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 escapable
= new EscapableClosure(self, variable
.closure
, null)
278 _escapable
= escapable
279 v
.escapable_ctx
.push
(escapable
, null)
283 if n_expr
!= null then
284 if v
.variable_ctx
.unreash
== false then
285 if variable
.closure
.signature
.return_type
!= null then
286 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
287 else if variable
.closure
.is_break
then
288 v
.error
(self, "Control error: Reached end of break block (an 'abort' was expected).")
293 old_var_ctx
.merge
(v
.variable_ctx
)
294 v
.variable_ctx
= old_var_ctx
295 v
.base_variable_ctx
= old_base_var_ctx
301 redef fun stype
: MMType do return _stype
.as(not null)
302 redef fun is_typed
: Bool do return _stype
!= null
303 var _stype
: nullable MMType
305 redef fun after_typing
(v
)
307 _stype
= get_stype
(v
)
312 redef readable var _is_typed
: Bool = false
313 redef fun is_statement
: Bool do return _stype
== null
317 print
"{location}: not is_typed"
321 print
"{location}: is_statement"
324 return _stype
.as(not null)
326 var _stype
: nullable MMType
328 redef fun after_typing
(v
)
330 # Default behavior is to be happy
334 # Is the expression the implicit receiver
335 fun is_implicit_self
: Bool do return false
337 # Is the expression the current receiver (implicit or explicit)
338 fun is_self
: Bool do return false
340 # The variable accessed is any
341 fun its_variable
: nullable Variable do return null
343 # The variable type information if current boolean expression is true
344 readable private var _if_true_variable_ctx
: nullable VariableContext
346 # The variable type information if current boolean expression is false
347 readable private var _if_false_variable_ctx
: nullable VariableContext
350 redef class AVardeclExpr
351 var _variable
: nullable VarVariable
352 redef fun variable
do return _variable
.as(not null)
354 redef fun after_typing
(v
)
356 var va
= new VarVariable(n_id
.to_symbol
, n_id
)
358 v
.variable_ctx
.add
(va
)
360 if ne
!= null then v
.variable_ctx
.mark_is_set
(va
)
362 if n_type
!= null then
363 if not n_type
.is_typed
then return
364 va
.stype
= n_type
.stype
366 v
.check_conform_expr
(ne
, va
.stype
)
368 else if ne
!= null then
369 if not v
.check_expr
(ne
) then return
370 va
.stype
= n_expr
.stype
377 redef class ABlockExpr
378 redef fun accept_typing
(v
)
380 var old_var_ctx
= v
.variable_ctx
381 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
384 if v
.variable_ctx
.unreash
and not v
.variable_ctx
.already_unreash
then
385 v
.variable_ctx
.already_unreash
= true
386 v
.warning
(e
, "Warning: unreachable statement.")
391 old_var_ctx
.merge
(v
.variable_ctx
)
392 v
.variable_ctx
= old_var_ctx
397 redef class AReturnExpr
398 redef fun after_typing
(v
)
400 v
.variable_ctx
.unreash
= true
401 var t
= v
.local_property
.signature
.return_type
403 if e
== null and t
!= null then
404 v
.error
(self, "Error: Return without value in a function.")
405 else if e
!= null and t
== null then
406 v
.error
(self, "Error: Return with value in a procedure.")
407 else if e
!= null and t
!= null then
408 v
.check_conform_expr
(e
, t
)
414 redef class AContinueExpr
415 redef fun after_typing
(v
)
417 v
.variable_ctx
.unreash
= true
418 var esc
= compute_escapable_block
(v
.escapable_ctx
)
419 if esc
== null then return
421 if esc
.is_break_block
then
422 v
.error
(self, "Error: cannot 'continue', only 'break'.")
426 var t
= esc
.continue_stype
427 if n_expr
== null and t
!= null then
428 v
.error
(self, "Error: continue with a value required in this block.")
429 else if n_expr
!= null and t
== null then
430 v
.error
(self, "Error: continue without value required in this block.")
431 else if n_expr
!= null and t
!= null then
432 v
.check_conform_expr
(n_expr
.as(not null), t
)
438 redef class ABreakExpr
439 redef fun after_typing
(v
)
441 v
.variable_ctx
.unreash
= true
442 var esc
= compute_escapable_block
(v
.escapable_ctx
)
443 if esc
== null then return
445 var bl
= esc
.break_list
446 if n_expr
== null and bl
!= null then
447 v
.error
(self, "Error: break with a value required in this block.")
448 else if n_expr
!= null and bl
== null then
449 v
.error
(self, "Error: break without value required in this block.")
450 else if n_expr
!= null and bl
!= null then
451 # Typing check can only be done later
452 bl
.add
(n_expr
.as(not null))
458 redef class AAbortExpr
459 redef fun after_typing
(v
)
461 v
.variable_ctx
.unreash
= true
467 # The corresponding escapable block
468 readable var _escapable
: nullable EscapableBlock
470 redef fun accept_typing
(v
)
472 var escapable
= new BreakOnlyEscapableBlock(self)
473 _escapable
= escapable
474 v
.escapable_ctx
.push
(escapable
, n_label
)
484 redef fun accept_typing
(v
)
486 var old_var_ctx
= v
.variable_ctx
487 v
.enter_visit
(n_expr
)
488 v
.check_conform_expr
(n_expr
, v
.type_bool
)
490 # Prepare 'then' context
491 v
.use_if_true_variable_ctx
(n_expr
)
494 if n_then
!= null then
495 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
.as(not null))
496 v
.enter_visit
(n_then
)
499 # Remember what appened in the 'then'
500 var then_var_ctx
= v
.variable_ctx
502 # Prepare 'else' context
503 v
.variable_ctx
= old_var_ctx
504 v
.use_if_false_variable_ctx
(n_expr
)
507 if n_else
!= null then
508 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
.as(not null))
509 v
.enter_visit
(n_else
)
512 # Merge 'then' and 'else' contexts
513 old_var_ctx
.merge2
(then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
514 v
.variable_ctx
= old_var_ctx
519 redef class AWhileExpr
520 # The corresponding escapable block
521 readable var _escapable
: nullable EscapableBlock
523 redef fun accept_typing
(v
)
525 var escapable
= new EscapableBlock(self)
526 _escapable
= escapable
527 v
.escapable_ctx
.push
(escapable
, n_label
)
528 var old_var_ctx
= v
.variable_ctx
529 var old_base_var_ctx
= v
.base_variable_ctx
530 v
.base_variable_ctx
= v
.variable_ctx
531 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
534 v
.enter_visit
(n_expr
)
535 v
.check_conform_expr
(n_expr
, v
.type_bool
)
537 # Prepare inside context (assert cond)
538 v
.use_if_true_variable_ctx
(n_expr
)
541 if n_block
!= null then
542 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
543 v
.enter_visit
(n_block
)
546 v
.variable_ctx
= old_var_ctx
547 v
.base_variable_ctx
= old_base_var_ctx
553 redef class ALoopExpr
554 # The corresponding escapable block
555 readable var _escapable
: nullable EscapableBlock
557 redef fun accept_typing
(v
)
559 var escapable
= new EscapableBlock(self)
560 _escapable
= escapable
561 v
.escapable_ctx
.push
(escapable
, n_label
)
562 var old_var_ctx
= v
.variable_ctx
563 var old_base_var_ctx
= v
.base_variable_ctx
564 v
.base_variable_ctx
= v
.variable_ctx
565 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
568 if n_block
!= null then
569 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
570 v
.enter_visit
(n_block
)
573 v
.variable_ctx
= old_var_ctx
574 v
.base_variable_ctx
= old_base_var_ctx
581 var _variable
: nullable AutoVariable
582 redef fun variable
do return _variable
.as(not null)
584 # The corresponding escapable block
585 readable var _escapable
: nullable EscapableBlock
587 redef fun accept_typing
(v
)
589 var escapable
= new EscapableBlock(self)
590 _escapable
= escapable
591 v
.escapable_ctx
.push
(escapable
, n_label
)
593 var old_var_ctx
= v
.variable_ctx
594 var old_base_var_ctx
= v
.base_variable_ctx
595 v
.base_variable_ctx
= v
.variable_ctx
596 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
597 var va
= new AutoVariable(n_id
.to_symbol
, n_id
)
599 v
.variable_ctx
.add
(va
)
602 v
.enter_visit
(n_expr
)
604 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then return
605 var expr_type
= n_expr
.stype
608 var meth_iterator
= v
.get_method
(expr_type
, once
"iterator".to_symbol
)
609 var iter_type
= meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
610 var meth_item
= v
.get_method
(iter_type
, once
("item".to_symbol
))
611 var va_stype
= meth_item
.signature_for
(iter_type
).return_type
.as(not null)
612 if not n_expr
.is_self
then va_stype
= va_stype
.not_for_self
616 if n_block
!= null then v
.enter_visit
(n_block
)
619 v
.variable_ctx
= old_var_ctx
620 v
.base_variable_ctx
= old_base_var_ctx
626 redef class AAssertExpr
627 redef fun accept_typing
(v
)
630 v
.enter_visit
(n_expr
)
631 v
.check_conform_expr
(n_expr
, v
.type_bool
)
633 # Process optional 'else' part
634 if n_else
!= null then
635 var old_var_ctx
= v
.variable_ctx
636 v
.use_if_false_variable_ctx
(n_expr
)
637 v
.enter_visit
(n_else
)
638 v
.variable_ctx
= old_var_ctx
642 v
.use_if_true_variable_ctx
(n_expr
)
647 redef class AVarFormExpr
648 var _variable
: nullable Variable
649 redef fun variable
do return _variable
.as(not null)
653 redef fun its_variable
do return variable
655 redef fun after_typing
(v
)
657 v
.variable_ctx
.check_is_set
(self, variable
)
658 _stype
= v
.variable_ctx
.stype
(variable
)
659 _is_typed
= _stype
!= null
663 redef class AVarAssignExpr
664 redef fun after_typing
(v
)
666 v
.variable_ctx
.mark_is_set
(variable
)
668 # Check the base type
669 var btype
= v
.base_variable_ctx
.stype
(variable
)
670 if not v
.check_expr
(n_value
) then return
671 if btype
!= null and not v
.check_conform_expr
(n_value
, btype
) then return
674 v
.variable_ctx
.stype
(variable
) = n_value
.stype
680 redef class AReassignFormExpr
681 # Compute and check method used through the reassigment operator
682 # On success return the static type of the result of the reassigment operator
683 # Else display an error and return null
684 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
686 if type_lvalue
== null then
689 var name
= n_assign_op
.method_name
690 var lc
= type_lvalue
.local_class
691 if not lc
.has_global_property_by_name
(name
) then
692 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
695 var prop
= lc
.select_method
(name
)
696 prop
.global
.check_visibility
(v
, self, v
.module, false)
697 var psig
= prop
.signature_for
(type_lvalue
)
698 _assign_method
= prop
699 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
700 return psig
.return_type
.not_for_self
703 redef fun assign_method
do return _assign_method
.as(not null)
704 var _assign_method
: nullable MMMethod
707 redef class AVarReassignExpr
708 redef fun after_typing
(v
)
710 v
.variable_ctx
.check_is_set
(self, variable
)
711 v
.variable_ctx
.mark_is_set
(variable
)
712 var t
= v
.variable_ctx
.stype
(variable
)
713 var t2
= do_rvalue_typing
(v
, t
)
714 if t2
== null then return
716 # Check the base type
717 var btype
= v
.base_variable_ctx
.stype
(variable
)
718 if not v
.check_expr
(n_value
) then return
719 if btype
!= null and not v
.check_conform
(n_value
, t2
, btype
) then return
722 v
.variable_ctx
.stype
(variable
) = t2
728 redef class AAssignOp
729 fun method_name
: Symbol is abstract
731 redef class APlusAssignOp
732 redef fun method_name
do return once
"+".to_symbol
734 redef class AMinusAssignOp
735 redef fun method_name
do return once
"-".to_symbol
738 redef class ASelfExpr
739 var _variable
: nullable ParamVariable
740 redef fun variable
do return _variable
.as(not null)
742 redef fun its_variable
do return variable
744 redef fun after_typing
(v
)
746 _variable
= v
.self_var
747 _stype
= v
.variable_ctx
.stype
(variable
)
751 redef fun is_self
do return true
754 redef class AImplicitSelfExpr
755 redef fun is_implicit_self
do return true
758 redef class AIfexprExpr
759 redef fun accept_typing
(v
)
761 var old_var_ctx
= v
.variable_ctx
764 v
.enter_visit
(n_expr
)
765 v
.check_conform_expr
(n_expr
, v
.type_bool
)
767 # Prepare 'then' context
768 v
.use_if_true_variable_ctx
(n_expr
)
771 v
.enter_visit
(n_then
)
773 # Prepare 'else' context
774 v
.variable_ctx
= old_var_ctx
775 v
.use_if_false_variable_ctx
(n_expr
)
778 v
.enter_visit
(n_else
)
780 var stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
781 if stype
== null then return
788 redef class ABoolExpr
789 redef fun after_typing
(v
)
797 redef fun accept_typing
(v
)
799 var old_var_ctx
= v
.variable_ctx
800 var stype
= v
.type_bool
803 # Process left operand
804 v
.enter_visit
(n_expr
)
806 # Prepare right operand context
807 v
.use_if_false_variable_ctx
(n_expr
)
809 # Process right operand
810 v
.enter_visit
(n_expr2
)
811 if n_expr2
.if_false_variable_ctx
!= null then
812 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
814 _if_false_variable_ctx
= v
.variable_ctx
817 v
.variable_ctx
= old_var_ctx
819 v
.check_conform_expr
(n_expr
, stype
)
820 v
.check_conform_expr
(n_expr2
, stype
)
827 redef fun accept_typing
(v
)
829 var old_var_ctx
= v
.variable_ctx
830 var stype
= v
.type_bool
832 # Process left operand
833 v
.enter_visit
(n_expr
)
835 # Prepare right operand context
836 v
.use_if_true_variable_ctx
(n_expr
)
838 # Process right operand
839 v
.enter_visit
(n_expr2
)
840 if n_expr2
.if_true_variable_ctx
!= null then
841 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
843 _if_true_variable_ctx
= v
.variable_ctx
846 v
.variable_ctx
= old_var_ctx
848 v
.check_conform_expr
(n_expr
, stype
)
849 v
.check_conform_expr
(n_expr2
, stype
)
856 redef fun after_typing
(v
)
858 v
.check_conform_expr
(n_expr
, v
.type_bool
)
860 # Invert if_true/if_false information
861 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
862 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
870 redef fun after_typing
(v
)
877 redef class AFloatExpr
878 redef fun after_typing
(v
)
880 _stype
= v
.type_float
885 redef class ACharExpr
886 redef fun after_typing
(v
)
893 redef class AStringFormExpr
894 redef fun after_typing
(v
)
896 _stype
= v
.type_string
901 redef class ASuperstringExpr
902 redef fun atype
do return _atype
.as(not null)
903 var _atype
: nullable MMType
904 redef fun after_typing
(v
)
906 var stype
= v
.type_string
908 var atype
= v
.type_array
(stype
)
914 redef class ANullExpr
915 redef fun after_typing
(v
)
922 redef class AArrayExpr
923 redef fun after_typing
(v
)
925 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
926 if stype
!= null then do_typing
(v
, stype
)
929 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
931 _stype
= v
.type_array
(element_type
)
936 redef class ARangeExpr
937 redef fun after_typing
(v
)
939 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
940 var ntype
= n_expr
.stype
941 var ntype2
= n_expr2
.stype
942 if ntype
< ntype2
then
944 else if not ntype2
< ntype
then
945 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
948 var dtype
= v
.type_discrete
949 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
950 _stype
= v
.type_range
(ntype
)
955 redef class ASuperExpr
956 redef readable var _init_in_superclass
: nullable MMMethod
957 redef fun compute_raw_arguments
do return n_args
.to_a
958 redef fun after_typing
(v
)
960 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
961 if not precs
.is_empty
then
962 v
.local_property
.need_super
= true
963 else if v
.local_property
.global
.is_init
then
964 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
965 for p
in base_precs
do
966 if not p
.global
.is_init
then
967 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
969 precs
.add
(v
.local_class
[p
.global
])
972 if precs
.is_empty
then
973 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
975 else if precs
.length
> 1 then
976 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
979 var p
= base_precs
.first
980 assert p
isa MMMethod
981 _init_in_superclass
= p
982 register_super_init_call
(v
, p
)
983 if n_args
.length
> 0 then
984 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
985 process_signature
(v
, signature
, p
.name
, compute_raw_arguments
)
988 v
.error
(self, "Error: No super method to call for {v.local_property}.")
992 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
993 var stypes
= new Array[MMType]
994 var stype
: nullable MMType = null
996 assert prop
isa MMMethod
997 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
)
999 if stype
== null or stype
< t
then
1004 v
.check_conform
(self, t
, stype
.as(not null))
1008 var p
= v
.local_property
1009 assert p
isa MMSrcMethod
1015 redef class AAttrFormExpr
1016 redef fun prop
do return _prop
.as(not null)
1017 var _prop
: nullable MMAttribute
1019 redef fun attr_type
do return _attr_type
.as(not null)
1020 var _attr_type
: nullable MMType
1022 # Compute the attribute accessed
1023 private fun do_typing
(v
: TypingVisitor)
1025 if not v
.check_expr
(n_expr
) then return
1026 var type_recv
= n_expr
.stype
1027 var name
= n_id
.to_symbol
1028 var lc
= type_recv
.local_class
1029 if not lc
.has_global_property_by_name
(name
) then
1030 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
1033 var prop
= lc
.select_attribute
(name
)
1034 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
1035 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
1038 var at
= prop
.signature_for
(type_recv
).return_type
1039 if not n_expr
.is_self
then at
= at
.not_for_self
1044 redef class AAttrExpr
1045 redef fun after_typing
(v
)
1048 if _prop
== null then return
1054 redef class AAttrAssignExpr
1055 redef fun after_typing
(v
)
1058 if _prop
== null then return
1059 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1064 redef class AAttrReassignExpr
1065 redef fun after_typing
(v
)
1068 if _prop
== null then return
1069 var t
= do_rvalue_typing
(v
, attr_type
)
1070 if t
== null then return
1071 v
.check_conform
(self, t
, n_value
.stype
)
1076 redef class AIssetAttrExpr
1077 redef fun after_typing
(v
)
1080 if _prop
== null then return
1081 if attr_type
.is_nullable
then
1082 v
.error
(self, "Error: isset on a nullable attribute.")
1084 _stype
= v
.type_bool
1089 redef class AAbsAbsSendExpr
1090 # The signature of the called property
1091 redef fun prop_signature
do return _prop_signature
.as(not null)
1092 var _prop_signature
: nullable MMSignature
1094 # Raw arguments used (without vararg transformation)
1095 redef fun raw_arguments
: Array[AExpr]
1097 var res
= _raw_arguments_cache
1101 res
= compute_raw_arguments
1102 if res
== null then res
= new Array[AExpr]
1103 _raw_arguments_cache
= res
1108 var _raw_arguments_cache
: nullable Array[AExpr] = null
1110 fun compute_raw_arguments
: nullable Array[AExpr]
1112 print
"{location} no compute_raw_arguments"
1116 # Check the conformity of a set of arguments `raw_args' to a signature.
1117 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[AExpr]): Bool
1119 var par_vararg
= psig
.vararg_rank
1120 var par_arity
= psig
.arity
1122 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1123 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1124 v
.error
(self, "Error: arity missmatch; prototype is '{name}{psig}'.")
1128 for par_idx
in [0..par_arity
[ do
1130 var par_type
= psig
[par_idx
]
1131 if par_idx
== par_vararg
then
1132 for i
in [0..(raw_arity-par_arity
)] do
1133 a
= raw_args
[arg_idx
]
1134 v
.check_conform_expr
(a
, par_type
)
1135 arg_idx
= arg_idx
+ 1
1138 a
= raw_args
[arg_idx
]
1139 v
.check_conform_expr
(a
, par_type
)
1140 arg_idx
= arg_idx
+ 1
1146 # Check the conformity of a set of defined closures
1147 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[AClosureDef]): nullable MMType
1149 var t
= psig
.return_type
1150 var cs
= psig
.closures
# Declared closures
1153 if not c
.is_optional
then min_arity
+= 1
1156 if cd
!= null then arity
= cd
.length
1157 if cs
.length
> 0 then
1158 if arity
== 0 and min_arity
> 0 then
1159 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1160 else if arity
> cs
.length
or arity
< min_arity
then
1161 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1163 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1164 var break_list
: nullable Array[ABreakExpr] = null
1165 if t
!= null then break_list
= new Array[ABreakExpr]
1167 # The n_label, is any in only set on the last decl
1168 var n_label
= if arity
> 0 then cd
[arity-1
].n_label
else null
1170 # Process each closure definition
1171 for i
in [0..arity
[ do
1173 var cni
= cdi
.n_id
.to_symbol
1174 var csi
= psig
.closure_named
(cni
)
1176 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1177 v
.escapable_ctx
.push
(esc
, n_label
)
1178 cdi
.accept_typing2
(v
, esc
)
1180 else if cs
.length
== 1 then
1181 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closure is !{cs.first.name}.")
1183 var a
= new Array[String]
1187 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closures are {a.join(",")}.")
1191 # Check break type conformity
1192 if break_list
!= null then
1193 t
= v
.check_conform_multiexpr
(t
, break_list
)
1196 else if arity
!= 0 then
1197 v
.error
(self, "Error: {name} does not require blocks.")
1203 redef class AAbsSendExpr
1204 # Compute the called global property
1205 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])
1207 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1208 if prop
== null then return
1209 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1210 if not process_signature
(v
, sig
, prop
.name
, raw_args
) then return
1211 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1212 if rtype
== null and sig
.return_type
!= null then return
1214 _prop_signature
= sig
1215 _return_type
= rtype
1218 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1220 var lc
= type_recv
.local_class
1221 var prop
: nullable MMMethod = null
1222 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1223 if prop
== null and v
.local_property
.global
.is_init
then
1224 var props
= type_recv
.local_class
.super_methods_named
(name
)
1225 if props
.length
> 1 then
1226 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1228 else if props
.length
== 1 then
1229 var p
= type_recv
.local_class
[props
.first
.global
]
1230 assert p
isa MMMethod
1235 if prop
== null then
1236 if is_implicit_self
then
1237 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1239 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1246 # Get the signature for a local property and a receiver
1247 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1249 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1250 var psig
= prop
.signature_for
(type_recv
)
1251 if not recv_is_self
then psig
= psig
.not_for_self
1255 # The invoked method (once computed)
1256 redef fun prop
do return _prop
.as(not null)
1257 var _prop
: nullable MMMethod
1259 # The return type (if any) (once computed)
1260 redef readable var _return_type
: nullable MMType
1263 # A possible call of constructor in a super class
1264 # Could be an explicit call or with the 'super' keyword
1265 redef class ASuperInitCall
1266 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1268 if parent
!= v
.top_block
and self != v
.top_block
then
1269 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1271 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1272 var prev_class
: nullable MMLocalClass = null
1273 var esic
= v
.explicit_super_init_calls
.as(not null)
1274 if not esic
.is_empty
then
1275 prev_class
= esic
.last
.global
.intro
.local_class
1277 var order
= v
.local_class
.cshe
.reverse_linear_extension
1278 if cla
== v
.local_class
then
1279 v
.explicit_other_init_call
= true
1280 else if not order
.has
(cla
) then
1281 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1282 else if cla
== prev_class
then
1283 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1285 var last_is_found
= prev_class
== null
1287 if c
== prev_class
then
1288 last_is_found
= true
1289 else if c
== cla
then
1290 if not last_is_found
then
1291 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1302 redef class ANewExpr
1303 redef fun compute_raw_arguments
do return n_args
.to_a
1304 redef fun after_typing
(v
)
1306 if not n_type
.is_typed
then return
1307 var t
= n_type
.stype
1308 if t
.local_class
.global
.is_abstract
then
1309 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1313 if n_id
== null then
1314 name
= once
"init".to_symbol
1316 name
= n_id
.to_symbol
1319 do_typing
(v
, t
, false, false, name
, raw_arguments
, null)
1320 if _prop
== null then return
1322 if not prop
.global
.is_init
then
1323 v
.error
(self, "Error: {prop} is not a constructor.")
1332 redef class ASendExpr
1333 # Name of the invoked property
1334 fun name
: Symbol is abstract
1336 # Closure definitions
1337 redef fun closure_defs
: nullable Array[AClosureDef] do return null
1339 redef fun after_typing
(v
)
1344 private fun do_all_typing
(v
: TypingVisitor)
1346 if not v
.check_expr
(n_expr
) then return
1347 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1348 if _prop
== null then return
1349 var prop
= _prop
.as(not null)
1351 if prop
.global
.is_init
then
1352 if not v
.local_property
.global
.is_init
then
1353 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1354 else if not n_expr
.is_self
then
1355 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1357 register_super_init_call
(v
, prop
)
1361 _stype
= return_type
1366 redef class ASendReassignExpr
1367 redef fun read_prop
do return _read_prop
.as(not null)
1368 var _read_prop
: nullable MMMethod
1369 redef fun do_all_typing
(v
)
1371 if not v
.check_expr
(n_expr
) then return
1372 var raw_args
= raw_arguments
1373 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1375 if prop
== null then return
1376 if prop
.global
.is_init
then
1377 if not v
.local_property
.global
.is_init
then
1378 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1379 else if not n_expr
.is_self
then
1380 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1383 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1384 if not n_expr
.is_self
then t
= t
.not_for_self
1386 var t2
= do_rvalue_typing
(v
, t
)
1387 if t2
== null then return
1388 v
.check_conform
(self, t2
, n_value
.stype
)
1391 raw_args
= raw_args
.to_a
1392 raw_args
.add
(n_value
)
1394 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1395 if prop
.global
.is_init
then
1396 if not v
.local_property
.global
.is_init
then
1397 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1398 else if not n_expr
.is_self
then
1399 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1407 redef class ABinopExpr
1408 redef fun compute_raw_arguments
do return [n_expr2
]
1411 redef fun name
do return once
"==".to_symbol
1412 redef fun after_typing
(v
)
1415 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1416 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1417 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1418 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1421 if n_expr
.stype
isa MMTypeNone then
1422 try_to_isa
(v
, n_expr2
)
1423 else if n_expr2
.stype
isa MMTypeNone then
1424 try_to_isa
(v
, n_expr
)
1428 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1430 var variable
= n
.its_variable
1431 if variable
!= null then
1432 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1437 redef fun name
do return once
"!=".to_symbol
1438 redef fun after_typing
(v
)
1441 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1442 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1443 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1444 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1447 if n_expr
.stype
isa MMTypeNone then
1448 try_to_isa
(v
, n_expr2
)
1449 else if n_expr2
.stype
isa MMTypeNone then
1450 try_to_isa
(v
, n_expr
)
1454 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1456 var variable
= n
.its_variable
1457 if variable
!= null then
1458 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1463 redef fun name
do return once
"<".to_symbol
1466 redef fun name
do return once
"<=".to_symbol
1469 redef fun name
do return once
">".to_symbol
1472 redef fun name
do return once
">=".to_symbol
1474 redef class APlusExpr
1475 redef fun name
do return once
"+".to_symbol
1477 redef class AMinusExpr
1478 redef fun name
do return once
"-".to_symbol
1480 redef class AStarshipExpr
1481 redef fun name
do return once
"<=>".to_symbol
1483 redef class AStarExpr
1484 redef fun name
do return once
"*".to_symbol
1486 redef class ASlashExpr
1487 redef fun name
do return once
"/".to_symbol
1489 redef class APercentExpr
1490 redef fun name
do return once
"%".to_symbol
1493 redef class AUminusExpr
1494 redef fun name
do return once
"unary -".to_symbol
1495 redef fun compute_raw_arguments
do return null
1498 redef class ACallFormExpr
1499 redef fun after_typing
(v
)
1501 if n_expr
.is_implicit_self
then
1502 var name
= n_id
.to_symbol
1503 var variable
= v
.variable_ctx
[name
]
1504 if variable
!= null then
1506 if variable
isa ClosureVariable then
1507 n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1508 n
._variable
= variable
1510 if not n_args
.is_empty
then
1511 v
.error
(self, "Error: {name} is variable, not a function.")
1514 n
= variable_create
(variable
)
1515 n
._variable
= variable
1526 redef fun closure_defs
1528 if n_closure_defs
.is_empty
then
1531 return n_closure_defs
.to_a
1535 # Create a variable acces corresponding to the call form
1536 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1539 redef class ACallExpr
1540 redef fun variable_create
(variable
)
1542 return new AVarExpr.init_avarexpr
(n_id
)
1545 redef fun name
do return n_id
.to_symbol
1546 redef fun compute_raw_arguments
do return n_args
.to_a
1549 redef class ACallAssignExpr
1550 redef fun variable_create
(variable
)
1552 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1555 redef fun name
do return (n_id
.text
+ "=").to_symbol
1556 redef fun compute_raw_arguments
do
1557 var res
= n_args
.to_a
1563 redef class ACallReassignExpr
1564 redef fun variable_create
(variable
)
1566 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1569 redef fun name
do return n_id
.to_symbol
1570 redef fun compute_raw_arguments
do return n_args
.to_a
1573 redef class ABraExpr
1574 redef fun name
do return once
"[]".to_symbol
1575 redef fun compute_raw_arguments
do return n_args
.to_a
1576 redef fun closure_defs
1578 if n_closure_defs
.is_empty
then
1581 return n_closure_defs
.to_a
1586 redef class ABraAssignExpr
1587 redef fun name
do return once
"[]=".to_symbol
1588 redef fun compute_raw_arguments
do
1589 var res
= n_args
.to_a
1595 redef class ABraReassignExpr
1596 redef fun name
do return once
"[]".to_symbol
1597 redef fun compute_raw_arguments
do return n_args
.to_a
1600 redef class AInitExpr
1601 redef fun name
do return once
"init".to_symbol
1602 redef fun compute_raw_arguments
do return n_args
.to_a
1605 redef class AClosureCallExpr
1606 var _variable
: nullable ClosureVariable
1607 redef fun variable
do return _variable
.as(not null)
1608 redef fun compute_raw_arguments
do return n_args
.to_a
1610 redef fun after_typing
(v
)
1613 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1614 var sig
= va
.closure
.signature
1615 var s
= process_signature
(v
, sig
, n_id
.to_symbol
, compute_raw_arguments
)
1616 if not n_closure_defs
.is_empty
then
1617 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1619 if not s
then return
1620 _prop_signature
= sig
1621 _stype
= sig
.return_type
1626 redef class AClosureId
1627 fun to_symbol
: Symbol is abstract
1629 redef class ASimpleClosureId
1630 redef fun to_symbol
: Symbol do return n_id
.to_symbol
1632 redef class ABreakClosureId
1633 redef fun to_symbol
: Symbol do return n_kwbreak
.to_symbol
1636 redef class AClosureDef
1637 var _closure
: nullable MMClosure
1638 redef fun closure
do return _closure
.as(not null)
1640 # The corresponding escapable object
1641 readable var _escapable
: nullable EscapableBlock
1643 var _accept_typing2
: Bool = false
1644 redef fun accept_typing
(v
)
1646 # Typing is deferred, wait accept_typing2(v)
1647 if _accept_typing2
then super
1650 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure)
1654 var sig
= esc
.closure
.signature
1655 if sig
.arity
!= n_ids
.length
then
1656 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_ids.length} found.")
1660 _closure
= esc
.closure
1662 var old_var_ctx
= v
.variable_ctx
1663 var old_base_var_ctx
= v
.base_variable_ctx
1664 v
.base_variable_ctx
= v
.variable_ctx
1665 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1666 variables
= new Array[AutoVariable]
1667 for i
in [0..n_ids
.length
[ do
1668 var va
= new AutoVariable(n_ids
[i
].to_symbol
, n_ids
[i
])
1671 v
.variable_ctx
.add
(va
)
1674 _accept_typing2
= true
1677 if v
.variable_ctx
.unreash
== false then
1678 if closure
.signature
.return_type
!= null then
1679 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1680 else if closure
.is_break
then
1681 v
.error
(self, "Control error: Reached end of break block (a 'break' was expected).")
1684 v
.variable_ctx
= old_var_ctx
1685 v
.base_variable_ctx
= old_base_var_ctx
1689 class ATypeCheckExpr
1691 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: AExpr, n_type
: AType)
1693 if not v
.check_expr
(n_expr
) then return
1694 if not n_type
.is_typed
then return
1695 var etype
= n_expr
.stype
1696 var ttype
= n_type
.stype
1697 if etype
== ttype
then
1698 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1699 else if etype
< ttype
then
1700 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1701 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1702 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1703 # No warning in this case since with
1704 # type T: nullable A
1706 # 'x.as(not null)' != 'x.as(T)'
1707 # 'x != null' != 'x isa T'
1708 else if self isa AIsaExpr then
1709 v
.warning
(self, "Warning: Prefer '!= null'.")
1711 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1717 redef class AIsaExpr
1718 special ATypeCheckExpr
1719 redef fun after_typing
(v
)
1721 check_expr_cast
(v
, n_expr
, n_type
)
1722 if not n_type
.is_typed
then return
1723 var variable
= n_expr
.its_variable
1724 if variable
!= null then
1725 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1727 _stype
= v
.type_bool
1732 redef class AAsCastExpr
1733 special ATypeCheckExpr
1734 redef fun after_typing
(v
)
1736 check_expr_cast
(v
, n_expr
, n_type
)
1737 if not n_type
.is_typed
then return
1738 _stype
= n_type
.stype
1739 _is_typed
= _stype
!= null
1743 redef class AAsNotnullExpr
1744 redef fun after_typing
(v
)
1746 if not v
.check_expr
(n_expr
) then return
1747 var t
= n_expr
.stype
1748 if t
isa MMTypeNone then
1749 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1751 else if not t
.is_nullable
then
1752 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1754 _stype
= n_expr
.stype
.as_notnull
1759 redef class AProxyExpr
1760 redef fun after_typing
(v
)
1762 if not n_expr
.is_typed
then return
1764 if n_expr
.is_statement
then return
1765 _stype
= n_expr
.stype
1769 redef class AOnceExpr
1770 redef fun accept_typing
(v
)
1772 if v
.once_count
> 0 then
1773 v
.warning
(self, "Useless once in a once expression.")
1775 v
.once_count
= v
.once_count
+ 1
1779 v
.once_count
= v
.once_count
- 1