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 self.error
(node
, "Error: Method '{name}' call on 'null'.")
273 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
274 if name
== "new" and mproperty
== null then
276 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
279 if mproperty
== null then
280 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
282 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
284 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
289 assert mproperty
isa MMethod
291 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
292 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
294 if not recv_is_self
and mproperty
.is_toplevel
then
295 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
298 if mproperty
.visibility
== protected_visibility
and not recv_is_self
and self.mmodule
.visibility_for
(mproperty
.intro_mclassdef
.mmodule
) < intrude_visibility
and not modelbuilder
.toolcontext
.opt_ignore_visibility
.value
then
299 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
303 var info
= mproperty
.deprecation
304 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
307 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
309 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
313 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
315 if propdefs
.length
== 0 then
316 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
318 else if propdefs
.length
== 1 then
319 mpropdef
= propdefs
.first
321 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
322 mpropdef
= mproperty
.intro
326 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
327 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
329 var erasure_cast
= false
330 var rettype
= mpropdef
.msignature
.return_mtype
331 if not recv_is_self
and rettype
!= null then
332 rettype
= rettype
.as_notnullable
333 if rettype
isa MParameterType then
334 var erased_rettype
= msignature
.return_mtype
335 assert erased_rettype
!= null
336 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
341 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
345 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
347 var unsafe_type
= self.anchor_to
(recvtype
)
348 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
349 if mproperty
== null then return null
350 return get_method
(node
, recvtype
, name
, recv_is_self
)
354 # Visit the expressions of args and check their conformity with the corresponding type in signature
355 # The point of this method is to handle varargs correctly
356 # Note: The signature must be correctly adapted
357 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
359 var vararg_rank
= msignature
.vararg_rank
360 if vararg_rank
>= 0 then
361 if args
.length
< msignature
.arity
then
362 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
363 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
366 else if args
.length
!= msignature
.arity
then
367 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
371 #debug("CALL {unsafe_type}.{msignature}")
373 var vararg_decl
= args
.length
- msignature
.arity
374 for i
in [0..msignature
.arity
[ do
376 if i
== vararg_rank
then continue # skip the vararg
377 if i
> vararg_rank
then
380 var paramtype
= msignature
.mparameters
[i
].mtype
381 self.visit_expr_subtype
(args
[j
], paramtype
)
383 if vararg_rank
>= 0 then
384 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
385 var first
= args
[vararg_rank
]
386 if vararg_decl
== 0 and first
isa AVarargExpr then
387 var mclass
= get_mclass
(node
, "Array")
388 if mclass
== null then return false # Forward error
389 var array_mtype
= mclass
.get_mtype
([paramtype
])
390 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
391 first
.mtype
= first
.n_expr
.mtype
393 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
394 self.visit_expr_subtype
(args
[j
], paramtype
)
401 fun error
(node
: ANode, message
: String)
403 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
406 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
408 var flow
= node
.after_flow_context
410 self.error
(node
, "No context!")
414 if flow
.vars
.has_key
(variable
) then
415 return flow
.vars
[variable
]
417 #node.debug("*** START Collected for {variable}")
418 var mtypes
= flow
.collect_types
(variable
)
419 #node.debug("**** END Collected for {variable}")
420 if mtypes
== null or mtypes
.length
== 0 then
421 return variable
.declared_type
422 else if mtypes
.length
== 1 then
425 var res
= merge_types
(node
,mtypes
)
426 if res
== null then res
= variable
.declared_type
432 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
434 var flow
= node
.after_flow_context
437 flow
.set_var
(variable
, mtype
)
440 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
442 if col
.length
== 1 then return col
.first
444 if t1
== null then continue # return null
447 if t2
== null then continue # return null
448 if t2
isa MNullableType or t2
isa MNullType then
451 if not is_subtype
(t2
, t1
) then found
= false
454 #print "merge {col.join(" ")} -> {t1}"
458 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
463 # A specific method call site with its associated informations.
465 # The associated node for location
468 # The static type of the receiver (possibly unresolved)
471 # The module where the callsite is present
474 # The anchor to use with `recv` or `msignature`
475 var anchor
: nullable MClassType
477 # Is the receiver self?
478 # If "for_self", virtual types of the signature are kept
479 # If "not_for_self", virtual type are erased
480 var recv_is_self
: Bool
482 # The designated method
483 var mproperty
: MMethod
485 # The statically designated method definition
486 # The most specif one, it is.
487 var mpropdef
: MMethodDef
489 # The resolved signature for the receiver
490 var msignature
: MSignature
492 # Is a implicit cast required on erasure typing policy?
493 var erasure_cast
: Bool
495 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
497 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
502 # The declared type of the variable
503 var declared_type
: nullable MType
506 redef class FlowContext
507 # Store changes of types because of type evolution
508 private var vars
= new HashMap[Variable, nullable MType]
509 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
511 # Adapt the variable to a static type
512 # Warning1: do not modify vars directly.
513 # Warning2: sub-flow may have cached a unadapted variable
514 private fun set_var
(variable
: Variable, mtype
: nullable MType)
516 self.vars
[variable
] = mtype
517 self.cache
.keys
.remove
(variable
)
520 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
522 if cache
.has_key
(variable
) then
523 return cache
[variable
]
525 var res
: nullable Array[nullable MType] = null
526 if vars
.has_key
(variable
) then
527 var mtype
= vars
[variable
]
529 else if self.previous
.is_empty
then
531 res
= [variable
.declared_type
]
533 for flow
in self.previous
do
534 if flow
.is_unreachable
then continue
535 var r2
= flow
.collect_types
(variable
)
536 if r2
== null then continue
541 if not res
.has
(t
) then res
.add
(t
)
546 cache
[variable
] = res
552 # The entry point of the whole typing analysis
553 fun do_typing
(modelbuilder
: ModelBuilder)
557 # The variable associated to the receiver (if any)
558 var selfvariable
: nullable Variable
561 redef class AMethPropdef
562 redef fun do_typing
(modelbuilder
: ModelBuilder)
564 var nblock
= self.n_block
565 if nblock
== null then return
567 var mpropdef
= self.mpropdef
.as(not null)
568 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
569 self.selfvariable
= v
.selfvariable
571 var mmethoddef
= self.mpropdef
.as(not null)
572 for i
in [0..mmethoddef
.msignature
.arity
[ do
573 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
574 if mmethoddef
.msignature
.vararg_rank
== i
then
575 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
576 if arrayclass
== null then return # Skip error
577 mtype
= arrayclass
.get_mtype
([mtype
])
579 var variable
= self.n_signature
.n_params
[i
].variable
580 assert variable
!= null
581 variable
.declared_type
= mtype
585 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
586 # We reach the end of the function without having a return, it is bad
587 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
592 redef class AAttrPropdef
593 redef fun do_typing
(modelbuilder
: ModelBuilder)
595 var mpropdef
= self.mpropdef
.as(not null)
596 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
597 self.selfvariable
= v
.selfvariable
599 var nexpr
= self.n_expr
600 if nexpr
!= null then
601 var mtype
= self.mpropdef
.static_mtype
602 v
.visit_expr_subtype
(nexpr
, mtype
)
604 var nblock
= self.n_block
605 if nblock
!= null then
614 # The static type of the expression.
615 # null if self is a statement or in case of error
616 var mtype
: nullable MType = null
618 # Is the statement correctly typed?
619 # Used to distinguish errors and statements when `mtype == null`
620 var is_typed
: Bool = false
622 # If required, the following implicit cast `.as(XXX)`
623 # Such a cast may by required after evaluating the expression when
624 # a unsafe operation is detected (silently accepted by the Nit language).
625 # The attribute is computed by `check_subtype`
626 var implicit_cast_to
: nullable MType = null
628 # Return the variable read (if any)
629 # Used to perform adaptive typing
630 fun its_variable
: nullable Variable do return null
632 private fun accept_typing
(v
: TypeVisitor)
634 v
.error
(self, "no implemented accept_typing for {self.class_name}")
637 # Is non-null if `self` is a leaf of a comprehension array construction.
638 # In this case, the enclosing literal array node is designated.
639 # The result of the evaluation of `self` must be
640 # stored inside the designated array (there is an implicit `push`)
641 var comprehension
: nullable AArrayExpr = null
644 redef class ABlockExpr
645 redef fun accept_typing
(v
)
647 for e
in self.n_expr
do v
.visit_stmt
(e
)
651 # The type of a blockexpr is the one of the last expression (or null if empty)
654 if self.n_expr
.is_empty
then return null
655 return self.n_expr
.last
.mtype
659 redef class AVardeclExpr
660 redef fun accept_typing
(v
)
662 var variable
= self.variable
663 if variable
== null then return # Skip error
665 var ntype
= self.n_type
666 var mtype
: nullable MType
667 if ntype
== null then
670 mtype
= v
.resolve_mtype
(ntype
)
671 if mtype
== null then return # Skip error
674 var nexpr
= self.n_expr
675 if nexpr
!= null then
676 if mtype
!= null then
677 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
678 if etype
== mtype
then
680 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
683 mtype
= v
.visit_expr
(nexpr
)
684 if mtype
== null then return # Skip error
689 if mtype
== null or mtype
isa MNullType then
690 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
691 if mtype
== null then mtype
= decltype
694 variable
.declared_type
= decltype
695 v
.set_variable
(self, variable
, mtype
)
697 #debug("var {variable}: {mtype}")
704 redef fun its_variable
do return self.variable
705 redef fun accept_typing
(v
)
707 var variable
= self.variable
708 if variable
== null then return # Skip error
710 var mtype
= v
.get_variable
(self, variable
)
711 if mtype
!= null then
712 #debug("{variable} is {mtype}")
714 #debug("{variable} is untyped")
721 redef class AVarAssignExpr
722 redef fun accept_typing
(v
)
724 var variable
= self.variable
725 assert variable
!= null
727 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
729 v
.set_variable
(self, variable
, mtype
)
735 redef class AReassignFormExpr
736 # The method designed by the reassign operator.
737 var reassign_callsite
: nullable CallSite
739 var read_type
: nullable MType = null
741 # Determine the `reassign_property`
742 # `readtype` is the type of the reading of the left value.
743 # `writetype` is the type of the writing of the left value.
744 # (Because of `ACallReassignExpr`, both can be different.
745 # Return the static type of the value to store.
746 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
748 var reassign_name
: String
749 if self.n_assign_op
isa APlusAssignOp then
751 else if self.n_assign_op
isa AMinusAssignOp then
757 self.read_type
= readtype
759 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
760 if callsite
== null then return null # Skip error
761 self.reassign_callsite
= callsite
763 var msignature
= callsite
.msignature
764 var rettype
= msignature
.return_mtype
765 assert msignature
.arity
== 1 and rettype
!= null
767 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
768 if value_type
== null then return null # Skip error
770 v
.check_subtype
(self, rettype
, writetype
)
775 redef class AVarReassignExpr
776 redef fun accept_typing
(v
)
778 var variable
= self.variable
779 assert variable
!= null
781 var readtype
= v
.get_variable
(self, variable
)
782 if readtype
== null then return
786 var writetype
= variable
.declared_type
787 if writetype
== null then return
789 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
791 v
.set_variable
(self, variable
, rettype
)
798 redef class AContinueExpr
799 redef fun accept_typing
(v
)
801 var nexpr
= self.n_expr
802 if nexpr
!= null then
809 redef class ABreakExpr
810 redef fun accept_typing
(v
)
812 var nexpr
= self.n_expr
813 if nexpr
!= null then
820 redef class AReturnExpr
821 redef fun accept_typing
(v
)
823 var nexpr
= self.n_expr
825 var mpropdef
= v
.mpropdef
826 if mpropdef
isa MMethodDef then
827 ret_type
= mpropdef
.msignature
.return_mtype
828 else if mpropdef
isa MAttributeDef then
829 ret_type
= mpropdef
.static_mtype
833 if nexpr
!= null then
834 if ret_type
!= null then
835 v
.visit_expr_subtype
(nexpr
, ret_type
)
838 v
.error
(self, "Error: Return with value in a procedure.")
840 else if ret_type
!= null then
841 v
.error
(self, "Error: Return without value in a function.")
847 redef class AAbortExpr
848 redef fun accept_typing
(v
)
855 redef fun accept_typing
(v
)
857 v
.visit_expr_bool
(n_expr
)
864 if n_then
!= null and n_else
== null then
865 self.mtype
= n_then
.mtype
870 redef class AIfexprExpr
871 redef fun accept_typing
(v
)
873 v
.visit_expr_bool
(n_expr
)
875 var t1
= v
.visit_expr
(n_then
)
876 var t2
= v
.visit_expr
(n_else
)
878 if t1
== null or t2
== null then
882 var t
= v
.merge_types
(self, [t1
, t2
])
884 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
891 redef fun accept_typing
(v
)
893 v
.visit_stmt
(n_block
)
898 redef class AWhileExpr
899 redef fun accept_typing
(v
)
901 v
.visit_expr_bool
(n_expr
)
903 v
.visit_stmt
(n_block
)
908 redef class ALoopExpr
909 redef fun accept_typing
(v
)
911 v
.visit_stmt
(n_block
)
917 var coltype
: nullable MClassType
919 var method_iterator
: nullable CallSite
920 var method_is_ok
: nullable CallSite
921 var method_item
: nullable CallSite
922 var method_next
: nullable CallSite
923 var method_key
: nullable CallSite
924 var method_finish
: nullable CallSite
926 var method_lt
: nullable CallSite
927 var method_successor
: nullable CallSite
929 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
931 if mtype
isa MNullType then
932 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
937 var objcla
= v
.get_mclass
(self, "Object")
938 if objcla
== null then return
940 # check iterator method
941 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
942 if itdef
== null then
943 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
946 self.method_iterator
= itdef
948 # check that iterator return something
949 var ittype
= itdef
.msignature
.return_mtype
950 if ittype
== null then
951 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
956 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
957 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
961 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
963 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
964 var variables
= self.variables
965 if variables
.length
!= 1 then
966 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
968 variables
.first
.declared_type
= coltype
.arguments
.first
973 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
975 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
976 var variables
= self.variables
977 if variables
.length
!= 2 then
978 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
980 variables
[0].declared_type
= coltype
.arguments
[0]
981 variables
[1].declared_type
= coltype
.arguments
[1]
986 if not is_col
and not is_map
then
987 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
991 # anchor formal and virtual types
992 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
994 mtype
= mtype
.as_notnullable
995 self.coltype
= mtype
.as(MClassType)
997 # get methods is_ok, next, item
998 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
999 if ikdef
== null then
1000 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1003 self.method_is_ok
= ikdef
1005 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1006 if itemdef
== null then
1007 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1010 self.method_item
= itemdef
1012 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1013 if nextdef
== null then
1014 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1017 self.method_next
= nextdef
1019 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1022 var keydef
= v
.get_method
(self, ittype
, "key", false)
1023 if keydef
== null then
1024 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1027 self.method_key
= keydef
1030 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1031 var variable
= variables
.first
1032 var vtype
= variable
.declared_type
.as(not null)
1034 if n_expr
isa AOrangeExpr then
1035 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1037 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1040 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1044 redef fun accept_typing
(v
)
1046 var mtype
= v
.visit_expr
(n_expr
)
1047 if mtype
== null then return
1049 self.do_type_iterator
(v
, mtype
)
1051 v
.visit_stmt
(n_block
)
1052 self.mtype
= n_block
.mtype
1053 self.is_typed
= true
1057 redef class AAssertExpr
1058 redef fun accept_typing
(v
)
1060 v
.visit_expr_bool
(n_expr
)
1062 v
.visit_stmt
(n_else
)
1063 self.is_typed
= true
1068 redef fun accept_typing
(v
)
1070 v
.visit_expr_bool
(n_expr
)
1071 v
.visit_expr_bool
(n_expr2
)
1072 self.mtype
= v
.type_bool
(self)
1076 redef class AImpliesExpr
1077 redef fun accept_typing
(v
)
1079 v
.visit_expr_bool
(n_expr
)
1080 v
.visit_expr_bool
(n_expr2
)
1081 self.mtype
= v
.type_bool
(self)
1085 redef class AAndExpr
1086 redef fun accept_typing
(v
)
1088 v
.visit_expr_bool
(n_expr
)
1089 v
.visit_expr_bool
(n_expr2
)
1090 self.mtype
= v
.type_bool
(self)
1095 redef class ANotExpr
1096 redef fun accept_typing
(v
)
1098 v
.visit_expr_bool
(n_expr
)
1099 self.mtype
= v
.type_bool
(self)
1103 redef class AOrElseExpr
1104 redef fun accept_typing
(v
)
1106 var t1
= v
.visit_expr
(n_expr
)
1107 var t2
= v
.visit_expr
(n_expr2
)
1109 if t1
== null or t2
== null then
1113 t1
= t1
.as_notnullable
1115 var t
= v
.merge_types
(self, [t1
, t2
])
1117 t
= v
.mmodule
.object_type
1118 if t2
isa MNullableType then
1121 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1127 redef class ATrueExpr
1128 redef fun accept_typing
(v
)
1130 self.mtype
= v
.type_bool
(self)
1134 redef class AFalseExpr
1135 redef fun accept_typing
(v
)
1137 self.mtype
= v
.type_bool
(self)
1141 redef class AIntExpr
1142 redef fun accept_typing
(v
)
1144 var mclass
= v
.get_mclass
(self, "Int")
1145 if mclass
== null then return # Forward error
1146 self.mtype
= mclass
.mclass_type
1150 redef class AFloatExpr
1151 redef fun accept_typing
(v
)
1153 var mclass
= v
.get_mclass
(self, "Float")
1154 if mclass
== null then return # Forward error
1155 self.mtype
= mclass
.mclass_type
1159 redef class ACharExpr
1160 redef fun accept_typing
(v
)
1162 var mclass
= v
.get_mclass
(self, "Char")
1163 if mclass
== null then return # Forward error
1164 self.mtype
= mclass
.mclass_type
1168 redef class AStringFormExpr
1169 redef fun accept_typing
(v
)
1171 var mclass
= v
.get_mclass
(self, "String")
1172 if mclass
== null then return # Forward error
1173 self.mtype
= mclass
.mclass_type
1177 redef class ASuperstringExpr
1178 redef fun accept_typing
(v
)
1180 var mclass
= v
.get_mclass
(self, "String")
1181 if mclass
== null then return # Forward error
1182 self.mtype
= mclass
.mclass_type
1183 for nexpr
in self.n_exprs
do
1184 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1189 redef class AArrayExpr
1190 # The `with_capacity` method on Array
1191 var with_capacity_callsite
: nullable CallSite
1193 # The `push` method on arrays
1194 var push_callsite
: nullable CallSite
1196 # The element of each type
1197 var element_mtype
: nullable MType
1199 # Set that `self` is a part of comprehension array `na`
1200 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1201 private fun set_comprehension
(n
: nullable AExpr)
1205 else if n
isa AForExpr then
1206 set_comprehension
(n
.n_block
)
1207 else if n
isa AIfExpr then
1208 set_comprehension
(n
.n_then
)
1209 set_comprehension
(n
.n_else
)
1212 n
.comprehension
= self
1215 redef fun accept_typing
(v
)
1217 var mtype
: nullable MType = null
1218 var ntype
= self.n_type
1219 if ntype
!= null then
1220 mtype
= v
.resolve_mtype
(ntype
)
1221 if mtype
== null then return # Skip error
1223 var mtypes
= new Array[nullable MType]
1225 for e
in self.n_exprs
do
1226 var t
= v
.visit_expr
(e
)
1230 set_comprehension
(e
)
1231 if mtype
!= null then
1232 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1233 if t
== mtype
then useless
= true
1238 if mtype
== null then
1239 mtype
= v
.merge_types
(self, mtypes
)
1241 if mtype
== null then
1242 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1246 assert ntype
!= null
1247 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1250 self.element_mtype
= mtype
1252 var mclass
= v
.get_mclass
(self, "Array")
1253 if mclass
== null then return # Forward error
1254 var array_mtype
= mclass
.get_mtype
([mtype
])
1256 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1257 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1259 self.mtype
= array_mtype
1263 redef class ARangeExpr
1264 var init_callsite
: nullable CallSite
1266 redef fun accept_typing
(v
)
1268 var discrete_class
= v
.get_mclass
(self, "Discrete")
1269 if discrete_class
== null then return # Forward error
1270 var discrete_type
= discrete_class
.intro
.bound_mtype
1271 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1272 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1273 if t1
== null or t2
== null then return
1274 var mclass
= v
.get_mclass
(self, "Range")
1275 if mclass
== null then return # Forward error
1277 if v
.is_subtype
(t1
, t2
) then
1278 mtype
= mclass
.get_mtype
([t2
])
1279 else if v
.is_subtype
(t2
, t1
) then
1280 mtype
= mclass
.get_mtype
([t1
])
1282 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1288 # get the constructor
1290 if self isa ACrangeExpr then
1291 callsite
= v
.get_method
(self, mtype
, "init", false)
1292 else if self isa AOrangeExpr then
1293 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1297 init_callsite
= callsite
1301 redef class ANullExpr
1302 redef fun accept_typing
(v
)
1304 self.mtype
= v
.mmodule
.model
.null_type
1308 redef class AIsaExpr
1309 # The static type to cast to.
1310 # (different from the static type of the expression that is `Bool`).
1311 var cast_type
: nullable MType
1312 redef fun accept_typing
(v
)
1314 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1315 self.cast_type
= mtype
1317 var variable
= self.n_expr
.its_variable
1318 if variable
!= null then
1319 #var orig = self.n_expr.mtype
1320 #var from = if orig != null then orig.to_s else "invalid"
1321 #var to = if mtype != null then mtype.to_s else "invalid"
1322 #debug("adapt {variable}: {from} -> {to}")
1323 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1326 self.mtype
= v
.type_bool
(self)
1330 redef class AAsCastExpr
1331 redef fun accept_typing
(v
)
1333 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1337 redef class AAsNotnullExpr
1338 redef fun accept_typing
(v
)
1340 var mtype
= v
.visit_expr
(self.n_expr
)
1341 if mtype
== null then return # Forward error
1343 if mtype
isa MNullType then
1344 v
.error
(self, "Type error: as(not null) on null")
1347 if mtype
isa MNullableType then
1348 self.mtype
= mtype
.mtype
1353 if mtype
isa MClassType then
1354 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1357 assert mtype
.need_anchor
1358 var u
= v
.anchor_to
(mtype
)
1359 if not u
isa MNullableType then
1360 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1366 redef class AParExpr
1367 redef fun accept_typing
(v
)
1369 self.mtype
= v
.visit_expr
(self.n_expr
)
1373 redef class AOnceExpr
1374 redef fun accept_typing
(v
)
1376 self.mtype
= v
.visit_expr
(self.n_expr
)
1380 redef class ASelfExpr
1381 redef var its_variable
: nullable Variable
1382 redef fun accept_typing
(v
)
1384 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1385 v
.error
(self, "Error: self cannot be used in top-level method.")
1387 var variable
= v
.selfvariable
1388 self.its_variable
= variable
1389 self.mtype
= v
.get_variable
(self, variable
)
1393 ## MESSAGE SENDING AND PROPERTY
1395 redef class ASendExpr
1396 # The property invoked by the send.
1397 var callsite
: nullable CallSite
1399 redef fun accept_typing
(v
)
1401 var recvtype
= v
.visit_expr
(self.n_expr
)
1402 var name
= self.property_name
1404 if recvtype
== null then return # Forward error
1406 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1407 if callsite
== null then return
1408 self.callsite
= callsite
1409 var msignature
= callsite
.msignature
1411 var args
= compute_raw_arguments
1413 callsite
.check_signature
(v
, args
)
1415 if callsite
.mproperty
.is_init
then
1416 var vmpropdef
= v
.mpropdef
1417 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1418 v
.error
(self, "Can call a init only in another init")
1420 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1421 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1425 var ret
= msignature
.return_mtype
1429 self.is_typed
= true
1433 # The name of the property
1434 # Each subclass simply provide the correct name.
1435 private fun property_name
: String is abstract
1437 # An array of all arguments (excluding self)
1438 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1440 private fun compute_raw_arguments
: Array[AExpr] is abstract
1443 redef class ABinopExpr
1444 redef fun compute_raw_arguments
do return [n_expr2
]
1447 redef fun property_name
do return "=="
1448 redef fun accept_typing
(v
)
1455 redef fun property_name
do return "!="
1456 redef fun accept_typing
(v
)
1463 redef fun property_name
do return "<"
1466 redef fun property_name
do return "<="
1469 redef fun property_name
do return "<<"
1472 redef fun property_name
do return ">"
1475 redef fun property_name
do return ">="
1478 redef fun property_name
do return ">>"
1480 redef class APlusExpr
1481 redef fun property_name
do return "+"
1483 redef class AMinusExpr
1484 redef fun property_name
do return "-"
1486 redef class AStarshipExpr
1487 redef fun property_name
do return "<=>"
1489 redef class AStarExpr
1490 redef fun property_name
do return "*"
1492 redef class AStarstarExpr
1493 redef fun property_name
do return "**"
1495 redef class ASlashExpr
1496 redef fun property_name
do return "/"
1498 redef class APercentExpr
1499 redef fun property_name
do return "%"
1502 redef class AUminusExpr
1503 redef fun property_name
do return "unary -"
1504 redef fun compute_raw_arguments
do return new Array[AExpr]
1508 redef class ACallExpr
1509 redef fun property_name
do return n_id
.text
1510 redef fun compute_raw_arguments
do return n_args
.to_a
1513 redef class ACallAssignExpr
1514 redef fun property_name
do return n_id
.text
+ "="
1515 redef fun compute_raw_arguments
1517 var res
= n_args
.to_a
1523 redef class ABraExpr
1524 redef fun property_name
do return "[]"
1525 redef fun compute_raw_arguments
do return n_args
.to_a
1528 redef class ABraAssignExpr
1529 redef fun property_name
do return "[]="
1530 redef fun compute_raw_arguments
1532 var res
= n_args
.to_a
1538 redef class ASendReassignFormExpr
1539 # The property invoked for the writing
1540 var write_callsite
: nullable CallSite
1542 redef fun accept_typing
(v
)
1544 var recvtype
= v
.visit_expr
(self.n_expr
)
1545 var name
= self.property_name
1547 if recvtype
== null then return # Forward error
1549 var for_self
= self.n_expr
isa ASelfExpr
1550 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1552 if callsite
== null then return
1553 self.callsite
= callsite
1555 var args
= compute_raw_arguments
1557 callsite
.check_signature
(v
, args
)
1559 var readtype
= callsite
.msignature
.return_mtype
1560 if readtype
== null then
1561 v
.error
(self, "Error: {name} is not a function")
1565 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1566 if wcallsite
== null then return
1567 self.write_callsite
= wcallsite
1569 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1570 if wtype
== null then return
1572 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1573 args
.add
(self.n_value
)
1574 wcallsite
.check_signature
(v
, args
)
1576 self.is_typed
= true
1580 redef class ACallReassignExpr
1581 redef fun property_name
do return n_id
.text
1582 redef fun compute_raw_arguments
do return n_args
.to_a
1585 redef class ABraReassignExpr
1586 redef fun property_name
do return "[]"
1587 redef fun compute_raw_arguments
do return n_args
.to_a
1590 redef class AInitExpr
1591 redef fun property_name
do return "init"
1592 redef fun compute_raw_arguments
do return n_args
.to_a
1596 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1601 redef class ASuperExpr
1602 # The method to call if the super is in fact a 'super init call'
1603 # Note: if the super is a normal call-next-method, then this attribute is null
1604 var callsite
: nullable CallSite
1606 # The method to call is the super is a standard `call-next-method` super-call
1607 # Note: if the super is a special super-init-call, then this attribute is null
1608 var mpropdef
: nullable MMethodDef
1610 redef fun accept_typing
(v
)
1612 var anchor
= v
.anchor
1613 assert anchor
!= null
1614 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1615 assert recvtype
!= null
1616 var mproperty
= v
.mpropdef
.mproperty
1617 if not mproperty
isa MMethod then
1618 v
.error
(self, "Error: super only usable in a method")
1621 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1622 if superprops
.length
== 0 then
1623 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1624 process_superinit
(v
)
1627 v
.error
(self, "Error: No super method to call for {mproperty}.")
1630 # FIXME: covariance of return type in linear extension?
1631 var superprop
= superprops
.first
1633 var msignature
= superprop
.msignature
.as(not null)
1634 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1635 var args
= self.n_args
.to_a
1636 if args
.length
> 0 then
1637 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1639 self.mtype
= msignature
.return_mtype
1640 self.is_typed
= true
1641 v
.mpropdef
.has_supercall
= true
1642 mpropdef
= v
.mpropdef
.as(MMethodDef)
1645 private fun process_superinit
(v
: TypeVisitor)
1647 var anchor
= v
.anchor
1648 assert anchor
!= null
1649 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1650 assert recvtype
!= null
1651 var mpropdef
= v
.mpropdef
1652 assert mpropdef
isa MMethodDef
1653 var mproperty
= mpropdef
.mproperty
1654 var superprop
: nullable MMethodDef = null
1655 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1656 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1657 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1658 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1659 if candidate
== null then
1660 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1661 continue # Try next super-class
1663 if superprop
!= null and candidate
.is_root_init
then
1666 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1667 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1670 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1671 if superprop
!= null and superprop
.mproperty
== candidate
then
1672 if superprop
== candidatedefs
.first
then continue
1673 candidatedefs
.add
(superprop
)
1675 if candidatedefs
.length
> 1 then
1676 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1679 superprop
= candidatedefs
.first
1681 if superprop
== null then
1682 v
.error
(self, "Error: No super method to call for {mproperty}.")
1686 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1687 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1689 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1690 self.callsite
= callsite
1692 var args
= self.n_args
.to_a
1693 if args
.length
> 0 then
1694 callsite
.check_signature
(v
, args
)
1696 # Check there is at least enough parameters
1697 if mpropdef
.msignature
.arity
< msignature
.arity
then
1698 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1701 # Check that each needed parameter is conform
1703 for sp
in msignature
.mparameters
do
1704 var p
= mpropdef
.msignature
.mparameters
[i
]
1705 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1706 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1713 self.is_typed
= true
1719 redef class ANewExpr
1720 # The constructor invoked by the new.
1721 var callsite
: nullable CallSite
1723 # The designated type
1724 var recvtype
: nullable MClassType
1726 redef fun accept_typing
(v
)
1728 var recvtype
= v
.resolve_mtype
(self.n_type
)
1729 if recvtype
== null then return
1731 if not recvtype
isa MClassType then
1732 if recvtype
isa MNullableType then
1733 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1736 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1741 self.recvtype
= recvtype
1750 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1751 if callsite
== null then return
1753 if not callsite
.mproperty
.is_new
then
1754 var kind
= recvtype
.mclass
.kind
1755 if kind
!= concrete_kind
then
1756 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1759 self.mtype
= recvtype
1761 self.mtype
= callsite
.msignature
.return_mtype
1762 assert self.mtype
!= null
1765 self.callsite
= callsite
1767 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1768 v
.error
(self, "Error: {name} is not a constructor.")
1772 var args
= n_args
.to_a
1773 callsite
.check_signature
(v
, args
)
1779 redef class AAttrFormExpr
1780 # The attribute acceded.
1781 var mproperty
: nullable MAttribute
1783 # The static type of the attribute.
1784 var attr_type
: nullable MType
1786 # Resolve the attribute acceded.
1787 private fun resolve_property
(v
: TypeVisitor)
1789 var recvtype
= v
.visit_expr
(self.n_expr
)
1790 if recvtype
== null then return # Skip error
1791 var name
= self.n_id
.text
1792 if recvtype
isa MNullType then
1793 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1797 var unsafe_type
= v
.anchor_to
(recvtype
)
1798 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1799 if mproperty
== null then
1800 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1803 assert mproperty
isa MAttribute
1804 self.mproperty
= mproperty
1806 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1807 assert mpropdefs
.length
== 1
1808 var mpropdef
= mpropdefs
.first
1809 var attr_type
= mpropdef
.static_mtype
.as(not null)
1810 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1811 self.attr_type
= attr_type
1815 redef class AAttrExpr
1816 redef fun accept_typing
(v
)
1818 self.resolve_property
(v
)
1819 self.mtype
= self.attr_type
1824 redef class AAttrAssignExpr
1825 redef fun accept_typing
(v
)
1827 self.resolve_property
(v
)
1828 var mtype
= self.attr_type
1830 v
.visit_expr_subtype
(self.n_value
, mtype
)
1831 self.is_typed
= true
1835 redef class AAttrReassignExpr
1836 redef fun accept_typing
(v
)
1838 self.resolve_property
(v
)
1839 var mtype
= self.attr_type
1840 if mtype
== null then return # Skip error
1842 self.resolve_reassignment
(v
, mtype
, mtype
)
1844 self.is_typed
= true
1848 redef class AIssetAttrExpr
1849 redef fun accept_typing
(v
)
1851 self.resolve_property
(v
)
1852 var mtype
= self.attr_type
1853 if mtype
== null then return # Skip error
1855 var recvtype
= self.n_expr
.mtype
.as(not null)
1856 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1857 if bound
isa MNullableType then
1858 v
.error
(self, "Error: isset on a nullable attribute.")
1860 self.mtype
= v
.type_bool
(self)
1864 redef class AVarargExpr
1865 redef fun accept_typing
(v
)
1867 # This kind of pseudo-expression can be only processed trough a signature
1868 # See `check_signature`
1869 # Other cases are a syntax error.
1870 v
.error
(self, "Syntax error: unexpected `...`")
1876 redef class ADebugTypeExpr
1877 redef fun accept_typing
(v
)
1879 var expr
= v
.visit_expr
(self.n_expr
)
1880 if expr
== null then return
1881 var unsafe
= v
.anchor_to
(expr
)
1882 var ntype
= self.n_type
1883 var mtype
= v
.resolve_mtype
(ntype
)
1884 if mtype
!= null and mtype
!= expr
then
1885 var umtype
= v
.anchor_to
(mtype
)
1886 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1888 self.is_typed
= true