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
.get_mclass_by_name
(node
, mmodule
, name
)
253 fun type_bool
(node
: ANode): nullable MType
255 var mclass
= self.get_mclass
(node
, "Bool")
256 if mclass
== null then return null
257 return mclass
.mclass_type
260 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
262 var unsafe_type
= self.anchor_to
(recvtype
)
264 #debug("recv: {recvtype} (aka {unsafe_type})")
265 if recvtype
isa MNullType then
266 # `null` only accepts some methods of object.
267 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
268 unsafe_type
= mmodule
.object_type
.as_nullable
270 self.error
(node
, "Error: Method '{name}' call on 'null'.")
275 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
276 if name
== "new" and mproperty
== null then
278 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
281 if mproperty
== null then
282 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
284 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
286 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
291 assert mproperty
isa MMethod
293 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
294 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
296 if not recv_is_self
and mproperty
.is_toplevel
then
297 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
300 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
301 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
305 var info
= mproperty
.deprecation
306 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
309 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
311 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
315 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
317 if propdefs
.length
== 0 then
318 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
320 else if propdefs
.length
== 1 then
321 mpropdef
= propdefs
.first
323 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
324 mpropdef
= mproperty
.intro
328 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
329 if msignature
== null then return null # skip error
330 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
332 var erasure_cast
= false
333 var rettype
= mpropdef
.msignature
.return_mtype
334 if not recv_is_self
and rettype
!= null then
335 rettype
= rettype
.as_notnullable
336 if rettype
isa MParameterType then
337 var erased_rettype
= msignature
.return_mtype
338 assert erased_rettype
!= null
339 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
344 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
348 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
350 var unsafe_type
= self.anchor_to
(recvtype
)
351 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
352 if mproperty
== null then return null
353 return get_method
(node
, recvtype
, name
, recv_is_self
)
357 # Visit the expressions of args and check their conformity with the corresponding type in signature
358 # The point of this method is to handle varargs correctly
359 # Note: The signature must be correctly adapted
360 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
362 var vararg_rank
= msignature
.vararg_rank
363 if vararg_rank
>= 0 then
364 if args
.length
< msignature
.arity
then
365 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
366 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
369 else if args
.length
!= msignature
.arity
then
370 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
374 #debug("CALL {unsafe_type}.{msignature}")
376 var vararg_decl
= args
.length
- msignature
.arity
377 for i
in [0..msignature
.arity
[ do
379 if i
== vararg_rank
then continue # skip the vararg
380 if i
> vararg_rank
then
383 var paramtype
= msignature
.mparameters
[i
].mtype
384 self.visit_expr_subtype
(args
[j
], paramtype
)
386 if vararg_rank
>= 0 then
387 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
388 var first
= args
[vararg_rank
]
389 if vararg_decl
== 0 and first
isa AVarargExpr then
390 var mclass
= get_mclass
(node
, "Array")
391 if mclass
== null then return false # Forward error
392 var array_mtype
= mclass
.get_mtype
([paramtype
])
393 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
394 first
.mtype
= first
.n_expr
.mtype
396 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
397 self.visit_expr_subtype
(args
[j
], paramtype
)
404 fun error
(node
: ANode, message
: String)
406 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
409 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
411 var flow
= node
.after_flow_context
413 self.error
(node
, "No context!")
417 if flow
.vars
.has_key
(variable
) then
418 return flow
.vars
[variable
]
420 #node.debug("*** START Collected for {variable}")
421 var mtypes
= flow
.collect_types
(variable
)
422 #node.debug("**** END Collected for {variable}")
423 if mtypes
== null or mtypes
.length
== 0 then
424 return variable
.declared_type
425 else if mtypes
.length
== 1 then
428 var res
= merge_types
(node
,mtypes
)
429 if res
== null then res
= variable
.declared_type
435 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
437 var flow
= node
.after_flow_context
440 flow
.set_var
(variable
, mtype
)
443 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
445 if col
.length
== 1 then return col
.first
447 if t1
== null then continue # return null
450 if t2
== null then continue # return null
451 if t2
isa MNullableType or t2
isa MNullType then
454 if not is_subtype
(t2
, t1
) then found
= false
457 #print "merge {col.join(" ")} -> {t1}"
461 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
466 # A specific method call site with its associated informations.
468 # The associated node for location
471 # The static type of the receiver (possibly unresolved)
474 # The module where the callsite is present
477 # The anchor to use with `recv` or `msignature`
478 var anchor
: nullable MClassType
480 # Is the receiver self?
481 # If "for_self", virtual types of the signature are kept
482 # If "not_for_self", virtual type are erased
483 var recv_is_self
: Bool
485 # The designated method
486 var mproperty
: MMethod
488 # The statically designated method definition
489 # The most specif one, it is.
490 var mpropdef
: MMethodDef
492 # The resolved signature for the receiver
493 var msignature
: MSignature
495 # Is a implicit cast required on erasure typing policy?
496 var erasure_cast
: Bool
498 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
500 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
505 # The declared type of the variable
506 var declared_type
: nullable MType
509 redef class FlowContext
510 # Store changes of types because of type evolution
511 private var vars
= new HashMap[Variable, nullable MType]
512 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
514 # Adapt the variable to a static type
515 # Warning1: do not modify vars directly.
516 # Warning2: sub-flow may have cached a unadapted variable
517 private fun set_var
(variable
: Variable, mtype
: nullable MType)
519 self.vars
[variable
] = mtype
520 self.cache
.keys
.remove
(variable
)
523 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
525 if cache
.has_key
(variable
) then
526 return cache
[variable
]
528 var res
: nullable Array[nullable MType] = null
529 if vars
.has_key
(variable
) then
530 var mtype
= vars
[variable
]
532 else if self.previous
.is_empty
then
534 res
= [variable
.declared_type
]
536 for flow
in self.previous
do
537 if flow
.is_unreachable
then continue
538 var r2
= flow
.collect_types
(variable
)
539 if r2
== null then continue
544 if not res
.has
(t
) then res
.add
(t
)
549 cache
[variable
] = res
555 # The entry point of the whole typing analysis
556 fun do_typing
(modelbuilder
: ModelBuilder)
560 # The variable associated to the receiver (if any)
561 var selfvariable
: nullable Variable
564 redef class AMethPropdef
565 redef fun do_typing
(modelbuilder
: ModelBuilder)
567 var nblock
= self.n_block
568 if nblock
== null then return
570 var mpropdef
= self.mpropdef
571 if mpropdef
== null then return # skip error
573 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
574 self.selfvariable
= v
.selfvariable
576 var mmethoddef
= self.mpropdef
.as(not null)
577 var msignature
= mmethoddef
.msignature
578 if msignature
== null then return # skip error
579 for i
in [0..msignature
.arity
[ do
580 var mtype
= msignature
.mparameters
[i
].mtype
581 if msignature
.vararg_rank
== i
then
582 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
583 if arrayclass
== null then return # Skip error
584 mtype
= arrayclass
.get_mtype
([mtype
])
586 var variable
= self.n_signature
.n_params
[i
].variable
587 assert variable
!= null
588 variable
.declared_type
= mtype
592 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
593 # We reach the end of the function without having a return, it is bad
594 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
599 redef class AAttrPropdef
600 redef fun do_typing
(modelbuilder
: ModelBuilder)
602 if not has_value
then return
604 var mpropdef
= self.mpropdef
605 if mpropdef
== null then return # skip error
607 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
608 self.selfvariable
= v
.selfvariable
610 var nexpr
= self.n_expr
611 if nexpr
!= null then
612 var mtype
= self.mpropdef
.static_mtype
613 v
.visit_expr_subtype
(nexpr
, mtype
)
615 var nblock
= self.n_block
616 if nblock
!= null then
618 if not nblock
.after_flow_context
.is_unreachable
then
619 # We reach the end of the init without having a return, it is bad
620 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
629 # The static type of the expression.
630 # null if self is a statement or in case of error
631 var mtype
: nullable MType = null
633 # Is the statement correctly typed?
634 # Used to distinguish errors and statements when `mtype == null`
635 var is_typed
: Bool = false
637 # If required, the following implicit cast `.as(XXX)`
638 # Such a cast may by required after evaluating the expression when
639 # a unsafe operation is detected (silently accepted by the Nit language).
640 # The attribute is computed by `check_subtype`
641 var implicit_cast_to
: nullable MType = null
643 # Return the variable read (if any)
644 # Used to perform adaptive typing
645 fun its_variable
: nullable Variable do return null
647 private fun accept_typing
(v
: TypeVisitor)
649 v
.error
(self, "no implemented accept_typing for {self.class_name}")
652 # Is non-null if `self` is a leaf of a comprehension array construction.
653 # In this case, the enclosing literal array node is designated.
654 # The result of the evaluation of `self` must be
655 # stored inside the designated array (there is an implicit `push`)
656 var comprehension
: nullable AArrayExpr = null
659 redef class ABlockExpr
660 redef fun accept_typing
(v
)
662 for e
in self.n_expr
do v
.visit_stmt
(e
)
666 # The type of a blockexpr is the one of the last expression (or null if empty)
669 if self.n_expr
.is_empty
then return null
670 return self.n_expr
.last
.mtype
674 redef class AVardeclExpr
675 redef fun accept_typing
(v
)
677 var variable
= self.variable
678 if variable
== null then return # Skip error
680 var ntype
= self.n_type
681 var mtype
: nullable MType
682 if ntype
== null then
685 mtype
= v
.resolve_mtype
(ntype
)
686 if mtype
== null then return # Skip error
689 var nexpr
= self.n_expr
690 if nexpr
!= null then
691 if mtype
!= null then
692 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
693 if etype
== mtype
then
695 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
698 mtype
= v
.visit_expr
(nexpr
)
699 if mtype
== null then return # Skip error
704 if mtype
== null or mtype
isa MNullType then
705 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
706 if mtype
== null then mtype
= decltype
709 variable
.declared_type
= decltype
710 v
.set_variable
(self, variable
, mtype
)
712 #debug("var {variable}: {mtype}")
719 redef fun its_variable
do return self.variable
720 redef fun accept_typing
(v
)
722 var variable
= self.variable
723 if variable
== null then return # Skip error
725 var mtype
= v
.get_variable
(self, variable
)
726 if mtype
!= null then
727 #debug("{variable} is {mtype}")
729 #debug("{variable} is untyped")
736 redef class AVarAssignExpr
737 redef fun accept_typing
(v
)
739 var variable
= self.variable
740 assert variable
!= null
742 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
744 v
.set_variable
(self, variable
, mtype
)
750 redef class AReassignFormExpr
751 # The method designed by the reassign operator.
752 var reassign_callsite
: nullable CallSite
754 var read_type
: nullable MType = null
756 # Determine the `reassign_property`
757 # `readtype` is the type of the reading of the left value.
758 # `writetype` is the type of the writing of the left value.
759 # (Because of `ACallReassignExpr`, both can be different.
760 # Return the static type of the value to store.
761 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
763 var reassign_name
: String
764 if self.n_assign_op
isa APlusAssignOp then
766 else if self.n_assign_op
isa AMinusAssignOp then
772 self.read_type
= readtype
774 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
775 if callsite
== null then return null # Skip error
776 self.reassign_callsite
= callsite
778 var msignature
= callsite
.msignature
779 var rettype
= msignature
.return_mtype
780 assert msignature
.arity
== 1 and rettype
!= null
782 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
783 if value_type
== null then return null # Skip error
785 v
.check_subtype
(self, rettype
, writetype
)
790 redef class AVarReassignExpr
791 redef fun accept_typing
(v
)
793 var variable
= self.variable
794 assert variable
!= null
796 var readtype
= v
.get_variable
(self, variable
)
797 if readtype
== null then return
801 var writetype
= variable
.declared_type
802 if writetype
== null then return
804 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
806 v
.set_variable
(self, variable
, rettype
)
813 redef class AContinueExpr
814 redef fun accept_typing
(v
)
816 var nexpr
= self.n_expr
817 if nexpr
!= null then
824 redef class ABreakExpr
825 redef fun accept_typing
(v
)
827 var nexpr
= self.n_expr
828 if nexpr
!= null then
835 redef class AReturnExpr
836 redef fun accept_typing
(v
)
838 var nexpr
= self.n_expr
840 var mpropdef
= v
.mpropdef
841 if mpropdef
isa MMethodDef then
842 ret_type
= mpropdef
.msignature
.return_mtype
843 else if mpropdef
isa MAttributeDef then
844 ret_type
= mpropdef
.static_mtype
848 if nexpr
!= null then
849 if ret_type
!= null then
850 v
.visit_expr_subtype
(nexpr
, ret_type
)
853 v
.error
(self, "Error: Return with value in a procedure.")
855 else if ret_type
!= null then
856 v
.error
(self, "Error: Return without value in a function.")
862 redef class AAbortExpr
863 redef fun accept_typing
(v
)
870 redef fun accept_typing
(v
)
872 v
.visit_expr_bool
(n_expr
)
879 if n_then
!= null and n_else
== null then
880 self.mtype
= n_then
.mtype
885 redef class AIfexprExpr
886 redef fun accept_typing
(v
)
888 v
.visit_expr_bool
(n_expr
)
890 var t1
= v
.visit_expr
(n_then
)
891 var t2
= v
.visit_expr
(n_else
)
893 if t1
== null or t2
== null then
897 var t
= v
.merge_types
(self, [t1
, t2
])
899 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
906 redef fun accept_typing
(v
)
908 v
.visit_stmt
(n_block
)
913 redef class AWhileExpr
914 redef fun accept_typing
(v
)
916 v
.visit_expr_bool
(n_expr
)
918 v
.visit_stmt
(n_block
)
923 redef class ALoopExpr
924 redef fun accept_typing
(v
)
926 v
.visit_stmt
(n_block
)
932 var coltype
: nullable MClassType
934 var method_iterator
: nullable CallSite
935 var method_is_ok
: nullable CallSite
936 var method_item
: nullable CallSite
937 var method_next
: nullable CallSite
938 var method_key
: nullable CallSite
939 var method_finish
: nullable CallSite
941 var method_lt
: nullable CallSite
942 var method_successor
: nullable CallSite
944 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
946 if mtype
isa MNullType then
947 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
952 var objcla
= v
.get_mclass
(self, "Object")
953 if objcla
== null then return
955 # check iterator method
956 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
957 if itdef
== null then
958 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
961 self.method_iterator
= itdef
963 # check that iterator return something
964 var ittype
= itdef
.msignature
.return_mtype
965 if ittype
== null then
966 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
971 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
972 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
976 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
978 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
979 var variables
= self.variables
980 if variables
.length
!= 1 then
981 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
983 variables
.first
.declared_type
= coltype
.arguments
.first
988 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
990 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
991 var variables
= self.variables
992 if variables
.length
!= 2 then
993 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
995 variables
[0].declared_type
= coltype
.arguments
[0]
996 variables
[1].declared_type
= coltype
.arguments
[1]
1001 if not is_col
and not is_map
then
1002 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1006 # anchor formal and virtual types
1007 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1009 mtype
= mtype
.as_notnullable
1010 self.coltype
= mtype
.as(MClassType)
1012 # get methods is_ok, next, item
1013 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1014 if ikdef
== null then
1015 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1018 self.method_is_ok
= ikdef
1020 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1021 if itemdef
== null then
1022 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1025 self.method_item
= itemdef
1027 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1028 if nextdef
== null then
1029 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1032 self.method_next
= nextdef
1034 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1037 var keydef
= v
.get_method
(self, ittype
, "key", false)
1038 if keydef
== null then
1039 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1042 self.method_key
= keydef
1045 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1046 var variable
= variables
.first
1047 var vtype
= variable
.declared_type
.as(not null)
1049 if n_expr
isa AOrangeExpr then
1050 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1052 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1055 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1059 redef fun accept_typing
(v
)
1061 var mtype
= v
.visit_expr
(n_expr
)
1062 if mtype
== null then return
1064 self.do_type_iterator
(v
, mtype
)
1066 v
.visit_stmt
(n_block
)
1067 self.mtype
= n_block
.mtype
1068 self.is_typed
= true
1072 redef class AAssertExpr
1073 redef fun accept_typing
(v
)
1075 v
.visit_expr_bool
(n_expr
)
1077 v
.visit_stmt
(n_else
)
1078 self.is_typed
= true
1083 redef fun accept_typing
(v
)
1085 v
.visit_expr_bool
(n_expr
)
1086 v
.visit_expr_bool
(n_expr2
)
1087 self.mtype
= v
.type_bool
(self)
1091 redef class AImpliesExpr
1092 redef fun accept_typing
(v
)
1094 v
.visit_expr_bool
(n_expr
)
1095 v
.visit_expr_bool
(n_expr2
)
1096 self.mtype
= v
.type_bool
(self)
1100 redef class AAndExpr
1101 redef fun accept_typing
(v
)
1103 v
.visit_expr_bool
(n_expr
)
1104 v
.visit_expr_bool
(n_expr2
)
1105 self.mtype
= v
.type_bool
(self)
1110 redef class ANotExpr
1111 redef fun accept_typing
(v
)
1113 v
.visit_expr_bool
(n_expr
)
1114 self.mtype
= v
.type_bool
(self)
1118 redef class AOrElseExpr
1119 redef fun accept_typing
(v
)
1121 var t1
= v
.visit_expr
(n_expr
)
1122 var t2
= v
.visit_expr
(n_expr2
)
1124 if t1
== null or t2
== null then
1128 t1
= t1
.as_notnullable
1130 var t
= v
.merge_types
(self, [t1
, t2
])
1132 t
= v
.mmodule
.object_type
1133 if t2
isa MNullableType then
1136 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1142 redef class ATrueExpr
1143 redef fun accept_typing
(v
)
1145 self.mtype
= v
.type_bool
(self)
1149 redef class AFalseExpr
1150 redef fun accept_typing
(v
)
1152 self.mtype
= v
.type_bool
(self)
1156 redef class AIntExpr
1157 redef fun accept_typing
(v
)
1159 var mclass
= v
.get_mclass
(self, "Int")
1160 if mclass
== null then return # Forward error
1161 self.mtype
= mclass
.mclass_type
1165 redef class AFloatExpr
1166 redef fun accept_typing
(v
)
1168 var mclass
= v
.get_mclass
(self, "Float")
1169 if mclass
== null then return # Forward error
1170 self.mtype
= mclass
.mclass_type
1174 redef class ACharExpr
1175 redef fun accept_typing
(v
)
1177 var mclass
= v
.get_mclass
(self, "Char")
1178 if mclass
== null then return # Forward error
1179 self.mtype
= mclass
.mclass_type
1183 redef class AStringFormExpr
1184 redef fun accept_typing
(v
)
1186 var mclass
= v
.get_mclass
(self, "String")
1187 if mclass
== null then return # Forward error
1188 self.mtype
= mclass
.mclass_type
1192 redef class ASuperstringExpr
1193 redef fun accept_typing
(v
)
1195 var mclass
= v
.get_mclass
(self, "String")
1196 if mclass
== null then return # Forward error
1197 self.mtype
= mclass
.mclass_type
1198 for nexpr
in self.n_exprs
do
1199 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1204 redef class AArrayExpr
1205 # The `with_capacity` method on Array
1206 var with_capacity_callsite
: nullable CallSite
1208 # The `push` method on arrays
1209 var push_callsite
: nullable CallSite
1211 # The element of each type
1212 var element_mtype
: nullable MType
1214 # Set that `self` is a part of comprehension array `na`
1215 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1216 private fun set_comprehension
(n
: nullable AExpr)
1220 else if n
isa AForExpr then
1221 set_comprehension
(n
.n_block
)
1222 else if n
isa AIfExpr then
1223 set_comprehension
(n
.n_then
)
1224 set_comprehension
(n
.n_else
)
1227 n
.comprehension
= self
1230 redef fun accept_typing
(v
)
1232 var mtype
: nullable MType = null
1233 var ntype
= self.n_type
1234 if ntype
!= null then
1235 mtype
= v
.resolve_mtype
(ntype
)
1236 if mtype
== null then return # Skip error
1238 var mtypes
= new Array[nullable MType]
1240 for e
in self.n_exprs
do
1241 var t
= v
.visit_expr
(e
)
1245 set_comprehension
(e
)
1246 if mtype
!= null then
1247 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1248 if t
== mtype
then useless
= true
1253 if mtype
== null then
1254 mtype
= v
.merge_types
(self, mtypes
)
1256 if mtype
== null or mtype
isa MNullType then
1257 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1261 assert ntype
!= null
1262 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1265 self.element_mtype
= mtype
1267 var mclass
= v
.get_mclass
(self, "Array")
1268 if mclass
== null then return # Forward error
1269 var array_mtype
= mclass
.get_mtype
([mtype
])
1271 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1272 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1274 self.mtype
= array_mtype
1278 redef class ARangeExpr
1279 var init_callsite
: nullable CallSite
1281 redef fun accept_typing
(v
)
1283 var discrete_class
= v
.get_mclass
(self, "Discrete")
1284 if discrete_class
== null then return # Forward error
1285 var discrete_type
= discrete_class
.intro
.bound_mtype
1286 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1287 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1288 if t1
== null or t2
== null then return
1289 var mclass
= v
.get_mclass
(self, "Range")
1290 if mclass
== null then return # Forward error
1292 if v
.is_subtype
(t1
, t2
) then
1293 mtype
= mclass
.get_mtype
([t2
])
1294 else if v
.is_subtype
(t2
, t1
) then
1295 mtype
= mclass
.get_mtype
([t1
])
1297 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1303 # get the constructor
1305 if self isa ACrangeExpr then
1306 callsite
= v
.get_method
(self, mtype
, "init", false)
1307 else if self isa AOrangeExpr then
1308 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1312 init_callsite
= callsite
1316 redef class ANullExpr
1317 redef fun accept_typing
(v
)
1319 self.mtype
= v
.mmodule
.model
.null_type
1323 redef class AIsaExpr
1324 # The static type to cast to.
1325 # (different from the static type of the expression that is `Bool`).
1326 var cast_type
: nullable MType
1327 redef fun accept_typing
(v
)
1329 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1330 self.cast_type
= mtype
1332 var variable
= self.n_expr
.its_variable
1333 if variable
!= null then
1334 #var orig = self.n_expr.mtype
1335 #var from = if orig != null then orig.to_s else "invalid"
1336 #var to = if mtype != null then mtype.to_s else "invalid"
1337 #debug("adapt {variable}: {from} -> {to}")
1338 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1341 self.mtype
= v
.type_bool
(self)
1345 redef class AAsCastExpr
1346 redef fun accept_typing
(v
)
1348 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1352 redef class AAsNotnullExpr
1353 redef fun accept_typing
(v
)
1355 var mtype
= v
.visit_expr
(self.n_expr
)
1356 if mtype
== null then return # Forward error
1358 if mtype
isa MNullType then
1359 v
.error
(self, "Type error: as(not null) on null")
1362 if mtype
isa MNullableType then
1363 self.mtype
= mtype
.mtype
1368 if mtype
isa MClassType then
1369 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1372 assert mtype
.need_anchor
1373 var u
= v
.anchor_to
(mtype
)
1374 if not u
isa MNullableType then
1375 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1381 redef class AParExpr
1382 redef fun accept_typing
(v
)
1384 self.mtype
= v
.visit_expr
(self.n_expr
)
1388 redef class AOnceExpr
1389 redef fun accept_typing
(v
)
1391 self.mtype
= v
.visit_expr
(self.n_expr
)
1395 redef class ASelfExpr
1396 redef var its_variable
: nullable Variable
1397 redef fun accept_typing
(v
)
1399 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1400 v
.error
(self, "Error: self cannot be used in top-level method.")
1402 var variable
= v
.selfvariable
1403 self.its_variable
= variable
1404 self.mtype
= v
.get_variable
(self, variable
)
1408 ## MESSAGE SENDING AND PROPERTY
1410 redef class ASendExpr
1411 # The property invoked by the send.
1412 var callsite
: nullable CallSite
1414 redef fun accept_typing
(v
)
1416 var recvtype
= v
.visit_expr
(self.n_expr
)
1417 var name
= self.property_name
1419 if recvtype
== null then return # Forward error
1421 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1422 if callsite
== null then return
1423 self.callsite
= callsite
1424 var msignature
= callsite
.msignature
1426 var args
= compute_raw_arguments
1428 callsite
.check_signature
(v
, args
)
1430 if callsite
.mproperty
.is_init
then
1431 var vmpropdef
= v
.mpropdef
1432 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1433 v
.error
(self, "Can call a init only in another init")
1435 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1436 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1440 var ret
= msignature
.return_mtype
1444 self.is_typed
= true
1448 # The name of the property
1449 # Each subclass simply provide the correct name.
1450 private fun property_name
: String is abstract
1452 # An array of all arguments (excluding self)
1453 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1455 private fun compute_raw_arguments
: Array[AExpr] is abstract
1458 redef class ABinopExpr
1459 redef fun compute_raw_arguments
do return [n_expr2
]
1462 redef fun property_name
do return "=="
1463 redef fun accept_typing
(v
)
1470 redef fun property_name
do return "!="
1471 redef fun accept_typing
(v
)
1478 redef fun property_name
do return "<"
1481 redef fun property_name
do return "<="
1484 redef fun property_name
do return "<<"
1487 redef fun property_name
do return ">"
1490 redef fun property_name
do return ">="
1493 redef fun property_name
do return ">>"
1495 redef class APlusExpr
1496 redef fun property_name
do return "+"
1498 redef class AMinusExpr
1499 redef fun property_name
do return "-"
1501 redef class AStarshipExpr
1502 redef fun property_name
do return "<=>"
1504 redef class AStarExpr
1505 redef fun property_name
do return "*"
1507 redef class AStarstarExpr
1508 redef fun property_name
do return "**"
1510 redef class ASlashExpr
1511 redef fun property_name
do return "/"
1513 redef class APercentExpr
1514 redef fun property_name
do return "%"
1517 redef class AUminusExpr
1518 redef fun property_name
do return "unary -"
1519 redef fun compute_raw_arguments
do return new Array[AExpr]
1523 redef class ACallExpr
1524 redef fun property_name
do return n_id
.text
1525 redef fun compute_raw_arguments
do return n_args
.to_a
1528 redef class ACallAssignExpr
1529 redef fun property_name
do return n_id
.text
+ "="
1530 redef fun compute_raw_arguments
1532 var res
= n_args
.to_a
1538 redef class ABraExpr
1539 redef fun property_name
do return "[]"
1540 redef fun compute_raw_arguments
do return n_args
.to_a
1543 redef class ABraAssignExpr
1544 redef fun property_name
do return "[]="
1545 redef fun compute_raw_arguments
1547 var res
= n_args
.to_a
1553 redef class ASendReassignFormExpr
1554 # The property invoked for the writing
1555 var write_callsite
: nullable CallSite
1557 redef fun accept_typing
(v
)
1559 var recvtype
= v
.visit_expr
(self.n_expr
)
1560 var name
= self.property_name
1562 if recvtype
== null then return # Forward error
1564 var for_self
= self.n_expr
isa ASelfExpr
1565 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1567 if callsite
== null then return
1568 self.callsite
= callsite
1570 var args
= compute_raw_arguments
1572 callsite
.check_signature
(v
, args
)
1574 var readtype
= callsite
.msignature
.return_mtype
1575 if readtype
== null then
1576 v
.error
(self, "Error: {name} is not a function")
1580 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1581 if wcallsite
== null then return
1582 self.write_callsite
= wcallsite
1584 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1585 if wtype
== null then return
1587 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1588 args
.add
(self.n_value
)
1589 wcallsite
.check_signature
(v
, args
)
1591 self.is_typed
= true
1595 redef class ACallReassignExpr
1596 redef fun property_name
do return n_id
.text
1597 redef fun compute_raw_arguments
do return n_args
.to_a
1600 redef class ABraReassignExpr
1601 redef fun property_name
do return "[]"
1602 redef fun compute_raw_arguments
do return n_args
.to_a
1605 redef class AInitExpr
1606 redef fun property_name
do return "init"
1607 redef fun compute_raw_arguments
do return n_args
.to_a
1611 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1616 redef class ASuperExpr
1617 # The method to call if the super is in fact a 'super init call'
1618 # Note: if the super is a normal call-next-method, then this attribute is null
1619 var callsite
: nullable CallSite
1621 # The method to call is the super is a standard `call-next-method` super-call
1622 # Note: if the super is a special super-init-call, then this attribute is null
1623 var mpropdef
: nullable MMethodDef
1625 redef fun accept_typing
(v
)
1627 var anchor
= v
.anchor
1628 assert anchor
!= null
1629 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1630 assert recvtype
!= null
1631 var mproperty
= v
.mpropdef
.mproperty
1632 if not mproperty
isa MMethod then
1633 v
.error
(self, "Error: super only usable in a method")
1636 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1637 if superprops
.length
== 0 then
1638 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1639 process_superinit
(v
)
1642 v
.error
(self, "Error: No super method to call for {mproperty}.")
1645 # FIXME: covariance of return type in linear extension?
1646 var superprop
= superprops
.first
1648 var msignature
= superprop
.msignature
.as(not null)
1649 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1650 var args
= self.n_args
.to_a
1651 if args
.length
> 0 then
1652 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1654 self.mtype
= msignature
.return_mtype
1655 self.is_typed
= true
1656 v
.mpropdef
.has_supercall
= true
1657 mpropdef
= v
.mpropdef
.as(MMethodDef)
1660 private fun process_superinit
(v
: TypeVisitor)
1662 var anchor
= v
.anchor
1663 assert anchor
!= null
1664 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1665 assert recvtype
!= null
1666 var mpropdef
= v
.mpropdef
1667 assert mpropdef
isa MMethodDef
1668 var mproperty
= mpropdef
.mproperty
1669 var superprop
: nullable MMethodDef = null
1670 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1671 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1672 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1673 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1674 if candidate
== null then
1675 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1676 continue # Try next super-class
1678 if superprop
!= null and candidate
.is_root_init
then
1681 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1682 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1685 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1686 if superprop
!= null and superprop
.mproperty
== candidate
then
1687 if superprop
== candidatedefs
.first
then continue
1688 candidatedefs
.add
(superprop
)
1690 if candidatedefs
.length
> 1 then
1691 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1694 superprop
= candidatedefs
.first
1696 if superprop
== null then
1697 v
.error
(self, "Error: No super method to call for {mproperty}.")
1701 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1702 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1704 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1705 self.callsite
= callsite
1707 var args
= self.n_args
.to_a
1708 if args
.length
> 0 then
1709 callsite
.check_signature
(v
, args
)
1711 # Check there is at least enough parameters
1712 if mpropdef
.msignature
.arity
< msignature
.arity
then
1713 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1716 # Check that each needed parameter is conform
1718 for sp
in msignature
.mparameters
do
1719 var p
= mpropdef
.msignature
.mparameters
[i
]
1720 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1721 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1728 self.is_typed
= true
1734 redef class ANewExpr
1735 # The constructor invoked by the new.
1736 var callsite
: nullable CallSite
1738 # The designated type
1739 var recvtype
: nullable MClassType
1741 redef fun accept_typing
(v
)
1743 var recvtype
= v
.resolve_mtype
(self.n_type
)
1744 if recvtype
== null then return
1746 if not recvtype
isa MClassType then
1747 if recvtype
isa MNullableType then
1748 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1751 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1756 self.recvtype
= recvtype
1765 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1766 if callsite
== null then return
1768 if not callsite
.mproperty
.is_new
then
1769 var kind
= recvtype
.mclass
.kind
1770 if kind
!= concrete_kind
then
1771 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1774 self.mtype
= recvtype
1776 self.mtype
= callsite
.msignature
.return_mtype
1777 assert self.mtype
!= null
1780 self.callsite
= callsite
1782 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1783 v
.error
(self, "Error: {name} is not a constructor.")
1787 var args
= n_args
.to_a
1788 callsite
.check_signature
(v
, args
)
1794 redef class AAttrFormExpr
1795 # The attribute acceded.
1796 var mproperty
: nullable MAttribute
1798 # The static type of the attribute.
1799 var attr_type
: nullable MType
1801 # Resolve the attribute acceded.
1802 private fun resolve_property
(v
: TypeVisitor)
1804 var recvtype
= v
.visit_expr
(self.n_expr
)
1805 if recvtype
== null then return # Skip error
1806 var name
= self.n_id
.text
1807 if recvtype
isa MNullType then
1808 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1812 var unsafe_type
= v
.anchor_to
(recvtype
)
1813 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1814 if mproperty
== null then
1815 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1818 assert mproperty
isa MAttribute
1819 self.mproperty
= mproperty
1821 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1822 assert mpropdefs
.length
== 1
1823 var mpropdef
= mpropdefs
.first
1824 var attr_type
= mpropdef
.static_mtype
1825 if attr_type
== null then return # skip error
1826 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1827 self.attr_type
= attr_type
1831 redef class AAttrExpr
1832 redef fun accept_typing
(v
)
1834 self.resolve_property
(v
)
1835 self.mtype
= self.attr_type
1840 redef class AAttrAssignExpr
1841 redef fun accept_typing
(v
)
1843 self.resolve_property
(v
)
1844 var mtype
= self.attr_type
1846 v
.visit_expr_subtype
(self.n_value
, mtype
)
1847 self.is_typed
= true
1851 redef class AAttrReassignExpr
1852 redef fun accept_typing
(v
)
1854 self.resolve_property
(v
)
1855 var mtype
= self.attr_type
1856 if mtype
== null then return # Skip error
1858 self.resolve_reassignment
(v
, mtype
, mtype
)
1860 self.is_typed
= true
1864 redef class AIssetAttrExpr
1865 redef fun accept_typing
(v
)
1867 self.resolve_property
(v
)
1868 var mtype
= self.attr_type
1869 if mtype
== null then return # Skip error
1871 var recvtype
= self.n_expr
.mtype
.as(not null)
1872 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1873 if bound
isa MNullableType then
1874 v
.error
(self, "Error: isset on a nullable attribute.")
1876 self.mtype
= v
.type_bool
(self)
1880 redef class AVarargExpr
1881 redef fun accept_typing
(v
)
1883 # This kind of pseudo-expression can be only processed trough a signature
1884 # See `check_signature`
1885 # Other cases are a syntax error.
1886 v
.error
(self, "Syntax error: unexpected `...`")
1892 redef class ADebugTypeExpr
1893 redef fun accept_typing
(v
)
1895 var expr
= v
.visit_expr
(self.n_expr
)
1896 if expr
== null then return
1897 var unsafe
= v
.anchor_to
(expr
)
1898 var ntype
= self.n_type
1899 var mtype
= v
.resolve_mtype
(ntype
)
1900 if mtype
!= null and mtype
!= expr
then
1901 var umtype
= v
.anchor_to
(mtype
)
1902 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1904 self.is_typed
= true