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 paramtype
= msignature
.mparameters
[vararg_rank
].mtype
381 var first
= args
[vararg_rank
]
382 if vararg_decl
== 0 and first
isa AVarargExpr then
383 var mclass
= get_mclass
(node
, "Array")
384 if mclass
== null then return false # Forward error
385 var array_mtype
= mclass
.get_mtype
([paramtype
])
386 self.visit_expr_subtype
(first
.n_expr
, array_mtype
)
387 first
.mtype
= first
.n_expr
.mtype
389 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
390 self.visit_expr_subtype
(args
[j
], paramtype
)
397 fun error
(node
: ANode, message
: String)
399 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
402 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
404 var flow
= node
.after_flow_context
406 self.error
(node
, "No context!")
410 if flow
.vars
.has_key
(variable
) then
411 return flow
.vars
[variable
]
413 #node.debug("*** START Collected for {variable}")
414 var mtypes
= flow
.collect_types
(variable
)
415 #node.debug("**** END Collected for {variable}")
416 if mtypes
== null or mtypes
.length
== 0 then
417 return variable
.declared_type
418 else if mtypes
.length
== 1 then
421 var res
= merge_types
(node
,mtypes
)
422 if res
== null then res
= variable
.declared_type
428 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
430 var flow
= node
.after_flow_context
433 flow
.set_var
(variable
, mtype
)
436 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
438 if col
.length
== 1 then return col
.first
440 if t1
== null then continue # return null
443 if t2
== null then continue # return null
444 if t2
isa MNullableType or t2
isa MNullType then
447 if not is_subtype
(t2
, t1
) then found
= false
450 #print "merge {col.join(" ")} -> {t1}"
454 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
459 # A specific method call site with its associated informations.
461 # The associated node for location
464 # The static type of the receiver (possibly unresolved)
467 # The module where the callsite is present
470 # The anchor to use with `recv` or `msignature`
471 var anchor
: nullable MClassType
473 # Is the receiver self?
474 # If "for_self", virtual types of the signature are kept
475 # If "not_for_self", virtual type are erased
476 var recv_is_self
: Bool
478 # The designated method
479 var mproperty
: MMethod
481 # The statically designated method definition
482 # The most specif one, it is.
483 var mpropdef
: MMethodDef
485 # The resolved signature for the receiver
486 var msignature
: MSignature
488 # Is a implicit cast required on erasure typing policy?
489 var erasure_cast
: Bool
491 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
493 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
498 # The declared type of the variable
499 var declared_type
: nullable MType
502 redef class FlowContext
503 # Store changes of types because of type evolution
504 private var vars
= new HashMap[Variable, nullable MType]
505 private var cache
= new HashMap[Variable, nullable Array[nullable MType]]
507 # Adapt the variable to a static type
508 # Warning1: do not modify vars directly.
509 # Warning2: sub-flow may have cached a unadapted variable
510 private fun set_var
(variable
: Variable, mtype
: nullable MType)
512 self.vars
[variable
] = mtype
513 self.cache
.keys
.remove
(variable
)
516 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
518 if cache
.has_key
(variable
) then
519 return cache
[variable
]
521 var res
: nullable Array[nullable MType] = null
522 if vars
.has_key
(variable
) then
523 var mtype
= vars
[variable
]
525 else if self.previous
.is_empty
then
527 res
= [variable
.declared_type
]
529 for flow
in self.previous
do
530 if flow
.is_unreachable
then continue
531 var r2
= flow
.collect_types
(variable
)
532 if r2
== null then continue
537 if not res
.has
(t
) then res
.add
(t
)
542 cache
[variable
] = res
548 # The entry point of the whole typing analysis
549 fun do_typing
(modelbuilder
: ModelBuilder)
553 # The variable associated to the receiver (if any)
554 var selfvariable
: nullable Variable
557 redef class AMethPropdef
558 redef fun do_typing
(modelbuilder
: ModelBuilder)
560 var nblock
= self.n_block
561 if nblock
== null then return
563 var mpropdef
= self.mpropdef
.as(not null)
564 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
565 self.selfvariable
= v
.selfvariable
567 var mmethoddef
= self.mpropdef
.as(not null)
568 for i
in [0..mmethoddef
.msignature
.arity
[ do
569 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
570 if mmethoddef
.msignature
.vararg_rank
== i
then
571 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
572 if arrayclass
== null then return # Skip error
573 mtype
= arrayclass
.get_mtype
([mtype
])
575 var variable
= self.n_signature
.n_params
[i
].variable
576 assert variable
!= null
577 variable
.declared_type
= mtype
581 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
582 # We reach the end of the function without having a return, it is bad
583 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
588 redef class AAttrPropdef
589 redef fun do_typing
(modelbuilder
: ModelBuilder)
591 var mpropdef
= self.mpropdef
.as(not null)
592 var v
= new TypeVisitor(modelbuilder
, mpropdef
.mclassdef
.mmodule
, mpropdef
)
593 self.selfvariable
= v
.selfvariable
595 var nexpr
= self.n_expr
596 if nexpr
!= null then
597 var mtype
= self.mpropdef
.static_mtype
598 v
.visit_expr_subtype
(nexpr
, mtype
)
606 # The static type of the expression.
607 # null if self is a statement or in case of error
608 var mtype
: nullable MType = null
610 # Is the statement correctly typed?
611 # Used to distinguish errors and statements when `mtype == null`
612 var is_typed
: Bool = false
614 # If required, the following implicit cast `.as(XXX)`
615 # Such a cast may by required after evaluating the expression when
616 # a unsafe operation is detected (silently accepted by the Nit language).
617 # The attribute is computed by `check_subtype`
618 var implicit_cast_to
: nullable MType = null
620 # Return the variable read (if any)
621 # Used to perform adaptive typing
622 fun its_variable
: nullable Variable do return null
624 private fun accept_typing
(v
: TypeVisitor)
626 v
.error
(self, "no implemented accept_typing for {self.class_name}")
630 redef class ABlockExpr
631 redef fun accept_typing
(v
)
633 for e
in self.n_expr
do v
.visit_stmt
(e
)
637 # The type of a blockexpr is the one of the last expression (or null if empty)
640 if self.n_expr
.is_empty
then return null
641 return self.n_expr
.last
.mtype
645 redef class AVardeclExpr
646 redef fun accept_typing
(v
)
648 var variable
= self.variable
649 if variable
== null then return # Skip error
651 var ntype
= self.n_type
652 var mtype
: nullable MType
653 if ntype
== null then
656 mtype
= v
.resolve_mtype
(ntype
)
657 if mtype
== null then return # Skip error
660 var nexpr
= self.n_expr
661 if nexpr
!= null then
662 if mtype
!= null then
663 v
.visit_expr_subtype
(nexpr
, mtype
)
665 mtype
= v
.visit_expr
(nexpr
)
666 if mtype
== null then return # Skip error
671 if mtype
== null or mtype
isa MNullType then
672 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
673 if mtype
== null then mtype
= decltype
676 variable
.declared_type
= decltype
677 v
.set_variable
(self, variable
, mtype
)
679 #debug("var {variable}: {mtype}")
686 redef fun its_variable
do return self.variable
687 redef fun accept_typing
(v
)
689 var variable
= self.variable
690 if variable
== null then return # Skip error
692 var mtype
= v
.get_variable
(self, variable
)
693 if mtype
!= null then
694 #debug("{variable} is {mtype}")
696 #debug("{variable} is untyped")
703 redef class AVarAssignExpr
704 redef fun accept_typing
(v
)
706 var variable
= self.variable
707 assert variable
!= null
709 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
711 v
.set_variable
(self, variable
, mtype
)
717 redef class AReassignFormExpr
718 # The method designed by the reassign operator.
719 var reassign_callsite
: nullable CallSite
721 var read_type
: nullable MType = null
723 # Determine the `reassign_property`
724 # `readtype` is the type of the reading of the left value.
725 # `writetype` is the type of the writing of the left value.
726 # (Because of `ACallReassignExpr`, both can be different.
727 # Return the static type of the value to store.
728 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
730 var reassign_name
: String
731 if self.n_assign_op
isa APlusAssignOp then
733 else if self.n_assign_op
isa AMinusAssignOp then
739 self.read_type
= readtype
741 if readtype
isa MNullType then
742 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
746 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
747 if callsite
== null then return null # Skip error
748 self.reassign_callsite
= callsite
750 var msignature
= callsite
.msignature
751 var rettype
= msignature
.return_mtype
752 assert msignature
.arity
== 1 and rettype
!= null
754 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
755 if value_type
== null then return null # Skip error
757 v
.check_subtype
(self, rettype
, writetype
)
762 redef class AVarReassignExpr
763 redef fun accept_typing
(v
)
765 var variable
= self.variable
766 assert variable
!= null
768 var readtype
= v
.get_variable
(self, variable
)
769 if readtype
== null then return
773 var writetype
= variable
.declared_type
774 if writetype
== null then return
776 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
778 v
.set_variable
(self, variable
, rettype
)
785 redef class AContinueExpr
786 redef fun accept_typing
(v
)
788 var nexpr
= self.n_expr
789 if nexpr
!= null then
796 redef class ABreakExpr
797 redef fun accept_typing
(v
)
799 var nexpr
= self.n_expr
800 if nexpr
!= null then
807 redef class AReturnExpr
808 redef fun accept_typing
(v
)
810 var nexpr
= self.n_expr
811 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
812 if nexpr
!= null then
813 if ret_type
!= null then
814 v
.visit_expr_subtype
(nexpr
, ret_type
)
817 v
.error
(self, "Error: Return with value in a procedure.")
819 else if ret_type
!= null then
820 v
.error
(self, "Error: Return without value in a function.")
826 redef class AAbortExpr
827 redef fun accept_typing
(v
)
834 redef fun accept_typing
(v
)
836 v
.visit_expr_bool
(n_expr
)
844 redef class AIfexprExpr
845 redef fun accept_typing
(v
)
847 v
.visit_expr_bool
(n_expr
)
849 var t1
= v
.visit_expr
(n_then
)
850 var t2
= v
.visit_expr
(n_else
)
852 if t1
== null or t2
== null then
856 var t
= v
.merge_types
(self, [t1
, t2
])
858 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
865 redef fun accept_typing
(v
)
867 v
.visit_stmt
(n_block
)
872 redef class AWhileExpr
873 redef fun accept_typing
(v
)
875 v
.visit_expr_bool
(n_expr
)
877 v
.visit_stmt
(n_block
)
882 redef class ALoopExpr
883 redef fun accept_typing
(v
)
885 v
.visit_stmt
(n_block
)
891 var coltype
: nullable MClassType
893 var method_iterator
: nullable CallSite
894 var method_is_ok
: nullable CallSite
895 var method_item
: nullable CallSite
896 var method_next
: nullable CallSite
897 var method_key
: nullable CallSite
898 var method_finish
: nullable CallSite
900 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
902 if mtype
isa MNullType then
903 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
908 var objcla
= v
.get_mclass
(self, "Object")
909 if objcla
== null then return
911 # check iterator method
912 var itdef
= v
.get_method
(self, mtype
, "iterator", n_expr
isa ASelfExpr)
913 if itdef
== null then
914 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
917 self.method_iterator
= itdef
919 # check that iterator return something
920 var ittype
= itdef
.msignature
.return_mtype
921 if ittype
== null then
922 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
927 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
928 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
932 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
934 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
935 var variables
= self.variables
936 if variables
.length
!= 1 then
937 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
939 variables
.first
.declared_type
= coltype
.arguments
.first
944 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
946 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
947 var variables
= self.variables
948 if variables
.length
!= 2 then
949 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
951 variables
[0].declared_type
= coltype
.arguments
[0]
952 variables
[1].declared_type
= coltype
.arguments
[1]
957 if not is_col
and not is_map
then
958 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
962 # anchor formal and virtual types
963 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
965 mtype
= mtype
.as_notnullable
966 self.coltype
= mtype
.as(MClassType)
968 # get methods is_ok, next, item
969 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
970 if ikdef
== null then
971 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
974 self.method_is_ok
= ikdef
976 var itemdef
= v
.get_method
(self, ittype
, "item", false)
977 if itemdef
== null then
978 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
981 self.method_item
= itemdef
983 var nextdef
= v
.get_method
(self, ittype
, "next", false)
984 if nextdef
== null then
985 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
988 self.method_next
= nextdef
990 self.method_finish
= v
.try_get_method
(self, ittype
, "finish", false)
993 var keydef
= v
.get_method
(self, ittype
, "key", false)
994 if keydef
== null then
995 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
998 self.method_key
= keydef
1002 redef fun accept_typing
(v
)
1004 var mtype
= v
.visit_expr
(n_expr
)
1005 if mtype
== null then return
1007 self.do_type_iterator
(v
, mtype
)
1009 v
.visit_stmt
(n_block
)
1010 self.is_typed
= true
1014 redef class AAssertExpr
1015 redef fun accept_typing
(v
)
1017 v
.visit_expr_bool
(n_expr
)
1019 v
.visit_stmt
(n_else
)
1020 self.is_typed
= true
1025 redef fun accept_typing
(v
)
1027 v
.visit_expr_bool
(n_expr
)
1028 v
.visit_expr_bool
(n_expr2
)
1029 self.mtype
= v
.type_bool
(self)
1033 redef class AImpliesExpr
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 AAndExpr
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)
1052 redef class ANotExpr
1053 redef fun accept_typing
(v
)
1055 v
.visit_expr_bool
(n_expr
)
1056 self.mtype
= v
.type_bool
(self)
1060 redef class AOrElseExpr
1061 redef fun accept_typing
(v
)
1063 var t1
= v
.visit_expr
(n_expr
)
1064 var t2
= v
.visit_expr
(n_expr2
)
1066 if t1
== null or t2
== null then
1070 t1
= t1
.as_notnullable
1072 var t
= v
.merge_types
(self, [t1
, t2
])
1074 t
= v
.mmodule
.object_type
1075 if t2
isa MNullableType then
1078 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1084 redef class ATrueExpr
1085 redef fun accept_typing
(v
)
1087 self.mtype
= v
.type_bool
(self)
1091 redef class AFalseExpr
1092 redef fun accept_typing
(v
)
1094 self.mtype
= v
.type_bool
(self)
1098 redef class AIntExpr
1099 redef fun accept_typing
(v
)
1101 var mclass
= v
.get_mclass
(self, "Int")
1102 if mclass
== null then return # Forward error
1103 self.mtype
= mclass
.mclass_type
1107 redef class AFloatExpr
1108 redef fun accept_typing
(v
)
1110 var mclass
= v
.get_mclass
(self, "Float")
1111 if mclass
== null then return # Forward error
1112 self.mtype
= mclass
.mclass_type
1116 redef class ACharExpr
1117 redef fun accept_typing
(v
)
1119 var mclass
= v
.get_mclass
(self, "Char")
1120 if mclass
== null then return # Forward error
1121 self.mtype
= mclass
.mclass_type
1125 redef class AStringFormExpr
1126 redef fun accept_typing
(v
)
1128 var mclass
= v
.get_mclass
(self, "String")
1129 if mclass
== null then return # Forward error
1130 self.mtype
= mclass
.mclass_type
1134 redef class ASuperstringExpr
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
1140 for nexpr
in self.n_exprs
do
1141 v
.visit_expr_subtype
(nexpr
, v
.mmodule
.object_type
)
1146 redef class AArrayExpr
1147 var with_capacity_callsite
: nullable CallSite
1148 var push_callsite
: nullable CallSite
1150 redef fun accept_typing
(v
)
1152 var mtype
: nullable MType = null
1153 var ntype
= self.n_type
1154 if ntype
!= null then
1155 mtype
= v
.resolve_mtype
(ntype
)
1156 if mtype
== null then return # Skip error
1158 var mtypes
= new Array[nullable MType]
1160 for e
in self.n_exprs
.n_exprs
do
1161 var t
= v
.visit_expr
(e
)
1165 if mtype
!= null then
1166 if v
.check_subtype
(e
, t
, mtype
) == null then return # Skip error
1167 if t
== mtype
then useless
= true
1172 if mtype
== null then
1173 mtype
= v
.merge_types
(self, mtypes
)
1175 if mtype
== null then
1176 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1180 assert ntype
!= null
1181 v
.modelbuilder
.warning
(ntype
, "useless-type", "Warning: useless type declaration `{mtype}` in literal Array since it can be inferred from the elements type.")
1183 var mclass
= v
.get_mclass
(self, "Array")
1184 if mclass
== null then return # Forward error
1185 var array_mtype
= mclass
.get_mtype
([mtype
])
1187 with_capacity_callsite
= v
.get_method
(self, array_mtype
, "with_capacity", false)
1188 push_callsite
= v
.get_method
(self, array_mtype
, "push", false)
1190 self.mtype
= array_mtype
1194 redef class ARangeExpr
1195 var init_callsite
: nullable CallSite
1197 redef fun accept_typing
(v
)
1199 var discrete_class
= v
.get_mclass
(self, "Discrete")
1200 if discrete_class
== null then return # Forward error
1201 var discrete_type
= discrete_class
.intro
.bound_mtype
1202 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1203 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1204 if t1
== null or t2
== null then return
1205 var mclass
= v
.get_mclass
(self, "Range")
1206 if mclass
== null then return # Forward error
1208 if v
.is_subtype
(t1
, t2
) then
1209 mtype
= mclass
.get_mtype
([t2
])
1210 else if v
.is_subtype
(t2
, t1
) then
1211 mtype
= mclass
.get_mtype
([t1
])
1213 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1219 # get the constructor
1221 if self isa ACrangeExpr then
1222 callsite
= v
.get_method
(self, mtype
, "init", false)
1223 else if self isa AOrangeExpr then
1224 callsite
= v
.get_method
(self, mtype
, "without_last", false)
1228 init_callsite
= callsite
1232 redef class ANullExpr
1233 redef fun accept_typing
(v
)
1235 self.mtype
= v
.mmodule
.model
.null_type
1239 redef class AIsaExpr
1240 # The static type to cast to.
1241 # (different from the static type of the expression that is `Bool`).
1242 var cast_type
: nullable MType
1243 redef fun accept_typing
(v
)
1245 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1246 self.cast_type
= mtype
1248 var variable
= self.n_expr
.its_variable
1249 if variable
!= null then
1250 #var orig = self.n_expr.mtype
1251 #var from = if orig != null then orig.to_s else "invalid"
1252 #var to = if mtype != null then mtype.to_s else "invalid"
1253 #debug("adapt {variable}: {from} -> {to}")
1254 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1257 self.mtype
= v
.type_bool
(self)
1261 redef class AAsCastExpr
1262 redef fun accept_typing
(v
)
1264 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1268 redef class AAsNotnullExpr
1269 redef fun accept_typing
(v
)
1271 var mtype
= v
.visit_expr
(self.n_expr
)
1272 if mtype
== null then return # Forward error
1274 if mtype
isa MNullType then
1275 v
.error
(self, "Type error: as(not null) on null")
1278 if mtype
isa MNullableType then
1279 self.mtype
= mtype
.mtype
1284 if mtype
isa MClassType then
1285 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}`.")
1288 assert mtype
.need_anchor
1289 var u
= v
.anchor_to
(mtype
)
1290 if not u
isa MNullableType then
1291 v
.modelbuilder
.warning
(self, "useless-type-test", "Warning: expression is already not null, since it is a `{mtype}: {u}`.")
1297 redef class AProxyExpr
1298 redef fun accept_typing
(v
)
1300 self.mtype
= v
.visit_expr
(self.n_expr
)
1304 redef class ASelfExpr
1305 redef var its_variable
: nullable Variable
1306 redef fun accept_typing
(v
)
1308 if v
.is_toplevel_context
and not self isa AImplicitSelfExpr then
1309 v
.error
(self, "Error: self cannot be used in top-level method.")
1311 var variable
= v
.selfvariable
1312 self.its_variable
= variable
1313 self.mtype
= v
.get_variable
(self, variable
)
1317 ## MESSAGE SENDING AND PROPERTY
1319 redef class ASendExpr
1320 # The property invoked by the send.
1321 var callsite
: nullable CallSite
1323 redef fun accept_typing
(v
)
1325 var recvtype
= v
.visit_expr
(self.n_expr
)
1326 var name
= self.property_name
1328 if recvtype
== null then return # Forward error
1329 if recvtype
isa MNullType then
1330 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1334 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1335 if callsite
== null then return
1336 self.callsite
= callsite
1337 var msignature
= callsite
.msignature
1339 var args
= compute_raw_arguments
1341 callsite
.check_signature
(v
, args
)
1343 if callsite
.mproperty
.is_init
then
1344 var vmpropdef
= v
.mpropdef
1345 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1346 v
.error
(self, "Can call a init only in another init")
1348 if vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_root_init
and not callsite
.mproperty
.is_root_init
then
1349 v
.error
(self, "Error: {vmpropdef} cannot call a factory {callsite.mproperty}")
1353 var ret
= msignature
.return_mtype
1357 self.is_typed
= true
1361 # The name of the property
1362 # Each subclass simply provide the correct name.
1363 private fun property_name
: String is abstract
1365 # An array of all arguments (excluding self)
1366 fun raw_arguments
: Array[AExpr] do return compute_raw_arguments
1368 private fun compute_raw_arguments
: Array[AExpr] is abstract
1371 redef class ABinopExpr
1372 redef fun compute_raw_arguments
do return [n_expr2
]
1375 redef fun property_name
do return "=="
1376 redef fun accept_typing
(v
)
1383 redef fun property_name
do return "!="
1384 redef fun accept_typing
(v
)
1391 redef fun property_name
do return "<"
1394 redef fun property_name
do return "<="
1397 redef fun property_name
do return "<<"
1400 redef fun property_name
do return ">"
1403 redef fun property_name
do return ">="
1406 redef fun property_name
do return ">>"
1408 redef class APlusExpr
1409 redef fun property_name
do return "+"
1411 redef class AMinusExpr
1412 redef fun property_name
do return "-"
1414 redef class AStarshipExpr
1415 redef fun property_name
do return "<=>"
1417 redef class AStarExpr
1418 redef fun property_name
do return "*"
1420 redef class AStarstarExpr
1421 redef fun property_name
do return "**"
1423 redef class ASlashExpr
1424 redef fun property_name
do return "/"
1426 redef class APercentExpr
1427 redef fun property_name
do return "%"
1430 redef class AUminusExpr
1431 redef fun property_name
do return "unary -"
1432 redef fun compute_raw_arguments
do return new Array[AExpr]
1436 redef class ACallExpr
1437 redef fun property_name
do return n_id
.text
1438 redef fun compute_raw_arguments
do return n_args
.to_a
1441 redef class ACallAssignExpr
1442 redef fun property_name
do return n_id
.text
+ "="
1443 redef fun compute_raw_arguments
1445 var res
= n_args
.to_a
1451 redef class ABraExpr
1452 redef fun property_name
do return "[]"
1453 redef fun compute_raw_arguments
do return n_args
.to_a
1456 redef class ABraAssignExpr
1457 redef fun property_name
do return "[]="
1458 redef fun compute_raw_arguments
1460 var res
= n_args
.to_a
1466 redef class ASendReassignFormExpr
1467 # The property invoked for the writing
1468 var write_callsite
: nullable CallSite
1470 redef fun accept_typing
(v
)
1472 var recvtype
= v
.visit_expr
(self.n_expr
)
1473 var name
= self.property_name
1475 if recvtype
== null then return # Forward error
1476 if recvtype
isa MNullType then
1477 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1481 var for_self
= self.n_expr
isa ASelfExpr
1482 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1484 if callsite
== null then return
1485 self.callsite
= callsite
1487 var args
= compute_raw_arguments
1489 callsite
.check_signature
(v
, args
)
1491 var readtype
= callsite
.msignature
.return_mtype
1492 if readtype
== null then
1493 v
.error
(self, "Error: {name} is not a function")
1497 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1498 if wcallsite
== null then return
1499 self.write_callsite
= wcallsite
1501 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1502 if wtype
== null then return
1504 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1505 args
.add
(self.n_value
)
1506 wcallsite
.check_signature
(v
, args
)
1508 self.is_typed
= true
1512 redef class ACallReassignExpr
1513 redef fun property_name
do return n_id
.text
1514 redef fun compute_raw_arguments
do return n_args
.to_a
1517 redef class ABraReassignExpr
1518 redef fun property_name
do return "[]"
1519 redef fun compute_raw_arguments
do return n_args
.to_a
1522 redef class AInitExpr
1523 redef fun property_name
do return "init"
1524 redef fun compute_raw_arguments
do return n_args
.to_a
1528 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1533 redef class ASuperExpr
1534 # The method to call if the super is in fact a 'super init call'
1535 # Note: if the super is a normal call-next-method, then this attribute is null
1536 var callsite
: nullable CallSite
1538 # The method to call is the super is a standard `call-next-method` super-call
1539 # Note: if the super is a special super-init-call, then this attribute is null
1540 var mpropdef
: nullable MMethodDef
1542 redef fun accept_typing
(v
)
1544 var anchor
= v
.anchor
1545 assert anchor
!= null
1546 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1547 assert recvtype
!= null
1548 var mproperty
= v
.mpropdef
.mproperty
1549 if not mproperty
isa MMethod then
1550 v
.error
(self, "Error: super only usable in a method")
1553 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, anchor
)
1554 if superprops
.length
== 0 then
1555 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1556 process_superinit
(v
)
1559 v
.error
(self, "Error: No super method to call for {mproperty}.")
1562 # FIXME: covariance of return type in linear extension?
1563 var superprop
= superprops
.first
1565 var msignature
= superprop
.msignature
.as(not null)
1566 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1567 var args
= self.n_args
.to_a
1568 if args
.length
> 0 then
1569 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1571 self.mtype
= msignature
.return_mtype
1572 self.is_typed
= true
1573 v
.mpropdef
.has_supercall
= true
1574 mpropdef
= v
.mpropdef
.as(MMethodDef)
1577 private fun process_superinit
(v
: TypeVisitor)
1579 var anchor
= v
.anchor
1580 assert anchor
!= null
1581 var recvtype
= v
.get_variable
(self, v
.selfvariable
)
1582 assert recvtype
!= null
1583 var mpropdef
= v
.mpropdef
1584 assert mpropdef
isa MMethodDef
1585 var mproperty
= mpropdef
.mproperty
1586 var superprop
: nullable MMethodDef = null
1587 for msupertype
in mpropdef
.mclassdef
.supertypes
do
1588 msupertype
= msupertype
.anchor_to
(v
.mmodule
, anchor
)
1589 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1590 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1591 if candidate
== null then
1592 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forward error
1593 continue # Try next super-class
1595 if superprop
!= null and candidate
.is_root_init
then
1598 if superprop
!= null and superprop
.mproperty
!= candidate
and not superprop
.mproperty
.is_root_init
then
1599 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1602 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, anchor
)
1603 if superprop
!= null and superprop
.mproperty
== candidate
then
1604 if superprop
== candidatedefs
.first
then continue
1605 candidatedefs
.add
(superprop
)
1607 if candidatedefs
.length
> 1 then
1608 v
.error
(self, "Error: conflicting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1611 superprop
= candidatedefs
.first
1613 if superprop
== null then
1614 v
.error
(self, "Error: No super method to call for {mproperty}.")
1618 var msignature
= superprop
.new_msignature
or else superprop
.msignature
.as(not null)
1619 msignature
= v
.resolve_for
(msignature
, recvtype
, true).as(MSignature)
1621 var callsite
= new CallSite(self, recvtype
, v
.mmodule
, v
.anchor
, true, superprop
.mproperty
, superprop
, msignature
, false)
1622 self.callsite
= callsite
1624 var args
= self.n_args
.to_a
1625 if args
.length
> 0 then
1626 callsite
.check_signature
(v
, args
)
1628 # Check there is at least enough parameters
1629 if mpropdef
.msignature
.arity
< msignature
.arity
then
1630 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1633 # Check that each needed parameter is conform
1635 for sp
in msignature
.mparameters
do
1636 var p
= mpropdef
.msignature
.mparameters
[i
]
1637 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1638 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1645 self.is_typed
= true
1651 redef class ANewExpr
1652 # The constructor invoked by the new.
1653 var callsite
: nullable CallSite
1655 redef fun accept_typing
(v
)
1657 var recvtype
= v
.resolve_mtype
(self.n_type
)
1658 if recvtype
== null then return
1659 self.mtype
= recvtype
1661 if not recvtype
isa MClassType then
1662 if recvtype
isa MNullableType then
1663 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1666 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1670 if recvtype
.mclass
.kind
== abstract_kind
then
1671 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1673 else if recvtype
.mclass
.kind
== interface_kind
then
1674 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1686 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1687 if callsite
== null then return
1689 self.callsite
= callsite
1691 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1692 v
.error
(self, "Error: {name} is not a constructor.")
1696 var args
= n_args
.to_a
1697 callsite
.check_signature
(v
, args
)
1703 redef class AAttrFormExpr
1704 # The attribute acceded.
1705 var mproperty
: nullable MAttribute
1707 # The static type of the attribute.
1708 var attr_type
: nullable MType
1710 # Resolve the attribute acceded.
1711 private fun resolve_property
(v
: TypeVisitor)
1713 var recvtype
= v
.visit_expr
(self.n_expr
)
1714 if recvtype
== null then return # Skip error
1715 var name
= self.n_id
.text
1716 if recvtype
isa MNullType then
1717 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1721 var unsafe_type
= v
.anchor_to
(recvtype
)
1722 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1723 if mproperty
== null then
1724 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1727 assert mproperty
isa MAttribute
1728 self.mproperty
= mproperty
1730 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1731 assert mpropdefs
.length
== 1
1732 var mpropdef
= mpropdefs
.first
1733 var attr_type
= mpropdef
.static_mtype
.as(not null)
1734 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1735 self.attr_type
= attr_type
1739 redef class AAttrExpr
1740 redef fun accept_typing
(v
)
1742 self.resolve_property
(v
)
1743 self.mtype
= self.attr_type
1748 redef class AAttrAssignExpr
1749 redef fun accept_typing
(v
)
1751 self.resolve_property
(v
)
1752 var mtype
= self.attr_type
1754 v
.visit_expr_subtype
(self.n_value
, mtype
)
1755 self.is_typed
= true
1759 redef class AAttrReassignExpr
1760 redef fun accept_typing
(v
)
1762 self.resolve_property
(v
)
1763 var mtype
= self.attr_type
1764 if mtype
== null then return # Skip error
1766 self.resolve_reassignment
(v
, mtype
, mtype
)
1768 self.is_typed
= true
1772 redef class AIssetAttrExpr
1773 redef fun accept_typing
(v
)
1775 self.resolve_property
(v
)
1776 var mtype
= self.attr_type
1777 if mtype
== null then return # Skip error
1779 var recvtype
= self.n_expr
.mtype
.as(not null)
1780 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1781 if bound
isa MNullableType then
1782 v
.error
(self, "Error: isset on a nullable attribute.")
1784 self.mtype
= v
.type_bool
(self)
1788 redef class AVarargExpr
1789 redef fun accept_typing
(v
)
1791 # This kind of pseudo-expression can be only processed trough a signature
1792 # See `check_signature`
1793 # Other cases are a syntax error.
1794 v
.error
(self, "Syntax error: unexpected `...`")
1800 redef class ADebugTypeExpr
1801 redef fun accept_typing
(v
)
1803 var expr
= v
.visit_expr
(self.n_expr
)
1804 if expr
== null then return
1805 var unsafe
= v
.anchor_to
(expr
)
1806 var ntype
= self.n_type
1807 var mtype
= v
.resolve_mtype
(ntype
)
1808 if mtype
!= null and mtype
!= expr
then
1809 var umtype
= v
.anchor_to
(mtype
)
1810 v
.modelbuilder
.warning
(self, "debug", "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1812 self.is_typed
= true