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
619 # The static type of the expression.
620 # null if self is a statement or in case of error
621 var mtype
: nullable MType = null
623 # Is the statement correctly typed?
624 # Used to distinguish errors and statements when `mtype == null`
625 var is_typed
: Bool = false
627 # If required, the following implicit cast `.as(XXX)`
628 # Such a cast may by required after evaluating the expression when
629 # a unsafe operation is detected (silently accepted by the Nit language).
630 # The attribute is computed by `check_subtype`
631 var implicit_cast_to
: nullable MType = null
633 # Return the variable read (if any)
634 # Used to perform adaptive typing
635 fun its_variable
: nullable Variable do return null
637 private fun accept_typing
(v
: TypeVisitor)
639 v
.error
(self, "no implemented accept_typing for {self.class_name}")
642 # Is non-null if `self` is a leaf of a comprehension array construction.
643 # In this case, the enclosing literal array node is designated.
644 # The result of the evaluation of `self` must be
645 # stored inside the designated array (there is an implicit `push`)
646 var comprehension
: nullable AArrayExpr = null
649 redef class ABlockExpr
650 redef fun accept_typing
(v
)
652 for e
in self.n_expr
do v
.visit_stmt
(e
)
656 # The type of a blockexpr is the one of the last expression (or null if empty)
659 if self.n_expr
.is_empty
then return null
660 return self.n_expr
.last
.mtype
664 redef class AVardeclExpr
665 redef fun accept_typing
(v
)
667 var variable
= self.variable
668 if variable
== null then return # Skip error
670 var ntype
= self.n_type
671 var mtype
: nullable MType
672 if ntype
== null then
675 mtype
= v
.resolve_mtype
(ntype
)
676 if mtype
== null then return # Skip error
679 var nexpr
= self.n_expr
680 if nexpr
!= null then
681 if mtype
!= null then
682 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
683 if etype
== mtype
then
685 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
688 mtype
= v
.visit_expr
(nexpr
)
689 if mtype
== null then return # Skip error
694 if mtype
== null or mtype
isa MNullType then
695 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
696 if mtype
== null then mtype
= decltype
699 variable
.declared_type
= decltype
700 v
.set_variable
(self, variable
, mtype
)
702 #debug("var {variable}: {mtype}")
709 redef fun its_variable
do return self.variable
710 redef fun accept_typing
(v
)
712 var variable
= self.variable
713 if variable
== null then return # Skip error
715 var mtype
= v
.get_variable
(self, variable
)
716 if mtype
!= null then
717 #debug("{variable} is {mtype}")
719 #debug("{variable} is untyped")
726 redef class AVarAssignExpr
727 redef fun accept_typing
(v
)
729 var variable
= self.variable
730 assert variable
!= null
732 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
734 v
.set_variable
(self, variable
, mtype
)
740 redef class AReassignFormExpr
741 # The method designed by the reassign operator.
742 var reassign_callsite
: nullable CallSite
744 var read_type
: nullable MType = null
746 # Determine the `reassign_property`
747 # `readtype` is the type of the reading of the left value.
748 # `writetype` is the type of the writing of the left value.
749 # (Because of `ACallReassignExpr`, both can be different.
750 # Return the static type of the value to store.
751 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
753 var reassign_name
: String
754 if self.n_assign_op
isa APlusAssignOp then
756 else if self.n_assign_op
isa AMinusAssignOp then
762 self.read_type
= readtype
764 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
765 if callsite
== null then return null # Skip error
766 self.reassign_callsite
= callsite
768 var msignature
= callsite
.msignature
769 var rettype
= msignature
.return_mtype
770 assert msignature
.arity
== 1 and rettype
!= null
772 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
773 if value_type
== null then return null # Skip error
775 v
.check_subtype
(self, rettype
, writetype
)
780 redef class AVarReassignExpr
781 redef fun accept_typing
(v
)
783 var variable
= self.variable
784 assert variable
!= null
786 var readtype
= v
.get_variable
(self, variable
)
787 if readtype
== null then return
791 var writetype
= variable
.declared_type
792 if writetype
== null then return
794 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
796 v
.set_variable
(self, variable
, rettype
)
803 redef class AContinueExpr
804 redef fun accept_typing
(v
)
806 var nexpr
= self.n_expr
807 if nexpr
!= null then
814 redef class ABreakExpr
815 redef fun accept_typing
(v
)
817 var nexpr
= self.n_expr
818 if nexpr
!= null then
825 redef class AReturnExpr
826 redef fun accept_typing
(v
)
828 var nexpr
= self.n_expr
830 var mpropdef
= v
.mpropdef
831 if mpropdef
isa MMethodDef then
832 ret_type
= mpropdef
.msignature
.return_mtype
833 else if mpropdef
isa MAttributeDef then
834 ret_type
= mpropdef
.static_mtype
838 if nexpr
!= null then
839 if ret_type
!= null then
840 v
.visit_expr_subtype
(nexpr
, ret_type
)
843 v
.error
(self, "Error: Return with value in a procedure.")
845 else if ret_type
!= null then
846 v
.error
(self, "Error: Return without value in a function.")
852 redef class AAbortExpr
853 redef fun accept_typing
(v
)
860 redef fun accept_typing
(v
)
862 v
.visit_expr_bool
(n_expr
)
869 if n_then
!= null and n_else
== null then
870 self.mtype
= n_then
.mtype
875 redef class AIfexprExpr
876 redef fun accept_typing
(v
)
878 v
.visit_expr_bool
(n_expr
)
880 var t1
= v
.visit_expr
(n_then
)
881 var t2
= v
.visit_expr
(n_else
)
883 if t1
== null or t2
== null then
887 var t
= v
.merge_types
(self, [t1
, t2
])
889 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
896 redef fun accept_typing
(v
)
898 v
.visit_stmt
(n_block
)
903 redef class AWhileExpr
904 redef fun accept_typing
(v
)
906 v
.visit_expr_bool
(n_expr
)
908 v
.visit_stmt
(n_block
)
913 redef class ALoopExpr
914 redef fun accept_typing
(v
)
916 v
.visit_stmt
(n_block
)
922 var coltype
: nullable MClassType
924 var method_iterator
: nullable CallSite
925 var method_is_ok
: nullable CallSite
926 var method_item
: nullable CallSite
927 var method_next
: nullable CallSite
928 var method_key
: nullable CallSite
929 var method_finish
: nullable CallSite
931 var method_lt
: nullable CallSite
932 var method_successor
: nullable CallSite
934 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
936 if mtype
isa MNullType then
937 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
942 var objcla
= v
.get_mclass
(self, "Object")
943 if objcla
== null then return
945 # check iterator method
946 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
947 if itdef
== null then
948 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
951 self.method_iterator
= itdef
953 # check that iterator return something
954 var ittype
= itdef
.msignature
.return_mtype
955 if ittype
== null then
956 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
961 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
962 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
966 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
968 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
969 var variables
= self.variables
970 if variables
.length
!= 1 then
971 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
973 variables
.first
.declared_type
= coltype
.arguments
.first
978 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
980 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
981 var variables
= self.variables
982 if variables
.length
!= 2 then
983 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
985 variables
[0].declared_type
= coltype
.arguments
[0]
986 variables
[1].declared_type
= coltype
.arguments
[1]
991 if not is_col
and not is_map
then
992 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
996 # anchor formal and virtual types
997 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
999 mtype
= mtype
.as_notnullable
1000 self.coltype
= mtype
.as(MClassType)
1002 # get methods is_ok, next, item
1003 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1004 if ikdef
== null then
1005 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1008 self.method_is_ok
= ikdef
1010 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1011 if itemdef
== null then
1012 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1015 self.method_item
= itemdef
1017 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1018 if nextdef
== null then
1019 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1022 self.method_next
= nextdef
1024 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1027 var keydef
= v
.get_method
(self, ittype
, "key", false)
1028 if keydef
== null then
1029 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1032 self.method_key
= keydef
1035 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1036 var variable
= variables
.first
1037 var vtype
= variable
.declared_type
.as(not null)
1039 if n_expr
isa AOrangeExpr then
1040 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1042 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1045 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1049 redef fun accept_typing
(v
)
1051 var mtype
= v
.visit_expr
(n_expr
)
1052 if mtype
== null then return
1054 self.do_type_iterator
(v
, mtype
)
1056 v
.visit_stmt
(n_block
)
1057 self.mtype
= n_block
.mtype
1058 self.is_typed
= true
1062 redef class AAssertExpr
1063 redef fun accept_typing
(v
)
1065 v
.visit_expr_bool
(n_expr
)
1067 v
.visit_stmt
(n_else
)
1068 self.is_typed
= true
1073 redef fun accept_typing
(v
)
1075 v
.visit_expr_bool
(n_expr
)
1076 v
.visit_expr_bool
(n_expr2
)
1077 self.mtype
= v
.type_bool
(self)
1081 redef class AImpliesExpr
1082 redef fun accept_typing
(v
)
1084 v
.visit_expr_bool
(n_expr
)
1085 v
.visit_expr_bool
(n_expr2
)
1086 self.mtype
= v
.type_bool
(self)
1090 redef class AAndExpr
1091 redef fun accept_typing
(v
)
1093 v
.visit_expr_bool
(n_expr
)
1094 v
.visit_expr_bool
(n_expr2
)
1095 self.mtype
= v
.type_bool
(self)
1100 redef class ANotExpr
1101 redef fun accept_typing
(v
)
1103 v
.visit_expr_bool
(n_expr
)
1104 self.mtype
= v
.type_bool
(self)
1108 redef class AOrElseExpr
1109 redef fun accept_typing
(v
)
1111 var t1
= v
.visit_expr
(n_expr
)
1112 var t2
= v
.visit_expr
(n_expr2
)
1114 if t1
== null or t2
== null then
1118 t1
= t1
.as_notnullable
1120 var t
= v
.merge_types
(self, [t1
, t2
])
1122 t
= v
.mmodule
.object_type
1123 if t2
isa MNullableType then
1126 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1132 redef class ATrueExpr
1133 redef fun accept_typing
(v
)
1135 self.mtype
= v
.type_bool
(self)
1139 redef class AFalseExpr
1140 redef fun accept_typing
(v
)
1142 self.mtype
= v
.type_bool
(self)
1146 redef class AIntExpr
1147 redef fun accept_typing
(v
)
1149 var mclass
= v
.get_mclass
(self, "Int")
1150 if mclass
== null then return # Forward error
1151 self.mtype
= mclass
.mclass_type
1155 redef class AFloatExpr
1156 redef fun accept_typing
(v
)
1158 var mclass
= v
.get_mclass
(self, "Float")
1159 if mclass
== null then return # Forward error
1160 self.mtype
= mclass
.mclass_type
1164 redef class ACharExpr
1165 redef fun accept_typing
(v
)
1167 var mclass
= v
.get_mclass
(self, "Char")
1168 if mclass
== null then return # Forward error
1169 self.mtype
= mclass
.mclass_type
1173 redef class AStringFormExpr
1174 redef fun accept_typing
(v
)
1176 var mclass
= v
.get_mclass
(self, "String")
1177 if mclass
== null then return # Forward error
1178 self.mtype
= mclass
.mclass_type
1182 redef class ASuperstringExpr
1183 redef fun accept_typing
(v
)
1185 var mclass
= v
.get_mclass
(self, "String")
1186 if mclass
== null then return # Forward error
1187 self.mtype
= mclass
.mclass_type
1188 for nexpr
in self.n_exprs
do
1189 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1194 redef class AArrayExpr
1195 # The `with_capacity` method on Array
1196 var with_capacity_callsite
: nullable CallSite
1198 # The `push` method on arrays
1199 var push_callsite
: nullable CallSite
1201 # The element of each type
1202 var element_mtype
: nullable MType
1204 # Set that `self` is a part of comprehension array `na`
1205 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1206 private fun set_comprehension
(n
: nullable AExpr)
1210 else if n
isa AForExpr then
1211 set_comprehension
(n
.n_block
)
1212 else if n
isa AIfExpr then
1213 set_comprehension
(n
.n_then
)
1214 set_comprehension
(n
.n_else
)
1217 n
.comprehension
= self
1220 redef fun accept_typing
(v
)
1222 var mtype
: nullable MType = null
1223 var ntype
= self.n_type
1224 if ntype
!= null then
1225 mtype
= v
.resolve_mtype
(ntype
)
1226 if mtype
== null then return # Skip error
1228 var mtypes
= new Array[nullable MType]
1230 for e
in self.n_exprs
do
1231 var t
= v
.visit_expr
(e
)
1235 set_comprehension
(e
)
1236 if mtype
!= null then
1237 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1238 if t
== mtype
then useless
= true
1243 if mtype
== null then
1244 mtype
= v
.merge_types
(self, mtypes
)
1246 if mtype
== null or mtype
isa MNullType then
1247 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1251 assert ntype
!= null
1252 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1255 self.element_mtype
= mtype
1257 var mclass
= v
.get_mclass
(self, "Array")
1258 if mclass
== null then return # Forward error
1259 var array_mtype
= mclass
.get_mtype
([mtype
])
1261 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1262 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1264 self.mtype
= array_mtype
1268 redef class ARangeExpr
1269 var init_callsite
: nullable CallSite
1271 redef fun accept_typing
(v
)
1273 var discrete_class
= v
.get_mclass
(self, "Discrete")
1274 if discrete_class
== null then return # Forward error
1275 var discrete_type
= discrete_class
.intro
.bound_mtype
1276 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1277 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1278 if t1
== null or t2
== null then return
1279 var mclass
= v
.get_mclass
(self, "Range")
1280 if mclass
== null then return # Forward error
1282 if v
.is_subtype
(t1
, t2
) then
1283 mtype
= mclass
.get_mtype
([t2
])
1284 else if v
.is_subtype
(t2
, t1
) then
1285 mtype
= mclass
.get_mtype
([t1
])
1287 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1293 # get the constructor
1295 if self isa ACrangeExpr then
1296 callsite
= v
.get_method
(self, mtype
, "init", false)
1297 else if self isa AOrangeExpr then
1298 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1302 init_callsite
= callsite
1306 redef class ANullExpr
1307 redef fun accept_typing
(v
)
1309 self.mtype
= v
.mmodule
.model
.null_type
1313 redef class AIsaExpr
1314 # The static type to cast to.
1315 # (different from the static type of the expression that is `Bool`).
1316 var cast_type
: nullable MType
1317 redef fun accept_typing
(v
)
1319 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1320 self.cast_type
= mtype
1322 var variable
= self.n_expr
.its_variable
1323 if variable
!= null then
1324 #var orig = self.n_expr.mtype
1325 #var from = if orig != null then orig.to_s else "invalid"
1326 #var to = if mtype != null then mtype.to_s else "invalid"
1327 #debug("adapt {variable}: {from} -> {to}")
1328 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1331 self.mtype
= v
.type_bool
(self)
1335 redef class AAsCastExpr
1336 redef fun accept_typing
(v
)
1338 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1342 redef class AAsNotnullExpr
1343 redef fun accept_typing
(v
)
1345 var mtype
= v
.visit_expr
(self.n_expr
)
1346 if mtype
== null then return # Forward error
1348 if mtype
isa MNullType then
1349 v
.error
(self, "Type error: as(not null) on null")
1352 if mtype
isa MNullableType then
1353 self.mtype
= mtype
.mtype
1358 if mtype
isa MClassType then
1359 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1362 assert mtype
.need_anchor
1363 var u
= v
.anchor_to
(mtype
)
1364 if not u
isa MNullableType then
1365 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1371 redef class AParExpr
1372 redef fun accept_typing
(v
)
1374 self.mtype
= v
.visit_expr
(self.n_expr
)
1378 redef class AOnceExpr
1379 redef fun accept_typing
(v
)
1381 self.mtype
= v
.visit_expr
(self.n_expr
)
1385 redef class ASelfExpr
1386 redef var its_variable
: nullable Variable
1387 redef fun accept_typing
(v
)
1389 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1390 v
.error
(self, "Error: self cannot be used in top-level method.")
1392 var variable
= v
.selfvariable
1393 self.its_variable
= variable
1394 self.mtype
= v
.get_variable
(self, variable
)
1398 ## MESSAGE SENDING AND PROPERTY
1400 redef class ASendExpr
1401 # The property invoked by the send.
1402 var callsite
: nullable CallSite
1404 redef fun accept_typing
(v
)
1406 var recvtype
= v
.visit_expr
(self.n_expr
)
1407 var name
= self.property_name
1409 if recvtype
== null then return # Forward error
1411 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1412 if callsite
== null then return
1413 self.callsite
= callsite
1414 var msignature
= callsite
.msignature
1416 var args
= compute_raw_arguments
1418 callsite
.check_signature
(v
, args
)
1420 if callsite
.mproperty
.is_init
then
1421 var vmpropdef
= v
.mpropdef
1422 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1423 v
.error
(self, "Can call a init only in another init")
1425 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1426 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1430 var ret
= msignature
.return_mtype
1434 self.is_typed
= true
1438 # The name of the property
1439 # Each subclass simply provide the correct name.
1440 private fun property_name
: String is abstract
1442 # An array of all arguments (excluding self)
1443 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1445 private fun compute_raw_arguments
: Array[AExpr] is abstract
1448 redef class ABinopExpr
1449 redef fun compute_raw_arguments
do return [n_expr2
]
1452 redef fun property_name
do return "=="
1453 redef fun accept_typing
(v
)
1460 redef fun property_name
do return "!="
1461 redef fun accept_typing
(v
)
1468 redef fun property_name
do return "<"
1471 redef fun property_name
do return "<="
1474 redef fun property_name
do return "<<"
1477 redef fun property_name
do return ">"
1480 redef fun property_name
do return ">="
1483 redef fun property_name
do return ">>"
1485 redef class APlusExpr
1486 redef fun property_name
do return "+"
1488 redef class AMinusExpr
1489 redef fun property_name
do return "-"
1491 redef class AStarshipExpr
1492 redef fun property_name
do return "<=>"
1494 redef class AStarExpr
1495 redef fun property_name
do return "*"
1497 redef class AStarstarExpr
1498 redef fun property_name
do return "**"
1500 redef class ASlashExpr
1501 redef fun property_name
do return "/"
1503 redef class APercentExpr
1504 redef fun property_name
do return "%"
1507 redef class AUminusExpr
1508 redef fun property_name
do return "unary -"
1509 redef fun compute_raw_arguments
do return new Array[AExpr]
1513 redef class ACallExpr
1514 redef fun property_name
do return n_id
.text
1515 redef fun compute_raw_arguments
do return n_args
.to_a
1518 redef class ACallAssignExpr
1519 redef fun property_name
do return n_id
.text
+ "="
1520 redef fun compute_raw_arguments
1522 var res
= n_args
.to_a
1528 redef class ABraExpr
1529 redef fun property_name
do return "[]"
1530 redef fun compute_raw_arguments
do return n_args
.to_a
1533 redef class ABraAssignExpr
1534 redef fun property_name
do return "[]="
1535 redef fun compute_raw_arguments
1537 var res
= n_args
.to_a
1543 redef class ASendReassignFormExpr
1544 # The property invoked for the writing
1545 var write_callsite
: nullable CallSite
1547 redef fun accept_typing
(v
)
1549 var recvtype
= v
.visit_expr
(self.n_expr
)
1550 var name
= self.property_name
1552 if recvtype
== null then return # Forward error
1554 var for_self
= self.n_expr
isa ASelfExpr
1555 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1557 if callsite
== null then return
1558 self.callsite
= callsite
1560 var args
= compute_raw_arguments
1562 callsite
.check_signature
(v
, args
)
1564 var readtype
= callsite
.msignature
.return_mtype
1565 if readtype
== null then
1566 v
.error
(self, "Error: {name} is not a function")
1570 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1571 if wcallsite
== null then return
1572 self.write_callsite
= wcallsite
1574 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1575 if wtype
== null then return
1577 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1578 args
.add
(self.n_value
)
1579 wcallsite
.check_signature
(v
, args
)
1581 self.is_typed
= true
1585 redef class ACallReassignExpr
1586 redef fun property_name
do return n_id
.text
1587 redef fun compute_raw_arguments
do return n_args
.to_a
1590 redef class ABraReassignExpr
1591 redef fun property_name
do return "[]"
1592 redef fun compute_raw_arguments
do return n_args
.to_a
1595 redef class AInitExpr
1596 redef fun property_name
do return "init"
1597 redef fun compute_raw_arguments
do return n_args
.to_a
1601 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1606 redef class ASuperExpr
1607 # The method to call if the super is in fact a 'super init call'
1608 # Note: if the super is a normal call-next-method, then this attribute is null
1609 var callsite
: nullable CallSite
1611 # The method to call is the super is a standard `call-next-method` super-call
1612 # Note: if the super is a special super-init-call, then this attribute is null
1613 var mpropdef
: nullable MMethodDef
1615 redef fun accept_typing
(v
)
1617 var anchor
= v
.anchor
1618 assert anchor
!= null
1619 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1620 assert recvtype
!= null
1621 var mproperty
= v
.mpropdef
.mproperty
1622 if not mproperty
isa MMethod then
1623 v
.error
(self, "Error: super only usable in a method")
1626 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1627 if superprops
.length
== 0 then
1628 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1629 process_superinit
(v
)
1632 v
.error
(self, "Error: No super method to call for {mproperty}.")
1635 # FIXME: covariance of return type in linear extension?
1636 var superprop
= superprops
.first
1638 var msignature
= superprop
.msignature
.as(not null)
1639 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1640 var args
= self.n_args
.to_a
1641 if args
.length
> 0 then
1642 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1644 self.mtype
= msignature
.return_mtype
1645 self.is_typed
= true
1646 v
.mpropdef
.has_supercall
= true
1647 mpropdef
= v
.mpropdef
.as(MMethodDef)
1650 private fun process_superinit
(v
: TypeVisitor)
1652 var anchor
= v
.anchor
1653 assert anchor
!= null
1654 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1655 assert recvtype
!= null
1656 var mpropdef
= v
.mpropdef
1657 assert mpropdef
isa MMethodDef
1658 var mproperty
= mpropdef
.mproperty
1659 var superprop
: nullable MMethodDef = null
1660 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1661 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1662 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1663 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1664 if candidate
== null then
1665 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1666 continue # Try next super-class
1668 if superprop
!= null and candidate
.is_root_init
then
1671 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1672 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1675 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1676 if superprop
!= null and superprop
.mproperty
== candidate
then
1677 if superprop
== candidatedefs
.first
then continue
1678 candidatedefs
.add
(superprop
)
1680 if candidatedefs
.length
> 1 then
1681 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1684 superprop
= candidatedefs
.first
1686 if superprop
== null then
1687 v
.error
(self, "Error: No super method to call for {mproperty}.")
1691 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1692 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1694 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1695 self.callsite
= callsite
1697 var args
= self.n_args
.to_a
1698 if args
.length
> 0 then
1699 callsite
.check_signature
(v
, args
)
1701 # Check there is at least enough parameters
1702 if mpropdef
.msignature
.arity
< msignature
.arity
then
1703 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1706 # Check that each needed parameter is conform
1708 for sp
in msignature
.mparameters
do
1709 var p
= mpropdef
.msignature
.mparameters
[i
]
1710 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1711 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1718 self.is_typed
= true
1724 redef class ANewExpr
1725 # The constructor invoked by the new.
1726 var callsite
: nullable CallSite
1728 # The designated type
1729 var recvtype
: nullable MClassType
1731 redef fun accept_typing
(v
)
1733 var recvtype
= v
.resolve_mtype
(self.n_type
)
1734 if recvtype
== null then return
1736 if not recvtype
isa MClassType then
1737 if recvtype
isa MNullableType then
1738 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1741 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1746 self.recvtype
= recvtype
1755 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1756 if callsite
== null then return
1758 if not callsite
.mproperty
.is_new
then
1759 var kind
= recvtype
.mclass
.kind
1760 if kind
!= concrete_kind
then
1761 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1764 self.mtype
= recvtype
1766 self.mtype
= callsite
.msignature
.return_mtype
1767 assert self.mtype
!= null
1770 self.callsite
= callsite
1772 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1773 v
.error
(self, "Error: {name} is not a constructor.")
1777 var args
= n_args
.to_a
1778 callsite
.check_signature
(v
, args
)
1784 redef class AAttrFormExpr
1785 # The attribute acceded.
1786 var mproperty
: nullable MAttribute
1788 # The static type of the attribute.
1789 var attr_type
: nullable MType
1791 # Resolve the attribute acceded.
1792 private fun resolve_property
(v
: TypeVisitor)
1794 var recvtype
= v
.visit_expr
(self.n_expr
)
1795 if recvtype
== null then return # Skip error
1796 var name
= self.n_id
.text
1797 if recvtype
isa MNullType then
1798 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1802 var unsafe_type
= v
.anchor_to
(recvtype
)
1803 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1804 if mproperty
== null then
1805 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1808 assert mproperty
isa MAttribute
1809 self.mproperty
= mproperty
1811 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1812 assert mpropdefs
.length
== 1
1813 var mpropdef
= mpropdefs
.first
1814 var attr_type
= mpropdef
.static_mtype
.as(not null)
1815 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1816 self.attr_type
= attr_type
1820 redef class AAttrExpr
1821 redef fun accept_typing
(v
)
1823 self.resolve_property
(v
)
1824 self.mtype
= self.attr_type
1829 redef class AAttrAssignExpr
1830 redef fun accept_typing
(v
)
1832 self.resolve_property
(v
)
1833 var mtype
= self.attr_type
1835 v
.visit_expr_subtype
(self.n_value
, mtype
)
1836 self.is_typed
= true
1840 redef class AAttrReassignExpr
1841 redef fun accept_typing
(v
)
1843 self.resolve_property
(v
)
1844 var mtype
= self.attr_type
1845 if mtype
== null then return # Skip error
1847 self.resolve_reassignment
(v
, mtype
, mtype
)
1849 self.is_typed
= true
1853 redef class AIssetAttrExpr
1854 redef fun accept_typing
(v
)
1856 self.resolve_property
(v
)
1857 var mtype
= self.attr_type
1858 if mtype
== null then return # Skip error
1860 var recvtype
= self.n_expr
.mtype
.as(not null)
1861 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1862 if bound
isa MNullableType then
1863 v
.error
(self, "Error: isset on a nullable attribute.")
1865 self.mtype
= v
.type_bool
(self)
1869 redef class AVarargExpr
1870 redef fun accept_typing
(v
)
1872 # This kind of pseudo-expression can be only processed trough a signature
1873 # See `check_signature`
1874 # Other cases are a syntax error.
1875 v
.error
(self, "Syntax error: unexpected `...`")
1881 redef class ADebugTypeExpr
1882 redef fun accept_typing
(v
)
1884 var expr
= v
.visit_expr
(self.n_expr
)
1885 if expr
== null then return
1886 var unsafe
= v
.anchor_to
(expr
)
1887 var ntype
= self.n_type
1888 var mtype
= v
.resolve_mtype
(ntype
)
1889 if mtype
!= null and mtype
!= expr
then
1890 var umtype
= v
.anchor_to
(mtype
)
1891 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1893 self.is_typed
= true