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}.")
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 AClassdef
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
163 redef fun self_var
do return _self_var
.as(not null)
164 var _self_var
: nullable ParamVariable
167 redef class AAttrPropdef
168 redef fun accept_typing
(v
)
170 var old_var_ctx
= v
.variable_ctx
171 v
.variable_ctx
= old_var_ctx
.sub
(self)
172 _self_var
= v
.self_var
174 if n_expr
!= null then
175 v
.check_conform_expr
(n_expr
.as(not null), prop
.signature
.return_type
.as(not null))
177 v
.variable_ctx
= old_var_ctx
181 redef class AMethPropdef
182 redef fun accept_typing
(v
)
184 var old_var_ctx
= v
.variable_ctx
185 v
.variable_ctx
= old_var_ctx
.sub
(self)
186 _self_var
= v
.self_var
188 v
.variable_ctx
= old_var_ctx
192 redef class AConcreteMethPropdef
193 redef fun after_typing
(v
)
196 if v
.variable_ctx
.unreash
== false and method
.signature
.return_type
!= null then
197 v
.error
(self, "Control error: Reached end of function (a 'return' with a value was expected).")
202 redef class AConcreteInitPropdef
203 redef fun accept_typing
(v
)
205 v
.top_block
= n_block
206 v
.explicit_super_init_calls
= explicit_super_init_calls
207 v
.explicit_other_init_call
= false
211 redef fun after_typing
(v
)
214 if v
.explicit_other_init_call
or method
.global
.intro
!= method
then
218 var l
= explicit_super_init_calls
.length
219 var cur_m
: nullable MMMethod = null
220 var cur_c
: nullable MMLocalClass = null
222 cur_m
= explicit_super_init_calls
[i
]
223 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
226 while j
< v
.local_class
.cshe
.direct_greaters
.length
do
227 var c
= v
.local_class
.cshe
.direct_greaters
[j
]
228 if c
.global
.is_interface
or c
.global
.is_universal
or c
.global
.is_mixin
then
230 else if cur_c
!= null and (c
.cshe
<= cur_c
or cur_c
.global
.is_mixin
) then
231 if c
== cur_c
then j
+= 1
232 super_init_calls
.add
(cur_m
.as(not null))
235 cur_m
= explicit_super_init_calls
[i
]
236 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
242 var p
= v
.get_default_constructor_for
(self, c
, method
)
244 super_init_calls
.add
(p
)
254 redef fun after_typing
(v
)
256 v
.variable_ctx
.add
(variable
)
260 redef class AClosureDecl
261 # The corresponding escapable object
262 readable var _escapable
: nullable EscapableBlock
264 redef fun accept_typing
(v
)
266 # Register the closure for ClosureCallExpr
267 v
.variable_ctx
.add
(variable
)
269 var old_var_ctx
= v
.variable_ctx
270 var old_base_var_ctx
= v
.base_variable_ctx
271 v
.base_variable_ctx
= v
.variable_ctx
272 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
274 var blist
: nullable Array[AExpr] = null
275 var t
= v
.local_property
.signature
.return_type
276 if t
!= null then blist
= new Array[AExpr]
277 var escapable
= new EscapableClosure(self, variable
.closure
, blist
)
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
and escapable
.break_list
!= null then
288 v
.error
(self, "Control error: Reached end of break block (a 'break' with a value was expected).")
292 if blist
!= null then for x
in blist
do
293 v
.check_conform_expr
(x
, t
)
296 old_var_ctx
.merge
(v
.variable_ctx
)
297 v
.variable_ctx
= old_var_ctx
298 v
.base_variable_ctx
= old_base_var_ctx
304 redef fun stype
: MMType do return _stype
.as(not null)
305 redef fun is_typed
: Bool do return _stype
!= null
306 var _stype
: nullable MMType
308 redef fun after_typing
(v
)
310 _stype
= get_stype
(v
)
315 redef readable var _is_typed
: Bool = false
316 redef fun is_statement
: Bool do return _stype
== null
320 print
"{location}: not is_typed"
324 print
"{location}: is_statement"
327 return _stype
.as(not null)
329 var _stype
: nullable MMType
331 redef fun after_typing
(v
)
333 # Default behavior is to be happy
337 # Is the expression the implicit receiver
338 fun is_implicit_self
: Bool do return false
340 # Is the expression the current receiver (implicit or explicit)
341 fun is_self
: Bool do return false
343 # The variable accessed is any
344 fun its_variable
: nullable Variable do return null
346 # The variable type information if current boolean expression is true
347 readable private var _if_true_variable_ctx
: nullable VariableContext
349 # The variable type information if current boolean expression is false
350 readable private var _if_false_variable_ctx
: nullable VariableContext
353 redef class AVardeclExpr
354 var _variable
: nullable VarVariable
355 redef fun variable
do return _variable
.as(not null)
357 redef fun after_typing
(v
)
359 var va
= new VarVariable(n_id
.to_symbol
, n_id
)
361 v
.variable_ctx
.add
(va
)
363 if ne
!= null then v
.variable_ctx
.mark_is_set
(va
)
365 if n_type
!= null then
366 if not n_type
.is_typed
then return
367 va
.stype
= n_type
.stype
369 v
.check_conform_expr
(ne
, va
.stype
)
371 else if ne
!= null then
372 if not v
.check_expr
(ne
) then return
375 va
.stype
= v
.type_object
.as_nullable
381 redef class ABlockExpr
382 redef fun accept_typing
(v
)
384 var old_var_ctx
= v
.variable_ctx
385 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
388 if v
.variable_ctx
.unreash
and not v
.variable_ctx
.already_unreash
then
389 v
.variable_ctx
.already_unreash
= true
390 v
.warning
(e
, "Warning: unreachable statement.")
395 old_var_ctx
.merge
(v
.variable_ctx
)
396 v
.variable_ctx
= old_var_ctx
401 redef class AReturnExpr
402 redef fun after_typing
(v
)
404 v
.variable_ctx
.unreash
= true
405 var t
= v
.local_property
.signature
.return_type
407 if e
== null and t
!= null then
408 v
.error
(self, "Error: Return without value in a function.")
409 else if e
!= null and t
== null then
410 v
.error
(self, "Error: Return with value in a procedure.")
411 else if e
!= null and t
!= null then
412 v
.check_conform_expr
(e
, t
)
418 redef class AContinueExpr
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 if esc
.is_break_block
then
426 v
.error
(self, "Error: cannot 'continue', only 'break'.")
430 var t
= esc
.continue_stype
431 if n_expr
== null and t
!= null then
432 v
.error
(self, "Error: continue with a value required in this block.")
433 else if n_expr
!= null and t
== null then
434 v
.error
(self, "Error: continue without value required in this block.")
435 else if n_expr
!= null and t
!= null then
436 v
.check_conform_expr
(n_expr
.as(not null), t
)
442 redef class ABreakExpr
443 redef fun after_typing
(v
)
445 v
.variable_ctx
.unreash
= true
446 var esc
= compute_escapable_block
(v
.escapable_ctx
)
447 if esc
== null then return
449 var bl
= esc
.break_list
450 if n_expr
== null and bl
!= null then
451 v
.error
(self, "Error: break with a value required in this block.")
452 else if n_expr
!= null and bl
== null then
453 v
.error
(self, "Error: break without value required in this block.")
454 else if n_expr
!= null and bl
!= null then
455 # Typing check can only be done later
456 bl
.add
(n_expr
.as(not null))
462 redef class AAbortExpr
463 redef fun after_typing
(v
)
465 v
.variable_ctx
.unreash
= true
471 # The corresponding escapable block
472 readable var _escapable
: nullable EscapableBlock
474 redef fun accept_typing
(v
)
476 var escapable
= new BreakOnlyEscapableBlock(self)
477 _escapable
= escapable
478 v
.escapable_ctx
.push
(escapable
, n_label
)
488 redef fun accept_typing
(v
)
490 var old_var_ctx
= v
.variable_ctx
491 v
.enter_visit
(n_expr
)
492 v
.check_conform_expr
(n_expr
, v
.type_bool
)
494 # Prepare 'then' context
495 v
.use_if_true_variable_ctx
(n_expr
)
498 if n_then
!= null then
499 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
.as(not null))
500 v
.enter_visit
(n_then
)
503 # Remember what appened in the 'then'
504 var then_var_ctx
= v
.variable_ctx
506 # Prepare 'else' context
507 v
.variable_ctx
= old_var_ctx
508 v
.use_if_false_variable_ctx
(n_expr
)
511 if n_else
!= null then
512 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
.as(not null))
513 v
.enter_visit
(n_else
)
516 # Merge 'then' and 'else' contexts
517 old_var_ctx
.merge2
(then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
518 v
.variable_ctx
= old_var_ctx
523 redef class AWhileExpr
524 # The corresponding escapable block
525 readable var _escapable
: nullable EscapableBlock
527 redef fun accept_typing
(v
)
529 var escapable
= new EscapableBlock(self)
530 _escapable
= escapable
531 v
.escapable_ctx
.push
(escapable
, n_label
)
532 var old_var_ctx
= v
.variable_ctx
533 var old_base_var_ctx
= v
.base_variable_ctx
534 v
.base_variable_ctx
= v
.variable_ctx
535 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
538 v
.enter_visit
(n_expr
)
539 v
.check_conform_expr
(n_expr
, v
.type_bool
)
541 if n_expr
isa ATrueExpr then
542 v
.warning
(self, "Warning: use 'loop' instead of 'while true do'.")
545 # Prepare inside context (assert cond)
546 v
.use_if_true_variable_ctx
(n_expr
)
549 if n_block
!= null then
550 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
551 v
.enter_visit
(n_block
)
554 v
.variable_ctx
= old_var_ctx
555 v
.base_variable_ctx
= old_base_var_ctx
561 redef class ALoopExpr
562 # The corresponding escapable block
563 readable var _escapable
: nullable EscapableBlock
565 redef fun accept_typing
(v
)
567 var escapable
= new EscapableBlock(self)
568 _escapable
= escapable
569 v
.escapable_ctx
.push
(escapable
, n_label
)
570 var old_var_ctx
= v
.variable_ctx
571 var old_base_var_ctx
= v
.base_variable_ctx
572 v
.base_variable_ctx
= v
.variable_ctx
573 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
576 if n_block
!= null then
577 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
578 v
.enter_visit
(n_block
)
581 v
.variable_ctx
= old_var_ctx
582 v
.base_variable_ctx
= old_base_var_ctx
589 var _variable
: nullable AutoVariable
590 redef fun variable
do return _variable
.as(not null)
592 # The corresponding escapable block
593 readable var _escapable
: nullable EscapableBlock
595 redef fun accept_typing
(v
)
597 var escapable
= new EscapableBlock(self)
598 _escapable
= escapable
599 v
.escapable_ctx
.push
(escapable
, n_label
)
601 var old_var_ctx
= v
.variable_ctx
602 var old_base_var_ctx
= v
.base_variable_ctx
603 v
.base_variable_ctx
= v
.variable_ctx
604 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
605 var va
= new AutoVariable(n_id
.to_symbol
, n_id
)
607 v
.variable_ctx
.add
(va
)
610 v
.enter_visit
(n_expr
)
612 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then return
613 var expr_type
= n_expr
.stype
616 var meth_iterator
= v
.get_method
(expr_type
, once
"iterator".to_symbol
)
617 var iter_type
= meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
618 var meth_item
= v
.get_method
(iter_type
, once
("item".to_symbol
))
619 var va_stype
= meth_item
.signature_for
(iter_type
).return_type
.as(not null)
620 if not n_expr
.is_self
then va_stype
= va_stype
.not_for_self
624 if n_block
!= null then v
.enter_visit
(n_block
)
627 v
.variable_ctx
= old_var_ctx
628 v
.base_variable_ctx
= old_base_var_ctx
634 redef class AAssertExpr
635 redef fun accept_typing
(v
)
638 v
.enter_visit
(n_expr
)
639 v
.check_conform_expr
(n_expr
, v
.type_bool
)
641 # Process optional 'else' part
642 if n_else
!= null then
643 var old_var_ctx
= v
.variable_ctx
644 v
.use_if_false_variable_ctx
(n_expr
)
645 v
.enter_visit
(n_else
)
646 v
.variable_ctx
= old_var_ctx
650 v
.use_if_true_variable_ctx
(n_expr
)
655 redef class AVarFormExpr
656 var _variable
: nullable Variable
657 redef fun variable
do return _variable
.as(not null)
661 redef fun its_variable
do return variable
663 redef fun after_typing
(v
)
665 v
.variable_ctx
.check_is_set
(self, variable
)
666 _stype
= v
.variable_ctx
.stype
(variable
)
667 _is_typed
= _stype
!= null
671 redef class AVarAssignExpr
672 redef fun after_typing
(v
)
674 v
.variable_ctx
.mark_is_set
(variable
)
676 # Check the base type
677 var btype
= v
.base_variable_ctx
.stype
(variable
)
678 if not v
.check_expr
(n_value
) then return
679 if btype
!= null and not v
.check_conform_expr
(n_value
, btype
) then return
682 v
.variable_ctx
.stype
(variable
) = n_value
.stype
688 redef class AReassignFormExpr
689 # Compute and check method used through the reassigment operator
690 # On success return the static type of the result of the reassigment operator
691 # Else display an error and return null
692 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
694 if type_lvalue
== null then
697 var name
= n_assign_op
.method_name
698 var lc
= type_lvalue
.local_class
699 if not lc
.has_global_property_by_name
(name
) then
700 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
703 var prop
= lc
.select_method
(name
)
704 prop
.global
.check_visibility
(v
, self, v
.module, false)
705 var psig
= prop
.signature_for
(type_lvalue
)
706 _assign_method
= prop
707 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
708 return psig
.return_type
.not_for_self
711 redef fun assign_method
do return _assign_method
.as(not null)
712 var _assign_method
: nullable MMMethod
715 redef class AVarReassignExpr
716 redef fun after_typing
(v
)
718 v
.variable_ctx
.check_is_set
(self, variable
)
719 v
.variable_ctx
.mark_is_set
(variable
)
720 var t
= v
.variable_ctx
.stype
(variable
)
721 var t2
= do_rvalue_typing
(v
, t
)
722 if t2
== null then return
724 # Check the base type
725 var btype
= v
.base_variable_ctx
.stype
(variable
)
726 if not v
.check_expr
(n_value
) then return
727 if btype
!= null and not v
.check_conform
(n_value
, t2
, btype
) then return
730 v
.variable_ctx
.stype
(variable
) = t2
736 redef class AAssignOp
737 fun method_name
: Symbol is abstract
739 redef class APlusAssignOp
740 redef fun method_name
do return once
"+".to_symbol
742 redef class AMinusAssignOp
743 redef fun method_name
do return once
"-".to_symbol
746 redef class ASelfExpr
747 var _variable
: nullable ParamVariable
748 redef fun variable
do return _variable
.as(not null)
750 redef fun its_variable
do return variable
752 redef fun after_typing
(v
)
754 _variable
= v
.self_var
755 _stype
= v
.variable_ctx
.stype
(variable
)
759 redef fun is_self
do return true
762 redef class AImplicitSelfExpr
763 redef fun is_implicit_self
do return true
766 redef class AIfexprExpr
767 redef fun accept_typing
(v
)
769 var old_var_ctx
= v
.variable_ctx
772 v
.enter_visit
(n_expr
)
773 v
.check_conform_expr
(n_expr
, v
.type_bool
)
775 # Prepare 'then' context
776 v
.use_if_true_variable_ctx
(n_expr
)
779 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
)
780 v
.enter_visit
(n_then
)
782 # Remember what appened in the 'then'
783 var then_var_ctx
= v
.variable_ctx
785 # Prepare 'else' context
786 v
.variable_ctx
= old_var_ctx
787 v
.use_if_false_variable_ctx
(n_expr
)
790 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
)
791 v
.enter_visit
(n_else
)
793 # Merge 'then' and 'else' contexts
794 old_var_ctx
.merge2
(then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
795 v
.variable_ctx
= old_var_ctx
797 var stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
798 if stype
== null then return
805 redef class ABoolExpr
806 redef fun after_typing
(v
)
814 redef fun accept_typing
(v
)
816 var old_var_ctx
= v
.variable_ctx
817 var stype
= v
.type_bool
820 # Process left operand
821 v
.enter_visit
(n_expr
)
823 # Prepare right operand context
824 v
.use_if_false_variable_ctx
(n_expr
)
826 # Process right operand
827 v
.enter_visit
(n_expr2
)
828 if n_expr2
.if_false_variable_ctx
!= null then
829 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
831 _if_false_variable_ctx
= v
.variable_ctx
834 v
.variable_ctx
= old_var_ctx
836 v
.check_conform_expr
(n_expr
, stype
)
837 v
.check_conform_expr
(n_expr2
, stype
)
844 redef fun accept_typing
(v
)
846 var old_var_ctx
= v
.variable_ctx
847 var stype
= v
.type_bool
849 # Process left operand
850 v
.enter_visit
(n_expr
)
852 # Prepare right operand context
853 v
.use_if_true_variable_ctx
(n_expr
)
855 # Process right operand
856 v
.enter_visit
(n_expr2
)
857 if n_expr2
.if_true_variable_ctx
!= null then
858 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
860 _if_true_variable_ctx
= v
.variable_ctx
863 v
.variable_ctx
= old_var_ctx
865 v
.check_conform_expr
(n_expr
, stype
)
866 v
.check_conform_expr
(n_expr2
, stype
)
873 redef fun after_typing
(v
)
875 v
.check_conform_expr
(n_expr
, v
.type_bool
)
877 # Invert if_true/if_false information
878 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
879 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
887 redef fun after_typing
(v
)
894 redef class AFloatExpr
895 redef fun after_typing
(v
)
897 _stype
= v
.type_float
902 redef class ACharExpr
903 redef fun after_typing
(v
)
910 redef class AStringFormExpr
911 redef fun after_typing
(v
)
913 _stype
= v
.type_string
918 redef class ASuperstringExpr
919 redef fun atype
do return _atype
.as(not null)
920 var _atype
: nullable MMType
921 redef fun after_typing
(v
)
923 var stype
= v
.type_string
925 var atype
= v
.type_array
(stype
)
931 redef class ANullExpr
932 redef fun after_typing
(v
)
939 redef class AArrayExpr
940 redef fun after_typing
(v
)
942 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
943 if stype
!= null then do_typing
(v
, stype
)
946 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
948 _stype
= v
.type_array
(element_type
)
953 redef class ARangeExpr
954 redef fun after_typing
(v
)
956 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
957 var ntype
= n_expr
.stype
958 var ntype2
= n_expr2
.stype
959 if ntype
< ntype2
then
961 else if not ntype2
< ntype
then
962 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
965 var dtype
= v
.type_discrete
966 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
967 _stype
= v
.type_range
(ntype
)
972 redef class ASuperExpr
973 redef readable var _init_in_superclass
: nullable MMMethod
974 redef fun compute_raw_arguments
do return n_args
.to_a
975 redef fun after_typing
(v
)
977 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
978 if not precs
.is_empty
then
979 v
.local_property
.need_super
= true
980 else if v
.local_property
.global
.is_init
then
981 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
982 for p
in base_precs
do
983 if not p
.global
.is_init
then
984 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
986 precs
.add
(v
.local_class
[p
.global
])
989 if precs
.is_empty
then
990 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
992 else if precs
.length
> 1 then
993 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
996 var p
= base_precs
.first
997 assert p
isa MMMethod
998 _init_in_superclass
= p
999 register_super_init_call
(v
, p
)
1000 if n_args
.length
> 0 then
1001 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
1002 process_signature
(v
, signature
, p
.name
, compute_raw_arguments
)
1005 v
.error
(self, "Error: No super method to call for {v.local_property}.")
1009 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
1010 var stypes
= new Array[MMType]
1011 var stype
: nullable MMType = null
1012 for prop
in precs
do
1013 assert prop
isa MMMethod
1014 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
)
1016 if stype
== null or stype
< t
then
1021 v
.check_conform
(self, t
, stype
.as(not null))
1025 var p
= v
.local_property
1026 assert p
isa MMSrcMethod
1032 redef class AAttrFormExpr
1033 redef fun prop
do return _prop
.as(not null)
1034 var _prop
: nullable MMAttribute
1036 redef fun attr_type
do return _attr_type
.as(not null)
1037 var _attr_type
: nullable MMType
1039 # Compute the attribute accessed
1040 private fun do_typing
(v
: TypingVisitor)
1042 if not v
.check_expr
(n_expr
) then return
1043 var type_recv
= n_expr
.stype
1044 var name
= n_id
.to_symbol
1045 var lc
= type_recv
.local_class
1046 if not lc
.has_global_property_by_name
(name
) then
1047 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
1050 var prop
= lc
.select_attribute
(name
)
1051 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
1052 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
1055 var at
= prop
.signature_for
(type_recv
).return_type
1056 if not n_expr
.is_self
then at
= at
.not_for_self
1061 redef class AAttrExpr
1062 redef fun after_typing
(v
)
1065 if _prop
== null then return
1071 redef class AAttrAssignExpr
1072 redef fun after_typing
(v
)
1075 if _prop
== null then return
1076 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1081 redef class AAttrReassignExpr
1082 redef fun after_typing
(v
)
1085 if _prop
== null then return
1086 var t
= do_rvalue_typing
(v
, attr_type
)
1087 if t
== null then return
1088 v
.check_conform
(self, t
, n_value
.stype
)
1093 redef class AIssetAttrExpr
1094 redef fun after_typing
(v
)
1097 if _prop
== null then return
1098 if attr_type
.is_nullable
then
1099 v
.error
(self, "Error: isset on a nullable attribute.")
1101 _stype
= v
.type_bool
1106 redef class AAbsAbsSendExpr
1107 # The signature of the called property
1108 redef fun prop_signature
do return _prop_signature
.as(not null)
1109 var _prop_signature
: nullable MMSignature
1111 # Raw arguments used (without vararg transformation)
1112 redef fun raw_arguments
: Array[AExpr]
1114 var res
= _raw_arguments_cache
1118 res
= compute_raw_arguments
1119 if res
== null then res
= new Array[AExpr]
1120 _raw_arguments_cache
= res
1125 var _raw_arguments_cache
: nullable Array[AExpr] = null
1127 fun compute_raw_arguments
: nullable Array[AExpr]
1129 print
"{location} no compute_raw_arguments"
1133 # Check the conformity of a set of arguments `raw_args' to a signature.
1134 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[AExpr]): Bool
1136 var par_vararg
= psig
.vararg_rank
1137 var par_arity
= psig
.arity
1139 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1140 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1141 v
.error
(self, "Error: arity missmatch; prototype is '{name}{psig}'.")
1145 for par_idx
in [0..par_arity
[ do
1147 var par_type
= psig
[par_idx
]
1148 if par_idx
== par_vararg
then
1149 for i
in [0..(raw_arity-par_arity
)] do
1150 a
= raw_args
[arg_idx
]
1151 v
.check_conform_expr
(a
, par_type
)
1152 arg_idx
= arg_idx
+ 1
1155 a
= raw_args
[arg_idx
]
1156 v
.check_conform_expr
(a
, par_type
)
1157 arg_idx
= arg_idx
+ 1
1163 # Check the conformity of a set of defined closures
1164 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[AClosureDef]): nullable MMType
1166 var t
= psig
.return_type
1167 var cs
= psig
.closures
# Declared closures
1170 if not c
.is_optional
then min_arity
+= 1
1173 if cd
!= null then arity
= cd
.length
1174 if cs
.length
> 0 then
1175 if arity
== 0 and min_arity
> 0 then
1176 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1177 else if arity
> cs
.length
or arity
< min_arity
then
1178 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1180 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1181 var break_list
: nullable Array[ABreakExpr] = null
1182 if t
!= null then break_list
= new Array[ABreakExpr]
1184 # The n_label, is any in only set on the last decl
1185 var n_label
= if arity
> 0 then cd
[arity-1
].n_label
else null
1187 # Process each closure definition
1188 for i
in [0..arity
[ do
1190 var cni
= cdi
.n_id
.to_symbol
1191 var csi
= psig
.closure_named
(cni
)
1193 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1194 v
.escapable_ctx
.push
(esc
, n_label
)
1195 cdi
.accept_typing2
(v
, esc
)
1197 else if cs
.length
== 1 then
1198 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closure is !{cs.first.name}.")
1200 var a
= new Array[String]
1204 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closures are {a.join(",")}.")
1208 # Check break type conformity
1209 if break_list
!= null then
1210 t
= v
.check_conform_multiexpr
(t
, break_list
)
1213 else if arity
!= 0 then
1214 v
.error
(self, "Error: {name} does not require blocks.")
1220 redef class AAbsSendExpr
1221 # Compute the called global property
1222 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])
1224 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1225 if prop
== null then return
1226 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1227 if not process_signature
(v
, sig
, prop
.name
, raw_args
) then return
1228 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1229 if rtype
== null and sig
.return_type
!= null then return
1231 _prop_signature
= sig
1232 _return_type
= rtype
1235 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1237 var lc
= type_recv
.local_class
1238 var prop
: nullable MMMethod = null
1239 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1240 if prop
== null and v
.local_property
.global
.is_init
then
1241 var props
= type_recv
.local_class
.super_methods_named
(name
)
1242 if props
.length
> 1 then
1243 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1245 else if props
.length
== 1 then
1246 var p
= type_recv
.local_class
[props
.first
.global
]
1247 assert p
isa MMMethod
1252 if prop
== null then
1253 if is_implicit_self
then
1254 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1256 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1263 # Get the signature for a local property and a receiver
1264 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1266 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1267 var psig
= prop
.signature_for
(type_recv
)
1268 if not recv_is_self
then psig
= psig
.not_for_self
1272 # The invoked method (once computed)
1273 redef fun prop
do return _prop
.as(not null)
1274 var _prop
: nullable MMMethod
1276 # The return type (if any) (once computed)
1277 redef readable var _return_type
: nullable MMType
1280 # A possible call of constructor in a super class
1281 # Could be an explicit call or with the 'super' keyword
1282 redef class ASuperInitCall
1283 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1285 if parent
!= v
.top_block
and self != v
.top_block
then
1286 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1288 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1289 var prev_class
: nullable MMLocalClass = null
1290 var esic
= v
.explicit_super_init_calls
.as(not null)
1291 if not esic
.is_empty
then
1292 prev_class
= esic
.last
.global
.intro
.local_class
1294 var order
= v
.local_class
.cshe
.reverse_linear_extension
1295 if cla
== v
.local_class
then
1296 v
.explicit_other_init_call
= true
1297 else if not order
.has
(cla
) then
1298 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1299 else if cla
== prev_class
then
1300 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1302 var last_is_found
= prev_class
== null
1304 if c
== prev_class
then
1305 last_is_found
= true
1306 else if c
== cla
then
1307 if not last_is_found
then
1308 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1319 redef class ANewExpr
1320 redef fun compute_raw_arguments
do return n_args
.to_a
1321 redef fun after_typing
(v
)
1323 if not n_type
.is_typed
then return
1324 var t
= n_type
.stype
1325 if t
.local_class
.global
.is_abstract
then
1326 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1330 if n_id
== null then
1331 name
= once
"init".to_symbol
1333 name
= n_id
.to_symbol
1336 do_typing
(v
, t
, false, false, name
, raw_arguments
, null)
1337 if _prop
== null then return
1339 if not prop
.global
.is_init
then
1340 v
.error
(self, "Error: {prop} is not a constructor.")
1349 redef class ASendExpr
1350 # Name of the invoked property
1351 fun name
: Symbol is abstract
1353 # Closure definitions
1354 redef fun closure_defs
: nullable Array[AClosureDef] do return null
1356 redef fun after_typing
(v
)
1361 private fun do_all_typing
(v
: TypingVisitor)
1363 if not v
.check_expr
(n_expr
) then return
1364 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1365 if _prop
== null then return
1366 var prop
= _prop
.as(not null)
1368 if prop
.global
.is_init
then
1369 if not v
.local_property
.global
.is_init
then
1370 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1371 else if not n_expr
.is_self
then
1372 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1374 register_super_init_call
(v
, prop
)
1378 _stype
= return_type
1383 redef class ASendReassignExpr
1384 redef fun read_prop
do return _read_prop
.as(not null)
1385 var _read_prop
: nullable MMMethod
1386 redef fun do_all_typing
(v
)
1388 if not v
.check_expr
(n_expr
) then return
1389 var raw_args
= raw_arguments
1390 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1392 if prop
== null then return
1393 if prop
.global
.is_init
then
1394 if not v
.local_property
.global
.is_init
then
1395 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1396 else if not n_expr
.is_self
then
1397 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1400 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1401 if not n_expr
.is_self
then t
= t
.not_for_self
1403 var t2
= do_rvalue_typing
(v
, t
)
1404 if t2
== null then return
1405 v
.check_conform
(self, t2
, n_value
.stype
)
1408 raw_args
= raw_args
.to_a
1409 raw_args
.add
(n_value
)
1411 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1412 if prop
.global
.is_init
then
1413 if not v
.local_property
.global
.is_init
then
1414 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1415 else if not n_expr
.is_self
then
1416 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1424 redef class ABinopExpr
1425 redef fun compute_raw_arguments
do return [n_expr2
]
1428 redef fun name
do return once
"==".to_symbol
1429 redef fun after_typing
(v
)
1432 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1433 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1434 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1435 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1438 if n_expr
.stype
isa MMTypeNone then
1439 try_to_isa
(v
, n_expr2
)
1440 else if n_expr2
.stype
isa MMTypeNone then
1441 try_to_isa
(v
, n_expr
)
1445 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1447 var variable
= n
.its_variable
1448 if variable
!= null then
1449 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1454 redef fun name
do return once
"!=".to_symbol
1455 redef fun after_typing
(v
)
1458 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1459 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1460 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1461 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1464 if n_expr
.stype
isa MMTypeNone then
1465 try_to_isa
(v
, n_expr2
)
1466 else if n_expr2
.stype
isa MMTypeNone then
1467 try_to_isa
(v
, n_expr
)
1471 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1473 var variable
= n
.its_variable
1474 if variable
!= null then
1475 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1480 redef fun name
do return once
"<".to_symbol
1483 redef fun name
do return once
"<=".to_symbol
1486 redef fun name
do return once
">".to_symbol
1489 redef fun name
do return once
">=".to_symbol
1491 redef class APlusExpr
1492 redef fun name
do return once
"+".to_symbol
1494 redef class AMinusExpr
1495 redef fun name
do return once
"-".to_symbol
1497 redef class AStarshipExpr
1498 redef fun name
do return once
"<=>".to_symbol
1500 redef class AStarExpr
1501 redef fun name
do return once
"*".to_symbol
1503 redef class ASlashExpr
1504 redef fun name
do return once
"/".to_symbol
1506 redef class APercentExpr
1507 redef fun name
do return once
"%".to_symbol
1510 redef class AUminusExpr
1511 redef fun name
do return once
"unary -".to_symbol
1512 redef fun compute_raw_arguments
do return null
1515 redef class ACallFormExpr
1516 redef fun after_typing
(v
)
1518 if n_expr
.is_implicit_self
then
1519 var name
= n_id
.to_symbol
1520 var variable
= v
.variable_ctx
[name
]
1521 if variable
!= null then
1523 if variable
isa ClosureVariable then
1524 n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1525 n
._variable
= variable
1527 if not n_args
.is_empty
then
1528 v
.error
(self, "Error: {name} is variable, not a function.")
1531 n
= variable_create
(variable
)
1532 n
._variable
= variable
1543 redef fun closure_defs
1545 if n_closure_defs
.is_empty
then
1548 return n_closure_defs
.to_a
1552 # Create a variable acces corresponding to the call form
1553 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1556 redef class ACallExpr
1557 redef fun variable_create
(variable
)
1559 return new AVarExpr.init_avarexpr
(n_id
)
1562 redef fun name
do return n_id
.to_symbol
1563 redef fun compute_raw_arguments
do return n_args
.to_a
1566 redef class ACallAssignExpr
1567 redef fun variable_create
(variable
)
1569 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1572 redef fun name
do return (n_id
.text
+ "=").to_symbol
1573 redef fun compute_raw_arguments
do
1574 var res
= n_args
.to_a
1580 redef class ACallReassignExpr
1581 redef fun variable_create
(variable
)
1583 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1586 redef fun name
do return n_id
.to_symbol
1587 redef fun compute_raw_arguments
do return n_args
.to_a
1590 redef class ABraExpr
1591 redef fun name
do return once
"[]".to_symbol
1592 redef fun compute_raw_arguments
do return n_args
.to_a
1593 redef fun closure_defs
1595 if n_closure_defs
.is_empty
then
1598 return n_closure_defs
.to_a
1603 redef class ABraAssignExpr
1604 redef fun name
do return once
"[]=".to_symbol
1605 redef fun compute_raw_arguments
do
1606 var res
= n_args
.to_a
1612 redef class ABraReassignExpr
1613 redef fun name
do return once
"[]".to_symbol
1614 redef fun compute_raw_arguments
do return n_args
.to_a
1617 redef class AInitExpr
1618 redef fun name
do return once
"init".to_symbol
1619 redef fun compute_raw_arguments
do return n_args
.to_a
1622 redef class AClosureCallExpr
1623 var _variable
: nullable ClosureVariable
1624 redef fun variable
do return _variable
.as(not null)
1625 redef fun compute_raw_arguments
do return n_args
.to_a
1627 redef fun after_typing
(v
)
1630 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1631 var sig
= va
.closure
.signature
1632 var s
= process_signature
(v
, sig
, n_id
.to_symbol
, compute_raw_arguments
)
1633 if not n_closure_defs
.is_empty
then
1634 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1636 if not s
then return
1637 _prop_signature
= sig
1638 _stype
= sig
.return_type
1643 redef class AClosureId
1644 fun to_symbol
: Symbol is abstract
1646 redef class ASimpleClosureId
1647 redef fun to_symbol
: Symbol do return n_id
.to_symbol
1649 redef class ABreakClosureId
1650 redef fun to_symbol
: Symbol do return n_kwbreak
.to_symbol
1653 redef class AClosureDef
1654 var _closure
: nullable MMClosure
1655 redef fun closure
do return _closure
.as(not null)
1657 # The corresponding escapable object
1658 readable var _escapable
: nullable EscapableBlock
1660 var _accept_typing2
: Bool = false
1661 redef fun accept_typing
(v
)
1663 # Typing is deferred, wait accept_typing2(v)
1664 if _accept_typing2
then super
1667 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure)
1671 var sig
= esc
.closure
.signature
1672 if sig
.arity
!= n_ids
.length
then
1673 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_ids.length} found.")
1677 _closure
= esc
.closure
1679 var old_var_ctx
= v
.variable_ctx
1680 var old_base_var_ctx
= v
.base_variable_ctx
1681 v
.base_variable_ctx
= v
.variable_ctx
1682 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1683 variables
= new Array[AutoVariable]
1684 for i
in [0..n_ids
.length
[ do
1685 var va
= new AutoVariable(n_ids
[i
].to_symbol
, n_ids
[i
])
1688 v
.variable_ctx
.add
(va
)
1691 _accept_typing2
= true
1694 if v
.variable_ctx
.unreash
== false then
1695 if closure
.signature
.return_type
!= null then
1696 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1697 else if closure
.is_break
and esc
.break_list
!= null then
1698 v
.error
(self, "Control error: Reached end of break block (a 'break' with a value was expected).")
1701 v
.variable_ctx
= old_var_ctx
1702 v
.base_variable_ctx
= old_base_var_ctx
1706 class ATypeCheckExpr
1708 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: AExpr, n_type
: AType)
1710 if not v
.check_expr
(n_expr
) then return
1711 if not n_type
.is_typed
then return
1712 var etype
= n_expr
.stype
1713 var ttype
= n_type
.stype
1714 if etype
== ttype
then
1715 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1716 else if etype
< ttype
then
1717 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1718 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1719 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1720 # No warning in this case since with
1721 # type T: nullable A
1723 # 'x.as(not null)' != 'x.as(T)'
1724 # 'x != null' != 'x isa T'
1725 else if self isa AIsaExpr then
1726 v
.warning
(self, "Warning: Prefer '!= null'.")
1728 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1734 redef class AIsaExpr
1735 special ATypeCheckExpr
1736 redef fun after_typing
(v
)
1738 check_expr_cast
(v
, n_expr
, n_type
)
1739 if not n_type
.is_typed
then return
1740 var variable
= n_expr
.its_variable
1741 if variable
!= null then
1742 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1744 _stype
= v
.type_bool
1749 redef class AAsCastExpr
1750 special ATypeCheckExpr
1751 redef fun after_typing
(v
)
1753 check_expr_cast
(v
, n_expr
, n_type
)
1754 if not n_type
.is_typed
then return
1755 _stype
= n_type
.stype
1756 _is_typed
= _stype
!= null
1760 redef class AAsNotnullExpr
1761 redef fun after_typing
(v
)
1763 if not v
.check_expr
(n_expr
) then return
1764 var t
= n_expr
.stype
1765 if t
isa MMTypeNone then
1766 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1768 else if not t
.is_nullable
then
1769 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1771 _stype
= n_expr
.stype
.as_notnull
1776 redef class AProxyExpr
1777 redef fun after_typing
(v
)
1779 if not n_expr
.is_typed
then return
1781 if n_expr
.is_statement
then return
1782 _stype
= n_expr
.stype
1786 redef class AOnceExpr
1787 redef fun accept_typing
(v
)
1789 if v
.once_count
> 0 then
1790 v
.warning
(self, "Useless once in a once expression.")
1792 v
.once_count
= v
.once_count
+ 1
1796 v
.once_count
= v
.once_count
- 1