1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Intraprocedural resolution of static types and OO-services
18 # By OO-services we mean message sending, attribute access, instantiation, etc.
24 redef class ToolContext
25 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
28 private class TypingPhase
30 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
33 private class TypeVisitor
34 var modelbuilder
: ModelBuilder
36 # The module of the analysis
37 # Used to correctly query the model
40 # The static type of the receiver
41 # Mainly used for type tests and type resolutions
42 var anchor
: nullable MClassType = null
44 # The analyzed mclassdef
45 var mclassdef
: nullable MClassDef = null
47 # The analyzed property
48 var mpropdef
: nullable MPropDef
50 var selfvariable
= new Variable("self")
52 # Is `self` use restricted?
53 # * no explicit `self`
54 # * method called on the implicit self must be top-level
55 var is_toplevel_context
= false
59 var mpropdef
= self.mpropdef
61 if mpropdef
!= null then
62 self.mpropdef
= mpropdef
63 var mclassdef
= mpropdef
.mclassdef
64 self.mclassdef
= mclassdef
65 self.anchor
= mclassdef
.bound_mtype
67 var mclass
= mclassdef
.mclass
69 var selfvariable
= new Variable("self")
70 self.selfvariable
= selfvariable
71 selfvariable
.declared_type
= mclass
.mclass_type
73 var mprop
= mpropdef
.mproperty
74 if mprop
isa MMethod and (mprop
.is_toplevel
or mprop
.is_new
) then
75 is_toplevel_context
= true
80 fun anchor_to
(mtype
: MType): MType
83 if anchor
== null then
84 assert not mtype
.need_anchor
87 return mtype
.anchor_to
(mmodule
, anchor
)
90 fun is_subtype
(sub
, sup
: MType): Bool
92 return sub
.is_subtype
(mmodule
, anchor
, sup
)
95 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
97 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
98 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
102 # Check that `sub` is a subtype of `sup`.
103 # If `sub` is not a valid suptype, then display an error on `node` an return null.
104 # If `sub` is a safe subtype of `sup` then return `sub`.
105 # If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
107 # The point of the return type is to determinate the usable type on an expression:
108 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
109 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
110 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
112 if self.is_subtype
(sub
, sup
) then return sub
113 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
114 # FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
115 #node.debug("Unsafe typing: expected {sup}, got {sub}")
118 if sub
.need_anchor
then
119 var u
= anchor_to
(sub
)
120 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}: {u}")
122 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
127 # Visit an expression and do not care about the return value
128 fun visit_stmt
(nexpr
: nullable AExpr)
130 if nexpr
== null then return
131 nexpr
.accept_typing
(self)
134 # Visit an expression and expects that it is not a statement
135 # Return the type of the expression
136 # Display an error and return null if:
137 # * the type cannot be determined or
138 # * `nexpr` is a statement
139 fun visit_expr
(nexpr
: AExpr): nullable MType
141 nexpr
.accept_typing
(self)
142 var mtype
= nexpr
.mtype
143 if mtype
!= null then return mtype
144 if not nexpr
.is_typed
then
145 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
146 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
147 nexpr
.debug
("No return type but no error.")
150 return null # forward error
152 self.error
(nexpr
, "Type error: expected expression.")
156 # Visit an expression and expect its static type is a least a `sup`
157 # Return the type of the expression or null if
158 # * the type cannot be determined or
159 # * `nexpr` is a statement or
160 # * `nexpr` is not a `sup`
161 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
163 var sub
= visit_expr
(nexpr
)
164 if sub
== null then return null # Forward error
166 if sup
== null then return null # Forward error
168 var res
= check_subtype
(nexpr
, sub
, sup
)
170 nexpr
.implicit_cast_to
= res
175 # Visit an expression and expect its static type is a `Bool`
176 # Return the type of the expression or null if
177 # * the type cannot be determined or
178 # * `nexpr` is a statement or
179 # * `nexpr` is not a `Bool`
180 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
182 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
186 fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
188 var sub
= visit_expr
(nexpr
)
189 if sub
== null then return null # Forward error
191 var sup
= self.resolve_mtype
(ntype
)
192 if sup
== null then return null # Forward error
195 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup}.")
196 else if self.is_subtype
(sub
, sup
) then
197 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup} since it is a {sub}.")
202 # Can `mtype` be null (up to the current knowledge)?
203 fun can_be_null
(mtype
: MType): Bool
205 if mtype
isa MNullableType or mtype
isa MNullType then return true
206 if mtype
isa MFormalType then
207 var x
= anchor_to
(mtype
)
208 if x
isa MNullableType or x
isa MNullType then return true
213 # Check that `mtype` can be null (up to the current knowledge).
215 # If not then display a `useless-null-test` warning on node and return false.
217 fun check_can_be_null
(anode
: ANode, mtype
: MType): Bool
219 if can_be_null
(mtype
) then return true
221 if mtype
isa MFormalType then
222 var res
= anchor_to
(mtype
)
223 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}: {res}`.")
225 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
230 # Special verification on != and == for null
232 fun null_test
(anode
: ABinopExpr)
234 var mtype
= anode
.n_expr
.mtype
235 var mtype2
= anode
.n_expr2
.mtype
237 if mtype
== null or mtype2
== null then return
239 if not mtype2
isa MNullType then return
241 if mtype
isa MNullType then return
243 # Check of useless null
244 if not check_can_be_null
(anode
.n_expr
, mtype
) then return
246 mtype
= mtype
.as_notnull
248 # Check for type adaptation
249 var variable
= anode
.n_expr
.its_variable
250 if variable
== null then return
252 # One is null (mtype2 see above) the other is not null
253 if anode
isa AEqExpr then
254 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
255 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
)
256 else if anode
isa ANeExpr then
257 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
258 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
)
264 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
266 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
269 fun resolve_mtype
(node
: AType): nullable MType
271 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
274 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
276 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
280 fun get_mclass
(node
: ANode, name
: String): nullable MClass
282 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
283 if mclass
== null then
284 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
289 fun type_bool
(node
: ANode): nullable MType
291 var mclass
= self.get_mclass
(node
, "Bool")
292 if mclass
== null then return null
293 return mclass
.mclass_type
296 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
298 var unsafe_type
= self.anchor_to
(recvtype
)
300 #debug("recv: {recvtype} (aka {unsafe_type})")
301 if recvtype
isa MNullType then
302 # `null` only accepts some methods of object.
303 if name
== "==" or name
== "!=" or name
== "is_same_instance" then
304 unsafe_type
= mmodule
.object_type
.as_nullable
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
.as(not null)
365 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
367 var erasure_cast
= false
368 var rettype
= mpropdef
.msignature
.return_mtype
369 if not recv_is_self
and rettype
!= null then
370 rettype
= rettype
.undecorate
371 if rettype
isa MParameterType then
372 var erased_rettype
= msignature
.return_mtype
373 assert erased_rettype
!= null
374 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
379 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
383 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
385 var unsafe_type
= self.anchor_to
(recvtype
)
386 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
387 if mproperty
== null then return null
388 return get_method
(node
, recvtype
, name
, recv_is_self
)
392 # Visit the expressions of args and check their conformity with the corresponding type in signature
393 # The point of this method is to handle varargs correctly
394 # Note: The signature must be correctly adapted
395 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
397 var vararg_rank
= msignature
.vararg_rank
398 if vararg_rank
>= 0 then
399 if args
.length
< msignature
.arity
then
400 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
401 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
404 else if args
.length
!= msignature
.arity
then
405 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
409 #debug("CALL {unsafe_type}.{msignature}")
411 var vararg_decl
= args
.length
- msignature
.arity
412 for i
in [0..msignature
.arity
[ do
414 if i
== vararg_rank
then continue # skip the vararg
415 if i
> vararg_rank
then
418 var paramtype
= msignature
.mparameters
[i
].mtype
419 self.visit_expr_subtype
(args
[j
], paramtype
)
421 if vararg_rank
>= 0 then
422 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
423 var first
= args
[vararg_rank
]
424 if vararg_decl
== 0 and first
isa AVarargExpr then
425 var mclass
= get_mclass
(node
, "Array")
426 if mclass
== null then return false # Forward error
427 var array_mtype
= mclass
.get_mtype
([paramtype
])
428 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
429 first
.mtype
= first
.n_expr
.mtype
431 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
432 self.visit_expr_subtype
(args
[j
], paramtype
)
439 fun error
(node
: ANode, message
: String)
441 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
444 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
446 var flow
= node
.after_flow_context
448 self.error
(node
, "No context!")
452 if flow
.vars
.has_key
(variable
) then
453 return flow
.vars
[variable
]
455 #node.debug("*** START Collected for {variable}")
456 var mtypes
= flow
.collect_types
(variable
)
457 #node.debug("**** END Collected for {variable}")
458 if mtypes
== null or mtypes
.length
== 0 then
459 return variable
.declared_type
460 else if mtypes
.length
== 1 then
463 var res
= merge_types
(node
,mtypes
)
464 if res
== null then res
= variable
.declared_type
470 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
472 var flow
= node
.after_flow_context
475 flow
.set_var
(variable
, mtype
)
478 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
480 if col
.length
== 1 then return col
.first
482 if t1
== null then continue # return null
485 if t2
== null then continue # return null
486 if can_be_null
(t2
) and not can_be_null
(t1
) then
489 if not is_subtype
(t2
, t1
) then found
= false
492 #print "merge {col.join(" ")} -> {t1}"
496 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
501 # A specific method call site with its associated informations.
503 # The associated node for location
506 # The static type of the receiver (possibly unresolved)
509 # The module where the callsite is present
512 # The anchor to use with `recv` or `msignature`
513 var anchor
: nullable MClassType
515 # Is the receiver self?
516 # If "for_self", virtual types of the signature are kept
517 # If "not_for_self", virtual type are erased
518 var recv_is_self
: Bool
520 # The designated method
521 var mproperty
: MMethod
523 # The statically designated method definition
524 # The most specif one, it is.
525 var mpropdef
: MMethodDef
527 # The resolved signature for the receiver
528 var msignature
: MSignature
530 # Is a implicit cast required on erasure typing policy?
531 var erasure_cast
: Bool
533 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
535 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
540 # The declared type of the variable
541 var declared_type
: nullable MType
544 redef class FlowContext
545 # Store changes of types because of type evolution
546 private var vars
= new HashMap[Variable, nullable MType]
547 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
549 # Adapt the variable to a static type
550 # Warning1: do not modify vars directly.
551 # Warning2: sub-flow may have cached a unadapted variable
552 private fun set_var
(variable
: Variable, mtype
: nullable MType)
554 self.vars
[variable
] = mtype
555 self.cache
.keys
.remove
(variable
)
558 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
560 if cache
.has_key
(variable
) then
561 return cache
[variable
]
563 var res
: nullable Array[nullable MType] = null
564 if vars
.has_key
(variable
) then
565 var mtype
= vars
[variable
]
567 else if self.previous
.is_empty
then
569 res
= [variable
.declared_type
]
571 for flow
in self.previous
do
572 if flow
.is_unreachable
then continue
573 var r2
= flow
.collect_types
(variable
)
574 if r2
== null then continue
579 if not res
.has
(t
) then res
.add
(t
)
584 cache
[variable
] = res
590 # The entry point of the whole typing analysis
591 fun do_typing
(modelbuilder
: ModelBuilder)
595 # The variable associated to the receiver (if any)
596 var selfvariable
: nullable Variable
599 redef class AMethPropdef
600 redef fun do_typing
(modelbuilder
: ModelBuilder)
602 var nblock
= self.n_block
603 if nblock
== null then return
605 var mpropdef
= self.mpropdef
.as(not null)
606 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
607 self.selfvariable
= v
.selfvariable
609 var mmethoddef
= self.mpropdef
.as(not null)
610 for i
in [0..mmethoddef
.msignature
.arity
[ do
611 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
612 if mmethoddef
.msignature
.vararg_rank
== i
then
613 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
614 if arrayclass
== null then return # Skip error
615 mtype
= arrayclass
.get_mtype
([mtype
])
617 var variable
= self.n_signature
.n_params
[i
].variable
618 assert variable
!= null
619 variable
.declared_type
= mtype
623 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
624 # We reach the end of the function without having a return, it is bad
625 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
630 redef class AAttrPropdef
631 redef fun do_typing
(modelbuilder
: ModelBuilder)
633 if not has_value
then return
635 var mpropdef
= self.mpropdef
.as(not null)
636 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
637 self.selfvariable
= v
.selfvariable
639 var nexpr
= self.n_expr
640 if nexpr
!= null then
641 var mtype
= self.mpropdef
.static_mtype
642 v
.visit_expr_subtype
(nexpr
, mtype
)
644 var nblock
= self.n_block
645 if nblock
!= null then
647 if not nblock
.after_flow_context
.is_unreachable
then
648 # We reach the end of the init without having a return, it is bad
649 v
.error
(self, "Control error: Reached end of block (a 'return' with a value was expected).")
658 # The static type of the expression.
659 # null if self is a statement or in case of error
660 var mtype
: nullable MType = null
662 # Is the statement correctly typed?
663 # Used to distinguish errors and statements when `mtype == null`
664 var is_typed
: Bool = false
666 # If required, the following implicit cast `.as(XXX)`
667 # Such a cast may by required after evaluating the expression when
668 # a unsafe operation is detected (silently accepted by the Nit language).
669 # The attribute is computed by `check_subtype`
670 var implicit_cast_to
: nullable MType = null
672 # Return the variable read (if any)
673 # Used to perform adaptive typing
674 fun its_variable
: nullable Variable do return null
676 private fun accept_typing
(v
: TypeVisitor)
678 v
.error
(self, "no implemented accept_typing for {self.class_name}")
681 # Is non-null if `self` is a leaf of a comprehension array construction.
682 # In this case, the enclosing literal array node is designated.
683 # The result of the evaluation of `self` must be
684 # stored inside the designated array (there is an implicit `push`)
685 var comprehension
: nullable AArrayExpr = null
688 redef class ABlockExpr
689 redef fun accept_typing
(v
)
691 for e
in self.n_expr
do v
.visit_stmt
(e
)
695 # The type of a blockexpr is the one of the last expression (or null if empty)
698 if self.n_expr
.is_empty
then return null
699 return self.n_expr
.last
.mtype
703 redef class AVardeclExpr
704 redef fun accept_typing
(v
)
706 var variable
= self.variable
707 if variable
== null then return # Skip error
709 var ntype
= self.n_type
710 var mtype
: nullable MType
711 if ntype
== null then
714 mtype
= v
.resolve_mtype
(ntype
)
715 if mtype
== null then return # Skip error
718 var nexpr
= self.n_expr
719 if nexpr
!= null then
720 if mtype
!= null then
721 var etype
= v
.visit_expr_subtype
(nexpr
, mtype
)
722 if etype
== mtype
then
724 v
.modelbuilder
.advice
(ntype
, "useless-type", "Warning: useless type definition for variable `{variable.name}`")
727 mtype
= v
.visit_expr
(nexpr
)
728 if mtype
== null then return # Skip error
733 if mtype
== null or mtype
isa MNullType then
734 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
735 if mtype
== null then mtype
= decltype
738 variable
.declared_type
= decltype
739 v
.set_variable
(self, variable
, mtype
)
741 #debug("var {variable}: {mtype}")
748 redef fun its_variable
do return self.variable
749 redef fun accept_typing
(v
)
751 var variable
= self.variable
752 if variable
== null then return # Skip error
754 var mtype
= v
.get_variable
(self, variable
)
755 if mtype
!= null then
756 #debug("{variable} is {mtype}")
758 #debug("{variable} is untyped")
765 redef class AVarAssignExpr
766 redef fun accept_typing
(v
)
768 var variable
= self.variable
769 assert variable
!= null
771 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
773 v
.set_variable
(self, variable
, mtype
)
779 redef class AReassignFormExpr
780 # The method designed by the reassign operator.
781 var reassign_callsite
: nullable CallSite
783 var read_type
: nullable MType = null
785 # Determine the `reassign_property`
786 # `readtype` is the type of the reading of the left value.
787 # `writetype` is the type of the writing of the left value.
788 # (Because of `ACallReassignExpr`, both can be different.
789 # Return the static type of the value to store.
790 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
792 var reassign_name
: String
793 if self.n_assign_op
isa APlusAssignOp then
795 else if self.n_assign_op
isa AMinusAssignOp then
801 self.read_type
= readtype
803 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
804 if callsite
== null then return null # Skip error
805 self.reassign_callsite
= callsite
807 var msignature
= callsite
.msignature
808 var rettype
= msignature
.return_mtype
809 assert msignature
.arity
== 1 and rettype
!= null
811 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
812 if value_type
== null then return null # Skip error
814 v
.check_subtype
(self, rettype
, writetype
)
819 redef class AVarReassignExpr
820 redef fun accept_typing
(v
)
822 var variable
= self.variable
823 assert variable
!= null
825 var readtype
= v
.get_variable
(self, variable
)
826 if readtype
== null then return
830 var writetype
= variable
.declared_type
831 if writetype
== null then return
833 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
835 v
.set_variable
(self, variable
, rettype
)
842 redef class AContinueExpr
843 redef fun accept_typing
(v
)
845 var nexpr
= self.n_expr
846 if nexpr
!= null then
853 redef class ABreakExpr
854 redef fun accept_typing
(v
)
856 var nexpr
= self.n_expr
857 if nexpr
!= null then
864 redef class AReturnExpr
865 redef fun accept_typing
(v
)
867 var nexpr
= self.n_expr
869 var mpropdef
= v
.mpropdef
870 if mpropdef
isa MMethodDef then
871 ret_type
= mpropdef
.msignature
.return_mtype
872 else if mpropdef
isa MAttributeDef then
873 ret_type
= mpropdef
.static_mtype
877 if nexpr
!= null then
878 if ret_type
!= null then
879 v
.visit_expr_subtype
(nexpr
, ret_type
)
882 v
.error
(self, "Error: Return with value in a procedure.")
884 else if ret_type
!= null then
885 v
.error
(self, "Error: Return without value in a function.")
891 redef class AAbortExpr
892 redef fun accept_typing
(v
)
899 redef fun accept_typing
(v
)
901 v
.visit_expr_bool
(n_expr
)
908 if n_then
!= null and n_else
== null then
909 self.mtype
= n_then
.mtype
914 redef class AIfexprExpr
915 redef fun accept_typing
(v
)
917 v
.visit_expr_bool
(n_expr
)
919 var t1
= v
.visit_expr
(n_then
)
920 var t2
= v
.visit_expr
(n_else
)
922 if t1
== null or t2
== null then
926 var t
= v
.merge_types
(self, [t1
, t2
])
928 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
935 redef fun accept_typing
(v
)
937 v
.visit_stmt
(n_block
)
942 redef class AWhileExpr
943 redef fun accept_typing
(v
)
945 v
.visit_expr_bool
(n_expr
)
947 v
.visit_stmt
(n_block
)
952 redef class ALoopExpr
953 redef fun accept_typing
(v
)
955 v
.visit_stmt
(n_block
)
961 var coltype
: nullable MClassType
963 var method_iterator
: nullable CallSite
964 var method_is_ok
: nullable CallSite
965 var method_item
: nullable CallSite
966 var method_next
: nullable CallSite
967 var method_key
: nullable CallSite
968 var method_finish
: nullable CallSite
970 var method_lt
: nullable CallSite
971 var method_successor
: nullable CallSite
973 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
975 if mtype
isa MNullType then
976 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
981 var objcla
= v
.get_mclass
(self, "Object")
982 if objcla
== null then return
984 # check iterator method
985 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
986 if itdef
== null then
987 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
990 self.method_iterator
= itdef
992 # check that iterator return something
993 var ittype
= itdef
.msignature
.return_mtype
994 if ittype
== null then
995 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1000 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
1001 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
1005 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
1007 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
1008 var variables
= self.variables
1009 if variables
.length
!= 1 then
1010 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
1012 variables
.first
.declared_type
= coltype
.arguments
.first
1017 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
, objcla
.mclass_type
.as_nullable
])) then
1019 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
1020 var variables
= self.variables
1021 if variables
.length
!= 2 then
1022 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
1024 variables
[0].declared_type
= coltype
.arguments
[0]
1025 variables
[1].declared_type
= coltype
.arguments
[1]
1030 if not is_col
and not is_map
then
1031 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
1035 # anchor formal and virtual types
1036 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
1038 mtype
= mtype
.undecorate
1039 self.coltype
= mtype
.as(MClassType)
1041 # get methods is_ok, next, item
1042 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
1043 if ikdef
== null then
1044 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
1047 self.method_is_ok
= ikdef
1049 var itemdef
= v
.get_method
(self, ittype
, "item", false)
1050 if itemdef
== null then
1051 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
1054 self.method_item
= itemdef
1056 var nextdef
= v
.get_method
(self, ittype
, "next", false)
1057 if nextdef
== null then
1058 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
1061 self.method_next
= nextdef
1063 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
1066 var keydef
= v
.get_method
(self, ittype
, "key", false)
1067 if keydef
== null then
1068 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
1071 self.method_key
= keydef
1074 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
1075 var variable
= variables
.first
1076 var vtype
= variable
.declared_type
.as(not null)
1078 if n_expr
isa AOrangeExpr then
1079 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1081 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1084 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1088 redef fun accept_typing
(v
)
1090 var mtype
= v
.visit_expr
(n_expr
)
1091 if mtype
== null then return
1093 self.do_type_iterator
(v
, mtype
)
1095 v
.visit_stmt
(n_block
)
1096 self.mtype
= n_block
.mtype
1097 self.is_typed
= true
1101 redef class AAssertExpr
1102 redef fun accept_typing
(v
)
1104 v
.visit_expr_bool
(n_expr
)
1106 v
.visit_stmt
(n_else
)
1107 self.is_typed
= true
1112 redef fun accept_typing
(v
)
1114 v
.visit_expr_bool
(n_expr
)
1115 v
.visit_expr_bool
(n_expr2
)
1116 self.mtype
= v
.type_bool
(self)
1120 redef class AImpliesExpr
1121 redef fun accept_typing
(v
)
1123 v
.visit_expr_bool
(n_expr
)
1124 v
.visit_expr_bool
(n_expr2
)
1125 self.mtype
= v
.type_bool
(self)
1129 redef class AAndExpr
1130 redef fun accept_typing
(v
)
1132 v
.visit_expr_bool
(n_expr
)
1133 v
.visit_expr_bool
(n_expr2
)
1134 self.mtype
= v
.type_bool
(self)
1139 redef class ANotExpr
1140 redef fun accept_typing
(v
)
1142 v
.visit_expr_bool
(n_expr
)
1143 self.mtype
= v
.type_bool
(self)
1147 redef class AOrElseExpr
1148 redef fun accept_typing
(v
)
1150 var t1
= v
.visit_expr
(n_expr
)
1151 var t2
= v
.visit_expr
(n_expr2
)
1153 if t1
== null or t2
== null then
1157 if t1
isa MNullType then
1158 v
.error
(n_expr
, "Type error: or else on null")
1159 else if v
.check_can_be_null
(n_expr
, t1
) then
1163 var t
= v
.merge_types
(self, [t1
, t2
])
1165 t
= v
.mmodule
.object_type
1166 if v
.can_be_null
(t2
) then
1169 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1175 redef class ATrueExpr
1176 redef fun accept_typing
(v
)
1178 self.mtype
= v
.type_bool
(self)
1182 redef class AFalseExpr
1183 redef fun accept_typing
(v
)
1185 self.mtype
= v
.type_bool
(self)
1189 redef class AIntExpr
1190 redef fun accept_typing
(v
)
1192 var mclass
= v
.get_mclass
(self, "Int")
1193 if mclass
== null then return # Forward error
1194 self.mtype
= mclass
.mclass_type
1198 redef class AFloatExpr
1199 redef fun accept_typing
(v
)
1201 var mclass
= v
.get_mclass
(self, "Float")
1202 if mclass
== null then return # Forward error
1203 self.mtype
= mclass
.mclass_type
1207 redef class ACharExpr
1208 redef fun accept_typing
(v
)
1210 var mclass
= v
.get_mclass
(self, "Char")
1211 if mclass
== null then return # Forward error
1212 self.mtype
= mclass
.mclass_type
1216 redef class AStringFormExpr
1217 redef fun accept_typing
(v
)
1219 var mclass
= v
.get_mclass
(self, "String")
1220 if mclass
== null then return # Forward error
1221 self.mtype
= mclass
.mclass_type
1225 redef class ASuperstringExpr
1226 redef fun accept_typing
(v
)
1228 var mclass
= v
.get_mclass
(self, "String")
1229 if mclass
== null then return # Forward error
1230 self.mtype
= mclass
.mclass_type
1231 for nexpr
in self.n_exprs
do
1232 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1237 redef class AArrayExpr
1238 # The `with_capacity` method on Array
1239 var with_capacity_callsite
: nullable CallSite
1241 # The `push` method on arrays
1242 var push_callsite
: nullable CallSite
1244 # The element of each type
1245 var element_mtype
: nullable MType
1247 # Set that `self` is a part of comprehension array `na`
1248 # If `self` is a `for`, or a `if`, then `set_comprehension` is recursively applied.
1249 private fun set_comprehension
(n
: nullable AExpr)
1253 else if n
isa AForExpr then
1254 set_comprehension
(n
.n_block
)
1255 else if n
isa AIfExpr then
1256 set_comprehension
(n
.n_then
)
1257 set_comprehension
(n
.n_else
)
1260 n
.comprehension
= self
1263 redef fun accept_typing
(v
)
1265 var mtype
: nullable MType = null
1266 var ntype
= self.n_type
1267 if ntype
!= null then
1268 mtype
= v
.resolve_mtype
(ntype
)
1269 if mtype
== null then return # Skip error
1271 var mtypes
= new Array[nullable MType]
1273 for e
in self.n_exprs
do
1274 var t
= v
.visit_expr
(e
)
1278 set_comprehension
(e
)
1279 if mtype
!= null then
1280 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1281 if t
== mtype
then useless
= true
1286 if mtype
== null then
1287 mtype
= v
.merge_types
(self, mtypes
)
1289 if mtype
== null or mtype
isa MNullType then
1290 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1294 assert ntype
!= null
1295 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1298 self.element_mtype
= mtype
1300 var mclass
= v
.get_mclass
(self, "Array")
1301 if mclass
== null then return # Forward error
1302 var array_mtype
= mclass
.get_mtype
([mtype
])
1304 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1305 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1307 self.mtype
= array_mtype
1311 redef class ARangeExpr
1312 var init_callsite
: nullable CallSite
1314 redef fun accept_typing
(v
)
1316 var discrete_class
= v
.get_mclass
(self, "Discrete")
1317 if discrete_class
== null then return # Forward error
1318 var discrete_type
= discrete_class
.intro
.bound_mtype
1319 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1320 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1321 if t1
== null or t2
== null then return
1322 var mclass
= v
.get_mclass
(self, "Range")
1323 if mclass
== null then return # Forward error
1325 if v
.is_subtype
(t1
, t2
) then
1326 mtype
= mclass
.get_mtype
([t2
])
1327 else if v
.is_subtype
(t2
, t1
) then
1328 mtype
= mclass
.get_mtype
([t1
])
1330 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1336 # get the constructor
1338 if self isa ACrangeExpr then
1339 callsite
= v
.get_method
(self, mtype
, "init", false)
1340 else if self isa AOrangeExpr then
1341 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1345 init_callsite
= callsite
1349 redef class ANullExpr
1350 redef fun accept_typing
(v
)
1352 self.mtype
= v
.mmodule
.model
.null_type
1356 redef class AIsaExpr
1357 # The static type to cast to.
1358 # (different from the static type of the expression that is `Bool`).
1359 var cast_type
: nullable MType
1360 redef fun accept_typing
(v
)
1362 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1363 self.cast_type
= mtype
1365 var variable
= self.n_expr
.its_variable
1366 if variable
!= null then
1367 #var orig = self.n_expr.mtype
1368 #var from = if orig != null then orig.to_s else "invalid"
1369 #var to = if mtype != null then mtype.to_s else "invalid"
1370 #debug("adapt {variable}: {from} -> {to}")
1371 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1374 self.mtype
= v
.type_bool
(self)
1378 redef class AAsCastExpr
1379 redef fun accept_typing
(v
)
1381 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1385 redef class AAsNotnullExpr
1386 redef fun accept_typing
(v
)
1388 var mtype
= v
.visit_expr
(self.n_expr
)
1389 if mtype
== null then return # Forward error
1391 if mtype
isa MNullType then
1392 v
.error
(self, "Type error: as(not null) on null")
1396 if v
.check_can_be_null
(n_expr
, mtype
) then
1397 mtype
= mtype
.as_notnull
1404 redef class AParExpr
1405 redef fun accept_typing
(v
)
1407 self.mtype
= v
.visit_expr
(self.n_expr
)
1411 redef class AOnceExpr
1412 redef fun accept_typing
(v
)
1414 self.mtype
= v
.visit_expr
(self.n_expr
)
1418 redef class ASelfExpr
1419 redef var its_variable
: nullable Variable
1420 redef fun accept_typing
(v
)
1422 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1423 v
.error
(self, "Error: self cannot be used in top-level method.")
1425 var variable
= v
.selfvariable
1426 self.its_variable
= variable
1427 self.mtype
= v
.get_variable
(self, variable
)
1431 ## MESSAGE SENDING AND PROPERTY
1433 redef class ASendExpr
1434 # The property invoked by the send.
1435 var callsite
: nullable CallSite
1437 redef fun accept_typing
(v
)
1439 var recvtype
= v
.visit_expr
(self.n_expr
)
1440 var name
= self.property_name
1442 if recvtype
== null then return # Forward error
1444 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1445 if callsite
== null then return
1446 self.callsite
= callsite
1447 var msignature
= callsite
.msignature
1449 var args
= compute_raw_arguments
1451 callsite
.check_signature
(v
, args
)
1453 if callsite
.mproperty
.is_init
then
1454 var vmpropdef
= v
.mpropdef
1455 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1456 v
.error
(self, "Can call a init only in another init")
1458 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1459 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1463 var ret
= msignature
.return_mtype
1467 self.is_typed
= true
1471 # The name of the property
1472 # Each subclass simply provide the correct name.
1473 private fun property_name
: String is abstract
1475 # An array of all arguments (excluding self)
1476 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1478 private fun compute_raw_arguments
: Array[AExpr] is abstract
1481 redef class ABinopExpr
1482 redef fun compute_raw_arguments
do return [n_expr2
]
1485 redef fun property_name
do return "=="
1486 redef fun accept_typing
(v
)
1493 redef fun property_name
do return "!="
1494 redef fun accept_typing
(v
)
1501 redef fun property_name
do return "<"
1504 redef fun property_name
do return "<="
1507 redef fun property_name
do return "<<"
1510 redef fun property_name
do return ">"
1513 redef fun property_name
do return ">="
1516 redef fun property_name
do return ">>"
1518 redef class APlusExpr
1519 redef fun property_name
do return "+"
1521 redef class AMinusExpr
1522 redef fun property_name
do return "-"
1524 redef class AStarshipExpr
1525 redef fun property_name
do return "<=>"
1527 redef class AStarExpr
1528 redef fun property_name
do return "*"
1530 redef class AStarstarExpr
1531 redef fun property_name
do return "**"
1533 redef class ASlashExpr
1534 redef fun property_name
do return "/"
1536 redef class APercentExpr
1537 redef fun property_name
do return "%"
1540 redef class AUminusExpr
1541 redef fun property_name
do return "unary -"
1542 redef fun compute_raw_arguments
do return new Array[AExpr]
1546 redef class ACallExpr
1547 redef fun property_name
do return n_id
.text
1548 redef fun compute_raw_arguments
do return n_args
.to_a
1551 redef class ACallAssignExpr
1552 redef fun property_name
do return n_id
.text
+ "="
1553 redef fun compute_raw_arguments
1555 var res
= n_args
.to_a
1561 redef class ABraExpr
1562 redef fun property_name
do return "[]"
1563 redef fun compute_raw_arguments
do return n_args
.to_a
1566 redef class ABraAssignExpr
1567 redef fun property_name
do return "[]="
1568 redef fun compute_raw_arguments
1570 var res
= n_args
.to_a
1576 redef class ASendReassignFormExpr
1577 # The property invoked for the writing
1578 var write_callsite
: nullable CallSite
1580 redef fun accept_typing
(v
)
1582 var recvtype
= v
.visit_expr
(self.n_expr
)
1583 var name
= self.property_name
1585 if recvtype
== null then return # Forward error
1587 var for_self
= self.n_expr
isa ASelfExpr
1588 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1590 if callsite
== null then return
1591 self.callsite
= callsite
1593 var args
= compute_raw_arguments
1595 callsite
.check_signature
(v
, args
)
1597 var readtype
= callsite
.msignature
.return_mtype
1598 if readtype
== null then
1599 v
.error
(self, "Error: {name} is not a function")
1603 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1604 if wcallsite
== null then return
1605 self.write_callsite
= wcallsite
1607 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1608 if wtype
== null then return
1610 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1611 args
.add
(self.n_value
)
1612 wcallsite
.check_signature
(v
, args
)
1614 self.is_typed
= true
1618 redef class ACallReassignExpr
1619 redef fun property_name
do return n_id
.text
1620 redef fun compute_raw_arguments
do return n_args
.to_a
1623 redef class ABraReassignExpr
1624 redef fun property_name
do return "[]"
1625 redef fun compute_raw_arguments
do return n_args
.to_a
1628 redef class AInitExpr
1629 redef fun property_name
do return "init"
1630 redef fun compute_raw_arguments
do return n_args
.to_a
1634 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1639 redef class ASuperExpr
1640 # The method to call if the super is in fact a 'super init call'
1641 # Note: if the super is a normal call-next-method, then this attribute is null
1642 var callsite
: nullable CallSite
1644 # The method to call is the super is a standard `call-next-method` super-call
1645 # Note: if the super is a special super-init-call, then this attribute is null
1646 var mpropdef
: nullable MMethodDef
1648 redef fun accept_typing
(v
)
1650 var anchor
= v
.anchor
1651 assert anchor
!= null
1652 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1653 assert recvtype
!= null
1654 var mproperty
= v
.mpropdef
.mproperty
1655 if not mproperty
isa MMethod then
1656 v
.error
(self, "Error: super only usable in a method")
1659 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1660 if superprops
.length
== 0 then
1661 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1662 process_superinit
(v
)
1665 v
.error
(self, "Error: No super method to call for {mproperty}.")
1668 # FIXME: covariance of return type in linear extension?
1669 var superprop
= superprops
.first
1671 var msignature
= superprop
.msignature
.as(not null)
1672 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1673 var args
= self.n_args
.to_a
1674 if args
.length
> 0 then
1675 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1677 self.mtype
= msignature
.return_mtype
1678 self.is_typed
= true
1679 v
.mpropdef
.has_supercall
= true
1680 mpropdef
= v
.mpropdef
.as(MMethodDef)
1683 private fun process_superinit
(v
: TypeVisitor)
1685 var anchor
= v
.anchor
1686 assert anchor
!= null
1687 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1688 assert recvtype
!= null
1689 var mpropdef
= v
.mpropdef
1690 assert mpropdef
isa MMethodDef
1691 var mproperty
= mpropdef
.mproperty
1692 var superprop
: nullable MMethodDef = null
1693 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1694 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1695 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1696 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1697 if candidate
== null then
1698 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1699 continue # Try next super-class
1701 if superprop
!= null and candidate
.is_root_init
then
1704 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1705 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1708 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1709 if superprop
!= null and superprop
.mproperty
== candidate
then
1710 if superprop
== candidatedefs
.first
then continue
1711 candidatedefs
.add
(superprop
)
1713 if candidatedefs
.length
> 1 then
1714 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1717 superprop
= candidatedefs
.first
1719 if superprop
== null then
1720 v
.error
(self, "Error: No super method to call for {mproperty}.")
1724 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1725 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1727 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1728 self.callsite
= callsite
1730 var args
= self.n_args
.to_a
1731 if args
.length
> 0 then
1732 callsite
.check_signature
(v
, args
)
1734 # Check there is at least enough parameters
1735 if mpropdef
.msignature
.arity
< msignature
.arity
then
1736 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1739 # Check that each needed parameter is conform
1741 for sp
in msignature
.mparameters
do
1742 var p
= mpropdef
.msignature
.mparameters
[i
]
1743 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1744 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1751 self.is_typed
= true
1757 redef class ANewExpr
1758 # The constructor invoked by the new.
1759 var callsite
: nullable CallSite
1761 # The designated type
1762 var recvtype
: nullable MClassType
1764 redef fun accept_typing
(v
)
1766 var recvtype
= v
.resolve_mtype
(self.n_type
)
1767 if recvtype
== null then return
1769 if not recvtype
isa MClassType then
1770 if recvtype
isa MNullableType then
1771 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1774 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1779 self.recvtype
= recvtype
1788 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1789 if callsite
== null then return
1791 if not callsite
.mproperty
.is_new
then
1792 var kind
= recvtype
.mclass
.kind
1793 if kind
!= concrete_kind
then
1794 v
.error
(self, "Type Error: Cannot instantiate {kind} {recvtype}.")
1797 self.mtype
= recvtype
1799 self.mtype
= callsite
.msignature
.return_mtype
1800 assert self.mtype
!= null
1803 self.callsite
= callsite
1805 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1806 v
.error
(self, "Error: {name} is not a constructor.")
1810 var args
= n_args
.to_a
1811 callsite
.check_signature
(v
, args
)
1817 redef class AAttrFormExpr
1818 # The attribute acceded.
1819 var mproperty
: nullable MAttribute
1821 # The static type of the attribute.
1822 var attr_type
: nullable MType
1824 # Resolve the attribute acceded.
1825 private fun resolve_property
(v
: TypeVisitor)
1827 var recvtype
= v
.visit_expr
(self.n_expr
)
1828 if recvtype
== null then return # Skip error
1829 var name
= self.n_id
.text
1830 if recvtype
isa MNullType then
1831 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1835 var unsafe_type
= v
.anchor_to
(recvtype
)
1836 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1837 if mproperty
== null then
1838 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1841 assert mproperty
isa MAttribute
1842 self.mproperty
= mproperty
1844 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1845 assert mpropdefs
.length
== 1
1846 var mpropdef
= mpropdefs
.first
1847 var attr_type
= mpropdef
.static_mtype
.as(not null)
1848 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1849 self.attr_type
= attr_type
1853 redef class AAttrExpr
1854 redef fun accept_typing
(v
)
1856 self.resolve_property
(v
)
1857 self.mtype
= self.attr_type
1862 redef class AAttrAssignExpr
1863 redef fun accept_typing
(v
)
1865 self.resolve_property
(v
)
1866 var mtype
= self.attr_type
1868 v
.visit_expr_subtype
(self.n_value
, mtype
)
1869 self.is_typed
= true
1873 redef class AAttrReassignExpr
1874 redef fun accept_typing
(v
)
1876 self.resolve_property
(v
)
1877 var mtype
= self.attr_type
1878 if mtype
== null then return # Skip error
1880 self.resolve_reassignment
(v
, mtype
, mtype
)
1882 self.is_typed
= true
1886 redef class AIssetAttrExpr
1887 redef fun accept_typing
(v
)
1889 self.resolve_property
(v
)
1890 var mtype
= self.attr_type
1891 if mtype
== null then return # Skip error
1893 var recvtype
= self.n_expr
.mtype
.as(not null)
1894 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1895 if bound
isa MNullableType then
1896 v
.error
(self, "Error: isset on a nullable attribute.")
1898 self.mtype
= v
.type_bool
(self)
1902 redef class AVarargExpr
1903 redef fun accept_typing
(v
)
1905 # This kind of pseudo-expression can be only processed trough a signature
1906 # See `check_signature`
1907 # Other cases are a syntax error.
1908 v
.error
(self, "Syntax error: unexpected `...`")
1914 redef class ADebugTypeExpr
1915 redef fun accept_typing
(v
)
1917 var expr
= v
.visit_expr
(self.n_expr
)
1918 if expr
== null then return
1919 var unsafe
= v
.anchor_to
(expr
)
1920 var ntype
= self.n_type
1921 var mtype
= v
.resolve_mtype
(ntype
)
1922 if mtype
!= null and mtype
!= expr
then
1923 var umtype
= v
.anchor_to
(mtype
)
1924 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1926 self.is_typed
= true