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
.as(not null)
329 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
331 var erasure_cast
= false
332 var rettype
= mpropdef
.msignature
.return_mtype
333 if not recv_is_self
and rettype
!= null then
334 rettype
= rettype
.as_notnullable
335 if rettype
isa MParameterType then
336 var erased_rettype
= msignature
.return_mtype
337 assert erased_rettype
!= null
338 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
343 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
347 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
349 var unsafe_type
= self.anchor_to
(recvtype
)
350 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
351 if mproperty
== null then return null
352 return get_method
(node
, recvtype
, name
, recv_is_self
)
356 # Visit the expressions of args and check their conformity with the corresponding type in signature
357 # The point of this method is to handle varargs correctly
358 # Note: The signature must be correctly adapted
359 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
361 var vararg_rank
= msignature
.vararg_rank
362 if vararg_rank
>= 0 then
363 if args
.length
< msignature
.arity
then
364 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
365 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
368 else if args
.length
!= msignature
.arity
then
369 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
373 #debug("CALL {unsafe_type}.{msignature}")
375 var vararg_decl
= args
.length
- msignature
.arity
376 for i
in [0..msignature
.arity
[ do
378 if i
== vararg_rank
then continue # skip the vararg
379 if i
> vararg_rank
then
382 var paramtype
= msignature
.mparameters
[i
].mtype
383 self.visit_expr_subtype
(args
[j
], paramtype
)
385 if vararg_rank
>= 0 then
386 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
387 var first
= args
[vararg_rank
]
388 if vararg_decl
== 0 and first
isa AVarargExpr then
389 var mclass
= get_mclass
(node
, "Array")
390 if mclass
== null then return false # Forward error
391 var array_mtype
= mclass
.get_mtype
([paramtype
])
392 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
393 first
.mtype
= first
.n_expr
.mtype
395 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
396 self.visit_expr_subtype
(args
[j
], paramtype
)
403 fun error
(node
: ANode, message
: String)
405 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
408 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
410 var flow
= node
.after_flow_context
412 self.error
(node
, "No context!")
416 if flow
.vars
.has_key
(variable
) then
417 return flow
.vars
[variable
]
419 #node.debug("*** START Collected for {variable}")
420 var mtypes
= flow
.collect_types
(variable
)
421 #node.debug("**** END Collected for {variable}")
422 if mtypes
== null or mtypes
.length
== 0 then
423 return variable
.declared_type
424 else if mtypes
.length
== 1 then
427 var res
= merge_types
(node
,mtypes
)
428 if res
== null then res
= variable
.declared_type
434 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
436 var flow
= node
.after_flow_context
439 flow
.set_var
(variable
, mtype
)
442 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
444 if col
.length
== 1 then return col
.first
446 if t1
== null then continue # return null
449 if t2
== null then continue # return null
450 if t2
isa MNullableType or t2
isa MNullType then
453 if not is_subtype
(t2
, t1
) then found
= false
456 #print "merge {col.join(" ")} -> {t1}"
460 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
465 # A specific method call site with its associated informations.
467 # The associated node for location
470 # The static type of the receiver (possibly unresolved)
473 # The module where the callsite is present
476 # The anchor to use with `recv` or `msignature`
477 var anchor
: nullable MClassType
479 # Is the receiver self?
480 # If "for_self", virtual types of the signature are kept
481 # If "not_for_self", virtual type are erased
482 var recv_is_self
: Bool
484 # The designated method
485 var mproperty
: MMethod
487 # The statically designated method definition
488 # The most specif one, it is.
489 var mpropdef
: MMethodDef
491 # The resolved signature for the receiver
492 var msignature
: MSignature
494 # Is a implicit cast required on erasure typing policy?
495 var erasure_cast
: Bool
497 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
499 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
504 # The declared type of the variable
505 var declared_type
: nullable MType
508 redef class FlowContext
509 # Store changes of types because of type evolution
510 private var vars
= new HashMap[Variable, nullable MType]
511 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
513 # Adapt the variable to a static type
514 # Warning1: do not modify vars directly.
515 # Warning2: sub-flow may have cached a unadapted variable
516 private fun set_var
(variable
: Variable, mtype
: nullable MType)
518 self.vars
[variable
] = mtype
519 self.cache
.keys
.remove
(variable
)
522 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
524 if cache
.has_key
(variable
) then
525 return cache
[variable
]
527 var res
: nullable Array[nullable MType] = null
528 if vars
.has_key
(variable
) then
529 var mtype
= vars
[variable
]
531 else if self.previous
.is_empty
then
533 res
= [variable
.declared_type
]
535 for flow
in self.previous
do
536 if flow
.is_unreachable
then continue
537 var r2
= flow
.collect_types
(variable
)
538 if r2
== null then continue
543 if not res
.has
(t
) then res
.add
(t
)
548 cache
[variable
] = res
554 # The entry point of the whole typing analysis
555 fun do_typing
(modelbuilder
: ModelBuilder)
559 # The variable associated to the receiver (if any)
560 var selfvariable
: nullable Variable
563 redef class AMethPropdef
564 redef fun do_typing
(modelbuilder
: ModelBuilder)
566 var nblock
= self.n_block
567 if nblock
== null then return
569 var mpropdef
= self.mpropdef
.as(not null)
570 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
571 self.selfvariable
= v
.selfvariable
573 var mmethoddef
= self.mpropdef
.as(not null)
574 for i
in [0..mmethoddef
.msignature
.arity
[ do
575 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
576 if mmethoddef
.msignature
.vararg_rank
== i
then
577 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
578 if arrayclass
== null then return # Skip error
579 mtype
= arrayclass
.get_mtype
([mtype
])
581 var variable
= self.n_signature
.n_params
[i
].variable
582 assert variable
!= null
583 variable
.declared_type
= mtype
587 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
588 # We reach the end of the function without having a return, it is bad
589 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
594 redef class AAttrPropdef
595 redef fun do_typing
(modelbuilder
: ModelBuilder)
597 if not has_value
then return
599 var mpropdef
= self.mpropdef
.as(not null)
600 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
601 self.selfvariable
= v
.selfvariable
603 var nexpr
= self.n_expr
604 if nexpr
!= null then
605 var mtype
= self.mpropdef
.static_mtype
606 v
.visit_expr_subtype
(nexpr
, mtype
)
608 var nblock
= self.n_block
609 if nblock
!= null then
611 if not nblock
.after_flow_context
.is_unreachable
then
612 # We reach the end of the init without having a return, it is bad
613 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
622 # The static type of the expression.
623 # null if self is a statement or in case of error
624 var mtype
: nullable MType = null
626 # Is the statement correctly typed?
627 # Used to distinguish errors and statements when `mtype == null`
628 var is_typed
: Bool = false
630 # If required, the following implicit cast `.as(XXX)`
631 # Such a cast may by required after evaluating the expression when
632 # a unsafe operation is detected (silently accepted by the Nit language).
633 # The attribute is computed by `check_subtype`
634 var implicit_cast_to
: nullable MType = null
636 # Return the variable read (if any)
637 # Used to perform adaptive typing
638 fun its_variable
: nullable Variable do return null
640 private fun accept_typing
(v
: TypeVisitor)
642 v
.error
(self, "no implemented accept_typing for {self.class_name}")
645 # Is non-null if `self` is a leaf of a comprehension array construction.
646 # In this case, the enclosing literal array node is designated.
647 # The result of the evaluation of `self` must be
648 # stored inside the designated array (there is an implicit `push`)
649 var comprehension
: nullable AArrayExpr = null
652 redef class ABlockExpr
653 redef fun accept_typing
(v
)
655 for e
in self.n_expr
do v
.visit_stmt
(e
)
659 # The type of a blockexpr is the one of the last expression (or null if empty)
662 if self.n_expr
.is_empty
then return null
663 return self.n_expr
.last
.mtype
667 redef class AVardeclExpr
668 redef fun accept_typing
(v
)
670 var variable
= self.variable
671 if variable
== null then return # Skip error
673 var ntype
= self.n_type
674 var mtype
: nullable MType
675 if ntype
== null then
678 mtype
= v
.resolve_mtype
(ntype
)
679 if mtype
== null then return # Skip error
682 var nexpr
= self.n_expr
683 if nexpr
!= null then
684 if mtype
!= null then
685 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
686 if etype
== mtype
then
688 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
691 mtype
= v
.visit_expr
(nexpr
)
692 if mtype
== null then return # Skip error
697 if mtype
== null or mtype
isa MNullType then
698 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
699 if mtype
== null then mtype
= decltype
702 variable
.declared_type
= decltype
703 v
.set_variable
(self, variable
, mtype
)
705 #debug("var {variable}: {mtype}")
712 redef fun its_variable
do return self.variable
713 redef fun accept_typing
(v
)
715 var variable
= self.variable
716 if variable
== null then return # Skip error
718 var mtype
= v
.get_variable
(self, variable
)
719 if mtype
!= null then
720 #debug("{variable} is {mtype}")
722 #debug("{variable} is untyped")
729 redef class AVarAssignExpr
730 redef fun accept_typing
(v
)
732 var variable
= self.variable
733 assert variable
!= null
735 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
737 v
.set_variable
(self, variable
, mtype
)
743 redef class AReassignFormExpr
744 # The method designed by the reassign operator.
745 var reassign_callsite
: nullable CallSite
747 var read_type
: nullable MType = null
749 # Determine the `reassign_property`
750 # `readtype` is the type of the reading of the left value.
751 # `writetype` is the type of the writing of the left value.
752 # (Because of `ACallReassignExpr`, both can be different.
753 # Return the static type of the value to store.
754 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
756 var reassign_name
: String
757 if self.n_assign_op
isa APlusAssignOp then
759 else if self.n_assign_op
isa AMinusAssignOp then
765 self.read_type
= readtype
767 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
768 if callsite
== null then return null # Skip error
769 self.reassign_callsite
= callsite
771 var msignature
= callsite
.msignature
772 var rettype
= msignature
.return_mtype
773 assert msignature
.arity
== 1 and rettype
!= null
775 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
776 if value_type
== null then return null # Skip error
778 v
.check_subtype
(self, rettype
, writetype
)
783 redef class AVarReassignExpr
784 redef fun accept_typing
(v
)
786 var variable
= self.variable
787 assert variable
!= null
789 var readtype
= v
.get_variable
(self, variable
)
790 if readtype
== null then return
794 var writetype
= variable
.declared_type
795 if writetype
== null then return
797 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
799 v
.set_variable
(self, variable
, rettype
)
806 redef class AContinueExpr
807 redef fun accept_typing
(v
)
809 var nexpr
= self.n_expr
810 if nexpr
!= null then
817 redef class ABreakExpr
818 redef fun accept_typing
(v
)
820 var nexpr
= self.n_expr
821 if nexpr
!= null then
828 redef class AReturnExpr
829 redef fun accept_typing
(v
)
831 var nexpr
= self.n_expr
833 var mpropdef
= v
.mpropdef
834 if mpropdef
isa MMethodDef then
835 ret_type
= mpropdef
.msignature
.return_mtype
836 else if mpropdef
isa MAttributeDef then
837 ret_type
= mpropdef
.static_mtype
841 if nexpr
!= null then
842 if ret_type
!= null then
843 v
.visit_expr_subtype
(nexpr
, ret_type
)
846 v
.error
(self, "Error: Return with value in a procedure.")
848 else if ret_type
!= null then
849 v
.error
(self, "Error: Return without value in a function.")
855 redef class AAbortExpr
856 redef fun accept_typing
(v
)
863 redef fun accept_typing
(v
)
865 v
.visit_expr_bool
(n_expr
)
872 if n_then
!= null and n_else
== null then
873 self.mtype
= n_then
.mtype
878 redef class AIfexprExpr
879 redef fun accept_typing
(v
)
881 v
.visit_expr_bool
(n_expr
)
883 var t1
= v
.visit_expr
(n_then
)
884 var t2
= v
.visit_expr
(n_else
)
886 if t1
== null or t2
== null then
890 var t
= v
.merge_types
(self, [t1
, t2
])
892 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
899 redef fun accept_typing
(v
)
901 v
.visit_stmt
(n_block
)
906 redef class AWhileExpr
907 redef fun accept_typing
(v
)
909 v
.visit_expr_bool
(n_expr
)
911 v
.visit_stmt
(n_block
)
916 redef class ALoopExpr
917 redef fun accept_typing
(v
)
919 v
.visit_stmt
(n_block
)
925 var coltype
: nullable MClassType
927 var method_iterator
: nullable CallSite
928 var method_is_ok
: nullable CallSite
929 var method_item
: nullable CallSite
930 var method_next
: nullable CallSite
931 var method_key
: nullable CallSite
932 var method_finish
: nullable CallSite
934 var method_lt
: nullable CallSite
935 var method_successor
: nullable CallSite
937 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
939 if mtype
isa MNullType then
940 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
945 var objcla
= v
.get_mclass
(self, "Object")
946 if objcla
== null then return
948 # check iterator method
949 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
950 if itdef
== null then
951 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
954 self.method_iterator
= itdef
956 # check that iterator return something
957 var ittype
= itdef
.msignature
.return_mtype
958 if ittype
== null then
959 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
964 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
965 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
969 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
971 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
972 var variables
= self.variables
973 if variables
.length
!= 1 then
974 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
976 variables
.first
.declared_type
= coltype
.arguments
.first
981 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
983 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
984 var variables
= self.variables
985 if variables
.length
!= 2 then
986 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
988 variables
[0].declared_type
= coltype
.arguments
[0]
989 variables
[1].declared_type
= coltype
.arguments
[1]
994 if not is_col
and not is_map
then
995 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
999 # anchor formal and virtual types
1000 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1002 mtype
= mtype
.as_notnullable
1003 self.coltype
= mtype
.as(MClassType)
1005 # get methods is_ok, next, item
1006 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1007 if ikdef
== null then
1008 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1011 self.method_is_ok
= ikdef
1013 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1014 if itemdef
== null then
1015 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1018 self.method_item
= itemdef
1020 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1021 if nextdef
== null then
1022 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1025 self.method_next
= nextdef
1027 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1030 var keydef
= v
.get_method
(self, ittype
, "key", false)
1031 if keydef
== null then
1032 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1035 self.method_key
= keydef
1038 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1039 var variable
= variables
.first
1040 var vtype
= variable
.declared_type
.as(not null)
1042 if n_expr
isa AOrangeExpr then
1043 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1045 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1048 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1052 redef fun accept_typing
(v
)
1054 var mtype
= v
.visit_expr
(n_expr
)
1055 if mtype
== null then return
1057 self.do_type_iterator
(v
, mtype
)
1059 v
.visit_stmt
(n_block
)
1060 self.mtype
= n_block
.mtype
1061 self.is_typed
= true
1065 redef class AAssertExpr
1066 redef fun accept_typing
(v
)
1068 v
.visit_expr_bool
(n_expr
)
1070 v
.visit_stmt
(n_else
)
1071 self.is_typed
= true
1076 redef fun accept_typing
(v
)
1078 v
.visit_expr_bool
(n_expr
)
1079 v
.visit_expr_bool
(n_expr2
)
1080 self.mtype
= v
.type_bool
(self)
1084 redef class AImpliesExpr
1085 redef fun accept_typing
(v
)
1087 v
.visit_expr_bool
(n_expr
)
1088 v
.visit_expr_bool
(n_expr2
)
1089 self.mtype
= v
.type_bool
(self)
1093 redef class AAndExpr
1094 redef fun accept_typing
(v
)
1096 v
.visit_expr_bool
(n_expr
)
1097 v
.visit_expr_bool
(n_expr2
)
1098 self.mtype
= v
.type_bool
(self)
1103 redef class ANotExpr
1104 redef fun accept_typing
(v
)
1106 v
.visit_expr_bool
(n_expr
)
1107 self.mtype
= v
.type_bool
(self)
1111 redef class AOrElseExpr
1112 redef fun accept_typing
(v
)
1114 var t1
= v
.visit_expr
(n_expr
)
1115 var t2
= v
.visit_expr
(n_expr2
)
1117 if t1
== null or t2
== null then
1121 t1
= t1
.as_notnullable
1123 var t
= v
.merge_types
(self, [t1
, t2
])
1125 t
= v
.mmodule
.object_type
1126 if t2
isa MNullableType then
1129 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1135 redef class ATrueExpr
1136 redef fun accept_typing
(v
)
1138 self.mtype
= v
.type_bool
(self)
1142 redef class AFalseExpr
1143 redef fun accept_typing
(v
)
1145 self.mtype
= v
.type_bool
(self)
1149 redef class AIntExpr
1150 redef fun accept_typing
(v
)
1152 var mclass
= v
.get_mclass
(self, "Int")
1153 if mclass
== null then return # Forward error
1154 self.mtype
= mclass
.mclass_type
1158 redef class AFloatExpr
1159 redef fun accept_typing
(v
)
1161 var mclass
= v
.get_mclass
(self, "Float")
1162 if mclass
== null then return # Forward error
1163 self.mtype
= mclass
.mclass_type
1167 redef class ACharExpr
1168 redef fun accept_typing
(v
)
1170 var mclass
= v
.get_mclass
(self, "Char")
1171 if mclass
== null then return # Forward error
1172 self.mtype
= mclass
.mclass_type
1176 redef class AStringFormExpr
1177 redef fun accept_typing
(v
)
1179 var mclass
= v
.get_mclass
(self, "String")
1180 if mclass
== null then return # Forward error
1181 self.mtype
= mclass
.mclass_type
1185 redef class ASuperstringExpr
1186 redef fun accept_typing
(v
)
1188 var mclass
= v
.get_mclass
(self, "String")
1189 if mclass
== null then return # Forward error
1190 self.mtype
= mclass
.mclass_type
1191 for nexpr
in self.n_exprs
do
1192 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1197 redef class AArrayExpr
1198 # The `with_capacity` method on Array
1199 var with_capacity_callsite
: nullable CallSite
1201 # The `push` method on arrays
1202 var push_callsite
: nullable CallSite
1204 # The element of each type
1205 var element_mtype
: nullable MType
1207 # Set that `self` is a part of comprehension array `na`
1208 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1209 private fun set_comprehension
(n
: nullable AExpr)
1213 else if n
isa AForExpr then
1214 set_comprehension
(n
.n_block
)
1215 else if n
isa AIfExpr then
1216 set_comprehension
(n
.n_then
)
1217 set_comprehension
(n
.n_else
)
1220 n
.comprehension
= self
1223 redef fun accept_typing
(v
)
1225 var mtype
: nullable MType = null
1226 var ntype
= self.n_type
1227 if ntype
!= null then
1228 mtype
= v
.resolve_mtype
(ntype
)
1229 if mtype
== null then return # Skip error
1231 var mtypes
= new Array[nullable MType]
1233 for e
in self.n_exprs
do
1234 var t
= v
.visit_expr
(e
)
1238 set_comprehension
(e
)
1239 if mtype
!= null then
1240 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1241 if t
== mtype
then useless
= true
1246 if mtype
== null then
1247 mtype
= v
.merge_types
(self, mtypes
)
1249 if mtype
== null or mtype
isa MNullType then
1250 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1254 assert ntype
!= null
1255 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1258 self.element_mtype
= mtype
1260 var mclass
= v
.get_mclass
(self, "Array")
1261 if mclass
== null then return # Forward error
1262 var array_mtype
= mclass
.get_mtype
([mtype
])
1264 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1265 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1267 self.mtype
= array_mtype
1271 redef class ARangeExpr
1272 var init_callsite
: nullable CallSite
1274 redef fun accept_typing
(v
)
1276 var discrete_class
= v
.get_mclass
(self, "Discrete")
1277 if discrete_class
== null then return # Forward error
1278 var discrete_type
= discrete_class
.intro
.bound_mtype
1279 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1280 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1281 if t1
== null or t2
== null then return
1282 var mclass
= v
.get_mclass
(self, "Range")
1283 if mclass
== null then return # Forward error
1285 if v
.is_subtype
(t1
, t2
) then
1286 mtype
= mclass
.get_mtype
([t2
])
1287 else if v
.is_subtype
(t2
, t1
) then
1288 mtype
= mclass
.get_mtype
([t1
])
1290 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1296 # get the constructor
1298 if self isa ACrangeExpr then
1299 callsite
= v
.get_method
(self, mtype
, "init", false)
1300 else if self isa AOrangeExpr then
1301 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1305 init_callsite
= callsite
1309 redef class ANullExpr
1310 redef fun accept_typing
(v
)
1312 self.mtype
= v
.mmodule
.model
.null_type
1316 redef class AIsaExpr
1317 # The static type to cast to.
1318 # (different from the static type of the expression that is `Bool`).
1319 var cast_type
: nullable MType
1320 redef fun accept_typing
(v
)
1322 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1323 self.cast_type
= mtype
1325 var variable
= self.n_expr
.its_variable
1326 if variable
!= null then
1327 #var orig = self.n_expr.mtype
1328 #var from = if orig != null then orig.to_s else "invalid"
1329 #var to = if mtype != null then mtype.to_s else "invalid"
1330 #debug("adapt {variable}: {from} -> {to}")
1331 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1334 self.mtype
= v
.type_bool
(self)
1338 redef class AAsCastExpr
1339 redef fun accept_typing
(v
)
1341 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1345 redef class AAsNotnullExpr
1346 redef fun accept_typing
(v
)
1348 var mtype
= v
.visit_expr
(self.n_expr
)
1349 if mtype
== null then return # Forward error
1351 if mtype
isa MNullType then
1352 v
.error
(self, "Type error: as(not null) on null")
1355 if mtype
isa MNullableType then
1356 self.mtype
= mtype
.mtype
1361 if mtype
isa MClassType then
1362 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1365 assert mtype
.need_anchor
1366 var u
= v
.anchor_to
(mtype
)
1367 if not u
isa MNullableType then
1368 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1374 redef class AParExpr
1375 redef fun accept_typing
(v
)
1377 self.mtype
= v
.visit_expr
(self.n_expr
)
1381 redef class AOnceExpr
1382 redef fun accept_typing
(v
)
1384 self.mtype
= v
.visit_expr
(self.n_expr
)
1388 redef class ASelfExpr
1389 redef var its_variable
: nullable Variable
1390 redef fun accept_typing
(v
)
1392 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1393 v
.error
(self, "Error: self cannot be used in top-level method.")
1395 var variable
= v
.selfvariable
1396 self.its_variable
= variable
1397 self.mtype
= v
.get_variable
(self, variable
)
1401 ## MESSAGE SENDING AND PROPERTY
1403 redef class ASendExpr
1404 # The property invoked by the send.
1405 var callsite
: nullable CallSite
1407 redef fun accept_typing
(v
)
1409 var recvtype
= v
.visit_expr
(self.n_expr
)
1410 var name
= self.property_name
1412 if recvtype
== null then return # Forward error
1414 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1415 if callsite
== null then return
1416 self.callsite
= callsite
1417 var msignature
= callsite
.msignature
1419 var args
= compute_raw_arguments
1421 callsite
.check_signature
(v
, args
)
1423 if callsite
.mproperty
.is_init
then
1424 var vmpropdef
= v
.mpropdef
1425 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1426 v
.error
(self, "Can call a init only in another init")
1428 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1429 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1433 var ret
= msignature
.return_mtype
1437 self.is_typed
= true
1441 # The name of the property
1442 # Each subclass simply provide the correct name.
1443 private fun property_name
: String is abstract
1445 # An array of all arguments (excluding self)
1446 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1448 private fun compute_raw_arguments
: Array[AExpr] is abstract
1451 redef class ABinopExpr
1452 redef fun compute_raw_arguments
do return [n_expr2
]
1455 redef fun property_name
do return "=="
1456 redef fun accept_typing
(v
)
1463 redef fun property_name
do return "!="
1464 redef fun accept_typing
(v
)
1471 redef fun property_name
do return "<"
1474 redef fun property_name
do return "<="
1477 redef fun property_name
do return "<<"
1480 redef fun property_name
do return ">"
1483 redef fun property_name
do return ">="
1486 redef fun property_name
do return ">>"
1488 redef class APlusExpr
1489 redef fun property_name
do return "+"
1491 redef class AMinusExpr
1492 redef fun property_name
do return "-"
1494 redef class AStarshipExpr
1495 redef fun property_name
do return "<=>"
1497 redef class AStarExpr
1498 redef fun property_name
do return "*"
1500 redef class AStarstarExpr
1501 redef fun property_name
do return "**"
1503 redef class ASlashExpr
1504 redef fun property_name
do return "/"
1506 redef class APercentExpr
1507 redef fun property_name
do return "%"
1510 redef class AUminusExpr
1511 redef fun property_name
do return "unary -"
1512 redef fun compute_raw_arguments
do return new Array[AExpr]
1516 redef class ACallExpr
1517 redef fun property_name
do return n_id
.text
1518 redef fun compute_raw_arguments
do return n_args
.to_a
1521 redef class ACallAssignExpr
1522 redef fun property_name
do return n_id
.text
+ "="
1523 redef fun compute_raw_arguments
1525 var res
= n_args
.to_a
1531 redef class ABraExpr
1532 redef fun property_name
do return "[]"
1533 redef fun compute_raw_arguments
do return n_args
.to_a
1536 redef class ABraAssignExpr
1537 redef fun property_name
do return "[]="
1538 redef fun compute_raw_arguments
1540 var res
= n_args
.to_a
1546 redef class ASendReassignFormExpr
1547 # The property invoked for the writing
1548 var write_callsite
: nullable CallSite
1550 redef fun accept_typing
(v
)
1552 var recvtype
= v
.visit_expr
(self.n_expr
)
1553 var name
= self.property_name
1555 if recvtype
== null then return # Forward error
1557 var for_self
= self.n_expr
isa ASelfExpr
1558 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1560 if callsite
== null then return
1561 self.callsite
= callsite
1563 var args
= compute_raw_arguments
1565 callsite
.check_signature
(v
, args
)
1567 var readtype
= callsite
.msignature
.return_mtype
1568 if readtype
== null then
1569 v
.error
(self, "Error: {name} is not a function")
1573 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1574 if wcallsite
== null then return
1575 self.write_callsite
= wcallsite
1577 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1578 if wtype
== null then return
1580 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1581 args
.add
(self.n_value
)
1582 wcallsite
.check_signature
(v
, args
)
1584 self.is_typed
= true
1588 redef class ACallReassignExpr
1589 redef fun property_name
do return n_id
.text
1590 redef fun compute_raw_arguments
do return n_args
.to_a
1593 redef class ABraReassignExpr
1594 redef fun property_name
do return "[]"
1595 redef fun compute_raw_arguments
do return n_args
.to_a
1598 redef class AInitExpr
1599 redef fun property_name
do return "init"
1600 redef fun compute_raw_arguments
do return n_args
.to_a
1604 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1609 redef class ASuperExpr
1610 # The method to call if the super is in fact a 'super init call'
1611 # Note: if the super is a normal call-next-method, then this attribute is null
1612 var callsite
: nullable CallSite
1614 # The method to call is the super is a standard `call-next-method` super-call
1615 # Note: if the super is a special super-init-call, then this attribute is null
1616 var mpropdef
: nullable MMethodDef
1618 redef fun accept_typing
(v
)
1620 var anchor
= v
.anchor
1621 assert anchor
!= null
1622 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1623 assert recvtype
!= null
1624 var mproperty
= v
.mpropdef
.mproperty
1625 if not mproperty
isa MMethod then
1626 v
.error
(self, "Error: super only usable in a method")
1629 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1630 if superprops
.length
== 0 then
1631 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1632 process_superinit
(v
)
1635 v
.error
(self, "Error: No super method to call for {mproperty}.")
1638 # FIXME: covariance of return type in linear extension?
1639 var superprop
= superprops
.first
1641 var msignature
= superprop
.msignature
.as(not null)
1642 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1643 var args
= self.n_args
.to_a
1644 if args
.length
> 0 then
1645 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1647 self.mtype
= msignature
.return_mtype
1648 self.is_typed
= true
1649 v
.mpropdef
.has_supercall
= true
1650 mpropdef
= v
.mpropdef
.as(MMethodDef)
1653 private fun process_superinit
(v
: TypeVisitor)
1655 var anchor
= v
.anchor
1656 assert anchor
!= null
1657 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1658 assert recvtype
!= null
1659 var mpropdef
= v
.mpropdef
1660 assert mpropdef
isa MMethodDef
1661 var mproperty
= mpropdef
.mproperty
1662 var superprop
: nullable MMethodDef = null
1663 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1664 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1665 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1666 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1667 if candidate
== null then
1668 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1669 continue # Try next super-class
1671 if superprop
!= null and candidate
.is_root_init
then
1674 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1675 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1678 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1679 if superprop
!= null and superprop
.mproperty
== candidate
then
1680 if superprop
== candidatedefs
.first
then continue
1681 candidatedefs
.add
(superprop
)
1683 if candidatedefs
.length
> 1 then
1684 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1687 superprop
= candidatedefs
.first
1689 if superprop
== null then
1690 v
.error
(self, "Error: No super method to call for {mproperty}.")
1694 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1695 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1697 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1698 self.callsite
= callsite
1700 var args
= self.n_args
.to_a
1701 if args
.length
> 0 then
1702 callsite
.check_signature
(v
, args
)
1704 # Check there is at least enough parameters
1705 if mpropdef
.msignature
.arity
< msignature
.arity
then
1706 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1709 # Check that each needed parameter is conform
1711 for sp
in msignature
.mparameters
do
1712 var p
= mpropdef
.msignature
.mparameters
[i
]
1713 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1714 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1721 self.is_typed
= true
1727 redef class ANewExpr
1728 # The constructor invoked by the new.
1729 var callsite
: nullable CallSite
1731 # The designated type
1732 var recvtype
: nullable MClassType
1734 redef fun accept_typing
(v
)
1736 var recvtype
= v
.resolve_mtype
(self.n_type
)
1737 if recvtype
== null then return
1739 if not recvtype
isa MClassType then
1740 if recvtype
isa MNullableType then
1741 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1744 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1749 self.recvtype
= recvtype
1758 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1759 if callsite
== null then return
1761 if not callsite
.mproperty
.is_new
then
1762 var kind
= recvtype
.mclass
.kind
1763 if kind
!= concrete_kind
then
1764 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1767 self.mtype
= recvtype
1769 self.mtype
= callsite
.msignature
.return_mtype
1770 assert self.mtype
!= null
1773 self.callsite
= callsite
1775 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1776 v
.error
(self, "Error: {name} is not a constructor.")
1780 var args
= n_args
.to_a
1781 callsite
.check_signature
(v
, args
)
1787 redef class AAttrFormExpr
1788 # The attribute acceded.
1789 var mproperty
: nullable MAttribute
1791 # The static type of the attribute.
1792 var attr_type
: nullable MType
1794 # Resolve the attribute acceded.
1795 private fun resolve_property
(v
: TypeVisitor)
1797 var recvtype
= v
.visit_expr
(self.n_expr
)
1798 if recvtype
== null then return # Skip error
1799 var name
= self.n_id
.text
1800 if recvtype
isa MNullType then
1801 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1805 var unsafe_type
= v
.anchor_to
(recvtype
)
1806 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1807 if mproperty
== null then
1808 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1811 assert mproperty
isa MAttribute
1812 self.mproperty
= mproperty
1814 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1815 assert mpropdefs
.length
== 1
1816 var mpropdef
= mpropdefs
.first
1817 var attr_type
= mpropdef
.static_mtype
.as(not null)
1818 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1819 self.attr_type
= attr_type
1823 redef class AAttrExpr
1824 redef fun accept_typing
(v
)
1826 self.resolve_property
(v
)
1827 self.mtype
= self.attr_type
1832 redef class AAttrAssignExpr
1833 redef fun accept_typing
(v
)
1835 self.resolve_property
(v
)
1836 var mtype
= self.attr_type
1838 v
.visit_expr_subtype
(self.n_value
, mtype
)
1839 self.is_typed
= true
1843 redef class AAttrReassignExpr
1844 redef fun accept_typing
(v
)
1846 self.resolve_property
(v
)
1847 var mtype
= self.attr_type
1848 if mtype
== null then return # Skip error
1850 self.resolve_reassignment
(v
, mtype
, mtype
)
1852 self.is_typed
= true
1856 redef class AIssetAttrExpr
1857 redef fun accept_typing
(v
)
1859 self.resolve_property
(v
)
1860 var mtype
= self.attr_type
1861 if mtype
== null then return # Skip error
1863 var recvtype
= self.n_expr
.mtype
.as(not null)
1864 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1865 if bound
isa MNullableType then
1866 v
.error
(self, "Error: isset on a nullable attribute.")
1868 self.mtype
= v
.type_bool
(self)
1872 redef class AVarargExpr
1873 redef fun accept_typing
(v
)
1875 # This kind of pseudo-expression can be only processed trough a signature
1876 # See `check_signature`
1877 # Other cases are a syntax error.
1878 v
.error
(self, "Syntax error: unexpected `...`")
1884 redef class ADebugTypeExpr
1885 redef fun accept_typing
(v
)
1887 var expr
= v
.visit_expr
(self.n_expr
)
1888 if expr
== null then return
1889 var unsafe
= v
.anchor_to
(expr
)
1890 var ntype
= self.n_type
1891 var mtype
= v
.resolve_mtype
(ntype
)
1892 if mtype
!= null and mtype
!= expr
then
1893 var umtype
= v
.anchor_to
(mtype
)
1894 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1896 self.is_typed
= true