expr_bool
(n_expr
)
1110 v
.visit_expr_bool
(n_expr2
)
1111 self.mtype
= v
.type_bool
(self)
1115 redef class AAndExpr
1116 redef fun accept_typing
(v
)
1118 v
.visit_expr_bool
(n_expr
)
1119 v
.visit_expr_bool
(n_expr2
)
1120 self.mtype
= v
.type_bool
(self)
1125 redef class ANotExpr
1126 redef fun accept_typing
(v
)
1128 v
.visit_expr_bool
(n_expr
)
1129 self.mtype
= v
.type_bool
(self)
1133 redef class AOrElseExpr
1134 redef fun accept_typing
(v
)
1136 var t1
= v
.visit_expr
(n_expr
)
1137 var t2
= v
.visit_expr
(n_expr2
)
1139 if t1
== null or t2
== null then
1143 t1
= t1
.as_notnullable
1145 var t
= v
.merge_types
(self, [t1
, t2
])
1147 t
= v
.mmodule
.object_type
1148 if t2
isa MNullableType then
1151 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1157 redef class ATrueExpr
1158 redef fun accept_typing
(v
)
1160 self.mtype
= v
.type_bool
(self)
1164 redef class AFalseExpr
1165 redef fun accept_typing
(v
)
1167 self.mtype
= v
.type_bool
(self)
1171 redef class AIntExpr
1172 redef fun accept_typing
(v
)
1174 var mclass
= v
.get_mclass
(self, "Int")
1175 if mclass
== null then return # Forward error
1176 self.mtype
= mclass
.mclass_type
1180 redef class AFloatExpr
1181 redef fun accept_typing
(v
)
1183 var mclass
= v
.get_mclass
(self, "Float")
1184 if mclass
== null then return # Forward error
1185 self.mtype
= mclass
.mclass_type
1189 redef class ACharExpr
1190 redef fun accept_typing
(v
)
1192 var mclass
= v
.get_mclass
(self, "Char")
1193 if mclass
== null then return # Forward error
1194 self.mtype
= mclass
.mclass_type
1198 redef class AStringFormExpr
1199 redef fun accept_typing
(v
)
1201 var mclass
= v
.get_mclass
(self, "String")
1202 if mclass
== null then return # Forward error
1203 self.mtype
= mclass
.mclass_type
1207 redef class ASuperstringExpr
1208 redef fun accept_typing
(v
)
1210 var mclass
= v
.get_mclass
(self, "String")
1211 if mclass
== null then return # Forward error
1212 self.mtype
= mclass
.mclass_type
1213 for nexpr
in self.n_exprs
do
1214 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1219 redef class AArrayExpr
1220 # The `with_capacity` method on Array
1221 var with_capacity_callsite
: nullable CallSite
1223 # The `push` method on arrays
1224 var push_callsite
: nullable CallSite
1226 # The element of each type
1227 var element_mtype
: nullable MType
1229 # Set that `self` is a part of comprehension array `na`
1230 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1231 private fun set_comprehension
(n
: nullable AExpr)
1235 else if n
isa AForExpr then
1236 set_comprehension
(n
.n_block
)
1237 else if n
isa AIfExpr then
1238 set_comprehension
(n
.n_then
)
1239 set_comprehension
(n
.n_else
)
1242 n
.comprehension
= self
1245 redef fun accept_typing
(v
)
1247 var mtype
: nullable MType = null
1248 var ntype
= self.n_type
1249 if ntype
!= null then
1250 mtype
= v
.resolve_mtype
(ntype
)
1251 if mtype
== null then return # Skip error
1253 var mtypes
= new Array[nullable MType]
1255 for e
in self.n_exprs
do
1256 var t
= v
.visit_expr
(e
)
1260 set_comprehension
(e
)
1261 if mtype
!= null then
1262 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1263 if t
== mtype
then useless
= true
1268 if mtype
== null then
1269 mtype
= v
.merge_types
(self, mtypes
)
1271 if mtype
== null or mtype
isa MNullType then
1272 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1276 assert ntype
!= null
1277 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1280 self.element_mtype
= mtype
1282 var mclass
= v
.get_mclass
(self, "Array")
1283 if mclass
== null then return # Forward error
1284 var array_mtype
= mclass
.get_mtype
([mtype
])
1286 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1287 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1289 self.mtype
= array_mtype
1293 redef class ARangeExpr
1294 var init_callsite
: nullable CallSite
1296 redef fun accept_typing
(v
)
1298 var discrete_class
= v
.get_mclass
(self, "Discrete")
1299 if discrete_class
== null then return # Forward error
1300 var discrete_type
= discrete_class
.intro
.bound_mtype
1301 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1302 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1303 if t1
== null or t2
== null then return
1304 var mclass
= v
.get_mclass
(self, "Range")
1305 if mclass
== null then return # Forward error
1307 if v
.is_subtype
(t1
, t2
) then
1308 mtype
= mclass
.get_mtype
([t2
])
1309 else if v
.is_subtype
(t2
, t1
) then
1310 mtype
= mclass
.get_mtype
([t1
])
1312 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1318 # get the constructor
1320 if self isa ACrangeExpr then
1321 callsite
= v
.get_method
(self, mtype
, "init", false)
1322 else if self isa AOrangeExpr then
1323 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1327 init_callsite
= callsite
1331 redef class ANullExpr
1332 redef fun accept_typing
(v
)
1334 self.mtype
= v
.mmodule
.model
.null_type
1338 redef class AIsaExpr
1339 # The static type to cast to.
1340 # (different from the static type of the expression that is `Bool`).
1341 var cast_type
: nullable MType
1342 redef fun accept_typing
(v
)
1344 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1345 self.cast_type
= mtype
1347 var variable
= self.n_expr
.its_variable
1348 if variable
!= null then
1349 #var orig = self.n_expr.mtype
1350 #var from = if orig != null then orig.to_s else "invalid"
1351 #var to = if mtype != null then mtype.to_s else "invalid"
1352 #debug("adapt {variable}: {from} -> {to}")
1353 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1356 self.mtype
= v
.type_bool
(self)
1360 redef class AAsCastExpr
1361 redef fun accept_typing
(v
)
1363 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1367 redef class AAsNotnullExpr
1368 redef fun accept_typing
(v
)
1370 var mtype
= v
.visit_expr
(self.n_expr
)
1371 if mtype
== null then return # Forward error
1373 if mtype
isa MNullType then
1374 v
.error
(self, "Type error: as(not null) on null")
1377 if mtype
isa MNullableType then
1378 self.mtype
= mtype
.mtype
1383 if mtype
isa MClassType then
1384 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1387 assert mtype
.need_anchor
1388 var u
= v
.anchor_to
(mtype
)
1389 if not u
isa MNullableType then
1390 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1396 redef class AParExpr
1397 redef fun accept_typing
(v
)
1399 self.mtype
= v
.visit_expr
(self.n_expr
)
1403 redef class AOnceExpr
1404 redef fun accept_typing
(v
)
1406 self.mtype
= v
.visit_expr
(self.n_expr
)
1410 redef class ASelfExpr
1411 redef var its_variable
: nullable Variable
1412 redef fun accept_typing
(v
)
1414 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1415 v
.error
(self, "Error: self cannot be used in top-level method.")
1417 var variable
= v
.selfvariable
1418 self.its_variable
= variable
1419 self.mtype
= v
.get_variable
(self, variable
)
1423 ## MESSAGE SENDING AND PROPERTY
1425 redef class ASendExpr
1426 # The property invoked by the send.
1427 var callsite
: nullable CallSite
1429 redef fun accept_typing
(v
)
1431 var recvtype
= v
.visit_expr
(self.n_expr
)
1432 var name
= self.property_name
1434 if recvtype
== null then return # Forward error
1436 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1437 if callsite
== null then return
1438 self.callsite
= callsite
1439 var msignature
= callsite
.msignature
1441 var args
= compute_raw_arguments
1443 callsite
.check_signature
(v
, args
)
1445 if callsite
.mproperty
.is_init
then
1446 var vmpropdef
= v
.mpropdef
1447 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1448 v
.error
(self, "Can call a init only in another init")
1450 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1451 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1455 var ret
= msignature
.return_mtype
1459 self.is_typed
= true
1463 # The name of the property
1464 # Each subclass simply provide the correct name.
1465 private fun property_name
: String is abstract
1467 # An array of all arguments (excluding self)
1468 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1470 private fun compute_raw_arguments
: Array[AExpr] is abstract
1473 redef class ABinopExpr
1474 redef fun compute_raw_arguments
do return [n_expr2
]
1477 redef fun property_name
do return "=="
1478 redef fun accept_typing
(v
)
1485 redef fun property_name
do return "!="
1486 redef fun accept_typing
(v
)
1493 redef fun property_name
do return "<"
1496 redef fun property_name
do return "<="
1499 redef fun property_name
do return "<<"
1502 redef fun property_name
do return ">"
1505 redef fun property_name
do return ">="
1508 redef fun property_name
do return ">>"
1510 redef class APlusExpr
1511 redef fun property_name
do return "+"
1513 redef class AMinusExpr
1514 redef fun property_name
do return "-"
1516 redef class AStarshipExpr
1517 redef fun property_name
do return "<=>"
1519 redef class AStarExpr
1520 redef fun property_name
do return "*"
1522 redef class AStarstarExpr
1523 redef fun property_name
do return "**"
1525 redef class ASlashExpr
1526 redef fun property_name
do return "/"
1528 redef class APercentExpr
1529 redef fun property_name
do return "%"
1532 redef class AUminusExpr
1533 redef fun property_name
do return "unary -"
1534 redef fun compute_raw_arguments
do return new Array[AExpr]
1538 redef class ACallExpr
1539 redef fun property_name
do return n_id
.text
1540 redef fun compute_raw_arguments
do return n_args
.to_a
1543 redef class ACallAssignExpr
1544 redef fun property_name
do return n_id
.text
+ "="
1545 redef fun compute_raw_arguments
1547 var res
= n_args
.to_a
1553 redef class ABraExpr
1554 redef fun property_name
do return "[]"
1555 redef fun compute_raw_arguments
do return n_args
.to_a
1558 redef class ABraAssignExpr
1559 redef fun property_name
do return "[]="
1560 redef fun compute_raw_arguments
1562 var res
= n_args
.to_a
1568 redef class ASendReassignFormExpr
1569 # The property invoked for the writing
1570 var write_callsite
: nullable CallSite
1572 redef fun accept_typing
(v
)
1574 var recvtype
= v
.visit_expr
(self.n_expr
)
1575 var name
= self.property_name
1577 if recvtype
== null then return # Forward error
1579 var for_self
= self.n_expr
isa ASelfExpr
1580 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1582 if callsite
== null then return
1583 self.callsite
= callsite
1585 var args
= compute_raw_arguments
1587 callsite
.check_signature
(v
, args
)
1589 var readtype
= callsite
.msignature
.return_mtype
1590 if readtype
== null then
1591 v
.error
(self, "Error: {name} is not a function")
1595 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1596 if wcallsite
== null then return
1597 self.write_callsite
= wcallsite
1599 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1600 if wtype
== null then return
1602 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1603 args
.add
(self.n_value
)
1604 wcallsite
.check_signature
(v
, args
)
1606 self.is_typed
= true
1610 redef class ACallReassignExpr
1611 redef fun property_name
do return n_id
.text
1612 redef fun compute_raw_arguments
do return n_args
.to_a
1615 redef class ABraReassignExpr
1616 redef fun property_name
do return "[]"
1617 redef fun compute_raw_arguments
do return n_args
.to_a
1620 redef class AInitExpr
1621 redef fun property_name
do return "init"
1622 redef fun compute_raw_arguments
do return n_args
.to_a
1626 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1631 redef class ASuperExpr
1632 # The method to call if the super is in fact a 'super init call'
1633 # Note: if the super is a normal call-next-method, then this attribute is null
1634 var callsite
: nullable CallSite
1636 # The method to call is the super is a standard `call-next-method` super-call
1637 # Note: if the super is a special super-init-call, then this attribute is null
1638 var mpropdef
: nullable MMethodDef
1640 redef fun accept_typing
(v
)
1642 var anchor
= v
.anchor
1643 assert anchor
!= null
1644 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1645 assert recvtype
!= null
1646 var mproperty
= v
.mpropdef
.mproperty
1647 if not mproperty
isa MMethod then
1648 v
.error
(self, "Error: super only usable in a method")
1651 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1652 if superprops
.length
== 0 then
1653 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1654 process_superinit
(v
)
1657 v
.error
(self, "Error: No super method to call for {mproperty}.")
1660 # FIXME: covariance of return type in linear extension?
1661 var superprop
= superprops
.first
1663 var msignature
= superprop
.msignature
.as(not null)
1664 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1665 var args
= self.n_args
.to_a
1666 if args
.length
> 0 then
1667 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1669 self.mtype
= msignature
.return_mtype
1670 self.is_typed
= true
1671 v
.mpropdef
.has_supercall
= true
1672 mpropdef
= v
.mpropdef
.as(MMethodDef)
1675 private fun process_superinit
(v
: TypeVisitor)
1677 var anchor
= v
.anchor
1678 assert anchor
!= null
1679 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1680 assert recvtype
!= null
1681 var mpropdef
= v
.mpropdef
1682 assert mpropdef
isa MMethodDef
1683 var mproperty
= mpropdef
.mproperty
1684 var superprop
: nullable MMethodDef = null
1685 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1686 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1687 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1688 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1689 if candidate
== null then
1690 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1691 continue # Try next super-class
1693 if superprop
!= null and candidate
.is_root_init
then
1696 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1697 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1700 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1701 if superprop
!= null and superprop
.mproperty
== candidate
then
1702 if superprop
== candidatedefs
.first
then continue
1703 candidatedefs
.add
(superprop
)
1705 if candidatedefs
.length
> 1 then
1706 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1709 superprop
= candidatedefs
.first
1711 if superprop
== null then
1712 v
.error
(self, "Error: No super method to call for {mproperty}.")
1716 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1717 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1719 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1720 self.callsite
= callsite
1722 var args
= self.n_args
.to_a
1723 if args
.length
> 0 then
1724 callsite
.check_signature
(v
, args
)
1726 # Check there is at least enough parameters
1727 if mpropdef
.msignature
.arity
< msignature
.arity
then
1728 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1731 # Check that each needed parameter is conform
1733 for sp
in msignature
.mparameters
do
1734 var p
= mpropdef
.msignature
.mparameters
[i
]
1735 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1736 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1743 self.is_typed
= true
1749 redef class ANewExpr
1750 # The constructor invoked by the new.
1751 var callsite
: nullable CallSite
1753 # The designated type
1754 var recvtype
: nullable MClassType
1756 redef fun accept_typing
(v
)
1758 var recvtype
= v
.resolve_mtype
(self.n_type
)
1759 if recvtype
== null then return
1761 if not recvtype
isa MClassType then
1762 if recvtype
isa MNullableType then
1763 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1766 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1771 self.recvtype
= recvtype
1780 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1781 if callsite
== null then return
1783 if not callsite
.mproperty
.is_new
then
1784 var kind
= recvtype
.mclass
.kind
1785 if kind
!= concrete_kind
then
1786 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1789 self.mtype
= recvtype
1791 self.mtype
= callsite
.msignature
.return_mtype
1792 assert self.mtype
!= null
1795 self.callsite
= callsite
1797 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1798 v
.error
(self, "Error: {name} is not a constructor.")
1802 var args
= n_args
.to_a
1803 callsite
.check_signature
(v
, args
)
1809 redef class AAttrFormExpr
1810 # The attribute acceded.
1811 var mproperty
: nullable MAttribute
1813 # The static type of the attribute.
1814 var attr_type
: nullable MType
1816 # Resolve the attribute acceded.
1817 private fun resolve_property
(v
: TypeVisitor)
1819 var recvtype
= v
.visit_expr
(self.n_expr
)
1820 if recvtype
== null then return # Skip error
1821 var name
= self.n_id
.text
1822 if recvtype
isa MNullType then
1823 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1827 var unsafe_type
= v
.anchor_to
(recvtype
)
1828 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1829 if mproperty
== null then
1830 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1833 assert mproperty
isa MAttribute
1834 self.mproperty
= mproperty
1836 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1837 assert mpropdefs
.length
== 1
1838 var mpropdef
= mpropdefs
.first
1839 var attr_type
= mpropdef
.static_mtype
.as(not null)
1840 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1841 self.attr_type
= attr_type
1845 redef class AAttrExpr
1846 redef fun accept_typing
(v
)
1848 self.resolve_property
(v
)
1849 self.mtype
= self.attr_type
1854 redef class AAttrAssignExpr
1855 redef fun accept_typing
(v
)
1857 self.resolve_property
(v
)
1858 var mtype
= self.attr_type
1860 v
.visit_expr_subtype
(self.n_value
, mtype
)
1861 self.is_typed
= true
1865 redef class AAttrReassignExpr
1866 redef fun accept_typing
(v
)
1868 self.resolve_property
(v
)
1869 var mtype
= self.attr_type
1870 if mtype
== null then return # Skip error
1872 self.resolve_reassignment
(v
, mtype
, mtype
)
1874 self.is_typed
= true
1878 redef class AIssetAttrExpr
1879 redef fun accept_typing
(v
)
1881 self.resolve_property
(v
)
1882 var mtype
= self.attr_type
1883 if mtype
== null then return # Skip error
1885 var recvtype
= self.n_expr
.mtype
.as(not null)
1886 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1887 if bound
isa MNullableType then
1888 v
.error
(self, "Error: isset on a nullable attribute.")
1890 self.mtype
= v
.type_bool
(self)
1894 redef class AVarargExpr
1895 redef fun accept_typing
(v
)
1897 # This kind of pseudo-expression can be only processed trough a signature
1898 # See `check_signature`
1899 # Other cases are a syntax error.
1900 v
.error
(self, "Syntax error: unexpected `...`")
1906 redef class ADebugTypeExpr
1907 redef fun accept_typing
(v
)
1909 var expr
= v
.visit_expr
(self.n_expr
)
1910 if expr
== null then return
1911 var unsafe
= v
.anchor_to
(expr
)
1912 var ntype
= self.n_type
1913 var mtype
= v
.resolve_mtype
(ntype
)
1914 if mtype
!= null and mtype
!= expr
then
1915 var umtype
= v
.anchor_to
(mtype
)
1916 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1918 self.is_typed
= true