1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2008 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 # Analysis property bodies, statements and expressions
24 redef class MMSrcModule
25 # Walk trough the module and type statments and expressions
26 # Require than supermodules are processed
27 fun do_typing
(tc
: ToolContext)
29 var tv
= new TypingVisitor(tc
, self)
35 # * Associate local variables to nodes
36 # * Distinguish method call and local variable access
37 # * Resolve call and attribute access
38 # * Check type conformance
39 private class TypingVisitor
40 special AbsSyntaxVisitor
43 if n
!= null then n
.accept_typing
(self)
46 # Current knowledge about variables names and types
47 fun variable_ctx
: VariableContext do return _variable_ctx
.as(not null)
48 writable var _variable_ctx
: nullable VariableContext
50 # Non-bypassable knowledge about variables names and types
51 fun base_variable_ctx
: VariableContext do return _base_variable_ctx
.as(not null)
52 writable var _base_variable_ctx
: nullable VariableContext
54 # Current knowledge about escapable blocks
55 readable writable var _escapable_ctx
: EscapableContext = new EscapableContext(self)
57 # The current reciever
58 fun self_var
: ParamVariable do return _self_var
.as(not null)
59 writable var _self_var
: nullable ParamVariable
61 # Block of the current method
62 readable writable var _top_block
: nullable PExpr
64 # List of explicit invocation of constructors of super-classes
65 readable writable var _explicit_super_init_calls
: nullable Array[MMMethod]
67 # Is a other constructor of the same class invoked
68 readable writable var _explicit_other_init_call
: Bool = false
70 # Make the if_true_variable_ctx of the expression effective
71 private fun use_if_true_variable_ctx
(e
: PExpr)
73 var ctx
= e
.if_true_variable_ctx
74 if ctx
!= null then variable_ctx
= ctx
77 # Make the if_false_variable_ctx of the expression effective
78 private fun use_if_false_variable_ctx
(e
: PExpr)
80 var ctx
= e
.if_false_variable_ctx
81 if ctx
!= null then variable_ctx
= ctx
84 # Number of nested once
85 readable writable var _once_count
: Int = 0
87 init(tc
, module) do super
89 private fun get_default_constructor_for
(n
: PNode, c
: MMLocalClass, prop
: MMSrcMethod): nullable MMMethod
92 #var prop = v.local_property
93 #assert prop isa MMMethod
94 var candidates
= new Array[MMMethod]
95 var false_candidates
= new Array[MMMethod]
96 var parity
= prop
.signature
.arity
97 for g
in c
.global_properties
do
98 if not g
.is_init_for
(c
) then continue
100 var gps
= gp
.signature_for
(c
.get_type
)
101 assert gp
isa MMSrcMethod
102 var garity
= gps
.arity
103 if gp
.name
== prop
.name
then
104 if garity
== 0 or (parity
== garity
and prop
.signature
< gps
) then
107 false_candidates
.add
(gp
)
109 else if garity
== 0 and gp
.name
== once
("init".to_symbol
) then
111 false_candidates
.add
(gp
)
113 false_candidates
.add
(gp
)
116 if candidates
.length
== 1 then
117 return candidates
.first
118 else if candidates
.length
> 0 then
119 var a
= new Array[String]
120 for p
in candidates
do
121 a
.add
("{p.full_name}{p.signature}")
123 v
.error
(n
, "Error: Conflicting default constructor to call for {c}: {a.join(", ")}.")
125 else if false_candidates
.length
> 0 then
126 var a
= new Array[String]
127 for p
in false_candidates
do
128 a
.add
("{p.full_name}{p.signature}")
130 v
.error
(n
, "Error: there is no available compatible constrctor in {c}. Discarded candidates are {a.join(", ")}.")
133 v
.error
(n
, "Error: there is no available compatible constrctor in {c}.")
140 ###############################################################################
143 private fun accept_typing
(v
: TypingVisitor)
145 accept_abs_syntax_visitor
(v
)
148 private fun after_typing
(v
: TypingVisitor) do end
151 redef class PClassdef
152 redef fun accept_typing
(v
)
154 v
.variable_ctx
= new RootVariableContext(v
, self)
155 v
.base_variable_ctx
= v
.variable_ctx
156 v
.self_var
= new ParamVariable("self".to_symbol
, self)
157 v
.self_var
.stype
= local_class
.get_type
162 redef class AAttrPropdef
163 redef fun accept_typing
(v
)
165 var old_var_ctx
= v
.variable_ctx
166 v
.variable_ctx
= old_var_ctx
.sub
(self)
168 if n_expr
!= null then
169 v
.check_conform_expr
(n_expr
.as(not null), prop
.signature
.return_type
.as(not null))
171 v
.variable_ctx
= old_var_ctx
175 redef class AMethPropdef
176 redef fun self_var
do return _self_var
.as(not null)
177 var _self_var
: nullable ParamVariable
178 redef fun accept_typing
(v
)
180 var old_var_ctx
= v
.variable_ctx
181 v
.variable_ctx
= old_var_ctx
.sub
(self)
182 _self_var
= v
.self_var
184 v
.variable_ctx
= old_var_ctx
188 redef class AConcreteMethPropdef
189 redef fun after_typing
(v
)
192 if v
.variable_ctx
.unreash
== false and method
.signature
.return_type
!= null then
193 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
198 redef class AConcreteInitPropdef
199 redef fun accept_typing
(v
)
201 v
.top_block
= n_block
202 v
.explicit_super_init_calls
= explicit_super_init_calls
203 v
.explicit_other_init_call
= false
205 if v
.explicit_other_init_call
or method
.global
.intro
!= method
then
209 var l
= explicit_super_init_calls
.length
210 var cur_m
: nullable MMMethod = null
211 var cur_c
: nullable MMLocalClass = null
213 cur_m
= explicit_super_init_calls
[i
]
214 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
217 while j
< v
.local_class
.cshe
.direct_greaters
.length
do
218 var c
= v
.local_class
.cshe
.direct_greaters
[j
]
219 if c
.global
.is_interface
or c
.global
.is_universal
or c
.global
.is_mixin
then
221 else if cur_c
!= null and (c
.cshe
<= cur_c
or cur_c
.global
.is_mixin
) then
222 if c
== cur_c
then j
+= 1
223 super_init_calls
.add
(cur_m
.as(not null))
226 cur_m
= explicit_super_init_calls
[i
]
227 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
233 var p
= v
.get_default_constructor_for
(self, c
, method
)
235 super_init_calls
.add
(p
)
245 redef fun after_typing
(v
)
247 v
.variable_ctx
.add
(variable
)
251 redef class AClosureDecl
252 # The corresponding escapable object
253 readable var _escapable
: nullable EscapableBlock
255 redef fun accept_typing
(v
)
257 # Register the closure for ClosureCallExpr
258 v
.variable_ctx
.add
(variable
)
260 var old_var_ctx
= v
.variable_ctx
261 var old_base_var_ctx
= v
.base_variable_ctx
262 v
.base_variable_ctx
= v
.variable_ctx
263 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
265 var escapable
= new EscapableClosure(self, variable
.closure
, null)
266 _escapable
= escapable
267 v
.escapable_ctx
.push
(escapable
)
271 if n_expr
!= null then
272 if v
.variable_ctx
.unreash
== false then
273 if variable
.closure
.signature
.return_type
!= null then
274 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
275 else if variable
.closure
.is_break
then
276 v
.error
(self, "Control error: Reached end of break block (an 'abort' was expected).")
281 old_var_ctx
.merge
(v
.variable_ctx
)
282 v
.variable_ctx
= old_var_ctx
283 v
.base_variable_ctx
= old_base_var_ctx
289 redef fun stype
: MMType do return _stype
.as(not null)
290 redef fun is_typed
: Bool do return _stype
!= null
291 var _stype
: nullable MMType
293 redef fun after_typing
(v
)
295 _stype
= get_stype
(v
)
300 redef readable var _is_typed
: Bool = false
301 redef fun is_statement
: Bool do return _stype
== null
305 print
"{locate}: not is_typed"
309 print
"{locate}: is_statement"
312 return _stype
.as(not null)
314 var _stype
: nullable MMType
316 # Is the expression the implicit receiver
317 fun is_implicit_self
: Bool do return false
319 # Is the expression the current receiver (implicit or explicit)
320 fun is_self
: Bool do return false
322 # The variable accessed is any
323 fun its_variable
: nullable Variable do return null
325 # The variable type information if current boolean expression is true
326 readable private var _if_true_variable_ctx
: nullable VariableContext
328 # The variable type information if current boolean expression is false
329 readable private var _if_false_variable_ctx
: nullable VariableContext
332 redef class AVardeclExpr
333 var _variable
: nullable VarVariable
334 redef fun variable
do return _variable
.as(not null)
336 redef fun after_typing
(v
)
338 var va
= new VarVariable(n_id
.to_symbol
, self)
340 v
.variable_ctx
.add
(va
)
341 if n_expr
!= null then v
.variable_ctx
.mark_is_set
(va
)
343 if n_type
!= null then
344 if not n_type
.is_typed
then return
345 va
.stype
= n_type
.stype
346 if n_expr
!= null then
347 v
.check_conform_expr
(n_expr
.as(not null), va
.stype
)
350 if not v
.check_expr
(n_expr
.as(not null)) then return
351 va
.stype
= n_expr
.stype
357 redef class ABlockExpr
358 redef fun accept_typing
(v
)
360 var old_var_ctx
= v
.variable_ctx
361 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
364 if v
.variable_ctx
.unreash
and not v
.variable_ctx
.already_unreash
then
365 v
.variable_ctx
.already_unreash
= true
366 v
.warning
(e
, "Warning: unreachable statement.")
371 old_var_ctx
.merge
(v
.variable_ctx
)
372 v
.variable_ctx
= old_var_ctx
377 redef class AReturnExpr
378 redef fun after_typing
(v
)
380 v
.variable_ctx
.unreash
= true
381 var t
= v
.local_property
.signature
.return_type
383 if e
== null and t
!= null then
384 v
.error
(self, "Error: Return without value in a function.")
385 else if e
!= null and t
== null then
386 v
.error
(self, "Error: Return with value in a procedure.")
387 else if e
!= null and t
!= null then
388 v
.check_conform_expr
(e
, t
)
394 redef class AContinueExpr
395 redef fun after_typing
(v
)
397 v
.variable_ctx
.unreash
= true
398 var esc
= compute_escapable_block
(v
.escapable_ctx
)
399 if esc
== null then return
401 if esc
.is_break_block
then
402 v
.error
(self, "Error: 'continue' forbiden in break blocks.")
406 var t
= esc
.continue_stype
407 if n_expr
== null and t
!= null then
408 v
.error
(self, "Error: continue with a value required in this block.")
409 else if n_expr
!= null and t
== null then
410 v
.error
(self, "Error: continue without value required in this block.")
411 else if n_expr
!= null and t
!= null then
412 v
.check_conform_expr
(n_expr
.as(not null), t
)
418 redef class ABreakExpr
419 redef fun after_typing
(v
)
421 v
.variable_ctx
.unreash
= true
422 var esc
= compute_escapable_block
(v
.escapable_ctx
)
423 if esc
== null then return
425 var bl
= esc
.break_list
426 if n_expr
== null and bl
!= null then
427 v
.error
(self, "Error: break with a value required in this block.")
428 else if n_expr
!= null and bl
== null then
429 v
.error
(self, "Error: break without value required in this block.")
430 else if n_expr
!= null and bl
!= null then
431 # Typing check can only be done later
432 bl
.add
(n_expr
.as(not null))
438 redef class AAbortExpr
439 redef fun after_typing
(v
)
441 v
.variable_ctx
.unreash
= true
446 redef fun accept_typing
(v
)
448 var old_var_ctx
= v
.variable_ctx
449 v
.enter_visit
(n_expr
)
450 v
.check_conform_expr
(n_expr
, v
.type_bool
)
452 # Prepare 'then' context
453 v
.use_if_true_variable_ctx
(n_expr
)
456 if n_then
!= null then
457 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
.as(not null))
458 v
.enter_visit
(n_then
)
461 # Remember what appened in the 'then'
462 var then_var_ctx
= v
.variable_ctx
464 # Prepare 'else' context
465 v
.variable_ctx
= old_var_ctx
466 v
.use_if_false_variable_ctx
(n_expr
)
469 if n_else
!= null then
470 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
.as(not null))
471 v
.enter_visit
(n_else
)
474 # Merge 'then' and 'else' contexts
475 old_var_ctx
.merge2
(then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
476 v
.variable_ctx
= old_var_ctx
481 redef class AWhileExpr
482 # The corresponding escapable block
483 readable var _escapable
: nullable EscapableBlock
485 redef fun accept_typing
(v
)
487 var escapable
= new EscapableBlock(self)
488 _escapable
= escapable
489 v
.escapable_ctx
.push
(escapable
)
490 var old_var_ctx
= v
.variable_ctx
491 var old_base_var_ctx
= v
.base_variable_ctx
492 v
.base_variable_ctx
= v
.variable_ctx
493 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
496 v
.enter_visit
(n_expr
)
497 v
.check_conform_expr
(n_expr
, v
.type_bool
)
499 # Prepare inside context (assert cond)
500 v
.use_if_true_variable_ctx
(n_expr
)
503 if n_block
!= null then
504 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
505 v
.enter_visit
(n_block
)
508 v
.variable_ctx
= old_var_ctx
509 v
.base_variable_ctx
= old_base_var_ctx
516 var _variable
: nullable AutoVariable
517 redef fun variable
do return _variable
.as(not null)
519 # The corresponding escapable block
520 readable var _escapable
: nullable EscapableBlock
522 var _meth_iterator
: nullable MMMethod
523 redef fun meth_iterator
: MMMethod do return _meth_iterator
.as(not null)
524 var _meth_is_ok
: nullable MMMethod
525 redef fun meth_is_ok
: MMMethod do return _meth_is_ok
.as(not null)
526 var _meth_item
: nullable MMMethod
527 redef fun meth_item
: MMMethod do return _meth_item
.as(not null)
528 var _meth_next
: nullable MMMethod
529 redef fun meth_next
: MMMethod do return _meth_next
.as(not null)
530 redef fun accept_typing
(v
)
532 var escapable
= new EscapableBlock(self)
533 _escapable
= escapable
534 v
.escapable_ctx
.push
(escapable
)
536 var old_var_ctx
= v
.variable_ctx
537 var old_base_var_ctx
= v
.base_variable_ctx
538 v
.base_variable_ctx
= v
.variable_ctx
539 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
540 var va
= new AutoVariable(n_id
.to_symbol
, self)
542 v
.variable_ctx
.add
(va
)
544 v
.enter_visit
(n_expr
)
546 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then return
547 var expr_type
= n_expr
.stype
549 _meth_iterator
= expr_type
.local_class
.select_method
(once
("iterator".to_symbol
))
550 if _meth_iterator
== null then
551 v
.error
(self, "Error: Collection MUST have an iterate method")
554 var iter_type
= _meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
555 _meth_is_ok
= iter_type
.local_class
.select_method
(once
("is_ok".to_symbol
))
556 if _meth_is_ok
== null then
557 v
.error
(self, "Error: {iter_type} MUST have an is_ok method")
560 _meth_item
= iter_type
.local_class
.select_method
(once
("item".to_symbol
))
561 if _meth_item
== null then
562 v
.error
(self, "Error: {iter_type} MUST have an item method")
565 _meth_next
= iter_type
.local_class
.select_method
(once
("next".to_symbol
))
566 if _meth_next
== null then
567 v
.error
(self, "Error: {iter_type} MUST have a next method")
570 var t
= _meth_item
.signature_for
(iter_type
).return_type
571 if not n_expr
.is_self
then t
= t
.not_for_self
574 if n_block
!= null then v
.enter_visit
(n_block
)
577 v
.variable_ctx
= old_var_ctx
578 v
.base_variable_ctx
= old_base_var_ctx
584 redef class AAssertExpr
585 redef fun after_typing
(v
)
587 v
.check_conform_expr
(n_expr
, v
.type_bool
)
588 v
.use_if_true_variable_ctx
(n_expr
)
593 redef class AVarFormExpr
594 var _variable
: nullable Variable
595 redef fun variable
do return _variable
.as(not null)
599 redef fun its_variable
do return variable
601 redef fun after_typing
(v
)
603 v
.variable_ctx
.check_is_set
(self, variable
)
604 _stype
= v
.variable_ctx
.stype
(variable
)
605 _is_typed
= _stype
!= null
609 redef class AVarAssignExpr
610 redef fun after_typing
(v
)
612 v
.variable_ctx
.mark_is_set
(variable
)
613 var t
= v
.variable_ctx
.stype
(variable
)
615 # Check the base type
616 var btype
= v
.base_variable_ctx
.stype
(variable
)
617 if not v
.check_conform_expr
(n_value
, btype
) then return
620 v
.variable_ctx
.stype
(variable
) = n_value
.stype
626 redef class AReassignFormExpr
627 # Compute and check method used through the reassigment operator
628 # On success return the static type of the result of the reassigment operator
629 # Else display an error and return null
630 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
632 if type_lvalue
== null then
635 var name
= n_assign_op
.method_name
636 var lc
= type_lvalue
.local_class
637 if not lc
.has_global_property_by_name
(name
) then
638 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
641 var prop
= lc
.select_method
(name
)
642 prop
.global
.check_visibility
(v
, self, v
.module, false)
643 var psig
= prop
.signature_for
(type_lvalue
)
644 _assign_method
= prop
645 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
646 return psig
.return_type
.not_for_self
649 redef fun assign_method
do return _assign_method
.as(not null)
650 var _assign_method
: nullable MMMethod
653 redef class AVarReassignExpr
654 redef fun after_typing
(v
)
656 v
.variable_ctx
.check_is_set
(self, variable
)
657 v
.variable_ctx
.mark_is_set
(variable
)
658 var t
= v
.variable_ctx
.stype
(variable
)
659 var t2
= do_rvalue_typing
(v
, t
)
660 if t2
== null then return
662 # Check the base type
663 var btype
= v
.base_variable_ctx
.stype
(variable
)
664 if not v
.check_conform
(n_value
, t2
, btype
) then return
667 v
.variable_ctx
.stype
(variable
) = t2
673 redef class PAssignOp
674 fun method_name
: Symbol is abstract
676 redef class APlusAssignOp
677 redef fun method_name
do return once
"+".to_symbol
679 redef class AMinusAssignOp
680 redef fun method_name
do return once
"-".to_symbol
683 redef class ASelfExpr
684 var _variable
: nullable ParamVariable
685 redef fun variable
do return _variable
.as(not null)
687 redef fun its_variable
do return variable
689 redef fun after_typing
(v
)
691 _variable
= v
.self_var
692 _stype
= v
.variable_ctx
.stype
(variable
)
696 redef fun is_self
do return true
699 redef class AImplicitSelfExpr
700 redef fun is_implicit_self
do return true
703 redef class AIfexprExpr
704 redef fun accept_typing
(v
)
706 var old_var_ctx
= v
.variable_ctx
708 v
.enter_visit
(n_expr
)
709 v
.use_if_true_variable_ctx
(n_expr
)
710 v
.enter_visit
(n_then
)
711 v
.variable_ctx
= old_var_ctx
712 v
.use_if_false_variable_ctx
(n_expr
)
713 v
.enter_visit
(n_else
)
715 v
.check_conform_expr
(n_expr
, v
.type_bool
)
717 _stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
718 _is_typed
= _stype
!= null
722 redef class ABoolExpr
723 redef fun after_typing
(v
)
731 redef fun accept_typing
(v
)
733 var old_var_ctx
= v
.variable_ctx
735 v
.enter_visit
(n_expr
)
736 v
.use_if_false_variable_ctx
(n_expr
)
738 v
.enter_visit
(n_expr2
)
739 if n_expr2
.if_false_variable_ctx
!= null then
740 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
742 _if_false_variable_ctx
= v
.variable_ctx
745 v
.variable_ctx
= old_var_ctx
747 v
.check_conform_expr
(n_expr
, v
.type_bool
)
748 v
.check_conform_expr
(n_expr2
, v
.type_bool
)
755 redef fun accept_typing
(v
)
757 var old_var_ctx
= v
.variable_ctx
759 v
.enter_visit
(n_expr
)
760 v
.use_if_true_variable_ctx
(n_expr
)
762 v
.enter_visit
(n_expr2
)
763 if n_expr2
.if_true_variable_ctx
!= null then
764 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
766 _if_true_variable_ctx
= v
.variable_ctx
769 v
.variable_ctx
= old_var_ctx
771 v
.check_conform_expr
(n_expr
, v
.type_bool
)
772 v
.check_conform_expr
(n_expr2
, v
.type_bool
)
779 redef fun after_typing
(v
)
781 v
.check_conform_expr
(n_expr
, v
.type_bool
)
783 # Invert if_true/if_false information
784 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
785 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
793 redef fun after_typing
(v
)
800 redef class AFloatExpr
801 redef fun after_typing
(v
)
803 _stype
= v
.type_float
808 redef class ACharExpr
809 redef fun after_typing
(v
)
816 redef class AStringFormExpr
817 var _meth_with_native
: nullable MMMethod
818 redef fun meth_with_native
: MMMethod do return _meth_with_native
.as(not null)
819 redef fun after_typing
(v
)
821 _stype
= v
.type_string
823 _meth_with_native
= _stype
.local_class
.select_method
(once
"with_native".to_symbol
)
824 if _meth_with_native
== null then v
.error
(self, "{_stype} MUST have a with_native method.")
828 redef class ASuperstringExpr
829 redef fun meth_with_capacity
: MMMethod do return _meth_with_capacity
.as(not null)
830 var _meth_with_capacity
: nullable MMMethod
831 redef fun meth_add
: MMMethod do return _meth_add
.as(not null)
832 var _meth_add
: nullable MMMethod
833 redef fun meth_to_s
: MMMethod do return _meth_to_s
.as(not null)
834 var _meth_to_s
: nullable MMMethod
835 redef fun atype
do return _atype
.as(not null)
836 var _atype
: nullable MMType
837 redef fun after_typing
(v
)
839 var stype
= v
.type_string
841 var atype
= v
.type_array
(stype
)
843 _meth_with_capacity
= atype
.local_class
.select_method
(once
"with_capacity".to_symbol
)
844 if _meth_with_capacity
== null then v
.error
(self, "{_atype} MUST have a with_capacity method.")
845 _meth_add
= atype
.local_class
.select_method
(once
"add".to_symbol
)
846 if _meth_add
== null then v
.error
(self, "{_atype} MUST have an add method.")
847 _meth_to_s
= v
.type_object
.local_class
.select_method
(once
"to_s".to_symbol
)
848 if _meth_to_s
== null then v
.error
(self, "Object MUST have a to_s method.")
853 redef class ANullExpr
854 redef fun after_typing
(v
)
861 redef class AArrayExpr
862 redef fun meth_with_capacity
: MMMethod do return _meth_with_capacity
.as(not null)
863 var _meth_with_capacity
: nullable MMMethod
864 redef fun meth_add
: MMMethod do return _meth_add
.as(not null)
865 var _meth_add
: nullable MMMethod
867 redef fun after_typing
(v
)
869 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
870 if stype
!= null then do_typing
(v
, stype
)
873 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
875 _stype
= v
.type_array
(element_type
)
877 _meth_with_capacity
= _stype
.local_class
.select_method
(once
"with_capacity".to_symbol
)
878 if _meth_with_capacity
== null then v
.error
(self, "{_stype} MUST have a with_capacity method.")
879 _meth_add
= _stype
.local_class
.select_method
(once
"add".to_symbol
)
880 if _meth_add
== null then v
.error
(self, "{_stype} MUST have an add method.")
886 redef class ARangeExpr
887 redef fun meth_init
: MMMethod do return _meth_init
.as(not null)
888 var _meth_init
: nullable MMMethod
889 redef fun after_typing
(v
)
891 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
892 var ntype
= n_expr
.stype
893 var ntype2
= n_expr2
.stype
894 if ntype
< ntype2
then
896 else if not ntype2
< ntype
then
897 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
900 var dtype
= v
.type_discrete
901 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
902 _stype
= v
.type_range
(ntype
)
907 redef class ACrangeExpr
908 redef fun after_typing
(v
)
911 if not is_typed
then return
912 _meth_init
= stype
.local_class
.select_method
(once
"init".to_symbol
)
915 redef class AOrangeExpr
916 redef fun after_typing
(v
)
919 if not is_typed
then return
920 _meth_init
= stype
.local_class
.select_method
(once
"without_last".to_symbol
)
925 redef class ASuperExpr
926 redef readable var _init_in_superclass
: nullable MMMethod
927 redef fun after_typing
(v
)
929 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
930 if not precs
.is_empty
then
931 v
.local_property
.need_super
= true
932 else if v
.local_property
.global
.is_init
then
933 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
934 for p
in base_precs
do
935 if not p
.global
.is_init
then
936 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
938 precs
.add
(v
.local_class
[p
.global
])
941 if precs
.is_empty
then
942 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
944 else if precs
.length
> 1 then
945 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
948 var p
= base_precs
.first
949 assert p
isa MMMethod
950 _init_in_superclass
= p
951 register_super_init_call
(v
, p
)
952 if n_args
.length
> 0 then
953 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
954 _arguments
= process_signature
(v
, signature
, p
.name
, n_args
.to_a
)
957 v
.error
(self, "Error: No super method to call for {v.local_property}.")
961 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
962 var stypes
= new Array[MMType]
963 var stype
: nullable MMType = null
965 assert prop
isa MMMethod
966 var t
= prop
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
.for_module
(v
.module).adapt_to
(v
.local_property
.signature
.recv
)
968 if stype
== null or stype
< t
then
973 v
.check_conform
(self, t
, stype
.as(not null))
977 var p
= v
.local_property
978 assert p
isa MMSrcMethod
984 redef class AAttrFormExpr
985 redef fun prop
do return _prop
.as(not null)
986 var _prop
: nullable MMAttribute
988 redef fun attr_type
do return _attr_type
.as(not null)
989 var _attr_type
: nullable MMType
991 # Compute the attribute accessed
992 private fun do_typing
(v
: TypingVisitor)
994 if not v
.check_expr
(n_expr
) then return
995 var type_recv
= n_expr
.stype
996 var name
= n_id
.to_symbol
997 var lc
= type_recv
.local_class
998 if not lc
.has_global_property_by_name
(name
) then
999 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
1002 var prop
= lc
.select_attribute
(name
)
1003 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
1004 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
1007 var at
= prop
.signature_for
(type_recv
).return_type
1008 if not n_expr
.is_self
then at
= at
.not_for_self
1013 redef class AAttrExpr
1014 redef fun after_typing
(v
)
1017 if _prop
== null then return
1023 redef class AAttrAssignExpr
1024 redef fun after_typing
(v
)
1027 if _prop
== null then return
1028 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1033 redef class AAttrReassignExpr
1034 redef fun after_typing
(v
)
1037 if _prop
== null then return
1038 var t
= do_rvalue_typing
(v
, attr_type
)
1039 if t
== null then return
1040 v
.check_conform
(self, t
, n_value
.stype
)
1045 redef class AIssetAttrExpr
1046 redef fun after_typing
(v
)
1049 if _prop
== null then return
1050 if attr_type
.is_nullable
then
1051 v
.error
(self, "Error: isset on a nullable attribute.")
1053 _stype
= v
.type_bool
1058 redef class AAbsAbsSendExpr
1059 # The signature of the called property
1060 redef fun prop_signature
do return _prop_signature
.as(not null)
1061 var _prop_signature
: nullable MMSignature
1063 # The real arguments used (after star transformation) (once computed)
1064 redef fun arguments
do return _arguments
.as(not null)
1065 var _arguments
: nullable Array[PExpr]
1067 # Check the conformity of a set of arguments `raw_args' to a signature.
1068 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[PExpr]): nullable Array[PExpr]
1070 var par_vararg
= psig
.vararg_rank
1071 var par_arity
= psig
.arity
1073 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1074 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1075 v
.error
(self, "Error: '{name}' arity missmatch.")
1079 var args
= new Array[PExpr]
1080 for par_idx
in [0..par_arity
[ do
1082 var par_type
= psig
[par_idx
]
1083 if par_idx
== par_vararg
then
1084 var star
= new Array[PExpr]
1085 for i
in [0..(raw_arity-par_arity
)] do
1086 a
= raw_args
[arg_idx
]
1087 v
.check_conform_expr
(a
, par_type
)
1089 arg_idx
= arg_idx
+ 1
1091 var aa
= new AArrayExpr.init_aarrayexpr
(star
)
1092 aa
.do_typing
(v
, par_type
)
1095 a
= raw_args
[arg_idx
]
1096 v
.check_conform_expr
(a
, par_type
)
1097 arg_idx
= arg_idx
+ 1
1104 # Check the conformity of a set of defined closures
1105 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[PClosureDef]): nullable MMType
1107 var t
= psig
.return_type
1108 var cs
= psig
.closures
# Declared closures
1111 if not c
.is_optional
then min_arity
+= 1
1114 if cs
.length
== 0 then
1115 v
.error
(self, "Error: {name} does not require blocks.")
1116 else if cd
.length
> cs
.length
or cd
.length
< min_arity
then
1117 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1119 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1120 var break_list
: nullable Array[ABreakExpr] = null
1121 if t
!= null then break_list
= new Array[ABreakExpr]
1123 # Process each closure definition
1124 for i
in [0..cd
.length
[ do
1127 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1128 v
.escapable_ctx
.push
(esc
)
1129 cdi
.accept_typing2
(v
, esc
)
1133 # Check break type conformity
1134 if break_list
!= null then
1135 t
= v
.check_conform_multiexpr
(t
, break_list
)
1138 else if min_arity
!= 0 then
1139 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1145 redef class AAbsSendExpr
1146 # Compute the called global property
1147 private fun do_typing
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, recv_is_self
: Bool, name
: Symbol, raw_args
: nullable Array[PExpr], closure_defs
: nullable Array[PClosureDef])
1149 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1150 if prop
== null then return
1151 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1152 var args
= process_signature
(v
, sig
, prop
.name
, raw_args
)
1153 if args
== null then return
1154 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1155 if rtype
== null and sig
.return_type
!= null then return
1157 _prop_signature
= sig
1159 _return_type
= rtype
1162 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1164 var lc
= type_recv
.local_class
1165 var prop
: nullable MMMethod = null
1166 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1167 if prop
== null and v
.local_property
.global
.is_init
then
1168 var props
= type_recv
.local_class
.super_methods_named
(name
)
1169 if props
.length
> 1 then
1170 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1172 else if props
.length
== 1 then
1173 var p
= type_recv
.local_class
[props
.first
.global
]
1174 assert p
isa MMMethod
1179 if prop
== null then
1180 if is_implicit_self
then
1181 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1183 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1190 # Get the signature for a local property and a receiver
1191 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1193 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1194 var psig
= prop
.signature_for
(type_recv
)
1195 if not recv_is_self
then psig
= psig
.not_for_self
1199 # The invoked method (once computed)
1200 redef fun prop
do return _prop
.as(not null)
1201 var _prop
: nullable MMMethod
1203 # The return type (if any) (once computed)
1204 redef readable var _return_type
: nullable MMType
1207 # A possible call of constructor in a super class
1208 # Could be an explicit call or with the 'super' keyword
1209 redef class ASuperInitCall
1210 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1212 if parent
!= v
.top_block
and self != v
.top_block
then
1213 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1215 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1216 var prev_class
: nullable MMLocalClass = null
1217 var esic
= v
.explicit_super_init_calls
.as(not null)
1218 if not esic
.is_empty
then
1219 prev_class
= esic
.last
.global
.intro
.local_class
1221 var order
= v
.local_class
.cshe
.reverse_linear_extension
1222 if cla
== v
.local_class
then
1223 v
.explicit_other_init_call
= true
1224 else if not order
.has
(cla
) then
1225 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1226 else if cla
== prev_class
then
1227 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1229 var last_is_found
= prev_class
== null
1231 if c
== prev_class
then
1232 last_is_found
= true
1233 else if c
== cla
then
1234 if not last_is_found
then
1235 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1246 redef class ANewExpr
1247 redef fun after_typing
(v
)
1249 if not n_type
.is_typed
then return
1250 var t
= n_type
.stype
1251 if t
.local_class
.global
.is_abstract
then
1252 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1256 if n_id
== null then
1257 name
= once
"init".to_symbol
1259 name
= n_id
.to_symbol
1262 do_typing
(v
, t
, false, false, name
, n_args
.to_a
, null)
1263 if _prop
== null then return
1265 if not prop
.global
.is_init
then
1266 v
.error
(self, "Error: {prop} is not a constructor.")
1275 redef class ASendExpr
1276 # Name of the invoked property
1277 fun name
: Symbol is abstract
1279 # Raw arguments used (withour star transformation)
1280 fun raw_arguments
: nullable Array[PExpr] is abstract
1282 # Closure definitions
1283 redef fun closure_defs
: nullable Array[PClosureDef] do return null
1285 redef fun after_typing
(v
)
1290 private fun do_all_typing
(v
: TypingVisitor)
1292 if not v
.check_expr
(n_expr
) then return
1293 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1294 if _prop
== null then return
1295 var prop
= _prop
.as(not null)
1297 if prop
.global
.is_init
then
1298 if not v
.local_property
.global
.is_init
then
1299 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1300 else if not n_expr
.is_self
then
1301 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1303 register_super_init_call
(v
, prop
)
1307 _stype
= return_type
1312 redef class ASendReassignExpr
1313 redef fun read_prop
do return _read_prop
.as(not null)
1314 var _read_prop
: nullable MMMethod
1315 redef fun do_all_typing
(v
)
1317 if not v
.check_expr
(n_expr
) then return
1318 var raw_args
= raw_arguments
1319 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1321 if prop
== null then return
1322 if prop
.global
.is_init
then
1323 if not v
.local_property
.global
.is_init
then
1324 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1325 else if not n_expr
.is_self
then
1326 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1329 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1330 if not n_expr
.is_self
then t
= t
.not_for_self
1332 var t2
= do_rvalue_typing
(v
, t
)
1333 if t2
== null then return
1334 v
.check_conform
(self, t2
, n_value
.stype
)
1337 var old_args
= arguments
1338 raw_args
.add
(n_value
)
1340 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1341 if prop
.global
.is_init
then
1342 if not v
.local_property
.global
.is_init
then
1343 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1344 else if not n_expr
.is_self
then
1345 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1349 _arguments
= old_args
# FIXME: What if star parameters do not match betwen the two methods?
1354 redef class ABinopExpr
1355 redef fun raw_arguments
do return [n_expr2
]
1358 redef fun name
do return once
"==".to_symbol
1359 redef fun after_typing
(v
)
1362 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1363 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1364 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1365 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1368 if n_expr
.stype
isa MMTypeNone then
1369 try_to_isa
(v
, n_expr2
)
1370 else if n_expr2
.stype
isa MMTypeNone then
1371 try_to_isa
(v
, n_expr
)
1375 private fun try_to_isa
(v
: TypingVisitor, n
: PExpr)
1377 var variable
= n
.its_variable
1378 if variable
!= null then
1379 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1384 redef fun name
do return once
"!=".to_symbol
1385 redef fun after_typing
(v
)
1388 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1389 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1390 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1391 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1394 if n_expr
.stype
isa MMTypeNone then
1395 try_to_isa
(v
, n_expr2
)
1396 else if n_expr2
.stype
isa MMTypeNone then
1397 try_to_isa
(v
, n_expr
)
1401 private fun try_to_isa
(v
: TypingVisitor, n
: PExpr)
1403 var variable
= n
.its_variable
1404 if variable
!= null then
1405 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1410 redef fun name
do return once
"<".to_symbol
1413 redef fun name
do return once
"<=".to_symbol
1416 redef fun name
do return once
">".to_symbol
1419 redef fun name
do return once
">=".to_symbol
1421 redef class APlusExpr
1422 redef fun name
do return once
"+".to_symbol
1424 redef class AMinusExpr
1425 redef fun name
do return once
"-".to_symbol
1427 redef class AStarshipExpr
1428 redef fun name
do return once
"<=>".to_symbol
1430 redef class AStarExpr
1431 redef fun name
do return once
"*".to_symbol
1433 redef class ASlashExpr
1434 redef fun name
do return once
"/".to_symbol
1436 redef class APercentExpr
1437 redef fun name
do return once
"%".to_symbol
1440 redef class AUminusExpr
1441 redef fun name
do return once
"unary -".to_symbol
1442 redef fun raw_arguments
do return null
1445 redef class ACallFormExpr
1446 redef fun after_typing
(v
)
1448 if n_expr
.is_implicit_self
then
1449 var name
= n_id
.to_symbol
1450 var variable
= v
.variable_ctx
[name
]
1451 if variable
!= null then
1452 if variable
isa ClosureVariable then
1453 var n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1455 n
._variable
= variable
1459 if not n_args
.is_empty
then
1460 v
.error
(self, "Error: {name} is variable, not a function.")
1463 var vform
= variable_create
(variable
)
1464 vform
._variable
= variable
1466 vform
.after_typing
(v
)
1475 redef fun closure_defs
1477 if n_closure_defs
.is_empty
then
1480 return n_closure_defs
.to_a
1484 # Create a variable acces corresponding to the call form
1485 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1488 redef class ACallExpr
1489 redef fun variable_create
(variable
)
1491 return new AVarExpr.init_avarexpr
(n_id
)
1494 redef fun name
do return n_id
.to_symbol
1495 redef fun raw_arguments
do return n_args
.to_a
1498 redef class ACallAssignExpr
1499 redef fun variable_create
(variable
)
1501 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1504 redef fun name
do return (n_id
.text
+ "=").to_symbol
1505 redef fun raw_arguments
do
1506 var res
= n_args
.to_a
1512 redef class ACallReassignExpr
1513 redef fun variable_create
(variable
)
1515 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1518 redef fun name
do return n_id
.to_symbol
1519 redef fun raw_arguments
do return n_args
.to_a
1522 redef class ABraExpr
1523 redef fun name
do return once
"[]".to_symbol
1524 redef fun raw_arguments
do return n_args
.to_a
1527 redef class ABraAssignExpr
1528 redef fun name
do return once
"[]=".to_symbol
1529 redef fun raw_arguments
do
1530 var res
= n_args
.to_a
1536 redef class ABraReassignExpr
1537 redef fun name
do return once
"[]".to_symbol
1538 redef fun raw_arguments
do return n_args
.to_a
1541 redef class AInitExpr
1542 redef fun name
do return once
"init".to_symbol
1543 redef fun raw_arguments
do return n_args
.to_a
1546 redef class AClosureCallExpr
1547 var _variable
: nullable ClosureVariable
1548 redef fun variable
do return _variable
.as(not null)
1550 redef fun after_typing
(v
)
1553 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1554 var sig
= va
.closure
.signature
1555 var args
= process_signature
(v
, sig
, n_id
.to_symbol
, n_args
.to_a
)
1556 if not n_closure_defs
.is_empty
then
1557 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1559 if args
== null then return
1560 _prop_signature
= sig
1562 _stype
= sig
.return_type
1567 redef class PClosureDef
1568 var _closure
: nullable MMClosure
1569 redef fun closure
do return _closure
.as(not null)
1571 # The corresponding escapable object
1572 readable var _escapable
: nullable EscapableBlock
1574 var _accept_typing2
: Bool = false
1575 redef fun accept_typing
(v
)
1577 # Typing is deferred, wait accept_typing2(v)
1578 if _accept_typing2
then super
1581 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure) is abstract
1584 redef class AClosureDef
1585 redef fun accept_typing2
(v
, esc
)
1589 var sig
= esc
.closure
.signature
1590 if sig
.arity
!= n_id
.length
then
1591 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_id.length} found.")
1595 _closure
= esc
.closure
1597 var old_var_ctx
= v
.variable_ctx
1598 var old_base_var_ctx
= v
.base_variable_ctx
1599 v
.base_variable_ctx
= v
.variable_ctx
1600 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1601 variables
= new Array[AutoVariable]
1602 for i
in [0..n_id
.length
[ do
1603 var va
= new AutoVariable(n_id
[i
].to_symbol
, self)
1606 v
.variable_ctx
.add
(va
)
1609 _accept_typing2
= true
1612 if v
.variable_ctx
.unreash
== false then
1613 if closure
.signature
.return_type
!= null then
1614 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1615 else if closure
.is_break
then
1616 v
.error
(self, "Control error: Reached end of break block (a 'break' was expected).")
1619 v
.variable_ctx
= old_var_ctx
1620 v
.base_variable_ctx
= old_base_var_ctx
1624 class ATypeCheckExpr
1626 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: PExpr, n_type
: PType)
1628 if not v
.check_expr
(n_expr
) then return
1629 if not n_type
.is_typed
then return
1630 var etype
= n_expr
.stype
1631 var ttype
= n_type
.stype
1632 if etype
== ttype
then
1633 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1634 else if etype
< ttype
then
1635 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1636 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1637 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1638 # No warning in this case since with
1639 # type T: nullable A
1641 # 'x.as(not null)' != 'x.as(T)'
1642 # 'x != null' != 'x isa T'
1643 else if self isa AIsaExpr then
1644 v
.warning
(self, "Warning: Prefer '!= null'.")
1646 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1652 redef class AIsaExpr
1653 special ATypeCheckExpr
1654 redef fun after_typing
(v
)
1656 check_expr_cast
(v
, n_expr
, n_type
)
1657 if not n_type
.is_typed
then return
1658 var variable
= n_expr
.its_variable
1659 if variable
!= null then
1660 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1662 _stype
= v
.type_bool
1667 redef class AAsCastExpr
1668 special ATypeCheckExpr
1669 redef fun after_typing
(v
)
1671 check_expr_cast
(v
, n_expr
, n_type
)
1672 if not n_type
.is_typed
then return
1673 _stype
= n_type
.stype
1674 _is_typed
= _stype
!= null
1678 redef class AAsNotnullExpr
1679 redef fun after_typing
(v
)
1681 if not v
.check_expr
(n_expr
) then return
1682 var t
= n_expr
.stype
1683 if t
isa MMTypeNone then
1684 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1686 else if not t
.is_nullable
then
1687 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1689 _stype
= n_expr
.stype
.as_notnull
1694 redef class AProxyExpr
1695 redef fun after_typing
(v
)
1697 if not n_expr
.is_typed
then return
1699 if n_expr
.is_statement
then return
1700 _stype
= n_expr
.stype
1704 redef class AOnceExpr
1705 redef fun accept_typing
(v
)
1707 if v
.once_count
> 0 then
1708 v
.warning
(self, "Useless once in a once expression.")
1710 v
.once_count
= v
.once_count
+ 1
1714 v
.once_count
= v
.once_count
- 1