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 # Currently only used for `new` factory since there is no valid receiver inside
56 var is_toplevel_context
= false
60 var mpropdef
= self.mpropdef
62 if mpropdef
!= null then
63 self.mpropdef
= mpropdef
64 var mclassdef
= mpropdef
.mclassdef
65 self.mclassdef
= mclassdef
66 self.anchor
= mclassdef
.bound_mtype
68 var mclass
= mclassdef
.mclass
70 var selfvariable
= new Variable("self")
71 self.selfvariable
= selfvariable
72 selfvariable
.declared_type
= mclass
.mclass_type
74 var mprop
= mpropdef
.mproperty
75 if mprop
isa MMethod and mprop
.is_new
then
76 is_toplevel_context
= true
81 fun anchor_to
(mtype
: MType): MType
84 if anchor
== null then
85 assert not mtype
.need_anchor
88 return mtype
.anchor_to
(mmodule
, anchor
)
91 fun is_subtype
(sub
, sup
: MType): Bool
93 return sub
.is_subtype
(mmodule
, anchor
, sup
)
96 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
98 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
99 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
103 # Check that `sub` is a subtype of `sup`.
104 # If `sub` is not a valid suptype, then display an error on `node` an return null.
105 # If `sub` is a safe subtype of `sup` then return `sub`.
106 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
108 # The point of the return type is to determinate the usable type on an expression:
109 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
110 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
111 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
113 if self.is_subtype
(sub
, sup
) then return sub
114 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
115 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
116 #node.debug("Unsafe typing: expected {sup}, got {sub}")
119 if sub
.need_anchor
then
120 var u
= anchor_to
(sub
)
121 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}: {u}")
123 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
128 # Visit an expression and do not care about the return value
129 fun visit_stmt
(nexpr
: nullable AExpr)
131 if nexpr
== null then return
132 nexpr
.accept_typing
(self)
135 # Visit an expression and expects that it is not a statement
136 # Return the type of the expression
137 # Display an error and return null if:
138 # * the type cannot be determined or
139 # * `nexpr` is a statement
140 fun visit_expr
(nexpr
: AExpr): nullable MType
142 nexpr
.accept_typing
(self)
143 var mtype
= nexpr
.mtype
144 if mtype
!= null then return mtype
145 if not nexpr
.is_typed
then
146 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
147 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
148 nexpr
.debug
("No return type but no error.")
151 return null # forward error
153 self.error
(nexpr
, "Type error: expected expression.")
157 # Visit an expression and expect its static type is a least a `sup`
158 # Return the type of the expression or null if
159 # * the type cannot be determined or
160 # * `nexpr` is a statement or
161 # * `nexpr` is not a `sup`
162 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
164 var sub
= visit_expr
(nexpr
)
165 if sub
== null then return null # Forward error
167 if sup
== null then return null # Forward error
169 var res
= check_subtype
(nexpr
, sub
, sup
)
171 nexpr
.implicit_cast_to
= res
176 # Visit an expression and expect its static type is a `Bool`
177 # Return the type of the expression or null if
178 # * the type cannot be determined or
179 # * `nexpr` is a statement or
180 # * `nexpr` is not a `Bool`
181 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
183 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
187 fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
189 var sub
= visit_expr
(nexpr
)
190 if sub
== null then return null # Forward error
192 var sup
= self.resolve_mtype
(ntype
)
193 if sup
== null then return null # Forward error
196 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup}.")
197 else if self.is_subtype
(sub
, sup
) then
198 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup} since it is a {sub}.")
203 # Can `mtype` be null (up to the current knowledge)?
204 fun can_be_null
(mtype
: MType): Bool
206 if mtype
isa MNullableType or mtype
isa MNullType then return true
207 if mtype
isa MFormalType then
208 var x
= anchor_to
(mtype
)
209 if x
isa MNullableType or x
isa MNullType then return true
214 # Check that `mtype` can be null (up to the current knowledge).
216 # If not then display a `useless-null-test` warning on node and return false.
218 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
220 if can_be_null
(mtype
) then return true
222 if mtype
isa MFormalType then
223 var res
= anchor_to
(mtype
)
224 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
226 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
231 # Special verification on != and == for null
233 fun null_test
(anode
: ABinopExpr)
235 var mtype
= anode
.n_expr
.mtype
236 var mtype2
= anode
.n_expr2
.mtype
238 if mtype
== null or mtype2
== null then return
240 if not mtype2
isa MNullType then return
242 if mtype
isa MNullType then return
244 # Check of useless null
245 if not check_can_be_null
(anode
.n_expr
, mtype
) then return
247 mtype
= mtype
.as_notnull
249 # Check for type adaptation
250 var variable
= anode
.n_expr
.its_variable
251 if variable
== null then return
253 # One is null (mtype2 see above) the other is not null
254 if anode
isa AEqExpr then
255 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
256 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
)
257 else if anode
isa ANeExpr then
258 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
259 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
)
265 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
267 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
270 fun resolve_mtype
(node
: AType): nullable MType
272 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
275 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
277 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
281 fun get_mclass
(node
: ANode, name
: String): nullable MClass
283 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
287 fun type_bool
(node
: ANode): nullable MType
289 var mclass
= self.get_mclass
(node
, "Bool")
290 if mclass
== null then return null
291 return mclass
.mclass_type
294 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
296 var unsafe_type
= self.anchor_to
(recvtype
)
298 #debug("recv: {recvtype} (aka {unsafe_type})")
299 if recvtype
isa MNullType then
300 # `null` only accepts some methods of object.
301 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
302 var objclass
= get_mclass
(node
, "Object")
303 if objclass
== null then return null # Forward error
304 unsafe_type
= objclass
.mclass_type
306 self.error
(node
, "Error: Method '{name}' call on 'null'.")
311 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
312 if name
== "new" and mproperty
== null then
314 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
317 if mproperty
== null then
318 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
320 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
322 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
327 assert mproperty
isa MMethod
329 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
330 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
332 if not recv_is_self
and mproperty
.is_toplevel
then
333 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
336 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
337 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
341 var info
= mproperty
.deprecation
342 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
345 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
347 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
351 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
353 if propdefs
.length
== 0 then
354 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
356 else if propdefs
.length
== 1 then
357 mpropdef
= propdefs
.first
359 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
360 mpropdef
= mproperty
.intro
364 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
365 if msignature
== null then return null # skip error
366 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
368 var erasure_cast
= false
369 var rettype
= mpropdef
.msignature
.return_mtype
370 if not recv_is_self
and rettype
!= null then
371 rettype
= rettype
.undecorate
372 if rettype
isa MParameterType then
373 var erased_rettype
= msignature
.return_mtype
374 assert erased_rettype
!= null
375 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
380 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
384 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
386 var unsafe_type
= self.anchor_to
(recvtype
)
387 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
388 if mproperty
== null then return null
389 return get_method
(node
, recvtype
, name
, recv_is_self
)
393 # Visit the expressions of args and check their conformity with the corresponding type in signature
394 # The point of this method is to handle varargs correctly
395 # Note: The signature must be correctly adapted
396 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
398 var vararg_rank
= msignature
.vararg_rank
399 if vararg_rank
>= 0 then
400 if args
.length
< msignature
.arity
then
401 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
402 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
405 else if args
.length
!= msignature
.arity
then
406 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
410 #debug("CALL {unsafe_type}.{msignature}")
412 var vararg_decl
= args
.length
- msignature
.arity
413 for i
in [0..msignature
.arity
[ do
415 if i
== vararg_rank
then continue # skip the vararg
416 if i
> vararg_rank
then
419 var paramtype
= msignature
.mparameters
[i
].mtype
420 self.visit_expr_subtype
(args
[j
], paramtype
)
422 if vararg_rank
>= 0 then
423 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
424 var first
= args
[vararg_rank
]
425 if vararg_decl
== 0 and first
isa AVarargExpr then
426 var mclass
= get_mclass
(node
, "Array")
427 if mclass
== null then return false # Forward error
428 var array_mtype
= mclass
.get_mtype
([paramtype
])
429 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
430 first
.mtype
= first
.n_expr
.mtype
432 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
433 self.visit_expr_subtype
(args
[j
], paramtype
)
440 fun error
(node
: ANode, message
: String)
442 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
445 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
447 var flow
= node
.after_flow_context
449 self.error
(node
, "No context!")
453 if flow
.vars
.has_key
(variable
) then
454 return flow
.vars
[variable
]
456 #node.debug("*** START Collected for {variable}")
457 var mtypes
= flow
.collect_types
(variable
)
458 #node.debug("**** END Collected for {variable}")
459 if mtypes
== null or mtypes
.length
== 0 then
460 return variable
.declared_type
461 else if mtypes
.length
== 1 then
464 var res
= merge_types
(node
,mtypes
)
465 if res
== null then res
= variable
.declared_type
471 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
473 var flow
= node
.after_flow_context
476 flow
.set_var
(variable
, mtype
)
479 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
481 if col
.length
== 1 then return col
.first
483 if t1
== null then continue # return null
486 if t2
== null then continue # return null
487 if can_be_null
(t2
) and not can_be_null
(t1
) then
490 if not is_subtype
(t2
, t1
) then found
= false
493 #print "merge {col.join(" ")} -> {t1}"
497 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
502 # A specific method call site with its associated informations.
504 # The associated node for location
507 # The static type of the receiver (possibly unresolved)
510 # The module where the callsite is present
513 # The anchor to use with `recv` or `msignature`
514 var anchor
: nullable MClassType
516 # Is the receiver self?
517 # If "for_self", virtual types of the signature are kept
518 # If "not_for_self", virtual type are erased
519 var recv_is_self
: Bool
521 # The designated method
522 var mproperty
: MMethod
524 # The statically designated method definition
525 # The most specif one, it is.
526 var mpropdef
: MMethodDef
528 # The resolved signature for the receiver
529 var msignature
: MSignature
531 # Is a implicit cast required on erasure typing policy?
532 var erasure_cast
: Bool
534 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
536 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
541 # The declared type of the variable
542 var declared_type
: nullable MType
545 redef class FlowContext
546 # Store changes of types because of type evolution
547 private var vars
= new HashMap[Variable, nullable MType]
548 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
550 # Adapt the variable to a static type
551 # Warning1: do not modify vars directly.
552 # Warning2: sub-flow may have cached a unadapted variable
553 private fun set_var
(variable
: Variable, mtype
: nullable MType)
555 self.vars
[variable
] = mtype
556 self.cache
.keys
.remove
(variable
)
559 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
561 if cache
.has_key
(variable
) then
562 return cache
[variable
]
564 var res
: nullable Array[nullable MType] = null
565 if vars
.has_key
(variable
) then
566 var mtype
= vars
[variable
]
568 else if self.previous
.is_empty
then
570 res
= [variable
.declared_type
]
572 for flow
in self.previous
do
573 if flow
.is_unreachable
then continue
574 var r2
= flow
.collect_types
(variable
)
575 if r2
== null then continue
580 if not res
.has
(t
) then res
.add
(t
)
585 cache
[variable
] = res
591 # The entry point of the whole typing analysis
592 fun do_typing
(modelbuilder
: ModelBuilder)
596 # The variable associated to the receiver (if any)
597 var selfvariable
: nullable Variable
600 redef class AMethPropdef
601 redef fun do_typing
(modelbuilder
: ModelBuilder)
603 var nblock
= self.n_block
604 if nblock
== null 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 mmethoddef
= self.mpropdef
.as(not null)
613 var msignature
= mmethoddef
.msignature
614 if msignature
== null then return # skip error
615 for i
in [0..msignature
.arity
[ do
616 var mtype
= msignature
.mparameters
[i
].mtype
617 if msignature
.vararg_rank
== i
then
618 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
619 if arrayclass
== null then return # Skip error
620 mtype
= arrayclass
.get_mtype
([mtype
])
622 var variable
= self.n_signature
.n_params
[i
].variable
623 assert variable
!= null
624 variable
.declared_type
= mtype
628 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
629 # We reach the end of the function without having a return, it is bad
630 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
635 redef class AAttrPropdef
636 redef fun do_typing
(modelbuilder
: ModelBuilder)
638 if not has_value
then return
640 var mpropdef
= self.mpropdef
641 if mpropdef
== null then return # skip error
643 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
644 self.selfvariable
= v
.selfvariable
646 var nexpr
= self.n_expr
647 if nexpr
!= null then
648 var mtype
= self.mpropdef
.static_mtype
649 v
.visit_expr_subtype
(nexpr
, mtype
)
651 var nblock
= self.n_block
652 if nblock
!= null then
654 if not nblock
.after_flow_context
.is_unreachable
then
655 # We reach the end of the init without having a return, it is bad
656 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
665 # The static type of the expression.
666 # null if self is a statement or in case of error
667 var mtype
: nullable MType = null
669 # Is the statement correctly typed?
670 # Used to distinguish errors and statements when `mtype == null`
671 var is_typed
: Bool = false
673 # If required, the following implicit cast `.as(XXX)`
674 # Such a cast may by required after evaluating the expression when
675 # a unsafe operation is detected (silently accepted by the Nit language).
676 # The attribute is computed by `check_subtype`
677 var implicit_cast_to
: nullable MType = null
679 # Return the variable read (if any)
680 # Used to perform adaptive typing
681 fun its_variable
: nullable Variable do return null
683 private fun accept_typing
(v
: TypeVisitor)
685 v
.error
(self, "no implemented accept_typing for {self.class_name}")
688 # Is non-null if `self` is a leaf of a comprehension array construction.
689 # In this case, the enclosing literal array node is designated.
690 # The result of the evaluation of `self` must be
691 # stored inside the designated array (there is an implicit `push`)
692 var comprehension
: nullable AArrayExpr = null
695 redef class ABlockExpr
696 redef fun accept_typing
(v
)
698 for e
in self.n_expr
do v
.visit_stmt
(e
)
702 # The type of a blockexpr is the one of the last expression (or null if empty)
705 if self.n_expr
.is_empty
then return null
706 return self.n_expr
.last
.mtype
710 redef class AVardeclExpr
711 redef fun accept_typing
(v
)
713 var variable
= self.variable
714 if variable
== null then return # Skip error
716 var ntype
= self.n_type
717 var mtype
: nullable MType
718 if ntype
== null then
721 mtype
= v
.resolve_mtype
(ntype
)
722 if mtype
== null then return # Skip error
725 var nexpr
= self.n_expr
726 if nexpr
!= null then
727 if mtype
!= null then
728 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
729 if etype
== mtype
then
731 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
734 mtype
= v
.visit_expr
(nexpr
)
735 if mtype
== null then return # Skip error
740 if mtype
== null or mtype
isa MNullType then
741 var objclass
= v
.get_mclass
(self, "Object")
742 if objclass
== null then return # skip error
743 decltype
= objclass
.mclass_type
.as_nullable
744 if mtype
== null then mtype
= decltype
747 variable
.declared_type
= decltype
748 v
.set_variable
(self, variable
, mtype
)
750 #debug("var {variable}: {mtype}")
757 redef fun its_variable
do return self.variable
758 redef fun accept_typing
(v
)
760 var variable
= self.variable
761 if variable
== null then return # Skip error
763 var mtype
= v
.get_variable
(self, variable
)
764 if mtype
!= null then
765 #debug("{variable} is {mtype}")
767 #debug("{variable} is untyped")
774 redef class AVarAssignExpr
775 redef fun accept_typing
(v
)
777 var variable
= self.variable
778 assert variable
!= null
780 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
782 v
.set_variable
(self, variable
, mtype
)
788 redef class AReassignFormExpr
789 # The method designed by the reassign operator.
790 var reassign_callsite
: nullable CallSite
792 var read_type
: nullable MType = null
794 # Determine the `reassign_property`
795 # `readtype` is the type of the reading of the left value.
796 # `writetype` is the type of the writing of the left value.
797 # (Because of `ACallReassignExpr`, both can be different.
798 # Return the static type of the value to store.
799 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
801 var reassign_name
: String
802 if self.n_assign_op
isa APlusAssignOp then
804 else if self.n_assign_op
isa AMinusAssignOp then
810 self.read_type
= readtype
812 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
813 if callsite
== null then return null # Skip error
814 self.reassign_callsite
= callsite
816 var msignature
= callsite
.msignature
817 var rettype
= msignature
.return_mtype
818 assert msignature
.arity
== 1 and rettype
!= null
820 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
821 if value_type
== null then return null # Skip error
823 v
.check_subtype
(self, rettype
, writetype
)
828 redef class AVarReassignExpr
829 redef fun accept_typing
(v
)
831 var variable
= self.variable
832 assert variable
!= null
834 var readtype
= v
.get_variable
(self, variable
)
835 if readtype
== null then return
839 var writetype
= variable
.declared_type
840 if writetype
== null then return
842 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
844 v
.set_variable
(self, variable
, rettype
)
851 redef class AContinueExpr
852 redef fun accept_typing
(v
)
854 var nexpr
= self.n_expr
855 if nexpr
!= null then
862 redef class ABreakExpr
863 redef fun accept_typing
(v
)
865 var nexpr
= self.n_expr
866 if nexpr
!= null then
873 redef class AReturnExpr
874 redef fun accept_typing
(v
)
876 var nexpr
= self.n_expr
878 var mpropdef
= v
.mpropdef
879 if mpropdef
isa MMethodDef then
880 ret_type
= mpropdef
.msignature
.return_mtype
881 else if mpropdef
isa MAttributeDef then
882 ret_type
= mpropdef
.static_mtype
886 if nexpr
!= null then
887 if ret_type
!= null then
888 v
.visit_expr_subtype
(nexpr
, ret_type
)
891 v
.error
(self, "Error: Return with value in a procedure.")
893 else if ret_type
!= null then
894 v
.error
(self, "Error: Return without value in a function.")
900 redef class AAbortExpr
901 redef fun accept_typing
(v
)
908 redef fun accept_typing
(v
)
910 v
.visit_expr_bool
(n_expr
)
917 if n_then
!= null and n_else
== null then
918 self.mtype
= n_then
.mtype
923 redef class AIfexprExpr
924 redef fun accept_typing
(v
)
926 v
.visit_expr_bool
(n_expr
)
928 var t1
= v
.visit_expr
(n_then
)
929 var t2
= v
.visit_expr
(n_else
)
931 if t1
== null or t2
== null then
935 var t
= v
.merge_types
(self, [t1
, t2
])
937 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
944 redef fun accept_typing
(v
)
946 v
.visit_stmt
(n_block
)
951 redef class AWhileExpr
952 redef fun accept_typing
(v
)
954 v
.visit_expr_bool
(n_expr
)
956 v
.visit_stmt
(n_block
)
961 redef class ALoopExpr
962 redef fun accept_typing
(v
)
964 v
.visit_stmt
(n_block
)
970 var coltype
: nullable MClassType
972 var method_iterator
: nullable CallSite
973 var method_is_ok
: nullable CallSite
974 var method_item
: nullable CallSite
975 var method_next
: nullable CallSite
976 var method_key
: nullable CallSite
977 var method_finish
: nullable CallSite
979 var method_lt
: nullable CallSite
980 var method_successor
: nullable CallSite
982 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
984 if mtype
isa MNullType then
985 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
990 var objcla
= v
.get_mclass
(self, "Object")
991 if objcla
== null then return
993 # check iterator method
994 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
995 if itdef
== null then
996 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
999 self.method_iterator
= itdef
1001 # check that iterator return something
1002 var ittype
= itdef
.msignature
.return_mtype
1003 if ittype
== null then
1004 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1009 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1010 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1014 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1016 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1017 var variables
= self.variables
1018 if variables
.length
!= 1 then
1019 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
1021 variables
.first
.declared_type
= coltype
.arguments
.first
1026 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1028 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1029 var variables
= self.variables
1030 if variables
.length
!= 2 then
1031 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
1033 variables
[0].declared_type
= coltype
.arguments
[0]
1034 variables
[1].declared_type
= coltype
.arguments
[1]
1039 if not is_col
and not is_map
then
1040 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1044 # anchor formal and virtual types
1045 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1047 mtype
= mtype
.undecorate
1048 self.coltype
= mtype
.as(MClassType)
1050 # get methods is_ok, next, item
1051 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1052 if ikdef
== null then
1053 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1056 self.method_is_ok
= ikdef
1058 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1059 if itemdef
== null then
1060 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1063 self.method_item
= itemdef
1065 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1066 if nextdef
== null then
1067 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1070 self.method_next
= nextdef
1072 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1075 var keydef
= v
.get_method
(self, ittype
, "key", false)
1076 if keydef
== null then
1077 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1080 self.method_key
= keydef
1083 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1084 var variable
= variables
.first
1085 var vtype
= variable
.declared_type
.as(not null)
1087 if n_expr
isa AOrangeExpr then
1088 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1090 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1093 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1097 redef fun accept_typing
(v
)
1099 var mtype
= v
.visit_expr
(n_expr
)
1100 if mtype
== null then return
1102 self.do_type_iterator
(v
, mtype
)
1104 v
.visit_stmt
(n_block
)
1105 self.mtype
= n_block
.mtype
1106 self.is_typed
= true
1110 redef class AAssertExpr
1111 redef fun accept_typing
(v
)
1113 v
.visit_expr_bool
(n_expr
)
1115 v
.visit_stmt
(n_else
)
1116 self.is_typed
= true
1121 redef fun accept_typing
(v
)
1123 v
.visit_expr_bool
(n_expr
)
1124 v
.visit_expr_bool
(n_expr2
)
1125 self.mtype
= v
.type_bool
(self)
1129 redef class AImpliesExpr
1130 redef fun accept_typing
(v
)
1132 v
.visit_expr_bool
(n_expr
)
1133 v
.visit_expr_bool
(n_expr2
)
1134 self.mtype
= v
.type_bool
(self)
1138 redef class AAndExpr
1139 redef fun accept_typing
(v
)
1141 v
.visit_expr_bool
(n_expr
)
1142 v
.visit_expr_bool
(n_expr2
)
1143 self.mtype
= v
.type_bool
(self)
1148 redef class ANotExpr
1149 redef fun accept_typing
(v
)
1151 v
.visit_expr_bool
(n_expr
)
1152 self.mtype
= v
.type_bool
(self)
1156 redef class AOrElseExpr
1157 redef fun accept_typing
(v
)
1159 var t1
= v
.visit_expr
(n_expr
)
1160 var t2
= v
.visit_expr
(n_expr2
)
1162 if t1
== null or t2
== null then
1166 if t1
isa MNullType then
1167 v
.error
(n_expr
, "Type error: or else on null")
1168 else if v
.check_can_be_null
(n_expr
, t1
) then
1172 var t
= v
.merge_types
(self, [t1
, t2
])
1174 var c
= v
.get_mclass
(self, "Object")
1175 if c
== null then return # forward error
1177 if v
.can_be_null
(t2
) then
1180 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1186 redef class ATrueExpr
1187 redef fun accept_typing
(v
)
1189 self.mtype
= v
.type_bool
(self)
1193 redef class AFalseExpr
1194 redef fun accept_typing
(v
)
1196 self.mtype
= v
.type_bool
(self)
1200 redef class AIntExpr
1201 redef fun accept_typing
(v
)
1203 var mclass
= v
.get_mclass
(self, "Int")
1204 if mclass
== null then return # Forward error
1205 self.mtype
= mclass
.mclass_type
1209 redef class AFloatExpr
1210 redef fun accept_typing
(v
)
1212 var mclass
= v
.get_mclass
(self, "Float")
1213 if mclass
== null then return # Forward error
1214 self.mtype
= mclass
.mclass_type
1218 redef class ACharExpr
1219 redef fun accept_typing
(v
)
1221 var mclass
= v
.get_mclass
(self, "Char")
1222 if mclass
== null then return # Forward error
1223 self.mtype
= mclass
.mclass_type
1227 redef class AStringFormExpr
1228 redef fun accept_typing
(v
)
1230 var mclass
= v
.get_mclass
(self, "String")
1231 if mclass
== null then return # Forward error
1232 self.mtype
= mclass
.mclass_type
1236 redef class ASuperstringExpr
1237 redef fun accept_typing
(v
)
1239 var mclass
= v
.get_mclass
(self, "String")
1240 if mclass
== null then return # Forward error
1241 self.mtype
= mclass
.mclass_type
1242 var objclass
= v
.get_mclass
(self, "Object")
1243 if objclass
== null then return # Forward error
1244 var objtype
= objclass
.mclass_type
1245 for nexpr
in self.n_exprs
do
1246 v
.visit_expr_subtype
(nexpr
, objtype
)
1251 redef class AArrayExpr
1252 # The `with_capacity` method on Array
1253 var with_capacity_callsite
: nullable CallSite
1255 # The `push` method on arrays
1256 var push_callsite
: nullable CallSite
1258 # The element of each type
1259 var element_mtype
: nullable MType
1261 # Set that `self` is a part of comprehension array `na`
1262 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1263 private fun set_comprehension
(n
: nullable AExpr)
1267 else if n
isa AForExpr then
1268 set_comprehension
(n
.n_block
)
1269 else if n
isa AIfExpr then
1270 set_comprehension
(n
.n_then
)
1271 set_comprehension
(n
.n_else
)
1274 n
.comprehension
= self
1277 redef fun accept_typing
(v
)
1279 var mtype
: nullable MType = null
1280 var ntype
= self.n_type
1281 if ntype
!= null then
1282 mtype
= v
.resolve_mtype
(ntype
)
1283 if mtype
== null then return # Skip error
1285 var mtypes
= new Array[nullable MType]
1287 for e
in self.n_exprs
do
1288 var t
= v
.visit_expr
(e
)
1292 set_comprehension
(e
)
1293 if mtype
!= null then
1294 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1295 if t
== mtype
then useless
= true
1300 if mtype
== null then
1301 mtype
= v
.merge_types
(self, mtypes
)
1303 if mtype
== null or mtype
isa MNullType then
1304 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1308 assert ntype
!= null
1309 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1312 self.element_mtype
= mtype
1314 var mclass
= v
.get_mclass
(self, "Array")
1315 if mclass
== null then return # Forward error
1316 var array_mtype
= mclass
.get_mtype
([mtype
])
1318 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1319 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1321 self.mtype
= array_mtype
1325 redef class ARangeExpr
1326 var init_callsite
: nullable CallSite
1328 redef fun accept_typing
(v
)
1330 var discrete_class
= v
.get_mclass
(self, "Discrete")
1331 if discrete_class
== null then return # Forward error
1332 var discrete_type
= discrete_class
.intro
.bound_mtype
1333 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1334 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1335 if t1
== null or t2
== null then return
1336 var mclass
= v
.get_mclass
(self, "Range")
1337 if mclass
== null then return # Forward error
1339 if v
.is_subtype
(t1
, t2
) then
1340 mtype
= mclass
.get_mtype
([t2
])
1341 else if v
.is_subtype
(t2
, t1
) then
1342 mtype
= mclass
.get_mtype
([t1
])
1344 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1350 # get the constructor
1352 if self isa ACrangeExpr then
1353 callsite
= v
.get_method
(self, mtype
, "init", false)
1354 else if self isa AOrangeExpr then
1355 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1359 init_callsite
= callsite
1363 redef class ANullExpr
1364 redef fun accept_typing
(v
)
1366 self.mtype
= v
.mmodule
.model
.null_type
1370 redef class AIsaExpr
1371 # The static type to cast to.
1372 # (different from the static type of the expression that is `Bool`).
1373 var cast_type
: nullable MType
1374 redef fun accept_typing
(v
)
1376 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1377 self.cast_type
= mtype
1379 var variable
= self.n_expr
.its_variable
1380 if variable
!= null then
1381 #var orig = self.n_expr.mtype
1382 #var from = if orig != null then orig.to_s else "invalid"
1383 #var to = if mtype != null then mtype.to_s else "invalid"
1384 #debug("adapt {variable}: {from} -> {to}")
1385 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1388 self.mtype
= v
.type_bool
(self)
1392 redef class AAsCastExpr
1393 redef fun accept_typing
(v
)
1395 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1399 redef class AAsNotnullExpr
1400 redef fun accept_typing
(v
)
1402 var mtype
= v
.visit_expr
(self.n_expr
)
1403 if mtype
== null then return # Forward error
1405 if mtype
isa MNullType then
1406 v
.error
(self, "Type error: as(not null) on null")
1410 if v
.check_can_be_null
(n_expr
, mtype
) then
1411 mtype
= mtype
.as_notnull
1418 redef class AParExpr
1419 redef fun accept_typing
(v
)
1421 self.mtype
= v
.visit_expr
(self.n_expr
)
1425 redef class AOnceExpr
1426 redef fun accept_typing
(v
)
1428 self.mtype
= v
.visit_expr
(self.n_expr
)
1432 redef class ASelfExpr
1433 redef var its_variable
: nullable Variable
1434 redef fun accept_typing
(v
)
1436 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1437 v
.error
(self, "Error: self cannot be used in top-level method.")
1439 var variable
= v
.selfvariable
1440 self.its_variable
= variable
1441 self.mtype
= v
.get_variable
(self, variable
)
1445 redef class AImplicitSelfExpr
1446 # Is the implicit receiver `sys`?
1448 # By default, the implicit receiver is `self`.
1449 # But when there is not method for `self`, `sys` is used as a fall-back.
1450 # Is this case this flag is set to `true`.
1454 ## MESSAGE SENDING AND PROPERTY
1456 redef class ASendExpr
1457 # The property invoked by the send.
1458 var callsite
: nullable CallSite
1460 redef fun accept_typing
(v
)
1462 var nrecv
= self.n_expr
1463 var recvtype
= v
.visit_expr
(nrecv
)
1464 var name
= self.property_name
1466 if recvtype
== null then return # Forward error
1469 var unsafe_type
= v
.anchor_to
(recvtype
)
1470 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1471 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1472 # Special fall-back search in `sys` when noting found in the implicit receiver.
1473 var sysclass
= v
.try_get_mclass
(self, "Sys")
1474 if sysclass
!= null then
1475 var systype
= sysclass
.mclass_type
1476 mproperty
= v
.try_get_mproperty_by_name2
(self, systype
, name
)
1477 if mproperty
!= null then
1478 callsite
= v
.get_method
(self, systype
, name
, false)
1479 if callsite
== null then return # Forward error
1480 # Update information, we are looking at `sys` now, not `self`
1482 nrecv
.its_variable
= null
1483 nrecv
.mtype
= systype
1488 if callsite
== null then
1489 # If still nothing, just exit
1490 callsite
= v
.get_method
(self, recvtype
, name
, nrecv
isa ASelfExpr)
1491 if callsite
== null then return
1494 self.callsite
= callsite
1495 var msignature
= callsite
.msignature
1497 var args
= compute_raw_arguments
1499 callsite
.check_signature
(v
, args
)
1501 if callsite
.mproperty
.is_init
then
1502 var vmpropdef
= v
.mpropdef
1503 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1504 v
.error
(self, "Can call a init only in another init")
1506 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1507 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1511 var ret
= msignature
.return_mtype
1515 self.is_typed
= true
1519 # The name of the property
1520 # Each subclass simply provide the correct name.
1521 private fun property_name
: String is abstract
1523 # An array of all arguments (excluding self)
1524 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1526 private fun compute_raw_arguments
: Array[AExpr] is abstract
1529 redef class ABinopExpr
1530 redef fun compute_raw_arguments
do return [n_expr2
]
1533 redef fun property_name
do return "=="
1534 redef fun accept_typing
(v
)
1541 redef fun property_name
do return "!="
1542 redef fun accept_typing
(v
)
1549 redef fun property_name
do return "<"
1552 redef fun property_name
do return "<="
1555 redef fun property_name
do return "<<"
1558 redef fun property_name
do return ">"
1561 redef fun property_name
do return ">="
1564 redef fun property_name
do return ">>"
1566 redef class APlusExpr
1567 redef fun property_name
do return "+"
1569 redef class AMinusExpr
1570 redef fun property_name
do return "-"
1572 redef class AStarshipExpr
1573 redef fun property_name
do return "<=>"
1575 redef class AStarExpr
1576 redef fun property_name
do return "*"
1578 redef class AStarstarExpr
1579 redef fun property_name
do return "**"
1581 redef class ASlashExpr
1582 redef fun property_name
do return "/"
1584 redef class APercentExpr
1585 redef fun property_name
do return "%"
1588 redef class AUminusExpr
1589 redef fun property_name
do return "unary -"
1590 redef fun compute_raw_arguments
do return new Array[AExpr]
1594 redef class ACallExpr
1595 redef fun property_name
do return n_id
.text
1596 redef fun compute_raw_arguments
do return n_args
.to_a
1599 redef class ACallAssignExpr
1600 redef fun property_name
do return n_id
.text
+ "="
1601 redef fun compute_raw_arguments
1603 var res
= n_args
.to_a
1609 redef class ABraExpr
1610 redef fun property_name
do return "[]"
1611 redef fun compute_raw_arguments
do return n_args
.to_a
1614 redef class ABraAssignExpr
1615 redef fun property_name
do return "[]="
1616 redef fun compute_raw_arguments
1618 var res
= n_args
.to_a
1624 redef class ASendReassignFormExpr
1625 # The property invoked for the writing
1626 var write_callsite
: nullable CallSite
1628 redef fun accept_typing
(v
)
1630 var recvtype
= v
.visit_expr
(self.n_expr
)
1631 var name
= self.property_name
1633 if recvtype
== null then return # Forward error
1635 var for_self
= self.n_expr
isa ASelfExpr
1636 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1638 if callsite
== null then return
1639 self.callsite
= callsite
1641 var args
= compute_raw_arguments
1643 callsite
.check_signature
(v
, args
)
1645 var readtype
= callsite
.msignature
.return_mtype
1646 if readtype
== null then
1647 v
.error
(self, "Error: {name} is not a function")
1651 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1652 if wcallsite
== null then return
1653 self.write_callsite
= wcallsite
1655 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1656 if wtype
== null then return
1658 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1659 args
.add
(self.n_value
)
1660 wcallsite
.check_signature
(v
, args
)
1662 self.is_typed
= true
1666 redef class ACallReassignExpr
1667 redef fun property_name
do return n_id
.text
1668 redef fun compute_raw_arguments
do return n_args
.to_a
1671 redef class ABraReassignExpr
1672 redef fun property_name
do return "[]"
1673 redef fun compute_raw_arguments
do return n_args
.to_a
1676 redef class AInitExpr
1677 redef fun property_name
do return "init"
1678 redef fun compute_raw_arguments
do return n_args
.to_a
1682 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1687 redef class ASuperExpr
1688 # The method to call if the super is in fact a 'super init call'
1689 # Note: if the super is a normal call-next-method, then this attribute is null
1690 var callsite
: nullable CallSite
1692 # The method to call is the super is a standard `call-next-method` super-call
1693 # Note: if the super is a special super-init-call, then this attribute is null
1694 var mpropdef
: nullable MMethodDef
1696 redef fun accept_typing
(v
)
1698 var anchor
= v
.anchor
1699 assert anchor
!= null
1700 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1701 assert recvtype
!= null
1702 var mproperty
= v
.mpropdef
.mproperty
1703 if not mproperty
isa MMethod then
1704 v
.error
(self, "Error: super only usable in a method")
1707 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1708 if superprops
.length
== 0 then
1709 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1710 process_superinit
(v
)
1713 v
.error
(self, "Error: No super method to call for {mproperty}.")
1716 # FIXME: covariance of return type in linear extension?
1717 var superprop
= superprops
.first
1719 var msignature
= superprop
.msignature
.as(not null)
1720 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1721 var args
= self.n_args
.to_a
1722 if args
.length
> 0 then
1723 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1725 self.mtype
= msignature
.return_mtype
1726 self.is_typed
= true
1727 v
.mpropdef
.has_supercall
= true
1728 mpropdef
= v
.mpropdef
.as(MMethodDef)
1731 private fun process_superinit
(v
: TypeVisitor)
1733 var anchor
= v
.anchor
1734 assert anchor
!= null
1735 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1736 assert recvtype
!= null
1737 var mpropdef
= v
.mpropdef
1738 assert mpropdef
isa MMethodDef
1739 var mproperty
= mpropdef
.mproperty
1740 var superprop
: nullable MMethodDef = null
1741 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1742 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1743 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1744 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1745 if candidate
== null then
1746 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1747 continue # Try next super-class
1749 if superprop
!= null and candidate
.is_root_init
then
1752 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1753 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1756 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1757 if superprop
!= null and superprop
.mproperty
== candidate
then
1758 if superprop
== candidatedefs
.first
then continue
1759 candidatedefs
.add
(superprop
)
1761 if candidatedefs
.length
> 1 then
1762 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1765 superprop
= candidatedefs
.first
1767 if superprop
== null then
1768 v
.error
(self, "Error: No super method to call for {mproperty}.")
1772 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1773 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1775 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1776 self.callsite
= callsite
1778 var args
= self.n_args
.to_a
1779 if args
.length
> 0 then
1780 callsite
.check_signature
(v
, args
)
1782 # Check there is at least enough parameters
1783 if mpropdef
.msignature
.arity
< msignature
.arity
then
1784 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1787 # Check that each needed parameter is conform
1789 for sp
in msignature
.mparameters
do
1790 var p
= mpropdef
.msignature
.mparameters
[i
]
1791 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1792 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1799 self.is_typed
= true
1805 redef class ANewExpr
1806 # The constructor invoked by the new.
1807 var callsite
: nullable CallSite
1809 # The designated type
1810 var recvtype
: nullable MClassType
1812 redef fun accept_typing
(v
)
1814 var recvtype
= v
.resolve_mtype
(self.n_type
)
1815 if recvtype
== null then return
1817 if not recvtype
isa MClassType then
1818 if recvtype
isa MNullableType then
1819 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1822 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1827 self.recvtype
= recvtype
1836 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1837 if callsite
== null then return
1839 if not callsite
.mproperty
.is_new
then
1840 var kind
= recvtype
.mclass
.kind
1841 if kind
!= concrete_kind
then
1842 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1845 self.mtype
= recvtype
1847 self.mtype
= callsite
.msignature
.return_mtype
1848 assert self.mtype
!= null
1851 self.callsite
= callsite
1853 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1854 v
.error
(self, "Error: {name} is not a constructor.")
1858 var args
= n_args
.to_a
1859 callsite
.check_signature
(v
, args
)
1865 redef class AAttrFormExpr
1866 # The attribute acceded.
1867 var mproperty
: nullable MAttribute
1869 # The static type of the attribute.
1870 var attr_type
: nullable MType
1872 # Resolve the attribute acceded.
1873 private fun resolve_property
(v
: TypeVisitor)
1875 var recvtype
= v
.visit_expr
(self.n_expr
)
1876 if recvtype
== null then return # Skip error
1877 var name
= self.n_id
.text
1878 if recvtype
isa MNullType then
1879 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1883 var unsafe_type
= v
.anchor_to
(recvtype
)
1884 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1885 if mproperty
== null then
1886 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1889 assert mproperty
isa MAttribute
1890 self.mproperty
= mproperty
1892 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1893 assert mpropdefs
.length
== 1
1894 var mpropdef
= mpropdefs
.first
1895 var attr_type
= mpropdef
.static_mtype
1896 if attr_type
== null then return # skip error
1897 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1898 self.attr_type
= attr_type
1902 redef class AAttrExpr
1903 redef fun accept_typing
(v
)
1905 self.resolve_property
(v
)
1906 self.mtype
= self.attr_type
1911 redef class AAttrAssignExpr
1912 redef fun accept_typing
(v
)
1914 self.resolve_property
(v
)
1915 var mtype
= self.attr_type
1917 v
.visit_expr_subtype
(self.n_value
, mtype
)
1918 self.is_typed
= true
1922 redef class AAttrReassignExpr
1923 redef fun accept_typing
(v
)
1925 self.resolve_property
(v
)
1926 var mtype
= self.attr_type
1927 if mtype
== null then return # Skip error
1929 self.resolve_reassignment
(v
, mtype
, mtype
)
1931 self.is_typed
= true
1935 redef class AIssetAttrExpr
1936 redef fun accept_typing
(v
)
1938 self.resolve_property
(v
)
1939 var mtype
= self.attr_type
1940 if mtype
== null then return # Skip error
1942 var recvtype
= self.n_expr
.mtype
.as(not null)
1943 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1944 if bound
isa MNullableType then
1945 v
.error
(self, "Error: isset on a nullable attribute.")
1947 self.mtype
= v
.type_bool
(self)
1951 redef class AVarargExpr
1952 redef fun accept_typing
(v
)
1954 # This kind of pseudo-expression can be only processed trough a signature
1955 # See `check_signature`
1956 # Other cases are a syntax error.
1957 v
.error
(self, "Syntax error: unexpected `...`")
1963 redef class ADebugTypeExpr
1964 redef fun accept_typing
(v
)
1966 var expr
= v
.visit_expr
(self.n_expr
)
1967 if expr
== null then return
1968 var unsafe
= v
.anchor_to
(expr
)
1969 var ntype
= self.n_type
1970 var mtype
= v
.resolve_mtype
(ntype
)
1971 if mtype
!= null and mtype
!= expr
then
1972 var umtype
= v
.anchor_to
(mtype
)
1973 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1975 self.is_typed
= true