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.
22 import modelize_property
26 redef class ToolContext
27 var typing_phase
: Phase = new TypingPhase(self, [flow_phase
, modelize_property_phase
, local_var_init_phase
])
30 private class TypingPhase
32 redef fun process_npropdef
(npropdef
) do npropdef
.do_typing
(toolcontext
.modelbuilder
)
35 private class TypeVisitor
36 var modelbuilder
: ModelBuilder
37 var nclassdef
: AClassdef
38 var mpropdef
: MPropDef
40 var selfvariable
: Variable = new Variable("self")
42 init(modelbuilder
: ModelBuilder, nclassdef
: AClassdef, mpropdef
: MPropDef)
44 self.modelbuilder
= modelbuilder
45 self.nclassdef
= nclassdef
46 self.mpropdef
= mpropdef
48 var mclass
= nclassdef
.mclassdef
.mclass
50 var selfvariable
= new Variable("self")
51 self.selfvariable
= selfvariable
52 selfvariable
.declared_type
= mclass
.mclass_type
55 fun mmodule
: MModule do return self.nclassdef
.mclassdef
.mmodule
57 fun anchor
: MClassType do return self.nclassdef
.mclassdef
.bound_mtype
59 fun anchor_to
(mtype
: MType): MType
61 var mmodule
= self.nclassdef
.mclassdef
.mmodule
62 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
63 return mtype
.anchor_to
(mmodule
, anchor
)
66 fun is_subtype
(sub
, sup
: MType): Bool
68 var mmodule
= self.nclassdef
.mclassdef
.mmodule
69 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
70 return sub
.is_subtype
(mmodule
, anchor
, sup
)
73 fun resolve_for
(mtype
, subtype
: MType, for_self
: Bool): MType
75 var mmodule
= self.nclassdef
.mclassdef
.mmodule
76 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
77 #print "resolve_for {mtype} sub={subtype} forself={for_self} mmodule={mmodule} anchor={anchor}"
78 var res
= mtype
.resolve_for
(subtype
, anchor
, mmodule
, not for_self
)
82 # Retrieve the signature of a `MMethodDef` resolved for a specific call.
83 # This method is an helper to symplify the query on the model.
85 # Note: `for_self` indicates if the reciever is self or not.
86 # If yes, virtual types are not resolved.
87 fun resolve_signature_for
(mmethoddef
: MMethodDef, recv
: MType, for_self
: Bool): MSignature
89 return self.resolve_for
(mmethoddef
.msignature
.as(not null), recv
, for_self
).as(MSignature)
92 # Check that `sub` is a subtype of `sup`.
93 # If `sub` is not a valud suptype, then display an error on `node` an return null.
94 # If `sub` is a safe subtype of `sup` then return `sub`.
95 # If `sub` is an insafe subtype (ie an imlicit cast is required), then return `sup`.
97 # The point of the return type is to determinate the usable type on an expression:
98 # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
99 # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
100 fun check_subtype
(node
: ANode, sub
, sup
: MType): nullable MType
102 if self.is_subtype
(sub
, sup
) then return sub
103 if self.is_subtype
(sub
, self.anchor_to
(sup
)) then
104 # FIXME workarround to the current unsafe typing policy. To remove once fixed virtual types exists.
105 #node.debug("Unsafe typing: expected {sup}, got {sub}")
108 self.modelbuilder
.error
(node
, "Type error: expected {sup}, got {sub}")
112 # Visit an expression and do not care about the return value
113 fun visit_stmt
(nexpr
: nullable AExpr)
115 if nexpr
== null then return
116 nexpr
.accept_typing
(self)
119 # Visit an expression and expects that it is not a statement
120 # Return the type of the expression
121 # Display an error and return null if:
122 # * the type cannot be determined or
123 # * `nexpr` is a statement
124 fun visit_expr
(nexpr
: AExpr): nullable MType
126 nexpr
.accept_typing
(self)
127 var mtype
= nexpr
.mtype
128 if mtype
!= null then return mtype
129 if not nexpr
.is_typed
then
130 if not self.modelbuilder
.toolcontext
.error_count
> 0 then # check that there is really an error
131 if self.modelbuilder
.toolcontext
.verbose_level
> 1 then
132 nexpr
.debug
("No return type but no error.")
135 return null # forward error
137 self.error
(nexpr
, "Type error: expected expression.")
141 # Visit an expression and expect its static type is a least a `sup`
142 # Return the type of the expression or null if
143 # * the type cannot be determined or
144 # * `nexpr` is a statement or
145 # * `nexpr` is not a `sup`
146 fun visit_expr_subtype
(nexpr
: AExpr, sup
: nullable MType): nullable MType
148 var sub
= visit_expr
(nexpr
)
149 if sub
== null then return null # Forward error
151 if sup
== null then return null # Forward error
153 var res
= check_subtype
(nexpr
, sub
, sup
)
155 nexpr
.implicit_cast_to
= res
160 # Visit an expression and expect its static type is a `Bool`
161 # Return the type of the expression or null if
162 # * the type cannot be determined or
163 # * `nexpr` is a statement or
164 # * `nexpr` is not a `Bool`
165 fun visit_expr_bool
(nexpr
: AExpr): nullable MType
167 return self.visit_expr_subtype
(nexpr
, self.type_bool
(nexpr
))
171 private fun visit_expr_cast
(node
: ANode, nexpr
: AExpr, ntype
: AType): nullable MType
173 var sub
= visit_expr
(nexpr
)
174 if sub
== null then return null # Forward error
176 var sup
= self.resolve_mtype
(ntype
)
177 if sup
== null then return null # Forward error
179 var mmodule
= self.nclassdef
.mclassdef
.mmodule
180 var anchor
= self.nclassdef
.mclassdef
.bound_mtype
182 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup}.")
183 else if self.is_subtype
(sub
, sup
) and not sup
.need_anchor
then
184 self.modelbuilder
.warning
(node
, "Warning: Expression is already a {sup} since it is a {sub}.")
189 fun try_get_mproperty_by_name2
(anode
: ANode, mtype
: MType, name
: String): nullable MProperty
191 return self.modelbuilder
.try_get_mproperty_by_name2
(anode
, self.nclassdef
.mclassdef
.mmodule
, mtype
, name
)
194 fun resolve_mtype
(node
: AType): nullable MType
196 return self.modelbuilder
.resolve_mtype
(self.nclassdef
, node
)
199 fun try_get_mclass
(node
: ANode, name
: String): nullable MClass
201 var mmodule
= self.nclassdef
.mclassdef
.mmodule
202 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
206 fun get_mclass
(node
: ANode, name
: String): nullable MClass
208 var mmodule
= self.nclassdef
.mclassdef
.mmodule
209 var mclass
= modelbuilder
.try_get_mclass_by_name
(node
, mmodule
, name
)
210 if mclass
== null then
211 self.modelbuilder
.error
(node
, "Type Error: missing primitive class `{name}'.")
216 fun type_bool
(node
: ANode): nullable MType
218 var mclass
= self.get_mclass
(node
, "Bool")
219 if mclass
== null then return null
220 return mclass
.mclass_type
223 fun get_method
(node
: ANode, recvtype
: MType, name
: String, recv_is_self
: Bool): nullable CallSite
225 var unsafe_type
= self.anchor_to
(recvtype
)
227 #debug("recv: {recvtype} (aka {unsafe_type})")
228 if recvtype
isa MNullType then
229 self.error
(node
, "Error: Method '{name}' call on 'null'.")
233 var mproperty
= self.try_get_mproperty_by_name2
(node
, unsafe_type
, name
)
234 if mproperty
== null then
235 #self.modelbuilder.error(node, "Type error: property {name} not found in {unsafe_type} (ie {recvtype})")
237 self.modelbuilder
.error
(node
, "Error: Method or variable '{name}' unknown in {recvtype}.")
239 self.modelbuilder
.error
(node
, "Error: Method '{name}' doesn't exists in {recvtype}.")
244 assert mproperty
isa MMethod
245 if mproperty
.visibility
== protected_visibility
and not recv_is_self
and self.mmodule
.visibility_for
(mproperty
.intro_mclassdef
.mmodule
) < intrude_visibility
then
246 self.modelbuilder
.error
(node
, "Error: Method '{name}' is protected and can only acceded by self. {mproperty.intro_mclassdef.mmodule.visibility_for(self.mmodule)}")
250 var propdefs
= mproperty
.lookup_definitions
(self.mmodule
, unsafe_type
)
252 if propdefs
.length
== 0 then
253 self.modelbuilder
.error
(node
, "Type error: no definition found for property {name} in {unsafe_type}")
255 else if propdefs
.length
== 1 then
256 mpropdef
= propdefs
.first
258 self.modelbuilder
.warning
(node
, "Warning: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
259 mpropdef
= mproperty
.intro
263 var msignature
= self.resolve_signature_for
(mpropdef
, recvtype
, recv_is_self
)
265 var erasure_cast
= false
266 var rettype
= mpropdef
.msignature
.return_mtype
267 if not recv_is_self
and rettype
!= null then
268 if rettype
isa MNullableType then rettype
= rettype
.mtype
269 if rettype
isa MParameterType then
270 var erased_rettype
= msignature
.return_mtype
271 assert erased_rettype
!= null
272 #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
277 var callsite
= new CallSite(node
, recvtype
, recv_is_self
, mproperty
, mpropdef
, msignature
, erasure_cast
)
281 # Visit the expressions of args and cheik their conformity with the corresponding typi in signature
282 # The point of this method is to handle varargs correctly
283 # Note: The signature must be correctly adapted
284 fun check_signature
(node
: ANode, args
: Array[AExpr], name
: String, msignature
: MSignature): Bool
286 var vararg_rank
= msignature
.vararg_rank
287 if vararg_rank
>= 0 then
288 if args
.length
< msignature
.arity
then
289 #self.modelbuilder.error(node, "Error: Incorrect number of parameters. Got {args.length}, expected at least {msignature.arity}. Signature is {msignature}")
290 self.modelbuilder
.error
(node
, "Error: arity mismatch; prototype is '{name}{msignature}'")
293 else if args
.length
!= msignature
.arity
then
294 self.modelbuilder
.error
(node
, "Error: Incorrect number of parameters. Got {args.length}, expected {msignature.arity}. Signature is {msignature}")
298 #debug("CALL {unsafe_type}.{msignature}")
300 var vararg_decl
= args
.length
- msignature
.arity
301 for i
in [0..msignature
.arity
[ do
303 if i
== vararg_rank
then continue # skip the vararg
304 if i
> vararg_rank
then
307 var paramtype
= msignature
.mparameters
[i
].mtype
308 self.visit_expr_subtype
(args
[j
], paramtype
)
310 if vararg_rank
>= 0 then
311 var varargs
= new Array[AExpr]
312 var paramtype
= msignature
.mparameters
[vararg_rank
].mtype
313 for j
in [vararg_rank
..vararg_rank
+vararg_decl
] do
315 self.visit_expr_subtype
(args
[j
], paramtype
)
321 fun error
(node
: ANode, message
: String)
323 self.modelbuilder
.toolcontext
.error
(node
.hot_location
, message
)
326 fun get_variable
(node
: AExpr, variable
: Variable): nullable MType
328 var flow
= node
.after_flow_context
330 self.error
(node
, "No context!")
334 if flow
.vars
.has_key
(variable
) then
335 return flow
.vars
[variable
]
337 #node.debug("*** START Collected for {variable}")
338 var mtypes
= flow
.collect_types
(variable
)
339 #node.debug("**** END Collected for {variable}")
340 if mtypes
== null or mtypes
.length
== 0 then
341 return variable
.declared_type
342 else if mtypes
.length
== 1 then
345 var res
= merge_types
(node
,mtypes
)
346 if res
== null then res
= variable
.declared_type
352 fun set_variable
(node
: AExpr, variable
: Variable, mtype
: nullable MType)
354 var flow
= node
.after_flow_context
357 flow
.set_var
(variable
, mtype
)
360 fun merge_types
(node
: ANode, col
: Array[nullable MType]): nullable MType
362 if col
.length
== 1 then return col
.first
363 var res
= new Array[nullable MType]
365 if t1
== null then continue # return null
368 if t2
== null then continue # return null
369 if t2
isa MNullableType or t2
isa MNullType then
372 if not is_subtype
(t2
, t1
) then found
= false
375 #print "merge {col.join(" ")} -> {t1}"
379 #self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
384 # A specific method call site with its associated informations.
386 # The assiciated node for location
389 # The statis type of the receiver
392 # Is the receiver self?
393 # If "for_self", virtual types of the signature are keeped
394 # If "not_for_self", virtual type are erased
395 var recv_is_self
: Bool
397 # The designated method
398 var mproperty
: MMethod
400 # The statically designated method definition
401 # The most specif one, it is.
402 var mpropdef
: MMethodDef
404 # The resolved signature for the receiver
405 var msignature
: MSignature
407 # Is a implicit cast required on erasure typing policy?
408 var erasure_cast
: Bool
410 private fun check_signature
(v
: TypeVisitor, args
: Array[AExpr]): Bool
412 return v
.check_signature
(self.node
, args
, self.mproperty
.name
, self.msignature
)
417 # The declared type of the variable
418 var declared_type
: nullable MType
421 redef class FlowContext
422 # Store changes of types because of type evolution
423 private var vars
: HashMap[Variable, nullable MType] = new HashMap[Variable, nullable MType]
424 private var cache
: HashMap[Variable, nullable Array[nullable MType]] = new HashMap[Variable, nullable Array[nullable MType]]
426 # Adapt the variable to a static type
427 # Warning1: do not modify vars directly.
428 # Warning2: sub-flow may have cached a unadapted variabial
429 private fun set_var
(variable
: Variable, mtype
: nullable MType)
431 self.vars
[variable
] = mtype
432 self.cache
.keys
.remove
(variable
)
435 private fun collect_types
(variable
: Variable): nullable Array[nullable MType]
437 if cache
.has_key
(variable
) then
438 return cache
[variable
]
440 var res
: nullable Array[nullable MType] = null
441 if vars
.has_key
(variable
) then
442 var mtype
= vars
[variable
]
444 else if self.previous
.is_empty
then
446 res
= [variable
.declared_type
]
448 for flow
in self.previous
do
449 if flow
.is_unreachable
then continue
450 var r2
= flow
.collect_types
(variable
)
451 if r2
== null then continue
456 if not res
.has
(t
) then res
.add
(t
)
461 cache
[variable
] = res
467 # The entry point of the whole typing analysis
468 fun do_typing
(modelbuilder
: ModelBuilder)
472 # The variable associated to the reciever (if any)
473 var selfvariable
: nullable Variable
476 redef class AConcreteMethPropdef
477 redef fun do_typing
(modelbuilder
: ModelBuilder)
479 var nclassdef
= self.parent
.as(AClassdef)
480 var mpropdef
= self.mpropdef
.as(not null)
481 var v
= new TypeVisitor(modelbuilder
, nclassdef
, mpropdef
)
482 self.selfvariable
= v
.selfvariable
484 var nblock
= self.n_block
485 if nblock
== null then return
487 var mmethoddef
= self.mpropdef
.as(not null)
488 for i
in [0..mmethoddef
.msignature
.arity
[ do
489 var mtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
490 if mmethoddef
.msignature
.vararg_rank
== i
then
491 var arrayclass
= v
.get_mclass
(self.n_signature
.n_params
[i
], "Array")
492 if arrayclass
== null then return # Skip error
493 mtype
= arrayclass
.get_mtype
([mtype
])
495 var variable
= self.n_signature
.n_params
[i
].variable
496 assert variable
!= null
497 variable
.declared_type
= mtype
501 if not nblock
.after_flow_context
.is_unreachable
and mmethoddef
.msignature
.return_mtype
!= null then
502 # We reach the end of the function without having a return, it is bad
503 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
508 redef class AAttrPropdef
509 redef fun do_typing
(modelbuilder
: ModelBuilder)
511 var nclassdef
= self.parent
.as(AClassdef)
512 var v
= new TypeVisitor(modelbuilder
, nclassdef
, self.mpropdef
.as(not null))
513 self.selfvariable
= v
.selfvariable
515 var nexpr
= self.n_expr
516 if nexpr
!= null then
517 var mtype
= self.mpropdef
.static_mtype
518 v
.visit_expr_subtype
(nexpr
, mtype
)
526 # The static type of the expression.
527 # null if self is a statement or in case of error
528 var mtype
: nullable MType = null
530 # Is the statement correctly typed?
531 # Used to distinguish errors and statements when `mtype == null`
532 var is_typed
: Bool = false
534 # If required, the following implicit cast `.as(XXX)`
535 # Such a cast may by required after evaluating the expression when
536 # a unsafe operation is detected (silently accepted by the Nit language).
537 # The attribute is computed by `check_subtype`
538 var implicit_cast_to
: nullable MType = null
540 # Return the variable read (if any)
541 # Used to perform adaptive typing
542 fun its_variable
: nullable Variable do return null
544 private fun accept_typing
(v
: TypeVisitor)
546 v
.error
(self, "no implemented accept_typing for {self.class_name}")
550 redef class ABlockExpr
551 redef fun accept_typing
(v
)
553 for e
in self.n_expr
do v
.visit_stmt
(e
)
557 # The type of a blockexpr is the one of the last expression (or null if empty)
560 if self.n_expr
.is_empty
then return null
561 return self.n_expr
.last
.mtype
565 redef class AVardeclExpr
566 redef fun accept_typing
(v
)
568 var variable
= self.variable
569 if variable
== null then return # Skip error
571 var ntype
= self.n_type
572 var mtype
: nullable MType
573 if ntype
== null then
576 mtype
= v
.resolve_mtype
(ntype
)
577 if mtype
== null then return # Skip error
580 var nexpr
= self.n_expr
581 if nexpr
!= null then
582 if mtype
!= null then
583 v
.visit_expr_subtype
(nexpr
, mtype
)
585 mtype
= v
.visit_expr
(nexpr
)
586 if mtype
== null then return # Skip error
591 if mtype
== null or mtype
isa MNullType then
592 decltype
= v
.get_mclass
(self, "Object").mclass_type
.as_nullable
593 if mtype
== null then mtype
= decltype
596 variable
.declared_type
= decltype
597 v
.set_variable
(self, variable
, mtype
)
599 #debug("var {variable}: {mtype}")
606 redef fun its_variable
do return self.variable
607 redef fun accept_typing
(v
)
609 var variable
= self.variable
610 if variable
== null then return # Skip error
612 var mtype
= v
.get_variable
(self, variable
)
613 if mtype
!= null then
614 #debug("{variable} is {mtype}")
616 #debug("{variable} is untyped")
623 redef class AVarAssignExpr
624 redef fun accept_typing
(v
)
626 var variable
= self.variable
627 assert variable
!= null
629 var mtype
= v
.visit_expr_subtype
(n_value
, variable
.declared_type
)
631 v
.set_variable
(self, variable
, mtype
)
637 redef class AReassignFormExpr
638 # The method designed by the reassign operator.
639 var reassign_callsite
: nullable CallSite
641 var read_type
: nullable MType = null
643 # Determine the `reassign_property`
644 # `readtype` is the type of the reading of the left value.
645 # `writetype` is the type of the writing of the left value.
646 # (Because of `ACallReassignExpr`, both can be different.
647 # Return the static type of the value to store.
648 private fun resolve_reassignment
(v
: TypeVisitor, readtype
, writetype
: MType): nullable MType
650 var reassign_name
: String
651 if self.n_assign_op
isa APlusAssignOp then
653 else if self.n_assign_op
isa AMinusAssignOp then
659 self.read_type
= readtype
661 if readtype
isa MNullType then
662 v
.error
(self, "Error: Method '{reassign_name}' call on 'null'.")
666 var callsite
= v
.get_method
(self, readtype
, reassign_name
, false)
667 if callsite
== null then return null # Skip error
668 self.reassign_callsite
= callsite
670 var msignature
= callsite
.msignature
671 var rettype
= msignature
.return_mtype
672 assert msignature
.arity
== 1 and rettype
!= null
674 var value_type
= v
.visit_expr_subtype
(self.n_value
, msignature
.mparameters
.first
.mtype
)
675 if value_type
== null then return null # Skip error
677 v
.check_subtype
(self, rettype
, writetype
)
682 redef class AVarReassignExpr
683 redef fun accept_typing
(v
)
685 var variable
= self.variable
686 assert variable
!= null
688 var readtype
= v
.get_variable
(self, variable
)
689 if readtype
== null then return
693 var writetype
= variable
.declared_type
694 if writetype
== null then return
696 var rettype
= self.resolve_reassignment
(v
, readtype
, writetype
)
698 v
.set_variable
(self, variable
, rettype
)
705 redef class AContinueExpr
706 redef fun accept_typing
(v
)
708 var nexpr
= self.n_expr
709 if nexpr
!= null then
710 var mtype
= v
.visit_expr
(nexpr
)
716 redef class ABreakExpr
717 redef fun accept_typing
(v
)
719 var nexpr
= self.n_expr
720 if nexpr
!= null then
721 var mtype
= v
.visit_expr
(nexpr
)
727 redef class AReturnExpr
728 redef fun accept_typing
(v
)
730 var nexpr
= self.n_expr
731 var ret_type
= v
.mpropdef
.as(MMethodDef).msignature
.return_mtype
732 if nexpr
!= null then
733 if ret_type
!= null then
734 var mtype
= v
.visit_expr_subtype
(nexpr
, ret_type
)
736 var mtype
= v
.visit_expr
(nexpr
)
737 v
.error
(self, "Error: Return with value in a procedure.")
739 else if ret_type
!= null then
740 v
.error
(self, "Error: Return without value in a function.")
746 redef class AAbortExpr
747 redef fun accept_typing
(v
)
754 redef fun accept_typing
(v
)
756 v
.visit_expr_bool
(n_expr
)
764 redef class AIfexprExpr
765 redef fun accept_typing
(v
)
767 v
.visit_expr_bool
(n_expr
)
769 var t1
= v
.visit_expr
(n_then
)
770 var t2
= v
.visit_expr
(n_else
)
772 if t1
== null or t2
== null then
776 var t
= v
.merge_types
(self, [t1
, t2
])
778 v
.error
(self, "Type Error: ambiguous type {t1} vs {t2}")
785 redef fun accept_typing
(v
)
787 v
.visit_stmt
(n_block
)
792 redef class AWhileExpr
793 redef fun accept_typing
(v
)
795 v
.visit_expr_bool
(n_expr
)
797 v
.visit_stmt
(n_block
)
802 redef class ALoopExpr
803 redef fun accept_typing
(v
)
805 v
.visit_stmt
(n_block
)
811 var coltype
: nullable MClassType
813 var method_iterator
: nullable CallSite
814 var method_is_ok
: nullable CallSite
815 var method_item
: nullable CallSite
816 var method_next
: nullable CallSite
817 var method_key
: nullable CallSite
819 private fun do_type_iterator
(v
: TypeVisitor, mtype
: MType)
821 if mtype
isa MNullType then
822 v
.error
(self, "Type error: 'for' cannot iterate over 'null'")
827 var objcla
= v
.get_mclass
(self, "Object")
828 if objcla
== null then return
830 # check iterator method
831 var itdef
= v
.get_method
(self, mtype
, "iterator", true)
832 if itdef
== null then
833 v
.error
(self, "Type Error: 'for' expects a type providing 'iterator' method, got '{mtype}'.")
836 self.method_iterator
= itdef
838 # check that iterator return something
839 var ittype
= itdef
.msignature
.return_mtype
840 if ittype
== null then
841 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
846 var colit_cla
= v
.try_get_mclass
(self, "Iterator")
847 var mapit_cla
= v
.try_get_mclass
(self, "MapIterator")
851 if colit_cla
!= null and v
.is_subtype
(ittype
, colit_cla
.get_mtype
([objcla
.mclass_type
.as_nullable
])) then
853 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, colit_cla
)
854 var variables
= self.variables
855 if variables
.length
!= 1 then
856 v
.error
(self, "Type Error: 'for' expects only one variable when using 'Iterator'.")
858 variables
.first
.declared_type
= coltype
.arguments
.first
863 if mapit_cla
!= null and v
.is_subtype
(ittype
, mapit_cla
.get_mtype
([objcla
.mclass_type
, objcla
.mclass_type
.as_nullable
])) then
865 var coltype
= ittype
.supertype_to
(v
.mmodule
, v
.anchor
, mapit_cla
)
866 var variables
= self.variables
867 if variables
.length
!= 2 then
868 v
.error
(self, "Type Error: 'for' expects two variables when using 'MapIterator'.")
870 variables
[0].declared_type
= coltype
.arguments
[0]
871 variables
[1].declared_type
= coltype
.arguments
[1]
876 if not is_col
and not is_map
then
877 v
.error
(self, "Type Error: 'for' expects method 'iterator' to return an 'Iterator' or 'MapIterator' type'.")
881 # anchor formal and virtual types
882 if mtype
.need_anchor
then mtype
= v
.anchor_to
(mtype
)
884 if mtype
isa MNullableType then mtype
= mtype
.mtype
885 self.coltype
= mtype
.as(MClassType)
887 # get methods is_ok, next, item
888 var ikdef
= v
.get_method
(self, ittype
, "is_ok", false)
889 if ikdef
== null then
890 v
.error
(self, "Type Error: 'for' expects a method 'is_ok' in 'Iterator' type {ittype}.")
893 self.method_is_ok
= ikdef
895 var itemdef
= v
.get_method
(self, ittype
, "item", false)
896 if itemdef
== null then
897 v
.error
(self, "Type Error: 'for' expects a method 'item' in 'Iterator' type {ittype}.")
900 self.method_item
= itemdef
902 var nextdef
= v
.get_method
(self, ittype
, "next", false)
903 if nextdef
== null then
904 v
.error
(self, "Type Error: 'for' expects a method 'next' in 'Iterator' type {ittype}.")
907 self.method_next
= nextdef
910 var keydef
= v
.get_method
(self, ittype
, "key", false)
911 if keydef
== null then
912 v
.error
(self, "Type Error: 'for' expects a method 'key' in 'Iterator' type {ittype}.")
915 self.method_key
= keydef
919 redef fun accept_typing
(v
)
921 var mtype
= v
.visit_expr
(n_expr
)
922 if mtype
== null then return
924 self.do_type_iterator
(v
, mtype
)
926 v
.visit_stmt
(n_block
)
931 redef class AAssertExpr
932 redef fun accept_typing
(v
)
934 v
.visit_expr_bool
(n_expr
)
942 redef fun accept_typing
(v
)
944 v
.visit_expr_bool
(n_expr
)
945 v
.visit_expr_bool
(n_expr2
)
946 self.mtype
= v
.type_bool
(self)
950 redef class AImpliesExpr
951 redef fun accept_typing
(v
)
953 v
.visit_expr_bool
(n_expr
)
954 v
.visit_expr_bool
(n_expr2
)
955 self.mtype
= v
.type_bool
(self)
960 redef fun accept_typing
(v
)
962 v
.visit_expr_bool
(n_expr
)
963 v
.visit_expr_bool
(n_expr2
)
964 self.mtype
= v
.type_bool
(self)
970 redef fun accept_typing
(v
)
972 v
.visit_expr_bool
(n_expr
)
973 self.mtype
= v
.type_bool
(self)
977 redef class AOrElseExpr
978 redef fun accept_typing
(v
)
980 var t1
= v
.visit_expr
(n_expr
)
981 var t2
= v
.visit_expr
(n_expr2
)
983 if t1
== null or t2
== null then
987 if t1
isa MNullableType then
991 var t
= v
.merge_types
(self, [t1
, t2
])
993 t
= v
.mmodule
.object_type
994 if t2
isa MNullableType then
997 #v.error(self, "Type Error: ambiguous type {t1} vs {t2}")
1003 redef class ATrueExpr
1004 redef fun accept_typing
(v
)
1006 self.mtype
= v
.type_bool
(self)
1010 redef class AFalseExpr
1011 redef fun accept_typing
(v
)
1013 self.mtype
= v
.type_bool
(self)
1017 redef class AIntExpr
1018 redef fun accept_typing
(v
)
1020 var mclass
= v
.get_mclass
(self, "Int")
1021 if mclass
== null then return # Forward error
1022 self.mtype
= mclass
.mclass_type
1026 redef class AFloatExpr
1027 redef fun accept_typing
(v
)
1029 var mclass
= v
.get_mclass
(self, "Float")
1030 if mclass
== null then return # Forward error
1031 self.mtype
= mclass
.mclass_type
1035 redef class ACharExpr
1036 redef fun accept_typing
(v
)
1038 var mclass
= v
.get_mclass
(self, "Char")
1039 if mclass
== null then return # Forward error
1040 self.mtype
= mclass
.mclass_type
1044 redef class AStringFormExpr
1045 redef fun accept_typing
(v
)
1047 var mclass
= v
.get_mclass
(self, "String")
1048 if mclass
== null then return # Forward error
1049 self.mtype
= mclass
.mclass_type
1053 redef class ASuperstringExpr
1054 redef fun accept_typing
(v
)
1056 var mclass
= v
.get_mclass
(self, "String")
1057 if mclass
== null then return # Forward error
1058 self.mtype
= mclass
.mclass_type
1059 for nexpr
in self.n_exprs
do
1060 var t
= v
.visit_expr
(nexpr
)
1065 redef class AArrayExpr
1066 redef fun accept_typing
(v
)
1068 var mtypes
= new Array[nullable MType]
1069 for e
in self.n_exprs
.n_exprs
do
1070 var t
= v
.visit_expr
(e
)
1076 var mtype
= v
.merge_types
(self, mtypes
)
1077 if mtype
== null then
1078 v
.error
(self, "Type Error: ambiguous array type {mtypes.join(" ")}")
1081 var mclass
= v
.get_mclass
(self, "Array")
1082 if mclass
== null then return # Forward error
1083 self.mtype
= mclass
.get_mtype
([mtype
])
1087 redef class ARangeExpr
1088 redef fun accept_typing
(v
)
1090 var discrete_class
= v
.get_mclass
(self, "Discrete")
1091 if discrete_class
== null then return # Forward error
1092 var discrete_type
= discrete_class
.intro
.bound_mtype
1093 var t1
= v
.visit_expr_subtype
(self.n_expr
, discrete_type
)
1094 var t2
= v
.visit_expr_subtype
(self.n_expr2
, discrete_type
)
1095 if t1
== null or t2
== null then return
1096 var mclass
= v
.get_mclass
(self, "Range")
1097 if mclass
== null then return # Forward error
1098 if v
.is_subtype
(t1
, t2
) then
1099 self.mtype
= mclass
.get_mtype
([t2
])
1100 else if v
.is_subtype
(t2
, t1
) then
1101 self.mtype
= mclass
.get_mtype
([t1
])
1103 v
.error
(self, "Type Error: Cannot create range: {t1} vs {t2}")
1108 redef class ANullExpr
1109 redef fun accept_typing
(v
)
1111 self.mtype
= v
.mmodule
.model
.null_type
1115 redef class AIsaExpr
1116 # The static type to cast to.
1117 # (different from the static type of the expression that is `Bool`).
1118 var cast_type
: nullable MType
1119 redef fun accept_typing
(v
)
1121 var mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1122 self.cast_type
= mtype
1124 var variable
= self.n_expr
.its_variable
1125 if variable
!= null then
1126 var orig
= self.n_expr
.mtype
1127 var from
= if orig
!= null then orig
.to_s
else "invalid"
1128 var to
= if mtype
!= null then mtype
.to_s
else "invalid"
1129 #debug("adapt {variable}: {from} -> {to}")
1130 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1133 self.mtype
= v
.type_bool
(self)
1137 redef class AAsCastExpr
1138 redef fun accept_typing
(v
)
1140 self.mtype
= v
.visit_expr_cast
(self, self.n_expr
, self.n_type
)
1144 redef class AAsNotnullExpr
1145 redef fun accept_typing
(v
)
1147 var mtype
= v
.visit_expr
(self.n_expr
)
1148 if mtype
isa MNullType then
1149 v
.error
(self, "Type error: as(not null) on null")
1152 if mtype
isa MNullableType then
1153 self.mtype
= mtype
.mtype
1156 # TODO: warn on useless as not null
1161 redef class AProxyExpr
1162 redef fun accept_typing
(v
)
1164 self.mtype
= v
.visit_expr
(self.n_expr
)
1168 redef class ASelfExpr
1169 redef var its_variable
: nullable Variable
1170 redef fun accept_typing
(v
)
1172 var variable
= v
.selfvariable
1173 self.its_variable
= variable
1174 self.mtype
= v
.get_variable
(self, variable
)
1178 ## MESSAGE SENDING AND PROPERTY
1180 redef class ASendExpr
1181 # The property invoked by the send.
1182 var callsite
: nullable CallSite
1184 redef fun accept_typing
(v
)
1186 var recvtype
= v
.visit_expr
(self.n_expr
)
1187 var name
= self.property_name
1189 if recvtype
== null then return # Forward error
1190 if recvtype
isa MNullType then
1191 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1195 var callsite
= v
.get_method
(self, recvtype
, name
, self.n_expr
isa ASelfExpr)
1196 if callsite
== null then return
1197 self.callsite
= callsite
1198 var msignature
= callsite
.msignature
1200 var args
= compute_raw_arguments
1201 self.raw_arguments
= args
1203 callsite
.check_signature
(v
, args
)
1205 if callsite
.mproperty
.is_init
then
1206 var vmpropdef
= v
.mpropdef
1207 if not (vmpropdef
isa MMethodDef and vmpropdef
.mproperty
.is_init
) then
1208 v
.error
(self, "Can call a init only in another init")
1212 var ret
= msignature
.return_mtype
1216 self.is_typed
= true
1220 # The name of the property
1221 # Each subclass simply provide the correct name.
1222 private fun property_name
: String is abstract
1224 # An array of all arguments (excluding self)
1225 var raw_arguments
: nullable Array[AExpr]
1227 private fun compute_raw_arguments
: Array[AExpr] is abstract
1230 redef class ABinopExpr
1231 redef fun compute_raw_arguments
do return [n_expr2
]
1234 redef fun property_name
do return "=="
1235 redef fun accept_typing
(v
)
1239 var variable
= self.n_expr
.its_variable
1240 if variable
== null then return
1241 var mtype
= self.n_expr2
.mtype
1242 if not mtype
isa MNullType then return
1243 var vartype
= v
.get_variable
(self, variable
)
1244 if not vartype
isa MNullableType then return
1245 self.after_flow_context
.when_true
.set_var
(variable
, mtype
)
1246 self.after_flow_context
.when_false
.set_var
(variable
, vartype
.mtype
)
1247 #debug("adapt {variable}:{vartype} ; true->{mtype} false->{vartype.mtype}")
1251 redef fun property_name
do return "!="
1252 redef fun accept_typing
(v
)
1256 var variable
= self.n_expr
.its_variable
1257 if variable
== null then return
1258 var mtype
= self.n_expr2
.mtype
1259 if not mtype
isa MNullType then return
1260 var vartype
= v
.get_variable
(self, variable
)
1261 if not vartype
isa MNullableType then return
1262 self.after_flow_context
.when_false
.set_var
(variable
, mtype
)
1263 self.after_flow_context
.when_true
.set_var
(variable
, vartype
.mtype
)
1264 #debug("adapt {variable}:{vartype} ; true->{vartype.mtype} false->{mtype}")
1268 redef fun property_name
do return "<"
1271 redef fun property_name
do return "<="
1274 redef fun property_name
do return "<<"
1277 redef fun property_name
do return ">"
1280 redef fun property_name
do return ">="
1283 redef fun property_name
do return ">>"
1285 redef class APlusExpr
1286 redef fun property_name
do return "+"
1288 redef class AMinusExpr
1289 redef fun property_name
do return "-"
1291 redef class AStarshipExpr
1292 redef fun property_name
do return "<=>"
1294 redef class AStarExpr
1295 redef fun property_name
do return "*"
1297 redef class ASlashExpr
1298 redef fun property_name
do return "/"
1300 redef class APercentExpr
1301 redef fun property_name
do return "%"
1304 redef class AUminusExpr
1305 redef fun property_name
do return "unary -"
1306 redef fun compute_raw_arguments
do return new Array[AExpr]
1310 redef class ACallExpr
1311 redef fun property_name
do return n_id
.text
1312 redef fun compute_raw_arguments
do return n_args
.to_a
1315 redef class ACallAssignExpr
1316 redef fun property_name
do return n_id
.text
+ "="
1317 redef fun compute_raw_arguments
1319 var res
= n_args
.to_a
1325 redef class ABraExpr
1326 redef fun property_name
do return "[]"
1327 redef fun compute_raw_arguments
do return n_args
.to_a
1330 redef class ABraAssignExpr
1331 redef fun property_name
do return "[]="
1332 redef fun compute_raw_arguments
1334 var res
= n_args
.to_a
1340 redef class ASendReassignFormExpr
1341 # The property invoked for the writing
1342 var write_callsite
: nullable CallSite
1344 redef fun accept_typing
(v
)
1346 var recvtype
= v
.visit_expr
(self.n_expr
)
1347 var name
= self.property_name
1349 if recvtype
== null then return # Forward error
1350 if recvtype
isa MNullType then
1351 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1355 var for_self
= self.n_expr
isa ASelfExpr
1356 var callsite
= v
.get_method
(self, recvtype
, name
, for_self
)
1358 if callsite
== null then return
1359 self.callsite
= callsite
1361 var args
= compute_raw_arguments
1362 self.raw_arguments
= args
1364 callsite
.check_signature
(v
, args
)
1366 var readtype
= callsite
.msignature
.return_mtype
1367 if readtype
== null then
1368 v
.error
(self, "Error: {name} is not a function")
1372 var wcallsite
= v
.get_method
(self, recvtype
, name
+ "=", self.n_expr
isa ASelfExpr)
1373 if wcallsite
== null then return
1374 self.write_callsite
= wcallsite
1376 var wtype
= self.resolve_reassignment
(v
, readtype
, wcallsite
.msignature
.mparameters
.last
.mtype
)
1377 if wtype
== null then return
1379 args
= args
.to_a
# duplicate so raw_arguments keeps only the getter args
1380 args
.add
(self.n_value
)
1381 wcallsite
.check_signature
(v
, args
)
1383 self.is_typed
= true
1387 redef class ACallReassignExpr
1388 redef fun property_name
do return n_id
.text
1389 redef fun compute_raw_arguments
do return n_args
.to_a
1392 redef class ABraReassignExpr
1393 redef fun property_name
do return "[]"
1394 redef fun compute_raw_arguments
do return n_args
.to_a
1397 redef class AInitExpr
1398 redef fun property_name
do return "init"
1399 redef fun compute_raw_arguments
do return n_args
.to_a
1403 fun to_a
: Array[AExpr] do return self.n_exprs
.to_a
1408 redef class ASuperExpr
1409 # The method to call if the super is in fact a 'super init call'
1410 # Note: if the super is a normal call-next-method, then this attribute is null
1411 var callsite
: nullable CallSite
1413 # The method to call is the super is a standard `call-next-method` super-call
1414 # Note: if the super is a special super-init-call, then this attribute is null
1415 var mpropdef
: nullable MMethodDef
1417 redef fun accept_typing
(v
)
1419 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1420 var mproperty
= v
.mpropdef
.mproperty
1421 if not mproperty
isa MMethod then
1422 v
.error
(self, "Error: super only usable in a method")
1425 var superprops
= mproperty
.lookup_super_definitions
(v
.mmodule
, recvtype
)
1426 if superprops
.length
== 0 then
1427 if mproperty
.is_init
and v
.mpropdef
.is_intro
then
1428 process_superinit
(v
)
1431 v
.error
(self, "Error: No super method to call for {mproperty}.")
1434 # FIXME: covariance of return type in linear extension?
1435 var superprop
= superprops
.first
1437 var msignature
= v
.resolve_signature_for
(superprop
, recvtype
, true)
1438 var args
= self.n_args
.to_a
1439 if args
.length
> 0 then
1440 v
.check_signature
(self, args
, mproperty
.name
, msignature
)
1442 self.mtype
= msignature
.return_mtype
1443 self.is_typed
= true
1444 v
.mpropdef
.has_supercall
= true
1445 mpropdef
= v
.mpropdef
.as(MMethodDef)
1448 private fun process_superinit
(v
: TypeVisitor)
1450 var recvtype
= v
.nclassdef
.mclassdef
.bound_mtype
1451 var mpropdef
= v
.mpropdef
1452 assert mpropdef
isa MMethodDef
1453 var mproperty
= mpropdef
.mproperty
1454 var superprop
: nullable MMethodDef = null
1455 for msupertype
in v
.nclassdef
.mclassdef
.supertypes
do
1456 msupertype
= msupertype
.anchor_to
(v
.mmodule
, recvtype
)
1457 var errcount
= v
.modelbuilder
.toolcontext
.error_count
1458 var candidate
= v
.try_get_mproperty_by_name2
(self, msupertype
, mproperty
.name
).as(nullable MMethod)
1459 if candidate
== null then
1460 if v
.modelbuilder
.toolcontext
.error_count
> errcount
then return # Forard error
1461 continue # Try next super-class
1463 if superprop
!= null and superprop
.mproperty
!= candidate
then
1464 v
.error
(self, "Error: conflicting super constructor to call for {mproperty}: {candidate.full_name}, {superprop.mproperty.full_name}")
1467 var candidatedefs
= candidate
.lookup_definitions
(v
.mmodule
, recvtype
)
1468 if superprop
!= null then
1469 if superprop
== candidatedefs
.first
then continue
1470 candidatedefs
.add
(superprop
)
1472 if candidatedefs
.length
> 1 then
1473 v
.error
(self, "Error: confliting property definitions for property {mproperty} in {recvtype}: {candidatedefs.join(", ")}")
1476 superprop
= candidatedefs
.first
1478 if superprop
== null then
1479 v
.error
(self, "Error: No super method to call for {mproperty}.")
1483 var msignature
= v
.resolve_signature_for
(superprop
, recvtype
, true)
1484 var callsite
= new CallSite(self, recvtype
, true, superprop
.mproperty
, superprop
, msignature
, false)
1485 self.callsite
= callsite
1487 var args
= self.n_args
.to_a
1488 if args
.length
> 0 then
1489 callsite
.check_signature
(v
, args
)
1491 # Check there is at least enough parameters
1492 if mpropdef
.msignature
.arity
< msignature
.arity
then
1493 v
.error
(self, "Error: Not enough implicit arguments to pass. Got {mpropdef.msignature.arity}, expected at least {msignature.arity}. Signature is {msignature}")
1496 # Check that each needed parameter is conform
1498 for sp
in msignature
.mparameters
do
1499 var p
= mpropdef
.msignature
.mparameters
[i
]
1500 if not v
.is_subtype
(p
.mtype
, sp
.mtype
) then
1501 v
.error
(self, "Type error: expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}. Signature is {msignature}")
1508 self.is_typed
= true
1514 redef class ANewExpr
1515 # The constructor invoked by the new.
1516 var callsite
: nullable CallSite
1518 redef fun accept_typing
(v
)
1520 var recvtype
= v
.resolve_mtype
(self.n_type
)
1521 if recvtype
== null then return
1522 self.mtype
= recvtype
1524 if not recvtype
isa MClassType then
1525 if recvtype
isa MNullableType then
1526 v
.error
(self, "Type error: cannot instantiate the nullable type {recvtype}.")
1529 v
.error
(self, "Type error: cannot instantiate the formal type {recvtype}.")
1533 if recvtype
.mclass
.kind
== abstract_kind
then
1534 v
.error
(self, "Cannot instantiate abstract class {recvtype}.")
1536 else if recvtype
.mclass
.kind
== interface_kind
then
1537 v
.error
(self, "Cannot instantiate interface {recvtype}.")
1549 var callsite
= v
.get_method
(self, recvtype
, name
, false)
1550 if callsite
== null then return
1552 self.callsite
= callsite
1554 if not callsite
.mproperty
.is_init_for
(recvtype
.mclass
) then
1555 v
.error
(self, "Error: {name} is not a constructor.")
1559 var args
= n_args
.to_a
1560 callsite
.check_signature
(v
, args
)
1566 redef class AAttrFormExpr
1567 # The attribute acceded.
1568 var mproperty
: nullable MAttribute
1570 # The static type of the attribute.
1571 var attr_type
: nullable MType
1573 # Resolve the attribute acceded.
1574 private fun resolve_property
(v
: TypeVisitor)
1576 var recvtype
= v
.visit_expr
(self.n_expr
)
1577 if recvtype
== null then return # Skip error
1578 var name
= self.n_id
.text
1579 if recvtype
isa MNullType then
1580 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1584 var unsafe_type
= v
.anchor_to
(recvtype
)
1585 var mproperty
= v
.try_get_mproperty_by_name2
(self, unsafe_type
, name
)
1586 if mproperty
== null then
1587 v
.modelbuilder
.error
(self, "Error: Attribute {name} doesn't exists in {recvtype}.")
1590 assert mproperty
isa MAttribute
1591 self.mproperty
= mproperty
1593 var mpropdefs
= mproperty
.lookup_definitions
(v
.mmodule
, unsafe_type
)
1594 assert mpropdefs
.length
== 1
1595 var mpropdef
= mpropdefs
.first
1596 var attr_type
= mpropdef
.static_mtype
.as(not null)
1597 attr_type
= v
.resolve_for
(attr_type
, recvtype
, self.n_expr
isa ASelfExpr)
1598 self.attr_type
= attr_type
1602 redef class AAttrExpr
1603 redef fun accept_typing
(v
)
1605 self.resolve_property
(v
)
1606 self.mtype
= self.attr_type
1611 redef class AAttrAssignExpr
1612 redef fun accept_typing
(v
)
1614 self.resolve_property
(v
)
1615 var mtype
= self.attr_type
1617 v
.visit_expr_subtype
(self.n_value
, mtype
)
1618 self.is_typed
= true
1622 redef class AAttrReassignExpr
1623 redef fun accept_typing
(v
)
1625 self.resolve_property
(v
)
1626 var mtype
= self.attr_type
1627 if mtype
== null then return # Skip error
1629 self.resolve_reassignment
(v
, mtype
, mtype
)
1631 self.is_typed
= true
1635 redef class AIssetAttrExpr
1636 redef fun accept_typing
(v
)
1638 self.resolve_property
(v
)
1639 var mtype
= self.attr_type
1640 if mtype
== null then return # Skip error
1642 var recvtype
= self.n_expr
.mtype
.as(not null)
1643 var bound
= v
.resolve_for
(mtype
, recvtype
, false)
1644 if bound
isa MNullableType then
1645 v
.error
(self, "Error: isset on a nullable attribute.")
1647 self.mtype
= v
.type_bool
(self)
1653 redef class ADebugTypeExpr
1654 redef fun accept_typing
(v
)
1656 var expr
= v
.visit_expr
(self.n_expr
)
1657 if expr
== null then return
1658 var unsafe
= v
.anchor_to
(expr
)
1659 var ntype
= self.n_type
1660 var mtype
= v
.resolve_mtype
(ntype
)
1661 if mtype
!= null and mtype
!= expr
then
1662 var umtype
= v
.anchor_to
(mtype
)
1663 v
.modelbuilder
.warning
(self, "Found type {expr} (-> {unsafe}), expected {mtype} (-> {umtype})")
1665 self.is_typed
= true