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 # Check of useless null
243 if not check_can_be_null
(anode
.n_expr
, mtype
) then return
245 if mtype
isa MNullType then
246 # Because of type adaptation, we cannot just stop here
247 # so return use `null` as a bottom type that will be merged easily (cf) `merge_types`
250 mtype
= mtype
.as_notnull
253 # Check for type adaptation
254 var variable
= anode
.n_expr
.its_variable
255 if variable
== null then return
257 # One is null (mtype2 see above) the other is not null
258 if anode
isa AEqExpr then
259 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype2
)
260 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype
)
261 else if anode
isa ANeExpr then
262 anode
.after_flow_context
.when_false
.set_var
(self, variable
, mtype2
)
263 anode
.after_flow_context
.when_true
.set_var
(self, variable
, mtype
)
269 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
271 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
274 fun resolve_mtype
(node
: AType): nullable MType
276 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
279 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
281 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
285 fun get_mclass
(node
: ANode, name
: String): nullable MClass
287 var mclass
= modelbuilder
.get_mclass_by_name
(node
, mmodule
, name
)
291 fun type_bool
(node
: ANode): nullable MType
293 var mclass
= self.get_mclass
(node
, "Bool")
294 if mclass
== null then return null
295 return mclass
.mclass_type
298 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
300 var unsafe_type
= self.anchor_to
(recvtype
)
302 #debug("recv: {recvtype} (aka {unsafe_type})")
303 if recvtype
isa MNullType then
304 # `null` only accepts some methods of object.
305 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
306 var objclass
= get_mclass
(node
, "Object")
307 if objclass
== null then return null # Forward error
308 unsafe_type
= objclass
.mclass_type
310 self.error
(node
, "Error: Method '{name}' call on 'null'.")
315 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
316 if name
== "new" and mproperty
== null then
318 mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
321 if mproperty
== null then
322 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
324 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
326 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
331 assert mproperty
isa MMethod
333 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
334 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
336 if not recv_is_self
and mproperty
.is_toplevel
then
337 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
340 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
341 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
345 var info
= mproperty
.deprecation
346 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
349 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
351 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
355 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
357 if propdefs
.length
== 0 then
358 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
360 else if propdefs
.length
== 1 then
361 mpropdef
= propdefs
.first
363 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
364 mpropdef
= mproperty
.intro
368 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
369 if msignature
== null then return null # skip error
370 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
372 var erasure_cast
= false
373 var rettype
= mpropdef
.msignature
.return_mtype
374 if not recv_is_self
and rettype
!= null then
375 rettype
= rettype
.undecorate
376 if rettype
isa MParameterType then
377 var erased_rettype
= msignature
.return_mtype
378 assert erased_rettype
!= null
379 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
384 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
388 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
390 var unsafe_type
= self.anchor_to
(recvtype
)
391 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
392 if mproperty
== null then return null
393 return get_method
(node
, recvtype
, name
, recv_is_self
)
397 # Visit the expressions of args and check their conformity with the corresponding type in signature
398 # The point of this method is to handle varargs correctly
399 # Note: The signature must be correctly adapted
400 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
402 var vararg_rank
= msignature
.vararg_rank
403 if vararg_rank
>= 0 then
404 if args
.length
< msignature
.arity
then
405 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
406 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
409 else if args
.length
!= msignature
.arity
then
410 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
414 #debug("CALL {unsafe_type}.{msignature}")
416 var vararg_decl
= args
.length
- msignature
.arity
417 for i
in [0..msignature
.arity
[ do
419 if i
== vararg_rank
then continue # skip the vararg
420 if i
> vararg_rank
then
423 var paramtype
= msignature
.mparameters
[i
].mtype
424 self.visit_expr_subtype
(args
[j
], paramtype
)
426 if vararg_rank
>= 0 then
427 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
428 var first
= args
[vararg_rank
]
429 if vararg_decl
== 0 and first
isa AVarargExpr then
430 var mclass
= get_mclass
(node
, "Array")
431 if mclass
== null then return false # Forward error
432 var array_mtype
= mclass
.get_mtype
([paramtype
])
433 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
434 first
.mtype
= first
.n_expr
.mtype
436 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
437 self.visit_expr_subtype
(args
[j
], paramtype
)
444 fun error
(node
: ANode, message
: String)
446 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
449 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
451 if not variable
.is_adapted
then return variable
.declared_type
453 var flow
= node
.after_flow_context
455 self.error
(node
, "No context!")
459 if flow
.vars
.has_key
(variable
) then
460 return flow
.vars
[variable
]
462 #node.debug("*** START Collected for {variable}")
463 var mtypes
= flow
.collect_types
(variable
)
464 #node.debug("**** END Collected for {variable}")
465 if mtypes
.length
== 0 then
466 return variable
.declared_type
467 else if mtypes
.length
== 1 then
470 var res
= merge_types
(node
,mtypes
)
471 if res
== null then res
= variable
.declared_type
477 # Some variables where type-adapted during the visit
480 # Some loops had been visited during the visit
483 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
485 var flow
= node
.after_flow_context
488 flow
.set_var
(self, variable
, mtype
)
491 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
493 if col
.length
== 1 then return col
.first
495 if t1
== null then continue # return null
498 if t2
== null then continue # return null
499 if can_be_null
(t2
) and not can_be_null
(t1
) then
502 if not is_subtype
(t2
, t1
) then found
= false
505 #print "merge {col.join(" ")} -> {t1}"
509 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
514 # A specific method call site with its associated informations.
516 # The associated node for location
519 # The static type of the receiver (possibly unresolved)
522 # The module where the callsite is present
525 # The anchor to use with `recv` or `msignature`
526 var anchor
: nullable MClassType
528 # Is the receiver self?
529 # If "for_self", virtual types of the signature are kept
530 # If "not_for_self", virtual type are erased
531 var recv_is_self
: Bool
533 # The designated method
534 var mproperty
: MMethod
536 # The statically designated method definition
537 # The most specif one, it is.
538 var mpropdef
: MMethodDef
540 # The resolved signature for the receiver
541 var msignature
: MSignature
543 # Is a implicit cast required on erasure typing policy?
544 var erasure_cast
: Bool
546 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
548 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
553 # The declared type of the variable
554 var declared_type
: nullable MType
556 # Was the variable type-adapted?
557 # This is used to speedup type retrieval while it remains `false`
558 private var is_adapted
= false
561 redef class FlowContext
562 # Store changes of types because of type evolution
563 private var vars
= new HashMap[Variable, nullable MType]
565 # Adapt the variable to a static type
566 # Warning1: do not modify vars directly.
567 # Warning2: sub-flow may have cached a unadapted variable
568 private fun set_var
(v
: TypeVisitor, variable
: Variable, mtype
: nullable MType)
570 if variable
.declared_type
== mtype
and not variable
.is_adapted
then return
571 if vars
.has_key
(variable
) and vars
[variable
] == mtype
then return
572 self.vars
[variable
] = mtype
574 variable
.is_adapted
= true
575 #node.debug "set {variable} to {mtype or else "X"}"
578 # Look in the flow and previous flow and collect all first reachable type adaptation of a local variable
579 private fun collect_types
(variable
: Variable): Array[nullable MType]
581 #node.debug "flow for {variable}"
582 var res
= new Array[nullable MType]
585 var seen
= new HashSet[FlowContext]
586 while not todo
.is_empty
do
588 if f
.is_unreachable
then continue
589 if seen
.has
(f
) then continue
592 if f
.vars
.has_key
(variable
) then
593 # Found something. Collect it and do not process further on this path
594 res
.add f
.vars
[variable
]
595 #f.node.debug "process {variable}: got {f.vars[variable] or else "X"}"
597 todo
.add_all f
.previous
599 if f
.previous
.is_empty
then
600 # Root flowcontext mean a parameter or something related
601 res
.add variable
.declared_type
602 #f.node.debug "root process {variable}: got {variable.declared_type or else "X"}"
606 #self.node.debug "##### end flow for {variable}: {res.join(" ")}"
612 # The entry point of the whole typing analysis
613 fun do_typing
(modelbuilder
: ModelBuilder)
617 # The variable associated to the receiver (if any)
618 var selfvariable
: nullable Variable
621 redef class AMethPropdef
622 redef fun do_typing
(modelbuilder
: ModelBuilder)
624 var nblock
= self.n_block
625 if nblock
== null then return
627 var mpropdef
= self.mpropdef
628 if mpropdef
== null then return # skip error
630 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
631 self.selfvariable
= v
.selfvariable
633 var mmethoddef
= self.mpropdef
.as(not null)
634 var msignature
= mmethoddef
.msignature
635 if msignature
== null then return # skip error
636 for i
in [0..msignature
.arity
[ do
637 var mtype
= msignature
.mparameters
[i
].mtype
638 if msignature
.vararg_rank
== i
then
639 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
640 if arrayclass
== null then return # Skip error
641 mtype
= arrayclass
.get_mtype
([mtype
])
643 var variable
= self.n_signature
.n_params
[i
].variable
644 assert variable
!= null
645 variable
.declared_type
= mtype
651 if not v
.has_loop
or not v
.dirty
then break
654 if not nblock
.after_flow_context
.is_unreachable
and msignature
.return_mtype
!= null then
655 # We reach the end of the function without having a return, it is bad
656 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
661 redef class AAttrPropdef
662 redef fun do_typing
(modelbuilder
: ModelBuilder)
664 if not has_value
then return
666 var mpropdef
= self.mpropdef
667 if mpropdef
== null then return # skip error
669 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
670 self.selfvariable
= v
.selfvariable
672 var nexpr
= self.n_expr
673 if nexpr
!= null then
674 var mtype
= self.mpropdef
.static_mtype
675 v
.visit_expr_subtype
(nexpr
, mtype
)
677 var nblock
= self.n_block
678 if nblock
!= null then
680 if not nblock
.after_flow_context
.is_unreachable
then
681 # We reach the end of the init without having a return, it is bad
682 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
691 # The static type of the expression.
692 # null if self is a statement or in case of error
693 var mtype
: nullable MType = null
695 # Is the statement correctly typed?
696 # Used to distinguish errors and statements when `mtype == null`
697 var is_typed
: Bool = false
699 # If required, the following implicit cast `.as(XXX)`
700 # Such a cast may by required after evaluating the expression when
701 # a unsafe operation is detected (silently accepted by the Nit language).
702 # The attribute is computed by `check_subtype`
703 var implicit_cast_to
: nullable MType = null
705 # Return the variable read (if any)
706 # Used to perform adaptive typing
707 fun its_variable
: nullable Variable do return null
709 private fun accept_typing
(v
: TypeVisitor)
711 v
.error
(self, "no implemented accept_typing for {self.class_name}")
714 # Is non-null if `self` is a leaf of a comprehension array construction.
715 # In this case, the enclosing literal array node is designated.
716 # The result of the evaluation of `self` must be
717 # stored inside the designated array (there is an implicit `push`)
718 var comprehension
: nullable AArrayExpr = null
721 redef class ABlockExpr
722 redef fun accept_typing
(v
)
724 for e
in self.n_expr
do v
.visit_stmt
(e
)
728 # The type of a blockexpr is the one of the last expression (or null if empty)
731 if self.n_expr
.is_empty
then return null
732 return self.n_expr
.last
.mtype
736 redef class AVardeclExpr
737 redef fun accept_typing
(v
)
739 var variable
= self.variable
740 if variable
== null then return # Skip error
742 var ntype
= self.n_type
743 var mtype
: nullable MType
744 if ntype
== null then
747 mtype
= v
.resolve_mtype
(ntype
)
748 if mtype
== null then return # Skip error
751 var nexpr
= self.n_expr
752 if nexpr
!= null then
753 if mtype
!= null then
754 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
755 if etype
== mtype
then
757 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
760 mtype
= v
.visit_expr
(nexpr
)
761 if mtype
== null then return # Skip error
766 if mtype
== null or mtype
isa MNullType then
767 var objclass
= v
.get_mclass
(self, "Object")
768 if objclass
== null then return # skip error
769 decltype
= objclass
.mclass_type
.as_nullable
770 if mtype
== null then mtype
= decltype
773 variable
.declared_type
= decltype
774 v
.set_variable
(self, variable
, mtype
)
776 #debug("var {variable}: {mtype}")
784 redef fun its_variable
do return self.variable
785 redef fun accept_typing
(v
)
787 var variable
= self.variable
788 if variable
== null then return # Skip error
790 var mtype
= v
.get_variable
(self, variable
)
791 if mtype
!= null then
792 #debug("{variable} is {mtype}")
794 #debug("{variable} is untyped")
801 redef class AVarAssignExpr
802 redef fun accept_typing
(v
)
804 var variable
= self.variable
805 assert variable
!= null
807 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
809 v
.set_variable
(self, variable
, mtype
)
815 redef class AReassignFormExpr
816 # The method designed by the reassign operator.
817 var reassign_callsite
: nullable CallSite
819 var read_type
: nullable MType = null
821 # Determine the `reassign_property`
822 # `readtype` is the type of the reading of the left value.
823 # `writetype` is the type of the writing of the left value.
824 # (Because of `ACallReassignExpr`, both can be different.
825 # Return the static type of the value to store.
826 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
828 var reassign_name
: String
829 if self.n_assign_op
isa APlusAssignOp then
831 else if self.n_assign_op
isa AMinusAssignOp then
837 self.read_type
= readtype
839 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
840 if callsite
== null then return null # Skip error
841 self.reassign_callsite
= callsite
843 var msignature
= callsite
.msignature
844 var rettype
= msignature
.return_mtype
845 assert msignature
.arity
== 1 and rettype
!= null
847 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
848 if value_type
== null then return null # Skip error
850 v
.check_subtype
(self, rettype
, writetype
)
855 redef class AVarReassignExpr
856 redef fun accept_typing
(v
)
858 var variable
= self.variable
859 assert variable
!= null
861 var readtype
= v
.get_variable
(self, variable
)
862 if readtype
== null then return
866 var writetype
= variable
.declared_type
867 if writetype
== null then return
869 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
871 v
.set_variable
(self, variable
, rettype
)
878 redef class AContinueExpr
879 redef fun accept_typing
(v
)
881 var nexpr
= self.n_expr
882 if nexpr
!= null then
889 redef class ABreakExpr
890 redef fun accept_typing
(v
)
892 var nexpr
= self.n_expr
893 if nexpr
!= null then
900 redef class AReturnExpr
901 redef fun accept_typing
(v
)
903 var nexpr
= self.n_expr
905 var mpropdef
= v
.mpropdef
906 if mpropdef
isa MMethodDef then
907 ret_type
= mpropdef
.msignature
.return_mtype
908 else if mpropdef
isa MAttributeDef then
909 ret_type
= mpropdef
.static_mtype
913 if nexpr
!= null then
914 if ret_type
!= null then
915 v
.visit_expr_subtype
(nexpr
, ret_type
)
918 v
.error
(self, "Error: Return with value in a procedure.")
920 else if ret_type
!= null then
921 v
.error
(self, "Error: Return without value in a function.")
927 redef class AAbortExpr
928 redef fun accept_typing
(v
)
935 redef fun accept_typing
(v
)
937 v
.visit_expr_bool
(n_expr
)
944 if n_then
!= null and n_else
== null then
945 self.mtype
= n_then
.mtype
950 redef class AIfexprExpr
951 redef fun accept_typing
(v
)
953 v
.visit_expr_bool
(n_expr
)
955 var t1
= v
.visit_expr
(n_then
)
956 var t2
= v
.visit_expr
(n_else
)
958 if t1
== null or t2
== null then
962 var t
= v
.merge_types
(self, [t1
, t2
])
964 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
971 redef fun accept_typing
(v
)
973 v
.visit_stmt
(n_block
)
978 redef class AWhileExpr
979 redef fun accept_typing
(v
)
982 v
.visit_expr_bool
(n_expr
)
983 v
.visit_stmt
(n_block
)
988 redef class ALoopExpr
989 redef fun accept_typing
(v
)
992 v
.visit_stmt
(n_block
)
998 var coltype
: nullable MClassType
1000 var method_iterator
: nullable CallSite
1001 var method_is_ok
: nullable CallSite
1002 var method_item
: nullable CallSite
1003 var method_next
: nullable CallSite
1004 var method_key
: nullable CallSite
1005 var method_finish
: nullable CallSite
1007 var method_lt
: nullable CallSite
1008 var method_successor
: nullable CallSite
1010 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
1012 if mtype
isa MNullType then
1013 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
1018 var objcla
= v
.get_mclass
(self, "Object")
1019 if objcla
== null then return
1021 # check iterator method
1022 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
1023 if itdef
== null then
1024 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
1027 self.method_iterator
= itdef
1029 # check that iterator return something
1030 var ittype
= itdef
.msignature
.return_mtype
1031 if ittype
== null then
1032 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1037 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1038 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1042 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1044 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1045 var variables
= self.variables
1046 if variables
.length
!= 1 then
1047 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
1049 variables
.first
.declared_type
= coltype
.arguments
.first
1054 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1056 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1057 var variables
= self.variables
1058 if variables
.length
!= 2 then
1059 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
1061 variables
[0].declared_type
= coltype
.arguments
[0]
1062 variables
[1].declared_type
= coltype
.arguments
[1]
1067 if not is_col
and not is_map
then
1068 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1072 # anchor formal and virtual types
1073 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1075 mtype
= mtype
.undecorate
1076 self.coltype
= mtype
.as(MClassType)
1078 # get methods is_ok, next, item
1079 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1080 if ikdef
== null then
1081 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1084 self.method_is_ok
= ikdef
1086 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1087 if itemdef
== null then
1088 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1091 self.method_item
= itemdef
1093 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1094 if nextdef
== null then
1095 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1098 self.method_next
= nextdef
1100 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1103 var keydef
= v
.get_method
(self, ittype
, "key", false)
1104 if keydef
== null then
1105 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1108 self.method_key
= keydef
1111 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1112 var variable
= variables
.first
1113 var vtype
= variable
.declared_type
.as(not null)
1115 if n_expr
isa AOrangeExpr then
1116 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1118 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1121 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1125 redef fun accept_typing
(v
)
1128 var mtype
= v
.visit_expr
(n_expr
)
1129 if mtype
== null then return
1131 self.do_type_iterator
(v
, mtype
)
1133 v
.visit_stmt
(n_block
)
1135 self.mtype
= n_block
.mtype
1136 self.is_typed
= true
1140 redef class AWithExpr
1141 var method_start
: nullable CallSite
1142 var method_finish
: nullable CallSite
1144 redef fun accept_typing
(v
: TypeVisitor)
1146 var mtype
= v
.visit_expr
(n_expr
)
1147 if mtype
== null then return
1149 method_start
= v
.get_method
(self, mtype
, "start", n_expr
isa ASelfExpr)
1150 method_finish
= v
.get_method
(self, mtype
, "finish", n_expr
isa ASelfExpr)
1152 v
.visit_stmt
(n_block
)
1153 self.mtype
= n_block
.mtype
1154 self.is_typed
= true
1158 redef class AAssertExpr
1159 redef fun accept_typing
(v
)
1161 v
.visit_expr_bool
(n_expr
)
1163 v
.visit_stmt
(n_else
)
1164 self.is_typed
= true
1169 redef fun accept_typing
(v
)
1171 v
.visit_expr_bool
(n_expr
)
1172 v
.visit_expr_bool
(n_expr2
)
1173 self.mtype
= v
.type_bool
(self)
1177 redef class AImpliesExpr
1178 redef fun accept_typing
(v
)
1180 v
.visit_expr_bool
(n_expr
)
1181 v
.visit_expr_bool
(n_expr2
)
1182 self.mtype
= v
.type_bool
(self)
1186 redef class AAndExpr
1187 redef fun accept_typing
(v
)
1189 v
.visit_expr_bool
(n_expr
)
1190 v
.visit_expr_bool
(n_expr2
)
1191 self.mtype
= v
.type_bool
(self)
1196 redef class ANotExpr
1197 redef fun accept_typing
(v
)
1199 v
.visit_expr_bool
(n_expr
)
1200 self.mtype
= v
.type_bool
(self)
1204 redef class AOrElseExpr
1205 redef fun accept_typing
(v
)
1207 var t1
= v
.visit_expr
(n_expr
)
1208 var t2
= v
.visit_expr
(n_expr2
)
1210 if t1
== null or t2
== null then
1214 if t1
isa MNullType then
1215 v
.error
(n_expr
, "Type error: or else on null")
1216 else if v
.check_can_be_null
(n_expr
, t1
) then
1220 var t
= v
.merge_types
(self, [t1
, t2
])
1222 var c
= v
.get_mclass
(self, "Object")
1223 if c
== null then return # forward error
1225 if v
.can_be_null
(t2
) then
1228 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1234 redef class ATrueExpr
1235 redef fun accept_typing
(v
)
1237 self.mtype
= v
.type_bool
(self)
1241 redef class AFalseExpr
1242 redef fun accept_typing
(v
)
1244 self.mtype
= v
.type_bool
(self)
1248 redef class AIntExpr
1249 redef fun accept_typing
(v
)
1251 var mclass
= v
.get_mclass
(self, "Int")
1252 if mclass
== null then return # Forward error
1253 self.mtype
= mclass
.mclass_type
1257 redef class AFloatExpr
1258 redef fun accept_typing
(v
)
1260 var mclass
= v
.get_mclass
(self, "Float")
1261 if mclass
== null then return # Forward error
1262 self.mtype
= mclass
.mclass_type
1266 redef class ACharExpr
1267 redef fun accept_typing
(v
)
1269 var mclass
= v
.get_mclass
(self, "Char")
1270 if mclass
== null then return # Forward error
1271 self.mtype
= mclass
.mclass_type
1275 redef class AStringFormExpr
1276 redef fun accept_typing
(v
)
1278 var mclass
= v
.get_mclass
(self, "String")
1279 if mclass
== null then return # Forward error
1280 self.mtype
= mclass
.mclass_type
1284 redef class ASuperstringExpr
1285 redef fun accept_typing
(v
)
1287 var mclass
= v
.get_mclass
(self, "String")
1288 if mclass
== null then return # Forward error
1289 self.mtype
= mclass
.mclass_type
1290 var objclass
= v
.get_mclass
(self, "Object")
1291 if objclass
== null then return # Forward error
1292 var objtype
= objclass
.mclass_type
1293 for nexpr
in self.n_exprs
do
1294 v
.visit_expr_subtype
(nexpr
, objtype
)
1299 redef class AArrayExpr
1300 # The `with_capacity` method on Array
1301 var with_capacity_callsite
: nullable CallSite
1303 # The `push` method on arrays
1304 var push_callsite
: nullable CallSite
1306 # The element of each type
1307 var element_mtype
: nullable MType
1309 # Set that `self` is a part of comprehension array `na`
1310 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1311 private fun set_comprehension
(n
: nullable AExpr)
1315 else if n
isa AForExpr then
1316 set_comprehension
(n
.n_block
)
1317 else if n
isa AIfExpr then
1318 set_comprehension
(n
.n_then
)
1319 set_comprehension
(n
.n_else
)
1322 n
.comprehension
= self
1325 redef fun accept_typing
(v
)
1327 var mtype
: nullable MType = null
1328 var ntype
= self.n_type
1329 if ntype
!= null then
1330 mtype
= v
.resolve_mtype
(ntype
)
1331 if mtype
== null then return # Skip error
1333 var mtypes
= new Array[nullable MType]
1335 for e
in self.n_exprs
do
1336 var t
= v
.visit_expr
(e
)
1340 set_comprehension
(e
)
1341 if mtype
!= null then
1342 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1343 if t
== mtype
then useless
= true
1348 if mtype
== null then
1349 # Ensure monotony for type adaptation on loops
1350 if self.element_mtype
!= null then mtypes
.add
self.element_mtype
1351 mtype
= v
.merge_types
(self, mtypes
)
1353 if mtype
== null or mtype
isa MNullType then
1354 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1358 assert ntype
!= null
1359 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1362 self.element_mtype
= mtype
1364 var mclass
= v
.get_mclass
(self, "Array")
1365 if mclass
== null then return # Forward error
1366 var array_mtype
= mclass
.get_mtype
([mtype
])
1368 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1369 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1371 self.mtype
= array_mtype
1375 redef class ARangeExpr
1376 var init_callsite
: nullable CallSite
1378 redef fun accept_typing
(v
)
1380 var discrete_class
= v
.get_mclass
(self, "Discrete")
1381 if discrete_class
== null then return # Forward error
1382 var discrete_type
= discrete_class
.intro
.bound_mtype
1383 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1384 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1385 if t1
== null or t2
== null then return
1386 var mclass
= v
.get_mclass
(self, "Range")
1387 if mclass
== null then return # Forward error
1389 if v
.is_subtype
(t1
, t2
) then
1390 mtype
= mclass
.get_mtype
([t2
])
1391 else if v
.is_subtype
(t2
, t1
) then
1392 mtype
= mclass
.get_mtype
([t1
])
1394 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1400 # get the constructor
1402 if self isa ACrangeExpr then
1403 callsite
= v
.get_method
(self, mtype
, "init", false)
1404 else if self isa AOrangeExpr then
1405 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1409 init_callsite
= callsite
1413 redef class ANullExpr
1414 redef fun accept_typing
(v
)
1416 self.mtype
= v
.mmodule
.model
.null_type
1420 redef class AIsaExpr
1421 # The static type to cast to.
1422 # (different from the static type of the expression that is `Bool`).
1423 var cast_type
: nullable MType
1424 redef fun accept_typing
(v
)
1426 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1427 self.cast_type
= mtype
1429 var variable
= self.n_expr
.its_variable
1430 if variable
!= null then
1431 #var orig = self.n_expr.mtype
1432 #var from = if orig != null then orig.to_s else "invalid"
1433 #var to = if mtype != null then mtype.to_s else "invalid"
1434 #debug("adapt {variable}: {from} -> {to}")
1435 self.after_flow_context
.when_true
.set_var
(v
, variable
, mtype
)
1438 self.mtype
= v
.type_bool
(self)
1442 redef class AAsCastExpr
1443 redef fun accept_typing
(v
)
1445 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1449 redef class AAsNotnullExpr
1450 redef fun accept_typing
(v
)
1452 var mtype
= v
.visit_expr
(self.n_expr
)
1453 if mtype
== null then return # Forward error
1455 if mtype
isa MNullType then
1456 v
.error
(self, "Type error: as(not null) on null")
1460 if v
.check_can_be_null
(n_expr
, mtype
) then
1461 mtype
= mtype
.as_notnull
1468 redef class AParExpr
1469 redef fun accept_typing
(v
)
1471 self.mtype
= v
.visit_expr
(self.n_expr
)
1475 redef class AOnceExpr
1476 redef fun accept_typing
(v
)
1478 self.mtype
= v
.visit_expr
(self.n_expr
)
1482 redef class ASelfExpr
1483 redef var its_variable
: nullable Variable
1484 redef fun accept_typing
(v
)
1486 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1487 v
.error
(self, "Error: self cannot be used in top-level method.")
1489 var variable
= v
.selfvariable
1490 self.its_variable
= variable
1491 self.mtype
= v
.get_variable
(self, variable
)
1495 redef class AImplicitSelfExpr
1496 # Is the implicit receiver `sys`?
1498 # By default, the implicit receiver is `self`.
1499 # But when there is not method for `self`, `sys` is used as a fall-back.
1500 # Is this case this flag is set to `true`.
1504 ## MESSAGE SENDING AND PROPERTY
1506 redef class ASendExpr
1507 # The property invoked by the send.
1508 var callsite
: nullable CallSite
1510 redef fun accept_typing
(v
)
1512 var nrecv
= self.n_expr
1513 var recvtype
= v
.visit_expr
(nrecv
)
1514 var name
= self.property_name
1516 if recvtype
== null then return # Forward error
1519 var unsafe_type
= v
.anchor_to
(recvtype
)
1520 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1521 if mproperty
== null and nrecv
isa AImplicitSelfExpr then
1522 # Special fall-back search in `sys` when noting found in the implicit receiver.
1523 var sysclass
= v
.try_get_mclass
(self, "Sys")
1524 if sysclass
!= null then
1525 var systype
= sysclass
.mclass_type
1526 mproperty
= v
.try_get_mproperty_by_name2
(self, systype
, name
)
1527 if mproperty
!= null then
1528 callsite
= v
.get_method
(self, systype
, name
, false)
1529 if callsite
== null then return # Forward error
1530 # Update information, we are looking at `sys` now, not `self`
1532 nrecv
.its_variable
= null
1533 nrecv
.mtype
= systype
1538 if callsite
== null then
1539 # If still nothing, just exit
1540 callsite
= v
.get_method
(self, recvtype
, name
, nrecv
isa ASelfExpr)
1541 if callsite
== null then return
1544 self.callsite
= callsite
1545 var msignature
= callsite
.msignature
1547 var args
= compute_raw_arguments
1549 callsite
.check_signature
(v
, args
)
1551 if callsite
.mproperty
.is_init
then
1552 var vmpropdef
= v
.mpropdef
1553 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1554 v
.error
(self, "Can call a init only in another init")
1556 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1557 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1561 var ret
= msignature
.return_mtype
1565 self.is_typed
= true
1569 # The name of the property
1570 # Each subclass simply provide the correct name.
1571 private fun property_name
: String is abstract
1573 # The node identifying the name (id, operator, etc) for messages.
1575 # Is `self` by default
1576 private fun property_node
: ANode do return self
1578 # An array of all arguments (excluding self)
1579 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1581 private fun compute_raw_arguments
: Array[AExpr] is abstract
1584 redef class ABinopExpr
1585 redef fun compute_raw_arguments
do return [n_expr2
]
1588 redef fun property_name
do return "=="
1589 redef fun accept_typing
(v
)
1596 redef fun property_name
do return "!="
1597 redef fun accept_typing
(v
)
1604 redef fun property_name
do return "<"
1607 redef fun property_name
do return "<="
1610 redef fun property_name
do return "<<"
1613 redef fun property_name
do return ">"
1616 redef fun property_name
do return ">="
1619 redef fun property_name
do return ">>"
1621 redef class APlusExpr
1622 redef fun property_name
do return "+"
1624 redef class AMinusExpr
1625 redef fun property_name
do return "-"
1627 redef class AStarshipExpr
1628 redef fun property_name
do return "<=>"
1630 redef class AStarExpr
1631 redef fun property_name
do return "*"
1633 redef class AStarstarExpr
1634 redef fun property_name
do return "**"
1636 redef class ASlashExpr
1637 redef fun property_name
do return "/"
1639 redef class APercentExpr
1640 redef fun property_name
do return "%"
1643 redef class AUminusExpr
1644 redef fun property_name
do return "unary -"
1645 redef fun compute_raw_arguments
do return new Array[AExpr]
1649 redef class ACallExpr
1650 redef fun property_name
do return n_id
.text
1651 redef fun property_node
do return n_id
1652 redef fun compute_raw_arguments
do return n_args
.to_a
1655 redef class ACallAssignExpr
1656 redef fun property_name
do return n_id
.text
+ "="
1657 redef fun property_node
do return n_id
1658 redef fun compute_raw_arguments
1660 var res
= n_args
.to_a
1666 redef class ABraExpr
1667 redef fun property_name
do return "[]"
1668 redef fun compute_raw_arguments
do return n_args
.to_a
1671 redef class ABraAssignExpr
1672 redef fun property_name
do return "[]="
1673 redef fun compute_raw_arguments
1675 var res
= n_args
.to_a
1681 redef class ASendReassignFormExpr
1682 # The property invoked for the writing
1683 var write_callsite
: nullable CallSite
1685 redef fun accept_typing
(v
)
1687 var recvtype
= v
.visit_expr
(self.n_expr
)
1688 var name
= self.property_name
1689 var node
= self.property_node
1691 if recvtype
== null then return # Forward error
1693 var for_self
= self.n_expr
isa ASelfExpr
1694 var callsite
= v
.get_method
(node
, recvtype
, name
, for_self
)
1696 if callsite
== null then return
1697 self.callsite
= callsite
1699 var args
= compute_raw_arguments
1701 callsite
.check_signature
(v
, args
)
1703 var readtype
= callsite
.msignature
.return_mtype
1704 if readtype
== null then
1705 v
.error
(self, "Error: {name} is not a function")
1709 var wcallsite
= v
.get_method
(node
, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1710 if wcallsite
== null then return
1711 self.write_callsite
= wcallsite
1713 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1714 if wtype
== null then return
1716 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1717 args
.add
(self.n_value
)
1718 wcallsite
.check_signature
(v
, args
)
1720 self.is_typed
= true
1724 redef class ACallReassignExpr
1725 redef fun property_name
do return n_id
.text
1726 redef fun property_node
do return n_id
1727 redef fun compute_raw_arguments
do return n_args
.to_a
1730 redef class ABraReassignExpr
1731 redef fun property_name
do return "[]"
1732 redef fun compute_raw_arguments
do return n_args
.to_a
1735 redef class AInitExpr
1736 redef fun property_name
do return "init"
1737 redef fun property_node
do return n_kwinit
1738 redef fun compute_raw_arguments
do return n_args
.to_a
1742 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1747 redef class ASuperExpr
1748 # The method to call if the super is in fact a 'super init call'
1749 # Note: if the super is a normal call-next-method, then this attribute is null
1750 var callsite
: nullable CallSite
1752 # The method to call is the super is a standard `call-next-method` super-call
1753 # Note: if the super is a special super-init-call, then this attribute is null
1754 var mpropdef
: nullable MMethodDef
1756 redef fun accept_typing
(v
)
1758 var anchor
= v
.anchor
1759 assert anchor
!= null
1760 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1761 assert recvtype
!= null
1762 var mproperty
= v
.mpropdef
.mproperty
1763 if not mproperty
isa MMethod then
1764 v
.error
(self, "Error: super only usable in a method")
1767 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1768 if superprops
.length
== 0 then
1769 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1770 process_superinit
(v
)
1773 v
.error
(self, "Error: No super method to call for {mproperty}.")
1776 # FIXME: covariance of return type in linear extension?
1777 var superprop
= superprops
.first
1779 var msignature
= superprop
.msignature
.as(not null)
1780 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1781 var args
= self.n_args
.to_a
1782 if args
.length
> 0 then
1783 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1785 self.mtype
= msignature
.return_mtype
1786 self.is_typed
= true
1787 v
.mpropdef
.has_supercall
= true
1788 mpropdef
= v
.mpropdef
.as(MMethodDef)
1791 private fun process_superinit
(v
: TypeVisitor)
1793 var anchor
= v
.anchor
1794 assert anchor
!= null
1795 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1796 assert recvtype
!= null
1797 var mpropdef
= v
.mpropdef
1798 assert mpropdef
isa MMethodDef
1799 var mproperty
= mpropdef
.mproperty
1800 var superprop
: nullable MMethodDef = null
1801 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1802 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1803 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1804 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1805 if candidate
== null then
1806 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1807 continue # Try next super-class
1809 if superprop
!= null and candidate
.is_root_init
then
1812 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1813 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1816 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1817 if superprop
!= null and superprop
.mproperty
== candidate
then
1818 if superprop
== candidatedefs
.first
then continue
1819 candidatedefs
.add
(superprop
)
1821 if candidatedefs
.length
> 1 then
1822 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1825 superprop
= candidatedefs
.first
1827 if superprop
== null then
1828 v
.error
(self, "Error: No super method to call for {mproperty}.")
1832 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1833 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1835 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1836 self.callsite
= callsite
1838 var args
= self.n_args
.to_a
1839 if args
.length
> 0 then
1840 callsite
.check_signature
(v
, args
)
1842 # Check there is at least enough parameters
1843 if mpropdef
.msignature
.arity
< msignature
.arity
then
1844 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1847 # Check that each needed parameter is conform
1849 for sp
in msignature
.mparameters
do
1850 var p
= mpropdef
.msignature
.mparameters
[i
]
1851 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1852 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1859 self.is_typed
= true
1865 redef class ANewExpr
1866 # The constructor invoked by the new.
1867 var callsite
: nullable CallSite
1869 # The designated type
1870 var recvtype
: nullable MClassType
1872 redef fun accept_typing
(v
)
1874 var recvtype
= v
.resolve_mtype
(self.n_type
)
1875 if recvtype
== null then return
1877 if not recvtype
isa MClassType then
1878 if recvtype
isa MNullableType then
1879 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1882 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1887 self.recvtype
= recvtype
1888 var kind
= recvtype
.mclass
.kind
1900 if name
== "intern" then
1901 if kind
!= concrete_kind
then
1902 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1905 if n_args
.n_exprs
.not_empty
then
1906 v
.error
(n_args
, "Type Error: the intern constructor expects no arguments.")
1910 self.mtype
= recvtype
1914 var callsite
= v
.get_method
(node
, recvtype
, name
, false)
1915 if callsite
== null then return
1917 if not callsite
.mproperty
.is_new
then
1918 if kind
!= concrete_kind
then
1919 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1922 self.mtype
= recvtype
1924 self.mtype
= callsite
.msignature
.return_mtype
1925 assert self.mtype
!= null
1928 self.callsite
= callsite
1930 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1931 v
.error
(self, "Error: {name} is not a constructor.")
1935 var args
= n_args
.to_a
1936 callsite
.check_signature
(v
, args
)
1942 redef class AAttrFormExpr
1943 # The attribute acceded.
1944 var mproperty
: nullable MAttribute
1946 # The static type of the attribute.
1947 var attr_type
: nullable MType
1949 # Resolve the attribute acceded.
1950 private fun resolve_property
(v
: TypeVisitor)
1952 var recvtype
= v
.visit_expr
(self.n_expr
)
1953 if recvtype
== null then return # Skip error
1954 var name
= self.n_id
.text
1955 if recvtype
isa MNullType then
1956 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1960 var unsafe_type
= v
.anchor_to
(recvtype
)
1961 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1962 if mproperty
== null then
1963 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1966 assert mproperty
isa MAttribute
1967 self.mproperty
= mproperty
1969 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1970 assert mpropdefs
.length
== 1
1971 var mpropdef
= mpropdefs
.first
1972 var attr_type
= mpropdef
.static_mtype
1973 if attr_type
== null then return # skip error
1974 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1975 self.attr_type
= attr_type
1979 redef class AAttrExpr
1980 redef fun accept_typing
(v
)
1982 self.resolve_property
(v
)
1983 self.mtype
= self.attr_type
1988 redef class AAttrAssignExpr
1989 redef fun accept_typing
(v
)
1991 self.resolve_property
(v
)
1992 var mtype
= self.attr_type
1994 v
.visit_expr_subtype
(self.n_value
, mtype
)
1995 self.is_typed
= true
1999 redef class AAttrReassignExpr
2000 redef fun accept_typing
(v
)
2002 self.resolve_property
(v
)
2003 var mtype
= self.attr_type
2004 if mtype
== null then return # Skip error
2006 self.resolve_reassignment
(v
, mtype
, mtype
)
2008 self.is_typed
= true
2012 redef class AIssetAttrExpr
2013 redef fun accept_typing
(v
)
2015 self.resolve_property
(v
)
2016 var mtype
= self.attr_type
2017 if mtype
== null then return # Skip error
2019 var recvtype
= self.n_expr
.mtype
.as(not null)
2020 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
2021 if bound
isa MNullableType then
2022 v
.error
(self, "Error: isset on a nullable attribute.")
2024 self.mtype
= v
.type_bool
(self)
2028 redef class AVarargExpr
2029 redef fun accept_typing
(v
)
2031 # This kind of pseudo-expression can be only processed trough a signature
2032 # See `check_signature`
2033 # Other cases are a syntax error.
2034 v
.error
(self, "Syntax error: unexpected `...`")
2040 redef class ADebugTypeExpr
2041 redef fun accept_typing
(v
)
2043 var expr
= v
.visit_expr
(self.n_expr
)
2044 if expr
== null then return
2045 var unsafe
= v
.anchor_to
(expr
)
2046 var ntype
= self.n_type
2047 var mtype
= v
.resolve_mtype
(ntype
)
2048 if mtype
!= null and mtype
!= expr
then
2049 var umtype
= v
.anchor_to
(mtype
)
2050 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
2052 self.is_typed
= true