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
44 # The analyzed mclassdef
45 var mclassdef
: nullable MClassDef
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
57 init(modelbuilder
: ModelBuilder, mmodule
: MModule, mpropdef
: nullable MPropDef)
59 self.modelbuilder
= modelbuilder
60 self.mmodule
= mmodule
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_toplevel
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 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
123 # Visit an expression and do not care about the return value
124 fun visit_stmt
(nexpr
: nullable AExpr)
126 if nexpr
== null then return
127 nexpr
.accept_typing
(self)
130 # Visit an expression and expects that it is not a statement
131 # Return the type of the expression
132 # Display an error and return null if:
133 # * the type cannot be determined or
134 # * `nexpr` is a statement
135 fun visit_expr
(nexpr
: AExpr): nullable MType
137 nexpr
.accept_typing
(self)
138 var mtype
= nexpr
.mtype
139 if mtype
!= null then return mtype
140 if not nexpr
.is_typed
then
141 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
142 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
143 nexpr
.debug
("No return type but no error.")
146 return null # forward error
148 self.error
(nexpr
, "Type error: expected expression.")
152 # Visit an expression and expect its static type is a least a `sup`
153 # Return the type of the expression or null if
154 # * the type cannot be determined or
155 # * `nexpr` is a statement or
156 # * `nexpr` is not a `sup`
157 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
159 var sub
= visit_expr
(nexpr
)
160 if sub
== null then return null # Forward error
162 if sup
== null then return null # Forward error
164 var res
= check_subtype
(nexpr
, sub
, sup
)
166 nexpr
.implicit_cast_to
= res
171 # Visit an expression and expect its static type is a `Bool`
172 # Return the type of the expression or null if
173 # * the type cannot be determined or
174 # * `nexpr` is a statement or
175 # * `nexpr` is not a `Bool`
176 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
178 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
182 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
184 var sub
= visit_expr
(nexpr
)
185 if sub
== null then return null # Forward error
187 var sup
= self.resolve_mtype
(ntype
)
188 if sup
== null then return null # Forward error
191 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup}.")
192 else if self.is_subtype
(sub
, sup
) then
193 self.modelbuilder
.warning
(node
, "useless-type-test", "Warning: Expression is already a {sup} since it is a {sub}.")
198 # Special verification on != and == for null
200 fun null_test
(anode
: ABinopExpr)
202 var mtype
= anode
.n_expr
.mtype
203 var mtype2
= anode
.n_expr2
.mtype
205 if mtype
== null or mtype2
== null then return
207 if not mtype2
isa MNullType then return
209 # Check of useless null
210 if not mtype
isa MNullableType then
211 if not anchor_to
(mtype
) isa MNullableType then
212 modelbuilder
.warning
(anode
, "useless-null-test", "Warning: expression is not null, since it is a `{mtype}`.")
217 # Check for type adaptation
218 var variable
= anode
.n_expr
.its_variable
219 if variable
== null then return
221 if anode
isa AEqExpr then
222 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype2
)
223 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype
.mtype
)
224 else if anode
isa ANeExpr then
225 anode
.after_flow_context
.when_false
.set_var
(variable
, mtype2
)
226 anode
.after_flow_context
.when_true
.set_var
(variable
, mtype
.mtype
)
232 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
234 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, mmodule
, mtype
, name
)
237 fun resolve_mtype
(node
: AType): nullable MType
239 return self.modelbuilder
.resolve_mtype
(mmodule
, mclassdef
, node
)
242 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
244 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
248 fun get_mclass
(node
: ANode, name
: String): nullable MClass
250 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
251 if mclass
== null then
252 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
257 fun type_bool
(node
: ANode): nullable MType
259 var mclass
= self.get_mclass
(node
, "Bool")
260 if mclass
== null then return null
261 return mclass
.mclass_type
264 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
266 var unsafe_type
= self.anchor_to
(recvtype
)
268 #debug("recv: {recvtype} (aka {unsafe_type})")
269 if recvtype
isa MNullType then
270 self.error
(node
, "Error: Method '{name}' call on 'null'.")
274 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
275 if mproperty
== null then
276 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
278 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
280 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
285 assert mproperty
isa MMethod
287 if is_toplevel_context
and recv_is_self
and not mproperty
.is_toplevel
then
288 error
(node
, "Error: '{name}' is not a top-level method, thus need a receiver.")
290 if not recv_is_self
and mproperty
.is_toplevel
then
291 error
(node
, "Error: cannot call '{name}', a top-level method, with a receiver.")
294 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
295 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self.")
299 var info
= mproperty
.deprecation
300 if info
!= null and self.mpropdef
.mproperty
.deprecation
== null then
303 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated: {mdoc.content.first}")
305 self.modelbuilder
.warning
(node
, "deprecated-method", "Deprecation Warning: Method '{name}' is deprecated.")
309 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
311 if propdefs
.length
== 0 then
312 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
314 else if propdefs
.length
== 1 then
315 mpropdef
= propdefs
.first
317 self.modelbuilder
.warning
(node
, "property-conflict", "Warning: conflicting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
318 mpropdef
= mproperty
.intro
322 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
323 msignature
= resolve_for
(msignature
, recvtype
, recv_is_self
).as(MSignature)
325 var erasure_cast
= false
326 var rettype
= mpropdef
.msignature
.return_mtype
327 if not recv_is_self
and rettype
!= null then
328 rettype
= rettype
.as_notnullable
329 if rettype
isa MParameterType then
330 var erased_rettype
= msignature
.return_mtype
331 assert erased_rettype
!= null
332 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
337 var callsite
= new CallSite(node
, recvtype
, mmodule
, anchor
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
341 fun try_get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
343 var unsafe_type
= self.anchor_to
(recvtype
)
344 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
345 if mproperty
== null then return null
346 return get_method
(node
, recvtype
, name
, recv_is_self
)
350 # Visit the expressions of args and check their conformity with the corresponding type in signature
351 # The point of this method is to handle varargs correctly
352 # Note: The signature must be correctly adapted
353 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
355 var vararg_rank
= msignature
.vararg_rank
356 if vararg_rank
>= 0 then
357 if args
.length
< msignature
.arity
then
358 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
359 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
362 else if args
.length
!= msignature
.arity
then
363 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
367 #debug("CALL {unsafe_type}.{msignature}")
369 var vararg_decl
= args
.length
- msignature
.arity
370 for i
in [0..msignature
.arity
[ do
372 if i
== vararg_rank
then continue # skip the vararg
373 if i
> vararg_rank
then
376 var paramtype
= msignature
.mparameters
[i
].mtype
377 self.visit_expr_subtype
(args
[j
], paramtype
)
379 if vararg_rank
>= 0 then
380 var varargs
= new Array[AExpr]
381 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
382 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
384 self.visit_expr_subtype
(args
[j
], paramtype
)
390 fun error
(node
: ANode, message
: String)
392 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
395 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
397 var flow
= node
.after_flow_context
399 self.error
(node
, "No context!")
403 if flow
.vars
.has_key
(variable
) then
404 return flow
.vars
[variable
]
406 #node.debug("*** START Collected for {variable}")
407 var mtypes
= flow
.collect_types
(variable
)
408 #node.debug("**** END Collected for {variable}")
409 if mtypes
== null or mtypes
.length
== 0 then
410 return variable
.declared_type
411 else if mtypes
.length
== 1 then
414 var res
= merge_types
(node
,mtypes
)
415 if res
== null then res
= variable
.declared_type
421 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
423 var flow
= node
.after_flow_context
426 flow
.set_var
(variable
, mtype
)
429 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
431 if col
.length
== 1 then return col
.first
433 if t1
== null then continue # return null
436 if t2
== null then continue # return null
437 if t2
isa MNullableType or t2
isa MNullType then
440 if not is_subtype
(t2
, t1
) then found
= false
443 #print "merge {col.join(" ")} -> {t1}"
447 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
452 # A specific method call site with its associated informations.
454 # The associated node for location
457 # The static type of the receiver (possibly unresolved)
460 # The module where the callsite is present
463 # The anchor to use with `recv` or `msignature`
464 var anchor
: nullable MClassType
466 # Is the receiver self?
467 # If "for_self", virtual types of the signature are kept
468 # If "not_for_self", virtual type are erased
469 var recv_is_self
: Bool
471 # The designated method
472 var mproperty
: MMethod
474 # The statically designated method definition
475 # The most specif one, it is.
476 var mpropdef
: MMethodDef
478 # The resolved signature for the receiver
479 var msignature
: MSignature
481 # Is a implicit cast required on erasure typing policy?
482 var erasure_cast
: Bool
484 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
486 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
491 # The declared type of the variable
492 var declared_type
: nullable MType
495 redef class FlowContext
496 # Store changes of types because of type evolution
497 private var vars
= new HashMap[Variable, nullable MType]
498 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
500 # Adapt the variable to a static type
501 # Warning1: do not modify vars directly.
502 # Warning2: sub-flow may have cached a unadapted variable
503 private fun set_var
(variable
: Variable, mtype
: nullable MType)
505 self.vars
[variable
] = mtype
506 self.cache
.keys
.remove
(variable
)
509 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
511 if cache
.has_key
(variable
) then
512 return cache
[variable
]
514 var res
: nullable Array[nullable MType] = null
515 if vars
.has_key
(variable
) then
516 var mtype
= vars
[variable
]
518 else if self.previous
.is_empty
then
520 res
= [variable
.declared_type
]
522 for flow
in self.previous
do
523 if flow
.is_unreachable
then continue
524 var r2
= flow
.collect_types
(variable
)
525 if r2
== null then continue
530 if not res
.has
(t
) then res
.add
(t
)
535 cache
[variable
] = res
541 # The entry point of the whole typing analysis
542 fun do_typing
(modelbuilder
: ModelBuilder)
546 # The variable associated to the receiver (if any)
547 var selfvariable
: nullable Variable
550 redef class AMethPropdef
551 redef fun do_typing
(modelbuilder
: ModelBuilder)
553 var nblock
= self.n_block
554 if nblock
== null then return
556 var mpropdef
= self.mpropdef
.as(not null)
557 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
558 self.selfvariable
= v
.selfvariable
560 var mmethoddef
= self.mpropdef
.as(not null)
561 for i
in [0..mmethoddef
.msignature
.arity
[ do
562 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
563 if mmethoddef
.msignature
.vararg_rank
== i
then
564 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
565 if arrayclass
== null then return # Skip error
566 mtype
= arrayclass
.get_mtype
([mtype
])
568 var variable
= self.n_signature
.n_params
[i
].variable
569 assert variable
!= null
570 variable
.declared_type
= mtype
574 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
575 # We reach the end of the function without having a return, it is bad
576 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
581 redef class AAttrPropdef
582 redef fun do_typing
(modelbuilder
: ModelBuilder)
584 var mpropdef
= self.mpropdef
.as(not null)
585 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
586 self.selfvariable
= v
.selfvariable
588 var nexpr
= self.n_expr
589 if nexpr
!= null then
590 var mtype
= self.mpropdef
.static_mtype
591 v
.visit_expr_subtype
(nexpr
, mtype
)
599 # The static type of the expression.
600 # null if self is a statement or in case of error
601 var mtype
: nullable MType = null
603 # Is the statement correctly typed?
604 # Used to distinguish errors and statements when `mtype == null`
605 var is_typed
: Bool = false
607 # If required, the following implicit cast `.as(XXX)`
608 # Such a cast may by required after evaluating the expression when
609 # a unsafe operation is detected (silently accepted by the Nit language).
610 # The attribute is computed by `check_subtype`
611 var implicit_cast_to
: nullable MType = null
613 # Return the variable read (if any)
614 # Used to perform adaptive typing
615 fun its_variable
: nullable Variable do return null
617 private fun accept_typing
(v
: TypeVisitor)
619 v
.error
(self, "no implemented accept_typing for {self.class_name}")
623 redef class ABlockExpr
624 redef fun accept_typing
(v
)
626 for e
in self.n_expr
do v
.visit_stmt
(e
)
630 # The type of a blockexpr is the one of the last expression (or null if empty)
633 if self.n_expr
.is_empty
then return null
634 return self.n_expr
.last
.mtype
638 redef class AVardeclExpr
639 redef fun accept_typing
(v
)
641 var variable
= self.variable
642 if variable
== null then return # Skip error
644 var ntype
= self.n_type
645 var mtype
: nullable MType
646 if ntype
== null then
649 mtype
= v
.resolve_mtype
(ntype
)
650 if mtype
== null then return # Skip error
653 var nexpr
= self.n_expr
654 if nexpr
!= null then
655 if mtype
!= null then
656 v
.visit_expr_subtype
(nexpr
, mtype
)
658 mtype
= v
.visit_expr
(nexpr
)
659 if mtype
== null then return # Skip error
664 if mtype
== null or mtype
isa MNullType then
665 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
666 if mtype
== null then mtype
= decltype
669 variable
.declared_type
= decltype
670 v
.set_variable
(self, variable
, mtype
)
672 #debug("var {variable}: {mtype}")
679 redef fun its_variable
do return self.variable
680 redef fun accept_typing
(v
)
682 var variable
= self.variable
683 if variable
== null then return # Skip error
685 var mtype
= v
.get_variable
(self, variable
)
686 if mtype
!= null then
687 #debug("{variable} is {mtype}")
689 #debug("{variable} is untyped")
696 redef class AVarAssignExpr
697 redef fun accept_typing
(v
)
699 var variable
= self.variable
700 assert variable
!= null
702 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
704 v
.set_variable
(self, variable
, mtype
)
710 redef class AReassignFormExpr
711 # The method designed by the reassign operator.
712 var reassign_callsite
: nullable CallSite
714 var read_type
: nullable MType = null
716 # Determine the `reassign_property`
717 # `readtype` is the type of the reading of the left value.
718 # `writetype` is the type of the writing of the left value.
719 # (Because of `ACallReassignExpr`, both can be different.
720 # Return the static type of the value to store.
721 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
723 var reassign_name
: String
724 if self.n_assign_op
isa APlusAssignOp then
726 else if self.n_assign_op
isa AMinusAssignOp then
732 self.read_type
= readtype
734 if readtype
isa MNullType then
735 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
739 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
740 if callsite
== null then return null # Skip error
741 self.reassign_callsite
= callsite
743 var msignature
= callsite
.msignature
744 var rettype
= msignature
.return_mtype
745 assert msignature
.arity
== 1 and rettype
!= null
747 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
748 if value_type
== null then return null # Skip error
750 v
.check_subtype
(self, rettype
, writetype
)
755 redef class AVarReassignExpr
756 redef fun accept_typing
(v
)
758 var variable
= self.variable
759 assert variable
!= null
761 var readtype
= v
.get_variable
(self, variable
)
762 if readtype
== null then return
766 var writetype
= variable
.declared_type
767 if writetype
== null then return
769 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
771 v
.set_variable
(self, variable
, rettype
)
778 redef class AContinueExpr
779 redef fun accept_typing
(v
)
781 var nexpr
= self.n_expr
782 if nexpr
!= null then
789 redef class ABreakExpr
790 redef fun accept_typing
(v
)
792 var nexpr
= self.n_expr
793 if nexpr
!= null then
800 redef class AReturnExpr
801 redef fun accept_typing
(v
)
803 var nexpr
= self.n_expr
804 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
805 if nexpr
!= null then
806 if ret_type
!= null then
807 v
.visit_expr_subtype
(nexpr
, ret_type
)
810 v
.error
(self, "Error: Return with value in a procedure.")
812 else if ret_type
!= null then
813 v
.error
(self, "Error: Return without value in a function.")
819 redef class AAbortExpr
820 redef fun accept_typing
(v
)
827 redef fun accept_typing
(v
)
829 v
.visit_expr_bool
(n_expr
)
837 redef class AIfexprExpr
838 redef fun accept_typing
(v
)
840 v
.visit_expr_bool
(n_expr
)
842 var t1
= v
.visit_expr
(n_then
)
843 var t2
= v
.visit_expr
(n_else
)
845 if t1
== null or t2
== null then
849 var t
= v
.merge_types
(self, [t1
, t2
])
851 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
858 redef fun accept_typing
(v
)
860 v
.visit_stmt
(n_block
)
865 redef class AWhileExpr
866 redef fun accept_typing
(v
)
868 v
.visit_expr_bool
(n_expr
)
870 v
.visit_stmt
(n_block
)
875 redef class ALoopExpr
876 redef fun accept_typing
(v
)
878 v
.visit_stmt
(n_block
)
884 var coltype
: nullable MClassType
886 var method_iterator
: nullable CallSite
887 var method_is_ok
: nullable CallSite
888 var method_item
: nullable CallSite
889 var method_next
: nullable CallSite
890 var method_key
: nullable CallSite
891 var method_finish
: nullable CallSite
893 var method_lt
: nullable CallSite
894 var method_successor
: nullable CallSite
896 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
898 if mtype
isa MNullType then
899 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
904 var objcla
= v
.get_mclass
(self, "Object")
905 if objcla
== null then return
907 # check iterator method
908 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
909 if itdef
== null then
910 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
913 self.method_iterator
= itdef
915 # check that iterator return something
916 var ittype
= itdef
.msignature
.return_mtype
917 if ittype
== null then
918 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
923 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
924 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
928 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
930 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
931 var variables
= self.variables
932 if variables
.length
!= 1 then
933 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
935 variables
.first
.declared_type
= coltype
.arguments
.first
940 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
942 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
943 var variables
= self.variables
944 if variables
.length
!= 2 then
945 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
947 variables
[0].declared_type
= coltype
.arguments
[0]
948 variables
[1].declared_type
= coltype
.arguments
[1]
953 if not is_col
and not is_map
then
954 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
958 # anchor formal and virtual types
959 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
961 mtype
= mtype
.as_notnullable
962 self.coltype
= mtype
.as(MClassType)
964 # get methods is_ok, next, item
965 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
966 if ikdef
== null then
967 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
970 self.method_is_ok
= ikdef
972 var itemdef
= v
.get_method
(self, ittype
, "item", false)
973 if itemdef
== null then
974 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
977 self.method_item
= itemdef
979 var nextdef
= v
.get_method
(self, ittype
, "next", false)
980 if nextdef
== null then
981 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
984 self.method_next
= nextdef
986 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
989 var keydef
= v
.get_method
(self, ittype
, "key", false)
990 if keydef
== null then
991 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
994 self.method_key
= keydef
997 if self.variables
.length
== 1 and n_expr
isa ARangeExpr then
998 var variable
= variables
.first
999 var vtype
= variable
.declared_type
.as(not null)
1001 if n_expr
isa AOrangeExpr then
1002 self.method_lt
= v
.get_method
(self, vtype
, "<", false)
1004 self.method_lt
= v
.get_method
(self, vtype
, "<=", false)
1007 self.method_successor
= v
.get_method
(self, vtype
, "successor", false)
1011 redef fun accept_typing
(v
)
1013 var mtype
= v
.visit_expr
(n_expr
)
1014 if mtype
== null then return
1016 self.do_type_iterator
(v
, mtype
)
1018 v
.visit_stmt
(n_block
)
1019 self.is_typed
= true
1023 redef class AAssertExpr
1024 redef fun accept_typing
(v
)
1026 v
.visit_expr_bool
(n_expr
)
1028 v
.visit_stmt
(n_else
)
1029 self.is_typed
= true
1034 redef fun accept_typing
(v
)
1036 v
.visit_expr_bool
(n_expr
)
1037 v
.visit_expr_bool
(n_expr2
)
1038 self.mtype
= v
.type_bool
(self)
1042 redef class AImpliesExpr
1043 redef fun accept_typing
(v
)
1045 v
.visit_expr_bool
(n_expr
)
1046 v
.visit_expr_bool
(n_expr2
)
1047 self.mtype
= v
.type_bool
(self)
1051 redef class AAndExpr
1052 redef fun accept_typing
(v
)
1054 v
.visit_expr_bool
(n_expr
)
1055 v
.visit_expr_bool
(n_expr2
)
1056 self.mtype
= v
.type_bool
(self)
1061 redef class ANotExpr
1062 redef fun accept_typing
(v
)
1064 v
.visit_expr_bool
(n_expr
)
1065 self.mtype
= v
.type_bool
(self)
1069 redef class AOrElseExpr
1070 redef fun accept_typing
(v
)
1072 var t1
= v
.visit_expr
(n_expr
)
1073 var t2
= v
.visit_expr
(n_expr2
)
1075 if t1
== null or t2
== null then
1079 t1
= t1
.as_notnullable
1081 var t
= v
.merge_types
(self, [t1
, t2
])
1083 t
= v
.mmodule
.object_type
1084 if t2
isa MNullableType then
1087 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1093 redef class ATrueExpr
1094 redef fun accept_typing
(v
)
1096 self.mtype
= v
.type_bool
(self)
1100 redef class AFalseExpr
1101 redef fun accept_typing
(v
)
1103 self.mtype
= v
.type_bool
(self)
1107 redef class AIntExpr
1108 redef fun accept_typing
(v
)
1110 var mclass
= v
.get_mclass
(self, "Int")
1111 if mclass
== null then return # Forward error
1112 self.mtype
= mclass
.mclass_type
1116 redef class AFloatExpr
1117 redef fun accept_typing
(v
)
1119 var mclass
= v
.get_mclass
(self, "Float")
1120 if mclass
== null then return # Forward error
1121 self.mtype
= mclass
.mclass_type
1125 redef class ACharExpr
1126 redef fun accept_typing
(v
)
1128 var mclass
= v
.get_mclass
(self, "Char")
1129 if mclass
== null then return # Forward error
1130 self.mtype
= mclass
.mclass_type
1134 redef class AStringFormExpr
1135 redef fun accept_typing
(v
)
1137 var mclass
= v
.get_mclass
(self, "String")
1138 if mclass
== null then return # Forward error
1139 self.mtype
= mclass
.mclass_type
1143 redef class ASuperstringExpr
1144 redef fun accept_typing
(v
)
1146 var mclass
= v
.get_mclass
(self, "String")
1147 if mclass
== null then return # Forward error
1148 self.mtype
= mclass
.mclass_type
1149 for nexpr
in self.n_exprs
do
1150 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1155 redef class AArrayExpr
1156 var with_capacity_callsite
: nullable CallSite
1157 var push_callsite
: nullable CallSite
1159 redef fun accept_typing
(v
)
1161 var mtype
: nullable MType = null
1162 var ntype
= self.n_type
1163 if ntype
!= null then
1164 mtype
= v
.resolve_mtype
(ntype
)
1165 if mtype
== null then return # Skip error
1167 var mtypes
= new Array[nullable MType]
1169 for e
in self.n_exprs
.n_exprs
do
1170 var t
= v
.visit_expr
(e
)
1174 if mtype
!= null then
1175 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1176 if t
== mtype
then useless
= true
1181 if mtype
== null then
1182 mtype
= v
.merge_types
(self, mtypes
)
1184 if mtype
== null then
1185 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1189 assert ntype
!= null
1190 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1192 var mclass
= v
.get_mclass
(self, "Array")
1193 if mclass
== null then return # Forward error
1194 var array_mtype
= mclass
.get_mtype
([mtype
])
1196 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1197 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1199 self.mtype
= array_mtype
1203 redef class ARangeExpr
1204 var init_callsite
: nullable CallSite
1206 redef fun accept_typing
(v
)
1208 var discrete_class
= v
.get_mclass
(self, "Discrete")
1209 if discrete_class
== null then return # Forward error
1210 var discrete_type
= discrete_class
.intro
.bound_mtype
1211 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1212 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1213 if t1
== null or t2
== null then return
1214 var mclass
= v
.get_mclass
(self, "Range")
1215 if mclass
== null then return # Forward error
1217 if v
.is_subtype
(t1
, t2
) then
1218 mtype
= mclass
.get_mtype
([t2
])
1219 else if v
.is_subtype
(t2
, t1
) then
1220 mtype
= mclass
.get_mtype
([t1
])
1222 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1228 # get the constructor
1230 if self isa ACrangeExpr then
1231 callsite
= v
.get_method
(self, mtype
, "init", false)
1232 else if self isa AOrangeExpr then
1233 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1237 init_callsite
= callsite
1241 redef class ANullExpr
1242 redef fun accept_typing
(v
)
1244 self.mtype
= v
.mmodule
.model
.null_type
1248 redef class AIsaExpr
1249 # The static type to cast to.
1250 # (different from the static type of the expression that is `Bool`).
1251 var cast_type
: nullable MType
1252 redef fun accept_typing
(v
)
1254 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1255 self.cast_type
= mtype
1257 var variable
= self.n_expr
.its_variable
1258 if variable
!= null then
1259 #var orig = self.n_expr.mtype
1260 #var from = if orig != null then orig.to_s else "invalid"
1261 #var to = if mtype != null then mtype.to_s else "invalid"
1262 #debug("adapt {variable}: {from} -> {to}")
1263 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1266 self.mtype
= v
.type_bool
(self)
1270 redef class AAsCastExpr
1271 redef fun accept_typing
(v
)
1273 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1277 redef class AAsNotnullExpr
1278 redef fun accept_typing
(v
)
1280 var mtype
= v
.visit_expr
(self.n_expr
)
1281 if mtype
== null then return # Forward error
1283 if mtype
isa MNullType then
1284 v
.error
(self, "Type error: as(not null) on null")
1287 if mtype
isa MNullableType then
1288 self.mtype
= mtype
.mtype
1293 if mtype
isa MClassType then
1294 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1297 assert mtype
.need_anchor
1298 var u
= v
.anchor_to
(mtype
)
1299 if not u
isa MNullableType then
1300 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1306 redef class AProxyExpr
1307 redef fun accept_typing
(v
)
1309 self.mtype
= v
.visit_expr
(self.n_expr
)
1313 redef class ASelfExpr
1314 redef var its_variable
: nullable Variable
1315 redef fun accept_typing
(v
)
1317 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1318 v
.error
(self, "Error: self cannot be used in top-level method.")
1320 var variable
= v
.selfvariable
1321 self.its_variable
= variable
1322 self.mtype
= v
.get_variable
(self, variable
)
1326 ## MESSAGE SENDING AND PROPERTY
1328 redef class ASendExpr
1329 # The property invoked by the send.
1330 var callsite
: nullable CallSite
1332 redef fun accept_typing
(v
)
1334 var recvtype
= v
.visit_expr
(self.n_expr
)
1335 var name
= self.property_name
1337 if recvtype
== null then return # Forward error
1338 if recvtype
isa MNullType then
1339 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1343 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1344 if callsite
== null then return
1345 self.callsite
= callsite
1346 var msignature
= callsite
.msignature
1348 var args
= compute_raw_arguments
1350 callsite
.check_signature
(v
, args
)
1352 if callsite
.mproperty
.is_init
then
1353 var vmpropdef
= v
.mpropdef
1354 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1355 v
.error
(self, "Can call a init only in another init")
1357 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1358 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1362 var ret
= msignature
.return_mtype
1366 self.is_typed
= true
1370 # The name of the property
1371 # Each subclass simply provide the correct name.
1372 private fun property_name
: String is abstract
1374 # An array of all arguments (excluding self)
1375 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1377 private fun compute_raw_arguments
: Array[AExpr] is abstract
1380 redef class ABinopExpr
1381 redef fun compute_raw_arguments
do return [n_expr2
]
1384 redef fun property_name
do return "=="
1385 redef fun accept_typing
(v
)
1392 redef fun property_name
do return "!="
1393 redef fun accept_typing
(v
)
1400 redef fun property_name
do return "<"
1403 redef fun property_name
do return "<="
1406 redef fun property_name
do return "<<"
1409 redef fun property_name
do return ">"
1412 redef fun property_name
do return ">="
1415 redef fun property_name
do return ">>"
1417 redef class APlusExpr
1418 redef fun property_name
do return "+"
1420 redef class AMinusExpr
1421 redef fun property_name
do return "-"
1423 redef class AStarshipExpr
1424 redef fun property_name
do return "<=>"
1426 redef class AStarExpr
1427 redef fun property_name
do return "*"
1429 redef class AStarstarExpr
1430 redef fun property_name
do return "**"
1432 redef class ASlashExpr
1433 redef fun property_name
do return "/"
1435 redef class APercentExpr
1436 redef fun property_name
do return "%"
1439 redef class AUminusExpr
1440 redef fun property_name
do return "unary -"
1441 redef fun compute_raw_arguments
do return new Array[AExpr]
1445 redef class ACallExpr
1446 redef fun property_name
do return n_id
.text
1447 redef fun compute_raw_arguments
do return n_args
.to_a
1450 redef class ACallAssignExpr
1451 redef fun property_name
do return n_id
.text
+ "="
1452 redef fun compute_raw_arguments
1454 var res
= n_args
.to_a
1460 redef class ABraExpr
1461 redef fun property_name
do return "[]"
1462 redef fun compute_raw_arguments
do return n_args
.to_a
1465 redef class ABraAssignExpr
1466 redef fun property_name
do return "[]="
1467 redef fun compute_raw_arguments
1469 var res
= n_args
.to_a
1475 redef class ASendReassignFormExpr
1476 # The property invoked for the writing
1477 var write_callsite
: nullable CallSite
1479 redef fun accept_typing
(v
)
1481 var recvtype
= v
.visit_expr
(self.n_expr
)
1482 var name
= self.property_name
1484 if recvtype
== null then return # Forward error
1485 if recvtype
isa MNullType then
1486 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1490 var for_self
= self.n_expr
isa ASelfExpr
1491 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1493 if callsite
== null then return
1494 self.callsite
= callsite
1496 var args
= compute_raw_arguments
1498 callsite
.check_signature
(v
, args
)
1500 var readtype
= callsite
.msignature
.return_mtype
1501 if readtype
== null then
1502 v
.error
(self, "Error: {name} is not a function")
1506 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1507 if wcallsite
== null then return
1508 self.write_callsite
= wcallsite
1510 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1511 if wtype
== null then return
1513 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1514 args
.add
(self.n_value
)
1515 wcallsite
.check_signature
(v
, args
)
1517 self.is_typed
= true
1521 redef class ACallReassignExpr
1522 redef fun property_name
do return n_id
.text
1523 redef fun compute_raw_arguments
do return n_args
.to_a
1526 redef class ABraReassignExpr
1527 redef fun property_name
do return "[]"
1528 redef fun compute_raw_arguments
do return n_args
.to_a
1531 redef class AInitExpr
1532 redef fun property_name
do return "init"
1533 redef fun compute_raw_arguments
do return n_args
.to_a
1537 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1542 redef class ASuperExpr
1543 # The method to call if the super is in fact a 'super init call'
1544 # Note: if the super is a normal call-next-method, then this attribute is null
1545 var callsite
: nullable CallSite
1547 # The method to call is the super is a standard `call-next-method` super-call
1548 # Note: if the super is a special super-init-call, then this attribute is null
1549 var mpropdef
: nullable MMethodDef
1551 redef fun accept_typing
(v
)
1553 var anchor
= v
.anchor
1554 assert anchor
!= null
1555 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1556 assert recvtype
!= null
1557 var mproperty
= v
.mpropdef
.mproperty
1558 if not mproperty
isa MMethod then
1559 v
.error
(self, "Error: super only usable in a method")
1562 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1563 if superprops
.length
== 0 then
1564 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1565 process_superinit
(v
)
1568 v
.error
(self, "Error: No super method to call for {mproperty}.")
1571 # FIXME: covariance of return type in linear extension?
1572 var superprop
= superprops
.first
1574 var msignature
= superprop
.msignature
.as(not null)
1575 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1576 var args
= self.n_args
.to_a
1577 if args
.length
> 0 then
1578 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1580 self.mtype
= msignature
.return_mtype
1581 self.is_typed
= true
1582 v
.mpropdef
.has_supercall
= true
1583 mpropdef
= v
.mpropdef
.as(MMethodDef)
1586 private fun process_superinit
(v
: TypeVisitor)
1588 var anchor
= v
.anchor
1589 assert anchor
!= null
1590 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1591 assert recvtype
!= null
1592 var mpropdef
= v
.mpropdef
1593 assert mpropdef
isa MMethodDef
1594 var mproperty
= mpropdef
.mproperty
1595 var superprop
: nullable MMethodDef = null
1596 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1597 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1598 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1599 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1600 if candidate
== null then
1601 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1602 continue # Try next super-class
1604 if superprop
!= null and candidate
.is_root_init
then
1607 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1608 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1611 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1612 if superprop
!= null and superprop
.mproperty
== candidate
then
1613 if superprop
== candidatedefs
.first
then continue
1614 candidatedefs
.add
(superprop
)
1616 if candidatedefs
.length
> 1 then
1617 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1620 superprop
= candidatedefs
.first
1622 if superprop
== null then
1623 v
.error
(self, "Error: No super method to call for {mproperty}.")
1627 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1628 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1630 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1631 self.callsite
= callsite
1633 var args
= self.n_args
.to_a
1634 if args
.length
> 0 then
1635 callsite
.check_signature
(v
, args
)
1637 # Check there is at least enough parameters
1638 if mpropdef
.msignature
.arity
< msignature
.arity
then
1639 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1642 # Check that each needed parameter is conform
1644 for sp
in msignature
.mparameters
do
1645 var p
= mpropdef
.msignature
.mparameters
[i
]
1646 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1647 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1654 self.is_typed
= true
1660 redef class ANewExpr
1661 # The constructor invoked by the new.
1662 var callsite
: nullable CallSite
1664 redef fun accept_typing
(v
)
1666 var recvtype
= v
.resolve_mtype
(self.n_type
)
1667 if recvtype
== null then return
1668 self.mtype
= recvtype
1670 if not recvtype
isa MClassType then
1671 if recvtype
isa MNullableType then
1672 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1675 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1679 if recvtype
.mclass
.kind
== abstract_kind
then
1680 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1682 else if recvtype
.mclass
.kind
== interface_kind
then
1683 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1695 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1696 if callsite
== null then return
1698 self.callsite
= callsite
1700 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1701 v
.error
(self, "Error: {name} is not a constructor.")
1705 var args
= n_args
.to_a
1706 callsite
.check_signature
(v
, args
)
1712 redef class AAttrFormExpr
1713 # The attribute acceded.
1714 var mproperty
: nullable MAttribute
1716 # The static type of the attribute.
1717 var attr_type
: nullable MType
1719 # Resolve the attribute acceded.
1720 private fun resolve_property
(v
: TypeVisitor)
1722 var recvtype
= v
.visit_expr
(self.n_expr
)
1723 if recvtype
== null then return # Skip error
1724 var name
= self.n_id
.text
1725 if recvtype
isa MNullType then
1726 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1730 var unsafe_type
= v
.anchor_to
(recvtype
)
1731 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1732 if mproperty
== null then
1733 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1736 assert mproperty
isa MAttribute
1737 self.mproperty
= mproperty
1739 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1740 assert mpropdefs
.length
== 1
1741 var mpropdef
= mpropdefs
.first
1742 var attr_type
= mpropdef
.static_mtype
.as(not null)
1743 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1744 self.attr_type
= attr_type
1748 redef class AAttrExpr
1749 redef fun accept_typing
(v
)
1751 self.resolve_property
(v
)
1752 self.mtype
= self.attr_type
1757 redef class AAttrAssignExpr
1758 redef fun accept_typing
(v
)
1760 self.resolve_property
(v
)
1761 var mtype
= self.attr_type
1763 v
.visit_expr_subtype
(self.n_value
, mtype
)
1764 self.is_typed
= true
1768 redef class AAttrReassignExpr
1769 redef fun accept_typing
(v
)
1771 self.resolve_property
(v
)
1772 var mtype
= self.attr_type
1773 if mtype
== null then return # Skip error
1775 self.resolve_reassignment
(v
, mtype
, mtype
)
1777 self.is_typed
= true
1781 redef class AIssetAttrExpr
1782 redef fun accept_typing
(v
)
1784 self.resolve_property
(v
)
1785 var mtype
= self.attr_type
1786 if mtype
== null then return # Skip error
1788 var recvtype
= self.n_expr
.mtype
.as(not null)
1789 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1790 if bound
isa MNullableType then
1791 v
.error
(self, "Error: isset on a nullable attribute.")
1793 self.mtype
= v
.type_bool
(self)
1799 redef class ADebugTypeExpr
1800 redef fun accept_typing
(v
)
1802 var expr
= v
.visit_expr
(self.n_expr
)
1803 if expr
== null then return
1804 var unsafe
= v
.anchor_to
(expr
)
1805 var ntype
= self.n_type
1806 var mtype
= v
.resolve_mtype
(ntype
)
1807 if mtype
!= null and mtype
!= expr
then
1808 var umtype
= v
.anchor_to
(mtype
)
1809 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1811 self.is_typed
= true