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 AExpr
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
: AExpr)
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
: AExpr)
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
: ANode, 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}.")
139 redef class VarVariable
140 redef readable var _is_typed
: Bool = false
143 ###############################################################################
146 private fun accept_typing
(v
: TypingVisitor)
148 accept_abs_syntax_visitor
(v
)
151 private fun after_typing
(v
: TypingVisitor) do end
154 redef class AClassdef
155 redef fun accept_typing
(v
)
157 v
.variable_ctx
= new RootVariableContext(v
, self)
158 v
.base_variable_ctx
= v
.variable_ctx
159 v
.self_var
= new ParamVariable("self".to_symbol
, self)
160 v
.self_var
.stype
= local_class
.get_type
166 redef fun self_var
do return _self_var
.as(not null)
167 var _self_var
: nullable ParamVariable
170 redef class AAttrPropdef
171 redef fun accept_typing
(v
)
173 var old_var_ctx
= v
.variable_ctx
174 v
.variable_ctx
= old_var_ctx
.sub
(self)
175 _self_var
= v
.self_var
177 if n_expr
!= null then
178 v
.check_conform_expr
(n_expr
.as(not null), prop
.signature
.return_type
.as(not null))
180 v
.variable_ctx
= old_var_ctx
184 redef class AMethPropdef
185 redef fun accept_typing
(v
)
187 var old_var_ctx
= v
.variable_ctx
188 v
.variable_ctx
= old_var_ctx
.sub
(self)
189 _self_var
= v
.self_var
191 v
.variable_ctx
= old_var_ctx
195 redef class AConcreteMethPropdef
196 redef fun after_typing
(v
)
199 if v
.variable_ctx
.unreash
== false and method
.signature
.return_type
!= null then
200 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
205 redef class AConcreteInitPropdef
206 redef fun accept_typing
(v
)
208 v
.top_block
= n_block
209 v
.explicit_super_init_calls
= explicit_super_init_calls
210 v
.explicit_other_init_call
= false
214 redef fun after_typing
(v
)
217 if v
.explicit_other_init_call
or method
.global
.intro
!= method
then
221 var l
= explicit_super_init_calls
.length
222 var cur_m
: nullable MMMethod = null
223 var cur_c
: nullable MMLocalClass = null
225 cur_m
= explicit_super_init_calls
[i
]
226 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
229 while j
< v
.local_class
.cshe
.direct_greaters
.length
do
230 var c
= v
.local_class
.cshe
.direct_greaters
[j
]
231 if c
.global
.is_interface
or c
.global
.is_universal
or c
.global
.is_mixin
then
233 else if cur_c
!= null and (c
.cshe
<= cur_c
or cur_c
.global
.is_mixin
) then
234 if c
== cur_c
then j
+= 1
235 super_init_calls
.add
(cur_m
.as(not null))
238 cur_m
= explicit_super_init_calls
[i
]
239 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
245 var p
= v
.get_default_constructor_for
(self, c
, method
)
247 super_init_calls
.add
(p
)
257 redef fun after_typing
(v
)
259 v
.variable_ctx
.add
(variable
)
263 redef class AClosureDecl
264 # The corresponding escapable object
265 readable var _escapable
: nullable EscapableBlock
267 redef fun accept_typing
(v
)
269 # Register the closure for ClosureCallExpr
270 v
.variable_ctx
.add
(variable
)
272 var old_var_ctx
= v
.variable_ctx
273 var old_base_var_ctx
= v
.base_variable_ctx
274 v
.base_variable_ctx
= v
.variable_ctx
275 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
277 var blist
: nullable Array[AExpr] = null
278 var t
= v
.local_property
.signature
.return_type
279 if t
!= null then blist
= new Array[AExpr]
280 var escapable
= new EscapableClosure(self, variable
.closure
, blist
)
281 _escapable
= escapable
282 v
.escapable_ctx
.push
(escapable
, null)
286 if n_expr
!= null then
287 if v
.variable_ctx
.unreash
== false then
288 if variable
.closure
.signature
.return_type
!= null then
289 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
290 else if variable
.closure
.is_break
then
291 v
.error
(self, "Control error: Reached end of break block (an 'abort' was expected).")
295 if blist
!= null then for x
in blist
do
296 v
.check_conform_expr
(x
, t
)
299 old_var_ctx
.merge
(v
.variable_ctx
)
300 v
.variable_ctx
= old_var_ctx
301 v
.base_variable_ctx
= old_base_var_ctx
307 redef fun stype
: MMType do return _stype
.as(not null)
308 redef fun is_typed
: Bool do return _stype
!= null
309 var _stype
: nullable MMType
311 redef fun after_typing
(v
)
313 _stype
= get_stype
(v
)
318 redef readable var _is_typed
: Bool = false
319 redef fun is_statement
: Bool do return _stype
== null
323 print
"{location}: not is_typed"
327 print
"{location}: is_statement"
330 return _stype
.as(not null)
332 var _stype
: nullable MMType
334 redef fun after_typing
(v
)
336 # Default behavior is to be happy
340 # Is the expression the implicit receiver
341 fun is_implicit_self
: Bool do return false
343 # Is the expression the current receiver (implicit or explicit)
344 fun is_self
: Bool do return false
346 # The variable accessed is any
347 fun its_variable
: nullable Variable do return null
349 # The variable type information if current boolean expression is true
350 readable private var _if_true_variable_ctx
: nullable VariableContext
352 # The variable type information if current boolean expression is false
353 readable private var _if_false_variable_ctx
: nullable VariableContext
356 redef class AVardeclExpr
357 var _variable
: nullable VarVariable
358 redef fun variable
do return _variable
.as(not null)
360 redef fun after_typing
(v
)
362 var va
= new VarVariable(n_id
.to_symbol
, n_id
)
364 v
.variable_ctx
.add
(va
)
366 if ne
!= null then v
.variable_ctx
.mark_is_set
(va
)
368 if n_type
!= null then
369 if not n_type
.is_typed
then return
370 va
.stype
= n_type
.stype
372 v
.check_conform_expr
(ne
, va
.stype
)
374 else if ne
!= null then
375 if not v
.check_expr
(ne
) then return
376 va
.stype
= n_expr
.stype
383 redef class ABlockExpr
384 redef fun accept_typing
(v
)
386 var old_var_ctx
= v
.variable_ctx
387 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
390 if v
.variable_ctx
.unreash
and not v
.variable_ctx
.already_unreash
then
391 v
.variable_ctx
.already_unreash
= true
392 v
.warning
(e
, "Warning: unreachable statement.")
397 old_var_ctx
.merge
(v
.variable_ctx
)
398 v
.variable_ctx
= old_var_ctx
403 redef class AReturnExpr
404 redef fun after_typing
(v
)
406 v
.variable_ctx
.unreash
= true
407 var t
= v
.local_property
.signature
.return_type
409 if e
== null and t
!= null then
410 v
.error
(self, "Error: Return without value in a function.")
411 else if e
!= null and t
== null then
412 v
.error
(self, "Error: Return with value in a procedure.")
413 else if e
!= null and t
!= null then
414 v
.check_conform_expr
(e
, t
)
420 redef class AContinueExpr
421 redef fun after_typing
(v
)
423 v
.variable_ctx
.unreash
= true
424 var esc
= compute_escapable_block
(v
.escapable_ctx
)
425 if esc
== null then return
427 if esc
.is_break_block
then
428 v
.error
(self, "Error: cannot 'continue', only 'break'.")
432 var t
= esc
.continue_stype
433 if n_expr
== null and t
!= null then
434 v
.error
(self, "Error: continue with a value required in this block.")
435 else if n_expr
!= null and t
== null then
436 v
.error
(self, "Error: continue without value required in this block.")
437 else if n_expr
!= null and t
!= null then
438 v
.check_conform_expr
(n_expr
.as(not null), t
)
444 redef class ABreakExpr
445 redef fun after_typing
(v
)
447 v
.variable_ctx
.unreash
= true
448 var esc
= compute_escapable_block
(v
.escapable_ctx
)
449 if esc
== null then return
451 var bl
= esc
.break_list
452 if n_expr
== null and bl
!= null then
453 v
.error
(self, "Error: break with a value required in this block.")
454 else if n_expr
!= null and bl
== null then
455 v
.error
(self, "Error: break without value required in this block.")
456 else if n_expr
!= null and bl
!= null then
457 # Typing check can only be done later
458 bl
.add
(n_expr
.as(not null))
464 redef class AAbortExpr
465 redef fun after_typing
(v
)
467 v
.variable_ctx
.unreash
= true
473 # The corresponding escapable block
474 readable var _escapable
: nullable EscapableBlock
476 redef fun accept_typing
(v
)
478 var escapable
= new BreakOnlyEscapableBlock(self)
479 _escapable
= escapable
480 v
.escapable_ctx
.push
(escapable
, n_label
)
490 redef fun accept_typing
(v
)
492 var old_var_ctx
= v
.variable_ctx
493 v
.enter_visit
(n_expr
)
494 v
.check_conform_expr
(n_expr
, v
.type_bool
)
496 # Prepare 'then' context
497 v
.use_if_true_variable_ctx
(n_expr
)
500 if n_then
!= null then
501 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
.as(not null))
502 v
.enter_visit
(n_then
)
505 # Remember what appened in the 'then'
506 var then_var_ctx
= v
.variable_ctx
508 # Prepare 'else' context
509 v
.variable_ctx
= old_var_ctx
510 v
.use_if_false_variable_ctx
(n_expr
)
513 if n_else
!= null then
514 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
.as(not null))
515 v
.enter_visit
(n_else
)
518 # Merge 'then' and 'else' contexts
519 old_var_ctx
.merge2
(then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
520 v
.variable_ctx
= old_var_ctx
525 redef class AWhileExpr
526 # The corresponding escapable block
527 readable var _escapable
: nullable EscapableBlock
529 redef fun accept_typing
(v
)
531 var escapable
= new EscapableBlock(self)
532 _escapable
= escapable
533 v
.escapable_ctx
.push
(escapable
, n_label
)
534 var old_var_ctx
= v
.variable_ctx
535 var old_base_var_ctx
= v
.base_variable_ctx
536 v
.base_variable_ctx
= v
.variable_ctx
537 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
540 v
.enter_visit
(n_expr
)
541 v
.check_conform_expr
(n_expr
, v
.type_bool
)
543 # Prepare inside context (assert cond)
544 v
.use_if_true_variable_ctx
(n_expr
)
547 if n_block
!= null then
548 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
549 v
.enter_visit
(n_block
)
552 v
.variable_ctx
= old_var_ctx
553 v
.base_variable_ctx
= old_base_var_ctx
559 redef class ALoopExpr
560 # The corresponding escapable block
561 readable var _escapable
: nullable EscapableBlock
563 redef fun accept_typing
(v
)
565 var escapable
= new EscapableBlock(self)
566 _escapable
= escapable
567 v
.escapable_ctx
.push
(escapable
, n_label
)
568 var old_var_ctx
= v
.variable_ctx
569 var old_base_var_ctx
= v
.base_variable_ctx
570 v
.base_variable_ctx
= v
.variable_ctx
571 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
574 if n_block
!= null then
575 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
576 v
.enter_visit
(n_block
)
579 v
.variable_ctx
= old_var_ctx
580 v
.base_variable_ctx
= old_base_var_ctx
587 var _variable
: nullable AutoVariable
588 redef fun variable
do return _variable
.as(not null)
590 # The corresponding escapable block
591 readable var _escapable
: nullable EscapableBlock
593 redef fun accept_typing
(v
)
595 var escapable
= new EscapableBlock(self)
596 _escapable
= escapable
597 v
.escapable_ctx
.push
(escapable
, n_label
)
599 var old_var_ctx
= v
.variable_ctx
600 var old_base_var_ctx
= v
.base_variable_ctx
601 v
.base_variable_ctx
= v
.variable_ctx
602 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
603 var va
= new AutoVariable(n_id
.to_symbol
, n_id
)
605 v
.variable_ctx
.add
(va
)
608 v
.enter_visit
(n_expr
)
610 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then return
611 var expr_type
= n_expr
.stype
614 var meth_iterator
= v
.get_method
(expr_type
, once
"iterator".to_symbol
)
615 var iter_type
= meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
616 var meth_item
= v
.get_method
(iter_type
, once
("item".to_symbol
))
617 var va_stype
= meth_item
.signature_for
(iter_type
).return_type
.as(not null)
618 if not n_expr
.is_self
then va_stype
= va_stype
.not_for_self
622 if n_block
!= null then v
.enter_visit
(n_block
)
625 v
.variable_ctx
= old_var_ctx
626 v
.base_variable_ctx
= old_base_var_ctx
632 redef class AAssertExpr
633 redef fun accept_typing
(v
)
636 v
.enter_visit
(n_expr
)
637 v
.check_conform_expr
(n_expr
, v
.type_bool
)
639 # Process optional 'else' part
640 if n_else
!= null then
641 var old_var_ctx
= v
.variable_ctx
642 v
.use_if_false_variable_ctx
(n_expr
)
643 v
.enter_visit
(n_else
)
644 v
.variable_ctx
= old_var_ctx
648 v
.use_if_true_variable_ctx
(n_expr
)
653 redef class AVarFormExpr
654 var _variable
: nullable Variable
655 redef fun variable
do return _variable
.as(not null)
659 redef fun its_variable
do return variable
661 redef fun after_typing
(v
)
663 v
.variable_ctx
.check_is_set
(self, variable
)
664 _stype
= v
.variable_ctx
.stype
(variable
)
665 _is_typed
= _stype
!= null
669 redef class AVarAssignExpr
670 redef fun after_typing
(v
)
672 v
.variable_ctx
.mark_is_set
(variable
)
674 # Check the base type
675 var btype
= v
.base_variable_ctx
.stype
(variable
)
676 if not v
.check_expr
(n_value
) then return
677 if btype
!= null and not v
.check_conform_expr
(n_value
, btype
) then return
680 v
.variable_ctx
.stype
(variable
) = n_value
.stype
686 redef class AReassignFormExpr
687 # Compute and check method used through the reassigment operator
688 # On success return the static type of the result of the reassigment operator
689 # Else display an error and return null
690 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
692 if type_lvalue
== null then
695 var name
= n_assign_op
.method_name
696 var lc
= type_lvalue
.local_class
697 if not lc
.has_global_property_by_name
(name
) then
698 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
701 var prop
= lc
.select_method
(name
)
702 prop
.global
.check_visibility
(v
, self, v
.module, false)
703 var psig
= prop
.signature_for
(type_lvalue
)
704 _assign_method
= prop
705 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
706 return psig
.return_type
.not_for_self
709 redef fun assign_method
do return _assign_method
.as(not null)
710 var _assign_method
: nullable MMMethod
713 redef class AVarReassignExpr
714 redef fun after_typing
(v
)
716 v
.variable_ctx
.check_is_set
(self, variable
)
717 v
.variable_ctx
.mark_is_set
(variable
)
718 var t
= v
.variable_ctx
.stype
(variable
)
719 var t2
= do_rvalue_typing
(v
, t
)
720 if t2
== null then return
722 # Check the base type
723 var btype
= v
.base_variable_ctx
.stype
(variable
)
724 if not v
.check_expr
(n_value
) then return
725 if btype
!= null and not v
.check_conform
(n_value
, t2
, btype
) then return
728 v
.variable_ctx
.stype
(variable
) = t2
734 redef class AAssignOp
735 fun method_name
: Symbol is abstract
737 redef class APlusAssignOp
738 redef fun method_name
do return once
"+".to_symbol
740 redef class AMinusAssignOp
741 redef fun method_name
do return once
"-".to_symbol
744 redef class ASelfExpr
745 var _variable
: nullable ParamVariable
746 redef fun variable
do return _variable
.as(not null)
748 redef fun its_variable
do return variable
750 redef fun after_typing
(v
)
752 _variable
= v
.self_var
753 _stype
= v
.variable_ctx
.stype
(variable
)
757 redef fun is_self
do return true
760 redef class AImplicitSelfExpr
761 redef fun is_implicit_self
do return true
764 redef class AIfexprExpr
765 redef fun accept_typing
(v
)
767 var old_var_ctx
= v
.variable_ctx
770 v
.enter_visit
(n_expr
)
771 v
.check_conform_expr
(n_expr
, v
.type_bool
)
773 # Prepare 'then' context
774 v
.use_if_true_variable_ctx
(n_expr
)
777 v
.enter_visit
(n_then
)
779 # Prepare 'else' context
780 v
.variable_ctx
= old_var_ctx
781 v
.use_if_false_variable_ctx
(n_expr
)
784 v
.enter_visit
(n_else
)
786 var stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
787 if stype
== null then return
794 redef class ABoolExpr
795 redef fun after_typing
(v
)
803 redef fun accept_typing
(v
)
805 var old_var_ctx
= v
.variable_ctx
806 var stype
= v
.type_bool
809 # Process left operand
810 v
.enter_visit
(n_expr
)
812 # Prepare right operand context
813 v
.use_if_false_variable_ctx
(n_expr
)
815 # Process right operand
816 v
.enter_visit
(n_expr2
)
817 if n_expr2
.if_false_variable_ctx
!= null then
818 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
820 _if_false_variable_ctx
= v
.variable_ctx
823 v
.variable_ctx
= old_var_ctx
825 v
.check_conform_expr
(n_expr
, stype
)
826 v
.check_conform_expr
(n_expr2
, stype
)
833 redef fun accept_typing
(v
)
835 var old_var_ctx
= v
.variable_ctx
836 var stype
= v
.type_bool
838 # Process left operand
839 v
.enter_visit
(n_expr
)
841 # Prepare right operand context
842 v
.use_if_true_variable_ctx
(n_expr
)
844 # Process right operand
845 v
.enter_visit
(n_expr2
)
846 if n_expr2
.if_true_variable_ctx
!= null then
847 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
849 _if_true_variable_ctx
= v
.variable_ctx
852 v
.variable_ctx
= old_var_ctx
854 v
.check_conform_expr
(n_expr
, stype
)
855 v
.check_conform_expr
(n_expr2
, stype
)
862 redef fun after_typing
(v
)
864 v
.check_conform_expr
(n_expr
, v
.type_bool
)
866 # Invert if_true/if_false information
867 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
868 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
876 redef fun after_typing
(v
)
883 redef class AFloatExpr
884 redef fun after_typing
(v
)
886 _stype
= v
.type_float
891 redef class ACharExpr
892 redef fun after_typing
(v
)
899 redef class AStringFormExpr
900 redef fun after_typing
(v
)
902 _stype
= v
.type_string
907 redef class ASuperstringExpr
908 redef fun atype
do return _atype
.as(not null)
909 var _atype
: nullable MMType
910 redef fun after_typing
(v
)
912 var stype
= v
.type_string
914 var atype
= v
.type_array
(stype
)
920 redef class ANullExpr
921 redef fun after_typing
(v
)
928 redef class AArrayExpr
929 redef fun after_typing
(v
)
931 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
932 if stype
!= null then do_typing
(v
, stype
)
935 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
937 _stype
= v
.type_array
(element_type
)
942 redef class ARangeExpr
943 redef fun after_typing
(v
)
945 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
946 var ntype
= n_expr
.stype
947 var ntype2
= n_expr2
.stype
948 if ntype
< ntype2
then
950 else if not ntype2
< ntype
then
951 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
954 var dtype
= v
.type_discrete
955 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
956 _stype
= v
.type_range
(ntype
)
961 redef class ASuperExpr
962 redef readable var _init_in_superclass
: nullable MMMethod
963 redef fun compute_raw_arguments
do return n_args
.to_a
964 redef fun after_typing
(v
)
966 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
967 if not precs
.is_empty
then
968 v
.local_property
.need_super
= true
969 else if v
.local_property
.global
.is_init
then
970 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
971 for p
in base_precs
do
972 if not p
.global
.is_init
then
973 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
975 precs
.add
(v
.local_class
[p
.global
])
978 if precs
.is_empty
then
979 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
981 else if precs
.length
> 1 then
982 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
985 var p
= base_precs
.first
986 assert p
isa MMMethod
987 _init_in_superclass
= p
988 register_super_init_call
(v
, p
)
989 if n_args
.length
> 0 then
990 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
991 process_signature
(v
, signature
, p
.name
, compute_raw_arguments
)
994 v
.error
(self, "Error: No super method to call for {v.local_property}.")
998 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
999 var stypes
= new Array[MMType]
1000 var stype
: nullable MMType = null
1001 for prop
in precs
do
1002 assert prop
isa MMMethod
1003 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
)
1005 if stype
== null or stype
< t
then
1010 v
.check_conform
(self, t
, stype
.as(not null))
1014 var p
= v
.local_property
1015 assert p
isa MMSrcMethod
1021 redef class AAttrFormExpr
1022 redef fun prop
do return _prop
.as(not null)
1023 var _prop
: nullable MMAttribute
1025 redef fun attr_type
do return _attr_type
.as(not null)
1026 var _attr_type
: nullable MMType
1028 # Compute the attribute accessed
1029 private fun do_typing
(v
: TypingVisitor)
1031 if not v
.check_expr
(n_expr
) then return
1032 var type_recv
= n_expr
.stype
1033 var name
= n_id
.to_symbol
1034 var lc
= type_recv
.local_class
1035 if not lc
.has_global_property_by_name
(name
) then
1036 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
1039 var prop
= lc
.select_attribute
(name
)
1040 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
1041 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
1044 var at
= prop
.signature_for
(type_recv
).return_type
1045 if not n_expr
.is_self
then at
= at
.not_for_self
1050 redef class AAttrExpr
1051 redef fun after_typing
(v
)
1054 if _prop
== null then return
1060 redef class AAttrAssignExpr
1061 redef fun after_typing
(v
)
1064 if _prop
== null then return
1065 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1070 redef class AAttrReassignExpr
1071 redef fun after_typing
(v
)
1074 if _prop
== null then return
1075 var t
= do_rvalue_typing
(v
, attr_type
)
1076 if t
== null then return
1077 v
.check_conform
(self, t
, n_value
.stype
)
1082 redef class AIssetAttrExpr
1083 redef fun after_typing
(v
)
1086 if _prop
== null then return
1087 if attr_type
.is_nullable
then
1088 v
.error
(self, "Error: isset on a nullable attribute.")
1090 _stype
= v
.type_bool
1095 redef class AAbsAbsSendExpr
1096 # The signature of the called property
1097 redef fun prop_signature
do return _prop_signature
.as(not null)
1098 var _prop_signature
: nullable MMSignature
1100 # Raw arguments used (without vararg transformation)
1101 redef fun raw_arguments
: Array[AExpr]
1103 var res
= _raw_arguments_cache
1107 res
= compute_raw_arguments
1108 if res
== null then res
= new Array[AExpr]
1109 _raw_arguments_cache
= res
1114 var _raw_arguments_cache
: nullable Array[AExpr] = null
1116 fun compute_raw_arguments
: nullable Array[AExpr]
1118 print
"{location} no compute_raw_arguments"
1122 # Check the conformity of a set of arguments `raw_args' to a signature.
1123 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[AExpr]): Bool
1125 var par_vararg
= psig
.vararg_rank
1126 var par_arity
= psig
.arity
1128 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1129 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1130 v
.error
(self, "Error: arity missmatch; prototype is '{name}{psig}'.")
1134 for par_idx
in [0..par_arity
[ do
1136 var par_type
= psig
[par_idx
]
1137 if par_idx
== par_vararg
then
1138 for i
in [0..(raw_arity-par_arity
)] do
1139 a
= raw_args
[arg_idx
]
1140 v
.check_conform_expr
(a
, par_type
)
1141 arg_idx
= arg_idx
+ 1
1144 a
= raw_args
[arg_idx
]
1145 v
.check_conform_expr
(a
, par_type
)
1146 arg_idx
= arg_idx
+ 1
1152 # Check the conformity of a set of defined closures
1153 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[AClosureDef]): nullable MMType
1155 var t
= psig
.return_type
1156 var cs
= psig
.closures
# Declared closures
1159 if not c
.is_optional
then min_arity
+= 1
1162 if cd
!= null then arity
= cd
.length
1163 if cs
.length
> 0 then
1164 if arity
== 0 and min_arity
> 0 then
1165 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1166 else if arity
> cs
.length
or arity
< min_arity
then
1167 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1169 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1170 var break_list
: nullable Array[ABreakExpr] = null
1171 if t
!= null then break_list
= new Array[ABreakExpr]
1173 # The n_label, is any in only set on the last decl
1174 var n_label
= if arity
> 0 then cd
[arity-1
].n_label
else null
1176 # Process each closure definition
1177 for i
in [0..arity
[ do
1179 var cni
= cdi
.n_id
.to_symbol
1180 var csi
= psig
.closure_named
(cni
)
1182 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1183 v
.escapable_ctx
.push
(esc
, n_label
)
1184 cdi
.accept_typing2
(v
, esc
)
1186 else if cs
.length
== 1 then
1187 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closure is !{cs.first.name}.")
1189 var a
= new Array[String]
1193 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closures are {a.join(",")}.")
1197 # Check break type conformity
1198 if break_list
!= null then
1199 t
= v
.check_conform_multiexpr
(t
, break_list
)
1202 else if arity
!= 0 then
1203 v
.error
(self, "Error: {name} does not require blocks.")
1209 redef class AAbsSendExpr
1210 # Compute the called global property
1211 private fun do_typing
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, recv_is_self
: Bool, name
: Symbol, raw_args
: nullable Array[AExpr], closure_defs
: nullable Array[AClosureDef])
1213 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1214 if prop
== null then return
1215 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1216 if not process_signature
(v
, sig
, prop
.name
, raw_args
) then return
1217 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1218 if rtype
== null and sig
.return_type
!= null then return
1220 _prop_signature
= sig
1221 _return_type
= rtype
1224 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1226 var lc
= type_recv
.local_class
1227 var prop
: nullable MMMethod = null
1228 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1229 if prop
== null and v
.local_property
.global
.is_init
then
1230 var props
= type_recv
.local_class
.super_methods_named
(name
)
1231 if props
.length
> 1 then
1232 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1234 else if props
.length
== 1 then
1235 var p
= type_recv
.local_class
[props
.first
.global
]
1236 assert p
isa MMMethod
1241 if prop
== null then
1242 if is_implicit_self
then
1243 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1245 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1252 # Get the signature for a local property and a receiver
1253 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1255 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1256 var psig
= prop
.signature_for
(type_recv
)
1257 if not recv_is_self
then psig
= psig
.not_for_self
1261 # The invoked method (once computed)
1262 redef fun prop
do return _prop
.as(not null)
1263 var _prop
: nullable MMMethod
1265 # The return type (if any) (once computed)
1266 redef readable var _return_type
: nullable MMType
1269 # A possible call of constructor in a super class
1270 # Could be an explicit call or with the 'super' keyword
1271 redef class ASuperInitCall
1272 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1274 if parent
!= v
.top_block
and self != v
.top_block
then
1275 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1277 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1278 var prev_class
: nullable MMLocalClass = null
1279 var esic
= v
.explicit_super_init_calls
.as(not null)
1280 if not esic
.is_empty
then
1281 prev_class
= esic
.last
.global
.intro
.local_class
1283 var order
= v
.local_class
.cshe
.reverse_linear_extension
1284 if cla
== v
.local_class
then
1285 v
.explicit_other_init_call
= true
1286 else if not order
.has
(cla
) then
1287 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1288 else if cla
== prev_class
then
1289 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1291 var last_is_found
= prev_class
== null
1293 if c
== prev_class
then
1294 last_is_found
= true
1295 else if c
== cla
then
1296 if not last_is_found
then
1297 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1308 redef class ANewExpr
1309 redef fun compute_raw_arguments
do return n_args
.to_a
1310 redef fun after_typing
(v
)
1312 if not n_type
.is_typed
then return
1313 var t
= n_type
.stype
1314 if t
.local_class
.global
.is_abstract
then
1315 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1319 if n_id
== null then
1320 name
= once
"init".to_symbol
1322 name
= n_id
.to_symbol
1325 do_typing
(v
, t
, false, false, name
, raw_arguments
, null)
1326 if _prop
== null then return
1328 if not prop
.global
.is_init
then
1329 v
.error
(self, "Error: {prop} is not a constructor.")
1338 redef class ASendExpr
1339 # Name of the invoked property
1340 fun name
: Symbol is abstract
1342 # Closure definitions
1343 redef fun closure_defs
: nullable Array[AClosureDef] do return null
1345 redef fun after_typing
(v
)
1350 private fun do_all_typing
(v
: TypingVisitor)
1352 if not v
.check_expr
(n_expr
) then return
1353 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1354 if _prop
== null then return
1355 var prop
= _prop
.as(not null)
1357 if prop
.global
.is_init
then
1358 if not v
.local_property
.global
.is_init
then
1359 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1360 else if not n_expr
.is_self
then
1361 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1363 register_super_init_call
(v
, prop
)
1367 _stype
= return_type
1372 redef class ASendReassignExpr
1373 redef fun read_prop
do return _read_prop
.as(not null)
1374 var _read_prop
: nullable MMMethod
1375 redef fun do_all_typing
(v
)
1377 if not v
.check_expr
(n_expr
) then return
1378 var raw_args
= raw_arguments
1379 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1381 if prop
== null then return
1382 if prop
.global
.is_init
then
1383 if not v
.local_property
.global
.is_init
then
1384 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1385 else if not n_expr
.is_self
then
1386 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1389 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1390 if not n_expr
.is_self
then t
= t
.not_for_self
1392 var t2
= do_rvalue_typing
(v
, t
)
1393 if t2
== null then return
1394 v
.check_conform
(self, t2
, n_value
.stype
)
1397 raw_args
= raw_args
.to_a
1398 raw_args
.add
(n_value
)
1400 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1401 if prop
.global
.is_init
then
1402 if not v
.local_property
.global
.is_init
then
1403 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1404 else if not n_expr
.is_self
then
1405 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1413 redef class ABinopExpr
1414 redef fun compute_raw_arguments
do return [n_expr2
]
1417 redef fun name
do return once
"==".to_symbol
1418 redef fun after_typing
(v
)
1421 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1422 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1423 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1424 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1427 if n_expr
.stype
isa MMTypeNone then
1428 try_to_isa
(v
, n_expr2
)
1429 else if n_expr2
.stype
isa MMTypeNone then
1430 try_to_isa
(v
, n_expr
)
1434 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1436 var variable
= n
.its_variable
1437 if variable
!= null then
1438 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1443 redef fun name
do return once
"!=".to_symbol
1444 redef fun after_typing
(v
)
1447 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1448 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1449 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1450 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1453 if n_expr
.stype
isa MMTypeNone then
1454 try_to_isa
(v
, n_expr2
)
1455 else if n_expr2
.stype
isa MMTypeNone then
1456 try_to_isa
(v
, n_expr
)
1460 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1462 var variable
= n
.its_variable
1463 if variable
!= null then
1464 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1469 redef fun name
do return once
"<".to_symbol
1472 redef fun name
do return once
"<=".to_symbol
1475 redef fun name
do return once
">".to_symbol
1478 redef fun name
do return once
">=".to_symbol
1480 redef class APlusExpr
1481 redef fun name
do return once
"+".to_symbol
1483 redef class AMinusExpr
1484 redef fun name
do return once
"-".to_symbol
1486 redef class AStarshipExpr
1487 redef fun name
do return once
"<=>".to_symbol
1489 redef class AStarExpr
1490 redef fun name
do return once
"*".to_symbol
1492 redef class ASlashExpr
1493 redef fun name
do return once
"/".to_symbol
1495 redef class APercentExpr
1496 redef fun name
do return once
"%".to_symbol
1499 redef class AUminusExpr
1500 redef fun name
do return once
"unary -".to_symbol
1501 redef fun compute_raw_arguments
do return null
1504 redef class ACallFormExpr
1505 redef fun after_typing
(v
)
1507 if n_expr
.is_implicit_self
then
1508 var name
= n_id
.to_symbol
1509 var variable
= v
.variable_ctx
[name
]
1510 if variable
!= null then
1512 if variable
isa ClosureVariable then
1513 n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1514 n
._variable
= variable
1516 if not n_args
.is_empty
then
1517 v
.error
(self, "Error: {name} is variable, not a function.")
1520 n
= variable_create
(variable
)
1521 n
._variable
= variable
1532 redef fun closure_defs
1534 if n_closure_defs
.is_empty
then
1537 return n_closure_defs
.to_a
1541 # Create a variable acces corresponding to the call form
1542 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1545 redef class ACallExpr
1546 redef fun variable_create
(variable
)
1548 return new AVarExpr.init_avarexpr
(n_id
)
1551 redef fun name
do return n_id
.to_symbol
1552 redef fun compute_raw_arguments
do return n_args
.to_a
1555 redef class ACallAssignExpr
1556 redef fun variable_create
(variable
)
1558 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1561 redef fun name
do return (n_id
.text
+ "=").to_symbol
1562 redef fun compute_raw_arguments
do
1563 var res
= n_args
.to_a
1569 redef class ACallReassignExpr
1570 redef fun variable_create
(variable
)
1572 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1575 redef fun name
do return n_id
.to_symbol
1576 redef fun compute_raw_arguments
do return n_args
.to_a
1579 redef class ABraExpr
1580 redef fun name
do return once
"[]".to_symbol
1581 redef fun compute_raw_arguments
do return n_args
.to_a
1582 redef fun closure_defs
1584 if n_closure_defs
.is_empty
then
1587 return n_closure_defs
.to_a
1592 redef class ABraAssignExpr
1593 redef fun name
do return once
"[]=".to_symbol
1594 redef fun compute_raw_arguments
do
1595 var res
= n_args
.to_a
1601 redef class ABraReassignExpr
1602 redef fun name
do return once
"[]".to_symbol
1603 redef fun compute_raw_arguments
do return n_args
.to_a
1606 redef class AInitExpr
1607 redef fun name
do return once
"init".to_symbol
1608 redef fun compute_raw_arguments
do return n_args
.to_a
1611 redef class AClosureCallExpr
1612 var _variable
: nullable ClosureVariable
1613 redef fun variable
do return _variable
.as(not null)
1614 redef fun compute_raw_arguments
do return n_args
.to_a
1616 redef fun after_typing
(v
)
1619 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1620 var sig
= va
.closure
.signature
1621 var s
= process_signature
(v
, sig
, n_id
.to_symbol
, compute_raw_arguments
)
1622 if not n_closure_defs
.is_empty
then
1623 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1625 if not s
then return
1626 _prop_signature
= sig
1627 _stype
= sig
.return_type
1632 redef class AClosureId
1633 fun to_symbol
: Symbol is abstract
1635 redef class ASimpleClosureId
1636 redef fun to_symbol
: Symbol do return n_id
.to_symbol
1638 redef class ABreakClosureId
1639 redef fun to_symbol
: Symbol do return n_kwbreak
.to_symbol
1642 redef class AClosureDef
1643 var _closure
: nullable MMClosure
1644 redef fun closure
do return _closure
.as(not null)
1646 # The corresponding escapable object
1647 readable var _escapable
: nullable EscapableBlock
1649 var _accept_typing2
: Bool = false
1650 redef fun accept_typing
(v
)
1652 # Typing is deferred, wait accept_typing2(v)
1653 if _accept_typing2
then super
1656 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure)
1660 var sig
= esc
.closure
.signature
1661 if sig
.arity
!= n_ids
.length
then
1662 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_ids.length} found.")
1666 _closure
= esc
.closure
1668 var old_var_ctx
= v
.variable_ctx
1669 var old_base_var_ctx
= v
.base_variable_ctx
1670 v
.base_variable_ctx
= v
.variable_ctx
1671 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1672 variables
= new Array[AutoVariable]
1673 for i
in [0..n_ids
.length
[ do
1674 var va
= new AutoVariable(n_ids
[i
].to_symbol
, n_ids
[i
])
1677 v
.variable_ctx
.add
(va
)
1680 _accept_typing2
= true
1683 if v
.variable_ctx
.unreash
== false then
1684 if closure
.signature
.return_type
!= null then
1685 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1686 else if closure
.is_break
then
1687 v
.error
(self, "Control error: Reached end of break block (a 'break' was expected).")
1690 v
.variable_ctx
= old_var_ctx
1691 v
.base_variable_ctx
= old_base_var_ctx
1695 class ATypeCheckExpr
1697 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: AExpr, n_type
: AType)
1699 if not v
.check_expr
(n_expr
) then return
1700 if not n_type
.is_typed
then return
1701 var etype
= n_expr
.stype
1702 var ttype
= n_type
.stype
1703 if etype
== ttype
then
1704 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1705 else if etype
< ttype
then
1706 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1707 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1708 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1709 # No warning in this case since with
1710 # type T: nullable A
1712 # 'x.as(not null)' != 'x.as(T)'
1713 # 'x != null' != 'x isa T'
1714 else if self isa AIsaExpr then
1715 v
.warning
(self, "Warning: Prefer '!= null'.")
1717 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1723 redef class AIsaExpr
1724 special ATypeCheckExpr
1725 redef fun after_typing
(v
)
1727 check_expr_cast
(v
, n_expr
, n_type
)
1728 if not n_type
.is_typed
then return
1729 var variable
= n_expr
.its_variable
1730 if variable
!= null then
1731 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1733 _stype
= v
.type_bool
1738 redef class AAsCastExpr
1739 special ATypeCheckExpr
1740 redef fun after_typing
(v
)
1742 check_expr_cast
(v
, n_expr
, n_type
)
1743 if not n_type
.is_typed
then return
1744 _stype
= n_type
.stype
1745 _is_typed
= _stype
!= null
1749 redef class AAsNotnullExpr
1750 redef fun after_typing
(v
)
1752 if not v
.check_expr
(n_expr
) then return
1753 var t
= n_expr
.stype
1754 if t
isa MMTypeNone then
1755 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1757 else if not t
.is_nullable
then
1758 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1760 _stype
= n_expr
.stype
.as_notnull
1765 redef class AProxyExpr
1766 redef fun after_typing
(v
)
1768 if not n_expr
.is_typed
then return
1770 if n_expr
.is_statement
then return
1771 _stype
= n_expr
.stype
1775 redef class AOnceExpr
1776 redef fun accept_typing
(v
)
1778 if v
.once_count
> 0 then
1779 v
.warning
(self, "Useless once in a once expression.")
1781 v
.once_count
= v
.once_count
+ 1
1785 v
.once_count
= v
.once_count
- 1