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}")
758 redef fun its_variable
do return self.variable
759 redef fun accept_typing
(v
)
761 var variable
= self.variable
762 if variable
== null then return # Skip error
764 var mtype
= v
.get_variable
(self, variable
)
765 if mtype
!= null then
766 #debug("{variable} is {mtype}")
768 #debug("{variable} is untyped")
775 redef class AVarAssignExpr
776 redef fun accept_typing
(v
)
778 var variable
= self.variable
779 assert variable
!= null
781 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
783 v
.set_variable
(self, variable
, mtype
)
789 redef class AReassignFormExpr
790 # The method designed by the reassign operator.
791 var reassign_callsite
: nullable CallSite
793 var read_type
: nullable MType = null
795 # Determine the `reassign_property`
796 # `readtype` is the type of the reading of the left value.
797 # `writetype` is the type of the writing of the left value.
798 # (Because of `ACallReassignExpr`, both can be different.
799 # Return the static type of the value to store.
800 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
802 var reassign_name
: String
803 if self.n_assign_op
isa APlusAssignOp then
805 else if self.n_assign_op
isa AMinusAssignOp then
811 self.read_type
= readtype
813 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
814 if callsite
== null then return null # Skip error
815 self.reassign_callsite
= callsite
817 var msignature
= callsite
.msignature
818 var rettype
= msignature
.return_mtype
819 assert msignature
.arity
== 1 and rettype
!= null
821 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
822 if value_type
== null then return null # Skip error
824 v
.check_subtype
(self, rettype
, writetype
)
829 redef class AVarReassignExpr
830 redef fun accept_typing
(v
)
832 var variable
= self.variable
833 assert variable
!= null
835 var readtype
= v
.get_variable
(self, variable
)
836 if readtype
== null then return
840 var writetype
= variable
.declared_type
841 if writetype
== null then return
843 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
845 v
.set_variable
(self, variable
, rettype
)
852 redef class AContinueExpr
853 redef fun accept_typing
(v
)
855 var nexpr
= self.n_expr
856 if nexpr
!= null then
863 redef class ABreakExpr
864 redef fun accept_typing
(v
)
866 var nexpr
= self.n_expr
867 if nexpr
!= null then
874 redef class AReturnExpr
875 redef fun accept_typing
(v
)
877 var nexpr
= self.n_expr
879 var mpropdef
= v
.mpropdef
880 if mpropdef
isa MMethodDef then
881 ret_type
= mpropdef
.msignature
.return_mtype
882 else if mpropdef
isa MAttributeDef then
883 ret_type
= mpropdef
.static_mtype
887 if nexpr
!= null then
888 if ret_type
!= null then
889 v
.visit_expr_subtype
(nexpr
, ret_type
)
892 v
.error
(self, "Error: Return with value in a procedure.")
894 else if ret_type
!= null then
895 v
.error
(self, "Error: Return without value in a function.")
901 redef class AAbortExpr
902 redef fun accept_typing
(v
)
909 redef fun accept_typing
(v
)
911 v
.visit_expr_bool
(n_expr
)
918 if n_then
!= null and n_else
== null then
919 self.mtype
= n_then
.mtype
924 redef class AIfexprExpr
925 redef fun accept_typing
(v
)
927 v
.visit_expr_bool
(n_expr
)
929 var t1
= v
.visit_expr
(n_then
)
930 var t2
= v
.visit_expr
(n_else
)
932 if t1
== null or t2
== null then
936 var t
= v
.merge_types
(self, [t1
, t2
])
938 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
945 redef fun accept_typing
(v
)
947 v
.visit_stmt
(n_block
)
952 redef class AWhileExpr
953 redef fun accept_typing
(v
)
955 v
.visit_expr_bool
(n_expr
)
957 v
.visit_stmt
(n_block
)
962 redef class ALoopExpr
963 redef fun accept_typing
(v
)
965 v
.visit_stmt
(n_block
)
971 var coltype
: nullable MClassType
973 var method_iterator
: nullable CallSite
974 var method_is_ok
: nullable CallSite
975 var method_item
: nullable CallSite
976 var method_next
: nullable CallSite
977 var method_key
: nullable CallSite
978 var method_finish
: nullable CallSite
980 var method_lt
: nullable CallSite
981 var method_successor
: nullable CallSite
983 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
985 if mtype
isa MNullType then
986 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
991 var objcla
= v
.get_mclass
(self, "Object")
992 if objcla
== null then return
994 # check iterator method
995 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
996 if itdef
== null then
997 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
1000 self.method_iterator
= itdef
1002 # check that iterator return something
1003 var ittype
= itdef
.msignature
.return_mtype
1004 if ittype
== null then
1005 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1010 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1011 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1015 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1017 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1018 var variables
= self.variables
1019 if variables
.length
!= 1 then
1020 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
1022 variables
.first
.declared_type
= coltype
.arguments
.first
1027 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1029 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1030 var variables
= self.variables
1031 if variables
.length
!= 2 then
1032 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
1034 variables
[0].declared_type
= coltype
.arguments
[0]
1035 variables
[1].declared_type
= coltype
.arguments
[1]
1040 if not is_col
and not is_map
then
1041 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1045 # anchor formal and virtual types
1046 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1048 mtype
= mtype
.undecorate
1049 self.coltype
= mtype
.as(MClassType)
1051 # get methods is_ok, next, item
1052 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1053 if ikdef
== null then
1054 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1057 self.method_is_ok
= ikdef
1059 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1060 if itemdef
== null then
1061 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1064 self.method_item
= itemdef
1066 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1067 if nextdef
== null then
1068 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1071 self.method_next
= nextdef
1073 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1076 var keydef
= v
.get_method
(self, ittype
, "key", false)
1077 if keydef
== null then
1078 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1081 self.method_key
= keydef
1084 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1085 var variable
= variables
.first
1086 var vtype
= variable
.declared_type
.as(not null)
1088 if n_expr
isa AOrangeExpr then
1089 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1091 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1094 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1098 redef fun accept_typing
(v
)
1100 var mtype
= v
.visit_expr
(n_expr
)
1101 if mtype
== null then return
1103 self.do_type_iterator
(v
, mtype
)
1105 v
.visit_stmt
(n_block
)
1106 self.mtype
= n_block
.mtype
1107 self.is_typed
= true
1111 redef class AWithExpr
1112 var method_start
: nullable CallSite
1113 var method_finish
: nullable CallSite
1115 redef fun accept_typing
(v
: TypeVisitor)
1117 var mtype
= v
.visit_expr
(n_expr
)
1118 if mtype
== null then return
1120 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1121 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1123 v
.visit_stmt
(n_block
)
1124 self.mtype
= n_block
.mtype
1125 self.is_typed
= true
1129 redef class AAssertExpr
1130 redef fun accept_typing
(v
)
1132 v
.visit_expr_bool
(n_expr
)
1134 v
.visit_stmt
(n_else
)
1135 self.is_typed
= true
1140 redef fun accept_typing
(v
)
1142 v
.visit_expr_bool
(n_expr
)
1143 v
.visit_expr_bool
(n_expr2
)
1144 self.mtype
= v
.type_bool
(self)
1148 redef class AImpliesExpr
1149 redef fun accept_typing
(v
)
1151 v
.visit_expr_bool
(n_expr
)
1152 v
.visit_expr_bool
(n_expr2
)
1153 self.mtype
= v
.type_bool
(self)
1157 redef class AAndExpr
1158 redef fun accept_typing
(v
)
1160 v
.visit_expr_bool
(n_expr
)
1161 v
.visit_expr_bool
(n_expr2
)
1162 self.mtype
= v
.type_bool
(self)
1167 redef class ANotExpr
1168 redef fun accept_typing
(v
)
1170 v
.visit_expr_bool
(n_expr
)
1171 self.mtype
= v
.type_bool
(self)
1175 redef class AOrElseExpr
1176 redef fun accept_typing
(v
)
1178 var t1
= v
.visit_expr
(n_expr
)
1179 var t2
= v
.visit_expr
(n_expr2
)
1181 if t1
== null or t2
== null then
1185 if t1
isa MNullType then
1186 v
.error
(n_expr
, "Type error: or else on null")
1187 else if v
.check_can_be_null
(n_expr
, t1
) then
1191 var t
= v
.merge_types
(self, [t1
, t2
])
1193 var c
= v
.get_mclass
(self, "Object")
1194 if c
== null then return # forward error
1196 if v
.can_be_null
(t2
) then
1199 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1205 redef class ATrueExpr
1206 redef fun accept_typing
(v
)
1208 self.mtype
= v
.type_bool
(self)
1212 redef class AFalseExpr
1213 redef fun accept_typing
(v
)
1215 self.mtype
= v
.type_bool
(self)
1219 redef class AIntExpr
1220 redef fun accept_typing
(v
)
1222 var mclass
= v
.get_mclass
(self, "Int")
1223 if mclass
== null then return # Forward error
1224 self.mtype
= mclass
.mclass_type
1228 redef class AFloatExpr
1229 redef fun accept_typing
(v
)
1231 var mclass
= v
.get_mclass
(self, "Float")
1232 if mclass
== null then return # Forward error
1233 self.mtype
= mclass
.mclass_type
1237 redef class ACharExpr
1238 redef fun accept_typing
(v
)
1240 var mclass
= v
.get_mclass
(self, "Char")
1241 if mclass
== null then return # Forward error
1242 self.mtype
= mclass
.mclass_type
1246 redef class AStringFormExpr
1247 redef fun accept_typing
(v
)
1249 var mclass
= v
.get_mclass
(self, "String")
1250 if mclass
== null then return # Forward error
1251 self.mtype
= mclass
.mclass_type
1255 redef class ASuperstringExpr
1256 redef fun accept_typing
(v
)
1258 var mclass
= v
.get_mclass
(self, "String")
1259 if mclass
== null then return # Forward error
1260 self.mtype
= mclass
.mclass_type
1261 var objclass
= v
.get_mclass
(self, "Object")
1262 if objclass
== null then return # Forward error
1263 var objtype
= objclass
.mclass_type
1264 for nexpr
in self.n_exprs
do
1265 v
.visit_expr_subtype
(nexpr
, objtype
)
1270 redef class AArrayExpr
1271 # The `with_capacity` method on Array
1272 var with_capacity_callsite
: nullable CallSite
1274 # The `push` method on arrays
1275 var push_callsite
: nullable CallSite
1277 # The element of each type
1278 var element_mtype
: nullable MType
1280 # Set that `self` is a part of comprehension array `na`
1281 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1282 private fun set_comprehension
(n
: nullable AExpr)
1286 else if n
isa AForExpr then
1287 set_comprehension
(n
.n_block
)
1288 else if n
isa AIfExpr then
1289 set_comprehension
(n
.n_then
)
1290 set_comprehension
(n
.n_else
)
1293 n
.comprehension
= self
1296 redef fun accept_typing
(v
)
1298 var mtype
: nullable MType = null
1299 var ntype
= self.n_type
1300 if ntype
!= null then
1301 mtype
= v
.resolve_mtype
(ntype
)
1302 if mtype
== null then return # Skip error
1304 var mtypes
= new Array[nullable MType]
1306 for e
in self.n_exprs
do
1307 var t
= v
.visit_expr
(e
)
1311 set_comprehension
(e
)
1312 if mtype
!= null then
1313 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1314 if t
== mtype
then useless
= true
1319 if mtype
== null then
1320 mtype
= v
.merge_types
(self, mtypes
)
1322 if mtype
== null or mtype
isa MNullType then
1323 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1327 assert ntype
!= null
1328 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1331 self.element_mtype
= mtype
1333 var mclass
= v
.get_mclass
(self, "Array")
1334 if mclass
== null then return # Forward error
1335 var array_mtype
= mclass
.get_mtype
([mtype
])
1337 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1338 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1340 self.mtype
= array_mtype
1344 redef class ARangeExpr
1345 var init_callsite
: nullable CallSite
1347 redef fun accept_typing
(v
)
1349 var discrete_class
= v
.get_mclass
(self, "Discrete")
1350 if discrete_class
== null then return # Forward error
1351 var discrete_type
= discrete_class
.intro
.bound_mtype
1352 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1353 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1354 if t1
== null or t2
== null then return
1355 var mclass
= v
.get_mclass
(self, "Range")
1356 if mclass
== null then return # Forward error
1358 if v
.is_subtype
(t1
, t2
) then
1359 mtype
= mclass
.get_mtype
([t2
])
1360 else if v
.is_subtype
(t2
, t1
) then
1361 mtype
= mclass
.get_mtype
([t1
])
1363 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1369 # get the constructor
1371 if self isa ACrangeExpr then
1372 callsite
= v
.get_method
(self, mtype
, "init", false)
1373 else if self isa AOrangeExpr then
1374 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1378 init_callsite
= callsite
1382 redef class ANullExpr
1383 redef fun accept_typing
(v
)
1385 self.mtype
= v
.mmodule
.model
.null_type
1389 redef class AIsaExpr
1390 # The static type to cast to.
1391 # (different from the static type of the expression that is `Bool`).
1392 var cast_type
: nullable MType
1393 redef fun accept_typing
(v
)
1395 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1396 self.cast_type
= mtype
1398 var variable
= self.n_expr
.its_variable
1399 if variable
!= null then
1400 #var orig = self.n_expr.mtype
1401 #var from = if orig != null then orig.to_s else "invalid"
1402 #var to = if mtype != null then mtype.to_s else "invalid"
1403 #debug("adapt {variable}: {from} -> {to}")
1404 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1407 self.mtype
= v
.type_bool
(self)
1411 redef class AAsCastExpr
1412 redef fun accept_typing
(v
)
1414 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1418 redef class AAsNotnullExpr
1419 redef fun accept_typing
(v
)
1421 var mtype
= v
.visit_expr
(self.n_expr
)
1422 if mtype
== null then return # Forward error
1424 if mtype
isa MNullType then
1425 v
.error
(self, "Type error: as(not null) on null")
1429 if v
.check_can_be_null
(n_expr
, mtype
) then
1430 mtype
= mtype
.as_notnull
1437 redef class AParExpr
1438 redef fun accept_typing
(v
)
1440 self.mtype
= v
.visit_expr
(self.n_expr
)
1444 redef class AOnceExpr
1445 redef fun accept_typing
(v
)
1447 self.mtype
= v
.visit_expr
(self.n_expr
)
1451 redef class ASelfExpr
1452 redef var its_variable
: nullable Variable
1453 redef fun accept_typing
(v
)
1455 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1456 v
.error
(self, "Error: self cannot be used in top-level method.")
1458 var variable
= v
.selfvariable
1459 self.its_variable
= variable
1460 self.mtype
= v
.get_variable
(self, variable
)
1464 redef class AImplicitSelfExpr
1465 # Is the implicit receiver `sys`?
1467 # By default, the implicit receiver is `self`.
1468 # But when there is not method for `self`, `sys` is used as a fall-back.
1469 # Is this case this flag is set to `true`.
1473 ## MESSAGE SENDING AND PROPERTY
1475 redef class ASendExpr
1476 # The property invoked by the send.
1477 var callsite
: nullable CallSite
1479 redef fun accept_typing
(v
)
1481 var nrecv
= self.n_expr
1482 var recvtype
= v
.visit_expr
(nrecv
)
1483 var name
= self.property_name
1485 if recvtype
== null then return # Forward error
1488 var unsafe_type
= v
.anchor_to
(recvtype
)
1489 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1490 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1491 # Special fall-back search in `sys` when noting found in the implicit receiver.
1492 var sysclass
= v
.try_get_mclass
(self, "Sys")
1493 if sysclass
!= null then
1494 var systype
= sysclass
.mclass_type
1495 mproperty
= v
.try_get_mproperty_by_name2
(self, systype
, name
)
1496 if mproperty
!= null then
1497 callsite
= v
.get_method
(self, systype
, name
, false)
1498 if callsite
== null then return # Forward error
1499 # Update information, we are looking at `sys` now, not `self`
1501 nrecv
.its_variable
= null
1502 nrecv
.mtype
= systype
1507 if callsite
== null then
1508 # If still nothing, just exit
1509 callsite
= v
.get_method
(self, recvtype
, name
, nrecv
isa ASelfExpr)
1510 if callsite
== null then return
1513 self.callsite
= callsite
1514 var msignature
= callsite
.msignature
1516 var args
= compute_raw_arguments
1518 callsite
.check_signature
(v
, args
)
1520 if callsite
.mproperty
.is_init
then
1521 var vmpropdef
= v
.mpropdef
1522 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1523 v
.error
(self, "Can call a init only in another init")
1525 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1526 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1530 var ret
= msignature
.return_mtype
1534 self.is_typed
= true
1538 # The name of the property
1539 # Each subclass simply provide the correct name.
1540 private fun property_name
: String is abstract
1542 # An array of all arguments (excluding self)
1543 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1545 private fun compute_raw_arguments
: Array[AExpr] is abstract
1548 redef class ABinopExpr
1549 redef fun compute_raw_arguments
do return [n_expr2
]
1552 redef fun property_name
do return "=="
1553 redef fun accept_typing
(v
)
1560 redef fun property_name
do return "!="
1561 redef fun accept_typing
(v
)
1568 redef fun property_name
do return "<"
1571 redef fun property_name
do return "<="
1574 redef fun property_name
do return "<<"
1577 redef fun property_name
do return ">"
1580 redef fun property_name
do return ">="
1583 redef fun property_name
do return ">>"
1585 redef class APlusExpr
1586 redef fun property_name
do return "+"
1588 redef class AMinusExpr
1589 redef fun property_name
do return "-"
1591 redef class AStarshipExpr
1592 redef fun property_name
do return "<=>"
1594 redef class AStarExpr
1595 redef fun property_name
do return "*"
1597 redef class AStarstarExpr
1598 redef fun property_name
do return "**"
1600 redef class ASlashExpr
1601 redef fun property_name
do return "/"
1603 redef class APercentExpr
1604 redef fun property_name
do return "%"
1607 redef class AUminusExpr
1608 redef fun property_name
do return "unary -"
1609 redef fun compute_raw_arguments
do return new Array[AExpr]
1613 redef class ACallExpr
1614 redef fun property_name
do return n_id
.text
1615 redef fun compute_raw_arguments
do return n_args
.to_a
1618 redef class ACallAssignExpr
1619 redef fun property_name
do return n_id
.text
+ "="
1620 redef fun compute_raw_arguments
1622 var res
= n_args
.to_a
1628 redef class ABraExpr
1629 redef fun property_name
do return "[]"
1630 redef fun compute_raw_arguments
do return n_args
.to_a
1633 redef class ABraAssignExpr
1634 redef fun property_name
do return "[]="
1635 redef fun compute_raw_arguments
1637 var res
= n_args
.to_a
1643 redef class ASendReassignFormExpr
1644 # The property invoked for the writing
1645 var write_callsite
: nullable CallSite
1647 redef fun accept_typing
(v
)
1649 var recvtype
= v
.visit_expr
(self.n_expr
)
1650 var name
= self.property_name
1652 if recvtype
== null then return # Forward error
1654 var for_self
= self.n_expr
isa ASelfExpr
1655 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1657 if callsite
== null then return
1658 self.callsite
= callsite
1660 var args
= compute_raw_arguments
1662 callsite
.check_signature
(v
, args
)
1664 var readtype
= callsite
.msignature
.return_mtype
1665 if readtype
== null then
1666 v
.error
(self, "Error: {name} is not a function")
1670 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1671 if wcallsite
== null then return
1672 self.write_callsite
= wcallsite
1674 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1675 if wtype
== null then return
1677 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1678 args
.add
(self.n_value
)
1679 wcallsite
.check_signature
(v
, args
)
1681 self.is_typed
= true
1685 redef class ACallReassignExpr
1686 redef fun property_name
do return n_id
.text
1687 redef fun compute_raw_arguments
do return n_args
.to_a
1690 redef class ABraReassignExpr
1691 redef fun property_name
do return "[]"
1692 redef fun compute_raw_arguments
do return n_args
.to_a
1695 redef class AInitExpr
1696 redef fun property_name
do return "init"
1697 redef fun compute_raw_arguments
do return n_args
.to_a
1701 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1706 redef class ASuperExpr
1707 # The method to call if the super is in fact a 'super init call'
1708 # Note: if the super is a normal call-next-method, then this attribute is null
1709 var callsite
: nullable CallSite
1711 # The method to call is the super is a standard `call-next-method` super-call
1712 # Note: if the super is a special super-init-call, then this attribute is null
1713 var mpropdef
: nullable MMethodDef
1715 redef fun accept_typing
(v
)
1717 var anchor
= v
.anchor
1718 assert anchor
!= null
1719 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1720 assert recvtype
!= null
1721 var mproperty
= v
.mpropdef
.mproperty
1722 if not mproperty
isa MMethod then
1723 v
.error
(self, "Error: super only usable in a method")
1726 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1727 if superprops
.length
== 0 then
1728 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1729 process_superinit
(v
)
1732 v
.error
(self, "Error: No super method to call for {mproperty}.")
1735 # FIXME: covariance of return type in linear extension?
1736 var superprop
= superprops
.first
1738 var msignature
= superprop
.msignature
.as(not null)
1739 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1740 var args
= self.n_args
.to_a
1741 if args
.length
> 0 then
1742 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1744 self.mtype
= msignature
.return_mtype
1745 self.is_typed
= true
1746 v
.mpropdef
.has_supercall
= true
1747 mpropdef
= v
.mpropdef
.as(MMethodDef)
1750 private fun process_superinit
(v
: TypeVisitor)
1752 var anchor
= v
.anchor
1753 assert anchor
!= null
1754 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1755 assert recvtype
!= null
1756 var mpropdef
= v
.mpropdef
1757 assert mpropdef
isa MMethodDef
1758 var mproperty
= mpropdef
.mproperty
1759 var superprop
: nullable MMethodDef = null
1760 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1761 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1762 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1763 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1764 if candidate
== null then
1765 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1766 continue # Try next super-class
1768 if superprop
!= null and candidate
.is_root_init
then
1771 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1772 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1775 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1776 if superprop
!= null and superprop
.mproperty
== candidate
then
1777 if superprop
== candidatedefs
.first
then continue
1778 candidatedefs
.add
(superprop
)
1780 if candidatedefs
.length
> 1 then
1781 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1784 superprop
= candidatedefs
.first
1786 if superprop
== null then
1787 v
.error
(self, "Error: No super method to call for {mproperty}.")
1791 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1792 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1794 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1795 self.callsite
= callsite
1797 var args
= self.n_args
.to_a
1798 if args
.length
> 0 then
1799 callsite
.check_signature
(v
, args
)
1801 # Check there is at least enough parameters
1802 if mpropdef
.msignature
.arity
< msignature
.arity
then
1803 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1806 # Check that each needed parameter is conform
1808 for sp
in msignature
.mparameters
do
1809 var p
= mpropdef
.msignature
.mparameters
[i
]
1810 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1811 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1818 self.is_typed
= true
1824 redef class ANewExpr
1825 # The constructor invoked by the new.
1826 var callsite
: nullable CallSite
1828 # The designated type
1829 var recvtype
: nullable MClassType
1831 redef fun accept_typing
(v
)
1833 var recvtype
= v
.resolve_mtype
(self.n_type
)
1834 if recvtype
== null then return
1836 if not recvtype
isa MClassType then
1837 if recvtype
isa MNullableType then
1838 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1841 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1846 self.recvtype
= recvtype
1855 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1856 if callsite
== null then return
1858 if not callsite
.mproperty
.is_new
then
1859 var kind
= recvtype
.mclass
.kind
1860 if kind
!= concrete_kind
then
1861 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1864 self.mtype
= recvtype
1866 self.mtype
= callsite
.msignature
.return_mtype
1867 assert self.mtype
!= null
1870 self.callsite
= callsite
1872 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1873 v
.error
(self, "Error: {name} is not a constructor.")
1877 var args
= n_args
.to_a
1878 callsite
.check_signature
(v
, args
)
1884 redef class AAttrFormExpr
1885 # The attribute acceded.
1886 var mproperty
: nullable MAttribute
1888 # The static type of the attribute.
1889 var attr_type
: nullable MType
1891 # Resolve the attribute acceded.
1892 private fun resolve_property
(v
: TypeVisitor)
1894 var recvtype
= v
.visit_expr
(self.n_expr
)
1895 if recvtype
== null then return # Skip error
1896 var name
= self.n_id
.text
1897 if recvtype
isa MNullType then
1898 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1902 var unsafe_type
= v
.anchor_to
(recvtype
)
1903 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1904 if mproperty
== null then
1905 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1908 assert mproperty
isa MAttribute
1909 self.mproperty
= mproperty
1911 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1912 assert mpropdefs
.length
== 1
1913 var mpropdef
= mpropdefs
.first
1914 var attr_type
= mpropdef
.static_mtype
1915 if attr_type
== null then return # skip error
1916 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1917 self.attr_type
= attr_type
1921 redef class AAttrExpr
1922 redef fun accept_typing
(v
)
1924 self.resolve_property
(v
)
1925 self.mtype
= self.attr_type
1930 redef class AAttrAssignExpr
1931 redef fun accept_typing
(v
)
1933 self.resolve_property
(v
)
1934 var mtype
= self.attr_type
1936 v
.visit_expr_subtype
(self.n_value
, mtype
)
1937 self.is_typed
= true
1941 redef class AAttrReassignExpr
1942 redef fun accept_typing
(v
)
1944 self.resolve_property
(v
)
1945 var mtype
= self.attr_type
1946 if mtype
== null then return # Skip error
1948 self.resolve_reassignment
(v
, mtype
, mtype
)
1950 self.is_typed
= true
1954 redef class AIssetAttrExpr
1955 redef fun accept_typing
(v
)
1957 self.resolve_property
(v
)
1958 var mtype
= self.attr_type
1959 if mtype
== null then return # Skip error
1961 var recvtype
= self.n_expr
.mtype
.as(not null)
1962 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1963 if bound
isa MNullableType then
1964 v
.error
(self, "Error: isset on a nullable attribute.")
1966 self.mtype
= v
.type_bool
(self)
1970 redef class AVarargExpr
1971 redef fun accept_typing
(v
)
1973 # This kind of pseudo-expression can be only processed trough a signature
1974 # See `check_signature`
1975 # Other cases are a syntax error.
1976 v
.error
(self, "Syntax error: unexpected `...`")
1982 redef class ADebugTypeExpr
1983 redef fun accept_typing
(v
)
1985 var expr
= v
.visit_expr
(self.n_expr
)
1986 if expr
== null then return
1987 var unsafe
= v
.anchor_to
(expr
)
1988 var ntype
= self.n_type
1989 var mtype
= v
.resolve_mtype
(ntype
)
1990 if mtype
!= null and mtype
!= expr
then
1991 var umtype
= v
.anchor_to
(mtype
)
1992 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1994 self.is_typed
= true