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 var objclass
= get_mclass
(node
, "Object")
269 if objclass
== null then return null # Forward error
270 unsafe_type
= objclass
.mclass_type
272 self.error
(node
, "Error: Method '{name}' call on 'null'.")
277 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
278 if name
== "new" and mproperty
== null then
280 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
283 if mproperty
== null then
284 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
286 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
288 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
293 assert mproperty
isa MMethod
295 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
296 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
298 if not recv_is_self
and mproperty
.is_toplevel
then
299 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
302 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
303 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
307 var info
= mproperty
.deprecation
308 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
311 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
313 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
317 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
319 if propdefs
.length
== 0 then
320 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
322 else if propdefs
.length
== 1 then
323 mpropdef
= propdefs
.first
325 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
326 mpropdef
= mproperty
.intro
330 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
331 if msignature
== null then return null # skip error
332 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
334 var erasure_cast
= false
335 var rettype
= mpropdef
.msignature
.return_mtype
336 if not recv_is_self
and rettype
!= null then
337 rettype
= rettype
.as_notnullable
338 if rettype
isa MParameterType then
339 var erased_rettype
= msignature
.return_mtype
340 assert erased_rettype
!= null
341 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
346 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
350 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
352 var unsafe_type
= self.anchor_to
(recvtype
)
353 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
354 if mproperty
== null then return null
355 return get_method
(node
, recvtype
, name
, recv_is_self
)
359 # Visit the expressions of args and check their conformity with the corresponding type in signature
360 # The point of this method is to handle varargs correctly
361 # Note: The signature must be correctly adapted
362 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
364 var vararg_rank
= msignature
.vararg_rank
365 if vararg_rank
>= 0 then
366 if args
.length
< msignature
.arity
then
367 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
368 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
371 else if args
.length
!= msignature
.arity
then
372 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
376 #debug("CALL {unsafe_type}.{msignature}")
378 var vararg_decl
= args
.length
- msignature
.arity
379 for i
in [0..msignature
.arity
[ do
381 if i
== vararg_rank
then continue # skip the vararg
382 if i
> vararg_rank
then
385 var paramtype
= msignature
.mparameters
[i
].mtype
386 self.visit_expr_subtype
(args
[j
], paramtype
)
388 if vararg_rank
>= 0 then
389 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
390 var first
= args
[vararg_rank
]
391 if vararg_decl
== 0 and first
isa AVarargExpr then
392 var mclass
= get_mclass
(node
, "Array")
393 if mclass
== null then return false # Forward error
394 var array_mtype
= mclass
.get_mtype
([paramtype
])
395 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
396 first
.mtype
= first
.n_expr
.mtype
398 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
399 self.visit_expr_subtype
(args
[j
], paramtype
)
406 fun error
(node
: ANode, message
: String)
408 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
411 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
413 var flow
= node
.after_flow_context
415 self.error
(node
, "No context!")
419 if flow
.vars
.has_key
(variable
) then
420 return flow
.vars
[variable
]
422 #node.debug("*** START Collected for {variable}")
423 var mtypes
= flow
.collect_types
(variable
)
424 #node.debug("**** END Collected for {variable}")
425 if mtypes
== null or mtypes
.length
== 0 then
426 return variable
.declared_type
427 else if mtypes
.length
== 1 then
430 var res
= merge_types
(node
,mtypes
)
431 if res
== null then res
= variable
.declared_type
437 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
439 var flow
= node
.after_flow_context
442 flow
.set_var
(variable
, mtype
)
445 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
447 if col
.length
== 1 then return col
.first
449 if t1
== null then continue # return null
452 if t2
== null then continue # return null
453 if t2
isa MNullableType or t2
isa MNullType then
456 if not is_subtype
(t2
, t1
) then found
= false
459 #print "merge {col.join(" ")} -> {t1}"
463 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
468 # A specific method call site with its associated informations.
470 # The associated node for location
473 # The static type of the receiver (possibly unresolved)
476 # The module where the callsite is present
479 # The anchor to use with `recv` or `msignature`
480 var anchor
: nullable MClassType
482 # Is the receiver self?
483 # If "for_self", virtual types of the signature are kept
484 # If "not_for_self", virtual type are erased
485 var recv_is_self
: Bool
487 # The designated method
488 var mproperty
: MMethod
490 # The statically designated method definition
491 # The most specif one, it is.
492 var mpropdef
: MMethodDef
494 # The resolved signature for the receiver
495 var msignature
: MSignature
497 # Is a implicit cast required on erasure typing policy?
498 var erasure_cast
: Bool
500 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
502 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
507 # The declared type of the variable
508 var declared_type
: nullable MType
511 redef class FlowContext
512 # Store changes of types because of type evolution
513 private var vars
= new HashMap[Variable, nullable MType]
514 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
516 # Adapt the variable to a static type
517 # Warning1: do not modify vars directly.
518 # Warning2: sub-flow may have cached a unadapted variable
519 private fun set_var
(variable
: Variable, mtype
: nullable MType)
521 self.vars
[variable
] = mtype
522 self.cache
.keys
.remove
(variable
)
525 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
527 if cache
.has_key
(variable
) then
528 return cache
[variable
]
530 var res
: nullable Array[nullable MType] = null
531 if vars
.has_key
(variable
) then
532 var mtype
= vars
[variable
]
534 else if self.previous
.is_empty
then
536 res
= [variable
.declared_type
]
538 for flow
in self.previous
do
539 if flow
.is_unreachable
then continue
540 var r2
= flow
.collect_types
(variable
)
541 if r2
== null then continue
546 if not res
.has
(t
) then res
.add
(t
)
551 cache
[variable
] = res
557 # The entry point of the whole typing analysis
558 fun do_typing
(modelbuilder
: ModelBuilder)
562 # The variable associated to the receiver (if any)
563 var selfvariable
: nullable Variable
566 redef class AMethPropdef
567 redef fun do_typing
(modelbuilder
: ModelBuilder)
569 var nblock
= self.n_block
570 if nblock
== null then return
572 var mpropdef
= self.mpropdef
573 if mpropdef
== null then return # skip error
575 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
576 self.selfvariable
= v
.selfvariable
578 var mmethoddef
= self.mpropdef
.as(not null)
579 var msignature
= mmethoddef
.msignature
580 if msignature
== null then return # skip error
581 for i
in [0..msignature
.arity
[ do
582 var mtype
= msignature
.mparameters
[i
].mtype
583 if msignature
.vararg_rank
== i
then
584 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
585 if arrayclass
== null then return # Skip error
586 mtype
= arrayclass
.get_mtype
([mtype
])
588 var variable
= self.n_signature
.n_params
[i
].variable
589 assert variable
!= null
590 variable
.declared_type
= mtype
594 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
595 # We reach the end of the function without having a return, it is bad
596 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
601 redef class AAttrPropdef
602 redef fun do_typing
(modelbuilder
: ModelBuilder)
604 if not has_value
then return
606 var mpropdef
= self.mpropdef
607 if mpropdef
== null then return # skip error
609 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
610 self.selfvariable
= v
.selfvariable
612 var nexpr
= self.n_expr
613 if nexpr
!= null then
614 var mtype
= self.mpropdef
.static_mtype
615 v
.visit_expr_subtype
(nexpr
, mtype
)
617 var nblock
= self.n_block
618 if nblock
!= null then
620 if not nblock
.after_flow_context
.is_unreachable
then
621 # We reach the end of the init without having a return, it is bad
622 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
631 # The static type of the expression.
632 # null if self is a statement or in case of error
633 var mtype
: nullable MType = null
635 # Is the statement correctly typed?
636 # Used to distinguish errors and statements when `mtype == null`
637 var is_typed
: Bool = false
639 # If required, the following implicit cast `.as(XXX)`
640 # Such a cast may by required after evaluating the expression when
641 # a unsafe operation is detected (silently accepted by the Nit language).
642 # The attribute is computed by `check_subtype`
643 var implicit_cast_to
: nullable MType = null
645 # Return the variable read (if any)
646 # Used to perform adaptive typing
647 fun its_variable
: nullable Variable do return null
649 private fun accept_typing
(v
: TypeVisitor)
651 v
.error
(self, "no implemented accept_typing for {self.class_name}")
654 # Is non-null if `self` is a leaf of a comprehension array construction.
655 # In this case, the enclosing literal array node is designated.
656 # The result of the evaluation of `self` must be
657 # stored inside the designated array (there is an implicit `push`)
658 var comprehension
: nullable AArrayExpr = null
661 redef class ABlockExpr
662 redef fun accept_typing
(v
)
664 for e
in self.n_expr
do v
.visit_stmt
(e
)
668 # The type of a blockexpr is the one of the last expression (or null if empty)
671 if self.n_expr
.is_empty
then return null
672 return self.n_expr
.last
.mtype
676 redef class AVardeclExpr
677 redef fun accept_typing
(v
)
679 var variable
= self.variable
680 if variable
== null then return # Skip error
682 var ntype
= self.n_type
683 var mtype
: nullable MType
684 if ntype
== null then
687 mtype
= v
.resolve_mtype
(ntype
)
688 if mtype
== null then return # Skip error
691 var nexpr
= self.n_expr
692 if nexpr
!= null then
693 if mtype
!= null then
694 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
695 if etype
== mtype
then
697 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
700 mtype
= v
.visit_expr
(nexpr
)
701 if mtype
== null then return # Skip error
706 if mtype
== null or mtype
isa MNullType then
707 var objclass
= v
.get_mclass
(self, "Object")
708 if objclass
== null then return # skip error
709 decltype
= objclass
.mclass_type
.as_nullable
710 if mtype
== null then mtype
= decltype
713 variable
.declared_type
= decltype
714 v
.set_variable
(self, variable
, mtype
)
716 #debug("var {variable}: {mtype}")
723 redef fun its_variable
do return self.variable
724 redef fun accept_typing
(v
)
726 var variable
= self.variable
727 if variable
== null then return # Skip error
729 var mtype
= v
.get_variable
(self, variable
)
730 if mtype
!= null then
731 #debug("{variable} is {mtype}")
733 #debug("{variable} is untyped")
740 redef class AVarAssignExpr
741 redef fun accept_typing
(v
)
743 var variable
= self.variable
744 assert variable
!= null
746 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
748 v
.set_variable
(self, variable
, mtype
)
754 redef class AReassignFormExpr
755 # The method designed by the reassign operator.
756 var reassign_callsite
: nullable CallSite
758 var read_type
: nullable MType = null
760 # Determine the `reassign_property`
761 # `readtype` is the type of the reading of the left value.
762 # `writetype` is the type of the writing of the left value.
763 # (Because of `ACallReassignExpr`, both can be different.
764 # Return the static type of the value to store.
765 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
767 var reassign_name
: String
768 if self.n_assign_op
isa APlusAssignOp then
770 else if self.n_assign_op
isa AMinusAssignOp then
776 self.read_type
= readtype
778 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
779 if callsite
== null then return null # Skip error
780 self.reassign_callsite
= callsite
782 var msignature
= callsite
.msignature
783 var rettype
= msignature
.return_mtype
784 assert msignature
.arity
== 1 and rettype
!= null
786 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
787 if value_type
== null then return null # Skip error
789 v
.check_subtype
(self, rettype
, writetype
)
794 redef class AVarReassignExpr
795 redef fun accept_typing
(v
)
797 var variable
= self.variable
798 assert variable
!= null
800 var readtype
= v
.get_variable
(self, variable
)
801 if readtype
== null then return
805 var writetype
= variable
.declared_type
806 if writetype
== null then return
808 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
810 v
.set_variable
(self, variable
, rettype
)
817 redef class AContinueExpr
818 redef fun accept_typing
(v
)
820 var nexpr
= self.n_expr
821 if nexpr
!= null then
828 redef class ABreakExpr
829 redef fun accept_typing
(v
)
831 var nexpr
= self.n_expr
832 if nexpr
!= null then
839 redef class AReturnExpr
840 redef fun accept_typing
(v
)
842 var nexpr
= self.n_expr
844 var mpropdef
= v
.mpropdef
845 if mpropdef
isa MMethodDef then
846 ret_type
= mpropdef
.msignature
.return_mtype
847 else if mpropdef
isa MAttributeDef then
848 ret_type
= mpropdef
.static_mtype
852 if nexpr
!= null then
853 if ret_type
!= null then
854 v
.visit_expr_subtype
(nexpr
, ret_type
)
857 v
.error
(self, "Error: Return with value in a procedure.")
859 else if ret_type
!= null then
860 v
.error
(self, "Error: Return without value in a function.")
866 redef class AAbortExpr
867 redef fun accept_typing
(v
)
874 redef fun accept_typing
(v
)
876 v
.visit_expr_bool
(n_expr
)
883 if n_then
!= null and n_else
== null then
884 self.mtype
= n_then
.mtype
889 redef class AIfexprExpr
890 redef fun accept_typing
(v
)
892 v
.visit_expr_bool
(n_expr
)
894 var t1
= v
.visit_expr
(n_then
)
895 var t2
= v
.visit_expr
(n_else
)
897 if t1
== null or t2
== null then
901 var t
= v
.merge_types
(self, [t1
, t2
])
903 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
910 redef fun accept_typing
(v
)
912 v
.visit_stmt
(n_block
)
917 redef class AWhileExpr
918 redef fun accept_typing
(v
)
920 v
.visit_expr_bool
(n_expr
)
922 v
.visit_stmt
(n_block
)
927 redef class ALoopExpr
928 redef fun accept_typing
(v
)
930 v
.visit_stmt
(n_block
)
936 var coltype
: nullable MClassType
938 var method_iterator
: nullable CallSite
939 var method_is_ok
: nullable CallSite
940 var method_item
: nullable CallSite
941 var method_next
: nullable CallSite
942 var method_key
: nullable CallSite
943 var method_finish
: nullable CallSite
945 var method_lt
: nullable CallSite
946 var method_successor
: nullable CallSite
948 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
950 if mtype
isa MNullType then
951 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
956 var objcla
= v
.get_mclass
(self, "Object")
957 if objcla
== null then return
959 # check iterator method
960 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
961 if itdef
== null then
962 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
965 self.method_iterator
= itdef
967 # check that iterator return something
968 var ittype
= itdef
.msignature
.return_mtype
969 if ittype
== null then
970 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
975 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
976 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
980 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
982 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
983 var variables
= self.variables
984 if variables
.length
!= 1 then
985 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
987 variables
.first
.declared_type
= coltype
.arguments
.first
992 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
994 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
995 var variables
= self.variables
996 if variables
.length
!= 2 then
997 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
999 variables
[0].declared_type
= coltype
.arguments
[0]
1000 variables
[1].declared_type
= coltype
.arguments
[1]
1005 if not is_col
and not is_map
then
1006 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1010 # anchor formal and virtual types
1011 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1013 mtype
= mtype
.as_notnullable
1014 self.coltype
= mtype
.as(MClassType)
1016 # get methods is_ok, next, item
1017 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1018 if ikdef
== null then
1019 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1022 self.method_is_ok
= ikdef
1024 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1025 if itemdef
== null then
1026 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1029 self.method_item
= itemdef
1031 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1032 if nextdef
== null then
1033 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1036 self.method_next
= nextdef
1038 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1041 var keydef
= v
.get_method
(self, ittype
, "key", false)
1042 if keydef
== null then
1043 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1046 self.method_key
= keydef
1049 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1050 var variable
= variables
.first
1051 var vtype
= variable
.declared_type
.as(not null)
1053 if n_expr
isa AOrangeExpr then
1054 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1056 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1059 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1063 redef fun accept_typing
(v
)
1065 var mtype
= v
.visit_expr
(n_expr
)
1066 if mtype
== null then return
1068 self.do_type_iterator
(v
, mtype
)
1070 v
.visit_stmt
(n_block
)
1071 self.mtype
= n_block
.mtype
1072 self.is_typed
= true
1076 redef class AAssertExpr
1077 redef fun accept_typing
(v
)
1079 v
.visit_expr_bool
(n_expr
)
1081 v
.visit_stmt
(n_else
)
1082 self.is_typed
= true
1087 redef fun accept_typing
(v
)
1089 v
.visit_expr_bool
(n_expr
)
1090 v
.visit_expr_bool
(n_expr2
)
1091 self.mtype
= v
.type_bool
(self)
1095 redef class AImpliesExpr
1096 redef fun accept_typing
(v
)
1098 v
.visit_expr_bool
(n_expr
)
1099 v
.visit_expr_bool
(n_expr2
)
1100 self.mtype
= v
.type_bool
(self)
1104 redef class AAndExpr
1105 redef fun accept_typing
(v
)
1107 v
.visit_expr_bool
(n_expr
)
1108 v
.visit_expr_bool
(n_expr2
)
1109 self.mtype
= v
.type_bool
(self)
1114 redef class ANotExpr
1115 redef fun accept_typing
(v
)
1117 v
.visit_expr_bool
(n_expr
)
1118 self.mtype
= v
.type_bool
(self)
1122 redef class AOrElseExpr
1123 redef fun accept_typing
(v
)
1125 var t1
= v
.visit_expr
(n_expr
)
1126 var t2
= v
.visit_expr
(n_expr2
)
1128 if t1
== null or t2
== null then
1132 t1
= t1
.as_notnullable
1134 var t
= v
.merge_types
(self, [t1
, t2
])
1136 var c
= v
.get_mclass
(self, "Object")
1137 if c
== null then return # forward error
1139 if t2
isa MNullableType then
1142 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1148 redef class ATrueExpr
1149 redef fun accept_typing
(v
)
1151 self.mtype
= v
.type_bool
(self)
1155 redef class AFalseExpr
1156 redef fun accept_typing
(v
)
1158 self.mtype
= v
.type_bool
(self)
1162 redef class AIntExpr
1163 redef fun accept_typing
(v
)
1165 var mclass
= v
.get_mclass
(self, "Int")
1166 if mclass
== null then return # Forward error
1167 self.mtype
= mclass
.mclass_type
1171 redef class AFloatExpr
1172 redef fun accept_typing
(v
)
1174 var mclass
= v
.get_mclass
(self, "Float")
1175 if mclass
== null then return # Forward error
1176 self.mtype
= mclass
.mclass_type
1180 redef class ACharExpr
1181 redef fun accept_typing
(v
)
1183 var mclass
= v
.get_mclass
(self, "Char")
1184 if mclass
== null then return # Forward error
1185 self.mtype
= mclass
.mclass_type
1189 redef class AStringFormExpr
1190 redef fun accept_typing
(v
)
1192 var mclass
= v
.get_mclass
(self, "String")
1193 if mclass
== null then return # Forward error
1194 self.mtype
= mclass
.mclass_type
1198 redef class ASuperstringExpr
1199 redef fun accept_typing
(v
)
1201 var mclass
= v
.get_mclass
(self, "String")
1202 if mclass
== null then return # Forward error
1203 self.mtype
= mclass
.mclass_type
1204 var objclass
= v
.get_mclass
(self, "Object")
1205 if objclass
== null then return # Forward error
1206 var objtype
= objclass
.mclass_type
1207 for nexpr
in self.n_exprs
do
1208 v
.visit_expr_subtype
(nexpr
, objtype
)
1213 redef class AArrayExpr
1214 # The `with_capacity` method on Array
1215 var with_capacity_callsite
: nullable CallSite
1217 # The `push` method on arrays
1218 var push_callsite
: nullable CallSite
1220 # The element of each type
1221 var element_mtype
: nullable MType
1223 # Set that `self` is a part of comprehension array `na`
1224 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1225 private fun set_comprehension
(n
: nullable AExpr)
1229 else if n
isa AForExpr then
1230 set_comprehension
(n
.n_block
)
1231 else if n
isa AIfExpr then
1232 set_comprehension
(n
.n_then
)
1233 set_comprehension
(n
.n_else
)
1236 n
.comprehension
= self
1239 redef fun accept_typing
(v
)
1241 var mtype
: nullable MType = null
1242 var ntype
= self.n_type
1243 if ntype
!= null then
1244 mtype
= v
.resolve_mtype
(ntype
)
1245 if mtype
== null then return # Skip error
1247 var mtypes
= new Array[nullable MType]
1249 for e
in self.n_exprs
do
1250 var t
= v
.visit_expr
(e
)
1254 set_comprehension
(e
)
1255 if mtype
!= null then
1256 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1257 if t
== mtype
then useless
= true
1262 if mtype
== null then
1263 mtype
= v
.merge_types
(self, mtypes
)
1265 if mtype
== null or mtype
isa MNullType then
1266 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1270 assert ntype
!= null
1271 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1274 self.element_mtype
= mtype
1276 var mclass
= v
.get_mclass
(self, "Array")
1277 if mclass
== null then return # Forward error
1278 var array_mtype
= mclass
.get_mtype
([mtype
])
1280 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1281 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1283 self.mtype
= array_mtype
1287 redef class ARangeExpr
1288 var init_callsite
: nullable CallSite
1290 redef fun accept_typing
(v
)
1292 var discrete_class
= v
.get_mclass
(self, "Discrete")
1293 if discrete_class
== null then return # Forward error
1294 var discrete_type
= discrete_class
.intro
.bound_mtype
1295 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1296 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1297 if t1
== null or t2
== null then return
1298 var mclass
= v
.get_mclass
(self, "Range")
1299 if mclass
== null then return # Forward error
1301 if v
.is_subtype
(t1
, t2
) then
1302 mtype
= mclass
.get_mtype
([t2
])
1303 else if v
.is_subtype
(t2
, t1
) then
1304 mtype
= mclass
.get_mtype
([t1
])
1306 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1312 # get the constructor
1314 if self isa ACrangeExpr then
1315 callsite
= v
.get_method
(self, mtype
, "init", false)
1316 else if self isa AOrangeExpr then
1317 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1321 init_callsite
= callsite
1325 redef class ANullExpr
1326 redef fun accept_typing
(v
)
1328 self.mtype
= v
.mmodule
.model
.null_type
1332 redef class AIsaExpr
1333 # The static type to cast to.
1334 # (different from the static type of the expression that is `Bool`).
1335 var cast_type
: nullable MType
1336 redef fun accept_typing
(v
)
1338 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1339 self.cast_type
= mtype
1341 var variable
= self.n_expr
.its_variable
1342 if variable
!= null then
1343 #var orig = self.n_expr.mtype
1344 #var from = if orig != null then orig.to_s else "invalid"
1345 #var to = if mtype != null then mtype.to_s else "invalid"
1346 #debug("adapt {variable}: {from} -> {to}")
1347 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1350 self.mtype
= v
.type_bool
(self)
1354 redef class AAsCastExpr
1355 redef fun accept_typing
(v
)
1357 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1361 redef class AAsNotnullExpr
1362 redef fun accept_typing
(v
)
1364 var mtype
= v
.visit_expr
(self.n_expr
)
1365 if mtype
== null then return # Forward error
1367 if mtype
isa MNullType then
1368 v
.error
(self, "Type error: as(not null) on null")
1371 if mtype
isa MNullableType then
1372 self.mtype
= mtype
.mtype
1377 if mtype
isa MClassType then
1378 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1381 assert mtype
.need_anchor
1382 var u
= v
.anchor_to
(mtype
)
1383 if not u
isa MNullableType then
1384 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1390 redef class AParExpr
1391 redef fun accept_typing
(v
)
1393 self.mtype
= v
.visit_expr
(self.n_expr
)
1397 redef class AOnceExpr
1398 redef fun accept_typing
(v
)
1400 self.mtype
= v
.visit_expr
(self.n_expr
)
1404 redef class ASelfExpr
1405 redef var its_variable
: nullable Variable
1406 redef fun accept_typing
(v
)
1408 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1409 v
.error
(self, "Error: self cannot be used in top-level method.")
1411 var variable
= v
.selfvariable
1412 self.its_variable
= variable
1413 self.mtype
= v
.get_variable
(self, variable
)
1417 ## MESSAGE SENDING AND PROPERTY
1419 redef class ASendExpr
1420 # The property invoked by the send.
1421 var callsite
: nullable CallSite
1423 redef fun accept_typing
(v
)
1425 var recvtype
= v
.visit_expr
(self.n_expr
)
1426 var name
= self.property_name
1428 if recvtype
== null then return # Forward error
1430 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1431 if callsite
== null then return
1432 self.callsite
= callsite
1433 var msignature
= callsite
.msignature
1435 var args
= compute_raw_arguments
1437 callsite
.check_signature
(v
, args
)
1439 if callsite
.mproperty
.is_init
then
1440 var vmpropdef
= v
.mpropdef
1441 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1442 v
.error
(self, "Can call a init only in another init")
1444 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1445 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1449 var ret
= msignature
.return_mtype
1453 self.is_typed
= true
1457 # The name of the property
1458 # Each subclass simply provide the correct name.
1459 private fun property_name
: String is abstract
1461 # An array of all arguments (excluding self)
1462 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1464 private fun compute_raw_arguments
: Array[AExpr] is abstract
1467 redef class ABinopExpr
1468 redef fun compute_raw_arguments
do return [n_expr2
]
1471 redef fun property_name
do return "=="
1472 redef fun accept_typing
(v
)
1479 redef fun property_name
do return "!="
1480 redef fun accept_typing
(v
)
1487 redef fun property_name
do return "<"
1490 redef fun property_name
do return "<="
1493 redef fun property_name
do return "<<"
1496 redef fun property_name
do return ">"
1499 redef fun property_name
do return ">="
1502 redef fun property_name
do return ">>"
1504 redef class APlusExpr
1505 redef fun property_name
do return "+"
1507 redef class AMinusExpr
1508 redef fun property_name
do return "-"
1510 redef class AStarshipExpr
1511 redef fun property_name
do return "<=>"
1513 redef class AStarExpr
1514 redef fun property_name
do return "*"
1516 redef class AStarstarExpr
1517 redef fun property_name
do return "**"
1519 redef class ASlashExpr
1520 redef fun property_name
do return "/"
1522 redef class APercentExpr
1523 redef fun property_name
do return "%"
1526 redef class AUminusExpr
1527 redef fun property_name
do return "unary -"
1528 redef fun compute_raw_arguments
do return new Array[AExpr]
1532 redef class ACallExpr
1533 redef fun property_name
do return n_id
.text
1534 redef fun compute_raw_arguments
do return n_args
.to_a
1537 redef class ACallAssignExpr
1538 redef fun property_name
do return n_id
.text
+ "="
1539 redef fun compute_raw_arguments
1541 var res
= n_args
.to_a
1547 redef class ABraExpr
1548 redef fun property_name
do return "[]"
1549 redef fun compute_raw_arguments
do return n_args
.to_a
1552 redef class ABraAssignExpr
1553 redef fun property_name
do return "[]="
1554 redef fun compute_raw_arguments
1556 var res
= n_args
.to_a
1562 redef class ASendReassignFormExpr
1563 # The property invoked for the writing
1564 var write_callsite
: nullable CallSite
1566 redef fun accept_typing
(v
)
1568 var recvtype
= v
.visit_expr
(self.n_expr
)
1569 var name
= self.property_name
1571 if recvtype
== null then return # Forward error
1573 var for_self
= self.n_expr
isa ASelfExpr
1574 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1576 if callsite
== null then return
1577 self.callsite
= callsite
1579 var args
= compute_raw_arguments
1581 callsite
.check_signature
(v
, args
)
1583 var readtype
= callsite
.msignature
.return_mtype
1584 if readtype
== null then
1585 v
.error
(self, "Error: {name} is not a function")
1589 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1590 if wcallsite
== null then return
1591 self.write_callsite
= wcallsite
1593 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1594 if wtype
== null then return
1596 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1597 args
.add
(self.n_value
)
1598 wcallsite
.check_signature
(v
, args
)
1600 self.is_typed
= true
1604 redef class ACallReassignExpr
1605 redef fun property_name
do return n_id
.text
1606 redef fun compute_raw_arguments
do return n_args
.to_a
1609 redef class ABraReassignExpr
1610 redef fun property_name
do return "[]"
1611 redef fun compute_raw_arguments
do return n_args
.to_a
1614 redef class AInitExpr
1615 redef fun property_name
do return "init"
1616 redef fun compute_raw_arguments
do return n_args
.to_a
1620 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1625 redef class ASuperExpr
1626 # The method to call if the super is in fact a 'super init call'
1627 # Note: if the super is a normal call-next-method, then this attribute is null
1628 var callsite
: nullable CallSite
1630 # The method to call is the super is a standard `call-next-method` super-call
1631 # Note: if the super is a special super-init-call, then this attribute is null
1632 var mpropdef
: nullable MMethodDef
1634 redef fun accept_typing
(v
)
1636 var anchor
= v
.anchor
1637 assert anchor
!= null
1638 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1639 assert recvtype
!= null
1640 var mproperty
= v
.mpropdef
.mproperty
1641 if not mproperty
isa MMethod then
1642 v
.error
(self, "Error: super only usable in a method")
1645 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1646 if superprops
.length
== 0 then
1647 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1648 process_superinit
(v
)
1651 v
.error
(self, "Error: No super method to call for {mproperty}.")
1654 # FIXME: covariance of return type in linear extension?
1655 var superprop
= superprops
.first
1657 var msignature
= superprop
.msignature
.as(not null)
1658 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1659 var args
= self.n_args
.to_a
1660 if args
.length
> 0 then
1661 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1663 self.mtype
= msignature
.return_mtype
1664 self.is_typed
= true
1665 v
.mpropdef
.has_supercall
= true
1666 mpropdef
= v
.mpropdef
.as(MMethodDef)
1669 private fun process_superinit
(v
: TypeVisitor)
1671 var anchor
= v
.anchor
1672 assert anchor
!= null
1673 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1674 assert recvtype
!= null
1675 var mpropdef
= v
.mpropdef
1676 assert mpropdef
isa MMethodDef
1677 var mproperty
= mpropdef
.mproperty
1678 var superprop
: nullable MMethodDef = null
1679 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1680 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1681 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1682 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1683 if candidate
== null then
1684 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1685 continue # Try next super-class
1687 if superprop
!= null and candidate
.is_root_init
then
1690 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1691 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1694 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1695 if superprop
!= null and superprop
.mproperty
== candidate
then
1696 if superprop
== candidatedefs
.first
then continue
1697 candidatedefs
.add
(superprop
)
1699 if candidatedefs
.length
> 1 then
1700 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1703 superprop
= candidatedefs
.first
1705 if superprop
== null then
1706 v
.error
(self, "Error: No super method to call for {mproperty}.")
1710 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1711 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1713 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1714 self.callsite
= callsite
1716 var args
= self.n_args
.to_a
1717 if args
.length
> 0 then
1718 callsite
.check_signature
(v
, args
)
1720 # Check there is at least enough parameters
1721 if mpropdef
.msignature
.arity
< msignature
.arity
then
1722 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1725 # Check that each needed parameter is conform
1727 for sp
in msignature
.mparameters
do
1728 var p
= mpropdef
.msignature
.mparameters
[i
]
1729 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1730 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1737 self.is_typed
= true
1743 redef class ANewExpr
1744 # The constructor invoked by the new.
1745 var callsite
: nullable CallSite
1747 # The designated type
1748 var recvtype
: nullable MClassType
1750 redef fun accept_typing
(v
)
1752 var recvtype
= v
.resolve_mtype
(self.n_type
)
1753 if recvtype
== null then return
1755 if not recvtype
isa MClassType then
1756 if recvtype
isa MNullableType then
1757 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1760 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1765 self.recvtype
= recvtype
1774 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1775 if callsite
== null then return
1777 if not callsite
.mproperty
.is_new
then
1778 var kind
= recvtype
.mclass
.kind
1779 if kind
!= concrete_kind
then
1780 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1783 self.mtype
= recvtype
1785 self.mtype
= callsite
.msignature
.return_mtype
1786 assert self.mtype
!= null
1789 self.callsite
= callsite
1791 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1792 v
.error
(self, "Error: {name} is not a constructor.")
1796 var args
= n_args
.to_a
1797 callsite
.check_signature
(v
, args
)
1803 redef class AAttrFormExpr
1804 # The attribute acceded.
1805 var mproperty
: nullable MAttribute
1807 # The static type of the attribute.
1808 var attr_type
: nullable MType
1810 # Resolve the attribute acceded.
1811 private fun resolve_property
(v
: TypeVisitor)
1813 var recvtype
= v
.visit_expr
(self.n_expr
)
1814 if recvtype
== null then return # Skip error
1815 var name
= self.n_id
.text
1816 if recvtype
isa MNullType then
1817 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1821 var unsafe_type
= v
.anchor_to
(recvtype
)
1822 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1823 if mproperty
== null then
1824 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1827 assert mproperty
isa MAttribute
1828 self.mproperty
= mproperty
1830 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1831 assert mpropdefs
.length
== 1
1832 var mpropdef
= mpropdefs
.first
1833 var attr_type
= mpropdef
.static_mtype
1834 if attr_type
== null then return # skip error
1835 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1836 self.attr_type
= attr_type
1840 redef class AAttrExpr
1841 redef fun accept_typing
(v
)
1843 self.resolve_property
(v
)
1844 self.mtype
= self.attr_type
1849 redef class AAttrAssignExpr
1850 redef fun accept_typing
(v
)
1852 self.resolve_property
(v
)
1853 var mtype
= self.attr_type
1855 v
.visit_expr_subtype
(self.n_value
, mtype
)
1856 self.is_typed
= true
1860 redef class AAttrReassignExpr
1861 redef fun accept_typing
(v
)
1863 self.resolve_property
(v
)
1864 var mtype
= self.attr_type
1865 if mtype
== null then return # Skip error
1867 self.resolve_reassignment
(v
, mtype
, mtype
)
1869 self.is_typed
= true
1873 redef class AIssetAttrExpr
1874 redef fun accept_typing
(v
)
1876 self.resolve_property
(v
)
1877 var mtype
= self.attr_type
1878 if mtype
== null then return # Skip error
1880 var recvtype
= self.n_expr
.mtype
.as(not null)
1881 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1882 if bound
isa MNullableType then
1883 v
.error
(self, "Error: isset on a nullable attribute.")
1885 self.mtype
= v
.type_bool
(self)
1889 redef class AVarargExpr
1890 redef fun accept_typing
(v
)
1892 # This kind of pseudo-expression can be only processed trough a signature
1893 # See `check_signature`
1894 # Other cases are a syntax error.
1895 v
.error
(self, "Syntax error: unexpected `...`")
1901 redef class ADebugTypeExpr
1902 redef fun accept_typing
(v
)
1904 var expr
= v
.visit_expr
(self.n_expr
)
1905 if expr
== null then return
1906 var unsafe
= v
.anchor_to
(expr
)
1907 var ntype
= self.n_type
1908 var mtype
= v
.resolve_mtype
(ntype
)
1909 if mtype
!= null and mtype
!= expr
then
1910 var umtype
= v
.anchor_to
(mtype
)
1911 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1913 self.is_typed
= true